Hot air blower

The utility model provides a hot air blower, it includes the organism, the organism left side is equipped with the switch board, the inside fan leaf that is equipped with of organism, fan leaf rear is equipped with the electrothermal tube, the electrothermal tube is spiral fin coil, and fan leaf the place ahead is equipped with the protection network, the protection network passes through shell and organism fixed connection, the organism lower extreme is equipped with the supporting legs of symmetry. The utility model discloses high -efficient, safety, longe -lived, it is fast to heat up, and the thermal conversion rate is high, it is energy -conserving durable.

Method for machining round-section polytetrafluoroethylene filament by virtue of cutting-hot melting shaping method

The invention discloses a method for machining a round-section polytetrafluoroethylene filament by virtue of a cutting-hot melting shaping method. The method comprises the following steps: mixing polytetrafluoroethylene dispersion resin powder with a liquid lubricant, and carrying out processes including material mixing, blank pressing, calendaring, longitudinal drawing, cutting, hot melting shaping and the like, thereby machining the polytetrafluoroethylene filament. The method is simple and is low in cost; the section of the prepared polytetrafluoroethylene filament is approximately round, the strength of the polytetrafluoroethylene filament is 4.3-3.2 cN/dtex, and the damage to the filament in acupuncture and spunlace machining processes can be greatly reduced; the filament can be widely applied to high-temperature tail gas treatment in waste incineration treatment plants, coal-fired power plants, industries of cement and the like and has remarkable economic and social benefits.

Modified starch using cyanuric chloride as linking radical and preparation method thereof

By means of utilizing cyanuric chloride in the shown structure as jointing radical, modified starch, including anionic modified starch, cationic modified starch and amphoteric modified starch, with different functional groups may be prepared. The production process of modified starch has less cross-linking and raised utilizing rate of modifier.

Silver-containing silicon-based mesoporous antibacterial agent and preparation method thereof

The invention discloses a silver-containing silicon-based mesoporous antibacterial agent and a preparation method thereof. The method comprises the following steps: mixing structure-directing agent of polyethylene glycol-polypropylene glycol-polyethylene glycol block copolymer, deionized water and acid, adding silicon source and silver source, then heating, continuously stirring to obtain sol-gel, drying sol-gel in vacuum, then washing with ethanol, drying in vacuum; and roasting the product of vacuum drying in protective gas. The antibacterial active silver is added during the preparation process of the mesoporous material, so that the silver ion can be deposited on the hole wall of mesoporous, then a physical or chemical method is used to remove the structure-directing agent of mesoporous and finally the silver-containing mesoporous inorganic antibacterial agent is prepared. The antibacterial agent is characterized in that the content of the antibacterial active body is easy to control ...

Oil tube high-temperature high pressure automatically cleaning device

The invention relates to a hyperthermia high-pressure based automatic cleaning device, comprising: an inner wall and outer wall cleaning system and a cleaning water control system, which are characterized in that the inner wall and outer wall cleaning system comprises a control stage (10), an upper tube rack (1), a transmission gear (8), an oil tube (7), a high-pressure self-rotating nozzle (9), a high-pressure water ring (14), and a lower tube rack (2); the PLC device of the control stage (10) controls the upper tube rack (1) to position the oil tube (10) to be cleaned onto the cleaning station; the PLC device of the control stage (10) control the transmission gear (8) to clean the oil tube (7) to be cleaned after the high-pressure water ring (14) and high-pressure self-rotating nozzle (9) are positioned onto the cleaning station; the cleaned oil tube (7) leaves the cleaning device through the lower tube rack (2); and a control system of the inner wall and outer wall cleaning device is ...

Boring rod embedded with carbon fibers

The invention discloses a boring rod embedded with carbon fibers. The boring rod consists of a main body and embedded strips, wherein the main body part of the boring rod is made of a single metal material, and the embedded strip is made of a carbon fiber material; the shape of the main body of the boring rod is similar to a spline shaft, and the boring rod is provided with a plurality of rectangular elongated slots with equal width and equal depth; and the shapes of the cross sections of all the embedded strips are rectangles, and the embedded strips are fixed in the elongated slots of the main body respectively through screws. The boring rod has the advantages of light weight, large bending strength, long service life and good vibration resistance and can better absorb the impact force, reduce the vibration in a boring process and guarantee the processing precision of holes, solve the problems of the traditional metal boring rod of heavy weight, low strength, poor stability for deep hole ...

Silver-containing silicon-based mesoporous antibacterial agent and preparation method thereof

The invention discloses a silver-containing silicon-based mesoporous antibacterial agent and a preparation method thereof. The method comprises the following steps: mixing structure-directing agent of polyethylene glycol-polypropylene glycol-polyethylene glycol block copolymer, deionized water and acid, adding silicon source and silver source, then heating, continuously stirring to obtain sol-gel, drying sol-gel in vacuum, then washing with ethanol, drying in vacuum; and roasting the product of vacuum drying in protective gas. The antibacterial active silver is added during the preparation process of the mesoporous material, so that the silver ion can be deposited on the hole wall of mesoporous, then a physical or chemical method is used to remove the structure-directing agent of mesoporous and finally the silver-containing mesoporous inorganic antibacterial agent is prepared. The antibacterial agent is characterized in that the content of the antibacterial active body is easy to control ...

A about band for inciting somebody to action restless patient's trick is fixed on bed fence horizontal pole

The utility model relates to an about band for inciting somebody to action restless patient's trick is fixed on bed fence horizontal pole, including the bandage, be provided with hasp and fixed band on the bandage, still include the inside lining that uses with the bandage cooperation, the inside lining is made by the cotton and is the list structure, and the both ends of inside lining are provided with and are used for being linked to be barrel form and then the detachable connections spare of cover in patient's trick with the inside lining, and the inside lining width is 2-3 times of the bandage width. Adopt the utility model discloses an about band for inciting somebody to action restless patient's trick is fixed on bed fence horizontal pole can effectively avoid causing the injury of doctor source nature to the patient, and simple structure, the extend use of being convenient for.

Road speed humps for reducing bumpiness for driver and passengers

The invention provides road speed humps for reducing bumpiness for a driver and passengers. The speed humps are formed by combining a plurality of speed reducing block units; the cross sections of the speed reducing block units in a width direction and a height direction are approximately trapezoidal; and the top of each speed reducing block unit is a plane and sloping surfaces on both sides of the speed reducing block unit are quintic polynomial curved surfaces. A slow-down vehicle can smoothly run over the speed humps without jumping, and the driver and the passengers in the vehicle can be free from shaking and bumping and feel comfortable. A vehicle which does not slow down is subjected to great bumpiness while running over the speed humps. The road speed humps have the advantages of reducing the effect of collision impact between conventional speed humps and a vehicle on the vehicle, the driver and the passengers, ensuring road traffic safety, improving the driving comfort of a low-speed ...

Device for biaxially-oriented stretching polytetrafluoroethylene hollow fiber membranes and method thereof

The present disclosure discloses a device for biaxially-oriented stretching polytetrafluoroethylene hollow fiber membranes and the method thereof. The device may include a lubricant removing oven and a tube blank heating oven mounted at the outlet end of the push-compression mold, a core extension extending from the core into the lubricant removing oven and the tube blank heating oven, and a speed regulating guide wheel mounted at the outlet of the tube blank heating oven. A tube blank is extruded from a push-compression machine, inserted on the core extension for removal of lubricant in the lubricant removing oven, heated in the tube blank heating oven, transversely stretched by means of the bulked core, and then wound onto the speed regulating guide wheel for longitudinal stretching. Both transverse and longitudinal stretching can be realized for polytetrafluoroethylene tube blanks, overcoming disadvantages of traditional processing devices that can merely perform longitudinal stretching ...

