Silicone - Acrylic Emulsion Preparation And Research

In this paper, the research and development of emulsion polymerization, involving organosilicon modified acrylate latexes, was reviewed. The organosilicon-acrylate latexes with the content of 2% and 6% silicon were prepared, respectively. Organosilicon-acrylate latex containing 2% of silicon was studied and optimized. A N-hydroxymethylacrylamide self-crosslinking latex and an organosilicon-acrylate latex with content of 2% of A-174 were prepared. The structure and properties of those different copolymers synthesized with emulsion polymer were characterized by infrared spectroscopy, thermal graviting analysis and differential scanning calorimetry. The mechanical and hydroscopicity tests confirmed that the silicon modified acrylate polymers possess higher heat-resistance, waterproof ability and toughness compared to the pure acrylate based polymers. With synthesizing organosilicon-acrylate latex containing 6% of silicon, the orthogonal experiment method was applied to select the best results. The pilotscale experiments for the two kinds of latexes were carried out and the products obtained showed a very good quality, and satisfied with all the criterions established by National Standards of China.Using a semi-batch synthesizing technique, a "core-shell" composite latex of siloxane-acrylate based copolymer was obtained, besides, the reaction temperature of the system was effectively lowered by the redox initiating system. The mechanical and hydroscopicity tests indicated that the heat-resistance, waterproof ability and toughness of the pure acrylate latex can be greatly improved by creating a special "core-shell" type of organosilicon-acrylate copolymer.