WO1999010598A1 - Tole de graphite deploye pour blindage contre les ondes electromagnetiques et son procede de fabrication - Google Patents

Tole de graphite deploye pour blindage contre les ondes electromagnetiques et son procede de fabrication Download PDF

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Publication number
WO1999010598A1
WO1999010598A1 PCT/JP1998/003794 JP9803794W WO9910598A1 WO 1999010598 A1 WO1999010598 A1 WO 1999010598A1 JP 9803794 W JP9803794 W JP 9803794W WO 9910598 A1 WO9910598 A1 WO 9910598A1
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WO
WIPO (PCT)
Prior art keywords
expanded graphite
electromagnetic wave
wave shielding
graphite sheet
producing
Prior art date
Application number
PCT/JP1998/003794
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English (en)
Japanese (ja)
Inventor
Toshiki Kusuyama
Hideki Inomoto
Original Assignee
Toyo Tanso Kabushiki Kaisya
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyo Tanso Kabushiki Kaisya filed Critical Toyo Tanso Kabushiki Kaisya
Publication of WO1999010598A1 publication Critical patent/WO1999010598A1/fr

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Classifications

    • 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
    • H05K9/0083—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive non-fibrous particles embedded in an electrically insulating supporting structure, e.g. powder, flakes, whiskers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/26—Polyamides; Polyimides
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments

Definitions

  • the present invention relates to a method for manufacturing an expanded graphite sheet for electromagnetic wave shielding and an expanded graphite sheet for electromagnetic wave shielding, and more particularly to a method for manufacturing a graphite sheet for electromagnetic wave shielding from expanded graphite, and a graphite sheet for electromagnetic wave shielding comprising expanded graphite.
  • a method for manufacturing a graphite sheet for electromagnetic wave shielding from expanded graphite and a graphite sheet for electromagnetic wave shielding comprising expanded graphite.
  • expanded graphite sheets are originally made of graphite, and therefore have good electromagnetic wave shielding properties.
  • the expanded graphite sheet is manufactured by simply laminating flake-shaped expanded graphite, its mechanical strength is low, and there is a problem in handling at the construction site, and it is not practically used. .
  • the method of Japanese Patent Publication No. Hei 7-19995 has been proposed, and several other measures have been shown, but each has advantages and disadvantages. It does not respond to requests.
  • the electromagnetic wave shielding property is based on the surface condition of the sheet, and does not largely change depending on the thickness of the sheet.
  • the object of the present invention is to (A) compress expanded graphite expanded on average by 50 times or more so as to have a bulk density of 0.02 to 2.0 g / cm 3 , and pulverize the expanded graphite particles; ) Aramide pulp fibers fibrillated to give a specific surface area of 3. On ⁇ Zg or more; (C) rubber latex as a binder; and (D) inorganic fibers or (and) conductive fillers. This is mainly solved by suspending the slurry in water to form a slurry for papermaking, and wet-papermaking the slurry to form a sheet.
  • the problem can be solved by using an expanded graphite sheet with an ⁇ * Q * cm or less (measured by the voltage drop method) and an absolute value of the electromagnetic wave shielding effect of 60 dB or more as a material for electromagnetic wave shielding.
  • the electromagnetic wave shielding effect at this time is measured under the conditions of TEM-cell method.
  • RBW 1K, 1000MHz.
  • the manufacturing method of the present invention basically has the following aspects.
  • this embodiment (a) is a basic embodiment of the present invention, and the other embodiments (mouth) to (h) are particularly preferred embodiments of the above (a).
  • the expanded graphite is first compressed to a predetermined bulk density.
  • Expanded graphite which has expanded 50 times or more compared to the conventional method, cannot be made into a slurry because even if it is ground, it cannot be uniformly suspended in water and turned into a slurry, and floats on the surface of water.
  • a method using a small amount of a hydrophilic solvent such as acetone is also known, but this method is also not a desirable method since graphite particles tend to float on water. Therefore, even if it is made as it is, a uniform sheet cannot be obtained, and even if it can be made, the mechanical strength is extremely small and cannot be put to practical use at all.
  • the expanded graphite particles are first used in an amount of 0.02 to 2.OgZcm 3 , preferably 0.02 to 1.6 g / cm 3 , more preferably 0.05 to 1.0 g / cm 3 . Compress to bulk density.
  • the bulk density is lower than 0.02gZcm 3!
  • the expansion gas in the cavities of the expanded graphite particles is hard to escape, and the raw material remains in a floating state even if the raw material is stirred and pulverized in water. If the bulk density is larger than 2.0 sm 3 , it tends to be difficult to form a uniform sheet.
  • any means for compressing the expanded graphite expanded 50 times or more can be used in principle as long as it can achieve a predetermined bulk density.
  • Compression means which is continuously tightened by a combination of inclined conveyors is preferred.
  • expanded graphite use those expanded 5 times or more on average. Therefore, it is possible to use graphite particles that have expanded to 50 mm or more, or to have 50 times or less expanded graphite and 50 times or more expanded graphite. It may be used by mixing it with graphite so that it becomes 50 times or more as a whole. However, if it is less than 50 times on average, the flexibility and the shielding properties of the target sheet will be reduced.
  • the compacted graphite is then ground.
  • the pulverization can be either wet or dry.
  • the compressed graphite is pulverized in a state of being mixed with water in advance, and the obtained pulverized product is used as it is in the next slurry preparation without separation from water.
  • a mixer type pulverizer is preferably used as the pulverizing means, but a beater used in the papermaking field may be used.
  • the size of the pulverized material is usually 50 mesh or less, preferably about 60 to 100 mesh.
  • the aramid pulp As the aramid pulp, a conventionally known one can be used, for example, the one described in JP-A-4-240295. Further details are described below.
  • aramide pulp used in the present invention has an effect of fixing expanded graphite particles in water and uniformly dispersing them without separating even if diluted to a concentration required for papermaking. This is one important point for obtaining an expanded graphite sheet that is thin but has high strength. In order to satisfy this condition, aramide pulp must have the following characteristics.
  • the fibers Beating the fibers to promote fibrillation and increase the specific surface area of the fibers to 3.0 m 2 / g or more. Since the specific surface area of the expanded graphite particles is large, the fiber for fixing the expanded graphite particles must also be fibrillated to have a specific surface area of 3.0 m 2 Zg or more to facilitate physical adsorption. Pulped para- and meta-aramid fibers meeting the above conditions are effective.
  • the aramide fibers themselves are known, and various kinds of conventionally known aramide fibers can also be used in the present invention.
  • This conventional aramide fiber is fibrillated and used so as to have a predetermined specific surface area.
  • the fibrilich means is not particularly limited, and ordinary means is employed.
