聚醚酯改性有机硅消泡剂的制备

Preparation of poly (ether-ester) modified silicone

摘要:

以含氢硅油、十四酸烯丙基聚醚酯为原料，氯铂酸为催化剂，合成了聚醚酯改性硅油，对其结构进行了红外表征。探讨了温度、时间和原料比对Si-H转化率的影响，测定了其水溶液在不同质量体积浓度下的表面张力，并将其制成消泡剂乳液研究了消泡性能。结果表明：在85℃、6h、n(C=C)∶n(Si-H)=1.3:1时，Si-H转化率为87.6%；聚醚酯改性硅油水溶液在浓度0.3g?L-1时表面张力为28.6mN?m-1；配制的消泡剂乳液消泡时间5s，抑泡高度300mL。

Abstract:

Poly (ether-ester) modified silicone oil was synthesized by fourteen acid allyl polyether ester and low hydrogen silicone,using H2PtCl6 as catalyst.The chemical structure was characterized by IR.The effects of reaction temperature,time and the molar ratio of reactants on the hydrosilation reaction were investigated. Surface tension of poly (ether-ester)modified silicone solution at different mass concentration was determined. The defoaming performance of the defoamer emulsion was studied.The results showed that:reaction temperature was 85℃,reaction time was 6h,molar ration of n(C=C):n(Si-H) was 1.30:1, the conversion rate of Si-H could reach 87.6%.The defoaming time of the emulsion was 5s,bubble restrain height was 300mL.