Aerogel thermal insulation coating material, and preparation method and application thereof

Abstract

The present application relates to aerogel thermal insulation coating technical field, specifically to a kind of aerogel thermal insulation coating and its preparation method and application.The preparation raw material of the coating includes:100 weight parts of silicone resin emulsion, 60-100 weight parts of thermal insulation filler dispersion liquid, 1-10 weight parts of dispersing agent and 1-10 weight parts of thickening agent;Wherein, the thermal insulation filler dispersion liquid contains 50-95wt% of graphene oxide silicon carbide nanowire composite aerogel.The aerogel thermal insulation coating provided in the present application has the advantages of low thermal conductivity, good thermal insulation performance, excellent mechanical properties, not easy to fall off, convenient transportation and storage, and environmental friendly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aerogel thermal insulation coating, in particular to an aerogel thermal insulation coating and a preparation method and application thereof. BACKGROUND

[0002] Aerogel is a kind of solid material with nano-porous network structure and filled with gaseous dispersion medium in the pores, which is the lightest solid in the world. The aerogel thermal insulation coating prepared by using aerogel is an innovative thermal insulation material, which combines the closed micro-porous structure and the network fiber structure of aerogel, has low thermal conductivity, excellent thermal insulation performance, and wide applicable temperature range. In addition, it also has the performances of light weight, cold insulation, shock absorption and sound absorption, and is widely used in metallurgy, chemical industry, petroleum, shipbuilding, textile, medicine, transportation, thermal power and construction industries. Moreover, the aerogel thermal insulation coating is convenient to construct, does not pollute the environment, does not irritate the skin, and has no waste during construction.

[0003] However, the aerogel thermal insulation coating also has its own limitations, which generally has the following defects: 1) the thermal conductivity of the coating is still large and needs to be further reduced; 2) the adhesion of the coating on the substrate is poor and easy to fall off; 3) the mechanical properties of the coating are poor and the service life is short.

[0004] Therefore, it is urgent to provide an aerogel thermal insulation coating with small thermal conductivity, good mechanical properties, long service life and not easy to fall off. SUMMARY

[0005] The purpose of the present application is to solve the problems of large thermal conductivity, poor mechanical properties and easy to fall off in the aerogel thermal insulation coating, and to provide an aerogel thermal insulation coating and a preparation method and application thereof.

[0006] In order to achieve the above purpose, the first aspect of the present application provides an aerogel thermal insulation coating, wherein the preparation raw materials of the coating include: 100 parts by weight of organic silicone resin emulsion, 60-100 parts by weight of thermal insulation filler dispersion liquid, 1-10 parts by weight of dispersant and 1-10 parts by weight of thickening agent; wherein the thermal insulation filler dispersion liquid contains 50-95wt% of graphene oxide silicon carbide nanowire composite aerogel.

[0007] The second aspect of the present application provides a preparation method of an aerogel thermal insulation coating, wherein the method comprises the following steps:

[0008] (1) dispersing graphene oxide silicon carbide nanowire composite aerogel in water to obtain a thermal insulation filler dispersion liquid;

[0009] (2) mixing the thermal insulation filler dispersion liquid and the organic silicone resin emulsion to obtain a mixed emulsion;

[0010] (3) Add dispersant and thickener to the mixed emulsion to obtain aerogel thermal insulation coating;

[0011] The mass ratio of the organosilicon resin emulsion, the heat-insulating filler dispersion, the dispersant, and the thickener is 100:60-100:1-10:1-10.

[0012] The third aspect of the present invention provides an application of the aerogel thermal insulation coating described in the first aspect of the present invention, or the aerogel thermal insulation coating prepared by the method described in the second aspect of the present invention, in the fields of aerospace and oil well drilling.

[0013] The beneficial technical effects of the present invention through the above technical solution are as follows:

[0014] 1) The aerogel thermal insulation coating provided in this invention has the advantages of low thermal conductivity, good thermal insulation performance, excellent mechanical properties, not easy to fall off, easy to transport and store, and environmentally friendly. It can withstand high temperatures above 300°C.

