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WO2018110942A1 - Matériau flexible de blindage contre les ondes électromagnétiques, module de circuit de type à blindage contre les ondes électromagnétiques le comprenant et dispositif électronique équipé de ce dernier - Google Patents

Matériau flexible de blindage contre les ondes électromagnétiques, module de circuit de type à blindage contre les ondes électromagnétiques le comprenant et dispositif électronique équipé de ce dernier Download PDF

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Publication number
WO2018110942A1
WO2018110942A1 PCT/KR2017/014553 KR2017014553W WO2018110942A1 WO 2018110942 A1 WO2018110942 A1 WO 2018110942A1 KR 2017014553 W KR2017014553 W KR 2017014553W WO 2018110942 A1 WO2018110942 A1 WO 2018110942A1
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WO
WIPO (PCT)
Prior art keywords
conductive
electromagnetic shielding
shielding material
fiber
fibrous web
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PCT/KR2017/014553
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English (en)
Korean (ko)
Inventor
서인용
정의영
이준우
Original Assignee
주식회사 아모그린텍
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
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Application filed by 주식회사 아모그린텍 filed Critical 주식회사 아모그린텍
Priority to CN201780077039.5A priority Critical patent/CN110089208B/zh
Priority to US16/468,894 priority patent/US11528833B2/en
Priority claimed from KR1020170170429A external-priority patent/KR102045018B1/ko
Publication of WO2018110942A1 publication Critical patent/WO2018110942A1/fr

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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
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • 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

Definitions

  • the present invention relates to an electromagnetic shielding material, and more particularly, a flexible electromagnetic shielding material capable of expressing heat dissipation performance and electromagnetic shielding performance together with excellent flexibility, elasticity, and wrinkle / recoverability, and an electromagnetic shielding circuit module including the same and the same. It relates to an electronic device provided.
  • Electromagnetic waves are a phenomenon in which energy moves in a sinusoidal shape while an electric field and a magnetic field interoperate with each other, and are useful for electronic devices such as wireless communication and radar.
  • the electric field is generated by a voltage and easily shielded by a distance or an obstacle such as a tree, while the magnetic field is generated by a current and is inversely proportional to the distance but not easily shielded.
  • the electromagnetic shielding material is typically made of a conductive material, and the electromagnetic radiation emitted toward the electromagnetic shielding material is reflected back from the electromagnetic shielding material or flows to the ground to shield the electromagnetic wave.
  • an example of the electromagnetic shielding material may be a metal case or a metal plate, such an electromagnetic shielding material is difficult to express flexibility, elasticity, and once manufactured, it is not easy to deform / restore to a variety of shapes in various applications There is a problem that cannot be easily employed.
  • electric wave shielding materials such as metal plates or metal thin films are difficult to be closely adhered to the components that are the source of electromagnetic waves or parts that need protection from the sources, and cracks may occur due to bending at the stepped or uneven portions, resulting in electromagnetic shielding performance. It may be difficult to express fully.
  • an electromagnetic shielding material in which a conductive coating layer is formed on a lightweight support member such as a polymer film has been recently introduced, but the electromagnetic shielding performance is limited according to the limitation of the area that can be coated on the support member.
  • Films with a certain thickness or more have a lack of flexibility and are difficult to be completely adhered to a stepped or uneven part, and after being manufactured in a specific shape, it may be difficult to freely deform the shape.
  • cracks, peeling, etc. occur frequently in the conductive coating layer coated during the shape deformation.
  • the present invention has been made to solve the above-described problems, and excellent flexibility, elasticity and crease / restoring, so that the shape can be freely transformed as desired, various shapes such as irregularities and steps of the application mounting surface where the electromagnetic shielding material is employed It is an object of the present invention to provide a flexible electromagnetic shielding material that can be provided to be completely in close contact with the structure.
  • another object of the present invention is to provide a flexible electromagnetic shielding material in which the deterioration of the electromagnetic shielding performance is prevented even in various shape changes.
  • Another object of the present invention is to provide a flexible electromagnetic shielding material which has not only an electromagnetic shielding performance but also excellent heat dissipation performance, which can be easily employed in various device components in which electromagnetic waves and heat generation are problematic.
  • the present invention is an electromagnetic shielding circuit module and an electronic device having an electromagnetic wave shielding circuit module that can be easily employed in a light and small sized or flexible electronic device having a component having a high density in a small area or having a heat generation problem Another purpose is to provide a device.
  • the present invention to solve the above problems, the conductive fiber web comprising a plurality of pores; And a heat dissipation unit provided in at least some of the pores.
  • the heat dissipation unit may include any one or more of a phase change compound and a thermally conductive filler.
  • the thermally conductive filler is a single-walled carbon nanotubes, double-walled carbon nanotubes, carbon nanotubes such as multi-walled carbon nanotubes, graphene, graphene oxide, graphite, carbon black, nickel, silver, copper, iron, gold
  • At least one conductive heat filler selected from the group consisting of aluminum, titanium alloys, platinum, chromium and carbon-metal composites, and silicon carbide, magnesium oxide, titanium dioxide, aluminum nitride, silicon nitride, boron nitride, aluminum oxide, silica, oxide Zinc, barium titanate, strontium titanate, beryllium oxide, manganese oxide, zirconia and boron oxide may include any one or more of any one or more insulating heat-resistant filler selected from the group consisting of.
  • the conductive fiber web may be formed with a conductive composite fiber including a fiber portion including a fiber forming component and a conductive portion coated on the outside of the fiber portion.
  • the fiber portion may further include a conductive filler.
  • the conductive filler may include any one or more of one or more metals and conductive polymer compounds selected from the group consisting of aluminum, nickel, copper, silver, gold, chromium, platinum, titanium alloys and stainless steel.
  • the conductive portion may be formed by including any one or more of at least one metal and a conductive polymer compound selected from the group consisting of aluminum, nickel, copper, silver, gold, chromium, platinum, titanium alloy and stainless steel.
  • the conductive polymer compound is polythiophene, poly (3,4-ethylenedioxythiophene) (poly (3,4-ethylenedioxythiophene)), polyaniline, polyacetylene, polyacetylene, polydiacetylene (polydiacetylene), poly (thiophenevinylene), polyfluorene (polyfluorene) and poly (3,4-ethylenedioxythiophene) (PEDOT): one selected from the group consisting of polystyrenesulfonate (PSS) It may contain the above.
  • PSS polystyrenesulfonate
  • the conductive part includes a first conductive part and a second conductive part sequentially coated on the outer surface of the fiber part, and the second conductive part is intentionally first conductive part in order to prevent property degradation due to cracks generated after stretching. It may be coated to penetrate between the cracks formed in the.
  • the conductive composite fiber may have a diameter of 0.2 ⁇ 10 ⁇ m.
  • the conductive fiber web may have a thickness of 5 to 200 ⁇ m, and a basis weight of 5 to 100 g / m 2.
  • the heat dissipation part may include 11 to 900 parts by weight based on 100 parts by weight of the conductive fiber web.
  • the conductive portion may have a thickness of 0.1 ⁇ 2 ⁇ m.
  • the conductive fibrous web may have a porosity of 30 to 80%.
