Preparation method of triisopropanolamine modified early strength polycarboxylate superplasticizer

Abstract

The invention relates to a preparation method of a triisopropanolamine modified early strength polycarboxylate superplasticizer. The preparation method comprises the following steps of (1) selecting raw materials; (2) dissolving polyester macromonomer, acrylic acid and maleic acid triisopropanolamine ester while stirring to obtain a uniform solution, then, adding an oxidizing agent, and stirring to obtain a uniform solution; (3) adding a reducing agent and chain transfer agent mixture into the uniform solution obtained in the step (2) at one step, continuing to stir, and adding a proper amount of deionized water to obtain the early strength polycarboxylate superplasticizer. The preparation method has the following main advantages that 1, the water reducing ratio is high, cement particles can be effectively dispersed, and the early stage hydration is promoted; 2, triisopropanolamine can be slowly released in an alkaline environment for cement hydration, so that the hydration is further promoted, the early strength is improved, but the initial flowability of slurry is not affected; 3, a one-step method and a one-step feeding way are adopted in the preparation method, and the preparation method is simple in process and short in reaction period.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a preparation method of an early-strength polycarboxylate water reducer modified by triisopropanolamine. Background technique [0002] The excellent properties of polycarboxylate superplasticizers, such as high water reducing rate and high slump retention, have been generally recognized by the industry, but for prefabricated construction projects, high early strength under low temperature conditions, traditional polycarboxylate superplasticizers have obvious problems performance defects. Usually, by introducing a strong adsorption group into the molecular structure, the molecules of the water reducing agent are quickly adsorbed on the surface of the cement particles, so that they are quickly consumed by the hydration products, thereby reducing the inhibitory effect of the water reducing agent on the formation of hydration products, which is not premature. Instead, r...

AI Technical Summary

Problems solved by technology

[0007] All in all, there is no early-strength polycarboxylate superplasticizer with wide adaptability, strong compatibility, simple process and excellent performance.

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