一种可用于拉挤成型的改性苯并恶嗪树脂体系

将PM型苯并恶嗪与环氧树脂F-51按照质量比7∶3共混,加入适量的2-乙基-4-甲基咪唑作为固化剂,首次制备了能够适用于拉挤成型的树脂基体。采用凝胶时间测试,示差扫描量热分析,动态热机械分析(DMA)和力学性能测试研究了该树脂体系的粘度特性、固化行为和使用性能。结果表明,该体系150℃下的凝胶时间5 min,60℃粘度471 mPa.s,树脂浇注体的弯曲强度156.7 MPa,弯曲模量4.9 GPa,玻璃化转变温度180℃。该树脂体系具有凝胶快、粘度低以及较好的力学性能和耐热性等特点,能够满足拉挤成型工艺的要求。

A modified benzoxazine system for pultrusion molding process

The resin matrix resin for pultrusion molding process was prepared for the first time by blending PM type benzoxazine and epoxy resin F-51 according to the mass ratio 7∶3 and adding an appropriate amount of 2-ethyl-4-methylimidazole as a curing agent.The viscosity characteristics,curing behavior and performance of the resin system were investigated by the gel time testing,thermal analysis differential scanning calorimetry,dynamic mechanical thermal analysis(DMA) and mechanical property testings.The results were as followed: the gel time of the system at 150 ℃ 5 min,viscosity at 60 ℃ 471 mPa·s,flexural strength of the casting 156.7 MPa,flexural modulus 4.9 GPa and glass transition temperature 180 ℃.The resin system had quick gel time,low viscosity,good mechanical properties and heat resistance characteristics and could meet the requirements of pultrusion process.