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Preparation method of carbon fiber with pyrolytic graphite deposited on surface

A technology of pyrolytic graphite and surface deposition, which is applied in carbon fiber, fiber treatment, textiles and papermaking, etc., can solve the problems of long production cycle, low utilization rate and low production efficiency, and achieve the goal of increasing surface roughness and improving surface activity Effect

Pending Publication Date: 2022-01-04
湖南东映碳材料科技有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation of pyrolytic carbon is usually carried out in a CVI / CVD furnace. This preparation process is a batch production process, and the temperature must be raised and lowered in each production process. The production efficiency is low and the energy utilization rate is low.
Therefore, its production cycle is long, the efficiency is low, and the cost is high; and the utilization rate of ethylene, methane, etc. used to provide carbon sources is low

Method used

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  • Preparation method of carbon fiber with pyrolytic graphite deposited on surface
  • Preparation method of carbon fiber with pyrolytic graphite deposited on surface
  • Preparation method of carbon fiber with pyrolytic graphite deposited on surface

Examples

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Effect test

Embodiment 1

[0038] The raw material is continuous carbon fiber treated with low temperature carbonization at 650°C; the above carbon fiber is subjected to continuous 2950°C graphitization treatment by using an automatic uncoiling device and driving drafting. Methane, hexane, propane and other tar-like aromatic compounds lose 20% of their weight; by adjusting the speed of the drive device, the residence time of carbon fibers in the ultra-high temperature graphitization furnace is adjusted to 3 minutes; the carbon fibers are decomposed during ultra-high temperature graphitization Methane, hexane, propane and other tar-like aromatic compounds and the sublimated carbon of the graphite heating element itself are used as carbon sources for simultaneous deposition of pyrolytic graphite on the surface of the fiber. The pyrolytic graphite presents obvious rough granular structure characteristics, and the particle length is 5 -10μm; After surface treatment, washing, drying, sizing, drying, winding a...

Embodiment 2

[0043] This embodiment is a specific implementation of the present invention, specifically the following steps:

[0044] The raw material is continuous carbon fiber treated with low temperature carbonization at 800°C; the above-mentioned carbon fiber is subjected to continuous 2900°C graphitization treatment by using an automatic uncoiling device and driving drafting. The thermal decomposition weight loss of the above-mentioned carbon fiber during the ultra-high temperature graphitization process is 15 %, wherein the decomposed components are methane, hexane, propane and other tar-like aromatic compounds; by adjusting the speed of the driving device, the residence time of carbon fiber in the ultra-high temperature graphitization furnace is adjusted to 1min; The decomposed methane, hexane, propane and other tar-like aromatic compounds and the sublimated carbon of the graphite heating element are used as carbon sources to deposit pyrolytic graphite on the surface of the fiber syn...

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Abstract

The invention provides a preparation method of a carbon fiber with pyrolytic graphite deposited on the surface. The preparation method comprises the following steps of drawing continuous carbon fibers to uncoil, then graphitizing the continuous carbon fibers, and then carrying out surface treatment, water washing, drying, sizing, drying and winding to obtain the carbon fibers with the pyrolytic graphite deposited on the surface, wherein the carbonization temperature of the continuous carbon fibers is greater than 600 DEG C and less than 1000 DEG C. According to the preparation method of the carbon fiber with the pyrolytic graphite deposited on the surface provided by the invention, the continuous carbon fibers which are only subjected to ultra-low-temperature carbonization treatment and high in volatile component content are adopted as raw materials, and through continuous graphitization treatment, tar and alkane substances decomposed from the continuous carbon fibers are cracked and deposited on the surfaces of the fibers at the high temperature, so that continuous graphitization of the carbon fibers is achieved, and the pyrolytic graphite is deposited on the surfaces of the fibers at the same time. Therefore, the surface roughness of the carbon fibers is increased, and the surface activity of the carbon fibers after graphitization is improved.

Description

technical field [0001] The invention belongs to the field of carbon fiber preparation, in particular to a method for preparing carbon fiber with pyrolytic graphite deposited on the surface. Background technique [0002] Carbon fiber has excellent properties such as high strength, high modulus, thermal conductivity, and electrical conductivity. It is widely used as a reinforcement material for carbon fiber resin-based composite materials, carbon-carbon composite materials, ceramic-based composite materials, and metal-based composite materials. Or as a wave-absorbing material, high thermal conductivity material, Friction-resistant materials, conductive materials and other functional materials. But carbon fiber also has many disadvantages. First of all, carbon fiber is not resistant to high temperature oxidation, and it is prone to oxidative ablation in an aerobic environment above 600 °C; secondly, the sheet graphite structure on the surface of carbon fiber, especially graphi...

Claims

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Application Information

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IPC IPC(8): D06M11/74D06M101/40
CPCD06M11/74D06M2101/40
Inventor 叶崇张宁园张岳峰黄东吴晃刘金水
Owner 湖南东映碳材料科技有限公司
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