丙烯酸酯乳液的合成及改性研究

以丙烯酸丁酯(BA)和丙烯酸-2-乙基己酯(2-EHA)为软单体、甲基丙烯酸甲酯(MMA)为硬单体、丙烯酸(AA)为功能单体、甲基丙烯酸羟乙酯(HEMA)为交联单体和十二烷基硫酸钠(SDS)/乳化剂(OP-10)为阴/非离子型复合乳化剂,采用核/壳种子乳液聚合法制备了丙烯酸酯共聚乳液;然后在壳层聚合时寸加入HEMA,并用乙烯基有机硅进行改性,制得硅丙乳液。结果表明:当m(SDS):m(OP-10)=3:2、w(复合乳化剂)=3.4%、w(引发剂)=0.82%、w(HEMA)=3.5%、聚合温度为80℃以及聚合中期加入6.8%乙烯基硅油至壳单体中时,硅丙乳液及其胶膜的稳定性、耐水性和力学性能俱佳。

Study on synthesis and modification of acrylate emulsion

With butyl acrylate(BA) and 2-ethylhexyl acrylate(2-EHA ) as soft monomers,MMA(methyl methacrylate) as hard monomer,acrylic acid(AA) as functional monomer,hydroxyethyl methacrylate(HEMA) as crosslinker monomer,and sodium dodecyl sulfate(SDS )/emulsifier(OP-10 ) as anionic/non-ionic composite emulsifier,an acrylate copolymer emulsion was prepared bv core/shell seed -emulsion polymerization.Then a silicone-acrylate emulsion was prepared by adding HEMA into shell polymerization and vinyl silicone as modifier. The results showed that the silicone -acrylate emulsion and its film had better stability,water-resistance and mechanical properties when mass ratio of m(SDS):m(OP-10) was 32,mass fractions of composite emulsifier,initiator and HEMA were 3.4%,0.82%and 3.5%respectively,polymerization temperature was 80℃,and 6.8%vinyl silicone was introduced into shell monomers in polymerization medium-term.