High-thermal-conductivity aramid nanofiber composite film

Abstract

The invention discloses a high-thermal-conductivity aramid nanofiber composite film, and relates to the technical field of aramid fiber manufacturing, the high-thermal-conductivity aramid nanofiber composite film comprises 20-50 parts of aramid nanofiber, 30-50 parts of a high-thermal-conductivity material, 10-30 parts of a coating with a visible light and infrared ray synchronous camouflage function, and 5-15 parts of an information encryption function material; the preparation method comprises the following steps: preparing aramid nanofibers, a mixed high-thermal-conductivity material and an information encryption functional material; mixing the mixture with the visible light and infrared ray synchronous camouflage coating material; coating the composite solution on the surface of the aramid nanofiber, and drying to form a film; carrying out heat treatment on the obtained film; and carrying out optical and electromagnetic performance test on the final film. The high-thermal-conductivity aramid nanofiber composite film provided by the invention not only has the advantage of multiple functions, but also can realize high-performance and high-stability integration, has great application potential, and particularly has remarkable application prospects in the aspects of information security, invisible camouflage, efficient thermal management and the like.

Description

Technical Field

[0001] The invention relates to the technical field of aramid fiber manufacturing, and in particular to a high thermal conductivity aramid nanofiber composite film. Background Art

[0002] With the advancement of science and technology, the demand for modern materials is becoming increasingly diversified, especially in the field of high-performance composite materials. Aramid fiber is widely used in engineering and military fields due to its excellent mechanical properties and heat resistance. In order to improve the thermal conductivity, camouflage ability and information security of aramid fiber, it is combined with thermal conductive materials, optical camouflage coatings and information encryption functional materials, which has become a research hotspot for a new type of composite film.

[0003] The introduction of high thermal conductivity materials can effectively improve the thermal conductivity of aramid fibers, while the coating with simultaneous camouflage functions of visible light and infrared rays can provide the composite film with excellent stealth performance, enabling it to hide objects under different lighting conditions. The information encryption functional material gives the composite film the ability to shield and encrypt electromagnetic waves, protecting information from being stolen. By integrating these functional materials through precise processing technology, a new composite film with multiple functions such as optical camouflage, thermal conductivity enhancement and electromagnetic information encryption can be manufactured. Summary of the invention

[0004] In order to solve the above technical problems, a high thermal conductivity aramid nanofiber composite film is provided. This technical solution solves the above problems.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0006] A high thermal conductivity aramid nanofiber composite film, the composite film comprising:

[0007] 20-50 parts of aramid nanofiber, 30-50 parts of high thermal conductivity material, 10-30 parts of coating with simultaneous camouflage function of visible light and infrared rays, and 5-15 parts of information encryption functional material.

[0008] Preferably, the high thermal conductivity material is nanoparticles of thermally conductive material, the information encryption functional material is special polymers and nanoparticles capable of encrypting information, the aramid nanofiber has a diameter of 10-100 nanometers and a length of 500-5000 nanometers, and the thermal conductivity of the composite film is 10-50 W / m·K.

[0009] Preferably, the visible light and infrared synchronous camouflage function of the composite film is achieved through a surface coating, wherein the reflectivity of the coating is 50% to 80% in the visible light range and 80% to 95% in the infrared band range, and the coating is composed of nanomaterials with optical adjustment properties and conductive polymers, and can adjust its reflectivity according to changes in external electric or thermal fields. The information encryption functional material can encrypt external signals at the nanometer level, and the encryption function is achieved by adjusting the electromagnetic properties of the material or using a special polymer embedding technology. The information encryption functional material has an embedded information storage module, which can read and transmit encrypted information under specific environmental conditions.

[0010] Preferably, the composite film preparation method comprises:

[0011] S1. Prepare aramid nanofibers, mix high thermal conductivity materials and information encryption functional materials;

[0012] S2, mixing the mixture with a visible light and infrared ray synchronous camouflage coating material to form a uniformly distributed composite solution;

[0013] S3, coating the composite solution on the surface of the aramid nanofiber and forming a film after drying;

[0014] S4, heat treating the obtained film to improve its thermal conductivity and material stability;

[0015] S5. Conduct optical and electromagnetic performance tests on the final film to ensure that it has the required camouflage and encryption capabilities.

