用于热镀铝锌钢板表面的自由基紫外光固化钝化膜研究

Research on Free Radical UV-Curable Passivation Film on the Surface of Hot-Dip Aluminum-Zinc Coated Steel Plate

为制备热镀铝锌钢板用紫外光固化涂料,以三羟甲基丙烷三丙烯酸酯(TMPTA)和2-苯氧乙基丙烯酸酯为活性稀释剂,改性环氧丙烯酸酯和改性聚酯丙烯酸酯按一定比例的混合物为低聚物,2-甲基-1-[4-(甲硫基)苯]-2-吗啉丙酮(907)作为自由基光引发剂,异丙基硫杂蒽酮(ITX)为增感剂,用高压汞灯作为辐射光源,复配出自由基光固化配方,并将其涂覆到热镀铝锌板表面上,固化后通过中性盐雾试验、电化学测试等手段对钝化膜进行表征。结果表明:该体系钝化膜层可以在600 mJ/cm^(2)的能量下固化,钝化膜常规性能以及耐中性盐雾腐蚀(NSST)性能均可达到热镀铝锌板下游用户的基本要求。

This paper aims at preparing UV-curable coatings for hot-dip aluminum-zinc coated steel plates. Using trimethylolpropane triacrylate(TMPTA) and 2-phenoxyethyl acrylate as active diluents, the mixture of modified epoxy acrylate and modified polyester acrylate in a certain proportion as the oligomer, 2-methyl-1-[4-(methylthio)benzene]-2-morpholinacetone(907) as the free radical photoinitiator, and isopropyl thioxanthone(ITX) as the sensitizer, the free radical light curing agent formula was compounded using high pressure mercury lamp as radiation source. The as-obtained light curing agent was coated on the surface of hot-dip aluminum-zinc coated steel plate. After curing treatment, the passivation film was characterized by neutral salt spray testing, electrochemical testing and other means. Results showed that the passivation films of this system could be cured at an energy of 600 mJ/cm^(2), and their general performance and resistance to neutral salt spray test(NSST) were able to meet the basic requirements of downstream users of hot-dip aluminum-zinc coated steel plate.