Scratch-resistant automobile film and preparation method thereof

Abstract

The invention discloses a scratch-resistant automobile film and a preparation method thereof, and belongs to the technical field of film materials. The automobile film is prepared from the following raw materials: 80 to 90 parts of polyvinyl chloride resin, 20 to 30 parts of thermoplastic polyurethane rubber, 15 to 25 parts of modified fumed silica, 14 to 24 parts of a plasticizer, 0.8 to 1.2 parts of an auxiliary agent, 0.8 to 1.2 parts of a lubricating agent, 0.8 to 1.2 parts of a dispersing agent, 0.8 to 1 part of a flatting agent and 0.1 to 0.2 part of a cross-linking agent. The modified fumed silica has chemical action with the aid and the polyvinyl chloride resin, so that a spatial network structure is formed among the modified fumed silica, the aid and the polyvinyl chloride resin, the mechanical property, toughness and wear resistance of the vehicle film are greatly improved, and the aid and the fumed silica stably exist in the vehicle film. Furthermore, the automobile film disclosed by the invention has excellent and stable scratch resistance, ageing resistance and the like, and can effectively protect an automobile.

Description

Technical Field

[0001] The invention belongs to the technical field of film materials, and in particular relates to a scratch-resistant automobile film and a preparation method thereof. Background Art

[0002] With the development of science and technology, we have more and more requirements for car body maintenance, which needs to be simpler, more practical and more fashionable, so car film came into being. While car film brings us convenience, it also has some problems. Existing car film is very easy to be scratched or have scratches, which affects the appearance.

[0003] In addition, car film will gradually turn yellow and harden as the use time increases and it is exposed to wind and sun until it becomes unusable, and it has no protective effect on the car. In the prior art, car film is mainly prepared by simply physically mixing an anti-aging agent with a base resin to make the car film less prone to aging. Although this measure has a certain effect, the anti-aging agent in the car film is easy to migrate and fall out, so that the anti-aging effect of the car film is gradually weakened or even disappears, and it is no longer able to protect the car. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a scratch-resistant automobile film and a preparation method thereof.

[0005] The purpose of the present invention can be achieved by the following technical solutions: A scratch-resistant automobile film comprises the following raw materials in parts by weight: 80-90 parts of polyvinyl chloride resin, 20-30 parts of thermoplastic polyurethane rubber, 15-25 parts of modified fumed silica, 14-24 parts of plasticizer, 0.8-1.2 parts of auxiliary agent, 0.8-1.2 parts of lubricant, 0.8-1.2 parts of dispersant, 0.8-1.2 parts of leveling agent and 0.1-0.2 parts of cross-linking agent.

[0006] Furthermore, the modified fumed silica is prepared by the following steps: The fumed silica and deionized water were fully stirred in a three-necked flask, and acetic acid was slowly added to adjust the pH to 4, and then a mixed solution of mercaptopropyltrimethoxysilane and anhydrous ethanol was added while stirring. After the addition was completed, the temperature was raised to 65°C and the reaction was kept warm for 1 hour. After the reaction was completed, it was cooled to room temperature and then centrifuged. After centrifugation, the precipitate was ultrasonically dispersed in anhydrous ethanol for 0.5 hours, and finally dried at 80°C for 12 hours to obtain modified fumed silica. The amount ratio of fumed silica, mercaptopropyltrimethoxysilane, anhydrous ethanol and deionized water was 30g:1.8mL:10mL:200mL.

[0007] Mercaptopropyltrimethoxysilane is hydrolyzed and condensed to form Si-O-Si and Si-OH. Si-OH and the abundant hydroxyl groups on the surface of fumed silica are chemically bonded and cross-linked under heating and acidic conditions to prepare modified fumed silica. The chemical bonding greatly reduces the surface energy of the modified fumed silica, thereby greatly improving the compatibility between the modified fumed silica and the organic raw materials in the car film.

