High-temperature-resistant high-barrier composite film and preparation method thereof

Abstract

The invention discloses a high-temperature-resistant high-barrier composite film and a preparation method thereof, and relates to the technical field of layered products, the high-temperature-resistant high-barrier composite film sequentially comprises a layer A, a layer B and a layer C; the layer A sequentially comprises a temperature-resistant layer, a base material layer and a barrier layer; the layer B sequentially comprises a base material layer, a connecting layer, a blocking layer, an aluminum plating layer and a protective layer; the C layer is a heat sealing layer; the temperature-resistant layer material is prepared from the following raw materials: aluminum oxide and titanium nitride; the barrier layer material is prepared from the following raw materials: an ethylene-vinyl alcohol copolymer, succinamic acid, fluniic acid and a carbon nano tube; the heat sealing layer material is prepared from titanium carbide, high-density polyethylene, metallocene polyethylene and zinc stearate. The high-temperature-resistant high-barrier composite film provided by the invention is excellent in high temperature resistance and barrier property.

Description

Technical Field

[0001] The present invention relates to the technical field of layered products, and in particular to a high-temperature resistant and high-barrier composite film and a preparation method thereof. Background Art

[0002] Composite films are used in the packaging industry, depending on the different properties of the application. Such composite films are generally multilayer plastic films, produced by extrusion, coextrusion or lamination (single layers are bonded together with a laminating adhesive) or a mixture thereof. Layers that are not composed of plastic, such as layers made of aluminum or paper, can also be integrated into the composite film. Composite films also generally have an outer sealing layer to process the composite film into desired packaging, such as sachets, bags, bags, etc., by heat sealing. CN110582399A discloses a recyclable, easily tearable packaging laminate with good barrier effect and a method for producing the same, but the high temperature resistance and barrier properties of the packaging laminate are not excellent enough.

[0003] In summary, after extensive searches by the applicant, it has been found that at least the existing composite films in this field have insufficient high temperature resistance and barrier properties. Therefore, it is necessary to develop or improve a high temperature resistant and high barrier composite film and its preparation method. Summary of the Invention

[0004] Based on this, in order to solve the problem that the high temperature resistance and barrier properties of existing composite films are not good enough, the present invention provides a high temperature resistant and high barrier composite film and a preparation method thereof. The specific technical solution is as follows: A high-temperature resistant and high-barrier composite film, which comprises layer A, layer B and layer C in sequence; The A layer includes a temperature-resistant layer, a substrate layer and a barrier layer in sequence; The B layer includes a substrate layer, a connecting layer, a barrier layer, an aluminum coating layer and a protective layer in sequence; The C layer is a heat sealing layer; The heat-resistant layer is made of heat-resistant layer materials, and the raw materials for preparing the heat-resistant layer materials include aluminum oxide and titanium nitride; The barrier layer is prepared by using a barrier layer material, and the raw materials for preparing the barrier layer include ethylene-vinyl alcohol copolymer, succinamic acid, fluonic acid and carbon nanotubes; The heat sealing layer is prepared by using heat sealing layer materials, and the raw materials for preparing the heat sealing layer include titanium carbide, high-density polyethylene, metallocene polyethylene and zinc stearate; The barrier layer of layer A is bonded to the protective layer of layer B, and the base material layer of layer B is bonded to the heat-sealing layer of layer C.

[0005] Furthermore, the substrate layer is prepared from a substrate layer material comprising 35-55% high-density polyethylene and 45-65% low-density polyethylene in terms of mass ratio.

[0006] Furthermore, the connecting layer is prepared using a connecting layer material, and the connecting layer material includes at least one of maleic anhydride-ethylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer and ethylene-butyl acrylate copolymer.

[0007] Furthermore, in terms of mass ratio, the aluminum plating layer is prepared using an aluminum plating layer material, the aluminum plating layer material includes 3-7% aluminum oxide and 97-93% polyethylene, and the material of the protective layer is polyurethane.

[0008] Furthermore, the preparation method of the temperature-resistant layer material comprises the following steps: The aluminum oxide and the titanium nitride are added to water, stirred at a speed of 1000-1200 r / min for 2-3 hours, and then ultrasonicated at a frequency of 80-120 kHz for 1.3-1.7 hours to obtain the temperature-resistant layer material; The mass ratio of the aluminum oxide, titanium nitride and water is 10-20:3-7:75-85.

[0009] Furthermore, the preparation method of the barrier layer material comprises the following steps: The ethylene-vinyl alcohol copolymer is added to n-propanol and stirred at a speed of 800-900 r / min, then succinamic acid, fluonic acid and water are added, and stirred at a speed of 1100-1300 r / min for 3.1-3.5 hours, and then carbon nanotubes are added, and ultrasonication is performed at a frequency of 80-120 kHz for 1.9-2.3 hours, and then the temperature is raised to 85-95° C. and reacted for 2.5-2.9 hours, and then cooled to room temperature and dried at 100-110° C. to obtain the barrier layer material; The mass ratio of the ethylene-vinyl alcohol copolymer, succinamic acid, fluonic acid, carbon nanotubes, n-propanol and water is 60-70:3-7:10-20:1-3:71-76:10-15.

[0010] Furthermore, the preparation method of the heat-sealing layer material comprises the following steps: The high-density polyethylene and the metallocene polyethylene are heated to a molten state, and then titanium carbide and zinc stearate are added, mixed evenly, and then co-extruded to obtain the heat-sealing layer material; The mass ratio of the titanium carbide, high-density polyethylene, metallocene polyethylene and zinc stearate is 3-7:55-65:35-45:1.1-1.6.

[0011] Furthermore, in layer B, the thickness of the substrate layer is 45-55% of the total thickness of layer B, the thickness of the connecting layer is 10-15% of the total thickness of layer B, the thickness of the barrier layer is 10-15% of the total thickness of layer B, the thickness of the aluminum plating layer is 10-15% of the total thickness of layer B, and the thickness of the protective layer is 10-15% of the total thickness of layer B; In layer A, the thickness of the heat-resistant layer is 20-30% of the total thickness of layer A, the thickness of the substrate layer is 45-55% of the total thickness of layer A, and the thickness of the barrier layer is 20-30% of the total thickness of layer A.

