Vehicle protected by a peelable protective film

Abstract

To provide a vehicle protected with a peelable protective film having excellent moisture impermeability and adequate adhesive force over a long period of time.SOLUTION: A vehicle protected with a peelable protective film has a metal structure 11, a coated film 21 formed on the metal structure, and a peelable protective film 31 formed on the coated film, wherein the peelable protective film has a resin 4, and a metal plate-like filler 5.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a vehicle protected by a peelable protective film.

Background Art

[0002] For example, vehicles such as automobiles and railways need to protect the paint on the vehicle surface from the adhesion of foreign substances, sunlight, physical damage, etc. during transportation and storage from manufacturing to use. As a method for protecting such paint, for example, a technique of forming a protective film on the painted surface using a water-dispersion of a peelable coating agent containing an acrylic copolymer emulsion has been proposed (see, for example, Patent Document 1). According to the above technique, by imparting appropriate adhesion to the protective film, it is expected to protect the paint of the vehicle while achieving both adhesion during transportation and storage and peelability during use.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When forming a protective film using the conventional technology as described above, the purpose can generally be achieved when the storage period is relatively short. However, under long-term storage conditions exceeding one year (especially in a high-temperature and high-humidity environment), water vapor in the atmosphere penetrates the protective film and deteriorates the paint film, resulting in swelling or stains, or the protective film itself deteriorates due to irradiation such as sunlight, and appropriate adhesion (adhesion and peelability) may be impaired.

[0005] An object of the present invention is to provide a vehicle protected by a peelable protective film having excellent water impermeability and appropriate adhesion over a long period of time.

Means for Solving the Problems

[0006] As a preferred example of the present invention, it includes a metal structure, a coating film formed on the metal structure, and a peelable protective film formed on the coating film. The vehicle protected by the peelable protective film having a resin and a plate-shaped filler of metal is the peelable protective film.

Effect of the Invention

[0007] The present invention can provide a vehicle protected by a protective film having excellent water impermeability and appropriate adhesion over a long period.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Mode for Carrying Out the Invention

[0009] The vehicle in the present invention is a vehicle having a painted part whose surface is painted, and the painted part includes a metal structure, a coating film formed on the metal structure, and a peelable protective film (protective film) formed on the coating film. This peelable protective film is arranged so as to be in contact with the surface of the coating film and contains a resin and a plate-shaped filler of metal.

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited only to the embodiments described in the drawings. In addition, since the configuration other than the painted part in the vehicle is the same as the configuration of the vehicle according to the known art, the detailed description thereof will be omitted.

[0011] FIG. 1 is a diagram showing Example 1. Specifically, FIG. 1 is a schematic configuration diagram of a painted part having a metal structure 11, a coating film 21, and a peelable protective film 31.

[0012] FIG. 3 is a diagram showing a vehicle 401. The vehicle 401 includes wheels 402, a side-sliding door 403, windows 404, a painted portion 405, and a pantograph 406.

[0013] The vehicle 401 is a vehicle having a painted portion 405 with paint applied to its surface. As shown in FIG. 1, the painted portion 405 is generally composed of a metal structure 11, a paint film 21, and a peelable protective film 31.

[0014] The metal structure 11 is composed of, for example, sheet metal formed by shaping a metal material to match the shape of the object. The metal material constituting the metal structure 11 is not particularly limited. Examples of the metal material include steel, aluminum alloy, stainless steel, duralumin, CFRP (carbon fiber reinforced plastic), and the like.

[0015] The paint film 21 is a paint film provided on the metal structure 11. The paint film 21 is disposed at the outermost surface (the portion in contact with the outside air 10) when the vehicle 401 is in use (when the peelable protective film 31 is peeled off, which will be described later). The paint film 21 can be configured to include, for example, a paint having an anticorrosion function for preventing corrosion of the metal structure 11, a base paint such as a putty applied relatively thickly to correct the uneven shape on the surface of the metal structure 11, and a paint having a smooth and vivid color formed on this base paint. The paint film 21 may be composed of a single layer or a plurality of layers.

