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A kind of shrinkage-reducing polycarboxylate water-reducing agent and preparation method thereof

A technology of polycarboxylate and water reducer, applied in the field of concrete admixture, can solve the problems of affecting the stability of polycarboxylate water reducer, limiting polycarboxylate water reducer, affecting the setting time of concrete, etc., to improve the adsorption conformation , The preparation method is simple, and the effect of strengthening the strength

Active Publication Date: 2022-08-02
武汉优城科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the compound with polyhydroxy structure has retarding effect, which will affect the setting time of concrete, thus limiting the use of the polycarboxylate superplasticizer, and the micro-crosslinked structure formed by the hydrogen bond between hydroxyl and water molecules will affect the polycarboxylate superplasticizer. Stability of Carboxylic Acid Water Reducer in Aqueous Solution

Method used

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  • A kind of shrinkage-reducing polycarboxylate water-reducing agent and preparation method thereof
  • A kind of shrinkage-reducing polycarboxylate water-reducing agent and preparation method thereof
  • A kind of shrinkage-reducing polycarboxylate water-reducing agent and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] The present embodiment provides a shrinkage-reducing polycarboxylate water-reducing agent and a preparation method thereof, specifically:

[0033] S1, the mass ratio of nickel and magnesium oxide of 2:1 is filled in an airtight container as a catalyst, and into the airtight container, R group is added hydroxy-terminated polyoxyethylene polyoxypropylene ether of phenethylphenol (where m=10 , n=4) and liquid nitrogen, and the mass ratio of the hydroxyl-terminated polyoxyethylene polyoxypropylene ether and liquid nitrogen is 1:0.04, the reaction temperature is controlled at 200-250°C, and the reaction pressure is controlled at 1-20Mpa, The ammoniation reaction was carried out for 2 hours; after the reaction product was separated from gas and liquid, the liquid material was dehydrated and deaminated, and then placed in a closed container for ammoniation, so that the hydroxyl-terminated polyoxyethylene polyoxypropylene ether was completely aminated, and finally the reaction p...

Embodiment 2

[0038]The difference between this example and Example 1 is that: methallyl polyoxyethylene ether, maleic acid acylated polyetheramine, ethylenically unsaturated carboxylic acid of acrylic acid, oxidant of hydrogen peroxide, corbic acid The mass ratio of the reducing agent and the molecular weight regulator of thioglycolic acid was 100:3:10:0.5:0.3:0.5.

Embodiment 3

[0040] Wherein the mass ratio of methallyl polyoxyethylene ether, maleic acid acylated polyetheramine, ethylenically unsaturated carboxylic acid of acrylic acid, oxidant of hydrogen peroxide, corbic acid reducing agent and molecular weight regulator of mercaptoacetic acid is: 100:3:12:0.5:0.3:0.5.

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Abstract

The invention discloses a shrinkage-reducing polycarboxylate water reducer and a preparation method thereof. The polycarboxylate water reducer is composed of maleic anhydride acylated polyetheramine, unsaturated polyoxyethylene ether macromonomer and ethylenic It is formed by free radical polymerization of unsaturated carboxylic acid, wherein the maleic anhydride acylated polyetheramine is formed by the reaction of polyetheramine generated by amination of hydroxyl-terminated polyoxyethylene polyoxypropylene ether with maleic anhydride. The invention can reduce the surface tension of the concrete pore solution by introducing the hydrophobic maleic anhydride acylated polyetheramine side chain into the comb-shaped structure of the polycarboxylate water reducer, thereby enhancing the shrinkage reduction and reducing the air entrainment. At the same time, the polyoxyethylene polyoxypropylene long chain in maleic anhydride acylated polyetheramine can improve the adsorption conformation of polycarboxylic acid in the cement pore solution, so that the It is more stretched in solution and improves the dispersing ability of polycarboxylate superplasticizer to cement.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, in particular to a shrinkage-reducing polycarboxylate water-reducing agent and a preparation method thereof. Background technique [0002] Concrete shrinks in the initial setting or during the hardening process, and the cracks caused by the shrinkage will not only affect the appearance of the building, but also reduce the life of the concrete, and even affect the stability of the concrete structure and cause safety accidents. There are five main types of concrete shrinkage, namely: plastic shrinkage, temperature shrinkage, carbonization shrinkage, autogenous shrinkage and drying shrinkage. In order to solve the problems of drying shrinkage and plastic shrinkage, it is usually used to add materials such as expansion agent, fiber and shrinkage reducer during concrete mixing. However, expansion agent, fiber and shrinkage reducer and concrete admixtures, namely polycarboxylate water reducing There...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F290/06C08F283/06C08F220/06C04B24/26C04B103/30
CPCC08F290/062C08F283/065C08F220/06C04B24/2694C04B2103/302
Inventor 代柱端董耀武陈健周晓阳
Owner 武汉优城科技有限公司
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