A packaging high-barrier composite film and a method for preparing the same

Abstract

This invention discloses a high-barrier composite film for packaging and its preparation method. The invention relates to the field of layered materials, comprising layers A, B, and C sequentially. The raw materials for the heat-resistant layer material include alumina and magnesium oxide. The raw materials for the reinforcing layer material include modified ethylene-vinyl alcohol copolymer and polyamide-imide. The raw materials for the barrier layer material include modified ethylene-vinyl alcohol copolymer, high-density polyethylene, and polyetheretherketone resin. The raw materials for the heat-sealing layer material include chlorinated polypropylene, modified ethylene-vinyl alcohol copolymer, polyphenylene sulfide, and calcium stearate. The raw materials for the modified ethylene-vinyl alcohol copolymer include ethylene-vinyl alcohol copolymer, 7-chloro-6-fluoro-1-p-fluorophenyl-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid, 1,1-bis(trifluoromethyl)-2,2,3,3,3,3-pentafluoropropyl 2-fluoroacrylate, and acetone. The high-barrier composite film for packaging provided by this invention exhibits excellent barrier properties.

Description

Technical Field

[0001] This invention relates to the field of layered materials, and more specifically, to a high-barrier composite film for packaging and its preparation method. Background Technology

[0002] Polyethylene is a high-molecular-weight organic compound formed by the addition polymerization of ethylene. It is non-toxic, tasteless, and odorless, and is recognized worldwide as the best material for food contact, meeting food packaging hygiene standards. However, due to its poor gas barrier properties, even packaging films made from multi-layered polyethylene co-extruded films still have relatively poor barrier performance, making them unsuitable for packaging liquid foods such as beverages, juices, and milk. Patent publication number CN115572404A discloses a high-barrier composite film based on blown polyethylene film and its preparation method; however, the barrier performance of this polyethylene film still needs improvement and cannot meet usage requirements.

[0003] In summary, based on the applicant's extensive research, it has been found that the existing polyethylene films in this field have insufficient barrier properties. Therefore, there is a need to develop or improve a high-barrier composite packaging film and its preparation method. Summary of the Invention

[0004] Therefore, in order to solve the problem that existing polyethylene films have poor barrier properties and cannot meet the requirements for use, this invention provides a high-barrier composite packaging film and its preparation method, the specific technical solution of which is as follows:

[0005] A high-barrier composite film for packaging, comprising layers A, B, and C in sequence;

[0006] The A layer comprises, in sequence, a heat-resistant layer, a base layer, a connecting layer, a reinforcing layer, an aluminum-plated layer, and a protective layer;

[0007] Layer B is a barrier layer;

[0008] The C layer is a heat-sealing layer;

[0009] The heat-resistant layer is prepared from a heat-resistant layer material, and the raw materials for preparing the heat-resistant layer material include aluminum oxide and magnesium oxide.

[0010] The reinforcing layer is prepared from a reinforcing layer material, the raw materials for which the reinforcing layer material is prepared include modified ethylene-vinyl alcohol copolymer and polyamide imide;

[0011] The barrier layer is prepared from a barrier layer material, the raw materials for which include modified ethylene-vinyl alcohol copolymer, high-density polyethylene and polyetheretherketone resin.

[0012] The heat-sealing layer is prepared from a heat-sealing layer material, the raw materials for which include chlorinated polypropylene, modified ethylene-vinyl alcohol copolymer, polyphenylene sulfide, and calcium stearate.

[0013] The materials used to prepare the modified ethylene-vinyl alcohol copolymer include ethylene-vinyl alcohol copolymer, 7-chloro-6-fluoro-1-p-fluorophenyl-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid, 1,1-bis(trifluoromethyl)-2,2,3,3,3,3-pentafluoropropyl 2-fluoroacrylate, and acetone.

[0014] Furthermore, the base layer is prepared from a base layer material comprising 35-50% high-density polyethylene and 50-65% low-density polyethylene.

[0015] Furthermore, the connecting layer is prepared from a connecting layer material, which includes at least one of maleic anhydride-ethylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, and ethylene-butyl acrylate copolymer.

[0016] Furthermore, the aluminum plating layer is prepared from an aluminum plating layer material, which, by mass ratio, comprises 3-7% aluminum oxide and 97-93% polyethylene, and the protective layer material is polyurethane.

[0017] Furthermore, the preparation method of the modified ethylene-vinyl alcohol copolymer includes the following steps:

[0018] The ethylene-vinyl alcohol copolymer was added to the acetone, and then sonicated at a frequency of 80-120 kHz for 15-25 min. Then, the 7-chloro-6-fluoro-1-p-fluorophenyl-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid and the 1,1-bis(trifluoromethyl)-2,2,3,3,3,3-pentafluoropropyl 2-fluoroacrylate were added. The mixture was stirred at a speed of 800-1000 r / min until homogeneous. Then, the temperature was raised to 85-95 °C and the mixture was sealed and reacted for 2.3-2.7 h. The reaction was then stopped and cooled to room temperature. The product was then removed and dried at 80-90 °C to obtain the modified ethylene-vinyl alcohol copolymer.

[0019] The mass ratio of the ethylene-vinyl alcohol copolymer, 7-chloro-6-fluoro-1-p-fluorophenyl-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid, 1,1-bis(trifluoromethyl)-2,2,3,3,3,3-pentafluoropropyl 2-fluoroacrylate and acetone is 60~70:3~7:3~7:20~30.

[0020] Furthermore, the method for preparing the reinforcing layer material includes the following steps:

[0021] The modified ethylene-vinyl alcohol copolymer and polyamide-imide are extruded in a twin-screw extruder to obtain the reinforcing layer material;

[0022] The mass ratio of the modified ethylene-vinyl alcohol copolymer to the polyamide imide is 65~75:25~35.

[0023] Furthermore, the method for preparing the heat-resistant layer material includes the following steps:

[0024] The alumina and magnesium oxide are added to water and stirred at 1300-1700 r / min for 1-2 h, and then sonicated at a frequency of 80-120 kHz for 2.1-2.5 h to obtain the heat-resistant layer material.

