Automobile paint surface protective film with self-repairing, hydrophobic, anti-doodling and wear-resisting properties

Abstract

The utility model discloses an automobile paint surface protective film, in particular to an automobile paint surface protective film with self-repairing, hydrophobic, anti-doodling and wear-resisting properties, which has a layered structure and comprises a release film layer, a pressure-sensitive adhesive layer, a TPU (thermoplastic polyurethane) substrate layer, a self-repairing coating and a UV (ultraviolet) photocuring fluorosilicone resin modified easy-to-clean coating. According to the utility model, the technical problem that the surface of the automobile paint surface protective film has self-repairing, hydrophobic, anti-doodling and wear-resisting properties is solved. The self-repairing coating has excellent self-repairing performance, and surface scratches can be 100% repaired through heating (60 DEG C); the anti-doodling performance is excellent, and an oily marking pen and printing ink can shrink on the surface and can be easily wiped clean; the coating has excellent self-cleaning performance, and when water drops slide down from the surface, dust on the surface can be easily taken away without leaving traces; and in addition, the wear-resisting property is excellent, and the surface pencil hardness grade is 2H.

Description

Technical Field

[0001] The utility model relates to an automobile paint protection film, in particular to an automobile paint protection film with self-repairing, hydrophobic, anti-graffiti and wear-resistant properties. 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 layered structure of existing automotive paint protection films generally consists of a pressure-sensitive adhesive layer, a TPU substrate layer, and a self-healing coating, most often made of polyurethane. Furthermore, some high-end automotive paint protection films are designed to achieve both super-hydrophobic and stain-resistant properties, easily removing stains such as dust, bird droppings, oil, and water spots. A micro-nanoscale, easy-to-clean coating forms on the self-healing coating. However, existing automotive paint protection films, while possessing self-healing properties, fail to achieve simultaneous hydrophobicity, anti-graffiti, and wear resistance.

[0004] Li Zhigang, Lü Chaolong, et al. proposed the preparation and performance study of a fluorosilicone resin-modified UV-curable, easy-to-clean coating (SURFACE TECHNOLOGY, Vol. 52, No. 7, July 2023). The abstract states: Objective: To prepare a UV-curable, easy-to-clean, smooth coating with hydrophobic, anti-graffiti, and abrasion-resistant properties using polyurethane acrylate as a matrix resin and fluorosilicone resin as an additive. Method: First, a trifunctional acrylate monomer (TATES) containing a siloxane structure was synthesized by urethanization. Then, a series of fluorosilicone resins (AFSRs) were prepared by a hydrolysis-polycondensation method using 1H,1H,2H,2H-perfluorooctyltrimethoxysilane (POTS), propyltrimethoxysilane (MPMS), and TATES as raw materials. Finally, AFSRs were added to the polyurethane acrylate resin and cured by UV light to obtain a fluorosilicone resin-modified polyurethane easy-to-clean coating. The effects of AFSR addition on the wettability, self-cleaning, anti-graffiti, and wear resistance of the coating were systematically investigated. Results: When AFSR (92.6% fluorine content, by mole fraction) was added to PUA at a 2.5% concentration, the coating exhibited contact angles of 112.6° for water and 66.3° for hexadecane, respectively, and very low roll-off angles for water and hexadecane. As the AFSR addition increased from 0.5% to 2.5%, the antifouling properties gradually improved, with significant oil-based marker shrinkage and self-cleaning effects. The easy-to-clean coating maintained good shrinkage and sustained antifouling properties after 3000 friction cycles, demonstrating excellent wear resistance. Conclusion: Increasing the AFSR addition increased the fluorine-silicon content and decreased the surface energy of the coating, resulting in high contact angles and low roll-off angles. The coating exhibited optimal antifouling properties when the AFSR addition was 2.5%. The introduction of trifunctional TATES and the construction of a three-dimensional silicone resin network improve the hardness of the coating, giving the coating excellent durable antifouling properties.

[0005] Therefore, the applicant proposed the present utility model. Summary of the Invention

[0006] The purpose of the utility model is to solve the above-mentioned deficiencies in the prior art and to provide a car paint protection film having a surface that has self-repairing, hydrophobic, anti-graffiti and wear-resistant properties.

