WO2020032339A1

WO2020032339A1 - Electromagnetic wave shielding material having metal thin film and liner and method for manufacturing same

Info

Publication number: WO2020032339A1
Application number: PCT/KR2019/002304
Authority: WO
Inventors: 곽규범
Original assignee: 주식회사 크린앤사이언스
Priority date: 2018-07-03
Filing date: 2019-02-26
Publication date: 2020-02-13
Also published as: KR101925258B1

Abstract

An electromagnetic wave shielding material having a metal thin film and a liner is disclosed. The electromagnetic wave shielding material comprises: (1) a substrate made of a molded article; (2) a metal thin film disposed on an inner side of the substrate; and (3) a liner formed on an inner side of the metal thin film, wherein (4) the substrate has a mounting groove for firmly mounting the metal thin film at a lower portion thereof, and an attachment hole formed at a flange thereof, wherein a gap is formed between the substrate and the liner.

Description

Electromagnetic shielding material having metal thin film and liner, and method of manufacturing same

The present invention relates to an electromagnetic wave shielding material having a metal foil and a liner and a method of manufacturing the same. More specifically, by covering the inside or the outside of the base of the molded article with a metal thin film and then attaching a thin film liner, the electromagnetic shielding material that can be mass produced in a short time with high efficiency, high strength, light weight and low cost, and a manufacturing method thereof It is about.

Recently, various electronic devices installed in aircrafts, automobiles, and ships have been adopted due to their characteristics such as convenience, high-end, light weight, slim, and hybridization. However, a large amount of harmful electromagnetic waves are emitted from these devices, causing malfunctions and safety accidents of various electronic devices to be a social problem. For the purpose of shielding electromagnetic waves, composite materials having new functionality for shielding electromagnetic waves by adding materials such as carbon, metal, and ceramics to lightweight polymer composite materials have been studied.

As a related art in this regard, Korean Patent No. 10-0990154 (2010.10.20) discloses a substrate layer in which metal nanopowder is dispersed in a nonflammable material; A first metal layer provided on one surface of the base layer; A first chromate layer provided on the first metal layer to prevent oxidation of the first metal layer; A first resin layer provided on the first chromate layer to block ultraviolet rays; And a first antistatic layer provided on the first resin layer to prevent static electricity.

Japanese Laid-Open Patent Publication No. 2009-267230 (Nov. 12, 2009) states that, in an electromagnetic shielding material, a conductive metal layer having high magnetic permeability has a small diameter in order to cover the surface of the fiber so that the clearance between the fibers is not filled. The electromagnetic wave shielding material is formed on the surface of one side or both sides of the fiber cloth to be included, the electromagnetic wave shielding material having moisture permeability, bright in weight and excellent in elasticity.

Korean Patent No. 10-460297 (2004.11.26) discloses a metal foil ribbon having a specific permeability of 1000 or more and a pressure-sensitive adhesive layer formed on at least one surface of a metal foil ribbon having a thickness of 1 to 900 µm and a width of 1 to 90 mm and a metal foil ribbon. Electromagnetic shielding material using the metal foil ribbon of the high permeability containing "is disclosed.

In addition, Patent No. 10-376960 (2003.3.08) “A method of forming a functional film for shielding electromagnetic waves on a plastic substrate, after forming a multi-layer plating film on the surface of the plastic substrate, the final electromagnetic shielding gold (Au) In order to improve the adhesion between the thin film and the plated film, a single film of each material or a combination of these films is formed by using a sputtering target made of at least one of nickel, chromium, an alloy of nickel and chromium on a multilayer plated film by a magnetron sputtering method. And a technique for depositing and forming a multilayer film formed thereon ”are disclosed.

Furthermore, Patent No. 10-707382 (2007.4.06) discloses that "the mixing ratio of the electromagnetic wave absorbing blocking material composition made of ferrite powder, which is an oxide magnetic material, compared to the mixing ratio of the synthetic resin composition, is 80 to 90% by weight or more based on the total composition of the electromagnetic wave absorber. A liquid electromagnetic wave absorber is coated to have a thickness of about 0.01 to 0.5 mm on the surface of the thin heat resistant film paper using an application roller, and then cured by passing through a drying furnace, followed by removing the heat resistant film paper, to produce a flexible thin film type electromagnetic wave absorber. Absorber ”is disclosed.

