A puncture-resistant multilayer co-extruded pe film and a method for its production

Abstract

This application belongs to the field of multilayer co-extruded PE film technology, specifically providing a puncture-resistant multilayer co-extruded PE film and its preparation method. The puncture-resistant multilayer co-extruded PE film of this application comprises, from top to bottom, a surface PE layer, an adhesive layer, a core PE layer, an adhesive layer, a modified acrylic resin functional layer, an adhesive layer, and a surface PE layer. The modified acrylic resin functional layer is a blend of a quaternary copolymer of acrylic acid, methyl methacrylate, butyl acrylate, and octadecyl acrylate with low-density polyethylene, containing long-chain alkyl groups. During the melting process, it can embed into the amorphous regions of polyethylene, forming a microscopic interpenetrating network, improving interfacial strength. Furthermore, the functional layer has high toughness; when punctured by a sharp object, it can undergo large deformation, absorb energy, and inhibit crack propagation. Therefore, the multilayer co-extruded PE film of this application has excellent mechanical properties and puncture resistance.

Description

Technical Field

[0001] This application belongs to the field of multilayer co-extruded PE film technology, and in particular relates to a puncture-resistant multilayer co-extruded PE film and its preparation method. Background Technology

[0002] Polyethylene (PE) film is widely used in packaging, agriculture, building protection, and industrial protection due to its excellent chemical stability, low cost, easy processability, and good waterproof and moisture-proof properties. Among them, multilayer co-extruded PE film, by compounding PE resins with different properties (such as LDPE, LLDPE, mLLDPE, etc.), can achieve synergistic optimization of mechanical, heat-sealing, barrier, and optical properties, thereby obtaining better overall performance.

[0003] In recent years, with the rapid development of logistics, transportation, and warehousing protection, the market demand for puncture-resistant multilayer co-extruded PE films has been continuously increasing. In practical applications, such as protective packaging for sharp objects, agricultural mulch films, and surface protective films for building waterproof membranes, PE films are required to have excellent puncture resistance, meaning that the film material is not easily punctured or broken when subjected to impact from sharp objects or continuous pressure.

[0004] However, traditional multilayer co-extruded PE films have poor puncture resistance. When punctured by a sharp object, stress is difficult to effectively disperse within the film surface, easily leading to stress concentration at the puncture point, which in turn causes brittle fracture or puncture damage. Furthermore, in multilayer co-extruded structures, since each PE layer is a non-polar material, the interlayer bonding strength is often low. Under puncture impact loads, delamination easily occurs between the layers, further weakening the overall puncture resistance of the film.

[0005] To improve the puncture resistance of PE films, the following methods are commonly used: First, simply increasing the density or molecular weight of the PE resin can improve puncture resistance, but this method leads to a significant decrease in the film's flexibility and processability, which is detrimental to industrial production. Second, traditional maleic anhydride-grafted PE is used as an interlayer compatibilizer, which can improve interlayer adhesion to some extent, but its absorption of puncture energy is limited. Third, inorganic fillers (such as calcium carbonate and talc) are introduced to enhance rigidity, but the poor interfacial compatibility between inorganic fillers and the PE matrix can easily become new stress concentration points, potentially reducing puncture resistance. Therefore, developing a multilayer co-extruded PE film with good puncture resistance is of great significance. Summary of the Invention

[0006] To address the aforementioned issues, this application provides a puncture-resistant multilayer co-extruded PE film, its preparation method, and its applications.

[0007] This application first provides a puncture-resistant multilayer co-extruded PE film with a total thickness of 60-100μm. From top to bottom, it consists of a surface PE layer, an adhesive layer, a core PE layer, an adhesive layer, a modified acrylic resin functional layer, an adhesive layer, and a surface PE layer. The modified acrylic resin functional layer comprises an acrylic resin copolymer and low-density polyethylene, and has a thickness of 10-20μm.

[0008] More preferably, the surface PE layer is metallocene linear low-density polyethylene with a thickness of 10-15 μm; and / or, the adhesive layer is linear low-density polyethylene containing 10-20 wt% maleic anhydride-grafted polyethylene with a thickness of 3-10 μm; and / or, the core PE layer is linear low-density polyethylene with a thickness of 15-20 μm.

