Solar reflective coating composition

Patent metadata

Field	Value
Publication number	US-10619053-B2
Application number	US-201715796101-A
Country	US
Kind code	B2
Filing date	Oct 27, 2017
Priority date	Oct 27, 2017
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

A solar reflective coating composition includes: a film-forming resin; a plurality of near-IR transparent pigments dispersed in the film-forming resin, the plurality of near-IR transparent pigments including a first perylene pigment and a second perylene pigment different from the first perylene pigment; and a near-IR reflective pigment dispersed in the film-forming resin, the near-IR reflective pigment different from the first perylene pigment and the second perylene pigment. When formed into a cured coating over a substrate, the cured coating exhibits an off-white or grey color. The solar reflective coating composition is substantially free of carbon black. The present invention is also directed to a substrate having a surface at least partially coated with a solar reflective coating composition and a method of preparing a low weight aerospace component.

First claim

The invention claimed is:

1. A solar reflective coating composition comprising:
a film-forming resin;
a plurality of near-IR transparent pigments dispersed in the film-forming resin, the plurality of near-IR transparent pigments comprising a first perylene pigment and a second perylene pigment different from the first perylene pigment; and
a near-IR reflective pigment dispersed in the film-forming resin, the near-IR reflective pigment different from the first perylene pigment and the second perylene pigment,
wherein, when formed into a cured coating over a substrate, the cured coating exhibits an off-white or grey color, and
wherein the solar reflective coating composition is substantially free of carbon black,
wherein the cured coating exhibits the off-white or grey color as defined by the following CIELAB values as measured using an integrating sphere with D65 Illumination, 10° observer with specular component included:
a L* value ranging from 40 to 95;
an a* value ranging from −2 to 2; and
a b* value ranging from −6 to 6.

2. The coating composition of claim 1 , wherein the first perylene pigment comprises a green-shade perylene pigment and the second perylene pigment comprises a purple-shade perylene pigment.

3. The coating composition of claim 1 , wherein the near-IR reflective pigment comprises titanium dioxide.

4. The coating composition of claim 3 , wherein the titanium dioxide is dispersed in the film-forming resin in powder form.

5. The coating composition of claim 1 , wherein the cured coating exhibits a total solar reflectance of at least 45% as measured in accordance with ASTM E903-12.

6. The coating composition of claim 1 , wherein the cured coating fully hides the substrate at a dry film thickness of less than or equal to 2.5 mils, according to ASTM D6762.

7. A substrate comprising a surface at least partially coated with the solar reflective coating composition of claim 1 .

8. The substrate of claim 7 , wherein the substrate is an aerospace component.

9. The substrate of claim 8 , wherein the aerospace component comprises a carbon fiber reinforced polymer composite.

10. The substrate of claim 7 , wherein the solar reflective coating composition, when cured, is the sole coating layer on the substrate.

11. The substrate of claim 7 , wherein the solar reflective coating composition, when cured, has a dry film thickness of less than or equal to 2.5 mils.

12. The substrate of claim 7 , further comprising a basecoat layer underlying at least a portion of the solar reflective coating composition.

13. The substrate of claim 7 , wherein the near-IR reflective pigment comprises titanium dioxide.

14. The substrate of claim 13 , wherein the titanium dioxide is dispersed in the film-forming resin in powder form.

15. The substrate of claim 7 , wherein the first perylene pigment comprises a green-shade perylene pigment and the second perylene pigment comprises a purple-shade perylene pigment.

16. The substrate of claim 7 , wherein the solar reflective coating composition, when cured, exhibits a total solar reflectance of at least 45% as measured in accordance with ASTM E903-12.

17. A method of preparing a low weight aerospace component comprising:
coating at least a portion of surface of an aerospace component with the coating composition of claim 1 ; and
curing the solar reflective coating composition to form a solar reflective layer.

18. The method of claim 17 , wherein the solar reflective layer has a dry film thickness of less than or equal to 2.5 mils.

19. A vehicle comprising a surface at least partially coated with the solar reflective coating composition of claim 1 .

20. The vehicle of claim 19 , wherein the vehicle is an aircraft.

21. The coating composition of claim 1 , wherein the cured coating exhibits a L* value ranging from 55 to 95.

Assignees

• Prc Desoto Int Inc

Inventors

• Mcquown Stephen G
• Slomski John
• Hellring Stuart D
• Holsing Luann
• Gill Tejveen

Classifications

• C09D7/41

  Organic pigments; Organic dyes · CPC title

• C08G18/4202

  Two or more polyesters of different physical or chemical nature (C08G18/44 takes precedence) · CPC title

• C08K5/3437

  condensed with carbocyclic rings · CPC title

• C08K2201/019

  the composition being defined by the absence of a certain additive · CPC title

• C09D167/00

  Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain (based on polyester-amides C09D177/12; based on polyester-imides C09D179/08); Coating compositions based on derivatives of such polymers · CPC title