High-durability transparent super-oleophobic coating and preparation method thereof

Abstract

The invention discloses a high-durability transparent super-oleophobic coating and a preparation method thereof.The preparation method comprises the steps that firstly, ethyl alcohol and isopropyl alcohol are mixed in proportion to form a mixed solvent, then fumed silica, aluminum oxide and titanium dioxide and zirconium oxide nano-particles are added into the mixed solvent, stirring is conducted, and the high-durability transparent super-oleophobic coating is obtained; stirring and dispersing to construct a uniform and stable inorganic particle dispersion system; then, PFOTS, TEOS and NH3.H2O are added into the dispersion liquid to be subjected to a hydrolytic condensation reaction under the stirring condition, surface modification of the inorganic particles is achieved, then, a silane sol type primer is prepared, the silane sol type primer and the modified suspension liquid are evenly sprayed to the surface of a carrier in sequence, and the carrier is obtained. And drying to finally form the coating with high transparency and excellent super-oleophobicity. The method is simple in process and high in controllability, and the obtained coating has excellent transparency, super-oleophobicity and stability and is suitable for surfaces of glass, optical elements and other base materials needing to maintain high transparency and anti-pollution performance.

Description

Technical Field

[0001] This invention belongs to the field of functional materials technology, and relates to superoleophobic coating equipment, specifically to a transparent, highly durable superoleophobic coating and its preparation method. Background Technology

[0002] Superoleophobic surfaces, due to their high contact angle and low adhesion to low surface tension liquids, have significant application value in fields such as anti-fouling and self-cleaning, fingerprint resistance, optical device protection, oil-water separation, microfluidic chips, and surface anti-fouling for high-end display devices. However, compared with mature superhydrophobic technologies, the construction of superoleophobic coatings still faces significant technical challenges. The fundamental reason is that oily liquids generally have low surface tension, making it difficult to achieve effective repulsion through traditional combinations of rough structures and hydrophobic groups. Therefore, superoleophobic coatings typically require surface chemical modifications with lower surface energy and the construction of more refined micro / nano structures.

[0003] Existing superoleophobic coatings mainly rely on the following two strategies: (1) reducing surface free energy by introducing low surface energy materials such as perfluoroalkylsilanes and fluoropolymers; (2) constructing micro-nano rough structures using materials such as silica, titanium dioxide, and carbon-based nanomaterials to form reentry structures to support oil droplets. However, existing methods still have the following shortcomings: First, some preparation methods rely on complex chemical vapor deposition or plasma treatment, which are costly and have demanding process conditions, making them unsuitable for large-scale promotion; Second, many coatings often sacrifice transparency while maintaining superoleophobic properties, making it difficult to balance optical transmittance and limiting their application in optical devices and displays; Third, some coatings have insufficient mechanical stability and are prone to losing their superoleophobic properties after cleaning or slight friction; Fourth, uneven surface modification or difficulty in controlling coating thickness also affects the repeatability and scalability of applications.

[0004] To address these issues, researchers have recently begun employing low-cost, large-area fabrication methods such as sol-gel and spray coating. These methods disperse nanoparticles in mixed solvents and combine them with silane coupling agents for surface chemical modification, resulting in composite coatings that combine transparency, low surface energy, and well-structured surface microstructure. However, traditional sol-gel systems still suffer from problems such as particle agglomeration, poor coating uniformity, and incomplete reactions, leading to unstable coating transparency and superoleophobic properties.

[0005] Therefore, there is an urgent need for a superoleophobic interface material that can maintain good optical performance and effectively repel various low surface tensions, so as to meet the application needs of optical devices, precision instruments, and oil-sensitive surface protection. Summary of the Invention

[0006] The purpose of this invention is to provide a high-durability transparent superoleophobic coating and its preparation method. The coating process is simple, the film formation is uniform, the transparency is high, and it has stable superoleophobic and self-cleaning properties.

