A method for preparing a resin-based super-amphiphobic anti-corrosion and heat-insulating composite material based on micro-nano structure

Abstract

The present invention discloses a method for preparing a resin-based super-amphiphobic anti-corrosion and heat-insulating composite material based on a micro-nano structure, firstly, nano corrosion-inhibiting particles and heat-insulating particles are fully mixed in epoxy resin and then sprayed on the surface of a metal substrate; then, after it is cured, the super-amphiphobic nanoparticles are fully mixed in epoxy resin and then sprayed on the surface of the above-mentioned material; finally, after it is cured, the preparation of the resin-based super-amphiphobic anti-corrosion and heat-insulating composite material is completed. The resin-based super-amphiphobic anti-corrosion and heat-insulating composite material of the present invention has a complete structure and excellent performance. It not only has excellent liquid repellency but also can realize the precise release of corrosion inhibitors, showing strong advantages in the field of metal corrosion protection and heat insulation in natural environments.

Description

Technical Field

[0001] The invention relates to the technical field of super-amphiphobic anti-corrosion and heat-insulating composite materials, and in particular to a method for preparing a resin-based super-amphiphobic anti-corrosion and heat-insulating composite material based on a micro-nano structure. Background Art

[0002] The energy loss caused by the corrosion of metal materials accounts for about 20% of the total energy consumption in the world every year. Metal corrosion not only brings huge economic losses, but also may endanger people's life safety. Because the liquid repellency of super-hydrophobic materials is highly dependent on liquid properties, liquids with low surface tension are easily spread and wetted on solid surfaces, causing the liquid repellency of artificially constructed super-hydrophobic surfaces to fail, limiting the practical application of super-hydrophobic materials in the field of corrosion protection. Super-amphiphobic materials have liquid repellency to a variety of low surface energy substances (such as oil, organic solvents), can effectively isolate metal substrates from corrosive media, and are more suitable for the field of corrosion protection. At present, super-amphiphobic materials are less for the research of the field of corrosion protection, and the existing super-amphiphobic material preparation methods generally have the problem of poor mechanical stability. Therefore, how to solve the anti-corrosion problem after the super-amphiphobic material is destroyed has become the key of super-amphiphobic materials in the field of corrosion protection.

[0003] The amount of oil and gas loss due to thermal evaporation can reach nearly 1×10 8 Tons, resulting in a large amount of energy being wasted. Thermal insulation materials can effectively reduce the absorption of heat by the surface of the substrate and reduce the ambient temperature inside the substrate, thereby playing a role in heat insulation and cooling. With the continuous efforts of relevant researchers, through the composite utilization of multiple materials, a thermal insulation material that integrates barrier, reflection and radiation has been formed, which has a more excellent thermal insulation effect. However, a single thermal insulation material is difficult to cope with complex and changeable application environments, such as petrochemicals, transportation facilities, aerospace and other fields, which also need to overcome problems such as corrosion resistance, high temperature resistance and coating strength. Therefore, how to solve the durability problem of thermal insulation materials has become the key to whether they can be widely used. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a method for preparing a resin-based super-amphiphobic anti-corrosion and heat-insulating composite material based on a micro-nano structure, which solves the problems mentioned in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for preparing a resin-based super-amphiphobic anti-corrosion and heat-insulating composite material based on a micro-nano structure, comprising the following steps:

[0006] S1. Preparation of nano corrosion inhibition particles: drying the nano-scale halloysite nanotubes, then adding the halloysite nanotubes and the corrosion inhibitor into a beaker for constant temperature magnetic stirring, reacting for a certain period of time, filtering, washing with an organic solvent, and drying to obtain nano corrosion inhibition particles;

[0007] S2. Preparation of anticorrosion and heat-insulating materials: dispersing epoxy resin in an organic solvent under stirring, maintaining the temperature at 60-70° C. and stirring for 0.5-1 h to obtain an epoxy resin dispersion;

[0008] At the same time, the heat-insulating particles and the nano-corrosion-inhibiting particles prepared in step S1 are dispersed in an organic solvent under ultrasonic conditions to prepare a nano-particle suspension;

[0009] The two solutions are mixed and stirred at 40-60° C. for 2-3 hours, and then an epoxy resin curing agent is added, and the mixture is stirred at 40-60° C. for 10-15 minutes to obtain a resin-based nanoparticle suspension; the solution is then sprayed onto the surface of the pretreated metal substrate material using a spray gun, and the anti-corrosion and heat-insulating material is obtained after curing;

[0010] S3. Preparation of super-amphiphobic nanoparticles: After dispersing gas-phase nano-silica in an organic solvent under ultrasonic conditions, adding a low surface energy modification agent under stirring conditions to carry out hydrolysis and condensation reaction, the obtained suspension is filtered, washed with an organic solvent, and dried to obtain super-amphiphobic nanoparticles;

[0011] S4. Preparation of a resin-based super-amphiphobic anticorrosion and heat-insulating composite material based on a micro-nano structure: separately take an epoxy resin and uniformly disperse it in an organic solvent under stirring conditions, keep stirring at 60-70° C. for 0.5-1 h to obtain an epoxy resin suspension;

[0012] Meanwhile, the super-amphiphobic nanoparticles prepared in step S3 are dispersed in an organic solvent under ultrasonic conditions to prepare a super-amphiphobic nanoparticle suspension;

[0013] After blending the above two solutions, keep stirring at 30-40°C for 1-2 hours, then add epoxy resin curing agent, keep stirring at 40-60°C for 10-15 minutes to obtain a uniformly dispersed resin-based super-amphiphobic nanoparticle suspension; then use a spray gun to spray the above solution onto the surface of the anti-corrosion and thermal insulation material prepared in step S2, and after it is completely cured, a resin-based super-amphiphobic anti-corrosion and thermal insulation composite material based on micro-nano structure is obtained.

[0014] Preferably, in step S1, the drying time and temperature of the halloysite nanotubes are 3-5 h and 50-60° C. respectively; the mass ratio of the halloysite nanotubes to the corrosion inhibitor is 1:80-120, and the reaction time and temperature are 2-4 h and 30-40° C. respectively.

[0015] Preferably, the mass concentrations of the nano-corrosion-inhibiting particles and the thermal-insulating particles in the nano-particle suspension of step S2 are 0.02-0.05 g / ml and 0.01-0.02 g / ml, respectively; the mass ratio of the nano-corrosion-inhibiting particles, the thermal-insulating particles, the epoxy resin, and the epoxy resin curing agent in the resin-based nano-particle suspension is 1: 0.3-0.5: 8-10: 1.5-2.

[0016] Preferably, the pretreatment of the metal substrate in step S2 is to polish the surface of the metal base material with 1000-mesh sandpaper, then use acetone and anhydrous ethanol to remove oil and water, and complete the pretreatment after drying; the metal substrate is one of Q235B carbon steel or 2198-T8 aluminum-lithium alloy.

[0017] Preferably, in step S3, the mass ratio of fumed nano-silica to the low surface energy modifier is 1:0.5-0.8; the time and temperature of the hydrolysis condensation reaction are 6-8h and 60-80°C, respectively.

[0018] Preferably, the mass concentration of the super-amphiphobic nanoparticles in the super-amphiphobic nanoparticle suspension of step S4 is 0.05-0.08 g / ml; the mass ratio of the super-amphiphobic nanoparticles, epoxy resin and epoxy resin curing agent in the resin-based super-amphiphobic nanoparticle suspension is 1:4-5:0.8-1.

[0019] Preferably, the corrosion inhibitor is one or both of benzotriazole and imidazoline quaternary ammonium salt; the epoxy resin is one or both of E44 and E51; the heat-insulating particles are one or both of gas-phase nano-silica and hollow glass microspheres; the epoxy resin curing agent is T31; the low surface energy modification agent is 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (FDTS); and the organic solvent is anhydrous ethanol.

[0020] Preferably, in step S2 and step S4, the curing time and temperature are 1-2 h and 70-90° C. respectively; the spraying pressure and distance are 2.0-2.5 MPa and 15-20 cm respectively.

[0021] Preferably, in step S1 and step S3, the filtration and washing times are 3 to 5 times; the drying time and temperature are 1 to 2 hours and 50 to 60° C., respectively.

[0022] Preferably, the ultrasonic dispersion treatment time of the nanoparticles in the organic solvent in step S3 and step S4 is 15 to 30 minutes.

[0023] Preferably, the contact angles of the resin-based super-amphiphobic anti-corrosion and thermal insulation composite material to water, hexadecane and oil are all greater than 150°, and the rolling angles are all less than 10°; the thermal insulation temperature difference is increased by 3°C compared with the bare metal sample; the EIS data is increased by 5 orders of magnitude compared with the bare metal; and after destruction, the EIS data is increased by 1 order of magnitude compared with the bare metal.

[0024] The beneficial effects of the present invention are:

[0025] 1) The composite material of the present invention achieves a super-amphiphobic effect, and the contact angles of water, hexadecane and oil are all greater than 150°, and the rolling angles are all less than 10°. After chemical modification of the gas-phase nano-silicon dioxide, it has a lower surface energy, and a uniform micro-nano structure is formed on the surface of the material by combining the spraying method. The combined effect of the two makes it achieve a super-amphiphobic effect. On the one hand, it provides self-cleaning, anti-pollution and anti-corrosion effects; on the other hand, it also provides excellent protection for the underlying anti-corrosion and heat-insulating materials.

[0026] 2) Excellent anti-corrosion effect of super-amphiphobic materials: The prepared super-amphiphobic materials were tested for anti-corrosion performance using a coating electrochemical evaluation electrolytic cell, and the anti-corrosion performance of the materials was evaluated mainly through electrochemical impedance spectroscopy (EIS) data. The test results are 5 orders of magnitude higher than the EIS data of bare metal.

