JP2008307476A - Coating color determination method of primer surfacer and repaired coating film forming method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating color determination method of a primer surfacer capable of determining the coating color of the primer surfacer without causing difference in hue between a repairing part and another part even if repairing base coating is not thickly applied in a case that a laminated coating film having flip-flop properties is repaired. <P>SOLUTION: In the coating color determination method of the primer surfacer for repairing the laminated coating film having flip-flop properties and a 60° glass value of 50 or above, the coating color of the coating film obtained from the primer surfacer is adjusted to an achromatic color having 105° maximum reflectivity being 0.8-1.2 times the 105° maximum reflectivity of the laminated coating film at a wavelength of 400-700 nm. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a primer surfacer coating color determining method and a repair coating film forming method.

For repairing damage to the paint film surface of automobile outer panels, etc., the base paint for repair is usually applied after sanding to the periphery of the damaged part, putting it, putting primer surfacer, etc. And it is performed through the process of applying a clear paint for repair.

In such repair, the damaged part and the undamaged part are present on the object to be coated at the same time, so when repairing the damaged part, only the repaired part is visually repaired with other parts that are not repaired. Being recognized as a different color tone is a serious problem. In order to prevent such a situation, it is necessary to adjust the color of the base paint for repair. However, such color adjustment of the base paint for repair has experience and skill, and it is easy to paint There was a need for a means to adjust

When applying such a repair base paint, the primer primer surfacer coating color may be seen through unless the cover is completely concealed. The coating must be thick enough to be concealed, causing a reduction in work efficiency. In particular, when the base paint for repair is a water-based paint, it cannot be applied again unless a drying process called flash-off is performed, and the work efficiency is remarkably reduced. As a method for solving this problem, there has been a method of adjusting the paint color of the primer surfacer.

However, even when the repair base paint is applied thickly and the repair coating film is considered to be completely concealed when viewed from the front, the base may be transparent depending on the paint color. That is, even when there is almost no difference in color tone between the repaired portion and other portions when viewed from the front direction, the difference may be remarkably increased depending on the viewing angle. This is seen when the coating film is a laminated coating film including a base coating film having a visual anisotropy called flip-flop property and a clear coating film.

In Patent Document 1, a color primer is prepared by mixing a primer (A) whose lightness is adjusted by mixing white and black with a color top coating (B) to be applied on the primer coating film. Is disclosed. However, there is no description regarding the selection of the primer surfacer coating color in consideration of the visual anisotropy in the metallic coating film.

In patent document 2, after applying a primer composition, it has the process of apply | coating the topcoat which achieves the color match with a topcoat and a support body of a non-repair part by a small amount of coating, An improved method of applying a gray or white primer composition having essentially the same reflectivity in the dry state as the topcoat reflectivity measured at the wavelength of minimum absorption is disclosed.

However, this method only describes the use of a gray or white primer having the same reflectance as that of the top coat, and in consideration of the anisotropy of the metallic coating film, There is no mention of selecting a paint color.
JP 2002-20694 A Special table 2000-510043 gazette

In view of the above situation, the present invention produces a difference in color tone between the repaired portion and the other portions even when the base coating for repairing is not thickly applied when repairing the laminated coating film having flip-flop properties. It is an object of the present invention to provide a primer surfacer coating color determining method and a repair coating film forming method capable of determining a primer surfacer coating color that does not occur.

The present invention relates to a primer surfacer coating color determination method for repairing a laminated coating film having flip-flop properties and a 60 ° gloss value of 50 or more, wherein the primer surfacer has a wavelength of 400 to 700 nm. A laminate having flip-flop properties, characterized in that the coating color is adjusted to an achromatic color having a maximum reflectivity of 105 degrees that is 0.8 to 1.2 times the maximum reflectivity of 105 degrees of the multilayer coating film. This is a primer surfacer coating color determination method for repairing a coating film.

