High performance automotive window film and method of making same

Abstract

This invention relates to a high-performance automotive window film, which is an ABC-type three-layer co-extruded film; wherein layer A is the outermost layer, layer B is the middle layer, and layer C is the innermost layer; the materials of layers A and C are each composed of the following raw materials by weight percentage: 60-70% PET resin chips, 20-30% modified PET resin chips, and 10-15% additives; the material of layer B is PET resin chips. The automotive window film of this invention not only possesses excellent optical properties such as high transmittance, low reflectance, and low haze, but also excellent performance properties such as high temperature resistance, heat insulation, wear resistance, antistatic properties, and anti-adhesion, meeting the long-term use requirements of automotive windows under harsh conditions.

Description

Technical Field

[0001] This invention relates to the field of thin film technology, and more particularly to a high-performance automotive window film and its preparation method. Background Technology

[0002] Cars bring immense convenience to people's travel and, after years of development, have become a common household item, with annual car sales exceeding 20 million units nationwide. Automotive window tinting is increasingly accepted by car owners. This tinting offers multiple functions, primarily including heat insulation and explosion-proof properties, helping to block heat, save energy, reduce emissions, and prevent glass shards from causing injury. However, existing automotive window films, due to the long-term use under harsh conditions, are prone to releasing low-molecular-weight substances from the film layer, leading to reduced light transmittance and increased haze, thus affecting the driver's visibility. Furthermore, some existing automotive window films use PET resin as a base material; its excellent insulation properties prevent it from achieving anti-static effects, causing dust and other impurities to easily accumulate on the film surface, thus affecting the film's usability. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the present invention provides a high-performance automotive window film to solve the problem that existing automotive window films cannot simultaneously possess excellent optical properties such as high transmission, low reflection and low haze, as well as excellent performance properties such as high temperature resistance, heat insulation, wear resistance, antistatic and anti-adhesion, so as to meet the long-term use requirements of automotive windows under harsh conditions.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A high-performance automotive window film, wherein the automotive window film is an ABC-type three-layer co-extruded film; wherein layer A is the outermost layer, layer B is the middle layer, and layer C is the innermost layer; the materials of layers A and C are both composed of the following raw materials in the following mass percentages: 60-70% PET resin chips, 20-30% modified PET resin chips, and 10-15% additives; the material of layer B is PET resin chips.

[0006] Preferably, the modification method for the modified PET resin chips is as follows: First, fluorinated terephthalic acid, diol, catalyst, and stabilizer are prepared into a slurry, and esterification is carried out under conditions of 0.1–0.3 MPa and 220–260°C to obtain an esterified product; then, the esterified product is subjected to a polycondensation reaction under conditions of 10–1000 Pa and 240–280°C for 1–4 hours, and after extrusion and slicing by a screw extruder, the modified PET resin chips are obtained. Preferably, the fluorinated terephthalic acid is at least one of 2,5-difluoroterephthalic acid, 2,3,5,6-tetrafluoroterephthalic acid, and 2-fluoroterephthalic acid. This invention uses fluorinated terephthalic acid as a reactive monomer for polyester. While ensuring the good film-forming properties of polyester, it improves the surface properties of the film material by introducing fluorine atoms into the polymer film. Compared with adding fluorinated additives, the fluorinated polymer film of this invention not only improves the long-term performance of its hydrophobic, oleophobic and antifouling properties, but also improves the wear resistance and weather resistance of automotive window films.

[0007] Preferably, the diol is composed of ethylene glycol in a molar ratio of 1 to 10:1 and an ethylene glycol derivative containing pyridine quaternary ammonium salt functional groups. This invention, by introducing an ethylene glycol derivative containing pyridine quaternary ammonium salt functional groups into the reaction, endows the film resin body with multiple conductive active sites, effectively improving the antistatic properties of automotive window films.

[0008] Preferably, the chemical formula of the ethylene glycol derivative containing the pyridine quaternary ammonium salt functional group is shown in structural formula I. ,

[0009] In the formula, R1 and R2 are independently selected from methyl, ethyl, or propyl, and X － BF4 － or PF6 － .

