KR102651609B1 - Plastic parts and method for manufacturing the same - Google Patents

Abstract

Disclosed is a plastic part that exhibits excellent decoration and a luxurious design pattern, solves the problem of delamination between the printed layer and the plating layer, and has excellent reliability, and a method of manufacturing the same.
The method for manufacturing plastic parts according to the present invention includes the steps of (a) preparing a base material; (b) forming a printing layer on the base material; (c) forming a plating layer while the printed layer is semi-dried; and (d) forming a protective layer on the plating layer, wherein the step (c) of forming the plating layer while the printed layer is semi-dried includes (c1) chemical plating on the semi-dried printed layer. forming a first plating layer; and (c2) forming a second plating layer by electroplating on the first plating layer.

Description

Plastic parts and their manufacturing method {PLASTIC PARTS AND METHOD FOR MANUFACTURING THE SAME}

The present invention relates to a plastic part in which a plating layer is formed by chemical plating and electroplating while the printed layer is semi-dried, and a method of manufacturing the same.

Plastic parts made of synthetic resin are widely used inside and outside automobiles and in various home appliances.

Plastic parts are manufactured with metal patterns or designs to provide decoration and various designs. For example, plastic parts can be manufactured by sequentially forming a metal layer and a printing layer on a base material, then forming patterns and patterns using etching or laser irradiation, and forming a protective layer.

However, when forming metal patterns and patterns using etching or laser irradiation, there is a problem in that the reliability and decorativeness are reduced due to the occurrence of lifting between the metal layer and the printed layer during laser irradiation. In addition, the appearance of the injection molded product is flat or only possible in a small area, and the etching process is complicated and the cost increases, making it less economical.

Accordingly, there is a need for research into plastic parts that can provide excellent decoration and luxurious design patterns with only a simple process, and can improve peeling problems and reliability.

The purpose of the present invention is to provide plastic parts that can exhibit excellent decoration and luxurious design patterns.

Another object of the present invention is to provide a plastic part that can solve the problem of delamination between the printed layer and the plating layer.

Another object of the present invention is to provide plastic parts with excellent reliability.

Another object of the present invention is to provide plastic parts that have high strength and excellent wear resistance and durability.

Another object of the present invention is to provide a method for manufacturing plastic parts that has a simple process and can reduce manufacturing costs.

The objects of the present invention are not limited to the objects mentioned above, and other objects and advantages of the present invention that are not mentioned can be understood by the following description and will be more clearly understood by the examples of the present invention. Additionally, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations thereof indicated in the patent claims.

The method for manufacturing plastic parts according to the present invention includes the steps of (a) preparing a base material; (b) forming a printing layer on the base material; (c) forming a plating layer while the printed layer is semi-dried; and (d) forming a protective layer on the plating layer, wherein the step (c) of forming the plating layer while the printed layer is semi-dried includes (c1) chemical plating on the semi-dried printed layer. forming a first plating layer; and (c2) forming a second plating layer by electroplating on the first plating layer.

The printed layer is semi-dried at 40 to 90°C for 20 to 60 minutes, and the following equation 1 may be satisfied.

[Equation 1]

800 ≤ Drying temperature (℃) Χ Drying time (minutes) ≤ 4200

The plastic part according to the present invention includes a base material; A printing layer disposed on the base material; A plating layer disposed on the printing layer; and a protective layer disposed on the plating layer, wherein the plating layer includes a first plating layer and a second plating layer disposed on the first plating layer.

The plastic part according to the present invention can exhibit excellent decoration and a luxurious design pattern according to the printing pattern and plating treatment.

In addition, the plastic part of the present invention can solve the problem of delamination between the printed layer and the plating layer and has excellent reliability.

In addition, the plastic part of the present invention has high strength and excellent wear resistance and durability by forming a plating layer using chemical plating and electroplating.

In addition, the method for manufacturing plastic parts of the present invention has a simple process and can reduce manufacturing costs.

In addition to the above-described effects, specific effects of the present invention are described below while explaining specific details for carrying out the invention.

