The application of EPEG-type polycarboxylate water reducer in concrete is gradually widespread and studying its preparation process and performance comparison will help promote the EPEG market. In this study, ethylene glycol nonvinyl polyoxymethylene ether (EPEG-2400), acrylic acid (AA) and hydroxyethyl acrylate (HEA) were used as the main synthetic monomers. Under the redox initiation system of hydrogen peroxide-formaldehyde sodium bisulfite, EPEG-type water-retaining polycarboxylate water reducer was synthesized by free radical copolymerization in aqueous solution. The influence of different pH values on the dispersibility of the synthesized polycarboxylate water reducer was studied. The results show that different pH values have little influence on the molecular weight of EPEG water-retaining polycarboxylate water reducer and the work performance of EPEG-synthesized water-retaining polycarboxylate water reducer is better under neutral conditions.
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Zhiqun Lin (2024) studied this question.
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