CN113629327A - Lithium battery flexible package aluminum-plastic film material and preparation method thereof - Google Patents
Lithium battery flexible package aluminum-plastic film material and preparation method thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
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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
- B32B15/04—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
- B32B15/085—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 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
- 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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- 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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- 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
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- 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
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
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- 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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- 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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- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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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
- B32B2307/304—Insulating
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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
- B32B2307/306—Resistant to heat
- B32B2307/3065—Flame resistant or retardant, fire resistant or retardant
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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
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/558—Impact strength, toughness
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2467/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/346—Clay
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
Abstract
The invention relates to the technical field of composite films, in particular to a lithium battery flexible package aluminum-plastic film material and a preparation method thereof, and is characterized in that the aluminum-plastic film material comprises a PA film layer, an aluminum foil layer and a CPP film layer which are sequentially stacked, an outer adhesive layer for bonding the PA film layer and the aluminum foil layer and an inner adhesive layer for bonding the aluminum foil layer and the CPP film layer; the outer glue film is bonded between the PA film layer and the aluminum foil layer, and the inner glue film is bonded between the aluminum foil layer and the CPP film layer. The aluminum-plastic film material provided by the invention has the advantages of high strength, strong rigidity, good heat insulation and flame retardant effects, and is worthy of popularization and application.
Description
Technical Field
The invention relates to the technical field of composite films, in particular to a lithium battery flexible package aluminum-plastic film material and a preparation method thereof.
Background
With the development of society, a series of electronic devices such as smart phones and tablet computers play an increasingly important role in the life of people. With the development of technology, the thickness of these electronic devices is becoming thinner and thinner, and higher requirements are also being placed on the size of the battery loaded therein.
The power storage modules mounted on these electronic devices, particularly lithium ion batteries, are coated with an outer casing. The aluminum plastic film is used as an important packaging material for flexible packaging of electric storage equipment such as a lithium battery and the like, and has good application value. The conventional aluminum-plastic film material generally includes a heat-resistant resin film, a metal aluminum foil and a thermoplastic resin film, which are sequentially disposed, and the heat-resistant resin film and the metal aluminum foil, and the thermoplastic resin film and the metal aluminum foil are bonded by an adhesive respectively.
Chinese patent publication No. CN107150477A discloses an outer cover for an electricity storage device, which comprises a polyamide resin layer as an outer layer, a polyolefin resin layer as an inner layer, and an aluminum foil layer disposed between the two layers, wherein the outer cover for an electricity storage device has a thickness of 90 μm or less, the outer cover for an electricity storage device has a tensile strength of 110N/15mm width or more, and the outer cover for an electricity storage device has a tensile elongation at break of 90% or more. In addition, although the packaging material has a small thickness, the barrier property and flame retardancy are poor, and the adhesiveness between the film layers of the formed packaging material is poor.
The invention patent with publication number CN110757905A discloses an aluminum plastic film for lithium battery flexible packaging material and a surface treatment method of metal aluminum foil thereof, the surface treatment method comprises the step of treating the surface of the metal aluminum foil by adopting surface treatment liquid, and the raw material formula of the surface treatment liquid comprises the following components: 1g/m3～1000g/m3Polymer resin, 0.1g/m3～500g/m3Phosphoric acid, 0.1g/m3～1000g/m3Chromic acid, 0.1g/m3～1000g/m3Fluorine-containing metal salt and water. This lithium cell plastic-aluminum membrane for soft packaging material, including heat resistance resin film, metal aluminium foil and the thermoplastic resin film that sets gradually, bond its characterized in that through the adhesive between heat resistance resin film and the metal aluminium foil, respectively between thermoplastic resin film and the metal aluminium foil: the metal aluminum foil is treated by the surface treatment method. The technical scheme adopts specific surface treatment liquid to carry out surface treatment on the metal aluminum foil, and a chemical film is formed on the surface of the metal aluminum foil, so that the corrosion resistance of the metal aluminum foil is greatly improved, and the adhesive is adhered on the surface of the metal aluminum foilThereby improving the bonding performance with the non-metal film. However, the aluminum plastic film for the lithium battery flexible packaging material prepared by the method has poor barrier, flame retardant and heat insulation performance, and the raw materials and the preparation process are complicated.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a lithium battery flexible package aluminum-plastic film material and a preparation method thereof.
