Modified waste white clay synthetic super-hydrophobic thermal management composite coating and preparation method thereof

Abstract

A modified waste clay synthetic super-hydrophobic thermal management composite coating, a preparation method thereof, one part of waste clay powder is subjected to carbonization treatment in a tube furnace; one part of waste clay powder is subjected to air-burning oxidation treatment in a tube furnace; two parts of waste clay powder are respectively added into a mixed solution of hexadecane trimethyl siloxane, tetraethyl silicate, ammonia and ethanol for hydrophobic treatment to obtain a dispersion; the dispersion is subjected to centrifugal, washing and drying treatment in sequence to obtain modified waste clay powder after oxidation and carbonization; two surfaces of a substrate are sequentially subjected to washing, drying and plasma treatment; the waste clay powder after oxidation and carbonization is mixed with resin and curing agent respectively, and then added into a solvent for stirring treatment and ultrasonic oscillation treatment to prepare a spray coating; the spray coating is sprayed on two surfaces of the prepared substrate respectively, and a modified waste clay synthetic super-hydrophobic thermal management composite coating is obtained after curing. The composite coating prepared by the method can significantly reduce energy consumption in heating and cooling.

Description

Technical Field

[0001] This invention belongs to the field of superhydrophobic thermal management composite material technology, specifically relating to a modified waste clay-synthesized superhydrophobic thermal management composite coating and its preparation method. Background Technology

[0002] Maintaining a relatively stable temperature plays a crucial role in various industries, such as breeding and brewing. However, traditional temperature regulation mainly relies on air conditioning. While effective, indoor temperature control consumes a significant amount of energy. Statistics show that energy consumption for indoor heating and cooling systems accounts for approximately 20% of the world's total energy demand. Furthermore, these systems emit large amounts of carbon dioxide during operation, causing a very negative impact on the environment. Therefore, developing energy-efficient temperature control methods with minimal carbon footprint is essential. In outdoor environments, heat primarily comes from solar radiation (φ≈0.25–2.5 μm), which is also a major energy source for heating. Insufficient or excessive solar radiation often leads to extreme outdoor conditions. The rational utilization of solar radiation is an ideal strategy for achieving zero-energy outdoor thermal management. In addition, radiating heat into the cold outer space through the atmospheric long-wave infrared (LWIR) transmission window (φ≈8–13 μm) is another key factor. Practice has shown that the heat transfer process can be controlled by adjusting emissivity and transmittance. In recent years, radiation cooling technology using outer space (3K) as a cold source and solar heating technology using the sun (5800K) as a heat source have been proposed, which can effectively achieve passive cooling and heating without additional energy consumption.

[0003] Due to the optical properties of thermal management materials, maintaining a clean surface plays an important role in their performance. However, manual maintenance consumes a lot of human, financial and material resources. Therefore, in recent years, new materials have been prepared by combining superhydrophobic, superlubricating and other self-cleaning functions with thermal management functions to achieve the goal of durable thermal management materials. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a superhydrophobic thermal management composite coating synthesized from modified waste clay and its preparation method. The composite coating prepared by this method can significantly reduce energy consumption in heating and cooling, and greatly reduce the cost of manual maintenance.

[0005] To achieve the above objectives, the present invention provides a method for preparing a superhydrophobic thermal management composite coating synthesized from modified waste clay, comprising the following steps: Step 1: Place the waste bleaching clay in a ball mill for ball milling to obtain waste bleaching clay powder, and then divide the waste bleaching clay powder into two equal portions. Step 2: Carbonize a portion of waste bleaching clay powder in a tubular furnace to obtain carbonized waste bleaching clay powder; Step 3: A portion of waste bleaching clay powder is subjected to air-firing oxidation treatment in a tubular furnace to obtain oxidized waste bleaching clay powder; Step 4: Add the waste bleaching clay powder from Step 2 and Step 3 to a mixed solution of hexadecanetrimethylsiloxane, tetraethyl silicate, ammonia, and ethanol for hydrophobic treatment to obtain a dispersion. Step 5: The dispersion is centrifuged, washed, and dried sequentially to obtain modified oxidized waste clay powder and carbonized waste clay powder, respectively. Step Six: Wash, dry, and plasma treat both sides of the substrate in sequence; Step 7: Mix the oxidized waste clay powder and carbonized waste clay powder with resin and curing agent respectively, then add them to solvent for stirring, and prepare the spray coating by ultrasonic vibration treatment; Step 8: Apply the coating material to both sides of the prepared substrate using a spray gun. After curing, a modified waste clay synthetic superhydrophobic thermal management composite coating is obtained.

