Vacuum packaging bag paper-plastic film for medical equipment and preparation method of vacuum packaging bag paper-plastic film

Abstract

The invention relates to the technical field of paper-plastic films, in particular to a vacuum packaging bag paper-plastic film for medical instruments and a preparation method of the vacuum packaging bag paper-plastic film. The vacuum packaging bag paper-plastic film for the medical equipment comprises a heat sealing layer, a core layer covering one side of the heat sealing layer and a corona layer covering one side of the core layer, the heat sealing layer is prepared from the following raw materials: isotactic polypropylene, an anti-blocking agent and composite POE; the core layer is prepared from the following raw materials: isotactic polypropylene, ethylene-vinyl acetate copolymer and composite POE (Polyolefin Elastomer); the corona layer is prepared from the following raw materials: an ethylene-vinyl acetate copolymer, thermoplastic polyolefin, an antioxidant and a light stabilizer; wherein the composite POE is prepared from the following raw materials in parts by mass: 30 to 50 parts of polyethylene octylene co-elastomer, 5 to 10 parts of maleic anhydride grafted POE, 1 to 2 parts of amino-terminated polyamidoamine and 0.1 to 1 part of polyethylene wax. The forming die is simple in structure, reasonable in design, capable of being heat-sealed with medical paper after being formed, capable of effectively improving the overall strength and the forming effect of products and suitable for large-scale application and popularization.

Description

Technical Field

[0001] The present invention relates to the technical field of paper-plastic films, and in particular to a paper-plastic film for a vacuum packaging bag for medical devices and a preparation method thereof. Background Art

[0002] At present, the commonly used medical sterilization packaging materials in China mainly include all-cotton cloth, rigid containers, non-woven fabrics, crepe paper, and paper-plastic films. Among them, all-cotton cloth and rigid containers are reusable packaging materials, while the other three types of packaging materials are disposable packaging materials.

[0003] With the development of technology, paper-plastic films, as packaging films, are widely used in many fields. Since medical devices have high requirements for packaging materials, in addition to meeting the basic packaging properties such as protecting and isolating the external environment of conventional films, the stability of material properties is more emphasized. As a disposable medical sterilization packaging material, the medical sterilization packaging paper-plastic film has good air permeability, is conducive to the penetration of sterilization media, has high bacteria-blocking performance after sterilization, and has good transparency and is easy to open. At present, it has been widely promoted and applied.

[0004] In the paper-plastic material structure of medical sterilization packaging, the polypropylene film has the advantages of high transparency, good stiffness, and high heat resistance, and can be heat-sealed with paper to form a paper-plastic bag. However, the disadvantages are poor tear resistance, and problems such as insufficient paper / plastic heat-sealing fastness and poor mechanical properties of the film often occur during use. Summary of the Invention

[0005] The purpose of the present invention is to solve the disadvantages existing in the prior art, and to propose a paper-plastic film for a vacuum packaging bag for medical devices and a preparation method thereof.

[0006] A paper-plastic film for a vacuum packaging bag for medical devices includes: a heat-sealing layer, a core layer covered on one side of the heat-sealing layer, and a corona layer covered on one side of the core layer; the raw materials of the heat-sealing layer by mass include: 80-120 parts of isotactic polypropylene, 1-2 parts of an anti-blocking agent, and 1-5 parts of a composite POE; the raw materials of the core layer by mass include: 80-120 parts of isotactic polypropylene, 1-2 parts of ethylene-vinyl acetate copolymer, and 1-5 parts of a composite POE; the raw materials of the corona layer by mass include: 80-120 parts of ethylene-vinyl acetate copolymer, 1-3 parts of a thermoplastic polyolefin, 1-2 parts of an antioxidant, and 1-2 parts of a light stabilizer.

[0007] Among them, the raw materials of the composite POE by mass include: 30-50 parts of polyethylene octene co-elastic body, 5-10 parts of maleic anhydride grafted POE, 1-2 parts of terminal amino polyamidoamine, and 0.1-1 part of polyethylene wax.

[0008] Preferably, the thickness ratio of the corona layer, the core layer, and the heat-sealing layer is 0.1-0.5:1-2:1.

[0009] Preferably, the isotacticity of the isotactic polypropylene is 93-96%, and the melt index at 230°C with a load of 2.16 kg is 2-6 g / 10 min.

[0010] Preferably, in the ethylene-vinyl acetate copolymer used for the core layer, the mass content of vinyl acetate is 6-10%, and the melt index at 190°C with a load of 2.16 kg is 8-10 g / 10 min.

