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Coating color evaluation method

An evaluation method and a coloring technology, which are applied to color measurement devices, color measurement using color charts, color measurement using electric radiation detectors, etc., can solve the problems of complex changes in metallic color painting, difficulty in sorting or evaluation, etc.

Inactive Publication Date: 2014-12-10
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, when the color samples prepared by the manufacturers of each pigment are various, even if the color samples of each pigment are prepared under fixed conditions, the color change when applying the metallic color is of course complicated, and it is difficult to organize or evaluate

Method used

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no. 1 approach

[0058] In the first embodiment of the evaluation method of coloring according to the present invention, the coating film of the above-mentioned photoluminescent paint is produced, the spectral reflectance is measured according to a predetermined light receiving angle, and the L*C*h chromaticity diagram is calculated from the spectral reflectance. The ratio of the brightness L* to the chroma C* is C* / L*. Furthermore, the above-mentioned C* / L* is respectively obtained for a plurality of photoluminescent paints, and the value of the above-mentioned C* / L* is expressed on one coordinate axis (the first coordinate axis), and other parameters are expressed on another one. A graph is drawn by arranging coordinate points representing the coloring of a plurality of photoluminescent paints on a two-dimensional plane represented by a coordinate axis (second coordinate axis). When C* / L* is used as the axis, compared with the case where C* is used as the axis, the spread is closer to the vi...

Embodiment

[0090] Hereinafter, the present invention will be specifically described based on examples.

[0091] (How to make the coated board)

[0092] An intermediate-coated panel on which a coating film of N-6 gray-intermediate paint was formed in advance was prepared, and after solvent degreasing and cleaning, the photoluminescence paint was applied to the coated panel as a cured coating film by air spraying so as to have a thickness of 20 μm. After that, it was left to stand in a laboratory at a room temperature of about 20° C. for 15 minutes, and then, the clear paint was applied on the coated panel as a cured coating film by air spraying so as to have a thickness of 30 μm. After that, it was left to stand in a laboratory at a room temperature of about 20° C. for 15 minutes, and then the clear paint was applied by air spraying as a cured coating film to a thickness of 40 μm on the coated panel. Then, it was left to stand in a laboratory at a room temperature of about 20° C. for 15 ...

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Abstract

An evaluation method of a coating color is a method of evaluating a coating color of a coating material containing a color pigment and an effect pigment, the method including: measuring a spectral reflectance of a coating film of the coating material; and calculating C* / L*, which is a ratio of chroma C* to lightness L* in the L*C*h color space, from the spectral reflectance.

Description

technical field [0001] The present invention relates to a method for evaluating the coloring of paints containing colored pigments and photoluminescent pigments. [0002] This application claims priority based on Japanese Patent Application No. 2012-025028 for which it applied on February 8, 2012, and uses the content here. Background technique [0003] In recent years, paints (for example, metallic paints) containing various photoluminescent pigments (aluminum flakes, mica flakes, graphite, etc.) have been widely used. In the coating film color (hereinafter referred to as "painting" or "metallic color") obtained by applying such a paint to, for example, an automobile exterior panel, the visual effect of the color changes depending on the viewing angle. In contrast, a painting in which the visual effect of the color does not change with the viewing angle is called "monochrome". [0004] Currently, engineers or designers consider the inherent colors of coloring pigments (so...

Claims

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Application Information

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IPC IPC(8): G01J3/46
CPCG01J3/462G01J3/504G01J3/50G01J3/52
Inventor 松下晶子原田修仓持竜生
Owner KANSAI PAINT CO LTD
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