Aerogel thermal barrier coating, thermal barrier coating and its application in thermal insulation of vehicle wall

Abstract

The application provides an aerogel thermal insulation coating, a thermal insulation coating and application of the thermal insulation coating in vehicle wall thermal insulation. The aerogel thermal insulation coating comprises 0.5-0.75 wt% of a wetting dispersant, 0.1-0.5 wt% of an anti-settling agent, 0.1-0.5 wt% of a thickening agent, 20-35 wt% of a high molecular polymer latex, 15-20 wt% of hollow glass microbeads, 2.5-5 wt% of a silicon-based aerogel powder and a solvent; wherein the anti-settling agent comprises lithium magnesium silicate, and the wetting dispersant comprises a combination of one or more of a copolymer containing a pigment affinity group, an acidic polymer amine salt. The thermal insulation coating formed by the aerogel thermal insulation coating has a low thermal conductivity, excellent thermal insulation performance, good bonding strength and flexibility, and is suitable for application in vehicle wall thermal insulation, in particular for improving the thermal insulation effect of the inner wall of an armored vehicle cabin.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of thermal insulation coating, and particularly relates to an aerogel thermal insulation coating, a thermal insulation coating, and application of the thermal insulation coating in thermal insulation of a vehicle wall. BACKGROUND

[0002] The body and inner wall components of armored vehicles and tanks are mostly metal materials with good heat conduction performance, and these materials have obvious heat bridge effect. The vehicle runs in various geographical environments, and the temperature in the cabin is greatly affected by the environment. In summer, the highest temperature in tropical and subtropical regions will reach 50-60 degrees, and the possibility of heatstroke of the cabin personnel is very large; in winter, the temperature in temperate and high-cold regions will be as low as several tens of degrees below zero, and the cabin personnel may be frozen. On the other hand, with the progress of science and technology, these vehicles are equipped with more and more advanced electronic equipment, such as communication, various electric control and reconnaissance, etc. These devices need to operate in an appropriate temperature range, and too high or too low temperature may slow down the operation of the equipment, and even cause the equipment to malfunction and the system to crash, thereby seriously damaging the combat effectiveness of the vehicle and endangering the life safety of the soldiers.

[0003] In order to improve the comfort of the cabin and provide a suitable temperature environment for the stable operation of the electronic equipment, modern armored vehicles are equipped with air conditioners. However, if the cabin materials made of metal materials with good heat conduction performance are not subjected to thermal insulation treatment, the temperature in the cabin is difficult to stabilize and maintain, and the precious oil of the vehicle will also be wasted for air conditioning refrigeration. SUMMARY

[0004] To solve all or part of the above technical problems, the present application provides the following technical solutions:

[0005] One of the purposes of the present application is to provide an aerogel thermal insulation coating, which comprises 0.5-0.75wt% of a wetting dispersant, 0.1-0.5wt% of an anti-settling agent, 0.1-0.5wt% of a thickening agent, 20-35wt% of a high molecular polymer latex, 15-20wt% of hollow glass microbeads, 2.5-5wt% of a silicon-based aerogel powder, and a solvent; wherein the anti-settling agent comprises magnesium lithium silicate, and the wetting dispersant comprises one or a combination of more than one of a copolymer containing a pigment affinity group, an acid polymer amine salt.

[0006] The hollow glass beads and aerogel have relatively light specific gravity, are easy to float and gather on the upper layer of the coating, the traditional water-based thickening agent is insufficient to solve the floating problem of the microbeads and aerogel, and thus long-time stirring is needed during use of the coating, or the uniformly stirred coating is stratified after standing for a period of time, resulting in frequent stirring during use, and causing inconvenience in construction. The application uses magnesium lithium silicate as a de-sedimentation agent, and cooperates with the thickening agent to use, so that the magnesium lithium silicate forms a unique "card house" structure in the solvent (such as water), solves the floating problem of the microbeads and aerogel, and the coating can be used after opening or after short-time stirring (within 3 minutes), so that time is saved and work efficiency is improved. Compared with the existing water-based bentonite as a de-sedimentation agent, the water gel formed by the magnesium lithium silicate is transparent and pure in color, and the prepared coating has a good appearance; in addition, compared with sodium-based and potassium-based monovalent silicate bentonite, the lithium ion has a smaller radius and a stronger permeability, and thus the coating is more dense, and has better mechanical strength and water resistance, alkali resistance and other properties.

