Soil and dirt repellent powder coatings
View Patent ↗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 dirt repellant panel comprising:
a substrate; and
a powder coating applied to the substrate, the powder coating formed from a mixture comprising:
a binder comprising polymer resin that is substantially free of fluoro-carbon groups;
a cross-linker; and
a surfactant composition that is substantially solvent-free and comprises an anionic fluorosurfactant;
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 composition.
2. The dirt repellant panel of claim 1 wherein the anionic fluorosurfactant is present in an amount ranging from 0.7 wt. % to 3.0 wt. % based on the total weight of the powder coating.
3. The dirt repellant panel of claim 1 wherein the anionic fluorosurfactant comprises a phosphate group substituent.
4. The dirt repellant panel of claim 3 wherein the anionic fluorosurfactant has a pH ranging from 1 to 6.
5. The dirt repellant panel of claim 1 wherein the anionic fluorosurfactant has a melting point ranging from 50° C. to 70° C.
6. The dirt repellant panel of claim 1 wherein the polymer resin comprises hydroxyl-terminated polyester resin and the cross-linker comprises a blocked polyisocyanate.
7. The dirt repellant panel of claim 1 wherein the polymer resin comprises carboxylated polyester resin and a glycidyl-functional acrylic polymer resin and the cross-linker comprises a hydroxyl-functional compound.
8. The dirt repellant panel of claim 1 wherein the polymer resin comprises a polyester having a glass transition temperature of at least 67° C.
9. The dirt repellant panel of claim 1 wherein the mixture is free of volatile organic solvent and has solids content of 100%.
10. The dirt repellant panel of claim 1 wherein the powder coating has a thickness ranging from 45 μm to 120 μm.
11. A dirt repellant panel comprising:
a substrate; and
a powder coating applied to the substrate, the powder coating formed from a mixture comprising:
a polymer resin that is substantially free of fluoro-carbon groups and comprising polyester having a glass transition temperature ranging from greater than about 55° C. to 90° C.;
a cross-linker; and
a surfactant composition that is substantially solvent-free and comprises an anionic fluorosurfactant having a phosphate group substituent.
12. The dirt repellant panel of claim 11 wherein the anionic fluorosurfactant is present in an amount ranging from 0.05 wt. % to 4.0 wt. % based on the total weight of the powder coating.
13. The dirt repellant panel of claim 11 wherein the anionic fluorosurfactant has a melting point ranging from 50° C. to 70° C.
14. The dirt repellant panel of claim 11 wherein the polyester is hydroxyl-terminated polyester resin and the cross-linker comprises a blocked polyisocyanate.
15. The dirt repellant panel of claim 11 wherein the polyester is carboxylated polyester resin and the polymer resin further comprises a glycidyl-functional acrylic polymer resin, and the cross-linker comprises a hydroxyl-functional compound.
16. The dirt repellant panel of claim 11 wherein the mixture is free of volatile organic solvent and has solids content of 100%.
17. The dirt repellant panel of claim 11 wherein the powder coating has a thickness ranging from 45 μm to 120 μm.
18. The dirt repellant panel of claim 11 wherein the polyester has a glass transition temperature ranging from about 60° C. to 90° C.
19. A dirt repellant panel comprising:
a substrate; and
a powder coating applied to the substrate, the powder coating formed from a mixture comprising:
a binder comprising polymer resin having a glass transition temperature ranging between 65° C. and 90° C., the polymer resin that is substantially free of fluoro-carbon groups;
a cross-linker; and
an anionic fluorosurfactant comprising a phosphate group substituent and a C1 to C16 perfluoroalkylethyl group.
20. The dirt repellant panel of claim 19 wherein the anionic fluorosurfactant is present in an amount ranging from 0.05 wt. % to 4.0 wt. % based on the total weight of the powder coating.