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US 11,898,276 B2Granted
Carbon fiber and method of forming the same
AssigneeFormosa Plastics Corporation
InventorsKun-Yeh Tsai, Chia-Chi Hung, Wen-Ju Chou, Ching-Wen Chen, Chia-Chun Hsieh, Shi-Jie Lin, Long-Tyan Hwang
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Abstract
Carbon fiber and method of forming the same are provided. The method modifies proportion of a finishing oil to control a relation between a surface tension and a particle size of the finishing oil, and thus penetration of the finishing oil into an interior of the carbon fiber is avoided. Therefore, the carbon fiber can have both low oil residues and a high strength.
Claims18
A method of forming a carbon fiber, comprising:
- dissolving a polyacrylonitrile copolymer in a solvent to obtain a dope;
- performing a spinning process to the dope, thereby obtaining a filament tow;
- oiling the filament tow to obtain a filament with oil by using a finishing oil, wherein a surface tension (σ) is in a range of 30 mN/m to 70 mN/m, and the surface tension and a particle size (R) of the finishing oil satisfy following equation:
- 20<σ+(R/2)0.5<60;
- performing a compacting drying process to the filament with oil, thereby obtaining a filament;
- and
- performing a firing process to the filament, thereby obtaining the carbon fiber.
4 more elements
A method of forming a carbon fiber, comprising:
- performing a spinning process to a dope to obtain an as-spun fiber, wherein the dope comprises a polyacrylonitrile copolymer;
- performing a first drawing operation to the as-spun fiber to obtain a filament tow;
- oiling the filament tow to obtain a filament with oil by using a finishing oil, wherein a surface tension (a) and a particle size (R) of the finishing oil satisfy following equation:
- 20<σ+(R/2)0.5<60, the surface tension is in a range of 30 mN/m to 70 mN/m, and the finishing oil has a particle size of 10 nm to 500 nm;
- performing a compacting drying process to the filament with oil, thereby obtaining a first filament;
- performing a second drawing operation to the first filament, thereby obtaining a second filament;
- and
- performing a firing process to the second filament, thereby obtaining the carbon fiber, wherein the firing process includes a stabilization treatment and a carbonization treatment.
5 more elements
Dependencies are inferred from the claim text.