CN115785629A - Modified PET packaging material with high barrier property and preparation method thereof - Google Patents
Modified PET packaging material with high barrier property and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a modified PET (polyethylene terephthalate) packaging material with high barrier property, belonging to the technical field of packaging materials and comprising the following raw materials in parts by weight: 90-100 parts of PET resin, 10-12 parts of auxiliary agent, 1-1.4 parts of modified nano montmorillonite, 0.3-0.5 part of antioxidant and 0.5-0.6 part of lubricant. According to the invention, the auxiliary agent is added into the PET material, the auxiliary agent is poly (4-methyl-1 pentene) subjected to maleic anhydride grafting treatment, and a polar group is introduced into a molecular chain, so that the compatibility with the PET base material is improved, and the barrier property and flexibility of the material to light are further improved; the nano-montmorillonite is modified, an organic molecular chain is grafted on the surface of the montmorillonite, the agglomeration phenomenon of the montmorillonite is improved, the organic molecular chain contains a plurality of ester groups, and the ester groups have good compatibility with a PET matrix, so that the uniform dispersion of the montmorillonite in the PET is promoted, and the barrier property, the heat resistance and the mechanical property of the packaging material are further improved.
Description
Technical Field
The invention belongs to the technical field of packaging materials, and particularly relates to a modified PET packaging material with high barrier property and a preparation method thereof.
Background
Polyester films are generally colorless and transparent, have luster, high toughness and good elasticity, have the advantages of high relative density, high tensile strength, moderate elongation and the like compared with other plastic films, and are widely used as packaging materials. However, because the polyester film has poor barrier properties against gases such as water and oxygen, the polyester film is easy to change packages due to the influence of moisture, oxygen and microorganisms as a packaging material, and the application of the polyester film in the field of food and medicine packaging is seriously influenced. PET (polyethylene terephthalate) is the most widely applied material in polyester materials, so that the barrier property of PET is improved, and the PET is a great breakthrough in the field of packaging materials.
The Chinese patent with patent publication number CN101200575A discloses a preparation method of montmorillonite modified polyester, which comprises the following steps: (a) Providing an aqueous mixture of 1-4 parts by weight of montmorillonite raw soil and 50-80 parts by weight of ethylene glycol in 50-500 parts by weight of water (b) mixing the aqueous mixture obtained in the step (a) with 40-50 parts by weight of dimethyl terephthalate to obtain a mixture; (c) Polymerizing the mixture obtained in the step (b) at 160-290 ℃ to obtain the montmorillonite modified polyester. The PET barrier property is improved by adding the montmorillonite filler in the PET polycondensation process. The problem of the nanoparticle blending method is that the nanofiller is easily agglomerated in a matrix with poor compatibility, resulting in significant reduction of mechanical properties. In addition, there are also barrier composites made by multilayer blending, typically consisting of a combination of a base material, a barrier material and an adhesive material. The polyester used as the matrix tends to be incompatible with the barrier polyester, with very low interlayer adhesion, and the selection of a suitable compatibilizer is required to improve the interfacial bond. In addition, the barrier property and heat resistance of the PET packaging material cannot meet the requirements of the product to be packaged on the packaging material.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a modified PET packaging material with high barrier property and a preparation method thereof.
According to the invention, the auxiliary agent is added into the PET material, the auxiliary agent is poly (4-methyl-1 pentene) subjected to maleic anhydride grafting treatment, and polar groups are introduced on the molecular chain of the poly (4-methyl-1 pentene), so that the compatibility with the PET base material is improved, and further the barrier property of the material to light and the flexibility of the material are improved; the nano-montmorillonite is modified, an organic molecular chain is grafted on the surface of the montmorillonite, the agglomeration phenomenon of the montmorillonite is improved, the organic molecular chain contains a plurality of ester groups, and the ester groups have good compatibility with a PET matrix, so that the uniform dispersion of the montmorillonite in the PET is promoted, and the barrier property, the heat resistance and the mechanical property of the packaging material are improved; in addition, the quaternary ammonium salt groups are contained on the organic molecular chains, so that the packaging material can have antibacterial property, the protection effect of multiple packages is improved, and the durability of the packaging material is improved.
