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The Recovery of Carbon Fiber from Carbon Fiber Reinforced Epoxy Composites Applied to Railway Vehicles  

Lee, Suk-Ho (부경대학교, 화학공학과)
Kim, Jung-Seok (한국철도기술연구원, 신소재틸팅열차시스템연구단)
Lee, Cheul-Kyu (한국철도기술연구원, 궤도토목연구본부)
Kim, Yong-Ki (한국철도기술연구원, 궤도토목연구본부)
Ju, Chang-Sik (부경대학교, 화학공학과)
Publication Information
Journal of the Korean Society for Railway / v.12, no.6, 2009 , pp. 1059-1066 More about this Journal
Abstract
Recently, the amount of thermosetting plastic wastes has increased with the production of reinforced plastic composites and causes serious environmental problems. The epoxy resins, one of the versatile thermosetting plastics with excellent properties, cannot be melted down and remolded as what is done in the thermoplastic industry. In this research, a series of experiments that decompose epoxy resin and recover carbon fibers from carbon fiber reinforced epoxy composites applied to railway vehicles was performed. We experimentally examined various decomposition processes and compared their decomposition efficiencies and mechanical property of recovered carbon fibers. For the prevention of tangle of recovered carbon fibers, each composites specimen was fixed with a Teflon supporter and no mechanical mixing was applied. Decomposition products were analyzed by scanning electron microscope (SEM), gas chromatography mass spectrometer (GC-MS), and universal testing machine (UTM). Carbon fibers could be completely recovered from decomposition process using nitric acid aqueous solution, liquid-phase thermal cracking and pyrolysis. The tensile strength losses of the recovered carbon fibers were less than 4%.
Keywords
Epoxy composite; Carbon fiber; Decomposition; Recycling; Tensile strength;
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