Thermally conductive graphite paper and preparation method thereof

A technology of thermally conductive graphite and flake graphite, applied in the directions of graphite, chemical instruments and methods, and modification by conduction and heat transfer, etc., can solve the problems of low thermal conductivity of thermally conductive paper, difficult to meet the technical application requirements of high-power electronic products, etc., and achieve cost Low, increased surface smoothness, easy handling effect

Active Publication Date: 2020-12-29
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
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing thermal conductivity paper produced from natural graphite has a low thermal conductivity (280W / m·k), and it is still difficult to meet the technical application requirements of the rapidly developing high-power electronic products.

Method used

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  • Thermally conductive graphite paper and preparation method thereof
  • Thermally conductive graphite paper and preparation method thereof
  • Thermally conductive graphite paper and preparation method thereof

Examples

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preparation example Construction

[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 sulfuric acid solution to obtain a first mixture, wherein the mass ratio of graphite flakes to sulfuric acid solution is 1:2 to 1:3, and the mass fraction of sulfuric acid in the sulfuric acid solution is 58% to 65% %;

[0017] S2, adding potassium dichromate solution to the first mixture to obtain a second mixture, wherein the mass ratio of potassium dichromate powder to the flake graphite is 0.2:1 to 0.3:1;

[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 introducing an inert gas into the chamber, and performing high-temperature expansion treatment to obtain an expanded graphite material;

[0020] S5, rolling the expanded graphite material at least once to obtain thermally conductive graph...

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. The flake graphite and sulfuric acid solution are placed in the mixer for 15 minutes, wherein the quality of the flake graphite is 100±5Kg, the sulfuric acid concentration is about 65%, and the quality of the sulfuric acid solution used is 230±5Kg.

[0037] (2) Slowly add 25±0.5Kg of potassium dichromate powder with a content greater than 99% into the mixer, stir for 15 minutes, and let stand for 40 minutes to obtain the second mixture.

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

[0039] (4) Place the preform in the chamber, first evacuate the chamber, and then continuously pass into the chamber an inert gas composed of nitrogen, argon and hydrogen with a volume ratio of 94:5:1. gas, the rate of introduction...

Embodiment (2

[0060] The preparation method of heat-conducting graphite paper described in this embodiment comprises the following steps:

[0061] (1) The graphite ore is purified and pulverized to obtain flake graphite. The graphite flakes and the sulfuric acid solution are placed in a mixer for 10 minutes, wherein the graphite flakes have a mass of 100±5Kg, and the sulfuric acid solution with a mass fraction of about 50% has a mass of 250±5Kg.

[0062] (2) Slowly add 20±0.5Kg of potassium dichromate powder with a solid content greater than 99% into the mixer, stir for 10 minutes, and let stand for 30 minutes to obtain the second mixture.

[0063] (3) washing the second mixture with water until the pH value is 6, and drying to obtain a preform.

[0064] (4) Place the preform in the chamber, first evacuate the chamber, and then continuously pass into the chamber an inert gas composed of nitrogen, argon and hydrogen with a volume ratio of 94:5:1. gas. The feed rate of the inert gas is 3×1...

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Abstract

The invention relates to a preparation method of heat conducting graphite paper. The method comprises the following steps: mixing crystalline flake graphite with a sulfuric acid solution to obtain a first mixture; adding potassium dichromate powder into the first mixture to obtain a second mixture; washing the second mixture by using water to obtain a prefabricated product; placing the prefabricated product in a chamber, vacuumizing the chamber firstly, then introducing inert gas into the chamber and performing high-temperature expansion treatment to obtain an expanded graphite material; and carrying out rolling on the expanded graphite material at least once to obtain the heat conducting graphite paper. The invention further 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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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/21C01B32/225H05K7/20
CPCC01B32/21C01B32/225H05K7/2039
Inventor 安军伟冯向阳许培龙时迎迎
Owner 乌兰察布市大盛石墨新材料股份有限公司
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