  • the specific surface area must be at least 3.0 m 2 Z g, preferably 10.0 to 20.0 m 2 Z g.If the specific surface area is less than 3.0 m 2 Z g, graphite particles cannot be sufficiently fixed. Not desirable.
  • the amount of the aramide fiber used in the slurry is 3 to 25 parts by weight, preferably 5 to 10 parts by weight. In the present invention, rubber latex is used as the binder.
  • This rubber latex Due to its high flexibility, it is a convenient binder for the purpose of thinning the sheet and increasing the mechanical strength.
  • latexes such as SBR, NBR, and acrylic rubber can be exemplified, and commercially available products include various grades manufactured by Zeon Corporation.
  • inorganic fibers or (and) conductive fillers are used.
  • inorganic fibers and conductive fillers it is possible to obtain a sheet that is thin but has good electromagnetic wave shielding properties.
  • the inorganic fibers include conductive fibers and non-conductive fibers.
  • Various fibers can be used as these inorganic fibers, for example, asbestos fibers, glass fibers, ceramic fibers, mineral wool, quartz fibers, Examples include silica fiber, alumina silicate fiber, alumina fiber, zirconia fiber, boron nitride fiber, alkali titanate fiber, boron fiber, carbon fiber, metal fiber, sepiolite, and the like.
  • metal fibers are preferable since they have particularly good electromagnetic wave shielding properties.
  • the conductive filler used in the present invention can be used alone or in combination with inorganic fibers.
  • the filling agent include carbon black, amorphous metal powder and the like. Particularly, carbon black is preferable.
  • a dispersant may be used to improve the dispersion of the fibers.
  • each of the above materials is suspended in water to form a slurry for papermaking.
  • the mixing ratio of each material is 60 to 95 parts by weight of expanded graphite particles and 3 parts by weight of aramide pulp. 25 to 25 parts by weight, binder is 1 to 20 parts by weight, inorganic fiber or (and) conductive filler is:! Consists of ⁇ 1 1 parts by weight. Since these raw material liquids have expanded graphite particles fixed with pulp as a core, even if the raw material liquid is diluted, it is uniformly dispersed without separation and does not float on water. Therefore, a high-strength sheet can be obtained by using a papermaking apparatus.
  • the wet papermaking method is usually adopted, and the conditions and loading dust of the wet papermaking method itself are conventionally adopted as they are.
  • the graphite particles of ( ⁇ ) and the aramidopa of ( ⁇ ) are used as described above. It is essential to use a rubber, a rubber latex of (C) and an inorganic fiber of (D) or (and) a conductive filler.
  • add the material of (D) to each material of (A) to (C) This makes it possible to obtain a thin sheet having good electromagnetic wave shielding properties.
  • the above-mentioned components (A) to (C) are used, which is compared with the conventional sheet.
  • the (D) material to this as in the present invention, a sheet that is thinner and has better electromagnetic wave shielding properties and flexibility can be manufactured.
  • the embodiment of (mouth) is an embodiment in which when a non-conductive fiber is used as the inorganic fiber, a conductive filler is used in combination. This is because the sheet of the present invention is for electromagnetic wave shielding.
  • the embodiment (c) uses a rubber latex as a binder, particularly one having a glass transition temperature (T g) of ⁇ 25 ° C. or less.
  • T g glass transition temperature
  • the use of such a rubber latex exerts particularly excellent effects in terms of workability and maintaining stability after the execution.
  • the sheet of the present invention manufactured using a material having a glass transition temperature of ⁇ 25 ° C. or less has an elongation at break of 5 to 6%, is excellent in flexibility, and as a result Handling at the time becomes even easier, and the stability after implementation is excellent.
  • the sheet of the present invention produced using a rubber latex having a glass transition temperature higher than 125 ° C has a slightly smaller elongation and flexibility than those described above, As a result, the ease of handling and the stability after the treatment are slightly inferior.
  • Examples of the rubber latex having a glass transition temperature (T g) of ⁇ 25 ° C. or lower include an acrylate copolymer latex “Nipo 1.LX874” manufactured by Zeon Corporation.
  • the embodiment (2) uses a latex usually called a soap-free rubber latex as a rubber latex as a binder.
  • a latex is formed using an emulsifier, but this soap-free rubber latex does not contain any commonly used emulsifier. Can be exemplified.
  • various other commercially available products can be used. By using this soap-free rubber latex, the mechanical strength of the obtained target product is improved, and a thinner and stronger sheet is obtained as compared with the case where another rubber latex is used.
  • the conductive fiber In the mode (e), only the conductive fiber is used, and since the fiber itself has conductivity, the desired electromagnetic wave shielding property can be obtained without using a conductive filler.
  • the conductive fiber and the conductive filler are used in combination, and the desired effect is exhibited even when used alone. Demonstrate.
  • carbon fiber various fibers can be used, and examples thereof include bread-based carbon fiber, pitch-based carbon fiber, and other carbon whiskers.
  • a pitch-based carbon fiber is selectively used among these various carbon fibers.
  • This pitch-based carbon fiber is a carbon fiber using pitch as a raw material, and is easily entangled because the fiber is curled, and has extremely good conductivity.
  • the expanded graphite sheet of the present invention has the following physical properties.
  • this sheet is made of expanded graphite as a main component, and is made of other components as already described above.
  • This sheet is extremely excellent as a material for shielding electromagnetic waves.
