Wave-absorbing material with ultra-long elongation and preparation method thereof
By designing a fish-scale structure and employing a shear-magnetic field synergistic orientation treatment in the microwave absorbing material, the problems of poor toughness and low elongation in the microwave absorbing material are solved, achieving high elongation and excellent low-frequency microwave absorption performance, making it suitable for complex curved surfaces and repeated deformation applications.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-24
- Publication Date
- 2026-04-10
AI Technical Summary
Existing microwave absorbing materials have poor toughness and low elongation, making it difficult to avoid cracking when bending or fitting curved surfaces. Furthermore, high magnetic powder content affects the material's flexibility and processability.
The microwave absorbing layer and release material layer are stacked. The surface of the microwave absorbing layer is designed with a fish scale structure, which includes iron-silicon-aluminum alloy magnetic powder, modifier, wetting agent and titanate coupling agent. The fish scale arrangement is formed by shear-magnetic field synergistic orientation treatment. Polyvinyl alcohol and plasticizer are combined to improve toughness and processability.
It significantly improves the elongation and low-frequency absorption performance of the absorbing material, making it suitable for conforming to complex curved surfaces and environments subject to repeated deformation, while maintaining excellent electromagnetic wave absorption performance.
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Figure CN121840205A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electromagnetic wave absorbing materials technology, and in particular to an absorbing material with ultra-long elongation and its preparation method. Background Technology
[0002] Microwave absorbing materials are widely used in electronics, automotive, aerospace, medical, and machinery manufacturing industries due to their excellent electromagnetic absorption and attenuation effects. However, in the manufacturing process of some electronic products, microwave absorbing materials require sufficient toughness, but existing materials have significant drawbacks: 1. Poor toughness and low elongation. For example, traditional magnetic powder-filled microwave absorbing materials (such as ferrite / carbonyl iron powder dispersed in epoxy resin, rubber, etc.) generally have an elongation of less than 50%, and are prone to cracking when bent, stretched or bonded to curved surfaces; while rigid substrates such as epoxy resin are prone to stress whitening and brittle fracture after bending. 2. Balance between processability and performance: High magnetic powder content is the key to achieving good wave absorption performance, but it will seriously impair the flexibility and processability of the material.
[0003] Therefore, there is an urgent need to provide a new type of microwave absorbing material that combines extraordinary elongation (>200%), excellent low-frequency microwave absorption performance (1MHz-1GHz), and good processing plasticity to solve the above problems. Summary of the Invention
[0004] The purpose of this application is to provide a microwave absorbing material with ultra-long elongation and its preparation method to solve the above-mentioned problems.
[0005] To achieve the above objectives, the first aspect of this application provides a microwave absorbing material with ultra-long elongation, comprising a microwave absorbing layer and a release material layer stacked together, wherein the surface of the microwave absorbing layer away from the release material layer comprises a fish scale structure. The absorbing layer comprises component A and component B; the raw materials of component A include iron-silicon-aluminum alloy magnetic powder, modifier, first wetting agent, and titanate coupling agent; the raw materials of component B include polyvinyl alcohol, plasticizer, crosslinking agent, and second wetting agent. The release material layer includes a PET release film.
[0006] Optionally, the modifier includes a silane coupling agent; And / or, the first wetting agent and the second wetting agent each independently comprise polyether-modified silicone oil; And / or, the plasticizer includes dioctyl phthalate and / or environmentally friendly alternative plasticizers; And / or, the crosslinking agent includes borax; And / or, the iron-silicon-aluminum alloy magnetic powder has a particle size of 15-90μm, an aspect ratio ≥8, and a shape including flakes.
[0007] Optionally, the mass ratio of component A to component B is 50-80:20-50; And / or, the iron-silicon-aluminum alloy magnetic powder accounts for 50-60% of the total mass of the absorbing layer.
