Aerogel slurries and methods for making same, and high performance aerogel coatings and methods for making same

Abstract

The present application relates to the technical field of paint, in particular to a kind of aerogel slurry and preparation method thereof and high-performance aerogel paint and preparation method thereof.The preparation method of the aerogel slurry provided by the present application not only effectively wets aerogel powder, makes it better fusion with acrylic emulsion, avoids the shortcomings such as poor mechanical property of aerogel paint and easy cracking;At the same time, it ensures that the nano-microporous structure inside the aerogel is not damaged, and the heat insulation performance of the coating is reduced to the greatest extent.

Description

Technical Field

[0001] This invention relates to the field of coating technology, and in particular to an aerogel slurry and its preparation method, as well as a high-performance aerogel coating and its preparation method. Background Technology

[0002] With the rapid development of society and economy and the advancement of technology, the demand for functional thermal insulation materials is constantly increasing across all industries. The thermal insulation material market has shown a leapfrog development trend, with an annual compound growth rate of 12%. If the thermal insulation of related equipment and facilities is inadequate, heat will be severely lost. Taking crude oil pipelines as an example, the energy consumed annually due to pipeline heat dissipation accounts for about one-third of the total energy consumption. Moreover, after heat loss, the fluidity of the medium is greatly reduced, seriously affecting oil-water separation and transportation, and may even affect the quality of crude oil.

[0003] Aerogels are lightweight and have excellent thermal insulation properties. Their porous nanomaterials possess high specific surface area, high porosity, low density, and extremely low thermal conductivity. The unique formulation design of aerogel thermal insulation coatings perfectly combines aerogel powder with water-based emulsions, maximizing the preservation of the aerogel's nanoporous structure and excellent thermal insulation performance. They also feature excellent high and low temperature resistance, ease of application, energy saving, and environmental friendliness.

[0004] Aerogel powders possess high hydrophobicity, with a hydrophobicity as high as 90%. However, the preparation of waterborne aerogel coatings requires proper wetting of the aerogel powder to reduce its hydrophobicity, allowing the aerogel powder to bond with the waterborne emulsion and ultimately form a high-performance thermal insulation coating. However, in existing technologies, improper wetting allows water and emulsions in the coating to easily enter the micropores of the aerogel, causing the framework to collapse, losing its nanoporous structure, and consequently, its thermal insulation properties, thus limiting the application of aerogel coatings.

[0005] Therefore, how to obtain an aerogel slurry that does not easily allow water and emulsions in the coating to enter the micropores of the aerogel, causing the skeleton to collapse, lose the nanoporous structure, and thus lose the thermal insulation performance, is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] To address the shortcomings of the prior art mentioned in the background section, the present invention provides a method for preparing aerogel slurry, comprising the following preparation methods:

[0007] S100. Mix water with silane coupling agent and wetting and dispersing agent evenly, slowly add a portion of aerogel powder, disperse at low speed for 5-10 minutes, until the aerogel powder is slightly soluble in water and no longer disperses.

[0008] S200, then high-speed dispersion for 15-20 min to obtain a uniformly mixed solution; slowly add aerogel powder in the dispersed state, then add a portion of silane coupling agent and wetting and dispersing agent and mix evenly, disperse at low speed for 5-10 min until the aerogel powder is slightly soluble in the solution and no longer drifts, then high-speed dispersion for 15-20 min to obtain a uniformly mixed viscous solution.

[0009] S2300: Slowly add the remaining aerogel powder to the viscous solution while it is in a dispersed state. Finally, add the remaining silane coupling agent and wetting and dispersing agent and mix evenly. Disperse at low speed for 5-10 minutes until the aerogel powder is slightly soluble in the solution and no longer disperses. Then, disperse at high speed for 15-20 minutes to obtain a uniformly mixed aerogel slurry.

[0010] In some embodiments, further, in S100, S200 and S300, the mass ratio of the added aerogel powder is 1:1:1; in S100, S200 and S300, the mass ratio of the added silane coupling agent is 1:1:1, and the mass ratio of the added wetting and dispersing agent is 1:1:1.

[0011] In some embodiments, the raw materials further include, by weight, 70-80 parts water, 1-3 parts silane coupling agent, 1-3 parts wetting and dispersing agent, and 15-25 parts SiO2 aerogel.

[0012] In some embodiments, the silane coupling agent is one or more combinations of KH560 and KH550, and the wetting and dispersing agent is one or more combinations of 104E, X-405, and Tego 755W.

