JP6133085B2 - How to decorate resin molded products - Google Patents

Description

  The present invention relates to a method for decorating a resin molded product.

  Conventionally, resin molded products molded by injection molding or the like are generally used for exterior parts of electronic components and electronic devices, and the surface of these resin molded products may be decorated with metallic tone. is there.

  As a method for realizing such a metal-like decoration on the conventional resin molded product, the surface of the resin molded product is coated, or a metal-like decoration is applied by a vapor deposition method. A method of forming a protective layer on the top is employed.

  For the decoration of metal tone by such a method, the decoration conditions have been adjusted for the purpose of making the surface of the metal tone more realistic and preventing the spots associated with the decoration from occurring. There has been proposed a decoration method for forming a uniform and uniform thickness (see, for example, Patent Document 1).

  On the other hand, in recent years, decoration of resin molded products such as outer layer parts of electronic devices requires decoration with higher design properties such as decoration with different color tone depending on the surface, color tone and shade change depending on viewing angle Has been.

  However, according to the decorating methods proposed so far, although realistic metallic decoration has been realized, the difference in color tone due to the surface of the resin molded product and the viewing angle as required in recent years It was very difficult to give more decorative designs, such as changes in color tone.

  In addition, when making a metallic tone of a desired color, it is common to color the top coat layer by a method such as coloring, so the decoration with high design properties as described above should be applied. Was even more difficult.

JP 2010-89399 A

  The present invention eliminates the conventional problems from the background as described above, and in the decoration of the metallic tone applied to the surface of the resin molded product, the decoration of a desired color tone is possible, and depending on the surface of the resin molded product It is an object of the present invention to provide a method for decorating a resin molded product that can be decorated with higher design, such as a difference in color tone, a change in color tone or shade depending on the viewing angle.

  That is, the method for decorating a resin molded product of the present invention is characterized by the following.

1stly, it is the decoration method which decorates the surface of a resin molded product by vapor deposition, Comprising: When the film is formed in the vapor deposition surface of a resin molded product, the reflected light of a film | membrane is a range with a wavelength of 380-780 nm, using a target metal composed, have rows deposited from one direction with respect to the deposition surface the whole area of the resin molded product, and laminated by evaporation on a 6-layer onto the deposition surface of the resin molded article, the surface of the resin molded product The first layer is the first layer, the odd layer is formed with TiO ₂ and the even layer is formed with SiO _2. The thickness of the second layer is smaller than that of the first layer. The fourth layer is thinner than the third layer, and the sixth layer is thinner than the fifth layer .

Second, the decorative method of a resin molded article of the first aspect of the present invention is preferably carried out by physical vapor deposition (PVD) method and vapor deposition.

  According to the method for decorating a resin molded product of the present invention, a desired color tone can be decorated in a metal-colored decoration applied to the surface of a resin molded product, and the difference in color tone depending on the surface of the resin molded product, Further, it is possible to provide a method for decorating a resin molded product that can be decorated with a higher design such as a change in color tone or shade depending on the viewing angle.

It is the schematic which shows the decorating method by vapor deposition of this invention. It is a graph which shows the wavelength of each color for determining a color tone. It is a schematic perspective view which shows the resin molded product used in the Example.

  The method for decorating resin molded products of the present invention is to adjust the film thickness according to the surface of the resin molded product by forming a metal thin film from one direction by vapor deposition over the entire deposition target surface of the resin molded product. This is a method for decorating a resin molded product.

  As the resin material of the resin molded product used as the base material used in the method of decorating the resin molded product of the present invention, any resin material conventionally used in various resin molded products can be used without particular limitation. For example, polycarbonate (PC), acrylonitrile butadiene styrene (ABS), polycarbonate / ABS alloy (PC / ABS), thermoplastic elastomer (TPE), polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), cycloolefin polymer (COP) ), Cycloolefin copolymer (COC), polysulfone (PSF), polyimide (PI) and the like.

