JP2005028359A - Method for judging the color tone of a coating film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for easily determining the color tone of a coating film. <P>SOLUTION: This method for determining the color tone of the coating film is characterized in that a coating film containing a luster pigment is irradiated with a light beam with a correlated color temperature of 5,000 K or less using a light irradiation device equipped with a ceramic metal halide lamp for radiating the light beam with the correlated color temperature of 5,000 K or less. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for determining the color tone of a coating film provided on an automobile body or the like.

In general, for the evaluation of the color tone of a coating film, an artificial solar light having a light source that emits light having a correlated color temperature of 6500K to 6800K or a lamp having a spectral distribution equivalent to sunlight is used as irradiation light ( Patent Document 1).
In recent years, glitter coatings from paints containing glitter pigments, such as metallic paints and pearl paints, have been used favorably for outer panels of automobiles and the like. Evaluation of the color tone of such glittering coatings includes evaluation of the denseness and flip-flop properties of glittering pigments, and requires skill or use of special measuring instruments or arithmetic expressions. Therefore, a simple evaluation method has been desired. Especially in the automotive repair coating industry, when the repair coating is a glitter coating, it is not easy to obtain the same finished appearance in the repair coating and the normal coating. The colorimetric work for comparing the repair coating and the sample plate requires accuracy.
JP 2000-40406 A

  An object of the present invention is to provide a novel method for determining the color tone of a coating film.

The inventors have found that a light beam emitted from a lamp having a specific color temperature is suitable as a light beam for evaluating the color tone of a coating film, and have reached the present invention.
That is, the present invention
1. The color tone of the coating film is characterized by irradiating the coating film with a light beam having a correlated color temperature of 5000 K or less by using a light irradiation device including a lamp that emits a light beam having a correlated color temperature of 5000 K or less. how to,
2. The method for determining the color tone of the coating film according to item 1, wherein the coating film contains a luster pigment as part of its components,
3. 3. The method for determining the color tone of the coating film according to item 1 or 2, wherein the lamp is a ceramic metal halide lamp, and The method for determining the color tone of the coating film according to any one of items 1 to 3, wherein the coating film is an automobile repair coating film,
About.

  According to the method of the present invention, by irradiating a light beam having a correlated color temperature of 5000 K or less when determining the color tone of the coating film, the orientation of the bright pigment of the coating film containing the bright pigment that has been difficult to determine conventionally It is possible to easily visually recognize the property, the denseness, the flip-flop property, and the like. In addition, when the method of the present invention is applied to a repair coating application such as an automobile coating film, a colorimetric operation for comparing the repair coating film portion and the sample plate can be accurately performed. There is an advantage that the work of adjusting to the same appearance as the part becomes easy.

In the method of the present invention, the color tone of the coating film is determined by the light irradiation apparatus including a lamp that emits a light beam having a correlated color temperature of 5000 K or less, preferably 3000 to 4900 K, more preferably 3600 to 4500 K. It is characterized by irradiating.

In the present invention, the color tone of the coating film means the overall finish of the appearance of the coating film formed by paints, inks, cosmetics, etc., in addition to the color, gloss, transparency, orientation of the pigment, It can be confirmed mainly by visual observation, including the denseness of the pigment, flip-flop properties (glittering), pearly luster, jetness and the like.
The color temperature is a kind of index that generally represents the chromaticity of the emitted light. Generally, the light having a higher color temperature tends to be blue, and the light having a lower color temperature tends to be red. The color temperature is expressed by the temperature (K) of an ideal body called a black body. When the color of the light beam is not on the black body locus which is the color locus and the color locus on the chromaticity diagram, the color temperature of the light beam can be approximately expressed as a correlated color temperature. That is, the correlated color temperature is the temperature of the closest black body that does not match completely when the color of the light ray is not on the black body locus. In the present invention, when the correlated color temperature exceeds 5000K, in the coating color tone evaluation, for example, a unique color development such as a metallic feeling or a pearly feeling (pearly luster feeling) of the coating film containing the glitter pigment can be captured. Since it may not be possible, it is not preferable.

