89results about How to "Uniform crosslinking" patented technology

The invention is applicable to the field of flexible sensors and provides a conductive rubber material for a flexible sensor and a preparation method and application of the conductive rubber material. The conductive rubber material comprises, by weight, 100 parts of rubber base bodies and conductive filler, wherein the conductive filler comprises, by weight, 5-50 parts of conductive black and/or 20-100 parts of silver-containing conductive filler bodies; the conductive rubber material is made in the mode that the conductive filler is dispersed in the rubber material, and radiation crosslinking is conducted through electron beams or gamma rays.

A process for preparing the composite nano-class filtering membrane includes such steps as providing the ultra-filter membrane made of polysulfone or poly vinylidene fluoride as substrate, dipping in the aqueous solution of aminoester polyacrylate polymers chosen from polymethyl acrylate-N, N-dimethylamino ethylester, polymethyl acrylate-N, N-dimethylamino methylester, polymethyl acrylate-N, N-diethylamino methylester, etc, drying, and beta-ray irradiating for cross-linking.

The invention is suitable for the field of flexible sensors and provides a conductive rubber material for flexible sensors and a preparation method and application thereof. The conductive rubber material is prepared from, by weight, 100 parts of rubber matrixes and 5-200 parts of conductive filler. The conductive rubber material is prepared in the mode that the conductive filler is dispersed in a rubber material and subjected to radiation crosslinking of electron beams or gamma rays.

The invention relates to an easy-peel highlighted silane crosslinking flame-retardant polyolefin insulation material, a preparation method and application thereof, and aims to provide the polyolefin insulation material relatively good in mechanical property and electrical property. A prepared insulating layer of a low-smoke halogen-free flame-retardant cable is uniform in crosslinking, excellent in temperature endurance and easy to peel after being made into the cable, and in a high-speed paying-off situation, the cable surface is free of melt fracture, smooth, highlighted and easy to peel. The technical scheme is as follows: the polyolefin insulation material comprises an A material and a B material, wherein the A material comprises the following components: EVA, PE, a silane coupling agent, a primary antioxidant, an auxiliary antioxidant, an initiator, a compatilizer, a lubricating agent, a fire retardant and a filler; the B material comprises the following components: EVA, PE, a catalyst, a primary antioxidant, an auxiliary antioxidant, a compatilizer, a lubricating agent, a fire retardant and a filler.

The invention discloses a preparation method of antibacterial super absorbent resin. The preparation method comprises the following steps: firstly adding acrylic acid and deionized water into a reactor, adding 50% sodium hydroxide solution for neutralization, and adding acryloyl morpholine, ultrafine silicon dioxide and a complex cross-linking agent; then introducing nitrogen to remove oxygen for 30 min, adding an initiator to initiate a polymerization reaction at 20-30 DEG C, and regarding that the reaction is completed when the temperature does not rise; pelleting, drying and crushing gel to obtain water-absorbent resin particles; finally carrying out high-temperature processing at 120 DEG C on the resin particles through ethylene glycol, a nano-silver antibacterial and 25% aluminum sulfate for 2-5 hours to obtain the antibacterial super absorbent resin. The reparation method adopts a new antibacterial polymeric monomer, and the resin particles can reach a good antibacterial and sterilizing effect; a high low temperature compound type cross-linking agent is adopted, so that the cross-linking of molecules is more uniform; suspended silicon dioxide particles can guarantee good conductivity among the resin particles. No azo initiator is used, so that the antibacterial super absorbent resin is free of azo substance residues.

The invention discloses a high-temperature-resistant silicone rubber foam material and a preparation method thereof. The preparation method of the high-temperature-resistant silicone rubber foam material is characterized by comprising the following steps: mixing 100 parts of silicone rubber base stock, 20-35 parts of a reinforcing agent, 2-3 parts of a structure controlling agent, 0-0.2 part of colour master batch, 60-150 parts of a pore-forming agent and 4-5 parts of a radiation sensitizer, moulding, crosslinking through gamma ray radiation, forming pores through subsection dissolving-out, and drying, so that the silicone rubber foam material which is resistant to high temperature of 250 DEG C and still maintains excellent performance after equivalent time of 20000 hours can be obtained. The preparation method of the high-temperature-resistant silicone rubber foam material has the advantages that radiation crosslinking and dissolving-out pore forming are combined, so that crosslinking is uniform, control is easy, energy conservation and environmental protection are realized, a technology is concise, reproducibility is good, and production efficiency is high; the high-temperature-resistant silicone rubber foam material still maintains high tensile strength, high weight loss, low longitudinal deformation and low surface hardness after the equivalent time of 20000 hours at the temperature of 250 DEG C, permanent compressive deformation is slightly increased, the high-temperature-resistant silicone rubber foam material does not become brittle or hard, and the high-temperature-resistant silicone rubber foam material can serve as filling and positioning, sealing cushion, cable insulation as well as buffer and vibration-absorptive materials or parts which are used in high-temperature environment.

