Hybrid aerogel, hybrid aerogel coating and aerogel super-hydrophobic flame-retardant thermal insulation board

Abstract

The application provides a hybrid aerogel, a hybrid aerogel coating and an aerogel super-hydrophobic flame-retardant thermal insulation board, wherein a silanol and a layered silicate dispersion liquid are sequentially added to a polyimide nanofiber suspension liquid to obtain a precursor suspension liquid, the precursor suspension liquid is freeze-dried to obtain an aerogel, and the aerogel is subjected to heat treatment to obtain a hybrid aerogel; the hybrid aerogel is prepared into a hybrid aerogel coating; and the hybrid aerogel coating is coated on a board surface to obtain an aerogel super-hydrophobic flame-retardant thermal insulation board. In the application, the aerogel is generated in situ between layers of the layered silicate to form a sandwich structure, and the dispersibility of the aerogel particles is improved. The polyimide nanofiber is a high-strength nanofiber with excellent high-temperature resistance and flame retardation, and plays a role of a reinforcing bar to anchor the aerogel particles in the layered silicate. The obtained aerogel particles have super-hydrophobic effect, and can improve the waterproof performance of the application product. The addition of the aerogel can significantly improve the thermal insulation performance of the thermal insulation board.

Description

Technical Field

[0001] This application belongs to the field of polymer materials, specifically relating to a hybrid aerogel, a hybrid aerogel coating, and an aerogel superhydrophobic flame-retardant insulation board thereof. Background Technology

[0002] The global energy crisis has made energy conservation a key focus across various industries. In the construction industry, buildings account for a significant portion of energy consumption, a large part of which is due to heat transfer. Therefore, high-efficiency insulation materials have become essential for reducing energy consumption.

[0003] Traditional insulation materials offer some insulation performance, but over time and due to environmental factors, heat is still lost through conduction, convection, and radiation. Rock wool insulation boards, for example, have a fibrous structure that creates pores that easily absorb moisture. Once water is absorbed, not only does it increase the weight of the insulation board, but it also significantly increases its thermal conductivity. Because water has a much higher thermal conductivity than air, when the pores are filled with water, heat is more easily transferred through the insulation board, greatly reducing its insulation effectiveness. Aluminum silicate insulation materials have similar problems; they are prone to moisture absorption in humid environments, leading to a decline in insulation performance. Furthermore, damp insulation materials can breed mold and other harmful substances, affecting the air quality inside buildings and the health of residents.

[0004] Meanwhile, due to the urgent needs of the industrial sector, superhydrophobic flame-retardant insulation panels have a wide range of applications. In the aerospace field, aircraft need to operate in extreme temperature environments. At high altitudes, the external temperature of an aircraft is extremely low, while the internal instruments and equipment generate heat, requiring highly efficient insulation materials to maintain temperature balance. Furthermore, when traversing humid environments such as cloud cover, the insulation material will not fail due to water absorption. High-temperature kilns, during operation, have internal temperatures reaching thousands of degrees Celsius, requiring excellent insulation materials to reduce heat loss and improve energy efficiency. Moreover, the environment around kilns can be complex, including moisture and dust; ordinary insulation materials are easily damaged after absorbing water, while superhydrophobic insulation panels can effectively address this situation. In the petrochemical industry, many pipelines and equipment require insulation to ensure the temperature stability of the internal media and prevent heat loss or external heat interference. The environment in which these devices operate may contain various chemicals and moisture; superhydrophobic insulation panels can prevent moisture erosion of the insulation layer, ensuring the normal operation of the equipment.

[0005] There is some publicly available information on the application of aerogel materials in thermal insulation products, such as CN107267006A, which describes the application of silica aerogel materials in coatings. However, the performance of similar products still has many shortcomings in practical applications, requiring the addition of additional functional components, such as flame retardants. The performance of aerogel materials themselves also needs to be improved. Summary of the Invention

[0006] To address the aforementioned issues, this application proposes a hybrid aerogel, a hybrid aerogel coating, and an aerogel superhydrophobic flame-retardant insulation board. The process involves sequentially adding silanol and layered silicate dispersions to a polyimide nanofiber suspension and stirring to obtain a precursor suspension. The precursor suspension is then freeze-dried to obtain an aerogel, which is subsequently heat-treated to obtain a hybrid aerogel.

