Painting method for easily peelable paints

Abstract

To provide a coating method of easily peelable coating material capable of uniformizing adhesion force between a coating surface and a peelable coating film composed of the easily peelable coating material.SOLUTION: A coating method of easily peelable coating material comprises: a normal automobile coating step S1 for forming an electrodeposition layer, an intermediate coating layer, a base layer, and a clear layer on an object to be coated; a polishing step S2 for polishing a coating surface by using an abrasive so as to form uniform unevenness on the coating surface of the object to be coated; a degreasing step S3 for degreasing the polished coating surface; and a coating step S4 for coating the polished coating surface with the easily peelable coating material.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a method for applying an easily peelable paint.

Background Art

[0002] Conventionally, in such a technical field, for example, there is one described in Patent Document 1. In Patent Document 1, an undercoat layer made of an easily peelable paint is provided between the object to be painted and a highly durable paint, and by utilizing the peelable function of the undercoat layer, a paint film layer made of an easily peelable paint and a highly durable paint can be easily peeled off as needed, and a painting method that enables easy repainting is disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the peelable paint film formed by applying an easily peelable paint to the painted surface of the object to be painted has a varying adhesion to the painted surface depending on the substrate, so the adhesion between the painted surface and the peelable paint film tends to be non-uniform. When the adhesion becomes non-uniform, there will be areas where it is easy to peel or difficult to peel, leading to the problem that the peelable paint film cannot be easily peeled off.

[0005] The present invention has been made to solve such technical problems, and an object thereof is to provide a method for applying an easily peelable paint that makes the adhesion between the painted surface and a peelable paint film made of an easily peelable paint uniform.

Means for Solving the Problems

[0006] The present invention relates to a method for applying an easily peelable coating, characterized by comprising: a polishing step of polishing the painted surface of an object to be coated using an abrasive to form uniform irregularities on the painted surface; and a coating step of applying an easily peelable coating to the polished painted surface.

[0007] In the coating method for easily peelable paint according to the present invention, before applying the easily peelable paint, the surface of the object to be coated is polished with an abrasive to form uniform irregularities on the surface, thereby creating uniform irregularities on the surface. When the easily peelable paint is then applied to the polished surface, the irregularities formed on the surface exert an anchoring effect, thereby ensuring adhesion between the painted surface and the peelable coating made of the easily peelable paint. In addition, because the irregularities are uniform, the adhesion between the painted surface and the peelable coating can be made uniform. Furthermore, even if the painted surface of the object to be coated has uneven irregularities, the irregularities can be made uniform by polishing, so the adhesion between the painted surface and the peelable coating can be maintained uniformly.

[0008] In the painting method for easily peelable paint according to the present invention, in the polishing step, it is preferable to polish the painted surface using a polishing device supplied with an abrasive, or to wipe the painted surface using a cloth-like member supplied with fine abrasive particles. The polishing method using a polishing device supplied with an abrasive is suitable for polishing painted surfaces with relatively rough irregularities (for example, the painted surface of a used car). On the other hand, the polishing method using a cloth-like member supplied with fine abrasive particles is suitable for forming uniform irregularities on a smooth painted surface without irregularities (for example, the painted surface of a new car). In this way, by using or combining these polishing methods according to the state of the irregularities of the painted surface, uniform irregularities can be easily formed on the painted surface.

[0009] In the method for applying an easily peelable coating according to the present invention, the object to be coated is a metal plate, and it is preferable to perform an electrodeposition step, an intermediate coating step, a base coating step, and a clear coating step on the object to be coated before the polishing step. This enhances the rust prevention ability of the object to be coated and improves the adhesion between the coated surface and the peelable coating film.

