Pre-painted metal sheet, burn-prevention cover, and manufacturing method of pre-painted metal sheet
AssigneeNippon Steel Corporation
InventorFumio Shibao
Life of this patent
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Abstract
A pre-painted metal sheet including a metal sheet and a void-containing paint film, which is located on at least one surface of the metal sheet, with dispersed fine particles and voids, wherein when a cross-section of the void-containing paint film cut in a thickness direction of the void-containing paint film is observed, the voids are present in 40 to 95 area % of a total area of the cross-section of the void-containing paint film. When an average particle diameter of the fine particles is t [μm] and an average film thickness of the void-containing paint film is T [μm], a ratio t/T is in a range of 0.7 to 3.0. An elastic modulus of the fine particles, when compressed by 10% from the thickness direction, is 30 MPa or more.
Claims18
A pre-painted metal sheet comprising:
- a metal sheet;
- and
- a void-containing paint film, which is a paint film located on at least one surface of the metal sheet, with dispersed fine particles and voids, wherein
- when a cross-section of the void-containing paint film cut in a thickness direction of the void-containing paint film is observed, the voids are present in 40 to 95 area % of a total area of the cross-section of the void-containing paint film,
- when an average particle diameter of the fine particles is t [μm] and an average film thickness of the void-containing paint film is T [μm], a ratio t/T is in a range of 0.7 to 3.0, and
- an elastic modulus of the fine particles at a 10% compression from the thickness direction of the void-containing paint film is 30 MPa or more.
A manufacturing method of a pre-painted metal sheet having a void-containing paint film, which is a paint film with dispersed fine particles and voids, on at least one surface of a metal sheet, the manufacturing method comprising:
- forming the void-containing paint film by drying and curing a first paint, the curing including coating the first paint, which contains the fine particles, a resin, a curing agent, hollow microcapsules, and a solvent, on at least one surface of the metal sheet and heating the metal sheet coated with the first paint, wherein
- the hollow microcapsules contain an organic solvent and a content of the hollow microcapsules in the first paint is in a range of 5 to 50 mass % of a solid content mass of the first paint, and
- when an average particle diameter of the fine particles is t [μm] and an average film thickness of the void-containing paint film after drying and curing is T [μm], the first paint is coated so that a ratio t/T is in a range of 0.7 to 3.0.
Dependencies are inferred from the claim text.