KR20170043155A - Polymer composite with electromagnetic absorbing ability and high thermal conductivity and manufacturing method of the same - Google Patents
Polymer composite with electromagnetic absorbing ability and high thermal conductivity and manufacturing method of the same Download PDFInfo
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- KR20170043155A KR20170043155A KR1020150142483A KR20150142483A KR20170043155A KR 20170043155 A KR20170043155 A KR 20170043155A KR 1020150142483 A KR1020150142483 A KR 1020150142483A KR 20150142483 A KR20150142483 A KR 20150142483A KR 20170043155 A KR20170043155 A KR 20170043155A
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- WPVCFEULGFXPJD-UHFFFAOYSA-N CC(C)(c(cc1)ccc1O)c(cc1)ccc1OC Chemical compound CC(C)(c(cc1)ccc1O)c(cc1)ccc1OC WPVCFEULGFXPJD-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/009—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive fibres, e.g. metal fibres, carbon fibres, metallised textile fibres, electro-conductive mesh, woven, non-woven mat, fleece, cross-linked
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/153—Amorphous metallic alloys, e.g. glassy metals
- H01F1/15316—Amorphous metallic alloys, e.g. glassy metals based on Co
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
- H05K7/20436—Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing
- H05K7/20445—Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing the coupling element being an additional piece, e.g. thermal standoff
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Abstract
Description
The present invention relates to a polymer composite having electromagnetic wave absorptivity and thermal conductivity and a method for producing the same, and more particularly, to an electromagnetic wave absorptive fiber sheet for absorbing electromagnetic waves and a thermally conductive film for emitting heat generated when electromagnetic waves are absorbed Wherein the electromagnetic wave absorbing fiber sheet contains glass fibers coated with a magnetic material and contains expanded graphite in a thermoplastic resin constituting the matrix of the thermally conductive film and has excellent electromagnetic wave absorbing property and heat radiation performance at the same time, And a manufacturing method thereof.
As the demand for miniaturization, integration, and weight reduction of electric / electronic parts such as computers and mobile phones is increasing, the characteristics of polymer materials are continuously required to change.
However, when a polymer material is used as a case or a housing of an electronic part because it is an electric insulator and passes an electromagnetic wave, it may cause a large problem such as a component malfunction due to electromagnetic wave interference, reliability, and shortening the life span of the electronic part.
In order to prevent electromagnetic interference generated by electronic components, electromagnetic wave shielding introduces electromagnetic wave from the surface of the material to shield electromagnetic waves. The reflected electromagnetic wave again influences other parts inside the electronic component Secondary damage can occur. Therefore, it is necessary to develop an electromagnetic wave absorbing material which absorbs the electromagnetic wave itself.
Most commonly used materials are those that have high electromagnetic wave absorption or high thermal conductivity. The electromagnetic wave vibrates the electrons to make the flow of the electrons, which is emitted as heat energy to enable the absorption of electromagnetic waves. It is necessary to increase the electromagnetic wave absorption performance by easily removing the heat due to the absorption of the electromagnetic waves. The lifetime of the electronic component can be extended.
Therefore, it is important to include a substance that absorbs electromagnetic waves on the case and the surface of the housing of the electronic component, and to release the heat generated by the electromagnetic wave absorption to the outside. For this purpose, it is necessary to design the electromagnetic wave absorbing material and the thermally conductive material to be applied simultaneously.
A problem to be solved by the present invention is to provide an electromagnetic wave absorptive fiber sheet for absorbing electromagnetic waves and a thermally conductive film for releasing heat generated when electromagnetic waves are absorbed, Wherein the expanded graphite is contained in a thermoplastic resin constituting the matrix of the thermally conductive film and has excellent electromagnetic wave absorbability and heat radiation performance at the same time, and a process for producing the same.
The present invention relates to an electromagnetic wave absorber comprising a first thermally conductive film for emitting heat generated when electromagnetic waves are absorbed, an electromagnetic wave absorbing fiber sheet provided on the first thermally conductive film, and a heat- Wherein the electromagnetic wave absorptive fiber sheet comprises glass fibers coated with a FeCo-based magnetic material, and the first and second thermally conductive films are made of a thermoplastic resin in which expanded graphite is discontinuous And a polymer dispersed uniformly dispersed in the polymer matrix.
