51 results about "Emulsion copolymerization" patented technology

The invention belongs to the technical field of synthetic resin, and particularly relates to a high-transparency weather-resistant PMMA (polymethyl methacrylate) resin toughening agent with a core-shell structure and a preparation method of the PMMA resin toughening agent. The preparation method comprises the following steps: preparing core-layer latex from an acrylate monomer and a vinyl aromatic monomer through emulsion copolymerization, then preparing a shell layer with the refractive index completely consistent with that of PMMA resin on the surface of the core-layer latex through graft polymerization, and finally preparing the PMMA resin toughening agent with the core-shell structure. The toughening agent can effectively toughen the PMMA resin on the premise that the light transmittance of the PMMA resin is not lower than 85%, so that the elongation at break of the PMMA resin is remarkably improved, and the film drawing requirement of the PMMA resin can be met.

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 belongs to the technical field of coatings and polymer materials, and discloses a weather-resistant easy-to-clean fluorosilicone modified acrylic anti-doodling coating and a preparation method thereof. The preparation method comprises the following steps: carrying out hydrosilylation reaction on hydrogen-containing silicone oil, allyl polyoxyethylene ether and perfluoroalkyl ethylene in the presence of an anhydrous solvent and a catalyst to obtain polyether modified fluorine-containing silicone oil; mixing the polyether modified fluorine-containing silicone oil with (methyl) acryloyloxyethyl isocyanate and an organic tin catalyst for reaction to obtain polyether modified fluorine-containing silicone oil containing double bonds; and carrying out emulsion copolymerization reaction on the fluorine-silicon modified acrylic acid, an acrylic monomer and an acrylate monomer to obtain the weather-resistant easy-to-clean fluorine-silicon modified acrylic acid anti-doodling coating. The preparation method is simple in process and easy to control, the hydrophobic, oleophobic and easy-to-clean effects of a coating film are remarkably improved by introducing a fluorine-containing chain segment and a polysiloxane chain segment, and the adhesive force, the strength and the weather resistance of the coating film are remarkably improved through reasonable cross-linked structure design.

The invention relates to the technical field of organic silicon toughening agents, in particular to a long-chain alkyl modified organic silicon toughening agent and a preparation method thereof.The long-chain alkyl modified organic silicon toughening agent is prepared through sulfydryl double-bond reaction of vinyl silicone oil and long-chain alkyl mercaptan, organic silicon hydrolysis is conducted under a certain temperature condition to synthesize silicon emulsion, long-chain alkyl is preliminarily obtained, and the long-chain alkyl modified organic silicon toughening agent is prepared. Then dropwise adding a first mixed emulsion obtained by mixing an acrylate soft monomer, octadecyl methacrylate, a functional monomer, an emulsifier and an initiator, dropwise adding a second mixed emulsion obtained by mixing an acrylate hard monomer, a functional monomer, an emulsifier and an initiator, and carrying out emulsion copolymerization reaction to obtain a long-chain alkyl group again to form an interpenetrating network system; compared with the prior art, the weather resistance and temperature stability of a polymer are improved, the molecular weight of the polymer is greatly improved, the polymer has good toughness, the toughening effect on a plastic material, especially the low-temperature toughening effect, is greatly improved, and the dosage of a toughening agent in an alloy material can be reduced.

The invention relates to the technical field of oil and gas well cementation engineering, in particular to a well cementation cement stone micro-crack self-repairing material and a preparation method and application thereof. The well cementation cement stone micro-crack self-repairing material is prepared from the following raw materials in parts by weight: 30 parts of deionized water, 3 to 12 parts of monomer, 0.03 to 0.09 part of cross-linking agent, 0.06 to 0.3 part of initiator, 3 to 20 parts of natural latex, 1.5 to 3 parts of surfactant and 0.03 to 1.5 parts of filler, and is prepared by adopting an emulsion copolymerization method. The obtained self-repairing material is high in liquid absorption rate in a weak acid solution, high in expansion rate when meeting carbon dioxide and excellent in mechanical property, can be doped into a well cementation fluid system, is used for two corrosive medium environments of supercritical CO2 and CO2 formation water in a water wet environment, seals a shaft leakage channel, and improves the sealing integrity of a shaft.