[0011] Preferably, in the ethylene-vinyl acetate copolymer used for the corona layer, the mass content of vinyl acetate is 14-19%, and the melt index at 190°C with a load of 2.16 kg is 16-20 g / 10 min.

[0012] Preferably, the composite POE is prepared by the following specific operation: uniformly mixing maleic anhydride-grafted POE, terminal amino polyamidoamine, and polyethylene wax, stirring at 100-120°C for 10-30 min, adding polyethylene octene co-elastic body thereto, and stirring at 130-140°C for 5-10 min.

[0013] Preferably, the grafting rate of the maleic anhydride-grafted POE is 1.0-1.3%.

[0014] The preparation method of the vacuum packaging bag paper-plastic film for medical devices includes the following steps: melt co-extruding the raw materials of the corona layer, core layer, and heat-sealing layer, casting, and then performing rapid cooling and shaping, stretching, and corona treatment.

[0015] A vacuum paper-plastic packaging bag for medical devices is formed by heat-sealing the above-mentioned vacuum packaging bag paper-plastic film for medical devices and medical paper around the perimeter, so that one side of the paper-plastic packaging bag is medical paper and the other side is the above-mentioned film.

[0016] Preferably, the medical paper is any one of base-coated medical paper, ethylene oxide sterilized dialysis paper, and steam sterilized dialysis paper.

[0017] Beneficial effects: The structure of the present invention is simple and reasonably designed. It is prepared by a three-layer co-agent and casting production process. After forming, it can be heat-sealed with medical paper and is used for the sterile packaging of various medical devices. It can effectively improve the overall strength and forming effect of the product and is suitable for large-scale popularization and application.

[0018] In the composite POE used in the present invention, the terminal amino polyamidoamine is connected to the maleic anhydride-grafted POE through an amino group, and then blended with the polyethylene octene co-elastic body. This can not only effectively improve the mechanical properties of the polyethylene octene co-elastic body, but also be compounded with isotactic polypropylene, with high dispersion uniformity among each other. It dissipates energy during fracture, prevents stress concentration, and thus produces an effect of enhancing toughness, effectively improving the mechanical properties of the product.

[0019] In the present invention, composite POE is incorporated into isotactic polypropylene, which can not only improve the heat-sealing strength between the film and paper, but also endow the film with excellent right-angle tear strength. Meanwhile, it does not affect the haze of the film, and the film still has good transparency, meeting the transparency requirements of medical sterilization paper-plastic films. Description of the Drawings

[0020] Figure 1 It is a comparison chart of the Young's modulus of the films obtained in Example 5 and Comparative Examples 1-2.

[0021] Figure 2 It is a comparison chart of the haze value and right-angle tear strength of the films obtained in Example 5 and Comparative Examples 1-2.

[0022] Figure 3 It is a comparison chart of the heat-sealing strength after the films obtained in Example 5 and Comparative Examples 1-2 are heat-sealed with ethylene oxide sterilized dialysis paper. Detailed Embodiments

[0023] The present invention will be further illustrated below in conjunction with specific embodiments.

[0024] The isotactic polypropylene used below is sourced from Yanshan Petrochemical, with the grade of K1005, and the melt index at 230°C and 2.16 kg is 5.5 g / 10 min. The ethylene-vinyl acetate copolymer used for the core layer below is sourced from LyondellBasell, with the grade of G MU76300, the vinyl acetate content is 9 wt%, and the melt index at 190°C and 2.16 kg is 10 g / 10 min. The ethylene-vinyl acetate copolymer used for the corona layer below is sourced from Asia Polymer, with the grade of Polymer-E V18161, the vinyl acetate content is 18 wt%, and the melt index at 190°C and 2.16 kg is 16 g / 10 min. The thermoplastic polyolefin used below is sourced from LyondellBasell, with the grade of 9305TC. The polyethylene octene co-elastic body used below is sourced from Exxon, with the grade of 6202. The maleic anhydride grafted POE is purchased from Cocomos Chemical Co., Ltd., with the grade of W1 and the grafting rate of 1.1%.

[0025] Example 1 A vacuum packaging bag paper-plastic film for medical devices, with a thickness of 30 μm, includes: a heat-sealing layer with a thickness of 2 μm, a core layer with a thickness of 14 μm covering one side of the heat-sealing layer, and a corona layer with a thickness of 14 μm covering one side of the core layer.

