| 摘要 |
PURPOSE:To provide a heat-insulating box body of which the chemical attack to a synthetic resin being used for the internal box, etc., is extremely small, and the manufacturing cost of which can be low. CONSTITUTION:For a heat-insulating box body 1 such as a refrigerator, etc., in a space between an external box 2 and internal box 3, a hard polyurethane foam raw material consisting of a polyol component, isocyanate component, and a foaming material, for which water and a low ozonolysis fleon compound are jointly used, etc., is filled. At this time, by the reaction between water and the isocyanate component, carbon dioxide gas is generated. Then, if the concentration of the fleon compound in the expanded and cured hard polyurethane foam in the above mentioned space is a mole % of 15% or less to the concentration of the above mentioned carbon dioxide gas, even when an ABS resin is used for the internal box 3, cracks do not generate on the ABS resin. In this case, water is used together with above mentioned fleon compound at a high joint usage rate, and therefore, the manufacturing cost of the heat- insulating box body 1 can be reduced. |
