A self-cleaning heat-insulating coated glass and its preparation method

Abstract

This invention discloses a method for preparing self-cleaning heat-insulating coated glass. The method is characterized by the following steps: 10-50% by weight of an organosilicon oligomer with a degree of polymerization not exceeding 200, 10-30% by weight of oxide semiconductor nanoparticles with heat-insulating function, 1-15% by weight of nano-titanium dioxide with infrared emission and photocatalytic function, 0.1-5% by weight of a titanium-coupled crosslinking agent with coating function, 0.01%-0.1% by weight of an acetylenic glycol defoamer, and 10-25% by weight of solvent are mixed sequentially and dispersed evenly to obtain a self-cleaning heat-insulating coating. The self-cleaning heat-insulating coating is then applied to the surface of a regular glass substrate by roller coating or spraying and cured at 160-280 degrees Celsius for 3-5 minutes. After curing, it is tempered for 5-15 minutes, and after cooling, a self-cleaning heat-insulating coated glass is obtained. This invention not only possesses properties such as resistance to ultraviolet aging, scratch resistance, and abrasion resistance, but also has the advantage of a photocatalytic self-cleaning effect.

Description

Technical Field

[0001] This invention relates to the field of self-cleaning heat-insulating coated glass technology, specifically to a self-cleaning heat-insulating coated glass and its preparation method. Background Technology

[0002] Currently, most commercial buildings, especially high-rise buildings, use double-glazed Low-E glass or high-insulation float glass. Although the heat insulation performance of high-insulation float glass differs from Low-E glass, its surface characteristics are the same as Low-E glass, whether used as a single pane or as insulated glass; both are ordinary float glass materials. While these heat-insulating and energy-saving glasses offer good insulation, over long-term use, various air pollutants inevitably accumulate and deposit on their surface. For example, dust and atmospheric organic pollutants, as they accumulate, form stubborn stains on the glass surface, reducing light transmittance and affecting the building's appearance. Currently, high-rise buildings mostly address these issues through regular manual cleaning at height. However, long-term high-altitude cleaning of high-rise buildings continuously increases maintenance costs and poses unnecessary risks to cleaning workers and their families.

[0003] Therefore, in order to solve the above problems, this paper proposes a self-cleaning heat-insulating coated glass and its preparation method. Summary of the Invention

[0004] The purpose of this invention is to provide a self-cleaning heat-insulating coated glass, which can solve the problems of high maintenance costs and high risk associated with energy-saving heat-insulating glass used in high-rise buildings, which requires regular manual cleaning during use.

[0005] To achieve the above-mentioned technical effects, the present invention is implemented through the following technical solution: a self-cleaning heat-insulating coated glass, comprising ordinary glass and a self-cleaning heat-insulating coating slurry, characterized in that: the heat-insulating self-cleaning coating slurry is applied to ordinary glass by roller coating or spraying, and then sintered and cured on the glass surface using a glass tempering process; the self-cleaning heat-insulating coating slurry, by weight percentage, contains the following components: 10-50% organosilicon oligomers with a degree of polymerization not exceeding 200, 10-30% oxide semiconductor nanoparticles with heat-insulating function, 1-15% nano-titanium dioxide with infrared emission and photocatalytic function, 0.1-5% titanium couple crosslinking agent with coating function, 0.01%-0.1% acetylenic glycol defoamer, and 10-25% solvent.

[0006] Another object of the present invention is to provide a self-cleaning heat-insulating coated glass and a method for preparing the same, comprising the following steps:

[0007] S1. Raw material preparation: Prepare 10-50% by weight of organosilicon oligomers with a degree of polymerization not exceeding 200, 10-30% of oxide semiconductor nanoparticles with heat insulation function, 1-15% of nano-titanium dioxide with photocatalytic function, 0.1-5% of titanium couple crosslinking agent with coating function, 0.01%-0.1% of acetylenic glycol defoamer, and 10-25% solvent for later use; prepare ordinary glass sheets for later use.

