Carboxylic acid copolymer concrete slump retaining agent

A kind of copolymer and concrete technology, applied in the field of carboxylic acid copolymer concrete slump retaining agent, can solve the problems of excessive mixing of concrete admixtures, affecting the construction progress and project quality, affecting the quality of concrete, etc., so as to solve the problems of slump loss, The effect of prolonging the coagulation time and lowering the reaction temperature

Inactive Publication Date: 2010-09-15
深圳市五山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

[0005] 1. A large number of retarding components are used, but due to the excessive use of retarders, the concrete setting time is often too long, which affects the construction progress and project quality
Especially due to excessive retardation, if moisture protection measures are not taken in time, the concrete surface is easy to crack
[0006] 2. Secondary addition of water reducing agent (adding water reducing agent after the com

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0035] First add 186g of demineralized water, 360g of modified polyether, and 9.8g of crosslinking agent to the reaction kettle until the material is completely dissolved to a transparent state. When the temperature reaches 60°C-62°C, add 22.5g of hydrogen peroxide solution and stir for 2-3 minutes before dripping Add liquid A and liquid B, wherein liquid A is composed of 116g of demineralized water, 0.76g of mercaptopropionic acid and 0.84g of ascorbic acid; liquid B is composed of 20g of acrylic acid and 5g of demineralized water. The dropwise reaction temperature is 60°C-65°C; the hydrogen peroxide solution is prepared by mixing 1.9g of 30% hydrogen peroxide and 20.6g of demineralized water. Solution A drops in 3.5 hours, and solution B drops in 3 hours. After liquid A and liquid B are dropped, keep warm and react for one hour. Cool down to 45°C, add 24g of 30% liquid caustic soda and adjust the concentration to 45% pH value of 6.0-7.0 with demineralized water with a hardn...

example 2

[0037]First add 186g of demineralized water, 360g of modified polyether, and 19g of cross-linking agent to the reaction kettle until the material is completely dissolved to a transparent state. When the temperature reaches 60°C-62°C, add 22.5g of hydrogen peroxide solution and stir for 2-3 minutes. Add solution A and solution B dropwise, wherein solution A is composed of 116g of demineralized water, 0.76g of thioglycolic acid and 0.84g of ascorbic acid, and solution B is composed of 20g of acrylic acid and 5g of demineralized water. Dropping reaction temperature is 60°C-65°C. Solution A is dropped in 3.5 hours, and solution B is dropped in 3 hours. After liquid A and liquid B are dropped, keep warm and react for one hour. Cool down to 45°C, add 24g of 30% liquid caustic soda and adjust the concentration to 45% pH value 6.0-7.0 with demineralized water. The hydrogen peroxide solution is formed by mixing 1.9 g of 30% hydrogen peroxide and 20.6 g of demineralized water.

example 3

[0039] First add 186g of demineralized water, 360g of modified polyether, and 28.5g of crosslinking agent to the reaction kettle until the material is completely dissolved to a transparent state. When the temperature reaches 60°C-62°C, add 22.6g of hydrogen peroxide solution and stir for 2-3 minutes before starting Add liquid A and liquid B dropwise at the same time, wherein liquid A is composed of 116 g of demineralized water, 0.76 g of thioglycolic acid and 0.84 g of ascorbic acid, and liquid B is composed of 20 g of acrylic acid and 5 g of demineralized water. Dropping reaction temperature is 60°C-65°C. Solution A is dropped in 3.5 hours, and solution B is dropped in 3 hours. After A and B drops, keep warm for one hour. Cool down to 45°C, add 24g of 30% liquid caustic soda and adjust the concentration to 45% pH value 6.0-7.0 with demineralized water.

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PUM

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Abstract

The invention discloses a carboxylic acid copolymer concrete slump retaining agent. The slump retaining agent is a copolymer which has the molecular weight of between 10,000 and 100,000 and is synthesized by using modified polyester, unsaturated carboxylic acid and cross-linking agent and by adopting a redox system and an initiator; 30 percent liquid alkali is added into the copolymer at the temperature of 45 DEG C to neutralize the copolymer and the concentration of the neutralized solution is diluted to 45 percent by softened water, and the pH value of the mixed solution is controlled to be between 6.0 and 7.0. Compared with the prior art, the slump retaining agent is directly prepared by polymerization which is performed by using the modified polyester, the unsaturated carboxylic acid and the cross-linking agent and by adopting the redox system and the water soluble initiator, activated macro-monomers of esters are not required to be prepared, the process is simple and the reaction temperature is low. The slump retaining agent has a good plastic retaining effect on middle and low slump concrete or high slump concrete and does not prolong the setting time of the concrete. Meanwhile, the cross-linking agent contained in the structure has a slow-release effect under the action of a strongly alkaline cement environment and slowly releases dispersive low-molecular polymers, so the problem of slump loss of the concrete is effectively solved.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, in particular to a carboxylic acid copolymer concrete slump-retaining agent compounded with a polycarboxylic acid-based high-performance water reducer. Background technique [0002] With the rapid development of national infrastructure, especially the construction of high-speed railways in the next ten years, all require the use of high-performance concrete, and admixtures are not required to use traditional polycondensation products, such as naphthalene-based high-efficiency water reducers, melamine-based water reducers, Sulfamic acid-based water reducer. In order to meet the high durability requirements of high-performance concrete, the admixture requires the use of polycarboxylate-based high-performance water-reducers. Due to the late start of polycarboxylate water-reducers in my country, polycarboxylate water-reducers are widely available in the market The problem of large concrete slump lo...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08G65/28C04B24/26
Inventor 竹国斌丁联合
Owner 深圳市五山新材料股份有限公司
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