CN112063261A - Carbon nano organic temperature-resistant wave-absorbing coating, preparation method and coating method - Google Patents
Carbon nano organic temperature-resistant wave-absorbing coating, preparation method and coating method Download PDFInfo
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Abstract
The invention relates to the technical field of wave-absorbing material preparation, in particular to a carbon nano organic temperature-resistant wave-absorbing coating, a preparation method and a coating method, wherein the carbon nano organic temperature-resistant wave-absorbing coating is prepared by well dispersing a carbon nano wave-absorbing agent and a conductive ceramic filler in a phenolic resin matrix and an organic solvent through a ball-milling process; the carbon nano organic temperature-resistant wave-absorbing coating is coated on the surface of a polymer substrate by a spraying process, the carbon nano organic temperature-resistant wave-absorbing coating taking a polymer material as a base is prepared by a temperature programming curing process, and the influence of the coating preparation process parameters, the coating and the curing process parameters on the wave-absorbing performance and the temperature-resistant performance of the coating is researched. By adjusting the square resistance of the coating, the single-band absorption of the wave-absorbing coating on the C band (4 GHz-8 GHz) or Ku band (12.5 GHz-18 GHz) and the simultaneous absorption of the C band and Ku band can be realized, the coating can resist the high temperature of 500 ℃ for a short time and is stable for a long time at 300 ℃.
Description
Technical Field
The invention relates to the technical field of wave-absorbing material preparation, in particular to a carbon nano organic temperature-resistant wave-absorbing coating, a preparation method and a coating method.
Background
With the rapid development of aerospace and electronic equipment, high-power and integrated electronic devices are used more and more widely in aircrafts and electronic equipment. Because the electronic device generates high heat during operation or the device is positioned close to a high heat release source, the ambient temperature of the device reaches hundreds of degrees centigrade. Leading to a difficult problem of electromagnetic protection for critical heated parts.
The particularity of the structure, the working state and the operating environment of the aerospace craft and the highly integrated electronic equipment requires that the electromagnetic protection material used at the key heated part needs to have the performances of temperature resistance, broadband wave absorption and light weight. Based on the above, the temperature-resistant wave-absorbing coating becomes an ideal electromagnetic protection material. The traditional high-temperature-resistant wave-absorbing coating mainly comprises a ceramic-based wave-absorbing coating, and has good high-temperature resistance, high coating density, large coating thickness, higher requirement on a coating process and high cost, so that the use of the ceramic-based wave-absorbing coating in a high-temperature environment below 500 ℃ is limited.
The carbon nano material represented by the graphene and the carbon nano tube has unique advantages in the wave absorbing field and is a wave absorbing agent with great potential. The graphene is small in density, has good chemical stability and thermal stability in an oxygen-free environment, has designable electromagnetic loss performance due to the high dielectric constant, and is a high-efficiency absorbent with great application prospect. The carbon nanotubes have good conductivity, and the well-dispersed carbon nanotubes are mutually lapped to form a conductive network to generate certain resistance loss on incident electromagnetic waves; in addition, based on macroscopic quantum tunneling effect, the carbon nano tube has split electronic energy levels, and the energy level interval is just in the energy range of microwave (10)-2～10-4eV), under the microwave irradiation, the moving atoms and electrons are accelerated to promote magnetization, so that the electron energy is converted into heat energy, and the attenuation of electromagnetic waves is realized; more importantly, the carbon nano tube has the plasma resonance frequency of the absorption peak, the carbon nano tube shows the plasma resonance frequency shift of the absorption peak, and the purpose of regulating and controlling the absorption bandwidth can be achieved by regulating and controlling the size and the displacement of the absorption edge.
However, a single carbon nano material has good electromagnetic reflection characteristics for electromagnetic waves, low impedance matching degree and unsatisfactory wave absorbing performance. The lowest value of pure graphene Reflectance (RL) is reported to be only-7 dB. In addition, pure graphene or carbon nanotubes can be rapidly ablated and fail when exposed to oxygen-containing high temperature environments below 500 ℃. Therefore, the key of the invention is how to coat the carbon nano material and improve the heat resistance and the wave absorbing performance of the carbon nano material.
