Graphene facial mask antibacterial packaging bag and preparation method thereof

Abstract

This invention relates to the field of packaging technology, specifically disclosing a graphene facial mask antibacterial packaging bag and its preparation method. The graphene facial mask antibacterial packaging bag is a five-layer co-extruded composite film, consisting of an antibacterial inner layer, a reinforcing inner layer, a barrier middle layer, a reinforcing outer layer, and a protective outer layer, arranged sequentially from the inside out. The antibacterial inner layer is a blend of low-density polyethylene, nano-graphene, bentonite, zinc tetradecanoate, and polyglycerol ricinoleate in a weight ratio of (90~92):(1~5):(1~2):(2~3):(0.5~0.8). This graphene facial mask antibacterial packaging bag is prepared using five-layer co-extruded composite film technology. This application significantly improves the barrier and antibacterial properties of the graphene facial mask antibacterial packaging bag.

Description

Technical Field

[0001] This invention relates to the field of packaging technology, and in particular to a graphene antibacterial packaging bag and its preparation method. Background Technology

[0002] With the improvement of living standards, the use of face masks has become increasingly common. Face masks contain rich nutrient solutions, which can act as natural culture media for bacterial growth. If bacterial growth in the mask cannot be effectively inhibited, it can easily lead to spoilage, seriously affecting sales and usability. Therefore, effectively inhibiting bacterial growth in face masks throughout their long shelf life has always been a key issue in mask production. Commercially available face masks often use preservatives to inhibit bacterial growth; however, preservatives can irritate the skin, and some people with sensitive skin may experience allergic reactions after using these masks.

[0003] To reduce the amount of preservatives added to face masks, some manufacturers choose to use antibacterial film sheets and antibacterial packaging bags during the mask production process. The combined antibacterial effect of these materials effectively reduces the amount of preservatives added while maintaining a longer shelf life. Currently, antibacterial packaging bags on the market are generally made by adding antibacterial substances. Graphene, a common antibacterial substance, can significantly improve the antibacterial properties of polyethylene film when added to it. However, in actual production, it has been found that the strong stacking of conjugated six-membered rings in graphene makes it difficult for it to achieve good dispersion in the polyethylene matrix. Therefore, while directly adding graphene to the polyethylene matrix may produce a polyethylene film with some antibacterial properties, the uneven dispersion of graphene can lead to localized aggregation and agglomeration. This can potentially reduce the mechanical properties and barrier properties of the polyethylene film, severely impacting the quality of the antibacterial packaging bags made from it. Therefore, it is necessary to improve the dispersibility of graphene in polyethylene matrix. Summary of the Invention

[0004] To improve the dispersibility of graphene in a polyethylene matrix, this application provides an antibacterial packaging bag for graphene facial masks and a method for preparing the same. The antibacterial packaging bag for graphene facial masks prepared in this application exhibits good antibacterial and barrier properties, and using this antibacterial packaging bag can effectively extend the shelf life of the facial mask.

[0005] Firstly, the antibacterial packaging bag for graphene facial masks provided in this application adopts the following technical solution:

[0006] A graphene facial mask antibacterial packaging bag, wherein the graphene facial mask antibacterial packaging bag is a five-layer co-extruded composite film, which is arranged from the inside to the outside as an antibacterial inner layer, a reinforcing inner layer, a barrier middle layer, a reinforcing outer layer, and a protective outer layer;

[0007] The antibacterial inner layer is made by blending low-density polyethylene, nano-graphene, bentonite, zinc tetradecanoate, and polyglycerol ricinoleate in a weight ratio of (90-92):(1-5):(1-2):(2-3):(0.5-0.8).

[0008] In the above technical solution, the antibacterial inner layer prepared by blending low-density polyethylene, nano-graphene, bentonite, zinc tetradecanoate, and polyglycerol ricinoleate possesses excellent antibacterial and barrier properties. Nano-graphene exhibits good antibacterial properties, and through the synergistic effect of zinc tetradecanoate and polyglycerol ricinoleate, it is uniformly dispersed in the low-density polyethylene matrix, significantly enhancing the antibacterial performance of the inner layer. Nano-graphene and bentonite can act as nucleation points during the crystallization process of low-density polyethylene, further promoting the ordered crystallization of the polyethylene. Zinc tetradecanoate and polyglycerol ricinoleate promote the formation of small and uniform grains during the crystallization process of low-density polyethylene, thereby further extending the penetration and diffusion paths of gas and water molecules, further blocking the penetration of gas and water molecules, and further enhancing the barrier performance of the antibacterial inner layer.