However, since the electromagnetic wave shielding materials of the prior art as described above do not meet the expected electromagnetic wave absorption and shielding efficiency, there is a limit to being widely applied to various electronic and communication devices that are light and small and small. There is a problem.

Therefore, there is an urgent need for technology development for improving the shielding rate and mass production of electromagnetic shielding materials to solve these problems.

The present invention has been invented to solve the above-mentioned problems and difficulties, high efficiency, high strength, light weight, by attaching a thin film liner after covering the inside or the outside of the base of the molded article (Base) with a metal film It is to provide an electromagnetic shielding material and a method of manufacturing the same that can be mass produced in a short time at low cost.

In order to achieve the object as described above, the present invention is 1) a substrate made of a molded article; 2) a metal thin film disposed inside the substrate; 3) a liner formed inside the metal thin film; 4) including the base material, a metal thin film and a liner, the bottom of the base is formed with a mounting groove for firmly mounting the metal thin film and the liner, the flange of the base is formed with an attachment hole, Provided is an electromagnetic shielding material having a metal thin film and a liner, wherein a gap is formed between the substrate and the liner.

In another aspect, the present invention provides a method for producing an electromagnetic shielding material having a metal thin film and a liner for manufacturing the electromagnetic shielding material.

On the other hand, the solving means of the other specific subject by this invention is described in the detailed description of this invention.

According to the electromagnetic shielding material having the metal thin film and the liner of the present invention, by attaching a thin film liner after covering the inside or the outside of the base (base) of the molded article with the metal thin film can have the advantages of high efficiency, high strength and light weight. .

In addition, the manufacturing method of the electromagnetic shielding material having a metal thin film and a liner has the advantage that it can mass-produce the electromagnetic shielding material in a short time at a low cost by a simple method.

Furthermore, there is an advantage that can be used as a new material that can overcome the limitations of the high cost and formability, which are problems of the electromagnetic wave shielding material using the present graphene, carbon nanotubes, carbon fibers and the like.

1 is a cross-sectional view and a partially enlarged view of an electromagnetic shielding material having a metal thin film and a liner of the present invention.

2 is another example of a sectional view and a partially enlarged view of an electromagnetic shielding material having a metal thin film and a liner of the present invention.

3 is an exploded view in which each component of the electromagnetic shielding material for producing the electromagnetic shielding material having the metal thin film and the liner of the present invention is disposed.

4 is a schematic block diagram illustrating a method of manufacturing an electromagnetic shielding material having a metal thin film and a liner of the present invention.

Hereinafter, with reference to the accompanying drawings an embodiment of the present invention will be described in more detail. The embodiments of the present invention can be modified in various forms, and the scope of the present invention should not be construed as being limited to the following embodiments. This embodiment is provided to more completely explain the present invention to those skilled in the art. Accordingly, the shape and detailed configuration of the elements in the drawings have been simplified for explanation. It should be noted that the terms used in the present specification are terms used to properly express preferred embodiments of the present invention.

Hereinafter, the detailed description will be described in detail with the manufacturing method and structure thereof with respect to the electromagnetic shielding material using the metal thin film which can shield the electromagnetic wave of the present embodiment as it can be used in the electromagnetic shielding material. The electromagnetic shielding material having the metal foil and the liner of the present invention and a method of manufacturing the same are not limited thereto, and may be used without limitation in various apparatuses and devices requiring electromagnetic shielding.

1 to 4, there is shown a schematic diagram of a shielding material for explaining an electric wave shielding material having a metal thin film and a liner and a method of manufacturing the same according to the present invention.

Method for producing an electromagnetic wave shielding material having a metal thin film and a liner according to the present invention comprises: 1) a first step of preparing a substrate as a molded article formed with a mounting groove at the bottom; 2) a second step of placing a metal thin film of an appropriate size inside the substrate of the first step; 3) After placing the liner inside the metal thin film of the second step, and then applying an adhesive to the flange portion of the substrate so that the substrate and the liner does not separate, and pressing with a crimping mechanism (A) A third step of mounting the metal thin film and the liner while maintaining a constant distance; 4) after the third step is characterized in that it comprises a fourth step of trimming (trimming) the edge of the metal thin film exposed to the outside.

