Modified pet material and method for producing the same

Abstract

The application discloses a modified PET material and a preparation method thereof, and belongs to the technical field of PET materials. The method comprises the following steps: uniformly mixing rPET, an antioxidant, a lubricant and modified particles in a high-speed mixer, melt blending by using a double-screw extruder, and extruding and granulating, so that the modified PET material is obtained; the modified particles are a core layer of cerium-doped nano zinc oxide, and a surface is coated with a shell layer structure of a glycidyl methacrylate polymer; the antibacterial performance of the PET is improved while the toughness of the PET is considered, so that the problem of the decrease of the toughness of the material caused by the introduction of inorganic antibacterial agents is avoided.

Description

Technical Field

[0001] This invention belongs to the field of PET material technology, specifically relating to a modified PET material and its preparation method. Background Technology

[0002] With the widespread use of polyester materials, the stock of waste polyethylene terephthalate (PET) is enormous, and its recycling and reuse have both environmental and economic value. In practical use, bacteria, mold, and other microorganisms easily adhere to the surface of ordinary PET / rPET. In humid and warm environments, biofilms can easily form, causing microbial proliferation. This not only produces odors and contaminates contact items but also poses hygiene and safety hazards, making it particularly unsuitable for food contact, packaging, and medical applications where hygiene requirements are high.

[0003] Meanwhile, during the recycling, cleaning, and regranulation process, the molecular chains of recycled rPET break to a certain extent, resulting in lower surface energy. This makes it more conducive to the adhesion and colonization of microorganisms, making it difficult to meet the hygiene requirements of food contact, baby products, and high-end packaging.

[0004] Currently, the industry commonly achieves antibacterial functions by adding inorganic antibacterial agents such as nano-zinc oxide, silver-based, and copper-based agents. However, inorganic particles have poor compatibility with the PET matrix, easily leading to agglomeration and uneven dispersion, resulting in a significant decrease in material toughness, brittleness, and easy breakage. Furthermore, poor processing flowability makes it impossible to balance antibacterial properties and mechanical properties. In addition, directly adding nano-antibacterial particles also presents problems such as high risk of precipitation, poor long-term effectiveness, and weak interfacial bonding with recycled materials, limiting the use of recycled PET in high-end and functional applications. Summary of the Invention

[0005] The purpose of this invention is to provide a modified PET material and its preparation method, which improves the antibacterial properties of PET while maintaining its toughness, and avoids the problem of reduced material toughness caused by the introduction of inorganic antibacterial agents.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A method for preparing a modified PET material includes the following steps:

[0008] rPET is mixed evenly with antioxidants, lubricants, and modified particles in a high-speed mixer, and then melt-blended and extruded using a twin-screw extruder to obtain the modified PET material.

[0009] The modified particles consist of a cerium-doped nano-zinc oxide core layer and a surface coated with a glycidyl methacrylate polymer shell structure.

[0010] As a preferred embodiment of the present invention, the mass ratio of rPET, antioxidant, lubricant and modified particles is 93.19-95.05:0.15-0.21:3-4:1.8-2.6.

[0011] As a preferred embodiment of the present invention, the method for preparing the modified particles includes the following steps:

[0012] S1. Dissolve zinc source, template agent and complexing agent in deionized water, stir magnetically, transfer to polytetrafluoroethylene-lined reactor, hydrothermally react at 120℃ for 2-3 hours, filter, take solid phase and vacuum dry to obtain nano zinc oxide precursor.

[0013] S2. Dissolve urea in deionized water, add the nano zinc oxide precursor, disperse ultrasonically, add cerium source, heat and stir in a water bath, filter, take the solid phase, vacuum dry, and calcine to obtain cerium-doped nano zinc oxide.

[0014] S3. Disperse the cerium-doped nano zinc oxide in an ethanol aqueous solution, add KH570 solution dropwise, adjust the pH of the system to 4-6, reflux and heat at 60℃ for 6-8 hours, filter, wash the solid phase, vacuum dry, cool to room temperature, grind, and sieve to obtain modified cerium-doped nano zinc oxide.

