WO2014189270A1 - 전기방사에 의해 제조된 탄소 복합 섬유를 포함하는 전자파 차폐 시트 및 이의 제조방법 - Google Patents
전기방사에 의해 제조된 탄소 복합 섬유를 포함하는 전자파 차폐 시트 및 이의 제조방법 Download PDFInfo
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- WO2014189270A1 WO2014189270A1 PCT/KR2014/004516 KR2014004516W WO2014189270A1 WO 2014189270 A1 WO2014189270 A1 WO 2014189270A1 KR 2014004516 W KR2014004516 W KR 2014004516W WO 2014189270 A1 WO2014189270 A1 WO 2014189270A1
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- resin
- composite fiber
- carbon
- shielding sheet
- metal
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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
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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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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0015—Electro-spinning characterised by the initial state of the material
- D01D5/003—Electro-spinning characterised by the initial state of the material the material being a polymer solution or dispersion
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
- D01F1/106—Radiation shielding agents, e.g. absorbing, reflecting agents
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/18—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from other substances
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F9/00—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
- D01F9/08—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments of inorganic material
- D01F9/12—Carbon filaments; Apparatus specially adapted for the manufacture thereof
- D01F9/14—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2101/00—Inorganic fibres
- D10B2101/10—Inorganic fibres based on non-oxides other than metals
- D10B2101/12—Carbon; Pitch
Definitions
- the present invention relates to an electromagnetic shielding sheet including a composite fiber produced by electrospinning so as to improve conductivity and electromagnetic shielding efficiency and a method of manufacturing the same.
- ADSL asymmetric digital subscriber lines
- ITS road traffic systems
- Electromagnetic shielding technology can be classified into two main methods: shielding around electromagnetic wave sources to protect external equipment and storing equipment inside shielding material to protect them from external electromagnetic radiation sources.
- the most popular method for this purpose is the electromagnetic shielding material.
- metal materials reflect electromagnetic waves, while insulating materials such as plastic pass electromagnetic waves. Shielding electromagnetic waves by metals is widely known. When electromagnetic waves come into contact with electrical conductors, some absorb or pass through, but most are reflected off the surface. This is because when the electromagnetic wave touches the conductor, eddy current is generated by the electromagnetic induction in the conductor, which reflects the electromagnetic wave.
- a metal material has an advantage that can effectively block the electromagnetic wave, it is produced by the die casting method has a disadvantage of high production cost and high defective rate.
- electromagnetic wave absorbing material examples include conductive electromagnetic wave absorbing materials, dielectric electromagnetic wave absorbing materials, and magnetic electromagnetic wave absorbing materials.
- Conductive materials are materials that absorb electromagnetic waves by current flowing through resistors, resistance wires, resistive coatings, etc., and in use, it is important to select a material having an appropriate resistance value, and an excellent electromagnetic wave absorber can be obtained even by a fabric made of conductive fibers. .
- Dielectric materials include carbon, carbon-containing foamed urethane, carbon-containing foamed polystyrene, and the like.
- this type of absorber it is necessary to have a multi-layered structure to reduce the attenuation near the surface and to increase the attenuation as it enters the inside.
- the Republic of Korea Patent Publication No. 2010-0112744 is a film in the form of a film consisting of carbon nanotubes and a binder exhibits the electromagnetic shielding performance by the carbon nanotubes, the total weight of the combined weight of the carbon nanotubes and the binder
- the carbon nanotubes are incorporated in an amount of 3 to 15% by weight based on the above;
- an electromagnetic shielding film characterized in that the thickness is 2mm to 5mm, and also proposes an electromagnetic shielding material in which the electromagnetic shielding film is attached to the panel by an adhesive.
- conductive plastics for shielding electromagnetic waves contain polymer-matrix composites containing electrically conductive fillers, such as metal fibers and carbon fibers, in a non-conductor general-purpose plastic matrix.
- electrically conductive fillers such as metal fibers and carbon fibers
- Republic of Korea Patent Publication No. 2007-0035832 is a step of dissolving at least one or more materials of a transparent material metal, ceramic or polymer in a solvent to produce a transparent base material in a solution state; Mixing at least one material of a predetermined amount of carbon nanotubes (CNT), carbon nanofibers (CNF), or nano-sized magnetic particles to allow electricity to flow through the base material, but maintain transparency; Dispersing the material mixed in the base material; It proposes a method of manufacturing a transparent electromagnetic shielding agent comprising the step of performing heat treatment on the dispersion-treated solution.
