Method for preparing new-type carbon foam material

A carbon foam, a new type of technology, applied in the field of preparation of new carbon foam materials, can solve the problems of poor mixing uniformity, poor pore distribution and uniformity, poor uniformity of carbon foam material functions, etc., to achieve uniform foaming cells and performance Excellent and safe effect

Inactive Publication Date: 2006-05-24
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, due to the poor mixing uniformity of the two materials in the above method, the distribution and uniformity of the pores formed thereby are poor, so that the uniformity of the function of the carbon foam material is also poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The carbon dioxide addition section is set at approximately the middle position of the extruder with a screw diameter of 50 mm. Asphalt pellets are 0.5cm 3 It is added to the extruder through a hopper, and then heated and melted at a temperature of 220°C in the heating zone.

[0024] The carbon dioxide is supplied directly from the liquid phase from the liquefied carbon dioxide cylinder. A 15°C ethylene glycol aqueous solution cooling medium circulator is used to cool the pipeline from the liquefied carbon dioxide cylinder to the delivery pump. Then control the feeding rate of liquefied carbon dioxide of the delivery pump to 1 kg / hour, and the pressure of the delivery pump is adjusted to 7.4 MPa through the pressure control valve. The pipeline from the pressure control valve to the carbon dioxide addition section between the extruder is insulated with a heater to maintain its temperature at 50°C. Add carbon dioxide to the molten pitch in the extruder. At this time, the pres...

Embodiment 2

[0033] It is carried out in a similar manner to Example 1, except that the delivery pump is controlled to output carbon dioxide at 1.8 kg / h. Supercritical carbon dioxide was added to the extruder at a ratio of 30 parts by weight per 100 parts by weight of molten pitch, and they were mixed into a uniform mixture. The mixture was then heated to 120°C and then extruded through a die at a delivery rate of 20 kg / h. The pressure of the die at this time is 25 MPa. The foamed asphalt thus obtained is a foamed product with smooth appearance, uniform average cell diameter, good surface appearance and high foaming rate. Index of prepared carbon foam material:

[0034] Surface appearance: smooth

[0035] Cell diameter: 120-130μm

[0036] Bulk density: 0.48~0.49g / cm 3

[0037] Coefficient of thermal expansion: 5.6PPM / ℃

[0038] Thermal conductivity: 115~119w / mk

[0039] Specific thermal conductivity: 235~233(w / mk) / (g / cm 3 )

Embodiment 3

[0041] It was carried out in a similar manner to Example 1, except that a cooling medium circulator was used, and the conveying pipeline from the carbon dioxide cylinder to the conveying pump was cooled with -30°C ethylene glycol / water solution. At this time, the temperature of the carbon dioxide was -10°C. The foamed asphalt thus obtained is equivalent to the product of Example 1.

[0042] Surface appearance: smooth

[0043] Cell diameter: 110-120μm

[0044] Bulk density: 0.50~0.51g / cm 3

[0045] Coefficient of thermal expansion: 5.6PPM / ℃

[0046] Thermal conductivity: 118~120w / mk

[0047] Specific thermal conductivity: 231~240(w / mk) / (g / cm 3 )

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Abstract

The invention discloses a new carbon foam material preparing method, including the steps as follows: (1) crushing massive material into 0.1-0.8 cu cm particles; (2) controlling pipeline temperature at -3-15 deg.C by cooling medium, using a feed pump to compress CO2 at 7.4MPa-40MPa by pressure control valve, heating up to above critical temperature 31 deg.C-100 deg.C, and then adding supercritical CO2 into melted pitch; (3) cooling the mixture of pitch and CO2 down to a temperature higher than pitch plastifying temperature by 50 deg.C and molding; (4) carbonating and graphiting the made pitch foamed body in the step 3, and finally making the carbon foam material. The beneficial effects of the invention are that: the made carbon foam material has uniform foaming holes, excellent-performance; and in preparing course, the operating environment is reliable and highly safe.

Description

Technical field [0001] The invention relates to a method for adding supercritical carbon dioxide to molten mesophase pitch to prepare foamed pitch, and then carbonizing and graphitizing to prepare a new pitch carbon foam material; in particular, it relates to a method for using carbon dioxide as a foaming agent A method for preparing a new pitch carbon foam material with uniform cell structure. Background technique [0002] Asphalt carbon foam material is a new material with high temperature resistance, light specific gravity and large specific surface area. It has excellent thermal conductivity and mechanical properties. It is used as a heat dissipation material in heat dissipation components such as automobiles, aerospace, navigation, and nuclear power. It can bring a great change to the miniaturization and lightness of the device. [0003] The main feature described in the patent by J.W.Klett et al. in USP 6033506, Process For Making Carbon Foam, is that the bituminous materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 郁铭芳王依民王燕萍倪建华徐爱华
Owner DONGHUA UNIV
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