202 results about "Emulsion copolymerization" patented technology

The invention discloses a method for preparing fluorine hydrophobic oil-repellent fabric finishing agent, wherein the finishing agent is lacte emulsion with blue fluorescence. And the preparation comprises that using fluorine monometer, hydrocarbons unsaturated monometer, acid monometer and functional monometer as material, with inducer, adjusting agent, buffer agent and emulsifier, via emulsion polymerization method to be composed to obtain needed finishing agent. The inventive finishing agent has better hydrophobic oil-repellent effect, high stability and high yield, or the like.

This invention relates to waterborne coating compositions having improved compatability with metal pigments, i.e., improved shelf life and reduced gassing and gellation. The compositions comprise at least one aqueous dispersion of (1) at least one emulsion copolymer polymerized from (a) at least one ethylenically unsaturated anionic monomer and (b) at least one other olefinically unsaturated monomer, said copolymer being made using at least one phosphate surfactant having at least one phosphorus acid group or salt thereof, said copolymer being crosslinked, and (2) at least one non-water soluble metal pigment. The compositions are useful in paints and other coatings.

Disclosed are an acrylate emulsion modified by one or more acryloxyalkoxysilanes with a controllable latex particle shape, and a preparation method and application thereof. The emulsion of the present invention is obtained by the emulsion copolymerization of (meth)acryloyloxyalkoxysilane and acrylic acid hydrocarbyl ester, and it is not necessary to use methacrylate monomers with high volatility and toxicity, styrene and unsaturated acids. other types of unsaturated monomers. Using the relationship of the reactivity ratio in the reaction kinetics, by controlling the entry of the reaction raw materials, copolymers with different latex particle morphological structures can be obtained through emulsion polymerization. The copolymerization method is simple in operation, low in cost and environmentally friendly. The polymer product thus obtained has significantly improved certain mechanical properties. The emulsions can be used in buffer coatings, adhesives, sealants, gaskets, inks, and cleaning agents. The sealant made with this emulsion has good stability and can be placed stably for more than one year at room temperature. It can be widely used in sealing, coating and bonding of automobiles, building materials, daily products, etc.

The present invention discloses silicon-containing (methyl) acrylate monomer and its copolymer and their preparation process. The silicon-containing (methyl) acrylate monomer as silane or silane oligomer with methyl propenyl acyloxy radical or propenyl acyloxy radical is prepared through the catalytic reaction of silane coupler with (methyl) propenyl acyloxy radical, and hexamethyl disilane or hexamethyl disilane and active organosilicon under the action of catalyst. The present invention also discloses one kind of silicon-containing (methyl) acrylate copolymer and its solution copolymerization, water emulsion copolymerization and ultraviolet curing process. The copolymer has excellent adhering performance, waterproof and antifouling performance and weather resistance.

The present invention relates to a fluorine-contained ultrabranched polyacrylate which can be used in water-proofing oil-proofing fabric finishing agent and its preparation method. Said method includes the following steps: using hydroxyterminated ultrabranched polyester as reaction substrate, adopting 'direct method' or 'indirect method' to modifying its hydroxyl end group into polymerizable active double bond, then adding perfluorinated acyl chlroide or esters, and making it and residual hydroxyl end group of said ultrabranched polyester implement esterification reaction; finally making part of its terminal group form into acrylate double bond and making its another part form into perfluoroalkyl so as to obtain the fluorine-contained ultrabranched polyacrylate. Then said fluorine-contanied ultrabranched polyacrylate and hydrocarbon (methyl) acrylate are undergone the process of emulsion copolymerization so as to obtain the water-proofing oil-proofing fluorine-contained fabric finishing agent emulsion.

The invention discloses a coating film with the large moisture permeability. The coating film comprises a basic film layer and a coating layer, wherein the basic film layer is an expanded polytetrafluoroethylene film layer; the coating layer coating the expanded polytetrafluoroethylene film layer is a polyurethane emulsion copolymerization coating layer containing superfine micro-powder of hemp stalk cores; a coating agent of the polyurethane emulsion copolymerization coating layer containing the superfine micro-powder of the hemp stalk cores is prepared by uniformly stirring the following raw materials in percentage by weight: 20-25% of polyurethane; 55-60% of a dimethylfomamide solvent; 2-5% of a hydrophilic group solvent and 18-25% of the superfine micro-powder of the hemp stalk cores. Through the manner, the coating film has good moisture absorbing and guide performances; the content of moisture permeable factor fibrin in the superfine micro-powder of the hemp stalk cores is large; micro-grooves and micropores exist in the coasting film, so that the moisture absorption area and the diffusion area are increased; the coating film has excellent performances such as ultraviolet resistance, water proofing, dust proofing, oil proofing, moisture permeability and corrosion resistance on oxide solutions.

