Electromagnetic and infrared compatible flexible membrane material

Abstract

The invention relates to the technical field of photoelectric materials, in particular to an electromagnetic and infrared compatible flexible film material which is formed by sequentially arranging five layers of materials, and the five layers of materials sequentially comprise a metal film layer, an electromagnetic absorption layer, an electromagnetic transition layer, an infrared base film layer and an infrared low-emission layer from bottom to top. The electromagnetic / infrared compatible flexible film material prepared by the method provided by the invention is thin in thickness, light in weight and good in weather resistance, and is very suitable for reducing electromagnetic reflection and keeping low infrared emission performance at the same time.

Description

Technical Field

[0001] This invention relates to the field of optoelectronic materials technology, and in particular to a flexible film material that is compatible with both electromagnetic and infrared radiation. Background Technology

[0002] With significant improvements in hardware and software, electromagnetic wave technology has developed rapidly and been widely applied, greatly shortening information exchange time, facilitating people's daily work and life, and promoting the industrialization and informatization of human society. However, at the same time, it has also brought a series of problems, such as information communication interference and interruptions caused by the operation of high-power electronic devices, frequent outbreaks of diseases due to electromagnetic leakage, and high-precision reconnaissance posing certain risks to the security protection capabilities of targets. These problems are real and urgent, becoming the "disaster" product behind the "blessings" brought by electromagnetic wave technology.

[0003] To address this situation, researchers both domestically and internationally have conducted extensive studies, developing product systems such as microwave absorbing materials, electromagnetic shielding materials, and infrared suppression materials, which have solved some problems to a certain extent. However, most existing materials are single-function materials, focusing on electromagnetic or optical aspects, and it is difficult to simultaneously achieve both electro-optical and optical functions, thus failing to meet the urgent needs of complex multi-spectral electromagnetic environments. Therefore, given the current demands for multi-spectral and multi-functional materials, there is an urgent need to develop a new type of electromagnetic / infrared compatible material to effectively address real-world challenges. Summary of the Invention

[0004] The technical problem to be solved by this invention is the lack of dual-functional materials in the field of optoelectronic functional materials technology. In view of the defects in the prior art, this invention provides an electromagnetic and infrared compatible flexible film material.

[0005] To address the aforementioned technical problems, this invention provides an electromagnetically and infrared-compatible flexible film material, which consists of five layers arranged in sequence, from bottom to top including a metal film layer, an electromagnetic absorption layer, an electromagnetic transition layer, an infrared base film layer, and an infrared low-emission layer.

[0006] This invention combines polymeric and inorganic materials through optimized design to develop an electromagnetic / infrared compatible flexible membrane material. The product has both electromagnetic and infrared functions and flexible features, making it suitable for playing a positive role in multiple application scenarios.

[0007] In this invention, each layer of material is produced by hot pressing on a flat plate, and the layers are bonded together using an adhesive film.

[0008] Preferably, the material of the metal film layer is a copper film or an aluminum film.

[0009] Preferably, the electromagnetic absorption layer comprises a compounded rubber and an absorbent, wherein the mass ratio of the compounded rubber to the absorbent is (2~4):(8~6), for example, it can be 2:7, 3:8, 4:7, etc. This layer is prepared by mixing the compounded rubber and the absorbent, allowing them to mature statically, and then proceeding with processes such as kneading, sheeting, and hot pressing.

[0010] In this invention, the compounded rubber is an organic EPDM polymer, which can be purchased through commercial channels; the absorbent is an inorganic metallic magnetic powder, specifically an iron-silicon-aluminum alloy powder (particle size: 10~20μm).

[0011] Preferably, the electromagnetic transition layer is made of a carbon-containing paste coating material, and the sheet resistance of the electromagnetic transition layer is 200~210Ω, for example, 200Ω, 203Ω, 205Ω, 207Ω, or 210Ω. In this invention, different sheet resistance values ​​are used to reduce the rapid abrupt changes of electromagnetic waves between different dielectric surfaces, providing supporting conditions for broadband absorption.

