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大单体溶液pH值对HPEG型聚羧 酸减水剂合成的影响

作者:裴继凯1,2,李宪军1,3,任建国1,2,武恩瑞1,4,刘冠杰1,2,王自为1,2

关键字:大,单体,溶液,值对,HPEG,型,聚,羧酸,减,水剂,

 
(1.山西大学 混凝土 外加剂技术研究中心,山西 太原  030006;
2.山西大学 化学化工学院,山西 太原  030006;
3.山西大学 土木工程系,山西 太原  030013;
4.山西山 大合盛新材料股份有限公司,山西 太原  030006)
    摘要:分别在过硫酸铵(APS)和过氧化氢-维生素C(H2O2-Vc)2种引发体系下,通过水 溶液自由基共聚,合成HPEG型聚羧酸减水剂。采用凝胶渗透色谱(GPC)表征了不同pH值大单 体溶液合成的聚羧酸减水剂,测试了 合成减水剂的分散性及其在水泥颗粒表面的吸附率。结果表明,大单体溶液的pH值对该 类聚羧酸减水剂的合成影响很大,尤其对H2O2-Vc体系引 发的共聚反应影响更大,大单体溶液的pH值越小 对共聚反应越有利。
    关键词:聚羧酸减水剂;HPEG;pH值;合成;GPC;引发剂
    中图分类号:TU528.042+.2        文献标识码:A        文章编号:1001-702X(2020)10-0076-05
 
Effect of pH values of macromonomer solution on the synthesis of HPEG type polycarboxylate water reducer
PEI Jikai1,2,LI Xianjun1,3,REN Jianguo1,2,WU Enrui1,4,LIU Guanjie1,2,WANG Ziwei1,2
(1.Concrete Admixtures Technology Research Center of Shanxi University,Taiyuan 030006,China;
2.School of Chemistry and Chemical Engineering,Shanxi University,Taiyuan 030006,China;
3.Department of Civil Engineering,Shanxi University,Taiyuan 030006,China;
4.Shanxi University Hesheng New Materials Inc.,Taiyuan 030006,China)
    Abstract:Under the two initiation systems of ammonium persulfate(APS) and H2O2-vitamin C(H2O2-Vc),the HPEG-type poly-carboxylate water-reducing agent was synthesized by free radical copolymerization of aqueous solution. Gel permeation chromatography(GPC) was used to characterize the polycarboxylate water-reducing agent synthesized from macromonomer solutions with different pH values,and the dispersibility of the synthetic water-reducing agent and its adsorption rate on cement particles were tested. The results showed that the pH value of the macromonomer solution had a great influence on the synthesis of this type of polycarboxylate water reducer,especially for the copolymers initiated by H2O2-Vc redox system. The lower the pH value of macromonomer solution,the better the effect of copolymerization.
    Key words:polycarboxylate water reducer,HPEG,pH value,synthesis,GPC,initiator

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