1 is a flowchart showing a method for manufacturing plastic parts according to the present invention.
Figure 2 is a cross-sectional view of a state in which a printing layer is formed on the base material according to the present invention.
FIG. 3 is a cross-sectional view of a plastic part in which a plating layer and a protective layer are formed on the printed layer shown in FIG. 2.
Figure 4 is a plan view of the plating layer being formed in a semi-dried and completely dried state of the printed layer.
Figure 5 is a schematic diagram showing the plating steps of plastic parts.
Figure 6 is a cross-sectional view of a plastic part in which a primer layer is further disposed between the base material and the printing layer.
Figure 7 shows the results of simulating the temperature and time of the semi-drying conditions of the printed layer for the adhesion test.
Figure 8 shows the results of adhesion simulation at a temperature of 90°C and a time of 20 minutes.
Figure 9 shows the results of adhesion simulation at a temperature of 70°C and a time of 20 minutes.
Figure 10 shows the results of adhesion simulation at a temperature of 40°C and a time of 20 minutes.
Figure 11 shows the results of adhesion simulation at a temperature of 40°C and a time of 60 minutes.
Figure 12 shows the results of adhesion simulation at a temperature of 70°C and a time of 60 minutes.
Figure 13 is an exterior photograph according to Examples 1 and 2.
Figure 14 is a photograph of surface peeling according to Comparative Example 1.

The above-mentioned objects, features, and advantages will be described in detail later with reference to the attached drawings, so that those skilled in the art will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of known technologies related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. In the drawings, identical reference numerals are used to indicate identical or similar components.

Hereinafter, the “top (or bottom)” of a component or the arrangement of any component on the “top (or bottom)” of a component means that any component is placed in contact with the top (or bottom) of the component. Additionally, it may mean that other components may be interposed between the component and any component disposed on (or under) the component.

Below, plastic parts and their manufacturing methods according to some embodiments of the present invention will be described.

The plastic part of the present invention can exhibit excellent decoration and a luxurious design pattern according to the printing pattern and plating process, and at the same time solves the problem of delamination between the printed layer and the plating layer, and has excellent reliability.

In addition, in the present invention, by forming a plating layer using chemical plating and electroplating, it has high strength and has excellent wear resistance and durability.

In order to achieve all of these effects, it is not possible to simply change the arrangement order of the printed layer and the plating layer, but the semi-dry condition of the printed layer must be satisfied in the manufacturing method.

The manufacturing method of the plastic part of the present invention will be described in detail as follows.

1 is a flowchart showing a method for manufacturing plastic parts according to the present invention.

Referring to Figure 1, the method for manufacturing plastic parts of the present invention includes preparing a base material (S110), forming a printed layer (S120), and forming a plating layer by chemical plating and electroplating in a semi-dried state. It includes forming a step (S130) and forming a protective layer (S140).

Plastic parts are made using thermoplastic resins or thermosetting resins, which are polymer compounds made by combining raw materials extracted from petroleum, and can be applied to all fields where plastics can be used, such as home appliances, furniture, and automobile interior materials.

In particular, the plastic parts of the present invention are used as interior materials and interior materials for finishing or decorating the surface of various interior products, console boxes, dashboards, door trims, and exterior garnishes of automobiles. It can be applied to exterior materials.

In the step of preparing the base material, the base material 10 is a plastic material and refers to an injection molded material.

The base materials include polycarbonate (PC), polyurethane (PU), polypropylene (PP), polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), ABS resin (acrylonitrile butadiene styrene resin), polyvinyl chloride (PVC; polyvinyl chloride), polybutylene terephthalate (PBT), polyethylene (PE; polyethylene), polyamide (PA; polyamide), and PC/ABS mix. It may contain one or more types of resin (polycarbonate/acrylonitrile butadiene styrene).

Injection molding is a technology commonly used in industrial settings to create injection molded products by melting resin material, pouring it into a mold, and then hardening it.

Between the step of preparing the base material 10 and the step of forming the printing layer 20 on the base material 10, which will be described later, a pretreatment step of removing foreign substances on the surface of the base material 10 may be further included. there is.

The pre-treatment step can be performed using thinner or/and IPA solvent as a degreasing process prior to painting. By further including a pretreatment step, foreign substances can be removed and an oil-free surface can be created to ensure that the printed layer or plating layer adheres well to the surface of the base material.