[0012] In this invention, the carbon paste in the carbon paste coating film material is an acetylene carbon black resin solution, with acetylene carbon black accounting for 7% by weight, and the resin is a room temperature two-component epoxy resin.

[0013] Preferably, the infrared base film layer is made of polyethylene terephthalate (PET) or polyimide (PI), and the thickness of the infrared base film layer is 8~12μm, for example, it can be 8μm, 9μm, 10μm, 11μm or 12μm, etc. This layer serves as a low-emission infrared material substrate.

[0014] Preferably, the material of the infrared low-emissivity layer is an optical functional material containing rare earth elements. In this invention, the material of the infrared low-emissivity layer possesses low infrared emissivity and high electromagnetic wave transmittance. In this invention, the optical functional material containing rare earth elements is prepared by magnetron sputtering.

[0015] Preferably, the rare earth element is Ge or Pt, and the thickness of the infrared low-emission layer is 2~4μm.

[0016] Preferably, the electromagnetic and infrared compatible flexible film material has an electromagnetic reflectivity of no more than -11dB at 8~18GHz.

[0017] Preferably, the optical emissivity of the electromagnetically and infrared-compatible flexible film material at 8–14 μm is not higher than 0.4.

[0018] Implementing this invention has the following beneficial effects: The electromagnetic / infrared compatible flexible film material prepared by the method provided in this invention is thin, lightweight, and has good weather resistance, making it highly suitable for simultaneously reducing electromagnetic reflection and maintaining low infrared emission performance. The technical solution provided by this invention is simple to produce, easy to operate, and suitable for use and effective application in related fields. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the layered structure of the electromagnetically and infrared-compatible flexible membrane material provided in Embodiment 1 of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1 This embodiment provides an electromagnetically and infrared compatible flexible film material. The structure comprises five layers from bottom to top: a metal film layer, an electromagnetic absorption layer, an electromagnetic transition layer, an infrared base film layer, and an infrared low-emission layer. The metal film layer, at the bottom, is a good conductor of metal (copper film, 20 μm thick). The electromagnetic absorption layer, located in the spacer layer, is a 0.80 mm thick mixture of compounded rubber and absorbent at a mass ratio of 81:19, cured by static curing, followed by rolling, sheeting, and hot pressing. The electromagnetic transition layer, located in the spacer layer, is a carbon-based paste-coated film material with a sheet resistance of 210 Ω, used to reduce rapid abrupt changes in electromagnetic waves between different dielectric surfaces. The infrared base film layer, located in the spacer layer, is an ultra-thin polymer material (PET, 10 μm thick). The infrared low-emission layer, located in the spacer layer, is an optical functional material containing rare earth elements (Ge film, 3 μm thick). These five layers are combined sequentially, bonded together with an epoxy film, and formed into an electromagnetic / infrared compatible flexible film material through a flatbed hot-pressing process. The electromagnetic reflectivity (8–18 GHz) is ≤-8.0. dB, optical emissivity (8–14 μm) ≤0.35. See the schematic diagram below. Figure 1 As shown.

[0022] Example 2 This embodiment provides an electromagnetically and infrared compatible flexible film material. The structure comprises five layers from bottom to top: a metal film layer, an electromagnetic absorption layer, an electromagnetic transition layer, an infrared base film layer, and an infrared low-emission layer. The metal film layer, at the bottom, is made of a good conductor of metal (copper film, 20 μm thick). The electromagnetic absorption layer, located in the spacer layer, is a mixture of compounded rubber and absorbent at a mass ratio of 81:19, 0.90 mm thick, cured by static curing, and then processed through rolling, sheeting, and hot pressing. The electromagnetic transition layer, located in the spacer layer, is a carbon-based paste-coated film material with a sheet resistance of 210 Ω, used to reduce rapid abrupt changes in electromagnetic waves between different media. The infrared base film layer, located in the spacer layer, is an ultra-thin polymer material (PET, 10 μm thick). The infrared low-emission layer, located in the spacer layer, is an optical functional material containing rare earth elements (Ge film, 2.0 μm thick). These five layers are combined sequentially, bonded together with an epoxy film, and formed into an electromagnetic / infrared compatible flexible film material after a flatbed hot pressing process. The electromagnetic reflectivity is (8–18). ≤-10 dB (GHz), optical emissivity (8~14μm) ≤0.30.

