Synthesis and performance study of a VPEG type polycarboxylate high-performance superplasticizer
LI Yanjun
LUO Jiantao
KONG Fanyu
Abstract：A VPEG type polycarboxylic acid superplasticizer was synthesized by copolymerization of 4-hydroxybutyl vinyl poly-oxyethylene ether(VPEG)with acrylic acid,and its properties were studied.The results show that the relative molecular weight of VPEG monomer should be controlled at 2200,the acid-ether ratio should be 4,H202 as the oxidizing agent,ferrous gluconate should be used as the reducing agent,n(ferrous gluconate)∶n(H202)=1∶70,sodium sulfite should be used as the reducing assistant,with a proportion of 3/1 to the ferrous gluconate,and the amount of chain transfer agent should be 4％.The synthesis temperature,time and pH should be controlled at 15 ℃,45 min and 5.C30 concrete prepared using the water reducing agent obtained by this process has a water reduction rate of 29％,a bleeding rate ratio of 16％,an air content of 3.8％,compressive strength ratios of 155％and 137％at 7 and 28 days,a segregation rate of 4.1％,a bleeding rate of 0.5％,and good cohesion and fluidity.
Keywords：VPEGpolycarboxylic acid superplasticizersynthesis method
Publication Date：2024-10-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 52-56 )