A high-temperature resistant fireproof coating applied to the surface of a fire-fighting drone and its preparation method

Abstract

The present invention discloses a high-temperature resistant fireproof coating applied to the surface of a fire-fighting drone and a preparation method thereof. It is composed of AlTaO4‑APP, MOF‑74@BN, filler powder, phosphate and water in a mass ratio of 0.1~0.3:2~4:1~3:1~2:1~2; wherein the filler powder is composed of silicon dioxide, aluminum hydroxide, titanium dioxide and aluminum oxide in a mass ratio of 1~2:1~2:0.5~1:1~1.5. The preparation method is to add filler powder and aluminum dihydrogen phosphate to water, add ATP and MOF‑74@BN, stir and heat, and obtain the high-temperature resistant fireproof coating after the solution becomes gel-like. The high-temperature resistant coating provided by the present invention has good heat dissipation and fireproof performance, is resistant to high temperatures, and can be applied to the surface of the fire-fighting drone fuselage to enable the fire-fighting drone to work normally at a temperature of 1200°C for 30 minutes.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite material coatings, and specifically relates to a high-temperature resistant fireproof coating applied to the surface of a fire-fighting drone and a preparation method thereof. Background Art

[0002] With the rapid development of my country's economy, high-rise buildings, underground structures, urban complexes, large-span structures, and the petrochemical industry have grown rapidly, resulting in a dramatic increase in the number of buildings and the scale of facilities. The risk of fires in these buildings, process facilities, and storage facilities, as well as the difficulty of firefighting, have also increased. This has posed new challenges to firefighting teams' on-site emergency response, communication support, and information acquisition. For example, after a fire breaks out in a high-rise, underground, or large-span building, on-site communications often struggle to cover the entire building. Ground-based image transmission equipment such as satellites and 3G / 4G often only captures fire conditions from a specific angle or side, making it difficult for commanders at all levels to fully and comprehensively grasp and control the overall situation at the disaster site. In petrochemical and hazardous chemical disaster rescue operations, the risk of explosions, poisoning, and corrosion has skyrocketed, posing a significant threat to the safety of rescue personnel. The comprehensive and rapid acquisition of the various investigative information required for on-site command has significantly impacted commanders' decision-making and accurate assessment. Furthermore, major natural disasters such as forest fires affect large areas and are widespread, sudden and destructive. Disasters often damage on-site roads, preventing immediate transmission of information about the disaster situation and making it difficult for rescue workers to reach the affected area. Furthermore, personnel entering the disaster area are prone to losing contact with the outside world, hindering the timely and effective implementation of important emergency response and relief decisions. Currently, the vigorous development of firefighting drone technology is one of the most effective ways to effectively obtain disaster situation information and ensure smooth on-site command and communication.

[0003] For a wide range of firefighting emergency needs, quickly determining the precise status of the incident scene, conducting a swift fire scene assessment, and conducting rescue operations are crucial. The location of the fire must be quickly determined to develop an optimal rescue plan. Drones can assist firefighters and rescue personnel in maximizing the efficiency of rescue operations. Drones offer a wide range of survey and rescue coverage, and their flexible and maneuverable flight maneuvers significantly assist firefighting and rescue efforts. To maximize the effectiveness of firefighting operations, the use of drones is essential for assisting in these tasks.

[0004] However, these drones still have some shortcomings, such as being unable to operate at close range in high temperatures, being unable to take measures to extinguish fires before the disaster escalates, and having a low payload limit, making them difficult to meet the needs of close-range firefighting and rescue operations in high-temperature areas. Firefighting drones, with their high-temperature, heat-insulating, and flame-retardant coatings, can not only gather information, command and dispatch, conduct disaster reconnaissance, and locate and search, but can also respond to fire sources and take targeted measures to extinguish them.

[0005] The present invention aims to provide a high-temperature resistant fire-retardant coating that can be applied to the surface of a fire-fighting drone fuselage. Summary of the Invention

[0006] The first purpose of the present invention is to provide a high temperature resistant fire retardant coating for use on the surface of a fire-fighting drone.

[0007] The second object of the present invention is to provide a method for preparing the high temperature resistant fire retardant coating.

