PVC automobile film and preparation method thereof

Abstract

The application relates to the field of PVC products, and discloses a PVC automobile film and a preparation method thereof, wherein the PVC automobile film comprises the following components in parts by weight: 60-70 parts of polyvinyl chloride, 5-12 parts of a filler, 20-22 parts of a plasticizer, 1-2 parts of an ultraviolet absorber, 2-5 parts of a stabilizer and 0.5-1 part of an antioxidant; the filler comprises the following components in parts by weight: 1-2 parts of calcium carbonate, 2-4 parts of zinc oxide and 2-6 parts of titanium dioxide modified by diaphosphorus pentoxide. The technical scheme can solve the problem of insufficient aging resistance of the PVC automobile film in the related art.

Description

Technical Field

[0001] This invention relates to the field of PVC product technology, specifically to a PVC automotive film and its preparation method. Background Technology

[0002] Polyvinyl chloride (PVC) automotive films are widely used in automotive body protection, interior decoration, and heat insulation due to their high cost-effectiveness, flexibility, and ease of molding and application. However, the inherent structural defects of PVC polymers result in poor thermal aging performance, making them unsuitable for the long-term high-temperature outdoor service conditions of automobiles. During vehicle operation and exposure to sunlight, the film is constantly exposed to high temperatures, causing the PVC matrix to undergo thermal degradation reactions, continuously releasing small hydrogen chloride molecules, leading to the breakage of the polymer backbone and the destruction of the molecular cross-linking structure. Existing conventional PVC automotive films do not specifically optimize thermal aging performance, relying only on ordinary additives or fillers for stabilization, resulting in limited heat resistance stability. Under prolonged high temperatures, the film is prone to yellowing, brittleness, cracking, and delamination, while its tensile and toughness properties decrease significantly, severely reducing the protective and decorative effects of the automotive film and shortening its lifespan. Currently, the industry lacks modification solutions that can effectively improve the thermal aging stability of PVC automotive films. Summary of the Invention

[0003] This invention proposes a PVC automotive film and its preparation method, which exhibits excellent aging resistance.

[0004] To achieve this objective, the present invention adopts the following technical solution: In a first aspect, the present invention provides a PVC automotive film comprising the following components in parts by weight: 60-70 parts of polyvinyl chloride, 5-12 parts of filler, 20-22 parts of plasticizer, 1-2 parts of ultraviolet absorber, 2-5 parts of stabilizer, and 0.5-1 parts of antioxidant; wherein the filler comprises the following components in parts by weight: 1-2 parts of calcium carbonate, 2-4 parts of zinc oxide, and 2-6 parts of phosphorus pentoxide-modified titanium dioxide.

[0005] In one embodiment, the PVC automotive film further comprises at least one of pigments, flame retardants, silane coupling agents, and lubricants.

[0006] In one embodiment, the antioxidant includes antioxidant PW-9215 and antioxidant S-9228.

[0007] In one embodiment, the mass ratio of antioxidant PW-9215 to antioxidant S-9228 is 2 to 3:1.

[0008] In one embodiment, the preparation process of the phosphorus pentoxide-modified titanium dioxide includes the following steps: Titanium dioxide is surface activated to obtain activated titanium dioxide; Phosphorus pentoxide is vapor-deposited on the surface of the activated titanium dioxide to obtain phosphorus pentoxide-modified titanium dioxide.

[0009] In one embodiment, the vapor deposition temperature is 380~400℃ and the time is 0.8~1.2h; The carrier gas for the vapor deposition is nitrogen.

[0010] In one embodiment, the mass ratio of phosphorus pentoxide to titanium dioxide is 2~4:10.

[0011] In one embodiment, the plasticizer includes at least one of plasticizer DOTP, plasticizer DBP, plasticizer DOP, and plasticizer DOA; Preferably, the plasticizer is a mixture of plasticizer DBP and plasticizer DOP in a mass ratio of 1:1 to 2.

[0012] In one embodiment, the ultraviolet absorber includes at least one of ultraviolet absorber UV-326, ultraviolet absorber UV-327, ultraviolet absorber UV-350, and ultraviolet absorber UV-234; Preferably, the ultraviolet absorber is ultraviolet absorber UV-327 and ultraviolet absorber UV-234 in a mass ratio of 1:0.5.