[0012] In addition, the present invention also provides a method for preparing a high-temperature resistant and high-barrier composite film, comprising the following steps: The substrate layer material, the connecting layer material, the barrier layer material, the aluminized layer material and the protective layer material are sequentially added into a five-layer co-extrusion blown film line to obtain a B layer including the substrate layer, the connecting layer, the barrier layer, the aluminized layer and the protective layer; The substrate layer material and the barrier layer material are sequentially added into a two-layer co-extrusion blown film line to obtain a layer A precursor comprising a substrate layer and a barrier layer, and the heat-resistant layer material is coated or sprayed on the outer surface of the substrate layer of the layer A precursor to obtain the A layer; Bonding the layer A, layer B, and layer C using a polyimide adhesive to obtain the high-temperature resistant and high-barrier composite film; The barrier layer of layer A is bonded to the protective layer of layer B, and the base material layer of layer B is bonded to the heat-sealing layer of layer C.

[0013] Furthermore, the thickness ratio of the A layer, the B layer, and the C layer is 10-15:20-25:5-10, and the total thickness of the high-temperature resistant and high-barrier composite film is 15-65 μm.

[0014] The high temperature resistant and high barrier composite film provided by the above technical solution comprises an A layer which comprises a heat resistant layer, a substrate layer and a barrier layer in sequence, a B layer which comprises a substrate layer, a connecting layer, a barrier layer, an aluminum plating layer and a protective layer in sequence, and a C layer which comprises a heat sealing layer, and the raw materials for preparing the heat resistant layer material comprise aluminum oxide and titanium nitride, the raw materials for preparing the barrier layer material comprise ethylene-vinyl alcohol copolymer, succinic acid, fluonic acid and carbon nanotubes, and the raw materials for preparing the heat sealing layer material comprise titanium carbide, high density polyethylene, metallocene polyethylene and stearic acid. Zinc acid, which has excellent high-temperature resistance and barrier properties; specifically, the excellent tensile properties and barrier properties of carbon nanotubes themselves, the barrier properties of fluorine in fluonic acid and the multi-functional groups of succinamide acid undergo mutual cross-linking. The barrier layer material modified with fluonic acid and carbon nanotubes can not only provide excellent tensile strength, but also has high-temperature cooking stability and high barrier properties to water vapor and oxygen. The heat-resistant layer modified with titanium nitride and the heat-sealing layer modified with titanium carbide can provide strong high-temperature stability and maintain high barrier properties at high temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of a high temperature resistant and high barrier composite film.

[0016] Description of reference numerals: 1. Base material layer; 2. Connecting layer; 3. Barrier layer; 4. Aluminum coating layer; 5. Protective layer; 6. Heat-resistant layer; 7. Heat-sealing layer. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with its embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not limit the scope of protection of the present invention.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by one skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0019] A high-temperature resistant and high-barrier composite film in one embodiment of the present invention comprises layer A, layer B, and layer C in sequence; The A layer includes a heat-resistant layer 6, a substrate layer 1 and a barrier layer 3 in sequence; The B layer includes a substrate layer 1, a connecting layer 2, a barrier layer 3, an aluminum coating layer 4 and a protective layer 5 in sequence; The C layer is a heat sealing layer 7; The raw materials for preparing the heat-resistant layer 6 include aluminum oxide and titanium nitride; The raw materials for preparing the barrier layer 3 include ethylene-vinyl alcohol copolymer, succinamic acid, fluonic acid and carbon nanotubes; The raw materials for preparing the heat sealing layer 7 include titanium carbide, high-density polyethylene, metallocene polyethylene and zinc stearate; The barrier layer 3 in the A layer is bonded to the protective layer 5 in the B layer, and the base material layer 1 in the B layer is bonded to the heat-sealing layer 7 in the C layer.

[0020] In one embodiment, the substrate layer 1 is prepared using a substrate layer material comprising 35-55% high-density polyethylene and 45-65% low-density polyethylene in terms of mass ratio.

[0021] In one embodiment, the connecting layer 2 is prepared by a connecting layer material, and the connecting layer material includes at least one of maleic anhydride-ethylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer and ethylene-butyl acrylate copolymer.

[0022] In one embodiment, the aluminum plating layer 4 is prepared by an aluminum plating layer material, and the aluminum plating layer material includes 3-7% aluminum oxide and 97-93% polyethylene. The protective layer 5 is prepared by a protective layer material, and the protective layer material is polyurethane.

[0023] In one embodiment, the temperature-resistant layer 6 is prepared using a temperature-resistant layer material, and the preparation method of the temperature-resistant layer material includes the following steps: The aluminum oxide and the titanium nitride are added to water, stirred at a speed of 1000-1200 r / min for 2-3 hours, and then ultrasonicated at a frequency of 80-120 kHz for 1.3-1.7 hours to obtain the temperature-resistant layer material; The mass ratio of the aluminum oxide, titanium nitride and water is 10-20:3-7:75-85.

[0024] In one embodiment, the barrier layer 3 is prepared using a barrier layer material, and the preparation method of the barrier layer material includes the following steps: The ethylene-vinyl alcohol copolymer is added to n-propanol and stirred at a speed of 800-900 r / min, then succinamic acid, fluonic acid and water are added, and stirred at a speed of 1100-1300 r / min for 3.1-3.5 hours, and then carbon nanotubes are added, and ultrasonication is performed at a frequency of 80-120 kHz for 1.9-2.3 hours, and then the temperature is raised to 85-95° C. and reacted for 2.5-2.9 hours, and then cooled to room temperature and dried at 100-110° C. to obtain the barrier layer material; The mass ratio of the ethylene-vinyl alcohol copolymer, succinamic acid, fluonic acid, carbon nanotubes, n-propanol and water is 60-70:3-7:10-20:1-3:71-76:10-15.

[0025] In one embodiment, the heat sealing layer 7 is prepared using a heat sealing layer material, and the preparation method of the heat sealing layer material includes the following steps: The high-density polyethylene and the metallocene polyethylene are heated to a molten state, and then titanium carbide and zinc stearate are added, mixed evenly, and then co-extruded to obtain the heat-sealing layer material; The mass ratio of the titanium carbide, high-density polyethylene, metallocene polyethylene and zinc stearate is 3-7:55-65:35-45:1.1-1.6.