[0026] The raw materials of the heat-sealing layer include: 80 g of isotactic polypropylene, 1 g of fumed silica, and 1 g of composite POE.

[0027] The raw materials of the core layer include: 80 g of isotactic polypropylene, 1 g of ethylene-vinyl acetate copolymer, and 1 g of composite POE.

[0028] The raw materials for the corona layer include: 80 g of ethylene-vinyl acetate copolymer, 1 g of thermoplastic polyolefin, 1 g of antioxidant 1076, and 1 g of light stabilizer.

[0029] Among them, the raw materials for the composite POE include: 30 g of polyethylene octene co-elastic body, 5 g of maleic anhydride grafted POE, 1 g of terminal amino polyamide amine, and 0.1 g of polyethylene wax; and it is prepared by the following specific operations: Mix the maleic anhydride grafted POE, terminal amino polyamide amine, and polyethylene wax evenly, stir at a temperature of 100 °C for 10 min, with a stirring speed of 100 r / min, add the polyethylene octene co-elastic body to it, and stir at a temperature of 130 °C for 5 min, with a stirring speed of 20 r / min.

[0030] The preparation method of the above-mentioned vacuum packaging bag paper-plastic film for medical devices includes the following steps: Melt and co-extrude the raw materials of the corona layer, the core layer, and the heat-sealing layer, send them into a T-shaped die head and cast them onto a casting roll, and then rapidly cool, shape, stretch, and corona-treat the cast molten film.

[0031] Example 2 A vacuum packaging bag paper-plastic film for medical devices, with a thickness of 38 μm, includes: a heat-sealing layer with a thickness of 5 μm, a core layer with a thickness of 22 μm covering one side of the heat-sealing layer, and a corona layer with a thickness of 11 μm covering one side of the core layer.

[0032] The raw materials for the heat-sealing layer include: 120 g of isotactic polypropylene, 2 g of fumed silica, and 5 g of composite POE.

[0033] The raw materials for the core layer include: 120 g of isotactic polypropylene, 2 g of ethylene-vinyl acetate copolymer, and 5 g of composite POE.

[0034] The raw materials for the corona layer include: 120 g of ethylene-vinyl acetate copolymer, 3 g of thermoplastic polyolefin, 2 g of antioxidant 1076, and 2 g of light stabilizer.

[0035] Among them, the raw materials for the composite POE include: 50 g of polyethylene octene co-elastic body, 10 g of maleic anhydride grafted POE, 2 g of terminal amino polyamide amine, and 1 g of polyethylene wax; and it is prepared by the following specific operations: Mix the maleic anhydride grafted POE, terminal amino polyamide amine, and polyethylene wax evenly, stir at a temperature of 120 °C for 30 min, with a stirring speed of 200 r / min, add the polyethylene octene co-elastic body to it, and stir at a temperature of 140 °C for 10 min, with a stirring speed of 40 r / min.

[0036] The preparation method of the above-mentioned vacuum packaging bag paper-plastic film for medical devices includes the following steps: Melt and co-extrude the raw materials of the corona layer, the core layer, and the heat-sealing layer, send them into a T-shaped die head and cast them onto a casting roll, and then rapidly cool, shape, stretch, and corona-treat the cast molten film.

[0037] Example 3 A paper-plastic film for vacuum packaging bag of medical device, with a thickness of 35 μm, comprising: a heat-sealing layer with a thickness of 12 μm, a core layer with a thickness of 19 μm coated on one side of the heat-sealing layer, and a corona layer with a thickness of 4 μm coated on one side of the core layer.

[0038] The raw materials of the heat-sealing layer include: 90 g of isotactic polypropylene, 1.8 g of fumed silica, and 2 g of compound POE.

[0039] The raw materials of the core layer include: 110 g of isotactic polypropylene, 1.3 g of ethylene-vinyl acetate copolymer, and 4 g of compound POE.

[0040] The raw materials of the corona layer include: 90 g of ethylene-vinyl acetate copolymer, 2.5 g of thermoplastic polyolefin, 1.3 g of antioxidant 1076, and 1.7 g of light stabilizer.

[0041] Among them, the raw materials of the compound POE include: 35 g of polyethylene octene copolymer elastomer, 9 g of maleic anhydride grafted POE, 1.3 g of terminal amino polyamidoamine, and 0.8 g of polyethylene wax; and it is prepared by the following specific operations: mix maleic anhydride grafted POE, terminal amino polyamidoamine, and polyethylene wax evenly, stir at a temperature of 105 °C for 25 min, with a stirring speed of 120 r / min, add polyethylene octene copolymer elastomer to it, and stir at a temperature of 137 °C for 7 min, with a stirring speed of 35 r / min.