[0008] S2. Add the heat-insulating nanoparticles to the solvent, then add the titanium coupling agent and stir evenly; then add the solvent, organosilicon oligomer and acetylenic diol defoamer in sequence, disperse and stir evenly to obtain a self-cleaning heat-insulating coating film.

[0009] S3. Clean and remove static electricity from the ordinary glass sheet;

[0010] S4. Apply the above self-cleaning heat insulation coating to the surface of ordinary glass sheet by roller coating or spraying, and heat at 160-280 degrees Celsius for 3-5 minutes to cure;

[0011] S5. After curing, push it into the tempering furnace for tempering for 5 to 15 minutes. After cooling, a self-cleaning heat-insulating coated glass with both durability and high strength can be obtained.

[0012] Furthermore, in S2, the method for preparing the self-cleaning heat-insulating coating is as follows:

[0013] S2.1. Heat-insulating nanoparticles are added to a solvent in the form of a dispersion slurry to prepare a dispersion liquid;

[0014] S2.2 Add the chelate to the dispersion and stir for 10-200 minutes to obtain the heat-insulating nano-slurry;

[0015] S2.3. Add solvent, organosilicon oligomer and acetylation diol defoamer to the slurry in sequence, and stir for 20 to 60 minutes to make it evenly mixed, so as to obtain a self-cleaning heat insulation coating film.

[0016] Furthermore, in S1, the organosilicon oligomer is any one or more of methyl orthosilicate oligomer, ethyl orthosilicate oligomer, amino organosilicon oligomer, epoxy organosilicon oligomer, and γ-mercaptopropyltrimethoxysilane oligomer; the degree of polymerization of the organosilicon oligomer is preferably 5 to 100.

[0017] Furthermore, in S1, the oxide semiconductor nanoparticles are any one or more of nano-tin antimony oxide, nano-indium tin oxide, or cesium tungsten, or aluminum-doped zinc oxide.

[0018] Furthermore, in S1, the oxide semiconductor nanoparticles are solvent-based or aqueous dispersions with an average particle size of no more than 50 nanometers.

[0019] Furthermore, in S1, the nano-titanium dioxide is a solvent-based or aqueous dispersion slurry of anatase or rutile type with an average particle size of no more than 20 nanometers, either alone or in combination with both.

[0020] Furthermore, in S1, the organic solvent is one or more of methanol, ethanol, isopropanol, ethylene glycol, ethylene glycol monomethyl ether, ethylene glycol ethyl ether, ethylene glycol butyl ether, and ethyl acetate.

[0021] Furthermore, the titanium couple crosslinking agent is selected from reactive organic titanate chelates with chelating function, especially products with the same structure as DuPont Tyzor AA75 titanium resin.

[0022] Furthermore, in S4, the thickness of the self-cleaning heat-insulating coating is controlled between 300 and 2000 nanometers.

[0023] The beneficial effects of this invention are:

[0024] 1. In this technical solution, a thin layer of titanium dioxide is formed on the nano-semiconductor particles after sintering by coating with titanium resin chelating agents such as DuPont Tyzor AA75, which protects and ensures the thermal insulation performance of the infrared reflective nanoparticles.

[0025] 2. In this technical solution, by coating with titanium resin chelating agents such as DuPont Tyzor AA75, the thin layer of titanium dioxide formed on the nano-semiconductor particles after film sintering forms a highly interfacial composite heterojunction particle with the nano-semiconductor, which improves their photogenerated carrier separation efficiency and the transfer of the generated photogenerated charge to the surface silicon dioxide, greatly improving the self-cleaning effect of the heat insulation glass surface.

