降粘型聚羧酸减水剂的研究及制备

关键字：降粘型,聚羧酸,减水剂,研究,制备

（科之杰新材料集团有限公司，福建　厦门  361100）

    摘要：以异戊烯醇聚氧乙烯醚（TPEG）、丙烯酸（AA）、丙烯酰胺（AM）、二甲基丙烯酸乙二醇酯为主要原料，共聚合成降粘型聚羧酸减水剂PC-2。研究不同侧链长度、丙烯酰胺和二甲基丙烯酸乙二醇酯用量对PC-2性能的影响。结果表明，该减水剂的最佳制备工艺为n（AA）∶n（TPEG-1000）=3.5∶1.0，新型还原剂、丙烯酰胺、二甲基丙烯酸乙二醇酯和3-巯基丙酸用量分别为单体总质量的0.15%、1.5%、2.5%和0.5%，n（H2O2）∶n（新型还原剂）=4∶1。经测试验证，PC-2的坍落度保持性和降粘效果都明显优于市售降粘型聚羧酸PC-1。
    关键词：聚羧酸减水剂；净浆流动度；降粘型
    中图分类号：TU528.042.2        文献标识码：A        文章编号：1001-702X（2017）09-0064-03

Study and preparation on viscosity poly carboxylic acid water reducing agent
ZHANG  Xiaofang
（Fujian Prominent Science New Materials Co.　Ltd.，Xiamen 361100，China）

    Abstract：Viscosity poly carboxylic acid water reducing agent（PC-2）　was synthesized by monomers including TPEG，AA，AM and Ethylene glycol dimethacrylate. The effects of the different side chain length，the dosage of AM and Ethylene glycol dimethacrylate on PC-2 performance were discussed. The experimental result showed that the water reducing agent had a optimized preparation condition at n（AA）∶n（TPEG-1000）=3.5∶1.0，the dosage of new reductant，AM，Ethylene glycol dimethacrylate and 3-mercaptopropanoic acid was 0.15%，1.5%，2.5% and 0.5% of total mass respectively，n（H2O2）∶n（new reductant）=4∶1. The slump retention and the effect of viscosity reduction were all better than regular polycarboxylate PC-1 by cases testing.  
    Key words：polycarboxylate superplasticizer，cement paste fluidity，viscosity reduction