Preparation method of high-monodispersity hollow silica microsphere

Method for preparing cation polystyrene template based on porous materials

The invention discloses a method for preparing a cation polystyrene template based on porous materials, which comprises the following steps: by utilizing soap-free emulsion polymerization, after styrene monomer polymerization is carried out for 1.5 hours, starting to inject the mixture of cation DMC and deionized water (with volume ration being 2:1) into a reaction system by a micro sample injector. The first three times of injections are respectively carried out with the interval of half an hour, and the later two times of injections are carries out with the interval of one hour. Subsequently, a plurality of times of DMC mixtures can be continuously injected every three minutes, 50 Mul of the DMC mixture is injected each time, and the highest content of the injected DMC can reach up to 30-50% (compared with the mass of St). Aqueous millipore filter membrane (0.2 mu m) is then used for centrifuging and separating the prepared cation template, and finally a cation nano polystyrene template ...

Method for preparing cation polystyrene template based on porous materials

The invention discloses a method for preparing a cation polystyrene template based on porous materials, which comprises the following steps: by utilizing soap-free emulsion polymerization, after styrene monomer polymerization is carried out for 1.5 hours, starting to inject the mixture of cation DMC and deionized water (with volume ration being 2:1) into a reaction system by a micro sample injector. The first three times of injections are respectively carried out with the interval of half an hour, and the later two times of injections are carries out with the interval of one hour. Subsequently, a plurality of times of DMC mixtures can be continuously injected every three minutes, 50 Mul of the DMC mixture is injected each time, and the highest content of the injected DMC can reach up to 30-50% (compared with the mass of St). Aqueous millipore filter membrane (0.2 mu m) is then used for centrifuging and separating the prepared cation template, and finally a cation nano polystyrene template ...

Anti-toppling auxiliary positioning wheelchair

The invention discloses an anti-toppling auxiliary positioning wheelchair which comprises a wheelchair frame body, pedals are installed on the front side of the wheelchair frame body, guide wheels are rotationally connected to the lower side of the front portion of the wheelchair frame body, and moving wheels are rotationally connected to the side of the rear portion of the wheelchair frame body; one end of the first spring is installed in the side of the pedal, and the other end of the first spring is connected with a pressing rod. The anti-toppling auxiliary positioning type wheelchair is provided with a pressing rod and a pressing plate, the wheelchair inclines forwards, the ground can push the pressing rod, drive a movable frame to move, cooperate with transmission of a driving gear and a first gear block which are meshed, control a driven gear to rotate, cooperate with meshing transmission of the driven gear and a second gear block, and drive an adjusting frame to move; the adjusting ...

Activated carbon modified Bi2O3/TiO2 adsorption type photocatalyst as well as preparation method and application thereof

The invention relates to an activated carbon modified Bi2O3/TiO2 adsorption type photocatalyst as well as a preparation method and application thereof, and belongs to the fields of adsorbent/photocatalytic material preparation technology and environmental sewage treatment. Activated carbon, tetrabutyl titanate and bismuth nitrate are selected, a compound of activated carbon, titanium dioxide and a bismuth compound is prepared through a one-pot hydrothermal method, and finally the activated carbon modified Bi2O3/TiO2 adsorption type photocatalyst is prepared through temperature programming calcination. According to the prepared adsorption type photocatalyst, the defect that an existing adsorbent/photocatalyst needs washing, desorption or high-temperature calcination regeneration cycle is overcome, more importantly, simple preparation of the catalyst is achieved, and the technical challenge that large-scale application is difficult to achieve due to the fact that the reported adsorbent/photocatalyst ...

Electric wheelchair capable of adaptively adjusting uphill and downhill

The invention discloses an electric wheelchair capable of adaptively adjusting uphill and downhill, the electric wheelchair comprises a wheelchair body and an adaptive adjusting mechanism, an armrest part of the wheelchair body is provided with a controller, a support bracket is mounted below the wheelchair body, a servo motor is mounted on the upper surface of the support bracket, and the servo motor is connected with the wheelchair body. A battery supporting frame is connected to the lower surface of the supporting bracket, a storage battery is arranged on the battery supporting frame, two parallel supporting plates are connected to the lower end of the battery supporting frame, and a connecting shaft penetrates through bearings on the two supporting plates. The speed of the wheelchair body can be adaptively adjusted during uphill and downhill, so that a user can be assisted to adjust the speed of the wheelchair body during uphill and downhill and cannot immediately respond to downhill ...

Preparation method of high-monodispersity hollow silica microsphere

The invention relates to a preparation method of a hollow silica microsphere, in particular to a preparation method of a monodispersity composite material which takes an environment-friendly sodium silicate as a raw material for realizing various core-shell structures. The method provided by the invention comprises the following steps of: firstly, adding potassium persulfate and styrene monomer into deionized water, and then, heating; when the temperature reaches 70 DEG C, polymerizing for about 1-1.5 hours, and then, adding VTC (vinyl benzyltrimethyl ammonium chloride); carrying out soap-free emulsion polymerization to prepare a cationic polystyrene particle with good dispersity; after the cationic polystyrene particle is prepared, cooling to 30 DEG C; adding hydrochloric acid into the system to regulate the acidity; dropping a sodium silicate solution while stirring, wherein the dropping speed needs to be lower than 2ml/min; after dropping, carrying out catalytic hydrolysis on the sodium ...

