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    基于稳定同位素技术的混纺纱线染色行为

    Dyeing Behavior of Blended Yarns Based on Stable Isotope Technology

    • 摘要: 为揭示混纺纱线中多组分纤维的染色行为差异,采用稳定同位素技术结合常规表征方法,系统探究黏胶纤维(viscose)及黏胶/涤纶(viscose/polyester)混纺(黏胶纤维与涤纶纤维的质量比70/30)纱线在活性染料活性红(X-3B)体系中的染色机制。结果表明:随着染料用量的增加,黏胶/涤纶混纺纱线中的氢稳定同位素值(δD)出现贫化现象,而纯黏胶纱线则表现为小幅度富集,表明两种纤维在染色过程中的染色行为存在显著差异。氧稳定同位素值(\delta^18 \mathrmO )的变化幅度为1‰,活性染料对氧同位素有一定影响,但与染料用量无关。温度对染色效果影响较大,随着温度升高,\delta^18 \mathrmO 值回升,染料更多停留在纤维表面,减少了深度结合,低温有利于氢键的稳定,增强了染料的吸附能力。深度结合减少导致δD出现贫化趋势(从−60.4‰下降至−63.9‰)。碱浓度的增加使δD表现出贫化趋势,氢键的结合能力增强,染料与纤维的结合更加紧密,\delta^18 \mathrmO 的变化则较为复杂,受到多种因素的影响,从而无明显规律。在所有染色过程中,由于碳作为纤维基本骨架,碳稳定同位素值(\delta ^13\mathrmC )几乎不受影响。活性染料在染色过程中显著改变了纤维的氢和氧稳定同位素比例,且受染料用量、温度和碱浓度的共同调控。

       

      Abstract: To reveal the differences in dyeing behavior of multi-component fibers in blended yarns, the dyeing mechanism of viscose fiber and viscose/polyester blended yarn (70/30, a mass ratio of viscose fiber to polyester fiber) in the reactive dye X-3B system was systematically investigated, using stable isotope technology combined with conventional characterization methods. Results showed that as the dye concentration increased, the δD (hydrogen stable isotope value) in the viscose/polyester blended yarn exhibited a depletion phenomenon, while pure viscose fiber showed a slight enrichment, indicating significant differences in the dyeing behavior of the two fibers during the dyeing process. The variation range of \delta^18 \mathrmO (oxygen stable isotope value) was 1‰, indicating that reactive dyes have a certain impact on oxygen isotopes, independent of dye concentration. Temperature had a significant impact on the dyeing effect. As the temperature increased, \delta^18 \mathrmO rebounded, and more dye remained on the fiber surface, reducing deep binding. Low temperatures favored the stability of hydrogen bonds, enhancing the dye's adsorption capacity, while high temperatures increased fiber swelling, causing more dye to remain on the fiber surface and reducing deep binding, leading to a depletion trend in δD (decreasing from −60.4‰ to −63.9‰). Increasing the alkali concentration led to a depletion trend in δD, enhanced the binding ability of hydrogen bonds, and tightened the bond between dye and fiber, while the change in \delta^18 \mathrmO was more complex, influenced by various factors, and showed no obvious pattern. In all dyeing processes, \delta ^13\mathrmC (carbon stable isotope value) was hardly affected because carbon acts as the basic skeleton of the fiber. Therefore, reactive dyes significantly altered the hydrogen and oxygen stable isotope ratios of the fiber during the dyeing process, and were jointly regulated by dye concentration, temperature, and alkali concentration.

       

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