[0007] In order to achieve the above objectives, the utility model designs a car paint protection film with self-repairing, hydrophobic, anti-graffiti and wear-resistant properties, whose layered structure includes: a release film layer, a pressure-sensitive adhesive layer, a TPU substrate layer, a self-repairing coating and a UV light-cured fluorosilicone resin modified easy-to-clean coating.

[0008] In the above-mentioned car paint protection film having self-repairing, hydrophobic, anti-graffiti and wear-resistant properties, the thickness of the UV light-curable fluorosilicone resin modified easy-to-clean coating in its layered structure is preferably 0.2 μm-0.5 μm.

[0009] The thickness of the UV light-curing fluorosilicone resin modified easy-to-clean coating is controlled between 0.2μm and 0.5μm, that is, at the nanometer level. Once scratches appear on the coating, they cannot be directly observed by the naked eye, and the impact on the surface finish of the automotive paint protection film is limited. When the underlying self-repairing coating of the UV light-curing fluorosilicone resin modified easy-to-clean coating also appears scratched, it can itself achieve self-repairing properties, thereby ensuring that the surface finish of the automotive paint protection film remains long-term while also giving the surface stable hydrophobic, anti-graffiti and wear-resistant properties.

[0010] The thickness of the self-repairing coating in the layered structure of the above-mentioned automobile paint protection film with self-repairing, hydrophobic, anti-graffiti and wear-resistant properties is preferably 6 μm-15 μm.

[0011] The above-mentioned automotive paint protection film with self-repairing, hydrophobic, anti-graffiti and wear-resistant properties, the TPU substrate layer in its 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.

[0012] The above-mentioned automobile paint protection film with self-repairing, hydrophobic, anti-graffiti and wear-resistant properties, the pressure-sensitive adhesive layer in its layered structure 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.

[0013] The above-mentioned automotive paint protection film with self-repairing, hydrophobic, anti-graffiti and wear-resistant properties, in which the release film layer in the layered structure 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 20g / inch, and the thickness is preferably 23μm-100μm.

[0014] The above-mentioned car paint protection film with self-repairing, hydrophobic, anti-graffiti and wear-resistant properties preferably further comprises a protective film layer in its layered structure, which is composited onto the surface of the UV light-curable fluorosilicone resin modified easy-to-clean coating.

[0015] The protective film layer can protect the UV light-curing fluorosilicone resin modified easy-to-clean coating to the greatest extent, so as to avoid the situation where "the UV light-curing fluorosilicone resin modified easy-to-clean coating is scratched and worn during packaging, transportation and construction."

[0016] The protective film layer is further preferably a PET protective film with a thickness of 12 μm-75 μm.

[0017] Compared with the prior art, the present invention provides a car paint protection film with self-repairing, hydrophobic, anti-graffiti and wear-resistant properties, and has the following technical effects:

[0018] This car paint protection film has excellent self-repairing properties, and surface scratches can be 100% repaired by heating (60°C).

[0019] The car paint protection film has excellent anti-graffiti properties, and oil-based markers and inks can shrink on the surface and can be easily wiped clean.

[0020] This car paint protection film has excellent self-cleaning properties. When water droplets slide off the surface, they can easily remove the dust on the surface without leaving any traces.

[0021] In addition, the car paint protection film also has excellent wear resistance, with a pencil hardness rating of 2H. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the layered structure of a car paint protection film with self-healing, hydrophobic, anti-graffiti and wear-resistant properties.

[0023] In the figure: release film layer 1, pressure-sensitive adhesive layer 2, TPU substrate layer 3, self-repairing coating 4, UV light-cured fluorosilicone resin modified easy-to-clean coating 5, and protective film layer 6. DETAILED DESCRIPTION

[0024] 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:

[0025] like Figure 1 As shown, as an embodiment of the present invention, a car paint protection film with self-repairing, hydrophobic, anti-graffiti and wear-resistant properties is provided in this embodiment, and its layered structure includes: a release film layer 1, a pressure-sensitive adhesive layer 2, a TPU substrate layer 3, a self-repairing coating 4, a UV light-cured fluorosilicone resin modified easy-to-clean coating 5 and a protective film layer 6.

