Absorbing rubber gasket, its preparation method and application in electronic devices

Abstract

The present invention relates to a wave-absorbing rubber gasket, a preparation method thereof, and an application in electronic devices. The wave-absorbing rubber gasket includes a gasket body and a composite magnetic material distributed in the gasket body. Among them, the composite magnetic material includes a composite material composed of porous graphene ellipsoids and zinc sulfide nanomaterials, and an organic insulating material coated on the surface of the composite material. In the composite material, a plurality of the porous graphene ellipsoids are arranged in an orderly manner to form a graphene group, and the zinc sulfide nanomaterials are fused in the graphene group. The wave-absorbing rubber gasket of the present invention has excellent wave-absorbing performance. At the same time, it has excellent elasticity and recovery, can adapt to pressure changes and temperature fluctuations, has appropriate softness, and can fit well with the contact surface. Therefore, when the wave-absorbing rubber gasket of the present invention is applied to electronic devices, it has excellent sealing effect and electromagnetic shielding performance, and can effectively reduce the risk of electromagnetic leakage.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic wave absorbing materials, and particularly to an electromagnetic wave absorbing rubber gasket, a preparation method thereof, and an application in electronic devices. Background Art

[0002] An electromagnetic wave absorbing rubber gasket is a thin rubber product that seals between two static surfaces at a metal or other connection part. The electromagnetic wave absorbing rubber gasket has properties such as oil resistance, acid and alkali resistance, cold and heat resistance, and aging resistance, and can be cut into any shape, and has been widely used in industries such as medicine, electronics, chemical industry, antistatic, flame retardant, and food.

[0003] However, traditional electromagnetic wave absorbing rubber gaskets only consider their sealing effect, and the electric field shielding effect is not within their consideration scope. Therefore, when traditional electromagnetic wave absorbing rubber gaskets are applied to electronic devices, there is a risk of electromagnetic leakage. Summary of the Invention

[0004] Based on this, in view of the above technical problems, it is necessary to provide an electromagnetic wave absorbing rubber gasket, a preparation method thereof, and an application in electronic devices, which has excellent sealing effect and electromagnetic shielding performance when applied to electronic devices.

[0005] The present invention provides an electromagnetic wave absorbing rubber gasket, which includes a gasket body and a composite magnetic material distributed in the gasket body;

[0006] Wherein, the composite magnetic material includes a composite material composed of porous graphene ellipsoids and zinc sulfide nanomaterials, and an organic insulating material coated on the surface of the composite material. In the composite material, a plurality of the porous graphene ellipsoids are arranged in an orderly manner to form a graphene group, and the zinc sulfide nanomaterials are fused in the graphene group.

[0007] In one embodiment, the mass fraction of the composite magnetic material in the electromagnetic wave absorbing rubber gasket is 15%-20%.

[0008] In one embodiment, the thickness of the electromagnetic wave absorbing rubber gasket is 1 mm - 5 mm.

[0009] In one embodiment, in the graphene group, the porous graphene ellipsoids are arranged in a three-dimensional array.

[0010] In one embodiment, the equatorial radius of the porous graphene ellipsoids is 100 nm - 120 nm, and the polar radius is 200 nm - 250 nm.

[0011] In one embodiment, the pore diameter of the porous graphene ellipsoids is 14 nm - 25 nm.

[0012] In one embodiment, the ratio of the particle size of the zinc sulfide nanomaterial to the pore size of the porous graphene ellipsoid is 1:8 - 1:12.

[0013] In one embodiment, in the composite magnetic material, the mass ratio of the zinc sulfide nanomaterial to the graphene group is 1:3 - 1:5.

[0014] The present invention also provides a method for preparing the wave - absorbing rubber gasket described above, including plasticizing, mixing, calendering, vulcanizing and forming. Among them, the composite magnetic material is added in the mixing step.

[0015] The present invention also provides an application of the wave - absorbing rubber gasket described above in electronic devices.

[0016] By selecting materials and regulating the structure in the composite magnetic material, the present invention enables the insertion loss of the composite magnetic material to reach about 25 dB in the frequency band of 20 MHz - 1200 MHz, having excellent wave - absorbing performance. At the same time, the composite magnetic material of the present invention takes a graphene group composed of multiple orderly arranged porous graphene ellipsoids as the matrix, fuses zinc sulfide nanomaterials, has a dense structure, good toughness, and is not prone to breakage and failure under load, and has good ductility. Furthermore, by adding the composite magnetic material to the gasket body, the wave - absorbing rubber gasket still has excellent elasticity and recovery, can adapt to pressure changes and temperature fluctuations, has appropriate softness, can fit well with the contact surface, does not harden at low temperature, has a small shrinkage amount, good processability, does not adhere to the sealing surface, and is convenient for installation and disassembly.

