KR20210103413A - Multifunctional composite film having heat dissipation and electronmagnetic shielding/absorption cpapticy and method for manufacturing thereof - Google Patents

Abstract

The present invention relates to a multifunctional composite film having a novel type of heat dissipation and electromagnetic wave shielding/absorbing ability, and a manufacturing method thereof. More specifically, the present invention relates to in having an effect of providing a composite film having a high heat dissipation property in an in-plane direction and a surface-transmitting direction, and at the same time, having an electromagnetic wave shielding and absorbing capabilities. The multifunctional composite film comprises: a polymer matrix layer; and a metal mesh.

Description

Multifunctional composite film having heat dissipation and electromagnetic wave shielding/absorbing ability and manufacturing method thereof

The present invention relates to a multifunctional composite film having a novel type of heat dissipation and electromagnetic wave shielding/absorbing ability and a manufacturing method thereof, and more particularly, has high heat dissipation in the in-plane direction and the surface transmission direction, and at the same time, electromagnetic wave It relates to a composite film having shielding and absorption capabilities.

Recently, as electronic products are highly integrated, internal electromagnetic interference has become a problem, and in the case of next-generation communication, as the communication frequency gradually has a higher frequency, communication radio waves coming from the outside also become a cause of electromagnetic interference. In addition, in the case of materials used inside electronic products, it is important to remove electromagnetic interference, but the problem of relieving heat due to integration is also emerging. Heat generation is also one of the emerging problems of electronic device failure, as it may cause malfunction due to overheating. Therefore, the demand for multifunctional materials that have heat dissipation properties and shield or absorb electromagnetic waves at the same time is a trend that is increasing significantly. Related products that are being mainly sold at this time include films with specific functions, not multifunctionality, such as heat dissipation films, electromagnetic wave shielding films, and electromagnetic wave absorption (attenuation) films. It is being used.

Currently commercialized related technology products include heat dissipation sheet, heat dissipation paste, electromagnetic wave shielding film, and electromagnetic wave absorbing film. The heat dissipation sheet is a mixture of a high heat dissipation material, such as a carbon material (diamond, graphite, carbon black, carbon nanotube, etc.) and a ceramic material (aluminum nitride, alumina, boron nitride, etc.), with a polymer as a matrix. Electromagnetic wave shielding film is an electrically conductive material carbon material (graphite, carbon black, carbon nanotube, etc.) or metal material (copper, silver, etc.) composited with a polymer as a matrix. Due to its characteristics, it is difficult to apply where insulation is required. The electromagnetic wave absorbing film is made by mixing a magnetic material with a polymer as a matrix, and a metal material (Fe, FeCo, etc.) or a ceramic material (Fe ₂ O ₃ , NdFeB, etc.) is used as the magnetic material. However, in the case of each of these materials, only one function is provided, and materials having multifunctional functions such as heat dissipation and electromagnetic wave shielding or heat dissipation and electromagnetic wave absorption are not commercially available, so the necessity is emerging.

In addition, according to the functional and material requirements of advanced materials such as light weight and thin film, the demand for multifunctional materials that have heat dissipation and electromagnetic wave shielding/absorbing properties at the same time is increasing. In order to do this, it is necessary to develop a technology capable of synthesizing materials at low temperatures, excluding high-vacuum and high-temperature processes, which have high process costs. The currently developed and commercialized product is a single functional product with only one function of heat dissipation, electromagnetic wave shielding, or electromagnetic wave absorption. Therefore, there is a need for research on a multifunctional material having the above performance for light weight and thin film.

Republic of Korea Patent Publication No. 10-2019-0124653 (2019.11.05)

The object of the present invention is to exclude high vacuum and high temperature processes with high process costs by manufacturing them using inorganic particles having heat dissipation properties, magnetic particles having electromagnetic wave shielding/absorbing ability, polymers and conductive metal meshes, and can be manufactured at low temperatures. , It is an object of the present invention to provide a multifunctional composite film capable of shielding and absorbing electromagnetic waves of various frequencies while having heat dissipation properties by minimizing the use of expensive materials per unit area.

