Preparation method of self-cleaning pink car paint

Abstract

The application relates to a preparation method of a self-cleaning pink car film, and belongs to the technical field of car film membranes, and comprises the following steps: S1, preparing a diamond-like carbon layer on a transparent substrate by adopting a direct-current radio frequency coupling sputtering process; S2, preparing a low-refractive-index medium layer on the surface of the diamond-like carbon layer by adopting a medium-frequency reaction sputtering process; S3, preparing a high-refractive-index medium layer on the surface of the low-refractive-index medium layer by adopting the medium-frequency reaction sputtering process; S4, preparing an anti-fouling protective layer on the surface of the high-refractive-index medium layer by adopting a slit coating process; and S5, preparing an adhesive layer on the other side of the transparent substrate by adopting a doctor blade coating process, so that the self-cleaning pink car film is obtained.The pink car film prepared by the method has the advantages of high color saturation, long service life, seamless connection with existing production equipment, easy large-scale industrial application, and important application value in the technical field of car film membranes.

Description

Technical Field

[0001] This invention belongs to the field of car wrap film technology, specifically, it relates to a method for preparing a self-cleaning pink car wrap. Background Technology

[0002] Structural colors are various colors produced by scattering, diffraction, or interference of light of different wavelengths through an ordered micro-nano structure. Compared with traditional pigment colors, they have unique advantages such as bright colors, never fading, and controllable colors.

[0003] With the increasing popularity of private cars, various customized car wraps are attracting more and more attention. Traditional car wrap color changes typically use a flexible transparent substrate. Colored pigments are added during the substrate molding process, and the substrate is extruded and cast to form a colored substrate, which is then further processed to form the color-changing car wrap. Another method achieves color by adding a color-changing layer to the car wrap film. Patent CN 112940634A, "A TPU Effect Color-Changing Car Wrap and its Preparation Process," uses a coating process to first coat a color-changing layer composed of a PU ink system onto a PET film, and then uses high-temperature lamination to transfer and bond it to a transparent substrate. Patent CN116333618A, "A Color-Changing Car Wrap and its Preparation Method," uses a coating process to coat the surface of a transparent substrate with a water-based pigment of the corresponding color, and then dries it to form a color-changing layer. All of the above color-changing methods use chemical pigments, which are prone to low color brightness, poor durability, and easy fading when exposed to sunlight for extended periods. In addition, since car covers themselves do not have a self-cleaning function, dirt can easily penetrate into the interior of the car cover film, causing damage to the car cover and shortening its service life. Therefore, there is an urgent need to invent a car cover with uniform color, not easy to fade, high durability, and a surface with hydrophobic and self-cleaning functions to meet the higher requirements of the car cover film technology field. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for preparing a self-cleaning pink car cover.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A method for preparing a self-cleaning pink car wrap includes the following steps:

[0007] S1. Using a vacuum roll-to-roll magnetron sputtering coating equipment, a carbon film (diamond-like layer) with a thickness of 1-2 μm is prepared on a flexible transparent substrate by DC radio frequency coupling sputtering process;

[0008] S2. Using a vacuum roll-to-roll magnetron sputtering coating equipment, a low-refractive-index dielectric layer is prepared on the carbon film surface using a medium-frequency reactive sputtering process. The low-refractive-index dielectric layer is an AlO film with a thickness of 90-150 nm. X NY Thin films with a refractive index ranging from 1.7 to 1.9;

[0009] S3. Using a vacuum roll-to-roll magnetron sputtering coating system, a high-refractive-index dielectric layer is prepared on the surface of a low-refractive-index dielectric layer using a medium-frequency reactive sputtering process. The high-refractive-index dielectric layer, combined with a carbon film and a low-refractive-index dielectric layer, forms a composite coloring layer. The high-refractive-index dielectric layer is an AlO film with a thickness of 180-240 nm. X N Y Thin film with a refractive index ranging from 2.0 to 2.2;

[0010] S4. Using roll-to-roll slit coating equipment, an anti-fouling protective layer is prepared on the surface of a high refractive index dielectric layer using a slit coating process with a fluorine-free silica sol solution as the raw material. The anti-fouling protective layer has a thickness of 60-150 nm.