The laminated coating film preferably includes a base coating film and a clear coating film.
The base coating film preferably contains a luster pigment.
The base coating film may be lightly colored.
The 105 degree maximum reflectance at a wavelength of 400 to 700 nm of the laminated coating film is preferably 10% or less.

The present invention applies a primer surfacer whose coating color is determined by the above-described coating color determination method to an object on which a laminated coating film having flip-flop properties and a 60 ° gloss value of 50 or more is formed. And it is also a repair coating film formation method characterized by having the process of forming a primer surfacer coating film.
The present invention applies a primer surfacer whose coating color is determined by the above-described coating color determination method to an object on which a laminated coating film having flip-flop properties and a 60 ° gloss value of 50 or more is formed. Forming a primer surfacer coating, applying a repair base coating on the primer surfacer coating to form a repair base coating, and repairing clear coating on the repair base coating It is also a repair coating film forming method characterized by having a step of sequentially forming a clear coating film for repair by applying a coating.
The object to be coated is preferably a vehicle body or a part of an automobile or a motorcycle.
Hereinafter, the present invention will be described in detail.

In the first aspect of the present invention, the coating color obtained from the primer surfacer is applied at a wavelength of 400 to 700 nm, and the maximum reflection at 105 degrees is 0.8 to 1.2 times the maximum reflectance at 105 degrees of the laminated coating film. It is a primer surfacer coating color determination method for repairing a laminated coating film having flip-flop properties, characterized in that it is adjusted to an achromatic color having a rate.

As mentioned above, it is not necessary to ensure the concealment of the groundwork by applying a thick base paint for repair, and a primer that does not cause a color difference between the repaired part of the laminated coating and other parts Various proposals have been made for the method of selecting the surfacer coating color. However, such conventional methods consider the difference in color tone due to the light reflection anisotropy in the laminated coating film having flip-flop properties. The primer surfacer color was selected.
In addition, the said laminated coating film which has the said flip flop property is what colors, such as a different hue and / or brightness, are seen by reflection of light and interference by a viewing angle.

In the primer surfacer coating color determination method of the present invention, the examination is performed based on such anisotropy, and the primer surfacer coating color is determined based on the 105-degree maximum reflectance of the laminated coating film. It was completed by finding out that it is possible to repair an extremely good laminated coating without applying a thick base coating and completely hiding the base.

The primer surfacer coating color determination method of the present invention can be suitably applied even when the color of the repair base coating film is light.
When repairing a laminated coating film having flip-flop properties, if a repair base coating film with the same color as the non-repaired portion is formed on the repaired portion, the underscore will be generated if the film thickness is insufficient. A coating film having a uniform color tone is not formed. Specifically, the underlay is a phenomenon in which, when viewed from the front direction, the repaired portion can be seen through, even if the repaired portion is hidden. Here, as shown in FIG. 1, the “front direction” is a direction of 15 degrees when the regular reflection light of incident light of 45 degrees with respect to the coating plate is 0 degree, and the “squash direction” is The direction is 105 degrees when the regular reflection light is 0 degree.
Such a problem tends to be prominent particularly in a light-colored coating film among laminated coating films having flip-flop properties.

The laminated coating film having the flip-flop property is a coating film having different hue and / or lightness in the front direction and the skew direction.

That is, the present invention eliminates the difference in color tone between the repaired part and the part that is not repaired by selecting a color that matches the reflectance of the laminated coating film in the scaly direction as the primer surfacer coating color. Even if the base paint for repair is not thickly coated, it is possible to suitably obtain a coating film appearance that can be identified with a portion that is not subjected to repair.

When the laminated coating film is repaired using the primer surfacer having the coating color determined according to the present invention, it is not necessary to apply the repair base paint thickly. For this reason, the usage-amount of the base paint for repair can be reduced, work time can be shortened, and the cost in a repair process can be reduced. Furthermore, after construction, it is possible to prevent the occurrence of failure that the color tone differs depending on the surroundings and visual observation in the scuffing direction, and it is possible to reduce the failure cost caused by the failure.

