| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a rigid polyurethane foam, which is excellent in dimensional stability and adhesiveness and in which generation of voids and disarrangement of cells hardly occur even when a large amount of water is used as a foaming agent; and to provide a heat insulating material constituted of the rigid polyurethane foam. SOLUTION: The method for producing a rigid polyurethane foam having a density of 8-35 kg/m<SP>3</SP>includes reacting a polyol component having a hydroxyl value of 200-500 mg-KOH/g with a polyisocyanate component using a catalyst for producing polyurethane, containing (1) a specific amine compound having a hydroxyl group and/or a specific amine compound having an amino group, (2) a specific amine compound having a hydroxyl group, and (3) a specific imidazole compound in the presence of 4 pts.wt. of water with respect to 100 pts.wt. of polyol component. The heat insulating material is constituted of the rigid polyurethane foam provided by the production method. COPYRIGHT: (C)2009,JPO&INPIT |
