Metal gloss design member
View Patent ↗To provide a metal gloss design member provided with a light reflection film such as a silver thin film having satisfactory weather resistance even in outdoor use. A silver coating film 10 provided at least with a silver thin film 14 and with a topcoat layer 16 formed on the outer side in the stacking direction relative to the silver thin film 14 is formed on a substrate 3 and then the topcoat layer 16 has ultraviolet absorbability.
1. A metal gloss design member comprising:
a substrate used for a cowl or a fuel tank in a motorcycle;
an undercoat layer disposed on an outer side in a stacking direction and directly on the substrate;
a silver thin film disposed on the outer side in the stacking direction and directly on the undercoat layer without interposing an adhesive layer adhering by thermal melting; and
a topcoat layer disposed on the outer side in the stacking direction relative to the silver thin film and having ultraviolet absorbability,
wherein the undercoat layer is made of a two-component curable resin, and
wherein the silver thin film functions as a two-way mirror with visible light reflectivity and visible light transmissivity by having a thickness of more than 0.05 μm and less than 0.1 μm and shows silver metal gloss.
2. The metal gloss design member according to claim 1 , wherein the undercoat layer is made of a two-component polyurethane resin obtained by mixing a base resin and a curing agent.
3. The metal gloss design member according to claim 1 , wherein the topcoat layer is made of a two-component curable resin.
4. The metal gloss design member according to claim 1 , wherein the top coat layer is disposed directly on the silver thin film.
5. The metal gloss design member according to claim 1 , wherein an intermediate coat layer is disposed on the outer side in the stacking direction and on the silver thin film, and
wherein the top coat layer is disposed directly on the intermediate coat layer.
6. The metal gloss design member according to claim 1 , wherein a thickness of the undercoat layer is 5 μm or greater and 30 μm or smaller.
7. A method for manufacturing a metal gloss design member, comprising:
a first step of curing and forming an undercoat layer on an outer side in a stacking direction and directly on a substrate used for a cowl or a fuel tank in a motorcycle;
a second step of forming a silver thin film on the outer side in the stacking direction directly on the undercoat layer cured in the first step without interposing an adhesive layer adhering by thermal melting; and
a third step of forming a topcoat layer having ultraviolet absorptivity on the outer side in the stacking direction relative to the silver thin film formed in the second step,
wherein in the first step, the undercoat layer is cured and formed by mixing a main resin and a curing agent for curing the main resin, and
wherein the silver thin film formed in the second step functions as a two-way mirror with visible light reflectivity and visible light transmissivity by having a thickness of more than 0.05 μm and less than 0.1 μm and shows silver metal gloss.
8. The method according to claim 7 , wherein in the first step, a resin composition cured and formed by mixing the main resin and the curing agent is dissolved in an organic solvent and coated onto the substrate.