Study on sustained-release polycarboxylate superplasticizer prepared by EPEG macromonomer

Abstract

Ethylene glycol monomer polyoxyethylene ether (EPEG) is a new macromonomer that has been introduced in recent years. Its special molecular structure enables it to form copolymers with acrylic acid (AA) that are closer to the ideal copolymerization structure. However, the current production capacity is relatively small, so there are not many related studies. Therefore, this paper uses EPEG as the main raw material to prepare a slow-release polycarboxylate superplasticizer SP-YH. By studying the effects of different reaction conditions on the properties of SP-YH, the optimum synthesis conditions were determined. The structure of the polymer was characterized by gel permeation chromatography (GPC) and infrared spectroscopy (FTIR). In addition, the concrete test and hydration heat test results show that it has better slump protection performance and compression resistance than the commercial slump protection polycarboxylic acid water reducer.