摘要
选用甲基烯丙基聚氧乙烯醚(TPEG)和丙烯酸(AA)为单体,双氧水(H_2O_2)为引发剂,抗坏血酸(Vc)和亚硫酸氢钠(SHS)为还原剂,常温下合成聚羧酸高效减水剂,通过改变复合引发体系的种类及用量,来探究其对减水剂性能的影响。通过正交试验得出最佳物料配比为n(H_2O_2)∶n(Vc)∶n(SHS)=0.15∶0.02∶0.072。通过单因素实验可得出,水泥净浆流动度和粘均分子量均随H_2O_2、Vc、SHS用量的增加呈现先增大后减小的趋势。当n(H_2O_2)∶n(Vc)∶n(SHS)=0.13∶0.03∶0.054时,水泥净浆流动度和粘均分子量最高;随着减水剂掺量的增加,Zeta电位绝对值及吸附量随之增加,分散性能逐渐提高。
Selecting methylallyl ethoxylates and acrylic acid as monomer, synthesizing high performance polycarboxylate superplasticizer at room temperature. Hydrogen peroxide （H2O2 ） as the initiator, ascorbic acid （Vc） and sodium bisulfite （SHS） as a reducing agents. The effect of type and amount of initiator as well as reducing agents on the performance of superplasticizer was studied. By orthogonal test, experimentally derived the optimum material ratio, n（ H2O2 ） ： n （Vc） ： n （SHS） = 0.15： 0.02： 0. 072. By single factor experiment results showed that cement paste fluidity and viscosity average molecular weight first increases and then decreases by hydrogen peroxide, ascorbic acid, sodium bisulfite dosage increased. The viscosity-average molecular weight and cement paste fluidity is the highest when n（ H2O2 ） ： n（Vc） ： n（SHS） = 0.13： 0.03： 0. 054 ; With dosage of superplasticizer increasing, the absolute value of Zeta potential and the adsorption amount increased, the dispersion ability of superplastieizer increasing gradually.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2015年第11期3078-3083,共6页
Bulletin of the Chinese Ceramic Society
关键词
聚羧酸减水剂
三元复合引发体系
分散性能
polycarboxylate superplasticizer
ternary complex initiation system
dispersing ability