[0026] In one embodiment, in layer B, the thickness of the base material layer 1 is 45-55% of the total thickness of layer B, the thickness of the connecting layer 2 is 10-15% of the total thickness of layer B, the thickness of the barrier layer 3 is 10-15% of the total thickness of layer B, the thickness of the aluminum plating layer 4 is 10-15% of the total thickness of layer B, and the thickness of the protective layer 5 is 10-15% of the total thickness of layer B; In layer A, the thickness of the heat-resistant layer 6 is 20-30% of the total thickness of layer A, the thickness of the substrate layer 1 is 45-55% of the total thickness of layer A, and the thickness of the barrier layer 3 is 20-30% of the total thickness of layer A.

[0027] In one embodiment, the present technical solution provides a method for preparing a high-temperature resistant and high-barrier composite film, which comprises the following steps: The substrate layer material, the connecting layer material, the barrier layer material, the aluminized layer material and the protective layer material are sequentially added to a five-layer co-extrusion blown film line to obtain a B layer including a substrate layer 1, a connecting layer 2, a barrier layer 3, an aluminized layer 4 and a protective layer 5; The substrate layer material and the barrier layer material are sequentially added to a two-layer co-extrusion blown film line to obtain a layer A precursor comprising a substrate layer 1 and a barrier layer 3, and the heat-resistant layer material is coated or sprayed on the outer surface of the substrate layer 1 of the layer A precursor to obtain the A layer; Bonding the layer A, layer B, and layer C using a polyimide adhesive to obtain the high-temperature resistant and high-barrier composite film; The barrier layer 3 of the A layer is bonded to the protective layer 5 of the B layer, and the base material layer 1 of the B layer is bonded to the heat-sealing layer 7 of the C layer.

[0028] In one embodiment, the thickness ratio of the layer A, layer B and layer C is 10-15:20-25:5-10, and the total thickness of the high temperature resistant and high barrier composite film is 15-65 μm.

[0029] The embodiments of the present invention will be described in detail below with reference to specific examples.

[0030] Example 1: Preparation of the heat-resistant layer material: 15 parts of aluminum oxide and 5 parts of titanium nitride were added to 80 parts of water, stirred at 1100 r / min for 2.5 hours, and then ultrasonicated at a frequency of 100 kHz for 1.5 hours to obtain the heat-resistant layer material; Preparation of the barrier layer material: 65 parts of ethylene-vinyl alcohol copolymer were added to 73 parts of n-propanol by mass, and stirred at 850 r / min. Then, 5 parts of succinamic acid, 15 parts of fluonic acid, and 13 parts of water were added, and stirred at 1200 r / min for 3.3 hours. Then, 2 parts of carbon nanotubes were added, and the mixture was ultrasonically treated at a frequency of 100 kHz for 2.2 hours. The temperature was then raised to 90°C and reacted for 2.7 hours. The mixture was then cooled to room temperature and dried at 105°C to obtain the barrier layer material. Preparation of heat seal material: Heat 60 parts by mass of high-density polyethylene and 40 parts by mass of metallocene polyethylene until molten, then add 5 parts of titanium carbide and 1.3 parts of zinc stearate, mix well, and co-extrude to obtain a heat seal material; By mass ratio, the base material comprises 45% high-density polyethylene and 55% low-density polyethylene, the aluminized layer comprises 5% alumina and 95% polyethylene, the connecting layer is ethylene-butyl acrylate copolymer, and the protective layer is polyurethane. Preparation of high temperature resistant and high barrier composite film: the above-mentioned substrate layer material, connecting layer material, barrier layer material, aluminized layer material and protective layer material are sequentially added to a five-layer co-extrusion blown film line to obtain layer B, and in layer B, the layer thickness ratio of substrate layer 1, connecting layer 2, barrier layer 3, aluminized layer 4 and protective layer 5 is 50:10:15:10:15; the substrate layer material and barrier layer material are sequentially added to a two-layer co-extrusion blown film line to obtain layer A including substrate layer 1 and barrier layer 3 Precursor, a heat-resistant layer material is coated on the outer surface of the substrate layer 1 of the A layer precursor to obtain an A layer, and in the A layer, the layer thickness ratio of the heat-resistant layer 6, the substrate layer 1 and the barrier layer 3 is 25:50:25; the C layer is obtained by co-extrusion of the heat-sealing layer material; the A layer, the B layer and the C layer are bonded in sequence using a polyimide adhesive to obtain a high-temperature resistant and high-barrier composite film, wherein the ratio of the A layer, the B layer and the C layer is 15:25:10, and the total thickness of the high-temperature resistant and high-barrier composite film is 40 μm.

[0031] Example 2: Preparation of the heat-resistant layer material: 15 parts of aluminum oxide and 5 parts of titanium nitride were added to 80 parts of water, stirred at 1100 r / min for 2.5 hours, and then ultrasonicated at a frequency of 100 kHz for 1.5 hours to obtain the heat-resistant layer material; Preparation of the barrier layer material: 65 parts of ethylene-vinyl alcohol copolymer were added to 73 parts of n-propanol by mass, and stirred at 850 r / min. Then, 5 parts of succinamic acid, 20 parts of fluonic acid and 13 parts of water were added, and stirred at 1200 r / min for 3.3 hours. Then, 2 parts of carbon nanotubes were added, and the mixture was ultrasonically treated at a frequency of 100 kHz for 2.2 hours. The temperature was then raised to 90°C and reacted for 2.7 hours. The mixture was then cooled to room temperature and dried at 105°C to obtain the barrier layer material. Preparation of heat seal material: Heat 60 parts by mass of high-density polyethylene and 40 parts by mass of metallocene polyethylene until molten, then add 5 parts of titanium carbide and 1.3 parts of zinc stearate, mix well, and co-extrude to obtain a heat seal material; By mass ratio, the base material comprises 45% high-density polyethylene and 55% low-density polyethylene, the aluminized layer comprises 5% alumina and 95% polyethylene, the connecting layer is ethylene-butyl acrylate copolymer, and the protective layer is polyurethane. Preparation of high temperature resistant and high barrier composite film: the above-mentioned substrate layer material, connecting layer material, barrier layer material, aluminized layer material and protective layer material are sequentially added to a five-layer co-extrusion blown film line to obtain layer B, and in layer B, the layer thickness ratio of substrate layer 1, connecting layer 2, barrier layer 3, aluminized layer 4 and protective layer 5 is 50:10:15:10:15; the substrate layer material and barrier layer material are sequentially added to a two-layer co-extrusion blown film line to obtain layer A including substrate layer 1 and barrier layer 3 Precursor, a heat-resistant layer material is coated on the outer surface of the substrate layer 1 of the A layer precursor to obtain an A layer, and in the A layer, the layer thickness ratio of the heat-resistant layer 6, the substrate layer 1 and the barrier layer 3 is 25:50:25; the C layer is obtained by co-extrusion of the heat-sealing layer material; the A layer, the B layer and the C layer are bonded in sequence using a polyimide adhesive to obtain a high-temperature resistant and high-barrier composite film, wherein the ratio of the A layer, the B layer and the C layer is 15:25:10, and the total thickness of the high-temperature resistant and high-barrier composite film is 40 μm.

