CN-122029049-A - Multilayer coating film and method for producing same
Abstract
A multilayer coating film comprising a colored coating film which is formed on a substrate and contains a white pigment and a black pigment, a glossy coating film which is formed on the colored coating film and contains a glossy material and a white pigment, and a transparent coating film which is formed on the glossy coating film, wherein the luminance L5 of the spectral reflectance based on light I 45 irradiated from an angle of 45 degrees to the surface of the multilayer coating film at an angle of 5 degrees to regular reflection light is 100 to 170, the ratio (L5/L45) of the luminance L5 to the luminance L * based on the spectral reflectance based on light I 45 received at an angle of 15 degrees to regular reflection light is 1.0 to 3.0, the occupancy of the material as viewed from the normal direction of the multilayer coating film surface is 20% to 60%, and the graininess of the multilayer coating film is 2.0 to 5.0.
Inventors
- Maru Wang Jianzhi
- Kazuki Tsujiwara
- TANAKA GEN
Assignees
- 日涂汽车涂料有限公司
Dates
- Publication Date
- 20260512
- Application Date
- 20241107
- Priority Date
- 20231110
Claims (7)
- 1. A multilayer coating film comprising: a colored coating film which is formed on a substrate and contains a white pigment and a black pigment; a bright coating film formed on the colored coating film and containing a bright material and a white pigment, and A transparent coating film formed on the brightening coating film, Wherein the luminance L.times.5 based on the spectral reflectance of light I 45 irradiated at an angle of 5 degrees relative to the specular reflection light from the surface of the multilayer coating film from an angle of 45 degrees is 100 or more and 170 or less, The ratio (L5/L45) of the luminance L5 to the luminance L45 based on the spectral reflectance of the light I 45 received at an angle of 45 degrees with respect to the regular reflection light is 1.0 or more and 3.0 or less, The occupancy of the bright material as seen from the normal direction of the surface of the multilayer coating film is 20% or more and 60% or less, The multilayered coating film has a graininess of 2.0 to 5.0.
- 2. The multilayer coating film according to claim 1, wherein the thickness of the glossy coating film is 0.05 μm or more and 1.0 μm or less.
- 3. The multilayer coating film according to claim 1 or 2, wherein the brightening material comprises aluminum particles.
- 4. A method for producing a multilayer coating film, comprising: Applying a colored coating material containing a white pigment and a black pigment on the object to be coated to form an uncured colored coating film; Coating a lustrous pigment dispersion comprising a lustrous material and a white pigment on the uncured colored coating film to form an uncured lustrous coating film; Applying a clear coating on the uncured clear coating film to form an uncured clear coating film, and Curing the uncured colored coating film, the uncured clear coating film and the uncured clear coating film to obtain a multilayer coating film, Wherein the luminance L.times.5 based on the spectral reflectance of light I 45 irradiated at an angle of 5 degrees relative to the specular reflection light from the surface of the multilayer coating film from an angle of 45 degrees is 100 or more and 170 or less, The ratio (L5/L45) of the luminance L5 to the luminance L45 based on the spectral reflectance of the light I 45 received at an angle of 45 degrees with respect to the regular reflection light is 1.0 or more and 3.0 or less, The occupancy of the bright material as seen from the normal direction of the surface of the multilayer coating film is 20% or more and 60% or less, The multilayered coating film has a graininess of 2.0 to 5.0.
- 5. The method for producing a multilayer coating film according to claim 4, wherein the clear coating material is a two-component type coating material comprising a hydroxyl group-containing resin and a polyisocyanate compound.
- 6. The method for producing a multilayer coating film according to claim 4 or 5, wherein the solid content concentration of the lustrous pigment dispersion is 0.1 mass% or more and 12.0 mass% or less.
- 7. The method for producing a multilayer coating film according to any one of claims 4 to 6, wherein the lustrous pigment dispersion contains cellulose nanofibers.