[0027] 3) When the super-amphiphobic material is broken, the nano-corrosion inhibition particles accurately release the corrosion inhibitor to form a dense protective film to achieve excellent anti-corrosion effect: After the prepared super-amphiphobic anti-corrosion and heat-insulating composite material is broken, the anti-corrosion performance is tested using a coating electrochemical evaluation electrolytic cell, and the anti-corrosion performance of the material is mainly evaluated by electrochemical impedance spectroscopy (EIS) data. The test results are 1 order of magnitude higher than the bare metal EIS data.

[0028] 4) Excellent thermal insulation effect of composite materials: The thermal insulation performance of the prepared super-amphiphobic anti-corrosion thermal insulation composite materials was tested, mainly evaluated by the temperature difference between the upper and lower parts of the material. The test results showed that the thermal insulation temperature difference was 3°C higher than that of the bare metal sample.

[0029] 5) The preparation method of resin-based super-amphiphobic anti-corrosion and thermal insulation composite materials based on micro-nano structure is easy to operate and highly efficient, which is of great significance for the practical engineering application of super-amphiphobic anti-corrosion materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of a resin-based super-amphiphobic anti-corrosion and heat-insulating composite material based on micro-nano structure;

[0031] Figure 2Schematic diagram of the wetting performance test of the resin-based super-amphiphobic anti-corrosion and heat-insulating composite material based on micro-nano structure in the embodiment, (a) is a common optical photograph of different droplets on the surface of the material, (b) is the water contact angle, (c) is the hexadecane contact angle, (d) is the edible oil contact angle, (e) is the water rolling angle, (f) is the hexadecane rolling angle, and (g) is the edible oil rolling angle;

[0032] Figure 3 It is a schematic diagram of the durability test of the resin-based super-amphiphobic anti-corrosion and thermal insulation composite material based on micro-nano structure in the embodiment. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1 The present invention provides a technical solution: a method for preparing a resin-based super-amphiphobic anti-corrosion and heat-insulating composite material based on a micro-nano structure, wherein the prepared composite material has a structure such as Figure 1 As shown in the figure, on the one hand, the surface layer uses super-amphiphobic materials to provide liquid repellency to isolate the corrosive medium and provide protection for the bottom layer; on the other hand, the bottom layer uses nano-insulating particles and nano-corrosion inhibitor particles to provide heat insulation and anti-corrosion ability after the surface layer is damaged. The upper and lower layers cooperate with each other and complement each other to obtain a multifunctional composite material with self-cleaning, heat insulation and strong corrosion resistance. The composite material formed has a complete structure, excellent performance and can achieve the precise release of nano-slow-release particles, showing great advantages in the field of metal corrosion protection and heat insulation in natural environments.

[0035] Solved the anti-corrosion problem after the super-amphiphobic material is damaged: the liquid repellency of the super-amphiphobic material can be used to isolate the corrosive medium and prevent the damage to the metal substrate. Once the material is damaged by the impact of external force, the material will lose its liquid repellency. When the corrosion inhibitor is used alone as an anti-corrosion means, it is often unable to play a long-term anti-corrosion role due to the influence of various external factors. Using it as a backup anti-corrosion means can better play its advantages of strong ability and fast speed. When impacted by external force, the corrosion inhibitor in the material is released to form a protective film on the surface of the metal substrate to continue to hinder the damage of the corrosive medium. The combination of super-amphiphobic material and nano corrosion inhibitor material can achieve long-term anti-corrosion ability.

[0036] Solve the problem of accurate and efficient release of corrosion inhibitors when the damaged part needs it: as a chemical substance, corrosion inhibitors will react with metal substrates to produce a protective film on their surface, so they need to quickly reach the damaged part to produce a protective film when metal damage occurs. Using corrosion inhibitors to modify nanoparticles to prepare nano corrosion inhibitor particles can, on the one hand, be more evenly distributed in epoxy resin, and on the other hand, when corrosion inhibitors are needed, they can be efficiently and accurately released at the damaged part.

[0037] It solves the durability problem of thermal insulation materials when there is a need for thermal insulation: the single application of thermal insulation materials cannot cope with the complex natural environment. After combining them with super-amphiphobic materials, on the one hand, the liquid repellency of super-amphiphobic materials and the anti-corrosion properties of nano-corrosion inhibition materials can be obtained to provide protection for them. On the other hand, composite materials with multiple functions can be obtained, which have broad application prospects in various industrial fields.

[0038] The preparation method of the present invention comprises the following steps: firstly, nano corrosion inhibition particles and heat insulation particles are fully mixed in epoxy resin and then sprayed on the surface of a metal substrate; then, after the epoxy resin is cured, super-amphiphobic nanoparticles are fully mixed in epoxy resin and then sprayed on the surface of the above material; finally, after the epoxy resin is cured, the preparation of the resin-based super-amphiphobic anti-corrosion and heat insulation composite material is completed.

[0039] Example 1

[0040] (1) Preparation of nano-corrosion inhibition particles: First, 10 g of nano-scale halloysite nanotubes were dried in an oven at 55°C for 4 h to keep the halloysite nanotubes completely dry. Then, 180 ml of benzotriazole and 2 g of dried halloysite nanotubes were added to a beaker for constant temperature magnetic heating and stirring, and stirred at 40°C for 3 h. The benzotriazole corrosion inhibitor was filled in the hollow circles of the halloysite nanotubes. Finally, the halloysite nanotubes were filtered out and washed with anhydrous ethanol for 3 times to ensure that the excess benzotriazole was washed away. Then, the nano-sustained-release particles were obtained by drying at 50°C in an oven for 1 h.

[0041] (2) Preparation of anti-corrosion and heat-insulating materials: First, 10g of epoxy resin E44 and 10ml of anhydrous ethanol were added to a beaker for constant temperature magnetic stirring, and the temperature was maintained at 60°C for 0.5h. At the same time, 1g of benzotriazole nano-corrosion inhibition particles and 0.4g of hollow glass microspheres were added to 40ml of anhydrous ethanol for 15min of ultrasonic treatment. Then, the two solutions were mixed and stirred by constant temperature magnetic heating, maintained at 50°C for 2h, and then 2g of T31 curing agent was added to maintain 40°C and continued to stir for 10min. Finally, the stirred solution was added to the air spray gun, and the spraying distance was maintained at 2.5MPa and 15cm. It was sprayed on the pretreated Q235B carbon steel surface, and the anti-corrosion and heat-insulating material was obtained after curing at 80°C for 2h.

[0042] (3) Preparation of super-amphiphobic nanoparticles: First, 4 g of fumed nanosilica and 80 ml of anhydrous ethanol were ultrasonically treated for 15 min, and then 2 g of FDTS was added for constant temperature magnetic stirring, and the temperature was kept at 70°C for 6 h for hydrolysis and condensation reaction. Finally, the obtained suspension was filtered and washed with organic solvent three times and dried in an oven at 55°C for 1 h to obtain super-amphiphobic nanoparticles.

[0043] (4) Preparation of super-amphiphobic anti-corrosion and thermal insulation composite materials based on micro-nano structures: First, 10g of epoxy resin E44 and 10ml of anhydrous ethanol were added to a beaker for constant temperature magnetic stirring, and the mixture was kept at 60°C for 0.5h. At the same time, 2g of super-amphiphobic nanoparticles were added to 40ml of anhydrous ethanol for ultrasonic treatment for 15min. Then, the two solutions were mixed and stirred with constant temperature magnetic heating, kept at 40°C for 2h, and then 2g of T31 curing agent was added and kept at 40°C for 10min. Finally, the stirred solution was added to the air spray gun, and the spraying was carried out at a pressure of 2.5MPa and a spraying distance of 15cm. It was sprayed on the surface of the anti-corrosion and thermal insulation material. After curing at 80°C for 2h, a super-amphiphobic anti-corrosion and thermal insulation composite material based on micro-nano structures was obtained.

[0044] The performance of the obtained micro-nanostructured resin-based super-amphiphobic anti-corrosion and heat-insulating composite material was tested:

[0045] (1) Material wetting performance test: Figure 2 As shown, droplets with different surface energies are respectively dropped on the surface of the prepared super-amphiphobic anti-corrosion and thermal insulation composite material, and a contact angle meter is used to measure the contact angle (SA) and rolling angle (CA) of different droplets on the material surface, so as to determine the super-amphiphobic properties of the prepared material.

[0046] (2) Material stability test-wear resistance test: Figure 3 As shown, after the prepared super-amphiphobic anti-corrosion and heat-insulating composite material was worn a certain number of times under 2000 mesh sandpaper with a load of 10g, a contact angle meter was used to measure the contact angle and rolling angle of water droplets, hexadecane and edible oil droplets, so as to determine the super-amphiphobic performance of the prepared material after high-intensity wear, so as to determine its wear resistance.

[0047] (3) Material thermal insulation performance test: The material is sprayed on a metal substrate and allowed to cure completely. The material is then placed on a 40°C hot plate for 20 minutes to measure the surface temperature change and compare it with the unsprayed metal substrate to test the thermal insulation effect of the micro-nanostructured resin-based super-amphiphobic anti-corrosion and thermal insulation composite material.

[0048] (4) Material corrosion resistance test - electrochemical impedance spectroscopy test (EIS test): In a 3.5 wt% NaCl aqueous solution, a three-electrode system was used, with a platinum electrode as the counter electrode, a KCl electrode as the reference electrode, and a material sample as the working electrode. An EIS test was performed using an electrochemical workstation to determine the electrochemical properties of the prepared material.

