A graphene derivative-based X-band wave-absorbing honeycomb composite layer structure, a composite material and a preparation method and application thereof

Abstract

The application discloses a kind of X waveband wave-absorbing honeycomb composite layer structures based on graphene derivative, composite material and preparation method and application thereof, method steps include: honeycomb material processing: cutting and washing to honeycomb material;Configuration wave-absorbing slurry: configuration graphene derivative wave-absorbing slurry, and stirring and sanding are carried out;Two times of impregnation: aramid paper honeycomb sheet is impregnated into graphene derivative wave-absorbing slurry, then drying is carried out, and two times of impregnation are carried out;Surface bonding treatment: glass fibre and / or epoxy resin skin are bonded on the upper surface of honeycomb sheet, and conductive carbon fibre and / or epoxy resin skin are bonded on the lower surface of honeycomb sheet.The application can realize the strong absorption (RL<-15dB) characteristics of X waveband electromagnetic wave under thin thickness (8mm), and the material has good structural strength and environmental adaptability, and the preparation method is simple, the cost is moderate, and is suitable for large-scale industrial production.

Description

Technical Field

[0001] This invention relates to a composite layer structure, a composite material, its preparation method and application, and particularly to an X-band absorbing honeycomb composite layer structure based on graphene derivatives, a composite material, its preparation method and application. Background Technology

[0002] With the increasing complexity of the electromagnetic environment on modern battlefields, broadband and high stealth capabilities have gradually become key factors in effectively enhancing the survivability and penetration capabilities of friendly military targets. Based on stealth design, the application of radar-absorbing materials has become an important condition for achieving high stealth capabilities. On the other hand, in recent years, the development of lightweight, multifunctional composite radar-absorbing materials has received increasing attention. For example, drones, cruise missiles, radar vehicles, and large surface ships require strict control over the reflection of X-band radar waves. Therefore, the development of thin, wide-band, and lightweight strong-absorbing composite radar-absorbing materials for X-band electromagnetic waves has become one of the current research hotspots.

[0003] Existing carbon-based microwave absorbing materials mainly use conductive graphite and carbon black as absorbing agents. They often require a high degree of filling to form a conductive network, which is not conducive to the development of lightweight microwave absorbing materials and can no longer meet people's requirements. They urgently need to be improved. Summary of the Invention

[0004] The purpose of this invention is to provide an X-band absorbing honeycomb composite layer structure based on graphene derivatives, the composite material, its preparation method and application, thereby overcoming the shortcomings of the existing technology.

[0005] This invention provides the following solution:

[0006] A method for preparing an X-band absorbing honeycomb composite material based on graphene derivatives, comprising:

[0007] Honeycomb material processing: The honeycomb material is cut and washed with water;

[0008] Preparation of microwave absorbing slurry: Prepare graphene derivative microwave absorbing slurry, and stir and grind it;

[0009] First impregnation: The aramid paper honeycomb sheet is impregnated in a graphene derivative microwave absorbing slurry and then dried;

[0010] Second impregnation: After drying, the aramid paper honeycomb sheet is impregnated in a graphene derivative microwave absorbing slurry and dried again to obtain the honeycomb sheet;

[0011] Surface bonding treatment: Fiberglass and / or epoxy resin skin is bonded to the upper surface of the honeycomb sheet, and conductive carbon fiber and / or epoxy resin skin is bonded to the lower surface of the honeycomb sheet.

[0012] Furthermore, the cutting and washing of the honeycomb material further includes: cutting the honeycomb material into sheets and washing it with water to remove residual debris and grease from the surface of the honeycomb material.

[0013] Furthermore, in the microwave absorbing slurry preparation step, the graphene derivative microwave absorbing slurry comprises the following components by mass: 420 parts water, 10 parts dispersant N, 36 parts acetylene black, 5 parts graphene derivative, 41 parts decabromodiphenyl ethane, 14 parts antimony trioxide, 74 parts acrylic emulsion, and 1 part defoamer.

[0014] Further:

[0015] In the first immersion, after immersion for 5 minutes, remove and weigh, and dry for no less than 30 minutes;

[0016] In the second impregnation, after impregnation for 5 minutes, remove and weigh, and dry for no less than 30 minutes.

