Hybrid nanofluid, coating, liquid thermal insulation storage and transportation equipment and preparation method thereof

Abstract

The present invention discloses a hybrid nanofluid, a coating, a liquid heat-insulating storage and transportation equipment and a preparation method thereof, which belongs to the field of nanomaterials and coating technology, and solves the problems of insufficient heat dissipation measures and low thermal management efficiency of liquid heat-insulating storage and transportation equipment in the prior art. The preparation method of the hybrid nanofluid comprises the steps of: functionalizing multi-walled carbon nanotubes with sodium N-methyl-N-octadecyl taurate to obtain functionalized multi-walled carbon nanotubes; adding bisaminopropyl polyether to an aqueous suspension of alumina, stirring, centrifuging, and drying in sequence to obtain stable alumina particles; adding the functionalized multi-walled carbon nanotubes, the stable alumina particles, and titanium carbide to a base liquid, dispersing them evenly, and obtaining a hybrid nanofluid. The hybrid nanofluid provided by the present invention is applied to the heat preservation of liquid storage and transportation equipment, and has excellent thermal conductivity, weather resistance, long-term stability, and corrosion resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of nanomaterials and coatings, and more specifically to a hybrid nanofluid, coating, liquid heat-insulating storage and transportation equipment, and a preparation method thereof. Background Art

[0002] Liquid hydrogen is a clean and efficient energy carrier. However, its extremely low storage temperature (-253°C) places stringent demands on temperature control during transportation and storage. To address this issue, various technologies have been employed, including vacuum multi-layer insulation design and traditional thermal insulation coatings.

[0003] Vacuum multi-layer insulation design uses materials such as aluminum alloy coatings and epoxy resin coatings as the exterior coating. This method effectively isolates external heat, but it also suffers from issues such as the vulnerability of the vacuum layer to damage and the coating surface to oxidation, which can lead to increased liquid hydrogen evaporation losses, a sharp decline in thermal insulation performance, and potential safety risks. Traditional insulation coatings, such as aluminum alloy coatings and epoxy resin coatings, suffer from poor adhesion, insufficient high-temperature resistance, and poor long-term stability in practical applications. Summary of the Invention

[0004] The present invention provides a hybrid nanofluid, a coating, a liquid thermal insulation storage and transportation device and a preparation method thereof, which are used to solve the problems of insufficient heat dissipation measures and low thermal management efficiency of liquid thermal insulation storage and transportation equipment in the prior art.

[0005] In a first aspect, the present invention provides a method for preparing a hybrid nanofluid, comprising the following steps: functionalizing multi-walled carbon nanotubes (MWCNTs) with sodium N-methyl-N-octadecyl taurate (SMDS) to obtain functionalized multi-walled carbon nanotubes (whose microstructure is as follows: Figure 1 ); adding bisaminopropyl polyether to the aqueous suspension of aluminum oxide (Al2O3), stirring, centrifuging and drying in sequence to obtain stable aluminum oxide particles; the functionalized multi-walled carbon nanotubes, the stable aluminum oxide particles and titanium carbide (Ti3C2T x ) is added into the base liquid and dispersed evenly to obtain the hybrid nanofluid.

[0006] The raw materials for preparing the hybrid nanofluid provided by the present invention include MWCNTs having excellent axial thermal conductivity, Al2O3 having excellent chemical stability, and Ti3C2T x The invention uses SMDS to perform functionalization treatment on MWCNTs to enhance their compatibility with liquid matrix.

[0007] The latent heat properties of the hybrid nanofluid were analyzed by thermal property research. Differential scanning calorimetry (DSC, used to determine the thermal stability of the material) and thermogravimetric analysis (TGA, used to evaluate the mass loss of the coating at high temperature) were used to evaluate the thermal properties of the prepared hybrid nanofluid. The results showed that the prepared hybrid nanofluid can maintain stable thermal conductivity at high temperatures. The hybrid nanofluid was characterized by Fourier transform infrared spectroscopy (FTIR) technology to analyze its surface chemical structure and functional treatment effect. The Ti3C2T x The synergistic effect between MWCNTs and Al2O3 improves the chemical stability and thermal conductivity of the material.

