以聚四亚甲基醚二醇（PTMEG-2000）、异佛尔酮二异氰酸酯（IPDI）、甲基丙烯酸羟乙酯（HEMA）、2，2-二羟甲基丙酸（DMPA）、1，4-丁二醇（BDO）为主料，合成了HEMA封端的水性聚氨酯（WPU）。引入甲基丙烯酸甲酯（MMA）、甲基丙烯酸羟丙酯（HPMA）、乙烯基三异丙氧基硅烷（AC-76）对WPU进行共聚改性。制备了系列丙烯酸类聚合物（PA）、PA／AC-76改性的PU漆膜。采用傅里叶变换红外光谱表征了漆膜的结构；利用铅笔划痕硬度仪、附着力试验仪、接触角测量仪等考察了PA用量、MMA与HPMA质量比、AC-76用量对漆膜力学性能、疏水性能的影响。结果表明：PA、AC-76与聚氨酯（PU）链段已发生了交联；改性后漆膜的力学性能、疏水性能都得到有效改善。当PA添加量为40％、硬软单体质量比m（MMA）∶m（HPMA）=5∶4、AC-76添加量为5.41％时，漆膜综合性能最佳。
A waterborne polyurethane （WPU） was synthesized with polytetramethylene ether glycol （PTMEG-2000）， isophorone diisocyanate （IPDI）， hydroxyethyl methacrylate （HEMA）， 2，2-dimethylolpropionic acid （DMPA） and 1，4-butanediol （BDO），wherein hydroxyethyl methacrylate （HEMA） was used to block the-NCO terminal groups. Then， the WPU was modified by hydroxypropyl methacrylate （HPMA）， methyl methacrylate （MMA）， vinyl triisopropoxysilane（AC-76）. A series of acrylic polymer （PA）， PA／AC-76 modified PU films were prepared. The structure of the modified film was characterized by FT-IR. The effects of PA dosage， mass ratio of MMA and HPMA， addition of AC-76 on the mechanical properties， hydrophobic property of the film were investigated via pencil scratch hardness tester， adhesion tester and contact angle meter. The results showed that the PA， AC-76 and PU were cross-linked successfully. The mechanical properties and hydrophobic properties of the modified film were improved significantly. The optimal performance of the film was obtained under the following conditions：PA 40wt％，ratio of MMA／HPMA 5∶4，AC-76 5.41％.
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