[0015] 2) The preparation method of the aerogel thermal insulation coating provided in this invention is simple and suitable for industrial application. Detailed Implementation

[0016] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0017] The first aspect of the present invention provides an aerogel thermal insulation coating, wherein the raw materials for preparing the coating include: 100 parts by weight of an organosilicon resin emulsion, 60-100 parts by weight of a thermal insulation filler dispersion, 1-10 parts by weight of a dispersant and 1-10 parts by weight of a thickener; wherein the thermal insulation filler dispersion contains 50-95 wt% of graphene oxide silicon carbide nanowire composite aerogel.

[0018] In a preferred embodiment of the present invention, the raw materials for preparing the coating include: 100 parts by weight of organosilicon resin emulsion, 70-90 parts by weight of heat-insulating filler dispersion, 2-8 parts by weight of dispersant and 2-8 parts by weight of thickener; wherein the heat-insulating filler dispersion contains 70-90 wt% of graphene oxide silicon carbide nanowire composite aerogel.

[0019] In a further preferred embodiment of the present invention, the raw materials for preparing the coating include: 100 parts by weight of organosilicon resin emulsion, 75-85 parts by weight of heat-insulating filler dispersion, 4-6 parts by weight of dispersant and 4-6 parts by weight of thickener; wherein the heat-insulating filler dispersion contains 75-85 wt% of graphene oxide silicon carbide nanowire composite aerogel.

[0020] In a preferred embodiment of the present invention, the solid content of the organosilicon resin emulsion is 50-90 wt%, preferably 70-80 wt%.

[0021] In this invention, the silicone resin emulsion can be a commercially available product or prepared according to a known method. The solid content of the silicone resin emulsion can be adjusted by changing the amount of solvent used in the silicone resin emulsion.

[0022] In a preferred embodiment of the present invention, the silicone resin emulsion is selected from silicone resin emulsions containing phenyl and / or epoxy groups.

[0023] In this invention, the inventors discovered through research that organosilicon resin emulsions containing phenyl and / or epoxy groups not only have good temperature resistance, capable of withstanding temperatures above 300°C, but also have enriched electron clouds, which can enhance the interaction between the coating and the substrate, increase the adhesion of the coating, and prevent the coating from peeling off.

[0024] In a preferred embodiment of the present invention, the organosilicon resin emulsion is selected from one or more of epoxy-modified organosilicon resin emulsion, methylphenyl silicone resin emulsion, and methylphenyl-modified silicone resin emulsion, preferably methylphenyl-modified silicone resin emulsion.

[0025] In this invention, there are no special limitations on epoxy-modified silicone resin emulsions, methylphenyl silicone resin emulsions, and methylphenyl-modified silicone resin emulsions; all commercially available products in the art can be used in this invention.

[0026] In a preferred embodiment of the present invention, the solvent in the thermal insulation filler dispersion is water. In this invention, dispersing the thermal insulation filler in water improves the dispersibility between the thermal insulation filler and the silicone resin emulsion, which helps to further improve the uniformity of the coating and thus improve the mechanical properties of the coating.

[0027] In a preferred embodiment of the present invention, the mass ratio of graphene oxide to silicon carbide nanowires in the graphene oxide-silicon carbide nanowire composite aerogel is 1:1-4, preferably 1:1.5-2.5.

[0028] In this invention, the graphene oxide-silicon carbide nanowire composite aerogel can significantly reduce the thermal conductivity of the coating, thereby improving its thermal insulation performance. Under the action of dispersants and thickeners, the graphene oxide-silicon carbide nanowire composite aerogel interacts with the silicone resin emulsion, further enhancing the mechanical properties of the coating and thus helping to extend its service life.

[0029] In a preferred embodiment of the present invention, the preparation method of the graphene oxide and silicon carbide nanowire composite aerogel includes the following steps:

[0030] (S1) Graphene oxide is dispersed in deionized water to prepare an aqueous solution of graphene oxide;

[0031] (S2) Add NaOH-treated silicon carbide nanowires to the graphene oxide aqueous solution from step (S1) and stir thoroughly to obtain a mixed solution of graphene oxide and silicon carbide nanowires.

[0032] (S3) Add citric acid to the graphene oxide and silicon carbide nanowire mixed solution in step (S2) and stir thoroughly to obtain the graphene oxide and silicon carbide nanowire mixed reaction solution.

[0033] (S4) The graphene oxide and silicon carbide nanowire mixed reaction solution in step (S3) is subjected to hydrothermal reaction to obtain GO / SiC nanowire hydrogel.