[0013] Secondly, the present invention provides a method for preparing the above-mentioned PVC automotive film, comprising the following steps: The components of the PVC automotive film are placed in a high-speed mixer for premixing to obtain a premixed material. The premixed material is fed into an extrusion hopper, plasticized after high-temperature mixing in an extruder, extruded through an extruder die, and sent to a calender roller for calendering. After cooling and shaping, the PVC automotive film is obtained.

[0014] To improve the aging resistance of PVC automotive films, this invention introduces phosphorus pentoxide-modified titanium dioxide into the PVC automotive film system, which has the following beneficial effects: Titanium dioxide itself has basic functions of ultraviolet shielding and thermal stability. After modification with phosphorus pentoxide, on the one hand, it improves the dispersibility of powder in the PVC matrix, avoiding local thermal stress concentration caused by particle agglomeration; on the other hand, it accelerates the capture of free radicals and small hydrogen chloride molecules generated by the thermal degradation of PVC, inhibits polymer chain scission and dehydrochlorination reactions, and delays the thermal aging and embrittlement process of the PVC substrate. Simultaneously, the modified titanium dioxide can synergistically enhance the thermal barrier capacity of the system, reducing heat accumulation inside the film under high-temperature environments. Compared with ordinary titanium dioxide-modified systems, this solution significantly enhances the aging resistance of PVC automotive films. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0016] Due to the poor thermal stability of the PVC matrix, it is prone to thermal degradation under high outdoor temperatures, continuously releasing hydrogen chloride, causing molecular chain breakage, and leading to problems such as yellowing, brittleness, and degradation of mechanical properties in the film. Existing products often use fillers such as ordinary titanium dioxide for modification, but the powder is prone to agglomeration and has poor compatibility with the matrix, limiting its effectiveness in reducing thermal aging. To address this deficiency, this invention employs a scheme of adding phosphorus pentoxide to modify titanium dioxide, which can improve powder dispersibility, inhibit the thermal degradation reaction of PVC, and significantly improve the thermal aging resistance of automotive films; at the same time, it can also improve the abrasion resistance of PVC automotive films.

[0017] Specifically, in order to better understand the technical solution of the present invention, it is described in the following parts.

[0018] Part One This invention provides a PVC automotive film comprising the following components in parts by weight: 60-70 parts of polyvinyl chloride, 5-12 parts of filler, 20-22 parts of plasticizer, 1-2 parts of ultraviolet absorber, 2-5 parts of stabilizer, and 0.5-1 parts of antioxidant; the filler comprises the following components in parts by weight: 1-2 parts of calcium carbonate, 2-4 parts of zinc oxide, and 2-6 parts of phosphorus pentoxide-modified titanium dioxide.

[0019] In this invention, polyvinyl chloride (PVC) is used as the base polymer, possessing excellent mechanical properties, chemical resistance, and processing performance. In practical applications, it provides the necessary strength and stability for automotive films. The addition amount is set at 60-70 parts, and within this range, selectable values ​​include, but are not limited to, 60 parts, 62 parts, 64 parts, 66 parts, 68 parts, and 70 parts. The plasticizer content is 20-22 parts. The plasticizer, by intercalating between PVC molecular chains, weakens the intermolecular forces, lowers the glass transition temperature, and increases the material's flexibility and plasticity, making molding and processing easier and improving production efficiency. Within the range of 20-22 parts, selectable values ​​include, but are not limited to, 20 parts, 20.5 parts, 21 parts, 21.5 parts, and 22 parts. Specific types of plasticizers include, but are not limited to, dioctyl phthalate (DOP), dibutyl phthalate (DBP), dioctyl terephthalate (DOTP), epoxidized soybean oil, trioctyl trimellitate (TOTM), and dioctyl adipate (DOA). Preferably, the plasticizers are DOTP, DBP, DOP, and DOA; more preferably, a mass ratio of DBP and DOP of 1:1-2. The UV absorber content is 1-2 parts, and benzotriazoles can be selected. It absorbs ultraviolet light and converts it into heat energy, avoiding damage to the PVC molecular chain caused by ultraviolet light. Furthermore, it exhibits good compatibility with PVC and uniform dispersion during processing. Within the range of 1-2 parts, selectable values ​​include, but are not limited to, 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, and 2 parts. Specific types of benzotriazole UV absorbers include, but are not limited to, UV-326, UV-327, UV-328, UV-350, and UV-234, preferably at least one of UV-326, UV-327, UV-350, and UV-234, more preferably UV-327 and UV-234 in a mass ratio of 1:0.5. The stabilizer content is 2-5 parts, which can inhibit the thermal degradation and oxidative degradation of PVC during processing and use, and improve the stability of the material; Antioxidants include PW-9215 and S-9228. These two antioxidants are of different types and work synergistically to protect PVC automotive films from oxidation. Compared to other antioxidants and combinations thereof, they further improve the aging resistance of PVC automotive films. Simultaneously, in synergy with phosphorus pentoxide-modified titanium dioxide, multiple layers of protection further inhibit thermal aging. The mass ratio of antioxidant PW-9215 to antioxidant S-9228 is 2~3:1, for example, 2:1, 2.2:1, 2.4:1, 2.6:1, 2.8:1, 3:1, etc.

