Method for manufacturing decorated article and method for removing decorative film

Abstract

To provide a method for manufacturing decorative articles in which a decorative film and a molded body are bonded with sufficiently high strength, and an adhesive residue when the decorative film is peeled off is suppressed so that the decorative film can be easily removed from the molded body.SOLUTION: The method of manufacturing decorative articles includes irradiating a surface of a molded body obtained by molding a sheet molding compound base material containing carbon fiber and resin composition with ultraviolet light, and applying a decorative film to the surface.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a decorated article and a method for removing a decorative film. [Background technology]

[0002] Lightweight, high-strength fiber-reinforced plastics (FRPs) formed by molding a sheet molding compound (SMC) substrate containing carbon fiber and a resin composition are used for applications such as the outer panels of vehicles such as automobiles.

[0003] Patent Document 1 describes a method of manufacturing a decorated molded product by simultaneously pressurizing a carbon fiber sheet molding compound (C-SMC) sheet and a resin sheet in a mold to integrate them, and then heat-sealing a decorative film to the resin sheet. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-142466 Summary of the Invention [Problem to be solved by the invention]

[0005] The decorative film and the molded article must be bonded with a sufficiently high strength so that the decorative film does not peel off during use of the decorated article (decorated molded article).

[0006] On the other hand, when the decorated article needs repair during use, it may be necessary to remove the decorative film from the molded article. Therefore, it is desirable that the decorative film be easily removable from the molded article. However, in the decorated article obtained by the manufacturing method described in Patent Document 1, the adhesive or pressure-sensitive adhesive in the decorative film may deteriorate due to environmental loads such as thermal loads, and when the decorative film is peeled off, the adhesive or pressure-sensitive adhesive may remain on the surface of the molded article. Removing the remaining adhesive or pressure-sensitive adhesive requires a great deal of time and cost. Therefore, in the decorated article obtained by the manufacturing method described in Patent Document 1, it may not be easy to remove the decorative film from the molded article after it has been subjected to environmental loads during use.

[0007] Therefore, we provide a method for manufacturing a decorated article, in which the decorative film and the molded body are adhered with sufficiently high strength, and the adhesive residue is suppressed when the decorative film is peeled off, allowing the decorative film to be easily removed from the molded body, and a method for removing the decorative film from a decorated article obtained by the manufacturing method. [Means for solving the problem]

[0008] According to one aspect of the present invention, Irradiating ultraviolet light onto a surface of a molded body obtained by molding a sheet molding compound substrate containing carbon fiber and a resin composition; applying a decorative film to the surface; A method for manufacturing a decorated article is provided, comprising:

[0009] According to one aspect of the present invention, there is provided a method for removing a decorative film from a decorated article produced by the method of the above aspect, comprising the steps of: applying steam generated by heating water to the decorative film; Physically peeling off the decorative film; A method is provided, comprising: [Effects of the Invention]

[0010] A decorated article can be produced in which the decorative film and the molded body are bonded with sufficiently high strength. The decorative film of the produced decorated article can be easily removed. DETAILED DESCRIPTION OF THE INVENTION

[0011] The present invention is not limited to the following embodiments, and various design modifications can be made without departing from the spirit of the present invention as set forth in the claims. In this application, a numerical range expressed using the symbol "to" includes the numerical values ​​before and after the symbol "to" as the lower limit and upper limit, respectively.

[0012] 1. Manufacturing method of decorated articles The manufacturing method of the decorated article according to the embodiment includes irradiating ultraviolet light onto the surface of a molded body obtained by molding a sheet molding compound (SMC) substrate containing carbon fiber and a resin composition, and attaching a decorative film to the surface irradiated with ultraviolet light.

[0013] (i) UV light irradiation The surface of the molded body is irradiated with ultraviolet light. Specifically, at least an area of ​​the surface of the molded body where a decorative film (described later) is to be attached is irradiated with ultraviolet light.

[0014] The molded article may have any shape and size depending on the intended use of the decorative article to be produced. It can be obtained by loading an SMC substrate, which is a sheet-like molding material, into a mold having a cavity of the desired shape and applying pressure and heat. In the manufacturing method according to the embodiment, the SMC substrate contains a resin composition as a matrix resin and carbon fibers as reinforcing fibers. SMC containing carbon fibers is generally referred to as carbon fiber sheet molding compound (C-SMC). Various thermosetting resins and thermoplastic resins can be used as the resin composition, including unsaturated polyester resins and vinyl ester resins. In the manufacturing method according to the embodiment, a molded article obtained from any commercially available C-SMC substrate can be used.