The correlated color temperature in the present invention is determined by the color temperature measuring device when the color temperature of the emitted light becomes substantially constant after, for example, about 3 minutes from turning on the light irradiation device. Means the measured value.
Examples of the coating surface to which the method of the present invention is applied include coating surfaces with paints, inks, and cosmetics, and are not particularly limited. Examples include enamel paints such as paints, pearl paints and solid color paints; and paint film surfaces such as clear paints. Moreover, the multilayer coating film by 2 or more types of coating materials chosen from these top coating materials can also be included. Moreover, you may provide a conventionally well-known putty layer and primer layer in the lower layer of the coating film by the said top coat.

  In the method of the present invention, even when the coating surface contains a glitter pigment as a part of its components, the effect can be sufficiently exhibited. Examples of the glitter pigment include aluminum pigment, glitter mica pigment obtained by thinly coating the surface of mica powder with metal oxide such as titanium oxide and iron oxide, copper powder, gold powder, brass powder and the like. In the method of the present invention, the coating color tone evaluation including the denseness of the glitter pigment and the flip-flop property can be accurately performed by irradiating the light beam having the correlated color temperature in the above range.

The method of the present invention is a method for evaluating the color tone of a coating film or the like provided on an automobile body or the like, and is suitably applied to the color tone evaluation of a repair coating film. For example, the method of the present invention is suitable for a colorimetric operation in which a repair coating portion is compared with a color sample card or a normal portion in a coating film repairing process provided on an automobile body or the like.
As a light irradiation device for irradiating a light beam having a correlated color temperature of 5000 K or less, which is used in the method of the present invention, any device having a lamp that emits a light beam having a correlated color temperature of 5000 K or less is conventionally known. Can be used without restriction.

  As the lamp, any conventionally known lamp can be used as long as the correlated color temperature is within the above range. For example, a metal halide lamp, a ceramic metal halide lamp, a halogen lamp, a xenon lamp, a krypton lamp, a fluorescent lamp, a semiconductor laser, and the like. -, A light emitting diode, and the like. Among these, a ceramic metal halide lamp in which the material of the arc tube is ceramic is preferable.

As a ceramic metal halide lamp suitable for the method of the present invention, for example, it is desirable to have a structure having a double tube structure in which an outer tube is covered so as to cover a luminous tube in which a luminescent material is sealed. It is desirable that nitrogen gas is sealed and sealed in the space.
In this way, the ceramic metal halide lamp has a double tube structure, and by using ceramic as the arc tube, the luminescent material in the arc tube can be prevented from escaping to the outside. This is because the correlated color temperature can be prevented from changing, and the arc tube is covered with an outer tube, thereby improving the heat retention of the arc tube and keeping the temperature of the luminescent gas in the arc tube constant during lighting. It is preferable that the correlated color temperature of the light emitted from the lamp does not change during lighting.

As a result, there is an effect that it is possible to determine a luminescent substance that satisfies the three conditions of correlated color temperature, 365 nm ultraviolet light intensity, and 800 nm infrared light intensity, which are suitable for coating film color determination.
In the ceramic metal halide lamp, a fused quartz glass can be used as a material for the outer tube for satisfactorily transmitting the ultraviolet rays emitted from the arc tube. The fused silica glass is preferably made of a material that transmits ultraviolet light having a wavelength of 365 nm or less. Specifically, it has a transmittance of 50% to 70%, preferably 50 to 60% for 180 nm light, 80 to 90% for 220 nm light, preferably 80 to 85%, and 90% for 300 nm light. % Or more, preferably 90 to 95% of the characteristic fused silica glass. By using an outer tube made of fused silica glass having such characteristics, it is possible to easily determine the color tone even in the colorimetric operation of the glitter coating film.

  In this specification, the light transmittance with respect to fused silica glass is calculated using a spectroscopic measurement method. Using a standard light source whose spectral distribution is known in advance, the fused silica glass is irradiated with light emitted from the light source, and the spectral distribution of the light transmitted through the glass is measured. Next, the spectral distribution of the light transmitted through the glass is calculated as the light transmittance by comparing with the spectral distribution of the standard light source.

