Automobile paint surface protective film with self-repairing super-hydrophobic performance

Abstract

The utility model discloses an automobile paint surface protective film, and particularly relates to an automobile paint surface protective film with self-repairing and super-hydrophobic performance, the layered structure of the automobile paint surface protective film comprises a composite super-hydrophobic coating with a self-similar double-layer structure, a TPU (thermoplastic polyurethane) substrate layer, a pressure-sensitive adhesive layer and a release film layer which are compounded in sequence, wherein the composite super-hydrophobic coating with the self-similar double-layer structure comprises a surface nano-SiO2 coating and a bottom EP / silicone adhesive / nano-SiO2 coating. The self-repairing super-hydrophobic coating solves the technical problem of effectively improving the wear resistance and corrosion resistance of the self-repairing super-hydrophobic coating of the automobile paint protective film. According to the automobile paint surface protection film with the self-repairing and super-hydrophobic performance, the super-hydrophobic performance, the acid and alkali resistance, the mechanical stability and the self-cleaning performance of the surface of the automobile paint surface protection film are excellent.

Description

Technical Field

[0001] The utility model relates to an automobile paint surface protective film, in particular to an automobile paint surface protective film with self-repairing super-hydrophobicity. Background Art

[0002] Automotive paint protection film, commonly known as paint film, is applied to the painted surface of a car to protect the paint, providing scratch resistance, stain resistance, environmental corrosion resistance, and decorative aesthetics. Commercially available paint films are typically coated with a self-healing coating. If the car body is scratched or slightly impacted, minor scratches will disappear automatically or with heat, as long as the film itself is not damaged. If a serious impact damages the film, the film can be partially replaced.

[0003] The most critical material in self-healing car wraps is the self-healing coating. The coating's performance determines the quality of the film. High-end car wraps not only have excellent self-healing properties but also possess super-hydrophobic properties, making them highly stain-resistant. They easily remove stains like dust, bird droppings, oil, and water spots.

[0004] In the existing technology, various artificial super-hydrophobic surfaces have been produced on the surface of automobile paint protection films through chemical vapor deposition, electrospinning, photolithography, replication and self-assembly. They can be roughly divided into two categories: one is to modify the rough surface with low surface energy materials, and the other is to construct a rough structure on the hydrophobic surface.

[0005] However, the super-hydrophobic surface of the above-mentioned automotive paint protection film is easily damaged due to its rough surface morphology, easy mechanical wear, weak adhesion to the substrate, and poor resistance to harsh conditions.

[0006] Lu Zhenzhen, Tang Chao, and others proposed the preparation and properties of a self-similar double-layer self-healing superhydrophobic coating (Surface Technology; Vol. 51, No. 2, February 2022). The abstract states: A coating base layer was prepared by mixing epoxy resin, neutral silicone adhesive, and hydrophobic nano-SiO2. The nano-SiO2 was then mixed with anhydrous ethanol to form a coating top layer. A two-step dip-coating method was used to prepare a self-healing double-layer superhydrophobic coating on a glass slide. The micromorphology, molecular structure, and wettability of the composite coating were characterized using scanning electron microscopy, Fourier transform infrared spectroscopy, and contact angle measurement. The mechanical stability, acid and alkali resistance, self-cleaning ability, water impact resistance, and self-healing mechanism of the composite coating were investigated. The prepared double-layer superhydrophobic coating exhibited excellent superhydrophobic properties and self-healing capabilities. The coating's static water contact angle reached 156°±1.8°. After 30 cycles of mechanical wear, the surface layer was completely destroyed, exposing the underlying layer, leaving a contact angle of 125°±1°. Heating the coating at 130°C for 1 hour restored the contact angle to 157°±1.6°, restoring its superhydrophobicity. The prepared coating also exhibited excellent acid resistance and self-cleaning abilities, as well as self-healing abilities after alkaline damage and water impact damage. The self-similar bilayer structure imparts self-healing capabilities to the superhydrophobic coating, effectively enhancing its wear resistance, corrosion resistance, and water impact resistance.