[0015] The ultraviolet light may have a wavelength in the range of 10 to 400 nm. The intensity and irradiation time of the ultraviolet light may be appropriately set depending on the materials of the molded body and the decorative film, the environment in which the decorated article is used, etc. The ultraviolet light irradiation may be carried out in the presence of oxygen.

[0016] (ii) Attaching decorative film Next, a decorative film is attached to the surface of the molded body that has been irradiated with ultraviolet light. There are no particular limitations on the method for attaching the decorative film to the surface of the molded body.

[0017] The decorative film may have any shape and size. The decorative film may have an adhesive layer, a decorative base layer, and a clear layer, which may be laminated in this order. The thickness of each layer may be set appropriately.

[0018] The adhesive layer may contain an adhesive such as an acrylic resin. The decorative base layer may have a design. The decorative base layer may contain a resin such as polyvinyl chloride. The clear layer may be a substantially transparent layer. The clear layer may have high scratch resistance, weather resistance, stain resistance, etc. The clear layer may contain a resin such as polyvinylidene fluoride. A release paper may be attached to the adhesive layer of the decorative film before it is attached to the molded body.

[0019] In this way, a decorated article is manufactured. In the manufactured decorated article, the molded body and the decorative film are bonded with a sufficiently high strength. Furthermore, the decorative film of the manufactured decorated article can be easily removed by the method described below, leaving little or no adhesive residue.

[0020] 2. Method for removing decorative film from decorated articles A method for removing the decorative film from the decorated article obtained by the manufacturing method according to the above embodiment will now be described. The method for removing the decorative film includes applying steam generated by heating water to the decorative film and physically peeling off the decorative film.

[0021] (i) Application of steam Water is heated to generate steam (water vapor). Steam may be generated using a commercially available steam generator. The steam may be at a temperature of 75°C or higher, for example, a temperature in the range of 75 to 95°C, particularly a temperature in the range of 80 to 90°C. Some of the steam may condense to form water droplets. This steam is applied to the decorative film of the decorated article. The time for applying the steam may be set appropriately.

[0022] (ii) Peeling off the decorative film Next, the decorative film is physically peeled off from the molded body. The peeling method is not particularly limited, and may be performed manually or mechanically. Peeling conditions such as peeling speed and peeling angle may be appropriately set from the viewpoints of suppressing adhesive residue and improving work efficiency.

[0023] In this way, the decorative film of the decorated article is removed. In the method according to the embodiment, residual adhesive is prevented from remaining on the surface of the molded article after the decorative film is peeled off. As will be shown in the examples described later, the decorative film can be removed while preventing residual adhesive, even after the decorated article has been subjected to environmental loads such as thermal loads. By preventing residual adhesive, the labor and costs conventionally required to remove the adhesive can be reduced. [Example]

[0024] The present invention will be specifically explained below with reference to examples, but the present invention is not limited to these examples.

[0025] (1) Production of decorative items Example 1 An SMC substrate containing carbon fiber and unsaturated polyester was prepared and molded into a plate-shaped molded body measuring 70 mm x 150 mm.

[0026] A decorative film was prepared, consisting of an adhesive layer, a decorative base layer, and a clear layer, in that order. The adhesive layer was an acrylic resin layer, the decorative base layer was a polyvinyl chloride layer, and the clear layer was a polyvinylidene fluoride layer. The size of the decorative film was 10 mm x 250 mm. Release paper was attached to the adhesive layer of the decorative film.

[0027] Approximately 20mW / cm on the surface of the molded body 2 The specimen was irradiated with ultraviolet light (wavelengths 185 nm and 254 nm) for 7 minutes at an irradiance of 1000 mJ / cm. The cumulative light dose was approximately 8000 mJ / cm. 2 The distance between the light source and the surface of the molded body was approximately 200 mm.