[0011] S5. Using a scraping process, first scrape a polyacrylate adhesive layer onto the PET release film. The adhesive layer thickness is 20-70μm. After the adhesive layer is semi-dry, it is directly bonded to the uncoated side of the flexible transparent substrate using a room temperature lamination method. After drying, a self-cleaning pink car wrap is obtained.

[0012] Furthermore, in step S1, the sputtering target is a 99.999% pure graphite target, the sputtering process gas is Ar, the sputtering power supply is a DC RF coupled power supply, and the base vacuum level of the chamber is ≤3.5×10⁻⁶. -4 The operating pressure is 0.3-1.2 Pa, the DC sputtering power is 150-300 W, the RF sputtering power is 50-150 W, the Ar flow rate is 30 sccm, the sputtering time is 120-240 min, and the substrate linear velocity is 0.1 mm / s.

[0013] Furthermore, in step S1, the flexible transparent substrate is one of polyurethane film, polyvinyl chloride film, and polyimide film.

[0014] Furthermore, in step S2, the sputtering target is a 99.99% pure aluminum target, the sputtering process gas is Ar, the reaction process gases are N2 and O2, the sputtering power supply is a medium-frequency power supply, and the background vacuum of the chamber is ≤3.0×10⁻⁶. -4 The working pressure is 0.3-1.0 Pa, the medium frequency sputtering power is 1000-5000 W, the Ar flow rate is 30 sccm, the O2 flow rate is 5 sccm, the N2 flow rate is 2 sccm, the sputtering time is 30-60 min, and the substrate linear velocity is 0.3 mm / s.

[0015] Furthermore, in step S3, the sputtering target is a 99.99% pure aluminum target, the sputtering process gas is Ar, the reaction process gases are N2 and O2, the sputtering power supply is a medium-frequency power supply, and the background vacuum of the chamber is ≤3.0×10⁻⁶. -4The working pressure is 0.3-1.0 Pa, the medium frequency sputtering power is 1000-5000 W, the Ar flow rate is 30 sccm, the O2 flow rate is 1 sccm, the N2 flow rate is 6 sccm, the sputtering time is 40-70 min, and the substrate linear velocity is 0.2 mm / s.

[0016] Furthermore, the raw materials for the fluorine-free silica sol solution in step S4, by weight percentage, are: tetraethyl orthosilicate 4-6%, isopropanol 10-20%, hexamethylcyclotrisilazane 3-10%, anhydrous ethanol 40%, polyethylene glycol 1%-10%, and the balance being deionized water.

[0017] Furthermore, in step S4, the height gap between the coating head of the roll-to-roll slit coating equipment and the flexible transparent substrate is set to 140 μm, the substrate moving speed is 15-20 m / h, the solution supply speed is 4 mL / h, and the near-infrared annealing temperature is 100-150℃.

[0018] Furthermore, in step S5, the distance between the doctor blade and the release film in the coating process is 400 μm, the doctor blade forward speed is 10-30 cm / s, and the nitrogen gas flow direction is the same as the doctor blade movement direction.

[0019] A carbon film with a diamond-like carbon layer is formed on a flexible transparent substrate using DC RF coupling sputtering, effectively increasing the tensile strength of the substrate and improving the adhesion between the film and the substrate. A high- and low-refractive-index dielectric layer composed of the same material, prepared using mid-frequency reactive sputtering, not only increases color saturation but also effectively enhances its weather resistance and lifespan. A non-destructive vacuum roll-to-roll continuous manufacturing process significantly reduces the production cost of large-scale car cover production and improves its efficiency. A non-fluorinated anti-fouling layer prepared using a scraping process not only effectively reduces the corrosive effect of fluorinated materials on the car cover but also improves its overall self-cleaning function.

