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Slow release type polycarboxylate water reducer and preparation method thereof

A technology of slow-release polycarboxylic acid and water reducer, which is applied in the field of building materials, can solve the problems of concrete slump loss and other problems, achieve stable product performance, solve the effect of concrete slump loss, and have a good market prospect

Active Publication Date: 2013-07-24
YUEYANG ORIENTAL YUHONG WATERPROOF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects of the prior art, the present invention provides a slow-release polycarboxylate superplasticizer, which can safely and effectively solve the problem of concrete slump loss, and has good application effect and market prospect

Method used

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  • Slow release type polycarboxylate water reducer and preparation method thereof
  • Slow release type polycarboxylate water reducer and preparation method thereof
  • Slow release type polycarboxylate water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Put 120.00 parts of polyoxyethylene ether with a molecular weight of 2400 and 115.71 parts of water into a reaction container, raise the temperature, and stir at a temperature of 65±5°C to completely dissolve the reactants, then add 14.4 parts of acrylic acid dissolved in the container dropwise +8.64 parts of sodium methacrylate+13 parts of methacrylic acid ester+mass percentage is 10.00 parts of mercaptopropionic acid solution of 10% and 60.00 parts of 5% ammonium persulfate solution, and the rate of addition is controlled at 150± After 10 minutes and 180±10 minutes of dripping, keep the temperature at 65±5°C and continue the reaction for 1 hour. Cool down to 60±5°C and add 2.4 parts, then add about 5 parts of 30% sodium hydroxide solution after cooling to adjust pH=6.5±0.5 to obtain the 45% polycarboxylate high-performance concrete superplasticizer of the present invention.

Embodiment 2

[0030] Put 120.00 parts of polyoxyethylene ether with a molecular weight of 2400 and 115.71 parts of water into a reaction container, raise the temperature, and stir at a temperature of 65±5°C to completely dissolve the reactants, then add 14.4 parts of acrylic acid dissolved in the container dropwise +8.64 parts of sodium methacryl sulfonate+10.4 parts of methacrylic acid ester+mass percentage is the aqueous solution of 10.00 parts of mercaptopropionic acid solution of 10% and 60.00 parts of 5% ammonium persulfate solution and, control dropping rate, respectively at 150 After ±10 minutes and 180±10 minutes, the dripping was completed, and the temperature was kept at 65±5°C, and the reaction was continued for 1 hour. Cool down to 60±5°C and add 2.4 parts, then add about 5 parts of 30% sodium hydroxide solution after cooling to adjust pH=6.5±0.5 to obtain the 45% polycarboxylate high-performance concrete superplasticizer of the present invention.

Embodiment 3

[0032] Put 120.00 parts of polyoxyethylene ether with a molecular weight of 2400 and 118.89 parts of water into a reaction container, raise the temperature, and stir at a temperature of 65±5°C to completely dissolve the reactants, then add 14.4 parts of acrylic acid dissolved in the container dropwise +8.64 parts of sodium methacryl sulfonate+15.6 parts of methacrylic acid ester+mass percentage is the aqueous solution of 10.00 parts of mercaptopropionic acid solution and 60.00 parts of 5% ammonium persulfate solution and, control dropping rate, respectively at 150 After ±10 minutes and 180±10 minutes, the dripping was completed, and the temperature was kept at 65±5°C, and the reaction was continued for 1 hour. Cool down to 60±5°C and add 2.4 parts, then add about 5 parts of 30% sodium hydroxide solution after cooling to adjust pH=6.5±0.5 to obtain the 45% polycarboxylate high-performance concrete superplasticizer of the present invention.

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Abstract

The invention discloses a slow release type polycarboxylate water reducer which is polycarboxylate water reducer solution. The slow release type polycarboxylate water reducer comprises polymer water solution and alkaline water solution, wherein the polymer water solution is polymerized by three ingredients: A, water solution of polyoxyethylene ether or polyoxypropylene ether, B, acrylic acid and / or methacrylic acid and / or itaconic acid and / or esters of the three, and C, sodium allylsulfonate and / or sodium methallyl sulfonate; and the alkaline water solution is used for neutralizing the polymer water solution. According to the slow release type polycarboxylate water reducer, low alkali content and excellent slump retentivity are provided, the operation is labor-saving when the water reducer is used for concrete, the cement mixture has high fluidity, high slump protection capability and favorable peaceability, the production process is simple, the reaction condition is easy to control and no environmental pollution is caused.

Description

technical field [0001] The invention relates to a slow-release polycarboxylate water reducer, which belongs to the field of building materials. Background technique [0002] Compared with high-efficiency water reducers such as naphthalene, melamine, and sulfamate, polycarboxylate water reducers have more excellent properties, such as low dosage, high water reducing rate, fresh concrete fluidity and slump retention Good performance, low shrinkage, great strengthening potential, and environmental friendliness have become the direction of development and application of water reducing agents in recent years. Due to many domestic cement varieties and large fluctuations in cement quality, poor quality of concrete sand and gravel (high mud content and stone powder content, and poor quality of some machine-made sand), the general-purpose polycarboxylate superplasticizer is used. The configured concrete will also have some problems, the most important of which is the excessive loss ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C08F283/06C08F2/38C04B103/30
Inventor 杨晓峰王虎群熊卫锋
Owner YUEYANG ORIENTAL YUHONG WATERPROOF TECH
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