A kind of preparation method of pitch-based carbon fiber self-adhesive network material

A pitch-based carbon fiber, pitch fiber technology, which is applied in the preparation/purification of carbon, chemical instruments and methods, carbon compounds, etc., can solve the problems of increasing the propagation path, affecting high thermal conductivity and electrical conductivity, and achieves uniform fiber dispersion and improvement. The effect of specific thermal conductivity and simple operation

Active Publication Date: 2018-05-01
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as discussed above, the introduction of external carbonaceous bonding points still involves the uniform dispersion of carbonaceous precursors and carbon fibers, and for pitch-based carbon fibers, external carbonaceous bonding points will increase the propagation path and affect its high thermal and electrical conductivity.

Method used

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  • A kind of preparation method of pitch-based carbon fiber self-adhesive network material
  • A kind of preparation method of pitch-based carbon fiber self-adhesive network material
  • A kind of preparation method of pitch-based carbon fiber self-adhesive network material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Pre-oxidize 100% mesophase pitch fiber under an oxygen atmosphere until its oxidation weight gain is 4.04% (complete pre-oxidation weight gain is 5.20%), take 0.4g and chop it to a length of 1mm, mix it with deionized water and stir 2h to obtain a uniformly dispersed aqueous solution.

[0038] 2. Inject the aqueous solution obtained in step 1 into a mold with an inner diameter of 13 mm. The bottom of the mold is covered with filter cloth and a filter plate, and the filter plate has a pore size of 100 mesh. The bottom end is connected with a vacuum machine to speed up the water filtration process.

[0039] 3. After the mold is pressurized, place it in a drying oven and dry it at 100°C for 5 hours, and apply a pressure of 5KPa.

[0040] 4. After taking out the mold, put it into the carbonization furnace under nitrogen protection and raise the temperature to 550°C at 1°C / min.

[0041] 5. Cool naturally to room temperature and demould.

[0042] 6. Carbonize the self-a...

Embodiment 2

[0048] The difference between this example and example 1 is that after step 6, the self-adhesive carbon fiber network material obtained in step 6 is subjected to graphitization treatment under argon gas condition, and the heating rate during graphitization is 10°C / min graphitization temperature It is 2800°C.

[0049] The density of the pitch-based carbon fiber self-adhesive network material prepared in this example is 0.37 g cm -3 , the density of the pitch-based carbon fiber self-adhesive network reinforced epoxy resin composite material obtained by the composite material preparation method described in Example 1 is 1.35g cm -3 , the thermal conductivity measured by the carbon material thermal conductivity testing machine is 45.4w m in the direction perpendicular to the pressure -1 ·K -1 , 7.5w·m parallel to the direction of pressure -1 ·K -1 .

Embodiment 3

[0051] The difference between this embodiment and Example 2 is that the oxidation weight gain in step 1 is 3.97% (the complete pre-oxidation weight gain is 5.20%).

[0052] The density of the pitch-based carbon fiber self-adhesive network material prepared in this example is 0.42gcm -3 , the obtained pitch-based carbon fiber self-adhesive network reinforced epoxy resin composite material has a density of 1.40 g cm -3 , The compressive strength parallel to the pressing direction is 163MPa, which is 25% higher than the 130MPa of the pure epoxy resin sample. The thermal conductivity measured by the carbon material thermal conductivity testing machine is 49.5w m in the direction perpendicular to the pressure -1 ·K -1 , 7.8w·m parallel to the direction of pressure -1 ·K -1 .

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Abstract

The invention discloses a method for preparing a pitch-based carbon fiber self-bonding network material. The method includes the steps that pitch fibers are incompletely pre-oxidized and then subjected to short cutting, mechanical dispersion or gas-medium dispersion is carried out, the dispersed short-cut pre-oxidized pitch fibers are put into a die, and carbonization or graphitization is carried out, or through liquid-medium, dispersion carbonization or graphitization is carried out after die filling and drying, and then the pitch-based carbon fiber self-bonding network material is obtained. According to the method, external carbon bonding points do not need to be introduced, and the electricity conductivity, the heat conductivity and the mechanical performance of the material are obviously improved; even distribution of fibers is spatially achieved in the preparing stage of the carbon fibers, the film network material or the three-dimensional network material can be obtained; the method is simple in technology, safe, environmentally friendly and capable of achieving large-scale production.

Description

technical field [0001] The invention relates to a preparation method of a pitch-based carbon fiber self-adhesive network material, belonging to the technical field of carbon material preparation. Background technique [0002] Carbon fiber is a fibrous carbon material with excellent mechanical properties (such as high specific strength, high specific modulus, etc.) comprehensive performance. According to the shape of the dispersion, it can be divided into filament carbon fiber, chopped carbon fiber, woven carbon fiber and other forms. Among them, chopped carbon fiber has high machinability and relatively low cost, so it is widely used. However, due to the inert and hydrophobic surface of carbon fiber, there is a problem of uniform dispersion in the matrix. Therefore, when preparing chopped carbon fiber reinforced composites, domestic and foreign scholars often need to treat the surface of the fiber or add a dispersant to improve its dispersion in the matrix. Dispersion in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05C01B32/205
CPCC01P2004/03
Inventor 欧阳婷蒋朝费又庆李伟
Owner HUNAN UNIV
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