[0034] (S5) Freeze-dry the GO / SiC nanowire hydrogel from step (S4) to obtain GO / SiC nanowire aerogel, which is also known as graphene oxide silicon carbide nanowire composite aerogel.

[0035] Further, the concentration of the graphene oxide aqueous solution in step (S1) is 0.5-3.5 mg / mL, preferably 1.5-2.5 mg / mL, and more preferably 2 mg / mL.

[0036] Furthermore, the process of treating silicon carbide nanowires with NaOH includes: placing the silicon carbide nanowires in a NaOH solution, soaking them at room temperature for 2-4 hours, and then washing and drying them.

[0037] Furthermore, the concentration of the NaOH solution is 1-3 mol / L, preferably 1.5-2.5 mol / L, and even more preferably 2 mol / L.

[0038] Furthermore, the stirring time in step (S2) is 2-4 hours.

[0039] Further, in step (S2), the mass ratio of graphene oxide to NaOH-treated silicon carbide nanowires in the graphene oxide aqueous solution is 1:1-3, preferably 1:1.5-2.5, and more preferably 1:2.

[0040] Further, in step (S3), the molar ratio of citric acid to NaOH-treated silicon carbide nanowires is 1:0.5-2.5, preferably 1:0.8-1.5, and more preferably 1:1.

[0041] Furthermore, the hydrothermal reaction conditions in step (S4) are 100-140°C, preferably 110-130°C, and even more preferably 120°C.

[0042] Furthermore, the hydrothermal reaction time in step (S4) is 3-15 hours, preferably 9-12 hours.

[0043] Further, the freezing temperature in step (S5) is -60°C to -20°C, preferably -50°C to -35°C, and more preferably -42°C.

[0044] Furthermore, the freeze-drying time in step (S5) is 6-48 hours, preferably 18-36 hours, and more preferably 24 hours.

[0045] In a preferred embodiment of the present invention, the dispersant is selected from one or more of BYK-163 dispersant, BYK-9076 dispersant, and BYK-AT204 dispersant, preferably BYK-9076 dispersant.

[0046] In a preferred embodiment of the present invention, the thickener is selected from magnesium aluminum silicate suspension thixotropic thickener and / or alkali-swelling thickener, preferably magnesium aluminum silicate suspension thixotropic thickener.

[0047] In this invention, the magnesium aluminum silicate thickener can be commercially available magnesium aluminum silicate PT-XZ18 suspension thixotropic thickener or commercially available magnesium aluminum silicate PT-XL58F suspension thixotropic thickener, and the alkali-swelling thickener can be commercially available ASE-60 alkali-swelling thickener.

[0048] The aerogel thermal insulation coating provided in this invention may also contain lubricants, antibacterial agents, antioxidants, color fillers, and other modified additives known in the art, depending on actual needs.

[0049] A second aspect of the present invention provides a method for preparing an aerogel thermal insulation coating, wherein the method includes the following steps:

[0050] (1) The graphene oxide silicon carbide nanowire composite aerogel was dispersed in water to obtain a thermal insulation filler dispersion.

[0051] (2) The heat-insulating filler dispersion and the organosilicon resin emulsion are mixed to obtain a mixed emulsion;

[0052] (3) Add dispersant and thickener to the mixed emulsion to obtain aerogel thermal insulation coating;

[0053] The mass ratio of the organosilicon resin emulsion, the heat-insulating filler dispersion, the dispersant, and the thickener is 100:60-100:1-10:1-10.

[0054] In step (1):

[0055] In a preferred embodiment of the present invention, the mass ratio of graphene oxide to silicon carbide nanowires in the graphene oxide-silicon carbide nanowire composite aerogel is 1:1-4, preferably 1:1.5-2.5.

[0056] In a preferred embodiment of the present invention, the preparation method of the graphene oxide and silicon carbide nanowire composite aerogel is the same as the preparation method of the graphene oxide and silicon carbide nanowire composite aerogel described in the first aspect of the present invention.

[0057] In a preferred embodiment of the present invention, the dispersion in step (1) is carried out at room temperature and stirred at a speed of 1500-3500 rpm / min for 2-5 hours.

[0058] In a preferred embodiment of the present invention, the content of graphene oxide silicon carbide nanowire composite aerogel in the thermal insulation filler dispersion is 50-95 wt%, preferably 70-90 wt%, and more preferably 75-85 wt%.