It is preferable that the FeCo-based magnetic material is coated on the glass fiber with a thickness of 1.0 to 2.5 m.
The glass fibers may include plate-shaped glass fibers having an aspect ratio of 2 to 10 in cross section.
It is preferable that the expanded graphite is contained in the first and second thermally conductive films in an amount of 5.0 to 13.0 parts by weight based on 100 parts by weight of the thermoplastic resin.
The expanded graphite may have a size of 10 to 200 nm and be dispersed in the thermoplastic resin.
Wherein the thermoplastic resin is a polycarbonate resin, 1 to 7 parts by weight of a polycyclohexanedimethylene terephthalate glycol (PCTG) resin and 100 parts by weight of the polycarbonate resin with respect to 100 parts by weight of the polycarbonate resin, It is preferably a polycarbonate resin containing 5 to 13 parts by weight of a polyethylene terephthalate glycol (PETG) resin.
It is preferable that the first and second thermally conductive films have a thickness of 0.1 to 0.2 mm.
The polymer composite preferably has a thickness of 0.4 to 0.6 mm by compression-molding the first thermally conductive film, the electromagnetic wave-absorbing fiber sheet and the second thermally conductive film sequentially laminated.
The electromagnetic wave absorbing fiber sheet comprises a first arrangement layer in which glass fibers coated with FeCo-based magnetic material are arranged in a first direction, and a second arrangement layer in which glass fibers coated with FeCo-based magnetic material are oriented in a second direction perpendicular to the first direction The first alignment layer and the second alignment layer may be sequentially stacked such that the first direction and the second direction are perpendicular to each other.
According to the present invention, there is also provided a method of manufacturing a magnetic recording medium, comprising the steps of: forming first and second thermally conductive films in which expanded graphite is discontinuously and uniformly dispersed in a thermoplastic resin; And a step of sequentially laminating the first thermally conductive film for radiating heat generated when the electromagnetic wave is absorbed, the electromagnetic wave absorbing fiber sheet for electromagnetic wave absorption and the second thermally conductive film, and compression molding The present invention also provides a method for producing a polymer composite.
Wherein the first and second thermally conductive films are formed by the steps of: injecting a starting material containing the thermoplastic resin and expanded graphite into an extruder to form a thermally conductive composite composition; and thermally transferring the thermally conductive composite composition to a glass Forming a plate-shaped thermally conductive film by compression molding while heating to a temperature of 200 to 320 캜 higher than the total ion.
The expanded graphite is preferably contained in the first and second thermally conductive films in an amount of 5.0 to 13.0 parts by weight based on 100 parts by weight of the thermoplastic resin.
It is preferable that the first and second thermally conductive films are compression-molded so as to have a thickness of 0.1 to 0.2 mm.
The thermoplastic resin preferably comprises a polycarbonate resin, 1 to 7 parts by weight of PCTG resin per 100 parts by weight of the polycarbonate resin, and 5 to 13 parts by weight of PETG resin per 100 parts by weight of the polycarbonate resin.
The polymer composite is preferably compression-molded to have a thickness of 0.4 to 0.6 mm.
Wherein the electromagnetic wave absorbing fiber sheet comprises a step of catalytically treating the surface of the glass fiber with at least one substance selected from tin chloride and palladium and a step of electroless-plating and coating the surface of the catalyzed glass fiber with a FeCo- The first arrangement layer is formed by arranging the glass fibers coated with the FeCo magnetic material in the first direction and the glass fibers coated with the FeCo magnetic material are arranged in the second direction perpendicular to the first direction, And forming the electromagnetic wave absorbing fiber sheet by sequentially laminating the first alignment layer and the second alignment layer so that the first direction and the second direction are perpendicular to each other.
The FeCo-based magnetic material is preferably coated on the glass fiber to a thickness of 1.0 to 2.5 mu m.
It is preferable that the glass fibers have a cross-sectional aspect ratio of 2 to 10.
