43results about How to "Cross-linking" patented technology

The present invention relates to a dynamic imine bond polysaccharide polymer-based injectable hydrogel and a preparation method and an application thereof. The dynamic imine bond polysaccharide polymer-based injectable hydrogel comprises the following raw material components in weight percentages: 5-18% of a component A: oxidized sodium alginate, 0.1-20% of a component B: a mixture of one or two of water-soluble chitosan and 3,3'-dithiobis(propanohydrazide), and the balanced solvent. The materials are prepared into an even solution according to the ratio. Compared with the prior art, "Schiff base", amide bonds and other dynamic imine bonds are used to realize cross-linking and can form a gel under mild conditions of human body temperature and acid and alkali, and no biotoxic initiators areneeded. The hydrogel is fast in gel-forming speed and injectable after forming. The hydrogel is mild in the preparation conditions, and excellent in compression properties, biocompatibility and injectability, and has broad application prospects in the field of cartilage repair.

The invention relates to the field of rubber, in particular to a fluororubber compound. The fluororubber compound is prepared from the following raw material components in parts by weight: 100 parts of raw fluororubber, 15 to 30 parts of carbon black filler, 10 to 20 parts of modified silica filler and 2.3 to 4 parts of vulcanizing agent, wherein the fluororubber is a mixture of ternary raw rubberand binary raw rubber; the ternary raw rubber is vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene or vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene-csm; the binary raw rubberis vinylidene fluoride-hexafluoropropylene or vinylidene fluoride-hexafluoropropylene-csm. The compound has wider temperature tolerant range and good tolerance to novel fuel or additive, and can be widely applied to sealing products for automobiles, spaceflight, chemical machines and the like.

The invention relates to a one-step preparation method of sodium carboxymethyl cellulose/polyethyleneimine (CMC/PEI) double-network hydrogel with a function of efficiently removing Cr (VI). The preparation method comprises the following steps: evenly stirring a CMC colloidal solution and a PEI solution so as to form a mixed colloidal solution, and then adding a crosslinking agent for carrying outa crosslinking reaction so as to obtain the CMC/PEI double-network hydrogel; the one-step preparation method, provided by the invention, of the CMC/PEI double-network hydrogel with the function of efficiently removing the Cr (VI) is simple and easy to control, low in cost, stable and reliable, and can effectively remove the Cr (VI); therefore, the CMC/PEI double-network hydrogel has a broad application prospect in the field of pollution control.

The invention relates to the field of functional materials, especially to a preparation method of a chitosan binder for formed activated carbon. The preparation method of the chitosan binder for formed activated carbon comprises the following steps: adding water to prepare aqueous acid, and weighing chitosan and dissolving chitosan in the aqueous acid to obtain a chitosan solution; stirring while adding a cross-linking agent into the chitosan solution; adding a proper amount of activated carbon into a reaction system; controlling temperature of the reaction system to 20-60 DGE C, and carrying out a cross-linking reaction on the mixed liquor for 1-2h under the condition of stirring, standing in the air for 2h and defoaming; and placing a reaction liquid obtained into a baking oven of 100-120 DEG C for 15-30 min, pouring the reaction liquid into a mold and drying. The technology is simple and convenient to operate. The binder is a hydrophilic binder. To some extent, water resistance, acid and alkali resistance and hydrophilic advantage performance are maintained in the prepared formed activated carbon.

The invention discloses a special rubber alloy elastomer for sealing members and a preparation method thereof. The special rubber alloy elastomer comprises the following raw materials in parts by weight: 40 to 60 parts of raw rubber of fluororubber, 5 to 20 parts of raw rubber of hydrogenated butadiene-acrylonitrile rubber, 5.01 to 50 parts of filling reinforcing agent, 0.3 to 2 parts of polyperfluoro isopropyl ether oil, 1 to 3 parts of zinc oxide, 0.6 to 1.4 parts of organic peroxides, 0.5 to 2.5 parts of triallyl isocyanurate, and 0.5 to 1 part of lubricant. During the preparation process, technologies of synthetic rubber preparation, moulding and vulcanization of rubber, post treatment, and examination are adopted, and the obtained special rubber alloy elastomer for sealing members has an excellent performance on resisting high temperature, low temperature, low pressure change, fuel oil, engine oil, acids, alkalines, and mixed oil gas, and has a long service life.