[0008] The modified fumed silica particles are much smaller than ordinary silica. After being added to the car film, due to the high fluidity and small size effect, the surface of the car film becomes denser, the friction coefficient becomes smaller, and the wear resistance and scratch resistance are significantly improved. In addition, when the car film is exposed to ultraviolet rays, the mercapto groups on the surface of the modified fumed silica can react with the double bonds in the additives and the unreacted carbon-carbon double bonds in the polyvinyl chloride resin under the action of the benzoin dimethyl ether crosslinking agent to form a spatial network structure through crosslinking of the modified fumed silica with the additives and the polyvinyl chloride resin. This not only allows the modified fumed silica and the additives to exist more stably in the car film and play a role for a long time, giving the car film excellent and stable scratch resistance, thermal oxidation aging resistance and UV aging resistance, but also greatly improves the mechanical strength, toughness and wear resistance of the material.

[0009] Furthermore, the plasticizer is one or more of diisononyl cyclohexane-1,2-dicarboxylate, dioctyl sebacate, di(2-ethylhexyl) phthalate, and dioctyl phthalate.

[0010] Furthermore, the plasticizer is preferably a mixture of diisononyl cyclohexane-1,2-dicarboxylate and dioctyl sebacate in a mass ratio of 3:1.

[0011] Furthermore, the auxiliary agent is prepared by the following steps: S1. Replace the air and moisture in a dry brown three-necked flask with nitrogen, then add resorcinol, anhydrous aluminum chloride and chloroform, stir and dissolve, then heat to 110°C, slowly add cyanuric chloride, and keep warm for 14 hours. After the reaction, slowly pour the mixture into ice water to precipitate a solid, filter it, and recrystallize it from 80% methanol aqueous solution to obtain intermediate 1; the dosage ratio of cyanuric chloride, resorcinol, anhydrous aluminum chloride and chloroform is 18.4g:10.8mL:2.7g:120mL; Under the catalytic action of anhydrous aluminum chloride, the molar ratio of cyanuric chloride to resorcinol is controlled to be 1:1.2-1.3, and then cyanuric chloride and resorcinol undergo Friedel-Crafts acylation reaction. The reaction process is as follows:

[0012] S2. Add 3,5-di-tert-butyl-4-hydroxycinnamic acid, 2-methylene-1,3-propanediol and chloroform to a dry three-necked flask, stir evenly and then slowly add concentrated sulfuric acid, then heat to 110°C and keep warm for 6 hours. After the reaction, add deionized water and shake, then stand for stratification until the pH of the aqueous phase is neutral. Take the organic phase and dry it with anhydrous magnesium sulfate, filter it, and distill the filtrate under reduced pressure to obtain intermediate 2; the amount ratio of 3,5-di-tert-butyl-4-hydroxycinnamic acid, 2-methylene-1,3-propanediol, concentrated sulfuric acid and chloroform is 28.7g:10mL:1.3mL:180mL; Under the catalytic action of concentrated sulfuric acid, the molar ratio of 3,5-di-tert-butyl-4-hydroxycinnamic acid and 2-methylene-1,3-propylene glycol is controlled to be 1:1.1-1.2, then -COOH of 3,5-di-tert-butyl-4-hydroxycinnamic acid and -OH of 2-methylene-1,3-propylene glycol undergo esterification reaction, and the reaction process is as follows:

[0013] S3, under nitrogen protection, add intermediate 1, 20wt% sodium hydroxide solution and dimethyl sulfoxide into a dry three-necked flask, stir and dissolve, then heat to 65°C, slowly add a mixed solution of intermediate 2 and dimethyl sulfoxide, keep warm and react for 4 hours, cool to room temperature after the reaction, add deionized water, shake and stand for stratification, measure the pH of the aqueous phase to be neutral, take the organic phase and dry it with anhydrous magnesium sulfate, filter it, distill the filtrate under reduced pressure, purify it by column chromatography (the eluent is a mixed solvent of cyclohexane and ethyl acetate, and the volume ratio of cyclohexane and ethyl acetate is 1:1), and distill under reduced pressure to obtain intermediate 3; the amount ratio of intermediate 1 to intermediate 2 is 23.2g:33.7g; Under heating and alkaline conditions, the molar ratio of intermediate 1 to intermediate 2 is controlled to be 1:1.05-1.1, then -Cl of intermediate 1 and -OH of intermediate 2 undergo substitution reaction, and the reaction process is as follows:

[0014] S4. Place a dry three-necked flask in an ice-water bath at 0°C, then add intermediate 3, triethylamine, 2,2,6,6-tetramethylpiperidinamine and dimethyl sulfoxide in sequence under nitrogen protection. After the addition is completed, the temperature is controlled at 0°C to react for 8 hours. After the reaction is completed, distill under reduced pressure to obtain an auxiliary agent; the dosage ratio of intermediate 3, 2,2,6,6-tetramethylpiperidinamine, triethylamine and dimethyl sulfoxide is 45.4g:14.7mL:12mL:200mL.