[0026] 3. The self-cleaning heat insulation coating layer uses oligomeric silicone resin as a film-forming agent and coating titanium resin such as DuPont Tyzor AA75 as a crosslinking agent and coating agent. After tempering on the glass surface, it forms a high-hardness pure inorganic film that is scratch-resistant, can be used on one side or both sides, and will not oxidize or age. The glass is transparent and heat-insulating while also having a hydrophilic self-cleaning function. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a flowchart of the method for preparing self-cleaning heat-insulating coated glass according to the present invention;

[0029] Figure 2 This is a flowchart of the self-cleaning heat-insulating coating preparation method of the present invention; Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1

[0032] This embodiment describes the self-cleaning and heat-insulating principle of self-cleaning heat-insulating coated glass: In this technical solution, an organic titanate chelate is selected as a crosslinking agent; this type of organic titanate chelate has functional coupling groups, is stable at room temperature, and can effectively coat the surface of nano-inorganic particles in the slurry, playing a role in dispersing and coupling the original nano-semiconductor particles; this organic-inorganic titanium chelating agent is transformed into titanium dioxide during high-temperature sintering, forming a highly uniform semiconductor heterojunction on the surface of infrared heat-insulating nanoparticles, which on the one hand protects the infrared reflective nanoparticles from melting at high temperatures, and on the other hand improves the dispersibility of the nano-heat-insulating semiconductor in the coating, thereby improving the heat insulation effect of the coating;

[0033] Secondly, this titanium coupling agent-coated nano-semiconductor slurry, when mixed with silicone resin, exhibits room-temperature chelation with the resin's hydroxyl groups, resulting in excellent leveling and stability. This avoids the drawbacks of low viscosity, low solid content, and instability associated with tetraethyl orthosilicate hydrolysis products. When the slurry is applied to the glass surface via roller coating or spraying, and then cured by baking followed by high-temperature sintering during glass tempering, the silicone resin transforms into a silicon dioxide film during sintering. The dispersed nano-semiconductor particles are embedded within the resulting silicon dioxide, forming a coating that prevents agglomeration of infrared-reflecting particles, thus providing excellent thermal insulation performance. Simultaneously, the chelating titanium coupling agent forms chemical bonds with the silicone resin. After high-temperature sintering and curing, the chemical bond between the semiconductor particles and the silicon dioxide interface is further strengthened, ensuring the charge transport layer of photogenerated holes formed by the nanoparticles. This enhances the transfer of photogenerated charges from the thermal insulation semiconductor particles and nano-titanium dioxide to the silicon dioxide layer, ensuring a self-cleaning effect on the glass surface. The coating adheres firmly to the glass surface, preventing easy detachment, and provides both self-cleaning and thermal insulation functions.

[0034] Example 2

[0035] This embodiment uses 40% by weight of nano-tin antimony oxide (particle size ≤ 50 nm) ethanol dispersion with a solid content of 25%, 15% nano-titanium dioxide with an average particle size of 15 nm, 10% orthosilicate oligomer with a degree of polymerization of 5, 0.1% Tyzor AA75 crosslinking agent, 0.01% acetylsene glycol defoamer, and 34.9% ethanol as raw materials. After being dispersed evenly, it is used as a slurry for heat-insulating self-cleaning coated glass.

[0036] Next, prepare ordinary glass sheets, and then clean and remove static electricity from the ordinary glass sheets;

[0037] The above-mentioned self-cleaning heat-insulating coating slurry is applied to the surface of ordinary glass substrate by roller coating or spraying; the final dry film thickness is controlled at 1000 nanometers.

[0038] It then cured at 200 degrees Celsius for 5 minutes;

[0039] At a temperature of 650 degrees Celsius, the surface of the self-cleaning heat-insulating coating is tempered and sintered for 10 minutes, resulting in a piece of self-cleaning heat-insulating coated glass.

[0040] The self-cleaning heat-insulating coating layer of the above-mentioned self-cleaning heat-insulating glass was tested using the pencil test for thin films. The hardness was 6H, the hydrophilic angle was 15 degrees, and after 10 minutes of ultraviolet light irradiation, the hydrophilic angle was 4 degrees. The photolysis index was 20 nmol / (L·min), indicating that it has self-cleaning ability.

