JP2019084711A - Coating repaired article and coating repairing method - Google Patents

Abstract

To provide a coating repaired article and a coating repairing method, capable of easily conducting repair coating without need for high level skilled technique such as conventional graduation coating even for repairing a multilayer coating such as so called candy coating.SOLUTION: The vicinity of defect parts of a surface of a coated article is cure at first and a metallic base coated film 32 for repair containing a bright material and a pigment same as for a metallic base layer is formed inside thereof for coating repairing the defect parts 17 in the coated article 10 having the metallic base layer 14 and a colored base layer 15, a colored graduation base coated film 34 for repair containing the pigment same as in the colored base layer is formed so as to cover a wall surface 36, which is exposed on an outer periphery of the coated film when cure is removed, and coated repaired article is obtained.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a paint repair product and a paint repair method.

  As a method of repairing an appearance defect portion of coating due to foreign matter mixing etc. in a coated product such as a car body coating of a car, for example, a method called vocas coating such as Patent Document 1 and Patent Document 2 is known.

  Patent Document 1 describes a repair coating method for metallic paint of an automobile body or the like, and an aluminum flake pigment and a resin component are used as a paint composition to be used for vocasing coating which gradually spreads thinner as it goes away from the repair site. And the average thickness of the aluminum flake pigment is 0.34 μm or less, and the average particle diameter is in the range of 10 to 25 μm, and the content of the aluminum flake pigment based on the solid mass of the resin component contained in this paint composition Paint compositions having a content of 5 to 40% by weight are described.

  Patent Document 2 describes a repair painting method such as a car body, and the paint film surface is repair-painted with an undercoating material in order to make the difference in finishability between the repaired portion and the unrepaired portion inconspicuous. An undercoat paint is applied in advance to the entire coating surface including the repair area, and then the coating thickness of the colored base coating formed on the repair area becomes equal to or greater than the concealed film thickness by the application of the aqueous coloring base paint. And, it is described that the film thickness of the colored base coating film formed on the unrepaired area is brushed so that the film thickness becomes thinner with distance from the repaired area.

  On the other hand, in recent years, higher design properties are required in painting of automobiles etc. For example, lamination of two layers of a high hiding metallic base layer and a low hiding colored base layer as disclosed in Patent Document 3 A so-called candy coating method is known which has a vivid and deep color tone depending on the structure.

In Patent Document 3, in a laminated coating film in which a specific color is made to appear by a metallic base layer and a color clear layer, the highlight reflectance of a specific color is taken as R ^{H (P)} and a wavelength outside the hue range of the specific color. Laminated coating characterized in that the laminated coating satisfies the formula of ^{( RH (P)} / ^{RH (OA)} )> 60, where the average highlight reflectance of the area is ^{RH (OA).} Is described.

JP, 2014-79674, A JP 2005-87877 A JP, 2014-42892, A

  Usually, the coating range of Bokashi coating becomes a large coating range several hundred times and sometimes several thousand times as large as the defective part, and as the coating range of Bokashi coating becomes larger, the baking range of Bokashi coating also becomes larger. And it takes time for subsequent processing. In particular, it has been found that, in the case of a multi-layer coating such as the above-mentioned candy coating, it is necessary to apply a large area of white coat coating as compared to a coating in which a single basecoat only is used for color development. For example, in order to bake the defective portion of the candy coating of the car body at one time, a large-sized drying facility is required to have one car body. Therefore, since repair of the defective part of multilayer coating requires a lot of time, it is inefficient in mass production.

  Also, conventional bokashi coating is generally performed by skilled technicians. In particular, in the case of multi-layer coating such as the above-described candy coating, if it is intended to reduce the range of bokashi coating, or if a sudden change in coating film thickness occurs during bokashi coating, the floor The equipment is poor and the repaired part is easily visible. Therefore, it is difficult to secure the finished state with the characteristic of the candy coating for repairing the defective portion of the multilayer coating unless a highly skilled technician is used.

  Furthermore, the candy coating has an appearance feature that the change in color tone from the highlight side (near the reflected light) to the shade side (the shadow side away from the reflected light) is remarkable. The said characteristic is due to the orientation of the glittering material in the metallic base. Therefore, in order to maintain the characteristics of the candy coating even after the bokashi coating, it is important to reproduce the orientation of the glittering material in the metallic base in the bokashi coating. Therefore, it is difficult to secure a finished state with the characteristics of candy coating for repairing a defective portion unless it is a person with a high skill in vocasing coating skill.

