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

doi:10.16085/j.issn.1000-6613.2022-1552

Abstract

Abstract:

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.

Key words: lignite, oxidation, humic acid, superplasticizer, synthesis, dispersion, adsorption

摘要：

为了探索褐煤高值化利用途径，利用2-丙烯酰胺-2-甲基丙烷磺酸钠（AMPS）和丙烯酸（AA）分别对褐煤氧化解聚腐殖酸（OHA）和商品化腐殖酸（NHA）进行接枝共聚改性，制备了两种煤基腐殖酸（CHA）高效减水剂，考察了接枝共聚物结构及其单体配比对水泥砂浆和净浆流动度的影响，结合接枝共聚物结构表征对两种CHA高效减水剂的吸附性能及砂浆流动性、减水率、坍落度和机械强度等应用性能进行了评价，并与商品减水剂FDN-C进行了对比。结果显示，AMPS与AA接枝共聚改性可以显著提高CHA的水泥浆体流动性和减水率。其中，AA/AMPS=0.15时，接枝共聚物的改性效果最好；OHA接枝共聚改性效果优于NHA。OHA和NHA接枝共聚物的混凝土减水率分别达到24%和22%，28d抗压强度分别提升31.7%和40.0%，并且保坍能力明显高于FDN-C。CHA的芳香度高及含有丰富的酚羟基和羧基，有利于AMPS和AA接枝共聚反应，可以作为石油替代品用于制备水泥等材料的高效分散剂。

关键词: 褐煤, 氧化, 腐殖酸, 高效减水剂, 合成, 分散, 吸附

CLC Number:

TQ536

WANG Zhicai, LIU Weiwei, ZHOU Cong, PAN Chunxiu, YAN Honglei, LI Zhanku, YAN Jingchong, REN Shibiao, LEI Zhiping, SHUI Hengfu. Synthesis and performance of a superplasticizer based on coal-based humic acid[J]. Chemical Industry and Engineering Progress, 2023, 42(7): 3634-3642.

王知彩, 刘伟伟, 周璁, 潘春秀, 闫洪雷, 李占库, 颜井冲, 任世彪, 雷智平, 水恒福. 基于煤基腐殖酸的高效减水剂合成与性能表征[J]. 化工进展, 2023, 42(7): 3634-3642.

Figures/Tables 13

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原料	C	H	O^①	N	S	H/C	O/C
OHA	58.46	2.49	36.13	2.37	0.55	0.51	0.46
NHA	52.61	2.54	41.82	1.46	1.57	0.58	0.60

原料	C	H	O^①	N	S	H/C	O/C
OHA	58.46	2.49	36.13	2.37	0.55	0.51	0.46
NHA	52.61	2.54	41.82	1.46	1.57	0.58	0.60

样品	数均分子量（M_n） /g·mol^-1	重均分子量（M_w） /g·mol^-1	分散系数（PDI）
OHA	725	985	1.35
OgA	720	1430	1.99
AcA′	32507（1143）	105938（1518）	3.26（1.33）
OgAcA′	43350（1228）	95335（1528）	2.20（1.24）

样品	数均分子量（M_n） /g·mol^-1	重均分子量（M_w） /g·mol^-1	分散系数（PDI）
OHA	725	985	1.35
OgA	720	1430	1.99
AcA′	32507（1143）	105938（1518）	3.26（1.33）
OgAcA′	43350（1228）	95335（1528）	2.20（1.24）

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