[0013] In some embodiments, the rotational speed of the low-speed dispersion is 300-500 r / min, and the rotational speed of the high-speed dispersion is 2700-3300 r / min, preferably 3000 r / min.

[0014] The present invention also provides an aerogel slurry prepared by any of the aerogel slurry preparation methods described above.

[0015] The present invention also provides a high-performance aerogel coating, comprising the aerogel slurry as described above, wherein the components by weight include: aerogel slurry, acrylic emulsion, hollow microspheres, film additives, defoamer and thickener;

[0016] The hollow microspheres comprise 20-30 parts, and the particle size D50 of the hollow glass microspheres is ≤60 micrometers, meaning that 50% of the particles have a particle size ≤60 micrometers.

[0017] The ratio of hollow microspheres to aerogel slurry is 2-3:4-5.5.

[0018] In some embodiments, the components further include, by weight: 40-55 parts aerogel slurry, 20-30 parts acrylic emulsion, 20-30 parts hollow microspheres, 1-2 parts film-forming aid, 0.3-0.5 parts defoamer, and 0.1-0.5 parts thickener.

[0019] In some embodiments, the acrylic emulsion is one or more combinations of IC-1002, 6016, and 6086.

[0020] In some embodiments, the film-forming aid is a dodecyl alcohol ester; the defoamer is one or more combinations of Tego810, Tego901W, and BYK-028; and the thickener is one or more combinations of RM-2020, PU1191, and 299.

[0021] The present invention also provides a method for preparing the high-performance aerogel coating as described above, comprising the following steps:

[0022] According to the raw material ratio, the acrylic emulsion and film-forming aid are slowly added to the aerogel slurry in sequence and stirred evenly.

[0023] While stirring, slowly add the thickener and disperse it evenly at high speed;

[0024] While stirring, slowly add hollow glass microspheres and stir at low speed until homogeneous;

[0025] After testing and sieving, the high-performance aerogel coating is obtained.

[0026] Preferably, the high-speed dispersion speed is 300-500 r / min, and the low-speed stirring speed is 3700-3300 r / min.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The aerogel slurry preparation method provided by this invention not only effectively wets the aerogel powder, allowing it to blend well with the acrylic emulsion and avoiding the disadvantages of poor mechanical properties and easy cracking of aerogel coatings, but also ensures that the nanoporous structure inside the aerogel is not damaged, thus maximizing the thermal insulation performance of the coating.

[0029] The high-performance aerogel coating provided by this invention uses acrylic emulsion, hollow glass microspheres and aerogel slurry in a specific ratio of acrylic emulsion: aerogel slurry: hollow microspheres = 20-30: 40-55: 20-30 parts, which effectively reduces the risk of coating cracking. Even if a single coating reaches a dry film thickness of 5mm, the coating remains intact.

[0030] Among these, acrylic emulsions exhibit better fluidity and viscosity when absorbing a specific proportion of aerogel and hollow microspheres. Preferably, the hollow glass microspheres used have a particle size D50 ≤ 60 μm. At this size, the acrylic emulsion can uniformly fill the gaps between the hollow microspheres and effectively strengthen the bonds between the microsphere walls. If the hollow microsphere particle size is too large, the acrylic emulsion fills a large amount of the gaps between the hollow microspheres, failing to completely coat them and causing coating cracking. If the hollow microsphere particle size is too small, the hollow microspheres cannot fully fill the entire internal space of the coating, leading to stress concentration and layer cracking during drying. This method replaces traditional crack-resistant technologies such as glass fiber and ceramic fiber. Furthermore, due to the smooth surface of the hollow glass microspheres, the resulting paint film appearance is significantly better than that of coatings made with added fibrous fillers. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. The technical features designed in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be noted that all terms used in this invention (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains, and should not be construed as limiting the invention; it should be further understood that the terms used in this invention should be understood to have the same meaning as those in the context of this specification and in the relevant field, and should not be understood in an idealized or overly formal sense, except as expressly defined in this invention.

[0033] This invention provides a preferred practical example of a method for preparing high-performance aerogel coatings, which includes the following steps:

[0034] Acrylic emulsion and film-forming aid are slowly added to the aerogel slurry in sequence and stirred evenly. While stirring, thickener is slowly added and dispersed evenly at high speed. Then, hollow glass microspheres are slowly added while stirring and stirred evenly at low speed. After testing and sieving, the high-performance aerogel coating is obtained.

