Scratch-resistant electromagnetic shielding film

Abstract

The utility model discloses a kind of scratch-resistant electromagnetic shielding film, it is related to electromagnetic shielding film technical field, including the substrate support layer with the thickness of 50-100 μm, the top of the substrate support layer is provided with conductive adhesive layer, the top of the conductive adhesive layer is provided with electromagnetic shielding layer, the top of the electromagnetic shielding layer is provided with elastic buffer transition layer, the top of the elastic buffer transition layer is provided with composite reinforcing layer, the top of the composite reinforcing layer is provided with wear-resistant protective layer, the top of the wear-resistant protective layer is provided with anti-fingerprint layer.The utility model realizes the overall optimization of surface performance while guaranteeing electromagnetic shielding performance by the synergistic effect of wear-resistant protective layer and anti-fingerprint layer, wear-resistant protective layer can directly resist scratch, rubbing and other mechanical damage in daily use, and the polytetrafluoroethylene micro powder of self-lubricating layer reduces the risk of scratch when external force acts by reducing surface friction coefficient, and the two form high-efficiency scratch-resistant protective system.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic shielding film technology, specifically to a scratch-resistant electromagnetic shielding film. Background Technology

[0002] Electromagnetic shielding film is a flexible thin film material that can be transparent or opaque. It blocks the propagation path of electromagnetic waves by reflecting, absorbing, and attenuating them multiple times. Through physical barriers and electromagnetic conversion mechanisms, it can block electromagnetic interference, suppress electromagnetic radiation, and protect information security, serving as an "invisible shield" for electronic devices.

[0003] Existing electromagnetic shielding films only use a single layer of organic coating for protection, which has limited hardness and wear resistance. During daily installation, use and maintenance, they are easily scratched or even damaged by friction and abrasion.

[0004] For example, an electromagnetic shielding film disclosed in CN219718984U includes a substrate layer, an electromagnetic shielding layer disposed on the lower side of the substrate layer, and an adhesive layer disposed on the lower side of the electromagnetic shielding layer. The electromagnetic shielding layer is a composite layer of helical carbon nanotubes and polytetrafluoroethylene fibers. Although this patent improves the electromagnetic shielding effect and flexibility through a multi-layer structure design, its protective layer uses conventional resin materials, which have low hardness and lack self-lubricating properties. The surface has insufficient scratch resistance and is prone to wear during long-term use, affecting the stability of shielding performance and the appearance quality of the product.

[0005] Therefore, it is necessary to invent a scratch-resistant electromagnetic shielding film to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a scratch-resistant electromagnetic shielding film, which solves the problem that electromagnetic shielding films have poor wear resistance and are easily scratched or even damaged due to friction and abrasion.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a scratch-resistant electromagnetic shielding film, comprising a base support layer with a thickness of 50-100μm, a conductive adhesive layer disposed above the base support layer, an electromagnetic shielding layer disposed above the conductive adhesive layer, an elastic buffer transition layer disposed above the electromagnetic shielding layer, a composite reinforcement layer disposed above the elastic buffer transition layer, a wear-resistant protective layer disposed above the composite reinforcement layer, the wear-resistant protective layer comprising a ceramic coating and a self-lubricating layer, the ceramic coating being disposed above the self-lubricating layer, the ceramic coating and the self-lubricating layer being interfacially bonded by a coupling agent, and an anti-fingerprint layer disposed above the wear-resistant protective layer.

[0008] Preferably, the substrate support layer is made of PET film, and the substrate support layer and the conductive adhesive layer are bonded together by a roll forming process.

[0009] Preferably, the thickness of the conductive adhesive layer is 15-30 μm, and the conductive adhesive layer is made by mixing epoxy resin adhesive with silver-coated copper powder.

[0010] Preferably, the thickness of the electromagnetic shielding layer is 30-50 μm, and the electromagnetic shielding layer is applied over the conductive adhesive layer by a vacuum sputtering process.

[0011] Preferably, the electromagnetic shielding layer includes an absorbing layer and a reflective layer, which are tightly bonded together by plasma treatment. The absorbing layer is disposed above the reflective layer, which is a ferrite-graphene composite coating, and the reflective layer is a copper-nickel alloy plating.

[0012] Preferably, the thickness of the elastic buffer transition layer is 20-40 μm, the elastic buffer transition layer and the electromagnetic shielding layer are formed by hot pressing, and the elastic buffer transition layer is made of silicone material.

[0013] Preferably, the thickness of the composite reinforcement layer is 25-45 μm, the composite reinforcement layer and the elastic buffer transition layer are bonded together by an adhesive, and the composite reinforcement layer is a woven composite structure of aramid fiber and polyimide film.

[0014] Preferably, the wear-resistant protective layer has a thickness of 8-15 μm, and the wear-resistant protective layer is coated on top of the composite reinforcement layer by a spray curing process. The ceramic coating is an alumina-zirconia composite ceramic, and the self-lubricating layer is a polytetrafluoroethylene micro powder coating.

