有机硅改性丙烯酸酯乳液聚合的乳化体系研究

研究了三种单体投入方式对有机硅改性丙烯酸酯乳液聚合稳定性及性能的影响.单体转化率、凝胶率及粒径分析结果表明，采取半连续种子乳液聚合方法最有利于硅丙乳液聚合，单体转化率达97％，凝胶率小于0.6％，平均粒径为100nm，且分布较窄．在此基础上进一步研究了复合乳化剂的配比及用量对乳液性能的影响，实验结果表明m(阴离子)/m(非离子)/m(两性)复合乳化剂体系配比为2：1：1且用量为4％时能够获得综合性能较好的乳液，且反应性乳化剂DNS-86可以随其他种类乳化剂一起全部加入反应体系．红外分析及透射电镜观察进一步表明在该最佳乳化剂体系条件下通过单体滴加方式能够获得形态规整、大小基本一致的硅丙乳液．

STUDY ON COMPOUNDED EMULSIFIER SYSTEM OF SILOXANE MODIFIED ACRYLATE EMULSION POLYMERIZATION

Effects of three feeding methods on siloxane modified acrylate emulsion polymerization stability and properties of emulsion were studied． The results of monomer conversion rate, gel content and latex particles size analyses showed that properties of emulsion using semi-continuance seed emulsion method were better than that using batch and pre-emulsification method, the conversion rate of monomer was 97%, gel content less then 0.6%, average particle size was 100nm and with a narrow distribution． Effects of compounded emulsifier ratio and amount on properties of emulsion were studied． Test results showed that when ratio of m(anion emulsifier)/m(nonionic emulsifier) /m(amphoteric emulsifier) was equal to 2:1:1, amount of compounded emulsifier was 4%, good performance of emulsion can be obtained, and total reactive emulsifier DNS-86 can be feed with other kinds emulsifier synchronously． FTIR and TEM analyses farther showed that silicone-acrylate emulsion with good morphology and narrow particles size distribution can be obtained by semi-continuance seed emulsion method under optimized emulsifier system condition．