JP2001303292A - Method for manufacturing partially plated resin product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and surely form a plated layer only on a necessary part without forming a groove. SOLUTION: After a film 4 having liquid resistance to a plating solution is fixed to a metallic mold corresponding to a part of a base material 2 made of a resin which needs no plating, a resin is charged in the metallic mold to mold film-integrated molded goods by insert molding. Thereafter, the film- integrated molded goods are subjected to electroless plating treatment to form an electroless plated layer on a surface except the film 4 of the film-integrated molded goods. Then electroplating treatment is executed by electrically conducting the electroless plated layer of the film-integrated molded goods to form an electroplated layer on the electroless plated layer. Thus a plated layer 3 composed of the electroless plated layer and the electroplated layer is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a resin product in which only a portion of a surface of a resin base material that requires plating is plated.

[0002]

2. Description of the Related Art Conventionally, as a resin product partially plated, an automobile part, for example, a front grill is known. To manufacture such a resin product, FIG.
As shown in FIG. 9, a boundary between a portion requiring plating (left side in FIG. 9A) and a portion not requiring plating (right side in FIG. 9A) on the surface of the resin base material 101. A groove 101x having a substantially V-shaped cross section is formed in the line portion, and then the resin substrate 101 is immersed in an electroless plating solution and subjected to an electroless plating treatment to remove the bottom of the groove 101x. Lumber 1
After the electroless plating layer 102 is formed on the surface of No. 01, the resin base material 101 is immersed in an electroplating solution to electrically conduct portions requiring plating. It is something to give.

At this time, since the electroless plating layer 102 formed in a portion that does not require plating is electrically blocked by the groove 101x, no electroplating is formed, and the electroless plating layer is dissolved by the electroplating solution. . On the other hand, in portions requiring plating, an electroplating layer 103 is formed on the surface of the electroless plating layer 102.

[0004] In this way, the surface of the resin base material 101 is coated on the plating layer 10 composed of the electroless plating layer 102 and the electroplating layer 103 only in the portions requiring plating.
4 is formed to produce a so-called partially plated resin product (for example, see Japanese Patent Application Laid-Open No. 6-2).
No. 99391 and JP-A-7-41988).

[0005]

By the way, in the above-mentioned method for manufacturing a partially plated resin product, a boundary between a portion requiring plating and a portion not requiring plating is provided at the boundary between the portion requiring plating and the portion not requiring plating. Although it is necessary to form a groove having a substantially V-shaped cross section, it is difficult to form such a groove with a mold, and the groove is formed by laser processing on the surface of the molded resin base material. In this case, special equipment such as a laser processing machine is required.

If an electroless plating layer is formed at the bottom of the groove in the electroless plating step, a short circuit occurs between the grooves in the electroplating step, and the electroplating step is performed on a portion that does not require plating. Until the electroplating layer is formed, and as a result, a desired product may not be obtained.

[0007] The present invention has been made in view of the above-described problems, and the plating is partially applied to a portion where a plating layer can be easily and reliably formed only at a necessary portion without forming a groove. It is intended to provide a method for producing the applied resin product.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a method of manufacturing a partially plated resin product in which a plating layer is formed only on a portion of the surface of a resin base material that requires plating. There is a mixture of a fluororesin and a thermoplastic acrylic resin or a chlorinated polyolefin resin and a thermoplastic acrylic resin that have liquid resistance to the plating solution in the mold corresponding to the portion of the resin substrate that does not require plating. After fixing the film formed from the mixture of the above, a step of filling the resin into a mold and forming an integrated film product by insert molding, and applying an electroless plating treatment to the integrated film product, The process of forming an electroless plating layer on the surface excluding the film, and conducting electroplating by electrically conducting the electroless plating layer of the film-integrated product. Forming an electroplated layer,
It is characterized by having.

According to the present invention, a film formed from a mixture of a fluororesin and a thermoplastic acrylic resin or a mixture of a chlorinated polyolefin resin and a thermoplastic acrylic resin is less eroded by a plating solution, and has a catalytic core for plating. Is also difficult to form. Therefore, by arranging the film so as to cut the plating layer in a portion not requiring plating, it is possible to cut off electrical conduction to a portion not requiring plating.