[0008] As a possible implementation, the base liquid is one or a combination of water and ethanol; and / or the mass ratio of the functionalized multi-walled carbon nanotubes, the stable alumina particles, and titanium carbide is 1:1 to 2:2 to 3; and / or the uniform dispersion is achieved by ultrasonic treatment. As a possible implementation, the functionalization treatment includes the steps of: mixing the multi-walled carbon nanotubes with a 0.1 mol / L solution of sodium N-methyl-N-octadecyl taurate, sequentially performing ultrasonic dispersion, stirring at room temperature, filtering, washing, and drying to constant weight to obtain the functionalized multi-walled carbon nanotubes; and / or the preparation process of the stable alumina particles includes the steps of: adding bisaminopropyl polyether to a suspension of alumina particles and deionized water at a mass ratio of 1:5, stirring at 300 rpm at 60°C for 1 hour, centrifuging, and drying to obtain the stable alumina particles.

[0009] In a second aspect, the present invention provides a hybrid nanofluid prepared by the preparation method described in any possible implementation of the first aspect.

[0010] In a third aspect, the present invention provides a hybrid nanofluid coating, the preparation process of which includes the steps of: mixing the hybrid nanofluid described in claim 4, epoxy resin and bisaminopropyl polyether, adding a dispersant, dispersing them evenly, and evaporating the solvent at 50-70°C to form a coating component A; adding a curing agent, propylene glycol methyl ether, acrylic acid and polysiloxane to an organic solvent, ultrasonically dispersing them evenly to form a coating component B; and mixing the coating component A and the coating component B evenly to obtain the hybrid nanofluid coating.

[0011] As a possible implementation manner, the dispersant is a nanosilane coating material; and / or the curing agent is isocyanate; and / or the organic solvent is ethanol; and / or the mass ratio of the hybrid nanofluid, the epoxy resin, the bisaminopropyl polyether and the dispersant is 28:70:0.5:1.5; and / or the mass ratio of the curing agent, the propylene glycol methyl ether, the acrylic acid and the polysiloxane is 20:3:0.7:0.5; and / or the mass ratio of the coating component A and the coating component B is 7:3.

[0012] In a fourth aspect, the present invention provides an application of a hybrid nanofluid prepared by the preparation method described in any possible implementation of the first aspect, or a hybrid nanofluid described in any possible implementation of the second aspect, or a hybrid nanofluid coating described in any possible implementation of the third aspect in liquid insulation storage and transportation equipment.

[0013] In a fifth aspect, the present invention provides a liquid thermal insulation storage and transportation device, the outer surface of which is coated with the hybrid nanofluid coating described in the fourth aspect; the outer surface of the hybrid nanofluid coating is coated with a topcoat.

[0014] As a possible implementation, the coating step of the hybrid nanofluid coating includes: spraying at a pressure of 0.3 MPa and a thickness of 50 to 150 μm, and then drying at a temperature of 60° C. until the hybrid nanofluid coating is fully cured.

[0015] As a possible implementation method, the preparation steps of the topcoat include: mixing a polyurethane resin with modified polyvinyl alcohol, adding a thickener and a solvent, and stirring at 60° C. for 1 hour to obtain the topcoat.

[0016] As a possible implementation, the liquid insulation storage and transportation equipment includes but is not limited to liquid hydrogen / liquid nitrogen / liquid oxygen transport vehicles, liquid hydrogen / liquid nitrogen / liquid oxygen storage tanks, and liquid hydrogen / liquid nitrogen / liquid oxygen storage tanks.

[0017] In the preparation of the hybrid nanofluid provided by the present invention, the three raw materials show a synergistic effect in the composite, significantly improving the thermal conductivity, mechanical strength and chemical stability of the target product; the materials used are recyclable, non-toxic and environmentally friendly, in line with the concept of green development, especially in high-temperature environments, they will not release harmful substances.

[0018] The hybrid nanofluid coating provided by this invention, due to the extremely small size of its nanoparticles, possesses high internal thermal conductivity, enabling rapid transfer and dissipation of external heat. By modifying the nanofluid surface to enhance the nanocoating's stability, thermal conductivity, and weatherability, the hybrid nanofluid coating exhibits excellent high-temperature resistance, weather resistance, and long-term stability. This allows it to maintain excellent performance even under the extremely low temperatures (-253°C) and complex conditions encountered during liquid storage and transportation, ensuring efficient temperature control and safe operation. Furthermore, the hybrid nanofluid coating exhibits low energy consumption, sustainability, and long-term reliability during preparation and application, meeting the requirements for efficient and environmentally friendly liquid storage and transportation, and possesses broad application prospects.

