Preparation method and application of novel crystal glass surface nano self-cleaning coating

Abstract

The invention provides a preparation method and application of a novel crystal glass surface nano self-cleaning coating, and belongs to the technical field of self-cleaning coatings, the method comprises the following steps: (1) pretreatment of a base material: cleaning the glass surface by adopting oxygen plasma, removing organic matters and activating; (2) spraying a bottom coating: mixing 10-15 parts of nano silicon dioxide sol and 3-5 parts of a silane coupling agent, and curing at 120-150 DEG C for 30 minutes after spraying; (3) coating a functional layer; and (4) post-treatment: after ultraviolet curing, carrying out heat treatment at 180-200 DEG C for 10 minutes to form a compact cross-linked structure. Through material innovation (such as nitrogen-doped titanium dioxide and a dynamic disulfide bond ultraviolet light absorber) and process optimization (low-temperature curing and electrostatic atomization), the three major problems of single function, short service life and complex process of a traditional coating are solved, meanwhile, the coating is expanded to the scenes of photovoltaics, automobiles, buildings and the like, and the comprehensive advantages of being efficient, self-cleaning, long-acting, durable and environmentally friendly are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of self-cleaning coatings, and specifically to a preparation method and application of a novel nano self-cleaning coating on the surface of crystal glass. Background Art

[0002] Any coating that can be used on the surface of a substrate (such as glass ceramics or wood stone, etc.) and relies on the hydrophobic and hydrophilic physical properties of the coating itself to achieve anti-fouling and easy cleaning (also known as self-cleaning in commerce) functions. The coating prepared by the self-cleaning coating is a self-cleaning coating. The traditional crystal glass self-cleaning coating technology has the following core defects:

[0003] Functional singularity: Existing coatings mostly rely on a single superhydrophilic (such as titanium dioxide photocatalysis) or superhydrophobic (such as fluorosilane modification) principle and cannot meet the different environmental requirements. For example, the superhydrophilic coating fails due to the lack of rainwater flushing in arid regions, while the superhydrophobic coating has its self-cleaning ability reduced due to electrostatic dust adsorption.

[0004] Insufficient durability: Long-term ultraviolet irradiation easily causes photo-degradation of the coating (such as fracture of organic components), resulting in a decline in contact angle (annual decline rate > 10%) and a reduction in light transmittance (< 85%), and it is easy to crack and peel off under high or low temperature environments.

[0005] Poor process complexity and compatibility: Traditional processes require high-temperature sintering (> 500 °C) or vacuum coating equipment, which are difficult to be compatible with existing glass production lines (such as the float process), and the coating thickness control accuracy is low (± 5 μm), affecting the light transmittance and mechanical properties.

[0006] Environmental and cost limitations: Some coatings use organic solvents (VOCs emissions) or precious metal materials (such as silver nanoparticles), resulting in high costs and environmental pollution.

[0007] Therefore, a preparation method and application of a novel nano self-cleaning coating on the surface of crystal glass are proposed. Summary of the Invention

[0008] The present invention aims to solve the problems raised in the background art and provides a preparation method and application of a novel nano self-cleaning coating on the surface of crystal glass.

[0009] The specific technical solutions are as follows:

[0010] A preparation method of a novel nano self-cleaning coating on the surface of crystal glass includes the following steps:

[0011] (1) Substrate pretreatment: Clean the glass surface with oxygen plasma to remove organic substances and activate it;

[0012] (2) Substrate coating spraying: Mix nano-silica sol (10 - 15 parts) and silane coupling agent (3 - 5 parts), spray and then cure at 120 - 150 °C for 30 min;

[0013] (3) Functional layer coating: Disperse nano-titanium dioxide sol (8 - 12 parts), fluoropolymer (5 - 10 parts), ultraviolet absorber (2 - 4 parts), and conductive nano-indium tin oxide (1 - 3 parts) in solvent (60 - 80 parts), ultrasonically treat and then spray, and cure with ultraviolet light (wavelength 254 nm, intensity 5 mW / cm 2 );

[0014] (4) Post-treatment: After ultraviolet curing, heat-treat at 180 - 200 °C for 10 min to form a dense cross-linked structure.

[0015] In the above preparation method of the novel nano self-cleaning coating on the surface of crystal glass, wherein, the preparation of the ultraviolet absorber described in step (3) includes:

[0016] React cyanuric chloride with resorcinol at low temperature to generate an intermediate, then esterify with methyl chloroacetate, and finally cross-link with 2,2,4,4-tetrahydroxybenzophenone to form a self-repairing ultraviolet absorption network.

