CN112959785B - High-barrier PET-Al-PA-PE composite film and preparation method thereof - Google Patents
High-barrier PET-Al-PA-PE composite film and preparation method thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
- B32B15/088—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyamides
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- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
- B32B15/09—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyesters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
- B32B37/1284—Application of adhesive
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
- B32B2037/243—Coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/26—Polymeric coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/31—Heat sealable
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
- B32B2307/7244—Oxygen barrier
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
- B32B2307/7246—Water vapor barrier
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/80—Medical packaging
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Abstract
The invention discloses a high-barrier PET-Al-PA-PE composite film and a preparation method thereof, wherein a PET protective layer, an Al barrier layer, a PA barrier layer and a PE heat sealing layer are sequentially arranged on the PET-Al-PA-PE composite film from outside to inside, and the raw materials of the PA barrier layer comprise polyamide, ethylene-vinyl alcohol copolymer and fluorocarbon surfactant; the raw materials of the PE heat sealing layer comprise metallocene polyethylene and ethylene propylene copolymer; the PA barrier layer is used for coating a metallocene polyethylene transition layer on the contact surface of the PA barrier layer and the PE heat sealing layer. The PA layer is additionally arranged between the Al foil layer and the PE layer to improve the barrier property of the Al foil layer, the composition of the PE layer and the composition of the PA layer are correspondingly optimized, and a novel PE layer and PA layer compounding method is provided to ensure the barrier property and the heat sealing property at the same time.
Description
Technical Field
The invention relates to the technical field of medical packaging materials, in particular to a high-barrier PET-Al-PA-PE composite film and a preparation method thereof.
Background
Most of the current liquid medicines are stored in glass bottles or plastic bottles, but the glass bottles are fragile and heavy, and the plastic bottles are mostly formed by compound hard sheets through plastic suction, and are generally formed by one-time plastic suction and arranged together, so that the plastic bottles connected together are firstly separated when the medicines are taken, and then the bottle caps are unscrewed to take the medicines, and the bottle opening is also troublesome.
With the improvement of packaging requirements of people, liquid medicine packaging bags slowly appear, flexible packages contain liquid medicines, and the requirements on the barrier property of the flexible packages are high, so that a multilayer composite film is generally adopted, on one hand, the heat sealability is increased, on the other hand, the barrier property is increased, at least three layers of structures, namely an outer layer, a barrier layer and a heat sealing layer, are commonly used at present, and representative composite films comprise PET-Al-CPP and PET-Al-PE.
In the prior art, an inner layer, namely a heat sealing layer PE or CPP, which is in direct contact with liquid medicine is generally improved so as to improve the barrier property of the inner layer. The barrier property is an important project for inspecting the quality of the protective property of the composite film for packaging the medicine, and the quality of the barrier property is directly related to whether the requirement of the moisture-proof property of the medicine can be met or not and the problem of the storage quality of the medicine, so that research and development of a new film material with better barrier property is an important subject.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention provides a PET-Al-PA-PE composite film with high barrier property and a preparation method thereof, which are used for solving the problems.
The invention is realized by the following technical scheme:
a high-barrier PET-Al-PA-PE composite film is sequentially provided with a PET protective layer, an Al barrier layer, a PA barrier layer and a PE heat sealing layer from outside to inside,
the raw materials of the PA barrier layer comprise polyamide, ethylene-vinyl alcohol copolymer and fluorocarbon surfactant;
the raw materials of the PE heat sealing layer comprise metallocene polyethylene and ethylene propylene copolymer;
the PA barrier layer is used for coating a metallocene polyethylene transition layer on the contact surface of the PA barrier layer and the PE heat sealing layer.
More preferably, the mole fraction of ethylene in the ethylene-vinyl alcohol copolymer is 20-30%, and the mole fraction of vinyl alcohol is 70-80%.
Preferably, the fluorocarbon surfactant is an anionic fluorocarbon surfactant.