[0059] In step (2):

[0060] In a preferred embodiment of the present invention, the solid content of the organosilicon resin emulsion is 50-90 wt%, preferably 70-80 wt%.

[0061] In a preferred embodiment of the present invention, the organosilicon resin emulsion is selected from one or more of epoxy-modified organosilicon resin emulsion, methylphenyl silicone resin emulsion, and methylphenyl-modified silicone resin emulsion, preferably methylphenyl-modified silicone resin emulsion.

[0062] In step (3):

[0063] In a preferred embodiment of the present invention, the dispersant is selected from one or more of BYK-163 dispersant, BYK-9076 dispersant, and BYK-AT204 dispersant, preferably BYK-9076 dispersant.

[0064] In a preferred embodiment of the present invention, the thickener is selected from magnesium aluminum silicate suspension thixotropic thickener and / or alkali-swelling thickener, preferably magnesium aluminum silicate suspension thixotropic thickener.

[0065] In a preferred embodiment of the present invention, the mass ratio of the organosilicon resin emulsion, the heat-insulating filler dispersion, the dispersant and the thickener is 100:70-90:2-8:2-8, preferably 100:75-85:4-6:4-6.

[0066] The third aspect of the present invention provides an application of the aerogel thermal insulation coating described in the first aspect of the present invention or the aerogel thermal insulation coating prepared by the preparation method described in the second aspect of the present invention in the fields of aerospace and oil well.

[0067] The present invention will be described in detail below through embodiments.

[0068] The methylphenyl modified silicone resin emulsion was purchased from Silicone Oil House, brand name 9604A, with a solid content of 75 wt%; the epoxy modified silicone resin emulsion was purchased from Jiangyin Zhongxin Silicon Materials Co., Ltd., brand name SH-023, with a solid content of 70 wt%; and the methylphenyl silicone resin emulsion was purchased from Jiangyin Zhongxin Silicon Materials Co., Ltd., brand name SH-96, with a solid content of 80 wt%. The dispersant was BYK-9076, purchased from BYK, brand name BYK-9076; and the thickener was magnesium aluminum silicate, purchased from Shuohui Industrial Products, brand name PT-XZ18.

[0069] Preparation of graphene oxide and silicon carbide nanowire composite aerogel:

[0070] (S1) Disperse 40 mg of graphene oxide in deionized water to prepare an aqueous solution of graphene oxide with a concentration of 2 mg / mL;

[0071] (S2) Place silicon carbide nanowires in a 2 mol / L NaOH solution and soak for 2 h at room temperature. Then wash and dry to obtain NaOH-treated silicon carbide nanowires. Add 80 mg of NaOH-treated silicon carbide nanowires to the graphene oxide aqueous solution in step (S1) and stir thoroughly for 2 h to obtain a mixed solution of graphene oxide and silicon carbide nanowires.

[0072] (S3) Add citric acid to the graphene oxide and silicon carbide nanowire mixed solution in step (S2), with a molar ratio of silicon carbide nanowires to citric acid of 1:1. Stir thoroughly to obtain a graphene oxide and silicon carbide nanowire mixed reaction solution.

[0073] (S4) The graphene oxide and silicon carbide nanowire mixed reaction solution in step (S3) is subjected to hydrothermal reaction at 120℃ for 15h to obtain GO / SiC nanowire hydrogel.

[0074] (S5) The GO / SiC nanowire hydrogel from step (S4) was freeze-dried at -42℃ for 24h to obtain graphene oxide silicon carbide nanowire composite aerogel.

[0075] Example 1

[0076] (1) The graphene oxide silicon carbide nanowire composite aerogel was dispersed in water and stirred at 2500 rpm / min for 3 h to obtain a thermal insulation filler dispersion with a graphene oxide silicon carbide nanowire composite aerogel content of 80 wt%.

[0077] (2) Mix 80g of the above heat-insulating filler dispersion and 100g of methylphenyl modified organosilicon resin emulsion at room temperature to obtain a mixed emulsion;

[0078] (3) Add 5g of dispersant and 5g of thickener to the above mixed emulsion and mix evenly to obtain aerogel thermal insulation coating.

