Structure and properties of spun-dyed lyocell fibers based on indigo dye

IF 4.9 2区工程技术 Q1 MATERIALS SCIENCE, PAPER & WOOD Cellulose Pub Date : 2024-08-29 DOI:10.1007/s10570-024-06142-x

Gesheng Yang, Su Wang, Kai Li, Huihui Zhang, Xiang Yao, Yaopeng Zhang

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Abstract

Spun-dyed lyocell fibers were prepared by mixing cellulose pulp with an indigo dye dispersion and subsequent spinning. The indigo dye dispersion was obtained by adding leuco indigo to N-methylmorpholine-N-oxide (NMMO) solution. The particle size of the indigo dye was controlled by adjusting the dispersion conditions. Furthermore, the application of ball milling resulted in a reduced average dye particle size of 222.3 nm. The structure and properties of the fibers were characterized using Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and strength testing. Indigo dye particles were distributed in the interior and surface of the fibers. Relative to the undyed fiber, the crystal structure of the colored fibers was unchanged, but the crystallinity and mechanical properties improved. The color strength and color fastness of the spun-dyed lyocell fibers were assessed according to industry standards. Increasing the dye content and reducing the dye particle size (via ball milling) increased the color strength of the fibers, and the color fastness to sun and soap washing was high (Gray card grade 5). Additionally, the dye did not diffuse into the spinning coagulation bath and thus did not affect the recovery of NMMO solvent. The present study demonstrates a viable strategy for preparing spun-dyed lyocell fibers.

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基于靛蓝染料的纺染莱卡纤维的结构和性能

通过将纤维素浆与靛蓝染料分散液混合，然后进行纺丝，制备出了纺染的纤维素纤维。靛蓝染料分散液是通过向 N-甲基吗啉-N-氧化物（NMMO）溶液中添加靛蓝而获得的。通过调整分散条件控制了靛蓝染料的粒度。此外，采用球磨法可将染料的平均粒径减小到 222.3 nm。利用傅立叶变换红外光谱、X 射线衍射、扫描电子显微镜和强度测试对纤维的结构和性能进行了表征。靛蓝染料颗粒分布在纤维的内部和表面。与未染色纤维相比，有色纤维的晶体结构没有变化，但结晶度和机械性能有所提高。根据行业标准评估了纺染莱卡纤维的着色强度和色牢度。增加染料含量和减小染料粒度（通过球磨）提高了纤维的着色力，耐日晒和皂洗的色牢度也很高（灰卡 5 级）。此外，染料不会扩散到纺丝凝固浴中，因此不会影响 NMMO 溶剂的回收。本研究证明了制备纺染溶胞纤维的可行策略。图文摘要

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来源期刊

Cellulose 工程技术-材料科学：纺织

CiteScore

10.10

自引率

10.50%

发文量

580

审稿时长

3-8 weeks

期刊介绍： Cellulose is an international journal devoted to the dissemination of research and scientific and technological progress in the field of cellulose and related naturally occurring polymers. The journal is concerned with the pure and applied science of cellulose and related materials, and also with the development of relevant new technologies. This includes the chemistry, biochemistry, physics and materials science of cellulose and its sources, including wood and other biomass resources, and their derivatives. Coverage extends to the conversion of these polymers and resources into manufactured goods, such as pulp, paper, textiles, and manufactured as well natural fibers, and to the chemistry of materials used in their processing. Cellulose publishes review articles, research papers, and technical notes.