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Water-reducing agent with strong adaptability to concrete aggregate and preparation method and application method of water-reducing agent

A technology of water reducing agent and sand and gravel material, which is applied in the field of water reducing agent and its preparation, can solve the problems of unable to meet the needs of stable concrete quality, inability to guarantee the quality of sand and gravel material, troublesome operation, etc., and achieve enhanced water reducing effect and good maintenance Sexuality, the effect of short production time

Active Publication Date: 2014-05-14
SHANXI SUNWAY INTION TRADE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the supply of sand and gravel used in concrete is relatively tight, and the quality of sand and gravel in practical applications cannot be guaranteed. Ordinary polycarboxylate superplasticizers that are sensitive to the mud content and powder content of sand and gravel cannot meet the current stable quality of concrete. need
[0003] In the patent CN102093519, it is disclosed that a preparation method of an anti-mud type polycarboxylic acid superplasticizer needs to adopt high-temperature esterification reaction and polymerization reaction. After the two reactions are completed, a copolymerization reaction is required. This method needs to undergo three reactions. Complete, this method has the problems of low conversion rate, troublesome operation, and the use of explosive and flammable dangerous goods cyclohexane in the esterification process, which has unsafe factors, and the process of preparing this polycarboxylate water reducer can be greatly simplified

Method used

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  • Water-reducing agent with strong adaptability to concrete aggregate and preparation method and application method of water-reducing agent
  • Water-reducing agent with strong adaptability to concrete aggregate and preparation method and application method of water-reducing agent
  • Water-reducing agent with strong adaptability to concrete aggregate and preparation method and application method of water-reducing agent

Examples

Experimental program
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Effect test

example 1

[0014] Example 1, in a four-necked flask equipped with a thermometer and a stirring paddle, add 80 g of water, then add 29.4 g of maleic anhydride, open the stirring device, start to increase the temperature of the reaction system at this time, and wait for the maleic anhydride to complete after stirring for 15 minutes. Dissolve, add methacryl polyoxyethylene ether (TPEG for short, molecular weight 2400) 240g, methyl acrylate 51.6g, raise the temperature of the reaction system to 70-75°C, after the reaction temperature reaches 70°C, add 20g mass fraction 20% hydrogen peroxide, stirred for 20 minutes, then added 8g of thioglycolic acid, continued to keep the temperature of the reaction system at 70-75°C, and closed the reaction for 3 hours. After the reaction was completed, the temperature was lowered to 42°C, and 45g of 30% sodium hydroxide solution was added , adjust the pH of the solution to 6-7, add 392g of water to adjust the mass fraction of the solution to 40% product 1. ...

example 2

[0015] Example 2, in a four-necked flask equipped with a thermometer and a stirring paddle, add 80 g of water, then add 29.4 g of maleic anhydride, open the stirring device, start to increase the temperature of the reaction system at this time, and wait for the maleic anhydride to complete after stirring for 15 minutes. Dissolve, add 120g of methacryl polyoxyethylene ether (TPEG for short, molecular weight: 1200), 51.6g of methyl acrylate, raise the temperature of the reaction system to 75°C, add 10g of hydrogen peroxide with a mass fraction of 20%, and stir for 20min. Then add 5g of mercaptoacetic acid, continue to keep the temperature of the reaction system at 70-75°C, and conduct a closed reaction for 3 hours. After the reaction is completed, cool down to 40°C, add 40g of 30% sodium hydroxide solution, and adjust the pH of the solution to 6-7 , adding 214g of water to adjust the mass fraction of the solution to be 40% product 2.

example 3

[0016] Example 3, in a four-neck flask equipped with a thermometer and a stirring paddle, add 80 g of water, then add 49 g of maleic anhydride, turn on the stirring device, start to increase the temperature of the reaction system, and wait for the complete dissolution of maleic anhydride after stirring for 15 minutes , add methacryl polyoxyethylene ether (TPEG for short, molecular weight 2400) 240g, methyl acrylate 25.8g, after raising the temperature of the reaction system to 80°C, add 20g of hydrogen peroxide with a mass fraction of 20%, stir for 20min, then Add 10g of mercaptoacetic acid, continue to keep the temperature of the reaction system at 75-80°C, and conduct a closed reaction for 3 hours. After the reaction is completed, cool down to 40°C, add 40g of 30% sodium hydroxide solution, and adjust the pH of the solution to 6-7. Add 387.2g of water to adjust the mass fraction of the solution to be 40% product 3.

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Abstract

The invention relates to a polycarboxylic acid water-reducing agent with strong adaptability to a concrete aggregate and a preparation method and an application method of the water-reducing agent. Copolymerization is performed by taking maleic anhydride, methyl propenyle polyoxyethylene ether and acrylic acid methyl ester as raw materials to prepare the polycarboxylic acid water-reducing agent with strong adaptability to the concrete aggregate. The process is simple in operation, is high in water-reducing rate and is lower in cost. The adaptability of the polycarboxylic acid water-reducing agent to the concrete aggregate is strong, and very good retentivity is performed on concrete slump. Moreover, the strength of concrete can be effectively increased. Verified by a large number of experiments, the product can be used for eliminating the influences brought to the workability and the strength of the concrete because the silt content and the powder content of the concrete aggregate are high.

Description

technical field [0001] The invention relates to the technical field of synthetic concrete admixtures, in particular to a water reducer with strong adaptability to concrete sand and gravel materials and its preparation method and use method. Background technique [0002] Admixture is an indispensable fifth component of concrete and its products, and is crucial to the stability of concrete quality. With the development of modern concrete technology in the direction of high strength, green and high performance, higher and more comprehensive requirements are put forward for concrete admixtures. Additives at home and abroad have gone through the development process from the first generation of lignin, to the second generation of naphthalene sulfonate, sulfonated melamine, sulfamate, and then gradually to the third generation of polycarboxylic acid system, but in practice In the application, the concrete sand and gravel have a great influence on the concrete admixture. Now the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F290/06C08F222/06C08F220/14C04B24/26C04B103/30
Inventor 杨思忠郑付营陈峰刘波沣刘奎启
Owner SHANXI SUNWAY INTION TRADE CO LTD