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Graphite fiber and preparation method thereof

A graphite fiber and fiber technology, applied in the field of graphite fiber and its preparation, can solve the problems of inability to ensure the cleanliness of graphite fiber surface, affect the performance of graphite fiber, and pollution of graphite fiber, and achieve reduced equipment investment, high modulus, and improved affinity sexual effect

Active Publication Date: 2013-03-20
JILIN SHENZHOU CARBON FIBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Large-scale production of electrolytic cells usually contains a lot of floating dust and impurities, which will be adsorbed on the surface of graphite fibers and pollute the graphite fibers. Even if the graphite fibers are washed with water, the surface of the graphite fibers cannot be cleaned, which affects the preparation of the graphite fibers into composite materials. performance
Therefore, researching a method that does not contaminate graphite fibers and can convert the lyophobicity of the graphite fiber surface to lyophilicity is a technical problem that those skilled in the art have been eager to solve, but have not yet been solved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The preparation method of graphite fiber is to make polyacrylonitrile precursor into pre-oxidized fiber through pre-oxidation process, make pre-oxidized fiber through low-temperature carbonization process to become low-temperature carbonized fiber, process low-temperature carbonized fiber through surface coating process to become coated fiber, and process coated fiber through The high-temperature carbonization process becomes high-temperature carbonized fibers, and the high-temperature carbonized fibers undergo a secondary coating process to become secondary coating fibers, and the secondary coating fibers undergo a graphitization process to become high-performance graphite fibers; the pre-oxidation process is, at 180 to 300 ℃, in the air with a stretch ratio of 0.7 to 3.5, pre-oxidized while stretching; the low-temperature carbonization process is at 300 to 800°C, in an inert gas with a stretch ratio of 0.5 to 2, while stretching Carrying out low-temperature carbonizati...

Embodiment 1

[0031]Step 1, the raw silk of the present invention undergoes a pre-oxidation process at 180-300°C with a draw ratio of 0.7-3.5 in the air to become a pre-oxidized fiber, and passes the pre-oxidized fiber at a temperature of 300-800°C in an inert gas at a draw ratio of 0.5 ~2 draw ratio, become low temperature carbonized fiber through low temperature carbonization process;

[0032] Step 2, the low-temperature carbonized fiber undergoes a surface coating process to become a coated fiber, and the surface coating process uses water mist;

[0033] Step 3, subjecting the coated fiber to high-temperature carbonization at 800-1800°C in an inert gas with a draw ratio of 0.8-1.5 to become a high-temperature carbonized fiber;

[0034] Step 4, the high-temperature carbonized fiber undergoes a secondary coating process to become a secondary coating fiber, and the secondary surface coating adopts a 1% sodium chloride aqueous solution;

[0035] In step 5, the secondary coated fiber is subj...

Embodiment 2

[0037] Step 1 is the same as Step 1 in Example 1;

[0038] Step 2, the low-temperature carbonized fiber undergoes a surface coating process to become a coated fiber, and the surface coating process adopts a 0.5% sulfuric acid aqueous solution;

[0039] Step 3 is the same as step 3 in Example 1;

[0040] Step 4, the high-temperature carbonized fiber undergoes a secondary coating process to become a secondary coating fiber, and the secondary surface coating adopts a 0.8% polyvinyl alcohol aqueous solution;

[0041] Step 5 is the same as Step 5 in Example 1.

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Abstract

The invention discloses a graphite fiber and a preparation method thereof. The preparation method is characterized by comprising the following steps: carrying out preoxidation on a polyacrylonitrile precursor so as to obtain a preoxidated fiber; carrying out low-temperature carbonization on the preoxidated fiber so as to obtain a low-temperature carbonized fiber; carrying out surface coating on the low-temperature carbonized fiber so as to obtain a coated fiber; carrying out high-temperature carbonization on the coated fiber so as to obtain a high-temperature carbonized fiber; carrying out secondary coating on the high-temperature carbonized fiber so as to obtain a secondary coated fiber; and carrying out graphitization on the secondary coated fiber so as to obtain a high-performance graphite fiber. The graphite fiber and the preparation method thereof disclosed by the invention has the advantages that a surface treatment by using an electrolytic bath is not performed, thereby improving the lyophilic property of the graphite fiber, reducing the equipment investments in the electrolytic bath and a rinsing bath, avoiding the surface pollution of the graphite fiber, improving the affinity of the graphite fiber to a resin matrix, and facilitating the preparation of high-performance, high-modulus and high-strength graphite fibers.

Description

technical field [0001] The invention relates to a graphite fiber and a preparation method thereof. The graphite fiber is a high-modulus, high-strength carbon fiber. technical background [0002] Carbon fiber has excellent mechanical properties and high chemical stability, and is considered to be a very good reinforcing material. High modulus carbon fiber (also known as graphite fiber) is an important variety of carbon fiber. Graphite fibers are widely used in national defense construction and national economy. For spacecraft materials, people's requirements for the performance of structural materials focus on high modulus, high strength, small thermal expansion coefficient, high temperature resistance, and low density. Therefore, high modulus and high-strength carbon (graphite) fibers have become One of the indispensable raw materials for military and civilian dual-use composite materials of spacecraft, aerospace vehicles, satellites, military aircraft and various high-gra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/22
Inventor 黄涛刘延军邹海威李俊锋
Owner JILIN SHENZHOU CARBON FIBER CO LTD
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