Decorative metal sheet

Abstract

To provide a decorative metal sheet that can easily and inexpensively suppress deterioration in appearance while maintaining weather resistance over a long period of time. [Solution] The surface protective layer 16 is a resin material containing at least one of a polyester resin and an acrylic resin, containing a first hydroxyphenyltriazine-based ultraviolet absorber having a maximum absorption wavelength of 330 nm to 340 nm in a proportion of 2% to 6% by mass, and a second hydroxyphenyltriazine-based ultraviolet absorber having a maximum absorption wavelength of 315 nm to 325 nm in a proportion of 2% to 6% by mass, and having a thickness of 2 μm to 13 μm. The colored layer 14 is a decorative metal plate 10 containing a hydroxyphenyltriazine-based supporting ultraviolet absorber in a proportion of 1.5% to 5% by mass, and an N-OR type hindered amine-based supporting light stabilizer in a proportion of 0.5% to 1.5% by mass.

Claims

1. A base material in the shape of a metal plate, A base layer provided on the surface side of the substrate, A colored layer provided on the surface side of the aforementioned base layer, A pattern layer provided on the surface side of the colored layer, A surface protective layer provided on the surface side of the pattern layer and In a decorative metal sheet having the following features, The surface protective layer comprises a resin material containing at least one of a polyester resin and an acrylic resin, which contains a first hydroxyphenyltriazine-based ultraviolet absorber having a maximum absorption wavelength of 330 nm to 340 nm in a proportion of 2% to 6% by mass, and a second hydroxyphenyltriazine-based ultraviolet absorber having a maximum absorption wavelength of 315 nm to 325 nm in a proportion of 2% to 6% by mass, and has a thickness of 2 μm to 13 μm. The colored layer contains a hydroxyphenyltriazine-based supporting UV absorber in an amount of 1.5% to 5% by mass, and an N-OR type hindered amine-based supporting light stabilizer in an amount of 0.5% to 1.5% by mass. A decorative metal sheet characterized by the following features.

2. The pattern layer contains the support ultraviolet absorber in an amount of 1.5% by mass or more and 5% by mass or less, and the support light stabilizer in an amount of 0.5% by mass or more and 1.5% by mass or less. The decorative metal sheet according to feature 1.

3. The surface protective layer contains a first light stabilizer of the N-OR type hindered amine in a proportion of 1% by mass or more and 3% by mass or less. The decorative metal sheet according to feature 1.

4. The aforementioned surface protective layer is N-CH ３ It contains a second type of hindered amine-based light stabilizer in a proportion of 1% to 3% by mass. The decorative metal plate according to feature 3.

5. The surface protective layer contains a first matte additive having an average particle size of 1 μm to 5 μm. The decorative metal sheet according to feature 1.

6. The surface protective layer contains 0.5 to 5 parts by mass of the first matting additive per 100 parts by mass of the resin material. The decorative metal plate according to feature 5.

7. The first matting additive is at least one of silica and acrylic resin beads. The decorative metal plate according to feature 5.

8. The surface protective layer further contains a second matte-finish additive having an average particle size of more than 5 μm and less than or equal to 10 μm. The decorative metal plate according to feature 5.

9. The surface protective layer contains 10 to 20 parts by mass of the second matting additive per 100 parts by mass of the resin material. The decorative metal plate according to feature 8.

10. The second matte additive is an acrylic resin bead. The decorative metal plate according to feature 8.

11. A back coating layer is provided on the back side of the aforementioned substrate. The decorative metal sheet according to feature 1.

12. A chemical conversion coating layer is provided on the front and back surfaces of the substrate. The decorative metal sheet according to feature 1.

13. The aforementioned substrate is a steel plate with a metal coating formed on both its front and back surfaces. The decorative metal sheet according to feature 1.

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