[0015] Preferably, the thickness of the anti-fingerprint layer is 2-5 μm, and the anti-fingerprint layer and the wear-resistant protective layer are formed by vacuum evaporation process. The anti-fingerprint layer is a fluorosilane-modified nano-silica coating.

[0016] The technical effects and advantages provided by this utility model in the above technical solution are as follows: 1. This utility model achieves comprehensive optimization of surface performance while ensuring electromagnetic shielding performance through the synergistic effect of the wear-resistant protective layer and the anti-fingerprint layer. In the wear-resistant protective layer, the alumina-zirconia composite ceramic coating constructs the first physical barrier with its high hardness characteristics, which can directly resist mechanical damage such as scratches and friction in daily use. The polytetrafluoroethylene micro powder in the self-lubricating layer reduces the risk of scratches when external forces are applied by reducing the surface friction coefficient. The combination of the two forms a highly efficient scratch-resistant protection system. 2. The anti-fingerprint layer of this utility model adopts a fluorosilane-modified nano-silica coating, which can not only reduce fingerprint residue and oil stains through its low surface energy characteristics and maintain surface cleanliness, but also further enhance the surface wear resistance through its dense molecular structure. It complements the wear-resistant protective layer. This design avoids surface wear caused by frequent cleaning and significantly improves the durability of the electromagnetic shielding film through a dual protection mechanism, so that it can maintain good appearance and performance stability in complex use environments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall front structure of this utility model; Figure 3 For the present utility model Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 This is an exploded three-dimensional structural diagram of the electromagnetic shielding layer and elastic buffer transition layer of this utility model. Figure 5 This is a schematic diagram of the exploded three-dimensional structure of the wear-resistant protective layer of this utility model.

[0018] Explanation of reference numerals in the attached figures: 1. Substrate support layer; 2. Conductive adhesive layer; 3. Electromagnetic shielding layer; 301. Wave absorbing layer; 302. Reflective layer; 4. Elastic buffer transition layer; 5. Composite reinforcement layer; 6. Wear-resistant protective layer; 601. Ceramic coating; 602. Self-lubricating layer; 7. Anti-fingerprint layer. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0020] This utility model provides, for example Figure 1-5 The scratch-resistant electromagnetic shielding film shown includes a base support layer 1 with a thickness of 50-100μm, a conductive adhesive layer 2 disposed above the base support layer 1, an electromagnetic shielding layer 3 disposed above the conductive adhesive layer 2, an elastic buffer transition layer 4 disposed above the electromagnetic shielding layer 3, a composite reinforcement layer 5 disposed above the elastic buffer transition layer 4, and a wear-resistant protective layer 6 disposed above the composite reinforcement layer 5. The wear-resistant protective layer 6 includes a ceramic coating 601 and a self-lubricating layer 602. The ceramic coating 601 is disposed above the self-lubricating layer 602, and the ceramic coating 601 and the self-lubricating layer 602 are interfacially bonded by a coupling agent. An anti-fingerprint layer 7 is disposed above the wear-resistant protective layer 6.

[0021] The substrate support layer 1 is made of PET film. The substrate support layer 1 and the conductive adhesive layer 2 are bonded together by a roll forming process. The thickness of the conductive adhesive layer 2 is 15-30μm. The conductive adhesive layer 2 is made of epoxy resin and silver-coated copper powder. The thickness of the electromagnetic shielding layer 3 is 30-50μm. The electromagnetic shielding layer 3 is covered on top of the conductive adhesive layer 2 by a vacuum sputtering process. The electromagnetic shielding layer 3 includes an absorbing layer 301 and a reflective layer 302. The absorbing layer 301 and the reflective layer 302 are tightly bonded by plasma treatment. The absorbing layer 301 is disposed on top of the reflective layer 302. The absorbing layer 301 is a ferrite-graphene composite coating. The reflective layer 302 is a copper-nickel alloy plating.

[0022] In this embodiment, the PET film of the substrate support layer 1 provides basic support for the overall structure. The rolling process makes the interlayer porosity ≤0.5%, improving the continuity of electromagnetic shielding. The three-roll calender is used for gradient heating rolling 60℃→80℃→100℃, with a linear pressure of 100N / cm and a composite speed of 4m / min, so that the conductive filler forms a chain conductive network in the resin matrix. The reflective layer 302 provides high-frequency electromagnetic wave reflection, and the absorbing layer 301 absorbs low- and medium-frequency electromagnetic waves through the synergistic absorption of magnetic loss ferrite and dielectric loss graphene. Plasma treatment further improves the bonding strength between the absorbing layer 301 and the reflective layer 302. The reflective layer 302 + absorbing layer 301 realizes a multi-level shielding mechanism of "reflection-absorption-re-reflection", which further improves the shielding effectiveness of the electromagnetic shielding film.

