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Shrinkage-reducing polycarboxylate superplasticizer and preparation method thereof

A technology of polycarboxylic acid and water reducing agent, applied in the field of building materials, can solve the problems of adverse effects of concrete strength, difficulty in determining the amount of expansion agent used, etc., and achieve the effects of improving shrinkage phenomenon, high reproducibility and convenient use.

Pending Publication Date: 2020-11-13
陈兴涛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that it is difficult to determine the amount of expansion agent used to solve the shrinkage of concrete, and the addition of the existing polycarboxylate water reducer will have an adverse effect on the strength of concrete, and a shrinkage-reducing polycarboxylate is proposed. Water reducing agent and preparation method thereof

Method used

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  • Shrinkage-reducing polycarboxylate superplasticizer and preparation method thereof
  • Shrinkage-reducing polycarboxylate superplasticizer and preparation method thereof

Examples

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Effect test

Embodiment 1

[0021] A shrinkage-reducing polycarboxylate water reducer proposed by the present invention includes the following raw materials in parts by weight: 100 parts of polyethylene glycol monomethyl ether, 9 parts of methacrylic acid, 0.06 parts of dibutyl maleate, 2,6 -0.8 parts of nonadienol, 0.6 parts of sodium 4-cumene sulfonate, 1.5 parts of initiator, 0.18 parts of catalyst, 1.4 parts of diafenthiuron, 1.4 parts of 4-hydroxymethylimidazole hydrochloride, 10 parts of isopropanol parts, 78 parts of water;

[0022] Among them, the average molecular weight of polyethylene glycol monomethyl ether is 5000; the initiator is composed of potassium permanganate and oxalic acid with a mass ratio of 1:1; the catalyst is composed of ferric iron tetroxide and 1,10-Phenanthroline is compounded, and the specific compounding method is as follows: Take ferric oxide with corresponding specific gravity, add absolute ethanol with 5 times the mass of ferric oxide, raise the temperature to 70°C, sti...

Embodiment 2

[0028] A shrinkage-reducing polycarboxylate water-reducer proposed by the present invention includes the following raw materials in parts by weight: 96 parts of polyethylene glycol monomethyl ether, 12 parts of methacrylic acid, 0.1 part of dibutyl maleate, 2,6 -0.5 parts of nonadienol, 0.4 parts of sodium 4-cumene sulfonate, 2 parts of initiator, 0.16 parts of catalyst, 1.9 parts of diafenthiuron, 0.9 parts of 4-hydroxymethylimidazole hydrochloride, 12 parts of isopropanol parts, 75 parts of water;

[0029] Among them, the average molecular weight of polyethylene glycol monomethyl ether is 5000; the initiator is composed of potassium permanganate and oxalic acid with a mass ratio of 1:1; the catalyst is composed of ferric iron tetroxide and 1,10-Phenanthroline is compounded, and the specific compounding method is as follows: Take ferric oxide with corresponding specific gravity, add absolute ethanol with 6 times the mass of ferric oxide, raise the temperature to 70°C, stir fo...

Embodiment 3

[0035] A shrinkage-reducing polycarboxylate water reducer proposed by the present invention includes the following raw materials in parts by weight: 92 parts of polyethylene glycol monomethyl ether, 18 parts of methacrylic acid, 0.14 parts of dibutyl maleate, 2,6 -0.3 parts of nonadienol, 0.2 parts of sodium 4-cumene sulfonate, 2.5 parts of initiator, 0.14 parts of catalyst, 2.4 parts of diafenthiuron, 0.7 parts of 4-hydroxymethylimidazole hydrochloride, 15 parts of isopropanol parts, 72 parts of water;

[0036] Among them, the average molecular weight of polyethylene glycol monomethyl ether is 5000; the initiator is composed of potassium permanganate and oxalic acid with a mass ratio of 1:1; the catalyst is composed of ferric iron tetroxide and 1,10-Phenanthroline is compounded, and the specific compounding method is as follows: Take ferric oxide with corresponding specific gravity, add absolute ethanol with 8 times the mass of ferric oxide, raise the temperature to 70°C, and...

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Abstract

The invention provides a shrinkage-reducing polycarboxylate superplasticizer and a preparation method thereof. The shrinkage-reducing polycarboxylate superplasticizer is prepared from the following raw materials: methoxypolyethylene glycol, methacrylic acid, dibutyl maleate, 2, 6-nonadiene alcohol, sodium 4-isopropylbenzene sulfonate, an initiator, a catalyst, diafenthiuron, 4-hydroxymethylimidazole hydrochloride, isopropanol and water. The preparation method of the shrinkage-reducing polycarboxylate superplasticizer comprises the following steps: S1, preparing raw materials; S2, transferringthe polyethylene glycol monomethyl ether, the dibutyl maleate and the catalyst into a reaction bottle to react, adding the diafenthiuron and the 4-hydroxymethylimidazole hydrochloride, and stirring continuly to obtain a mixture A; and S3, adding the methacrylic acid, the 2, 6-nonadiene alcohol and the sodium 4-isopropylbenzene sulfonate into the mixture A, cooling to room temperature, and adjusting the pH value to obtain the shrinkage-reducing polycarboxylate superplasticizer. The shrinkage-reducing polycarboxylate superplasticizer provided by the invention is excellent in shrinkage reducing performance and has little influence on the strength of concrete.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a shrinkage-reducing polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Concrete is currently the most widely used building material, and almost all engineering buildings use concrete. However, concrete often shrinks in volume after pouring and hardening, that is, concrete shrinkage occurs. If the shrinkage is too large, the resulting shrinkage stress will cause the concrete to crack, affect the durability of the concrete, and significantly reduce the service life of the concrete. At present, the shrinkage of concrete is mainly reduced by adding expansive agents in the market, but in actual operation, it is difficult to determine the amount of expansive agents applied. In recent years, the advent of polycarboxylate superplasticizers has brought good news to the solution of concrete shrinkage. At present, the performance of ...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F216/04C08G65/333C08G65/332C04B24/26C04B103/30
CPCC08F283/065C08G65/3348C08G65/33396C08G65/3322C04B24/2694C04B2103/302C08F220/06C08F216/04
Inventor 陈兴涛
Owner 陈兴涛
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