[0006] As a preferred option, in the ball milling process in step one, the ball mill speed is 400 r / min and the ball milling time is 6 h.

[0007] As a preferred option, in the carbonization process of step two, the temperature of the tube furnace is 600°C and the carbonization time is 5 hours. At the same time, argon gas is introduced into the tube furnace to form a protective atmosphere during the carbonization process.

[0008] As a preferred option, in the oxidation process in step three, the temperature of the tubular furnace is 500°C and the oxidation time is 5 hours. At the same time, no inert gas is introduced into the tubular furnace during the oxidation process.

[0009] As a preferred embodiment, in the hydrophobic treatment process in step four, the mass fraction of hexadecanetrimethylsiloxane in the mixed solution is 3-5 wt%, the mass fraction of tetraethyl silicate is 3-7 wt%, and the mass fraction of ammonia is 20-26 wt%.

[0010] As a preferred embodiment, in the centrifugation process in step five, the centrifuge speed is 8000 r / min and the centrifugation time is 5 min. At the same time, the centrifugation process and the washing process are repeated multiple times, with the number of cycles being 3 to 5.

[0011] As a preferred embodiment, in the plasma treatment process in step six, the plasma treatment power is 50-150W and the treatment time is 30-35min.

[0012] As a preferred embodiment, in step seven, the resin includes one or more of epoxy resin, polyimide resin, polyamide-imide, or phenolic resin; the curing agent includes one or more of methylhexahydrophthalic anhydride, polyetheramine, or polydiimide; the ratio of resin to curing agent is 1:1; and the solvent is a mixed solution of ethyl acetate and ethanol in a 2:3 ratio.

[0013] As a preferred embodiment, the spray gun pressure is 20 during the spraying operation in step eight. ～ The pressure is 25 MPa, and the vertical distance between the spray gun outlet and the substrate is 18-20 cm; the mass fraction of resin in the superhydrophobic thermal management composite coating is 30%-40%, the curing temperature is 110-130°C, the curing pressure is 0.5-1 MPa, and the curing time is 1-2 h.

[0014] The present invention also provides a modified waste clay synthetic superhydrophobic thermal management composite coating, which is prepared by a method for preparing a modified waste clay synthetic superhydrophobic thermal management composite coating.

[0015] This invention provides a method for synthesizing a superhydrophobic thermal management composite coating using modified waste clay. In the preparation process, the waste clay powder is first subjected to carbonization and oxidation treatments. This significantly improves the uniformity of its distribution in the solvent, thereby significantly enhancing its dispersion performance in spray coatings. Furthermore, the carbonization and oxidation treatments allow the waste clay to achieve extremely high absorbance and reflectance in the solar light band, resulting in waste clay powder with high reflectance and absorbance, laying a solid foundation for the functionalization of waste clay. Hydrophobic treatment further endows the material with self-cleaning properties, and the hydrophobically modified waste clay possesses excellent mechanical properties and a large specific surface area, contributing to a synergistic enhancement effect with the tribological properties of the superhydrophobic thermal management coating. A low-surface-energy polysiloxane (POS) was modified onto the surface of carbonized and oxidized waste clay by hydrolysis and condensation of hexadecanetrimethylsiloxane (HDTMS) and tetraethyl orthosilicate (TEOS). The modified powder and epoxy resin (EP) were then used as the main raw materials, and the two powders were sprayed onto both sides of the substrate to prepare a superhydrophobic thermal management composite coating. This composite coating exhibits excellent superhydrophobic properties, good chemical stability, and self-cleaning properties on both sides. Simultaneously, the white cooling surface provides excellent cooling due to its extremely high reflectivity in the solar band and extremely high emissivity in the infrared band, while the black heating surface provides considerable heating capacity due to its high absorbance in the solar band.