[0032] Example 3: Preparation of the heat-resistant layer material: 15 parts of aluminum oxide and 5 parts of titanium nitride were added to 80 parts of water, stirred at 1100 r / min for 2.5 hours, and then ultrasonicated at a frequency of 100 kHz for 1.5 hours to obtain the heat-resistant layer material; Preparation of the barrier layer material: 65 parts of ethylene-vinyl alcohol copolymer were added to 73 parts of n-propanol by mass, and stirred at 850 r / min. Then, 5 parts of succinamic acid, 10 parts of fluonic acid, and 13 parts of water were added, and stirred at 1200 r / min for 3.3 hours. Then, 2 parts of carbon nanotubes were added, and the mixture was ultrasonically treated at a frequency of 100 kHz for 2.2 hours. The temperature was then raised to 90°C and reacted for 2.7 hours. The mixture was then cooled to room temperature and dried at 105°C to obtain the barrier layer material. Preparation of heat seal material: Heat 60 parts by mass of high-density polyethylene and 40 parts by mass of metallocene polyethylene until molten, then add 5 parts of titanium carbide and 1.3 parts of zinc stearate, mix well, and co-extrude to obtain a heat seal material; By mass ratio, the base material comprises 45% high-density polyethylene and 55% low-density polyethylene, the aluminized layer comprises 5% alumina and 95% polyethylene, the connecting layer is ethylene-butyl acrylate copolymer, and the protective layer is polyurethane. Preparation of high temperature resistant and high barrier composite film: the above-mentioned substrate layer material, connecting layer material, barrier layer material, aluminized layer material and protective layer material are sequentially added to a five-layer co-extrusion blown film line to obtain layer B, and in layer B, the layer thickness ratio of substrate layer 1, connecting layer 2, barrier layer 3, aluminized layer 4 and protective layer 5 is 50:10:15:10:15; the substrate layer material and barrier layer material are sequentially added to a two-layer co-extrusion blown film line to obtain layer A including substrate layer 1 and barrier layer 3 Precursor, a heat-resistant layer material is coated on the outer surface of the substrate layer 1 of the A layer precursor to obtain an A layer, and in the A layer, the layer thickness ratio of the heat-resistant layer 6, the substrate layer 1 and the barrier layer 3 is 25:50:25; the C layer is obtained by co-extrusion of the heat-sealing layer material; the A layer, the B layer and the C layer are bonded in sequence using a polyimide adhesive to obtain a high-temperature resistant and high-barrier composite film, wherein the ratio of the A layer, the B layer and the C layer is 15:25:10, and the total thickness of the high-temperature resistant and high-barrier composite film is 40 μm.

[0033] Example 4: Preparation of the heat-resistant layer material: 15 parts of aluminum oxide and 5 parts of titanium nitride were added to 80 parts of water, stirred at 1100 r / min for 2.5 hours, and then ultrasonicated at a frequency of 100 kHz for 1.5 hours to obtain the heat-resistant layer material; Preparation of the barrier layer material: 65 parts of ethylene-vinyl alcohol copolymer were added to 73 parts of n-propanol by mass, and stirred at 850 r / min. Then, 5 parts of succinamic acid, 15 parts of fluonic acid, and 13 parts of water were added, and stirred at 1200 r / min for 3.3 hours. Then, 3 parts of carbon nanotubes were added, and the mixture was ultrasonically treated at a frequency of 100 kHz for 2.2 hours. The temperature was then raised to 90°C and reacted for 2.7 hours. The mixture was then cooled to room temperature and dried at 105°C to obtain the barrier layer material. Preparation of heat seal material: Heat 60 parts by mass of high-density polyethylene and 40 parts by mass of metallocene polyethylene until molten, then add 5 parts of titanium carbide and 1.3 parts of zinc stearate, mix well, and co-extrude to obtain a heat seal material; By mass ratio, the base material comprises 45% high-density polyethylene and 55% low-density polyethylene, the aluminized layer comprises 5% alumina and 95% polyethylene, the connecting layer is ethylene-butyl acrylate copolymer, and the protective layer is polyurethane. Preparation of high temperature resistant and high barrier composite film: the above-mentioned substrate layer material, connecting layer material, barrier layer material, aluminized layer material and protective layer material are sequentially added to a five-layer co-extrusion blown film line to obtain layer B, and in layer B, the layer thickness ratio of substrate layer 1, connecting layer 2, barrier layer 3, aluminized layer 4 and protective layer 5 is 50:10:15:10:15; the substrate layer material and barrier layer material are sequentially added to a two-layer co-extrusion blown film line to obtain layer A including substrate layer 1 and barrier layer 3 Precursor, a heat-resistant layer material is coated on the outer surface of the substrate layer 1 of the A layer precursor to obtain an A layer, and in the A layer, the layer thickness ratio of the heat-resistant layer 6, the substrate layer 1 and the barrier layer 3 is 25:50:25; the C layer is obtained by co-extrusion of the heat-sealing layer material; the A layer, the B layer and the C layer are bonded in sequence using a polyimide adhesive to obtain a high-temperature resistant and high-barrier composite film, wherein the ratio of the A layer, the B layer and the C layer is 15:25:10, and the total thickness of the high-temperature resistant and high-barrier composite film is 40 μm.

