Carbon fiber manufacturing method

Abstract

A carbon fiber manufacturing method is provided. A carbon fiber precursor fiber bundle is performed with a high-temperature carbonization step to form a carbon fiber, and then the carbon fiber is performed with a plasma surface treatment so that the surface of the carbon fiber is formed with a plasma-modified configuration which is relatively rougher. Finally, the surface of the carbon fiber is coated with a resin oiling agent to obtain the carbon fiber having the resin oiling agent thereon. Particularly, through a plasma surface treatment step, the surface of the carbon fiber is roughened and provided with functional groups, which is beneficial to enhance the interface bonding of the resin oiling agent and the carbon fiber. The structure of the carbon fiber is more stable and reliable. The cost of the carbon fiber production equipment and the working time can be reduced effectively.

What is claimed is: 
     
         1 . A carbon fiber manufacturing method, comprising:
 providing a raw material step, providing a carbon fiber precursor fiber bundle;   performing a high-temperature carbonization step, the carbon fiber precursor fiber bundle being heated to form a carbon fiber having a predetermined carbon content;   performing a plasma surface treatment step, a plasma gas flow with a predetermined power being provided to act on the carbon fiber at a predetermined time so that a surface of the carbon fiber is formed with a plasma-modified configuration;   performing a sizing step, the plasma-modified configuration being coated with a resin oiling agent; and   performing a drying step, the resin oiling agent coated on the plasma-modified configuration being processed with drying so that the resin oiling agent is firmly adhered to the surface of the carbon fiber.   
     
     
         2 . The carbon fiber manufacturing method as claimed in  claim 1 , wherein in the high-temperature carbonization step, the carbon fiber precursor fiber bundle is guided into a chamber, the chamber is formed with at least one microwave field concentration area therein, and is provided with a gas supply module to supply an inert gas and a microwave generating module to supply a high-frequency microwave, under the protection of the inert gas atmosphere, an electric field of the high-frequency microwave produces a sensing current to heat up and produce a high temperature quickly with the carbon fiber precursor fiber bundle passing through the microwave field concentration area. 
     
     
         3 . The carbon fiber manufacturing method as claimed in  claim 2 , wherein the chamber is provided with at least one pair of microwave-sensitive materials. 
     
     
         4 . The carbon fiber manufacturing method as claimed in  claim 3 , wherein the microwave-sensitive materials are one of graphite, carbide, magnetic compound, nitride, and ionic compound or a combination thereof. 
     
     
         5 . The carbon fiber manufacturing method as claimed in  claim 2 , wherein the inert gas is nitrogen, argon, helium, or a combination thereof. 
     
     
         6 . The carbon fiber manufacturing method as claimed in  claim 2 , wherein the frequency of the high-frequency microwave is in the range of 300-30,000 MHz, and its microwave power density is in the range of 1-1000 kW/m3. 
     
     
         7 . The carbon fiber manufacturing method as claimed in  claim 2 , wherein the chamber is an elliptic chamber. 
     
     
         8 . The carbon fiber manufacturing method as claimed in  claim 2 , wherein the chamber is a flat panel chamber. 
     
     
         9 . The carbon fiber manufacturing method as claimed in  claim 1 , wherein in the plasma surface treatment step, the plasma gas flow with a power of 100-10000 watts acts on the carbon fiber for 10-1000 milliseconds. 
     
     
         10 . The carbon fiber manufacturing method as claimed in  claim 1 , wherein in the plasma surface treatment step, an atmospheric plasma gas flow with a power of 100-10000 watts acts on the carbon fiber for 10-1000 milliseconds. 
     
     
         11 . The carbon fiber manufacturing method as claimed in  claim 1 , wherein in the plasma surface treatment step, a low-pressure plasma gas flow with a power of 100-10000 watts acts on the carbon fiber for 10-1000 milliseconds. 
     
     
         12 . The carbon fiber manufacturing method as claimed in  claim 1 , wherein in the plasma surface treatment step, a microwave plasma gas flow with a power of 100-10000 watts acts on the carbon fiber for 10-1000 milliseconds. 
     
     
         13 . The carbon fiber manufacturing method as claimed in  claim 1 , wherein in the plasma surface treatment step, a glow plasma gas flow with a power of 100-10000 watts acts on the carbon fiber for 10-1000 milliseconds. 
     
     
         14 . The carbon fiber manufacturing method as claimed in  claim 1 , wherein the carbon fiber precursor fiber bundle has a surface not processed with a pre-oxidation treatment. 
     
     
         15 . The carbon fiber manufacturing method as claimed in  claim 1 , wherein the carbon fiber precursor fiber bundle has a surface processed with a pre-oxidation treatment in advance. 
     
     
         16 . The carbon fiber manufacturing method as claimed in  claim 1 , wherein the resin oiling agent is a thermosetting resin oiling agent. 
     
     
         17 . The carbon fiber manufacturing method as claimed in  claim 1 , wherein the resin oiling agent is a thermoplastic resin oiling agent. 
     
     
         18 . The carbon fiber manufacturing method as claimed in  claim 1 , wherein the carbon content of the carbon fiber is in the range of 80%-90%.