  • a conductive adhesive layer may be provided on at least one surface of the conductive fibrous web.
  • the fiber forming component of the fiber portion is polyurethane (polyurethane), polystyrene (polystylene), polyvinyl alcohol (polyvinylalchol), polymethyl methacrylate (polymethyl methacrylate), polylactic acid (polylactic acid), polyethylene oxide (polyethyleneoxide), Polyvinyl acetate, polyacrylic acid, polycaprolactone, polyacrylonitrile, polyvinylpyrrolidone, polyvinylpyrrolidone, polyvinylchloride, polycarbonate, PC (polycarbonate), polyetherimide, polyesthersulphone, polybenzimidazol, polyethylene terephthalate, polybutylene terephthalate, and fluorine-based compounds have.
  • the fiber part may include polyvinylidene fluoride (PVDF) and polyurethane (polyurethane) in a weight ratio of 1: 0.2 to 2.0.
  • the heat dissipation portion is located inside the conductive fibrous web, the heat dissipation portion may not be located on some or all of the outer surface of the conductive fiber web, thereby preventing any degradation of the electromagnetic shielding performance due to the heat dissipation portion. Can be.
  • the present invention is a circuit board mounted element; And an electromagnetic shielding material according to the present invention provided on a circuit board to cover at least the upper and side portions of the device.
  • the present invention provides an electronic device including the electromagnetic shielding circuit module according to the present invention.
  • the electromagnetic shielding material according to the present invention is excellent in flexibility, elasticity and wrinkle / restoreability, and can be freely deformed as desired.
  • the surface of the electromagnetic shielding material is disposed so as to be completely attached even if the surface of the electromagnetic shielding material is placed in a curved shape such as irregularities or steps. It is possible to express excellent electromagnetic shielding performance. In addition, deterioration of the electromagnetic wave shielding performance can be prevented even with various shape changes. Furthermore, as the heat dissipation performance is excellent, the heat generated from the electromagnetic wave generation source can be quickly conducted and radiated.
  • the components are provided with high density in a small area, they can be provided in close contact with the mounted components by overcoming the dense spacing and the step difference between the components, so that they can be easily adopted in the light and small sized or flexible electronic devices. have.
  • FIG. 1 is a cross-sectional view of a flexible electromagnetic shielding material according to an embodiment of the present invention
  • FIG. 2 is a cross-sectional view of a conductive composite fiber included in an embodiment of the present invention
  • 3A and 3B are cross-sectional views of various conductive composite fibers included in one embodiment of the present invention.
  • FIG. 4A is a partial perspective view and a cross-sectional view taken along the line X-X ′ of a conductive composite fiber included in another embodiment of the present invention in which a conductive polymer compound is disposed on a surface portion of a fiber portion;
  • Figure 4b is a partial perspective view of the fiber portion not shown conductive portion in the conductive composite fiber included in another embodiment of the present invention
  • Figure 5 is a partial perspective view and a cross-sectional view taken along the border line X-X 'of the conductive composite fiber included in another embodiment of the present invention.
  • FIG. 6 is a cross-sectional view of the electromagnetic shielding circuit module according to an embodiment of the present invention.
  • the flexible electromagnetic shielding material 1000 includes a conductive fiber web 100 including a plurality of pores and a heat dissipation part 120 provided in some or all of the plurality of pores.
  • the conductive fibrous web 100 may further include a conductive adhesive layer 200 provided on one side or both sides of the conductive fiber web 100.
  • the conductive fibrous web 100 has a three-dimensional network structure and includes a plurality of pores.
  • the plurality of pores may be formed by being surrounded by conductive composite fibers 10, which is an example of forming the conductive fibrous web 100.
  • the porosity of the conductive fibrous web 100 may be 30 to 80%, and may be easily implemented as a flexible and flexible electromagnetic shielding material through the conductive fibrous web 100, and the heat dissipating part 120 may be properly formed in the conductive fibrous web 100. It can be provided in the pores.
  • the conductive fibrous web 100 may have an air permeability of 0.01 ⁇ 2cfm, if the air permeability is less than 0.01cfm when forming a conductive adhesive layer on any one surface of the conductive fibrous web, the conductive adhesive layer as pores of the fibrous web Impregnation of the formation composition may be difficult, and if it exceeds 2cfm, mechanical properties and electromagnetic shielding performance of the conductive fibrous web may be degraded.
  • the conductive fiber web 100 has a thickness of 5 ⁇ 200 ⁇ m, the basis weight may be 5 ⁇ 100g / m2. If the thickness of the conductive fibrous web is greater than 200 ⁇ m, it may not be easy to form the conductive portion of the conductive composite fiber that forms the conductive fibrous web 100 on the fibers included in the entire outer and inner regions of the fibrous web. There is a risk of deterioration of the stretch characteristics. In addition, when the thickness is less than 5 ⁇ m the mechanical strength of the conductive fibrous web is lowered, the handling becomes difficult, it may not be easy to manufacture.
  • the conductive fibrous web may be formed by stacking a single conductive fibrous web or a single conductive fibrous web.
  • a conductive adhesive layer for bonding each conductive fibrous web may be further interposed therebetween.
  • the conductive adhesive layer is replaced with the description of the conductive adhesive layer 200 to be described later.
  • the basis weight of the conductive fibrous web 100 is less than 5g / m2 the mechanical strength of the conductive fibrous web is reduced, the handling becomes difficult, may not be easy to manufacture, if the conductive fiber web exceeds 100g / m2 It may not be easy to form the conductive portion of the fiber in the fiber contained in the entire area outside and inside of the fibrous web, and there is a fear that the elastic properties are deteriorated.
  • the conductive composite fiber 10 which is an example of forming the conductive fiber web 100 described above, is coated on the outside of the fiber portion 11 and the fiber portion 11 including a fiber forming component as shown in FIG. It may include a conductive portion 12.
  • the fiber forming component provided in the fiber part 11 is a subject of forming a fiber or a fibrous web in a conductive composite fiber or a conductive fibrous web, and expresses elasticity, flexibility, and wrinkle / resilience of the fibrous web, and usually in fibrous form.
  • Known polymer compounds that can be formed can be used without limitation.
  • the fiber forming component is polyurethane (polyurethane), polystyrene (polystylene), polyvinyl alcohol (polyvinylalchol), polymethyl methacrylate (polymethyl methacrylate), polylactic acid (polylactic acid), polyethylene oxide (polyethyleneoxide), poly Polyvinyl acetate, polyacrylic acid, polycaprolactone, polyacrylonitrile, polyvinylpyrrolidone, polyvinylpyrrolidone, polyvinylchloride, polycarbonate, PC ( It may include one or more selected from the group consisting of polycarbonate, polyetherimide, polyesthersulphone, polybenzimidazol, polyethylene terephthalate, polybutylene terephthalate and fluorine-based compound .
  • the fluorine-based compound is polytetrafluoroethylene (PTFE) -based, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA) -based, tetrafluoroethylene-hexafluoropropylene copolymer (FEP) -based, Tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl vinyl ether copolymer (EPE) system, tetrafluoroethylene-ethylene copolymer (ETFE) system, polychlorotrifluoroethylene (PCTFE) system, chlorotrifluoro It may include any one or more compounds selected from the group consisting of a low ethylene-ethylene copolymer (ECTFE) system and a polyvinylidene fluoride (PVDF) system.
