17 results about "Emulsion copolymerization" patented technology

The invention relates to the technical field of PC resin flexibilizers, and discloses a shell-core structure styrene-acrylic resin modified organic silicon elastomer flexibilizer as well as a preparation method and application thereof in order to solve the problems that an organic silicon material and PC resin are poor in intersolubility, a traditional flexibilizer is poor in low-temperature toughening performance and the like. Comprising the following steps: uniformly mixing hydrogen-containing silicone oil, vinyl silicone oil, a third alkenyl functional component and a catalyst, and pre-emulsifying under the action of a surfactant and a thickener to obtain an organic silicon pre-emulsion SiE; uniformly mixing an alkenyl phenyl compound, acrylate and / or a cross-linking agent, adding a molecular weight regulator and an oil-soluble initiator, and pre-emulsifying under the action of a surfactant and water to obtain a styrene-acrylic pre-emulsion SAE; the preparation method comprises the following steps: firstly, preparing an organic silicon pre-emulsion, then heating the organic silicon pre-emulsion to carry out a water-phase hydrosilylation addition reaction, then dropwise adding the styrene-acrylic pre-emulsion to carry out suspension emulsion copolymerization, and then demulsifying and drying to obtain the styrene-acrylic resin modified organic silicon elastomer toughening agent with the core-shell structure.

The invention relates to a hydrophilic acrylic pressure-sensitive adhesive. The pressure-sensitive adhesive comprises an acrylic copolymer, polyvinyl alcohol or a derivative thereof, a non-reactive surfactant and a neutralizer according to the solid content of an emulsion, the acrylic copolymer is obtained by copolymerization of n-butyl acrylate, 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, acrylic acid, methyl methacrylate and a boric acid functional monomer emulsion containing a 2, 1-benzoxaborazole group. The preparation method comprises the following steps: dropwise adding a pre-emulsion, lagging dropwise adding an initiator and carrying out thermal-insulation polymerization to obtain a copolymer emulsion, adding polyvinyl alcohol or a derivative thereof at a specific temperature, neutralizing to a specified pH value, and carrying out segmented drying to form the film. The hydrophilic acrylic pressure-sensitive adhesive disclosed by the invention has both hydrophilicity and wet stability while keeping the adhesion performance.

The invention discloses high-flame-retardant low-VOC (volatile organic compound) acrylic acid composite resin and a preparation method thereof. The method comprises the following steps: reacting a melamine resin prepolymer, ammonium polyphosphate and a charring catalyst in an acidic water phase to prepare a microencapsulated synergistic flame retardant with a core-shell structure; then pentaerythritol, phosphorus oxychloride and hydroxyethyl methylacrylate are subjected to a reaction to synthesize a reaction type phosphorus flame-retardant monomer; finally, the monomer, methyl methacrylate, butyl acrylate, acrylic acid and the microencapsulated flame retardant are subjected to emulsion copolymerization in a water phase, and target resin is prepared. Through the synergistic effect of double mechanisms of reactive flame retardance and microencapsulation synergistic flame retardance, the limit oxygen index of the resin is larger than or equal to 32%, and flame-retardant components are stable and do not migrate; a water phase system is adopted in the whole process, the VOC source is controlled from the source, and the VOC content of the product is lower than 40 g / L. The obtained resin has excellent flame retardance, environmental protection property and good mechanical property, and is suitable for the field of high-end coatings and adhesives.

This invention relates to the field of waterproof coatings, specifically to a waterproof coating and its preparation method; comprising: 40 to 70 parts of functionalized polymer emulsion, 10 to 30 parts of pigments and fillers, 1 to 3 parts of film-forming aid, 0.2 to 0.5 parts of defoamer, and 10 to 20 parts of water; as the core material, the above-mentioned functionalized polymer emulsion is prepared by in-situ soap-free emulsion copolymerization process using multiple polymer monomers, including a multifunctional fluorosilicone modified monomer; the multifunctional fluorosilicone modified monomer has a triazine ring structure framework, and 2-(perfluorohexyl)ethoxy, 2-(methacryloyloxy)ethoxy, and 3-(triethoxysilyl)propylamino are respectively attached to the three carbon atoms of this framework; this invention can significantly improve the adhesion of the coating to the substrate, while the triazine ring framework enhances the stability of the overall molecular structure, greatly improving the waterproof effect and weather resistance of the coating.

