VISCOUS-ELASTIC SOUND-ABSORBING POLYURETHANE FOAM AND PREPARATION METHOD THEREFOR

摘要

Disclosed in the present invention are a viscous-elastic sound-absorbing polyurethane foam and a method for preparing same, the foam being prepared by reacting a polyisocyanate composition and an isocyanate reactive component. The isocyanate reactive component comprises, based on the weight of a mixed polyether, 30-80 wt% of (bii) a copolyol of epoxypropane-epoxyethane or a conjugate thereof, with a content of oxy-ethidene units being 5-35 wt%; 2-20 wt% of (biii) a copolyol of epoxypropane-epoxyethane or a conjugate thereof, with a content of oxy-ethidene units being 70-100 wt%; 20-70 wt% of (biv) a copolyol of epoxypropane-epoxyethane or a conjugate thereof, with a content of oxy-ethidene units being 0-20 wt%. The sound-absorbing foam of the present invention has a ball resilience rate of 15-30%, and good sound-absorbing properties.