Polyurethane resin composite as well as preparation method and application thereof

The invention discloses a polyurethane resin composite as well as a preparation method and application thereof. The polyurethane resin composite comprises a component A and a component B, wherein the component A includes the following materials in parts by mass: 100 parts of hydroxy-terminated polybutadiene or hydrogenated hydroxy-terminated polybutadiene, 10-60 parts of plasticiser and 15-30 parts of isocyanate; the component B includes the following materials in parts by mass: 7-20 parts of organic amine hardener, 0-5 parts of light stabilizer, 0-2 parts of flatting agent and 0.1-0.5 part of foam suppressor; and the mass ratio of the component A to the component B is 100: (6-10). The obtained polyurethane material has the advantages of low shrinkage rate and better mechanical property and processing property and can be used for filling between shear cams of ballastless tracks of a high-speed railway and semicircular notches of track slabs.

Data right confirmation method based on symbol mapping coding and block chain

The invention provides a data right confirmation method based on symbol mapping coding and a block chain. According to the method, the user fingerprint information is directly mapped into the data object by utilizing symbol mapping codes, so that the effects of being irrelevant to data contents and having strong access control are achieved. Meanwhile, the right of the data can be confirmed by identifying the associated fingerprints, so that the anti-repudiation and anti-piracy effects are realized; besides, the block chain is used for replacing the endorsement effect of a trusted third party in the data sharing process, so that the data sharing process is not tampered, and trusted tracing is more convenient. According to the invention, credible access control and traitor tracing are realized, so that the data sharing system has relatively strong anti-repudiation and anti-piracy capabilities.

Polyurethane resin used for filling heightening support of bridge and preparation method and construction method thereof

The invention discloses a polyurethane resin used for filling a heightening support of a bridge and a preparation method and a construction method thereof. A component A is a prepolymer component and comprises polyether polyol and isophorone Diisocyanate (IPD) in a weight ratio of 100:(14.6-41); a component B is a curing agent component and comprises an aromatic diamine chain extender and a selectively used viscosity reducer in a weight ratio of 100:(0-70.5); the components A and B are mixed in a weight ratio of 100:(7-36) and cured at a room temperature to form polyurethane resin, wherein the polyether polyol is polyether polyol with the content of a terminated primary hydroxyl group of more than 70 percent, polyether trihydric alcohol or a doped mixture thereof; the viscosity of the polyether polyol at a temperature of 25 DEG C is less than 1300 mPa.s; and the number-average molecular weight of the polyether polyol is 1000-6000. After components of the resin are mixed, the stirring time ...

A heart valve ring structure model for teaching

The utility model discloses a heart valve ring structure model for teaching, including aorta model, pulmonary artery model, tricuspid valve model, still include the artifical mechanical lamella model of bicuspid valve model and bicuspid valve, wherein the artifical mechanical lamella model of bicuspid valve is the substituting lamella ring of pathology of bicuspid valve model, and it is partly that omission heart valve loop constructs, clockwise the encircleing of the artifical mechanical lamella model of pulmonary artery model, tricuspid valve model, bicuspid valve model or bicuspid valve sets up in the aorta model outside, the pulmonary artery model passes through the universal joint with the aorta model and is connected, the artifical mechanical lamella model of tricuspid valve model, bicuspid valve model or bicuspid valve all is connected with aorta model buckle. The utility model discloses simple structure, the position is clear between each part, disassembles the convenience, and ...

Head related function three-dimensional data compression method and system

Embodiments of the invention provide a head related pulse response three-dimensional data compression method. The method of the invention comprises: reconstructing an HRIR three-dimensional data to an HRIR with the minimum phase; de-convoluting the HRIR with the minimum phase into an elevation plane filter in a low order FIR form and a horizontal plane filter in a high order FIR form; modeling the horizontal plane filter in a high order FIR form into the horizontal plane filter in a low order IIR form, storing, by a processor, the elevation plane filter in a low order FIR form and the elevation plane filter in the IIR form to a local cache. Embodiments of the invention solve a problem of low compression rate of the HRIR three-dimensional data in the prior art.