  Moreover, a resin molded product can be shape | molded by various methods, such as injection molding, compression molding, extrusion molding, blow molding, using these resin materials.

  In the method for decorating a resin molded product of the present invention, from the viewpoint of heat resistance and chemical resistance, a resin molded product molded by injection molding using a polycarbonate resin as a resin material can be more suitably used.

  Further, in the above resin molded product, it is possible to impart various design features of various textures other than the mirror surface to the surface of the resin molded product by forming patterns such as wrinkles, hairlines, and spins on the mold. Is possible.

  In the method for decorating a resin molded product of the present invention, a film is formed by vapor deposition from one direction over the entire surface to be vapor-deposited of the resin molded product, and a metal thin film is formed on the surface for decoration.

  As a deposition method applied to the deposition surface of the resin molded product, various film deposition methods by commonly known deposition can be adopted. Examples of these film deposition methods include physical vapor deposition (PVD method). And chemical vapor deposition (CVD).

  Among these, a physical vapor deposition (PVD method) sputtering method can be suitably used from the viewpoint of controlling the direction of film formation on the vapor deposition surface of the resin molded product.

When vapor deposition is performed in the present invention, the target metal used as a raw material for film formation can be appropriately selected according to the target decoration color tone, and the reflected light of the film after film formation is in a wavelength range of 380 to 780 nm. The target metal is used. Examples of these include, for example, one kind of SiO ₂ , MgF ₂ , TiO ₂ , ZrO ₂ , Nb ₂ O ₅ , Ta ₂ O ₅ , AL ₂ O ₃ , or a target metal in which two or more kinds are mixed. be able to.

  As will be described later, the color tone after film formation varies depending on the film thickness after film formation and the wavelength of reflected light from the film, so it is necessary to select the target metal in consideration of the target color tone of decoration. There is.

  That is, the method for decorating a resin molded product of the present invention is different from the method of directly coating a pigment or the like on the surface of the resin molded product, by selectively using the type of target metal to be deposited, The wavelength of reflected light is determined, and decoration of a desired color tone is realized.

  Although the film thickness by vapor deposition in the decoration method of the resin molded product of this invention is not restrict | limited, About 0.1-1.0 micrometer is considered normally.

  In addition, in the decoration method of the resin molded product of this invention, the positional relationship of the molded product at the time of film-forming by vapor deposition and a vapor deposition direction is very important.

  That is, for example, as shown in FIG. 1, the surface (upper surface 11) on which the resin molded product 1 is desired to be thickened is arranged perpendicular to the vapor deposition direction 2, so that the entire surface of the resin molded product is evaporated. Film formation is performed from the direction.

  With such film formation conditions, the upper surface 11 perpendicular to the vapor deposition direction 2 can be formed into a thick film, and the side surface 12 horizontal to the vapor deposition direction 2 is a very thin film. A thick film can be formed, and an intermediate film can be formed on the inclined surface 13 having an angle with respect to the vertical upper surface 11.

  In the present invention, as a specific method for forming a film from one direction over the entire surface to be vapor-deposited of a resin molded product, a vapor deposition apparatus capable of performing a vapor deposition method such as a sputtering method or a vacuum vapor deposition method is used. It is realized by vapor deposition under conditions corresponding to the vapor deposition method and the metal target in a state where the resin molded product is installed perpendicularly to the metal target.

  Furthermore, in the decorating method of the present invention, a plurality of types of target metals that are films having different reflected light wavelengths are used, and each target metal is formed and laminated, and the layer configuration and film thickness are adjusted appropriately. By doing, it can be set as the decoration of a more complicated color tone.

  That is, it is possible to obtain a desired color tone by combining a target metal, which is a purple film having a short wavelength of reflected light after film formation and a red film having a long wavelength, into a plurality of layers.

  A typical reflection characteristic of each color tone has a wavelength as shown in FIG. 2, and a target metal may be selected to form a film so as to have a wavelength of a target color tone.