[0010] Preferably, the additive is first obtained by addition polymerization of vinyl-POSS, acrylamide, and acrylic monomers; then the reaction product is mixed with titanium hydroxide and organic acid, and successively subjected to calcination, ball milling, granulation, and sieving. This invention involves the simultaneous calcination of the network-structured organic-inorganic hybrid product resulting from the addition polymerization of vinyl-POSS, acrylamide, and acrylic monomers with titanium hydroxide. This process causes the structure of the organic-inorganic hybrid product to break and collapse, facilitating further ball milling and granulation to obtain a composite microparticle additive. Furthermore, the simultaneous calcination reaction decomposes titanium hydroxide into titanium dioxide, resulting in a silicon-rich composite microparticle additive with in-situ titanium dioxide doping. The composite microparticle additive prepared by this invention not only provides automotive window films with excellent optical properties such as high transmission, low reflection, and low haze, but also excellent performance characteristics such as high temperature resistance, heat insulation, wear resistance, and anti-adhesion, meeting the long-term use requirements of automotive windows under harsh conditions. In this invention, the vinyl-POSS is preferably octavinyl-POSS (also known as octavinyloctasilylsesquioxane, CAS: 69655-76-1).

[0011] Preferably, during the calcination operation, the calcination temperature is 620–680℃, and the calcination time is 0.5–1.5 hours; during the ball milling operation, zirconia balls are used as the milling medium, the ball-to-material ratio is 1–10:1–6, the milling time is 200–300 min, and the ball mill speed is 500–600 r / min; during the granulation operation, the operating temperature of the spray granulator is 100–300℃; and during the sieving operation, the material is sieved through 50–300 mesh and then through 400–2000 mesh mesh.

[0012] Preferably, the acrylic monomer is at least one of methyl acrylate, ethyl acrylate, or n-butyl acrylate.

[0013] Preferably, the molar ratio of vinyl-POSS, acrylamide, and acrylic monomers is 1-2:1:4-8.

[0014] Another aspect of the present invention is to provide a method for preparing the high-performance automotive window film as described above. The method comprises: weighing automotive window film A layer and C layer materials according to the following mass percentage composition: 60-70% PET resin chips, 20-30% modified PET resin chips, and 10-15% additives, and mixing them evenly for later use; using PET resin chips as the B layer material; and passing the automotive window film A layer, C layer materials, and B layer material through extruder A at a temperature of 280-300°C and extruder B at a temperature of 270-290°C, respectively. After melting at ℃, the film is co-extruded through an ABC three-layer structure and then cold-drummed onto a composite casting at 5-15℃. The composite casting is then stretched longitudinally by 2.4-3.2 times at 90-120℃, cooled to 45-60℃ in 1-5 seconds, and then stretched transversely by 2.1-2.8 times at 110-150℃. The biaxially stretched ABC three-layer composite film is then heat-set at 215-235℃ for 8-120 seconds. After cooling, it is wound up to obtain the high-performance automotive window film.

[0015] This invention directly uses functional nanomaterials to composite and modify PET resin chips, and then biaxially stretches them to produce a high-transparency, low-reflectivity PET substrate. This replaces or reduces the subsequent double-sided coating and hardening process of the film, further improving the film's high-temperature resistance, wear resistance, and other performance characteristics.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] This invention provides a high-performance automotive window film that solves the problem that existing automotive window films cannot simultaneously possess excellent optical properties such as high transmission, low reflection, and low haze, as well as excellent performance properties such as high temperature resistance, heat insulation, wear resistance, antistatic properties, and anti-adhesion properties, thus meeting the long-term use requirements of automotive windows under harsh conditions. Detailed Implementation

[0018] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. Example 1

[0019] This embodiment describes a high-performance automotive window film, which is an ABC-type three-layer co-extruded film. Layer A is the outermost layer, layer B is the middle layer, and layer C is the innermost layer. Layers A and C are each composed of the following raw materials by weight percentage: 60% PET resin chips, 30% modified PET resin chips, and 10% additives. Layer B is made of PET resin chips. The thickness of layers A and C is 45 μm, and the thickness of layer B is 60 μm.

[0020] The preparation method of the high-performance automotive window film in this embodiment specifically includes the following steps: First, weigh the automotive window film A layer and C layer materials according to the following mass percentage composition: 60% PET resin chips, 30% modified PET resin chips, and 10% additives, and mix them evenly for later use; use PET resin chips as the B layer material; Second, melt the automotive window film A layer, C layer materials, and B layer materials respectively through extruder A at 280°C and extruder B at 280°C, then co-extrude them through an ABC three-layer structure, and then cold-drum composite casting at 10°C; Next, the composite casting is stretched 2.4 times longitudinally at 90°C, then cooled to 60°C in 1 second, and then stretched 2.1 times transversely at 110°C. The biaxially stretched ABC three-layer composite film is then heat-set at 215°C for 30 seconds; Finally, after cooling, it is wound up to obtain the high-performance automotive window film.