[0020] The particle sizes of zinc oxide, calcium carbonate, and titanium dioxide (in phosphorus pentoxide-modified titanium dioxide) are each independently 100~500nm, for example, 100nm, 150nm, 200nm, 250nm, 300nm, 350nm, 400nm, 450nm, 500nm, etc.

[0021] In addition to basic components such as polyvinyl chloride, fillers, plasticizers, ultraviolet absorbers, stabilizers, and antioxidants, this invention may also include at least one of pigments, flame retardants, silane coupling agents, and lubricants. These can be selected and added according to the specific functional requirements and applications of the PVC automotive film, and used together with other basic components in appropriate proportions to further expand and optimize the performance of the PVC automotive film and meet diverse market demands.

[0022] In some embodiments of the present invention, the preparation process of phosphorus pentoxide-modified titanium dioxide includes the following steps: Titanium dioxide is surface activated to obtain activated titanium dioxide; Phosphorus pentoxide was vapor-deposited on the surface of activated titanium dioxide to obtain phosphorus pentoxide-modified titanium dioxide.

[0023] In this invention, during the preparation of phosphorus pentoxide-modified titanium dioxide, the vapor deposition temperature is 380~400℃ and the time is 0.8~1.2h; the carrier gas for vapor deposition is nitrogen, which has stable chemical properties and can uniformly transport gaseous phosphorus pentoxide to the reaction area while avoiding unnecessary chemical reactions with phosphorus pentoxide and titanium dioxide; the mass ratio of phosphorus pentoxide to titanium dioxide is 2~4:10, for example, it can be 2:10, 2.5:10, 3:10, 3.5:10, 4:10, etc.

[0024] Part Two This invention provides a method for preparing the above-mentioned PVC automotive film, comprising the following steps: The components of the PVC automotive film are placed in a high-speed mixer for premixing to obtain a premixed material. The premixed material is fed into an extrusion hopper, plasticized after high-temperature mixing in an extruder, extruded through an extruder die, and sent to a calender roller for calendering. After cooling and shaping, the PVC automotive film is obtained.

[0025] method The following methods are used to determine the performance defined in the examples and comparative examples.

[0026] Aging resistance: The aging test chamber temperature was set to 136℃ and the aging time was 168h. The tensile strength of the samples before and after aging was tested and the change rate of tensile strength was calculated. The tensile strength was tested according to GB / T 3830-2024 "Soft Polyvinyl Chloride Calendered Films and Sheets". The test conditions were: tensile speed 200mm / min and sample type 2. Abrasion resistance: A ball-disc abrasion test was conducted using φ6 aluminum balls to measure the wear depth and wear width of the automotive film after the abrasion test to evaluate its abrasion resistance. Test conditions: load 5N, sliding speed 100m / s, sliding distance 300mm.

[0027] Material Unless otherwise specified, all materials used in the embodiments and comparative examples of this invention can be purchased commercially. For example, the polyvinyl chloride is of type S-1300; the silane coupling agent is of type KH550; the titanium dioxide has a particle size of 100 nm; the calcium carbonate has a particle size of 300 nm; and the zinc oxide has a particle size of 300 nm.