[0007] The coating formed by the aerogel thermal insulation coating has a low thermal conductivity, excellent thermal insulation performance, good adhesion and flexibility.

[0008] In some embodiments, the copolymer containing a pigment affinity group includes an acrylate copolymer. The acrylate copolymer includes Disperbyk-190 and / or Disperbyk-191, but is not limited thereto.

[0009] In some embodiments, the acidic polymer ammonium salt includes a polycarboxylic acid ammonium salt.

[0010] In some embodiments, the polycarboxylic acid ammonium salt includes SN-5029, but is not limited thereto.

[0011] In some embodiments, the thickening agent includes a polyurethane-based thickening agent, and the polyurethane-based thickening agent includes one or a combination of a plurality of urea-modified polyurethane-based thickening agents, but is not limited thereto.

[0012] In some embodiments, the thickening agent includes one or a combination of a plurality of Vesmody U604, Acrysol RM-8W or BYK-425, but is not limited thereto.

[0013] In some embodiments, the high-molecular polymer latex includes a polyacrylate latex obtained by emulsion polymerization. The silicon-based aerogel is oleophilic but not hydrophilic, contains a non-emulsion type high-molecular polymer including an alcohol cosolvent, and a non-emulsion type water-soluble polyacrylate, which can cause the voids of the aerogel to be completely filled with resin and become ordinary superfine powder fillers, losing the thermal insulation and heat preservation effect; the use of the latex can allow the voids of the aerogel to be relatively completely preserved, and thus the thermal insulation and heat preservation effect of the coating is not affected.

[0014] In some embodiments, the polyacrylate latex has a solid content of 48-52% and a pH of 7.0-9.0.

[0015] The hollow glass microspheres may be any microspheres used in existing thermal insulation coatings, such as one or a combination of 3M's K20, S15, or K25, but are not limited thereto.

[0016] In some embodiments, the density of the hollow glass microspheres is 0.15 to 0.3 g / cm 3 If the density of the hollow glass microspheres used is too low, the microspheres will be too light and floaty, making feeding and dispersion difficult. If the density is too high, the thermal insulation effect of the resulting coating will be unsatisfactory.

[0017] In some embodiments, the particle size of the hollow glass microspheres is 15 to 110 μm. Appropriate particle size distribution of the hollow glass microspheres is beneficial to the integrity of the coating without cracking.

[0018] The silicon-based aerogel can be any aerogel used in existing thermal insulation coatings, and its main material is silicon dioxide.

[0019] In some embodiments, the silicon aerogel powder has a porosity of 90-95% and a specific surface area of ​​600-800 m 2 / g. Aerogels with suitable porosity and specific surface area can fully exert the thermal insulation performance of aerogels.

[0020] In some embodiments, the aerogel thermal insulation coating further includes 0.1 to 0.5 wt % of a bactericide, which is used at least to impart a bactericidal function to the coating. Any bactericide with a bactericidal function in existing coatings may be used, including, for example, isothiazolinone bactericides such as Kasson, CIT / MIT, etc., which have a light yellow-green transparent liquid appearance, but are not limited thereto.

[0021] In some embodiments, the solvent of the aerogel thermal insulation coating includes water. For example, in a typical embodiment, the aerogel thermal insulation coating includes the aforementioned mass percentages of a wetting and dispersing agent, an anti-settling agent, a thickener, a polymer latex, hollow glass microspheres, a silicon-based aerogel powder, and an optional fungicide, with the balance being water.

