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Concrete water reducing agent of polycarboxylic acid and its prepn process

A concrete water-reducing agent and a polycarboxylic acid-based technology, which are applied in the field of polycarboxylic acid-based concrete water-reducing agent and preparation, can solve the problem of low water reduction rate, and achieve stable performance, good appearance quality and strong product adaptability. Effect

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

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of the previous water reducing agent, such as complex production process, low water reducing rate, and too fast slump loss, and provide a polycarboxylate concrete water reducing agent and its preparation method. The water reducing agent has high performance And stable, the synthesis process is simple, the reaction conditions are easy to control, and it is easy to industrialized production

Method used

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  • Concrete water reducing agent of polycarboxylic acid and its prepn process
  • Concrete water reducing agent of polycarboxylic acid and its prepn process
  • Concrete water reducing agent of polycarboxylic acid and its prepn process

Examples

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Embodiment 1

[0030] Take the best ratio

[0031] Put 100.00g of polyethylene glycol with a molecular weight of 1000, 2.14g of concentrated sulfuric acid, and 100.00g of toluene into a reaction container, stir at a temperature of 80±5°C to completely dissolve the reactants, and then dropwise add 7.20g of acrylic acid into the container , control the dropping speed, finish dropping in 100±10 minutes, keep the temperature at 90±5°C, react for another 5 hours, vacuumize for 1 hour, pump out water and toluene, and react to form polyethylene glycol monoacrylate (PEA). Put 52.70g of PEA and 7.91g of sodium methacrylate into a reaction vessel, add 136.74g of water, stir evenly, raise the temperature, add 10.80g of acrylic acid dropwise at a temperature of 80±5°C, and drop by mass percentage 20.52g of 5% solution of ammonium persulfate and 9.36g of 10% solution of mercaptoethanol by mass percentage, the rate of addition was controlled, and the drop was completed in 100 ± 10 minutes, and the tempera...

Embodiment 2

[0033]Put 100g of polyethylene glycol with a molecular weight of 1000, 1.07g of concentrated sulfuric acid and 100g of toluene into a reaction container, stir at a temperature of 80±5°C to completely dissolve the reactants, then add 7.2g of acrylic acid dropwise to the container, and control The dropping speed is finished in 100±10 minutes, keep the temperature at 90±5°C, react for another 5 hours, vacuumize for 1 hour, pump out water and toluene, and react to form polyethylene glycol monoacrylate (PEA). Put 52.70g of PEA and 7.91g of sodium methacrylate into a reaction vessel, add 136.74g of water, stir evenly, raise the temperature, add 10.80g of acrylic acid dropwise at a temperature of 80±5°C, and add 5% by mass 20.52g of ammonium persulfate solution and 9.36g of mercaptoethanol solution with a mass percentage of 10%, the dropping speed is controlled, and the drop is completed in 100±10 minutes, and the temperature is maintained at 85±5°C, and then reacted for 6 hours. Aft...

Embodiment 3

[0035] Put 100.00g of polyethylene glycol with a molecular weight of 1000, 2.14g of concentrated sulfuric acid and 100.00g of toluene into a reaction container, stir at a temperature of 80±5°C to completely dissolve the reactant, then add 7.20g of acrylic acid dropwise to the container , control the dropping speed, finish dropping in 100±10 minutes, keep the temperature within the range of 90±5°C, react for another 5 hours, vacuumize for 1 hour, pump out water and toluene, and react to form polyethylene glycol monoacrylate (PEA ). Put 52.70g of PEA and 7.91g of sodium methacrylate into a reaction container, add 143.58g of water, stir evenly, raise the temperature, add 10.80g of acrylic acid dropwise at a temperature of 80±5°C, and add a mass percentage of 5 13.68g of the solution ammonium persulfate and 9.36g of the 10% solution of mercaptoethanol by mass percentage, the rate of addition was controlled, and the drop was completed in 100 ± 10 minutes, and the temperature was ke...

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Abstract

The concrete water reducing agent of polycarboxylic acid is prepared through esterification between polyglycol and acrylic acid in the presence of catalyst to obtain esterified product PEA, and the copolymerization of the esterified product PEA with methyl propenyl sodium sulfonate and other sulfonate and acrylic acid. The concrete water reducing agent contains carboxy radical, sulfo radical and polyoxyethylene side chain. The concrete water reducing agent has low alkali content and high water reducing rate, and may be added into concrete in the amount of 0.6-1.2 wt% of gelatinous material to result in concrete with easy operation, high flowability, excellent placeability, no loss of slump and raised early strength. The concrete water reducing agent may be used as the important component of high performance concrete.

Description

technical field [0001] The invention belongs to a polycarboxylate concrete water reducing agent and a preparation method thereof. technical background [0002] As we all know, in the operation of cement mixture, in order to make the operation labor-saving and effective, and to release the mold early to shorten the construction period, the cement mixture is required to have high fluidity, effectively inhibit the loss of slump, and have sufficient early strength in the initial stage of hardening . At present, my country's concrete superplasticizers are mainly naphthalene-based and melamine-based products. The cement mixture of these products has poor workability, low water-reducing rate and large slump loss. Although the slump loss of water-soluble ethylene copolymer cement dispersant is small, the setting time is greatly prolonged, resulting in low early strength, which cannot meet the needs of the project well, and the production process is complicated. At present, there i...

Claims

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Application Information

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IPC IPC(8): C04B24/26
Inventor 马保国谭洪波廖国胜孙恩杰董荣珍
Owner WUHAN UNIV OF TECH
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