  • ECTFE low ethylene-ethylene copolymer
  • PVDF polyvinylidene fluoride
  • the fiber portion 11 is that the conductive fibrous web 100 is spun by blending the fluorine-based compound PVDF and polyurethane on the spinning solution in order to improve the flexibility, flexibility, heat resistance, chemical resistance and mechanical strength Can be.
  • PVDF and polyurethane may be included in a weight ratio of 1: 0.2 to 2, and more preferably 1: 0.4 to 1.5 weight ratio. If the polyurethane weight is less than 0.2 times based on the weight of PVDF, flexibility, elasticity, etc. may be lowered, which may cause tearing when the substrate is provided on the substrate having deformation or step difference in use.
  • the damage of the conductive fibrous web may be greater than the initial designed electromagnetic shielding performance.
  • the polyurethane weight is more than 2 times based on the weight of PVDF, the restoring force due to expansion and contraction is lowered, which may cause permanent deformation of the shape due to failure to restore to the state before stretching. Failure to reduce the spacing between cracks can cause degradation of electromagnetic shielding performance.
  • the chemical resistance is significantly lowered, and the fiber portion may be damaged during the formation of the metal shell. Accordingly, the mechanical properties such as the fiber part is cut off or the fiber web is torn due to the shape deformation of the conductive fiber web may be stretched or wrinkled. Can be degraded.
  • the fiber portion 11 further lowers the resistance of the conductive fiber web 100 and minimizes the increase in resistance in the longitudinal and / or thickness directions of the composite fiber due to unintentional cracking of the conductive portion, as shown in FIG. 3A.
  • the metal conductive filler 21b may be further provided. Crack (c) may occur in the conductive portion 22 of the conductive composite fiber 20 according to the stretching / crease of the electromagnetic shielding material, the crack (c) generated increases the resistance of the conductive composite fiber 20, and eventually As a result, electromagnetic wave shielding performance may be degraded.
  • the conductive filler 21b provided in the conductive composite fiber 20 may electrically connect the conductive portion 22 in which the crack c is generated, thereby minimizing or preventing an increase in resistance.
  • the conductive part 22 of the conductive composite fiber 20 is made of metal, cracks may occur very easily, thereby minimizing the increase in resistance through the conductive filler 21b, and electrically connecting the conductive fillers. According to the electromagnetic shielding performance can be expressed an increased effect.
  • the metallic conductive filler 21b may be used without limitation in the case of a known material having electrical conductivity, and as a non-limiting example, aluminum, nickel, copper, silver, gold, chromium, platinum, titanium alloy and stainless steel It may include one or more metals selected from the group consisting of.
  • the conductive filler 21b when the conductive filler 21b is a metal, it may be provided to occupy 10 to 50% of the total volume of the fiber part. If less than 10% of the total volume of the fiber portion, it may be difficult to prevent the resistance decrease due to the connection between the conductive fillers or increased resistance of the cracked metal shell portion. In addition, if more than 50% of the total volume of the fiber portion If the fiber portion is increased in the number of trimming during spinning, there is a fear that the mechanical strength is significantly reduced even when implemented as a fiber web.
  • the conductive filler 21b is not limited in shape, and may be employed without limitation in the case of a shape of a known conductive filler such as a spherical shape having a curved surface, a needle shape, or an amorphous shape.
  • it may be a rod type having a predetermined aspect ratio in order to prevent an increase in resistance due to cracking of the conductive portion 22 that may occur due to the shape deformation of the conductive fibrous web.
  • the aspect ratio may be 1.1 to 20, and if the aspect ratio is less than 1.1, it may be difficult to directly contact the metal shell portion in which the mutual contact and cracks between the conductive fillers occur, and in order to induce direct contact, the content of the filler in the fiber portion may be increased.
  • the mechanical strength of the conductive composite fiber may be significantly reduced.
  • the aspect ratio exceeds 20
  • the conductive filler penetrates the fiber part and damages the metal shell part, which may result in a decrease in electromagnetic shielding performance.
  • the rod-shaped conductive filler may have a diameter of 0.8 ⁇ m to 1.1 ⁇ m and a length of 1 ⁇ m to 5 ⁇ m.
  • the outer circumference may be a curved shape such as a circle or an ellipse, or may be a regular shape including a polygon such as a rectangle or a pentagon, or may be irregular.
  • the conductive filler may have a hollow shape that is continuous in the longitudinal direction at the same time as the outer circumference of the cross section perpendicular to the longitudinal direction is a regular shape or atypical shape. At this time, the conductive filler having a hollow has the advantage of expressing a lighter, more excellent stretch characteristics of the conductive fiber web.
  • the conductive filler is densely arranged inside the fiber portion and is not provided to expose the outer surface it may be difficult to prevent the increase in resistance due to cracks in the metal shell.
  • the conductive filler is preferably disposed toward the outer surface of the fiber as much as possible, it is not easy to adjust the position of the conductive filler when spinning the spinning solution containing the conductive filler. Accordingly, according to an embodiment of the present invention, the diameter of the conductive filler may be larger than that of the fiber that is radiated so that the conductive filler may be located on the outer surface of the fiber portion.
  • the fiber part 31 is provided with a conductive filler 31b in the longitudinal direction of the conductive composite fiber 30.
  • a second portion (A) having no portion (B) and no conductive filler (31b), wherein the diameter (h) of the second portion (A) and the diameter of the conductive filler (31b) are 1: 1 to 1.
  • the diameter of the conductive filler is less than one times the diameter of the second portion, the possibility of the conductive filler being exposed to the outside of the fiber portion is less, so it may not be possible to minimize the increase in resistance due to cracks generated in the conductive portion. .
  • the diameter of the conductive filler is included more than five times the diameter of the second portion, there is a fear of trimming during spinning, lowering the mechanical strength of the implemented composite fiber or fibrous web, conductive when the shape of the conductive fiber web is deformed The shape deformation width according to the contact between the pillars can be reduced.
  • the diameter of the conductive filler 31b if the conductive filler has a shape having an aspect ratio, the diameter of the conductive filler 31b compared with the second portion A may be a length of a short axis.
  • the conductive filler may have a diameter of 1 ⁇ 5 ⁇ m, through which the possibility of being exposed to the outside of the fiber portion has an advantage of preventing the reduction of the electromagnetic shielding efficiency. If the diameter is less than 1 ⁇ m there is a fear that the reduction of the electromagnetic shielding efficiency may not be minimized, if the diameter exceeds 5 ⁇ m there may be a fear of the fiber portion trimming during spinning, there may be a decrease in the mechanical strength of the fiber web.
  • the fiber portion may include conductive polymer compounds 41b and 41b 'as illustrated in FIGS. 4A and 4B, and the conductive polymer compound 41b may surround the fiber forming component 41a. It may be provided in the fiber portion 41 in the form (see FIG. 4A), or in the fiber portion 41 'in a form in which the conductive polymer compound 41b' and the fiber forming component 41a 'are irregularly mixed. (See FIG. 4B). In this case, the conductive polymer compounds 41b and 41b 'are exposed to the outer surface of the fiber portion 41 as shown in FIG. 4A, or at least a portion of the conductive polymer compounds 41b is exposed to the outer surface of the fiber portion 41' as shown in FIG. 4B.