[0020] The beneficial effects of this invention are:

[0021] The car cover produced by this invention has high color saturation, is not easy to fade, has a long service life, and has high tensile strength and weather resistance. The preparation process does not include the use of fluorine-containing materials that pollute the environment, and it is easy to apply on a large scale in industry. Finally, the car cover not only has a pink appearance, but also has a contact angle ≥140° and a roll-off angle ≤15°, which has a significant self-cleaning effect and has important application value in the field of car cover film technology. Attached Figure Description

[0022] The invention will now be further described with reference to the accompanying drawings.

[0023] Figure 1 This is a flowchart illustrating the preparation process of the self-cleaning pink car cover of the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of the self-cleaning pink car cover of the present invention;

[0025] Figure 3 This is a chromaticity coordinate diagram of the self-cleaning pink car wrap obtained in Example 1 of the present invention;

[0026] Figure 4 This is a test diagram of the contact angle of the self-cleaning pink car cover obtained in Example 1 of the present invention.

[0027] In the figure: 1. Flexible transparent substrate; 2. Composite coloring layer; 3. Anti-fouling protective layer; 4. Adhesive layer; 5. Carbon film; 6. Low refractive index dielectric layer; 7. High refractive index dielectric layer. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1

[0030] according to Figure 1 The preparation process shown describes the preparation of a self-cleaning pink car wrap, which includes the following steps:

[0031] S1. A rolled polyimide film is selected as the flexible transparent substrate 1. A carbon film 5 is prepared on the flexible transparent substrate 1 using a vacuum roll-to-roll magnetron sputtering coating equipment and a DC-RF coupled sputtering process. The sputtering target is a 99.999% pure graphite target, the sputtering process gas is Ar, the sputtering power supply is a DC-RF coupled power supply, and the background vacuum of the chamber is 3.5 × 10⁻⁶. -4 The working pressure was 0.3 Pa, the DC sputtering power was 300 W, the RF sputtering power was 50 W, the Ar flow rate was 30 sccm, the sputtering time was 120 min, and the substrate linear velocity was 0.1 mm / s, resulting in a black diamond-like carbon film, i.e., carbon film 5.

[0032] S2. Using a vacuum roll-to-roll magnetron sputtering coating system, a low-refractive-index dielectric layer 6 is prepared on a carbon film 5 using a medium-frequency reactive sputtering process. The sputtering target is a 99.99% pure aluminum target, the sputtering process gas is Ar, the reaction process gases are N2 and O2, the sputtering power supply is a medium-frequency power supply, and the background vacuum of the chamber is 3.0 × 10⁻⁶. -4Pa, working pressure 0.3 Pa, medium frequency sputtering power 1000 W, Ar flow rate 30 sccm, O2 flow rate 5 sccm, N2 flow rate 2 sccm, sputtering time 30 min, substrate linear velocity 0.3 mm / s, to obtain low refractive index dielectric layer 6;

[0033] S3. Using a vacuum roll-to-roll magnetron sputtering coating system, a high refractive index dielectric layer 7 is prepared on the surface of the low refractive index dielectric layer 6 using a medium-frequency reactive sputtering process; the sputtering target is a 99.99% pure aluminum target, the sputtering process gas is Ar, the reaction process gases are N2 and O2, the sputtering power supply is a medium-frequency power supply, and the background vacuum degree of the chamber is 3.0 × 10⁻⁶. -4 Pa, working pressure is 1.0 Pa, medium frequency sputtering power is 5000 W, Ar flow rate is 30 sccm, O2 flow rate is 1 sccm, N2 flow rate is 6 sccm, sputtering time is 70 min, substrate linear velocity is 0.2 mm / s, to obtain high refractive index dielectric layer 7, which is combined with carbon film 5 and low refractive index dielectric layer 6 to form composite coloring layer 2.

