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A kind of preparation method of anti-mud type polycarboxylate water reducer

A technology of polycarboxylic acid and water reducing agent, applied in the field of concrete admixtures, can solve the problems of high esterification and polymerization temperature, unfavorable industrial application, corrosion of steel bars, etc., and achieves improved fluidity, improved water-reducing effect, and low production cost Effect

Active Publication Date: 2021-02-23
江苏超力建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the patent CN102617811A, a preparation method of an amphoteric vinyl polymer concrete anti-clog agent is disclosed. The cationic group is introduced into the molecular structure by first esterifying and then polymerized to obtain an anti-clog agent. However, the method The esterification and polymerization temperature are high, which is not conducive to industrial application, and the introduction of vinyl monomers containing chloride ions may cause corrosion of steel bars

Method used

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  • A kind of preparation method of anti-mud type polycarboxylate water reducer
  • A kind of preparation method of anti-mud type polycarboxylate water reducer

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Effect test

Embodiment 1

[0025] A preparation method of mud-resistant polycarboxylate water reducer, comprising the following steps:

[0026] (1) Dilute a certain amount of allyl polyoxyethylene ether into a container filled with deionized water, the molecular weight of allyl polyoxyethylene ether is 2000, the mass of allyl polyoxyethylene ether and deionized water The ratio is 1:1.2, and the temperature is raised to 45°C with stirring. After stirring evenly, the allyl polyoxyethylene ether mixture is evenly divided into three parts, which are allyl polyoxyethylene ether mixture I, allyl polyoxyethylene ether Vinyl ether mixture II and allyl polyoxyethylene ether mixture III;

[0027] (2-1) Add allyl polyoxyethylene ether mixture I, a certain amount of methacrylamide and a certain amount of hydrogen peroxide sequentially in a five-neck flask equipped with a thermometer, a stirrer, and a constant pressure funnel; Keep the temperature at 45°C under stirring conditions, then add a certain amount of bloc...

Embodiment 2

[0033] A preparation method of mud-resistant polycarboxylate water reducer, comprising the following steps:

[0034](1) Dilute a certain amount of allyl polyoxyethylene ether into a container filled with deionized water, the molecular weight of allyl polyoxyethylene ether is 2200, the mass of allyl polyoxyethylene ether and deionized water The ratio is 1:0.85, and the temperature is raised to 55°C with stirring. After stirring evenly, the allyl polyoxyethylene ether mixture is evenly divided into three parts, which are allyl polyoxyethylene ether mixture I, allyl polyoxyethylene ether Vinyl ether mixture II and allyl polyoxyethylene ether mixture III;

[0035] (2-1) Add allyl polyoxyethylene ether mixture I, a certain amount of methacrylamide and a certain amount of sodium persulfate in sequence in a five-neck flask equipped with a thermometer, a stirrer, and a constant pressure funnel ; Keep the temperature at 55°C under stirring conditions, then add a certain amount of bloc...

Embodiment 3

[0041] A preparation method of anti-mud type polycarboxylate water reducer, comprising the following steps:

[0042] (1) Dilute a certain amount of allyl polyoxyethylene ether into a container filled with deionized water, the molecular weight of allyl polyoxyethylene ether is 2400, the mass of allyl polyoxyethylene ether and deionized water The ratio is 1:0.5, and the temperature is raised to 65°C with stirring. After stirring evenly, the allyl polyoxyethylene ether mixture is evenly divided into three parts, which are allyl polyoxyethylene ether mixture I, allyl polyoxyethylene ether Vinyl ether mixture II and allyl polyoxyethylene ether mixture III;

[0043] (2-1) Add allyl polyoxyethylene ether mixture I, a certain amount of methacrylamide and a certain amount of hydrogen peroxide sequentially in a five-neck flask equipped with a thermometer, a stirrer, and a constant pressure funnel; Keep the temperature at 65°C under stirring conditions, then add a certain amount of bloc...

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Abstract

A preparation method of a mud-resistant polycarboxylate water reducer, comprising three steps: dividing the allyl polyoxyethylene ether mixed liquid into three parts; adding the first allyl polyoxyethylene ether mixed liquid Add methacrylamide and initiator, and then drop-blocked amide phosphate, reducing agent and chain transfer agent at the same time to obtain mixed solution I, add initiator to the second allyl polyoxyethylene ether mixed solution, and then add dropwise Sodium methacryl sulfonate to obtain mixed solution II; add initiator to the third allyl polyoxyethylene ether mixed solution, then add acrylic acid, reducing agent and chain transfer agent dropwise at the same time, then add mixed solution I and mixed solution After II, continue to drop acrylic acid, reducing agent and chain transfer agent. The present invention adopts normal pressure production, has low equipment requirements, is convenient to operate, and is beneficial to industrialized production; when the aggregate mud content is high, the water-reducing agent synthesized by the present invention can be used to reduce the amount of water-reducing agent without increasing the amount of water-reducing agent. The sensitivity of the water agent to the mud content of the aggregate improves the fluidity of the concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures in building materials, and in particular relates to a preparation method of a mud-resistant polycarboxylate water reducer. Background technique [0002] Polycarboxylate superplasticizer is a high molecular polymer formed by copolymerization of polyether monomers with double bonds and other unsaturated small molecules or effective groups with double bonds. It is widely used in the concrete industry due to its advantages of high performance, high slump retention, environmental protection and high durability. However, a large number of engineering examples and studies have shown that compared with naphthalene-based, melamine-based and sulfamic acid-based water-reducers, polycarboxylate water-reducers are particularly sensitive to the clay content of aggregates. With the explosive growth of concrete construction in recent years, the resources of high-quality sand and gravel aggregates hav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/56C08F228/02C08F220/06C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F283/065C08F220/56C08F228/02C08F220/06
Inventor 黄立军王若臣佟莉王爱军
Owner 江苏超力建材科技有限公司