Flexible multilayer wave-absorbing composite tape

Abstract

The application discloses a flexible multilayer wave-absorbing composite material adhesive tape, which is composed of a wave-transparent layer, a first wave-absorbing layer, a second wave-absorbing layer and a reflecting layer which are sequentially laminated and bonded, and the bottom surface of the reflecting layer is coated with a back adhesive; wherein the wave-transparent layer is made of a low dielectric constant material and has a thickness of 0.5-1.0 mm; the first wave-absorbing layer is made of a super material and is arranged below the wave-transparent layer and has a thickness of 1-3 mm; the second wave-absorbing layer is made of wave-absorbing foam or wave-absorbing honeycomb and is arranged below the first wave-absorbing layer and has a thickness of 2.5-3.0 mm; and the reflecting layer is arranged below the second wave-absorbing layer and has a thickness of 0.5-1.0 mm. The flexible multilayer wave-absorbing composite material adhesive tape can reduce the weight of the composite wave-absorbing material, broaden the absorption frequency band, increase the wave-absorbing intensity, and has excellent load-bearing performance, heat resistance, flexibility and oxidation resistance.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of microwave absorption composite materials, and particularly relates to a flexible multilayer wave-absorbing composite material adhesive tape. BACKGROUND

[0002] Wave-absorbing materials refer to a kind of materials that can convert electromagnetic waves projected onto their surfaces into other forms of energy and consume them. Generally, wave-absorbing agents are used as the main body to convert electromagnetic waves into heat or other forms of energy in the form of insulation loss, magnetic loss and impedance loss to achieve the purpose of absorbing electromagnetic waves. Wave-absorbing materials can be divided into coated wave-absorbing materials and structural wave-absorbing materials.

[0003] Traditional coated wave-absorbing materials have a series of problems in actual engineering use. For example, the existing wave-absorbing coating has a narrow absorption frequency band, which cannot meet the uninterrupted detection of various detection methods in modern battlefield environments. The overall weight of the coating is large and the thickness is thick, which limits the use in aircraft and certain special part positions. In actual use, the thermal stability is poor, which cannot meet the requirements of all-weather operation. In addition, the traditional wave-absorbing coating is prone to falling off after long-term use, which requires regular and frequent maintenance and repair of the wave-absorbing coating, limiting the use of weapons and equipment. The traditional wave-absorbing coating does not have a bearing capacity and has a single function, which cannot meet the design requirements of radar wave-absorbing performance and appearance. SUMMARY

[0004] Therefore, some embodiments disclose a flexible multilayer wave-absorbing composite material adhesive tape, which is composed of a wave-transparent layer, a first wave-absorbing layer, a second wave-absorbing layer and a reflective layer in sequence, and the bottom surface of the reflective layer is coated with an adhesive.

[0005] The wave-transparent layer is made of a low dielectric constant material and has a thickness of 0.5-1.0 mm.

[0006] The first wave-absorbing layer is made of a metamaterial and is arranged below the wave-transparent layer, and has a thickness of 1-3 mm.

[0007] The second wave-absorbing layer is made of wave-absorbing foam or wave-absorbing honeycomb and is arranged below the first wave-absorbing layer, and has a thickness of 2.5-3.0 mm.

[0008] The reflective layer is arranged below the second wave-absorbing layer and has a thickness of 0.5-1.0 mm.

[0009] Some embodiments disclose a flexible multilayer wave-absorbing composite material adhesive tape, wherein the low dielectric constant material is glass fiber, quartz fiber or ultrahigh molecular weight polyethylene.

[0010] Some embodiments disclose a flexible multilayer wave-absorbing composite material adhesive tape, wherein the metamaterial is a frequency selective surface two-dimensional metamaterial.

[0011] The flexible multilayer wave-absorbing composite tape disclosed by some embodiments, the preparation raw material of the wave-absorbing foam includes dielectric material, magnetic material and foaming resin; the mass ratio of the dielectric material, the magnetic material and the foaming resin is 2-3:3-5:5-6; wherein the dielectric material is graphene, multi-walled carbon nanotube, carbon black or silicon carbide; the magnetic material is hydroxyl iron powder, ferrite, iron-silicon-aluminum or nickel metal; the foaming resin is polyurethane;

[0012] The wave-absorbing foam is obtained by blending, extruding and molding the dielectric material, the magnetic material and the foaming resin in a set proportion.