[0049] (5) Anti-corrosion performance test after material damage - electrochemical impedance spectroscopy test (EIS test): Use a blade to create damage on the material surface. In a 3.5wt% NaCl aqueous solution, a three-electrode system is used, with a platinum electrode as the counter electrode, a KCl electrode as the reference electrode, and the material sample after damage as the working electrode. An EIS test is performed using an electrochemical workstation to determine the electrochemical properties of the prepared material after damage.

[0050] Example 1 Performance Test Results:

[0051] 1. Material wetting properties: Water droplets, hexadecane droplets, and edible oil droplets were dropped on the surface of the material and measured using a contact angle meter. The water contact angle and the rolling angle of the material were 171.4±0.2° and 1.7±0.2°, the hexadecane contact angle and the rolling angle were 152.3±0.2° and 7.9±0.6°, and the edible oil contact angle and the rolling angle were 157.8±0.3° and 7.1±0.2°, respectively. It can be seen that the prepared resin-based super-amphiphobic anti-corrosion and heat-insulating composite material exhibits excellent super-amphiphobic properties to different droplets and has excellent super-amphiphobic properties.

[0052] 2. Material stability test - wear resistance test: After the material was worn 230 times under 2000 grit sandpaper 10g load conditions, the contact angle of the material to water was 156.3±0.5°, and the rolling angle was 6.5±0.2°; the contact angle to hexadecane was 149.3±0.6°, and the rolling angle was 11.2±0.5°; the contact angle to edible oil was 150.6±0.3°, and the rolling angle was 9.3±0.4°; since the contact angle to hexadecane was less than 150°, it was considered that the material lost its super-amphiphobic performance. The specific implementation process data are shown in Table 1, which shows that the prepared resin-based super-amphiphobic anti-corrosion and heat-insulating composite material still exhibits excellent super-amphiphobic properties to water droplets, edible oil and hexadecane droplets after 200 times of high-intensity wear, and has good wear resistance.

[0053] 3. Material insulation performance test: The test results show that the temperature difference of the sample after surface spraying is 7.2℃, which is 6.8℃ higher than the temperature difference of the unsprayed sample of 0.4℃, showing excellent insulation effect in natural environment.

[0054] 4. Material anti-corrosion performance test - electrochemical impedance spectroscopy test (EIS test): The results show that the material charge transfer resistance Rct = 1.5×10 9 Ωcm2 Compared with the blank Q235 carbon steel matrix (Rct = 7.8 × 10 2 Ωcm 2 ) has been improved by 7 orders of magnitude, showing excellent corrosion resistance.

[0055] 5. Anti-corrosion performance test after material destruction - electrochemical impedance spectroscopy test (EIS test): The results show that the material charge transfer resistance Rct = 2.1×10 5 Ωcm 2 Although it is 4 orders of magnitude lower than that of the undamaged material, it is still 3 orders of magnitude higher than that of the blank Q235 carbon steel matrix, and it can still effectively inhibit the corrosion reaction.

[0056] Example 2

[0057] (1) Preparation of nano corrosion inhibition particles: First, 10g of nano-scale halloysite nanotubes were dried in an oven at 55°C for 4h to keep the halloysite nanotubes completely dry. Then, 240ml of imidazoline quaternary ammonium salt and 2g of dried halloysite nanotubes were added to a beaker for constant temperature magnetic heating and stirring, and stirred at 40°C for 3h. The imidazoline quaternary ammonium salt corrosion inhibitor was filled in the hollow circles of the halloysite nanotubes. Finally, the halloysite nanotubes were filtered out and washed with anhydrous ethanol for 3 times to ensure that the excess imidazoline quaternary ammonium salt was washed away, and then dried in an oven at 50°C for 1h to obtain nano slow-release particles.

[0058] (2) Preparation of anti-corrosion and heat-insulating materials: First, 10g of epoxy resin E44 and 10ml of anhydrous ethanol were added to a beaker for constant temperature magnetic stirring, and the mixture was kept at 60°C for 0.5h. At the same time, 1g of imidazoline quaternary ammonium salt nano-corrosion inhibition particles and 0.4g of hollow glass microspheres were added to 40ml of anhydrous ethanol for 15min of ultrasonic treatment. Then, the two solutions were mixed and stirred with constant temperature magnetic heating, kept at 50°C for 2h, and then 2g of T31 curing agent was added and kept at 40°C for 10min. Finally, the stirred solution was added to an air spray gun, and the spraying was carried out at a pressure of 2.5MPa and a spraying distance of 15cm. It was sprayed on the pretreated 2198-T8 aluminum-lithium alloy surface, and the anti-corrosion and heat-insulating material was obtained after curing at 80°C for 2h.

[0059] (3) Preparation of super-amphiphobic nanoparticles: First, 4 g of fumed nanosilica and 80 ml of anhydrous ethanol were ultrasonically treated for 15 min, and then 2 g of FDTS was added for constant temperature magnetic stirring, and the temperature was kept at 70°C for 6 h for hydrolysis and condensation reaction. Finally, the obtained suspension was filtered and washed with organic solvent three times and dried in an oven at 55°C for 1 h to obtain super-amphiphobic nanoparticles.

[0060] (4) Preparation of super-amphiphobic anti-corrosion and thermal insulation composite materials based on micro-nano structures: First, 10g of epoxy resin E44 and 10ml of anhydrous ethanol were added to a beaker for constant temperature magnetic stirring, and the mixture was kept at 60°C for 0.5h. At the same time, 2g of super-amphiphobic nanoparticles were added to 40ml of anhydrous ethanol for ultrasonic treatment for 15min. Then, the two solutions were mixed and stirred with constant temperature magnetic heating, kept at 40°C for 2h, and then 2g of T31 curing agent was added and kept at 40°C for 10min. Finally, the stirred solution was added to the air spray gun, and the spraying was carried out at a pressure of 2.5MPa and a spraying distance of 15cm. It was sprayed on the surface of the anti-corrosion and thermal insulation material. After curing at 80°C for 2h, a super-amphiphobic anti-corrosion and thermal insulation composite material based on micro-nano structures was obtained.

[0061] The composite material obtained in Example 2 was tested using the same testing methods as in Example 1, and the test results were as follows:

[0062] 1. Material wetting properties: Water droplets, hexadecane droplets, and edible oil droplets were dropped on the surface of the material and measured using a contact angle meter. The water contact angle and the rolling angle of the material were 169.3±0.3° and 2.1±0.4°, the hexadecane contact angle and the rolling angle were 151.6±0.3° and 8.1±0.3°, and the edible oil contact angle and the rolling angle were 156.3±0.5° and 7.6±0.4°, respectively. It can be seen that the prepared resin-based super-amphiphobic anti-corrosion and heat-insulating composite material exhibits excellent super-amphiphobic properties to different droplets and has excellent super-amphiphobic properties.

[0063] 2. Material stability test - wear resistance test: After the material was worn 220 times under 2000-grit sandpaper 10g load conditions, the contact angle of the water was 155.2±0.3°, and the rolling angle was 6.9±0.3°; the contact angle of hexadecane was 149.2±0.3°, and the rolling angle was 12.1±0.3°; the contact angle of edible oil was 151.2±0.3°, and the rolling angle was 8.9±0.3°; since the contact angle of hexadecane was less than 150°, it was considered that the material lost its super-amphiphobic performance. The specific implementation process data are shown in Table 1, which shows that the prepared resin-based super-amphiphobic anti-corrosion and heat-insulating composite material still exhibits excellent super-amphiphobic properties to water droplets, edible oil and hexadecane droplets after 200 times of high-intensity wear, and has good wear resistance.

[0064] 3. Material insulation performance test: The test results show that the temperature difference of the sample after surface spraying is 5.5℃, which is 4.6℃ higher than the temperature difference of the unsprayed sample of 0.9℃, showing excellent insulation effect in natural environment.

[0065] 4. Material anti-corrosion performance test - electrochemical impedance spectroscopy test (EIS test): The results show that the material charge transfer resistance Rct = 7.8×108 Ωcm 2 Compared with the blank 2198-T8 aluminum-lithium alloy matrix (Rct = 3.2 × 10 3 Ωcm 2 ) has been improved by 5 orders of magnitude, showing excellent corrosion resistance.

[0066] 5. Anti-corrosion performance test after material destruction - electrochemical impedance spectroscopy test (EIS test): The results show that the material charge transfer resistance Rct = 3.8×10 4 Ωcm 2 Although it is 4 orders of magnitude lower than that of the undamaged material, it is still 1 order of magnitude higher than that of the blank 2198-T8 aluminum-lithium alloy matrix, and it can still effectively inhibit the corrosion reaction.

[0067] Example 3

[0068] (1) Preparation of nano-corrosion inhibition particles: First, 10 g of nano-scale halloysite nanotubes were dried in an oven at 55°C for 4 h to keep the halloysite nanotubes completely dry. Then, 180 ml of benzotriazole and 2 g of dried halloysite nanotubes were added to a beaker for constant temperature magnetic heating and stirring, and stirred at 40°C for 3 h. The benzotriazole corrosion inhibitor was filled in the hollow circles of the halloysite nanotubes. Finally, the halloysite nanotubes were filtered out and washed with anhydrous ethanol for 3 times to ensure that the excess benzotriazole was washed away. Then, the nano-sustained-release particles were obtained by drying at 50°C in an oven for 1 h.