Pushing device for tail beam of hydraulic support

The invention discloses a pushing device for a tail beam of a hydraulic support. A penetrating through cavity is formed in a cylinder barrel; a first through hole and a second through hole are formed in the side wall of the cylinder barrel; a first connector base and a second connector base are respectively arranged at the first through hole and the second through hole; a cylinder cover is welded at the end, close to the first through hole, of the cylinder barrel; the end, provided with a piston, of a piston rod extends into the penetrating through cavity from the other end of the cylinder barrel; the piston is located between the first through hole and the second through hole; a stop collar fixed in a sleeve is arranged outside the piston rod and located on the side, far away from the first through hole, of the second through hole; a first sealing part is arranged between the piston and the cylinder barrel; a second sealing part is arranged between the stop collar and the piston rod. The ...

Core/shell structural zinc particle/PVDF (polyvinylidene fluoride) dielectric medium and preparation method thereof

The invention relates to a core/shell structural zinc particle/PVDF (polyvinylidene fluoride) dielectric medium and a preparation method thereof. The core/shell structural zinc particle/PVDF dielectric medium comprises 50 to 60wt% of PVDF resin and 40 to 50 wt% of surface modified composite structural zinc particles; the core-shell structural zinc particle/PVDF dielectric medium is prepared in the steps such as peroxidation, powder mixing, cold pressing, hot pressing and the like. Based on a multi-interface polarization mode between the composite zinc particle and the polymer, the dielectric constant of polymer dielectric medium is improved by changing the thickness of ZnO so as to effectively control the variation of system dielectric constant, loss and electric conductivity, and the dielectric loss is reduced. Through the little consumption of composite particles, the composite dielectric medium has high mechanic strength and flexibility.

Method for preparing polyacrylonitrile resin with narrow molecular weight distribution

The present invention discloses process of preparing polyacrylonitrile resin with narrow molecular weight distribution. The process includes the following steps: dissolving metal halide FeCl3 and ligand itacoic acid in solvent N, N-dimethyl formamide; dissolving initiator azo diisobutyronitrile in monomer acrylonitrile and introducing N2 to eliminate O2; reverse atom transferring active free radical polymerization for at least 6 hr; precipitating the product, suction filtering, washing with concentrated hydrochloric acid solution and drying. By means of the said process, polyacrylonitrile resin with narrow molecular weight distribution of 1.14-1.21 may be prepared.

Connecting structure of top beam side protecting plate and front beam side protecting plate

The invention discloses a connecting structure of a top beam side protecting plate and a front beam side protecting plate, applied to an end hydraulic support. The connecting structure comprises a front beam side protecting plate, a top beam side protecting plate and a rotating oil cylinder; the front beam side protecting plate comprises a first plate body, a first mounting part, a tongue part and a first hinge part; the tongue part and the first mounting part are positioned on the same side of the first hinge part, and a groove cavity is formed in the tongue part; the top beam side protecting plate comprises a second plate body, a second mounting part, a second hinge part and a lapping plate; the second mounting part and the lapping plate are positioned on the same side of the second hinge part; two ends of the rotating oil cylinder are respectively hinged to the first mounting part and the second mounting part; the front beam side protecting plate and the top beam side protecting plate ...

Automatic inspection and maintenance system for cable trench

The invention discloses an automatic inspection and maintenance system for a cable trench. The automatic inspection and maintenance system comprises a horizontal sliding rail, a fixed bracket, a detection assembly and an energy storage assembly, two ends of the fixed bracket are fixedly connected with two side walls of the cable trench respectively; the horizontal sliding rail is fixed below the fixed bracket; the detection assembly comprises a supporting frame, a sliding motor, a vertical telescopic rod, a connecting ball, a horizontal telescopic rod, a detection ball and an electric connector. The supporting frame is arranged on the horizontal sliding rail in a sliding mode. The sliding motor is arranged on the supporting frame and is in transmission connection with the supporting frame; the second end of the vertical telescopic rod is connected with the connecting ball; a connecting bin is arranged in the connecting ball; a power connection head is arranged in the connection bin; the ...

Jack device for automatically controlling separation trend of roadway roof

The invention discloses a jack device for automatically controlling the separation trend of a roadway roof, which comprises a jack and a hydraulic control system, and the jack comprises a lug ring, and an outer cylinder body, a second-stage cylinder body and a third-stage cylinder body which are coaxial; a stroke sensor I and a stroke sensor II are mounted in the outer cylinder body; a pressure sensor is mounted outside the outer cylinder body; the hydraulic control system controls hydraulic oil in and out of the first hydraulic oil port and the second hydraulic oil port according to sensor signals. The bed separation roof is supported through the jack, the bed separation change trend of the roof is automatically judged through change signals of the first stroke sensor, the second stroke sensor and the pressure sensor in the jack, the pressure of the hydraulic cavity in the jack is changed according to the judged change trend, and the jack completes various telescopic actions; and reinforced ...

