新型酯类聚羧酸减水剂的合成及研究

关键字：聚羧酸减水剂,甲氧基聚乙二醇单甲醚,酯化,分散

（1.同济大学先进土木工程材料教育部重点实验室，上海  201804；2.浙江建研科之杰新材料有限公司，浙江 嘉兴　314108）

 
    摘要：根据分子结构设计原理，用丙烯酸单体（AA）直接聚合得到分子质量适中的聚合物PAA，然后与甲氧基聚乙二醇单甲醚（MPEG）进行酯化接枝反应，合成了一种适应性优良、具有良好分散性和分散保持性的新型酯类聚羧酸减水剂（PCE-2）。分析了合成过程中引发剂用量、链转移剂用量、MPEG分子质量、催化剂用量、酸醚比等对PCE-2分散性能的影响。通过红外光谱、凝胶色谱和化学滴定等对接枝共聚物进行分析表征。
    关键词：聚羧酸减水剂；甲氧基聚乙二醇单甲醚；酯化；分散性
    中图分类号：TU528.042.2        文献标识码：A        文章编号：1001-702X（2017）02-0034-05

Synthesis and research of novel esterifiable polycarboxylate superplasticizer
YU Feiyu1，2，SUN Zhenping1，ZENG Xianhua2，ZHU Qiaoyong2，HUANG Wenyao2
（1.Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education of Tongji University，Shanghai 201804，China；2.Zhejiang KZJ New Materials Co. Ltd.，Jiaxing 314108，China）

    Abstract：According to the principle of molecular structure design，this paper chose the acrylic monomer（AA） to directly synthesize polymer PAA with suitable molecular weight. Then an esterification grafting reaction between PAA and methoxy polyethylene glycol monomethyl ether（MPEG）　was occurred to form a novel esterifiable polycarboxylate superplasticizer（PCE-2）with good adaptability，great disperse performance and dispersion retaining ability. We analyzed the effect of the dosage of initiators，chain transfer agents，molecular weight of MPEG，the dosage of catalyst，the ratio of acid and ether on the disperse performance of PCE-2. We analyzed and characterized the graft copolymer by infrared spectroscopy，gel chromatography and chemical titration.
    Key words：polycarboxylate superplasticizer，MPEG，esterification，disperse performance