The present invention belongs to the technical field of coatings and polymer materials, and discloses a weather-resistant and easy-to-clean fluorosilicone modified acrylic anti-graffiti coating and a preparation method thereof. The preparation method comprises: subjecting hydrogen-containing silicone oil, allyl polyoxyethylene ether and perfluoroalkylethylene to a silylation reaction under anhydrous solvent and catalyst conditions to obtain a polyether-modified fluorosilicone oil; subjecting the polyether-modified fluorosilicone oil to a mixed reaction with (meth) acryloyloxyethyl isocyanate and an organic tin catalyst to obtain a polyether-modified fluorosilicone oil containing a double bond; and then subjecting the polyether-modified fluorosilicone oil to an emulsion copolymerization reaction with an acrylic monomer and an acrylate monomer to obtain a weather-resistant and easy-to-clean fluorosilicone modified acrylic anti-graffiti coating. The preparation method of the present invention has a simple process and is easy to control. The hydrophobic and oleophobic easy-to-clean effect of the coating is significantly improved by introducing a fluorine-containing segment and a polysiloxane segment, and the adhesion, strength and weather resistance of the coating are significantly improved by a reasonable cross-linking structure design.

The invention belongs to the field of fluorine-containing resin, and relates to tetrafluoroethylene and perfluoroalkyl vinyl ether copolymer resin and a preparation method thereof. The resin is prepared by adopting a fluorine-containing emulsifier as shown in a formula (1) to carry out tetrafluoroethylene and PAVE monomer emulsion copolymerization in a water-based medium and then carrying out condensation, washing and drying on the emulsion, the structure of the emulsifier is as shown in a general formula (1) Rf1 (OCF2) x-(ORf2) y-OCF (CF3) COOA, in the formula (1), Rf1 is a perfluoro linear alkyl group with the carbon number of 1-2, Rf2 is a perfluoro linear or side chain alkyl group with the carbon number of 2-3, x and y are respectively and independently 0 or 1, and x and y are respectively and independently 0 or 1. X and y are not 0 simultaneously, A is hydrogen atom, alkali metal or NH4, and the residual quantity of the fluorine-containing emulsifier in the formula (1) in the resin is lower than 0.2 ppm.

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 belongs to the technical field of high-molecular polymers and functional coatings, and discloses a high-adhesion heat-resistant water-sealing coating emulsion as well as a preparation method and application thereof. The high-adhesion heat-resistant water-sealing coating emulsion is prepared from a (methyl) acrylate monomer, a (methyl) acrylic monomer, an organic silicon monomer and a specific acrylate modified cyclodextrin compound cross-linking agent through emulsion copolymerization. After being mixed with metallocene, a polyethylene wax emulsion, an anti-scraping agent and a matt powder filler, the epoxy resin can be used for preparing a heat-sealing-resistant coating of a PE film, and the obtained coating has good adhesive force, water resistance and heat sealing performance.

The invention belongs to the technical field of chloroprene rubber preparation, and provides a method for preparing cold-resistant chloroprene rubber by changing the regularity of a chloroprene rubber molecular chain structure through monomer copolymerization. The preparation method comprises the following steps: adding a redox initiator at the emulsion polymerization temperature of 40 + / -0.2 DEG C to initiate a free radical emulsion copolymerization reaction, controlling the conversion rate of chloroprene monomers, adding a terminating agent to terminate the reaction when the polymerization degree is reached, removing unparticipated reaction monomers in the emulsion, acidizing and demulsifying latex, freezing and drum forming a film, and drying to obtain the high-cold-resistance chloroprene rubber emulsion. The technical innovation point of the chloroprene rubber is that the cold resistance of the chloroprene rubber is improved through copolymerization of chloroprene and unsaturated double-bond esters, and the defect that the performance of the chloroprene rubber is influenced by the difference of the use conditions of the chloroprene rubber is overcome. The poor cold resistance of common chloroprene rubber is improved, and the combination of excellent mechanical property and vulcanization property of the chloroprene rubber is maintained.

