摘要
用硅溶胶、丙烯酸酯类单体,以过硫酸钾为引发剂,配以适当的乳化剂,采用乳液聚合法制成了高SiO2含量硅溶胶聚丙烯酸酯复合乳液。系统的研究了温度、乳化剂种类及用量、单体SiO2质量比等因素对乳液稳定性的影响。结果表明75℃为最佳反应温度;十二烷基硫酸钠(SDS)为最佳乳化剂;当SDS质量分数为0.45%～0.7%、单体SiO2质量比为3时,可制得SiO2质量分数为10%的复合乳液,且乳液的稳定性达到使用要求,此法制得的复合乳液的涂膜水白性较共混改性乳液(硅溶胶和纯丙乳液)和纯丙乳液的涂膜有显著的提高;TEM图片显示,复合乳液中,硅溶胶粒子是以纳米SiO2粒子存在的,且在复合乳液中比在共混改性乳液(硅溶胶和纯丙乳液)中分散的更均匀。
The compound emulsion of SiO2 sol/polyacrylate was synthesized by in-site emulsion polymerization using SiO2 sol and acrylate monomer. Some factors affecting the stability of the compound emulsion were discussed. It shows that the better reaction temperature is 75℃ and the anionic sodium dodecyl sulfate（SDS） was the more effective emulsifier. When ωSDS was between 0.45 % -0.7% and the weight ratio of the monomer to SiO2 is 3, the compound emulsion of high SiO2 sol/acrylic resin with 10 % of SiO2 was synthesized and its stability is good for use. The transmission electron micrographs （TEM） of the compound emulsion shows that the silica particles in the compound emulsion are dispersed more homogeneously than that in the blend emulsion of polyacrylate emulsion and silica-sol. The films of the compound emulsion show an excellent waterproof compared with those of the pure polyacrylate emulsion and the blend of polyacrylate emulsion and silica-sol.
出处
《北京化工大学学报（自然科学版）》
CAS
CSCD
北大核心
2005年第3期57-60,65,共5页
Journal of Beijing University of Chemical Technology(Natural Science Edition)
关键词
硅溶胶
聚丙烯酸酯
乳液聚合
复合乳液
SiO2 sol
polyacrylate
emulsion polymerization
compound emulsion
