KR20230000525A - Plastic parts and method for manufacturing the same - Google Patents

Abstract

Disclosed are a plastic part capable of manifesting various visual effects with at least two colors, solving a delamination issue between a printing layer and a plating layer, and having excellent reliability, and a manufacturing method thereof. In accordance with the present invention, the manufacturing method of the plastic part includes the following steps of: (a) preparing a base material; (b) forming a printing layer on the base material; (c) forming a plating layer on the printing layer; (d) forming a color coating layer on the plating layer; and (e) forming a clear layer on the color coating layer, wherein the step (c) of forming the plating layer on the printing layer includes the following steps of: (c1) forming a first plating layer by performing chemical plating on the printing layer; and (c2) forming a second plating layer by performing electrical plating on the first plating layer.

Description

Plastic parts and manufacturing method thereof {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 plating a printed layer by chemical plating and electroplating, and a method for manufacturing the same.

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

Plastic parts are manufactured to have a metal pattern or a metal pattern in order to present a sense of decoration and various designs. For example, a plastic part may be manufactured by sequentially forming a metal layer and a printing layer on a base material, forming patterns and patterns using etching or laser irradiation, and forming a protective layer.

As such, a metal pattern or metal pattern is used to improve the appearance quality, but there is a limit to displaying visual effects of various colors only with metal.

In addition, when metal patterns and patterns are formed using etching or laser irradiation, a lifting phenomenon occurs between the metal layer and the printed layer, and reliability is deteriorated, and the etching process is complicated and costs are increased, resulting in poor economic efficiency.

Accordingly, there is a need for research on plastic parts capable of imparting various visual effects and improving peeling problems and reliability.

An object of the present invention is to provide a plastic part capable of displaying various visual effects by displaying two or more colors as well as a luxurious design pattern.

Another object of the present invention is to provide a plastic part capable of solving the problem of peeling between a printed layer and a 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 a plastic part having high strength and excellent wear resistance and durability.

Another object of the present invention is to provide a method for manufacturing a plastic part that is simple in process and can reduce manufacturing cost.

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

A method of manufacturing a plastic part 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 on the printed layer; (d) forming a color coating layer on the plating layer; and (e) forming a clear layer on the color coating layer; wherein (c) forming a plating layer on the printed layer comprises (c1) chemical plating on the printed layer to form a first plating layer. forming; and (c2) forming a second plating layer by electroplating on the first plating layer.

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

A plastic part according to the present invention includes a base material; a printed layer disposed on the base material; a plating layer disposed on the printed layer; a color coating layer disposed on the plating layer; and a clear layer disposed on the color coating layer, wherein the plating layer includes a first plating layer and a second plating layer disposed on the first plating layer.

The color coating layer may include pigment particles.

The plastic part according to the present invention may exhibit not only a luxurious design pattern, but also various visual effects by displaying two or more colors.

In addition, the plastic part of the present invention can solve the problem of peeling between the printed layer and the plating layer, and has an effect of 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 manufacturing method of the plastic part of the present invention has a simple process and can reduce manufacturing cost.

In addition to the effects described above, specific effects of the present invention will be described together while explaining specific details for carrying out the present invention.

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

The above objects, features and advantages will be described later in detail with reference to the accompanying drawings, and accordingly, those skilled in the art to which the present invention belongs will be able to easily implement the technical spirit of the present invention. In describing the present invention, if it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the subject matter 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 accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

Hereinafter, the arrangement of an arbitrary element on the "upper (or lower)" or "upper (or lower)" of a component means that an arbitrary element is placed in contact with the upper (or lower) surface of the component. In addition, it may mean that other components may be interposed between the component and any component disposed on (or under) the component.

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

The plastic part of the present invention can exhibit luxurious design patterns and visual effects of various colors such as two-tone, can solve the problem of peeling between the printed layer and the plating layer, and has excellent reliability.

A detailed description of the manufacturing method of the plastic parts of the present invention is as follows.

1 is a flow chart showing a method for manufacturing a plastic part according to the present invention.

