含癸二酰胺的共聚酰胺固化剂的合成及性能

用癸二酸和二聚酸与多胺共缩聚合成了含癸二酰胺的共聚酰胺固化剂,研究了癸二酸加入量对合成固化剂胺值、粘度的影响,及对固化剂与环氧树脂E-44混合体系力学性能的影响。加入癸二酸后,树脂粘度有大幅度的下降,但癸二酸的加入量超过5%以后,合成的共聚酰胺固化剂粘度逐渐增加;产物的胺值与E-44的固化体系的固化度、拉伸强度和剪切强度都随癸二酸加入量的提高而提高。其凝胶时间缩短,比较发现,当癸二酸加入量为二聚酸加入量的20%时,与四乙烯五胺合成的固化剂各方面性能较好,其体系的粘度为二聚酸性聚酰胺的80%左右。在酸组分不变的情况下,混合体系的裂解温度随胺分子质量的增加而下降,失重率则相反。

The synthesis of copolyamide curing agents using dimer acid and sebacic acid and the performance of epoxy resins cured using it

The copolyamide curing agents were prepared by dimer acid,sebacic acid,and polyamines.The effect of usage of sebacic acid on value of amine and viscosity of the production and the performance of epoxy resin cured using it were also studied.The tests showed that with increasing the mass fraction of sebacic acid the viscosity of the product decreased greatly but increased progressively when the mass fraction of sebacic acid was more than 5%;amine value of the product and the curing degree,tensile and shear strength of epoxy resins cured using it increased but its gel time decreased.By comparison,the polyamide curing agent with better performance in every aspect was synthesized when the usage of sebacic acid was 20 percent of that of dimer acid and its viscosity was about 80% of that of dimer based polyamide.In the condition of the same acid component,as the molecule mass of polyamines increased,the pyrolysis temperature decreased and the weight losing percentage increased.