[0016] Preferably, the temperature range of the heat treatment is 150°C to 300°C, the time is 30 minutes to 2 hours, the heat treatment is carried out in an inert gas, the inert gas includes nitrogen and argon, and the heating rate during the heat treatment is controlled at 5-10°C / minute.

[0017] Preferably, the S1 specifically includes:

[0018] Select aramid nanofibers with a diameter of 10-100 nanometers and a length of 500-5000 nanometers;

[0019] Select materials with excellent thermal conductivity, including graphene, carbon nanotubes and metal oxide nanoparticles, with particle sizes controlled within the range of 1-100 nanometers, and pre-treat the high thermal conductivity materials;

[0020] Prepare information encryption functional materials, including nanoparticles, polymers and composites;

[0021] The high thermal conductivity material is mixed with the information encryption functional material, and the mixture is stirred using an ultrasonic dispersion method;

[0022] The prepared aramid nanofibers are mixed with the above-mentioned mixed high thermal conductivity material and information encryption functional material solution in a set ratio to form a uniform composite solution.

[0023] Preferably, S2 specifically includes:

[0024] Select coating materials that have both visible light and infrared camouflage functions, including infrared reflective materials, photochromic materials, and nanostructured optical stealth materials;

[0025] Dissolving the camouflage coating material in a solvent to prepare a uniform coating solution;

[0026] mixing a mixture of aramid nanofibers, a high thermal conductivity material and an information encryption functional material with the prepared camouflage coating solution in a desired proportion;

[0027] According to the coating requirements, the concentration and viscosity of the composite solution are adjusted, and the rheological properties of the solution are monitored using a viscometer;

[0028] Before coating, the uniformity of the composite solution was observed by microscopy;

[0029] Before coating, the composite solution is filtered to remove large particle impurities, and vacuum treatment is used to remove bubbles in the solution to ensure the consistency of the optical and electromagnetic properties of the film.

[0030] Preferably, S3 specifically includes:

[0031] Pre-treating the aramid nanofibers, including surface activation treatment, oxygen plasma treatment, and ultraviolet irradiation, to increase the hydrophilicity or polarity of the aramid surface and enhance the adhesion of the coating material;

[0032] The prepared composite solution is uniformly coated on the surface of the aramid nanofiber, and the operation steps of the coating method include: spin coating, dip coating and scraping coating;

[0033] According to the coating method and the viscosity of the solution, the thickness of the film is controlled by adjusting the coating speed, solution concentration and ambient humidity;

[0034] Drying the coated aramid nanofiber film to remove the solvent and solidify the coating material, and performing preliminary drying by natural air drying at 50°C to 80°C;

[0035] Complete drying is performed at a temperature of 100°C to 150°C to ensure that the residual solvent in the film is completely volatilized.

[0036] Preferably, the S4 specifically includes:

[0037] Before heat treatment, first take the film sample out of the drying environment and make sure that the film is completely dry without any solvent residue;

[0038] The film is placed in a heat treatment furnace for uniform heating. During the heat treatment process, the heated platen is used to arrange the film more closely to improve its thermal conductivity.

[0039] Heat treatment is performed under an inert atmosphere;

[0040] After the heat treatment is completed, the film is slowly cooled, and the sample is taken out and allowed to cool naturally at room temperature.

[0041] Preferably, the S5 specifically includes:

[0042] Use a spectrophotometer to measure the light transmittance of the film at different wavelengths to evaluate the film's stealth capabilities and ensure that it has effective camouflage properties and can provide shielding effects in the visible and infrared ranges;

[0043] Measure the reflectivity and refractive index of the film surface to light, use an infrared thermal imager to detect the infrared radiation characteristics of the film under different temperature conditions, measure the transmittance of the film to electromagnetic waves of different frequencies, measure the reflectivity and absorptivity of electromagnetic waves of the film at different frequencies, and check the stability of the film in different electromagnetic environments.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] The high thermal conductivity aramid nanofiber composite film provided by the present invention not only has the advantages of multiple functions, but also can achieve high performance and high stability integration, and has great application potential, especially in information security, stealth camouflage and efficient thermal management. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a flowchart of the preparation steps of the present invention. DETAILED DESCRIPTION

[0047] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0048] Reference Figure 1 As shown, a high thermal conductivity aramid nanofiber composite film includes: a high thermal conductivity aramid nanofiber composite film, the composite film includes:

[0049] 20-50 parts of aramid nanofiber, 30-50 parts of high thermal conductivity material, 10-30 parts of coating with simultaneous camouflage function of visible light and infrared rays, and 5-15 parts of information encryption functional material.