[0035] in,

[0036] 1. The specific formula for the paint is as follows:

[0037] By weight, its components include 40-55 parts aerogel slurry, 20-30 parts acrylic emulsion, 20-30 parts hollow microspheres, 1-2 parts film-forming aid, 0.3-0.5 parts defoamer, and 0.1-0.5 parts thickener.

[0038] The acrylic emulsion thereon is one or more combinations of IC-1002, 6016, and 6086.

[0039] The hollow glass microspheres mentioned therein have a particle size D50≤60.

[0040] The film-forming aid is one or more of the following: dodecyl alcohol ester, dipropylene glycol butyl ether, and diethylene glycol butyl ether.

[0041] The defoamers mentioned are Tego810, Tego901W, and BYK-028.

[0042] The thickeners mentioned are RM-2020, PU1191, and 299.

[0043] 2. The aerogel slurry is prepared by uniformly dispersing a silane coupling agent, a wetting and dispersing agent, and aerogel in deionized water. The specific preparation method is as follows:

[0044] The preparation process of the aerogel slurry is as follows: Water is mixed evenly with 1 / 3 each of the silane coupling agent and the wetting and dispersing agent. Then, 1 / 3 of the aerogel powder is slowly added and dispersed at a low speed of 500 r / min for 5-10 min until the aerogel powder is slightly soluble in water and no longer disperses. Next, the mixture is dispersed at a high speed of 3000 r / min for 15-20 min to obtain a uniformly mixed solution. In the dispersed state, 1 / 3 of the aerogel powder is slowly added, followed by 1 / 3 each of the silane coupling agent and the wetting and dispersing agent. The mixture is then dispersed at a low speed of 500 r / min. Disperse for 5-10 minutes until the aerogel powder is slightly soluble in the solution and no longer disperses. Then, disperse at high speed of 3000 r / min for 15-20 minutes to obtain a uniformly mixed viscous solution. Slowly add the remaining aerogel powder while it is in a dispersed state. Finally, add the remaining silane coupling agent and wetting and dispersing agent and mix well. Disperse at low speed of 500 r / min for 5-10 minutes until the aerogel powder is slightly soluble in the solution and no longer disperses. Then, disperse at high speed of 3000 r / min for 15-20 minutes to obtain a uniformly mixed viscous slurry.

[0045] The raw materials of the aerogel slurry, by weight, include: 70-80 parts water, 1-3 parts silane coupling agent, 1-3 parts wetting and dispersing agent, and 15-25 parts SiO2 aerogel.

[0046] The silane coupling agent is one or more combinations of KH560 and KH550.

[0047] The wetting and dispersing agent is one or more combinations of 104E, X-405 and Tego 755W.

[0048] Based on the above technical solution, the present invention also provides the following embodiments, the formulations (unit: parts by weight) of which are shown in Table 1 below:

[0049] Table 1

[0050]

[0051]

[0052] in:

[0053] In Example 1, the acrylic emulsion used was IC-1002, the hollow glass microspheres had a particle size D50≤60, the film-forming aid was decyl alcohol ester, the defoamer was Tego810, and the thickener was RM-2020.

[0054] The specific preparation method is as follows:

[0055] Step 1: Preparation of Aerogel Slurry

[0056] Weigh the following raw materials by weight: 80 parts by weight of deionized water, 1 part by weight of silane coupling agent, 2 parts by weight of wetting and dispersing agent, and 17 parts by weight of aerogel powder.

[0057] Mix 80 parts by weight of deionized water with 1 / 3 parts by weight of silane coupling agent and 2 / 3 parts by weight of wetting and dispersing agent until homogeneous. Slowly add 17 / 3 parts by weight of aerogel powder and disperse at a low speed of 500 rpm for 5-10 minutes until the aerogel powder is slightly soluble in water and no longer disperses. Then disperse at a high speed of 3000 rpm for 15-20 minutes to obtain a homogeneous solution. In the dispersed state, slowly add 17 / 3 parts by weight of aerogel powder, then add 1 / 3 parts by weight of silane coupling agent and 2 / 3 parts by weight of wetting and dispersing agent and mix until homogeneous. Disperse at a low speed of 500 r / min for 5-10 min until the aerogel powder is slightly soluble in the solution and no longer disperses. Then disperse at a high speed of 3000 r / min for 15-20 min to obtain a uniformly mixed viscous solution. Slowly add the remaining aerogel powder while it is in a dispersed state. Finally, add the remaining silane coupling agent and wetting and dispersing agent and mix well. Disperse at a low speed of 500 r / min for 5-10 min until the aerogel powder is slightly soluble in the solution and no longer disperses. Then disperse at a high speed of 3000 r / min for 15-20 min to obtain a uniformly mixed viscous slurry.