Referring to FIG. 1, the method of manufacturing a plastic part of the present invention includes preparing a base material (S110), forming a printed layer (S120), forming a plating layer by chemical plating and electroplating (S130), Forming a color coating layer (S140) and forming a clear layer (S150).

Plastic parts are made using thermoplastic resin or thermosetting resin, which is a polymer compound made by combining raw materials extracted from petroleum, and can be applied to all fields where plastic 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 material is polycarbonate (PC), polyurethane (PU), polypropylene (PP), polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), ABS resin (acrylonitrile butadiene styrene resin), polyvinyl chloride (PVC), polybutylene terephthalate (PBT), polyethylene (PE), polyamide (PA) and PC/ABS blend One or more of resins (polycarbonate/acrylonitrile butadiene styrene) may be included.

Injection molding is a technology commonly used in industrial settings that melts a resin material, pours it into a mold, and hardens it to produce an injection molded product.

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

A pretreatment step may be performed using thinner or/and IPA solvent as a degreasing process prior to painting. By further including a pretreatment step, it is possible to remove foreign substances and make a surface without oil so that the printed layer or the plating layer adheres well to the surface of the base material.

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

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

The reason why the printed layer 20 is directly formed on the base material 10 is that an image pattern can be given to a plastic part without performing etching or laser irradiation in terms of the process, and the problem of separation from the plating layer to be described later can be solved. because there is

In the step of forming the print 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 having elasticity such as rubber or silicon. In pad printing, when you want to print an image pattern or color on a specific location of a printed object, ink is smeared on a corrosion plate imprinted with the image pattern or a color plate on which the color is accumulated, and the ink accumulated on the image pattern or color plate imprinted on the corrosion plate. is transferred to an elastic pad, and then the elastic pad is pressed to the object (injection molded product) to transfer the image pattern or color.

In the silk screen, liquid ink is applied on a screen having a pattern, and appropriate pressure is applied while applying with a squeegee or the like so that the ink passes through only the unblocked portion of the screen and is applied.

When the printing layer is formed by performing pad printing or silk screen, it is possible to precisely print on the flat, curved, concave surface or wide area 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 printing layer is performed by hydraulic transfer, the desired image pattern is printed at the desired location because the water and the transfer film are used to settle the object to be printed from the upper part of the transfer film and the pattern is printed on the surface of the object by the water pressure. There are downsides to doing it. In addition, when metal is deposited on the hydraulic transfer layer, there is a disadvantage in that the pattern of hydraulic transfer does not appear due to the metal deposition.

Accordingly, it is preferable to use pad printing or silk screen in order to precisely print on the base material, print desired image patterns and colors at desired locations, and improve the texture of the design surface.

The ink used in the printing layer 20 includes acrylic resin, epoxy resin, and colored pigment as main components, and may further include one or more additives selected from among light stabilizers, antioxidants, quenchers, and catalysts. no.

3 is a plan view of a state in which a plating layer is formed in a state in which the printing layer is semi-dried and completely dried.

As shown in FIG. 3, in a state in which the printed layer is semi-dried, the metal is well adhered to the pattern line of the printed layer as well. On the other hand, in a state in which the printed layer is completely dried, the metal is not well adhered to the pattern line of the printed layer.

That is, compared to when the printed layer is completely dried, when the printed layer is semi-dried, it provides an excellent adhesive effect without surface peeling between the printed layer and the plating layer, and thus has an advantage suitable for application to automobile parts.

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

Here, non-patterned surfaces refer to unprinted surfaces.

In the present invention, in order to solve the surface peeling, the print layer 20 is semi-dried at 40 to 90 ° C. for 20 to 60 minutes, and it is preferable to satisfy the following formula 1.

[Equation 1]

80 ≤ drying temperature (℃) Χ drying time (minutes) ≤ 420

The technical significance of these parameters is described as follows.

In general, in the field of plastic parts, after forming a printed layer on a plated layer, etching or laser irradiation is performed to show patterns and patterns. there was.

As peeling occurs, the reliability of plastic parts deteriorates, and there is also difficulty in displaying luxurious design patterns.

