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A kind of preparation method of porous foam carbon material

A technology of porous foam and carbon material, applied in the field of preparation of porous foam carbon material, can solve the problems of high graphitization temperature, environmental hazards, limited effect, etc., and achieve the effect of high porosity and high degree of graphitization

Active Publication Date: 2022-05-06
中科优选新材料(浙江)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, nitrogen dioxide, as a nitrogen-containing compound, will form doping in the carbon skeleton, thereby affecting the purity of the foamed carbon material
Nitrogen dioxide, on the other hand, is a poisonous gas, and the nitrogen dioxide released during high-temperature processes may cause environmental hazards and poison to operators
In addition, a single iron element has limited effect in reducing the graphitization temperature
[0004] The production process of the existing porous carbon foam materials requires a higher graphitization temperature and higher energy consumption, and the prepared porous foam carbon has a higher density, thicker pore walls, and poor thermal conductivity

Method used

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  • A kind of preparation method of porous foam carbon material
  • A kind of preparation method of porous foam carbon material
  • A kind of preparation method of porous foam carbon material

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Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: a kind of preparation method of porous carbon foam material, comprises steps as follows:

[0037] (1) Preparation of mesophase pitch foam

[0038] Grind the mesophase pitch to 180 mesh, weigh 10g of the crushed mesophase pitch, add 0.8g of ferric chloride, 0.8g of sodium silicate, and 0.8mL of Tween 80, stir slowly until uniform, then add to the autoclave, Flush into nitrogen to replace the air in the autoclave, keep the pressure in the autoclave at 1.0 MPa, raise the temperature to 400 °C at a rate of 1.5 °C / min, maintain constant temperature and pressure conditions for 10 hours for self-foaming, and naturally cool to room temperature, A mesophase pitch foam is produced.

[0039] (2) Preparation of mesophase pitch foam carbon

[0040] Put the mesophase pitch foam in a tube furnace, program the temperature up to 1000°C at a rate of 1°C / min, and set the flow rate at 0.02m 3 Nitrogen gas was filled at a rate of 1.5 / h for protection, and the temperature wa...

Embodiment 2

[0047] Embodiment 2: a kind of preparation method of porous carbon foam material, comprises steps as follows:

[0048] (1) Preparation of mesophase pitch foam

[0049] Grind the mesophase pitch to 200 mesh, weigh 10g of the crushed mesophase pitch, add 1g of cobalt chloride, 1g of sodium silicate, and 1mL of Tween 80, stir slowly until uniform, then add to the high-pressure reactor, and flush with nitrogen Replace the air in the autoclave, keep the pressure in the autoclave at 1.5 MPa, raise the temperature to 500 °C at a rate of 2 °C / min, maintain constant temperature and pressure for 9 hours for self-foaming, and naturally cool to room temperature to obtain intermediate Phase asphalt foam.

[0050] (2) Preparation of mesophase pitch foam carbon

[0051]Put the mesophase pitch foam in a tube furnace, program the temperature up to 1200°C at a rate of 1.5°C / min, and set the flow rate at 0.04m 3 / h rate was filled with nitrogen for protection, continued heating for 17min and ...

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Abstract

The present invention provides a method for preparing a porous carbon foam material. The preparation method includes preparing mesophase pitch foam, preparing mesophase pitch foam carbon, and graphitization reaction; for preparing mesophase pitch foam, mesophase pitch, catalyst and The thickener self-foams to obtain mesophase asphalt foam; the catalyst is composed of a transition metal salt compound and a silicate; the transition metal salt compound is ferric chloride or cobalt chloride, and the silicate is sodium silicate. The porous foamed carbon material prepared by the present invention has a sharp graphitic carbon (002) diffraction peak around 26 degrees, and the foamed carbon material also has a relatively high degree of graphitization on the surface. When the porous foamed carbon material is prepared by the present invention, the graphitization temperature is relatively low at 1600-1800° C.; the foamed carbon material prepared by the present invention exhibits abundant spherical pores with thin pore walls and high porosity.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, in particular to a preparation method of a porous foam carbon material. Background technique [0002] Foam carbon is a lightweight carbon material with a porous network structure formed by carbon atoms as the skeleton and connected by carbon and carbon. It has high specific surface area, high temperature resistance, corrosion resistance, low density, high strength, high thermal conductivity and excellent adsorption performance. , has broad application prospects in the fields of thermal conduction and thermal control materials, microwave absorbing materials and microelectronics. In recent years, the emergence of mesophase pitch-based foam carbon has become another research hotspot of carbon materials. It is a new type of carbon with a ligament-type grid structure with low density, high thermal conductivity, high electrical conductivity, fire resistance, wave absorption, and thermal shock ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05
CPCC01B32/05
Inventor 林文添李良军
Owner 中科优选新材料(浙江)有限公司
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