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Water reducing agent of poly carboxylic acid series concrete and its preparation process

A concrete water-reducing agent and polycarboxylic acid-based technology, which are applied in the field of polycarboxylic acid-based concrete water-reducing agent and preparation, can solve the problems of high equipment requirements, complex production process, low water-reducing rate, etc. The effect of easy control of reaction conditions and stable performance

Inactive Publication Date: 2006-01-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the problems of complex production process, high equipment requirements and low water reducing rate in the past, and provide a polycarboxylate concrete water reducing agent and its preparation method. The water reducing agent synthesized by this method has High water reduction rate, simple synthesis process, simple and easy to control reaction conditions, easy industrial production, etc.

Method used

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  • Water reducing agent of poly carboxylic acid series concrete and its preparation process
  • Water reducing agent of poly carboxylic acid series concrete and its preparation process
  • Water reducing agent of poly carboxylic acid series concrete and its preparation process

Examples

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Effect test

Embodiment 1

[0036] Put 7.91g of sodium methacrylsulfonate into a reaction vessel, add 15.82g of water, stir evenly, raise the temperature, add 72g of acrylic acid dropwise at a temperature of 80±5°C, and add ammonium persulfate solution (0.39g ammonium persulfate and 0.79g water), the mol ratio of reaction substance sodium methacrylate and acrylic acid is 0.05: 1, and the initiator ammonium persulfate consumption is 0.5% of the total mass of sodium methacrylate and acrylic acid. Acceleration, the drop is completed within 90 minutes, keep the temperature at 85±5°C, and react for another 6.5 hours. Then add polyethylene glycol 100g with a molecular weight of 1000, p-toluenesulfonic acid 1.79g, wherein the molar ratio of polyethylene glycol and acrylic acid used is 0.1:1, and the amount of p-toluenesulfonic acid is polyethylene glycol and active group 1% of the total mass of the polymer, stirring and continuing to heat, react for another 11 hours, stop heating, when the temperature drops to ...

Embodiment 2

[0039]Put 7.91g of sodium methacrylsulfonate into a reaction vessel, add 15.82g of water, stir evenly, raise the temperature, add 7.2g of acrylic acid dropwise at a temperature of 80±5°C, and add ammonium persulfate solution (1.51 g ammonium persulfate and 3.02g water), the mol ratio of reaction substance sodium methacrylate and acrylic acid is 0.5: 1, and the initiator ammonium persulfate consumption is 10% of sodium methacrylate and acrylic acid gross mass, control Dropping speed, the drop is completed within 90 minutes, and the temperature is maintained at 85±5°C, and the reaction is continued for 6.5 hours. Then add 60 g of polyethylene glycol with a molecular weight of 1000, and 7.5 g of p-toluenesulfonic acid, wherein the molar ratio of polyethylene glycol and acrylic acid used is 0.6: 1, and the amount of p-toluenesulfonic acid is polyethylene glycol and active groups. 10% of the total mass of the high molecular polymer, stirring and continuing to heat, and then reactin...

Embodiment 3

[0042] Put 7.91g of sodium methacrylate into a reaction vessel, add 15.82g of water, stir evenly, raise the temperature, add 36g of acrylic acid dropwise at a temperature of 80±5°C, and add ammonium persulfate solution (1.98g ammonium persulfate and 3.96g water), the mol ratio of reaction substance sodium methacrylate and acrylic acid is 0.1: 1, and the initiator ammonium persulfate consumption is 4.5% of the total mass of sodium methacrylate and acrylic acid. Acceleration, the drop is completed within 90 minutes, keep the temperature at 85±5°C, and react for another 6.5 hours. Then add 150 g of polyethylene glycol with a molecular weight of 1000, and 3.87 g of p-toluenesulfonic acid, wherein the molar ratio of polyethylene glycol and acrylic acid used is 0.3:1, and the amount of p-toluenesulfonic acid is polyethylene glycol and active group 2% of the total mass of the polymer, stirring and continuing to heat, react for another 11 hours, stop heating, when the temperature drop...

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Abstract

A poly-carboxylic acid-series water reducing agent for high-performance concrete is prepared through reaction between sodium methylacrylsulfonate and acrylic acid under the action of trigger to obtain a high-molecular polymer, and esterifying reaction on polyethanediol. Its advantages are low content of alkali, high water reducing effect, and high effect to improve performance of 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 early demoulding 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. However, the maleic anhydride-bas...

Claims

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Application Information

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IPC IPC(8): C04B24/26C04B24/04C04B103/30
Inventor 马保国谭洪波董荣珍
Owner WUHAN UNIV OF TECH
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