以碳纤维/高温环氧(CF/HTEP)预浸料为原料,采用两步高温热分解方法裂解回收碳纤维增强高温环氧树脂复合材料中的碳纤维。第一步将CF/HTEP预浸料样品在不同温度的氮气保护下进行热分解;第二步将第一步处理过的样品在600℃空气中热分解处理。通过分析天平称量热分解前后样品的质量变化,计算基体树脂分解率;采用电镜观察不同样品的表面形貌;采用单丝拉伸性能测试回收碳纤维的力学性能。结果表明,通过两步高温热处理方法能够使基体树脂完全分解,获得表面质量良好的回收碳纤维;在850℃氮气中热处理120min,再在600℃空气中处理20min获得的回收碳纤维力学性能最好,拉伸强度保留90.4%。
In this paper,carbon fiber/high-temperature epoxy (CF/HTEP) prepreg was used as raw material to recover carbon fibers from the carbon fiber enhanced high temperature epoxy resin composites by using a two-step method high-temperature heat treatment method.The first step was that the CF/HTEP prepreg samples were thermally decomposed under nitrogen protection at different temperatures,and the second step was that the treated samples in the first step were thermally decomposed in air at 600℃.The mass change of the samples before and after thermal decomposition was analyzed using a balance to calculate the decomposition ratio of matrix resin,the surface morphology of different samples was observed by electron microscope,and the mechanical properties of recovered carbon fibers were characterized by the single-filament tensile performance test.The results showed that the matrix resin could be completely decomposed by two-step high temperature heat treatment method.The best mechanical properties of the recovered carbon fibers obtained by heat treatment in 850℃ nitrogen for 120min and then in 600℃ air for 20min,with a tensile strength retention of 90.4%.
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基金资助
国家重点研发计划项目(2020YFC1910203)
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