聚羧酸减水剂合成及其分散性能和保坍性能分析  

Synthesis of Polycarboxylate Superplasticizers and Analysis on Its Dispersibility and Slump Retaining Property

作　　者：尹新龙[1] 蔡杰龙 吴笑梅[2] 杨永民[1,2] 

机构地区：[1]广东省水利水电科学研究院,广东省水利重点科研基地,广东广州510635 [2]华南理工大学材料科学与工程学院,广东广州510640

出　　处：《广东水利水电》2014年第9期49-53,65,共6页Guangdong Water Resources and Hydropower

摘　　要：聚羧酸减水剂是一种新型高性能减水剂,相比前两代减水剂(木质素、萘系等)具有突出优点。该文以甲基烯丙基聚醚(TPEG)、丙烯酸(AA)和丙烯酸酯(HA)等单体原材料合成聚羧酸减水剂。通过水泥净浆、砂浆和混凝土性能测试结果表明,合成聚羧酸减水剂最佳工艺条件为:引发剂和链转移剂总摩尔量分别为大单体的3%和2%,聚合温度为60℃。当n[TPEG]∶n[AA]=1∶4时合成聚羧酸减水剂分散性能较佳,砂浆减水率可达38.97%;当n[TPEG]∶n[AA]∶[HA]=1∶2∶2时合成聚羧酸减水剂保坍性能突出,水泥净浆流动度2 h时保持放大,3 h内无损失。该试验合成两种聚羧酸减水剂在水泥净浆、砂浆和混凝土中对应的分散性能和保坍性能均优越于所选市售同类型的减水剂。As a new type of high performance water reducer polycarboxylate superplasticizers possess outstanding advantages compared with previous ones such as lignin and naphthalene .In this article, methyl alkenyl polyoxyethylene polyoxypropylene ether （TPEG）, acrylic acid（AA） and acrylate（HA） are used as raw materials to synthesize polycarboxylate superplasticizers which are tested by cement paste , mortar and concrete .And the result shows that the optimum synthesis condition i Total molar weight of initiator is 3% of macromonomer and chain transfer agent is 2%, the polymerization temperature is 60 ℃.The dispersibility of polycarboxylate superplasticizer is comparatively better when the monomer system is n[ TPEG]∶n[ AA] =1∶4.And the maximum mortar water reducing rate reaches 38.97%.The slump retaining property of polycarboxylate superplasticizer is outstanding when the monomer system is n[TPEG]∶n[AA]∶[HA] =1∶2∶2, the fluidity of cement paste keep amplifying in 2h and losses little in 3h.The dispersibility and slump retaining property of corresponding polycarboxylate superplasticizer synthesized in the test behaves better respectively in cement paste , mortar and concrete compared with the same type of commercial polycarboxylate superplasticizer .

关 键 词：减水剂 聚羧酸 合成 分散性能 保坍性能 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]