In order to solve this problem, the present inventors have selected the order of forming the plating layer on the printed layer. In addition, it was confirmed that the pattern and pattern effect were equal to or higher than the existing physical properties without irradiation of etching or laser.

In order to evaluate the peeling problem, in the process of forming the plating layer on the printed layer, the existing complete drying condition was applied as it is.

In general, it is known that the higher the drying temperature and the longer the drying time in the printing process, the more complete drying is achieved and the higher the adhesion, so that peeling can be reduced.

After the printing layer was completely dried, a plating layer was formed, but it was confirmed that surface peeling occurred as the ink was completely dried and the adhesive force with the plating layer was weakened.

In order to solve the problem of peeling, the present inventors adjusted the temperature and time of the drying condition so that the surface peeling between the printed layer and the plating layer was not made.

As a result of these studies, the present inventors can show a luxurious design pattern with a simple process by the order of arrangement of the printed layer and the plating layer, and can secure excellent adhesion of the plating layer by the semi-dry condition of the printed layer. It was confirmed that all of these problems were rectified.

Therefore, in the present invention, in order to present an excellent decorative feeling and luxurious design pattern, solve the problem of peeling between the printed layer and the plating layer, and develop a plastic part having 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-dry condition satisfies Equation 1 below.

[Equation 1]

80 ≤ drying temperature (℃) Χ drying time (minutes) ≤ 420

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

Fig. 4 is a schematic diagram showing a plating step of a plastic part.

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

In this chemical plating treatment, the oxidizing agent solution selectively elutes rubber components such as butadiene from the injected product according to etching conditions to impart adhesion to the plating and form fine irregularities on the surface. Upon reduction, hexavalent chromium is reduced to trivalent chromium.

In the first stage of activation, the etched surface reacts with the catalytic metal to allow electroless plating to occur. In the activation step 2, only electroless plating is facilitated by dissolving tin components and activating palladium. The nickel layer provides conductivity by depositing metallic nickel on the catalyst layer to perform electroplating.

Forming a second plating layer by electroplating is a step of forming a copper plating layer on the first plating layer that serves as a buffer between the base material and metal, and a semi-gloss nickel layer on the copper plating layer to improve corrosion resistance and prevent corrosion. forming a polished nickel layer for imparting luster and corrosion resistance on the semi-bright nickel layer, forming an MP (microporous) nickel layer for dispersing corrosion current on the polished nickel layer, and and forming a second plating layer by forming a chromium plating layer having corrosion resistance and wear resistance on the MP nickel layer.

This electroplating treatment imparts luster and cushioning against external impact through copper plating, and prevents corrosion of the chromium layer by forming fine particles through the MP nickel layer. Finally, the colorful appearance and wear resistance of the plating are imparted through the chrome plating layer.

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

In addition, it has high strength and has excellent wear resistance and durability.

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

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

FIG. 5 is a cross-sectional view of a plastic part in which a plating layer, a color coating layer, and a clear layer are formed on the printed layer shown in FIG. 2 .

As shown in FIG. 5 , after forming the plating layer 30 on the printed layer 20 by chemical plating and electroplating, the color coating layer 40 and the clear layer 50 are formed.

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

When the plating layer 30 is formed in a state in which the printed layer 20 is completely dried, the bonding force between the printed layer and the plating layer is weakened, resulting in peeling.

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

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

Also, the semi-dry state means a state in which ink does not stick to the hand.

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

In addition, it has high strength and has excellent wear resistance and durability.

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

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

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

The color coating layer 40 can maximize visual effects so that the design patterns formed on the printing layer 20 and the plating layer 30 can be seen in various colors, rather than simply providing color. Accordingly, the exterior of the plastic part has a luxurious surface treatment effect and can exhibit an excellent decorative feeling.

In particular, by sequentially forming the printed layer 20, the plating layer 30, and the color coating layer 40, the colors applied to the printed layer and the color coating layer can express a complex color together, resulting in a colorful appearance effect.