Compound type uvioresistant antibacterial agent and preparation method thereof

Biological 3D prints three way connection of rifle

The utility model relates to a biological 3D prints three way connection of rifle, three way connection are the heptahedron, and parallel from top to bottom top surface and bottom surface are drawn together to three way connection's seven bread, and top surface and bottom surface are rectangle, and the front and back of top surface and bottom surface is connected to the front and back, and areas such as front and back are special shaped structure, lateral binding top surface and bottom surface be first side, second side and third side, first side is the rectangle, the second side is the rectangle, the third side is the cambered surface that has the indent radian, three way connection's three opening is material inlet, light source entry and injection needle entry respectively, communicatethree opening for first passageway and second channel, three way connection adopts the back solidification formula of beating earlier or solidifies the formula structure while beating, first passageway ...

Seawater retting and low alkali combined degumming method for hemp

Preparation method of metal tantalum belt

The invention relates to a preparation method of metal tantalum belts. The method is characterized in that the preparation method comprises the following steps: adopting high purity smelted tantalum ingots to forge tantalum metal slabs; then rolling, annealing the rolled blanks; welding the annealed blanks and a leading tape by adopting argon arc protective welding, and then performing tension rolling to prepare tantalum belts, wherein in the rolling process, the first pass adopts 35% or more of processing rate, the second pass adopts 30% or more of processing rate and the following passess adopt 15% or more of processing rate. The invention adopts high purity smelted tantalum ingots to perform forging and deformation so as to refine original coarse grains of blanks; the method adopts mechanical milling and chemical acid cleaning to clean blanks, combines large processing rate rolling technology in the early stage of rolling to fully refine the grains of the finished belts and finallyadopts ...

Preparation method of composite polytetrafluoroethylene nano-filtration membrane

The invention discloses a preparation method of a composite polytetrafluoroethylene nano-filtration membrane. After a hydrophobic polytetrafluoroethylene micro-pore membrane is activated, the composite polytetrafluoroethylene nano-filtration membrane is obtained by virtue of water-phase soaking and oil-phase soaking. The polytetrafluoroethylene micro-pore membrane has the characteristics that the strength is high and an additional supporting layer is not needed, and thus the membrane preparation process is relatively simple. Furthermore, by virtue of a unique node-fibril micropore structure of the polytetrafluoroethylene micro-pore membrane, the bonding strength between a base membrane and a nano-filtration modified layer is greatly improved, so that the performance of the composite nano-filtration membrane is improved. The prepared composite polytetrafluoroethylene nano-filtration membrane can be used for treating wastewater in severe environments of strong acid, strong alkali, high temperature ...

Convenient sedan cover

The invention provides a sedan cover with the advantages of sun protection, heat insulation, frost prevention, heat preservation, and convenient use. The sedan cover adopts the technical scheme that the shape of the sedan cover is similar to that of the upper part of the sedan, so the cover only covers the top part and peripheral glasses of the sedan; the inner surfaces of the front part, the back part, and the top part of the sedan cover are provided with a set of support blocks; the front part, the back part, and the bottom sides of the left side and the right side of the sedan cover are provided with a set of magnet blocks absorbing the cover surface onto the sedan body surface; and lateral sides of the sedan cover are provided with nylon fasteners connected with the left and the right rearview mirror handles and door handles of the front part of the sedan respectively. By adopting a silver coated nylon cloth, or an aluminized film with high reflection ratio, a polyester fiber rain-proof ...

Duct insert heater

The utility model provides a duct insert heater, it is including the outside wind channel body that is equipped with the cotton layer of aluminium silicate, the protection box is connected to wind channel body upper end, the body inside left and right sides that is equipped with a plurality of U type heating element wind channels body in wind channel is equipped with the import and the export of intercommunication, the outside of export is equipped with the thermo detector. The utility model discloses intensification cooling rate is fast, and mechanical properties is good, and heating efficiency is high, is fit for automatic control, has prolonged life.

Inorganic nanometer-sized mesoporous antibacterial agent and preparation method thereof

The invention discloses an inorganic nanometer-sized mesoporous antibacterial agent and a preparation method thereof. The preparation method comprises: agitating a polyethylene glycol-polypropylene glycol-polyethylene glycol block copolymer, deionized water and an acid together, adding a silicon source, a calcium source and a phosphorus source to obtain a sol-gel liquid, drying and sintering to obtain an inorganic nanometer-sized mesoporous material, carrying out amino or mercapto graft modification to obtain a modified inorganic nanometer-sized mesoporous material, adding the modified inorganic nanometer-sized mesoporous material to the deionized water or ethanol, dripping a silver nitrate solution, loading sliver and putting to a formaldehyde deionized water solution so that the sliver ions are reduced to a simple substance sliver, filtering, washing and drying. The loaded sliver is converted into the simple substance sliver through a strong reduction system, due to the graft modification ...

High alumina ceramic and its producing process

A certain amount of diopside and kaolin is introduced into the formula of CaO-MgO-Al2O3-SiO2 ceramic material whose Al2O3 content is 85 Wt.% and the ceramic material may be dense-sintered under 1420 deg.C. If the content of diopside and kaolin is optimal, its low-temp. sinter performance will be better.

Method for increasing deep color stability of hemp cloth

The invention discloses a method for increasing the color fastness of dark dye of hemp fabrics. Firstly, the hemp fabrics are washed with sodium hydroxide prior to dyeing; then the washed hemp fabrics are treated with pectinase in an enzymolysis tank and sequentially dyed; the dyeing liquid is removed and the dyed fabrics are washed with a mixture of water and soaping agent until the washing liquid is clear; and finally the fabrics are dehydrated and dried. In this invention, the hemp fabrics are treated with pectinase prior to high-temperature high-pressure dyeing, so as to appropriately reduce the crystallization degree of hemp fabrics while further dissolving colloid substances, thereby facilitating the attachment of dye to the hemp fabric. Simultaneously the fibers are loosened after the treatment with pectinase, so that the dyed hemp fabrics have bright color, soft hand touch and high color fastness. The hemp fabrics dyed by this method is superior in that the color fastness to soaping ...

Road decelerating ridge without rigid shock and flexible shock

The invention provides a road decelerating ridge without rigid shock and flexible shock for vehicles. The decelerating ridge comprises a plurality of decelerating block units, section forms of the decelerating block unit in the width and the height directions approach trapezoid, the top of the decelerating block unit is a plane and both side slopes are sine curved surfaces, which ensures that the vehicles are suffered neither violent rigid shock nor flexible shock when passing through the decelerating ridge and minimizes the damage of the shock to the vehicles and the decelerating ridge. A driver can placidly drive across the decelerating ridge as long as the driver actively decreases the speed of the vehicle and people and cargoes on the vehicle can be suffered lighter shock. When a high-speed vehicle passes through the decelerating ridge, huge jolts are about to emerge and make people uncomfortable. The invention solves the problems of neighboring environment oscillation, noise pollution ...

Calculation method of minimum tooth number of flexible gear of harmonic gear mechanism

The invention relates to a calculation method of the minimum tooth number of a flexible gear of a harmonic gear mechanism in order to resolve the problem that when a harmonic gear mechanism is designed in the prior art, the determining basis of the minimum tooth number of the flexible gear is not reasonable enough. The calculation method includes the following steps that (1) according to the work condition requirements, the work safety coefficient allowable value of the flexible gear is set; (2) the materials and heat treatment method of the flexible gear are selected; (3) the elasticity modulus and bending fatigue limit of the materials of the flexible gear are searched; (4) the tooth number difference of a rigid wheel and the flexible gear is made; (5) the minimum allowable value of the tooth number of the flexible gear is calculated; (6) the minimum tooth number of the flexible gear is determined.

Seawater retting and low alkali combined degum method for hemp

The present invention discloses a hemp sea-water retting and low-alkali combined degumming method. It is characterized by that firstly, it utilizes sea-water to ret hemp, then adopts normal-temperature and normal-pressure low-alkali to make the hemp fiber undergo the process of degummming treatment. Its technological process includes the following steps: washing hemp by using sea-water, retting hemp by using sea-water, rinsing hemp, low-alkali degumming, washing by using water, dewatering, shaking, softening, de-oiling, drying so as to obtain the refined hemp.