[0069] (2) Preparation of anti-corrosion and heat-insulating materials: First, 10g of epoxy resin E44 and 10ml of anhydrous ethanol were added to a beaker for constant temperature magnetic stirring, and the mixture was kept at 60°C for 0.5h. At the same time, 1g of benzotriazole nano-corrosion inhibition particles and 0.5g of gas-phase nano-silicon dioxide were added to 40ml of anhydrous ethanol for 15min of ultrasonic treatment. Then, the two solutions were mixed and stirred with constant temperature magnetic heating, kept at 50°C for 2h, and then 2g of T31 curing agent was added and kept at 40°C for 10min. Finally, the stirred solution was added to the air spray gun, and the spraying was carried out at a pressure of 2.5MPa and a spraying distance of 15cm. It was sprayed on the pretreated surface of 2198-T8 aluminum-lithium alloy, and the anti-corrosion and heat-insulating material was obtained after curing at 80°C for 2h.

[0070] (3) Preparation of super-amphiphobic nanoparticles: First, 4 g of fumed nanosilica and 80 ml of anhydrous ethanol were ultrasonically treated for 15 min, and then 2 g of FDTS was added for constant temperature magnetic stirring, and the temperature was kept at 70°C for 6 h for hydrolysis and condensation reaction. Finally, the obtained suspension was filtered and washed with organic solvent three times and dried in an oven at 55°C for 1 h to obtain super-amphiphobic nanoparticles.

[0071] (4) Preparation of super-amphiphobic anti-corrosion and thermal insulation composite materials based on micro-nano structures: First, 10g of epoxy resin E44 and 10ml of anhydrous ethanol were added to a beaker for constant temperature magnetic stirring, and the mixture was kept at 60°C for 0.5h. At the same time, 2g of super-amphiphobic nanoparticles were added to 40ml of anhydrous ethanol for ultrasonic treatment for 15min. Then, the two solutions were mixed and stirred with constant temperature magnetic heating, kept at 40°C for 2h, and then 2g of T31 curing agent was added and kept at 40°C for 10min. Finally, the stirred solution was added to the air spray gun, and the spraying was carried out at a pressure of 2.5MPa and a spraying distance of 15cm. It was sprayed on the surface of the anti-corrosion and thermal insulation material. After curing at 80°C for 2h, a super-amphiphobic anti-corrosion and thermal insulation composite material based on micro-nano structures was obtained.

[0072] The composite material obtained in Example 3 was tested using the same testing methods as in Example 1. The test results were as follows:

[0073] 1. Material wetting properties: Water droplets, hexadecane droplets, and edible oil droplets were dropped on the surface of the material and measured using a contact angle meter. The water contact angle and the rolling angle of the material were 168.9±0.2° and 2.2±0.2°, the hexadecane contact angle and the rolling angle were 152.1±0.3° and 7.6±0.5°, and the edible oil contact angle and the rolling angle were 157.4±0.2° and 6.9±0.3°, respectively. It can be seen that the prepared resin-based super-amphiphobic anti-corrosion and heat-insulating composite material exhibits excellent super-amphiphobic properties to different droplets and has excellent super-amphiphobic properties.

[0074] 2. Material stability test - wear resistance test: After the material was worn 210 times under 2000 grit sandpaper 10g load conditions, the contact angle of the material to water was 156.8±0.4°, and the rolling angle was 6.7±0.2°; the contact angle to hexadecane was 149.7±0.2°, and the rolling angle was 10.6±0.5°; the contact angle to edible oil was 150.8±0.3°, and the rolling angle was 9.4±0.3°; since the contact angle to hexadecane was less than 150°, it was considered that the material lost its super-amphiphobic performance. The specific implementation process data are shown in Table 1, which shows that the prepared resin-based super-amphiphobic anti-corrosion and heat-insulating composite material still exhibits excellent super-amphiphobic properties to water droplets, edible oil and hexadecane droplets after 200 times of high-intensity wear, and has good wear resistance.

[0075] 3. Material insulation performance test: The test results show that the temperature difference of the sample after surface spraying is 4.3℃, which is 3.4℃ higher than the temperature difference of the unsprayed sample of 0.9℃, showing excellent insulation effect in natural environment.

[0076] 4. Material anti-corrosion performance test - electrochemical impedance spectroscopy test (EIS test): The results show that the material charge transfer resistance Rct = 9.2×10 8 Ωcm 2 Compared with the blank 2198-T8 aluminum-lithium alloy matrix (Rct = 3.2 × 10 3 Ωcm 2 ) has been improved by 5 orders of magnitude, showing excellent corrosion resistance.

[0077] 5. Anti-corrosion performance test after material destruction - electrochemical impedance spectroscopy test (EIS test): The results show that the material charge transfer resistance Rct = 3.7×10 5 Ωcm 2 Although it is 3 orders of magnitude lower than that of the undamaged material, it is still 2 orders of magnitude higher than that of the blank 2198-T8 aluminum-lithium alloy matrix, and it can still effectively inhibit the corrosion reaction.

[0078] Example 4

[0079] (1) Preparation of nano corrosion inhibition particles: First, 10g of nano-scale halloysite nanotubes were dried in an oven at 55°C for 4h to keep the halloysite nanotubes completely dry. Then, 240ml of imidazoline quaternary ammonium salt and 2g of dried halloysite nanotubes were added to a beaker for constant temperature magnetic heating and stirring, and stirred at 40°C for 3h. The imidazoline quaternary ammonium salt corrosion inhibitor was filled in the hollow circles of the halloysite nanotubes. Finally, the halloysite nanotubes were filtered out and washed with anhydrous ethanol for 3 times to ensure that the excess imidazoline quaternary ammonium salt was washed away, and then dried in an oven at 50°C for 1h to obtain nano slow-release particles.

[0080] (2) Preparation of anti-corrosion and heat-insulating materials: First, 10g of epoxy resin E44 and 10ml of anhydrous ethanol were added to a beaker for constant temperature magnetic stirring, and the mixture was kept at 60°C for 0.5h. At the same time, 1g of imidazoline quaternary ammonium salt nano-corrosion inhibition particles and 0.5g of gas-phase nano-silica were added to 40ml of anhydrous ethanol for 15min of ultrasonic treatment. Then, the two solutions were mixed and stirred with constant temperature magnetic heating, kept at 50°C for 2h, and then 2g of T31 curing agent was added and kept at 40°C for 10min of stirring. Finally, the stirred solution was added to an air spray gun, and the spraying was carried out at a pressure of 2.5MPa and a spraying distance of 15cm. It was sprayed on the pretreated Q235B carbon steel surface, and the anti-corrosion and heat-insulating material was obtained after curing at 80°C for 2h.

[0081] (3) Preparation of super-amphiphobic nanoparticles: First, 4 g of fumed nanosilica and 80 ml of anhydrous ethanol were ultrasonically treated for 15 min, and then 2 g of FDTS was added for constant temperature magnetic stirring, and the mixture was kept at 70°C for 6 h for hydrolysis and condensation reaction. Finally, the obtained suspension was filtered and washed with an organic solvent three times and dried in an oven at 55°C for 1 h to obtain super-amphiphobic nanoparticles.

[0082] (4) Preparation of super-amphiphobic anti-corrosion and thermal insulation composite materials based on micro-nano structures: First, 10g of epoxy resin E44 and 10ml of anhydrous ethanol were added to a beaker for constant temperature magnetic stirring, and the mixture was kept at 60°C for 0.5h. At the same time, 2g of super-amphiphobic nanoparticles were added to 40ml of anhydrous ethanol for ultrasonic treatment for 15min. Then, the two solutions were mixed and stirred with constant temperature magnetic heating, kept at 40°C for 2h, and then 2g of T31 curing agent was added and kept at 40°C for 10min. Finally, the stirred solution was added to the air spray gun, and the spraying was carried out at a pressure of 2.5MPa and a spraying distance of 15cm. It was sprayed on the surface of the anti-corrosion and thermal insulation material. After curing at 80°C for 2h, a super-amphiphobic anti-corrosion and thermal insulation composite material based on micro-nano structures was obtained.

[0083] The composite material obtained in Example 4 was tested using the same testing methods as in Example 1, and the test results were as follows:

[0084] 1. Material wetting properties: Water droplets, hexadecane droplets, and edible oil droplets were dropped on the surface of the material and measured using a contact angle meter. The water contact angle and the rolling angle of the material were 170.3±0.3° and 1.8±0.3°, the hexadecane contact angle and the rolling angle were 151.9±0.4° and 7.2±0.6°, and the edible oil contact angle and the rolling angle were 156.7±0.4° and 7.1±0.3°, respectively. It can be seen that the prepared resin-based super-amphiphobic anti-corrosion and heat-insulating composite material exhibits excellent super-amphiphobic properties to different droplets and has excellent super-amphiphobic properties.

[0085] 2. Material stability test - wear resistance test: After the material was worn 240 times under 2000-grit sandpaper 10g load conditions, the contact angle to water was 156.6±0.6°, and the rolling angle was 6.5±0.5°; the contact angle to hexadecane was 149.5±0.4°, and the rolling angle was 11.2±0.3°; the contact angle to edible oil was 151.1±0.2°, and the rolling angle was 9.5±0.2°; since the contact angle to hexadecane was less than 150°, it was considered that the material lost its super-amphiphobic properties. The specific implementation process data are shown in Table 1, which shows that the prepared resin-based super-amphiphobic anti-corrosion and heat-insulating composite material still exhibits excellent super-amphiphobic properties to water droplets, edible oil and hexadecane droplets after 200 times of high-intensity wear, and has good wear resistance.

[0086] 3. Material thermal insulation performance test: The test results show that the temperature difference of the sample after surface spraying is 6.6℃, which is 6.2℃ higher than the temperature difference of the unsprayed sample of 0.4℃, showing excellent thermal insulation effect in natural environment.

[0087] 4. Material anti-corrosion performance test - electrochemical impedance spectroscopy test (EIS test): The results show that the material charge transfer resistance Rct = 1.4×10 9 Ωcm 2 Compared with the blank Q235B carbon steel matrix (Rct = 7.8 × 10 2 Ωcm 2 ) has been improved by 7 orders of magnitude, showing excellent corrosion resistance.