Ultrasonic sensitive medicament-carried nanometer bubble

The invention discloses an ultrasonic sensitive medicament-carried nanometer bubble with the grain diameter of 20-700 nanometers. A film-forming material of the ultrasonic sensitive medicament-carriednanometer bubble is an amphiphilic segmented copolymer which is internally filled with a fluorine-carbon compound or fluorine-sulphur compound, carries an angiography medicament or therapy medicament, stably exists in a nanometer bubble mode in blood circulation, is easy to penetrate through vascular endothelial cell gaps to enter a target site and is broken under the ultrasonic action to partially release the medicaments. The invention integrates directional diagnosis and targeted therapy and has greater clinical application values.

Polyester type polyurethane microporous sole material and preparation method thereof

The invention discloses a polyester type polyurethane microporous sole material and a preparation method thereof. The preparation of Component A comprises the following steps: mixing 60-80 weight parts of polyester polyol, 30-10 weight parts of polymer polyol, 7-10 weight parts of chain extender, 0.6-1.2 weight part(s)of catalyst and 0.5-1.0 weight part of foam stabilizer for 1 hour at the temperature of 75 DEG C plus or minus 3 DEG C, reducing the temperature to 42 DEG C plus or minus 3 DEG C, adding 0.4-0.5 weight part of water, and mixing for 1 hour; the preparation of Component B comprises the following steps: mixing 80-100 weight parts of MDI, 0-20 weight part(s) of liquefied MDI and 35-95 weight parts of polyester polyol for 2 hours at the temperature of 80 DEG C under the nitrogen protection; and the preparation of a polyurethane microporous elastomer comprises the following steps: maintaining the temperature of Component A at 50 DEG C plus or minus 2 DEG C, maintaining the temperature ...

Normal-temperature solidification polyurethane elastomer waterproof material and preparation method thereof

The invention discloses a normal-temperature solidification polyurethane elastomer waterproof material and a preparation method thereof. The polyurethane waterproof material comprises a component A and a component B. Proportioning by weight percent, the component A is an isocyanate prepolymer with the content of 4-15% of isocyanic acid radical NCO; the component B comprises 0-65% of polyether glycol with the degree of functionality of 2-3 and the molecular weight of 1,000-5,000, 0.6-1.2% of organic bismuth catalyst, 20-27.5% of polybasic amine, 0-1.3% of antioxidant and 12.5-71.9% of plasticizer. The component A and the component B are mixed according to the weight ratio of 100(60-81); the material obtained by room-temperature solidification has the mechanical properties that the tensile strength is 15-35MPa, the tearing strength is 44-62N/mm, the breaking elongation rate is 405-840%, and the Shao' hardness is 75-90A.

Method for preparing polyacrylonitrile resin with narrow molecular weight distribution

Front beam lateral protection plate and top beam lateral protection plate connection structure

The invention discloses a front beam lateral protection plate and a top beam lateral protection plate connection structure used for an end hydraulic support. The connection structure comprises a front beam lateral protection plate, a top beam lateral protection plate and a rotating oil cylinder. The front beam lateral protection plate comprises a first plate body, a first installation portion, a tongue portion and a first hinge portion. The tongue portion and the first installation portion are located on the same side of the first hinge portion. The top beam lateral protection plate comprises a second plate body, a second installation portion, a second hinge portion and a groove cavity. The second installation portion and the groove cavity are located on the same side of the second hinge portion. Two ends of the rotating oil cylinder are hinged to the first installation portion and the second installation portion. The front beam lateral protection plate is hinged to the top beam lateral ...

Polyurethane resin composition as well as preparation method and application thereof

High-flexibility end support side protection structure

The invention discloses a high-flexibility end support side protection structure which comprises a mounting plate and n side protection plates, wherein n refers to a natural number larger than or equal to 2. The side protection plates are hinged sequentially, each side protection plate consists of two subsidiary protection plates, a first retractable structure and a second retractable structure are arranged at two ends of the two subsidiary protection plates of each side protection plate respectively, and each two subsidiary protection plates are in cup joint through the corresponding first retractable structure and the corresponding second retractable structure. One side, close to the mounting plate, of each subsidiary protection plate is provided with a baffle, a telescoping cylinder is connected between the baffles of the two subsidiary protection plates of each side protection plate, two ends of each telescoping cylinder are hinged to the baffles of the corresponding subsidiary protection ...