[0008] The first object of the present invention is achieved as follows: a high-temperature resistant fireproof coating applied to the surface of a firefighting drone, comprising AlTaO4-APP, MOF-74@BN, filler powder, phosphate and water in a mass ratio of 0.1-0.3:2-4:1-3:1-2:1-2;

[0009] The filler powder is composed of silicon dioxide, aluminum hydroxide, titanium dioxide and aluminum oxide in a mass ratio of 1-2:1-2:0.5-1:1-1.5.

[0010] The particle sizes of silicon dioxide, aluminum hydroxide, titanium dioxide, aluminum oxide, aluminum tantalate and ammonium polyphosphate powders are 1-50 μm, and the phosphate is aluminum dihydrogen phosphate.

[0011] The preparation method of the filler powder is as follows:

[0012] Weigh silicon dioxide, aluminum hydroxide, titanium dioxide, and aluminum oxide in a certain proportion, add ball milling media and ball milling aids, and perform ball milling. After ball milling, dry at 70-90° C. for 10-20 hours, pass through a 300-mesh sieve, and then calcine at 900° C. for 3 hours. After calcination, cool the powder to room temperature. Filter the washed powder, dry it, and pass it through a 300-mesh sieve to obtain filler powder.

[0013] The second object of the present invention is achieved in this way. The preparation method of the high-temperature resistant fire-retardant coating is to adopt a sol-gel method, add filler powder and aluminum dihydrogen phosphate into water, add ATP and MOF-74@BN, stir and heat, and obtain the high-temperature resistant fire-retardant coating after the solution becomes a gel.

[0014] Silica, aluminum hydroxide, and aluminum oxide, as fillers, have higher melting points, helping to increase the coating's refractory temperature. Aluminum hydroxide, as an amphoteric oxide, partially reacts with aluminum dihydrogen phosphate to form aluminum phosphate, increasing both the refractory temperature and performance stability. The remaining portion, dehydrated as a hydroxide, raises the coating's phase transition temperature. Titanium dioxide, as a curing agent, significantly shortens the coating's curing time, facilitating application, and also catalyzes the early formation of the thermal insulation layer.

[0015] Aluminum tantalate has a small phonon free path and low thermal conductivity. The phosphoric acid released by ammonium polyphosphate during the reaction acts as a high-temperature bonding agent.

[0016] Aluminum tantalate and filler powders are used as a cross-linking framework to improve the coating's antioxidant capacity and mechanical properties. MOF-74@BN is used as a catalyst to accelerate the coating's ceramicization and improve its heat resistance.

[0017] The high-temperature-resistant coating provided by the present invention has excellent heat dissipation and fireproofing properties, and is resistant to high temperatures. When applied to the surface of a firefighting drone, it can operate normally at temperatures of 1200°C for 30 minutes. The preparation method of this high-temperature-resistant coating has the advantages of low synthesis temperature, short reaction time, simple process, easy dispersion, and low cost, making it suitable for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a SEM image of the density of the ceramic carbon layer obtained after the back temperature test of the coating prepared in Example 1 of the present invention for 30 minutes;

[0019] Figure 2 This is a SEM image of the density of the ceramic carbon layer obtained after the back temperature test of the coating prepared in Example 2 of the present invention for 30 minutes;

[0020] Figure 3 This is a SEM image of the density of the ceramic carbon layer obtained after the back temperature test of the coating prepared in Example 3 of the present invention for 30 minutes;

[0021] Figure 4 This is a SEM image of the density of the ceramic carbon layer obtained after the back temperature test of the coating prepared in Example 4 of the present invention for 30 minutes;

[0022] Figure 5 This is a SEM image of the density of the ceramic carbon layer obtained after the back temperature test of the coating prepared in Example 5 of the present invention for 30 minutes;

[0023] Figure 6 This is an SEM image of the density of the ceramic carbon layer obtained after the back temperature test of the coating prepared in Comparative Example 1 of the present invention for 30 minutes;

[0024] Figure 7 This is an SEM image of the density of the ceramic carbon layer obtained after the back temperature test of the coating prepared in Comparative Example 2 of the present invention for 30 minutes;

[0025] Figure 8 These are the thermal insulation curves of the coatings prepared in Examples 1-5 of the present invention and Comparative Examples 1-2. DETAILED DESCRIPTION

[0026] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0027] The present invention discloses a high-temperature resistant fireproof coating applied to the surface of a firefighting drone, comprising AlTaO4-APP, MOF-74@BN, filler powder, phosphate and water in a mass ratio of 0.1-0.3:2-4:1-3:1-2:1-2;

[0028] The filler powder is composed of silicon dioxide, aluminum hydroxide, titanium dioxide and aluminum oxide in a mass ratio of 1-2:1-2:0.5-1:1-1.5.

