Water reducing agent and preparation method thereof

A technology of water reducing agent and initiator, which is applied in the field of water reducing agent and its preparation, which can solve the problems of compatibility difficult to meet the requirements of admixtures, long concrete setting time, and large amount of early strength agent, so as to avoid steam Maintenance costs, outstanding economic benefits, and the effect of improving early strength

Inactive Publication Date: 2019-06-21
SHANXI HUANGTENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the short length of the side chain of the commonly used polycarboxylate superplasticizer, the setting time of concrete is too long and the early strength is too low
[0004] At present, early-strength polycarboxylate superplasticizer is composed of early-strength agent and polycarboxylate water-reducer, but due to the large amount of early-strength agent (especially in winter), the amount of admixture is too small , which makes it difficult for the compatibility of the two to meet the engineering requirements for admixtures

Method used

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  • Water reducing agent and preparation method thereof
  • Water reducing agent and preparation method thereof
  • Water reducing agent and preparation method thereof

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preparation example Construction

[0032] The embodiment of the invention also discloses a preparation method of the water reducing agent, which includes the following steps:

[0033] Mixing unsaturated bond-containing polyoxyethylene ether, unsaturated amide, initiator and water to obtain a mixed solution; the addition amount of the initiator is 0.1 to 5% of the total mass of the unsaturated monomer;

[0034] Dissolve the unsaturated carboxylic acid monomer or its derivative in water to obtain a combined solution A;

[0035] Mix the reducing agent, the chain transfer agent and water to obtain the combined solution B; the addition amount of the reducing agent is 0.1 to 6% of the total mass of the unsaturated monomer; the addition amount of the chain transfer agent is the total mass of the unsaturated monomer 0.1~6%;

[0036] The combination liquid A and the combination liquid B are added dropwise to the mixed liquid to carry out a polymerization reaction to obtain a water reducing agent;

[0037] The unsaturated monomer...

Embodiment 1

[0050] In a four-necked flask equipped with a thermometer, a stirrer and a constant-flow dripping pump, add 312.0g of water, 355g of prenol-based polyoxyethylene ether (molecular weight 1200) and start stirring, then add 20g of acrylamide and mix Evenly, the temperature is raised to 60° C., and 6.2 g of 30% hydrogen peroxide is added to obtain a mixed solution.

[0051] 28.6g acrylic acid was dissolved in 180.0g deionized water to obtain a combination liquid A;

[0052] 0.7g of ascorbic acid and 3.1g of mercaptopropionic acid were dissolved in 100.0g of deionized water and mixed uniformly to obtain a combination liquid B;

[0053] In the mixed liquid, start to drip the combined liquid A and the combined liquid B respectively, and the uniform dripping is completed within 2.5 hours. The temperature of the reaction system is maintained at 58℃~62℃, after that, the temperature of the system is increased to 68~72℃, and the constant temperature stirring is continued for 1.5h. Finally, the ...

Embodiment 2

[0055] In a four-necked flask equipped with a thermometer, a stirrer, and a constant-flow dripping pump, add 320g of water, 355.8g of prenol-based polyoxyethylene ether with a molecular weight of 2400 and start stirring, then add 25g of acrylamide and mix well. The temperature was raised to 60° C., and 6.2 g of hydrogen peroxide with a mass concentration of 30% was added to obtain a mixed solution.

[0056] 30g acrylic acid is dissolved in 180g deionized water to obtain a combination liquid A;

[0057] 0.6 g of ascorbic acid and 2.3 g of mercaptopropionic acid were dissolved in 100 g of deionized water and mixed uniformly to obtain a combination liquid B;

[0058] In the mixed liquid, start to drip the combined liquid A and the combined liquid B respectively, and the uniform dripping is completed within 2.5 hours. The temperature of the reaction system is maintained at 58℃~62℃, after that, the temperature of the system is increased to 68~72℃, and the constant temperature stirring is...

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Abstract

The invention relates to the field of concrete admixtures, particularly to a water reducing agent and a preparation method thereof, wherein the water reducing agent is formed by polymerizing an unsaturated monomer under the action of an initiator, a reducing agent and a chain transfer agent, the unsaturated monomer comprises: 79-90 wt% of unsaturated bond-containing polyoxyethylene ether, 3-8 wt%of unsaturated amide, and 7-13 wt% of unsaturated carboxylic acid or a derivative thereof, and the unsaturated bond-containing polyoxyethylene ether has a molecular weight of 1200-5000. According to the present invention, the water reducing agent has characteristics of remarkable water reducing effect and early strength performance, can well solve the low early-strength in the winter constructionprocess so as to protect the concrete from freezing damage, and can improve the template running cycle, reduce or even eliminate the steam maintenance costs, accelerate construction progress and improve economic benefits; and the preparation method has characteristics of simpleness, no industrial three-waste generation, environment protection, low production cost and significant economic benefit.

Description

Technical field [0001] The invention relates to the field of concrete admixtures, in particular to a water reducer and a preparation method thereof. Background technique [0002] Water reducer is a concrete admixture that can reduce the water consumption for mixing while maintaining the slump of concrete basically unchanged. Most of them are anionic surfactants, such as lignosulfonate, naphthalenesulfonate formaldehyde polymer and so on. After adding the concrete mixture, it can disperse the cement particles, which can improve its workability, reduce the unit water consumption, improve the fluidity of the concrete mixture, or reduce the unit cement consumption and save cement. [0003] Among them, the high water reduction and good working performance of polycarboxylic acid high-performance water-reducing agent make it widely used in the production of high-performance concrete. However, the commonly used polycarboxylic acid water-reducing agent due to its short side chain length c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/56C08F220/06C04B24/26C04B103/30
Inventor 孙肖武关世发恵蔷
Owner SHANXI HUANGTENG CHEM
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