| 摘要 |
PURPOSE:To obtain a foamed heat insulation material without detriment to the foam properties such as density while resolving an environmental problem such as the destruction of the ozone layer by using a specified chlorofluorocarbon, as a blowing agent, and a specified polyol, specifying the NCO/OH equivalent ratio and using a specified catalyst. CONSTITUTION:A foamed heat insulation material formed by mixing under agitation an organic polyisocyanate with a polyol, a catalyst, a foam stabilizer and a blowing agent comprising, 1,1-dichloro-1-fluoroethane, 2,2-dichloro-1,1,1- trifluoroethane or a mixture thereof and foaming the mixture, wherein the polyol is a mixture containing at least 20 wt.% polyether polyol prepared by using trimethylolpropane as an initiator, the equivalent ratio of the NCO groups of the organic polyisocyanate to the OH groups of the polyol is 1.3-3.0, and the above catalyst is an isocyanate trimerization catalyst or its mixture. |