In order to achieve the object to be solved, the heat dissipation-electromagnetic wave shielding/absorbing composite film of the present invention includes a polymer matrix layer in which a magnetic filler is dispersed; and a metal mesh impregnated in the polymer matrix layer.

The metal mesh may be exposed on one side of the composite film.

With respect to the polymer matrix layer, a heat dissipation filler may be additionally dispersed.

The material of the metal mesh may be copper (Cu), silver (Ag), aluminum (Al), nickel (Ni), gold (Au), or iron (Fe).

The magnetic filler may be one or two or more selected from the group consisting of Fe, an Fe-based alloy, M-type hexaferrite, and a magnetic material substituted with M-type hexaferrite.

The heat dissipation filler is graphite, graphene, carbon nanotube, carbon black, nano diamond, hexagonal boron nitride (h-BN), cubic boron nitride (c-BN), boron nitride nanotube, aluminum nitride (AlN) and It may be 1 or 2 or more selected from the group consisting of alumina (Al ₂ O _{3 ).}

The polymer is high-density polyethylene (HDPE), linear low-density polyethylene, low-density polyethylene, polyvinyl alcohol (polyvinyl alcohol), polyvinyl difluoride (PVDF), polyethylene terephthalate (PET), poly It may be one or two or more selected from the group consisting of butylene terephthalate (PBT), poly dimethyl siloxane, poly silazane, and poly siloxane.

The composite film may have a thickness of 1 μm to 10 mm.

Diameters of the magnetic filler and the heat dissipation filler may be smaller than the thickness of the composite film.

In addition, the heat dissipation-electromagnetic wave shielding/absorption method of the composite film of the present invention is provided by dispersing a magnetic filler on a polymer matrix to prepare a mixed composite; filming the composite; and impregnating a metal mesh onto the filmed composite.

With respect to the polymer matrix, a heat dissipation filler may be additionally dispersed.

The material of the metal mesh may be copper (Cu), silver (Ag), aluminum (Al), nickel (Ni), gold (Au), or iron (Fe).

The magnetic filler may be one or two or more selected from the group consisting of Fe, an Fe-based alloy, M-type hexaferrite, and a magnetic material substituted with M-type hexaferrite.

The heat dissipation filler is graphite, graphene, carbon nanotube, carbon black, nano diamond, hexagonal boron nitride (h-BN), cubic boron nitride (c-BN), boron nitride nanotube, aluminum nitride (AlN) and It may be 1 or 2 or more selected from the group consisting of alumina (Al ₂ O _{3 ).}

The polymer is high-density polyethylene (HDPE), linear low-density polyethylene, low-density polyethylene, polyvinyl alcohol (polyvinyl alcohol), polyvinyl difluoride (PVDF), polyethylene terephthalate (PET), poly It may be one or two or more selected from the group consisting of butylene terephthalate (PBT), poly dimethyl siloxane, poly silazane, and poly siloxane.

According to an embodiment of the present invention, the composite film of the present invention has heat dissipation characteristics and electromagnetic wave absorption characteristics by uniformly mixing a magnetic filler and a heat dissipation filler on a polymer matrix, and a metal mesh is dispersed on a polymer matrix (dispersion medium) By having electromagnetic wave shielding and heat dissipation properties, it has high heat dissipation in the in-plane direction and the surface transmission direction, and at the same time, there is an effect of providing a composite film having electromagnetic wave shielding and absorbing ability.

In addition, according to an embodiment of the present invention, the composite film of the present invention is prepared by dispersing and mixing a magnetic filler and a heat dissipating filler on a polymer matrix (dispersion medium) by a melt mixing method, and then impregnating a metal mesh on the polymer matrix to process cost This is reduced, and each separate stacking according to the heat dissipation or shielding/absorbing function is not required, so there is an effect of reducing the weight and reducing the thickness.

In addition, according to an embodiment of the present invention, the composite film of the present invention has the effect that it is possible to optimize the characteristics for each frequency, so that it can be applied to various demanding places requiring electromagnetic wave shielding/absorbing ability and heat dissipation characteristics at the same time.