Method for preparing niobium sheet metal strip

Pipe heater

The utility model provides a pipe heater, it includes the barrel, the left and right sides of barrel top is equipped with export and import, and the barrel below is equipped with the support, and the barrel outside is equipped with heat preservation cotton layer, and the barrel right -hand member seals, and the left end passes through the flange to be connected with the protection box, simplified inside is equipped with heating pipe and guide plate, be equipped with first point for measuring temperature on the protection box, be equipped with the second point for measuring temperature in the export, the barrel below still is equipped with the drain. The utility model discloses heat time is short, controls the convenience, and is efficient, has practiced thrift the energy.

Road speed bump with soft vibration

The invention provides a road speed bump with soft vibration, which is formed by combining a plurality of decelerating blocks. The shape of the cross section of each decelerating block in a direction of width and height is similar to a trapezoid; the top of the cross section is a section of straight line, and both sides of the cross section consist of a section of constant acceleration parabola and a section of uniform deceleration parabola; and curvature directions of the constant acceleration parabola and the uniform deceleration parabola on the same side are reverse. The road speed bump with soft vibration is characterized in that low-speed vehicles can pass through the speed bump slowly in a mode of soft vibration to ensure the riding comfort of passengers and the perfect condition of loaded cargos; when passing through the speed bump, high-speed vehicles are subjected to flexible impact, and the size of impact force is proportional to the square of vehicle speed, namely the vehicle ...

White printing paste, preparation method and application of white printing paste

The invention discloses white printing paste, a preparation method and application of white printing paste. The white printing paste comprises the following components in parts by weight: 1 to 20 parts of white pigment, 2 to 5 parts of a thickening agent, 5 to 30 parts of an adhesive, 0.1 to 2 parts of a dispersing agent, and 43 to 91.9 parts of deionized water. The preparation method comprises the following steps: adding the dispersing agent and white pigment to deionized water under normal temperature; oscillating to uniformly disperse the pigment; then adding the thickening agent and the adhesive; agitating to obtain white printing paste; uniformly printing the white printing paste to a base fabric through a screen printing machine; preliminarily drying and then drying again; and then performing standard water washing to obtain snow pretending protective fabrics. According to the white printing paste and the preparation method, the printing technique is simple, the process is short; ...

Preparation method of silver-loaded mesoporous silicon dioxide antibacterial agent

The invention discloses a preparation method of a silver-loaded mesoporous silicon dioxide antibacterial agent. The preparation method disclosed by the invention comprises the following steps: dissolving a template agent, a silicon source and silver nitrate in water to obtain a silver sol solution, adding a chloride aqueous solution into the silver sol solution, stirring and mixing to form silicon dioxide/silver chloride gel, drying gel, and carrying out thermal treatment to obtain the mesoporous silicon dioxide antibacterial agent containing elemental silver. The prepared silver-loaded mesoporous silicon dioxide antibacterial agent is 200-1000 cm<2>/g in specific surface area, 5-30 nm in aperture and 1.0-5.0 cm<3>/g in pore volume; the mass percentage of elemental silver is 10-30%. The antibacterial agent prepared by the preparation method disclosed by the invention keeps the ordered porous structure, the uniform aperture, the larger specific surface area and the pore volume of the carrier ...

Anus send medicine ware

The utility model relates to an anus send medicine ware, including outer tube and movable the setting in the inside push rod of outer tube, push rod's top is provided with and opens, closed medicine parcel member, and the medicine just can be released push rod's promotion push -down play outer tube and automatic opening to the setting that medicine parcel member is the closure state inside the outer tube. The utility model relates to an anus send medicine ware has convenient operation, sanitation and hygiene, send the drug effect rate high advantage.

Silicon-zinc nano mesoporous inorganic antibacterial and preparation method thereof

The invention discloses a silicon-zinc nano mesoporous inorganic antibacterial and a preparation method thereof. The preparation method comprises the following steps: stirring polyethylene glycol-polypropylene glycol-polyethylene glycol triblock copolymer, deionized water and acid together, adding a silicone source, a zinc source and a copper source, and heating to continuously stir to obtain sol-gel solution; and drying and sintering the sol-gel to obtain the silicon-zinc mesoporous material. The silicon-zinc nano mesoporous inorganic antibacterial consists of silicon dioxide and zinc oxide, and can also be added with copper oxide, wherein the silicon dioxide serves as a network support for the antibacterial; and the zinc oxide and the copper oxide serve as active bodies of the antibacterial; and mesopores prepared by the method have an ordered structure. The antibacterial has the characteristics of simple preparation method, strong bacteria resistance, durable antibacterial effect, stable ...

A Device for Biaxially-Oriented Stretching Polytetrafluoroethylene Hollow Fiber Membranes and Method Thereof

The present disclosure discloses a device for biaxially-oriented stretching polytetrafluoroethylene hollow fiber membranes and the method thereof. The device may include a lubricant removing oven and a tube blank heating oven mounted at the outlet end of the push-compression mould, a core extension extending from the core into the lubricant removing oven and the tube blank heating oven, and a speed regulating guide wheel mounted at the outlet of the tube blank heating oven. A tube blank is extruded from a push-compression machine, inserted on the core extension for removal of lubricant in the lubricant removing oven, heated in the tube blank heating oven, transversely stretched by means of the bulked core, and then wound onto the speed regulating guide wheel for longitudinal stretching. Both transverse and longitudinal stretching can be realized for polytetrafluoroethylene tube blanks, overcoming disadvantages of traditional processing devices that can merely perform longitudinal stretching. 1. A device for biaxially-oriented stretching polytetrafluoroethylene hollow fiber membranes , wherein the device comprising:a lubricant removing oven and an tube blank heating oven that are mounted in turn at an outlet end of a compression mould;a core extension linearly extending from a core of the compression mould into the lubricant removing oven and the tube blank heating oven, the core extension in the tube blank heating oven increasing in diameter such as to form a bulk core for traverse stretching; anda speed regulating guide wheel mounted at the outlet of the tube blank heating oven, the speed regulating guide wheel designed for longitudinal stretching and positioned under a bottom of the core extension.2. The device of claim 1 , wherein a tube blank is extruded from a push-compression machine claim 1 , inserted on the core extension for removal of lubricant in the lubricant removing oven claim 1 , heated in the tube blank heating oven claim 1 , and transversely ...

Bidirectional drawing device and bidirectional drawing method for hollow polytetrafluoroethylene fiber membrane

The invention discloses a bidirectional drawing device and a bidirectional drawing method for a hollow polytetrafluoroethylene fiber membrane. The bidirectional drawing device for the hollow polytetrafluoroethylene fiber membrane comprises a degreasing oven, a tube blank heating oven, a core die extending section and a speed regulating guide wheel, wherein the degreasing oven and the tube blank heating oven are mounted at the outlet of a pushing and pressing die; the core die extending section extends out of a core die and extends to the degreasing oven and the tube blank heating oven; the diameter of the core die extending section in the tube blank heating oven is expanded to form an expansion core die; the speed regulating guide wheel used for longitudinally drawing is mounted at the outlet of the tube blank heating oven and positioned below the bottom of the core die extending section. A tube blank is extruded by a pushing and pressing machine, arranged on the core die extending section ...

Method for preparing waterproof moisture-permeable coated fabric

The invention discloses a method for preparing a waterproof moisture-permeable coated fabric. The moisture permeability of a polyurethane coated fabric is improved by adding modified cellulose powder which accounts for 5 to 50 percent of the weight of polyurethane and is modified by a silane coupling agent into a polyurethane coating agent, and the waterproof property of the polyurethane is improved by adding inorganic powder which accounts for 0.5 to 5 percent of the weight of the polyurethane and is modified by the silane coupling agent, wherein the silane coupling agent accounts for 0.5 to1 percent of the weight of the modified cellulose powder; and the silane coupling agent accounts for 0.5 to 1 percent of the weight of the inorganic powder. The modified polyurethane which accounts for 15 to 50 percent of the weight of a base fabric is coated on the base fabric of a knitted fabric, a woven fabric or a non-woven fabric to prepare the waterproof moisture-permeable coated fabric with good ...

