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

The invention discloses an ultraviolet curing pressure-sensitive adhesive containing ultraviolet cross-linked tackifying resin and a preparation method thereof, and belongs to the field of high-molecular compounds. The ultraviolet curing pressure-sensitive adhesive comprises ultraviolet cross-linked acrylate copolymer tackifying resin, a monofunctional acrylate monomer and a photoinitiator. The preparation method comprises the following steps: mixing an ultraviolet active monomer, a soft monomer, a hard monomer and a thermal initiator to obtain a mixed solution a of which the total volume is v; adding 0.3v of mixed solution a to a reaction kettle, adding a solvent, stirring, heating and reacting to obtain a mixed solution b; dropwise adding 0.7v of mixed solution a to the mixed solution b at a constant speed, reacting and carrying out reduced pressure distillation; and adding the monofunctional acrylate monomer and the photoinitiator, and mixing evenly to obtain the ultraviolet curing pressure-sensitive adhesive, wherein the ultraviolet curing pressure-sensitive adhesive contains the ultraviolet cross-linked acrylate copolymer tackifying resin; and ultraviolet cross-linking of the tackifying resin is realized, so that the comprehensive property of the ultraviolet curing pressure-sensitive adhesive is excellent; and the method is simple, and simple and convenient to operate.

The invention belongs to the technology of synthetic leather materials and the field of manufacturing of synthetic leather and particularly relates to composite modified waterborne polyurethane synthetic leather. The waterborne polyurethane synthetic leather comprises modified waterborne polyurethane emulsion which is used as a composition component of slurry of a base layer and a surface layer; the waterborne polyurethane emulsion comprises 100 parts of diisocyanate, 200-300 parts of polyether or polyester polyol, 12-20 parts of alcohol chain extender, 3-10 parts of waterborne epoxy resin emulsion, 1-5 parts of crosslinking agent, 5-10 parts of organopolysiloxane, 8-20 parts of hydrophilc agent, 10-20 parts of neutralizer, 50-100 parts of solvent and 400-1,000 parts of deionized water. According to the composite modified waterborne polyurethane synthetic leather, with the waterborne epoxy resin emulsion as the crosslinking agent, by adding organopolysiloxane, the formed waterborne polyurethane emulsion has a three-dimensional grid structure, and the elasticity of the waterborne polyurethane emulsion is improved; secondly, for the formation of the grid-shaped structure, by improving connection strength among adjacent molecules, the surface strength of the formed waterborne polyurethane synthetic leather product is improved.

The invention provides cross-linked polymer gel and a preparation method thereof. The cross-linked polymer gel is coupled by a cross-linked polymer and a cross-linking agent; and by the joint action of the cross-linked polymer and the cross-linking agent, the joint of acid liquor is realized under the normal temperature. The cross-linked polymer gel has better temperature stability and cut-resistant property, thus realizing the lower filtering loss of the acid liquor and the reaction speed of acid rocks under the reservoir stratum condition and improving the acid-fracturing effect and the economic effect. The invention conducts a test according to the industrial standard SY / T5764-1995, SY / T6214-1996 by the fracture and acidification research center of oil extraction technique research institute of China Petroleum Shengli Oil Field Company Limited, and the test result displays that all indexes achieve the industrial standard.

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 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 belongs to the field of lithium ion batteries, and in particular relates to a cross-linked gel polymer electrolyte and a preparation method thereof. The invention provides a cross-linked gel polymer electrolyte, which is obtained after the blended cross-linked polymer film fully absorbs the electrolyte; wherein, the blended cross-linked polymer film is made of a polymer substrate, PS- PEO-PS tri-block copolymer and solvent are firstly prepared by electrospinning, and then cross-linked by Friedel-Crafts reaction; wherein the mass fraction of PS-PEO-PS tri-block copolymer in the blend system is 1 % to 60%, the blending system is a blending system of a polymer substrate and a PS-PEO-PS tri-block copolymer. The polymer electrolyte obtained by the invention has high ion conductivity and other excellent electrochemical properties.

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 an acridine compound, a polymer, an application thereof, and a light-emitting device. The structural formula of this acridine compound is shown in formula (I): wherein, n 1 ~n 4 independently choose 0 or 1, and n 1 ~n 4 Not 0 at the same time; D 1 ~D 4 are independently selected from: a substituted or unsubstituted arylene group, or a substituted or unsubstituted heteroarylene group. In the invention, the acridine unit connected by spiro structure is used as the core, the arylene group and the heteroaryl group are used as the arms, and the vinyl unit is used as the terminal to construct the acridine compound. The compound is soluble in conventional solvents at room temperature, and due to the electron-donating conjugation of the nitrogen atom in the acridine unit, the electron cloud density of the entire acridine unit is relatively high, making it a good unit for transporting holes; its terminal It is a vinyl unit, cross-linked at high temperature to form a cross-linked layer that is not easily soluble in conventional solvents, and is not easily dissolved by the solvent of the next functional layer, which is beneficial to improve the luminous efficiency.

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 relates to a multi-layer cross-linking ion membrane generated from perfluor ion-exchange resin, belonging to the field of functional polymer composite materials. At least one layer of the multi-layer cross-linking ion membrane has a cross-linking reticular structure, and at least one layer of the multi-layer cross-linking ion membrane contains high-valence metallic compounds; moreover, high-valence metallic compounds are added to the multi-layer cross-linking ion membrane, so that the high-valence metallic compounds and the acidic exchanging groups in the resin can physically bonded. Accordingly, the invention further improves the stability and mechanical properties of the multi-layer cross-linking ion membrane and particularly improves the performance in gas permeation prevention.

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 canbe applied to producing fuel cell.

The invention provides a laminated silicon dioxide microsphere and a preparing method thereof. The preparing method is simple, and the laminated silicon dioxide microsphere can be prepared within 3-4h. A hydroxyl compound coats the surface of silicon dioxide through the hydroxylation effect, then in the emulsification process, through a dispersing agent, mutual cementation of coated silicon dioxide is effectively avoided, and the dispersity is improved; then through the further utilization of emulgator, the surface tension of coated silicon dioxide is lowered, a protection layer can be formedon the surface of coated silicon dioxide, and cohesion of coated silicon dioxide is further prevented. Under the effect of a catalyst, the hydroxyl compound coating the surface of silicon dioxide issubjected to an aldolization reaction with an aldehyde group cross-linking agent, cross-linking of the aldehyde group cross-linking agent and the hydroxyl compound is achieved, and then a product which is obtained through the aldolization reaction of the cross-linking agent and the hydroxyl compound is formed on the surface of silicon dioxide.

The invention discloses a preparation method of a cross-linked water-based acrylic emulsion. It comprises the following steps: A, preparation of modified dialdehyde cross-linking agent; the general formula of said dialdehyde cross-linking agent is CHO-R-CHO, wherein R is a linear or branched alkyl group, or linear or branched The aryl group of chain; B, prepare the acrylate copolymer emulsion containing amino functional group; C, add the modified dialdehyde cross-linking agent that A step gains in the acrylate copolymer emulsion that B step gains, obtain cross-linked aqueous acrylic acid emulsion , the cross-linking reaction formula is: 2P‑NH 2 +CHO‑R‑CHO→P‑N=CH‑R‑CH=N‑P+H 2 O. The cross-linked coating film obtained by the invention has good abrasion resistance, chemical resistance, water resistance and tensile strength, and successfully solves the problem of yellowing.