- CNT carbon nanotubes
- CNF carbon nanofibers
- Korean Patent Publication No. 2012-0023490 discloses (A) a thermoplastic resin; And (B) a carbon fiber having a length of 8 to 20 mm; wherein the carbon fiber (B) contains 45 to 65% by weight of the total composite material. It has excellent mechanical strength and EMI shielding and can replace the existing magnesium material to lower the production cost, and refers to the high rigidity electromagnetic shielding composite with excellent workability.
- Korean Patent Publication No. 2011-0113999 discloses an electromagnetic wave comprising 50 to 70 parts by weight of a metal powder, 0.2 to 4 parts by weight of carbon nanotubes, 20 to 40 parts by weight of a binder resin, and 0.5 to 20 parts by weight of a solvent, based on 100 parts by weight of the total composition.
- Sheet composition for shielding It is disclosed that the electromagnetic shielding and absorption efficiency per unit volume is excellent in a wide band including a high frequency region, and the manufacturing process is simple and economically advantageous.
- the above-mentioned patent proposes a simple mixture of a carbon material such as carbon nanotubes and a metal as an electromagnetic shielding material.
- a carbon material such as carbon nanotubes
- a metal as an electromagnetic shielding material.
- the carbon nanotubes composed of the core of the metal nanoparticles inside the carbon fiber shell through the electrospinning process The composite fiber was prepared, and when the carbon composite fiber was applied as the electromagnetic shielding sheet, the electromagnetic shielding effect was improved, thereby completing the present invention.
- Step 1 preparing a first spinning solution containing the metal nanoparticles, and a second spinning solution containing a carbon precursor
- Step 2 preparing a composite fiber having a web form by injecting the first spinning solution and the second spinning solution into an electrospinning apparatus equipped with a double nozzle and performing an electrospinning process, wherein the first spinning solution Silver is injected into the inner nozzle, and the second spinning solution is injected into the outer nozzle;
- Step 3 carbonizing the composite fiber to produce a carbon composite fiber, wherein the carbon composite fiber is composed of an outer shell made of carbon fibers and a core made of metal nanoparticles disposed in the longitudinal direction of the carbon fibers therein. Has a core-shell structure; And
- Step 4 It provides a method for producing an electromagnetic shielding sheet comprising the step of mixing the carbon composite fiber with a resin sheet processing.
- the sheet processing is characterized by using a carbon composite fiber in the form of a web, or using a chopped carbon composite fiber.
- the sheet processing is performed by a process of impregnating the carbon composite fiber in the resin, or injection molding by mixing with the resin, or by extrusion molding by mixing with the resin.
- the first spinning solution further includes a metal precursor, a capping agent, and a solvent for metal fiber production.
- the present invention provides an outer shell comprising carbon fibers; And it provides an electromagnetic shielding sheet comprising a carbon composite fiber and a resin having a core-shell structure consisting of a core composed of metal nanoparticles disposed in the longitudinal direction of the fiber therein.
- the carbon composite fiber is characterized in that the web form or chopped (chopped).
- the core further comprises metal nanofibers.
- the electromagnetic wave shielding sheet according to the present invention can prevent oxidation of the metal and secure conductivity in the longitudinal direction of the carbon fiber by disposing the metal nanoparticles inside the carbon fiber as the electromagnetic shielding material.
- the carbon composite fiber or carbon composite fiber web including the metal nanoparticles and carbon fibers has high electromagnetic wave shielding efficiency and thus may be used as an electromagnetic wave shielding material in various industrial fields.
- FIG. 1 is a schematic view showing a carbon composite fiber of the core-shell structure according to the present invention
- FIG. 2 is a cross-sectional view showing an electromagnetic shielding sheet according to a first embodiment of the present invention
- FIG. 3 is a cross-sectional view showing an electromagnetic shielding sheet according to a second embodiment of the present invention
- FIG. 1 is a schematic view showing a carbon composite fiber of a core-shell structure according to the present invention, wherein the carbon composite fiber 10 is composed of an outer shell 11 and a core 13.
- the outer shell 11 is made of carbon fiber
- the core 13 is composed of metal nanoparticles disposed in the longitudinal direction of the carbon fiber.