The invention discloses a synthesis method of an organic silicon modified acrylate copolymer by using an emulsion copolymerization method. The synthesis method comprises the following steps: (1) synthesizing organic silicon seed emulsion: adding emulsifier and deionized water according to a proportion in a formula into a three-mouth flask provided with a stirrer, a dropping funnel and a reflux condensing tube by using a semicontinuous dropping method, adjusting the bath temperature to 75 DEG C, then, adding catalyst and dropwise adding organic silicon monomers, and after the dropwise adding is finished, introducing nitrogen gas for 30 minutes; reacting for 5 hours, slowly cooling, adjusting the pH value of the system to 7-8 by using 10% sodium carbonate solution and standing the solution for 12 hours; and (2) carrying out graft copolymerization by using acrylic ester monomers: dropwise adding acrylic ester monomers and initiator by also adopting the semicontinuous dropping method after adjusting the reaction temperature to 75 DEG C, and introducing nitrogen gas for 30 minutes; reacting for 5 hours, adjusting the pH value to 7-8 by using ammonia water; and discharging. The synthesis method is simple in process, efficient and environment friendly, the organic silicon content of the prepared emulsion is over 50%, and no agglomeration is generated.

A polymerization process to copolymerize hydrophobic ethylenically unsaturated C₄-C₃₀. J olefins with polar monomers such as acrylates is described. The process utilizes an acid source to modify/catalyze the reactivity of the polar monomer and/or radically activated repeat unit from the polar monomer to promote incorporation of the ethylenically unsaturated olefin. The copolymer shows excellent adhesion to a variety of polymeric and/or polar substrates such as polyolefins, acrylatc coatings, wood, etc.

The invention discloses polymer emulsion and a preparation method thereof. The polymer emulsion is characterized by using hard monomer, soft monomer and crylic acid as polymer monomers, using crylic acid long-chain alkyl ester as modified monomer, using polymerizable organosilicon emulsifier PMSC as the emulsifier of the system and using thermal decomposition initiator as the initiator to obtain high-performance polymer emulsion by semi-continuous type emulsion copolymerization. The polymer emulsion obtained by the method has favorable waterproofness, water resistance, weather resistance, adhesiveness and film coating effect, and can be widely used as paint, adhesive, fabric waterproof agent, and the like, thereby having bright development potential.

The invention discloses a preparation method of a double self cross-linking elastic emulsion. The method combines two post cross-linking modes: (1) adding multivalent metal ion compounds to carry out cross-linking reactions; (2) adding diacetone acrylamide into emulsion so as to make diacetone acrylamide participate in the emulsion copolymerization reactions during the emulsion polymerization process so as to introduce keto-carbonyl groups into the chains of copolymer, and then adding binary caprylic hydrazide such as adipic dihydrazide into the emulsion so as to obtain the self cross-linking elastic emulsion. A diacetone-acrylamide and binary caprylic hydrazide cross-linking system and a carboxylic acid and multivalent metal salt cross-linking system are both simultaneously induced into an acrylate emulsion polymerization system to replace an elastic emulsion system formed trough a single reactive cross-linking agent; thus the polymerization property and storage stability of emulsion are improved, the waterproof property, contamination resistant property, after-tack property, and elastic elongation rate of the surface of a coating coated by the elastic emulsion are all improved; and the coating product which adopts the two room temperature self cross-linking systems, has a good adhesive force and elasticity, and has a very good surface waterproof property.

The invention relates to a preparation method of a fluorine-containing polyacrylate soap-free emulsion. According to the invention, the fluorine-containing polyacrylate soap-free emulsion is prepared by adopting an amphiphilic segmented copolymer polyacrylic acid-b-polyhexafluorobutyl acrylate (PAA-b-PHFBA) to substitute a routine emulsifier, and carrying out soap-free emulsion copolymerization on acrylate monomers, and can be applied to the leather field, the textile field, the coating field, the papermaking field, the adhesive field and the like. The compatibility of the hydrophobic segment of the used PAA-b-PHFBA and above prepolymerization monomers is good, so a problem of bad compatibility of fluorine-containing monomers is solved, thereby the stability of the emulsion polymerization process is substantially improved. Additionally, the PAA-b-PHFBA is anchored to emulsion particles in the emulsion polymerization, and the hydrophilic segment stretches into a water phase to stabilize the emulsion particles through an electrostatic effect and a steric hindrance effect, so the storage stability and the freeze-thaw resistance stability of the emulsion are improved, disadvantages of bad adhesion, bad water resistance and bad solvent resistance of films of common emulsions are overcome, and the mechanical properties, the adhesion and the abrasive resistance of the film of the emulsion are improved.

