Concrete water reducing agent of polyacrylic acid and its synthesis process

A concrete water-reducing agent and a polyacrylic acid-based technology, which are applied in the field of polyacrylic-based high-efficiency water-reducing agent and synthesis technology, can solve the problems of complex production process of water-reducing agent and high equipment requirements, and achieve good appearance quality and anti-segregation performance. Good, no bleeding line effect

Inactive Publication Date: 2005-07-13
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] From the above three patents, it can be seen that the production process of wat

Method used

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  • Concrete water reducing agent of polyacrylic acid and its synthesis process
  • Concrete water reducing agent of polyacrylic acid and its synthesis process
  • Concrete water reducing agent of polyacrylic acid and its synthesis process

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0051] Example 1: Take the best ratio

[0052] Put 40.00 g of polyethylene glycol with a molecular weight of 400, 8.4 g of acrylic acid, 0.25 g of hydroquinone, 1.5 g of p-toluenesulfonic acid and 200 g of cyclohexane into the reaction vessel, stir at 60°C, and wait for the p-benzene After the diphenol and p-toluenesulfonic acid were completely dissolved, the temperature was kept at 80~90℃ to react for 8 hours, and then filtered and vacuumized to remove the cyclohexane to obtain polyethylene glycol monoacrylate; 54.41g of water was added to the three-necked flask and The temperature is controlled at 85±5°C, then 46.80g of the first esterification product, 14g of acrylic acid and 9.16g of sodium 2-acrylamide-2-methacrylic acid sulfonate are added, 54.41g of water is added to dissolve and mix until dripping. 54.41g dissolved 1.19g of ammonium persulfate and 1.62g of mercaptoethanol, and the three were added dropwise to a three-necked flask at a controlled rate so that the dripping w...

Example Embodiment

[0053] Example 2:

[0054] Put 40.00g of polyethylene glycol with a molecular weight of 400, 10.5g of acrylic acid, 0.26g of hydroquinone, 2.65g of p-toluenesulfonic acid and 210g of cyclohexane into the reaction vessel, stir at 60℃, and wait for the benzene After the bisphenol and p-toluenesulfonic acid were completely dissolved, the temperature was kept at 80-90℃ to react for 8 hours, then filtered, and the cyclohexane was removed by vacuum to obtain polyethylene glycol monoacrylate; 55.84g of water was added to the three-necked flask and The temperature is controlled at 85±5℃, then 46.80g of the first esterification product, 14g of acrylic acid and 10.99g of sodium 2-acrylamide-2-methacrylic acid sulfonate are added, 55.84g of water is added to dissolve and mix until dripping. 55.84g dissolved 1.19g of ammonium persulfate and 1.62g of mercaptoethanol, and the three were added dropwise to a three-necked flask at a controlled rate so that the dripping was completed within 2±0.5 h...

Example Embodiment

[0055] Example 3:

[0056] Put 40.00g of polyethylene glycol with a molecular weight of 400, 8.4g of acrylic acid, 0.25g of hydroquinone, 1.51g of p-toluenesulfonic acid and 200g of cyclohexane into the reaction vessel, stir at 60℃, and wait until the benzene After the bisphenol and p-toluenesulfonic acid are completely dissolved, the temperature is maintained at 110~115℃ to react for 8±0.5 hours, and then filtered and vacuumed to remove the cyclohexane to obtain polyethylene glycol monomethacrylate; 60.92g of water is added In a three-necked flask and the temperature is controlled at 85±5℃, 46.80g of the first step esterified product, 22.36g of acrylic acid and 9.16g of sodium 2-acrylamide-2-methacrylic acid are added to 60.92g of water to dissolve it Mix, dissolve 1.19g of ammonium persulfate and 1.62g of mercaptoethanol with 60.92g of water, and add the three to a three-necked flask at a controlled rate and drop them in 2±0.5 hours, and continue to react for 6 hours. After the ...

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Abstract

The concrete water reducing agent of polyacrylic acid is prepared through esterification between polyglycol and acrylic acid to obtain esterified product, and the copolymerization of the esterified product with acrylic acid, 2-acrylamide-2-methyl propenyl sodium sulfonate and other sulfonate with unsaturated double bond. The concrete water reducing agent has weight average molecular weight of 20000-60000, concrete water reducing rate over 35 %, concrete compression strength raised by 100-300 % in 3 days, 40-80 % in 28 days and 30-50 % in 90 days, no loss in 2-hr slump of concrete, raised concrete placeability, etc. and is suitable for matching with flyash, slag and other active admixture to prepare high performance concrete.

Description

technical field [0001] The invention belongs to a polyacrylic acid series high-efficiency water reducer and a synthesis process. Background technique [0002] Acrylic water reducer is the third generation of water reducer. In the past, cement dispersants used to improve fluidity commonly used naphthalene sulfonic acid formaldehyde condensate salt, melamine sulfonic acid formaldehyde high condensate salt, p-aminobenzenesulfonate, water-soluble Cement dispersant such as ethylene copolymer. Concrete mixtures of cement dispersants such as naphthalenesulfonic acid formaldehyde condensate salt, melaminesulfonic acid formaldehyde high condensate salt, p-aminobenzenesulfonate and other cement dispersants have the problems of low water reducing rate and large slump loss; water-soluble ethylene Although the slump loss of the copolymer cement dispersant is small, the setting time is greatly prolonged, resulting in low early strength. At present, my country's concrete superplasticizer...

Claims

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Application Information

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IPC IPC(8): C04B24/26
Inventor 廖国胜曾勤
Owner WUHAN UNIV OF SCI & TECH
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