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Polyether class polycarboxylic acid high-efficiency water reducing agent and preparation method thereof

A high-efficiency water reducer and polycarboxylic acid technology, which is applied in the field of structure and engineering, and concrete materials, can solve the problems of complex production process of water reducer, large loss of slump over time, poor cement adaptability, etc., and achieve improvement Concrete pore structure and compactness, improving project quality and service life, and low cost

Inactive Publication Date: 2009-09-23
大连华健科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of the previous water reducing agent such as complex production process, poor fluidity, high cost, large slump loss over time, poor adaptability to cement, and organic solvent pollution, and provide a simple process, low cost, Polyether-based high-performance polycarboxylate water reducer with excellent performance and preparation method thereof

Method used

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  • Polyether class polycarboxylic acid high-efficiency water reducing agent and preparation method thereof
  • Polyether class polycarboxylic acid high-efficiency water reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add water 80g, allyl polyoxyethylene ether (M W =2400) 96g, stirred and heated up to 80°C, while adding dropwise 25g of 10% ammonium persulfate aqueous solution and 15.68g of maleic anhydride, 1.72g of methacrylic acid, 1.44g of acrylic acid, 10.4g of hydroxyethyl methacrylate and 89g of The monomer aqueous solution composed of water, the dropping time is 3.5 hours, after the dropping is completed, keep warm for 3 hours, naturally cool to room temperature, neutralize with dilute lye until the pH value reaches 6.8-7.2, and obtain polyether polycarboxylic acid highly efficient Aqueous agent PC-1, its solid content is about 40%.

Embodiment 2

[0027] Add 100 g of water, allyl polyoxyethylene ether (M W =2400) 96g, stir and heat up to 90°C, while adding dropwise 50g 10% ammonium persulfate and 4.5g 30% hydrogen peroxide composite initiator solution, dropwise add the monomer formed by 2.8g acrylamide, 15.7g maleic anhydride and 130g water Aqueous solution, the dropping time is 4 hours, keep warm for 3 hours after dropping, naturally cool to room temperature, neutralize with dilute lye until the pH value reaches 6.8-7.2, and obtain polyether polycarboxylate high-efficiency water reducer PC-2 , and its solid content is about 30%.

Embodiment 3

[0029] Add water 300g, allyl polyoxyethylene ether (M W =2200) 88g, stirring and warming up to 80°C, while adding dropwise 50g 4% potassium persulfate aqueous solution and dropwise adding the monomer aqueous solution composed of 13.7g maleic anhydride and 65g water, the time for adding is 3 hours, after the dropwise addition is completed Keep warm for 4 hours, cool down to room temperature naturally, and neutralize with dilute lye until the pH value reaches 6.8-7.2 to obtain polyether polycarboxylate superplasticizer PC-3 with a solid content of about 20%.

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Abstract

The invention relates to a polyether class polycarboxylic acid high-efficiency water reducing agent and a preparation method thereof, belonging to the field of concrete materials, structures and engineering of building materials. The polyether class polycarboxylic acid high-efficiency water reducing agent raises the temperature of water solutions of 15-55 mass percent of allyl polyethenoxy ether and 0-6 mass percent of chain transfer agent is raised to 50-90 DEG C, one side is dropwise added with a water solution of 0.01-0.9 mass percent of an evocating agent, one side is dripwise added with miscible liquids of 3-15 mass percent of unsaturated acids and one or more than one derivative thereof, the temperature is kept unchanged, and the water solution and the miscible liquids are completely dropped within 2-6 hours, the temperature is preserved for 1-6 hours and naturally cooled to room temperature, and the mixed solution is neutralized by sig water till a PH value reaches 6.8-7.2 so as to obtain the polyether class polycarboxylic acid high-efficiency water reducing agent. The polyether class polycarboxylic acid high-efficiency water reducing agent and the preparation method thereof have simple technique, low cost and good property, can effectively reduce the water-cement ratio of concrete, improves the compaction rate of a pore structure of the concrete, enhances the strength and the durability of the concrete and has great significance on enhancing the engineering quality, prolonging the service life, reducing the engineering cost, reducing the environment pollution, and the like.

Description

technical field [0001] The invention relates to a polyether polycarboxylate high-efficiency water reducer and a preparation method thereof, belonging to the field of concrete materials, structures and engineering in building materials. Background technique [0002] In the field of modern concrete technology, water reducing agent is one of the admixtures to improve the rheological properties of concrete mixing, and has been regarded as the fifth component of concrete besides cement, sand, stone and water. The application of water reducing agent can effectively reduce the water-cement ratio of concrete, improve the pore structure and compactness of concrete, and improve the strength and durability of concrete. It is of great significance to improve project quality and service life, reduce project cost, and reduce environmental pollution. . [0003] Common admixtures mainly include lignosulfonate series, naphthalene series, melamine series, sulfamate series, polycarboxylic aci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/24C04B103/30C08F283/06
CPCC04B2103/302C04B24/2647C04B24/267C04B24/2694
Inventor 吴长龙张炜荀武举辛德胜王跃松石岩姜海刚
Owner 大连华健科技有限公司
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