[0008] Optionally, the mass of the modifier is 0.3-0.8% of the mass of the iron-silicon-aluminum alloy magnetic powder; And / or, the mass of the first wetting agent is 0.1-0.3% of the mass of the iron-silicon-aluminum alloy magnetic powder; And / or, the mass of the titanate coupling agent is 0.1-0.3% of the mass of the iron-silicon-aluminum alloy magnetic powder; And / or, the mass of the plasticizer is 20-30% of the mass of the polyvinyl alcohol; And / or, the mass of the crosslinking agent is 2-4% of the mass of the polyvinyl alcohol; And / or, the mass of the second wetting agent is 10-14% of the mass of the polyvinyl alcohol.
[0009] Optionally, the mass of the modifier is 0.5% of the mass of the iron-silicon-aluminum alloy magnetic powder; And / or, the mass of the first wetting agent is 0.2% of the mass of the iron-silicon-aluminum alloy magnetic powder; And / or, the mass of the titanate coupling agent is 0.2% of the mass of the iron-silicon-aluminum alloy magnetic powder; And / or, the mass of the plasticizer is 25% of the mass of the polyvinyl alcohol; And / or, the mass of the crosslinking agent is 3% of the mass of the polyvinyl alcohol; And / or, the mass of the second wetting agent is 12% of the mass of the polyvinyl alcohol.
[0010] Optionally, the basic unit of the fish scale structure is a magnetic powder sheet that is stacked at a specific angle, with adjacent magnetic powder sheets stacked at an angle of 15-25° and an overlap of 40-60%.
[0011] Optionally, the thickness of the absorbing layer is 30-100 μm; And / or, the thickness of the release material layer is 50-150 μm.
[0012] The second aspect of this application includes a method for preparing the aforementioned ultra-long elongation microwave absorbing material, comprising: The raw materials of component A are first mixed and first heated to obtain component A; The raw materials for component B are subjected to a second mixing and a second heating to obtain component B; The components A and B are subjected to a third mixing and shear-magnetic field synergistic orientation treatment to obtain a microwave absorbing material. The microwave absorbing material is coated onto the surface of the release material layer, cured, and rolled to obtain a microwave absorbing material with ultra-long elongation.
[0013] Optionally, the temperature of the first heating is 110-130℃, the time is 3-5 hours, and the rotation speed is 150-250 rpm; And / or, the second heating temperature is 75-85°C, and the time is 15-20 min; And / or, the contact angle of component B is less than or equal to 30°.
[0014] Optionally, the temperature of the shear-magnetic field synergistic orientation treatment is 55-65℃, and the shear rate is 200-400 s. -1 The time is 12-18 minutes.
[0015] Compared with the prior art, the beneficial effects of this application include: The ultra-long elongation absorbing material provided in this application has a fish-scale-like arrangement structure of a mixture of special modified PVA carrier adhesive (component B) and modified magnetic powder (component A). When the absorbing material is stretched, this fish-scale structure allows the magnetic powder sheets to slide and rotate relative to each other along the inclined direction, similar to the movement of fish scales when a fish bends. This greatly buffers stress and avoids breakage caused by stress concentration. The fish-scale structure significantly improves the elongation of the absorbing material while maintaining its low-frequency absorbing performance. The ultra-long elongation absorbing material provided in this application is particularly suitable for applications that require fitting complex curved surfaces or withstanding repeated deformation.
[0016] The method for preparing ultra-long elongation microwave absorbing materials provided in this application involves a shear-magnetic field synergistic orientation treatment during the preparation process, which helps the magnetic powder to be arranged in a fish-scale-like manner during the coating process. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation on the scope of this application.