[0007] Preferably, the freeze-drying conditions for the precursor suspension are: cooling with liquid nitrogen and drying for 60-80 hours.

[0008] Preferably, the heat treatment conditions for the aerogel are: temperature 70-90℃, time 3-5h.

[0009] Furthermore, the silane coupling agent is added to the acid and stirred to hydrolyze it to generate the silanol; the silane coupling agent is one or a combination of several of methyltrimethoxysilane, vinyltrimethoxysilane, KH550, KH792, and KH602; the acid is acetic acid or hydrochloric acid, preferably acetic acid; the volume ratio of the silane coupling agent to the acid is 1:(0.1-10).

[0010] Preferably, the silane coupling agent is a compound of methyltrimethoxysilane and vinyltrimethoxysilane, with an optimal volume ratio of 1:1.

[0011] Furthermore, the layered silicate is one or a combination of montmorillonite, talc, and muscovite.

[0012] Preferably, the layered silicate is montmorillonite and muscovite, with an optimal mass ratio of 2:1.

[0013] Furthermore, the mass ratio of layered silicate to water in the layered silicate dispersion is 1:(1-200);

[0014] Furthermore, the volume ratio of the silanol and the layered silicate dispersion is 1:(0.1-20).

[0015] Furthermore, the polyimide nanofiber suspension contains 0.2wt%-0.4wt% polyimide nanofibers; the volume ratio of the layered silicate dispersion to the polyimide nanofiber suspension is 1:(1-200).

[0016] Furthermore, the layered silicate is heat-treated at 200-600℃ for 80-120 min and then dispersed in water, and magnetically stirred at 70-90℃ for 3-5 h to obtain a layered silicate dispersion.

[0017] This application also provides a hybrid aerogel coating, comprising the following components: the hybrid aerogel prepared in this application, an emulsion, a dispersant, and a thickener;

[0018] The mass ratio of the hybrid aerogel to the emulsion is 1:(1-500); the dispersant is 0.1-10% of the emulsion mass, and the thickener is 0.1-10% of the emulsion mass.

[0019] Furthermore, the emulsion is one or a combination of epoxy resin, silicone-acrylic resin, pure acrylic resin, and polyurethane.

[0020] Furthermore, the dispersant is sodium hexametaphosphate or sodium polyphosphate;

[0021] Furthermore, the thickener is hydroxyethyl cellulose or a polyurethane thickener.

[0022] This application also provides an aerogel superhydrophobic flame-retardant insulation board, which is obtained by coating the surface of the board with the hybrid aerogel coating prepared in this application and drying it.

[0023] Preferably, the drying temperature is 60-200℃.

[0024] Preferably, the coating thickness is 0.8-1.2 mm.

[0025] Preferably, the insulation board of this application can be made of inorganic non-metallic materials, such as cement board, calcium silicate board, or ceramic board; organic polymer materials, such as polystyrene board, extruded polystyrene board, or polyurethane board; or metal materials, such as aluminum plate or steel plate.

[0026] This application can bring the following beneficial effects:

[0027] 1. This invention generates aerogel in situ between layers of layered silicate, forming a sandwich structure, which improves the dispersibility of aerogel particles; polyimide nanofibers are high-strength, high-temperature resistant, and flame-retardant nanofibers, which act as "steel bars" to anchor the aerogel particles in the layered silicate; the aerogel particles have superhydrophobic properties, which can improve the waterproof performance of the applied products.

[0028] 2. The condensation reaction of silanols forms a hydrophobic layer containing siloxane groups on the surface of the aerogel; and the layered silicates can reduce the polarity of the aerogel surface, further enhancing the hydrophobicity of the aerogel; the polyimide molecular chain has many active groups that can react chemically or physically with silanols and layered silicates, which is conducive to forming a stable hybrid structure and improving the overall performance of the aerogel.

[0029] 3. Polyimide nanofibers can form a stable carbonized layer at high temperatures to hinder the transfer of heat and oxygen; in addition, layered silicates can form a barrier layer during combustion to inhibit the release of combustible gases and the transfer of heat; the silicon element in silanols generates silicon dioxide and other substances during combustion, which helps to improve the stability of the carbon layer and enhance the flame retardant effect.