[0026] The protective film layer in this embodiment is a PET protective film (Yihua Dongli, G01) with a thickness of 12 μm.

[0027] The thickness of the UV light-curable fluorosilicone resin modified easy-to-clean coating in this embodiment is 0.2 μm.

[0028] The thickness of the self-repairing polyurethane coating in this embodiment is 6 μm.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] The above-mentioned method for preparing a car paint protection film with self-repairing, hydrophobic, anti-graffiti and wear-resistant properties can adopt a process of first coating a pressure-sensitive adhesive layer and then coating a self-repairing coating and a UV light-cured fluorosilicone resin modified easy-to-clean coating. The coating method is preferably selected from roller coating, slit coating or comma blade coating.

[0033] It specifically includes the following steps:

[0034] Step 1: Preparation of UV-curable fluorosilicone resin modified easy-to-clean coating solution

[0035] 1.1 Synthesis of trifunctional acrylate monomer containing siloxane structure (TATES)

[0036] A 100 mL four-well container equipped with a mechanical stirrer, thermometer, reflux condenser, and digital syringe was added.

[0037] To a four-necked round-bottom flask, 10.27 g (0.05 mol) of 3-isocyanatopropyltrimethoxysilane (IPTES, 97.0%) (Shanghai MacLean Biochemical Technology Co., Ltd.), 10% of methyl ethyl ketone (China National Pharmaceutical Group Co., Ltd.), 0.1% of 4-methoxyphenol (MEHQ, 99%) (Shanghai MacLean Biochemical Technology Co., Ltd.), and 0.1% of dibutyltin dilaurate (DBTDL, 95%) (Shanghai MacLean Biochemical Technology Co., Ltd.) were added. After mixing thoroughly, the heating device was heated to 55°C. Then, 14.91 g (0.05 mol) of pentaerythritol triacrylate (PETA) (Aladdin Co., Ltd.) was loaded into a CNC syringe and added dropwise to the four-necked round-bottom flask over 2.5 hours. After the addition was complete, the reaction was continued for 12 hours. Fourier transform infrared (FTIR) spectroscopy showed a peak at 3460 cm ‒1 The hydroxyl peak at 147 nm disappeared, and the product was washed with n-hexane three times to obtain TATES monomer (yield 78.52%).

[0038] 1.2 Synthesis of fluorosilicone resin (AFSR)

[0039] A 100 mL four-necked flask equipped with a mechanical stirrer, thermometer, reflux condenser, and a digital syringe was added.

[0040] A round-bottom flask was charged with 1H,1H,2H,2H-perfluorooctyltrimethoxysilane (POTS, 0.05 mol) (Shanghai MacLean Biochemical Technology Co., Ltd.), TATES monomer (0.004 mol), isopropyl alcohol (5 g) (China National Pharmaceutical Group Co., Ltd.), and MEHQ (1% in isopropyl alcohol, 0.05 g). The mixture was then stirred and heated to 50°C. A small amount of concentrated hydrochloric acid (100 μL) and 2.16 g (0.12 mol) of deionized water were then added dropwise to the flask over 1 hour using a CNC syringe. The temperature was then raised to 60°C and the reaction was maintained for 5 hours. 1.46 g (0.009 mol) of hexamethyldisiloxane (MM) (Aladdin Co., Ltd.) was then added to the flask, and the temperature was raised to 70°C and maintained for 2 hours. After the reaction, the product was washed three times with deionized water, and then the solvent and low-boiling point residues in the organic phase were removed at 50 °C / 130 mmHg to obtain clear and transparent fluorosilicone resin (AFSR).

[0041] 1.3 Synthesis of polyurethane acrylate (PUA)

[0042] Isophorone diisocyanate was added to a reaction vessel equipped with a stirrer, a serpentine condenser and a thermometer.