[0017] Furthermore, a forced-air drying oven is used for drying, with the temperature of the forced-air drying oven controlled at 80±5℃.

[0018] Furthermore, the dry weight gain of the microwave absorbing sheet after the first impregnation was 9 ± 0.5 wt.%, and the dry weight gain of the microwave absorbing sheet after the second impregnation was 15 ± 0.5 wt.%.

[0019] An X-band absorbing honeycomb composite material based on graphene derivatives is prepared using the aforementioned preparation method.

[0020] An X-band absorbing honeycomb composite layer structure based on graphene derivatives is disclosed. The composite layer structure comprises, from bottom to top: a conductive carbon fiber / epoxy resin bottom reflective layer, a graphene derivative-based absorbing honeycomb intermediate layer, and a glass fiber / epoxy resin upper surface wave-transparent layer. The graphene derivative-based absorbing honeycomb intermediate layer includes the aforementioned graphene derivative-based X-band absorbing honeycomb composite material.

[0021] Furthermore, the characteristic impedance of the X-band absorbing honeycomb composite layer structure based on graphene derivatives gradually increases from bottom to top.

[0022] Application of a graphene derivative in the preparation of microwave absorbing honeycomb composite materials.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] This invention enables strong absorption (RL < -15dB) of X-band electromagnetic waves in a thin thickness (8mm), while the material has good structural strength and environmental adaptability. The preparation method is simple, cost-effective, and suitable for large-scale industrial production. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a flowchart of a method for preparing X-band absorbing honeycomb absorbing materials based on graphene derivatives.

[0027] Figure 2 This is a schematic diagram of a composite layer structure of X-band absorbing honeycomb absorbing material based on graphene derivatives.

[0028] Figure 3 This is a reflectivity curve of an X-band radar-absorbing honeycomb sandwich panel based on graphene derivatives. Detailed Implementation

[0029] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0030] Example 1:

[0031] A method for preparing an X-band absorbing honeycomb sandwich composite material based on graphene derivatives includes the following steps:

[0032] Step 1: Dissolve 60.8g of acetylene black in 703g of industrial water and mechanically stir until uniformly dispersed; then add 8g of graphene derivative to the mixture and mechanically stir until uniformly dispersed; subsequently, weigh 14.8g of dispersant N, 68g of decabromodiphenyl ethane, 22.8g of antimony trioxide, and 0.5g of defoamer into the mixture one by one and mechanically stir for 30 minutes; then transfer the mixture to a sand mill, set the speed to 2850 rpm, and mechanically stir for 30 minutes to obtain a uniformly dispersed graphene derivative microwave absorbing slurry;

[0033] Step 2: Cut square honeycomb sheets with length, width, and height of 200mm, 200mm, and 8mm respectively using a linear cutting method. Then, wash the honeycomb sheets multiple times and dry them.

[0034] Step 3: Immerse the standard honeycomb sheet in the prepared graphene derivative absorbing slurry, shake for 5 minutes, remove and weigh, then place in a forced-air drying oven for 30 minutes (the first dry weight gain is controlled at 9±0.5wt.%); after drying, immerse the first-impregnated absorbing honeycomb sheet in the graphene derivative absorbing slurry again, shake for 5 minutes again, and place in a forced-air drying oven for drying (the second dry weight gain is controlled at 15±0.5wt.%).

[0035] Step 4: The honeycomb sheet impregnated with graphene derivative absorbing slurry is bonded to the upper surface (the side with low absorbing agent content) using a molding method, with the curing temperature controlled at 150±5℃ and the skin thickness at 0.3mm. Then, conductive carbon fiber / epoxy resin skin is bonded to the lower surface (the side with high absorbing agent content) of the honeycomb sheet, with the curing temperature controlled at 130±5℃ and the skin thickness at 0.3mm. Finally, the honeycomb panel is sealed around the edges by filling with epoxy resin film, thus preparing the final X-band graphene derivative-based absorbing honeycomb sandwich composite material.

