Coated metal plate and exterior building material

Patent metadata

Field	Value
Publication number	US-2017100746-A1
Application number	US-201415128260-A
Country	US
Kind code	A1
Filing date	Mar 26, 2014
Priority date	Mar 24, 2014
Publication date	Apr 13, 2017
Grant date	—

Abstract

This coated metal plate is a chromate-free coated metal plate for exterior applications, which comprises a metal plate and a coating film that is arranged on the metal plate. The coating film contains 0.01-15% by volume of porous particles as a gloss control agent. If R (μm) is the number average particle diameter of the gloss control agent, T (μm) is the film thickness of the coating film, and σ is the standard deviation of the number-based particle size distribution of the gloss control agent, the coated metal plate satisfies the following formulae. (R+2σ)/T≦0.7 R≧2.0 9≦T≦19.

First claim

1 .- 4 . (canceled)

5 . A chromate-free coated metal sheet comprising a metal sheet and an overcoat coating film to be disposed on the metal sheet,
wherein the metal sheet is any one selected from the group consisting of cold-rolled steel sheets, galvanized steel sheets, Zn—Al alloy-plated steel sheet, Zn—Al—Mg alloy-plated steel sheets, aluminum-plated steel sheets, stainless steel sheets, and copper sheets, 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 0.01 to 15 vol %, and wherein the coated metal sheet satisfies the following expressions:
( R+ 2σ)/ T≦ 0.7

R≧2.0

9≦T≦19

σ≦0.3 T

wherein R (μm) is the number average particle diameter of the gloss adjusting agent, T (μm) is the film thickness of the overcoat coating film, and σ is the standard deviation of the number particle size distribution of the gloss adjusting agent.

6 . The coated metal sheet according to claim 5 , further comprising an undercoat coating film between the metal sheet and the overcoat coating film.

7 . The coated metal sheet according to claim 5 , wherein the gloss adjusting agent is silica.

8 . The coated metal sheet according to claim 5 , wherein the value L of the overcoat coating film is 70 or less, and the film thickness T of the overcoat coating film is 13 μm or less.

9 . The coated metal sheet according to claim 5 , wherein the value L of the overcoat coating film is more than 80, and the film thickness T of the overcoat coating film is 15 μm or more.

10 . The coated metal sheet according to claim 5 , wherein the absolute value ΔL of the difference between the value L of the overcoat coating film and the value L of the color of the surface of the metal sheet before the overcoat coating film is formed is 10 or less, and the film thickness T of the overcoat coating film is 11 μm or less.

11 . The coated metal sheet according to claim 5 , wherein the absolute value ΔL of the difference between the value L of the overcoat coating film and the value L of the color of the surface of the metal sheet before the overcoat coating film is formed is 20 or less, and the film thickness T of the overcoat coating film is 13 μm or less.

12 . The coated metal sheet according to claim 5 , wherein the absolute value ΔL of the difference between the value L of the overcoat coating film and the value L of the color of the surface of the metal sheet before the overcoat coating film is formed is 50 or less, and the film thickness T of the overcoat coating film is 15 μm or less.

13 . The coated metal sheet according to claim 5 , having a glossiness at 60° of 20 to 85.

14 . The coated metal sheet according to claim 5 , wherein the coated metal sheet is a coated metal sheet for exterior.

15 . An exterior building material composed of the coated metal sheet according to claim 5 .

16 . The exterior building material according to claim 15 , further comprising one or more selected from the group consisting of members to fix the exterior building material to a building, members to connect the exterior building material(s) to one another, marks that show the direction of the exterior building material on mounting, and foam sheets or foam layers to improve thermal insulation properties.

17 . A chromate-free coated metal sheet comprising a metal sheet and an overcoat coating film to be disposed on the metal sheet,
wherein the metal sheet is any one selected from the group consisting of cold-rolled steel sheets, galvanized steel sheets, Zn—Al alloy-plated steel sheet, Zn—Al—Mg alloy-plated steel sheets, aluminum-plated steel sheets, stainless steel sheets, and copper sheets, 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 0.01 to 15 vol %, and wherein the coated metal sheet satisfies the following expressions:
R≧2.0

9≦T≦19

wherein R (μm) is the number average particle diameter of the gloss adjusting agent and T (μm) is the film thickness of the overcoat coating film, and the maximum value of the particle diameter in the number particle size distribution of the gloss adjusting agent is 0.7 T or less.

18 . The coated metal sheet according to claim 17 , wherein the maximum value of the particle diameter in the number particle size distribution of the gloss adjusting agent is 0.6 T or less.

19 . The coated metal sheet according to claim 17 , further comprising an undercoat coating film between the metal sheet and the overcoat coating film.

20 . The coated metal sheet according to claim 17 , wherein the gloss adjusting agent is silica.

21 . The coated metal sheet according to claim 17 , wherein the value L of the overcoat coating film is 70 or less, and the film thickness T of the overcoat coating film is 13 μm or less.

22 . The coated metal sheet according to claim 17 , wherein the value L of the overcoat coating film is more than 80, and the film thickness T of the overcoat coating film is 15 μm or more.

23 . The coated metal sheet according to claim 17 , wherein the absolute value ΔL of the difference between the value L of the overcoat coating film and the value L of the color of the surface of the metal sheet before the overcoat coating film is formed is 10 or less, and the film thickness T of the overcoat coating film is 11 μm or less.

24 . The coated metal sheet according to claim 17 , wherein the absolute value ΔL of the difference between the value L of the overcoat coating film and the value L of the color of the surface of the metal sheet before the overcoat coating film is formed is 20 or less, and the film thickness T of the overcoat coating film is 13 μm or less.

25 . The coated metal sheet according to claim 17 , wherein the absolute value ΔL of the difference between the value L of the overcoat coating film and the value L of the color of the surface of the metal sheet before the overcoat coating film is formed is 50 or less, and the film thickness T of the overcoat coating film is 15 μm or less.

26 . The coated metal sheet according to claim 17 , having a glossiness at 60° of 20 to 85.

27 . The coated metal sheet according to claim 17 , wherein the coated metal sheet is a coated metal sheet for exterior.

28 . An exterior building material composed of the coated metal sheet according to claim 17 .

29 . The exterior building material according to claim 28 , further comprising one or more selected from the group consisting of members to fix the exterior building material to a building, members to connect the exterior building material(s) to one another, marks that show the direction of the exterior building material on mounting, and foam sheets or foam layers to improve thermal insulation properties.

Assignees

• Nisshin Steel Co Ltd

Inventors

• Hara Taketo
• Yano Hirokazu
• Sakato Kenji
• Takahashi Kazuhiko

Classifications

• B05D3/002

  Pretreatement · CPC title

• B05D3/0254

  After-treatment · CPC title

• E04B2002/0286

  Building elements with coatings · CPC title

• E04B1/7675

  Insulating linings for the interior face of exterior walls · CPC title

• B05D7/53

  Base coat plus clear coat type · CPC title