Method for forming a peelable coating film

Abstract

To provide a method of forming a peelable coating which can adjust durability of the peelable coating.SOLUTION: This embodiment is a method of forming a peelable coating film on a design surface of at least one component constituting an exterior surface of a vehicle. The method includes a step of coating a peelable coating film so that film thickness of an outer edge portion of the peelable coating film is larger than film thickness of a coating film of another portion.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a method for forming a peelable coating film.

Background Art

[0002] There is a technique for protecting the coating film of a vehicle during transportation from the factory and / or during storage by applying a peelable paint to the surface of the vehicle such as an automobile to form a coating film. The protective coating film can be removed from the vehicle with a high-pressure washer or the like before delivery to the user.

[0003] In addition, the peelable coating film is also used for decorating the appearance of the vehicle. Since the peelable coating film is easier to peel off than general paints, the appearance of the vehicle can be easily changed. For example, the appearance of the vehicle can be decorated by applying a paint for a peelable coating film to the appearance surface of the vehicle and then applying a color base paint and / or a clear paint thereon. Further, when it is desired to change or remove the decoration, it can be easily performed by removing the peelable coating film with a high-pressure washer, an adhesive, or the like.

[0004] For example, Patent Document 1 discloses an appearance protection method for an automobile body that continuously protects the appearance of the automobile body from the assembly process to the delivery to the user after painting, characterized in that a physically peelable protective paint is applied to the coating film surface of the automobile body.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] As described above, the peelable coating film is used for protecting and decorating the exterior surface of a vehicle. Here, the peelable coating film for protection and decoration needs to adhere sufficiently to the surface of the vehicle until the need to intentionally peel it off arises. For example, when cleaning dirt and dust adhering to the surface of the peelable coating film, a high-pressure washer is used. However, the peelable coating film for protection and decoration does not peel off under the water pressure used for general cleaning, and it is desired to have characteristics such that it can be peeled off only when a higher water pressure is applied using a high-performance high-pressure washer for industrial use or the like. That is, it is desirable for the peelable coating film to have appropriate durability such that it does not peel off under low water pressure and peels off under high water pressure, and there is a desire to develop a method for forming a peelable coating film that can be adjusted so that the peelable coating film has such durability.

[0007] Therefore, an object of the present disclosure is to provide a method for forming a peelable coating film that can adjust the durability of the peelable coating film.

Means for Solving the Problem

[0008] The inventors of the present invention earnestly studied to solve the above problems, and as a result, when forming a peelable coating film on the design surface of a component constituting the exterior surface of a vehicle, by forming the peelable coating film such that the film thickness of the outer edge portion of the coating film is larger than the film thickness of the coating film of other portions, it was found that the durability against pressure such as water pressure by a high-pressure washer can be improved, leading to the present disclosure.

[0009] Therefore, an example aspect of the present embodiment is as follows.

[0010] (1) A method for forming a peelable coating film on the design surface of at least one component constituting the exterior surface of a vehicle, the method including a step of applying the peelable coating film such that the film thickness of the outer edge portion of the peelable coating film is larger than the film thickness of the coating film of other portions. A method including a step of applying a peelable coating film such that the film thickness of the outer edge portion of the peelable coating film is larger than the film thickness of the coating film of other portions. (2) The method according to (1), wherein the surface of the component is painted. (3) The method according to (2), wherein the surface of the component is a color base coating film or a clear coating film. (4) The method according to any one of (1) to (3), wherein the outer edge of the peelable coating film is disposed near the end of the design surface of the component. (5) The method according to any one of (1) to (4), further including a step of applying a color base coating film after the step of applying the peelable coating film. (6) The method according to (5), further including a step of applying a clear coating film after the step of applying the color base coating film. (7) The method according to any one of (1) to (4), further including a step of applying a clear coating film after the step of applying the peelable coating film. (8) The method according to any one of (1) to (7), wherein the film thickness of the outer edge of the peelable coating film is 50 μm or more and 300 μm or less. (9) The method according to (8), wherein the film thickness of the outer edge of the peelable coating film is 10 μm or more greater than the film thickness of the coating film in the other part. (10) The method according to (8) or (9), wherein the film thickness of the coating film in the other part is 10 μm or more and 40 μm or less. (11) The method according to any one of (1) to (10), wherein the peelable coating film is formed to decorate the appearance of the vehicle. (12) The method according to any one of (1) to (10), wherein the peelable coating film is formed to protect the outer surface of the vehicle. [Advantages of the Invention]