[0010] Furthermore, in the method for applying easily peelable paint according to the present invention, the object to be painted is a resin part, and it is preferable to perform a primer application step, a base coat application step, and a clear coat application step on the object to be painted before the polishing step. This improves the adhesion between the painted surface and the peelable paint film. [Effects of the Invention]

[0011] According to the present invention, the adhesion between the painted surface and the peelable coating made of easily peelable paint can be made uniform. [Brief explanation of the drawing]

[0012] [Figure 1] This is a perspective view showing the structure of a vehicle to which an easily peelable paint coating method is applied. [Figure 2] This is a schematic cross-sectional view showing the hood panel and the peelable coating formed on the hood panel. [Figure 3] This is a schematic cross-sectional view showing the front bumper cover and the peelable coating formed on the front bumper cover. [Figure 4] This is a flowchart showing a method for applying an easily peelable coating according to an embodiment. [Figure 5] This is a schematic diagram illustrating the effectiveness of a painting method using easily peelable paint. [Figure 6] This figure shows the results for Examples 1 and 2 and Comparative Example 1. [Figure 7] This figure shows the results for Examples 3 and 4 and Comparative Example 2. [Modes for carrying out the invention]

[0013] Hereinafter, embodiments of the coating method for easily peelable paint according to the present invention will be described with reference to the drawings.

[0014] The painting method for easily peelable paint according to this embodiment is applicable to the painting of vehicles such as passenger cars, trucks, buses, and railway vehicles, and is a method for forming a peelable coating that suits the needs of repainting or redecorating vehicles. The following explanation will use a passenger car as an example, but the painting method according to this embodiment is not limited to passenger cars.

[0015] Figure 1 is a perspective view showing the structure of a vehicle (passenger car) to which an easily peelable paint coating method is applied. As shown in Figure 1, vehicle 1 is equipped with multiple exterior panels and exterior parts. Here, exterior panels refer to the members that make up the body of vehicle 1 and are visible from the outside (in other words, visible from the outside of the vehicle), and include, for example, a hood panel 10, a roof panel 11, a trunk lid 12, a front fender panel 13, a rear fender panel 14, a front door outer 15, a rear door outer 16, a front pillar 17, a center pillar 18, a rear pillar 19, etc. The material of the exterior panels is, for example, a metal sheet, specifically a hot-rolled steel sheet or a cold-rolled steel sheet.

[0016] On the other hand, the exterior parts of vehicle 1 refer to fitting parts that are assembled to the vehicle body and are visible from the outside, and include, for example, a front bumper cover 20, a rear bumper cover 21, a rocker panel molding 22, a door handle 23, a fuel filler cap cover 24, a side mirror 25, a shark fin (not shown), a roof molding (not shown), etc. As the material for the exterior parts, resin materials are mainly used, but the fuel filler cap cover 24 may be made of steel plate.

[0017] The above outer panel and exterior parts are each formed with a peelable coating film 30. More specifically, at least the outer surface of the outer panel and at least the outer surface of the exterior parts are each provided with a peelable coating film 30 formed by applying an easily peelable paint. Preferably, in addition to the outer surface, the side end surfaces of the outer panel and the exterior parts are each provided with a peelable coating film 30 formed by applying an easily peelable paint. More preferably, in addition to the outer surface and the side end surfaces, a part of the back surface of the outer panel and a part of the back surface of the exterior parts are each provided with a peelable coating film 30 formed by applying an easily peelable paint.

[0018] In this embodiment, the outer panel and the exterior parts of the vehicle correspond to the "coated object" described in the claims.

[0019] Hereinafter, the peelable coating film 30 formed on the outer panel will be described with reference to FIG. 2. Here, an example of the hood panel 10 will be given as the outer panel for explanation.

[0020] FIG. 2 is a schematic cross-sectional view showing the hood panel and the peelable coating film formed on the hood panel. In FIG. 2, the upper side with respect to the paper surface is the front side (also referred to as the outer side) of the hood panel 10, and the lower side is the back side (also referred to as the inner side) of the hood panel 10. As shown in FIG. 2, the hood panel 10 has a steel plate 101, an electrodeposition layer 102 formed so as to cover the entire steel plate 101, and an intermediate coating layer 103, a base layer 104, and a clear layer 105 formed in this order on the front side of the hood panel 10 above the electrodeposition layer 102. The base layer 104 and the clear layer 105 constitute the topcoat layer. In this embodiment, "layer" and "coating film" have the same meaning. Therefore, for example, "electrodeposition layer" has the same meaning as "electrodeposition coating film".

