| 摘要 |
PURPOSE:To obtain a low temp. heat insulating material usable for a long period, having low variably of quality, by adding a chelating agent to react with an alkaline earth metal ion to form a water-soluble chelate compound to a low temp. heat insulating material of water-containing gel consisting of PVA and sodium borate. CONSTITUTION:A low temp. heat insulation material consisting of water-containing gel comprising water, PVA, and sodium borate as main agents is blended with a chelating agent (e.g., ethylenediamine tetraacetate, etc.) to react with an alkaline earth metal ion (e.g., calcium ion, etc.) to form a water-soluble chelate compound in an amount to give an equivalent with alkaline earth metal ion in water, to improve the low temp. heat insulation material. |
