| abstract |
Provided is a method for producing a light rigid urethane foam superior in moldability (cell interconnection, spraying thickness, adhesiveness, etc.), heat-insulating efficiency, and others by a spraying method, using water as foaming agent. A method for producing an open-cell polyurethane foam, comprising obtaining the open-cell polyurethane foam by mixing and reacting a polyol composition containing a polyol compound, water as a foaming agent, a foam stabilizer, a catalyst, and a flame retardant with a polyisocyanate compound by a spraying method, the polyol compound containing polyols (A), (B), and (C) at a polyol (A) content of 10 to 40 wt parts, a polyol (B) content of 10 to 70 wt parts, and a polyol (C) content of 10 to 70 wt parts. |