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Slow release slump retaining polycarboxylate water reducer and preparation thereof

A water-reducing agent and slump-preserving technology, which is applied in the field of slow-release slump-preserving polycarboxylate water-reducing agent and its preparation field, can solve the problem of high content of water-reducing agent, improve the performance of water-reducing agent, and solve the problem of slump reduction. Excessive loss of degree and the effect of long-lasting slump retention

Inactive Publication Date: 2012-06-27
SHANGHAI JUTONG IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of water reducer has excellent adaptability to the fluctuation of the quality of concrete raw materials, but the amount of water reducer used in concrete is relatively high

Method used

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  • Slow release slump retaining polycarboxylate water reducer and preparation thereof
  • Slow release slump retaining polycarboxylate water reducer and preparation thereof
  • Slow release slump retaining polycarboxylate water reducer and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment one: 50g methallyl polyglycol ether, 3.75g acrylic acid, 1.79g methyl acrylate, 0.15g ethylene glycol dimethacrylate, 0.39g ammonium persulfate, 0.20g mercaptopropionic acid, 83.30g deionized Add water into the four-neck bottle, heat it in a water bath to 85°C, react for 3 hours, cool down to 40°C, adjust the pH value to neutral with 20% sodium hydroxide, and obtain a slow-release solution with a solid content of 40%. Slump retaining polycarboxylate superplasticizer.

Embodiment 2

[0034] Embodiment two: Add 50 g of methallyl polyglycol ether and 33.30 g of deionized water into a four-necked bottle, and heat in a water bath. Mix 3.75g of acrylic acid, 0.15g of triethylene glycol dimethacrylate and 1.79g of methyl acrylate, add 0.39g of ammonium persulfate and 0.20g of mercaptopropionic acid into 50g of deionized water to form a solution. When the temperature is heated to 85°C, add the above two mixtures dropwise for 3 hours. After the dropwise addition, keep the temperature for 2 hours, cool down to 40°C, and adjust the pH with 20% sodium hydroxide. Value to neutral, to obtain a solid content of 40% slow-release slump-proof polycarboxylate superplasticizer.

Embodiment 3

[0035] Embodiment three: 50g methallyl polyglycol ether, 3.75g acrylic acid, 2.08g ethyl acrylate, 0.15g ethylene glycol dimethacrylate, 0.39g ammonium persulfate, 0.20g mercaptopropionic acid, 83.70g deionized Add water into the four-neck bottle, heat it in a water bath to 85°C, react for 3 hours, cool down to 40°C, adjust the pH value to neutral with 20% sodium hydroxide, and obtain a slow-release solution with a solid content of 40%. Slump retaining polycarboxylate superplasticizer.

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Abstract

The invention relates to a slow release slump retaining polycarboxylate water reducer and a preparation method thereof. The method comprises the specific steps of: carrying out ration on unsaturated polyoxyethylene ether, acrylic acid, acrylic acid ester monomers, crosslinking monomer, initiator, chain transferring agent and water for 4-7 h at a reaction temperature of 80-90 DEG C; cooling to 35-40 DEG C; adjusting a pH value of the solution to neutral to obtain a colorless and transparent solution, namely the slow release slump retaining polycarboxylate water reducer. The water reducer prepared by the invention employs two modes of hydrolysis and maintains functions in a cement system for a long time through hydrolysis of ester group on polyacrylic acid monomers and ester group on crosslinking monomer, so as to realize control of slump loss. The slow release slump retaining polycarboxylate water reducer can obviously increase net paste fluidity after one hour, has good retentivity on net paste fluidity after two hours and can maintain nearly zero loss on slump after one hour.

Description

technical field [0001] The invention relates to a slow-release slump-preserving polycarboxylate water reducer and a preparation method thereof. Background technique [0002] The current concrete is developing in the direction of high performance and multifunctionality, which requires concrete to have high workability, high strength, high durability, and can meet the application in many special situations. [0003] For the ready-mix concrete industry, when the concrete mix has to be transported for a long time, the initial slump level should be maintained as much as possible. The more commonly used method to solve the excessive loss of concrete slump is to use a water reducing agent and a retarder in combination. Through the retardation effect of the retarder on the cement hydration, the hydration rate of the cement can be slowed down and more water can be retained. Moisture lubricates solid particles to reduce fluidity loss of fresh cement paste and concrete. In order to p...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F290/06C04B103/30
Inventor 俞成丙吕霞芮英宇戚文迎李梦秋
Owner SHANGHAI JUTONG IND
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