[0050] The high thermal conductivity material is nanoparticles of thermally conductive materials, the information encryption functional material is special polymers and nanoparticles capable of encrypting information, the aramid nanofiber has a diameter of 10-100 nanometers and a length of 500-5000 nanometers, and the thermal conductivity of the composite film is 10-50 W / m·K.

[0051] The visible light and infrared synchronous camouflage function of the composite film is achieved through a surface coating, wherein the reflectivity of the coating is 50% to 80% in the visible light range and 80% to 95% in the infrared band range. The coating is composed of nanomaterials with optical adjustment properties and conductive polymers, and can adjust its reflectivity according to changes in external electric or thermal fields. The information encryption functional material can encrypt external signals at the nanometer level. The encryption function is achieved by adjusting the electromagnetic properties of the material or using special polymer embedding technology. The information encryption functional material has an embedded information storage module, which can read and transmit encrypted information under specific environmental conditions.

[0052] The composite film preparation method comprises:

[0053] S1. Prepare aramid nanofibers, mix high thermal conductivity materials and information encryption functional materials;

[0054] S2, mixing the mixture with a visible light and infrared ray synchronous camouflage coating material to form a uniformly distributed composite solution;

[0055] S3, coating the composite solution on the surface of the aramid nanofiber and forming a film after drying;

[0056] S4, heat treating the obtained film to improve its thermal conductivity and material stability;

[0057] S5. Conduct optical and electromagnetic performance tests on the final film to ensure that it has the required camouflage and encryption capabilities.

[0058] The temperature range of the heat treatment is 150°C to 300°C, the time is 30 minutes to 2 hours, the heat treatment is carried out in an inert gas, the inert gas includes nitrogen and argon, and the heating rate during the heat treatment is controlled at 5-10°C / minute.

[0059] S1 specifically includes:

[0060] Select aramid nanofibers with a diameter of 10-100 nanometers and a length of 500-5000 nanometers;

[0061] Select materials with excellent thermal conductivity, including graphene, carbon nanotubes and metal oxide nanoparticles, with particle sizes controlled within the range of 1-100 nanometers, and pre-treat the high thermal conductivity materials;

[0062] Prepare information encryption functional materials, including nanoparticles, polymers and composites;

[0063] The high thermal conductivity material is mixed with the information encryption functional material, and the mixture is stirred using an ultrasonic dispersion method;

[0064] The prepared aramid nanofibers are mixed with the above-mentioned mixed high thermal conductivity material and information encryption functional material solution in a set ratio to form a uniform composite solution;

[0065] The high thermal conductivity material added to the composite film can significantly improve the thermal conductivity of the aramid nanofibers, giving them excellent thermal conductivity and can be widely used in thermal management systems, such as heat dissipation and thermal protection of electronic equipment.

[0066] S2 specifically includes:

[0067] Select coating materials that have both visible light and infrared camouflage functions, including infrared reflective materials, photochromic materials, and nanostructured optical stealth materials;

[0068] Dissolving the camouflage coating material in a solvent to prepare a uniform coating solution;

[0069] mixing a mixture of aramid nanofibers, a high thermal conductivity material and an information encryption functional material with the prepared camouflage coating solution in a desired proportion;

[0070] According to the coating requirements, the concentration and viscosity of the composite solution are adjusted, and the rheological properties of the solution are monitored using a viscometer;

[0071] Before coating, the uniformity of the composite solution was observed by microscopy;

[0072] Before coating, the composite solution is filtered to remove large impurities, and the bubbles in the solution are removed by vacuum treatment to ensure the consistency of the optical and electromagnetic properties of the film;

[0073] By introducing a coating with simultaneous camouflage functions for visible light and infrared rays, the composite film can effectively achieve camouflage under different ambient lighting and infrared conditions. In particular, by adjusting the reflectivity of the coating, the invisible effect of the composite film between the visible light and infrared bands can be adjusted as the external environment changes, and it has flexible camouflage capabilities.

