Nine-layer co-extruded high barrier film for liquid

Abstract

The present application relates to the technical field of soft package high polymer film material, in particular to a nine-layer co-extrusion high barrier film for liquid, which is used to solve the problem that the existing barrier film has limited barrier ability to oxygen and water vapor and poor mechanical performance; the nine-layer co-extrusion high barrier film uses barrier material as the middle E layer, is matched with the symmetrical upper and lower bonding layer structure, realizes the molecular level close combination of each functional layer through the nine-layer synchronous co-extrusion process, and makes the thickness of the symmetrical positions on both sides the same, so that the nine-layer co-extrusion high barrier film can be formed, oxygen and water vapor can be efficiently blocked, the mechanical performance of the nine-layer co-extrusion high barrier film can be significantly improved, the nine-layer co-extrusion high barrier film is not easy to crack, delaminate and break in complex working conditions, and the structural stability and service life of the nine-layer co-extrusion high barrier film are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of flexible packaging polymer film materials technology, specifically a nine-layer co-extruded high-barrier film for liquids. Background Technology

[0002] High-barrier films are widely used in food preservation, pharmaceutical packaging, fine chemical raw material sealing, and vacuum preservation. The barrier properties and mechanical properties of the film directly determine the storage period and reliability of the packaged products. Currently, most mainstream high-barrier films on the market adopt a five-layer or seven-layer co-extruded structure, with EVOH material as the core barrier layer. However, due to the limited number of layers and the simple ratio of functional layers, the film has poor continuity and insufficient crystal density, resulting in defects such as local thin spots and microscopic pinholes. Its ability to block oxygen and water vapor is limited, making it difficult to meet the long-term moisture-proof, oxidation-proof, and long-lasting preservation requirements of high-end products. Secondly, EVOH material itself has inherent material defects; it is brittle and has poor tensile and impact resistance. This makes the barrier film prone to cracking, delamination, and damage under conditions of high-speed packaging, vacuum sealing, low-temperature storage and transportation, and repeated bending, resulting in poor product yield and usage stability.

[0003] To address the aforementioned technical shortcomings, a solution is proposed. Summary of the Invention

[0004] In order to overcome the above-mentioned technical problems, the present invention aims to provide a nine-layer co-extruded high-barrier film for liquids, which solves the problems that existing barrier films have limited ability to block oxygen and water vapor and poor mechanical properties.

[0005] The objective of this invention can be achieved through the following technical solutions: In one aspect, this application provides a nine-layer co-extruded high-barrier membrane for liquids, comprising a nine-layer structure, which from top to bottom are layer A, layer B, layer C, layer D, layer E, layer F, layer G, layer H and layer I; Layer A is a printable functional layer, and the printable functional layer comprises the following raw materials in parts by weight: The film contains 20-24 parts high-pressure material, 30-35 parts polyolefin elastomer, 1 part bentonite, and 50-58 parts metallocene polyolefin plasmon. Bentonite has a unique lamellar two-dimensional structure that can form a dense barrier network with interlaced stacking in the polymer matrix, prolonging the permeation path of oxygen and water vapor inside the film, effectively reducing the gas and water vapor permeability, and helping to improve the overall barrier stability of the nine-layer co-extruded film. It forms a synergistic barrier effect with the core EVOH barrier layer. Furthermore, the nano-scale lamellar bentonite can uniformly fill the micropores of the matrix, reducing problems such as stretching deformation, winding warping, and dimensional shrinkage that occur during film production and subsequent use. Bentonite also has excellent UV shielding, heat insulation, and anti-exudation properties, which can effectively resist the erosion of the PE layer by external ultraviolet rays and temperature and humidity changes, delay the aging, embrittlement, and yellowing of the film, and extend the service life of the nine-layer co-extruded high-barrier film. Layer B is an outer buffer blend layer, which comprises the following raw materials in parts by weight: 20-24 parts of high-pressure material, 30-35 parts of polyolefin elastomer, and 50-58 parts of metallocene polyolefin plasmid; The C layer is an outer transition blend layer, and the outer transition blend layer comprises the following raw materials in parts by weight: 40-45 parts of metallocene polyethylene, 40-45 parts of linear low-density polyethylene, and 20-22 parts of high-pressure compound; The D layer is an upper adhesive layer, and the raw material of the upper adhesive layer is an adhesive. The E layer is a high-barrier layer, and the raw material of the high-barrier layer is a barrier material; The F layer is a lower adhesive layer, and the raw material of the lower adhesive layer is an adhesive. The G layer is an inner transition blend layer, and the inner transition blend layer comprises the following raw materials in parts by weight: 30-34 parts of metallocene polyolefin plasmon, 20-22 parts of polyolefin elastomer, 20-24 parts of high-pressure compound, and 30-36 parts of linear low-density polyethylene. The H layer is an inner heat-sealing functional layer, and the inner heat-sealing functional layer comprises the following raw materials in parts by weight: 75-79 parts of metallocene polyethylene, 28-30 parts of polyolefin elastomer, and 2-3 parts of processing aids; The innermost heat-sealing functional layer (layer I) comprises the following raw materials in parts by weight: The composition includes 75-79 parts of metallocene polyethylene, 28-30 parts of polyolefin elastomer, 1 part of bentonite, and 2-3 parts of processing aids.