  • Electromagnetic wave shield ⁇ It has physical properties enough to be used as a sheet. From these two physical properties, it was also found that the sheet of the present invention was excellent in flexibility and that the handleability was also excellent.
  • FIG. 1 is a graph showing the electromagnetic wave shielding properties of a conventional expanded graphite sheet.
  • FIG. 2 is a graph showing the electromagnetic wave shielding properties of the comparative expanded graphite sheet in Table 1.
  • FIG. 3 is a graph showing the electromagnetic wave shielding properties of the expanded graphite sheet of the present invention containing B—in Table 1.
  • FIG. 4 is a graph showing the electromagnetic shielding properties of the expanded graphite sheet of the present invention containing C— in Table 1.
  • FIG. 5 is a graph showing the electromagnetic wave shielding properties of the expanded graphite sheet of the present invention containing D- in Table 1.
  • FIG. 6 is a graph showing the electromagnetic wave shielding properties of the expanded graphite sheet of Example 4 in Table 4.
  • FIG. 7 is a graph showing the electromagnetic wave shielding properties of the expanded graphite sheet of Example 5 in Example 4.
  • the expanded graphite sheet of the present invention is widely used as a material for shielding electromagnetic waves, particularly as a sheet where electromagnetic waves need to be shielded, and greatly contributes to the industry.
  • the preparation of the sample is as follows.
  • a predetermined amount of 200 parts of water, aramid fiber and Rupu (made by Akzo) are put into a mixer, stirred for about 5 minutes to beat the pulp, and dropped into a compounding chest together with 300 parts of water. (At this time, the specific surface area of the pulp is 14 m 2 / g). On the other hand, the graphite particles expanded 150 times were compressed to a sponge shape so that the bulk density became 0.2 gZ cm 3 . This raw material was stirred in a mixer together with 2000 parts of water for about 10 minutes, pulverized, dropped into a platform chest, and mixed with the aramide pulp.
  • the particles of the expanded graphite were agglomerated with the alum and the core as a nucleus, and a uniform dispersion was obtained. Further, a predetermined amount of rubber latex (manufactured by ZEON CORPORATION) was added in terms of solid content, and the mixture was fixed by stirring for 3 to 4 minutes.
  • This raw material was placed in a tank provided with a paper net, uniformly dispersed, and then drained to form a sheet. Further, the water was squeezed with a suction pump, and the felt was pressed with a gouge press and dewatered. This sheet was placed in an oven at 120 ° C. and dried, and the density of the sheet was adjusted to a predetermined value through a calender roll.
  • Samples were prepared by the above-mentioned method while varying the basic formulations shown in the following (i) to (iv), and the amounts of each formulation.
  • Rubber latex (manufactured by Zeon Corporation, S X-150 3) 5%
  • Rubber latex (SX-1503, manufactured by Zeon Corporation)
  • Rubber latex (manufactured by Zeon Corporation, SX-1503) 5%
  • PF-35 is a 100% expanded graphite sheet. It has a thickness of 0.35 mm and a density of 1. OgZcm 3 .
  • the tensile strength and breakage at break were measured by a material testing machine.
  • the measurement conditions are a tensile speed of 50 mrnZmin.
  • the surface resistance was measured by the voltage drop method.
  • the evaluation of flexibility was based on the following criteria.
  • FIG. 2 shows the electromagnetic shielding properties of the expanded graphite sheet of the comparative example
  • FIGS. 3 to 5 show the electromagnetic shielding properties of the expanded graphite sheet of the present invention
  • the vertical axis represents the electromagnetic wave shielding performance in terms of L oss (dB)
  • the horizontal axis represents the frequency of the electromagnetic wave.
  • the electromagnetic shielding properties in 1 0 0 0 MH z of the expanded graphite sheet one Bok of Comparative Example - 5 5 'are 5 9 d B does not reach the over 6 0 d B .
  • the electromagnetic wave shielding property at 1 0 0 0 MH z expanded graphite sea Bok of the present invention is in the range one 6 0-1 8 0 d B, Even at the lowest case, it is 160 dB, which indicates that the electromagnetic wave shielding property is excellent.
  • the comparative example is inferior in the electromagnetic wave shielding property, and also inferior in mechanical strength and flexibility, and the conventional example is excellent in the electromagnetic wave shielding property, but very poor in mechanical strength and flexibility.
  • Sheets were produced by the same production method as in Example 1 using the prescribed raw materials and prescribed blends shown in Table 2 (no filler). The physical properties were measured. Table 2 shows the results. However, bread carbon fiber (manufactured by Toray Industries, Inc.) was used as the carbon fiber. In this example, the characteristics of the sheet were examined when the amount of the reinforcing material was changed (increased) to improve the handling.
  • Sheets were produced in the same manner as in Example 1 using the prescribed raw materials and the mixing ratios shown in Table 3 (without filler). Table 3 shows the results. However, pitch carbon fibers were used as the carbon fibers. As can be seen from this example, although the amount of carbon fiber added was smaller than in Example 2, the electromagnetic wave shielding properties were almost the same as in Example 2, and the flexibility was excellent. [Table 3-1]
  • Sheets were produced in the same manner as in Example 1 using the specified raw materials and the mixing ratios shown in Table 4 (without filler). Table 4 shows the results. However, pitch carbon fibers were used as the carbon fibers. As can be seen from this example, the glass transition temperature (Tg) was 31 ° C compared to Example 4 in which the glass transition temperature (Tg) was higher than 125 ° C as the rubber latex of the binder. In Example 5 using C, the elongation was as large as 5 to 6%. [Table 4]
  • each of the binders of Examples 4 and 5 in Table 4 above is “SX1503” (manufactured by Zeon Corporation) in Example 4 having a glass transition temperature higher than ⁇ 2 ° C.
  • Example 5 is “N ipo 1. LX84 ”(manufactured by Zeon Corporation, Tg-31 ° C).