First, the first step is a preparation step for the method of manufacturing an electromagnetic shielding material having a metal thin film and a liner according to the present invention, and is a step of preparing a substrate as a molded article formed with a mounting groove at the bottom. In more detail, according to various types of shielding material to be produced, any material capable of forming a molded article that can be used as a base (Base, 10) is possible. Among them, it is preferable to be molded into any one selected from fiber reinforced plastic (FRP), sheet molding compound (SMC), bulk molding compound (BMC), and thermoplastic resin. The mounting groove 11 may be formed at the lower end of the substrate 10 to be a molded article in order to firmly mount the metal thin film 20 and the liner 30. In addition, when the inner liner 30 is mounted inside, the flange 40 of the substrate 10 forms an attachment hole 40 for firm attachment of the shielding material.

The second step is to place a metal thin film of an appropriate size inside the substrate of the first step. In more detail, as shown in FIG. 1, the metal thin film 20 is placed in the inside of the substrate 10 prepared in the first step after cutting the metal thin film 20 to suit the size and size of the substrate 10. As the metal thin film, various kinds can be cited, but among them, it is preferable that the metal thin film is any one selected from copper, nickel, and aluminum thin films.

In the third step, the liner is placed inside the metal thin film of the second step, and then an adhesive is applied to the flange portion of the substrate so that the substrate and the liner are not separated, and then pressed by a crimping mechanism, the gap between the substrate and the liner It is a step of mounting the metal thin film and the liner while maintaining a constant distance. In more detail, as shown in FIG. 1, the liner 30 should be placed inside the metal thin film 20, and the metal thin film 20 should be positioned inside the base 10.

In addition, the liner 30, like the molded article prepared in the first step, depending on the various types of shielding material to be manufactured, any of the molded article that can be used as the liner 30 of the thin film form, but among them, fiber-reinforced plastic (FRP), sheet molding compound (SMC), bulk molding compound (BMC), preferably formed of any one selected from a thermoplastic resin. The thickness of the liner 30 in the form of the thin film is preferably 1.0 to 2.5 mm. If the thickness is less than 1.0 mm, there is a risk that the liner is too thin and breaks upon mounting. If the thickness is more than 2.5 mm, the thickness is too thick, resulting in poor adhesion.

An adhesive is applied to a flange portion that is an edge of the substrate 10 so that the substrate 10 and the liner 30 are not separated. Subsequently, the portion to which the adhesive is applied is uniformly pressed by using a pressing device such as a simple press or a pressing machine, while maintaining the distance A between the substrate 10 and the liner 30 at a predetermined distance, the metal thin film 20 And liner 30 can be mounted. At this time, the spacing (A) is preferably maintained in the range of 0.2 ~ 1.0mm, when the spacing (A) is less than 0.2mm there is a risk of damage to the metal thin film 20 when mounted, if the thickness exceeds 1.0mm metal thin film The adhesiveness of 20 may deteriorate and the quality of a shielding material may deteriorate.

The fourth step is trimming by trimming the edge portion of the metal thin film exposed to the outside after the third step. The fourth step is a finishing step of the method for manufacturing an electromagnetic shielding material having a metal thin film and a liner according to the present invention. After the third step, the edge portion of the metal thin film 20 exposed to the outside is trimmed using a knife or the like removing means. trimming) to produce a finished shielding material.

As such, the electromagnetic shielding material produced by continuously performing the processes of the first to fourth steps is relatively strongly coupled to the metal thin film 20 and the liner 30 through the mounting groove 11 formed in the substrate 10. It is possible to manufacture a product which is lightweight and has excellent mechanical properties such as strength. Furthermore, since the substrate 10 and the liner 30 made of a molded product are taken out by a press from a mold, it can be mass-produced in a short time and in a simple manner at a low cost. In view of the time required for the production of the molded article, three minutes is sufficient for sheet molding compound (SMC) and bulk molding compound (BMC) as a molding material, and ten minutes is sufficient for thermoplastic resin.

