有机硅/丙烯酸酯乳液的粒径与分散行为研究

采用半连续乳液聚合法合成了以丙烯酸丁酯和甲基丙烯酸甲酯为成核单体,丙烯酸丁酯(MAA)、甲基丙烯酸甲酯(BA)、丙烯酸(AA)和γ―甲基丙烯酰氧基丙基三甲氧基硅烷为成壳单体的核壳结构乳液。采用马尔文纳米粒度仪等研究了乳液的粒径及其分布与引发剂和乳化剂用量之间的关系,粒径对乳液稳定性的影响以及乳液粒径与温度的关系,通过透射电镜对乳液微粒形态进行了分析。结果表明,乳液的粒径随着引发剂和乳化剂用量的增加而减小,乳液粒径在30～60℃时较为稳定,当引发剂过硫酸铵质量分数为0.55%,乳化剂十二烷基苯磺酸钠质量分数为2%时,制得的乳液粒径在120 nm左右,具有明显的核壳结构和较好的稳定性。

Particle size and dispersion behaviors of oganosilicone modified acrylate latex emulsion

A core-shell emulsion was prepared by semi-continuous emulsion polymerization,in which MMA and BA as core monomers,MMA,BA,AA and KH-570 as shell monomers.The relationshiop between particle size and distribution of emulsion and amount of initiator and emulsifier,effect of particle size on emulsion stability and relationship between particle size and temperature were investigated by Malvern laser nano particle size distribution analyzer.The latex particles morphology was analyzed by TEM.The results showed that the latex particle size was decreased with the amount increasing of emulsifier and initiator.The particles size was more stable at 30~60 ℃.The particle size was about 120 nm when the emulsion with APS and SDBS mass fraction of 0.55% and 2%,repectively and had distinct core-shell structure and good stability.