1 shows a plan view (upper image) and a cross-sectional view (down image) of a composite film having a heat dissipation-electromagnetic wave shielding/absorbing ability according to an embodiment of the present invention.
2 is a heat dissipation according to an embodiment of the present invention-shows a manufacturing process of a composite film equipped with electromagnetic wave shielding/absorbing ability.
3 shows a scanning electron microscope (SEM) image of a cross-section of a composite film with heat dissipation-electromagnetic wave shielding/absorption ability manufactured by a melt mixing method according to an embodiment of the present invention.
4 is a heat dissipation according to an embodiment of the present invention - shows an optical image of a cross-section of the metal mesh (copper mesh) of the composite film with electromagnetic wave shielding/absorbing ability is exposed.
Figure 5 shows the electromagnetic wave shielding and absorption performance results for the metal mesh-polymer composite according to a comparative example of the present invention.
6A to 6D show results of electromagnetic wave shielding and absorption performance of a composite film having heat dissipation-electromagnetic wave shielding/absorbing ability according to an embodiment of the present invention.
7 is a heat dissipation according to an embodiment of the present invention - shows the heat dissipation performance results of the composite film provided with electromagnetic wave shielding / absorption.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and the contents described in the accompanying drawings, but the present invention is not limited or limited by the embodiments.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. As used herein, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, "comprises" and/or "comprising" refers to the presence of one or more other components, steps, operations and/or elements mentioned. or addition is not excluded.

As used herein, “embodiment”, “example”, “aspect”, “exemplary”, etc. are to be construed as advantageous in which any aspect or design described is preferred or advantageous over other aspects or designs. it is not doing

The terms used in the description below are selected as general and universal in the related technical field, but there may be other terms depending on the development and/or change of technology, customs, preferences of technicians, and the like. Therefore, the terms used in the description below should not be understood as limiting the technical idea, but should be understood as exemplary terms for describing the embodiments.

In addition, in a specific case, there is a term arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the corresponding description. Therefore, the terms used in the description below should be understood based on the meaning of the term and the content throughout the specification, not the simple name of the term.

Meanwhile, terms such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

In addition, when a part such as a film, layer, region, configuration request, etc. is “on” or “on” another part, not only when it is directly on the other part, but also another film, layer, region, configuration in the middle The case where an element, etc. is interposed is also included.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless specifically defined explicitly.

Meanwhile, in describing the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. And, the terms (terminology) used in this specification are terms used to properly express the embodiment of the present invention, which may vary according to the intention of the user or operator, or customs in the field to which the present invention belongs. Accordingly, definitions of these terms should be made based on the content throughout this specification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 is a plan view (upper image) and cross-sectional view (down image) of a composite film equipped with a heat dissipation-electromagnetic wave shielding/absorbing ability of the present invention, and FIG. 2 is a heat dissipation-electromagnetic wave shielding of the present invention. / It shows a process diagram of a manufacturing method of a composite film equipped with absorption capacity.

Referring to FIG. 1 , the heat dissipation-electromagnetic wave shielding/absorbing composite film 100 of the present invention includes a polymer matrix layer 110 in which a magnetic filler is dispersed; and a metal mesh 130 impregnated on the polymer matrix layer 110 .

The polymer matrix layer 110 may be dispersed by additionally adding a heat dissipation filler. More specifically, as a magnetic filler having electromagnetic wave shielding/absorbing properties in the polymer matrix layer 110, as a heat dissipation filler having magnetic particles and heat dissipation properties, inorganic particles may be dispersed and uniformly mixed, in this case, the composite film 100 ), a ceramic filler having a low dielectric characteristic may be added to the polymer matrix layer 110 to control the dielectric constant.

Due to the uniform mixing of the magnetic filler and the heat dissipating filler dispersed on the polymer matrix layer 110 , the composite film 100 may provide heat dissipation properties and electromagnetic wave absorption capability.

The metal mesh 130 may provide electronic vehicle shielding and heat dissipation properties to the composite film 100 through electrical conductivity, and the material of the metal mesh 130 is copper (Cu), silver (Ag), aluminum (Al). , may be nickel (Ni), gold (Au) or iron (Fe), preferably a material having high thermal conductivity of the metal itself, more specifically copper (Cu), silver (Ag) or aluminum ( Al), and more preferably copper (Cu).

