大单体溶液pH值对HPEG型聚羧酸减水剂合成的影响  

Effect of pH values of macromonomer solution on the synthesis of HPEG type polycarboxylate water reducer

作　　者：裴继凯[1,2] 李宪军 任建国[1,2] 武恩瑞 刘冠杰 王自为[1,2] PEI Jikai;LI Xianjun;REN Jianguo;WU Enrui;LIU Guanjie;WANG Ziwei(Concrete Admixtures Technology Research Center of Shanxi University,Taiyuan 030006,China;School of Chemistry and Chemical Engineering,Shanxi University,Taiyuan 030006,China;Department of Civil Engineering,Shanxi University,Taiyuan 030006,China;Shanxi University Hesheng New Materials Inc.,Taiyuan 030006,China)

机构地区：[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

出　　处：《新型建筑材料》2020年第10期76-80,共5页New Building Materials

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。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.

关 键 词：聚羧酸减水剂 HPEG pH值 合成 GPC 引发剂 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]