Synthesis method of polycarboxylic efficient concrete water reducer for high-performance prefabricated parts

A high-efficiency water-reducing agent and polycarboxylic acid-based technology, which is applied in the field of high-molecular polycarboxylic acid addition-copolymerization type high-efficiency water-reducing agent and its synthesis, can solve the problems of inability to meet high-performance prefabricated components, and achieve significant economic benefits and social benefits, good apparent quality and stable performance

Active Publication Date: 2012-11-21
SHANGHAI SHENLI BUILDING MATERIAL +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis method is a two-step method. First, esterification is carried out, and then graft copolymerization is carried out. Due to the molecular struct

Method used

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  • Synthesis method of polycarboxylic efficient concrete water reducer for high-performance prefabricated parts
  • Synthesis method of polycarboxylic efficient concrete water reducer for high-performance prefabricated parts
  • Synthesis method of polycarboxylic efficient concrete water reducer for high-performance prefabricated parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In a 1000ml flask equipped with a thermometer and a stirrer, first add 200g of pure water, when the temperature rises to 50-60°C, add 375g of methyl alkenyl polyoxyethylene ether polyoxypropylene ether and 3g of hydrogen peroxide, heat up and stir to 60-60°C At 65°C, add solution A (0.5g ascorbic acid + 1g thioglycolic acid + 100-150g water) and solution B (30g acrylic acid + 5g 2-acrylamide-2 methylpropanesulfonic acid + 10- 20g); the time for adding liquid A is 4-4.5 hours, and the time for adding liquid B is 3.5-4 hours. After the dropwise addition, keep warm for 1-3 hours to make the reaction complete. After cooling, neutralize with sodium hydroxide to pH=5.5±0.5, add water to adjust to the specified concentration, and obtain a colorless transparent viscous liquid with a solid content of about 40%. , to adjust the air content.

[0022] It is measured that when the dosage is 0.5% of the cement mass, the fluidity of the slurry is more than 200mm, and the concrete wat...

Embodiment 2

[0024] In a 1000ml flask equipped with a thermometer and agitator, first add 200g of pure water, when the temperature rises to 50-60°C, add 375g of methyl alkenyl polyoxyethylene ether polypropylene ether and 3g of hydrogen peroxide, heat up and stir to 60-65°C At ℃, use a constant pressure dropping funnel to add solution A (1g ascorbic acid + 1.5g thioglycolic acid + 100-150g water) and solution B (30g acrylic acid + 5g 2-acrylamide-2 methylpropanesulfonic acid + 10-20g water) ); the time for adding liquid A is 4-4.5 hours, and the time for adding liquid B is 3.5-4 hours for 2-acrylamido-2 methylpropanesulfonic acid. After the dropwise addition, keep warm for 1-3 hours to make the reaction complete. After cooling, neutralize with sodium hydroxide to pH=5.5±0.5, add water to adjust to the specified concentration, and obtain a colorless transparent viscous liquid with a solid content of about 40%. , to adjust the air content.

[0025] When the measured mixing amount is 0.5% of...

Embodiment 3

[0027] In a 1000ml flask equipped with a thermometer and agitator, first add 200g of pure water, when the temperature rises to 50-60°C, add 375g of methyl alkenyl polyoxyethylene ether polypropylene ether and 3g of hydrogen peroxide, heat up and stir to 60-65°C At ℃, use a constant pressure dropping funnel to add solution A (1g ascorbic acid + 2g thioglycolic acid + 100-150g water) and solution B (30g acrylic acid + 5g 2-acrylamide-2 methylpropanesulfonic acid + 10-20g water) ; Control the time of adding liquid A to be 4-4.5 hours, and the time of adding liquid B to be 3.5-4 hours. After the dropwise addition, keep warm for 1-3 hours to make the reaction complete. After cooling, neutralize with sodium hydroxide to pH=5.5±0.5, add water to adjust to the specified concentration, and obtain a colorless transparent viscous liquid with a solid content of about 40%. , to adjust the air content.

[0028] When the measured mixing amount is 0.5% of the cement mass, the fluidity of the...

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Abstract

The invention relates to polycarboxylic efficient concrete water reducer for high-performance prefabricated parts and a synthesis method thereof. The polycarboxylic efficient concrete water reducer in a comb structure is characterized by being formed by using TPEG 2400 (methyl alkenyl polyoxyethylene ether), unsaturated crylic acid and activated monomer AMPS (2-acrylamide 2- methylpro panesulfonic acid), and using a redox system (hydrogen peroxide-VC (ascorbic acid)) for one-step mid-temperature aqueous free radical polymerization. The polycarboxylic efficient concrete water reducer is provided with active groups such as ether bonds, carboxylic acid groups, sulfonic acid groups, polyoxyethylene alkyl ethers and amide groups on long main chains and side chains. The product with 40% solid content has the effects of high water reducing rate, high early strength, low gas content, low chlorine, low alkali and no rusting to reinforcement steel bars. The product is prepared into the product with 20% solid content for use. After 1.0-1.2% of cementing material is added, the product has fine wrapping performance and water retentivity when slump is 30-50mm. The product can be used for concrete for high-performance prefabricated parts, such as C80 high-strength tubular piles and C60 prefabricated beams.

Description

technical field [0001] The invention relates to a high-efficiency polycarboxylate concrete superplasticizer and a synthesis method thereof, in particular to a high-molecular polycarboxylate addition copolymerization type high-efficiency water reducer suitable for high-performance prefabricated components and a synthesis method thereof. Background technique [0002] High-performance prefabricated components are a kind of high-strength concrete products that have developed rapidly in recent years and are widely used, such as C60 and C80 prestressed high-strength concrete pipe piles, which have good pile quality, fast construction, strong adaptability to engineering geology, and civilized construction sites. It has been widely used in the basic engineering of various buildings and structures due to its advantages such as cleaning. The development of prefabricated high-strength and high-performance prefabricated U-shaped beams for rail transit has a large bearing capacity and re...

Claims

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Application Information

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IPC IPC(8): C04B24/16C04B103/30
Inventor 吴菊珍吴杰曹炳根冯为民朱敏涛王强金川屠洁梅
Owner SHANGHAI SHENLI BUILDING MATERIAL
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