| 摘要 |
PURPOSE:To obtain the title composition decreased in the loss of the quantity of stored heat after a melting/freezing cycle is repeated for a long time by adding a specified amount of CaCl2 to a heat storage material composition comprising a hydrate of sodium sulfate or its eutectic mixture, a water-swellable crosslinked polymer and water. CONSTITUTION:This heat storage material composition is produced by mixing a hydrate of sodium sulfate or of its eutectic mixture (e.g., an eutectic mixture of sodium sulfate with sodium chloride) with a water-swellable crosslinked polymer (e.g., an acrylic polymer crosslinked with N,N'-methylenebisacrylamide), water and 0.001-2wt.% CaCl2 based on the water of the heat storage material composition. Because CaCl2 is used and therefore the loss of the quantity of stored heat during use is small, it becomes unnecessary to use a larger amount of a heat storage material in consideration of the loss of the heat storage performance when a room heater or the like is installed in a building. |