[0015] S4. The modified cerium-doped nano zinc oxide is ultrasonically dispersed in xylene, glycidyl methacrylate and an initiator are added, and ultrasonic stirring is continued. The mixture is heated and stirred in an oil bath at 70°C for 10-12 hours under a nitrogen atmosphere. After centrifugation, the solid phase is washed and vacuum dried to obtain the modified particles.

[0016] As a preferred embodiment of the present invention, in step S1, the mass ratio of the zinc source, template agent, complexing agent and deionized water is 4.9-5.2:1.4-1.6:0.5-0.6:150.

[0017] As a preferred embodiment of the present invention, in step S2, the mass ratio of urea, deionized water, nano zinc oxide precursor, and cerium source is 0.12-0.15:100:1.5-1.8:0.11-0.13.

[0018] As a preferred technical solution of the present invention, in step S2, the calcination refers to calcination at 350-450℃ for 1.5-2.5h.

[0019] As a preferred technical solution of the present invention, in step S3, the ratio of cerium-doped nano zinc oxide, ethanol aqueous solution and KH570 solution is 1.2-1.5g: 100-150mL: 10-20mL.

[0020] As a preferred embodiment of the present invention, in step S4, the ratio of the modified cerium-doped nano zinc oxide, xylene, glycidyl methacrylate and initiator is 1-1.2g: 10-15mL: 2.5-3.2g: 0.12-0.15g.

[0021] A modified PET material prepared using the above-described preparation method.

[0022] The beneficial effects of this invention are:

[0023] This invention involves grafting cerium-doped nano-zinc oxide with KH570 and then coating it with glycidyl methacrylate polymer to form a core-shell structure particle with cerium-doped nano-zinc oxide as the core and glycidyl methacrylate polymer as the shell. This structure can significantly improve the interfacial compatibility and bonding strength between inorganic particles and rPET matrix, making the modified particles uniformly dispersed in the matrix, thereby greatly improving the toughness of the material.

[0024] Meanwhile, trace cerium doping can exert multiple synergistic toughening effects: as a highly efficient nucleating agent, cerium can form heterogeneous nucleation sites in the rPET matrix, effectively refining grains, reducing spherulite size, reducing intergranular defects and internal stress concentration, thereby significantly improving the material's elongation at break and impact toughness; cerium ions can capture free radicals generated during processing, inhibiting the thermo-oxidative degradation of rPET molecular chains, and interact weakly with the terminal carboxyl and hydroxyl groups of rPET, playing a chain-extending effect, making the rPET molecular chains more complete and the mechanical properties better; in addition, cerium doping can introduce lattice distortion and oxygen vacancies into the nano zinc oxide lattice, reducing particle surface energy, further improving the dispersion of particles in the rPET matrix, and avoiding the problem of material brittleness and decreased toughness caused by the addition of inorganic antibacterial fillers.

[0025] In terms of antibacterial properties, cerium doping can effectively regulate the electronic structure and surface activity of nano zinc oxide, enhance its ability to generate active oxygen and inhibit bacteria, and, in conjunction with the core-shell structure, enable the antibacterial particles to be stably dispersed and act slowly, thereby achieving a highly efficient and stable antibacterial effect. Detailed Implementation

[0026] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with embodiments, is provided below.

[0027] Example 1

[0028] A method for preparing a modified PET material includes the following steps:

[0029] The cleaned and thoroughly dried rPET was mixed evenly with antioxidant 1010, silicone powder, and modified particles in a high-speed mixer. The mixture was then melt-blended using a twin-screw extruder and extruded into granules to obtain the modified PET material. The mass ratio of rPET, antioxidant 1010, silicone powder, and modified particles was 93.19:0.21:4:2.6.

[0030] During the extrusion process, the barrel temperature is set sequentially from zone one to zone ten as 220℃, 270℃, 270℃, 265℃, 265℃, 260℃, 250℃, 250℃, 250℃, and 265℃; the screw speed is set to 300 r / min, and the vacuum degree is 0.04 MPa.

[0031] The method for preparing the modified particles includes the following steps:

[0032] S1. Dissolve zinc acetate dihydrate, hexamethylenetetramine, and sodium citrate in deionized water, stir magnetically for 30 min, transfer to a polytetrafluoroethylene-lined reactor, and hydrothermally react at 120℃ for 2 h. Filter, and dry the solid phase in a vacuum drying oven at 60℃ for 5 h to obtain nano-zinc oxide precursor; the mass ratio of zinc acetate dihydrate, hexamethylenetetramine, sodium citrate, and deionized water is 4.9:1.4:0.5:150.