[0009] A further preferred embodiment of the method for preparing the modified acrylic resin functional layer includes the following steps: S1: Butyl acrylate, octadecyl acrylate, methyl methacrylate, acrylic acid, emulsifier and water are stirred into a pre-emulsion, an initiator is added to carry out the reaction, and the reaction product is spray-dried to obtain an acrylic resin copolymer; S2: The acrylic resin copolymer is mixed with low-density polyethylene, extruded, and granulated.

[0010] More preferably, in step S1, the mass ratio of butyl acrylate, octadecyl acrylate, methyl methacrylate, and acrylic acid is (50-60):(20-30):(10-15):(5-10).

[0011] More preferably, in step S1, the emulsifier is an anionic emulsifier or a nonionic emulsifier; and / or, the initiator is ammonium persulfate or potassium persulfate; and / or, the reaction temperature is 70-90℃.

[0012] More preferably, in step S1, the inlet air temperature of the spray drying is 140-180℃, and the outlet air temperature is 60-90℃.

[0013] More preferably, in step S2, the mass ratio of acrylic resin copolymer to low-density polyethylene is (70-90):(10-30).

[0014] More preferably, in step S2, zinc oxide is also added, and the mass ratio of the acrylic resin copolymer to zinc oxide is 100:(0.5-3).

[0015] This application also provides a method for preparing a puncture-resistant multilayer co-extruded PE film, comprising the following steps: feeding each layer of raw material into a co-extrusion blown film unit, and then performing co-extrusion, blowing, cooling, and winding.

[0016] More preferably, the co-extrusion temperature is 180-210℃, the blow-up ratio is 2.5-3.0, and the draw ratio is 4.0-5.0.

[0017] Compared with the prior art, this application has the following beneficial effects: 1. The multilayer co-extruded PE film of this application has a gradually decreasing rigidity and a gradually increasing toughness from the outer layer to the inner layer, which can form a continuous modulus gradient, avoid stress abrupt changes, reduce stress concentration, and the functional layer has high toughness. When punctured by a sharp object, the functional layer can undergo large deformation, absorb impact energy through molecular chain slippage, crazes, shear bands, etc., inhibit crack propagation, and improve puncture resistance.

[0018] 2. The functional layer of this application contains long-chain alkyl groups, which are similar to the molecular chain structure of polyethylene. During the melt co-extrusion process, they can be embedded into the amorphous region of polyethylene to form a microscale interpenetrating network, improve the interfacial bonding strength, avoid macroscopic phase separation, and also help improve puncture resistance.

[0019] 3. This application utilizes the reaction of carboxyl groups and other functional groups with zinc oxide during melt co-extrusion to form an ionic cross-linking network, thereby achieving a synergistic improvement in interface strengthening and puncture resistance. Detailed Implementation

[0020] To make the inventive objectives, technical solutions, and beneficial technical effects of this application clearer, the following detailed description is provided in conjunction with embodiments, clearly and completely describing the technical solutions in the embodiments of this application. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0021] Based on extensive experimental research, this application provides a puncture-resistant multilayer co-extruded PE film with a total thickness of 60-100μm, for example, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 95μm, and 100μm. From top to bottom, it consists of a surface PE layer, an adhesive layer, a core PE layer, an adhesive layer, a modified acrylic resin functional layer, an adhesive layer, and a surface PE layer. The modified acrylic resin functional layer comprises an acrylic resin copolymer and low-density polyethylene, with a thickness of 10-20μm, for example, 10μm, 12μm, 14μm, 15μm, 16μm, 18μm, and 20μm.

[0022] In some embodiments of this application, the surface PE layer is metallocene linear low-density polyethylene with a thickness of 10-15 μm, for example, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, or 15 μm; and / or, the adhesive layer is linear low-density polyethylene containing 10-20 wt% maleic anhydride-grafted polyethylene with a thickness of 3-10 μm, for example, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, or 10 μm; and / or, the core PE layer is linear low-density polyethylene with a thickness of 15-20 μm, for example, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, or 20 μm.