[0025] The mass ratio of alumina, magnesium oxide and water is 10~15:3~7:30~40.

[0026] Furthermore, the preparation method of the heat-sealing layer material includes the following steps:

[0027] The chlorinated polypropylene, modified ethylene-vinyl alcohol copolymer, polyphenylene sulfide, and calcium stearate are extruded in a twin-screw extruder to obtain the heat-sealing layer material;

[0028] The mass ratio of the chlorinated polypropylene, modified ethylene-vinyl alcohol copolymer, polyphenylene sulfide and calcium stearate is 25~30:30~40:10~15:0.5~1.5.

[0029] Furthermore, the method for preparing the barrier layer material includes the following steps:

[0030] The ethylene-vinyl alcohol copolymer, high-density polyethylene, and polyether ether ketone resin are extruded in a twin-screw extruder to obtain the barrier layer material.

[0031] The mass ratio of the ethylene-vinyl alcohol copolymer, high-density polyethylene, and polyetheretherketone resin is 20~25:30~40:10~15.

[0032] This technical solution also provides a method for preparing a high-barrier composite film for packaging, which includes the following steps:

[0033] The base layer material, connecting layer material, reinforcing layer material, aluminized layer material and protective layer material are sequentially added to a five-layer co-extrusion blown film line to obtain a layer A precursor including a base layer, connecting layer, reinforcing layer, aluminized layer and protective layer. A heat-resistant layer material is coated or sprayed onto the outer surface of the base layer of the layer A precursor to obtain layer A.

[0034] The barrier layer material is blow-molded to obtain layer B;

[0035] Layer C is obtained by blow molding the heat-sealing layer material;

[0036] Layers A, B, and C are bonded together using a polyimide adhesive to obtain the high-barrier composite film for packaging.

[0037] The thickness of the base layer is 45-55% of the total thickness of layer A, the thickness of the connecting layer is 5-15% of the total thickness of layer A, the thickness of the reinforcing layer is 5-15% of the total thickness of layer A, the thickness of the aluminum plating layer is 5-15% of the total thickness of layer A, the thickness of the protective layer is 5-15% of the total thickness of layer A, and the thickness of the heat-resistant layer is 5-15% of the total thickness of layer A.

[0038] The thickness ratio of the A, B and C layers is 15~25:5~15:5~15.

[0039] The high-barrier composite film for packaging provided by the above technical solution has the following characteristics: the raw materials for preparing the reinforcing layer material include modified ethylene-vinyl alcohol copolymer and polyamide-imide; the raw materials for preparing the barrier layer material include modified ethylene-vinyl alcohol copolymer, high-density polyethylene, and polyetheretherketone resin; and the raw materials for preparing the heat-sealing layer material include chlorinated polypropylene, modified ethylene-vinyl alcohol copolymer, polyphenylene sulfide, and calcium stearate. Furthermore, the raw materials for preparing the modified ethylene-vinyl alcohol copolymer include ethylene-vinyl alcohol copolymer, 7-chloro-6-fluoro-1-p-fluorophenyl-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid, and 1,1-bis(trifluoromethyl)-2,2,3,3,3,3-pentafluoropropyl-2- Fluoroacrylates and acetone are used to prepare high-barrier composite films for packaging, which exhibit excellent barrier properties. Specifically, 7-chloro-6-fluoro-1-p-fluorophenyl-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid and 1,1-bis(trifluoromethyl)-2,2,3,3,3,3-pentafluoropropyl 2-fluoroacrylates possess multifunctional groups. Their fluorine, chlorine, benzene, nitrogen-containing rings, carboxyl, alkenyl, and ester groups are linked in multiple dimensions. Furthermore, some groups are linked with ethylene-vinyl alcohol copolymers, resulting in a more dense molecular structure and significantly enhanced barrier properties. Therefore, the high-barrier composite films prepared from these copolymers exhibit excellent barrier properties. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of the high-barrier composite film for packaging in this application.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Heat-resistant layer; 2. Base layer; 3. Connecting layer; 4. Reinforcing layer; 5. Aluminized layer; 6. Protective layer; 7. Barrier layer; 8. Heat-sealing layer. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to its embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of protection of the invention.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0045] One embodiment of the present invention provides a high-barrier composite film for packaging, which sequentially comprises layer A, layer B, and layer C.

[0046] The A layer comprises, in sequence, a heat-resistant layer 1, a base layer 2, a connecting layer 3, a reinforcing layer 4, an aluminum-plated layer 5, and a protective layer 6;

[0047] The B layer is the barrier layer 7;

[0048] The C layer is a heat-sealing layer 8;

[0049] The heat-resistant layer 1 is prepared from a heat-resistant layer material, and the raw materials for preparing the heat-resistant layer material include aluminum oxide and magnesium oxide.

[0050] The reinforcing layer 4 is prepared from a reinforcing layer material, the raw materials for which include modified ethylene-vinyl alcohol copolymer and polyamide imide.

[0051] The barrier layer 7 is prepared from a barrier layer material, the raw materials for which include modified ethylene-vinyl alcohol copolymer, high-density polyethylene and polyetheretherketone resin.

[0052] The heat-sealing layer 8 is prepared from a heat-sealing layer material, the raw materials for which include chlorinated polypropylene, modified ethylene-vinyl alcohol copolymer, polyphenylene sulfide and calcium stearate.

[0053] The materials used to prepare the modified ethylene-vinyl alcohol copolymer include ethylene-vinyl alcohol copolymer, 7-chloro-6-fluoro-1-p-fluorophenyl-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid, 1,1-bis(trifluoromethyl)-2,2,3,3,3,3-pentafluoropropyl 2-fluoroacrylate, and acetone.

[0054] In one embodiment, the base layer 2 is prepared from a base layer material comprising 35-50% high-density polyethylene and 50-65% low-density polyethylene.

[0055] In one embodiment, the connecting layer 3 is prepared from a connecting layer material, which includes at least one of maleic anhydride-ethylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, and ethylene-butyl acrylate copolymer.

[0056] In one embodiment, the aluminum plating layer 5 is prepared from an aluminum plating layer material, which, by mass ratio, comprises 3-7% aluminum oxide and 97-93% polyethylene, and the protective layer material is polyurethane.