[0016] The paint film 21 is firmly adhered to the metal structure 11 so as not to be easily peeled off from the metal structure 11. The peel strength between the paint film 21 and the metal structure 11 can be configured to have a peel strength of 4 N / cm or more in a peel test by an adhesive tape peeling method based on the adhesion test (cross-cut method) specified in JIS-K5600, for example.

[0017] The thickness of the coating film 21 can be appropriately selected according to the type of the coating film 21 and the like. For example, when the coating film 21 is a coating film for the purpose of rust prevention of a metal structure and improvement of design properties, it may have a thickness of 10 μm to 1000 μm.

[0018] The peelable protective film 31 is a coating film provided on the coating film 21. The peelable protective film 31 is, for example, a protective film for protecting the coating film 21, and is formed so as to cover the coating film 21 when, for example, manufacturing the vehicle 401.

[0019] The peelable protective film 31 is peeled from the coating film 21 when using the vehicle 401. The peelable protective film 31 is disposed so as to be in contact with the surface of the coating film 21, and includes a resin and a plate-shaped filler of metal.

[0020] Examples of the resin 4 contained in the peelable protective film 31 include those cured using an emulsion such as an acrylic copolymer. Examples of the acrylic copolymer emulsion include one or two or more kinds of alkyl acrylate esters and / or one or two or more kinds of alkyl methacrylate esters, and vinyl acetate or hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, allyl alcohol, etc. that are copolymerizable with these alkyl acrylate esters and / or alkyl methacrylate esters. A copolymer emulsion of one or two or more kinds of vinyl monomers such as a hydroxyl group-containing vinyl monomer, an epoxy group-containing vinyl monomer such as glycidyl acrylate and glycidyl methacrylate, and an aromatic vinyl monomer such as styrene, methyl styrene, dimethyl styrene, ethyl styrene, butyl styrene, and benzyl styrene, etc. can be mentioned.

[0021] By using a cured product using an acrylic copolymer emulsion as the resin 4, the fillers 5 can be reliably adhered to each other. Further, when forming the resin 4, it is preferable to cure it using a heat treatment.

[0022] Incidentally, the above acrylic copolymer emulsion can be used as the resin 4 by combining one or more kinds thereof and setting the glass transition temperature to 20°C or lower. By setting the glass transition temperature to 20°C or lower, it can maintain a rubbery state, be peelable while adhering to the coating film 21, and prevent natural peeling by following the thermal expansion of the coating film 21.

[0023] The filler 5 is particles dispersed in the resin 4. As the shape of the filler 5, for example, a plate-like shape can be adopted. The filler 5 is preferably formed of a water-impermeable and water-absorbing substance. Examples of the material constituting the filler 5 include metal materials such as stainless steel, gold, and silver. Stainless steel is preferable as the material constituting the filler 5.

[0024] By configuring the filler 5 with the above materials, water impermeability, non-absorbency, and light-shielding properties can be further enhanced. Here, the reason why the filler 5 is included in the peelable protective film 31 will be explained. The filler 5 is included in the peelable protective film 31 to enhance water impermeability and light-shielding properties.

[0025] First, the mechanism by which the peelable protective film 31 exhibits water impermeability will be explained. The water impermeability in the peelable protective film 31 is presumably related to the following surface effect and internal effect.

[0026] The surface effect is an effect of preventing external moisture (such as moisture in the outside air 10) from entering the peelable protective film 31. In the peelable protective film 31, the resin 4 and the filler 5 are, for example, in a randomly mixed state. Therefore, as long as the filler 5 occupies at least a part of the surface 31s of the peelable protective film 31, the entry of moisture into the inside of the peelable protective film 31 is blocked according to the occupancy ratio, and the peelable protective film 31 exhibits water impermeability.