The 60 degree gloss value of the multilayer coating film to which the primer surfacer coating color determining method of the present invention can be applied is 50 or more. If it is less than 50, the influence of gloss on the hue becomes large, and it becomes difficult to adjust the coating color of a coating film obtained using a primer surfacer with a maximum reflectance of 105 degrees. Preferably, it is 60 or more. The gloss value can be determined using a measuring instrument well known by those skilled in the art, such as a colorimeter.

Examples of the laminated coating include an undercoat coating such as an electrodeposition coating on an object to be coated, an intermediate coating, and a coating having a top coating on the coating. The top coating film preferably includes a base coating film and a clear coating film.

The base coating film preferably contains a glitter pigment. By containing the glitter pigment, a coating film having flip-flop properties can be obtained. The coating film having the flip-flop property expresses different brightness depending on whether the coating film is viewed from the front direction and when viewed from the skew direction. The coating color determination method of the present invention can be suitably applied particularly to a coating color including such a bright pigment.
Examples of the glitter pigment include non-colored or colored metal glitter materials such as aluminum, copper, zinc, iron, nickel, tin, and aluminum oxide, or alloys, and mixtures thereof. In addition, interference mica pigments, white mica pigments, graphite pigments and the like can also be mentioned.

The base coating film may be lightly colored. The coating color determination method of the present invention can be suitably applied even if the background color is a light color that is easy to see through. Here, the light color indicates that the reflectance at 45 degrees is 15% or more. The measurement of the reflectance at 45 degrees is the same equipment and conditions as the measurement of the reflectance at 105 degrees described later, and as shown in FIG. 1, the angle of 45 degrees with respect to the coated plate on which the laminated coating film is formed. Means the ratio of the reflected light to the incident light in the direction of 45 degrees, where the direction of the regular reflection light when the light is incident on is 0 degree.

The 105-degree maximum reflectance of the laminated coating film at a wavelength of 400 to 700 nm is a value obtained by measuring a portion of the laminated coating film that is not repaired. However, the 105-degree maximum reflectance of the above-mentioned multilayer coating film is a multilayer coating formed by forming a primer surfacer capable of forming a coating film having a coating color determined by the primer surfacer coating color determination method of the present invention on the body of an automobile or a motorcycle. When used for film repair, it may be replaced with the maximum reflectivity of 105 degrees recorded in the coating film of a new vehicle. The color of the laminated coating film formed on automobiles and motorcycle bodies changes over time due to corresponding deterioration, etc., but the 105-degree maximum reflectance at a wavelength of 400 to 700 nm of the laminated coating film is different between the time of new vehicle and the time of repair. This is because it does not change extremely.

Here, the 105 degree maximum reflectance of the laminated coating film at a wavelength of 400 to 700 nm used in the present specification and the like means that the portion of the laminated coating film that is not damaged and is not repaired has a wavelength of 400 to 400 nm. The maximum value of the reflectance when the reflectance at 105 degrees is measured in the range of 700 nm.

As shown in FIG. 1, the reflectance at 105 degrees is 105 degrees assuming that the direction of specularly reflected light is 0 degrees when light is incident at an angle of 45 degrees on the coated plate on which the laminated coating film is formed. It means the ratio of reflected light to incident light in the direction of degrees. Specifically, the reflectance is obtained by reflectance measurement using a colorimeter, and is measured by setting the color temperature of the measurement light source to about 3000 Kelvin, and the set light source is a D65 light source by mathematical processing. , The field of view can be obtained as 10 degrees. Examples of such a measuring instrument include model MA61B (manufactured by X-rite).

In the present invention, the primer surfacer is coated with an achromatic color having a maximum reflectivity of 105 to 0.8 times 1.2 times the maximum reflectivity of 105 degrees of the multilayer coating film at the wavelength of 400 to 700 nm. The color is adjusted.
Specifically, the maximum reflectivity of 105 degrees in the wavelength range of 400 to 700 nm of the coating film obtained from the primer surfacer is the maximum reflectivity of 105 degrees in the wavelength range of 400 to 700 nm of the portion not subjected to the repair of the laminated coating film. It means 0.8 to 1.2 times the value.

