Mud-resistant water-retention polycarboxylic acid water reducing agent for machine-made sand concrete and preparation method of mud-resistant water-retention polycarboxylic acid water reducing agent

A technology for concrete and machine-made sand, applied in the field of building admixtures, can solve the problems of insufficient anti-mud and water-retaining properties of water-reducing agents, and achieve the effects of improving water-retaining effect, enhancing adhesion ability, and improving uniformity

Pending Publication Date: 2022-04-08
厦门市建筑科学研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to solve the problem of insufficient anti-mud and water-retaining performance of the water-reducing agent in the prior art, the present invention provides a kind of anti-mud and water-retaining polycarboxylate water-reducing agent for machine-made sand concrete. The copolymerization component includes ester macromonomer, unsaturated Monocarboxylic acid, and one or both of unsaturated esterified monomer and cross-linked anti-sludge monomer;

Method used

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  • Mud-resistant water-retention polycarboxylic acid water reducing agent for machine-made sand concrete and preparation method of mud-resistant water-retention polycarboxylic acid water reducing agent

Examples

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Comparison scheme
Effect test

Embodiment 1

[0047] (1) Preparation of caffeic acid-γ-cyclodextrin unsaturated esterification monomer: 100 parts of caffeic acid, 50 parts of γ-cyclodextrin, 1.5 parts of toluenesulfonic acid, 0.75 parts of N-nitroso-N- Phenylhydroxylamine aluminum and 15 parts of petroleum ether are added to a microwave reactor, heated to 100°C under 200W microwave power, and reacted for 70 minutes to obtain caffeic acid-γ-cyclodextrin unsaturated esterified monomer;

[0048] (2) Copolymerization: 85 parts of methoxypolyethylene glycol acrylate, 20 parts of acrylic acid and 20 parts of water are mixed to obtain a monomer mixed aqueous solution; 0.8 parts of ammonium persulfate is mixed with 30 parts of water to obtain an aqueous initiator solution; 1 part of 3-mercaptoacetic acid-2-methylhexyl ester is mixed with 30 parts of water to obtain chain transfer agent aqueous solution;

[0049] Put 1 part of caffeic acid-γ-cyclodextrin unsaturated esterification monomer and appropriate amount of water in a micro...

Embodiment 2

[0052] (1) Copolymerization reaction: Mix 75 parts of methoxypolyethylene glycol methacrylate, 16 parts of methacrylic acid, 3 parts of diethylene glycol diacrylate and 20 parts of water to obtain a monomer mixed aqueous solution; Sodium persulfate was mixed with 30 parts of water to obtain an aqueous initiator solution; 0.8 parts of 2,4-diphenyl-4-methyl-1-pentene was mixed with 30 parts of water to obtain an aqueous chain transfer agent solution;

[0053] Put an appropriate amount of water in a microwave reactor, heat it to 70°C under a microwave power of 300W, and add the monomer mixed aqueous solution, initiator aqueous solution and chain transfer agent aqueous solution dropwise at a constant temperature of 70°C; the addition is completed within 40 minutes The above monomer mixed aqueous solution, initiator aqueous solution and chain transfer agent aqueous solution; after the dropwise addition, continue to react for 30 minutes to obtain a copolymerized product;

[0054] (2...

Embodiment 3

[0056] (1) Preparation of caffeic acid-γ-cyclodextrin unsaturated esterification monomer: 100 parts of caffeic acid, 200 parts of γ-cyclodextrin, 6 parts of sodium bisulfate, 4.5 parts of N, N-dibutyl di Add copper thiocarbamate and 54 parts of toluene into a microwave reactor, heat to 120°C under 500W microwave power, and react for 40 minutes to obtain caffeic acid-γ-cyclodextrin unsaturated esterified monomer;

[0057] (2) Copolymerization reaction: Mix 65 parts of methoxypolyethylene glycol methacrylate, 12 parts of acrylic acid, 1 part of diethylene glycol diacrylate and 30 parts of water to obtain a monomer mixed aqueous solution; Potassium is mixed with 30 parts of water to obtain an aqueous initiator solution; 0.6 parts of 3-mercaptoacetic acid-2-methylhexyl ester is mixed with 30 parts of water to obtain an aqueous chain transfer agent solution;

[0058] Put 4 parts of caffeic acid-γ-cyclodextrin unsaturated esterification monomer and appropriate amount of water in a m...

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Abstract

The invention relates to the technical field of building admixtures, in particular to a mud-resistant water-retention polycarboxylic acid water reducing agent for machine-made sand concrete and a preparation method of the mud-resistant water-retention polycarboxylic acid water reducing agent. According to the mud-resistant water-retention polycarboxylic acid water reducer for the machine-made sand concrete, a copolymerization component comprises one or two of an ester macromonomer, unsaturated monocarboxylic acid, an unsaturated esterification monomer and a cross-linked mud-resistant monomer; wherein the unsaturated esterified monomer is mainly obtained by esterifying caffeic acid and gamma-cyclodextrin. The unsaturated ester monomer is synthesized, and the unsaturated ester monomer and the cross-linked anti-mud monomer are introduced into the polycarboxylic acid water reducer, so that the prepared water reducer has excellent anti-mud water retention performance.

Description

technical field [0001] The invention relates to the technical field of building admixtures, in particular to a mud-resistant and water-retaining polycarboxylate water reducer for machine-made sand concrete and a preparation method thereof. Background technique [0002] At present, in the field of engineering construction in my country, it has become the development trend of the concrete industry to replace natural sand with machine-made sand as concrete fine aggregate, and machine-made sand has been used in large areas across the country. As a fine aggregate for concrete, machine-made sand can not only solve the shortage of natural sand resources, but also reduce transportation costs and protect the environment. Compared with natural sand, machine-made sand has poor fluidity and cohesion in concrete due to its own physical and chemical properties (rough particle surface, many edges and corners, poor gradation and large surface energy), and it is easy to bleed and segregate. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F251/00C08F220/06C08F2/38C04B24/24C04B24/38C04B103/30
Inventor 赖广兴尹键丽麻秀星郭元强林添兴肖伟方云辉桂苗苗
Owner 厦门市建筑科学研究院有限公司
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