According to the present invention, there is provided an electromagnetic wave absorptive fiber sheet for absorbing electromagnetic waves and a thermally conductive film for releasing heat generated when electromagnetic waves are absorbed, wherein the electromagnetic wave absorptive fiber sheet contains glass fibers coated with FeCo magnetic material And the expanded graphite is contained in the thermoplastic resin constituting the matrix of the thermally conductive film and has excellent electromagnetic wave absorptivity and heat radiation performance at the same time. The laminated structure of the electromagnetic wave fiber sheet including the FeCo-based magnetic material excellent in the electromagnetic wave absorbing ability and the expanded graphite including the expanded graphite excellent in thermal conductivity absorbs the electromagnetic wave generated from the electronic component, It can be removed by the thermally conductive film without accumulating and the continuous absorption ability of the electromagnetic wave can be maintained to improve the electromagnetic wave absorption ability.
The polymer composite of the present invention having excellent electromagnetic wave absorptivity and thermal conductivity can be applied to various fields such as a computer, an electronic part of a mobile phone, and a display device, which are required to have an electromagnetic wave absorbing property and a heat conductive property.
1 is a cross-sectional view of a polymer composite having electromagnetic wave absorbing property and thermal conductivity according to a preferred embodiment of the present invention.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, it should be understood that the following embodiments are provided so that those skilled in the art will be able to fully understand the present invention, and that various modifications may be made without departing from the scope of the present invention. It is not. Wherein like reference numerals refer to like elements throughout.
The present invention relates to an electromagnetic wave absorptive fiber sheet for electromagnetic wave absorption comprising glass fibers coated with a magnetic material, and a thermally conductive sheet for discharging heat generated when electromagnetic waves are absorbed, Film, and the thermally conductive film is provided with a polymer composite in which expanded graphite is compounded with an environmentally friendly thermoplastic resin and discontinuously and uniformly dispersed.
The polymer composite having electromagnetic wave absorptivity and thermal conductivity according to a preferred embodiment of the present invention includes a first thermally conductive film for emitting heat generated when electromagnetic waves are absorbed and an electromagnetic wave absorbing fiber sheet provided on the first thermally conductive film And a second thermally conductive film provided on the sheet of the electromagnetic wave absorbing fiber sheet to emit heat generated when the electromagnetic wave is absorbed, wherein the electromagnetic wave absorbing fiber sheet comprises glass fiber coated with a FeCo magnetic material, And the second thermally conductive film are made of a film in which expanded graphite is discontinuously and uniformly dispersed in a thermoplastic resin.
It is preferable that the FeCo-based magnetic material is coated on the glass fiber with a thickness of 1.0 to 2.5 m.
The glass fibers may include plate-shaped glass fibers having an aspect ratio of 2 to 10 in cross section.
It is preferable that the expanded graphite is contained in the first and second thermally conductive films in an amount of 5.0 to 13.0 parts by weight based on 100 parts by weight of the thermoplastic resin.
The expanded graphite may have a size of 10 to 200 nm and be dispersed in the thermoplastic resin.
Wherein the thermoplastic resin is a polycarbonate resin, 1 to 7 parts by weight of a polycyclohexanedimethylene terephthalate glycol (PCTG) resin and 100 parts by weight of the polycarbonate resin with respect to 100 parts by weight of the polycarbonate resin, It is preferably a polycarbonate resin containing 5 to 13 parts by weight of a polyethylene terephthalate glycol (PETG) resin.
It is preferable that the first and second thermally conductive films have a thickness of 0.1 to 0.2 mm.
The polymer composite preferably has a thickness of 0.4 to 0.6 mm by compression-molding the first thermally conductive film, the electromagnetic wave-absorbing fiber sheet and the second thermally conductive film sequentially laminated.
The electromagnetic wave absorbing fiber sheet comprises a first arrangement layer in which glass fibers coated with FeCo-based magnetic material are arranged in a first direction, and a second arrangement layer in which glass fibers coated with FeCo-based magnetic material are oriented in a second direction perpendicular to the first direction The first alignment layer and the second alignment layer may be sequentially stacked such that the first direction and the second direction are perpendicular to each other.
A method of manufacturing a polymer composite having electromagnetic wave absorbing property and thermal conductivity according to a preferred embodiment of the present invention includes the steps of forming first and second thermally conductive films in which expanded graphite is discontinuously and uniformly dispersed in a thermoplastic resin, Forming a sheet of electromagnetic wave absorbing fiber including glass fiber coated with a FeCo magnetic material, forming the first thermally conductive film to emit heat generated upon absorption of the electromagnetic wave, the electromagnetic wave absorbing fiber sheet for electromagnetic wave absorption, Sequentially laminating the thermally conductive film and compressing the thermally conductive film.
