Anti-aging and anti-yellowing PET protective film and preparation method thereof

Abstract

The invention relates to an anti-aging and anti-yellowing PET (Polyethylene Terephthalate) protective film and a preparation method thereof, and belongs to the technical field of high polymer materials. The anti-aging and anti-yellowing PET protective film comprises the following components in parts by weight: 50-90 parts of PET resin, 5-15 parts of a modified anti-aging agent, 0.2-1 part of a stabilizer, 3-5 parts of a dispersant and 0.1-1 part of a lubricant, the anti-aging and anti-yellowing PET protective film prepared by the invention not only has a good high-temperature-resistant effect, but also has excellent anti-ultraviolet and chemical corrosion-resistant effects.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high polymer materials, and particularly relates to a PET protective film resistant to aging and yellowing and a preparation method thereof. BACKGROUND

[0002] The PET protective film is prepared by taking PET (polyethylene terephthalate) as a base material and being subjected to special treatment, has excellent properties such as anti-creep property, fatigue property, friction resistance and dimensional stability, has the advantages of low cost, excellent appearance performance and recyclability, and is widely applied to various fields such as packaging, electronic products, engineering plastics and fiber materials.

[0003] However, although PET is a plastic material with high transparency, high mechanical strength and good chemical stability, its high-temperature resistance range may be exceeded in some plastic injection molding, metal heat treatment or glass processing industrial processes, and PET is easily affected by ultraviolet rays and is prone to oxidation reaction, thereby causing yellowing and shortening the service life, which seriously affects the quality of the protective film; therefore, it has important practical significance and application value to develop a PET protective film resistant to aging and yellowing with excellent properties. SUMMARY

[0004] In order to solve the above technical problems, the application provides a PET protective film resistant to aging and yellowing and a preparation method thereof.

[0005] The object of the application can be achieved by the following technical solutions. A PET protective film resistant to aging and yellowing and a preparation method thereof, comprising the following raw materials by weight: PET resin 50-90 parts, modified anti-aging agent 5-15 parts, stabilizer 0.2-1 part, dispersant 3-5 parts, lubricant 0.1-1 part. The stabilizer is carbon black. The dispersant is polyethylene wax. The lubricant is pentaerythritol stearate.

[0006] The modified anti-aging agent is prepared by the following method: Step A1: uniformly disperse nano-silicon dioxide and hydrogen peroxide, condense and reflux at 60-70 DEG C for 3h, after filtration and washing, add 3-aminopropyl triethoxysilane, anhydrous ethanol and deionized water, ultrasonic stirring for 20min, adjust the pH of the system to 4-7, 70 DEG C magnetic stirring for 2h, after the reaction, filtration, washing, vacuum drying, to obtain the compound; Further, the amount ratio of nano-silica, hydrogen peroxide, 3-aminopropyl triethoxysilane, anhydrous ethanol and deionized water is 0.015-0.03 mol: 25 mL: 0.02-0.04 mol: 9-27 mL: 1-3 mL, and the mass fraction of hydrogen peroxide is 30%; First, the silicon hydroxyl of 3-aminopropyl triethoxysilane and the hydroxyl on the surface of nano-silica are reacted to prepare the compound; Step A2: The compound is dispersed in tetrahydrofuran, and allyl isothiocyanate is slowly added under stirring, and the temperature is increased to 45-55 DEG C, and the reaction is stirred for 3-4 h. After the reaction is completed, filtration, washing and drying are performed to prepare the pre-product 1; Further, the amount ratio of the compound, tetrahydrofuran and allyl isothiocyanate is 0.01-0.03 mol: 10-15 mL: 0.01-0.03 mol; Then, the amino group of the compound and the isothiocyanate group of allyl isothiocyanate are reacted to prepare the pre-product 1; Step A3: Seventeen-fluorodecyl trimethoxysilane, 30 mL of ammonia water and 100 mL of ethanol are mixed, stirred at 60 DEG C for 0.5 h, then gamma-methacryloyloxypropyl trimethoxysilane, 50 mL of ammonia water and 150 mL of ethanol are mixed, stirred at 60 DEG C for 1 h to prepare the pre-product 2; Further, the amount ratio of seventeen-fluorodecyl trimethoxysilane and gamma-methacryloyloxypropyl trimethoxysilane is 0.01-0.03 mol: 0.01-0.03 mol; Secondly, the silicon hydroxyl of seventeen-fluorodecyl trimethoxysilane and gamma-methacryloyloxypropyl trimethoxysilane is reacted to prepare the pre-product 2; Step A4: Hydroxybenzophenone, triethylamine and tetrahydrofuran are mixed, and acryloyl chloride is added dropwise in an ice bath, the dropwise adding time is 1-2 h, the ice bath reaction is performed for 5 h, and after the reaction is completed, precipitation is performed in ice water, washing and vacuum drying are performed to prepare the pre-product 3; Further, the amount ratio of hydroxybenzophenone, triethylamine, tetrahydrofuran and acryloyl chloride is 0.01-0.03 mol: 1.7-3.5 mL: 20-30 mL: 0.01-0.03 mol; Then, the hydroxyl of hydroxybenzophenone and the acyl chloride of acryloyl chloride are reacted to generate the pre-product 3; Step A5: The pre-product 1, the pre-product 2, the pre-product 3 and acetonitrile are mixed, stirred for 10 min, then azobisisobutyronitrile is added, and the stirring is continued for 30 min, and the reaction is performed at 70 DEG C for 3 h, and the rotary evaporation is performed, and vacuum drying is performed at 50 DEG C for 12 h to prepare the modified anti-aging agent; Further, the amount ratio of the pre-product 1, the pre-product 2, the pre-product 3, acetonitrile and azobisisobutyronitrile is 0.01-0.03 mol: 0.01-0.03 mol: 0.01-0.03 mol: 10-20 mL: 0.1-0.2 g; Finally, the modified anti-aging agent is prepared by copolymerization of the carbon-carbon double bonds of the pre-product 1, the pre-product 2 and the pre-product 3.

