Separation of polyamide 66 from mixtures with cellulose fibers by selective dissolution in calcium chloride-ethanol-water solvent,Journal of Applied Polymer Science

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Separation of polyamide 66 from mixtures with cellulose fibers by selective dissolution in calcium chloride-ethanol-water solvent
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2023-03-02 , DOI: 10.1002/app.53813
Avinash P. Manian ₁ , Felix E. Kraegeloh ₁ , Doris E. Braun ₂ , Amalid Mahmud‐Ali ₁ , Thomas Bechtold ₁ , Tung Pham ₁

Affiliation

The investigation focused on the separation, through selective dissolution, of polyamide 66 (PA 66) from mixtures with cellulose fibers with calcium chloride-ethanol-water (CEW). The dissolved PA 66 was reprecipitated by addition of water. Analysis of the cellulose after separation revealed no change in mechanical strength, suggesting the polymer was undamaged by the treatment. There were residues of the polyamide retained on the cellulose, but a substantial proportion could be removed by carding. About 80–90% of the PA 66 originally present in the mixtures was recovered. Effective removal of calcium residues from the recovered PA 66 is found to be critical, as calcium contents of greater than ca. 0.8 wt% in the polymer is observed to change the melt behavior. These investigations are being conducted in the broad context of fiber-to-fiber recycling from textiles, and will be followed up by investigations on the impact and fate of colorants present in the fibers.

中文翻译：

通过在氯化钙-乙醇-水溶剂中的选择性溶解从与纤维素纤维的混合物中分离聚酰胺 66

调查的重点是通过选择性溶解从纤维素纤维与氯化钙-乙醇-水 (CEW) 的混合物中分离聚酰胺 66 (PA 66)。通过添加水使溶解的 PA 66 再沉淀。分离后的纤维素分析显示机械强度没有变化，表明聚合物未因处理而受损。纤维素上保留有聚酰胺残留物，但大部分可通过梳理去除。最初存在于混合物中的 PA 66 约有 80–90% 被回收。发现从回收的 PA 66 中有效去除钙残留物是至关重要的，因为钙含量大于 ca。观察到聚合物中 0.8 wt% 会改变熔体行为。

更新日期：2023-03-02

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