[0088] 5. Anti-corrosion performance test after material destruction - electrochemical impedance spectroscopy test (EIS test): The results show that the material charge transfer resistance Rct = 1.9×10 4 Ωcm 2 Although it is 5 orders of magnitude lower than that of the undamaged material, it is still 2 orders of magnitude higher than that of the blank Q235B carbon steel matrix, and it can still effectively inhibit the corrosion reaction.

[0089] Example 5

[0090] (1) Preparation of nano-corrosion inhibition particles: First, 10 g of nano-scale halloysite nanotubes were dried in an oven at 55°C for 4 h to keep the halloysite nanotubes completely dry. Then, 180 ml of benzotriazole and 2 g of dried halloysite nanotubes were added to a beaker for constant temperature magnetic heating and stirring, and stirred at 40°C for 3 h. The benzotriazole corrosion inhibitor was filled in the hollow circles of the halloysite nanotubes. Finally, the halloysite nanotubes were filtered out and washed with anhydrous ethanol for 3 times to ensure that the excess benzotriazole was washed away. Then, the nano-sustained-release particles were obtained by drying at 50°C in an oven for 1 h.

[0091] (2) Preparation of anti-corrosion and heat-insulating materials: First, 8g of epoxy resin E51 and 10ml of anhydrous ethanol were added to a beaker for constant temperature magnetic stirring, and the mixture was kept at 60°C for 0.5h. At the same time, 1g of benzotriazole nano-corrosion inhibition particles and 0.4g of hollow glass microspheres were added to 40ml of anhydrous ethanol for 15min of ultrasonic treatment. Then, the two solutions were mixed and stirred with constant temperature magnetic heating, kept at 50°C for 2h, and then 2g of T31 curing agent was added and kept at 40°C for 10min. Finally, the stirred solution was added to an air spray gun, and the spraying was carried out at a pressure of 2.5MPa and a spraying distance of 15cm. It was sprayed on the pretreated Q235B carbon steel surface, and the anti-corrosion and heat-insulating material was obtained after curing at 80°C for 2h.

[0092] (3) Preparation of super-amphiphobic nanoparticles: First, 4 g of fumed nanosilica and 80 ml of anhydrous ethanol were ultrasonically treated for 15 min, and then 2 g of FDTS was added for constant temperature magnetic stirring, and the temperature was kept at 70°C for 6 h for hydrolysis and condensation reaction. Finally, the obtained suspension was filtered and washed with organic solvent three times and dried in an oven at 55°C for 1 h to obtain super-amphiphobic nanoparticles.

[0093] (4) Preparation of super-amphiphobic anti-corrosion and thermal insulation composite materials based on micro-nano structures: First, 8g of epoxy resin E51 and 10ml of anhydrous ethanol were added to a beaker for constant temperature magnetic stirring, and the mixture was kept at 60°C for 0.5h. At the same time, 2g of super-amphiphobic nanoparticles were added to 40ml of anhydrous ethanol for ultrasonic treatment for 15min. Then, the two solutions were mixed and stirred with constant temperature magnetic heating, kept at 40°C for 2h, and then 2g of T31 curing agent was added and kept at 40°C for 10min. Finally, the stirred solution was added to the air spray gun, and the spraying distance was maintained at 2.5MPa and 15cm. It was sprayed on the surface of the anti-corrosion and thermal insulation material. After curing at 80°C for 2h, a super-amphiphobic anti-corrosion and thermal insulation composite material based on micro-nano structures was obtained.

[0094] The composite material obtained in Example 5 was tested using the same testing methods as in Example 1. The test results were as follows:

[0095] 1. Material wetting properties: Water droplets, hexadecane droplets, and edible oil droplets were dropped on the surface of the material and measured using a contact angle meter. The water contact angle and the rolling angle of the material were 170.8±0.3° and 1.9±0.5°, the hexadecane contact angle and the rolling angle were 151.8±0.2° and 8.2±0.2°, and the edible oil contact angle and the rolling angle were 156.4±0.3° and 7.4±0.2°, respectively. It can be seen that the prepared resin-based super-amphiphobic anti-corrosion and heat-insulating composite material exhibits excellent super-amphiphobic properties to different droplets and has excellent super-amphiphobic properties.

[0096] 2. Material stability test - wear resistance test: After the material was worn 250 times under 2000-grit sandpaper 10g load conditions, the contact angle to water was 154.5±0.3°, and the rolling angle was 7.1±0.3°; the contact angle to hexadecane was 148.9±0.3°, and the rolling angle was 12.5±0.4°; the contact angle to edible oil was 150.9±0.3°, and the rolling angle was 9.2±0.3°; since the contact angle to hexadecane was less than 150°, it was considered that the material lost its super-amphiphobic properties. The specific implementation process data are shown in Table 1, which shows that the prepared resin-based super-amphiphobic anti-corrosion and heat-insulating composite material still exhibits excellent super-amphiphobic properties to water droplets, edible oil and hexadecane droplets after 200 times of high-intensity wear, and has good wear resistance.

[0097] 3. Material insulation performance test: The test results show that the temperature difference of the sample after surface spraying is 8.2℃, which is 7.8℃ higher than the temperature difference of the unsprayed sample of 0.4℃, showing excellent insulation effect in natural environment.

[0098] 4. Material anti-corrosion performance test - electrochemical impedance spectroscopy test (EIS test): The results show that the material charge transfer resistance Rct = 1.8×10 9 Ωcm 2 Compared with the blank Q235B carbon steel matrix (Rct = 7.8 × 10 2 Ωcm 2 ) has been improved by 7 orders of magnitude, showing excellent corrosion resistance.

[0099] 5. Anti-corrosion performance test after material destruction - electrochemical impedance spectroscopy test (EIS test): The results show that the material charge transfer resistance Rct = 2.6×10 5 Ωcm 2 Although it is 4 orders of magnitude lower than that of the undamaged material, it is still 3 orders of magnitude higher than that of the blank Q235B carbon steel matrix, and it can still effectively inhibit the corrosion reaction.

[0100] Example 6

[0101] (1) Preparation of nano corrosion inhibition particles: First, 10g of nano-scale halloysite nanotubes were dried in an oven at 55°C for 4h to keep the halloysite nanotubes completely dry. Then, 240ml of imidazoline quaternary ammonium salt and 2g of dried halloysite nanotubes were added to a beaker for constant temperature magnetic heating and stirring, and stirred at 40°C for 3h. The imidazoline quaternary ammonium salt corrosion inhibitor was filled in the hollow circles of the halloysite nanotubes. Finally, the halloysite nanotubes were filtered out and washed with anhydrous ethanol for 3 times to ensure that the excess imidazoline quaternary ammonium salt was washed away, and then dried in an oven at 50°C for 1h to obtain nano slow-release particles.

[0102] (2) Preparation of anti-corrosion and heat-insulating materials: First, 8g of epoxy resin E51 and 10ml of anhydrous ethanol were added to a beaker for constant temperature magnetic stirring, and the mixture was kept at 60°C for 0.5h. At the same time, 1g of imidazoline quaternary ammonium salt nano-corrosion inhibition particles and 0.4g of hollow glass microspheres were added to 40ml of anhydrous ethanol for 15min of ultrasonic treatment. Then, the two solutions were mixed and stirred with constant temperature magnetic heating, kept at 50°C for 2h, and then 2g of T31 curing agent was added and kept at 40°C for 10min. Finally, the stirred solution was added to an air spray gun, and the spraying was carried out at a pressure of 2.5MPa and a spraying distance of 15cm. It was sprayed on the pretreated 2198-T8 aluminum-lithium alloy surface, and the anti-corrosion and heat-insulating material was obtained after curing at 80°C for 2h.

[0103] (3) Preparation of super-amphiphobic nanoparticles: First, 4 g of fumed nanosilica and 80 ml of anhydrous ethanol were ultrasonically treated for 15 min, and then 2 g of FDTS was added for constant temperature magnetic stirring, and the temperature was kept at 70°C for 6 h for hydrolysis and condensation reaction. Finally, the obtained suspension was filtered and washed with organic solvent three times and dried in an oven at 55°C for 1 h to obtain super-amphiphobic nanoparticles.

[0104] (4) Preparation of super-amphiphobic anti-corrosion and thermal insulation composite materials based on micro-nano structures: First, 8g of epoxy resin E51 and 10ml of anhydrous ethanol were added to a beaker for constant temperature magnetic stirring, and the mixture was kept at 60°C for 0.5h. At the same time, 2g of super-amphiphobic nanoparticles were added to 40ml of anhydrous ethanol for ultrasonic treatment for 15min. Then, the two solutions were mixed and stirred with constant temperature magnetic heating, kept at 40°C for 2h, and then 2g of T31 curing agent was added and kept at 40°C for 10min. Finally, the stirred solution was added to the air spray gun, and the spraying distance was maintained at 2.5MPa and 15cm. It was sprayed on the surface of the anti-corrosion and thermal insulation material. After curing at 80°C for 2h, a super-amphiphobic anti-corrosion and thermal insulation composite material based on micro-nano structures was obtained.

[0105] The composite material obtained in Example 6 was tested using the same testing methods as in Example 1. The test results were as follows:

[0106] 1. Material wetting properties: Water droplets, hexadecane droplets, and edible oil droplets were dropped on the surface of the material and measured using a contact angle meter. The water contact angle of the material was 171.3±0.6°, the rolling angle was 1.7±0.3°, the hexadecane contact angle was 152.2±0.2°, the rolling angle was 7.8±0.3°, and the edible oil contact angle was 157.5±0.3°, the rolling angle was 7.4±0.2°. It can be seen that the prepared resin-based super-amphiphobic anti-corrosion and heat-insulating composite material exhibits excellent super-amphiphobic properties to different droplets and has excellent super-amphiphobic properties.