[0021] Furthermore, a peelable coating 30 is formed on the entire outer surface and side end surfaces of the hood panel 10, as well as a portion of the back surface. Specifically, the peelable coating 30 is formed to cover the entire outer surface of the clear layer 105, the electrodeposition layer 102, the intermediate coating layer 103, the base layer 104, the side end surfaces of the clear layer 105, and a portion of the back surface of the electrodeposition layer 102. As described above, this peelable coating 30 is formed by applying an easily peelable paint, and therefore has the property of being peelable compared to a normal coating consisting of the electrodeposition layer 102, the intermediate coating layer 103, the base layer 104, and the clear layer 105.

[0022] Furthermore, a base layer and a clear layer, or just a clear layer, may be formed on the outside of the peelable coating 30. Forming a clear layer enhances the weather resistance and chemical resistance of the peelable coating 30, and also further enhances its gloss and luxurious appearance. In addition, forming a base layer increases the range of available colors.

[0023] Next, with reference to Figure 3, we will explain the peelable coating 30 formed on the exterior parts. Here, we will use a front bumper cover 20 as an example of an exterior part.

[0024] Figure 3 is a schematic cross-sectional view showing the front bumper cover and the peelable coating formed on the front bumper cover. In Figure 3, the upper side with respect to the plane of the paper is the front side (also called the outside) of the front bumper cover 20, and the lower side is the back side (also called the inside) of the front bumper cover 20. The front bumper cover 20 has a resin member 201 integrally molded in the shape of a bumper, and a primer layer 202, a base layer 203, and a clear layer 204 formed sequentially on the resin member 201.

[0025] Furthermore, a peelable coating 30 is formed on the entire outer surface and side end surfaces of the front bumper cover 20, as well as a portion of the back surface. Specifically, the peelable coating 30 is formed to cover the entire outer surface of the clear layer 204. As described above, this peelable coating 30 is formed by applying an easily peelable paint, and therefore has the property of being peelable compared to a normal coating consisting of a primer layer 202, a base layer 203, and a clear layer 204. A clear layer may be further formed on the outside of the peelable coating 30.

[0026] The painting method for the easily peelable paint according to this embodiment will be described below with reference to Figure 4. As shown in Figure 4, the painting method for the easily peelable paint mainly includes a normal vehicle painting step S1, a polishing step S2, a degreasing step S3, and a painting step S4 for the easily peelable paint.

[0027] When the object to be painted is a metal exterior panel, the normal vehicle painting process S1 involves performing an electrodeposition process, an intermediate coating process, a base coating process, and a clear coating process on the exterior panel to sequentially form an electrodeposition layer, an intermediate coating layer, a base layer, and a clear coating layer. For example, when the object to be painted is a hood panel 10, as shown in Figure 2 above, the painting process involves sequentially forming an electrodeposition layer 102, an intermediate coating layer 103, a base layer 104, and a clear layer 105 on the front surface of the steel plate 101 of the hood panel 10.

[0028] On the other hand, when the object to be painted is a resin exterior part, in the normal vehicle painting process S1, a primer application process, a base coat application process, and a clear coat application process are performed on the exterior part to sequentially form a primer layer, a base layer, and a clear coat layer on the exterior part. For example, when the object to be painted is a front bumper cover 20, as shown in Figure 3 above, a primer layer 202, a base layer 203, and a clear coat 204 are sequentially formed on the front surface of the resin member 201 of the front bumper cover 20.