[0013] The flexible multilayer wave-absorbing composite tape disclosed by some embodiments, the preparation raw material of the wave-absorbing honeycomb includes electromagnetic wave absorbing loss agent, polymer solution and honeycomb structure material; wherein the electromagnetic wave absorbing loss agent is obtained by mixing the dielectric material and the magnetic material in a set proportion; the dielectric material is carbon black, graphene or multi-walled carbon nanotube; the magnetic material is carbonyl iron, ferrite or nickel metal; the polymer solution is water-based polyurethane, polyvinylpyrrolidone aqueous solution or polyvinyl alcohol;

[0014] The electromagnetic wave absorbing loss agent is dispersed in the polymer solution and coated on the honeycomb structure material, and then dried to obtain the wave-absorbing honeycomb.

[0015] The flexible multilayer wave-absorbing composite tape disclosed by some embodiments, the reflective layer is a woven cloth formed by weaving nickel-plated carbon fibers, copper-plated carbon fibers or nano-silicon carbide-plated carbon fibers.

[0016] The flexible multilayer wave-absorbing composite tape disclosed by some embodiments, the thickness of the nickel layer in the nickel-plated carbon fiber is 0.2-0.3 microns; the thickness of the copper layer in the copper-plated carbon fiber is 0.2-0.3 microns; the thickness of the silicon carbide layer in the nano-silicon carbide-plated carbon fiber is 0.2-0.3 microns.

[0017] The flexible multilayer wave-absorbing composite tape disclosed by some embodiments, the areal density of the woven cloth is 20-100 g / m 2 .

[0018] The flexible multilayer wave-absorbing composite tape disclosed by some embodiments, the adhesive is water-based polyurethane or polyvinyl alcohol.

[0019] The flexible multilayer wave-absorbing composite tape disclosed by some embodiments, the back adhesive is polyacrylic acid, PU or silicone.

[0020] The flexible multilayer absorbing composite material tape disclosed in this invention comprises a wave-transmitting layer, a first absorbing layer, a second absorbing layer, and a reflective layer. Through the stacking of different functional layers, it not only reduces the weight of the composite absorbing material, broadens the absorption bandwidth, and increases absorption intensity, but also possesses excellent load-bearing capacity, heat resistance, flexibility, and oxidation resistance. The flexible multilayer absorbing composite material tape disclosed in this invention can be applied to radar absorbing structures, absorbing electromagnetic waves to reduce the radar detectability cross-section of aircraft, thereby improving the survivability and mission capabilities of aircraft. Attached Figure Description

[0021] Figure 1 Example 1: Schematic diagram of flexible multilayer microwave absorbing composite material tape;

[0022] Figure 2 Schematic diagram of the first absorbing layer in Example 1;

[0023] Figure 3 Example 1: Reflectivity test curve of flexible multilayer absorbing composite material tape;

[0024] Figure 4 Example 2: Schematic diagram of flexible multilayer microwave absorbing composite material tape;

[0025] Figure 5 Example 2: Reflectivity test curve of flexible multilayer absorbing composite material tape.

[0026] Figure Labels

[0027] 1 Wave-transmitting layer 2 First absorbing layer

[0028] 3 Second absorbing layer 4 Reflecting layer

[0029] 21 Square metal rings Detailed Implementation

[0030] The term "embodiment" used herein, as an example, is not necessarily to be construed as superior to or better than other embodiments. Performance testing in the embodiments of this application, unless otherwise specified, employs conventional testing methods in the art. It should be understood that the terminology used in this application is merely for describing particular implementations and is not intended to limit the scope of this disclosure.

[0031] Unless otherwise stated, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; other experimental methods and technical means not specifically mentioned herein refer to experimental methods and technical means commonly used by one of ordinary skill in the art.

[0032] The terms "substantial" and "about" are used herein to describe small fluctuations. For example, they can mean less than or equal to ± 5%, such as less than or equal to ± 2%, such as less than or equal to ± 1%, such as less than or equal to ± 0.5%, such as less than or equal to ± 0.2%, such as less than or equal to ± 0.1%, such as less than or equal to ± 0.05%. Numerical data may, in some instances, be presented in a range format. It is to be understood that such a range format is used only for convenience and brevity and should be understood as a shorthand for describing individual values that fall within the range. For example, a range of "1 to 5%" should be interpreted to include not only the explicitly recited values of 1% to 5%, but also the individual values of 2%, 3.5%, and 4%, and the sub-ranges of 1-3%, 2-4%, and 3-5%, etc. This same principle applies to ranges reciting only one numerical value. Furthermore, such an interpretation should apply regardless of the breadth of the range or the characteristics being described.