[0041] Example 3

[0042] This embodiment uses 20% by weight of cesium tungsten (particle size ≤ 50 nm) ethanol dispersion with a solid content of 30%, 50% tetraethyl orthosilicate oligomer with a degree of polymerization of 20, 2% DuPont Tyzor 107 crosslinking agent, 0.1% acetylenol defoamer, 7.9% ethanol, 10% ethylene glycol butyl ether, and 10% ethyl acetate as raw materials. After being dispersed evenly, it is used as a slurry for heat-insulating self-cleaning coated glass.

[0043] Next, prepare ordinary glass sheets; then clean and remove static electricity from the ordinary glass sheets;

[0044] The above-mentioned self-cleaning heat-insulating coating slurry is applied to the surface of ordinary glass substrate by roller coating or spraying; the final dry film thickness is controlled at 900 nanometers.

[0045] It then cured at 200 degrees Celsius for 6 minutes;

[0046] At a temperature of 680 degrees Celsius, the surface of the self-cleaning heat-insulating coating is tempered and sintered for 10 minutes, resulting in a piece of self-cleaning heat-insulating coated glass.

[0047] The self-cleaning heat-insulating coating layer of the above-mentioned self-cleaning heat-insulating glass was tested using the pencil test for thin films. The hardness was 5H, the hydrophilic angle was 18 degrees, and after 10 minutes of ultraviolet light irradiation, the hydrophilic angle was 4 degrees. The photolysis index was 15 nmol / (L·min), indicating that it has the ability to self-clean under light irradiation.

[0048] Example 4

[0049] This embodiment uses 30% AZO (particle size ≤ 50 nm) by weight, 40% aminosilane oligomer with a degree of polymerization of 50, 5% Tyzor AA75 crosslinking agent, 5% titanium dioxide with an average particle size of 5 nm, 0.1% acetylacetonate defoamer, 5% isopropanol, 5% methanol, and 9.9% ethanol as raw materials, which are dispersed evenly as a slurry for heat-insulating self-cleaning coated glass.

[0050] Next, prepare ordinary glass sheets; then clean and remove static electricity from the ordinary glass sheets;

[0051] The above-mentioned self-cleaning heat insulation coating is applied to the surface of ordinary glass substrate by roller coating or spraying; the final dry film thickness is controlled at 1000 nanometers.

[0052] It then cured at 180 degrees Celsius for 6 minutes;

[0053] At a temperature of 700 degrees Celsius, the surface of the self-cleaning heat-insulating coating is tempered and sintered after 5 minutes, resulting in a piece of self-cleaning heat-insulating coated glass.

[0054] The self-cleaning heat-insulating coating of the above-mentioned self-cleaning heat-insulating glass has a hardness of 5H and a hydrophilic angle of 12 degrees after a thin film pencil test. After 10 minutes of ultraviolet light irradiation, the hydrophilic angle of the contact angle test is 10 degrees. The photolysis index test is 23 nmol / (L·min), indicating that it has the ability to self-clean under light irradiation.

[0055] Example 5

[0056] In this embodiment, the raw materials are 10% tungsten-doped vanadium dioxide with a particle size of ≤50 nm, 10% aminosilane oligomer with a degree of polymerization of 100, 1% DuPont Tyzor AA75 crosslinking agent, 4% titanium dioxide with an average particle size of 5 nm, 10% isopropanol, 10% ethylene glycol, and 55% ethylene glycol monomethyl ether ethanol, which are dispersed evenly as a slurry for heat-insulating self-cleaning coated glass.

[0057] Next, prepare ordinary glass sheets; then clean and remove static electricity from the ordinary glass sheets;

[0058] The above-mentioned self-cleaning heat insulation coating is applied to the surface of ordinary glass substrate by roller coating or spraying; the final dry film thickness is controlled at 1000 nanometers.

