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US 2003/0148037 A1Published application
Process for preparing corrosion-resistant metal articles for marine applications
OwnerScott J. McKeandinventor
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Abstract
Spray on polyurethaneurea coatings provide corrosion resistance over long periods of time to marine fixtures, particularly of active metals such as aluminum and steel. Radar arches, fishing platforms, railing systems, etc. can maintain their aesthetics over extended periods of time, even in salt water environments, when the coating has been penetrated to the metal surface.
Claims20
A process of imparting corrosion resistance to a substrate for use in a marine environment by coating said substrate with a polyurethaneurea, said process comprising:
- mixing
- a) an A-side of a polyurethaneurea coating comprising an isocyanate-terminated prepolymer prepared by reacting an excess of a diisocyanate with at least one hydrophobic polyoxyalkylene diol having a molecular weight of from 400 Da to 4000 Da;
- with
- b) a B-side containing a diamine and a hydrophobic polyoxyalkylene diol having a molecular weight determined by its hydroxyl number of from 200 Da to 4000 Da, in a weight ratio of diamine to hydrophobic polyoxyalkylene diol of from 1:10 to 10:1;
- to form a curable polyurethaneurea mixture having an NCO/OH ratio of from 0.85 to 1.15;
- c) spraying said curable mixture onto said substrate, and curing said mixture to form a polyurethaneurea coating on said substrate.
3 more elements
Dependencies are inferred from the claim text.