- Carbon composite fiber 10 having such a core-shell structure is the metal nanoparticles of the core 13 is disposed inside the shell 13 made of carbon fibers in the longitudinal direction and is blocked from the outside so that no oxidation occurs or less occurs, By having conductivity in the longitudinal direction, the electromagnetic shielding effect is improved.
- the carbon composite fiber of the core-shell structure referred to throughout the specification of the present invention is composed of an outer shell made of carbon fibers and a core made of metal nanoparticles disposed in the longitudinal direction of the carbon fibers inside the outer shell. It means a composite fiber.
- the carbon composite fiber web referred to throughout the specification of the present invention means that the 'carbon composite fiber having a core-shell structure' is manufactured in a web form.
- chopped carbon composite fibers means that the carbon composite fiber web is pulverized.
- the carbon composite fiber may be applied to an electromagnetic shielding sheet, and may be applied as it is in the form of a web by an electrospinning process, or may be variously applied in a fiber form by pulverizing it.
- the core may further include a metal nanofiber to further enhance the electromagnetic shielding effect.
- the electromagnetic shielding sheet including the carbon composite fiber of the core-shell structure proposed in the present invention is not limited to
- Step 1 preparing a first spinning solution containing the metal nanoparticles, and a second spinning solution containing a carbon precursor
- Step 2 preparing a composite fiber having a web form by injecting the first spinning solution and the second spinning solution into an electrospinning apparatus equipped with a double nozzle and performing an electrospinning process, wherein the first spinning solution Silver is injected into the inner nozzle, and the second spinning solution is injected into the outer nozzle;
- Step 3 carbonizing the composite fiber to produce a carbon composite fiber, wherein the carbon composite fiber is composed of an outer shell made of carbon fibers and a core made of metal nanoparticles disposed in the longitudinal direction of the carbon fibers therein. Has a core-shell structure; And
- Step 4 The carbon composite fiber is mixed with a resin and manufactured through a step of sheet processing.
- a first spinning solution containing metal nanoparticles and a second spinning solution including a carbon precursor are prepared.
- the first spinning solution is a solution for forming a core in the carbon composite fiber of the core-shell structure, and includes metal nanoparticles and a dispersion solvent for dispersing it.
- the metal nanoparticles are not particularly limited in the present invention, and any metal nanoparticle may be used as long as it is known to have an electromagnetic shielding effect. Typically, one selected from the group consisting of Al, Fe, Cr, Ni, Cu, Ag, Au, Pt, Pd, Sn, Co, stainless, and combinations thereof is used.
- the metal nanoparticles may be used alone or in the form of an alloy mixed with two or more kinds of metals, preferably in the form of alloys. In particular, it is possible to manufacture Mu-metal by alloying several kinds of metals such as Cu, Fe, and Ni at a high temperature of 1000 ° C. or higher, which is a carbon fiber carbonization process. do.
- Such metal nanoparticles have an average particle diameter of 10 to 100 nm, preferably 10 to 50 nm. As the size of the metal nanoparticles is increased, the conductivity is increased to increase the electromagnetic shielding effect.
- the dispersion solvent is not particularly limited in the present invention, and any solvent can be used as long as it can uniformly disperse the metal nanoparticles.
- any solvent can be used as long as it can uniformly disperse the metal nanoparticles.
- the second spinning solution is a solution for forming an outer shell of the carbon composite fiber having a core-shell structure, and includes a carbon precursor and a solvent.
- the carbon precursor may be used as long as it is a material capable of forming carbon fibers after carbonization.
- the carbon precursor may be polyacrylonitrile (PAN), polyperfuryl alcohol, cellulose, sucrose, glucose, polyvinylchloride, polyacrylic acid, polylactic acid, polyethylene oxide, polypyrrole, polyimide, polyimide, polyamide.
- PAN polyacrylonitrile
- polyperfuryl alcohol cellulose
- sucrose glucose
- polyvinylchloride polyacrylic acid
- polylactic acid polyethylene oxide
- polypyrrole polyimide
- polyimide polyimide
- polyamide polyamide
- the solvent is not particularly limited in the present invention, and for example, N, N-dimethylformamide (DMF), dimethylacetamide (DMAc), tetrahydrofuran (THF), dimethyl sulfoxide (DMSO), gamma butyrolactone, One selected from the group consisting of N-methylpyrrolidone, chloroform, toluene, acetone and combinations thereof can be used.
- DMF dimethylacetamide
- THF tetrahydrofuran
- DMSO dimethyl sulfoxide
- gamma butyrolactone One selected from the group consisting of N-methylpyrrolidone, chloroform, toluene, acetone and combinations thereof can be used.
