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降黏型聚羧酸减水剂的合成与性能研究
作者：陈林峰
（福建科之杰新材料有限公司，福建 厦门 361004）
摘要：采用不饱和聚醚大单体与丙烯酸、引发剂等在水溶液体系中进行自由基共聚，同时在分子主链引入含憎水基团的醋酸乙烯酯、甲基丙烯酰氧乙基马来酸单酯，合成了降黏型聚羧酸减水剂PC-1。红外光谱和凝胶渗透色谱分析表明，PC-1具有预期的化学结构；采用涂-4黏度杯和旋转黏度计测试水泥净浆的黏度，结果表明，PC-1具有优异的降黏效果，同时兼具较好的初始分散性和保坍性。C50混凝土应用试验表明，掺PC-1的初始和2 h混凝土倒坍筒排空时间均明显优于国内同类产品PC-2，与国外同类产品PC-3相当。
关键词：降黏型；涂-4黏度；旋转黏度；倒坍筒排空时间
中图分类号：TU528.042+.2 文献标识码：A 文章编号：1001-702X（2019）02-0065-03
Study on the synthesis and properties of viscosity-reducing type polycarboxylate superplasticizer
CHEN Linfeng
（Fujian KZJ New Materials Co. Ltd.，Xiamen 361004，China）
Abstract：The viscosity-reducing type polycarboxylate superplasticizer PC-1 are prepared by free radical copolymerization of an unsaturated polyether macromonomer with acrylic acid and initiator in an aqueous solution system，and introduction of a vinyl halide-containing vinyl acetate, methacryloyloxyethyl maleic acid monoester in the molecular main chain. The synthetic polymers are characterized by IR and GPC. It shows that the sample of the PC-1 has the expected chemical structure. The viscosity of the paste were tested by coating-4 viscosity cups and rotary viscometer. The results showed that PC-1 had excellent viscosity-reducing effect and good initial-dispersion and slump retention. The results of C50 concrete test show that collapsed down of slump cone vibration empty time of PC-1 in initial and 2h are obviously better than those of the same kind PC-2 at home，and it is equivalent to the aboard products of the same kind PC-3.
Key words：viscosity-reducing type，coating-4 viscosity，rotary viscometer，collapsed down of slump cone vibration empty time