The 105-degree maximum reflectance of the primer surfacer coating color is a primer surfacer coating film formed by applying a primer surfacer and drying it more than the film thickness that completely hides the ground even when viewed from the front direction and the direction of the skewer. Is the maximum value of the reflectance when the reflectance at 105 degrees is measured in the wavelength range of 400 to 700 nm. The reflectance at 105 degrees can be obtained by the same measurement method as the reflectance at 105 degrees in the above-described laminated coating film.

When the value is less than 0.8 times, the repair base coating and the repair clear coating on the primer surfacer coating appear darker, and when the value exceeds 1.2 times, the primer surfacer Since the base coating film for repair and the clear coating film for repair on the coating film appear to be bright colors, the film thickness becomes thick in order to make the repaired part of the above-mentioned laminated coating film have the same color tone as the other parts. Thus, there is a problem that the painting work time becomes long. The value is preferably 0.9 to 1.1 times.

The primer surfacer paint color is achromatic, and the achromatic color means white, black or an intermediate color thereof. The 105 degree maximum reflectance of the primer surfacer coating color can be adjusted by adjusting the lightness of the primer surfacer used to form the coating film. More specifically, the black primer surfacer and the white primer are used. This can be appropriately carried out by adjusting the blending amount with the surfacer.

The primer surfacer is not particularly limited as long as it can form a coating film having the maximum reflectance of 105 degrees, and the resin component to be used and the color pigment to be used should be those that can be usually used in the primer surfacer. Can do.

2nd this invention is also a repair coating-film formation method using the primer surfacer which determined the coating color based on the coating color determination method of the primer surfacer mentioned above.
That is, in the repair coating film forming method, the primer surfacer is applied to an object to be coated on which a laminated coating film having a flip-flop property and a 60 ° gloss value of 50 or more is formed. A step of forming a coating film.
The repair coating film forming method further includes a step of applying a repair base coating on the primer surfacer coating to form a repair base coating, and a repair clear on the repair base coating. It has a process of applying a paint to form a clear coating film for repair.

Usually, when repairing a part deformed due to damage such as an accident about the outer plate of an automobile body, etc., after polishing the damaged part that becomes the repaired part and its periphery, filling the unevenness with a putty, and polishing again, for example, A primer surfacer is applied and polished once again, and then a repair base paint and a repair clear paint are applied to form a laminated coating film.

The repair coating film forming method was determined by the coating color determining method for the repaired part prepared by applying and polishing the putty of the object on which the laminated coating film having flip-flop properties was formed. It has the process of apply | coating a primer surfacer and forming a primer surfacer coating film.

The laminated coating film has a 60 ° gloss value of 50 or more. The gloss value is a value obtained by the method described above.
The object to be coated is preferably a car body or a part of an automobile or a motorcycle, but may be other articles that require similar repairs.

The primer surfacer coating film can be formed by drying, heating and / or curing with ultraviolet rays after application of the primer surfacer. The coating method, drying, heating and / or curing method using ultraviolet rays are not particularly limited, and conventionally known methods can be applied.
The film thickness of the primer surfacer coating film is not particularly limited, and for example, the dry film thickness is preferably 50 to 100 μm.

The repair coating film forming method further includes a step of forming a repair base coating film by applying a repair base coating after forming the primer surfacer coating film.
The repair base paint is not particularly limited, and known ones can be used, but it is preferable that a coating film having flip-flop properties can be formed.
Examples of the base paint for repair that can form a coating film having flip-flop properties include paints containing glitter pigments. The luster pigment is not particularly limited, and examples thereof include non-colored or colored metal luster materials such as aluminum, copper, zinc, iron, nickel, tin, aluminum oxide, and the like, and mixtures thereof. be able to. Further, interference mica pigments, white mica pigments, graphite pigments and the like are included in this. Further, it may contain coloring pigments well known by those skilled in the art.
The repair base paint is preferably one that cures at a relatively low temperature and one that cures at room temperature. The repair base coating may be a solvent-based coating or a water-based coating.

