A preparation process for a high-barrier recyclable PE packaging film

Abstract

This invention relates to the field of functional packaging material research and development technology, and discloses a preparation process for a high-barrier recyclable PE packaging film, comprising: synthesizing a flame-retardant crosslinking monomer and a flame-retardant light stabilizer; modifying graphene nanosheets with the flame-retardant crosslinking monomer or a combination of the flame-retardant crosslinking monomer and the flame-retardant light stabilizer to prepare modified graphene nanosheets; uniformly dispersing the modified graphene nanosheets in an ethylene-vinyl alcohol copolymer matrix to prepare a functional barrier material; finally introducing the functional barrier material into a PE co-extruded film, and using an eleven-layer co-extrusion blow molding process to prepare an eleven-layer co-extruded film of single PE material with a thickness of 50-200 μm. This invention provides a preparation process for an eleven-layer co-extruded film of single PE material, and obtains a recyclable PE packaging film with excellent barrier properties, which can be used in the dairy product packaging field.

Description

Technical Field

[0001] This invention relates to the field of functional packaging material research and development technology, specifically to a preparation process for a high-barrier recyclable PE packaging film. Background Technology

[0002] Plastic packaging has become one of the mainstream packaging forms for dairy products due to its advantages such as being lightweight, transparent, shatterproof, and easily moldable. Among them, PE packaging film is the most widely used in the dairy product packaging field because it is non-toxic, odorless, chemically stable, has excellent low-temperature resistance, good electrical insulation, and low water absorption. Currently, PE packaging products on the market are often made of multiple layers or composite materials. In the composition of composite materials, there are not only plastic layers, but also aluminum foil, coatings, and other materials that are difficult to separate. This makes the sorting and classification process of PE packaging film after use cumbersome and difficult, and the recycling rate is low. Improper disposal and indiscriminate disposal can cause serious environmental pollution and resource waste.

[0003] High-barrier single-material PE plastic packaging films produced by multi-layer co-extrusion do not require sorting during recycling and can be repeatedly reused, gradually becoming a trend in the packaging industry. For example, Chinese patent CN115447241A discloses a high-barrier single-material recyclable PE packaging film prepared by multi-layer co-extrusion, which has high recycling efficiency and practical application value.

[0004] Existing technologies have reported the use of nanosheet materials with large specific surface areas (graphene, silicates, boron nitride) as polymer fillers to improve the mechanical and barrier properties of PE packaging materials. In addition, traditional PE packaging films are highly flammable, pose significant safety hazards, and have poor flame retardant properties; therefore, flame retardant modification is often necessary to meet practical application requirements. Summary of the Invention

[0005] Based on a unique interlayer formulation design, this invention develops a novel eleven-layer co-extruded film made of a single PE material. This eleven-layer co-extruded film has excellent barrier properties and can be used as a packaging film for dairy products.

[0006] A process for preparing a high-barrier recyclable PE packaging film includes the following steps:

[0007] Step 1: Synthesize a flame-retardant crosslinking monomer. The chemical structural formula of this flame-retardant crosslinking monomer is as follows:

[0008]

[0009] Step 2: Modify hydroxylated graphene powder with flame-retardant crosslinking monomers to prepare modified graphene nanosheets, and then uniformly disperse the modified graphene nanosheets in an ethylene-vinyl alcohol copolymer matrix to prepare a flame-retardant barrier agent.

[0010] Step 3: An eleven-layer co-extrusion blow molding process is used to prepare a high-barrier recyclable PE packaging film with a thickness of 50-200 μm; the high-barrier recyclable PE packaging film contains the flame-retardant barrier agent from Step 2.

[0011] Preferably, the flame-retardant barrier agent contains a flame-retardant light stabilizer;

[0012] The chemical structural formula of the flame-retardant light stabilizer is:

[0013]

[0014] Preferably, the method for preparing the flame-retardant crosslinking monomer is as follows:

[0015] Step S3-1: The esterification reaction of the carboxyl functional group of [(6-oxo-6H-dibenzo[C,E][1,2]oxophosphorylhexane-6-yl)methyl]succinic acid with the hydroxyl functional group of 3-dimethylamino-1-propanol generates a DOPO-based tertiary amine monomer.