[0028] Example 1 The preparation method of PVC automotive film includes the following steps: Preparation of phosphorus pentoxide-modified titanium dioxide (S0): Titanium dioxide was immersed in 2 mol / L HCl for 24 h, filtered, washed until pH 7.0, and vacuum dried to obtain activated titanium dioxide; phosphorus pentoxide was vapor-deposited on the surface of activated titanium dioxide using nitrogen as carrier gas (mass ratio of phosphorus pentoxide to titanium dioxide was 2:10, vapor deposition temperature was 380℃, and time was 1.2 h) to obtain phosphorus pentoxide-modified titanium dioxide. S1. Polyvinyl chloride, filler, ultraviolet absorber, stabilizer, antioxidant and silane coupling agent are placed in a high-speed mixer for premixing to obtain a premix; the premix is ​​fed into the extrusion hopper, plasticized after high-temperature mixing in the extruder, extruded through the extruder die, sent to the calender rollers for calendering and shaping, and then cooled and shaped to obtain PVC automotive film. The performance of the prepared PVC automotive film was tested. The specific components, dosage relationships, and performance test results of the PVC automotive film preparation are shown in Table 1 below. Table 1. Components, dosage relationships, and performance test results

[0029] Example 2 The preparation method of PVC automotive film includes the following steps: Preparation of phosphorus pentoxide-modified titanium dioxide (S0): Titanium dioxide was immersed in 2 mol / L HCl for 24 h, filtered, washed until pH 7.0, and vacuum dried to obtain activated titanium dioxide; phosphorus pentoxide was vapor-deposited on the surface of activated titanium dioxide using nitrogen as carrier gas (mass ratio of phosphorus pentoxide to titanium dioxide was 4:10, vapor deposition temperature was 400℃, and time was 0.8 h) to obtain phosphorus pentoxide-modified titanium dioxide. S1. Polyvinyl chloride, filler, ultraviolet absorber, stabilizer, antioxidant and silane coupling agent are placed in a high-speed mixer for premixing to obtain a premix; the premix is ​​fed into the extrusion hopper, plasticized after high-temperature mixing in the extruder, extruded through the extruder die, sent to the calender rollers for calendering and shaping, and then cooled and shaped to obtain PVC automotive film. The performance of the prepared PVC automotive film was tested. The specific components, dosage relationships, and performance test results of the PVC automotive film preparation are shown in Table 2 below. Table 2. Components, dosage relationships, and performance test results

[0030] Example 3 The preparation method of PVC automotive film includes the following steps: Preparation of phosphorus pentoxide-modified titanium dioxide (S0): Titanium dioxide was immersed in 2 mol / L HCl for 24 h, filtered, washed until pH 7.0, and vacuum dried to obtain activated titanium dioxide; phosphorus pentoxide was vapor-deposited on the surface of activated titanium dioxide using nitrogen as carrier gas (mass ratio of phosphorus pentoxide to titanium dioxide was 4:10, vapor deposition temperature was 400℃, and time was 0.8 h) to obtain phosphorus pentoxide-modified titanium dioxide. S1. Polyvinyl chloride, filler, ultraviolet absorber, stabilizer, antioxidant and silane coupling agent are placed in a high-speed mixer for premixing to obtain a premix; the premix is ​​fed into the extrusion hopper, plasticized after high-temperature mixing in the extruder, extruded through the extruder die, sent to the calender rollers for calendering and shaping, and then cooled and shaped to obtain PVC automotive film. The performance of the prepared PVC automotive film was tested. The specific components, dosage relationships, and performance test results of the PVC automotive film preparation are shown in Table 3 below.

[0031] Table 3. Components, dosage relationships, and performance test results

[0032] Example 4 The preparation method of PVC automotive film includes the following steps: Preparation of phosphorus pentoxide-modified titanium dioxide (S0): Titanium dioxide was immersed in 2 mol / L HCl for 24 h, filtered, washed until pH 7.0, and vacuum dried to obtain activated titanium dioxide; phosphorus pentoxide was vapor-deposited on the surface of activated titanium dioxide using nitrogen as carrier gas (mass ratio of phosphorus pentoxide to titanium dioxide was 4:10, vapor deposition temperature was 400℃, and time was 0.8 h) to obtain phosphorus pentoxide-modified titanium dioxide. S1. Polyvinyl chloride, filler, ultraviolet absorber, stabilizer, antioxidant and silane coupling agent are placed in a high-speed mixer for premixing to obtain a premix; the premix is ​​fed into the extrusion hopper, plasticized after high-temperature mixing in the extruder, extruded through the extruder die, sent to the calender rollers for calendering and shaping, and then cooled and shaped to obtain PVC automotive film. The performance of the prepared PVC automotive film was tested. The specific components, dosage relationships, and performance test results of the PVC automotive film preparation are shown in Table 4 below.

