Synthesis and Properties of Colored Polyurethane

Colored polyurethane has been synthesized by reaction of 4 ,4'-methylene diphenyl diisocyanate (MDI) with the hydroxy-terminated dye Reactint Black. The molecular structure of the colored polyurethane was characterized by FT-IR spectroscopy. This colored polyurethane was used as a polymeric dye to color polyurethane resin and the color fastness,solvent resistance,and thermal-mechanical properties of the resulting colored polyurethane resin and the colored polyurethane itself were studied. The results showed that:the colored polyurethane and the colored polyurethane resin had excellent color fastness,with the fastness to dry or wet rubbing being 5; the solvent resistance of the colored polyurethane was the same as the polyurethane resin,and there were no dissolution or fading phenomena; the glass transition temperature of the colored polyurethane was close to that of the polyurethane resin. The colored polyurethane can be used as a high performance polymeric dye to color polyurethane.