[0033] S2. Dissolve urea in deionized water, add the nano-zinc oxide precursor, ultrasonically disperse for 20 min, add cerium nitrate hexahydrate, heat and stir in a water bath at 65℃ for 2 h, filter, take the solid phase and vacuum dry at 60℃ for 4 h, calcine at 350℃ for 1.5 h to obtain cerium-doped nano-zinc oxide; the mass ratio of urea, deionized water, nano-zinc oxide precursor, and cerium nitrate hexahydrate is 0.12:100:1.5:0.11;

[0034] S3. Disperse the cerium-doped nano-zinc oxide in an ethanol-water solution (anhydrous ethanol and deionized water in a volume ratio of 5:1), add 3% KH570 solution dropwise, adjust the pH of the system to 4 with 0.1 mol / L acetic acid, reflux and stir at 60°C for 6 hours, filter, wash the solid phase, vacuum dry at 65°C for 6 hours, cool to room temperature, grind, and pass through a 200-mesh sieve to obtain modified cerium-doped nano-zinc oxide; the ratio of cerium-doped nano-zinc oxide, ethanol-water solution, and KH570 solution is 1.2 g: 100 mL: 10 mL;

[0035] S4. The modified cerium-doped nano zinc oxide is ultrasonically dispersed in xylene, glycidyl methacrylate and azobisisobutyronitrile are added, and ultrasonic stirring is continued for 20 min. Under a nitrogen atmosphere, the mixture is heated and stirred in an oil bath at 70°C for 10 h. After centrifugation, the solid phase is washed and vacuum dried to obtain the modified particles. The ratio of the modified cerium-doped nano zinc oxide, xylene, glycidyl methacrylate and azobisisobutyronitrile is 1 g: 10 mL: 2.5 g: 0.12 g.

[0036] Example 2

[0037] A method for preparing a modified PET material includes the following steps:

[0038] The cleaned and thoroughly dried rPET was mixed evenly with antioxidant 1010, silicone powder, and modified particles in a high-speed mixer. The mixture was then melt-blended using a twin-screw extruder and extruded into granules to obtain the modified PET material. The mass ratio of rPET, antioxidant 1010, silicone powder, and modified particles was 94.12:0.18:3.5:2.2.

[0039] During the extrusion process, the barrel temperature is set sequentially from zone one to zone ten as 220℃, 270℃, 270℃, 265℃, 265℃, 260℃, 250℃, 250℃, 250℃, and 265℃; the screw speed is set to 350 r / min, and the vacuum degree is 0.06 MPa.

[0040] The method for preparing the modified particles includes the following steps:

[0041] S1. Dissolve zinc acetate dihydrate, hexamethylenetetramine, and sodium citrate in deionized water, stir magnetically for 35 min, transfer to a polytetrafluoroethylene-lined reactor, and hydrothermally react at 120℃ for 2.5 h. Filter, and dry the solid phase in a vacuum drying oven at 60℃ for 6 h to obtain nano-zinc oxide precursor; the mass ratio of zinc acetate dihydrate, hexamethylenetetramine, sodium citrate, and deionized water is 5.1:1.5:0.55:150.

[0042] S2. Dissolve urea in deionized water, add the nano-zinc oxide precursor, ultrasonically disperse for 30 min, add cerium nitrate hexahydrate, heat and stir in a water bath at 70℃ for 3 h, filter, take the solid phase and vacuum dry at 60℃ for 5 h, calcine at 400℃ for 2.0 h to obtain cerium-doped nano-zinc oxide; the mass ratio of urea, deionized water, nano-zinc oxide precursor, and cerium nitrate hexahydrate is 0.14:100:1.6:0.12;

[0043] S3. Disperse the cerium-doped nano-zinc oxide in an ethanol-water solution (anhydrous ethanol and deionized water in a volume ratio of 5:1), add 3% KH570 solution dropwise, adjust the pH of the system to 5 with 0.1 mol / L acetic acid, reflux and stir at 60°C for 7 hours, filter, wash the solid phase, vacuum dry at 65°C for 7 hours, cool to room temperature, grind, and pass through a 200-mesh sieve to obtain modified cerium-doped nano-zinc oxide; the ratio of cerium-doped nano-zinc oxide, ethanol-water solution, and KH570 solution is 1.35 g: 125 mL: 15 mL;

