Non-stick coating composition
A non-stick coating composition comprising a waterborne phenoxy resin, a crosslinker, a silicone compound, and a Fluoropolymer. An article, such as aluminum, may be coated with the composition. The composition may be multi-layers, but only the layers other than the first layer includes the silicone compound. The invention includes the method for applying the coating or coatings.
1. A non-stick coating composition comprising:
at least 40 wt. % based on total solids of the composition a waterborne phenoxy resin, said phenoxy resin lacking terminal epoxy groups;
a crosslinker;
at least more than 5 wt. % based on total solids of the composition of a silicone compound; and
from 5 to 30 wt % based on total solids of the composition of a fluoropolymer.
2. The coating composition of claim 1 , wherein said crosslinker is melamine.
3. The coating composition of claim 1 , further comprising one or more epoxies.
4. The coating composition of claim 3 , wherein the one or more epoxies comprises a phosphoric acid modified epoxy functional aqueous emulsion.
5. The coating composition of claim 1 , wherein said coating composition is a single coat, and further comprises at least one of a polyamideimide and an epoxy.
6. The coating composition of claim 1 , comprising on the basis of total solids of the composition:
40-75 wt. % of the phenoxy resin,
5-20 wt. % of the crosslinker,
5-65 wt. % of the silicone compound, and
5-35 wt. % of the fluoropolymer;
and wherein the coating composition further comprises 0-10 wt. % of an epoxy, on the basis of total solids of the composition.
7. The coating composition of claim 1 , further comprising inorganic particles with Mohs hardness of at least 5, wherein the inorganic particles are present in an amount of 10-110 wt. % of total solid resin.
8. A coated article comprising a substrate coated with the coating composition of claim 1 .
9. The coated article of claim 8 , wherein said article further comprises a multi-coat non-stick system including a first coat and an exterior coat, wherein said first coat is not formed from a mixture containing the silicone compound, and at least one of the other coats is formed from a mixture containing the silicone compound.
10. The coated article of claim 9 , wherein said coats other than said exterior coat comprise the product of a mixture of the waterborne phenoxy resin, the crosslinker, and at least one of an epoxy resin and a polyamideimide resin.
11. The coated article of claim 9 , wherein one or more of said coats contain a filler selected from the group consisting of barium sulfate, calcium sulfate, calcium carbonate, silicas and silicates.
12. A method of coating a substrate comprising applying a coating composition according to claim 1 to said substrate, followed by drying and curing said coating composition.
13. The method of claim 12 , wherein said substrate comprises aluminum or a shaped aluminum article.
14. The method of claim 12 , wherein said substrate comprises grit blasted stainless steel or a shaped grit blasted stainless steel article.
15. The method of claim 12 , wherein said phenoxy resin is applied as a dispersion of said resin in water with a surfactant.
16. The method of claim 12 , wherein said phenoxy resin is applied as a polymer powder with an organic liquid.
17. The method of claim 12 , wherein said crosslinker is melamine.
18. A method of coating a substrate comprising applying a coating composition according to claim 1 to said substrate, wherein said applying includes the sequential steps of:
preparing the surface of the substrate for the coating composition;
applying the coating composition as a one coat or a multi-coat non-stick coating, wherein the first coat comprises the phenoxy resin, the crosslinker, and the silicone compound if the coating is applied as the one coat non-stick coating, and, if the coating is applied as the multi-coat non-stick coating, one or more of the coats other than the first coat comprises the silicone compound; and
baking the coated substrate to cure the coating composition.
19. The method of claim 18 , wherein said baking is carried out at temperatures ranging from about 200 to 350° C.
20. The method of claim 18 , wherein said crosslinker is melamine.
21. The coating composition of claim 1 , comprising between 40 wt. % and 75 wt. % phenoxy resin based on total solids of the composition.
22. The coating composition of claim 1 , comprising between 40 wt. % and 65 wt. % phenoxy resin based on total solids of the composition.
23. The coating composition of claim 1 , comprising between 5 wt. % and 20 wt. % crosslinker based on total solids of the composition.
24. The coating composition of claim 1 , comprising between 10 wt. % and 65 wt. % silicone compound based on total solids of the composition.
25. A non-stick coating composition comprising:
at least 40 wt. % based on total solids of the composition a waterborne phenoxy resin, said phenoxy resin lacking terminal epoxy groups;
at least 5 wt. % based on total solids of the composition of a crosslinker;
at least more than 5 wt. % based on total solids of the composition of a silicone compound; and
from 5 to 30 wt % based on total solids of the composition of a fluoropolymer.
26. The coating composition of claim 25 , comprising between 40 wt. % and 75 wt. % phenoxy resin based on total solids of the composition.
27. The coating composition of claim 25 , comprising between 40 wt. % and 65 wt. % phenoxy resin based on total solids of the composition.
28. The coating composition of claim 25 , comprising at least 10 wt. % crosslinker, based on total solids of the composition.
29. The coating composition of claim 25 , comprising between 10 wt. % and 65 wt. % silicone compound based on total solids of the composition.