[0018] Figure 1 A schematic diagram of the structure of the microwave absorbing material with ultra-long elongation provided in Example 1; Figure 2 A frontal view of the fish scale structure provided in Example 1; Figure 3 The image shows a SEM image of the fish scale structure provided in Example 1. Detailed Implementation
[0019] First, the solution provided in this application will be explained in more detail as follows: The first aspect of this application provides a microwave absorbing material with ultra-long elongation, comprising a microwave absorbing layer and a release material layer stacked together, wherein the surface of the microwave absorbing layer away from the release material layer includes a fish scale structure. The absorbing layer comprises component A and component B; the raw materials of component A include iron-silicon-aluminum alloy magnetic powder, modifier, first wetting agent, and titanate coupling agent; the raw materials of component B include polyvinyl alcohol, plasticizer, crosslinking agent, and second wetting agent. It is important to note that titanate coupling agents can enhance the interface; polyvinyl alcohol can provide good film-forming properties and initial flexibility; plasticizers can significantly reduce the glass transition temperature of PVA (Tg can be reduced to below -15℃), greatly improving its normal room temperature flexibility and ductility; crosslinking agents react with the hydroxyl groups of PVA to form dynamic borate bonds, which can break and dissipate energy under stress and recombine after unloading, giving the material high elasticity and repairability, which is key to ultra-high elongation; polyether-modified silicone oil can significantly reduce the surface tension of the carrier adhesive, ensuring that it can fully wet and coat the modified magnetic powder sheet, forming a good interfacial bond, while improving processing fluidity; The release material layer includes a PET release film.
[0020] It is worth noting that microwave absorbing materials with ultra-long elongation have excellent toughness and magnetic permeability, which greatly increases the applicability of microwave absorbing materials in different environments. They are particularly suitable for occasions that require fitting complex curved surfaces or withstanding repeated deformations, such as curved radomes, flexible electronic device shielding layers, and electromagnetic protection for wearable devices.
[0021] In some embodiments, the modifier includes a silane coupling agent; And / or, the first wetting agent and the second wetting agent each independently comprise polyether-modified silicone oil; And / or, the plasticizer includes dioctyl phthalate and / or environmentally friendly alternative plasticizers; And / or, the crosslinking agent includes borax; And / or, the iron-silicon-aluminum alloy magnetic powder has a particle size of 15-90μm, an aspect ratio ≥8, and a shape including flakes.
[0022] Optionally, the particle size of the iron-silicon-aluminum alloy magnetic powder can be any value between 15μm, 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm or 15-90μm, and the aspect ratio can be any value between 8, 9, 10, 15 or ≥8.
[0023] It should be noted that the beneficial effects are as follows: when the aspect ratio is ≥8, the magnetic powder is less likely to leak during the stretching process of the absorbing material; when the aspect ratio is <8, the magnetic powder is not long enough during the stretching process of the absorbing material, which can easily lead to leakage and affect the magnetic permeability.
[0024] In some embodiments, the mass ratio of component A to component B is 50-80:20-50; Optionally, the mass ratio of component A to component B can be any value between 50:50, 60:40, 70:30, 80:20 or 50-80:20-50; And / or, the iron-silicon-aluminum alloy magnetic powder accounts for 50-60% of the total mass of the absorbing layer.
[0025] Optionally, the iron-silicon-aluminum alloy magnetic powder can account for any value between 50%, 55%, 60%, or 50-60% of the total mass of the absorbing layer.
[0026] In some embodiments, the mass of the modifier is 0.3-0.8% of the mass of the iron-silicon-aluminum alloy magnetic powder; Optionally, the mass of the modifier can be any value between 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8% or 0.3-0.8% of the mass of the iron-silicon-aluminum alloy magnetic powder; And / or, the mass of the first wetting agent is 0.1-0.3% of the mass of the iron-silicon-aluminum alloy magnetic powder; Optionally, the mass of the first wetting agent is any value between 0.1%, 0.2%, 0.3%, or 0.1-0.3% of the mass of the iron-silicon-aluminum alloy magnetic powder; And / or, the mass of the titanate coupling agent is 0.1-0.3% of the mass of the iron-silicon-aluminum alloy magnetic powder; Optionally, the mass of the titanate coupling agent is any value between 0.1%, 0.2%, 0.3%, or 0.1-0.3% of the mass of the iron-silicon-aluminum alloy magnetic powder; And / or, the mass of the plasticizer is 20-30% of the mass of the polyvinyl alcohol; Optionally, the mass of the plasticizer can be any value between 20%, 25%, 30%, or 20-30% of the mass of polyvinyl alcohol; And / or, the mass of the crosslinking agent is 2-4% of the mass of the polyvinyl alcohol; Optionally, the mass of the crosslinking agent can be any value between 2%, 3%, 4% or 2-4% of the mass of polyvinyl alcohol; And / or, the mass of the second wetting agent is 10-14% of the mass of the polyvinyl alcohol.