[0021] The modification method for the modified PET resin chips is as follows: First, 2,5-difluoroterephthalic acid, diol, antimony trioxide catalyst, and triphenyl phosphate stabilizer are prepared into a slurry, and esterification is carried out under a pressure of 0.15 MPa and a temperature of 220°C to obtain an esterified product. Then, the esterified product is subjected to a polycondensation reaction under a pressure of 100 Pa and a temperature of 250°C for 2 hours. After extrusion and slicing by a screw extruder, the modified PET resin chips are obtained. The molar ratio of 2,5-difluoroterephthalic acid to diol is 1:1.5, and the mass percentages of antimony trioxide and triphenyl phosphate in the slurry are 1.2% and 0.5%, respectively.

[0022] The diol is composed of ethylene glycol in a molar ratio of 3:1 and an ethylene glycol derivative containing pyridine quaternary ammonium salt functional groups. The chemical formula of the ethylene glycol derivative containing pyridine quaternary ammonium salt functional groups is shown in structural formula I.

[0023] ,

[0024] In the formula, R1 and R2 are both selected from methyl groups, and X... － BF4 － .

[0025] Specifically, the preparation method of the ethylene glycol derivative containing pyridine quaternary ammonium salt functional group is as follows: 4-vinylpyridine and bromomethane are dissolved in tetrahydrofuran solution at a molar ratio of 1:1. After heating under reflux for 12 hours with stirring, the mixture is filtered. The reaction product is dissolved in tetrahydrofuran solution. An excess of sodium tetrafluoroborate is added to carry out an ion exchange reaction to obtain a pyridine derivative. Then, the pyridine derivative at a molar ratio of 1:1.1 is reacted with divinyl ethylene glycol to obtain the ethylene glycol derivative containing pyridine quaternary ammonium salt functional group shown in structural formula I.

[0026] The additive is first obtained by addition polymerization of vinyl-POSS, acrylamide, and methyl acrylate monomers in a molar ratio of 1:1:8. The reaction product is then mixed with titanium hydroxide and propionic acid, and subsequently subjected to calcination, ball milling, granulation, and sieving. The mass ratio of the reaction product to titanium hydroxide and propionic acid is 10:3:1. During calcination, the calcination temperature is 650℃ and the calcination time is 1.5 hours. During ball milling, zirconia balls are used as the milling medium, the ball-to-material ratio is 1:2, the ball milling time is 200 minutes, and the ball mill speed is 600 r / min. During granulation, the operating temperature of the spray granulator is 120℃. During sieving, the material is sieved through a 50-mesh screen and then through a 400-mesh screen. Example 2

[0027] This embodiment describes a high-performance automotive window film, which is an ABC-type three-layer co-extruded film. Layer A is the outermost layer, layer B is the middle layer, and layer C is the innermost layer. Layers A and C are each composed of the following raw materials by weight percentage: 65% PET resin chips, 25% modified PET resin chips, and 10% additives. Layer B is made of PET resin chips. The thickness of layers A and C is 40 μm, and the thickness of layer B is 50 μm.

[0028] The preparation method of the high-performance automotive window film in this embodiment specifically includes the following steps: First, weigh the automotive window film A layer and C layer materials according to the following mass percentage composition: 65% PET resin chips, 25% modified PET resin chips and 10% additives, mix them evenly and set aside; and use PET resin chips as the B layer material; Second, melt the automotive window film A layer, C layer materials and B layer materials respectively through extruder A at a temperature of 300°C and extruder B at a temperature of 290°C, and then co-extrude them through an ABC three-layer structure, and then cold-drum composite casting at a temperature of 15°C; Next, the composite casting is stretched 2.8 times longitudinally at a temperature of 120°C, then cooled to a temperature of 60°C for 3 seconds, and then stretched 2.5 times transversely at a temperature of 120°C. The biaxially stretched ABC three-layer composite film is then heat-set at a temperature of 225°C for 90 seconds; Finally, after cooling, it is wound up to obtain the high-performance automotive window film.