Disclosure of Invention
In order to overcome the problems of insufficient wave-absorbing performance and insufficient temperature-resistant performance of the existing organic temperature-resistant wave-absorbing coating, the invention provides a carbon nano organic temperature-resistant wave-absorbing coating, a preparation method and a coating method, wherein the high thermal stability of high-temperature-resistant phenolic resin is utilized to endow the coating with good temperature-resistant performance; the electromagnetic absorption performance of the coating is improved by adopting a carbon nano material with high thermal stability and high conductivity loss; the inorganic filler with certain dielectric loss, certain conductivity and good temperature resistance is adopted to further improve the temperature resistance and wave absorbing performance of the coating.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a carbon nano organic temperature-resistant wave-absorbing coating is composed of the following raw materials in parts by weight: 30 to 50 parts of phenolic resin, 3 to 8 parts of carbon nano material, 5 to 15 parts of conductive ceramic filler and 40 to 60 parts of solvent.
Further, the phenolic resin is molten phenolic resin.
Further, the carbon nano material is graphene or multi-walled carbon nano tube; the conductive ceramic material is one or more of conductive mica powder, conductive titanium dioxide, conductive ATO, conductive potassium titanate whisker and conductive barium sulfate; the solvent is absolute ethyl alcohol or acetone.
A preparation method of carbon nano organic temperature-resistant wave-absorbing coating comprises the following steps:
s1, placing the carbon nano-material in a beaker, adding phenolic resin and a solvent, and uniformly mixing;
s2, transferring the mixed system into a ball milling tank for primary ball milling;
and S3, after the primary ball milling is finished, adding the conductive ceramic filler into the ball milling system for secondary ball milling to prepare the carbon nano temperature-resistant wave-absorbing coating.
Further, the time of the primary ball milling in the step S2 is 2 to 6 hours; and the time of the secondary ball milling in the step S3 is 0.5-1 hour.
A coating method of a carbon nano organic temperature-resistant wave-absorbing coating comprises the following steps:
s1, coating the carbon nano temperature-resistant wave-absorbing coating on a base material by adopting a spraying process, and controlling the surface sheet resistance and the wave-absorbing performance of the coating by adjusting the coating thickness;
and S2, curing the coating by temperature programming under normal pressure.
Further, in step S1, the substrate coated with the coating layer is selected from one of glass fiber reinforced epoxy resin, phenolic resin and polyimide.
Further, in the step S1, the substrate is sequentially cleaned by ethanol and deionized water and then coated.
Further, in the step S2, the curing temperature-raising procedure is to keep the temperature at 80 ℃ for 30 min; keeping the temperature at 100 ℃ for 20 min; keeping the temperature at 120 ℃ for 30 min; keeping the temperature at 165 ℃ for 150 min; the curing temperature rise rate is 2 ℃/min.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a preparation method of a carbon nano temperature-resistant wave-absorbing coating, which utilizes the broadband efficient absorption characteristics of graphene and carbon nano tubes, and the high temperature resistance, dielectric loss and resistance loss of conductive ceramic powder as a reinforcing aid, and combines the high temperature resistance of phenolic resin to realize that the coating has the performances of high temperature resistance, rated sheet resistance and electromagnetic loss.
Aiming at the absorption of electromagnetic waves, a part of the electromagnetic waves act on the surface of a coating with rated sheet resistance to form surface current and convert the surface current into heat loss; the other part of the electromagnetic waves react with the carbon nanophase and the ceramic phase to form polarization relaxation, so that dielectric loss of incident electromagnetic waves is generated, and the two loss mechanisms jointly realize effective attenuation of the electromagnetic waves.
Aiming at high temperature resistance, the phenolic resin and the ceramic phase have good thermal stability, can meet the requirement that the coating can resist 500 ℃ of instantaneous high temperature and can keep stable for a long time below 300 ℃. The ceramic phase is uniformly dispersed around the carbon nano phase, and the phenolic resin has good encapsulation effect on the carbon nano phase, so that oxygen can be effectively blocked, and the stability of the coating at high temperature is ensured.
Compared with the prior art, the wave absorbing agent is not required to be added to the polymer substrate, and the light and efficient wave absorbing effect under the high-temperature environment is realized by simply coating the temperature-resistant light coating on the surface of the polymer substrate, so that the wave absorbing material has the effect of resisting the instantaneous high temperature of 500 ℃ and being stable for a long time below 300 ℃. Solves the problems that the conventional wave-absorbing coating fails at high temperature, and the ceramic-based wave-absorbing coating has high cost and high density and is not suitable for the electromagnetic protection of the surface of the polymer below 800 ℃. Compared with a method for modifying a polymer by adopting a wave absorbing agent, the coating scheme adopted by the invention avoids the problems of the reduction of other functions except wave absorption, the complication of processing technology, the increase of weight and the failure in a high-temperature environment caused by filling the wave absorbing agent in the polymer substrate.