[0033] In this document, including in the claims, the conjunctions, such as "comprising", "including", "containing", "having", "involving", "holding", "characterized by", etc. are to be understood as open-ended, i.e. as meaning "including but not limited to". Only the conjunctions "consisting of" and "consisting exclusively of" are closed conjunctions.

[0034] For the purpose of the present application, numerous specific details are set forth in the following description in order to provide a thorough understanding. It will be appreciated, however, that the present application can be practiced in an embodiment that does not include some of the specific details described below. In other instances, some methods, means, instruments, apparatuses, etc. known in the art can not be described in detail because they can be readily understood from the description and illustrations of the present application.

[0035] The technical features disclosed by the embodiments of the present application can be combined arbitrarily without conflict, and the technical solutions obtained by the combination belong to the disclosure of the embodiments of the present application. It should be noted that the terms "center", "vertical", "horizontal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like described herein indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the technical features and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application, unless it conflicts with the context. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance, unless it conflicts with the context.

[0036] In some embodiments, the flexible multilayer wave-absorbing composite tape is composed of a wave-transparent layer, a first wave-absorbing layer, a second wave-absorbing layer, and a reflecting layer, which are sequentially laminated and bonded, and the bottom surface of the reflecting layer is coated with an adhesive;

[0037] The wave-transparent layer is made of a low dielectric constant material and has a thickness of 0.5-1.0 mm. The low dielectric constant material is conducive to matching the impedance with air, increasing the transmission rate of electromagnetic waves, and making as many incident electromagnetic waves as possible enter the wave-absorbing layer.

[0038] The first wave-absorbing layer is made of a metamaterial and is arranged below the wave-transparent layer, with a thickness of 1-3 mm. The metamaterial is a kind of artificial material composed of sub-wavelength structural units. By arranging resonant units in a periodic, quasi-periodic or disordered manner, the metamaterial can exhibit artificially customized permittivity and permeability according to a predetermined spatial distribution, thereby completely controlling the amplitude, phase and polarization of electromagnetic waves.

[0039] The second wave-absorbing layer is made of wave-absorbing foam or wave-absorbing honeycomb and is arranged below the first wave-absorbing layer, with a thickness of 2.5-3.0 mm. The wave-absorbing foam or wave-absorbing honeycomb has the characteristics of high strength and high stiffness, can be used as a load-bearing component, can significantly increase the structural sectional moment of inertia, thereby improving the stiffness of the structure, and can reduce the weight of the structure. The wave-absorbing foam or wave-absorbing honeycomb can scatter and absorb incident electromagnetic waves multiple times, thereby maximizing the attenuation of radar wave energy and achieving excellent broadband wave-absorbing effect.

[0040] The reflecting layer is arranged below the second wave-absorbing layer and has a thickness of 0.5-1.0 mm. The reflecting layer is used to reflect the electromagnetic waves that have transmitted through the second wave-absorbing layer and reached the reflecting layer back to the second wave-absorbing layer, so that the second wave-absorbing layer scatters and absorbs the electromagnetic waves again.

[0041] In some embodiments, the low dielectric constant material is glass fiber, quartz fiber or ultra-high molecular weight polyethylene.

[0042] In some embodiments, the raw materials for preparing the wave-absorbing foam include: a dielectric material, a magnetic material, and a foaming resin. The mass ratio of the dielectric material, the magnetic material, and the foaming resin is 2-3:3-5:5-6. The dielectric material is graphene, multi-walled carbon nanotube, carbon black or silicon carbide. The magnetic material is hydroxyl iron powder, ferrite, iron-silicon-aluminum or nickel metal. The foaming resin is polyurethane. Generally, the dielectric material and the magnetic material can construct a microcircuit network with a space resistor, generate dielectric loss through charge carrier movement, convert oscillating electric field into heat through charge carriers, and dissipate microwave energy. Generally, silicon carbide is used to generate dielectric loss caused by interfacial polarization loss, and hydroxyl iron powder is used to provide magnetic loss caused by domain wall motion and spin rotation.

