曼尼希改性三乙烯四胺固化剂的合成及性能研究

摘要

This paper has reported a new kind of triethylene tetramine (TETA) type curing agents for epoxy resin were chemically modified by Mannich reactions. Dependence of their properties on the components of curing agents was studied. It was found that modified TETA curing agents with suitable viscosity, appropriate amine values, and a free phenol content of ＜5％ (by wt) ,can be prepared by using optimum composition of raw materials, which showed much better physical chemical properties and also environmental effects.%对三乙烯四胺(TETA)环氧树脂固化剂进行了曼尼希(Mannich )改性及其固化性能的研究.实验结果表明:曼尼希固化剂最佳合成条件为n(TETA):n(苯酚):n(甲醛)=1.5:1:1,反应温度为80℃,反应时间4h,可制备出具有合适的黏度、适中的胺值以及游离酚含量小于5%的改性环氧树脂固化剂;其比未改性的三乙烯四胺有优异的物理化学性能和环保性能.固化剂与水不互容,不能与乳化环氧树脂互容,可用无水乙醇作为溶剂,得到良好的效果.