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Polymers 2018, 10(9), 982; https://doi.org/10.3390/polym10090982

Preparation of a Low Reducing Effect Sulfonated Alkali Lignin and Application as Dye Dispersant

1,2,†
,
1,3,†
,
1
,
1
,
2,3,4
,
2,3,4
,
1,* and 1,*
1
School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China
2
Guangdong Provincial Key Lab of Green Chemical Product Technology, Guangzhou 510000, China
3
School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510000, China
4
State Key Lab of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Received: 11 July 2018 / Revised: 30 August 2018 / Accepted: 31 August 2018 / Published: 3 September 2018
(This article belongs to the Special Issue Lignin Polymers: Structures, Reactions and Applications)
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Abstract

A novel grafting hydroxypropyl sulfonated and blocking condensed lignin (GSBAL) dye dispersant was prepared based on alkali lignin (AL) by sulfonation and etherification reactions. The significant increase in the sulfonic group content and the molecular weight endow GSBAL with excellent dispersity and stability at high temperatures. More importantly, the unfavorable property of the reducing effect of AL was largely reduced since over 80% of the phenolic hydroxyl groups were blocked. The functional azo groups in the dye could be mostly retained. The reducing rate of dye with GSBAL was decreased to 6.54% (25 °C), much lower than 18.62% for sulfomethylated alkali lignin (SAL) and 15.73% for sodium lignosulfonate (NaLS). The dispersity and exhaustion of the dye bath with GSBAL dispersant was significantly improved compared with that of a dye bath with SAL and NaLS. View Full-Text
Keywords: alkali lignin; hydroxypropyl sulfonation; blocking condensed; reducing effect; dye exhaustion alkali lignin; hydroxypropyl sulfonation; blocking condensed; reducing effect; dye exhaustion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Qin, Y.; Lin, X.; Lu, Y.; Wu, S.; Yang, D.; Qiu, X.; Fang, Y.; Wang, T. Preparation of a Low Reducing Effect Sulfonated Alkali Lignin and Application as Dye Dispersant. Polymers 2018, 10, 982.

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