[0057] In one embodiment, the method for preparing the modified ethylene-vinyl alcohol copolymer includes the following steps:

[0058] The ethylene-vinyl alcohol copolymer was added to the acetone, and then sonicated at a frequency of 80-120 kHz for 15-25 min. Then, the 7-chloro-6-fluoro-1-p-fluorophenyl-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid and the 1,1-bis(trifluoromethyl)-2,2,3,3,3,3-pentafluoropropyl 2-fluoroacrylate were added. The mixture was stirred at a speed of 800-1000 r / min until homogeneous. Then, the temperature was raised to 85-95 °C and the mixture was sealed and reacted for 2.3-2.7 h. The reaction was then stopped and cooled to room temperature. The product was then removed and dried at 80-90 °C to obtain the modified ethylene-vinyl alcohol copolymer.

[0059] The mass ratio of the ethylene-vinyl alcohol copolymer, 7-chloro-6-fluoro-1-p-fluorophenyl-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid, 1,1-bis(trifluoromethyl)-2,2,3,3,3,3-pentafluoropropyl 2-fluoroacrylate and acetone is 60~70:3~7:3~7:20~30.

[0060] In one embodiment, the method for preparing the reinforcing layer material includes the following steps:

[0061] The modified ethylene-vinyl alcohol copolymer and polyamide-imide are extruded in a twin-screw extruder to obtain the reinforcing layer material;

[0062] The mass ratio of the modified ethylene-vinyl alcohol copolymer to the polyamide imide is 65~75:25~35.

[0063] In one embodiment, the method for preparing the heat-resistant layer material includes the following steps:

[0064] The alumina and magnesium oxide are added to water and stirred at 1300-1700 r / min for 1-2 h, and then sonicated at a frequency of 80-120 kHz for 2.1-2.5 h to obtain the heat-resistant layer material.

[0065] The mass ratio of alumina, magnesium oxide and water is 10~15:3~7:30~40.

[0066] In one embodiment, the method for preparing the heat-sealing layer material includes the following steps:

[0067] The chlorinated polypropylene, modified ethylene-vinyl alcohol copolymer, polyphenylene sulfide, and calcium stearate are extruded in a twin-screw extruder to obtain the heat-sealing layer material;

[0068] The mass ratio of the chlorinated polypropylene, modified ethylene-vinyl alcohol copolymer, polyphenylene sulfide and calcium stearate is 25~30:30~40:10~15:0.5~1.5.

[0069] In one embodiment, the method for preparing the barrier layer material includes the following steps:

[0070] The ethylene-vinyl alcohol copolymer, high-density polyethylene, and polyether ether ketone resin are extruded in a twin-screw extruder to obtain the barrier layer material.

[0071] The mass ratio of the ethylene-vinyl alcohol copolymer, high-density polyethylene, and polyetheretherketone resin is 20~25:30~40:10~15.

[0072] In one embodiment, this technical solution provides a method for preparing a high-barrier composite film for packaging, which includes the following steps:

[0073] The base layer material, connecting layer material, reinforcing layer material, aluminized layer material and protective layer material are sequentially added to a five-layer co-extrusion blown film line to obtain a layer A precursor including a base layer, connecting layer, reinforcing layer, aluminized layer and protective layer. A heat-resistant layer material is coated or sprayed onto the outer surface of the base layer of the layer A precursor to obtain layer A.

[0074] The barrier layer material is blow-molded to obtain layer B;

[0075] Layer C is obtained by blow molding the heat-sealing layer material;

[0076] Layers A, B, and C are bonded together using a polyimide adhesive to obtain the high-barrier composite film for packaging.

[0077] The thickness of the base layer is 45-55% of the total thickness of layer A, the thickness of the connecting layer is 5-15% of the total thickness of layer A, the thickness of the reinforcing layer is 5-15% of the total thickness of layer A, the thickness of the aluminum plating layer is 5-15% of the total thickness of layer A, the thickness of the protective layer is 5-15% of the total thickness of layer A, and the thickness of the heat-resistant layer is 5-15% of the total thickness of layer A.

[0078] The thickness ratio of the A, B and C layers is 15~25:5~15:5~15.

[0079] like Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of the high-barrier composite film for packaging in this application. Figure 1 As can be seen from the above, the high-barrier composite film for packaging in this application comprises layer A, layer B, and layer C in sequence;

[0080] The A layer comprises, in sequence, a heat-resistant layer 1, a base layer 2, a connecting layer 3, a reinforcing layer 4, an aluminum-plated layer 5, and a protective layer 6; the B layer is a barrier layer 7; and the C layer is a heat-sealing layer 8.

[0081] The implementation schemes of the present invention will now be described in detail with reference to specific embodiments.

[0082] Example 1:

[0083] Preparation of modified ethylene-vinyl alcohol copolymer: 65 parts by weight of ethylene-vinyl alcohol copolymer were added to 25 parts by weight of acetone, and then sonicated at 100 kHz for 20 min. Then, 5 parts by weight of 7-chloro-6-fluoro-1-p-fluorophenyl-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid and 5 parts by weight of 1,1-bis(trifluoromethyl)-2,2,3,3,3,3-pentafluoropropyl 2-fluoroacrylate were added. The mixture was stirred at 900 r / min until homogeneous, and then heated to 90 °C and sealed for 2.5 h. The reaction was then stopped and cooled to room temperature. The product was then dried at 85 °C to obtain the modified ethylene-vinyl alcohol copolymer.

[0084] Preparation of reinforcing layer material: 70 parts by weight of modified ethylene-vinyl alcohol copolymer and 30 parts by weight of polyamide-imide were extruded in a twin-screw extruder to obtain the reinforcing layer material;

[0085] Preparation of heat-resistant layer material: 13 parts by weight of alumina and 5 parts by weight of magnesium oxide were added to 35 parts by weight of water, stirred at 1500 r / min for 1.5 h, and then sonicated at 100 kHz for 2.3 h to obtain heat-resistant layer material;

[0086] Preparation of heat-sealing layer material: 27 parts by weight of chlorinated polypropylene, 35 parts by weight of modified ethylene-vinyl alcohol copolymer, 13 parts by weight of polyphenylene sulfide and 1 part by weight of calcium stearate were extruded in a twin-screw extruder to obtain heat-sealing layer material.