[0029] In the polishing process S2, which follows the normal vehicle painting process S1, the painted surface of the object to be painted is polished using an abrasive to form uniform irregularities on the painted surface. If the object to be painted is the hood panel 10, then the electrodeposition layer 102, the intermediate layer 103, the base layer 104, and the clear layer 105 are formed on the hood panel 10, so the outer surface of the clear layer 105 becomes the painted surface of the hood panel 10. On the other hand, if the object to be painted is the front bumper cover 20, then the primer layer 202, the base layer 203, and the clear layer 204 are formed on the front bumper cover 20, so the outer surface of the clear layer 204 becomes the painted surface of the front bumper cover 20.

[0030] In polishing step S2, the painted surface is polished using a polishing device supplied with an abrasive, or the painted surface is wiped with a cloth-like material supplied with fine abrasive particles. For example, when polishing the painted surface of the hood panel 10 or the painted surface of the front bumper cover 20, a polishing device supplied with an abrasive may be used, a cloth-like material supplied with fine abrasive particles may be used, or both may be used in combination.

[0031] Polishing equipment includes, for example, a polisher or sander equipped with a sponge buff. In this case, after applying polishing compound to the sponge buff, the sponge buff is pressed against the painted surface of the hood panel 10 (more specifically, the outer surface of the clear layer 105) or the painted surface of the front bumper cover 20 (more specifically, the outer surface of the clear layer 204) while the polisher or sander is rotated at high speed, thereby creating a uniform uneven surface on the outer surface of the clear layer 105 or the clear layer 204.

[0032] After buffing, the polished painted surface is wiped with a cloth such as a microfiber cloth. This process is repeated as needed. The particle size of the abrasive used here is preferably, for example, 0.2 μm to 50 μm.

[0033] On the other hand, the cloth-like material is, for example, a rag used for wiping off oil. The rag is preferably a microfiber cloth. In this case, after applying base polish (fine particle abrasive) to a damp rag, the painted surface of the hood panel 10 (more specifically, the outer surface of the clear layer 105) or the painted surface of the front bumper cover 20 (more specifically, the outer surface of the clear layer 204) is wiped. After that, any excess base polish remaining on the painted surface is wiped off with a dry cloth. This process is repeated as needed. The particle size of the fine particle abrasive used here is preferably, for example, 0.1 μm to 1.5 μm.

[0034] In the degreasing step S3 following the polishing step S2, the polished painted surface is degreased. The degreasing treatment may be, for example, a commonly used solvent degreasing method. Note that the degreasing step is not always necessary, and the painting step of the easily peelable paint may be performed directly after the polishing step.

[0035] In the painting process S4 of the easily peelable paint, which follows the degreasing process S3, a peelable paint film 30 is formed by applying the easily peelable paint to the polished painted surface. For example, the above-mentioned peelable paint film 30 is formed by applying the easily peelable paint to the painted surface of the hood panel 10 (more specifically, the outer surface of the clear layer 105) or the painted surface of the front bumper cover 20 (more specifically, the outer surface of the clear layer 204) by spraying.

[0036] Easy-peel paints are paints that have the property of being easily removed from the painted surface compared to paints used for ordinary vehicle painting. Easy-peel paints are not particularly limited, but solvent-based or water-based paints containing resin components are used. Known resins include acrylic resins, polyester resins, alkyd resins, epoxy resins, and polyurethane resins.

