KR102670244B1 - Plastic parts and method for manufacturing the same - Google Patents

Abstract

Disclosed are plastic parts that display two or more colors to produce various visual effects, solve the problem of delamination between the printed layer and the metal layer, and have 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 metal layer by vacuum depositing metal on the printed layer; (d) forming a color coating layer on the metal layer; and (e) forming a clear layer on the color coating 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 color coating layer is formed after forming a metal layer by vacuum depositing a metal on a printed layer, and a method for manufacturing the same.

Plastic parts are widely used as interior and exterior materials for finishing or decorating surfaces in interior products, console boxes, dashboards, door trims, and exterior garnishes of automobiles.

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.

In this way, metal patterns or patterns are used to improve the appearance quality, but there are limitations in producing visual effects of various colors with metal alone.

In addition, when forming metal patterns and patterns using etching or laser irradiation, there are disadvantages in that a lifting phenomenon occurs between the metal layer and the printed layer, reliability is reduced, 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 not only luxurious design patterns but also various visual effects and improve peeling problems and reliability.

The purpose of the present invention is to provide plastic parts that can display various visual effects by displaying two or more colors as well as 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 metal layer.

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

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 metal layer by vacuum depositing metal on the printed layer; (d) forming a color coating layer on the metal layer; and (e) forming a clear layer on the color coating layer.

In the step of forming the color coating layer, a color coating composition containing at least one polymer resin selected from vinyl resin, epoxy resin, polyurethane resin, acrylic resin, isocyanate resin, and polyol resin, and pigment particles may be applied.

The plastic part according to the present invention includes a base material; A printing layer disposed on the base material; a metal layer disposed on the printing layer; A color coating layer disposed on the metal layer; and a clear layer disposed on the color coating layer.

The color coating layer may include pigment particles.

The plastic part according to the present invention can display not only a luxurious design pattern but also two or more colors to create various visual effects.

Additionally, the plastic part of the present invention can solve the problem of delamination between the printed layer and the metal layer and has excellent reliability.

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.
Figure 3 is a plan view of a metal layer formed in a semi-dried and completely dried state of the printed layer.
FIG. 4 is a cross-sectional view of a plastic part in which a metal layer, a color coating layer, and a clear layer are formed on the printed layer shown in FIG. 2.
Figure 5 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 6 shows the results of simulating the temperature and time of the semi-drying conditions of the printed layer for the adhesion test.
Figure 7 shows the results of adhesion simulation at a temperature of 90°C and a time of 20 minutes.
Figure 8 shows the results of adhesion simulation at a temperature of 70°C and a time of 20 minutes.
Figure 9 shows the results of adhesion simulation at a temperature of 40°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 60 minutes.
Figure 11 shows the results of adhesion simulation at a temperature of 70°C and a time of 60 minutes.
Figure 12 is a photograph of the exterior according to Example 1.
Figure 13 is a photograph of the exterior according to Comparative Example 4.
Figure 14 is a photograph of the exterior according to Comparative Example 5.

The above-described 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 various visual effects such as luxurious design patterns and two-tones, and at the same time solves the problem of delamination between the printed layer and the metal layer and has excellent reliability.

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 of manufacturing a plastic part of the present invention includes preparing a base material (S110), forming a printing layer (S120), forming a metal layer by vacuum depositing a metal (S130), and color It includes forming a coating layer (S140) and forming a clear layer (S150).

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 can be applied to automobile interior and 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 so that the printed layer or metal layer can be well attached 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 processing, and the problem of delamination from the metal 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, applies it with a squeegee, etc., and applies appropriate pressure so that the ink passes through only the unclogged portion of the screen and is applied.

By forming a printing 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 at 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.

Figure 3 is a plan view of a metal layer formed in a semi-dried and completely dried state of the printed layer.

As shown in FIG. 3, when the printed layer is half-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 metal layer, making it suitable 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 metal layer 30 may be greater than the adhesive force between the non-patterned surface and the metal 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 metal layer and then performing etching or laser irradiation. However, the process is complicated, which increases manufacturing costs and causes delamination between the metal 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 metal layer on the printed layer. In addition, it was confirmed that patterns and pattern effects were at least equal to those of existing physical properties without etching or laser irradiation.

To evaluate the peeling problem, the existing complete drying conditions were applied during the process of forming the metal 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 metal layer was formed, but it was confirmed that the ink was completely dried, the adhesion to the metal 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 metal 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 metal layer, and was able to secure excellent adhesion of the metal layer by semi-drying the printing layer, which is a conventional plastic part. It was confirmed that all of these problems were improved.

Therefore, in the present invention, in order to solve the problem of delamination between the printed layer and the metal layer while providing excellent decoration and a luxurious design pattern, and to develop a plastic part with excellent reliability, the printed layer is heated at 40 to 90°C for 20 to 60 minutes. While semi-drying to form a metal 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.

FIG. 4 is a cross-sectional view of a plastic part in which a metal layer, a color coating layer, and a clear layer are formed on the printed layer shown in FIG. 2.

