| 摘要 |
<p>A heat insulator including a foamed polyurethane resin is provided in which all of the low density, high strength, and heat-insulating properties of the foamed polyurethane resin and high flowability can be easily attained. Raw materials can be easily taken charge of, procured, and produced, and production cost can be inhibited from rising high. The insulator comprises an outer face material (102), an inner face material (103), and a foamed polyurethane resin (104) filling the space therebetween. The foamed polyurethane resin (104) is a foam obtained by: injecting, into the space, a mixture comprising a polyol ingredient, a polyisocyanate ingredient, a first blowing agent which has a boiling point at atmospheric pressure of 0°C or lower and is in a supercritical, subcritical, or liquid state, and a second blowing agent which is liquid, has a lower thermal conductivity than the first blowing agent, and comprises a hydrocarbon which is liquid at ordinary temperature; and foaming and curing the mixture.</p> |