[0027] Optionally, the mass of the second wetting agent can be any value between 10%, 11%, 12%, 13%, 14% or 10-14% of the mass of polyvinyl alcohol.
[0028] In some embodiments, the mass of the modifier is 0.5% of the mass of the iron-silicon-aluminum alloy magnetic powder; And / or, the mass of the first wetting agent is 0.2% of the mass of the iron-silicon-aluminum alloy magnetic powder; And / or, the mass of the titanate coupling agent is 0.2% of the mass of the iron-silicon-aluminum alloy magnetic powder; And / or, the mass of the plasticizer is 25% of the mass of the polyvinyl alcohol; And / or, the mass of the crosslinking agent is 3% of the mass of the polyvinyl alcohol; And / or, the mass of the second wetting agent is 12% of the mass of the polyvinyl alcohol.
[0029] In some embodiments, the basic unit of the fish scale structure is a magnetic powder sheet that is stacked at a specific angle, with adjacent magnetic powder sheets stacked at an angle of 15-25° and an overlap of 40-60%.
[0030] Optionally, the angle at which adjacent magnetic powder sheets are tilted and stacked can be any value between 15°, 20°, 25° or 15-25°, and the overlap can be any value between 40%, 50%, 60% or 40-60%.
[0031] In some embodiments, the thickness of the absorbing layer is 30-100 μm; Optionally, the thickness of the absorbing layer can be 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm or any value between 30 and 100μm; And / or, the thickness of the release material layer is 50-150 μm.
[0032] Optionally, the thickness of the release material layer can be any value between 50μm, 100μm, 150μm, or 50-150μm.
[0033] The second aspect of this application includes a method for preparing the aforementioned ultra-long elongation microwave absorbing material, comprising: The raw materials of component A are first mixed and first heated to obtain component A; The raw materials for component B are subjected to a second mixing and a second heating to obtain component B; It should be noted that PVA undergoes a reaction during the second heating process to achieve modification. This modification is completed during the preparation of component B and is not a pre-modified PVA. The dynamic borate bond network formed by the modified PVA obtained from component B provides the ability of molecular chain segments to slide and recombine, which can lower the glass transition temperature, improve room temperature flexibility, improve room temperature resilience, enhance wetting and coating effects, etc. The components A and B are subjected to a third mixing and shear-magnetic field synergistic orientation treatment to obtain a microwave absorbing material. It should be noted that under the above process conditions, components A and B are not randomly dispersed or horizontally parallel. They are driven by shear force in the carrier adhesive to form a fish-scale-like arrangement. The fish-scale-like arrangement is due to a special magnetic guidance treatment during the coating of the microwave absorbing material onto the release material layer. This treatment uses a programmed magnetic field to guide the disordered magnetic powder into a fish-scale-like distribution under the action of the magnetic field. Modified magnetic powder, through a coating process, achieves a fish-scale-like arrangement. When unstretched, it forms a closed layer, effectively reflecting and absorbing electromagnetic waves, exhibiting excellent wave absorption performance. During stretching, due to the fish-scale arrangement, the modified magnetic powder layer produces almost no gaps, maintaining the same wave absorption performance. Whether unstretched or during stretching, the modified PVA carrier adhesive's excellent toughness and bonding strength ensure that the magnetic powder adheres tightly to the surface, achieving the desired density. During stretching, the strong toughness of the modified PVA carrier adhesive ensures the magnetic powder can displace without breaking. Simultaneously, during stretching, the modified PVA carrier adhesive firmly holds the magnetic powder, preventing it from detaching or cracking. The wave-absorbing material is then coated onto the surface of a release liner, cured, and rolled to obtain a wave-absorbing material with ultra-high elongation.
[0034] It should be noted that the release material layer can play a good load-bearing role during the rolling process of the microwave absorbing material, reducing the risk of thermal deformation.
