摘要
以聚乙二醇单甲醚和甲基丙烯酸、丙烯酸,在催化剂、阻聚剂存在的情况下,采用熔融酯化法制备聚羧酸类减水剂中间大分子单体。用核磁共振图谱和红外光谱对产物进行了表征。研究了聚乙二醇单甲醚和甲基丙烯酸及丙烯酸的摩尔比、不同催化剂及阻聚剂用量对反应的影响。在最佳合成条件下,可得到酯化率达95%,双键剩余率为97%的大单体。
In the presence of catalyst and inhibitor, using melt transesterification method to produce intermediate macromonomer of polycarboxylate water reducing agent based on methoxypolyethylene glycols,methacrylic acid and acrylic acid. Nuclear Magnetic Resonance Spectroscopy （NMR） and Infrared Spectroscopy （IR） were applied to characterize the product. Factors influencing the reaction were studied. The factors contain Molar ratio of polyethylene glycol,methylacrylic acid and acrylic acid, different quantities of catalysts and inhibitors. Under the optimal synthetic condition,esterification rate can reach 95%,residual rate of double bond is 97%.
出处
《新型建筑材料》
2012年第1期49-52,共4页
New Building Materials
关键词
聚羧酸系减水剂
甲基丙烯酸
熔融酯化法
polycarboxylate water reducing agent
methacrylic acid
meh transesterification method