Preparation method of alizarin enhanced silk fibroin antibacterial hemostatic composite fiber membrane

The invention discloses a preparation method of an alizarin enhanced silk fibroin antibacterial hemostatic composite fiber membrane. The preparation method comprises the following steps: (1) preparing a spinning solution formed by blending silk fibroin and alizarin according to a certain mass ratio; (2) performing electrostatic spinning on the mixed spinning solution to obtain a composite fiber membrane, and performing post-treatment on the prepared membrane to obtain the silk fibroin/alizarin antibacterial hemostatic composite fiber membrane. Compared with the prior art, alizarin serves as a reinforcing material and is added into a silk fibroin matrix, the silk fibroin/alizarin antibacterial and hemostatic composite fiber membrane is prepared through electrostatic spinning, and the antibacterial performance and hemostatic performance of a pure silk fibroin material are improved.

Compound type uvioresistant antibacterial agent and preparation method thereof

The invention discloses a compound type uvioresistant antibacterial agent and a preparation method thereof. The preparation method for the compound type uvioresistant antibacterial agent comprises the following steps of: firstly, coarsening talc powder by adopting fluohydric acid; secondly, sensitizing the talc powder after coarsening; and finally, performing silver deposition reaction on the talc powder after sensitizing. Metallic state silver of which the weight is 5 to 10 percent of that of the talc powder and the thickness is 50 to 100 nanometers is deposited and coated on the surface of the talc powder. By using the ultraviolet shielding, absorbing and bacteriostatic functions of nano-state metallic silver, the preparation method prepares the compound type uvioresistant antibacterialagent which simultaneous has uvioresistant and antibacterial functions by depositing the nano silver on the surface of the talc powder. The compound type uvioresistant antibacterial agent has the advantages ...

Exhaust device for elevator furnace system

The invention discloses an exhaust device for an elevator furnace system. The elevator furnace system comprises M elevator furnaces. The exhaust device comprises M branch exhaust pipelines and one main exhaust pipeline, wherein the air inlet ends of the M branch exhaust pipelines are connected to the air outlets of the M elevator furnaces respectively; the air outlet ends of the M branch exhaust pipelines are connected to the main exhaust pipeline respectively; the main exhaust pipeline passes through a wall surface, and is fixed on the wall surface through a fastening mechanism; along an exhaust direction from the air inlet ends of the branch exhaust pipelines to the air outlet ends, a safety pneumatic pressure-reducing valve, an electromagnetic pneumatic valve and an exhaust fan are arranged in sequence on each branch exhaust pipeline; the outlets of the safety pneumatic pressure-reducing valves are directly communicated with the outside; first manual valves are arranged on the branch ...

Preparation method of silver-copper oxide co-doped mesoporous zirconium dioxide antibacterial agent

The invention discloses a preparation method of a silver-copper oxide co-doped mesoporous zirconium dioxide antibacterial agent. The preparation method comprises the following steps: dissolving a template agent, a lower alcohol, a zirconium source and a stabilizing agent in water to form a zirconium precursor solution; dropwise adding a silver nitrate aqueous solution and a zinc chloride aqueous solution to the zirconium precursor solution in the stirring process and mixing the solutions to form gel; and carrying out radiation treatment on the gel under a light source after drying the gel and then carrying out high temperature treatment, thus obtaining the silver-copper oxide co-doped mesoporous zirconium dioxide antibacterial agent. The antibacterial agent takes mesoporous zirconium dioxide as a network supporting body and elemental silver and copper oxide as active centers and has elemental silver content of 21-25%, copper oxide content of 11-15% and zirconium dioxide content of 60-68% ...

Electrostatic powder spraying device

The utility model discloses an electrostatic powder spraying device, including the assembly line that is used for carrying the work piece, the assembly line extends to to carry in the spraying bucket and with the work piece and so far carries out the spraying, be provided with a plurality of paint gun heads, every on the interior bucket wall of spraying bucket the paint gun head is used for the powder coating of the different colors of spraying, every the paint gun head links to each other with the paint gun body that sets up outside the spraying bucket, the paint gun body and function is in the powder coating that absorbs different colors and carry to the paint gun overheadly, still be provided with the colour recognizer that is used for discerning the colour label on the work piece on the assembly line, the colour recognizer is connected with the microprocessor electricity, microprocessor is used for controlling the powder that different colors were absorb to the paint gun body. The utility ...

Zinc oxide linear resistance medium and its preparation method

The invented linear resistance medium of zine oxide and its preparation method includes following steps. With the weight constituent: zinc oxide 60-90%, magnesia 1-10%, alumina 1-20%, multielement additive 3-15% of 3-4 classes among titanium oxide, calcium oxide, mullite and spinel being mixed and ball milled, the granules are made by spraying and isostatic compaction. Then, after the granules being burned in the electrothermal tunnel kiln at 1250-1350 deg.C, the ceramics resistance medium is made. The ceramics resistance medium possesses the following characters: resistivity 1-10 to the power 4 ohm.cm, resistance power 800 joule/cm3, resistance temperature coefficient 1x10 to the power -3 ohm/deg etc. The invented medium can be widely used as the switch or resistor, the grounding resistor, the absorbing resistor and the power termination resistor.

High-speed impact resistance composite material

The invention discloses a high-speed impact resistance composite material. An impact surface facing layer, a middle core layer and an impact surface backing layer form a sandwich composite material structure, the core layer consists of microporous materials, the impact surface facing layer and the impact surface backing layer of the sandwich structure composite material are respectively formed by laminating at least four layers of inorganic fiber layers and organic fiber layers, the resin mass content of the inorganic fiber layers is 10 to 40 percent, the inorganic fiber layers need to be near the impact surface facing layer, and the impact surface facing layer, the impact surface backing layer and the core layer are bonded through adhesives. The high-speed impact resistance composite material has the advantages that dynamical anisotropy differences of various high-performance fibers are utilized, and an interlayer hybrid mode is adopted for preparing a surface layer composite material, ...

Preparation method of immobilized all-anthropogenic ECM coating matrix

The invention relates to a preparation method of an immobilized all-anthropogenic ECM coating matrix, first, extracellular matrix can be obtained from human umbilical cord mesenchymal cells by cell lysis method, and finally the extracellular matrix is immobilized by methanol. The matrix is an immobilized extracellular matrix which is all-anthropogenic and ready-to-use, can be saved for a long time and is suitable for long-term culture growth of human embryonic stem cells, and can be used for in vitro amplification of clinical grade human embryonic stem cells.

Protection against electric shock safety terminal box

The utility model discloses a protection against electric shock safety terminal box has: box body (1), wherein, box body (1) upper portion is equipped with electrical neutral zone (11), and box body (1) lower part is equipped with electrified district (12), the cover is in upper cover (2) of electrical neutral zone (11), the cover is in lower cover (3) of electrified district (12), and wherein, upper cover (2) and lower cover (3) are articulated, and open or closed electrical neutral zone (11) or electrified district (12) accessible upper cover (2) or lower cover (3), upper and lower upset mode through upper cover (2) and lower cover (3) with the electrified regional of terminal box with does not take some regions and separate, prevented the emergence of electric shock.

Solid supported type metal schiff base catalyst and preparation method thereof

The invention discloses Schiff base ligand compounds with a structural formula shown in a formula (I). In the formula, R1 is a hydrogen atom, a chlorine atom or a tert-butyl group; and R2 is the hydrogen atom, the chlorine atom or the tert-butyl group. The invention also discloses an immobilized catalyst which is prepared from the Schiff base ligand compounds and is used for series catalysis of oxygenated hydrocarbons by molecular oxygen. The immobilized catalyst for catalyzing the oxygenated hydrocarbons by the molecular oxygen has large immobilization amount of metal ions and high catalytic activity, and can be used for industrialized production. A method of the invention is easy to obtain raw materials, has simple preparation technology, and is easy for mass production.