If the color coating layer 40 is disposed on the lower surface of the printed layer 20 or disposed between the printed layer 20 and the plating layer 30, peeling between the layers may occur and the pattern shape may not be clearly visible. there is. In addition, since the patterns and patterns of the printed layer and the plating layer do not harmonize well with the color of the color coating layer, it may be difficult to show 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 among vinyl resins, epoxy resins, polyurethane resins, acrylic resins, isocyanate resins, and polyol resins, and pigment particles.

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

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

The color coating composition may include 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.

When the content of the pigment particles is less than 1 part by weight, it may be difficult to exhibit a two-tone effect and various colors of the plastic part. Conversely, if the content of the pigment particles exceeds 20 parts by weight, agglomeration of the particles may occur, resulting in degraded dispersibility, and it may be difficult to impart a uniform color to the color coating layer. In addition, delamination may occur due to particle agglomeration.

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

A color coating layer having a thickness of about 10 to 50 μm may be formed by applying the composition for color coating and drying at about 60 to 80 ° C.

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 plating layer from being damaged by imparting light resistance, chemical resistance, and scratch resistance.

In addition, the protective layer 40 is colorless and transparent, allowing light to pass through, and imparting a glossy gloss effect and a UV blocking effect.

The clear layer 50 is also called a clear coating layer, and may be formed by applying a glossy, semi-glossy, or matte clear composition.

The clear layer 50 may include at least one of a vinyl resin, an epoxy resin, a polyurethane resin, an acrylic resin, an isocyanate resin, and a polyol resin, and may further include a dispersant, a photoinitiator, and a UV stabilizer.

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

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

As shown in FIG. 6, between the pretreatment step of removing foreign substances from the surface of the base material 10 and the step of forming the printed layer 20 on the base material 10, the primer is placed on the pretreated base material surface. A further step of forming layer 15 may be included.

The primer layer 15 may further improve adhesion between the base material 10 and the printed layer 20 . The primer layer 15 may be formed by applying a vinyl resin, an epoxy resin, a polyurethane resin, an acrylic resin, or the like.

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 color disposed on the plating layer 30. It includes a coating layer 40 and a clear layer 50 disposed on the color coating layer 40, and the plating layer 30 includes a first plating layer and a second plating layer disposed on the first plating layer.

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

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

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 form in which a polymer resin is cured.

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 the details for this are as described above.

The first plating layer may include a nickel layer.

The second plating layer includes a copper plating layer, a semi-bright nickel layer disposed on the copper plating layer, a bright nickel layer disposed on the semi-bright nickel layer, an MP nickel layer disposed on the bright nickel layer, and an MP 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 printed layer 20 .

In the plastic part of the present invention, as the plating layer and the color coating layer are disposed on the printed layer, 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, or a flower pattern In addition to three-dimensional patterns such as plant patterns, various animal patterns, character patterns, and three-dimensional patterns, there is an effect of displaying various colors of design patterns and maximizing visual effects. In addition, the plastic part can exhibit excellent reliability without surface peeling.

As described above, a specific embodiment of the plastic part and its manufacturing method is 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 criterion for judgment is as follows. When between M1.0 and M2.5, peeling did not occur and the adhesiveness was evaluated to be excellent.

[Table 1]

6 is a simulation result of temperature and time, which are semi-drying conditions of a printed layer, for an adhesion test. After forming the ink layer by pad printing on the injection-molded plastic material, the drying temperature and drying time were adjusted.

It can be seen from FIG. 6 how temperature and time affect the peeling evaluation.

In the main effect graph, the Y result value shows more than 2.5 at the temperature of 40 ~ 90 ℃, and it shows a tendency to increase as the temperature increases. From 20 to 120 minutes, as the time increases, the Y result value tends to increase with a constant slope.

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

When the temperature was 40 ℃, 70 ℃, 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 showed M2.5 or less. It 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 showed M2.5 or less.

Conversely, when the drying time is 120 minutes at 40 ° C to 90 ° C, and when the drying time is 60 minutes at more than 70 ° C to less than 90 ° C, peeling problems can be expected to occur because the Y value exceeds M2.5 .

