Abstract: The title silicone-acrylate emulsion was prepared by seeding emulsion technique, using organic siloxane intermediate which was synthesized by tetramethyl tetravinyl cyclotetrasiloxane(Vi-D4)via ring-opening polymerization and acylic monomers. Effect of pH, method of monomers charging, amount of emulsifier and intitiator on stability of emulsion polymerization was studied. It was found that with 0. 4% intitiator, of which the ratio of oxidant to redutant was 3: 2, and 3% emulsifier, the stability of emulsion was higher when ring-opening polymerization of Vi-D4 was proceeded at pH 3, and charging time of acylic monomers and siloxane intermediate was respectively 3 h and 2 h.

Key words: tetramethyl tetravinyl cyclotetrasiloxane, stability of polymerization, silicone-acrylate emulsion, high amount of siloxan

摘要： 以四甲基四乙烯基环四硅氧烷 (Vi-D4)为有机硅单体，在乳液体系中开环聚合得到有机硅中间体，采用种子乳液聚合工艺，与丙烯酸单体共聚得到高硅含量的硅丙乳液。研究了体系的 pH、加料方式、乳化剂的用量、引发剂的用量对乳液聚合稳定性的影响，发现 Vi-D4在 pH=3下开环聚合，引发剂用量为单体总量的 0.4%，且其配比为3∶2，乳化剂的用量为 3%，控制丙烯酸有机硅中间体的滴加时间分别为 2h和 3h制得的乳液稳定性高。

关键词: 四甲基四乙烯基环四硅氧烷, 聚合稳定性, 硅丙乳液, 高硅含量