[0015] Triethylamine is used as an acid-binding agent, and the molar ratio of intermediate 3 and 2,2,6,6-tetramethylpiperidinamine is controlled to be 1:1.05-1.1, then -Cl of intermediate 3 and -NH2 of 2,2,6,6-tetramethylpiperidinamine undergo nucleophilic substitution reaction, and the reaction process is as follows:

[0016] The auxiliary agent of the invention contains a hindered phenol structure, a hindered amine structure and a triazine structure, and the three structures work synergistically to endow the vehicle film with excellent resistance to thermal oxygen aging and ultraviolet aging.

[0017] The hindered phenol structure can provide hydrogen atoms to capture free radicals generated by high molecular substances in the car film under heat, light, ultraviolet and other conditions, thereby preventing the oxidative degradation of the car film; the hindered amine structure can reduce the free radicals generated by polymers and organic compounds under the action of light and oxygen, thereby delaying the aging process; the triazine structure absorbs ultraviolet rays through the chelate ring formed by intramolecular hydrogen bonds. When ultraviolet rays irradiate the triazine structure, the hydrogen bonds within the molecule will be destroyed to form unstable high-energy ionic compounds. Subsequently, these high-energy compounds will release excess energy and return to their original low-energy stable state, thereby converting the energy of ultraviolet light into harmless heat release. The triazine structure can protect the car film from damage by ultraviolet rays.

[0018] The auxiliary agent also contains multiple carbon-carbon double bonds, which can react chemically with the unreacted carbon-carbon double bonds at the end of the polyvinyl chloride resin under the action of benzoyl peroxide or triallyl isocyanurate and be grafted onto the polyvinyl chloride macromolecular chain. It is not easy to migrate and fall out, and can stably play an anti-aging role. In addition, there is also a chemical reaction between the auxiliary agent and the modified fumed silica. Therefore, the auxiliary agent of the present invention can be more firmly present in the car film, play an anti-aging role for a long time, make the car film not easy to age, and play a role in protecting the car.

[0019] Furthermore, the lubricant is one or more of butyl stearate, magnesium stearate, zinc stearate, and ethylene bisstearamide.

[0020] Furthermore, the dispersant is one or more of polyacrylamide, pentaerythritol stearate, erucamide, and polyethylene wax.

[0021] Furthermore, the leveling agent is polydimethylsiloxane.

[0022] Furthermore, the cross-linking agent is a mixture of benzoin dimethyl ether, benzoyl peroxide, and triallyl isocyanurate in a mass ratio of 1:0.5:(0-0.5).

[0023] A method for preparing a scratch-resistant automobile film comprises the following steps: The raw materials are weighed in parts by weight and mixed evenly, and then added into a twin-screw extruder for melt blending and extrusion, and then biaxially stretched to obtain a scratch-resistant automobile film.

[0024] The beneficial effects of the present invention are as follows: there is a chemical reaction between the auxiliary agent containing a hindered phenol structure, a hindered amine structure and a triazine structure and the polyvinyl chloride resin, and there is a chemical reaction between the modified fumed silica and the auxiliary agent and the polyvinyl chloride resin, so that a spatial network structure is formed between the auxiliary agent, the modified fumed silica and the polyvinyl chloride resin, which not only greatly improves the mechanical properties, toughness and wear resistance of the vehicle film, but also makes the auxiliary agent and the fumed silica stably present in the vehicle film, not easy to migrate and fall out, and maximizes their own role, and thus the vehicle film of the present invention has excellent and stable scratch resistance and aging resistance and other properties, and can effectively protect the car. DETAILED DESCRIPTION

[0025] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments 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 without creative work are within the scope of protection of the present invention. Example