[0017] Therefore, when the wave - absorbing rubber gasket of the present invention is applied to electronic devices, it has excellent sealing effect and electromagnetic shielding performance, can effectively reduce the risk of electromagnetic leakage. In particular, it has a more efficient shielding effect on electromagnetic radiation in the range of 30 MHz - 700 MHz. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following - described drawings are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a high - magnification scanning electron microscope image of the graphene group obtained in Example 1;

[0020] Figure 2 It is a high - magnification scanning electron microscope image of the composite magnetic material obtained in Example 1;

[0021] Figure 3 Electromagnetic compatibility radiation harassment diagram of the electromagnetic wave absorbing rubber gasket of Embodiment 1 for electronic device use;

[0022] Figure 4 Electromagnetic compatibility radiation harassment diagram of the rubber gasket of Comparative Example 1 for electronic device use. Specific embodiments

[0023] For ease of understanding of the present invention, the present invention will be described in more detail below. However, it should be understood that the present invention can be implemented in many different forms and is not limited to the embodiments or examples described herein. On the contrary, these embodiments or examples are provided so that the understanding of the disclosure of the present invention is more thorough and comprehensive.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments or examples and are not intended to limit the present invention. The optional scope of the term "and / or" used herein includes any one of two or more related listed items, and also includes any and all combinations of the related listed items, and the any and all combinations include any two related listed items, any more related listed items, or all related listed items.

[0025] The present invention provides an electromagnetic wave absorbing rubber gasket, and the electromagnetic wave absorbing rubber gasket includes a gasket body and a composite magnetic material distributed in the gasket body. It can be understood that the gasket body is a commonly used traditional rubber gasket, such as a rubber flat gasket, a rubber O-ring gasket, a plastic flat gasket, a polytetrafluoroethylene coated gasket, an asbestos electromagnetic wave absorbing rubber gasket, a metal flat gasket, a metal special-shaped gasket, a metal sheathed gasket, a corrugated gasket, a spiral wound gasket, etc.

[0026] Specifically, the composite magnetic material includes a composite material composed of porous graphene ellipsoids and zinc sulfide nanomaterials and an organic insulating material coated on the surface of the composite material. Among them, in the composite material, a plurality of the porous graphene ellipsoids are arranged in an orderly manner to form a graphene group, and the zinc sulfide nanomaterials are fused in the graphene group.

[0027] Specifically, the manner in which the zinc sulfide nanomaterial is incorporated into the graphene group includes: at least a part of the surface of the porous graphene ellipsoids is attached with zinc sulfide nanomaterials, and at least a part of the gaps in the graphene group are filled with zinc sulfide nanomaterials; further, when the particle size of the zinc sulfide nanomaterials is smaller than the pore diameter of the porous graphene ellipsoids, the manner in which the zinc sulfide nanomaterial is incorporated into the graphene group further includes that at least a part of the pores of the porous graphene ellipsoids contain zinc sulfide nanomaterials. Of course, the specific incorporation manner will not have a substantial impact on the wave absorption performance.

[0028] Different structural types and different materials have different electromagnetic wave conversion capabilities. In the present invention, in terms of materials, graphene and zinc sulfide are used in combination. In terms of structure, graphene particles are bonded by a binder such as phenolic resin to form porous graphene ellipsoids, and the porous graphene ellipsoids are arranged in an orderly manner to form a graphene group. The zinc sulfide nanomaterials are incorporated into the graphene group in various ways. Thus, electromagnetic waves can be converted into heat faster and more efficiently. Moreover, graphene has excellent thermal conductivity, which can achieve rapid heat transfer. Furthermore, the insertion loss of the composite magnetic material in the frequency band of 20 MHz - 1200 MHz reaches about 25 dB, showing excellent wave absorption performance.

[0029] At the same time, the composite magnetic material of the present invention has a matrix composed of multiple porous graphene ellipsoids arranged in an orderly manner to form a graphene group, with zinc sulfide nanomaterials incorporated. It has a dense structure, good toughness, is not prone to fracture failure under load, and has good ductility.