The invention discloses organic peroxide master batches and a preparation method of the master batches. The master batches take polyolefine elastomer (POE), ethylene-vinyl acetate copolymer (EVA), ethylene-propylene-butadiene ethylene-propylene diene monomer (EPDM) and other polymer as a substrate resin; and the selected peroxide is required to cross-link the substrate resin. The substrate resin granules are added in a liquid emulsion medium, which contains 0-98% of peroxide; at certain temperature and after enough long time, the polymer granules absorb the peroxide to prepare the peroxide master batches with 20-50% high concentration; and after the peroxide is absorbed, the liquid medium is required to exist around the polymer granules at certain quantity. The peroxide master batches disclosed by the invention are mainly used for the cross-linking process of polymers, thus the dispersion of the peroxide in a substrate material is improved, the organic peroxide is well dispersed in the substrate material and the material cross-linking is more uniform.

The invention discloses a low-density and high-porosity silicone rubber foam material and a preparation method thereof. The method is characterized by comprising the following steps: 100 parts of silicone rubber, 10 to 50 parts of a reinforcing agent, 1 to 7 parts of a control agent, 200 to 600 parts of a pore-forming agent, and 0 to 5 parts of a sensibilizer are mixed and molded, and then are radiated through gamma ray, so as to be subjected to crosslinking; the amount of radiation absorber is 30 to 100kGy; then the low-density and high-porosity silicone rubber foam material with excellent performance is obtained after elution and freeze drying. The material has the advantages that the technology is simple, complex chemical control process or professional auxiliary equipment is not needed, simple equipment, such as a two-roll mill, is only needed, and the cost is low; the silicone rubber foam material has the characteristics of low density and high porosity, is soft in material and excellent in elasticity, and can serve as a filling, positioning, sound-proof and vibration-absorptive material.

The invention discloses a self-adhesion silicon rubber material and a preparation method thereof. The preparation method is characterized in that 100 parts of silicon rubber, 10 to 80 parts of a reinforcing agent, 1 to 9 parts of a controlling agent and 0 to 5 parts of a sensitizing agent are mixed and formed, and then are subjected to gamma-ray radiation to be crosslinked to obtain the self-adhesion silicon rubber material with excellent performance, wherein the radiation absorbed dose is 30 to 100 kGy. The self-adhesionsilicon rubber material and the preparation method thereof have the advantages that the process is simple, complex chemical raw materials and process control or professional auxiliary equipment are not needed, and the cost is relatively low; and the prepared silicon rubber material can be well adhered to various components or assemblies, such as metal, glass, polyethylene, polytetrafluoroethylene and the like, can maintain lasting adhesion, and can effectively prevent the components or the assemblies from falling off or sliding.

The invention discloses a preparation method of a high-strength and high-adhesion branched starch composite polyacrylamide/ polyvinyl alcohol hydrogel with a strong hydrogen bonding effect, the methodcomprises the following steps: branched starch, polyvinyl alcohol, polymer monomer acrylamide and a photoinitiator are dissolved to obtain a uniform mixed solution, firstly, the uniform mixed solution is initiated under the condition of ultraviolet light, so that the acrylamide is polymerized, micro-crystals are formed in a polyvinyl alcohol network in the freezing and unfreezing process, a multi-hydrogen bond interaction can be formed between molecular chains of the branched starch and molecular chains of the polyacrylamide and molecular chains of the polyvinyl alcohol, and under the doubleactions of multiple hydrogen bonds and the micro-crystals, multi-physical-bond cooperative cross-linking is realized. The preparation process is simple and convenient to operate, and the prepared hydrogel has relatively high mechanical strength and excellent adhesion property on the surface of glass, and can be used as a preferred material of a soft robot.

The invention discloses a soft finishing agent for wood fabric and the application. The agent in the invention is suitable for softening finishing of wood fabric. Performance indexes of the wood fabric in the invention, such as softness (pure bending, shearing performance, drape coefficient), anti-pilling (pilling index), machine washing performance (total shrinkage and relaxed shrinkage) and so on, are superior to the related standard of international woodmark and nation. The invention is provided with good quality for color even degree in vision, good performance for anti-teasing and anti-pilling, good handle feeling and good softness degree. There is no international forbidden material in it and when finishing there is no poisonous gas with strong odor discharging. It is in favor of environmental protection.

The invention relates to a preparation method of super absorbent resin resistant to moisture absorption and caking. The preparation method comprises the following steps: introducing nitrogen to removal oxygen after mixing acrylic acid, water and a cross-linking agent, then adding an initiating agent until the temperature is not increased, and then preserving the temperature to obtain a product; treating the obtained product to obtain resin particles; adding reinforcing agent powder into the resin particles to be mixed uniformly, then adding a surface cross-linking solution to be stirred uniformly, preserving the temperature at the temperature of 120 to 200 DEG C to obtain the super absorbent resin, wherein the reinforcing agent is selected from one or more of calcium oxide, kaoline, silica, aluminum sulfate, aluminum oxide, calcium carbonate and magnesium carbonate. The super absorbent resin synthesized by using the method is highly uniform in surface cross-linking degree and high in strength, is not easy for moisture absorption and caking in air, can be stored for longer time, is unlikely to cause gel blockage after liquid absorption, and has good liquid flowing performance and conduction performance.