[0009] Preferably, the graphene is modified graphene, which refers to the modified graphene obtained by immersing nano-graphene in a mixed solution of ethanol, thymol and phenyl o-hydroxybenzoate in a weight ratio of 20:(1-2):(3-5) for 5-8 minutes, filtering and drying. The volume ratio of the nano-graphene to the mixed solution is 1:(5-10).

[0010] In the above technical solution, this application further improves the antibacterial properties of nano-graphene by attaching thymol and phenyl o-hydroxybenzoate to nano-graphene. At the same time, thymol and phenyl o-hydroxybenzoate can further inhibit the further development of crystals with nano-graphene as the crystal nucleus, thereby achieving the effect of further enhancing the antibacterial and barrier properties of the antibacterial inner layer.

[0011] Preferably, the raw material used for the inner and outer reinforcing layers is maleic anhydride-grafted low-density polyethylene resin.

[0012] In the above technical solution, maleic anhydride-grafted low-density polyethylene resin is a resin with high chemical activity. Using it in the inner and outer reinforcing layers can enhance the adhesion between the various layers of the graphene antibacterial packaging bag, and further improve the impact resistance and thermal stability of the graphene antibacterial packaging bag.

[0013] Preferably, the barrier interlayer is a blend of polypropylene, ethylene-vinyl alcohol copolymer resin and nylon in a weight ratio of (60-70):(20-30):(5-10).

[0014] In the above technical solution, the barrier interlayer of this application is made by blending polypropylene, ethylene-vinyl alcohol copolymer resin and nylon, which further improves the mechanical strength and barrier performance of the barrier interlayer. It can not only effectively block harmful substances such as gases, water molecules and odors, but also endow the graphene mask antibacterial packaging bag with soft and bend-resistant properties.

[0015] Preferably, the protective outer layer is made by blending low-density polyethylene resin and linear low-density polyethylene resin in a weight ratio of (60-70):(30-40).

[0016] In the above technical solution, the protective outer layer of this application is made of a blend of low-density polyethylene resin and linear low-density polyethylene resin. The low-density polyethylene resin has good flexibility, electrical insulation, and moisture resistance, while the linear low-density polyethylene resin has good impact resistance, wear resistance, and aging resistance. This application prepares the protective outer layer by blending the two in a certain proportion, which can further enhance the mechanical properties and barrier properties of the graphene film antibacterial packaging bag.

[0017] Preferably, the thickness ratio of the antibacterial inner layer, the reinforcing inner layer, the barrier middle layer, the reinforcing outer layer, and the protective outer layer is 1:(0.4-0.5):(1.5-2):(0.4-0.5):(0.8-1).

[0018] In the above technical solution, this application, through the design of this thickness ratio, can maximize the preservation of the functions of each layer of material while promoting the cooperation of each layer structure to form a synergistic whole, further improving the antibacterial and barrier properties of graphene mask antibacterial packaging bags.

[0019] Secondly, the preparation method of the graphene facial mask antibacterial packaging bag provided in this application adopts the following technical solution:

[0020] A method for preparing an antibacterial packaging bag for graphene facial masks includes the following steps:

[0021] Step 1: According to the raw material ratio designed for the five-layer structure of graphene antibacterial packaging bags, put the raw material components with different mass ratios into the corresponding barrels of the extruder, stir and mix evenly to obtain the antibacterial inner layer melt, the reinforced middle inner layer melt, the barrier middle layer melt, the reinforced middle outer layer melt, and the protective outer layer melt.

[0022] Step 2: Extrude the melt layers obtained in Step 1 simultaneously, and after extrusion, inflate them through a mold to obtain the graphene mask antibacterial packaging bag.

[0023] Preferably, in step 1, the barrel temperature for feeding the antibacterial inner layer material is 110-120°C, the barrel temperature for feeding the reinforcing inner layer material is 150-160°C, the barrel temperature for feeding the barrier middle layer material is 200-210°C, the barrel temperature for feeding the reinforcing outer layer material is 150-160°C, and the barrel temperature for feeding the protective outer layer material is 150-160°C.

