Wave-absorbing impregnated material and method for preparing waterproof wave-absorbing sponge by using wave-absorbing impregnated material
By preparing a waterproof absorbing sponge with an impedance gradient structure and combining it with a sealing layer and a waterproof skin, the problems of appearance defects and deterioration of dielectric properties of traditional absorbing sponges during cutting and in humid environments are solved, and efficient electromagnetic protection is achieved in complex environments.
Patent Information
- Application Number
- CN202510778401.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-11
- Publication Date
- 2025-09-16
AI Technical Summary
Traditional absorbing sponge materials are prone to surface pits or deformation during cutting, and their porous structure easily absorbs water and moisture, resulting in deterioration of dielectric properties, making it difficult to maintain reliability and service life in high-precision and complex environments.
A method for preparing a waterproof absorbing sponge using absorbing impregnated materials is proposed. Through the synergistic effect of the impedance gradient structure, the sealing layer and the waterproof skin, combined with 3D printing technology and the use of specific materials, a waterproof absorbing sponge with adaptability and long-lasting hydrophobic properties is formed.
The environmental stability and service life of the product have been significantly improved. It is suitable for radar protection of outdoor equipment and aircraft at normal temperatures, and solves the problem of balancing the appearance defects of the substrate and waterproof performance.
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Figure CN120648026A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of material preparation, in particular to a wave-absorbing sponge, and in particular to a wave-absorbing impregnated material and a method for preparing a waterproof wave-absorbing sponge using the wave-absorbing impregnated material. Background Art
[0002] In the fields of modern electronic equipment, communication base stations, and military stealth technology, traditional absorbing sponge materials have become key functional materials due to their excellent electromagnetic wave absorption properties. However, this material still has obvious technical defects in practical applications:
[0003] First, defects in the appearance of the substrate: flexible substrates are prone to surface pits or deformations during cutting. Although this does not affect the electromagnetic wave absorption performance, it seriously affects the appearance quality of the product, especially in application scenarios that require precise fitting of complex curved surfaces. Since sponge is a flexible material, it is difficult to cut, and small pits or defects are easily formed on the surface of the substrate during cutting. Second, the porous open structure of the material is prone to water absorption and moisture, which leads to deterioration of its dielectric properties. After absorbing water, the impedance matching characteristics deteriorate, and the stability of the absorbing performance in outdoor or humid environments is significantly reduced. Third, the existing surface waterproof coating technology is subject to the surface state of the substrate. It can neither effectively repair processing defects nor adapt to the dynamic deformation requirements of the material, resulting in difficulty in balancing waterproof performance and deformation adaptability. The above problems seriously restrict the reliability and service life of traditional absorbing materials under high-precision and complex environmental conditions.
[0004] In view of this, the present invention is proposed. Summary of the Invention
[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide an absorbing impregnated material and a method for preparing a waterproof absorbing sponge using the absorbing impregnated material, which can not only adaptively fill the appearance defects of the substrate, but also have long-lasting hydrophobic properties and mechanical elasticity to meet the electromagnetic protection needs in complex environments.
[0006] To achieve the above object, the present invention provides the following technical solutions:
[0007] On the one hand, the present invention provides an absorbing impregnation material, comprising the following components in parts by weight: 10 to 30 parts of textile emulsion, 1 to 10 parts of conductive carbon black, 1 to 10 parts of acetylene black, 66 to 76 parts of pure water, 1 to 3 parts of silane coupling agent, 1 to 2 parts of anti-adhesion agent, 1 to 3 parts of defoaming agent, and 1 to 2 parts of water-based curing agent.
[0008] Specifically, the textile emulsion can be an acrylic emulsion, a polyurethane emulsion, a silicone emulsion, etc.; the conductive carbon black can be a furnace conductive carbon black, the silane coupling agent can be an aminosilane coupling agent, an epoxysilane coupling agent, or a methacryloxysilane coupling agent, and the anti-adhesion agent can be silicon dioxide, talc or diatomaceous earth.