[0006] In a preferred embodiment of the present invention, the thickness of the nine-layer co-extruded high-barrier film is 90-120 μm.

[0007] In a preferred embodiment of the present invention, the thickness ratio of the A layer, B layer, C layer, D layer, E layer, F layer, G layer, H layer and I layer is 5:7:5:7:5:7:5:7:5.

[0008] In a preferred embodiment of the present invention, the high-pressure material is LDPE 2426H; the polyolefin elastomer is POE 3020FL.

[0009] In a preferred embodiment of the present invention, the metallocene polyolefin plastomer is PL 1881G; and the metallocene polyethylene is INNATE ST50.

[0010] In a preferred embodiment of the present invention, the linear low-density polyethylene is LLDPE LL 1001X72; and the binder is binder NF529.

[0011] In a preferred embodiment of the present invention, the barrier material is EVOH F171B; the processing aid is a copolymer of 1,1-difluoroethylene, 1,1,2,3,3,3-hexafluoro-1-propylene and tetrafluoroethylene, with CAS number 25190-89-0. During the extrusion process, this processing aid can spontaneously migrate to the interface between the melt and the die metal, forming a uniform and stable ultra-thin lubricating layer, effectively reducing the frictional resistance between the melt and the equipment flow channel and die. Considering the complex flow channel of the nine-layer co-extrusion structure, the high shear rate of simultaneous extrusion of multi-layer melts, and the high die head pressure, this processing aid can significantly suppress melt fracture under high shear conditions, thoroughly improve the appearance defects of the film surface such as sharkskin, pitting, ripples, and orange peel, and greatly improve the surface smoothness and flatness of the film.

[0012] In a preferred embodiment of the present invention, the nine-layer co-extruded high-barrier film is prepared by the following steps: The raw materials for layers A, B, C, D, E, F, G, H, and I are respectively added to nine different extruders numbered A, B, C, D, E, F, G, H, and I. After being melted and extruded into the die, they are combined and extruded, blown into a film, and then subjected to corona treatment with 42-46 dynes to obtain a master roll film. After aging treatment, the master roll film is slit to obtain a nine-layer co-extruded high-barrier film with a thickness of 9-12 mils.

[0013] In a preferred embodiment of the present invention, the temperature of the extruder designated A is 210°C in zone 1, 215°C in zone 2, 215°C in zone 3, 215°C in zone 4, 215°C in zone 5, 215°C in zone 6, and 215°C in zone 7.

[0014] In a preferred embodiment of the present invention, the temperature of the extruder designated as B is 210°C in zone one, 215°C in zone two, 215°C in zone three, 215°C in zone four, 215°C in zone five, 215°C in zone six, and 215°C in zone seven.