Figure 2 is a cross-sectional view of a state in which a printing layer is formed on the base material according to the present invention.

As shown in FIG. 2, a printing layer 20 is formed on the base material 10.

The reason for forming the printing layer 20 directly on the base material 10 is that an image pattern can be given to the plastic part without etching or laser irradiation in terms of process, and the problem of delamination from the plating layer, which will be described later, can be solved. Because there is.

In the step of forming the printing layer, it is preferable to perform pad printing or silk screen.

Pad printing is a method of printing directly on a product using an elastic pad such as rubber or silicone. Pad printing is when you want to print an image pattern or color on a specific location on a printed object, ink is applied to a corrosion plate with an image pattern imprinted on it or a color plate with accumulated color, and the ink accumulated on the image pattern imprinted on the corrosion plate or a color plate is After transferring to the elastic pad, the elastic pad is pressed onto the printed object (injection molded product) to transfer the image pattern or color.

Silk screen applies liquid ink on a screen with a pattern on it, and applies appropriate pressure while applying it with a squeegee, so that the ink passes through only the unblocked portion of the screen and is applied.

By forming a print layer by performing pad printing or silk screen, precise printing is possible on flat, curved, concave surfaces or large areas of the base material, and the desired image pattern and color can be printed in the desired location. there is.

On the other hand, when the print layer is performed by hydraulic transfer, water and a transfer film are used to sink the print object from the top of the transfer film and print a pattern on the surface of the print object by water pressure, so that the desired image pattern is printed at the desired location. There is a downside to this that makes it difficult to do. Additionally, when metal deposition is performed on the hydraulic transfer layer, there is a disadvantage in that the hydraulic transfer pattern does not appear due to the metal deposition.

Accordingly, it is preferable to use pad printing or silk screen to print the desired image pattern and color at the desired location and improve the texture of the design surface while enabling precise printing on the base material.

The ink used in the printing layer 20 contains acrylic resin, epoxy resin, and colored pigment as main ingredients, and may further include one or more additives among light stabilizers, antioxidants, matting agents, and catalysts, but is limited thereto. no.

FIG. 3 is a cross-sectional view of a plastic part in which a plating layer and a protective layer are formed on the printed layer shown in FIG. 2.

As shown in FIG. 3, a metal is deposited on the printed layer 20 to form a plating layer 30, and then a protective layer 40 is formed.

In order to solve surface peeling between the printed layer 20 and the plating layer 30, it is important to form the plating layer 30 while the printed layer 20 is semi-dried.

When the plating layer 30 is formed with the print layer 20 completely dried, the bonding force between the print layer and the plating layer is weakened, resulting in peeling.

Here, complete drying means that the solvent is completely removed by performing general drying conditions at 80 to 90°C for 30 to 120 minutes.

Semi-drying mentioned in the present invention means removing about 40 to 80% of the solvent by performing it at a lower temperature and for a shorter time than general drying conditions.

And the semi-dry state means that the ink does not stick to your hands.

Figure 4 is a plan view of the plating layer being formed in a semi-dried and completely dried state of the printed layer.

As shown in FIG. 4, when the printed layer is semi-dried, the metal is well adhered to the printed layer pattern lines. On the other hand, when the printed layer is completely dried, the metal is not well adhered to the printed layer pattern lines.

That is, compared to the case where the printed layer is completely dried, when the printed layer is semi-dried, excellent adhesion is provided without surface peeling between the printed layer and the plating layer, which is advantageous for application to automobile parts.

Additionally, when the printed layer 20 is semi-dried, the adhesive force between the patterned surface of the printed layer 20 and the plating layer 30 may be greater than the adhesive force between the non-patterned surface and the plating layer.

Here, unpatterned surface refers to an unprinted surface.

In the present invention, in order to solve surface peeling, the printed layer 20 is half-dried at 40 to 90° C. for 20 to 60 minutes, and it is preferable that the following equation 1 is satisfied.

[Equation 1]

800 ≤ Drying temperature (℃) Χ Drying time (minutes) ≤ 4200

The technical significance of these parameters is explained as follows.

