Preparation method of organic fluorosiloxane modified polyurethane emulsion containing short fluoroalkyl chain

一种含短氟碳链的有机氟硅改性聚氨酯乳液的制备方法

Abstract

本发明涉及一种含短氟碳链的有机氟硅改性聚氨酯乳液的制备方法。该方法以异佛尔酮二异氰酸酯作为硬段,聚四氢呋喃醚二元醇、羟基硅油混合物作为软段,加热到70-110℃反应1-8h。然后加入二羟甲基丙酸和含氟二元醇作为扩链剂,进行一次扩链反应1-6h。降温至25-60℃,加入中和剂,搅拌0.5-1.5h,转移到高速分散仪中,加入去离子水和二次扩链剂,高速分散0.5-3h,所得乳液粒径均匀稳定。制得的改性聚氨酯乳液涂膜既具有更好的耐温、耐水、耐溶剂及耐腐蚀性,又具有良好的拒水、拒油性能。
The invention relates to a preparation method of an organic fluorosiloxane modified polyurethane emulsion containing a short fluoroalkyl chain. The method comprises the following steps: by taking isophorone diisocyanate as a hard segment and a mixture of polytetrahydrofuran ether diol and hydroxyl silicone oil as a soft segment, heating to 70-110 DEG C to react for 1-8 hours; then, adding dimethylolpropionic acid and fluorine-containing diol as a chain extender for primary chain extension for 1-6 hours; cooling to 25-60 DEG C, adding a neutralizer, stirring for 0.5-1.5 hours, and transferring to a high speed disperser; adding neutralizer and a secondary chain extender, and dispersing for 0.5-3 hours at a high speed to obtain the emulsion which is uniform and stable in grain size. The prepared modified polyurethane emulsion coating not only has better temperature resistance, water resistance, solvent resistance and corrosion resistance, but also has good water repellency and oil repellency.

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