Drawings
FIG. 1 is a preparation method of a carbon nano organic temperature-resistant wave-absorbing coating provided by the invention;
FIG. 2 is an SEM image of an organic temperature-resistant wave-absorbing coating using carbon nanotubes as an absorbent according to the present invention;
FIG. 3 is a thermogravimetric curve of the carbon nano organic temperature-resistant wave-absorbing coating provided by the invention;
FIG. 4 is a photograph of a sample of a glass fiber reinforced epoxy resin substrate surface coated with a carbon nano organic temperature resistant wave-absorbing coating;
FIG. 5 is a graph showing the reflectivity of a sample coated with a carbon nano organic temperature-resistant wave-absorbing coating on the surface of a glass fiber reinforced epoxy resin substrate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A carbon nano organic temperature-resistant wave-absorbing coating is composed of the following raw materials in parts by weight: 30 to 50 parts of phenolic resin, 3 to 8 parts of carbon nano material, 5 to 15 parts of conductive ceramic filler and 40 to 60 parts of solvent.
In this embodiment, the phenolic resin is a molten phenolic resin. The carbon nano material is graphene or a multi-walled carbon nano tube; the conductive ceramic material is one or more of conductive mica powder, conductive titanium dioxide, conductive ATO, conductive potassium titanate whisker and conductive barium sulfate; the solvent is absolute ethyl alcohol or acetone.
A preparation method of carbon nano organic temperature-resistant wave-absorbing coating comprises the following steps:
s1, placing the carbon nano-material in a beaker, adding phenolic resin and a solvent, and uniformly mixing;
s2, transferring the mixed system into a ball milling tank for primary ball milling; the time of primary ball milling is 2-6 hours;
and S3, after the primary ball milling is finished, adding the conductive ceramic filler into the ball milling system for secondary ball milling to prepare the carbon nano temperature-resistant wave-absorbing coating. The time of the secondary ball milling is 0.5-1 hour.
A coating method of a carbon nano organic temperature-resistant wave-absorbing coating comprises the following steps:
s1, coating the carbon nano temperature-resistant wave-absorbing coating on the surface-treated base material by adopting a spraying process, and controlling the surface sheet resistance and wave-absorbing performance of the coating by adjusting the coating thickness; the base material is sequentially cleaned by ethanol and deionized water and then coated;
and S2, curing the coating by temperature programming under normal pressure.
In this embodiment, the substrate coated with the coating layer is one selected from glass fiber reinforced epoxy resin, phenolic resin, and polyimide.
In the embodiment, the curing temperature-raising procedure is that the temperature is kept at 80 ℃ for 30 min; keeping the temperature at 100 ℃ for 20 min; keeping the temperature at 120 ℃ for 30 min; keeping the temperature at 165 ℃ for 150 min; the curing temperature rise rate is 2 ℃/min.
FIG. 1 is a preparation method of a carbon nano organic temperature-resistant wave-absorbing coating and a coating provided by the invention;
FIG. 2 is an SEM image of an organic temperature-resistant wave-absorbing coating using carbon nanotubes as an absorbent according to the present invention; in the figure, (a) is an organic temperature-resistant wave-absorbing coating prepared by using a multi-walled carbon nanotube as a carbon nanomaterial, the surface of the coating is relatively flat under an electron microscope, the carbon nanotube exposed in the air can not be seen basically, and a small amount of carbon nanotubes embedded under the surface layer of resin are hidden in individual positions, so that the carbon nanotubes in the coating have good compatibility with the resin matrix, and are well encapsulated in the resin; in the figure (b), the organic temperature-resistant wave-absorbing coating prepared by using graphene as a carbon nano material is shown, the surface of the coating is relatively flat under an electron microscope, and a small amount of graphene sheets in the center of a visual field are embedded on the surface of a resin matrix, so that most graphene sheets are well dispersed in the resin matrix.