[0011] According to the present disclosure, a method for forming a peelable coating film capable of adjusting the durability of the peelable coating film can be provided. [Brief Description of the Drawings]

[0012]

Figure 1

Figure 2

Mode for Carrying Out the Invention

[0013] This embodiment is a method of forming a peelable coating film on the design surface of at least one component constituting the outer appearance surface of a vehicle, and includes a step of applying the peelable coating film so that the film thickness of the outer edge portion of the peelable coating film is larger than the film thickness of the coating film of other portions.

[0014] In this embodiment, a peelable coating film is formed such that the film thickness of the coating film at the outer edge portion of the peelable coating film is larger than the film thickness of the coating film at other portions. In this embodiment, by thickening the coating film at the outer edge portion, the durability of the peelable coating film against pressure such as water pressure by a high-pressure washer can be improved. Generally, when water or a solvent is sprayed by a high-pressure washer to peel off a peelable coating film, there is a tendency that the portion between the coating film and the component surface appears and is easily peeled off from the outer edge of the coating film. It is considered that water or a solvent sprayed at a high pressure easily enters the interface between the coating film appearing at the outer edge and the component surface, so there is a tendency that it is easily peeled off from the outer edge of the coating film. Therefore, as a result of intensive studies by the present inventors, it has been found that the durability of the coating film against pressure such as water pressure by a high-pressure washer can be improved by thickening the coating film at the outer edge portion. As a reason for the improvement in durability against pressure such as water pressure by increasing the film thickness of the outer edge portion of the coating film, the following reasons are considered as speculation. As described above, in the peelable coating film, water or a solvent sprayed at the interface between the coating film appearing at the outer edge of the coating film and the component surface tends to enter and be peeled off. When the film thickness of the coating film is thin, deformation or breakage of the coating film is likely to occur, and sprayed water or the like easily enters the above interface. Therefore, when the film thickness of the outer edge portion is increased, the strength of the outer edge portion is improved, and deformation or breakage of the coating film due to sprayed water or the like at the outer edge portion is suppressed. As a result, it is possible to suppress the entry of sprayed water or the like into the above interface. Therefore, it is considered that the durability against pressure such as water pressure can be improved by increasing the film thickness of the outer edge portion. Note that the speculation does not limit this embodiment.

[0015] Hereinafter, this embodiment will be described in detail.

[0016] The forming method according to this embodiment includes a step of applying a peelable coating film such that the film thickness of the outer edge portion of the peelable coating film is larger than the film thickness of the coating film at other portions. In other words, the forming method according to this embodiment includes a step of applying a paint for a peelable coating film such that the film thickness of the outer edge portion of the peelable coating film is larger than the film thickness of the coating film at other portions.

[0017] The peelable coating film is formed for the purpose of adhering to the surface of a component until a predetermined timing for protection or decoration and being peeled off as needed. The peelable coating film is required to adhere sufficiently to the surface of the vehicle until the necessity to intentionally peel it off arises. For example, even when cleaning dirt or dust adhering to the surface of the peelable coating film using a high-pressure washer, it is desired to have durability such that it will not peel off under the water pressure used for general cleaning. On the other hand, when it is to be peeled off, it is desired to be peelable by a high water pressure such as that obtained using a high-performance high-pressure washer for industrial use or the like. Therefore, in the present embodiment, the coating film is formed such that the film thickness of the outer edge portion of the peelable coating film is larger than the film thickness of the coating film in other portions. Thereby, the durability of the coating film can be improved at the outer edge portion that tends to be easily peeled off, and the difficulty of peeling off the entire coating film can be improved.