[0023] The elastic buffer transition layer 4 has a thickness of 20-40μm and is formed by hot pressing with the electromagnetic shielding layer 3. The elastic buffer transition layer 4 is made of silicone. The composite reinforcement layer 5 has a thickness of 25-45μm and is formed by adhesive bonding with the elastic buffer transition layer 4. The composite reinforcement layer 5 is a woven composite structure of aramid fiber and polyimide film. The wear-resistant protective layer 6 has a thickness of 8-15μm and is coated on top of the composite reinforcement layer 5 by spray curing. The ceramic coating 601 is an alumina-zirconia composite ceramic, and the self-lubricating layer 602 is a polytetrafluoroethylene micro powder coating. The anti-fingerprint layer 7 has a thickness of 2-5μm and is formed by vacuum evaporation with the wear-resistant protective layer 6. The anti-fingerprint layer 7 is a fluorosilane modified nano-silica coating.

[0024] In this embodiment, the elastic buffer transition layer 4 has elastic properties that can buffer external stress, preventing stress from being directly transmitted to the electromagnetic shielding layer 3 and protecting the electromagnetic shielding layer 3 from damage. The composite reinforcement layer 5 significantly enhances the overall strength and toughness of the structure, improves the tensile and tear resistance of the structure, and makes the structure more stable and durable. Therefore, the elastic buffer layer 4 and the composite reinforcement layer 5 form a "soft-hard" alternating structure, which improves the overall impact resistance. In addition, the ceramic coating 601 in the wear-resistant protective layer 6 has high hardness and wear resistance, which can effectively resist the friction and scratches of external objects. The self-lubricating layer 602 can reduce the coefficient of friction, reduce wear, and extend the service life of the structure. Furthermore, the anti-fingerprint layer 7 can prevent fingerprints, oil stains, etc. from adhering to the surface of the structure and keep the surface clean. Therefore, the wear-resistant protective layer 6 and the anti-fingerprint layer 7 form a "hard protection-soft lubrication" dual protection system, which effectively improves the wear resistance life of the electromagnetic shielding film surface.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A scratch-resistant electromagnetic shielding film, comprising a substrate support layer (1) with a thickness of 50-100 μm, characterized in that: A conductive adhesive layer (2) is disposed above the substrate support layer (1), an electromagnetic shielding layer (3) is disposed above the conductive adhesive layer (2), an elastic buffer transition layer (4) is disposed above the electromagnetic shielding layer (3), a composite reinforcement layer (5) is disposed above the elastic buffer transition layer (4), a wear-resistant protective layer (6) is disposed above the composite reinforcement layer (5), the wear-resistant protective layer (6) includes a ceramic coating (601) and a self-lubricating layer (602), the ceramic coating (601) is disposed above the self-lubricating layer (602), the ceramic coating (601) and the self-lubricating layer (602) are bonded at the interface by a coupling agent, and an anti-fingerprint layer (7) is disposed above the wear-resistant protective layer (6).

2. The scratch-resistant electromagnetic shielding film according to claim 1, characterized in that: The substrate support layer (1) is made of PET film, and the substrate support layer (1) and the conductive adhesive layer (2) are bonded together by a roll forming process.

3. The scratch-resistant electromagnetic shielding film according to claim 2, characterized in that: The conductive adhesive layer (2) has a thickness of 15-30 μm and is made of epoxy resin adhesive and silver-coated copper powder.

4. The scratch-resistant electromagnetic shielding film according to claim 1, characterized in that: The thickness of the electromagnetic shielding layer (3) is 30-50 μm, and the electromagnetic shielding layer (3) is covered on top of the conductive adhesive layer (2) by vacuum sputtering process.

5. The scratch-resistant electromagnetic shielding film according to claim 4, characterized in that: The electromagnetic shielding layer (3) includes an absorbing layer (301) and a reflective layer (302). The absorbing layer (301) and the reflective layer (302) are tightly bonded by plasma treatment. The absorbing layer (301) is disposed above the reflective layer (302). The absorbing layer (301) is a ferrite-graphene composite coating, and the reflective layer (302) is a copper-nickel alloy plating.

6. The scratch-resistant electromagnetic shielding film according to claim 1, characterized in that: The thickness of the elastic buffer transition layer (4) is 20-40μm. The elastic buffer transition layer (4) and the electromagnetic shielding layer (3) are formed by hot pressing. The elastic buffer transition layer (4) is made of silicone material.

7. The scratch-resistant electromagnetic shielding film according to claim 1, characterized in that: The thickness of the composite reinforcement layer (5) is 25-45 μm. The composite reinforcement layer (5) and the elastic buffer transition layer (4) are bonded together by an adhesive. The composite reinforcement layer (5) is a woven composite structure of aramid fiber and polyimide film.

8. The scratch-resistant electromagnetic shielding film according to claim 1, characterized in that: The wear-resistant protective layer (6) has a thickness of 8-15 μm. The wear-resistant protective layer (6) is coated on top of the composite reinforcing layer (5) by a spray curing process. The ceramic coating (601) is an alumina-zirconia composite ceramic, and the self-lubricating layer (602) is a polytetrafluoroethylene micro powder coating.

9. The scratch-resistant electromagnetic shielding film according to claim 1, characterized in that: The thickness of the anti-fingerprint layer (7) is 2-5 μm. The anti-fingerprint layer (7) and the wear-resistant protective layer (6) are formed by vacuum evaporation process. The anti-fingerprint layer (7) is a fluorosilane modified nano-silica coating.

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