[0007] Therefore, the applicant proposed the present utility model. Summary of the Invention

[0008] The purpose of the utility model is to address the deficiencies of the above-mentioned prior art and to provide a car paint protection film with self-healing super-hydrophobic properties. The construction of the self-similar double-layer structure on the surface of the film enables the super-hydrophobic coating to have self-healing ability, while effectively improving the wear resistance and corrosion resistance of the super-hydrophobic coating.

[0009] In order to achieve the above-mentioned purpose, the utility model designs a car paint protection film with self-healing superhydrophobic properties, whose layered structure includes: a composite superhydrophobic coating with a self-similar double-layer structure, a TPU substrate layer, a pressure-sensitive adhesive layer and a release film layer compounded in sequence; wherein, the composite superhydrophobic coating with a self-similar double-layer structure includes a surface nano-SiO2 coating and a bottom EP / silicone adhesive / nano-SiO2 coating.

[0010] The self-similar, dual-layer composite superhydrophobic coating in the aforementioned automotive paint protection film is produced by physically mixing epoxy resin (EP), silicone adhesive, and nano-SiO2 (nano-SiO2) particles, leveraging the low surface energy of the hydrophobic nano-SiO2 particles. Its self-healing function is primarily manifested in that once the surface nano-SiO2 layer wears away and loses its superhydrophobicity, heating causes the low-surface-energy silicone adhesive / nano-SiO2 within the underlying EP / silicone adhesive / nano-SiO2 coating to rapidly migrate to the coating's surface, renewing the superhydrophobicity by imbuing the underlying and surface nano-SiO2 layers with similar hydrophobic composition and structure. The advantage of this dual-layer superhydrophobic coating lies in the fact that the surface layer provides initial superhydrophobicity while also protecting the underlying layer from damage. The underlying layer acts as an adhesive, securing the surface layer to the TPU substrate of the automotive paint protection film, enhancing its mechanical stability. Furthermore, heating can restore superhydrophobicity even after the surface layer has worn away and lost its superhydrophobicity. A single-layer superhydrophobic structure is extremely easy to be destroyed, but by constructing a double-layer structure, the service life of the superhydrophobic coating can be increased.

[0011] The self-healing principle of the self-similar double-layer composite superhydrophobic coating includes two aspects: (1) the formation of a self-similar structure. The low surface energy and rough structure provided by the superhydrophobic nano-SiO2 are the source of the initial superhydrophobicity of the double-layer superhydrophobic coating. When the surface layer is completely worn and loses its superhydrophobicity, the bottom EP / silicone glue / nano-SiO2 composite coating is heated to cause the nano-SiO2 to migrate to the upper layer of the coating, providing a large number of micro- / nanoscale protrusions and pores on the coating surface to form a microstructure similar to the surface nano-SiO2 layer. (2) The migration of low-surface-energy substances within the coating. After the surface layer is destroyed and not heated, there are more large-pore pores in the EP / silicone glue / nano-SiO2 composite coating. This is because the addition of epoxy resin causes nano-SiO2 to agglomerate, delaying the spontaneous migration of low-surface-energy substances to the surface. After high-temperature heating, the migration speed of low-surface-energy substances silicone glue / nano-SiO2 from the inside of the coating to the surface can be increased, so that the coating can restore its super-hydrophobic properties.

[0012] In the above-mentioned automobile paint protection film with self-repairing super-hydrophobic properties, the thickness of the self-similar double-layer composite super-hydrophobic coating in its layered structure is preferably selected to be 6 μm-15 μm.

[0013] The above-mentioned automotive paint protection film with self-repairing superhydrophobic properties, in which the TPU substrate layer in the layered structure is preferably an aliphatic TPU substrate layer, the surface hardness is preferably 80A-93A, the visible light transmittance is preferably above 90%, the elongation at break is preferably above 300%, the haze is preferably below 2%, and the thickness is preferably 100μm-300μm.

