Method for preparing ether ester copolymer high-efficiency water reducer

A technology of high-efficiency water reducer and copolymer, which is applied in the field of preparation of ether-ester copolymer high-efficiency water reducer, and can solve the problems of unstable quality of free radical polymerization products and cumbersome synthesis process, etc.

Inactive Publication Date: 2009-09-16
上饶市天佳新型材料有限公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the synthesis process of similar water reducing agents is generally more cumbersome, and the quality of free radical polymerization products is not stable, and other shortcomings still exist

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A). Put methyl methacrylate and polyethylene glycol into the reactor at a weight ratio of 2:1.2, dilute with water to a concentration of 30%, and react at a temperature of 80°C for 4.5 hours to complete the esterification reaction and form β-carbonyl esters;

[0018] B). Add 15% of the total amount of raw material methyl polyoxyethylene ether to the product of A), control the temperature at 65 ° C, stir, and then slowly add 55 g of benzoyl peroxide to the addition reaction, and control the drop Speed, so that it drops within 2 hours, and then control the reaction temperature within the range of 85 ° C, and react for 4 hours to form a polymer compound with a certain molecular weight containing groups such as ether esters;

[0019] C). After the addition reaction in B), add alkali to neutralize and stir, so that the pH value of the material is 8±0.5, and the ether-ester copolymer superplasticizer is obtained;

Embodiment 2

[0021] A) Put methyl methacrylate and polyethylene glycol into the reactor at a weight ratio of 2:1, dilute with water to a concentration of 30%, and react at a temperature of 83°C for 4 hours to complete the esterification reaction and generate β - carbonyl esters;

[0022] B). Add 18% of the total amount of raw material methyl polyoxyethylene ether to the product of A), control the temperature at 60 ° C, stir, and then slowly add 50 g of benzoyl peroxide to the addition reaction, and control the drop Speed, so that it drops within 2 hours, and then control the reaction temperature in the range of 75 ° C, react for 4.5 hours, and form a polymer compound with a certain molecular weight containing groups such as ether esters;

[0023] C). After the addition reaction in B), add alkali to neutralize and stir, so that the pH value of the material is 8±0.5, and the ether-ester copolymer superplasticizer is obtained;

Embodiment 3

[0025] A). Put methyl methacrylate and polyethylene glycol into the reactor at a weight ratio of 2:1.5, dilute with water to a concentration of 30%, and react at a temperature of 85°C for 4.5 hours to complete the esterification reaction and form β-carbonyl esters;

[0026] B). Add 20% of the total amount of raw material methyl polyoxyethylene ether to the product of A), control the temperature at 65 ° C, stir, and then slowly add 45 g of benzoyl peroxide to the addition reaction, and control the drop Speed, so that it drops within 2 hours, and then control the reaction temperature within the range of 80 ° C, and react for 5 hours to form a polymer compound with a certain molecular weight containing groups such as ether esters;

[0027] C). After the addition reaction in B), add alkali to neutralize and stir to make the pH value of the material 8±0.5, and obtain an ether-ester copolymer high-efficiency water reducer.

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Abstract

The invention discloses a method for preparing an ether ester copolymer high-efficiency water reducer; methyl polyethenoxy ether, methyl methacrylate, polyethylene glycol and the like are taken as raw materials and go through ester condensation reaction, addition reaction and neutralization reaction to prepare the ether ester copolymer high-efficiency water reducer; and the preparation method is simple and the reaction conditions are easy to control. The weight percentages of the raw materials are as follows: 9 percent to 19 percent of methyl polyethenoxy ether, 45 percent to 60 percent of methyl methacrylate, 30 percent to 40 percent of polyethylene glycol; the technology of the preparation method is simple, the reaction is stable, the reaction condition is mild and the technological process is easy to control. The obtained ether ester copolymer high-efficiency water reducer has the advantages of high water reduction rate, good fluidity, high slump retaining ability, good plasticizing effect, low retardation, low shrinkage, high reinforcement and the like, thus meeting the technical requirements and construction requirements of modern high-performance concrete.

Description

technical field [0001] The invention relates to a method for preparing a water reducer, more specifically to a method for preparing an ether-ester copolymer high-efficiency water reducer. Background technique [0002] High-efficiency water reducer is one of the important products in the pillar industry of new building materials. At present, the polycarboxylate-based water reducer is more researched in China. It is a new generation of concrete admixture after the traditional naphthalene-based, sulfamic acid-based, and melamine-based water-reducers. Its molecular structure is designed in the molecular main chain or side. Strong polar groups such as carboxyl group, sulfonic acid group, polyoxyethylene group, etc. are introduced into the chain to make the molecule have a comb structure. There are mainly two types of polyoxyethylene (EO) or polyoxypropylene (PO) branched chains with maleic anhydride as the main chain and (EO) or (PO) branched chains with methacrylic acid as the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/28C04B103/30
CPCC04B2103/302C04B24/32
Inventor 周永辉徐文海周翔
Owner 上饶市天佳新型材料有限公司
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