Bleaching Scutched Flax Tow (SFT) With Ozone Process in Low Water Environment: Evaluation of Fiber Physicochemical Properties and Bleaching Performance

IF 2.2 4区 工程技术 Q1 MATERIALS SCIENCE, TEXTILES
Lin Zhang, Jiajia Fu, Weidong Gao, Xuerong Fan
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Abstract

Flax fibers contain naturally colored substances, which need to be removed by bleaching to produce excellent flax-based textiles in the subsequent process. However, the traditional bleaching process has the disadvantages of high temperature, large water consumption and high chemical oxygen demand (COD) value. Therefore, an appealing alternative to make flax fiber more sustainable is to design an environmentally friendly bleaching process, which has the advantages of low water usage, easy operation at ambient temperature and without addition of chemicals. In this paper, the influence of ozone bleaching on the optical property of flax fibers at different parameter conditions (reaction phase, ozone concentration, bleaching time, water pickup value, initial pH value) was investigated. The physicochemical properties of fiber samples after ozone bleaching were analyzed and compared with those of traditional bleached fibers. Results showed that the lightness and whiteness index of SFT-O3-Gas-70% increased to 80.85 and 53.33, yellowness index decreased to 10.14 (ozone concentration 20%, 20 min, WPV 70%, pH 2.0), which was comparable with the SFT-TMB (80.75, 51.87 and 11.33). SEM analysis showed that the non-cellulosic components (hemicelluloses and lignin) on the fiber surface were removed after bleaching treatment. The crystallinity and thermal stability of samples after bleaching treatment increased due to the removal of non-cellulosic components. Compared with the SFT-TMB (16.07 cN/tex and 1166), the tenacity and degree of polymerization (DP) of SFT-O3-Gas-70% decreased to 11.40 cN/tex and 779, respectively. The whole ozone bleaching process is under gas phase, normal temperature and pressure conditions, which greatly reduces water consumption and COD values of bleach wastewater. This study provides some guidance on the use of ozone for bleaching lignocellulosic fibers and the selection of cellulose protectants.

Abstract Image

在低水环境中使用臭氧工艺漂白灼烧亚麻簇(SFT):纤维理化特性和漂白性能评估
亚麻纤维中含有天然有色物质,需要通过漂白去除这些物质,才能在后续工艺中生产出优质的亚麻纺织品。然而,传统的漂白工艺存在温度高、耗水量大、化学需氧量(COD)值高等缺点。因此,要使亚麻纤维更具可持续性,一个有吸引力的替代方案是设计一种环保型漂白工艺,它具有用水量低、易于在常温下操作且无需添加化学品等优点。本文研究了不同参数条件(反应阶段、臭氧浓度、漂白时间、取水值、初始 pH 值)下臭氧漂白对亚麻纤维光学特性的影响。分析了臭氧漂白后纤维样品的理化性质,并与传统漂白纤维的理化性质进行了比较。结果表明,SFT-O3-Gas-70%的亮度和白度指数上升到80.85和53.33,黄度指数下降到10.14(臭氧浓度20%,20分钟,WPV 70%,pH 2.0),与SFT-TMB(80.75、51.87和11.33)相当。扫描电镜分析表明,漂白处理后纤维表面的非纤维素成分(半纤维素和木质素)已被去除。由于非纤维素成分的去除,漂白处理后样品的结晶度和热稳定性都有所提高。与 SFT-TMB(16.07 cN/tex 和 1166)相比,SFT-O3-Gas-70% 的韧性和聚合度(DP)分别降至 11.40 cN/tex 和 779。整个臭氧漂白过程是在气相、常温和常压条件下进行的,大大降低了漂白废水的耗水量和 COD 值。这项研究为使用臭氧漂白木质纤维素纤维和选择纤维素保护剂提供了一些指导。
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来源期刊
Fibers and Polymers
Fibers and Polymers 工程技术-材料科学:纺织
CiteScore
3.90
自引率
8.00%
发文量
267
审稿时长
3.9 months
期刊介绍: -Chemistry of Fiber Materials, Polymer Reactions and Synthesis- Physical Properties of Fibers, Polymer Blends and Composites- Fiber Spinning and Textile Processing, Polymer Physics, Morphology- Colorants and Dyeing, Polymer Analysis and Characterization- Chemical Aftertreatment of Textiles, Polymer Processing and Rheology- Textile and Apparel Science, Functional Polymers
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