[0022] In some embodiments, the preparation method of the aerogel thermal insulation coating comprises: weighing the raw materials according to the mass percentage; adding the solvent, wetting agent dispersant, anti-settling agent, thickening agent and optional bactericide into a container in sequence, and dispersing at high speed until the anti-settling agent is completely dissolved, then adding the silicon-based aerogel powder and dispersing uniformly, and then starting low-speed stirring, and then adding the polymer latex and hollow glass microbeads and continuing to disperse until no particles are present, to obtain the aerogel thermal insulation coating. After preparation, the aerogel thermal insulation coating can be detected, and after passing the detection, the aerogel thermal insulation coating is filtered and packaged.

[0023] The second object of the present application is to provide a thermal insulation coating, which comprises the cured product of the aerogel thermal insulation coating according to any one of the technical solutions described above.

[0024] The third object of the present application is to provide a vehicle wall structure, which comprises a vehicle wall base body and a coating layer arranged on the vehicle wall base body, and the coating layer comprises the thermal insulation coating according to any one of the technical solutions described above.

[0025] In some embodiments, the material of the vehicle wall base body comprises metal, such as steel and the like.

[0026] In some embodiments, the coating layer further comprises a rust-proof layer, which is arranged on the surface of the base body and under the thermal insulation coating.

[0027] In some embodiments, the thickness of the thermal insulation coating is between 2 and 5 mm.

[0028] The fourth object of the present application is to provide the application of the aerogel thermal insulation coating according to any one of the technical solutions described above or the thermal insulation coating in the thermal insulation of a vehicle wall. The aerogel thermal insulation coating and the thermal insulation coating provided by the present application are particularly suitable for improving the thermal insulation effect of the inner wall of a relatively closed environment, such as a door crane cab, an armored vehicle cabin and the like.

[0029] In some embodiments, the vehicle comprises an armored vehicle, such as a tank and the like.

[0030] In some embodiments, the thermal insulation coating formed by the aerogel thermal insulation coating is arranged on the inner wall of the vehicle wall.

[0031] In some embodiments, the coating process of the aerogel thermal insulation coating on the vehicle wall comprises the steps of base layer inspection and treatment, rust-proof primer construction and aerogel thermal insulation coating construction, and specifically comprises:

[0032] The vehicle wall base material is cleaned to ensure that the surface of the base material is free of dust, floating slurry, rust spots and mold spots;

[0033] Applying an anti-rust primer on the substrate to form an anti-rust layer, wherein the anti-rust primer includes, but is not limited to, an epoxy primer;

[0034] The surface of the anti-rust layer is covered with the aerogel thermal insulation coating of the present invention to form a thermal insulation coating.

[0035] The method of coating the substrate with an anti-rust primer and the surface of the anti-rust layer with an aerogel thermal insulation coating may be achieved by coating, spraying or other methods that can achieve comparable effects, and the present invention does not impose any particular restrictions on this.

[0036] In a typical embodiment, the method of applying the aerogel thermal insulation coating to the surface of the rust-proof layer employs a spraying method, with the number of spraying applications being, for example, two or more, and the thickness of a single spraying application being less than 1 mm. After each spraying application, the next spraying application is performed after the coating surface is dry. According to GB / T 1728-1979 (1989), "Determination of Drying Time of Paint and Putty Films," surface dryness can be determined using the cotton ball blowing method or the finger touch method. With the cotton ball blowing method, a cotton ball is gently placed on the paint film surface. The cotton ball is held 10-15 cm from the mouth and gently blows horizontally. If the cotton ball can be blown away without leaving any residue on the film surface, the surface is considered dry. With the finger touch method, the paint film surface is lightly touched with a finger. If it feels slightly sticky but no paint sticks to the finger, the surface is considered dry.

[0037] The interval between the completion of aerogel thermal insulation coating construction and the construction of the next process should generally not be less than 12 hours, but should be determined based on the ambient temperature and humidity conditions at the construction site.