[0009] On the other hand, the present invention also provides a method for preparing a waterproof microwave-absorbing sponge using the microwave-absorbing impregnated material, the specific steps of which are as follows:
[0010] Step 1: First, immerse the absorbing sponge substrate in the absorbing impregnating material described above for 30s to 60s; then place the impregnated absorbing sponge substrate in a drying device for drying to form an absorbing sponge with an impedance gradient structure;
[0011] Step 2: Cutting the absorbing sponge with the impedance gradient structure into the target shape;
[0012] Step 3: Use SOLIDWORKS software to create a three-dimensional model of the absorbing sponge, and use PEEK material through 3D printing technology to make a resin model that matches the target shape;
[0013] Step 4: After polishing the resin model, spray a fluorine-based release agent on its surface;
[0014] Step 5: Spray sealing glue on the resin model to prepare a sealing layer;
[0015] Step 6: After the sealing glue is dried, a waterproof skin is sprayed on the surface of the sealing layer by air spraying, and the waterproof skin is kept at 50° C. to 60° C. for 50 to 60 minutes to dry;
[0016] Step 7: directly peeling off the sealing layer and the waterproof skin on the resin model;
[0017] Step 8: The sealing layer and the waterproof skin are sheathed and bonded onto the absorbing sponge that has been cut into the target shape to complete the preparation of the waterproof absorbing sponge.
[0018] Specifically, in step 1, the drying equipment is an oven, the drying temperature is 70° C. to 80° C., and the drying time is 50 min to 60 min.
[0019] Specifically, in step 2, a nickel-chromium alloy high-temperature resistance wire with a diameter of 0.1 mm is used to cut the absorbing sponge until a target shape is formed. The cutting voltage is 12V to 36V, and the cutting speed is 15mm / s to 20mm / s. During the cutting process, the impedance gradient structure of the absorbing sponge is achieved by adjusting the concentration gradient of the absorbing impregnant. The target shape includes but is not limited to geometric shapes such as rectangle, circle, trapezoid and other special shapes. During the cutting process, the temperature of the resistance wire is maintained at 400°C to 500°C to ensure that the cutting edge is smooth and burr-free.
[0020] Specifically, step 3 specifically includes: first importing the three-dimensional model of the target shape of the absorbing sponge into the SOLIDWORKS software, creating a corresponding resin model, and adjusting the size and geometric features of the resin model through parametric design to ensure that the resin model accurately matches the target shape. After completing the creation and optimization of the resin model, the resin model file is exported to STL format for easy reading by the 3D printer. Then, PEEK material is selected as the raw material for 3D printing, and it is loaded into the feeding system of the 3D printer, and the printing parameters (such as layer thickness, printing speed, printing temperature, etc.) are set. Finally, the 3D printing equipment is started, and a resin model that matches the target shape is gradually printed according to the set parameters. After printing is completed, the resin model is removed from the printing platform, and the surface is post-processed (including grinding and polishing) to ensure that the surface smoothness and dimensional accuracy of the model meet the requirements. The resin model produced by this method can not only accurately reproduce the target shape, but also provide a high-precision mold reference for the subsequent actual manufacturing of the absorbing sponge, greatly improving the manufacturing efficiency and consistency of the product.
[0021] Specifically, in step 4, the release agent can be PTFE (polytetrafluoroethylene), dimethyl silicone oil, paraffin, etc. In principle, as long as it can achieve the demoulding of the later sealing layer and the waterproof skin.
[0022] Specifically, in step 5, the sealing glue is diluted with water, and the mass proportion of water in the diluted mixed glue liquid is 10% to 30%, and a spray gun with an aperture ≥1.8mm is used for multiple spraying; by controlling the dilution ratio and spraying parameters of the sealing glue, a sealing layer with excellent air tightness and thermal stability can be prepared, and the waterproof performance of the absorbing material can be increased.
[0023] Specifically, in step 6, the waterproof skin includes the following components in parts by weight: 80-90 parts of varnish, 5-10 parts of curing agent and 5-10 parts of color paste.
[0024] Specifically, the varnish is water-based varnish, the curing agent is an acrylic emulsion curing agent (such as carbodiimide), a polyurethane emulsion curing agent (such as isocyanate) or a silicone emulsion curing agent (such as organotin), and the color paste is a water-based color paste.
[0025] Specifically, in step 8, before assembly, acrylic elastomer glue is applied to the outer surface of the absorbing sponge and the inner surface of the waterproof skin, and the sealing layer and the waterproof skin are bonded to the absorbing sponge to complete the preparation of the waterproof absorbing sponge.
[0026] Furthermore, the coating thickness of the acrylic elastomer glue is 1 mm to 2 mm.