Specifically, for example, mercury, which is a luminescent substance that mainly emits ultraviolet rays, and sodium, which is a luminescent substance that mainly emits infrared rays, can be selected as the luminescent substance. Further, dysprosium and cerium may be added to the light-emitting substance. Thereby, light with good color rendering properties can be emitted, and the color tone of the coating film can be accurately determined.
In the method of the present invention, the light emitted from the lamp has a light intensity of 5 mW / cm ² or less at a wavelength of 365 nm and an irradiation distance of 20 cm, and 80
It is desirable that the light intensity at an irradiation distance of 10 cm is within a range of 250 mW / cm ² or less at a wavelength of 0 nm. The illuminance is preferably in the range of 2000 to 5000 lx, preferably 2500 to 4500 lx.

  The light intensity is obtained by measuring the center of the light beam emitted from the lamp with the light meter at the predetermined distance. Examples of the light meter that can be used for measuring the light intensity at a wavelength of 365 nm include “UNIMETER UIT-150 TYPE UIT-150A” (trade name, manufactured by USHIO INC.), And the light amount that can be used for measuring the light intensity at a wavelength of 800 nm. Examples of the total include “MODEL I400A” (trade name, manufactured by INTERNIONAL LIGHT INC.). The illuminance is a value obtained by measuring the center of the emitted light with “MINOLTA T-10” (trade name, manufactured by Minolta, Inc., illuminometer) at an irradiation distance of 1 m from the lamp to the irradiated object.

In the method of the present invention, it is desirable to irradiate a light beam through a filter when irradiating the coating film with a light beam having a correlated color temperature of 5000 K or less. By passing through the filter, scattering of the irradiated light can be suppressed, the illuminance to the irradiated object can be made uniform, and the color tone of the coating film can be evaluated more accurately.
As the filter, for example, a small amount of iron, nickel, cobalt,
Heat-absorbing plate glass colored by adding metal such as selenium, heat-reflecting plate glass coated with a highly reflective metal oxide film on the surface of float plate glass, sand as an abrasive was sprayed on the glass surface with compressed air Frosted glass can be used.

  Examples of the method for determining the color tone of the coating film surface in the presence of a light beam having a correlated color temperature of 5000 K or less include a visual method and a method using a measuring instrument. The irradiation distance from the lamp to the coating film surface is desirably 10 cm or more, preferably about 30 to 200 cm, and can be appropriately adjusted according to the type of coating film.

Hereinafter, the present invention will be described in detail with reference to examples.
FIG. 1 is a schematic side view showing an example of a light irradiation apparatus used in the present invention.
FIG. 2 is a schematic view showing an example of a lamp provided in the light irradiation apparatus used in the present invention.
1, the light irradiation device 1 has a structure in which an irradiator 5 having a lamp 2, a mirror 3 and a lens 4 is mounted on a movable support column 6 so as to be movable up and down. Lamp 2 is a correlated color temperature 4300K, the light intensity in the irradiation distance 20cm in 365nm wavelength is about 3 mW / cm ^2, still at a wavelength of 800 nm, the light intensity in the irradiation distance 10cm is, 150 mW / cm ² of about This is a ceramic metal halide lamp that emits a light beam. The glass filter 7 subjected to double-side frosting is attached to the front surface of the lens 4 and is detachable, and can be installed so as to cover the light emitting surface from the irradiator 5.

In FIG. 2, the lamp 2 has a double tube structure in which an outer tube 22 is covered so as to cover the arc tube 21. The arc tube 21 is made of ceramic, and a predetermined luminescent substance such as mercury or sodium is enclosed in the arc tube 21, and sealing tubes are formed at both ends following the arc tube 21.
The outer tube 22 is made of fused silica glass, is formed so as to cover the arc tube 21, a seal portion 23 is formed at one end of the outer tube 22, and the arc tube 21 is disposed in a sealed state in the outer tube 22. Has been. Further, the space between the outer tube 22 and the arc tube 21 is filled with nitrogen.

