聚醚有机硅的合成及其在消泡剂中的应用

Synthesis of polyether silicone and its application in defoamer

为减少工艺流程中的有害泡沫,研制了一种聚醚有机硅消泡剂。在Pt催化剂的作用下,利用端基含氢硅油与烯丙基聚醚发生硅氢加成反应制备聚醚有机硅(PESO),并对其进行结构表征和应用。探讨不同结构的PESO对消泡剂性能的影响,结果表明:端基型烯丙基聚氧乙烯醚有机硅复配的消泡剂具有水分散性好,消泡迅速,抑泡时间长等特点,尽管消泡剂的抑泡性能随PESO数均分子质量的增大可得到明显改善,但同时消泡剂的外观效果及贮存稳定性受到了很大的限制。

A defoamer of polyether silicone was prepared for reducing the bad foam in technological process. In the presence of Pt catalyst, methyl end-group hydrogen silicone （PHMS） reacted with propylene-polyether ether to form a polyether silicone （PESO）. Chemical structures of PESO and their performance were characterized. The effects of PESO with different structures on the defoaming ability were investigated. Experiment results showed that end-group polyethylene siloxane is characterized by better water-solubility, speedy defoaming, and long-term inhibitation of foam. Though the foam inhibiting ability improves obviously with increasing the molecular weight of PESO, its appearance and storage stability are influenced.