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Viscosity reduction type ester polycarboxylic acid water reducer and preparation method thereof

A technology of ester polycarboxylic acid and water-reducing agent, which is applied in the field of concrete admixtures, can solve problems such as adverse effects on concrete strength, and achieve the effects of enhancing water retention, maintaining slump, and improving workability

Active Publication Date: 2022-03-04
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the existing water reducer has a viscosity-reducing effect and will adversely affect the concrete strength, the present invention provides a viscosity-reducing ester polycarboxylate water-reducer, including esterification products, ester large single body, acrylic acid, unsaturated sulfonate and functional monomer B;

Method used

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  • Viscosity reduction type ester polycarboxylic acid water reducer and preparation method thereof
  • Viscosity reduction type ester polycarboxylic acid water reducer and preparation method thereof
  • Viscosity reduction type ester polycarboxylic acid water reducer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042]A1. Preparation of esterification product: In parts by weight, add 156.3 parts of methacrylic acid and 100 parts of 4-hydroxyphenylboronic acid pinacid to the first reaction vessel and mix them. Under nitrogen protection conditions, add 6.4 parts of p-toluenesulfonic acid , 4.1 parts of methyl hydroquinone, and adjust the reaction temperature to 135 ° C, and react for 6 hours to obtain the esterified product;

[0043] A2, copolymerization reaction: by weight, first the esterification product that 1.5 parts of A1 make, 100 parts of polyethylene glycol dimethacrylates of molecular weight 2000, 1 part of (1-fluorovinyl) methyl diphenyl Base silane, 1.5 parts of sorbitol polyoxyethylene ether tetraoleate and 127 parts of water are added into the second reaction vessel and stirred evenly, and 2 parts of hydrogen peroxide and 20 parts of water are mixed uniformly in the first dropping device; 0.4 parts of ascorbic acid, 0.7 parts of mercaptoethanol and 20 parts of water are mi...

Embodiment 2

[0046] B1. Preparation of esterification product: In parts by weight, add 55.6 parts of acrylic acid and 100 parts of 4-hydroxyphenylboronic acid pinacaester into the first reaction vessel for mixing. Under nitrogen protection conditions, add 1.3 parts of concentrated sulfuric acid, 3.4 parts of aniline, and adjust the reaction temperature to 125°C, and react for 5 hours to obtain the esterification product;

[0047] B2, copolymerization reaction: in parts by weight, 3 parts of the esterification product prepared by B1, 100 parts of methoxypolyethylene glycol methacrylate with a molecular weight of 1200, 1.2 parts of (1-fluorovinyl) methyl Diphenylsilane, 0.8 parts of polyoxyethylene sorbitan tetraoleate and 123 parts of water are added to the second reaction vessel and stirred evenly, and 3.5 parts of sodium persulfate and 20 parts of water are mixed evenly in the first dropping device; 1.2 parts of sodium hypophosphite, 3 parts of n-dodecyl mercaptan and 20 parts of water ar...

Embodiment 3

[0050] C1, preparation of esterification product: in parts by weight, 101.6 parts of methacrylic acid and 100 parts of 4-hydroxyphenylboronic acid pinacidate were added to the first reaction vessel for mixing, and under nitrogen protection conditions, 3.4 parts of cerium sulfate were added, 6 Parts of diphenylamine, and adjust the reaction temperature to 120°C, and react for 4 hours to obtain the esterification product;

[0051] C2, copolymerization reaction: by weight, first the esterification product that 4.5 parts of C1 make, the polyethylene glycol acrylate of 100 parts of molecular weight 1500, 1.5 parts of (1-fluorovinyl) methyl diphenyl silane, 2 parts of sorbitol polyoxyethylene ether tetraoleate and 124 parts of water are added to the second reaction vessel and stirred evenly, and 3 parts of tert-butyl hydroperoxide and 20 parts of water are mixed evenly in the first dropping device; 0.9 parts 2-Hydroxy-2-sulfinic acid disodium salt, 1.5 parts of 3-mercaptopropionic a...

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Abstract

The invention relates to the field of concrete admixtures, in particular to a viscosity reduction type ester polycarboxylic acid water reducer and a preparation method thereof. The viscosity reduction type ester polycarboxylic acid water reducer comprises an esterification product, an ester macromonomer, acrylic acid, unsaturated sulfonate and a functional monomer B, the esterification product is prepared from a functional monomer A and unsaturated acid through esterification reaction, and the functional monomer A is a monomer with a benzene ring, borate and hydroxyl; the functional monomer B is a monomer with a silyl group, a double-benzene ring and a fluorocarbon bond structure. The self-made esterification product and (1-fluorovinyl) methyl diphenyl silane participate in the copolymerization reaction, the electronegativity of fluorine is relatively large, and organic fluorine is introduced, so that the hydrogen bonding degree of polycarboxylic acid molecules is increased, the crosslinking degree of the molecules is improved, the thickness of a hydration film is increased, and the lubricity among particles is improved. Meanwhile, the fluorocarbon structure has good hydrophobicity, free water can be better released, and the viscosity is reduced.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to a viscosity-reducing ester polycarboxylate water reducer and a preparation method thereof. Background technique [0002] In recent years, with the vigorous development of my country's construction industry, buildings tend to be large-scale and super-high-rise, and concrete has developed in the direction of high-strength, high-durability and other high-performance. The application of large-volume mineral admixture technology and concrete water The reduction of the rubber ratio leads to an increase in the viscosity of the concrete. In addition, due to the shortage of river sand resources, a large amount of machine-made sand has begun to be used in the preparation of concrete. The machine-made sand has many edges and corners and poor gradation, resulting in more prominent viscosity problems, which is not conducive to the pumping and construction of high-rise concrete. The strength...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F230/06C08F230/08C08F220/06C08F228/02C04B24/42C04B103/30
CPCC08F283/065C04B24/42C04B2103/302C08F230/065C08F230/085C08F220/06C08F228/02Y02W30/91
Inventor 林志君张小芳柯余良郭元强陈展华肖悦
Owner KZJ NEW MATERIALS GROUP CO LTD
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