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采用预聚合、B阶树脂合成及机械共混工艺制备了一种高温固化环氧基体树脂,探讨了增韧剂-端羧基液体橡胶(CTBN)用量对基体树脂韧性和耐热性的影响。试验结果表明:当CTBN的用量为5phr,且与环氧树脂采用预聚合方式制得的基体树脂获得了较高的耐热性和韧性,玻璃化转变温度为189℃,冲击强度达到了26.12kJ/m2;制得的基体树脂具有较好的黏温特性和力学性能,满足环氧基复合材料的成型工艺和综合性能要求。
A high temperature curing epoxy matrix resin was prepared by prepolymerization, B-staged resin synthesis and mechanical blending process. The effects of the amount of toughening agent-terminal carboxyl liquid rubber (CTBN) on the toughness and heat resistance of matrix resin were discussed. The results show that when the amount of CTBN is 5 phr and the matrix resin prepared by prepolymerization with epoxy resin has high heat resistance and toughness, the glass transition temperature is 189 ℃ and the impact strength reaches 26.12kJ / m2; the prepared matrix resin has good viscosity-temperature properties and mechanical properties to meet the epoxy composite molding process and the overall performance requirements.