[0037] Furthermore, easily peelable paints may contain pigment components. The pigments are not particularly limited and include ordinary coloring pigments and metallic pigments. Examples of coloring pigments include titanium dioxide, zinc oxide, basic lead sulfate, calcium leadate, zinc phosphate, aluminum phosphate, zinc molybdate, calcium molybdate, Prussian blue, ultramarine, cobalt blue, copper phthalocyanine blue, indanthron blue, lead yellow, synthetic yellow iron oxide, transparent red iron oxide (yellow), bismuth vanadate, titanium yellow, zinc yellow, strontium chromate, lead cyanamide, monoazo yellow, disazo, isoindolinone yellow, metal complex azo yellow, quinophthalone yellow, and isoindolinone yellow. Examples of pigments include yellow, benzimidazolon yellow, red iron oxide, clear red iron oxide, red lead, monoazo red, unsubstituted quinacridone red, azo lake (Mn salt), quinacridone magenta, ancencelon orange, dianthaquinonyl red, perylene maroon, perylene red, diketopyrrolopyrrole chromium vermilion, basic lead chromate, chromium oxide, chlorinated phthalocyanine green, brominated phthalocyanine green, pyrazolone orange, benzimidazolon orange, dioxazine violet, and perylene violet. Metallic pigments include, for example, aluminum powder, flake aluminum oxide, pearl mica, and flake mica. These pigments can be used individually or in combination of two or more.

[0038] In the coating method for easily peelable paint according to this embodiment, a polishing step S2 is performed after the normal vehicle painting step S1 to form uniform irregularities on the painted surface of the vehicle. When the easily peelable paint is applied to the painted surface in the subsequent easily peelable paint coating step S4, the irregularities formed on the painted surface exert an anchoring effect, thereby ensuring adhesion between the painted surface and the peelable coating 30 made of easily peelable paint. In addition, because the irregularities are uniform, the adhesion between the painted surface and the peelable coating 30 can be made uniform.

[0039] For example, as shown in the upper part of Figure 5, a vehicle painted in a normal vehicle painting process S1 (referred to here as a new car) has a smooth surface without irregularities (i.e., a painted surface). If an easily peelable paint is directly applied to this smooth painted surface, the adhesion between the painted surface and the peelable paint film 30 formed on the painted surface will be low, and it may not be possible to secure the required adhesion. However, by lightly roughening the smooth painted surface by polishing to create irregularities, the irregularities will exert an anchoring effect, increasing the adhesion between the painted surface and the peelable paint film 30. Moreover, by creating uniform irregularities on the painted surface by polishing, the adhesion between the painted surface and the peelable paint film 30 can be maintained uniformly.

[0040] Furthermore, as shown in the lower part of Figure 5, in the case of a vehicle that has been painted using the normal vehicle painting process S1 and used for a certain period of time (referred to here as a used vehicle), irregularities are formed on the outer surface of the vehicle (i.e., the painted surface) due to use, and these irregularities are uneven. The anchoring effect due to the uneven irregularities is large, and the adhesion between the painted surface and the peelable paint film 30 is high, but it may become difficult to peel off the peelable paint film 30. Therefore, in the case of a used vehicle, the adhesion between the painted surface and the peelable paint film 30 is reduced by smoothing out the irregularities by polishing before applying the easily peelable paint. In this way, even if the painted surface of the object to be painted has uneven irregularities, the adhesion between the painted surface and the peelable paint film can be made uniform by polishing the painted surface to form uniform irregularities.

[0041] Furthermore, in polishing step S2, the painted surface is polished using a polishing device supplied with an abrasive, or the painted surface is wiped using a cloth-like material supplied with fine abrasive particles. The polishing method using a polishing device supplied with an abrasive is suitable for polishing painted surfaces with relatively rough irregularities (e.g., the painted surface of a used car). On the other hand, the polishing method using a cloth-like material supplied with fine abrasive particles is suitable for forming uniform irregularities on a smooth painted surface (e.g., the painted surface of a new car). In this way, by using or combining these polishing methods based on the irregularity of the painted surface, uniform irregularities can be easily formed on the painted surface.

[0042] Furthermore, since a degreasing step S3 is included between the polishing step S2 and the painting step S4 of the easily peelable paint, oil and grease adhering to the painted surface can be removed, and any remaining abrasive material after the polishing step S2 can also be removed. This suppresses the impact of residual oil and abrasive material on the paint.

