热解法回收T300J碳纤维强度保留率影响因素研究

Influential factors on strength retention of recycled T300J carbon fiber by pyrolysis

以T300J碳纤维为增强体,E44环氧树脂为基体,三乙烯四胺为固化剂,制得T300J/E44碳纤维复合材料,并采用高温热解法回收T300J/E44复合材料中的T300J碳纤维,探索了不同的热解温度、热解保温时间、热解气氛,以及复合材料的损伤程度对回收的碳纤维的力学性能的影响。结果表明:在氮气保护(50 mL/min),热解温度为450℃,热解保温时间为30 min的高温解热工艺条件下,回收的碳纤维的表面良好,强度保留率可以达到96%;T300J/E44复合材料经预拉伸处理,纤维未拉断时,再热解回收获得的碳纤维的强度保留率仍可达到89%。

T300J/E44 carbon fiber composite material was prepared using T300J carbon fiber as reinforcement,E44 epoxy resin as matrix and triethylenetetramine as curing agent.T300J carbon fiber in T300J/E44 composite material was recycled by high-temperature pyrolysis.The effects of different pyrolysis temperatures,pyrolysis insulation time,pyrolysis atmosphere and the degree of damage to composite materials on the mechanical properties of recycled carbon fibers were explored.The results showed that the recycled carbon fibers had fairly good surface and the strength retention rate up to 96% under the high-temperature pyrolysis conditions of nitrogen protection(50 mL/min),pyrolysis temperature of 450 ℃,and pyrolysis insulation time of 30 min;and the strength retention rate of carbon fibers recycled from T300J/E44 composite material by pyrolysis could still reach 89% when the fibers were not broken under pre-stretching treatment.