Meenakshisundaram Vaishali, Sathyaraj Gopal and Kalarical Janardhanan Sreeram
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引用次数: 0
摘要
服装行业广泛使用聚氨酯涂层织物,因为它们耐用、舒适、时尚且用途广泛。由于存在多层聚合物,回收此类织物的效率低、产量少,因此主要被丢弃在垃圾填埋场,造成严重的环境污染。在本文中,我们通过在室温下对粘合剂进行表面活性剂辅助碱处理,实现了聚氨酯(PU)涂层与聚对苯二甲酸乙二醇酯(PET)织物的精确分离。此外,通过索氏提取法连续提取织物中的染料,可从材料中去除 93% 的染料。获得的 PET 织物通过碱性水解程序进行水解,对苯二甲酸(TPA)的最高产率超过 80%,纯度超过 90%。从织物中去除染料被证明是回收 PET 织物的关键步骤,因为我们发现染色 PET 织物的纯度和产量明显降低。这项工作首次研究了服装行业常用的 PET 织物中聚合物涂层的分层情况。它将为其他此类聚合物涂层 PET 织物的回收利用提供有益的启示和方向。
A facile approach towards recycling of polyurethane coated PET fabrics†
The apparel industry widely uses polyurethane coated fabrics for their durability, comfort, style, and versatility. Due to the presence of multiple layers of polymers, recycling such fabrics results in low efficiency and poor yield; thus predominantly they are disposed of in landfills, resulting in severe environmental pollution. Herein we achieved a remarkably precise separation of the polyurethane (PU) coating as a neat film from the polyethylene terephthalate (PET) fabric through a surfactant-aided alkali treatment of the adhesive at room temperature. Furthermore, the dye from the fabric was continuously extracted through Soxhlet extraction resulting in 93% dye removal from the material. The PET fabric as obtained was hydrolyzed through an alkaline hydrolysis procedure with a maximum terephthalic acid (TPA) yield above 80% and purity above 90%. Dye removal from the fabric proved to be a crucial step in recycling PET fabrics as we found a notable reduction in the purity and yield of dyed PET fabrics. This work is the first to study the delamination of polymer coatings as neat films from PET fabrics commonly used in the apparel industry. It will provide useful insight and direction for recycling other such polymer-coated PET fabrics.