摘要： 用环氧树脂E12为基体,配合酚类固化剂及其他助剂,经熔融共混制备出低温固化环氧粉末涂料。考察了固化剂、促进剂用量等对体系固化性能、附着力及耐冲击性的影响,并通过非等温差示扫描量热法及红外光谱研究了酚羟基/环氧体系的固化反应。实验结果表明:随着固化剂用量增加,涂膜耐冲击性能先提高后减小;随着促进剂用量的增加,体系固化温度降低,附着力和耐冲击性提高。固化剂、促进剂最佳用量分别为环氧树脂E-12用量的20%和2.0%。

关键词: 环氧, 低温固化, 粉末涂料, 固化行为

Abstract: A series of low temperature curing epoxy powder coating were prepared via melt blending method using epoxy resins as matrix in addition to phenolic curing agent and other additives. The effect of the amount of curing agent and accelerant on the curing reaction, adhesion and impact resistance of powder coatings was investigated. Meanwhile the curing reaction of phenols/epoxy system was analyzed using non-isothermal differential scanning calorimetry method and Fourier transform infrared spectroscopy (FT-IR). The experimental results indicated that the increase of curing agent content allowed the impact resistance of cured film to increase first and then decrease. The increase of accelerant content led to the decrease of the curing temperature and to the increase of adhesive and impact resistance. The optimum content of phenolic curing agent and accelerant was 20% and 20%respectively ( based on the epoxy weight).

Key words: epoxy, low temperature curing, powder coating, curing behavior