High build polyurethane coating
AssigneeLockheed Martin Corporation
InventorsJames E. Foreman, Douglas R. Dowell, Bobby G. Isler
Life of this patent
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Abstract
An improved durable, low density, high build polyurethane coating is disclosed, as well as its method of manufacture. A slow reacting polyisocyanate is combined with a polyol so as to form a uniform mixture with an extremely long pot life. The low viscosity uniform mixture can then be sprayed onto a substrate using a conventional spray gun. A polyurethane catalyst is introduced after formation of the uniform mixture, preferably via a second spray nozzle so that catalyst is externally mixed into the polyisocyanate/polyol spray stream. This is a 100%, or near 100%, solids system so that there is very low volatile organic compound emissions.
Claims15
A durable, low density, high build polyurethane coating which is capable of having a thickness greater than 0.100 inches when applied during a single application, wherein the polyurethane coating is prepared by a process which comprises:
- (a) mixing at least one polyol and at least one polyisocyanate so as to provide a uniform mixture in which the polyol and polyisocyanate have not substantially reacted to form a urethane and which has sufficiently low viscosity such that the mixture is capable of being sprayed,
- (b) introducing a catalytically effective amount of at least one polyurethane catalyst into the uniform mixture, and
- (c) spraying the mixture onto a substrate so as to form a durable, low density, high build polyurethane coating thereon.
A durable, low density, high build polyurethane coating which is capable of having a thickness greater than 0.030 inches when applied during a single application to a vertical surface, wherein the polyurethane coating is prepared by a process which comprises:
- (a) mixing at least one polyol and at least one polyisocyanate so as to provide a uniform mixture in which the polyol and polyisocyanate have not substantially reacted to form a urethane and which has sufficiently low viscosity such that the mixture is capable of being sprayed,
- (b) introducing a catalytically effective amount of at least one polyurethane catalyst into the uniform mixture, and
- (c) spraying the mixture onto a substrate so as to form a durable, low density, high build polyurethane coating thereon.
A polyurethane coating which is capable of having a thickness greater than about 0.100 inches, wherein said polyurethane coating has a tensile strength ranging from about 50 to about 1000 psi, and a % elongation at failure ranging from about 50 to about 400%.
A polyurethane coating which is capable of having a thickness greater than about 0.030 inches when applied during a single application to a vertical surface, wherein said polyurethane coating has a tensile strength ranging from about 50 to about 1000 psi, and a % elongation at failure ranging from about 50 to about 400%.
Dependencies are inferred from the claim text.