| 摘要 |
A water-foamed polyurethane composition having an ultra-low density, and a method for preparing a water-foamed polyurethane foam by using the composition are provided to remove smell, to prevent the generation toxic gas in case of a fire and to lower cost by using water as a foaming agent. A water-foamed polyurethane composition comprises a resin premix; and methylene diphenyl diisocyanate in a ratio of NCO/OH of 1.0-1.4. The resin premix comprises 80-90 parts by weight of a polyol mixture which comprises 10-40 wt% of a sucrose-based polyether polyol having an average functionality of 2-6 and an average hydroxyl number of 300-600 mg KOH/g, 5-30 wt% of a glycol ether polymer having an average molecular weight of 200-800, 5-30 wt% of a polyether polyol having an average functionality of 2-5 and an average hydroxyl number of 50-200 mg KOH/g, and 10-40 wt% of a polyester polyol prepared by the addition polymerization of phthalic anhydride, ethylene oxide and propylene oxide; 3-15 parts by weight of water as a foaming agent; 0.0001-10 parts by weight of an amine-based catalyst; and 0.0001-5 parts by weight of an antifoaming agent.
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