[0024] Preferably, in step 2, the extrusion speed of the antibacterial inner layer melt is 0.8–1.0 m / s, the extrusion speed of the reinforcing inner layer melt is 0.4–0.6 m / s, the extrusion speed of the barrier intermediate layer melt is 1.2–1.4 m / s, the extrusion speed of the reinforcing outer layer melt is 0.4–0.6 m / s, and the extrusion speed of the protective outer layer melt is 0.8–1.0 m / s.

[0025] In the above technical solution and preparation method, this application mixes the raw materials evenly in proportion, and then extrudes the melt of each layer simultaneously to prepare the graphene mask antibacterial packaging bag, which effectively improves the adhesion between the layers and the flatness of the film, further improves the antibacterial and barrier properties of the graphene mask antibacterial packaging bag, and further improves the quality and user experience of the graphene mask antibacterial packaging bag.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. In this application, nano-graphene possesses excellent antibacterial properties. At the same time, nano-graphene and bentonite can promote the orderly crystallization of low-density polyethylene, while zinc tetradecanoate and polyglycerol ricinoleate can improve the dispersibility of nano-graphene and bentonite in low-density polyethylene and promote the formation of small and uniform grains in low-density polyethylene during the crystallization process. The synergistic effect of nano-graphene, bentonite, zinc tetradecanoate and polyglycerol ricinoleate significantly enhances the barrier and antibacterial properties of the antibacterial inner layer.

[0028] 2. This application further enhances the antibacterial properties of graphene nanoparticles by immobilizing thymol and phenyl o-hydroxybenzoate on them. Simultaneously, thymol and phenyl o-hydroxybenzoate effectively inhibit the further growth of graphene nanoparticles as nuclei, thereby further strengthening the antibacterial and barrier properties of the antibacterial inner layer. Detailed Implementation

[0029] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0030] Preparation Example 1

[0031] A modified graphene, prepared by the following method:

[0032] The modified graphene was obtained by immersing the nano-graphene in a mixed solution of ethanol, thymol and phenyl o-hydroxybenzoate in a weight ratio of 20:1:5 for 5 minutes, filtering, and drying at 50°C.

[0033] The volume ratio of the nano-graphene to the mixed solution is 1:5.

[0034] The nano-graphene was purchased from Shanghai Yingfeng Ruihuang Metal Materials Co., Ltd., grade: 592, with a particle size between 50 and 80 nm.

[0035] Preparation Example 2

[0036] A modified graphene, different from preparation example 1, is prepared by the following method:

[0037] The modified graphene was obtained by immersing the nano-graphene in a mixed solution of ethanol, thymol and phenyl o-hydroxybenzoate in a weight ratio of 20:2:3 for 8 minutes, filtering, and drying at 40°C.

[0038] The volume ratio of the nano-graphene to the mixed solution is 1:10.

[0039] The nano-graphene was purchased from Shanghai Yingfeng Ruihuang Metal Materials Co., Ltd., grade: 592, with a particle size between 50 and 80 nm.

[0040] Preparation Example 3

[0041] A modified graphene, unlike Preparation Example 1, does not contain thymol.

[0042] Preparation Example 4

[0043] A modified graphene, unlike Preparation Example 1, does not contain phenyl phthalate.

[0044] Example 1

[0045] A graphene facial mask antibacterial packaging bag is configured from the inside out as follows: an antibacterial inner layer, a reinforced inner middle layer, a barrier middle layer, a reinforced outer middle layer, and a protective outer layer.

[0046] The antibacterial inner layer is a blend of low-density polyethylene, nano-graphene, bentonite, zinc tetradecanoate, and polyglycerol ricinoleate in a weight ratio of 90:1:1:2:0.5.

[0047] The inner layer of the reinforcement is made of maleic anhydride-grafted low-density polyethylene resin.

[0048] The barrier interlayer is composed of polypropylene, ethylene-vinyl alcohol copolymer resin and nylon in a weight ratio of 60:30:10.

[0049] The outer layer of the reinforcement is made of maleic anhydride-grafted low-density polyethylene resin.

[0050] The outer protective layer is made of a blend of low-density polyethylene resin and linear low-density polyethylene resin in a weight ratio of 60:40.

[0051] The low-density polyethylene was purchased from Shanghai Tingyuan Plastics Technology Co., Ltd., under the brand name Iran Petrochemical, model number 2102TX00.