- the metal nanoparticles and the carbon precursor in the first and second spinning solutions become core-shells constituting the carbon composite fiber through a subsequent process, in order to secure an appropriate electromagnetic shielding effect, they are 1: 1 to 1 in solid content. It has a weight ratio of 1: 100. If the amount of the metal nanoparticles is less than the above range, the electromagnetic shielding effect by the metal nanoparticles cannot be expected. On the contrary, if the content of the above metal nanoparticles exceeds the above range, dispersion and stability of the spinning solution are lowered. Therefore, it uses suitably within the said range.
- the first spinning solution further includes a metal precursor, a capping agent, and a solvent for including the metal fiber in the core.
- the metal of the metal precursor may be the same as or different from the metal nanoparticles.
- One species selected from is possible.
- the metal precursor may be a nitride oxide, nitride, halide, alkoxide, cyanine, sulfide, amide, cyanide, hydride, peroxide, porphine, hydrate, hydroxide, or ester of the metal.
- silver nitrate (AgNO 3 ), silver nitrite (AgNO 2 ), silver acetate (CH 3 COOAg), silver lactic acid (CH 3 CH (OH) COOAg), silver citrate hydrate (AgO 2) CCH 2 C (OH) (CO 2 Ag) CH 2 CO 2 Ag.xH 2 O)
- silver nitrate was used as a precursor to prepare Ag nanofibers.
- the capping agent is selectively adsorbed to any particular wavefront of the crystals and serves to inhibit crystal growth on the surface, thereby enabling the production of high aspect ratio Ag nanofibers, preventing aggregation between the fibers and preventing surface oxidation. To use.
- the capping agent may use a compound having an amine group or a carboxyl group.
- a polymer capping agent is used as a material for imparting a viscosity to a spinning solution during electrospinning and forming a fibrous phase during spinning.
- such a polymer capping agent may simultaneously play a role of a thickener as well as a reducing agent of silver cations by forming complexes in the manufacturing process of Ag nanofibers, and thus, there is no need to use a separate reducing agent and a thickener except when necessary. .
- the polymer capping agent is polyvinylpyrrolidone (PVP), polyethylene oxide (PEO), polyvinyl alcohol (PVA), polyvinylidene fluoride (PVDF), polyvinylacetate (PVAc) polyacrylonitrile (PAN) ), Polyamide (PA), polyacrylamide (PAA), polyurethane (PU), poly (etherimide) (PEI), polybenzimidazole (PBI), and a combination thereof. do.
- PVP polyvinylpyrrolidone
- PEO polyethylene oxide
- PVA polyvinyl alcohol
- PVDF polyvinylidene fluoride
- PVAc polyvinylacetate
- PA polyacrylonitrile
- PA Polyamide
- PAA polyacrylamide
- PU polyurethane
- PEI poly (etherimide)
- PBI polybenzimidazole
- the polymer capping agent uses a weight average molecular weight of 500,000 to 1,000,000.
- the Ag precursor and the capping agent are used in a weight ratio of 1: 0.1 to 1:10 so that the electrospinning is smoothly performed and the nanofibers are well formed after the heat treatment. If the Ag precursor content is excessively excessive or excessively used, Ag nanofibers may not be well formed after heat treatment.
- the solvent is not particularly limited as long as it can dissolve the Ag precursor and the capping agent, and a solvent that is the same as or compatible with the solvent for dispersing the metal nanoparticles is used. At this time, the specific solvent follows that mentioned in the dispersion solvent.
- the first spinning solution prepared in step (1) and the second spinning solution are injected into an electrospinning apparatus equipped with a double nozzle, followed by an electrospinning process to produce a core-shell composite fiber. .
- the first spinning solution is injected into the inner nozzle, and the second spinning solution is injected into the outer nozzle to perform an electrospinning process, and the composite fiber produced therefrom is manufactured in the form of a web.
- the 'composite fiber' has a core-shell structure, wherein the outer shell is made of a carbon precursor, and the inside is made of a core including metal nanoparticles.
- the core of the 'composite fiber' further comprises a silver precursor and a capping agent for the production of Ag nanofibers.
- the electrospinning process is not particularly limited in the present invention, and may be performed using a known electrospinning apparatus.
- the electrospinning apparatus consists of a power supply for applying a voltage, a spinneret, and a collector for collecting fibers.
