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<p>In this study, alkali lignin (AL) was used as the raw material to prepare sulfomethylated lignin (SAL). Phenyl and imidazole groups were introduced into SAL molecules to synthesize modified lignin dispersants for nano-disperse dye pastes. Results showed that SAL exhibited poor grinding performance and thermal stability in nano-pastes. In contrast, the comprehensive properties of histidine-modified SAL (His-SAL) and phenylalanine-modified SAL (Phe-SAL) were significantly improved. Among them, His-SAL demonstrated optimal performance. Studies on dispersants’ adsorption behavior in nano-paste systems indicated that SAL formed weak monolayer adsorption through hydrophobic van der Waals forces and hydrogen bonding. The absence of strong adsorption groups led to desorption due to increased Brownian motion during thermal storage, thereby reducing system stability. The phenyl groups in Phe-SAL enhanced hydrophobic van der Waals forces and π-π stacking interactions between the dispersant and dyes, increasing the adsorption capacity (|ΔF|). However, multilayer adsorption used up excess dispersant, leaving less free dispersant and weakening control over the size of newly formed nano dye particles. His-SAL established monolayer ligand adsorption through electron-transfer complexation between imidazole groups and dyes. The sufficient free dispersant enables the dispersion system to continuously encapsulate new nanoparticles, effectively preventing particle agglomeration caused by Ostwald ripening and resulting in the best thermal stability in the dispersion.</p>

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Investigation on the Performance and Mechanism of Modified Lignosulfonate in Nano-Disperse Dye Paste

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • Xuexian Wang,
  • Gengbin Wang,
  • Yong Qian,
  • Yuxia Pang,
  • Mingsong Zhou

摘要

In this study, alkali lignin (AL) was used as the raw material to prepare sulfomethylated lignin (SAL). Phenyl and imidazole groups were introduced into SAL molecules to synthesize modified lignin dispersants for nano-disperse dye pastes. Results showed that SAL exhibited poor grinding performance and thermal stability in nano-pastes. In contrast, the comprehensive properties of histidine-modified SAL (His-SAL) and phenylalanine-modified SAL (Phe-SAL) were significantly improved. Among them, His-SAL demonstrated optimal performance. Studies on dispersants’ adsorption behavior in nano-paste systems indicated that SAL formed weak monolayer adsorption through hydrophobic van der Waals forces and hydrogen bonding. The absence of strong adsorption groups led to desorption due to increased Brownian motion during thermal storage, thereby reducing system stability. The phenyl groups in Phe-SAL enhanced hydrophobic van der Waals forces and π-π stacking interactions between the dispersant and dyes, increasing the adsorption capacity (|ΔF|). However, multilayer adsorption used up excess dispersant, leaving less free dispersant and weakening control over the size of newly formed nano dye particles. His-SAL established monolayer ligand adsorption through electron-transfer complexation between imidazole groups and dyes. The sufficient free dispersant enables the dispersion system to continuously encapsulate new nanoparticles, effectively preventing particle agglomeration caused by Ostwald ripening and resulting in the best thermal stability in the dispersion.