Synthesis and performance of a superplasticizer based on coal-based humic acid

被引：0
|
作者：
Wang Z. [1 ]
Liu W. [1 ]
Zhou C. [1 ]
Pan C. [1 ]
Yan H. [1 ]
Li Z. [1 ]
Yan J. [1 ]
Ren S. [1 ]
Lei Z. [1 ]
Shui H. [1 ]
机构：
[1] Anhui Key Laboratory of Clean Coal Conversion and High-value Utilization, School of Chemistry and Chemical Engineering, Anhui University of Technology, Ma′anshan, Anhui
来源：
Huagong Jinzhan/Chemical Industry and Engineering Progress | 2023年 / 42卷 / 07期
关键词：
adsorption; dispersion; humic acid; lignite; oxidation; superplasticizer; synthesis;
D O I：
10.16085/j.issn.1000-6613.2022-1552
中图分类号：
学科分类号：
摘要：
In order to develop the pathway of high value utilization of lignite, two coal-based humic acid (CHA) superplasticizers were prepared by grafting copolymerization of oxidative depolymerized humic acid of lignite (OHA) and commercial humic acid (NHA) with 2-acrylamide-2-methylpropane sulfonate (AMPS) and acrylic acid (AA), respectively. The effects of the structure and monomer ratio of graft copolymers on the fluidity of cement mortar and slurry were investigated. Combined with the structure characterization, the adsorption performance and the application properties of two synthesized CHA superplasticizers such as mortar fluidity, water-reducing rate, slump and mechanical strength were evaluated, and were further compared with commercial superplasticizer FDN-C. The results showed that the graft copolymerization by AMPS and AA on CHA can significantly improve the fluidity and water-reducing rate of cement paste. With 0.15 of AA/AMPS monomer mole ratio, the best modification effect of graft copolymer was obtained. The modification of OHA graft copolymer was better than that of NHA. The concrete water-reducing rates of OHA and NHA graft copolymers reached 24% and 22%, and their 28-day compressive strength were increased by 31.7% and 40.0%, respectively. Besides, the slump retention ability of OHA and NHA copolymers were significantly higher than that of commercial water-reducer FDN-C. CHA with high aromaticity and abundant oxygen-containing functional groups such as phenolic hydroxyl group and carboxyl group was beneficial to the graft copolymerization of AMPS and AA, and can be used as a substitute for petroleum to prepare the efficient dispersant. © 2023 Chemical Industry Press. All rights reserved.
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页码：3634 / 3642
页数：8
相关论文
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