[0030] Moreover, the composite material is coated with an organic insulating material, which can not only endow the composite magnetic material with insulation but also make the combination of the composite material more stable. Optionally, during the coating process, the organic insulating material can partially coat the surface of the composite material or completely coat the composite material. Preferably, the organic insulating material completely coats the composite material. Among them, the organic insulating material is preferably a block polymer, such as an ethylene oxide and propylene oxide block copolymer ether.

[0031] Furthermore, by adding the composite magnetic material to the gasket body, the wave-absorbing rubber gasket still has excellent elasticity and recovery, can adapt to pressure changes and temperature fluctuations, has appropriate softness, can fit well with the contact surface, does not harden at low temperatures, has a small shrinkage amount, good processing performance, does not adhere to the sealing surface, and is convenient for installation and disassembly.

[0032] Therefore, when the wave-absorbing rubber gasket of the present invention is applied to electronic devices, it has excellent sealing effects and electromagnetic shielding performance, can effectively reduce the risk of electromagnetic leakage. In particular, it has a more efficient shielding effect on electromagnetic radiation in the range of 30 MHz - 700 MHz.

[0033] To further optimize the wave absorption performance, elasticity and other properties of the wave-absorbing rubber gasket, the composite magnetic material can be further optimized.

[0034] For example, in the composite magnetic material, when multiple porous graphene ellipsoids are arranged in an orderly manner to form a graphene group, the porous graphene ellipsoids are arranged in a three-dimensional array; and / or, the equatorial radius of the porous graphene ellipsoid is 100 nm - 120 nm, and the polar radius is 200 nm - 250 nm; and / or, the pore size of the porous graphene ellipsoid is 14 nm - 25 nm, and the ratio of the particle size of the zinc sulfide nanomaterial to the pore size of the porous graphene ellipsoid is 1:8 - 1:12.

[0035] Meanwhile, the mass ratio of the porous graphene ellipsoid to the zinc sulfide nanomaterial in the composite magnetic material can be further optimized, and the mass fraction of the composite magnetic material in the wave-absorbing rubber gasket can be optimized. In one embodiment, the mass ratio of the zinc sulfide nanomaterial to the graphene group in the composite magnetic material is 1:3 - 1:5; in one embodiment, the mass fraction of the composite magnetic material in the wave-absorbing rubber gasket is 15% - 20%.

[0036] The present invention does not limit the thickness of the wave-absorbing rubber gasket. Preferably, the wave-absorbing rubber gasket is 1 mm - 5 mm, and can be specifically selected according to the application scenario.

[0037] The present invention also provides a preparation method of a wave-absorbing rubber gasket, including plasticating, mixing, calendering, vulcanizing and forming. Among them, the composite magnetic material is added in the mixing step.

[0038] Specifically, the steps of plasticating include: softening the raw rubber at a temperature of 60°C - 70°C and then cutting and breaking it into small pieces, and then through the mechanical extrusion and frictional force of a plasticator at a temperature of 80°C - 90°C, the long-chain rubber molecules are degraded and shortened, changing from a highly elastic state to a plastic state.

[0039] Among them, according to different sources, the raw rubber can be divided into natural rubber or synthetic rubber. Specifically, the synthetic rubber is selected from at least one of isoprene rubber, styrene-butadiene rubber, cis-butadiene rubber, nitrile rubber, chloroprene rubber, butyl rubber, ethylene-propylene rubber, fluororubber, silicone rubber, polyurethane rubber, acrylate rubber, polysulfide rubber, chlorinated polyethylene rubber, chlorosulfonated polyethylene rubber.

[0040] Specifically, mixing is to mix the plasticated raw rubber, compounding agents and the composite magnetic material, and place them in a rubber mill to make the compounding agents and the composite magnetic material completely and evenly dispersed in the raw rubber through mechanical mixing to obtain a mixed rubber. Among them, the mass fraction of the compounding agents in the mixed rubber is 20% - 35%, and the mass fraction of the composite magnetic material in the mixed rubber is 15% - 20%.

[0041] Among them, compounding agents are mainly classified into anti-aging agents, scorch retarders, reinforcing fillers, softening and plasticizing agents, etc. according to their main functions, and have at least one selected from paraffin, stearic acid or rosin.