[0010] That is, after a film which has been previously shaped into a product shape and trimmed is fixed to a mold corresponding to a portion of the resin base material which does not require plating, insert molding is performed, and then the molded film is integrally molded. The product is subjected to an electroless plating treatment, and an electroless plating layer can be formed only on portions requiring plating except for a film. Next, an electroplating process is performed by electrically conducting the electroless plating layer, and an electroplating layer can be laminated on the electroless plating layer to form a plating layer including the electroless plating layer and the electroplating layer.

As a result, it is possible to easily and reliably form a plating layer only on a required portion without forming a groove.

In the present invention, the film includes:
For example, a transparent film formed from a mixture of a fluororesin and a thermoplastic acrylic resin, a colored film having a pattern such as a pattern, and a base film are sequentially laminated via an adhesive by Mitsubishi Chemical MKV. Product name "AV
"LOY" is commercially available.

In this case, the film made of the mixture may be directly colored with a pattern or the like by, for example, gravure printing or the like, and the colored film may be omitted.

When a colored film formed from such a mixture is used instead of a colored film,
Alternatively, when a colored film is used together with the transparent film formed from the mixture, if the appearance design is required to be applied to a portion not requiring plating in a post-plating process, the appearance design color required in advance is required. It is preferable to apply a color to the pattern or the external design so that the step of applying the primer in the post-processing and the step of applying the external design can be reduced.

Although the substrate film is not particularly limited, it is preferable to use a material having good adhesion to the resin material constituting the resin substrate.

In the present invention, the parting line between the plating layer and the film is preferably provided with a step in design.
The amount of the step is not particularly limited, but is preferably about 0.5 to 1.0 mm from the viewpoint of design. If there is no step before the plating process, after the plating process, not only the step of the thickness of the plating layer (several tens of μm) is exposed to the parting line, but also depending on the plating conditions, the plating layer runs over the composite film. There is a possibility that it will be formed in a bent state, and the appearance will be reduced.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a front grill 1 mounted on the front of a vehicle as a partially plated resin product.

The front grill 1 is made of a resin having characteristics such as weather resistance, impact resistance, heat resistance, and flame retardancy.
A resin substrate 2 made of ABS resin, and the resin substrate 2
And a film 4 (hatched portion in FIG. 1) integrally fixed to a part of the front surface which is a part of the design surface of the above and a part where the plating layer 3 is not formed. I have.

That is, the front grille 1 has a substantially U-shaped frame 11 as viewed from the front, a plurality of partition plates 12 extending in the horizontal direction in the frame 11, and a plurality of vertical plates extending in the frame 11 in the vertical direction. And a mounting plate 14 for mounting a mark plate at a central portion,
And the inner part of the frame 11, the partition plate 12, the connecting plate 13
The plating layer 3 is formed on the mounting plate 14, and the film 4 is integrally fixed to an outer portion of the frame 11.

Here, the plating layer 3 is formed as described below.
It comprises an electroless plating layer 31 and an electroplating layer 32 laminated on the electroless plating layer 31.

The film 4 is formed from a mixture of a fluororesin and a thermoplastic acrylic resin or a mixture of a chlorinated polyolefin resin and a thermoplastic acrylic resin,
It has liquid resistance to electroless plating solution and electroplating solution. That is, it has a characteristic that it is hardly eroded by the plating solution and that a catalyst nucleus is hardly formed.

Although not shown in detail, such a film 4 is a transparent film, a colored film, or the like formed from a mixture of a fluororesin and a thermoplastic acrylic resin.
"AVLOY" (trade name, manufactured by Mitsubishi Chemical MKV) obtained by sequentially laminating a base film formed of a resin having good adhesion to the ABS resin as the resin base material 2 via an adhesive can be given. .

The product name "AVL" manufactured by Mitsubishi Chemical MKV Co., Ltd.
“OY” can be suitably used because the surface deterioration after plating is small.

On the other hand, as shown in FIG. 3, the parting line between the film 4 and the plating layer 3 formed on the resin base material 2 has a thickness of 0.5 from the viewpoint of aesthetic appearance before plating. A step portion 5 of about 1.0 mm is formed.

Next, a method of manufacturing the resin product having the above-described structure will be described.

First, a resin product mold (not shown) corresponds to a portion corresponding to a portion of the resin product which does not require plating,
While being formed into a product shape, an excess portion is trimmed, and the film 4 having liquid resistance to the plating solution is fixed. Thereafter, the mold is clamped, and the resin is filled in the mold, whereby a film-integrated product S integrally provided with the film 4 is molded by insert molding (see FIG. 4).

