高固含量乳液(St/BA/AA)的合成、乳胶粒径及其分布

采用滴加预乳化液的半连续乳液聚合方法,合成了固含量高达65%的苯乙烯/丙烯酸丁酯/丙烯酸(St/BA/AA)共聚物乳液,并系统研究了乳化剂含量、固含量、单体配比、功能单体浓度对乳胶粒大小及分布的影响,利用透射电子显微镜对乳胶粒子的微观形态进行了表征.结果表明,乳化剂及功能单体浓度增加,乳胶粒粒径减小,分布变窄;增加固含量、单体BA用量,乳胶粒径增大,分布加宽.高固含量(St/BA/AA)乳液的平均粒径在150 nm～500 nm范围内,粒径分散系数为1.06～2.5,乳胶粒子呈多分散分布.

SYNTHESIS OF HIGH SOLID CONTENT (St/BA/AA) EMULSION, PARTICLE SIZE AND ITS DISTRIBUTION

65% solid content styrene/butylacrylate/acrylic acid(St/BA/AA) emulsions were synthesized by the method of pre-emulsified semi-continuous emulsion polymerization. The effects of content of emulsifier, solid content, composition of monomers and functional monomer on the particle size, as well as particle size distribution of polymer latex were investigated, The micro-morphology of the latex particle was also characterized by TEM. The results show that an increase in the content of emulsifier, initiator and functional monomer gets latex with smaller particle and more narrow particle size distribution. The latex with bigger particle size and wider particle distribution was obtained with the increase of the content of solid and BA, as well as the increase of temperature. The average particle size is within 150 nm~500 nm, and the particle size distribution indexes within 1.06~2.5 for high solid content latex.