The invention relates to the field of battery materials and adhesives, and discloses a lithium ion battery silicon-carbon negative electrode water-based adhesive as well as a preparation method and application thereof. The binder comprises a first component carboxymethyl cellulose, a second component solution copolymer and a third component emulsion copolymer, and according to the solid content, the mass ratio of the first component to the sum of the second component and the third component is 1: 0.5-1: 5. The binder is endowed with excellent mechanical properties, stability, electrolyte affinity and energy efficiency by adjusting the proportion of all the components and designing functional groups. A water-based polymerization system is adopted, so that the compatibility of the components and the stability of the slurry are ensured. In addition, the binder does not contain toxic organic solvents and meets the environmental protection requirement, the preparation method is simple and convenient, raw materials are easy to obtain, and the binder has the remarkable economical advantage.

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.

The present invention discloses an aqueous primer for a polymer polyvinyl chloride film, a preparation method thereof, and an application thereof in a PVC wire harness tape. The aqueous primer comprises components A, B, and C. By weight, it comprises: 44-65 parts of component A, 35-56 parts of component B, and 2.7-4 parts of component C; Component A: an acrylic synthetic emulsion prepared by emulsion copolymerization of monomers such as methyl methacrylate, ethyl methacrylate, butyl methacrylate, styrene, acrylonitrile, methacrylic acid, acrylic acid, 2-ethylhexyl acrylate, butyl acrylate, isobutyl acrylate, ethyl acrylate, vinyl acetate, etc. Component B: at least one of natural rubber latex, synthetic rubber latex, and their modified latexes. Component C: an auxiliary agent. The auxiliary agent is mainly composed of a wetting agent, an antifoaming agent, etc. Compared with the current oil-based primer, the aqueous primer uses water as the main solvent, does not contain organic solvents, is environmentally friendly, and is not flammable because the main component is water, making it safer to use.

The invention relates to the field of lithium battery diaphragms, and discloses a polyacrylate aqueous dispersion, a cellulose-based reinforced diaphragm as well as a preparation method and application of the cellulose-based reinforced diaphragm. The polyacrylate aqueous dispersion comprises a component A and a component B, the component A is obtained by solution copolymerization of a polar monomer, the component B is obtained by emulsion copolymerization of a non-polar monomer and a polar monomer, and the mass ratio of the component A to the component B is 1: 0.5-1: 2. The cellulose-based reinforced diaphragm is composed of a cellulose membrane base material and a reinforced coating, and the coating is a polyacrylate aqueous dispersion and is coated on at least one surface of the cellulose membrane base material. The diaphragm is excellent in mechanical performance, heat resistance and electrolyte affinity, the thermal shrinkage rate is as low as 0-2%, the electrolyte absorption rate is higher than 140%, the diaphragm is suitable for improving the stability of a lithium battery structure, the cycle life is prolonged, and the safety performance and the energy efficiency of the battery are remarkably improved. The material and the solvent are environment-friendly, and the preparation method is simple and suitable for large-scale application.

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.

Waterborne vinyl acetate-acrylic, “vinyl acrylic” emulsion copolymers which can be used in architectural coatings and impart stain resistance to such coatings are provided. The vinyl acrylic emulsion copolymer particles in the emulsion may contain one or more particle size modes, each with a respective narrow particle size distribution. The vinyl acrylic emulsion copolymers contain as a comonomer an ethylenically unsaturated monomer and also contain a hydrolyzable silane comonomer. The hydrolyzable silane may be present as a comonomer in the vinyl acrylic copolymer and / or may be added to the vinyl acrylic emulsion copolymer emulsion in the form of a hydrolyzable silane that may have a reactive group that is capable of reacting with the vinyl acrylic copolymer.

