支化型氟素消泡剂的合成及应用研究

Synthesis and Application of Branched Fluorine Defoamer

摘要:

消泡剂被广泛应用于环保水性涂料中，起到提高涂膜的美观性、封闭性、保护性和耐久性等作用。以季戊四醇三烯丙基醚（APE）、双烯丙基封端聚醚和过量的端含氢硅油为原料，制备了分子末端含硅氢键的支化型结构前驱体。以活性烯丙醇聚醚（APEG-200）和含氟单体（全氟辛基乙烯）为封端剂，与前驱体进行硅氢加成反应，最终制备分子末端含有氟元素的新型消泡剂，将其与传统有机硅消泡剂进行应用对比测试。结果表明，将制备的支化型氟素消泡剂应用于水性木器涂料中，其较传统有机硅消泡剂具有优越的综合性能。

Abstract:

Defoamers are widely used in environmentally friendly waterborne coatings to improve the aesthetics， sealing， protection， and durability of the coating film. In this paper， a branched structure precursor containing silicon-hydrogen bonds at the molecular end was prepared using pentaerythritol triallyl ether （APE）， diallyl-terminated polyether and excess terminal hydrogen-containing silicone oil. Then， the active allyl alcohol polyether （APEG-200） and fluorine-containing monomer （perfluorooctyl ethylene） were used as end-capping agents to achieve hydrosilylation reaction with the above precursors， and finally a new type of defoaming agent containing terminal fluorine was prepared. Through the application comparison test with traditional silicone defoamer in waterborne wood coatings， it is found that the branched fluorine defoamer prepared in this paper has superior comprehensive performance.