[0029] The particle sizes of silicon dioxide, aluminum hydroxide, titanium dioxide, aluminum oxide, aluminum tantalate and ammonium polyphosphate powders are 1-50 μm, and the phosphate is aluminum dihydrogen phosphate.

[0030] The preparation method of the filler powder is as follows:

[0031] Weigh silicon dioxide, aluminum hydroxide, titanium dioxide, and aluminum oxide in a certain proportion, add ball milling media and ball milling aids, and perform ball milling. After ball milling, dry at 70-90° C. for 10-20 hours, pass through a 300-mesh sieve, and then calcine at 900° C. for 3 hours. After calcination, cool the powder to room temperature. Filter the washed powder, dry it, and pass it through a 300-mesh sieve to obtain filler powder.

[0032] In step 1), the ball milling medium is anhydrous ethanol, the rotation speed of the ball mill is 300-500 r / min, and the ball milling time is 450-500 min.

[0033] The MOF-74@BN preparation method is as follows: using a hydrothermal method, ferric chloride hexahydrate and 2-methylimidazole are weighed in a molar ratio of 1:1 and added to a hydrothermal reactor, stirred at 120°C for 1 hour until uniform, and hexagonal boron nitride nanosheets are added and stirred for another hour. The mixture is then kept at 120-150°C for 24-28 hours, and then cooled to room temperature. The washed powder is filtered, vacuum-dried, and sieved through 300 mesh to obtain MOF-74@BN. The mass ratio of ferric chloride hexahydrate to BN nanosheets is 1.16:1.

[0034] The AlTaO4-APP preparation method is as follows: using a sol-gel method, aluminum tantalate powder and ammonium polyphosphate powder are weighed in a mass ratio of 1:1 into a conical flask, anhydrous ethanol is used as a solvent, a silane coupling agent KH550 is added, and the mixture is stirred at 50-70°C at a speed of 300-500 r / min for 6-10 hours, then cooled to room temperature, filtered, vacuum dried, and sieved through 300 mesh to obtain AlTaO4-APP;

[0035] The particle sizes of aluminum tantalate and ammonium polyphosphate powders are 1-50 μm.

[0036] The present invention also provides a method for preparing the high-temperature resistant fire-retardant coating applied to the surface of a fire-fighting drone. Specifically, a sol-gel method is adopted, filler powder and aluminum dihydrogen phosphate are added to water, ATP and MOF-74@BN are added, and the mixture is stirred and heated. After the solution becomes a gel, the high-temperature resistant fire-retardant coating is obtained.

[0037] The heating temperature is 70-90°C, the stirring rate is 500-700 r / min, and the stirring time is 60-120 min.

[0038] The present invention further provides an application of the high-temperature resistant fire-retardant coating in the preparation of a surface coating of a fire-fighting drone fuselage material. The preparation method of the surface coating of the fire-fighting drone fuselage material is as follows: after cleaning the stains on the surface of the drone substrate, spray a layer of 30±5µm corundum sand on the surface, and then apply the high-temperature resistant coating on the substrate with a thickness of 70±5μm. The substrate is placed in an oven and dried at a temperature of 60-70°C for 10 to 20 hours, then cooled to room temperature, and cured at room temperature for 20 to 120 hours.

[0039] The fuselage material of the fire-fighting drone is a carbon fiber woven body, a resin-based composite material, or an aluminum alloy.

[0040] Example 1

[0041] 1. Use acetone to remove stains on the surface of the drone, and then use sandblasting equipment to spray a layer of 30±5µm corundum sand to roughen the surface.

[0042] 2. Weigh 0.33 kg of silicon dioxide, 0.33 kg of aluminum hydroxide, 0.17 kg of titanium dioxide and 0.33 kg of aluminum oxide, and place them on a planetary ball mill for ball milling (ball milling speed 400 r / min, ball milling time 500 min). After drying the ball-milled suspension at 85°C for 15 hours, first sieve it through a 300-mesh sieve and then through a 500-mesh sieve to obtain a filler powder.