[0087] Preparation of barrier layer material: 23 parts by weight of ethylene-vinyl alcohol copolymer, 35 parts by weight of high-density polyethylene and 13 parts by weight of polyether ether ketone resin were extruded in a twin-screw extruder to obtain barrier layer material;

[0088] By weight, the base layer material consists of 42% high-density polyethylene and 58% low-density polyethylene, the aluminized layer material consists of 5% alumina and 95% polyethylene, the connecting layer material is ethylene-acrylic acid copolymer, and the protective layer material is polyurethane.

[0089] Preparation of high-temperature resistant and high-barrier composite film: The above-mentioned base layer material, connecting layer material, reinforcing layer material, aluminized layer material and protective layer material are sequentially added to a five-layer co-extrusion blown film line to obtain a precursor A, which includes a base layer, connecting layer, reinforcing layer, aluminized layer and protective layer. A heat-resistant layer material is coated on the outer surface of the base layer of the precursor A to obtain layer A. The barrier layer material is blow-molded to obtain layer B. The heat-sealing layer material is blow-molded to obtain layer C. Layers A, B and C are bonded together with polyimide adhesive to obtain a high-barrier packaging composite film, wherein layer A is 20μm, layer B is 10μm, layer C is 10μm, heat-resistant layer is 2μm, base layer is 10μm, connecting layer is 1μm, reinforcing layer is 3μm, aluminized layer is 2μm and protective layer is 2μm.

[0090] Example 2:

[0091] Preparation of modified ethylene-vinyl alcohol copolymer: 65 parts by weight of ethylene-vinyl alcohol copolymer were added to 25 parts by weight of acetone, and then sonicated at 100 kHz for 20 min. Then, 7 parts by weight of 7-chloro-6-fluoro-1-p-fluorophenyl-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid and 5 parts by weight of 1,1-bis(trifluoromethyl)-2,2,3,3,3,3-pentafluoropropyl 2-fluoroacrylate were added. The mixture was stirred at 900 r / min until homogeneous, and then heated to 90 °C and sealed for 2.5 h. The reaction was then stopped and cooled to room temperature. The product was then dried at 85 °C to obtain the modified ethylene-vinyl alcohol copolymer.

[0092] Preparation of reinforcing layer material: 70 parts by weight of modified ethylene-vinyl alcohol copolymer and 30 parts by weight of polyamide-imide were extruded in a twin-screw extruder to obtain the reinforcing layer material;

[0093] Preparation of heat-resistant layer material: 13 parts by weight of alumina and 5 parts by weight of magnesium oxide were added to 35 parts by weight of water, stirred at 1500 r / min for 1.5 h, and then sonicated at 100 kHz for 2.3 h to obtain heat-resistant layer material;

[0094] Preparation of heat-sealing layer material: 27 parts by weight of chlorinated polypropylene, 35 parts by weight of modified ethylene-vinyl alcohol copolymer, 13 parts by weight of polyphenylene sulfide and 1 part by weight of calcium stearate were extruded in a twin-screw extruder to obtain heat-sealing layer material.

[0095] Preparation of barrier layer material: 23 parts by weight of ethylene-vinyl alcohol copolymer, 35 parts by weight of high-density polyethylene and 13 parts by weight of polyether ether ketone resin were extruded in a twin-screw extruder to obtain barrier layer material;

[0096] By weight, the base layer material consists of 42% high-density polyethylene and 58% low-density polyethylene, the aluminized layer material consists of 5% alumina and 95% polyethylene, the connecting layer material is ethylene-acrylic acid copolymer, and the protective layer material is polyurethane.

[0097] Preparation of high-temperature resistant and high-barrier composite film: The above-mentioned base layer material, connecting layer material, reinforcing layer material, aluminized layer material and protective layer material are sequentially added to a five-layer co-extrusion blown film line to obtain a precursor A, which includes a base layer, connecting layer, reinforcing layer, aluminized layer and protective layer. A heat-resistant layer material is coated on the outer surface of the base layer of the precursor A to obtain layer A. The barrier layer material is blow-molded to obtain layer B. The heat-sealing layer material is blow-molded to obtain layer C. Layers A, B and C are bonded together with polyimide adhesive to obtain a high-barrier packaging composite film, wherein layer A is 20μm, layer B is 10μm, layer C is 10μm, heat-resistant layer is 2μm, base layer is 10μm, connecting layer is 1μm, reinforcing layer is 3μm, aluminized layer is 2μm and protective layer is 2μm.

[0098] Example 3:

[0099] Preparation of modified ethylene-vinyl alcohol copolymer: 65 parts by weight of ethylene-vinyl alcohol copolymer were added to 25 parts by weight of acetone, and then sonicated at 100 kHz for 20 min. Then, 3 parts by weight of 7-chloro-6-fluoro-1-p-fluorophenyl-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid and 5 parts by weight of 1,1-bis(trifluoromethyl)-2,2,3,3,3,3-pentafluoropropyl 2-fluoroacrylate were added. The mixture was stirred at 900 r / min until homogeneous, and then heated to 90 °C and sealed for 2.5 h. The reaction was then stopped and cooled to room temperature. The product was then dried at 85 °C to obtain the modified ethylene-vinyl alcohol copolymer.

[0100] Preparation of reinforcing layer material: 70 parts by weight of modified ethylene-vinyl alcohol copolymer and 30 parts by weight of polyamide-imide were extruded in a twin-screw extruder to obtain the reinforcing layer material;

[0101] Preparation of heat-resistant layer material: 13 parts by weight of alumina and 5 parts by weight of magnesium oxide were added to 35 parts by weight of water, stirred at 1500 r / min for 1.5 h, and then sonicated at 100 kHz for 2.3 h to obtain heat-resistant layer material;

[0102] Preparation of heat-sealing layer material: 27 parts by weight of chlorinated polypropylene, 35 parts by weight of modified ethylene-vinyl alcohol copolymer, 13 parts by weight of polyphenylene sulfide and 1 part by weight of calcium stearate were extruded in a twin-screw extruder to obtain heat-sealing layer material.

