CN115612324A - Radar wave-absorbing coating and preparation method and application thereof - Google Patents
Radar wave-absorbing coating and preparation method and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C1/00—Fuselages; Constructional features common to fuselages, wings, stabilising surfaces or the like
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/004—Reflecting paints; Signal paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/23—Magnetisable or magnetic paints or lacquers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/32—Radiation-absorbing paints
Abstract
The invention relates to a radar wave-absorbing coating and a preparation method and application thereof, wherein the preparation method comprises the following steps: mixing a wave absorbing agent and high-temperature-resistant inorganic glue to obtain a coating material; arranging the coating material on a metal plate, and carrying out curing treatment to obtain the radar wave-absorbing coating; the wave absorbing agent comprises magnetic powder. The wave absorber is mixed with the high-temperature-resistant inorganic adhesive for synergistic compounding, so that the stability of the coating at high temperature is enhanced, and the high-temperature reflectivity and the high-temperature wave absorbing performance are improved.
Description
Technical Field
The invention belongs to the technical field of preparation processes of high-temperature-resistant wave-absorbing coatings, and relates to a preparation method of a radar wave-absorbing coating, in particular to a radar wave-absorbing coating and a preparation method and application thereof.
Background
With the development of communication, electronics and aerospace technologies, electromagnetic wave pollution is increasingly severe, and research on materials with strong wave absorption performance is urgent, and particularly in the aerospace field, the materials can be applied to various equipment with stealth requirements. However, the preparation process of the wave-absorbing coating meets certain bottlenecks, wherein the application technology of the radar wave-absorbing material is more and more important, the radar wave-absorbing coating is the most widely used radar wave-absorbing material, and the radar wave-absorbing coating has a better wave-absorbing effect and is easy to construct.
CN 114274608A discloses a wave-absorbing stealth material capable of resisting radar scanning, which comprises a substrate layer, a second wave-absorbing layer, a first wave-absorbing layer and a wave-transmitting layer which are sequentially laminated; the wave-transmitting layer is of a hollow structure, and the hollow patterns are squares, circles, crosses, stars or pentagons distributed in an array; the first wave absorption layer comprises modified basalt fibers and a reinforcing material; the second wave-absorbing layer adopts continuous fiber fabric as a matrix reinforcing material, metal wires are embedded in the normal direction of the second wave-absorbing layer to serve as reinforcing ribs, and a composite material with uniform micropore distribution is embedded in the middle of the second wave-absorbing layer to serve as a filler; the first wave absorbing layer and the second wave absorbing layer are arranged according to the electromagnetic wave space transmission impedance matching principle, after electromagnetic waves are projected to penetrate through the wave transmitting layer, the electromagnetic waves are absorbed by the first wave absorbing layer and the second wave absorbing layer by layer, and the rest of the electromagnetic waves are reflected by the base layer and then absorbed again by the second wave absorbing layer and the first wave absorbing layer in the reverse direction. Therefore, the detection capability of the radar of the other side is reduced, and the identification difficulty of the radar of the other side is increased.
The traditional radar wave-absorbing coating mainly adopts carbonyl iron powder as a main absorbent, the density of the absorbent is high, the content of the absorbent in the coating is high, and the surface density of the coating can often reach 4kg/m under the thickness of 1mm through the wave-absorbing coating prepared by using adhesives such as resin and the like 2 The maneuverability of the equipment is influenced, and the reflectivity of the frequency band of 8-18GHz is difficult to reach-8 dB. With the development of the anti-stealth technology of the radar, the radar hasThe radar wave-absorbing material with narrow wave-absorbing frequency band and low absorption strength can not meet the stealth requirement of the battlefield of equipment, and the novel radar wave-absorbing material with wide wave-absorbing frequency band, strong absorption capacity, thin material thickness and small surface density needs to be researched and developed. Research and application of the novel radar wave-absorbing material with broadband and strong absorption characteristics become a current research hotspot.
In recent years, many researches show that the introduction of rare earth elements can remarkably improve the wave absorbing performance of the absorbent, and a great deal of researches on the rare earth absorbent are carried out by a plurality of research institutions. In the research aspect of rare earth absorbent, the research on rare earth element doped ferrite materials is more, in addition, some research results are obtained in the aspects of rare earth transition intermetallic compounds, rare earth manganese-based oxide (LSMO) materials, rare earth doped magnetic films and the like, the rare earth doped ferrite material has good high-frequency magnetism, and is expected to become a new generation of high-frequency magnetic materials and microwave absorbing materials.