[0017] In the above preparation method of the novel nano self-cleaning coating on the surface of crystal glass, wherein, electrostatic atomization process is used for spraying in steps (2) and (3), and the total thickness of the coating is controlled within 1 - 3 μm.

[0018] In the above preparation method of the novel nano self-cleaning coating on the surface of crystal glass, wherein, the solvent is a mixed solution of ethanol and deionized water with a volume ratio of 3:1, and 0.1% sodium dodecyl sulfate is added as a dispersant.

[0019] In the above preparation method of the novel nano self-cleaning coating on the surface of crystal glass, wherein, the particle size of the nano-silica sol is 20 - 50 nm, and the surface is modified with fluorosilane, the contact angle ≥ 150°, and the rolling angle ≤ 5°.

[0020] In the above preparation method of the novel nano self-cleaning coating on the surface of crystal glass, wherein, the nano-titanium dioxide is modified by nitrogen doping, and the visible light response range is extended to 600 nm.

[0021] In the above preparation method of the novel nano self-cleaning coating on the surface of crystal glass, wherein, 0.5 - 2 parts of hydrophobic carbon nanotubes are added in step (3) to improve the mechanical strength of the coating, so that its wear resistance ≥ 5000 friction cycles.

[0022] In the above preparation method of the novel nano self-cleaning coating on the surface of crystal glass, wherein, the addition of the conductive nano-indium tin oxide makes the surface resistance of the coating ≤ 1 × 10^4 Ω, inhibiting electrostatic adsorption of dust.

[0023] The preparation method of the above-mentioned novel nano self-cleaning coating on the surface of crystal glass, wherein the ultraviolet absorber enables the coating to have a durability of ≥ 3 years and a contact angle change rate of ≤ 5% in an environment of -30°C to 80°C.

[0024] The present invention also provides an application of a novel nano self-cleaning coating on the surface of crystal glass, characterized in that the coating is used in the following fields:

[0025] Photovoltaic glass, with a light transmittance of ≥ 92% and a photocatalytic degradation efficiency of organic pollutants of ≥ 90% (within 24 hours);

[0026] Automobile windshield, with an ice formation delay time of ≥ 2 hours (in an environment of -10°C);

[0027] Building curtain wall glass, with a nylon / carbon fiber reinforced mesh layer (pore size 50 - 100 μm) embedded on the surface, scratch-resistant and reducing rainwater retention.

[0028] The present invention has the following beneficial effects:

[0029] Through organic-inorganic hybrid design, multi-functional material compounding and low-temperature high-efficiency process, the present invention achieves the following breakthrough effects:

[0030] 1. Multi-functional synergistic self-cleaning

[0031] Superhydrophobic-photocatalytic synergy: The combination of fluorosilane-modified nano-silica (contact angle ≥ 150°) and nitrogen-doped titanium dioxide (visible light response up to 600 nm), with the synergistic effect of rainwater scouring and photocatalytic degradation, the degradation rate of organic pollutants is ≥ 90% within 24 hours (ISO10678 test), suitable for arid or rainy environments.

[0032] Antistatic dust suppression: Conductive nano-indium tin oxide (surface resistance ≤ 1 × 10^4 Ω) inhibits electrostatic adsorption, and the dust adhesion amount is reduced by ≥ 60% (ASTM D3719 test).

[0033] 2. Long-term durability

[0034] Self-repairing anti-aging: The combination of a dynamic disulfide bond ultraviolet absorber (ultraviolet shielding rate ≥ 95% after 3000 hours of aging) and a dense cross-linked structure (porosity ≤ 1%) enables the coating to have a lifespan of ≥ 3 years in an environment of -30°C to 80°C (QUV accelerated aging test), and the contact angle change rate is ≤ 5%.

[0035] Enhanced mechanical stability: The combination of hydrophobic carbon nanotubes (wear resistance ≥ 5000 friction cycles) and a nylon / carbon fiber reinforced mesh layer (scratch-resistant Mohs hardness ≥ 6) improves the impact resistance by 40% (ASTM D2794 test).

[0036] 3. Process Compatibility and Environmental Friendliness

[0037] Low-temperature and high-efficiency process: The combination of ultraviolet curing (5 mW / cm 2 , 5 min) and low-temperature heat treatment (≤200 °C) is adapted to the float glass production line, reducing energy consumption by 50%.

[0038] Environmental friendliness: The water-based solvent system (ethanol / water volume ratio of 3:1) has no VOCs emissions, and the raw material utilization rate ≥ 90% (electrostatic atomization process).