The present invention relates to a stable organosilicon modified copolymer emulsion and its preparation method. Said copolymer emulsion is made up by uisng monomer containing olefine and siloxane and vinyl monomer containing no siloxane through the emulsion copolymerization initiated by free radical in the presence of hydrolysis inhibitor, protective colloid and pH buffer. In the copolymer, the ratio of siloxane monomer can be up to 35%, and its polymerization process also can be normally implemented, and the obtained emulsion is stable, so that the obtained coating film is superior to that of similar copolymer emulsion with low siloxane content in water-proof property, resistance to contamination, adhesive force and weatherability. It is applicable to preparation of latex paints for cement base material, mosaic and tile, also can be used for preparing lacquer and coating paint, etc.

A pasty copolymer resin of chloroethylene-vinyl acetate is prepared through under the protection of surfactant dispersing the chloroethylene monomer and vinyl acetate monomer in water by use of high-speed pump or slowly stirring to form fine liquid drips, polymerizing at 40-65 deg.C under the action of trigger system to obtain copolymer latex with 0.1-2.0 microns glanularity, and spray drying. Its advantages are better paste-forming performance and good low-temp plasticity.

Pressure-sensitive adhesive compositions that resist water-whitening are provided. The compositions comprise emulsion copolymers formed from a plurality of monomers that includes a plurality of (meth)acrylic monomers, at least one trifluoroalkyl(meth)acrylate monomer, and at least one alkylimidazolidone (meth)acrylate monomer. Preferably, the (meth)acrylic monomers comprise a plurality of soft monomers, at least one hard monomer and at least one acid monomer. The plurality of monomers may further include at least one aliphatic urethane di(meth)acrylate, an oligomer. The pressure-sensitive adhesive composition also comprises a surfactant system including at least one surfactant.

The invention discloses a resin emulsion for a water-borne wood paint and a preparation method thereof. The resin emulsion and the preparation method thereof are characterized in that: firstly, vinyl versatate is introduced to a prescription and is subjected to an emulsion copolymerization reaction together with alkyl methacrylate and other functional monomers; secondly, an emulsion polymerization process for intermittently feeding is adopted; and each polymerized emulsion particle comprises four layer from the inside to the outside, namely an inner core, an outer core, an inner casing and an outer casing respectively; and thirdly, an inner casing reaction material and an outer casing reaction material contain diacetone acrylamide and other cross-linking agents; and in the drying and film-forming process of the water-borne paint, the diacetone acrylamide and other cross-linking agents are subjected to a cross-linking reaction with adipic dihy drazide so as to form a compact body form netlike structure. According to the water-borne wood paint prepared from the resin emulsion, the water resistance, heat resistance and hardness of a paint film can be remarkably improved.

The present invention relates to an acrylic impact modifier having a multilayered structure, which offers both superior impact resistance and coloring characteristics to engineering plastics, such as polycarbonate (PC) and a polycarbonate/polybutylene terephthalate alloy resin, or to a polyvinyl chloride resin. The present invention provides an acrylic impact modifier having a multilayered structure comprising: a) a seed prepared by emulsion copolymerization of a vinylic monomer and a hydrophilic monomer; b) a rubbery core surrounding the seed and comprising a C₂ to C₈ alkyl acrylate polymer, and c) a shell surrounding the rubbery core and comprising a C₁, to C₄ alkyl methacrylate polymer, a method for preparing the same, and a thermoplastic resin comprising the same.

The invention discloses a novel water-based ink binder self-crosslinking emulsion for flexographic printing and a preparation method of the novel water-based ink binder self-crosslinking emulsion. Theself-crosslinking emulsion is a copolymer emulsion prepared from the following components through emulsion copolymerization, by weight, 30-70 parts of deionized water, 5-35 parts of water-based resin, 2-40 parts of alkyl acrylate monomer with the total carbon number being 4-12, 0-25 parts of methacrylate monomer with the total carbon number being 5-10, 0-25 parts of a styrene monomer, 0.2-5 partsof a hydroxyl (meth)acrylate monomer, 0.5-5 parts of a crosslinking monomer, 0.01-0.5 part of a metal ion crosslinking agent, 0.01-0.1 part of an initiator and 0-10 parts of a pH regulator. The water-based ink binder self-crosslinking emulsion can be subjected to a self-crosslinking reaction at room temperature, and has excellent resolubility, water resistance and printing transfer performance.

