Polycarboxylic superplasticizer and application thereof

A technology of superplasticizer and polycarboxylic acid, which is applied in the field of polycarboxylic acid cement concrete dispersant, can solve the problems of increasing concrete cost, reducing concrete flow capacity, reducing the effect, etc., and reducing the impact of sulfate ions on it. Effect, slump loss good, slump loss mitigation effect

Active Publication Date: 2013-03-20
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These polymer molecules are adsorbed on the surface of cement particles through ionic bonds. Once adsorbed, they cannot be separated from the surface, and are gradually buried with the gradual generation of cement hydration products, so that the dispersion ability of polycarboxylate superplasticizer gradually increases. Loss, resulting in the reduction of concrete flow capacity, resulting in obvious loss of concrete slump
[0005] Conventional polycarboxylate dispersant can provide good dispersing ability due to its strong adsorption ability, but at the same time, it will inevitably cause insufficient number of remaining superplasticizer molecules in the concrete system, resulting in insufficient slump retention

Method used

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  • Polycarboxylic superplasticizer and application thereof
  • Polycarboxylic superplasticizer and application thereof
  • Polycarboxylic superplasticizer and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] In a glass reactor equipped with a thermometer, a stirrer, a dropping funnel, and a nitrogen inlet tube, add 250 g of deionized water and 400 g of B-1 (0.08 mol) at the same time, purging the reaction vessel with nitrogen while stirring, and raising the temperature Dissolve at 30°C, then add 10 g of hydrogen peroxide (mass concentration: 30%), and stir evenly. Then 155.2g A-1 (0.8mol), 1.6g mercaptoacetic acid, 1.84g 2-mercaptopropionic acid, and 70g of water are mixed, stirred to make a uniform monomer aqueous solution, which is added dropwise to the reactor, and the dropwise addition time is 2h, and at the same time, add 40g of aqueous solution containing 7g of L-ascorbic acid dropwise, and the dropping time is about 2h. After the dropwise addition, keep warm for 2h, then add 10g of aqueous solution containing 0.7g of L-ascorbic acid to the reaction bottle, and continue to keep warm for 1h , cooled to room temperature, and neutralized to pH 7.0 by adding alkali to obt...

Embodiment 2

[0044] In a glass reactor equipped with a thermometer, a stirrer, a dropping funnel, and a nitrogen inlet tube, add 400 g of deionized water and 240 g of B-2 (0.1 mol) at the same time, purging the reaction vessel with nitrogen while stirring, and raising the temperature Dissolve at 60°C, then add 0.4 g of hydrogen peroxide (mass concentration: 30%), and stir evenly. Then mix 48.5gA-1 (0.25mol), 0.74g 3-mercaptopropionic acid, and 100g water, stir to form a uniform monomer aqueous solution, and drop it into the reactor for 4 hours. 100g of an aqueous solution containing 0.225g of L-ascorbic acid was added for about 4 hours. After the addition, the reaction was incubated for 2 hours, and then 10 g of an aqueous solution containing 0.025g of L-ascorbic acid was added to the reaction bottle, and the temperature was continued for 1 hour, and cooled to room temperature. Add alkali to neutralize to pH 6.8 to obtain a light yellow transparent liquid with a solid content of 31.4% and ...

Embodiment 3

[0046] In the glass reactor equipped with thermometer, stirrer, dropping funnel and nitrogen gas introduction tube, add 440g deionized water, add 360g B-2 (0.15mol) at the same time, purging reaction vessel with nitrogen while stirring, and heat up Dissolve at 70°C, then add 4.08g of hydrogen peroxide (mass concentration: 30%), and stir evenly. Then 156g of A-2 (0.75mol), 0.96g of 2-mercaptopropionic acid, and 200g of water were mixed, stirred to form a uniform monomer aqueous solution, which was added dropwise to the reactor for 6 hours, and 100g of The aqueous solution containing 3.76g sodium formaldehyde sulfoxylate, the time of dropping is about 6h, after the dropwise addition is completed, keep warm for 2h, then add 10g aqueous solution containing 0.4g sodium formaldehyde sulfoxylate to the reaction bottle, and continue to keep warm for 1h, cool Bring to room temperature, add alkali to neutralize to pH 7.5, and obtain a light yellow transparent liquid with a solid content...

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Abstract

The invention relates to a polycarboxylic superplasticizer. The polycarboxylic superplasticizer is prepared by copolymerizing a monomer A and a monomer B in the aqueous solution in the presence of a redox initiator and a chain transfer agent, wherein the molar ratio of the monomer A to the monomer B is 2 to 10: 1. The polycarboxylic superplasticizer is high in dispersing performance under lower amount of admixture, high in slump holding capacity and high in material adaptability, and can effectively avoid the shortcoming that common polycarboxylic superplasticizer is insufficient in slump holding capacity, so that the shortcomings that extra special slump holding agents for improving the concrete slump holding capacity are added and result in reduction of dispersion, reduction of economy and more difficulty in construction can be avoided.

Description

technical field [0001] The invention relates to a polycarboxylate cement concrete dispersant which has molecular structure activity in cement alkaline environment and thus has double-layer action driving force, and belongs to the technical field of concrete admixtures. Background technique [0002] In recent years, with the construction of large-scale infrastructure in the country, a series of major projects including large bridges, nuclear power, hydropower, super high-rise buildings and other major projects have put forward higher requirements for concrete, especially the construction time of high-performance concrete is increasing. Therefore, the fluidity retention ability of high performance concrete is particularly important. In addition, due to regional factors in China, there are large differences in the quality of building materials in different regions, and the quality of sand aggregates in the same region also fluctuates to a certain extent. These factors will cau...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F283/06C08F220/38C08F4/40C08F2/38C04B103/30
Inventor 周栋梁冉千平刘加平杨勇刘金芝
Owner JIANGSU SOBUTE NEW MATERIALS
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