  Therefore, in view of the above-mentioned problems, the present invention can easily carry out repair coating even in the case of repair of a multi-layer coating such as so-called candy coating, without requiring a highly skilled technique like the conventional bokashi coating. Aims to provide paint repair products and paint repair methods that can

  In order to achieve the above object, the present invention is, as one aspect thereof, a paint repair product, which is a paint product on the surface of a paint product comprising a metallic base layer and a colored base layer. A repair metallic base coating including a bright material and a pigment in common with the metallic base layer is provided over a region surrounding an internal defect, and the outer periphery of the metallic base coating for repair has a wall surface, and the wall surface Are colored with a pigment in common with the colored base layer.

  In the coloring of the wall surface, the paint repair product according to the present invention comprises a coloring blur base coating film containing a pigment in common with the coloring base layer so as to cover the wall surface of the outer periphery of the metallic base coating film for repair. Preferably, it is done.

  The content of the pigment contained in the color blur base coating film is preferably lower than the content of the pigment contained in the colored base layer.

  The paint repair product according to the present invention further comprises a colored base coating for repair containing a pigment in common with the colored base layer on the metallic base coating for repair, and the colored base coating for repair Preferably, the outer periphery of the film has a wall surface, and the film thickness of the metallic base coating film for repair is 4 to 7 μm, and the film thickness of the colored base coating film for repair is 3 to 6 μm.

  According to another aspect of the present invention, there is provided a method of painting and repairing a defect in a painted article provided with a metallic base layer and a colored base layer, wherein the periphery of the defect in the surface of the painted article is cured. Applying a metallic base paint for repair containing a glitter material and a pigment common to the metallic base layer to the inner side of the curing, to form a metallic base coating film for repair, and removing the curing. And exposing the wall surface of the outer periphery of the metallic base coating film for repair, and coloring the outer wall surface of the metallic base coating film for repair with a pigment in common with the colored base layer.

  The application of the metallic base paint for repair is preferably performed using a coating gun capable of forming a round pattern having a diameter of 0.3 mm to 0.6 mm.

  As described above, according to the present invention, the range of the repair coating can be minimized by curing the paint so as not to apply the portion which does not need to be repaired, and the predetermined amount of the predetermined paint in the predetermined range (target Coating with a metallic base coating for repair with a film thickness), so it does not require a highly skilled technique such as the conventional voxic painting. Specifically, without moving the gun tip of the coating gun, by specifying the gun distance, the discharge amount, and the spray time, it is possible to do without a skilled technician. Furthermore, the range of repair coating is narrow, and the repair coating can be fired at one time. Therefore, compared to the conventional blur repair method, the amount of paint required for the repair coating can be reduced to only a few tenths, and the time required for the repair coating is also about half or less. And can be reduced significantly. By curing, the outer periphery of the metallic base coating film for repair has a wall surface, and when the repair surface is viewed from an oblique direction, this wall portion becomes white, but the wall surface is colored with a pigment common to the coloring base layer By doing this, the wall surface portion can be made inconspicuous.

BRIEF DESCRIPTION OF THE DRAWINGS (a) is sectional drawing which shows typically the coated article which has a defective part which is repair object in one embodiment of the coating repair method which concerns on this invention, (b) is the top view. In one embodiment of the painting repair method concerning the present invention, it is a sectional view showing typically the painted article which carried out grinding out at the 1st process. (A) is sectional drawing which shows typically the coated article which cured in 2nd process in one embodiment of the coating repair method which concerns on this invention, (b) is the top view. (A) is sectional drawing which shows typically the coated article which formed the undercoat coating film for repair at 3rd process in one embodiment of the coating repair method which concerns on this invention, (b), FIG. (A) is sectional drawing which shows typically the coated article which formed the metallic base coating film for repair at 4th process in one embodiment of the coating repair method which concerns on this invention, (b), FIG. In 1 embodiment of the coating repair method which concerns on this invention, it is sectional drawing which shows typically the coated article in which the coloring base coating film for repair was formed at the 5th process. (A) is sectional drawing which shows typically the coated article which removed curing after 5th process in one embodiment of the coating repair method which concerns on this invention, (b) is the top view. (A) is sectional drawing which shows typically the coated article which formed the coloring blurring base coating film for repair at 6th process in one embodiment of the coating repair method which concerns on this invention, (b) , Its top view. (A) is sectional drawing which shows typically the coated article which formed the clear coating film for repair at 7th process in one embodiment of the coating repair method which concerns on this invention, (b), It is a top view. In one embodiment of the painting repair method concerning the present invention, it is a sectional view showing typically the repair painting goods obtained by baking and grinding at the 8th process.

