【摘 要】
：
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
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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。
Adopting adipic acid and hydroquinone to modify low molecular weight Mn (relative molecular mass) EP (chain extender) to synthesize high Mn solid EP with soft segment. The reaction activity and curing kinetics of the tough EP / phenolic curing agent system were studied by differential scanning calorimetry (DSC). The results showed that the epoxy value (0.165) and softening point (77 ℃) of ductile EP were higher than those of commercial EP, and their reactivity was high (gel time was only 79 s at 140 ℃, gel time at 200 ℃ Shortened to 16s), and toughness EP due to higher softening point will not caking, so it fully meet the anti-corrosion powder coating fast curing requirements. The Kissinger method, Ozawa method and Crane method were used to calculate the reaction activation energy of the cured system at 73.10 kJ / mol and the reaction order of 0.932.
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