高固含量丙烯酸酯的微乳液聚合  

Microemulsion Preparation of Acrylate Microlatex with High Solid Content

作　　者：吴跃焕[1] 赵建青[1] 

机构地区：[1]华南理工大学材料科学与工程学院

出　　处：《应用化学》2008年第2期218-223,共6页Chinese Journal of Applied Chemistry

基　　金：广州市科技攻关(2005Z3-D0331);山西省自然科学基金(2007011035);山西省科技攻关(051150);山西省高校科技研究开发(20041251)项目

摘　　要：采用半连续滴加预乳液的微乳液聚合法,合成出聚合物质量分数40%、乳化剂质量分数2.5%的丙烯酸酯微乳液。考察了单体滴加速度、乳化剂种类及其用量、电解质用量、温度和搅拌等因素对乳液粒径及性能的影响。研究表明,聚合在相当于Winsor-Ⅰ型的聚合体系中进行,由纯单体相(滴入的单体)和O/W微乳相构成,上层单体只起储存库的作用,它在缓慢的搅拌帮助下扩散进入微乳相中,只要微乳液液面上补加的单体不扰动微乳液的平衡,即不会产生粗粒子。单体滴加时间控制在4h,选择质量分数为2.5%的Dowfax2A1/OP-10乳化体系,NaHCO3质量分数为0.16%,反应温度控制在75～80℃,搅拌速度控制在150r/min,可使聚合反应平稳进行,得到了m(聚合物):m(乳化剂)=15:1的丙烯酸酯微乳液。The all-acrylate micro-latex with ω（polymer） =40% and to（emulsifier） = 2. 5% was synthesized by microemulsion polymerization. Influences of various factors such as monomers feeding rate, emulsifier level, amount of electrolyte, polymerization temperature and agitation speed on the properties of the latex were discussed, and a polymerization mechanism was proposed. The results suggested that the polymerization took place in the locus as in Winsor-polymerization system that included dropping monomer phase as reservoir and the O/W microemulsion phase as the polymerization locus. The dropped monomer diffused into the O/W microemulsion phase and propagated under such a slow agitation that the balance of polymerization was maintained and successive big polymer particles could not emerge, and then high solid content all-acrylate microlatex was prepared. The all-acrylate microlatex with m （monomer） ： m （emulsifer） = 15 ： 1 was prepared with 2. 5% mass content of DowFax2A-1/OP-10, 0. 16% mass content of NaHCO3 and 150 r/min of stirring rate at 75-80℃ for 4 h.

关 键 词：丙烯酸酯 微乳液聚合 高固含量 

分 类 号：O631.5[理学—高分子化学]