CN112250989A - Wave-absorbing slurry and preparation method of honeycomb wave-absorbing material - Google Patents
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Abstract
The invention relates to a wave-absorbing slurry and a preparation method of a honeycomb wave-absorbing material, the wave-absorbing slurry is soaked on a base material to prepare the material, the honeycomb wave-absorbing material is of a multilayer structure, the number of structural layers is at least 2, and different structural layers, the height of each layer and the weight of each layer needing to be soaked are designed according to impedance matching. According to the invention, the honeycomb material is mainly utilized to carry out the impregnation scheme of the multilayer structure design, so that the impedance matching effect of the honeycomb material and air is improved under the condition that the thickness of the honeycomb is integrally fixed, the problem that the mechanical property of the wave-absorbing material is reduced by a multilayer honeycomb bonding mode is solved, and the broadband and efficient wave-absorbing effect is achieved under the thinner thickness. And because finished white honeycombs are directly used for impregnation, the process is simple, the cost is low, and the operability is high.
Description
Technical Field
The invention relates to the field of wave-absorbing materials, in particular to a wave-absorbing slurry and a preparation method of a honeycomb wave-absorbing material.
Background
The wave-absorbing material is a functional material capable of effectively absorbing and attenuating incident electromagnetic waves, and the basic principle of the wave-absorbing material is to dissipate the incident electromagnetic waves in the material in a heat dissipation manner.
The aramid fiber honeycomb is a composite material prepared by utilizing a bionics principle, has a shape similar to that of a natural honeycomb, can reduce the weight of the material to the maximum extent while ensuring the strength, and is a novel high-light and high-strength material. The existing technical means is that the formed white honeycomb is obtained by dipping wave-absorbing slurry and then drying or airing, the obtained wave-absorbing material is a uniform material, namely, the electromagnetic parameters of the material are constant along the direction of a honeycomb hole and the direction vertical to the honeycomb hole, the wave-absorbing honeycomb material is usually limited near a specific frequency point for absorbing electromagnetic waves, and wider and stronger electromagnetic absorption can not be realized under the condition of thickness limitation; part of researchers respectively impregnate the honeycombs in multiple layers, and then bond the honeycombs with different impregnation degrees together, so that the wave-absorbing material and air are well matched in impedance, the wave-absorbing bandwidth and the absorbing strength of the wave-absorbing material are further widened, and the mechanical property of the whole wave-absorbing honeycomb material is reduced by the aid of the multiple layers of bonding. Aiming at the problems in the prior art, a novel honeycomb wave-absorbing material and a preparation method thereof are researched and designed, so that the problem in the prior art is very necessary to be overcome.
Disclosure of Invention
The invention aims to overcome the defects that the existing wave-absorbing honeycomb cannot realize wider and stronger electromagnetic absorption under the condition of thickness limitation due to single-layer impregnation, or the wave-absorbing material and air are well matched in impedance by a mode of respectively impregnating a plurality of layers of honeycombs and then bonding the honeycombs with different impregnation degrees together, but the integral mechanical property of the wave-absorbing honeycomb material is reduced by a multi-layer bonding mode, and the honeycomb wave-absorbing material and the preparation method thereof are provided.
The purpose of the invention is realized by the following technical scheme: a wave-absorbing slurry and a preparation method of a honeycomb wave-absorbing material are characterized in that a wave-absorbing honeycomb is designed according to impedance matching characteristics through a multi-layer structure design to obtain the content of an absorbent required to be impregnated in each layer of honeycomb, and a specific wave-absorbing slurry is used for impregnating the whole white honeycomb layer by layer according to design requirements.
The wave-absorbing slurry comprises the following components in percentage by mass: 60-90 parts of adhesive, 60-100 parts of absorbent, 100 parts of solvent, 0.1-1 part of dispersant, 0.1-0.5 part of anti-settling agent and 0.1-1 part of toughening agent;
in the wave-absorbing slurry, the absorbent is selected from at least one of carbon black, graphene and carbon nanotubes; the adhesive is selected from at least one of phenolic resin, polyurethane resin, epoxy resin and polyimide resin; the solvent is industrial water or ethanol.