Wherein the first and second thermally conductive films are formed by the steps of: injecting a starting material containing the thermoplastic resin and expanded graphite into an extruder to form a thermally conductive composite composition; and thermally transferring the thermally conductive composite composition to a glass Forming a plate-shaped thermally conductive film by compression molding while heating to a temperature of 200 to 320 캜 higher than the total ion.
The expanded graphite is preferably contained in the first and second thermally conductive films in an amount of 5.0 to 13.0 parts by weight based on 100 parts by weight of the thermoplastic resin.
It is preferable that the first and second thermally conductive films are compression-molded so as to have a thickness of 0.1 to 0.2 mm.
The thermoplastic resin preferably comprises a polycarbonate resin, 1 to 7 parts by weight of PCTG resin per 100 parts by weight of the polycarbonate resin, and 5 to 13 parts by weight of PETG resin per 100 parts by weight of the polycarbonate resin.
The polymer composite is preferably compression-molded to have a thickness of 0.4 to 0.6 mm.
Wherein the electromagnetic wave absorbing fiber sheet comprises a step of catalytically treating the surface of the glass fiber with at least one substance selected from tin chloride and palladium and a step of electroless-plating and coating the surface of the catalyzed glass fiber with a FeCo- The first arrangement layer is formed by arranging the glass fibers coated with the FeCo magnetic material in the first direction and the glass fibers coated with the FeCo magnetic material are arranged in the second direction perpendicular to the first direction, And forming the electromagnetic wave absorbing fiber sheet by sequentially laminating the first alignment layer and the second alignment layer so that the first direction and the second direction are perpendicular to each other.
The FeCo-based magnetic material is preferably coated on the glass fiber to a thickness of 1.0 to 2.5 mu m.
It is preferable that the glass fibers have a cross-sectional aspect ratio of 2 to 10.
Hereinafter, a polymer composite having excellent electromagnetic wave absorptivity and thermal conductivity according to a preferred embodiment of the present invention and a method for producing the same will be described in detail.
1, the
The electromagnetic wave absorptive fiber sheet (120) includes an FeCo magnetic material excellent in electromagnetic wave absorption performance, and the first and second thermally conductive films (110, 130) are configured to include expanded graphite excellent in thermal conductivity. 120 and the thermally
A method for producing an electromagnetic wave absorbing fiber sheet including glass fiber coated with a FeCo magnetic material will be described in more detail.
The surface of the glass fiber is catalytically treated with tin chloride, palladium, a mixture thereof, and the FeCo-based magnetic material is coated on the surface of the glass fiber by electroless plating.
Since it is difficult to electrolessly coat the FeCo-based magnetic material directly on the glass fiber, the glass fiber is catalyzed with tin chloride, palladium, or a mixture thereof.
The glass fiber is preferably a plate-like glass fiber that can be coated with an FeCo-based magnetic material. In the case of the fibrous or spherical filler, since the contact between the fillers is made of a point contact, the transfer efficiency of the lattice vibrator (phonon) can be drastically lowered, so that it is advantageous in the case of a plate-like shape.
In order to improve the reactivity of the FeCo-based magnetic material coating, the process may further include washing the impurities on the surface of the glass fiber treated with distilled water, a surfactant solution, an acidic aqueous solution, a basic aqueous solution or the like.
The FeCo-based magnetic material is coated on the surface of the glass fiber treated with the catalyst. So that the characteristics of the FeCo-based magnetic material can be expressed in the glass fiber treated with the catalyst.
In order to electrolessly coat the FeCo-based magnetic material, it is preferable to use an iron (Fe) -cobalt (Co) metal compound having excellent permeability in the form of liquid.
As a method of forming a FeCo-based magnetic material layer on the surface of the glass fiber, any method capable of coating a magnetic material can be used without limitation, but it is preferably carried out by an electroless plating method.
The magnetic material layer coated on the surface of the glass fiber is preferably an iron (Fe) -cobalt (Co) alloy or the like. For example, the electromagnetic-wave-absorbing fiber sheet may be provided in the form of a plate-shaped glass fiber coated with FeCo, which is one of the metal compounds.
