Coated metal sheet, method for manufacturing same, and exterior building material

Patent metadata

Field	Value
Publication number	US-10174426-B2
Application number	US-201415313714-A
Country	US
Kind code	B2
Filing date	Dec 16, 2014
Priority date	May 29, 2014
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

The coated metal plate pertaining to the present invention is a coated metal plate for exterior use, and has a metal plate and a top coating film disposed on the metal plate. The top coating film contains 0.01-15 vol % of porous particles as a gloss adjusting agent, and the coated metal plate satisfies the expressions below. In the expressions below, R is the number-average particle diameter (μm), D97.5 is the diameter (μm) of 97.5% of the particles, Ru is the upper limit particle diameter (μm), and T is the film thickness (μm) of the top coating film in the number particle size distribution of the gloss adjusting agent. D97.5/T≤0.7; Ru≤1.2T; R≥1.0; 3≤T≤20.

First claim

The invention claimed is:

1. A coated metal sheet comprising a metal sheet and an overcoat coating film to be disposed on the metal sheet,
wherein the overcoat coating film comprises particles having micropores as a gloss adjusting agent,
wherein the content of the gloss adjusting agent in the overcoat coating film is from 0.01 to 15 vol %, and
wherein the coated metal sheet satisfies the following expressions:
D 97.5 /T≤ 0.7
Ru≤ 1.2 T
R≥ 1.0
3≤ T≤ 20

wherein R (μm) is a number average particle diameter of the gloss adjusting agent, T (μm) is a film thickness of the overcoat coating film, D 97.5 (μm) is a 97.5% particle diameter in an accumulated particle size distribution of the gloss adjusting agent based on the number of particles, and Ru (μm) is an upper limit particle diameter in a number particle size distribution of the gloss adjusting agent.

2. The coated metal sheet according to claim 1 , wherein the R is 2.0 or more, and the T is 9 or more and 19 or less.

3. The coated metal sheet according to claim 1 , wherein the Ru is less than T.

4. The coated metal sheet according to claim 1 , wherein the metal sheet has been subjected to non-chromate anti-rust treatment, and the coated metal sheet is chromate-free.

5. The coated metal sheet according to claim 1 , wherein the metal sheet has been subjected to chromate anti-rust treatment.

6. The coated metal sheet according to claim 1 , wherein the gloss adjusting agent is silica particles.

7. The coated metal sheet according to claim 1 , further comprising an undercoat coating film between the metal sheet and the overcoat coating film.

8. The coated metal sheet according to claim 7 , further comprising an intercoat coating film between the undercoat coating film and the overcoat coating film.

9. The coated metal sheet according to claim 1 , having a glossiness at 60° is 20 to 85.

10. The coated metal sheet according to claim 1 , being a coated metal sheet for exterior use.

11. An exterior building material composed of the coated metal sheet according to claim 1 .

12. A method for producing a coated metal sheet comprising a metal sheet and an overcoat coating film to be disposed on the metal sheet, comprising the steps of:
applying an overcoat coating material containing a resin and a gloss adjusting agent onto the metal sheet; and
curing the coating film of the overcoat coating material to form the overcoat coating film;
wherein the content of the gloss adjusting agent in the overcoat coating film is from 0.01 to 15 vol %,
wherein the gloss adjusting agent is particles having micropores, and
wherein the gloss adjusting agent which satisfies the following expressions is employed:
D 97.5 /T≤ 0.7
Ru≤ 1.2 T
R≥ 1.0
3≤ T≤ 20

wherein R (μm) is a number average particle diameter of the gloss adjusting agent, T (μm) is a film thickness of the overcoat coating film, D 97.5 (μm) is a 97.5% particle diameter in an accumulated particle size distribution of the gloss adjusting agent based on the number of particles, and Ru (μm) is an upper limit particle diameter in a number particle size distribution of the gloss adjusting agent.

13. The method for producing a coated metal sheet according to claim 12 , wherein the R is 2.0 or more, and the T is 9 or more and 19 or less.

14. The method for producing a coated metal sheet according to claim 12 , wherein the overcoat coating material has been subjected to treatment for pulverizing the particles in the overcoat coating material.

15. The method for producing a coated metal sheet according to claim 13 , wherein the overcoat coating material has been subjected to treatment for pulverizing the particles in the overcoat coating material.

Assignees

• Nisshin Steel Co Ltd

Inventors

• Hara Taketo
• Ueda Koichiro
• Sakato Kenji
• Takahashi Kazuhiko

Classifications

• B05D1/30

  performed by gravity only, i.e. flow coating · CPC title

• E04F13/12 Primary

  of metal {or with an outer layer of metal or enameled metal (E04F13/0864 takes precedence)} · CPC title

• B05D1/02

  performed by spraying · CPC title

• B05D7/14 Primary

  to metal, e.g. car bodies (involving a chemical reaction between the metal and the coating C23) · CPC title

• E04C2/292

  composed of insulating material and sheet metal · CPC title