The magnetic filler may be one or two or more selected from the group consisting of Fe, Fe-based alloys, M-type hexaferrite and M-type hexaferrite-substituted magnetic materials, and the Fe-based alloy is FeCo, FeNi or FeCoNi. and M-type hexaferrite may be Sr _x Fe _y O _z or Ba _x Fe _y O _z . More preferably, the magnetic filler may be spherical Fe or SrFe ₁₂ O ₁₉ .

The heat dissipation filler is a surface-modified one, and the heat dissipation filler may be graphite, graphene, carbon nanotube, carbon black, or nanodiamond, which is a carbon-based material, and the heat dissipation filler is a non-carbon-based material h-BN, c- It may be BN, boron nitride nanotubes, aluminum nitride (AlN) or alumina (Al ₂ O ₃ ). Therefore, the heat dissipation filler is graphite, graphene, carbon nanotube, carbon black, nano diamond, hexagonal boron nitride (h-BN), cubic boron nitride (c-BN), boron nitride nanotube, aluminum nitride (AlN) ) and alumina (Al ₂ O ₃ ) may be one or two or more selected from the group consisting of, and more preferably, hexagonal boron nitride (h-BN).

The polymer of the polymer matrix layer 110 may be any carbon-based polymer such as a PE-based polymer, a vinyl-based polymer, or an ester-based polymer, and may be a silicone-based polymer. In this case, the PE-based polymer may be one or two or more selected from the group consisting of high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), and low-density polyethylene (LDPE), and the vinyl-based polymer is polyvinyl alcohol (Poly vinyl alcohol) and / or polyvinyl difluoride (Poly vinyl difluoride), the ester-based polymer may be polyethylene terephthalate (PET) and / or polybutylene terephthalate (Poly butylene terephthalate; PBT), silicone-based The polymer may be one or two or more selected from the group consisting of poly dimethyl siloxane, poly silazane, and poly siloxane. More preferably, the polymer may be high density polyethylene (HDPE).

Accordingly, the polymer of the polymer matrix layer 110 is high density polyethylene (HDPE), linear low density polyethylene (LLDPE), low density polyethylene (LDPE), polyvinyl alcohol (polyvinyl alcohol), polyvinyl difluoride (PVDF). ), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polydimethylsiloxane, polysilazane, and polysiloxane. It may be 1 or 2 or more selected from the group, and preferably 1 or 2 or more selected from the group consisting of high-density polyethylene, linear low-density polyethylene, and polydimethyl siloxane, which are polymers with high thermal conductivity, and more Preferably, it may be high density polyethylene (HDPE).

The thickness of the composite film 100 may be 1 μm to 10 mm.

Diameters of the magnetic filler and the heat dissipation filler may be smaller than the thickness of the composite film 100 .

The heat dissipation-electromagnetic wave shielding/absorbing composite film 100 of the present invention is a heat dissipation filler, and the type of inorganic particles, the type of magnetic filler (magnetic particle), the type of low-k filler, the type of polymer, the size of the conductive metal mesh It is possible to change factors such as, and thus, it is possible to provide a composite film having heat dissipation characteristics and electromagnetic wave shielding/absorbing ability according to the purpose or use.

Furthermore, heat dissipation and electromagnetic wave shielding through control of the thickness of the composite film 100, control of the type and content of the filler in the polymer matrix layer 110, the size of holes in the metal mesh 130 and the thickness of the wire, etc. /Absorbability can be adjusted.

In addition, referring to Figure 2, the heat dissipation of the present invention - the method of manufacturing a composite film having electromagnetic wave shielding/absorbing ability comprises the steps of dispersing a magnetic filler on a polymer matrix to prepare a mixed composite (S110); Filming the composite (S130); and impregnating the metal mesh on the filmed composite (S150).

Step S110 may be to prepare a composite according to a melt mixing method, and a heat dissipation filler may be additionally dispersed in the polymer matrix.

Step S110 may be to melt each of the magnetic filler, the heat dissipation filler, and the polymer to disperse and mix the polymer, in this case, the melting may be performed at 160 ℃.

Step S130 may be forming into a film (film formation) through a hot compaction process, and the thermal compression process in step S130 may be performed at a temperature of 180° C. and a pressure of 5 MPa.

Step S150 may be to compound the composite and the metal mesh by a hot compaction process on the metal mesh on the filmed composite.