[0074] S3 specifically includes:

[0075] Pre-treating the aramid nanofibers, including surface activation treatment, oxygen plasma treatment, and ultraviolet irradiation, to increase the hydrophilicity or polarity of the aramid surface and enhance the adhesion of the coating material;

[0076] The prepared composite solution is uniformly coated on the surface of the aramid nanofiber, and the operation steps of the coating method include: spin coating, dip coating and scraping coating;

[0077] According to the coating method and the viscosity of the solution, the thickness of the film is controlled by adjusting the coating speed, solution concentration and ambient humidity;

[0078] Drying the coated aramid nanofiber film to remove the solvent and solidify the coating material, and performing preliminary drying by natural air drying at 50°C to 80°C;

[0079] Complete drying is performed at a temperature of 100°C to 150°C to ensure that the residual solvent in the film is completely volatilized.

[0080] S4 specifically includes:

[0081] Before heat treatment, first take the film sample out of the drying environment and make sure that the film is completely dry without any solvent residue;

[0082] The film is placed in a heat treatment furnace for uniform heating. During the heat treatment process, the heated platen is used to arrange the film more closely to improve its thermal conductivity.

[0083] Heat treatment is performed under an inert atmosphere;

[0084] After the heat treatment is completed, the film is slowly cooled, and the sample is taken out and allowed to cool naturally at room temperature;

[0085] After the heat treatment process, the thermal conductivity and material stability of the composite film have been significantly improved. Through inert gas heat treatment, it can ensure that the film maintains good mechanical strength and thermal stability in a high temperature environment.

[0086] S5 specifically includes:

[0087] Use a spectrophotometer to measure the light transmittance of the film at different wavelengths to evaluate the film's stealth capabilities and ensure that it has effective camouflage properties and can provide shielding effects in the visible and infrared ranges;

[0088] Measure the reflectivity and refractive index of the film surface to light, use an infrared thermal imager to detect the infrared radiation characteristics of the film under different temperature conditions, measure the transmittance of the film to electromagnetic waves of different frequencies, measure the reflectivity and absorptivity of electromagnetic waves of the film at different frequencies, and check the stability of the film in different electromagnetic environments.

[0089] Embodiment 1:

[0090] S1. Prepare raw materials, including 40 parts of aramid nanofibers, 30 parts of graphene nanoparticles, 20 parts of coating materials with visible light and infrared camouflage functions, and 10 parts of information encryption functional materials, and ensure that all raw materials are evenly mixed;

[0091] S2, mixing the mixture with a coating material having a visible light and infrared ray synchronous camouflage function to form a uniformly distributed composite solution;

[0092] S3, uniformly coating the composite solution on the surface of the aramid nanofibers to form a film after drying;

[0093] S4, heat treating the obtained film to improve its thermal conductivity and material stability, the heat treatment temperature is 200° C., and the heat preservation time is 2 hours;

[0094] S5. Conduct optical and electromagnetic performance tests on the final film to ensure that it has the required camouflage and encryption capabilities. The test results show that the thermal conductivity of the film is 30W / m·K, it has good visible light and infrared simultaneous camouflage functions, and successfully achieves information encryption function.

[0095] Embodiment 2:

[0096] S1. Prepare raw materials, including 30 parts of aramid nanofibers, 35 parts of copper nanoparticles, 25 parts of coating materials with visible light and infrared camouflage functions, and 10 parts of information encryption function materials, and ensure that all raw materials are evenly mixed;

[0097] S2, mixing the mixture with a coating material having a visible light and infrared ray synchronous camouflage function to form a uniformly distributed composite solution;

[0098] S3, uniformly coating the composite solution on the surface of the aramid nanofibers to form a film after drying;

[0099] S4, heat treating the obtained film to improve its thermal conductivity and material stability, the heat treatment temperature is 220° C., and the heat preservation time is 1.5 hours;

[0100] S5. Conduct optical and electromagnetic performance tests on the final film to ensure that it has the required camouflage and encryption capabilities. The test results show that the film has a thermal conductivity of 35W / m·K, has simultaneous camouflage functions for visible light and infrared, and has strong information encryption capabilities.

[0101] Embodiment three:

[0102] S1. Prepare raw materials, including 50 parts of aramid nanofibers, 30 parts of boron nitride nanoparticles, 15 parts of coating materials with visible light and infrared camouflage functions, and 5 parts of information encryption functional materials, and ensure that all raw materials are evenly mixed;

[0103] S2, mixing the mixture with a coating material having a visible light and infrared ray synchronous camouflage function to form a uniformly distributed composite solution;

[0104] S3, uniformly coating the composite solution on the surface of the aramid nanofibers to form a film after drying;

[0105] S4, heat treating the obtained film to improve its thermal conductivity and material stability, the heat treatment temperature is 180° C., and the heat preservation time is 2 hours;

[0106] S5. Conduct optical and electromagnetic performance tests on the final film to ensure that it has the required camouflage and encryption capabilities. The test results show that the thermal conductivity of the film is 28W / m·K, and it has good visible light and infrared simultaneous camouflage functions, and realizes information encryption functions.