The invention discloses a crosslinkable naphthal-diimide-based all-polymer solar cell receptor material and a preparation method and application thereof. A ternary random polymer with different olefinic bond contents is prepared by adjusting the composition of monomers containing olefinic bonds and is subjected to high-temperature thermal treatment; also disclosed is how to acquire a crosslinked-structure active layer material at the premise of maintaining high photoelectric conversion efficiency in order to except to obtain an all-polymer solar device having high photoelectric conversion efficiency and excellent thermal stability; application in the field of organic solar cells is achieved. In addition, the preparation method is simple; the material acquired has better resistance to hightemperature and better thermal stability when applied to photovoltaic material active layers as compared to common polymer donor/receptor photovoltaic material active layers; therefore, the material herein can be applied to the field of all-polymer solar cells to provide significantly improved stability for devices.

The invention relates to the field of hydrogel, and discloses a composite hydrogel as well as a preparation method and an application thereof. The composite hydrogel is formed by cross-linking polysaccharides and nanoparticles in an aqueous medium, wherein the nanoparticles are nano silicon dioxide, nano-hydroxyapatite, particles containing the nano silicon dioxide or particles containing the nano-hydroxyapatite. The composite hydrogel, which takes the nanoparticles as physical cross-linking points, can a non-covalent bond effect with chain segments of the polysaccharides, so that cross-linking with the chain segments of the polysaccharides is realized. Experimental results show that the composite hydrogel, by mixing the nanoparticles, is relatively good in effects of promoting cell proliferation and accelerating wound healing. Moreover, the composite hydrogel provided by the invention can be generated under gentle conditions; and the preparation method is simple.

The invention belongs to the field of functional polymer composite material, which relates to a multi-layer perfluorinated cross-linking adulterated ionic membrane compounding micro-porous membrane and fiber. The ionic membrane is a multi-layer membrane with 2-40 layers formed by perfluorinated ion exchange resin with the EW value of 600-1300, wherein at least one layer has a cross-linking reticular structure, at least one layer is a reinforcing membrane with the micro-porous membrane being a reinforce, at least one layer is added in an anorganic adulterant with functions of water holding and proton exchange, at least one layer is added in the fiber as the reinforce, and at least one layer is added in high valence metallic compound and at least one layer is added in the fiber as the reinforce; and the multi-layer perfluorinated cross-linking adulterated ionic membrane adopts the methods comprising the cross linking of the micro-porous membrane, the reinforcing fiber and the chemical bonding, the physical exchange cross-linking of high valence metallic compound and acid exchange base group and the like, simultaneously the mechanical strength of the ionic membrane is greatly increased, and due to the existence of the transmitter substance of adjuvant proton, the electric conductivity of the obtained membrane under high temperature or low humidity is far higher than the electric conductivity of common ion exchange membrane.

The invention relates to a micro-porous membrane compounded multi-layer fluorine-containing cross-linking doped ionic membrane and a preparation method thereof. The membrane contains 2 to 40 layers, preferably 2 to 5 layers, formed by fluorine-containing ion exchange resin which has an EW value of 600 to 1300. The total thickness of the membrane is 10 to 300 microns. At least one layer of the membrane has cross-linked network structure; at least one layer of the membrane is filled with auxiliary proton transmitter substance; at least one layer of the membrane adopts micro-porous membrane as reinforcement; and at least one layer of the membrane is provided with high valence metallic compound. The micro-porous membrane compounded multi-layer fluorine-containing cross-linking doped ionic membrane of the invention has high mechanical intensity, increases the stability of the membrane on length, width and thickness directions, has high ion exchange capability and high conductivity, and can be applied to producing fuel cell.

The invention discloses an aminated starch-based nanocomposite and a preparation method thereof. The aminated starch-based nanocomposite comprises the following components in parts by weight: 100 parts of epoxidized polymer, 2-40 parts of aminated starch nanoparticles, 0-3 parts of auxiliary crosslinking agent and 3-25 parts of polymer processing aid, wherein the structural general formula of starch in the aminated starch nanoparticles is St-R0CH(R1)-R2. In the invention, through the combination of the aminated starch nanoparticles and the epoxidized polymer, the nano reinforcing effect of the starch nanoparticles on the polymer is remarkably embodied, and the polymer material is endowed with the green and environment-friendly features; and moreover, the aminated starch nanoparticles serve as a crosslinking agent in the epoxidized polymer. The aminated starch-based nanocomposite disclosed by the invention is easy to prepare and excellent in property and can be applied to various products such as rubber, plastics and adhesives.

The invention provides a proton exchange membrane as well as a preparation method thereof and application thereof in a proton exchange membrane fuel cell. The proton exchange membrane comprises 2-40 single-layer membranes taking perfluoro ion exchange resins as substrates, wherein at least one single-layer membrane is in a crosslinking reticulate structure, at least one single-layer membrane contains auxiliary proton conducting substances with surfaces modified, at least one single-layer membrane contains high-valent metallic compounds, and at least one single-layer membrane is a modified microporous membrane. The proton exchange membrane improves the proton conducting property and also greatly enhances the mechanical strength of ionic membranes in a way of physical bonding crosslinking formed by the modified microporous membrane, chemical bonding crosslinking, the high-valent metallic compounds and acidic exchange radicals.