[0027] The internal effect is the effect of preventing the moisture that has penetrated into the peelable protective film 31 from penetrating through the inside of the peelable protective film 31. Since the filler 5 is contained in the peelable protective film 31, the penetrated moisture cannot penetrate linearly toward the coating film 21 due to the interference of the filler 5. Therefore, when moisture penetrates toward the coating film 21, the moisture penetration path 40 through which the moisture passes becomes longer than the linear penetration (see the solid line in the peelable protective film 31 in FIG. 1), and as a result, the penetration of moisture is suppressed. Thus, it is considered that the presence of the peelable protective film 31 exhibits excellent water impermeability due to the above-described surface effect and internal effect.

[0028] Next, the mechanism by which the peelable protective film 31 exhibits light-shielding properties will be described. The peelable protective film 31 contains the filler 5, and this filler 5 reflects or absorbs light rays from the outside, such as sunlight. Therefore, it is possible to suppress the light rays from reaching the coating film 21, and by preventing the resin 4 in the vicinity of the coating film 21 from deteriorating, it is possible to maintain appropriate adhesion (adhesion and peelability) over a long period of time.

[0029] The filler 5 is preferably plate-shaped particles. As shown in FIG. 2, the long side direction of the plate-shaped filler 5 generally tends to be oriented in the same direction as the surface direction of the surface 31s of the peelable protective film 31 (the surface opposite to the coating film 21). For this reason, the length of the moisture penetration path 40 through which moisture from the outside passes becomes longer, and the water impermeability can be enhanced. In such a case, it is more preferable that the plate-shaped filler 5 contains particles having a long side of 30 μm or more and 100 μm or less and a short side of 1 / 10 or less of the long side.

[0030] The reason for setting such a range is that the larger the side of the surface of the filler 5, the better. However, if the side length is less than 30 μm, the filler becomes small and the shape becomes spherical, resulting in poor water impermeability. Further, if the side length on the surface of the filler exceeds 100 μm, the shape becomes large and the weight becomes large. In that case, the filler sinks in the solution, and the workability deteriorates when performing a coating operation using the solution.

[0031] Fillers with a short side that is 1 / 10 or less of the long side can stack filler 5, ensuring the length of the moisture penetration path 40, and effectively enhancing moisture impermeability.

[0032] The concentration of filler 5 in the peelable protective film 31 is preferably 1 wt% or more and 50 wt% or less. By setting the concentration of filler 5 within the above range, sufficient moisture impermeability can be ensured, and fillers 5 can be reliably adhered to each other. The thickness of the peelable protective film 31 is not particularly limited. As the thickness of the peelable protective film 31, for example, it may be 10 μm or more and 1000 μm or less. Thereby, the adhesion and peelability between the coating film 21 and the peelable protective film 31 can be achieved simultaneously.

[0033] The peel strength between the coating film 21 and the peelable protective film 31 is preferably 0.1 N / 10 mm or more and 1.4 N / 10 mm or less. Thereby, the adhesion and peelability between the coating film 21 and the peelable protective film 31 can be achieved simultaneously.

[0034] As the lower limit value of the peel strength, 0.3 N / 10 mm is preferable, and 0.5 N / 10 mm is more preferable. By setting the lower limit value of the peel strength to the above value, the adhesion between the coating film 21 and the peelable protective film 31 can be enhanced.

[0035] As the upper limit value of the peel strength, 1.4 N / 10 mm is preferable, and 1 N / 10 mm is more preferable. By setting the upper limit value of the peel strength to the above value, the peelability of the peelable protective film 31 from the coating film 21 can be more reliably exhibited.

[0036] As a peeling mode when peeling the peelable protective film 31 from the coating film 21, it is preferable that the peelable protective film 31 can be continuously peeled at the interface 21s with the coating film 21. Specifically, for example, when pinching the end of the peelable protective film 31 to be peeled and peeling the peelable protective film 31 at a speed of 10 cm / second to 10 m / second along the peeling direction, it is preferable that the peelable protective film 31 can be continuously peeled from the coating film 21 without being torn. Thereby, the peelable protective film 31 can be smoothly peeled without taking excessive labor.