[0019] The liquid thermal insulation storage and transportation equipment prepared with the hybrid nanofluid coating provided by the present invention has excellent thermal conductivity, dispersibility and weather resistance, which significantly improves its performance under extreme environmental conditions (extremely high temperature, extremely low temperature, etc.). The liquid thermal insulation storage and transportation equipment can operate stably for a long time in complex climate environments such as high temperature, humidity and ultraviolet radiation, and exhibits excellent anti-aging ability and thermal management performance. It can effectively block external heat transfer and effectively prevent evaporation loss of liquid inside the liquid thermal insulation storage and transportation equipment due to ambient temperature fluctuations, thereby ensuring internal low-temperature stability and improving storage and transportation safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 Schematic diagram of the microstructure of functionalized multi-walled carbon nanotubes provided by an embodiment of the present invention.

[0022] Figure 2 Flow chart for preparing hybrid nanofluid coating provided in an embodiment of the present invention.

[0023] Figure 3 This is a scanning electron microscope (SEM) image of the hybrid nanofluid provided by an embodiment of the present invention.

[0024] Figure 4 The embodiment of the present invention provides the influence of temperature on the thermal conductivity of different nanomaterials. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0026] In order to solve the problems of insufficient heat dissipation measures and low thermal management efficiency of liquid thermal insulation storage and transportation equipment in the prior art, the embodiments of the present invention provide a hybrid nanofluid, a coating, a liquid thermal insulation storage and transportation equipment and a preparation method thereof.

[0027] The present application provides a hybrid nanofluid preparation experiment and performs SEM characterization using the prepared hybrid nanofluid I as an example. It is shown that hybrid nanofluid I has a denser structure, which facilitates rapid heat dissipation. A comparative characterization of various physical and chemical properties of the prepared hybrid nanofluids reveals that the hybrid nanofluid provided by the present invention has an approximately 36% increase in thermal conductivity, a thinner coating thickness, which facilitates improved thermal conductivity, an approximately 30% reduction in curing time, and higher efficiency. All raw materials are environmentally friendly and recyclable, in line with green energy concepts, and the service life is increased by approximately 50%.

[0028] Furthermore, the embodiment of the present invention provides a preparation experiment of a hybrid nanofluid coating and verifies the effect. It can be seen that the hybrid nanofluid coating provided by the present invention has excellent thermal conductivity stability and outstanding thermal insulation performance, ensuring that the liquid hydrogen storage tank is not significantly affected by changes in external ambient temperature. Whether in an extremely high temperature, low temperature, humid heat or strong ultraviolet radiation environment, the coating can maintain its thermal management effect without obvious performance degradation. In addition, the hybrid nanofluid coating provided by the present invention has significant hydrophilicity, which helps to reduce water droplet accumulation and improve heat dissipation performance. Its thermal conductivity is more than 30% higher than that of traditional coatings, which significantly improves thermal conductivity, can effectively alleviate the problem of liquid hydrogen evaporation caused by temperature increase, and can effectively block external heat (such as solar radiation, ambient temperature fluctuations, etc.) from being conducted to the inside of the liquid hydrogen storage tank, maintaining the ultra-low temperature (-253°C) stability of the liquid hydrogen storage tank. It has excellent anti-corrosion properties and can provide reliable anti-corrosion protection under normal conditions. It can also maintain long-term stability and reliability in extreme environments such as low temperature, humidity and heat, and highly corrosive liquids, thereby significantly extending the service life of liquid hydrogen transport vehicles and greatly improving the safety and economy of the transportation process.

[0029] The technical solution of the present invention will be further described below with reference to specific embodiments.

[0030] Example 1

[0031] This embodiment provides a preparation experiment of a hybrid nanofluid.

[0032] according to Figure 2 In the first three steps of the process shown, MWCNTs were treated with a 0.1 mol / L SMDS solution, ultrasonically dispersed for 30 minutes, stirred at room temperature for 2 hours, filtered, washed with deionized water until neutral, and dried to constant weight to obtain functionalized MWCNTs; a suspension of alumina particles and deionized water (mass ratio 1:5) was stirred at 300 rpm at 60°C for 1 hour, centrifuged, and dried to obtain stable alumina particles.

[0033] 5g functionalized MWCNTs, 5g Ti3C2T x and 10g of stable alumina particles were mixed in 1000mL of base liquid I (ethylene glycol), and treated with ultrasonic dispersion (frequency 40kHz, power 300W) at 70℃ for 1 hour to obtain hybrid nanofluid I. The prepared hybrid nanofluid I was scanned by SEM, and the following results were obtained: Figure 3 From the results shown, it can be seen that the structure of hybrid nanofluid I is more compact, which is conducive to the rapid dissipation of heat.