  • the conductive polymer compound 41b in which the gap between the cracks of the conductive part is exposed on the outer surface of the fiber part 41b. , 41b ') can be electrically connected to prevent further degradation of the electromagnetic shielding performance.
  • the conductive polymer compounds 41b and 41b ' may be used without limitation in the case of a known polymer compound having electrical conductivity, and as an example thereof, a polymer resin including an electron withdrawing group may be used.
  • the electron withdrawing group is also referred to as an electron attracting group, and means an atomic group that attracts electrons from surrounding atomic groups by resonance or triggering effects.
  • the electron withdrawing group is an oxadiazole group, an azole group, a benzothiadiazole group, a cyano group, a quinoline group, a bornyl group, a silol group, a perfluorine group, a halogen group, a nitro group, a carbonyl group, a carboxyl group, a nitrile group, a halogenated alkyl group, an amino group And sulfonyl groups.
  • the conductive polymer compound may include polythiophene, poly (3,4-ethylenedioxythiophene), polyaniline, and polyacetylene.
  • polyacetylene, polydiacetylene, poly (thiophenevinylene), polyfluorene and poly (3,4-ethylenedioxythiophene) PEDOT: polystyrenesulfonate (PSS) It may include one or more selected from the group consisting of.
  • the conductive filler (41b, 41b ') is a conductive polymer compound
  • the conductive filler (41b, 41b') is 25 to 400 parts by weight, more preferably 90 to 400 with respect to 100 parts by weight of the fiber forming component of the fiber portion It may be provided in parts by weight. If the conductive filler is provided in less than 25 parts by weight of the fiber-forming component, it may be difficult to express a desired level of electromagnetic shielding performance or it may be difficult to electrically connect all of the cracked parts when a crack occurs in the metal shell part. It can be difficult to maintain performance. In addition, if the conductive filler is provided in excess of 400 parts by weight, the mechanical strength of the composite fiber is lowered, there is a fear that the spinning properties during the manufacture of the fiber portion may be significantly reduced.
  • the conductive portions 12, 22, 32, and 42 function to lower the resistance of the conductive fibrous web to express electromagnetic shielding performance.
  • the conductive parts 12, 22, 32, and 42 may be used without limitation in the case of a conventional electrically conductive material.
  • the conductive parts 12, 22, 32, and 42 may be at least one metal material selected from the group consisting of aluminum, nickel, copper, silver, gold, chromium, platinum, titanium alloys, and stainless steel.
  • the metallic conductive parts 12, 22, 32, and 42 may be formed of three layers of nickel layer / copper layer / nickel layer. In this case, the copper layer may have a low electrical resistance.
  • the nickel layer formed on the copper layer can prevent the degradation of the electromagnetic shielding performance by preventing oxidation of the copper layer.
  • the conductive parts 12, 22, 32, and 42 may be conductive polymer compounds.
  • Description of the conductive polymer compound is the same as the description of the conductive polymer compound that can be provided in the above-described fiber portion and will not be described in detail below.
  • the conductive portion 12, 22, 32, 42 may have a thickness of 0.1 ⁇ 2 ⁇ m, if the thickness of the conductive portion exceeds 2 ⁇ m cracks, peeling when the shape, such as bending of the conductive composite fiber changes It is easy to occur, if less than 0.1 ⁇ m it may be difficult to express the electromagnetic shielding performance to the desired level, there is a fear that the shielding performance is further reduced due to the increased occurrence of peeling during expansion.
  • the conductive composite fiber 50 may be implemented by the first conductive portion 52a and the second conductive portion 52b sequentially covering the outside of the fiber portion 51.
  • the first conductive portion 52a may cause an increase in resistance when cracks occur due to stretching / wrinkling of the electromagnetic shielding material.
  • the first conductive portion 52a may have a first conductivity. After the formation of the portion 52a, the fibers are elongated in the longitudinal direction to cause cracks in the first conductive portion 52a, and the second conductive portion 52b is formed on the first conductive portion 52a while maintaining the stretched state.
  • the second conductive portion 52b can penetrate into the gap between the first conductive portions 52a 1 and 52a 2 where the crack has been formed.
  • the second conductive portion 52b intentionally generates a crack in the first conductive portion 52a and offsets the resistance increased due to the breakage of the first conductive portion 52a 1 , 52a 2 due to the crack. ) Can be reduced or prevented from the manufacturing stage due to the additional cracks in the conductive part during the stretching process during the use.
  • the crack intentionally generated in the first conductive portion 52a increases the flexibility of the conductive composite fiber 50, so that the electromagnetic shielding material may have greater flexibility.
  • the first conductive portion 52a may be a metal material in which cracks may easily occur
  • the second conductive portion 52b may be a conductive polymer compound.
  • the first conductive portion 52a may have a thickness of 0.1 to 2 ⁇ m, and more preferably, the first conductive portion 52a may have a thickness of 0.1 to 1.0 ⁇ m.
  • the second conductive portion 52b may have a thickness of 0.05 ⁇ m to 1 ⁇ m.
  • the thickness of the first conductive portion exceeds 2 ⁇ m, additional cracks and peelings are likely to occur when the shape of the conductive composite fiber is changed, in addition to the cracks intentionally generated, and if less than 0.1 ⁇ m, intentionally generated cracks. As a result, the peeling may occur remarkably, and thus, even after the second conductive portion is formed, the desired level of initial electromagnetic shielding performance may not be expressed, and there is a concern that the variation of the electromagnetic shielding performance may increase due to elongation generated during use.
  • the thickness of the second conductive portion may be 0.05 to 1 ⁇ m. If the thickness of the second conductive portion is less than 0.0.5 ⁇ m, it may be difficult to prevent an increase in resistance due to the first conductive portion in which the crack occurs, and the gap of the crack may be difficult. It may be difficult for the second conductive portion to fill sufficiently. In addition, if the thickness of the second conductive portion is greater than 1 ⁇ m, although the first conductive portion is provided due to the rather high electrical resistance of the conductive polymer compound, the electrical resistance of the conductive fibrous web may increase rapidly, thereby achieving the desired level. It may be difficult to express electromagnetic shielding performance. In addition, the flexible extension property may decrease due to the increase in the thickness of the second conductive portion, which may cause tearing of the conductive fiber web due to external force generated during use.
  • the conductive composite fibers (10,20,30,40,40 ', 50) may have a diameter of 0.2 ⁇ 10 ⁇ m, when the diameter is less than 0.2 ⁇ m deterioration in handleability, may not be easy to manufacture, diameter When it exceeds 10 micrometers, there exists a possibility of elasticity fall and electromagnetic wave shielding performance fall.
  • the heat dissipation part 120 may be provided in some or all of the plurality of pores provided in the conductive fiber web 100 formed of the conductive composite fibers 10, 20, 30, 40, 40 ′, and 50.
  • the heat dissipation unit 120 performs a function of transmitting and radiating heat generated from an element surrounded by the electromagnetic shielding material 1000 to the outside.
