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CN-122029040-A - Multilayer coating film and method for producing same

CN122029040ACN 122029040 ACN122029040 ACN 122029040ACN-122029040-A

Abstract

A multilayer coating film includes a colored coating film that is formed on a substrate and that includes a white pigment and a black pigment, a clear coating film that is formed on the colored coating film and that includes a clear material and a color pigment, and a transparent coating film that is formed on the clear coating film, wherein a chroma C * 45 based on a spectral reflectance of light I 45 irradiated from an angle of 45 degrees with respect to a surface of the multilayer coating film is 10.0 or more and 25.0 or less, and a ratio (L * 5/L * 15) of a luminance L * based on a spectral reflectance of light I 45 received from an angle of 5 degrees with respect to a specular reflection light to a luminance L * based on a spectral reflectance of light I 45 received from an angle of 15 degrees with respect to the specular reflection light is 1.0 or more and 4.0 or less, and an occupancy of the clear material as viewed from a normal direction of the multilayer coating film surface is 20% or more and 80% 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 (8)

  1. 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 containing a glossy material and a color pigment, and A transparent coating film formed on the brightening coating film, Wherein a chroma C * 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 10.0 or more and 25.0 or less, The ratio (L * 5/L * 15) 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 * based on the spectral reflectance of the light I 45 received at an angle of 15 degrees with respect to the specular reflection light is 1.0 or more and 4.0 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 80% or less.
  2. 2. The multilayer coating film according to claim 1, wherein the feel of particles on the surface of the multilayer coating film is 2.0 or more and 6.0 or less.
  3. 3. The multilayer coating film according to claim 1 or 2, wherein the thickness of the glossy coating film is 0.05 μm or more and 1.0 μm or less.
  4. 4. The multilayer coating film according to any one of claims 1 to 3, wherein the brightening material comprises aluminum particles.
  5. 5. 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 color 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 chroma C * 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 10.0 or more and 25.0 or less, The ratio (L * 5/L * 15) 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 * based on the spectral reflectance of the light I 45 received at an angle of 15 degrees with respect to the specular reflection light is 1.0 or more and 4.0 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 80% or less.
  6. 6. The method for producing a multilayer coating film according to claim 5, wherein the clear coating material is a two-component type coating material comprising a hydroxyl group-containing resin and a polyisocyanate compound.
  7. 7. The method for producing a multilayer coating film according to claim 5 or 6, wherein the solid content concentration of the bright pigment dispersion is 0.1 mass% or more and 12.0 mass% or less.
  8. 8. The method for producing a multilayer coating film according to any one of claims 5 to 7, 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 having high brightness variation and high chroma in a highlight region (HIGHLIGHT REGION). 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 containing a glossy material and a color pigment, and A transparent coating film formed on the brightening coating film, Wherein a chroma C * 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 10.0 or more and 25.0 or less, The ratio (L *5/L* 15) 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 * based on the spectral reflectance of the light I 45 received at an angle of 15 degrees with respect to the specular reflection light is 1.0 or more and 4.0 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 80% or less. [2] The multilayer coating film of [1], wherein the feel of particles on the surface of the multilayer coating film is 2.0 to 6.0. [3] The multilayer coating film according to the above [1] or [2], wherein the thickness of the glossy coating film is 0.05 μm or more and 1.0 μm or less. [4] The multilayer coating film according to any one of the above [1] to [3], wherein the brightening material comprises aluminum particles. [5] 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 color 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 chroma C * 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 10.0 or more and 25.0 or less, The ratio (L *5/L* 15) 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 * based on the spectral reflectance of the light I 45 received at an angle of 15 degrees with respect to the specular reflection light is 1.0 or more and 4.0 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 80% or less. [6] The method for producing a multilayer coating film according to [5] above, wherein the clear coating material is a two-component type coating material comprising a hydroxyl group-containing resin and a polyisocyanate compound. [7] The method for producing a multilayer coating film according to [5] or [6], wherein the solid content concentration of the lustrous pigment dispersion is 0.1 mass% or more and 12.0 mass% or less. [8] The method for producing a multilayer coating film according to any one of the above [5] to [7], wherein the luster pigment dispersion contains cellulose nanofibers. Effects of the invention According to the present invention, a multilayer coating film having a high brightness variation and vivid color tone in a high light region in a medium color gamut 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-sec