文献类型：会议论文

英文题名：Performance of supercritical methanol in polyurethane degradation

作者：Liu, Lu[1];Tang, Lihua[1];Zhu, Zibin[1];Ni, Yanhui[1];Wu, Yongqiang[1]

机构：[1]East China Univ Sci & Technol, Res Inst Chem Technol, Shanghai 200237, Peoples R China

会议论文集：2nd International Conference on Chemical Materials and Process (ICCMP)

会议日期：MAY 11-13, 2016

会议地点：Copenhagen, DENMARK

语种：英文

外文关键词：Elastomers - Methanol - Organic solvents - Chemical analysis - Block copolymers

摘要：Polyurethane is a group of block copolymer which is composed of diisocyanate, chain extender, and polyol, including polyurethane foam, polyurethane elastomer, waterborne polyurethane, etc. This research focused on thermoplastic polyurethane elastomer (TPU) which is formed with 4,4'-diphenylmethane diisocyanate(MDI), poly(1,4-butanediol-hexanedioic acid) diolpolyester(PBA) and extended with 1,4-butanediol(BDO). The degradation of TPU was carried out with the help of methanol as the supercritical solvent. The SEM of the reaction residues revealed the process of the depolymerisation. The products were measured by GC-MS and found out to be PBA, BDO and 4,4'-methylene diphenyl carbamate (MDC) which is the methylate of MDI. GC-FID, HPLC-UV and GPC were used to further analysis. The experimental results showed that supercritical methanol performed outstandingly in TPU recycling, it needed lower temperature and shorter time than regular methods. At 230 degrees C/70min, over 90% raw materials of TPU could be recovered