摘要
以一缩二乙二醇作为醇解剂对聚氨酯涂料废弃物进行醇解,回收低分子量的多元醇,并将再生多元醇与商用多元醇混合作为原料制备再生聚氨酯泡沫。采用FTIR、GPC、TG及SEM等对再生多元醇及再生聚氨酯泡沫进行了分析测试表征,对再生多元醇及再生聚氨酯泡沫进行表征分析。通过正交试验获得了最优工艺参数,并进一步将再生多元醇与商用多元醇混合,验证其性能。结果表明,再生多元醇与聚醚多元醇在分子结构上具有一致性,且符合制备聚氨酯泡沫的性能要求;正交试验获得的最优工艺参数为:反应试剂比1∶2,反应温度180℃,反应时间2 h,催化剂添加量1.3%,在此条件下,醇解产物的提取率为36.8%,羟值为384.6 mgKOH/g,黏度为476 mPa·s;当再生多元醇在总多元醇中的比例为33%时,所制备聚氨酯具有良好的孔隙结构及热稳定性。
The polyurethane coating waste was chemically degraded using mono⁃diethylene glycol(DEG)as an alcoholo⁃lytic agent to recover low molecular weight polyol,and the recovered polyol was mixed with commercial polyol as a raw material to prepare recycled polyurethane foam.The optimum parameters were determined as follows:reaction reagent ratio of 1∶2,reactiontemperature of 180℃,reaction time of 2 h,catalyst addition of 1.3%,under which the extraction rate of the alcoholysis product was 36.8%,hydroxyl value of 384.6 mgKOH/g,and viscosity of 476 mPa·s.The re⁃sults were obtained by Fourier transform infrared spectroscopy,gel permeation chromatography,thermogravimetric anal⁃ysis,and scanning electron microscopy.The recovered polyol and recycled polyurethane foam were characterized and an⁃alyzed by FTIR,GPC,TG and SEM.The results showed that the recovered polyol and polyether polyol were consis⁃tent in molecular structure and met the performance requirements for the preparation of polyurethane foam.When the re⁃cycled polyol was mixed with the commercial polyol,and the proportion of recycled polyol in the total polyol was 33%,the prepared polyurethane had good pore structure and thermal stability.
作者
李国华
方学镇
沈祝
张欣宇
王静娴
LI Guohua;FANG Xuezhen;SHEN Zhu;ZHANG Xinyu;WANG Jingxian(Zhejiang University of Technology,School of Chemical Engineering,Huzhou 313000,China)
出处
《中国塑料》
CAS
CSCD
北大核心
2024年第3期79-85,共7页
China Plastics
基金
浙江工业大学横向项目(KYY-HX-20190025)。
关键词
聚氨酯
涂料
醇解
多元醇
回收
再生
polyurethane
coating
alcoholysis
polyol
recycling
regeneration