[0016] Step S3-2: Utilizing the nucleophilic substitution reaction mechanism, a flame-retardant crosslinking monomer is generated by quaternization of the tertiary amine group of the DOPO-based tertiary amine monomer with the bromine functional group of 3-bromopropyltrimethoxysilane.

[0017] Preferably, the preparation method of the flame-retardant light stabilizer is as follows:

[0018] Step S4-1: Utilizing a nucleophilic substitution reaction mechanism, the chlorine atom in sulfoxide is catalyzed by N,N-dimethylformamide to replace the hydroxyl group in the carboxyl functional group of [(6-oxo-6H-dibenzo[C,E][1,2]oxophosphorylhexane-6-yl)methyl]succinic acid, generating [(6-oxo-6H-dibenzo[C,E][1,2]oxophosphorylhexane-6-yl)methyl]succinyl chloride;

[0019] Step S4-2: An esterification reaction is carried out between the acyl chloride group of [(6-oxo-6H-dibenzo[C,E][1,2]oxophosphorylhexane-6-yl)methyl]succinyl chloride and the phenolic hydroxyl functional group of UV-0 (2,4-dihydroxybenzophenone) to generate a flame-retardant light stabilizer.

[0020] Preferably, the formulation and dosage of the high-barrier recyclable PE packaging film are as follows:

[0021] First layer: The formulation is 20-80 wt% LDPE + 20-80 wt% LLDPE, and the dosage is 5-15 wt%.

[0022] Second layer: The formulation is 20-60 wt% HDPE + 40-80 wt% m-LLDPE, and the dosage is 3-10 wt%;

[0023] The third layer: The formulation is 20-60 wt% LDPE + 40-80 wt% m-LLDPE, and the dosage is 5-15 wt%.

[0024] Fourth layer: The formula is 100wt% PE-g-MAH, and the dosage is 1-5wt%.

[0025] Fifth layer: The formula is 95-99 wt% LDPE + 1-5 wt% EVOH, and the dosage is 5-15 wt%.

[0026] The sixth layer consists of 90-99 wt% LDPE + 1-10 wt% functional barrier material, with a dosage of 10-40 wt%.

[0027] Seventh layer: The formula is 95-99 wt% LDPE + 1-5 wt% EVOH, and the dosage is 5-15 wt%.

[0028] Eighth layer: The formula is 100wt% PE-g-MAH, and the dosage is 1-5wt%.

[0029] Ninth layer: 20-60 wt% LDPE + 40-80 wt% m-LLDPE, dosage 5-15 wt%;

[0030] Tenth layer: The formula is 20-60 wt% HDPE + 40-80 wt% m-LLDPE, and the dosage is 3-10 wt%.

[0031] Eleventh layer: The formula is 20-80 wt% LDPE + 20-80 wt% LLDPE, and the dosage is 5-15 wt%.

[0032] Preferably, the hydroxylated graphene powder has a sheet diameter of 13 μm and a thickness of 15 nm.

[0033] The high-barrier recyclable PE packaging film prepared according to the above process has a water vapor transmission rate of 0.5–2.0 g / (m³). 2 ·24h)], oxygen permeability is 0.5~1.5 [cm] 3 / (m 2 ·24h·0.1MPa)).

[0034] Application of a high-barrier recyclable PE packaging film prepared according to the above process in the field of dairy product packaging.

[0035] Beneficial effects:

[0036] This invention first synthesizes a flame-retardant crosslinking monomer, uses the flame-retardant crosslinking monomer to modify the surface of inorganic raw material graphene nanosheets, and then combines it with an organic ethylene vinyl alcohol copolymer to obtain a barrier agent. The barrier agent is introduced into the raw material of PE co-extruded film, and PE packaging film is prepared by using an eleven-layer co-extrusion blow molding process.

