B - Operations – Transporting – 05 – D
Patent
B - Operations, Transporting
05
D
B05D 7/14 (2006.01) B05C 3/02 (2006.01) B05D 1/12 (2006.01) B05D 7/00 (2006.01) F16L 58/04 (2006.01) B05D 1/00 (2006.01) B05D 3/02 (2006.01)
Patent
CA 2056635
Two methods are provided for applying and forming a protective composite coating on a metallic substrate. In the first method, the substrate is heated to a temperature between about 175° C and 275° C and a powdered coating of epoxy resin between 100 and 400 microns thick is applied to the outer surface of the heated substrate. A premixed powder coating of epoxy resin and polyolefin is applied directly onto the epoxy resin coating, forming an interlayer of interspersed domains of epoxy and polyolefin between about 100 and 400 microns in thickness. On to this, powdered polyolefin is sprayed to produce a polyolefin sheath coating for the metallic substrate between 200 and 1000 microns in thickness. In the second embodiment of the method, the interlayer is formed by spraying pure epoxy resin powder and polyolefin powder from separate sources simultaneously onto the substrate. By these methods, a metallic substrate coated with a composite epoxy/polyolefin protective coating is produced. A particular advantage of the methods results from the fact that the powders are applied in a common spray booth through which the substrate is advanced.
Holub Jiri
Mordarski Joseph G.
Wong Dennis
Ridout & Maybee Llp
Shaw Industries Ltd.
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