CN114069251A - A kind of oriented honeycomb wave absorbing material and preparation method thereof - Google Patents
A kind of oriented honeycomb wave absorbing material and preparation method thereof Download PDFInfo
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- CN114069251A CN114069251A CN202111540854.5A CN202111540854A CN114069251A CN 114069251 A CN114069251 A CN 114069251A CN 202111540854 A CN202111540854 A CN 202111540854A CN 114069251 A CN114069251 A CN 114069251A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
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Abstract
本发明公开了一种取向蜂窝吸波材料及其制备方法，属于电磁波功能材料技术领域。所述制备方法包括以下步骤：步骤(1)、蜂窝基体材料浸渍处理：将蜂窝基体材料在磁性吸收剂浆料中浸渍处理，得到涂敷有磁性吸波涂层的蜂窝材料；步骤(2)、蜂窝材料取向及成型：将所述涂敷有磁性吸波涂层的蜂窝材料在磁场中旋转6～12h，然后加热固化，得到所述取向蜂窝吸波材料。本发明采用浸渍法与磁场诱导法相结合，在现有蜂窝结构吸波材料的基础上，通过施加磁场改变蜂窝壁上吸收剂的空间排布，提高了吸收剂的取向程度，所得的蜂窝材料具有显著提升的磁损耗，特别是在P频段，有效提高吸波材料的低频吸收性能。
The invention discloses an oriented honeycomb wave absorbing material and a preparation method thereof, belonging to the technical field of electromagnetic wave functional materials. The preparation method includes the following steps: step (1), honeycomb matrix material dipping treatment: dipping the honeycomb matrix material in a magnetic absorbent slurry to obtain a honeycomb material coated with a magnetic wave absorbing coating; step (2) . Orientation and molding of honeycomb material: rotate the honeycomb material coated with the magnetic wave absorbing coating in a magnetic field for 6-12 hours, and then heat and solidify to obtain the oriented honeycomb wave absorbing material. The invention adopts the combination of the dipping method and the magnetic field induction method, and on the basis of the existing honeycomb structure wave absorbing material, the spatial arrangement of the absorbing agent on the honeycomb wall is changed by applying a magnetic field, so that the orientation degree of the absorbing agent is improved, and the obtained honeycomb material has The significantly improved magnetic loss, especially in the P-band, effectively improves the low-frequency absorption performance of the absorbing material.
Description
Technical Field
The invention belongs to the technical field of electromagnetic functional materials, and particularly relates to an oriented honeycomb wave-absorbing material and a preparation method thereof.
Background
The frequency of the P-band electromagnetic wave is 0.3-1 GHz, the wavelength spans meters and decimeters, and the long-wavelength working frequency band is the main working frequency band of the remote early warning radar, but the long wavelength brings serious challenges to the structure, thickness control and electromagnetic parameter setting of the wave absorbing material. In order to reduce the detectability of the low-frequency long-wave radar to the aircraft, the development of advanced and efficient low-frequency radar wave-absorbing materials becomes a key research direction in the wave-absorbing field.
The honeycomb wave-absorbing material has the advantages of light weight, wide frequency band, high absorption efficiency, high specific strength and specific rigidity, strong designability, impact resistance, good high-temperature stability, good dielectric property and the like, and is widely applied to electromagnetic compatibility, electromagnetic interference design and the like of military equipment and civil electronic equipment. The wave absorbing performance of the honeycomb mainly depends on the specification and size of the honeycomb and an impregnated wave absorbing coating system, and the honeycomb has good wave absorbing performance in the range of 2-18 GHz, but the wave absorbing performance of a P wave band is poor, the average vertical reflectivity of the honeycomb with the plate thickness of 20-35 mm is only-1 to-3 dB, and the wave absorbing requirement of the P wave band cannot be met. At present, in order to improve low-frequency wave absorption, the low-frequency wave absorption is generally realized by two ways of improving the low-frequency magnetic permeability of an absorbent and increasing the structure thickness, but the low-frequency wave absorption has limitations. On the premise that the absorbent and the matrix are determined, the adjustment of the distribution state of the absorbent in the matrix provides an effective way for designing the wave absorption performance. At present, a coating type wave-absorbing material with better orientation of a flaky absorbent can be obtained through mechanical force, and has greater advantages in electromagnetic parameters than a wave-absorbing material with random orientation. However, the existing mechanical orientation methods such as blade coating and the like are not suitable for honeycomb materials, and how to prepare the honeycomb wave-absorbing material with good wave-absorbing performance in the P wave band is a difficult problem to be solved by technical personnel in the field.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the invention aims to provide a preparation method of a honeycomb wave-absorbing material with high orientation. The method is characterized in that an impregnation method and a magnetic field induction method are combined, the electromagnetic parameters of the wave-absorbing honeycomb are adjusted by changing the distribution state and the content of a magnetic absorbent in a honeycomb matrix, and the wave-absorbing performance is adjusted by changing the weight of an impregnated coating, so that the wave-absorbing honeycomb with wide absorption frequency band and thin thickness is finally prepared.
