| 摘要 |
PURPOSE:To obtain a foamed heat insulating material having excellent thermal conductivity by mixing polyether polyol, foam stabilizer, catalyst, specific blowing agent, graphite powder and zeolite powder to give a component, blending the component with organic polyisocyanate component and expanding to form foam. CONSTITUTION:(A) A polyol component obtained by blending polyether polyol with a foam stabilizer, a catalyst, 1,1-dichloro-1-fluoroethane or 2,2-dichloro-1,1,1- trifluoroethane having little influence of ozone destruction as a blowing agent, graphite powder and zeolite powder is blended with (B) and isocyanate component comprising an organic polyisocyanate in a given ration and expanded by a high-pressure foaming machine to give a foamed heat insulating material. Even though the prepared foamed heat insulating material uses a blowing agent having high thermal expansion of gas, the foamed heat insulating material has excellent thermal conductivity by effects of graphite powder and zeolite powder. |