Specifically, reflected by stacking the target metal of high reflection wavelength material such as SiO ₂ and the low reflection wavelength material and _TiO 2 of MgF ₂ or the _like, ZrO _{2, Nb} 2 _{O 5} are selectively used as the target metals It becomes possible to adjust the wavelength of light.

  For example, when it is desired to reproduce a blue color tone, the layer structure is calculated so as to have a wavelength of about 460 to 470 nm, and the layers are formed and stacked.

  In addition, there is no restriction | limiting in particular regarding the number of layers and layer structure in the case of setting it as the several layer structure from which a wavelength differs, The number of layers and layer structure which show the effect of this invention can be set suitably. The number of layers can be set to, for example, 3 to 9 layers, preferably 4 to 8 layers, and more preferably 6 layers. Usually, increasing the number of layers tends to increase the reflection peak and increase the brightness.

  In addition, by adopting a plurality of layers having different wavelengths in this way, the light incident on the film is reflected at different wavelengths by each layer having different wavelengths, so that the color tone changes depending on the viewing direction. It becomes possible.

  According to the method for decorating a resin molded product of the present invention, it is possible to decorate the shade by the color tone of the film itself, and it is also possible to adjust the shade of the color tone by appropriately adjusting the color of the resin molded product. It becomes.

  Although the present invention has been described above, the present invention is not limited to the above conditions, and various modifications can be made without departing from the scope of the present invention.

  For example, in the method for decorating a resin molded product of the present invention, if there is dirt or the like on the deposition surface of the resin molded product, there is a possibility that defects such as peeling or pinholes may occur after deposition. The cleaning process can be performed. Also, depending on the type and state of the resin molded product, plasma etching (bombarding) treatment can be performed immediately before vapor deposition for the purpose of improving film adhesion.

  In addition, a top coat layer can be formed for the purpose of improving the durability and mechanical properties (such as wear resistance) of the film after film formation.

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.
Example 1
Using a polycarbonate resin as a resin material, a resin molded product 1 having a shape shown in FIG. 3 was prepared by injection molding. The color of the resin molded product 1 itself was black.

  The resin molded product 1 is set in a sputtering apparatus, and is vapor deposited from one direction toward the upper surface 11 of the resin molded product 1 so as to have a six-layer configuration under the vapor deposition conditions shown in Table 1, and is then laminated. 1 surface was decorated.

  The layer was formed as a six-layer structure by sequentially laminating the layer in contact with the resin molded product 1 as a first layer.

  The upper surface 11 of the resin molded product 1 decorated under the above conditions was decorated with a navy color tone and could be decorated to change to a magenta color tone when viewed from an oblique direction.

  In addition, the upper surface 11 having a thick film thickness has a bright navy color tone, while the side surface 12 having a small film thickness is decorated in a dark blue color tone close to black.

  Thereby, it was confirmed that the color tone by the surface can be controlled by specifying the direction of vapor deposition.

DESCRIPTION OF SYMBOLS 1 Resin molded product 11 Upper surface 12 Side surface 13 Slope 2 Deposition direction

Claims (2)

A decoration method for decorating the surface of a resin molded product by vapor deposition, wherein a target metal whose reflected light is in a wavelength range of 380 to 780 nm when a film is formed on a deposition surface of the resin molded product used, have rows deposited from one direction with respect to the deposition surface the whole area of the resin molded article,
Six layers are deposited and laminated on the deposition surface of the resin molded product, and the first layer is a layer formed on the surface of the resin molded product, the odd layer is formed of TiO ₂ and the even layer is SiO 2. ₂ to form a film,
The thickness of the layer is such that the second layer is thinner than the first layer, the fourth layer is thinner than the third layer, and the sixth layer is thinner than the fifth layer. A method for decorating resin molded products. The method for decorating a resin molded product according to claim 1, wherein the vapor deposition is performed by a physical vapor deposition method (PVD method) .