[0043] Furthermore, by performing a standard vehicle painting process, which includes an electrodeposition process, an intermediate coating process, and a top coating process, on the metal object to be painted before the polishing process S2, the rust prevention ability of the object to be painted can be enhanced, and the adhesion between the painted surface and the peelable coating 30 can be improved.

[0044] [Examples and Comparative Examples] The inventors of the present invention conducted the following examples and comparative examples to verify the effectiveness of the coating method for easily peelable paint according to the present embodiment.

[0045] First, the inventors of the present invention prepared several samples of hot-rolled steel sheets used as the exterior panels of a vehicle, which were then painted with a normal vehicle paint (i.e., exterior panels painted in the normal vehicle painting process S1 described above). They formed three such groups: a new sample (hereinafter referred to as "initial product"), a new sample with scratches on the paint film (hereinafter referred to as "scratched product"), and a new sample that had been weather-degraded for one week (by ultraviolet irradiation) (hereinafter referred to as "weather-degraded product").

[0046] [Comparative Example 1] Next, for one of the three groups mentioned above, without polishing the surface (painted surface) of the paint film formed by normal vehicle painting, an easily peelable paint film was applied to the painted surface as described in the easily peelable paint application process S4. In other words, an easily peelable paint film was formed by directly applying the easily peelable paint to the painted surfaces of the initial product, the damaged product, and the weather-deteriorated product belonging to this group.

[0047] [Example 1] Furthermore, for one of the three groups mentioned above, the surface of the paint film formed by normal vehicle painting was polished using a cloth-like member supplied with fine abrasive particles, and then, as described in the painting process S4 for easily peelable paint, an easily peelable paint was applied to the painted surface to form a peelable paint film. That is, the painted surfaces of the initial product, the damaged product, and the weather-degraded product belonging to this group were polished using a cloth-like member supplied with fine abrasive particles, and then, an easily peelable paint was applied to the polished painted surface to form a peelable paint film.

[0048] [Example 2] Furthermore, for one of the three groups mentioned above, the surface of the paint film formed by normal vehicle painting was polished using a polishing device supplied with an abrasive, and then, as described in the painting process S4 for easily peelable paint, an easily peelable paint film was applied to form a peelable paint film. That is, the painted surfaces of the initial product, the damaged product, and the weather-degraded product belonging to this group were polished using a polishing device supplied with an abrasive, and then, an easily peelable paint film was applied to the polished painted surface to form a peelable paint film.

[0049] Next, the adhesion strength between the painted surface and the peelable coating was measured and compared for each sample from the three groups mentioned above. The adhesion strength was measured using a 180° peel test in accordance with JIS Z 0237 "Test Methods for Adhesive Tapes and Adhesive Sheets". More specifically, a cut of a certain width (10 mm in this case) was made in the peelable coating of each sample, and the ends were clamped in a tensile testing machine. The strength at which the peelable coating was pulled off was measured. The adhesion strength here is also called peel strength or peel strength.

[0050] Figure 6 shows the results for Examples 1 and 2 and Comparative Example 1. As shown in Figure 6, it was found that there was less variation in the adhesion force between the painted surface and the peelable coating in Examples 1 and 2 compared to Comparative Example 1. In other words, even if the condition of the painted surface differs between the initial product, the scratched product, and the weather-degraded product, a uniform surface can be obtained by polishing with a cloth-like material or polishing with a polishing device, thereby making the adhesion force between the painted surface and the peelable coating uniform. Furthermore, the adhesion force between the painted surface and the peelable coating is preferably 0.5N / 10mm to 15N / 10mm, and more preferably 1N / 10mm to 10N / 10mm.

[0051] Furthermore, the inventors of the present invention prepared multiple samples of vehicle hood panels with normal vehicle paint applied (i.e., hood panels painted in the normal vehicle painting process S1 described above), and grouped them into three sets: a new sample (hereinafter referred to as "initial product"), a new sample exposed to the natural environment of Okinawa for a period equivalent to 2 years (hereinafter referred to as "Okinawa-exposed product"), and a new sample subjected to accelerated testing for a period equivalent to 10 years (hereinafter referred to as "accelerated test product"). The accelerated testing was conducted in accordance with JIS K 5600-7-7 "Long-term durability of coatings - Accelerated weathering resistance".