The fused silica glass has a transmittance of 55% at a light beam of 180 nm, a transmittance of 83% at a light beam of 220 nm, and a transmittance of 93% at a light beam of 300 nm.
From the sealing tube that follows the arc tube 22, an external lead rod that protrudes to the outside is connected to the internal lead 24 in the outer tube 22.
Further, a ceramic base 25 is fixed to the seal portion 23 of the outer tube 22 by an adhesive, and a power supply pin 26 electrically connected to the internal lead 24 is provided on the base 25.

Example 1
As the test coating plate, each colored coating plate shown in Table 1 was prepared (the coating colors were four colors of blue color chip, silver metallic, 3-coat pearl, and blue solid). Next, for each test coating plate, a color sample corresponding to each coating color is arranged in the vicinity of each test coating plate, and each test coating plate and each corresponding color sample are irradiated with a light irradiation apparatus equipped with the lamp at an irradiation distance of 100 cm. Irradiation was performed, and the color tone of the coating film was evaluated.

Examples 2-3 and Comparative Examples 1-3
In Example 1, the color tone of each test coated plate was determined in the same manner as in Example 1 except that the irradiation conditions were as described in Table 1 below. The results are also shown in Table 1.

(Note 1) Blue color chip: 638 deep blue of “Letan PG Hybrid Color Guide” (trade name, color primary color guide book by Kansai Paint Co., Ltd.).
(Note 2) Silver metallic: Silver metallic coating ("Letane PG Hybrid III metallic white", manufactured by Kansai Paint Co., Ltd., trade name, coating with aluminum pigment-containing coating) and clear coating ("Letane PG Multi Clear Hx (Q) base) "(Trade name, manufactured by Kansai Paint Co., Ltd.) 100 parts by weight," Letane PG Multiclear Hx Standard Curing Agent "(trade name, manufactured by Kansai Paint Co., Ltd.) 50 parts by weight and" PG Hybrid Thinner 20 "(trade name, Kansai Paint Co., Ltd.) (Manufactured) A multilayer coating film in which 20 parts by weight of a clear coating film mixed immediately before use is sequentially formed.

  (Note 3) 3-Coated Pearl: Colored base paint film (“Letane PG Hybrid White”, trade name, paint film made by Kansai Paint Co., Ltd.), Pearl paint film (“Letane PG217L Pearl Liquid White”, product Name, manufactured by Kansai Paint Co., Ltd., paint film with mica pigment-containing paint), clear coating film ("Retan PG Multi Clear Hx (Q) Base" (trade name, manufactured by Kansai Paint Co., Ltd.) 100 parts by weight, "Retan PG Multi Clear Hx" Sequentially formed 50 parts by weight of “standard curing agent” (trade name, manufactured by Kansai Paint Co., Ltd.) and 20 parts by weight of “PG Hybrid Thinner 20” (trade name, manufactured by Kansai Paint Co., Ltd.) with a clear paint mixed immediately before use. A multi-layer coating film.

(Note 4) Blue solid: Blue-based colored base coating ("Letan PG Hybrid G38 Deep Blue", trade name, manufactured by Kansai Paint Co., Ltd.) 100 parts by weight of “Hx (Q) base” (trade name, manufactured by Kansai Paint), 50 parts by weight of “Letane PG Multiclear Hx Standard Curing Agent” (trade name, manufactured by Kansai Paint) and “PG Hybrid Thinner 20” (product) (Name, manufactured by Kansai Paint Co., Ltd.) A multilayer coating film formed by sequentially forming a coating film (clear coating mixed with 20 parts by weight immediately before use).
Evaluation item (* 1) Color evaluation: As a blue solid color swatch, paint color number Toyota 082 of “ABI II” (trade name, color swatch, manufactured by Kansai Paint Co., Ltd.) is used, and the color (reddish blue) The blue color chip was visually compared with the color sample.

