KR20180007216A - Metal application plastic part and Manufacturing Method thereof - Google Patents

Abstract

The present invention relates to a metal-applied plastic interior part and a manufacturing method of the metal-applied plastic interior part. The manufacturing method of the present invention includes: forming a plurality of depressions and protrusions for joining on the surface of a metal member inside the metal-applied plastic interior part; inserting the surface-treated metal member into an injection molding mold; and filling a molten plastic material into a space of the surface side within the injection molding mold to perform a process of injection molding the molten plastic material. Therefore, the manufacturing method according to the present invention manufactures an eco-friendly automobile interior part which reduces manufacturing costs and does not generate chemical odor in a vehicle by removing an adhesive, and prevents quality problems such as delamination and the like, improves quality of the metal-applied plastic interior part, and greatly lowers a failure rate by increasing the interfacial bonding strength with respect to heterojunction of metal and plastic.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a metal-

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a metal-applied plastic built-in part and a method of manufacturing the same, and more particularly, to a metal-applied plastic built-in part manufactured by firmly bonding a metal and a plastic without using an adhesive, and a manufacturing method thereof.

As well as domestic automakers, advanced automobile manufacturers are developing their own products in the high-end / large-sized car market through the application of real materials such as carbon, wood, and metals in the surface treatment methods of conventional plastic injection molding, painting, film and plating .

Particularly, interior parts of metal exterior are widely applied for building a young, sophisticated and robust vehicle image. In this case, aluminum which is light and formable is used most to prevent the weight increase of the vehicle as much as possible.

When applying real aluminum surface treatment to plastic interior parts such as garnets, moldings, and console upper cover, hot melt type adhesive is applied to the back side where aluminum comes into contact with plastic, and the parts are molded through injection of plastic material after injection.

On the other hand, in the bonding between the metal and the plastic, the adhesive acts to impart a chemical bonding force to the dissimilar materials. However, there may be a problem of peeling when the bonding force is insufficient and harmful substances such as odor / VOC may be generated due to application of the adhesive.

1 is a schematic view showing a conventional method of manufacturing a metal-applied plastic built-in part.

Referring to FIG. 1, a hot melt type adhesive 2 is applied (S20) to the back surface of the aluminum (1) after cutting (S10) to give a bonding force between the metal and the plastic, (S30), the unnecessary portions are trimmed and removed. After the caulking aluminum body 1a is mounted on the injection mold 3 (S40), the molten plastic 1b is injected on the back surface to mold the component (S50), thereby manufacturing the metal-applied plastic built-in component.

The metal-made plastic interior parts manufactured in this way maximize the sense of quality by realizing a real aluminum appearance, which is metal, on the plastic injection molding.

However, in the prior art, an adhesive is used to give a bonding force between an aluminum-plastic interface. If the adhesive strength is insufficient, there is a possibility that interfacial peeling may occur during use, and there is a possibility of detecting odor / VOC in a vehicle interior due to presence of an adhesive .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a metal-applied plastic built-in part in which a bonding force against heterogeneous bonding between a metal and a plastic is increased without using an adhesive and a manufacturing method thereof.

According to an aspect of the present invention, a metal-applied plastic built-in component includes a metal member having a plurality of concavities and convexities for bonding on its surface, and a plastic member formed by injection molding and bonded to the surface of the metal member. do.

In the present invention, the surface of the metal member may have a center line average roughness (Ra) of 2.3 to 3.2 탆.

In the present invention, the metal member may be aluminum.

In the present invention, the plastic member may be PP or PA, and may include GF as a filler.

According to an aspect of the present invention, there is provided a method of manufacturing a metal-applied plastic interior component, comprising: a surface treatment step of forming a plurality of bonding irregularities on a surface of a metal member; And an injection molding step of filling the molten plastic material into the space on the surface side in the injection molding metal mold and performing injection molding.

In the surface treatment step of the present invention, the surface of the metal member may have a center line average roughness (Ra) of 2.3 to 3.2 탆.

In the present invention, the metal member may be aluminum.

In the present invention, the plastic member may be PP or PA, and may include GF as a filler.

In the present invention, the surface treatment step may be etched with an etchant to form a plurality of minute unevenness for bonding on the surface of the metal member.

In the present invention, aluminum is used as the metal member and the surface treatment step may etch the surface of the aluminum with 4M hydrochloric acid (HCl) at 25 占 폚.

In the present invention, the surface treatment step may etch the surface of the aluminum for 5 to 6 minutes.

The present invention has the effect of manufacturing an environmentally friendly automotive interior part in which the adhesive is removed to reduce the cost and the chemical odor of the interior of the vehicle is not generated.