The thickness of the magnetic material layer is preferably 0.5 to 5 mu m, more specifically about 1.0 to 2.5 mu m. If the thickness of the magnetic material layer is less than 1.0 탆, it is advantageous in weight reduction. However, the volume fraction of the FeCo magnetic material may be lower than the volume of the glass fiber to lower the magnetic property and the strength may be weak, If it is more than 2.5 占 퐉, there is a problem that the lightening effect of the fiber is deteriorated.
In the case of electromagnetic wave absorption, it is preferable to fabricate a fiber sheet having a high density of electromagnetic wave absorbing fillers because the absorption rate of electromagnetic waves increases as a dense network is formed between the materials. Considering this, the glass fibers coated with the FeCo-based magnetic material are arranged in the first direction to form the first arrangement layer, and the glass fibers coated with the FeCo-based magnetic material are arranged in the second direction perpendicular to the first direction It is preferable to form the electromagnetic wave absorbing fiber sheet by sequentially laminating the first alignment layer and the second alignment layer so that the first direction and the second direction are perpendicular to each other after the second alignment layer is formed. The stacking of the first alignment layer and the second alignment layer may be repeatedly performed in plural.
The first and second thermally
The first and second thermally
The thermoplastic resin may be selected from among a polyolefin resin, a polyamide resin, a polybutylene terephthalate resin, an acrylonitrile butadiene styrene copolymer, a polycarbonate resin, a polyester resin, a polyphenylene sulfide resin and a thermoplastic elastomer resin And may be at least one thermoplastic resin selected. It is preferable to use an eco-friendly thermoplastic polymer resin as the thermoplastic resin constituting the matrix, more specifically, to use a polycarbonate resin. Specifically, a polycarbonate resin, 1 to 7 parts by weight of a recycled thermoplastic polymer resin per 100 parts by weight of the polycarbonate resin, a polycarbonate-based resin containing 5 to 13 parts by weight of a bio-based thermoplastic polymer resin per 100 parts by weight of the polycarbonate resin Resin can be used. The recycled thermoplastic polymer resin may be polycyclohexanedimethylene terephthalate glycol (PCTG), and the bio-based thermoplastic polymer resin may be polyethylene terephthalate glycol (PETG).
The following formula 1 shows the structure of a linear chain polycarbonate having an average molecular weight of about 12000 to 24000 and having an average molecular weight of about 10 minutes to about 10 minutes at 300 DEG C under a load of 1.2 kg according to ASTM D- And has a melt flow of about 10 to 50 g.
[Chemical Formula 1]
Polyethylene terephthalate glycol (PETG) resins provide excellent properties for sheet extrusion, injection molding, extrusion-blow molding, profile extrusion and the like.
The polyethylene terephthalate glycol (PETG) resin is an amorphous copolymer formed by the reaction of terephthalic acid (TPA) and ethylene glycol (EG), and the polyethylene terephthalate glycol (PETG) A part of ethylene glycol (EG) is replaced with cyclohexanedimethanol (CHDM). The following chemical formula 2 shows the structure of polyethylene terephthalate glycol (PETG).
(2)
The cyclohexanedimethanol (CHDM) (1,4 cyclohexanedimethanol) prevents crystallization and has excellent toughness, transparency and chemical resistance and improves workability. Cyclohexanedimethanol (CHDM) generally induces dimethyl terephthalate (DMT) by hydrogenation.
The polyethylene terephthalate glycol (PETG) resin has a high bulk density and excellent extruder feeding property as compared to a cylindrical granule of a spherical granule. Polyethylene terephthalate glycol (PETG) resin is superior to polycarbonate in chemical resistance, is easy to bend cold, is easy to print, is excellent in thermoforming, and has a processing window wide. Polyethylene terephthalate glycol (PETG) resins are easily blended with polycarbonate while maintaining good transparency. The polyethylene terephthalate glycol (PETG) resin has an intrinsic viscosity of about 0.75 dl / g, an excellent stretching strength of 150% or more and excellent flame retardancy.
The chemical formula 3 is a structural formula of polycyclohexanedimethylene terephthalate glycol (PCTG), wherein the chemical structure of polycyclohexanedimethylene terephthalate glycol (PCTG) is cyclohexanedimethanol substituted with a hydroxyl group (OH) Is similar to polyethylene terephthalate glycol (PETG), except that the content of CHDM is increased.
