Liquid anti-segregation agent and preparation method thereof

An anti-segregation agent and liquid technology, applied in the field of concrete admixtures, can solve the problems of increased concrete water consumption and slurry-bone ratio, high cohesion performance, and fast concrete settling speed, achieving excellent dispersion performance and reducing surface tension , the effect of excellent salt resistance performance

Inactive Publication Date: 2019-11-08
CHONGQING SANSHENG IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the fluidity and cohesion of concrete are often contradictory, that is, it is difficult for concrete to maintain high cohesion in a large flow state.
In this way, the pursuit of high fluidity is prone to bleeding and segregation
In addition, the quality of aggregates in our country is getting worse and worse, the void ratio of sand and gravel is getting bigger and bigger, natural sand is almost exhausted, and the content of particles with a particle size above 4.75mm in machine-made sand is high. In this case, due to the large fluidity of concrete Demand will inevitably lead to an increase in water consumption and slurry-bone ratio in concrete
The fluctuation of ...

Method used

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  • Liquid anti-segregation agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Weigh 5.34g of N,N-dimethylacrylamide and dissolve it in 15g of deionized water, stir well to obtain solution B for use; weigh 2.23g of tristyrylphenol polyoxyethylene ether methacrylate and dissolve it in 10g of deionized In water, stir evenly to obtain solution C for use; weigh 0.4g mercaptoethanol and 0.74gVC to dissolve in 40g deionized water, stir evenly to obtain a chain transfer agent solution for use; weigh 42.43g 2-acrylamide-2-methyl Add propanesulfonic acid and 150g deionized water into the reaction vessel and heat to dissolve. After the temperature reaches 50°C, add 3g of 30wt% hydrogen peroxide solution and keep stirring for 5min. After dropping for h, continue to keep warm for 2 hours. After the reaction, add aqueous sodium hydroxide solution to adjust the pH value of the system to 7.8, and then discharge the product to obtain the product.

Embodiment 2

[0042] Weigh 5.34g of acrylamide and dissolve it in 15g of deionized water, stir evenly to obtain solution B for use; weigh 4.47g of tristyrylphenol polyoxyethylene ether methacrylate and dissolve it in 10g of deionized water, stir evenly to obtain Solution C is ready for use; weigh 0.4g of mercaptoethanol and 0.74g of VC and dissolve it in 20g of deionized water, stir evenly to obtain a chain transfer agent solution for use; put 40.19g of sodium methacrylate and 150g of deionized water into the reaction vessel Heat to dissolve, and when the temperature reaches 50°C, add 1.06g of 30wt% hydrogen peroxide solution and keep stirring for 5 minutes, then start to add solution B, solution C and chain transfer agent solution dropwise at a constant speed, and finish dropping in 3.5 hours, then continue to keep warm for 2 hours, and then After the completion, add sodium hydroxide aqueous solution to adjust the pH value of the system to 7, and then discharge the product to obtain the pro...

Embodiment 3

[0044] Weigh 2.67g of N,N-dimethylacrylamide and dissolve it in 10g of deionized water, stir well to obtain solution B for use; weigh 2.67g of long-chain alkyl alcohol polyoxyethylene ether methacrylate and dissolve it in 15g of deionized In water, stir evenly to obtain solution C for use; dissolve 0.2g mercaptoethanol and 0.74gVC in 40g deionized water, stir evenly to obtain a chain transfer agent solution for use; Put the acid and 150g deionized water into the reaction vessel and heat to dissolve. After the temperature reaches 50°C, add 2.12g of 30wt% hydrogen peroxide solution and keep stirring for 5min, then start to add solution B, solution C and chain transfer agent solution dropwise at a constant speed for 3.5h After dropping, continue to keep warm for 2 hours. After the reaction, add sodium hydroxide aqueous solution to adjust the pH value of the system to 6.4, and discharge the product to obtain the product.

[0045] The application test results of the anti-segregatio...

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PUM

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Abstract

The invention provides a liquid anti-segregation agent, which comprises: 40-50 weight parts of a monomer A, 2-6 weight parts of a monomer B, 0.1-1 weight part of a chain transfer agent, 1-5 weight parts of an initiator, and 150-200 weight parts of water. Specifically, the monomer A is any one of or a mixture of several of 2-acrylamide-2-methylpropanesulfonic acid, methylallyl polyoxyethylene ether, sodium methallyl sulfonate and sodium allyl sulfonate, the monomer B is any one of or a mixture of several of N, N-dimethacrylamide, acrylamide, N-hydroxymethyl acrylamide, acrylic acid and methacrylic acid, the initiator is a 30wt% hydrogen peroxide aqueous solution and ascorbic acid, and the chain transfer agent is mercaptoethanol. The liquid anti-segregation agent provided by the invention has the function of reducing the surface tension of concrete while having water retaining capacity, and can maintain the viscosity and fluidity of concrete.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to a liquid anti-segregation agent and a preparation method thereof. Background technique [0002] As the largest building material, concrete has developed by leaps and bounds. In recent years, high-strength and high-performance concrete has been widely used in engineering. [0003] However, the fluidity and cohesion of concrete are often contradictory, that is, it is difficult for concrete to maintain high cohesion in a large fluid state. In this way, the pursuit of high fluidity is prone to bleeding and segregation. In addition, the quality of aggregates in our country is getting worse and worse, the void ratio of sand and gravel is getting bigger and bigger, natural sand is almost exhausted, and the content of particles with a particle size above 4.75mm in machine-made sand is high. In this case, due to the large fluidity of concrete Demand will inevitably lead to an increase...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/54C08F220/58C08F220/56C08F228/02C08F220/06C04B24/16C04B103/46
CPCC04B24/165C04B2103/46C08F283/065C08F220/54C08F220/56C08F228/02C08F220/58C08F220/06
Inventor 潘先文郑敏李光明
Owner CHONGQING SANSHENG IND CO LTD
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