On the other hand, as shown in Figure 1 by the above production method, 1) a substrate to be a molded article; 2) a metal thin film disposed inside the substrate; 3) a liner formed inside the metal thin film; 4) including the base material, a metal thin film and a liner, the bottom of the base is formed with a mounting groove for firmly mounting the metal thin film and the liner, the flange of the base is formed with an attachment hole, It is possible to manufacture an electromagnetic shielding material having a metal thin film and a liner, wherein a gap A is formed between the substrate and the liner.

Meanwhile, in the above, the case where the liner 30 is mounted on the inside of the substrate 10 has been described in detail. On the contrary, the case where the liner 30 is mounted on the outside of the substrate 10 will be described in detail. do.

As another example of the electromagnetic wave shielding material according to the present invention, when the liner 30 is mounted on the outside of the substrate 10, the method for manufacturing the electromagnetic wave shielding material having the metal thin film and the liner includes: 1) a molded product having mounting grooves formed at a lower end thereof; Preparing a liner; 2) a second step of placing a metal thin film of an appropriate size inside the liner of the first step; 3) A substrate formed of a molded article is placed inside the metal thin film of the second step, and then an adhesive is applied to the flange portion of the liner so that the substrate and the liner are not separated, and then pressed with a crimping mechanism, between the substrate and the liner. A third step of mounting the metal thin film and the liner while maintaining the distance at a constant distance; 4) after the third step is characterized in that it comprises a fourth step of trimming (trimming) the edge of the metal thin film exposed to the outside.

First, the first step is to prepare a liner as a molded article formed with a mounting groove at the bottom. In more detail, according to various types of shielding material to be manufactured, any material capable of forming a molded article that can be used as the liner 30 can be used. Among them, it is preferable to be molded into any one selected from fiber reinforced plastic (FRP), sheet molding compound (SMC), bulk molding compound (BMC), and thermoplastic resin. The mounting groove 11 may be formed at the lower end of the liner 30 formed as a molded product in order to firmly mount the metal thin film 20 and the substrate 10. In addition, the flange of the liner 30 forms an attachment hole 40 for firm attachment of the shielding material.

The second step is to place a metal thin film of an appropriate size inside the liner of the first step. This is a case where the liner 30 is mounted on the outside of the substrate 10, and the substrate 10 is a liner (compared with the second step when the liner 30 is mounted on the inside of the substrate 10). 30) and the rest are the same, so a description thereof will be omitted.

In the third step, the substrate is placed inside the metal thin film of the second step, and then an adhesive is applied to the flange portion of the liner so that the substrate and the liner are not separated, and then pressed by a crimping mechanism, the gap between the substrate and the liner. It is a step of mounting the metal thin film and the liner while maintaining a constant distance. In more detail, as shown in FIG. 2, the liner 30 should be placed outside the metal thin film 20, and the metal thin film 20 should be located outside the substrate 10. An adhesive is applied to a flange portion that is an edge of the liner 30 so that the substrate 10 and the liner 30 are not separated. This is a case in which the liner 30 is mounted on the outside of the substrate 10, and the liner 30 may be mounted on the substrate (compared to the third step when the liner 30 is mounted on the inside of the substrate 10. 10), and the rest are the same, so a description thereof will be omitted.

The fourth step is trimming by trimming the edge portion of the metal thin film exposed to the outside after the third step. This is the same as the case in which the liner 30 is mounted inside the substrate 10, so a description thereof will be omitted.

As described above, the electromagnetic shielding material produced by continuously performing the processes of the first to fourth steps is a product having excellent mechanical properties such as light weight and strength due to the relatively strong bonding of the metal thin film 20 and the substrate 10 to the liner 30. Can be prepared. Furthermore, other effects are the same as those when the liner 30 is mounted inside the substrate 10, and thus description thereof will be omitted.

