| 摘要 |
<p>PURPOSE: To provide insulation material of high insulation performance at low cost by providing a resinous foam comprising cells filled with inert gas having a specific heat conductivity, and enclosing this foam in a gas-impervious enclosure at a specific partial pressure and total pressure of the inert gas. CONSTITUTION: This insulation material of a low heat conductivity of 10 mW/m- deg. K or under to be effectively utilized for refrigerators and the like is produced by foaming a resinous foam in an inert atmosphere (of nitrogen, for example) using mixture of carbon dioxide and inert gas of a low heat conductivity such as krypton. This foam is then enclosed in a gas-impervious enclosure, and favorably, solid material which reacts with carbon dioxide such as an alkaline reagent is included in the enclosure, so carbon dioxide is removed from the enclosure. The final partial pressure of gas of the low heat conductivity in the enclosure is in a range of about 20-200 Torr, and total pressure is up to 110% of the partial pressure.</p> |
