Sulfonation of Alkali Lignin and Its Potential Use in Dispersant for Cement
Sulfonation of Alkali Lignin and Its Potential Use in Dispersant for Cement
复制标题
碱木质素的磺化及其在水泥分散剂中的潜在应用
DOI：
10.1080/01932690802473560
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发表时间：
2009-01-01
影响因子：
2.2
通讯作者：
Pang, Yuxia
中科院分区：
文献类型：
--
作者：
Ouyang, Xinping;Ke, Lixuan;Pang, Yuxia
采用常压中温磺化法对麦草制浆废液中的碱木质素进行了磺化改性，并对磺化木质素的性能进行了表征。结果表明，缩合木质素通过氧化反应降解为分子量较低的木质素片段，产生更多的与甲醛反应的活性中心，从而形成更多的磺化活性羟甲基。因此，在常压中温条件下进行碱木质素磺化反应是可行的。随着磺酸基含量的增加，磺化度为1.49 mmol/g的磺化木质素在中性水溶液中的溶解度可达96.9%，并具有良好的表面活性。与商品木质素磺酸盐相比，磺化木质素对水泥颗粒的吸附量和zeta电位更高，对水泥基体的分散效果更好。
Sulfonation modification of alkali lignin from wheat straw pulping spent liquid, carried out under normal pressure and medium temperature, was investigated, and the properties of the resulting sulfonated lignin were characterized. It was found that condensed lignin was degraded into lignin fragments with lower molecular weight by oxidation reaction, producing more active sites to react with formaldehyde, consequently forming more active hydroxymethyl groups for sulfonation. Therefore, it is feasible to carry out the sulfonation of alkali lignin under conditions of normal pressure and medium temperature. As higher contents of sulfonic group were introduced, sulfonated lignin with 1.49 mmol/g of sulfonation degree exhibits 96.9% of solubility at neutral aqueous solution and good surface activity. Compared to commercial lignosulfonate, sulfonated lignin produced by the present work contributes higher adsorption amount and zeta potential to cement particles, and hence shows better dispersion effect to the cement matrix.