[0016] The composite coating prepared by this method can significantly reduce energy consumption in heating and cooling, and greatly reduce the cost of manual maintenance. Attached Figure Description

[0017] Figure 1 These are scanning electron microscope images of the waste clay before and after carbonization and oxidative modification in this invention. Figure 2 This is a scanning electron microscope image of the hydrophobically modified waste clay after oxidation and carbonization in this invention. Figure 3 This is a scanning electron microscope image of the superhydrophobic thermal management coating in this invention; Figure 4 The measured temperature curves of the superhydrophobic thermal management coating in this invention in different seasons are shown. Figure 5 Images of different liquids on the surface of the superhydrophobic thermal management coating in this invention.

[0018] Figure 6 The contact angle and sliding angle of different liquids on the surface of the superhydrophobic thermal management coating in this invention are shown. Detailed Implementation

[0019] The present invention will be further described below.

[0020] like Figures 1 to 6 As shown, this invention provides a method for preparing a superhydrophobic thermal management composite coating synthesized from modified waste clay, comprising the following steps: Step 1: Place the waste bleaching clay in a ball mill for ball milling to obtain waste bleaching clay powder, and then divide the waste bleaching clay powder into two equal portions. Step 2: Carbonize a portion of waste bleaching clay powder in a tubular furnace to obtain carbonized waste bleaching clay powder; Step 3: A portion of waste bleaching clay powder is subjected to air-firing oxidation treatment in a tubular furnace to obtain oxidized waste bleaching clay powder; Step 4: Add the waste bleaching clay powder from Step 2 and Step 3 to a mixed solution of hexadecanetrimethylsiloxane, tetraethyl silicate, ammonia, and ethanol for hydrophobic treatment to obtain a dispersion. Step 5: The dispersion is centrifuged, washed, and dried sequentially to obtain modified oxidized waste clay powder and carbonized waste clay powder, respectively. Step Six: Wash, dry, and plasma treat both sides of the substrate in sequence; Step 7: Mix the oxidized waste clay powder and carbonized waste clay powder with resin and curing agent respectively, then add them to solvent for stirring, and prepare the spray coating by ultrasonic vibration treatment; Step 8: Apply the coating material to both sides of the prepared substrate using a spray gun. After curing, a modified waste clay synthetic superhydrophobic thermal management composite coating is obtained.

[0021] As a preferred option, in the ball milling process in step one, the ball mill speed is 400 r / min and the ball milling time is 6 h.

[0022] As a preferred option, in the carbonization process of step two, the temperature of the tube furnace is 600°C and the carbonization time is 5 hours. At the same time, argon gas is introduced into the tube furnace to form a protective atmosphere during the carbonization process.

[0023] As a preferred option, in the oxidation process in step three, the temperature of the tubular furnace is 500°C and the oxidation time is 5 hours. At the same time, no inert gas is introduced into the tubular furnace during the oxidation process.

[0024] As a preferred embodiment, in the hydrophobic treatment process in step four, the mass fraction of hexadecanetrimethylsiloxane (HDTMS) in the mixed solution is 3-5 wt%, the mass fraction of tetraethyl silicate (TEOS) is 3-7 wt%, and the mass fraction of ammonia is 20-26 wt%.

[0025] As a preferred embodiment, in the centrifugation process in step five, the centrifuge speed is 8000 r / min and the centrifugation time is 5 min. At the same time, the centrifugation process and the washing process are repeated multiple times, with the number of cycles being 3 to 5.

[0026] As a preferred embodiment, in the plasma treatment process in step six, the plasma treatment power is 50-150W and the treatment time is 30-35min.

[0027] As a preferred embodiment, in step seven, the resin includes one or more of epoxy resin, polyimide resin, polyamide-imide, or phenolic resin; the curing agent includes one or more of methylhexahydrophthalic anhydride, polyetheramine, or polydiimide; the ratio of resin to curing agent is 1:1; and the solvent is a mixed solution of ethyl acetate and ethanol in a 2:3 ratio.