For an aircraft, the heat generated by friction with air in the high-speed flight process enables the coating material to withstand high temperature, and although the common wave-absorbing coating material has a good electromagnetic absorption effect, the common wave-absorbing coating material is often difficult to withstand high temperature. The existing radar wave-absorbing coating material does not have the capability of resisting high temperature for a long time or has the defects of serious performance reduction after high temperature resistance, no longer having use value and the like.
Therefore, it is necessary to improve the high temperature resistance of the coating while ensuring the broad band and strong absorption.
Disclosure of Invention
In view of the problems in the prior art, the invention provides a radar wave-absorbing coating and a preparation method and application thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a preparation method of a radar wave-absorbing coating, which comprises the following steps:
mixing a wave absorbing agent and high-temperature-resistant inorganic glue to obtain a coating material; arranging the coating material on a substrate, and carrying out curing treatment to obtain the radar wave-absorbing coating;
the wave absorbing agent comprises magnetic powder.
The wave absorbing agent is mixed with the high-temperature resistant inorganic adhesive for synergistic compounding, so that the stability of the coating at high temperature is enhanced, and the high-temperature reflectivity and the high-temperature wave absorbing performance are improved.
The high-temperature resistant inorganic adhesive referred to in the invention refers to any inorganic adhesive capable of maintaining good temperature and heat resistance at a temperature of over 1000 ℃.
Preferably, the magnetic powder includes a rare earth-based soft magnetic material.
Preferably, the composition of the rare earth-based soft magnetic material is RE 2 (Co,Fe) 17 Where RE is any one or a combination of at least two of Nd, ce, Y, or Pr, typical but non-limiting combinations include a combination of Nd and Ce, ce and Y, Y and Pr, nd, ce and Y, ce, Y and Pr, or Nd, ce, Y and Pr, preferably Y.
Preferably, the mass of wave absorber in the coating material is 20 to 90 wt.%, for example 20 wt.%, 40 wt.%, 50 wt.%, 80 wt.% or 90 wt.%, but not limited to the values cited, and other values not listed in the numerical range are equally applicable, preferably 30 to 60 wt.%.
The wave absorbing agent is doped with a small amount of rare earth ions, so that the magnetocrystalline anisotropy field of the crystal is increased, the coercive force is improved, the hysteresis loss of the wave absorbing material in an alternating electromagnetic field is increased, the doping of the rare earth is beneficial to regulating and controlling the dielectric constant, and the wave absorbing performance of the material is effectively improved.
Preferably, the high-temperature resistant inorganic glue comprises a high-temperature resistant one-component inorganic glue or a high-temperature resistant two-component inorganic glue.
Preferably, the high temperature resistant inorganic glue includes S523 or YK8927.
Preferably, the mixing comprises mechanical stirring.
Preferably, the manner of disposing the coating material on the substrate includes painting and/or spraying.
Preferably, during the coating process, a flat piece of processing paper is arranged on the surface of the substrate.
Preferably, the coating material is coated on the processed paper arranged on the surface of the substrate.
Preferably, the thickness of the application is 0.4 to 0.7mm, and may be, for example, 0.4mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm or 0.7mm, but is not limited to the values recited, and other values not recited within the range of values are equally applicable.
Preferably, the pressure is applied after the smearing to adjust the processed paper to be flat.
Preferably, the pressure is in the range of 100 to 150Pa, and may be, for example, 100Pa, 110Pa, 120Pa, 130Pa, 140Pa or 150Pa, but is not limited to the recited values, and other values within the range of values not recited are equally applicable.
Preferably, the process paper comprises waxed paper.
In the preparation process, the processing paper with good air permeability is arranged between the metal plate and the coating material, so that obvious bubbles do not exist in the product coating, the procedure of removing the bubbles is directly reduced, the stability of the coating is improved, and the probability of cracks is reduced.
The processed paper has excellent air permeability, so that air bubbles between the substrate and the coating material can be completely removed, and the air bubbles in the final material caused by the process are greatly reduced.
Preferably, the smearing mode is as follows:
mixing the coating material and the diluent in a spray gun, connecting an air pump, and spraying the mixed material on a metal plate.
The spraying adopted in the invention can ensure that the sample is uniformly coated on the substrate, thereby being beneficial to effectively regulating and controlling the thickness of the coating.
Preferably, the diluent comprises water and/or xylene.
