Molded body of latent heat storage material and method for manufacturing the same

Abstract

To provide, in an alloy-based latent-heat heat-storage material, a latent-heat heat-storage material molded body that has no leakage of core particle alloy during high temperature calcination and a high heat-storage density.SOLUTION: Provided is a molded body that comprises (A) a latent-heat heat-storage material in which a core particle made of Al-Si alloy is coated with an aluminum oxide film, and (B) an oxide, and in which, characterized, the oxide (B) contains silicon dioxide by 60 mass% or more . By having a molded body that has said composition, leakage of core particle alloy during high-temperature calcination can be suppressed, and a molded body having high heat-storage density can be obtained.SELECTED DRAWING: None

Claims

1. A molded body comprising a latent heat storage material (A) and an oxide (B), wherein core particles made of an Al-Si alloy, with a volume average particle diameter of 10 μm or more and 100 μm or less, are coated with an aluminum oxide film, The content of the latent heat storage material (A) is 60% by mass or more and 95% by mass or less of the total amount of the molded body, and the content of the oxide (B) is 5% by mass or more and 40% by mass or less of the total amount of the molded body. Only the aforementioned latent heat storage material (A) contains aluminum oxide. The oxide (B) is an inorganic binder, and the molded article is characterized in that it contains 95% by mass or more of silicon dioxide relative to the total amount of oxide (B).

2. The molded article according to claim 1, characterized in that the content of the latent heat storage material (A) is 60% by mass or more and 70% by mass or less of the total amount of the molded article, and the content of the oxide (B) is 30% by mass or more and 40% by mass or less of the total amount of the molded article.

3. The molded body according to claim 1 or 2, characterized in that the molded body is pellet-shaped, spherical, ring-shaped, plate-shaped, rod-shaped, or honeycomb-shaped.

4. A method for manufacturing a molded body consisting of a latent heat storage material (A) and an oxide (B), wherein core particles made of an Al-Si alloy and having a volume average particle diameter of 10 μm or more and 100 μm or less are coated with an aluminum oxide film, (1) A mixing step of mixing the calcination precursor of the latent heat storage material (A) with an inorganic binder containing 90% by mass or more of silicon dioxide; (2) A molding process to form the material into a pellet, spherical, ring, plate, rod, or honeycomb shape; (3) A firing process in which the product is fired at 700°C or higher; The content of the latent heat storage material (A) is 60% by mass or more and 95% by mass or less of the total amount of the molded body, and the content of the oxide (B) is 5% by mass or more and 40% by mass or less of the total amount of the molded body. Only the aforementioned latent heat storage material (A) contains aluminum oxide. A method for manufacturing a molded article, wherein the inorganic binder contains silica derived from silica powder.

5. The method for producing a molded article according to claim 4, characterized in that the content of the latent heat storage material (A) is 60% by mass or more and 70% by mass or less with respect to the total amount of the molded article, and the content of the oxide (B) is 30% by mass or more and 40% by mass or less with respect to the total amount of the molded article.

6. The method for manufacturing a molded article according to claim 5, wherein the mixing step is wet mixing.

7. A method for producing a molded article according to any one of claims 4 to 6, characterized in that an organic binder (C) is further added and mixed in the mixing step.

8. The method for manufacturing a molded article according to any one of claims 4 to 7, characterized in that the latent heat storage material (A) is coated with aluminum oxide using aluminum hydroxide having a boehmite structure.

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