How to repair peelable paint

Abstract

To provide a repair method capable of suppressing peeling of a coating film by polishing during repair of a peelable coating film.SOLUTION: This embodiment is a method for repairing a peelable coating film. The method includes the steps of: polishing a repair portion of the peelable coating film; applying the peelable coating for repair to the polished repair portion; coating a clear coating on at least a peelable coating for repair; and polishing the clear coating and optionally the peelable coating for repair.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present disclosure relates to a method for repairing a strippable coating. [Background technology]

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

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

[0004] As described above, the peelable coating film can be used for protecting and decorating the vehicle surface, but there are cases where bumps occur during film formation, scratches occur due to accidents, etc. Naturally, it is desirable to repair bumps and scratches that occur in the peelable coating film.

[0005] Here, in repairing a normal coating that is not intended to be peeled off, generally, after grinding down to the repair layer, a primer or the like is applied as an undercoat, and then a base coat or clear coat is applied on top of that. For example, Patent Document 1 discloses a coating composition for automobile repair that is characterized by being composed of a coating film-forming resin and fine particles, and describes a method for repairing an automobile coating that includes a step (1) of applying a primer surfacer, a step (2) of grinding the coating formed by the step (1), and a step (3) of applying a base repair paint. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2003-292904 A Summary of the Invention [Problem to be solved by the invention]

[0007] When repairing a peelable coating, if a normal paint that is not intended to be peeled off is used, the applied paint may react with the peelable coating, making it impossible to peel off. Therefore, when repairing a peelable coating, it is necessary to use a paint for peelable coatings, rather than a paint that is not intended to be peeled off.

[0008] After applying a peelable coating film for repair, a polishing process is performed to eliminate the resulting step as much as possible. However, since the peelable coating film is easily peeled off, when polishing is performed, the peelable coating film may peel off due to the impact of polishing. In particular, depending on the amount of force applied, the peelable coating film may peel off due to the impact of polishing. Therefore, there is a demand for the development of a repair method that suppresses the peeling of the coating film due to polishing when repairing the peelable coating film.

[0009] An object of the present disclosure is to provide a repair method that can suppress peeling of a peelable coating film due to polishing when repairing the coating film. [Means for solving the problem]

[0010] The present inventors conducted intensive research to solve the above-mentioned problems and discovered that peeling of the peelable coating film can be suppressed by applying a peelable coating film for repair, then further applying a clear coating film and then performing a polishing treatment, which led to the present disclosure.

[0011] Therefore, an example of the embodiment is as follows. (1) A method for repairing a peelable coating, comprising the steps of: abrading the repaired area of ​​the peelable coating; applying a peelable repair coating to the polished repair area; applying a clear coat over at least the strippable repair coat; Sanding the clear coat and optionally the removable coat for repairs; The method includes: (2) The method according to (1), further comprising the step of applying a color base coat over the sanded clear coat. (3) The method according to (2), further comprising the step of applying a clear coat over the color base coat. Effect of the Invention

[0012] The present disclosure can provide a repair method that can suppress peeling of a peelable coating film due to polishing when repairing the coating film. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The present embodiment is a method for repairing a peelable coating film, which includes the steps of grinding a portion of the peelable coating film to be repaired, applying a peelable repair coating film to the grounded repair portion, applying a clear coating film on at least the peelable repair coating film, and grinding the clear coating film and, optionally, the peelable repair coating film.

[0014] In this embodiment, a clear coating is applied on the peelable coating applied to the polished repair area, and the peelable coating can be reinforced with the clear coating. By polishing in this reinforced state, peeling of the peelable coating can be suppressed and the surface can be smoothed. In addition, the use of a clear coating can suppress the influence on the appearance, and the adhesion to the peelable coating and the coating formed thereon is also excellent.

[0015] This embodiment will be described in detail below.

[0016] The repair method according to this embodiment relates to a method for repairing a peelable coating film.

[0017] A peelable coating film is formed for the purpose of adhering to the surface of a part until a predetermined time for protection or decoration, and then peeling off as necessary, but as described above, there are cases where it is necessary to repair bumps that occur during film formation, scratches due to accidents, etc. This embodiment relates to a method for repairing repair locations that include such bumps, scratches, etc.