[0037] Experimental results show that the PE packaging film prepared by this invention not only has excellent barrier properties, but also excellent light blocking and flame retardant properties. Attached Figure Description

[0038] Figure 1 The synthetic route for flame-retardant crosslinking monomers;

[0039] Figure 2 Synthetic route for flame-retardant light stabilizers;

[0040] Figure 3 The results are from performance experiments on an eleven-layer co-extruded film. Detailed Implementation

[0041] This invention uses inorganic graphene nanosheets with excellent barrier properties and organic ethylene vinyl alcohol copolymer as composite modifiers. To eliminate the agglomeration effect during the composite process of inorganic graphene nanosheets and organic ethylene vinyl alcohol copolymer, this invention designs and synthesizes a crosslinking monomer. This crosslinking monomer is used to modify the surface of the graphene nanosheets. The modified graphene nanosheets can be more uniformly dispersed when composited with ethylene vinyl alcohol copolymer, thereby achieving the technical improvement goal of synergistic barrier effect between inorganic graphene nanosheets and organic ethylene vinyl alcohol copolymer.

[0042] Experimental example:

[0043] Research and Development Experiment 1:

[0044] In order to improve the dispersion performance of graphene nanosheets and impart certain flame retardant properties to packaging materials, this invention develops and synthesizes a flame retardant crosslinking monomer.

[0045] Preparation of flame-retardant crosslinking monomers, such as Figure 1 As shown, the preparation steps are as follows:

[0046] Step 1: The DOPO-based tertiary amine monomer is generated by esterification of the carboxyl functional group of [(6-oxo-6H-dibenzo[C,E][1,2]oxophosphorylhexane-6-yl)methyl]succinic acid with the hydroxyl functional group of 3-dimethylamino-1-propanol.

[0047] Step 2: Utilizing the nucleophilic substitution reaction mechanism, a flame-retardant crosslinking monomer is generated by quaternization of the tertiary amine group of the DOPO-based tertiary amine monomer with the bromine functional group of 3-bromopropyltrimethoxysilane.

[0048] The specific experimental steps for preparing flame-retardant crosslinking monomers are as follows:

[0049] 3.5 g of [(6-oxo-6H-dibenzo[C,E][1,2]oxophosphazenecyclo-6-yl)methyl]succinic acid, 2.0 g of 3-dimethylamino-1-propanol and 60 mL of cyclohexane were added to a three-necked flask. Under mechanical stirring, 2 mL of concentrated sulfuric acid was added dropwise to the three-necked flask. The mixture was heated to 85 °C and refluxed for 4 h. The cyclohexane was recovered by vacuum distillation. The mixture was washed with saturated sodium bicarbonate aqueous solution and deionized water until neutral, filtered, and dried to obtain the DOPO-based tertiary amine monomer.

[0050] 2.6 g of DOPO-based tertiary amine monomer and 30 mL of cyclohexane were added to a three-necked flask. Under nitrogen protection and mechanical stirring, the temperature was raised to 40 °C. After the temperature stabilized, 30 mL of 3-bromopropyltrimethoxysilane solution (prepared from 2.4 g of 3-bromopropyltrimethoxysilane and 30 mL of cyclohexane) was added dropwise to the three-necked flask. The mixture was stirred at 40 °C for 12 h. After cooling, the mixture was rotary evaporated, washed with ethyl acetate, and dried under vacuum to obtain a flame-retardant crosslinking monomer.

[0051] The proton NMR spectrum characterization of the flame-retardant crosslinked monomer is as follows: 1 H NMR (CDCl3, 400MHz) δ: 0.67-0.75 (m, 4H), 1.67-1.78 (m, 4H), 2.05-2.17 (m, 4H), 2.67-2. 86 (m, 5H), 3.31 (s, 12H), 3.52-3.64 (m, 26H), 4.10-4.16 (m, 4H), 7.25-8.13 (m, 8H, Ar-H).

[0052] Research and Development Experiment 2:

[0053] In order to extend the service life of packaging materials, protect them from photoaging, and impart flame retardancy, this invention develops and synthesizes a flame retardant light stabilizer.

