JP2007084726A - Method for repairing matte coating and matte coating composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for repairing a defective part of a coating film obtained by matte coating so that a feeling of gloss is uniform. <P>SOLUTION: The coating composition comprises particulate matting materials [A] and [B] having different average particle diameters. The coating composition comprises 1-20 parts wt. of the matting material [A] and 4-35 parts wt. of the matting material [B] in the 100 parts wt. of the solid of the coating composition. A repair part is coated with a first matting material for repair having 10-40 parts wt. total of the matting material [A] and the matting material [B] and the circumference of the repair part is coated with a second matting material for repair having a gloss value higher than that of the first matting material for repair. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a matte paint repair method for repairing coating defects such as blisters generated in a matte paint film, a matte paint composition used for the repair, and a matte paint film using the matte paint composition About.

  The matte feeling of the paint film is manifested by the matte material contained in the paint being oriented on the surface layer of the paint film during baking to make the paint surface uneven and reflecting light irregularly. Refers to such a coating film having a low specular reflectance. It is applied to various things including vehicles.

  By the way, in the case where a coating failure due to the rust occurs in the matte coating of the matte coated object, a partial repair coating may be performed instead of the entire surface repainting.

  This type of matte paint repair method involves sharpening the repaired part where the coating failure has occurred to remove foreign matter, and then applying the same type (same composition) of the paint used in the matte paint. There is a way to repair. However, in the conventional repairing method, the matte paint is scattered around the repaired part and the convex part is generated by the paint dust adhering to it, so that the appearance of the painted surface is impaired.

  For this reason, it is necessary to polish the convex part around the repaired part, it takes a long time to polish in the repair process, and the polishing work of the convex part is difficult to mechanize and must be done manually. There was also a problem that it would lead to cost increase.

  Therefore, the repair part is sharpened with paper, a matte paint for repair is applied, and then the paint dust is sprayed with a blurring liquid (matte clear paint including matte material) and finally baked. A repair method has also been proposed in which the dust remains inconspicuous and the appearance is not impaired (see, for example, Patent Document 1).

However, in the repair method described in Patent Document 1, the repaired part is said to have a different gloss feeling, although the repaired part is restrained from generating a convex part that is considered to be poorly painted around the repaired part. There's a problem. As described above, the matte feeling of the coating film is obtained by irregular reflection of light because the matting material contained in the coating is oriented on the surface layer of the coating film to make the coating surface uneven during baking. Therefore, depending on the film thickness and baking conditions, the orientation of the matte material in the matte paint on the coating layer differs, and the matte feeling is different.
JP 62-124160 A

The present invention relates to a method for repairing a defective portion of a matte-coated film so that the glossiness is uniform, a matte paint composition used for the repair, and a matte paint using the matte paint composition. It aims at providing a coating film.
In order to achieve the above object, the matte paint of the present invention is a paint composition containing particulate matte materials [A] and [B] having different average particle diameters, wherein the solid content of the paint composition is 100% by weight. 1 to 20 parts by weight of the matting material [A] and 4 to 35 parts by weight of the matting material [B] are included in the part, and the total of the matting material [A] and the matting material [B] Is 10 to 40 parts by weight.

  Further, the matte paint repair method of the present invention comprises a step of sharpening a repair portion of a matte coating film formed by painting the matte paint, and the repair portion is substantially the same as the matte clear paint. A step of applying a matte paint for the first repair of the composition, a step of applying a matte paint for the second repair having a gloss value higher than that of the first matte paint for repair around the repair portion, and And bake the matte paint for the first repair and the matte paint for the second repair.

  In the present invention, after the repair portion is coated with the first repair matte composition having substantially the same composition as the matte paint containing the matte materials [A] and [B], the gloss is more glossy than the first repair matte paint. Since the periphery of the repaired part is painted with a matte paint for repair, which includes a matte material with a high value, more specifically, an average particle size of less than 6 μm, the film thickness and baking conditions of the repair coating film Even if it fluctuates with respect to the non-repaired part, the variation in the orientation of the matte material on the repair coating surface due to this is extremely small, and the matte feeling between the non-repaired part and the repaired part is substantially uniform. can do. As a result, the glossiness between the repaired part and the repaired part becomes uniform, and product quality can be ensured. Further, since it is not necessary to polish the boundary between the repaired part and the repaired part, the time required for repairing can be shortened.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
《Matte coating composition》
The coating composition of this example includes matting materials [A] and [B] having different particle diameters, and 1 to 20 parts by weight of matting material [A] in 100 parts by weight of the solid content of the coating composition. The resin beads as the matte material [B] are included in an amount of 4 to 35 parts by weight, and the sum of the resin beads as the matte material [A] and the matte material [B] is 10 to 40 parts by weight.