[0014] The above-mentioned automobile paint protection film with self-repairing superhydrophobic properties has a layered structure in which the pressure-sensitive adhesive layer is preferably an acrylic pressure-sensitive adhesive layer or a polyurethane pressure-sensitive adhesive layer, the visible light transmittance is preferably above 90%, and the thickness is preferably 10μm-50μm.

[0015] The above-mentioned self-repairing superhydrophobic automotive paint protection film has a layered structure in which the release film layer is preferably a PET release film layer, more preferably a white PET release film layer, the haze is preferably above 70%, the release force is preferably within 20 g / inch, and the thickness is preferably 23 μm-100 μm.

[0016] Preferably, the above-mentioned automobile paint protection film with self-repairing superhydrophobic properties further includes a protective film layer in its layered structure, which is composited to the surface of the composite superhydrophobic coating with a self-similar double-layer structure.

[0017] The protective film layer can protect the composite super-hydrophobic coating with a self-similar double-layer structure to the greatest extent, so as to avoid the situation where "the composite super-hydrophobic coating with a self-similar double-layer structure is scratched and worn during packaging, transportation and construction."

[0018] In the above-mentioned car paint protection film with self-repairing super-hydrophobic properties, the protective film layer in its layered structure is preferably a PET protective film, and its thickness is preferably 12μm-75μm.

[0019] Compared with the prior art, the self-repairing super-hydrophobic car paint protection film obtained by the present invention has the following technical effects:

[0020] The utility model discloses a car paint protection film with self-repairing super-hydrophobic properties. The self-similar double-layer structure in its layered structure has the ability to self-repair after mechanical damage. After the surface nano-SiO2 layer is completely worn out, the underlying EP / silicone glue / nano-SiO2 composite coating can be made super-hydrophobic by simply heating, so that the coating can still meet the super-hydrophobic requirements.

[0021] The utility model discloses a car paint protection film with self-repairing superhydrophobicity. The self-similar double-layer structure in the layered structure has good acid resistance. After being destroyed by an alkaline solution and losing the superhydrophobicity, the superhydrophobicity can be restored by heating at 130°C.

[0022] The utility model relates to a car paint protection film with self-repairing super-hydrophobic properties. The self-similar double-layer structure in its layered structure has excellent self-cleaning ability. The rolling effect of water droplets can be used to remove sand and dust on the surface of the car paint protection film, thereby achieving self-cleaning.

[0023] The utility model discloses a car paint protection film with self-repairing super-hydrophobic properties. The construction of a self-similar double-layer structure in the layered structure is conducive to the self-repair of the coating after damage and improves the mechanical stability and weather resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the layered structure of a car paint protection film with self-healing superhydrophobic properties.

[0025] In the figure: protective film layer 1, composite super-hydrophobic coating 2 with self-similar double-layer structure, TPU substrate layer 3, pressure-sensitive adhesive layer 4, release film layer 5. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention. Example 1:

[0027] like Figure 1 As shown, as an embodiment of the present invention, a car paint protection film with self-repairing super-hydrophobic properties provided in this embodiment has a layered structure comprising: a protective film layer 1, a self-similar double-layer composite super-hydrophobic coating 2, a TPU substrate layer 3, a pressure-sensitive adhesive layer 4 and a release film layer 5, which are compounded in sequence; wherein the self-similar double-layer composite super-hydrophobic coating 2 comprises a surface nano-SiO2 coating and a bottom EP / silicone glue / nano-SiO2 coating.

[0028] The protective film layer in this embodiment is a PET protective film (Yihua Dongli, G01) with a thickness of 12 μm.

[0029] The thickness of the composite super-hydrophobic coating with a self-similar double-layer structure described in this embodiment is 6 μm.

