Rapid cure polysulfide coatings for cavitation resistance, erosion resistance, and sound damping
View Patent ↗A polysulfide coating composition includes an aliphatic, aromatic or cycloaliphatic material with at least 2 thiol groups; an aliphatic, aromatic or cycloaliphatic, acryl, polyester or polysiloxane-based material with at least two epoxy groups; and a catalyst. The coating provides a durable cavitation- and erosion-resistant coating for the rudders of ships, and is also suitable for sound-damping applications.
1. A polysulfide coating composition comprising:
an aliphatic or cycloaliphatic material comprising a thiocarbamate linkage and at least 2 thiol groups;
an aliphatic, aromatic or cycloaliphatic, acryl, polyester or polysiloxane-based material with at least two epoxy groups;
a polyamide polymer; and
a catalyst.
2. The coating composition of claim 1 , wherein said aliphatic, aromatic or cycloaliphatic, acryl, polyester or polysiloxane-based material has at least one epoxy group.
3. The coating composition of claim 1 , wherein said catalyst is an aliphatic amine, cycloaliphatic amine, aromatic amine, or a Lewis Acid.
4. The coating composition of claim 1 , further comprising a pigment and/or a filler.
5. The coating composition of claim 1 , wherein the composition contains no solvent.
6. The composition of claim 1 , wherein the composition provides cavitation and erosion resistance for rudders.
7. The coating composition of claim 1 , wherein the composition provides sound damping.
8. A polysulfide coating composition comprising:
an aliphatic or cycloaliphatic material comprising a thiocarbamate linkage and at least 2 thiol groups;
an aliphatic, aromatic or cycloaliphatic, acryl, polyester or polysiloxane-based material with at least two epoxy groups;
a polyamide polymer; and
a tertiary amine catalyst.
9. The coating composition of claim 8 , further comprising a pigment and/or a filler.
10. The coating composition of claim 8 , wherein the composition contains no solvent.
11. The coating composition of claim 8 , wherein the composition provides sound damping.
12. The composition of claim 8 , wherein the composition provides cavitation and erosion resistance for rudders.
13. A polysulfide coating composition comprising:
a thiol-terminated material comprising a thiocarbamate linkage and at least two reactive thiol groups and an aliphatic, cycloaliphatic or aromatic backbone, selected from the group consisting of adducts of trimethylolpropane tris(3-mercaptopropionate) with 1,6-hexamethylenediisocyanate (HDI), trimethylolpropane tris(3-mercaptopropionate) with isophorone diisocyanate (IPDI), trimethylolpropane tris(3-mercaptopropionate) with meta-tetramethylxylylene diisocyanate (TMXDI), trimethylolpropane tris(3-mercaptopropionate) with methylene diphenyl diisocyanate (MDI), and trimethylolpropane tris(3-mercaptopropionate) with polyisocyanates based on HDI and IPDI;
diglycidyl ether of hydrogenated Bisphenol A (Hydrogenated DGEBA); and
a catalyst.