[0059] It then cured at 180 degrees Celsius for 6 minutes;

[0060] At a temperature of 650 degrees Celsius, the surface of the self-cleaning heat-insulating coating is tempered and sintered for 10 minutes, resulting in a piece of self-cleaning heat-insulating coated glass.

[0061] The self-cleaning heat-insulating coating layer of the above-mentioned self-cleaning heat-insulating glass was tested by the pencil test for thin films and had a hardness of 5H. The hydrophilic angle of the contact angle test was 10 degrees. After irradiation with ultraviolet light for 10 minutes, the hydrophilic angle of the contact angle test was 2 degrees, and the photolysis index test was 30 nmol / (L·min), indicating that it has the ability to self-clean under light.

[0062] Example 6

[0063] This embodiment uses the following raw materials: 40% F-doped tin oxide (≤50 nm) ethanol dispersion with a solid content of 30% by weight, 10% γ-mercaptopropyltrimethoxysilane oligomer with a degree of polymerization of 200, 5% DuPont Tyzor AA75 crosslinking agent, 1% titanium dioxide with an average particle size of 5 nm, 0.1% acetylenol defoamer, 14% ethylene glycol ethyl ether, 15% ethylene glycol butyl ether, and 14.9% ethyl acetate ethanol. After being dispersed evenly, it is used as a slurry for heat-insulating self-cleaning coated glass.

[0064] Next, prepare ordinary glass sheets; then clean and remove static electricity from the ordinary glass sheets;

[0065] The above-mentioned self-cleaning heat insulation coating is applied to the surface of ordinary glass substrate by roller coating or spraying; the final dry film thickness is controlled at 1000 nanometers.

[0066] It then cured at 180 degrees Celsius for 6 minutes;

[0067] At a temperature of 700 degrees Celsius, the surface of the self-cleaning heat-insulating coating is tempered and sintered after 5 minutes, resulting in a piece of self-cleaning heat-insulating coated glass.

[0068] The self-cleaning heat-insulating coating layer of the above-mentioned self-cleaning heat-insulating glass was tested by the pencil test for thin films and had a hardness of 8H. The hydrophilic angle of the contact angle test was 15 degrees. After irradiation with ultraviolet light for 10 minutes, the hydrophilic angle of the contact angle test was 4 degrees, and the photolysis index test was 18 nmol / (L·min), indicating that it has the ability to self-clean under light.

[0069] Example 7

[0070] This example serves as a comparative example; it uses 20% ATO (particle size ≤ 50 nm) ethanol dispersion with a solid content of 30% by weight, 30% organosilicon prepolymer with a viscosity of 5-50 mPa, hydroxyl silicone oil (silanol-terminated polydimethylsiloxane with 4% hydroxyl content and a viscosity of 20 mPa·s), 3% polyether-modified silicone oil with a molecular weight of 6000, organosilicon sol (SiO2 content 20%, average particle size 60 nm), and a solvent system of isopropanol and tert-butanol (content 5%); 5% tetrabutyl titanate and 12.79% ethanol are used as raw materials, dispersed evenly to form a coating glass slurry.

[0071] Next, prepare ordinary glass sheets; then clean and remove static electricity from the ordinary glass sheets;

[0072] The above coating is applied to the surface of ordinary glass substrate by roller coating or spraying; the final dry film thickness is controlled at 1200 nanometers.

[0073] It then cured at 200 degrees Celsius for 15 minutes;

[0074] At a temperature of 580 degrees Celsius, the surface of the heat-insulating coating is tempered and sintered for 15 minutes, resulting in a piece of coated glass.