[0034] Example 5: Preparation of the heat-resistant layer material: 15 parts of aluminum oxide and 5 parts of titanium nitride were added to 80 parts of water, stirred at 1100 r / min for 2.5 hours, and then ultrasonicated at a frequency of 100 kHz for 1.5 hours to obtain the heat-resistant layer material; Preparation of the barrier layer material: 65 parts of ethylene-vinyl alcohol copolymer were added to 73 parts of n-propanol by mass, and stirred at 850 r / min. Then, 5 parts of succinamic acid, 15 parts of fluonic acid, and 13 parts of water were added, and stirred at 1200 r / min for 3.3 hours. Then, 1 part of carbon nanotubes was added, and the mixture was ultrasonicated at a frequency of 100 kHz for 2.2 hours. Then, the temperature was raised to 90°C and reacted for 2.7 hours. Then, the mixture was cooled to room temperature and dried at 105°C to obtain the barrier layer material. Preparation of heat seal material: Heat 60 parts by mass of high-density polyethylene and 40 parts by mass of metallocene polyethylene until molten, then add 5 parts of titanium carbide and 1.3 parts of zinc stearate, mix well, and co-extrude to obtain a heat seal material; By mass ratio, the base material comprises 45% high-density polyethylene and 55% low-density polyethylene, the aluminized layer comprises 5% alumina and 95% polyethylene, the connecting layer is ethylene-butyl acrylate copolymer, and the protective layer is polyurethane. Preparation of high temperature resistant and high barrier composite film: the above-mentioned substrate layer material, connecting layer material, barrier layer material, aluminized layer material and protective layer material are sequentially added to a five-layer co-extrusion blown film line to obtain layer B, and in layer B, the layer thickness ratio of substrate layer 1, connecting layer 2, barrier layer 3, aluminized layer 4 and protective layer 5 is 50:10:15:10:15; the substrate layer material and barrier layer material are sequentially added to a two-layer co-extrusion blown film line to obtain layer A including substrate layer 1 and barrier layer 3 Precursor, a heat-resistant layer material is coated on the outer surface of the substrate layer 1 of the A layer precursor to obtain an A layer, and in the A layer, the layer thickness ratio of the heat-resistant layer 6, the substrate layer 1 and the barrier layer 3 is 25:50:25; the C layer is obtained by co-extrusion of the heat-sealing layer material; the A layer, the B layer and the C layer are bonded in sequence using a polyimide adhesive to obtain a high-temperature resistant and high-barrier composite film, wherein the ratio of the A layer, the B layer and the C layer is 15:25:10, and the total thickness of the high-temperature resistant and high-barrier composite film is 40 μm.

[0035] In order to further illustrate the present application, the following comparative examples 1 to 6 are prepared. However, the purpose of the comparative examples is to prepare comparative samples. The numbers of the detailed contents in the comparative examples are not repeated here.

[0036] Comparative Example 1: Preparation of the heat-resistant layer material: 15 parts of aluminum oxide and 5 parts of titanium nitride were added to 80 parts of water, stirred at 1100 r / min for 2.5 hours, and then ultrasonicated at a frequency of 100 kHz for 1.5 hours to obtain the heat-resistant layer material; Preparation of the barrier layer material: 65 parts of ethylene-vinyl alcohol copolymer were added to 73 parts of n-propanol by mass, and stirred at 850 r / min. Then, 5 parts of succinamic acid and 13 parts of water were added, and stirred at 1200 r / min for 3.3 hours. Then, 2 parts of carbon nanotubes were added, and the mixture was ultrasonically treated at a frequency of 100 kHz for 2.2 hours. The temperature was then raised to 90°C and reacted for 2.7 hours. The mixture was then cooled to room temperature and dried at 105°C to obtain the barrier layer material. Preparation of heat seal material: Heat 60 parts by mass of high-density polyethylene and 40 parts by mass of metallocene polyethylene until molten, then add 5 parts of titanium carbide and 1.3 parts of zinc stearate, mix well, and co-extrude to obtain a heat seal material; By mass ratio, the base material comprises 45% high-density polyethylene and 55% low-density polyethylene, the aluminized layer comprises 5% alumina and 95% polyethylene, the connecting layer is ethylene-butyl acrylate copolymer, and the protective layer is polyurethane. Preparation of high-temperature resistant and high-barrier composite film: the above-mentioned substrate layer material, connecting layer material, barrier layer material, aluminum-plated layer material and protective layer material are sequentially added to a five-layer co-extrusion blown film line to obtain layer B, wherein the layer thickness ratio of the substrate layer, connecting layer, barrier layer, aluminum-plated layer and protective layer is 50:10:15:10:15; the substrate layer material and the barrier layer material are sequentially added to a two-layer co-extrusion blown film line to obtain a layer A precursor including a substrate layer and a barrier layer, and the heat-resistant layer material is coated on the outer surface of the substrate layer of the layer A precursor to obtain layer A, wherein the layer thickness ratio of the heat-resistant layer, substrate layer and barrier layer is 25:50:25; layer C is obtained by co-extrusion of the heat-sealing layer material; layer A, layer B and layer C are sequentially bonded using a polyimide adhesive to obtain a composite film, wherein the ratio of layer A, layer B and layer C is 15:25:10, and the total thickness of the composite film is 40μm.

