摘要： 以异丙醇为介质，用钛酸酯偶联剂对纳米ZnO进行表面改性，制备改性纳米 ZnO/WPU(水性聚氨酯)复合涂膜。通过涂膜的力学性能来评价纳米 ZnO的改性效果，讨论了改性纳米 ZnO添加量对涂膜的力学性能、耐摩擦性能及耐水性能的影响。结果表明:当偶联剂用量为 2%(质量分数)，搅拌时间为 70min，反应温度为 50°C时，纳米 ZnO 改性效果最好，当改性纳米 ZnO添加量为 0.3%(质量分数)时涂膜的综合性能最佳。

关键词: 水性聚氨酯, 纳米 ZnO, 表面改性

Abstract: Titanate coupling agents were used for surface modification of nano-Zno, with isopropyl alcohol as medium, Modified nano-ZnOWPU composite coating film was prepared by dispersing the modified nano-Zno power into WPU. Modification effect of nano-Zno was evaluated by the mechanical properties of coating films, and the effects of modified nano-ZnO content on mechanical properties, abrasion resistance and water resistance of the coating films was discussed. The results indicated that when the amount of the titanate coupling agent was 2%, the reaction time 70 min, reaction temperature 50℃, the modification effect of nano-ZnO was the best. And the coating films exhibited favorable comprehensive properties with the addition of 0. 3% modified nano-ZnO.

Key words: WPU, nano-ZnO, surface modification