Low air-entrained and viscosity-reduced slow-release polycarboxylate water reducer and preparation method thereof

Abstract

The invention provides a low air-entrained and viscosity-reduced slow-release polycarboxylate water reducer and a preparation method thereof. The low air-entrained and viscosity-reduced slow-release polycarboxylate water reducer is obtained by carrying out copolymerization reaction on a polyether monomer, a viscosity reducer, an unsaturated acid monomer and an unsaturated acid hydroxyl alkyl ester under the action of an initiator and a molecular weight modifier and adding an alkaline solution for neutralization until the pH value is 6-7. The low air-entrained and viscosity-reduced slow-release polycarboxylate water reducer has an excellent slow-release performance and a significant effect of delaying concrete coagulation time; the mobility of concrete is improved; meanwhile, the slump loss resistance and the water-reducing property of the polycarboxylate water reducer are also ensured; the durability and the later strength of the concrete are improved; the production technology is simple and the production cost is low; and the low air-entrained and viscosity-reduced slow-release polycarboxylate water reducer has good economic benefits and social benefits.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a slow-release polycarboxylate water reducer with low air-entrainment and viscosity reduction and a preparation method thereof. Background technique [0002] Concrete is the most widely used building material in modern times. It has the advantages of abundant raw materials, low price, simple process, high strength and good durability. With the continuous improvement of the performance of concrete in all aspects, the requirements for concrete superplasticizers are also getting higher and higher. As a new generation of high-efficiency water reducer, polycarboxylate superplasticizer has been widely used in concrete, and its performance has been widely recognized. However, polycarboxylate water reducer will bring high air content during application, which will affect properties of concrete. [0003] In addition, commercial concrete and pumping concrete that can realize ...

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned defects and problems of the prior art, the object of the present invention is to provide a slow-release polycarboxylic acid with low air-entrainment and viscosity reduction that can improve the dispersibility of cement particles, reduce the viscosity of concrete, and have excellent retarding effect. The water reducer and its preparation method solve the technical problem that the existing polycarboxylate water reducer has poor retarding effect, which causes high viscosity of concrete and affects concrete construction.