A polyurethane or polyurea coating composition for use in protecting a leading edge substrate on an airfoil, such as aircraft wings, rotor blades and propeller blades, against liquid or solid particle erosion, the composition made from a polyisocyanate and curing agents, such as polyaspartic esters,
A polyurethane or polyurea coating composition for use in protecting a leading edge substrate on an airfoil, such as aircraft wings, rotor blades and propeller blades, against liquid or solid particle erosion, the composition made from a polyisocyanate and curing agents, such as polyaspartic esters, aldimines and ketimines, polyamines and polyols or mixtures thereof with optional flatting agent for matte coatings.
대표청구항▼
1. A polyurethane coating composition for protecting a leading edge substrate on an airfoil against liquid and solid particle erosion, comprising: a) a curing agent selected from one or more Group A polyols having at least two hydroxyl groups per molecule;b) one or more isocyanate-terminated prepoly
1. A polyurethane coating composition for protecting a leading edge substrate on an airfoil against liquid and solid particle erosion, comprising: a) a curing agent selected from one or more Group A polyols having at least two hydroxyl groups per molecule;b) one or more isocyanate-terminated prepolymers prepared from reaction of: i) one or more Group B polyols having at least two hydroxyl groups per molecule with:ii) a diisocyanate or polyisocyanate selected from the group consisting of 1,6-hexamethylene diisocyanate (HDI), 2,2,4-trimethyl-1,6-hexamethylene diisocyanate, 2,4,4-trimethyl-1,6-hexamethylene diisocyanate, dodecamethylene diisocyanate, 1,4-diisocyanatocyclohexane, 1-isocyanato-3,3,5-trimethy-5-isocyanatomethylcyclohexane (IPDI), 2,4′-diisocyanato-dicyclohexyl methane, 4,4′-diisocyanato-dicyclohexyl methane, 2,4-diisocyanato-diphenyl methane, 4,4′-diisocyanato-diphenyl methane, 2,4-toluene diisocyanate and/or 2,6-toluene diisocyanate, p-phenylene diisocyanate (PPDI); diphenyl-4,4′-diisocyanate; dibenzyl-4, 4′-diisocyanate; stilbene-4,4′-diisocyanate; benzophenone-4,4′-diisocyanate; 1,3- and 1,4-xylene diisocyanates; 1,3-cyclohexyl diisocyanate, 1,4-cyclohexyl diisocyanate (CHDI), the saturated diphenylmethane diisocyanate (H12MDI), bis[4-isocyanatocyclo hexyl]methane, 4,4′-methylene dicyclohexyl diisocyanate, 4,4-methylene bis (dicyclohexyl) diisocyanate, methylene dicyclohexyl diisocyanate, methylene bis (4-cyclohexylene isocyanate), saturated methylene diphenyl diisocyanate, saturated methyl diphenyl diisocyanate), isophorone diisocyanate (IPDI), polyisocyanates containing biuret groups, polyisocyanates containing isocyanurate groups, polyisocyanates containing urethane groups, polyisocyanates containing carbodiimide groups, polyisocyanates containing allophanate groups, N,N′,N″-tris-(6-isocyanatohexyl)-biuret, N,N′,N″-tris-(6-isocyanatohexyl)-isocyanurate and mixtures thereof, said Group A polyols and Group B polyols are independently selected and may be same or different selected from the group consisting of polyester polyols, polycaprolactone polyols, polyether polyols, polyhydroxy polycarbonates, polyhydroxy polyacetals, polyhydroxy polyacrylates, polyhydroxy polyester amides, polyhydroxy polythioethers and mixtures thereof, and said polyurethane coating composition in dry cured form having a tensile strength from 1000 psi (70 kg/cm2) to 7233 psi (508 kg/cm2), an elongation at break from 350% to 1250%, a tensile set after break from 10% to 150% and a Shore A hardness of 44A to 95A as measured at 68° F. 2. The coating composition of claim 1 further comprising: a flatting agent selected from the group consisting of organic and inorganic particles, silica, polymeric beads, talc, alumina, calcium carbonate, urea-formaldehydes and mixtures thereof, said polyurethane rain erosion resistant coating composition in dry cured form having a tensile strength from 1000 psi (70 kg/cm2) to 7233 psi (508 kg/cm2), an elongation at break from 350% to 1250%, a tensile set after break from 10% to 150% and a Shore A hardness of 44A to 95A as measured at 68° F. 3. The coating composition of claim 2 wherein the flatting agent is selected from the group consisting of silica, polymeric beads and urea-formaldehydes. 