[0042] The preparation method of the above-mentioned paper-plastic film for vacuum packaging bag of medical device includes the following steps: melt and co-extrude the raw materials of the corona layer, the core layer and the heat-sealing layer, send them into a T-shaped die head and cast them onto a casting roll, and then rapidly cool, shape, stretch and corona-treat the cast molten film.

[0043] Example 4 A paper-plastic film for vacuum packaging bag of medical device, with a thickness of 35 μm, comprising: a heat-sealing layer with a thickness of 12 μm, a core layer with a thickness of 19 μm coated on one side of the heat-sealing layer, and a corona layer with a thickness of 4 μm coated on one side of the core layer.

[0044] The raw materials of the heat-sealing layer include: 110 g of isotactic polypropylene, 1.2 g of fumed silica, and 4 g of compound POE.

[0045] The raw materials of the core layer include: 90 g of isotactic polypropylene, 1.8 g of ethylene-vinyl acetate copolymer, and 2 g of compound POE.

[0046] The raw materials of the corona layer include: 110 g of ethylene-vinyl acetate copolymer, 1.5 g of thermoplastic polyolefin, 1.7 g of antioxidant 1076, and 1.3 g of light stabilizer.

[0047] Among them, the raw materials of the composite POE include: 45 g of polyethylene octene copolymer elastomer, 6 g of maleic anhydride grafted POE, 1.7 g of terminal amino polyamide amine, and 0.2 g of polyethylene wax; and it is prepared by the following specific operations: Mix the maleic anhydride grafted POE, terminal amino polyamide amine, and polyethylene wax evenly, stir at a temperature of 115 °C for 15 min, with a stirring speed of 180 r / min, add the polyethylene octene copolymer elastomer thereto, and stir at a temperature of 133 °C for 9 min, with a stirring speed of 25 r / min.

[0048] The preparation method of the above-mentioned vacuum packaging bag paper-plastic film for medical devices includes the following steps: Melt and co-extrude the raw materials of the corona layer, core layer, and heat-sealing layer, feed them into a T-shaped die head and cast them onto a casting roll, and then rapidly cool, shape, stretch, and corona-treat the cast molten film.

[0049] Example 5 A vacuum packaging bag paper-plastic film for medical devices, with a thickness of 35 μm, includes: a heat-sealing layer with a thickness of 12 μm, a core layer with a thickness of 19 μm covering one side of the heat-sealing layer, and a corona layer with a thickness of 4 μm covering one side of the core layer.

[0050] The raw materials of the heat-sealing layer include: 100 g of isotactic polypropylene, 1.5 g of fumed silica, and 3 g of composite POE.

[0051] The raw materials of the core layer include: 100 g of isotactic polypropylene, 1.5 g of ethylene-vinyl acetate copolymer, and 3 g of composite POE.

[0052] The raw materials of the corona layer include: 100 g of ethylene-vinyl acetate copolymer, 2 g of thermoplastic polyolefin, 1.5 g of antioxidant 1076, and 1.5 g of light stabilizer.

[0053] Among them, the raw materials of the composite POE include: 40 g of polyethylene octene copolymer elastomer, 8 g of maleic anhydride grafted POE, 1.5 g of terminal amino polyamide amine, and 0.5 g of polyethylene wax; and it is prepared by the following specific operations: Mix the maleic anhydride grafted POE, terminal amino polyamide amine, and polyethylene wax evenly, stir at a temperature of 110 °C for 20 min, with a stirring speed of 150 r / min, add the polyethylene octene copolymer elastomer thereto, and stir at a temperature of 135 °C for 8 min, with a stirring speed of 30 r / min.

[0054] The preparation method of the above-mentioned vacuum packaging bag paper-plastic film for medical devices includes the following steps: Melt and co-extrude the raw materials of the corona layer, core layer, and heat-sealing layer, feed them into a T-shaped die head and cast them onto a casting roll, and then rapidly cool, shape, stretch, and corona-treat the cast molten film.

[0055] Comparative Example 1 A plastic-paper film for vacuum packaging bag of medical device, with a thickness of 35μm, comprising: a heat-sealing layer with a thickness of 12μm, a core layer with a thickness of 19μm coated on one side of the heat-sealing layer, and a corona layer with a thickness of 4μm coated on one side of the core layer.