[0028] A decorative film was attached to the surface of the molded body that had been irradiated with ultraviolet light. Specifically, while the release paper was peeled off from the decorative film, the decorative film was applied to the surface of the molded body using a squeegee at a pressure of 30 N / cm. 2 The decorative film was attached to the surface of the molded article by pressing it down with a pressure of 1000 kJ / s and sliding the squeegee in one direction at a speed of 50 mm / s. Thereby, a decorated article was obtained.

[0029] Comparative Example 1 A decorated article was produced in the same manner as in Example, except that the surface of the molded article was not irradiated with ultraviolet light.

[0030] Comparative Example 2 A decorated article was produced in the same manner as in the Examples, except that a coated steel plate was used instead of a molded body formed from an SMC substrate and that ultraviolet light irradiation was not performed. The coated steel plate had a molded body molded from a cold-rolled steel plate (SPC), an electrodeposited layer (cationic epoxy layer), an intermediate coat layer (polyester-based resin layer), a base layer (acrylic resin layer), and a clear coat layer (acid epoxy layer) in this order. The decorative film was attached to the clear coat layer.

[0031] (2) Peel strength measurement The peel strength of the decorative films of the decorated articles of Example 1 and Comparative Examples 1 and 2 was measured as follows.

[0032] The decorative film of each of the decorated articles of Example 1 and Comparative Examples 1 and 2 was manually peeled off approximately 5 mm in the longitudinal direction, attached to a tensile tester, and subjected to a 180-degree peel test. The pulling speed was 200 mm / min. The tensile load was plotted against the elapsed time while the decorative film was being peeled off, and the maximum and minimum values ​​on the resulting graph were averaged, excluding the maximum and minimum values. Similar measurements were performed three times in total, and the average of the measurement results was calculated. This was used as the peel strength value for each decorated article.

[0033] The peel strengths of the decorative films of the decorated articles of Example 1 and Comparative Examples 1 and 2 were as shown in Table 1. The decorated article of Example 1 exhibited a higher peel strength than the decorated articles of Comparative Examples 1 and 2.

[0034] [Table 1]

[0035] (3) Evaluation of adhesive residue The decorated articles of Example 1 and Comparative Examples 1 and 2 were exposed to air at -30°C for 1 hour, and then to air at 90°C for 1 hour. This procedure was repeated a total of 700 times. Next, steam at 80°C to 90°C was applied to the decorative film of each decorated article for 10 seconds. The decorative film was then peeled off by hand at a peeling angle of 90° and a peeling speed of 2 cm / s. The surface of the molded article or coated steel plate from which the decorative film had been peeled was visually inspected for any residual adhesive.

[0036] Furthermore, the decorative films of the decorated articles of Example 1 and Comparative Examples 1 and 2 were peeled off in the same manner as above, except that steam was not applied to the decorative films, and the presence or absence of residual adhesive was then confirmed.

[0037] The results are shown in Table 2. In the decorated article of Example 1, by applying steam to the decorative film, the decorative film could be peeled off from the molded article without leaving any adhesive on the surface of the molded article. In the decorated article of Comparative Example 1, in which the molded article was not irradiated with ultraviolet light before laminating the decorative film, and the decorated article of Comparative Example 2, in which a coated steel plate was used instead of a molded article formed from an SMC substrate, adhesive remained regardless of whether steam was applied or not.

[0038] [Table 2]

Claims

1. Irradiating ultraviolet light onto a surface of a molded body obtained by molding a sheet molding compound substrate containing carbon fiber and a resin composition; applying a decorative film to the surface; A method for manufacturing a decorated article, comprising:

2. The method according to claim 1, wherein the resin composition is an unsaturated polyester resin or a vinyl ester resin.

3. The manufacturing method according to claim 1 or 2, wherein the decorative film has a pressure-sensitive adhesive layer, and the pressure-sensitive adhesive layer contains an acrylic resin.

4. The manufacturing method according to claim 3, wherein the decorative film further comprises a decorative base layer containing polyvinyl chloride and a clear layer containing polyvinylidene fluoride, and the adhesive layer, the decorative base layer, and the clear layer are laminated in this order.

5. A method for removing a decorative film from a decorated article manufactured by the method according to any one of claims 1 to 4, comprising: applying steam generated by heating water to the decorative film; Physically peeling off the decorative film; A method comprising:

6. 6. The method of claim 5, wherein the temperature of the steam is 75°C or higher.

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