RIGID POLYURETHANE FOAM COMPOSITION COMPRISING 4,4'-DIPHENYLMETHANE DIISOCYANATE(MDI) AND POLYOL MIXTURE AND COLD INSULATION MATERIAL USING THE SAME

摘要

PURPOSE: A rigid polyurethane foam composition is provided to improve flame retardancy including self-extinguishing property, heat insulating properties and mechanical properties such as compression strength, by using an environmentally friendly foaming agent, cyclopentane. CONSTITUTION: The rigid polyurethane foam composition comprises 4,4'-diphenylmethane diisocyanate(MDI) and a polyol mixture consisting of: (a) 30-70wt% of a polyether polyol prepared from addition polymerization of pentaerythritol with propylene oxides and ethylene oxides; (b) 10-30wt% of a polyether polyol prepared from addition polymerization of sucrose with ethylene oxides and propylene oxides; (c) 10-40wt% of a polyester polyol prepared from addition polymerization of phthalic anhydride with ethylene oxides and propylene oxides; and (d) 5-30wt% of a polyether polyol prepared from addition polymerization of glycerin having bromine substituents with ethylene oxides and propylene oxides, in which NCO/OH ratio is 1.0-1.4.