[0023] In some embodiments of this application, the surface PE layer is metallocene linear low-density polyethylene with a high modulus, the core layer is linear low-density polyethylene with a lower modulus, and the modulus of the modified acrylic resin functional layer is further reduced, thus forming a modulus gradient, which can effectively buffer and transfer stress, avoid interface peeling, and thus improve puncture resistance.

[0024] In some embodiments of this application, the method for preparing the modified acrylic resin functional layer includes the following steps: S1: Butyl acrylate, octadecyl acrylate, methyl methacrylate, acrylic acid, emulsifier and water are stirred into a pre-emulsion, an initiator is added to carry out the reaction, and the reaction product is spray-dried to obtain an acrylic resin copolymer; S2: The acrylic resin copolymer is mixed with low-density polyethylene, extruded, and granulated.

[0025] In some embodiments of this application, octadecyl acrylate is introduced into the functional layer of the modified acrylic resin. Utilizing the high similarity between its long-chain alkyl groups and polyethylene segments, the long-chain alkyl groups can spontaneously embed into the amorphous regions of polyethylene during melt co-extrusion, forming a microscale interpenetrating network and thus preventing phase separation. Furthermore, polyethylene inevitably undergoes trace amounts of thermo-oxidative degradation during melting, generating active groups such as carbonyl, hydroxyl, and carboxyl groups. These groups can react with carboxyl groups in the modified acrylic resin or form hydrogen bonds, thereby creating anchor points at the interface and further improving the bonding strength between the modified acrylic resin and polyethylene.

[0026] Modified acrylic resin has high toughness. When punctured by a sharp object, the functional layer first undergoes large deformation. Through the dissipation capacity of molecular chain slippage, silver crazes are induced at stress concentration points, forming shear bands, which further absorb energy, thereby improving the puncture strength.

[0027] In some embodiments of this application, in step S1, the mass ratio of butyl acrylate, octadecyl acrylate, methyl methacrylate, and acrylic acid is (50-60):(20-30):(10-15):(5-10), for example, it can be 50:20:10:5, 50:20:10:10, 50:20:15:5, 50:20:15:10, 50:25:10:5, 50:25:10:10, 50:25:15:5, 50:25:15:10, 50:30:10:5, 50:30:10:10, 50:30:15:5, 50:30:15:10, 55:20:10:5, 55:20:10:10, 55: 20:15:5, 55:20:15:10, 55:25:10:5, 55:25:10:10, 55:25:15:5, 55:25:15:10, 55:30:10:5, 55:30:10:10, 55:30:15:5, 55:30:15:10, 60:20:10:5, 60 :20:10:10, 60:20:15:5, 60:20:15:10, 60:25:10:5, 60:25:10:10, 60:25:15:5, 60:25:15:10, 60:30:10:5, 60:30:10:10, 60:30:15:5, 60:30:15:10.

[0028] In some embodiments of this application, in step S1, the emulsifier is an anionic or nonionic emulsifier, for example, sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, sodium stearate, alkylphenol polyoxyethylene ether sulfate, Tween series, Span series; and / or, the initiator is ammonium persulfate or potassium persulfate; and / or, the reaction temperature is 70-90°C. For example, it can be 70°C, 75°C, 80°C, 85°C, or 90°C.

[0029] In some embodiments of this application, in step S1, the inlet air temperature of the spray drying is 140-180℃, for example, it can be 140℃, 145℃, 150℃, 155℃, 160℃, 165℃, 170℃, 175℃, or 180℃, and the outlet air temperature is 60-90℃, for example, it can be 60℃, 65℃, 70℃, 75℃, 80℃, 85℃, or 90℃.

[0030] In some embodiments of this application, in step S2, the mass ratio of acrylic resin copolymer to low-density polyethylene is (70-90):(10-30), for example, it can be 90:10, 85:15, 80:20, 75:25, or 70:30.

[0031] In some embodiments of this application, zinc oxide is also added in step S2, and the mass ratio of the acrylic resin copolymer to zinc oxide is 100:(0.5-3), for example, it can be 100:0.5, 100:1, 100:1.5, 100:2, 100:2.5, or 100:3.