[0043] The reaction mixture was slowly heated to 50°C, and polyethylene glycol (PEG, Mn=300) (Aladdin Co., Ltd.) and 0.1% dibutyltin dilaurate (DBTDL, 95%) were added to a four-necked flask. The mixture was added dropwise for 0.5 h and then kept warm for 0.5 h. During the reaction, ethyl acetate (China National Pharmaceutical Group Co., Ltd.) was added to adjust the viscosity. The temperature was then raised to 60°C, and pentaerythritol triacrylate (PETA) (Aladdin Co., Ltd.), 0.1% DBTDL, and 0.1% MEHQ were added. The reaction was kept warm until the end point. Trimethylolpropane triacrylate (TMPTA) (Aladdin Co., Ltd.) was then added. After stirring, the ethyl acetate was removed by vacuum distillation at 40°C, resulting in a solvent-free polyurethane acrylate (PUA) resin, in which TMPTA accounted for 20% of the total weight of the PUA.

[0044] 1.4 Preparation of UV light-curable fluorosilicone resin modified easy-to-clean coating coating liquid

[0045] Weigh a certain amount of polyurethane acrylate (PUA) resin, add 2.5% fluorosilicone resin (AFSR) and 3.0% 2-hydroxy-2-methyl-1-phenyl-1-propanone (1173), and mix well in the dark.

[0046] Step 2: Preparation of self-repairing polyurethane coating solution

[0047] 860 parts of polycaprolactone polyol resin (Daicel ChemTech, PLACCEL 210CP), 20 parts of stannous isooctanoate (Aladdin Co., Ltd.), 15 parts of UV absorber TINUVIN 400 (BASF), 15 parts of light stabilizer TINUVIN 292 (BASF) and 10 parts of leveling agent BYK 320 (BYK) were added to 1000 parts of ethyl acetate in sequence, and finally 150 parts of toluene diisocyanate (BASF) was added and stirred for 30 minutes to mix evenly.

[0048] Step 3: Apply pressure-sensitive adhesive layer

[0049] 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).

[0050] Step 4: Apply self-repairing polyurethane coating

[0051] In step 3, the other side of the aliphatic TPU substrate is coated with the polyurethane coating liquid prepared in step 2, and the curing conditions are 120° C. for 2 minutes. After drying, the thickness of the self-repairing coating is 6 μm.

[0052] Step 5: Apply UV light-curing fluorosilicone resin modified easy-to-clean coating

[0053] In step 4, the surface of the self-repairing coating was coated with the UV-curable fluorosilicone resin modified easy-to-clean coating solution prepared in step 1. After standing at room temperature for 1 h, the coating was irradiated with a high-pressure mercury lamp (1 kW) for 100 s (wavelength 250-410 nm, energy density 2600 mJ / cm) at a distance of 25 cm from the substrate. 2 ), initiate free radical polymerization, and the thickness of the cured film is 0.2μm.

[0054] Step 6: Composite protective film layer

[0055] In step 5, the surface of the UV-cured fluorosilicone resin modified easy-to-clean coating was covered with a 12 μm PET protective film (Yihua Toray, G01).

[0056] Step 7: Ripening

[0057] The semi-finished product in step 6 is placed in a 50° C. curing chamber for 72 hours to obtain the automotive paint protection film of the present invention. Example 2:

[0058] As a second embodiment of the present invention, this embodiment provides an automobile paint protection film with self-repairing, hydrophobic, anti-graffiti and wear-resistant properties, and its layered structure and preparation method are roughly the same as those in Example 1.

[0059] However, the PET protective film (Yihua Toray, G01) used as the protective film layer in this embodiment has a thickness of 45 μm. The thickness of the UV-curable fluorosilicone resin-modified easy-to-clean coating in this embodiment is 0.3 μm. The thickness of the self-healing coating in this embodiment is 10 μm. The aliphatic TPU base film (Argotec 49510) used as the TPU substrate layer in this embodiment has a thickness of 200 μm. The pressure-sensitive adhesive layer in this embodiment 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 embodiment has a thickness of 62 μm. Example 3:

[0060] As a third embodiment of the present invention, this embodiment provides a car paint protection film with self-repairing, hydrophobic, anti-graffiti and wear-resistant properties, and its layered structure and preparation method are roughly the same as those in Example 1.