[0029] The modification method for the modified PET resin chips is as follows: First, 2,3,5,6-tetrafluoroterephthalic acid, diol, antimony trioxide catalyst, and triphenyl phosphate stabilizer are prepared into a slurry, and esterification is carried out under a pressure of 0.2 MPa and a temperature of 240°C to obtain an esterified product. Then, the esterified product is subjected to a polycondensation reaction under a pressure of 100 Pa and a temperature of 260°C for 3 hours. After extrusion and slicing by a screw extruder, the modified PET resin chips are obtained. The molar ratio of the fluorinated terephthalic acid to the diol is 1:1.5, and the mass percentages of antimony trioxide and triphenyl phosphate in the slurry are 1.2% and 0.5%, respectively.

[0030] The diol is composed of ethylene glycol in a molar ratio of 5:1 and an ethylene glycol derivative containing a pyridine quaternary ammonium salt functional group. The chemical formula of the ethylene glycol derivative containing the pyridine quaternary ammonium salt functional group is shown in structural formula I.

[0031] ,

[0032] In the formula, R1 and R2 are both selected from ethyl groups, and X... － BF4 － .

[0033] Specifically, the preparation method of the ethylene glycol derivative containing pyridine quaternary ammonium salt functional group is as follows: 4-vinylpyridine and bromoethane are dissolved in tetrahydrofuran solution at a molar ratio of 1:1. After heating under reflux for 12 hours with stirring, the mixture is filtered. The reaction product is dissolved in tetrahydrofuran solution. An excess of sodium tetrafluoroborate is added to carry out an ion exchange reaction to obtain a pyridine derivative. Then, the pyridine derivative at a molar ratio of 1:1.1 is reacted with divinyl ethylene glycol to obtain the ethylene glycol derivative containing pyridine quaternary ammonium salt functional group shown in structural formula I.

[0034] The additive is first obtained by addition polymerization of vinyl-POSS, acrylamide, and ethyl acrylate monomers in a molar ratio of 2:1:4. The reaction product is then mixed with titanium hydroxide and citric acid, and subsequently subjected to calcination, ball milling, granulation, and sieving. The mass ratio of the reaction product to titanium hydroxide and citric acid is 10:3:1. During calcination, the temperature is 620℃ and the calcination time is 1 hour. During ball milling, zirconia balls are used as the milling medium, the ball-to-material ratio is 5:2, the milling time is 250 minutes, and the ball mill speed is 550 r / min. During granulation, the spray granulator operates at 200℃. During sieving, the material is sieved through a 100-mesh screen and then through a 500-mesh screen. Example 3

[0035] This embodiment describes a high-performance automotive window film, which is an ABC-type three-layer co-extruded film. Layer A is the outermost layer, layer B is the middle layer, and layer C is the innermost layer. Layers A and C are each composed of the following raw materials by weight percentage: 60% PET resin chips, 25% modified PET resin chips, and 15% additives. Layer B is made of PET resin chips. The thickness of layers A and C is 50 μm, and the thickness of layer B is 60 μm.

[0036] The preparation method of the high-performance automotive window film in this embodiment specifically includes the following steps: First, weigh the automotive window film A layer and C layer materials according to the following mass percentage composition: 60% PET resin chips, 25% modified PET resin chips and 15% additives, mix them evenly and set aside; and use PET resin chips as the B layer material; Second, melt the automotive window film A layer, C layer materials and B layer materials respectively through extruder A at a temperature of 300°C and extruder B at a temperature of 290°C, and then co-extrude them through an ABC three-layer structure, and then cold-drum composite casting at a temperature of 5°C; Next, the composite casting is stretched 3.2 times longitudinally at a temperature of 120°C, then cooled to a temperature of 60°C for 5 seconds, and then stretched 2.8 times transversely at a temperature of 150°C. The biaxially stretched ABC three-layer composite film is then heat-set at a temperature of 235°C for 120 seconds; Finally, after cooling, it is wound up to obtain the high-performance automotive window film.

[0037] The modification method for the modified PET resin chips is as follows: First, 2-fluoroterephthalic acid, diol, antimony trioxide catalyst, and triphenyl phosphate stabilizer are prepared into a slurry, and esterification reaction is carried out under a pressure of 0.3 MPa and a temperature of 260°C to obtain an esterified product. Then, the esterified product is subjected to a polycondensation reaction under a pressure of 500 Pa and a temperature of 280°C for 4 hours. After extrusion and slicing by a screw extruder, the modified PET resin chips are obtained. The molar ratio of fluorinated terephthalic acid to diol is 1:1.5, and the mass percentages of antimony trioxide and triphenyl phosphate in the slurry are 1.2% and 0.5%, respectively.

