采用自制４－丁氧甲酰氨基甲苯２－异氰酸酯（ＢＣＡＴＩ）改性Ｅ－５１环氧树脂和４－丙烯酰氧乙氧甲酸氨基甲苯２－异氰酸酯（ＡＥＣＡＴＩ）改性丙烯酸碱部分丙烯酸）Ｅ－５１环氧酯树脂为基础材料，经优选试验制成的清漆膜按国标测试和恒电量法测定，其耐蚀性能良好；依据以透射电子显微镜所摄制的漆膜孔洞照片与按合成万法推理（经化学方法测定，有关合成反应已定量或接近定量完成）算得的漆膜树脂相关的结构参数，讨论了本类漆膜结构与耐介质腐蚀性能的关系．
Epoxy E-51 was improved with 4-Butoxy Carbonyl Amino Tolueme 2-Isocyanate(BCATI, homemade)and Epoxy acrylate or partial epoxy acrylate was improved with 4-Acryloxy Ethoxy Carbonyl Amino Toluene 2-Isocyanate(AECATI, also home-made). These improved epoxy resins were designated by improved resinⅠ, Ⅱ and Ⅲ respectively. They were used as basic materials to prepare the varnish Ⅰ,Ⅱ and Ⅲ. The present study focuses on the dependence of the resistance to aqueous medium (3%NaCI solution, 10%NaOH solution, distilled water) on the structure of the varnish films. The main results are as follows.(1) In accordance with the PRC national standards for paints, corrosion resistance of the varnish I is only fair while that of the varnish 11 and ill are excellent. (2) The polarization resistance RP measured in 2%NaCI by coulostatic perturbation method are 105Ω-cm2 for varnish Ⅰ and 107Ω-cm2 for varnish Ⅱand Ⅲ. (3) The normalized hole densities of the varnish films as, evaluated by TEM are 8-60 for Ⅰ, 1 for Ⅱ and 1.2-2.1 for Ⅲ. (4) The contents of -OH wt% in the varnish films are 8.97, 4.02 and 3.o6 for Ⅰ, Ⅱ and Ⅲ respectively. (5) In general, the higher the normalized hole density and -oH wt% of the varnish films, the poorer their corrosion resistance.
参考文献
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