Boron and linseed oil double-modification phenolic resin-based friction resistance composite material and preparation method thereof

The invention provides a boron and linseed oil double-modification phenolic resin-based friction resistance composite material and a preparation method thereof, and relates to the field of friction resistance composite materials. According to the preparation method, the phenolic resin is toughened and modified by using the linseed oil which has a rich source. The method for preparing the phenolicresin-based friction resistance composite material comprises the following steps: mixing boron modified phenolic resin prepolymer with relatively mature production process technology and self-made linseed oil modified phenolic resin prepolymer; adding a reinforcement material such as glass fiber and other components into the mixture; forming the boron and linseed oil double-modification phenolic resin by heating; and performing binary modification of toughness and heat resistance on the boron and linseed oil double-modification phenolic resin to obtain a phenolic resin-based friction resistance ...

Preparation method of intelligent non-PNIPAm-based temperature-sensitive nickel catalyst

The invention discloses a preparation method of an intelligent non-PNIPAm-based temperature-sensitive nickel catalyst, belonging to the technical field of organic polymer materials. Through imitation of automatic healing functions of organisms, by taking a self-healing polymer as a carrier and nickel nanoparticles as active ingredients, an intelligent adjustable temperature-sensitive nickel-based catalyst is prepared. The preparation method is simple, convenient to operate and low in requirements of the required devices, and has certain universality; the large-scale industrial production is easy to implement.

Boron and linseed oil double-modification phenolic resin-based friction resistance composite material and preparation method thereof

The invention provides a boron and linseed oil double-modification phenolic resin-based friction resistance composite material and a preparation method thereof, and relates to the field of friction resistance composite materials. According to the preparation method, the phenolic resin is toughened and modified by using the linseed oil which has a rich source. The method for preparing the phenolic resin-based friction resistance composite material comprises the following steps: mixing boron modified phenolic resin prepolymer with relatively mature production process technology and self-made linseed oil modified phenolic resin prepolymer; adding a reinforcement material such as glass fiber and other components into the mixture; forming the boron and linseed oil double-modification phenolic resin by heating; and performing binary modification of toughness and heat resistance on the boron and linseed oil double-modification phenolic resin to obtain a phenolic resin-based friction resistance ...

Preparation method of intelligent nickel-based catalyst with automatic on/off control function

The invention belongs to the technical field of functional and intelligent macromolecules and in particular relates to a preparation method of an intelligent nickel-based catalyst with an automatic on/off control function. The preparation method comprises the following steps: firstly, dissolving an initiator, functional monomers, an active component precursor and a cross-linking agent in dimethyl sulfoxide, introducing nitrogen into a solution for deoxidization, irradiating by an ultraviolet lamp after deoxidization for initiating polymerization to form a heat-sensitive control layer, and reducing nickel ions in the heat-sensitive control layer through sodium borohydride to form nickel nanoparticles; secondly, swelling any surface of the heat-sensitive control layer subjected to reduction through an acrylamide solution containing an initiator and a cross-linking agent, and irradiating by the ultraviolet lamp for initiating polymerization to form an inert polyacrylamide substrate layer so ...

Preparation method for in-situ carbon doped hollow titanium dioxide visible light photocatalyst

The invention relates to titanium dioxide photocatalysts, especially to a preparation method of an in-situ carbon doped hollow titanium dioxide photocatalyst and application of the photocatalyst in sewage treatment. In order to solve the disadvantage of needing to add a carbon precursor in existing preparation methods for carbon doped titanium dioxide, the invention provides a technology for in-situ preparation of the carbon doped hollow titanium dioxide visible light photocatalyst through carbonization of a cation template. The efficient carbon doped visible light photocatalyst is mainly obtained by control of monodispersion of the cation template, self-assembly of tetrabutyl titanate (TBT) on the template surface, catalytic hydrolysis of TBT and segmented programmed calcination to remove the template. Therefore, the method provided by the invention is continuation and further expansion of the titanium dioxide preparation technology, and is also invented directed at the disadvantages of ...

Preparation method of high selectivity and specificity nickel-based catalyst

The invention belongs to the selective catalytic technical field, and particularly relates to a preparation method of a high-selectivity and specificity nickel-based catalyst. Accdoring to the method, a substrate and an active component precursor are firstly dissolved in dimethylsulfoxide for self-assembly, then an initiator, a functional monomer and a cross linker are dissolved in the dimethylsulfoxide, then nitrogen is introduced into the solution for deoxidation, and after deoxidation, the solution is sealed and put under an ultraviolet lamp for irradiation to cause polymerization to form a catalyst precursor; and nickel ions in the precursor are reduced by sodium borohydride, and the imprinted substrate is by eluted to obtain the high selectivity and specificity nickel-based catalyst.