The multilayer structure has the structural layer number more than or equal to 2, and different structural layer numbers, the height of each layer and the weight of each layer needing to be soaked are designed according to impedance matching.
The invention also provides a preparation method of the honeycomb wave-absorbing material, which comprises the following steps:
s1, weighing 60-90 parts of adhesive, 60-100 parts of absorbent, 100 parts of solvent, 0.1-1 part of dispersant, 0.1-0.5 part of anti-settling agent and 0.1-1 part of toughening agent;
s2: pouring the adhesive into a solvent, fully stirring by using a dispersion machine, adding the absorbent, the dispersing agent, the dustproof agent and the toughening agent into the uniformly stirred solution, and stirring by using the dispersion machine to obtain wave-absorbing slurry;
s3: the whole white honeycomb is divided into a plurality of areas from top to bottom according to the T direction, each area is provided with a corresponding height, each height needs to be impregnated with different weights, and the areas of the white honeycomb are respectively impregnated with wave-absorbing slurry with corresponding weights.
The T-direction height Hmm of the honeycomb is 20-50 mm, and the area of the honeycomb is Xm2The white honeycomb is divided into 1, 2, 3 and 4 different regions, the heights are H1= Hmm, H2= (0.6:. H-0.9:. H) mm, H3= (0.3:. H-0.8:. H) mm and H4= (0.1:. H-0.6:. H) mm, the impregnation weights are (30:. a. 1-35:. a.h 1) g, (25:. a.h 2-33:. a.h 2) g, (16:. a.h 3-30 a.h 3) g and (10 a 4-30 a. 4) g, and a is the area of the impregnated region.
In the preparation method of the honeycomb wave-absorbing material, in the step S3, the wave-absorbing slurry is soaked in the whole way, when the area 1 meets the soaking weight, the area 1 finishes the soaking requirement, and the height obtained by subtracting the height of the area 1 from the total height is the second soaking height; when the 2 area meets the dipping weight, the 2 area finishes the dipping requirement, and the height of the total height minus the 1 area plus the 2 area is the second dipping height; and the hard impregnation to the last zone meets the final impregnation requirement.
After the honeycomb is soaked in the wave-absorbing slurry every time, drying is carried out in an oven, the temperature of the oven is set to be 90-120 ℃, and the heat is preserved for 1-3 hours. After the whole all regions are soaked, curing is carried out in an oven, the temperature of the oven is set to be 160-180 ℃, and the temperature is kept for 3-6 hours.
The honeycomb wave-absorbing material and the preparation method thereof have the following beneficial effects: the honeycomb wave-absorbing material disclosed by the invention has impedance matching characteristics, can realize broadband strong electromagnetic absorption under a thinner thickness, and simultaneously avoids the problem that the mechanical property of the wave-absorbing material is reduced by a multi-layer honeycomb bonding mode, because the wave-absorbing material is directly impregnated by a finished white honeycomb, the process is simple, the manufacturing cost is low, and the operability is high.
Drawings
FIG. 1 is a schematic diagram of a white honeycomb structure;
FIG. 2 is a schematic view of a honeycomb gradient multilayer structure design;
FIG. 3 is a schematic view of a honeycomb wave-absorbing material after impregnation;
FIG. 4 is a schematic diagram of the reflectivity of a 20mm honeycomb wave-absorbing material after impregnation;
FIG. 5 is a schematic diagram of the reflectivity of the impregnated 30mm honeycomb wave-absorbing material.
Detailed Description
The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following.
The technical scheme of the invention is detailed below by combining the accompanying drawings and the embodiment.
The invention provides wave-absorbing slurry and a preparation method of a honeycomb wave-absorbing material. Wherein the base material is a finished white honeycomb.