Description
Multilayer coating film and method for producing same Technical Field The present invention relates to a multilayer coating film and a method for producing the same. Background In recent years, with the progress of technology, multilayer coating films having various colors and textures for automobiles have been proposed. Among them, a coating film having a metallic texture is attracting attention. Patent document 1 discloses a method for forming a multilayer coating film using 2 kinds of luminescent pigments. Prior art literature Patent literature Patent document 1 Japanese patent publication No. 6788315. Disclosure of Invention Problems to be solved by the invention The appearance required for the multilayer coating film also shows a tendency to be diversified due to diversification of consumer preference and pursuit of originality. The purpose of the present invention is to provide a multilayer coating film which can exhibit a bright and stable metallic tone appearance. Means for solving the problems In order to solve the above problems, the present invention provides the following means. [1] A multilayer coating film comprising: a colored coating film which is formed on a substrate and contains a white pigment and a black pigment; A glossy coating film formed on the colored coating film and comprising a glossy material and a white pigment; A transparent coating film formed on the brightening coating film, Wherein the luminance L.times.5 based on the spectral reflectance of light I 45 irradiated at an angle of 5 degrees relative to the specular reflection light from the surface of the multilayer coating film from an angle of 45 degrees is 100 or more and 170 or less, The ratio (L5/L45) of the luminance L5 to the luminance L45 based on the spectral reflectance of the light I 45 received at an angle of 45 degrees with respect to the regular reflection light is 1.0 or more and 3.0 or less, The occupancy of the bright material as seen from the normal direction of the surface of the multilayer coating film is 20% or more and 60% or less, The multilayered coating film has a graininess of 2.0 to 5.0. [2] The multilayer coating film according to [1], wherein the thickness of the glossy coating film is 0.05 μm or more and 1.0 μm or less. [3] The multilayer coating film of [1] or [2], wherein the brightening material comprises aluminum particles. [4] A method for producing a multilayer coating film, comprising: Applying a colored coating material containing a white pigment and a black pigment on the object to be coated to form an uncured colored coating film; Coating a lustrous pigment dispersion comprising a lustrous material and a white pigment on the uncured colored coating film to form an uncured lustrous coating film; Applying a clear coating on the uncured clear coating film to form an uncured clear coating film, and Curing the uncured colored coating film, the uncured clear coating film and the uncured clear coating film to obtain a multilayer coating film, Wherein the luminance L.times.5 based on the spectral reflectance of light I 45 irradiated at an angle of 5 degrees relative to the specular reflection light from the surface of the multilayer coating film from an angle of 45 degrees is 100 or more and 170 or less, The ratio (L5/L45) of the luminance L5 to the luminance L45 based on the spectral reflectance of the light I 45 received at an angle of 45 degrees with respect to the regular reflection light is 1.0 or more and 3.0 or less, The occupancy of the bright material as seen from the normal direction of the surface of the multilayer coating film is 20% or more and 60% or less, The multilayered coating film has a graininess of 2.0 to 5.0. [5] The method for producing a multilayer coating film according to [4], wherein the clear coating material is a two-component type coating material comprising a hydroxyl group-containing resin and a polyisocyanate compound. [6] The method for producing a multilayer coating film according to [4] or [5], wherein the solid content concentration of the lustrous pigment dispersion is 0.1 mass% or more and 12.0 mass% or less. [7] The method for producing a multilayer coating film according to any one of the above [4] to [6], wherein the luster pigment dispersion contains cellulose nanofibers. Effects of the invention According to the present invention, a multilayer coating film capable of exhibiting a bright and stable metallic tone appearance can be provided. Drawings FIG. 1 is a graph illustrating the light receiving angle of spectral reflectance. Fig. 2 is a cross-sectional view schematically showing a multilayer coating film according to an embodiment of the present invention. FIG. 3 is a cross-sectional view schematically showing a glossy coating film according to an embodiment of the present invention. FIG. 4 is a flowchart showing a method for producing a multilayer coating film according to an embodiment of the present invention. Detailed Description A. multilayer