[0018] The "outer edge portion" of the peelable coating film is a portion along the outer edge of the peelable coating film. In the present embodiment, from the viewpoint of obtaining the durability improvement effect of the present embodiment, it is sufficient that the coating film is thick in at least a part of the outer edge portion. In the present embodiment, from the viewpoint of the durability improvement effect, it is preferable that the outer edge portion where the coating film is thick is arranged in more than half of the outer edge of the peelable coating film. Further, in the present embodiment, from the viewpoint of the durability improvement effect, it is preferable that the outer edge portion where the coating film is thick is arranged in the entire outer edge of the peelable coating film. In other words, in the present embodiment, from the viewpoint of the durability improvement effect, it is preferable that the coating film is thick in the entire outer edge portion of the peelable coating film. In other words, in the present embodiment, it is preferable that the coating film is thick over the entire outer edge of the peelable coating film.

[0019] In the present embodiment, the peelable coating film is formed on the design surface of at least one component constituting the appearance surface of the vehicle. The design surface may be a flat surface or a curved surface.

[0020] As used herein, the "outer appearance surface of a vehicle" means the vehicle surface that is exposed to the outside when all openings such as doors existing on a vehicle such as an automobile are closed. As used herein, the "at least one component constituting the outer appearance surface of a vehicle" means a component at least a part of which is exposed on the outer appearance surface of the vehicle, and the number of components on which a peelable coating film is formed may be one or more. As used herein, the "design surface of a component" means the surface of the component that can be visually recognized from the outside of the vehicle, and can also be referred to as the outer appearance surface of the component.

[0021] The components constituting the outer appearance surface of a vehicle are not particularly limited as long as at least a part of them is exposed on the outer appearance surface of the vehicle. Examples of the components constituting the outer appearance surface of a vehicle include a bonnet, a roof, a fender, a front pillar, a rear pillar, a center pillar, a front door, a rear door, a side panel, a door outside handle, a front bumper, a rear bumper, a tire wheel, a door mirror, a trunk, a quarter panel, an emblem, etc. Generally, a coating film is applied to the surface of the components constituting the outer appearance surface of a vehicle. Also, the surface of the components constituting the outer appearance surface of a vehicle may be a glass member, and examples of the glass member include windshield glass or lighting glass, etc. Also, examples of the windshield glass include front glass, side glass, or rear glass, etc. Examples of the lighting glass include headlight glass, small light glass, turn signal glass, tail light glass, brake light glass, or fog light glass, etc. As described above, in the present embodiment, the number of components on which a peelable coating film is formed may be one or more.

[0022] Examples of parts as objects to be painted include those coated with a metal material (such as an iron plate, a steel plate, aluminum, or stainless steel) or a resin material. For example, when painting, a primer layer is formed on the metal material or resin material, and a color base paint and / or a clear paint are applied on the primer layer. The primer layer is a film of paint or resin and can be formed on the surface of the part by electrodeposition coating. The primer layer has the role of ensuring corrosion resistance and adhesion to the color base paint or clear paint. These coating films are different from the peelable coating films formed in the present embodiment and are not intended to be peeled off in the future. The paint is not particularly limited but usually contains a resin and a curing agent. The resin that is the main component of the coating film is not particularly limited, but an aqueous resin is preferably used. The aqueous resin may be a water-soluble resin that can be dissolved in water or a water-dispersible resin that can be dispersed in water. Examples of the resin contained in the paint include an epoxy resin, an epoxy ester resin, a polyester resin, an acrylic resin (including a methacrylic resin), an acrylic silicone resin, a polyester resin, a polyurethane resin, an alkyd resin, a urethane resin, a vinyl resin, a urea-based resin, styrene-butadiene-latex (SBR), or NBR, etc. The aqueous resin may be used alone or in combination of two or more kinds.

[0023] In the present embodiment, it is preferable to form a peelable coating film on the painted part. The peelable coating film may be formed to protect the painting of the part, or may be formed to decorate the part surface. In one embodiment, a peelable coating film is formed on the color base coating film and / or the clear coating film. Also, in one embodiment, a peelable coating film is formed on the color base coating film. Further, in one embodiment, a peelable coating film is formed on the clear coating film. Examples of the resin used for the clear paint include acrylic resin, polyester resin, alkyd resin, urethane resin, or epoxy resin, etc. The resin may be used alone or in combination of two or more. Also, the clear paint may contain a crosslinking agent. Examples of the crosslinking agent include polyisocyanate, melamine resin, or urea resin, etc. The crosslinking agent may be used alone or in combination of two or more. The clear paint may be, for example, a paint in which a resin, a crosslinking agent, and an additive are dissolved or dispersed in an organic solvent or water. Also, from the viewpoints of transparency or reinforcement, etc., the clear paint preferably contains acrylic resin and / or polyester resin as a binder component.

