【摘要】 用丁酮作萃取溶剂 ,研究了环氧 /双氰胺粉末涂层自由膜在 160～ 2 30℃温度下经不同时间固化后的萃取固化度 ,分析了涂膜固化反应的动力学过程。在研究温度范围内 ,固化反应表现出单一的表观激活能。环氧 /双氰胺粉末涂料的固化反应相当复杂 ,既有环氧基与胺基的加成反应 ,又有体系中羟基与氰基的聚合反应。文中讨论了固化反应机理 ,澄清了两种反应的相对作用更多还原

【Abstract】 The degree of cure (DOC) of a new type of epoxy/dicyandiamide powder coatings was detected by using solvent extraction on the free film cured at temperatures from 160℃to 230℃ for different time and the kinetic process was analyzed. The results revealed that the cure reaction yielded a single Arrhenius activation energy (91.4kJ/mol), which indicated that there might be only one overall reaction mechanism in the range of the temperature tested. The cure reaction of epoxy/ dicyandiamide powder system was complex, involving two principal reactions between epoxide and amine hydrogen, and between hydroxyl groups and —CN. The cure mechanism was also discussed.更多还原