Environment-friendly asymmetric synthetic method of (R)-phenyl ethylene glycol

The invention discloses an environment-friendly asymmetric synthetic method of (R)-phenyl ethylene glycol and belongs to the technical field of asymmetric synthesis. By taking styrene as a raw material, optically pure (R)-phenyl ethylene glycol is prepared by direct catalytic oxidization. The (R)-phenyl ethylene glycol has a relatively high atom economy. Moreover, by taking a low-toxicity harmless phosphotungstic chiral ionic liquid as a catalyst and H2O2 as a green oxidizing agent, the yield of the (R)-phenyl ethylene glycol is 67-82% and the enantiomeric purity is 96-100%e. e. After reaction, the catalyst is easily separated from byproducts, and the recovered catalyst precipitate can be recycled. The method disclosed by the invention is simple in process, high in production efficiency, low in cost and small in environmental risk and meets the requirements of environment-friendly chemical industry.

Charging equipment of steel pipe bending machine

The utility model discloses a charging equipment of steel pipe bending machine, which comprises a frame, install in the frame and be used for the lifting mechanism of steel pipe from lower lifting to eminence, one side of lifting mechanism is provided with and is used for receiving the collection platform that rolls the steel pipe that falls from lifting mechanism, one side that lifting mechanism was kept away from to the collection platform is provided with the rolling baffle of hindrance steel pipe, but collect the below of platform be provided with the up -and -down motion be used for stir the steel pipe to the plectrum of opposite side from one side of baffle, the plectrum is provided with towards the arc recess of baffle, the baffle is kept away from the one side of collecting the platform and is provided with a pair of roller. The utility model discloses a structure setting accords with big batch pipelining, and rotational speed through adjustment cam can be so that the control process ...

Electrical heating heat conduction oil furnace

The utility model provides an electrical heating heat conduction oil furnace, it includes the inner tube, the right side of inner tube is equipped with the oil inlet, is equipped with oil -out and sample connection on the left of the inner tube, inner tube bottom is supported through the support of two symmetries, is equipped with left drain and right drain on the inner tube between two supports, still be equipped with the discharge gate on the drain of the right side, the surface of inner tube is equipped with in proper order from inside to outside and presss from both sides cover, heat preservation and shell. The utility model discloses the installation maintenance is simple and convenient, energy -concerving and environment -protective, and heating efficiency is high, and intensification cooling speed is fast, has prolonged life.

Catalyst for catalyzing dehydrogenation of 1, 4-butanediol to prepare gamma-butyrolactone as well as preparation method and application of catalyst

The invention discloses a catalyst for catalyzing dehydrogenation of 1, 4-butanediol to prepare gamma-butyrolactone, and the catalyst consists of an active component, an auxiliary agent and a carrier, the content of the active component is 3-8% by weight of the carrier, and the content of the auxiliary agent is 0.5-3% by weight of the carrier; the active component is Ag, and the auxiliary agent is at least one of K and La; the carrier is a mixture of a carbon carrier and a metal oxide carrier; the metal oxide carrier is any one of MgO, CaO, MnO and CeO2. Meanwhile, the invention also discloses a preparation method and application of the catalyst. The catalyst provided by the invention is simple in preparation method, environment-friendly and non-toxic in preparation process, and high in raw material conversion rate, high in target product selectivity and high in catalytic activity when being used for preparing gamma-butyrolactone through butanediol dehydrogenation.

Method for preparing HNS-II by recrystallization in nitric acid

The invention relates to the technical field of preparation of energetic compounds and specifically relates to a method for preparing HNS-II by recrystallization in nitric acid. The method comprises the following steps: preparing a crystallization starting solution; adding HNS-I into the starting solution, and stirring to obtain a mixed solution; heating the mixed solution to increase the temperature to the preset temperature, and keeping the constant temperature to realize full dissolution or partial dissolution of HNS-I so as to obtain a lysate; cooling the lysate obtained by fully dissolving HNS-I at a preset rate to a crystallization point, then performing crystal growing at the constant temperature for a preset period of time, and then cooling to room temperature at the preset rate; or directly cooling the lysate obtained by partially dissolving HNS-I at the preset rate to room temperature to obtain a crystallization solution; filtering the obtained crystallization solution to obtain ...

Copolymerized flame-retardant polyamide 66 and preparation method thereof

The invention discloses copolymerized flame-retardant polyamide 66 and a preparation method thereof. The preparation method comprises the following steps: firstly, adding an aqueous solution of polyamide 66 salt into a high-pressure reaction kettle for pre-concentration, then slowly adding flame retardant salt into a reaction system in a post-charging manner, discharging, cooling and pelletizing after a condensation polymerization reaction is completed to obtain the copolymerized flame-retardant polyamide 66, and the flame retardant salt is prepared by a salifying reaction of DOPO, itaconic acid and barium hydroxide Ba (OH) 2. The preparation method disclosed by the invention is simple to operate, and the prepared product has the advantages of large molecular weight, excellent flame retardance, long flame retardant time, good mechanical property and the like.

(20S,25R)-dammar-20,25-epoxy-3beta,12beta,26,24beta-tetrol and extracting method and medical applications thereof

The invention relates to (20S,25R)-dammar-20,25-epoxy-3beta,12beta,26,24beta-tetrol and an extracting method and medical applications thereof and belongs to the field of medicines. The extracting method includes: smashing red ginseng, adding ethanol having a concentration of 80-90% the volume of which is 3-5 times of the volume of the red ginseng, heating, performing reflux extraction for 3-5 times with each time of the reflux extraction being performed for 2-4 h, combining extraction liquids, recovering the solvent until the extraction product is dry, adding the obtained extraction product to D101 macroporous adsorption resin, washing with water first, eluting with ethanol having a concentration of 85%, collecting ethanol eluate, recovering the solvent in the ethanol eluate until the ethanol eluate is dry, subjecting the obtained extraction product to three times of column chromatography on silica gel with the particle size of the silica gel being 200-400 meshes and an eluant being a mixture ...

Inorganic nanometer-sized mesoporous antibacterial agent and preparation method thereof

The invention discloses an inorganic nanometer-sized mesoporous antibacterial agent and a preparation method thereof. The preparation method comprises: agitating a polyethylene glycol-polypropylene glycol-polyethylene glycol block copolymer, deionized water and an acid together, adding a silicon source, a calcium source and a phosphorus source to obtain a sol-gel liquid, drying and sintering to obtain an inorganic nanometer-sized mesoporous material, carrying out amino or mercapto graft modification to obtain a modified inorganic nanometer-sized mesoporous material, adding the modified inorganic nanometer-sized mesoporous material to the deionized water or ethanol, dripping a silver nitrate solution, loading sliver and putting to a formaldehyde deionized water solution so that the sliver ions are reduced to a simple substance sliver, filtering, washing and drying. The loaded sliver is converted into the simple substance sliver through a strong reduction system, due to the graft modification ...

Method for processing rack with epicycloidal tooth trace

The invention provides a method for processing a rack with an epicycloidal tooth trace, which comprises the following steps: a cutter head is installed on a moving tool carriage, wherein the cutter head is in a two-layer structure, the inner cutter head on the upper layer is provided with inner cutters, the outer cutter head on the lower layer is provided with outer cutters, the inner cutter head and the outer cutter head are connected by a cross slide coupling, and the inner cutters and the outer cutters are installed at intervals in the circumferential direction, so that the axial lines of the inner cutters and the outer cutters do not coincide and the cutter head moves along with the tool carriage while rotating around the axial line; the position of the scale mark of a rack blank corresponds to that of the cutter head, and the speed of the rack blank is equal to that of the tool carriage; relative to the tool carriage, the cutter head perform pure rolling arround a generating circle ...

Preparation method of chitosan-loaded fibroin-based antibacterial hemostatic material

The invention discloses a preparation method of a chitosan-loaded fibroin-based antibacterial hemostatic material, which comprises the following steps: respectively preparing a silk fibroin solution and a chitosan solution, and uniformly mixing according to a certain mass ratio to obtain a spinning solution; preparing a fiber membrane by an electrostatic spinning method, and performing post-treatment on the prepared membrane to obtain the chitosan-loaded fibroin-based antibacterial hemostatic material. Chitosan and silk fibroin are used as spinning raw materials to be mixed to obtain a spinning solution, electrostatic spinning condition parameters are regulated and controlled to prepare a chitosan-loaded silk fibroin composite fiber membrane, then the fiber membrane is subjected to aftertreatment, and the chitosan-loaded silk fibroin-based antibacterial hemostatic material is obtained. The preparation method is simple and easy to implement, process conditions are easy to realize, and the ...