In order to achieve the purpose, the invention provides the following technical scheme:
one of the technical schemes of the invention is a preparation method of an oriented honeycomb wave-absorbing material, which comprises the following steps:
step (1), honeycomb base material dipping treatment: dipping the honeycomb base material in the magnetic absorbent slurry to obtain the honeycomb material coated with the magnetic wave-absorbing coating;
step (2), honeycomb material orientation and molding: and rotating the honeycomb material coated with the magnetic wave-absorbing coating for 5-7 hours in a magnetic field (until the magnetic wave-absorbing coating is changed from a wet state to a surface dry state), and then heating and curing to obtain the oriented honeycomb wave-absorbing material.
Further, the weight of the oriented honeycomb wave-absorbing material is 3-6 times (2-5 times of the weight of the honeycomb matrix material), namely the dry weight of the magnetic wave-absorbing coating on the surface of the oriented honeycomb wave-absorbing material obtained after heating and curing is 2-5 times of the weight of the honeycomb matrix material, and the dry weight of the magnetic wave-absorbing coating is obtained by sequentially carrying out the step (1) and the step (2) once or repeatedly carrying out the step (1) and the step (2) for multiple times.
Further, the dry weight of the magnetic wave-absorbing coating after heating and curing is equal to the weight of the oriented honeycomb wave-absorbing material after heating and curing-the weight of the honeycomb base material without impregnation treatment.
Further, the magnetic absorbent slurry comprises a magnetic absorbent, a high molecular polymer, a solvent and an auxiliary agent.
Further, the magnetic absorbent is soft magnetic alloy particles.
Furthermore, the soft magnetic alloy particles are soft magnetic alloy particles containing one or more elements of iron, cobalt, nickel, silicon and aluminum, and the particle size of the magnetic absorbent is 1-100 mu m.
Further, the high molecular polymer is one or more of polyurethane resin, phenolic resin, acrylic resin and epoxy resin; the auxiliary agent is a dispersing thickener.
Further, the solvent is water or ethanol, and the dispersion-type thickener is a formaldehyde condensate of sodium methyl naphthalene sulfonate/hydroxyethyl cellulose mixture, wherein the content of the formaldehyde condensate of sodium methyl naphthalene sulfonate is 60 wt%.
The formaldehyde condensate of the sodium methyl naphthalenesulfonate in the dispersion-type thickener can improve the dispersibility of the magnetic absorbent, and the hydroxyethyl cellulose can improve the anti-settling property of the slurry. The magnetic absorbent used is magnetic metal micro powder, the density is relatively high, and the common dispersing agent can only play a role in improving the dispersibility, but the formaldehyde condensate of the sodium methyl naphthalenesulfonate/the hydroxyethyl cellulose mixture added into the magnetic absorbent slurry in the invention not only can effectively improve the dispersibility of the magnetic absorbent, but also can greatly improve the long-term anti-settling property of the slurry.
Further, the magnetic absorbent slurry comprises the following raw materials in parts by weight: 100 parts of magnetic absorbent, 10-500 parts of high molecular polymer, 10-120 parts of solvent and 0.1-10 parts of dispersing thickening agent.
Furthermore, the strength of the magnetic field is 5-100 mT.
Further, the magnetic field is composed of a permanent magnet or a Helmholtz coil.
Further, the magnetic field direction includes horizontal, vertical or at a specific angle (30 °, 45 °, 60 °, etc.), and the strength of the magnetic field is controlled by adjusting the permanent magnet pitch or the coil current.
Further, the heating and curing temperature is 120-180 ℃, and the time is 30-120 min.
Further, the rotation in the magnetic field environment is to place the honeycomb material soaked with the magnetic absorbent slurry on an electric rotating disc in a magnetic field, and control the rotating speed of the rotating disc until the honeycomb surface coating changes from a wet state to a surface dry state.