Polymer dielectric medium with low dielectric constant and low loss and preparation method of polymer dielectric medium

The invention discloses a polymer dielectric medium with low dielectric constant and low loss and a preparation method of the polymer dielectric medium. The polymer dielectric medium comprises the following raw materials: 50-60% of epoxy resin system, and 40-50% of mixed boron nitride nanoparticles, wherein the mixed boron nitride nanoparticle is a mixture of a boron nitride nanotube and a boron nitride nanotube; the epoxy resin system is formed by 100phr of epoxy resin E-51, 85phr of methyl hexahydrophthalic anhydride and 1phr of benzyl dimethylamine in a mixing manner. The thermal breakdown voltage of the polymer dielectric medium is significantly improved by the polymer dielectric material with high heat conductivity and high electric breakdown, the service life is prolonged, the dielectric constant and loss and the heat expansion coefficient are reduced, the mechanical strength and the tenacity are improved, the highest heat conductivity can be up to 5.26W/mK, the volume resistivity ...

Nourishing liquor of ginseng and Lycium chinense and its prodn. method

A medical tonic wine for nourishing blood, vital energy, liver and kidney and delaying sanility is prepared from ginseng, wolfberry fruit, prepared rehmannia root, and prepared fleece flower root by percolation filtration method.

Three-dimensional head-related impulse response data compressing method based on canonical multi-decomposition

The embodiment of the invention provides a three-dimensional head-related impulse response data compressing method based on canonical multi-decomposition. The method comprises the steps that a processor performs canonical decomposition on a three-dimensional head-related impulse response data set to obtain three two-dimensional matrixes; the processor initializes the three two-dimensional matrixes; the processor iterates and updates the three initialized two-dimensional matrixes to obtain coefficient matrixes corresponding to the three two-dimensional matrixes; the processor calculates the reconstruction approximation degree of the three iterated two-dimensional matrixes; the processor judges whether an absolute value of difference between the two reconstruction approximation degrees, obtained by two adjacent iterations, of the three two-dimensional matrixes is smaller than 10<-4>; if so, the processor stops iteration and stores the three two-dimensional matrixes in a local cache, and otherwise ...

End hydraulic support spray head capable of outputting water stably

The invention discloses an end hydraulic support spray head capable of outputting water stably. The end hydraulic support spray head comprises a shell and an end cap, wherein a water flow channel is arranged in the shell and communicates with the outside by a water spray outlet; the inner wall, close to one end of the water spray outlet, of the water flow channel is a horn-shaped inner surface of which the inner diameter is gradually increased towards the water spray outlet direction; the end cap is provided with a conical outer surface fitting with the horn-shaped inner surface; a diversion ring is fixed in the water flow channel and provided with water flow through holes; one end, close to the diversion ring, of the end cap is connected to the diversion ring by an elastic piece. According to the end hydraulic support spray head capable of outputting water stably disclosed by the invention, improvement on the spray head structure is achieved, and the sprayed water flow is stable in flow ...

Side protecting structure of end hydraulic support

The invention discloses a side protecting structure of an end hydraulic support. The side protecting structure comprises a mounting plate and n side protecting plates which are sequentially hinged to one another, wherein each side protecting plate is provided with at least one first connecting structure, the mounting plate is provided with a plurality of second connecting structures, at least one hydraulic oil cylinder is arranged between each side protecting plate and the mounting plate, one end of the piston rod of each hydraulic oil cylinder is hinged to the corresponding side protecting plate by the corresponding first connecting structure and one end of the cylinder body is hinged to the mounting plate by the corresponding second connecting structure, each first connecting structure is a fan-shaped connecting plate that is fixed on the side protecting plate and provided with a hinge hole, each second connecting structure is provided with a connecting groove with a hinge hole, n is ...

Method for processing head-related impulse response data set

The embodiment of the invention provides a method for processing a head-related impulse response data set. The method comprises the following steps: a processor groups the head-related impulse response (HRIR) data set according to an angle of elevation and/or a horizontal angle; the processor selects the HRIR sample point with a minimum reconstruction error value in the grouped HRIR data set as a high-dimensional HRIR sample point through locally linear embedding (LLE); the processor reduces the dimension of the HRIR sample point to a low-dimensional space to obtain low-dimension HRIR sample points; the processor adopts sectional straight line fitting to select characteristic HRIR sample points in the low-dimension HRIR sample points; and the processor combines the characteristic HRIR sample points into a three-dimensional matrix according to an angle-of-elevation sequence and/or a horizontal angle sequence. The embodiment of the invention solves the problem of excessive errors of a characteristic ...