The wave-absorbing slurry comprises the following components in percentage by mass: 60-90 parts of adhesive, 60-100 parts of absorbent, 100 parts of solvent, 0.1-1 part of dispersant, 0.1-0.5 part of anti-settling agent and 0.1-1 part of toughening agent; in the wave-absorbing slurry, the absorbent is selected from at least one of carbon black, graphene and carbon nanotubes; the adhesive is selected from at least one of phenolic resin, polyurethane resin, epoxy resin and polyimide resin; the solvent is industrial water or ethanol.
The invention also provides a preparation method of the honeycomb wave-absorbing material, which comprises the following steps:
preparing wave-absorbing slurry; the whole white honeycomb is divided into a plurality of areas from top to bottom according to the T direction, each area is provided with a corresponding height, each height needs to be impregnated with different weights, and the areas of the white honeycomb are respectively impregnated with wave-absorbing slurry with corresponding weights. After the honeycomb is soaked in the wave-absorbing slurry every time, drying and heat preservation are carried out in an oven.
The technical solution of the present invention is further described below with reference to the embodiments.
Example 1
S11, preparing the wave-absorbing slurry: weighing 10000g of absolute ethyl alcohol, 3500g of graphene, 3000g of carbon black, 6000g of phenolic resin, 10g of dispersing agent, 10g of anti-settling agent and 10g of toughening agent; pouring phenolic resin into absolute ethyl alcohol, fully stirring by using a dispersion machine at the rotating speed of 400-450r/min for 10min, adding the graphene, the carbon black, the dispersing agent, the anti-settling agent and the toughening agent into the uniformly stirred solution, and stirring by using the dispersion machine at the rotating speed of 400-450r/min for 10min to obtain the wave-absorbing slurry.
S21, preparing the honeycomb wave-absorbing material: the white honeycomb with the thickness of 20mm and the thickness of 1000mm by 1000mm is divided into four different areas of 1, 2, 3 and 4, the height is respectively 20mm, 18mm, 10mm and 6mm, the dipping weight is respectively 650g, 540g, 200g and 900g, and the error is not more than plus or minus 10 g. Firstly, dipping the whole area by using wave-absorbing slurry; whether the dipping weight is reached is judged through the increased wet weight, and if the dipping weight exceeds the target weight at one time, the cold air knife can be used for blowing off the dipping materials with redundant weight. If not, multiple impregnations may be used. Drying treatment is carried out by using an oven after each impregnation is finished, the temperature of the oven is set to be 80-120 ℃, and the temperature is kept for 20-40 minutes. Then dipping the 2 area and drying; then dipping and drying the 3 regions; finally, 4 areas are impregnated and dried. And (5) finishing the impregnation and drying of all the areas. And curing the integral wave-absorbing honeycomb, setting the temperature of the oven at 160 ℃ and 180 ℃, and preserving the heat for 6 hours. And after the honeycomb is cut, the honeycomb wave-absorbing material is obtained.
S31, testing the wave absorption performance of the obtained integrated honeycomb wave-absorbing material by using an arch method, wherein the test result is shown in figure 4: the average reflectivity of the integrated wave-absorbing honeycomb with the thickness of 20mm is less than-25 dB in the range of 2-18GHz, wherein the average reflectivity of 8-12GHz is less than-30 dB, and the integrated wave-absorbing honeycomb has excellent wave-absorbing performance.
Example 2
Example 2 differs from example 1 mainly in the scheme of resin, honeycomb thickness and impregnation gradient.
S11, preparing the wave-absorbing slurry: weighing 10000g of absolute ethyl alcohol, 3500g of graphene, 3000g of carbon black, 6000g of polyurethane resin, 10g of dispersant and 10g of anti-settling agent; and 10g of toughening agent, pouring the phenolic resin into absolute ethyl alcohol, fully stirring by using a dispersion machine at the rotating speed of 400-450r/min for 10min, adding the graphene, the carbon black, the dispersing agent, the anti-settling agent and the toughening agent into the uniformly stirred solution, and stirring by using the dispersion machine at the rotating speed of 400-450r/min for 10min to obtain the wave-absorbing slurry.