Furthermore, the electromagnetic parameters of the honeycomb wave-absorbing material are adjusted by applying an external magnetic field, so that at least one of the wave-absorbing frequency band, the wave-absorbing width and the wave-absorbing strength is adjusted.
In the second technical scheme of the invention, the oriented honeycomb wave-absorbing material is prepared according to the preparation method.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention combines the dipping method and the magnetic field induction method, adjusts the electromagnetic parameters of the wave-absorbing honeycomb by changing the distribution state and the content of the magnetic absorbent in the honeycomb matrix, and adjusts the wave-absorbing performance by changing the weight of the dipping coating, thereby finally preparing the wave-absorbing honeycomb with wide absorption frequency band and thin thickness. On the basis of the existing wave-absorbing material with the honeycomb structure, the spatial arrangement of the absorbent on the honeycomb wall is changed by applying a magnetic field, so that the orientation degree of the absorbent is improved, and the obtained honeycomb material has remarkably improved magnetic loss, and particularly effectively improves the low-frequency absorption performance of the wave-absorbing material in a P frequency band.
(2) The oriented honeycomb wave-absorbing material disclosed by the invention is simple in preparation method, and can flexibly change the orientation state of the absorbent according to the change of a magnetic field so as to regulate and control the magnetic conductivity and the magnetic loss.
(3) The invention takes a magnetic field as a self-assembly power source, transfers energy to the microscopic scale of the absorbent in a non-contact way, and the absorbent is automatically gathered to form a regular and ordered structure after a series of changes of orientation, migration, arrangement and the like, thereby providing a new method for the design of adjustable components and controllable structure of the wave-absorbing material. According to the invention, different magnetic field strengths are applied to the honeycomb wave-absorbing material, so that the electromagnetic parameters of the material are changed, and the wave-absorbing frequency band, wave-absorbing width and wave-absorbing strength of the honeycomb can be improved finally. The oriented honeycomb wave-absorbing material prepared by the invention can meet the requirement of flexibly regulating and controlling the wave-absorbing performance of the P wave band.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of the distribution of absorbents before and after the orientation of the honeycomb wave-absorbing material of the invention, wherein (a) is an overall diagram of the honeycomb wave-absorbing material before the orientation, and (b) is a detailed diagram of the honeycomb walls of the honeycomb wave-absorbing material before and after the orientation;
FIG. 2 is an SEM image of an oriented honeycomb wave-absorbing material prepared in example 1 of the present invention;
FIG. 3 shows the wave-absorbing performance test results of the oriented honeycomb wave-absorbing material prepared in examples 1-2 and 4-5 of the present invention and the non-oriented honeycomb wave-absorbing material prepared in comparative example 1-2.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in a stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference herein for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The description and examples are intended to be illustrative only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.
The flaky ferrosilicoaluminophosphate powder used in the following examples and comparative examples had a particle size of 20 to 100 μm, a thickness of about 0.5 to 1 μm, and a particle size of 3 to 5 μm.
The dispersing thickener used was a formaldehyde condensate of sodium methylnaphthalenesulfonate/hydroxyethylcellulose mixture, the content of the formaldehyde condensate of sodium methylnaphthalenesulfonate being 60% by weight.
Example 1
In the embodiment, an aramid honeycomb material (the thickness of a flat plate is 20mm) with 2.75mm cell side length, sheet iron-silicon-aluminum powder (the particle size is 50 μm, the thickness is about 1 μm, and the content of each element is 9.0-10.0 wt% of silicon, 5.0-6.0 wt% of aluminum and the balance of iron) and water-based acrylic resin are used as main raw materials, and the specific preparation method comprises the following steps:
(1) preparation of magnetic absorbent slurry: adding 100 parts of iron-silicon-aluminum powder into 62.5 parts of water-based acrylic resin, and adding 112.5 parts of water and 1 part of dispersion thickening agent to adjust the viscosity of the slurry; dispersing by adopting a dispersion machine at the rotating speed of 1000rpm for 1h to prepare Fe-Si-Al magnetic wave-absorbing slurry;
(2) honeycomb impregnation: horizontally placing the honeycomb matrix material in the wave-absorbing slurry, lifting the slurry after the slurry is completely submerged, and soaking the honeycomb turnover surface once again; placing the honeycomb in another clean container, and shaking to remove the redundant coating, wherein the positive and negative sides are respectively performed once;
(3) orientation of the honeycomb wave-absorbing material: horizontally placing the honeycomb soaked with the wave-absorbing slurry on a rotating platform, and rotationally orienting in a magnetic field environment, wherein the magnetic field intensity of the central distance is 30mT, the rotational orientation time is 6 hours, and the magnetic wave-absorbing coating is changed from a wet state to a surface dry state;
(4) forming an oriented honeycomb wave-absorbing material: and after the rotational orientation is finished, taking down the honeycomb, placing the honeycomb in an oven environment at 130 ℃, and drying and curing for 30 min.