[0033] Table 4. Components, dosage relationships, and performance test results

[0034] Example 5 The preparation method of PVC automotive film includes the following steps: Preparation of phosphorus pentoxide-modified titanium dioxide (S0): Titanium dioxide was immersed in 2 mol / L HCl for 24 h, filtered, washed until pH 7.0, and vacuum dried to obtain activated titanium dioxide; phosphorus pentoxide was vapor-deposited on the surface of activated titanium dioxide using nitrogen as carrier gas (mass ratio of phosphorus pentoxide to titanium dioxide was 4:10, vapor deposition temperature was 400℃, and time was 0.8 h) to obtain phosphorus pentoxide-modified titanium dioxide. S1. Polyvinyl chloride, filler, ultraviolet absorber, stabilizer, antioxidant and silane coupling agent are placed in a high-speed mixer for premixing to obtain a premix; the premix is ​​fed into the extrusion hopper, plasticized after high-temperature mixing in the extruder, extruded through the extruder die, sent to the calender rollers for calendering and shaping, and then cooled and shaped to obtain PVC automotive film. The performance of the prepared PVC automotive film was tested. The specific components, dosage relationships, and performance test results of the PVC automotive film preparation are shown in Table 5 below.

[0035] Table 5. Components, dosage relationships, and performance test results

[0036] Example 6 The preparation method of PVC automotive film includes the following steps: Preparation of phosphorus pentoxide-modified titanium dioxide (S0): Titanium dioxide was immersed in 2 mol / L HCl for 24 h, filtered, washed until pH 7.0, and vacuum dried to obtain activated titanium dioxide; phosphorus pentoxide was vapor-deposited on the surface of activated titanium dioxide using nitrogen as carrier gas (mass ratio of phosphorus pentoxide to titanium dioxide was 4:10, vapor deposition temperature was 400℃, and time was 0.8 h) to obtain phosphorus pentoxide-modified titanium dioxide. S1. Polyvinyl chloride, filler, ultraviolet absorber, stabilizer, antioxidant and silane coupling agent are placed in a high-speed mixer for premixing to obtain a premix; the premix is ​​fed into the extrusion hopper, plasticized after high-temperature mixing in the extruder, extruded through the extruder die, sent to the calender rollers for calendering and shaping, and then cooled and shaped to obtain PVC automotive film. The performance of the prepared PVC automotive film was tested. The specific components, dosage relationships, and performance test results of the PVC automotive film preparation are shown in Table 6 below.

[0037] Table 6. Components, dosage relationships, and performance test results

[0038] Example 7 The preparation method of PVC automotive film includes the following steps: Preparation of phosphorus pentoxide-modified titanium dioxide (S0): Titanium dioxide was immersed in 2 mol / L HCl for 24 h, filtered, washed until pH 7.0, and vacuum dried to obtain activated titanium dioxide; phosphorus pentoxide was vapor-deposited on the surface of activated titanium dioxide using nitrogen as carrier gas (mass ratio of phosphorus pentoxide to titanium dioxide was 4:10, vapor deposition temperature was 400℃, and time was 0.8 h) to obtain phosphorus pentoxide-modified titanium dioxide. S1. Polyvinyl chloride, filler, ultraviolet absorber, stabilizer, antioxidant and silane coupling agent are placed in a high-speed mixer for premixing to obtain a premix; the premix is ​​fed into the extrusion hopper, plasticized after high-temperature mixing in the extruder, extruded through the extruder die, sent to the calender rollers for calendering and shaping, and then cooled and shaped to obtain PVC automotive film. The performance of the prepared PVC automotive film was tested. The specific components, dosage relationships, and performance test results of the PVC automotive film preparation are shown in Table 7 below.

[0039] Table 7. Components, dosage relationships, and performance test results

[0040] Comparative Example 1 The preparation method of PVC automotive film includes the following steps: Polyvinyl chloride, filler, ultraviolet absorber, stabilizer, antioxidant and silane coupling agent are placed in a high-speed mixer for premixing to obtain a premix; the premix is ​​fed into an extrusion hopper, plasticized after high-temperature mixing in an extruder, extruded through the extruder die, sent to the calender rollers for calendering, and then cooled and shaped to obtain PVC automotive film. The performance of the prepared PVC automotive film was tested. The specific components, dosage relationships, and performance test results of the PVC automotive film preparation process are shown in Table 8 below. Table 8. Components, dosage relationships, and performance test results