[0035] In some embodiments, the temperature of the first heating is 110-130°C, the time is 3-5 hours, and the rotation speed is 150-250 rpm; Optionally, the temperature of the first heating can be any value between 110℃, 120℃, 130℃ or 110-130℃, the time can be any value between 3h, 4h, 5h or 3-5h, and the rotation speed can be any value between 150rpm, 200rpm, 250rpm or 150-250rpm. And / or, the second heating temperature is 75-85°C, and the time is 15-20 min; Optionally, the temperature of the second heating can be any value between 75℃, 80℃, 85℃ or 75-85℃, and the time can be any value between 15min, 16min, 17min, 18min, 19min, 20min or 15-20min; And / or, the contact angle of component B is less than or equal to 30°.
[0036] Optionally, the contact angle of component B can be any value of 30°, 25°, 20°, 15° or ≤30°.
[0037] In some embodiments, the temperature of the shear-magnetic field co-orientation treatment is 55-65°C, and the shear rate is 200-400 s⁻¹. -1 The time is 12-18 minutes.
[0038] Optionally, the temperature for the shear-magnetic field co-orientation treatment can be any value between 55℃, 60℃, 65℃, or 55-65℃, and the shear rate can be 200 s⁻¹. -1 300 s -1 400 s -1 Or 200-400 s -1 Any value between 12 min, 14 min, 16 min, 18 min, or any value between 12 and 18 min.
[0039] The implementation schemes of this application will be described in detail below with reference to specific embodiments. However, those skilled in the art will understand that the following embodiments are only for illustrating this application and should not be regarded as limiting the scope of this application. Unless otherwise specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments used without specified manufacturers are all conventional products that can be purchased commercially.
[0040] Example 1 This embodiment provides a microwave absorbing material with ultra-long elongation, comprising a laminated absorbing layer and a release material layer. The surface of the absorbing layer away from the release material layer has a fish-scale structure, as shown in the specific structure below. Figure 1 As shown, the basic unit of the fish-scale structure is a magnetic powder sheet stacked at a specific angle. Adjacent magnetic powder sheets are stacked at an angle of 15-25° with an overlap of 40-60%. The thickness of the absorbing layer is 38 μm, and the thickness of the release material layer is 75 μm. A front view of the fish-scale structure is shown below. Figure 2 As shown, SEM Figure 3 As shown; The microwave absorbing layer comprises component A and component B. Component A consists of iron-silicon-aluminum alloy magnetic powder (purchased from Ningbo Songke Magnetic Materials, in flake form, with a particle size of 15-90 μm and an aspect ratio ≥8), a modifier (silane coupling agent, KH-550, used at 0.5 wt% of the magnetic powder mass, purchased from Nanjing Shuguang Chemical), a first wetting agent (polyether-modified silicone oil, purchased from BYK Chemical, KF-354L, used at 0.2 wt% of the magnetic powder mass), and a titanate coupling agent (NDZ-101, used at 0.2 wt% of the magnetic powder mass, purchased from Nanjing Shuguang Chemical). The iron-silicon-aluminum alloy magnetic powder accounts for 54.77% of the total mass of the microwave absorbing layer. The raw materials for component B include polyvinyl alcohol (PVA, purchased from Sinopec Sichuan Chemical Industry, model PVA1788 with 88% degree of alcoholysis), plasticizer (dioctyl phthalate, 25 wt% of PVA mass, purchased from Hubei Saning Chemical), crosslinking agent (borax, 3 wt% of PVA mass, purchased from Shandong Haihua), and second wetting agent (polyether modified silicone oil KF-354L, purchased from BYK Chemical, 12 wt% of PVA mass).
[0041] The release material layer is a heat-resistant, frosted PET release film with a thickness of 75μm.