(5) Repeating the steps for 2 times to ensure that the weight of the oriented honeycomb wave-absorbing material reaches 4 times of that of the honeycomb matrix material, namely the dry weight of the wave-absorbing coating formed on the surface of the oriented honeycomb wave-absorbing material obtained after heating and curing reaches 3 times of that of the honeycomb matrix material.
Example 2
In the embodiment, an aramid honeycomb material (the thickness of a flat plate is 20mm) with 2.75mm cell side length, sheet iron-silicon-aluminum powder (the particle size is 50 μm, the thickness is about 1 μm, and the content of each element is 9.0-10.0 wt% of silicon, 5.0-6.0 wt% of aluminum and the balance of iron) and water-based acrylic resin are used as main raw materials, and the specific preparation method comprises the following steps:
(1) preparing magnetic absorbent slurry: adding 100 parts of iron-silicon-aluminum powder into 210 parts of water-based acrylic resin, and adding 100 parts of water and 1 part of dispersion type thickening agent to adjust the viscosity of the slurry; dispersing by adopting a dispersion machine at the rotating speed of 1000rpm for 1h to prepare Fe-Si-Al magnetic wave-absorbing slurry;
(2) honeycomb impregnation: horizontally placing the honeycomb matrix material in the wave-absorbing slurry, lifting the slurry after the slurry is completely submerged, and soaking the honeycomb turnover surface once again; placing the honeycomb in another clean container, and shaking to remove the redundant coating, wherein the positive and negative sides are respectively performed once;
(3) orientation of the honeycomb wave-absorbing material: horizontally placing the honeycomb soaked with the wave-absorbing slurry on a rotating platform, and rotationally orienting in a magnetic field environment, wherein the magnetic field intensity of the central distance is 30mT, the rotational orientation time is 6 hours, and the magnetic wave-absorbing coating is changed from a wet state to a surface dry state;
(4) forming an oriented honeycomb wave-absorbing material: and after the rotational orientation is finished, taking down the honeycomb, placing the honeycomb in an oven environment at 130 ℃, and drying and curing for 30 min.
(5) Repeating the steps for 3 times to ensure that the weight of the oriented honeycomb wave-absorbing material reaches 4 times of that of the honeycomb matrix material, namely the dry weight of the wave-absorbing coating formed on the surface of the oriented honeycomb wave-absorbing material obtained after heating and curing reaches 3 times of that of the honeycomb matrix material.
Example 3
In the embodiment, an aramid fiber honeycomb material (the thickness of a flat plate is 20mm) with a 2.75mm cell side length, carbonyl iron powder and water-based acrylic resin are used as main raw materials, and the specific preparation method comprises the following steps:
(1) preparation of magnetic absorbent slurry: adding 100 parts of iron powder to 62.5 parts of water-based acrylic resin, and adding 112.5 parts of water and 1 part of dispersion type thickener to adjust the viscosity of the slurry; dispersing for 1h by adopting a dispersion machine with the rotating speed set to 1000rpm to prepare ferromagnetic wave-absorbing slurry;
(2) honeycomb impregnation: horizontally placing the honeycomb matrix material in the wave-absorbing slurry, lifting the slurry after the slurry is completely submerged, and soaking the honeycomb turnover surface once again; placing the honeycomb in another clean container, and shaking to remove the redundant coating, wherein the positive and negative sides are respectively performed once;
(3) orientation of the honeycomb wave-absorbing material: horizontally placing the honeycomb soaked with the wave-absorbing slurry on a rotating platform, and rotationally orienting in a magnetic field environment, wherein the magnetic field intensity of the central distance is 30mT, the rotational orientation time is 6 hours, and the magnetic wave-absorbing coating is changed from a wet state to a surface dry state;
(4) forming an oriented honeycomb wave-absorbing material: and after the rotational orientation is finished, taking down the honeycomb, placing the honeycomb in an oven environment at 130 ℃, and drying and curing for 30 min.