Based on these results, adhesion simulations were performed according to the drying temperature and drying time of the printed layer. 7 to 11 are the results of applying both the drying temperature and the drying time. 7 is when the temperature is 90 ° C and the time is 20 minutes, FIG. 8 is when the temperature is 70 ° C and the time is 20 minutes, FIG. 9 is when the temperature is 40 ° C and the time is 20 minutes, FIG. is the adhesion simulation result when the temperature is 70 ℃ and the time is 60 minutes.

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

7 to 11, M1.0 to M2 when semi-drying conditions of 90°C Χ 20 minutes, 70°C Χ 20 minutes, 40°C Χ 20 minutes, 40°C Χ 60 minutes, and 70°C Χ 60 minutes are satisfied. represents .5.

Example 1

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

A printed layer was formed using an ink containing an acrylic resin, an epoxy resin, and a carbon black pigment, and pad printing, and a plating layer was formed in a semi-dried state at 40° C. for 60 minutes.

The plating layer is etching (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 ²⁺ 5 g/L), chemical plating was performed.

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), gloss 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, boric acid Electroplating was performed in the order of H ₃ BO ₃ 5ml/L) and chrome plating (chrome solution CrO ₃ 50ml/L).

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

Subsequently, a plastic part was manufactured by applying a composition containing a vinyl resin as a main component on the plating layer and then irradiating 500 mJ/cm ² ultraviolet rays to form a clear layer.

Example 2

A plastic part was manufactured under the same conditions as in Example 1, except that the printing layer was formed using a silk screen.

Example 3

A plastic part was prepared under the same conditions as in Example 1, except that a composition for color coating was prepared by mixing 20 parts by weight of carbon black.

Example 4

A plastic part was prepared under the same conditions as in Example 1, except that a composition for color coating was prepared by mixing 30 parts by weight of carbon black.

Example 5

A plastic part was prepared under the same conditions as in Example 1, except that a color coating composition was prepared by mixing 0.5 parts by weight of carbon black.

Comparative Example 1

A plastic part was manufactured under the same conditions as in Example 1, except that the print layer was completely dried at 90° C. for 60 minutes.

Comparative Example 2

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

After first forming a plating layer under the chemical plating and electroplating conditions of Example 1, a laser was irradiated to form a pattern.

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

Next, plastic parts were manufactured by applying a composition containing a vinyl resin as a main component to form a clear layer.

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 having a predetermined pattern in a water bath, 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.

Subsequently, a plastic part was manufactured by applying a composition containing a vinyl resin as a main component to form a clear layer.

Comparative Example 4

A plastic part was manufactured under the same conditions as in Example 1, except that the color coating layer was not formed.

Comparative Example 5

A plastic part was manufactured under the same conditions as in Example 1, except that the printing layer was not formed.

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

Whether or not peeling occurred was marked with "O" if peeling occurred between the printed layer and the metal layer when observed with the naked eye based on the criterion of Table 1, and "X" if peeling did not occur. The visual effect of various colors was marked as "excellent" when the pattern was clear and two or more colors were observed when observed with the naked eye, and "insufficient" when the pattern formation was crushed and one color was seen.

[Table 2]

Referring to Table 2, it can be confirmed that both the visual effect of various colors and excellent adhesion can be exhibited by satisfying the manufacturing method of the plastic part of the present invention.

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.

In Comparative Example 3, peeling did not occur when observed with the naked eye, but decorativeness and design patterns were insufficient due to hydraulic transfer.

Referring to Comparative Example 4 of FIG. 13, since there was no color coating layer, the decorative feeling was insufficient when observed with the naked eye.

Comparative Example 5 of FIG. 14 appears to have only the plating color because there is no printed layer.

Therefore, the printed layer 20, the plating layer 30, and the color coating layer 40 are sequentially formed, but by satisfying the semi-drying condition of the printed layer, there is no peeling, and the color applied to the printed layer and the color coating layer are together. It can give a colorful appearance effect by expressing complex colors.

