Preparation and properties of polycarboxylic superplasticizer with high tolerance to clay

doi:10.16085/j.issn.1000-6613.2016.09.038

Abstract

Abstract: In this paper, a polycarboxylate superplasticizer with anti-clay was prepared using methyl acrylic acid(MAA) and hydroxyethyl methacrylate(HEMA) as monomers, hydrogen peroxide (H₂O₂) and ascorbic acid(Vc) as initiators, and methyl propene sulfonate(SMAS) as the chain transfer agent. The copolymer was characterized by a Fourier transform infrared spectrometer(FTIR) and gel permeation chromatography(GPC). The dispersion properties and mechanism of tolerance to montmorillonite were explored by tests of fluidity, functional group of montmorillonite interlayer, X ray diffraction, and adsorption amount. The results show that the superplasticizer with anti-clay has better dispersing performance at n(MAA):n(HEMA)=2.5:1;the initial fluidity of cement paste can exceed 268mm when the dosage of superplasticizer is 0.25% of cement mass. The superplasticizer with anti-clay shows low sensitivity to montmorillonite compared to common superplasticizers. The interlayer spacing of montmorillonite modified with newly-synthesized superplasticizers is 1.40nm; the adsorption amount on montmorillonite particles is far less than those of conventional superplasticizers.

Key words: polycarboxylate superplasticizer, anti-clay, montmorillonite, dispersion property

摘要： 以甲基丙烯酸（MAA）、甲基丙烯酸羟乙酯（HEMA）为单体，过氧化氢（H₂O₂）/抗坏血酸（Vc）为引发剂，甲基烯丙基磺酸钠（SMAS）为链转移剂，合成了一种抗泥型聚羧酸减水剂，通过红外光谱（FTIR）、凝胶渗透色谱（GPC）对聚合物进行结构表征，通过水泥净浆流动度、蒙脱土层间官能团、X射线衍射和吸附量测试，对其分散性能及抑制蒙脱土机理进行了探究。结果显示：合成的抗泥型聚羧酸减水剂在摩尔比为2.5：1时分散性能最佳，当减水剂折固掺量为0.25%时，水泥初始净浆流动度为268mm；与普通聚羧酸减水剂相比，合成的抗泥型减水剂对蒙脱土敏感性较低，与蒙脱土作用后的层间未出现抗泥型减水剂的特征官能团，层间距为1.40nm，抗泥型减水剂在蒙脱土上的吸附量远小于普通减水剂的吸附量。

关键词: 聚羧酸减水剂, 抗泥型, 蒙脱土, 分散性能

CLC Number:

TU528.042

ZHU Hongjiao, ZHANG Guanghua, HE Zhiqin, WANG Ziru. Preparation and properties of polycarboxylic superplasticizer with high tolerance to clay[J]. Chemical Industry and Engineering Progree, 2016, 35(09): 2920-2925.

朱红姣, 张光华, 何志琴, 王子儒. 抗泥型聚羧酸减水剂的制备及性能[J]. 化工进展, 2016, 35(09): 2920-2925.

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