[0044] S4. The modified cerium-doped nano zinc oxide was ultrasonically dispersed in xylene, glycidyl methacrylate and azobisisobutyronitrile were added, and ultrasonic stirring was continued for 25 min. The mixture was then heated and stirred in an oil bath at 70°C for 11 h under a nitrogen atmosphere. After centrifugation, the solid phase was washed and vacuum dried to obtain the modified particles. The ratio of the modified cerium-doped nano zinc oxide, xylene, glycidyl methacrylate and azobisisobutyronitrile was 1.1 g: 12 mL: 2.9 g: 0.13 g.

[0045] Example 3

[0046] A method for preparing a modified PET material includes the following steps:

[0047] The cleaned and thoroughly dried rPET is mixed evenly with antioxidant 1010, silicone powder, and modified particles in a high-speed mixer. The mixture is then melt-blended using a twin-screw extruder and extruded into granules to obtain the modified PET material. The mass ratio of rPET, antioxidant 1010, silicone powder, and modified particles is 95.05:0.15:3:1.8.

[0048] During the extrusion process, the barrel temperature is set sequentially from zone one to zone ten as 220℃, 270℃, 270℃, 265℃, 265℃, 260℃, 250℃, 250℃, 250℃, and 265℃; the screw speed is set to 400 r / min, and the vacuum degree is 0.08 MPa.

[0049] The method for preparing the modified particles includes the following steps:

[0050] S1. Dissolve zinc acetate dihydrate, hexamethylenetetramine, and sodium citrate in deionized water, stir magnetically for 40 min, transfer to a polytetrafluoroethylene-lined reactor, and hydrothermally react at 120℃ for 3 h. Filter, and dry the solid phase in a vacuum drying oven at 60℃ for 7 h to obtain nano-zinc oxide precursor; the mass ratio of zinc acetate dihydrate, hexamethylenetetramine, sodium citrate, and deionized water is 5.2:1.6:0.6:150.

[0051] S2. Dissolve urea in deionized water, add the nano-zinc oxide precursor, ultrasonically disperse for 40 min, add cerium nitrate hexahydrate, heat and stir in a water bath at 75℃ for 4 h, filter, take the solid phase and vacuum dry at 60℃ for 6 h, calcine at 450℃ for 2.5 h to obtain cerium-doped nano-zinc oxide; the mass ratio of urea, deionized water, nano-zinc oxide precursor, and cerium nitrate hexahydrate is 0.15:100:1.8:0.13;

[0052] S3. Disperse the cerium-doped nano-zinc oxide in an ethanol-water solution (anhydrous ethanol and deionized water in a volume ratio of 5:1), add 3% KH570 solution dropwise, adjust the pH of the system to 6 with 0.1 mol / L acetic acid, reflux and stir at 60°C for 8 hours, filter, wash the solid phase, vacuum dry at 65°C for 8 hours, cool to room temperature, grind, and pass through a 200-mesh sieve to obtain modified cerium-doped nano-zinc oxide; the ratio of cerium-doped nano-zinc oxide, ethanol-water solution, and KH570 solution is 1.5 g: 150 mL: 20 mL;

[0053] S4. The modified cerium-doped nano zinc oxide is ultrasonically dispersed in xylene, glycidyl methacrylate and azobisisobutyronitrile are added, and ultrasonic stirring is continued for 30 min. Under a nitrogen atmosphere, the mixture is heated and stirred in an oil bath at 70°C for 12 h. After centrifugation, the solid phase is washed and vacuum dried to obtain the modified particles. The ratio of the modified cerium-doped nano zinc oxide, xylene, glycidyl methacrylate and azobisisobutyronitrile is 1.2 g: 15 mL: 3.2 g: 0.15 g.

