Improved polycarboxylate superplasticizer as well as preparation method and application thereof

Through the preparation method of an improved polycarboxylic acid water reducing agent, the copolymerization reaction of unsaturated fluorine-containing POSS and other raw materials is used to form a polymer with a variety of functional groups, which solves the problem that traditional water reducing agents are difficult to take into account in the application of island concrete, and significantly improves the durability and environmental corrosion resistance of the concrete.

CN119751778AActive Publication Date: 2025-04-04NANNING XINGDIAN CONCRETE CO LTD +1
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Patent Information

Application Number
CN202411922785.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-25
Publication Date
2025-04-04
Estimated Expiration
2044-12-25

AI Technical Summary

Technical Problem

Traditional polycarboxylic acid water reducing agents are difficult to take into account the comprehensive properties of water reduction, freezing resistance, permeability and chloride ion corrosion in the application of island concrete.

Method used

By adopting the preparation method of an improved polycarboxylic acid water reducing agent, a polymer with rich carboxylic acid groups, amine functional groups and phosphate groups is formed by copolymerization of unsaturated fluorine-containing POSS, unsaturated acids, unsaturated amines and unsaturated long-chain oxyethylene phosphate esters, which enhances its anti-chlorine ion erosion, anti-freeze and anti-permeability.

Benefits of technology

It significantly improves the workingability and durability of concrete, enhances the resistance to frost, seepage and chloride ion corrosion resistance, and extends the service life of concrete structures.

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Abstract

The invention discloses a preparation method of an improved polycarboxylic acid water reducing agent, which comprises the following steps: S1, weighing the following raw materials in parts by weight: unsaturated fluorine-containing POSS (Polyhedral Oligomeric Silsesquioxane), unsaturated acid, unsaturated amine and unsaturated long-chain oxyvinyl phosphate, and adding into a reaction container; s2, adding a catalyst and an initiator; under the protection of nitrogen, heating the reaction system to a certain temperature, and keeping the temperature for a period of time, so that the raw materials are subjected to an addition copolymerization reaction; and S3, after the copolymerization reaction is finished, cooling and separating the reaction liquid to obtain the improved polycarboxylate superplasticizer. The improved polycarboxylic acid water reducing agent prepared by the preparation method disclosed by the invention not only has an excellent water reducing effect, but also endows concrete with excellent anti-freezing, anti-permeability and chloride ion erosion resistance, so that the workability and durability of the island building concrete are remarkably improved.
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