中文摘要：

采用甲基丙烯酸甲酯（MMA）和丙烯酸丁酯（BA）为主要原料，以阴离子型乳化剂乙氧基化烷基醚硫酸铵（CO-436）和非离子型乳化剂壬基酚乙氧基化合物（CO-897）为混合乳化剂，通过原位乳液聚合的方法合成了硅溶胶-聚丙烯酸酯复合乳液。用γ-缩水甘油醚氧丙基三甲氧基硅烷（KH-560）对纳米SiO2溶胶进行表面改性，以过硫酸铵（APS）为引发剂，引入丙烯酸（AA）和丙烯酸羟乙酯（HEA）等功能性单体，采用半连续加料法，通过原位乳液聚合的方法，合成硅溶胶-聚丙烯酸酯核-壳乳液。研究了聚合反应温度、引发剂、复合乳化剂用量及配比，单体与SiO2的质量比等因素对乳液聚合反应过程的影响。结果表明，第1阶段的种子乳液合成温度控制在75℃左右，第2阶段的核-壳乳液合成反应温度控制在85℃时较佳；乳化剂用量占单体质量的4．0％，m（阴离子乳化剂）：m（非离子乳化剂）=1：3时，体系乳化充分，单体转化率较高，凝胶较少；以纳米SiO2溶胶中的SiO2用量占单体质量的8％较好，制得硅溶胶-聚丙烯酸酯复合乳液固含量为40％，乳液的稳定性达到使用要求；引发剂的用量以占单体质量的0．4％～0．6％为宜，此时聚合反应较完全，单体转化率较高，聚合过程稳定。

英文摘要：

The silica sol-polyacrylate composite emulsion was synthesized via in-situ polymerization using MMA and BA as main monomers and a mixed emulsifier consisting of CO-436 and CO-897.The nano-siliea sol surface was modified by silicon coupling agent （KH-560） ;and then the silica sol-polyaerylate emulsion with core-shell structure was synthesized via in-situ polymerization using APS as an initiator, AA and HEA as functional monomer by a semi-continuous polymerization technology. Based on this,the influencing factors such as polymerization temperature, amount of the initiator （APS）,and mixed emulsifier as well as the ratio of CO-436 to CO-897,and the amount of SiO2 sol on the polymerization process were investigated. The results showed that the optimal emulsion polymerization temperature was about 75 ℃ for the seed emulsion polymerization of the first stage, and 85 ℃ for the core-shell emulsion polymerization of the second stage. When the amount of mixed emulsifier was 4.0% of the monomer, and the mass ratio of anion emulsifier to non-ionic emulsifier was 1 ：3, sufficient emulsification, high monomer conversion and low gel rate for the polymerization system could be obtained. When the amount of nano-SiO2 silica sol was 8.0% of the monomer, solid content of obtained silica sol-polyacrylate composite emulsion was 40%,the stability of emulsion conld meet the usage demands. The optimal amount of initiator（APS） was 0.4%-0.6% of the monomer for complete polyreaction,high monomer conversion and stable polymerization process.