In order to achieve the purpose, the invention provides the following technical scheme: a flexible packaging aluminum plastic film material for a lithium battery comprises a PA film layer, an aluminum foil layer and a CPP film layer which are sequentially stacked, and an outer adhesive layer for bonding the PA film layer and the aluminum foil layer and an inner adhesive layer for bonding the aluminum foil layer and the CPP film layer; the outer glue film is bonded between the PA film layer and the aluminum foil layer, and the inner glue film is bonded between the aluminum foil layer and the CPP film layer.
Preferably, the PA film layer comprises the following components in parts by weight: 82-90 parts of polyamide resin, 7-13 parts of polyethylene terephthalate, 0.8-2 parts of a compatilizer and 2-5 parts of modified montmorillonite.
Preferably, the modified montmorillonite is prepared by the following method:
a1: mixing 70-100 parts by mass of absolute ethyl alcohol, 50-100 parts by mass of deionized water and 1-5 parts by mass of acetic acid to form a mixed solution;
a2: adding 0.5-2 parts of silane coupling agent into the mixed solution, stirring, adding 20-30 parts of montmorillonite, and continuously stirring for 24 hours at 70 ℃ to obtain a crude product;
a3, washing the crude product with absolute ethyl alcohol at room temperature, filtering and drying to obtain the product modified montmorillonite.
Preferably, the silane coupling agent is gamma-aminopropyltriethoxysilane.
Preferably, the outer glue layer is polyurethane glue.
Preferably, the inner glue layer is polyurethane adhesive.
Preferably, the compatibilizing agent is HyPer C100 resin.
The invention also provides a method for preparing the lithium battery flexible packaging aluminum-plastic film material, which comprises the following steps:
s1: the preparation method of the PA film layer comprises the following specific steps:
s1.1: weighing polyamide resin, polyethylene glycol terephthalate, a compatilizer and modified montmorillonite according to the proportion, and adding the weighed materials into a mixing roll to mix and stir to form a mixture;
s1.2: adding ethanol into the mixture, stirring, and then adding into an extruder for melt blending, extrusion and granulation; the mass part ratio of the ethanol to the mixture is 1: 5-7;
s1.3: adding the particles extruded in the step S1.2 into a casting machine for casting to form a film, and preparing a PA film layer;
s2: coating the outer layer glue on the surface of the PA film layer, drying through a drying tunnel, then adhering to the upper surface of the aluminum foil layer, compacting and curing;
s3: and coating the inner layer adhesive on the surface of the CPP film layer, drying through a drying tunnel, then laminating with the lower surface of the aluminum foil layer, compacting and curing to obtain the lithium battery flexible package aluminum-plastic film material.
Preferably, the aluminum foil layer is a 1-series aluminum foil or an 8-series aluminum foil of which the surface is chemically converted, and the chemical conversion treatment includes the following steps:
g1: cleaning the surface of the aluminum foil raw material for later use;
g2: preparing a chemical conversion agent comprising the following components in concentration: h3PO410ml/L、NH4HF23g/L、K2TiF61g/L、Na2WO41g/L, EDTA-2Na 1g/L, and adjusting the pH value of the chemical conversion agent to 4.2-4.8; g3, immersing the aluminum foil to be used in a chemical conversion agent for chemical conversion to form a film, wherein the conversion temperature is 37-42 ℃, and the conversion time is 20-35 min.
Preferably, the coating thickness of the outer layer glue is 1-5 μm, and the coating thickness of the inner layer glue is 1-5 μm.