[0030] The TPU substrate layer in this embodiment uses an aliphatic TPU base film (Argotec 49510) with a surface hardness of 93A, a visible light transmittance of 92%, an elongation at break of 550%, a haze of 1.0%, and a thickness of 100 μm.

[0031] The pressure-sensitive adhesive layer in this embodiment is made of acrylic pressure-sensitive adhesive (Henkel, Loctite 8087), with a visible light transmittance of 92% and a thickness of 10 μm.

[0032] The release film layer in this embodiment is a white PET release film (Toray, XZ31SR) with a haze of 73%, a release force of 10 g / inch, and a thickness of 23 μm.

[0033] The above-mentioned method for preparing a car paint protection film with self-repairing superhydrophobic properties can adopt a process of first coating a pressure-sensitive adhesive layer and then coating a composite superhydrophobic coating liquid with a self-similar double-layer structure. The coating method is preferably selected from roller coating, slit coating or comma blade coating.

[0034] It specifically includes the following steps:

[0035] Step 1: Preparation of a composite super-hydrophobic coating with a self-similar double-layer structure

[0036] Epoxy resin (E-51, Shandong Yousuo Chemical Technology Co., Ltd.) and its curing agent (T-31, Shandong Yousuo Chemical Technology Co., Ltd.) (m(epoxy resin) : m(curing agent) = 4:1) were added to anhydrous ethanol (analytical grade, Chongqing Chuandong Chemical (Group) Co., Ltd.). The epoxy resin was fully dispersed in the anhydrous ethanol by magnetic stirring for 20 min and ultrasonic dispersion for 15 min at room temperature. Neutral silicone rubber (Heshan Honghua Industrial Co., Ltd.) was then added and magnetically stirred for 30 min. Nano-SiO2 (R972, Evonik Degussa, Germany) (m(epoxy resin) : m(neutral silicone rubber) : m(nano-SiO2) = 0.4:1:2) was then added and magnetically stirred for 10 min and ultrasonically dispersed for 10 min to achieve complete dissolution, thereby obtaining bottom layer solution A. The nano-SiO2 was then added to anhydrous ethanol and magnetically stirred for 10 min and ultrasonically dispersed for 10 min to achieve complete dissolution, thereby obtaining surface layer solution B.

[0037] Step 2: Apply pressure-sensitive adhesive layer

[0038] An acrylic pressure-sensitive adhesive (Henkel, Loctite 8087) coating solution was applied to a 23 μm white PET release film (Toray, XZ31SR) and dried at 110°C for 2 minutes to form a 10 μm thick pressure-sensitive adhesive layer. This layer was then applied to one side of a 100 μm aliphatic TPU substrate (Argotec 49510).

[0039] Step 3: Applying a self-similar double-layer composite super-hydrophobic coating

[0040] In step 2, solution A was evenly coated on the other side of the aliphatic TPU substrate and cured at room temperature to obtain a bottom EP / silicone adhesive / nano-SiO2 coating. Solution B was then applied on the bottom EP / silicone adhesive / nano-SiO2 coating. After the anhydrous ethanol evaporated naturally, a layered superhydrophobic coating with self-healing properties was obtained. The thickness after drying was 6 μm.

[0041] Step 4: Composite protective film layer

[0042] In step 3, the surface of the composite super-hydrophobic coating with a self-similar double-layer structure was covered with a 12 μm PET protective film (Yihua Dongli, G01).

[0043] Step 5: Ripening

[0044] The semi-finished product in step 4 is placed in a 50° C. curing chamber for 72 hours to obtain the automotive paint protection film of the present invention. Example 2:

[0045] As a second embodiment of the present invention, a car paint protection film with self-repairing super-hydrophobic properties provided in this embodiment has a layered structure and a preparation method that are substantially the same as those in Example 1.