[0038] The diol is composed of ethylene glycol in a molar ratio of 10:1 and an ethylene glycol derivative containing a pyridine quaternary ammonium salt functional group. The chemical formula of the ethylene glycol derivative containing the pyridine quaternary ammonium salt functional group is shown in structural formula I.

[0039] ,

[0040] In the formula, R1 and R2 are both selected from propyl, X － BF4 － .

[0041] Specifically, the method for preparing the ethylene glycol derivative containing pyridine quaternary ammonium salt functional group is as follows: 4-vinylpyridine and bromopropane are dissolved in tetrahydrofuran solution at a molar ratio of 1:1, heated under reflux for 12 hours with stirring, and then filtered to obtain the pyridine derivative; then the pyridine derivative at a molar ratio of 1:1.1 is reacted with divinylethylene glycol to obtain the ethylene glycol derivative containing pyridine quaternary ammonium salt functional group shown in structural formula I.

[0042] The additive is first obtained by addition polymerization of vinyl-POSS, acrylamide, and n-butyl acrylate monomers in a molar ratio of 1.5:1:6. The reaction product is then mixed with titanium hydroxide and malic acid, and subsequently subjected to calcination, ball milling, granulation, and sieving. The mass ratio of the reaction product to titanium hydroxide and malic acid is 10:3:1. During calcination, the calcination temperature is 680℃ and the calcination time is 1.5 hours. During ball milling, zirconia balls are used as the milling medium, the ball-to-material ratio is 10:3, the ball milling time is 300 minutes, and the ball mill speed is 600 r / min. During granulation, the operating temperature of the spray granulator is 150℃. During sieving, the material is sieved through 100 mesh and then 800 mesh. Example 4

[0043] The preparation method of the high-performance automotive window film in this embodiment is basically the same as that in Example 1 in terms of film structure, raw materials, and preparation steps. The difference is that in this embodiment, the automotive window film is an ABC-type three-layer co-extruded film; wherein layer A is the outer layer, layer B is the middle layer, and layer C is the inner layer; the materials of layers A and C are both composed of the following raw materials in the following mass percentages: 70% PET resin chips, 20% modified PET resin chips, and 10% additives; the material of layer B is PET resin chips. In the modification method of the modified PET resin chips, 2,3,5,6-tetrafluoroterephthalic acid is used instead of 2,5-difluoroterephthalic acid; the diol is composed of ethylene glycol in a molar ratio of 5:1 and an ethylene glycol derivative containing pyridine quaternary ammonium salt functional groups. The chemical formula of the ethylene glycol derivative containing pyridine quaternary ammonium salt functional groups is shown in structural formula I.

[0044] ,

[0045] In the formula, R1 and R2 are both selected from ethyl groups, and X... － BF4 － . Example 5

[0046] The preparation method of the high-performance automotive window film in this embodiment is basically the same as that in Example 1 in terms of film structure, raw materials, and preparation steps. The difference is that in this embodiment, the automotive window film is an ABC-type three-layer co-extruded film; wherein, layer A is the outer layer, layer B is the middle layer, and layer C is the inner layer; the materials of layers A and C are both composed of the following raw materials in the following mass percentages: 65% PET resin chips, 25% modified PET resin chips, and 10% additives; the material of layer B is PET resin chips. The thickness of layers A and C is 50 μm, and the thickness of layer B is 50 μm. In the modification method of the modified PET resin chips, 2-fluoroterephthalic acid is used instead of 2,5-difluoroterephthalic acid; the diol is composed of ethylene glycol in a molar ratio of 7:1 and an ethylene glycol derivative containing pyridine quaternary ammonium salt functional groups. The chemical formula of the ethylene glycol derivative containing pyridine quaternary ammonium salt functional groups is shown in structural formula I. ,

[0047] In the formula, R1 and R2 are both selected from propyl, X － For PF6 － .

[0048] Example 6

[0049] The preparation method of the high-performance automotive window film in this embodiment is basically the same as that in Example 1 in terms of film structure, raw materials, and preparation steps. The difference is that in this embodiment, the automotive window film is an ABC-type three-layer co-extruded film; wherein layer A is the outer layer, layer B is the middle layer, and layer C is the inner layer; the materials of layers A and C are both composed of the following raw materials in the following mass percentages: 65% PET resin chips, 25% modified PET resin chips, and 10% additives; the material of layer B is PET resin chips. The thickness of layers A and C is 55 μm, and the thickness of layer B is 65 μm. In the preparation method of the additives, n-butyl acrylate is used instead of methyl acrylate, and citric acid is used instead of propionic acid.

