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KR-102964249-B1 - Electromagnetic wave shielding skin material manufacturing method and electromagnetic wave shielding skin material manufactured thereby

KR102964249B1KR 102964249 B1KR102964249 B1KR 102964249B1KR-102964249-B1

Abstract

The present invention relates to a method for manufacturing an electromagnetic shielding skin material that has excellent strength, rigidity, and corrosion resistance, as well as being lightweight and capable of easily shielding electromagnetic waves, thereby allowing for a gradual increase in usage, and to an electromagnetic shielding skin material manufactured thereby. The method is characterized by comprising, broadly: a) a lamination step in which NCF (Non Crimp Fabric) is laminated in the cavity of a lower mold; b) a joining step in which an upper mold having an injection port is joined with the lower mold; c) an injection step in which an epoxy-based mixture mixed with GNP (Graphene Nano Plates) is injected into the cavity of the lower mold through the injection port of the upper mold; d) a heat curing step in which the epoxy-based mixture mixed with GNP injected into the cavity of the lower mold is heat-cured; and e) a demolding step in which the upper mold is demolded from the cavity of the lower mold.

Inventors

  • 이민상
  • 김홍건
  • 곽이구

Assignees

  • 전주대학교산학협력단

Dates

Publication Date
20260512
Application Date
20231114

Claims (14)

  1. a) a placement step of placing NCF (Non Crimp Fabric) in the cavity of the lower die; b) a joining step of joining an upper mold having an injection port formed therein to the lower mold; and c) an injection step of injecting an epoxy-based mixture mixed with GNP (Graphene Nano Plates) into the cavity of the lower mold through the injection port of the upper mold; d) a heat curing step for heat curing an epoxy-based mixture mixed with GNP injected into the cavity of the lower mold; e) a demolding step of demolding the upper mold from the lower mold; comprising, and 3% by weight of GNP is mixed with respect to the total weight of the above mixture, A method for manufacturing an electromagnetic shielding skin material characterized by mixing 2% by weight of a diluent with respect to the total weight of the above mixture.
  2. a) a placement step of placing NCF (Non Crimp Fabric) in the cavity of the lower die; b) a joining step of joining an upper mold having an injection port formed therein to the lower mold; and c) an injection step of injecting an epoxy-based mixture mixed with GNP (Graphene Nano Plates) into the cavity of the lower mold through the injection port of the upper mold; d) a heat curing step for heat curing an epoxy-based mixture mixed with GNP injected into the cavity of the lower mold; e) a demolding step of demolding the upper mold from the lower mold; comprising, and A method for manufacturing an electromagnetic shielding skin material, characterized in that the above mixture comprises 95% by weight of a mixed composition formed by mixing a low-viscosity epoxy resin and a curing agent in a weight ratio of 3:1, and 2% by weight of a diluent consisting of 3% by weight of GNP and BGE or MEK.
  3. a) a placement step of placing NCF (Non Crimp Fabric) in the cavity of the lower die; b) a joining step of joining an upper mold having an injection port formed therein to the lower mold; and c) an injection step of injecting an epoxy-based mixture mixed with GNP (Graphene Nano Plates) into the cavity of the lower mold through the injection port of the upper mold; d) a heat curing step for heat curing an epoxy-based mixture mixed with GNP injected into the cavity of the lower mold; e) a demolding step of demolding the upper mold from the lower mold; comprising, and In step c) above, the epoxy-based mixture mixed with GNP stored at a certain height inside the storage unit passes through the guide line provided between the storage unit and the injection port of the upper mold, and is injected into the cavity of the lower mold through the injection port of the upper mold by means of a pump provided on the guide line that pumps the epoxy-based mixture mixed with GNP into the guide line. In step c) above, the storage unit is a storage container in which an epoxy-based mixture mixed with GNP is stored internally; An opening/closing plate detachably mounted on the upper part of the storage container to open and close the upper part of the storage container; A protruding piece formed at equal intervals on the edge of the opening/closing plate, having a guide slit formed on the inner side, and having one side of the guide slit open; A rotating tube provided at equal intervals on the upper part of the storage container with its lower part axially coupled to the upper part of the storage container, and the upper part of which rotates in the vertical direction of the storage container; It is configured to include a fixing member, the lower part of which is screw-coupled to the upper inner side of the above-mentioned rotating tube, and which rotates and moves in the upward direction of the storage container together with the upper part of the above-mentioned rotating tube so that the upper part is received in the guide slit of the above-mentioned protruding piece. When the fixing member is rotated clockwise while the upper part of the fixing member is received in the guide slit of the protruding piece, the head member of the upper part of the fixing member comes into close contact with the upper part of the protruding piece, and A method for manufacturing an electromagnetic shielding skin material, characterized in that when the upper part of the fixed member is received in the guide slit of the protruding piece and the fixed member is rotated counterclockwise, the close contact state of the head member attached to the upper part of the protruding piece is released.
  4. In any one of paragraphs 1 to 3, A method for manufacturing an electromagnetic shielding skin material, characterized in that step a) above is a step of placing the NCF in a cavity formed inside the square frame while the square frame is seated on the upper edge of the lower mold.
  5. In Paragraph 4, In step a) above, a packing member extending along the upper edge of the lower mold is provided on the upper edge of the lower mold, and A method for manufacturing an electromagnetic shielding skin material, characterized in that, in step b) above, a packing member extending along the lower edge of the lower mold is provided on the lower edge of the upper mold.
  6. In Paragraph 4, In step a) above, grooves are formed on one side and the other side of the upper portion of the lower mold located inside the square frame, respectively, and A method for manufacturing an electromagnetic shielding skin material characterized by forming discharge ports communicating with the groove on one side and the other side of the lower mold, respectively.
  7. In Paragraph 6, A method for manufacturing an electromagnetic shielding skin material, characterized in that, in step a) above, a discharge line connected to a vacuum pump is connected to the discharge ports formed on one side and the other side of the lower mold, respectively.
  8. In any one of paragraphs 1 to 3, A method for manufacturing an electromagnetic shielding skin material characterized by mixing GNP, which is in an ultrasonically dispersed state for 24 hours, into the epoxy-based mixture in step c) above.
  9. In any one of paragraphs 1 to 3, A method for manufacturing an electromagnetic shielding skin material, characterized in that the epoxy-based mixture mixed with GNP in step c) above is stored in a vacuum at a vacuum level of 1 bar for 1 hour.
  10. In Article 1, A method for manufacturing an electromagnetic shielding skin material characterized in that the above-mentioned diluent consists of BGE (Butyl Glycidyl Ether) or MEK (Methyl Ethyl Ketone).
  11. In any one of paragraphs 1 to 3, A method for manufacturing an electromagnetic shielding skin material, characterized in that the epoxy-based mixture mixed with GNP injected into the cavity of the lower mold in step d) above is heat-cured for 2 hours and 40 minutes at a vacuum of 5 bar and a temperature of 110°C.
  12. An electromagnetic shielding skin material characterized by being manufactured by the method for manufacturing an electromagnetic shielding skin material according to any one of claims 1 to 3.
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Description