The purpose of the invention can be realized by the following technical scheme:
a modified PET packaging material with high barrier property comprises the following raw materials in parts by weight: 90-100 parts of PET resin, 10-12 parts of auxiliary agent, 1-1.4 parts of modified nano montmorillonite, 0.3-0.5 part of antioxidant and 0.5-0.6 part of lubricant.
Further, the antioxidant is one of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], tris [2, 4-di-tert-butylphenyl ] phosphite and n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate; the lubricant is one of polyethylene wax, stearic acid amide, methylene bis stearic acid amide, N-ethylene bis stearic acid amide and pentaerythritol stearate.
A preparation method of a modified PET packaging material with high barrier property comprises the following specific steps:
according to the weight portion ratio, the PET resin, the auxiliary agent, the modified nano montmorillonite, the antioxidant and the lubricant are melted, blended, extruded and molded, and then subjected to biaxial tension to obtain the modified PET packaging material.
Further, the auxiliary agent is prepared by the following steps:
adding poly (4-methyl-1 pentene) into epoxidized soybean oil, stirring for 10min, sealing and swelling for 24h to obtain a swelling solution; dissolving maleic anhydride and DCP (dicumyl peroxide) in a water bath at 50 ℃ by using a small amount of dimethylbenzene, continuously stirring in the dissolving process, adding the mixture into a swelling solution while the mixture is hot after the mixture is completely dissolved, stirring for pre-dispersion, adding the mixture into a torque rheometer for melt grafting, and controlling the melting temperature to be 175 ℃ and the time to be 1h to obtain an auxiliary agent; the mass ratio of the poly (4-methyl-1 pentene), the maleic anhydride and the DCP is 100; the addition amount of the epoxidized soybean oil is 1.5 percent of the mass of the poly (4-methyl-1 pentene);
after the poly (4-methyl-1 pentene) is grafted and modified by maleic anhydride, a polar group is introduced on a molecular chain, and the polar group has better compatibility with a PET matrix, so that the poly (4-methyl-1 pentene) and the PET can be better dispersed and fused uniformly; on one hand, the compatibility is good, the dispersed particle size of the poly (4-methyl-1 pentene) is reduced, the interface area is increased, and light rays are refracted more times in the transmission process to enable the whole material to have stronger light resistance; on the other hand, the refractive index difference between the poly (4-methyl-1 pentene) and the PET is about 0.2, light can be obviously refracted at the interface to change the light path, and the light can be refracted for many times among a plurality of dispersed particles to greatly weaken the penetrability of the light, so that the light resistance of the PET is improved;
in addition, the poly (4-methyl-1 pentene) can play a role in toughening the PET so as to improve the flexibility of the packaging material to a certain extent.
Further, the modified nano montmorillonite is prepared by the following steps:
s1, adding 4-hydroxybutyl acrylate, 2-picolinic acid and toluene into a round-bottom flask, adding p-toluenesulfonic acid (catalyst) and phenothiazine (polymerization inhibitor), uniformly mixing, placing into a microwave reactor, connecting a water separator and a reflux condenser tube, carrying out reflux reaction for 26-30min at the temperature of 110 ℃ under the microwave power of 700W, washing for 3-4 times by using a saturated sodium carbonate solution, and drying by using anhydrous sodium sulfate to obtain a modifier; the dosage ratio of 4-hydroxybutyl acrylate, 2-picolinic acid, toluene, p-toluenesulfonic acid and phenothiazine is 10mmol;
4-hydroxybutyl acrylate and 2-picolinic acid are subjected to esterification reaction to obtain the modifier, and the reaction equation is as follows:
s2, sieving the nano montmorillonite with a 100-mesh sieve, mixing the nano montmorillonite with a hydrogen peroxide solution (the mass fraction is 30%) according to a solid-to-liquid ratio of 1g; mixing the pretreated montmorillonite with DMF, adding benzoyl peroxide, performing ultrasound treatment at normal temperature for 30min, adding a modifier, raising the temperature to 85 ℃, reacting for 4h, performing suction filtration and acetone repeated washing, and finally placing the product in a vacuum oven at 60 ℃ for drying for 12h to obtain the pre-modified nano montmorillonite; the dosage ratio of the pretreated montmorillonite, DMF, benzoyl peroxide and modifier is 1 g;