[0032] In some embodiments of this application, during co-extrusion molten state, active groups such as carboxyl groups react with zinc oxide to form an ionic crosslinking network, which can achieve a synergistic improvement in interface strengthening and puncture resistance. During puncture, stress is transferred to each layer through the ionic network, stimulating larger-volume plastic deformation, dissipating energy, and avoiding stress concentration in a single layer or interface, thereby improving the puncture resistance of the PE film.

[0033] This application also provides a method for preparing a puncture-resistant multilayer co-extruded PE film, comprising the following steps: feeding each layer of raw material into a co-extrusion blown film unit, and then performing co-extrusion, blowing, cooling, and winding.

[0034] In some embodiments of this application, the co-extrusion temperature is 180-210℃, for example, it can be 180℃, 185℃, 190℃, 195℃, 200℃, 205℃, or 210℃; the blow-up ratio is 2.5-3.0, for example, it can be 2.5, 2.6, 2.7, 2.8, 2.9, or 3.0; and the draw ratio is 4.0-5.0, for example, it can be 4.0, 4.2, 4.5, 4.8, or 5.0.

[0035] The present application will be further illustrated by the following examples, but these examples do not limit the scope of the present application.

[0036] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise stated in this application, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. All reagents or instruments whose manufacturers are not specified are conventional products that can be purchased commercially. In addition to the specific methods, equipment, and materials used in the embodiments, based on the knowledge of the prior art possessed by one of ordinary skill in the art and the description in this application, any prior art methods, equipment, and materials similar to or equivalent to those described, used, or made by the methods, equipment, and materials in the embodiments of this application may be used to implement this application.

[0037] Example 1 The puncture-resistant multilayer co-extruded PE film of this embodiment comprises, from top to bottom, a surface PE layer, an adhesive layer, a core PE layer, an adhesive layer, a modified acrylic resin functional layer, an adhesive layer, and a surface PE layer. The surface PE layer is metallocene linear low-density polyethylene; the adhesive layer is linear low-density polyethylene containing 15 wt% maleic anhydride-grafted polyethylene; the core PE layer is linear low-density polyethylene; and the preparation method of the modified acrylic resin functional layer includes the following steps: S1: Take 550g of butyl acrylate, 250g of octadecyl acrylate, 150g of methyl methacrylate, 50g of acrylic acid, 8g of sodium dodecyl sulfate, and 800g of deionized water, add them to a high-speed disperser, disperse at 2000rpm for 30min to obtain a pre-emulsion; heat to 80℃, slowly add 100g of 5% ammonium persulfate aqueous solution to the pre-emulsion, complete the addition in 3h, keep warm for 1h after the addition is complete, then cool naturally to room temperature, add ammonia water to adjust the pH to 7.5, and spray dry at an inlet air temperature of 150℃ and an outlet air temperature of 70℃ to obtain an acrylic resin copolymer; S2: Weigh 800g of the above acrylic resin copolymer and 200g of low-density polyethylene granules, mix them in a high-speed mixer for 5 minutes, and then extrude and granulate them through a twin-screw extruder. The temperature of each section of the twin-screw extruder is set to 160℃, 170℃, 190℃, 180℃, 180℃, and 170℃. The method for preparing the puncture-resistant multilayer co-extruded PE film in this embodiment includes the following steps: The raw materials for each layer are fed into a seven-layer co-extrusion blown film unit. The materials and process parameters for each layer are as follows: the surface PE layer is 10μm thick and the extrusion temperature is 190℃; the adhesive layer is 5μm thick and the extrusion temperature is 195℃; the core PE layer is 15μm thick and the extrusion temperature is 200℃; the modified acrylic resin functional layer is 15μm thick and the extrusion temperature is 205℃; the blow-up ratio is 2.8; the traction ratio is 4.5; the cooling air ring velocity is 15m / s; the winding tension is 8N; and the film is allowed to stand for 24 hours after winding.