Preferably, the diluent is present in an amount of 10 to 30 wt.%, for example 10 wt.%, 15 wt.%, 20 wt.%, 25 wt.% or 30 wt.%, based on the mass of the coating material, and is not limited to the recited values, other values not recited in the numerical ranges being equally applicable.
Preferably, the substrate is a metal plate.
Preferably, the temperature range of the curing process is 80 to 180 ℃, for example, 80 ℃, 100 ℃, 120 ℃, 140 ℃, 160 ℃ or 180 ℃, but not limited to the recited values, and other values not recited in the numerical ranges are also applicable.
If the curing temperature exceeds 80-180 ℃, the diluent is easy to lose or the coating is easy to embrittle, so that the bonding strength is reduced, if the curing temperature is too low, the molecular chain of the matrix is difficult to move, the crosslinking density of the coating is too low, and the curing reaction cannot be finished.
Preferably, the curing process comprises a step-wise temperature rise and constant temperature process.
The invention adopts the sectional heating and constant temperature process for curing, and the curing process of the high-temperature resistant inorganic adhesive is divided into three processes of primary curing, basic curing and post-curing. The curing reaction of the high-temperature resistant inorganic adhesive is a process for obtaining and improving performances such as adhesive strength and the like through chemical reactions (polymerization and crosslinking), the curing is a key process for obtaining good adhesive performance, and the adhesive strength is the maximum only when the adhesive is completely cured.
Preferably, the segment comprises at least two segments.
Preferably, the duration of the tempering process is 2 to 6 hours, for example 2 hours, 3 hours, 4 hours, 5 hours or 6 hours, but is not limited to the values listed, and other values not listed in the value range are equally applicable.
Preferably, the curing treatment further comprises sintering.
Preferably, the sintering is performed in an air atmosphere.
Preferably, the temperature rise rate of the sintering is 1 to 6 ℃/min, for example, 1 ℃/min, 2 ℃/min, 3 ℃/min, 4 ℃/min, 5 ℃/min or 6 ℃/min, but is not limited to the values listed, and other values not listed in the numerical range are also applicable.
Preferably, the sintering temperature is 300 to 400 ℃, for example 300 ℃, 320 ℃, 340 ℃, 360 ℃, 380 ℃ or 400 ℃, but is not limited to the recited values, and other values not recited in the numerical range are equally applicable.
Preferably, the constant temperature time for sintering is 10-30 min, such as 10min, 15min, 20min, 25min or 30min, but not limited to the recited values, and other values not recited in the range of values are also applicable.
As a preferable technical solution of the preparation method of the first aspect of the present invention, the preparation method comprises the steps of:
mechanically stirring and mixing the rare earth-based soft magnetic material and the high-temperature-resistant inorganic adhesive to obtain a coating material containing 20-90 wt% of the rare earth-based soft magnetic material, arranging the coating material on a substrate in a smearing and/or spraying manner, wherein the thickness of the coating material is 0.4-0.7 mm, carrying out curing treatment at the temperature range of 80-180 ℃, and then sintering at the temperature of 300-400 ℃ for 10-30 min in an air atmosphere to obtain the radar wave-absorbing coating;
the solidification treatment comprises at least two sections of sectional heating and constant temperature processes, and the time of the constant temperature process is 2-6 h; the temperature rise rate of the sintering is 1-6 ℃/min;
the smearing mode is as follows: arranging flat processed paper on the surface of the substrate, smearing the coating material on the processed paper arranged on the surface of the substrate, applying pressure of 100-150 Pa after smearing, and adjusting the processed paper to be flat;
the spraying mode is as follows: mixing the coating material with 10-30 wt% of water and/or xylene in a spray gun, connecting an air pump, and spraying the mixed material on a substrate.
In a second aspect, the invention provides a radar wave-absorbing coating, which is obtained by the preparation method of the first aspect.
In a third aspect, the invention provides an application of a radar wave-absorbing coating, wherein the radar wave-absorbing coating is used in an aircraft.
By the technical scheme, the invention has the following beneficial effects:
(1) The wave absorber is mixed with the high-temperature-resistant inorganic adhesive for synergistic compounding, so that the stability of the coating at high temperature is enhanced, and the high-temperature reflectivity and the high-temperature wave absorbing performance are improved.
(2) In the preparation process, the processing paper with good air permeability is arranged between the metal plate and the coating material, so that obvious bubbles do not exist in the product coating, the bubble removing procedure is directly reduced, the stability of the coating is improved, and the probability of cracks is reduced.