[0037] Comparative Example 2: Preparation of the heat-resistant layer material: 15 parts of aluminum oxide and 5 parts of titanium nitride were added to 80 parts of water, stirred at 1100 r / min for 2.5 hours, and then ultrasonicated at a frequency of 100 kHz for 1.5 hours to obtain the heat-resistant layer material; Preparation of the barrier layer material: 65 parts of ethylene-vinyl alcohol copolymer were added to 73 parts of n-propanol by mass, and stirred at 850 r / min. Then, 15 parts of fluonic acid and 13 parts of water were added, and stirred at 1200 r / min for 3.3 hours. Then, 2 parts of carbon nanotubes were added, and ultrasonicated at a frequency of 100 kHz for 2.2 hours. Then, the temperature was raised to 90°C and reacted for 2.7 hours. Then, the mixture was cooled to room temperature and dried at 105°C to obtain the barrier layer material. Preparation of heat seal material: Heat 60 parts by mass of high-density polyethylene and 40 parts by mass of metallocene polyethylene until molten, then add 5 parts of titanium carbide and 1.3 parts of zinc stearate, mix well, and co-extrude to obtain a heat seal material; By mass ratio, the base material comprises 45% high-density polyethylene and 55% low-density polyethylene, the aluminized layer comprises 5% alumina and 95% polyethylene, the connecting layer is ethylene-butyl acrylate copolymer, and the protective layer is polyurethane. Preparation of high-temperature resistant and high-barrier composite film: the above-mentioned substrate layer material, connecting layer material, barrier layer material, aluminum-plated layer material and protective layer material are sequentially added to a five-layer co-extrusion blown film line to obtain layer B, wherein the layer thickness ratio of the substrate layer, connecting layer, barrier layer, aluminum-plated layer and protective layer is 50:10:15:10:15; the substrate layer material and the barrier layer material are sequentially added to a two-layer co-extrusion blown film line to obtain a layer A precursor including a substrate layer and a barrier layer, and the heat-resistant layer material is coated on the outer surface of the substrate layer of the layer A precursor to obtain layer A, wherein the layer thickness ratio of the heat-resistant layer, substrate layer and barrier layer is 25:50:25; layer C is obtained by co-extrusion of the heat-sealing layer material; layer A, layer B and layer C are sequentially bonded using a polyimide adhesive to obtain a composite film, wherein the ratio of layer A, layer B and layer C is 15:25:10, and the total thickness of the composite film is 40μm.

[0038] Comparative Example 3: Preparation of the heat-resistant layer material: 15 parts of aluminum oxide and 5 parts of titanium nitride were added to 80 parts of water, stirred at 1100 r / min for 2.5 hours, and then ultrasonicated at a frequency of 100 kHz for 1.5 hours to obtain the heat-resistant layer material; Preparation of the barrier layer material: 65 parts of ethylene-vinyl alcohol copolymer were added to 73 parts of n-propanol by mass, and stirred at 850 r / min. Then, 5 parts of succinamic acid, 15 parts of fluonic acid, and 13 parts of water were added, and stirred at 1200 r / min for 3.3 hours. Then, ultrasonication was performed at a frequency of 100 kHz for 2.2 hours. Then, the temperature was raised to 90°C and reacted for 2.7 hours. Then, the temperature was cooled to room temperature and dried at 105°C to obtain the barrier layer material. Preparation of heat seal material: Heat 60 parts by mass of high-density polyethylene and 40 parts by mass of metallocene polyethylene until molten, then add 5 parts of titanium carbide and 1.3 parts of zinc stearate, mix well, and co-extrude to obtain a heat seal material; By mass ratio, the base material comprises 45% high-density polyethylene and 55% low-density polyethylene, the aluminized layer comprises 5% alumina and 95% polyethylene, the connecting layer is ethylene-butyl acrylate copolymer, and the protective layer is polyurethane. Preparation of high-temperature resistant and high-barrier composite film: the above-mentioned substrate layer material, connecting layer material, barrier layer material, aluminum-plated layer material and protective layer material are sequentially added to a five-layer co-extrusion blown film line to obtain layer B, wherein the layer thickness ratio of the substrate layer, connecting layer, barrier layer, aluminum-plated layer and protective layer is 50:10:15:10:15; the substrate layer material and the barrier layer material are sequentially added to a two-layer co-extrusion blown film line to obtain a layer A precursor including a substrate layer and a barrier layer, and the heat-resistant layer material is coated on the outer surface of the substrate layer of the layer A precursor to obtain layer A, wherein the layer thickness ratio of the heat-resistant layer, substrate layer and barrier layer is 25:50:25; layer C is obtained by co-extrusion of the heat-sealing layer material; layer A, layer B and layer C are sequentially bonded using a polyimide adhesive to obtain a composite film, wherein the ratio of layer A, layer B and layer C is 15:25:10, and the total thickness of the composite film is 40μm.

[0039] Comparative Example 4: Preparation of the heat-resistant layer material: 15 parts of aluminum oxide and 5 parts of titanium nitride were added to 80 parts of water, stirred at 1100 r / min for 2.5 hours, and then ultrasonicated at a frequency of 100 kHz for 1.5 hours to obtain the heat-resistant layer material; Preparation of barrier layer material: 65 parts of ethylene-vinyl alcohol copolymer, 73 parts of n-propanol, 5 parts of succinamic acid, 15 parts of fluonic acid, 13 parts of water, and 2 parts of carbon nanotubes were mixed uniformly by mass, and dried at 105°C to obtain a barrier layer material; Preparation of heat seal material: Heat 60 parts by mass of high-density polyethylene and 40 parts by mass of metallocene polyethylene until molten, then add 5 parts of titanium carbide and 1.3 parts of zinc stearate, mix well, and co-extrude to obtain a heat seal material; By mass ratio, the base material comprises 45% high-density polyethylene and 55% low-density polyethylene, the aluminized layer comprises 5% alumina and 95% polyethylene, the connecting layer is ethylene-butyl acrylate copolymer, and the protective layer is polyurethane. Preparation of high-temperature resistant and high-barrier composite film: the above-mentioned substrate layer material, connecting layer material, barrier layer material, aluminum-plated layer material and protective layer material are sequentially added to a five-layer co-extrusion blown film line to obtain layer B, wherein the layer thickness ratio of the substrate layer, connecting layer, barrier layer, aluminum-plated layer and protective layer is 50:10:15:10:15; the substrate layer material and the barrier layer material are sequentially added to a two-layer co-extrusion blown film line to obtain a layer A precursor including a substrate layer and a barrier layer, and the heat-resistant layer material is coated on the outer surface of the substrate layer of the layer A precursor to obtain layer A, wherein the layer thickness ratio of the heat-resistant layer, substrate layer and barrier layer is 25:50:25; layer C is obtained by co-extrusion of the heat-sealing layer material; layer A, layer B and layer C are sequentially bonded using a polyimide adhesive to obtain a composite film, wherein the ratio of layer A, layer B and layer C is 15:25:10, and the total thickness of the composite film is 40μm.