Gemini surfactant containing triazine ring

Disclosed is a Gemini surface active agent as indicated in a general formula (I), the surface active agent has a molecular structure taking a triazine ring as a linking group and possesses rather high stability, and the critical surface tension thereof is far weaker than that of the common surface active agent, the critical micelle concentration is lower than that of the common surface active agent by 2 to 3 orders of magnitude, and the surface activity is excellent.

Pirate prevention door body structure

A pirate prevention door body structure comprises a pair of interlayer plates, filling layers and cage type plate spring shock resistance structures, wherein the pair of interlayer plates are arranged in parallel, skins surround the outer walls of the interlayer plates, the hollow positions of the pair of interlayer plates are filled with the filling layers, and the cage type plate spring shock resistance structures are arranged between the pair of interlayer plates. The pirate prevention door body structure is simple in structure, good in buffer and vibration reducing performance, firm and durable.

Nine-five aluminium oxide ceramic with low sintering temp.

This invention relates to CaO-MgO-Al2O3-SiO2 system 95 aluminium oxide ceramics, which is used for producing porcelain insulator or high temperature structural porcelain element. Its technical matter is adding diopside 5.5-9.5 wt%, or tremolite 5-10 wt% into 90wt%>alpha-Al2O3, this two group porcelain material is sintered for densification. Electro-mechanical properties of said products are not second to traditional 95 porcelain. It is energy saving and has low cost.

Silicon-zinc mesoporous material silver-carrying antibacterial agent and preparation method thereof

The invention discloses a silicon-zinc mesoporous material silver-carrying antibacterial agent and a preparation method thereof. The preparation method comprises: stirring a polyethylene glycol-polypropylene glycol-poly(ethylene glycol) (PLA-PEG)block copolymer, deionized water and an acid, adding a silicon source and a zinc source to obtain sol-gel liquid, and sintering the sol-gel liquid to obtain the silicon-zinc mesoporous material; adding the obtained inorganic nano mesoporous material into deionized water or ethanol, adding solution of silver nitrate and drying the mesoporous material; and adding the silver-carrying mesoporous material into the deionized water solution of formaldehyde to perform a reaction, filtering the solution, and washing and drying the resulting product; or roasting the silver-carrying mesoporous material in a protective atmosphere to prepare the silver-carrying silicon-zinc mesoporous material antibacterial agent. The method is simple in preparation; as zinc ...

Gear with epicycloid-shaped tooth trace

The invention discloses a gear with an epicycloid-shaped tooth trace, all the intersecting lines of the wheel teeth of the gear with a reference cylinder, a root cylinder and a tip cylinder thereof are prolate epicycloids, and all the intersecting lines of the wheel teeth of a cylindrical gear engaged with the gear with the reference cylinder, the root cylinder and the tip cylinder thereof are also prolate epicycloids. In a central section in the direction of tooth width, both the toothed curves of the gear and the cylindrical gear engaged with the gear are involutes, i.e. in the central section in the direction of tooth width, the engagement of the pair of gears is equivalent to the engagement between traditional involute gears, so that the gear has constant transmission ratio. In other sections parallel to the central section, the tooth profiles of the gear and the mating cylindrical gear mutually correspond in a concavo-convex mode, the synthetic curvature between contact surfaces is ...

Speed reducer free from rigid impact on vehicle

The invention provides a speed reducer free from rigid impact on a vehicle. The speed reducer is formed by combining a plurality of speed-reducing blocks. The shape of a cross section of each speed-reducing block in the width and height directions is similar to trapezoid; and the top of the cross section is a horizontal straight line and two sides of the cross section are cosine curves. The vehicle cannot be subject to rigid impact and cannot generate the bumping phenomenon during passing the speed reducer. Low-speed vehicles can smoothly pass the speed reducer with little shock and bump on the vehicle, a driver, passengers and goods; and vehicles which do not slow down is suffered from flexible impact during passing the speed reducer, wherein the vehicle speed is higher and the impact force is larger. The invention has the advantages of overcoming the rigid impact of the traditional speed reducer on the vehicles and the speed reducer, prolonging the service life of the vehicles and the ...

Processing method for cylindrical gear with epicycloid tooth traces

The invention provides a processing method for a cylinder gear with epicycloid tooth traces, which comprises the following steps of: a disk is arranged on the surface of a movable planker and is a double-layer structure; an inner knife is arranged on an inner disk of an upper layer; an outer knife is arranged on an outer disk of a lower layer; the inner disk and the outer disk are connected by a double slider coupling; the inner knife and the outer knife are arranged at intervals along the circumference direction so that axes of the inner knife and the outer knife are mutually misaligned; the disk moves along the planker while rotating around its axis; a wheel blank rotates around its axis; a reference circle of the wheel blank corresponds to the disk; the linear velocity of the reference circle of the wheel blank is equal to the traveling speed of the planker; the movement of the disk relative to the planker is that a generating circle with the radius r does pure rolling along a basic ...

Method for preparing waterproof moisture-permeable coated fabric

The invention discloses a method for preparing a waterproof moisture-permeable coated fabric. The moisture permeability of a polyurethane coated fabric is improved by adding modified cellulose powder which accounts for 5 to 50 percent of the weight of polyurethane and is modified by a silane coupling agent into a polyurethane coating agent, and the waterproof property of the polyurethane is improved by adding inorganic powder which accounts for 0.5 to 5 percent of the weight of the polyurethane and is modified by the silane coupling agent, wherein the silane coupling agent accounts for 0.5 to 1 percent of the weight of the modified cellulose powder; and the silane coupling agent accounts for 0.5 to 1 percent of the weight of the inorganic powder. The modified polyurethane which accounts for 15 to 50 percent of the weight of a base fabric is coated on the base fabric of a knitted fabric, a woven fabric or a non-woven fabric to prepare the waterproof moisture-permeable coated fabric with ...

Filter material for decomposition of dioxin in high temperature smoke dust and preparation method of filter material

The invention discloses a filter material for decomposition of dioxin in high temperature smoke dust and a preparation method of the filter material. The filter material is formed by filling a laminated dust removal bag with a supported catalytic inner core, wherein the supported catalytic inner core comprises the following components: polytetrafluoroethylene resin, activated carbon and a catalyst. The preparation method comprises the following steps: uniformly mixing the polytetrafluoroethylene resin, activated carbon and the catalyst according to a weight percent of 1 to (0.1-10) to (0.01-1), and sequentially pressing and performing high-temperature sintering, thereby obtaining the supported catalytic inner core; and filling the laminated dust removal bag with the supported catalytic inner core which serves as a dust removal bag supporting body, thereby obtaining the filter material for decomposition of dioxin in high temperature smoke dust. According to the invention, the supported catalytic ...

Steel plate sharpening machine

The invention relates to the technical field of machining, in particular to a steel plate sharpening machine which is characterized in that two side grinding rings are fixedly connected to the side surface of a second grinding roller, two side grinding grooves are formed in the side surface of a first grinding roller, and an adjusting bin is movably mounted at the top of a supporting bottom box; a motor plate is arranged on one side of the adjusting bin, a fixed motor is installed on the top of the motor plate, the two fixed sliding blocks are clamped into the positioning sliding grooves, two opposite threads are arranged on the side portion of the fixed shaft and are in threaded connection with the fixed sliding blocks, and two scale columns are fixedly connected into the adjusting bin; one side of the clamping frame is fixedly connected with a scale finger block; according to the steel plate sharpening machine, through cooperation of the sharpening mechanism and the adjusting mechanism ...