  Hereinafter, with reference to the accompanying drawings, an embodiment of a coating repair method and a repair painted product according to the present invention will be described. The drawings are not drawn to scale because priority is given to understanding the invention.

  The painting repair method of the present embodiment includes a first step of polishing the surface of a painted article having a defect portion to be repaired, a second step of curing the periphery of the defect portion, and a surface to be repaired for repair. A third step of forming an undercoat film, a fourth step of forming a metallic base coating film for repair thereon, a fifth step of forming a colored base coating film for repair thereon, curing After removing, the sixth step of forming a colored and blurring base coating film in a wider range, the seventh step of forming a clear coating film for repair thereon, and the object to be repaired are fired to polish and repair the surface And an eighth step of obtaining a painted product.

[Paint gun]
As a coating gun for applying the paint used to form various coating films in the above-mentioned third step to the seventh step, even with a small discharge amount, it is excellent in atomization and excellent in pigment dispersibility. It is preferred to use an air atomization spray gun which makes it possible to form a continuous film. Moreover, it is preferable that an application | coating nozzle forms a round pattern from a viewpoint of narrowing of a pattern range, and the smoothness of a coating surface, and the aperture diameter is 0.3 mm-0.6 mm in diameter. As a specific example of such a coating gun, there is a round blow gun equivalent to a trade name RG-3L series manufactured by Anest Iwata Co., Ltd., which may be called a so-called air brush.

[Object of repair]
As shown in FIG. 1, the coated article 10 to be repaired according to the present embodiment has an electrodeposition coating layer 12, an intermediate coating layer (base layer) 13, a metallic base layer 14, and a colored base layer on a base material 11. 15. The clear coating layer 16 is provided in order. The base material 11 is, for example, a metal molded product such as an automobile or a two-wheeled vehicle, but may be a metal molded product for other uses. As a metal molded product, for example, metal base materials such as cold rolled steel sheet, galvanized steel sheet, high tensile steel, aluminum sheet, aluminum alloy and the like are preferable, but in various other plastics and all kinds of materials such as pottery and wood It is applicable also to what the multilayer coating film of the coloring base layer was formed.

  The electrodeposition coating layer 12 and the intermediate coating layer 13 are formed by the paint and method generally used for coating of a car etc. For example, the electrodeposition coating layer 12 may be formed of a cationic electrodeposition paint, and the middle coat layer 13 may be formed of a middle coat paint containing a polycarbodiimide compound and a melamine resin as a curing agent.

  The metallic base layer 14 is located on the deep side of a so-called candy coating multi-layer coating, and is a highly concealed layer containing a glitter material. A material of a known metallic base layer may be used as a material for forming the metallic base layer 14, and for example, a material in which a luster and a pigment are blended in a resin for base paint is used. As a resin for base paint, for example, acrylic resin, polyester resin, alkyd resin, fluorocarbon resin, urethane resin, silicone-containing resin, cellulose resin and the like are used. These resins for base paints may be used alone or in combination of two or more. The resin for the base paint may be an organic solvent system or a water system.

  As the glitter material, for example, aluminum flakes, vapor-deposited aluminum, colored aluminum or the like may be used. Examples of pigments include bright mica pigments such as interference mica pigments, white mica pigments and graphite pigments, metal oxide pigments such as titanium oxide and iron oxide, composite metal oxide pigments such as titanium yellow, carbon black, azo pigments, quinacridones Pigment, diketopyrrolopyrrole pigment, perylene pigment, perinone pigment, benzimidazolone pigment, isoindoline pigment, isoindolinone pigment, metal chelate azo pigment, phthalocyanine pigment, indanthrone pigment, dioxane Color pigments such as base pigments and indigo pigments, and extender pigments such as clay, kaolin, barium sulfate, barium carbonate, calcium carbonate, talc, silica, and alumina white may be used.