  The matting material [A] is a matting material having an average particle size of 1 to 15 μm, and the matting material [B] is a matting material having an average particle size of 2 to 30 μm. ], [B] The average particle size ratio [A] / [B] is 1/20 to 1/2.

  That is, the matte material [A] contained in the matte paint of this example has an average particle size of 1 to 15 μm, more preferably 2 to 10 μm. When the thickness is less than 1 μm, the matte feeling and shading of the shade part are reduced or eliminated, and the glossiness around the repaired part and the non-repaired part and between the repaired part and the repaired part is not uniform. On the other hand, if the average particle diameter exceeds 15 μm, the appearance of the coating film, the repaired part and the non-repaired part, and the painted part around the repaired part and the repaired part are deteriorated and the design properties are lowered.

  As the matting material [A], a commercially available amorphous matting material can be used. For example, organic matting materials such as silk protein (silk pulverized product), polyethylene wax, talc / calcium carbonate, Examples thereof include extender pigments such as clay, kaolin, and silica.

  The matting material [A] is preferably contained in an amount of 1 to 20 parts by weight, more preferably 6 to 18 parts by weight in 100 parts by weight of the solid content of the coating composition. If it is less than 1 part by weight, the matte feeling and shading of the shade part may be reduced or eliminated. On the other hand, if it exceeds 20 parts by weight, glossiness due to scratches occurs.

  In particular, in this example, glossiness due to scratches is less likely to occur by blending the resin beads as the matting material [B].

  The resin beads which are the matting material [B] preferably have an average particle diameter of 2 to 30 μm, more preferably 5 to 20 μm. When the thickness is less than 2 μm, the matting effect is small. On the other hand, when the thickness exceeds 30 μm, the appearance of the coating film is deteriorated and the design property is lowered. The resin beads that are the matte material [B] may be transparent resin beads or colored.

  Examples of the resin beads in this example include acrylic resin beads, urethane resin beads, polyester resin beads, polyamide resin beads, polystyrene resin beads, polyethylene resin beads, melamine resin beads, urea resin beads, fluorine resin beads, and polyacrylonitrile resin. Examples thereof include beads.

  The resin beads as the matting material [B] are preferably included in an amount of 4 to 35 parts by weight in 100 parts by weight of the solid content of the coating composition. When the amount is less than 4 parts by weight, glossiness due to scratches occurs, whereas when it exceeds 35 parts by weight, glossiness due to scratches is good, but the appearance of the coating film is deteriorated and the design properties are lowered.

  In this example, the total amount of the resin beads as the matting material [A] and the matting material [B] is preferably 10 to 40 parts by weight in 100 parts by weight of the solid content of the coating composition. When the amount is less than 10 parts by weight, a low gloss coating, that is, a coating having a desired matte feeling cannot be obtained. On the other hand, if it exceeds 40 parts by weight, the cohesive strength of the coating film is reduced and scratches are easily formed.

  The matte coating composition of this example includes a resin binder, and optionally a curing agent and additives.

  The resin binder contained in the matte coating composition of this example is not particularly limited, and examples thereof include acrylic resins, urethane resins, polyester resins, polyamide resins, polystyrene resins, polyethylene resins, fluororesins, polyacrylonitrile resins, and the like. be able to. This resin binder is a resin that dissolves in the solvent used when the coating composition is solvent-based, and is different from the resin beads that are the matting material [B]. The resin binder preferably has a number average molecular weight of 1000 to 30000. When it is less than 1000, the physical properties of the coating film are inferior, and when it exceeds 30000, the viscosity of the coating composition itself becomes high and the coating workability is poor.

  The curing agent contained in the matte coating composition of this example is not particularly limited and can be selected according to the resin binder, and examples thereof include melamine resins, polyisocyanate compounds, and blocked isocyanate compounds. .

  Examples of the additive contained in the matte coating composition of the present example include conventionally known additives such as a surface conditioner, a viscosity control agent, a cracking inhibitor, and an organic solvent.

  As the viscosity control agent, a fatty acid amide swelling dispersion, an amide fatty acid, a polyamide type such as a long chain polyaminoamide phosphate, a polyethylene type such as a colloidal swelling dispersion of polyethylene oxide, Examples thereof include organic bentonide type materials such as organic acid smectite clay and montmorillonite, inorganic pigments such as aluminum silicate and barium sulfate, and flat pigments that develop viscosity depending on the shape of the pigment.