The beneficial effects of the invention at least comprise: the lithium battery flexible package aluminum-plastic film material provided by the invention has the advantages of strong barrier property, strong puncture resistance and electrolyte resistance stability, and good flame retardant and heat insulation effects. Specifically, the barrier property of the PA film layer is enhanced by adding polyethylene terephthalate and HyPer C100 resin into the PA film layer; the corrosion resistance and the film adhesion capability of the film are improved by carrying out chemical conversion treatment on the surface of the aluminum foil layer, so that the aluminum foil layer, the PA film and the CPP film have better binding capability, and the service life of the aluminum-plastic film is prolonged; through the combination with the CPP rete, greatly increased this plastic-aluminum membrane material's heat sealability and high barrier properties. The aluminum-plastic film material has the advantages of simple preparation process, easily obtained raw materials, easy mass production and suitability for popularization and application.
Drawings
Fig. 1 is a schematic structural diagram of an aluminum plastic film material for a flexible package of a lithium battery in the invention.
Wherein: 1-PA film layer, 2-outer adhesive layer, 3-aluminum foil layer, 4-inner adhesive layer and 5-CPP film layer.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
A lithium battery flexible package aluminum-plastic film material comprises a PA film layer 1, an aluminum foil layer 3 and a CPP film layer 5 which are sequentially stacked, an outer adhesive layer 2 for bonding the PA film layer 1 and the aluminum foil layer 3, and an inner adhesive layer 4 for bonding the aluminum foil layer 3 and the CPP film layer 5; the outer adhesive layer 2 is bonded between the PA film layer 1 and the aluminum foil layer 3, and the inner adhesive layer 4 is bonded between the aluminum foil layer 3 and the CPP film layer 5; the outer glue layer 2 is polyurethane glue; the inner glue layer 4 is polyurethane adhesive.
In this embodiment, the PA film layer 1 includes the following components in parts by mass: 86 parts of polyamide resin, 10 parts of polyethylene terephthalate, 1 part of compatilizer HyPer C100 resin and 3 parts of modified montmorillonite.
Wherein, the modified montmorillonite is prepared by the following method: firstly, mixing 85 parts by mass of absolute ethyl alcohol, 75 parts by mass of deionized water and 3 parts by mass of acetic acid to form a mixed solution; then adding 1.3 parts of silane coupling agent gamma-aminopropyl triethoxysilane into the mixed solution, stirring for 4 hours at room temperature, then adding 25 parts of montmorillonite, and continuing to stir for 24 hours at 70 ℃ to obtain a crude product; and washing the crude product with absolute ethyl alcohol at room temperature, filtering and drying to obtain the product modified montmorillonite.
A method for preparing the flexible packaging aluminum-plastic film material of the lithium battery comprises the following steps:
s1: the preparation method of the PA film layer comprises the following specific steps:
s1.1: weighing polyamide resin, polyethylene glycol terephthalate, a compatilizer and modified montmorillonite according to a proportion, and adding the weighed materials into a mixing roll to be fully mixed and stirred for 45-120 min to form a mixture;
s1.2: adding ethanol into the mixture and stirring, wherein the mass part ratio of the ethanol to the mixture is 1: 6, then adding the mixture into an extruder, melting, blending, extruding and granulating at 180-200 ℃, and then cooling for 45-90 min;
s1.3: adding the particles extruded in the step S1.2 into a casting machine, and casting at 180-210 ℃ to form a film to obtain a PA film layer;
s2: mounting a PA film layer on a laminating roller, coating an outer layer of glue on the surface of the PA film layer, wherein the coating thickness is 4 microns, then sending the PA film layer into a drying tunnel for four-section drying, then laminating and pressing the dried PA film layer and the upper surface of an aluminum foil layer, wherein the length of the drying tunnel is 8-10 m, the temperature of the first section of the drying tunnel is 60 ℃, the temperature of the second section of the drying tunnel is 70 ℃, the temperature of the third section of the drying tunnel is 80 ℃, the temperature of the fourth section is 90 ℃, the air speed in the drying tunnel is controlled at 25-30 m/s, and curing is carried out for 5 days at 50 ℃ after pressing;
s3: installing the CPP film layer on a laminating roller, coating a layer of inner layer adhesive on the surface of the CPP film layer, wherein the coating thickness is 3 microns, then sending the CPP film layer into a drying tunnel for four-section drying, then laminating and tightly pressing the dried CPP film layer and the lower surface of an aluminum foil layer, wherein the length of the drying tunnel is 9-10 m, the temperature of the first section of the drying tunnel is 55 ℃, the temperature of the second section of the drying tunnel is 65 ℃, the temperature of the third section of the drying tunnel is 75 ℃, the temperature of the fourth section of the drying tunnel is 85 ℃, the air speed in the drying tunnel is controlled at 25-30 m/s, and after the pressing is finished, curing is carried out for 5 days at 45 ℃ to obtain the lithium battery flexible packaging aluminum plastic film material.
