Multi-site sulfonation of lignin for the synthesis of a high-performance dye dispersant

分散剂 木质素 染色 化学 化学工程 有机化学 材料科学 色散(光学) 工程类 光学 物理
作者
Qian Zheng,Shasha Yan,Xiaohong Chen,Ziyang Chang,Huifang Zhao,Daliang Guo,Lizheng Sha,Run‐Cang Sun
出处
期刊:International Journal of Biological Macromolecules [Elsevier BV]
卷期号:269: 132145-132145
标识
DOI:10.1016/j.ijbiomac.2024.132145
摘要

Sulfonated lignin-based dye dispersants have intensively attracted attention due to their low cost, renewability and abundant sources. However, their utilization is limited by the low content of sulfonic groups and high content of hydroxyl groups in their complex lignin structure, which results in various problems such as high reducing rate of dye, severe staining of the fibers and uneven dyeing. Here, the multi-site sulfonated lignin-based dispersants were prepared with high sulfonic group content (2.20 mmol/g) and low hydroxyl content (2.43 mmol/g). When using it as the dispersant, the dye uptake rate was improved from 69.23 % to 98.55 %, the reducing rate was decreased from 20.82 % to 2.03 %, the K/S value was reduced from 0.69 to 0.02, and the particle sizes in dye system before and after high temperature treatment were stabilized below 0.5 μm. Besides, the dispersion effect was significantly improved because no obvious separation between dye and water was observed even if without the assistance of grinding process. In short, the multi-site sulfonation method proposed in this work could remarkably improve the performances of the lignin-based dye dispersants, which would facilitate the development of the dye dispersion and the high value utilization of lignin.
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