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<p>In conventional dyeing of silk fabric with reactive dyes, a large amount of salt is utilized and remains in dyeing effluent. Here, we propose an eco-friendly salt-free dyeing of silk fabric with a reactive dye without deteriorating its tensile properties. Initially, low molecular weight sericin was modified with 2,3-epoxypropyltrimethylammonium chloride and chemically bonded on silk fabric. The chemical changes in the treated fabric were analyzed by X-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopy, and the dyeing and finishing performance of the treated fabric was assessed by measuring color strength, colorfastness, and antibacterial properties. In a salt-free process, the sericin-treated fabric yielded 91% dye utilization and a color strength of 12.9, significantly outperforming untreated silk in a conventional salt-assisted process, which reached only 55% dye utilization and a color strength of 7.8. After treatment with sericin, the dry and wet crease recovery angles increased significantly from 178° and 149° to 244° and 201°, respectively. Antibacterial analysis revealed that sericin-treated fabric exhibited a 99.99% bacterial inhibition rate and sustained antibacterial activity even after 10 Launder-Ometer washes. Promisingly, the reported study paves the path for eco-friendly, scalable reactive dyeing and antibacterial finishing of silk fabric without compromising mechanical strength by utilizing silk degumming waste.</p> Graphical abstract <p></p>

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Covalently grafting cationized sericin to silk fabric for achieving economical salt-free dyeing and antibacterial property and minimizing strength loss

  • 期刊论文

  • 发表日期：

    2025年1月4日

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  • Muhammad Asad Saleem,
  • Zihao Jin,
  • Mingbo Ma

摘要

In conventional dyeing of silk fabric with reactive dyes, a large amount of salt is utilized and remains in dyeing effluent. Here, we propose an eco-friendly salt-free dyeing of silk fabric with a reactive dye without deteriorating its tensile properties. Initially, low molecular weight sericin was modified with 2,3-epoxypropyltrimethylammonium chloride and chemically bonded on silk fabric. The chemical changes in the treated fabric were analyzed by X-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopy, and the dyeing and finishing performance of the treated fabric was assessed by measuring color strength, colorfastness, and antibacterial properties. In a salt-free process, the sericin-treated fabric yielded 91% dye utilization and a color strength of 12.9, significantly outperforming untreated silk in a conventional salt-assisted process, which reached only 55% dye utilization and a color strength of 7.8. After treatment with sericin, the dry and wet crease recovery angles increased significantly from 178° and 149° to 244° and 201°, respectively. Antibacterial analysis revealed that sericin-treated fabric exhibited a 99.99% bacterial inhibition rate and sustained antibacterial activity even after 10 Launder-Ometer washes. Promisingly, the reported study paves the path for eco-friendly, scalable reactive dyeing and antibacterial finishing of silk fabric without compromising mechanical strength by utilizing silk degumming waste.

Graphical abstract