  Although the compounding quantity of a lusterless material is not specifically limited, For example, the resin of base paint is 100 weight%, and the range of 10 to 20 weight% is preferable. Although the compounding quantity of a pigment is not specifically limited, For example, the resin of base paint is 100 weight%, and the range of 10 to 20 weight% is preferable. In addition, as required, pigment dispersants, ultraviolet light absorbers, light stabilizers, polymer particles, dispersion aids, preservatives, silane coupling agents, antifoaming agents, curing catalysts, viscosity modifiers, organic solvents, neutralization You may contain coating additives, such as an agent.

  In order to form the metallic base layer 14, various materials of the metallic base layer described above are prepared into an organic solvent-based paint or a water-based paint which is dissolved and dispersed with an organic solvent or water, and applied to the surface of the middle coat layer 13 Do.

  The colored base layer 15 is located on the surface side of a so-called candy-coated multi-layer coating, and is a translucent or translucent low-masking layer. The material which forms the coloring base layer 15 may use a well-known coloring base paint, for example, the material in which the pigment was mix | blended with resin for base paints. As a resin for base paints, resin for base paints similar to metallic base layer 14 mentioned above may be used. As a pigment, the same pigment as the metallic base layer 14 described above may be used. Although the compounding quantity of a pigment is not specifically limited, For example, the resin of base paint is 100 weight%, and the range of 3 to 10 weight% is preferable. In addition, you may contain the additive for paints similar to the metallic base layer 14 as needed.

  In order to form the colored base layer 15, the various materials of the colored base layer described above are prepared as an organic solvent-based paint or a water-based paint which is dissolved and dispersed with an organic solvent or water and applied on the surface of the metallic base layer 14 Do.

  The clear paint layer 16 is a transparent layer located on the outermost surface of the paint 10. The material for forming the clear coating layer 16 may be a well-known clear paint material, for example, a curable paint containing an acrylic resin or a fluorine resin as a main agent and containing a polyisocyanate compound or the like as a curing agent, or cellulose acetate A resin for clear coating such as a lacquer based on a rate-modified acrylic resin is used. In addition, you may contain additives for paints, such as a ultraviolet absorber, a light stabilizer, a surface conditioner, a curing catalyst, as needed.

  In order to form the clear coating layer 16, the various materials of the clear coating layer described above are prepared as an organic solvent-based paint or a water-based paint which is dissolved and dispersed with an organic solvent or water, and applied to the surface of the colored base layer 15 Do. The layer thickness of the clear coating layer 16 is, for example, in the range of 25 to 40 μm, although it varies depending on the desired coating performance.

[Step 1: Grinding out]
As shown in FIG. 1, the defective portion 17 that may occur in such a coated product 10 is often the case where foreign matter mixes in the metallic base layer 14 or the colored base layer 15. Since the surface 16a of the clear coating layer 16 of the painted product 10 is raised at the portion of the defect portion 17 due to the contamination, first, the surface 16a of the painted product 10 is polished. For example, polishing is performed using sand paper or the like to smooth the surface.

  The sandpaper count is preferably # 1200 or more, and more preferably # 2000 to # 2500. When the sandpaper is less than # 1200, the paper grain is rough and it is difficult to form a smooth repair coating film of the coating film to be applied in the next step, and the metallic flakes of metallic base are oriented along the polishing eye. As a result, a glaring coating or a coating having a streak shape may be formed. On the other hand, sandpaper of # 3000 or more requires a lot of time for polishing because the polishing power is poor.

  The area to be polished is to polish the surface 16a over an area having a substantially circular or substantially elliptical shape 10 to 100 times, more preferably 20 to 50 times the diameter of the defect 17, centering on the defect 17. preferable. As shown in FIG. 2, the polishing depth is 10 to 100%, more preferably 20 to 40%, of the layer thickness of the clear coating layer 16 in the center of the polishing area, as shown in FIG. It is preferable to polish so that it becomes shallow.