[0043] The wave-absorbing foam is obtained by blending, extruding and molding the dielectric material, the magnetic material and the foaming resin according to a set proportion.

[0044] In some embodiments, the preparation raw material of the wave-absorbing honeycomb includes: an electromagnetic wave absorption loss agent, a polymer solution and a honeycomb structure material; the electromagnetic wave absorption loss agent is obtained by mixing the dielectric material and the magnetic material according to a set proportion; the dielectric material is carbon black, graphene or multi-walled carbon nanotube; the magnetic material is carbonyl iron, ferrite or nickel metal; the polymer solution is water-based polyurethane, polyvinylpyrrolidone aqueous solution or polyvinyl alcohol; the electromagnetic wave absorption loss agent is dispersed in the polymer solution and coated on the honeycomb structure material, and then dried to obtain the wave-absorbing honeycomb; generally, the honeycomb structure material is immersed in the polymer solution for a certain time to ensure that the polymer solution is completely coated on the honeycomb structure; generally, the weight gain of the honeycomb structure material can be controlled by the number of immersion times.

[0045] As an optional embodiment, the honeycomb structure material is aramid paper honeycomb.

[0046] In some embodiments, the metamaterial is a two-dimensional metamaterial of frequency selective surface, and a periodic pattern is printed or etched on the surface of the metamaterial to achieve wideband absorption; generally, the periodic pattern is designed by using the phase gradient principle, a thin copper layer is plated on the PEEK film by magnetron sputtering, and then the periodic metal units are etched on the PEEK film according to the designed pattern by wet etching to obtain the metamaterial; generally, the periodic metal units can effectively resonate in the electromagnetic field at a specific wavelength, cause the phase shift of the incident radar wave, and produce a phase gradient on the surface.

[0047] In some embodiments, the reflective layer is a woven cloth formed by weaving nickel-plated carbon fibers, copper-plated carbon fibers or nano-silicon carbide-plated carbon fibers; generally, a layer of nickel is plated on the surface of the carbon fiber to form nickel-plated carbon fiber; a layer of copper is plated on the surface of the carbon fiber to form copper-plated carbon fiber; a layer of nano-silicon carbide is plated on the surface of the carbon fiber to form nano-silicon carbide-plated carbon fiber.

[0048] In some embodiments, the thickness of the nickel layer in the nickel-plated carbon fiber is 0.2-0.3 μm; the thickness of the copper layer in the copper-plated carbon fiber is 0.2-0.3 μm; the thickness of the silicon carbide layer in the nano-silicon carbide-plated carbon fiber is 0.2-0.3 μm.

[0049] In some embodiments, the areal density of the woven cloth is 20-100 g / m 2 .

[0050] In some embodiments, the adhesive is water-based polyurethane or polyvinyl alcohol.

[0051] In some embodiments, the back adhesive is polyacrylic acid, PU or silicone.

[0052] The technical details are further illustrated below with examples.

[0053] Example 1

[0054] Figure 1 A schematic diagram of the flexible multilayer wave-absorbing composite tape disclosed in Example 1; Figure 2 A schematic diagram of the first wave-absorbing layer disclosed in Example 1; Figure 3 A reflectivity test curve of the flexible multilayer wave-absorbing composite tape disclosed in Example 1.

[0055] As shown in Figure 1 , the flexible multilayer wave-absorbing composite tape is composed of a wave-transparent layer 1, a first wave-absorbing layer 2, a second wave-absorbing layer 3, and a reflective layer 4, which are sequentially laminated and bonded by water-based polyurethane, and the bottom surface of the reflective layer 4 is coated with polyacrylic acid. The first wave-absorbing layer 2 is arranged below the wave-transparent layer 1 and is in close contact with the bottom surface of the wave-transparent layer 1; the second wave-absorbing layer 3 is arranged below the first wave-absorbing layer 2 and is in close contact with the bottom surface of the first wave-absorbing layer 2; and the reflective layer 4 is arranged below the second wave-absorbing layer 3 and is in close contact with the bottom surface of the second wave-absorbing layer 3.

[0056] The wave-transparent layer 1 is composed of glass fibers, with a thickness of 1 mm, and has good wave-transparency. When electromagnetic waves are incident, it interacts with the wave-transmitting skin to achieve good impedance matching with free space and increase the transmission rate.

