Patent ID: 10442905

Abstract:
The invention provides a polyurethane pultrusion article comprising a polyurethane pultrusion composite and a coating layer applied thereon, wherein the polyurethane pultrusion composite comprises a polyurethane resin matrix and a reinforcement material, and is prepared by a polyurethane pultrusion process, wherein the polyurethane resin matrix is prepared from a polyurethane composition comprising: A) an isocyanate component comprising one or more polyisocyanates; B) an isocyanate-reactive component comprising: b1) a first polyether polyol having a functionality of 2-3 and a hydroxyl number of 10-120 mgKOH/g; b2) a second polyether polyol having a functionality of 3-8 and a hydroxyl number of 810-1900 mgKOH/g; b4) one or more isocyanate-reactive flame retardants. The polyurethane pultrusion article provided by the invention has both favorable flame retardance and good adhesion between the coating layer and the composite.