More preferably, the raw materials of the PA barrier layer comprise, by weight, 100 parts of polyamide and 10-25 parts of ethylene-vinyl alcohol copolymer, and 1-5 parts of fluorocarbon surfactant.
Further preferably, the raw materials of the PE heat sealing layer comprise, by weight, 100 parts of metallocene polyethylene and 5-30 parts of ethylene-propylene copolymer.
A preparation method of a high-barrier PET-Al-PA-PE composite film is used for preparing the high-barrier PET-Al-PA-PE composite film, and comprises the following steps:
step 11: polyamide, ethylene-vinyl alcohol copolymer and fluorocarbon surfactant are blended, melted and extruded to obtain a PA barrier layer; spraying metallocene polyethylene coating when the surface of the PA barrier layer, which is in contact with the PE heat-sealing layer, is dried to 60-80%;
step 12: blending, melting and extruding metallocene polyethylene and ethylene-propylene copolymer to obtain a PE heat sealing layer;
step 13: and (3) bonding and fixing the PA barrier layer and the PE heat sealing layer through an adhesive to obtain the PA-PE composite membrane.
More preferably, in the PA-PE film layer, the ratio of the thickness of the PA layer, the thickness of the metallocene polyethylene layer, and the thickness of the PE heat-seal layer is, in order: 1:0.1-0.3:1-4.
Further preferably, the raw materials of the adhesive are a polyurethane adhesive main agent, a polyurethane adhesive curing agent and an ethylene-propylene copolymer auxiliary agent; and the raw material proportion is satisfied: the main agent of the polyurethane adhesive is polyurethane adhesive curing agent, and the auxiliary agent of ethylene-propylene copolymer = 1.
Further preferably, the method comprises the following steps:
step 1: compounding PET and aluminum foil through a first adhesive to obtain a PET-AL composite film;
and 2, step: compounding the PET-Al composite film obtained in the step 1 with a PA-PE composite film obtained by a method for preparing the PA-PE composite film through a second adhesive;
and step 3: and (5) curing.
The invention has the following advantages and beneficial effects:
at present, barrier performance is an important item for inspecting the quality of protection properties of a composite film for packaging medicines, and the quality of the barrier performance is directly related to whether the requirement of the humidity resistance of the medicines can be met or not and is directly related to the problem of the storage quality of the medicines. In the prior art, an inner layer, namely a heat sealing layer PE or CPP, which is in direct contact with liquid medicine is generally improved so as to improve the barrier property of the inner layer; the PA layer is additionally arranged between the Al foil layer and the PE layer to improve the barrier property of the Al foil layer and correspondingly optimize the composition of the PE layer and the composition of the PA layer, and the novel PE layer and PA layer compounding method is provided to improve the bonding property of the PE layer and the heat sealing property of the PE layer, reduce the influence of heat sealing on the performance of the PA layer, ensure that the PE layer and the PA layer have good bonding strength and improve the barrier property.
PET refers to polyester material, which is known as Polyethylene terephthalate in English and commonly called polyester resin; al is an aluminum foil material; PA is Polyamide, commonly called nylon, and English name polyamine; PE refers to polyethylene material.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limitations of the present invention.
Example 1
This embodiment provides a high barrier nature PET-Al-PA-PE complex film, sets gradually PET inoxidizing coating, al barrier layer, PA barrier layer and PE heat-seal layer outside-in:
the raw materials of the PA barrier layer comprise polyamide, ethylene-vinyl alcohol copolymer and fluorocarbon surfactant. Wherein, the mole fraction of ethylene in the ethylene-vinyl alcohol copolymer is 22-25%, and the mole fraction of vinyl alcohol is 75-78%; the fluorocarbon surfactant is perfluoroalkyl ether alcohol amine salt type anion fluorocarbon surfactant. The raw materials comprise, by weight, 100 parts of polyamide, 18 parts of ethylene-vinyl alcohol copolymer and 4 parts of fluorocarbon surfactant.