[0058] In this embodiment, the silane coupling agent used is KH560.

[0059] Step 2: Preparation of high-performance aerogel coatings:

[0060] Weigh the following raw materials by weight: 40 parts aerogel slurry, 30 parts acrylic emulsion, 27.2 parts hollow microspheres, 2 parts film-forming aid, 0.3 parts defoamer, and 0.5 parts thickener.

[0061] Acrylic emulsion and film-forming aid are slowly added to the aerogel slurry in sequence and stirred evenly. While stirring, thickener is slowly added and dispersed evenly at high speed. Then, hollow glass microspheres are slowly added while stirring and stirred evenly at low speed. After testing and sieving, the high-performance aerogel coating is obtained.

[0062] Microscopic observation showed that the micropores of the aerogel in Example 1 remained intact, and water and emulsions from the coating did not enter the micropores of the aerogel.

[0063] In Example 2, the acrylic emulsion used was 6016, the hollow glass microspheres had a particle size D50≤60, the film-forming aid was dipropylene glycol butyl ether, the defoamer was Tego901W, and the thickener was 299.

[0064] The specific preparation method is as follows:

[0065] Step 1: Preparation of Aerogel Slurry

[0066] Weigh the following raw materials by weight: 75 parts by weight of deionized water, 2 parts by weight of silane coupling agent, 1 part by weight of wetting and dispersing agent, and 22 parts by weight of aerogel powder.

[0067] Mix 75 parts by weight of deionized water with 2 / 3 parts by weight of silane coupling agent and 1 / 3 parts by weight of wetting and dispersing agent until homogeneous. Slowly add 22 / 3 parts by weight of aerogel powder and disperse at a low speed of 500 rpm for 5-10 minutes until the aerogel powder is slightly soluble in water and no longer disperses. Then disperse at a high speed of 3000 rpm for 15-20 minutes to obtain a homogeneous solution. In the dispersed state, slowly add 22 / 3 parts by weight of aerogel powder, then add 2 / 3 parts by weight of silane coupling agent and 1 / 3 parts by weight of wetting and dispersing agent and mix until homogeneous. Disperse at a low speed of 500 r / min for 5-10 min until the aerogel powder is slightly soluble in the solution and no longer disperses. Then disperse at a high speed of 3000 r / min for 15-20 min to obtain a uniformly mixed viscous solution. Slowly add the remaining aerogel powder while it is in a dispersed state. Finally, add the remaining silane coupling agent and wetting and dispersing agent and mix well. Disperse at a low speed of 500 r / min for 5-10 min until the aerogel powder is slightly soluble in the solution and no longer disperses. Then disperse at a high speed of 3000 r / min for 15-20 min to obtain a uniformly mixed viscous slurry.

[0068] In this embodiment, the silane coupling agent used is KH550.

[0069] Step 2: Preparation of high-performance aerogel coatings:

[0070] Weigh the following raw materials by weight: 48 parts aerogel slurry, 25 parts acrylic emulsion, 24.8 parts hollow microspheres, 1.5 parts film-forming aid, 0.4 parts defoamer, and 0.3 parts thickener.

[0071] Acrylic emulsion and film-forming aid are slowly added to the aerogel slurry in sequence and stirred evenly. While stirring, thickener is slowly added and dispersed evenly at high speed. Then, hollow glass microspheres are slowly added while stirring and stirred evenly at low speed. After testing and sieving, the high-performance aerogel coating is obtained.

[0072] Microscopic observation showed that the micropores of the aerogel in Example 2 remained intact, and water and emulsions in the coating did not enter the micropores of the aerogel.

[0073] In Example 3, the acrylic emulsion used was 6086, the hollow glass microspheres had a particle size D50≤60, the film-forming aid was diethylene glycol butyl ether, the defoamer was BYK-028, and the thickener was 299.

[0074] The specific preparation method is as follows:

[0075] Step 1: Preparation of Aerogel Slurry

[0076] Weigh the following raw materials by weight: 70 parts by weight of deionized water, 3 parts by weight of silane coupling agent, 3 parts by weight of wetting and dispersing agent, and 24 parts by weight of aerogel powder.