[0015] In a preferred embodiment of the present invention, the temperature of the extruder designated C is 210°C in zone one, 215°C in zone two, 215°C in zone three, 215°C in zone four, 215°C in zone five, 215°C in zone six, and 215°C in zone seven.

[0016] In a preferred embodiment of the present invention, the temperature of the extruder designated as D is 210°C in zone 1, 230°C in zone 2, 230°C in zone 3, 230°C in zone 4, 230°C in zone 5, 230°C in zone 6, and 230°C in zone 7.

[0017] In a preferred embodiment of the present invention, the temperature of the extruder designated E is 210°C in zone one, 235°C in zone two, 235°C in zone three, 235°C in zone four, 235°C in zone five, 235°C in zone six, and 235°C in zone seven.

[0018] In a preferred embodiment of the present invention, the temperature of the extruder designated F is 210°C in zone 1, 230°C in zone 2, 230°C in zone 3, 230°C in zone 4, 230°C in zone 5, 230°C in zone 6, and 230°C in zone 7.

[0019] In a preferred embodiment of the present invention, the temperature of the extruder designated G is 210°C in zone 1, 215°C in zone 2, 215°C in zone 3, 215°C in zone 4, 215°C in zone 5, 215°C in zone 6, and 215°C in zone 7.

[0020] In a preferred embodiment of the present invention, the temperature of the extruder numbered H is 210°C in zone 1, 215°C in zone 2, 215°C in zone 3, 215°C in zone 4, 215°C in zone 5, 215°C in zone 6, and 215°C in zone 7.

[0021] In a preferred embodiment of the present invention, the temperature of the extruder designated as I is 210°C in zone one, 215°C in zone two, 215°C in zone three, 215°C in zone four, 215°C in zone five, 215°C in zone six, and 215°C in zone seven.

[0022] In a preferred embodiment of the present invention, the temperature of the die head is 230°C.

[0023] Compared with the prior art, the beneficial effects of the present invention are: This invention discloses a nine-layer co-extruded high-barrier membrane for liquids. It employs a barrier material as the central E layer, coupled with symmetrical, fully encapsulated adhesive layers on both sides. The interlayer bonding is strong, gap-free, and does not blister or delaminate. Furthermore, the nine-layer simultaneous co-extrusion process achieves molecular-level tight bonding of each functional layer, ensuring uniform thickness at symmetrical positions on both sides. This results in a uniform, continuous, and dense nine-layer co-extruded high-barrier membrane that effectively blocks oxygen and water vapor permeation. The membrane maintains extremely low permeability even under high humidity and long-term storage conditions, meeting the requirements for food and medical applications. The nine-layer co-extruded high-barrier film meets the long-term sealing, preservation, moisture-proofing, and oxidation-proofing requirements of pharmaceuticals and fine chemical products. It can also significantly improve the mechanical properties of the film, making it less prone to cracking, delamination, and damage under complex conditions such as high-speed packaging, vacuum sealing, repeated bending, and low-temperature storage and transportation. This significantly improves its structural stability and service life. Compared with existing five-layer and seven-layer high-barrier films, the nine-layer co-extruded high-barrier film achieves a multi-dimensional synergistic improvement in barrier performance and mechanical properties through a nine-layer symmetrical structure combined with a precise modified formula design. It has extremely high industrial practical value and a wide range of applicable fields. Attached Figure Description

[0024] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the structure of the nine-layer co-extruded high-barrier film of the present invention. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1:

[0028] This embodiment describes a method for preparing a nine-layer co-extruded high-barrier film for liquids, comprising the following steps: Step S1: Weigh the following raw materials according to weight: Layer A: 20 parts high-pressure material, 1 part bentonite, 30 parts polyolefin elastomer, and 50 parts metallocene polyolefin plasmon; Layer B: 20 ​​parts high-pressure material, 30 parts polyolefin elastomer, and 50 parts metallocene polyolefin plasmon; Layer C: 40 parts metallocene polyethylene, 40 parts linear low-density polyethylene, and 20 parts high-pressure material; Prepare Layer D: binder; Prepare Layer E: barrier material. Prepare the F layer raw materials: binder; weigh the G layer raw materials according to weight: 30 parts metallocene polyolefin plasmon, 20 parts polyolefin elastomer, 20 parts high-pressure material, and 30 parts linear low-density polyethylene; weigh the H layer raw materials according to weight: 75 parts metallocene polyethylene, 28 parts polyolefin elastomer, and 2 parts processing aid; weigh the I layer raw materials according to weight: 75 parts metallocene polyethylene, 28 parts polyolefin elastomer, 1 part bentonite, and 2 parts processing aid; the high-pressure material is LDPE. 2426H; the polyolefin elastomer is POE 3020FL; the metallocene polyolefin plastomer is PL 1881G; the metallocene polyethylene is INNATE ST50; the linear low-density polyethylene is LLDPE LL 1001X72; the binder is binder NF529; the barrier material is EVOH F171B; the processing aid is a copolymer of 1,1-difluoroethylene, 1,1,2,3,3,3-hexafluoro-1-propylene and tetrafluoroethylene, CAS number 25190-89-0; Step S2: The raw materials for layers A, B, C, D, E, F, G, H, and I are respectively added to nine different extruders numbered A, B, C, D, E, F, G, H, and I. After melting and extruding into the die, the layers are combined and extruded, blown into a film. Then, a 42-dyne corona treatment is applied to obtain a master roll film. The master roll film is then aged and slit to obtain a nine-layer co-extruded high-barrier film with a thickness of 9 mils. The temperatures of extruder A are 210℃ in zone 1, 215℃ in zone 2, 215℃ in zone 3, 215℃ in zone 4, 215℃ in zone 5, 215℃ in zone 6, and 215℃ in zone 7. Extruder B... The temperatures of zones 1, 2, 3, 4, 5, 6, and 7 of the extruder numbered C are 210℃, 215℃, 215℃, 215℃, 215℃, 215℃, 215℃, and 215℃, respectively. The temperatures of zones 1, 2, 3, 4, 5, 6, and 7 of the extruder numbered D are 210℃, 230℃, 230℃, 230℃, 230℃, 230℃, 230℃, 230℃, and 230℃, respectively. The temperatures of extruder E are as follows: Zone 1: 210℃, Zone 2: 235℃, Zone 3: 235℃, Zone 4: 235℃, Zone 5: 235℃, Zone 6: 235℃, Zone 7: 235℃; Extruder F has the same temperatures in all zones: Zone 1: 210℃, Zone 2: 230℃, Zone 3: 230℃, Zone 4: 230℃, Zone 5: 230℃, Zone 6: 230℃, Zone 7: 230℃; Extruder G has the same temperatures in all zones: Zone 1: 210℃, Zone 2: 215℃, Zone 3: 215℃, Zone 4: 215℃, Zone 5: 215℃, Zone 6: 215℃, Zone 7: 235℃. 15℃; the temperatures of extruder H are 210℃ in zone 1, 215℃ in zone 2, 215℃ in zone 3, 215℃ in zone 4, 215℃ in zone 5, 215℃ in zone 6, and 215℃ in zone 7; the temperatures of extruder I are 210℃ in zone 1, 215℃ in zone 2, 215℃ in zone 3, 215℃ in zone 4, 215℃ in zone 5, 215℃ in zone 6, and 215℃ in zone 7; the die temperature is 230℃; the thickness ratio of layers A, B, C, D, E, F, G, H, and I is 5:7:5:7:5:7:5:7:5, and the nine-layer co-extruded high-barrier film is as follows. Figure 1 As shown.