[0046] However, the PET protective film (Yihua Toray, G01) used as the protective film layer in this example has a thickness of 45 μm. The thickness of the self-similar double-layer composite superhydrophobic coating in this example is 10 μm. The aliphatic TPU base film (Argotec 49510) used as the TPU substrate layer in this example has a thickness of 200 μm. The pressure-sensitive adhesive layer in this example also uses acrylic pressure-sensitive adhesive (Henkel, Loctite 8087), with a dry adhesive thickness of 30 μm. The white PET release film (Toray, XZ31SR) used as the release film layer in this example has a thickness of 62 μm. Example 3:

[0047] As the third embodiment of the present invention, a car paint protection film with self-repairing super-hydrophobic properties is provided in this embodiment. Similarly, its layered structure and preparation method are roughly the same as those in Example 1.

[0048] However, the PET protective film (Yihua Toray, G01) used as the protective film layer in this example has a thickness of 75 μm. The thickness of the self-similar double-layer composite superhydrophobic coating in this example is 15 μm. The aliphatic TPU base film (Argotec 49510) used as the TPU substrate layer in this example has a thickness of 300 μm. The pressure-sensitive adhesive layer in this example also uses acrylic pressure-sensitive adhesive (Henkel, Loctite 8087), with a dry adhesive thickness of 50 μm. The white PET release film (Toray, XZ31SR) used as the release film layer in this example has a thickness of 100 μm. Example 4:

[0049] As the fourth embodiment of the present invention, a car paint protection film with self-repairing super-hydrophobic properties is provided in this embodiment. Similarly, its layered structure and preparation method are roughly the same as those in Example 1.

[0050] However, in the method for preparing a self-repairing super-hydrophobic automotive paint protection film in this embodiment, in the preparation process of the self-similar double-layer composite super-hydrophobic coating described in step 1, m (epoxy resin): m (neutral silicone glue): m (nano-SiO2) = 0.8:1:2. Example 5:

[0051] As the fifth embodiment of the present invention, a car paint protection film with self-repairing super-hydrophobic properties is provided in this embodiment. Similarly, its layered structure and preparation method are roughly the same as those in Example 1.

[0052] However, in the method for preparing a self-repairing super-hydrophobic automotive paint protection film in this embodiment, in the preparation process of the self-similar double-layer composite super-hydrophobic coating described in step 1, m (epoxy resin): m (neutral silicone glue): m (nano-SiO2) = 1.2:1:2.

[0053] As shown in Table 1, the water contact angle (CA) of the surface nano-SiO2 layer of the self-similar double-layer composite superhydrophobic coatings in each example (Examples 1 to 5) reached 156°±1.8° after curing at room temperature. Even after heating at 130°C, the CA remained at 156°±1.8°. This is because the numerous micro- / nano-emulsions in the nano-SiO2 coating are uniformly arranged in a network structure, which is unaffected by the 130°C high temperature. For the bottom composite coating, when the ratio of m(epoxy resin):m(neutral silicone gel):m(nano-SiO2) is 0.4:1:2 (Examples 1-3), the CA reached 138°±1.6° after room temperature curing, and 157.5°±2° after heating at 130°C. When the ratio of m(epoxy resin):m(neutral silicone adhesive):m(nano-SiO2)=0.8:1:2 (Example 4), the CA of the coating after room temperature curing dropped significantly, reaching only 125°±1°. After heating at 130°C, the CA of the coating reached 157°±1.2°. When the ratio of m(epoxy resin):m(neutral silicone adhesive):m(nano-SiO2)=1.2:1:2 (Example 5), the CA of the coating after room temperature curing dropped again significantly, reaching only 117°±1°. After heating at 130°C, the CA of the coating reached 150°±0.8°. This is because the addition of EP as an adhesive causes some nano-SiO2 to agglomerate at room temperature. This agglomeration becomes more pronounced with increasing EP addition, hindering the migration of low-surface-energy species, which can be accelerated by high-temperature heating.