The method for applying the repair base paint and the method for forming the coating film are not particularly limited, and known methods can be used. The film thickness of the repair base coating film can be set as necessary while adjusting the thickness so as not to cause a difference in appearance such as a step between the repaired portion and the unrepaired portion. If a step or the like occurs, it can be corrected by a method well known by those skilled in the art, such as sanding.
When the primer surfacer determined by the coating color determination method of the first aspect of the present invention is used, the thickness of the base coating film for repair is not a thick film, and other parts that are not repaired parts, color tone and appearance It is possible to form a repaired part without any difference.

The repair coating film forming method further includes a step of applying a repair clear coating on the repair base coating to form a repair clear coating.
Examples of the clear paint for repair include those similar to the clear paint used for forming the clear paint film included in the laminated paint film of the portion not subjected to the repair. Also, various types such as those that cure at a relatively low temperature and those that cure at room temperature can be mentioned.
The method for applying the repair clear paint is not particularly limited, and examples thereof include known methods. In addition, the clear coating film for repair can be formed by a known method. The film thickness of the clear coating film is not particularly limited as long as it is a general film thickness as a clear coating film.

Since the present invention has the above-described configuration, it is possible to efficiently determine an optimum primer surfacer coating color, particularly for a coating color including a bright pigment whose hue changes due to a difference in observation angle. it can. For this reason, the primer surfacer coating color determination method and the repair coating film forming method of the present invention can be suitably used in a coating film repairing process for automobile bodies or parts.

EXAMPLES Hereinafter, although an Example is hung up and demonstrated in more detail about this invention, this invention is not limited only to these Examples.

Example 1
Metallic base coating material A (nax ode base, manufactured by Nippon Paint Co., Ltd., with a film thickness of 12 μm to completely hide the base) is applied to a steel sheet with a length of 150 mm and a width of 70 mm on which an intermediate coating film is formed. After forming a base coating film by spraying, a clear paint (nax Multi-Eco (2: 1) Mirror Clear, manufactured by Nippon Paint Co., Ltd.) is spray-coated to a dry film thickness of 50 μm and dried. A test plate provided with a total of 7 laminated coating films of metallic coating color A was prepared. The 60 ° gloss value of this multilayer coating film is 85, the reflectivities of 45 ° and 75 ° are 24.83 and 8.64, respectively, and the maximum reflectivity of 105 ° at a wavelength of 400 to 700 nm is 5.99. It was.
The lower half of the test plate was polished under running water until the steel plate was seen using sandpaper, then dried, and seven kinds of gray primer surfacers with different maximum reflectivity of 105 degrees (films that completely covered the substrate) A primer surfacer coating film was formed by spray-coating each with a thickness of 40 μm so that the dry film thickness was 50 μm. After that, the primer surfacer coating film is polished, and the base coating film is formed by spraying the metallic base coating A so as to have a dry film thickness of 10 μm, and then the clear coating (nax multi-eco (2: 1) mirror Clear (manufactured by Nippon Paint Co., Ltd.) was spray-coated to a dry film thickness of 50 μm and dried to form a clear coating film.

The obtained coating film was visually evaluated for the degree of scaling in the scaly direction of the primer surfacer coating film as a base.
○: The primer surfacer paint color cannot be confirmed.
(Triangle | delta): The coating color of a primer surfacer can be confirmed slightly.
X: The primer surfacer coating color can be clearly confirmed.