  • the heat dissipation unit 120 may be used without limitation in the case of a known material expressing heat dissipation performance.
  • the heat dissipation unit may include a phase change material and a thermally conductive filler.
  • the phase change compound may release heat to the outside by using a change in a property of which a phase changes from a solid phase or a semi-solid phase to a semi-solid and / or liquid phase by heat generated in the device.
  • a change in a property of which a phase changes from a solid phase or a semi-solid phase to a semi-solid and / or liquid phase by heat generated in the device is called latent heat.
  • latent heat sensible heat
  • phase change compound may be a known phase change compound
  • the present invention is not particularly limited thereto.
  • the group consisting of linear aliphatic hydrocarbons, hydrated inorganic salts, polyhydric alcohols, higher fatty acids, alcohol fatty acid esters, and polyethers may be used. It may include one or more selected from.
  • the linear aliphatic hydrocarbon may be n-paraffinic saturated hydrocarbon, or may be saturated hydrocarbon having 10 to 36 carbon atoms.
  • the hydrated inorganic salt may include one or more hydrates of inorganic salts consisting of calcium chloride, potassium chloride, sodium sulfate, sodium acetate, sodium phosphate, sodium carbonate, sodium thiosulfate, potassium hydroxide, barium hydroxide and lithium nitrate, zinc nitrate and the like.
  • the polyhydric alcohol may be a C 2-20 glycol (dihydric alcohol) or C 2-20 glycerol (trihydric alcohol).
  • the higher fatty acid is a compound having 5 or more carbon atoms, preferably 10 or more carboxyl groups, and may be stearic acid, palmitic acid, lactic acid, or the like.
  • the alcohol fatty acid ester may be an esterified product of the above-mentioned polyhydric alcohol and fatty acid esterification, and may be, for example, wax, beeswax and the like.
  • the polyether may be a polyhydric alcohol, for example, polyethylene glycol polymerized with ethylene glycol, wherein the molecular weight of the polyethylene glycol may be designed differently according to the melting point of the desired phase change compound, and thus the present invention is not particularly limited. But preferably the weight average molecular weight may be 500 to 5000.
  • phase change compound included in one embodiment of the present invention may have a melting point of 10 to 60 °C but is not limited thereto, and may be designed differently depending on the desired degree of heat dissipation, the temperature of the electromagnetic wave source.
  • the heat dissipation unit 120 may include a thermally conductive filler.
  • the thermally conductive filler may include at least one of a metal filler, a ceramic filler, and a carbon-based filler, but it may be desirable to simultaneously have thermal conductivity and electrical conductivity in order to simultaneously express more improved electromagnetic shielding performance.
  • the metal filler is Al, Ag, Cu, NI, Fe, Pt, Au, Cr, Ti alloy, In-Bi-Sn alloy, Sn-In-Zn alloy, Sn-In-Ag alloy, Sn-Ag-Bi alloy At least one known metal filler such as Sn-Bi-Cu-Ag alloy, Sn-Ag-Cu-Sb alloy, Sn-Ag-Cu alloy, Sn-Ag alloy, and Sn-Ag-Cu-Zn alloy It may include, the ceramic filler may include one or more of known ceramic fillers, such as AlN, Al 2 O 3 , BN, MgO, SiC and BeO, the carbon-based filler is a single-wall carbon nanotube, Carbon nanotubes such as double-walled carbon nanotubes, multi-walled carbon nanotubes, graphene, graphene oxide, graphite, carbon black and the like may include one or more kinds of fillers.
  • the pores exposed on one surface of the electromagnetic shielding material, or pores located in close proximity thereto may include an insulating heat dissipation filler.
  • the insulating heat dissipation filler can be used without limitation in the case of known insulating heat dissipation fillers, for example, silicon carbide, magnesium oxide, titanium dioxide, aluminum nitride, silicon nitride, boron nitride, aluminum oxide, silica, zinc oxide, barium titanate, strontium titanate At least one insulating heat-radiating filler selected from the group consisting of beryllium oxide, manganese oxide, zirconia oxide and boron oxide may be used.
  • the particle diameter of the thermally conductive filler may be 10nm ⁇ 5 ⁇ m, but is not limited to this may be appropriately selected in consideration of the diameter of the pores of the conductive fibrous web.
  • the shape of the thermally conductive filler can be used without limitation in the case of known shapes such as plate, sphere, and amorphous shape.
  • the phase change compound and the thermally conductive filler as the heat dissipation unit 120 may be provided in the pores of the conductive fiber web in a semi-solid state.
  • a semi-solid property is used in the pores of the conductive fibrous web, so that the semi-solid material itself is used, or the heat dissipating part further includes a semi-solid polymer compound, wherein the polymer compound further comprises The phase change compound may be provided in the pores in a mixed state.
  • the heat dissipation part may further include a polymer compound having a semi-solid property, and may be provided in the pores of the conductive fiber web in a form in which the thermally conductive filler is dispersed in the polymer compound.
  • thermal grease such as silicone resin
  • the thermal grease type matrix and a known material may be employed, and thus the detailed description thereof will be omitted.
  • the heat dissipation unit 120 may be provided with 11 to 900 parts by weight based on 100 parts by weight of the conductive fiber web, thereby expressing a desired level of heat dissipation performance and may not inhibit the stretching property of the conductive fiber web. .
  • the heat dissipation part 120 may be located inside the conductive fibrous web 100, and the heat dissipation part may not be located on a part or all of the outer surface of the conductive fibrous web.
  • the heat dissipation unit may cause a decrease in electromagnetic shielding performance depending on the material.
  • the insulating heat dissipation filler provided as a heat dissipation component may increase the resistance of the conductive fiber web.
  • a heat dissipation part may be formed together with a polymer compound having adhesion or adhesive properties, and the polymer compound may cause an increase in resistance of the conductive fiber web.
  • the heat dissipation unit 120 may be provided to be located inside the conductive fiber web so as not to be exposed to the outside of the electromagnetic shielding material, and the outer surface of the heat dissipating unit 120 is not provided to expose the heat dissipation part to all or part of the outer surface of the conductive fiber web.
  • Electromagnetic shielding material comprises the steps of (1) preparing a conductive fibrous web; And (2) providing a heat dissipation part to at least some pores of the manufactured conductive fibrous web.
  • the present invention is not limited thereto.
  • step (1) the step of manufacturing the conductive fibrous web 100 is performed.
  • the conductive fibrous web 100 implements a fibrous web having a three-dimensional network structure with the manufactured conductive composite fiber 10 or (a) spinning a spinning solution containing a fiber forming component to produce a fibrous web formed of fibrous parts Step and (b) to form a conductive portion to cover the outside of the fiber portion can be produced through the step of producing a conductive fiber web.
  • the conductive composite fiber is a metal paste, conductive polymer compound that can spin the spinning solution containing the fiber-forming component through the inner nozzle of the double-spinning nozzle, and form the conductive portion through the outer nozzle
  • the metal paste may be calcined or the conductive polymer compound may be solidified.
  • the conductive composite fiber may be prepared by forming a conductive portion on the outer surface of the fiber manufactured through the spinning solution containing the fiber forming component.