[0043] 3. Weigh 0.8109 g of ferric nitrate hexahydrate and 0.821 g of 2-methylimidazole into a hydrothermal reactor and stir for 1 h. After stirring until uniform, add 0.7 g of boron nitride nanosheets and stir for another 1 h. Then, keep the mixture at 120-150 ° C for 24 h, and then cool to room temperature. The washed powder is filtered, vacuum-dried, and sieved through 300 mesh to obtain MOF-74@BN.

[0044] 4. Using the sol-gel method, weigh 0.05 kg of aluminum tantalate and 0.05 kg of APP into a conical flask, add 0.5 g of silane coupling agent KH550, add 500 mL of anhydrous ethanol, stir at 400 r / min at 60 ° C for 8 hours, then cool to room temperature, filter, vacuum dry, and sieve through 300 mesh to obtain AlTaO4-APP (ATP).

[0045] 5. Weigh 1kg of filler powder, aluminum dihydrogen phosphate, and deionized water, 1kg of ATP, and 0.2kg of MOF-74@BN. Add the deionized water to a water bath and heat to 85°C. Maintain the heat for 5 minutes to completely dissolve the aluminum dihydrogen phosphate in the water. Stir and mix thoroughly before adding the filler powder, ATP, and MOF-74@BN. Once the solution forms a gel, coat it on a carbon fiber braid (70μ±5μm thick). Dry it in an oven (70°C for 20 hours) and cool to room temperature to obtain the desired fire retardant coating.

[0046] Examples 2-5

[0047] The coating preparation methods of Examples 2-5 are basically the same as those of Example 1, with only some components used in different amounts, as shown in Table 1. Figure 1-5 It can be seen that the coatings prepared in Examples 1-5 have high surface smoothness, good morphology, relatively uniform internal structure, and some small closed pores.

[0048] Table 1 Coating composition content of Examples 1-5

[0049]

[0050] Example 6

[0051] 1. Weigh 100 g of silicon dioxide, 200 g of aluminum hydroxide, 50 g of titanium dioxide and 150 g of aluminum oxide, and place them on a planetary ball mill for ball milling (ball milling speed 300 r / min, ball milling time 450 min). After drying the ball-milled suspension at 70 ° C for 20 hours, first sieve it through a 300 mesh sieve and then through a 500 mesh sieve to obtain a filler powder.

[0052] 2. Using a hydrothermal method, 0.8109 g of ferric nitrate hexahydrate and 0.821 g of 2-methylimidazole were weighed in a molar ratio of 1:1 and added to a hydrothermal reactor, stirred for 1 hour. After stirring until uniform, 0.7 g of boron nitride nanosheets was added and stirred for another 1 hour. The mixture was then kept at 150°C for 24 hours and then cooled to room temperature. The washed powder was filtered, vacuum-dried, and sieved through 300 mesh to obtain MOF-74@BN.

[0053] 3. Using the sol-gel method, 15 g of aluminum tantalate and 15 g of APP were weighed into a conical flask in a mass ratio of 1:1, 0.05 g of silane coupling agent KH550 was added, and 50 mL of anhydrous ethanol was added. The mixture was stirred at 70 ° C and 500 r / min for 6 h, then cooled to room temperature, filtered, vacuum dried, and sieved through 300 mesh to obtain AlTaO4-APP (ATP).

[0054] 4. Weigh 100g of filler powder, 200g of aluminum dihydrogen phosphate, 200g of deionized water, 30g of ATP, and 400g of MOF-74@BN. Add the deionized water to a water bath and heat to 70°C. Keep warm for 5 minutes to completely dissolve the aluminum dihydrogen phosphate in the water. Stir thoroughly and then add the filler powder. When the solution becomes a gel, the target coating is obtained.

[0055] Example 7

[0056] 1. Weigh 200 g of silicon dioxide, 100 g of aluminum hydroxide, 100 g of titanium dioxide and 100 g of aluminum oxide, and place them on a planetary ball mill for ball milling (ball milling speed 400 r / min, ball milling time 480 min). After drying the ball-milled suspension at 90 ° C for 10 hours, first sieve it through a 300 mesh sieve and then through a 500 mesh sieve to obtain a filler powder.

[0057] 2. Using a hydrothermal method, 0.8109 g of ferric nitrate hexahydrate and 0.821 g of 2-methylimidazole were weighed in a molar ratio of 1:1 and added to a hydrothermal reactor and stirred for 1 hour. After stirring until uniform, 0.7 g of boron nitride nanosheets was added and stirred for another 1 hour. The mixture was then kept at 120°C for 28 hours and then cooled to room temperature. The washed powder was filtered, vacuum-dried, and sieved through 300 mesh to obtain MOF-74@BN.

