亚临界水介质回收酸酐固化环氧树脂/碳纤维复合材料

Recycling of Carbon Fiber Reinforced Epoxy Resin Cured with Anhydride in Subcritical Water

研究了不同添加剂对碳纤维增强酸酐固化环氧树脂复合材料在亚临界水中降解的影响,通过IR、GC-MS等分析,确定了环氧树脂的分解机理主要为酯键的断裂。结果表明,KOH与苯酚对酸酐固化环氧树脂的分解没有协同效应,碱性物质更有利于酯键的断裂。甲基四氢邻苯二甲酸酐固化的环氧树脂增强碳纤维复合材料在反应温度为250℃、反应时间为60 min、KOH浓度为0.2 mol/L时可完全分解,回收碳纤维的拉伸强度和表面形貌未受影响。

Effect of additives on the decomposition behavior of the carbon fiber reinforced epoxy resin cured with anhydride in subcritical water was investigated. IR and GC-MS results show that the decomposition is ascribed to cleavage of ester bond. KOH and phenol does not exhibit the synergetic effect on the decomposition of anhydride cured epoxy resin. Alkaline conditions are found to be favorable to the cleavage of ester linkages. The carbon fiber reinforced methyl-tetrahydrophalic anhydride（MeTHPA） cured epoxy resin composite was totally decomposed with the addition of 0.2 mol/L KOH at 250 ℃ for 60 min. The tensile strength and morphology of the recycled carbon fibers are not influenced.