[0107] Comparative Example 1:

[0108] S1. Prepare raw materials, including 50 parts of aramid nanofibers, 25 parts of metal oxide nanoparticles, 15 parts of coating materials with visible light and infrared camouflage functions, and 10 parts of information encryption functional materials, and ensure that all raw materials are evenly mixed;

[0109] S2, mixing the mixture with a coating material having a visible light and infrared ray synchronous camouflage function to form a uniformly distributed composite solution;

[0110] S3, uniformly coating the composite solution on the surface of the aramid nanofibers to form a film after drying;

[0111] S4, heat treating the obtained film to improve its thermal conductivity and material stability, the heat treatment temperature is 150° C., and the heat preservation time is 1 hour;

[0112] S5. The final film is subjected to optical and electromagnetic performance tests. The test results show that the thermal conductivity of the film is 18 W / m·K. Although it has the function of simultaneous camouflage of visible light and infrared rays, its information encryption function is not as obvious as other embodiments.

[0113] The following table compares the performance of composite films in different embodiments

[0114]

[0115]

[0116] In summary, the advantages of the present invention are:

[0117] The high thermal conductivity material added to the composite film can significantly improve the thermal conductivity of the aramid nanofiber, making it have excellent thermal conductivity and can be widely used in thermal management systems, such as heat dissipation and thermal protection of electronic equipment.

[0118] By introducing a coating with simultaneous camouflage functions of visible light and infrared rays, the composite film can effectively achieve camouflage under different ambient lighting and infrared conditions. In particular, by adjusting the reflectivity of the coating, the invisible effect of the composite film between the visible light and infrared bands can be adjusted as the external environment changes, and it has flexible camouflage capabilities.

[0119] Information encryption functional materials provide additional electromagnetic shielding and encryption capabilities for composite films. By adjusting electromagnetic properties or using embedding technology, composite films can encrypt signals at the nanometer level to protect information security. Under certain environmental conditions, they can also read and transmit encrypted information to effectively prevent information leakage.

[0120] After the heat treatment process, the thermal conductivity and material stability of the composite film have been significantly improved. Through inert gas heat treatment, it can ensure that the film maintains good mechanical strength and thermal stability in a high temperature environment;

[0121] This composite film not only has enhanced thermal conductivity and excellent camouflage ability, but also integrates information encryption function. It has unique comprehensive advantages and is suitable for wide application in military, aerospace, electronic communications, stealth technology and other fields.

[0122] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A high thermal conductivity aramid nanofiber composite film, characterized in that: Composite films include: 20-50 parts of aramid nanofiber, 30-50 parts of high thermal conductivity material, 10-30 parts of coating with simultaneous camouflage function of visible light and infrared rays, and 5-15 parts of information encryption functional material.

2. The high thermal conductivity aramid nanofiber composite film according to claim 1, characterized in that: The high thermal conductivity material is nanoparticles of thermally conductive materials, the information encryption functional material is special polymers and nanoparticles capable of encrypting information, the aramid nanofiber has a diameter of 10-100 nanometers and a length of 500-5000 nanometers, and the thermal conductivity of the composite film is 10-50 W / m·K.

3. The high thermal conductivity aramid nanofiber composite film according to claim 2, characterized in that: The visible light and infrared synchronous camouflage function of the composite film is achieved through a surface coating, wherein the reflectivity of the coating is 50% to 80% in the visible light range and 80% to 95% in the infrared band range. The coating is composed of nanomaterials with optical adjustment properties and conductive polymers, and can adjust its reflectivity according to changes in external electric or thermal fields. The information encryption functional material can encrypt external signals at the nanometer level. The encryption function is achieved by adjusting the electromagnetic properties of the material or using special polymer embedding technology. The information encryption functional material has an embedded information storage module, which can read and transmit encrypted information under specific environmental conditions.

