新型环氧树脂增韧稀释剂的性能研究

采用国产669环氧稀释剂与聚氨酯预聚物反应合成了含有端环氧基聚醚氨酯的环氧树脂增韧稀释剂(U669)。将该化合物与环氧树脂(E51)共混,并分别采用氰乙基化己二胺和593#固化,通过力学性能测试,研究了U669含量对固化物性能的影响,并采用扫描电镜观察了断面微观结构。结果发现:其固化物具有海岛结构;2种固化体系的剪切强度在E51/U669质量比为60/40时达到极值,分别为21.91MPa和16.21MPa;采用593#作固化剂,在E51/U669质量比为80/20时,共混固化物的拉伸强度和弯曲强度达到最大值62.63MPa和97.37MPa;采用氰乙基化己二胺固化的体系的断裂伸长率和冲击性较593#固化体系好,其最大断裂伸长率达120.98%,当U669质量分数大于50%时,固化物具有弹性体的特征。

Study on the properties of a novel epoxy toughening diluent

A novel epoxy toughening diluent(U669) contaning epoxy terminated polyurethane was synthesized by the reaction of urethane prepolymer and domestic epoxy diluent 669.The blends of epoxy resin(E51) and U669 were cured with acetonitrile-hexane diamine and 593# respectively.The effect of U669 content on the properties of curing procucts was studied by mechanical property test and the fracture microstucture was observed by SEM.The results showed that the curing procuct had island structure.The shear strength of the two systems with the E51/U669 mass ratio 60/40 reacheed the maximum 21.91MPa and 16.21MPa respectively.The tensile strength and flexural strength of the system with E51/U669 mass ratio 80/20 cured with 593# reached the maximum 62.63MPa and 97.37MPa respectively.The elongation at break and impact strength of acetonitrile-hexane diamine system were better than that of 593# system and the maximum elongation at break was 120.98%.When the content of U669 was more than 50%,the cured composites has elastomer characteristics.