[0029] Example 2:

[0030] This embodiment describes a method for preparing a nine-layer co-extruded high-barrier film for liquids, comprising the following steps: Step S1: Weigh the following raw materials according to weight: Layer A: 22 parts high-pressure material, 32 parts polyolefin elastomer, 1 part bentonite, and 54 parts metallocene polyolefin plasmon; Weigh the following raw materials according to weight: Layer B: 22 parts high-pressure material, 32 parts polyolefin elastomer, and 54 parts metallocene polyolefin plasmon; Weigh the following raw materials according to weight: Layer C: 42 parts metallocene polyethylene, 42 parts linear low-density polyethylene, and 21 parts high-pressure material; Prepare the following raw materials: Layer D: binder; Prepare the following raw materials: Layer E: barrier material; Prepare... F layer raw material: binder; G layer raw material (weighed by weight): 32 parts metallocene polyolefin plasmon, 21 parts polyolefin elastomer, 22 parts high-pressure material, and 33 parts linear low-density polyethylene; H layer raw material (weighed by weight): 77 parts metallocene polyethylene, 29 parts polyolefin elastomer, and 2.5 parts processing aid; I layer raw material (weighed by weight): 77 parts metallocene polyethylene, 29 parts polyolefin elastomer, 1 part bentonite, and 2.5 parts processing aid; the high-pressure material is LDPE. 2426H; the polyolefin elastomer is POE3020FL; the metallocene polyolefin plastomer is PL 1881G; the metallocene polyethylene is INNATE ST50; the linear low-density polyethylene is LLDPE LL 1001X72; the binder is binder NF529; the barrier material is EVOHF171B; the processing aid is a copolymer of 1,1-difluoroethylene, 1,1,2,3,3,3-hexafluoro-1-propylene and tetrafluoroethylene, CAS number 25190-89-0; Step S2: The raw materials for layers A, B, C, D, E, F, G, H, and I are respectively added to nine different extruders numbered A, B, C, D, E, F, G, H, and I. After melting and extruding into the die, the layers are combined and extruded, blown into a film. Then, after corona treatment with 44 dynes, a master roll film is obtained. The master roll film is then aged and slit to obtain a nine-layer co-extruded high-barrier film with a thickness of 11 mils. The temperatures of extruder A are 210℃ in zone 1, 215℃ in zone 2, 215℃ in zone 3, 215℃ in zone 4, 215℃ in zone 5, 215℃ in zone 6, and 215℃ in zone 7. The extruder B... The temperatures of extruders are as follows: Zone 1: 210℃, Zone 2: 215℃, Zone 3: 215℃, Zone 4: 215℃, Zone 5: 215℃, Zone 6: 215℃, Zone 7: 215℃; Extruder C: Zone 1: 210℃, Zone 2: 215℃, Zone 3: 215℃, Zone 4: 215℃, Zone 5: 215℃, Zone 6: 215℃, Zone 7: 215℃; Extruder D: Zone 1: 210℃, Zone 2: 230℃, Zone 3: 230℃, Zone 4: 230℃, Zone 5: 230℃, Zone 6: 230℃, Zone 7: 230℃; Extruder D: Zone 1: 210℃, Zone 2: 230℃, Zone 3: 230℃, Zone 4: 230℃, Zone 5: 230℃, Zone 6: 230℃, Zone 7: 230℃; The temperatures of extruder E are as follows: Zone 1: 210℃, Zone 2: 235℃, Zone 3: 235℃, Zone 4: 235℃, Zone 5: 235℃, Zone 6: 235℃, Zone 7: 235℃; Extruder F has the same temperatures in all zones: Zone 1: 210℃, Zone 2: 230℃, Zone 3: 230℃, Zone 4: 230℃, Zone 5: 230℃, Zone 6: 230℃, Zone 7: 230℃; Extruder G has the same temperatures in all zones: Zone 1: 210℃, Zone 2: 215℃, Zone 3: 215℃, Zone 4: 215℃, Zone 5: 215℃, Zone 6: 215℃, Zone 7: 235℃. 15℃; the temperatures of extruder H are 210℃ in zone 1, 215℃ in zone 2, 215℃ in zone 3, 215℃ in zone 4, 215℃ in zone 5, 215℃ in zone 6, and 215℃ in zone 7; the temperatures of extruder I are 210℃ in zone 1, 215℃ in zone 2, 215℃ in zone 3, 215℃ in zone 4, 215℃ in zone 5, 215℃ in zone 6, and 215℃ in zone 7; the die temperature is 230℃; the thickness ratio of layers A, B, C, D, E, F, G, H, and I is 5:7:5:7:5:7:5:7:5, and the nine-layer co-extruded high-barrier film is as follows. Figure 1 As shown.