[0038] The aerogel thermal insulation coating can be applied immediately after opening without stirring. However, a short stirring time, such as using a handheld blender for 2-3 minutes, is sufficient. If the coating is too viscous for spraying, add 5-10% water to dilute it as needed.

[0039] Compared with the prior art, the present invention has at least the following technical effects:

[0040] (1) The present invention uses lithium magnesium silicate as an anti-settling agent and is used together with a thickener, which can enable lithium magnesium silicate to form a unique "house of cards" structure in the solvent, solving the floating problem of microbeads and aerogels. The coating can be used as soon as the cover is opened or after a short period of stirring, which can save time and improve work efficiency. In addition, since the lithium ion radius contained in lithium magnesium silicate is smaller and the permeability is stronger, the obtained coating is denser, which is conducive to further improving the mechanical strength, water resistance and alkali resistance of the coating;

[0041] (2) The coating formed by the aerogel thermal insulation coating provided by the present invention has low thermal conductivity, excellent thermal insulation performance, good adhesion and flexibility;

[0042] (3) The aerogel thermal insulation coating provided by the present invention is applied to the inner wall of the armored vehicle cabin. The coating has an extremely low thermal conductivity and excellent thermal insulation performance. The excellent adhesion and flexibility also make the coating extremely adaptable to the high-intensity bumpy movement of armored vehicles in various terrain environments. It can greatly improve the thermal insulation performance of the cabin in winter and greatly reduce the cooling energy consumption of air conditioning in summer, thereby improving the comfort of combat personnel in the cabin and maintaining the sensitivity and stability of various electronic instruments in the cabin, thereby improving the combat performance of armored vehicles including tanks. DETAILED DESCRIPTION

[0043] The technical solutions of the present invention are described in detail below in conjunction with specific embodiments so that those skilled in the art can better understand and implement the technical solutions of the present invention. The specific functional details disclosed herein should not be interpreted as limiting, but rather as a basis for the claims and as a representative basis for teaching those skilled in the art to employ the present invention in various ways in virtually any appropriate detailed embodiment.

[0044] Unless otherwise specified, the raw materials and reagents provided in the present invention are commercially available.

[0045] Example 1

[0046] This embodiment provides an aerogel thermal insulation coating, which includes, by weight percentage, 0.65% of a wetting and dispersing agent, 0.5% of an anti-settling agent, lithium magnesium silicate, 0.15% of a thickener, 0.5% of a fungicide, 20% of a high molecular polymer latex, 18% of hollow glass microspheres, 2.5% of a silicone gel powder, and the balance, deionized water.

[0047] Among them, the wetting and dispersing agent is Disperbyk-190, lithium magnesium silicate is purchased from Nanjing Hemmings, the thickener is VesmodyU604, the fungicide is isothiazolinone (Kason), the high molecular polymer latex is EC-1791 from Dow Chemical Company, the hollow glass microspheres are K20 from 3M Company, and the silicone gel powder is purchased from Shenzhen Zhongning Company.

[0048] The preparation process of the above-mentioned aerogel thermal insulation coating is as follows: prepare the materials according to the above-mentioned mass percentages; add deionized water, wetting agent dispersant, anti-settling agent, thickener, and fungicide into a stirring tank in order, disperse at high speed until the anti-settling agent is completely dissolved, then add silicon aerogel powder until it is evenly dispersed, then stir at low speed, and add high molecular polymer latex and hollow glass microbeads, and continue to disperse until no particles are visible to the naked eye, thereby obtaining the above-mentioned coating; test the obtained coating, filter it, and package it after passing the test.

[0049] The above-mentioned coating is used to coat the interior wall of the cabin, as follows:

[0050] Clean the steel plate base of the armored vehicle cabin wall to ensure that the base surface is free of dust, laitance, rust, mildew and other impurities;

[0051] After cleaning, anti-rust primer is applied to the base layer of the cabin interior wall. The anti-rust primer used is an epoxy-based anti-rust primer purchased from Xinxinhe New Materials, model XH4210-2012.