[0057] The first wave-absorbing layer 2 is a metamaterial with a thickness of 2 mm, as shown in Figure 2 , the surface of the first wave-absorbing layer 2 is provided with periodic square metal rings 21, the side length of the square metal rings 21 is 25 mm, and the distance between adjacent square metal rings 21 is 20 mm. The periodic square metal rings 21 can effectively resonate in the electromagnetic field at a specific wavelength, causing a phase shift of the incident radar wave and producing a phase gradient on the surface.

[0058] The second wave-absorbing layer 3 is a wave-absorbing honeycomb with a thickness of 3 mm. Cubic silicon carbide powder and water-based polyurethane are mixed in a ratio of 1:5, and then 40wt% hydroxyl iron powder is added and stirred with a mechanical stirrer to form a slurry. The slurry is poured into an impregnation container and the aramid paper honeycomb is impregnated for 20 min. During the impregnation, the aramid paper honeycomb is gently stirred with tweezers to ensure complete impregnation. Then the impregnated aramid paper honeycomb is taken out and placed in a drying oven to heat to 120℃ for 1h for curing to obtain the wave-absorbing honeycomb.

[0059] The reflective layer 4 is a plain woven fabric made of nickel-plated carbon fibers, with a thickness of 1 mm and a surface density of 70g / m 2 .

[0060] The flexible multilayer wave-absorbing composite tape prepared in the embodiment can withstand high temperature of 280°C; the reflectivity test results of the flexible multilayer wave-absorbing composite tape prepared in the embodiment are shown in Figure 3 FIG. 2, the average reflectivity of the flexible multilayer wave-absorbing composite tape prepared in the embodiment is ≤-5dB in the range of 2-8GHz, and the average reflectivity is ≤-12dB in the range of 8-18GHz.

[0061] Embodiment 2

[0062] Figure 4 FIG. 1 is a schematic diagram of the flexible multilayer wave-absorbing composite tape disclosed in Embodiment 2; Figure 5 FIG. 2 is a reflectivity test curve diagram of the flexible multilayer wave-absorbing composite tape disclosed in Embodiment 2.

[0063] As shown in Figure 4 FIG. 1, the flexible multilayer wave-absorbing composite tape is composed of a wave-transparent layer 1, a first wave-absorbing layer 2, a second wave-absorbing layer 3, and a reflective layer 4 which are sequentially adhered by polyvinyl alcohol, and the reflective layer 4 is coated with polyacrylic acid on the bottom surface, wherein the first wave-absorbing layer 2 is arranged below the wave-transparent layer 1 and is attached to the bottom surface of the wave-transparent layer 1; the second wave-absorbing layer 3 is arranged below the first wave-absorbing layer 2 and is attached to the bottom surface of the first wave-absorbing layer 2; and the reflective layer 4 is arranged below the second wave-absorbing layer 3 and is attached to the bottom surface of the second wave-absorbing layer 3.

[0064] The wave-transparent layer 1 is composed of quartz fiber and has a thickness of 1mm, and has good wave-transparency. When electromagnetic waves are incident, the wave-transparent layer 1 interacts with the wave-transmitting skin to achieve good impedance matching with the free space and increase the transmission rate.

[0065] The first wave-absorbing layer 2 is a metamaterial and has a thickness of 2mm. The surface of the first wave-absorbing layer 2 is provided with periodic square metal rings, the side length of the square metal ring is 25mm, and the distance between adjacent square metal rings is 20mm. The periodic square metal rings can effectively resonate in the electromagnetic field at a specific wavelength, cause the phase shift of the incident radar wave, and produce a phase gradient on the surface.

[0066] The second wave-absorbing layer 3 is a wave-absorbing foam and has a thickness of 3mm. The wave-absorbing foam is obtained by mixing, extruding and winding silicon carbide, hydroxyl iron powder and water-based polyurethane in a ratio of 1:2:5.

[0067] The reflective layer 4 is a woven cloth made of copper-plated carbon fibers which are spread and woven into a plain weave, and has a thickness of 1mm and a surface density of 50g / m 2 .

[0068] The flexible multilayer wave-absorbing composite tape prepared in the embodiment can withstand high temperature of 280°C; the reflectivity test results of the flexible multilayer wave-absorbing composite tape prepared in the embodiment are shown in Figure 5As shown, the flexible multilayer wave-absorbing composite tape prepared in the embodiment has an average reflectivity of less than or equal to -5 dB in a range of 2-8 GHz, and an average reflectivity of less than or equal to -10 dB in a range of 8-18 GHz.