[0030] 4. The aerogel contains a large number of nanoscale pores, and the air inside the pores is confined, which reduces the heat transfer of air convection. The hybrid aerogel of this application forms a three-dimensional network structure, which can inhibit heat conduction. At the same time, it has the effect of absorbing and scattering infrared radiation, which can reduce heat transfer by thermal radiation and achieve a high-efficiency heat preservation effect.

[0031] 5. The performance of hybrid aerogels obtained by combining different materials through hybridization is significantly improved. They can achieve specific hydrophobicity, flame retardancy, and thermal insulation properties, and can be applied in many fields, such as thermal insulation structural materials required in aerospace, and thermal insulation and hydrophobic exterior wall insulation and roof insulation required in the construction field.

[0032] 6. Polyimide nanofibers have a large specific surface area, which can provide more sites for the attachment and dispersion of components such as silanol and layered silicates, which is conducive to the formation of a uniform hybrid structure and increases the interfacial interaction inside the aerogel. In addition, the interweaving of nanofibers can form nanoscale pores, which work synergistically with the porous structure of the aerogel to improve the performance of the aerogel.

[0033] 7. The hybrid aerogel preparation method of this application is simple and easy to scale up. By adding other suitable components, it can be made into a coating product or applied to a board to prepare a thermal insulation board. The product has excellent performance and great market application prospects. Attached Figure Description

[0034] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0035] Figure 1 The image shows the contact angle of the aerogel superhydrophobic flame-retardant insulation board from Example 1. Detailed Implementation

[0036] Unless otherwise specified, the reagents and instruments used in the following examples are all commercially available products.

[0037]

Example 1

[0038] In this embodiment, a hybrid aerogel is prepared by the following method:

[0039] Montmorillonite was heat-treated at 450℃ for 100 min, and then the resulting material was dispersed in water at a mass ratio of 1:100. The mixture was then heated at 80℃ at 300 r / min. -1 The mixture was magnetically stirred at a high speed for 4 hours to form a uniform montmorillonite dispersion. Then, 1 mL of methyltrimethoxysilane and 1 mL of vinyltrimethoxysilane were added to 3 mL of acetic acid and stirred for 2 hours to hydrolyze the mixture into silanol. Next, 1 mL of silanol and 1 mL of the montmorillonite dispersion were sequentially added to 5 mL of 0.3 wt% polyimide nanofiber suspension and stirred at room temperature for 1 hour to form a uniform precursor suspension.

[0040] An appropriate amount of precursor suspension was placed in a mold, cooled with liquid nitrogen, and freeze-dried for 72 hours. Finally, the resulting aerogel was heat-treated in an oven at 80°C for 4 hours to obtain a hybrid aerogel.

[0041]

Example 2

[0042] In this embodiment, a hybrid aerogel is prepared by the following method:

[0043] Talc was heat-treated at 200℃ for 120 min, and then the resulting material was dispersed in water at a talc to water mass ratio of 1:1. The mixture was then heated at 90℃ at 400 r·min. -1 The mixture was magnetically stirred at a high speed for 3 hours to form a uniform talc dispersion. Then, 1 mL of KH550 was added to 0.1 mL of hydrochloric acid and stirred for 1 hour to hydrolyze it into silanol. Next, 1 mL of silanol and 0.1 mL of talc dispersion were sequentially added to 20 mL of 0.4 wt% polyimide nanofiber suspension and stirred at room temperature for 1 hour to form a uniform precursor suspension.

[0044] An appropriate amount of precursor suspension was placed in a mold, cooled with liquid nitrogen, and freeze-dried for 60 hours. Finally, the resulting aerogel was heat-treated in an oven at 70°C for 5 hours to obtain a hybrid aerogel.

[0045]

Example 3

[0046] In this embodiment, a hybrid aerogel is prepared by the following method:

[0047] Muscovite was heat-treated at 600℃ for 80 min, and then the resulting material was dispersed in water at a mass ratio of 1:200 (mucosa to water). The mixture was then heated at 70℃ at 350 r / min. -1The mixture was magnetically stirred at a high speed for 5 hours to form a uniform mica dispersion. Then, 1 mL of KH792 was added to 10 mL of acetic acid and stirred for 2 hours to hydrolyze it into silanol. Next, 1 mL of silanol and 20 mL of the mica dispersion were sequentially added to 20 mL of 0.2 wt% polyimide nanofiber suspension and stirred at room temperature for 2 hours to form a uniform precursor suspension.

