Carbon fiber manufacturing method and carbon fiber

Patent metadata

Field	Value
Publication number	US-9796590-B2
Application number	US-201214235494-A
Country	US
Kind code	B2
Filing date	Aug 2, 2012
Priority date	Aug 2, 2011
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

Provided is a carbon fiber manufacturing method including a surface treatment step of ejecting an ozone solution in which ozone is dissolved in solvent from a fluid ejecting port toward a carbon fiber bundle and causing the ozone solution to pass between single fibers of the carbon fiber bundle so as to contact surfaces of the single fibers so that the surfaces of carbon fibers are treated by the ozone solution. Also, provided is a carbon fiber subjected to a surface treatment by the carbon fiber manufacturing method.

First claim

The invention claimed is:

1. A carbon fiber manufacturing method comprising:
a surface treatment step of ejecting an ozone solution in which ozone is dissolved in solvent from a fluid ejecting port toward a carbon fiber bundle and causing the ozone solution to pass between single fibers of the carbon fiber bundle so as to contact surfaces of the single fibers so that the surfaces of carbon fibers are treated by the ozone solution,

wherein:
the carbon fiber bundle comprises 10000 to 60000 single fibers, and
the ozone solution is ejected at an ejection speed set to 0.20 m/second to 2.0 m/second in a direction intersecting the transportation direction of the transported carbon fiber bundle from the fluid ejecting port.

2. The carbon fiber manufacturing method according to claim 1 ,
wherein a tension of the carbon fiber bundle measured when the ozone solution contacts surfaces of single fibers is 0.3 kgf to 1.8 kgf for twelve thousand single fibers.

3. The carbon fiber manufacturing method according to claim 1 or 2 ,
wherein the carbon fiber bundle is held inside the ozone solution for 0.1 seconds to 60 seconds.

4. The carbon fiber manufacturing method according to claim 1 or 2 ,
wherein, an ejection amount of the ozone solution per unit time is set to forty times to three hundred times with respect to a mass of the carbon fiber bundle passing above the fluid ejecting port or below the fluid ejecting port per unit time.

5. The carbon fiber manufacturing method according to claim 1 or 2 ,
wherein the number of times of ejecting the ozone solution from the fluid ejecting port toward the carbon fiber bundle so as to contact the surfaces of the single fibers is set to one to four times.

6. The carbon fiber manufacturing method according to claim 1 or 2 ,
wherein the fluid ejecting port has a rectangular shape, the length direction of the fluid ejecting port is the width direction of the carbon fiber bundle, and a length of the fluid ejecting port in the length direction is equal to or larger than a width of the carbon fiber bundle.

7. The carbon fiber manufacturing method according to claim 1 or 2 ,
wherein a collision plate is installed at a position facing the fluid ejecting port by interposing the carbon fiber bundle transported above a liquid level of an ozone treatment tank storing the ozone solution, and the ozone solution ejected from the fluid ejecting port is caused to pass between the single fibers of the carbon fiber bundle so as to collide with the collision plate.

8. The carbon fiber manufacturing method according to claim 7 ,
wherein the surface treatment is performed on the carbon fiber bundle of which the permeation resistance measured based on JIS P 8117:2009 is 100 seconds to 700 seconds and which is transported above the liquid level of the ozone treatment tank storing the ozone solution.

9. The carbon fiber manufacturing method according to claim 7 ,
wherein the surface treatment is performed on the carbon fiber bundle of which the moisture content is 40% or less and which is transported above the liquid level of the ozone treatment tank storing the ozone solution.

10. The carbon fiber manufacturing method according to claim 1 or 2 ,
wherein the surface treatment is performed on the carbon fiber bundle transported inside the ozone solution.

11. The carbon fiber manufacturing method according to claim 1 or 2 ,
wherein an ozone concentration of the ozone solution is 10 mg/L to 120 mg/L.

12. The carbon fiber manufacturing method according to claim 1 or 2 ,
wherein a carbon fiber is obtained of which a current value (ipa value) per unit area measured by a cyclic voltammetry method is 0.10 μA/cm 2 or more.

Assignees

• Kiriyama Takayuki
• Hata Masahiro
• Nakao Hiroyuki
• Yamamoto Nobuyuki
• Shimahara Masashi
• Watanabe Kenichi
• Murano Yasunori
• TATEGAKI Hiroshi
• Mitsubishi Chem Corp

Inventors

• Kiriyama Takayuki
• Hata Masahiro
• Nakao Hiroyuki
• Yamamoto Nobuyuki
• Shimahara Masashi
• Watanabe Kenichi
• Murano Yasunori
• TATEGAKI Hiroshi

Classifications

• D01F11/122

  Oxygen, oxygen-generating compounds (anode oxidising D01F11/16) · CPC title

• D06M2101/40

  Fibres of carbon · CPC title

• D06M11/34

  with oxygen, ozone or ozonides · CPC title

• C01B32/05 Primary

  Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30 · CPC title

• D06M23/06

  Processes in which the treating agent is dispersed in a gas, e.g. aerosols (aerosol compositions C09K3/30) · CPC title