CN-122029042-A - Multilayer coating film and method for producing same

CN122029042ACN 122029042 ACN122029042 ACN 122029042ACN-122029042-A

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 black pigment, and a transparent coating film which is formed on the glossy coating film, wherein the brightness L * 45 based on the spectral reflectance of light I 45 irradiated from an angle of 45 degrees to the surface of the multilayer coating film at an angle of 45 degrees to regular reflection light is 1 or more and less than 40, and the occupancy of the glossy material as viewed from the normal direction of the multilayer coating film surface is 30% or more and 80% or less, based on the ratio (L * 5/L * 45) of the brightness L * based on the spectral reflectance of light I 45 received at an angle of 5 degrees to regular reflection light to the brightness L * 45 based on the spectral reflectance of light I 45 received at an angle of 45 degrees to regular reflection light is 4.0 or more and 10.0 or less.

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 (9)

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 black pigment, and A transparent coating film formed on the brightening coating film, Wherein a luminance L * 45 based on a spectral reflectance of light I 45 irradiated at an angle of 45 degrees with respect to the surface of the multilayer coating film is 1 or more and less than 40, The ratio (L * 5/L * 45) of the luminance L * 5 based on the spectral reflectance of the light I 45 received at an angle of 5 degrees with respect to the specular reflection light to the luminance L * 45 based on the spectral reflectance of the light I 45 received at an angle of 45 degrees with respect to the specular reflection light is 4.0 or more and 10.0 or less, The occupancy of the bright material as seen from the normal direction of the surface of the multilayer coating film is 30% or more and 80% or less.
2. The multilayer coating film according to claim 1, wherein the feel of particles on the surface of the multilayer coating film is 4.0 or more and 8.0 or less.
3. The multilayer coating film according to claim 1 or 2, wherein a luminance CL x 45 based on a spectral reflectance of the photo IC 45 irradiated at an angle of 45 degrees with respect to the surface of the colored coating film is 0 or more and 45 or less, the light being received at an angle of 45 degrees with respect to the regular reflection light.
4. The multilayer coating film according to any one of claims 1 to 3, wherein the thickness of the glossy coating film is 0.05 μm or more and 1.0 μm or less.
5. The multilayer coating film according to any one of claims 1 to 4, wherein the brightening material comprises aluminum particles.
6. 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 black 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 a luminance L x 45 based on a spectral reflectance of light I 45 irradiated at an angle of 45 degrees with respect to the surface of the multilayer coating film is 1 or more and less than 40, The ratio (L5/L45) of the luminance L5 based on the spectral reflectance of the light I 45 received at an angle of 5 degrees with respect to the specular reflection light 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 specular reflection light is 4.0 or more and 10.0 or less, The occupancy of the bright material as seen from the normal direction of the surface of the multilayer coating film is 30% or more and 80% or less.
7. The method for producing a multilayer coating film according to claim 6, wherein the clear coating material is a two-component type coating material comprising a hydroxyl group-containing resin and a polyisocyanate compound.
8. The method for producing a multilayer coating film according to claim 6 or 7, wherein the solid content concentration of the lustrous pigment dispersion is 0.1 mass% or more and 12.0 mass% or less.
9. The method for producing a multilayer coating film according to any one of claims 6 to 8, 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 purpose of the present invention is to provide a multilayer coating film that has both high brightness variation and metallic tone texture in the gray color domain. 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 black pigment, and A transparent coating film formed on the brightening coating film, Wherein a luminance L x 45 based on a spectral reflectance of light I 45 irradiated at an angle of 45 degrees with respect to the surface of the multilayer coating film is 1 or more and less than 40, The ratio (L5/L45) of the luminance L5 based on the spectral reflectance of the light I 45 received at an angle of 5 degrees with respect to the specular reflection light 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 specular reflection light is 4.0 or more and 10.0 or less, The occupancy of the bright material as seen from the normal direction of the surface of the multilayer coating film is 30% or more and 80% or less. [2] The multilayer coating film of [1], wherein the feel of particles on the surface of the multilayer coating film is 4.0 to 8.0. [3] The multilayer coating film according to [1] or [2], wherein the luminance CL by the spectral reflectance of the light IC 45 irradiated from an angle of 45 degrees to the surface of the colored coating film is not less than 0 and not more than 45, based on the light IC 45 irradiated at an angle of 45 degrees to the regular reflection light. [4] The multilayer coating film according to any one of the above [1] to [3], wherein the thickness of the glossy coating film is 0.05 μm or more and 1.0 μm or less. [5] The multilayer coating film according to any one of the above [1] to [4], wherein the brightening material comprises aluminum particles. [6] 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 black 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 a luminance L x 45 based on a spectral reflectance of light I 45 irradiated at an angle of 45 degrees with respect to the surface of the multilayer coating film is 1 or more and less than 40, The ratio (L5/L45) of the luminance L5 based on the spectral reflectance of the light I 45 received at an angle of 5 degrees with respect to the specular reflection light 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 specular reflection light is 4.0 or more and 10.0 or less, The occupancy of the bright material as seen from the normal direction of the surface of the multilayer coating film is 30% or more and 80% or less. [7] The method for producing a multilayer coating film according to [6], wherein the clear coating material is a two-component type coating material comprising a hydroxyl group-containing resin and a polyisocyanate compound. [8] The method for producing a multilayer coating film according to [6] or [7], wherein the solid content concentration of the lustrous pigment dispersion is 0.1 mass% or more and 12.0 mass% or less. [9] The method for producing a multilayer coating film according to any one of the above [6] to [8], wherein the luster pigment dispersion contains cellulose nanofibers. Effects of the invention According to the present invention, a multilayer coating film having both high brightness change and metallic tone texture in the gray-scale region and a method for producing the same can be provided. Drawings FIG. 1 is a graph illustrating the light receiv