In this embodiment, the aluminum foil layer is a 1-series aluminum foil or an 8-series aluminum foil with a surface subjected to a chemical conversion treatment, and the chemical conversion treatment includes the following steps:
g1: chemically removing oil on the surface of an aluminum foil raw material, ultrasonically cleaning the aluminum foil raw material by using distilled water or deionized water, and airing for later use;
g2: preparing a chemical conversion agent comprising the following components in concentration: h3PO410ml/L、NH4HF23g/L、K2TiF61g/L、Na2WO41g/L, EDTA-2Na 1g/L, and by adding H3PO4Adjusting the pH value of the chemical conversion agent to 4.2-4.8;
g3, immersing the aluminum foil to be used in a chemical conversion agent for chemical conversion to form a film, wherein the conversion temperature is 37-42 ℃, and the conversion time is 20-35 min.
Example 2
This example is substantially the same as example 1, except that, in this example, the PA film layer 1 includes the following components in parts by mass: 82 parts of polyamide resin, 7 parts of polyethylene terephthalate, 0.8 part of compatilizer HyPer C100 resin and 2 parts of modified montmorillonite.
Wherein, the modified montmorillonite is prepared by the following method: firstly, mixing 70 parts by mass of absolute ethyl alcohol, 50 parts by mass of deionized water and 1 part by mass of acetic acid to form a mixed solution; then 0.5 part of silane coupling agent gamma-aminopropyl triethoxysilane is added into the mixed solution and stirred for 4 hours at room temperature, then 20 parts of montmorillonite is added, and stirring is continued for 22 hours at 78 ℃ to obtain a crude product; and washing the crude product with absolute ethyl alcohol at room temperature, filtering and drying to obtain the product modified montmorillonite.
A method for preparing the flexible packaging aluminum-plastic film material of the lithium battery comprises the following steps:
s1: the preparation method of the PA film layer comprises the following specific steps:
s1.1: weighing polyamide resin, polyethylene glycol terephthalate, a compatilizer and modified montmorillonite according to the proportion, and adding the weighed materials into a mixing roll to be fully mixed and stirred for 90min to form a mixture;
s1.2: adding ethanol into the mixture and stirring, wherein the mass part ratio of the ethanol to the mixture is 1: 7, then adding the mixture into an extruder, melting, blending, extruding and granulating at 190 ℃, and then cooling for 60 min;
s1.3: adding the granules extruded in the step S1.2 into a casting machine, and casting at 200 ℃ to form a film to obtain a PA film layer;
s2: mounting a PA film layer on a laminating roller, coating an outer layer of glue on the surface of the PA film layer, wherein the coating thickness is 5 microns, then sending the PA film layer into a drying tunnel for four-section drying, then laminating and pressing the dried PA film layer and the upper surface of an aluminum foil layer, wherein the length of the drying tunnel is 10m, the temperature of the first section of the drying tunnel is 65 ℃, the temperature of the second section of the drying tunnel is 75 ℃, the temperature of the third section of the drying tunnel is 85 ℃, the temperature of the fourth section is 90 ℃, the air speed in the drying tunnel is controlled at 30m/s, and curing is carried out for 5 days at 50 ℃ after pressing is finished;
s3: mounting the CPP film layer on a laminating roller, coating a layer of inner layer adhesive on the surface of the CPP film layer, wherein the coating thickness is 5 microns, then sending the CPP film layer into a drying tunnel for four-section drying, then laminating and tightly pressing the dried CPP film layer and the lower surface of an aluminum foil layer, wherein the length of the drying tunnel is 9m, the temperature of the first section of the drying tunnel is 60 ℃, the temperature of the second section of the drying tunnel is 70 ℃, the temperature of the third section of the drying tunnel is 80 ℃, the temperature of the fourth section of the drying tunnel is 90 ℃, the air speed in the drying tunnel is controlled at 30m/s, and curing is carried out for 5 days at 50 ℃ after the tight pressing is finished, thus obtaining the aluminum plastic film material for the flexible package of the lithium battery.