[0079] Example 2

[0080] (1) The graphene oxide silicon carbide nanowire composite aerogel was dispersed in water and stirred at 2500 rpm / min for 3 h to obtain a thermal insulation filler dispersion with a graphene oxide silicon carbide nanowire composite aerogel content of 75 wt%.

[0081] (2) Mix 85g of the above heat-insulating filler dispersion and 100g of methylphenyl modified organosilicon resin emulsion at room temperature to obtain a mixed emulsion;

[0082] (3) Add 4g of dispersant and 6g of thickener to the above mixed emulsion and mix evenly to obtain aerogel thermal insulation coating.

[0083] Example 3

[0084] (1) The graphene oxide silicon carbide nanowire composite aerogel was dispersed in water and stirred at 2500 rpm / min for 3 h to obtain a thermal insulation filler dispersion with a graphene oxide silicon carbide nanowire composite aerogel content of 85 wt%.

[0085] (2) 75g of the above heat-insulating filler dispersion and 100g of methylphenyl modified organosilicon resin emulsion were mixed at room temperature to obtain a mixed emulsion;

[0086] (3) Add 6g of dispersant and 4g of thickener to the above mixed emulsion and mix evenly to obtain aerogel thermal insulation coating.

[0087] Example 4

[0088] (1) The graphene oxide silicon carbide nanowire composite aerogel was dispersed in water and stirred at 2500 rpm / min for 3 h to obtain a thermal insulation filler dispersion with a graphene oxide silicon carbide nanowire composite aerogel content of 70 wt%.

[0089] (2) Mix 70g of the above heat-insulating filler dispersion and 100g of epoxy-modified silicone resin emulsion at room temperature to obtain a mixed emulsion;

[0090] (3) Add 2g of dispersant and 2g of thickener to the above mixed emulsion and mix evenly to obtain aerogel thermal insulation coating.

[0091] Example 5

[0092] (1) The graphene oxide silicon carbide nanowire composite aerogel was dispersed in water and stirred at 2500 rpm / min for 3 h to obtain a thermal insulation filler dispersion with a graphene oxide silicon carbide nanowire composite aerogel content of 90 wt%.

[0093] (2) Mix 90g of the above heat-insulating filler dispersion and 100g of methylphenyl silicone resin emulsion at room temperature to obtain a mixed emulsion;

[0094] (3) Add 8g of dispersant and 8g of thickener to the above mixed emulsion and mix evenly to obtain aerogel thermal insulation coating.

[0095] Comparative Example 1

[0096] Same as Example 1, except that the thermal insulation filler dispersion is omitted.

[0097] Comparative Example 2

[0098] Similar to Example 1, except that the graphene oxide silicon carbide nanowire composite aerogel was replaced with an equal amount of SiO2 aerogel.

[0099] Comparative Example 3

[0100] Similar to Example 1, except that the amount of thermal insulation filler dispersion added is 40g.

[0101] Test Example 1

[0102] The properties of the coatings prepared in Examples 1-5 and Comparative Examples 1-3 were tested, and the results are shown in Table 1. Thermal conductivity was tested using the transient planar heat source method (TPS) according to GB / T 32064-2015. Adhesion was tested using the pull-off adhesion test for paints and varnishes according to GB / T 5210-2006. Pencil hardness was tested using the pencil test method for coating film hardness according to GB / T 6739-2006. Tensile strength of the coating film was tested using an electronic universal testing machine according to the standard test method of GB / T1040.3-2006.

[0103] Table 1

[0104]

[0105] As shown in Table 1, the aerogel thermal insulation coating prepared in this invention has a thermal conductivity below 0.2 W / m·K, exhibiting excellent thermal insulation performance. The adhesion of the aerogel thermal insulation coating is between 20-25 MPa, indicating a strong bond between the coating and the substrate, preventing it from easily peeling off. The aerogel thermal insulation coating has high pencil hardness and high tensile strength, indicating good mechanical properties, scratch resistance, and wear resistance, allowing for long-term use.

[0106] Comparative Examples 1 and 2 show that, compared with SiO2 aerogel, graphene oxide-silicon carbide nanowire composite aerogel can significantly improve the adhesion of the coating to the substrate, as well as the hardness and tensile strength of the coating. Comparative Examples 1, 2, and 3 show that without the addition of a thermal insulation filler dispersion, or with an insufficient amount of thermal insulation filler dispersion, the coating's thermal insulation effect, adhesion, and mechanical property modification effect are all poor.

