聚醚改性三硅氧烷表面活性剂的合成与表征

选用聚合度为7的甲氧基封端的烯丙基聚醚来改性七甲基三硅氧烷,采用高效铂络合物催化剂,通过无溶剂界面聚合,在氮气保护下进行硅氢加成反应制备三硅氧烷类有机硅表面活性剂,用IR对其结构进行表征,并将其与同类有机硅产品进行水解稳定性对比。优化工艺条件为:nAEM:nMDHM=0.9:1,反应温度100℃,反应9h,催化剂用量为12×10-4%(以铂原子计),在该条件下七甲基三硅氧烷的转化率为86.7%。结果表明,产物CMC为0.021g.L-1,γCMC为17.61mN.m-1,其表面张力在强碱和酸性条件下随时间变化最小,产品水解稳定性优于一般同类有机硅产品,适用于更宽的pH范围。

Synthesis and characterization of polyether modified trisiloxanes

Methoxy-terminated polyether polyols were used to modify 1,1,1,3,5,5,5-heptamethyltrisiloxane[BFQ] (MDHM) to prepare trisiloxane surfactant by using Pt complex catalyst under no solvent condition and the protection of nitrogen.The products were characterized with IR, and their hydrolytic stability properties were compared with similar siloxanes.The reaction conditions were investigated, and the optimized conditions were as follows: n_AEM∶n_MDHM=0.9∶1,temperature and time 100℃ and 9 h respectively, catalyst dosage (in terms of Pt) 12×10-4% of the total mass of the reactants.The result showed that CMC was 0.021 g·L^-1, and ^γ_CMC was 17.61 mN·m^-1.The change in surface tension of the products with time under alkaline and acidic condition was the lowest, and the hydrolytic stability was better than similar siloxanes.