Acrylate emulsion polymers are widely used in paint printing, electrostatic flocking, fabric bonding, warp sizing and coating processing, etc. Acrylic esters with different properties also have their own differences due to the differences in raw materials and ratios used use.
1. Electrostatic flocking adhesive
Using electrostatic flocking process, different flocks can be planted on the base fabric to make flocked products with different styles. Acrylic electrostatic flocking adhesive has excellent adhesion to the base fabric flock, and the flocked products are wear-resistant and feel It is soft, water-resistant, solvent-resistant, breathable, and does not pollute the environment during use. Its use has been quite extensive. Typical examples are as follows, in which raw materials acrylic acid, methyl methacrylate, styrene, butadiene are reagent grade, emulsifier, sodium dodecylbenzenesulfonate is industrial grade, and potassium persulfate is reagent grade. First add 0.1 parts of styrene, 0.1 parts of butadiene, 2.0 parts of methyl methacrylate, 20 parts of acrylic acid, 160 parts of water, 0.5 parts of potassium persulfate, 0.1 parts of t-dodecyl mercaptan and twelve parts in the polymerization kettle 0.06 parts of sodium alkylbenzene sulfonate were reacted at 70 ° C, then 1.0 part of potassium persulfate, 48.9 parts of styrene, 39.9 parts of butadiene and 8.0 parts of methyl methacrylate were continued to react at 80 ° C for 1h, 90 ° C The reaction was carried out for 4 hours, and the material was finally filtered. The yield was 99%, the average particle size was 0.12 μm, with blue fluorescence, the solid content was 40 to 42%, the pH was 4 to 5, the viscosity was 0.05 to 0.08 Pa · s, and there was no precipitation for half a year. When flocking on cotton cloth and viscose fiber, it can be coated with 250g / m2, pre-baked at 120 ℃ for 5min, and baked at 150 ℃ for 6min.
2. Anti-migration agent
This anti-migration agent can use two or more monomers, such as acrylic acid, methacrylic acid, acrylamide and so on. Using acrylamide as the raw material, adding half of the NaOH solution, stirring at 40 ~ 50 ℃ to hydrolyze part of the amide group into a carboxyl group. The initiator is added slowly to prevent the polymerization reaction from being too violent. Before polymerization, molecular weight regulators such as mercaptoethylamine, dodecanethiol, etc. can be added to control the degree of polymerization.
3. Paint printing thickener
Thickener is an important component of paint printing compound, which can thicken the color paste, promote adhesion and have emulsifying effect, can improve the coloring amount and vividness of paint printing fabric, so that the fabric can obtain a clear outline pattern. The acrylate polymer commonly used in textile printing additives, printing thickeners, has a high viscosity at low solids, its stability is good, the thickening force is strong, it is not easy to mold, and it is widely used in electrostatic flocking adhesives. Paint printing adhesives and water-based paint thickeners, etc. A suitable preparation process is to add emulsifier and water to the reactor according to the ratio of 35 parts of acrylic acid, 70 parts of acrylate, 1 part of crosslinking agent, 4 parts of emulsifier, 0.3 parts of initiator, and 250 parts of deionized water. 1. Some monomers are stirred and emulsified at 80 ℃, and then some initiators are added to initiate the reaction, and the remaining materials are added dropwise to continue the reaction for 1.5 hours to obtain the finished product.
4. Textile warp sizing
Slurry acrylate slurry is composed of a homopolymer or copolymer mainly composed of acrylic acid, methacrylic acid and its esters, and a small amount of acrylic acid and (meth) lactenoate etc. which are partially saponified. The film formed by self-crosslinking acrylate emulsion has good wear resistance, high strength, good toughness, water resistance, and strong adhesion to nylon and polyester. Polyacrylate sizing is the main sizing of synthetic fibers and filaments. The first is the copolymer of acrylic acid and acrylic acid and salts. Now hard monomers such as methyl methacrylate are added for modification to improve The glass transition temperature of the copolymer, and the preparation method of its methyl ester slurry is emulsion polymerization of acrylic acid, ethyl ester and acrylic acid according to the ratio, in which benzoyl peroxide is used as the initiator, the amount is 1%, and it is active on the nonionic surface The reaction agent (1%) reacts at 80 ℃, the product is neutralized with ammonia water, the content of acrylic acid should be controlled at about 12%, and the solid content of the finished product is 14%.
Fifth, shrink-resistant finishing agent
When protein-containing fiber fabrics such as wool products are repeatedly squeezed, kneaded or stirred in water, the fibers will felt, entangle and move to the root.This shrinking phenomenon will cause the fabric area to shrink. The surface is pilling, the hand feels hard, and the performance deteriorates. The polyacrylate wool anti-shrinking agent with butyl acrylate as the main monomer can form a stable emulsion in water, which can improve the dyeing performance of the fiber and the shrink resistance of the fabric. A typical preparation method is to add 154 g of butyl acrylate, 21 g of acrylonitrile, 42 g of N-methylol acrylamide, and 2 g of ethyl methacrylate-2-sulfonate under stirring, add N-methylpyrrolidone, and heat and drop under nitrogen Add a mixture of 2g azobisisobutyronitrile and 30g acetone, and then remove the solvent to get the finished product.
6. Acrylate emulsion for coating
Coating finishing is a branch of textile finishing. By coating, the fabric has special properties. The acrylic coating agent with a solid content of 40% has good water pressure resistance and breathability.It has been widely used in polyester-cotton windbreakers and polyester Finishing the coating of cotton, nylon bone snow jacket fabric, etc., and adding flame retardant, it has flame retardant effect. The latex prepared by polymerization of ethyl acrylate, butyl ester, N-methylol acrylamide, etc. can be made into a foam coating agent by adding other additives, and used to cover curtains and cushion fabrics. 90 parts of butyl acrylate, 5 parts of acrylic acid, 10 parts of 2-methoxyethyl acrylate, 160 parts of water were added with stirring 0.15 part of dodecyl mercaptan, 3 parts of emulsifier, 5 parts of 2% K2S2O8 aqueous solution Polymer emulsion was prepared by polymerizing at 79 ℃ for 3h under nitrogen protection. In use, mix according to the proper ratio of fabric coating agent 50, water 30, thickener 4, defoamer and adjust the coating agent to pH 9-10 with an appropriate amount of ammonia.
Seven, fabric waterproofing agent
Silicone-modified acrylic emulsion is an emulsion polymer of organosilicon compound and acrylate. Its emulsion particle size distribution is uniform, emulsion stability is high, comprehensive performance of coating film is good, and waterproof performance can reach a high level. A typical production method of fabric waterproofing agent is to add 98 parts of butyl acrylate, branched acrylate, acrylonitrile, styrene, acrylic acid and other monomer components to 1-2 parts of internal crosslinking agent, 3 parts of composite emulsifier Mix it under rapid stirring to make a milky white emulsion. Take 40g of this emulsion at 80 ° C and add 2% potassium persulfate. Stir until it is blue. Then add the remaining emulsion and 2% potassium persulfate 15g dropwise After reacting in the solution for 2h, the temperature was lowered to 45 ℃ after completion of the reaction, and the emulsion was filtered.
