RO膜外壳用环氧树脂/双氰胺树脂体系的反应机理

Reaction mechanism of epoxy resin / dicyandiamide resin system for RO membrane shell

双氰胺(DCD)是一种常用的潜伏性固化剂,环氧树脂(EP)/双氰胺树脂体系可用于分离膜外壳的生产中,对环氧树脂/双氰胺树脂体系的反应机理进行了分析.利用差示量热法得到固化反应过程曲线和固化物松弛过程曲线,对反应前后树脂体系进行红外光谱分析,采用模型拟合法研究了固化反应机理和反应行为,计算出固化反应活化能为60.2 kJ/mol,固化物松弛过程所需的活化能为12 515 kJ/mol.

The epoxy resin and dicyandiamide system has been popular in water treatment field,while the dicyandiamide is commonly as latent curing agent.The principle of curing reaction was analysed.The curves of curing reaction process and relaxation process were obtained by differential calorimetry(DSC),and resin systems before and after the reaction were analyzed by IR.According to characteristics of molecular structure,the model fitting method was chosen to study principle and behavior of curing reaction.The activation energy of curing reaction was calculated to be 60.2 kJ/mol,while the activation energy of relaxation process of solidified compounds was 12 515 kJ/mol.