[0034] 5g functionalized MWCNTs, 10g Ti3C2T x The mixture was mixed with 15 g of stable alumina particles in base liquid II (deionized water: ethylene glycol volume ratio = 1:1), and treated with ultrasonic dispersion (frequency 40 kHz, power 600 W) at 70 ° C for 6 hours to obtain hybrid nanofluid II.

[0035] 5 g of functionalized MWCNTs and 10 g of stabilized alumina particles were mixed in 1000 mL of base liquid I (ethylene glycol) and treated with ultrasonic dispersion (frequency 40 kHz, power 300 W) at 70°C for 1 hour to obtain hybrid nanofluid III.

[0036] The thermal conductivity of the prepared hybrid nanofluids I and III was measured, and the results were as follows: Figure 4 From the results shown, it can be seen that the thermal conductivity of hybrid nanofluid I changes faster with temperature, so its thermal conductivity is higher, which is conducive to adapting to external temperature changes and improving temperature stability.

[0037] The performance of the prepared hybrid nanofluids I and III was tested, and the results shown in Table 1 were obtained.

[0038] Table 1 Characterization results of hybrid nanofluid performance

[0039] Performance indicators Hybrid Nanofluids I Hybrid Nanofluids III Particle size (nm) 10～50 60～80 Thermal conductivity (W / m·K) 75 55 Coating thickness (μm) 50～120 60～150 Curing time (h) 3～5 6～8 Operating temperature (℃) -253～100 -200～70 Raw material properties Environmentally friendly and recyclable Some are not recyclable Service life (y) ≥15 ≥10 Reunion No agglomeration, no sedimentation No agglomeration, no sedimentation

[0040] Depend on Figure 1It can be seen that compared with hybrid nanofluid III, the thermal conductivity of hybrid nanofluid I is increased by about 36%, the coating thickness is thinner, which is conducive to improving thermal conductivity efficiency, the curing time is shortened by about 30%, and the efficiency is higher. The raw materials are all environmentally friendly and recyclable raw materials, which are in line with the concept of green energy, and the service life is increased by about 50%. x It plays an important role in improving the performance of hybrid nanofluids.

[0041] Example 2

[0042] This embodiment provides an experiment for preparing a hybrid nanofluid coating.

[0043] according to Figure 2 In the second two steps of the process shown, the hybrid nanofluid coating I (3% concentration) prepared in Example 1, epoxy resin (70% by mass), and Jeffamine (0.5% by mass) were mixed, and a nanosilane coating material (1.5% by mass) was added as a dispersant. Ultrasonic dispersion was performed for 2 hours. The temperature was raised to 60°C, and the ethanol solvent was evaporated with stirring to form a modified coating primer component A. Isocyanate (20% by mass) as a curing agent, propylene glycol methyl ether (3% by mass), acrylic acid (0.7% by mass), and polysiloxane (0.5% by mass) were mixed, and solvent was added and ultrasonic dispersion was performed to form coating component B. The modified coating primer component A and coating component B were mixed in a mass ratio of 7:3 and stirred to obtain hybrid nanofluid coating I.

[0044] Hybrid nanofluid II (1.5% concentration) prepared in Example 1, epoxy resin (75% by mass), and Jeffamine (0.5% by mass) were mixed, and a nanosilane coating material (1.5% by mass) was added as a dispersant. Ultrasonic dispersion was performed for 2 hours. The temperature was raised to 60°C, and the solvent was evaporated with stirring to form a modified coating primer component A. Isocyanate (20% by mass) was mixed as a curing agent, propylene glycol methyl ether (3% by mass), acrylic acid (0.7% by mass), and polysiloxane (0.5% by mass) were added, and the solvent was added and ultrasonic dispersion was performed to form a coating component B. The modified coating primer component A and coating component B were mixed in a mass ratio of 7:3 and stirred to obtain a hybrid nanofluid coating II.

[0045] Example 3

[0046] This embodiment provides an application effect verification experiment of a hybrid nanofluid coating.

