Air gap spinning of a cellulose solution in [DBNH][OAc] ionic liquid with a novel vertically arranged spinning bath to simulate a closed loop operation in the Ioncell® process,Journal of Applied Polymer Science

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Air gap spinning of a cellulose solution in [DBNH][OAc] ionic liquid with a novel vertically arranged spinning bath to simulate a closed loop operation in the Ioncell® process
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-08-24 , DOI: 10.1002/app.49787
Chamseddine Guizani ₁ , Sauli Larkiala ₁ , Kaniz Moriam ₁ , Daisuke Sawada ₁ , Sherif Elsayed ₁ , Sami Rantasalo ₁ , Michael Hummel ₁ , Herbert Sixta ₁

Affiliation

A novel, small‐volume vertically arranged spin bath was successfully developed for an air gap lyocell‐type spinning process. A maximum regeneration bath length with a minimum free volume characterizes the concept of the new spin bath. Using the ionic liquid (IL) 1,5‐diazabicyclo[4.3.0]non‐5‐enium acetate [DBNH][OAc], the spin bath showed very good spinning performances of IL‐cellulose dopes at high draw ratios and spinning duration for single filament spinning experiments. Using this new device, it was possible to get a step further in the optimization of the Ioncell® process and simulate a process closed loop operation by performing single filament spinning in IL/H₂O mixtures. Good dope spinnability and preserved fibers mechanical properties were achieved in a coagulation bath containing up to 30 wt% IL. It is only at 45 wt% of IL in the bath that the spinnability and fibers mechanical properties started to deteriorate. The fibers fibrillar structure was less pronounced in IL‐containing spinning bath in comparison to a pure water bath. However, their crystallinity after washing was preserved regardless of the spinning bath composition. The results presented in this work have a high relevance to the upscaling of emerging IL‐based cellulose dissolution and spinning processes.

中文翻译：

用新型垂直排列的纺丝浴对[DBNH] [OAc]离子液体中的纤维素溶液进行气隙纺丝，以模拟Ioncell®工艺中的闭环操作

针对气隙莱赛尔型纺丝工艺成功开发了一种新颖的小批量垂直排列的旋转浴。最大的再生浴长度和最小的自由体积体现了新型旋转浴的概念。使用离子液体（IL）1,5-二氮杂双环[4.3.0]非5-乙酸铵[DBNH] [OAc]，旋转浴在高拉伸比和纺丝时间下显示出非常好的IL-纤维素浓液纺丝性能。用于单丝纺丝实验。使用这种新设备，可以通过在IL / H _2中进行单丝纺丝，进一步优化Ioncell®工艺并模拟工艺闭环操作。O混合物。在包含高达30 wt％IL的混凝浴中，可以实现良好的浓液可纺性和保留的纤维机械性能。仅在浴液中IL的45重量％下，可纺性和纤维机械性能开始恶化。与纯水浴相比，含IL的纺丝浴中的纤维原纤维结构不太明显。但是，无论纺丝浴的组成如何，都可以保持洗涤后的结晶性。这项工作中提出的结果与新兴的基于IL的纤维素溶解和纺丝工艺的升级具有高度相关性。

更新日期：2020-08-25

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