[0077] Mix 70 parts by weight of deionized water with 3 / 3 parts by weight of silane coupling agent and 3 / 3 parts by weight of wetting and dispersing agent until homogeneous. Slowly add 24 / 3 parts by weight of aerogel powder and disperse at a low speed of 500 rpm for 5-10 minutes until the aerogel powder is slightly soluble in water and no longer disperses. Then disperse at a high speed of 3000 rpm for 15-20 minutes to obtain a homogeneous solution. In the dispersed state, slowly add 24 / 3 parts by weight of aerogel powder, then add 3 / 3 parts by weight of silane coupling agent and 3 / 3 parts by weight of wetting and dispersing agent and mix until homogeneous. Disperse at a low speed of 500 r / min for 5-10 min until the aerogel powder is slightly soluble in the solution and no longer disperses. Then disperse at a high speed of 3000 r / min for 15-20 min to obtain a uniformly mixed viscous solution. Slowly add the remaining aerogel powder while it is in a dispersed state. Finally, add the remaining silane coupling agent and wetting and dispersing agent and mix well. Disperse at a low speed of 500 r / min for 5-10 min until the aerogel powder is slightly soluble in the solution and no longer disperses. Then disperse at a high speed of 3000 r / min for 15-20 min to obtain a uniformly mixed viscous slurry.

[0078] Step 2: Preparation of high-performance aerogel coatings:

[0079] Weigh the following raw materials by weight: 55 parts aerogel slurry, 20 parts acrylic emulsion, 22.5 parts hollow microspheres, 1 part film-forming aid, 0.5 parts defoamer, and 0.1 parts thickener.

[0080] Acrylic emulsion and film-forming aid are slowly added to the aerogel slurry in sequence and stirred evenly. While stirring, thickener is slowly added and dispersed evenly at high speed. Then, hollow glass microspheres are slowly added while stirring and stirred evenly at low speed. After testing and sieving, the high-performance aerogel coating is obtained.

[0081] Microscopic observation showed that the micropores of the aerogel in Example 3 remained intact, and water and emulsions in the coating did not enter the micropores of the aerogel.

[0082] The present invention also provides the following comparative examples:

[0083] Comparative Example 1

[0084] The same type of commercially available thermal insulation coating is used, specifically aerogel thermal insulation coating.

[0085] Microscopic observation revealed that water and emulsion in the coating of Comparative Example 1 entered the micropores of the aerogel, causing the framework to collapse and lose its nanoporous structure.

[0086] Comparative Example 2

[0087] The only difference between this comparative example and Example 1 is that the added aerogel slurry is not homemade, but a commercially available aerogel slurry. The commercially available aerogel slurry has not been modified in any way, and the other conditions are the same as those in the example.

[0088] Microscopic observation revealed that water and emulsion in the coating of Comparative Example 2 entered the micropores of the aerogel, causing the framework to collapse and lose its nanoporous structure.

[0089] Comparative Example 3

[0090] The only difference between this comparative example and Example 1 is that the acrylic emulsion added is not the acrylic emulsion defined in this invention, but a common commercially available acrylic emulsion, and the number of hollow glass microspheres and SiO2 aerogel slurry (thermal insulation filler) added are only 30 parts and 15 parts, respectively. Other conditions are the same as in the example.

[0091] Microscopic observation revealed that water and emulsion in the coating of Comparative Example 3 entered the micropores of the aerogel, causing the framework to collapse and lose its nanoporous structure.

[0092] The comparative example used equal amounts of thermal insulation fillers (i.e., hollow glass microspheres and aerogel slurry). The coating exhibited high viscosity and non-flow, resulting in difficulties in construction and defects such as cracking and failure to form a film.

[0093] Comparative Example 4

[0094] The only difference between this comparative example and Example 1 is that the hollow glass microspheres added are not D50≤60μm, but hollow glass microspheres or hollow ceramic microspheres with D50≤55μm, and the number of hollow glass microspheres added is 40-50 parts. Other conditions are the same as in the example.

[0095] Microscopic observation revealed that water and emulsion in the coating of Comparative Example 4 entered the micropores of the aerogel, causing the framework to collapse and lose its nanoporous structure.

[0096] In the comparative example, an equal amount of hollow glass microspheres were added, and the coating exhibited defects such as shrinkage, cracking, and failure to form a film.

