引用本文:吴凤龙, 宋瑾.抗泥型酯醚复配聚羧酸系减水剂的制备及与膨润土作用机理研究[J].西南师范大学学报(自然科学版),2019,44(12):70~76
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抗泥型酯醚复配聚羧酸系减水剂的制备及与膨润土作用机理研究
吴凤龙, 宋瑾1,2,3
1. 河套学院 生态与资源工程系, 内蒙古 巴彦淖尔市 015000;2. 河套学院 农学系, 内蒙古 巴彦淖尔市 015000;3. 内蒙古大学 化学化工学院, 呼和浩特市 010000
摘要:
将自制抗泥型聚酯类(PC1)和聚醚类(PC2)聚羧酸系减水剂复配,系统研究了不同复配比对减水剂分散性能的影响.通过FTIR,XRD,SEM,XPS和TG-DTG分析了减水剂分子结构和抗泥机理.结果表明:减水剂链段中含有酯基、羧基、酰胺基、磺酸基、羟基等官能团.当酯醚复配比例为2∶3时,水泥初始净浆流动度为281 mm,30 min和60 min的经时损失率为2.85%和6.05%.该复配减水剂延缓了水泥7 d水化过程.膨润土对其吸附以表面吸附为主,吸附层厚度6.24 nm;以插层吸附为辅,层间距由1.248 0 nm变为1.800 1 nm,增大了0.552 1 nm.
关键词:  聚羧酸系减水剂  制备  抗泥机理  膨润土
DOI:10.13718/j.cnki.xsxb.2019.12.012
分类号:TU528.042.2
基金项目:内蒙古自治区自然科学基金(2018MS05015);内蒙古自治区高等学校科学研究项目(NJZY16337).
On Synthesis of Polyester-Type and Polyether-Type Composite Superplasticizer with Clay Tolerance and Action Mechanism of Bentonite
WU Feng-long, SONG Jin1,2,3
1. Department of Ecology and Resource Engineering, Hetao College, Bayannur, Inner Mongolia 015000, China;2. Department of Agriculture, Hetao College, Bayannur, Inner Mongolia 015000, China;3. College of Chemistry and Chemical Engineer, Inner Mongolia University, Hohhot 010000, China
Abstract:
The compound cement water reducing agent with anti-clay was synthesized with home-made polyester type (PC1) and polyether type (PC2) as raw material. The influence of mix ratio of PC1 and PC2 on the dispersing performance was systematically researched. The molecular structure and antifouling mechanism of water-reducing agent were analyzed by FTIR, XRD, SEM, XPS and TG-DTG. The test results show that the water reducing agent chain segment containing ester base, carboxyl group, amide group, amino sulfonic acid, hydroxyl base and other functional groups. When the mix ratio of PC1 to PC2 is 2:3, the initial cement slurry fluidity is 281mm; the fluidity loss rates for 30 min and 60 min are 2.85% and 6.05%. The compound water reducing agent can delay the cement hydration within 7 d. Besides, the adsorption of bentonite is dominated by surface, and the thickness of the adsorption layer is 6.24 nm. The inter-stratum adsorption is assistant, and the layer spacing changes from 1.248 0 nm to 1.800 1 nm, increasing 0.552 1 nm.
Key words:  polycarboxylate water-reducer  synthesis  antifouling mechanism  bentonite
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