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聚羧酸减水剂结构参数对分散性和吸附性的影响
作者：朱少宏
（科之杰新材料集团有限公司，福建 厦门 361100）
摘要：从分子设计角度，选择异丁烯聚氧乙烯基醚、丙烯酸和过硫酸铵等为原料，合成了一系列具有不同结构参数的聚羧酸减水剂，并通过水泥吸附量和净浆流动度测试，分析了不同结构参数对减水剂分散性和吸附性的影响，并进一步研究了聚羧酸减水剂在水泥颗粒表面吸附的变化规律。结果表明：在加热工艺下，合成的重均分子质量为55 128、大单体转化率为84.61%、侧链密度为0.1725的TPEG型PCE具有较好的吸附和分散性；在常温工艺下，合成的重均分子量为103 920、大单体转化率为93.09%、侧链密度为0.3124的HPEG型PCE具有较好的吸附和分散性。
关键词：聚羧酸减水剂；合成工艺；结构参数；分散性；吸附性
中图分类号：TU528.042+.2 文献标识码：A 文章编号：1001-702X（2022）02-0053-04
The influence of the structural parameters of polycarboxylate superplasticizer on the dispersion and adsorption
ZHU Shaohong
（KZJ New Materials Group Co. Ltd.，Xiamen 361100，China）
Abstract：Polycarboxylate superplasticizers with different structural parameters were synthesized by isobutylene polyoxyethylene ether，acrylic acid and ammonium persulfate as raw materials from the perspective of molecular design. The influence of polycarboxylate superplasticizer on dispersion and adsorption was characterized by cement adsorption capacity test and fluidity test，etc. At the same time，the adsorption change law of polycarboxylate superplasticizer on the surface of cement particles was also revealed. It was found that the best adsorption and dispersion properties on cement paste were obtained under the heating synthesis process when the structure of the water reducing agent was designed to have a weight average molecular weight of 55 128，a macromonomer conversion rate of 84.61%，and a side chain density of 0.1725. For products of normal temperature process，when the weight average molecular weight was 103 920，the macromonomer conversion rate 93.09%，and the side chain density 0.3124，the best adsorption and dispersion effect in cement can be reached.
Key words：polycarboxylate superplasticizer，synthesis process，structural parameters，dispersion performance，adsorption performance