The raw materials of the PE heat sealing layer comprise metallocene polyethylene and ethylene propylene copolymer; the raw materials comprise, by weight, 100 parts of metallocene polyethylene and 15 parts of ethylene-propylene copolymer.
The PA barrier layer is used for coating a metallocene polyethylene transition layer on the contact surface with the PE heat seal layer.
The high-barrier PET-Al-PA-PE composite membrane is prepared by the following method:
step 1: polyamide, ethylene-vinyl alcohol copolymer and fluorocarbon surfactant are blended, melted and extruded to obtain a PA barrier layer; spraying metallocene polyethylene coating when the surface of the PA barrier layer, which is in contact with the PE heat-sealing layer, is dried to 60-80%;
step 2: blending, melting and extruding metallocene polyethylene and ethylene propylene copolymer to obtain a PE heat sealing layer;
and step 3: and (3) bonding and fixing the PA barrier layer and the PE heat sealing layer by an adhesive to obtain the PA-PE composite film.
In the PA-PE film layer, the thickness ratio of the PA layer to the metallocene polyethylene layer to the PE heat sealing layer is as follows: 1:0.2:3. The raw materials of the adhesive are a polyurethane adhesive main agent, a polyurethane adhesive curing agent and an ethylene-propylene copolymer auxiliary agent; and the raw material proportion is satisfied: the main agent of the polyurethane adhesive is polyurethane adhesive curing agent, and the auxiliary agent of ethylene-propylene copolymer =1: 0.05; adjusting the viscosity of the adhesive to 13S by using ethyl acetate, and controlling the sizing amount to be 2.5g/m 2 。
And 4, step 4: compounding PET and aluminum foil through a first adhesive to obtain a PET-AL composite film; the first adhesive adopts 78 percent of a main agent GM8160 of a polyurethane adhesive and 22 percent of a curing agent GM8160B of the polyurethane adhesive, adopts ethyl acetate to adjust the viscosity to 15PaS, and controls the glue amount to be 5.0g/m 2 。
And 5: compounding the PET-Al composite film obtained in the step (1) with the PA-PE composite film prepared in the step (3) through a second adhesive; the second adhesive adopts 78 percent of main agent GM8160 of polyurethane adhesive and 22 percent of curing agent GM8160B of polyurethane adhesive, adopts ethyl acetate to adjust the viscosity to 14PaS and controls the glue amount to be 4.5g/m 2 。
And 6: and (5) curing.
And curing the composite membrane for 96 hours at the temperature of 45 +/-3 ℃.
Example 2
This example differs from example 1 in that: the PE heat sealing layer comprises 100 parts by weight of polyamide and 18 parts by weight of ethylene-vinyl alcohol copolymer, and is free of surfactant.
Example 3
This example differs from example 1 in that: the raw material of the PA barrier layer comprises only polyamide; the raw material of the PE heat seal layer only comprises metallocene polyethylene.
Example 4
This example differs from example 1 in that: and carrying out tape casting and co-extrusion on the PA layer, the metallocene polyethylene layer and the PE heat-sealing layer to obtain the PA-PE composite film layer.
Example 5
This example differs from example 1 in that: the PA layer is directly compounded with the PE heat-sealing layer through an adhesive.
Performance test
The composite membranes prepared in examples 1-5 above were tested for performance as follows:
1. test method
1. Water vapor transmission amount (bag): taking a proper amount of the composite film product, placing the composite film product in a heat sealing instrument, and sealing three edges of the bag at the heat sealing temperature of 150-170 ℃, the pressure of 0.2-0.3MPa and the time of 1 second. The bag was thermoformed into (10 + -0.5 cm). + (5 + -0.25 cm) three-sided rectangular heat-sealed bags. And (4) filling 8ml-20ml of water, draining the air, and thermally sealing the fourth side. Preparing 8 bags in the same way, placing for 14 days according to a water vapor transmission method (YBB 00092003) and a third method (1) under the conditions of the temperature of 40 +/-2 ℃ and the relative humidity of 25 +/-5 percent, and calculating to obtain the finished product.
