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Amphoteric phosphonate water reducing agent as well as preparation method and application thereof

A technology of amphoteric phosphonate and water reducing agent, which is applied in the field of concrete admixtures, can solve the problems of inferior sand aggregate and poor adaptability of machine-made sand.

Active Publication Date: 2022-06-21
BOTE NEW MATERIALS TAIZHOU JIANGYAN CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problem of poor adaptability of existing polycarboxylate water-reducers to inferior sandstone aggregates and machine-made sands, the present invention provides an amphoteric phosphonate water-reducer and a preparation method thereof. The amphoteric phosphonate water-reducer At the same time, it contains positively charged quaternary ammonium salt groups and negatively charged phosphonate groups, which can be adsorbed on the surface of positively and negatively charged cement and montmorillonite particles at the same time, and inhibit the superplasticizer from forming in the montmorillonite layer. The superplasticizer of the present invention has good clay resistance, dispersion performance and slump retention performance

Method used

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  • Amphoteric phosphonate water reducing agent as well as preparation method and application thereof
  • Amphoteric phosphonate water reducing agent as well as preparation method and application thereof
  • Amphoteric phosphonate water reducing agent as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0061] Add 168.5g PE1 polyether, 29g N1 quaternary ammonium salt monomer, and 60g P1 phosphonic acid monomer into a 500mL three-necked flask, heat to 80°C, stir the polyether after melting, add 20g sulfuric acid, the temperature rises to 130°C, dropwise Add 32.4 g of 37wt% formaldehyde aqueous solution, react for 5h; dilute with water and neutralize with 30wt% sodium hydroxide aqueous solution to pH=5.0 to obtain water reducing agent S1, and its molecular weight is Mn=16865.

Embodiment 2

[0063] In a 500mL three-necked flask, add 211.8g of PE2 polyether, 24.4g of N2 quaternary ammonium salt monomer, and 43.6g of P2 phosphoric acid monomer, heat to 80°C, stir the polyether after melting, add 42g of sulfuric acid, and the temperature rises to 120°C, 42.5g of benzaldehyde was added dropwise, and the reaction was carried out for 8h. After diluting with water, neutralize with 30wt% sodium hydroxide aqueous solution to pH=5.0 to obtain water reducing agent S2, and its molecular weight is Mn=15668.

Embodiment 3

[0065] In a 500mL three-necked flask, add 185.6g of PE3 polyether, 16.5g of N3 quaternary ammonium salt monomer, and 63.8g of P1 phosphonic acid monomer, heat to 80°C, stir the polyether after melting, add 26.6g of phosphoric acid, and the temperature rises to 90 ℃, 32.7 g of aqueous formaldehyde solution (37 wt %) was added dropwise, and the reaction was carried out for 5 h. After diluting with water, neutralize with 30wt% sodium hydroxide aqueous solution to pH=5.0 to obtain water reducing agent S3, and its molecular weight is Mn=13492.

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Abstract

The invention discloses an amphoteric phosphonicate water reducing agent as well as a preparation method and application thereof. The water reducer has a polyether side chain, and the main chain of the polyether side chain simultaneously contains a positively charged quaternary ammonium salt adsorption group and a negatively charged phosphonate adsorption group; the amphoteric phosphonate water reducing agent is obtained by carrying out phenolic aldehyde condensation reaction on a quaternary ammonium salt monomer, a phosphonate monomer and a polyether monomer with an aldehyde monomer under the catalysis of acid. The reaction conditions are simple and easy to operate, and the obtained water reducing agent is stable in structural performance; the prepared amphoteric phosphonate water reducing agent has good anti-clay performance, dispersing performance and slump retaining performance. The phosphonate water reducing agent can be independently used and can also be compounded with other water reducing agents on the market for use.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, in particular to an amphoteric phosphonate water reducer with good clay resistance and a preparation method and application thereof. Background technique [0002] Concrete admixture is one of the indispensable components of modern concrete and an important method and technology for concrete modification. Water reducing agent is the most widely used concrete admixture. The addition of water reducing agent can reduce the amount of water in the concrete mixing process, improve the working performance of concrete, and improve the strength and durability of concrete. As the third-generation high-performance water-reducing agent, polycarboxylate water-reducing agent is adsorbed on the surface of positively charged cement components and hydration products through the main chain containing carboxyl groups, and the long side chain of polyether provides steric resistance, making cement particles dispers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/28C04B24/30C04B103/30C04B103/40
CPCC08G8/28C04B24/243C04B2103/302C04B2103/408
Inventor 王兵冉千平王涛俞寅辉陆家越韩正马建峰夏正奕李显张丽辉
Owner BOTE NEW MATERIALS TAIZHOU JIANGYAN CO LTD