[0024] In the present embodiment, the outer edge portion of the peelable coating film is preferably disposed near the end of the design surface of the part. By disposing the outer edge portion of the peelable coating film near the end of the design surface of the part, the protection range or the decoration range of the design surface of the part can be widened. In the present embodiment, the outer edge portion of the peelable coating film is preferably disposed in contact with the end of the design surface of the part.

[0025] FIG. 1 is a schematic perspective view showing one form of the present embodiment. The vehicle 100 shown in FIG. 1 has a bonnet 10 that has been painted, and a peelable coating film 1 is applied on the bonnet 10. The peelable coating film 1 has an outer edge portion 1a and an inner portion 1b corresponding to the inside of the outer edge portion, and is formed such that the film thickness of the outer edge portion 1a is larger than the film thickness of the inner portion 1b. Also, the outer edge portion 1a is disposed near the end of the design surface of the bonnet 10, and specifically, the outer edge of the peelable coating film is formed along the end of the design surface of the bonnet 10.

[0026] In FIG. 1, the painted bonnet 10 was taken as an example of a part on which a peelable coating film is applied, but the present embodiment is not limited thereto. For example, a peelable coating film may be applied to at least one part selected from a bonnet, a roof, a fender, a front pillar, a rear pillar, a center pillar, a front door, a rear door, a side panel, a door outside handle, a front bumper, a rear bumper, a tire wheel, a door mirror, a trunk, a quarter panel, and an emblem.

[0027] In the present embodiment, from the viewpoint of effectively improving durability, the outer edge portion where the coating film is thickened is preferably 5 mm or more from the outer edge, and preferably 10 mm or more from the outer edge. Also, from the viewpoint of reducing costs such as the amount of coating film used and labor, the outer edge portion where the coating film is thickened is preferably 50 mm or less from the outer edge, preferably 40 mm or less from the outer edge, and preferably 30 mm or less from the outer edge. The upper limit value and / or the lower limit value of these numerical ranges can define a preferable range by arbitrarily combining them respectively.

[0028] The film thickness of the outer edge portion is preferably 50 μm or more, preferably 55 μm or more, preferably 60 μm or more, preferably 65 μm or more, preferably 70 μm or more, and preferably 75 μm or more. By increasing the film thickness of the outer edge portion, the durability of the coating film against pressure such as water pressure by a high-pressure washer can be improved. Also, the film thickness of the outer edge portion is preferably 300 μm or less, preferably 250 μm or less, preferably 200 μm or less, and preferably 150 μm or less. The upper limit value and / or the lower limit value of these numerical ranges can define a preferable range by arbitrarily combining them respectively.

[0029] The film thickness of the outer edge portion is preferably 10 μm or more, and preferably 20 μm or more, greater than the film thickness of the coating film in the portion other than the outer edge portion.

[0030] The film thickness other than the outer edge portion is preferably 40 μm or less, preferably 35 μm or less, and preferably 30 μm or less. By setting the film thickness other than the outer edge portion within this range, it is possible to facilitate peeling of the coating film after the coating film at the outer edge portion has peeled off, and it is also possible to effectively reduce costs such as the amount of paint used and labor. Further, the film thickness other than the outer edge portion is preferably 10 μm or more, preferably 15 μm or more, and preferably 20 μm or more. By setting the film thickness other than the outer edge portion within this range, the durability of the coating film other than the outer edge portion can be improved. The upper limit value and / or the lower limit value of these numerical ranges can be arbitrarily combined to define a preferable range.

[0031] The paint for the peelable coating film is not particularly limited, and a paint used for forming a coating film intended to be peeled off can be used. The paint for the peelable coating film is, for example, a resin-containing liquid in which at least a resin is dissolved or dispersed in a solvent. Examples of the solvent include water and organic solvents. Specifically, the paint for the peelable coating film is, for example, a resin-containing liquid in which at least a resin is dissolved or dispersed in an organic solvent. Further, the paint for the peelable coating film is, for example, an aqueous dispersion resin composition in which at least a resin is dissolved or dispersed in water. As the aqueous dispersion resin composition, usually, one in which a resin is dispersed in the presence of a surfactant is used, but as long as the resin is dispersed and contained in water, one that has become an aqueous dispersion by self-dispersion of a self-dispersible resin can be used. The aqueous dispersion resin composition may be an emulsion, and is preferably an emulsion-type resin composition using a polymer emulsion obtained by emulsion polymerization.

