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Processing of IONCELL-F-FIBRES in textile industries

机译：纺织工业中IONCELL-F-FIBRES的加工

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The increasing prosperity of the growing population increases the demand of cellulosic textile fibers, which can no longer be satisfied by the global growth of cotton and viscose capacities. However, with increasing environmental awareness also in the Asian countries, new abatement technologies have to be installed, which in turn impairs the economic feasibility against the new NMMO-based Lyocell fiber technology. In addition, NMMO-based Lyocell fibers, e.g. Tencel, reveal a better wearing comfort than viscose fibers owing to their superior moisture absorption/desorption behavior and the much better dimension stability under wet conditions. Despite the high patent coverage in the field of the NMMO-based Lyocell technology by the Lenzing AG, alternative technologies have been developed. However, NMMO, as a cellulose solvent, has some intrinsic shortcomings such as its chemical and thermal instability which affords the addition of stabilizers, but are no guarantees of avoiding dangerous runaway reactions. The extension of the Lyocell spinning technology to direct cellulose solvents of high thermal and chemical stability is very attractive from a safety, environmental and economic point of view. With the rediscovery of Ionic Liquids (ILs) as powerful cellulose solvents in 2002 by Rogers and his coworkers new research efforts were initiated to design task specific ILs aiming at the substitution of NMMO as the only commercial direct cellulose solvent. The ionic liquids, which proved to be effective cellulose solvents and thus have been used for the preparation of spinning dopes, were all imidazolium-based. It was shown that, compared with the NMMO process, the direct dissolution of cellulose is more easily controlled, the process is inherently safer, and fibers with properties equal to those produced from NMMO solution were obtained. However, the imidazolium-based ionic liquids have shown to be not inert towards cellulose. Depending on the substituents on the imidazolium ring and the chemical nature of the anion, cellulose underwent severe degradation, especially at higher temperatures (＞90℃) which again afforded the addition of stabilizers.
机译：日益增长的人口的繁荣增加了纤维素纺织纤维的需求，全球棉花和粘胶生产能力的增长已无法满足纤维素纺织纤维的需求。但是，随着亚洲国家环保意识的增强，必须安装新的减排技术，这反过来损害了基于新的基于NMMO的莱赛尔纤维技术的经济可行性。另外，基于NMMO的莱赛尔纤维，例如。由于其优异的吸湿/解吸性能以及在潮湿条件下具有更好的尺寸稳定性，Tencel具有比粘胶纤维更好的穿着舒适性。尽管Lenzing AG在基于NMMO的Lyocell技术领域拥有很高的专利覆盖率，但仍在开发替代技术。然而，作为纤维素溶剂的NMMO具有一些固有的缺点，例如其化学和热不稳定性，这使得需要添加稳定剂，但不能保证避免危险的失控反应。从安全，环境和经济的角度来看，将莱赛尔纺丝技术扩展为直接使用具有高热稳定性和化学稳定性的纤维素溶剂非常有吸引力。随着Rogers及其同事在2002年重新发现离子液体（ILs）作为强力纤维素溶剂，人们开始了新的研究工作，以设计特定任务的离子液体，旨在取代NMMO作为唯一的商业直接纤维素溶剂。被证明是有效的纤维素溶剂并因此已用于制备纺丝原液的离子液体全部基于咪唑鎓。结果表明，与NMMO工艺相比，纤维素的直接溶解更容易控制，该工艺本质上更安全，并且获得了性能与NMMO溶液相同的纤维。然而，已显示基于咪唑鎓的离子液体对纤维素不是惰性的。根据咪唑环上的取代基和阴离子的化学性质，纤维素会发生严重降解，尤其是在较高的温度（> 90℃）下，纤维素又添加了稳定剂。

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  • 来源
    《Colourage》 |2016年第9期|73-75|共3页
  • 作者

    N.N. Mahapatra;

  • 作者单位

    Colorant Ltd. 3225, Phase IV, G.I.D.C. Vatva, Ahmedabad - 382 445, Gujarat, India;

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