[0028] As a preferred embodiment, the spray gun pressure is 20 during the spraying operation in step eight. ～ The pressure is 25 MPa, and the vertical distance between the spray gun outlet and the substrate is 18-20 cm; the mass fraction of resin in the superhydrophobic thermal management composite coating is 30%-40%, the curing temperature is 110-130°C, the curing pressure is 0.5-1 MPa, and the curing time is 1-2 h.

[0029] The present invention also provides a modified waste clay synthetic superhydrophobic thermal management composite coating, which is prepared by a method for preparing a modified waste clay synthetic superhydrophobic thermal management composite coating. Example

[0030] 1. Place 10g of waste bleaching clay in a ball mill for ball milling. Set the ball mill speed to 400r / min and the ball milling time to 12h. 2. Carbonize 5g of waste bleaching clay powder in a tube furnace. Set the temperature of the tube furnace to 600℃ and the carbonization time to 5h. Introduce argon gas to form a protective atmosphere. 3. Oxidize 5g of waste bleaching clay powder in a tubular furnace. Set the furnace temperature to 500℃ and the carbonization time to 5h. Do not introduce inert gas.

[0031] 4. Add 1g of oxidized and carbonized waste clay to 0.5g hexadecanetrimethylsiloxane, 0.5g tetraethyl silicate, 4g ammonia, and 20ml ethanol respectively; then place the resulting mixed solution in an oil bath, set the temperature to 60℃, the rotation speed to 3000r / min, and the reaction time to 5h. 5. The dispersion after the reaction is completed is centrifuged, washed and dried. The centrifuge speed is set to 8000 r / min and the centrifugation time is 5 min. Ethanol is used for washing. The centrifugation and washing are repeated three times. Then it is dried in an oven at 60℃ to obtain hydrophobically modified oxidized and carbonized waste clay powder. 6. The substrate is washed, dried, and plasma treated. It is washed with an ultrasonic cleaner, dried in an oven, and then plasma treated. The plasma treatment power is 100W and the time is 30min. 7. Mix 1g of modified oxidized and carbonized waste clay with 0.8g of epoxy resin, 0.8g of methylhexahydrophthalic anhydride curing agent, and 10ml of a mixed solution of ethyl acetate and ethanol. After stirring and ultrasonic circulation three times, the coating is obtained. 8. Spray the coating onto both sides of the prepared substrate. The spray gun pressure is 20MPa and the nozzle is 20cm away from the substrate. Then cure to obtain a superhydrophobic thermal management coating. The curing temperature is 120℃, the pressure is 1MPa, and the curing time is 2h. Example

[0032] 1. 10g of waste bleaching clay is ball-milled in a ball mill at a speed of 400r / min for 6 hours. 2. Carbonize 5g of waste bleaching clay powder in a tube furnace. Set the temperature of the tube furnace to 600℃ and the carbonization time to 5h. Introduce argon gas to form a protective atmosphere. 3. Oxidize 5g of waste bleaching clay powder in a tubular furnace. Set the furnace temperature to 500℃ and the carbonization time to 5h. Do not introduce inert gas.

[0033] 4. Add 1g of oxidized and carbonized waste clay to 0.5g of hexadecanetrimethylsiloxane, 1g of tetraethyl silicate, 4g of ammonia, and 20ml of ethanol respectively; then place the resulting mixed solution in an oil bath, set the temperature to 60℃, the rotation speed to 3000r / min, and the reaction time to 5h. 5. The dispersion after the reaction is completed is centrifuged, washed and dried. The centrifuge speed is set to 8000 r / min and the centrifugation time is 5 min. Ethanol is used for washing. The centrifugation and washing are repeated three times. Then it is dried in an oven at 60℃ to obtain hydrophobically modified oxidized and carbonized waste clay powder. 6. The substrate is washed, dried, and plasma treated. It is washed with an ultrasonic cleaner, dried in an oven, and then plasma treated. The plasma treatment power is 50W and the time is 30min. 7. Mix 1g of modified oxidized and carbonized waste clay with 0.8g of epoxy resin, 0.8g of methylhexahydrophthalic anhydride curing agent, and 10ml of a mixed solution of ethyl acetate and ethanol. After stirring and ultrasonic circulation three times, the coating is obtained. 8. Spray the coating onto both sides of the prepared substrate. The spray gun pressure is 20MPa and the nozzle is 20cm away from the substrate. Then cure to obtain a superhydrophobic thermal management coating. The curing temperature is 120℃, the pressure is 1MPa, and the curing time is 2h. Example

