紫外光固化碳纳米管改性水性聚氨酯涂膜

Ultraviolet-curable coating of water-based polyurethane modified by carbon nanotubes

以异佛尔酮二异氰酸酯(IPDI)、聚乙二醇(PEG400)、2,2-双羟甲基丙酸(DMPA)和甲基丙烯酸-2-羟乙酯(HEMA)为主要原料,合成光固化水性聚氨酯丙烯酸酯预聚体,以三乙醇胺中和后,原位引入经浓硝酸处理过的碳纳米管(CNTs),制备了光固化水性聚氨酯碳纳米管复合乳液(WPU/CNTs),加入光引发剂后交联固化得到聚氨酯复合膜。研究了复合涂膜的电学和力学性能,通过扫描电镜(SEM)对复合膜微观结构进行了分析。结果表明,碳纳米管均匀分散在聚氨酯膜中,当CNTs质量分数为0.6%时,复合涂膜的拉伸强度为15.54MPa,断裂伸长率为31.27%,附着力0～1级,悬臂梁冲击强度10.37kJ/m2。涂膜具有半导体性质,可用作抗静电材料。

A UV-curable water-based polyurethane acrylate prepolymer was synthesized with isophorone diisocyanate （IPDI）, polyethylene glycol （PEG400）, 2,2-bis（hydroxy- methyl）propionic acid （DMPA） and 2-hydroxyethyl methacrylate （HEMA） as main materials, and then neutralized with triethanolamine and in-situ introduced with carbon nanotubes （CNTs） treated by concentrated nitric acid to form a UV-curable waterborne polyurethane/carbon nanotubes （WPU/CNTs） composite emulsion. A polyurethane composite coating was obtained from the WPU/CNTs composite emulsion by curing and crosslinking after the addition of photoinitiator. The electrical and mechanical properties of the composite coating was studied, and the microstructure was analyzed by scanning electronic microscopy （SEM）. The results showed that the CNTs were well dispersed in the polyurethane film. When the mass fraction of CNTs is 0.6%, The composite coating features a tensile strength of 15.54 MPa, breaking elongation of 31.27%, adhesion of 0-1 grade, and cantilever beam impact strength of 10.37 kJ/m^2. The coating has semiconductive properties and can be used as an antistatic material.