[0034] S4. After the coating is completed, the flexible transparent substrate 1 is removed from the vacuum. Using a roll-to-roll slit coating equipment, an antifouling protective layer 3 is prepared on the surface of the high refractive index dielectric layer 7 using a slit coating process. First, add 4% tetraethyl orthosilicate and 20% isopropanol by weight percentage, stir for 20 minutes, then add 3% hexamethylcyclotrisilazane, 40% anhydrous ethanol, 10% polyethylene glycol, and the remainder deionized water, and stir vigorously again for 120 minutes. After the solution is mixed evenly, transfer it to the roll-to-roll slit coating equipment. The gap height between the coating head and the flexible transparent substrate is set to 140 μm, the substrate moving speed is 20 m / h, and the solution supply speed is 4 mL / h. After coating, a near-infrared annealing process is used with a temperature set to 100℃ to obtain the antifouling protective layer 3.

[0035] S5. Using a scraping process, first scrape a polyacrylate adhesive layer 4 onto the PET release film; the distance between the scraper and the release film is 400μm, the scraper advance speed is 10cm / s, the nitrogen airflow direction is the same as the scraper movement direction, and after the adhesive layer is semi-dry, it is directly bonded to the uncoated side of the flexible transparent substrate 1 by room temperature lamination, and then put into a drying oven at a temperature of 70℃ for 40h to obtain the car cover.

[0036] Example 2

[0037] according to Figure 1 The preparation process shown describes the preparation of a self-cleaning pink car wrap, which includes the following steps:

[0038] S1. A rolled polyvinyl chloride film is selected as the flexible transparent substrate 1. A carbon film 5 is prepared on the flexible transparent substrate 1 using a vacuum roll-to-roll magnetron sputtering coating equipment and a DC-RF coupled sputtering process. The sputtering target is a 99.999% pure graphite target, the sputtering process gas is Ar, the sputtering power supply is a DC-RF coupled power supply, and the background vacuum of the chamber is 2.1 × 10⁻⁶. -4 The working pressure was 1.2 Pa, the DC sputtering power was 150 W, the RF sputtering power was 150 W, the Ar flow rate was 30 sccm, the sputtering time was 240 min, and the substrate linear velocity was 0.1 mm / s, resulting in a black diamond-like carbon film, i.e., carbon film 5.

[0039] S2. Using a vacuum roll-to-roll magnetron sputtering coating system, a low-refractive-index dielectric layer 6 is prepared on a carbon film 5 using a medium-frequency reactive sputtering process. The sputtering target is a 99.99% pure aluminum target, the sputtering process gas is Ar, the reaction process gases are N2 and O2, the sputtering power supply is a medium-frequency power supply, and the background vacuum of the chamber is 2.3 × 10⁻⁶. -4 Pa, working pressure is 1.0 Pa, medium frequency sputtering power is 5000 W, Ar flow rate is 30 sccm, O2 flow rate is 5 sccm, N2 flow rate is 2 sccm, sputtering time is 60 min, substrate linear velocity is 0.3 mm / s, resulting in a low refractive index dielectric layer 6.

[0040] S3. Using a vacuum roll-to-roll magnetron sputtering coating system, a high refractive index dielectric layer 7 is prepared on the surface of the low refractive index dielectric layer 6 using a medium-frequency reactive sputtering process; the sputtering target is a 99.99% pure aluminum target, the sputtering process gas is Ar, the reaction process gases are N2 and O2, the sputtering power supply is a medium-frequency power supply, and the background vacuum degree of the chamber is 2.1 × 10⁻⁶. -4 Pa, working pressure is 1.0 Pa, medium frequency sputtering power is 1000 W, Ar flow rate is 30 sccm, O2 flow rate is 1 sccm, N2 flow rate is 6 sccm, sputtering time is 40 min, substrate linear velocity is 0.2 mm / s, to obtain high refractive index dielectric layer 7, which is combined with carbon film 5 and low refractive index dielectric layer 6 to form composite coloring layer 2.