[0034] 1. Place 10g of waste bleaching clay in a ball mill and ball mill it. Set the ball mill speed to 400r / min and the ball milling time to 6h. 2. Carbonize 5g of waste bleaching clay powder in a tube furnace. Set the temperature of the tube furnace to 600℃ and the carbonization time to 5h. Introduce argon gas to form a protective atmosphere. 3. Oxidize 5g of waste bleaching clay powder in a tubular furnace. Set the furnace temperature to 500℃ and the carbonization time to 5h. Do not introduce inert gas.

[0035] 4. Add 1g of oxidized and carbonized waste clay to 0.5g hexadecanetrimethylsiloxane, 2g tetraethyl silicate, 4g ammonia, and 20ml ethanol respectively; then place the resulting mixed solution in an oil bath, set the temperature to 60℃, the rotation speed to 3000r / min, and the reaction time to 5h. 5. The dispersion after the reaction is completed is centrifuged, washed and dried. The centrifuge speed is set to 8000 r / min and the centrifugation time is 5 min. Ethanol is used for washing. The centrifugation and washing are repeated three times. Then it is dried in an oven at 60℃ to obtain hydrophobically modified oxidized and carbonized waste clay powder. 6. The substrate is washed, dried, and plasma treated. It is washed with an ultrasonic cleaner, dried in an oven, and then plasma treated. The plasma treatment power is 100W and the time is 35min. 7. Mix 1g of modified oxidized and carbonized waste clay with 0.8g of epoxy resin, 0.8g of methylhexahydrophthalic anhydride curing agent, and 10ml of a mixed solution of ethyl acetate and ethanol. After stirring and ultrasonic circulation three times, the coating is obtained. 8. Spray the coating onto both sides of the prepared substrate. The spray gun pressure is 20MPa and the nozzle is 18cm away from the substrate. Then cure to obtain a superhydrophobic thermal management coating. The curing temperature is 120℃, the pressure is 0.7MPa, and the curing time is 2h. Example

[0036] 1. Place 10g of waste bleaching clay in a ball mill and ball mill it. Set the ball mill speed to 400r / min and the ball milling time to 6h. 2. Carbonize 5g of waste bleaching clay powder in a tube furnace. Set the temperature of the tube furnace to 600℃ and the carbonization time to 5h. Introduce argon gas to form a protective atmosphere. 3. Oxidize 5g of waste bleaching clay powder in a tubular furnace. Set the furnace temperature to 500℃ and the carbonization time to 5h. Do not introduce inert gas.

[0037] 4. Add 1g of oxidized and carbonized waste clay to 0.5g hexadecanetrimethylsiloxane, 0.5g tetraethyl silicate, 4g ammonia, and 20ml ethanol respectively; then place the resulting mixed solution in an oil bath, set the temperature to 60℃, the rotation speed to 3000r / min, and the reaction time to 5h. 5. The dispersion after the reaction is completed is centrifuged, washed and dried. The centrifuge speed is set to 8000 r / min and the centrifugation time is 5 min. Ethanol is used for washing. The centrifugation and washing are repeated three times. Then it is dried in an oven at 60℃ to obtain hydrophobically modified oxidized and carbonized waste clay powder. 6. The substrate is washed, dried, and plasma treated. It is washed with an ultrasonic cleaner, dried in an oven, and then plasma treated. The plasma treatment power is 100W and the time is 30min. 7. Mix 1g of modified oxidized and carbonized waste clay with 0.8g of epoxy resin, 0.8g of polyetheramine curing agent, and 10ml of ethyl acetate and ethanol. Stir and circulate the mixture three times using ultrasound to obtain the coating. 8. Spray the coating onto both sides of the prepared substrate. The spray gun pressure is 20MPa and the nozzle is 20cm away from the substrate. Then cure to obtain a superhydrophobic thermal management coating. The curing temperature is 120℃, the pressure is 1MPa, and the curing time is 2h. Example

