US 12,070,770 B2
Composite coatings having improved UV and paint stripping resistivity and methods for making same
Mark R. Brei, Ladson, SC (US); Kevin D. Gordon, Summerville, SC (US); Anthony M. Westren, Mount Pleasant, SC (US); Meredith P. Nix, Charleston, SC (US); and Kjersta Larson-Smith, Seattle, WA (US)
Assigned to THE BOEING COMPANY, Arlington, VA (US)
Filed by The Boeing Company, Arlington, VA (US)
Filed on Jul. 18, 2019, as Appl. No. 16/515,121.
Prior Publication US 2021/0016319 A1, Jan. 21, 2021
Int. Cl. B05D 7/00 (2006.01); C09J 163/00 (2006.01)
CPC B05D 7/584 (2013.01) [C09J 163/00 (2013.01); B05D 2201/02 (2013.01); B05D 2420/00 (2013.01); B05D 2503/00 (2013.01); B05D 2504/00 (2013.01); C09J 2463/006 (2013.01)] 21 Claims
 
1. A co-curable polyurethane-coated epoxy-based composite material stack consisting of:
a co-curable epoxy-based composite substrate, said co-curable epoxy-based composite substrate comprising a co-curable epoxy-based composite substrate outer surface;
a co-curable epoxy-based adhesive surfacing material film layer disposed onto the co-curable epoxy-based composite substrate outer surface, said co-curable epoxy-based adhesive surfacing material film layer selected to begin curing at a curing temperature of about 150° F. and at a curing temperature lower than a co-curing temperature of the co-curable epoxy-based composite substrate outer surface;
a single co-curable polyurethane-based coating material film layer disposed onto the co-curable epoxy-based adhesive surfacing material film layer to form the co-curable polyurethane-coated epoxy-based composite material stack, said single co-curable polyurethane-based coating material film layer in direct contact with the co-curable epoxy-based adhesive surfacing material film layer, said single co-curable polyurethane-based coating material film layer configured to alone impart UV protection to the co-curable polyurethane-coated epoxy-based composite material stack;
wherein upon curing said co-curable epoxy-based composite substrate, said co-curable epoxy-based adhesive surfacing material film layer, and said single co-curable polyurethane-based coating material film layer are configured to co-cure at a co-curing temperature ranging from about 250° F. to about 400° F. to form a co-cured polyurethane-coated epoxy-based composite material stack;
wherein upon co-curing the co-curable epoxy-based composite material substrate outer surface and the co-curable epoxy-based adhesive surfacing material film layer are configured to form a co-cured miscible layer, said co-cured miscible layer comprising an amount of epoxy-based material from the co-curable epoxy-based composite substrate, said co-cured miscible layer further comprising an amount of epoxy-based material from the co-curable epoxy-based adhesive surfacing material film layer;
wherein after co-curing, the single co-curable polyurethane-based coating material film layer provides to the co-cured polyurethane-coated epoxy-based composite material stack an ultraviolet and visible transmittance value of 0% for wavelengths ranging from about 200 nm to about 800 nm when the single co-curable polyurethane-based coating material film layer comprises an average layer thickness ranging from about 2 mils to about 3 mils; and
wherein said single co-curable polyurethane-based coating material film layer comprises a Tg ranging from about 0° F. to about 200° F.