Absorptive pigments comprising graphenic carbon particles

Patent metadata

Field	Value
Publication number	US-9938416-B2
Application number	US-201715440571-A
Country	US
Kind code	B2
Filing date	Feb 23, 2017
Priority date	Sep 30, 2011
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

Thermally produced graphenic carbon particles for use as absorptive pigments are disclosed. The pigments may be used in coatings and bulk articles to provide favorable absorbance characteristics at various wavelengths including visible and infrared regions.

First claim

We claim:

1. An absorptive coating comprising:
a resin film; and
an absorptive pigment comprising thermally produced graphenic carbon particles in an amount up to 20 weight percent based on the total dry film weight of the coating, wherein the absorptive coating has a minimum absorbance of 80 percent throughout a wavelength range of 400 to 1,400 nm.

2. The absorptive coating of claim 1 , wherein the thermally produced graphenic carbon particles comprise from 0.01 to 5 weight percent.

3. The absorptive coating of claim 1 , wherein the minimum absorbance is greater than 85 percent.

4. The absorptive coating of claim 1 , wherein the thermally produced graphenic carbon particles are produced from a hydrocarbon precursor material capable of forming a two-carbon-fragment species or a hydrocarbon material comprising methane introduced into a thermal zone at a temperature of greater than 3,500° C.

5. The absorptive coating of claim 1 , wherein the thermally produced graphenic carbon particles have an average aspect ratio greater than 3:1, a B.E.T. specific surface area of greater than 70 m 2 /g, and a Raman spectroscopy 2D/G peak ratio of at least 0.9:1.

6. The absorptive coating of claim 1 , wherein the resin film comprises a thermoset or thermoplastic film forming resin.

7. The absorptive coating of claim 1 , wherein the absorptive coating is applied on a substrate.

8. The absorptive coating of claim 7 , further comprising at least one intermediate coating between the absorptive coating and the substrate.

9. The absorptive coating of claim 8 , wherein the at least one intermediate coating comprises a primer coating or a color coating.

10. The absorptive coating of claim 7 , further comprising a top coating applied on at least a portion of the absorptive coating.

11. The absorptive coating of claim 10 , wherein the top coating comprises a color coating or a clear coating.

12. An absorptive coating composition comprising:
a solvent;
a film-forming resin; and
thermally produced graphenic carbon particles in an amount up to 20 weight percent of the total solids weight of the film-forming resin and the thermally produced graphenic carbon particles, wherein the absorptive coating composition has a minimum absorbance of 80 percent throughout a wavelength range of 400 to 1,400 nm when cured.

13. The absorptive coating composition of claim 12 , wherein the thermally produced graphenic carbon particles comprise from 0.01 to 5 weight percent.

14. The absorptive coating composition of claim 12 , wherein the thermally produced graphenic carbon particles have an average aspect ratio greater than 3:1, a B.E.T. specific surface area of greater than 70 m 2 /g, and a Raman spectroscopy 2D/G peak ratio of at least 0.9:1.

15. The absorptive coating composition of claim 12 , wherein the film-forming resin comprises a thermoset or thermoplastic film forming resin.

16. An article comprising:
a matrix material; and
an absorptive pigment dispersed in the matrix material comprising thermally produced graphenic carbon particles in an amount up to 20 weight percent based on the total weight of the matrix material and the thermally produced graphenic carbon particles, wherein the article has a minimum absorbance of 80 percent throughout a wavelength range of 400 to 1,400 nm.

17. The article of claim 16 , wherein the thermally produced graphenic carbon particles comprise from 0.01 to 10 weight percent.

18. The article of claim 16 , wherein the matrix material comprises a polymer.

19. A method of making an absorptive coating composition comprising dispersing thermally produced graphenic carbon particles and a film-forming resin in a solvent, wherein the thermally produced graphenic carbon particles comprise up to 20 weight percent of the total solids weight of the film-forming resin and the thermally produced graphenic carbon particles, and the absorptive coating composition has a minimum absorbance of 80 percent throughout a wavelength range of 400 to 1,400 nm when cured.

20. The method of claim 19 , wherein the thermally produced graphenic carbon particles are produced by introducing a methane precursor material or a hydrocarbon precursor material capable of forming a two-carbon-fragment species into a thermal zone having a temperature of greater than 3,500° C.

Assignees

• Ppg Ind Ohio Inc

Inventors

• Vanier Noel R
• Decker Eldon L
• Istivan Stephen B
• Hung Cheng-Hung
• Bonnett Gina R

Classifications

• C09C1/46

  Graphite {(C09C1/0015 takes precedence)} · CPC title

• C01P2006/40

  Electric properties · CPC title

• C01B2204/04

  Specific amount of layers or specific thickness · CPC title

• C01P2006/12

  Surface area · 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