[0052] The bentonite was purchased from Zhejiang Fenghong New Material Co., Ltd., and its particle size is between 40 and 60 nm.

[0053] Zinc tetradecanoate was purchased from Yantai Zhaoyi Biotechnology Co., Ltd.

[0054] The polyglycerol ricinoleate was purchased from Wuhan Kemic Biomedical Technology Co., Ltd.

[0055] The maleic anhydride-grafted low-density polyethylene resin is from Mitsui Chemicals, and its brand name is LLD polyethylene GT6.

[0056] The nylon used is Nylon 6, sourced from DuPont in the United States, with the brand name ST7301 NC010.

[0057] The polypropylene used is from Sinopec, and its grade is PP N-T30S.

[0058] The ethylene-vinyl alcohol copolymer resin is from Kuraray, Japan, brand name: L104A.

[0059] The linear low-density polyethylene resin was purchased from Hubei Xinyuhong Biomedical Technology Co., Ltd., model: LLD polyethylene DFDA-7042.

[0060] The preparation method of the antibacterial packaging bag for graphene facial masks includes the following steps:

[0061] Step 1: According to the raw material ratio designed for the five-layer structure of the graphene antibacterial packaging bag, the raw material components with different mass ratios are respectively added to the corresponding barrels of the extruder. The barrel temperature for adding the antibacterial inner layer raw material is 110℃, the barrel temperature for adding the reinforcing inner layer raw material is 150℃, the barrel temperature for adding the barrier middle layer raw material is 200℃, the barrel temperature for adding the reinforcing outer layer raw material is 150℃, and the barrel temperature for adding the protective outer layer raw material is 150℃. After stirring and mixing evenly, the antibacterial inner layer melt, the reinforcing inner layer melt, the barrier middle layer melt, the reinforcing outer layer melt, and the protective outer layer melt are obtained respectively.

[0062] Step 2: Simultaneously extrude the melt layers obtained in Step 1. The extrusion speeds are as follows: the antibacterial inner layer melt is 0.8 m / s, the reinforcing inner layer melt is 0.4 m / s, the barrier middle layer melt is 1.2 m / s, the reinforcing outer layer melt is 0.4 m / s, and the protective outer layer melt is 0.8 m / s. After extrusion, the melt is inflated through a die at a blow-up ratio of 1:3.0 to obtain the graphene antibacterial mask packaging bag.

[0063] In this embodiment, the thickness of the antibacterial packaging bag for the graphene mask is 46 μm. The thickness of the antibacterial inner layer is 10 μm, the thickness of the reinforcing inner layer is 4 μm, the thickness of the barrier middle layer is 20 μm, the thickness of the reinforcing outer layer is 4 μm, and the thickness of the protective outer layer is 8 μm.

[0064] Example 2

[0065] A graphene facial mask antibacterial packaging bag, which differs from Example 1 in that it is configured from the inside out as an antibacterial inner layer, a reinforced inner layer, a barrier middle layer, a reinforced outer layer, and a protective outer layer.

[0066] The antibacterial inner layer is a blend of low-density polyethylene, nano-graphene, bentonite, zinc tetradecanoate, and polyglycerol ricinoleate in a weight ratio of 92:5:2:3:0.8.

[0067] The barrier interlayer is composed of polypropylene, ethylene-vinyl alcohol copolymer resin and nylon in a weight ratio of 70:20:5.

[0068] The outer protective layer is made of a blend of low-density polyethylene resin and linear low-density polyethylene resin in a weight ratio of 70:30.

[0069] The preparation method of the antibacterial packaging bag for graphene facial masks includes the following steps:

[0070] Step 1: According to the raw material ratio designed for the five-layer structure of the graphene antibacterial packaging bag, the raw material components with different mass ratios are respectively added to the corresponding barrels of the extruder. The barrel temperature for adding the antibacterial inner layer raw material is 120℃, the barrel temperature for adding the reinforcing inner layer raw material is 160℃, the barrel temperature for adding the barrier middle layer raw material is 210℃, the barrel temperature for adding the reinforcing outer layer raw material is 160℃, and the barrel temperature for adding the protective outer layer raw material is 160℃. After stirring and mixing evenly, the antibacterial inner layer melt, the reinforcing inner layer melt, the barrier middle layer melt, the reinforcing outer layer melt, and the protective outer layer melt are obtained respectively.

