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Preparation method of mud-resistant viscosity-reduction type polycarboxylic acidplasticizer

A viscous polycarboxylate and plasticizer technology, applied in the field of construction admixtures, can solve problems such as poor concrete construction performance, poor concrete work performance, and large slump loss, and achieve high water-reducing rate and low viscosity , Improve the effect of early strength

Active Publication Date: 2018-06-29
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the sand and gravel used in commercial concrete have high mud content. The use of such sand and gravel materials with high mud content will lead to poor concrete work performance or excessive slump loss, poor concrete construction performance and poor durability.

Method used

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  • Preparation method of mud-resistant viscosity-reduction type polycarboxylic acidplasticizer
  • Preparation method of mud-resistant viscosity-reduction type polycarboxylic acidplasticizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Esterification reaction: 196.00g hydroxyethyl acrylate, 100.00g 2-amino-4-methyl-5-phospho-3-pentenoic acid ethyl ester, 5.00g hydroquinone and 4.00g 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 blowing nitrogen with water. the first mixture of

[0024] (2) Copolymerization reaction: the first mixture that 10.00g step (1) makes, 200.00g molecular weight are 2400 TPEG and 100.00g water are added in the reaction kettle, stir until dissolving evenly, add dropwise sodium persulfate aqueous solution (wherein Sodium persulfate 1.40g, water 20.00g) sodium bisulfite aqueous solution (wherein sodium bisulfite 1.00g, water 20.00g), trisodium phosphate aqueous solution (wherein trisodium phosphate 1.50g, water 20.00g), acrylic acid and 3- The aqueous solution of trimethylsilyloxy-2-butenoic acid methyl ester (wherein acrylic acid 20.00g, 3-trim...

Embodiment 2

[0027] (1) Esterification reaction: 208.00g hydroxyethyl methacrylate, 100.00g 2-amino-4-methyl-5-phospho-3-pentenoic acid ethyl ester, 3.70g phenothiazine and 1.50g ethylenediamine Mix tetraacetic acid, under the protection of nitrogen, raise the temperature to 65°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. the first mixture of hydroxyethyl esters;

[0028] (2) Copolymerization reaction: Add 8.00g of the first mixture prepared in step (1), 200.00g of HPEG with a molecular weight of 2400 and 100.00g of water into the reactor, stir until it dissolves evenly, and dropwise add azodicyanopentyl Aqueous acid solution (including 1.60g of azodicyanovaleric acid and 20.00g of water), aqueous mercaptoethanol solution (of which 1.80g of mercaptoethanol and 20.00g of water), methacrylic acid and methyl 3-(trimethyls...

Embodiment 3

[0031](1) Esterification reaction: 248.00g hydroxypropyl acrylate, 100.00g 2-amino-4-methyl-5-phospho-3-pentenoic acid, 5.00g hydroquinone and 4.20g 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 first mixture containing the esterification product and unreacted hydroxypropyl acrylate. ;

[0032] (2) Copolymerization reaction: 11.00g of the first mixture prepared in step (1), 200.00g of APEG with a molecular weight of 2400 and 100.00g of water were added to the reactor, stirred until dissolved evenly, and aqueous hydrogen peroxide (wherein hydrogen peroxide 1.20 g, water 20.00g), ascorbic acid aqueous solution (including ascorbic acid 0.80g, water 20.00g), trisodium phosphate (including trisodium phosphate 3.00g, water 20.00g), maleic anhydride and 3-trimethylsil...

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Abstract

The invention discloses a preparation method of a mud-resistant viscosity-reduction type polycarboxylic acidplasticizer. The method comprises the following steps of (1) carrying out esterification reaction;(2) carrying out copolymerization reaction;(3) carrying out neutralization reaction. According to the preparation method provided by the invention, an unsaturated hydroxy ester and a compound Aare esterified, an unsaturated monomer with a phosphate group, an ester group and an amino group simultaneously is prepared and is then copolymerized and synthesized with excessive unsaturated hydroxyester in esterification, unsaturated carboxylic acid or unsaturated carboxylic acid anhydride and unsaturated silicon-containing small monomer, and a carboxy group, the phosphate group, the amino group, a silicon oxygen group, the ester group and a hydroxyl group are introduced into a molecular structure of the product, so that under a synergistic effect of various groups, the polycarboxylic acidplasticizer provided by the invention has higher water-reducing rate and a high slump loss resistant property.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and in particular relates to a preparation method of a mud-resistant and viscosity-reducing polycarboxylic acid plasticizer. Background technique [0002] Polycarboxylate superplasticizer has become the most important product in the current concrete admixture market due to its advantages such as low dosage, high water reducing rate, good slump retention, strong molecular structure adjustability, and environmental protection. 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 adva...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F283/06C08F220/34C08F220/20C08F230/08C08F220/06C04B103/30
CPCC04B24/2694C04B2103/30C08F283/065C08F220/34C08F220/20C08F230/08C08F220/06
Inventor 官梦芹郭鑫祺李祥河蒋卓君陈晓彬林添兴麻秀星
Owner KZJ NEW MATERIALS GROUP CO LTD
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