Particle type phosphonic acid-based super plasticizer, and preparation method and application thereof

A superplasticizer, phosphonic acid-based technology, applied in the field of concrete admixtures, can solve the problems of difficulty in maintaining the fluidity of concrete in the later stage, and achieve the effects of good water-reducing performance, high efficiency and short time.

Pending Publication Date: 2022-07-01
NANJING BOTE BUILDING MATERIALS CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problem that it is difficult to maintain the fluidity of concrete in the later stage caused by the deterioration of sand and gravel aggregates, the present invention provides a particle-type phosphonic acid-based superplasticizer with excellent water-reducing and slump-preserving properties. It has universal applicability to engineering, and is es

Method used

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  • Particle type phosphonic acid-based super plasticizer, and preparation method and application thereof
  • Particle type phosphonic acid-based super plasticizer, and preparation method and application thereof
  • Particle type phosphonic acid-based super plasticizer, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] (1) Preparation of polymer I: In a 1L four-necked flask equipped with a thermometer and a mechanical stirrer, add Monomer A-1 (0.2mol, 280g), Monomer B-1 (0.25mol, 62g), Monomer A-1 (0.25mol, 62g), Body C-1 (0.02mol, 3.46g) was stirred evenly, then slowly added concentrated sulfuric acid (0.494mol, 49.4g), after mixing uniformly, the temperature was raised to 120 ° C, and 37wt% formaldehyde solution ( 0.494mol, 40.1g), the dropwise addition time was 4h, and after the dropwise addition was completed, the reaction was incubated for 1h to obtain the aromatic polymer I rich in phosphonic acid groups;

[0059] (2) Preparation of polymer II: In a 1L four-necked flask equipped with a thermometer and a mechanical stirrer, add monomer F-1 (0.2mol, 190g) and 300g of water and stir to dissolve, then under vigorous stirring, the benzene Ethylene (0.2mol, 20.8g) and polymer I (57g) prepared in step (1) were slowly dropped into the reaction flask to form a stable emulsion, and then 3...

Embodiment 2

[0061] (1) Preparation of Polymer I: In a 1L four-necked flask equipped with a thermometer and a mechanical stirrer, add Monomer A-2 (0.2mol, 250g), Monomer B-2 (0.3mol, 65.4g), Monomer C-2 (0.06mol, 7.26g) was stirred uniformly, then slowly added concentrated sulfuric acid (0.6mol, 60g), after mixing uniformly, the temperature was raised to 150 ° C, and 37wt% formaldehyde solution ( 0.6mol;

[0062] (2) Preparation of polymer II: In a 1L four-necked flask equipped with a thermometer and a mechanical stirrer, monomer F-2 (0.1mol, 240g) and 360g of water were added and stirred to dissolve, then under vigorous stirring, the benzene Ethylene (0.1mol, 10.4g) and polymer I (60g) prepared in step (1) were slowly dropped into the reaction flask to form a stable emulsion, and then 30wt% hydrogen peroxide (0.012mol, 1.36g) was added. ), the reaction system was heated up to 50°C, and then acrylic acid (0.4mol, 28.8g), and a solution composed of L-ascorbic acid (0.003mol, 0.53g) and wat...

Embodiment 3

[0064] (1) Preparation of polymer I: In a 1L four-necked flask equipped with a thermometer and a mechanical stirrer, add Monomer A-3 (0.2mol, 280g), Monomer B-3 (0.4mol, 130g), Monomer A-3 (0.4mol, 130g), Body C-3 (0.06mol, 10.4g) was stirred evenly, then slowly added concentrated sulfuric acid (0.726mol, 72.6g), after mixing uniformly, the temperature was raised to 125 ° C, and 37wt% formaldehyde solution ( 0.726mol;

[0065] (2) Preparation of polymer II: In a 1L four-necked flask equipped with a thermometer and a mechanical stirrer, monomer F-3 (0.1mol, 250g) and 165g of water were added with stirring to dissolve, and then under vigorous stirring, the benzene Ethylene (0.1mol, 10.4g) and polymer I (87.5g) prepared in step (1) were slowly dropped into the reaction flask to form a stable emulsion, and then 30wt% hydrogen peroxide (0.008mol, 0.91 g) was added. g), the reaction system was heated to 45°C, and then acrylic acid (0.2mol, 14.4g), and a solution composed of L-ascor...

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Abstract

The invention discloses a particle type phosphonic acid-based super plasticizer, and a preparation method and application thereof. The particle type phosphate polymer is composed of polymer particles and water, the polymer particle is a core-shell structure nanoparticle formed by self-assembling polymers rich in phosphonic acid groups, carboxylic acid groups, phenyl groups and ether groups in water, a core layer of the polymer particle is composed of a hydrophobic aromatic polymer rich in phosphonic acid groups, and a shell layer of the polymer particle is a hydrophilic polycarboxylic acid comb-shaped polymer. The superplasticizer is good in water reducing performance, the slump retaining performance of the superplasticizer is far better than that of a common polycarboxylic acid superplasticizer, the mixing amount of the superplasticizer can be effectively reduced when the superplasticizer is applied to actual engineering, and cost is saved; a one-pot method is adopted in the preparation process, efficiency is high, time is short, no organic solvent is used, environment friendliness is achieved, and large-scale production is easy to achieve; compared with the conventional polycarboxylic acid superplasticizer, the superplasticizer disclosed by the invention can keep the initial and later fluidity of concrete at an excellent level under the condition of a relatively low mixing amount.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a particle-type phosphonic acid-based superplasticizer, a preparation method and application thereof. [0002] technical background [0003] Polycarboxylate superplasticizer is one of the most widely studied and used concrete admixtures at present. Under the condition that the workability of concrete remains unchanged, adding polycarboxylate superplasticizer can effectively save the amount of cement and water. , Improve the strength of concrete. In terms of molecular structure, polycarboxylic acid is a comb-shaped polymer, which consists of a main chain rich in carboxylic acid groups and polyether side chains. The surface of the cement or cement hydrate, and the polyether side chain stretches in the solution to form a hydration layer to provide steric repulsion to prevent cement agglomeration, so this structure endows the polycarboxylate with a strong ability to dispe...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F212/08C08F220/06C08F222/08C04B24/26C04B103/32
CPCC08F283/065C08F283/06C04B24/246C04B2103/32C08F212/08C08F220/06C08F222/08C08F222/02
Inventor 李申桐冉千平周栋梁王涛夏正奕毛永琳陆加越刘红李炜
Owner NANJING BOTE BUILDING MATERIALS CO LTD
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