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Super-retarding polycarboxylic acid water reducer and preparation method and using method thereof

A technology of retarding polycarboxylic acid and water reducing agent, which is applied in the field of building materials, can solve the problems of poor compatibility of retarding components, difficulty in compounding work, poor compounding effect, etc., and achieve convenient construction, production safety, The effect of simple process

Active Publication Date: 2011-11-16
河北红墙新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, since the polycarboxylate water reducer on the market has little effect on the setting time of concrete, for concrete that requires a long setting time, it is necessary to compound the use of retarding components, but research and practice have found that polycarboxylate The compatibility between water reducing agent and commonly used retarding components is poor, which brings great difficulty to the compounding work
However, traditional naphthalene-based superplasticizers and aliphatic superplasticizers have good compatibility with retarding components, which brings certain resistance to the application of polycarboxylate-based superplasticizers in special projects.
[0004] Due to the poor compounding effect of polycarboxylate superplasticizers and commonly used retarding components, and sometimes incompatibility, it is difficult to use polycarboxylate superplasticizers for concrete projects that require ultra-retarding, and the market is urgently needed. Polycarboxylate superplasticizer with ultra-retarding properties

Method used

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preparation example Construction

[0034] The preparation method of the ultra-retarded polycarboxylate water reducer of the present invention is as follows:

[0035] S100. Accurately weigh each raw material, dissolve allyl polyethylene glycol, methyl acrylate, maleic anhydride, and sucrose fatty acid ester in deionized water of a certain quality in sequence, add to the reaction kettle, mix, and stir evenly;

[0036] S200. Pass protective gas nitrogen into the reactor, insert a condenser, add ammonium persulfate, and react at 50-100°C for 4-8 hours;

[0037] S300, adding sodium lignosulfonate into the reactor, and continuing to react for 0.5-2 hours at 50-100°C;

[0038] S400. After the reactants are cooled, adjust the pH value to 6-8 with sodium hydroxide solution.

[0039] The amount of deionized water added in step S100 is 1.5 to 2.5 times the total weight of allyl polyethylene glycol, methyl acrylate, maleic anhydride, and sucrose fatty acid ester.

[0040] The sodium hydroxide solution used in step S400 i...

Embodiment 1

[0045] An ultra-retarded polycarboxylate water reducer, the raw materials are as follows: allyl polyethylene glycol (number average molecular weight: 600) 100, methyl acrylate 3, maleic anhydride 0.1, lignosulfonic acid Sodium 5, sucrose fatty acid ester 0.5, ammonium persulfate 0.1, sodium hydroxide 8. The synthesis process is as follows: (1) Accurately weigh each raw material, dissolve allyl polyethylene glycol, methyl acrylate, maleic anhydride, and sucrose fatty acid ester in deionized water of a certain quality, add to the reaction kettle, and mix , and stir evenly; (2) Introduce protective gas nitrogen into the reactor, insert a condenser, add ammonium persulfate, and react at 50°C for 8 hours; (3) Add sodium lignosulfonate into the reactor, Continue to react at 70°C for 0.5 hours; (4) After the reactants are cooled, adjust the pH value to 6~8 with sodium hydroxide solution. Adding this product, which accounts for 1.0% of the cement mass, the concrete slump reaches 21cm...

Embodiment 2

[0047]An ultra-retarded polycarboxylate water reducer, the raw materials are as follows: allyl polyethylene glycol (number average relative molecular mass is 1200) 100, methyl acrylate 50, maleic anhydride 50, lignosulfonic acid Sodium 20, Sucrose Fatty Acid Ester 10, Ammonium Persulfate 20, Sodium Hydroxide 3. The synthesis process is as follows: (1) Accurately weigh each raw material, dissolve allyl polyethylene glycol, methyl acrylate, maleic anhydride, and sucrose fatty acid ester in deionized water of a certain quality, add it to the reaction kettle, and mix , and stir evenly; (2) Introduce protective gas nitrogen into the reactor, insert a condenser, add ammonium persulfate, and react at 100°C for 4 hours; (3) Add sodium lignosulfonate into the reactor, Continue to react at 100°C for 1.5 hours; (4) After the reactants are cooled, adjust the pH value to 6~8 with sodium hydroxide solution. Adding this product, which accounts for 1.2% of the cement mass, the concrete slump...

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Abstract

The invention discloses a super-retarding polycarboxylic acid water reducer and a preparation method and a using method thereof. The super-retarding polycarboxylic acid water reducer is directly synthesized in the presence of ammonium sulfate by using allyl polyethylene glycol (with number-average molecular weight of 600 to 2,400), methyl acrylate, maleic anhydride, sodium lignosulphonate and sucrose fatty acid ester and by neutralizing with sodium hydroxide. The price of the raw materials is low, the product performance is stable, and the market prospect is bright.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to an ultra-retarded polycarboxylate water reducer and its preparation and use methods. Background technique [0002] Concrete admixture is an indispensable component of modern concrete, which can reasonably improve the performance of concrete according to the specific requirements of users. Adding an appropriate amount of retarding water-reducing agent into the concrete can prolong the setting time of the concrete, reduce the loss of slump, ensure the normal construction of the concrete, improve the work efficiency, and the strength of the concrete increases well after hardening, which is suitable for long-term parking, Concrete transported over long distances, as well as vibration-free self-compacting concrete, mass concrete, concrete constructed in hot weather, etc. In prestressed reinforced concrete post-tensioning grouting materials, the required concrete setting ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/18C04B103/30
Inventor 赵利华黄海燕翟冲
Owner 河北红墙新材料有限公司
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