[0054] Preparation of flame-retardant light stabilizers, such as Figure 2 As shown, the preparation steps are as follows:

[0055] Step 1: Utilizing a nucleophilic substitution reaction mechanism, the chlorine atom in sulfoxide is catalyzed by N,N-dimethylformamide to replace the hydroxyl group in the carboxyl functional group of [(6-oxo-6H-dibenzo[C,E][1,2]oxophosphorylhexane-6-yl)methyl]succinic acid, generating [(6-oxo-6H-dibenzo[C,E][1,2]oxophosphorylhexane-6-yl)methyl]succinyl chloride;

[0056] Step 2: An esterification reaction is carried out between the acyl chloride group of [(6-oxo-6H-dibenzo[C,E][1,2]oxophosphorylhexane-6-yl)methyl]succinyl chloride and the phenolic hydroxyl functional group of UV-0 (2,4-dihydroxybenzophenone) to generate a flame-retardant light stabilizer.

[0057] The specific experimental steps for preparing flame-retardant light stabilizers are as follows:

[0058] 3.5 g of [(6-oxo-6H-dibenzo[C,E][1,2]oxophosphoric acid-6-yl)methyl]succinic acid and 50 mL of dichloromethane were added to a three-necked flask. Under mechanical stirring, 2.3 mL of thionyl chloride and 2 drops of N,N-dimethylformamide were added dropwise to the three-necked flask. The mixture was heated to 45 °C and refluxed for 6 h. After cooling to room temperature, the solvent was removed by vacuum distillation. After drying, [(6-oxo-6H-dibenzo[C,E][1,2]oxophosphoric acid-6-yl)methyl]succinyl chloride was obtained.

[0059] 1.9 g of [(6-oxo-6H-dibenzo[C,E][1,2]oxophosphazenecyclo-6-yl)methyl]succinyl chloride, 2.2 g of 2,4-dihydroxybenzophenone, and 60 mL of dichloromethane were added to a three-necked flask. Then, 2.1 mL of triethylamine was slowly added dropwise to the flask. The mixture was stirred at room temperature for 18 h. The mixture was washed successively with 1 mol / L hydrochloric acid, 5 wt% sodium bicarbonate aqueous solution, and saturated sodium chloride aqueous solution. The solvent was removed by vacuum distillation, and the mixture was dried to obtain a flame-retardant light stabilizer.

[0060] The proton NMR spectrum characterization of the flame-retardant light stabilizer is as follows: 1 H NMR (CDCl3, 400MHz) δ: 2.71-3.19 (m, 5H), 6.80-8.13 (m, 24H, Ar-H).

[0061] Example 1:

[0062] (1) Preparation of modified graphene nanosheet I. The preparation method is as follows: Graphene nanosheets (graphene nanosheets with hydroxyl groups on the surface) are modified with flame-retardant crosslinking monomers to obtain modified graphene nanosheet I. The specific experimental steps are as follows: 1g of hydroxylated graphene powder, 80mL of anhydrous ethanol and 20mL of deionized water are added to a beaker, ultrasonically treated for 10min, heated to 40℃ and then 2g of flame-retardant crosslinking monomers are added to the beaker, stirred for 10h, centrifuged, and washed repeatedly by centrifugation with anhydrous ethanol and deionized water. After vacuum drying, modified graphene nanosheet I is obtained.

[0063] The preparation method of functional barrier material I is as follows: modified graphene nanosheets I are dispersed in an ethylene-vinyl alcohol copolymer matrix to prepare functional barrier material I. The specific experimental steps are as follows: 20g of ethylene-vinyl alcohol copolymer resin and 3g of modified graphene nanosheets I are added to a twin-screw extruder, and the mixture is blended, melted, extruded and pelletized through the twin-screw extruder to prepare functional barrier material I.