The invention discloses a POSS modified styrene-acrylic emulsion copolymer, a preparation method and application. The copolymer comprises the following components in parts by weight: 40 to 60 parts of deionized water, 15 to 20 parts of styrene, 15 to 20 parts of butyl acrylate, 3 to 5 parts of an emulsifying agent, 2 to 7 parts of POSS, 1 to 2 parts of a water-soluble initiator, 0.1 to 0.3 part of a pH value conditioning agent and 3 to 5 parts of other auxiliaries. As an exterior wall coating material, the POSS modified styrene-acrylic emulsion obtained in the invention has the advantages of low surface tension, high pollution resistance and high self-cleaning performance. In the copolymer, an Si-O-Si bond can be formed by POSS and the wall, so that the adhesive force of the styrene-acrylic emulsion as the exterior wall coating is improved.

The invention discloses a polymer dispersion and a preparation method thereof. The polymer dispersion is obtained through the soap-free emulsion copolymerization technology. The polymer dispersion comprises a negative ion monomer, a non-ionic monomer, a pH buffering agent, an initiator, an antalkali and water, wherein the negative ion monomer accounts for 3-10 parts of the raw materials, the non-ionic monomer accounts for 10-25 parts of the raw materials, the pH buffering agent accounts for 0.3-1.0 part of the raw materials, the initiator accounts for 0.3-2 parts of the raw materials, and the water accounts for 100 parts of the raw materials. A proper amount of the antalkali is used for adjusting the pH value of a reaction system to range from 6.0 to 9.0. The obtained polymer dispersion is used as a dust depressor, an effective shell can be formed on the surface of dust, and the construction safety and application safety of the polymer dispersion are higher. The polymer dispersion is applied as the chemical dust depressor, can be diluted with water to be sprayed for use, and is good in overall performance, safe and environmentally friendly.

The invention discloses a method for preparing a polymer retanning fat-liquoring agent and the retanning fat-liquoring agent. The preparation method comprises the following steps of: preparing long-chain fatty alcohol maleic acid monoester by adopting C8-C18 long-chain fatty alcohol and maleic anhydride, preparing the long-chain fatty alcohol maleic acid monoester into long-chain fatty alcohol maleic acid monoester salt, and then dripping methacrylic acid octadecyl ester, aqueous solution of sodium methacrylate and aqueous solution of initiator into the long-chain fatty alcohol maleic acid monoester salt to perform aqueous emulsion copolymerization to form the polymer retanning fat-liquoring agent. The polymer retanning fat-liquoring agent contains terpolymer of the methacrylic acid octadecyl ester, the long-chain fatty alcohol maleic acid monoester and the methacrylic acid. The preparation method saves an organic solvent during synthesizing the retanning fat-liquoring agent so as to reduce environmental pollution, and meanwhile overcomes the defect of insufficient fat-liquoring performance of a long-chain fatty alcohol maleic acid monoester and methacrylic acid copolymer by introducing oleophilic methacrylic acid octadecyl ester monomer into the polymer.

The invention relates to a preparation method of an acrylonitrile-butadiene rubber, belonging to a manufacturing method of a high-molecular compound by copolymerizing butadiene and acrylonitrile. The acrylonitrile-butadiene rubber is prepared by carrying out cold-process intermitted emulsion polymerization on the raw materials butadiene and acrylonitrile. The method is characterized in that the acrylonitrile-butadiene rubber has the following technical indexes: the Mooney viscosity is 30-95, the acrylonitrile monomer content accounts for 18-46 wt%, the degree of swelling is 20-50%, and the tensile strength is 10-22 Mpa. The invention provides an acrylonitrile-butadiene rubber with different acrylonitrile contents and excellent oil resistance and physical and mechanical properties and a preparation method thereof. The reaction temperature and the butadiene-acrylonitrile monomer ratio are regulated and controlled by using the unique emulsion system, redox system, monomer feeding mode and technological conditions; and the acrylonitrile and butadiene are subjected to emulsion copolymerization to obtain the acrylonitrile-butadiene rubbers with different acrylonitrile contents. The acrylonitrile-butadiene rubber prepared by the method has favorable oil resistance; and the method is suitable for preparing acrylonitrile-butadiene rubber raw materials required by various oil-resistant rubber products.