Abstract: A kind of engineering grade retro-reflective sheeting coating was presented by using hydroxyl acrylate resin as basic material, amino resin as curing agent and phosphate acid as catalyst according to the specification requirements of engineering grade retro reflective sheeting. The influence of the mass ratios of basic material. curing agent and catalyst, and the curing conditions on the performance of the coating was investigated particularly. The results showed that the crosslinking could be basically fulfilled under conditions of 90℃ for 2 min and 130℃ for 8 min with the mass ratio of basic material, curing agent and catalyst of 100: 13: 0. 4, and the properties of the coating such as solvent resistance, acid fog resistance and aging resistance were good. The hydroxyl acrylate resin based coating prepared under the conditions of 90℃ for 2 min and 140℃ for 8 min could meet the requirements of engineering grade retro-reflective sheeting coating in terms of Yensile strength and extensibility.

Key words: hydroxy -acrylic resin, amino resin, acid catalysis, curing optimization

摘要： 按照工程级反光膜的性能要求选定了羟基丙烯酸树脂作为母体树脂,用氨基树脂作为固化剂,磷酸作为催化剂,对反光膜涂层的性能进行了研究,着重考察了母体树脂/固化剂/催化剂配比和烘烤条件对交联固化后的树脂表面涂层性能的影响。结果表明:当m(羟基丙烯酸树脂)∶m(氨基树脂)∶m(磷酸催化剂)=100∶13∶0.4时,在适当烘烤条件下(90℃×2 min+130℃×8 min)可使羟基丙烯酸树脂和氨基树脂的交联固化基本完成,涂层的耐溶剂擦拭性、耐盐雾性、耐老化性表现优异。当烘烤条件为90℃×2 min+140℃×8 min时,丙烯酸树脂固化涂层的拉伸强度和断裂伸长率能达到作为工程级反光膜表面涂层的要求。

关键词: 羟基丙烯酸树脂, 氨基树脂, 酸催化, 固化优化