(5) Repeating the steps for 2 times to ensure that the weight of the oriented honeycomb wave-absorbing material reaches 4 times of that of the honeycomb matrix material, namely the dry weight of the wave-absorbing coating formed on the surface of the oriented honeycomb wave-absorbing material obtained after heating and curing reaches 3 times of that of the honeycomb matrix material.
Example 4
The difference from example 1 is that the central magnetic field strength is 5 mT.
Example 5
The difference from example 1 is that the central magnetic field strength is 100 mT.
Comparative example 1
The comparison example adopts an aramid fiber honeycomb material with 2.75mm cell side length (the thickness of a flat plate is 20mm), sheet iron-silicon-aluminum powder (the particle size is 50 mu m, the thickness is about 1 mu m, and the content of each element is respectively 9.0-10.0 wt% of silicon, 5.0-6.0 wt% of aluminum and the balance of iron) and water-based acrylic resin as main raw materials, and the specific preparation method comprises the following steps:
(1) preparing magnetic absorbent slurry: adding 100 parts of iron-silicon-aluminum powder into 62.5 parts of water-based acrylic resin, and adding 112.5 parts of water and 1 part of dispersion thickening agent to adjust the viscosity of the slurry; dispersing by adopting a dispersion machine at the rotating speed of 1000rpm for 1h to prepare Fe-Si-Al magnetic wave-absorbing slurry;
(2) honeycomb impregnation: placing the honeycomb matrix material in the wave-absorbing slurry, lifting the slurry after the slurry is completely submerged, and soaking the honeycomb turnover surface once again; placing the honeycomb in another clean container, and shaking to remove the redundant coating, wherein the positive and negative sides are respectively performed once;
(3) forming the honeycomb wave-absorbing material: drying at room temperature, drying, oven drying at 130 deg.C, and curing for 30 min.
(4) Repeating the steps for 2 times to ensure that the weight of the non-oriented honeycomb wave-absorbing material is 4 times of that of the honeycomb matrix material, namely the dry weight of the wave-absorbing coating formed on the surface of the non-oriented honeycomb wave-absorbing material obtained after heating and curing is 3 times of that of the honeycomb matrix material.
Comparative example 2
The comparison example adopts an aramid fiber honeycomb material with 2.75mm cell side length (the thickness of a flat plate is 20mm), sheet iron-silicon-aluminum powder (the particle size is 50 mu m, the thickness is about 1 mu m, and the content of each element is respectively 9.0-10.0 wt% of silicon, 5.0-6.0 wt% of aluminum and the balance of iron) and water-based acrylic resin as main raw materials, and the specific preparation method comprises the following steps:
(1) preparing magnetic absorbent slurry: adding 100 parts of iron-silicon-aluminum powder into 210 parts of water-based acrylic resin, and adding 100 parts of water and 1 part of dispersion type thickening agent to adjust the viscosity of the slurry; dispersing by adopting a dispersion machine at the rotating speed of 1000rpm for 1h to prepare Fe-Si-Al magnetic wave-absorbing slurry;
(2) honeycomb impregnation: placing the honeycomb matrix material in the wave-absorbing slurry, lifting the slurry after the slurry is completely submerged, and soaking the honeycomb turnover surface once again; placing the honeycomb in another clean container, and shaking to remove the redundant coating, wherein the positive and negative sides are respectively performed once;
(3) forming the honeycomb wave-absorbing material: drying at room temperature, drying, oven drying at 130 deg.C, and curing for 30 min.
(4) Repeating the steps for 3 times to ensure that the weight of the non-oriented honeycomb wave-absorbing material is 4 times of that of the honeycomb matrix material, namely the dry weight of the wave-absorbing coating formed on the surface of the non-oriented honeycomb wave-absorbing material obtained after heating and curing is 3 times of that of the honeycomb matrix material.
Effect verification
(1) Distribution state of absorbent before and after orientation of honeycomb wave-absorbing material
The schematic distribution diagram of the absorbent before and after orientation of the honeycomb wave-absorbing material is shown in figure 1, wherein (a) is an overall diagram of the honeycomb wave-absorbing material before orientation, and (b) is a detailed diagram of the honeycomb walls of the honeycomb wave-absorbing material before and after orientation; as can be seen from fig. 1, in the absence of magnetic field induction, the adsorbent is mainly oriented along the cell walls, and the direction of the adsorbent is changed to be aligned perpendicular to the cell walls after the magnetic field is applied.
