| 摘要 |
FIELD: heating.SUBSTANCE: heat insulation material contains a foam polyurethane resin 104, which is filled and foamed in the space between external and internal elements 102 and 103. The foam polyurethane resin 104 is produced by injection of a mixture from at least polyol component, polyisocyanate component, supercritical, subcritical or first liquid foaming substance, boiling point of which is equal to or below 0°C at atmospheric pressure, and the second liquid foaming substance, which has specific heat conductivity below specific heat conductivity of the first foaming substance and is a liquid hydrocarbon at normal temperature, into space, and also foaming and hardening of the mixture. The inner element comprises grooves or ledges.EFFECT: low temperature refrigerator may easily provide for compatible low density, high fluidity, high strength and heat insulation property of foam polyurethane resin, and may prevent increased cost of manufacturing by easy control, production or manufacturing of initial materials.25 cl, 9 dwg |