The invention relates to a fiber-reinforced multi-layer cross-linked doped perfluorinated ion-exchange membrane and a preparation method thereof, belonging to the field of functional polymer composite materials. The perfluorinated ion-exchange membrane comprises a multi-layer structure and is simultaneously doped with reinforcing fibers and auxiliary proton conducting substances, and the cross-linking reaction is carried out under certain conditions, thereby forming the ion-exchange membrane with the dual-network structure formed by chemical bonding and cross-linking and physical bonding and cross-linking between high valent metal compounds and acidic exchange groups. The prepared ion-exchange membrane has high proton conductivity and high dimensional stability.

The invention relates to a fiber composite multi-layer total fluoride crosslinking ionic membrane and a preparation method thereof, which belongs to the field of functional polymer composite materials. The fluorine-containing ion exchange membrane is in a double-net structure with chemical bonding crosslinking and physical bonding crosslinking of a high valent metallic compound and an acidic exchange group and simultaneously contains reinforced fiber. The prepared ion exchange membrane has higher dimensional stability and good mechanical strength.

The invention belongs to the technical field of high polymer materials, and relates to a POSS enhanced high-mehcanical-property silicone rubber and a preparing method thereof. The silicone rubber comprises silicone rubber, white carbon black, hyperbranched POSS, hydrogen-containing silicone oil and a platinum catalyst. By adding the hyperbranched POSS and the white carbon black, the synergetic enhancement effect is realized for the silicone rubber; by adding crosslinking points of the silicone rubber and regarding the concentrated crosslinking as the crosslinking mode, the remarkable effect isrealized for the mechanical property enhancement of the silicone rubber. By means of the POSS enhanced high-mehcanical-property silicone rubber, the tube breakage risk of thin silica gel catheters (peripherally inserted central catheters, tear drainage tubes, lumbar cistern drainage tubes and the like) can be reduced, corresponding complications are reduced, and secondary surgical injuries and medical disputes are avoided.

The invention discloses a method for preparing crosslinking waterborne acrylic emulsion. The method comprises the following steps that A, a modified dialdehyde crosslinking agent is prepared, wherein the general formula of the dialdehyde crosslinking agent is CHO-R-CHO, R is an alkyl group of a linear chain or branched chain or an aryl group of a linear brain or branched chain; B, acrylate copolymer emulsion containing amino functional groups is prepared; C, the modified dialdehyde crosslinking agent obtained in the step A is added into the acrylate copolymer emulsion obtained in the step B, the crosslinking waterborne acrylic emulsion is obtained, and the crosslinking reaction equation is 2P-NH2+CHO-R-CHO-P-N=H-R-CH=N-P+H2O. An obtained crosslinking film has good abrasion resistance, chemical resistance, water resistance and tensile strength, and the problem of yellowing is successfully solved.

The invention relates to a polyurethane-polyurea aqueous dispersion and a preparation method and an application thereof, the polyurethane-polyurea aqueous dispersion contains carbodiimide groups, and the carbodiimide groups can be subjected to chemical cross-linking reaction with carboxyl groups existing in a system in the later use process, so that adhesion is improved, and the service life of the polyurethane-polyurea aqueous dispersion is prolonged. A silane coupling agent with a tertiary amine group is gathered outside emulsion particles, and plays a self-crosslinking role in a later hydrolysis process, so that the crosslinking density and hydrophobic property of a coating are improved, and meanwhile, the mechanical property of a coating film is not changed. The polyurethane-polyurea aqueous dispersion disclosed by the invention has excellent storage stability and can be used in the field of polyurethane textile printing.

The invention belongs to the field of polymer dielectric materials, and discloses a solvent-resistant high-dielectric-constant insulating layer material capable of being simply and conveniently patterned and a preparation method of the solvent-resistant high-dielectric-constant insulating layer material. By adding polar groups into a polymer, dipole polarization in the material is increased, so the purpose of increasing the dielectric constant of the polymer is achieved; a prepolymer can be cured into a film through a photocuring technology by introducing a group with photoreaction activity, and a fine pattern with a specific shape can be formed by controlling exposure conditions; and the preparation of the anti-solvent polymer is realized at a relatively low temperature. The whole preparation process for preparing the insulating layer polymer is simple and time-saving, high-temperature curing is not needed, and the method can be widely applied to roll-to-roll printing and manufacturing of flexible thin film transistors.