[0071] Step 2: Simultaneously extrude the melt layers obtained in Step 1. The extrusion speeds are as follows: the antibacterial inner layer melt is 1.0 m / s, the reinforcing inner layer melt is 0.6 m / s, the barrier middle layer melt is 1.4 m / s, the reinforcing outer layer melt is 0.6 m / s, and the protective outer layer melt is 1.0 m / s. After extrusion, the melt is inflated through a die at a blow-up ratio of 1:2.5 to obtain the graphene antibacterial mask packaging bag.

[0072] In this embodiment, the thickness of the antibacterial packaging bag for the graphene mask is 45 μm. The thickness of the antibacterial inner layer is 10 μm, the thickness of the reinforcing inner layer is 5 μm, the thickness of the barrier middle layer is 15 μm, the thickness of the reinforcing outer layer is 5 μm, and the thickness of the protective outer layer is 10 μm.

[0073] Example 3

[0074] A graphene facial mask antibacterial packaging bag, which differs from Example 1 in that it is configured from the inside out as an antibacterial inner layer, a reinforced inner layer, a barrier middle layer, a reinforced outer layer, and a protective outer layer.

[0075] The antibacterial inner layer is made of low-density polyethylene, nano-graphene, bentonite, zinc tetradecanoate, and polyglycerol ricinoleate in a weight ratio of 91:3.5:1.5:2.5:0.6.

[0076] The barrier interlayer is composed of polypropylene, ethylene-vinyl alcohol copolymer resin and nylon in a weight ratio of 65:25:10.

[0077] The outer protective layer is made of a blend of low-density polyethylene resin and linear low-density polyethylene resin in a weight ratio of 65:35.

[0078] Example 4

[0079] An antibacterial packaging bag for a graphene face mask, which differs from Example 1 in that the nano-graphene is derived from Preparation Example 1.

[0080] Example 5

[0081] An antibacterial packaging bag for a graphene face mask, which differs from Example 1 in that the nano-graphene is derived from Preparation Example 2.

[0082] Example 6

[0083] An antibacterial packaging bag for a graphene face mask, which differs from Example 1 in that the nano-graphene is derived from Preparation Example 3.

[0084] Example 7

[0085] An antibacterial packaging bag for a graphene face mask, which differs from Example 1 in that the nano-graphene is derived from Preparation Example 4.

[0086] Comparative Example 1

[0087] An antibacterial packaging bag for graphene face masks, which differs from Example 1 in that it does not contain bentonite.

[0088] Comparative Example 2

[0089] An antibacterial packaging bag for graphene face masks, which differs from Example 1 in that it does not contain zinc tetradecanoate.

[0090] Comparative Example 3

[0091] An antibacterial packaging bag for graphene face masks, which differs from Example 1 in that it does not contain polyglycerol ricinoleate.

[0092] Experimental Example

[0093] The antibacterial properties of graphene facial film antibacterial packaging bags were tested in accordance with GB / T 31402-2015 "Plastics and Plastic Surfaces Antibacterial Properties Test Method".

[0094] The water vapor transmission rate (g / (m)) of the antibacterial packaging bag for graphene facial masks was tested according to GB / T1037-1988, "Test Method for Water Vapor Permeability of Plastic Films and Sheets - Cup Method". 2 .24h).

[0095] The oxygen permeability (cm²) of the antibacterial packaging bag for graphene face masks was tested according to ASTM D3985-1995, "Test method for oxygen permeability through plastic films and sheets using a charge sensor". 3 / (m 2 0.24h.0.1MPa).

[0096] The test results are shown in Table 1.

[0097] Table 1:

[0098]

[0099]

[0100] Based on the analysis of Examples 1-7, Comparative Examples 1-3 and Table 1, it is easy to see that Examples 1-7 have good antibacterial and barrier properties.

[0101] Specifically, based on the analysis of Example 1 and Comparative Examples 1-3, the difference between Comparative Examples 1-3 and Example 1 lies in the absence of bentonite, zinc tetradecanoate, and polyglycerol ricinoleate. The barrier and antibacterial properties of Example 1 are superior to those of Comparative Examples 1-3 to a certain extent. This shows that zinc tetradecanoate and polyglycerol ricinoleate can promote the uniform distribution of nano-graphene in the antibacterial inner layer, thereby improving the antibacterial effect of the antibacterial inner layer. Furthermore, the synergistic effect of nano-graphene, bentonite, zinc tetradecanoate, and polyglycerol ricinoleate can significantly enhance the barrier properties of the antibacterial inner layer.