[0037] Next, a method for forming the painted portion 405 of the vehicle 401 will be described. First, a metal structure 11 formed into a predetermined shape is prepared, and a coating film 21 and a peelable protective film 31 are formed on the metal structure 11 in this order of the coating film and the peelable protective film 31.

[0038] As a method for forming the coating film 21, a known technique can be appropriately applied according to its configuration (type, function, etc.). As a method for forming the peelable protective film 31, for example, a composition containing a polymer (or a polymer alone, or a polymer and a curing agent), a filler 5, and a solvent used for forming the peelable protective film 31 is applied on the coating film 21, and the peelable protective film 31 is formed by heating and curing at a predetermined temperature for a predetermined time.

[0039] As described above, since the painted portion 405 of the vehicle 401 has the above configuration, excellent water impermeability and appropriate adhesion (adhesion and peelability) can be maintained over a long period. As a result, it is possible to prevent the appropriate adhesion to the coating film 21 from being impaired, and the occurrence of swelling or stains on the coating film 21. Note that the present invention is not limited to the configuration of the above-described embodiment.

[0040] Next, Example 1 and Comparative Examples of the present invention will be described. <Fabrication of Painted Portion> Materials used in Example 1 and Comparative Examples will be described. [A] Metal Structure (A-1) Metal Material: Aluminum Alloy (A5052), Thickness: 3 mm, Surface Shape: Flat (No Step) [B]Coating film (B-1) Solution-based paint, urethane resin paint (manufactured by Nippon Paint Co., Ltd.) [C]Peelable protective film (C-1) Acrylic copolymer emulsion (alkyl acrylate) (manufactured by Linley Co., Ltd., model number: PA-2) (C-2) Filler: Plate-shaped stainless steel particles (manufactured by Toyo Aluminum Co., Ltd., average particle size 60 μm) (C-3) Solvent: Distilled water

Example

[0041] On the metal material (A-1) as a metal structure, a solution-based paint (B-1) was applied and heat-treated at 50 °C to produce a coating film with a thickness of 50 μm. Next, on the said coating film, a composition (solution of peelable protective film) containing 40 parts by weight of acrylic copolymer emulsion C-1, 40 parts by weight of filler C-2, and 60 parts by weight of solvent C-3 was applied. Then, by heat-treating at 50 °C for 10 minutes to remove solvent C-3 by drying etc., an outer layer with a thickness of 250 μm was formed (constituting the peelable protective film), and the configuration of Example 1 was obtained (see Figure 1).

[0042] The peelable protective film of this example is a peelable protective film composed of a composition where the resin component of the acrylic copolymer is 50% by weight and filler C-2 is 50% by weight.

[0043] Next, Comparative Example 1 will be described.

[0044] On the coating film formed in the same manner as in Example 1, a composition (solution without filler) containing 40 parts by weight of acrylic copolymer emulsion C-1 and 60 parts by weight of solvent C-3 was applied, and then heat-treated at 50 °C for 10 minutes to produce a protective film with a thickness of 500 μm, obtaining Comparative Example 1.

[0045] The peelable protective film of this Comparative Example 1 is a peelable protective film with a composition that does not have filler C-2.

[0046] Next, Comparative Example 2 will be described.

[0047] After applying a composition containing 40 parts by weight of acrylic copolymer emulsion C-1, 50 parts by weight of filler C-2, and 60 parts by weight of solvent C-3 onto the coating film formed in the same manner as in Example 1, heat treatment was performed at 50 °C for 10 minutes to produce a protective film with a thickness of 500 μm, and Comparative Example 2 was obtained.

[0048] The peelable protective film of Comparative Example 2 is a peelable protective film having a composition containing more than 50% by weight of filler C-2.