Gas concentration and gas pressure adjustable cell culture case

The invention provides a gas concentration and pressure adjustable type cell culture box, comprising a box body, a plastic bag communication pipe and a manometer communication pipe, wherein a side wall of the box body is provided with an air pipe connected with an air bag containing needed gases; the plastic bag communication pipe is communicated with a sealed plastic bag; the manometer communication pipe is communicated with a manometer; the lower part of a side wall of the box body is provided with a water pipe by which water can be drained out of the box or injected in the box, and the top part of the box body is provided with a box cover provided with a seal ring. The gas concentration and pressure adjustable type cell culture box has the advantages that: (1) mixed gases do not need to be pre-prepared, and different gases are directly injected into the cell culture box, which builds all gas conditions needed and saves gases and time, and the operation is easy; (2) the gas pressure in ...

氧化锌线性电阻介质及其制备方法

... 一种氧化锌线性电阻介质及其制备方法，其重量组份为氧化锌60-90％、氧化镁1-10％、氧化铝1-20％、再加入3-15％多元添加剂氧化钛、氧化钙、莫来石、尖晶石的三至四种，经搅拌球磨，喷雾造粒，等静压成型，在电热隧道窑中于1250-1350℃烧成，所制成陶瓷电阻介质，其电阻率为1-10#+[4]欧姆・厘米，能量耐受能力大于800焦耳/厘米#+[3]，电阻温度系数可小至1×10#+[-3]欧姆/℃，电压非线性指数不大于1.1，广泛用于高压断路器的合闸电阻器，电力变压器的中性点接地电阻器，低压交直流电路的高能吸收电阻器，各种阻值的功率负载元件等。 ...

Rack with tooth trace shape of epicycloid

The invention discloses a rack with a tooth trace shape of an epicycloid. Intersection lines of wheel teeth of the rack with a dividing plane, a tooth root plane and a tooth top plane are all prolate epicycloids; intersection lines of wheel teeth of a cylinder gear which is meshed with the rack with a dividing cylinder plane, a tooth root cylinder plane and a tooth top cylinder plane are also prolate epicycloids; in a central section of a tooth width direction, a toothed curve of the rack is a straight line; a toothed curve of the cylinder gear meshed with the rack is an involute; in the central section of the tooth width direction, the meshing of the rack with the matched cylinder gear is equivalent to the meshing of a traditional involute gear with the rack; therefore, the rack has constant transmission rate. In other sections parallel to the central section, the rack mutually corresponds to tooth outlines of the matched cylinder gear in a convex-concave mode; because of small comprehensive ...

Solid supported type metal schiff base catalyst and preparation method thereof

The invention discloses Schiff base ligand compounds with a structural formula shown in a formula (I). In the formula, R1 is a hydrogen atom, a chlorine atom or a tert-butyl group; and R2 is the hydrogen atom, the chlorine atom or the tert-butyl group. The invention also discloses an immobilized catalyst which is prepared from the Schiff base ligand compounds and is used for series catalysis of oxygenated hydrocarbons by molecular oxygen. The immobilized catalyst for catalyzing the oxygenated hydrocarbons by the molecular oxygen has large immobilization amount of metal ions and high catalyticactivity, and can be used for industrialized production. A method of the invention is easy to obtain raw materials, has simple preparation technology, and is easy for mass production.

Method for preparing niobium sheet metal strip

Preparation method of silk fibroin-poly(hydroxybutyrate-hydroxyvalerate) composite fiber membrane

The invention discloses a preparation method of a silk fibroin-poly(hydroxybutyrate-hydroxyvalerate) composite fiber membrane, which comprises the steps of: mixing a prepared silk fibroin solution with a poly(hydroxybutyrate-hydroxyvalerate) solution to prepare a spinning solution, and conducting electrostatic spinning and aftertreatment. Based on the electrostatic spinning method, the composite fiber membrane is prepared, and the fiber membrane has good biocompatibility of the silk fibroin and the excellent mechanical performance of the poly(hydroxybutyrate-hydroxyvalerate) simultaneously, is more applicable to the biomedical field, and is expected to be used as a material for engineering of skin, nerves and cartilaginous tissues. The prepared composite fiber membrane has higher porosity, good mechanical performance, good air permeability and moisture permeability and large liquid absorption amount, can be degraded in human body and can promote tissue repair; and the preparation method ...

Speed reducer free from rigid impact on vehicle

The invention provides a speed reducer free from rigid impact on a vehicle. The speed reduceris formed by combining a plurality of speed-reducing blocks. The shape of a cross section of each speed-reducing block in the width and height directions is similar to trapezoid; and the top of the cross section is a straight line and two sides of the cross section are cosine curves. The vehicle cannot be subject to rigid impact and cannot generate the bumping phenomenon during passing the speed reducer. Low-speed vehicles can smoothly pass the speed reducer with little shock and bump on the vehicle, a driver, passengers and goods; and vehicles which do not slow down is suffered from flexible impact during passing the speed reducer, wherein the vehicle speed is higher and the impact force is larger. The invention has the advantages of overcoming the rigid impact of the traditional speed reducer on the vehicles and the speed reducer, prolonging the service life of the vehicles and the speed reducer ...

Quick degumming method for low-alkali cotton stalk bark fibre in high temperature

The invention discloses a fast colloid-removing method for high-temperature low-alkali cotton stack bark fiber. The technique flow thereof comprises: washing the cotton stack bark, drying, high-temperature low-alkali colloid-removing, washing, bleaching, washing, dehydrating, softening by applying oil, deoiling, drying and subtle drying of the cotton stack bark fiber, namely adopting the technique of boiling-bleaching-softening. The high-temperature high-pressure low-alkali technology is directly adopted to deeply degrade the hemicellulose and lignine in the cotton stack bark, and in the end hydrogen peroxiden is used for bleaching and softening the cotton stack bark fiber to prepare white and soft cotton stack bark fiber with high quality. The colloid removal rate of the cotton stack bark fiber after processing can achieve around 90%, and the removal rate of the hemicellulose content is around 97%. Compared with the disclosed patent technique of cotton stack bark fiber, as the invention ...

Adjustable cervical vertebra pulls pillow

The utility model relates to an adjustable cervical vertebra pulls pillow of medical treatment and health protection, specifically speaking are one kind can pull the pillow by the treatment cervical vertebra for health care that the cervical spondylopathy patient freely adjusted traction force size or personalized customization, belongs to medical treatment and health protection technical field. It includes pillow front end and pillow rear end, and pillow front end and pillow rear end are passed through adjusting screw and is linked to each other, still include the neck anticreep wing and neck fixation device, two neck anticreep wings are located the adjustable cervical vertebra pulls pillow both ends to connect pillow front end and pillow rear end, the neck fixation device includes occipital bone pad and studdle, and studdle pierces through the pillow front end and is fixed in pillow rear end one side, and the occipital bone pad sets up in the studdle top. The utility model discloses simple ...

Method of preparing soluble-high elasticity fibroin protein film

The invention discloses a preparation method for a soluble-high elastic silk fibroin membrane, and the preparation steps are as follows: firstly the silk is transformed into the pure silk fibroin solution with the weight percentage of 0.5 to 0.8 percent through degumming, dissolution, dialysis, purification and concentration; the purified and concentrated pure silk fibroin solution dries slowly into the silk fibroin membrane with the thickness of 30 to 50Mu m in a constant temperature and constant humidity box with the relative humidity of 60 to 80 percent and a temperature of 40 to 70 DEG C after being injected into a polystyrene culture dish. The soluble high elastic silk fibroin membrane prepared by the invention is provided with no toxicity or harm and has good biocompatibility, the swelling ratio of less than 3 percent for 3 hours in water, the dissolve-loss rate of less than 15 percent in 12 hours, the elongation breaking strength of more than 550N/cm <3>, the breaking elongation ...

Preparation method of silver-loaded mesoporous inorganic antibacterial agent

The invention discloses a preparation method of a silver-loaded mesoporous inorganic antibacterial agent. The preparation method comprises the following steps: dissolving a template agent, a titanium source and silver nitrate in water to obtain a silver sol solution; dropwise adding a carbonate aqueous solution to the silver sol solution and stirring and mixing the solutions to form titanium dioxide/silver carbonate gel; drying the gel and then carrying out thermal treatment, thus obtaining the mesoporous titanium dioxide inorganic antibacterial agent containing elemental silver. The prepared silver-loaded mesoporous inorganic antibacterial agent has specific surface area of 200-800cm<2>/g, aperture of 5-30nm and pore volume of 1.0-5.0cm<3>/g. The mass percent of the elemental silver is 26-30%. The antibacterial agent takes mesoporous titanium dioxide with good mould resistance as a carrier and the elemental silver is loaded in a titanium dioxide matrix, so that the broad-spectrum antibacterial ...