  The paint form of the matte paint composition of this example may be any of a solvent system, a high solid system, an aqueous system, or a powder system, and may be one-pack type, two-pack type, multi-pack type, or the like. The hue may be light or dark.

  The matting paint composition of this example can further contain a coloring pigment and / or an extender pigment in addition to the matting materials [A] and [B], the resin binder, the curing agent, and the additive.

  The color pigment contained in the matte coating composition of this example is not particularly limited, and examples thereof include azo chelate pigments, insoluble azo pigments, condensed azo pigments, phthalocyanine pigments, indigo pigments, perinone pigments, and perylenes. Organic pigments such as pigments, dioxane pigments, quinacridone pigments, isoindolinone pigments, metal complex pigments, inorganic pigments such as yellow lead, yellow iron oxide, bengara, carbon black, titanium dioxide, etc. It is done.

  As the extender pigment contained in the matte coating composition of this example, the extender exemplified in the matte material [A] can be exemplified. When it is added as an extender pigment without aiming for a matte effect, it may be added at an average particle diameter of 1 to 15 μm and 3 parts by weight or less in 100 parts by weight of the solid content of the coating composition. it can.

  As the pigment contained in the matte coating composition of this example, one or a combination of two or more of coloring pigments and extender pigments can be used.

  The matte paint composition of this example is prepared by kneading and dispersing matte materials [A] and [B] and pigments, resin binders and other components using a sand grinder mill, disperser, etc. It can be obtained by methods well known to those skilled in the art.

  The matte coating composition of this example can be used for various substrates such as plastics, metals, glass, foams and molded articles thereof. Also, the matte paint of this example can be applied on the painted film.

  The substrate is preferably coated with a primer in advance, and can be formed into a coating film by applying the coating composition of this example as a top coating on wet-on-wet and drying it. As a primer, the properties normally required as a primer, that is, adhesion with a base material and a coating film formed from the coating composition of this example, solvent resistance, coating film hardness, etc. are good. There is no particular limitation as long as it exists, and existing ones can be used.

  It does not specifically limit as a method of apply | coating the coating composition of this example to the said base material, For example, spray coating, a roll coater method, etc. can be mentioned, Usually, it can apply to dry film thickness 20-40 micrometers. . It does not specifically limit as said drying and the method of forming a coating film, For example, normal temperature drying, forced drying, normal temperature hardening, baking hardening, etc. can be mentioned. Examples of the baking time include 80 to 150 ° C. and 5 to 30 minutes.

  The base coat, which is the lower layer of the matte clear, may contain a pigment or a brightening agent, or may not contain a pigment or a brightening agent.

  The coating film formed from the coating composition of this example has a 60-degree gloss value of preferably 1 to 60, more preferably 5 to 40. The 60-degree gloss value in the present specification means a specular reflectance at 60 degrees performed in accordance with JIS-K-5400-6.7. When the 60 ° gloss value is less than 1, glossiness due to scratches occurs, whereas when it exceeds 60, the matte feeling is lost.

  The matte paint composition according to the embodiment of the present invention has been described above, and transparent or cloudy paints that do not contain colorants such as color pigments are particularly called matte clear paints, and those that contain colorants are simply matte. This is called paint. In addition, the paint used in the matte paint repair method described below is called a repair paint, and in particular, when this repair paint contains a matte material, it is called a repair matte paint so that the normal painting process Clarify paint used in repair and paint used in repair process.

《How to repair matte paint》
Next, a first embodiment of the matte paint repair method according to the present invention will be described with reference to FIGS.

  The laminated coating film shown in FIG. 1 forms an undercoat film 2 typified by electrodeposition coating on the surface of an object 1 made of a material such as a steel plate. The coating film 3 is formed, and the top coating base coating film 4 is formed on the surface of the intermediate coating film 3, and the above-described matting paint (in particular, the matting clear coating paint) is formed on the surface of the top coating base coating film 4. The matte clear coating film 5 is formed. The undercoat coating film 2 and the intermediate coating film 3 are baked and cured independently, and the topcoat base coating film 4 and the matte clear coating film 5 are baked and cured simultaneously after being applied wet-on-wet.

  Now, as shown in the figure, a repairing method in the case where a foreign matter (so-called shading) 10 adheres to the matte clear coating film 5 will be described.