[0054] Comparative Example 1

[0055] The difference from Example 2 is that the preparation method of the modified particles includes the following steps:

[0056] S1. Dissolve zinc acetate dihydrate, hexamethylenetetramine, and sodium citrate in deionized water, stir magnetically for 35 min, transfer to a polytetrafluoroethylene-lined reactor, and hydrothermally react at 120℃ for 2.5 h. Filter, dry the solid phase in a vacuum drying oven at 60℃ for 6 h, and calcine at 400℃ for 2.0 h to obtain nano-zinc oxide; the mass ratio of zinc acetate dihydrate, hexamethylenetetramine, sodium citrate, and deionized water is 5.1:1.5:0.55:150.

[0057] S2. Disperse the nano-zinc oxide in an ethanol-water solution (anhydrous ethanol and deionized water in a volume ratio of 5:1), add 3% KH570 solution dropwise, adjust the pH of the system to 5 with 0.1 mol / L acetic acid, reflux and stir at 60°C for 7 hours, filter, wash the solid phase, vacuum dry at 65°C for 7 hours, cool to room temperature, grind, and pass through a 200-mesh sieve to obtain modified nano-zinc oxide; the ratio of nano-zinc oxide, ethanol-water solution, and KH570 solution is 1.35 g: 125 mL: 15 mL;

[0058] S3. The modified nano zinc oxide is ultrasonically dispersed in xylene, glycidyl methacrylate and azobisisobutyronitrile are added, and ultrasonic stirring is continued for 25 min. Under nitrogen atmosphere, it is heated and stirred in an oil bath at 70°C for 11 h. After centrifugation, the solid phase is washed and vacuum dried to obtain the modified particles. The ratio of the modified nano zinc oxide, xylene, glycidyl methacrylate and azobisisobutyronitrile is 1.1 g: 12 mL: 2.9 g: 0.13 g.

[0059] Comparative Example 2

[0060] The difference from Example 2 is that the preparation method of the modified particles includes the following steps:

[0061] S1. Dissolve zinc acetate dihydrate, hexamethylenetetramine, and sodium citrate in deionized water, stir magnetically for 35 min, transfer to a polytetrafluoroethylene-lined reactor, and hydrothermally react at 120℃ for 2.5 h. Filter, and dry the solid phase in a vacuum drying oven at 60℃ for 6 h to obtain nano-zinc oxide precursor; the mass ratio of zinc acetate dihydrate, hexamethylenetetramine, sodium citrate, and deionized water is 5.1:1.5:0.55:150.

[0062] S2. Dissolve urea in deionized water, add the nano-zinc oxide precursor, ultrasonically disperse for 30 min, add cerium nitrate hexahydrate, heat and stir in a water bath at 70℃ for 3 h, filter, take the solid phase and vacuum dry at 60℃ for 5 h, calcine at 400℃ for 2.0 h to obtain cerium-doped nano-zinc oxide; the mass ratio of urea, deionized water, nano-zinc oxide precursor, and cerium nitrate hexahydrate is 0.14:100:1.6:0.12;

[0063] S3. Disperse the cerium-doped nano-zinc oxide in an ethanol-water solution (anhydrous ethanol and deionized water in a volume ratio of 5:1), add 3% KH570 solution dropwise, adjust the pH of the system to 5 with 0.1 mol / L acetic acid, reflux and stir at 60°C for 7 hours, filter, wash the solid phase, vacuum dry at 65°C for 7 hours, cool to room temperature, grind, and pass through a 200-mesh sieve to obtain the modified particles; the ratio of cerium-doped nano-zinc oxide, ethanol-water solution, and KH570 solution is 1.35 g: 125 mL: 15 mL.

[0064] Performance testing

[0065] The mechanical and antibacterial properties of the modified PET materials prepared in Examples 1-3 and Comparative Examples 1-2 were tested, and the test results are shown in Table 1 below.

[0066] Table 1

[0067]

[0068] As shown in Table 1, the PET materials prepared in the various embodiments of the present invention have good mechanical properties and antibacterial effects. By using cerium-doped nano-zinc oxide grafted with KH570 and glycidyl methacrylate polymer, a structure is formed with cerium-doped nano-zinc oxide as the core layer and glycidyl methacrylate polymer shell coating on the surface. This results in strong bonding and uniform dispersion of inorganic particles at the rPET interface, significantly improved toughness, and significantly higher elongation at break and impact strength compared to the comparative example. Cerium doping significantly enhances the antibacterial activity of nano-zinc oxide, and the modified particles are uniformly dispersed in the matrix, achieving an antibacterial rate >99%.