The present invention increases the interfacial bonding force for heterogeneous bonding of metal and plastic to prevent quality problems such as peeling, improve the quality of metal-incorporated plastic parts, and significantly reduce the defect rate.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a conventional method for manufacturing a metal-applied plastic built-in component. Fig.
2 is a sectional view showing an embodiment of a metal-applied plastic built-in part according to the present invention;
3 is a process diagram showing an embodiment of a method for manufacturing a metal-applied plastic built-in part according to the present invention.
4 is a schematic view showing an embodiment of a method for manufacturing a metal-applied plastic built-in part according to the present invention.
5 is a graph showing the average surface roughness versus time in the etching process in the method of manufacturing the metal-applied plastic built-in part according to the present invention.
6 is a scanning electron microscope photograph showing the change of surface roughness of aluminum during the etching process in the method of manufacturing a metal-applied plastic built-in part according to the present invention.

The present invention will now be described in detail with reference to the accompanying drawings. Hereinafter, a repeated description, a known function that may obscure the gist of the present invention, and a detailed description of the configuration will be omitted. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity.

FIG. 2 is a cross-sectional view illustrating an embodiment of a metal-applied plastic built-in part according to the present invention. Referring to FIG. 2, an embodiment of a metal- And a plurality of metal members 10 formed thereon.

The metal member 10 is made of aluminum. The aluminum member is lightweight and does not increase the weight of the vehicle body, and is excellent in moldability.

It is noted that the metal member 10 may be modified to be made of any metal material that can be used as an internal part for automobiles.

 A plurality of bonding irregularities 11 are formed on the surface of the metal member 10, and the plastic member 20 is bonded.

The plastic member 20 is formed by injection-molding synthetic resin material, that is, plastic, and is bonded to the surface of the metal member 10.

The surface of the metal member 10 has a center line average roughness (Ra) of 2.3 to 3.2 탆.

The surface of the metal member 10 may be formed of a composite material of PA6-GF33, PA6, PA6-GF10, PA6-GF20, PA6-GF30 and PA6-GF40, It was confirmed that the bonding force was improved to 70% or more when using PP (polypropylene) and PP (polypropylene) -GF (glass fiber) composites by using a roughness (Ra) of 2.3 to 3.2 탆 .

The plastic member 20 is injection molded and directly bonded to the surface of the metal member 10, that is, the surface on which the plurality of bonding irregularities 11 are formed.

FIG. 3 is a process diagram showing one embodiment of a method for manufacturing a metal-applied plastic built-in part according to the present invention, and FIG. 4 is a schematic view showing an embodiment of a method for manufacturing a metal-applied plastic built-in part according to the present invention.

Referring to FIGS. 3 and 4, a method for manufacturing a metal-applied plastic built-in component according to an embodiment of the present invention includes: a plastic member S100 for forming a plurality of joining irregularities 11 on a surface of a metal member 10; And an injection molding step (S200) of inserting the surface-treated metal member (10) into an injection molding metal mold, filling a space on the surface side in the injection molding metal mold with a molten plastic material and injection molding.

The plastic member S100 is etched with an etching solution to form a plurality of fine bonding irregularities 11 on the surface of the metal member 10 as an example.

The metal member 10 is made of aluminum, and the etchant is, for example, 4M hydrochloric acid (HCl).

The surface of the metal member 10 is formed to have a center line average roughness (Ra) of 2.3 to 3.2 탆 in the plastic member S100.

The plastic member S100 may be surface-treated by sand blasting or polishing, or may be formed by any known surface treatment method capable of forming the surface of the metal member 10 at a center line average roughness (Ra) of 2.3 to 3.2 탆 It will be understood that various modifications may be made without departing from the spirit and scope of the invention.

The injection molding step S200 includes a metal insert step S210 for inserting the metal member 10 which has been surface-treated in the injection molding metal so that an injection molding space can be formed on the surface side of the metal member 10, And an injection molding process (S220) of injecting molten plastic material into the injection molding cavity in the injection molding die and injection molding the plastic member 20 to be joined to the surface of the metal member (10).

Table 1 below shows the relationship between the etching time of the metal member 10 on the surface of the metal member 10 when etching the surface of the metal member 10 with 4M hydrochloric acid (HCl) at 25 캜 using the metal member 10, 5 is a graph showing the centerline average roughness Ra of the metallic member 10 according to the present invention. FIG. 5 is a graph showing the center line average roughness Ra of the metal member 10, (Ra) at the surface of the metal member 10 with respect to the etching time when the surface of the metal member 10 is etched. 6 is a schematic view showing a method of manufacturing a metal-made plastic interior part according to the present invention when aluminum is used as the metal member 10 and the surface of the metal member 10 is etched with 4M hydrochloric acid (HCl) at 25 ° C And a change in the surface roughness of aluminum with the etching time.