[0026] The specific steps for preparing modified fumed silica are as follows: 30 g of fumed silica and 200 mL of deionized water were fully stirred in a 500 mL three-necked flask, and acetic acid was slowly added to adjust the pH to 4. Subsequently, a mixed solution of 1.8 mL of mercaptopropyltrimethoxysilane and 10 mL of anhydrous ethanol was added while stirring. After the addition was completed, the temperature was raised to 65°C and the reaction was kept warm for 1 hour. After the reaction was completed, the mixture was cooled to room temperature and then centrifuged. After centrifugation, the precipitate was ultrasonically dispersed in anhydrous ethanol for 0.5 hour, and finally dried at 80°C for 12 hours to obtain modified fumed silica. Example

[0027] The specific steps for preparing modified fumed silica are as follows: The remaining steps remained unchanged, except that the mercaptopropyltrimethoxysilane in Example 1 was replaced by 3-aminopropyltrimethoxysilane to prepare modified fumed silica. Example

[0028] Preparation of auxiliary agent, the specific steps are as follows: S1. Replace the air and moisture in a 250 mL dry brown three-necked flask with nitrogen, add 10.8 mL of resorcinol, 2.7 g of anhydrous aluminum chloride and 120 mL of chloroform, stir to dissolve and then heat to 110°C, slowly add 18.4 g of cyanuric chloride, and keep warm for 14 hours. After the reaction is completed, slowly pour the mixture into ice water to precipitate a solid, filter it, and recrystallize it from 80% methanol aqueous solution to obtain intermediate 1; S2, add 28.7g of 3,5-di-tert-butyl-4-hydroxycinnamic acid, 10mL of 2-methylene-1,3-propanediol and 180mL of chloroform into a 500mL dry three-necked flask, stir evenly and then slowly add 1.3mL of concentrated sulfuric acid, then heat to 110°C and keep warm for 6h. After the reaction is completed, add deionized water and shake, then stand and separate until the pH of the aqueous phase is neutral, take the organic phase, dry it with anhydrous magnesium sulfate, filter it, and distill the filtrate under reduced pressure to obtain intermediate 2; S3, under nitrogen protection, add 23.2g of intermediate 1, 18mL of 20wt% sodium hydroxide solution, and 200mL of dimethyl sulfoxide into a 500mL dry three-necked flask, stir to dissolve, heat to 65°C, slowly add 33.7g of a mixed solution of intermediate 2 and dimethyl sulfoxide, and keep warm for 4h. After the reaction is completed, cool to room temperature and then add deionized water. After shaking, stand and separate. After the pH of the aqueous phase is measured to be neutral, take the organic phase and dry it with anhydrous magnesium sulfate, filter it, and distill the filtrate under reduced pressure, purify it by column chromatography (a mixed solvent of cyclohexane and ethyl acetate is selected as the eluent, and the volume ratio of cyclohexane and ethyl acetate is 1:1), and distill it under reduced pressure to obtain intermediate 3; S4. Place a 500mL dry three-necked flask in a 0℃ ice water bath, then add 45.4g of intermediate 3, 12mL of triethylamine, 14.7mL of 2,2,6,6-tetramethylpiperidinamine and 200mL of dimethyl sulfoxide in sequence under nitrogen protection. After the addition is completed, the temperature is controlled at 0℃ for 8h. After the reaction is completed, distill under reduced pressure to obtain an auxiliary agent. Example

[0029] The specific steps for preparing car film are as follows: 80 parts of polyvinyl chloride resin, 20 parts of thermoplastic polyurethane rubber, 15 parts of modified fumed silica prepared in Example 1, 14 parts of di(2-ethylhexyl) phthalate, 0.8 parts of the auxiliary agent prepared in Example 3, 0.8 parts of ethylene bisstearamide, 0.8 parts of pentaerythritol stearate, 0.8 parts of polydimethylsiloxane, 0.067 parts of benzoin dimethyl ether, and 0.033 parts of benzoyl peroxide were weighed by weight and mixed evenly, then added to a twin-screw extruder for melt blending and extrusion, and then biaxially stretched to obtain an automobile film. Example