[0036] Example 2:

[0037] A method for preparing an X-band absorbing honeycomb sandwich composite material based on graphene derivatives includes the following steps:

[0038] Step 1: Dissolve 60.8g of acetylene black in 703g of industrial water and mechanically stir until uniformly dispersed; then add 8g of graphene derivative to the mixture and mechanically stir until uniformly dispersed; subsequently, weigh 14.8g of dispersant N, 68g of decabromodiphenyl ethane, 22.8g of antimony trioxide, and 0.5g of defoamer into the mixture one by one and mechanically stir for 30 minutes; then transfer the mixture to a sand mill, set the speed to 2850 rpm, and mechanically stir for 30 minutes to obtain a uniformly dispersed graphene derivative microwave absorbing slurry;

[0039] Step 2: Cut square honeycomb sheets with length, width, and height of 200mm, 200mm, and 8mm respectively using a linear cutting method. Then, wash the honeycomb sheets multiple times and dry them.

[0040] Step 3: Immerse the standard honeycomb sheet in the prepared graphene derivative microwave absorbing slurry, shake for 5 minutes, take it out and control the weight (the dry weight gain is controlled to be 15±0.5wt.%), and then place it in a forced-air drying oven to dry for 30 minutes before use.

[0041] Step 4: The honeycomb sheet impregnated with graphene derivative absorbing slurry is bonded to the upper surface (the side with low absorbing agent content) using a molding method, with the curing temperature controlled at 150±℃ and the skin thickness at 0.3mm. Then, conductive carbon fiber / epoxy resin skin is bonded to the lower surface (the side with high absorbing agent content) of the honeycomb sheet, with the curing temperature controlled at 130±5℃ and the skin thickness at 0.3mm. Finally, the honeycomb panel is sealed around the edges by filling with epoxy resin film, thus preparing the final X-band graphene derivative-based absorbing honeycomb sandwich composite material.

[0042] Example 3:

[0043] This embodiment discloses a method for preparing an X-band absorbing honeycomb sandwich composite material based on graphene derivatives, including the following steps:

[0044] Step 1: Dissolve 60.8g of acetylene black in 703g of industrial water and mechanically stir until uniformly dispersed; then add 8g of graphene derivative to the mixture and mechanically stir until uniformly dispersed; subsequently, weigh 14.8g of dispersant N, 68g of decabromodiphenyl ethane, 22.8g of antimony trioxide, and 0.5g of defoamer into the mixture one by one and mechanically stir for 30 minutes; then transfer the mixture to a sand mill, set the speed to 2850 rpm, and mechanically stir for 30 minutes to obtain a uniformly dispersed graphene derivative microwave absorbing slurry;

[0045] Step 2: Cut square honeycomb sheets with length, width, and height of 200mm, 200mm, and 8mm respectively using a linear cutting method. Then, wash the honeycomb sheets multiple times and dry them.

[0046] Step 3: Immerse the standard honeycomb sheet in the prepared graphene derivative absorbing slurry, shake for 5 minutes, remove and weigh, then place in a forced-air drying oven for 30 minutes (the first dry weight gain is controlled at 9±0.5wt.%); after drying, immerse the first-impregnated absorbing honeycomb sheet in the graphene derivative absorbing slurry again, shake for 5 minutes again, and place in a forced-air drying oven for drying (the second dry weight gain is controlled at 15±0.5wt.%).

[0047] Step 4: The honeycomb sheet impregnated with graphene derivative absorbing slurry is bonded with a modified cyanate ester / quartz cloth skin on the upper surface (the side with low absorbing agent content) using a molding method, with the curing temperature controlled at 130±5℃ and the skin thickness at 0.3mm; then, conductive carbon fiber / epoxy resin skin is bonded to the lower surface of the honeycomb sheet (the side with high absorbing agent content), with the curing temperature controlled at 130±5℃ and the skin thickness at 0.3mm; finally, the honeycomb panel is sealed by filling the edges with epoxy resin film, thus preparing the final X-band graphene derivative-based absorbing honeycomb sandwich composite material.