The water vapor transmission amount is an important index for inspecting the moisture resistance of the composite membrane, the filling quantity difference of the medicine can be ensured to be qualified by controlling the index, and the effective components of the medicine are not volatilized.
2. Oxygen transmission amount: a composite film product is taken and subjected to the first method or the second method of the gas permeability measurement method (YBB 00082003-2015). The oxygen transmission amount is an important index for inspecting the composite membrane, the gas barrier property of the composite membrane is ensured by controlling the index, the oxidation reaction of the medicine is avoided, and the stability of the medicine quality can be effectively controlled.
3. Peeling strength of the Al layer and the PA layer: taking the composite film product, and checking according to a method of a standard peel strength determination method (YBB 00102003-2015) published by the State food and drug administration. The peel strength of the Al layer and the PA layer was examined whether the packaging material ensured the adhesion strength and the adhesive application uniformity during the production process.
4. Heat seal strength: taking a composite film product, cutting four 100mm-100 mm test pieces, superposing the composite film surfaces of any two test pieces, placing the composite film surfaces on a heat sealing instrument for heat sealing (the heat sealing temperature is 150-170 ℃, the pressure is 0.2-0.3MPa, and the time is 1 second), and detecting according to a heat sealing strength measuring method (YBB 00122003-2015). The heat seal strength is used for investigating the strength of the sealing position of the composite film and the bag after charging, and is directly related to the protection capability of the packaging material for the packaged medicine.
5. Stability test
The stability of the product is examined according to the guidance principle of stability research on plastic and rubber medicine bag materials (survey of comments). And (3) accelerating equivalent conditions by adopting a guiding principle, selecting 60 ℃/10% in the experiment, and investigating 0d/20d/40d/60d/80d/96d. Specific temperature and humidity setting: 60 ℃. + -. 2 ℃/10%. + -. 5% RH.
2. Test results
1. Results of barrier and strength Properties testing
Table 1 results of performance test of composite membranes prepared in examples 1 to 5
| Sample numbering | Water vapor barrier property | Oxygen barrier property | Heat seal strength | Peeling strength of Al layer and PA layer |
| Example 1 | 0.2％ | 0.08 | 61/58 | 9.1/10.8 |
| Example 2 | 0.5％ | 0.32 | 58/54 | 8.7/7.5 |
| Example 3 | 1.2％ | 0.63 | 49/50 | 6.9/7.7 |
| Example 4 | 0.7％ | 0.45 | 53/50 | 9.0/8.8 |
| Example 5 | 0.4％ | 0.26 | 57/57 | 10.0/10.3 |
Remarking: the unit of each performance index is as follows:
water vapor barrier property, i.e. water vapor transmission capacity, g/(m) 2 ·24h)；
Oxygen barrier properties, i.e. oxygen transmission capacity, cm 3 /(m 2 ·24h·0.1MPa)；
The peel strength of the AL layer and the PA layer is N/15mm (longitudinal/transverse direction);
heat seal strength N/15mm (machine direction/transverse direction);
2. stability test results
Table 2 composite membrane stability test results prepared in example 1
| Investigation time | Water vapor barrier property | Oxygen barrier property | Heat seal strength | Peeling strength of Al layer and PA layer |
| 0d | 0.2％ | 0.08 | 61/58 | 9.1/10.8 |
| 20d | 0.2％ | 0.08 | 60/59 | 9.1/10.6 |
| 40d | 0.2％ | 0.08 | 61/57 | 9.0/10.7 |
| 60d | 0.2％ | 0.09 | 60/58 | 9.0/10.6 |
| 80d | 0.3％ | 0.09 | 60/58 | 8.8/10.6 |
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A PET-Al-PA-PE composite film with high barrier property is sequentially provided with a PET protective layer, an Al barrier layer, a PA barrier layer and a PE heat sealing layer from outside to inside, and is characterized in that,
the raw materials of the PA barrier layer comprise polyamide, ethylene-vinyl alcohol copolymer and fluorocarbon surfactant; 100 parts of polyamide, 18 parts of ethylene-vinyl alcohol copolymer and 4 parts of fluorocarbon surfactant; the fluorocarbon surfactant is perfluoroalkyl ether alcohol amine salt type anionic fluorocarbon surfactant;
the raw materials of the PE heat sealing layer comprise metallocene polyethylene and ethylene propylene copolymer; 100 parts of metallocene polyethylene and 15 parts of ethylene-propylene copolymer by weight;
the surface of the PA barrier layer, which is in contact with the PE heat-sealing layer, is coated with a metallocene polyethylene transition layer.
