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Polycarboxylic acid water reducing agent as well as preparation method and application thereof

A technology of water reducing agent and polycarboxylic acid, which is applied in the field of polycarboxylic acid water reducing agent and its preparation, can solve the problems of low strength and high air content in concrete, and achieve low volatility, outstanding defoaming ability and excellent performance Effect

Pending Publication Date: 2020-10-16
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polycarboxylate water reducer introduces hydrophilic and hydrophobic groups into the polymer to improve the defects of high air content and low strength of concrete, and at the same time improves the ability of the water reducer molecules to resist sulfate adsorption, making the water reducer more excellent. performance

Method used

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  • Polycarboxylic acid water reducing agent as well as preparation method and application thereof
  • Polycarboxylic acid water reducing agent as well as preparation method and application thereof
  • Polycarboxylic acid water reducing agent as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0040] This embodiment provides a polycarboxylate water reducer, the raw materials for the preparation of the polycarboxylate water reducer include the following components in parts by weight:

[0041]

[0042]

[0043] The preparation method of described polycarboxylate water reducer comprises the following steps:

[0044] (1) Mix methacrylic acid, methyl methacrylate, polyethylene glycol and hydrogen peroxide, and carry out an esterification reaction at 65° C. for 5 hours to obtain a prepolymer;

[0045](2) Mix the prepolymer obtained in step (1), vinyltriethoxysilane and benzoyl peroxide, and carry out a free radical polymerization reaction at 85° C. for 3 hours to obtain the polycarboxylic acid water-reducing agent.

Embodiment 2

[0047] This embodiment provides a polycarboxylate water reducer, the raw materials for the preparation of the polycarboxylate water reducer include the following components in parts by weight:

[0048]

[0049] The preparation method of described polycarboxylate water reducer comprises the following steps:

[0050] (1) Mix methacrylic acid, methyl methacrylate, polyethylene glycol and hydrogen peroxide, and carry out an esterification reaction at 65° C. for 5 hours to obtain a prepolymer;

[0051] (2) Mix the prepolymer obtained in step (1), vinyltrimethoxysilane and benzoyl peroxide, and carry out a free radical polymerization reaction at 85° C. for 3 hours to obtain the polycarboxylate water reducer .

Embodiment 3

[0053] This embodiment provides a polycarboxylate water reducer, the raw materials for the preparation of the polycarboxylate water reducer include the following components in parts by weight:

[0054]

[0055]

[0056] The preparation method of described polycarboxylate water reducer comprises the following steps:

[0057] (1) Mix methacrylic acid, hydroxyethyl acrylate, polyethylene glycol and hydrogen peroxide, and carry out an esterification reaction at 55° C. for 5 hours to obtain a prepolymer;

[0058] (2) Mix the prepolymer obtained in step (1), vinyltrimethoxysilane and azobisisobutyronitrile, and carry out a free radical polymerization reaction at 75°C for 3h to obtain the polycarboxylate water-reduced agent.

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Abstract

The invention provides a polycarboxylic acid water reducing agent as well as a preparation method and application thereof. The polycarboxylic acid water reducing agent is prepared from the following raw materials in parts by weight: 30 to 60 parts of unsaturated carboxylic acid monomers, 4 to 10 parts of siloxane, 20 to 60 parts of polyether polyol, 2 to 8 parts of an oxidant and 0.5 to 3 parts ofan initiator. Hydrophilic and hydrophobic groups are introduced into a polymer, the defects that concrete is high in air content and low in strength are overcome, meanwhile, the sulfate adsorption resistance of water reducing agent molecules is improved, and the water reducing agent has a more excellent performance.

Description

technical field [0001] The invention belongs to the field of concrete admixtures for building materials, and in particular relates to a polycarboxylate water reducer and its preparation method and application. Background technique [0002] Polycarboxylate water reducer can effectively improve the flow performance of concrete mixture, reduce concrete water consumption, reduce water-cement ratio, and save cement consumption. It is a new type of high-efficiency water reducer. It is widely used in a series of major projects. Since the polycarboxylate water reducer contains a polyether structure, it has the disadvantage of high air content in the actual application process, which makes the concrete have high air content and low strength. At present, for this shortcoming of polycarboxylate water reducer, the method of compounding defoamer is often used. This method is simple and easy, but the dispersion of defoamer is poor, causing large fluctuations in air content and finally ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F283/12C08F291/16C08F291/06C08F220/06C08F220/14C08F230/08C08F220/20C08F220/18C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F261/06C08F283/06C08F283/065C08F283/124C08F220/06C08F220/14C08F230/085C08F220/20C08F220/1802
Inventor 谭强强娄平平
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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