Typically, in the field of plastic parts, patterns and patterns are created by forming a printed layer on a plating layer and then performing etching or laser irradiation. However, the process is complicated, which increases manufacturing costs and causes delamination between the plating layer and the printed layer. there was.

As delamination occurred, the reliability of plastic parts deteriorated and it was difficult to create luxurious design patterns.

To solve this problem, the present inventor selected the order of forming the plating layer on the printing layer. In addition, it was confirmed that patterns and pattern effects were equivalent to or better than those of existing physical properties without etching or laser irradiation.

In order to evaluate the peeling problem, the existing complete drying conditions were applied during the process of forming the plating layer on the printed layer.

In general, it is known that in the printing process, the higher the drying temperature and the longer the drying time, the more completely dry it is, and the higher the adhesion, which reduces the occurrence of peeling.

After the printing layer was completely dried, the plating layer was formed, but it was confirmed that the ink was completely dried, the adhesion to the plating layer was weakened, and surface peeling occurred.

To solve the peeling problem, the present inventor adjusted the temperature and time of drying conditions to prevent surface peeling between the printed layer and the plating layer.

As a result of this research, the present inventor was able to display a luxurious design pattern with a simple process by arranging the printing layer and the plating layer, and was able to secure excellent adhesion of the plating layer by semi-drying the printing layer, thereby improving the conventional plastic parts. It was confirmed that all of these problems were improved.

Therefore, in the present invention, in order to develop a plastic part that exhibits excellent decoration and luxurious design patterns, solves the problem of delamination between the printed layer and the plating layer, and has excellent reliability, the printed layer is heated at 40 to 90°C for 20 to 60 minutes. While semi-drying to form a plating layer, it is preferable that the semi-drying conditions satisfy Equation 1 below.

[Equation 1]

800 ≤ Drying temperature (℃) Χ Drying time (minutes) ≤ 4200

After semi-drying the printed layer 20, a pretreatment step of removing foreign substances on the surface may be further included. The solvent used for pretreatment is mainly IPA, as described above.

Figure 5 is a schematic diagram showing the plating steps of plastic parts.

The step of forming a plating layer with the printed layer in a semi-dried state includes forming a first plating layer that provides conductivity by chemical plating on the semi-dried printed layer and forming a second plating layer by electroplating on the first plating layer. It includes steps to:

Specifically, the step of forming the first plating layer by chemical plating includes etching and then reducing the semi-dried printed layer surface, an activation step of adsorbing palladium (Pd) and tin (Sn) on the reduced surface, It includes a second activation step of removing the tin (Sn) and activating palladium (Pd), and forming a nickel layer on the activated surface to form a first plating layer.

In this chemical plating treatment, the oxidizing agent solution selectively elutes rubber components such as butadiene from the injection molded product depending on the etching conditions, thereby providing adhesion to the plating and forming fine irregularities on the surface. During reduction, hexavalent chromium is reduced to trivalent chromium.

In the first activation stage, the etched surface is reacted with a catalytic metal to allow electroless plating to occur. In the second activation step, the tin component is dissolved and palladium is activated to facilitate electroless plating. The nickel layer provides conductivity by precipitating metallic nickel in the catalyst layer to perform electroplating.

The step of forming a second plating layer by electroplating includes forming a copper plating layer on the first plating layer that serves as a buffer between the base material and the metal, and a semi-gloss nickel layer on the copper plating layer to improve corrosion resistance and prevent corrosion. forming a bright nickel layer that imparts gloss and corrosion resistance on the semi-bright nickel layer, forming a MP (microporous) nickel layer that disperses corrosion current on the bright nickel layer, and It includes forming a second plating layer by forming a chrome plating layer having corrosion resistance and wear resistance on the MP nickel layer.

This electroplating treatment provides gloss and cushioning against external shocks through copper plating, and forms fine particles through the MP nickel layer to block corrosion of the chrome layer. Lastly, the chrome plating layer gives the plating a gorgeous appearance and wear resistance.

By forming the plating layer 30 through such chemical plating and electroplating, excellent productivity and uniformity of the metal thin film are achieved.

It also has high strength and has excellent wear resistance and durability.

