Burn-off protective coating
A protected substrate includes a planar substrate having a surface and a burn-off temporary protective layer positioned over at least a portion of the surface. The burn-off temporary protective layer includes a wax, a polyolefin, a polyester, a polycarbonate, a polyether, or some combination thereof. The burn-off temporary protective layer is removable by a heat treatment process that does not substantially damage the surface. Various other protected substrates and methods for protecting a substrate are also disclosed.
1. A protected substrate, comprising:
a planar substrate comprising a surface; and
a burn-off temporary protective layer positioned over at least a portion of the surface,
wherein the burn-off temporary protective layer comprises polylactic acid (PLA),
wherein the burn-off temporary protective layer is removable by a heat treatment process that does not substantially damage the surface.
2. The protected substrate of claim 1 , wherein the burn-off temporary protective layer further comprises polyethylene carbonate (PEC), polypropylene carbonate (PPC), polycaprolactone, polyoxymethylene, polyethylene, polypropylene, or some combination thereof.
3. The protected substrate of claim 1 , wherein the burn-off temporary protective layer comprises a thickness of at least 10 nm and at most 5,000 μm.
4. The protected substrate of claim 1 , wherein the planar substrate comprises glass.
5. The protected substrate of claim 1 , wherein the protected substrate does not include a temporary protective sheet positioned over the surface.
6. The protected substrate of claim 1 , wherein the burn-off temporary protective layer is an outermost layer of the planar substrate.
7. The protected substrate of claim 1 , wherein the burn-off temporary protective layer is positioned over the entire surface and at least a portion of an edge of the substrate.
8. The protected substrate of claim 1 , wherein the burn-off temporary protective layer is removable by burning at a temperature of at most 1000° C.
9. The protected substrate of claim 1 , wherein the heat treatment process does not cause the surface to have a color change (DECMC) of more than 3 units compared to a color of the surface before the heat treatment process.
10. The protected substrate of claim 1 , further comprising a functional coating positioned between the surface and the burn-off temporary protective layer.
11. The protected substrate of claim 10 , wherein the functional coating comprises a low-E coating layer.
12. The protected substrate of claim 1 , wherein the burn-off temporary protective layer comprises a material having a melting point of at least 60° C. and at most 350° C.
13. The protected substrate of claim 1 , wherein the burn-off temporary protective layer further comprises methyl acetate.
14. The protected substrate of claim 1 , wherein the burn-off temporary protective layer comprises a solvent.
15. A method for protecting a substrate, comprising:
providing a planar substrate comprising a surface; and
applying a material to form a burn-off temporary protective layer over at least a first portion of the surface,
wherein the burn-off temporary protective layer comprises polylactic acid (PLA),
wherein the burn-off temporary protective layer is removable by a heat treatment process that does not substantially damage the surface.
16. The method of claim 15 , wherein the burn-off temporary protective layer further comprises polyethylene carbonate (PEC), polypropylene carbonate (PPC), polycaprolactone, polyoxymethylene, polyethylene, polypropylene, or some combination thereof.
17. The method of claim 15 , wherein the planar substrate comprises glass.
18. The method of claim 15 , further comprising:
preparing the material by dissolving the polylactic acid (PLA) in methyl acetate, wherein the material is applied to form the burn-off temporary protective layer by curtain coating.
19. A method of removing a burn-off temporary protective layer from a coated substrate, comprising:
providing a coated planar substrate comprising a surface over a portion of which a burn-off temporary protective layer is applied, wherein the burn-off temporary protective layer comprises polylactic acid (PLA); and
removing the burn-off temporary protective layer from the surface by burning the burn-off temporary protective layer to form an unprotected substrate without substantially damaging the surface.
20. The method of claim 19 , wherein the burn-off temporary protective layer further comprises polyethylene carbonate (PEC), polypropylene carbonate (PPC), polycaprolactone, polyoxymethylene, polyethylene, polypropylene, or some combination thereof.