after the nano montmorillonite is oxidized by hydrogen peroxide, a large amount of-OH is formed on the surface, and under the action of benzoyl peroxide, the-OH on the surface of the nano montmorillonite and-C = C on a modifier molecule are subjected to chemical reaction, so that a modifier molecular chain is grafted on the surface of the nano montmorillonite, and the specific reaction process is as follows:
s3, mixing the pre-modified montmorillonite and trichloromethane, performing ultrasonic treatment for 30min, adding bromobutane, raising the temperature to 70 ℃, performing reflux reaction for 12h at the temperature, performing suction filtration after the product is cooled to room temperature, repeatedly washing the product with ethanol and deionized water in sequence, and finally drying the product in a vacuum oven at 60 ℃ for 12h to obtain modified nano montmorillonite; the dosage ratio of the pre-modified montmorillonite to the trichloromethane to the bromobutane is 1 g;
the pre-modified montmorillonite is grafted with a modifier molecular chain, the modifier molecular chain contains a plurality of ester groups and pyridine rings, the introduced pyridine rings and bromobutane are subjected to quaternization reaction to obtain quaternary ammonium salt, and the reaction process is as follows:
after the modified montmorillonite is modified, an organic molecular chain is introduced to the surface, so that the agglomeration phenomenon among the nano montmorillonite can be weakened; the introduced organic molecular chain contains a plurality of ester groups, has good compatibility with a PET matrix, and can promote uniform dispersion in PET; the montmorillonite has a unique two-dimensional layered structure, is uniformly dispersed in the PET, and can improve the tensile strength and toughness of the PET and improve the heat resistance of the PET; the lamellar nano montmorillonite is uniformly dispersed in the PET, and can form a lamellar protection structure, so that the transmission of water molecules or gas is blocked, and the blocking performance of the PET is improved; in addition, the molecular chain grafted on the surface of the montmorillonite contains a quaternary ammonium salt structure, the quaternary ammonium salt has the characteristics of good antibacterial performance and strong stability, and can endow the PET material with certain antibacterial performance, and when the material with the antibacterial performance is applied to packaging, the material can effectively resist the infection of microorganisms such as bacteria and the like, the protective performance of a packaged product is improved, and the durability of the packaging material is also improved.
The invention has the beneficial effects that:
according to the invention, the auxiliary agent is added into the PET material, the auxiliary agent is poly (4-methyl-1 pentene) which is grafted by maleic anhydride, and a polar group is introduced into a molecular chain of the poly (4-methyl-1 pentene), so that the compatibility with the PET base material is improved, and further, the barrier property of the material to light and the flexibility of the material are improved; the nano-montmorillonite is modified, an organic molecular chain is grafted on the surface of the montmorillonite, the agglomeration phenomenon of the montmorillonite is improved, the organic molecular chain contains a plurality of ester groups, and the ester groups have good compatibility with a PET matrix, so that the uniform dispersion of the montmorillonite in the PET is promoted, and the barrier property, the heat resistance and the mechanical property of the packaging material are improved; in addition, the quaternary ammonium salt group is contained on the organic molecular chain, so that the packaging material can have an antibacterial property, the protection effect of multiple packaging products is increased, and the durability of the packaging material is improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Preparing an auxiliary agent:
adding 100g of poly (4-methyl-1 pentene) into 1.5g of epoxidized soybean oil, stirring for 10min, and swelling in a sealed manner for 24h to obtain a swelling solution; dissolving 4g of maleic anhydride and 0.7g of DCP (dicumyl peroxide) in 10mL of dimethylbenzene in a water bath at 50 ℃, continuously stirring in the dissolving process, adding the mixture into a swelling solution while the mixture is hot after the mixture is completely dissolved, stirring for pre-dispersion, adding the mixture into a torque rheometer for melt grafting, controlling the melting temperature to be 175 ℃ and the time to be 1 hour, and obtaining the auxiliary agent.
