Polyurethane Composites:New Alternative to Polyester ft Vinyl Ester

摘要

High toughness,fast cure,and no styrene fumes are taking urethane composites beyond SRIM into pultrusion,filament winding,vacuum infusion,and spray-up.Gains in processing know-how and advances in reactivity control to extend working time have placed polyure-thane in the running for composite applications long dominated by unsaturated polyesters and vinyl esters.In the last two decades,PUR composites made inroads primarily in foamed structural RIM(SRIM)automotive interior and exterior parts such as pickup truck boxes,load floors,package shelves,and inner door panels.Such applications have gained PUR 3% to 5% of the long-fiber and continuous-fiber composite market.