[0039] 4. Expansion of Application Scenarios

[0040] Photovoltaic glass: The light transmittance ≥ 92% (wavelength of 400 - 800 nm), and the annual power generation efficiency is increased by 12%;

[0041] Automobile glass: The ice formation delay time ≥ 2 h (-10 °C), and the wiper wear rate is reduced by 50%;

[0042] Building curtain wall: The surface retained water volume ≤ 0.1 g / m 2 , and the maintenance cost is reduced by 30%. Description of the Drawings

[0043] Figure 1 It is a flowchart of the preparation method of the novel nano self-cleaning coating on the surface of crystal glass provided by the embodiment of the present invention. Detailed Embodiments

[0044] The technical solutions of the present invention will be further described below with reference to the drawings and through specific embodiments.

[0045] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and cannot be understood as a limitation of this patent; in order to better illustrate the embodiments of the present invention, some components in the drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual products; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0046] In the drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if terms such as "upper", "lower", "left", "right", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0047] In the description of the present invention, unless otherwise clearly specified and defined, if terms such as "connection" are used to indicate the connection relationship between components, such terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] Example 1

[0049] The preparation method of the novel nano self-cleaning coating on the surface of crystal glass provided in this example includes the following steps:

[0050] (1) Substrate pretreatment: Clean the glass surface with oxygen plasma (power 300W, oxygen flow rate 10L / min) for 10 - 15 minutes to remove organic substances and generate hydroxyl activation sites;

[0051] (2) Primer coating spraying: Mix nano-silica sol modified with fluorosilane (10 - 15 parts) with particle size of 20 - 50nm and silane coupling agent KH-570 (3 - 5 parts) by weight, spray at a pressure of 0.2 - 0.5MPa, and cure at 120 - 150°C for 30 minutes to form a superhydrophobic bottom layer (contact angle ≥150°, rolling angle ≤5°);

[0052] (3) Functional layer coating: Mix nitrogen-doped nano-titanium dioxide sol (8 - 12 parts, visible light response up to 600nm), hexafluorobutyl methacrylate (5 - 10 parts), self-healing ultraviolet absorber (2 - 4 parts), conductive nano-indium tin oxide (ITO, 1 - 3 parts) with a solvent (ethanol / deionized water volume ratio 3:1, containing 0.1% sodium dodecyl sulfate), ultrasonically disperse for 30 minutes and then spray, and cure with ultraviolet light (wavelength 254nm, intensity 5mW / cm 2 , irradiation time 5 minutes);

[0053] (4) Post-treatment: After ultraviolet curing, heat-treat at 180 - 200°C for 10 minutes to form a dense cross-linked network structure (porosity ≤1%).

[0054] For the preparation method of the novel nano self-cleaning coating on the surface of crystal glass, pretreatment of the substrate with oxygen plasma can enhance the coating adhesion (adhesion tested by cross-cut method ≥4B), the prepared bottom layer has superhydrophobic properties to reduce dirt adhesion, nitrogen-doped titanium dioxide can improve the visible light catalytic efficiency (degradation efficiency of methylene blue in 24 hours ≥90%), and the porosity decreases after heat treatment, resulting in a significant improvement in anti-aging performance.

[0055] Among them, the preparation method of the ultraviolet absorber is as follows:

[0056] Cyanuric chloride and resorcinol (molar ratio 1:1.2) are reacted at 0 - 5 °C for 4 h to form intermediate A;

[0057] Intermediate A and methyl chloroacetate (molar ratio 1:1) are subjected to an esterification reaction at 60 °C for 2 h to form intermediate B;

[0058] Intermediate B and 2,2,4,4 - tetrahydroxybenzophenone (molar ratio 1:0.8) are crosslinked at 80 °C for 3 h to form a self - healing network with dynamic disulfide bonds.

[0059] The prepared ultraviolet absorber achieves self - healing through the cleavage - recombination of disulfide bonds under light. After aging for 300 h, the ultraviolet absorption rate remains ≥95%, and the intramolecular hydrogen bonds enhance the thermal stability (thermal decomposition temperature ≥300 °C).

[0060] Among them, in steps (2) and (3), electrostatic atomization process is used for spraying (voltage 30 - 50 kV, gun distance from the substrate 20 - 30 cm), and the total thickness of the coating is controlled within 1 - 3 μm (error ±0.2 μm).