[0052] [Comparative Example 2] Next, for one of the three groups mentioned above, without polishing the surface (painted surface) of the paint film formed by normal vehicle painting, an easily peelable paint film was applied to the painted surface as described in the easily peelable paint application process S4, thereby forming a peelable paint film. That is, an easily peelable paint film was formed by directly applying an easily peelable paint to the painted surfaces of the initial product, the Okinawa exposed product, and the accelerated test product belonging to this group.

[0053] [Example 3] Furthermore, for one of the three groups mentioned above, the surface of the paint film formed by normal vehicle painting was polished using a cloth-like member supplied with fine abrasive particles, and then, as described in the painting process S4 for easily peelable paint, an easily peelable paint was applied to the painted surface to form a peelable paint film. That is, the painted surfaces of the initial product, the Okinawa exposure product, and the accelerated test product belonging to this group were polished using a cloth-like member supplied with fine abrasive particles, and then, an easily peelable paint was applied to the polished painted surface to form a peelable paint film.

[0054] [Example 4] Furthermore, for one of the three groups mentioned above, the surface of the paint film formed by normal vehicle painting was polished using a polishing device supplied with an abrasive, and then, as described in the painting process S4 for easily peelable paint, an easily peelable paint was applied to the painted surface to form a peelable paint film. That is, the painted surfaces of the initial product, the Okinawa exposure product, and the accelerated test product belonging to this group were polished using a polishing device supplied with an abrasive, and then, an easily peelable paint was applied to the polished painted surface to form a peelable paint film.

[0055] Next, for each of the three groups of samples mentioned above, the adhesion between the painted surface and the peelable coating was measured and compared, as described above.

[0056] Figure 7 shows the results for Examples 3 and 4 and Comparative Example 2. As shown in Figure 7, it was found that there was less variation in the adhesion between the painted surface and the peelable coating in Examples 3 and 4 compared to Comparative Example 2. In other words, even if the condition of the painted surface differs between the initial sample, the Okinawa exposure sample, and the accelerated test sample, uniform irregularities can be obtained by polishing with a cloth-like material or polishing with a polishing device, thereby enabling uniform adhesion between the painted surface and the peelable coating.

[0057] Although embodiments of the present invention have been described in detail above, the present invention is not limited to the embodiments described above, and various design modifications can be made without departing from the spirit of the invention as described in the claims. [Explanation of Symbols]

[0058] 1: Vehicle, 10: Hood panel, 11: Roof panel, 12: Trunk lid, 13: Front fender panel, 20: Front bumper cover, 21: Rear bumper cover, 30: Peelable coating, 101: Steel plate, 102: Electrodeposition layer, 103: Intermediate coating layer, 104: Base layer, 105: Clear layer, 201: Resin component, 202: Primer layer, 203: Base layer, 204: Clear layer

Claims

1. A method for applying easily peelable paint, A polishing step in which the painted surface of an object to be painted, having at least an undercoat layer, a base layer, and a clear layer, is polished using an abrasive to form uniform irregularities on the painted surface, A painting step of applying an easily peelable paint to the polished painted surface, Includes, A method for applying an easily peelable paint, comprising the polishing step of wiping the painted surface with a cloth-like member supplied with a fine abrasive having particle size of 0.1 μm to 1.5 μm.

2. The object to be painted is a metal plate, The method for applying an easily peelable paint according to claim 1, wherein, before the polishing step, an electrodeposition step, an intermediate coating step, a base coating step, and a clear coating step are performed on the object to be coated.

3. The object to be painted is a resin part, The method for applying an easily peelable paint according to claim 1, wherein, before the polishing step, a primer application step, a base coat application step, and a clear coat application step are performed on the object to be painted.

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