改性钛溶胶/羟基丙烯酸酯复合乳液的制备与表征

采用溶胶-凝胶法制备了-甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)改性的钛溶胶，通过单体预乳化方法结合半连续种子乳液聚合工艺合成了甲基丙烯酸甲酯（MMA)、丙烯酸丁酯(BA)、丙烯酸（AA)、苯乙烯（St)和甲基丙烯酸羟乙酯(HEMA)等聚合物乳液，将改性钛溶胶加入到聚合物乳液中，制得具有核壳结构的改性钛溶胶/羟基丙烯酸酯复合乳液. 考察了乳化体系、改性二氧化钛溶胶添加量、羟基单体用量对聚合反应稳定性以及乳液性能的影响，用红外光谱、DSC、GPC以及SEM对乳胶粒进行表征. 结果表明:乳胶粒具有规整的球形结构，平均粒径为200 nm左右；当选用SR-10反应性乳化剂，改性二氧化钛溶胶的添加量（质量分数）为5%，羟基单体质量分数为20%，制得的乳液具有较好的稳定性且乳胶膜的耐水性能较好.

Preparation and Characterization of the Modified Titanium Sol/Hydroxyl Acrylate Composite Emulsion

Modified titanium sol was prepared by sol-gel method, using -methacryloxypropyl trimethoxy silane (KH-570) as modifying agent, and the modified titanium sol/acrylate composite emulsion with a core-shell structure was synthesized through the addition of modified titanium sol to the polymeric latex prepared from methyl methacrylate (MMA), butyl acrylate (BA), acrylic acid (AA), styrene(St）and hydroxyethyl methacrylate (HEMA) by semicontinuous seed emulsion polymerization and pre-emulsification. The influence of the emulsifying system, the amount of hydroxyl monomer, the content of modified titanium sol on the stability of the emulsion polymerization and the properties of emulsion were investigated, and the copolymer emulsion was characterized by FTIR 、DSC、GPC and SEM. Results showed that the latex particles had the regular spherical structure, and the average diameter of the particles was about 200 nm. The prepared emulsion had optimal stability and water repellency when the reactive emulsifiers SR-10 was selected, and the mass content of modified nano-TiO2 sol and hydroxyl monomer were 5% and 20%, respectively.