[0064] (2) Preparation of modified graphene nanosheets II. The preparation method is as follows: graphene nanosheets (the surface of graphene nanosheets contains hydroxyl groups) are modified together with flame-retardant crosslinking monomers and flame-retardant light stabilizers to obtain modified graphene nanosheets II. The specific experimental steps are the same as those of the preparation experiment of modified graphene nanosheets I. The only difference is that 1g of flame-retardant crosslinking monomers and 1g of flame-retardant light stabilizers are used to replace 2g of flame-retardant crosslinking monomers.

[0065] The preparation method of functional barrier material II is as follows: modified graphene nanosheets II are dispersed in an ethylene-vinyl alcohol copolymer matrix to prepare functional barrier material II. The specific experimental steps are the same as those of the preparation experiment of functional barrier material I. The only difference is that modified graphene nanosheets I are replaced by modified graphene nanosheets II.

[0066] (3) Preparation of blended barrier material: The preparation method is as follows: graphene nanosheets are directly dispersed in ethylene-vinyl alcohol copolymer matrix to prepare blended barrier material. The specific experimental steps are the same as the preparation experiment of functional barrier material I. The only difference is that graphene nanosheets are used to replace modified graphene nanosheets I.

[0067] Among them, the ethylene-vinyl alcohol copolymer resin (EVOH) was purchased from Guangzhou Best New Material Technology Co., Ltd., and its grade is ET3803RB; the hydroxylated graphene powder was purchased from Sichuan Kenye Technology Development Co., Ltd., and its specifications are: average sheet diameter of 2μm and average thickness of 3nm.

[0068] Example 2:

[0069] (1) Preparation of eleven-layer co-extruded film I, including the following steps:

[0070] Step 1: Set the eleven-layer co-extruded membrane I as an eleven-layer symmetrical membrane structure. The formulation and dosage of each membrane layer are as follows:

[0071] First layer: The formula is 50wt% LDPE + 50wt% LLDPE, and the amount used is 10wt%;

[0072] Second layer: The formula is 40wt% HDPE + 60wt% m-LLDPE, and the dosage is 5wt%;

[0073] The third layer: The formulation is 40wt% LDPE + 60wt% m-LLDPE, and the dosage is 10wt%;

[0074] Fourth layer: The formula is 100wt% PE-g-MAH, and the dosage is 2.5wt%;

[0075] Fifth layer: The formula is 98wt% LDPE + 2wt% EVOH, and the dosage is 10wt%.

[0076] Sixth layer: The formula is 95wt% LDPE + 5wt% functional barrier material I, with a dosage of 25wt%;

[0077] Seventh layer: The formula is 98wt% LDPE + 2wt% EVOH, and the dosage is 10wt%.

[0078] Eighth layer: The formula is 100wt% PE-g-MAH, and the dosage is 2.5wt%;

[0079] Ninth layer: 40wt% LDPE + 60wt% m-LLDPE, 10wt% in amount;

[0080] Tenth layer: The formula is 40wt% HDPE + 60wt% m-LLDPE, and the dosage is 5wt%.

[0081] Eleventh layer: The formula is 50wt% LDPE + 50wt% LLDPE, and the dosage is 10wt%.

[0082] Step 2: The raw materials from Step 1 are fed into the hoppers of the eleven screw extruders of the eleven-layer co-extrusion film blow molding unit. After mixing, the molten resin is collected at the die head through the distributor, extruded through the die head, blow molded, cooled, and wound up to obtain an eleven-layer co-extrusion film I with a thickness of 100μm.

[0083] The process parameters for the screw extruders corresponding to the first, second, third, ninth, tenth, and eleventh layers are set as follows: the temperatures of zones 1-3 are 120℃, 150℃, and 170℃, respectively; the runner temperature is 165℃; and the rotation speed is 30r / min.

[0084] The process parameters for the screw extruders corresponding to the fourth and eighth layers are set as follows: the temperatures of zones 1-3 are 125℃, 150℃, and 165℃, respectively; the runner temperature is 160℃; and the rotation speed is 15r / min.

[0085] The process parameters for the screw extruders corresponding to the fifth, sixth, and seventh layers are set as follows: the temperatures of zones 1-3 are 140℃, 160℃, and 180℃, respectively; the runner temperature is 175℃; and the rotation speed is 40r / min.