[0040] Comparative Example 5: Preparation of the heat-resistant layer material: 15 parts of aluminum oxide were added to 80 parts of water by mass, stirred at a speed of 1100 r / min for 2.5 hours, and then ultrasonicated at a frequency of 100 kHz for 1.5 hours to obtain the heat-resistant layer material; Preparation of the barrier layer material: 65 parts of ethylene-vinyl alcohol copolymer were added to 73 parts of n-propanol by mass, and stirred at 850 r / min. Then, 5 parts of succinamic acid, 15 parts of fluonic acid, and 13 parts of water were added, and stirred at 1200 r / min for 3.3 hours. Then, 2 parts of carbon nanotubes were added, and the mixture was ultrasonically treated at a frequency of 100 kHz for 2.2 hours. The temperature was then raised to 90°C and reacted for 2.7 hours. The mixture was then cooled to room temperature and dried at 105°C to obtain the barrier layer material. Preparation of heat seal material: Heat 60 parts by mass of high-density polyethylene and 40 parts by mass of metallocene polyethylene until molten, then add 5 parts of titanium carbide and 1.3 parts of zinc stearate, mix well, and co-extrude to obtain a heat seal material; By mass ratio, the base material comprises 45% high-density polyethylene and 55% low-density polyethylene, the aluminized layer comprises 5% alumina and 95% polyethylene, the connecting layer is ethylene-butyl acrylate copolymer, and the protective layer is polyurethane. Preparation of high-temperature resistant and high-barrier composite film: the above-mentioned substrate layer material, connecting layer material, barrier layer material, aluminum-plated layer material and protective layer material are sequentially added to a five-layer co-extrusion blown film line to obtain layer B, wherein the layer thickness ratio of the substrate layer, connecting layer, barrier layer, aluminum-plated layer and protective layer is 50:10:15:10:15; the substrate layer material and the barrier layer material are sequentially added to a two-layer co-extrusion blown film line to obtain a layer A precursor including a substrate layer and a barrier layer, and the heat-resistant layer material is coated on the outer surface of the substrate layer of the layer A precursor to obtain layer A, wherein the layer thickness ratio of the heat-resistant layer, substrate layer and barrier layer is 25:50:25; layer C is obtained by co-extrusion of the heat-sealing layer material; layer A, layer B and layer C are sequentially bonded using a polyimide adhesive to obtain a composite film, wherein the ratio of layer A, layer B and layer C is 15:25:10, and the total thickness of the composite film is 40μm.

[0041] Comparative Example 6: Preparation of the heat-resistant layer material: 15 parts of aluminum oxide and 5 parts of titanium nitride were added to 80 parts of water, stirred at 1100 r / min for 2.5 hours, and then ultrasonicated at a frequency of 100 kHz for 1.5 hours to obtain the heat-resistant layer material; Preparation of the barrier layer material: 65 parts of ethylene-vinyl alcohol copolymer were added to 73 parts of n-propanol by mass, and stirred at 850 r / min. Then, 5 parts of succinamic acid, 15 parts of fluonic acid, and 13 parts of water were added, and stirred at 1200 r / min for 3.3 hours. Then, 2 parts of carbon nanotubes were added, and the mixture was ultrasonically treated at a frequency of 100 kHz for 2.2 hours. The temperature was then raised to 90°C and reacted for 2.7 hours. The mixture was then cooled to room temperature and dried at 105°C to obtain the barrier layer material. Preparation of heat seal material: Heat 60 parts by mass of high-density polyethylene and 40 parts by mass of metallocene polyethylene until molten, then add 1.3 parts of zinc stearate, mix well, and co-extrude to obtain heat seal material; By mass ratio, the base material comprises 45% high-density polyethylene and 55% low-density polyethylene, the aluminized layer comprises 5% alumina and 95% polyethylene, the connecting layer is ethylene-butyl acrylate copolymer, and the protective layer is polyurethane. Preparation of high-temperature resistant and high-barrier composite film: the above-mentioned substrate layer material, connecting layer material, barrier layer material, aluminum-plated layer material and protective layer material are sequentially added to a five-layer co-extrusion blown film line to obtain layer B, wherein the layer thickness ratio of the substrate layer, connecting layer, barrier layer, aluminum-plated layer and protective layer is 50:10:15:10:15; the substrate layer material and the barrier layer material are sequentially added to a two-layer co-extrusion blown film line to obtain a layer A precursor including a substrate layer and a barrier layer, and the heat-resistant layer material is coated on the outer surface of the substrate layer of the layer A precursor to obtain layer A, wherein the layer thickness ratio of the heat-resistant layer, substrate layer and barrier layer is 25:50:25; layer C is obtained by co-extrusion of the heat-sealing layer material; layer A, layer B and layer C are sequentially bonded using a polyimide adhesive to obtain a composite film, wherein the ratio of layer A, layer B and layer C is 15:25:10, and the total thickness of the composite film is 40μm.

[0042] The composite membranes obtained in the examples and comparative examples were tested, and the results are shown in Table 1.

[0043] The tensile strength was tested according to GB / T1040.3-2006, and the tensile strength of the composite film and the tensile strength after steaming at 100°C for 50 minutes were tested respectively; Oxygen transmission rate was tested at 23°C and 0% relative humidity. The water vapor transmission rate is tested according to GB / T26253-2010.

[0044] Table 1: Performance test results

[0045] As can be seen from Table 1, the high-temperature resistant and high-barrier composite film provided by the present invention comprises an A layer comprising a heat-resistant layer, a substrate layer and a barrier layer in sequence, a B layer comprising a substrate layer, a connecting layer, a barrier layer, an aluminum-plated layer and a protective layer in sequence, and a C layer comprising a heat-sealing layer, and the raw materials for preparing the heat-resistant layer material comprise aluminum oxide and titanium nitride, the raw materials for preparing the barrier layer material comprise ethylene-vinyl alcohol copolymer, succinamic acid, fluonic acid and carbon nanotubes, and the raw materials for preparing the heat-sealing layer material comprise titanium carbide, high-density polyethylene, metallocene polyethylene and zinc stearate. It has excellent high-temperature resistance and barrier properties; specifically, its water vapor transmission rate is as low as 0.78 g / (m 2 ·day·atm) and below, oxygen transmission rate as low as 4.93cm 3 / (m 2 ·day·0.1MPa), and the tensile strength after cooking in water vapor at 100°C for 50 minutes is as high as 50MPa or above; more specifically, the excellent tensile and barrier properties of carbon nanotubes themselves, the barrier properties of the fluorine element in fluonic acid, and the multi-functional groups of succinic acid undergo cross-linking. The barrier layer material modified with fluonic acid and carbon nanotubes not only provides excellent tensile strength, but also has high-temperature cooking stability and high barrier properties to water vapor and oxygen. The heat-resistant layer modified with titanium nitride and the heat-sealing layer modified with titanium carbide can provide strong high-temperature stability and maintain high barrier properties at high temperatures.