Rod-shaped raw material stripping device

The invention relates to a rod-shaped raw material stripping device which comprises a material frame (1) and at least two rotary shafts (2). Each rotary shaft (2) is driven by a motor (3) through a gear (4). Each rotary shaft (2) is provided with two rotary discs (5). A notch (51) for accommodating rod-shaped raw material is formed in each rotary disc (5). The diameters of the rotary discs (5) on the same rotary shaft (2) are equal. The notches (51) of the rotary discs (5) on the same rotary shaft (2) are horizontally opposite, and every two adjacent circular rotary discs (5) intersect. A strip-shaped outlet (11) is formed in the bottom of the material frame (1), one rotary shaft (2) is located right below the strip-shaped outlet (11), and the rotary discs (5) of the rotary shaft (2) are abutted against the strip-shaped outlet (11). The rod-shaped raw material stripping device has the advantages ordered rod-shaped raw material stripping can be achieved, and the device is low in fault rate ...

Heat-loss-reducing heat preserving furnace for nickel pig iron production

The utility model relates to the technical field of heat preserving furnaces, in particular to a heat preserving furnace for reducing heat loss for nickel pig iron production, which comprises a base, a first telescopic rod is fixedly connected onto the base, a support rod is fixedly connected to the top of the first telescopic rod, and a motor is fixedly connected to the side surface of the support rod. The output end of the motor penetrates through the supporting rod to be fixedly connected with a heat preservation box body, a fixing block is fixedly connected to the outer surface of the heat preservation box body, a second telescopic rod is rotationally connected to the bottom of the fixing block through a rotating shaft, the bottom of the second telescopic rod is rotationally connected with the base through a rotating shaft, and a heat preservation layer is fixedly connected to the interior of the heat preservation box body. According to the molten slurry heat preservation device, through ...

Gas concentration and gas pressure adjustable cell culture case

The invention provides a gas concentration and pressure adjustable type cell culture box, comprising a box body, a plastic bag communication pipe and a manometer communication pipe, wherein a side wall of the box body is provided with an air pipe connected with an air bag containing needed gases; the plastic bag communication pipe is communicated with a sealed plastic bag; the manometer communication pipe is communicated with a manometer; the lower part of a side wall of the box body is provided with a water pipe by which water can be drained out of the box or injected in the box, and the toppart of the box body is provided with a box cover provided with a seal ring. The gas concentration and pressure adjustable type cell culture box has the advantages that: (1) mixed gases do not need to be pre-prepared, and different gases are directly injected into the cell culture box, which builds all gas conditions needed and saves gases and time, and the operation is easy; (2) the gas pressurein ...

Measuring tool for roundness of glass circular disk and measuring method thereof

The invention discloses a measuring tool for the roundness of a glass circular disk and a measuring method thereof. The measuring tool comprises a standard component. Cross curves are printed on the surface of the standard component. With the midpoint of the cross curves as a circle center, a plurality of concentric circles are printed. The cross curves comprise four line segments using the midpoint as a starting point, and graduations are marked on at least one line segment. The zero point of the graduations is the midpoint of the cross curves. Compared with the prior art, a plurality of concentric circles can be printed on the standard component so as to adapt to roundness detection of glass circular disks with different specifications. A glass circular disk is placed on the standard component, and a measuring result can be read as long as the position of the glass circular disk is adjusted. The measuring method of the measuring tool is simple, convenient and reliable.

Trimerization anion surface active agent

The invention relates to a trimerization anion surface active agent which has the structure disclosed by the following general formula (I). The trimerization anion surface active agent comprises raw materials of cyanuric chloride, aliphatic amine, tarine and 3 (2- aminoethyl) amine and is synthesized by three reaction steps. Compared with neopelex, the trimerization anion surface active agent greatly reduces the critical micelle concentration, has excellent surface activity and wide application prospect in industrial and agricultural production and daily life of people, wherein R represents CnH(2n+1) (n represents even numbers from 6 to 14).

Method for preparing anti-aging thermosetting polyurethane hot melt adhesive membrane

The invention discloses a method for preparing an anti-aging thermosetting polyurethane hot melt adhesive membrane, which comprises: mixing low-crystallization-speed thermosetting polyurethane rubber particles with a water content of less than 0.1 percent and high-crystallization-speed thermosetting polyurethane rubber particles with a water content of less than 0.1 percent; mixing the mixture with a compound anti-aging agent to obtain a hot melt adhesive mixture; extruding and casting by a screw; and obtaining the anti-aging thermosetting polyurethane hot melt adhesive membrane with a thickness of 0.03 to 0.5 millimeter by rolling. The polyurethane hot melt adhesive membrane prepared by the method can be rolled after being cooled in the air, the use of release paper is avoided, the roller sticking in rolling is avoided, and the processing of the polyurethane hot melt adhesive membrane is convenient; and an antioxygen is added during plasticization in a compound mode, the softening temperature ...

Gemini surfactant containing triazine ring

Disclosed is a Gemini surface active agent as indicated in a general formula (I), the surface active agent has a molecular structure taking a triazine ring as a linking group and possesses rather highstability, and the critical surface tension thereof is far weaker than that of the common surface active agent, the critical micelle concentration is lower than that of the common surface active agent by 2 to 3 orders of magnitude, and the surface activity is excellent.

Method of preparing insoluble fibroin protein film

The invention discloses a preparation method for an insoluble silk fibroin membrane, and the preparation steps are as follows: obtaining the pure silk fibroin solution through the degumming, dissolution, dialysis and purification of the silk; mixing and stirring butyl titanate and ethanol with the volume ratio of 1 : 10, and adding the generated nanometer TiO2 and silk with the weight percentage of 0.4 to 0.8 percent into the pure silk solution, and adjusting the pH value as 5 to 6, and making magnetic stirring; the solution is dried into a membrane in the condition of a temperature of 20 to 40 DEG C and the relative humidity of 40 to 80 percent. The silk fibroin membrane of the invention is provided with no toxicity or harm and has good biocompatibility; the structure of the silk is a non crystalline state; the silk membrane has the water dissolve-loss rate of less than 2 percent, the elongation breaking strength of 50 to 80M/Pa, the breaking elongation rate of less than 40 percent and ...

RAISING EARLY RICE SEEDLINGS ON DRY LAND BY DIRECT SOWING, COVERING AND CONTROLLING OF WATER

Preparation method of composite nano-fiber support material of silk fibroin and calcium silicate

The invention discloses a preparation method of a composite nano-fiber support material of silk fibroin and calcium silicate. The method comprises the following steps: preparing the silk fibroin; preparing calcium silicate nanometer whiskers; mixing a solvent, the silk fibroin and the calcium silicate nanometer whiskers to obtain spinning solution; and finally carrying out electrostatic spinning and postprocessing to obtain the composite nano-fiber support material. In the invention, composite fiber with a nanometer number grade is prepared based on the electrostatic spinning method so that a nano-fiber complex has good biocompatibility of the silk fibroin and excellent bioactivity of the calcium silicate, is more applicable to the biomedical field, and is expected to become an ideal fiber material for a bone tissue engineering support; and the composite nano-fiber support prepared by the method has higher porosity, good mechanical properties, good air permeability and moisture-penetrability ...

Bionic tissue stent, preparation method therefor and application thereof

Disclosed are a bionic tissue stent, a preparation method therefor and an application thereof. The preparation method of the present invention is a 3D printing demolding method, and the preparation method can achieve the high-precision 3D engineering fabrication of a hydrogel material. The bionic tissue stent obtained by using said preparation method has a microscopic fine mesh structure, pores communicate, porosity is high, and the specific surface area is large, especially for bionic cartilage stents and osteochondral stents; moreover, the present invention has great application value in the treatment of articular cartilage diseases.