Soil and dirt repellent powder coatings
A method of forming a dirt repellant panel coated with a powder coating composition that includes a polymeric binder and an anionic fluorosurfactant present in an amount ranging from about 0.1 wt. % to about 4 wt. %.
1. A method of forming a dirt repellant panel comprising:
a) applying a powder coating precursor to a substrate, the powder coating precursor comprising a mixture of polymeric resin, cross-linker, and anionic fluorosurfactant;
b) heating the powder coating precursor to a curing temperature such that the polymeric resin and cross-linker chemically react to form a cured powder coating atop the substrate; and
wherein the polymer resin is substantially free of fluoro-carbon groups.
2. The method according to claim 1 , wherein the curing temperature of step b) ranges from about 190° C. to about 210° C.
3. The method according to claim 1 , wherein the powder coating precursor has a solids content of 100%.
4. The method according to claim 1 , wherein the anionic fluorosurfactant is present in an amount ranging from 0.05 wt. % to 4 wt. % based on the total weight of the powder coating.
5. The method according to claim 1 , wherein the cured powder coating is substantially free of fluoropolymer.
6. The method according to claim 1 , wherein the anionic fluorosurfactant comprises a phosphate group substituent.
7. The method according to claim 1 , wherein the anionic fluorosurfactant has a melting point ranging from 50° C. to 70° C.
8. The method according to claim 1 , wherein the polymer resin has a glass transition temperature ranging from 45° C. to 90° C.
9. The method according to claim 1 , wherein the powder coating precursor further comprises a pigment in an amount ranging from 10 wt. % to 30 wt. % based on the total weight of the powder coating precursor.
10. A method of forming a dirt repellant panel comprising:
a) applying a powder coating precursor to a substrate, the powder coating precursor comprising a mixture of polymeric resin, cross-linker, a pigment, and anionic fluorosurfactant;
b) heating the powder coating precursor to a curing temperature such that the polymeric resin and cross-linker chemically react to form a cured powder coating atop the substrate; and
wherein the polymer resin is substantially free of fluoro-carbon groups.
11. The method according to claim 10 , wherein the anionic fluorosurfactant is present in an amount ranging from 0.05 wt. % to 4 wt. % based on the total weight of the powder coating.
12. The method according to claim 10 , wherein the anionic fluorosurfactant comprises a phosphate group substituent.
13. The method according to claim 10 , wherein the anionic fluorosurfactant comprises a C1 to C16 perfluoroalkyl group.
14. The method according to claim 10 , wherein the anionic fluorosurfactant has a pH ranging from 1 to 6.
15. The method according to claim 10 , wherein the cured powder coating has a thickness ranging from 40 μm to 120 μm.
16. The method according to claim 10 , wherein the polymer resin comprises at least one of polyester resin, polyurethane resin, epoxy resin, or polyester-urethane acrylate resin.
17. The method according to claim 10 , wherein the cross-linker comprises at least one of a hydroxyl group, a carboxylic acid group, an isocyanate group, or an epoxy group.
18. A method of forming a dirt repellant panel comprising:
a) applying a powder coating precursor to a substrate, the powder coating precursor comprising a mixture of polymeric resin, cross-linker, and anionic fluorosurfactant;
b) heating the powder coating precursor to a curing temperature such that the polymeric resin and cross-linker chemically react to form a cured powder coating atop the substrate; and
wherein the anionic fluorosurfactant comprises a phosphate group substituent.
19. The method according to claim 18 , wherein the polymer resin is substantially free of fluoro-carbon groups.
20. The method according to claim 18 , wherein the anionic fluorosurfactant is present in an amount ranging from 0.05 wt. % to 4 wt. % based on the total weight of the powder coating.