[0041] S4. After the coating is completed, the flexible transparent substrate 1 is removed from the vacuum. Using a roll-to-roll slit coating equipment, an anti-fouling protective layer 3 is prepared on the surface of the high refractive index dielectric layer 7 using a slit coating process. First, 6% tetraethyl orthosilicate and 10% isopropanol are added according to the weight percentage. After stirring for 20 minutes, 10% hexamethylcyclotrisilazane, 40% anhydrous ethanol, 1% polyethylene glycol, and the remainder deionized water are added. The mixture is stirred vigorously again for 120 minutes. After the solution is mixed evenly, it is transferred to the roll-to-roll slit coating equipment. The gap height between the coating head and the flexible substrate is set to 140 μm, the substrate moving speed is 15 m / h, and the solution supply speed is 4 mL / h. After coating, a near-infrared annealing process is used with the temperature set to 150℃ to obtain the anti-fouling protective layer 3.

[0042] S5. Using a scraping process, first scrape a polyacrylate adhesive layer 4 onto the PET release film; the distance between the scraper and the release film is 400μm, the scraper advance speed is 30cm / s, the nitrogen airflow direction is the same as the scraper movement direction, and after the adhesive layer is semi-dry, it is directly bonded to the uncoated side of the flexible transparent substrate 1 by room temperature lamination, and then put into a drying oven at a temperature of 70℃ for 40h to dry, thus obtaining the car cover.

[0043] Example 3

[0044] S1. A rolled polyurethane film is selected as the flexible transparent substrate 1. A roll-to-roll magnetron sputtering coating device is used to prepare a carbon film 5 on the flexible transparent substrate 1 using a DC-RF coupled sputtering process. The sputtering target is a 99.999% pure graphite target, the sputtering process gas is Ar, the sputtering power supply is a DC-RF coupled power supply, and the background vacuum of the chamber is 2.5 × 10⁻⁶. - 4 The working pressure was 0.7 Pa, the DC sputtering power was 200 W, the RF sputtering power was 100 W, the Ar flow rate was 30 sccm, the sputtering time was 200 min, and the substrate linear velocity was 0.1 mm / s, resulting in a black diamond-like carbon film, i.e., carbon film 5.

[0045] S2. A low-refractive-index dielectric layer 6 is prepared on carbon film 5 using a medium-frequency reactive sputtering process. A vacuum roll-to-roll magnetron sputtering coating system is used, with a sputtering target of 99.99% purity aluminum, sputtering process gas Ar, and reaction process gases N2 and O2. A medium-frequency power supply is used, and the background vacuum level of the chamber is 2.5 × 10⁻⁶. -4 Pa, working pressure 0.6 Pa, medium frequency sputtering power 2500 W, Ar flow rate 30 sccm, O2 flow rate 5 sccm, N2 flow rate 2 sccm, sputtering time 45 min, substrate linear velocity 0.3 mm / s, to obtain low refractive index dielectric layer 6;

[0046] S3. Using a vacuum roll-to-roll magnetron sputtering coating system, a high refractive index dielectric layer 7 is prepared on the surface of the low refractive index dielectric layer 6 using a medium-frequency reactive sputtering process. The sputtering target is a 99.99% pure aluminum target. The sputtering process gas is Ar, and the reaction process gases are N2 and O2. The sputtering power supply is a medium-frequency power supply, and the background vacuum of the chamber is 2.5 × 10⁻⁶. -4 Pa, working pressure is 0.6 Pa, medium frequency sputtering power is 3000 W, Ar flow rate is 30 sccm, O2 flow rate is 1 sccm, N2 flow rate is 6 sccm, sputtering time is 55 min, substrate linear velocity is 0.2 mm / s, to obtain high refractive index dielectric layer 7, which is combined with carbon film 5 and low refractive index dielectric layer 6 to form composite coloring layer 2.