[0061] Technical effect: Electrostatic atomization can improve the raw material utilization rate (≥90%), avoid local failure caused by uneven coating, and the precise thickness control can balance the light transmittance (≥92%) and wear resistance.

[0062] Among them, the volume ratio of ethanol to deionized water in the solvent is 3:1, and 0.1% sodium dodecyl sulfate is added as a dispersant. After ultrasonic dispersion, the absolute value of the Zeta potential of the slurry is ≥30 mV.

[0063] Technical effect: Optimizing the solvent ratio can avoid nanoparticle aggregation (standard deviation of DLS - detected particle size distribution ≤5 nm), and the absolute value of the Zeta potential of the slurry ≥30 mV after ultrasonic dispersion can improve the slurry stability (no sedimentation after standing for 7 days).

[0064] Among them, the nano - silica sol is modified with perfluorooctyltriethoxysilane (PFOTES). After modification, the surface fluorine content is ≥8 at% (detected by XPS), the contact angle is ≥150°, and the rolling angle is ≤5°.

[0065] Technical effect: The high fluorine content endows super - hydrophobicity (contact angle ≥150°), and rainwater can quickly roll off to carry away dust; the rolling angle ≤5° can effectively reduce the residence time of surface water droplets (≤0.5 s).

[0066] Among them, the nano-titanium dioxide is modified by nitrogen doping (the nitrogen source is urea, the calcination temperature is 450 °C, and the time is 2 h). XRD shows that the crystal form is a mixed phase of anatase and rutile (the ratio is 7:3), and the visible light absorption edge is redshifted to 600 nm.

[0067] Technical effect: The mixed-phase structure can inhibit the recombination of photo-generated electrons and holes, and the photocatalytic efficiency is increased by 30% (compared with the undoped one). The visible light response range is extended to 600 nm, and pollutants can still be degraded under weak indoor light conditions.

[0068] Among them, 0.5 - 2 parts of hydrophobic carbon nanotubes (with a diameter of 20 - 30 nm and an aspect ratio ≥ 100) are added in step (3). The surface is grafted with perfluoroalkyl chains (the grafting rate ≥ 85%), and the wear resistance of the coating reaches 5000 friction cycles (Taber abrasion tester, CS-10 grinding wheel, 500 g load).

[0069] Technical effect: The three-dimensional network formed by carbon nanotubes can effectively enhance the mechanical strength (the elastic modulus ≥ 2 GPa); the perfluoroalkyl chains can effectively improve the hydrophobicity (the contact angle drop after friction ≤ 3%).

[0070] Among them, the conductive nano-indium tin oxide (ITO) has a particle size of 30 - 50 nm, a resistivity ≤ 1 × 10^-3 Ω·cm, and the surface resistance of the coating ≤ 1 × 10^4 Ω (tested by the four-probe method).

[0071] Technical effect: The reduction of the surface resistance can effectively inhibit electrostatic adsorption (the dust adhesion amount is reduced by ≥ 60%). The light transmittance of ITO (≥ 90%) and conductivity cooperate to significantly improve the power generation efficiency of photovoltaic glass (compared with the uncoated glass +12%).

[0072] Among them, the ultraviolet absorber adjusts the molecular chain movement through dynamic disulfide bonds in the environment of -30 °C to 80 °C, so that the durability of the coating ≥ 3 years (QUV accelerated aging test for 3000 h), and the contact angle change rate ≤ 5%.

[0073] Technical effect: The wide temperature range adaptability can meet the needs of extreme climates (no cracking after 100 high and low temperature cycles), and the self-healing function enables the ultraviolet shielding rate to be stable for a long time (≥ 92% after 3 years).

[0074] Example 2

[0075] This example provides an application of the nano-self-cleaning coating prepared by the above method. The coating is used in the following fields:

[0076] Photovoltaic glass: The light transmittance ≥ 92% (detected by a spectrophotometer, wavelength 400 - 800 nm), and the efficiency of photocatalytic degradation of organic pollutants ≥ 90% (within 24 h, test standard ISO10678:2010);

[0077] Automobile windshield: Ice formation delay time ≥ 2 h (tested according to ASTM D7195 standard in an environment of -10°C), wiper wear rate reduced by 50%;

[0078] Building curtain wall glass: A nylon / carbon fiber composite reinforcement mesh layer is embedded on the surface (pore diameter 50 - 100 μm, tensile strength ≥ 1.2 GPa), scratch-resistant (Mohs hardness ≥ 6) and rainwater retention reduced (surface retained water volume ≤ 0.1 g / m 2 ).