[0030] The specific steps for preparing car film are as follows: 86 parts of polyvinyl chloride resin, 27 parts of thermoplastic polyurethane rubber, 21 parts of modified fumed silica prepared in Example 1, 20 parts of dioctyl phthalate, 1.1 parts of the auxiliary agent prepared in Example 3, 0.5 parts of butyl stearate, 0.5 parts of magnesium stearate, 0.5 parts of polyacrylamide, 0.5 parts of polyethylene wax, 0.9 parts of polydimethylsiloxane, 0.083 parts of benzoin dimethyl ether, 0.042 parts of benzoyl peroxide, and 0.025 parts of triallyl isocyanurate were weighed by weight and mixed evenly, then added to a twin-screw extruder for melt blending and extrusion, and then biaxially stretched to obtain an automobile film. Example

[0031] The specific steps for preparing car film are as follows: Weigh 90 parts of polyvinyl chloride resin, 30 parts of thermoplastic polyurethane rubber, 25 parts of modified fumed silica prepared in Example 1, 18 parts of diisononyl cyclohexane 1,2-dicarboxylate, 6 parts of dioctyl sebacate, 1.2 parts of the auxiliary agent prepared in Example 3, 0.8 parts of zinc stearate, 0.4 parts of ethylene bisstearamide, 0.6 parts of pentaerythritol stearate, 0.6 parts of erucamide, 1 part of polydimethylsiloxane, 0.1 parts of benzoin dimethyl ether, 0.05 parts of benzoyl peroxide and 0.05 parts of triallyl isocyanurate and mix well, then add to a twin-screw extruder for melt blending and extrusion, and then biaxially stretch to obtain a car film.

[0032] Comparative Example 1 The specific steps for preparing car film are as follows: The remaining steps remain unchanged, and only the modified fumed silica of Example 4 is removed, thereby preparing the automobile film.

[0033] Comparative Example 2 The specific steps for preparing car film are as follows: The remaining steps remain unchanged, and only the auxiliary agent in Example 4 is removed, thereby preparing the automobile film.

[0034] Comparative Example 3 The specific steps for preparing car film are as follows: The remaining steps remain unchanged, only the modified fumed silica in Example 4 is replaced by the modified fumed silica prepared in Example 2, thereby preparing an automobile film.

[0035] Comparative Example 4 The specific steps for preparing car film are as follows: The remaining steps remain unchanged, only the auxiliary agent in Example 4 is replaced by 0.27 parts of antioxidant 2246, 0.27 parts of ultraviolet absorber UV-9 and 0.26 parts of light stabilizer 744, thereby preparing a car film.

[0036] Performance Testing The automotive films prepared in Examples 4-6 and Comparative Examples 1-4 were subjected to the following performance tests: Scratch resistance test was conducted according to PV-3952 (10N) and PV-3974 (3N) standards, and the color depth change (ΔL value) and gloss change (ΔG value) of the film surface before and after scratching were recorded; the wear resistance was evaluated by ball-disc wear test using an aluminum ball (φ6), and the test conditions were: load 5N, sliding speed 100m / s, sliding distance 300mm, room temperature, no lubrication, and the wear amount was determined by measuring the wear depth and wear width of the film after the wear test. The test results of all items are shown in Table 1 below:

[0037] The automobile films prepared in Examples 2-4 and Comparative Examples 1-4 were placed in dry heat and UV aging boxes for 120 hours, respectively, and the tensile strength of the automobile films before and after aging was measured. The tensile strength test was carried out in accordance with standard GB / T1040.3-2006 "Determination of tensile properties of plastics".

[0038] Dry heat aging test conditions: dry heat aging at 105°C for 120 hours; UV aging test conditions: UV aging for 120 hours under a 30W UV lamp at room temperature and a vertical irradiation distance of 20 cm.