[0058] 3. Using the sol-gel method, 15 g of aluminum tantalate and 15 g of APP were weighed into a conical flask in a mass ratio of 1:1, 0.05 g of silane coupling agent KH550 was added, and 50 mL of anhydrous ethanol was added. The mixture was stirred at 300 r / min at 50 ° C for 10 h, then cooled to room temperature, filtered, vacuum dried, and sieved through 300 mesh to obtain AlTaO4-APP (ATP).

[0059] 4. Weigh 300g of filler powder, 150g of aluminum dihydrogen phosphate, 200g of deionized water, 20g of ATP, and 300g of MOF-74@BN. Add the deionized water to a water bath and heat to 90°C. Keep warm for 5 minutes to completely dissolve the aluminum dihydrogen phosphate in the water. Stir thoroughly and then add the filler powder. When the solution becomes a gel, the target coating is obtained.

[0060] Comparative Example 1

[0061] The difference between Comparative Example 1 and Example 1 is that MOF-74@BN is not added.

[0062] Comparative Example 2

[0063] The difference between Comparative Example 2 and Example 1 is that no AlTaO4-APP is added.

[0064] Test example

[0065] The carbon fiber back temperature and coating back temperature of the fire-fighting drone surface high temperature resistant coating prepared in Examples 1-5 and Comparative Examples 1-2 and the density of the ceramic carbon layer were tested: 3 After cleaning the surface stains of the carbon fiber board, spray a layer of 30±5µm corundum sand on the surface, and then apply the high-temperature resistant coating on the substrate with a thickness of 70±5μm. Place it in an oven and dry it at a temperature of 60-70℃ for 10-20h, then cool it to room temperature and cure it at room temperature for 20-120h. Use a butane flame to test the temperature of the back of the substrate. Use a thermocouple to measure the temperature so that the flame temperature is raised to 1200℃. Adjust the distance between the coated sample surface and the flame tip to 100mm, and use a K-type thermocouple to record the temperature change of the back of the sample, as shown in the figure. Figure 8 .

[0066] Combine Figure 1-8It can be seen that the change in temperature depends on the density and number of defects in the carbon layer. The coating of Example 1 has a high density and no obvious defects, and the thermal insulation capacity of the carbon layer will be significantly improved. However, there are many obvious cracks and holes in the coatings of Examples 2-4, which will make the carbon layer unable to play its thermal insulation role. Heat will be transferred inward through the pores, causing the back temperature to rise. AlTaO4-APP will generate aluminum oxide and aluminum phosphate during the combustion process. As typical refractory particles, it can not only increase the cross-linking degree of the carbon layer but also improve the oxidation resistance of the carbon layer. The tortuosity effect brought by the layered structure of MOF-74@BN and the catalytic carbonization of transition metals can make the carbon layer form earlier. Silicon dioxide, titanium dioxide and aluminum oxide can be used as refractory fillers to increase the oxidation resistance of the carbon layer. The water generated by aluminum hydroxide when heated can also prevent heat from accumulating on the surface and transferring inward. Example 1 is the optimal ratio for different raw material ratios to exert the best synergistic effect.

[0067] Table 2 Back temperature and density of ceramic carbon layer of high temperature resistant coatings prepared in Examples 1-5 and Comparative Examples 1-2 after 30 minutes of testing

[0068] Back temperature (℃) Carbon layer density Example 1 157 Dense-defect-free Example 2 163 There are very few tiny holes Example 3 174 Cracks and holes Example 4 176 Cracks and holes Example 5 226.5 Cracks and holes Comparative Example 1 235.2 Cracks and holes Comparative Example 2 252 There are small holes and cracks

[0069] As can be seen from Table 2, the back temperature of the coating prepared in Example 1-5 after 30 minutes of testing is lower than that of Comparative Example 1-2, and the fire resistance is significantly better than that of Comparative Example 1-2.

