粉末状缓释型聚羧酸减水剂的制备及性能研究  

Preparation and properties of set retarding type polycarboxylate superplasticizer powder

作　　者：逄鲁峰[1,2] 安昊文 赵淑静 王恒 PANG Lufeng;AN Haowen;ZHAO Shujing;WANG Heng(School of Civil Engineering,Shandong Jianzhu University,Jinan 250100,China;Shangdong Huadi Construction Technology Co.,Ltd.,Jinan 251400,China;Rizhao Urban Investment Construction Group Co.,Ltd.,Rizhao 276800,China;Shandong Province Water Diversion Project Operation and Maintenance Center Qingdao Branch,Qingdao 266035,China)

机构地区：[1]山东建筑大学土木工程学院,山东济南250100 [2]山东华迪建筑科技有限公司,山东济南251400 [3]日照城投建设集团有限公司,山东日照276800 [4]山东省调水工程运行维护中心青岛分中心,山东青岛266035

出　　处：《混凝土与水泥制品》2024年第5期23-28,共6页China Concrete and Cement Products

摘　　要：以乙二醇单乙烯基聚乙二醇(EPEG)为大单体,调节丙烯酸羟乙酯和丙烯酸羟丙酯与大单体的摩尔质量比,以巯基丙酸为链转移剂,双氧水与次磷酸钠为氧化还原体系,并用中和溶剂调节减水剂母液pH值,制备了一种适用于离心喷雾干燥技术的粉末状缓释型聚羧酸减水剂PC-1000。通过正交试验确定了合成PC-1000粉末的最佳工艺参数为酸醚比3.0,酯醚比4.5,链转移剂用量0.36%(占大单体的质量比),母液pH值为8。性能测试结果表明,通过离心喷雾技术制备出的PC-1000粉末在净浆测试中2 h流动度无损失,表现出优异的保坍效果。PC-1000粉末已在灌浆料和压浆料中成功应用。Ethylene glycol monovinyl polyethylene glycol(EPEG)was used as large monomer to adjust the molar mass ratio of hydroxyethyl acrylate and hydroxyl propyl acrylate to large monomer.By using mercaptopropionic acid as chain transfer agent,hydrogen peroxide and sodium hypophosphate as oxidation-reduction system,and adjusting the pH value of the mother liquor of the polycarboxylate superplasticizer with neutralizer,a kind of powder set retarding polycarboxylate superplasticizer PC-1000 powder suitable for centrifugal spray drying was prepared.The optimum process parameters are determined by the orthogonal test as follows.Acid ether ratio is 3.0,ester ether ratio is 4.5,and chain transfer agent content is 0.36%(mass ratio of large monomer).The performance test results show that the PC-1000 powder prepared by centrifugal spray technology has no loss of fluidity in 2 h in the actual slurry test,showing excellent slump retention effect.PC-1000 powder has been successfully applied in grout and pressed slurry.

关 键 词：新型聚醚大单体 离心喷雾 缓释 粉末 工业生产 

分 类 号：TU528.042[建筑科学—建筑技术科学]