[0048] An appropriate amount of precursor suspension was placed in a mold, cooled with liquid nitrogen, and freeze-dried for 80 hours. Finally, the resulting aerogel was heat-treated in an oven at 90°C for 3 hours to obtain a hybrid aerogel.

[0049]

Example 4

[0050] Montmorillonite was heat-treated at 500℃ for 100 min, and then the resulting material was dispersed in water and heated at 80℃ at 400 r·min. -1 The mixture was magnetically stirred at a high speed for 4 hours to form a uniform montmorillonite dispersion. Then, 2 mL of methyltrimethoxysilane was added to 5 mL of acetic acid and stirred for 2 hours to hydrolyze it into silanol. Next, 1 mL of silanol and 1 mL of montmorillonite dispersion were sequentially added to 5 mL of 0.3 wt% polyimide nanofiber suspension and stirred at room temperature for 1 hour to form a uniform precursor suspension.

[0051] A suitable amount of precursor suspension was placed in a mold and cooled with liquid nitrogen. The mixture was then freeze-dried for 72 hours. Finally, the resulting aerogel was heat-treated in an oven at 80°C for 4 hours to obtain a hybrid aerogel.

[0052]

Example 5

[0053] Montmorillonite was heat-treated at 600℃ for 100 min, and then the resulting material was dispersed in water and heated at 80℃ at 300 r·min. -1 The mixture was magnetically stirred at a high speed for 4 hours to form a uniform montmorillonite dispersion. Then, 2 mL of vinyltrimethoxysilane was added to 6 mL of acetic acid and stirred for 2 hours to hydrolyze it into silanol. Next, 1 mL of silanol and 1 mL of montmorillonite dispersion were sequentially added to 6 mL of 0.3 wt% polyimide nanofiber suspension and stirred at room temperature for 1 hour to form a uniform precursor suspension.

[0054] A suitable amount of precursor suspension was placed in a mold and cooled with liquid nitrogen. The mixture was then freeze-dried for 72 hours. Finally, the resulting aerogel was heat-treated in an oven at 80°C for 4 hours to obtain a hybrid aerogel.

[0055]

Example 6

[0056] In this embodiment, a hybrid aerogel is prepared by the following method:

[0057] Montmorillonite and muscovite (mass ratio 2:1) were heat-treated at 500℃ for 100 min, and then the resulting material was dispersed in water at a mass ratio of 1:150 for the composite layered silicate to water. The mixture was then heated at 80℃ at 400 r·min. -1 The mixture was magnetically stirred at a high speed for 4 hours to form a uniform composite layered silicate dispersion. Then, 1 mL of methyltrimethoxysilane and 1 mL of vinyltrimethoxysilane were added to 3 mL of acetic acid and stirred for 2 hours to hydrolyze them into silanol. Next, 1 mL of silanol and 1 mL of the composite layered silicate dispersion were sequentially added to 5 mL of 0.3 wt% polyimide nanofiber suspension and stirred at room temperature for 2 hours to form a uniform precursor suspension.

[0058] An appropriate amount of precursor suspension was placed in a mold, cooled with liquid nitrogen, and freeze-dried for 80 hours. Finally, the resulting aerogel was heat-treated in an oven at 80°C for 4 hours to obtain a hybrid aerogel.

[0059] Comparative Example 1

[0060] The only difference between Comparative Example 1 and Example 1 is that layered silicates are not added during the preparation process. The specific preparation method is as follows:

[0061] 1 mL of methyltrimethoxysilane and 1 mL of vinyltrimethoxysilane were added to 3 mL of acetic acid and stirred for 2 hours to hydrolyze them into silanol. Then, 1 mL of silanol was added to 5 mL of 0.3 wt% polyimide nanofiber suspension and stirred at room temperature for 1 hour to form a homogeneous precursor suspension.

[0062] An appropriate amount of precursor suspension was placed in a mold, cooled with liquid nitrogen, and freeze-dried for 72 hours. Finally, the resulting aerogel was heat-treated in an oven at 80°C for 4 hours to obtain the aerogel.