[0031] Example 3:

[0032] This embodiment describes a method for preparing a nine-layer co-extruded high-barrier film for liquids, comprising the following steps: Step S1: Weigh the following raw materials according to weight: Layer A: 24 parts high-pressure material, 35 parts polyolefin elastomer, 1 part bentonite, and 58 parts metallocene polyolefin plasmon; Layer B: 24 parts high-pressure material, 35 parts polyolefin elastomer, and 58 parts metallocene polyolefin plasmon; Layer C: 45 parts metallocene polyethylene, 45 parts linear low-density polyethylene, and 22 parts high-pressure material; Prepare Layer D: binder; Prepare Layer E: barrier material. Prepare the F layer raw materials: binder; weigh the G layer raw materials according to weight: 34 parts metallocene polyolefin plasmon, 22 parts polyolefin elastomer, 24 parts high-pressure material, and 36 parts linear low-density polyethylene; weigh the H layer raw materials according to weight: 79 parts metallocene polyethylene, 30 parts polyolefin elastomer, and 3 parts processing aid; weigh the I layer raw materials according to weight: 79 parts metallocene polyethylene, 30 parts polyolefin elastomer, 1 part bentonite, and 3 parts processing aid; the high-pressure material is LDPE. 2426H; the polyolefin elastomer is POE 3020FL; the metallocene polyolefin plastomer is PL 1881G; the metallocene polyethylene is INNATE ST50; the linear low-density polyethylene is LLDPE LL 1001X72; the binder is binder NF529; the barrier material is EVOH F171B; the processing aid is a copolymer of 1,1-difluoroethylene, 1,1,2,3,3,3-hexafluoro-1-propylene and tetrafluoroethylene, CAS number 25190-89-0; Step S2: The raw materials for layers A, B, C, D, E, F, G, H, and I are respectively added to nine different extruders numbered A, B, C, D, E, F, G, H, and I. After melting and extruding into the die, the layers are combined and extruded, blown into a film. Then, after corona treatment with 46 dynes, a master roll film is obtained. The master roll film is then aged and slit to obtain a nine-layer co-extruded high-barrier film with a thickness of 12 mils. The temperatures of extruder A are 210℃ in zones 1, 215℃ in zones 2, 3, 4, 5, 6, and 7; the temperatures of extruder B are... The temperatures of extruders are as follows: Zone 1: 210℃, Zone 2: 215℃, Zone 3: 215℃, Zone 4: 215℃, Zone 5: 215℃, Zone 6: 215℃, Zone 7: 215℃; Extruder C: Zone 1: 210℃, Zone 2: 215℃, Zone 3: 215℃, Zone 4: 215℃, Zone 5: 215℃, Zone 6: 215℃, Zone 7: 215℃; Extruder D: Zone 1: 210℃, Zone 2: 230℃, Zone 3: 230℃, Zone 4: 230℃, Zone 5: 230℃, Zone 6: 230℃, Zone 7: 230℃; Extruder D: Zone 1: 210℃, Zone 2: 230℃, Zone 3: 230℃, Zone 4: 230℃, Zone 5: 230℃, Zone 6: 230℃, Zone 7: 230℃; The temperatures of extruder E are as follows: Zone 1: 210℃, Zone 2: 235℃, Zone 3: 235℃, Zone 4: 235℃, Zone 5: 235℃, Zone 6: 235℃, Zone 7: 235℃; Extruder F has the same temperatures in all zones: Zone 1: 210℃, Zone 2: 230℃, Zone 3: 230℃, Zone 4: 230℃, Zone 5: 230℃, Zone 6: 230℃, Zone 7: 230℃; Extruder G has the same temperatures in all zones: Zone 1: 210℃, Zone 2: 215℃, Zone 3: 215℃, Zone 4: 215℃, Zone 5: 215℃, Zone 6: 215℃, Zone 7: 235℃. 15℃; the temperatures of extruder H are 210℃ in zone 1, 215℃ in zone 2, 215℃ in zone 3, 215℃ in zone 4, 215℃ in zone 5, 215℃ in zone 6, and 215℃ in zone 7; the temperatures of extruder I are 210℃ in zone 1, 215℃ in zone 2, 215℃ in zone 3, 215℃ in zone 4, 215℃ in zone 5, 215℃ in zone 6, and 215℃ in zone 7; the die temperature is 230℃; the thickness ratio of layers A, B, C, D, E, F, G, H, and I is 5:7:5:7:5:7:5:7:5, and the nine-layer co-extruded high-barrier film is as follows. Figure 1 As shown.

