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Process for making graphite powder with electromagnetic property

A technology of electromagnetic properties and graphite, which is applied in the field of graphite powder preparation, can solve the problems of large particle size and difficulty in achieving shielding effect, and achieve the effect of simple preparation process, light weight and good application prospects

Inactive Publication Date: 2007-12-19
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Peng Junfang and others combined expanded graphite with Fe(OH) 3 Mixing, and then rapid expansion at high temperature, a graphite-based composite material containing ferrimagnetic iron oxide is prepared. The material has conductivity and ferrimagnetism, and its shielding performance is improved, especially the shielding bandwidth of the material is relatively Pure graphite has been greatly improved, but because the magnetic particles are ferrimagnetic and the particle size is large, it is difficult to achieve the ideal shielding effect

Method used

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  • Process for making graphite powder with electromagnetic property
  • Process for making graphite powder with electromagnetic property

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Weigh 0.5000g of 2000 mesh graphite to prepare 50ml of graphite alcohol dispersion; weigh 0.8341g of FeSO 4 .6H 2 O, 0.1622g FeCl 3 .7H 2 O is prepared into a mixed solution of 50ml iron salt.

[0024] 2) Pour the above two solutions into an open three-necked flask, place them in a water bath at 30° C., and stir with a stirrer for 15 minutes to make them evenly mixed.

[0025] 3) Add dropwise a NaOH solution with a concentration of 0.4 mol / l to the mixed solution obtained in step 2), and continuously stir the solution while adding the NaOH solution until the pH of the solution=12.

[0026] 4) Transfer the solution obtained in step 3) to a water bath at 50° C. for crystallization for 2 hours, and then wash the precipitate obtained after crystallization with distilled water for several times until the pH of the washing solution is 7.

[0027] 5) Use magnetic separation technology to separate the precipitate, dry the separated precipitate with a vacuum drying oven, ...

Embodiment 2

[0029] 1) Weigh 0.5000g7000 mesh graphite to prepare 50ml graphite alcohol dispersion, weigh 0.8341gFeSO 4 .6H 2 O, 0.1622g FeCl 3 .7H 2 O is prepared into a mixed solution of 50ml iron salt.

[0030] 2) Pour the above two solutions into an open three-necked flask, place them in a water bath at 30° C., and stir with a stirrer for 15 minutes to make them evenly mixed.

[0031] 3) Add NaOH solution with a concentration of 0.5 mol / l dropwise to the mixed solution obtained in step 2), and continuously stir the solution while adding the NaOH solution until the pH of the solution=13.

[0032] 4) The solution obtained in step 3) was transferred to a water bath at 35° C. for crystallization for 2 hours, and then the precipitate obtained after crystallization was washed with distilled water for several times until the pH of the washing solution was 7.

[0033] 5) Use magnetic separation technology to separate the precipitate, dry the separated precipitate with a vacuum drying oven,...

Embodiment 3

[0035] 1) Weigh 0.5000g nano-graphite to prepare 50ml graphite alcohol dispersion, weigh 0.8341gFeSO 4 .6H 2 O, 0.1622g FeCl 3 .7H 2 O is prepared into a mixed solution of 50ml iron salt.

[0036] 2) Pour the above two solutions into an open three-necked flask, place them in a 30°C water bath, and stir with a stirrer for 1 minute to make them evenly mixed.

[0037] 3) Add dropwise a NaOH solution with a concentration of 0.4 mol / l to the mixed solution obtained in step 2), and continuously stir the solution while adding the NaOH solution until the pH of the solution=12.

[0038] 4) Transfer the solution obtained in step 3) to a water bath at 50° C. for crystallization for 2 hours, and then wash the precipitate obtained after crystallization with distilled water for several times until the pH of the washing solution is 7.

[0039] 5) Use magnetic separation technology to separate the precipitate, dry the separated precipitate with a vacuum drying oven, and pulverize to obtai...

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Abstract

The invention discloses a graphite powder preparing method with electromagnetic feature, which comprises the following steps: mixing up homogeneously with carbite liquor and Fe2+ / Fe3+ mixed liquor; putting mixed liquor in conical flask installing in constant temperature water-bath; adding alkali liquor in mixed solution until the reacted liquor presents alkalinity; transforing the reacted liquor to another higher thermostatic water-bath for blooming for certain time. The method simplifies the manufacturing engineering, which reduces the producing cost.

Description

technical field [0001] The invention belongs to the technical field of powder preparation, and more specifically relates to a method for preparing graphite powder used for electromagnetic shielding and having conductivity and magnetic conduction. Background technique [0002] With the development of the electronics industry and science and technology, the widespread use of various electronic and electrical equipment and electronic products, the electromagnetic energy radiated by electromagnetic waves is gradually increasing at a rate of 7%-14% per year, and the pollution of the electromagnetic environment is becoming more and more serious. Another On the one hand, electronic products and electronic and electrical equipment are developing in the direction of digitalization, high integration, and miniaturization of signal levels. They are more sensitive to the external electromagnetic environment and are prone to malfunction, image distortion, and interference with radio commun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/536C04B35/626
Inventor 陈国华唐海涛
Owner HUAQIAO UNIVERSITY