Carbon nanofiber dispersion liquid, coating composition, and paste composition

Patent metadata

Field	Value
Publication number	US-9455061-B2
Application number	US-201113882309-A
Country	US
Kind code	B2
Filing date	Oct 28, 2011
Priority date	Nov 2, 2010
Publication date	Sep 27, 2016
Grant date	Sep 27, 2016

Abstract

A carbon nanofiber dispersion liquid having an excellent dispersibility and dispersion stability. Also, coating paste compositions including the carbon nanofibers produced by using the dispersion liquid are provided. The carbon nanofiber dispersion liquid includes: a solvent; a carbon nanofiber; an alkanolamine; and a chelating agent. Preferably, in the carbon nanofiber dispersion liquid, the alkanolamine is at least one selected from a group consisting of monoisopropanolamine, diisopropanolamine, and triisopropanolamine. Also, in the carbon nanofiber dispersion liquid, the chelating agent is at least one selected from a group consisting of an aminocarboxylic acid chelating agent, a phosphonic acid chelating agent, a gluconic acid chelating agent, and an organic acid.

First claim

The invention claimed is:

1. A carbon nanofiber dispersion liquid comprising:
a solvent;
carbon nanofibers synthesized by catalytic chemical vapor deposition methods using a catalyst;
an alkanolamine; and
a chelating agent;
wherein the alkanolamine is at least one selected from a group consisting of monoisopropanolamine, diisopropanolamine, and triisopropanolamine, and
the chelating agent coordinates to the catalyst of the carbon nanofibers.

2. The carbon nanofiber dispersion liquid according to claim 1 , wherein the chelating agent is at least one selected from a group consisting of aminocarboxylic acid chelating agent, phosphonic acid chelating agent, gluconic acid chelating agent, and organic acid.

3. The carbon nanofiber dispersion liquid according to claim 2 , wherein 0.1 to 40 parts by mass of the alkanolamine is included in 100 parts by mass of the carbon nanofiber dispersion liquid.

4. The carbon nanofiber dispersion liquid according to claim 3 , wherein 0.01 to 10 parts by mass of the chelating agent is included in 100 parts by mass of the carbon nanofiber dispersion liquid.

5. The carbon nanofiber dispersion liquid according to claim 4 , wherein
a diameter of the carbon nanofiber is 1 to 100 nm,
an aspect ratio of the carbon nanofiber is 5 or more, and
a distance of [002] lattice plane in a graphite layer of the carbon nanofiber is 0.35 nm or less, the distance being measured by X-ray diffraction.

6. The carbon nanofiber dispersion liquid according to claim 3 , wherein
a diameter of the carbon nanofiber is 1 to 100 nm,
an aspect ratio of the carbon nanofiber is 5 or more, and
a distance of [002] lattice plane in a graphite layer of the carbon nanofiber is 0.35 nm or less, the distance being measured by X-ray diffraction.

7. The carbon nanofiber dispersion liquid according to claim 2 , wherein 0.01 to 10 parts by mass of the chelating agent is included in 100 parts by mass of the carbon nanofiber dispersion liquid.

8. The carbon nanofiber dispersion liquid according to claim 7 , wherein
a diameter of the carbon nanofiber is 1 to 100 nm,
an aspect ratio of the carbon nanofiber is 5 or more, and
a distance of [002] lattice plane in a graphite layer of the carbon nanofiber is 0.35 nm or less, the distance being measured by X-ray diffraction.

9. The carbon nanofiber dispersion liquid according to claim 2 , wherein
a diameter of the carbon nanofiber is 1 to 100 nm,
an aspect ratio of the carbon nanofiber is 5 or more, and
a distance of [002] lattice plane in a graphite layer of the carbon nanofiber is 0.35 nm or less, the distance being measured by X-ray diffraction.

10. The carbon nanofiber dispersion liquid according to claim 1 , wherein 0.1 to 40 parts by mass of the alkanolamine is included in 100 parts by mass of the carbon nanofiber dispersion liquid.

11. The carbon nanofiber dispersion liquid according to claim 10 , wherein 0.01 to 10 parts by mass of the chelating agent is included in 100 parts by mass of the carbon nanofiber dispersion liquid.

12. The carbon nanofiber dispersion liquid according to claim 11 , wherein
a diameter of the carbon nanofiber is 1 to 100 nm,
an aspect ratio of the carbon nanofiber is 5 or more, and
a distance of [002] lattice plane in a graphite layer of the carbon nanofiber is 0.35 nm or less, the distance being measured by X-ray diffraction.

13. The carbon nanofiber dispersion liquid according to claim 10 , wherein
a diameter of the carbon nanofiber is 1 to 100 nm,
an aspect ratio of the carbon nanofiber is 5 or more, and
a distance of [002] lattice plane in a graphite layer of the carbon nanofiber is 0.35 nm or less, the distance being measured by X-ray diffraction.

14. The carbon nanofiber dispersion liquid according to claim 1 , wherein 0.01 to 10 parts by mass of the chelating agent is included in 100 parts by mass of the carbon nanofiber dispersion liquid.

15. The carbon nanofiber dispersion liquid according to claim 14 , wherein
a diameter of the carbon nanofiber is 1 to 100 nm,
an aspect ratio of the carbon nanofiber is 5 or more, and
a distance of [002] lattice plane in a graphite layer of the carbon nanofiber is 0.35 nm or less, the distance being measured by X-ray diffraction.

16. The carbon nanofiber dispersion liquid according to claim 1 , wherein
a diameter of the carbon nanofiber is 1 to 100 nm,
an aspect ratio of the carbon nanofiber is 5 or more, and
a distance of [002] lattice plane in a graphite layer of the carbon nanofiber is 0.35 nm or less, the distance being measured by X-ray diffraction.

17. A coating composition comprising the carbon nanofiber dispersion liquid according to claim 1 , and a binder component.

18. A conductive coating film formed by the coating composition according to claim 17 .

19. A paste composition comprising the carbon nanofiber dispersion liquid according to claim 1 , and a binder component.

20. A conductive coating film formed by
the paste composition according to claim 19 .

Assignees

• Hagiwara Masahiro
• Sakaya Osamu
• Mitsubishi Materials Corp

Inventors

• Hagiwara Masahiro
• Sakaya Osamu

Classifications

• H01B1/24 Primary

  the conductive material comprising carbon-silicon compounds, carbon or silicon · CPC title

• C08K3/04

  Carbon · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• C09D5/24

  Electrically-conducting paints {(conductive materials H01B1/00)} · CPC title

• C01P2004/54

  Particles characterised by their aspect ratio, i.e. the ratio of sizes in the longest to the shortest dimension · CPC title