  In the repair method of this example, as shown in FIG. 2, first, an abrasive such as sandpaper is used to remove the foreign matter 10 that is attached so as to be buried in the matte clear coating film 5 (baked and cured). Have a sharpening process. In this polishing step, the foreign material 10 is removed and the periphery of the removed foreign material 10 is smoothed. This range is called repair part 11 (see FIG. 6).

  Next, as shown in FIG. 3, a matte clear paint 6 of the same type (same composition) as the matte clear paint forming the matte clear coating film 5 is applied to the repair portion 11. This matte clear paint is the same paint as the matte clear paint that forms the matte clear coating film 5, but is particularly referred to as a first repair matte paint 6 because it is used in the repair process.

  That is, the first repair matting paint 6 includes matting materials [A] and [B] having different particle sizes, and the matting material [A] is 1 to 100 parts by weight in the solid content of the coating composition. 20 parts by weight, including 4 to 35 parts by weight of resin beads as matting material [B], and the total of resin beads as matting material [A] and matting material [B] is 10 to 40 parts by weight The matting material [A] is a matting material having an average particle size of 1 to 15 μm, and the matting material [B] is a matting material having an average particle size of 2 to 30 μm. These matting materials [A] , [B] is a paint having a ratio [A] / [B] of 1/20 to 1/2.

  Next, as shown in FIG. 4, the second repair mat paint 7 is applied around the repair portion 11 in a wet-on-wet manner without curing the first repair mat paint 6. The second repair matting paint 7 is a matting paint having a gloss value higher than that of the first repair matting paint 6 applied to the repair section 11, and specifically, a matte paint having an average particle size of 6 μm or less. It is a paint containing material. More specifically, it is a matte clear paint obtained by removing the resin beads which are the matte material [B] having a large particle size from the matte clear paint forming the matte clear coating film.

  This second repair matting paint 7 is applied to the periphery of the repair portion 11 to which the first repair matting paint 6 has been applied. As shown in FIG. 6, the periphery of the repaired portion refers to a circumferential region that partially overlaps the outer edge of the repaired portion 11.

  Furthermore, as shown in FIG. 5, the boundary between the repaired portion 11 and the non-repaired portion, in other words, the portion on which the first repair mat paint 6 and the second repair mat paint 7 are applied, and After applying thinner, which is a solvent for the first repair matting paint 6 and the second repair matting paint 7, to the boundary with the unpainted portion, these first repair matting paint 6 and second The matting paint 7 for repair is baked at the same time under the condition of 80 ° C. × 30 minutes, for example. In addition, the process of coating thinner on the boundary between the repaired part and the non-repaired part is not essential and can be omitted. The coating is not limited to thinner, and any solvent may be used as long as the first repair matting paint 6 and the second repair matting paint 7 are used. For example, the first and second repair matting paints may be water-based paints. If so, paint the border with water.

  By the above repairing process, the glossiness of the repaired part 11 and the periphery of the repaired part and the parts other than the repaired part become uniform, and it is not necessary to polish the periphery of the repaired part, and the time required for the polishing work can be shortened.

  7 to 11 are cross-sectional views of a coating film showing a second embodiment of the matte coating repair method according to the present invention, and the structure of the laminated coating film shown in FIG. 7 is the multilayer coating of the first embodiment described above. Same as membrane.

  However, the matte clear paint is applied in a state in which the foreign matter 10 such as blisters adheres to the topcoat base coating film 4, resulting in a problem that the foreign matter 10 is buried up to the topcoat base coating film 4 as shown in FIG. It is.

  In the repair method of this example, as shown in FIG. 8, in order to remove the foreign material 10 embedded in the topcoat base coating film, there is a step of sharpening with an abrasive such as sandpaper. In this example, since the foreign matter 10 reaches the top coat base coating 4, not only the matte clear coating film 5 but also a part of the top coat base coat 4 is sharpened to remove the foreign matter 10 and remove the foreign matter removed. Smooth around 10.

  Next, as shown in FIG. 9, the top coat base coating 9 is applied to the repair portion 11 with the same type (same composition) as the top coat base paint that forms the top coat base coating 4. Furthermore, as shown in the figure, the same type (same composition) as the matte clear paint for forming the matte clear coating film 5 on the top coat base paint 9 of the repair portion 11 in a wet-on-wet manner. Apply matte clear paint 6.

  The matte clear paint 6 is the same paint as the matte clear paint that forms the matte clear coating film 5, but is particularly referred to as the first repair matte paint 6 because it is used in the repair process.

