Surface-treated carbon fiber, surface-treated carbon fiber strand, and manufacturing method therefor

Patent metadata

Field	Value
Publication number	US-2017335507-A1
Application number	US-201515533745-A
Country	US
Kind code	A1
Filing date	Dec 8, 2015
Priority date	Dec 9, 2014
Publication date	Nov 23, 2017
Grant date	—

Abstract

A surface-treated carbon fiber having a mole ratio between a carboxyl group and an acid anhydride of 50:50 to 70:30 when measured by pyrolysis gas analysis, is manufactured by spraying a reactive gas that has been made into a plasma onto the surface of a carbon fiber and introducing a functional group into the surface of the carbon fiber.

First claim

1 . A surface-treated carbon fiber, wherein a mole ratio between a carboxyl group and an acid anhydride measured by pyrolysis gas analysis is from 50:50 to 70:30.

2 . The surface-treated carbon fiber according to claim 1 , wherein a surface friction force measured by SPM analysis is from 1.25 to 1.75 times that of a non-surface-treated carbon fiber.

3 . The surface-treated carbon fiber according to claim 1 , wherein a surface oxygen concentration (O/C) measured by X-ray photoelectron spectroscopy is from 0.05 to 0.28.

4 . A surface-treated carbon fiber strand obtained by bundling the 1000 to 100000 surface-treated carbon fiber filaments according to claim 1 .

5 . A method for manufacturing the surface-treated carbon fiber according to claim 1 , comprising spraying a reactive gas which has been made into a plasma onto a surface of a carbon fiber continuously conveyed to introduce a functional group into the surface of the carbon fiber.

6 . The method for manufacturing a surface-treated carbon fiber according to claim 5 , wherein the reactive gas is a mixed gas of nitrogen and oxygen.

7 . The method for manufacturing a surface-treated carbon fiber according to claim 6 , wherein a mixing ratio of the reactive gas between nitrogen and oxygen is from 79:21 to 99.95:0.05.

8 . A method for manufacturing the surface-treated carbon fiber according to claim 1 , comprising:
a first plasma treatment for spraying a non-reactive gas which has been made into a plasma onto a surface of a carbon fiber continuously conveyed to clean the surface of the carbon fiber; and a second plasma treatment for spraying a reactive gas which has been made into a plasma onto the surface of the carbon fiber which has been subjected to the first plasma treatment and which is continuously conveyed to introduce a functional group into the surface of the carbon fiber.

9 . The method for manufacturing a surface-treated carbon fiber according to claim 8 , wherein the non-reactive gas is argon or helium.

10 . The method for manufacturing a surface-treated carbon fiber according to claim 8 , wherein the reactive gas is a mixed gas of nitrogen and oxygen.

11 . The method for manufacturing a surface-treated carbon fiber according to claim 10 , wherein a mixing ratio of the reactive gas between nitrogen and oxygen is from 79:21 to 99.95:0.05.

Assignees

• Univ Tokyo

Inventors

• Suzuki Takaya
• Zushi Hiroaki
• Saitou Noriaki

Classifications

• D06M10/06

  Inorganic compounds or elements · CPC title

• D06M11/58

  with nitrogen or compounds thereof, e.g. with nitrides (with ammonium halides D06M11/13) · CPC title

• D01F9/12

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

• C08J5/06

  using pretreated fibrous materials · CPC title

• D06M11/34

  with oxygen, ozone or ozonides · CPC title