[0032] The organic solvent is not particularly limited, and examples thereof include the following. Alcohol solvents such as methanol, ethanol, propanol, butanol, pentanol, hexanol, octanol, ethylene glycol monomethyl ether, ethylene glycol monobutyl ether, propylene glycol monomethyl ether, diethylene glycol monoethyl ether, etc. Aliphatic hydrocarbon solvents such as pentane, hexane, octane, decane, cyclohexane, etc. Aromatic hydrocarbon solvents such as benzene, toluene, xylene, ethylbenzene, mesitylene, cumene, pseudocumene, tetralin, chlorobenzene, etc. Ester solvents such as ethyl acetate, butyl acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, methyl lactate, ethyl lactate, propyl lactate, butyl lactate, ethylhexyl lactate, amyl lactate, isoamyl lactate, ethoxyethyl propionate, γ-butyrolactone, etc. Ketone solvents such as methyl ethyl ketone, methyl isobutyl ketone, cyclopentanone, cyclohexanone, etc. Halogenated aliphatic hydrocarbon solvents such as methylene chloride, chloroform, etc. Ether solvents such as 1,4-dioxane, tetrahydrofuran, ethylene glycol dimethyl ether, diisopropyl ether, diisobutyl ether, cyclopentyl methyl ether, anisole, diphenyl ether, etc. Aprotic polar solvents such as dimethyl sulfoxide, sulfolane, N,N-dimethylformamide, N,N-dimethylacetamide, N-methyl-2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone, acetonitrile, propionitrile, etc. These organic solvents may be used alone or in combination of two or more.

[0033] As the resin, various resins can be used, and there is no particular limitation. For example, silicone resins, acrylic resins, polystyrene resins, rubber resins, polyurethane resins (urethane resins), vinyl alkyl ether resins, polyvinyl alcohol resins, polyvinyl pyrrolidone resins, polyacrylamide resins, cellulose resins, polyester resins, fluorine resins, etc. can be mentioned. Among these, silicone resins, acrylic resins, or polystyrene resins are preferable. The resin may be used alone or in combination of two or more. The content of the resin in the resin-containing liquid of the resin component is preferably 5 to 95% by mass, preferably 10 to 90% by mass, preferably 15 to 80% by mass, preferably 20 to 70% by mass, preferably 25 to 60% by mass.

[0034] The resin-containing liquid may contain a release agent, a film-forming aid, or a cross-linking agent.

[0035] A release agent is an additive that adjusts the adhesive strength of a formed coating film and aids in peeling from the adherend. By including a release agent, it becomes easier for the coating film formed from the aqueous dispersion resin composition and the surface of the component to be protected (e.g., the coating film) to have appropriate adhesiveness. As the release agent, at least one compound selected from surfactants, polyhydric alcohols, and waxes can be preferably used. These can be used in either a dissolved or dispersed form in water or in a powdered form. Examples of surfactants include anionic surfactants, nonionic surfactants, amphoteric surfactants, etc. Examples of polyhydric alcohols include ethylene glycol, propylene glycol, glycerin, catechol, butanediol, pentanediol, erythritol, glycerin monoalkyl ester, polyethylene glycol, polypropylene glycol, etc. Specific examples of waxes include plant-based; candelilla wax, carnauba wax, rice wax, wood rosin, jojoba oil, etc., animal-based; beeswax, lanolin, sperm whale oil, etc., mineral-based; montan wax, ozokerite, ceresin, etc., petroleum-based; paraffin wax, microcrystalline wax, petrolatum, etc., synthetic hydrocarbon-based; Fischer-Tropsch wax, oxidized polyethylene wax, polyethylene wax, acrylic-ethylene copolymer wax, etc., modified wax-based; montan wax derivatives, paraffin wax derivatives, microcrystalline wax derivatives, etc., hydrogenated waxes; hydrogenated castor oil, hydrogenated castor oil derivatives, etc., others; 12-hydroxystearic acid, stearic acid amide, phthalimide anhydride, bisamide, amide, glycerin ester, sorbitan ester, higher alcohols (C12 or higher, preferably C16 or higher), higher fatty acids (C12 or higher, preferably C16 or higher), etc. These can be used individually or in combination of two or more.