[0052] Then, the aerogel insulation coating prepared above is sprayed on the inner wall of the cabin treated with anti-rust primer. Before spraying, the coating is evenly stirred with a portable mixer for 2 minutes. If the coating is too viscous and not conducive to spraying, no more than 10% of clean water is added for dilution. The number of spraying is 3 times. After each spraying, the coating needs to be dry before the next spraying construction can be carried out. The thickness of a single spraying is controlled within 1 mm.

[0053] Example 2

[0054] This embodiment provides an aerogel thermal insulation coating, which includes, by weight percentage, 0.6% of a wetting and dispersing agent, 0.35% of an anti-settling agent, lithium magnesium silicate, 0.25% of a thickener, 0.35% of a fungicide, 27.5% of a high molecular polymer latex, 15% of hollow glass microspheres, 5% of a silicone gel powder, and the balance, deionized water.

[0055] Among them, the wetting and dispersing agent is Disperbyk-191, lithium magnesium silicate is purchased from BYK China, the thickener is Acrysol RM-8W, the bactericide is isothiazolinone (CIT / MIT), the high molecular polymer latex is AC-261 from Dow Chemical, the hollow glass microspheres are S15 from 3M, and the silicone gel powder is purchased from Shenzhen Zhongning.

[0056] The preparation process of the above-mentioned aerogel thermal insulation coating is as follows: prepare the materials according to the above-mentioned mass percentages; add deionized water, wetting agent dispersant, anti-settling agent, thickener, and fungicide into a stirring tank in order, disperse at high speed until the anti-settling agent is completely dissolved, then add silicon aerogel powder until it is evenly dispersed, then stir at low speed, and add high molecular polymer latex and hollow glass microbeads, and continue to disperse until no particles are visible to the naked eye, thereby obtaining the above-mentioned coating; test the obtained coating, filter it, and package it after passing the test.

[0057] The above-mentioned coating is used to coat the interior wall of the cabin, as follows:

[0058] Clean the base layer of the interior wall of the armored combat vehicle cabin to ensure that the surface of the base layer is free of dust, laitance, rust, mildew and other impurities;

[0059] After cleaning, anti-rust primer is applied to the base layer of the cabin interior wall. The anti-rust primer used is an epoxy-based anti-rust primer purchased from Xinxinhe New Materials, model XH4211-6065W.

[0060] Then, the aerogel insulation coating prepared above was sprayed on the inner wall of the cabin treated with anti-rust primer. Before spraying, the coating was evenly stirred with a portable mixer for 2 minutes. If the coating was too viscous and not conducive to spraying, 8% of clean water was added for dilution. The spraying was performed 3 times. After each spraying, the coating surface needed to dry before the next spraying could be carried out. The thickness of a single spraying was 1 mm.

[0061] Example 3

[0062] This embodiment provides an aerogel thermal insulation coating, which includes, by weight percentage, 0.5% of a wetting and dispersing agent, 0.15% of an anti-settling agent, lithium magnesium silicate, 0.5% of a thickener, 0.15% of a fungicide, 35% of a high molecular polymer latex, 16% of hollow glass microspheres, 4% of a silicone gel powder, and the balance, deionized water.

[0063] Among them, the wetting and dispersing agent is the ammonium salt solution of acidic polymer SN-5029, lithium magnesium silicate is from Shijiazhuang Jiuding Technology Development Co., Ltd., the thickener is urea-modified polyurethane thickener BYK-425, the bactericide is isothiazolinone (CIT / MIT), the high molecular polymer latex is RS-2788 from Badfu Group, the hollow glass microspheres are K25 from 3M, and the silicone gel powder is purchased from Shenzhen Zhongning.