[0048] Example 4:

[0049] like Figure 1 The flowchart shown illustrates the preparation method of X-band absorbing honeycomb absorbing material based on graphene derivatives. This embodiment is a summary of the preparation method based on Embodiments 1, 2, and 3, and in conjunction with other embodiments. The method steps of this embodiment include:

[0050] Step S1, honeycomb material processing: The honeycomb material is cut and washed with water;

[0051] Specifically, the honeycomb material is cut into sheets, for example, into thin sheets with a thickness of 8mm, and residual debris and grease on the surface of the honeycomb material are removed by washing with water.

[0052] Step S2, prepare the microwave absorbing slurry: prepare the graphene derivative microwave absorbing slurry, and stir and mill it; for example, mechanical stirring for 2 hours and milling for 1 hour.

[0053] Specifically, the composition of the graphene derivative microwave absorbing slurry is as follows: 703g water, 14.8g dispersant N, 60.8g acetylene black, 8g graphene derivative, 68g decabromodiphenyl ethane, 22.8g antimony trioxide, 122.4g acrylic emulsion, and 0.5g defoamer;

[0054] Step S3, two immersions:

[0055] First impregnation: The aramid paper honeycomb sheet is impregnated in the graphene derivative microwave absorbing slurry and then dried. The microwave absorbing honeycomb sheet is then transferred to a forced-air drying oven and dried for 30 minutes.

[0056] Second impregnation: After drying, the aramid paper honeycomb sheet is impregnated in graphene derivative microwave absorbing slurry for 5 minutes. After impregnation, it is taken out and weighed, and then dried again. It is then transferred to a forced-air drying oven and dried for 30 minutes before use. The temperature of the forced-air drying oven is controlled at 80±5℃ to obtain the honeycomb sheet.

[0057] In this step, the dry weight gain of the microwave absorbing sheet after the first impregnation was 9 ± 0.5 wt.%, and the dry weight gain of the microwave absorbing sheet after the second impregnation was 15 ± 0.5 wt.%.

[0058] For example, the honeycomb material is selected as meta-aramid paper honeycomb, and the honeycomb density is selected as 48 kg / m³. 3 The aperture was selected as 4.8mm.

[0059] Specifically, a forced-air drying oven is used for drying, and the temperature of the forced-air drying oven is controlled at 80±5℃.

[0060] Definition: Meta-aramid is a high-temperature resistant fiber variety that was developed early, widely used, produced in large quantities, and experienced rapid growth. Also known as poly(m-phenylene isophthalamide), it consists of regularly arranged serrated macromolecules that decompose before melting, with a glass transition temperature (Tg) of 270℃. Below 350℃, it does not undergo significant decomposition or carbonization. When the temperature exceeds 400℃, the fiber gradually becomes brittle, carbonizes, and eventually decomposes, but does not produce molten droplets. It does not propagate flame in a flame and has good flame retardancy, with a limiting oxygen index (LOI) of 29%–32%, exhibiting excellent performance. Its chopped fibers and precipitated fibers are mainly used to make aramid paper, which can be used for insulation in high-temperature motors, transformers, electronic appliances, mobile phone batteries, and laptop batteries. It can also be further processed into honeycomb structure materials for use in aircraft, high-speed trains, and yachts.

[0061] Aramid paper honeycomb is mainly made of aramid paper, core strip adhesive and impregnation resin. Depending on the raw materials of the aramid paper, aramid paper honeycomb can be divided into para-aramid honeycomb and meta-aramid paper honeycomb.

[0062] Step S4, Surface bonding treatment: Glass fiber and / or epoxy resin skin are bonded to the upper surface of the honeycomb sheet by molding, and conductive carbon fiber and / or epoxy resin skin are bonded to the lower surface of the honeycomb sheet by molding.

[0063] In this step, the bonding temperature of the molding method shall not exceed 180℃, the thickness of the glass fiber and / or epoxy resin skin shall be 0.3mm, and the thickness of the conductive carbon fiber and / or epoxy resin skin shall be 0.3mm.

[0064] For the purpose of simplicity, the method steps disclosed in the above embodiments are described as a series of actions. However, those skilled in the art should understand that the embodiments of the present invention are not limited to the described order of actions, because according to the embodiments of the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily essential to the embodiments of the present invention.

