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Process of preparing asphalt carbon foam material

A technology of carbon foam and asphalt, which is applied in the field of preparation of pitch carbon foam materials, can solve the problems of low compressive strength, uneven structure, and low expansion ratio, and achieve high thermal and electrical conductivity, uniform pore size distribution, and open cell ratio high effect

Inactive Publication Date: 2007-11-07
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor compatibility between nitrogen and asphalt in the high-pressure nitriding method, the pore structure after foaming is uneven and the compressive strength is low
The self-foaming method is mainly foamed by asphalt cracking gas or foamed by adding a foaming agent. There are generally problems such as low cell opening rate, low foaming ratio, insufficient stretching of the cell wall, and low strength.
The hydrogenation process is complex, time-consuming, and costly, and also has the problem of poor material compatibility

Method used

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  • Process of preparing asphalt carbon foam material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Put 50g of coal tar pitch into a container, add 50ml of toluene solvent, place it in a high-pressure reactor and seal it, and protect it by vacuuming. Raise the temperature to 300°C at a heating rate of 5°C / min, and keep the temperature for 240min. Lower the temperature to 290°C, then deflate at a rate of 0.05MPa / s, and lower it to room temperature to produce bituminous foam with large porosity and uniform cells. Oxidation at 220°C for 600min, carbonization at 950°C for 120min, and graphitization at 2400°C for 120min, the final pitch foam carbon material can be obtained.

[0031] The prepared pitch foam carbon material has a bulk density of 0.5g / cm 3 , thermal expansion coefficient 5.2ppm / ℃, thermal conductivity 110~150w / mk, specific thermal conductivity 220~250(w / mk) / (g / cm 3 ), the porosity is 84%, and the cell diameter is 500-1000 μm.

Embodiment 2

[0033] Put 50 g of mesophase pitch into a container, add 50 ml of toluene solvent, place it in a high-pressure reactor and seal it, and protect it by vacuuming. Raise the temperature to 320°C at a heating rate of 5°C / min, and keep the temperature for 240min. Lower the temperature to 315°C, then deflate at a rate of 0.05MPa / s, and lower it to room temperature to produce asphalt foam with large porosity and uniform cells. Oxidation at 220°C for 600min, carbonization at 950°C for 120min, and graphitization at 2400°C for 120min, the final pitch foam carbon material can be obtained.

[0034] The prepared pitch foam carbon material has a bulk density of 0.2 to 0.3 g / cm 3 ;The thermal expansion coefficient is 3.5ppm / ℃, the thermal conductivity is 150~220w / mk, and the specific thermal conductivity is 200~240(w / mk) / (g / cm 3 ), the porosity is 90%, and the cell diameter distribution is 90-130 μm.

Embodiment 3

[0036] Put 50 g of mesophase pitch into a container, add 50 ml of toluene solvent, place it in a high-pressure reactor and seal it, and fill it with nitrogen for protection. Set the initial pressure to 3MPa, raise the temperature to 320°C at a heating rate of 5°C / min, and keep the temperature for 240min. Lower the temperature to 315°C, then deflate at a rate of 0.5 MPa / s, and lower it to room temperature to produce asphalt foam with large porosity and uniform cells. Oxidation at 220°C for 600min, carbonization at 950°C for 120min, and graphitization at 2400°C for 120min, the final pitch foam carbon material can be obtained.

[0037] The prepared pitch foam carbon material has a bulk density of 0.2 to 0.3 g / cm 3 ;The thermal expansion coefficient is 3.2ppm / ℃, the thermal conductivity is 150~240w / mk, and the specific thermal conductivity is 200~240(w / mk) / (g / cm 3 ), the porosity is 94%, and the average cell diameter is 97±5μm.

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Abstract

The present invention relates to the process of preparing asphalt carbon foam material. The process includes the following steps: 1. setting asphalt and solvent in a high pressure kettle, sealing, and vacuumizing or adding inert gas; 2. heating in the rate of 1-15 deg.c / min to 250-350 deg.c, maintaining at 250-350 deg.c and the pressure for 50-500 min; 3. opening the solenoid valve and needle valve to relieve in the rate of 0.05-1 MPa / s at 250-350 deg.c; 4. cooling to room temperature ; and 5. oxidizing the asphalt foam without smelting, carbonizing and high temperature graphitizing treatment. The process can prepare carbon material with high strength and high heat conductivity, and is simple, low in cost and suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of carbon material preparation, in particular to a preparation method of a pitch carbon foam material. Background technique [0002] Carbon foam materials are used in high temperature insulation, thermal shock resistance, heat conduction, stealth and supercapacitor electrode materials due to their advantages of high temperature resistance, corrosion resistance, thermal conductivity, light specific gravity, and large specific surface area. [0003] There are roughly three types of methods for preparing pitch-based carbon foam reported in the literature: [0004] 1 High pressure nitriding method [0005] Generally, the preparation method of foamed charcoal using asphalt as raw material is to form bubbles in the asphalt by feeding gas or releasing pressure in situ. Put the raw material in the mold, then put it into the high-pressure furnace, use inert gas (generally nitrogen) as the protective gas, and the pressure wil...

Claims

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Application Information

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IPC IPC(8): C01B31/02C01B31/04
Inventor 吕永根王鹏杨常玲秦显营辛诚曾凡龙舒练兵潘鼎
Owner DONGHUA UNIV
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