[0023] Example 3 This embodiment provides an electromagnetically and infrared compatible flexible film material. The structure comprises five layers from bottom to top: a metal film layer, an electromagnetic absorption layer, an electromagnetic transition layer, an infrared base film layer, and an infrared low-emission layer. The metal film layer, at the bottom, is made of a good conductor of metal (copper film, 20 μm thick). The electromagnetic absorption layer, located in the spacer layer, is a 1.00 mm thick mixture of compounded rubber and absorbent at a mass ratio of 83:17, cured by static curing, sheeting, and hot pressing. The electromagnetic transition layer, located in the spacer layer, is a carbon-based paste-coated film material with a sheet resistance of 210 Ω, used to reduce rapid abrupt changes in electromagnetic waves between different media. The infrared base film layer, located in the spacer layer, is an ultra-thin polymer material (PET, 10 μm thick). The infrared low-emission layer, located in the spacer layer, is an optical functional material containing rare earth elements (Ge film, 4.0 μm thick). These five layers are combined sequentially, bonded together with an epoxy film, and formed into an electromagnetic / infrared compatible flexible film material after a flatbed hot-pressing process. The electromagnetic reflectivity is (8–18). ≤-9 dB (GHz), optical emissivity (8~14μm) ≤0.28.

[0024] Example 4 This embodiment provides an electromagnetically and infrared compatible flexible film material. The structure comprises five layers from bottom to top: a metal film layer, an electromagnetic absorption layer, an electromagnetic transition layer, an infrared base film layer, and an infrared low-emission layer. The metal film layer, at the bottom, is made of a good conductor of metal (copper film, 20 μm thick). The electromagnetic absorption layer, located in the spacer layer, is a 1.10 mm thick mixture of compounded rubber and absorbent at a mass ratio of 81:19, cured by static curing, sheeting, and hot pressing. The electromagnetic transition layer, located in the spacer layer, is a carbon-based paste-coated film material with a sheet resistance of 230 Ω, used to reduce rapid abrupt changes in electromagnetic waves between different media. The infrared base film layer, located in the spacer layer, is an ultra-thin polymer material (PET, 10 μm thick). The infrared low-emission layer, located in the spacer layer, is an optical functional material containing rare earth elements (Ge film, 3.0 μm thick). These five layers are combined sequentially, bonded together with an epoxy film, and formed into an electromagnetic / infrared compatible flexible film material after a flatbed hot-pressing process. The electromagnetic reflectivity is (8–18). ≤-10 dB (GHz), optical emissivity (8~14μm) ≤0.31.

[0025] Example 5 This embodiment provides an electromagnetically and infrared compatible flexible film material. The structure comprises five layers from bottom to top: a metal film layer, an electromagnetic absorption layer, an electromagnetic transition layer, an infrared base film layer, and an infrared low-emission layer. The metal film layer, at the bottom, is made of a good conductor of metal (copper film, 20 μm thick). The electromagnetic absorption layer, located in the spacer layer, is a 1.10 mm thick mixture of compounded rubber and absorbent at a mass ratio of 82:18, cured and processed through rolling, sheeting, and hot pressing. The electromagnetic transition layer, also in the spacer layer, is a carbon-based paste-coated film material with a sheet resistance of 280 Ω, used to reduce rapid abrupt changes in electromagnetic waves between different media. The infrared base film layer, located in the spacer layer, is an ultra-thin polymer material (PI, 10 μm thick). The infrared low-emission layer, located in the spacer layer, is an optical functional material containing rare earth elements (Ge film, 4.0 μm thick). These five layers are combined sequentially, bonded together with an epoxy film, and formed into an electromagnetic / infrared compatible flexible film material through a flatbed hot pressing process. The electromagnetic reflectivity is (8–18). ≤-11 dB (GHz), optical emissivity (8~14μm) ≤0.26.