[0065] Example 5:

[0066] This embodiment discloses an X-band absorbing honeycomb composite material based on graphene derivatives. This composite material is prepared using the preparation method described in any one of Embodiments 1 to 4. As can be seen from the description of the absorbing honeycomb composite material and its preparation method,

[0067] Developing thin, wide-bandwidth, and lightweight composite absorbing materials for X-band electromagnetic waves has become a current research hotspot. Graphene, as a strategic emerging material of the 21st century, is currently at a critical breakthrough stage in its industrial application. Graphene is composed of sp... 2 Graphene, a special two-dimensional sheet material with a honeycomb lattice structure formed by the close packing of hybrid carbon atoms, possesses excellent optical, mechanical, and electrical properties, showing great promise in the field of electromagnetic wave absorption. Traditional carbon-based absorbing materials mainly use conductive graphite and carbon black as absorbers, often requiring high packing density to form a conductive network, which is not conducive to the lightweight development of absorbing materials. In contrast, graphene, due to its high electrical conductivity, can form a conductive network at extremely low packing density, achieving highly efficient absorption of electromagnetic waves.

[0068] The microwave absorbing material prepared based on graphene can achieve strong absorption of X-band electromagnetic waves (RL < -15dB) with a thin thickness (8mm), while the material has good structural strength and environmental adaptability. The preparation method is simple, cost-effective, and suitable for large-scale industrial production.

[0069] Example 6:

[0070] like Figure 2 As shown, this embodiment prepares a composite layer structure of a graphene derivative-based absorbing honeycomb sandwich panel based on Embodiments 1 to 5 and other embodiments.

[0071] An X-band absorbing honeycomb composite layer structure based on graphene derivatives is disclosed. The composite layer structure comprises, from bottom to top: a conductive carbon fiber / epoxy resin bottom reflective layer 3, a graphene derivative-based absorbing honeycomb intermediate layer 2, and a glass fiber / epoxy resin upper surface wave-transparent layer 1. The graphene derivative-based absorbing honeycomb intermediate layer 2 includes an X-band absorbing honeycomb composite material based on graphene derivatives.

[0072] This embodiment also relates to the application of graphene derivatives in the preparation of microwave absorbing honeycomb composite materials.

[0073] Specifically, the characteristic impedance of the X-band absorbing honeycomb composite layer structure based on graphene derivatives gradually increases from bottom to top.

[0074] The X-band absorbing honeycomb sandwich panel composite material of this embodiment comprises, from bottom to top: a conductive carbon fiber / epoxy resin bottom reflective layer 3, a graphene derivative-based absorbing honeycomb middle layer 2, and a glass fiber / epoxy resin upper surface wave-transparent layer 1. A molding process is used to tightly bond the absorbing honeycomb core to the upper and lower skin layers, forming a sandwich structure. This structure endows the composite material with good structural strength and environmental adaptability. Furthermore, the impedance-gradient absorbing structure, designed based on the theory of gradually increasing characteristic impedance from bottom to top, optimizes the electromagnetic wave absorption performance of the composite material.

[0075] like Figure 3 As shown, Figure 3 This is a reflectivity curve of the X-band radar-absorbing honeycomb sandwich panel based on graphene derivatives from Example 1. As can be seen from the figure, the graphene derivative-based absorbing honeycomb sandwich panel composite material, designed based on the theory of gradually increasing characteristic impedance from bottom to top, has a reflectivity of less than -15dB across the entire X-band (8-12GHz), achieving approximately 97% absorption of electromagnetic waves. Furthermore, the minimum reflectivity value of the graphene derivative-based absorbing honeycomb sandwich panel composite material is less than -20dB (approximately at 9.5GHz), indicating an effective absorption of more than 99% of electromagnetic waves.

[0076] The electromagnetic wave absorption principle of the graphene derivative-based absorbing honeycomb sandwich panel composite material for X-band in this invention is as follows: First, the characteristic impedance of the glass fiber / epoxy resin transparent upper surface, which is close to that of air, ensures that electromagnetic waves can penetrate into the middle layer of the absorbing honeycomb to the maximum extent. The excellent conductivity and loss capability of graphene derivatives endow the material with excellent electromagnetic wave attenuation characteristics, and the multiple scattering and reflection of electromagnetic waves by the honeycomb porous structure further enhances the electromagnetic wave absorption performance of the material. Second, the highly conductive carbon fiber / epoxy resin skin at the bottom can achieve total reflection of electromagnetic waves from the bottom, thereby forming destructive interference with the reflected waves from the upper surface, resulting in the generation of absorption peaks. Therefore, the graphene derivative-based absorbing honeycomb sandwich panel composite material synthesized in this invention exhibits excellent electromagnetic wave absorption performance.