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

L'invention concerne une tôle de graphite déployé, capable de former un blindage fin contre les ondes électromagnétiques, ce blindage présentant une excellente résistance mécanique en dépit de sa faible épaisseur. Ce blindage peut en outre être manipulé facilement et donc être utilisé dans de nombreuses industries. Le procédé de fabrication de ce blindage consiste: à mettre en suspension des particules de graphite, obtenues à partir de graphite déployé au moins 50 fois en moyenne; à comprimer ce graphite déployé jusqu'à une masse volumique apparente variant entre 0,02 et 2,0 g/cm3; à pulvériser ce comprimé; et à mettre en suspension ce comprimé pulvérisé avec une pâte aramide, produite par fibrillation de fibres de pâte aramide de manière à obtenir une surface spécifique supérieure ou égale à 3,0 m2/g, ainsi qu'avec un latex d'élastomère-caoutchouc en tant que liant et au moins des fibres inorganiques ou une matière de charge conductrice, cette mise en suspension s'effectuant dans de l'eau afin de fabriquer une boue. Ce procédé de fabrication consiste enfin à former une tôle à partir de cette boue, par une attaque en milieu acide.
PCT/JP1998/003794 1997-08-26 1998-08-26 Tole de graphite deploye pour blindage contre les ondes electromagnetiques et son procede de fabrication WO1999010598A1 (fr)

Applications Claiming Priority (2)

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JP9/246152 1997-08-26
JP24615297 1997-08-26

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WO1999010598A1 true WO1999010598A1 (fr) 1999-03-04

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1783097A1 (fr) * 2004-08-27 2007-05-09 Toyo Tanso Co., Ltd. Feuille de graphite exfolié
JP2008542557A (ja) * 2005-05-26 2008-11-27 イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー 導電性アラミド紙
DE112007000823T5 (de) 2006-04-05 2009-02-05 Japan Matex Co., Ltd., Sennan-shi Graphit-Ton-Verbundmaterial, Verfahren zum Herstellen desselben, Dichtung oder Packung, welche das Verbundmaterial umfasst und eine Tondispersion, die für das Verbundmaterial verwendet wird
CN102936867A (zh) * 2012-11-14 2013-02-20 沈阳华天鑫碳纤维电热制品有限公司 燃料电池电极多孔扩散层材料碳纤维纸的制备工艺
US20210086474A1 (en) * 2018-05-03 2021-03-25 Skc Co., Ltd. Multilayer graphite sheet with excellent electromagnetic shielding capability and thermal conductivity and manufacturing method therefor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5982497A (ja) * 1982-11-01 1984-05-12 株式会社　興人 導電紙
JPH04240295A (ja) * 1991-01-23 1992-08-27 Toyo Tanso Kk 膨張黒鉛シートの製造法
JPH08209584A (ja) * 1995-01-27 1996-08-13 Teijin Ltd 導電性アラミド紙およびその製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5982497A (ja) * 1982-11-01 1984-05-12 株式会社　興人 導電紙
JPH04240295A (ja) * 1991-01-23 1992-08-27 Toyo Tanso Kk 膨張黒鉛シートの製造法
JPH08209584A (ja) * 1995-01-27 1996-08-13 Teijin Ltd 導電性アラミド紙およびその製造方法

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1783097A1 (fr) * 2004-08-27 2007-05-09 Toyo Tanso Co., Ltd. Feuille de graphite exfolié
EP1783097A4 (fr) * 2004-08-27 2010-03-24 Toyo Tanso Co Feuille de graphite exfolié
JP2008542557A (ja) * 2005-05-26 2008-11-27 イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー 導電性アラミド紙
DE112007000823T5 (de) 2006-04-05 2009-02-05 Japan Matex Co., Ltd., Sennan-shi Graphit-Ton-Verbundmaterial, Verfahren zum Herstellen desselben, Dichtung oder Packung, welche das Verbundmaterial umfasst und eine Tondispersion, die für das Verbundmaterial verwendet wird
US8647744B2 (en) 2006-04-05 2014-02-11 National Institute Of Advanced Industrial Science And Technology Graphite clay composite material, process for producing the same, gasket or packing comprising the composite material, and clay dispersion used for the composite material
CN102936867A (zh) * 2012-11-14 2013-02-20 沈阳华天鑫碳纤维电热制品有限公司 燃料电池电极多孔扩散层材料碳纤维纸的制备工艺
US20210086474A1 (en) * 2018-05-03 2021-03-25 Skc Co., Ltd. Multilayer graphite sheet with excellent electromagnetic shielding capability and thermal conductivity and manufacturing method therefor
US11745463B2 (en) * 2018-05-03 2023-09-05 Skc Co., Ltd. Multilayer graphite sheet with excellent electromagnetic shielding capability and thermal conductivity and manufacturing method therefor

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