[0007] This invention is achieved through the following technical solution: A method for preparing a highly durable transparent superoleophobic coating includes the following steps: Step 1: Mix 10-15 mL of ethanol with 10-15 mL of isopropanol to obtain a homogeneous mixed solvent; then add 0.10-0.15 g of fumed silica, 0.05-0.10 g of alumina, 0.01-0.05 g of titanium dioxide, and 0.01-0.05 g of zirconium oxide to the mixture and stir to form a homogeneous dispersion. Step 2: Add 0.1-1% of perfluorooctyltrichlorosilane, 0.1% of tetraethyl orthosilicate, and 20% of ammonia water by mass to the dispersion prepared in Step 1, and stir to form a uniform suspension. Step 3: Dissolve 2.5–10 g of tetraethyl orthosilicate and 0.5 g of aminopropyltriethoxysilane in 45 mL of ethanol, add 5 mL of deionized water and 1 mL of ammonia, stir at room temperature for 1–6 h and let stand for 6–24 h to form a uniform and stable silane sol-type primer. Step 4: Apply 1 to 5 layers of silane sol-type primer obtained in Step 3 to the carrier surface using a spray gun. After drying, apply 1 to 20 layers of the suspension obtained in Step 2. After spraying, dry to form a super oleophobic functional layer.

[0008] The present invention also has the following technical features: Preferably, the mass concentration of the ammonia water in steps one and two is 25 wt%.

[0009] Preferably, the stirring duration in steps one and two is 10 to 12 hours.

[0010] Preferably, the carrier mentioned in step four includes transparent glass, quartz, or ceramic.

[0011] Preferably, the carrier described in step [1] is ultrasonically cleaned in ethanol for 10-20 min before spraying the silane sol-type primer, and then washed three times each with ethanol and deionized water; after washing, it is dried with nitrogen gas.

[0012] Preferably, in step four, the suspension obtained in step two and the silane sol-type primer obtained in step three are subjected to ultrasonic treatment for 10 to 30 minutes before spraying.

[0013] Preferably, during the spraying process described in step four, the spray gun pressure is 0.05 to 0.5 MPa, the spray gun maintains a vertical distance of 10 to 30 cm from the carrier, and moves at a horizontal speed of 2 cm / s.

[0014] Preferably, nitrogen-assisted atomization spraying is used when spraying the silane sol-type primer and the superoleophobic functional layer in step four.

[0015] Preferably, the drying process in step four involves placing the object in the air and drying it for about 30 minutes or using hot air to assist drying for 5 to 10 minutes.

[0016] This invention also protects a highly durable, transparent, superoleophobic coating prepared using the method described above.

[0017] Compared with the prior art, the present invention has the following technical effects: This invention combines four inorganic particles—fumed silica, alumina, titanium dioxide, and zirconium oxide—and utilizes the differences in particle size to construct a multi-scale composite rough structure within the coating. This not only satisfies the requirement of a "re-entry" rough surface for superoleophobic coatings but also reduces light scattering and reflection through the interparticle gaps and refractive index matching, thus forming a highly transparent superoleophobic coating. Under alkaline conditions, PFOTS (perfluorooctyltriethoxysilane) and TEOS (tetraethyl orthosilicate) undergo synergistic hydrolytic condensation to form an organosilicon modified layer that is covalently grafted onto the surface of inorganic particles. TEOS provides a crosslinking network, enhancing the bonding stability between the modified layer and the particles. PFOTS introduces perfluoroalkyl groups, significantly reducing the surface free energy of the coating and avoiding the problem of easy detachment of low surface energy groups in traditional physical coatings, thus significantly improving the coating's ability to repel low surface tension oils. This invention introduces a silane sol-type primer, through which the amino group of aminopropyl reacts with the hydroxyl group on the carrier surface, and at the same time, the silanol group formed by the hydrolysis of tetraethyl orthosilicate crosslinks with the hydroxyl group of inorganic particles in the functional layer, thereby constructing a strong bonding interface of "substrate-primer-functional layer" and improving the adhesion and stability of the superoleophobic coating. The present invention has a simple process, low cost, and is easy to scale up for production. Attached Figure Description

[0018] Figure 1 The transmittance curves of each layer of the high-durability transparent superoleophobic surface functional coating prepared in Example 1 in the visible light range. Figure 2 Bar chart showing the organic solvent stability test results of the high-durability transparent superoleophobic surface and interface functional coating prepared in Example 2; Figure 3 Bar chart of sand impact test results for the high-durability transparent superoleophobic surface functional coating prepared in Example 2; Figure 4 The graph shows the water contact angle (WCA), water roll-off angle (WSA), oil contact angle (OCA), and oil roll-off angle (OSA) data of the high-durability transparent superoleophobic surface and interface functional coating prepared in Example 3 under different coating numbers. Figure 5 Chemical stability test of the high-durability transparent superoleophobic surface and interface functional coating prepared in Example 4; Figure 6 Experiments were conducted to assess the temperature tolerance of the highly durable, transparent, superoleophobic surface functional coating prepared in Example 5. Detailed Implementation The present invention will be further described in detail below with reference to specific embodiments. These descriptions are for explanation purposes only and are not intended to limit the scope of the invention.

