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Microscopic carbon fiber with a variety of structures

A carbon fiber and fine technology, applied in the field of fine carbon fibers, can solve the problems of easy deformation of fibers, difficult to disperse, and difficult to decompose agglomerated particles, so as to reduce defects, improve dispersion, and improve bending rigidity.

Inactive Publication Date: 2006-08-16
MITSUI & CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the laminated structure of concentric circular graphene sheets, the fibers are easily deformed, and the fibers are aggregated due to van der Waals force, and the aggregate of the fibers tends to become a structure in which the fibers are entangled with each other.
Therefore, there is a problem that when particles having such an aggregated structure are mixed and dispersed in a matrix material as a filler material for a composite material, the aggregated particles entangled with each other are not easily decomposed and are difficult to disperse.

Method used

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  • Microscopic carbon fiber with a variety of structures
  • Microscopic carbon fiber with a variety of structures
  • Microscopic carbon fiber with a variety of structures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] Using the CVD method, using toluene as a raw material to synthesize fine carbon fibers.

[0111] synthesis device such as Figure 8 shown.

[0112] As a catalyst, a mixture of ferrocene and thiophene was used, and the synthesis was carried out in a hydrogen reducing atmosphere. Toluene, the catalyst, and hydrogen were heated to 375° C., supplied to a production furnace, and allowed to react at a temperature of 1200° C. for 8 seconds. Atmospheric gas is separated by a separator and recycled. The hydrocarbon concentration in the feed gas was 9% by volume.

[0113] The tar content of the fine carbon fibers of the synthesized intermediate material (first intermediate material) was 10%.

[0114] Next, the fiber was heated up to 1200°C and held for 30 minutes to perform hydrocarbon separation treatment, and further, high-temperature heat treatment was performed at 2500°C. Hydrocarbon separation and high temperature heat treatment process equipment such as Figure 9 show...

Embodiment 2

[0119] The synthesis apparatus shown in Fig. 10 was used.

[0120] Using benzene as the carbon raw material, after dissolving the catalyst ferrocene and thiophene, it is gasified at 380°C and then introduced into the production furnace. The temperature of the forming furnace was 1150° C., and the atmosphere gas in the furnace was a hydrogen atmosphere. The residence time of hydrogen gas and raw material gas in the furnace was 7 seconds. The tar content of the carbon fibers (first intermediate) recovered downstream of the furnace was 14%.

[0121] Next, after heat-treating the fiber (first intermediate) at 1200° C. for 35 minutes, the specific surface area of ​​the carbon fiber (second intermediate) was measured and found to be 33 m 2 / g. I determined by Raman spectroscopy D / I G is 1.0.

[0122] Furthermore, with respect to the magnetic flux density, the magnetoresistance value of the fine carbon fiber after high-temperature heat treatment at 2500°C is negative, and has ...

Embodiment 3

[0124] The fine carbon fibers obtained in Example 1 were measured using an X-ray diffraction apparatus. For comparison, graphite was also measured using an X-ray diffraction device. The X-ray diffraction spectrum obtained according to the measurement results is as follows Image 6 As shown, since the peak intensity of the fine carbon fibers obtained in Example 1 was weak, the comparison was magnified 10 times.

[0125] From this result, both have peaks at around 77° that are equivalent to the reflection of the graphite (110) plane. The graphite sample had a peak at around 83° corresponding to the reflection of the graphite (112) plane, but this was not found in the fine carbon fibers of Example 1. Therefore, the fine carbon fibers of the present invention do not have the three-dimensional regular structure of graphite.

[0126] Also, from this result, the interplanar spacing of the obtained fine carbon fibers was 3.388 angstroms.

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Abstract

A microscopic carbon fiber formed of a fiber-like substance of such a structure that cylindrical graphen sheets are stacked on each other in a right-angled direction to the axis thereof, wherein the sheets forming a cylinder comprise a polygonal cross section perpendicular to the axis thereof, the maximum diameter of the cross section is 15 to 100 nm, an aspect ratio is 10<5>or less, and I / I measured by Raman spectroscopic analysis is 0.1 or less. By adding a small amount of carbon fiber, physical properties such as electric characteristics, mechanical properties, and thermal properties can be increased without impairing the characteristics of a matrix.

Description

technical field [0001] The present invention relates to fine carbon fibers having various structures, including cylindrical laminates of fine carbon flakes, and more specifically, to fine carbon fibers that are suitable for addition to resins and the like as fillers. Background technique [0002] Carbon fiber is widely known as fibrous carbon, and in recent years, fine carbon fibers have attracted attention. According to the fiber diameter, there are several types of fine carbon fibers, such as gas phase carbon fibers, carbon nanofibers, and carbon nanotubes. Among them, carbon nanotubes are the smallest, with a fiber diameter of 100nm or less. According to their specific physical properties, they are expected to be widely used in nanoelectronic materials, composite materials, catalyst supports for fuel cells, and gas absorption. [0003] Among the carbon nanotubes, there are known single-walled carbon nanotubes (SWNTs) in which carbon atoms are bonded in a network (graphen...

Claims

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Application Information

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IPC IPC(8): D01F9/127C01B31/02
Inventor 远藤守信塚田高行宗兼史典大里一弘
Owner MITSUI & CO LTD
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