[0018] A peelable coating is formed on the substrate.

[0019] The substrate is not particularly limited. A coating film such as a color base coating film or a clear coating film may be formed on the surface of the substrate. For example, the substrate may be a part that constitutes the exterior surface of a vehicle, and for example, a peelable coating film may be formed on the design surface of the part. The design surface may be a flat surface or a curved surface. The "exterior surface of a vehicle" means a vehicle surface that is exposed to the outside when all openings such as doors present in a vehicle such as an automobile are closed. The "design surface of a part" means a surface of a part that is visible from the outside of the vehicle, and may also be called the exterior surface of a part.

[0020] The parts constituting the exterior surface of the vehicle are not particularly limited as long as at least a part of them is exposed to the exterior surface of the vehicle. Examples of the parts constituting the exterior surface of the 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, an outside door handle, a front bumper, a rear bumper, a tire wheel, a door mirror, a trunk, a quarter panel, an emblem, and the like. In general, a coating is applied to the surface of the parts constituting the exterior surface of the vehicle. The repair method according to the present embodiment is particularly effective for repairing the coating of so-called large objects such as a bonnet or a roof.

[0021] Examples of parts to be repaired include metal materials (iron plates, steel plates, aluminum, stainless steel, etc.) or resin materials that have been painted. For example, when painting a part, a primer layer is formed on the metal material or resin material, and a color base paint and / or a clear paint is applied on the primer layer. The primer layer is a paint or resin film, and can be formed on the surface of the part by electrodeposition coating. The primer layer has a role of ensuring corrosion resistance and adhesion with the color base paint or the clear paint. These coating films are different from the peelable coating film formed in this 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 hardener. The resin that is the main component of the coating film is not particularly limited, but is preferably an aqueous resin. 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 resins contained in the coating material include epoxy resins, epoxy ester resins, polyester resins, acrylic resins (including methacrylic resins), acrylic silicone resins, polyester resins, polyurethane resins, alkyd resins, urethane resins, vinyl resins, urea-based resins, styrene-butadiene-latex (SBR), NBR, etc. The aqueous resins may be used alone or in combination of two or more.

[0022] In one embodiment, a color base coating film and a clear coating film are formed in this order on a surface of the substrate. In another embodiment, the substrate is a part that constitutes an exterior surface of a vehicle.

[0023] (First polishing process) The repair method according to this embodiment first includes a step of polishing the area of ​​the peelable coating film to be repaired.

[0024] In this process, first, the repair area, which is the part of the peelable coating film to be repaired, is polished. For polishing, an abrasive such as sandpaper can be used. Polishing may also be performed using an abrasive while using water (so-called water polishing). Polishing is performed until the peelable coating film of the repair area is exposed, and it is preferable to polish at a gradual gradient.

[0025] (Removable coating process) Next, the repair method according to this embodiment includes a step of applying a peelable repair coating to the ground area to be repaired.

[0026] A repair coating is formed on the repair area where the peelable coating has been ground away using paint for peelable repair coatings.

[0027] The paint for the peelable coating film for repair is not particularly limited, but for example, the same material as the peelable coating film to be repaired can be used. Also, the paint for the peelable coating film for repair may be a different material from the peelable coating film to be repaired, but it is preferable to use the same type as much as possible.

[0028] 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. The paint for the peelable coating film is, for example, a water-dispersed resin composition in which at least a resin is dissolved or dispersed in water. As the water-dispersed resin composition, one in which a resin is dispersed in the presence of a surfactant is usually used, but as long as the resin is dispersed in water, one in which the resin is made into an aqueous dispersion by the self-dispersion of a self-dispersing resin can be used. The water-dispersed resin composition may be an emulsion, and is preferably an emulsion-type resin composition using a polymer emulsion obtained by emulsion polymerization.

