采用Hansen溶解度参数进行环氧固化体系的匹配

Matching of epoxy curing system using Hansen solubility parameters

实验测定了25～80℃时3种环氧树脂、3种改性树脂和3种固化剂在77种溶剂中的溶解情况,并经计算得到了相应的Hansen溶解球参数。利用树脂-改性树脂、树脂-固化剂、树脂-改性树脂-固化剂的Hansen溶解球的重叠率,可进行共溶剂的选择及防腐防污自分层涂料的树脂匹配和溶剂配方的选择;对于无溶剂的固化体系则由测得的溶解度参数计算Flory-Huggins相互作用参数χ12,进而计算其相平衡曲线或直接由χ12数值判断其相容性。根据实验结果,可以筛选得到符合制备自分层涂层要求的环氧树脂-改性树脂-固化剂匹配体系,并通过适当的混合溶剂配方,使得涂层中的树脂能有足够的时间进行扩散、分层,最终得到防腐防污性能最佳的效果。

Based on the solubilities of three kinds of epoxy resins and three kinds of modified resins and three kinds of curing agents in 77 kinds of solutions at 25-80℃ obtained by experiment, the Hansen solubility parameters of polymers were calculated. The solubility parameters can be used to calculate the overlap rate of epoxy resin- modified epoxy resin system, epoxy resin-curing agent system and epoxy resin- modified resin-curing agent system, which in turn can be used to calculate the Flory-Huggins interactive parameters x12. The results of the overlap rate were used to choose suitable co-solvents and solvent formulas. They could also be used to match different resins and prepare anticorrosive and antifouling self- stratifying coatings. The miscibility of the solvent-free curing system was predicted by the value of x12 or the phase equilibrium calculated by x12. The resins and curing agent system which form an anticorrosive and antifouling self-stratifying coating could be chosen from their experimental data of Hansen solubility parameters. If the modified resin had enough time to diffuse to the surface and stratify with the aid of an appropriate mixed solvent, optimum effect and performance of the coating could be obtained.