[0036] A film-forming aid is an additive that helps in the formation of a coating film. After the coating film is formed, the film-forming aid functions as a temporary plasticizer that evaporates relatively quickly to improve the strength of the coating film, and an organic solvent with a boiling point of 110 to 200 °C is preferably used. For example, when the water-dispersible resin composition is an emulsion containing a resin component, by blending a film-forming aid, even a resin component with a MFT (Minimum film forming temperature) of 15 to 35 °C or higher can form a film at room temperature, and a highly uniform coating film can be obtained. Specifically, examples include Texanol, propylene glycol monobutyl ether, ethylene glycol methyl ether, ethylene glycol ethyl ether, ethylene glycol monobutyl ether, ethylene glycol mono-normal-butyl ether, diethylene glycol diethyl ether, dipropylene glycol monopropyl ether, carbitol, butyl carbitol, dibutyl carbitol, N-methyl-2-pyrrolidone, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, or benzyl alcohol. Among them, Texanol and ethylene glycol mono-normal-butyl ether are particularly preferred because they have a high film-forming aid effect in small amounts. The film-forming aid may be used alone or in combination of two or more.

[0037] Examples of the crosslinking agent include photocurable monomers, photocuring agents such as photocurable oligomers, isocyanate-based crosslinking agents, epoxy-based crosslinking agents, oxazoline-based crosslinking agents, aziridine-based crosslinking agents, carbodiimide-based crosslinking agents, and metal chelate-based crosslinking agents. These crosslinking agents react with functional groups such as hydroxy groups and carboxy groups introduced into the base polymer to form a crosslinked structure. Since they have high reactivity with the hydroxy groups and carboxy groups of the base polymer and it is easy to introduce a crosslinked structure, as the crosslinking agent, a photocurable monomer, a photocurable oligomer, or an isocyanate-based crosslinking agent is preferred. The crosslinking agent may be used alone or in combination of two or more.

[0038] The resin-containing liquid may contain oil. Examples of the oil include silicone oil, liquid paraffin, surfactant, liquid hydrocarbon, fluorinated oil, wax, petrolatum, animal fats, fatty acids, and the like. The oil may be used alone or in combination of two or more. When the resin-containing liquid contains such an oil, the antifouling effect of the coating film may be more sufficiently exhibited, and the adhesion of dirt may be effectively prevented over a long period.

[0039] The resin-containing liquid may contain other additives. Examples of such other additives include thickeners, colorants, ultraviolet absorbers, light stabilizers, antibacterial agents, antioxidants, defoamers, repellents, fillers, and the like.

[0040] In the resin-containing liquid, fillers or the like can be added to improve the strength. Examples of the filler include silica, titanium oxide, alumina, calcium carbonate, magnesium hydroxide, mica, kaolin, talc, carbon black, layered silicate, viscous mineral, diatomaceous earth, and the like. By adjusting the particle size within the above range, sufficient strength can be imparted to the coating film, the particles can be uniformly dispersed in the coating film, and cracks can be less likely to occur when the coating film is subjected to impact.

[0041] A coating film can be formed by applying the resin-containing liquid to the surface of the component and drying it. After applying the resin-containing liquid to the surface of the component, the applied paint may be heated as necessary. The heating may be for the purpose of drying or for the purpose of curing.

[0042] The coating method is not particularly limited, and for example, it can be applied by a known coating method such as spraying, brushing, roller coating, curtain flow coating, roll coating, dipping, or coater.

[0043] As a method of applying a peelable coating film such that the film thickness at the outer edge portion is greater than that of the coating film at other portions, for example, first, after applying a paint on the design surface of the component to form a uniform coating film, a method of further applying the paint to the outer edge portion while preventing the paint from adhering to other portions using a mask, a guard, or the like can be mentioned.

[0044] The film thickness of the peelable coating film can be measured, for example, using an electromagnetic film thickness gauge (manufacturer: Fischer, product number: DELTA SCOPE FMP10). The film thickness can be, for example, the average value at a plurality of locations (for example, 10 locations).