[0029] The organic solvent is not particularly limited, but examples thereof include the following: alcohol-based solvents such as methanol, ethanol, propanol, butanol, pentanol, hexanol, octanol, ethylene glycol monomethyl ether, ethylene glycol monobutyl ether, propylene glycol monomethyl ether, and diethylene glycol monoethyl ether; aliphatic hydrocarbon-based solvents such as pentane, hexane, octane, decane, and cyclohexane; aromatic hydrocarbon-based solvents such as benzene, toluene, xylene, ethylbenzene, mesitylene, cumene, pseudocumene, tetralin, and chlorobenzene; ester-based 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, and γ-butyrolactone. For example, ketone-based solvents such as methyl ethyl ketone, methyl isobutyl ketone, cyclopentanone, and cyclohexanone; halogenated aliphatic hydrocarbon-based solvents such as methylene chloride and chloroform; ether-based solvents such as 1,4-dioxane, tetrahydrofuran, ethylene glycol dimethyl ether, diisopropyl ether, diisobutyl ether, cyclopentyl methyl ether, anisole, and diphenyl ether; and organic solvents such as aprotic polar solvents such as dimethyl sulfoxide, sulfolane, N,N-dimethylformamide, N,N-dimethylacetamide, N-methyl-2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone, acetonitrile, and propionitrile. These organic solvents may be used alone or in combination.

[0030] 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, polyvinylpyrrolidone resins, polyacrylamide resins, cellulose resins, polyester resins, fluorine resins, etc. are listed. Among these, silicone resins, acrylic resins, and polystyrene resins are preferred. The resins may be used alone or in combination of two or more. The content of the resin component in the resin-containing liquid 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, and preferably 25 to 60% by mass.

[0031] The resin-containing liquid may contain a release agent, a film-forming aid, or a crosslinking agent.

[0032] A release agent is an additive that adjusts the adhesive strength of the formed coating film and helps it to be peeled off from the adherend. By including a release agent, the coating film formed by the water-dispersed resin composition and the surface of the part to be protected (e.g., the coating film) tend to have a suitable adhesion. As the release agent, at least one compound selected from surfactants, polyhydric alcohols, and waxes can be suitably used. These can be used in either the form dissolved or dispersed in water, or in the form of powder. Examples of surfactants include anionic surfactants, nonionic surfactants, and amphoteric surfactants. Examples of polyhydric alcohols include ethylene glycol, propylene glycol, glycerin, catechol, butanediol, pentanediol, erythritol, glycerin monoalkyl ester, polyethylene glycol, and polypropylene glycol. Specific examples of wax include plant waxes; candela wax, carnauba wax, rice wax, Japan wax, jojoba oil, etc.; animal waxes; beeswax, lanolin, spermaceti, etc.; mineral waxes; montan wax, ozokerite, ceresin, etc.; petroleum waxes; paraffin wax, microcrystalline wax, petrolatum, etc.; Fischer-Tropsch wax, oxidized polyethylene wax, polyethylene wax, acrylic-ethylene copolymer wax, etc.; modified waxes; montan wax derivatives, paraffin wax derivatives, microcrystalline wax derivatives, etc.; hydrogenated waxes; hydrogenated castor oil, hydrogenated castor oil derivatives, etc.; 12-hydroxystearic acid, stearic acid amide, phthalic anhydride imide, bisamide, amide, glycerin ester, sorbitan ester, higher alcohols (C12 or more, preferably C16 or more), higher fatty acids (C12 or more, preferably C16 or more), etc. These may be used alone or in combination of two or more.

[0033] The film-forming aid is an additive that helps the formation of a coating film. The film-forming aid evaporates relatively quickly after the coating film is formed, and serves as a temporary plasticizing function to improve the strength of the coating film. An organic solvent with a boiling point of 110 to 200°C is preferably used. For example, when the water-dispersed resin composition is an emulsion containing a resin component, by blending the film-forming aid, even if the resin component has an MFT (minimum film forming temperature) of room temperature (15 to 35°C) or higher, film formation is possible under a room temperature environment, and a coating film with high uniformity can be obtained. Specific 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, and benzyl alcohol. Among them, Texanol and ethylene glycol mono-normal-butyl ether are particularly preferred because they have a high film-forming auxiliary effect even in a small amount. The film-forming auxiliary may be used alone or in combination of two or more kinds.