[0047] The application scenarios of the liquid insulation storage and transportation equipment mentioned in this embodiment include but are not limited to liquid hydrogen / liquid nitrogen / liquid oxygen transport vehicles, liquid hydrogen / liquid nitrogen / liquid oxygen storage tanks, and liquid hydrogen / liquid nitrogen / liquid oxygen storage tanks. In this embodiment, various tests were carried out using liquid hydrogen storage tanks as an example. The topcoat preparation process used in this embodiment comprises: mixing a polyurethane resin (mass fraction 55%) and a modified polyvinyl alcohol (mass fraction 20%) in a mass ratio of 1:0.2, adding a thickener (mass fraction 15%) and a solvent (mass fraction 10%), stirring at 60°C for 1 hour, and preparing a topcoat. The topcoat has excellent smoothness and hydrophilic properties, which can enhance the weather resistance and long-term stability of the coating.

[0048] Hybrid nanofluid coating I from Example 2 was evenly sprayed onto the outer surface of the liquid hydrogen storage tank at a spray pressure of 0.3 MPa, a spray distance of 10 cm, and a coating thickness of 50 μm. After coating, the coating was dried in a drying oven at 60°C for 6 hours until fully cured. A topcoat was then applied and dried to cure, yielding fluid test model I.

[0049] The hybrid nanofluid coating II from Example 2 was evenly sprayed onto the outer surface of the liquid hydrogen storage tank at a pressure of 0.3 MPa, a spraying distance of 10 cm, and a coating thickness of 100 μm. After coating, the coating was dried in a drying oven at 60°C for 12 hours until fully cured. A topcoat was then applied and dried to obtain Fluid Test Model II.

[0050] The topcoat is applied to the outer surface of the liquid hydrogen storage tank, dried and solidified, and a fluid test model III is obtained.

[0051] A commercial coating (polyurethane coating) was evenly sprayed onto the exterior of the liquid hydrogen storage tank at a pressure of 0.3 MPa, a spray distance of 10 cm, and a coating thickness of 100 μm. After coating, the coating was dried in a drying oven at 60°C for 12 hours until fully cured. A topcoat was then applied and dried to obtain Fluid Test Model IV.

[0052] A 10% aluminum oxide solution was evenly sprayed onto the outer surface of the liquid hydrogen storage tank at a pressure of 0.3 MPa, a spray distance of 10 cm, and a coating thickness of 100 μm. After coating, the coating was dried in a drying oven at 60°C for 12 hours until fully cured. A topcoat was then applied and dried to obtain Fluid Test Model V.

[0053] The fluid test model I and fluid test model II were placed in a temperature range of -196°C to 150°C to test the thermal conduction stability. The results showed that the surface temperature fluctuations of fluid test model I and fluid test model II were both within 5°C. It can be seen that hybrid nanofluid coating I and hybrid nanofluid coating II both have excellent thermal conduction stability and outstanding thermal insulation performance, ensuring that the liquid hydrogen storage tank is not significantly affected by changes in external ambient temperature. Whether in extremely high temperature, low temperature, humid heat or strong ultraviolet radiation environment, the coating can maintain its thermal management effect without obvious performance degradation.

[0054] The physical and chemical properties of fluid test models I to V were characterized, and the results shown in Table 2 were obtained.

[0055] Table 2 Fluid test model performance characterization results

[0056]

[0057] Table 2 shows that, compared to Fluid Test Model III, Hybrid Nanofluid Coating I and Hybrid Nanofluid Coating II exhibit significant hydrophilicity, helping to reduce water droplet accumulation and improve heat dissipation. Compared to existing, mature coatings (Fluid Test Model IV and Fluid Test Model V), Hybrid Nanofluid Coating I and Hybrid Nanofluid Coating II both exhibit over 30% higher thermal conductivity, significantly improving thermal conductivity. This significantly mitigates the issue of liquid hydrogen evaporation caused by elevated temperatures. They effectively block external heat (such as solar radiation and ambient temperature fluctuations) from conducting into the liquid hydrogen storage tank, maintaining the tank's ultra-low temperature stability (-253°C), thereby effectively preventing safety hazards such as increased pressure, liquid hydrogen evaporation, and leakage caused by elevated temperatures. Furthermore, the coatings exhibit excellent weather resistance and long-term stability in extreme low-temperature environments, significantly enhancing the safety and reliability of liquid hydrogen transportation. They effectively reduce the temperature rise of liquid hydrogen transport vehicles and minimize evaporation losses, significantly improving transportation safety and economic efficiency. Furthermore, Hybrid Nanofluid Coating I and Hybrid Nanofluid Coating II exhibit excellent corrosion resistance. Traditional alumina coatings have significantly reduced thermal management capabilities and hydrophilicity in extreme environments, and their stability is poor; however, hybrid nanofluid coating I and hybrid nanofluid coating II can provide reliable corrosion protection under normal conditions, and can also maintain long-term stability and reliability in extreme environments such as low temperature, humidity and heat, and highly corrosive liquids, thereby significantly extending the service life of liquid hydrogen transport vehicles, while greatly improving the safety and economy of the transportation process.

