一种聚硅氧烷消泡剂的合成与表征

Synthesis and Characterization of a Type of Polysiloxane Defoaming Agent

摘要:

以Karstedt为催化剂，烯丙醇聚氧乙烯聚氧丙烯醚(F-6)、甲基丙烯酸十二烷基酯（LMA）和含氢硅油(PHMS)为原料，通过硅氢加成合成了一种聚硅氧烷消泡剂，产物结构通过红外及核磁共振氢谱表征。作者考察了硅氢键与碳碳双键摩尔比、反应温度、反应时间、催化剂用量对反应转化率的影响，确定了最佳工艺为：n（Si-H）:n（C=C）=1:1.20,催化剂用量为50μg/g,反应温度为90 ℃，反应时间为8 h,产物转化率达到94.78 %, 应用测试表明其消抑泡性能优于市售同类产品。

Abstract:

A kind of polysiloxane defoamer polysiloxane were synthesiszed by the hydrosilylation reaction with polyethylene oxide ethyl polyethylene oxide propyl ether (F - 6) and lauryl methacrylate(LMA) containing hydrogensilicone oil as material, using Karstedt the catalyst. The structure of the molecular of the synthesized defoamer were characterized by infrared (IR) spectrum and nuclear magnetic resonance (1HNMR) spectrum. The author determined the optimum reaction conditions through by investigating the effects on the reaction conversion of the molar ratio of silicon-hydrogen bonds with the carbon-carbon double bond，reaction temperature，reaction time，amount of catalyst. The best technology of the product achieved 94.78 % with the optimum reaction conditions that the molar ratio of silicon-hydrogen bonds was 1:1.20, the amount of catalyst was 50 μg/g, the reaction temperature was 90 ℃,and the reaction time was 8 h. Application test show that the defoamer defoaming and inhibiting performance superior to market similar products.