[0047] S4. After the coating is completed, the flexible transparent substrate 1 is removed from the vacuum. Using a roll-to-roll slit coating equipment, an antifouling protective layer 3 is prepared on the surface of the high refractive index dielectric layer 7 using a slit coating process. First, add 5% tetraethyl orthosilicate and 15% isopropanol according to the weight percentage, stir for 20 minutes, then add 6% hexamethylcyclotrisilazane, 40% anhydrous ethanol, 5% polyethylene glycol and the remainder deionized water, and stir vigorously again for 120 minutes. After the solution is mixed evenly, transfer it to the roll-to-roll slit coating equipment. The gap height between the coating head and the flexible substrate is set to 140 μm, the substrate moving speed is 18 m / h, and the solution supply speed is 4 mL / h. After coating, a near-infrared annealing process is used with the temperature set to 120℃ to obtain the antifouling protective layer 3.

[0048] S5. Using a scraping process, first scrape a polyacrylate adhesive layer 4 onto the PET release film. The distance between the scraper and the release film is 400μm, the scraper advance speed is 20cm / s, and the nitrogen gas flow direction is the same as the scraper movement direction. After the adhesive layer is semi-dry, it is directly bonded to the uncoated side of the flexible transparent substrate 1 using a room temperature lamination method. Then, it is dried in a drying oven at a temperature of 70℃ for 40 hours to obtain the car cover.

[0049] Comparative Example

[0050] Use commercially available hydrophobic car wrap film.

[0051] The car wraps prepared in Examples 1-3 were subjected to colorimetric tests. When light was incident perpendicularly from the upper surface of the film along the normal direction and observed at a 0° angle in the opposite direction along the perpendicular incident direction, the color coordinates of the reflected structural color are shown in Table 1:

[0052] Table 1

[0053] Test Project Example 1 Example 2 Example 3 L* value 53.2 57.1 55.0 a* value 35.0 38.2 36.1 b* value 3.3 16.1 12.5

[0054] Based on Table 1 and combined with Figure 3 It can be seen that the car cover obtained in Example 1 of the present invention is pink and has high color saturation.

[0055] The following performance tests were conducted on Examples 1-3 and the comparative example:

[0056] Tensile strength was determined according to the national standard GB / T 1040.3-2006 "Determination of tensile properties of plastics - Part 3: Test conditions for films and sheets";

[0057] The surface contact angle and roll-off angle were determined according to the national standard GB / T 30693-2014 "Measurement of the contact angle between plastic film and water" and based on SEM images.

[0058] Yellowing resistance was determined using standard HGI 3689-2001;

[0059] The measurement results are shown in Table 2:

[0060] Table 2

[0061] Test Project Example 1 Example 2 Example 3 Comparative Example Tensile strength / MPa 37.7 38.1 38.4 31.1 Surface contact angle / ° 140 143 145 136 Roll angle / ° 15 12 10 17 Yellowing resistance rating / grade 5 5 5 3

[0062] As shown in Table 2, the car cover prepared by the embodiments of the present invention has a high yellowing resistance rating, a long service life, and high tensile strength and weather resistance. In addition, the car cover surface has a contact angle ≥140° and a roll-off angle ≤15°, which has a significant self-cleaning effect and has important application value in the field of car cover film technology.

[0063] In the description of this specification, the references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0064] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A method for preparing a self-cleaning pink car paint, characterized in that, The method comprises the following steps: S1, preparing a carbon film on a flexible transparent substrate by a direct current radio frequency coupling sputtering process, with a thickness of 1-2 μm; S2, a low refractive index dielectric layer is prepared on the surface of the carbon film by a medium frequency reactive sputtering process, the low refractive index dielectric layer is AlO X N Y The thin film has a refractive index in the range of 1.7-1.