[0107] 2. Material stability test - wear resistance test: After the material was worn 270 times under 2000-grit sandpaper 10g load conditions, the contact angle to water was 153.2±0.6°, and the rolling angle was 8.2±0.4°; the contact angle to hexadecane was 148.5±0.3°, and the rolling angle was 12.4±0.3°; the contact angle to edible oil was 149.4±0.5°, and the rolling angle was 10.8±0.5°; since the contact angles to hexadecane and edible oil were both less than 150°, it was considered that the material lost its super-amphiphobic properties. The specific implementation process data are shown in Table 1, which shows that the prepared resin-based super-amphiphobic anti-corrosion and heat-insulating composite material still exhibits excellent super-amphiphobic properties to water droplets, edible oil and hexadecane droplets after 200 times of high-intensity wear, and has good wear resistance.

[0108] 3. Material insulation performance test: The test results show that the temperature difference of the sample after surface spraying is 6.4℃, which is 5.5℃ higher than the temperature difference of the unsprayed sample of 0.9℃, showing excellent insulation effect in natural environment.

[0109] 4. Material anti-corrosion performance test - electrochemical impedance spectroscopy test (EIS test): The results show that the material charge transfer resistance Rct = 1.1×10 9 Ωcm 2 Compared with the blank 2198-T8 aluminum-lithium alloy matrix (Rct = 3.2 × 10 3 Ωcm 2 ) has been improved by 6 orders of magnitude, showing excellent corrosion resistance.

[0110] 5. Anti-corrosion performance test after material destruction - electrochemical impedance spectroscopy test (EIS test): The results show that the material charge transfer resistance Rct = 3.3×10 4 Ωcm 2 Although it is reduced by 5 orders of magnitude compared to the undamaged material, it is still increased by 1 order of magnitude compared to the blank 2198-T8 aluminum-lithium alloy matrix, and can still effectively inhibit the corrosion reaction.

[0111] Example 7

[0112] (1) Preparation of nano-corrosion inhibition particles: First, 10 g of nano-scale halloysite nanotubes were dried in an oven at 55°C for 4 h to keep the halloysite nanotubes completely dry. Then, 180 ml of benzotriazole and 2 g of dried halloysite nanotubes were added to a beaker for constant temperature magnetic heating and stirring, and stirred at 40°C for 3 h. The benzotriazole corrosion inhibitor was filled in the hollow circles of the halloysite nanotubes. Finally, the halloysite nanotubes were filtered out and washed with anhydrous ethanol for 3 times to ensure that the excess benzotriazole was washed away. Then, the nano-sustained-release particles were obtained by drying at 50°C in an oven for 1 h.

[0113] (2) Preparation of anti-corrosion and heat-insulating materials: First, 8g of epoxy resin E51 and 10ml of anhydrous ethanol were added to a beaker for constant temperature magnetic stirring, and the mixture was kept at 60°C for 0.5h. At the same time, 1g of benzotriazole nano-corrosion inhibition particles and 0.5g of gas-phase nano-silicon dioxide were added to 40ml of anhydrous ethanol for 15min of ultrasonic treatment. Then, the two solutions were mixed and stirred with constant temperature magnetic heating, kept at 50°C for 2h, and then 2g of T31 curing agent was added and kept at 40°C for 10min. Finally, the stirred solution was added to the air spray gun, and the spraying distance was maintained at 2.5MPa and 15cm. It was sprayed on the pretreated 2198-T8 aluminum-lithium alloy surface, and the anti-corrosion and heat-insulating material was obtained after curing at 80°C for 2h.

[0114] (3) Preparation of super-amphiphobic nanoparticles: First, 4 g of fumed nanosilica and 80 ml of anhydrous ethanol were ultrasonically treated for 15 min, and then 2 g of FDTS was added for constant temperature magnetic stirring, and the temperature was kept at 70°C for 6 h for hydrolysis and condensation reaction. Finally, the obtained suspension was filtered and washed with organic solvent three times and dried in an oven at 55°C for 1 h to obtain super-amphiphobic nanoparticles.

[0115] (4) Preparation of super-amphiphobic anti-corrosion and thermal insulation composite materials based on micro-nano structures: First, 8g of epoxy resin E51 and 10ml of anhydrous ethanol were added to a beaker for constant temperature magnetic stirring, and the mixture was kept at 60°C for 0.5h. At the same time, 2g of super-amphiphobic nanoparticles were added to 40ml of anhydrous ethanol for ultrasonic treatment for 15min. Then, the two solutions were mixed and stirred with constant temperature magnetic heating, kept at 40°C for 2h, and then 2g of T31 curing agent was added and kept at 40°C for 10min. Finally, the stirred solution was added to the air spray gun, and the spraying distance was maintained at 2.5MPa and 15cm. It was sprayed on the surface of the anti-corrosion and thermal insulation material. After curing at 80°C for 2h, a super-amphiphobic anti-corrosion and thermal insulation composite material based on micro-nano structures was obtained.

[0116] The composite material obtained in Example 7 was tested using the same testing methods as in Example 1. The test results were as follows:

[0117] 1. Material wetting properties: Water droplets, hexadecane droplets, and edible oil droplets were dropped on the surface of the material and measured using a contact angle meter. The water contact angle of the material was 170.4±0.2°, the rolling angle was 2.1±0.3°, the hexadecane contact angle was 152.1±0.4°, the rolling angle was 8.1±0.3°, and the edible oil contact angle was 156.8±0.2°, the rolling angle was 7.6±0.2°. It can be seen that the prepared resin-based super-amphiphobic anti-corrosion and heat-insulating composite material exhibits excellent super-amphiphobic properties to different droplets and has excellent super-amphiphobic properties.

[0118] 2. Material stability test - wear resistance test: After the material was worn 260 times under 2000 grit sandpaper 10g load conditions, the contact angle of the material to water was 151.8±0.2°, and the rolling angle was 9.3±0.4°; the contact angle to hexadecane was 148.3±0.5°, and the rolling angle was 13.2±0.2°; the contact angle to edible oil was 149.3±0.5°, and the rolling angle was 10.9±0.5°; since the contact angles to hexadecane and edible oil were both less than 150°, it was considered that the material lost its super-amphiphobic properties. The specific implementation process data are shown in Table 1, which shows that the prepared resin-based super-amphiphobic anti-corrosion and heat-insulating composite material still exhibits excellent super-amphiphobic properties to water droplets, edible oil and hexadecane droplets after 200 times of high-intensity wear, and has good wear resistance.

[0119] 3. Material thermal insulation performance test: The test results show that the temperature difference of the sample after surface spraying is 5.3℃, which is 4.4℃ higher than the temperature difference of the unsprayed sample of 0.9℃, showing excellent thermal insulation effect in natural environment.

[0120] 4. Material anti-corrosion performance test - electrochemical impedance spectroscopy test (EIS test): The results show that the material charge transfer resistance Rct = 1.2×10 9 Ωcm 2 Compared with the blank 2198-T8 aluminum-lithium alloy matrix (Rct = 3.2 × 10 3 Ωcm 2 ) has been improved by 6 orders of magnitude, showing excellent corrosion resistance.

[0121] 5. Anti-corrosion performance test after material destruction - electrochemical impedance spectroscopy test (EIS test): The results show that the material charge transfer resistance Rct = 3.2×10 5 Ωcm 2 Although it is 4 orders of magnitude lower than that of the undamaged material, it is still 2 orders of magnitude higher than that of the blank 2198-T8 aluminum-lithium alloy matrix, and it can still effectively inhibit the corrosion reaction.

[0122] Example 8

[0123] (1) Preparation of nano corrosion inhibition particles: First, 10g of nano-scale halloysite nanotubes were dried in an oven at 55°C for 4h to keep the halloysite nanotubes completely dry. Then, 240ml of imidazoline quaternary ammonium salt and 2g of dried halloysite nanotubes were added to a beaker for constant temperature magnetic heating and stirring, and stirred at 40°C for 3h. The imidazoline quaternary ammonium salt corrosion inhibitor was filled in the hollow circles of the halloysite nanotubes. Finally, the halloysite nanotubes were filtered out and washed with anhydrous ethanol for 3 times to ensure that the excess imidazoline quaternary ammonium salt was washed away, and then dried in an oven at 50°C for 1h to obtain nano slow-release particles.

[0124] (2) Preparation of anti-corrosion and heat-insulating materials: First, 8g of epoxy resin E51 and 10ml of anhydrous ethanol were added to a beaker for constant temperature magnetic stirring, and the mixture was kept at 60°C for 0.5h. At the same time, 1g of imidazoline quaternary ammonium salt nano-corrosion inhibition particles and 0.5g of gas-phase nano-silica were added to 40ml of anhydrous ethanol for 15min of ultrasonic treatment. Then, the two solutions were mixed and stirred with constant temperature magnetic heating, kept at 50°C for 2h, and then 2g of T31 curing agent was added and kept at 40°C for 10min of stirring. Finally, the stirred solution was added to an air spray gun, and the spraying was carried out at a pressure of 2.5MPa and a spraying distance of 15cm. It was sprayed on the pretreated Q235B carbon steel surface, and the anti-corrosion and heat-insulating material was obtained after curing at 80°C for 2h.

[0125] (3) Preparation of super-amphiphobic nanoparticles: First, 4 g of fumed nanosilica and 80 ml of anhydrous ethanol were ultrasonically treated for 15 min, and then 2 g of FDTS was added for constant temperature magnetic stirring, and the mixture was kept at 70°C for 6 h for hydrolysis and condensation reaction. Finally, the obtained suspension was filtered and washed with an organic solvent three times and dried in an oven at 55°C for 1 h to obtain super-amphiphobic nanoparticles.

