摘要： 采用端羟基阳离子聚氨酯低聚物作为插层剂对钠基蒙脱土( MMT) 进行有机改性，制备出羟基修饰的聚合物蒙脱土。 将该改性活性有机蒙脱土(OMMT)作为增强体，制备出聚氨酯纳米片层粒子复合的杂化树脂。 以封端型六亚甲基二异氰酸酯(HDI)三聚体为交联剂与上述复合树脂混合，经机械剪切、水乳化得到纳米杂化电泳树脂，经电泳工艺制备出聚氨酯漆膜，漆膜的耐化学腐蚀性得到改善。 采用广角 X 射线衍射(WXRD)、傅里叶变换红外(FT-IR)、热重(TG)分析研究了新型有机蒙脱土的结构与性能。 用透射电子显微镜( TEM) 表征了杂化聚合物及有机蒙脱土的形态。 同时研究了有机蒙脱土添加量对漆膜性能的影响。 结果表明:钠基蒙脱土经端羟基阳离子聚氨酯改性后，其层间距由原来的 1.309 nm  扩大到 2.154 nm，当其质量分数为 0.3%时，电泳漆膜的耐酸性和耐水性得到较大的改善。

关键词: 有机蒙脱土, 端羟基阳离子聚氨酯, 漆膜, 性能

Abstract:

Hydroxyl terminated cationic polyurethane oligomers were used as intercalating agent to modify the Na-montmorillonite (Na-MMT) to form the hydroxyl-modified montmorillonite. The novel active organic montmorillonite(OMMT) was used as the reinforcing body of polyurethane matrix to prepare the cationic polyurethane hybrid resins. The hexamethylene diisocyanate (HDI)trimer as the cross-linking agent was combined with the hybrid resin and then emulsified in water to give the nano-hybr electrophoresis resin. A series of polyurethane films were prepared by the electrophoresis process, showing an improved chemical corrosion resistance. Wide-angle X-ray diffraction(WXRD), Fourier transform infrared(FT-IR)and thermo-gravimetry(TG) were used to study the structure and properties of the novel organic montmorillonite. The morphology of the polyurethane composites was characterized via transmission electron microscope(TEM). The effects of the organic montmorillonite content on the
morphology and the property of film were studied. The results showed that the inter lamellar space of the novel OMMT was enlarged from 1.309 nm to 2. 154 nm when the NA-MMT was modified by hydroxyl-terminated cationic polyurethane, furthermore, the properties such as acid resistance and water resistance of the electrophoresis film were improved significantly when the mass fraction of OMMT was 0.3%.

Key words: OMMT, cationic polyurethane, electrophoresis film, properties