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US 10,066,121 B2Granted
Two-part polyurethane erosion resistant coatings
Assignee3M Innovative Properties Company
InventorsBjörn Weber, Frans A. Audenaert
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Abstract
The present disclosure relates to two-part polyurethane coatings having excellent erosion resistance and comprising a compound having a fluorinated segment. Additionally, these two-part polyurethane coatings can be cured under high relative humidity conditions. The present disclosure also relates to articles coated with those two-part polyurethane coatings and to methods of reducing erosion in an article, among other embodiments.
Claims11
A wind turbine blade having coated thereon a fluorinated alcohol-containing two-part polyurethane composition comprising:
- an isocyanate composition comprising polyisocyanate molecules, each molecule having two or more isocyanate moieties;
- wherein from 95% to 100% of the polyisocyanate molecules have two isocyanate moieties each and from 0% to 5% of the polyisocyanate molecules have three or more isocyanate moieties each;
- and
- a hydroxyl composition comprising:
- polyol molecules, each molecule having two or more hydroxyl moieties;
- wherein from 95% to 100% of the polyol molecules have two hydroxyl moieties each and from 0% to 5% of the polyol molecules have three or more hydroxyl moieties each;
- and
- a fluoroalkyl sulfonamide diol of the formula:
- wherein:
- n is an integer from 1 to 16;
- u is an integer from 1 to 20;
- v is an integer from 1 to 20, and
- wherein the two-part composition, when mixed, coated on a substrate, and cured, has a rain erosion resistance longer than 9 hours measured according to method ASTM G73-10 using a coating of 300 μm, and
- wherein the elongation at break point is higher than 300% when the two-part composition is cured at a temperature of 23° C. and relative humidity of at least 60%.
11 more elements
Dependencies are inferred from the claim text.