[0064] The preparation process of the above-mentioned aerogel thermal insulation coating is as follows: prepare the materials according to the above-mentioned mass percentages; add deionized water, wetting agent dispersant, anti-settling agent, thickener, and fungicide into a stirring tank in order, disperse at high speed until the anti-settling agent is completely dissolved, then add silicon aerogel powder until it is evenly dispersed, then stir at low speed, and add high molecular polymer latex and hollow glass microbeads, and continue to disperse until no particles are visible to the naked eye, thereby obtaining the above-mentioned coating; test the obtained coating, filter it, and package it after passing the test.

[0065] The above-mentioned coating is used to coat the interior wall of the cabin, as follows:

[0066] Clean the base layer of the interior wall of the armored combat vehicle cabin to ensure that the surface of the base layer is free of dust, laitance, rust, mildew and other impurities;

[0067] After cleaning, anti-rust primer is applied to the base layer of the cabin interior wall. The anti-rust primer used is an epoxy-based anti-rust primer purchased from Xinxinhe New Materials, model XH4230-1726.

[0068] Then, the aerogel insulation coating prepared above is sprayed on the inner wall of the cabin treated with anti-rust primer. Before spraying, the coating is evenly stirred with a portable mixer for 2 minutes. If the coating is too viscous and not conducive to spraying, 5% of clean water is added for dilution. The number of spraying is 2 times. After each spraying, the coating needs to be dry before the next spraying construction can be carried out. The thickness of a single spraying is 1 mm.

[0069] Example 4

[0070] The only difference between Example 4 and Example 1 is that the aerogel insulation coating of Example 4 includes 0.75% of a wetting dispersant, 0.1% of an anti-settling agent lithium magnesium silicate, 0.1% of a thickener, 0.1% of a fungicide, 20% of a high molecular polymer latex, 20% of hollow glass microspheres, 4% of a silicone gel powder, and the balance deionized water; the rest is the same as in Example 1.

[0071] Comparative Example 1

[0072] Comparative Example 1 differs from Example 1 only in that the coating in Comparative Example 1 does not contain lithium magnesium silicate, and the remaining steps are the same as in Example 1. It was found that during storage of the coating, the hollow glass microspheres and aerogels tended to float and aggregate on the coating surface, requiring prolonged stirring to achieve uniformity during use.

[0073] Comparative Example 2

[0074] The only difference between Comparative Example 2 and Example 1 is that the lithium magnesium silicate in the coating in Example 1 is replaced with expanded water-based bentonite SHV. The rest of the process is the same as in Example 1. It is found that when the coating is stored, a layer of water floats on the surface and must be stirred before use. The color of the resulting coating is grayish yellow.

[0075] Comparative Example 3

[0076] The only difference between Comparative Example 3 and Example 1 is that the polyacrylate latex in the coating in Example 1 is replaced with non-emulsion polyacrylate, and the thermal insulation effect of the coating is worse than that of Example 1.

[0077] Table 1 shows the relevant properties of the thermal insulation coatings prepared in the embodiments and comparative examples of the present invention, wherein the coating thickness is tested according to GB / T 13452.2-2008, the coating thermal conductivity is tested according to Appendix A of GB / T 25261-2018, the coating bonding strength is tested according to HG / T 4567-2013, and the thermal insulation temperature difference is tested according to Appendix B of GB / T 25261-2018.

[0078] Table 1 Properties of coatings prepared in Examples of the present invention and Comparative Examples

[0079]

[0080] The various aspects, embodiments, features and examples of the present invention should be considered as illustrative in all respects and are not intended to limit the present invention, the scope of which is defined solely by the claims. Other embodiments, modifications and uses will be apparent to those skilled in the art without departing from the spirit and scope of the invention as claimed.

[0081] In addition, the inventors of this case also referred to the aforementioned embodiments and conducted experiments using other raw materials, process operations, and process conditions described in this specification, and obtained relatively ideal results.