The present application relates to PC resin toughening agent technical field, aiming at the problems of poor mutual solubility of organic silicon material and PC resin, poor low-temperature toughening performance of traditional toughening agent, etc., the present application discloses a kind of shell-core structure phenylpropene resin modified organic silicon elastomer toughening agent and its preparation method and application, including the following steps: hydrogen-containing silicone oil, vinyl silicone oil, third alkenyl functional component and catalyst are uniformly mixed, pre-emulsification is carried out under the action of surface active agent and thickening agent, and organic silicon pre-emulsion SiE is obtained;Another alkenyl phenyl compound, acrylic ester and / or crosslinking agent are uniformly mixed, then molecular weight regulator and oil-soluble initiator are added, pre-emulsification is carried out under the action of surface active agent and water, and phenylpropene pre-emulsion SAE is obtained;Then, organic silicon pre-emulsion is heated first to carry out water-phase silicon hydrogenation addition reaction, then phenylpropene pre-emulsion is added dropwise to carry out suspension emulsion copolymerization, then demulsification, drying, and the shell-core structure phenylpropene resin modified organic silicon elastomer toughening agent can be obtained.

This invention relates to an aqueous copolymer emulsion (1) suitable for gas-liquid mass transfer to reduce VOCs, wherein the copolymer emulsion (1) is a copolymer based on: a) 1 wt.% to 99.5 wt.% methyl methacrylate (MMA), b) 0 wt.% to 20 wt.% of one or more hydrophilic monomers with a water solubility greater than 0.3 g / 100 cm3, and c) 0 wt.% to 99 wt.% of one or more hydrophobic monomers with a water solubility of 0.3 g / 100 cm3 or less, wherein the copolymer emulsion (1) comprises d) 0.2 wt.% to 20 wt.% of one or more stabilizers, wherein the content of the hydrophilic monomer b) or the hydrophobic monomer c) is at least 0.5 wt.%, and wherein at least 5 wt.% of the methyl methacrylate a) (MMA) is recycled methyl methacrylate (2r, rMMA), and the remainder is standard methyl methacrylate (2s, MMA). A method for emulsion copolymerization of recycled methyl methacrylate (2r, rMMA) to obtain a low-VOC water-based copolymer emulsion (1a), the water-based copolymer emulsion (1a) obtainable according to said method, and the use of the obtained low-VOC water-based copolymer emulsion (1a) are also claimed.

The invention discloses a multifunctional battery diaphragm, a preparation method thereof, an electrochemical device and application, and belongs to the technical field of battery diaphragms. The multifunctional battery diaphragm comprises a base membrane and functional coatings coated on the two sides of the base membrane, the functional coatings comprise microsphere binders, inorganic particles and functional auxiliaries, and the microsphere binders are composed of acrylate monomers, divinyl benzene monomers, 4, 4 '-divinyl benzene monomers, 2, 4'-divinyl benzene monomers, 2, 4 '-divinyl benzene monomers, 2, 4'-divinyl benzene monomers and 2, 4 '-divinyl benzene monomers. The polymer is prepared from 4, 4 '-biphenyl diacrylate and 1-(3-sulfo propyl)-2-vinylpyridine inner salt through emulsion copolymerization reaction. The two sides of the base membrane are coated with the functional coatings, the functional coatings comprise the microsphere binder, the inorganic particles and the functional additive, and the quadripolymer serves as the microsphere binder and acts together with the inorganic particles and the functional additive, so that the diaphragm has excellent peel strength, electrolyte wettability and high temperature resistance.

The invention discloses a water-based acrylic adhesive and a preparation method thereof, and relates to the technical field of adhesives. When the water-based acrylic acid adhesive is prepared, firstly, polyether glycol, isophorone diisocyanate, bisphenol A glycerol diacrylic acid, N, N-bis (2-ethoxyl) aminomethylene diethyl phosphonate, polyethylene glycol and ethidene diamine are used as raw materials, and a polyurethane acrylate emulsion is prepared through polymerization, chain extension and emulsification; secondly, vinyl boric acid and m-digallic acid react to synthesize vinyl gallic acid borate, and then vinyl gallic acid borate, butyl acrylate, methyl methacrylate, 2, 2, 3, 3, 3-pentafluoropropyl acrylate and other monomers are subjected to emulsion copolymerization to prepare water-based polyacrylate; and finally, mixing the polyurethane acrylate emulsion, the water-based polyacrylate and a photoinitiator to prepare the water-based acrylic acid adhesive. The water-based acrylic acid adhesive prepared by the preparation method disclosed by the invention has excellent adhesive property, water resistance, flame retardance and oxidation resistance.