[0070] Among them, the carbon layer density and high temperature resistance of the coating of Example 1 are significantly better than the coating components of Comparative Examples 1 and 2. This is because aluminum tantalate has high chemical stability, high thermal stability, and extremely low phonon free path and thermal conductivity. It is organically combined with ammonium polyphosphate through the silicon-oxygen bond generated by KH550, which greatly improves the compatibility with the binder. During the combustion process, a part of the ammonium polyphosphate reacts with aluminum tantalate to generate small particles of aluminum phosphate and aluminum oxide on the surface of the aluminum tantalate. Together, they serve as the cross-linked skeleton of the carbon layer to generate a ceramic carbon layer. The phosphoric acid and metaphosphoric acid generated by the decomposition of another part of the ammonium polyphosphate serve as the cross-linked skeleton of the carbon layer, which greatly improves the cross-linking degree of the carbon layer. Therefore, the combination of aluminum tantalate, ammonium polyphosphate and KH550 can reduce the temperature on the back of the steel plate and improve the density of the ceramic carbon layer. Fe in MOF74@BN acts as an excellent catalyst and can catalyze the early formation of the thermal insulation layer.

Claims

1. A high temperature resistant fire retardant coating applied to the surface of a firefighting drone, characterized in that: It is made of AlTaO4-APP, MOF-74@BN, filler powder, phosphate and water in a mass ratio of 0.1~0.3:2~4:1~3:1~2:1~2; wherein: Preparation of MOF-74@BN: 0.8109 g of ferric nitrate hexahydrate and 0.821 g of 2-methylimidazole were weighed and placed in a hydrothermal reactor, stirred at 120°C for 1 hour, and after stirring until uniform, 0.7 g of boron nitride nanosheets were added and stirred for another 1 hour. The mixture was then kept at 120-150°C for 24 hours and then cooled to room temperature. The washed powder was filtered, vacuum-dried, and sieved through 300 mesh to obtain MOF-74@BN. Preparation of the filler powder: 0.33 kg of silicon dioxide, 0.33 kg of aluminum hydroxide, 0.17 kg of titanium dioxide, and 0.33 kg of aluminum oxide were weighed and ball-milled in a planetary ball mill at a speed of 400 r / min for 500 min. The ball-milled suspension was dried at 85° C. for 15 h, and then passed through a 300-mesh sieve and then a 500-mesh sieve to obtain a filler powder; The phosphate is aluminum dihydrogen phosphate.

2. The high temperature resistant fire retardant coating applied to the surface of a fire-fighting drone according to claim 1, characterized in that: The particle size of silicon dioxide, aluminum hydroxide, titanium dioxide, and aluminum oxide powders is 1 to 50 μm.

3. The high temperature resistant fire retardant coating applied to the surface of a fire-fighting drone according to claim 1, characterized in that: The AlTaO4-APP is prepared by using a sol-gel method, wherein aluminum tantalate powder and ammonium polyphosphate powder are weighed in a mass ratio of 1:1 and placed in a conical flask. Anhydrous ethanol is used as a solvent, and a silane coupling agent KH550 is added. The mixture is stirred at 50-70°C at a speed of 300-500 r / min for 6-10 hours, and then cooled to room temperature. The AlTaO4-APP is obtained after suction filtration, vacuum drying, and sieving through 300 mesh. The particle size of the aluminum tantalate and ammonium polyphosphate powders is 1-50 μm.

4. A method for preparing a high-temperature resistant fireproof coating for use on the surface of a firefighting drone as claimed in any one of claims 1 to 3, characterized in that: By adopting the sol-gel method, filler powder and aluminum dihydrogen phosphate are added into water, AlTaO4-APP and MOF-74@BN are added, and the mixture is stirred and heated. When the solution becomes a gel, the high-temperature resistant fire retardant coating is obtained.

5. The preparation method according to claim 4, characterized in that The heating temperature is 70~90℃, the stirring rate is 500~700r / min, and the stirring time is 60~120min.

6. A use of the high-temperature resistant fireproof coating according to any one of claims 1 to 3 in the preparation of a surface coating on a firefighting drone fuselage material, characterized in that: The preparation method of the surface coating of the fire-fighting drone fuselage material is as follows: after cleaning the stains on the surface of the drone substrate, spray a layer of 30±5µm corundum sand on the surface, and then apply the high-temperature resistant fire-retardant coating on the substrate with a thickness of 70±5μm. Place it in an oven, dry it at a temperature of 60~70℃ for 10~20h, cool it to room temperature, and cure it at room temperature for 20~120h.

7. The use according to claim 6, characterized in that The fuselage material of the fire-fighting drone is a carbon fiber woven body, a resin-based composite material, or an aluminum alloy.

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