[0027] In addition, the present invention also provides a waterproof absorbing sponge prepared by the method described in part or in whole above, wherein the radar frequency of the waterproof absorbing sponge is 2 to 18 GHz, and the average vertical radar reflectivity is less than -15 dB; when the waterproof absorbing sponge is immersed in water at room temperature (about 25°C) for 10 seconds and then taken out and the surface is dried, the unit volume mass increases by less than 20%.
[0028] Finally, the present invention also provides the application of the waterproof and absorbing sponge prepared by the method described above in the fields of outdoor equipment radar protection, normal temperature aircraft radar protection, etc.
[0029] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:
[0030] 1) The absorbing impregnating material provided by the present invention optimizes and improves the component formula. After the impregnation is completed, the impregnation liquid will flow from top to bottom during the drying and curing process, and finally an absorbing sponge with an impedance gradient structure is obtained. It has good radar wave absorption ability and can prevent radar detection.
[0031] 2) Using the waterproof absorbing sponge produced by the present invention, a resin model is 3D printed, a sealing layer is formed on the resin model, and a waterproof coating is then formed as a whole. The sealing layer and waterproof skin are then sheathed and bonded to the absorbing sponge. This eliminates minor defects caused by cutting the resistance wire, resulting in a smooth and aesthetically pleasing product appearance. Through the synergistic effect of the sealing layer and the waterproof skin, the present invention significantly improves the environmental stability of the product while maintaining its absorbing performance. It is particularly suitable for radar stealth protection applications such as outdoor equipment radar protection and normal temperature aircraft radar protection.
[0032] 3) The waterproof and absorbing sponge prepared by the present invention makes up for the appearance defects of the substrate, improves the waterproof ability of the polyurethane sponge, reduces the problem of dielectric performance deterioration caused by water absorption and moisture, which ultimately affects impedance matching and absorbing stability, and increases the service life in outdoor or humid environments. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] The accompanying drawings are incorporated in and constitute a part of this specification and, together with the description, serve to explain the principles of the invention.
[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
[0035] Figure 1 A schematic structural diagram of the waterproof wave-absorbing sponge provided by the present invention;
[0036] Figure 2 This is a flow chart of a method for preparing a waterproof microwave-absorbing sponge using a microwave-absorbing impregnating material provided by the present invention.
[0037] Among them: 1. Absorbent sponge substrate with defects; 2. Acrylic elastomer glue; 3. Sealing layer; 4. Waterproof skin. DETAILED DESCRIPTION
[0038] Here, exemplary embodiments will be described in detail, and the embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are only examples consistent with some aspects of the present invention described in detail in the appended claims.
[0039] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.
[0040] Example 1
[0041] See also Figure 1 This embodiment provides a method for preparing a waterproof absorbing sponge using an absorbing impregnated material, and the specific steps are as follows:
[0042] Step 1: Immerse the absorbing sponge substrate in the absorbing impregnating material for 30 seconds. After the impregnation, place it in an oven and dry it at 70°C for 60 minutes. During the drying and curing process, the impregnating liquid will flow from top to bottom, thereby obtaining an absorbing sponge with an impedance gradient structure. The preparation method of the absorbing impregnating material is as follows:
[0043] Add 10 parts of textile emulsion, 66 parts of pure water, 2 parts of anti-adhesion additive, 3 parts of defoaming agent, 1 part of silane coupling agent, 3 parts of acetylene black, and 3 parts of conductive carbon black in order. After adding the conductive carbon black, the speed is 800r / min and stirred for 30 minutes. Finally, add 2 parts of water-based curing agent and stir for 5 minutes.
[0044] Step 2: Use a high-temperature resistance wire to cut the absorbing sponge into a target shape; wherein the high-temperature resistance wire is made of nickel-chromium alloy with a diameter of 0.1 mm, the cutting voltage is 12 V, and the cutting speed is 15 mm / s.
[0045] Step 3: Use SOLIDWORKS software to perform three-dimensional modeling on the required special-shaped absorbing sponge structure, and use 3D printing technology to print out a resin model that matches the target shape, ensuring that the surface of the resin model is smooth. To ensure the weather resistance and strength of the model, the resin is printed using PEEK additive manufacturing.
[0046] Step 4: Polish the resin model, and then spray a layer of PTFE (polytetrafluoroethylene) release agent on the surface of the resin model after polishing.