[0056] The raw materials of the heat-sealing layer include: 100g of isotactic polypropylene, 1.5g of fumed silica, and 3g of polyethylene octene copolymer elastomer.

[0057] The raw materials of the core layer include: 100g of isotactic polypropylene, 1.5g of ethylene-vinyl acetate copolymer, and 3g of composite POE.

[0058] The raw materials of the corona layer include: 100g of ethylene-vinyl acetate copolymer, 2g of thermoplastic polyolefin, 1.5g of antioxidant 1076, and 1.5g of light stabilizer.

[0059] Among them, the raw materials of the composite POE include: 40g of polyethylene octene copolymer elastomer, 8g of maleic anhydride grafted POE, 1.5g of terminal amino polyamidoamine, and 0.5g of polyethylene wax; and it is prepared by the following specific operations: mixing maleic anhydride grafted POE, terminal amino polyamidoamine, and polyethylene wax evenly, stirring at a temperature of 110°C for 20min, with a stirring speed of 150r / min, adding polyethylene octene copolymer elastomer to it, and stirring at a temperature of 135°C for 8min, with a stirring speed of 30r / min.

[0060] The preparation method of the above-mentioned plastic-paper film for vacuum packaging bag of medical device includes the following steps: melting and co-extruding the raw materials of the corona layer, the core layer, and the heat-sealing layer, feeding them into a T-shaped die head and casting them onto a casting roll, and then quickly cooling, stretching, and corona treating the cast molten film.

[0061] Comparative Example 2 A plastic-paper film for vacuum packaging bag of medical device, with a thickness of 35μm, comprising: a heat-sealing layer with a thickness of 12μm, a core layer with a thickness of 19μm coated on one side of the heat-sealing layer, and a corona layer with a thickness of 4μm coated on one side of the core layer.

[0062] The raw materials of the heat-sealing layer include: 100g of isotactic polypropylene, 1.5g of fumed silica, and 3g of composite POE.

[0063] The raw materials of the core layer include: 100g of isotactic polypropylene, 1.5g of ethylene-vinyl acetate copolymer, and 3g of composite POE.

[0064] The raw materials of the corona layer include: 100g of ethylene-vinyl acetate copolymer, 2g of thermoplastic polyolefin, 1.5g of antioxidant 1076, and 1.5g of light stabilizer.

[0065] Among them, the raw materials of the composite POE include: 40 g of polyethylene octene copolymer elastomer, 9.5 g of maleic anhydride grafted POE, and 0.5 g of polyethylene wax; and it is prepared by the following specific operations: Mix the maleic anhydride grafted POE and polyethylene wax evenly, stir at a temperature of 110 °C for 20 min, with a stirring speed of 150 r / min, add the polyethylene octene copolymer elastomer to it, and stir at a temperature of 135 °C for 8 min, with a stirring speed of 30 r / min.

[0066] The preparation method of the above-mentioned vacuum packaging bag paper-plastic film for medical devices includes the following steps: Melt and co-extrude the corona layer, core layer, and heat-sealing layer raw materials, feed them into a T-shaped die head and cast them onto a casting roll, and then rapidly cool, stretch, and corona-treat the cast molten film.

[0067] Refer to GB / T 1040.3-2006 "Plastics - Determination of tensile properties - Part 3: Test conditions for films and sheets" to measure the Young's modulus of the films obtained in Example 5 and Comparative Examples 1-2.

[0068] As Figure 1 shown, the longitudinal / transverse Young's modulus of the film obtained in Example 5 is the highest, superior to that of Comparative Examples 1-2 (P < 0.05).

[0069] Refer to GB / T 2410-2008 "Determination of light transmittance and haze of transparent plastics" to measure the haze value of the films obtained in Example 5 and Comparative Examples 1-2. Refer to QB / T 1130-1991 "Test method for right-angle tear properties of plastics" to measure the right-angle tear strength of the films obtained in Example 5 and Comparative Examples 1-2.

[0070] As Figure 2 shown, the haze value of the film obtained in Example 5 is the lowest, while the right-angle tear strength is the highest, superior to that of Comparative Examples 1-2 (P < 0.05).

[0071] After laminating the films obtained in Example 5 and Comparative Examples 1-2 with ethylene oxide sterilized dialysis paper, refer to QB / T 2358-1998 "Test method for heat-sealing strength of plastic film packaging bags" to measure the heat-sealing strength of each group of specimens.

