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Magnetic powder, preparation method thereof and applications thereof

A magnetic powder and magnetic powder technology, applied in chemical instruments and methods, tungsten compounds, inorganic chemistry, etc., can solve the problems of poor sunshade effect and large particle size gap between powders, etc., with cheap methods and low production costs , good dispersion effect

Active Publication Date: 2014-06-25
SHENZHEN JIADA HIGH TECH IND DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the purpose of the present invention is to provide a magnetic powder, which solves the technical problems that the existing magnetic powder has poor sunshade effect and large particle size gap between powders.

Method used

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  • Magnetic powder, preparation method thereof and applications thereof
  • Magnetic powder, preparation method thereof and applications thereof
  • Magnetic powder, preparation method thereof and applications thereof

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preparation example Construction

[0021] The embodiment of the present invention further provides the above-mentioned magnetic powder preparation method, comprising the following steps:

[0022] Step S01, preparing raw materials:

[0023] Prepare a mixed solution containing sodium tungstate, sodium sulfate and citric acid, and adjust the pH value of the mixed solution to 0.5~7.0;

[0024] Step S02, reaction:

[0025] In a hydrothermal kettle, adjust the temperature of the system to 160-240° C. and react for 4-72 hours to obtain the magnetic powder.

[0026] In step S01, the mixed solution includes three solutes: sodium tungstate, sodium sulfate and citric acid, and its solvent is water. In the mixed solution, the concentration of sodium tungstate is 1~45g / 100ml, the concentration of sodium sulfate is 1~40g / 100ml, and the concentration of citric acid is 1~25g / 100ml, wherein the mass ratio of sodium tungstate to sodium sulfate is 0.5~2.5:1, the mass ratio of sodium tungstate to citric acid is 0.5~2.5:1. The ...

Embodiment 1

[0032] The method for preparing magnetic powder in the embodiment of the present invention comprises the following steps in turn:

[0033] (1) Dissolve 6g of sodium tungstate, 1g of sodium sulfate, and 1g of citric acid in 100ml of deionized water, add HCl, and adjust the pH to 0.5;

[0034] (2) Transfer the above precursor solution to a 120ml hydrothermal kettle, and react at 160°C for 72h;

[0035] (3) After natural cooling, a liquid containing blue precipitate was obtained. The blue precipitate was separated from the liquid by centrifugation, and then washed twice with water and twice with ethanol. Finally, the blue precipitate was vacuum-dried in a vacuum oven to obtain a sky-blue powder.

[0036] After testing, the obtained sky blue powder composition is Na 0.10 WO 3 , with an average particle size of 10nm.

[0037] refer to figure 1 , figure 1 Show the particle size distribution diagram of the magnetic powder prepared in Example 1 of the present invention, from f...

Embodiment 2

[0039] The method for preparing magnetic powder in the embodiment of the present invention comprises the following steps in turn:

[0040] (1) Dissolve 1g of sodium tungstate, 1.4g of sodium sulfate, and 1.5g of citric acid in 100ml of deionized water, add HCl, and adjust the pH to 2.5;

[0041] (2) Transfer the above precursor solution to a 120ml hydrothermal kettle, and react at 180°C for 24h;

[0042] (3) After natural cooling, a liquid containing blue precipitate was obtained. The blue precipitate was separated from the liquid by centrifugation, and then washed twice with water and twice with ethanol. Finally, the blue precipitate was vacuum-dried in a vacuum oven to obtain a sky-blue powder.

[0043] After testing, the obtained sky blue powder composition is Na 0.30 WO 3 , the average particle size is 35nm.

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Abstract

The invention is suitable for the field of novel materials, and provides magnetic powder. The chemical formula of the magnetic powder is NaxWO3, wherein the x is 0.10-0.49. The average particle size of the magnetic powder is 10-300 nm. According to a preparation method of the magnetic powder, synthesis under mild conditions is achieved by reaction of sodium tungstate, sodium sulfate and citric acid under aqueous conditions and by selection of specific reaction conditions. The method is cheap and efficient. The magnetic powder is low in production cost, small in particle size (10-300 nm), uniform in morphology, high in crystallization quality, and good in dispersibility.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to a magnetic powder, its preparation method and application. Background technique [0002] In the "Decision on Accelerating the Cultivation and Development of Strategic Emerging Industries" issued by the State Council, seven strategic emerging industries are defined as key developments, among which energy conservation and environmental protection are listed first, highlighting the national strategic position of "development of energy conservation and environmental protection industries". The "Twelfth Five-Year" national strategic emerging industry development plan lists the development of green buildings and the promotion of green building materials as the key development direction of national industries. In my country, nearly 1 / 3 of the total social energy consumption is building energy consumption, and building energy conservation has become the most important area for th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00
Inventor 杜靖关有俊熊永强
Owner SHENZHEN JIADA HIGH TECH IND DEV