[0033] Performance testing The performance of the nine-layer co-extruded high-barrier films of Examples 1-3 was tested according to GB / T 8809-2015 for pendulum impact resistance, GB / T 1040.3-2006 for tensile strength (transverse), GB / T 9639.1-2008 for dart impact breaking mass, GB / T 26253-2010 for water vapor transmission, and GB / T 19789-2021 for oxygen transmission.

[0034] The test results are shown in the table below:

[0035] Referring to the data in the table above, based on the data from Examples 1-3, it can be seen that the nine-layer co-extruded high-barrier film of this application has high resistance to pendulum impact energy, tensile strength, and dart impact damage quality, and has low water vapor permeability and oxygen permeability, which makes the nine-layer co-extruded high-barrier film of this application have excellent mechanical properties and barrier properties.

[0036] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0037] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in this application, they should all fall within the protection scope of the present invention.

Claims

1. A nine-layer co-extruded high-barrier film for liquids, characterized in that, It includes a nine-layer structure, from top to bottom: layer A, layer B, layer C, layer D, layer E, layer F, layer G, layer H, and layer I; Layer A is a printable functional layer, and the printable functional layer comprises the following raw materials in parts by weight: 20-24 parts high-pressure material, 30-35 parts polyolefin elastomer, 1 part bentonite, and 50-58 parts metallocene polyolefin plasmon. Layer B is an outer buffer blend layer, which comprises the following raw materials in parts by weight: 20-24 parts of high-pressure material, 30-35 parts of polyolefin elastomer, and 50-58 parts of metallocene polyolefin plasmid; The C layer is an outer transition blend layer, and the outer transition blend layer comprises the following raw materials in parts by weight: 40-45 parts of metallocene polyethylene, 40-45 parts of linear low-density polyethylene, and 20-22 parts of high-pressure compound; The D layer is an upper adhesive layer, and the raw material of the upper adhesive layer is an adhesive. The E layer is a high-barrier layer, and the raw material of the high-barrier layer is a barrier material; The F layer is a lower adhesive layer, and the raw material of the lower adhesive layer is an adhesive. The G layer is an inner transition blend layer, and the inner transition blend layer comprises the following raw materials in parts by weight: 30-34 parts of metallocene polyolefin plasmon, 20-22 parts of polyolefin elastomer, 20-24 parts of high-pressure material, and 30-36 parts of linear low-density polyethylene. The H layer is an inner heat-sealing functional layer, and the inner heat-sealing functional layer comprises the following raw materials in parts by weight: 75-79 parts of metallocene polyethylene, 28-30 parts of polyolefin elastomer, and 2-3 parts of processing aids; The innermost heat-sealing functional layer (layer I) comprises the following raw materials in parts by weight: The composition includes 75-79 parts of metallocene polyethylene, 28-30 parts of polyolefin elastomer, 1 part of bentonite, and 2-3 parts of processing aids.