Fig. 3 is a thermogravimetric curve of the carbon nano organic temperature-resistant wave-absorbing coating provided by the invention, and it can be seen from the thermogravimetric curve that at the temperature of less than 300 ℃, the curve trend is in a platform shape along with the gradual rise of the temperature from the room temperature, and the sample basically has no obvious weight loss, which indicates that the coating can stably exist at the temperature of less than 300 ℃. And (3) continuously raising the temperature, wherein the sample has obvious weight loss in the temperature range of 300-700 ℃, and the curve is rapidly reduced, and the analysis reason is mainly the weight loss caused by the decomposition of the phenolic resin in the coating in the temperature range. After 700 ℃, the decomposition of the phenolic resin is basically complete, so the curve area is flat. The sample weight is still 92.25% of the initial weight at 500 ℃, which shows that the coating is only slightly decomposed at the temperature, has better temperature resistance, can be used for a long time below 300 ℃, and can resist the high temperature of 500 ℃ in a short time;
FIG. 4 is a photograph of a sample of a carbon nano organic temperature-resistant wave-absorbing coating sprayed on the surface of a glass fiber reinforced epoxy resin substrate, which visually shows the visual effect of the coating after coating;
FIG. 5 is a reflectivity curve of a sample of a glass fiber reinforced epoxy resin substrate surface sprayed with a carbon nano organic temperature-resistant wave-absorbing coating, wherein the sheet resistance of FIG. 5 (a) is 1263.3 Ω/□, the sample has a narrow-band strong absorption characteristic, the Reflectivity (RL) extreme value is-13.53 dB at 6.5 GHz, and the effective bandwidth (RL < -10 dB) is 1.5 GHz; FIG. 5 (b) the sheet resistance is 1612.3 Ω/□, at 15.7 GHz, the Reflectivity (RL) extremum is-12.39 dB, and the effective bandwidth (RL < -10 dB) is 2.3 GHz; the square resistance of FIG. 5 (c) is 758.2 Ω/□, which shows strong absorption characteristic of dual-band narrow band, the Reflectivity (RL) extrema appear at 4.55 GHz and 15.2 GHz, respectively-29.76 dB and-30.78 dB, and the effective bandwidth (RL < -10 dB) reaches 5.75 GHz.
Example 1
1) Weighing 4.7 parts of graphene, 37.3 parts of phenolic resin and 46.8 parts of ethanol, and uniformly mixing;
2) transferring the mixed system into a ball milling tank, carrying out primary ball milling, and setting ball milling time for 3 h;
3) after the primary ball milling is finished, weighing 11.2 parts of conductive potassium titanate, adding the conductive potassium titanate into the ball milling system, and carrying out secondary ball milling for 0.5h to prepare the carbon nano temperature-resistant wave-absorbing coating;
4) taking a glass fiber reinforced epoxy resin substrate with the thickness of 300mm multiplied by 4.5mm, sequentially washing the substrate with ethanol and deionized water, drying, and spraying carbon nano temperature-resistant wave-absorbing coating with the thickness of 30 mu m on the surface of the substrate;
5) placing the coated glass fiber reinforced epoxy resin substrate in a drying oven, and setting a temperature rise program: keeping the temperature at 80 deg.C for 30min, keeping the temperature at 100 deg.C for 20min, keeping the temperature at 120 deg.C for 30min, and keeping the temperature at 165 deg.C for 150 min; the curing temperature rise rate is 2 ℃/min.
The performance of the wave-absorbing coating is shown in figure 5 (a), the sheet resistance is 1263.3 omega/□, the wave-absorbing coating has a narrow-band strong absorption characteristic, the extreme value of the Reflectivity (RL) is-13.53 dB at 6.5 GHz, and the effective bandwidth (RL < -10 dB) is 1.5 GHz.
Example 2
1) Weighing 4.7 parts of multi-walled carbon nanotubes, 37.3 parts of phenolic resin and 46.8 parts of ethanol, and uniformly mixing;
2) transferring the mixed system into a ball milling tank, carrying out primary ball milling, and setting ball milling time for 3 h;
3) after the primary ball milling is finished, weighing 11.2 parts of conductive potassium titanate, adding the conductive potassium titanate into the ball milling system, and carrying out secondary ball milling for 0.5h to prepare the carbon nano temperature-resistant wave-absorbing coating;
4) taking a glass fiber reinforced epoxy resin substrate with the thickness of 300mm multiplied by 4.5mm, sequentially washing the substrate with ethanol and deionized water, drying, and spraying carbon nano temperature-resistant wave-absorbing coating with the thickness of 30 mu m on the surface of the substrate;
5) placing the coated glass fiber reinforced epoxy resin substrate in a drying oven, and setting a temperature rise program: keeping the temperature at 80 deg.C for 30min, keeping the temperature at 100 deg.C for 20min, keeping the temperature at 120 deg.C for 30min, and keeping the temperature at 165 deg.C for 150 min; the curing temperature rise rate is 2 ℃/min.