The plating layer 30 may be disposed on the front surface of the printing layer 20 to cover the printing pattern.

The plating layer 30 may be formed to a thickness of about 1 to 100 μm, preferably 5 to 50 μm, but is not limited thereto.

The protective layer 40 serves to protect the surface of the plating layer 30 and adjust gloss.

In addition, the protective layer 40 improves the appearance of the plastic part, increasing marketability, and protects the plating layer from damage by providing light resistance, chemical resistance, and scratch resistance.

In addition, the protective layer 40 is colorless and transparent, allowing light to pass through, and also provides a glossy gloss effect and ultraviolet ray blocking effect.

The protective layer 40 is also called a clear paint layer, and can be formed by applying a glossy, semi-gloss, or matte clear composition.

The protective layer 40 may include one or more of vinyl resin, epoxy resin, polyurethane resin, acrylic resin, isocyanate resin, and polyol resin, and may further include a dispersant, photoinitiator, UV stabilizer, etc.

The protective layer 40 may be formed to have a thickness of 10 to 50 μm, preferably 20 to 40 μm, but is not limited thereto.

Figure 6 is a cross-sectional view of a plastic part in which a primer layer is further disposed between the base material and the printing layer.

As shown in FIG. 6, between the pretreatment step of removing foreign substances on the surface of the base material 10 and the step of forming the printing layer 20 on the base material 10, a primer is applied to the surface of the pretreated base material. The step of forming layer 15 may be further included.

The primer layer 15 can further improve the adhesion between the base material 10 and the printing layer 20. The primer layer 15 may be formed by applying vinyl resin, epoxy resin, polyurethane resin, acrylic resin, etc.

The plastic part of the present invention includes a base material 10, a printed layer 20 disposed on the base material 10, a plating layer 30 disposed on the printed layer 20, and a protection layer disposed on the plating layer 30. It includes a layer 40, wherein the plating layer 30 includes a first plating layer and a second plating layer disposed on the first plating layer.

The plating layer 30 may be disposed on the entire surface (patterned and non-patterned portions) to cover the pattern of the printed layer 20.

The adhesive force between the patterned surface of the printed layer 20 and the plating layer 30 may be greater than the adhesive force between the non-patterned surface and the plating layer 30. This means that the adhesion on the surface of the printed pattern is relatively high because metal deposition is performed while the printed layer 20 is semi-dried.

The first plating layer may include a nickel layer.

The second plating layer includes a copper plating layer, a semi-gloss nickel layer disposed on the copper plating layer, a glossy nickel layer disposed on the semi-gloss nickel layer, an MP nickel layer disposed on the glossy nickel layer, and a semi-gloss nickel layer disposed on the MP nickel layer. It may include a chrome plating layer disposed on.

As described above, a primer layer 15 may be further disposed between the base material 10 and the printing layer 20.

As the plating layer is disposed on the printed layer, the plastic part of the present invention has plants such as circular or polygonal patterns, column or polygonal column patterns, grid patterns, stripe patterns, dot patterns, mosaic patterns, dobby patterns, and floral patterns. It can display three-dimensional patterns such as patterns, various animal patterns, character patterns, and three-dimensional patterns, and can display excellent decoration and luxurious design patterns. Additionally, the plastic parts can exhibit excellent reliability without surface peeling, and can exhibit high strength, excellent wear resistance, and durability.

In this way, looking at specific examples of plastic parts and their manufacturing methods, they are as follows.

1. Adhesion evaluation

The tape peel test was evaluated according to ISO 2409 or JIS K 5600-5-6. After firmly attaching the prescribed tape JIS Z 1522, pull the tape in a 90° direction to remove it.

The judgment criteria are as follows. When it was between M1.0 and M2.5, peeling did not occur and adhesion was evaluated as excellent.

[Table 1]

Figure 7 shows the results of simulating the temperature and time of the semi-drying conditions of the printed layer for the adhesion test. After forming an ink layer on the injection molded plastic material by pad printing, the drying temperature and drying time were adjusted.

From Figure 7, it can be seen how temperature and time affect peeling evaluation.