[0102] Specifically, based on the analysis of Examples 1 and 4-7, Examples 4-7 used modified graphene, while Examples 4-5 used modified graphene with the addition of both thymol and phenyl o-hydroxybenzoate. The modified graphene in Examples 6-7 did not have the addition of both thymol and phenyl o-hydroxybenzoate. The barrier and antibacterial properties of Examples 4-5 were superior to those of Examples 1 and 6-7. Therefore, it can be seen that further fixing thymol and phenyl o-hydroxybenzoate onto nano-graphene can not only further improve the antibacterial properties of nano-graphene, but also effectively inhibit the further growth of nano-graphene as crystal nuclei, thereby further enhancing the antibacterial and barrier properties of the antibacterial inner layer.

[0103] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A graphene facial mask antibacterial packaging bag, characterized in that, The graphene mask antibacterial packaging bag is a five-layer co-extruded composite film, which is arranged from the inside out as an antibacterial inner layer, a reinforcing inner layer, a barrier middle layer, a reinforcing outer layer, and a protective outer layer. The antibacterial inner layer is composed of low-density polyethylene, nano-graphene, bentonite, zinc tetradecanoate, and polyglycerol ricinoleate in a weight ratio of (90~92):(1~5):(1~2):(2~3):(0.5~0.8). The graphene is modified graphene, which is obtained by immersing nano-graphene in a mixed solution of ethanol, thymol and phenyl o-hydroxybenzoate in a weight ratio of 20:(1~2):(3~5) for 5~8 minutes, filtering and drying. The volume ratio of the nano-graphene to the mixed solution is 1:(5~10).

2. The graphene facial mask antibacterial packaging bag according to claim 1, characterized in that, The inner and outer reinforcing layers are made from maleic anhydride-grafted low-density polyethylene resin.

3. The graphene facial mask antibacterial packaging bag according to claim 1, characterized in that, The barrier interlayer is made of polypropylene, ethylene-vinyl alcohol copolymer resin and nylon in a weight ratio of (60~70):(20~30):(5~10).

4. The graphene facial mask antibacterial packaging bag according to claim 1, characterized in that, The protective outer layer is made by blending low-density polyethylene resin and linear low-density polyethylene resin in a weight ratio of (60~70):(30~40).

5. A graphene facial mask antibacterial packaging bag according to any one of claims 1 to 4, characterized in that, The thickness ratio of the antibacterial inner layer, the reinforced inner layer, the barrier middle layer, the reinforced outer layer, and the protective outer layer is 1:(0.4~0.5):(1.5~2):(0.4~0.5):(0.8~1).

6. A method for preparing an antibacterial packaging bag for a graphene facial mask as described in any one of claims 1 to 5, characterized in that, Includes the following steps: Step 1: According to the raw material ratio designed for the five-layer structure of graphene antibacterial packaging bags, put the raw material components with different mass ratios into the corresponding barrels of the extruder, stir and mix evenly to obtain the antibacterial inner layer melt, the reinforced middle inner layer melt, the barrier middle layer melt, the reinforced middle outer layer melt, and the protective outer layer melt. Step 2: Extrude the melt layers obtained in Step 1 simultaneously, and after extrusion, inflate them through a mold to obtain the graphene mask antibacterial packaging bag.

7. The method for preparing a graphene facial mask antibacterial packaging bag according to claim 6, characterized in that, In step 1, the barrel temperature for adding the antibacterial inner layer material is 110~120℃, the barrel temperature for adding the reinforcing inner layer material is 150~160℃, the barrel temperature for adding the barrier middle layer material is 200~210℃, the barrel temperature for adding the reinforcing outer layer material is 150~160℃, and the barrel temperature for adding the protective outer layer material is 150~160℃.

8. The method for preparing a graphene facial mask antibacterial packaging bag according to claim 6, characterized in that, In step 2, the extrusion speed of the antibacterial inner layer melt is 0.8~1.0 m / s, the extrusion speed of the reinforcing inner layer melt is 0.4~0.6 m / s, the extrusion speed of the barrier intermediate layer melt is 1.2~1.4 m / s, the extrusion speed of the reinforcing outer layer melt is 0.4~0.6 m / s, and the extrusion speed of the protective outer layer melt is 0.8~1.0 m / s.

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