As described above, the present invention has been described with reference to the drawings illustrated, but the present invention is not limited by the embodiments and drawings disclosed in this specification, and various modifications are made by those skilled in the art within the scope of the technical idea of the present invention. It is obvious that variations can be made. In addition, although the operational effects according to the configuration of the present invention have not been explicitly described and described while describing the embodiments of the present invention, it is natural that the effects predictable by the corresponding configuration should also be recognized.

10: base material
15: primer layer
20: printing layer
30: plating layer
40: color coating layer
50: clear layer

Claims (13)

(a) preparing a base material;
(b) forming a printing layer on the base material;
(c) forming a plating layer on the printed layer;
(d) forming a color coating layer on the plating layer; and
(e) forming a clear layer on the color coating layer; including,
The (c) step of forming a plating layer on the printed layer
(c1) forming a first plating layer by chemical plating on the printed layer; and
(c2) forming a second plating layer by electroplating on the first plating layer;
According to claim 1,
In the step of forming the color coating layer,
A method for producing a plastic part by applying a composition for color coating comprising at least one polymer resin among vinyl resins, epoxy resins, polyurethane resins, acrylic resins, isocyanate resins, and polyol resins, and pigment particles.
According to claim 2,
The composition for color coating comprises 1 to 20 parts by weight of pigment particles based on 100 parts by weight of the polymer resin.
According to claim 1,
In the step of forming the printing layer, pad printing or silk screen is performed.
According to claim 1,
Method for producing a plastic part that satisfies the following formula 1 while semi-drying the print layer at 40 to 90 ° C. for 20 to 60 minutes.
[Equation 1]
80 ≤ drying temperature (℃) Χ drying time (minutes) ≤ 420
According to claim 1,
The (c1) forming a first plating layer by chemical plating on the printed layer
etching and then reducing the surface of the semi-dried printed layer;
adsorbing palladium (Pd) and tin (Sn) on the reduced surface;
removing the tin (Sn) and activating palladium (Pd); and
and forming a first plating layer by forming a nickel layer on the activated surface.
According to claim 1,
The (c2) step of electroplating on the first plating layer to form a second plating layer
forming a copper plating layer on the first plating layer;
forming a semi-bright nickel layer on the copper plating layer;
forming a bright nickel layer on the semi-bright nickel layer;
forming an MP (microporous) nickel layer on the bright nickel layer; and
and forming a second plating layer by forming a chrome plating layer on the MP nickel layer.
According to claim 1,
Between the (a) preparing a base material and (b) forming a printed layer on the base material,
The method of manufacturing a plastic part further comprising: (a1) a pretreatment step of removing foreign substances on the surface of the base material.
According to claim 8,
Between the (a1) pretreatment step of removing foreign substances on the surface of the base material and (b) the step of forming a printed layer on the base material,
The method of manufacturing a plastic part further comprising: (a2) forming a primer layer on the surface of the pretreated base material.
base material;
a printed layer disposed on the base material;
a plating layer disposed on the printed layer;
a color coating layer disposed on the plating layer; and
A clear layer disposed on the color coating layer; includes,
The plating layer includes a first plating layer and a second plating layer disposed on the first plating layer.
According to claim 10,
The color coating layer is a plastic part containing pigment particles.
According to claim 10,
The first plating layer includes a nickel layer,
The second plating layer includes a copper plating layer, a semi-bright nickel layer disposed on the copper plating layer, a bright nickel layer disposed on the semi-bright nickel layer, an MP nickel layer disposed on the bright nickel layer, and an MP nickel layer disposed on the MP nickel layer. Plastic parts including a chrome plating layer disposed on.
According to claim 10,
The base material is polycarbonate (PC), polyurethane (PU), polypropylene (PP), polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), ABS resin (acrylonitrile butadiene styrene resin), polyvinyl chloride (PVC), polybutylene terephthalate (PBT), polyethylene (PE), polyamide (PA) and PC/ABS blend Plastic parts containing one or more of the resins (polycarbonate/acrylonitrile butadiene styrene).

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