[0050] The automotive window films prepared in Examples 1-6 were subjected to performance tests, and the performance results are shown in Table 1.

[0051] Table 1

[0052]

[0053] Therefore, it is evident that this invention patent has significant advantages over currently used technologies. The basic principles, main features, and advantages of this invention have been shown and described above. Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A high performance automotive window film, characterized by, The automotive window film is an ABC-type three-layer co-extruded film; wherein layer A is the outermost layer, layer B is the middle layer, and layer C is the innermost layer; the materials of layers A and C are both composed of the following raw materials by mass percentage: 60-70% PET resin chips, 20-30% modified PET resin chips, and 10-15% additives; the material of layer B is PET resin chips; the modification method of the modified PET resin chips is as follows: firstly, fluorinated terephthalic acid, diol, catalyst, and stabilizer are prepared. The slurry is subjected to esterification under a pressure of 0.1–0.3 MPa and a temperature of 220–260 °C to obtain an esterified product. Then, the esterified product is subjected to polycondensation under a pressure of 10–1000 Pa and a temperature of 240–280 °C for 1–4 hours. After extrusion and slicing by a screw extruder, the modified PET resin chips are obtained. The diol is composed of ethylene glycol in a molar ratio of 1–10:1 and an ethylene glycol derivative containing pyridine quaternary ammonium salt functional groups.

2. The high performance automotive window film of claim 1, wherein, The fluorinated terephthalic acid is at least one of 2,5-difluoroterephthalic acid, 2,3,5,6-tetrafluoroterephthalic acid, and 2-fluoroterephthalic acid.

3. The high performance automotive window film of claim 1, wherein, The chemical formula of the ethylene glycol derivative containing the pyridine quaternary ammonium salt functional group is shown in structural formula I. ， wherein R1and R2are independently selected from methyl, ethyl or propyl, X － is BF4 － or PF6 － .

4. The high performance automotive window film of claim 1, wherein, The additive is first obtained by addition polymerization of vinyl-POSS, acrylamide and acrylic monomers; then the reaction product is mixed with titanium hydroxide and organic acid, and then subjected to calcination, ball milling, granulation and sieving operations in sequence.

5. The high-performance automotive window film as described in claim 4, characterized in that, During the calcination operation, the calcination temperature is 620–680℃, and the calcination time is 0.5–1.5 hours. During the ball milling operation, zirconia balls are used as the milling medium, the ball-to-material ratio is 1–10:1–6, the milling time is 200–300 min, and the ball mill speed is 500–600 r / min. During the granulation operation, the operating temperature of the spray granulator is 100–300℃. During the sieving operation, the granulators are sieved through 50–300 mesh and 400–2000 mesh mesh successively.

6. The high-performance automotive window film as described in claim 4, characterized in that, The acrylic monomer is at least one of methyl acrylate, ethyl acrylate, or n-butyl acrylate.

7. The high-performance automotive window film as described in claim 4, characterized in that, The molar ratio of vinyl-POSS, acrylamide, and acrylic monomers is 1–2:1:4–8.

8. A method for preparing a high-performance automotive window film as described in any one of claims 1-7, characterized in that, The preparation method is as follows: The following raw material composition by mass percentage is used: 60-70% PET resin chips, 20-30% modified PET resin chips, and 10-15% additives. The A and C layers of the automotive window film are weighed and mixed evenly for later use. PET resin chips are used as the B layer material. The A and C layers of the automotive window film, as well as the B layer material, are melted separately in extruder A at 280-300°C and extruder B at 270-290°C, and then co-extruded using an ABC three-layer structure. After extrusion, a composite casting is cold-drummed at a temperature of 5–15°C. The composite casting is then stretched longitudinally by 2.4–3.2 times at a temperature of 90–120°C, cooled to 45–60°C in 1–5 seconds, and then stretched transversely by 2.1–2.8 times at a temperature of 110–150°C. The biaxially stretched ABC three-layer composite film is then heat-set at a temperature of 215–235°C for 8–120 seconds. After cooling, it is wound up to obtain the high-performance automotive window film.

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