In the main effects graph, the Y result value is above 2.5 at a temperature of 40 to 90℃, and it tends to increase as the temperature increases. From 20 to 120 minutes, the Y result value tends to increase at a constant slope as the time increases.

The interaction graph shows the results of applying temperature and time together.

When the temperature was 40℃, 70℃, and 90℃, the Y result value was different depending on the time.

When the temperature was 40°C to 70°C and the drying time was 20 to 60 minutes, the Y value was M2.5 or less. This can be expected that surface peeling will not occur.

Even when the drying time was 20 minutes at a temperature of 70°C to 90°C, the Y value was M2.5 or less.

Conversely, when the drying time is 120 minutes at 40℃ to 90℃ and when the drying time is 60 minutes at above 70℃ but below 90℃, peeling problem can be expected to occur because the Y value exceeds M2.5. .

Based on these results, adhesion simulations were performed depending on the drying temperature and drying time of the printed layer. Figures 7 to 12 show the results of applying drying temperature and drying time together. Figure 8 is at a temperature of 90°C and time 20 minutes, Figure 9 is at a temperature of 70°C and time 20 minutes, Figure 10 is at a temperature of 40°C and time 20 minutes, Figure 11 is at a temperature of 40°C and time 60 minutes, Figure 12 is the result of adhesion simulation at a temperature of 70°C and a time of 60 minutes.

The simulation predicted value y was derived for the target value of the Y axis, and a red solid line is indicated at the corresponding temperature and time.

Referring to Figures 8 to 12, when the semi-dry conditions of 90℃ Χ 20 minutes, 70℃ Χ 20 minutes, 40℃ Χ 20 minutes, 40℃ Χ 60 minutes, and 70℃ Χ 60 minutes are satisfied, M1.0 ~ M2 It represents .5.

Example 1

An injection molded base material made of plastic was prepared, and the surface of the material was degreased with IPA and foreign substances were removed.

A printing layer was formed using ink containing acrylic resin, epoxy resin, and carbon black pigment, and pad printing, and the plating layer was formed while semi-drying at 40° C. for 60 minutes.

The plating layer is etched (sulfuric acid H ₂ SO ₄ 10ml/L, chromium solution CrO ₃ 20ml/L), reduction (20 seconds), activation I (Pd, Sn adsorption), activation II (Sn removal), nickel plating (nickel salt Ni) Chemical plating was performed in the order ²⁺ 5g/L).

Subsequently, copper sulfate plating (copper sulfate CuSO ₄ 10ml/L, Cl ^- 5ml/L), semi-bright nickel plating (nickel sulfate NiSO ₄ 15ml/L, nickel chloride NiCl ₂ 5ml/L, boric acid H ₃ BO ₃ 5ml/L), polishing. Nickel plating (nickel sulfate NiSO ₄ 10ml/L, nickel chloride NiCl ₂ 3ml/L, boric acid H ₃ BO ₃ 5ml/L,), MP nickel plating (nickel sulfate NiSO ₄ 15ml/L, nickel chloride NiCl ₂ 5ml/L, Electroplating was performed in the following order: boric acid H ₃ BO ₃ 5ml/L) and chrome plating (chromium solution CrO ₃ 50ml/L).

Next, a composition containing vinyl resin as a main component was applied on the plating layer and then irradiated with ultraviolet rays of 500 mJ/cm ² to form a protective layer, thereby manufacturing a plastic part.

Example 2

Plastic parts were manufactured under the same conditions as in Example 1, except that the printing layer was formed using a silk screen.

Comparative Example 1

Plastic parts were manufactured under the same conditions as Example 1, except that the printed layer was completely dried at 90°C for 60 minutes.

Comparative Example 2

An injection molded base material made of plastic was prepared, and the surface of the material was degreased with IPA and foreign substances were removed.

After forming a plating layer under the chemical plating and electroplating conditions of Example 1, a pattern was formed by irradiating a laser.

Then, a printed layer was formed on the patterned plating layer using pad printing and completely dried at 90°C for 60 minutes.

Next, a composition containing vinyl resin as a main component was applied to form a protective layer, thereby producing a plastic part.

Comparative Example 3

An injection molded base material made of plastic was prepared, and the surface of the material was degreased with IPA and foreign substances were removed.

