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Method for producing hollow carbon fibers

A carbon fiber and hollow technology, applied in the fields of fiber chemical characteristics, textiles and papermaking, etc., can solve the problems of hollow carbon fiber containing impurities, difficult hollow fiber, low elastic modulus, etc., and achieve large lumen, thin tube wall and large output Effect

Inactive Publication Date: 2011-11-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problem of the high temperature and low elastic modulus of the existing spinning method for preparing hollow carbon fibers, and the fact that the hollow carbon fibers prepared by the chemical vapor growth method contain impurities, and it is difficult to synthesize hollow carbon fibers with a diameter of several hundred nanometers to several microns. Fiber problem, and provide a preparation method of hollow carbon fiber

Method used

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  • Method for producing hollow carbon fibers
  • Method for producing hollow carbon fibers
  • Method for producing hollow carbon fibers

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specific Embodiment approach 1

[0008] Specific Embodiment 1: The preparation method of a kind of hollow carbon fiber of this embodiment is carried out according to the following steps: 1. Put the carbon source material into the graphite crucible, and place the graphite crucible in the atmosphere sintering furnace, then pump the atmosphere sintering furnace Vacuum to make the pressure in the furnace reach 0.1Pa~1Pa; 2. Fill high-purity nitrogen or argon into the atmosphere sintering furnace to make the gas pressure in the atmosphere sintering furnace reach 0.2MPa~2.5MPa; 3. Use 5℃ / min~ At a speed of 30°C / min, the temperature in the atmosphere sintering furnace is raised to 900°C-1500°C, then kept for 1h-4h, and then cooled to room temperature with the furnace to obtain hollow carbon fibers; the carbon source in step 1 is urea or It is a mixture of polyvinyl alcohol and urea, wherein the mass ratio of polyvinyl alcohol: urea is 1:50-100.

[0009] This embodiment uses a simple process to synthesize hollow carb...

specific Embodiment approach 2

[0010] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in step 1, the pressure in the atmosphere sintering furnace is evacuated to 0.2 Pa to 0.9 Pa. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0011] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in Step 1, the pressure in the atmosphere sintering furnace is evacuated to 0.5 Pa. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a method for producing hollow carbon fibers, which relates to a method for producing carbon fibers. The invention solves the following problems of the prior spinning production process for producing hollow carbon fibers: high temperature, low elasticity modulus, impurities contained in hollow carbon fibers produced by the chemical vapor growing method and difficult synthesization of hollow carbon fibers with the caliber of hundreds of nanometers to a few microns. The method includes the following steps: (1) carbon source material is put into a graphite crucible, the graphite crucible is put into an atmosphere sintering furnace, and the atmosphere sintering furnace is vacuumized to 0.1Pa to 1Pa; (2) high-pure nitrogen or argon is filled into the furnace until pressure reaches 0.2MPa to 2.5MPa; (3) the temperature is increased to 900 DEG C to 1500 DEG C at 5 DEG C / min to 30 DEG C / min, and is then kept for one to four hours, and the furnace is then cooled to the room temperature, so that hollow carbon fibers are obtained. The reaction temperature of the method is low, catalyst is not used, the graphitization degree of the synthesized hollow carbon fibers is high, the hollow carbon fibers do not contain impurities, and the purity is 100 percent. The hollow carbon fibers are applicable to capacitors, hydrogen storage and composite materials.

Description

technical field [0001] The present invention relates to a method of producing carbon fibers. Background technique [0002] Similar to carbon nanotubes, hollow carbon fibers with a diameter between 100 nanometers and several microns have the advantages of high strength and strong conductivity. With the help of micron operation technology, hollow carbon fibers can be operated individually and can be used in microelectronic devices; When used as a reinforcement of composite materials, it can significantly reduce the density of composite materials and greatly increase the specific strength of composite materials. At present, there are two main methods for preparing hollow carbon fibers: spinning method and chemical vapor growth method. The diameter and wall of the hollow carbon fiber prepared by the spinning method are 30 μm to 100 μm. During the preparation, carbonization must be carried out at 1300°C to 1800°C, and graphitization must be carried out at a high temperature of 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/12D01F9/21D01F9/14
Inventor 温广武于洪明钟博张涛白宏伟
Owner HARBIN INST OF TECH
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