- the spinning solution is discharged at a constant speed and discharged through the nozzle acting as a spinneret.
- one electrode connects the voltage regulator and the nozzle tip to inject electric charge into the spinning solution discharged, and reverses it.
- the electrode is connected to the collecting plate.
- the shape of the final hybrid nanofiber matrix obtained is possible to control the shape of the final hybrid nanofiber matrix obtained according to various parameters such as the voltage applied between the spinneret and the collector, the distance between them, the spinning solution flow rate, the nozzle diameter, the spinneret and the collector arrangement.
- the voltage between the spinneret and the collector is used in the range of 5-50 kV, preferably 10-40 kV, more preferably 15-20 kV.
- the voltage directly affects the diameter of the composite fiber. In other words, when the voltage is increased, the diameter of the composite fiber is small, but the surface of the fiber is very rough. On the contrary, when the voltage is too low, it is difficult to manufacture the composite fiber having a diameter of nm to ⁇ . do.
- a core-shell structured composite fiber having a diameter in the range of nm to ⁇ , preferably 10 to 1000 nm, is prepared using 0.01 to 1 mm and 0.05 to 3 mm externally.
- Step 3 carbon composite fiber manufacturing step of the core-shell structure
- the composite fiber prepared in step (2) is carbonized to produce a carbon composite fiber.
- the composite fiber of (step 2) is produced in the form of a web, carbon composite fiber produced by carbonizing it also has a web form.
- Carbonization is carried out in a process for producing ordinary carbon fibers, and is not particularly limited in the present invention.
- the carbonization process is performed by heat treatment at 500 ° C. to about 3000 ° C. for 20 minutes to 5 hours.
- the carbonization removes all organic matter (also solvents, capping agents, resins, additives, etc.) present in the composite fiber, and carbon atoms are rearranged or coalesced to produce a carbon structure having excellent conductivity, that is, carbon fiber.
- the obtained carbon fiber has a diameter of 1 nm to 100 ⁇ m, preferably 100 nm to 10 ⁇ m, and if the temperature or time is less than the above range, it is difficult to form the carbon fiber.
- the carbon composite fiber obtained by carbonization has a core-shell structure in which an outer shell is made of carbon fibers and a core made of metal nanoparticles disposed therein in the longitudinal direction of the carbon fibers.
- the metal nanofiber is produced by this carbonization process.
- the prepared metal nanofibers have a diameter of 10 to 1000 nm.
- the carbon composite fiber prepared in the above (Step 3) is sheet-processed together with the resin to prepare an electromagnetic shielding sheet.
- the carbon composite fiber produced through step (3) has a web form, wherein the carbon composite fiber having the web form is applied to the electromagnetic shielding sheet as it is, or crushed to form an chopped carbon composite fiber. Apply to sheet.
- the sheet processing is not particularly limited in the present invention, and any method may be used as long as it is a method for producing a sheet known in the art.
- the carbon composite fiber is carried out by a process of impregnating a resin, injection molding by mixing with a resin, or extrusion molding by mixing with a resin.
- the impregnation process may use a method of forming a mold using a mold, filling a resin into the mold, and then inserting a composite fibrous web and then impregnating the thermoplastic resin.
- a casting method may be used.
- Resin can be used as long as it is used as a matrix of an electromagnetic wave shielding sheet, It does not specifically limit in this invention.
- the resin solution is dimethylformamide (DMF), toluene, tetrahydrofuran (THF), dimethyl sulfoxide, dimethylacetamide, N-methylpyrrolidone (NMP), chloroform, methylene chloride, carbon tetrachloride, trichloro as solvent.
- 1 type selected from the group consisting of robenzene, benzene, cresol, xylene, acetone, methyl ethyl ketone, acrylonitrile, cyclohexane, cyclohexanone, ethyl ether, hexane, isopropyl alcohol, methanol, ethanol and combinations thereof Use
- the electromagnetic shielding sheet 50 produced by the first embodiment is a carbon composite fiber 51 having a web form of the resin 53 Has a structure impregnated in
- FIG. 3 is a cross-sectional view showing an electromagnetic shielding sheet according to a second embodiment of the present invention, wherein the electromagnetic shielding sheet 60 manufactured by the second embodiment includes a resin matrix 63; And a structure in which chopped carbon composite fibers 61 are dispersed in the matrix 63.
