MOISTURE REGULATING MATERIAL USABLE REPEATEDLY AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To provide the moisture regulating material useful as the repeatedly usable moisture regulating material for dew condensation regulation and to provide its production method. SOLUTION: The composite of a porous metal hydroxide and a by-product having hydroscopicity is produced, by precipitating a metal hydroxide by adjusting the hydrogen ion concn. of a metal chloride aq. soln. with ammonia water, etc., and subjecting the hydroxide gel obtained by agitating the hydroxide in a hot water bath to heat treatment at the temp. at which a hygroscopic by-product is not thermally decomposed. In this way, the moisture regulating material for dew condensation usable repeatedly by absorbing the water vapor more than 60% of one's weight under the high humidity condition of >=80% relative humidity and easily releasing the water vapor under the usual humidity condition of <=60% relative humidity is provided.