Infrared reflecting material processing method

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PROBLEM TO BE SOLVED : To provide an infrared reflective material which can suppress a water elution property and can be used for a long period. SOLUTION : The infrared reflective material containing at least one selected from alkaline earth metal elements, a chromium element, a manganese element, an iron element, a copper element, and rare-earth elements is baked. The temperature of baking treatment preferably ranges from 200 to 1, 500°C. The infrared reflective material subjected to the baking treatment in such a manner has a sufficient infrared reflective ability, is further hard to dissolve in water, has a low degradation in the infrared reflective ability due to elution, can therefore be used for a long period, and can be painted on the roof or external wall of an architectural structure, be made into a resin composition for a film, a sheet, etc., and be painted on a road or a foot path to be utilized for, e.g., relieving a heat island phenomenon. COPYRIGHT : (C)2011, JPO&INPIT