[0079] Technical effects:

[0080] The power generation efficiency of photovoltaic glass is improved in coordination with self-cleaning, and the annual maintenance cost is reduced by 30%;

[0081] The delay in ice formation on automobile glass improves driving safety;

[0082] The scratch-resistant performance of the building curtain wall extends the service life ≥ 5 years.

[0083] Among them, the basic performance tests of the coating are as follows:

[0084]

[0085] The data in this table show that: contact angle ≥ 150° (rainwater self-cleaning) + visible light catalytic efficiency ≥ 90% (chemical degradation), and the comprehensive self-cleaning efficiency is increased by 200%.

[0086] Photocatalytic self-cleaning performance

[0087]

[0088]

[0089] The data in this table show that: the self-cleaning performance of the novel crystal glass surface nano self-cleaning coating of the present invention has been greatly improved.

[0090] Durability and environmental adaptability

[0091]

[0092] The data in this table show that: after 3000 h of QUV aging, the ultraviolet shielding rate of the novel crystal glass surface nano self-cleaning coating is > 95%, far exceeding the industry conventional coating (< 80%)

[0093] Measured data of application scenarios

[0094]

[0095] The data in this table show that: the novel crystal glass surface nano self-cleaning coating has excellent performance in different application scenarios.

[0096] Key Data of Self-Healing Ultraviolet Absorbent

[0097]

[0098] The data in this table indicate that the novel nano self-cleaning coating on the surface of crystal glass has excellent self-healing performance.

[0099] Description of Experimental Methods

[0100] Photocatalytic degradation rate: Referring to ISO 10678, the change in absorbance of methylene blue solution was measured using a UV-visible spectrophotometer.

[0101] Abrasion resistance test: According to ASTM D4060, a Taber abrasion tester was used with a CS-10 grinding wheel and a 500 g load for cyclic friction.

[0102] Self-healing verification: The repair process was observed by micro-area scratch test (nanoindentation instrument) combined with SEM, and the change in chemical bonds was analyzed simultaneously using Raman spectroscopy.

[0103] Power generation efficiency test: Under standard test conditions (AM1.5, 1000 W / m 2 ), the I-V curves of coated and uncoated photovoltaic modules were compared.

[0104] In summary, the preparation method of the novel nano self-cleaning coating on the surface of crystal glass provided in this embodiment has the following advantages:

[0105] 1. Multifunctional Synergistic Self-Cleaning

[0106] Superhydrophobic-photocatalytic synergy: Fluorosilane-modified nano-silica (contact angle ≥ 150°) is combined with nitrogen-doped titanium dioxide (visible light response up to 600 nm). The synergistic effect of rainwater flushing and photocatalytic degradation results in an organic pollutant degradation rate of ≥ 90% within 24 h (ISO10678 test), suitable for arid or rainy environments.

[0107] Antistatic dust suppression: Conductive nano-indium tin oxide (surface resistance ≤ 1 × 10^4 Ω) inhibits electrostatic adsorption, and the dust adhesion amount is reduced by ≥ 60% (ASTM D3719 test).

[0108] 2. Long-Term Durability

[0109] Self-healing anti-aging: The dynamic disulfide bond ultraviolet absorbent (ultraviolet shielding rate ≥ 95% after 3000 h of aging) and the dense cross-linked structure (porosity ≤ 1%) work together. The coating has a lifespan of ≥ 3 years in the environment of -30°C to 80°C (QUV accelerated aging test), and the contact angle change rate ≤ 5%.

[0110] Enhanced mechanical stability: The combination of hydrophobic carbon nanotubes (abrasion resistance ≥ 5000 friction cycles) and a nylon / carbon fiber reinforced mesh layer (scratch-resistant Mohs hardness ≥ 6) results in a 40% improvement in impact resistance (ASTM D2794 test).

[0111] 3. Process Compatibility and Environmental Friendliness

[0112] Low-temperature and highly efficient process: The combination of ultraviolet curing (5 mW / cm 2 , 5 min) and low-temperature heat treatment (≤ 200 °C) is compatible with the float glass production line, reducing energy consumption by 50%.

[0113] Environmental friendliness: The water-based solvent system (ethanol / water volume ratio 3:1) has no VOC emissions, and the raw material utilization rate ≥ 90% (electrostatic atomization process).

[0114] 4. Expansion of Application Scenarios

[0115] Photovoltaic glass: The light transmittance ≥ 92% (wavelength 400 - 800 nm), and the annual power generation efficiency is increased by 12%;

[0116] Automobile glass: The icing delay time ≥ 2 h (-10 °C), and the wiper wear rate is reduced by 50%;

[0117] Building curtain wall: The surface retained water volume ≤ 0.1 g / m 2 , and the maintenance cost is reduced by 30%.