The performance of the wave-absorbing coating is shown in figure 5 (b), the sheet resistance is 1612.3 omega/□, the Reflectivity (RL) extreme value is-12.39 dB at 15.7 GHz, and the effective bandwidth (RL < -10 dB) is 2.3 GHz.
Example 3
1) Weighing 4.7 parts of graphene, 37.3 parts of phenolic resin and 46.8 parts of ethanol, and uniformly mixing;
2) transferring the mixed system into a ball milling tank, carrying out primary ball milling, and setting ball milling time for 3 h;
3) after the primary ball milling is finished, 11.2 parts of conductive ATO is weighed, and is added into the ball milling system for secondary ball milling for 0.5h to prepare the carbon nano temperature-resistant wave-absorbing coating;
4) taking a phenolic resin substrate of 300mm multiplied by 4.5mm, sequentially washing the substrate with ethanol and deionized water, drying, and spraying carbon nano temperature-resistant wave-absorbing coating with the thickness of 30 mu m on the surface of the substrate;
5) placing the coated phenolic resin substrate in a drying oven, and setting a temperature rise program: keeping the temperature at 80 deg.C for 30min, keeping the temperature at 100 deg.C for 20min, keeping the temperature at 120 deg.C for 30min, and keeping the temperature at 165 deg.C for 150 min; the curing temperature rise rate is 2 ℃/min.
The performance of the wave-absorbing coating is shown in figure 5 (c), the sheet resistance is 758.2 omega/□, the wave-absorbing coating has a dual-band narrow-band strong absorption characteristic, the extreme values of the Reflectivity (RL) appear at 4.55 GHz and 15.2 GHz and are respectively-29.76 dB and-30.78 dB, and the effective bandwidth (RL < -10 dB) reaches 5.75 GHz.
Example 4
1) Weighing 4.7 parts of graphene, 37.3 parts of phenolic resin and 46.8 parts of acetone, and uniformly mixing;
2) transferring the mixed system into a ball milling tank, carrying out primary ball milling, and setting ball milling time for 3 h;
3) after the primary ball milling is finished, weighing 11.2 parts of conductive titanium dioxide, adding the conductive titanium dioxide into the ball milling system, and carrying out secondary ball milling for 0.5h to prepare the carbon nano temperature-resistant wave-absorbing coating;
4) taking a polyimide foam substrate of 300mm multiplied by 4.5mm, sequentially washing the substrate with ethanol and deionized water, drying, and spraying carbon nano temperature-resistant wave-absorbing coating with the thickness of 30 mu m on the surface of the substrate;
5) placing the coated polyimide foam substrate in a drying oven, and setting a temperature rise program: keeping the temperature at 80 deg.C for 30min, keeping the temperature at 100 deg.C for 20min, keeping the temperature at 120 deg.C for 30min, and keeping the temperature at 165 deg.C for 150 min; the curing temperature rise rate is 2 ℃/min.
Example 5
1) Weighing 3.5 parts of multi-walled carbon nanotubes, 32 parts of phenolic resin and 52.1 parts of ethanol, and uniformly mixing;
2) transferring the mixed system into a ball milling tank, carrying out primary ball milling, and setting ball milling time for 3 h;
3) after the primary ball milling is finished, weighing 12.4 parts of conductive mica powder, adding the conductive mica powder into the ball milling system, and carrying out secondary ball milling for 0.5h to prepare the carbon nano temperature-resistant wave-absorbing coating;
4) taking a glass fiber reinforced epoxy resin substrate with the thickness of 300mm multiplied by 4.5mm, sequentially washing the substrate with ethanol and deionized water, drying, and spraying carbon nano temperature-resistant wave-absorbing coating with the thickness of 30 mu m on the surface of the substrate;
5) placing the coated glass fiber reinforced epoxy resin substrate in a drying oven, and setting a temperature rise program: keeping the temperature at 80 deg.C for 30min, keeping the temperature at 100 deg.C for 20min, keeping the temperature at 120 deg.C for 30min, and keeping the temperature at 165 deg.C for 150 min; the curing temperature rise rate is 2 ℃/min.
