Study On Preparation Of Acrylate Polymer Emulsions And Their Related Applications

Acrylate copolymer emulsions are the products of acrylate or methacrylate which reacts with other vinyl esters through emulsion polymerization. At present, copolymer emulsions of (meth)acrylate, vinyl acetate/(meth)acrylate and styrene/(meth)acrylate are the most to be uesd. Acrylate polymer emulsions are widely uesd in coatings, adhesives and so on because of their good lightfastness, acid-alkali resistance and corrosion resistance. However, there exist many drawbacks such as poor water resistance, flexibility and durability when acrylate polymer emulsions are used as liquid of polymer-cement waterproof coatings, which has a great influence on the waterproof performance of polymer-cement waterproof coatings. Improvement of polymer emulsion properties is vital to emulsion paints with ultra-low VOC content. There is contradiction between film-forming stability of polymer emulsion and mechanical property of the formed film. In order to coordinate film-forming stability of polymer emulsion and mechanical property of film, a volatile organic solvent has to be added into emulsion paints, which leads to higher VOC content, when acrylate polymer emulsions are applied as a binder of emulsion paints. Two types of acrylate polymer emulsions were prepared, which was used in the polymer-cement waterproof coating and architectural emulsion paints resptctively. They are obtained through the way of pre-designing particle and property of polymer, introducing a small quantity of functional monomer, selecting emulsification systems and initiation systems and emulsion polymerization technology. They can raise the ratio of permormance to price of polymer-cement waterproof coatings and decrease VOC content in emulsion paint. Therefore, there are great meanings in theory and practice.Acrylate polymer emulsion, which was used to manufacture polymer-cement waterproof coating, was prepared with pre-emulsified semi-continuous seeded emulsion polymerization technology. A proper quantity of functional and active crosslinking monomer was added during the couse of emulsion polymerization, and water-resistant monomer was added into the acrylate emulsion. The experimental results show that added functional monomer and adopted polymerization technology improve polymerization stability greatly, and that added active crosslinking monomer and water-resistant monomer improve durability and water resiatance of polymer emulsion. Rheological property of acrylate emulsion was studied. The research results show that polymer emulsion belongs to non-Newtonian fluid, and has the rheological property of pseudoplasric fluid.The weight ratio of self-made polymer emulsion to Portand cement and the different kind of assistant, which had an effect on the tensile property, water resistance and flexibility at low...