  • the spinning solution may further include a solvent appropriately selected according to the spinning method, the type of the fiber-forming component provided, or the like, or may be a molten solution in which the fiber-forming component is melted.
  • the method of spinning the spinning solution may be appropriately selected in consideration of the diameter of the desired conductive composite fiber and the type of the fiber forming component.
  • the spinning solution may be electrospinning or a method in which the spinning solution is extruded through the spinneret using pressure. have.
  • dry spinning or wet spinning can be appropriately selected in consideration of the type of the fiber forming component, the type of the solvent provided in the spinning solution, and the present invention is not particularly limited thereto.
  • spinning solution includes a fiber forming component, it is understood that a spinning solution having a conductive filler may be used according to the purpose.
  • the method of forming the conductive portion on the outer surface of the manufactured fiber may be performed by a known coating method, a plating method, or the like.
  • the conductive part is a metal
  • the fiber is dipped in a metal paste and then dried and / or sintered. The process may go through.
  • the plating may be performed through electroless plating using a known plating method.
  • the conductive composite fiber produced may be a method of manufacturing a known fibrous web, for example, a dry nonwoven fabric such as a chemical bonding nonwoven fabric, a thermal bonding nonwoven fabric, an airlay nonwoven fabric, a wet nonwoven fabric, a spanless nonwoven fabric, a needle punching nonwoven fabric, or a meltblown fabric. Can be made into a conductive fibrous web.
  • a dry nonwoven fabric such as a chemical bonding nonwoven fabric, a thermal bonding nonwoven fabric, an airlay nonwoven fabric, a wet nonwoven fabric, a spanless nonwoven fabric, a needle punching nonwoven fabric, or a meltblown fabric.
  • the conductive fibrous web is another manufacturing method, comprising the steps of (a) preparing a fibrous web formed of a fiber portion spinning the spinning solution containing a fiber-forming component and (b) forming a conductive portion to cover the outside of the fiber portion It can be prepared including the step of producing a conductive fibrous web.
  • the fibrous web may be manufactured by a known spinning method.
  • the fibrous web may be manufactured through a calendering process on a fibrous mat collected and accumulated in a collector by spinning a fiber forming component.
  • it can be produced by performing a method for producing a known fibrous web for the fibers produced separately.
  • the fiber web prepared in step (a) is a step (b), to perform the step of forming a conductive portion to cover the fiber portion of the fiber web.
  • step (b) is a step of forming a conductive part on the outer surface of the fiber part of the manufactured fibrous web.
  • the conductive part may be formed by a known method.
  • the conductive part may be immersed, deposited, plated, or conductive paste. There may be a coating method through.
  • step (2) the step of providing a heat dissipation unit in at least a portion of the pores of the prepared conductive fibrous web.
  • the heat dissipation unit may be provided in the pores provided in the conductive fibrous web by appropriately changing a known method for filling a material in the pores of the porous substrate, for example, coating, dipping, screen printing, floating of a heat dissipating solution including a heat dissipation unit.
  • a known method for filling a material in the pores of the porous substrate for example, coating, dipping, screen printing, floating of a heat dissipating solution including a heat dissipation unit.
  • Known coating methods such as printing or comma coating can be employed, and the enumerated methods can be carried out by employing the conditions according to the known methods for each, so that the detailed description thereof will be omitted.
  • At least one surface of the conductive fibrous web 100 formed by including the above-described conductive composite fibers 10, 20, 30, 30 ', 40 is further provided with a conductive adhesive layer 200 as shown in FIG. Can be.
  • the conductive adhesive layer 200 may be a known conductive adhesive layer.
  • the conductive filler 220 may be dispersed in the adhesive matrix 210.
  • the adhesive matrix may be formed of at least one resin selected from acrylic resin and urethane resin, and the conductive filler may be selected from the group consisting of nickel, nickel-graphite, carbon black, graphite, alumina, copper, and silver. It may be more than one species.
  • the conductive adhesive layer 200 may be provided with the conductive filler 220 at 5 to 95% by weight based on the total weight of the conductive adhesive layer 200.
  • the conductive adhesive layer 200 may have a thickness of 10 to 30 ⁇ m. When the thickness of the conductive adhesive layer 200 is excessive, as the vertical resistance of the electromagnetic shielding material 1000 is increased, the electromagnetic shielding performance may not be expressed at a desired level.
  • the conductive adhesive layer 200 may be formed by treating and impregnating a conductive adhesive layer forming composition on one surface of the conductive fiber web 100 to be formed, and thus, a portion of the conductive adhesive layer 200 is conductive. It is formed on the fibrous web 100, the remaining portion may be provided to be filled in the pores of the conductive fibrous web 100 to be located inside the conductive fibrous web (100).
  • the electromagnetic shielding material having the above-described conductive fiber web 100 is implemented as an electromagnetic shielding circuit module 2000 as shown in FIG. 6, and specifically, at least on the circuit board 1200 on which the elements 1310 and 1320 are mounted.
  • An electromagnetic shielding material 1100 may be provided on the circuit board 1200 to cover upper and side portions of the devices 1310 and 1320.
  • the circuit board 1200 may be a known circuit board provided in an electronic device.
  • the circuit board 1200 may be a PCB or an FPCB. Since the size and thickness of the circuit board 1200 can be changed according to the internal design of the electronic device to be implemented, the present invention is not particularly limited thereto.
  • the devices 1310 and 1320 may be well-known devices mounted on a circuit board in an electronic device such as a driving chip, and may be devices that generate electromagnetic waves and / or heat or are sensitive to electromagnetic waves and easily malfunction.
  • Electromagnetic shielding material 1100 according to an embodiment of the present invention, even if the separation distance between the adjacent elements (1310, 1320) or the step due to the thickness of the elements (1310, 1320), as shown in FIG. As it can be adhered closely, it is advantageous to express more improved electromagnetic shielding performance.
  • a spinning solution was prepared by dissolving 12 g of polyvinylidene fluoride in a weight ratio of dimethylacetamide and acetone at 70:30 using a magnetic bar at 85 ° C. for 6 hours at 80 ° C.
  • the spinning solution was introduced into a solution tank of an electrospinning apparatus and discharged at a rate of 20 ⁇ l / min / hole.
  • the temperature of the radiation section is 30 °C
  • the humidity is maintained at 50%
  • the distance between the collector and the spinneret tip 20cm, using a high voltage generator on the collector the voltage of 40kV to the spin nozzle pack (Spin Nozzle Pack)
  • air pressure of 0.03 MPa per spin pack nozzle was applied to prepare a PVDF fiber web having an average diameter of 400 nm.
  • a calendering process was performed by applying heat and pressure at a temperature of 140 ° C. and 1 kgf / cm 2 to dry the solvent and moisture remaining in the fibrous web.
  • a nickel metal shell portion was formed on the manufactured fibrous web.
  • nickel electroless plating was performed on the fibrous web.
  • the fibrous web was immersed in a degreasing solution at 60 ° C. for 30 seconds and then washed with pure water, and then immersed in an etching solution (5 M NaOH, pure water) at 60 ° C. for 1 minute. It was washed with pure water. Thereafter, the fibrous web was immersed in a catalyst solution (Pd 0.9%, HCl 20%, pure water) at room temperature for 3 minutes and then washed with pure water. Subsequently, the fibrous web was immersed in 50 ° C.