- Electromagnetic shielding sheet proposed in the present invention is not only electrical and electronic equipment, but also general buildings, such as medical facilities, industrial facilities, military facilities, such as hospitals and the like, general offices, houses, etc., where the damage of the precision equipment may be affected by electromagnetic waves.
- the demand prospect of the electromagnetic shielding sheet proposed by the present invention is very bright.
- the method according to the invention and the electromagnetic wave shielding sheet thus obtained have the following advantages.
- the metal nanoparticles may be disposed inside to prevent oxidation of the metal as well as to secure conductivity.
- the surface layer is easily oxidized to form an oxide in the case of metal, mechanical strength and EMI (Electromagnetic radio frequency interference / Radio frequency interference) shielding ability are deteriorated, but the surface oxidation phenomenon is obtained by using the electromagnetic shielding and absorbing material of the present invention. Since it does not occur, the phenomenon of electromagnetic wave shielding ability is not lowered.
- EMI Electromagnetic radio frequency interference / Radio frequency interference
- the carbon composite fiber having a core-shell structure is applied as it is in the form of a web or pulverized, and various processing processes as the electromagnetic shielding sheet together with the resin are possible. That is, it can be applied in various forms of web or gong according to the field to be applied.
- desired physical properties as an electromagnetic shielding sheet can be obtained by adjusting the mixing ratio of the metal nanomaterial and the resin to be added.
- the process control is easy and the physical properties of the final obtained article can be controlled, the shielding reliability and productivity as an electromagnetic shielding sheet is excellent.
- the first and second spinning solutions were connected to the inside and the outside of the dual nozzle, respectively, and then placed in a syringe pump, and then fixed at a flow rate of 0.005 ml / h.
- the collector and the spinneret were positioned vertically, and the collector was designed and prepared as a conductive metal electrode.
- the distance between the spinneret and the collector was fixed at 15 cm, and a voltage was applied at 15 kV to obtain a composite fiber having a web form (100-500 nm in diameter).
- the composite fiber was placed in a furnace and subjected to a carbonization process at 1000 ° C. for 3 hours to prepare a core-shell carbon composite fiber (Cu / CNF) having a web form.
- the obtained core-shell carbon composite fiber was impregnated with polymethyl methacrylate (PMMA) / DMF (10 wt% concentration) in the form of a web, and then dried at room temperature for 24 hours at 80 ° C. to prepare an electromagnetic shielding sheet.
- PMMA polymethyl methacrylate
- the core-shell carbon composite fiber having a web form prepared in Example 1 was ground to a length of 0.001 to 1 mm using a chop machine.
- the obtained chopped composite fiber was mixed with polymethyl methacrylate (PMMA) in a weight ratio of 1: 3, and then pressure was applied to prepare an electromagnetic shielding sheet through sheet molding.
- PMMA polymethyl methacrylate
- Example 3 Preparation of an electromagnetic shielding sheet containing Ag nanofibers in a core
- Example 2 The same procedure as in Example 1 was carried out using a solution (core) in which 5 g of Cu having a particle size of 20 to 40 nm was mixed in a 10 ml ethanol solution containing 3 g of AgNO 3 and 0.5 g of PVP as the first spinning solution. After the shell carbon composite fiber (Cu, Ag / CNF) was prepared, an impregnation process was performed to prepare an electromagnetic shielding sheet.
- core a solution in which 5 g of Cu having a particle size of 20 to 40 nm was mixed in a 10 ml ethanol solution containing 3 g of AgNO 3 and 0.5 g of PVP as the first spinning solution.
- an impregnation process was performed to prepare an electromagnetic shielding sheet.
- the core-shell carbon composite fiber (Cu, Ag / CNF) obtained in Example 3 was ground to a length of 0.001 to 1 mm using a chop machine.
- the obtained chopped composite fiber was mixed with polymethyl methacrylate (PMMA) in a weight ratio of 1: 3, and then pressure was applied to prepare an electromagnetic shielding sheet through sheet molding.
- PMMA polymethyl methacrylate
- Comparative Example 1 Manufacture of electromagnetic shielding sheet by simple mixing
- Comparative Example 2 Manufacture of electromagnetic shielding sheet by simple mixing
- EMI shielding (dB) was measured for the electromagnetic shielding performance at EMI 1GHz for a 100 ⁇ m thick sample (6X6).