On the other hand, as shown in Figure 2 by the above manufacturing method, the electromagnetic shielding material having a metal thin film and a liner is 1) a substrate to be a molded article; 2) a metal thin film disposed outside the substrate; 3) a liner formed on the outside of the metal thin film; 4) including the base material, a metal thin film and a liner, the lower end of the liner is formed with a mounting groove for firmly mounting the metal thin film and the substrate, the flange (flange) of the liner is formed, A gap is formed between the substrate and the liner.

Hereinafter, the present invention will be described in more detail with reference to examples and drawings.

Example 1

The electromagnetic wave shielding material according to the present invention could be manufactured according to the following process.

1) Measure a sheet molding compound (SMC) with a thickness of 3.0 mm to fit the size and shape of the shielding material, insert it into a mold, press and demould, and manufacture a molded article having a mounting groove 11 and an attachment hole 40 formed thereon. It was set as (10).

2) An aluminum film foil having a thickness of 0.03 mm was cut into an appropriate shape and size to fit the substrate 10 to obtain a metal thin film 20.

3) The sheet molding compound (SMC) was weighed to fit the size and shape of the base material 10, put into a mold, pressed and demolded to form a liner 30 having a thickness of 1.5 mm.

4) The metal thin film 20 and the liner 30 are placed inside the substrate 10, and then an adhesive is applied to the flange portion of the substrate 10 so that the substrate 10 and the liner 30 are not separated. Then, while pressing at a pressure of 2 kgf / ㎠ by a simple press through the mounting groove 11 of the substrate 10 while maintaining the distance (A) between the substrate and the liner at 0.5 mm and the metal thin film 20 and The liner 30 was firmly mounted.

5) Subsequently, the edge portion of the metal thin film 20 exposed to the outside was trimmed with a knife to prepare a shielding material having a thickness of 5.0 mm.

Example 2

Compared to Example 1, instead of placing the metal thin film 20 and the liner 30 inside the substrate 10, respectively, only the point of placing the metal thin film 20 and the substrate 10 inside the liner 30, respectively. The shielding material was prepared in the same manner except for the others.

Comparative Example 1

An electromagnetic shielding material having a thickness of 0.75 mm was manufactured using a cold rolled steel sheet (SPCC).

Comparative Example 2

Resin film, metal fiber yarn, thin film aluminum, metal fiber yarn, resin film are laminated in this order, melt the resin film, compress it with a punch of press mold, harden the molten resin, and then shape it by molding 3.0mm thick using thin film aluminum. Was prepared for the electromagnetic shielding material.

Experimental Example 1 Electromagnetic Shielding Rate

The electromagnetic shielding materials prepared in Examples 1 and 2 and Comparative Examples 1 and 2 were made into reference specimens (29.7 mm × 21.0 mm), and the shielding rate was measured according to IEEE-Std-299, which is the international standard most commonly used measurement method. The results are shown in Table 1.

Experimental Example 2 Mechanical Properties

The electromagnetic wave shielding materials prepared in Examples 1, 2 and Comparative Example 2 were measured for mechanical properties such as flexural strength by KSM 3015 (general test method for thermosetting plastics), and barcol hardness and weight were measured. Is shown in Table 2.

Mechanical properties

	단위unit	실시예1 Example 1	실시예2Example 2	비교예1Comparative Example 1	비교예2Comparative Example 2	비 고Remarks
굴곡강도Flexural strength	MPaMPa	180.2180.2	180.1180.1	--	115.3115.3	o 바콜경도는 바콜 경도계 GYZJ 934-1에 의하여 측정. o Barcol hardness measured by Barcol hardness tester GYZJ 934-1.
인장강도The tensile strength	MPaMPa	90.5 90.5	90.390.3	--	67.167.1
바콜경도Bacol Hardness	--	48.1 48.1	47.947.9	--	33.133.1
중량weight	g/㎡g / ㎡	3,5083,508	3,5093,509	6,0966,096	4,4654,465

[Test Results Analysis]

According to the experimental results of Examples 1 and 2 and Comparative Examples 1 and 2, the electromagnetic wave shielding material according to the preferred embodiment of the present invention is not only light and has a laminated structure of the shielding material compared to the electromagnetic wave shielding material of Comparative Example 2, but also has flexural strength and the like. It can be seen that there is an excellent advantage in the mechanical properties and shielding rate. Furthermore, the electromagnetic shielding material according to Examples 1 and 2 has a shielding rate in the band of frequency 700 to 1400 kHz and is much lighter than the shielding material manufactured using the cold rolled steel sheet (SPCC) of Comparative Example 1, and the shielding rate is almost the same. The level was similar. In particular, since the substrate 10 and the liner 30 made of a molded article can be produced by pressing in a mold according to Examples 1 and 2, the shielding material can be mass-produced in a short time.