[0007] A preparation method of an anti-aging yellowing PET protective film, specifically comprising the following steps: S1, uniformly mix and stir the PET resin, the modified anti-aging agent, the stabilizer and the lubricant, control the stirring speed to be 380-420 r / min, then add the dispersant for mixing to prepare a mixture; S2, extrude the mixture in a double screw extruder, granulate, blow film, and cool and shape to prepare the anti-aging yellowing PET protective film.

[0008] The beneficial effects of the present application are: The anti-aging yellowing PET protective film has good high-temperature resistance, excellent ultraviolet resistance and chemical corrosion resistance, and further prolongs the service life.

[0009] The modified anti-aging agent prepared by the present application has the advantages of macromolecular polymers, and exhibits performance beyond traditional small-molecule anti-aging agents. The silicon-oxygen bond energy in the modified anti-aging agent is large, and it can remain stable and is not easy to break in a high-temperature environment, ensuring that the material has good molecular structure integrity at high temperatures, avoiding thermal decomposition or thermal degradation. At the same time, the silicon-oxygen bond has high stability to oxygen and is not easy to oxidize, and cooperates with the fluorocarbon bond in heptadecafluorodecyltrimethoxysilane to reduce the material aging caused by high-temperature thermal aging, so that the material maintains good stability in a high-temperature oxidation environment. In addition, the fluorocarbon bond also endows the material with good chemical corrosion resistance, improving the durability and reliability of the material. In addition, thiourea has good ozone aging resistance and thermal oxidation resistance, can capture free radicals and terminate chain reactions, delays the aging of PET resin, and further effectively prolongs the service life of the protective film and reduces the use cost. After surface modification by 3-aminopropyltriethoxysilane, the nano-silicon dioxide can be uniformly dispersed in the PET resin, and its covalent bond crystal structure has excellent ultraviolet resistance, which can effectively inhibit the atomic displacement damage caused by ultraviolet rays and reduce the vacancy and interstitial defects. The benzene ring and methoxy structure of hydroxybenzophenone cooperatively absorb ultraviolet rays, protect the material from ultraviolet damage, and reduce the aging and yellowing of the material caused by ultraviolet rays. At the same time, the nano-silicon dioxide itself has high thermal conductivity and high-temperature resistance, and after modification, the interface thermal resistance with the resin is reduced, forming an efficient heat conduction path, so that the material maintains dimensional stability in a high-temperature or ultraviolet environment, the thermal expansion coefficient is reduced, and the risk of cracking caused by thermal stress is reduced. DETAILED DESCRIPTION