The invention belongs to the technical field of PVDC emulsion preparation, and particularly relates to water-based PVDC with high thermal stability and a preparation method of the water-based PVDC. Comprising a component A and a component B. During application, the component A and the component B are mixed for use; the component A is a PVDC-based emulsion system prepared by taking vinylidene chloride (VDC), methyl methacrylate (MMA) and a modified epoxy monomer as comonomers; the component B is a thermal stability enhanced functional emulsion system prepared by uniformly blending 2, 2 '-aza-bis (2-imidazoline) dihydrochloride, glycidyl methacrylate, bisphenol A type liquid epoxy resin and polyether amine; a polyether amine polyamine structure is used for absorbing hydrogen chloride decomposed by the PVDC emulsion, chain reaction with poor thermal stability caused by hydrogen chloride removal is terminated in time, and meanwhile, a small amount of vinyl epoxy monomer and a small amount of bisphenol A type liquid epoxy resin in PVDC emulsion copolymerization form a co-crosslinking structure to enhance the strength of a coating film.

The invention provides a preparation method of a high-stability fluorine silicon selenium polyether emulsion for a lithium battery diaphragm, and belongs to the technical field of polymer emulsions. The emulsion is prepared by copolymerization of emulsions of perfluoropolyether (methyl) acrylic acid, styrene, acrylic acid and the like, and an organic fluorine surfactant and a free radical initiator are introduced in the polymerization process, so that the stability of the emulsion is improved. The emulsion can be uniformly coated on the surface of a polypropylene or polyethylene diaphragm, and a compact and stable coating is formed after drying, so that the heat resistance, flame retardance and lithium dendrite puncture inhibition capability of the diaphragm are remarkably improved, and the safety performance of a lithium battery is improved.

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.

The invention discloses a method for preparing a novel fluorine-containing polymer refrigerant through copolymerization of R142b and VDF, and belongs to the technical field of fluorine-containing polymers and refrigerants. The method comprises the following steps: firstly, carrying out precise pretreatment on R142b and VDF raw materials to improve the purity, then carrying out an emulsion copolymerization reaction under the action of a persulfate initiator and under the conditions of specific temperature, pressure and stirring, and carrying out demulsification, washing and drying on a reaction product to obtain the fluorine-containing polymer refrigerant. The core of the invention is to break through the mindset of the traditional small molecule refrigerant, and the high polymer material with refrigeration and lubrication functions is innovatively prepared through copolymerization reaction. When the product is applied to a refrigeration system, the wear rate of a compressor can be obviously reduced by more than 35%, the refrigeration efficiency is improved by more than 8%, and meanwhile, the product has the advantages of low volatility and good environmental protection property. The process is stable, the raw material utilization rate is high, and a novel refrigerant solution which is high in performance, long in service life and environmentally friendly is provided for the refrigeration industry.

This invention discloses a multilayer composite encapsulation material and its preparation method, as well as a flexible OLED display. The method includes: emulsion copolymerization to form a polyacrylate copolymer containing fluorine, double bonds, silane, and hydroxyl functional monomers; chemically bonding KH-570 modified nano-silica material into a polymer network using in-situ polymerization to prepare a composite emulsion; finally, forming an organic encapsulation layer through slot coating combined with UV-thermal dual curing, and alternately constructing alumina and alumina inorganic barrier layers using atomic layer deposition technology to form a multilayer organic-inorganic composite structure. This invention, through the synergy of molecular design, nanocomposite technology, and multilayer construction, enables the encapsulation material to possess ultra-low water vapor permeability (<10). ‑6 g / m 2 With its high flexibility, strong interface adhesion, and excellent thermal stability, it effectively solves the water and oxygen sensitivity problem of flexible OLED components and is suitable for packaging high-end flexible display devices.