[0126] (4) Preparation of super-amphiphobic anti-corrosion and thermal insulation composite materials based on micro-nano structures: First, 8g of epoxy resin E51 and 10ml of anhydrous ethanol were added to a beaker for constant temperature magnetic stirring, and the mixture was kept at 60°C for 0.5h. At the same time, 2g of super-amphiphobic nanoparticles were added to 40ml of anhydrous ethanol for ultrasonic treatment for 15min. Then, the two solutions were mixed and stirred with constant temperature magnetic heating, kept at 40°C for 2h, and then 2g of T31 curing agent was added and kept at 40°C for 10min. Finally, the stirred solution was added to the air spray gun, and the spraying distance was maintained at 2.5MPa and 15cm. It was sprayed on the surface of the anti-corrosion and thermal insulation material. After curing at 80°C for 2h, a super-amphiphobic anti-corrosion and thermal insulation composite material based on micro-nano structures was obtained.

[0127] The composite material obtained in Example 8 was tested using the same testing methods as in Example 1. The test results were as follows:

[0128] 1. Material wetting properties: Water droplets, hexadecane droplets, and edible oil droplets were dropped on the surface of the material and measured using a contact angle meter. The water contact angle and the rolling angle of the material were 170.9±0.2° and 1.8±0.2°, the hexadecane contact angle and the rolling angle were 152.1±0.4° and 7.6±0.5°, and the edible oil contact angle and the rolling angle were 157.1±0.4° and 7.5±0.3°, respectively. It can be seen that the prepared resin-based super-amphiphobic anti-corrosion and heat-insulating composite material exhibits excellent super-amphiphobic properties to different droplets and has excellent super-amphiphobic properties.

[0129] 2. Material stability test - wear resistance test: After the material was worn 250 times under 2000-grit sandpaper 10g load conditions, the contact angle to water was 153.2±0.4°, and the rolling angle was 8.9±0.5°; the contact angle to hexadecane was 149.3±0.2°, and the rolling angle was 11.8±0.4°; the contact angle to edible oil was 151.1±0.3°, and the rolling angle was 8.6±0.2°; since the contact angle to hexadecane was less than 150°, it was considered that the material lost its super-amphiphobic properties. The specific implementation process data are shown in Table 1, which shows that the prepared resin-based super-amphiphobic anti-corrosion and heat-insulating composite material still exhibits excellent super-amphiphobic properties to water droplets, edible oil and hexadecane droplets after 200 times of high-intensity wear, and has good wear resistance.

[0130] 3. Material thermal insulation performance test: The test results show that the temperature difference of the sample after surface spraying is 7.5℃, which is 7.1℃ higher than the temperature difference of the unsprayed sample of 0.4℃, showing excellent thermal insulation effect in natural environment.

[0131] 4. Material anti-corrosion performance test - electrochemical impedance spectroscopy test (EIS test): The results show that the material charge transfer resistance Rct = 1.7×10 9 Ωcm 2 Compared with the blank Q235B carbon steel matrix (Rct = 7.8 × 10 2 Ωcm 2 ) has been improved by 7 orders of magnitude, showing excellent corrosion resistance.

[0132] 5. Anti-corrosion performance test after material destruction - electrochemical impedance spectroscopy test (EIS test): The results show that the material charge transfer resistance Rct = 2.3×10 4 Ωcm 2 Although it is 5 orders of magnitude lower than that of the undamaged material, it is still 2 orders of magnitude higher than that of the blank Q235B carbon steel matrix, and it can still effectively inhibit the corrosion reaction.

[0133] Table 1 Wear resistance test implementation process data of Example 1-Implementation 8

[0134]

[0135] Comparative Example 1

[0136] The preparation method is exactly the same as that of Example 1 except that the reaction time of the corrosion inhibitor and the halloysite nanotubes is reduced from stirring at 40°C for 3h to stirring at 40°C for 1h. The performance test method of the micro-nanostructured resin-based super-amphiphobic anti-corrosion and heat-insulating composite material prepared in Comparative Example 1 is the same as that of Example 1, and the test results are as follows:

[0137] Since only the reaction time between the corrosion inhibitor and the halloysite nanotubes is reduced, the wettability, wear resistance, thermal insulation and anti-corrosion performance of the material before the material is destroyed are almost unaffected. Anti-corrosion performance test after material destruction - electrochemical impedance spectroscopy test (EIS test): The results show that the material charge transfer resistance Rct = 4.2×10 4 Ωcm 2 , compared with the charge transfer resistance Rct of Example 1 = 2.1 × 10 5 Ωcm 2 Reduced by an order of magnitude.

[0138] Comparative Example 2

[0139] The preparation method is exactly the same as that of Example 1 except that the amount of the nano corrosion inhibition particles added is reduced from 1g to 0.5g. The performance test method of the resin-based super-amphiphobic anti-corrosion and heat-insulating composite material based on micro-nano structure prepared in Comparative Example 1 is the same as that of Example 1, and the test results are as follows:

[0140] Since only the amount of nano slow-release particles added was reduced, the wettability, wear resistance, heat insulation and corrosion resistance of the material before damage were almost unaffected. Anti-corrosion performance test after material damage - electrochemical impedance spectroscopy test (EIS test): The results showed that the material charge transfer resistance Rct = 1.9×10 4 Ωcm 2 , compared with the charge transfer resistance Rct of Example 1 = 2.1 × 10 5 Ωcm 2 Reduced by an order of magnitude.

[0141] Comparative Example 3

[0142] The preparation method is exactly the same as that of Example 1 except that the amount of the nano corrosion inhibition particles added is increased from 1g to 2g. The performance test method of the resin-based super-amphiphobic anti-corrosion and heat-insulating composite material based on micro-nano structure prepared in Comparative Example 1 is the same as that of Example 1, and the test results are:

[0143] Since only the amount of nano slow-release particles is increased, the thermal insulation and anti-corrosion properties of the material before damage are almost unaffected. The wetting properties of the material are 162.4±0.4° for water contact angle and 3.8±0.3° for rolling angle, 150.8±0.3° for hexadecane contact angle and 9.2±0.3° for rolling angle, and 152.8±0.3° for edible oil contact angle and 8.1±0.2° for rolling angle. The wear resistance of the material is that it loses its super-amphiphobic properties after 50 cycles of wear. Anti-corrosion performance test after damage - electrochemical impedance spectroscopy test (EIS test): The results show that the charge transfer resistance of the material Rct = 2.4×10 5 Ωcm 2 , although compared with the charge transfer resistance Rct=2.1×10 5 Ωcm 2 There is a certain improvement, but the wettability and wear resistance of the material in Example 1 are both reduced compared with Example 1.

[0144] From the test results of Comparative Example 1, Comparative Example 2, and Comparative Example 3, it can be seen that when the reaction time of the corrosion inhibitor and the halloysite nanotubes is reduced or the addition amount of the nano slow-release particles is reduced, the anti-corrosion performance after the coating is destroyed decreases. This is because less reaction time allows a smaller amount of corrosion inhibitor to be encapsulated into the halloysite nanotubes and the nano slow-release particles in the material are less. When the corrosion inhibitor is required to be released to the damaged part, the lower corrosion inhibitor concentration cannot effectively prevent the occurrence of corrosion reaction. Although the anti-corrosion performance is improved to some extent after increasing the addition amount of the nano slow-release example, the addition of too many nanoparticles has a greater impact on the bonding interface of the composite material, which ultimately causes the super-amphiphobicity and wear resistance of the surface to decrease. It can be obtained that the effect of the slow-release agent needs to be at a certain concentration to play a good anti-corrosion effect and does not affect the performance of other functional materials.

[0145] Comparative Example 4

[0146] The preparation method is exactly the same as that of Example 1 except that the modification reaction time of the super-amphiphobic nanoparticles is reduced from 6 hours to 2 hours. The performance test method of the resin-based super-amphiphobic anti-corrosion and heat-insulating composite material based on micro-nano structure prepared in Comparative Example 1 is the same as that of Example 1, and the test results are:

[0147] Since only the modification reaction time of the super-amphiphobic nanoparticles is reduced, the thermal insulation and anti-corrosion performance of the material after the material is destroyed are almost unaffected. The wetting performance of the material is 159.3±0.2° for water contact angle and 5.4±0.3° for rolling angle, 143.5±0.3° for hexadecane contact angle and 16.2±0.4° for rolling angle, and 148.6±0.2° for edible oil contact angle and 11.3±0.2° for rolling angle. The contact angles for hexadecane and edible oil are less than 150°, and the material no longer has super-amphiphobic performance. Material anti-corrosion performance test - electrochemical impedance spectroscopy test (EIS test): The results show that the material charge transfer resistance Rct = 8.2×10 7 Ωcm 2 , compared with the charge transfer resistance Rct=1.5×10 9 Ωcm 2 There is a certain decline. Even though the material still has excellent corrosion resistance, it no longer has super amphiphilic properties.

[0148] From the test results of Comparative Example 4, it can be seen that when the modification time of the super-amphiphobic nanoparticles is reduced, the wettability and anti-corrosion performance of the material decrease. This is because the shorter reaction time cannot make more gas-phase nano-silica particles become super-amphiphobic nanoparticles through modification, and the surface energy of the prepared material is higher than that of Example 1, and the liquid repellency to water and oil is worse. It can be obtained that the liquid repellency of the super-amphiphobic material requires sufficient reaction between the nanoparticles and the modifier.