Electromagnetic wave shielding skin material manufacturing method and electromagnetic wave shielding skin material manufactured thereby The present invention relates to a method for manufacturing an electromagnetic shielding skin material that not only has excellent strength, rigidity, and corrosion resistance but can also be manufactured as a lightweight material and can easily shield electromagnetic waves, thereby allowing for a gradual increase in usage, and to an electromagnetic shielding skin material manufactured thereby. Automobiles are gradually evolving beyond merely serving as a simple means of transportation into a new concept called mobility. Accordingly, the transportation industry, including automobiles, is showing growing interest in the development of future-oriented innovative technologies such as connected cars, autonomous driving, car sharing, smart vehicles, and electrification. In particular, as the transition to electric, hydrogen, and hybrid vehicles aligns with current trends to improve driver convenience and safety, as well as to address issues of resource depletion and environmental pollution, the electrification of vehicles is accelerating, leading to a rapid increase in the installation of sensors, electronic controls, and auxiliary devices. As power consumption increases due to the high integration of these electronic components, the amount of electromagnetic radiation emitted inside vehicles is also rising. As concerns regarding malfunctions, performance degradation, and safety accidents in vehicle interior electronic components caused by electromagnetic waves increase significantly, it is emerging as a social issue. In addition, the World Health Organization (WHO) has classified the effects of electromagnetic waves on the human body as Group 2B possible carcinogens, and since there are various opinions regarding the development of cancer, it is judged that caution is necessary. As such, due to the gradual integration of automotive electronic components, power consumption within vehicles is increasing day by day, and accordingly, electrical systems are also changing. In addition, as the application of high-output electrical components and intelligent safety systems such as ADAS (Advanced Driver Assist System) to improve vehicle fuel efficiency has reached its limit, the existing 12V electrical system is reaching its limit, and the need for a 48V electrical system is also emerging. However, as power consumption increases, the amount of electromagnetic waves emitted from automobiles also rises; consequently, concerns are being raised regarding the risk of safety accidents, such as malfunctions of electronic components and sudden acceleration, caused by the emission of harmful electromagnetic waves. In response to the necessity of such electromagnetic shielding, shielding methods involving sealing or coating electromagnetic wave sources with metal materials have been proposed, such as in Korean Patent Publication No. 10-2013-0081024; however, problems regarding the achievement of lightweighting are occurring. FIG. 1 is a block diagram schematically illustrating a method for manufacturing an electromagnetic shielding skin material, which is an embodiment of the present invention. Figure 2 is a perspective view schematically showing the lower profile. Figure 3 is a plan view of Figure 2. Figure 4 is a plan view schematically showing the connection state between the discharge line connected to the vacuum pump and the discharge port of the lower mold. FIG. 5 is a perspective view schematically showing the state in which the square frame is separated from the upper part of the lower mold. Figure 6 is a separated cross-sectional view along line A-A of Figure 5. FIG. 7 is a cross-sectional view schematically showing the state in which a square frame is seated on the upper part of the lower mold. FIGS. 8 and 9 are cross-sectional views sequentially showing the process of receiving NCF in a cavity formed on the inner side of a rectangular frame. FIG. 10 is a perspective view schematically showing the figure. FIG. 11 is a perspective view schematically showing an inverted figure. FIG. 12 is a cross-sectional view along line B-B of FIG. 10 schematically showing a state in which a guide line is provided between the injection port and the storage part of the upper mold. FIG. 13 is a cross-sectional view schematically showing the state in which the upper mold is combined with the lower mold. FIG. 14 is a front view schematically showing an example of a storage unit. Fig. 15 is a plan view of Fig. 14. FIG. 16 is a front view schematically showing the state in which an opening/closing plate is fixed in position by a fixing member on the upper part of a storage container. FIG. 17 is a cross-sectional view schematically illustrating the process of injecting a mixture into the cavity of a lower mold. FIG. 18 is a cross-sectional view schematically showing the state in which the upper mold is demolde