[0049] Next, the evaluations of Example 1, Comparative Example 1, and Comparative Example 2 will be described.

[0050] Water impermeability and adhesion (adhesion and peelability) were evaluated, and the results are shown in Figure 2. [Water impermeability] For each of Example 1, Comparative Example 1, and Comparative Example 2, an accelerated test was conducted by exposing them to an environment of 60 °C and 90% humidity for 100 hours. Then, the water vapor transmission rate was measured in accordance with the water vapor transmission rate test method (cup method) for moisture-proof packaging materials specified in JIS Z0208, and this measured value was used as an index of water impermeability.

[0051] Figure 2 is a diagram showing the measurement results of the water permeation rate (relative ratio). As shown in Figure 2, Example 1 has a lower water permeation rate by about 0.7 compared to Comparative Example 1 and about 0.5 compared to Comparative Example 2. Therefore, Example 1 had good water impermeability compared to Comparative Example 1 and Comparative Example 2. [Adhesion (adhesion and peelability)] For each of Example 1 and Comparative Example 2, after conducting the same accelerated test as the accelerated test for [water impermeability], a 180° peel test was performed, and the measured value (peel strength) was used as an index of adhesion.

[0052] The peel strength of Example 1 was 0.85 N / 10 mm, and when the peelable protective film was peeled from the coating film at a speed of 10 cm / second to 10 m / second along the peeling direction, the peelable protective film could be continuously peeled from the coating film without being torn, and good peelability was obtained.

[0053] On the other hand, in Comparative Example 2, it was difficult to continuously peel from the coating film. When peeling about 20 mm, it would be torn and good peelability could not be obtained.

[0054] According to this example, excellent water impermeability can be maintained over a long period. In addition, it is possible to realize a peelable protective film for temporarily protecting a product during distribution, for example, when the product is temporarily stored outdoors or may be exposed outdoors during distribution, and a vehicle protected by this protective film.

Explanation of symbols

[0055] 4 Resin, 5 Filler, 11 Metal structure, 21 Coating film, 31 Peelable protective film, 401 Vehicle, 402 Wheel, 403 Side sliding door, 404 Window, 405 Coated part, 406 Pantograph

Claims

1. A metal structure, a coating film formed on the metal structure, and a peelable protective film formed on the coating film, wherein the peelable protective film has a resin and a plate-shaped filler of metal, and a vehicle protected by a peelable protective film in which the concentration of the filler in the peelable protective film is 50% by weight.

2. In the vehicle protected by the peelable protective film according to Claim 1, the filler is plate-shaped particles having a long side of 30 μm or more and 100 μm or less and a short side of 1 / 10 or less of the long side, and a vehicle protected by a peelable protective film.

3. In the vehicle protected by the peelable protective film according to Claim 2, the filler is stainless steel, and a vehicle protected by a peelable protective film.

4. In the vehicle protected by the peelable protective film according to Claim 3, the resin is a polymer of methacrylic ester or acrylic ester, and a vehicle protected by a peelable protective film having a glass transition temperature of 20°C or lower.

5. In the vehicle protected by the peelable protective film according to Claim 4, the peel strength between the coating film and the peelable protective film is 0.1 N / 10 mm or more and 1.4 N / 10 mm or less, and a vehicle protected by a peelable protective film.

6. A method for forming a peelable protective film on a vehicle having a metal structure and a coating film formed on the metal structure, comprising: applying a composition containing a resin, a filler, and a solvent to the coating film, curing to form a peelable protective film, wherein the peelable protective film has a resin and a plate-shaped filler of metal, and a method for forming a peelable protective film of a vehicle in which the concentration of the filler in the peelable protective film is 50% by weight.

7. In the method for forming a peelable protective film of a vehicle according to Claim 6, removing the solvent by drying to form the peelable protective film, and a method for forming a peelable protective film of a vehicle.

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