[0034] Examples of the crosslinking agent include photocuring agents such as photocuring monomers and photocuring 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 hydroxyl groups and carboxyl groups introduced into the base polymer to form a crosslinked structure. As the crosslinking agent, photocuring monomers, photocuring oligomers, or isocyanate-based crosslinking agents are preferred because they have high reactivity with the hydroxyl groups and carboxyl groups of the base polymer and are easy to introduce a crosslinked structure. The crosslinking agent may be used alone or in combination of two or more types.

[0035] 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, and fatty acids. The oil may be used alone or in combination of two or more. When the resin-containing liquid contains such oil, the antifouling effect of the coating film may be more fully exhibited, and the adhesion of dirt may be effectively prevented for a long period of time.

[0036] The resin-containing liquid may contain other additives, such as thickeners, colorants, ultraviolet absorbers, light stabilizers, antibacterial agents, antioxidants, defoamers, biological repellents, and fillers.

[0037] Fillers and the like can be added to the resin-containing liquid in order to improve strength. Examples of fillers include silica, titanium oxide, alumina, calcium carbonate, magnesium hydroxide, mica, kaolin, talc, carbon black, layered silicate, clay minerals, diatomaceous earth, and the like. By adjusting the particle size within the above range, sufficient strength can be imparted to the coating film, and the particles can be uniformly dispersed in the coating film, making it difficult for cracks to occur when the coating film is subjected to an impact.

[0038] The resin-containing liquid can be applied to the surface of the part and dried to form a coating film. After the resin-containing liquid is applied to the surface of the part, the applied coating may be heated as necessary. The heating may be for the purpose of drying or for the purpose of curing.

[0039] The method of applying the paint for the peelable coating film is not particularly limited, and the paint can be applied by known application methods such as spraying, brush application, roller application, curtain flow, roll application, dip application, coater application, etc. Generally, the repair of the coating film is carried out by a skilled worker making full use of a coating machine such as a hand sprayer.

[0040] In addition, the application of the peelable coating film for repair may be performed by repeatedly applying the paint for the peelable coating film and polishing. In this case, the polishing should be performed carefully using sandpaper with a grain size of #400 to #800 or the like as fine as possible so that the peelable coating film does not peel off. In addition, wet polishing such as water grinding is preferable. It is preferable to repeatedly apply the peelable coating film and polish finely. In this way, by applying the peelable coating film for repair in a touch-up manner, the coating film can be repaired more precisely.

[0041] (Clear coating process) Next, the repair method according to this embodiment includes a step of applying a clear coating film on at least the peelable coating film for repair.

[0042] In this embodiment, a clear coating is applied on the peelable coating for repair formed in the above-mentioned peelable coating application process, thereby reinforcing the peelable coating, which can prevent the peelable coating from peeling off due to impact caused by polishing in a later process.

[0043] In this process, a clear coating is applied on the peelable coating applied for repair, but the clear coating may also be applied to other parts such as the originally formed peelable coating. If necessary, a process of drying the formed coating to a degree that does not harden it, or a process of hardening it, may be added.

[0044] The clear coating is not particularly limited, but a clear coating containing a binder component and the like can be used. The clear coating may contain a coloring component to the extent that the coloring component does not interfere with the design. The form of the clear coating can be a solvent type, a water-based type, or a powder type.

[0045] Examples of resins used in clear coatings include acrylic resins, polyester resins, alkyd resins, urethane resins, and epoxy resins. Resins may be used alone or in combination of two or more. The clear coating may also contain a crosslinking agent. Examples of crosslinking agents include polyisocyanates, melamine resins, and urea resins. Crosslinking agents may be used alone or in combination of two or more. The clear coating may be, for example, a coating in which a resin, a crosslinking agent, and an additive are dissolved or dispersed in an organic solvent or water. In addition, the clear coating preferably contains an acrylic resin and / or a polyester resin as a binder component from the viewpoint of transparency or reinforcing properties.

[0046] In order to ensure ease of painting, it is preferable that a viscosity control agent is added to the clear coating. The viscosity control agent can generally be one that exhibits thixotropy. For example, a conventionally known agent can be used. If necessary, a curing catalyst, a surface conditioner, etc. can be included.

