Early-strength ethers polycarboxylic acid water reducing agent and preparation method thereof

An early-strength, polycarboxylic acid technology, applied in the field of ether early-strength polycarboxylate water reducer and its preparation, can solve the problems of small synergy space, short setting time, high early strength, and achieve safe operation. Good properties, low reaction temperature and low requirements

Inactive Publication Date: 2016-05-25
湖北鑫城普瑞化学科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an ether early-strength polycarboxylate superplasticizer, which solves the problems of poor product adaptability, adjustment, and little synergistic space in the prior art, and has short setting time and high early strength. The characteristics; the present invention also provides its preparation method

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  • Early-strength ethers polycarboxylic acid water reducing agent and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] The preparation method of ether early-strength polycarboxylate water reducer is as follows:

[0025] Under normal temperature conditions, add 440g of deionized water into a 1L glass flask, start stirring, add 360g of methallyl polyoxyethylene ether with a molecular weight of 6000, and after fully dissolving, add 1.8g of hydrogen peroxide with a concentration of 27.5wt%. Then add successively a solution A mixed with 14.4g acrylic acid, 19.8g sodium p-styrene sulfonate, and 40g deionized water and a solution B mixed with 0.72g vitamin C, 1.08g mercaptoacetic acid, and 80g deionized water, dropwise Adding time is 1.5h, after stirring for 1h, add NaOH solution with a concentration of 30wt% to neutralize to a pH value of 5-7, and then add water to a solid content of 40wt%, to obtain an ether-based early-strength polycarboxylate superplasticizer.

Embodiment 2

[0027] The preparation method of ether early-strength polycarboxylate water reducer is as follows:

[0028] At room temperature, add 193.8g of deionized water to a 1L glass flask, start stirring, add 360g of methallyl polyoxyethylene ether with a molecular weight of 7000, and after it is fully dissolved, add 3.6g of ammonium persulfate, and then drop Add solution A mixed with 25.2g of acrylic acid, 10.8g of sodium methacrylate, and 40g of deionized water and solution B of 1.44g of sodium bisulfite, 2.16g of mercaptopropionic acid, and 80g of deionized water, drop Adding time is 2 hours, after stirring for 1 hour, add NaOH solution with a concentration of 30wt% to neutralize to a pH value of 5-7, and then add water to a solid content of 40wt% to obtain an ether-based early-strength polycarboxylate superplasticizer.

Embodiment 3

[0030] The preparation method of ether early-strength polycarboxylate water reducer is as follows:

[0031] At room temperature, add 300g of deionized water to a 1L glass flask, start stirring, add 360g of methallyl polyoxyethylene ether with a molecular weight of 8000, and after fully dissolving, add 1g of 27.5wt% hydrogen peroxide and 1.5 g ammonium persulfate, then dropwise added solution A mixed with 21.6g acrylic acid, 9g sodium p-styrene sulfonate, 40g deionized water and 1.08g vitamin C, 0.8g mercaptoacetic acid, 1g mercaptopropionic acid, 80g deionized water The solution B mixed with ionic water, the dropping time is 2.5h, after stirring for 0.5h, add a NaOH solution with a concentration of 30wt% to neutralize to a pH value of 5-7, and then add water to a solid content of 40wt%, to obtain ethers Strong polycarboxylate superplasticizer.

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Abstract

The invention relates to an early-strength ethers polycarboxylic acid water reducing agent and a preparation method thereof, belonging to the technical field of construction concrete additives. The preparation method of the early-strength ethers polycarboxylic acid water reducing agent comprises the steps: mixing and dissolving TPEG with a molecular weight of 6000 to 8000 and deionized water at the normal temperature, then adding a catalyst, then successively dropwise adding a solution A formed by mixing acrylic acid, sulphosalts unsaturated monomers and deionized water and a solution B formed by mixing an initiator, a chain transfer agent and deionized water to perform the water-based polymerization reaction, stirring after the dropwise addition, and finally adding an alkaline liquid to perform the neutralization to obtain the early-strength ethers polycarboxylic acid water reducing agent. A great amount of rigid benzene rings and sulfonate radicals are introduced into the molecular structure of the water reducing agent, so that the content of carboxylic groups having a delayed coagulation effect in the polycarboxylic acid molecules is greatly reduced, the early strength effect of the polycarboxylic acid water reducing agent molecules is greatly improved, a certain water reducing performance is achieved, and the application prospect is wide.

Description

technical field [0001] The invention relates to an ether early-strength polycarboxylate water reducer and a preparation method thereof, belonging to the technical field of building concrete admixtures. Background technique [0002] With the continuous development and progress of the synthesis technology of polycarboxylate high-performance water reducer, in the actual production process of commercial concrete, especially prefabricated components, there is a demand for a new type of functional water reducer—early-strength polycarboxylate water reducer More urgently, it can improve the working performance of concrete, significantly increase the early strength and production efficiency of concrete, and at the same time reduce production energy consumption. The polycarboxylate superplasticizer with early strength function can effectively solve the problems of low early strength and concrete susceptibility to freezing damage during construction in winter, and at the same time can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F212/14C08F220/06C08F228/02C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F283/065C08F212/14C08F220/06
Inventor 王双平王建军程晓亮张晓娜
Owner 湖北鑫城普瑞化学科技有限公司
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