[0038] 1. 10g of waste bleaching clay was ball-milled in a ball mill at a speed of 400r / min for 12h. 2. Carbonize 5g of waste bleaching clay powder in a tube furnace. Set the temperature of the tube furnace to 600℃ and the carbonization time to 5h. Introduce argon gas to form a protective atmosphere. 3. Oxidize 5g of waste bleaching clay powder in a tubular furnace. Set the furnace temperature to 500℃ and the carbonization time to 5h. Do not introduce inert gas.

[0039] 4. Add 1g of oxidized and carbonized waste clay to 0.5g hexadecanetrimethylsiloxane, 0.5g tetraethyl silicate, 4g ammonia, and 20ml ethanol respectively; then place the resulting mixed solution in an oil bath, set the temperature to 60℃, the rotation speed to 3000r / min, and the reaction time to 5h. 5. The dispersion after the reaction is completed is centrifuged, washed and dried. The centrifuge speed is set to 8000 r / min and the centrifugation time is 5 min. Ethanol is used for washing. The centrifugation and washing are repeated three times. Then it is dried in an oven at 60℃ to obtain hydrophobically modified oxidized and carbonized waste clay powder. 6. The substrate is washed, dried, and plasma treated. It is washed with an ultrasonic cleaner, dried in an oven, and then plasma treated. The plasma treatment power is 100W and the time is 30min. 7. Mix 1g of modified oxidized and carbonized waste clay with 0.8g of phenolic resin, 0.8g of polyetheramine curing agent, and 10ml of a mixed solution of ethyl acetate and ethanol. After stirring and ultrasonic circulation three times, the coating is obtained. 8. Spray the coating onto both sides of the prepared substrate. The spray gun pressure is 20MPa and the nozzle is 20cm away from the substrate. Then cure to obtain a superhydrophobic thermal management coating. The curing temperature is 120℃, the pressure is 1MPa, and the curing time is 2h.

[0040] This invention provides a method for synthesizing a superhydrophobic thermal management composite coating using modified waste clay. In the preparation process, the waste clay powder is first subjected to carbonization and oxidation treatments. This significantly improves the uniformity of its distribution in the solvent, thereby significantly enhancing its dispersion performance in spray coatings. Furthermore, the carbonization and oxidation treatments allow the waste clay to achieve extremely high absorbance and reflectance in the solar light band, resulting in waste clay powder with high reflectance and absorbance, laying a solid foundation for the functionalization of waste clay. Hydrophobic treatment further endows the material with self-cleaning properties, and the hydrophobically modified waste clay possesses excellent mechanical properties and a large specific surface area, contributing to a synergistic enhancement effect with the tribological properties of the superhydrophobic thermal management coating. A low-surface-energy polysiloxane (POS) was modified onto the surface of carbonized and oxidized waste clay by hydrolysis and condensation of hexadecanetrimethylsiloxane (HDTMS) and tetraethyl orthosilicate (TEOS). The modified powder and epoxy resin (EP) were then used as the main raw materials, and the two powders were sprayed onto both sides of the substrate to prepare a superhydrophobic thermal management composite coating. This composite coating exhibits excellent superhydrophobic properties, good chemical stability, and self-cleaning properties on both sides. Simultaneously, the white cooling surface provides excellent cooling due to its extremely high reflectivity in the solar band and extremely high emissivity in the infrared band, while the black heating surface provides considerable heating capacity due to its high absorbance in the solar band.

[0041] The composite coating prepared by this method can significantly reduce energy consumption in heating and cooling, and greatly reduce the cost of manual maintenance.