  • a process of forming a heat dissipation part was performed on the manufactured conductive fibrous web.
  • a composition containing an acrylic adhesive component 8 parts by weight of an alumina heat dissipation filler having an average particle diameter of 1.6 ⁇ m with respect to 100 parts by weight of a heat dissipation part forming composition was prepared.
  • the prepared composition was coated on a release PET film using a bar coater, and then the conductive fibrous web was coated on the coated surface, and the mixed solution was coated thereon, then laminated with a release PET film, followed by a calendering process.
  • a heat curing process was performed at 120 ° C. for 24 hours to prepare an electromagnetic shielding material as shown in Table 1 below.
  • a spinning solution was prepared by dissolving 12 g of polyvinylidene fluoride in a weight ratio of dimethylacetamide and acetone at 70:30 using 88 ° C. at 6 ° C. for 6 hours using a magnetic bar. Spherical silver particles having an average particle diameter of 1.3 ⁇ m were added to the spinning solution by mixing polyvinylidene fluoride and silver particles in a volume ratio of 1: 0.2 to account for 16.7% of the total volume of the final fiber, followed by ultrasonic disperser. Dispersed for 12 hours. The spinning solution was introduced into a solution tank of an electrospinning apparatus, the solution was stirred through an impeller, and discharged at a rate of 20 ⁇ l / min / hole.
  • the temperature of the spinning section is 30 °C
  • the humidity is maintained at 50%
  • the distance between the collector and the spinneret tip 20cm using a high voltage generator to apply a voltage of 40kV to the spin nozzle pack (Spin Nozzle Pack) and
  • a calendering process was performed by applying heat and pressure at a temperature of 140 ° C. and 1 kgf / cm 2 to dry the solvent and moisture remaining in the fibrous web.
  • a nickel metal shell portion was formed on the manufactured fibrous web.
  • nickel electroless plating was performed on the fibrous web.
  • the fibrous web was immersed in a degreasing solution at 60 ° C. for 30 seconds and then washed with pure water, and then immersed in an etching solution (5 M NaOH, pure water) at 60 ° C. for 1 minute. It was washed with pure water. Thereafter, the fibrous web was immersed in a catalyst solution (Pd 0.9%, HCl 20%, pure water) at room temperature for 3 minutes and then washed with pure water.
  • a catalyst solution Pd 0.9%, HCl 20%, pure water
  • the fibrous web After immersing the fibrous web in 50 ° C sulfuric acid solution (H 2 SO 4 85ml / L, pure water) for 30 seconds for catalytic activity and then rinsing with pure water, the fibrous web was immersed in 60 ° C nickel ion solution for 1 minute and then purified.
  • the metal shell portion of nickel having a thickness of 0.12 mu m was coated on the fiber portion of the fibrous web to prepare a conductive fibrous web having a thickness of 10 mu m, basis weight of 12 g / m 2, and porosity of 40%.
  • an electromagnetic shielding material as shown in Table 1 was prepared by forming a heat dissipation part as in Example 1 on the manufactured conductive fiber web.
  • Example 2 Prepared in the same manner as in Example 2, the content of the conductive filler, the particle diameter was changed as shown in Table 1 or Table 2 to prepare a conductive fibrous web as shown in Table 1 or Table 2.
  • a spinning solution was prepared by dissolving 12 g of polyvinylidene fluoride in a weight ratio of dimethylacetamide and acetone at 70:30 using 88 ° C. at 6 ° C. for 6 hours using a magnetic bar.
  • the spinning solution was introduced into a solution tank of an electrospinning apparatus and discharged at a rate of 20 ⁇ l / min / hole.
  • the temperature of the radiation section is 30 °C
  • the humidity is maintained at 50%
  • the distance between the collector and the spinneret tip 20cm, using a high voltage generator on the collector the voltage of 40kV to the spin nozzle pack (Spin Nozzle Pack)
  • air pressure of 0.01 MPa per spin pack nozzle was applied to produce PVDF fiber webs having an average diameter of 200 nm.
  • heat and pressure were applied at a temperature of 140 ° C. and 1 kgf / cm 2 to dry the solvent and moisture remaining in the fibrous web.
  • a first conductive portion that is nickel was formed on the manufactured fibrous web.
  • nickel electroless plating was performed on the fibrous web.
  • the fibrous web was immersed in a degreasing solution at 60 ° C. for 30 seconds and then washed with pure water, and then immersed in an etching solution (5 M NaOH, pure water) at 60 ° C. for 1 minute. It was washed with pure water.
  • the fibrous web was immersed in a catalyst solution (Pd 0.9%, HCl 20%, pure water) at room temperature for 3 minutes and then washed with pure water.
  • the fibrous web After immersing the fibrous web in 50 ° C sulfuric acid solution (H 2 SO 4 85ml / L, pure water) for 30 seconds for catalytic activity and then rinsing with pure water, the fibrous web was immersed in 60 ° C nickel ion solution for 1 minute The first conductive portion of nickel having a thickness of 0.12 mu m was coated on the fiber portion of the fibrous web.
  • 50 ° C sulfuric acid solution H 2 SO 4 85ml / L, pure water
  • a second conductive part forming solution was prepared to form the second conductive part. Specifically, in order to improve volatilization in a dispersion in which 1 to 1.5 parts by weight of PEDOT is mixed with respect to 100 parts by weight of ultrapure water, 100 parts by weight of the dispersion is used. 50 parts by weight of IPA was mixed and stirred at room temperature for 6 hours. The second conductive part forming solution prepared was spray coated on the fibrous web fixed to the mold and dried in a vacuum oven at 60 ° C.
  • the second conductive part having a thickness of 0.06 ⁇ m, through which the thickness was 20 ⁇ m, and the basis weight was 11.5. g / m 2, porosity of 30% to prepare a conductive fibrous web as shown in Table 2 below. As a result of photographing the SEM image of the manufactured fibrous web, it was confirmed that the second conductive part was filled in the spaced gap between the cracks generated in the first conductive part.
  • the conductive fiber web was used as an electromagnetic shielding material itself.
  • the resistance of the conductive fiber web surface was measured by a resistance meter (HIOKI 3540 m ⁇ HITESTER, HIOKI). Based on the measured value of Comparative Example 1 measured as 100, the measured resistance value according to the example was expressed as a relative percentage.
  • the specimen was stretched 1.2 times in the transverse direction using a jig, and then three sets were repeated with one set of 1.2 times in the longitudinal direction.