[The second step: curing]
Next, as shown in FIG. 3, on the surface 16b of the painted article 10 after polishing, the diameter of the defect 17 is 1.2 to 5.0 times the center of the defect 17, more preferably 1.2. Leaving a polygonal or nearly circular or nearly elliptical area such as a square of about 1.5 times, and curing the periphery thereof with a plurality of curing materials 21 such as a solvent resistant adhesive masking tape. If the area surrounded by the curing material 21 is less than 1.2 times the diameter of the defect portion 17, there is a possibility that the defect portion 17 inside the coating can be visually recognized at a watermark angle. Moreover, when it exceeds 1.5 times, the range to repair becomes large, the energy concerning the increase in the usage-amount of the coating material for repair, and baking of a coating film increases, and it is unpreferable from the load with respect to an environment increasing.

[Third step: application of undercoat paint]
Then, as shown in FIG. 4, the undercoat paint is applied to the area surrounded by the curing material 21 with a paint gun to form the undercoat paint film 31. As an undercoat paint, it is preferable to use the material which forms the metallic base base layer 14 mentioned above (however, except for a bright material). As the resin for the base paint, any of the resins exemplified in the description of the metallic base layer 14 can be used, and either an organic solvent system or a water system may be used. Preferably, as the undercoat paint, a metallic base paint used to form the metallic base paint film 32 described later is obtained by removing the glitter material and the pigment. The undercoat paint is preferably a paint diluted to a low viscosity so that the paint solid content is, for example, a concentration of 8 to 13% by weight, more preferably 9 to 11% by weight, with a diluent. As the diluent, it is preferable to use, for example, a mixed organic solvent containing an aromatic hydrocarbon-based organic solvent mainly containing an ester-based organic solvent such as ethyl acetate and butyl acetate.

  In addition, a pigment may be optionally added to the undercoat paint. By blending the pigment, it is possible to solve the problem that the portion of the repair coating looks black from the shade side. As the pigment, for example, titanium oxide, white mica, other color pigments and the like may be used. The blending amount of the pigment is preferably 5 to 30% by weight, more preferably 20 to 25% by weight, based on 100% by weight of the total solid content of the undercoat paint.

  The film thickness of the undercoat film 31 is preferably 2 to 5 μm, more preferably 2 to 3 μm. If the film thickness is less than 2 μm, it is difficult to form a continuous film, and the releasability of the metallic base paint to be formed in the next step is reduced, so the orientation of a bright material such as aluminum flakes contained in the metallic base paint is reduced. There is a fear. Also, if the film thickness exceeds 5 μm, a plurality of coated films will be further formed thereon in the subsequent steps, so that the finally obtained repair coating film becomes too high, and the surface of the coated film repair product becomes large and convex It is not preferable because there is a possibility of becoming a shape.

[Step 4: Application of Metallic Base Paint]
Furthermore, as shown in FIG. 5, a metallic base paint is applied on the undercoat coating 31 with a coating gun to form a metallic base coating 32. It is preferable to use the material which forms the metallic base layer 14 mentioned above as a metallic base paint. The resin for the base paint may be the same type of resin as the metallic base or the different type resin, but it is preferable to use the same type of the glitter base and the pigment as the metallic base base layer. The metallic base paint is preferably a paint diluted to a high viscosity so that the total paint solids content is, for example, a concentration of 20 to 35% by weight, more preferably 25 to 30% by weight, with a diluent. As the base paint resin and diluent, it is preferable to use the same base paint resin and diluent as the undercoat paint.

The metallic base paint may increase the pigment weight concentration (PWC). PWC is calculated by the following equation. In this formula, the glittering material is treated as a pigment.
PWC = [(weight of pigment included) / (weight of total paint solids)] × 100

  As PWC of a metallic base paint, 30 to 40 weight% is preferred, and 30 to 35 weight% is more preferred. The PWC of the organic solvent-based paint used to form the metallic base layer 14 is generally about 15 to 25% by weight, and by thus increasing the PWC, the thickness of the metallic base coating 32 is obtained. Can be thinned.

  When the metallic base paint is applied onto the undercoat coating film 31, it is preferable to apply the metallic base paint before the solvent of the undercoat paint evaporates. This is because, when the metallic base paint has a high viscosity, the glittering material is difficult to orient, and it is sensitive to unstable factors such as the season, the weather fluctuation, the distance of the paint gun, and the film thickness. Since the orientation is not stable, the solvent of the undercoat film 31 can be taken in by applying the high viscosity metallic base paint before the solvent of the undercoat film 31 evaporates as described above, which is stable. Thus, the glittering material is oriented.

