聚乙二醇/氯化锌条件下回收CFRP方法研究

以真空辅助成型工艺(VARI)制作的碳纤维增强复合材料(CFRP)平板件为降解试件,使用乙酸对其进行分层预处理,然后以聚乙二醇为溶剂,氯化锌为催化剂,采用控制变量法在不同的反应温度、反应时间,氯化锌浓度等工艺参数下对CFRP进行降解回收。利用扫描电子显微镜、X射线光电子能谱仪、动态接触角测量仪、纤维强度仪对回收碳纤维的表面形貌和元素、浸润性以及力学性能进行表征分析。结果表明,CFRP降解的理想工艺条件为:用乙酸于120℃下分层预处理30 min,然后在190℃下,使用浓度为0.6 mol/L氯化锌/聚乙二醇环境反应60 min。使用该方法回收的CFRP,树脂降解率能达到98%以上,碳纤维表面干净光滑无树脂残留,表面元素与原丝相比变化较小,碳纤维和水与乙二醇的浸润性相比原丝得到改善,碳纤维的弹性模量达到原丝的98%以上,拉伸强度达到原丝的97%以上。

Study on Recovery of Cfrp From Polyethylene Glycol/Zinc Chloride

Carbon fiber reinforced plastics(CFRP)plates made by vacuum assistant resin infusion process(VARI)were used as degradation specimens,which were stratified pretreated with acetic acid,and then treated with polyethylene glycol as solvent and zinc chloride as catalyst.CFRP degradation and recovery were carried out under different reaction temperature,reaction time,zinc chloride concentration and other technological parameters by control variable method.By using scanning electron microscope,X-ray photoelectron spectrometer,the dynamic contact angle measuring instrument,fiber strength tester for recycled carbon fiber surface morphology and element,invasive and the analysis of the mechanical properties were characterized.The results show that the ideal process conditions for degradation of CFRP are as follows:stratified pretreatment at 120℃for 30 min,followed by environmental reaction at 190℃with concentration of 0.6 mol/L zinc chloride/polyethylene glycol for 60 min.Using the method of recycling of CFRP,resin degradation rate can reach more than 98%,the carbon fiber surface clean,smooth resin residue,surface elements are small change compared with the original wire,carbon fiber and water and glycol invasive compared with the original wire improves,the elastic modulus carbon fiber reaches more than 98%of the original silk,the tensile strength reached more than 97%of the original silk.