[0042] Furthermore, the present invention does not limit the preparation method of the composite magnetic material, and any preparation method can be adopted as long as the structure, materials, etc. meet the above conditions of the present invention to achieve the desired effect.

[0043] In one embodiment, the preparation method of the composite magnetic material includes the following steps: preparing a graphene group by using a colloidal crystal template method, then mixing the graphene group with zinc sulfide nanomaterials, and then adding an organic insulating material, heating to a viscous state and then cooling to obtain the composite magnetic material.

[0044] Among them, the specific steps of preparing a graphene group by using a colloidal crystal template method include: preparing a first formulation by mixing graphene and water, then mixing the first formulation with a binder to form a second formulation, then adding the second formulation into a colloidal crystal template and heating in an inert atmosphere, and then cooling in a reducing atmosphere to obtain the graphene group.

[0045] Among them, the mass ratio of graphene to water is 1:2 - 1:4, the mass ratio of graphene to the binder is 10:1 - 10:3, the binder is preferably a resin binder such as phenolic resin, etc., the mass ratio of graphene to the colloidal crystal is 6:1 - 12:1, the colloidal crystal template is selected from a poly(methyl vinyl acetate) colloidal crystal template, the heating temperature is preferably 180°C - 220°C, the time is preferably 20h - 28h, the inert atmosphere is selected from nitrogen, argon, etc., and the reducing atmosphere is selected from carbon monoxide, hydrogen, etc.

[0046] In order to further improve the stability of graphene, a reducing catalyst such as SnCl2, FeCl2, etc. can also be added to the first formulation. The mass ratio of graphene to the reducing catalyst is 1:1 - 2:1, and then heating in an inert gas and cooling in a reducing atmosphere to obtain a more stable first formulation, where the heating temperature is preferably 220°C - 280°C and the time is preferably 4h - 8h.

[0047] Specifically, calendering refers to pressing the mixed rubber into a film with a certain shape and size through a calender. In one embodiment, the steps of calendering include: forming the mixed rubber on the surface of the fiber material, and then performing calendering. Optionally, the fiber material is dried and impregnated before calendering. Among them, drying can reduce the water content of the fiber material to prevent water evaporation from causing bubbles and increase the temperature of the fiber material to ensure the quality of the calendering process, and impregnation can improve the bonding performance between the fiber material and the mixed rubber.

[0048] Specifically, vulcanization can crosslink the linear molecules of raw rubber in the film into a three-dimensional network structure, thereby transforming the plastic film into a vulcanized rubber with high elasticity. In one embodiment, the steps of vulcanizing the film include: adding the film and a vulcanizing agent into a vulcanizing tank, and then heating to 65°C - 75°C and holding for 1h - 3h.

[0049] Specifically, forming means putting the vulcanized rubber into the hopper of an extruder. Under the extrusion of the screw, by changing the die shape at the outlet of the extruder, the shape during extrusion is changed to obtain an electromagnetic wave absorbing rubber gasket. It can be understood that the vulcanized rubber must be preheated to make it soft before extrusion. Optionally, the preheating temperature is 40°C - 50°C and the time is 0.3h - 0.7h.

[0050] The present invention also provides an application of the electromagnetic wave absorbing rubber gasket in an electronic device, which has excellent sealing effect and electromagnetic shielding performance, can effectively reduce the risk of electromagnetic leakage. In particular, it has a more efficient shielding effect on electromagnetic radiation in the range of 30MHz - 700MHz. Moreover, it has good processing performance, does not adhere to the sealing surface, and is convenient for installation and disassembly.

[0051] Hereinafter, the electromagnetic wave absorbing rubber gasket, its preparation method and its application in an electronic device will be further described through the following specific examples.

[0052] Example 1

[0053] Graphene powder was added to water for mixing at a mass ratio of 1:3, and then SnCl2 was added. The mass ratio of SnCl2 to graphene powder was 1:1, and the mixture was placed in an argon atmosphere and heated at 250°C for 6h, and then cooled in a CO environment to obtain a first formulation. The first formulation and phenolic resin were mixed to obtain a second formulation, wherein the mass ratio of graphene powder to phenolic resin was 10:2.

[0054] The second formulation was added to a polymethyl ethyl acrylate colloidal crystal. The mass ratio of graphene to the polymethyl ethyl acrylate colloidal crystal was 8:1, and then it was placed in an argon atmosphere and heated at 200°C for 24h, and then cooled in a carbon monoxide environment to obtain Figure 1 the graphene group as shown. This graphene group is formed by arranging porous graphene ellipsoids in a three-dimensional array. Among them, the equatorial radius of the porous graphene ellipsoid is 100, the polar radius is 210nm, and the pore diameter is 18nm.

