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Modified melamine-based water reducer and preparation method thereof

A technology of melamine-based water-reducing agent, which is applied in the field of chemical building materials, can solve the problems of inability to significantly improve the performance of concrete, poor adaptability of melamine-based water-reducing agent, and rapid loss of slump-preserving performance, etc., and achieve strong cement and Sulfate environmental adaptability, low sensitivity to clay and sulfate, and wide market application space

Active Publication Date: 2018-01-23
JIANGSU SOBUTE NEW MATERIALS +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The existing melamine-based water-reducers have problems such as rapid loss of slump-preserving performance, inability to significantly improve concrete performance, and complicated preparation process, etc., and the quality of concrete raw materials in the market is getting worse and worse. Today’s melamine-based water-reducers However, there are limitations in the modification research ideas, resulting in the poor adaptability of melamine-based water reducers to various concrete raw materials

Method used

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  • Modified melamine-based water reducer and preparation method thereof
  • Modified melamine-based water reducer and preparation method thereof
  • Modified melamine-based water reducer and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0062] (1) Preparation of Monomer A

[0063] Put 126.05g (1.0mol) of melamine, 90.20g (1.1mol) of phosphorous acid and 100ml of water into a 2000ml reaction bottle, add 49.02g (0.5mol) of sulfuric acid, raise the temperature to 100°C, keep it for 10min, then add 37% formaldehyde dropwise Aqueous solution 93.24g (1.15mol), installed a condenser, heated to reflux for 3h, after cooling, set aside.

[0064] (2) Condensation reaction

[0065] Add 27.60 g (0.2 mol) of monomer C (p-hydroxybenzoic acid), and then dropwise add 162.16 g (2.0 mol) of 37% formaldehyde solution, and keep the reaction at 80° C. for 4 hours.

[0066] (3) Neutralization and reorganization

[0067] Add 460.01 g (3.45 mol) of 30% sodium hydroxide solution to adjust the pH of the system to 8-9 to obtain a melamine-based water-reducer with a weight concentration of 34.4%, which is a light brown transparent viscous liquid, as determined by aqueous gel chromatography The polycondensate weight average molecular w...

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Abstract

The invention discloses a modified melamine-series water-reducing agent and a method for preparing the same. Phosphorylated melamine derivatives are used as main adsorption radicals of the modified melamine-series water-reducing agent instead of the traditional carboxyl and sulfonyl. The modified melamine-series water-reducing agent and the method have the advantages that the modified melamine-series water-reducing agent is excellent in comprehensive performance, is particularly high in cement adaptability and low in clay and sulfate sensitivity, and accordingly the modified melamine-series water-reducing agent and the method have broad market application spaces.

Description

technical field [0001] The invention belongs to the field of chemical building materials, and relates to a modified melamine-based water reducer and a preparation method thereof. Background technique [0002] Melamine-based water reducer, the chemical name is melamine-formaldehyde condensation polymer, which is a water-soluble polymer resin. It is used in concrete mixtures and has good cement dispersibility, remarkable early strength effect, and good concrete surface finish. , basically does not affect the concrete setting time and air content and other characteristics, especially suitable for the production of prefabricated concrete. However, the traditional melamine-based water-reducing agent has insufficient water-reducing rate, rapid slump loss, high raw material prices, complex production process, and poor storage stability, which severely limit the application of melamine-based water-reducing agents. In order to solve these shortcomings , A large number of modificatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G14/09C08G12/36C08G12/34C08G12/40C04B24/30C04B24/16C04B103/30
CPCC04B24/166C04B24/243C04B2103/302C08G12/34C08G12/36C08G12/40C08G14/06
Inventor 王涛亓帅刘加平杨勇马建峰范士敏宋峰岩
Owner JIANGSU SOBUTE NEW MATERIALS