[0063] Comparative Example 2

[0064] The only difference between Comparative Example 2 and Example 1 is that polyimide nanofibers are not added during the preparation process. The preparation method is as follows:

[0065] Montmorillonite was heat-treated at 450℃ for 100 min, and then the resulting material was dispersed in water at a mass ratio of 1:100. The mixture was then heated at 80℃ at 300 r / min. -1 The mixture was magnetically stirred at a high speed for 4 hours to form a homogeneous montmorillonite dispersion. Then, 1 mL of methyltrimethoxysilane and 1 mL of vinyltrimethoxysilane were added to 3 mL of acetic acid solution and stirred for 2 hours to hydrolyze the mixture into silanol. 1 mL of silanol and 1 mL of the montmorillonite dispersion were then added sequentially to 5 mL of water and stirred at room temperature for 1 hour to form a homogeneous precursor suspension.

[0066] An appropriate amount of precursor suspension was placed in a mold, cooled with liquid nitrogen, and freeze-dried for 72 hours. Finally, the resulting aerogel was heat-treated in an oven at 80°C for 4 hours to obtain a hybrid aerogel.

[0067] Comparative Example 3

[0068] The only difference between Comparative Example 3 and Example 1 is that no silanol is added during the preparation process. The preparation method is as follows:

[0069] Montmorillonite was heat-treated at 450℃ for 100 min, and then the resulting material was dispersed in water at a mass ratio of 1:100. The mixture was then heated at 80℃ at 300 r / min. -1 The mixture was magnetically stirred at a high speed for 4 hours to form a uniform montmorillonite dispersion. 2 mL of the montmorillonite dispersion was added to 5 mL of 0.3 wt% polyimide nanofiber suspension, and stirred at room temperature for 1 hour to form a uniform precursor suspension.

[0070] An appropriate amount of precursor suspension was placed in a mold, cooled with liquid nitrogen, and freeze-dried for 72 hours. Finally, the resulting aerogel was heat-treated in an oven at 80°C for 4 hours to obtain a hybrid aerogel.

[0071] Comparative Example 4

[0072] The only difference between Comparative Example 4 and Example 1 is that the polyimide nanofibers were replaced with basalt fibers during the preparation process.

[0073] This application also provides a hybrid aerogel coating, the components of which include hybrid aerogel, emulsion, dispersant, and thickener, and the preparation method is as follows:

[0074] The hybrid aerogel is pulverized and an appropriate amount is added to the emulsion. Then, a dispersant and a thickener are added and stirred to obtain a hybrid aerogel coating. The mass ratio of hybrid aerogel to emulsion is 1:(1-500); the dispersant is 0.1-10% of the emulsion mass and the thickener is 0.1-10% of the emulsion mass.

[0075] The emulsion is made of one or a combination of epoxy resin, silicone-acrylic resin, pure acrylic resin, and polyurethane.

[0076] Sodium hexametaphosphate or sodium polyphosphate may be used as the dispersant;

[0077] The thickener selected is hydroxyethyl cellulose or polyurethane thickener.

[0078] Experiments revealed that the selection of emulsions, dispersants, and thickeners in the coating was a relatively optimal solution obtained after multiple experimental demonstrations. The experiments showed that if the emulsion was replaced with other commonly used resins in coatings, such as acrylic resins or phenolic resins; or the dispersant was replaced with other components such as carboxylates or quaternary ammonium salts; or the thickener was replaced with other components such as polyacrylic acid or starch, the performance of the final product insulation board (thermal insulation, hydrophobicity, flame retardancy, and aerogel stability) would decrease. This indicates that the selection of each component in the coating of this application will affect the compatibility with hybrid aerogels or other components, and thus affect the overall performance of the product.

[0079] This application also provides an aerogel superhydrophobic flame-retardant insulation board, the preparation method of which includes rolling or spraying a hybrid aerogel coating onto the surface of the board, with a coating thickness of 0.8-1.2 mm, and drying to obtain the aerogel superhydrophobic flame-retardant insulation board.

[0080] To demonstrate the experimental results, the following examples use polystyrene board as the material, but the actual application is not limited to this material.

[0081] To demonstrate the experimental results, the components and proportions of the hybrid aerogel coating are not shown in detail; only selected parts are presented.

[0082] The insulation boards obtained in the following examples were made by adding 1g of each of the hybrid aerogels obtained in Examples 1-6 and Comparative Examples 1-4 to 10g of waterborne epoxy resin emulsion, and then adding 0.1g of sodium hexametaphosphate and 0.1g of hydroxyethyl cellulose to obtain hybrid aerogel coatings, which were then rolled onto polystyrene boards (coating thickness was 0.8mm) to obtain insulation boards 1-6 and comparative boards 1-4.