[0103] Preparation of barrier layer material: 23 parts by weight of ethylene-vinyl alcohol copolymer, 35 parts by weight of high-density polyethylene and 13 parts by weight of polyether ether ketone resin were extruded in a twin-screw extruder to obtain barrier layer material;

[0104] By weight, the base layer material consists of 42% high-density polyethylene and 58% low-density polyethylene, the aluminized layer material consists of 5% alumina and 95% polyethylene, the connecting layer material is ethylene-acrylic acid copolymer, and the protective layer material is polyurethane.

[0105] Preparation of high-temperature resistant and high-barrier composite film: The above-mentioned base layer material, connecting layer material, reinforcing layer material, aluminized layer material and protective layer material are sequentially added to a five-layer co-extrusion blown film line to obtain a precursor A, which includes a base layer, connecting layer, reinforcing layer, aluminized layer and protective layer. A heat-resistant layer material is coated on the outer surface of the base layer of the precursor A to obtain layer A. The barrier layer material is blow-molded to obtain layer B. The heat-sealing layer material is blow-molded to obtain layer C. Layers A, B and C are bonded together with polyimide adhesive to obtain a high-barrier packaging composite film, wherein layer A is 20μm, layer B is 10μm, layer C is 10μm, heat-resistant layer is 2μm, base layer is 10μm, connecting layer is 1μm, reinforcing layer is 3μm, aluminized layer is 2μm and protective layer is 2μm.

[0106] Example 4:

[0107] Preparation of modified ethylene-vinyl alcohol copolymer: 65 parts by weight of ethylene-vinyl alcohol copolymer were added to 25 parts by weight of acetone, and then sonicated at 100 kHz for 20 min. Then, 5 parts by weight of 7-chloro-6-fluoro-1-p-fluorophenyl-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid and 7 parts by weight of 1,1-bis(trifluoromethyl)-2,2,3,3,3,3-pentafluoropropyl 2-fluoroacrylate were added. The mixture was stirred at 900 r / min until homogeneous, and then heated to 90 °C and sealed for 2.5 h. The reaction was then stopped and cooled to room temperature. The product was then removed and dried at 85 °C to obtain the modified ethylene-vinyl alcohol copolymer.

[0108] Preparation of reinforcing layer material: 70 parts by weight of modified ethylene-vinyl alcohol copolymer and 30 parts by weight of polyamide-imide were extruded in a twin-screw extruder to obtain the reinforcing layer material;

[0109] Preparation of heat-resistant layer material: 13 parts by weight of alumina and 5 parts by weight of magnesium oxide were added to 35 parts by weight of water, stirred at 1500 r / min for 1.5 h, and then sonicated at 100 kHz for 2.3 h to obtain heat-resistant layer material;

[0110] Preparation of heat-sealing layer material: 27 parts by weight of chlorinated polypropylene, 35 parts by weight of modified ethylene-vinyl alcohol copolymer, 13 parts by weight of polyphenylene sulfide and 1 part by weight of calcium stearate were extruded in a twin-screw extruder to obtain heat-sealing layer material.

[0111] Preparation of barrier layer material: 23 parts by weight of ethylene-vinyl alcohol copolymer, 35 parts by weight of high-density polyethylene and 13 parts by weight of polyether ether ketone resin were extruded in a twin-screw extruder to obtain barrier layer material;

[0112] By weight, the base layer material consists of 42% high-density polyethylene and 58% low-density polyethylene, the aluminized layer material consists of 5% alumina and 95% polyethylene, the connecting layer material is ethylene-acrylic acid copolymer, and the protective layer material is polyurethane.

[0113] Preparation of high-temperature resistant and high-barrier composite film: The above-mentioned base layer material, connecting layer material, reinforcing layer material, aluminized layer material and protective layer material are sequentially added to a five-layer co-extrusion blown film line to obtain a precursor A, which includes a base layer, connecting layer, reinforcing layer, aluminized layer and protective layer. A heat-resistant layer material is coated on the outer surface of the base layer of the precursor A to obtain layer A. The barrier layer material is blow-molded to obtain layer B. The heat-sealing layer material is blow-molded to obtain layer C. Layers A, B and C are bonded together with polyimide adhesive to obtain a high-barrier packaging composite film, wherein layer A is 20μm, layer B is 10μm, layer C is 10μm, heat-resistant layer is 2μm, base layer is 10μm, connecting layer is 1μm, reinforcing layer is 3μm, aluminized layer is 2μm and protective layer is 2μm.

[0114] Example 5:

[0115] Preparation of modified ethylene-vinyl alcohol copolymer: 65 parts by weight of ethylene-vinyl alcohol copolymer were added to 25 parts by weight of acetone, and then sonicated at 100 kHz for 20 min. Then, 5 parts by weight of 7-chloro-6-fluoro-1-p-fluorophenyl-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid and 3 parts by weight of 1,1-bis(trifluoromethyl)-2,2,3,3,3,3-pentafluoropropyl 2-fluoroacrylate were added. The mixture was stirred at 900 r / min until homogeneous, and then heated to 90 °C and sealed for 2.5 h. The reaction was then stopped and cooled to room temperature. The product was then dried at 85 °C to obtain the modified ethylene-vinyl alcohol copolymer.

[0116] Preparation of reinforcing layer material: 70 parts by weight of modified ethylene-vinyl alcohol copolymer and 30 parts by weight of polyamide-imide were extruded in a twin-screw extruder to obtain the reinforcing layer material;

[0117] Preparation of heat-resistant layer material: 13 parts by weight of alumina and 5 parts by weight of magnesium oxide were added to 35 parts by weight of water, stirred at 1500 r / min for 1.5 h, and then sonicated at 100 kHz for 2.3 h to obtain heat-resistant layer material;

[0118] Preparation of heat-sealing layer material: 27 parts by weight of chlorinated polypropylene, 35 parts by weight of modified ethylene-vinyl alcohol copolymer, 13 parts by weight of polyphenylene sulfide and 1 part by weight of calcium stearate were extruded in a twin-screw extruder to obtain heat-sealing layer material.