S21, preparing the honeycomb wave-absorbing material: the white honeycomb with the thickness of 30mm and the thickness of 1000mm by 1000mm is divided into four different areas of 1, 2, 3 and 4, the height is respectively 30mm, 23mm, 16mm and 8mm, the dipping weight is respectively 900g, 750g, 320g and 180g, and the error is not more than plus or minus 10 g. Firstly, dipping the whole area by using wave-absorbing slurry; whether the dipping weight is reached is judged through the increased wet weight, and if the dipping weight exceeds the target weight at one time, the cold air knife can be used for blowing off the dipping materials with redundant weight. If not, multiple impregnations may be used. Drying treatment is carried out by using an oven after each impregnation is finished, the temperature of the oven is set to be 80-120 ℃, and the temperature is kept for 20-40 minutes. Then dipping the 2 area and drying; then dipping and drying the 3 regions; finally, 4 areas are impregnated and dried. And (5) finishing the impregnation and drying of all the areas. And curing the integral wave-absorbing honeycomb, setting the temperature of the oven at 160 ℃ and 180 ℃, and preserving the heat for 6 hours. And after the honeycomb is cut, the honeycomb wave-absorbing material is obtained.
S31, testing the wave absorption performance of the obtained integrated honeycomb wave-absorbing material by using an arch method, wherein the test result is shown in figure 5: the average reflectivity of the integrated wave-absorbing honeycomb with the thickness of 30mm in the range of 2-18GHz is less than-25 dB, wherein the average reflectivity of 8-12GHz is less than-35 dB, and the integrated wave-absorbing honeycomb has excellent wave-absorbing performance.
Claims (10)
1. A wave-absorbing slurry is characterized in that: the wave-absorbing slurry comprises 60-90 parts of adhesive, 60-100 parts of absorbent, 100 parts of solvent, 0.1-1 part of dispersant, 0.1-0.5 part of anti-settling agent and 0.1-1 part of toughening agent.
2. The wave-absorbing slurry according to claim 1, wherein: the absorbent is selected from any one or a mixture of any more of carbon black, graphene and carbon nanotubes; the adhesive is selected from any one of phenolic resin, polyurethane resin, epoxy resin and polyimide resin; the solvent is any one of industrial water or ethanol.
3. The method for preparing the wave-absorbing slurry according to claim 1, characterized in that: the method comprises the following steps:
s1: weighing 100 parts of solvent, 60-100 parts of absorbent, 60-90 parts of adhesive, 0.1-1 part of dispersant, 0.1-0.5 part of anti-settling agent and 0.1-1 part of toughening agent;
s2: and pouring the adhesive into the solvent, fully stirring by using a dispersion machine, adding the absorbent, the dispersing agent, the anti-settling agent and the toughening agent into the uniformly stirred solution, and stirring by using the dispersion machine to obtain the wave-absorbing slurry.
4. The preparation method of the wave-absorbing slurry according to claim 3, characterized by comprising the following steps: in step S2, the rotation speed of the dispersion machine is 400-450r/min, and the stirring time is 10 min.
5. A honeycomb wave-absorbing material based on the wave-absorbing slurry in claim 1, which is characterized in that: the honeycomb wave-absorbing material is prepared by dipping wave-absorbing slurry on a base material, the honeycomb wave-absorbing material is of a multilayer structure, the number of structural layers is at least 2, and different structural layers, the height of each layer and the weight of each layer needing dipping are designed according to impedance matching.
6. The cellular wave-absorbing material of claim 5, wherein: the base material is a finished white honeycomb.
7. The preparation method of the honeycomb wave-absorbing material according to claim 5, characterized in that: the method comprises the following steps:
the whole white honeycomb is divided into a plurality of areas from top to bottom according to the T direction, each area is provided with a corresponding height, the multiple areas of the white honeycomb are respectively impregnated with wave-absorbing slurry with corresponding weight according to the weight required by each height, the wave-absorbing slurry is impregnated in the multiple areas of the white honeycomb in a mode of integrally impregnating firstly, after the impregnation weight is met in the area 1, the impregnation requirement is completed in the area 1, and the height obtained by subtracting the height of the area 1 from the total height is the second impregnation height; when the 2 area meets the dipping weight, the 2 area finishes the dipping requirement, and the height of the total height minus the 1 area plus the 2 area is the second dipping height; and the hard impregnation to the last zone meets the final impregnation requirement.