[0061] However, the PET protective film (Yihua Toray, G01) used as the protective film layer in this embodiment has a thickness of 75 μm. The thickness of the UV-curable fluorosilicone resin-modified easy-to-clean coating in this embodiment is 0.5 μm. The thickness of the self-healing coating in this embodiment is 15 μm. The aliphatic TPU base film (Argotec 49510) used as the TPU substrate layer in this embodiment has a thickness of 300 μm. The pressure-sensitive adhesive layer in this embodiment 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 embodiment has a thickness of 100 μm.

[0062] Comparative Example 1:

[0063] A method for preparing an automobile paint protection film comprises the following steps:

[0064] (1) Preparation of polyurethane coating liquid

[0065] 860 parts of polycaprolactone polyol resin (Daicel ChemTech, PLACCEL 210CP), 20 parts of stannous isooctanoate (Aladdin Co., Ltd.), 15 parts of UV absorber TINUVIN 400 (BASF), 15 parts of light stabilizer TINUVIN 292 (BASF) and 10 parts of leveling agent BYK 320 (BYK) were added to 1000 parts of ethyl acetate in sequence, and finally 150 parts of toluene diisocyanate (BASF) was added and stirred for 30 minutes to mix evenly.

[0066] (2) Coating pressure-sensitive adhesive layer

[0067] A transparent acrylic pressure-sensitive adhesive (Henkel, Loctite 8087) was coated onto 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 covered with a 100 μm aliphatic TPU (Argotec 49510).

[0068] (3) Applying polyurethane coating

[0069] In the second step, the other side of the aliphatic TPU substrate was coated with the polyurethane coating liquid prepared in the first step, and the curing conditions were 120°C for 2 minutes. The thickness after drying was 6 μm. Finally, a 12 μm thick PET protective film (Yihua Toray, G01) was covered on the surface.

[0070] (4) Late ripening

[0071] The semi-finished product in the third step is placed in a 50°C curing chamber for 72 hours to obtain the existing conventional automobile paint protection film.

[0072] Comparative Example 2:

[0073] A method for preparing an automobile paint protection film comprises the following steps:

[0074] (1) Preparation of polyurethane coating liquid

[0075] 1200 parts of polycarbonate polyol resin (Daicel ChemTech, PLACCEL 220CPB), 26 parts of stannous isooctanoate (Aladdin Co., Ltd.), 20 parts of UV absorber TINUVIN 400 (BASF), 20 parts of light stabilizer TINUVIN 292 (BASF) and 13 parts of leveling agent BYK 320 (BYK) were added to 1200 parts of ethyl acetate in sequence, and finally 100 parts of hexamethylene diisocyanate (BASF) was added and stirred for 30 minutes to mix evenly.

[0076] (2) Coating pressure-sensitive adhesive layer

[0077] A transparent acrylic pressure-sensitive adhesive (Ashland, 9510H) was coated onto 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 covered with a 100 μm aliphatic TPU (Argotec 49510).

[0078] (3) Applying polyurethane coating

[0079] In the second step, the other side of the aliphatic TPU substrate was coated with the polyurethane coating liquid prepared in the first step, and the curing conditions were 120°C for 2 minutes. The thickness after drying was 6 μm. Finally, a 12 μm thick PET protective film (Yihua Toray, G01) was covered on the surface.

[0080] (4) Late maturation

[0081] The semi-finished product in the third step is placed in a 50°C curing chamber for 72 hours to obtain the existing conventional automobile paint protection film.

[0082] The following table shows the test data of the water static contact angle, roll-off angle, scratch self-repair rate and pencil hardness of the automotive paint protection films provided in Examples 1-3 and Comparative Examples 1 and 2.

[0083] Examples Water static contact angle (°) Roll angle (°) Self-repair rate of scratches (%) Pencil hardness Example 1 112.6 26.5 100 2H Example 2 112.6 26.5 100 2H Example 3 112.6 26.5 100 2H Comparative Example 1 95 54 100 1H Comparative Example 2 98 51 100 1H

[0084] At the same time, the surface layers of the automotive paint protection films provided in the above embodiments and comparative examples were tested for ink shrinkage performance, self-cleaning performance, and wear resistance.