[0041] Comparative Example 2 The preparation method of PVC automotive film includes the following steps: Polyvinyl chloride, filler, ultraviolet absorber, stabilizer, antioxidant and silane coupling agent are placed in a high-speed mixer for premixing to obtain a premix; the premix is ​​fed into an extrusion hopper, plasticized after high-temperature mixing in an extruder, extruded through the extruder die, sent to the calender rollers for calendering, and then cooled and shaped to obtain PVC automotive film. The performance of the prepared PVC automotive film was tested. The specific components, dosage relationships, and performance test results of the PVC automotive film preparation process are shown in Table 9 below. Table 9. Components, dosage relationships, and performance test results

[0042] Comparative Example 3 The preparation method of PVC automotive film includes the following steps: Polyvinyl chloride, filler, ultraviolet absorber, stabilizer, antioxidant and silane coupling agent are placed in a high-speed mixer for premixing to obtain a premix; the premix is ​​fed into an extrusion hopper, plasticized after high-temperature mixing in an extruder, extruded through the extruder die, sent to the calender rollers for calendering, and then cooled and shaped to obtain PVC automotive film. The performance of the prepared PVC automotive film was tested. The specific components, dosage relationships, and performance test results of the PVC automotive film preparation process are shown in Table 10 below. Table 10 Components, Dosage Relationships, and Performance Test Results

[0043] Compared with the data of Comparative Examples 1-3, the PVC automotive films prepared in Examples 1-7 showed a smaller change rate in tensile strength after aging tests, indicating that the addition of phosphorus pentoxide-modified titanium dioxide to the components of the PVC automotive film improved the aging resistance of the PVC automotive film. At the same time, the wear depth and wear width of Examples 1-2 were smaller than those of Comparative Example 1, indicating that the addition of phosphorus pentoxide-modified titanium dioxide also improved the wear resistance of the PVC automotive film.

[0044] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A PVC automotive film, characterized in that, It comprises the following components in parts by weight: 60-70 parts of polyvinyl chloride, 5-12 parts of filler, 20-22 parts of plasticizer, 1-2 parts of ultraviolet absorber, 2-5 parts of stabilizer, and 0.5-1 parts of antioxidant; wherein the filler comprises the following components in parts by weight: 1-2 parts of calcium carbonate, 2-4 parts of zinc oxide, and 2-6 parts of phosphorus pentoxide-modified titanium dioxide.

2. The PVC automotive film according to claim 1, characterized in that, The components of the PVC automotive film also include at least one of pigments, flame retardants, silane coupling agents, and lubricants.

3. The PVC automotive film according to claim 2, characterized in that, The antioxidants include antioxidant PW-9215 and antioxidant S-9228.

4. The PVC automotive film according to claim 3, characterized in that, The mass ratio of antioxidant PW-9215 to antioxidant S-9228 is 2~3:

1.

5. The PVC automotive film according to claim 1, characterized in that, The preparation process of the phosphorus pentoxide-modified titanium dioxide includes the following steps: Titanium dioxide is surface activated to obtain activated titanium dioxide; Phosphorus pentoxide is vapor-deposited on the surface of the activated titanium dioxide to obtain phosphorus pentoxide-modified titanium dioxide.

6. The PVC automotive film according to claim 5, characterized in that, The vapor deposition temperature is 380~400℃, and the time is 0.8~1.2h; The carrier gas for the vapor deposition is nitrogen.

7. The PVC automotive film according to claim 5, characterized in that, The mass ratio of phosphorus pentoxide to titanium dioxide is 2~4:

10.

8. The PVC automotive film according to claim 1, characterized in that, The plasticizer includes at least one of plasticizer DOTP, plasticizer DBP, plasticizer DOP and plasticizer DOA; Preferably, the plasticizer is a mixture of plasticizer DBP and plasticizer DOP in a mass ratio of 1:1 to 2.

9. The PVC automotive film according to claim 1, characterized in that, The ultraviolet absorber includes at least one of ultraviolet absorber UV-326, ultraviolet absorber UV-327, ultraviolet absorber UV-350 and ultraviolet absorber UV-234; Preferably, the ultraviolet absorber is ultraviolet absorber UV-327 and ultraviolet absorber UV-234 in a mass ratio of 1:0.

5.

10. A method for preparing a PVC automotive film, used to prepare the PVC automotive film according to any one of claims 1 to 9, characterized in that, Includes the following steps: The components of the PVC automotive film are placed in a high-speed mixer for premixing to obtain a premixed material. The premixed material is fed into an extrusion hopper, plasticized after high-temperature mixing in an extruder, extruded through an extruder die, and sent to a calender roller for calendering. After cooling and shaping, the PVC automotive film is obtained.

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