[0119] Preparation of barrier layer material: 23 parts by weight of ethylene-vinyl alcohol copolymer, 35 parts by weight of high-density polyethylene and 13 parts by weight of polyether ether ketone resin were extruded in a twin-screw extruder to obtain barrier layer material;

[0120] By weight, the base layer material consists of 42% high-density polyethylene and 58% low-density polyethylene, the aluminized layer material consists of 5% alumina and 95% polyethylene, the connecting layer material is ethylene-acrylic acid copolymer, and the protective layer material is polyurethane.

[0121] Preparation of high-temperature resistant and high-barrier composite film: The above-mentioned base layer material, connecting layer material, reinforcing layer material, aluminized layer material and protective layer material are sequentially added to a five-layer co-extrusion blown film line to obtain a precursor A, which includes a base layer, connecting layer, reinforcing layer, aluminized layer and protective layer. A heat-resistant layer material is coated on the outer surface of the base layer of the precursor A to obtain layer A. The barrier layer material is blow-molded to obtain layer B. The heat-sealing layer material is blow-molded to obtain layer C. Layers A, B and C are bonded together with polyimide adhesive to obtain a high-barrier packaging composite film, wherein layer A is 20μm, layer B is 10μm, layer C is 10μm, heat-resistant layer is 2μm, base layer is 10μm, connecting layer is 1μm, reinforcing layer is 3μm, aluminized layer is 2μm and protective layer is 2μm.

[0122] Comparative Example 1:

[0123] Preparation of modified ethylene-vinyl alcohol copolymer: 65 parts by weight of ethylene-vinyl alcohol copolymer were added to 25 parts by weight of acetone, and then sonicated at a frequency of 100 kHz for 20 min. Then 5 parts by weight of 1,1-bis(trifluoromethyl)-2,2,3,3,3,3-pentafluoropropyl 2-fluoroacrylate were added and stirred at a speed of 900 r / min until homogeneous. Then the temperature was raised to 90 °C and the reaction was sealed for 2.5 h. The reaction was then stopped and cooled to room temperature. The product was then taken out and dried at 85 °C to obtain the modified ethylene-vinyl alcohol copolymer.

[0124] Preparation of reinforcing layer material: 70 parts by weight of modified ethylene-vinyl alcohol copolymer and 30 parts by weight of polyamide-imide were extruded in a twin-screw extruder to obtain the reinforcing layer material;

[0125] Preparation of heat-resistant layer material: 13 parts by weight of alumina and 5 parts by weight of magnesium oxide were added to 35 parts by weight of water, stirred at 1500 r / min for 1.5 h, and then sonicated at 100 kHz for 2.3 h to obtain heat-resistant layer material;

[0126] Preparation of heat-sealing layer material: 27 parts by weight of chlorinated polypropylene, 35 parts by weight of modified ethylene-vinyl alcohol copolymer, 13 parts by weight of polyphenylene sulfide and 1 part by weight of calcium stearate were extruded in a twin-screw extruder to obtain heat-sealing layer material.

[0127] Preparation of barrier layer material: 23 parts by weight of ethylene-vinyl alcohol copolymer, 35 parts by weight of high-density polyethylene and 13 parts by weight of polyether ether ketone resin were extruded in a twin-screw extruder to obtain barrier layer material;

[0128] By weight, the base layer material consists of 42% high-density polyethylene and 58% low-density polyethylene, the aluminized layer material consists of 5% alumina and 95% polyethylene, the connecting layer material is ethylene-acrylic acid copolymer, and the protective layer material is polyurethane.

[0129] Preparation of high-temperature resistant and high-barrier composite film: The above-mentioned base layer material, connecting layer material, reinforcing layer material, aluminized layer material and protective layer material are sequentially added to a five-layer co-extrusion blown film line to obtain a precursor A, which includes a base layer, connecting layer, reinforcing layer, aluminized layer and protective layer. A heat-resistant layer material is coated on the outer surface of the base layer of the precursor A to obtain layer A. The barrier layer material is blow-molded to obtain layer B. The heat-sealing layer material is blow-molded to obtain layer C. Layers A, B and C are bonded together with polyimide adhesive to obtain a composite film, wherein layer A is 20μm, layer B is 10μm, layer C is 10μm, heat-resistant layer is 2μm, base layer is 10μm, connecting layer is 1μm, reinforcing layer is 3μm, aluminized layer is 2μm and protective layer is 2μm.

[0130] Comparative Example 2:

[0131] Preparation of modified ethylene-vinyl alcohol copolymer: 65 parts by weight of ethylene-vinyl alcohol copolymer were added to 25 parts by weight of acetone, and then sonicated at a frequency of 100 kHz for 20 min. Then 5 parts by weight of 7-chloro-6-fluoro-1-p-fluorophenyl-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid were added and stirred at a speed of 900 r / min until homogeneous. Then the temperature was raised to 90 °C and the reaction was sealed for 2.5 h. The reaction was then stopped and cooled to room temperature. The product was then taken out and dried at 85 °C to obtain the modified ethylene-vinyl alcohol copolymer.

[0132] Preparation of reinforcing layer material: 70 parts by weight of modified ethylene-vinyl alcohol copolymer and 30 parts by weight of polyamide-imide were extruded in a twin-screw extruder to obtain the reinforcing layer material;

[0133] Preparation of heat-resistant layer material: 13 parts by weight of alumina and 5 parts by weight of magnesium oxide were added to 35 parts by weight of water, stirred at 1500 r / min for 1.5 h, and then sonicated at 100 kHz for 2.3 h to obtain heat-resistant layer material;

[0134] Preparation of heat-sealing layer material: 27 parts by weight of chlorinated polypropylene, 35 parts by weight of modified ethylene-vinyl alcohol copolymer, 13 parts by weight of polyphenylene sulfide and 1 part by weight of calcium stearate were extruded in a twin-screw extruder to obtain heat-sealing layer material.

