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生物基聚氨酯涂层织物的选择性溶剂分解

Selective Solvolysis of Bio-Based PU-Coated Fabric.

作者信息

De Smet David, Verjans Jente, Vanneste Myriam

机构信息

Centexbel, Technologiepark 70, 9052 Zwijnaarde, Belgium.

出版信息

Polymers (Basel). 2022 Dec 13;14(24):5452. doi: 10.3390/polym14245452.

Abstract

Polyurethane (PU) coatings are widely applied on high performing textiles due to their excellent durability and mechanical properties. PUs based on renewable resources were developed to improve the environmental impact of coatings by decreasing the carbon footprint. However, at the end-of-life, PU-coated textiles still end up as landfill or are incinerated since PUs are not biodegradable and are not being recycled at this moment. Therefore, the recycling of PU-coated substrates needs to be examined. This study reports the selective solvolysis of a polyester (PET) fabric coated with a bio-based PU using a 70% ZnCl aqueous solution. This method allowed the easy separation of the coating from the fabric. The thermal, chemical and mechanical characteristics of the virgin PET and recycled PET were examined via tensile strength tests, IR, TGA, DSC and GPC. Analysis of the fractions after solvolysis revealed that the PU was converted into the original polyol and an amine, corresponding to the isocyanate used for PU synthesis.

摘要

聚氨酯(PU)涂层因其优异的耐久性和机械性能而广泛应用于高性能纺织品。基于可再生资源的聚氨酯被开发出来,以通过减少碳足迹来改善涂层对环境的影响。然而,在使用寿命结束时,涂有聚氨酯的纺织品最终仍会被填埋或焚烧,因为聚氨酯不可生物降解且目前未被回收利用。因此,需要研究涂有聚氨酯的基材的回收利用。本研究报告了使用70%的氯化锌水溶液对涂有生物基聚氨酯的聚酯(PET)织物进行选择性溶剂分解。该方法使涂层易于从织物上分离。通过拉伸强度测试、红外光谱(IR)、热重分析(TGA)、差示扫描量热法(DSC)和凝胶渗透色谱法(GPC)对原始PET和回收PET的热、化学和机械特性进行了研究。溶剂分解后各馏分的分析表明,聚氨酯被转化为原始多元醇和一种胺,与用于聚氨酯合成的异氰酸酯相对应。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c872/9788366/830e8e1d3dca/polymers-14-05452-g001.jpg

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