[0083] Characterization of aerogel superhydrophobic flame-retardant insulation panels

[0084] The aerogel superhydrophobic flame-retardant insulation boards 1-6 and control boards 1-4 were characterized as follows:

[0085] 1. Thermal insulation effect: The thermal conductivity was obtained by testing with a transient planar heat source thermal conductivity meter;

[0086] 2. Hydrophobicity: The contact angle is obtained by testing with a contact angle measuring instrument;

[0087] 3. Flame retardancy: The flame retardancy rating is obtained according to the national standard GB 8624-2012 "Classification of Burning Performance of Building Materials and Products";

[0088] 4. Aerogel particle stability test: Wipe the surface of the insulation board with 400-grit sandpaper and observe whether any particles fall off.

[0089]

[0090] The characterization results in the table above show that the hybrid aerogel obtained in this application, when combined with other components to prepare a coating, can be distributed very evenly in the coating. When applied to the insulation board, it has very good coatability, and the aerogel particles are very stably fixed on the board. The resulting insulation board has good thermal insulation performance, good hydrophobicity, and a certain flame retardant effect.

[0091] The results of Comparative Examples 1-3 show that the addition of layered silicates, polyimide nanofibers, and silanols has a significant impact on product performance, and the hybrid aerogel material obtained by combining these technologies has excellent performance.

[0092] The results of Comparative Example 4 show that replacing polyimide nanofibers with basalt fibers results in poor fiber dispersion and poor compatibility with other components. Consequently, the resulting hybrid aerogel cannot be uniformly dispersed in the coating, affecting the performance of the final product.

[0093] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0094] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A hybrid aerogel, characterized in that, A precursor suspension was obtained by sequentially adding silanol and layered silicate dispersions to a polyimide nanofiber suspension and stirring. The precursor suspension was then freeze-dried to obtain an aerogel, which was then heat-treated to obtain a hybrid aerogel.

2. The hybrid aerogel according to claim 1, characterized in that: The silane coupling agent is added to acid and stirred to hydrolyze it to generate the silanol; The silane coupling agent is one or a combination of several of methyltrimethoxysilane, vinyltrimethoxysilane, KH550, KH792, and KH602. The acid is acetic acid or hydrochloric acid; The volume ratio of the silane coupling agent to the acid is 1:(0.1-10).

3. The hybrid aerogel according to claim 1, characterized in that: The layered silicate is one or a combination of montmorillonite, talc, and muscovite.

4. A hybrid aerogel according to claim 3, characterized in that: The layered silicate is montmorillonite and muscovite in a mass ratio of 2:

1.

5. A hybrid aerogel according to claim 1, characterized in that: The mass ratio of layered silicate to water in the layered silicate dispersion is 1:(1-200). The volume ratio of the silanol and layered silicate dispersion is 1:(0.1-20).

6. A hybrid aerogel according to claim 1, characterized in that: The polyimide nanofiber suspension contains 0.2-0.4 wt% polyimide nanofibers; the volume ratio of the layered silicate dispersion to the polyimide nanofiber suspension is 1:(1-200).

7. A hybrid aerogel according to claim 1, characterized in that: Layered silicates are heat-treated at 200-600℃ for 80-120 min and then dispersed in water. The dispersion is then magnetically stirred at 70-90℃ for 3-5 h to obtain a layered silicate dispersion.

8. A hybrid aerogel coating, characterized in that, It includes the following components: the hybrid aerogel, emulsion, dispersant, and thickener as described in any one of claims 1-7; The mass ratio of the hybrid aerogel to the emulsion is 1:(1-500); the dispersant is 0.1-10% of the emulsion mass, and the thickener is 0.1-10% of the emulsion mass.

9. A hybrid aerogel coating according to claim 8, characterized in that, The emulsion is one or a combination of epoxy resin, silicone-acrylic resin, pure acrylic resin, and polyurethane. The dispersant is sodium hexametaphosphate or sodium polyphosphate; The thickener is hydroxyethyl cellulose or polyurethane thickener.

10. An aerogel superhydrophobic flame-retardant insulation board, characterized in that, After drying, an aerogel superhydrophobic flame-retardant insulation board is obtained by coating the surface of the board with the hybrid aerogel coating as described in any one of claims 8-9. The coating thickness is 0.8-1.2 mm.

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