(3) The wave absorbing agent is doped with a small amount of rare earth ions, so that the magnetocrystalline anisotropy field of the crystal is increased, the coercive force is improved, the hysteresis loss of the wave absorbing material in an alternating electromagnetic field is increased, the doping of the rare earth is beneficial to regulating and controlling the dielectric constant, and the wave absorbing performance of the material is effectively improved.
Drawings
FIG. 1 is a graph of the attenuation coefficient of the coating material in example 1 as a function of frequency.
FIG. 2 is a graph showing TG/DSC relationship of the coating material in example 1.
FIG. 3 is a graph of the high temperature reflectivity of the radar absorbing coating in example 1 as a function of frequency.
FIG. 4 is an enlarged view of the relationship between the high-temperature reflectivity and the frequency of the radar absorbing coating in example 1.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the appended claims.
Example 1
The embodiment provides a preparation method of a radar wave-absorbing coating, which comprises the following steps:
mechanical stirring and mixing Y 2 (Co,Fe) 17 And S523 (next Kun glue industry) high-temperature resistant inorganic glue to obtain a coating material, wherein Y is 2 (Co,Fe) 17 Is 40wt%; setting the coating material to a thickness of 0.65mm on a metal plate by means of smearing and/or spraying, carrying out curing treatment, and then carrying out 35% in an air atmosphereSintering at 0 ℃ for 20min to obtain the radar absorbing coating;
the curing treatment is divided into two-section temperature rise and constant temperature processes, wherein the temperature is raised to 80 ℃, the temperature is kept for 2 hours, then the temperature is raised to 150 ℃, the temperature is kept for 2 hours, and then the temperature is cooled to the room temperature; the temperature rise rate of the sintering is 5 ℃/min;
the smearing mode is as follows: arranging the flat oil wax paper on the surface of the metal plate, smearing the coating material on the oil wax paper arranged on the surface of the metal plate, applying pressure of 120Pa after smearing, and adjusting the oil wax paper to be flat.
Example 2
The embodiment provides a preparation method of a radar wave-absorbing coating, which comprises the following steps:
mechanical stirring and mixing Y 2 (Co,Fe) 17 And YK8927 (next Kun glue industry) to obtain a coating material, wherein Y 2 (Co,Fe) 17 Is 20wt%; setting the coating material to be 0.7mm thick on a metal plate in a coating mode, carrying out curing treatment, and then sintering for 30min at 300 ℃ in an air atmosphere to obtain the radar wave absorbing coating;
the curing treatment is divided into two-section temperature rise and constant temperature processes, wherein the temperature is raised to 90 ℃ firstly, the temperature is kept for 6 hours, then the temperature is raised to 160 ℃, the temperature is kept for 6 hours, and then the temperature is cooled to the room temperature; the temperature rise rate of the sintering is 1 ℃/min;
the smearing mode is as follows: arranging the flat oil wax paper on the surface of the metal plate, smearing the coating material on the oil wax paper arranged on the surface of the metal plate, applying 100Pa pressure after smearing, and adjusting the oil wax paper to be flat.
Example 3
The embodiment provides a preparation method of a radar wave-absorbing coating, which comprises the following steps:
mechanical stirring and mixing Y 2 (Co,Fe) 17 And S523 (next Kun glue industry) high temperature resistant inorganic glue to obtain a coating material, wherein Y 2 (Co,Fe) 17 The mass of (D) is 90wt%; setting the coating material to be 0.4mm thick on the metal plate by adopting a spraying mode, carrying out curing treatment,then sintering the coating for 10min at 400 ℃ in an air atmosphere to obtain the radar wave absorbing coating;
the solidification treatment is divided into two-section temperature rise and constant temperature processes, namely, firstly, the temperature is raised to 100 ℃, the temperature is kept for 4 hours, then, the temperature is raised to 160 ℃, the temperature is kept for 4 hours, and then, the temperature is cooled to room temperature; the temperature rise rate of the sintering is 6 ℃/min;
the spraying mode is as follows: the coating material was mixed with 30wt% water in a spray gun, an air pump was connected, and the mixed material was sprayed onto the substrate.
Example 4
The embodiment provides a preparation method of a radar absorbing coating, and the difference from the embodiment 1 is Y 2 (Co,Fe) 17 Substitution with Nd of equal mass 2 (Co,Fe) 17 。
Example 5
The embodiment provides a preparation method of a radar absorbing coating, and the difference from the embodiment 1 is Y 2 (Co,Fe) 17 Replacement by equal mass of Ce 2 (Co,Fe) 17 。
Example 6
The embodiment provides a preparation method of a radar wave-absorbing coating, and the difference from the embodiment 1 is Y 2 (Co,Fe) 17 Replacement by equal mass Pr 2 (Co,Fe) 17 。
Example 7
The embodiment provides a preparation method of a radar absorbing coating, and the difference from the embodiment 1 is that wax paper is replaced by a PET film.