[0072] As Figure 3 shown, after laminating with the film obtained in Example 5, its heat-sealing strength is the highest, superior to that of Comparative Examples 1-2 (P < 0.05).

[0073] The applicant believes that: in the composite POE used in the present invention, the terminal amino polyamide amine is connected to the maleic anhydride grafted POE through the amino group and then blended with the polyethylene octene coelastomer, which can not only effectively improve the mechanical properties of the polyethylene octene coelastomer, but also be compounded with isotactic polypropylene with high dispersion uniformity between each other, dissipate energy at break, prevent stress concentration, and thus produce the effect of enhancing and toughening, effectively improving the mechanical properties of the product. At the same time, in the present invention, the composite POE is mixed into the isotactic polypropylene, which can not only improve the heat seal strength between the film and the paper, but also the film has excellent right-angle tear strength and does not affect the haze of the film, and the film still has good transparency.

[0074] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A vacuum packaging bag paper-plastic film for medical devices, characterized in that, Including: A heat-sealing layer, a core layer coated on one side of the heat-sealing layer, and a corona layer coated on one side of the core layer; The raw materials of the heat-sealing layer by mass parts include: 80 - 120 parts of isotactic polypropylene, 1 - 2 parts of anti-blocking agent, and 1 - 5 parts of composite POE; The raw materials of the core layer by mass parts include: 80 - 120 parts of isotactic polypropylene, 1 - 2 parts of ethylene-vinyl acetate copolymer, and 1 - 5 parts of composite POE; The raw materials of the corona layer by mass parts include: 80 - 120 parts of ethylene-vinyl acetate copolymer, 1 - 3 parts of thermoplastic polyolefin, 1 - 2 parts of antioxidant, and 1 - 2 parts of light stabilizer; Among them, the raw materials of the composite POE by mass parts include: 30 - 50 parts of polyethylene octene co-elastic body, 5 - 10 parts of maleic anhydride grafted POE, 1 - 2 parts of terminal amino polyamidoamine, and 0.1 - 1 part of polyethylene wax.

2. The vacuum packaging bag paper-plastic film for medical devices according to claim 1, wherein The thickness ratio of the corona layer, the core layer and the heat-sealing layer is 0.1 - 0.5:1 - 2:

1.

3. The vacuum packaging bag paper-plastic film for medical devices according to claim 1, wherein, The isotacticity of the isotactic polypropylene is 93 - 96%, and the melt index at 230℃ and 2.16 kg is 2 - 6 g / 10 min.

4. The vacuum packaging bag paper-plastic film for medical devices according to claim 1, characterized in that, In the ethylene-vinyl acetate copolymer used in the core layer, the mass content of vinyl acetate is 6 - 10%, and the melt index at 190℃ and 2.16 kg is 8 - 10 g / 10 min.

5. The vacuum packaging bag paper-plastic film for medical devices according to claim 1, characterized in that, In the ethylene-vinyl acetate copolymer used in the corona layer, the mass content of vinyl acetate is 14 - 19%, and the melt index at 190℃ and 2.16 kg is 16 - 20 g / 10 min.

6. The vacuum packaging bag paper-plastic film for medical devices according to claim 1, wherein The composite POE is prepared by the following specific operations: Mix the maleic anhydride grafted POE, terminal amino polyamidoamine, and polyethylene wax evenly, stir at 100 - 120℃ for 10 - 30 min, add the polyethylene octene co-elastic body thereto, and stir at 130 - 140℃ for 5 - 10 min.

7. The vacuum packaging bag paper-plastic film for medical devices according to claim 6, wherein The grafting rate of the maleic anhydride grafted POE is 1.0 - 1.3%.

8. A method for preparing a paper-plastic film for a vacuum packaging bag of a medical device according to any one of claims 1-7, characterized in that, Including the following steps: Melt and co-extrude the raw materials of the corona layer, the core layer and the heat-sealing layer, cast, and then perform rapid cooling and shaping, stretching, and corona treatment.

9. A vacuum paper-plastic packaging bag for medical devices, characterized in that It is formed by hot laminating with the vacuum packaging bag paper-plastic film for medical devices described in any one of claims 1 - 7 and medical paper.

10. The vacuum paper-plastic packaging bag for medical devices according to claim 9, characterized in that, The medical paper is any one of base-coated medical paper, ethylene oxide sterilized dialysis paper, and steam sterilized dialysis paper.

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