[0055] Add graphene groups and zinc sulfide nanomaterials with a particle size of 1.8 nm to water. Among them, the mass ratio of graphene groups to zinc sulfide nanomaterials is 4:1. Stir and mix, then add ethylene oxide and propylene oxide block copolymer ether, and place it in an argon atmosphere. Heat to a viscous state at 150 °C, and then cool to obtain the composite magnetic material as shown in Figure 2 shown.

[0056] Bake butyl rubber until soft at 65 °C, then cut and break it into small pieces, and then plasticate it through a plasticator at 85 °C. Then mix the plasticated butyl rubber, stearic acid, and the above-obtained composite magnetic material, and place it in a rubber mill for mechanical mixing to obtain a mixed rubber. Among them, the mass fraction of stearic acid in the mixed rubber is 25%, and the mass fraction of the composite magnetic material in the mixed rubber is 15%.

[0057] Dry and impregnate the fibers, then form the mixed rubber on the surface of the fiber material to obtain a film. Then add the film and sulfur to a vulcanizing tank, heat to 70 °C and keep warm for 2 h to obtain a vulcanized rubber. Finally, preheat the vulcanized rubber at 45 °C for 0.5 h and mold it to obtain an absorbing rubber gasket with a thickness of 3 mm.

[0058] Example 2

[0059] Example 2 is carried out with reference to Example 1, the difference being that the mass ratio of graphene groups to zinc sulfide nanomaterials is 5:1.

[0060] Example 3

[0061] Example 3 is carried out with reference to Example 1, the difference being that the mass ratio of graphene groups to zinc sulfide nanomaterials is 3:1.

[0062] Example 4

[0063] Example 4 is carried out with reference to Example 1, the difference being that after the second formulation is added to the polymethyl ethyl acrylate colloidal crystal, it is heated at 180 °C for 24 h. The equatorial radius of the porous graphene ellipsoid is 100 nm, the polar radius is 200 nm, and the pore diameter of the pore channel is 14 nm; in addition, the particle size of the zinc sulfide nanomaterial is 1.7 nm.

[0064] Example 5

[0065] Example 5 is carried out with reference to Example 1, the difference being that after the second formulation is added to the polymethyl ethyl acrylate colloidal crystal, it is heated at 220 °C for 22 h. The equatorial radius of the porous graphene ellipsoid is 110 nm, the polar radius is 210 nm, and the pore diameter of the pore channel is 17 nm; in addition, the particle size of the zinc sulfide nanomaterial is 1.7 nm.

[0066] Example 6

[0067] Example 6 was carried out with reference to Example 1, except that the second formulation was added to the polymethyl ethyl acrylate colloidal crystal and heated at a temperature of 220 °C for 24 h. The equatorial radius of the porous graphene ellipsoid was 120 nm, the polar radius was 220 nm, and the pore diameter of the pore channel was 22 nm. In addition, the particle size of the zinc sulfide nanomaterial was 2 nm.

[0068] Example 7

[0069] Example 7 was carried out with reference to Example 1, except that the mass fraction of the composite magnetic material in the mixed rubber was 18%.

[0070] Example 8

[0071] Example 8 was carried out with reference to Example 1, except that the mass fraction of the composite magnetic material in the mixed rubber was 20%.

[0072] Comparative Example 1

[0073] Comparative Example 1 was carried out with reference to Example 1, except that the composite magnetic material was not added.

[0074] Comparative Example 2

[0075] Comparative Example 2 was carried out with reference to Example 1, except that the second formulation was added to the polymethyl ethyl acrylate colloidal crystal and heated at a temperature of 150 °C for 24 h to obtain a graphene group with a three-dimensional arrangement of spherical graphene.

[0076] Comparative Example 3

[0077] Comparative Example 3 was carried out with reference to Example 1, except that the second formulation was added to the polymethyl ethyl acrylate colloidal crystal and heated at a temperature of 190 °C for 18 h to obtain a graphene group with a three-dimensional arrangement of rod-shaped graphene.

[0078] Comparative Example 4

[0079] Comparative Example 4 was carried out with reference to Example 1, except that carbon nanotubes were used instead of graphene to obtain a carbon nanotube group arranged in a three-dimensional manner of porous carbon nanotube ellipsoids.