[0135] Preparation of barrier layer material: 23 parts by weight of ethylene-vinyl alcohol copolymer, 35 parts by weight of high-density polyethylene and 13 parts by weight of polyether ether ketone resin were extruded in a twin-screw extruder to obtain barrier layer material;

[0136] By weight, the base layer material consists of 42% high-density polyethylene and 58% low-density polyethylene, the aluminized layer material consists of 5% alumina and 95% polyethylene, the connecting layer material is ethylene-acrylic acid copolymer, and the protective layer material is polyurethane.

[0137] Preparation of high-temperature resistant and high-barrier composite film: The above-mentioned base layer material, connecting layer material, reinforcing layer material, aluminized layer material and protective layer material are sequentially added to a five-layer co-extrusion blown film line to obtain a precursor A, which includes a base layer, connecting layer, reinforcing layer, aluminized layer and protective layer. A heat-resistant layer material is coated on the outer surface of the base layer of the precursor A to obtain layer A. The barrier layer material is blow-molded to obtain layer B. The heat-sealing layer material is blow-molded to obtain layer C. Layers A, B and C are bonded together with polyimide adhesive to obtain a composite film, wherein layer A is 20μm, layer B is 10μm, layer C is 10μm, heat-resistant layer is 2μm, base layer is 10μm, connecting layer is 1μm, reinforcing layer is 3μm, aluminized layer is 2μm and protective layer is 2μm.

[0138] Comparative Example 3:

[0139] Preparation of modified ethylene-vinyl alcohol copolymer: 65 parts by weight of ethylene-vinyl alcohol copolymer, 5 parts by weight of 7-chloro-6-fluoro-1-p-fluorophenyl-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid and 5 parts by weight of 1,1-bis(trifluoromethyl)-2,2,3,3,3,3-pentafluoropropyl 2-fluoroacrylate were mixed evenly to obtain modified ethylene-vinyl alcohol copolymer;

[0140] Preparation of reinforcing layer material: 70 parts by weight of modified ethylene-vinyl alcohol copolymer and 30 parts by weight of polyamide-imide were extruded in a twin-screw extruder to obtain the reinforcing layer material;

[0141] Preparation of heat-resistant layer material: 13 parts by weight of alumina and 5 parts by weight of magnesium oxide were added to 35 parts by weight of water, stirred at 1500 r / min for 1.5 h, and then sonicated at 100 kHz for 2.3 h to obtain heat-resistant layer material;

[0142] Preparation of heat-sealing layer material: 27 parts by weight of chlorinated polypropylene, 35 parts by weight of modified ethylene-vinyl alcohol copolymer, 13 parts by weight of polyphenylene sulfide and 1 part by weight of calcium stearate were extruded in a twin-screw extruder to obtain heat-sealing layer material.

[0143] Preparation of barrier layer material: 23 parts by weight of ethylene-vinyl alcohol copolymer, 35 parts by weight of high-density polyethylene and 13 parts by weight of polyether ether ketone resin were extruded in a twin-screw extruder to obtain barrier layer material;

[0144] By weight, the base layer material consists of 42% high-density polyethylene and 58% low-density polyethylene, the aluminized layer material consists of 5% alumina and 95% polyethylene, the connecting layer material is ethylene-acrylic acid copolymer, and the protective layer material is polyurethane.

[0145] Preparation of high-temperature resistant and high-barrier composite film: The above-mentioned base layer material, connecting layer material, reinforcing layer material, aluminized layer material and protective layer material are sequentially added to a five-layer co-extrusion blown film line to obtain a precursor A, which includes a base layer, connecting layer, reinforcing layer, aluminized layer and protective layer. A heat-resistant layer material is coated on the outer surface of the base layer of the precursor A to obtain layer A. The barrier layer material is blow-molded to obtain layer B. The heat-sealing layer material is blow-molded to obtain layer C. Layers A, B and C are bonded together with polyimide adhesive to obtain a composite film, wherein layer A is 20μm, layer B is 10μm, layer C is 10μm, heat-resistant layer is 2μm, base layer is 10μm, connecting layer is 1μm, reinforcing layer is 3μm, aluminized layer is 2μm and protective layer is 2μm.

[0146] The composite membranes obtained in Examples 1-5 and Comparative Examples 1-3 were tested, and the results are shown in Table 1.

[0147] Oxygen and nitrogen permeability were tested at 23°C and 0% relative humidity.

[0148] Water vapor transmission rate was tested according to GB / T26253-2010;

[0149] Table 1: Performance Results

[0150]

[0151] As shown in Table 1, the high-barrier composite packaging film provided by this invention exhibits excellent barrier properties due to the following: the reinforcing layer material includes modified ethylene-vinyl alcohol copolymer and polyamide-imide; the barrier layer material includes modified ethylene-vinyl alcohol copolymer, high-density polyethylene, and polyetheretherketone resin; and the heat-sealing layer material includes chlorinated polypropylene, modified ethylene-vinyl alcohol copolymer, polyphenylene sulfide, and calcium stearate. Furthermore, the modified ethylene-vinyl alcohol copolymer is prepared using materials including ethylene-vinyl alcohol copolymer, 7-chloro-6-fluoro-1-p-fluorophenyl-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid, 1,1-bis(trifluoromethyl)-2,2,3,3,3,3-pentafluoropropyl 2-fluoroacrylate, and acetone. Specifically, its water vapor permeability is as low as 0.45 g / (m²). 2 For days at or below, oxygen permeability is as low as 3.67 cm. 3 / (m 2 At pressures of 0.1 MPa and below, nitrogen permeability is as low as 1.63 cm. 3 / (m 2 •day •0.1MPa) and below; specifically, because 7-chloro-6-fluoro-1-p-fluorophenyl-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid and 1,1-bis(trifluoromethyl)-2,2,3,3,3,3-pentafluoropropyl 2-fluoroacrylate themselves have multifunctional groups, their fluorine groups, chlorine groups, benzene rings, nitrogen-containing rings, carboxyl groups, alkenyl groups and ester groups are connected in multiple dimensions. Furthermore, some groups are connected with ethylene-vinyl alcohol copolymers, thereby making the modified ethylene-vinyl alcohol copolymers more dense in molecular size and significantly enhancing their barrier properties. Therefore, the high-barrier composite film for packaging prepared from it has excellent barrier performance.