[0019] The ammonia solution used in the following examples has a mass concentration of 25 wt%.

[0020] Example 1 This embodiment provides a highly durable, transparent, superoleophobic surface and interface functional coating, the preparation method of which includes the following steps: Step 1: Mix 10 mL of ethanol with 10 mL of isopropanol to obtain a homogeneous mixed solvent; then add 0.10 g of fumed silica, 0.05 g of alumina, 0.01 g of titanium dioxide, and 0.02 g of zirconium oxide to the mixture and stir for 10 h to form a homogeneous dispersion. Step 2: Add 0.5% by mass of perfluorooctyltrichlorosilane, 0.1% by mass of tetraethyl orthosilicate and 20% by mass of ammonia water to the dispersion prepared in Step 1, and stir for 10 h to allow TEOS and PFOTS to be fully hydrolyzed, condensed and modified on the particle surface to form a uniform suspension. Step 3: Dissolve 5 g of tetraethyl orthosilicate and 0.5 g of aminopropyltriethoxysilane in 45 mL of ethanol, add 5 mL of deionized water and 1 mL of ammonia, stir at room temperature for 2 h and let stand for 12 h to form a uniform and stable silane sol primer. Step 4: Place the transparent glass in ethanol for ultrasonic cleaning for 20 minutes, then wash it three times each with ethanol and deionized water; after washing, dry it with nitrogen gas. The suspension obtained in step two and the silane sol-type primer obtained in step three were subjected to ultrasonic treatment for 30 min respectively. Using a spray gun at a nitrogen pressure of 0.2 MPa, with the spray gun at a vertical distance of 15 cm from the carrier and moving at a horizontal speed of 2 cm / s, two layers of ultrasonically treated silane sol-type primer were sprayed onto the carrier surface. The surface was then left to dry in the air for about 30 minutes. Then, 2, 4, 6, 8, and 10 layers of ultrasonically treated suspension were sprayed onto the carrier respectively. After spraying, hot air was used to assist drying for 10 minutes to form a stable superoleophobic functional layer.

[0021] Figure 1 The transmittance curves of each layer of the high-durability transparent superoleophobic surface functional coating prepared in Example 1 in the visible light range; such as Figure 1 As shown, in terms of optical performance, the transmittance of the 8-layer coating is 86.67%, which is only 6.67% lower than that of the bare glass substrate (93.34%).

[0022] Example 2 This embodiment provides a highly durable, transparent, superoleophobic surface and interface functional coating, the preparation method of which includes the following steps: Step 1: Mix 15 mL of ethanol with 15 mL of isopropanol to obtain a homogeneous mixed solvent; then add 0.15 g of fumed silica, 0.05 g of alumina, 0.02 g of titanium dioxide, and 0.01 g of zirconium oxide to the mixture and stir for 11 h to form a homogeneous dispersion. Step 2: Add 0.1% of perfluorooctyltrichlorosilane, 0.1% of tetraethyl orthosilicate, and 20% of ammonia water by mass to the dispersion prepared in Step 1, and stir for 12 h to form a uniform suspension. Step 3: Dissolve 2.5 g of tetraethyl orthosilicate and 0.5 g of aminopropyltriethoxysilane in 45 mL of ethanol, add 5 mL of deionized water and 1 mL of ammonia, stir at room temperature for 6 h and let stand for 6 h to age, forming a uniform and stable silane sol-type primer. Step 4: Place the transparent quartz in ethanol for ultrasonic cleaning for 20 minutes, then wash it three times each with ethanol and deionized water; after washing, dry it with nitrogen gas. The suspension obtained in step two and the silane sol-type primer obtained in step three were subjected to ultrasonic treatment for 10 min respectively. Using a spray gun at a nitrogen pressure of 0.05 MPa, the spray gun is kept 10 cm vertically from the carrier and moved horizontally at a speed of 2 cm / s to spray one layer of ultrasonically treated silane sol-type primer onto the carrier surface. The surface is then left to dry in the air for about 30 minutes. Then, 20 layers of ultrasonically treated suspension are sprayed. After spraying, the surface is left to dry in the air for about 30 minutes to form a stable superoleophobic functional layer.

