反应性聚硅氧烷微乳液的合成研究

采用微乳液聚合法,以八甲基环四硅氧烷(D4)、γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)为原料,合成半透明的反应性聚硅氧烷微乳液,研究了聚合工艺因素对单体转化率、乳液透射率、粒径及乳液稳定性的影响。结果表明,当D4用量为10%,DBSA用量为12%(占D4),KH-570用量为6%(占D4),乳化剂SDS、AEO-7、AEO-9按质量比4∶2∶1复合,用量为6%,助乳化剂正丁醇用量为0.5%,温度为80~85℃,反应时间为5 h时,所制备的反应性聚硅氧烷微乳液单体转化率可达85.63%,外观半透明,无漂油,粒径在40~50 nm。

Study on synthesis of reactive polysiloxane microemulsion

The semi-transparent reactive polysiloxane microemulsion was synthesized by microemulsion polymerization with octamethycyclotetrasiloxane (D_4) and 3-(trimethoxysily1)propyl methacrylate(KH-570) as raw materials.Effects of polymerization technological factors on the conversion of monomer,transmission rate,particle size and stability of microemulsion were studied.The results indicated that when the dosage of D_4 was 10%,the dosage of DBSA was 12% according to D_4,the dosage of KH-570 was 6% according to D_4,the emulsifier was compounded by mass ratio of 4∶2∶1 with SDS,AEO-7,AEO-9, the dosage of emulsifier was 6%,the dosage of co-emulsifier n-butyl alcohol was 0.5%,the reaction temperature was 80～85 ℃,the reaction time was 5 h,reactive polysiloxane microemulsion obtained under the above conditions was semi-transparent and non-bleaching oil.The monomer conversion rate was 85.63% and the particle size was 40～50 nm.