The invention relates to a well wall enhancer and a preparation method thereof, and belongs to the technical field of oilfield chemistry and well drilling. The preparation method comprises the following steps: carrying out emulsion copolymerization on carbon-carbon double bond modified styrene-butadiene latex, a silane coupling agent containing carbon-carbon double bonds, N-alkenyl pyrrolidone, an emulsifier containing carbon-carbon double bonds and a cross-linking agent in a water phase; wherein 9-30 g of a silane coupling agent containing a carbon-carbon double bond, 4-15 g of N-alkenyl pyrrolidone, 6-10 g of an emulsifier containing a carbon-carbon double bond and 0.02-0.1 g of a cross-linking agent are correspondingly used for every 100 g of the carbon-carbon double bond modified styrene-butadiene latex. The silane coupling agent containing the carbon-carbon double bonds, the N-alkenyl pyrrolidone and the emulsifier containing the carbon-carbon double bonds are grafted on the carbon-carbon double bond modified styrene-butadiene latex, and cross-linking polymerization is performed through the cross-linking agent, so that a multi-element synergistic effect is realized, and the adhesion film-forming property, the temperature resistance and the hydrophobicity of the well wall reinforcing agent on the well wall are enhanced.

The invention relates to a polyacrylate coating, a preparation method thereof, a battery and an electric device. The polyacrylate coating is prepared from the following raw material components in parts by weight: 40 to 70 parts of acrylate copolymer emulsion, 10 to 25 parts of flame-retardant filler, 0.5 to 5 parts of adhesion promoter and 10 to 45 parts of water, the acrylate copolymer emulsion is prepared by emulsion copolymerization of an acrylate monomer, an alkyl ester monomer, a nitrogen-containing monomer and a phosphorus-containing monomer in the presence of an initiator, and an emulsifier adopted in emulsion copolymerization comprises a phosphorus-containing anionic emulsifier and a nitrogen-containing nonionic emulsifier; the chain length of alkyl in the alkyl ester monomer is C10-C18. The polyacrylate coating has good damping and flame retardant properties.

This invention discloses a fatigue-resistant rubber for automotive inner tubes and its preparation method, relating to the field of rubber materials technology. The invention involves copolymerizing olefinic carbon nanotubes into polymethyl methacrylate (PMMA) chains to prepare carbon nanotube-modified PMMA. Using PMMA as the shell, and polybutyl acrylate (PBMA) as the core, modified core-shell particles are prepared through emulsion copolymerization. These modified core-shell particles are then added to an inner rubber matrix to prepare the inner layer rubber. An outer rubber layer is prepared by grafting maleic anhydride onto chlorosulfonated polyethylene rubber. The grafting of maleic anhydride introduces carboxyl groups, which form covalent bonds with adjacent layers through a chemical reaction. The adhesive layer is a composite of chlorinated polyethylene and epoxy resin, extruded using a multi-layer co-extrusion process, and then co-cured to prepare the fatigue-resistant rubber for automotive inner tubes. Co-curing allows the molecular chains of the three rubber layers to form a three-dimensional interpenetrating network through a crosslinking agent, tightly binding them through chemical bonds and completely eliminating the risk of interlayer delamination.

The present application relates to the technical field of oil and gas well cementing engineering, and particularly relates to a cementing cement microcrack self-repairing material, a preparation method and application thereof. The cementing cement microcrack self-repairing material is prepared by using an emulsion copolymerization method, and the raw material composition comprises the following components in parts by weight: deionized water 30 parts, monomer 3-12 parts, crosslinking agent 0.03-0.09 parts, initiator 0.06-0.3 parts, natural latex 3-20 parts, surfactant 1.5-3 parts, and filler 0.03-1.5 parts. The self-repairing material obtained by the present application has high liquid absorption rate in a weak acid solution, high swelling rate in the presence of carbon dioxide, and excellent mechanical properties. The self-repairing material can be added into a cementing fluid system, and is used in the environment of supercritical CO2 and CO2 formation water, two kinds of corrosive media in a water-wet environment, to seal the leakage channel of a wellbore and improve the sealing integrity of the wellbore.

The application discloses a liquid type super-high cation water purifying agent for treating mine wastewater, which is prepared by stably dispersing AM-DM oil emulsion copolymer and PDM homopolymer in an oily solvent under the action of an emulsifier; the water purifying agent comprises the following components: 11-15 parts of AM-DM oil emulsion copolymer containing AM-DM copolymer, 60-65 parts of PDM homopolymer, 2-3 parts of emulsifier, and the rest is an oily solvent; the AM-DM oil emulsion copolymer is obtained by emulsifying the AM-DM copolymer in the oily solvent. The super-high cation water purifying agent can improve the molecular weight and viscosity of the water purifying agent product, and can also keep the stability and uniformity of the super-high cation charge density, is used for treating mine wastewater, can significantly improve the treatment effect, makes the supernatant of the treated wastewater clear and transparent, can greatly reduce the treatment cost, and has a positive market application value.

