Aliphatic polyurea-polyurethane coatings for polyurea-polyurethane composite structures

A method of manufacturing a composite structure, the method comprising the steps of:

• applying a first polyurea-polyurethane coating upon a surface of a mold, the surface defining a geometry corresponding to the composite structure to be manufactured, the polyurea-polyurethane coating being formed upon the mold via applying at least an isocyanate composition and a resin composition to the surface of the mold with a plural component spray system, the material pressures of the isocyanate composition and the resin composition each independently ranging from 1,000 psi to 4,000 psi when being applied, the temperature of the isocyanate composition and the resin composition each independently ranging from 90 degrees Fahrenheit to 160 degrees Fahrenheit when being applied, the plural component spray system comprising a dry air and oil filter membrane media, the polyurea-polyurethane coating comprising the cured reaction product of the isocyanate and resin compositions;
• allowing the first polyurea-polyurethane coating to cure to form the composite structure;
• and
• removing the composite structure from the mold;
• wherein the isocyanate composition comprises:
• isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI), hydrogenated MDI (H12MDI), dimer polyisocyanates, trimer polyisocyanates, or combinations thereof;
• and
• wherein the resin composition comprises:
• a UV absorber;
• titanium dioxide;
• a polyamine;
• a dispersion agent;
• a flow agent;
• an air release agent;
• a crosslinking agent;
• a surface tension reducing agent;
• an anti-settling agent
• an anti-oxidant;
• a moisture scavenger;
• a wetting agent;
• and a stain repellant additive;
• a tertiary amine, tin based and metal catalysts combination;
• and
• a filler.