Example 2
Preparing an auxiliary agent:
adding 200g of poly (4-methyl-1 pentene) into 3g of epoxidized soybean oil, stirring for 10min, and sealing and swelling for 24h to obtain a swelling solution; dissolving 8g of maleic anhydride and 1.4g of DCP (dicumyl peroxide) in 20mL of dimethylbenzene in a water bath at 50 ℃, continuously stirring in the dissolving process, adding the mixture into a swelling solution while the mixture is hot after the mixture is completely dissolved, stirring for pre-dispersion, adding the mixture into a torque rheometer for melt grafting, and controlling the melting temperature to be 175 ℃ and the time to be 1h to obtain the assistant.
Example 3
Preparing modified nano montmorillonite:
s1, adding 10mmol of 4-hydroxybutyl acrylate, 12mmol of 2-picolinic acid and 180mL of toluene into a round-bottom flask, adding 1.0g of p-toluenesulfonic acid (catalyst) and 0.7g of phenothiazine (polymerization inhibitor), uniformly mixing, placing into a microwave reactor, connecting a water separator and a reflux condenser tube, carrying out reflux reaction for 26min at the microwave power of 700W and the temperature of 110 ℃, washing for 3 times by using a saturated sodium carbonate solution, and drying by using anhydrous sodium sulfate to obtain a modifier;
s2, sieving the nano montmorillonite with a 100-mesh sieve, mixing the nano montmorillonite with a hydrogen peroxide solution (mass fraction is 30%) according to a solid-to-liquid ratio of 1g; mixing 10g of pretreated montmorillonite with 800mL of DMF, adding 1g of benzoyl peroxide, carrying out ultrasonic treatment at normal temperature for 30min, adding 25g of modifier, raising the temperature to 85 ℃, reacting for 4h, carrying out suction filtration and acetone repeated washing, and finally drying the product in a vacuum oven at 60 ℃ for 12h to obtain the pre-modified nano montmorillonite;
and S3, mixing 10g of pre-modified montmorillonite with 1L of trichloromethane, performing ultrasonic treatment for 30min, adding 22g of bromobutane, raising the temperature to 70 ℃, performing reflux reaction for 12h at the temperature, performing suction filtration after the product is cooled to room temperature, repeatedly washing the product with ethanol and deionized water, and finally drying the product in a vacuum oven at 60 ℃ for 12h to obtain the modified nano montmorillonite.
Example 4
Preparing modified nano montmorillonite:
s1, adding 10mmol of 4-hydroxybutyl acrylate, 14mmol of 2-picolinic acid and 180mL of toluene into a round-bottom flask, adding 1.0g of p-toluenesulfonic acid (catalyst) and 0.7g of phenothiazine (polymerization inhibitor), uniformly mixing, placing into a microwave reactor, connecting a water separator and a reflux condenser tube, carrying out reflux reaction for 30min at the microwave power of 700W and the temperature of 110 ℃, washing for 4 times by using a saturated sodium carbonate solution, and drying by using anhydrous sodium sulfate to obtain a modifier;
s2, sieving the nano montmorillonite with a 100-mesh sieve, mixing the nano montmorillonite with a hydrogen peroxide solution (the mass fraction is 30%) according to a solid-to-liquid ratio of 1g; mixing 10g of pretreated montmorillonite with 800mL of DMF, adding 1g of benzoyl peroxide, carrying out ultrasonic treatment at normal temperature for 30min, adding 27g of modifier, raising the temperature to 85 ℃, reacting for 4h, carrying out suction filtration and acetone repeated washing, and finally placing the product in a vacuum oven at 60 ℃ for drying for 12h to obtain the pre-modified nano montmorillonite;
and S3, mixing 10g of pre-modified montmorillonite with 1L of trichloromethane, performing ultrasonic treatment for 30min, adding 22g of bromobutane, raising the temperature to 70 ℃, performing reflux reaction for 12h at the temperature, performing suction filtration after the product is cooled to room temperature, repeatedly washing the product with ethanol and deionized water, and finally drying the product in a vacuum oven at 60 ℃ for 12h to obtain the modified nano montmorillonite.