  That is, the first repair matting paint 6 includes matting materials [A] and [B] having different particle sizes, and the matting material [A] is 1 to 100 parts by weight in the solid content of the coating composition. 20 parts by weight, including 4 to 35 parts by weight of resin beads as matting material [B], and the total of resin beads as matting material [A] and matting material [B] is 10 to 40 parts by weight The matting material [A] is a matting material having an average particle size of 1 to 15 μm, and the matting material [B] is a matting material having an average particle size of 2 to 30 μm. These matting materials [A] , [B] is a paint having a ratio [A] / [B] of 1/20 to 1/2.

  Next, as shown in FIG. 10, the second base matte paint 7 around the repair portion 11 is wet-on-wet without curing the top coat base paint 9 and the first repair matte paint 6. Paint. This second repair matting paint 7 is a matting paint having a gloss value higher than that of the first repair matting paint 6 applied to the repair section 11, and specifically, a matte paint having an average particle size of less than 6 μm. It is a paint containing material. More specifically, it is a matte clear paint obtained by removing the resin beads which are the matte material [B] having a large particle size from the matte clear paint forming the matte clear coating film.

  This second repair matting paint 7 is applied to the periphery of the repair portion 11 to which the first repair matting paint 6 has been applied. Also in this example, the periphery of the repair portion refers to a circumferential region that partially overlaps the outer edge of the repair portion 11 shown in FIG.

  Furthermore, as shown in FIG. 11, the boundary part between the repaired part 11 and the non-repaired part, in other words, the part coated with the first repair matting paint 6 and the second repair matting paint 7, After applying thinner, which is the solvent of the first repair matting paint 6 and the second repair matting paint 7, to the boundary with the unpainted portion, these top coat base paint 9 and the first repair matting The paint 6 and the second repair mat paint 7 are simultaneously baked under the condition of 80 ° C. × 30 minutes, for example. In addition, the process of coating thinner on the boundary between the repaired part and the non-repaired part is not essential and can be omitted. The coating is not limited to thinner, and any solvent may be used as long as the first repair matting paint 6 and the second repair matting paint 7 are used. For example, the first and second repair matting paints may be water-based paints. If so, paint the border with water.

  By the above repairing process, the glossiness of the repaired part 11 and the periphery of the repaired part and the parts other than the repaired part become uniform, and it is not necessary to polish the periphery of the repaired part, and the time required for the polishing work can be shortened.

  Table 1 shows the performance test results of the matte clear coating film, and FIGS. 1 and 2 show the matte paint repair method of the present invention.

《Preparation of coated plate》
The coated plates of Examples 1 to 10 and Comparative Examples 1 to 6 were produced as follows.

  First, a cation electrodeposition paint (cation type electrodeposition paint Power Top U600M manufactured by Nippon Paint Co., Ltd.) is applied to a 0.8 mm thick, 70 mm × 150 mm thick steel plate treated with zinc phosphate so that the dry film thickness is 20 μm. After electrodeposition coating, it was baked at 160 ° C. for 30 minutes. Thereafter, a gray intermediate coating (High Epico No. 560 manufactured by Nippon Oil & Fats Co., Ltd.) was applied at 30 μm and baked at 140 ° C. for 30 minutes.

  Next, a laminated coating film composed of a first layer (basecoat coating film layer) and a second layer (matte clear coating film layer) was formed. The first layer is spray-coated with a solvent-type black paint (Nippon Yushi Co., Ltd., two-component urethane paint, high urethane No. 7000) so that the dry film thickness is 10 μm, and the second layer is a solvent-type matte clear paint (Nippon Synthetic Chemical Industry Gosseplen A-1001 mixed with Sumitomo Bayer Urethane isocyanate / Sumidule N75 at 100/30) was spray-coated wet-on-wet so that the dry film thickness was 30 μm. Then, baking was performed at 80 ° C. for 30 minutes.

  In addition, the average particle diameter of the matte material [A] and the average of the matte material [B] contained in the solvent-type matte clear paint constituting the second layer in each of Examples 1 to 10 and Comparative Examples 1 to 6 Table 1 shows the particle sizes and the contents of the matte materials [A] and [B].

《Repair method》
About each coating board of Examples 1-10 produced as mentioned above and Comparative Examples 1-6, the repair method which concerns on 1st Embodiment shown in FIGS. 1-5, and the 1st shown in FIGS. Repair was performed using the repair method according to the second embodiment. The first repair matte paint used at that time is the same paint as the previously applied matte clear paint, and the average particle size of the matte material [A] and the average particle size of the matte material [B] Table 1 shows the contents of the matting materials [A] and [B].

