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| CORROSION RESISTANCE AND STRUCTURE OF THE VARNISH FILMS PREPARED BY ISOCYANATE-IMPROVED EPOXY RESINS |
| Chen Xingqi; Liu Shuguang; Zhao Chansjiu and Zhang Shuling(Hunan University) |
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Abstract 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.
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Received: 25 April 1994
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| 1(1)USP4098841(2)EP01723302EP02597273吴德昌．化工技术,1985,9(1):41-444陈行琦,剂曙光,张淑玲,李响军．材料保护,1993,26(2):10-145刘曙光,陈行琦,张淑玲,汪东．高分子材料科学与工程,1993,9(2):44-506陈行琦．湖南大学学报,1991,18(3):64-707赵常就,陈范才,陈训娥．中国腐蚀与防护学报,1990,10(4):317-3388[英]J．D．Lee著,张靓华等译,申件文校．新编简明无机化学;第三版．北京:人民教育出版社,1983,p162 |
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