Carbon-fiber-precursor fiber bundle, carbon fiber bundle, and uses thereof

Patent metadata

Field	Value
Publication number	US-11332852-B2
Application number	US-202016860191-A
Country	US
Kind code	B2
Filing date	Apr 28, 2020
Priority date	Oct 13, 2010
Publication date	May 17, 2022
Grant date	May 17, 2022

Abstract

A method of producing a carbon fiber bundle is provided, involving performing a flame-proof treatment to a carbon-fiber-precursor acryl fiber bundle having a single-fiber fineness of 1.5 dtex or more and 5.0 dtex or less, and having a roundness of 0.7 or more and 0.9 or less in a cross-section shape perpendicular to a fiber axis of the single fiber to obtain a flame-proofed fiber bundle; and performing a carbonization treatment to the flame-proofed fiber bundle.

First claim

The invention claimed is:

1. A method of producing a carbon fiber bundle, comprising:
performing a flame-proof treatment to a carbon-fiber-precursor acryl fiber bundle having a single-fiber fineness of 1.5 dtex or more and 5.0 dtex or less, and having a roundness of 0.7 or more and 0.9 or less in a cross-section shape perpendicular to a fiber axis of the single fiber to obtain a flame-proofed fiber bundle; and
performing a carbonization treatment to the flame-proofed fiber bundle.

2. The method of producing a carbon fiber bundle, according to claim 1 ,
wherein, as the carbon-fiber-precursor acryl fiber bundle, an acryl fiber bundle is used, and
in the acryl fiber bundle, a constant velocity temperature rising exothermic curve at 30° C. or above and 450° C. or below measured at a temperature rising rate of 10° C./minute in air flow at 100 ml/minute at 30° C. and 0.10 MPa using a heat flux type differential scanning calorimeter satisfies the following condition:
a heat quantity Ja obtained by integrating an exothermic velocity at 230° C. or above and 260° C. or below of the constant velocity temperature rising exothermic curve is 100 kJ/kg or more and 250 kJ/kg or less; and heat quantity Jb obtained by integrating an exothermic velocity at 260° C. or above and 290° C. or below is 550 kJ/kg or more and 1050 kJ/kg or less.

3. The method of producing a carbon fiber bundle, according to claim 1 , wherein, as the carbon-fiber-precursor acryl fiber bundle, an acryl fiber bundle is used, the acryl fiber bundle comprising a polyacrylonitrile-based copolymer having a water contact angle of 40° or more and 70° or less.

4. The method of producing a carbon fiber bundle, according to claim 1 , wherein, as the carbon-fiber-precursor acryl fiber bundle, an acryl fiber bundle is used, the acryl fiber bundle comprising a polyacrylonitrile-based copolymer having a melting point under heat and humidity of 160 to 175° C.

5. The method of producing a carbon fiber bundle, according to claim 1 , wherein, as the carbon-fiber-precursor acryl fiber bundle, an acryl fiber bundle is used, the acryl fiber bundle having a single-fiber fineness of 1.5 dtex or more and 3.0 dtex or less.

6. The method of producing a carbon fiber bundle, according to claim 1 , wherein, the flame-proof treatment is performed under an oxidation atmosphere at temperature of 220° C. or above and 300° C. or below for 30 minutes or more and 90 minutes or less.

7. The method of producing a carbon fiber bundle, according to claim 1 , wherein the flame-proof treatment is performed to obtain a flame-proofed fiber bundle having a fiber density of 1.35 g/cm 3 or more and 1.43 g/cm 3 or less.

8. The method of producing a carbon fiber bundle, according to claim 1 , wherein the carbonization treatment is performed at temperature of 800° C. or above and 2000° C. or below in an inert gas.

Assignees

• Mitsubishi Chem Corp

Inventors

• Shinmen Yuusuke
• Hirota Norifumi
• Nii Takeshi

Classifications

• C08J5/248

  using pre-treated fibres · CPC title

• D01F9/12 Primary

  Carbon filaments; Apparatus specially adapted for the manufacture thereof · CPC title

• D01F9/225

  from stabilised polyacrylonitriles · CPC title

• Y10T428/298

  Physical dimension · CPC title

• D01D5/096

  Humidity control, or oiling, of filaments, threads or the like, leaving the spinnerettes · CPC title