Preparation method of transparent wear-resistant super-hydrophilic lubricating oil self-cleaning coating
By preparing a superhydrophilic self-cleaning coating on the surface of a transparent material, and utilizing the chemical cross-linking of surfactants and nanofillers with inorganic binders to form a dense coating, the problem of easy damage of existing coatings is solved, and the wear resistance and self-cleaning performance of transparent materials are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- XINJIANG UNIVERSITY
- Filing Date
- 2026-03-31
- Publication Date
- 2026-06-02
AI Technical Summary
Existing hydrophobic and oleophobic coatings on the surface of transparent materials are easily damaged under mechanical action, resulting in insufficient durability and difficulty in meeting the requirements for long-term service, thus limiting their commercial application.
The pH of the solution was adjusted to 8.0-10.5 using ammonia water. By adding hollow nanoparticles, nanotubes and modified aluminum dihydrogen phosphate, a transparent and wear-resistant superhydrophilic self-cleaning coating of lubricating oil was formed. The coating was formed by chemical cross-linking of surfactants and nanofillers and inorganic binders. The self-cleaning performance was achieved by the synergistic effect of the superhydrophilic matrix and hydrophobic sites.
The coating maintains good oleophobic properties under a 500 g load, significantly improving abrasion resistance and durability, and achieving long-lasting self-cleaning effect for transparent materials.
Smart Images
Figure CN122127882A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of biomimetic modification technology of transparent material surfaces, and in particular to a method for preparing a transparent, wear-resistant, super-hydrophilic, self-cleaning coating. Background Technology
[0002] Currently, transparent materials are widely used in key fields such as photovoltaic systems, aerospace, and drones. However, their surfaces are susceptible to the adhesion of oil and dust in actual service environments. Frequent cleaning and maintenance not only significantly increase maintenance costs but may also affect the performance stability and lifespan of equipment. Therefore, developing efficient and durable self-cleaning surface technologies has become a key research direction in this field.
[0003] Existing technologies typically employ a biomimetic lotus leaf effect, grafting low surface energy materials onto material surfaces to reduce oil adhesion. This is combined with micro / nano-scale rough structures to trap air at the solid-liquid interface, forming an air cushion layer that significantly reduces the surface's affinity for oil or water, achieving hydrophobic and oleophobic properties. However, this design strategy suffers from a fundamental contradiction: its excellent liquid-repellent properties highly depend on precise micro / nano structures, but these structures are inherently fragile and easily damaged irreversibly by everyday friction, scratches, or fluid impacts. Structural damage and the loss of low surface energy components lead to the failure of the coating's hydrophobic and oleophobic properties, resulting in severely insufficient coating durability. This makes it difficult for such coatings to meet the stringent requirements for long-term service in practical applications, fundamentally hindering the large-scale commercial application of this type of coating and necessitating further improvements. Summary of the Invention
[0004] The purpose of this invention is to provide a method for preparing a transparent, wear-resistant, super-hydrophilic self-cleaning coating of lubricating oil, so as to solve the above-mentioned problems in the background art.
[0005] To achieve the above objectives, the present invention provides the following technical solution: One of the technical solutions of this invention is to provide a transparent, wear-resistant, super-hydrophilic self-cleaning coating, the raw materials of which, by mass percentage, include: Ammonia 1.0-3.0 wt.%, hollow nanoparticles 0.2-2.0 wt.%, nanotubes 0.2-0.5 wt.%, modified aluminum dihydrogen phosphate 1.0-3.0 wt.%, tetraethyl orthosilicate 0.5-3 wt.%, siloxane 1.0-5.0 wt.%, surfactant 2.0-5.0 wt.%, and solvent.
[0006] This invention adjusts the pH of the solution to 8.0-10.5 by adding ammonia. It also modifies the nanofillers (hollow nanoparticles, nanotubes) by adding siloxanes to achieve hydrophobic and oleophobic properties.
[0007] Preferably, the hollow nanoparticles are hollow silica nanoparticles with a particle size of 30-70 nm.
[0008] Preferably, the mass fraction of the hollow nanoparticles is 0.8-1.6 wt.%, more preferably 1.0 wt.%.
[0009] Preferably, the nanotube is halloysite nanotube with a diameter of 20-50 nm and a length of 1.0-3.0 μm.
[0010] Preferably, the modified aluminum dihydrogen phosphate is copper oxide-modified aluminum dihydrogen phosphate.
[0011] Preferably, the modified aluminum dihydrogen phosphate is prepared by mixing copper oxide and aluminum dihydrogen phosphate in a solution at a mass ratio of 1:5.
[0012] Preferably, the siloxane is one or more of n-octyltriethoxysilane, octamethyltriethoxysilane, and polymethyltriethoxysilane.
[0013] Preferably, the surfactant is one or more of polyethylene glycol, polyethylene glycol methyl ether acrylate, and ethylene glycol dimethacrylate.
[0014] Preferably, the solvent is water and ethanol in a volume ratio of 3:7.
[0015] The second technical solution of the present invention provides a method for preparing the above-mentioned transparent and wear-resistant superhydrophilic self-cleaning coating, comprising the following steps: The ammonia water, hollow nanoparticles, nanotubes, modified aluminum dihydrogen phosphate, tetraethyl orthosilicate, siloxane, surfactant and solvent are mixed to obtain the transparent and wear-resistant superhydrophilic self-cleaning coating.
[0016] Preferably, the mixing temperature is 50°C.
[0017] The third technical solution of this invention provides a method for preparing a transparent, wear-resistant, super-hydrophilic self-cleaning coating, comprising the following steps: The above-mentioned transparent and wear-resistant superhydrophilic self-cleaning coating is applied to the substrate surface and cured to form the transparent and wear-resistant superhydrophilic self-cleaning coating.
[0018] Furthermore, the substrate is glass.
[0019] Furthermore, the substrate includes an activation step before use. The activation method is as follows: the substrate is ultrasonically soaked in ethanol for 30 min, then soaked in a 10% sodium hydroxide solution for 10-30 s, then taken out, rinsed with water, and dried for later use.
[0020] Activating the substrate surface helps remove surface oil and exposes its hydroxyl groups, thus enhancing the adhesion between the coating and the substrate and improving durability.
[0021] Preferably, the coating method is wiping, dipping, spraying, rolling, or scraping.
[0022] The technical principle of this invention is as follows: The preferred surfactant in this invention is a reactive surfactant that cross-links with the -OH-containing raw materials in the coating. In contrast, if sodium alkenyl sulfonate is chosen as the surfactant, some of it will be free in the coating and some will be loaded in the nanofiller. Ultimately, when the coating loses the free surfactant during friction and wear, the surfactant loaded in the internal nanofiller can be released to the surface to replenish the hydrophilicity of the coating, but the total amount released is limited by the loading capacity in the filler, making it difficult to maintain stable hydrophilicity over a long period of time.
[0023] The modified aluminum dihydrogen phosphate is an inorganic binder. Compared with organic composite resin as a binder, its advantage is that the reactive surfactant used can react chemically with the filler surface groups after hydrolysis to form covalent bonds, thereby enabling the coating to maintain stable hydrophilic properties over a long period of time.
[0024] Furthermore, the coating designed in this invention has superior UV aging resistance due to the addition of a more aging-resistant aluminum dihydrogen phosphate inorganic binder.
[0025] The surfactants that are uniformly distributed in the coating endow it with excellent superhydrophilic properties.
[0026] The beneficial technical effects of the present invention are as follows: This invention designs a transparent and wear-resistant superhydrophilic self-cleaning coating for lubricating oil. The hollow nanoparticles and nanotubes in the selected raw materials contain a large number of -OH groups on their surfaces, which can chemically crosslink with tetraethyl orthosilicate and siloxane through dehydration condensation to form a nanocomposite filler, which is then embedded into the superhydrophilic coating, thereby forming superhydrophobic and oleophobic sites on the coating surface.
[0027] Based on the principle of "like dissolves like," the high polarity of the superhydrophilic substrate prevents low-polarity oil droplets from completely wetting and penetrating the micro-nano structures on the coating surface. The physical air cushion formed by the superhydrophobic and oleophobic sites traps air, creating a "solid-air-oil" composite interface that ensures excellent lubrication properties. Unlike traditional superhydrophobic and superoleophobic coatings that rely on their fragile micro-nano structures, the superhydrophilic, highly polar surface of the coating substrate in this invention does not depend on micro-nano structures, thus exhibiting excellent wear resistance.
[0028] When oil droplets come into contact with the surface of this self-cleaning coating, their desorption and sliding behavior stems from the synergistic effect of the hydrophilic matrix and the superhydrophobic and oleophobic sites. The highly polar hydrophilic matrix in the coating acts as a "push" by its inherent thermodynamic repulsion against oily media, while the discretely distributed hydrophobic nanodots on the surface regulate the contact line behavior of the oil droplets through a local pinning effect, forming a weak anchoring effect. The synergy of these two factors causes the oil droplets to exhibit a contracted state, maintaining only a weak and discontinuous interfacial contact with the coating surface. They are actually situated on a composite interface composed of the micro-protrusions of the superhydrophobic and oleophobic sites and trapped air, thus enabling rapid desorption and sliding with an extremely low energy barrier.
[0029] Existing superhydrophobic / superoleophobic coatings typically rely on loose, porous micro / nano structures and the synergistic modification of low surface energy materials, resulting in complex structures and poor mechanical stability, making them prone to failure under external forces during use. In contrast, the superhydrophilic surface of the self-cleaning coating proposed in this invention can be achieved by increasing the density of hydrophilic groups on the surface. Its surface is mainly composed of hydrophilic regions, with a dense and smooth structure, without relying on fragile micro / nano structures. Therefore, compared to traditional superhydrophobic / superoleophobic coatings, the coating of this invention significantly improves wear resistance while maintaining good self-cleaning properties.
[0030] Experimental results show that the coating still has good oleophobic properties after 200 cycles of friction with 0000# steel wool under a 500 g load, demonstrating good durability and wear resistance. Attached Figure Description
[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in 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.
[0032] Figure 1 This is a schematic diagram of the preparation process of the superhydrophilic self-cleaning coating of the present invention.
[0033] Figure 2 This is a comparison of the water and oil contact effects of Sample 1 and Sample 2. A and B represent the water and oil contact effects of Sample 1, respectively, while C and D represent the water and oil contact effects of Sample 2, respectively.
[0034] Figure 3 A comparison of the water contact effects of the coating (A) and blank glass (B) in Example 1.
[0035] Figure 4 The images are SEM images of the coating in Example 1 at different magnifications.
[0036] Figure 5 The water contact angle (A), oil contact angle (B), and oil droplet sliding angle (C) of the coating in Example 1 are given.
[0037] Figure 6 The visible light transmittance of the glass sample with the self-cleaning coating in Example 1 is compared with that of the blank glass.
[0038] Figure 7 This image shows a comparison of how soybean oil slips off the coating and blank glass sample from Example 1. In this image, A represents Example 1, and B represents the blank glass sample.
[0039] Figure 8 This is a comparison of the self-cleaning properties of soybean oil on the coating and blank glass sample surface in Example 1.
[0040] Figure 9 This is an AFM three-dimensional structure diagram of the coating surface of Example 1.
[0041] Figure 10 The image shows the lubricating performance of the coating from Example 1 after 200 cycles of friction with 0000# steel wool under a 500 g load. In the image, A is a photograph of the actual product during the friction treatment, and B is a photograph showing the lubricating effect.
[0042] Figure 11 The image shows the surface morphology of the coating in Example 3 after being rubbed 50 times with 0000# steel wool under a 500 g load.
[0043] Figure 12 This is a surface morphology diagram of the coating in Example 4.
[0044] Figure 13 This is a surface morphology diagram of the coating in Example 5. Detailed Implementation
[0045] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention. It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the present invention.
[0046] Furthermore, regarding the numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Any stated value or intermediate value within a stated range, as well as each smaller range between any other stated value or intermediate value within said range, are also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.
[0047] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. It should be noted that any aspects of this invention not described in detail are conventional practices in the art and are not the focus of this invention.
[0048] The terms “comprising,” “including,” “having,” “containing,” etc., used in this invention are all open-ended terms, meaning that they include but are not limited to.
[0049] The hollow silica nanoparticles used in this invention have a particle size of 30-70 nm. The halloysite nanotubes used have a diameter of 20-50 nm and a length of 1.0-3.0 μm. The modified aluminum dihydrogen phosphate is prepared by adding copper oxide to an aluminum dihydrogen phosphate solution (the solvent is deionized water and anhydrous ethanol in a volume ratio of 3:7), so that the mass ratio of copper oxide to aluminum dihydrogen phosphate is 1:5, thus obtaining modified aluminum dihydrogen phosphate. The deionized water and ethanol mixed solvent used is prepared by mixing deionized water and anhydrous ethanol in a volume ratio of 3:7.
[0050] Unless otherwise specified, room temperature in this invention is calculated as 10-30°C.
[0051] Unless otherwise specified, the mass percentages (wt.%) in this invention are based on the mass ratio of the relevant components in the raw materials.
[0052] All raw materials used in the following embodiments of the present invention are commercially available products.
[0053] Example 1 A method for preparing a transparent, wear-resistant, superhydrophilic self-cleaning coating for lubricating oil, comprising the following steps: (1) 2.0 wt.% polyethylene glycol methyl ether acrylate was added to 50 mL of deionized water and ethanol mixed solvent heated to 50℃ and stirred for 30 min to obtain solution 1; 1.0 wt.% hollow silica nanoparticles, 0.2 wt.% halloysite nanotubes and 2.0 wt.% ammonia were added dropwise to 50 mL of deionized water and ethanol mixed solvent heated to 50℃ and stirred at room temperature for 10 min, then 1.0 wt.% tetraethyl orthosilicate and 2.0 wt.% n-octyltriethoxysilane were added dropwise and stirred at 50℃ for 60 min to obtain solution 2; solution 1 and solution 2 were mixed and 2.0 wt.% modified aluminum dihydrogen phosphate was added and stirred at 50℃ for 60 min to obtain coating.
[0054] (2) Soak the glass in anhydrous ethanol for 30 min by ultrasound, then soak the glass in a 10% sodium hydroxide solution for 20 s, rinse it with distilled water, and dry it for later use.
[0055] (3) The coating obtained in step (1) is applied to the glass surface treated in step (2) by spraying. After being placed at room temperature for 10 minutes, a transparent and wear-resistant super-hydrophilic lubricating oil self-cleaning coating is formed, and a glass sample with a self-cleaning coating is obtained.
[0056] Figure 1 This is a schematic diagram of the preparation process of the superhydrophilic self-cleaning coating of the present invention.
[0057] Example 2 The only difference from Example 1 is that the addition of n-octyltriethoxysilane is omitted (tetraethyl orthosilicate is a chemical crosslinking agent for the coating of the present invention and cannot be omitted, as it makes the crosslinking effect of the nanofiller stronger and improves the density of the coating).
[0058] Effect verification Sample 1 and Sample 2 were prepared according to the following method (compared to Sample 1, only n-octyltriethoxysilane was omitted in the preparation process): In a 50 mL mixture of deionized water and ethanol heated to 50 °C, 1.0 wt.% hollow silica nanoparticles, 0.2 wt.% halloysite nanotubes, and 2.0 wt.% ammonia were added dropwise. The mixture was stirred at room temperature for 10 min. Then, 1.0 wt.% tetraethyl orthosilicate and 2.0 wt.% n-octyltriethoxysilane were added dropwise. The mixture was stirred at 50 °C for 60 min. Next, 2.0 wt.% modified aluminum dihydrogen phosphate was added. The mixture was stirred at 50 °C for 60 min. Finally, the mixture was dried to constant weight. The resulting powder was sample 1.
[0059] In a 50 mL mixture of deionized water and ethanol heated to 50 °C, 1.0 wt.% hollow silica nanoparticles, 0.2 wt.% halloysite nanotubes, and 2.0 wt.% ammonia were added dropwise. The mixture was stirred at room temperature for 10 min, then 1.0 wt.% tetraethyl orthosilicate was added dropwise. The mixture was stirred at 50 °C for 60 min, then 2.0 wt.% modified aluminum dihydrogen phosphate was added. The mixture was stirred at 50 °C for 60 min, and finally dried to constant weight. The resulting powder was sample 2.
[0060] The water and oil contact effects were tested by dripping dyed water droplets and soybean oil onto the surfaces of Sample 1 and Sample 2, and compared with the corresponding effects on glass.
[0061] Figure 2This is a comparison of the water and oil contact effects of Sample 1 and Sample 2. A and B represent the water and oil contact effects of Sample 1, respectively, while C and D represent the water and oil contact effects of Sample 2, respectively.
[0062] The test results show that the nanofiller particles of Sample 1, after being grafted with n-octyltriethoxysilane, exhibit good hydrophobic and oleophobic effects. Water droplets and soybean oil form spherical shapes on their surface (see...). Figure 2 (A, B); In contrast, sample 2, which was not modified, exhibited good wettability on the particle surface (see A, B); Figure 2 (C, D).
[0063] Adding excessive amounts of n-octyltriethoxysilane can cause the coating to change from hydrophilic to hydrophobic, ultimately affecting the product's performance. However, by adding a small amount of n-octyltriethoxysilane, the coating prepared by this invention is both superhydrophilic and oleophilic due to insufficient grafting and the presence of a large number of hydrophilic groups on the surface.
[0064] Figure 3 This is a comparison of the water contact effects of the coating (A) and blank glass (B) in Example 1. Figure 3 As can be seen from A and B, compared to the blank glass sample, the water droplets on the coating surface can also spread completely.
[0065] Figure 4 The images show SEM images of the coating from Example 1 at different magnifications. Figure 4 As shown, the coating contains a superhydrophilic matrix and surface-embedded nanocomposite fillers.
[0066] Figure 5 The figures show the water contact angle (A), oil contact angle (B), and oil droplet sliding angle (C) of the coating in Example 1. It can be seen that the water contact angle of the coating is 3.7°, the oil contact angle is 58.5°, and the sliding angle of the oil droplet (soybean oil) is 29.7°.
[0067] In Example 2, the water contact angle of the coating surface was 3.8°, and the soybean oil contact angle was 32.1°, exhibiting superhydrophilic and oleophilic properties, preventing oil droplets from sliding off the coating surface. Because the coating in Example 2 did not introduce n-octyltriethoxysilane or similar substances to hydrophobically modify the silica nanoparticles and halloysite nanotubes, the coating surface did not form superhydrophobic and oleophobic sites composed of these two components, resulting in oil droplets being unable to slide off the coating surface quickly.
[0068] Figure 6 The visible light transmittance of the glass sample with the self-cleaning coating in Example 1 is compared with that of the blank glass.
[0069] In the figure, Coated represents Example 1, and Bare represents blank glass.
[0070] like Figure 6As shown, due to the introduction of hollow silica nanoparticles into the coating of Example 1, the transmittance of the coating in visible light at a wavelength of 550 nm is further improved compared with the blank glass sample, reaching 92.1%.
[0071] Figure 7 This image shows a comparison of how soybean oil slips off the coating and blank glass sample from Example 1. In this image, A represents Example 1, and B represents the blank glass sample.
[0072] Figure 8 This is a comparison of the self-cleaning properties of soybean oil on the coating and blank glass sample surface in Example 1.
[0073] like Figure 7 As shown in Figure 8, the oil stains on the surface of the coated sample in Example 1 quickly slid off, while the untreated sample surface showed a large number of stains.
[0074] Figure 9 This is an AFM three-dimensional structure diagram of the coating surface in Example 1. Compared to the fragile porous micro / nano structure of the superhydrophobic and oleophobic coating surface, the coating surface of the present invention is dense and smooth, with a roughness R... q =20.8 nm.
[0075] Figure 10 The image shows the lubricating performance of the coating from Example 1 after 200 cycles of friction with 0000# steel wool under a 500 g load. In the image, A is a photograph of the actual product during the friction treatment, and B is a photograph showing the lubricating effect.
[0076] Depend on Figure 10 It can be seen that the strength of the coating is significantly improved, and it still has good lubricating properties after 200 cycles of friction with 0000# steel wool under a 500 g load.
[0077] Example 3 The only difference from Example 1 is that the amount of halloysite nanotubes added was changed from 0.2 wt.% to 0.1 wt.%.
[0078] Figure 11 The image shows the surface morphology of the coating in Example 3 after being rubbed 50 times with 0000# steel wool under a 500 g load.
[0079] The results showed that the water contact angle of the coating surface in Example 3 was 4.1°, and the soybean oil contact angle was 29.7°, exhibiting superhydrophilic and oleophilic properties. Because the halloysite nanotube content in the coating of Example 3 was reduced to 0.1 wt.%, the coating's abrasion resistance was significantly reduced; after 50 cycles of abrasion with 500 g load and 0000# steel wool, large-area peeling occurred (see...). Figure 11 It loses its superhydrophilicity and lubricating properties.
[0080] Example 4 The only difference from Example 1 is that the addition of hollow silica nanoparticles is omitted.
[0081] The results showed that the coating surface of Example 4 was smooth and exhibited a denser microstructure compared to Example 1. A small amount of halloysite nanotubes were exposed on the coating surface, and no composite nanofiller formed by hydrophobically modified silica nanoparticles and halloysite nanotubes was observed (see Example 4). Figure 12 The coating surface has a water contact angle of 4.3°, exhibiting superhydrophilic properties, but not lubricating properties.
[0082] Figure 12 This is a surface morphology diagram of the coating in Example 4.
[0083] Example 5 The only difference from Example 1 is that the amount of hollow silica nanoparticles added was changed from 1.0 wt.% to 0.5 wt.%.
[0084] The results showed that the water contact angle of the coating surface in Example 5 was 4.3°. Due to the reduction of the hollow silica content to 0.5 wt.%, the coating surface was relatively more porous (see...). Figure 13 This leads to increased adhesion to oil stains and increased resistance to oil droplet sliding, making it impossible to achieve the lubricating properties of oil.
[0085] Figure 13 This is a surface morphology diagram of the coating in Example 5.
[0086] Example 6 The only difference from Example 1 is that the modified aluminum dihydrogen phosphate is replaced with an equal mass of unmodified conventional aluminum dihydrogen phosphate (the resulting product is denoted as ADP) or lithium polysilicate (the resulting product is denoted as LSS).
[0087] The results showed that the LSS sample with lithium polysilicate as the binder had a smoother surface; while the ADP sample using unmodified aluminum dihydrogen phosphate as the binder had increased surface roughness. However, in comparison, the surface morphology of the product of Example 1 modified with copper oxide was significantly improved, with a smoother surface than the LSS and ADP samples, and denser interparticle bonding with virtually no micropores. This indicates that the copper oxide modification operation specified in this invention effectively optimizes the microstructure of the coating, and the use of copper oxide-modified aluminum dihydrogen phosphate as the binder significantly improves the durability of the coating.
[0088] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims
1. A transparent, wear-resistant, super-hydrophilic, self-cleaning coating, characterized in that, Raw materials, by weight percentage, include: Ammonia 1.0-3.0 wt.%, hollow nanoparticles 0.2-2.0 wt.%, nanotubes 0.2-0.5 wt.%, modified aluminum dihydrogen phosphate 1.0-3.0 wt.%, tetraethyl orthosilicate 0.5-3 wt.%, siloxane 1.0-5.0 wt.%, surfactant 2.0-5.0 wt.%, and solvent.
2. The transparent, wear-resistant, super-hydrophilic, self-cleaning coating according to claim 1, characterized in that, The hollow nanoparticles are hollow silica nanoparticles with a particle size of 30-70 nm.
3. The transparent, wear-resistant, super-hydrophilic, self-cleaning coating according to claim 1, characterized in that, The nanotubes are halloysite nanotubes with a diameter of 20-50 nm and a length of 1.0-3.0 μm.
4. The transparent, wear-resistant, super-hydrophilic, self-cleaning coating according to claim 1, characterized in that, The modified aluminum dihydrogen phosphate is copper oxide-modified aluminum dihydrogen phosphate.
5. The transparent, wear-resistant, super-hydrophilic, self-cleaning coating according to claim 1, characterized in that, The siloxane is one or more of n-octyltriethoxysilane, octamethyltriethoxysilane, and polymethyltriethoxysilane.
6. The transparent, wear-resistant, super-hydrophilic, self-cleaning coating according to claim 1, characterized in that, The surfactant is one or more of polyethylene glycol, polyethylene glycol methyl ether acrylate, and ethylene glycol dimethacrylate.
7. The transparent, wear-resistant, super-hydrophilic, self-cleaning coating according to claim 1, characterized in that, The solvent is water and ethanol in a volume ratio of 3:
7.
8. A method for preparing a transparent, wear-resistant, super-hydrophilic self-cleaning coating according to any one of claims 1-7, characterized in that, Includes the following steps: The ammonia water, hollow nanoparticles, nanotubes, modified aluminum dihydrogen phosphate, tetraethyl orthosilicate, siloxane, surfactant and solvent are mixed to obtain the transparent and wear-resistant superhydrophilic self-cleaning coating.
9. The preparation method according to claim 8, characterized in that, The mixing temperature is 50°C.
10. A method for preparing a transparent, wear-resistant, superhydrophilic self-cleaning coating of lubricating oil, characterized in that, Includes the following steps: The transparent, wear-resistant, super-hydrophilic self-cleaning coating of any one of claims 1-7 is applied to the surface of a substrate and cured to form the transparent, wear-resistant, super-hydrophilic self-cleaning coating.