(3)
The expanded graphite, which is a thermally conductive material, is preferably contained in the first and second thermally
Expanded graphite may be one in which graphite is purified by sulfuric acid, hydrogen peroxide and NH 4 S 2 O 8 and then stripped at a temperature higher than 300 ° C., and the stripped graphite plates are connected to each other to form a powder- Graphite.
The expanded graphite is a particulate expanded graphite having a soft particulate form formed by compressing the powdery expanded graphite, and the graphite sheet peeled off by an extruder may have a crystal size of 10 to 200 nm.
The first and second thermally
The first and second thermally
In addition, the first and second thermally
In addition, the first and second thermally
In addition, the first and second thermally
The first and second thermally
Hereinafter, a method for producing a thermally conductive composite composition using a continuous twin screw extruder will be described in more detail. The twin-screw extruder is designed with a screw design to provide uniform melting and mixing of the compound and obtain good dispersibility. The twin-screw extruder is designed to act as a composite shear (high shear in the melt and compression zone and low shear in the dispersion zone).
In order to produce the thermally conductive composite composition, a starting material containing a thermoplastic resin and expanded graphite is put into a hopper of the twin-screw extruder, and is melt-extruded. Thereafter, the mixture is cooled and cut in a water bath, To form a composition. The thermoplastic resin may include a polycarbonate resin, a recycled thermoplastic polymer resin, and a bio-based thermoplastic polymer resin. For example, the thermoplastic resin includes a polycarbonate resin, 1 to 7 parts by weight of a recycled thermoplastic polymer resin per 100 parts by weight of the polycarbonate resin, and 5 to 13 parts by weight of a bio-based thermoplastic polymer resin relative to 100 parts by weight of the polycarbonate resin A polycarbonate resin may be used.
In order to improve the properties of the thermally conductive composite composition, the starting material may be added to the twin-screw extruder, and then the core-shell crosslinked rubber may be further added as an auxiliary raw material. In addition, a phosphate, a phosphonate, a phosphinate, And at least one substance selected from phosphazene may be further added. Antioxidants, lubricants, light stabilizers, etc. may also be added together.
The internal temperature of the twin-screw extruder is preferably about 190 to 300 캜. More specifically, in the melting and compression zone of the extruder, the temperature is maintained at 240 to 290 ° C (cylinder temperature), which is higher than the melting temperature of the starting material fed through the hopper. After the melting and compression of the raw material introduced through the hopper is completed The temperature of the cylinder of the extruder is set to 190 to 240 DEG C in accordance with the dispersed region of the extruder and the temperature of the cylinder is maintained at 240 to 300 DEG C higher than the temperature in the dispersion region in the discharge region of the extruder. The thermally conductive composite composition discharged from the twin screw extruder is quenched in a water bath to be cut to a desired size and dried to obtain a final thermally conductive composite composition. The temperature of the water tank is preferably maintained at a temperature of 40 DEG C or lower which is lower than the glass transition temperature of the starting material.
The thermally conductive composite composition thus produced is press-molded while heating at a temperature higher than the glass precursor of the thermoplastic resin (e.g., 200 to 320 DEG C) to form a thin plate-shaped thermally conductive film. The first and second thermally
Hereinafter, the experimental examples according to the present invention will be specifically shown, and the present invention is not limited by the following experimental examples.
Thermoconductive composite compositions were prepared using polycarbonate (PC) resins, polycyclohexanedimethylene terephthalate glycol (PCTG), polyethylene terephthalate glycol (PETG), expanded graphite, core-shell crosslinked rubbers, antioxidants, lubricants and light stabilizers. The thermoconductive composite composition was prepared using the twin screw extruder described above.
The polycarbonate resin used was one having a melt index of 15 g / 10 min (ASTM D 1238, 300 ° C, 1.2 kg). PCTG, a recycled thermoplastic polymer resin, was a product name of JN100 manufactured by SK Chemical Co., PETG used the product T120 from SK Chemicals.
The expanded graphite (C-therm, exapnded graphite granule of Timcal) had a crystal size of 35 nm and an apparent specific gravity of 0.15 g / cm 3 .
The first core-shell crosslinked rubber used was EM500 manufactured by LG Chemical Co., Ltd., having a particle size of 0.3 to 0.35 탆, and the second core-shell crosslinked rubber used was ethylene-butyl acrylate-glycidyl methacrylate polymer -butylacrylate-Glycidyl methacrylate terpolymer) having a melt index of 6.5 g / 10 min (ASTM D 1238, 190 DEG C, 2.16 kg) was used.
