摘要
针对废弃碳纤维增强聚合物基复合材料(CFRP)在机械法回收过程中碳纤维长度和强度损失较高的难题,采用醋酸溶胀法改善CFRP机械加工性能,以降低碳纤维长度和强度损失,提高CFRP机械回收产物再利用价值。结果表明,CFRP中的固化环氧树脂(CEP)能够在醋酸介质中快速溶胀并发生轻微降解。CFRP在140°C醋酸中浸泡1 h会发生软化现象(树脂溶胀率和降解率分别为78.88%和4.49%),当温度提升至160~220°C后CFRP会发生分层现象(树脂溶胀率为101.54%~147.00%,降解率为9.08%~14.40%)。这些软化或分层产物易于被机械裁切成细条状、薄片状或其他各种形状。将烘干后的裁切产物或分层产物与适量未固化环氧树脂混合,采用热压法可重新制备CFRP。新制备的CFRP的抗弯强度可达到原始CFRP的47%~89%。本研究结果可为热固性环氧树脂复合材料绿色回收提供参考。
The losses of carbon fiber length and strength were high during the mechanical recycling process of the waste carbon fiber-reinforced polymer composite(CFRP).In response to this problem,acetic acid swelling method was used to improve the machinability of CFRP in order to reduce the losses of carbon fiber length and strength and improve the reuse value of CFRP mechanical recycled products.The results showed that cured epoxy resin(CEP) in CFRP could be fully swelled and slightly degraded in acetic acid medium.The stiff CFRP became soft in the acetic acid medium at 140 ℃(swelling ratio and degradation ratio were 78.88% and 4.49%,respectively),and it delaminated into soft single CFRP layers at 160 ℃–220 ℃ within 1 h(swelling ratio and degradation ratio were 101.54%~147.00% and 9.08%~14.40%,respectively).Thus,the swollen CFRP can be easily cut into long strips,large thin slices,or other customized shapes while the length and strength of the carbon fibers were preserved well.The shear and delamination products(after drying) were mixed with uncured epoxy resin and prepared into new CFRP products through hot pressing method.The flexural strength of reprepared CFRP boards can reach 47%~89% of the original CFRP board.This work can provide a green method for thermosetting composites recycling.
作者
李紫鑫
邢明飞
张东晖
关俊祥
蔡家贝
杨全振
LI Zixin;XING Mingfei;ZHANG Donghui;GUAN Junxiang;CAI Jiabei;YANG Quanzhen(Institute of Resource and Environment,Henan Polytechnic University,Jiaozuo 454000,China;Jiaozuo Environmental Monitoring Station,Jiaozuo 454000,China;Excavation team 2,No.12 coal mine,China Pingmei Shenma Group,Pingdingshan 467000,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2022年第6期1917-1924,共8页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(51508165)
河南省重点研发与推广专项(科技攻关)项目(212102310061)
河南理工大学青年骨干教师资助计划(2016XQG-04)。
关键词
碳纤维
固化环氧树脂
废弃复合材料
树脂溶胀
资源化
carbon fiber
cured epoxy resin
waste composites
resin swelling
resource utilization
