Polyacrylonitrile-based precursor fiber for carbon fiber, and production method therefor

Abstract

A polyacrylonitrile-based precursor fiber for a carbon fiber and a method of producing the polyacrylonitrile-based precursor fiber, wherein the polyacrylonitrile-based precursor fiber includes a conductive carbon material are provided. The conductive carbon material may include at least one selected from the group consisting of carbon black, carbon nanotubes, graphene, and graphene oxide and may be used in an amount of 0.03 to 3.0 wt % based on the total amount of the polyacrylonitrile-based precursor fiber.

1 . A polyacrylonitrile-based precursor fiber for a carbon fiber, comprising a conductive carbon material. 
     
     
         2 . The polyacrylonitrile-based precursor fiber of  claim 1 , wherein the conductive carbon material comprises at least one selected from the group consisting of carbon black, carbon nanotubes (CNT), graphene, and graphene oxide. 
     
     
         3 . The polyacrylonitrile-based precursor fiber of  claim 1 , wherein the conductive carbon material is used in an amount of 0.03 to 3.0 wt % based on a total amount of the polyacrylonitrile-based precursor fiber. 
     
     
         4 . The polyacrylonitrile-based precursor fiber of  claim 1 , wherein the conductive carbon material has an electrical resistivity ranging from 3.5×10 −5  to 10 3  Ω-cm, a purity of 95% or more, and a particle diameter of 0.1 to 200 nm. 
     
     
         5 . The polyacrylonitrile-based precursor fiber of  claim 1 , which has a single-yarn fineness of 0.8 to 2.0 denier. 
     
     
         6 . A method of producing a polyacrylonitrile-based precursor fiber for a carbon fiber, comprising:
 preparing a polyacrylonitrile-based polymer solution;   spinning a spinning solution including a polyacrylonitrile-based polymer, thus obtaining a spun fiber;   extracting a solvent from the spun fiber in a coagulation solution, thus manufacturing a coagulated fiber;   washing the coagulated fiber with water;   drawing the coagulated fiber;   oiling the coagulated fiber; and   drying the coagulated fiber,   wherein in the preparing the polyacrylonitrile-based polymer solution, a conductive carbon material is added.   
     
     
         7 . The method of  claim 6 , wherein in the preparing the polyacrylonitrile-based polymer solution, a solution containing monomers for a polyacrylonitrile copolymer is added with the conductive carbon material and then polymerized. 
     
     
         8 . The method of  claim 7 , wherein the conductive carbon material is added in an amount of 0.03 to 3.0 wt % based on a total amount of the polyacrylonitrile-based precursor fiber. 
     
     
         9 . The method of  claim 6 , wherein the conductive carbon material comprises at least one selected from the group consisting of carbon black, CNT, graphene, and graphene oxide. 
     
     
         10 . The method of  claim 6 , wherein the conductive carbon material has an electrical resistivity ranging from 3.5×10 −5  to 10 3  Ω-cm, a purity of 95% or more, and a particle diameter of 0.1 to 200 nm. 
     
     
         11 . The method of  claim 6 , wherein the drawing is performed at a drawing ratio of 4 to 20.