[0097] The coatings prepared in the examples and comparative examples were subjected to performance tests, and the test results are shown in Table 2:

[0098] Table 2 Performance data for examples and comparative examples

[0099]

[0100]

[0101] Analyzing the above test results, we can see that:

[0102] (1) The comparison results between the examples and Comparative Example 1 show that

[0103] The coating prepared by this invention through specific methods and formulations exhibits excellent thermal insulation properties, acid and alkali resistance, and superior single-coat non-cracking film thickness. It effectively avoids problems such as poor compatibility between aerogel and emulsion, and easy damage to the nanoporous structure during use. Furthermore, its performance indicators are superior to those of the comparative example (commercially available similar coatings in terms of acid and alkali resistance, thermal conductivity, and single-coat non-cracking film thickness). Therefore, this invention is a high-performance aerogel coating suitable for thermal insulation of various storage tanks, buildings, pipelines, and other equipment and facilities.

[0104] (2) The comparison results of the examples and Comparative Example 2 show that the aerogel slurry made by the present invention, through the production process of adding small amounts of aerogel in steps, is superior to commercially available slurries, which have not undergone any modification. The improvement of aerogel powder by the present invention effectively ensures the dispersion, storage stability and thermal insulation performance of aerogel in coatings.

[0105] (3) The comparison results of the examples and comparative example 3 show that the preferred acrylic emulsions of the present invention are IC-1002, 6016, and 6086. Compared with other commercially available acrylic emulsions, they can absorb more heat-insulating fillers, effectively improve the heat insulation properties of the coating, and ensure good mechanical properties and acid and alkali resistance of the coating.

[0106] (4) The comparison results of the examples and Comparative Example 4 show that, compared with the examples, the hollow glass microspheres in the comparative example are not within the scope of this application, and the heat insulation performance of the coating prepared in Comparative Example 4 is worse, and the thickness of the single-layer non-cracking paint film is reduced.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-performance aerogel coating, characterized in that, The components, by weight, include: 40-55 parts aerogel slurry, 20-30 parts acrylic emulsion, 20-30 parts hollow glass microspheres, 1-2 parts film-forming aid, 0.3-0.5 parts defoamer, and 0.1-0.5 parts thickener. The hollow glass microspheres have a particle size D50 of 60 micrometers. The aerogel slurry is prepared by the following steps: S100. Mix water with a portion of silane coupling agent and wetting and dispersing agent evenly, slowly add a portion of SiO2 aerogel powder, disperse at a low speed of 500r / min for 5-10min, until the aerogel powder is slightly soluble in water and no longer disperses. Disperse at 3000 rpm for 15-20 minutes using S200 to obtain a uniformly mixed solution. Slowly add a portion of aerogel powder, then add a portion of silane coupling agent and wetting and dispersing agent and mix well. Disperse at 500 rpm for 5-10 minutes until the aerogel powder is slightly soluble in the solution and no longer disperses. Then disperse at 3000 rpm for 15-20 minutes to obtain a uniformly mixed viscous solution. S300: Slowly add the remaining aerogel powder to the viscous solution while it is in a dispersed state, then add the remaining silane coupling agent and wetting and dispersing agent and mix evenly. Disperse at a low speed of 500 r / min for 5-10 min until the aerogel powder is slightly soluble in the solution and no longer disperses. Then disperse at a high speed of 3000 r / min for 15-20 min to obtain a uniformly mixed aerogel slurry. In S100, S200 and S300, the mass ratio of added SiO2 aerogel powder is 1:1:1, the mass ratio of added silane coupling agent is 1:1:1, and the mass ratio of added wetting and dispersing agent is 1:1:

1. According to the weight percentages, the raw materials of the aerogel slurry include: 70-80 parts water, 1-3 parts silane coupling agent, 1-3 parts wetting and dispersing agent, and 15-25 parts SiO2 aerogel. The silane coupling agent is one or both of KH560 and KH550, and the wetting and dispersing agent is one or a combination of 104E, X-405 and Tego 755W; The acrylic emulsion is one or more of IC-1002, 6016, and 6086.

2. The high performance aerogel coating of claim 1, wherein: The film-forming aid is one or more of the following: dodecyl alcohol ester, dipropylene glycol butyl ether, and diethylene glycol butyl ether; the defoamer is one or more of the following: Tego810, Tego901W, and BYK-028; and the thickener is one or more of the following: RM-2020, PU1191, and 299.

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