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<p>In order to solve the pollution of Cr<sup>3+</sup> and toxic dyes cause by traditional tanning technology, this study developed chromium-free tanning agents (COS-Dyes-Al) that incorporate high-performance dyeing functions by using oligo-chitosan (COS) as a matrix and chemically modifying it with three types of dyes, reactive Blue R19, tartrazine, and eosin B, and then coordination with Al (III). COS-Dyes-Al exhibit excellent tanning properties, raising the shrinkage temperature of leather to 98.6 °C, with tensile and tear strengths reaching 17.4 MPa and 70.1 N/mm, respectively, along with superior durability against rubbing and washing. Moreover, COS-Dyes-Al reduced the environmental burden by effectively integrate tanning and regulable color dyeing functionality into the leather. The COS-Dyes-Al tanning system can save 60–80% of water, 30% of electric energy, and 50–70% of thermal energy. Therefore, the tanning system helps to reduce the carbon footprint in leather production.</p>

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Chitosan based chromium free tanning system for reducing the carbon footprint to leather production process

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月25日

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  • Shuang Liang,
  • Xuechuan Wang,
  • Chao Wei,
  • Long Xie,
  • Xugang Dang

摘要

In order to solve the pollution of Cr3+ and toxic dyes cause by traditional tanning technology, this study developed chromium-free tanning agents (COS-Dyes-Al) that incorporate high-performance dyeing functions by using oligo-chitosan (COS) as a matrix and chemically modifying it with three types of dyes, reactive Blue R19, tartrazine, and eosin B, and then coordination with Al (III). COS-Dyes-Al exhibit excellent tanning properties, raising the shrinkage temperature of leather to 98.6 °C, with tensile and tear strengths reaching 17.4 MPa and 70.1 N/mm, respectively, along with superior durability against rubbing and washing. Moreover, COS-Dyes-Al reduced the environmental burden by effectively integrate tanning and regulable color dyeing functionality into the leather. The COS-Dyes-Al tanning system can save 60–80% of water, 30% of electric energy, and 50–70% of thermal energy. Therefore, the tanning system helps to reduce the carbon footprint in leather production.