[0047] Step 5. Spray sealing glue on the resin model to prepare a sealing layer; dilute the sealing glue with water, and the mass proportion of water in the diluted mixed glue is 10%, and use a special spray gun with an aperture ≥1.8mm for spraying, and control the air pressure at 0.5MPa~0.6MPa. Depending on the surface molding of the sample, spray multiple times. In particular: during the spraying process, strive for uniformity and no sagging; after the first spraying is completed, pits and unevenness may appear on the surface, and the surface unevenness can be eliminated by spraying multiple times. After spraying, let the sample dry naturally in the shade to avoid cracking on the surface.
[0048] Step 6: After the sealing adhesive has dried, apply a waterproof coating to the surface of the sealing layer using an air spray process. The coating is then kept at 50°C for 60 minutes to dry. The waterproof coating comprises the following components by weight: 80 parts varnish, 10 parts curing agent, and 10 parts color paste. The same color paste is used for all samples from the same batch (to prevent color variations). Any foreign matter on the paint surface should be promptly cleaned.
[0049] Step 7: directly peel off the sealing layer and the waterproof skin on the resin model.
[0050] Step 8: Fit the sealing layer and waterproof skin onto the absorbing sponge that has been cut into the target shape and bond them together. Specifically: Before fitting, first apply acrylic elastomer glue to the outer surface of the absorbing sponge and the inner surface of the waterproof skin, with a thickness of 1mm; then bond the sealing layer and waterproof skin to the absorbing sponge to obtain the waterproof absorbing sponge (I). See the structural diagram for details. Figure 2 .
[0051] Example 2
[0052] This embodiment provides a method for preparing a waterproof microwave-absorbing sponge using a microwave-absorbing impregnated material, and the specific steps are as follows:
[0053] Step 1: Immerse the absorbing sponge substrate in the absorbing impregnating material for 50 seconds. After the impregnation, place it in an oven and dry it at 80°C for 50 minutes. During the drying and curing process, the impregnating liquid will flow from top to bottom, thereby obtaining an absorbing sponge with an impedance gradient structure. The preparation method of the absorbing impregnating material is as follows:
[0054] Add 30 parts of textile emulsion, 76 parts of pure water, 1 part of anti-adhesion additive, 1 part of defoaming agent, 3 parts of silane coupling agent, 1 part of acetylene black, and 1 part of conductive carbon black in order. After adding the conductive carbon black, the speed is 800r / min and stirred for 30 minutes. Finally, add 2 parts of water-based curing agent and stir for 5 minutes.
[0055] Step 2: Cut the absorbing sponge into the target shape using a high-temperature resistance wire; wherein the high-temperature resistance wire is made of nickel-chromium alloy with a diameter of 0.1 mm, the cutting voltage is 12 V, and the cutting speed is 20 mm / s.
[0056] Step 3: Use SOLIDWORKS software to perform three-dimensional modeling on the required special-shaped absorbing sponge structure, and use 3D printing technology to print out a resin model that matches the target shape, ensuring that the surface of the resin model is smooth. To ensure the weather resistance and strength of the model, the resin is printed using PEEK additive manufacturing.
[0057] Step 4: Polish the resin model. After polishing, spray a layer of release agent on the surface of the resin model. The release agent here is dimethyl silicone oil.
[0058] Step 5. Spray sealing glue on the resin model to prepare a sealing layer; dilute the sealing glue with water, and the mass proportion of water in the diluted mixed glue is 30%, and use a special spray gun with an aperture ≥1.8mm for spraying, and control the air pressure at 0.5MPa~0.6MPa. Depending on the surface molding of the sample, spray multiple times. In particular: during the spraying process, strive for uniformity and no sagging; after the first spraying is completed, pits and unevenness may appear on the surface, and the surface unevenness can be eliminated by spraying multiple times. After spraying, let the sample dry naturally in the shade to avoid cracking on the surface.
[0059] Step 6: After the sealing adhesive has dried, apply a waterproof coating to the surface of the sealing layer using an air spray process. The coating is then kept at 60°C for 50 minutes to dry. The waterproof coating comprises the following components by weight: 90 parts varnish, 5 parts curing agent, and 5 parts color paste. The same color paste is used for all samples from the same batch to prevent color variations. Any foreign matter on the paint surface should be promptly cleaned.
[0060] Step 7: directly peel off the sealing layer and the waterproof skin on the resin model.
