| 摘要 |
PURPOSE:A heat storage material for heating of construction, etc., having improved long-term stability, by polymerizing a monomer such as unsaturated carboxylic acid, organic unsaturated sulfonic acid, etc., with a polyfunctional monomer in the presence of sodium sulfate, water and a polymerization initiator. CONSTITUTION:In the presence of (A) sodium sulfate or its eutectic crystal salt (e.g., eutectic crystal with sodium chloride), (B) water and (C) a polymerization initiator (preferably redox polymerization initiator such as ammonium peroxydisulfate-sodium thiosulfate, etc.,), (D) preferably 2-5wt% one or more monomers selected from an unsaturated carboxylic acid (e.g., acrylic acid, etc.,), an organic unsaturated sulfonic acid (e.g., 2-acrylamido-2-methylpropanesulfonic acid, etc.,) and its salt is polymeized with (E) preferably 0.05-0.5wt% polyfunctional monomer (e.g., N,N'-methylenebisacrylamide, etc.,), to give the aimed heat storage material consisting of a composition of the component A and a crosslinked polymer. |