[0086] Among them, low-density polyethylene resin (LDPE) was purchased from Jiangsu Rantai Plastics Co., Ltd., with the grade LD 150DW; linear low-density polyethylene resin (LLDPE) was purchased from Yuyao Hongyang Plastics Co., Ltd., with the grade 2045G; high-density polyethylene resin (HDPE) was purchased from Dongguan Longhuang Plastic Raw Materials Co., Ltd., with the grade FB5600; metallocene polyethylene resin (m-LLDPE) was purchased from Dongguan Jinshixiang Plastic Raw Materials Co., Ltd., with the grade SP4020; and maleic anhydride grafted polyethylene resin (PE-g-MAH) was purchased from Dongguan Taotao Plastic Raw Materials Co., Ltd., with the grade 4288.

[0087] (2) Preparation of eleven-layer co-extruded film II: Only functional barrier material II is used to replace functional barrier material I in eleven-layer co-extruded film I, and the rest are the same as eleven-layer co-extruded film I, to prepare eleven-layer co-extruded film II.

[0088] (3) Preparation of eleven-layer co-extruded film a: Only the blended barrier material is used to replace the functional barrier material I in the eleven-layer co-extruded film I, and the rest are the same as the eleven-layer co-extruded film I. The eleven-layer co-extruded film is prepared and used as comparative example 1.

[0089] (4) Preparation of eleven-layer co-extruded film b: Only EVOH resin was used to replace the functional barrier material I in eleven-layer co-extruded film I, and the rest were the same as eleven-layer co-extruded film I. Eleven-layer co-extruded film b was prepared and used as comparative example 2.

[0090] Performance testing:

[0091] (1) Barrier performance: The barrier performance of the samples was tested using a Y110 oxygen transmission rate tester and a TC-03 water vapor transmission rate tester in accordance with GB / T 1038-2000 and GB / T 1037-2021, respectively.

[0092] (2) Flame retardant performance: A rectangular sample of 2cm×4cm was fixed vertically and burned, and the ignition time of the sample was recorded.

[0093] (3) Light blocking performance: The transmittance of the sample was tested using a Lambda 950 UV-Vis spectrophotometer in accordance with GB / T2410-2008. The test wavelength range was 250-800nm, and the transmittance of the sample at 380nm was recorded.

[0094] (4) Mechanical properties: The 30mm×5mm sample was fixed on the Instron 5565 universal tensile testing machine and tensile test was performed at a tensile rate of 5mm / min. The longitudinal and transverse tensile strengths were recorded respectively.

[0095] The experimental results are shown in Table 1 below. Figure 3 .

[0096] Table 1. Performance test results of the eleven-layer co-extruded film

[0097]

[0098]

[0099] A comprehensive analysis of the above experimental results leads to the following conclusions:

[0100] (1) The barrier agent obtained by first modifying graphene nanosheets with flame-retardant crosslinking monomers and then compounding them with ethylene vinyl alcohol copolymer has a significantly better effect on improving the barrier performance of packaging materials than the barrier agent obtained by direct physical blending.

[0101] (2) This invention not only endows the packaging material with excellent light blocking and flame retardant capabilities, but also improves the overall mechanical properties of the material.

Claims

1. A process for preparing a high-barrier recyclable PE packaging film, characterized in that, Includes the following steps: Step 1: Synthesize a flame-retardant crosslinking monomer. The chemical structural formula of this flame-retardant crosslinking monomer is as follows: Step 2: Modify hydroxylated graphene powder with flame-retardant crosslinking monomers to prepare modified graphene nanosheets, and then uniformly disperse the modified graphene nanosheets in an ethylene-vinyl alcohol copolymer matrix to prepare a flame-retardant barrier agent. Step 3: An eleven-layer co-extrusion blow molding process is used to prepare a high-barrier recyclable PE packaging film with a thickness of 50-200 μm; the high-barrier recyclable PE packaging film contains the flame-retardant barrier agent from Step 2.

