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Star-structure polycarboxylic acid dispersing agent as well as preparation method and application thereof

A technology of star-shaped structure and polycarboxylic acid, applied in the field of concrete admixture, can solve the problems of high viscosity of concrete and insufficient initial dispersion performance

Active Publication Date: 2020-07-07
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention aims to overcome the problems of insufficient initial dispersion performance of the above-mentioned cement dispersant for low water-to-binder ratio, high early viscosity of concrete, etc., and provides a star-shaped polycarboxylic acid with easy-to-obtain raw material source, low production cost and simple production process High-performance water reducer and preparation method thereof

Method used

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  • Star-structure polycarboxylic acid dispersing agent as well as preparation method and application thereof
  • Star-structure polycarboxylic acid dispersing agent as well as preparation method and application thereof
  • Star-structure polycarboxylic acid dispersing agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] 1) Mix 120g of ethylenediamine and 0.12g of sodium hydroxide evenly, then vacuumize, under the protection of nitrogen, slowly raise the temperature to 80°C, slowly introduce 352g of ethylene oxide, keep the temperature for 2 hours, and cool down to obtain a compound with multiple amine groups The polyether macromonomer C.

[0068] 2) Put 14.8g of polyether macromonomer C with multiple amino groups obtained in step (1) and 19.6g of maleic anhydride under nitrogen protection, heat up to 60°C, add 0.02g of p-toluenesulfonic acid, and slowly heat up to 80°C, keep the temperature constant for 6h, and then lower the temperature to obtain the acylated product—polymerizable star-shaped macromonomer E.

[0069] 3) In a glass reactor equipped with a thermometer, a stirrer, a dropping funnel and a nitrogen inlet tube, add 200g of polyethylene glycol monomethyl ether acrylate (Mn=500g / mol), and simultaneously add 133.3g of deionized water, While stirring, the reaction vessel was p...

Embodiment 2

[0071] 1) Mix 103g of diethylenetriamine and 0.21g of potassium hydroxide uniformly and then vacuumize it. Under the protection of nitrogen, slowly raise the temperature to 120°C. After slowly feeding 580g of propylene oxide, keep the temperature for 1.5h, and cool down to obtain a compound with multiple amines. Based polyether macromonomer C.

[0072] 2) 13.9g of the polyether macromonomer C with multiple amino groups obtained in step (1) and 17.2g of methacrylic acid were heated up to 60°C under nitrogen protection, and after adding 0.03g of benzenesulfonic acid, the temperature was slowly raised to 110°C, constant temperature for 4h, cooling down to obtain the acylated product—polymerizable star-shaped macromonomer E.

[0073]3) In a glass reactor equipped with a thermometer, stirrer, dropping funnel and nitrogen inlet tube, add 200g polyethylene glycol monomethyl ether methacrylate (Mn=1000g / mol), and add 300g deionized water at the same time , While stirring, the reactio...

Embodiment 3

[0075] 1) Mix 103g of diethylenetriamine and 0.52g of sodium methoxide uniformly, then vacuumize, under the protection of nitrogen, slowly raise the temperature to 100°C, slowly introduce 1160g of propylene oxide, keep the temperature for 2 hours, and cool down to obtain a compound with multiple amine groups. Polyether macromonomer C.

[0076] 2) 13.9g of polyether macromonomer C with multiple amino groups obtained in step (1) and 30g of dimethacrylic acid were heated to 60°C under nitrogen protection, and after adding 0.44g of concentrated sulfuric acid, the temperature was slowly raised to 100 ℃, keep the temperature for 5 hours, and cool down to obtain the acylated product—polymerizable star-shaped macromonomer E.

[0077] 3) In a glass reactor equipped with a thermometer, a stirrer, a dropping funnel and a nitrogen inlet tube, add 200g of polyethylene glycol monomethyl ether methacrylate (Mn=2000g / mol), and simultaneously add 200g of deionized water , While stirring, the ...

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Abstract

The invention provides a polycarboxylic acid cement dispersing agent with a star-shaped structure and a preparation method thereof. The star-shaped polycarboxylate superplasticizer disclosed by the invention is obtained by the following steps: obtaining a polyether macromonomer with a plurality of amino groups by polymerizing polyethylene polyamine and epoxide anions; carrying out an amidation / imidization reaction to obtain a polymerizable star-shaped macromonomer, and carrying out free radical polymerization on the polymerizable star-shaped macromonomer, unsaturated acid, unsaturated phosphate and an unsaturated macromonomer to obtain the star-shaped polycarboxylate superplasticizer. And the produced product has the advantages of low mixing amount, high water reducing rate, small slump loss, good cement adaptability, remarkable reduction of slurry viscosity at a low water-binder ratio and the like. By adopting free radical polymerization, the invention has the advantages of simple synthesis method, low production process requirements, low production cost, small environmental pollution and the like.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures in building materials, in particular to a star-shaped polycarboxylic acid that can be used as a high-performance water reducer for concrete and a preparation method thereof. Background technique [0002] In recent decades, with the great progress of concrete preparation and construction technology at home and abroad, building structures such as super high-rise, long-span, and high-load have put forward higher requirements for the strength and durability of concrete. Concrete admixtures, as the fifth essential component of concrete besides cement, water, sand and gravel aggregates and mineral admixtures, are in increasing demand. As the most commonly used concrete admixture, polycarboxylate high-performance water reducer has the advantages of small dosage, high water reducing rate, good slump retention performance, and structural diversity. And durability, control of air-entraining, re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F222/06C08F230/02C08F220/06C04B24/26C04B103/30
CPCC08F290/062C04B24/246C04B2103/302C08F222/06C08F230/02C08F220/06
Inventor 冉千平王秀梅杨勇舒鑫周栋梁王涛毛永琳刘加平
Owner JIANGSU SOBUTE NEW MATERIALS
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