Next, the film-integrated product S is immersed in an electroless plating solution and subjected to an electroless plating treatment.
Form one. At this time, since the composite film 4 has liquid resistance to the plating solution, the electroless plating layer 31 is not formed on the film 4 (see FIG. 5).

When the electroless plating layer 31 is formed on the surface of the film-integrated product S except the film 4, the film-integrated product S is immersed in the electroplating solution, and the electroless plating layer 31 is electrically connected. And perform an electroplating process. In this case, the electroplating layer 32 is formed by laminating on the surface of the electroless plating layer 31 in the portion requiring plating except the film 4 of the integrated film product S.
Also in this case, since the film 4 has liquid resistance to the plating solution, the electroplating layer 32 is not formed on the film 4 (see FIG. 6).

As a result, the plating layer 3 composed of the electroless plating layer 31 and the electroplating layer 32 can be formed only on the portion of the integrated film product S which requires plating except for the film 4.

The colored film or the transparent film constituting the film 4 is colored in advance with a necessary external design color or external design pattern, so that a primer coating process and a visual design coating process in post-processing are performed. Can be reduced.

The step 5 may be formed in a groove shape as shown in FIG. In this case, the width W and depth D of the groove are not particularly limited, but are preferably about 0.5 to 1.0 mm from the viewpoint of mold strength, mold workability, and design.

When such a step 5 does not exist at the parting line between the plating layer 3 and the film 4 (see FIG. 8A), the thickness t (several tens μm) of the plating layer 3 after the plating treatment. May appear not only on the parting lines, but also depending on the plating conditions, the plating layer 3 may run over the film 4 (see FIG. 8B), and the appearance may be deteriorated.

In the above-described embodiment, the front grille for a vehicle is exemplified as the resin product. However, the resin product is not limited to the front grill, but may be any resin product having a partially plated layer, such as a back panel and a mark plate. There is no particular limitation.

Although the ABS resin was used as the resin base material, polypropylene, polycarbonate A
Various resin materials that can be plated, such as BS (PC / ABS), may be used.

[0036]

As described above, according to the present invention, a film formed in advance into a product shape and trimmed is fixed to a mold corresponding to a portion of the resin base material which does not require plating. After forming, the formed film integrated molded product is subjected to electroless plating treatment to form an electroless plating layer only on the portion requiring plating except for the film, and then the electroless plating layer is electrically conducted. The electroplating process is performed, and the electroless plating layer is laminated on the electroless plating layer to form a plating layer composed of the electroless plating layer and the electroplating layer, so that only the necessary portions are formed without forming grooves. The plating layer can be easily and reliably formed.

[Brief description of the drawings]

FIG. 1 is a front view showing a front grill as an example of a partially plated resin product of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged sectional view showing a step portion.

FIG. 4 is a sectional view showing a part of a manufacturing process of the front grill shown in FIG.

FIG. 5 is a cross-sectional view showing a part of a manufacturing process of the front grill shown in FIG.

FIG. 6 is a cross-sectional view partially illustrating a manufacturing process of the front grill of FIG. 1;

FIG. 7 is an enlarged sectional view showing a modified example of the step portion.

FIG. 8 is an enlarged cross-sectional view showing a case where there is no step portion and a case where plating is performed at that time.

FIG. 9 is a cross-sectional view showing a manufacturing process of a conventional partially plated resin product and an enlarged cross-sectional view of a plating layer.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Front grill (partially plated resin product) 2 Resin base material 3 Plating layer 31 Electroless plating layer 32 Electroplating layer 4 Film 5 Stepped part S Integrated film product

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Claims (1)

[Claims] 1. A method of manufacturing a partially plated resin product in which a plating layer is formed only on a portion of the surface of a resin base material that requires plating, comprising: A film formed from a mixture of a fluororesin and a thermoplastic acrylic resin having a liquid resistance to a plating solution or a mixture of a chlorinated polyolefin resin and a thermoplastic acrylic resin in a mold corresponding to a portion not requiring plating. After fixing, a process of filling the mold with resin and forming an integrated film product by insert molding, and applying an electroless plating process to the integrated film product to apply electroless plating to the surface of the integrated film product excluding the film A step of forming a layer and a step of forming an electroplating layer on the electroless plating layer by performing an electroplating process by electrically conducting the electroless plating layer of the film-integrated product. And a method for producing a partially plated resin product.