[0045] In the present embodiment, another film may be provided on the peelable coating film. Specifically, a color base coating film and / or a clear coating film may be further formed on the peelable coating film. That is, the forming method according to the present embodiment may include a step of applying a color base coating film after the step of applying the peelable coating film. Further, the forming method according to the present embodiment may include a step of applying a clear coating film (for example, the above-mentioned one) after the step of applying the color base coating film. Further, the forming method according to the present embodiment may include a step of applying a clear coating film after the step of applying the peelable coating film. By forming the color base coating film and / or the clear coating film, the protection strength can be further improved, or further decoration can be performed.

Example

[0046] Hereinafter, the present embodiment will be described using examples. Note that the following examples do not limit the present embodiment.

[0047] (Base material · Material) As the base material, a stainless steel plate (thickness 5 mm, size: 300 mm × 300 mm) with a clear coating film applied to its surface was used.

[0048] As a paint for a peelable coating film, a silicone resin containing xylene, ethylbenzene, an antioxidant, methyl ethyl ketone, a silica reactant, and titanium oxide (nanoparticles) was used as the main component.

[0049] [Example 1] The above-mentioned paint for a peelable coating film was uniformly applied onto the above-mentioned substrate, and further, the paint for a peelable coating film was applied in an overlapping manner to the surface end portion (range of 10 mm from the outer periphery) of the substrate, so as to form a peelable coating film such that the film thickness near the surface end portion of the substrate was larger than the film thickness of other surface portions, and Sample E1 was obtained. The application was carried out by the spray method. When applying the paint in an overlapping manner to a predetermined portion, spraying was performed while guarding so that the paint was not applied to other portions. Thereby, a coating film having an outer edge portion with a large film thickness was formed.

[0050] Regarding the obtained peelable coating film, the film thickness (10-point average) of the outer edge portion was 60 μm, and the film thickness of the other portion (the film thickness of the inner portion of the outer edge portion, 10-point average) was 20 μm. The film thickness was measured by an electromagnetic film thickness gauge (manufacturer: Fischer, product number: DELTA SCOPE FMP10).

[0051] [Comparative Example 1] The above-mentioned paint for a peelable coating film was uniformly applied onto the clear coating film of the above-mentioned substrate to form a peelable coating film, and Sample C1 was obtained. The application was carried out by the spray method.

[0052] The film thickness (10-point average) of the obtained peelable coating film was 20 μm.

[0053] [Evaluation] For Samples E1 and C1, the durability against the water pressure by a high-pressure washer was evaluated by the following method.

[0054] Figure 2 is a schematic diagram for explaining the positional relationship between a sample composed of a base material 1001 and a peelable coating film 1002 in the durability evaluation and the nozzle 1003 of a high-pressure washer. In this durability evaluation, as shown in Figure 2, the durability of the peelable coating film 1002 formed on the base material 1001 against the water pressure of the high-pressure washer was examined by applying water pressure at a predetermined nozzle pressure to the side surface of the sample plate from an obliquely upward direction for 10 seconds, and the nozzle pressure at which the coating film peeled off was investigated. The nozzle pressure was set to 7 MPa or 9 MPa. Also, the location where the water pressure was applied was changed for each application. The spray angle was set so that the angle between the spray direction and the plane of the sample plate was approximately 45°C, and the spray distance was set so that the distance from the interface end between the base material 1001 and the peelable coating film 1002 to the spray opening of the nozzle 1003 was 10 cm. The results are shown in Table 1.

[0055]

Table 1

[0056] As shown in Table 1, in Comparative Example 1 where a peelable coating film was formed with a uniform film thickness of 20 μm, peeling occurred at a nozzle pressure of 9 MPa. On the other hand, in Example 1 where a peelable coating film was formed such that the film thickness of the inner part was 20 μm as in Comparative Example 1 and the film thickness of the outer edge part was 60 μm, peeling did not occur even at a nozzle pressure of 9 MPa. From this, it can be seen that by increasing the film thickness of the outer edge part, the nozzle pressure required for peeling can be increased. Although the durability of the coating film may improve if the peelable coating film is formed thicker throughout, forming the peelable coating film thicker throughout leads to an increase in the coating amount, an increase in labor and time, etc., resulting in an increase in cost, and also a need to apply high pressure throughout the entire peelable coating film. On the other hand, in this embodiment, since the overall durability of the peelable coating film can be improved only by increasing the film thickness of only the outer edge part, an increase in the coating amount, an increase in labor and time, etc. can be suppressed, and once the outer edge part is peeled off, the film peeling of the remaining part can be easily performed.