8. The cellular wave-absorbing material of claim 5, wherein: the relation formula of the dipping weight and the dipping height is that the value of the dipping weight is 10-35 times the value of the dipping height multiplied by a, and the value of a is the area of a dipping area.
9. The cellular wave-absorbing material of claim 5, wherein: each impregnation is completed by drying treatment using an oven.
10. The method for preparing the honeycomb wave-absorbing material according to claim 8, wherein the method comprises the following steps: and after the impregnation and drying of all the areas are finished, curing the integral wave-absorbing honeycomb in an oven, wherein the temperature of the oven is set to be 90-120 ℃ during the drying treatment, the temperature is kept for 1-3 hours, and the temperature of the oven is set to be 160-180 ℃ during the curing treatment, and the temperature is kept for 3-6 hours.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113150376A (en) * | 2021-04-14 | 2021-07-23 | 哈尔滨工业大学 | Simulation and preparation method of double-layer ultra-wideband thin wave-absorbing metamaterial |
| CN113451783A (en) * | 2021-06-18 | 2021-09-28 | 西安交通大学 | Phase-change controllable composite wave absorber and preparation and performance regulation and control method thereof |
| CN113858663A (en) * | 2021-09-24 | 2021-12-31 | 成都佳驰电子科技股份有限公司 | Method for forming sawtooth-provided L-shaped variable cross-section hollow-structure composite wave-absorbing component |
| CN114228266A (en) * | 2021-12-16 | 2022-03-25 | 成都佳驰电子科技股份有限公司 | Design and preparation method of honeycomb wave-absorbing material for airfoil structure |
| CN114591645A (en) * | 2022-03-04 | 2022-06-07 | 中国人民解放军火箭军工程大学 | Carbon-based wave-absorbing coating, preparation method thereof and honeycomb sandwich structure composite wave-absorbing material |
| CN116641260A (en) * | 2023-04-28 | 2023-08-25 | 中电科芜湖钻石飞机制造有限公司 | Preparation method of wave-absorbing material and wave-absorbing material |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113150376A (en) * | 2021-04-14 | 2021-07-23 | 哈尔滨工业大学 | Simulation and preparation method of double-layer ultra-wideband thin wave-absorbing metamaterial |
| CN113451783A (en) * | 2021-06-18 | 2021-09-28 | 西安交通大学 | Phase-change controllable composite wave absorber and preparation and performance regulation and control method thereof |
| CN113451783B (en) * | 2021-06-18 | 2022-12-09 | 西安交通大学 | Phase-change controllable composite wave absorber and preparation and performance regulation and control method thereof |
| CN113858663A (en) * | 2021-09-24 | 2021-12-31 | 成都佳驰电子科技股份有限公司 | Method for forming sawtooth-provided L-shaped variable cross-section hollow-structure composite wave-absorbing component |
| CN114228266A (en) * | 2021-12-16 | 2022-03-25 | 成都佳驰电子科技股份有限公司 | Design and preparation method of honeycomb wave-absorbing material for airfoil structure |
| CN114591645A (en) * | 2022-03-04 | 2022-06-07 | 中国人民解放军火箭军工程大学 | Carbon-based wave-absorbing coating, preparation method thereof and honeycomb sandwich structure composite wave-absorbing material |
| CN114591645B (en) * | 2022-03-04 | 2023-02-17 | 中国人民解放军火箭军工程大学 | Carbon-based wave-absorbing coating, preparation method thereof and honeycomb sandwich structure composite wave-absorbing material |
| CN116641260A (en) * | 2023-04-28 | 2023-08-25 | 中电科芜湖钻石飞机制造有限公司 | Preparation method of wave-absorbing material and wave-absorbing material |
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