○: The difference in color between the blue color chip and the color swatch is easy to understand and easy to evaluate visually. ×: The difference in color between the blue color chip and the color swatch is difficult to understand, and the visual evaluation is difficult.
(* 2) Aluminum orientation: Using the paint color number Toyota 199 of “ABI II” (trade name, color sample, manufactured by Kansai Paint Co., Ltd.) as a color sample of silver metallic, the above-mentioned silver metallic test for the size and orientation of aluminum pigment The coated plate and the color sample were compared visually.

◎: About the size and orientation of the aluminum pigment, the difference between the test coating plate and the color sample is very easy to understand, and visual evaluation is very easy. ○: About the size and direction of the aluminum pigment, there is a difference between the test coating plate and the color sample. Easy to understand and easy to visually evaluate. ○ △: The size and orientation of the aluminum pigment can be confirmed by the difference between the test coating plate and the color sample, and visual evaluation is possible. △: About the size and orientation of the aluminum pigment. The difference between the coated plate and the color sample is difficult to understand, and the visual evaluation is slightly difficult. X: Regarding the size and orientation of the aluminum pigment, a difference between the coated plate and the color sample cannot be visually evaluated.

(* 3) Pearl feeling: Uses paint color number Toyota 051 of “ABI II” (trade name, color swatch, manufactured by Kansai Paint Co., Ltd.) as a color swatch for 3-coat pearl, and changes in the size and direction of light irradiation of pearl pigment With respect to the change in color due to, the test coat plate of 3 coat pearl and the color sample were compared visually.
A: The change in color due to the change in the size of the pearl pigment and the direction of light irradiation is very easy to see the difference between the test coating plate and the color sample, and the visual evaluation is very easy. ○: The size of the pearl pigment and the direction of light irradiation Regarding the change in color due to the change in color, the difference between the test coating plate and the color sample is easy to understand and easy to visually evaluate. ○ △: About the change in color due to the change in the size of the pearl pigment and the direction of light irradiation Differences can be confirmed with the color swatches, and visual evaluation is possible. △: Regarding the change in color due to changes in the size of the pearl pigment and the direction of light irradiation, it is difficult to see the difference between the test coating plate and the color swatches. Slightly difficult, x: Regarding the change in color due to the change in the size of the pearl pigment and the light irradiation direction, the difference between the test coating plate and the color sample cannot be determined by visual evaluation.

(* 4) Transparency: Blue solid color sample “ABI II” (trade name, color sample, manufactured by Kansai Paint Co., Ltd.) is used as paint color number Toyota 082. The color sample was visually compared.
A: Regarding transparency, the difference between the test coated plate and the color sample is very easy to understand, and visual evaluation is very easy. ○: Regarding transparency, the difference between the test coating plate and the color sample is easy to understand, and visual evaluation is easy. Δ: Regarding transparency, the difference between the test coating plate and the color sample is slightly difficult to understand, and visual evaluation is difficult. × : Regarding the transparency, a difference between the test coating plate and the color sample cannot be made by visual evaluation.

  The present invention can be applied to the use of determining the color tone of a coating film formed with paint, ink, cosmetics, or the like.

FIG. 1 is a schematic diagram illustrating the configuration of a light irradiation apparatus used in the method of the present invention. FIG. 2 is a schematic diagram illustrating the configuration of the lamp of the light irradiation device used in the method of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light irradiation apparatus 2 Lamp 21 Light emission tube 22 Outer tube 23 Seal part 24 Lead 25 Base 26 Feeding pin 3 Mirror 4 Lens 5 Irradiator 6 Supporting support 7 Filter

Claims (4)

  The color tone of the coating film is characterized by irradiating the coating film with a light beam having a correlated color temperature of 5000 K or less by using a light irradiation device including a lamp that emits a light beam having a correlated color temperature of 5000 K or less. how to.   The method for judging the color tone of a coating film according to claim 1, wherein the coating film contains a luster pigment as part of its components.   The method for determining the color tone of a coating film according to claim 1 or 2, wherein the lamp is a ceramic metal halide lamp.   The method for determining the color tone of a coating film according to any one of claims 1 to 3, wherein the coating film is an automobile repair coating film.

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