High-performance polycarboxylate superplasticizer synthetized by low temperature method, and preparation method thereof

A technology of polycarboxylic acid and water reducing agent, which is applied in the field of low temperature synthesis of high-performance polycarboxylic acid water reducing agent and its preparation, can solve the problems of high energy consumption and achieve the effect of strong adaptability and stable performance

Inactive Publication Date: 2014-02-05
湖南加美乐素新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Polycarboxylate superplasticizer is widely used because of its low dosage and high water-reducing rate. Its synthesis process is also very mature, and various new technologies emerge in endlessly, but most of them are synthesized at relatively high temperature. more energy

Method used

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  • High-performance polycarboxylate superplasticizer synthetized by low temperature method, and preparation method thereof
  • High-performance polycarboxylate superplasticizer synthetized by low temperature method, and preparation method thereof
  • High-performance polycarboxylate superplasticizer synthetized by low temperature method, and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0025] (1) Put 120 parts of methallyl polyoxyethylene ether with a molecular weight of 2400 and some water into a reaction vessel, raise the temperature, stir at a temperature of 30±2°C to completely dissolve the reactants, and add 12 parts of acrylic acid , 3 parts of dimethyl maleic anhydride, 6 parts of sodium methacrylate and 2 parts of hydrogen peroxide, and then dropwise added 50 parts of 5% by mass percentage of scallop solution, and 7.2 parts of 5% by mass of mercapto Propionic acid solution, control the dropping speed, finish dropping at 120±10 minutes, keep the temperature at 30±2°C, and continue to react for 2 hours. After cooling, 9.53 parts by mass of 30% sodium hydroxide solution were added to adjust the pH to 6.5 ± 0.5 to obtain the high-performance polycarboxylate water reducer of the present invention.

Embodiment 2

[0027] Put 120 parts of methallyl polyoxyethylene ether with a molecular weight of 2400 and some water into a reaction vessel, raise the temperature, and stir at a temperature of 30±2°C to completely dissolve the reactants, add 10.8 parts of acrylic acid, 2.2 parts Dimethyl maleic anhydride, 6.3 parts of sodium methacryl sulfonate and 2 parts of hydrogen peroxide, then add dropwise 50 parts of 5% by mass percentages of the white block solution, and 7.2 parts of 5% by mass of mercapto propionic acid solution , control the rate of addition, and finish dropping at 120±10 minutes, keep the temperature at 30±2°C, and continue the reaction for 2 hours. After cooling, 9.53 parts by mass of 30% sodium hydroxide solution were added to adjust the pH to 6.5 ± 0.5 to obtain the high-performance polycarboxylate water reducer of the present invention.

Embodiment 3

[0029] Put 120 parts of methallyl polyoxyethylene ether with a molecular weight of 2400 and some water into a reaction vessel, stir at a temperature of 20±2°C to completely dissolve the reactants, add 8 parts of acrylic acid, 3 parts of maleic acid Anhydride dimethyl ester, 7 parts of sodium methacryl sulfonate and 2 parts of hydrogen peroxide, then add dropwise 50 parts of 5% by mass percentage of the white block solution, and 7.2 parts of 5% by mass of mercapto propionic acid solution, control The dropping speed is finished at 120±10 minutes, and the temperature is kept at 20±2°C, and the reaction is continued for 2 hours. After cooling, 9.53 parts by mass of 30% sodium hydroxide solution were added to adjust the pH to 6.5 ± 0.5 to obtain the high-performance polycarboxylate water reducer of the present invention.

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Abstract

The invention relates to a high-performance polycarboxylate superplasticizer synthetized by a low temperature method, and a preparation method thereof. The high-performance polycarboxylate superplasticizer is in a liquid state; the solid content of the high-performance polycarboxylate superplasticizer is 40%; the high-performance polycarboxylate superplasticizer is the polycarboxylate superplasticizer which contains a sulfo group, an ester group, carboxyl, and a methyl allyl polyethenoxy ether side chain and is prepared from methyl allyl polyethenoxy ether, and monomers such as acrylic acid, dimethyl maleic anhydride and sodium methallyl sulfonate by sequentially carrying out polymerization and neutralization under the effects of a molecular chain initiator and a chain transfer agent. The high-performance polycarboxylate superplasticizer disclosed by the invention is low in alkali content, high in water-reducing rate and simple in production technology, and reaction conditions are easy to control; normal-temperature production, and energy conservation and consumption reduction are achieved; the environmental pollution is not generated.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, and in particular relates to a high-performance polycarboxylate water reducer synthesized by a low-temperature method and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer is widely used because of its low dosage and high water-reducing rate. Its synthesis process is also very mature, and various new technologies emerge in endlessly, but most of them are synthesized at relatively high temperature. energy is greater. Through the selection of a suitable initiation system, the author synthesized the synthesis process of polycarboxylate high-performance water reducer under normal temperature conditions. This process overcomes the characteristics of slow temperature rise in winter and slow temperature drop in summer, which simplifies the production process and reduces equipment. It saves energy consumption, reduces the loss of production equipment, improve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C08F283/06C08F220/06C08F222/14C08F228/02C08F4/40C04B103/30
Inventor 廖声金王伟胡铁刚
Owner 湖南加美乐素新材料股份有限公司
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