[0038] Example 2 The puncture-resistant multilayer co-extruded PE film of this embodiment comprises, from top to bottom, a surface PE layer, an adhesive layer, a core PE layer, an adhesive layer, a modified acrylic resin functional layer, an adhesive layer, and a surface PE layer. The surface PE layer is metallocene linear low-density polyethylene; the adhesive layer is linear low-density polyethylene containing 15 wt% maleic anhydride-grafted polyethylene; the core PE layer is linear low-density polyethylene; and the preparation method of the modified acrylic resin functional layer includes the following steps: S1: Take 550g of butyl acrylate, 250g of octadecyl acrylate, 150g of methyl methacrylate, 50g of acrylic acid, 8g of sodium dodecyl sulfate, and 800g of deionized water, add them to a high-speed disperser, disperse at 2000rpm for 30min to obtain a pre-emulsion; heat to 80℃, slowly add 100g of 5% ammonium persulfate aqueous solution to the pre-emulsion, complete the addition in 3h, keep warm for 1h after the addition is complete, then cool naturally to room temperature, add ammonia water to adjust the pH to 7.5, and spray dry at an inlet air temperature of 150℃ and an outlet air temperature of 70℃ to obtain an acrylic resin copolymer; S2: Weigh 800g of the above acrylic resin copolymer, 200g of low-density polyethylene granules and 12g of zinc oxide, mix them in a high-speed mixer for 5 minutes, and then extrude and granulate them through a twin-screw extruder. The temperature of each section of the twin-screw extruder is set to 160℃, 170℃, 190℃, 180℃, 180℃ and 170℃. The preparation method of the puncture-resistant multilayer co-extruded PE film in this embodiment is the same as that in Example 1.

[0039] Comparative Example 1 The multilayer co-extruded PE film of this comparative example consists of, from top to bottom, a surface PE layer, an adhesive layer, a core PE layer, an adhesive layer, and another surface PE layer. The surface PE layer is metallocene linear low-density polyethylene; the adhesive layer is linear low-density polyethylene containing 15 wt% maleic anhydride-grafted polyethylene; and the core PE layer is linear low-density polyethylene. The preparation method of the multilayer co-extruded PE film in this comparative example includes the following steps: The raw materials for each layer are fed into a five-layer co-extrusion blown film unit. The materials and process parameters for each layer are as follows: the thickness of the surface PE layer is 10μm, the extrusion temperature is 190℃, the thickness of the adhesive layer is 5μm, the extrusion temperature is 195℃, the thickness of the core PE layer is 35μm, the extrusion temperature is 200℃, the blow-up ratio is 2.5, the traction ratio is 4.0, the cooling air ring speed is 15m / s, the winding tension is 7.6N, and the film is allowed to stand for 24 hours after winding.

[0040] Comparative Example 2 The puncture-resistant multilayer co-extruded PE film of this comparative example comprises, from top to bottom, a surface PE layer, an adhesive layer, a core PE layer, an adhesive layer, a toughening functional layer, an adhesive layer, and a surface PE layer. The surface PE layer is metallocene linear low-density polyethylene; the adhesive layer is linear low-density polyethylene containing 15 wt% maleic anhydride-grafted polyethylene; the core PE layer is linear low-density polyethylene; and the toughening functional layer is low-density polyethylene containing 15% polyolefin elastomer toughening agent (POE). The preparation method of the puncture-resistant multilayer co-extruded PE film in this comparative example includes the following steps: The raw materials for each layer are fed into a seven-layer co-extrusion blown film unit. The materials and process parameters for each layer are as follows: the thickness of the surface PE layer is 10μm, the extrusion temperature is 190℃, the thickness of the adhesive layer is 5μm, the extrusion temperature is 195℃, the thickness of the core PE layer is 15μm, the extrusion temperature is 200℃, the thickness of the toughening functional layer is 15μm, the extrusion temperature is 205℃, the blow-up ratio is 2.8, the traction ratio is 4.5, the cooling air ring speed is 15m / s, the winding tension is 8N, and the film is allowed to stand for 24 hours after winding.

[0041] Performance testing The multilayer co-extruded PE films of Examples 1-2 and Comparative Examples 1-2 were subjected to the following performance tests: 1. Tensile property test The test samples were cut according to the standard GB / T 528-2009 and loaded onto the tensile testing machine as required. The tensile strength and elongation at break of the PE film were measured. The test rate was 200 mm / min. Five samples were tested in each group, and the average value was taken. The test results are shown in Table 1.