[0061] Step 8: The sealing layer and waterproof skin are placed on and bonded to the absorbing sponge that has been cut to the target shape. Specifically, before placing the sealing layer and waterproof skin, an acrylic elastomer adhesive is applied to the outer surface of the absorbing sponge and the inner surface of the waterproof skin to a thickness of 2 mm. The sealing layer and waterproof skin are then bonded to the absorbing sponge to produce the waterproof absorbing sponge (II).
[0062] Example 3
[0063] This embodiment provides a method for preparing a waterproof microwave-absorbing sponge using a microwave-absorbing impregnated material, and the specific steps are as follows:
[0064] Step 1: Immerse the absorbing sponge substrate in the absorbing impregnating material for 50 seconds. After the impregnation, place it in an oven and dry it at 75°C for 55 minutes. During the drying and curing process, the impregnating liquid will flow from top to bottom, thereby obtaining an absorbing sponge with an impedance gradient structure. The preparation method of the absorbing impregnating material is as follows:
[0065] Add 20 parts of textile emulsion, 70 parts of pure water, 2 parts of anti-adhesion additive, 2 parts of defoaming agent, 2 parts of silane coupling agent, 10 parts of acetylene black, and 10 parts of conductive carbon black in order. After adding the conductive carbon black, the speed is 800r / min and stirred for 30 minutes. Finally, add 1 part of water-based curing agent and stir for 5 minutes.
[0066] Step 2: Use a high-temperature resistance wire to cut the absorbing sponge into a target shape; wherein the high-temperature resistance wire is made of nickel-chromium alloy with a diameter of 0.1 mm, the cutting voltage is 12 V, and the cutting speed is 18 mm / s.
[0067] Step 3: Use SOLIDWORKS software to perform three-dimensional modeling on the required special-shaped absorbing sponge structure, and use 3D printing technology to print out a resin model that matches the target shape, ensuring that the surface of the resin model is smooth. To ensure the weather resistance and strength of the model, the resin is printed using PEEK additive manufacturing.
[0068] Step 4: Polish the resin model. After polishing, spray a layer of release agent on the surface of the resin model. The release agent here is paraffin wax or the like.
[0069] Step 5. Spray sealing glue on the resin model to prepare a sealing layer; dilute the sealing glue with water, and the mass proportion of water in the diluted mixed glue is 20%, and use a special spray gun with an aperture ≥1.8mm for spraying, and control the air pressure at 0.5MPa~0.6MPa. Depending on the surface molding of the sample, spray multiple times. In particular: during the spraying process, strive for uniformity and no sagging; after the first spraying is completed, pits and unevenness may appear on the surface, and the surface unevenness can be eliminated by spraying multiple times. After spraying, let the sample dry naturally in the shade to avoid cracking on the surface.
[0070] Step 6: After the sealing adhesive has dried, apply a waterproof coating to the surface of the sealing layer using an air spray process. The coating is then kept at 55°C for 55 minutes to dry. The waterproof coating comprises the following components by weight: 85 parts varnish, 8 parts curing agent, and 8 parts color paste. The same color paste is used for all samples from the same batch to prevent color variations. Any foreign matter on the paint surface should be promptly cleaned.
[0071] Step 7: directly peel off the sealing layer and the waterproof skin on the resin model.
[0072] Step 8: The sealing layer and waterproof skin are placed on and bonded to the absorbing sponge that has been cut to the target shape. Specifically, before placing the sealing layer and waterproof skin, acrylic elastomer glue is applied to the outer surface of the absorbing sponge and the inner surface of the waterproof skin to a thickness of 1.5 mm. The sealing layer and waterproof skin are then bonded to the absorbing sponge to produce the waterproof absorbing sponge (III).
[0073] In order to further verify the effectiveness of the technical solution provided by the present invention, relevant performance tests were carried out on the waterproof absorbing sponge prepared by the present invention and the traditional absorbing sponge, wherein the size of the absorbing sponge is 500mm×500mm×20mm. The test results are shown in Table 1 below.
[0074] Table 1 Test data of the waterproof wave-absorbing sponge prepared by the present invention and the traditional wave-absorbing sponge
[0075]
[0076]
[0077] Test data shows that the waterproof absorbing sponge prepared in the embodiments of the present invention has an average reflection loss of ≤-15dB in the standard radar band of 8-12GHz. Conventional absorbing sponges increase in weight by more than five times after immersion in water, rendering them unusable. However, the waterproof absorbing sponge increases in weight by approximately 7% to 15% after immersion in water, with little impact on performance. Therefore, the absorbing sponge prepared in the present invention solves the problems of absorbing sponges being waterproof and uneven surfaces caused by minor defects when cutting flexible absorbing sponges. It is widely applicable to stealth applications in harsh working conditions, such as radar protection for outdoor equipment and radar protection for aircraft at room temperature.