[0046] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A high temperature resistant and high barrier composite film, characterized in that: It includes layer A, layer B and layer C in sequence; The A layer includes a temperature-resistant layer, a substrate layer and a barrier layer in sequence; The B layer includes a substrate layer, a connecting layer, a barrier layer, an aluminum coating layer and a protective layer in sequence; The C layer is a heat sealing layer; The heat-resistant layer is made of heat-resistant layer materials, and the raw materials for preparing the heat-resistant layer materials include aluminum oxide and titanium nitride; The barrier layer is prepared by using a barrier layer material, and the raw materials for preparing the barrier layer include ethylene-vinyl alcohol copolymer, succinamic acid, fluonic acid and carbon nanotubes; The heat sealing layer is prepared by using heat sealing layer materials, and the raw materials for preparing the heat sealing layer include titanium carbide, high-density polyethylene, metallocene polyethylene and zinc stearate; The barrier layer of layer A is bonded to the protective layer of layer B, and the base material layer of layer B is bonded to the heat-sealing layer of layer C.

2. The high temperature resistant and high barrier composite film according to claim 1, characterized in that: In terms of mass ratio, the substrate layer is prepared from a substrate layer material, and the substrate layer material includes 35-55% of high-density polyethylene and 45-65% of low-density polyethylene.

3. The high temperature resistant and high barrier composite film according to claim 1, characterized in that: The connecting layer is prepared by using a connecting layer material, and the connecting layer material includes at least one of maleic anhydride-ethylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer and ethylene-butyl acrylate copolymer.

4. The high temperature resistant and high barrier composite film according to claim 1, characterized in that: According to the mass ratio, the aluminum plating layer is prepared by using an aluminum plating layer material, and the aluminum plating layer material includes 3-7% aluminum oxide and 97-93% polyethylene, and the material of the protective layer is polyurethane.

5. The high temperature resistant and high barrier composite film according to claim 1, characterized in that: The preparation method of the temperature-resistant layer material comprises the following steps: The aluminum oxide and the titanium nitride are added to water, stirred at a speed of 1000-1200 r / min for 2-3 hours, and then ultrasonicated at a frequency of 80-120 kHz for 1.3-1.7 hours to obtain the temperature-resistant layer material; The mass ratio of the aluminum oxide, titanium nitride and water is 10-20:3-7:75-85.

6. The high temperature resistant and high barrier composite film according to claim 1, characterized in that: The preparation method of the barrier layer material comprises the following steps: The ethylene-vinyl alcohol copolymer is added to n-propanol and stirred at a speed of 800-900 r / min, then succinamic acid, fluonic acid and water are added, and stirred at a speed of 1100-1300 r / min for 3.1-3.5 hours, and then carbon nanotubes are added, and ultrasonication is performed at a frequency of 80-120 kHz for 1.9-2.3 hours, and then the temperature is raised to 85-95° C. and reacted for 2.5-2.9 hours, and then cooled to room temperature and dried at 100-110° C. to obtain the barrier layer material; The mass ratio of the ethylene-vinyl alcohol copolymer, succinamic acid, fluonic acid, carbon nanotubes, n-propanol and water is 60-70:3-7:10-20:1-3:71-76:10-15.

7. The high temperature resistant and high barrier composite film according to claim 1, characterized in that: The preparation method of the heat sealing layer material comprises the following steps: The high-density polyethylene and the metallocene polyethylene are heated to a molten state, and then titanium carbide and zinc stearate are added, mixed evenly, and then co-extruded to obtain the heat-sealing layer material; The mass ratio of the titanium carbide, high-density polyethylene, metallocene polyethylene and zinc stearate is 3-7:55-65:35-45:1.1-1.

6.

8. The high temperature resistant and high barrier composite film according to claim 1, characterized in that: In layer B, the thickness of the substrate layer is 45-55% of the total thickness of layer B, the thickness of the connecting layer is 10-15% of the total thickness of layer B, the thickness of the barrier layer is 10-15% of the total thickness of layer B, the thickness of the aluminum-plated layer is 10-15% of the total thickness of layer B, and the thickness of the protective layer is 10-15% of the total thickness of layer B; In layer A, the thickness of the heat-resistant layer is 20-30% of the total thickness of layer A, the thickness of the substrate layer is 45-55% of the total thickness of layer A, and the thickness of the barrier layer is 20-30% of the total thickness of layer A.

9. A method for preparing a high temperature resistant and high barrier composite film, characterized in that: The preparation method is used to prepare the high-temperature resistant and high-barrier composite film according to any one of claims 1 to 8, and comprises the following steps: The substrate layer material, the connecting layer material, the barrier layer material, the aluminized layer material and the protective layer material are sequentially added into a five-layer co-extrusion blown film line to obtain a B layer including the substrate layer, the connecting layer, the barrier layer, the aluminized layer and the protective layer; The substrate layer material and the barrier layer material are sequentially added into a two-layer co-extrusion blown film line to obtain a layer A precursor comprising a substrate layer and a barrier layer, and the heat-resistant layer material is coated or sprayed on the outer surface of the substrate layer of the layer A precursor to obtain the A layer; Bonding the layer A, layer B, and layer C using a polyimide adhesive to obtain the high-temperature resistant and high-barrier composite film; The barrier layer of layer A is bonded to the protective layer of layer B, and the base material layer of layer B is bonded to the heat-sealing layer of layer C.

10. The preparation method according to claim 9, characterized in that The thickness ratio of the A layer, the B layer, and the C layer is 10-15:20-25:5-10, and the total thickness of the high-temperature resistant and high-barrier composite film is 15-65 μm.

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