| 摘要 |
PURPOSE:To obtain a foamed heat insulating material capable of solving environmental problem without damaging physical properties of foam by blending an organic polyisocyanate with foam stabilizer, active hydrogen-catalyst concentration, specific blowing agent and polyether polyol while stirring, expanding and forming foam. CONSTITUTION:(A) An organic polyisocyanate is blended with (B) a foam stabilizer, (C) a catalyst (e.g. dimethylethanolamine) containing active hydrogen to be reacted with the component A, (D) 1,1-dichloro-1-fluoroethane or 2,2- dichloro-1,1,1-trifluoroethane having little influence on ozone destruction as a blowing agent and (E) a polyether polyol while stirring and expanded into foam to give a foamed heat insulating material. Since the prepared foamed heat insulating material has excellent physical properties of foam because the catalyst C rapidly starts reaction with the component A, generates reaction heat and the blowing agent D quickly starts foaming by the reaction heat and contributes to formation of foam. |
