碳纤维增强类玻璃环氧高分子复合材料闭环回收利用

为解决连续碳纤维增强树脂基复合材料(CFRP)回收再利用效率低、回收组分单一的问题,采用甲基四氢邻苯二甲酸酐、四氢邻苯二甲酸酐、催化剂乙酰丙酮锌和环氧树脂,制备出一种高性能的类玻璃环氧高分子树脂及其复合材料,经乙二醇参与酯交换反应,在180 ℃温度下对复合材料进行闭环回收。对原树脂、碳纤维和CFRP以及回收后的树脂、碳纤维和利用回收后树脂和碳纤维制备的CFRP的表观结构、热稳定性以及力学性能进行表征与分析。结果表明:该回收方法可完全回收和再加工复合材料的树脂与碳纤维;回收后树脂拉伸强度保持率为90.1%,碳纤维单丝拉伸强度保持率为98.9%,CFRP的弯曲强度和剪切强度保持率分别为86.2%和86.7%。

Carbon fiber reinforced epoxy based vitrimer composite material closed-loop recycling

In order to solve the problem of low recycling efficiency and single recycling component of continuous carbon fiber reinforced resin matrix composite material(CFRP),methyl tetrahydrophthalic anhydride,tetrahydrophthalic anhydride,catalyst zinc acetylacetonate and epoxy resin were used to prepare a high-performance epoxy based vitrimer resin and its composite material.A closed-loop recycling was conducted involving the transesterification reaction of ethylene glycol(EG)at 180℃.Ethylene glycol participates in the transesterification reaction,and the composite material is recovered in a closed loop at 180℃.The apparent structure,thermal stability and mechanical properties of raw resin,carbon fiber and CFRP,recovered resin,carbon fiber and CFRP prepared from recovered resin and recovered carbon fiber were characterized and analyzed.The results show that the recoverying method can completely recover and reprocess the resin and carbon fiber of the composite material.After recycling,the retention rate of the tensile strength of the resin is 90.1%,the retention rate of the tensile strength of the carbon fiber monofilament is 98.9%,and the retention rate of the flexural strength and shear strength of CFRP are 86.2%and 86.7%,respectively.