低温EPEG大单体聚羧酸减水剂合成工艺及性能研究  

Study on Synthesis Process and Performance of Low Temperature EPEG Macromonomer Polycarboxylate Superplasticizer

作　　者：杨巧 YANG Qiao(Hunan Kezhijie New Materials Co.,Ltd.)

机构地区：[1]湖南科之杰新材料有限公司

出　　处：《广东建材》2025年第2期48-51,共4页Guangdong Building Materials

摘　　要：使用新型的EPEG聚醚大单体,在低温条件下合成聚羧酸减水剂。通过正交试验研究EPEG型聚羧酸减水剂合成中氧化剂(H_(2)O_(2))、链转移剂(ME)、还原剂(E51)、酸醚比对分散性能的影响。结果表明:EPEG聚羧酸减水剂合成中4个因素对分散性能影响的大小顺序为氧化剂(H_(2)O_(2))>链转移剂(ME)>还原剂(E51)>酸醚比。最优合成工艺为:氧化剂(H_(2)O_(2))、还原剂(E51)、链转移剂(ME)分别占大单体质量的0.83%、0.10%、0.33%,酸醚比4.2,AB料的滴加时间分别为40min、50min,起始最佳滴加温度为15℃。试验结果表明,合成的EPEG聚羧酸减水剂PCE-1具有优异的混凝土减水及保坍性能。减水剂PCE-1表征后,图谱显示产品的实际分子结构与设计基本一致。Polycarboxylate superplasticizer was synthesized at low temperatures using a new EPEG polyether macromonomer.The effects of Oxidizing agent(H_(2)O_(2)),Chain transfer agent(ME),Reducing agent(E51),and Acid ether ratio on the dispersion properties in the synthesis of EPEG-type polycarboxylate superplasticizer were investigated by orthogonal tests.The results show that the order of the influence for four factors on the scatter performance is Oxidizing agent(H_(2)O_(2))>Chain transfer agent(ME)>Reducing agent(E51)>Acid ether ratio,and the optimal proportioning is 0.83%,0.33%,0.10%,acrylic acid to monomer molar ratio is 4.2.The dropwise duration is 40min and 50min separately of A and B material,and the optimal temperature is 15℃at the beginning of the reaction.The concrete test results show that the synthesized EPEG polycarboxylate superplasticizer PCE-1 has excellent properties of water reducing and slump retaining for concrete.After characterization of the water reducing agent PCE-1,the mapping shows that the practical molecular structure of the product is basically consistent with the scheme design.

关 键 词：聚羧酸减水剂 EPEG 正交试验 性能 低温 

分 类 号：TU5[建筑科学—建筑技术科学]