4. The high thermal conductivity aramid nanofiber composite film according to claim 3, characterized in that: The composite film preparation method comprises: S1. Prepare aramid nanofibers, mix high thermal conductivity materials and information encryption functional materials; S2, mixing the mixture with a visible light and infrared ray synchronous camouflage coating material to form a uniformly distributed composite solution; S3, coating the composite solution on the surface of the aramid nanofiber and forming a film after drying; S4, heat treating the obtained film to improve its thermal conductivity and material stability; S5. Conduct optical and electromagnetic performance tests on the final film to ensure that it has the required camouflage and encryption capabilities.

5. The high thermal conductivity aramid nanofiber composite film according to claim 4, characterized in that: The temperature range of the heat treatment is 150°C to 300°C, the time is 30 minutes to 2 hours, the heat treatment is carried out in an inert gas, the inert gas includes nitrogen and argon, and the heating rate during the heat treatment is controlled at 5-10°C / minute.

6. The high thermal conductivity aramid nanofiber composite film according to claim 5, characterized in that: The S1 specifically includes: Select aramid nanofibers with a diameter of 10-100 nanometers and a length of 500-5000 nanometers; Select materials with excellent thermal conductivity, including graphene, carbon nanotubes and metal oxide nanoparticles, with particle sizes controlled within the range of 1-100 nanometers, and pre-treat the high thermal conductivity materials; Prepare information encryption functional materials, including nanoparticles, polymers and composites; The high thermal conductivity material is mixed with the information encryption functional material, and the mixture is stirred using an ultrasonic dispersion method; The prepared aramid nanofibers are mixed with the above-mentioned mixed high thermal conductivity material and information encryption functional material solution in a set ratio to form a uniform composite solution.

7. The high thermal conductivity aramid nanofiber composite film according to claim 6, characterized in that: The S2 specifically includes: Select coating materials that have both visible light and infrared camouflage functions, including infrared reflective materials, photochromic materials, and nanostructured optical stealth materials; Dissolving the camouflage coating material in a solvent to prepare a uniform coating solution; mixing a mixture of aramid nanofibers, a high thermal conductivity material and an information encryption functional material with the prepared camouflage coating solution in a desired proportion; According to the coating requirements, the concentration and viscosity of the composite solution are adjusted, and the rheological properties of the solution are monitored using a viscometer; Before coating, the uniformity of the composite solution was observed by microscopy; Before coating, the composite solution is filtered to remove large particle impurities, and vacuum treatment is used to remove bubbles in the solution to ensure the consistency of the optical and electromagnetic properties of the film.

8. The high thermal conductivity aramid nanofiber composite film according to claim 7, characterized in that: The S3 specifically includes: Pre-treating the aramid nanofibers, including surface activation treatment, oxygen plasma treatment, and ultraviolet irradiation, to increase the hydrophilicity or polarity of the aramid surface and enhance the adhesion of the coating material; The prepared composite solution is uniformly coated on the surface of the aramid nanofiber, and the operation steps of the coating method include: spin coating, dip coating and scraping coating; According to the coating method and the viscosity of the solution, the thickness of the film is controlled by adjusting the coating speed, solution concentration and ambient humidity; Drying the coated aramid nanofiber film to remove the solvent and solidify the coating material, and performing preliminary drying by natural air drying at 50°C to 80°C; Complete drying is performed at a temperature of 100°C to 150°C to ensure that the residual solvent in the film is completely volatilized.

9. The high thermal conductivity aramid nanofiber composite film according to claim 8, characterized in that: The S4 specifically includes: Before heat treatment, first take the film sample out of the drying environment and make sure that the film is completely dry without any solvent residue; The film is placed in a heat treatment furnace for uniform heating. During the heat treatment process, the heated platen is used to arrange the film more closely to improve its thermal conductivity. Heat treatment is performed under an inert atmosphere; After the heat treatment is completed, the film is slowly cooled, and the sample is taken out and allowed to cool naturally at room temperature.

10. The high thermal conductivity aramid nanofiber composite film according to claim 9, characterized in that: The S5 specifically includes: Use a spectrophotometer to measure the light transmittance of the film at different wavelengths to evaluate the film's stealth capabilities and ensure that it has effective camouflage properties and can provide shielding effects in the visible and infrared ranges; Measure the reflectivity and refractive index of the film surface to light, use an infrared thermal imager to detect the infrared radiation characteristics of the film under different temperature conditions, measure the transmittance of the film to electromagnetic waves of different frequencies, measure the reflectivity and absorptivity of electromagnetic waves of the film at different frequencies, and check the stability of the film in different electromagnetic environments.

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