[0075] The coating layer of the above-mentioned coated glass, after passing the pencil test for thin films, has a hardness of 4H, a hydrophilic angle of 30 degrees, and after 10 minutes of ultraviolet light irradiation, a hydrophilic angle of 25 degrees. The photolysis index is only 1 nmol / (L·min). Even with the addition of 5% tetrabutyl titanate as a crosslinking agent in the coating solution, it does not have the function of encapsulating heat-insulating nano-semiconductors. The photolysis index of the coated glass is also far lower than the national standard GB T 37830-2019 for anti-fouling and easy-to-clean coated glass, which requires a photolysis index of not less than 15 nmol / (L·min). Therefore, it does not have self-cleaning ability.

[0076] Example 8

[0077] This example serves as a second comparative example. It employs 20% ATO (particle size ≤ 50 nm) ethanol dispersion with a solid content of 30% by weight, 30% organosilicon prepolymer with a viscosity of 5–50 mPa, 4% hydroxyl-containing polydimethylsiloxane with a silanol-terminated silanol content and a viscosity of 20 mPa·s as the hydroxyl-containing silicone oil, 3% polyether-modified silicone oil with a molecular weight of 6000, 20% SiO2 content and an average particle size of 60 nm as the organosilicon sol, and isopropanol and tert-butanol as the solvent system, each comprising 5% of the solvent. Tetraisopropyl titanate and 12.79% ethanol are used as raw materials, dispersed uniformly to form the coating glass slurry.

[0078] Next, prepare a piece of ordinary glass; then clean and remove static electricity from the ordinary glass.

[0079] The above coating is applied to the surface of ordinary glass sheet by roller coating or spraying.

[0080] Then, curing was achieved at 200 degrees Celsius for 15 minutes; the final dry film thickness was controlled at 1200 nanometers.

[0081] At a temperature of 580 degrees Celsius, the coating surface is tempered and sintered for 15 minutes, resulting in a heat-insulating coated glass.

[0082] The coating layer of the aforementioned coated glass, tested using the thin film pencil test, showed a hardness of 4H, a hydrophilic angle of 35 degrees, and after 10 minutes of UV irradiation, a hydrophilic angle of 25 degrees. The photolysis index was only 2 nmol / (L·min). Even with the addition of 5% tetraisopropyl titanate as a crosslinking agent in the coating solution, it does not possess the function of encapsulating the heat-insulating nano-semiconductors. Furthermore, the photolysis index of the coated glass is far lower than the national standard GB / T 37830-2019 for anti-fouling and easy-to-clean coated glass, which requires a photolysis index of no less than 15 nmol / (L·min). Therefore, it lacks self-cleaning capability.

[0083] In summary, the coated heat-insulating glass produced using this technical solution has significantly improved photogenerated carrier separation efficiency compared to coated glass produced by other methods. In addition to its superior performance in terms of UV aging resistance, scratch resistance, and abrasion resistance, it also exhibits a significant photocatalytic self-cleaning effect, making it a promising material for applications in the building and automotive glass industries.

Claims

1. A self-cleaning heat-reflective coated glass comprising a common glass and a self-cleaning heat-reflective coating paste, characterized by: The self-cleaning heat-insulating coating slurry is applied to ordinary glass by roller coating or spraying, and then cured on the glass surface by sintering using a glass tempering process. The self-cleaning heat-insulating coating slurry, by weight percentage, contains the following components: 10-50% organosilicon oligomers with a degree of polymerization not exceeding 200, 10-30% oxide semiconductor nanoparticles with heat-insulating function, and 1-15% nano-titanium dioxide with infrared emission and photocatalytic functions. 0.1-5% titanium coupling agent with coating function, 0.01-0.1% acetylenic diol defoamer, 10-25% organic solvent; The titanium coupling agent is a reactive organic titanate chelate with chelating function. After the coating is cured and tempered and sintered, it forms a thin layer of titanium dioxide coating on the surface of semiconductor nanoparticles and forms a heterojunction-type particle with highly interfacial composite with semiconductor nanoparticles. The coating thickness of the roll coating or spray coating is controlled at 300-2000 nanometers.