[0010] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0011] Embodiment 1: A preparation method of an anti-aging yellowing PET protective film, specifically comprising the following steps: S1, the raw materials are weighed according to the weight parts, 50 parts of PET resin, 5 parts of modified anti-aging agent (prepared by the present embodiment), 0.2 parts of stabilizer, 3 parts of dispersing agent, 0.1 parts of lubricant; the PET resin, the modified anti-aging agent, the carbon black and the pentaerythritol stearate are uniformly mixed and stirred, the stirring speed is controlled to be 380 r / min, then the polyethylene wax is added and mixed to prepare a mixture; S2, the mixture is placed into a double screw extruder for extrusion, granulation, blow molding into a film, cooling and shaping to prepare the anti-aging yellowing PET protective film; The modified anti-aging agent is prepared by the following method: Step A1: 0.015 mol of nano silicon dioxide and 25 mL of hydrogen peroxide are uniformly dispersed, and the condensation reflux reaction is carried out at 60°C for 3h, then after filtration and washing, 0.02 mol of 3-aminopropyl triethoxysilane, 9 mL of anhydrous ethanol and 1 mL of deionized water are added, ultrasonic stirring is carried out for 20 min, the pH of the system is adjusted to 4, and magnetic stirring is carried out at 70°C for 2h, after the reaction is completed, filtration, washing and vacuum drying are carried out to prepare a compound, and the mass fraction of hydrogen peroxide is 30%; Step A2: 0.01 mol of the compound is dispersed in 10 mL of tetrahydrofuran, and 0.01 mol of allyl isothiocyanate is slowly added under stirring, and the temperature is increased to 45°C, and stirring reaction is carried out for 3h, after the reaction is completed, filtration, washing and drying are carried out to prepare a pre-product 1; Step A3: 0.01 mol of heptadecafluorodecyltrimethoxysilane, 30 mL of ammonia water and 100 mL of ethanol are mixed, stirring is carried out at 60°C for 0.5h, then 0.01 mol of γ-methacryloyloxypropyltrimethoxysilane, 50 mL of ammonia water and 150 mL of ethanol are mixed, stirring is carried out at 60°C for 1h to prepare a pre-product 2; Step A4: 0.01 mol of hydroxybenzophenone, 1.7 mL of triethylamine and 20 mL of tetrahydrofuran are uniformly mixed, then 0.01 mol of acryloyl chloride is added dropwise under ice bath, the dropwise adding time is 1h, ice bath reaction is carried out for 5h, after the reaction is completed, precipitation is carried out in ice water, washing and vacuum drying are carried out to prepare a pre-product 3; Step A5: 0.01 mol of pre-product 1, 0.01 mol of pre-product 2, 0.01 mol of pre-product 3 and 10 mL of acetonitrile were mixed uniformly, stirred for 10 min, then 0.1 g of azobisisobutyronitrile was added, and stirring was continued for 30 min, 70°C reaction for 3 h, rotary evaporation, vacuum drying at 50°C for 12 h, to obtain the modified anti-aging agent.

[0012] Example 2: A method for preparing an anti-aging yellowing PET protective film, specifically comprising the following steps: S1, the raw materials were weighed according to the weight parts, PET resin 63 parts, modified anti-aging agent 8 parts (prepared by this embodiment), stabilizer 0.45 parts, dispersing agent 3.7 parts, lubricant 0.4 parts; the PET resin, modified anti-aging agent, carbon black and pentaerythritol stearate were mixed and stirred uniformly, the stirring speed was controlled at 393 r / min, then polyethylene wax was added and mixed to obtain a mixture; S2, the mixture was placed in a double screw extruder for extrusion, granulation, blow molding into a film, and cooling and shaping to obtain an anti-aging yellowing PET protective film; The modified anti-aging agent is prepared by the following method: Step A1: 0.02 mol of nano-silicon dioxide and 25 mL of hydrogen peroxide were uniformly dispersed, and 63°C condensation reflux reaction was carried out for 3 h, then filtration, washing, followed by the addition of 0.027 mol of 3-aminopropyl triethoxysilane, 15 mL of anhydrous ethanol and 1.7 mL of deionized water, ultrasonic stirring for 20 min, adjusting the pH of the system to 5, 70°C magnetic stirring for 2 h, after the reaction was completed, filtration, washing, vacuum drying, to obtain the compound, the mass fraction of hydrogen peroxide is 30%; Step A2: 0.017 mol of compound was added to 11.7 mL of tetrahydrofuran and dispersed uniformly, and 0.017 mol of allyl isothiocyanate was slowly added under stirring, the temperature was raised to 48°C, and the stirring reaction was carried out for 3.3 h, after the reaction was completed, filtration, washing, drying, to obtain pre-product 1; Step A3: 0.017 mol of heptadecafluorodecyltrimethoxysilane, 30 mL of ammonia water and 100 mL of ethanol were mixed, stirred at 60°C for 0.5 h, then 0.017 mol of γ-methacryloyloxypropyltrimethoxysilane, 50 mL of ammonia water and 150 mL of ethanol were mixed, stirred at 60°C for 1 h, to obtain pre-product 2; Step A4: 0.017 mol of hydroxybenzophenone, 2.3 mL of triethylamine and 23 mL of tetrahydrofuran were mixed uniformly, then 0.017 mol of acryloyl chloride was added dropwise under ice bath, the dropwise time was 1.3 h, the ice bath reaction was carried out for 5 h, after the reaction was completed, precipitation in ice water, washing, vacuum drying, to obtain pre-product 3; Step A5: 0.017 mol of pre-product 1, 0.017 mol of pre-product 2, 0.017 mol of pre-product 3 and 13 mL of acetonitrile were mixed uniformly, stirred for 10 min, then 0.13 g of azobisisobutyronitrile was added, and stirring was continued for 30 min, 70°C reaction for 3 h, rotary evaporation, vacuum drying at 50°C for 12 h, to obtain the modified anti-aging agent.