9. S3, using the intermediate frequency reactive sputtering process to prepare high refractive index medium layer on the surface of low refractive index medium layer, the high refractive index medium layer combines carbon film and low refractive index medium layer to form composite color layer; the high refractive index medium layer is AlO X N Y Thin film, refractive index range is 2.0-2.2; S4, preparing an anti-fouling protective layer on the surface of the high refractive index medium layer by a slot coating process using a fluorine-free silicon sol solution as raw material, with a thickness of 60-150 nm; S5, first coating a polyacrylate adhesive layer on a PET release film by a doctor blade coating process, with a thickness of 20-70 μm, and then directly laminating the adhesive layer on the uncoated side of the flexible transparent substrate by a room temperature lamination method after the adhesive layer is semi-dried, and drying to obtain a self-cleaning pink car cover; In step S4, the raw material of the fluorine-free silicon sol solution is as follows in terms of weight percentage: tetraethyl orthosilicate 4-6%, isopropyl alcohol 10-20%, hexamethylcyclotrisilazane 3-10%, anhydrous ethanol 40%, polyethylene glycol 1-10%, and the balance being deionized water.

2. The method of claim 1, wherein the self-cleaning pink car paint is prepared by the steps of: The sputtering target in step S1 is a graphite target with a purity of 99.999%, the sputtering process gas is Ar, the sputtering power source is a direct current radio frequency coupling power source, the base vacuum degree of the chamber is ≤3.5×10 -4 Pa, the working pressure is 0.3-1.2 Pa, the direct current sputtering power is 150-300 W, the radio frequency sputtering power is 50-150 W, the Ar flow rate is 30 sccm, the sputtering time is 120-240 min, and the substrate linear velocity is 0.1 mm / s.

3. The method of claim 1, wherein the self-cleaning pink car paint is prepared by the steps of: In step S1, the flexible transparent substrate is one of a polyurethane film, a polyvinyl chloride film, and a polyimide film.

4. The method of claim 1, wherein the self-cleaning pink car paint is prepared by the steps of: The sputtering target in step S2 is a 99.99% pure aluminum target, the sputtering process gas is Ar, the reaction process gas is N2 and O2, the sputtering power source is a medium frequency power source, the base vacuum degree of the chamber is ≤3.0×10 -4 Pa, the working pressure is 0.3-1.0 Pa, the medium frequency sputtering power is 1000-5000 W, the Ar flow rate is 30 sccm, the O2 flow rate is 5 sccm, the N2 flow rate is 2 sccm, the sputtering time is 30-60 min, and the substrate linear velocity is 0.3 mm / s.

5. The method of claim 1, wherein the self-cleaning pink car paint is prepared by the steps of: The sputtering target in step S3 is a 99.99% pure aluminum target, the sputtering process gas is Ar, the reaction process gas is N2 and O2, the sputtering power source is a medium frequency power source, the base vacuum degree of the chamber is ≤3.0×10 -4 Pa, the working pressure is 0.3-1.0 Pa, the medium frequency sputtering power is 1000-5000 W, the Ar flow rate is 30 sccm, the O2 flow rate is 1 sccm, the N2 flow rate is 6 sccm, the sputtering time is 40-70 min, and the substrate linear velocity is 0.2 mm / s.

6. The method of claim 1, wherein the self-cleaning pink car paint is prepared by the steps of: In step S4, the gap height between the coating head of the slot coating equipment and the flexible transparent substrate is set to 140 μm, the substrate moving speed is 15-20 m / h, the solution supply speed is 4 mL / h, and the near-infrared annealing temperature is 100-150 °C.

7. The method for preparing a self-cleaning pink car cover according to claim 1, characterized in that, In step S5, the distance between the doctor blade and the release film in the doctor blade coating process is 400 μm, the doctor blade advancing speed is 10-30 cm / s, and the nitrogen gas flow direction is the same as the doctor blade moving direction.

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