聚膦酸减水剂的合成、表征及机理  

Synthesis and Mechanism of Polyphosphate Superplasticizer

作　　者：钱珊珊 姚燕 王子明[1] 崔素萍[1] 刘晓[1] 郑春扬[2] QIAN Shanshan;YAO Yan;WANG Ziming;CUI Suping;LIU Xiao;ZHENG Chunyang(Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China;Jiangsu China Railway ARIT New Materials Co.,Ltd,Jiangsu Province Engineering Research Center(ARIT)of concrete polymer additives,Nanjing 211505;China Building Materials Academy,The state key laboratory of green building materials,Beijing 100124,China)

机构地区：[1]北京工业大学,材料与制造学部,北京100124 [2]江苏奥莱特新材料股份有限公司,江苏省(奥莱特)混凝土高分子助剂工程技术研究中心,南京211505 [3]中国建筑材料科学研究总院,绿色建筑材料国家重点实验室,北京100124

出　　处：《硅酸盐学报》2021年第5期910-917,共8页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金项目(51578025);北京市属高校高水平教师队伍建设支持计划青年拔尖人才培育计划项目(CIT&TCD201804008);北京市教委科技计划面上项目(KM201510005003)。

摘　　要：以异丙烯膦酸(IPPA)和异戊烯醇聚氧乙烯-聚氧丙烯醚大单体(IPEPPG)为主要反应原料,在引发剂过硫酸铵(APS)和链转移剂次亚磷酸钠(SHP)作用下,进行自由基聚合反应,合成一种聚膦酸减水剂。对不同n(IPPA):n(IPEPPG)的摩尔比、APS用量、SHP用量和不同IPEPPG的质均分子量等进行正交优化,获得制备最佳性能的工艺条件和原材料配比。并对该减水剂进行凝胶色谱,红外光谱和核磁氢谱测试获得合成产物的分子量及分子量分布等结构参数信息,同时比较了该减水剂与普通减水剂在表面张力、流体力学半径、蒙脱土表面的吸附量、水泥水化放热速率、水泥净浆流变性能及新拌混凝土应用性能方面的差异。结果表明:该减水剂具有良好的降黏、抗泥和缓凝效果。Polyphosphate superplasticizer(PPS)was synthesized via free radical polymerization of isopropenyl-phosphonic acid(IPPA)and isopentenyl polyethylene-polypropylene glycol(IPEPPG)in the presence of ammonium persulphate(APS)as an intiator and sodium hypophosphite(SHP)as a chain transfer agent.The effects of n(IPPA):n(IPEPPG)molar ratio,APS amount,SHP amount and IPEPPG average molecular mass on the properties of polyphosphate superplasticizer were investigated to obtain the optimum parameters of technology and the appropriate proportion of raw materials.The molecular structure of polyphosphate superplasticizer was characterized by gel permeation chromatograph,Fourier transform infrared spectroscopy,and 1 H nuclear magnetic resonance,respectively.The surface tension,hydrodynamic radius,adsorption behavior on MMT,heat flow evolution over time during cement hydration,rheological behavior of cement pastes and application performance in concrete were determined.The results show that polyphosphate superplasticizer has viscosity-reducing effect,clay tolerance and retard cement hydration.

关 键 词：聚膦酸减水剂 降黏 抗泥 缓凝 混凝土 

分 类 号：TU528[建筑科学—建筑技术科学]