Abstract:

A prepolymer of Uv-curable waterborne polyurethane( WPU) were prepared from isophorone disocyanate(IPDI),polyethyene glycol (PEG400), dimethylol propionic acid(DMPA) and hydroxyethyl methacrylate(HEMA), which was then reacted with silane coupling agent KH-570 grafted CNTs via insitu polymerization to prepare the WPU/CNTs emulsion. A polyurethane composite coating film was obtained from the WPU/CNTs composite emulsion by crosslinking after the addition of photoinitiator. The electrical and mechanical properties of the coating were studied, and the microstructure was analyzed by transmission electronic microscopy (TEM). The results showed that the silane coupling agent treated CNTs were well dispersed in the polyurethane film. When the mass fraction of CNTs was 0. 6%, the tensile strength was 15.34 MPa, elongation at break was 30. 62% tensile modulus 176. 84 MPa, and impact strength 10. 14 kJ/m².The coating has semiconductive properties and can be used as an antistatic material.

Key words: waterborne polyurethane, carbon nanotubes, UV-curable, silane coupling agent

摘要： 以异佛尔酮二异氰酸酯(IPDI)、聚乙二醇(PEG40)、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(WPU)，再让接枝了硅烷偶联剂 KH-570的碳纳米 管(CNTs)与该预聚体原位聚合制备 WPU/CNTs乳液，加入光引发剂后交联固化得到聚氨酯复合膜。研究了其电学性 能和力学性能，通过透射电镜(TEM)对其微观结构进行了分析。结果表明:经过硅烷偶联处理的碳纳米管更均匀地分 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15.34MPa，断裂伸长率为30.62%，拉伸模量176 .84MPa，耐冲击强度为10.14kJ·m^-2 ，涂膜具有半导体性质，可用作抗静电材料。

关键词: 水性聚氨酯, 碳纳米管, 光固化, 硅烷偶联