[0069] The lack of cerium doping in Comparative Example 1 resulted in low antibacterial activity of the nano zinc oxide.

[0070] This invention refines grains by using trace amounts of cerium doping as a highly efficient nucleating agent, forming heterogeneous nucleation points in the PET matrix, reducing intergranular defects and stress concentration, thereby significantly improving elongation at break and impact toughness. Cerium can capture free radicals and inhibit thermal degradation, while also interacting weakly with the terminal carboxyl / hydroxyl groups of PET, resulting in a chain-extending effect that makes the rPET molecular chain more complete and tougher. Cerium doping introduces lattice distortion and oxygen vacancies into the nano zinc oxide lattice, reducing particle surface energy, making the modified particles more uniformly dispersed in PET, and avoiding the problem of brittleness caused by the addition of inorganic fillers.

[0071] Comparative Example 2 shows that the ungrafted glycidyl methacrylate polymer has weak interfacial bonding with PET, resulting in reduced toughness.

[0072] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for preparing a modified PET material, characterized in that, Includes the following steps: rPET is mixed evenly with antioxidants, lubricants, and modified particles in a high-speed mixer, and then melt-blended and extruded using a twin-screw extruder to obtain the modified PET material. The modified particles consist of a cerium-doped nano-zinc oxide core layer and a surface coated with a glycidyl methacrylate polymer shell structure.

2. The method for preparing a modified PET material according to claim 1, characterized in that, The mass ratio of rPET, antioxidant, lubricant, and modified particles is 93.19-95.05:0.15-0.21:3-4:1.8-2.

6.

3. The method for preparing a modified PET material according to claim 1, characterized in that, The method for preparing the modified particles includes the following steps: S1. Dissolve zinc source, template agent and complexing agent in deionized water, stir magnetically, transfer to polytetrafluoroethylene-lined reactor, hydrothermally react at 120℃ for 2-3 hours, filter, take solid phase and vacuum dry to obtain nano zinc oxide precursor. S2. Dissolve urea in deionized water, add the nano zinc oxide precursor, disperse ultrasonically, add cerium source, heat and stir in a water bath, filter, take the solid phase, vacuum dry, and calcine to obtain cerium-doped nano zinc oxide. S3. Disperse the cerium-doped nano zinc oxide in an ethanol aqueous solution, add KH570 solution dropwise, adjust the pH of the system to 4-6, reflux and heat at 60℃ for 6-8 hours, filter, wash the solid phase, vacuum dry, cool to room temperature, grind, and sieve to obtain modified cerium-doped nano zinc oxide. S4. The modified cerium-doped nano zinc oxide is ultrasonically dispersed in xylene, glycidyl methacrylate and an initiator are added, and ultrasonic stirring is continued. The mixture is heated and stirred in an oil bath at 70°C for 10-12 hours under a nitrogen atmosphere. After centrifugation, the solid phase is washed and vacuum dried to obtain the modified particles.

4. The method for preparing a modified PET material according to claim 3, characterized in that, In step S1, the mass ratio of the zinc source, template agent, complexing agent and deionized water is 4.9-5.2:1.4-1.6:0.5-0.6:

150.

5. The method for preparing a modified PET material according to claim 3, characterized in that, In step S2, the mass ratio of urea, deionized water, nano zinc oxide precursor, and cerium source is 0.12-0.15:100:1.5-1.8:0.11-0.

13.

6. The method for preparing a modified PET material according to claim 3, characterized in that, In step S2, calcination refers to calcination at 350-450℃ for 1.5-2.5 hours.

7. The method for preparing a modified PET material according to claim 3, characterized in that, In step S3, the ratio of cerium-doped nano zinc oxide, ethanol aqueous solution, and KH570 solution is 1.2-1.5g: 100-150mL: 10-20mL.

8. The method for preparing a modified PET material according to claim 3, characterized in that, In step S4, the ratio of the modified cerium-doped nano zinc oxide, xylene, glycidyl methacrylate and initiator is 1-1.2g: 10-15mL: 2.5-3.2g: 0.12-0.15g.

9. A modified PET material prepared by the preparation method according to any one of claims 1-8.

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