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Hempel patents coating for wind turbine blades

Published October 6, 2011
Patent No. WO2010122157
Improved coating composition for wind turbine blades (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 at least 2.0 and less than 8.0, at least 50% (vv/w) of the polyols have aliphatic polyester segments included therein and have a Mw of 300-3000 g/mol and polyisocyanate(s) having an average functionality of less than 3.0. At least 50% (w/vv) 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 at least 2.0 and less than 3.0, (ii) polyisocyanates of the allophanate type having a MW of 250-2000 g/mol and a functionality of at least 2.0 and less than 3.0, and (iii) polyisocyanates of the uretdione type having a MW of 250-2000 g/mol and a functionality of at least 2.0 and less than 3.0. Corresponding coating compositions and a method for coating a substrate are also disclosed).

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