[0042] The second aspect of this embodiment provides a method for preparing a microwave absorbing material with ultra-long elongation, including: S1: Add the iron-silicon-aluminum alloy magnetic powder to a mixer. Under high temperature of 120℃, add silane coupling agent, polyether modified silicone oil and titanate coupling agent in sequence with an addition interval of 10 min and an addition process of 3 min. Spray the iron-silicon-aluminum alloy magnetic powder in a suspended dispersion state evenly by spraying at a speed of 200 rpm for 4 h. Then cool to room temperature to obtain modified magnetic powder component A. S2: Add PVA to the mixing equipment, heat to 80±5℃ to fully melt and plasticize the PVA, maintain 80±5℃, add plasticizer, mix evenly (about 5 minutes), then add crosslinking agent, mix and react for 10 minutes to start forming a dynamic crosslinking network, at this time add wetting agent (polyether modified silicone oil), mix evenly (about 5 minutes) to obtain modified PVA carrier adhesive (component B). S4: Reduce the temperature to 60℃, slowly add modified magnetic powder component A in batches, and precisely control the shear rate at 380 s by adjusting the rotor and screw speeds. -1 Within the specified range, the magnetic orientation device is activated, and the mixing is maintained for 15 minutes under these conditions. The material is then discharged and coated onto the release material layer using a coating device (comma scraper coating device). After being heated and cured, a preliminary microwave absorbing material is obtained. The material is then further pressed using a roller pressing device (multi-roller hot pressing device) to obtain the final microwave absorbing material with ultra-long elongation.
[0043] Mixing equipment: Nanjing Ruiya, a twin-screw extruder with precise temperature and shear rate control.
[0044] This application also includes Examples 2-3 and Comparative Examples 1-4, whose preparation methods are the same as those in the Examples, but the amounts of raw materials are different. The microwave absorbing materials provided in the Examples and Comparative Examples are subjected to performance tests, and the specific data are shown in Table 1. In the Table 1, polyether modified silicone oil 1 is the raw material of component A, and polyether modified silicone oil 2 is the raw material of component B. All the amounts below are in parts.
[0045] Table 1 Raw material usage and performance testing
[0046] analyze: As shown in Table 1, implementation 1 can produce a high-performance ultra-long elongation absorbing material while maintaining a permeability above 110. Compared with Comparative Example 1, when component A is reduced, the elongation increases, but the permeability decreases, affecting the shielding performance of the material. Compared with Comparative Example 2, when component A is increased, the permeability increases, but the elongation decreases significantly, substantially reducing the toughness of the absorbing material.
[0047] Example 2 yields a high-performance ultra-long elongation microwave absorbing material with a high elongation and a permeability of 95. The product performance of this solution is between that of Example 1 and Example 2. Compared to Example 1, when the specific gravity of magnetic powder is reduced and the carrier modified PVA is increased, the product toughness increases and the permeability decreases. Compared to Example 3, when the specific gravity of magnetic powder is increased and the carrier modified PVA is reduced, the product toughness decreases and the permeability increases.
[0048] Example 3 yields a high-performance ultra-long elongation absorbing material with high elongation and a permeability of 90. Compared to Comparative Example 3, when the amount of component B decreases, the elongation tends to decrease, while the permeability increases slightly. Compared to Comparative Example 4, when the amount of component B increases, the elongation tends to increase slightly, but the permeability decreases significantly, affecting the shielding performance of the material during use.
[0049] In summary, the microwave absorbing material with the best overall performance has the highest elongation when the following amounts are used: 60 parts of iron-silicon-aluminum alloy magnetic powder, 0.3 parts of silane coupling agent, 0.12 parts of polyether-modified silicone oil 1, 0.12 parts of titanate coupling agent, 35 parts of PVA178, 8.75 parts of dioctyl phthalate, 1.05 parts of borax, and 4.2 parts of polyether-modified silicone oil 2. Furthermore, a microwave absorbing material with extremely high elongation can be obtained when the following amounts are used: 50 parts of iron-silicon-aluminum alloy magnetic powder, 0.25 parts of silane coupling agent, 0.1 parts of polyether-modified silicone oil 1, 0.1 parts of titanate coupling agent, 45 parts of PVA178, 11.25 parts of dioctyl phthalate, 1.35 parts of borax, and 5.4 parts of polyether-modified silicone oil 2.
[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 therein. Such 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 this application.
[0051] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, any of the claimed embodiments can be used in any combination. The information disclosed in this background section is intended only to enhance the understanding of the general background of this application and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.