4. The coating composition of claim 1 wherein said airfoil is selected from the group consisting of an aircraft wing, a rotor blade, a propeller blade, a nose cone, a radome, a fan blade and an antenna. 5. The coating composition of claim 1 wherein the isocyanate-terminated prepolymer has an isocyanate content of about 0.5 to about 40 weight percent, based on the weight of the isocyanate-terminated prepolymer after reaction. 6. The coating composition of claim 1 wherein the isocyanate-terminated prepolymer has an isocyanate content of about 1 to about 20 weight percent based on the weight of the isocyanate-terminated prepolymer after reaction. 7. The coating composition of claim 1, wherein the polyisocyanate is hexamethylene diisocyanate (HDI) or 1-isocyanato-3,3,5-trimethy-5-isocyanatomethylcyclohexane (IPDI). 8. The coating composition of claim 1 wherein Group A polyols and Group B polyols are each selected from the group consisting of 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, polyether polyol, polyester polyols, polycaprolactone polyols, polyether polyols, polyhydroxy polycarbonates, polyhydroxy polyacetals, polyhydroxy polyacrylates, polyhydroxy polyester amides, polyhydroxy polythioethers and mixtures thereof. 9. The coating composition of claim 1 wherein Group A polyols and Group B polyols are each selected from the group consisting of polyester polyols, polycaprolactone polyols, polyether polyols, polyhydroxy polycarbonates, polyhydroxy polyacetals, polyhydroxy polythioethers and mixtures thereof. 10. The coating composition of claim 1 wherein Group A polyols and Group B polyols are each selected from the group consisting of polyester polyols, polyether polyols, polyesters derived from lactones and mixtures thereof. 11. The coating composition of claim 1 wherein the polyisocyanate is hexamethylene diisocyanate (HDI) or 1-isocyanato-3,3,5-trimethy-5-isocyanatomethylcyclohexane (IPDI) and the curing agent is a polyol selected from the group consisting of 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol and mixtures thereof. 12. The coating composition of claim 1, wherein the polyisocyanate is hexamethylene diisocyanate (HDI) and Group A polyols and Group B polyols are each selected from the group consisting of 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, and mixtures thereof. 13. The coating composition of claim 1, wherein the polyisocyanate is hexamethylene diisocyanate (HDI) or 1-isocyanato-3,3,5-trimethy-5-isocyanatomethylcyclohexane (IPDI) and Group A polyols and Group B polyols are independently selected from the group consisting of polyester polyols, polycaprolactone polyols, polyether polyols, polyhydroxy polycarbonates, polyhydroxy polyacetals, polyhydroxy polyacrylates, polyhydroxy polyester amides, polyhydroxy polythioethers, and mixtures thereof. 14. The coating composition of claim 1 wherein the Group A polyols and Group B polyols are independently selected from the group consisting of polyester polyols, polycaprolactone polyols, polyether polyols, polyhydroxy polycarbonates, polyhydroxy polyacetals, and mixtures thereof. 15. The coating composition of claim 1 wherein the Group A and Group B polyether polyols are obtained by the chemical addition of alkylene oxides, ethylene oxide, propylene oxide and mixtures thereof, to polyhydric alcohols selected from consisting of ethylene glycol, propylene glycol, trimethylene glycol, 1,2-butylene glycol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, cyclohexane dimethanol (1,4-bis-hydroxymethylcyclohexane), 2-methyl-1,3-propanediol, 2,2,4-trimethyl-1,3-pentanediol, triethylene glycol, tetraethylene glycol, polyethylene glycol, dipropylene glycol, polypropylene glycol, polytetramethylene glycol, dibutylene glycol and polybutylene glycol, glycerine, trimethylolpropane, and mixtures thereof. 