减水剂中磺酸基和羧基吸附特点及其影响因素探讨  

Study on the absorption of carboxyl and sulfonic groups of superplasticizer

作　　者：段建平[1] 吕生华[1] 高瑞军[1] 李第[1] 曹强[1] 

机构地区：[1]陕西科技大学资源与环境学院,陕西西安710021

出　　处：《混凝土》2012年第1期84-87,共4页Concrete

基　　金：国家自然科学基金项目(21076121)

摘　　要：用紫外分光光度计测定了不同离子环境下含羧基的甲基丙烯酸(MA)和含磺酸基的甲基丙烯磺酸钠(MASA)在水泥模拟物CaCO3上的吸附特点,从而判断减水剂中羧基和磺酸根的吸附特点和区别。研究发现,溶液环境中不同离子对两者的吸附造成的影响不同,磺酸根吸附量大于羧基;硫酸根对羧基吸附量降低大于磺酸基;增加pH能增加羧基的吸附量,但对磺酸基影响很小。研究为聚羧酸减水剂和萘系减水剂在对水泥的适应性和流动经时变化的差别提供了一定的理论依据。The absorption character of carboxyl and sulfonic groups was studied based on the calcium carbonate,model of cement,via the UV spectrophotometer.The results indicated that the influence was different according to the types of ions in the bulk of solution because of the intrinsic properties of carboxyl and sulfonic groups.The absorption amount of sulfonic groups was larger than carboxyl groups,the increase of pH could result in the increase of absorption of carboxyl but seldom increase in absorption was observed for sulfonic group.This study provided a theoretic basement of the difference in capability and fluidity over different time for polycarboxylate superplasticizer and naphthalene sulfonated formaldehyde condensates.

关 键 词：减水剂 羧基 磺酸基 紫外分光光度计 吸附 

分 类 号：TU528.01[建筑科学—建筑技术科学]