  Table 1 shows the average particle size of the matting material contained in the second repair matting paint and the content of the matting material.

<Film performance>
The glossiness of the coating film (before repair) of the obtained coated plate is evaluated by evaluating the non-repaired portion with a glossiness of 60 degrees using a gloss meter. 80 is Δ and 80 or more is X.

In addition, the difference in glossiness between the repaired part and the non-repaired part after repair is visually evaluated. When there is no difference in glossiness, ○, when there is almost no difference in glossiness, When there was, it was set as x. These results are shown in Table 1.

  As is clear from this result, the difference in glossiness between the repaired part and the non-repaired part in Examples 1 to 10 is better than those in Comparative Examples 1 to 6.

  The embodiment described above is described in order to facilitate understanding of the present invention, and is not described in order to limit the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a coating film (before repair) showing a first embodiment of a matte paint repair method according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a coating cross-sectional view (polishing step) showing a first embodiment of a matte paint repair method according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a coating film showing a first embodiment of a matte paint repair method according to the present invention (first matte paint coating process for repair). BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a coating film showing a first embodiment of a matte paint repair method according to the present invention (second matte paint coating process for repair). BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a coating film (thinner coating process) showing a first embodiment of a matte coating repair method according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a coating film showing a first embodiment of a matte paint repair method according to the present invention, showing a repair portion, a periphery of the repair portion, and a boundary between the repair portion and the non-repair portion. It is coating-film sectional drawing (before repair) which shows 2nd Embodiment of the repair method of the matte painting which concerns on this invention. It is coating film sectional drawing (polishing process) which shows 2nd Embodiment of the repair method of the matte painting which concerns on this invention. FIG. 5 is a cross-sectional view of a coating film showing a second embodiment of the matte coating repair method according to the present invention (top coat base paint coating process, first repair mat paint coating process). It is coating-film sectional drawing (the matte paint coating process for 2nd repair) which shows 2nd Embodiment of the repair method of the matte painting which concerns on this invention. It is coating film sectional drawing (thinner coating process) which shows 2nd Embodiment of the repair method of the matte painting which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... To-be-coated object 2 ... Undercoat film 3 ... Intermediate coat film 4 ... Top coat base film 5 ... Matte clear paint film 6 ... First repair mat paint 7 ... Second repair mat paint 8 ... Thinner 9 ... Topcoat base paint 10 ... Foreign matter 11 ... Repair part

Claims (8)

A coating composition comprising particulate matting materials [A] and [B] having different average particle diameters, wherein the matting material [A] is added in an amount of 1 to 20 weights in 100 parts by weight of the solid content of the coating composition. Part, 4 to 35 parts by weight of the matting material [B], and the matting material [A] and the matting material [B] are 10 to 40 parts by weight in total. . The matting material [A] has an average particle size of 1 to 15 μm, the matting material [B] has an average particle size of 2 to 30 μm, and the matting materials [A] and [B] have an average particle size of The matte paint according to claim 1, wherein the ratio [A] / [B] is 1/20 to 1/2. A step of sharpening a repaired part of the matte coating film formed by applying the matte paint according to claim 1 or 2, and a first repairing material having substantially the same composition as the matte clear paint in the repaired part. A step of applying a matte paint, a step of applying a second repair matte paint having a gloss value higher than that of the first repair matte around the repair portion, and a painted first repair matte And a step of baking the paint and the second repair mat paint. A step of sharpening a repaired portion of a matte paint film formed by applying the matte paint according to claim 1 on the basecoat paint previously applied, and the basecoat paint is applied to the repaired portion A step of applying a first matting paint for repair having substantially the same composition as the matte paint on the painted base coat paint, and the first matting paint for repair around the repair portion. A step of applying a matte paint for second repair having a higher gloss value and a step of baking the matte paint for base coating, the first matte paint for repair and the matte paint for second repair. How to repair matte paint. The matte paint repair method according to claim 3 or 4, wherein the second repair matte paint includes a matte material having an average particle size of less than 6 µm. The matte paint repair method according to claim 3, wherein the base coat paint or the matte paint contains a color pigment and / or a bright material. The matte coating repair method according to any one of claims 3 to 6, wherein, in the baking step, baking is performed after a solvent is applied to a boundary portion between the repaired portion and the non-repaired portion. A matte paint film, which is formed by applying the matte paint according to claim 1 or 2.

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