[0118]

[0119] In summary:

[0120] Through material innovation (such as nitrogen-doped titanium dioxide and dynamic disulfide ultraviolet absorbers) and process optimization (low-temperature curing and electrostatic atomization), the present invention solves the three major pain points of traditional coatings, namely single function, short lifespan, and complex processes. At the same time, it is extended to scenarios such as photovoltaics, automobiles, and buildings, with comprehensive advantages of high-efficiency self-cleaning, long-lasting durability, and environmental friendliness, and has significant market competitiveness.

[0121] The above are only the preferred embodiments of the present invention, and do not limit the implementation manners and protection scope of the present invention. For those skilled in the art, it should be realized that any equivalent substitution and obvious changes made by using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a novel nano self-cleaning coating on the surface of crystal glass, characterized in that: The following steps are involved: (1) Substrate pretreatment: Use oxygen plasma to clean the glass surface to remove organic matter and activate it; (2) Primer spraying: Mix 10-15 parts of nano-silica sol with 3-5 parts of silane coupling agent, and cure at 120-150°C for 30 minutes after spraying; (3) Functional layer coating: 8-12 parts of nano titanium dioxide sol, 5-10 parts of fluorine-containing polymer, 2-4 parts of ultraviolet absorber, and 1-3 parts of conductive nano indium tin oxide are dispersed in 60-80 parts of solvent, and then sprayed after ultrasonic treatment. 2 Curing; (4) Post-treatment: After UV curing, heat treatment is performed at 180-200°C for 10 min to form a dense cross-linked structure.

2. The method for preparing the novel crystal glass surface nano self-cleaning coating according to claim 1, characterized in that: The preparation of the ultraviolet absorber in step (3) comprises: Cyanuric chloride and resorcinol react at low temperature to generate an intermediate, which is then esterified with methyl chloroacetate and finally cross-linked with 2,2,4,4-tetrahydroxybenzophenone to form a self-healing UV-absorbing network.

3. The method for preparing the novel crystal glass surface nano self-cleaning coating according to claim 1, characterized in that: In steps (2) and (3), the spraying adopts an electrostatic atomization process, and the total thickness of the coating is controlled at 1-3 μm.

4. The method for preparing the novel nano self-cleaning coating on the surface of crystal glass according to claim 1, characterized in that: The solvent is a mixture of ethanol and deionized water at a volume ratio of 3:1, and 0.1% sodium dodecyl sulfate is added as a dispersant.

5. The method for preparing the novel crystal glass surface nano self-cleaning coating according to claim 1, characterized in that: The particle size of the nano-silica sol is 20-50 nm, and the surface is modified by fluorosilane, with a contact angle of ≥150° and a rolling angle of ≤5°.

6. The method for preparing the novel nano self-cleaning coating on the surface of crystal glass according to claim 1, characterized in that: The nano titanium dioxide is modified by nitrogen doping, and the visible light response range is extended to 600nm.

7. The method for preparing the novel nano self-cleaning coating on the surface of crystal glass according to claim 1, characterized in that: In step (3), 0.5-2 parts of hydrophobic carbon nanotubes are added to improve the mechanical strength of the coating so that its wear resistance is ≥ 5000 friction cycles.

8. The method for preparing the novel crystal glass surface nano self-cleaning coating according to claim 1, characterized in that: The addition of the conductive nano-indium tin oxide makes the surface resistance of the coating ≤1×10^4Ω, thereby suppressing electrostatic adsorption of dust.

9. The method for preparing the novel nanometer self-cleaning coating on the surface of crystal glass according to claim 1, characterized in that: The ultraviolet absorber makes the coating durability ≥3 years and the contact angle change rate ≤5% under the environment of -30°C to 80°C.

10. An application of a nanometer self-cleaning coating prepared by the method for preparing a novel nanometer self-cleaning coating on a crystal glass surface according to any one of claims 1 to 9, characterized in that: The coating is used in the following areas: Photovoltaic glass, light transmittance ≥ 92%, photocatalytic degradation efficiency of organic pollutants ≥ 90% within 24 hours; Car windshield, at -10℃, ice delay time ≥2h; The building curtain wall glass has a nylon / carbon fiber reinforced mesh layer embedded on the surface with a pore size of 50-100μm, which is scratch-resistant and reduces rainwater retention.

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