Two-component coating composition, method for coating a substrate, coated substrate, and use of such coating composition for improving erosion resistance

A substrate coated with an erosion resistant coating composition, the substrate being selected from wind turbine rotor blades and helicopter rotor, blades, and the erosion resistant coating composition being a two-component erosion resistant coating composition comprising:

• i) a base component comprising:
• (A) a di-amine resin with two secondary amine groups of general formula
• (b2)-NH-(b1)-NH-(b2)
• wherein
• (b1) is a cycloaliphatic hydrocarbon group;
• and (b2) is, independently, selected from the group consisting of
• —CnH2n—CN wherein n is an integer in the range of from 2 to 6, —CH2CH2—C(O)—O—CmH(2m+1) or —CH2CH(CH3)—C(O)—O—CmH(2m+1) wherein m is an integer in the range of from 1 to 6 alkyl radicals with 2 to 10 carbon atoms, and halogenated alkyl radicals with 2 to 10 carbon atoms;
• and
• ii) a curing component comprising:
• (B) a polyisocyanate prepolymer having two free isocyanate groups and an isocyanate content in the range of from 3 wt % to 9 wt %, based on solid weight of the polyisocyanate prepolymer;
• and
• (C) optionally up to 3 wt % of a polyisocyanate with more than two free isocyanate groups, based on the total weight of polyisocyanates (B) and (C),
• wherein the two-component erosion resistant coating composition comprises less than 5 wt % of polyol resin.