苯胺三聚体改性磺酸盐型水性环氧固化剂的制备及涂膜防腐性能

Preparation and Anticorrosion Properties of Aniline Trimer Modified Sulfonate Waterborne Epoxy Curing Agent

采用化学氧化法制备了可溶性的苯胺三聚体(AT),再以AT、丁基缩水甘油醚(660a)、四乙烯五胺(TEPA)为原料反应得到AT和TEPA的单封端混合产物,将产物与氨基磺酸盐(PPS)混合后再与环氧树脂(E-51)反应合成苯胺三聚体改性磺酸盐型水性环氧固化剂,将合成的水性环氧固化剂与环氧树脂E-51混合制得水性环氧乳液。通过红外光谱、透射电镜和热失重等方法对材料进行测试表征,并采用极化曲线、交流阻抗谱和耐盐水性试验评价涂层的防腐效果。结果表明,当AT的含量为8%(AT占TEPA和AT总量摩尔分数)时,乳液平均粒径为140 nm,热失重在10%的分解温度为196℃,涂层在划叉耐盐水试验中96 h内没有出现起泡现象,通过计算腐蚀电流密度可知其缓蚀效率达到了98.6%,表现出优异的防腐性能。

Soluble aniline trimer(AT)was prepared by chemical oxidation method.Subsequently,an aniline trimer modified sulfonate waterborne epoxy curing agent was prepared using sulphamate(AT),epoxy resin(E-51)and the mixture of single terminated aniline trimer(AT-660 a)and tetraethylenepentamine(TEPA-660 a).The structure and properties of the polymer were characterized by FT-IR,TEM and TG;and anticorrosion effect of the coating was evaluated by the polarization curve,AC impedance spectroscopy and salt water resistance test.The results show that when the content of AT is 8%(AT accounts for the total molar fraction of TEPA and AT),the average particle size of the emulsion is 140 nm,the decomposition temperature at 10%mass loss is 196℃,no blister is found on the surface of the coating after 30 d cross scratch neutral salt spray test and the corrosion inhibition efficiency reaches 98.6%.The film shows good corrosion resistance.