室温聚羧酸减水剂制备及与蒙脱土作用机理  

Synthesis of polycarboxylate superplasticizer at room temperature and mechanism research of Montmorillonite with superplasticizer

作　　者：张光华[1] 何志琴[1] 王睿[1] 秦松[1] 

机构地区：[1]陕西科技大学教育部轻化工助剂化学与技术重点实验室,陕西西安710021

出　　处：《陕西科技大学学报（自然科学版）》2016年第3期82-86,共5页Journal of Shaanxi University of Science & Technology

基　　金：陕西省教育厅重点实验室科研计划项目(2011JS020)

摘　　要：以异丁烯醇聚氧乙烯醚、丙烯酸、甲基烯丙基磺酸钠为单体,以芬顿试剂为引发体系在室温下合成了聚羧酸减水剂,利用红外光谱和凝胶渗透色谱仪对聚合物进行了结构表征,通过水泥净浆流动度、坍落度、X射线衍射(XRD)、比表面积吸附量等测试,对其分散性能及与蒙脱土作用机理进行了探究.结果显示:室温下合成的聚羧酸减水剂具有较高的减水率和良好的分散保持性.蒙脱土掺量超过0.3wt%时,30min后水泥浆料彻底失去流动性.蒙脱土对减水剂分散性能影响的主要原因是:蒙脱土具有层状结构,易与减水剂插层吸附;而且蒙脱土比表面积较大,吸附活性点多,吸附量远远大于水泥颗粒.Isobutene polyoxyethylene ether（HPEG）,acrylic acid（AA）,methyl propene sulfon-ate（SMAS）as raw material,prepared polycarboxylate superplasticizers initiated by fenton reagent at room temperature.The copolymer was analyzed by fourier transform infrared spectrometer （FTIR）and gel permeation chromatography（GPC）.Reaction mechanism be-tween Montmorillonite （MMT）and superplasticizer was investigated respectively by the tests of fluidity,slump,X-ray diffraction （XRD）,adsorption amount,specific surface area. The results shown that：the superplasticizers synthesized at room temperature had higher wa-ter reduced rate and good dispersibility.When the addition of Montmorillonite was more than 0.3%,the slurry lose fluidity completely after 30 min.The main reasons of effect of Mont-morillonite on dispersibility were that Montmorillonite had layered structure which easily caused intercalation adsorption by superplasticizers,besides Montmorillonite had larger spe-cific surface area,as a result,adsorption amount was far greater than the cement particles.

关 键 词：聚羧酸 室温 蒙脱土 吸附 

分 类 号：TU528.042[建筑科学—建筑技术科学]