As shown in FIG. 4, a metal layer 30 is formed by vacuum depositing a metal on the printed layer 20, and then a color coating layer 40 and a clear layer 50 are formed.

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

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

Here, complete drying is a general drying condition that is performed at 80 to 90°C for 30 to 120 minutes to completely remove the solvent.

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.

In the step of forming the metal layer, ionized inert gases and metal particles may be uniformly deposited on the print layer 20 in a plasma atmosphere inside the vacuum chamber.

For example, ion plasma deposition may be performed under conditions such as energy of 0.1 to 10 eV and deposition rate of 0.1 to 100 μm/min, but is not limited thereto.

By forming a metal layer using such vacuum deposition, productivity, uniformity, and precision of the metal thin film are excellent. Additionally, because all evaporated metals are deposited, there is no wastewater and no hazardous substances are emitted, making it environmentally friendly.

While forming the metal layer 30, metal may be vacuum deposited between the patterns of the printed layer 20 and on the upper surface of the pattern. In the process of vacuum depositing a metal, the metal may be preferentially deposited on the non-patterned surface, and the metal may be deposited on the upper surface of the pattern to cover the printed pattern.

The metal layer 30 is made of aluminum (Al), stainless steel, tin (Sn), indium (In), magnesium (Mg), copper (Cu), nickel (Ni), titanium (Ti), and chromium (Cr). ), silver (Ag), and iron (Fe).

The metal layer 30 may be formed to have a thickness of about 5 to 1000 nm, preferably 5 to 500 nm, but is not limited thereto.

In the present invention, it is preferable to form a color coating layer 40 on the metal layer 30 to provide various visual effects by displaying two or more colors, such as two-tone.

The color coating layer 40 does not simply provide color, but can maximize visual effects so that the design patterns formed on the printing layer 20 and the metal layer 30 can be seen in various colors. Accordingly, the exterior of the plastic part has a luxurious surface treatment effect and can exhibit excellent decorativeness.

In particular, by sequentially forming the printing layer 20, the metal layer 30, and the color coating layer 40, the colors given to the printing layer and the color coating layer can display a complex color effect, thereby producing a gorgeous appearance effect.

If the color coating layer 40 is placed on the lower surface of the printed layer 20 or between the printed layer 20 and the metal layer 30, peeling between the layers may occur and the pattern shape may not be clearly visible. there is. In addition, the patterns and patterns of the printed layer and metal layer do not harmonize well with the color of the color coating layer, which reduces the sense of decoration and may make it difficult to display various visual effects.

The color coating layer 40 may be formed by applying a color coating composition.

The color coating composition may include one or more polymer resins selected from vinyl resin, epoxy resin, polyurethane resin, acrylic resin, isocyanate resin, and polyol resin, and pigment particles.

Pigment particles are added to impart color to the color coating layer, and may include ingredients known in the art.

For example, pigment particles may include pigment red, pigment green, pigment blue, pigment yellow, and pigment violet. Other examples include silica, carbonblack, iron oxide, titanium oxide (TiO ₂ ), antimony (Sb), quinacridone, copper-phthalocyanine and chromium. (Cr) may contain one or more known pigment particles.

The color coating composition may contain 1 to 20 parts by weight of pigment particles, preferably 5 to 20 parts by weight, and 10 to 20 parts by weight, based on 100 parts by weight of the polymer resin.

If the content of pigment particles is less than 1 part by weight, it may be difficult to achieve a two-tone effect in plastic parts. Conversely, if the content of pigment particles exceeds 20 parts by weight, agglomeration of particles occurs, lowering dispersibility, and it may be difficult to give a uniform color to the color coating layer. Additionally, interlayer delamination may occur due to particle agglomeration.

The color coating composition may further include one or more additives selected from the group consisting of a leveling agent, light stabilizer, antifoaming agent, and wetting agent, but is not limited thereto.

By applying the color coating composition and drying it at about 60 to 80°C, a color coating layer with a thickness of about 10 to 50 μm can be formed.

The clear layer 50 serves to protect the surface of the color coating layer 40 and adjust gloss.

The clear layer 50 improves the appearance of plastic parts to increase marketability, and protects the metal 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 clear layer 50 is also called a clear painting layer, and can be formed by applying a glossy, semi-gloss, or matte clear composition.

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

Figure 5 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 Figure 5, 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 metal layer 30 disposed on the printed layer 20, and a color disposed on the metal layer 30. It includes a clear layer 50 disposed on the coating layer 40 and the color coating layer 40.

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

The adhesive force between the patterned surface of the printed layer 20 and the metal layer may be greater than the adhesive force between the non-patterned surface and the metal layer. 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 color coating layer 40 may include pigment particles. The color coating layer 40 has a structure in which pigment particles are dispersed in a matrix or thin film of cured polymer resin.

The color coating layer 40 may include 1 to 20 parts by weight of pigment particles based on 100 parts by weight of the polymer resin, and details about this are as described above.