The material of the metal mesh may be copper (Cu), silver (Ag), aluminum (Al), nickel (Ni), gold (Au) or iron (Fe), preferably a material having high thermal conductivity of the metal itself. may be, and more specifically, may be copper (Cu), silver (Ag), or aluminum (Al), and more preferably copper (Cu).

The magnetic filler may be one or two or more selected from the group consisting of Fe, Fe-based alloys, M-type hexaferrite and M-type hexaferrite-substituted magnetic materials, and the Fe-based alloy is FeCo, FeNi or FeCoNi. and M-type hexaferrite may be Sr _x Fe _y O _z or Ba _x Fe _y O _z . More preferably, the magnetic filler may be spherical Fe or SrFe ₁₂ O ₁₉ .

The heat dissipation filler is a surface-modified one, and the heat dissipation filler may be graphite, graphene, carbon nanotube, carbon black, or nanodiamond, which is a carbon-based material, and the heat dissipation filler is a non-carbon-based material h-BN, c- It may be BN, boron nitride nanotubes, aluminum nitride (AlN) or alumina (Al ₂ O ₃ ). Therefore, the heat dissipation filler is graphite, graphene, carbon nanotube, carbon black, nano diamond, hexagonal boron nitride (h-BN), cubic boron nitride (c-BN), boron nitride nanotube, aluminum nitride (AlN) ) and alumina (Al ₂ O ₃ ) may be one or two or more selected from the group consisting of, and more preferably, hexagonal boron nitride (h-BN).

The polymer of the polymer matrix layer 110 may be any carbon-based polymer such as a PE-based polymer, a vinyl-based polymer, or an ester-based polymer, and may be a silicone-based polymer. In this case, the PE-based polymer may be one or two or more selected from the group consisting of high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), and low-density polyethylene (LDPE), and the vinyl-based polymer is polyvinyl alcohol (Poly vinyl alcohol) and / or polyvinyl difluoride (Poly vinyl difluoride), the ester-based polymer may be polyethylene terephthalate (PET) and / or polybutylene terephthalate (Poly butylene terephthalate; PBT), silicone-based The polymer may be one or two or more selected from the group consisting of poly dimethyl siloxane, poly silazane, and poly siloxane. More preferably, the polymer may be high density polyethylene (HDPE).

Accordingly, the polymer of the polymer matrix layer 110 is high density polyethylene (HDPE), linear low density polyethylene (LLDPE), low density polyethylene (LDPE), polyvinyl alcohol (polyvinyl alcohol), polyvinyl difluoride (PVDF). ), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polydimethylsiloxane, polysilazane, and polysiloxane. It may be 1 or 2 or more selected from the group, and preferably 1 or 2 or more selected from the group consisting of high-density polyethylene, linear low-density polyethylene, and polydimethyl siloxane, which are polymers with high thermal conductivity, and more Preferably, it may be high density polyethylene (HDPE).

The heat dissipation-electromagnetic wave shielding/absorption method of the composite film of the present invention can be performed by a roll-to-roll method, The manufacturing method is suitable for mass production because it is possible to produce a composite film according to the roll-to-roll method.

For this reason, the heat dissipation-electromagnetic wave shielding/absorption method of the present invention can reduce the process cost, and the composite film having heat dissipation and electromagnetic wave shielding/absorbing ability can be synthesized in large quantities by an easy process method, By controlling the thickness of the composite film, controlling the type and content of fillers in the composite film, adjusting the hole size and metal mesh wire thickness in the metal mesh, etc., it is possible to produce a composite film by controlling the heat dissipation and electromagnetic wave shielding/absorbing ability.

Hereinafter, the present invention will be described in more detail through examples. These Examples are for explaining the present invention in more detail, and the scope of the present invention is not limited by these Examples.

Example 1.

A heat dissipation and electromagnetic wave absorbing composite by melting and mixing 50 vol% of spherical Fe particles (magnetic filler) with 50 vol% of high-density polyethylene (HDPE), each of which is a polymer, at 160 ° C. was prepared.

The prepared composite was made into a film (composite film) through a hot compaction process under conditions of 180 °C (temperature) and 5 MPa (pressure), and the thickness of the composite film was fixed at 0.5 mm.