[0078] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention.
[0079] It should be understood that the present invention is not limited to the above description and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.
Claims
1. A microwave absorbing impregnating material, characterized in that: The invention comprises the following components in parts by weight: 10 to 30 parts of textile emulsion, 1 to 10 parts of conductive carbon black, 1 to 10 parts of acetylene carbon black, 66 to 76 parts of purified water, 1 to 3 parts of silane coupling agent, 1 to 2 parts of anti-adhesion auxiliary agent, 1 to 3 parts of defoaming agent and 1 to 2 parts of water-based curing agent.
2. A method for preparing a waterproof microwave-absorbing sponge using a microwave-absorbing impregnated material, characterized in that: The specific steps are as follows: Step 1: First, immerse the absorbing sponge substrate in the absorbing impregnating material according to claim 1 for 30 seconds to 60 seconds; place the impregnated absorbing sponge substrate in a drying device for drying to form an absorbing sponge with an impedance gradient structure; Step 2: Cutting the absorbing sponge with the impedance gradient structure into the target shape; Step 3: Use SOLIDWORKS software to create a three-dimensional model of the absorbing sponge, and use PEEK material through 3D printing technology to make a resin model that matches the target shape; Step 4: After polishing the resin model, spray a fluorine-based release agent on its surface; Step 5: Spray sealing glue on the resin model to prepare a sealing layer; Step 6: After the sealing glue is dried, a waterproof skin is sprayed on the surface of the sealing layer by air spraying, and the waterproof skin is kept at 50° C. to 60° C. for 50 to 60 minutes to dry; Step 7: directly peeling off the sealing layer and the waterproof skin on the resin model; Step 8: The sealing layer and the waterproof skin are sheathed and bonded onto the absorbing sponge that has been cut into the target shape to complete the preparation of the waterproof absorbing sponge.
3. The method for preparing a waterproof microwave-absorbing sponge using a microwave-absorbing impregnated material according to claim 2, characterized in that: In step 1, the drying equipment is an oven, the drying temperature is 70° C. to 80° C., and the drying time is 50 min to 60 min.
4. The method for preparing a waterproof wave-absorbing sponge using a wave-absorbing impregnated material according to claim 2, characterized in that: In step 2, the absorbing sponge is cut by using a high-temperature resistance wire, the cutting voltage is 12V to 36V, and the cutting speed is 15mm / s to 20mm / s.
5. The method for preparing a waterproof microwave-absorbing sponge using a microwave-absorbing impregnated material according to claim 2, characterized in that: In step 5, the sealing glue is diluted with water, and the mass proportion of water in the diluted mixed glue solution is 10% to 30%, and a spray gun with an aperture of ≥1.8 mm is used for multiple spraying.
6. The method for preparing a waterproof microwave-absorbing sponge using a microwave-absorbing impregnated material according to claim 2, characterized in that: In step 6, the waterproof skin includes the following components in parts by weight: 80-90 parts of varnish, 5-10 parts of curing agent and 5-10 parts of color paste.
7. The method for preparing a waterproof microwave-absorbing sponge using a microwave-absorbing impregnated material according to claim 2, characterized in that: It is characterized by: In step 8, before assembly, acrylic elastomer glue is applied to the outer surface of the absorbing sponge and the inner surface of the waterproof skin respectively, and the sealing layer and the waterproof skin are bonded to the absorbing sponge to complete the preparation of the waterproof absorbing sponge.
8. The method for preparing a waterproof microwave-absorbing sponge using a microwave-absorbing impregnated material according to claim 7, characterized in that: It is characterized by: The coating thickness of the acrylic elastomer glue is 1 mm to 2 mm.
9. A waterproof wave-absorbing sponge prepared by the method according to any one of claims 1 to 8, characterized in that: The radar frequency of the waterproof absorbing sponge is 2 to 18 GHz, and the average value of the vertical radar reflectivity is less than -15 dB.
10. Use of the waterproof and absorbing sponge prepared by the method according to any one of claims 1 to 8 in the field of radar protection.