2. The preparation process of a high-barrier recyclable PE packaging film according to claim 1, characterized in that, The flame-retardant barrier contains a flame-retardant light stabilizer; The chemical structural formula of the flame-retardant light stabilizer is:

3. The preparation process of a high-barrier recyclable PE packaging film according to claim 1, characterized in that, The preparation method of the flame-retardant crosslinked monomer is as follows: Step S3-1: The esterification reaction of the carboxyl functional group of [(6-oxo-6H-dibenzo[C,E][1,2]oxophosphorylhexane-6-yl)methyl]succinic acid with the hydroxyl functional group of 3-dimethylamino-1-propanol generates a DOPO-based tertiary amine monomer. Step S3-2: Utilizing the nucleophilic substitution reaction mechanism, a flame-retardant crosslinking monomer is generated by quaternization of the tertiary amine group of the DOPO-based tertiary amine monomer with the bromine functional group of 3-bromopropyltrimethoxysilane.

4. The preparation process of a high-barrier recyclable PE packaging film according to claim 2, characterized in that, The preparation method of the flame-retardant light stabilizer is as follows: Step S4-1: Utilizing a nucleophilic substitution reaction mechanism, the chlorine atom in sulfoxide is catalyzed by N,N-dimethylformamide to replace the hydroxyl group in the carboxyl functional group of [(6-oxo-6H-dibenzo[C,E][1,2]oxophosphorylhexane-6-yl)methyl]succinic acid, generating [(6-oxo-6H-dibenzo[C,E][1,2]oxophosphorylhexane-6-yl)methyl]succinyl chloride; Step S4-2: An esterification reaction is carried out between the acyl chloride group of [(6-oxo-6H-dibenzo[C,E][1,2]oxophosphorylhexane-6-yl)methyl]succinyl chloride and the phenolic hydroxyl functional group of UV-0 (2,4-dihydroxybenzophenone) to generate a flame-retardant light stabilizer.

5. The preparation process of a high-barrier recyclable PE packaging film according to claim 1, characterized in that, The formulation and dosage of the high-barrier recyclable PE packaging film are as follows: First layer: The formulation is 20-80 wt% LDPE + 20-80 wt% LLDPE, and the dosage is 5-15 wt%. Second layer: The formulation is 20-60 wt% HDPE + 40-80 wt% m-LLDPE, and the dosage is 3-10 wt%; The third layer: The formulation is 20-60 wt% LDPE + 40-80 wt% m-LLDPE, and the dosage is 5-15 wt%. Fourth layer: The formula is 100wt% PE-g-MAH, and the dosage is 1-5wt%. Fifth layer: The formula is 95-99 wt% LDPE + 1-5 wt% EVOH, and the dosage is 5-15 wt%. The sixth layer consists of 90-99 wt% LDPE + 1-10 wt% functional barrier material, with a dosage of 10-40 wt%. Seventh layer: The formula is 95-99 wt% LDPE + 1-5 wt% EVOH, and the dosage is 5-15 wt%. Eighth layer: The formula is 100wt% PE-g-MAH, and the dosage is 1-5wt%. Ninth layer: 20-60 wt% LDPE + 40-80 wt% m-LLDPE, dosage 5-15 wt%; Tenth layer: The formula is 20-60 wt% HDPE + 40-80 wt% m-LLDPE, and the dosage is 3-10 wt%. Eleventh layer: The formula is 20-80 wt% LDPE + 20-80 wt% LLDPE, and the dosage is 5-15 wt%.

6. The preparation process of a high-barrier recyclable PE packaging film according to claim 1, characterized in that, The hydroxylated graphene powder has a sheet diameter of 13 μm and a thickness of 15 nm.

7. A high-barrier recyclable PE packaging film prepared according to any one of claims 1-6, characterized in that, The water vapor transmission rate of the high-barrier recyclable PE packaging film is 0.5–2.0 g / (m³). 2 ·24h)], oxygen permeability is 0.5~1.5 [cm] 3 / (m 2 ·24h·0.1MPa)).

8. The application of a high-barrier recyclable PE packaging film according to claim 7 in the field of dairy product packaging.

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