低温合成改性聚醚型聚羧酸减水剂的工艺研究  

Study on synthesis of a new type of modified polyether polycarboxylate water reducer under low temperature

作　　者：田应凤[1] 朱霞萍[1] 项念念[1] 王奎[1] 王海[1] 

机构地区：[1]成都理工大学材料与化学化工学院,四川省矿产资源化学高校重点实验室,四川成都610059

出　　处：《新型建筑材料》2013年第12期88-92,共5页New Building Materials

基　　金：四川省高等教育质量工程项目(SZH1106CX05)

摘　　要：低温合成了聚醚型聚羧酸减水剂,对合成产物进行红外表征和性能测试。最优合成工艺条件是:以过硫酸铵/H2O2为引发体系,用量分别为单体总质量的1.5%和3.0%;甲基烯丙基聚氧乙烯醚(TPEG)与丙烯酸(AA)的摩尔比为1∶4;以巯基乙酸作链转移剂,用量为单体总质量的1.6%;聚合温度为40℃,聚合反应时间5 h。当减水剂折固掺量为0.2%,水灰比为0.29时,水泥净浆流动度可超过280 mm,60 min流动度无损失,减水率达27.5%,合成的聚羧酸减水剂具有良好的分散性和分散保持性。The high performance polycarboxylate water reducer was synthesized under low temperature conditions,the perfor- mance of product was tested and the structure of product was characterized by IR. The optimal synthesis conditions were deter- mined： ammonium persulfate and H202 as initiator, used in an amount of 1.5% and 3.0% of the total mass of the monomers, respec- tively,rt（TPEG）：n（AA）=l：4,the chain transfer agent was thioglycolic acid and the dosage is 1.6% of the total mass of the monomers, the polymerization temperature was 40 ~C and the polymerization reaction time was 5 hours. The results showed that when the dosage of polycarboxylate water reducer was 0.2% of cement mass,together with 0.29 of water cement ratio,the fluidity of cement paste could exceed 280 mm,60 min fluidity without loss,the water-reducing rate was 27.5%,the polyearboxylate water reducer had higher dispersbility and dispersion retention.

关 键 词：低温合成 聚醚型聚羧酸减水剂 水泥净浆流动度 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]