The invention discloses a liquid type ultra-high cationic water purifying agent for treating mine wastewater. The liquid type ultra-high cationic water purifying agent is mainly prepared by stably dispersing an AM-DM oily emulsion copolymer and a PDM homopolymer in an oily solvent under the action of an emulsifier, the water purifying agent comprises the following components in parts by weight: 11-15 parts of an AM-DM oily emulsion copolymer containing an AM-DM copolymer, 60-65 parts of a PDM homopolymer, 2-3 parts of an emulsifier and the balance of an oily solvent, the AM-DM oily emulsion copolymer is obtained by emulsifying an AM-DM copolymer through an oily solvent. The ultrahigh cationic water purifying agent can maintain the stability and uniformity of the ultrahigh cationic charge density while improving the molecular weight and viscosity of the water purifying agent product, and can significantly improve the treatment effect when being used for treating mine wastewater, so that the supernatant of the treated wastewater is clear and transparent, and the treatment cost can be greatly reduced; the positive market application value is realized.

The application discloses a waterproof and oil-proof high-viscosity adhesive and a preparation method thereof, and relates to the technical field of adhesives. The application carries out cation exchange among modified polyacrylic acid emulsion montmorillonite interlayers, improves the dispersibility and stability of the montmorillonite, participates in the construction of the three-dimensional network structure among polyvinyl acetate polymer molecules together with vinyltriethoxysilane, enhances the cohesion and tensile strength of the adhesive, and introduces Si-O-Si bonds, further improves the waterproof and oil-proof performance and strength of the adhesive. The modified polyacrylic acid emulsion is prepared by emulsion copolymerization of N-hexyl-N-methyl acryloyloxy-N,N-dimethylammonium bromide, (1-allyl-1H-benzimidazole-2-yl)methanol and acrylic acid; the longer chain segment is introduced, so that water molecules are repelled outside the material surface, and the waterproof and oil-proof performance of the adhesive is enhanced; benzimidazole can form a protective film on the bonding surface, prevents oxygen, water and other media from contacting, and thus realizes the waterproof and oil-proof effect.

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 present invention relates to a water-based copolymer emulsion (1) suitable for undergoing a gas-liquid mass transfer for VOC-reduction, wherein the copolymer emulsion (1) is based on a copolymerizate of a) 1 to 99.5 wt.% of methyl methacrylate (MMA), b) 0 to 20 wt.% of one or more hydrophilic monomers having a water-solubility of more than 0.3 g / 100 cm3, and c) 0 to 99 wt.% of one or more hydrophobic monomers having a water-solubility of 0.3 g / 100 cm3 or less, wherein the copolymer emulsion (1) comprises d) 0.2 to 20 wt.% of one or more stabilizers, wherein the content of either 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 regenerated methyl methacrylate (2r, rMMA) and the remainder is standard methyl methacrylate (2s, MMA). Claimed is also a process of emulsion copolymerizing regenerated methyl methacrylate (2r, rMMA) to obtain a low-VOC water-based copolymer emulsion (1a), a water-based copolymer emulsion (1a) obtainable according to said process, as well as the use of the obtained low-VOC water-based copolymer emulsion (1a).

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 provides a preparation method of a fluorinated polyimide micro-powder reinforced perfluoroether elastomer, a perfluoroether elastomer composite material and a preparation method thereof, and belongs to the field of high polymer materials, and the preparation method specifically comprises the following steps: preparing a polyamide acid solution; carrying out thermal imidization reaction on the polyamide acid solution to prepare fluorinated polyimide micro powder; activating the purified fluorinated polyimide micro-powder in an alkaline environment, and carrying out surface grafting reaction on the activated fluorinated polyimide micro-powder and perfluorovinyl ether halide to obtain surface grafting modified fluorinated polyimide micro-powder; and carrying out emulsion copolymerization reaction on the surface-grafted and modified fluorinated polyimide micro-powder to obtain the fluorinated polyimide micro-powder enhanced perfluoroether elastomer emulsion, and a fluorinated polyimide micro-powder enhanced perfluoroether elastomer, a preparation method of the fluorinated polyimide micro-powder enhanced perfluoroether elastomer, a perfluoroether elastomer composite material and a preparation method of the perfluoroether elastomer composite material. According to the treatment scheme, the mechanical property and the high-temperature resistance of the perfluoroether elastomer are remarkably improved, and the perfluoroether elastomer is suitable for high-end applications such as sealing and corrosion-resistant coatings in an extreme environment.

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.