[0085] The test results of ink shrinkage performance are as follows:

[0086] On the self-healing polyurethane coating of the automotive paint protection films provided in Comparative Examples 1 and 2, the ink did not shrink at all and could not be directly wiped off. However, on the UV-curable fluorosilicone resin-modified easy-to-clean coating of the automotive paint protection films provided in Examples 1-3, the ink shrank rapidly. After 30 minutes, the ink stopped shrinking further and formed bead-like droplets, achieving maximum shrinkage and allowing direct wipe-off.

[0087] The self-cleaning performance test results are as follows:

[0088] On the self-healing polyurethane coating of the automotive paint protection films provided in Comparative Examples 1 and 2, water droplets wetted dust and left traces of contamination as they slid down the coating. However, on the UV-curable fluorosilicone resin-modified easy-to-clean coating of the automotive paint protection films provided in Examples 1-3, water droplets carried away contaminants without leaving any traces.

[0089] The test methods for the data and performance in the above table are as follows:

[0090] Water static contact angle

[0091] Select a piece of automotive paint protection film, remove the release film and protective film, and apply it to a 3mm thick transparent glass. Use an SDC-200S contact angle tester to measure the static water contact angle of the film. Measure each sample five times and record the calculated values.

[0092] Roll-off angle of automotive paint protection film

[0093] Select a piece of car paint protection film, remove the release film and protective film, and stick it on a 3mm transparent glass. Place a droplet on the surface, then tilt the sample stage until the droplet begins to move, and record the angle at which the droplet begins to move, i.e., the surface rolling angle.

[0094] Self-repair performance

[0095] Select a piece of car paint protection film, tear off the release film and protective film, wet-apply it to a black painted panel, slide 500g of #0000 steel wool back and forth on the surface of the paint protection film three times, then place the painted panel in a 60℃ oven for 30 minutes to observe whether the scratches are repaired.

[0096] Ink shrinkage properties

[0097] Select a piece of car paint protection film, remove the release film and protective film, write on the surface of the car paint protection film with an oil-based marker (ZEBRA marker), and observe the shrinkage of the writing on the surface to test the anti-fouling performance of the coating.

[0098] Self-cleaning performance

[0099] Select a piece of car paint protection film, tear off the release film and protective film, spread dust flat on the inclined surface of the car paint protection film, then drop deionized water on the inclined surface of the car paint protection film and observe how the pollutants are removed by water to test the self-cleaning performance of the coating.

[0100] Pencil hardness

[0101] The pencil hardness of the surface coating of the automotive paint protection film is tested according to GB / T 6739-2006 "Paints and varnishes - Determination of paint film hardness by pencil method".

[0102] 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, hydrophobic, anti-graffiti and wear-resistant properties, characterized by The layered structure includes: a release film layer, a pressure-sensitive adhesive layer, a TPU substrate layer, a self-healing coating, and a UV-curable fluorosilicone resin modified easy-to-clean coating.

2. The automotive paint protection film having self-repairing, hydrophobic, anti-graffiti and wear-resistant properties according to claim 1, characterized in that: The thickness of the UV light-cured fluorosilicone resin modified easy-to-clean coating is 0.2 μm-0.5 μm.

3. The automotive paint protection film with self-repairing, hydrophobic, anti-graffiti and wear-resistant properties according to claim 1, characterized in that: The thickness of the self-repairing coating is 6 μm-15 μm.

4. The automotive paint protection film having self-repairing, hydrophobic, anti-graffiti and wear-resistant properties 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.

5. The automotive paint protection film with self-repairing, hydrophobic, anti-graffiti and wear-resistant properties 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.

6. The automotive paint protection film with self-repairing, hydrophobic, anti-graffiti and wear-resistant properties 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.

7. The automotive paint protection film with self-repairing, hydrophobic, anti-graffiti and wear-resistant properties according to claim 1, characterized in that: The invention also includes a protective film layer which is compounded onto the surface of the UV light-curing fluorosilicone resin modified easy-to-clean coating.

8. The automotive paint protection film having self-repairing, hydrophobic, anti-graffiti and wear-resistant properties according to claim 7, characterized in that: The protective film layer is a PET protective film with a thickness of 12 μm-75 μm.

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