A phenolic antioxidant having a specific gravity of 1.04 g / cm 3 was used as the first antioxidant and a specific gravity of 1.04 g / cm 3 as the second antioxidant.
The lubricant used was Loxiol product as an ester-based lubricant.
The light stabilizer was a HASL-based client (Clariant) Hostabin product.
Table 1 below shows the composition components for preparing the thermally conductive composite composition.
The temperature of the melted and compressed region Z1 was set to 270 deg. C, the temperature of the dispersed region Z2 was set to 280 deg. C, the temperature of the discharge region Z3 was set to 280 deg. C and the die temperature was set to 290 deg. 220 rpm, and the output was set at 25 to 35 kg / hr to prepare a thermoconductive composite composition.
The thermally conductive composite composition thus obtained was compression molded at a temperature of 270 ° C, a preheating time of 4 minutes, a compression molding time of 3 minutes, and a compression molding pressure of 35 MPa to prepare a thermally conductive film having a thickness of 0.1 to 0.2 mm.
The flaky glass fibers were added to a mixed solution of tin chloride (SnCl 2 , 9.6 g) and hydrochloric acid (12 mL) and treated for 10 minutes. Then, cobalt sulfate heptahydrate (CoSO 4 · 7H 2 O, 20 g) 20 g of FeSO 4 .7H 2 O, Rochelle salt (C 4 H 4 KNaO 6 , 230 g), sodium hydroxide (NaOH, 40 g), potassium borohydride (KBH 4 , Catalyst-treated plate-shaped glass fibers were added to the plating solution in which distilled water (1800 mL) was mixed and electroless plating was conducted at 45 ° C for 1 hour and 30 minutes to obtain plate-shaped glass fibers coated with a magnetic material. The magnetic material used was FeCo (content ratio 5: 5) and FeCo (content ratio: 1: 6), and the glass fibers used were plate-shaped short fibers having an aspect ratio of 4.
Polymer composites with both electromagnetic wave absorbing ability and thermal conductivity were prepared by using plate - shaped glass fiber coated with FeCo - based magnetic material and thermally conductive film.
Wherein the first array layer is formed by arranging the plate-shaped glass fibers coated with the FeCo-based magnetic material in the first direction, and the plate-shaped glass fibers coated with the FeCo-based magnetic material are arranged in the second direction perpendicular to the first direction 2 array layers are formed on the first direction and the plate-shaped glass fibers coated with the FeCo-based magnetic material are arranged in a first direction perpendicular to the second direction to form a third arrangement layer, The first alignment layer, the second alignment layer, and the third alignment layer are sequentially laminated so that the directions are perpendicular to each other to form an electromagnetic wave absorbing fiber sheet.
The first thermally conductive film, the electromagnetic wave absorbing fiber sheet, and the second thermally conductive film were sequentially laminated and compression molded to produce a first polymer composite. The first thermally conductive film, the electromagnetic wave absorbing fiber sheet, and the second thermally conductive film were sequentially And a first polymer complex was prepared by compression molding. The sheet of the electromagnetic wave absorbing fiber contained in the first polymer composite and the second polymer composite was 30 wt% of the total content of each polymer composite. The first polymer composite and the second polymer composite were again compression-molded to a final thickness of about 0.5 mm.
The composition of the polymer complex is shown in Table 2 below.
The physical properties of the polymer composite thus prepared were measured by the following method.
The flexural modulus (FM) was measured according to ASTM D790 at a crosshead speed of 5 mm / min and the unit of flexural modulus was GPa.
IZOD Notched The impact strength was determined by dividing the energy when the specimen was broken according to ASTM D256 by the unit thickness and using a specimen having a thickness of 1/8 '. The unit of impact strength is KJ / m 2 .
Thermal Conductivity was measured in the in-plane direction by the Laser-Flash method. The unit of thermal conductivity is W / mK.
Electroabsorption capacity was measured using a 50 mm × 50 mm sample with a signal line width of 4.4 mm and a length of 50 mm. In case of near field, IEC standard micorstrip method is applied and plane field approximation is applied in the case of the original field.
Table 3 below shows the results of physical properties evaluation for polymer complexes.