16. The coating composition of claim 1 wherein the Group A polyols comprise a first polyol and a second polyol different from the first polyol. 17. The coating composition of claim 1 wherein the Group A polyols comprise a first polyol selected from the group consisting of polyether polyols and a second polyol selected from the group consisting of polyester polyols. 18. The coating composition of claim 1 wherein the Group B polyols are independently selected from the group consisting of polyester polyols, polycaprolactone polyols, polyether polyols, polyhydroxy polycarbonates and mixtures thereof. 19. The coating composition of claim 1 wherein the Group A polyols comprise a first polyol and a second polyol and a third polyol all polyols being independently selected from the group consisting of polyester polyols, polycaprolactone polyols, polyether polyols, polyhydroxy polycarbonates and mixtures thereof. 20. The coating composition of claim 1 wherein the Group B polyols are independently selected from the group consisting of polyester polyols, polycaprolactone polyols, polyether polyols, polyhydroxy polycarbonates and mixtures thereof. 21. The coating composition of claim 1 wherein the Group A polyols and Group B polyols are independently selected from the group consisting of polyester polyols, polycaprolactone polyols, polyether polyols, polyhydroxy polycarbonates and mixtures thereof. 22. The coating composition of claim 1 wherein the Group B polyols are selected from the group consisting of polyester polyols, polyether polyols, polyesters derived from lactones and mixtures thereof. 23. The coating composition of claim 1 wherein the Group B polyols are polycaprolactone polyols. 24. The coating composition of claim 1 wherein the Group B polyols are polyesters derived from ε-caprolactone or ω-hydroxycaproic acid. 25. The coating composition of claim 1 wherein the Group B polyols are polyesters derived from ε-caprolactone. 26. The coating composition of claim 1 wherein the Group B polyols are polyesters derived from ω-hydroxycaproic acid. 27. The coating composition of claim 1 wherein polyisocyanate is selected from the group consisting of 1,6-hexamethylene diisocyanate (HDI), 2,2,4-trimethyl-1,6-hexamethylene diisocyanate, 2,4,4-trimethyl-1,6-hexamethylene diisocyanate, dodecamethylene diisocyanate, 1,4-diisocyanatocyclohexane, 1-isocyanato-3,3,5-trimethy-5-isocyanatomethylcyclohexane (IPDI), 2,4′-diisocyanato-dicyclohexyl methane, 4,4′-diisocyanato-dicyclohexyl methane, 2,4-diisocyanato-diphenyl methane, 4,4′-diisocyanato-diphenyl methane, 2,4-toluene diisocyanate and/or 2,6-toluene diisocyanate, p-phenylene diisocyanate (PPDI); diphenyl-4,4′-diisocyanate; dibenzyl-4, 4′-diisocyanate; stilbene-4,4′-diisocyanate; benzophenone-4,4′-diisocyanate; 1,3- and 1,4-xylene diisocyanates; 1,3-cyclohexyl diisocyanate, 1,4-cyclohexyl diisocyanate (CHDI), the saturated diphenylmethane diisocyanate (H12MDI), bis[4-isocyanatocyclo hexyl]methane, 4,4′-methylene dicyclohexyl diisocyanate, 4,4-methylene bis (dicyclohexyl) diisocyanate, methylene dicyclohexyl diisocyanate, methylene bis (4-cyclohexylene isocyanate), saturated methylene diphenyl diisocyanate, saturated methyl diphenyl diisocyanate), isophorone diisocyanate (IPDI) and mixtures thereof. 28. The coating composition of claim 1 wherein the polyisocyanate is hexamethylene diisocyanate (HDI) or 1-isocyanato-3,3,5-trimethy-5-isocyanatomethylcyclohexane (IPDI), 1,4-cyclohexyl diisocyanate (CHDI), the saturated diphenylmethane diisocyanate (H12MDI), bis[4-isocyanatocyclo hexyl]methane, 4,4′-methylene dicyclohexyl diisocyanate, 4,4-methylene bis (dicyclohexyl) diisocyanate, methylene dicyclohexyl diisocyanate, methylene bis (4-cyclohexylene isocyanate), saturated methylene diphenyl diisocyanate, saturated methyl diphenyl diisocyanate) and mixtures thereof and the Group B polyols are polyesters derived from ε-caprolactone or ω-hydroxycaproic acid.
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