2. The nine-layer co-extruded high-barrier film for liquids according to claim 1, characterized in that, The thickness of the nine-layer co-extruded high-barrier film is 90-120 μm.

3. The nine-layer co-extruded high-barrier film for liquids according to claim 1, characterized in that, The thickness ratio of the A, B, C, D, E, F, G, H and I layers is 5:7:5:7:5:7:5:7:

5.

4. The nine-layer co-extruded high-barrier film for liquids according to claim 1, characterized in that, The high-pressure material is LDPE 2426H; the polyolefin elastomer is POE 3020FL.

5. The nine-layer co-extruded high-barrier film for liquids according to claim 1, characterized in that, The metallocene polyolefin plastomer is PL 1881G; the metallocene polyethylene is INNATE ST50.

6. The nine-layer co-extruded high-barrier film for liquids according to claim 1, characterized in that, The linear low-density polyethylene is LLDPE LL 1001X72; the binder is binder NF529.

7. The nine-layer co-extruded high-barrier film for liquids according to claim 1, characterized in that, The barrier material is EVOH F171B; the processing aid is a copolymer of 1,1-difluoroethylene, 1,1,2,3,3,3-hexafluoro-1-propylene and tetrafluoroethylene, with CAS number 25190-89-0.

8. The nine-layer co-extruded high-barrier film for liquids according to claim 1, characterized in that, The nine-layer co-extruded high-barrier film is prepared by the following steps: The raw materials for layers A, B, C, D, E, F, G, H, and I are respectively added to nine different extruders numbered A, B, C, D, E, F, G, H, and I. After being melted and extruded into the die, they are combined and extruded, blown into a film, and then subjected to corona treatment with 42-46 dynes to obtain a master roll film. After aging treatment, the master roll film is slit to obtain a nine-layer co-extruded high-barrier film with a thickness of 9-12 mils.

9. A nine-layer co-extruded high-barrier film for liquids according to claim 8, characterized in that, The temperature of zone 1 of extruder A is 210℃, zone 2 is 215℃, zone 3 is 215℃, zone 4 is 215℃, zone 5 is 215℃, zone 6 is 215℃, and zone 7 is 215℃. The temperature of zone 1 of extruder B is 210℃, zone 2 is 215℃, zone 3 is 215℃, zone 4 is 215℃, zone 5 is 215℃, zone 6 is 215℃, and zone 7 is 215℃. The temperature of zone 1 of extruder C is 210℃, zone 2 is 215℃, zone 3 is 215℃, zone 4 is 215℃, zone 5 is 215℃, zone 6 is 215℃, and zone 7 is 215℃. The temperature of zone 1 of extruder D is 210℃, zone 2 is 230℃, zone 3 is 230℃, zone 4 is 230℃, zone 5 is 230℃, zone 6 is 230℃, and zone 7 is 230℃. The temperature of the extruder numbered E is 210℃ in zone 1, 235℃ in zone 2, 235℃ in zone 3, 235℃ in zone 4, 235℃ in zone 5, 235℃ in zone 6, and 235℃ in zone 7. The temperature of the extruder numbered F is 210℃ in zone 1, 230℃ in zone 2, 230℃ in zone 3, 230℃ in zone 4, 230℃ in zone 5, 230℃ in zone 6, and 230℃ in zone 7. The temperature of zone 1 of the extruder numbered G is 210℃, zone 2 is 215℃, zone 3 is 215℃, zone 4 is 215℃, zone 5 is 215℃, zone 6 is 215℃, and zone 7 is 215℃. The temperature of zone 1 of the extruder numbered H is 210℃, zone 2 is 215℃, zone 3 is 215℃, zone 4 is 215℃, zone 5 is 215℃, zone 6 is 215℃, and zone 7 is 215℃. The temperature of zone 1 of extruder number I is 210℃, zone 2 is 215℃, zone 3 is 215℃, zone 4 is 215℃, zone 5 is 215℃, zone 6 is 215℃, and zone 7 is 215℃. The temperature of the die head is 230℃.

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