Heat-conducting graphite paper and preparation method thereof

A technology of thermally conductive graphite and flake graphite, applied in graphite, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of low thermal conductivity of thermally conductive paper and difficulty in meeting the technical application requirements of high-power electronic products, and achieve low cost and increased surface area. The effect of smoothness and simple process

Inactive Publication Date: 2018-06-22
乌兰察布市大盛石墨新材料股份有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the thermal conductivity of the existing thermal paper produced from natural graphite is low (280W/m·k~300W/m·k), and

Method used

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  • Heat-conducting graphite paper and preparation method thereof
  • Heat-conducting graphite paper and preparation method thereof
  • Heat-conducting graphite paper and preparation method thereof

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[0015] The invention provides a preparation method of heat-conducting graphite paper. The preparation method comprises the following steps:

[0016] S1, mixing graphite flakes with concentrated sulfuric acid solution, performing an oxidation reaction to obtain a first mixture, wherein the mass ratio of graphite flakes to concentrated sulfuric acid solution is 1:(2.5~3.0), and the sulfuric acid in the concentrated sulfuric acid solution The mass fraction is 95% to 98%;

[0017] S2, adding an oxidizing agent to the first mixture to perform an oxidative intercalation reaction to obtain a second mixture, wherein the oxidizing agent is a nitric acid solution, and the mass ratio of the nitric acid solution to the flake graphite is 1:5 to 1: 10. The mass fraction of nitric acid in the nitric acid solution is 50% to 68%;

[0018] S3, washing the second mixture with water to obtain a preform;

[0019] S4, placing the preform in a chamber, firstly evacuating the chamber, then introdu...

Embodiment (1

[0035] The preparation method of heat-conducting graphite paper described in this embodiment comprises the following steps:

[0036] (1) The graphite ore is purified and pulverized to obtain flake graphite. Put flake graphite and concentrated sulfuric acid solution in a mixer for 15 minutes, wherein the mass of flake graphite is 150±5Kg, the quality of concentrated sulfuric acid solution is 378±5Kg, and the sulfuric acid concentration is 98%.

[0037] (2) Pour 30±0.5Kg of nitric acid solution with a mass fraction of about 58% into the mixer, stir for 30 minutes, and let stand for 60 minutes to obtain the second mixture.

[0038] (3) washing the second mixture with water until the pH value is 6-7, and drying to obtain a preform.

[0039] (4) The preform is placed in a chamber, the chamber is first evacuated, and then an inert gas composed of nitrogen and helium with a volume ratio of 95:5 is continuously introduced into the chamber. The feed rate of the inert gas is 3×10 6 s...

Embodiment (2

[0059] The preparation method of heat-conducting graphite paper described in this embodiment comprises the following steps:

[0060] (1) The graphite ore is purified and pulverized to obtain flake graphite. The graphite flakes and the concentrated sulfuric acid solution are placed in a mixer for 10 minutes, wherein the graphite flakes have a mass of 150±5Kg, and the concentrated sulfuric acid solution with a mass fraction of about 95% has a mass of 420±5Kg.

[0061] (2) 20±0.5Kg of nitric acid solution with a mass fraction of about 68% was injected into the mixer, stirred for 30 minutes, and left to stand for 50 minutes to obtain the second mixture.

[0062] (3) washing the second mixture with water until the pH value is 6-7, and drying to obtain a preform.

[0063] (4) The preform is placed in a chamber, the chamber is first evacuated, and then an inert gas composed of nitrogen and helium with a volume ratio of 90:10 is continuously introduced into the chamber. The feed rat...

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Abstract

The invention relates to a preparation method of heat-conducting graphite paper. The preparation method comprises the following steps: mixing flake graphite with a concentrated sulfuric acid solutionto obtain a first mixture; adding an oxidizing agent into the first mixture for carrying out an oxidative intercalation reaction so as to obtain a second mixture; washing the second mixture to obtaina prefabricate product; putting the prefabricate product into a chamber, first vacuumizing the chamber and then introducing inert gas into the chamber, and carrying out high temperature expansion treatment to obtain an expanded graphite material; rolling the expanded graphite material for at least once to obtain the heat-conducting graphite paper. The invention also provides the heat-conducting graphite paper.

Description

technical field [0001] The invention relates to graphene materials, in particular to a heat-conducting graphite paper and a preparation method thereof. Background technique [0002] Since 2010, artificial graphite has been used as a raw material to prepare heat-conducting graphite paper in batches, and it is used as a heat dissipation application for electrical and electronic products. Later, with the improvement of the power of electronic products, people began to use artificial graphite graphite paper with high thermal conductivity (thermal conductivity above 1500W / m·k), which is used for consumer electronic products such as flat-screen TVs, smart phones, and notebook computers. Efficient heat dissipation. However, the cost of preparing thermally conductive graphite paper from artificial graphite is relatively high. [0003] Therefore, due to cost considerations, people began to consider using natural graphite instead of some artificial graphite. However, the existing t...

Claims

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Application Information

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IPC IPC(8): C01B32/225C01B32/21
Inventor 董景刚安军伟时迎迎
Owner 乌兰察布市大盛石墨新材料股份有限公司
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