[0069] The flexible multilayer wave-absorbing composite tape disclosed in the embodiment comprises a wave-transparent layer, a first wave-absorbing layer, a second wave-absorbing layer and a reflecting layer, and through the stacking of different functional layers, the weight of the wave-absorbing composite material is reduced, the absorption frequency band is widened, the wave-absorbing intensity is increased, and excellent load-bearing performance, heat resistance, flexibility and oxidation resistance are achieved.

[0070] The technical details disclosed in the technical scheme and the embodiment of the present application are only exemplary to illustrate the inventive concept of the present application, and do not constitute a limitation on the technical scheme of the present application. Any conventional changes, substitutions or combinations of the technical details disclosed in the embodiment of the present application are within the protection scope of the claims of the present application.

Claims

1. A flexible multilayer wave-absorbing composite tape, characterized in that, The wave-transparent layer, the first wave-absorbing layer, the second wave-absorbing layer and the reflecting layer are sequentially bonded to form a wave-absorbing structure, and the bottom surface of the reflecting layer is coated with a back adhesive. The wave-transparent layer is made of a low dielectric constant material and has a thickness of 0.5-1.0 mm. The first wave-absorbing layer is made of a metamaterial and is arranged below the wave-transparent layer and has a thickness of 1-3 mm; the metamaterial is a two-dimensional metamaterial of frequency selective surface, a periodic pattern is designed by using a phase gradient principle, a thin copper layer is plated on a PEEK film by magnetron sputtering, and then the PEEK film is wet etched according to the designed pattern to obtain the metamaterial. The second wave-absorbing layer is made of wave-absorbing foam or wave-absorbing honeycomb and is arranged below the first wave-absorbing layer and has a thickness of 2.5-3.0 mm. The preparation raw materials of the wave-absorbing foam include a dielectric material, a magnetic material and a foaming resin, and the mass ratio of the dielectric material, the magnetic material and the foaming resin is 2-3:3-5:5-6; the dielectric material is graphene, multi-walled carbon nanotube, carbon black or silicon carbide; the magnetic material is hydroxyl iron powder, ferrite, iron-silicon-aluminum or nickel metal; the foaming resin is polyurethane; and the wave-absorbing foam is obtained by blending, extruding and molding the dielectric material, the magnetic material and the foaming resin according to the set proportion. The preparation raw materials of the wave-absorbing honeycomb include an electromagnetic wave absorption loss agent, a polymer solution and a honeycomb structure material; the electromagnetic wave absorption loss agent is obtained by mixing the dielectric material and the magnetic material according to a set proportion; the dielectric material is carbon black, graphene or multi-walled carbon nanotube; the magnetic material is carbonyl iron, ferrite or nickel metal; the polymer solution is water-based polyurethane, polyvinylpyrrolidone aqueous solution or polyvinyl alcohol; the electromagnetic wave absorption loss agent is dispersed in the polymer solution and coated on the honeycomb structure material, and then the wave-absorbing honeycomb is obtained by drying. The reflecting layer is arranged below the second wave-absorbing layer and has a thickness of 0.5-1.0 mm.

2. The flexible multilayer wave-absorbing composite tape of claim 1, wherein, The low dielectric constant material is glass fiber, quartz fiber or ultra-high molecular weight polyethylene.

3. The flexible multilayer wave-absorbing composite tape of claim 1, wherein, The reflecting layer is a woven cloth formed by weaving nickel-plated carbon fiber, copper-plated carbon fiber or nano-silicon carbide-plated carbon fiber.

4. The flexible multilayer wave-absorbing composite tape of claim 3, wherein, The thickness of the nickel layer in the nickel-plated carbon fiber is 0.2-0.3 µm; the thickness of the copper layer in the copper-plated carbon fiber is 0.2-0.3 µm; and the thickness of the silicon carbide layer in the nano-silicon carbide-plated carbon fiber is 0.2-0.3 µm.

5. The flexible multilayer wave-absorbing composite tape of claim 3, wherein, The areal density of the woven cloth is 20 g / m 2 ~ 100 g / m 2 .

6. The flexible multilayer wave-absorbing composite tape of claim 1, wherein, The back adhesive is polyacrylic acid, PU or silicone.

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