Coating material composition, coatings produced therefrom and the use thereof as erosion protection
Coating material compositions are used for producing particularly erosion-stable coatings which are used as erosion protection, in particular as edge protection for rotor blades. The composition includes a stock component and a hardener component, wherein the stock component includes at least one trifunctional polycaprolactone polyol or at least one polycarbonate diol or at least one trifunctional polycaprolactone polyol and a polycarbonate diol and the hardener component includes at least one crystallization-resistant, isocyanate-functional prepolymer.
1. A composition for the production of an erosion protection coating comprising a binder component and a hardener component, with the binder component having at least one trifunctional polycaprolactone polyol or at least one polycarbonate diol or at least one trifunctional polycaprolactone polyol and one polycarbonate diol, and with the hardener component having at least one crystallization stable isocyanate-functional prepolymer obtained by reaction of 1,5-diisocyanatopentane and/or 1,6-diisocyanatohexane with (A) at least one polyester polyol of mean functionality from 1.9 to 2.3 and an average molar mass of 300 to 3000 g/mol, and with (B) at least one polycaprolactone polyester of mean functionality from 2.0 to 3.0 and an average molar mass of 176 to 2000 g/mol, and
wherein the binder component has an NH content of 0.42 to 1.0 mol/kg.
2. The composition according to claim 1 , wherein the binder component comprises furthermore at least one secondary diamine.
3. The composition according to claim 1 , wherein the binder component has an OH content of between 0.55 and 1.75 mol/kg.
4. The composition according to claim 1 , wherein the binder component has an NH content of approx 0.83 mol/kg.
5. The composition according to claim 1 , wherein the binder component has a mass ratio of polyaspartic esters to polyols of 0.8:1 to 1:1.2.
6. The composition according to claim 1 , wherein the polyester polyols (A) are prepared by reaction of aliphatic dicarboxylic acids or anhydrides thereof having 4 to 12 carbon atoms with polyhydric aliphatic or cycloaliphatic alcohols having 2 to 18 carbon atoms, and wherein the polyester polyols (B) are prepared by ring-opening polymerization of s-caprolactones with polyhydric aliphatic or cycloaliphatic alcohols having 2 to 18 carbon atoms as starter molecules.
7. The composition according to claim 1 , wherein the hardener component has NCO contents from 1.5 to 6 mol/kg.
8. The composition according to claim 1 , wherein the hardener component contains HDI and/or PDI oligomers.
9. The composition according to claim 1 , wherein the volumetric mixing ratio of the binder component and the hardener component lies between 0.9:1 and 1:1.2.
10. The composition according to claim 1 , wherein the composition contains furthermore pigments and/or fillers.
11. The composition according to claim 1 , wherein the composition contains furthermore a molecular sieve.
12. An erosion protection coating comprising the composition according to claim 1 .
13. A component comprising the erosion protection coating according to claim 12 .
14. The component according to claim 13 , wherein the component is a rotor blade of a wind power plant or of a helicopter, an aircraft wing or a marine screw propeller.
15. The component according to claim 13 , comprising at least one edge, wherein the coating is positioned on the at least one edge for edge protection.