  • Example 1 Example 2 Example 3 Example 4 Example 5 Example 6
  • Example 7 Conductive Filler Particle size ( ⁇ m) Not included 1.3 1.45 1.6 0.25 0.35 0.75 Content (% by volume) 16.7 16.7 16.7 16.7 16.7 2nd part diameter (nm) 400 300 300 300 300 300 300 300 300 Second part diameter: conductive filler diameter - 1: 4.33 1: 4.83 1: 5.33 1: 0.83 1: 1.17 1: 2.5
  • With heat sink include include include include include include include include include include include include include include include include include include include include include include include include include include include Initial electromagnetic shielding performance (%) 110.6 90.5 88.6 87.6 100.1 95.1 93.3 Electromagnetic shielding performance change rate (%) 28.9 11.7 12.2 25.8 26.6 18.5 14.4 Shape holding power ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇
  • Example 8 Example 9 Example 10 Example 11 Example 12 Example 13 Comparative Example 1 Conductive Filler Particle size ( ⁇ m) One 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 Not included Not included Content (% by volume) 16.7 8.5 10.5 49 52 2nd part diameter (nm) 300 300 300 300 300 300 300 300 200 400 Second part diameter: conductive filler diameter 1: 3.33 1: 4.33 1: 4.33 1: 4.33 1: 4.33 - - With heat sink include include include include include include include include include include include include include include include include include include include include include include include include include Not included Initial electromagnetic shielding performance (%) 91.4 99.6 94.3 80.2 79.6 103.0 100 Electromagnetic shielding performance change rate (%) 12.0 15.4 1
  • Example 12 the particle size of the conductive filler is out of the preferred range of the present invention, but in Example 12, the content is out of the preferred range of the present invention, tearing occurs due to elongation due to a decrease in mechanical strength, Accordingly, it can be seen that the change rate was also large.
  • Example 2 Prepared in the same manner as in Example 1, but changed the fiber-forming component and solvent of the spinning solution. Specifically, 16 g of the fiber-forming component in which the weight ratio of polyvinylidene fluoride and polyurethane were mixed at 7: 3 was mixed with 84 g of the solvent in which the weight ratio of dimethylacetamide and acetone was mixed at 7: 3. It was dissolved by using to prepare a spinning solution, through which the thickness is 20 ⁇ m, basis weight is 9.8g / m2, porosity 50%, the average pore diameter of 0.7 ⁇ m was prepared a conductive fibrous web, and then to form a heat dissipation A conductive shield as shown in Table 3 was prepared.
  • Example 14 Prepared in the same manner as in Example 14, but changed the content ratio of PVDF and polyurethane as a fiber forming component as shown in Table 3 to prepare a conductive fiber web as shown in Table 3.
  • Example 1 In Example 1 and Examples 14 to 20, the following physical properties were evaluated and shown in Table 2 below.
  • the specimen was stretched 1.4 times in the transverse direction using a jig, and then three sets were repeated with one set of 1.4 times in the longitudinal direction again in a state where the stress was removed.
  • the area (C) of the specimen was calculated after three sets of stretching and recovery in the horizontal and vertical directions.
  • the area variation rate was calculated according to Equation 2 based on the area (D) of the initial specimen before the stretching process.
  • damage occurred such as tearing after 3 sets of expansion
  • Example 1 Example 14 Example 15 Example 16 Example 17 Example 18 Example 19 Example 20 Fiber Forming Ingredients PVDF: Polyurethane Weight Ratio 1: 0.0 1: 0.43 1: 1.45 1: 1.6 1: 1.9 1.2.2 1: 0.14 1: 0.22 Electromagnetic shielding performance change rate (%) 29.6 6.3 8.2 11.3 12.7 23.6 25.9 10.1 Shape holding power Damage ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ Area variation rate (%) Unmeasured 3.0 6.2 6.6 7.5 Unmeasured Unmeasured 2.0
  • Example 1 containing no polyurethane as the fiber forming component of the fiber part, it was confirmed that the tearing occurred as the elongation ratio was increased than in Experimental Example 1, and it was confirmed that the rate of variation of the electromagnetic shielding performance was also significantly increased.
  • Example 18 the tearing occurred even when the polyurethane was increased was expected as a result of the damage to the fiber portion depending on the various solutions applied during the plating process.
  • a mixed liquid was prepared using a 7 parts by weight mixed mixer of nickel particles having an average particle diameter of 3 ⁇ m based on 100 parts by weight of a conductive adhesive composition including an acrylic adhesive forming component.
  • the prepared mixed solution is coated on a release PET film using a bar coater, and then the conductive fibrous web prepared according to Example 1 is laminated on the coated surface, and then the mixed solution is coated thereon, then laminated with a release PET film, followed by a calendering process.
  • the laminated conductive shielding material was subjected to a thermal curing process at 120 ° C. for 24 hours to cure the adhesive adhesive layer, thereby manufacturing an electromagnetic shielding material having conductive adhesive layers formed on both surfaces of the conductive fiber web.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

L'invention concerne un matériau flexible de blindage contre les ondes électromagnétiques. Un matériau de blindage contre les ondes électromagnétiques, selon un mode de réalisation de la présente invention, comprend : une bande de fibres conductrices comprenant une pluralité de pores ; et une partie de dissipation de chaleur disposée dans au moins certains des pores. Du fait de ces caractéristiques, étant donné que le matériau de blindage contre les ondes électromagnétiques selon la présente invention présente d'excellentes propriétés de flexibilité, d'élasticité et de plissage/récupération, il est possible d'en modifier librement la forme selon les besoins et de fixer le matériau de blindage contre les ondes électromagnétiques pour qu'il adhère complètement à une surface même si la surface sur laquelle doit être disposé le matériau a une forme courbée telle qu'une surface irrégulière ou étagée, et il est ainsi possible d'obtenir une excellente performance de blindage contre les ondes électromagnétiques. En outre, l'invention permet d'empêcher une dégradation de la performance de blindage contre les ondes électromagnétiques même avec diverses modifications de forme. En outre, étant donné que la performance de dissipation de chaleur est excellente, la chaleur générée dans une source de génération d'ondes électromagnétiques peut faire l'objet d'une conduction et d'un rayonnement rapides. De plus, même lorsque des parties sont montées avec une densité élevée dans une zone étroite, le matériau de blindage contre les ondes électromagnétiques peut être disposé de façon à adhérer complètement aux parties montées tout en surmontant les intervalles d'espacement serrés et les étages entre les parties, ce qui permet d'adopter facilement le matériau flexible de blindage contre les ondes électromagnétiques dans un dispositif électronique compact ou flexible.
PCT/KR2017/014553 2016-12-13 2017-12-12 Matériau flexible de blindage contre les ondes électromagnétiques, module de circuit de type à blindage contre les ondes électromagnétiques le comprenant et dispositif électronique équipé de ce dernier WO2018110942A1 (fr)

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CN201780077039.5A CN110089208B (zh) 2016-12-13 2017-12-12 柔性电磁波屏蔽材料、电磁波屏蔽型电路模块及电子设备
US16/468,894 US11528833B2 (en) 2016-12-13 2017-12-12 Flexible electromagnetic wave shielding material, electromagnetic wave shielding-type circuit module comprising same and electronic device furnished with same

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KR10-2016-0169490 2016-12-13
KR20160169490 2016-12-13
KR10-2017-0170429 2017-12-12
KR1020170170429A KR102045018B1 (ko) 2016-12-13 2017-12-12 플렉서블 전자파차폐재, 이를 포함하는 전자파차폐형 회로모듈 및 이를 구비하는 전자기기

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KR20150007827A (ko) * 2013-07-12 2015-01-21 엘지전자 주식회사 높은 방열 성능을 갖는 방열 소자의 방열 구조
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