[0026] Comparative Example 1 The difference between this comparative example and Example 1 is that this comparative example does not contain an electromagnetic absorption layer. The material has no electromagnetic wave absorption properties, only optical properties, with an optical emissivity (8-14 μm) ≤0.35.

[0027] Comparative Example 2 The difference between this comparative example and Example 1 is that this comparative example does not include an electromagnetic transition layer.

[0028] The electromagnetic absorption performance decreases, with electromagnetic reflectivity (8–18 GHz) ≤ -7.0 dB and optical emissivity (8–14 μm) ≤ 0.35.

[0029] Comparative Example 3 The difference between this comparative example and Example 1 is that this comparative example does not include an infrared base film layer.

[0030] Optical performance degrades, with electromagnetic reflectivity (8–18 GHz) ≤ -9 dB and optical emissivity (8–14 μm) ≤ 0.41.

[0031] Comparative Example 4 The difference between this comparative example and Example 1 is that it includes a 5-layer structure from bottom to top: a metal film layer, an electromagnetic transition layer, an electromagnetic absorption layer, an infrared base film layer, and an infrared low-emission layer.

[0032] The electromagnetic absorption performance decreases, with electromagnetic reflectivity (8–18 GHz) ≤ -6.0 dB and optical emissivity (8–14 μm) ≤ 0.35.

[0033] Comparative Example 5 The difference between this comparative example and Example 1 is that it includes a 5-layer structure from bottom to top: a metal film layer, an electromagnetic transition layer, an infrared base film layer, an electromagnetic absorption layer, and an infrared low-emission layer.

[0034] Both electromagnetic absorption performance and optical performance are reduced, with electromagnetic reflectivity (8–18 GHz) ≤ -5.0 dB and optical emissivity (8–14 μm) ≤ 0.75.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electromagnetic and infrared compatible flexible film material, characterized by: The electromagnetic and infrared compatible flexible film material is arranged in five layers in sequence, and comprises, from bottom to top, a metal film layer, an electromagnetic absorption layer, an electromagnetic transition layer, an infrared base film layer and an infrared low-emission layer.

2. The electromagnetic and infrared compatible flexible film material of claim 1, wherein: The material of the metal film layer is a metal copper film or a metal aluminum film.

3. The electromagnetic and infrared compatible flexible film material of claim 1, wherein: The electromagnetic absorption layer comprises mixed rubber and an absorbent, and the mass ratio of the mixed rubber to the absorbent is (2-4):(8-6).

4. The electromagnetic and infrared compatible flexible film material of claim 1, wherein: The material of the electromagnetic transition layer is a carbon-containing paste coating film material, and the square resistance of the electromagnetic transition layer is 200-210 Omega.

5. The electromagnetic and infrared compatible flexible film material of claim 1, wherein: The material of the infrared base film layer is polyethylene terephthalate or polyimide, and the thickness of the infrared base film layer is 8-12 mu m.

6. The electromagnetic and infrared compatible flexible film material of claim 1, wherein: The material of the infrared low-emission layer is an optical functional material containing a rare earth element.

7. The electromagnetic and infrared compatible flexible film material of claim 6, wherein: The rare earth element is Ge or Pt, and the thickness of the infrared low-emission layer is 2-4 mu m.

8. The electromagnetic and infrared compatible flexible film material of claim 1, wherein: The electromagnetic reflectivity of the electromagnetic and infrared compatible flexible film material is not higher than -11 dB at 8-18 GHz.

9. The electromagnetic and infrared compatible flexible film material of claim 1, wherein: The optical emissivity of the electromagnetic and infrared compatible flexible film material is not higher than 0.4 at 8-14 mu m.

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