[0149] Comparative Example 5

[0150] The preparation method is exactly the same as that of Example 1 except that the amount of super-amphiphobic nanoparticles added is reduced from 2g to 1g. The performance test method of the resin-based super-amphiphobic anti-corrosion and heat-insulating composite material based on micro-nano structure prepared in Comparative Example 1 is the same as that of Example 1, and the test results are:

[0151] Since only the amount of super-amphiphobic nanoparticles added is reduced, the thermal insulation of the material and the anti-corrosion performance after the material is destroyed are almost unaffected. The wetting performance of the material is 130.2±0.5° for water contact angle and 20.4±0.5° for rolling angle, 110.3±0.8° for hexadecane contact angle and 32.2±0.7° for rolling angle, and 116.2±0.4° for edible oil contact angle and 28.9±0.5° for rolling angle. The contact angles for water, hexadecane and edible oil are all less than 150°, and the material no longer has super-amphiphobic performance. Material anti-corrosion performance test - electrochemical impedance spectroscopy test (EIS test): The results show that the material charge transfer resistance Rct = 4.3×10 6 Ωcm 2 , compared with the charge transfer resistance Rct=1.5×10 9 Ωcm 2There is a certain decline. Even if the material still has a certain degree of corrosion resistance, it no longer has super amphiphilic properties.

[0152] Comparative Example 6

[0153] The preparation method is exactly the same as that of Example 1 except that the amount of super-amphiphobic nanoparticles added is increased from 2g to 3g. The performance test method of the resin-based super-amphiphobic anti-corrosion and heat-insulating composite material based on micro-nano structure prepared in Comparative Example 1 is the same as that of Example 1, and the test results are:

[0154] Since only the amount of super-amphiphobic nanoparticles added is increased, the thermal insulation of the material and the anti-corrosion performance after the material is destroyed are almost unaffected. The wetting performance of the material is 168.4±0.3° for water contact angle and 1.7±0.2° for rolling angle, 152.1±0.4° for hexadecane contact angle and 7.9±0.3° for rolling angle, and 157.3±0.2° for edible oil contact angle and 6.9±0.3° for rolling angle. The wear resistance of the material is that it loses its super-amphiphobic performance after 100 cycles of wear. Material anti-corrosion performance test - electrochemical impedance spectroscopy test (EIS test): The results show that the material charge transfer resistance Rct = 2.1×10 9 Ωcm 2 , although compared with the charge transfer resistance Rct=1.5×10 9 Ωcm 2 There is some improvement, but the wear resistance of the material in comparative example 1 is somewhat reduced compared to that in example 1.

[0155] It can be seen from the test results of Comparative Examples 5 and 6 that when the amount of super-double-sparse nanoparticles added is reduced, the wettability and anti-corrosion performance of the material decrease. This is because the mass ratio of super-double-sparse nanoparticles and epoxy resin decreases, so that more epoxy resin is coated on the surface of the nanoparticles and cannot form a uniform and effective micro-nano structure. When the amount of super-double-sparse nanoparticles added increases, the wear resistance of the material decreases. This is because too little epoxy resin cannot form a stable rough structure, and it is more easily destroyed when impacted by external forces. The organic combination of wettability, wear resistance, and anti-corrosion performance of the super-double-sparse material thus obtained requires super-double-sparse nanoparticles and epoxy resin to be within a specific ratio range.

[0156] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a resin-based super-amphiphobic anti-corrosion and heat-insulating composite material based on a micro-nano structure, characterized in that: The steps include: S1. Preparation of nano corrosion inhibition particles: drying the nano-scale halloysite nanotubes, then adding the halloysite nanotubes and the corrosion inhibitor into a beaker for constant temperature magnetic stirring, reacting for a certain period of time, filtering, washing with an organic solvent, and drying to obtain nano corrosion inhibition particles; S2. Preparation of anticorrosion and heat-insulating materials: dispersing epoxy resin in an organic solvent under stirring, maintaining the temperature at 60-70° C. and stirring for 0.5-1 h to obtain an epoxy resin dispersion; At the same time, the heat-insulating particles and the nano-corrosion-inhibiting particles prepared in step S1 are dispersed in an organic solvent under ultrasonic conditions to prepare a nano-particle suspension; The two solutions are mixed and stirred at 40-60° C. for 2-3 hours, and then an epoxy resin curing agent is added, and the mixture is stirred at 40-60° C. for 10-15 minutes to obtain a resin-based nanoparticle suspension; the solution is then sprayed onto the surface of the pretreated metal substrate material using a spray gun, and the anti-corrosion and heat-insulating material is obtained after curing; S3. Preparation of super-amphiphobic nanoparticles: After dispersing gas-phase nano-silica in an organic solvent under ultrasonic conditions, adding a low surface energy modification agent under stirring conditions to carry out hydrolysis and condensation reaction, the obtained suspension is filtered, washed with an organic solvent, and dried to obtain super-amphiphobic nanoparticles; S4. Preparation of a resin-based super-amphiphobic anticorrosion and heat-insulating composite material based on a micro-nano structure: separately take an epoxy resin and uniformly disperse it in an organic solvent under stirring conditions, keep stirring at 60-70° C. for 0.5-1 h to obtain an epoxy resin suspension; Meanwhile, the super-amphiphobic nanoparticles prepared in step S3 are dispersed in an organic solvent under ultrasonic conditions to prepare a super-amphiphobic nanoparticle suspension; After blending the above two solutions, keep stirring at 30-40°C for 1-2 hours, then add epoxy resin curing agent, keep stirring at 40-60°C for 10-15 minutes to obtain a uniformly dispersed resin-based super-amphiphobic nanoparticle suspension; then use a spray gun to spray the above solution onto the surface of the anti-corrosion and thermal insulation material prepared in step S2, and after it is completely cured, a resin-based super-amphiphobic anti-corrosion and thermal insulation composite material based on micro-nano structure is obtained.

2. The method for preparing the resin-based super-amphiphobic anticorrosion and heat-insulating composite material based on micro-nano structure according to claim 1, characterized in that: In step S1, the drying time and temperature of the halloysite nanotubes are 3-5 hours and 50-60°C respectively; the mass ratio of the halloysite nanotubes to the corrosion inhibitor is 1:80-120, and the reaction time and temperature are 2-4 hours and 30-40°C respectively.

3. The method for preparing the resin-based super-amphiphobic anti-corrosion and heat-insulating composite material based on micro-nano structure according to claim 1, characterized in that: The mass concentrations of the nano-corrosion inhibition particles and the thermal insulation particles in the nano-particle suspension of step S2 are 0.02-0.05 g / ml and 0.01-0.02 g / ml respectively; the mass ratio of the nano-corrosion inhibition particles, thermal insulation particles, epoxy resin and epoxy resin curing agent in the resin-based nano-particle suspension is 1:0.3-0.5:8-10:1.5-2.

4. The method for preparing the resin-based super-amphiphobic anticorrosion and heat-insulating composite material based on micro-nano structure according to claim 1, characterized in that: The pretreatment of the metal substrate in step S2 is to polish the surface of the metal base material with 1000-mesh sandpaper, then use acetone and anhydrous ethanol to remove oil and water, and complete the pretreatment after drying; the metal substrate is one of Q235B carbon steel or 2198-T8 aluminum-lithium alloy.

5. The method for preparing the resin-based super-amphiphobic anti-corrosion and heat-insulating composite material based on micro-nano structure according to claim 1, characterized in that: In step S3, the mass ratio of gas-phase nano-silica to low surface energy modifier is 1:0.5-0.8; the time and temperature of the hydrolysis condensation reaction are 6-8h and 60-80°C, respectively.

6. The method for preparing the resin-based super-amphiphobic anticorrosion and heat-insulating composite material based on micro-nano structure according to claim 1, characterized in that: The mass concentration of the super-amphiphobic nanoparticles in the super-amphiphobic nanoparticle suspension of step S4 is 0.05-0.08 g / ml; the mass ratio of the super-amphiphobic nanoparticles, epoxy resin and epoxy resin curing agent in the resin-based super-amphiphobic nanoparticle suspension is 1:4-5:0.8-1.

7. The method for preparing the resin-based super-amphiphobic anticorrosion and heat-insulating composite material based on micro-nano structure according to claim 1, characterized in that: The corrosion inhibitor is one or both of benzotriazole and imidazoline quaternary ammonium salt; the epoxy resin is one or both of E44 and E51; the heat-insulating particles are one or both of gas-phase nano-silica and hollow glass microspheres; the epoxy resin curing agent is T31; the low surface energy modification agent is 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (FDTS); and the organic solvent is anhydrous ethanol.

8. The method for preparing the resin-based super-amphiphobic anticorrosion and heat-insulating composite material based on micro-nano structure according to claim 1, characterized in that: In step S2 and step S4, the curing time and temperature are 1-2 hours and 70-90° C. respectively; the spraying pressure and distance are 2.0-2.5 MPa and 15-20 cm respectively.

9. The method for preparing the resin-based super-amphiphobic anticorrosion and heat-insulating composite material based on micro-nano structure according to claim 1, characterized in that: In step S1 and step S3, the filtration and washing times are 3 to 5 times; the drying time and temperature are 1 to 2 hours and 50 to 60° C., respectively.

10. The method for preparing the resin-based super-amphiphobic anticorrosion and heat-insulating composite material based on micro-nano structure according to claim 1, characterized in that: The contact angles of the resin-based super-amphiphobic anti-corrosion and thermal insulation composite material to water, hexadecane and oil are all greater than 150°, and the rolling angles are all less than 10°; compared with the bare metal sample, the thermal insulation temperature difference is increased by 3°C; compared with the bare metal, the EIS data is increased by 5 orders of magnitude; after destruction, the EIS data is increased by 1 order of magnitude compared with the bare metal.

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