Spray nozzle of end hydraulic support

The invention discloses a spray nozzle of an end hydraulic support. The spray nozzle comprises a shell, a positioning ball core, a guiding ball shell and a switching ball shell. The shell comprises a ball-shaped portion provided with a water inlet and a water outlet and a pipeline portion provided with a water inlet pipeline, the water inlet of the ball-shaped portion is communicated with the water inlet pipeline of the pipeline portion, the ball-shaped portion is fixedly connected with the pipeline portion, the positioning ball core, the guiding ball shell, the switching ball shell and the ball-shaped portion are concentrically arranged, the outer wall of the guiding ball shell is attached to the inner wall of the ball-shaped portion, the outer wall of the switching ball shell is fixed with the inner wall of the guiding ball shell, the inner wall of the switching ball shell is fixed with the outer wall of the positioning ball core, the guiding ball shell is provided with a first opening ...

Normal-temperature solidification polyurethane elastomer waterproof material and preparation method thereof

The invention discloses a normal-temperature solidification polyurethane elastomer waterproof material and a preparation method thereof. The polyurethane waterproof material comprises a component A and a component B. Proportioning by weight percent, the component A is an isocyanate prepolymer with the content of 4-15% of isocyanic acid radical NCO; the component B comprises 0-65% of polyether glycol with the degree of functionality of 2-3 and the molecular weight of 1,000-5,000, 0.6-1.2% of organic bismuth catalyst, 20-27.5% of polybasic amine, 0-1.3% of antioxidant and 12.5-71.9% of plasticizer. The component A and the component B are mixed according to the weight ratio of 100(60-81); the material obtained by room-temperature solidification has the mechanical properties that the tensile strength is 15-35MPa, the tearing strength is 44-62N/mm, the breaking elongation rate is 405-840%, and the Shao' hardness is 75-90A.

Submersible slip casting machine

The submerged slurry injector is used in underwater injecting chemical slurry to the upstream face of water retaining building to repair crack and other damages. The submerged slurry injector has sucking disc type slurry injecting box operating on inducing slurry injecting principle, and can realize direct slurry injection without forming hole, find out leaking hole and crack before injecting and inspect injection effect after injecting. It is also provided with air storing slurry pressurizing bag for rationing injection with injecting pressure not affected by the water depth. The present invention may be operated by only one diver and needs no outside control.

Wear-resistant spraying polyurethane resin composition, and preparation method and construction method thereof

The invention discloses a wear-resistant spraying polyurethane resin composition, and a preparation method and construction method thereof. The composition comprises a component A and a component B, wherein the component A comprises the following components in parts by mass: 35-70% of polymer polyalcohol A, 3-9% of plasticizer and 25-60% of isocyanate; the NCO/OH mole ratio is 1.5-5.72; the component B comprises the following components in parts by mass: 13-30% of organic amine curing agent, 0-75% of plasticizer, 0-80% of polymer polyalcohol B and 0.1-1% of catalyst; and the volume ratio of the component A to the component B is 100/50-100/100. The composition is suitable for high-pressure spraying and static mixed spraying, can be sprayed at room temperature or under heating conditions, is not sensitive to humidity, and can not have the phenomenon of foaming or bulging even in an environment with the relative humidity of higher than 70% or on a wet base surface basal plane or under the ...

Hydraulic bracket for end socket

The invention discloses a hydraulic bracket for an end socket. The hydraulic bracket comprises a mounting frame, a connecting plate, a lateral protecting plate and a driving hydraulic cylinder, wherein the mounting frame comprises a top beam, a first vertical column and a second vertical column; the first vertical column and the second vertical column support the two ends of the top beam; the connecting plate is horizontally arranged; the lateral protecting plate is vertically arranged; the lateral protecting plate comprises a connecting end close to the connecting plate and a free end away from the connecting plate; one end of the connecting plate is fixed with the top beam; the other end of the connecting plate is hinged with the connecting end of the lateral protecting plate; one end of a cylinder body of the driving hydraulic cylinder is hinged with the mounting frame; one end of a piston rod is hinged with the middle part of the lateral protecting plate. The hydraulic bracket for the ...