The present invention has been described above with reference to the embodiments shown in the drawings, but this is for illustrative purposes, and those skilled in the art to which the art belongs may have various modifications and other equivalent embodiments therefrom. Will understand. Therefore, it will be apparent that the true technical protection scope of the present invention is defined by the following claims.

Claims

1) base material which becomes a molded article;

2) a metal thin film disposed inside the substrate;

3) a liner formed inside the metal thin film;

4) including the base material, a metal thin film and a liner,

The bottom of the substrate is formed with a mounting groove for firmly mounting the metal thin film and liner,

An flange is formed on the flange of the substrate,

An electromagnetic shielding material having a metal thin film and a liner, wherein a gap is formed between the substrate and the liner.

1) base material which becomes a molded article;

2) a metal thin film disposed outside the substrate;

3) a liner formed on the outside of the metal thin film;

4) including the base material, a metal thin film and a liner,

The bottom of the liner is formed with a mounting groove for firmly mounting the metal film and the substrate,

An flange is formed on the flange of the liner,

The method according to claim 1 or 2,

The substrate or liner is an electromagnetic wave shielding material having a metal thin film and a liner, characterized in that formed of any one selected from fiber reinforced plastic (FRP), sheet molding compound (SMC), bulk molding compound (BMC), thermoplastic resin.

The method of claim 3, wherein

The metal thin film is an electromagnetic shielding material having a metal thin film and a liner, characterized in that any one selected from copper, nickel, aluminum thin film.

The method of claim 4, wherein

Electromagnetic shielding material having a metal thin film and a liner, characterized in that the thickness of the liner is 1.0 ~ 2.5mm.

The method of claim 5,

Electromagnetic shielding material having a metal thin film and a liner, characterized in that the interval is maintained in the range 0.2 ~ 1.0mm.

1) a first step of preparing a substrate as a molded article formed with a mounting groove at the bottom;

2) a second step of placing a metal thin film cut to fit the shape and size of the substrate inside the substrate of the first step;

3) Place the liner inside the metal thin film of the second step, and then apply an adhesive to the flange portion of the substrate so that the substrate and the liner do not separate, and then press with a crimping mechanism to maintain a gap between the substrate and the liner A third step of mounting the metal thin film and the liner while keeping the distance;

And 4) a fourth step of trimming and trimming the edge portion of the metal thin film exposed to the outside after the third step.

1) a first step of preparing a liner as a molded product formed with a mounting groove at the bottom;

2) a second step of placing a metal thin film cut to fit the shape and size of the liner inside the liner of the first step;

3) A substrate formed of a molded article is placed inside the metal thin film of the second step, and then an adhesive is applied to the flange portion of the liner so that the substrate and the liner are not separated, and then pressed with a crimping mechanism, between the substrate and the liner. A third step of mounting the metal thin film and the liner while maintaining the distance at a constant distance;

The method according to claim 7 or 8,

The substrate or liner of the first step is an electromagnetic wave having a metal thin film and a liner, which is formed of any one selected from fiber reinforced plastic (FRP), sheet molding compound (SMC), bulk molding compound (BMC), and thermoplastic resin. Method of manufacturing shielding material.

The method of claim 9,

The metal thin film of the second step is a method of manufacturing an electromagnetic shielding material having a metal thin film and a liner, characterized in that any one selected from copper, nickel, aluminum thin film.

The method of claim 10,

The interval of the third step is a method of manufacturing an electromagnetic shielding material having a metal thin film and a liner, characterized in that the range of 0.2 ~ 1.0mm.

The method of claim 11,

The liner thickness is 1.0 ~ 2.5mm method of manufacturing an electromagnetic shielding material having a metal thin film and a liner, characterized in that.