(2) SEM image
Scanning the oriented honeycomb wave-absorbing material prepared in example 1 by an electron microscope, wherein an SEM image of the SEM image is shown in figure 2, and as can be seen from figure 2, the sendust absorbent is uniformly dispersed in the resin matrix, the orientation state is good, and the long axes of the absorbent are oriented along the direction of the honeycomb wall and are arranged in parallel.
(3) Wave absorbing property
The wave absorption performance of the oriented honeycomb wave-absorbing materials prepared in examples 1-2 and 4-5 and the wave absorption performance of the non-oriented honeycomb wave-absorbing materials prepared in comparative examples 1-2 are tested, and the results are shown in fig. 2, and the comparison between example 1 and comparative example 1 and the comparison between example 2 and comparative example 2 show that the absorption peak moves to low frequency after the orientation of the magnetic field under the same weight increasing condition. Comparing example 1 with example 2, it was found that the absorption peak was shifted to a lower frequency as the absorbent content was increased, while the absorption peak was deepened (the absorbent content of example 1 was higher, the absorption peak thereof was located at a lower frequency, and the absorption peak was deeper). Comparing examples 1, 4 and 5, the absorption peak is obviously moved to low frequency along with the increase of the magnetic field intensity, the P-band absorption performance is obviously improved and is basically below-5 dB, wherein the reflectivity of 0.56 and 0.74GHz is < -20 dB; meanwhile, a wider bandwidth is obtained, and the maximum bandwidth of < -10dB is 0.57-0.96 GHz. However, the absorption peak is not shifted to a lower frequency as the magnetic field strength is larger, but if the magnetic field strength is too large, the magnetic absorbent is subjected to an increased force, is no longer aligned in parallel with the cell walls, and is aligned in a single direction, and the absorption performance is reduced, so that the absorption peak of example 5 is at a position having a slightly higher frequency than that of example 1. However, in the case of a uniform thickness, the dielectric constant and the magnetic permeability of the oriented material are improved relative to those of a randomly distributed honeycomb, and the position of the absorption peak of the oriented material is shifted in the low-frequency direction, so that good low-frequency absorption performance is obtained.
Similar effects and conclusions as the above example can be achieved by using any other commercially available honeycomb material as the honeycomb base material, any other soft magnetic alloy particles containing one or more of iron, cobalt, nickel, silicon, and aluminum as the magnetic absorbent in the magnetic absorbent slurry, and one or more of urethane resin, phenol resin, acrylic resin, and epoxy resin as the high molecular polymer in the magnetic absorbent slurry.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A preparation method of an oriented honeycomb wave-absorbing material is characterized by comprising the following steps:
step (1), honeycomb base material dipping treatment: dipping the honeycomb base material in the magnetic absorbent slurry to obtain the honeycomb material coated with the magnetic wave-absorbing coating;
step (2), honeycomb material orientation and molding: and rotating the honeycomb material coated with the magnetic wave-absorbing coating for 6-12 hours in a magnetic field, and then heating and curing to obtain the oriented honeycomb wave-absorbing material.
2. The preparation method of the oriented honeycomb wave-absorbing material according to claim 1, wherein the weight of the oriented honeycomb wave-absorbing material is 2-5 times of that of the honeycomb matrix material.
3. The method for preparing the oriented honeycomb wave-absorbing material according to claim 1, wherein the magnetic absorbent slurry comprises a magnetic absorbent, a high molecular polymer, a solvent and an auxiliary agent.
4. The preparation method of the oriented honeycomb wave-absorbing material according to claim 3, wherein the magnetic absorbent is soft magnetic alloy particles, and the particle size of the magnetic absorbent is 1-100 μm.
5. The method for preparing the oriented honeycomb wave-absorbing material according to claim 3, wherein the high molecular polymer is one or more of polyurethane resin, phenolic resin, acrylic resin and epoxy resin; the solvent is water or ethanol; the auxiliary agent is a dispersing thickener.
6. The preparation method of the oriented honeycomb wave-absorbing material according to claim 5, wherein the magnetic absorbent slurry comprises the following raw materials in parts by weight: 100 parts of magnetic absorbent, 10-500 parts of high molecular polymer, 10-120 parts of solvent and 0.1-10 parts of dispersing thickening agent.
7. The preparation method of the oriented honeycomb wave-absorbing material according to claim 1, wherein the strength of the magnetic field is 5-100 mT.
8. The preparation method of the oriented honeycomb wave-absorbing material according to claim 1, wherein the heating and curing temperature is 120-180 ℃ and the time is 30-120 min.
9. An oriented honeycomb wave-absorbing material prepared according to the preparation method of any one of claims 1-8.
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