After placing a copper (Cu) mesh (a copper (Cu) wire diameter of 0.1 mm, a mesh hole size (diameter) of 0.15 mm) on the prepared composite film, a thermocompression bonding process was performed, and one side A composite film was prepared in which a copper mesh was impregnated on one side of the composite film, and the copper mesh was exposed on the other side.

On the other hand, when a copper (Cu) mesh is laminated on the composite film prepared in Example 1, and then another composite film is laminated on the laminated copper mesh to proceed with the thermocompression bonding process, both one side and the other side of the copper mesh is impregnated on the composite film to prepare a copper mesh in which the copper mesh is not exposed.

Example 2.

The same procedure as in Example 1, except that 10 vol% of surface-modified hexagonal boron nitride (h-BN) (heat dissipation filler), 50 vol% of spherical Fe particles (magnetic filler) and a polymer of 40 A heat dissipation and electromagnetic wave absorbing composite was prepared by a melt mixing method in which vol% of high density polyethylene (HDPE) and each were melted at 160 ° C., dispersed and mixed.

Example 3.

Same as in Example 2, except that 10 vol% of surface-modified hexagonal boron nitride (h-BN) (heat dissipation filler), 50 vol% of SrFeO ferrite (SrFe ₁₂ O ₁₉ ) (magnetic filler) ) and a polymer of 40 vol% high density polyethylene (HDPE), respectively, melted at 160 °C, dispersed and mixed to prepare a heat dissipation and electromagnetic wave absorbing composite.

comparative example.

A PDMS/copper mesh composite film was prepared by impregnating a copper mesh on PDMS (Poly-(dimethylsiloxane)) having a thickness of 0.3 mm as a polymer.

experimental example. Morphology analysis

The cross-section of the composite film having heat dissipation-electromagnetic wave shielding/absorption ability prepared by the melt mixing method in Examples 1 to 3 was observed using a scanning electron microscope (SEM), and the observed SEM image is shown in FIG. 3 shown in

experimental example. Optical Image Analysis

One side (the other side) to which the copper mesh is exposed among any one of the composite films prepared in Examples 1 to 3 is shown as an optical image, which is shown in FIG. 4 .

experimental example.

With respect to the PDMS/copper mesh composite film prepared in the comparative example, a simulation was performed to measure the electromagnetic wave shielding ability and absorption capacity according to the electromagnetic wave shielding absorption computational schematic diagram shown in FIG. 5, and the results are shown in FIG. did.

As shown in Figure 5, the copper mesh of the PDMS / copper mesh composite film prepared in the comparative example, based on the unit cell (unit cell), the electrical conductivity (σ) of copper is 5.8 × 10 ⁷ S / m, The width (w) of the mesh (grid) is 100 μm, the period (p) of the mesh (grid) is 250 μm, and the thickness (t) of the mesh (grid) is 100 μm , and the thickness (t) of PDMS (ε: 3.5, tan δ: 0.01) is 300 μm.

5, a simple copper mesh and be complexed only PDMS as the polymer electromagnetic wave shielding ability (SE _R) and the electromagnetic wave absorption capability (SE _A) is more than 30 dB, respectively, the total electromagnetic wave shielding ability (SE _T) is more than 60 dB It can be confirmed that it has

experimental example. Analysis of electromagnetic wave shielding and absorption performance

The electromagnetic wave shielding and absorption characteristics (performance) of the composite films prepared in Examples 1 to 3 were specified, and the electromagnetic wave shielding ability ( The shielding effectiveness (SE) including both reflection) and electromagnetic wave absorption was measured, and as a control, the shielding effect (SE) including the electromagnetic wave shielding ability and electromagnetic wave absorption capacity of the copper mesh itself was also measured. 6a to 6d (Fig. 6a: Example 1 (Fe50_HDPE_Cu mesh, Fig. 6b: Example 2 (Fe50_h-BN_HDPE_Cu mesh)), Fig. 6c: Example 3 (Sr-Fe50_h-BN_HDPE_Cu mesh), Fig. 6d: Cu mesh) In FIGS. 6a to 6d , the electromagnetic wave shielding ability was expressed as SE _reflection and the electromagnetic wave absorption ability was _{expressed as SE absorption} , and the shielding effect including the electromagnetic wave shielding ability and the electromagnetic wave absorption ability was expressed as SE _total .

