廃棄されたCFRPからリサイクルする再生炭素繊維の抽出条件　-射出成形品に利用するための最適抽出温度条件-

抄録

The purpose of this study is to investigate the proper temperature condition in extracting carbon fibers as the reinforcement of composite molded by injection method. Recycled carbon fibers were extracted from the wasted CFRP (Carbon Fiber Reinforced Plastic) by pyrolyzing the epoxy matrix of CFRP under air atmosphere under temperature condition at 400, 600 and 800℃ in this study. Recycled carbon fiber/polypropylene (RCF/PP) pellets were prepared using twin screw extruder to mold the RCF/PP specimens with dumbbell shape by injection machine. The mechanical properties of RCF/PP specimen were determined by tensile tests, and the fiber length and fiber orientation in RCF/PP specimen were measured, while the fracture toughness of RCF/PP specimen was also investigated. The tensile strength of recycled carbon fiber was decreased with rising pyrolysis temperature from 400 to 800℃. However, superior mechanical properties of tensile strength of RCF/PP specimen (with 30wt% of reinforcement) were obtained when the extracting temperature was 600℃. Almost fibers in RCF/PP specimens were aligned in the mold filling direction and the largest fracture toughness of RCF/PP the specimen was also obtained, in this study, when the extracting temperature was 600℃. The temperature condition at about 600℃ should be selected in extracting carbon fibers as the reinforcement of RCF/PP composite molded by injection method, for current material system.