Example 6
1) Weighing 3.5 parts of multi-walled carbon nanotubes, 32 parts of phenolic resin and 52.1 parts of ethanol, and uniformly mixing;
2) transferring the mixed system into a ball milling tank, carrying out primary ball milling, and setting ball milling time for 3 h;
3) after the primary ball milling is finished, weighing 12.4 parts of conductive barium sulfate, adding the conductive barium sulfate into the ball milling system, and carrying out secondary ball milling for 0.5h to prepare the carbon nano temperature-resistant wave-absorbing coating;
4) taking a glass fiber reinforced epoxy resin substrate with the thickness of 300mm multiplied by 4.5mm, sequentially washing the substrate with ethanol and deionized water, drying, and spraying carbon nano temperature-resistant wave-absorbing coating with the thickness of 30 mu m on the surface of the substrate;
5) placing the coated glass fiber reinforced epoxy resin substrate in a drying oven, and setting a temperature rise program: keeping the temperature at 80 deg.C for 30min, keeping the temperature at 100 deg.C for 20min, keeping the temperature at 120 deg.C for 30min, and keeping the temperature at 165 deg.C for 150 min; the curing temperature rise rate is 2 ℃/min.
Although only the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and all changes are encompassed in the scope of the present invention.
Claims (9)
1. The carbon nano organic temperature-resistant wave-absorbing coating is characterized by comprising the following raw materials in parts by weight: 30 to 50 portions of phenolic resin, 3 to 8 portions of carbon nano material, 5 to 15 portions of conductive ceramic filler and 40 to 60 portions of solvent.
2. The carbon nano organic temperature-resistant wave-absorbing coating as claimed in claim 1, which is characterized in that: the phenolic resin is molten phenolic resin.
3. The carbon nano organic temperature-resistant wave-absorbing coating as claimed in claim 1, which is characterized in that: the carbon nano material is graphene or a multi-walled carbon nano tube; the conductive ceramic material is one or more of conductive mica powder, conductive titanium dioxide, conductive ATO, conductive potassium titanate whisker and conductive barium sulfate; the solvent is absolute ethyl alcohol or acetone.
4. A preparation method of a carbon nano organic temperature-resistant wave-absorbing coating is characterized by comprising the following steps:
s1, placing the carbon nano-material in a beaker, adding phenolic resin and a solvent, and uniformly mixing;
s2, transferring the mixed system into a ball milling tank for primary ball milling;
and S3, after the primary ball milling is finished, adding the conductive ceramic filler into the ball milling system for secondary ball milling to prepare the carbon nano temperature-resistant wave-absorbing coating.
5. The preparation method of the carbon nano organic temperature-resistant wave-absorbing coating according to claim 4, which is characterized by comprising the following steps: the time of primary ball milling in the step S2 is 2-6 hours; and the time of the secondary ball milling in the step S3 is 0.5-1 hour.
6. A coating method of a carbon nano organic temperature-resistant wave-absorbing coating is characterized by comprising the following steps:
s1, coating the carbon nano temperature-resistant wave-absorbing coating on a base material by adopting a spraying process, and controlling the surface sheet resistance and the wave-absorbing performance of the coating by adjusting the coating thickness;
and S2, curing the coating by temperature programming under normal pressure.
7. The coating method of the carbon nano organic temperature-resistant wave-absorbing coating according to claim 6, characterized in that: in step S1, the substrate coated with the coating layer is one of glass fiber reinforced epoxy resin, phenolic resin, and polyimide.
8. The coating method of the carbon nano organic temperature-resistant wave-absorbing coating according to claim 6, characterized in that: and in the step S1, the base material is sequentially cleaned by ethanol and deionized water and then coated.
9. The coating method of the carbon nano organic temperature-resistant wave-absorbing coating according to claim 6, characterized in that: in the step S2, the curing temperature-rising program is to preserve heat for 30min at 80 ℃; keeping the temperature at 100 ℃ for 20 min; keeping the temperature at 120 ℃ for 30 min; keeping the temperature at 165 ℃ for 150 min; the curing temperature rise rate is 2 ℃/min.
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