Even in the case of using only a copper mesh (see FIG. 6d ), it shows a _{high electromagnetic wave shielding effect (SE total ) of about 45 dB or more, but it can be seen that the return loss (SE reflction} ) also appears as large as about 10 dB. .

On the other hand, in the case of Examples 1 to 3 (see FIGS. 6a to 6c ), the total electromagnetic wave shielding effect (SE total; full line) of the surface (the other side) on which the copper mesh is exposed is the copper mesh with a polymer (HDPE). ), the surface (the entire electromagnetic wave shielding effect of the one side) (SE total; the dotted line (dotted line) impregnated into one) and similar, the electromagnetic wave absorption capability (SE _absoprtion) has a surface (surface side) impregnated with a polymer (HDPE) (dotted line ( It can be seen that the dotted line) appears higher than the exposed surface (the other side) (full line) of the copper mesh.

to the experiment. Heat dissipation performance analysis

In Examples 1 to 3, with respect to the composite (without mesh) before the copper mesh and composite (impregnation), and the composite film (with mesh) composite (impregnated) with the copper mesh, the surface transmission direction thermal conductivity (Thermal Conductivity) ) was measured using a thermal wave method, and the results are shown in FIG. 7 .

7 (Example 1: Fe 50vol%, Example 2: CIP 50vol%_h-BN 10vol%, Example 3: SrFe ₁₂ O- ₁₉ 50vol%_h-BN 10vol%), as a heat dissipation filler h- In the case of the composite (without mesh) of Example 1 that does not contain BN, it has a very low heat dissipation characteristic at 0.78 W/mK, but the composite of Example 2 in which 10 vol% of a heat dissipation material (h-BN) is added In the case of (without mesh), the heat dissipation property was improved by 110% compared to Example 1 at 1.64 W/mK, and in the case of the composite film composited with the copper mesh (with mesh), the heat dissipation property of Examples 1 and 2 was 2.39 W At /mK, 5.99 W/mK, it can be confirmed that it has electromagnetic wave shielding and absorbing power as well as heat dissipation properties.

On the other hand, the embodiments of the present invention disclosed in the present specification and drawings are merely presented as specific examples to aid understanding, and are not intended to limit the scope of the present invention. It will be apparent to those of ordinary skill in the art to which the present invention pertains that other modifications based on the technical spirit of the present invention can be implemented in addition to the embodiments disclosed herein.

Claims (23)