[0013] Example 3: A method for preparing an anti-aging yellowing PET protective film, specifically comprising the following steps: S1, the raw materials were weighed according to the weight parts, PET resin 76 parts, modified anti-aging agent 11 parts (prepared by this embodiment), stabilizer 0.7 parts, dispersing agent 4.3 parts, lubricant 0.7 parts; the PET resin, modified anti-aging agent, carbon black and pentaerythritol stearate were mixed and stirred uniformly, the stirring speed was controlled at 406 r / min, then polyethylene wax was added and mixed to obtain a mixture; S2, the mixture was placed in a double screw extruder for extrusion, granulation, blow molding into a film, and cooling and shaping to obtain an anti-aging yellowing PET protective film; The modified anti-aging agent is prepared by the following method: Step A1: 0.025 mol of nano-silicon dioxide and 25 mL of hydrogen peroxide were dispersed uniformly, and the system was condensed and refluxed at 66°C for 3 h. After filtration, washing, 0.034 mol of 3-aminopropyl triethoxysilane, 21 mL of anhydrous ethanol and 2.4 mL of deionized water were added, ultrasonic stirring was carried out for 20 min, the pH of the system was adjusted to 6, and magnetic stirring was carried out at 70°C for 2 h. After the reaction was completed, filtration, washing and vacuum drying were carried out to obtain a compound, and the mass fraction of hydrogen peroxide was 30%; Step A2: 0.024 mol of the compound was dispersed in 13.4 mL of tetrahydrofuran, and 0.024 mol of allyl isothiocyanate was slowly added under stirring. The temperature was raised to 51°C, and stirring was carried out for 3.6 h. After the reaction was completed, filtration, washing and drying were carried out to obtain a pre-product 1. Step A3: 0.024 mol of heptadecafluorodecyltrimethoxysilane, 30 mL of ammonia water and 100 mL of ethanol were mixed, stirred at 60°C for 0.5 h, then 0.024 mol of γ-methacryloyloxypropyltrimethoxysilane, 50 mL of ammonia water and 150 mL of ethanol were mixed, stirred at 60°C for 1 h to obtain a pre-product 2. Step A4: 0.024 mol of hydroxybenzophenone, 2.9 mL of triethylamine and 26 mL of tetrahydrofuran were mixed uniformly, then 0.024 mol of acryloyl chloride was added dropwise in an ice bath, the dropwise addition time was 1.6 h, and the ice bath reaction was carried out for 5 h. After the reaction was completed, precipitation was carried out in ice water, washing and vacuum drying were carried out to obtain a pre-product 3. Step A5: 0.024 mol of pre-product 1, 0.024 mol of pre-product 2, 0.024 mol of pre-product 3 and 16 mL of acetonitrile were mixed uniformly, stirred for 10 min, 0.16 g of azobisisobutyronitrile was added, and stirring was continued for 30 min, 70°C reaction for 3 h, rotary evaporation, vacuum drying at 50°C for 12 h, to obtain the modified anti-aging agent.

