阳离子型水性UV固化含氟聚氨酯树脂的制备及性能研究

Preparation and Performance of Cationic Waterborne UV-Curable Fluorinated Polyurethane Resin

以二乙醇胺、甲基丙烯酸十三氟辛酯为原料,通过迈克尔加成反应合成一种含氟二元醇(F-DEA),并以此为含氟单体,通过缩合共聚的方法与异佛尔酮二异氰酸酯(IPDI)、聚四亚甲基醚二醇(PTMG-1000)、N-甲基二乙醇胺(MDEA)以及季戊四醇三丙烯酸酯(PETA)反应合成一种阳离子型水性UV固化含氟聚氨酯树脂。利用FT-IR、1H-NMR等手段对产物的分子结构进行表征。采用粒径分析、接触角、X射线光电子能谱(XPS)以及各种性能测试手段,对乳液、光固化过程及涂膜性能进行分析研究。结果表明:在一定条件下,该树脂能稳定分散在水中,随着含氟量的增加,乳液粒径增大,但光固化效率有所降低,同时热处理后的氟碳链迁移至涂膜表面,所得的光固化涂膜各种性能较好,特别是耐水和耐酸碱性有明显改善。

A kind of fluorinated diol （F-DEA） was synthesized from diethanol amine and 1H, 1H, 2H, 2H - perfluorooctyl methacrylate via Michael addition, which was used as fluorinated monomer to further react with isophorone diisocyanate （1PDI） , polytetramethylene ether glycol （ PTMG - 1000 ）, N - methyldiethanolamine （ MDEA ） and pentaerythritol triacrylate （PETA） via condensation polymerization to prepare a novel waterborne UV-curable fluorinated polyurethane resin （WFPU）. The structure of which was characterized by FT-IR and 1H-NMR. Several analyzing methods including particle size analysis, contact angle meas- urement and X-ray photoelectron spectroscopy （XPS） were applied to investigate the emul- sion, UV-curing process and film properties. The result showed that the resin could be stably dispersed in water. Moreover, the increase of fluorine content in resin could result in the in- crease of emulsion particle size and the decrease of UV-curing efficiency. Fluorocarbon chains migrated to the surface of film after heat treatment and thus the said film gave good perform-ance, especially gave significantly improved resistance to water, acid and alkali.