  The metallic base paint may further contain a silica pigment. By adding a silica pigment, the orientation of the glitter material after the glitter material flows can be controlled and can be further stabilized. The content of the silica pigment is preferably 0.5 to 8.0% by weight, more preferably 6.0 to 7.0% by weight, based on 100% by weight of the total solid content of the metallic base paint.

  The film thickness of the metallic base coating film 32 is set to a thickness that hides the defect portion 17 and is preferably 4 μm or more, for example. When the film thickness is less than 4 μm, it is difficult to conceal the defect portion 17 and there is a possibility that the coloration may be poor. On the other hand, since the thickness of the finally obtained repair coating is preferably as low as possible as described above, the thickness of the metallic base coating 32 is preferably 7 μm or less, more preferably 5 μm or less.

[Step 5: Application of Colored Base Paint]
Furthermore, as shown in FIG. 6, a colored base paint is applied by a paint gun on the metallic base paint film 32 to form a colored base paint film 33. As a coloring base paint, it is preferable to use the material which forms the coloring base layer 15 mentioned above. The resin for the base paint may be a resin of the same type as that of the colored base layer 15 or may be a different resin, but it is preferable to use a pigment of the same type as the colored base layer 15. The colored base paint is preferably a paint diluted with a diluent so that the total paint solid content is, for example, a concentration of 20 to 35% by weight, more preferably 25 to 30% by weight. As the base paint resin and the diluent, it is preferable to use the same base paint resin and diluent as the undercoat paint and the metallic base paint. In order to visually determine the completion of the film formation, it is preferable to use an organic solvent-based paint in which the whitening phenomenon of the pre-drying coating is unlikely to occur. In addition, regarding the undercoat coating film 31, the metallic base coating film 32, and the color blur base coating film 34 described later, since it is preferable that the coating system is the same type, these are also preferably organic solvent systems.

  The pigmented base paint may increase the pigment weight concentration (PWC). As PWC of a coloring base paint, 5 to 25 weight% is preferred, and 5 to 15 weight% is more preferred. The PWC of the organic solvent based paint used to form the colored base layer 15 is generally about 3 to 10% by weight, and the thickness of the colored base coating 33 can be increased by raising the PWC in this manner. Can be thinned.

  The film thickness of the colored base coating film 33 is a thickness that matches the hue of the repaired portion and the unrepaired portion, and is preferably, for example, 3 μm or more. If the film thickness is less than 3 μm, coloring is poor, and the metallic base coating film 32 has too strong a sense of brightness, which may cause discomfort. On the other hand, 6 micrometers or less are preferable and, as for the film thickness of the coloring base coating film 33, 4 micrometers or less are more preferable. When the film thickness exceeds 6 μm, coloring is strong, and the feeling of brightness of the metallic base coating film 32 is reduced, which may cause discomfort.

[Step 6: Application of tinted blur base paint]
After formation of the colored base coating film 33, as shown in FIG. 7, all the curing materials 21 are removed. Thereby, the undercoat coating film 31, the metallic base coating film 32, and the colored base coating film 33 are sequentially formed on the surface 16b of the coated article 10, and a laminate having wall surfaces 36 on the outer periphery is obtained. Then, as shown in FIG. 8, the color blur base paint is applied with a paint gun over the surface 16b of the coated article 10 on the outer peripheral side of the wall surface 36 and the surface of the color base paint film 33, Form 34.

  As the color blur base paint, the material forming the color base coating film 33 described above can be used, for example, the color base paint used for forming the color base film 33, the pigment content is a color base paint The resin solid content is preferably 100% by weight, preferably 0.2 to 2.0% by weight, and more preferably 0.2 to 1.0% by weight. If the pigment content is less than 0.2%, the coloring power is poor, and the amount of the paint used for coloring increases, which is not preferable in terms of cost. On the other hand, if it exceeds 2.0%, the coloring power becomes too strong, and the gradation of the coloring blur base coating film 34 formed on the outer peripheral side of the wall surface 36 becomes poor, which is not preferable.