Example 5
A modified PET packaging material with high barrier property comprises the following raw materials: 90g of PET resin, 10g of auxiliary agent, 1g of modified nano montmorillonite, 0.3g of antioxidant and 0.5g of lubricant;
the antioxidant is tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester; the lubricant is polyethylene wax;
and (3) melting, blending and extruding the PET resin, the auxiliary agent, the modified nano montmorillonite, the antioxidant and the lubricant, and performing biaxial tension to obtain the modified PET packaging material.
Example 6
A modified PET packaging material with high barrier property comprises the following raw materials: 95g of PET resin, 11g of auxiliary agent, 1.2g of modified nano montmorillonite, 0.4g of antioxidant and 0.55g of lubricant;
the antioxidant is tris [2, 4-di-tert-butylphenyl ] phosphite; the lubricant is stearic acid amide;
and (3) melting, blending and extruding the PET resin, the auxiliary agent, the modified nano montmorillonite, the antioxidant and the lubricant, and performing biaxial tension to obtain the modified PET packaging material.
Example 7
A modified PET packaging material with high barrier property comprises the following raw materials: 100g of PET resin, 12g of auxiliary agent, 1.4g of modified nano montmorillonite, 0.5g of antioxidant and 0.6g of lubricant;
the antioxidant is one of beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid n-octadecyl alcohol ester; the lubricant is methylene bis stearamide;
and (3) melting, blending and extruding the PET resin, the auxiliary agent, the modified nano montmorillonite, the antioxidant and the lubricant, and performing biaxial tension to obtain the modified PET packaging material.
Comparative example 1
The auxiliary agent in example 5 was replaced by poly (4-methyl-1 pentene), and the remaining raw materials and preparation were unchanged.
Comparative example 2
The modified nano-montmorillonite in the example 5 is changed into the common nano-montmorillonite without any treatment, and the rest raw materials and the preparation process are not changed.
Comparative example 3
PET resin.
The PET packaging materials obtained in examples 5 to 7 and comparative examples 1 to 3 were subjected to the following property tests:
testing the initial decomposition temperature of the material by a thermogravimetric test method;
testing the tensile property of the material by adopting a tensile testing machine, wherein the tensile property comprises the determination of tensile strength and elongation at break;
an oxygen permeability tester is adopted to test the oxygen permeability of the material according to the GB/T1038 standard method; testing the moisture permeability of the material by adopting a water vapor permeability tester according to a GB/T1037 standard method;
testing the bacteriostatic effect of the material on escherichia coli and staphylococcus aureus by using a bacteriostatic ring method;
the measured performance parameters are shown in the following table:
as can be seen from the data in the table above, the PET packaging material prepared by the invention has high heat resistance (the initial decomposition temperature is higher than 286 ℃) and high mechanical strength (the tensile strength is higher than 55MPa, and the elongation at break is higher than 362%), and has excellent barrier property; according to the data of the comparative example 2, the nano montmorillonite can be uniformly dispersed in the PET material after modification treatment, so that the effects of enhancing the mechanical property, the barrier property and the heat resistance can be exerted; meanwhile, the modified nano montmorillonite can endow the material with good antibacterial performance; the data of comparative example 1 show that the addition of the auxiliary agent can improve the toughness of the material to some extent.
In the description of the specification, reference to the description of "one embodiment," "an example," "a specific example" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.
Claims (9)
1. A modified PET packaging material with high barrier property is characterized by comprising the following raw materials in parts by weight: 90-100 parts of PET resin, 10-12 parts of auxiliary agent, 1-1.4 parts of modified nano montmorillonite, 0.3-0.5 part of antioxidant and 0.5-0.6 part of lubricant.