Example 8
The embodiment provides a preparation method of a radar absorbing coating, and the difference from the embodiment 1 is that wax paper is replaced by A4 paper.
Example 9
The embodiment provides a preparation method of a radar wave-absorbing coating, which is different from the embodiment 1 in that the curing treatment is only a one-stage heating and constant-temperature process, namely heating to 150 ℃, keeping the temperature for 4 hours, and then cooling to room temperature.
Example 10
The embodiment provides a preparation method of a radar wave-absorbing coating, which is different from the embodiment 1 in that the curing treatment is a three-stage heating and constant temperature process, wherein the temperature is increased to 80 ℃ and is kept for 1h, then is increased to 100 ℃ and is kept for 1h, then is increased to 180 ℃ and is kept for 2h, and then is cooled to room temperature.
Comparative example 1
The comparative example provides a preparation method of a radar absorbing coating, and the difference from the example 1 is that no high-temperature resistant inorganic adhesive is contained in the coating material.
Comparative example 2
The comparative example provides a preparation method of a radar absorbing coating, and the difference from the example 1 is that S523 in the coating material is replaced by modified organic silica gel.
Comparative example 3
The comparative example provides a preparation method of a radar absorbing coating, and the difference from the example 1 is that no processing paper is arranged on the surface of the metal plate.
And (3) carrying out mechanical property test and electromagnetic property test on the radar wave absorbing coating, and testing the electromagnetic property of the radar wave absorbing coating by using an Agilent vector network analyzer N5224B.
And (3) testing conditions are as follows: two ports were used, the frequency range was 1-18GHz and the test results are shown in Table 1.
The invention provides a data diagram for example 1, wherein fig. 1 is a graph of attenuation coefficient variation with frequency in example 1, fig. 2 is a graph of TG/DSC in example 1, fig. 3 is a graph of high-temperature reflectivity with frequency, and fig. 4 is an enlarged graph of high-temperature reflectivity with frequency.
TABLE 1
From table 1 and fig. 1-4, the following conclusions can be drawn:
(1) As can be seen from the examples 1-6, the synergistic combination of the wave absorber and the high-temperature resistant inorganic adhesive enhances the stability of the coating at high temperature and improves the high-temperature reflectivity and the high-temperature wave-absorbing performance; meanwhile, in the preparation process, the processing paper with good air permeability is arranged between the metal plate and the coating material, so that obvious bubbles do not exist in the product coating, and the surface of the coating has no cracks.
(2) It can be known from the comparison between examples 7 and 8 and example 1 that the processed paper with excellent air permeability is arranged between the coating material and the metal plate, so that no obvious bubbles exist in the coating of the product, and no cracks exist on the surface of the coating.
(3) As can be seen from the comparison between examples 9 and 10 and example 1, the curing treatment in the present invention is divided into at least two stages of temperature rise and constant temperature, and the curing process of the adhesive is divided into three processes of primary curing, primary curing and post-curing. The adhesive curing reaction is a process for obtaining and improving performances such as adhesive bonding strength and the like through chemical reactions (polymerization and crosslinking), the curing is a key process for obtaining good adhesive bonding performance, and the strength is the maximum only after the adhesive is completely cured. When there is only one segment, the adhesive properties of the glue are affected.
(4) As can be seen from comparison of comparative examples 1 and 2 with example 1, the high-temperature resistant inorganic adhesive and the wave absorbing agent are synergistically compounded, so that the stability of the coating at high temperature is enhanced, the high-temperature reflectivity and the high-temperature wave absorbing performance are improved, and when other high-temperature resistant materials or other binder materials are not added or replaced, the high-temperature resistance improvement effect is poor.
(5) As can be seen from comparison of comparative examples 1 and 2 with example 1, in the preparation process, the processed paper with good air permeability is arranged between the metal plate and the coating material, so that obvious bubbles do not exist in the product coating, the surface of the coating has no cracks, and when the processed paper is not added, the prepared radar wave-absorbing coating has cracks on the surface, the performance is poor, and the radar wave-absorbing coating is not beneficial to use.