2. The high-barrier PET-Al-PA-PE composite film according to claim 1, wherein the ethylene-vinyl alcohol copolymer comprises 20-30 mol% of ethylene and 70-80 mol% of vinyl alcohol.
3. A method for preparing a high-barrier PET-Al-PA-PE composite film according to any one of claims 1 to 2, comprising the steps of:
step 11: polyamide, ethylene-vinyl alcohol copolymer and fluorocarbon surfactant are blended, melted and extruded to obtain a PA barrier layer; spraying metallocene polyethylene coating when the surface of the PA barrier layer, which is in contact with the PE heat-sealing layer, is dried to 60-80%;
step 12: blending, melting and extruding metallocene polyethylene and ethylene propylene copolymer to obtain a PE heat sealing layer;
step 13: and (3) bonding and fixing the PA barrier layer and the PE heat sealing layer by an adhesive to obtain the PA-PE composite film.
4. The preparation method of claim 3, wherein in the PA-PE composite film layer, the thickness ratio of the PA layer, the metallocene polyethylene layer and the PE heat sealing layer is as follows: 1:0.1-0.3:1-4.
5. The preparation method of claim 3, wherein the raw materials of the adhesive are a polyurethane adhesive main agent, a polyurethane adhesive curing agent and an auxiliary agent ethylene-propylene copolymer; and the raw material ratio meets the following requirements: the main agent of the polyurethane adhesive, the curing agent of the polyurethane adhesive, the auxiliary agent ethylene-propylene copolymer = 1.
6. The method of claim 3, comprising the steps of:
step 1: compounding PET and aluminum foil through a first adhesive to obtain a PET-Al composite film;
step 2: compounding the PET-Al composite film obtained in the step 1 with a PA-PE composite film obtained by a method for preparing the PA-PE composite film through a second adhesive;
and 3, step 3: and (5) curing.
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| CN102431258B (en) * | 2011-09-01 | 2014-04-30 | 广州市得力仕食品包装有限公司 | Multilayer heat shrinkage film |
| CN103203919B (en) * | 2013-02-22 | 2015-04-22 | 浙江诚信包装材料有限公司 | High-barrier semi-high temperature cooking liquid packaging material and packaging bag made of the same |
| CN104497738B (en) * | 2015-01-04 | 2016-08-31 | 河南科技大学 | A kind of bonded solid lubricant coating, preparation method and self-lubricating knuckle bearing, preparation method |
| CN210851583U (en) * | 2019-07-26 | 2020-06-26 | 江阴苏达汇诚复合材料有限公司 | A easily tear type plastic-aluminum epiphragma for cosmetics apron |
| CN111688320A (en) * | 2020-06-06 | 2020-09-22 | 湖北富思特材料科技集团有限公司 | Extrusion composite low-temperature heat-sealing shrinkage tobacco film |
| CN112009056A (en) * | 2020-08-21 | 2020-12-01 | 河北永新包装有限公司 | Active dry yeast powder composite packaging film and preparation method thereof |
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2021
- 2021-03-22 CN CN202110301365.8A patent/CN112959785B/en active Active
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