缩聚型聚羧酸减水剂的合成及性能研究  

Performance Evaluation of Polycarboxylate Superplasticizer Synthesized through Condensation Polymerization

作　　者：李申桐 刘金芝 杨勇 冉千平 

机构地区：[1]高性能土木工程材料国家重点实验室江苏苏博特新材料股份有限公司,江苏南京211103

出　　处：《广州化工》2017年第18期21-23,59,共4页GuangZhou Chemical Industry

基　　金：国家自然科学基金项目(No51408272&51408273);江苏省自然科学基金(BK20160105)

摘　　要：通过硫酸催化下的邻羟基苯甲酸、苯酚聚氧乙烯醚和甲醛之间的缩聚反应,合成了一种新型聚羧酸减水剂。在不同反应时间下使用GPC对聚合物转化率和分子量进行测试,得到了反应的动力学曲线。此外,研究了酸醚比、温度、甲醛用量和硫酸用量对聚羧酸性能的影响。最佳合成条件为:酸醚比4,温度115℃,甲醛105%,硫酸40%。合成的聚羧酸有较高的减水率,能提高混凝土的抗压强度。A novel polycarboxylate superplasticizer based on condensation polymerization of 2-hydroxybenzoic acid,phenol poly（ethylene glycol） ether and formaldehyde catalyzed by sulfuric acid was synthesized. The polymer conversionand molecular weight at different time were measured by GPC, a kineticdiagramwas plotted. The influence of acid/etherratio, reaction temperature, the amount of formaldehyde and sulphuric acid on the performance of the synthesized polymerswas studied. The optimal condition was found as follows： acid/ether ratio of 4, reaction temperature of 115 ℃, 105% offormaldehyde and 40% of sulphuric acid. The resultant polymer has a high water-reducing rate, can improve compressionstrength of concrete.

关 键 词：聚羧酸 减水剂 羟基苯甲酸 缩聚反应 

分 类 号：O632.51[理学—高分子化学]