Polyurethane (PU), uas nws lub npe tag nrho yog polyurethane, yog ib qho polymer compound.Nws tau tsim los ntawm Otto Bayer thiab lwm tus hauv xyoo 1937. Polyurethane muaj ob pawg: hom polyester thiab hom polyether.Lawv tuaj yeem ua rau hauv cov yas polyurethane (tsuas yog ua npuas ncauj), polyurethane fibers ...
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