| abstract |
A polyol mixture for producing a rigid polyurethane foam, wherein (A) a polyol component having a hydroxyl value of 100 mgKOH / g to 550 mgKOH / g, (B) trans-1-chloro-3,3,3-trifluoro A foaming agent comprising one or more hydrohaloolefin-based foaming agents selected from the group consisting of -1-propene and cis-1,1,1,4,4,4-hexafluoro-2-butene, (C) A catalyst containing an imidazole catalyst represented by the formula (I), (D) an organic acid containing at least one selected from the group consisting of succinic acid and glutaric acid, and (E) a foam stabilizer. Polyol mixture. The polyurethane foam obtained by using the polyol mixture of the present invention is suitable as a building material, an electric refrigerator, a refrigerator / freezer warehouse, a heat insulating material such as a bathtub and a pipe, a dew condensation preventing material for a detached house, an apartment, an industrial pipe, and the like. It can be used. |