[0077] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art and should not be interpreted in an idealized or overly formal sense unless specifically defined.

[0078] It should be noted that certain terms are used in this specification and claims to refer to specific elements. Those skilled in the art will understand that different manufacturers or producers may use different terms to refer to the same element. This specification and claims do not distinguish elements based on differences in terminology, but rather on differences in function.

[0079] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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, they should be considered to be within the scope of this specification.

[0080] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features but not others included in other embodiments, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, any of the embodiments claimed in the claims can be used in any combination of embodiments of the invention.

[0081] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0082] In this application, the term "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be made without using these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0083] 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 or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing an X-band absorbing honeycomb composite material based on graphene derivatives, characterized in that, include: Honeycomb material processing: The honeycomb material is cut and washed with water; Preparation of microwave absorbing slurry: Prepare graphene derivative microwave absorbing slurry, and stir and grind it; First impregnation: The aramid paper honeycomb sheet is impregnated in a graphene derivative microwave absorbing slurry and then dried; Second impregnation: After drying, the aramid paper honeycomb sheet is impregnated in a graphene derivative microwave absorbing slurry and dried again to obtain the honeycomb sheet; Surface bonding treatment: Fiberglass and / or epoxy resin skin are bonded to the upper surface of the honeycomb sheet, and conductive carbon fiber and / or epoxy resin skin are bonded to the lower surface of the honeycomb sheet. In the microwave absorbing slurry preparation step, the graphene derivative microwave absorbing slurry is composed of the following components by mass: 420 parts water, 10 parts dispersant N, 36 parts acetylene black, 5 parts graphene derivative, 41 parts decabromodiphenyl ethane, 14 parts antimony trioxide, 74 parts acrylic emulsion, and 1 part defoamer.

2. The method for preparing X-band absorbing honeycomb composite material based on graphene derivatives according to claim 1, characterized in that, The cutting and washing of the honeycomb material further includes: cutting the honeycomb material into sheets and washing it with water to remove residual debris and grease from the surface of the honeycomb material.

3. The method for preparing X-band absorbing honeycomb composite material based on graphene derivatives according to claim 1, characterized in that: In the first immersion, after immersion for 5 minutes, remove and weigh, and dry for no less than 30 minutes; In the second impregnation, after impregnation for 5 minutes, remove and weigh, and dry for no less than 30 minutes.

4. The method for preparing X-band absorbing honeycomb composite material based on graphene derivatives according to claim 3, characterized in that, Drying is performed using a forced-air drying oven, with the temperature controlled at [temperature value missing]. .

5. The method for preparing X-band absorbing honeycomb composite material based on graphene derivatives according to claim 3, characterized in that, The dry weight gain of the microwave absorbing sheet after the first impregnation was The dry weight gain of the microwave absorbing sheet after the second impregnation was .

6. An X-band absorbing honeycomb composite material based on graphene derivatives, characterized in that, It is prepared by any one of the preparation methods according to claims 1 to 5.

7. A graphene derivative-based X-band absorbing honeycomb composite layer structure, characterized in that, The composite layer structure comprises, from bottom to top: a conductive carbon fiber / epoxy resin bottom reflective layer, a graphene derivative-based absorbing honeycomb intermediate layer, and a glass fiber / epoxy resin upper surface wave-transparent layer, wherein the graphene derivative-based absorbing honeycomb intermediate layer includes the X-band absorbing honeycomb composite material based on graphene derivatives as described in claim 6.

8. The X-band absorbing honeycomb composite layer structure based on graphene derivatives according to claim 7, characterized in that, The characteristic impedance of the X-band absorbing honeycomb composite layer structure based on graphene derivatives gradually increases from bottom to top.

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