Coating composition for wind turbine blades
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United States of America Patent
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Sep 12, 2017
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app pub date -
Apr 23, 2010
filing date -
Apr 24, 2009
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Abstract
The present application discloses a wind turbine blade having on the outer surface thereof a polyurethane-based coating including a polyurethane binder prepared from polyol(s) having an average functionality of ≧2.0 and <8.0; at least 50% (w/w) of the polyols have aliphatic polyester segments included therein and have a Mw of 300-3,000 g/mol; and polyisocyanate(s) having an average functionality of <3.0; at least 50% (w/w) of the polyisocyanate(s) are selected from: (i) polyisocyanates having aliphatic polyester segments included therein, and having a molecular weight of 500-3,000 g/mol and a functionality of ≧2.0 and <3.0; (ii) polyisocyanates of the allophanate type having a Mw of 250-2,000 g/mol and a functionality of ≧2.0 and <3.0; and (iii) polyisocyanates of the uretdion type having a Mw of 250-2,000 g/mol and a functionality of ≧2.0 and <3.0. The application also discloses corresponding coating compositions and a method for coating a substrate.
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