Etching time (min) Center line average roughness (Ra, 탆)  division 0 0.27 Comparative Example 1 One 0.27 Comparative Example 2 2 0.28 Comparative Example 3 3 0.4 Comparative Example 4 4 0.62 Comparative Example 5 5 2.5 Example 1 6 3 Example 2 7 1.5 Comparative Example 6 8 1.1 Comparative Example 7

In Table 1, the aluminum of Comparative Example 1 is unetched and has a centerline average roughness (Ra) of 0.27 탆 at a level of 0.27 탆 because no surface is etched. As the etching progresses, a plurality of bonding irregularities 11 are formed on the aluminum surface And the value of the centerline average roughness (Ra) increases.

5 and 6, the centerline average roughness (Ra) of the surface of the aluminum is the maximum value at a level of 5 to 6 minutes when the surface of the aluminum is etched with 4M hydrochloric acid (HCl) at 25 ° C And it was confirmed that the interface specific surface area with the plastic member 20 to be injected thereafter is the largest. On the other hand, when aluminum is used and the surface of the aluminum is etched with 4M hydrochloric acid (HCl) at 25 DEG C, etching is further excessively performed at the portion of the concave and convex portions 11 for bonding which are formed after 7 minutes, (Pitting → roughening) and the center line average roughness (Ra) tend to decrease. Therefore, it is most preferable to etch the surface of aluminum at 5 占 폚 with 4M hydrochloric acid (HCl) for 5 to 6 minutes. .

Table 2 below shows the bonding strength of each aluminum-plastic combination. The aluminum was etched with 4M hydrochloric acid (HCl) at 25 캜 for 6 minutes, and the plastic was injection-molded on the surface of the etched aluminum to determine the kind of the plastic member 20 The results are shown in Fig. In Table 2 below, it is found that PA6 is Polyamide6, GF is Glass fiber, PP is Polypropylene, MAPP is Maleic anhydride-grafted PP, and the numbers indicate the content (wt%).

Item Bond strength (MPa) Remarks plastic Filler Aluminum etching glue PA6 GF33 × ○ 3.2 Comparative Example 8 PP - × ○ 3.3 Comparative Example 9 PP - ○ × 0.4 Comparative Example 10 PP MAPP4 ○ × 1.2 Comparative Example 11 PA6 - ○ × 5.6 Example 3 PA6 GF10 ○ × 5.7 Example 4 PA6 GF20 ○ × 5.8 Example 5 PA6 GF30 ○ × 5.8 Example 6 PP MAPP4 + GF30 ○ × 4.8 Example 7 PP MAPP6.5 + GF30 ○ × 5.2 Example 8 PP MAPP9 + GF30 ○ × 5.3 Example 9 PP MAPP14 + GF30 ○ × 5.4 Example 10

As can be seen from the above Table 2, it can be confirmed that the plastic member 20 is preferably PP or PA, and it is preferable that GF is included as a filler.

The present invention provides an environmentally friendly automotive interior part which eliminates the adhesive to reduce the cost and does not cause chemical odors in the interior of the vehicle.

The present invention increases the interfacial bonding force between the metal and the plastic for hetero-bonding, prevents quality problems such as peeling, improves the quality of metal-incorporated plastic parts, and significantly reduces the defect rate.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the above teachings. will be.

10: metal member 11: concave and convex for joining
20: plastic member S100: surface treatment step
S200: injection molding step S210: mold insertion process
S220: Injection molding process

Claims (11)

A metal member having a plurality of bonding irregularities formed on its surface; And
And a plastic member molded by injection molding and bonded to the surface of the metal member. The method according to claim 1,
Wherein a surface of the metal member has a centerline average roughness (Ra) of 2.3 to 3.2 占 퐉. The method according to claim 1,
Wherein the metal member is aluminum. The method according to claim 1,
Wherein the plastic member is PP or PA, and the filler comprises GF. A surface treatment step of forming a plurality of bonding irregularities on the surface of the metal member; And
And an injection molding step of inserting the surface-treated metal member into the injection-molding mold and filling the space on the surface side in the injection-molding mold with molten plastic material and performing injection molding. Way. The method of claim 5,
Wherein the surface treatment step comprises forming a surface of the metal member with a center line average roughness (Ra) of 2.3 to 3.2 占 퐉. The method of claim 5,
Wherein the metal member is aluminum. The method of claim 5,
Wherein the plastic member is PP or PA and the filler comprises GF. The method of claim 5,
Wherein the surface treatment step is performed by etching with an etchant to form a plurality of minute unevenness for bonding on the surface of the metal member. The method of claim 9,
Wherein aluminum is used as the metal member and the surface of the aluminum is etched with 4M hydrochloric acid (HCl) at 25 캜. The method of claim 10,
Wherein the surface treatment step comprises etching the surface of the aluminum for 5 to 6 minutes.

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