[0014] Example 4: A method for preparing an anti-aging yellowing PET protective film, specifically comprising the following steps: S1, the raw materials were weighed according to the weight parts, PET resin 90 parts, modified anti-aging agent 15 parts (prepared by this embodiment), stabilizer 1 part, dispersing agent 5 parts, lubricant 1 part; the PET resin, modified anti-aging agent, carbon black and pentaerythritol stearate were mixed and stirred uniformly, the stirring speed was controlled at 420 r / min, then polyethylene wax was added and mixed to obtain the mixture; S2, the mixture was placed in a double screw extruder for extrusion, granulation, blow molding into a film, and cooling and shaping to obtain an anti-aging yellowing PET protective film; The modified anti-aging agent is prepared by the following method: Step A1: 0.03 mol of nano silicon dioxide and mL of hydrogen peroxide were dispersed uniformly, 70°C condensation reflux reaction for 3h, after filtration, washing, then 0.04 mol of 3-aminopropyl triethoxysilane, 27 mL of anhydrous ethanol and 3 mL of deionized water were added, ultrasonic stirring for 20 min, the pH of the system was adjusted to 7, 70°C magnetic stirring for 2h, after the reaction was completed, filtration, washing, vacuum drying, to obtain the compound, the mass fraction of hydrogen peroxide is 30%; Step A2: 0.03 mol of compound was added to 15 mL of tetrahydrofuran and dispersed uniformly, and 0.03 mol of allyl isothiocyanate was slowly added under stirring, the temperature was raised to 55°C, and the stirring reaction was carried out for 4h, after the reaction was completed, filtration, washing, drying, to obtain pre-product 1; Step A3: 0.03 mol of heptadecafluorodecyltrimethoxysilane, 30 mL of ammonia water and 100 mL of ethanol were mixed, stirred at 60°C for 0.5h, then 0.03 mol of γ-methacryloyloxypropyltrimethoxysilane, 50 mL of ammonia water and 150 mL of ethanol were mixed, stirred at 60°C for 1h, to obtain pre-product 2; Step A4: 0.03 mol of hydroxybenzophenone, 3.5 mL of triethylamine and 30 mL of tetrahydrofuran were mixed uniformly, then 0.03 mol of acryloyl chloride was added dropwise in an ice bath, the dropwise time was 2h, the ice bath reaction was carried out for 5h, after the reaction was completed, precipitation in ice water, washing, vacuum drying, to obtain pre-product 3; Step A5: 0.03 mol of pre-product 1, 0.03 mol of pre-product 2, 0.03 mol of pre-product 3 and 20 mL of acetonitrile were mixed uniformly, stirred for 10 min, 0.2 g of azobisisobutyronitrile was added, and stirring was continued for 30 min, and the reaction was carried out at 70°C for 3 h, rotary evaporation, vacuum drying at 50°C for 12 h, to obtain the modified anti-aging agent.

[0015] The comparative example is an anti-aging yellowing PET protective film, which is different from example 3 in that an equal amount of antioxidant 1010 is used instead of the modified anti-aging agent prepared in example 3, and the rest is the same.

[0016] Performance test: the anti-aging yellowing PET protective film prepared in examples 1-4 and the comparative example was cut into a standard test size, and placed on a rotating sample holder 20 cm (500 W / m 2 , 340 nm) away from the light source in a UV aging test box under the irradiation of 340 nm ultraviolet light, and irradiated for 72 h. The color difference before and after the test was tested, the larger the color difference, the worse the anti-ultraviolet effect; the tensile strength was tested at room temperature and 90°C according to standard ISO 527, and the chemical corrosion resistance time test was carried out; the test results are shown in Table 1: Table 1

[0017] As can be seen from the data in Table 1, the anti-aging yellowing PET protective film prepared in the application has good high temperature resistance and anti-ultraviolet effect. As can be seen from Table 1, the anti-aging yellowing PET protective film prepared in the application has good chemical corrosion resistance, which prolongs the service life.

[0018] The above content is only an example and description of the concept of the application, and those skilled in the art can make various modifications or supplements or use similar ways to replace the described specific embodiments, as long as they do not deviate from the concept of the application or exceed the scope defined by the claims, and they should belong to the protection scope of the application.