[0023] Figure 2The attached bar chart shows the organic solvent stability test results of the high-durability transparent superoleophobic interfacial functional coating prepared in Example 2. Figure 2 As shown, the samples were exposed to common organic solvents such as ethanol, isopropanol, acetone, ethyl acetate, n-hexane, and hexadecane for stability testing. The WCA and OCA values ​​remained above 150° throughout. This phenomenon indicates that the fluorosilane low-energy layer on the coating surface has good chemical inertness to both polar and non-polar solvents, and is not prone to swelling or chemical degradation, demonstrating excellent chemical stability.

[0024] Figure 3 The bar chart shows the sand impact test results of the high-durability transparent superoleophobic surface functional coating prepared in Example 2; as shown. Figure 3 As shown, the sand impact test used free fall to allow sand particles to impact the surface to simulate wind and sand erosion. Even when the cumulative impact weight reached 12 kg, WCA and OCA remained at 154° and 152° respectively, while WSA and OSA were still less than 10°, indicating that the coating has strong resistance to particle impact.

[0025] Example 3 This embodiment provides a highly durable, transparent, superoleophobic surface and interface functional coating, the preparation method of which includes the following steps: Step 1: Mix 13 mL of ethanol with 13 mL of isopropanol to obtain a homogeneous mixed solvent; then add 0.12 g of fumed silica, 0.10 g of alumina, 0.01 g of titanium dioxide, and 0.02 g of zirconium oxide to the mixture and stir for 12 h to form a homogeneous dispersion. Step 2: Add 1% by mass of perfluorooctyltrichlorosilane, 0.1% by mass of tetraethyl orthosilicate and 20% by mass of ammonia water to the dispersion prepared in Step 1, and stir for 10-12 h to form a uniform suspension. Step 3: Dissolve 10 g of tetraethyl orthosilicate and 0.5 g of aminopropyltriethoxysilane in 45 mL of ethanol, add 5 mL of deionized water and 1 mL of ammonia, stir at room temperature for 6 h and let stand for 24 h to form a uniform and stable silane sol primer. Step 4: Place the transparent ceramic in ethanol for ultrasonic cleaning for 10 minutes, then wash it three times each with ethanol and deionized water; after washing, dry it with nitrogen gas. The suspension obtained in step two and the silane sol-type primer obtained in step three were subjected to ultrasonic treatment for 20 min respectively. Five layers of ultrasonically treated silane sol-type primer were sprayed onto the carrier surface at a vertical distance of 30 cm and a horizontal speed of 2 cm / s under a nitrogen pressure of 0.5 MPa. The primer was dried with hot air for 5 minutes. Then, 2, 4, 6, 8 and 10 layers of ultrasonically treated suspension were sprayed onto the carrier respectively. After spraying, the primer was dried with hot air for 5 minutes to form a stable superoleophobic functional layer.

[0026] Figure 4 The graph shows the water contact angle (WCA), water roll-off angle (WSA), oil contact angle (OCA), and oil roll-off angle (OSA) data of the high-durability transparent superoleophobic surface functional coating prepared in Example 3 under different coating numbers; as shown. Figure 4 As shown, with the increase of the number of coating layers, the water contact angle (WCA) and oil contact angle (OCA) gradually increase, while the water slip angle (WSA) and oil slip angle (OSA) decrease significantly. The optimal dual-repellent state is reached with 8 layers (WCA = 162 ± 2°, WSA = 2 ± 0.3°, OCA = 158 ± 1°, OSA = 3 ± 0.5°). At this point, the droplet is in a low-contact-area composite gas / solid interface (Cassie–Baxter state) on the surface, thus achieving the characteristics of low adhesion and easy roll-off.

[0027] Example 4 This embodiment provides a highly durable, transparent, superoleophobic surface and interface functional coating, the preparation method of which includes the following steps: Step 1: Mix 13 mL of ethanol with 15 mL of isopropanol to obtain a homogeneous mixed solvent; then add 0.15 g of fumed silica, 0.05 g of alumina, 0.02 g of titanium dioxide, and 0.02 g of zirconium oxide to the mixture and stir for 12 h to form a homogeneous dispersion. Step 2: Add 0.8% of perfluorooctyltrichlorosilane, 0.1% of tetraethyl orthosilicate, and 20% of ammonia water by mass to the dispersion prepared in Step 1, and stir for 10-12 h to form a uniform suspension. Step 3: Dissolve 8 g of tetraethyl orthosilicate and 0.5 g of aminopropyltriethoxysilane in 45 mL of ethanol, add 5 mL of deionized water and 1 mL of ammonia, stir at room temperature for 1 h and let stand for 6 h to age, forming a uniform and stable silane sol primer. Step 4: Place the transparent glass in ethanol for ultrasonic cleaning for 15 minutes, then wash it three times each with ethanol and deionized water; after washing, dry it with nitrogen gas. The suspension obtained in step two and the silane sol-type primer obtained in step three were subjected to ultrasonic treatment for 30 min respectively. Using a spray gun at a nitrogen pressure of 0.1 MPa, the spray gun is kept 10 cm vertically from the carrier and moved at a horizontal speed of 2 cm / s to spray three layers of ultrasonically treated silane sol-type primer onto the carrier surface. The primer is dried with hot air for 8 minutes. Then, 15 layers of ultrasonically treated suspension are sprayed. After spraying, the primer is dried with hot air for 8 minutes to form a stable superoleophobic functional layer.

[0028] Figure 5 Chemical stability testing of the high-durability transparent superoleophobic surface functional coating prepared in Example 4; such as Figure 5 As shown, in terms of chemical stability, the coatings were immersed in 2 M HCl, 2 M NaOH and 2 M NaCl solutions respectively. The results showed that WCA and OCA maintained a range of 153-156°, while WSA and OSA were in the range of 2-4°, indicating that the coatings have excellent resistance to acid, alkali and high salt environments.

[0029] Example 5 This embodiment provides a highly durable, transparent, superoleophobic surface and interface functional coating, the preparation method of which includes the following steps: Step 1: Mix 15 mL of ethanol with 15 mL of isopropanol to obtain a homogeneous mixed solvent; then add 0.10 g of fumed silica, 0.10 g of alumina, 0.03 g of titanium dioxide, and 0.02 g of zirconium oxide to the mixture and stir for 11 h to form a homogeneous dispersion. Step 2: Add 0.2% of perfluorooctyltrichlorosilane, 0.1% of tetraethyl orthosilicate, and 20% of ammonia water by mass to the dispersion prepared in Step 1, and stir for 10-12 h to form a uniform suspension. Step 3: Dissolve 6 g of tetraethyl orthosilicate and 0.5 g of aminopropyltriethoxysilane in 45 mL of ethanol, add 5 mL of deionized water and 1 mL of ammonia, stir at room temperature for 3 h and let stand for 18 h to form a uniform and stable silane sol primer. Step 4: Place the transparent glass in ethanol for ultrasonic cleaning for 10 minutes, then wash it three times each with ethanol and deionized water; after washing, dry it with nitrogen gas. The suspension obtained in step two and the silane sol-type primer obtained in step three were subjected to ultrasonic treatment for 10–30 min respectively. Using a spray gun at a nitrogen pressure of 0.5 MPa, the spray gun is kept 30 cm vertically from the carrier and moved horizontally at a speed of 2 cm / s to spray four layers of ultrasonically treated silane sol-type primer onto the carrier surface. The surface is then left to dry in the air for about 30 minutes. Two more layers of ultrasonically treated suspension are then sprayed. After spraying, the surface is left to dry in the air for about 30 minutes to form a stable superoleophobic functional layer.

[0030] Figure 6 Experiments on the temperature tolerance of the high-durability transparent superoleophobic surface functional coating prepared in Example 5 are as follows: Figure 6 As shown, in extreme temperature experiments, low temperature ( At 30 °C and medium temperature (60 °C), the coating properties showed almost no significant change. After continuous treatment at high temperature (150 °C) for 20 h, the WCA decreased to 150 °C and the OCA decreased to 138 °C, indicating that the coating properties may be slightly degraded at high temperatures due to partial pyrolysis or migration of fluoroalkyl chains. This ensures the coating's tolerance at different temperatures.

[0031] Example 6 This embodiment provides a highly durable, transparent, superoleophobic surface and interface functional coating, the preparation method of which includes the following steps: Step 1: Mix 10 mL of ethanol with 15 mL of isopropanol to obtain a homogeneous mixed solvent; then add 0.15 g of fumed silica, 0.08 g of alumina, 0.05 g of titanium dioxide, and 0.05 g of zirconium oxide to the mixture and stir for 10 h to form a homogeneous dispersion. Step 2: Add 0.8% of perfluorooctyltrichlorosilane, 0.1% of tetraethyl orthosilicate, and 20% of ammonia water by mass to the dispersion prepared in Step 1, and stir for 10-12 h to form a uniform suspension. Step 3: Dissolve 4 g of tetraethyl orthosilicate and 0.5 g of aminopropyltriethoxysilane in 45 mL of ethanol, add 5 mL of deionized water and 1 mL of ammonia, stir at room temperature for 5 h and let stand for 20 h to form a uniform and stable silane sol primer. Step 4: Place the transparent glass in ethanol for ultrasonic cleaning for 20 minutes, then wash it three times each with ethanol and deionized water; after washing, dry it with nitrogen gas. The suspension obtained in step two and the silane sol-type primer obtained in step three were subjected to ultrasonic treatment for 10–30 min respectively. Using a spray gun at a nitrogen pressure of 0.3 MPa, the spray gun is kept 15 cm vertically from the carrier and moved horizontally at a speed of 2 cm / s to spray three layers of ultrasonically treated silane sol-type primer onto the carrier surface. Hot air is used to assist drying for 10 minutes, followed by spraying five layers of ultrasonically treated suspension. After spraying, the surface is left to dry in the air for about 30 minutes to form a stable superoleophobic functional layer.

[0032] The above are preferred embodiments of this application, but not all embodiments, and should not be used to limit the scope of protection of this application. Therefore, all equivalent changes made to the products, methods and principles of this application should be covered within the scope of protection of this application.

Claims

1. A method for preparing a highly durable, transparent, superoleophobic coating, characterized in that, Includes the following steps: Step 1: Mix 10-15 mL of ethanol with 10-15 mL of isopropanol to obtain a homogeneous mixed solvent; then add 0.10-0.15 g of fumed silica, 0.05-0.10 g of alumina, 0.01-0.05 g of titanium dioxide, and 0.01-0.05 g of zirconium oxide to the mixture and stir to form a homogeneous dispersion. Step 2: Add 0.1-1% of perfluorooctyltrichlorosilane, 0.1% of tetraethyl orthosilicate, and 20% of ammonia water by mass to the dispersion prepared in Step 1, and stir to form a uniform suspension. Step 3: Dissolve 2.5–10 g of tetraethyl orthosilicate and 0.5 g of aminopropyltriethoxysilane in 45 mL of ethanol, add 5 mL of deionized water and 1 mL of ammonia, stir at room temperature for 1–6 h and let stand for 6–24 h to form a uniform and stable silane sol-type primer. Step 4: Apply 1 to 5 layers of silane sol-type primer obtained in Step 3 to the carrier surface using a spray gun. After drying, apply 1 to 20 layers of the suspension obtained in Step 2. After spraying, dry to form a super oleophobic functional layer.

2. The method for preparing a highly durable, transparent, superoleophobic coating according to claim 1, characterized in that, The mass concentration of the ammonia solution mentioned in steps one and two is 25 wt%.

3. The method for preparing a highly durable, transparent, superoleophobic coating according to claim 1, characterized in that, The stirring time described in steps one and two is 10 to 12 hours.

4. The method for preparing a highly durable, transparent, superoleophobic coating according to claim 1, characterized in that, The carrier mentioned in step four includes transparent glass, quartz, or ceramic.

5. The method for preparing a highly durable, transparent, superoleophobic coating according to claim 1 or 4, characterized in that, Before spraying the silane sol-type primer, the carrier described in step 1 is placed in ethanol for ultrasonic cleaning for 10-20 minutes, and then washed three times each with ethanol and deionized water; after washing, it is dried with nitrogen.

6. The method for preparing a highly durable, transparent, superoleophobic coating according to claim 1, characterized in that, In step four, the suspension obtained in step two and the silane sol-type primer obtained in step three are subjected to ultrasonic treatment for 10 to 30 minutes before spraying.

7. The method for preparing a highly durable, transparent, superoleophobic coating according to claim 1, characterized in that, During the spraying process described in step four, the spray gun pressure is 0.05–0.5 MPa, the spray gun maintains a vertical distance of 10–30 cm from the carrier, and moves at a horizontal speed of 2 cm / s.

8. The method for preparing a highly durable, transparent, superoleophobic coating according to claim 1, characterized in that, Nitrogen-assisted atomization spraying is used when spraying the silane sol-type primer and the super oleophobic functional layer as described in step four.

9. The method for preparing a highly durable, transparent, superoleophobic coating according to claim 1, characterized in that, The drying process described in step four involves placing the object in the air and allowing it to dry for approximately 30 minutes, or using hot air to assist in drying for 5 to 10 minutes.

10. A highly durable, transparent, superoleophobic coating prepared by the method according to any one of claims 1 to 9.

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