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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 water reducing agent is very complicated, and the reaction process requires high equipment

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

Embodiment 1

[0051] Embodiment 1: Get the best matching 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 a reaction vessel, stir at a temperature of 60° C. After diphenol and p-toluenesulfonic acid are completely dissolved, then keep the temperature at 80-90°C for 8 hours, then filter, vacuumize and remove cyclohexane to obtain polyethylene glycol monoacrylate; add 54.41g of water into a three-necked flask and The temperature is controlled at 85±5°C, and then 46.80g of the esterification product of the first step, 14g of acrylic acid and 9.16g of sodium 2-acrylamide-2-methylpropene sulfonate are added, and 54.41g of water is added to dissolve and mix until dripped. Dissolve 1.19 g of ammonium persulfate and 1.62 g of mercaptoethanol in 54.41 g, and add the three to the three-necked flask at a controlled rate dropwise, so that the drops are completed ...

Embodiment 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 a reaction vessel, stir at a temperature of 60°C, and wait for p-toluenesulfonic acid to After diphenol and p-toluenesulfonic acid are completely dissolved, then keep the temperature at 80-90°C for 8 hours, then filter, vacuumize and remove cyclohexane to obtain polyethylene glycol monoacrylate; add 55.84 g of water into a three-necked flask and Control the temperature at 85±5°C, then add 46.80g of the first step esterification product, 14g of acrylic acid and 10.99g of sodium 2-acrylamide-2-methylpropene sulfonate, add 55.84g of water to dissolve and mix until dripping, then add water Dissolve 1.19 g of ammonium persulfate and 1.62 g of mercaptoethanol in 55.84 g, and add the three to the three-necked flask at a controlled rate dropwise, so that the drops are completed within 2 ± 0.5 hours, and the r...

Embodiment 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 a reaction vessel, stir at a temperature of 60°C, and wait for p-toluenesulfonic acid to After the diphenol and p-toluenesulfonic acid are completely dissolved, then keep the temperature at 110-115°C and react for 8±0.5 hours, then filter, vacuumize and remove cyclohexane to obtain polyethylene glycol monomethacrylate; add 60.92g of water There is a three-necked flask and the temperature is controlled at 85±5°C, then add 46.80g of the esterification product of the first step, 22.36g of acrylic acid and 9.16g of sodium 2-acrylamide-2-methylpropenesulfonate, and add 60.92g of water to dissolve them Mix, dissolve 1.19 g of ammonium persulfate and 1.62 g of mercaptoethanol in 60.92 g of water, and add the three to the three-necked flask at a controlled rate dropwise, so that the drops are completed within ...

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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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