In conclusion, the wave absorber is mixed with the high-temperature-resistant inorganic adhesive for synergistic compounding, so that the stability of the coating at high temperature is enhanced, and the high-temperature reflectivity and the high-temperature wave-absorbing performance are improved; meanwhile, in the preparation process, the processing paper with good air permeability is arranged between the metal plate and the coating material, so that obvious bubbles do not exist in the product coating, and the surface of the coating has no cracks.
The present invention is described in detail with reference to the above embodiments, but the present invention is not limited to the above detailed structural features, that is, the present invention is not meant to be implemented only by relying on the above detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. A preparation method of a radar wave-absorbing coating is characterized by comprising the following steps:
mixing a wave absorbing agent and high-temperature-resistant inorganic glue to obtain a coating material; arranging the coating material on a substrate, and carrying out curing treatment to obtain the radar wave-absorbing coating;
the wave absorbing agent comprises magnetic powder.
2. A production method according to claim 1, wherein the magnetic powder includes a rare earth-based soft magnetic material;
preferably, the composition of the rare earth-based soft magnetic material is RE 2 (Co,Fe) 17 Wherein RE is any one or combination of at least two of Nd, ce, Y or Pr;
preferably, the mass of the wave absorber in the coating material is 20-90 wt%.
3. The method for preparing the heat-resistant adhesive according to claim 1 or 2, wherein the high-temperature-resistant inorganic adhesive comprises a high-temperature-resistant one-component inorganic adhesive and/or a high-temperature-resistant two-component inorganic adhesive;
preferably, the mixing comprises mechanical stirring;
preferably, the manner of disposing the coating material on the substrate includes painting and/or spraying.
4. A method for preparing according to claim 3, wherein, in the coating process, a flat piece of processing paper is arranged on the surface of the substrate;
preferably, the coating material is coated on the processing paper arranged on the surface of the substrate;
preferably, the thickness of the coating is 0.4-0.7 mm;
preferably, applying pressure after coating, and adjusting the processing paper to be flat;
preferably, the pressure is 100 to 150Pa;
preferably, the process paper comprises a waxed paper.
5. The method for preparing a cosmetic composition according to claim 3, wherein the applying is carried out by:
mixing the coating material and the diluent in a spray gun, connecting an air pump, and spraying the mixed material on a substrate;
preferably, the diluent comprises water and/or xylene;
preferably, the mass of the diluent is 10 to 30wt% of the mass of the coating material;
preferably, the substrate is a metal plate.
6. The method according to any one of claims 1 to 5, wherein the temperature during the curing treatment is in a range of 80 to 180 ℃;
preferably, the curing process comprises a step-wise temperature rise and constant temperature process;
preferably, the segmented section comprises at least two segments;
preferably, the time of the constant temperature process is 2-6 h.
7. The method according to any one of claims 1 to 6, wherein the curing treatment further comprises sintering;
preferably, the sintering is performed in an air atmosphere;
preferably, the temperature rise rate of the sintering is 1-6 ℃/min;
preferably, the sintering temperature is 300-400 ℃;
preferably, the constant temperature time for sintering is 10-30 min.
8. The production method according to any one of claims 1 to 7, characterized by comprising the steps of:
mechanically stirring and mixing the rare earth-based soft magnetic material and the high-temperature-resistant inorganic adhesive to obtain a coating material containing 20-90 wt% of the rare earth-based soft magnetic material, arranging the coating material on a substrate in a smearing and/or spraying manner, wherein the thickness of the coating material is 0.4-0.7 mm, carrying out curing treatment at the temperature range of 80-180 ℃, and sintering at the temperature of 300-400 ℃ for 10-30 min in an air atmosphere to obtain the radar wave-absorbing coating;
the curing treatment comprises at least two sections of sectional heating and constant temperature processes, and the time of the constant temperature process is 2-6 h; the temperature rise rate of the sintering is 1-6 ℃/min;
the smearing mode comprises the following steps: arranging flat processed paper on the surface of the substrate, smearing the coating material on the processed paper arranged on the surface of the substrate, applying pressure of 100-150 Pa after smearing, and adjusting the processed paper to be flat;
the spraying mode is as follows: mixing the coating material with 10-30 wt% of water and/or xylene in a spray gun, connecting an air pump, and spraying the mixed material on a substrate.
9. A radar wave absorbing coating, characterized in that the radar wave absorbing coating is obtained by the preparation method according to any one of claims 1 to 8.
10. The application of the radar wave absorbing coating is characterized in that the radar wave absorbing coating is used in an aircraft.
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