High performance coatings for building panels
The present invention is directed to dirt and anti-microbial resistant compositions and articles that include a powder coating composition formed from a precursor including polymeric binder resin, cross-linker, and a blend of liquid carrier and anionic fluorosurfactant. The powder coating may be formed using a liquid-based anionic fluorosurfactant wherein the solids content of the anionic fluorosurfactant within the precursor is from about 13 wt. % to about 28 wt. %.
1. A dirt repellant powder coating composition formed from a precursor comprising polymeric binder resin, cross-linker, and a blend of liquid carrier and anionic fluorosurfactant,
wherein the powder coating is substantially free of PVDF polymer;
wherein the anionic fluorosurfactant has a pH between 1 to 6; and
wherein the solids content of the anionic fluorosurfactant within the precursor is from about 13 wt. % to about 28 wt. %.
2. The dirt repellant powder coating composition of claim 1 , wherein the anionic fluorosurfactant has a pH between 1 to 5.
3. The dirt repellant powder coating composition of claim 1 , wherein the anionic fluorosurfactant has a melting temperature that ranges from about 50° C. to about 70° C.
4. The dirt repellant powder coating composition of claim 1 , wherein the anionic moiety of the anionic fluorosurfactant is selected from a sulfate, sulfonate, phosphate, or carboxylate moiety.
5. The dirt repellant powder coating composition of claim 1 , wherein the composition further comprises pigment.
6. The dirt repellant powder coating composition of claim 5 , wherein the pigment is titanium dioxide.
7. The dirt repellant powder coating composition of claim 5 , wherein the pigment is pretreated with the anionic fluorosurfactant prior to mixing with the polymer binder resin and the cross-linker.
8. The dirt repellant powder coating composition of claim 1 , wherein the polymeric binder resin has a glass transition temperature (Tg) from about 45° C. to about 80° C.
9. The dirt repellant powder coating composition of claim 1 , wherein the cross-linker is selected from the group consisting of polyol compounds, polycarboxylic acid compounds, polyisocyanate compounds, and epoxy-functional compounds.
10. A dirt repellant article comprising a powder coating applied to a substrate, the powder coating formed from a precursor comprising polymeric resin, cross-linker, and a blend of liquid carrier and anionic fluorosurfactant,
wherein the powder coating is substantially free of PVDF polymer;
wherein the anionic fluorosurfactant has a pH between 1 to 5; and
wherein the solids content of the anionic fluorosurfactant within the precursor is from about 13 wt. % to about 28 wt. %.
11. The article according to claim 10 , wherein the liquid carrier is water.
12. The article of claim 10 , wherein the powder coating has a thickness ranging from about 50 μm to about 120 μm.
13. The article according to claim 10 , wherein the fluorosurfactant is present in amount ranging from about 0.05 wt. % to about 4.0 wt. % based on the total weight of the powder coating.
14. The article according to claim 10 , wherein the fluorosurfactant is present in amount ranging from about 0.7 wt. % to about 3.0 wt. % based on the total weight of the powder coating.
15. The article according to claim 10 , wherein powder coating further comprises a pigment, wherein the fluorosurfactant is present in an amount ranging from about 10 wt. % to about 25 wt. % based on the total weight of the pigment.
16. The article according to claim 10 , wherein the fluorosurfactant has a melting temperature ranging from about 50° C. to about 70° C.
17. A dirt repellant article comprising:
a substrate; and
a powder coating formed from a precursor comprising a blend of polymeric binder, cross-linker, anionic fluorosurfactant, and liquid carrier;
wherein the anionic fluorosurfactant is present in amount ranging from about 0.05 wt. % to about 4.0 wt. % based on the total weight of the powder coating; and
wherein the anionic fluorosurfactant has a pH between 1 to 5; and
wherein the solids content of the anionic fluorosurfactant within the precursor is from about 13 wt. % to about 28 wt. %.
18. The article according to claim 17 , wherein the fluorosurfactant is present in amount ranging from about 0.7 wt. % to about 3.0 wt. % based on the total weight of the powder coating.
19. The article according to claim 17 , wherein powder coating further comprises a pigment, and wherein fluorosurfactant is present in an amount ranging from about 10 wt. % to about 25 wt. % based on the total weight of the pigment.
20. The article of claim 17 , wherein the binder is substantially free of fluoro-carbon groups.