[0152] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0153] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A high-barrier composite film for packaging, characterized in that, It consists of layers A, B, and C in that order; The A layer comprises, in sequence, a heat-resistant layer, a base layer, a connecting layer, a reinforcing layer, an aluminum-plated layer, and a protective layer; Layer B is a barrier layer; The C layer is a heat-sealing layer; The heat-resistant layer is prepared from a heat-resistant layer material, and the raw materials for preparing the heat-resistant layer material include aluminum oxide and magnesium oxide. The reinforcing layer is prepared from a reinforcing layer material, the raw materials for which the reinforcing layer material is prepared include modified ethylene-vinyl alcohol copolymer and polyamide imide; The barrier layer is prepared from a barrier layer material, the raw materials for which include modified ethylene-vinyl alcohol copolymer, high-density polyethylene and polyetheretherketone resin. The heat-sealing layer is prepared from a heat-sealing layer material, the raw materials for which include chlorinated polypropylene, modified ethylene-vinyl alcohol copolymer, polyphenylene sulfide, and calcium stearate. The raw materials for preparing the modified ethylene-vinyl alcohol copolymer include an ethylene-vinyl alcohol copolymer in a mass ratio of 60~70:3~7:3~7:20~30, 7-chloro-6-fluoro-1-p-fluorophenyl-1,4-dihydro-4-oxo-3-quinoline carboxylic acid, 1,1-bis(trifluoromethyl)-2,2,3,3,3-pentafluoropropyl 2-fluoroacrylate, and acetone; The preparation method of the modified ethylene-vinyl alcohol copolymer includes the following steps: The ethylene-vinyl alcohol copolymer was added to the acetone, and then sonicated at a frequency of 80-120 kHz for 15-25 min. Then, the 7-chloro-6-fluoro-1-p-fluorophenyl-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid and the 1,1-bis(trifluoromethyl)-2,2,3,3,3-pentafluoropropyl 2-fluoroacrylate were added, and the mixture was stirred at a speed of 800-1000 r / min until homogeneous. The mixture was then heated to 85-95 °C and sealed for reaction for 2.3-2.7 h. The reaction was then stopped and cooled to room temperature. The product was then removed and dried at 80-90 °C to obtain the modified ethylene-vinyl alcohol copolymer.

2. The high-barrier composite film for packaging according to claim 1, characterized in that, The base layer is prepared from a base layer material, which, by mass ratio, comprises 35-50% high-density polyethylene and 50-65% low-density polyethylene.

3. The high-barrier composite film for packaging according to claim 1, characterized in that, The connecting layer is prepared from a connecting layer material, which 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-barrier composite film for packaging according to claim 1, characterized in that, The aluminum plating layer is prepared from an aluminum plating layer material, which, by mass ratio, comprises 3-7% aluminum oxide and 93-97% polyethylene, and the protective layer material is polyurethane.

5. The high-barrier composite film for packaging according to claim 1, characterized in that, The method for preparing the reinforcing layer material includes the following steps: The modified ethylene-vinyl alcohol copolymer and polyamide-imide are extruded in a twin-screw extruder to obtain the reinforcing layer material; The mass ratio of the modified ethylene-vinyl alcohol copolymer to the polyamide imide is 65~75:25~35.

6. The high-barrier composite film for packaging according to claim 1, characterized in that, The method for preparing the heat-resistant layer material includes the following steps: The alumina and magnesium oxide are added to water and stirred at 1300-1700 r / min for 1-2 h, and then sonicated at a frequency of 80-120 kHz for 2.1-2.5 h to obtain the heat-resistant layer material. The mass ratio of alumina, magnesium oxide and water is 10~15:3~7:30~40.

7. The high-barrier composite film for packaging according to claim 1, characterized in that, The method for preparing the heat-sealing layer material includes the following steps: The chlorinated polypropylene, modified ethylene-vinyl alcohol copolymer, polyphenylene sulfide, and calcium stearate are extruded in a twin-screw extruder to obtain the heat-sealing layer material; The mass ratio of the chlorinated polypropylene, modified ethylene-vinyl alcohol copolymer, polyphenylene sulfide and calcium stearate is 25~30:30~40:10~15:0.5~1.

5.

8. The high-barrier composite film for packaging according to claim 1, characterized in that, The method for preparing the barrier layer material includes the following steps: The modified ethylene-vinyl alcohol copolymer, high-density polyethylene, and polyether ether ketone resin are extruded in a twin-screw extruder to obtain the barrier layer material; The mass ratio of the modified ethylene-vinyl alcohol copolymer, high-density polyethylene, and polyetheretherketone resin is 20~25:30~40:10~15.

9. A method for preparing a high-barrier composite film for packaging, characterized in that, The preparation method is used to prepare the high-barrier composite film for packaging as described in any one of claims 1 to 8, and includes the following steps: The base layer material, connecting layer material, reinforcing layer material, aluminized layer material and protective layer material are sequentially added to a five-layer co-extrusion blown film line to obtain a layer A precursor including a base layer, connecting layer, reinforcing layer, aluminized layer and protective layer. A heat-resistant layer material is coated or sprayed onto the outer surface of the base layer of the layer A precursor to obtain layer A. The barrier layer material is blow-molded to obtain layer B; Layer C is obtained by blow molding the heat-sealing layer material; Layers A, B, and C are bonded together using a polyimide adhesive to obtain the high-barrier composite film for packaging. The thickness of the base layer is 45-55% of the total thickness of layer A, the thickness of the connecting layer is 5-15% of the total thickness of layer A, the thickness of the reinforcing layer is 5-15% of the total thickness of layer A, the thickness of the aluminum plating layer is 5-15% of the total thickness of layer A, the thickness of the protective layer is 5-15% of the total thickness of layer A, and the thickness of the heat-resistant layer is 5-15% of the total thickness of layer A. The thickness ratio of the A, B and C layers is 15~25:5~15:5~15.

Images