[0047] (Second polishing process) The repair method according to this embodiment then includes a step of sanding off the clear coat and, optionally, the strippable repair coat.

[0048] In this process, the unevenness of the coating film caused by the application of the paint for the coating film that can be peeled off or the clear coating is made continuous and smooth by polishing. For the polishing, an abrasive such as sandpaper can be used. Alternatively, polishing may be performed using an abrasive while using water. In this process, the peelable coating film that is easily peeled off is reinforced by the clear coating film, so that polishing can be performed in a state in which peeling of the peelable coating film is suppressed.

[0049] In the case where the smoothing can be achieved only by polishing the clear coating film disposed on the peelable coating film, only the clear coating film may be polished. Of course, the peelable coating film may also be polished in order to achieve smoothing.

[0050] After the polishing step, a step of curing the clear coating may be included.

[0051] The repair method according to the present embodiment may further include a step of applying a color base coating film on the clear coating film after the polishing step of the clear coating film, etc. The repair method according to the present embodiment may further include a step of applying a clear coating film on the color base coating film. In particular, when a color base coating film and / or a clear coating film has been formed on a peelable coating film to be repaired, it is preferable to apply the color base coating film and / or the clear coating film so as to have a similar configuration in order to repair the film to have a similar appearance.

[0052] Prior to applying the clear coat, the surface of the color base coat may be polished. By polishing the surface of the color base coat, diffuse reflection at the interface between the color base coat and the clear coat formed on top of it can be suppressed, improving the texture of the paint film after repair. Polishing can be performed using an abrasive such as sandpaper. Polishing can also be performed using an abrasive while using water (water sanding).

[0053] The coating material 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 is preferably an aqueous resin. 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 aqueous resin include epoxy resin, epoxy ester resin, polyester resin, acrylic resin (including methacrylic resin), acrylic silicone resin, polyester resin, polyurethane resin, alkyd resin, urethane resin, vinyl resin, urea resin, styrene-butadiene-latex (SBR), and NBR. The aqueous resin may be used alone or in combination of two or more. Such an aqueous resin may be in the form of a water-soluble resin (aqueous resin solution), an emulsion resin, or a dispersion resin. In this specification, the term "emulsion" is used in a broad sense to mean "a liquid in which solid or liquid particles are dispersed."

[0054] In the present embodiment, it is preferable to form a peelable coating film on a painted part. The peelable coating film may be formed to protect the paint on the part, or may be formed to decorate the surface of the part.

[0055] According to the present embodiment described above, peeling of the coating film caused by polishing during repair of the peelable coating film can be suppressed, and the peelable coating film can be repaired.

[0056] The upper limit and / or lower limit of the numerical ranges described in this specification can be arbitrarily combined to define a preferred range. For example, the upper limit and lower limit of the numerical range can be arbitrarily combined to define a preferred range, the upper limit of the numerical range can be arbitrarily combined to define a preferred range, and the lower limit of the numerical range can be arbitrarily combined to define a preferred range.

[0057] The claims following this written disclosure are expressly incorporated herein into this written disclosure, with each claim standing on its own as a separate embodiment. The present disclosure includes all instances in which an independent claim is replaced by its dependent claim. Furthermore, any additional embodiments derived from the independent claim and the subsequent dependent claims are also expressly incorporated into this written specification.

[0058] Those skilled in the art can use the above description to make the most of the present disclosure. The claims and embodiments disclosed herein are merely descriptive and exemplary, and should not be construed as limiting the scope of the present disclosure in any way. With the aid of this disclosure, changes can be made to the details of the above embodiments without departing from the basic principles of the present disclosure. In other words, various modifications and improvements of the embodiments specifically disclosed in the above specification are within the scope of the present disclosure.

[0059] 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 that does not deviate from the gist of this disclosure, they are included in this disclosure.

Claims

[Claim 1] A method for repairing a peelable coating formed for the purpose of being peeled off as needed, comprising the steps of: abrading the repaired area of ​​the peelable coating; applying a peelable repair coating to the polished repair area; applying a clear coat over at least the strippable repair coat; sanding the clear coat, or the clear coat and a removable coating for repairs; The method includes: