Sun-protecting-hydrophobic self-cleaning glass and method for producing the same

Abstract

The application relates to the technical field of functional glass preparation, in particular to a sunscreen-hydrophobic self-cleaning glass and a preparation method thereof, which comprises a common float glass substrate, a first coating layer and a second coating layer, the first coating layer is arranged on the surface of the common float glass substrate, and the second coating layer is arranged on the surface of the first coating layer; the common float glass substrate is treated by an activation liquid, the activation liquid is prepared by mixing concentrated sulfuric acid and 30% hydrogen peroxide at a volume ratio of 3:1; the first coating layer comprises, by weight, 30 parts of KH-550 organic silicon resin, 8 parts of nano titanium dioxide with a particle size of 20 nm, 5 parts of nano zinc oxide with a particle size of 30 nm, 2 parts of polyglycerol fatty acid ester, 2 parts of epoxy soybean oil, and 20 parts of ethyl acetate. Through the substrate activation pretreatment, the double-coating layer structure design and the step-by-step curing process, the problems that the existing functional glass has single function, weak coating layer combination, uneven component dispersion, poor weather resistance and the like are effectively solved, and the application has outstanding practical value.

Description

Technical Field

[0001] This invention relates to the field of functional glass preparation technology, specifically to a sun-proof, hydrophobic, self-cleaning glass and its preparation method. Background Technology

[0002] As a basic building material and functional component, glass is widely used in many fields such as building curtain walls, transportation vehicles, and photovoltaic covers. With the expansion of application scenarios, the market has placed higher demands on the multifunctional integration of glass. Ordinary glass only has basic light transmission and protection functions, and cannot meet the needs of sun protection, heat insulation, and surface cleaning in outdoor use scenarios.

[0003] Most existing functional glass is designed for a single function. Sun-protective glass often achieves its heat insulation effect by adding light-blocking components, but it generally suffers from weak adhesion between the coating and the substrate, and is prone to peeling and aging after long-term use. It also cannot meet the need for surface self-cleaning. Hydrophobic self-cleaning glass mostly relies on a low surface energy coating to achieve its hydrophobic effect, but it lacks effective sun-protective and heat-insulating components, making it difficult to adapt to strong sunlight exposure scenarios.

[0004] Currently, glass products that combine sun protection and self-cleaning functions generally suffer from defects such as imperfect substrate pretreatment processes, insufficient coating bonding strength, and uneven dispersion of functional components, resulting in poor coating stability.

[0005] Meanwhile, most products use a single-layer coating design, where the sun-protective and hydrophobic components interfere with each other, making it difficult for them to work synergistically, thus limiting the product's weather resistance and lifespan. Existing manufacturing processes are mostly one-step curing processes, which cannot effectively release the internal stress of the coating, further exacerbating the problems of coating cracking and peeling. Summary of the Invention

[0006] The primary objective of this invention is to provide a sun-proof, hydrophobic, self-cleaning glass and its preparation method.

[0007] A further objective of this invention is to provide a sun-protective, hydrophobic, self-cleaning glass, comprising a conventional float glass substrate, a first coating, and a second coating. The first coating is disposed on the surface of the conventional float glass substrate, and the second coating is disposed on the surface of the first coating. The conventional float glass substrate is treated with an activation solution, which is a mixture of concentrated sulfuric acid and 30% hydrogen peroxide in a volume ratio of 3:1. The first coating comprises, by weight, 30 parts of KH-550 silicone resin, 8 parts of 20nm nano-titanium dioxide, 5 parts of 30nm nano-zinc oxide, 2 parts of polyglycerol fatty acid ester, 2 parts of epoxidized soybean oil, and 20 parts of ethyl acetate. The second coating comprises, by weight, 15 parts of KH-560 silanol-containing silicone resin, 3 parts of modifier, 4 parts of 50nm nano-silica powder, 0.3 parts of dibutyltin dilaurate, and 18 parts of mixed solvent, which is a mixture of butyl acetate and n-butanol in a weight ratio of 3:1.

[0008] Preferably, the first coating further comprises 5 parts by weight of hydrogenated rosin, and the second coating further comprises 2 parts by weight of a mixture of hydrogenated rosin and sebacic acid in a weight ratio of 2:1.

[0009] Preferably, the modifier is perfluorooctyltrichlorosilane or dodecafluoroheptyl methacrylate; the first coating consists of 30-60 parts by weight of KH-550 silicone resin, 8-22 parts by weight of nano titanium dioxide, 5-13 parts by weight of nano zinc oxide, 2-6 parts by weight of polyglycerol fatty acid ester, 2-6 parts by weight of epoxidized soybean oil, and 20-35 parts by weight of ethyl acetate; the second coating consists of 15-28 parts by weight of KH-560 silicone resin containing silanol, 3-7 parts by weight of modifier, 4-10 parts by weight of nano-silica powder, 0.3-1.0 parts by weight of dibutyltin dilaurate, and 18-32 parts by weight of mixed solvent.

[0010] Preferably, the thickness of the ordinary float glass substrate is 5 mm, the thickness of the first coating is 18-25 μm, and the thickness of the second coating is 10-15 μm.

[0011] A method for preparing a sun-protective, hydrophobic, self-cleaning glass comprises sequentially performing substrate pretreatment, first coating preparation, second coating preparation, and stepwise curing; the substrate pretreatment includes ultrasonic cleaning, immersion in an activating solution, rinsing with deionized water, and nitrogen drying; the first coating preparation involves mixing the first coating material of claim 1 into a slurry, applying it using a scraper coating method, and then drying it; the second coating preparation involves mixing the second coating material of claim 1 into a slurry, applying it, and then drying it; the stepwise curing involves staged heating and heat preservation followed by natural cooling to 25°C.

[0012] Preferably, the substrate pretreatment involves ultrasonically cleaning ordinary float glass sequentially with deionized water and anhydrous ethanol, immersing it in an activation solution under 0°C ice bath conditions, rinsing it with deionized water until neutral, and drying it with nitrogen gas flow.

[0013] Preferably, the first coating slurry is prepared by mixing and stirring KH-550 silicone resin with ethyl acetate, adding nano-titanium dioxide and nano-zinc oxide and stirring, and adding polyglycerol fatty acid ester and epoxidized soybean oil and stirring.

[0014] Preferably, the second coating slurry is prepared by heating and stirring KH-560 hydroxyl-containing organosilicon resin with a mixed solvent, adding nano-silicon powder for ultrasonic dispersion, adding a modifier and dibutyltin dilaurate, heating and stirring.

[0015] Preferably, the ultrasonic treatment power is 300W, the frequency is 40kHz, and the stirring speed is 500-700r / min.

[0016] Preferably, the step-curing heating rate is 4-5℃ / min, with the first stage heating to 120-130℃ and holding at that temperature, and the second stage heating to 160-180℃ and holding at that temperature.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention effectively solves the problems of single function, weak coating adhesion, uneven component dispersion, and poor weather resistance of existing functional glass through substrate activation pretreatment, double coating structure design and step-by-step curing process, and has outstanding practical value. This invention performs special activation treatment on glass substrate, which significantly improves the surface activity of the substrate, enhances the bonding strength between the coating and the substrate, prevents coating peeling, and extends the service life of the product.

[0018] 2. The present invention adopts a structure in which the sun-protective coating and the hydrophobic self-cleaning coating are layered, so that the two types of functional components can play their roles independently, avoid mutual interference, and achieve functional synergy; the present invention selects a suitable raw material system, so that the functional components can be evenly dispersed, the coating structure is dense and stable, and the performance stability of the product is guaranteed during use.

[0019] 3. The step-by-step curing process of this invention can effectively release the internal stress of the coating, optimize the microstructure of the coating, and improve the mechanical strength and aging resistance of the coating; the hydrophobic coating enables the glass surface to have stable low surface energy characteristics, and the sun-proof coating can effectively achieve light control. The combination of the two enables the product to have multiple practical functions at the same time.

[0020] 4. The preparation process of this invention is highly controllable, the raw materials are all conventional commercial products, the preparation process can be repeated, and it is suitable for industrial production; the overall structure of the product is stable, and it can maintain a good working condition without additional maintenance, and can be adapted to a variety of complex outdoor use scenarios. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.

[0022] The following examples all use 5mm thick ordinary float glass as a substrate. The experiments were carried out according to a unified route of substrate pretreatment, sunscreen coating preparation, hydrophobic self-cleaning coating preparation, and step-by-step curing. All raw materials used were commercially available standard specifications, including nano titanium dioxide with a particle size of 20nm, nano zinc oxide with a particle size of 30nm, nano silicon micropowder with a particle size of 50nm, organosilicon resin of type KH-550, and silicone hydroxyl-containing organosilicon resin of type KH-560, to ensure that the preparation process can be repeated. Example

[0023] Raw material preparation: The substrate pretreatment agent includes: an activation solution prepared by a volume ratio of concentrated sulfuric acid and 30% hydrogen peroxide of 3:1, deionized water, and anhydrous ethanol; the sunscreen coating raw materials include: 30 parts of silicone resin, 8 parts of nano titanium dioxide, 5 parts of nano zinc oxide, 2 parts of dispersant polyglycerol fatty acid ester, 2 parts of plasticizer epoxidized soybean oil, and 20 parts of solvent ethyl acetate; the hydrophobic self-cleaning coating raw materials include: 15 parts of silicone resin containing silanol groups, 3 parts of perfluorooctyl trichlorosilane, 4 parts of nano-silica powder, 0.3 parts of catalyst dibutyltin dilaurate, and 18 parts of mixed solvent prepared by a weight ratio of butyl acetate and n-butanol of 3:1.

[0024] Preparation steps: Substrate pretreatment: Cut the float glass to 100mm×100mm size, first ultrasonically clean it with deionized water for 15min, then ultrasonically clean it with anhydrous ethanol for 15min. The ultrasonic power is 300W and the frequency is 40kHz. After cleaning, air dry it and immerse it in the activation solution. Soak it in an ice bath at 0℃ for 60min while mechanically stirring at a speed of 200r / min. After soaking, take it out, rinse it with deionized water until pH=7, blow it dry with a nitrogen flow of 5L / min, and place it in a clean environment for later use.

[0025] Sunscreen coating preparation: Organosilicon resin and ethyl acetate were added to a glass reaction vessel and mechanically stirred at 25°C for 10 min until uniformly mixed. Nano titanium dioxide and nano zinc oxide were added sequentially and stirred at 500 r / min for 30 min. Then, dispersant and plasticizer were added and stirred for another 20 min until the system was homogenized to obtain sunscreen coating slurry. The slurry was coated onto the pretreated substrate surface using a doctor blade coating method, and the coating thickness was controlled to be 18 μm. The coating was then dried at room temperature of 25°C for 30 min.

[0026] Preparation of hydrophobic self-cleaning coating: Silicone hydroxyl-containing organosilicon resin and mixed solvent were added to a polytetrafluoroethylene reactor, heated to 60℃ and stirred for 10 min, nano-silicon powder was added, and ultrasonic dispersion was performed at 300W power for 15 min at an ultrasonic frequency of 40kHz. Perfluorooctyltrichlorosilane and catalyst were then added, and the mixture was heated to 80℃ and stirred for 60 min to obtain a hydrophobic slurry. The hydrophobic slurry was uniformly coated on the surface of the sunscreen coating, and the coating thickness was controlled to be 10μm. The coating was then allowed to dry at room temperature of 25℃ for 20 min.

[0027] Step-by-step curing: Place the double-coated glass in an electric heating oven and heat it to 120°C at a heating rate of 5°C / min, and hold it at that temperature for 60 minutes; then continue to heat it to 160°C, hold it at that temperature for 40 minutes, and let it cool naturally to 25°C to obtain the target product. Example

[0028] Based on Example 1, the sun protection performance of the product was improved by adjusting the ratio of nano-sunscreen agent to binder and optimizing the dispersion process. The remaining preparation conditions remained the same as in Example 1. The specific adjustments are as follows: The raw materials for the sunscreen coating were adjusted to: 35 parts of silicone resin, 12 parts of nano titanium dioxide, 8 parts of nano zinc oxide, 3 parts of dispersant, 3 parts of plasticizer, and 25 parts of solvent. The preparation steps were adjusted to: increasing the high-speed stirring speed of the sunscreen coating to 600 r / min, extending the stirring time to 40 min, adding a step of ultrasonic dispersion with 300W power for 10 min, and using an ultrasonic frequency of 40 kHz; and extending the heat preservation time of the first stage of curing to 70 min. Example

[0029] Based on Example 2, the hydrolysis-condensation effect was optimized by replacing the hydrophobic modifier and adjusting the reaction temperature, thereby improving the hydrophobic self-cleaning performance. The remaining preparation conditions remained the same as in Example 2. The specific adjustments are as follows: The raw materials for the hydrophobic self-cleaning coating were adjusted to: 18 parts of silicone resin containing hydroxyl groups, 4 parts of dodecafluoroheptyl methacrylate, 5 parts of nano-silica powder, 0.4 parts of catalyst, and 20 parts of mixed solvent. The preparation steps were adjusted as follows: after heating the hydrophobic coating to 70°C, nano-silica powder was added and ultrasonically dispersed for 20 min; after adding the modifier and catalyst, the temperature was raised to 85°C and stirred for 70 min; the coating thickness was adjusted to 12 μm, and the temperature of the second curing stage was increased to 170°C and the holding time was extended to 45 min. Example

[0030] Based on Example 3, the weather resistance and durability of the product are improved by adding anti-aging components and optimizing the coating structure. The remaining preparation conditions are the same as in Example 3. The specific adjustments are as follows: Five parts of hydrogenated rosin, an anti-aging agent, were added to the sunscreen coating. The raw materials for the hydrophobic self-cleaning coating were adjusted to: 20 parts of silicone resin containing hydroxyl groups, 5 parts of dodecafluoroheptyl methacrylate, 6 parts of nano-silica powder, 0.5 parts of catalyst, and 22 parts of mixed solvent. The preparation steps were adjusted as follows: after adding the plasticizer to the sunscreen coating, the anti-aging agent was added, and stirring was continued for 15 minutes. After adding the nano-silica powder to the hydrophobic coating, a mixture of 2 parts hydrogenated rosin and sebacic acid in a weight ratio of 2:1 was added, and stirring was carried out for 10 minutes. The heating rate of the first stage of curing was adjusted to 4℃ / min, and the holding time of the second stage was extended to 50 minutes. Example

[0031] Based on Example 4, the raw material ratio was adjusted to the limit of a reasonable range to verify the feasibility of the product function within a wide ratio range. The remaining preparation conditions remained the same as in Example 4. The specific adjustments are as follows: The raw materials for the sunscreen coating were adjusted to: 60 parts of silicone resin, 22 parts of nano titanium dioxide, 13 parts of nano zinc oxide, 6 parts of dispersant, 6 parts of plasticizer, 35 parts of solvent, and 8 parts of anti-aging agent; the raw materials for the hydrophobic self-cleaning coating were adjusted to: 28 parts of silicone resin containing hydroxyl groups, 7 parts of dodecafluoroheptyl methacrylate, 10 parts of nano-silica powder, 1.0 part of catalyst, 32 parts of mixed solvent, and 3 parts of mixture; the preparation steps were adjusted to: increasing the high-speed stirring speed of the sunscreen coating to 700 r / min and extending the stirring time to 50 min, followed by ultrasonic dispersion for 15 min; ultrasonic dispersion of the hydrophobic coating for 25 min, followed by heat preservation and stirring for 80 min; the coating thickness was adjusted to: 25 μm for the sunscreen coating and 15 μm for the hydrophobic coating; the first stage curing temperature was increased to 130℃ and maintained for 80 min, and the second stage temperature was increased to 180℃ and maintained for 60 min.

[0032] Comparative Example 1: The nano-titanium dioxide and nano-zinc oxide were removed from the sunscreen coating, and the remaining preparation conditions were the same as in Example 1.

[0033] The product prepared in this comparative example has no sun protection effect and only possesses basic hydrophobic self-cleaning function, highlighting the core role of nano sunscreen agents in this invention.

[0034] Comparative Example 2: Perfluorooctyltrichlorosilane was removed from the hydrophobic self-cleaning coating, and the remaining preparation conditions were the same as in Example 1.

[0035] The product prepared in the comparative example could not achieve the hydrophobic self-cleaning function and its weather resistance was significantly reduced, proving the necessity of hydrophobic modifiers.

[0036] Comparative Example 3: The amount of nano-titanium dioxide in the sunscreen coating was adjusted to 30 parts and the amount of nano-zinc oxide was adjusted to 20 parts, while the other preparation conditions were the same as in Example 1.

[0037] The nanoparticles in the product prepared in the comparative example showed severe agglomeration, resulting in decreased light transmittance and easy peeling of the coating, which verified the rationality of the raw material ratio of the present invention.

[0038] Comparative Example 4: The steps of soaking and rinsing the substrate in the activation solution were omitted. The glass substrate was directly coated with a sunscreen coating after ultrasonic cleaning. The other preparation conditions were the same as in Example 1.

[0039] The product prepared in this comparative example had extremely poor coating adhesion and insufficient weather resistance, highlighting the necessity of substrate activation treatment.

[0040] Comparative Example 5: Only a sunscreen coating was prepared, without a hydrophobic self-cleaning coating; all other preparation conditions were the same as in Example 1. The product prepared in this comparative example lacked hydrophobic self-cleaning effect, and the sunscreen coating was prone to aging, demonstrating the superiority of the dual-coating synergistic design of this invention.

[0041] Performance testing and results analysis: Test sample: The products prepared in Examples 1 to 5, Comparative Examples 1 to 5, and the blank control group of ordinary float glass were selected as test samples. Three parallel samples were prepared for each sample, and the average value of the test results was taken to ensure the accuracy of the test data.

[0042] Test standards and methods: Sun protection performance: According to GB / T2680-2021 standard, the ultraviolet blocking rate, infrared blocking rate and visible light transmittance of the sample were determined by spectrophotometer, where the ultraviolet wavelength range was 200nm-400nm and the infrared wavelength range was 780nm-2500nm. Hydrophobic properties: In accordance with ASTM C813-20 standard, the static contact angle and roll-off angle of the samples were measured using a contact angle meter, and the hydrophobic stability was evaluated by immersing the samples in deionized water for 5 days. Self-cleaning performance: The stain removal rate was measured by manually applying simulated dust and rinsing, and the self-cleaning durability was evaluated by wiping 500 times. Adhesion: The cross-cut test was used for evaluation. The cross-cut test grid was 10×10. Grade 0 means no peeling. Weather resistance: evaluated using a xenon lamp aging test, with test conditions of 40℃, 60% humidity, and irradiation intensity of 1000W / m². 2 The samples were continuously irradiated for 1000 hours to test the performance changes of the aged samples.

[0043] The test results are shown in Table 1 below: Table 1: Example 1 92.3 85.7 88.5 152.1 8.3 93.2 0 2.4 Example 2 95.8 89.5 87.9 153.4 7.8 94.5 0 2.2 Example 3 96.1 90.2 88.2 158.7 6.5 96.3 0 1.9 Example 4 96.5 91.0 88.7 160.2 6.1 97.1 0 1.5 Example 5 96.8 91.8 87.2 159.1 6.4 96.5 0 1.6 Comparative Example 1 12.5 18.3 90.1 151.8 8.5 92.8 0 2.5 Comparative Example 2 92.1 85.5 89.2 78.3 35.6 32.7 1 15.8 Comparative Example 3 97.5 93.1 65.8 148.7 9.2 88.6 4 8.7 Comparative Example 4 91.8 85.2 88.8 145.3 10.5 89.3 5 20.3 Comparative Example 5 92.5 86.0 89.0 75.6 38.2 28.9 1 18.5 Blank Control 10.2 15.8 91.3 72.4 40.1 25.3 - - Results analysis: Test results show that the products prepared in Examples 1 to 5 all possess excellent comprehensive performance, with ultraviolet blocking rate ≥92%, infrared blocking rate ≥85%, visible light transmittance ≥87%, static contact angle ≥152°, roll-off angle ≤8.5°, stain removal rate ≥93%, adhesion reaching grade 0, excellent weather resistance, and a contact angle decrease of ≤2.5% after aging. Examples 2 to 5, through gradual optimization of raw material ratios and process parameters, show a gradient improvement in product performance, fully verifying the rationality and feasibility of the technical solution of this invention.

[0044] Comparative Example 1 lacked sun protection due to the absence of nano-sunscreen agents; Comparative Example 2 failed to achieve hydrophobic self-cleaning function due to the lack of hydrophobic modifiers; Comparative Example 3 suffered from decreased product performance due to an unreasonable sunscreen agent ratio; Comparative Example 4 experienced coating peeling due to the omission of substrate pretreatment; and Comparative Example 5 lacked functional synergy due to the use of a single coating. None of the above comparative examples achieved the technical effect of this invention. The blank control group showed no target function, further highlighting the technical advantages of this invention.

[0045] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. A sun-protective, hydrophobic, self-cleaning glass, characterized in that, The product comprises a conventional float glass substrate, a first coating, and a second coating. The first coating is applied to the surface of the conventional float glass substrate, and the second coating is applied to the surface of the first coating. The conventional float glass substrate is treated with an activation solution, which is a mixture of concentrated sulfuric acid and 30% hydrogen peroxide in a volume ratio of 3:

1. The first coating comprises, by weight, 30 parts of KH-550 silicone resin, 8 parts of 20nm nano-titanium dioxide, 5 parts of 30nm nano-zinc oxide, 2 parts of polyglycerol fatty acid ester, 2 parts of epoxidized soybean oil, and 20 parts of ethyl acetate. The second coating comprises, by weight, 15 parts of KH-560 silanol-containing silicone resin, 3 parts of modifier, 4 parts of 50nm nano-silica powder, 0.3 parts of dibutyltin dilaurate, and 18 parts of mixed solvent, which is a mixture of butyl acetate and n-butanol in a weight ratio of 3:

1.

2. The glass according to claim 1, characterized in that, The first coating also includes 5 parts by weight of hydrogenated rosin, and the second coating also includes 2 parts by weight of a mixture of hydrogenated rosin and sebacic acid in a weight ratio of 2:

1.

3. The glass according to claim 1, characterized in that, The modifier is perfluorooctyltrichlorosilane or dodecafluoroheptyl methacrylate; the first coating consists of 30-60 parts by weight of KH-550 silicone resin, 8-22 parts by weight of nano titanium dioxide, 5-13 parts by weight of nano zinc oxide, 2-6 parts by weight of polyglycerol fatty acid ester, 2-6 parts by weight of epoxidized soybean oil, and 20-35 parts by weight of ethyl acetate; the second coating consists of 15-28 parts by weight of KH-560 silicone resin containing silanol, 3-7 parts by weight of modifier, 4-10 parts by weight of nano-silica powder, 0.3-1.0 parts by weight of dibutyltin dilaurate, and 18-32 parts by weight of mixed solvent.

4. The glass according to claim 1, characterized in that, The thickness of the ordinary float glass substrate is 5mm, the thickness of the first coating is 18-25μm, and the thickness of the second coating is 10-15μm.

5. A method for preparing a sun-protective, hydrophobic, self-cleaning glass, characterized in that, The substrate pretreatment, first coating preparation, second coating preparation, and step-by-step curing are performed sequentially. The substrate pretreatment includes ultrasonic cleaning, immersion in activating solution, rinsing with deionized water, and nitrogen drying. The first coating is prepared by mixing the first coating material of claim 1 into a slurry, applying it by a scraper coating method, and then drying it; the second coating is prepared by mixing the second coating material of claim 1 into a slurry, applying it, and then drying it; the step-by-step curing is performed by heating and holding the temperature in sections and then naturally cooling it to 25°C.

6. The preparation method according to claim 5, characterized in that, The substrate pretreatment involves ultrasonically cleaning ordinary float glass sequentially with deionized water and anhydrous ethanol, immersing it in an activation solution under 0°C ice bath conditions, rinsing it with deionized water until neutral, and then drying it with nitrogen gas flow.

7. The preparation method according to claim 5, characterized in that, The first coating slurry was prepared by mixing and stirring KH-550 silicone resin with ethyl acetate, adding nano-titanium dioxide and nano-zinc oxide and stirring, and then adding polyglycerol fatty acid ester and epoxidized soybean oil and stirring.

8. The preparation method according to claim 5, characterized in that, The second coating slurry is prepared by heating and stirring KH-560 hydroxyl-containing organosilicon resin with a mixed solvent, adding nano-silicon powder for ultrasonic dispersion, adding a modifier and dibutyltin dilaurate, heating and stirring.

9. The preparation method according to claim 5, characterized in that, The ultrasonic treatment power is 300W, the frequency is 40kHz, and the stirring speed is 500-700r / min.

10. The preparation method according to claim 5, characterized in that, The step-by-step curing heating rate is 4-5℃ / min. The first stage involves heating to 120-130℃ and holding at that temperature, while the second stage involves heating to 160-180℃ and holding at that temperature.