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Abstract
Description
섬유 | 형태 | EMI 차폐성 | |
실시예 1 | Cu/CNF | 웹 | 55 |
실시예 2 | Cu.CNF | 촙트 | 50 |
실시예 3 | Cu, Ag/CNF | 웹 | 59 |
실시예 4 | Cu, Ag/CNF | 촙트 | 57 |
비교예 1 | Cu | - | 22 |
비교예 2 | Cu, CNF | 25 |
Claims (17)
- 탄소 섬유를 포함하는 외부 쉘; 및 그 내부에 섬유의 길이 방향으로 배치된 금속 나노 입자로 구성된 코어로 이루어진 코어-쉘 구조를 갖는 탄소 복합 섬유와 수지를 포함하는 것을 특징으로 하는 전자파 차폐 시트.
- 제1항에 있어서, 상기 금속 나노 입자는 Al, Fe, Cr, Ni, Cu, Ag, Au, Pt, Pd, Sn, Co, 스테인레스 및 이들의 조합으로 이루어진 군에서 선택된 1종의 금속 나노 입자 포함하는 것을 특징으로 하는 전자파 차폐 시트.
- 제1항에 있어서,상기 금속 나노 입자는 평균 입경이 10∼100nm인 것을 특징으로 하는 전자파 차폐 시트.
- 제1항에 있어서, 상기 탄소 섬유는 직경이 1nm∼100㎛인 것을 특징으로 하는 전자파 차폐 시트.
- 제1항에 있어서, 추가로 상기 코어는 Al, Fe, Cr, Ni, Cu, Ag, Au, Pt, Pd, Sn, Co, 및 이들의 조합으로 이루어진 군에서 선택된 1종의 금속을 포함하는 금속 나노 섬유를 포함하는 것을 특징으로 하는 전자파 차폐 시트.
- 제5항에 있어서, 상기 금속 나노 섬유는 직경이 10 내지 1000nm인 것을 특징으로 하는 전자파 차폐 시트.
- 제1항에 있어서, 상기 수지는 폴리아미드계 수지, 폴리에스테르계 수지, 폴리아세탈계 수지, 폴리카보네이트계 수지, 폴리(메타)아크릴레이트계 수지, 폴리비닐클로라이드계 수지, 폴리에테르계 수지, 폴리설파이드계 수지, 폴리이미드계 수지, 폴리술폰계 수지, 폴리올레핀계 수지, 방향족 비닐계 수지, 및 이들의 조합으로 이루어진 군에서 선택된 1종을 포함하는 것을 특징으로 하는 전자파 차폐 시트.
- 제1항에 있어서, 상기 탄소 복합 섬유는 웹 형태 또는 촙트(chopped) 된 것을 특징으로 하는 전자파 차폐 시트.
- (단계 1) 금속 나노 입자를 포함하는 제1방사 용액과, 탄소 전구체를 포함하는 제2방사 용액을 준비하는 단계;(단계 2) 상기 제1방사 용액과 제2방사 용액을 이중 노즐이 구비된 전기방사 장치에 주입한 후 전기방사 공정을 수행하여 웹 형태를 갖는 복합 섬유를 제조하는 단계, 이때 상기 제1방사 용액은 내측 노즐에, 제2방사 용액은 외측 노즐에 주입하고;(단계 3) 상기 복합 섬유를 탄화하여 탄소 복합 섬유를 제조하는 단계, 이때 상기 탄소 복합 섬유는 탄소 섬유로 이루어진 외부 쉘과 그 내부에 탄소 섬유의 길이 방향으로 배치된 금속 나노 입자로 구성된 코어로 이루어진 코어-쉘 구조를 가지며; 및(단계 4) 상기 탄소 복합 섬유를 수지와 혼합하여 시트 가공하는 단계를 포함하는 것을 특징으로 하는 전자파 차폐 시트의 제조방법.
- 제9항에 있어서, 상기 제1방사 용액은 금속 나노 섬유 제조를 위한 금속 전구체, 캐핑제, 및 용매를 더욱 포함하는 것을 특징으로 하는 전자파 차폐 시트의 제조방법.
- 제10항에 있어서, 상기 금속 전구체는 Al, Fe, Cr, Ni, Cu, Ag, Au, Pt, Pd, Sn, Co, 및 이들의 조합으로 이루어진 군에서 선택된 1종의 금속을 포함하는 산화물, 질화물, 할로겐화물, 알콕시화물, 시아닌, 황화물, 아미드, 시안화물, 수소화물, 과산화물, 포르핀, 수화물, 수산화물, 또는 에스테르화물인 것을 특징으로 하는 전자파 차폐 시트의 제조방법.