The invention relates to a low-smoke zero-halogen flame-retardant polyolefin thermoplastic elastomer and a preparation method thereof and particularly relates to an elastic polyolefin particle for preparing a soft movable low-smoke zero-halogen flame-retardant cable insulation layer or sheath layer and a preparation method thereof. The low-smoke zero-halogen flame-retardant polyolefin thermoplastic elastomer is prepared by mixing raw materials such as an ethylene-octene copolymer, an ethylene propylene diene monomer, ethylene-vinyl acetate copolymerization resin, aluminum hydroxide, magnesium hydrate, magnesium stearate, an antioxidant, polyethylene wax, a crosslinking agent, a vulcanizing agent and the like, and extruding by using a six-temperature-stage double-screw extruder. When used for manufacturing electric wires and cables, the low-smoke zero-halogen flame-retardant polyolefin thermoplastic elastomer has the characteristics of simple machining process, low smoke, zero halogen, flame retardance, softness, good elasticity, good wear resistance and the like.

The invention relates to the field of hyaluronic acid plural gel and particularly relates to a preparation method of hyaluronic acid plural gel. According to the preparation method, homogenizing of a crosslinking system and the prepared gel is realized through the combination of multiple parameters in multiple time periods, and sufficient uniform mixing of the system is realized through low-temperature and high-frequency oscillation in earlier stage; and in the middle and later stages, different oscillation frequencies are set to promote reactions producing gel and reduce gel damage in the preparation process so as to obtain a new plural gel. The invention also provides an application of the plural gel in medical treatment or prevention.

A resin composition comprises (a) 100 parts by weight of at least one compound selected from the group consisting of phenol resins and brominated phenol resins, (b) 20 to 500 parts by weight of a crystalline olefin resin, provides that copolymers of ethylene with unsaturated carboxylic acid ester or vinyl acetate are precluded, and (c) 0 to 300 parts by weight of a non-aromatic softening agent for rubber. The resin composition is easy to handle in dynamic cross-linking of rubber or a thermoplastic elastomer to give uniform cross-linking. A cross-linked rubber composition or thermoplastic elastomer composition has improved compression set and moldability.

The invention relates to injectable self-healing hydrogel with conductivity and a preparation method thereof. The method comprises the steps that firstly, a methacrylic anhydride modified natural polymer is adopted, then, pyrrole is added into a modified natural polymer solution, stirring is performed for 1-3 h, then, an initiator is added, and after a reaction is ended, dialysis and freeze dryingare performed to obtain a polypyrrole grafted natural polymer; then, the polypyrrole grafted natural polymer is dissolved into ultra pure water, and then, due to the Fe3+ cross linking effect, the injectable self-healing hydrogel with the conductivity is prepared. The prepared self-healing hydrogel has the advantages of conductivity and injectability, the hydrogel can be implanted into the body in a minimally invasive mode, the irregular defect part is restored, and meanwhile wound healing is promoted. The injectable self-healing hydrogel has the potential application prospect in the field ofbiology medicine materials.

The invention discloses a preparation method of an edible collagen membrane. The method comprises the following steps: first, performing a reaction on animal collagen dissolved by an acetic acid solution and hydroxycarboxylic acid-N-hydroxysuccinimide ester, removing bubbles, performing film forming and drying to obtain a transparent collagen membrane, soaking the obtained transparent collagen membrane in a solution containing oxidase for a reaction, after the reaction is finished, performing washing by water and performing drying to obtain the edible collagen membrane. In the method provided by the invention, with the adoption of step-by-step crosslinking modification on a collagen membrane, the system is uniform in crosslinking, the membrane is more uniform and compact, and the crosslinking degree is higher, so that the tensile strength of the membrane can be greatly improved, and meanwhile, the membrane is transparent in color, and is more suitable for being used as a packaging material for highlighting the color of packaged objects. The method provided by the invention is simple in method and easy in operation and is easy for popularization and application.

The invention provides a conductive rubber material used for a flexible sensor as well as a preparation method and application of the conductive rubber material, and is applicable to the field of flexible sensors. The conductive rubber material is prepared from the following components in parts by weight: 100 parts of a rubber base body and 5 to 100 parts of conductive fillers, wherein the rubber base body is a rubber base body containing cis-1,4-isoprene structure; the conductive rubber material is prepared by dispersing the conductive fillers into a rubber material, radiating by electronic beams or gamma rays and crossly linking.

The invention relates to a parallel bundle-assembled overhead insulation cable and a production process thereof. The parallel bundle-assembled overhead insulation cable comprises compression conductors, the compression conductors are formed by twisting of circular carbon fiber yarns and irregular hard aluminum wires arranged at outer walls of the circular carbon fiber yarns, outer walls of the compression conductors are provided with insulating layers, the insulating layers are connected with connecting ribs, and the upper surfaces of the connecting ribs are provided with marking lines. The production process of the parallel bundle-assembled overhead insulation cable comprises wire drawing, wire twisting, extrusion molding, and crosslinking. The cable and the production process thereof are advantageous in that the production efficiency is high, the service lifetime is long, the overall cost is low, and the promotion is facilitated.