The gray primer surfacer used was prepared by mixing the white paint and black paint of nax Urethane Plastic Surf Pro V1 according to Table 1. Table 1 shows the maximum reflectances of 45 degrees, 75 degrees, and 105 degrees of the coating films formed by the respective primer surfacers.
In addition, 45 degree | times and 75 degree | times reflectance in the Example in this specification, and 105 degree | times maximum reflectance in wavelength 400-700 nm were all measured with model MA61B (X-rite company colorimeter).
In particular, the maximum reflectivity of 105 degrees was determined from numerical data obtained by computer analysis, setting the color temperature of the measurement light source to about 3000 Kelvin, setting the set light source as a D65 light source, and viewing the field at 10 degrees by mathematical processing. .

(Example 2)
In Example 1, instead of the metallic base paint A, a metallic base paint B (nax ode base, manufactured by Nippon Paint Co., Ltd., the film thickness for completely hiding the base is 12 μm) was used for testing in the same manner as in Example 1. A board was created. The 60-degree gloss value of the obtained multilayer coating film is 88, the 45-degree and 75-degree reflectivities are 36.72 and 26.22, and the 105-degree reflectivity at a wavelength of 400 to 700 nm is 23.23. Met. The obtained test plate was evaluated in the same manner as in Example 1. The results are shown in Table 1.

From Table 1, the coating color obtained from the primer surfacer is 105 degrees, which is 0.8 to 1.2 times the maximum reflectance of 105 degrees in the multilayer coating film to be the same color tone at a wavelength of 400 to 700 nm. By having the highest reflectivity, it is possible to form a repair coating film that does not feel uncomfortable with parts that are not repaired in the front direction and the scuffing direction, even if it is thinner than the film thickness that can completely hide the base. I knew it was possible. Further, it was found that such a repair coating film can be suitably obtained even when a light-colored metallic base paint having flip-flop properties is used.
On the other hand, when a primer surfacer outside the above range was used, it was found that there was a sense of incongruity with the part that was not repaired in the front direction and the skew direction.

The primer surfacer coating color determining method and the repair coating film forming method of the present invention can be suitably applied to a coating film repairing process of an automobile or the like.

It is the schematic which shows a hue observation direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light source 2 Regular reflection light 3 Front direction 4 Squash direction 5 Coated board

Claims (8)

In the primer surfacer coating color determination method for repairing a laminated coating film having flip-flop properties and a 60 degree gloss value of 50 or more,
The coating color obtained from the primer surfacer has a 105-degree maximum reflectance which is 0.8 to 1.2 times the 105-degree maximum reflectance of the multilayer coating film at a wavelength of 400 to 700 nm. A primer surfacer coating color determining method for repairing a laminated coating film having flip-flop properties, characterized by adjusting the coloring. The primer surfacer coating color determining method according to claim 1, wherein the laminated coating film includes a base coating film and a clear coating film. The primer surfacer coating color determining method according to claim 2, wherein the base coating film contains a luster pigment. 4. The primer surfacer coating color determination method according to claim 2, wherein the base coating film is lightly colored. The method for determining the primer surfacer coating color according to claim 1, 2, 3, or 4, wherein the 105-degree maximum reflectance of the laminated coating film at a wavelength of 400 to 700 nm is 10% or less. 6. A coating color determination method according to claim 1, 2, 3, 4 or 5 on a workpiece on which a laminated coating film having flip-flop properties and a 60 ° gloss value of 50 or more is formed. A method for forming a repair coating film comprising the step of applying a primer surfacer determined to form a primer surfacer coating film. 6. A coating color determination method according to claim 1, 2, 3, 4 or 5 on a workpiece on which a laminated coating film having flip-flop properties and a 60 ° gloss value of 50 or more is formed. Applying the primer surfacer determined to form a primer surfacer coating, applying a repair base coating on the primer surfacer coating to form a repair base coating, and the repair base coating A repair coating film forming method comprising a step of applying a repair clear coating material on a film to form a repair clear coating film. The method for forming a repair coating film according to claim 6 or 7, wherein the object to be coated is a car body or a part of an automobile or a motorcycle.

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