Preparation of Low Clay Sensitive Polycarboxylate Superplasticizer
LI Yue1, ZHAO Bingyin1, HUANG Zhou2, WU Yusheng2, JIN Caiyun3, CAI Boqun1
1 The Key Laboratory of Urban Security and Disaster Engineering, MOE, Beijing University of Technology, Beijing 100124, China 2 China Building Materials Inspection and Certification Group Xiamen Hongye Company, Xiamen 361026, China 3 College of Applied Sciences of Beijing University of Technology, Beijing 100124, China
Abstract: The unmodified polycarboxylate superplasticizer prepared by free radical copolymerization methyl allyl polyoxyethylene ether (HPEG) and acrylic acid (AA) were used as reaction monomers, ammonium persulfate (APS) as oxidant and compound C as reductant. The optimum synthetic conditions of polycarboxylate superplasticizer were determined by orthogonal design, then sodium methacrylic sulfonate (MAS), phosphoric acid functional monomer (PFM), 2-acrylamide-2-methylpropionic sulfonic acid (AMPS) and β-cyclodextrin maleic acid monoester (β-CD-MAH) used as functional monomer materials and polycarboxylate superplasticizer with different functional groups were prepared with the above raw materials. The dispersion and retention of modified superplasticizer were tested by using cement paste with and without clay, then the sensitivity of different superplasticizer to clay was obtained. The experimental results show that compared with the polycarboxylate superplasticizer wit-hout functional monomer modification, except the sensitivity of AMPS modified polycarboxylate superplasticizer to clay, the sensitivity of the other three polycarboxylate superplasticizer to clay decreases. Among them, the sensitivity of the polycarboxylate superplasticizer modified by β-cyclodextrin to clay decreases significantly. Infrared spectroscopy is used to detect β-CD-MAH and polycarboxylate superplasticizer modified by β-cyclodextrin was characterized.
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2020, Vol. 34 