  As described above, the surface 16b of the painted product 10 is ground so that the area around the defect 17 is deepest and gradually shallows outward from the center. The film thickness is configured to be gradually thinner from 36 to the outside. 3-10 micrometers is preferable on the surface of the coloring base coating film 33, and, as for the film thickness of the color | collar blurring base coating film 34, 5-8 micrometers is more preferable. At a position adjacent to the wall surface 36, the height needs to be at least higher than the height of the metallic base coating film 32. For example, 12 to 28 μm is preferable, and 14 to 20 μm is more preferable. It is preferable that the planar shape of the coloring and blurring base coating film 34 be approximately circular or approximately elliptical.

[Step 7: Application of clear paint]
Furthermore, as shown in FIG. 9, the clear paint is applied with a paint gun on the surface of the colored and blur base coating 34 and over the surface 16b of the paint 10 on the periphery thereof, and the clear paint is the top layer of the repair paint. Form 35. Acrylic resin, polyester resin, urethane resin, epoxy resin etc. are used as resin for clear coating. It is preferable that the clear paint be spread gradually and thinly outward from the center, but since the clear coating does not have gradation, the gradual decrease in film thickness may not be exact. The planar shape of the clear coating film 35 is preferably approximately circular or approximately elliptical.

[The eighth step: firing]
After the clear coating film 35 is formed, the entire coating film formed in the third to seventh steps is fired and cured. Then, the surface 35a of the clear coating film 35 is polished with a compound or the like and polished to obtain a smooth surface 35b as shown in FIG.

  As shown in FIG. 10, the repair-painted product thus obtained has an undercoat coating 31, a metallic base coating 32, and a colored base coating 33 over the area including the defective portion 17 on the above-described coated product surface 16b. Are sequentially laminated, and each of these coatings has a wall 36 on the outer periphery. In addition, over the surface 16a on the outer peripheral side of the wall surface 36 and the surface of the colored base coating film 33, a colored and blurred base coating film 34 is formed, and a clear coating film 35 is further formed thereon. The film thickness of the coloring and blurring base coating 34 is substantially uniform on the surface of the coloring base coating 33, and is thicker than the thickness from the surface 16b to the coloring base coating 33 at the position adjacent to the wall 36 It is getting thinner gradually towards.

  According to the painting repair method having the above steps, the range of the repair painting can be minimized by curing the curing material 21 so that the paint is not applied to the parts that do not need to be repaired, and the predetermined range is prescribed. Since the paint is applied in a predetermined amount (target film thickness), it does not require a highly skilled technique such as the conventional voxic paint. Specifically, without moving the gun tip of the coating gun, by specifying the gun distance, the discharge amount, and the spray time, it is possible to do without a skilled technician. Furthermore, the range of repair coating is narrow, and the repair coating can be fired at one time. Therefore, compared to the conventional blur repair method, the amount of paint required for the repair coating can be reduced to only a few tenths, and the time required for the repair coating is also about half or less. And can be reduced significantly.

  Due to the above-mentioned curing, the wall surface 36 exists on the outer periphery of the two layers consisting of the metallic base coating film 32 and the coloring base coating film 33, and when the repair surface is viewed from the vertical direction as in the position 40c of FIG. Although the hue matches the unrepaired part, the wall surface 36 of the metallic base coating film 32 looks white when viewed obliquely as in the positions 40a and 40b of FIG. 10, but at least the metallic base coating film By forming the colored and blurring base coating 34 so as to cover the outer peripheral wall of the base 32, the wall 36 is colored, and the wall portion of the metallic base coating can be made inconspicuous even when viewed from an oblique direction.

  In addition, the color blur base coating film 34 has a lower concentration of pigment than the color base coating film 33. This is because, when the color blur base coating film 34 contains the pigment at the same concentration as the color base coating film 33, the color blur base coating film 34 is formed thick in the area around the wall surface 36. As a result, it may be possible to prevent the occurrence of such darkening by lowering the concentration of the pigment of the color blur base coating 34 and minimizing the coloring. In addition, it is also possible to obtain the effect of leveling the edge angle of the wall surface 36.

