Preparation of Lignosulfonates from Biorefinery Lignins by Sulfomethylation and Their Application as a Water Reducer for Concrete

被引:81
作者
Huang, Caoxing [1 ,2 ]
Ma, Junmei [1 ]
Zhang, Weiyu [1 ]
Huang, Guohong [1 ,3 ]
Yong, Qiang [1 ]
机构
[1] Nanjing Forestry Univ, Coll Chem Engn, Coinnovat Ctr Efficient Proc & Utilizat Forest Pr, Nanjing 210037, Jiangsu, Peoples R China
[2] South China Univ Technol, State Key Lab Pulp & Paper Engn, Guangzhou 510640, Guangdong, Peoples R China
[3] Nanjing Hydraul Res Inst, Dept Mat & Struct Engn, Nanjing 210037, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
biorefinery lignin; sulfomethylation; lignosulfonate; water reducer; concrete; ENZYMATIC-HYDROLYSIS; BAMBOO RESIDUES; KRAFT LIGNIN; DISPERSANT; SACCHARIFICATION; PRETREATMENT; STRATEGIES; OXIDATION;
D O I
10.3390/polym10080841
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Lignosulfonate (LG), a water-soluble polymer from sulfite pulping process of lignocellulosic biomass, has been commercially applied as admixture for concrete. In this work, lignosulfonates were produced from alkaline lignin (AL) and enzymatic hydrolysis residue (EHR) by sulfomethylation and these lignosulfonates as water reducers for concrete were then evaluated. Results showed that 94.9% and 68.9% of lignins in AL and EHR could be sulfonated under optimum sulfomethylation conditions, respectively. The sulfonic groups in lignosulfonates from AL (AL-LG) and EHR (EHR-LG) were 1.6 mmol/g and 1.0 mmol/g, respectively. Surface tension and zeta potential analysis indicated that both AL-LG and EHR-LG can be potentially used to as dispersant for improving the fluidity of the cement paste, similarly to commercial lignosulfonate (CM-LG). Adding 0.2 wt % of AL-LG, EHR-LG, and CM-LG in the concrete, the compressive strength (28 days) of concretes increased from 38.4 Mpa to 41.6, 42.6, and 40.9 Mpa, respectively. These findings suggest that the lignosulfonate from biorefinery lignin by sulfomethylation can meet the industrial standards as water reducers for cement admixtures.
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页数:12
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