Abstract: In the present study, SiO₂/polyacrylate composite emulsion (SiO₂/ PA)were prepared by directly mixing polyacrylate emulsion(PA)with modified silica sol. The influence of colloidal silica content on the properties of SiO₂/PA composite emulsion(SiO₂/ PA) were studied. The results showed that SiO₂/ PA composite emulsionwith SiO₂-content up to had a good storage stability and an average particle diameter of 170~180 nm. The water and alcohol resistance, pendulum hardness tensile strength of cured film were improved with the increasing amount of colloidal silica. SEM test indicated that SiO₂/ PA films displayed a emooth and densed surface. TGA analysis showed that coating films possessed good thermal stability.

Key words: silica sol, silane coupling agent, SiO₂/ PA composite emulsion

摘要： 将改性硅溶胶添加到聚丙烯酸酯乳液中制备高硅含量 SiO₂/聚丙烯酸酯复合乳液(SiO₂/ PA)。研究了硅溶胶用量对 SiO₂/PA乳液及涂膜性能的影响，结果发现 SiO₂/PA复合乳液的 SiO₂ 含量高达 48%，贮存稳定性好，平均粒径为 170~180nm。随着硅溶胶与聚丙烯酸酯乳液配比的增大，涂膜的耐水性、耐醇性、摆杆硬度和拉伸强度都有所提高。扫描电子显微镜(SEM)测试发现高硅含量涂膜表面平整致密，TGA分析表明 SiO₂/PA杂合涂膜热稳定性良好。

关键词: 硅溶胶, 硅烷偶联剂, SiO₂/PA复合乳液