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

The plastic part of the present invention has a circular or polygonal pattern, a cylinder or polygonal column pattern, a grid pattern, a stripe pattern, a dot pattern, a mosaic pattern, a dobby pattern, and a floral pattern, as the metal layer and the color coating layer are disposed on the printed layer. Going beyond three-dimensional patterns such as plant patterns, various animal patterns, character patterns, and three-dimensional patterns, it has the effect of displaying various colors of design patterns and maximizing visual effects. Additionally, the plastic parts can exhibit excellent reliability without surface peeling.

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 6 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 6, 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 simulation was performed according to the drying temperature and drying time of the printed layer. Figures 7 to 11 show the results of applying drying temperature and drying time together. Figure 7 is at a temperature of 90°C and time 20 minutes, Figure 8 is at a temperature of 70°C and time 20 minutes, Figure 9 is at a temperature of 40°C and time 20 minutes, Figure 10 is at a temperature of 40°C and time 60 minutes, Figure 11 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 7 to 11, when the semi-drying 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 printed layer was formed using ink containing acrylic resin, epoxy resin, and carbon black pigment, and pad printing, and then semi-dried at 40°C for 60 minutes, and then Al and Cu were printed in a vacuum ion plasma atmosphere (5 eV energy). A metal layer was formed by vapor deposition.

Next, a color coating composition was prepared by mixing 10 parts by weight of carbon black with 100 parts by weight of a mixed resin of polyurethane resin and acrylic resin. The color coating composition was applied on the metal layer to form a color coating layer with a thickness of 5 μm.

Next, a composition containing vinyl resin as a main component was applied on the metal layer and then irradiated with ultraviolet rays of 500 mJ/cm ² to form a clear 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.

Example 3

Plastic parts were manufactured under the same conditions as in Example 1, except that 20 parts by weight of carbon black was mixed to prepare a color coating composition.

Example 4

Plastic parts were manufactured under the same conditions as in Example 1, except that 30 parts by weight of carbon black was mixed to prepare a color coating composition.

Example 5

Plastic parts were manufactured under the same conditions as in Example 1, except that 0.5 parts by weight of carbon black was mixed to prepare a color coating composition.

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.

A metal layer was first formed by vacuum deposition, then exposed and etched using photoresist.

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

Next, a composition containing vinyl resin as the main component was applied to form a clear 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.

Next, Al and Cu were deposited in a vacuum ion plasma atmosphere to form a metal layer.

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

Comparative Example 4

Plastic parts were manufactured under the same conditions as in Example 1, except that the color coating layer was not formed.

Comparative Example 5

Plastic parts were manufactured under the same conditions as in Example 1, except that the printed layer was not formed.

Table 2 below shows the results of confirming whether peeling occurred and the visual effects of various colors in Examples 1 to 5 and Comparative Examples 1 to 5.

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. The visual effect of various colors was marked as "excellent" if the pattern was clear and two or more colors appeared when observed with the naked eye, and "poor" if the pattern formation was blurred and only one color appeared.

[Table 2]

Referring to Table 2 and FIG. 12, it can be seen that by satisfying the manufacturing method of the plastic part of the present invention, rich and diverse colors are provided, and both visual effects of various colors and excellent adhesion can be exhibited.

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 a metal layer.

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.

In Comparative Example 4 of Figure 13, the visual effect of various colors was found to be insufficient due to the lack of a color coating layer.

Comparative Example 5 in FIG. 14 did not have a printing layer, so it could not display complex colors, so it was found to have no gorgeous appearance effect.

Therefore, the printing layer 20, the metal layer 30, and the color coating layer 40 are formed sequentially, but by satisfying the semi-dry conditions of the printing layer, no peeling occurs, and the color given to the printing layer and the color coating layer is maintained together. By displaying complex colors, a splendid exterior effect can be given.

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: metal layer
40: color coating layer
50: Clear layer

Claims (11)

(a) preparing a base material;
(b) forming a printed layer with a pattern on the base material;
(c) forming a metal layer by vacuum depositing metal on the printed layer;
(d) forming a color coating layer on the metal layer; and
(e) forming a clear layer on the color coating layer,
In the step of forming a print layer with the pattern, pad printing or silk screen is performed,
The printed layer is semi-dried at 40 to 90°C for 20 to 60 minutes, satisfying Equation 1 below,
[Equation 1] 800 ≤ drying temperature (℃) Χ drying time (minutes) ≤ 4200
In the step of forming the metal layer, ionized inert gases and metal particles are deposited on the printing layer in a plasma atmosphere inside a vacuum chamber,
In the step of forming the color coating layer, a color coating composition containing 10 to 20 parts by weight of pigment particles is applied based on 100 parts by weight of the polymer resin.
According to paragraph 1,
In the step of forming the color coating layer,
A method of manufacturing a plastic part comprising applying a color coating composition comprising at least one polymer resin selected from vinyl resin, epoxy resin, polyurethane resin, acrylic resin, isocyanate resin, and polyol resin, and pigment particles.
delete delete delete 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 6,
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.
delete delete delete delete