[0058] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0059] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A method for preparing a hybrid nanofluid, characterized in that: The following steps are involved: functionalizing multi-walled carbon nanotubes with sodium N-methyl-N-octadecyl taurate to obtain functionalized multi-walled carbon nanotubes; Adding bisaminopropyl polyether to an aqueous suspension of aluminum oxide, stirring, centrifuging, and drying are performed in sequence to obtain stable aluminum oxide particles; The functionalized multi-walled carbon nanotubes, the stable aluminum oxide particles and titanium carbide are added into a base liquid and dispersed uniformly to obtain the hybrid nanofluid.

2. The preparation method according to claim 1, characterized in that The base liquid is one of water and ethanol or a combination of the two; and / or, the mass ratio of the functionalized multi-walled carbon nanotubes, the stable alumina particles, and titanium carbide is 1:1-2:2-3; And / or, the uniform dispersion is achieved by ultrasonic treatment.

3. The preparation method according to claim 1, characterized in that The functionalization treatment comprises the steps of: mixing the multi-walled carbon nanotubes with a 0.1 mol / L solution of sodium N-methyl-N-octadecyl taurate, sequentially performing ultrasonic dispersion, stirring at room temperature, filtering, washing, and drying to a constant weight to obtain the functionalized multi-walled carbon nanotubes; And / or, the preparation process of the stable alumina particles includes the steps of: adding bisaminopropyl polyether to a suspension of alumina particles and deionized water in a mass ratio of 1:5, stirring at 300 rpm at 60°C for 1 hour, centrifuging, and drying to obtain the stable alumina particles.

4. A hybrid nanofluid, characterized in that: The method is prepared according to any one of claims 1 to 3.

5. A hybrid nanofluid coating, characterized in that: The preparation process includes the following steps: The hybrid nanofluid according to claim 4, epoxy resin and bisaminopropyl polyether are mixed, a dispersant is added, the mixture is evenly dispersed, and the solvent is evaporated at 50-70° C. to form a coating component A; Adding a curing agent, propylene glycol methyl ether, acrylic acid and polysiloxane into an organic solvent and uniformly dispersing them by ultrasonication to form a coating component B; The coating component A and the coating component B are mixed evenly to obtain the hybrid nanofluid coating.

6. The hybrid nanofluid coating according to claim 5, characterized in that The dispersant is a nano-silane coating material; and / or, the curing agent is isocyanate; And / or, the organic solvent is ethanol; and / or, the mass ratio of the hybrid nanofluid, the epoxy resin, the bisaminopropyl polyether, and the dispersant is 28:70:0.5:1.5; And / or, the mass ratio of the curing agent, the propylene glycol methyl ether, the acrylic acid and the polysiloxane is 20:3:0.7:0.5; And / or, the mass ratio of the coating component A to the coating component B is 7:

3.

7. Use of the hybrid nanofluid prepared by the preparation method according to any one of claims 1 to 3, the hybrid nanofluid according to claim 4, or the hybrid nanofluid coating according to any one of claims 5 to 6 in liquid thermal insulation storage and transportation equipment.

8. A liquid heat preservation storage and transportation equipment, characterized in that: Its outer surface is coated with the hybrid nanofluid coating according to any one of claims 5 to 6; and the outer surface of the hybrid nanofluid coating is coated with a topcoat.

9. The liquid heat preservation storage and transportation equipment according to claim 8, characterized in that: The coating step of the hybrid nanofluid coating includes: spraying at a pressure of 0.3 MPa and a thickness of 50-150 μm, and then drying at a temperature of 60° C. until the hybrid nanofluid coating is fully cured.

10. The liquid heat preservation storage and transportation equipment according to claim 8, characterized in that: The preparation steps of the topcoat include: mixing polyurethane resin and modified polyvinyl alcohol, adding a thickener and a solvent, and stirring at 60° C. for 1 hour to obtain the topcoat.

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