  In the case of repairing a two-layered coating such as a so-called candy coating, the thickness of the repaired coating is larger than that of the conventional one because the repaired coating also has at least a two-layer structure. When the film thickness of the repair coating film is too thick, the surface of the repair coating film may be greatly raised, or the repair coating film may be scraped off in smoothing, and the hue may not match. By setting the pigment weight concentration (PWC) of both the metallic base coating 32 and the coloring base coating 33 higher than the PWC of the paint of each of the metallic base layer 14 and the coloring base layer 15, the metallic base coating 32 and Even if the film thickness of the colored base coating film 33 is reduced, the desired functions can be exhibited respectively, so that the entire repair coating film can be thinned.

  Also, in repairing candy coating, it is important to reproduce the orientation of the glitter material before repair, but when the paint of the metallic base coating film 32 is highly viscous, the glitter material is difficult to orient, and the defect of dust And the orientation conditions of the glitter material in the paint of the metallic base coating film 32 are sensitive to unstable factors such as the season, weather fluctuation, paint gun distance, film thickness, etc. There is a problem of not being stable. Then, if the dilution rate of the paint of the metallic base coating film 32 is increased to lower the viscosity, then the orientation is stabilized, but it is difficult to control the dilution process etc. When the dilution rate is too high and the viscosity becomes extremely low, There is a problem that the glittering material is difficult to orient. Therefore, by applying the high viscosity metallic base paint before the solvent of the undercoat coating 31 is volatilized, the solvent of the undercoat coating 31 can be taken in, which is a high viscosity metallic base paint. Also, the glitter material can be oriented stably.

  Furthermore, under the two-layer coating of the metallic base layer 14 and the colored base layer 15 which develop a candy coating, the base of the middle coat layer 13 is coated for securing the lightness. On the other hand, since the two layers of the metallic base coating film 32 and the coloring base coating film 33 corresponding to the above are coated on the surface 16 b of the painted product 10, the full shade side (the negative side away from the reflected light) When viewed from the side substantially parallel to the coating (on the coating side further than the position 40b in FIG. 10), only the portion applied to the repair coating has low brightness and appears dark. Therefore, by blending the pigment in the undercoat coating film 31 located below the metallic base coating film 32, it is possible to solve the problem of appearing black from the side of the shade.

DESCRIPTION OF SYMBOLS 10 paint goods 11 base material 12 electrodeposition coating layer 13 middle coat layer 14 metallic base layer 15 coloring base layer 16 clear coating layer 17 defect part 21 curing material 31 undercoat coating 32 metallic base coating film 33 coloring base coating film 34 coloring Blur base coating 35 clear coating 36 wall

Claims (6)

  On the surface of a coated article comprising a metallic base layer and a colored base layer, a metallic base coating for repair containing a bright material and a pigment in common with the metallic base layer is provided over a region surrounding a defect in the painted article. An outer surface of the metallic base coating film for repair has a wall surface, and the wall surface is colored with a pigment in common with the colored base layer.   The coloring of the said wall surface is made by providing the coloring blurring base coating film containing the pigment which is common in the said coloring base layer so that the wall surface of the outer periphery of the said metallic base coating film for repair may be covered. Paint repair products.   The paint repair article according to claim 1 or 2, wherein the content of the pigment contained in the color blur base coating is lower than the content of the pigment contained in the colored base layer.   The metallic base coating for repair further comprises a colored base coating for repair containing a pigment in common with the colored base layer, the outer periphery of the colored base coating for repair having a wall surface, The paint repair according to any one of claims 1 to 3, wherein the film thickness of the metallic base coating film for repair is 4 to 7 μm, and the film thickness of the colored base coating film for repair is 3 to 6 μm. Goods. A method of painting and repairing an internal defect of a painted article comprising a metallic base layer and a colored base layer,
Curing the periphery of the defect on the surface of the painted article;
Applying a metallic base paint for repair containing a bright material and a pigment common to the metallic base layer to the inner side which has been cured, to form a metallic base coating film for repair;
Removing the curing to expose the outer peripheral wall surface of the metallic base coating film for repair;
Coloring the outer peripheral wall surface of the metallic base coating film for repair with a pigment in common with the colored base layer. The coating repair method according to claim 5, wherein the coating of the metallic base paint for repair is performed with a coating gun capable of forming a round pattern having a diameter of 0.3 mm to 0.6 mm.

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