Preparation method of high water-reducing solid high performance polycarboxylate water reducer

Abstract

The invention provides a preparation method of a high water-reducing solid high performance polycarboxylate water reducer and relates to the field of concrete additives. The preparation method comprises the following steps: heating and uniformly stirring 10-15 parts of polyethylene glycol monomethyl ether 2000, 30-40 parts of polyethylene glycol monomethyl ether 1000, 5-8 parts of methacrylic acid, 1-2 parts of p-toluenesulfonic acid and 0.5-1 part of hydroquinone which are mixed, and taking out the materials after heating, and recovering the temperature to room temperature to obtain a macromolecular monomer; uniformly mixing the obtained macromolecular monomer, 0.5-0.8 part of mercaptoacetic acid and 10-15 parts of deionized water, and heating and cooling the mixture to obtain a #1 mixedsolution; uniformly mixing the obtained mixed solution, 0.2-0.4 part of a vitamin C solution and 0.1-0.2 part of an initiator, and stirring the mixture to obtain a #2 mixed solution; adding a sodium hydroxide solution into the obtained #2 mixed solution, and adjusting the pH value to 6.5-7 to obtain a water reducer solution; and lyophilizing the obtained water reducer solution to obtain the high water-reducing solid high performance polycarboxylate water reducer. The high water-reducing solid high performance polycarboxylate water reducer can reduce the viscosity of concrete effectively and the concrete has relatively high retentivity.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to a preparation method of a high-water-reducing solid polycarboxylate high-performance water-reducer. Background technique [0002] Concrete is the largest and most widely used building material in the world. Over the past few decades, concrete technology has entered a new stage of development, and its application range has been further expanded. In recent years, with the development of my country's construction industry, high-grade concrete is gradually entering the construction market due to its high strength, good integrity, and low self-weight. However, due to the use of a lower water-binder ratio and a larger amount of cementitious material, high-grade concrete has the problems of high viscosity and slow flow speed in application. [0003] The excessive decrease of concrete slump over time has always been a problem that plagues normal construction. The amount of polycarbo...

AI Technical Summary

Problems solved by technology

[0003] The excessive decrease of concrete slump over time has always been a problem that plagues normal construction

The amount of polycarboxylate superplasticizer itself is very low, and a large amount of superplasticizer will be consumed in the early stage of concrete mixing, resulting in the lack of actual effective ingredients in the later concrete, resulting in a decline in its application performance, especially the serious loss of slump in the later stage , cannot meet the requirements of normal construction