Abstract: A method for producing a vacuum insulation material includes producing a core by molding a core starting material composition, containing a talc-based clay mineral, a potassium compound and an organic solvent, into a predetermined shape to yield a core molded body, and firing the core molded body at a temperature that is lower than the melting point of the talc-based clay mineral. The core is vacuum-packaged with a gas barrier packaging material, to thereby produce a vacuum insulation material.

Abstract: A method for producing a vacuum insulation material includes producing a core by molding a core starting material composition, containing a talc-based clay mineral, a potassium compound and an organic solvent, into a predetermined shape to yield a core molded body, and firing the core molded body at a temperature that is lower than the melting point of the talc-based clay mineral. The core is vacuum-packaged with a gas barrier packaging material, to thereby produce a vacuum insulation material.

Abstract: A vacuum insulation material has excellent thermal insulation even in a high-temperature environment over a long period of time. A core starting material composition is molded into a predetermined shape, the core starting material composition containing a talc-based clay mineral, a potassium compound selected from potassium carbonate and potassium bicarbonate, and water, and the resultant core starting material composition is fired at a temperature lower than a melting point of the talc-based clay mineral, to produce a core material formed of a porous fired body in which a layered structure of the talc-based clay mineral is cleaved and at least a portion of the cleaved structure is partially bonded. This core material is then vacuum packaged in a gas-barrier packaging, to produce the vacuum insulation material.