A kind of preparation method of stable concrete slump control agent

A concrete and slump technology, applied in the field of building materials, can solve the problems that the slump-preserving effect is susceptible to temperature, insufficient slump-preserving effect, and influence, etc., and achieves the effect of excellent slump retention effect and high initial water reduction rate.

Active Publication Date: 2019-07-19
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the shortage of resources and the improvement of concrete performance requirements, polycarboxylate superplasticizers often have problems in the popularization and application of the slump-preserving effect, and the slump-preserving effect is easily affected by factors such as temperature. A stable concrete slump control agent that is not sensitive to the conditions of use is of great significance

Method used

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  • A kind of preparation method of stable concrete slump control agent
  • A kind of preparation method of stable concrete slump control agent
  • A kind of preparation method of stable concrete slump control agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Mix 240.00g of acrylic acid, 200.00g of p-hydroxybenzenesulfonic acid, and 6.50g of phenothiazine. Under the protection of nitrogen, heat up to 60°C, add 8.23g of p-toluenesulfonic acid, heat up to 110°C, and keep the temperature for 2 hours. During the period, the water is removed by vacuumizing or nitrogen-carrying water, and the reaction is cooled to room temperature after the end of the reaction to obtain the first mixture containing the esterification product and unreacted acrylic acid;

[0027] (2) Mix 20.00 g of the first mixture prepared in step (1), 185.00 g of 4-hydroxybutyl vinyl polyoxyethylene ether with a molecular weight of 2400, and add 120.00 g of water to dissolve it to obtain a comonomer mixture solution;

[0028] (3) Mix the above-mentioned comonomer mixture solution with hydrogen peroxide aqueous solution (wherein, hydrogen peroxide 1.20g, water 20.00g), ascorbic acid aqueous solution (wherein, ascorbic acid 0.40g, water 20.00g), ferrous sulfate...

Embodiment 2

[0031] (1) Mix 247.00g of methacrylic acid, 200.00g of p-hydroxymethylbenzenesulfonic acid, 5.60g of hydroquinone, and 2.00g of phenothiazine. Under the protection of nitrogen, the temperature is raised to 50°C, and 8.20g of mass fraction is added. 98% concentrated sulfuric acid, heat up to 115°C, keep warm for 3 hours, remove water by vacuuming or blowing nitrogen with water, and cool down to room temperature after the reaction to obtain the first product containing esterification products and unreacted methacrylic acid. a mixture;

[0032] (2) Mix 20.00 g of the first mixture prepared in step (1) with 260.00 g of 4-hydroxybutyl vinyl polyoxyethylene ether with a molecular weight of 2400, and add 150.00 g of water to dissolve it to obtain a comonomer mixture solution;

[0033] (3) Mix the above-mentioned comonomer mixture solution with hydrogen peroxide aqueous solution (wherein, hydrogen peroxide 1.10g, water 20.00g), dimple aqueous solution (wherein, dimple 0.70g, water 20...

Embodiment 3

[0036] (1) Mix 156g of acrylic acid, 86g of methacrylic acid, 200.00g of p-hydroxyethylbenzenesulfonic acid, and 4.20g of hydroquinone. Under nitrogen protection, heat up to 60°C, add 6.30g of ethylsulfonic acid, and heat up to 110°C, heat preservation reaction for 2 hours, during which the water was removed by vacuuming or nitrogen with water, and after the reaction was completed, it was lowered to room temperature to obtain the first mixture containing the esterification product and unreacted acrylic acid and methacrylic acid;

[0037] (2) Mix 20.00 g of the first mixture prepared in step (1) with 233.00 g of 4-hydroxybutyl vinyl polyoxyethylene ether with a molecular weight of 2400, and add 150.00 g of water to dissolve it to obtain a comonomer mixture solution;

[0038](3) Mix the above-mentioned comonomer mixture solution with hydrogen peroxide aqueous solution (wherein, hydrogen peroxide 1.30g, water 20.00g), ascorbic acid aqueous solution (wherein, ascorbic acid 0.30g, ...

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Abstract

The invention discloses a preparation method of a stabilized concrete slump control agent. Structures of ester group, a benzene ring and a sulfonic group are introduced into a molecular structure by means of esterification products of unsaturated carboxylic acid and a compound A; in the initial time, the sulfonic group having a water reducing effect and the benzene ring having a stereo-hindrance effect are introduced, so that the product has higher initial water reducing rate, and the introduced ester group structure is gradually hydrolyzed under the concrete alkaline condition; furthermore, the number of groups having a dispersion effect in the molecular structure of the product does not change much before and after hydrolysis of the ester group, so that the problem of concrete slump lag amplification caused by excessively fast hydrolysis of the ester group can be avoided, and the problem of excessively fast concrete slump loss caused by excessively slow hydrolysis of the ester group can be also solved; therefore, the method is not easily influenced by the change of service conditions in a use process and can be used for stably controlling the concrete slump.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a preparation method of a stable concrete slump control agent. Background technique [0002] With the rapid development of concrete technology in the direction of high strength, green and high performance, the water reducing agent as an important part of concrete has also been put forward higher and more comprehensive requirements. In the past, traditional concrete water reducers, such as the first generation of lignin and the second generation of naphthalene sulfonate, sulfonated melamine, sulfamic acid, aliphatic and other water reducers, due to the large amount, The water reducing rate is not high enough, the reinforcement effect is not very significant, and the concrete slump loss is relatively large, which has gradually failed to meet the development of modern concrete technology and modern concrete construction methods. Especially in the production p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/38C04B24/16C04B103/30
CPCC04B24/165C04B2103/308C08F283/065C08F220/382
Inventor 蒋卓君方云辉陈小路林艳梅官梦芹尤仁良麻秀星
Owner KZJ NEW MATERIALS GROUP CO LTD
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