[0054] Table 1

[0055]

[0056] As can be seen from Table 2, after 10 wear cycles, the CA of the surface nano-SiO2 coating can still reach 150°±0.8°. After 30 wear cycles, the CA is maintained at 125°±1°. At this time, the surface nano-SiO2 coating is completely worn away, exposing the underlying EP / silicone adhesive / SiO2 composite coating. Subsequently, after the exposed underlying EP / silicone glue / nano-SiO2 composite coating was heated at 130 °C for 1 h, the CA of the EP / silicone glue / nano-SiO2 composite coating in Examples 1-3 changed from 138°±1.6° to 157.5°±2°, the CA of the EP / silicone glue / nano-SiO2 composite coating in Example 4 changed from 125°±1° to 157°±1.2°, and the CA of the EP / silicone glue / nano-SiO2 composite coating in Example 5 changed from 117°±1° to 150°±0.8°, indicating that the coating has restored its superhydrophobic ability.

[0057] Table 2

[0058]

[0059] As can be seen from Table 3, the surface nano-SiO2 layer, the EP / silicone adhesive / nano-SiO2 composite coating without heating after surface damage, and the EP / silicone adhesive / nano-SiO2 composite coating with heating after surface damage were immersed in solutions with pH values ​​of 2 to 12 for 1 h, respectively. As the pH value increased from 2 to 6, the CA of the surface SiO2 layer in each example (Examples 1 to 5) increased from 151°±1.2° to 154°±1.2°. The CA of the EP / silicone adhesive / nano-SiO2 composite coating without heating after surface layer destruction in Examples 1-3 increased from 135°±1.2° to 137°±1.4°. The CA of the EP / silicone adhesive / nano-SiO2 composite coating without heating after surface layer destruction in Example 4 increased from 122°±1.4° to 124°±1.6°. The CA of the EP / silicone adhesive / nano-SiO2 composite coating without heating after surface layer destruction in Example 5 increased from 114°±1.0° to 116°±1.6°. The CA of the EP / silicone adhesive / nano-SiO2 composite coating without heating after surface layer destruction in Examples 1-3 increased from 1 The CA of the EP / silicone adhesive / nano-SiO2 composite coating heated after surface damage in Example 4 increased from 153.5°±1.8° to 157.7°±0.5°, while the CA of the EP / silicone adhesive / nano-SiO2 composite coating heated after surface damage in Example 4 increased from 153°±1.6° to 156°±1°, and the CA of the EP / silicone adhesive / nano-SiO2 composite coating heated after surface damage in Example 5 increased from 146°±0.6° to 150°±0.2°. This can be explained by the high surface roughness of the coating and the micro / nano rough structure that leads to the formation of an air film on the coating surface, which hinders the contact between the solution and the coating surface.

[0060] The prepared coating was placed in a solution with a pH of 2 to further verify its acid resistance. After immersion in the solution with a pH of 2 for 8 h, the surface nano-SiO2 layer, the EP / silicone adhesive / nano-SiO2 composite coating without heating after surface damage, and the EP / silicone adhesive / nano-SiO2 composite coating with heating after surface damage, the CA of the surface nano-SiO2 in Examples 1 to 5 were all 150°±1°, the CA of the EP / silicone adhesive / nano-SiO2 composite coating without heating after surface damage in Examples 1-3 was 134°±1.6°, the CA of the EP / silicone adhesive / nano-SiO2 composite coating without heating after surface damage in Example 4 was 121°±1.4°, the CA of the EP / silicone adhesive / nano-SiO2 composite coating without heating after surface damage in Example 5 was 114°±1.2°, and the CA of the EP / silicone adhesive / nano-SiO2 composite coating without heating after surface damage in Examples 1-3 was 134°±1.6°. The CA of the EP / silicone adhesive / nano-SiO2 composite coating heated after surface damage in Example 4 is 152.5°±1.2°, while the CA of the EP / silicone adhesive / nano-SiO2 composite coating heated after surface damage in Example 5 is 145°±1.8°, which indicates that the prepared coating has good acid resistance.