[0080] The electromagnetic wave absorption performance and elasticity of the electromagnetic wave absorption rubber gaskets obtained in Test Examples 1-8 and Comparative Examples 1-4 were tested. The test methods are as follows, and the test results are shown in Table 1.

[0081] Electromagnetic wave absorption performance: Refer to "GB / T32596" to test the absorption bandwidth and insertion loss.

[0082] Pressure test: Refer to "GB / T 20029-2005" for the pressure resistance test.

[0083] Table 1

[0084] Absorption bandwidth / GHz Insertion loss / dB Voltage withstand test / MPa Example 1 0.03-1 15-20 2.4 Example 2 0.04-1 16-20 2.4 Example 3 0.03-1 14-19 2.4 Example 4 0.04-1 14-18 2.4 Example 5 0.05-1 15-21 2.4 Example 6 0.1-1.2 13-18 2.4 Example 7 0.03-1 15-22 2.3 Example 8 0.03-1 16-24 2.3 Comparative example 1 0.03-1 2-6 2.5 Comparative example 2 6-14 10-15 2.2 Comparative example 3 6-14 12-16 2.2 Comparative example 4 6-14 10-14 2.2

[0085] Application experiment

[0086] The wave-absorbing rubber gasket obtained in Example 1 was applied to a security camera for electromagnetic compatibility radiation harassment testing. The results are as follows Figure 3 shown. Then, the wave-absorbing rubber gasket obtained in Comparative Example 1 was applied to a security electronic device for electromagnetic compatibility radiation harassment testing. The results are as follows Figure 4 shown. By comparing Figure 3 and Figure 4 it can be seen that using the wave-absorbing rubber gasket of the present invention can effectively reduce the risk of electromagnetic leakage. In particular, it has a more efficient shielding effect on electromagnetic radiation in the range of 30 MHz - 700 MHz.

[0087] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification.

[0088] The above-described embodiments merely represent several implementation manners of the present invention. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. An electromagnetic wave absorbing rubber gasket, characterized in that, The microwave absorbing rubber gasket includes a gasket body and a composite magnetic material distributed in the gasket body, and the mass fraction of the composite magnetic material in the microwave absorbing rubber gasket is 15%-20%; Among them, the composite magnetic material includes a composite material composed of porous graphene ellipsoids and zinc sulfide nanomaterials and an organic insulating material coated on the surface of the composite material. In the composite material, a plurality of the porous graphene ellipsoids are arranged in an orderly manner to form a graphene group. The equatorial radius of the porous graphene ellipsoid is 100nm-120nm, the polar radius is 200nm-250nm, and the pore diameter is 14nm-25nm. The zinc sulfide nanomaterials are fused in the graphene group, and the mass ratio of the zinc sulfide nanomaterials to the graphene group is 1:3-1:

5.

2. The microwave absorbing rubber gasket according to claim 1, wherein The thickness of the microwave absorbing rubber gasket is 1mm-5mm.

3. The absorbing rubber gasket according to claim 1 or 2, characterized in that, In the graphene group, the porous graphene ellipsoids are arranged in a three-dimensional array.

4. The absorbing rubber gasket according to claim 3, characterized in that, The ratio of the particle size of the zinc sulfide nanomaterials to the pore diameter of the porous graphene ellipsoids is 1:8-1:

12.

5. A preparation method of the microwave absorbing rubber gasket according to any one of claims 1-4, comprising plasticating, mixing, calendering, vulcanizing and forming, characterized in that, The composite magnetic material is added in the step of mixing.

6. The preparation method of the wave-absorbing rubber gasket according to claim 5, characterized in that, The preparation method of the composite magnetic material includes the following steps: preparing a graphene group by a colloidal crystal template method, then mixing the graphene group with zinc sulfide nanomaterials, adding an organic insulating material, heating to a viscous state and then cooling to obtain the composite magnetic material; Among them, the step of preparing a graphene group by a colloidal crystal template method includes: preparing a first formulation by mixing graphene and water, then mixing the first formulation with a binder to form a second formulation, adding the second formulation into a colloidal crystal template and heating in an inert atmosphere, and then cooling in a reducing atmosphere to obtain the graphene group.

7. Application of a microwave absorbing rubber gasket according to any one of claims 1-4 in an electronic device.

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