| 摘要 |
PURPOSE:To obtain the subject heat insulating material excellent in heat insulating properties with a uniform density without any danger of destroying ozonosphere by using monochlorodifluoromethane adsorbed on silica gel particles and isopentane as a foaming agent. CONSTITUTION:The objective heat insulating material obtained by adsorbing monochlorodifluoromethane gas on silica gel particles according to a column aeration method, etc., mixing the resultant gas adsorbed silica gel with isopentane and mixing the prepared mixture as a foaming agent with a urethane raw material. |
