Alkyl Chain Cross-Linked Sulfobutylated Lignosulfonate: A Highly Efficient Dispersant for Carbendazim Suspension Concentrate

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• 作者：Xueqing Qiu ; Weimei Zeng ; Wei Yu ; Yuyuan Xue ; Yuxia Pang ; Xiyi Li ; Yuan Li
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2015
• 出版时间：July 6, 2015
• 年：2015
• 卷：3
• 期：7
• 页码：1551-1557
• 全文大小：398K
• ISSN：2168-0485

文摘

A new family of highly water-soluble alkyl chain cross-linked sulfobutylated lignosulfonates (AASLSs) with a three-dimensional network structure and naked alkyl sulfonic acid groups were readily prepared by using 1,4-butane sultone (BS) and C₆H₁₂Br₂ by a one step reaction in water, which simultaneously improved the sulfonation degree and molecular weight. GPC, ¹H NMR, FTIR and functional group content tests confirmed their cross-linked chemical structure and efficient nucleophilic substitution reaction mechanism. Furthermore, the dispersion properties of AASLSs in a carbendazim suspension concentrate (SC) system were investigated. AASLS4 with high molecular weights (M_w) and moderate sulfonation degrees showed suspensibility of 99% in 45% carbendazim SC after hot storage at 50 掳C for 14 days. Meanwhile, AASLS4 also showed smaller SC particle size and better rheological performance than commercial lignosulfonate. The adsorption isotherms and 味-potential of AASLSs on carbendazim SC particles were studied to reveal the dispersion mechanism. The alkyl chain cross-linked structure and long alkyl chain-containing sulfonic acid groups contribute to the excellent dispersion properties on carbendazim SC. Our modification approach for lignin might provide a novel concept and prospective avenue for the design of efficient dispersants.