摘要： 合成了新型乳液型聚醚改性有机硅消泡剂，通过分子设计合成了消泡剂所用含氢硅油及烯丙基聚醚，含氢硅油合成的最佳条件为：催化剂占总量的 ２％，反应温度 ６０ ℃ ，反应时间为 ６ ｈ。 通过正交试验确定了聚醚改性有机硅合成的最佳条件是：反应温度为 １２０ ℃ ，反应时间为 ８ ｈ，催化剂用量为 １５×１０^－６，转化率可达 ９８％。 其中烯丙基聚醚由亲水性聚醚 Ａ１ 与疏水性聚醚 Ｐ１ 按一定比例加成，Ａ１ 与 Ｐ１ 的最佳比例为 １ ∶ ２.５。 最后采用复合乳化剂乳化上述聚醚改性有机硅，乳化剂用量为１５％，ＨＬＢ 值为 １１.５，得到稳定的乳液型消泡剂，并对产品进行了表面性能测试。

关键词: 硅氢加成, 聚醚改性有机硅, 乳化剂, 表面性能, 消泡剂

Abstract: In this paper, a novel emulsion-type polyether modified silicone defoamer was synthesized. The hydrogen-containing silicone oil and allyl polyether are synthesized via mo-lecular design and the optimum conditions for the synthesis of hydrogen-containing silicone oil were as follows: the content of catalyst is 2% based on total weight of reaction system, the re-action temperature is 60C, and the reaction time is 6 h. The optimum conditions for the prep-aration of polyether modified silicone were determined by orthogonal test as follows: the reac-tion temperature is 120 ℃(T), the reaction time is 8 h(t), and the content of catalyst is 15ppm, by which the conversion rate is 98%, wherein the allyl polyether is the addition product of hydrophilic polyether A, and the hydrophobic polyether P, at a certain mol ratio, preferably at 1: 2. 5. Finally, the composite emulsifier is used to emulsify the polyether modified silicone to prepare a stable emulsion-type defoamer, wherein the emulsifier is 15% and the HLB value is 11. 5. The surface performance of the product is tested.

Key words: hydrosilylation, polyether modified silicone, emulsifier, surface perfomance;defoamer