[0061] In an alkaline environment, the CA of the surface nano-SiO2 layer and the EP / silicone glue / nano-SiO2 composite coating without heating after surface damage decreased rapidly. As the pH value increased from 8 to 12, the CA of the surface nano-SiO2 in Examples 1 to 5 was 101°±1.6°, the CA of the EP / silicone glue / nano-SiO2 composite coating without heating after surface damage in Examples 1-3 was 81.5°±1.6°, the CA of the EP / silicone glue / nano-SiO2 composite coating without heating after surface damage in Example 4 was 81°±1.4°, and the CA of the EP / silicone glue / nano-SiO2 composite coating without heating after surface damage in Example 5 was 76°±1.0°. However, the double-layer super-hydrophobic coating destroyed by the alkaline solution lost its super-hydrophobicity after 130 The superhydrophobicity of the coating can be restored by heating at 140°C. In Examples 1-3, the CA of the EP / silicone adhesive / nano-SiO2 composite coating heated after surface damage was 153.5°±1.5°. In Example 4, the CA of the EP / silicone adhesive / nano-SiO2 composite coating heated after surface damage was 153°±1.2°. And in Example 5, the CA of the EP / silicone adhesive / nano-SiO2 composite coating heated after surface damage was 149°±1.0°. This can be explained by the chemical reaction between the alkaline solution and the coating surface, which causes the low-surface-energy substances on the coating surface to decompose. After heating, the low-surface-energy substances within the coating migrate to the surface, repairing the damaged areas.

[0062] Table 3

[0063]

[0064] The test methods for each performance in the above table are as follows:

[0065] The water contact angle of the sample was measured using a contact angle meter. Five measurements were taken at different locations on the sample, and the average value was taken. The sample was placed under a 50 g weight and dragged across 1500 grit sandpaper at a constant speed of 4-5 mm / s. Each sliding cycle was 10 cm, and the change in the water contact angle was measured. The sample was placed in solutions with different pH values, and the change in the water contact angle was measured every hour.

[0066] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, any technical solution that is the same or similar to that of the present application falls within the scope of protection of the present invention.

Claims

1. A car paint protection film with self-repairing super-hydrophobic properties, characterized by a layered The structure includes: a composite super-hydrophobic coating with a self-similar double-layer structure, a TPU substrate layer, a pressure-sensitive adhesive layer and a release film layer, which are compounded in sequence; wherein the composite super-hydrophobic coating with a self-similar double-layer structure includes a surface nano-SiO2 coating and a bottom EP / silicone adhesive / nano-SiO2 coating.

2. The self-repairing super-hydrophobic automotive paint protection film according to claim 1, characterized in that: The thickness of the composite super-hydrophobic coating with a self-similar double-layer structure is 6 μm-15 μm.

3. The self-repairing super-hydrophobic automotive paint protection film according to claim 1, characterized in that: The TPU substrate layer is an aliphatic TPU substrate layer with a thickness of 100 μm-300 μm.

4. The self-repairing super-hydrophobic automotive paint protection film according to claim 1, characterized in that: The pressure-sensitive adhesive layer is an acrylic pressure-sensitive adhesive layer or a polyurethane pressure-sensitive adhesive layer, and has a thickness of 10 μm-50 μm.

5. The self-repairing super-hydrophobic automotive paint protection film according to claim 1, characterized in that: The release film layer is a PET release film layer with a thickness of 23 μm-100 μm.

6. The self-repairing super-hydrophobic automotive paint protection film according to claim 1, characterized in that: The invention also comprises a protective film layer which is compounded onto the surface of the composite super-hydrophobic coating with a self-similar double-layer structure.

7. The self-repairing super-hydrophobic automotive paint protection film according to claim 6, characterized in that: The protective film layer is a PET protective film with a thickness of 12 μm-75 μm.

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