Thermally conductive carbon material and preparation method thereof

A technology of carbon materials and coal liquefied pitch, which is applied in the field of heat-conducting carbon materials and its preparation, can solve the problems of low compressive strength of products, high processing temperature, and easy expansion and cracking of molds, so as to reduce mold expansion and cracking rate, increase yield and Compressive strength, easy release effect

Active Publication Date: 2021-06-22
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a heat-conducting carbon material and a preparation method thereof in order to overcome the problems of high processing temperature, easy mold expansion and cracking, low yield, and low compressive strength of the obtained product in the preparation process of the prior art. The advanced thermal conductive carbon material has the advantages of low temperature processing, cost saving, mold is not easy to swell, high product yield, high compressive strength

Method used

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preparation example Construction

[0021] The first aspect of the present invention provides a method for preparing a thermally conductive carbon material, wherein the method includes the following steps:

[0022] (1) Coal liquefied pitch is polymerized and ground to obtain coal liquefied pitch powder;

[0023] (2) Stabilizing the coal liquefaction pitch powder to obtain stabilized coal liquefaction pitch powder;

[0024] (3) Mixing 30-85% by weight of natural flake graphite and 15-70% by weight of the stabilized coal liquefied pitch powder, and performing hot pressing and demoulding to obtain a heat-conducting carbon material.

[0025] In the present invention, coal liquefaction pitch refers to the extract obtained after solvent extraction of coal liquefaction residue. Deashing (ash content) and desulfurization are carried out during the extraction process, which can effectively separate asphalt-like substances from ash and sulfur. Among them, the coal liquefaction residue is a by-product of the direct coal ...

Embodiment approach

[0026] According to an embodiment of the present invention, the softening point of the coal liquefaction pitch may be but not limited to 100-200°C, and the ash content may be but not limited to 0.02-2 wt%.

[0027] According to another embodiment of the present invention, the composition of the coal liquefied pitch contains 82-95% by weight of C element, 1-7% by weight of H element, 0.2-2% by weight of N element, 2-8% by weight % O element and 0.1-1 wt% S element.

[0028] According to the method of the present invention, the purpose of the polymerization conditions is to solidify the coal liquefied bitumen. The polymerization conditions may include but not limited to: the polymerization temperature is 350-460°C, and the polymerization time is 3-30h. In a preferred embodiment of the present invention, N 2 Protected against oxidation of coal liquefaction bitumen.

[0029] According to the method of the present invention, the particle size of the coal liquefaction pitch powde...

preparation example 1

[0042] The coal liquefaction residue is extracted with a medium oil extractant to obtain a coal liquefaction pitch, wherein the coal liquefaction pitch has a softening point of 150° C. and an ash content of 0.02% by weight.

[0043] The composition of the coal liquefied pitch contains 91% by weight of C elements, 6% by weight of H elements, 1.5% by weight of N elements, 1.1% by weight of O elements and 0.4% by weight of S elements.

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Abstract

The invention relates to the field of graphite materials, and discloses a heat-conducting carbon material and a preparation method thereof. A method for preparing a heat-conducting carbon material, comprising the following steps: (1) polymerizing and grinding coal liquefied pitch to obtain coal liquefied pitch powder; (2) stabilizing the coal liquefied pitch powder to obtain stabilized coal liquefied pitch Asphalt powder; (3) mixing 30-85% by weight of natural flake graphite with 15-70% by weight of the stabilized coal liquefied asphalt powder, and performing hot pressing and demoulding to obtain a heat-conducting carbon material. The heat-conducting carbon material prepared by the method has the advantages of low-temperature processing, cost saving, difficult mold expansion and cracking, high product yield and high compressive strength.

Description

technical field [0001] The invention relates to the field of graphite materials, in particular to a heat-conducting carbon material and a preparation method thereof. Background technique [0002] With the rapid development of the electronics and optoelectronics industries, the importance of thermally conductive materials has become more prominent. The ability to quickly conduct heat away from hot spots has played a key role in the development of its applications. Due to problems such as high density and large thermal expansion coefficient, traditional heat-conducting materials have been difficult to meet the growing demand for heat dissipation. The thermal conductive carbon material has the advantages of low density, low thermal expansion coefficient, corrosion resistance and high thermal conductivity, and has become a research hotspot and has achieved many results. [0003] CN101538036A discloses a method for preparing a high thermal conductivity graphite material. Specif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05C04B26/26C04B35/52
CPCC04B26/26C04B35/52C04B35/522C04B2201/32C04B2201/50C04B2235/48C04B2235/96C04B2235/9607C04B14/024
Inventor 郑冬芳刘均庆梁朋梁文斌
Owner CHNA ENERGY INVESTMENT CORP LTD
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