研究聚酰胺/CaCl2 复合物的解络合以从纺织废料中绿色、无损地回收聚酰胺,Journal of Applied Polymer Science

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研究聚酰胺/CaCl2 复合物的解络合以从纺织废料中绿色、无损地回收聚酰胺
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2021-05-20 , DOI: 10.1002/app.51170
Barbara Rietzler ₁ , Avinash P. Manian ₁ , Dorian Rhomberg ₁ , Thomas Bechtold ₁ , Tung Pham ₁

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“循环经济”概念设想从资源中获得最大价值并将浪费减少到最低限度。在纺织品中，这包括从旧衣服中回收纤维材料，并将其重新用于制造新衣服。应用了机械分离、解聚处理和单个聚合物的选择性溶解等工艺。我们研究了使用溶剂体系 CaCl ₂从混合纺织废料中选择性无损溶解和回收聚酰胺纤维的方法/乙醇/水 (CEW) 基于聚酰胺 (PA) 的络合和解络合。结果表明，通过简单地加入水，PA 被沉淀和解络，并且通过络合去除了大量先前掺入的钙。回收的聚酰胺显示出类似于原始聚酰胺的特性。对聚酰胺/羊毛混合纺织废料模型的研究表明，CEW 处理可以成功地分离不同的纤维材料。使用 CEW 溶解 PA 的无损方法清楚地显示了好处，即 PA 纤维可以通过受控络合/解络合分离而不降解，从而避免再聚合步骤。此外，溶剂系统由大量可用的材料制成，这些材料价格低廉且广泛用于工业规模操作。因此，

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Investigation of the decomplexation of polyamide/CaCl2 complex toward a green, nondestructive recovery of polyamide from textile waste

The ‘circular economy’ concept envisages deriving the maximum value out of resources and reducing waste to a minimum. In textiles, that includes the recovery of fiber materials out of used clothing and reusing them in the construction of new clothes. Processes such as mechanical separation, depolymerization treatment, and selective dissolutions of individual polymers are applied. We investigate the approach of selective nondestructive dissolution and recovery of polyamide fiber from mixed textile waste by using the solvent system CaCl₂/ethanol/water (CEW) based on complexation and decomplexation of polyamide (PA). The results show that PA is precipitated and decomplexed by simple addition of water and a substantial amount of previously incorporated calcium by complexation, is removed. The recovered polyamide shows properties similar to pristine polyamide. Investigation on a mixed textile waste model of polyamide/wool demonstrates that CEW treatment can successfully separate different fiber materials. The nondestructive approach in dissolving PA using CEW, clearly shows the benefit, that PA fiber can be separated by controlled complexation/decomplexation without degradation, thus avoiding the repolymerization step. Furthermore, the solvent system is made of abundantly available materials that are inexpensive and used widely in industrial-scale operations. Thus, the concept will make significant contribution to a green textile recycling approach.

更新日期：2021-07-16

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