a polymer matrix layer in which magnetic fillers are dispersed; and
Heat radiation comprising a metal mesh impregnated in the polymer matrix layer - a composite film with electromagnetic wave shielding/absorbing ability.
The method of claim 1,
Heat dissipation, characterized in that the metal mesh is exposed on one side of the composite film - a composite film with electromagnetic wave shielding/absorbing ability.
The method of claim 1,
With respect to the polymer matrix layer, heat dissipation, characterized in that the heat dissipation filler is additionally dispersed - a composite film with electromagnetic wave shielding/absorbing ability.
The method of claim 1,
The material of the metal mesh is copper (Cu), silver (Ag), aluminum (Al), nickel (Ni), gold (Au) or iron (Fe), characterized in that the heat dissipation-electromagnetic wave shielding / absorbing composite film.
The method of claim 1,
The metal mesh is made of copper (Cu).
The method of claim 1,
The magnetic filler is one or two or more selected from the group consisting of Fe, Fe-based alloys, M-type hexaferrite and M-type hexaferrite-substituted magnetic materials - a composite film with electromagnetic wave shielding/absorbing ability.
The method of claim 1,
The magnetic filler is a spherical Fe or SrFe ₁₂ O ₁₉ , characterized in that the heat dissipation-electromagnetic wave shielding / absorbing ability provided composite film.
4. The method of claim 3,
The heat dissipation filler is graphite, graphene, carbon nanotube, carbon black, nano diamond, hexagonal boron nitride (h-BN), cubic boron nitride (c-BN), boron nitride nanotube, aluminum nitride (AlN) and Alumina (Al ₂ O ₃ ) Heat radiation, characterized in that one or two or more selected from the group consisting of - a composite film with electromagnetic wave shielding/absorbing ability.
4. The method of claim 3,
The heat dissipation filler is heat dissipation, characterized in that the hexagonal boron nitride (h-BN) - a composite film equipped with electromagnetic wave shielding/absorbing ability.
The method of claim 1,
The polymer is high-density polyethylene (HDPE), linear low-density polyethylene, low-density polyethylene, polyvinyl alcohol (polyvinyl alcohol), polyvinyl difluoride (PVDF), polyethylene terephthalate (PET), poly Butylene terephthalate (Poly butylene terephthalate; PBT), polydimethyl siloxane (poly dimethyl siloxane), polysilazane (Poly silazane) and polysiloxane (Poly siloxane) heat dissipation, characterized in that 1 or 2 or more selected from the group consisting of - Composite film with electromagnetic wave shielding/absorbing ability.
The method of claim 1,
The polymer is heat dissipation, characterized in that high-density polyethylene (HDPE) - a composite film provided with electromagnetic wave shielding / absorption.
The method of claim 1,
Heat radiation, characterized in that the thickness of the composite film is 1 μm to 10 mm - Composite film with electromagnetic wave shielding/absorbing ability.
4. The method of claim 3,
The magnetic filler and the heat dissipation filler have a diameter smaller than the thickness of the composite film.
Dispersing a magnetic filler on a polymer matrix to prepare a mixed composite;
filming the composite; and
impregnating a metal mesh onto the filmed composite
A method of manufacturing a composite film having heat dissipation-electromagnetic wave shielding/absorbing ability.
15. The method of claim 14,
Heat dissipation, characterized in that the heat dissipation filler is additionally dispersed with respect to the polymer matrix - a method of manufacturing a composite film with electromagnetic wave shielding/absorbing ability.
15. The method of claim 14,
The material of the metal mesh is copper (Cu), silver (Ag), aluminum (Al), nickel (Ni), gold (Au) or iron (Fe), characterized in that the heat dissipation-electromagnetic wave shielding / absorbing composite A method for producing a film.
15. The method of claim 14,
Heat dissipation, characterized in that the material of the metal mesh is copper (Cu) - Method of manufacturing a composite film with electromagnetic wave shielding/absorbing ability.
15. The method of claim 14,
The magnetic filler is one or two or more selected from the group consisting of Fe, Fe-based alloy, M-type hexaferrite, and M-type hexaferrite substituted magnetic material - Manufacturing of a composite film with electromagnetic wave shielding/absorbing ability Way.
15. The method of claim 14,
The magnetic filler is a spherical Fe or SrFe ₁₂ O ₁₉ Heat dissipation, characterized in that the electromagnetic wave shielding / manufacturing method of a composite film provided with absorption.
15. The method of claim 14,
The heat dissipation filler is graphite, graphene, carbon nanotube, carbon black, nano diamond, hexagonal boron nitride (h-BN), cubic boron nitride (c-BN), boron nitride nanotube, aluminum nitride (AlN) and 1 or 2 or more selected from the group consisting of alumina (Al ₂ O _{3 ).}
15. The method of claim 14,
The heat dissipation filler is heat dissipation, characterized in that the hexagonal boron nitride (h-BN) - manufacturing method of a composite film provided with electromagnetic wave shielding/absorbing ability.
15. The method of claim 14,
The polymer is high-density polyethylene (HDPE), linear low-density polyethylene, low-density polyethylene, polyvinyl alcohol (polyvinyl alcohol), polyvinyl difluoride (PVDF), polyethylene terephthalate (PET), poly Butylene terephthalate (Poly butylene terephthalate; PBT), polydimethyl siloxane (poly dimethyl siloxane), polysilazane (Poly silazane) and polysiloxane (Poly siloxane) heat dissipation, characterized in that 1 or 2 or more selected from the group consisting of - A method of manufacturing a composite film having electromagnetic wave shielding/absorbing ability.
15. The method of claim 14,
The polymer is heat dissipation, characterized in that the high-density polyethylene (HDPE) - manufacturing method of a composite film equipped with electromagnetic wave shielding / absorption capability.

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