Study on the synthesis and compound application of a new type of polycarboxylate water reducer
WANG Lijing
CAO Qian
LIU Qinghai
TANG Jinbiao
ZHANG Derun
Abstract：A polycarboxylic acid water-reducing mother liquor and a slump-retaining mother liquor were synthesized in this paper.The main synthetic factors were optimized through single factor test method,and it is compounded with defoaming agents,air entraining agents and retarders to investigate its performance in concrete.Experiments show that the optimal synthesis formula of polycarboxylic acid water-reducing mother liquor is:[n(AA)∶n(TPEG)]4.0,dosage of both AMPS and SMAS is 2%of the mass of the macromonomer,the initiation system is H2O2/Vc,dosage of H2O2 initiator is 1%of the mass of the macromonomer.The mini-mum saturated dosage of the polycarboxylic acid water-reducing mother liquor synthesized with the optimal formula is 0.3%,and at this dosage,its water reduction rate is as high as 25.33%.The optimal synthesis formula of polycarboxylic acid slump-retaining mother liquor is as follows:dosage of H2O2 initiator is 0.9%of the mass of the macromonomer;the molar ratio of HEA,HPA,dimethyl itaconate and dimethyl fumarate is 9∶3∶2∶2;and the dosage of compounding agent is 4%of the mass of the macromonomer.The fluidity of cement paste with 0.2%slump-retaining mother liquor prepared with the optimal ratio was still able to reach 275 mm at the 4th hour,indicating that it has good slump-retaining performance.The compounding test shows that the two mother liquors can meet the actual engineering needs.
Keywords：R&D and engineering applicationcompounding processwater-reducing mother liquorslump-retaining mother liquor
Publication Date：2026-01-25
Online Publishing Date：2026-03-17(First online date of this platform, not the publication date of the document)
Pages：6( 120-125 )