2. The modified PET packaging material with high barrier property as claimed in claim 1, wherein the antioxidant is one of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], tris [2, 4-di-tert-butylphenyl ] phosphite and n-octadecyl-beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate; the lubricant is one of polyethylene wax, stearic acid amide, methylene bis-stearic acid amide, N-ethylene bis-stearic acid amide and pentaerythritol stearate.
3. The modified PET packaging material with high barrier property as claimed in claim 1, wherein the auxiliary agent is prepared by the following steps:
adding poly (4-methyl-1 pentene) into epoxidized soybean oil, stirring for 10min, sealing and swelling for 24h to obtain a swelling solution; dissolving maleic anhydride and DCP (dicumyl peroxide) with a small amount of dimethylbenzene in a water bath at 50 ℃, continuously stirring in the dissolving process, adding the mixture into a swelling solution while the mixture is hot after the mixture is completely dissolved, stirring for pre-dispersion, adding the mixture into a torque rheometer for melt grafting, and controlling the melting temperature to be 175 ℃ and the time to be 1h to obtain the assistant.
4. The modified PET packaging material with high barrier property as claimed in claim 3, wherein the dosage mass ratio of poly (4-methyl-1 pentene), maleic anhydride and DCP is 100; the addition amount of epoxidized soybean oil was 1.5% by mass of poly (4-methyl-1-pentene).
5. The modified PET packaging material with high barrier property as claimed in claim 1, wherein the modified nano montmorillonite is prepared by the following steps:
s1, adding 4-hydroxybutyl acrylate, 2-picolinic acid and toluene into a round-bottom flask, adding p-toluenesulfonic acid and phenothiazine, uniformly mixing, placing into a microwave reactor, connecting a water separator and a reflux condenser pipe, carrying out reflux reaction for 26-30min at the microwave power of 700W and the temperature of 110 ℃, washing for 3-4 times by using a saturated sodium carbonate solution, and drying by using anhydrous sodium sulfate to obtain a modifier;
s2, sieving the nano montmorillonite with a 100-mesh sieve, mixing the nano montmorillonite with a hydrogen peroxide solution according to a solid-to-liquid ratio of 1g to 50mL, raising the temperature to 80-100 ℃, carrying out oxidation treatment for 30min, carrying out suction filtration, and repeatedly washing with deionized water to obtain pretreated montmorillonite; mixing the pretreated montmorillonite with DMF, adding benzoyl peroxide, performing ultrasound treatment at normal temperature for 30min, adding a modifier, raising the temperature to 85 ℃, reacting for 4h, performing suction filtration and acetone repeated washing, and finally placing the product in a vacuum oven at 60 ℃ for drying for 12h to obtain the pre-modified nano montmorillonite;
and S3, mixing the pre-modified montmorillonite and trichloromethane, performing ultrasonic treatment for 30min, adding bromobutane, raising the temperature to 70 ℃, performing reflux reaction for 12h at the temperature, performing suction filtration after the product is cooled to room temperature, repeatedly washing the product by using ethanol and deionized water, and finally drying the product in a vacuum oven at the temperature of 60 ℃ for 12h to obtain the modified nano montmorillonite.
6. The modified PET packaging material with high barrier property as claimed in claim 5, wherein the ratio of the used amount of 4-hydroxybutyl acrylate, 2-picolinic acid, toluene, p-toluenesulfonic acid and phenothiazine in step S1 is 10mmol.
7. The modified PET packaging material with high barrier property as claimed in claim 5, wherein the dosage ratio of the pretreated montmorillonite, DMF, benzoyl peroxide and modifier in step S2 is 1 g/80mL.
8. The modified PET packaging material with high barrier property as claimed in claim 5, wherein the dosage ratio of the pre-modified montmorillonite, the trichloromethane and the bromobutane in the step S3 is 1 g.
9. The preparation method of the modified PET packaging material with high barrier property according to claim 1 is characterized by comprising the following specific steps:
according to the weight portion ratio, the PET resin, the auxiliary agent, the modified nano montmorillonite, the antioxidant and the lubricant are melted, blended and extruded for molding, and then the modified PET packaging material is obtained by biaxial stretching.
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