高温快速固化高相对分子质量韧性环氧树脂研究

Study on a high molecular weight type toughness epoxy resin with fast curing under high temperature condition

采用己二酸和对苯二酚对液态低Mn(相对分子质量)的EP(环氧树脂)进行扩链改性,合成了含柔性链段的高Mn固体EP。采用差示扫描量热(DSC)法对韧性EP/酚类固化剂体系的反应活性和固化反应动力学进行了研究。结果表明:韧性EP的环氧值(0.165)和软化点(77℃)均高于市售EP,其反应活性较高(140℃时凝胶时间仅为79 s,200℃时凝胶时间已缩短至16 s),并且韧性EP因软化点较高而不会结块,故其完全满足防腐粉末涂料高温快速固化的使用要求。采用Kissinger法、Ozawa法和Crane法等计算出该固化体系的反应活化能为73.10 kJ/mol,反应级数为0.932。

A high Mn（molecular weight） type solid epoxy resin（EP） with soft chain segment was prepared by hexane diacid and hydroquinone as chain extender and modifier of liquid low Mn type EP.The reaction activity and curing reaction kinetics of toughness EP/phenolic type curing agent system were investigated by differential scanning calorimetry（DSC）.The results showed that the epoxy value（0.165） and softening point（77 ℃） of toughness EP were higher than those of marketing EP.The reaction activity of toughness EP was higher because its gelling time was shortened from 79 s at 140 ℃ to 16 s at 200 ℃,so the toughness EP,which will not be agglomerated because of higher softening temperature,could fully meet the application requirement of fast curing under high temperature condition for anti-corrosion powder coating.The activation energy（73.10 kJ/mol） or reaction order（0.932） of curing system could be calculated by Kissinger,Ozawa or Crane methods.