利用弱碱性芳香胺的重氮盐对间位芳族聚酰胺织物进行偶联着色

IF 2 4区 工程技术 Q3 CHEMISTRY, APPLIED
Hua Jiang, Jixian Song, Zhihua Cui, Weiguo Chen
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引用次数: 0

摘要

在使用传统染色方法处理时,间位芳纶纤维的染色性能较差。本研究利用弱碱性芳香胺的重氮盐,通过在偏苯二胺分子上原位构建偶氮发色团,在室温下对偏芳纶纤维进行着色。为了促进重氮盐渗透到间位芳纶纤维中,在着色过程中需要用二甲亚砜在 55°C 下预处理间位芳纶织物 30 分钟,并使用甲醇。因此,织物可染上深沉、匀称和坚固的棕色系列。偶氮发色团来自聚酰胺链的骨架。因此,染色织物具有良好的耐有机溶剂性以及良好至卓越的耐皂洗、耐摩擦和耐升华色牢度。对着色机理的研究表明,末端和中间的偏苯二胺分子是主要的偶联反应位点。当用重氮盐处理时,高活性的末端偏苯二胺分子首先发生反应,并生成在长波长区域具有吸收峰的发色团。然而,由于端基数量有限,这些发色团只能产生有限的颜色深度。如果使用过量的重氮盐,则主要色调可归因于基于大量中间偏苯二胺分子的偶氮发色团,尽管这些分子的反应活性低于末端偏苯二胺分子。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Coupling coloration of meta-aramid fabric utilising diazonium salts from weakly basic aromatic amines

Meta-aramid fibre exhibits poor dyeing performance when treated using conventional dyeing methods. In this study, coloration of meta-aramid fabrics was performed at room temperature utilising diazonium salts from weakly basic aromatic amines and was achieved via in situ construction of azo chromophores on the meta-phenylenediamine moiety. To promote diazonium-salt penetration into the meta-aramid fibre, the pretreatment of meta-aramid fabrics with dimethyl sulfoxide at 55°C for 30 min and the utilisation of methanol were involved during the coloration process. As a result, the fabrics could be coloured with deep, levelled and firm shades of brown series. The azo chromophore is derived from the skeleton of the polyamide chain. Therefore, the coloured fabrics exhibit good resistance to organic solvents as well as good to excellent colour fastness to soaping, rubbing and sublimation. A study of the coloration mechanism revealed that the terminal and middle meta-phenylenediamine moieties serve as the main coupling reaction sites. When treated with a diazonium salt, the highly reactive terminal meta-phenylenediamine moiety reacted first and generated chromophores with an absorption peak in the long-wavelength region. However, such chromophores only contributed a limited colour depth owing to the limited number of the terminals. If excess diazonium salts were used, the main hue can be attributed to the azo chromophores based on the massive middle meta-phenylenediamine moieties, although these moieties are less reactive than the terminal meta-phenylenediamine moieties.

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来源期刊
Coloration Technology
Coloration Technology 工程技术-材料科学:纺织
CiteScore
3.60
自引率
11.10%
发文量
67
审稿时长
4 months
期刊介绍: The primary mission of Coloration Technology is to promote innovation and fundamental understanding in the science and technology of coloured materials by providing a medium for communication of peer-reviewed research papers of the highest quality. It is internationally recognised as a vehicle for the publication of theoretical and technological papers on the subjects allied to all aspects of coloration. Regular sections in the journal include reviews, original research and reports, feature articles, short communications and book reviews.
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