Method for preparing blocky carbon nano ¬ fibers composite

A technology of carbon nanofibers and composite materials, which is applied in the field of preparation of bulk carbon nanofiber composites, which can solve the problem of unfavorable electrical and thermal conduction of carbon nanofiber composites, the inability to achieve uniform dispersion of carbon nanofibers, and the weakening of electrical and thermal conduction by fiber length and other issues to achieve the effect of multi-functionality, similar chemical properties and high mechanical strength

Inactive Publication Date: 2008-10-22
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, carbon nanofiber composites mainly achieve electrical and thermal conductivity through the carbon nanofiber network dispersed in the matrix, and the reduction of fiber length and the destruction of the inherent connection will weaken the conduction of electricity and heat in the carbon nanofiber network. , increasing resistance and thermal resistance
In addition, although high shear is applied, when the fiber loading is high, the agglomeration of carbon nanofibers will still occur, and the uniform dispersion of carbon nanofibers in the matrix cannot be achieved, which is not conducive to the realization of excellent performance of composite materials. Low fiber loading is also not conducive to the electrical and thermal conductivity of carbon nanofiber composites
None of the existing methods for preparing carbon nanofiber composites can solve the above problems well.

Method used

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  • Method for preparing blocky carbon nano ¬ fibers composite
  • Method for preparing blocky carbon nano ¬ fibers composite
  • Method for preparing blocky carbon nano ¬ fibers composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Put the mold containing 20mg of copper-nickel catalyst into a quartz tube furnace, 2 (volume fraction is 20%) He gas flow, the mixed gas flow rate is 200ml / min, the temperature is raised to 600°C and kept for 3h, and then switched to H 2 / C 2 h 4 (H 2 The volume fraction is 20%) of the mixed gas, the mixed gas flow rate is 200ml / min, the catalytic growth reaction of the bulk carbon nanofiber is carried out, the growth time is 3h, and the bulk carbon nanofiber is obtained after cooling;

[0030] The purchased liquid phenolic resin (PF-23 type, Shanghai Qinan Adhesive Material Factory) was diluted with absolute ethanol until the quality of the phenolic resin accounted for 45% of the solution mass, stirred to make the solution evenly mixed, and the phenolic resin-ethanol Solution 150g.

[0031] Take one block carbon nanofiber with a size of Ф24*30 (mm) and a mass of 2.08 g, and soak it in the above solution for 12 hours.

[0032] After taking it out, remove the excess...

Embodiment 2

[0035] Put the mold containing 20mg of copper-nickel catalyst into a quartz tube furnace, 2 (volume fraction is 50%) He gas flow, the mixed gas flow rate is 200ml / min, the temperature is raised to 500°C and kept for 7h, and then switched to H2 / C 2 h 4 (H 2 The volume fraction is 20% of the mixed gas, the mixed gas flow rate is 200ml / min, the catalytic growth reaction of the bulk carbon nanofiber is carried out, the growth time is 18h, and the bulk carbon nanofiber is obtained after cooling;

[0036] Dilute the purchased liquid phenolic resin with absolute ethanol until the mass of the phenolic resin accounts for 60% of the solution mass, stir to mix the solution evenly, and take 200 g of the phenolic resin-ethanol solution.

[0037] Take one block carbon nanofiber with a size of Ф24*30 (mm) and a mass of 1.96 g, and soak it in the above solution for 24 hours.

[0038] After taking it out, remove the excess solution on the surface, and dry it in vacuum at 60°C for 24h. Pla...

Embodiment 3

[0041] Put the mold containing 20mg of copper-nickel catalyst into a quartz tube furnace, 2 (volume fraction is 50%) He gas flow, the mixed gas flow rate is 200ml / min, the temperature is raised to 600°C and kept for 7h, and then switched to H 2 / C 2 h 4 (H 2 The volume fraction is 60%) of the mixed gas, the mixed gas flow rate is 200ml / min, the catalytic growth reaction of the bulk carbon nanofiber is carried out, the growth time is 3h, and the bulk carbon nanofiber is obtained after cooling;

[0042] Dilute the purchased liquid phenolic resin with absolute ethanol until the mass of the phenolic resin accounts for 45% of the solution mass, stir to make the solution evenly mixed, and take 200 g of the phenolic resin-ethanol solution.

[0043] Take one block carbon nanofiber with a size of Ф24*30 (mm) and a mass of 1.83 g, and soak it in the above solution for 24 hours.

[0044] After taking it out, remove the excess solution on the surface, and dry it in vacuum at 50°C for ...

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Abstract

The invention discloses a preparation method of block carbon nanofiber composite material which is characterized by putting a catalyst into a mould and raising the temperature until 400 to 700 DEG C in the He air stream containing H2 for 0.5 to 8 hours and then the air stream is switched and is conducted with gas containing carbon to carry out catalytic growth reaction of the block carbon nanofiber to obtain the block carbon nanofiber. The obtained block carbon nanofiber is infused into the solution of phenolic resin-ethanol, then is taken out, and the redundant solution is removed for drying in vacuum at the temperature of 40 to 70 DEG C, then is carbonized in the N2 air stream at the temperature of 700 to 1100 DEG C and finally the block carbon nanofiber composite material is obtained. The material of the invention shows high conductivity and high thermal conductivity, high mechanical strength and low density.

Description

technical field [0001] The invention relates to a preparation method of a novel bulk carbon nanofiber composite material. technical background [0002] Carbon nanofiber is a new type of carbonaceous nanomaterial whose diameter is between that of carbon nanotubes and vapor-phase grown carbon fibers. Nanocomposite materials are developed along with the development of nanotechnology. Due to the excellent comprehensive performance and designability of nanocomposites, the design and application of carbon nanofiber composites has become one of the research hotspots in the field of materials in recent years. By compounding carbon nanofibers with a matrix such as resin, the mechanical properties of the matrix can be enhanced, and a composite material with excellent properties such as high electrical conductivity, high thermal conductivity, and low density can be obtained. However, because carbon nanofibers are easy to agglomerate, it is difficult to disperse uniformly in the matri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83
Inventor 乔文明王志王莎莎陈庆军詹亮张睿梁晓怿凌立成
Owner EAST CHINA UNIV OF SCI & TECH
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