[0057] Further, as other examples and comparative examples, samples were prepared by applying a color base paint and a clear paint on the peelable coating films of the above samples E1 and C1, and the durability was evaluated by the above method. As a result, similar to the results obtained in Example 1 and Comparative Example 1, by increasing the film thickness at the outer edge of the peelable coating film, a result was obtained that the nozzle pressure required for peeling could be increased. Thereby, even when applying a color base paint and / or a clear paint for the purpose of decoration, it was confirmed that the durability of the peelable coating film can be improved by increasing the film thickness at the outer edge portion.

[0058] The upper limit value and / or the lower limit value of the numerical range described in this specification can respectively define a preferable range by arbitrarily combining them. For example, the upper limit value and the lower limit value of the numerical range can be arbitrarily combined to define a preferable range, the upper limit values of the numerical range can be arbitrarily combined to define a preferable range, and also the lower limit values of the numerical range can be arbitrarily combined to define a preferable range.

[0059] The claims following this described disclosure are explicitly incorporated into this described disclosure in this specification, and each claim is independent as an individual embodiment. This disclosure includes all those obtained by replacing the independent claims with their dependent claims. Further, additional embodiments derived from the independent claims and the subsequent dependent claims are also explicitly incorporated into this described specification.

[0060] A person skilled in the art can use the above description to make the most of this disclosure. The claims and embodiments disclosed in this specification are merely illustrative and exemplary, and should not be construed as limiting the scope of this disclosure in any sense. With the help of this disclosure, changes can be made to the details of the above embodiments without departing from the basic principles of this disclosure. In other words, various modifications and improvements of the embodiments specifically disclosed in the above specification are within the scope of this disclosure.

[0061] Although the present embodiment has been described in detail above, the specific configuration is not limited to this embodiment, and even if there are design changes within the scope not departing from the gist of the present disclosure, they are included in the present disclosure.

Explanation of Signs

[0062] 1 Removable coating film 1a Outer edge portion of the removable coating film 1b Inner portion of the removable coating film 10 Bonnet 100 Vehicle 1001 Base material 1002 Removable coating film 1003 Nozzle of high-pressure washer

Claims

1. A method of forming a peelable coating film by spraying water or a solvent onto a design surface of at least one component constituting the exterior surface of a vehicle, comprising: a step of applying the peelable coating film such that the film thickness of the outer edge portion of the peelable coating film is greater than the film thickness of the coating film of other portions; The method, wherein the outer edge portion of the peelable coating film is within 50 mm from the outer edge of the coating film.

2. The method according to claim 1, wherein the surface of the component is painted.

3. The method according to claim 2, wherein the surface of the component is a color base coating film or a clear coating film.

4. The method according to any one of claims 1 to 3, wherein the outer edge portion of the peelable coating film is disposed near an end of the design surface of the component.

5. The method according to any one of claims 1 to 4, further comprising a step of applying a color base coating film after the step of applying the peelable coating film.

6. The method according to claim 5, further comprising a step of applying a clear coating film after the step of applying the color base coating film.

7. The method according to any one of claims 1 to 4, further comprising a step of applying a clear coating film after the step of applying the peelable coating film.

8. The method according to any one of claims 1 to 7, wherein the film thickness of the outer edge portion of the peelable coating film is 50 μm or more and 300 μm or less.

9. The method according to claim 8, wherein the film thickness of the outer edge portion of the peelable coating film is 10 μm or more greater than the film thickness of the coating film of the other portions.

10. The method according to claim 8 or 9, wherein the film thickness of the coating film of the other portions is 10 μm or more and 40 μm or less.

11. The method according to any one of claims 1 to 10, wherein the peelable coating film is formed to decorate the exterior of the vehicle.

12. The method according to any one of claims 1 to 10, wherein the peelable coating film is formed to protect the exterior surface of the vehicle.

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