Manufacturing method for carbon fiber

Patent metadata

Field	Value
Publication number	US-12480231-B2
Application number	US-202217871018-A
Country	US
Kind code	B2
Filing date	Jul 22, 2022
Priority date	Jul 23, 2021
Publication date	Nov 25, 2025
Grant date	Nov 25, 2025

Abstract

A manufacturing method for a carbon fiber includes: performing an emulsification step that includes uniformly mixing a silicone oil composition and an emulsifier to form an oiling agent, in which the silicone oil composition includes γ-divinyltriamine propylmethyldimethoxyl silane and N-(β-aminoethyl)-γ-aminopropylmethylbimethoxy silane; performing an oiling step that includes soaking a carbon raw filament in the oiling agent, such that the oiling agent is adhered to a surface of the carbon raw filament to form a carbon fiber precursor; and performing a calcination step on the carbon fiber precursor, such that the carbon fiber is formed.

First claim

What is claimed is:

1 . A manufacturing method for a carbon fiber, comprising: performing an emulsification step that comprises uniformly mixing a silicone oil composition and an emulsifier to form an oiling agent, wherein the silicone oil composition comprises γ-divinyltriamine propylmethyldimethoxyl silane and N-(β-aminoethyl)-γ-aminopropylmethylbimethoxy silane;
performing an oiling step that comprises soaking a carbon raw filament in the oiling agent, such that the oiling agent is adhered to a surface of the carbon raw filament to form a carbon fiber precursor;
performing a calcination step on the carbon fiber precursor, such that the carbon fiber is formed, and
carrying out a thermogravimetric analysis on the oiling agent in air, a weight of the oiling agent at a temperature of 273° C. to 277° C. is greater than 90% to 95% of an original weight of the oiling agent.

2 . The manufacturing method for the carbon fiber of claim 1 , wherein a weight ratio of the γ-divinyltriamine propylmethyldimethoxyl silane and the N-(β-aminoethyl)-γ-aminopropylmethylbimethoxy silane ranges from 7:3 to 8:2.

3 . The manufacturing method for the carbon fiber of claim 1 , wherein a weight of the oiling agent at a temperature of 428° C. to 432° C. is greater than 80% to 85% of the original weight of the oiling agent.

4 . The manufacturing method for the carbon fiber of claim 1 , wherein during the oiling step, an oil attachment ratio of the oiling agent ranges from 0.5% to 0.8%.

5 . The manufacturing method for the carbon fiber of claim 1 , further comprising:
performing a mixing step that comprises uniformly mixing the γ-divinyltriamine propylmethyldimethoxyl silane and the N-(β-aminoethyl)-γ-aminopropylmethylbimethoxy silane at a rotational speed of 300 rpm to 1000 rpm to form the silicone oil composition.

6 . The manufacturing method for the carbon fiber of claim 5 , wherein the mixing step is performed at a temperature of 50° C. to 65° C.

7 . The manufacturing method for the carbon fiber of claim 1 , wherein the emulsification step further comprises:
uniformly mixing the silicone oil composition, the emulsifier, and a deionized water to form the oiling agent, wherein a weight ratio of the silicone oil composition, the emulsifier, and the deionized water is (12 to 40):(3 to 15):(45 to 85).

8 . The manufacturing method for the carbon fiber of claim 1 , wherein the emulsifier comprises a nonionic surfactant, a cationic surfactant, an anionic surfactant, or combinations thereof.

9 . The manufacturing method for the carbon fiber of claim 8 , wherein the nonionic surfactant comprises a block copolymer of polyoxyethylene ether and polyoxypropylene ether, a block copolymer of tristyrylphenol ethoxylates and ethylene oxide, a block copolymer of tristyrylphenol ethoxylates and propylene oxide, or combinations thereof.

Assignees

• Formosa Plastics Corp

Inventors

• Hsieh Chia-Chun
• Tsai Kun-Yeh
• Chen Ching-Wen
• Hung Chia-Chi
• Chou Wen-Ju
• Hwang Long-Tyan

Classifications

• D10B2101/12

  Carbon; Pitch · CPC title

• D01F9/24

  from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• D06M2101/40

  Fibres of carbon · CPC title

• D06M15/643

  containing silicon in the main chain · CPC title

• D01F11/04

  of synthetic polymers · CPC title