全氟烷基侧链改性阳离子水性聚氨酯的制备与应用研究

以异佛尔酮二异氰酸酯(IPDI)、聚四氢呋喃二醇(PTMG1000)、1,4-丁二醇(BDO)、N-甲基二乙醇胺(MDEA)、三羟甲基丙烷(TMP)等为主要原料,通过全氟乙基辛醇(FEOH)封端改性,制备了含全氟烷基侧链的阳离子含氟水性聚氨酯乳液。通过红外光谱(FTIR)、热重分析(TG)对其结构与膜性能进行了表征,并且将其作为纸张防水防油剂用于表面施胶,对处理后纸张表面的水和液体石蜡接触角及纤维形态进行了研究。结果表明,聚氨酯分子链中的全氟烷基成膜时产生了较大取向作用,含氟基团向空气/聚合物界面伸展,有明显的"趋表"现象,这有利于形成低能表面,对聚合物内部分子形成了很好的保护作用,使涂膜具有较高的耐热降解性能。当表面施胶质量分数为0.3%时,纸张即可达到优异的防水防油效果,水接触角达到134.7°,液体石蜡接触角达到119.2°。

Preparation and application of cationic waterborne polyurethane modified by perfluoroalkyl side chain

Cationic fluorinated waterborne polyurethane (WCFPU) emulsion containing perfluoroalkyl side chain was prepared by the reaction of isophorone isocyanate (IPDI), polyether polyol (PTMG1000), N - methyldiethanolamine (MDEA), 1,4 - butanediol (BDO), trimethylol propane (TMP) and modified by 2-(perfluorooctyl) ethyl alcohol (FEOH). The structure of the polymer and performance of the film were characterized by fourier transform infared spectrometer (IR), thermogravimetric analysis (TGA), and the cationic fluorinated waterborne polyurethane was used as paper water and oil-resistant agent, the contact angle of water and liquid paraffin and the fiber morphology of sized paper surface were also investigated. The results showed that during the process of casting films, the fluorinated group stretched on the interface exterior of the air and the polymer, which could beneficial to form low energy surface and protect the inner molecule of the polymer effectively; and the films were provided with excellent heat resistance property. And the excellent water and oil-resistant property was reached when the concentration was 0.3 wt%, the contact angle of water was 134.7°,the contact angle of liquid paraffin was 119.2°.