- 제10항에 있어서, 상기 캐핑제는 폴리비닐피롤리돈(PVP), 폴리에틸렌옥사이드(PEO), 폴리비닐알코올(PVA), 폴리비닐리덴플루오라이드(PVDF), 폴리비닐아세테이트(PVAc) 폴리아크릴로니트릴(PAN), 폴리아미드(PA), 폴리아크릴아미드(PAA), 폴리우레탄(PU), 폴리(에테르이미드)(PEI), 폴리벤즈이미다졸(PBI), 및 이들의 조합으로 이루어진 군에서 선택된 1종을 포함하는 것을 특징으로 하는 Ag 나노 섬유의 제조방법.
- 제9항에 있어서, 상기 탄소 전구체는 폴리아크릴로니트릴(PAN), 폴리퍼퓨릴 알콜, 셀룰로오스, 수크로오스, 글루코오스, 폴리비닐클로라이드, 폴리아크릴산, 폴리락트산, 폴리에틸렌옥사이드, 폴리피롤, 폴리이미드, 폴리이미드, 폴리아미드이미드, 폴리아라미드, 폴리벤질이미다졸, 폴리아닐린, 폴리프로필렌, 레조르시놀-포름알데히드 수지, 페놀 수지, 멜라민-포름알데히드 수지, 피치류로 및 이들의 조합으로 이루어진 군에서 선택된 1종을 포함하는 것을 특징으로 하는 전자파 차폐 시트의 제조방법.
- 제9항에 있어서, 상기 금속 나노 입자와 탄소 전구체는 1:1 내지 1:100의 중량비를 갖는 것을 특징으로 하는 전자파 차폐 시트의 제조방법.
- 제9항에 있어서, 상기 전기방사는 방사구와 수집기 사이에 전압을 5∼50kV에서 수행하고, 이들을 5∼20cm 이격하여 배치하고, 방사 용액 유량을 0.05 ml/h∼5 ml/h에서 수행하고, 방사구 직경은 코어에 0.01∼1mm, 외부에 0.05∼3mm인 것을 사용하여 수행하는 것을 특징으로 하는 전자파 차폐 시트의 제조방법.
- 제9항에 있어서, 상기 시트 가공은 탄소 복합 섬유를 웹 형태로 사용하거나, 이를 분쇄한 촙트(chopped) 탄소 복합 섬유 형태로 사용하는 것을 특징으로 하는 전자파 차폐 시트의 제조방법.
- 제9항에 있어서, 상기 시트 가공은 탄소 복합 섬유를 수지에 함침시키는 공정으로 수행하거나, 수지와 혼합하여 사출 성형하거나, 수지와 혼합하여 압출 성형하는 것을 특징으로 하는 전자파 차폐 시트의 제조방법.
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2013
- 2013-05-21 KR KR1020130057044A patent/KR101468018B1/ko active IP Right Grant
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2014
- 2014-05-21 CN CN201480029318.0A patent/CN105230146B/zh active Active
- 2014-05-21 WO PCT/KR2014/004516 patent/WO2014189270A1/ko active Application Filing
- 2014-05-21 US US14/892,602 patent/US20160095265A1/en not_active Abandoned
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2017
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CN105174211A (zh) * | 2015-10-12 | 2015-12-23 | 海南大学 | 一种具有表面增强拉曼活性银基复合纳米材料的制备方法及其所得产品和应用 |
CN114481364A (zh) * | 2021-12-31 | 2022-05-13 | 江苏大学 | 一种Janus型电磁耦合微波吸收剂及制备方法 |
CN115594161A (zh) * | 2022-09-02 | 2023-01-13 | 慧迈材料科技(广东)有限公司(Cn) | 一种基于聚酰亚胺的多孔磁性碳材料及其制备方法 |
CN117507543A (zh) * | 2023-09-11 | 2024-02-06 | 苏州羽燕特种材料科技有限公司 | 一种tpu高阻隔复合织物的制备方法 |
Also Published As
Publication number | Publication date |
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US20180054926A1 (en) | 2018-02-22 |
KR20140136689A (ko) | 2014-12-01 |
US20160095265A1 (en) | 2016-03-31 |
KR101468018B1 (ko) | 2014-12-02 |
CN105230146B (zh) | 2019-02-01 |
CN105230146A (zh) | 2016-01-06 |
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