[0082] Although the present invention has been described with reference to illustrative embodiments, it will be understood by those skilled in the art that various other changes, omissions, and / or additions may be made and that substantial equivalents may be substituted for the elements of the embodiments without departing from the spirit and scope of the present invention. Additionally, many modifications may be made to adapt specific circumstances or materials to the teachings of the present invention without departing from the scope of the present invention. Therefore, it is not intended herein to limit the present invention to the disclosed specific embodiments for carrying out the present invention, but rather to include all embodiments within the scope of the appended claims. Furthermore, unless specifically stated, any use of the terms first, second, etc. does not indicate any order or importance, but rather uses the terms first, second, etc. to distinguish one element from another.

Claims

1. An aerogel thermal insulation coating, characterized in that: include: 0.5-0.75wt% of a wetting and dispersing agent, 0.1-0.5wt% of an anti-settling agent, 0.1-0.5wt% of a thickener, 20-35wt% of a high molecular weight polymer latex, 15-20wt% of hollow glass microspheres, 2.5-5wt% of a silicon aerogel powder, and a solvent; The anti-settling agent includes lithium magnesium silicate, the wetting and dispersing agent includes one or more of a copolymer containing pigment affinity groups and an acidic polymer ammonium salt; and the high molecular polymer latex includes polyacrylate latex obtained by emulsion polymerization.

2. The aerogel thermal insulation coating according to claim 1, characterized in that: The copolymer containing pigment-affinity groups includes an acrylate copolymer.

3. The aerogel thermal insulation coating according to claim 2, characterized in that: The copolymer containing pigment-affinic groups includes Disperbyk-190 and / or Disperbyk-191.

4. The aerogel thermal insulation coating according to claim 1, characterized in that: The acidic polymer ammonium salts include polycarboxylic acid ammonium salts.

5. The aerogel thermal insulation coating according to claim 4, characterized in that: The polycarboxylate ammonium salts include SN-5029.

6. The aerogel thermal insulation coating according to claim 1, characterized in that: The thickener includes a polyurethane thickener, and the polyurethane thickener includes a urea-modified polyurethane thickener.

7. The aerogel thermal insulation coating according to claim 6, characterized in that: The thickener includes one or a combination of multiple of Vesmody U604, Acrysol RM-8W or BYK-425.

8. The aerogel thermal insulation coating according to claim 1, characterized in that: The polyacrylate latex has a solid content of 48-52% and a pH value of 7.0-9.

0.

9. The aerogel thermal insulation coating according to claim 1, characterized in that: The density of the hollow glass microspheres is 0.15-0.38 g / cm 3 , and / or, the particle size of the hollow glass microspheres is 15~110μm.

10. The aerogel thermal insulation coating according to claim 1, characterized in that: The silicon aerogel powder has a porosity of 90-95% and a specific surface area of ​​600-800 m 2 / g.

11. The aerogel thermal insulation coating according to claim 1, characterized in that: The aerogel thermal insulation coating further comprises 0.1 to 0.5 wt % of a fungicide.

12. The aerogel thermal insulation coating according to claim 11, characterized in that: The fungicide is an isothiazolinone fungicide.

13. The aerogel thermal insulation coating according to claim 1, characterized in that: The solvent of the aerogel thermal insulation coating includes water.

14. A thermal insulation coating, characterized by: The thermal insulation coating comprises a cured product of the aerogel thermal insulation coating according to any one of claims 1 to 13.

15. A vehicle wall structure, characterized in that: It comprises a vehicle wall substrate and a coating covered on the vehicle wall substrate, wherein the coating comprises the thermal insulation coating according to claim 14.

16. The vehicle wall structure according to claim 15, characterized in that: The thickness of the thermal insulation coating is 2-5 mm.

17. The vehicle wall structure according to claim 15, characterized in that: The vehicle wall substrate is made of metal.

18. Use of the aerogel thermal insulation coating according to any one of claims 1 to 13 or the thermal insulation coating according to claim 14 in thermal insulation of vehicle walls.

19. The use according to claim 18, characterized in that The vehicle includes an armored fighting vehicle.

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