2. The method of claim 1, wherein the self-cleaning, heat-reflective coated glass is prepared by the steps of: Includes the following steps: S1. Raw material preparation: Prepare 10-50% by weight of organosilicon oligomers with a degree of polymerization not exceeding 200, 10-30% of oxide semiconductor nanoparticles with heat insulation function, and 1-15% of nano-titanium dioxide with infrared emission and photocatalytic functions. 0.1-5% titanium coupling agent with coating function, 0.01-0.1% acetylenic diol defoamer, 10-25% organic solvent, for later use; prepare ordinary glass slides for later use; S2. Add the heat-insulating nanoparticles to the solvent, then add the titanium coupling agent and stir for 10-200 minutes; add the organic solvent, organosilicon oligomer, and acetylenic diol defoamer in sequence, disperse and stir evenly to obtain a self-cleaning heat-insulating coating film. S3. Clean and remove static electricity from the ordinary glass sheet; S4. Apply the above self-cleaning heat insulation coating to the surface of ordinary glass sheet by roller coating or spraying, and heat at 160-280 degrees Celsius for 3-5 minutes to cure; S5. After curing, push it into the tempering furnace for tempering for 5 to 15 minutes. After cooling, a self-cleaning heat-insulating coated glass with both durability and high strength can be obtained. In S1, the titanium coupling agent is a reactive organic titanate chelate with chelating function. After the coating is cured and tempered and sintered, it forms a thin layer of titanium dioxide coating on the surface of semiconductor nanoparticles and forms a highly interfacial composite heterojunction particle with the semiconductor nanoparticles. In S4, the coating thickness of the roller coating or spray coating is controlled between 300 and 2000 nanometers.

3. The method for preparing a self-cleaning heat-insulating coated glass according to claim 2, characterized in that: In S2, the method for preparing the self-cleaning heat-insulating coating is as follows: S2.

1. Heat-insulating nanoparticles are added to a solvent in the form of a dispersion slurry to prepare a dispersion liquid; S2.2 Add the chelate to the dispersion and stir for 10-200 minutes to obtain the heat-insulating nano-slurry; S2.

3. Add solvent, organosilicon oligomer and acetylation diol defoamer to the slurry in sequence, and stir for 20 to 60 minutes to make it evenly mixed, so as to obtain a self-cleaning heat insulation coating film.

4. The method for preparing a self-cleaning heat-insulating coated glass according to claim 2, characterized in that: In S1, the organosilicon oligomer is any one or more of methyl orthosilicate oligomer, ethyl orthosilicate oligomer, amino organosilicon oligomer, epoxy organosilicon oligomer, and γ-mercaptopropyltrimethoxysilane oligomer; the degree of polymerization of the organosilicon oligomer is 5 to 100.

5. The method for preparing a self-cleaning heat-insulating coated glass according to claim 2, characterized in that: In S1, the oxide semiconductor nanoparticles are any one or more of nano-tin antimony oxide, nano-indium tin oxide, or nano-cesium tungsten, or aluminum-doped zinc oxide.

6. The method for preparing a self-cleaning heat-insulating coated glass according to claim 2, characterized in that: In S1, the oxide semiconductor nanoparticles are solvent-based or aqueous dispersions with an average particle size of no more than 50 nanometers.

7. The method for preparing a self-cleaning heat-insulating coated glass according to claim 2, characterized in that: In S1, the nano-titanium dioxide is a solvent-based or aqueous dispersion slurry of anatase or rutile type with an average particle size of no more than 20 nanometers, either alone or in combination with both.

8. The method for preparing a self-cleaning heat-insulating coated glass according to claim 2, characterized in that: In S1, the organic solvent is one or more of methanol, ethanol, isopropanol, ethylene glycol, ethylene glycol monomethyl ether, ethylene glycol ethyl ether, ethylene glycol butyl ether, and ethyl acetate.

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