Urethane and refrigerator comprising same

A method of manufacturing a urethane, the method comprising:

• forming a urethane polymer by reacting a polyol solution with isocyanate;
• and
• forming cells by adding a blowing agent and a foam stabilizer for cell formation,
• wherein a catalyst is used to control reaction rates of the urethane polymer-forming operation and the cell-forming operation, and
• the polyol solution, the isocyanate, the blowing agent, the foam stabilizer, and the catalyst are comprised as follows:
• about 100 parts by weight of the polyol solution, about 100 to 120 parts by weight of the isocyanate, about 30 parts by weight or less of the blowing agent, about 1 to 3 parts by weight of the foam stabilizer, and about 1 to 8 parts by weight of the catalyst are comprised based on the 100 parts by weight of the polyol solution.

A refrigerator comprising:

• an outer cabinet;
• an inner cavity within the outer cabinet;
• and
• a urethane between the outer cabinet and the inner cavity, the urethane comprises:
• a plurality of closed cells containing inside gas;
• a plurality of open cells connected to outside air;
• and cell walls disposed
• between at least one of the plurality of closed cells and at least one of the plurality of open cells or
• between the plurality of closed cells to connect the at least one of the plurality of closed cells with the at least one of the plurality of open cells or to connect the plurality of closed cells,
• wherein diameters of a closed cell of the plurality of closed cells and an open cell of the plurality of open cells are about 100 to 200 μm.