A temperature-resistant polycarboxylate water reducer, a preparation method and application thereof

By constructing a dual-temperature-resistant system of heat-resistant polycarboxylate molecular structure and aqueous environment, a heat-resistant polycarboxylate water-reducing agent was synthesized, solving the problem of water-reducing performance degradation at high temperatures and achieving high-efficiency water reduction and concrete performance improvement in cement mills.

CN117164771BActive Publication Date: 2026-07-14HUAXIN CEMENT CO LTD
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Patent Information

Application Number
CN202311099618.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-08-28
Publication Date
2026-07-14
Estimated Expiration
2043-08-28

AI Technical Summary

Technical Problem

Existing polycarboxylate superplasticizers exhibit reduced water-reducing performance in cement mills at temperatures above 100°C, making it difficult to maintain good water-reducing properties under high-temperature conditions.

Method used

A dual-temperature-resistant system for polycarboxylic acid molecular structure and aqueous environment was constructed using heat-resistant functional monomers and excipients. The heat-resistant polycarboxylic acid water-reducing agent was synthesized by free radical polymerization. Tween series surfactants were added to reduce the adsorption effect of inorganic salts and improve the boiling point and dispersibility of the aqueous solution.

Benefits of technology

It maintains good water-reducing properties in the high-temperature environment above 100℃ inside the cement mill, reduces water loss, improves the fluidity and early strength of concrete, reduces cement usage, and reduces carbon emissions.

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Abstract

The application discloses a temperature-resistant polycarboxylic water reducing agent and a preparation method and application thereof, wherein an unsaturated polyoxyethylene ether monomer is dispersed in water, and the temperature is raised to 25-30 DEG C; an oxidizing agent is added, and stirring is carried out for 5-15 min; solution A and solution B are added dropwise into a reaction system within 1-1.5 h; wherein the unsaturated functional monomer and the heat-resistant functional monomer are dispersed in water to prepare solution A; a chain transfer agent and a reducing agent are dispersed in water to prepare a mixed solution B; an organic neutralizing agent is added to adjust the pH to 6-7; and heat-resistant auxiliaries are added to prepare the temperature-resistant polycarboxylic water reducing agent; the polycarboxylic acid molecular structure is designed according to the high-temperature working condition in a cement mill, and the aqueous solution environment of the polycarboxylic water reducing agent is designed, so that the water reducing performance of the polycarboxylic water reducing agent can be maintained under the high-temperature environment above 100 DEG C in the cement mill, and the polycarboxylic water reducing agent can play a good water reducing characteristic in the cement and concrete mixing process.
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Citation Information

Patent Citations

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    CN109053965A

  • Preparation method of polycarboxylic acid water reducing agent having thermostability

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  • Polycarboxylate-type high-performance water reducing agent and synthesis method thereof

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