摘要
以环氧乙烷/环氧丙烷嵌段聚醚和丙烯酸作为主要聚合单体,分别选用含酰胺基团的丙烯酰胺和2-丙烯酰胺-2-甲基丙磺酸作为功能单体,在常温常压下合成早强型聚羧酸减水剂。考察聚合体系中丙烯酸用量、氧化还原体系、链转移剂、反应温度等因素对产品性能的影响。结果表明,在n(聚醚单体)∶n(丙烯酸)∶n(丙烯酰胺)=1∶8∶0.24、H2O_(2)/抗坏血酸氧化还原体系、温度40℃条件下制备的减水剂早强效果最优。与掺常规聚羧酸减水剂相比,含酰胺基团早强型聚羧酸减水剂折固掺量为水泥质量的0.28%时,制得的混凝土1、3 d抗压强度可提高18.5%、17.8%,初、终凝时间分别缩短53%、35%。
Taking the block polyether which made from ethylene oxide/propylene oxide,and acrylic acid as the main polymerization monomer,and then acrylamide containing amide groups,and 2-acrylamide-2-methylpropane sulfonic acid were selected as functional monomers to produce early-strength polycarboxylate superplasticizer under normal temperature and pressure.The effects of different amounts of acrylic acid,redox system,chain transfer agent,reaction temperature and other factors on the products performance were investigated.The results showed that the early-strength performance of the superplasticizer was outstanding under the reaction conditions of n(polyether monomer)∶n(acrylic acid)∶n(acrylamide)=1∶8∶0.24,H2O_(2)/ascorbic acid redox system at 40℃.When the cement content of superplasticizer is 0.28%of the cement content,compared with conventional polycarboxylic acid superplasticizer,the 1 d and 3 d compressive strength of the superplasticizer which containing acylamide group could be increased by 18.5%and 17.8%respectively.The initial and final setting time were reduced by 53%and 35%respectively.
作者
郑建民
余小荣
吴朱亮
邓益强
程丽华
ZHENG Jianmin;YU Xiaorong;WU Zhuliang;DENG Yiqiang;CHENG Lihua(College of Chemical Engineering,Guangdong University of Petrochemical Technology,Maoming 525000,China;Epoxy Fine Chemical Engineering Technology Research Center of Guangdong Oxiranchem,Maoming 525000,China;Guangdong Oxiranchem Co.Ltd.,Maoming 525000,China)
出处
《新型建筑材料》
2023年第8期11-14,18,共5页
New Building Materials
基金
广东省科技创新战略专项(2022DZXHT021,2021S0008)
茂名绿色化工研究院“重大创新”类项目(MMGCIRI 2022YFJH-Z-001)。
关键词
聚醚单体
丙烯酸
酰胺基团
早强型聚羧酸减水剂
polymerization monomer
acrylic acid
acylamide group
the early-strength polycarboxylate superplasticizer
作者简介
郑建民,男,1981年生,工程师,E-mail:zjm181@163.com;通讯作者:邓益强,博士,副教授,E-mail:yqdeng@gdupt.edu.cn。