The invention relates to the field of waterproof coatings, in particular to a waterproof coating and a preparation method thereof. Comprising the following components in parts by weight: 40-70 parts of functionalized polymer emulsion, 10-30 parts of pigment filler, 1-3 parts of a coalescing agent, 0.2-0.5 part of a defoaming agent and 10-20 parts of water, as a core material, the functional polymer emulsion is prepared from various polymeric monomers including multifunctional fluorosilicone modified monomers through an in-situ soap-free emulsion copolymerization process; the multifunctional fluorosilicone modified monomer has a triazine ring structural skeleton, and three carbon atoms of the skeleton are respectively connected with 2-(perfluoro-n-hexyl) ethyoxyl, 2-(methacryloyloxy) ethyoxyl and 3-(triethoxysilyl) propylamino; the adhesive force of a coating to a base material can be remarkably improved, the stability of the overall molecular structure is enhanced through a triazine ring framework, and the waterproof effect and weather resistance of the coating are greatly improved.

This invention relates to the field of sludge dewatering agent preparation technology, specifically to an environmentally friendly polymeric sludge dewatering agent and its preparation method. A quaternary ammonium salt structure is introduced into the gelatinized starch molecular chain to obtain modified cationic starch. Using an emulsion copolymerization method, the modified cationic starch, methacryloyloxyethyltrimethylammonium chloride, and modifying additives are grafted and copolymerized to obtain a pretreated polymer. Then, modified fillers are introduced through covalent bonds to obtain the environmentally friendly polymeric sludge dewatering agent. The dewatering agent has both positive and negative charges on its surface. The positive charge can combine with negatively charged organic suspended matter, while the negative charge can accelerate the settling of inorganic suspended matter. The inorganic silica-alumina skeleton and metal-organic framework support the floc structure, forming large and dense flocs, thus increasing the settling velocity. Simultaneously, the long-chain alkanes on it enhance the interaction between polymer molecular chains through hydrophobic association, improving adsorption bridging and flocculation effects.

The application relates to the technical field of silicone toughening agents, in particular to a long-chain alkyl modified silicone toughening agent and a preparation method thereof. The long-chain alkyl modified silicone toughening agent is prepared by the thiol-double bond reaction between vinyl silicone oil and long-chain alkyl mercaptan to prepare long-chain alkyl silicone oil, then the long-chain alkyl silicone oil is hydrolyzed under certain temperature conditions to synthesize a silicone emulsion, and long-chain alkyl is preliminarily obtained; then a first mixed emulsion liquid, which is obtained by mixing acrylate soft monomers, octadecyl methacrylate, functional monomers, an emulsifier and an initiator, is added dropwise; a second mixed emulsion liquid, which is obtained by mixing acrylate hard monomers, functional monomers, an emulsifier and an initiator, is added dropwise; emulsion copolymerization reaction is carried out; long-chain alkyl is obtained again; an interpenetrating network system is formed; the weather resistance and temperature stability of the polymer are improved; the molecular weight of the polymer is greatly increased; the toughness of the polymer is good; the toughening effect on plastic materials is greatly improved; the low-temperature toughening property is particularly good; and the amount of the toughening agent in alloy materials can be reduced.

This invention discloses a modified tea saponin-based antifouling emulsion, its preparation method, and its application. The method includes: firstly, grafting C12-C22 long-chain unsaturated acyl chlorides, acid anhydrides, or isocyanates onto tea saponin molecules using a one-pot method to prepare unsaturated modified tea saponin monomers; then, semi-continuous emulsion copolymerizing these monomers with styrene, (meth)acrylate, and functional carboxylic acid monomers. This invention anchors the antifouling active sites of tea saponin to the polymer backbone via covalent bonds, combining the steric hindrance and repulsion forces generated by the long carbon chains in seawater with their lipid affinity and penetration effect on the cell membranes of attached organisms, achieving synergistic antifouling through physical anti-adhesion and biochemical inhibition. This invention overcomes the shortcomings of traditional physically additive antifouling agents, such as easy leaching and short-lasting antifouling effects. It does not release heavy metals and has the advantages of long-lasting effect, being environmentally friendly, and having a simple process, showing broad application prospects in the field of marine antifouling.