Claims

1. A method for preparing a superhydrophobic thermal management composite coating synthesized from modified waste clay, characterized in that, Includes the following steps: Step 1: Place the waste bleaching clay in a ball mill for ball milling to obtain waste bleaching clay powder, and then divide the waste bleaching clay powder into two equal portions. Step 2: Carbonize a portion of waste bleaching clay powder in a tubular furnace to obtain carbonized waste bleaching clay powder; Step 3: A portion of waste bleaching clay powder is subjected to air-firing oxidation treatment in a tubular furnace to obtain oxidized waste bleaching clay powder; Step 4: Add the waste bleaching clay powder from Step 2 and Step 3 to a mixed solution of hexadecyltrimethoxysilane, tetraethyl silicate, ammonia, and ethanol for hydrophobic treatment, and obtain a dispersion. Step 5: The dispersion is centrifuged, washed, and dried sequentially to obtain modified oxidized waste clay powder and carbonized waste clay powder, respectively. Step Six: Wash, dry, and plasma treat both sides of the substrate in sequence; Step 7: Mix the oxidized waste clay powder and carbonized waste clay powder with resin and curing agent respectively, then add them to solvent for stirring, and prepare the spray coating by ultrasonic vibration treatment; Step 8: Apply the coating material to both sides of the prepared substrate using a spray gun. After curing, a modified waste clay synthetic superhydrophobic thermal management composite coating is obtained.

2. The method for preparing a superhydrophobic thermal management composite coating synthesized from modified waste clay according to claim 1, characterized in that, In the ball milling process in step one, the ball mill speed is 400 r / min and the ball milling time is 6 h.

3. The method for preparing a superhydrophobic thermal management composite coating synthesized from modified waste clay according to claim 1, characterized in that, In the carbonization process in step two, the temperature of the tube furnace is 600℃ and the carbonization time is 5 hours. At the same time, argon gas is introduced into the tube furnace to form a protective atmosphere during the carbonization process.

4. The method for preparing a superhydrophobic thermal management composite coating synthesized from modified waste clay according to claim 1, characterized in that, In the oxidation process in step three, the temperature of the tube furnace is 500℃ and the oxidation time is 5 hours. At the same time, no inert gas is introduced into the tube furnace during the oxidation process.

5. The method for preparing a superhydrophobic thermal management composite coating synthesized from modified waste clay according to claim 1, characterized in that, In the hydrophobic treatment process in step four, the mass fraction of hexadecyltrimethoxysilane in the mixed solution is 3-5 wt%, the mass fraction of tetraethyl silicate is 3-7 wt%, and the mass fraction of ammonia is 20-26 wt%.

6. The method for preparing a superhydrophobic thermal management composite coating synthesized from modified waste clay according to claim 1, characterized in that, In the centrifugation process in step five, the centrifuge speed is 8000 r / min and the centrifugation time is 5 min. At the same time, the centrifugation process and the washing process are repeated multiple times, with the number of cycles being 3 to 5.

7. The method for preparing a superhydrophobic thermal management composite coating synthesized from modified waste clay according to claim 1, characterized in that, In the plasma treatment process in step six, the plasma treatment power is 50-150W and the treatment time is 30-35min.

8. The method for preparing a superhydrophobic thermal management composite coating synthesized from modified waste clay according to claim 1, characterized in that, In step seven, the resin includes one or more of epoxy resin, polyimide, polyamide-imide, or phenolic resin; the curing agent includes one or two of methylhexahydrophthalic anhydride and polyetheramine; the mass ratio of the resin to the curing agent is 1:1; and the solvent is a mixed solution of ethyl acetate and ethanol in a 2:3 ratio.

9. The method for preparing a superhydrophobic thermal management composite coating synthesized from modified waste clay according to claim 1, characterized in that, During the spraying operation in step eight, the spray gun pressure is 20. ～ The pressure is 25 MPa, and the vertical distance between the spray gun outlet and the substrate is 18-20 cm; the mass fraction of resin in the superhydrophobic thermal management composite coating is 30%-40%, the curing temperature is 110-130°C, the curing pressure is 0.5-1 MPa, and the curing time is 1-2 h.

10. A modified waste clay-synthesized superhydrophobic thermal management composite coating, characterized in that, The superhydrophobic thermal management composite coating was prepared using the method described in any one of claims 1 to 9.

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