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Preparation method of enhanced viscosity reduction type polycarboxylic acid plasticizer

A plasticizer and polycarboxylic acid technology, applied in the field of construction admixtures, can solve the problems of high viscosity of freshly mixed concrete, frequent pumping accidents, difficult pumping, etc., achieve high water reduction rate, improve early strength and The effects of late strength and excellent slump retention

Active Publication Date: 2018-05-18
KZJ NEW MATERIALS GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at the same time, there are disadvantages of high viscosity
In order to achieve the purpose of high strength, the water consumption is extremely low, which will lead to high viscosity of fresh concrete, making pumping difficult and frequent pumping accidents

Method used

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  • Preparation method of enhanced viscosity reduction type polycarboxylic acid plasticizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Acylation reaction: Mix 514.00g of maleic anhydride, 100.00g of monoethanolamine, 5.00g of hydroquinone and 6.00g of periodic acid. Under the protection of nitrogen, heat up to 65°C and keep it warm for 4 hours. Or the method of logical nitrogen band water is removed water, after reaction finishes, be down to room temperature, obtain the first mixture that contains acylated product and unreacted maleic anhydride;

[0028] (2) Esterification reaction: 198.00g hydroxyethyl acrylate, 100.00g 2-amino-4-methyl-5-phospho-3-pentenoic acid ethyl ester, 5.20g hydroquinone and 4.20g dinitrobenzene Mix formic acid, under the protection of nitrogen, raise the temperature to 60°C and keep it warm for 3 hours. During this period, remove the water by vacuuming or nitrogen with water. the second mixture of

[0029] (3) Monomer blending: 18.00g of the first mixture prepared in step (1), 5.00g of the second mixture prepared in step (2), 4.00g of 3-trimethylsiloxy-2-butenoic acid Me...

Embodiment 2

[0033] (1) Acylation reaction: Mix 434.00g of acrylic acid, 100.00g of diethanolamine, 4.50g of phenothiazine and 5.30g of dinitrobenzoic acid. Under the protection of nitrogen, heat up to 60°C and keep it warm for 4 hours. During this period, use vacuum or Water is removed by nitrogen gas with water, and the reaction is cooled to room temperature after completion of the reaction to obtain the first mixture containing acylated product and unreacted acrylic acid;

[0034] (2) Esterification reaction: 249.00g hydroxypropyl acrylate, 100.00g 2-amino-4-methyl-5-phospho-3-pentenoic acid, 4.00g hydroquinone and 4.00g periodic acid were mixed, Under the protection of nitrogen, raise the temperature to 65°C and keep it warm for 2 hours. During this period, remove the water by vacuuming or blowing nitrogen with water. After the reaction, cool down to room temperature to obtain the second mixture containing the esterification product and unreacted hydroxypropyl acrylate. ;

[0035] (3)...

Embodiment 3

[0039] (1) Acylation reaction: Mix 290.00g of methacrylic acid, 100.00g of triethanolamine, 2.30g of diphenylamine and 3.00g of periodic acid. Under the protection of nitrogen, heat up to 70°C for 3 hours. The method of nitrogen band water is removed water, and after reaction finishes, be down to room temperature, obtain the first mixture that contains acylated product and unreacted methacrylic acid;

[0040] (2) Esterification reaction: 210.00g hydroxyethyl methacrylate, 100.00g 2-amino-4-methyl-5-phospho-3-pentenoic acid ethyl ester, 4.00g phenothiazine and 1.80g ethylenediamine Mix tetraacetic acid, under the protection of nitrogen, raise the temperature to 70°C and keep it warm for 2 hours. During this period, use vacuum or nitrogen with water to remove water. After the reaction, cool down to room temperature to obtain esterification products and unreacted methacrylic acid. A second mixture of hydroxyethyl esters;

[0041] (3) Monomer blending: 22.00g of the first mixture...

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Abstract

The invention discloses a preparation method of an enhanced viscosity reduction type polycarboxylic acid plasticizer. The method comprises the following steps of an acylation reaction, an esterification reaction, monomer blending, copolymerization and a neutralization reaction. According to the preparation method, unsaturated carboxylic acid or unsaturated carboxylic acid anhydride and hydramine are subjected to acylation, an unsaturated monomer with an amide group is prepared, unsaturated hydroxy esters and a compound A are esterfied, an unsaturated monomer with a phosphate group, an ester group and an amine group is prepared, and finally the unsaturated monomer and excess unsaturated carboxylic acid or unsaturated carboxylic acid anhydride in the acylation process, excess unsaturated hydroxy esters in the esterification process and an unsaturated silicon-containing small monomer are subjected to copolymerization; amide, a carboxy group, a phosphate group, the amine group, siloxy, theester group and a hydroxyl group are introduced into the molecular structure, under the synergistic effect of all the groups, the polycarboxylic acid plasticizer has the high water-reducing rate, theexcellent slump loss resistant property and the low sensitivity.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and in particular relates to a preparation method of an enhanced viscosity-reducing polycarboxylic acid plasticizer. Background technique [0002] With the development of society and the advancement of science and technology, human beings continue to expand their own living space. People are constantly developing into the sky, the ground and the ocean, forming a trend that modern buildings tend to be more high-rise, lightweight and long-span. All of these require the continuous improvement of concrete technology and production technology. Compared with ordinary concrete, high-strength concrete has the advantages of effectively improving the durability of concrete; reducing energy consumption and construction costs. But at the same time, it also has the disadvantage of high viscosity. In order to achieve the purpose of high strength, the water consumption is extremely low, which wil...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F230/08C08F222/06C08F222/02C08F220/06C08F220/20C08F230/02C08F222/38C08F220/58C04B24/26C04B103/30
CPCC04B24/2694C08F283/065C04B2103/32C08F230/08C08F220/58
Inventor 郭鑫祺官梦芹蒋卓君李祥河陈晓彬林添兴麻秀星
Owner KZJ NEW MATERIALS GROUP CO LTD
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