As shown in Table 3, in the case of Experimental Example 4, it was found that the electromagnetic wave absorbing ability and thermal conductivity were 90% and 1.72 W / mK, respectively.
In the case of Experimental Example 5, it was confirmed that the flexural modulus was 7 GPa as compared with Experimental Example 4, but the impact strength was 6.1 KJ / m 2 , which was superior to Experimental Example 4. This indicates that ethylene-butylacrylate-Glycidyl methacrylate terpolymer (second core-shell crosslinked rubber) added as a reactive additive exhibited more excellent properties as an impact modifier. .
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, This is possible.
100: polymer complex
110: first thermally conductive film
120: Electromagnetic wave absorbing fiber sheet
130: second thermally conductive film
Claims (14)
An electromagnetic wave absorbing fiber sheet provided on the first thermally conductive film;
And a second thermally conductive film provided on the sheet for absorbing electromagnetic waves and for emitting heat generated when electromagnetic waves are absorbed,
Wherein said electromagnetic wave-absorbing fiber sheet comprises glass fiber coated with FeCo-based magnetic material,
Wherein the first and second thermally conductive films are made of a film in which expanded graphite is discontinuously and uniformly dispersed in a thermoplastic resin.
A first arrangement layer in which glass fibers coated with FeCo-based magnetic material are arranged in a first direction;
And a second alignment layer in which the FeCo-based magnetic material-coated glass fibers are arranged in a second direction perpendicular to the first direction,
Wherein the first alignment layer and the second alignment layer are sequentially stacked such that the first direction and the second direction are perpendicular to each other.
Forming an electromagnetic wave absorbing fiber sheet comprising glass fiber coated with a FeCo-based magnetic material; And
A step of sequentially laminating the first thermally conductive film for emitting heat generated when electromagnetic waves are absorbed, the electromagnetic wave absorbing fiber sheet for electromagnetic wave absorption and the second thermally conductive film, and compression molding ≪ / RTI >
Introducing a starting material containing the thermoplastic resin and expanded graphite into an extruder to form a thermally conductive composite composition; And
Forming a thermally conductive film of a plate-like shape by compression molding while heating the thermally conductive composite composition to a temperature of 200 to 320 캜 higher than the glass ion of the thermoplastic resin,
Wherein the expanded graphite has the first and second thermally conductive films in an amount of 5.0 to 13.0 parts by weight based on 100 parts by weight of the thermoplastic resin,
Wherein the first and second thermally conductive films are compression-molded to have a thickness of 0.1 to 0.2 mm.
Catalytically treating the glass fiber surface with at least one material selected from tin chloride and palladium;
A step of electroless-plating the FeCo-based magnetic material on the surface of the catalyst-treated glass fiber; And
The first arrangement layer is formed by arranging the glass fibers coated with the FeCo magnetic material in the first direction and the glass fibers coated with the FeCo magnetic material are arranged in the second direction perpendicular to the first direction, And forming the electromagnetic wave absorbing fiber sheet by sequentially laminating the first alignment layer and the second alignment layer so that the first direction and the second direction are perpendicular to each other,
The FeCo-based magnetic material is coated on the glass fiber to a thickness of 1.0 to 2.5 m,
Wherein the glass fiber has a cross-sectional aspect ratio of from 2 to 10.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022267289A1 (en) * | 2021-06-24 | 2022-12-29 | 南京玻璃纤维研究设计院有限公司 | Wave-absorbing composite material and preparation method therefor |
| KR102493723B1 (en) * | 2021-11-02 | 2023-01-31 | 퓨어만 주식회사 | Adhesive sheets for dissipating heat and shielding emi |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101992168B1 (en) * | 2017-12-18 | 2019-06-24 | 김영근 | Device for shielding of electromagnetic wave and the method of manufacturing thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101558748B1 (en) * | 2014-03-19 | 2015-10-08 | 윈엔윈(주) | Electromagnetic wave shielding sheet and method for producing the same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022267289A1 (en) * | 2021-06-24 | 2022-12-29 | 南京玻璃纤维研究设计院有限公司 | Wave-absorbing composite material and preparation method therefor |
| KR102493723B1 (en) * | 2021-11-02 | 2023-01-31 | 퓨어만 주식회사 | Adhesive sheets for dissipating heat and shielding emi |
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