[0107] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. An aerogel thermal insulation coating, characterized in that, The raw materials for preparing the coating include: 100 parts by weight of silicone resin emulsion, 60-100 parts by weight of heat-insulating filler dispersion, 1-10 parts by weight of dispersant and 1-10 parts by weight of thickener; wherein the heat-insulating filler dispersion contains 50-95 wt% of graphene oxide silicon carbide nanowire composite aerogel. The preparation method of the graphene oxide and silicon carbide nanowire composite aerogel includes the following steps: (S1) Graphene oxide is dispersed in deionized water to prepare an aqueous solution of graphene oxide; (S2) Add NaOH-treated silicon carbide nanowires to the graphene oxide aqueous solution from step (S1) and stir thoroughly to obtain a mixed solution of graphene oxide and silicon carbide nanowires. (S3) Add citric acid to the graphene oxide and silicon carbide nanowire mixed solution in step (S2) and stir thoroughly to obtain the graphene oxide and silicon carbide nanowire mixed reaction solution. (S4) The graphene oxide and silicon carbide nanowire mixed reaction solution from step (S3) is subjected to hydrothermal reaction to obtain GO / SiC nanowire hydrogel. (S5) Freeze-dry the GO / SiC nanowire hydrogel from step (S4) to obtain the graphene oxide silicon carbide nanowire composite aerogel.

2. The coating according to claim 1, wherein, The raw materials for preparing the coating include: 100 parts by weight of silicone resin emulsion, 70-90 parts by weight of heat-insulating filler dispersion, 2-8 parts by weight of dispersant and 2-8 parts by weight of thickener; wherein the heat-insulating filler dispersion contains 70-90 wt% graphene oxide silicon carbide nanowire composite aerogel.

3. The coating according to claim 2, wherein, The raw materials for preparing the coating include: 100 parts by weight of silicone resin emulsion, 75-85 parts by weight of heat-insulating filler dispersion, 4-6 parts by weight of dispersant and 4-6 parts by weight of thickener; wherein the heat-insulating filler dispersion contains 75-85 wt% of graphene oxide silicon carbide nanowire composite aerogel.

4. The coating according to claim 1, wherein, The solid content of the silicone resin emulsion is 50-90 wt%. And / or, the silicone resin emulsion is selected from silicone resin emulsions containing phenyl and / or epoxy groups.

5. The coating according to claim 4, wherein, The silicone resin emulsion is selected from one or more of epoxy-modified silicone resin emulsion, methylphenyl silicone resin emulsion, and methylphenyl-modified silicone resin emulsion.

6. The coating according to claim 1, wherein, The mass ratio of graphene oxide to silicon carbide nanowires in the graphene oxide-silicon carbide nanowire composite aerogel is 1:1-4.

7. The coating according to claim 1, wherein, The dispersant is selected from one or more of BYK-163 dispersant, BYK-9076 dispersant, and BYK-AT204 dispersant; And / or, the thickener is selected from magnesium aluminum silicate suspension thixotropic thickener and / or alkali-swelling thickener.

8. A method for preparing an aerogel thermal insulation coating, characterized in that, The method includes the following steps: (1) The graphene oxide silicon carbide nanowire composite aerogel was dispersed in water to obtain a thermal insulation filler dispersion; (2) The heat-insulating filler dispersion and the organosilicon resin emulsion are mixed to obtain a mixed emulsion; (3) Add the dispersant and thickener to the mixed emulsion to obtain an aerogel thermal insulation coating; The mass ratio of the organosilicon resin emulsion, the heat-insulating filler dispersion, the dispersant, and the thickener is 100:60-100:1-10:1-10.

9. The preparation method according to claim 8, wherein, The mass ratio of the organosilicon resin emulsion, the heat-insulating filler dispersion, the dispersant, and the thickener is 100:70-90:2-8:2-8.

10. The preparation method according to claim 9, wherein, The mass ratio of the organosilicon resin emulsion, the heat-insulating filler dispersion, the dispersant, and the thickener is 100:75-85:4-6:4-6.

11. The application of the aerogel thermal insulation coating according to any one of claims 1-7 or the aerogel thermal insulation coating prepared by the method according to any one of claims 8-10 in the fields of aerospace and oil well.

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