[0042] 2. Tear resistance test The test samples were cut according to the standard QB / T 1130-91 and loaded onto the tensile testing machine as required. The tear strength of the PE film was measured at a test rate of 200 mm / min. Five samples were tested in each group, and the average value was taken. The test results are shown in Table 1.

[0043] 3. Puncture resistance test The test samples were cut according to the standard GB / T 37841-2019 and loaded onto the tensile testing machine as required. The puncture strength of the PE film was measured at a test rate of 20 mm / min. Five samples were tested in each group, and the average value was taken. The test results are shown in Table 1.

[0044] Table 1 Performance test results of multilayer co-extruded PE films of Examples 1-2 and Comparative Examples 1-2 As can be seen from the tensile properties data in Table 1, the toughness of the multilayer co-extruded PE films of Examples 1 and 2 is greatly improved after the introduction of the modified acrylic resin functional layer, and the overall tensile strength is not weakened. In contrast, the elongation of Comparative Example 2 is large, but the tensile strength is also significantly reduced.

[0045] As can be seen from the tear strength and puncture strength data in Table 1, the multilayer co-extruded PE films of Examples 1-2 have high tear strength and puncture resistance, indicating good tear and puncture resistance. Comparative Example 2, due to its elastic buffer, also has better tear and puncture resistance than Comparative Example 1.

[0046] Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An anti-puncture multilayer co-extruded PE film, characterized in that: The total thickness is 60-100μm, and from top to bottom, it consists of a surface PE layer, an adhesive layer, a core PE layer, an adhesive layer, a modified acrylic resin functional layer, an adhesive layer, and a surface PE layer. The modified acrylic resin functional layer comprises an acrylic resin copolymer and low-density polyethylene, with a thickness of 10-20μm. The surface PE layer is metallocene linear low-density polyethylene, with a thickness of 10-15μm. And / or, the adhesive layer is linear low-density polyethylene containing 10-20wt% maleic anhydride-grafted polyethylene, with a thickness of 3-10μm. And / or, the core PE layer is linear low-density polyethylene, with a thickness of 15-20μm.

2. The puncture-resistant multilayer co-extruded PE film according to claim 1, characterized in that: The method for preparing the modified acrylic resin functional layer includes the following steps: S1: Butyl acrylate, octadecyl acrylate, methyl methacrylate, acrylic acid, emulsifier and water are stirred into a pre-emulsion, an initiator is added to carry out the reaction, and the reaction product is spray-dried to obtain an acrylic resin copolymer; S2: The acrylic resin copolymer is mixed with low-density polyethylene, extruded, and granulated.

3. The puncture resistant multilayer co-extruded PE film according to claim 2, characterized in that: In step S1, the mass ratio of butyl acrylate, octadecyl acrylate, methyl methacrylate, and acrylic acid is (50-60):(20-30):(10-15):(5-10).

4. The puncture resistant multilayer co-extruded PE film according to claim 2, characterized in that: In step S1, the emulsifier is an anionic emulsifier or a nonionic emulsifier; and / or, the initiator is ammonium persulfate or potassium persulfate; and / or, the reaction temperature is 70-90℃.

5. The puncture resistant multilayer co-extruded PE film according to claim 2, characterized in that: In step S1, the inlet air temperature of the spray dryer is 140-180℃, and the outlet air temperature is 60-90℃.

6. The puncture resistant multilayer co-extruded PE film according to claim 2, characterized in that: In step S2, the mass ratio of acrylic resin copolymer to low-density polyethylene is (70-90):(10-30).

7. The puncture-resistant multilayer co-extruded PE film according to claim 2, characterized in that: In step S2, zinc oxide is also added, and the mass ratio of the acrylic resin copolymer to zinc oxide is 100:(0.5-3).

8. A method for preparing a puncture-resistant multilayer co-extruded PE film according to any one of claims 1-7, characterized in that: The process includes the following steps: feeding each layer of raw material into a co-extrusion blown film unit, and then co-extruding, blowing, cooling, and rewinding the film.

9. The method for preparing a puncture-resistant multilayer co-extruded PE film according to claim 8, characterized in that: The co-extrusion temperature is 180-210℃, the blow-up ratio is 2.5-3.0, and the draw ratio is 4.0-5.0.

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