| 摘要 |
PROBLEM TO BE SOLVED: To provide a rigid polyurethane foam that achieves combination of a low heat conductivity and a low density and has a reduced deterioration with time of heat conductivity and a high dimensional stability. SOLUTION: The rigid polyurethane foam is formed by using a polyol, an isocyanate, a mixed foaming agent of cyclopentane and water, a catalyst and a foam stabilizer. The polyol contains a polyether polyol component in which propylene oxide is added to tolylenediamines as a first polyol component, a polyether polyol component in which propylene oxide is added to triethanolamines as a second polyol component, and an aromatic polyester polyol as a third polyol component. The polyol contains the first and the second polyol components each≥6 times of the third polyol component. COPYRIGHT: (C)2004,JPO |
