High-slump-retaining early-strength polycarboxylic acid high-performance water reducing agent and preparation method thereof

An early-strength type, polycarboxylic acid technology, which is applied in the field of synthesis and preparation of polycarboxylic acid-based water-reducing agent for concrete, can solve the problem that the addition amount of compound slump-preserving mother liquor is not easy to control, concrete is easy to segregate, bleeding, and water reduction. It can solve the problems of poor slump retention effect and other problems, so as to solve the problems of poor slump retention, good slump retention and shorten setting time.

Inactive Publication Date: 2019-01-25
四川恒泽建材有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Relying on early-strength polycarboxylate superplasticizers alone obviously cannot meet the requirements. At present, it is mainly solved by compounding slump-preserving mother liquor or retarder. The addition of compound slump-preserving mother liquor is difficult to control, and concrete is easy to segregate and Water; the addition of retarders will cause the concrete to set for too long, which is not conducive to the improvement of early strength
In addition, the early-strength polycarboxylate-based superplasticizers produced by the current synthesis method have poor slump retention effect, and the early-strength effect is not obvious, and most of them adopt high-temperature synthesis process, and the equipment cost is relatively high.

Method used

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  • High-slump-retaining early-strength polycarboxylic acid high-performance water reducing agent and preparation method thereof
  • High-slump-retaining early-strength polycarboxylic acid high-performance water reducing agent and preparation method thereof

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preparation example Construction

[0025] The preparation method of described high slump retention and early strength type polycarboxylate high-performance water reducer, it comprises the following steps:

[0026] S1. Add an appropriate amount of demineralized water into the container, then slowly add prenyl polyoxyethylene ether into the container, and stir at room temperature to fully dissolve the prenyl polyoxyethylene ether;

[0027] S2. Add acrylic acid, hydroxyethyl acrylate, sodium methacrylsulfonate, 2-acrylamido-2-methylpropanesulfonic acid and acrylamide into the vessel I filled with demineralized water, and stir evenly to obtain a solution A; Ascorbic acid and chain transfer agent are added into vessel II filled with demineralized water, and stirred evenly to obtain solution B;

[0028] S3, adding hydrogen peroxide to the solution in step S1 and stirring at room temperature;

[0029] S4, in the solution of step S3, dropwise add solution A and solution B simultaneously, control solution A and solutio...

Embodiment 1

[0032] The preparation method of high-slump and early-strength polycarboxylate high-performance water reducer comprises the following steps:

[0033] S1. Add 80 parts of demineralized water to the container, then slowly add 100 parts of prenyl polyoxyethylene ether, and stir at room temperature for 20-30 minutes to fully dissolve the isopentenyl polyoxyethylene ether;

[0034] S2. Add 10 parts of acrylic acid, 12 parts of hydroxyethyl acrylate, 0.8 parts of sodium methacrylsulfonate, 0.7 parts of 2-acrylamido-2-methylpropanesulfonic acid and 2 parts of acrylamide into 35 parts of demineralized water , stir evenly to obtain solution A; add 0.16 parts of ascorbic acid and 0.5 part of thioglycolic acid to 45 parts of demineralized water, stir well to obtain solution B;

[0035] S3. Add 0.75 parts of hydrogen peroxide to the solution obtained in step S1, and stir at room temperature for 5-10 minutes;

[0036] S4, in the solution that step S3 obtains, dropwise add solution A and s...

Embodiment 2

[0039] The preparation method of high-slump and early-strength polycarboxylate high-performance water reducer comprises the following steps:

[0040] S1. Add 80 parts of demineralized water to the container, then slowly add 100 parts of prenyl polyoxyethylene ether, and stir at room temperature for 20-30 minutes to fully dissolve the isopentenyl polyoxyethylene ether;

[0041] S2. Add 12 parts of acrylic acid, 10 parts of hydroxyethyl acrylate, 0.7 parts of sodium methacrylsulfonate, 1.2 parts of 2-acrylamido-2-methylpropanesulfonic acid and 1.5 parts of acrylamide to 35 parts of demineralized water , stirred evenly to obtain solution A; 0.14 parts of ascorbic acid and 0.65 parts of mercaptopropionic acid were added to 45 parts of demineralized water, and stirred evenly to obtain solution B;

[0042] S3. Add 0.85 parts of hydrogen peroxide to the solution obtained in step S1, and stir at room temperature for 5-10 minutes;

[0043] S4, in the solution that step S3 obtains, dro...

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Abstract

The invention discloses a high-slump-retaining early-strength polycarboxylic acid high-performance water reducing agent, which comprises 100 parts of isopentenyl polyoxyethylene ether, 8-13 parts of acrylic acid, 9-14 parts of hydroxyethyl acrylate, 0.4-1.2 parts of sodium methylallyl sulfonate, 0.5-1.5 parts of 2-acrylamide-2-methyl propanesulfonic acid, 1.4-2.5 parts of acrylamide, 0.5-1 part ofhydrogen peroxide, 0.1-0.22 part of ascorbic acid, 0.4-0.7 part of a chain transfer agent, and 140-180 parts of water. The invention further discloses the preparation method of the high-slump-retaining early-strength polycarboxylic acid high-performance water reducing agent. According to the present invention, with the high-slump-retaining early-strength polycarboxylic acid high-performance waterreducing agent, the concrete mixture can have a certain slump retention ability at the initial stage, the concrete can have characteristics of short setting time and rapid early strength developmentafter the slump retention stage, the late strength cannot be affected, the turnover rate of the template can be improved, the construction progress of the project can be accelerated, and no pollutionis generated during the preparation.

Description

technical field [0001] The invention relates to the field of synthesis and preparation of polycarboxylate water-reducers for concrete, in particular to a high-slump and early-strength polycarboxylate high-performance water-reducer and a preparation method thereof. Background technique [0002] In recent years, with the continuous development and improvement of concrete technology, concrete, as one of the commonly used building materials, has been widely used in more and more fields. At the same time, higher and higher requirements have been put forward for the performance of concrete. . Excellent workability, easy pumping construction, high strength, high durability and super early strength have attracted more and more attention. Early-strength and ultra-early-strength concrete have broad market application prospects in the construction, maintenance and reinforcement of roads, bridges, ports, prestressed high-strength pipe piles and other projects. [0003] At present, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/20C08F220/56C08F228/02C08F220/58C08F220/06C08F4/40C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F4/40C08F283/065C08F220/585
Inventor 滕文生吴天淳王虎生贾维龙袁慧莉贾虎琛贺晓红
Owner 四川恒泽建材有限公司
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