Claims

1. A method for preparing an anti-aging yellowing PET protective film, characterized in that, Specifically comprising the following steps: S1, the raw materials are weighed by weight parts, PET resin 50-90 parts, modified anti-aging agent 5-15 parts, stabilizer 0.2-1 part, dispersant 3-5 parts, lubricant 0.1-1 part; the PET resin, modified anti-aging agent, stabilizer and lubricant are mixed and stirred uniformly, the stirring speed is controlled to be 380-420 r / min, then the dispersant is added and mixed, and the mixture is prepared; S2, the mixture is placed into a double screw extruder for extrusion, granulation, blow molding into a film, cooling and shaping, and an anti-aging yellowing PET protective film is prepared; The modified anti-aging agent is prepared by the following method: Step A1: the nano-silicon dioxide and hydrogen peroxide are uniformly dispersed, and the condensation reflux reaction is carried out at 60-70 DEG C for 3h, then the filtration, washing, addition of 3-aminopropyl triethoxysilane, anhydrous ethanol and deionized water, ultrasonic stirring for 20 min, adjustment of the system pH to 4-7, 70 DEG C magnetic stirring for 2h, after the reaction is completed, filtration, washing, vacuum drying, and the compound is prepared; Step A2: the compound is added into tetrahydrofuran and dispersed uniformly, and allyl isothiocyanate is slowly added under stirring, the temperature is raised to 45-55 DEG C, and the stirring reaction is carried out for 3-4h, after the reaction is completed, filtration, washing, drying, and the pre-product 1 is prepared; Step A3: 17-fluorodecyl trimethoxysilane, 30 mL of ammonia water and 100 mL of ethanol are mixed, stirring at 60 DEG C for 0.5h, then gamma-methacryloyloxy propyl trimethoxysilane, 50 mL of ammonia water and 150 mL of ethanol are mixed, stirring at 60 DEG C for 1h, and the pre-product 2 is prepared; Step A4: hydroxybenzophenone, triethylamine and tetrahydrofuran are mixed uniformly, then acryloyl chloride is added dropwise under ice bath, the dropwise time is 1-2h, the ice bath reaction is carried out for 5h, after the reaction is completed, the precipitation is carried out in ice water, washing, vacuum drying, and the pre-product 3 is prepared; Step A5: the pre-product 1, the pre-product 2, the pre-product 3 and acetonitrile are mixed uniformly, stirring for 10 min, then azobisisobutyronitrile is added, continuing to stir for 30 min, 70 DEG C reaction for 3h, rotary evaporation, 50 DEG C vacuum drying for 12h, and the modified anti-aging agent is prepared.

2. The preparation method of the anti-aging yellowing PET protective film according to claim 1, characterized in that, In step A1, the dosage ratio of nano-silicon dioxide, hydrogen peroxide, 3-aminopropyl triethoxysilane, anhydrous ethanol and deionized water is 0.015-0.03 mol: 25 mL: 0.02-0.04 mol: 9-27 mL: 1-3 mL, and the mass fraction of hydrogen peroxide is 30%.

3. The method for preparing an aging-resistant and yellowing-resistant PET protective film according to claim 1, characterized in that, In step A2, the dosage ratio of the compound, tetrahydrofuran and allyl isothiocyanate is 0.01-0.03 mol: 10-15 mL: 0.01-0.03 mol.

4. The method for preparing an aging-resistant and yellowing-resistant PET protective film according to claim 1, characterized in that, In step A3, the dosage ratio of 17-fluorodecyl trimethoxysilane and gamma-methacryloyloxy propyl trimethoxysilane is 0.01-0.03 mol: 0.01-0.03 mol.

5. The method for preparing an aging-resistant and yellowing-resistant PET protective film according to claim 1, characterized in that, In step A4, the dosage ratio of hydroxybenzophenone, triethylamine, tetrahydrofuran and acryloyl chloride is 0.01-0.03 mol: 1.7-3.5 mL: 20-30 mL: 0.01-0.03 mol.

6. The method for preparing an aging-resistant and yellowing-resistant PET protective film according to claim 1, characterized in that, The amount ratio of pre-product 1, pre-product 2, pre-product 3, acetonitrile, azobisisobutyronitrile in step A5 is 0.01-0.03 mol: 0.01-0.03 mol: 0.01-0.03 mol: 10-20 mL: 0.1-0.2 g.

7. The method for preparing an aging-resistant and yellowing-resistant PET protective film according to claim 1, characterized in that, The stabilizer is carbon black, the dispersant is polyethylene wax, and the lubricant is pentaerythritol stearate.

8. An anti-aging yellowing PET protective film, characterized by, Prepared according to the preparation method of any one of claims 1-7. Prepared according to the preparation method of any one of claims 1-7.

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