Claims
1. A wave-absorbing material with super-long elongation, characterized in that, The surface of the side of the wave-absorbing layer away from the release material layer comprises a fish scale structure; The wave-absorbing layer comprises component A and component B; the raw materials of component A comprise iron-silicon-aluminum alloy magnetic powder, modifier, first wetting agent, and titanate coupling agent; the raw materials of component B comprise polyvinyl alcohol, plasticizer, crosslinking agent, and second wetting agent; The release material layer comprises a PET release film.
2. The material of claim 1, wherein, The modifier comprises silane coupling agent; And / or, the first wetting agent and the second wetting agent each independently comprise polyether-modified silicone oil; And / or, the plasticizer comprises dioctyl phthalate and / or environmentally friendly alternative plasticizer; And / or, the crosslinking agent comprises borax; And / or, the iron-silicon-aluminum alloy magnetic powder has a particle size of 15-90 μm, an aspect ratio of ≥8, and a shape comprising flaky.
3. The material of claim 1, wherein, The mass ratio of component A to component B is 50-80:20-50; And / or, the iron-silicon-aluminum alloy magnetic powder accounts for 50-60% of the total mass of the wave-absorbing layer.
4. The material of claim 1, wherein, The mass of the modifier is 0.3-0.8% of the mass of the iron-silicon-aluminum alloy magnetic powder; And / or, the mass of the first wetting agent is 0.1-0.3% of the mass of the iron-silicon-aluminum alloy magnetic powder; And / or, the mass of the titanate coupling agent is 0.1-0.3% of the mass of the iron-silicon-aluminum alloy magnetic powder; And / or, the mass of the plasticizer is 20-30% of the mass of the polyvinyl alcohol; And / or, the mass of the crosslinking agent is 2-4% of the mass of the polyvinyl alcohol; And / or, the mass of the second wetting agent is 10-14% of the mass of the polyvinyl alcohol.
5. The material of claim 4, wherein, The mass of the modifier is 0.5% of the mass of the iron-silicon-aluminum alloy magnetic powder; And / or, the mass of the first wetting agent is 0.2% of the mass of the iron-silicon-aluminum alloy magnetic powder; And / or, the mass of the titanate coupling agent is 0.2% of the mass of the iron-silicon-aluminum alloy magnetic powder; And / or, the mass of the plasticizer is 25% of the mass of the polyvinyl alcohol; And / or, the mass of the crosslinking agent is 3% of the mass of the polyvinyl alcohol; And / or, the mass of the second wetting agent is 12% of the mass of the polyvinyl alcohol.
6. The material of claim 1, wherein, The basic unit of the fish scale structure is a magnetic powder flake that is angularly inclined and overlaid, and adjacent magnetic powder flakes are angularly inclined to each other at an angle of 15-25° and are overlaid at an overlapping degree of 40-60%.
7. The material of any of claims 1-6, wherein the material has a length of 1 meter or more. The thickness of the wave-absorbing layer is 30-100 μm; And / or, the thickness of the release material layer is 50-150 μm.
8. A method of producing the wave-absorbing material of super-elongation according to any one of claims 1 to 7, characterized by, Comprise: The raw materials of component A are subjected to first mixing and first heating to obtain component A; The raw materials of component B are subjected to second mixing and second heating to obtain component B; The component A and the component B are subjected to third mixing and shear-magnetic field synergistic orientation treatment to obtain wave-absorbing material; The wave-absorbing material is coated onto the surface of the release material layer and is subjected to solidification and rolling to obtain wave-absorbing material with super-long elongation.
9. The method for preparing the microwave absorbing material with ultra-long elongation according to claim 8, characterized in that, The first heating has a temperature of 110-130 ℃, a time of 3-5 h, and a rotation speed of 150-250 rpm; And / or, the second heating has a temperature of 75-85 ℃, a time of 15-20 min; And / or, the contact angle of the component B is less than or equal to 30°.
10. The method for preparing the microwave absorbing material with ultra-long elongation according to claim 8 or 9, characterized in that, The temperature of the shear-magnetic field synergic orientation treatment is 55-65℃, the shear rate is 200-400 s -1 , and the time is 12-18 min.