A pattern was printed on the surface of the material by hydraulic transfer using a transfer film with a predetermined pattern in a water tank and completely dried at 90°C for 60 minutes.

Subsequently, a plating layer was formed under the chemical plating and electroplating conditions of Example 1.

Next, a composition containing vinyl resin as a main component was applied to form a protective layer, thereby producing a plastic part.

Table 2 below shows the results of confirming whether peeling occurred, decoration, and design pattern in Examples 1 and 2 and Comparative Examples 1, 2, and 3.

The occurrence of delamination was indicated as "O" if delamination between the printed layer and the metal layer occurred when observed with the naked eye based on the judgment criteria in Table 1, and as "X" if delamination did not occur. When observed with the naked eye, decoration and design patterns were marked as "excellent" if the pattern formation was clear and the three-dimensional effect and color were well harmonized, and if the pattern formation was blurred, appeared flat and the colors were not harmonious, it was marked as "poor."

[Table 2]

Referring to Table 2 and Figure 13, it can be confirmed that by satisfying the manufacturing method of the plastic part of the present invention, there is no peeling and a decorative and luxurious design pattern can be displayed.

On the other hand, in Comparative Example 1, peeling occurred because the printed layer was completely dried, and in Comparative Example 2, peeling occurred because the printed layer was formed on the plating layer.

Figure 14 is a photograph of surface peeling according to Comparative Example 1.

Referring to FIG. 14, it is shown that by completely drying the printed layer and then forming the plating layer, bubbles were generated on the surface and surface peeling occurred.

In Comparative Example 3, no peeling occurred when observed with the naked eye, but the decoration and design pattern were insufficient due to hydraulic transfer.

As described above, the present invention has been described with reference to the illustrative drawings, but the present invention is not limited to the embodiments and drawings disclosed herein, and various modifications may be made by those skilled in the art within the scope of the technical idea of the present invention. It is obvious that transformation can occur. In addition, although the operational effects according to the configuration of the present invention were not explicitly described and explained while explaining the embodiments of the present invention above, it is natural that the predictable effects due to the configuration should also be recognized.

10: Base material
15: Primer layer
20: printing layer
30: plating layer
40: protective layer

Claims (12)

(a) preparing a base material;
(b) forming a printing layer on the base material;
(c) forming a plating layer while the printed layer is semi-dried; and
(d) forming a protective layer on the plating layer;
The step (c) of forming a plating layer in a semi-dried state is
(c1) forming a first plating layer by chemical plating on the semi-dried printed layer; and
(c2) forming a second plating layer by electroplating on the first plating layer,
A method of manufacturing a plastic part that satisfies Equation 1 below, wherein the printed layer is semi-dried at 40 to 90°C for 20 to 60 minutes.
[Equation 1]
800 ≤ Drying temperature (℃) Χ Drying time (minutes) ≤ 4200
According to paragraph 1,
The step (c1) of forming a first plating layer by chemical plating on the semi-dried printed layer
Etching and then reducing the semi-dried printed layer surface;
Adsorbing palladium (Pd) and tin (Sn) on the reduced surface;
removing the tin (Sn) and activating palladium (Pd); and
Forming a first plating layer by forming a nickel layer on the activated surface.
According to paragraph 1,
The step (c2) of forming a second plating layer by electroplating on the first plating layer
forming a copper plating layer on the first plating layer;
forming a semi-gloss nickel layer on the copper plating layer;
forming a bright nickel layer on the semi-bright nickel layer;
forming a microporous (MP) nickel layer on the bright nickel layer; and
Forming a chrome plating layer on the MP nickel layer to form a second plating layer.
According to paragraph 1,
A method of manufacturing a plastic part that performs pad printing or silk screen in the step of forming the printing layer.
According to paragraph 1,
Between the steps of (a) preparing a base material and (b) forming a printing layer on the base material,
(a1) A pretreatment step of removing foreign substances from the surface of the base material.
According to clause 5,
Between (a1) the pretreatment step of removing foreign substances on the surface of the base material and (b) forming a printing layer on the base material,
(a2) forming a primer layer on the surface of the pretreated base material.
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