[0039] The test results of all items are shown in Table 2 below:

[0040] In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0041] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A scratch-resistant automobile film, characterized in that: The invention comprises the following raw materials in parts by weight: 80-90 parts of polyvinyl chloride resin, 20-30 parts of thermoplastic polyurethane rubber, 15-25 parts of modified fumed silica, 14-24 parts of plasticizer, 0.8-1.2 parts of auxiliary agent, 0.8-1.2 parts of lubricant, 0.8-1.2 parts of dispersant, 0.8-1.2 parts of leveling agent, and 0.1-0.2 parts of crosslinking agent; Wherein, the modified fumed silica is prepared by the following steps: Stir fumed silica and deionized water in a flask, adjust the pH to 4, add mercaptopropyltrimethoxysilane and anhydrous ethanol, react at 65°C for 1 hour, cool, centrifuge, sonicate, and dry to obtain modified fumed silica; The auxiliary agent is prepared by the following steps: S1. Replace the air and moisture in the bottle with nitrogen, add resorcinol, anhydrous aluminum chloride and chloroform, stir and heat to 110°C, add cyanuric chloride, react for 14 hours, pour into ice water, precipitate solid, filter, and recrystallize to obtain intermediate 1; S2, add 3,5-di-tert-butyl-4-hydroxycinnamic acid, 2-methylene-1,3-propanediol and chloroform into a flask, stir and add concentrated sulfuric acid, react at 110°C for 6 hours, add deionized water, separate the layers, measure the pH of the aqueous phase, take the organic phase, dry it, filter it, and distill it under reduced pressure to obtain intermediate 2; S3, under nitrogen protection, add intermediate 1, sodium hydroxide solution and dimethyl sulfoxide into a flask, stir and heat to 65°C, then add intermediate 2 and dimethyl sulfoxide, react for 4 hours, cool, add deionized water, separate, measure the pH of the aqueous phase, take the organic phase, dry, filter, distill the filtrate under reduced pressure, purify by column chromatography, and distill under reduced pressure to obtain intermediate 3; S4. Place the flask in an ice-water bath at 0°C, add intermediate 3, triethylamine, 2,2,6,6-tetramethylpiperidinamine and dimethyl sulfoxide, react at 0°C for 8 hours, and distill under reduced pressure to obtain an auxiliary agent.

2. The scratch-resistant automobile film according to claim 1, characterized in that: The usage ratio of the fumed silica, mercaptopropyltrimethoxysilane, anhydrous ethanol and deionized water is 30g:1.8mL:10mL:200mL.

3. The scratch-resistant automobile film according to claim 1, characterized in that: The amount ratio of cyanuric chloride, resorcinol, anhydrous aluminum chloride and chloroform in step S1 is 18.4g:10.8mL:2.7g:120mL; the amount ratio of 3,5-di-tert-butyl-4-hydroxycinnamic acid, 2-methylene-1,3-propanediol, concentrated sulfuric acid and chloroform in step S2 is 28.7g:10mL:1.3mL:180mL; the amount ratio of intermediate 1 and intermediate 2 in step S3 is 23.2g:33.7g; the amount ratio of intermediate 3, 2,2,6,6-tetramethylpiperidinamine, triethylamine and dimethyl sulfoxide in step S4 is 45.4g:14.7mL:12mL:200mL.

4. The scratch-resistant automobile film according to claim 1, characterized in that: The plasticizer is one or more of diisononyl cyclohexane 1,2-dicarboxylate, dioctyl sebacate, di(2-ethylhexyl) phthalate and dioctyl phthalate.

5. The scratch-resistant automobile film according to claim 4, characterized in that: The plasticizer is a mixture of diisononyl cyclohexane 1,2-dicarboxylate and dioctyl sebacate in a mass ratio of 3:

1.

6. The scratch-resistant automobile film according to claim 1, characterized in that: The lubricant is one or more of butyl stearate, magnesium stearate, zinc stearate, and ethylene bisstearamide.

7. The scratch-resistant automobile film according to claim 1, characterized in that: The dispersant is one or more of polyacrylamide, pentaerythritol stearate, erucic acid amide and polyethylene wax; and the leveling agent is polydimethylsiloxane.

8. The scratch-resistant automobile film according to claim 1, characterized in that: The cross-linking agent is a mixture of benzoin dimethyl ether, benzoyl peroxide and triallyl isocyanurate in a mass ratio of 1:0.5:(0-0.5).

9. The method for preparing a scratch-resistant automobile film according to claim 1, characterized in that: The following steps are involved: The raw materials are weighed in parts by weight and mixed evenly, and then added into a twin-screw extruder for melt blending and extrusion, and then biaxially stretched to obtain a scratch-resistant automobile film.

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