In this embodiment, the aluminum foil layer is a 1-series aluminum foil or an 8-series aluminum foil with a surface subjected to a chemical conversion treatment, and the chemical conversion treatment includes the following steps:
g1: chemically removing oil on the surface of an aluminum foil raw material, ultrasonically cleaning the aluminum foil raw material by using distilled water or deionized water, and airing for later use;
g2: preparing a chemical conversion agent comprising the following components in concentration: h3PO410ml/L、NH4HF23g/L、K2TiF61g/L、Na2WO41g/L, EDTA-2Na 1g/L, and by adding H3PO4Adjusting the pH value of the chemical conversion agent to 4.6;
g3, immersing the spare aluminum foil into a chemical conversion agent for chemical conversion to form a film, wherein the conversion temperature is 40 ℃, and the conversion time is 32 min.
Example 3
This example is substantially the same as example 1, except that, in this example, the PA film layer 1 includes the following components in parts by mass: 90 parts of polyamide resin, 13 parts of polyethylene terephthalate, 2 parts of compatilizer HyPer C100 resin and 5 parts of modified montmorillonite.
Wherein, the modified montmorillonite is prepared by the following method: firstly, mixing 100 parts of absolute ethyl alcohol, 100 parts of deionized water and 5 parts of acetic acid by mass to form a mixed solution; then 2 parts of silane coupling agent gamma-aminopropyl triethoxysilane is added into the mixed solution and stirred for 5 hours at room temperature, then 30 parts of montmorillonite is added, and stirring is continued for 25 hours at 80 ℃ to obtain a crude product; and washing the crude product with absolute ethyl alcohol at room temperature, filtering and drying to obtain the product modified montmorillonite.
A method for preparing the flexible packaging aluminum-plastic film material of the lithium battery comprises the following steps:
s1: the preparation method of the PA film layer comprises the following specific steps:
s1.1: weighing polyamide resin, polyethylene glycol terephthalate, a compatilizer and modified montmorillonite according to the proportion, and adding the weighed materials into a mixing roll to be fully mixed and stirred for 86min to form a mixture;
s1.2: adding ethanol into the mixture and stirring, wherein the mass part ratio of the ethanol to the mixture is 1: 5, then adding the mixture into an extruder, melting, blending, extruding and granulating at 186 ℃, and then cooling for 68 min;
s1.3: adding the particles extruded in the step S1.2 into a casting machine, and casting at 186 ℃ to form a film to obtain a PA film layer;
s2: mounting a PA film layer on a laminating roller, coating an outer layer of glue on the surface of the PA film layer, wherein the coating thickness is 1 mu m, then sending the PA film layer into a drying tunnel for four-section drying, then laminating and pressing the dried PA film layer and the upper surface of an aluminum foil layer, wherein the length of the drying tunnel is 8m, the temperature of the first section of the drying tunnel is 55 ℃, the temperature of the second section of the drying tunnel is 65 ℃, the temperature of the third section of the drying tunnel is 75 ℃, the temperature of the fourth section is 85 ℃, the air speed in the drying tunnel is controlled at 25m/s, and curing is carried out for 4 days at 45 ℃ after pressing;
s3: installing the CPP film layer on a laminating roller, coating a layer of inner layer adhesive on the surface of the CPP film layer, wherein the coating thickness is 1 mu m, then sending the CPP film layer into a drying tunnel for four-section drying, then laminating and tightly pressing the dried CPP film layer and the lower surface of an aluminum foil layer, wherein the length of the drying tunnel is 9m, the temperature of the first section of the drying tunnel is 55 ℃, the temperature of the second section of the drying tunnel is 65 ℃, the temperature of the third section of the drying tunnel is 75 ℃, the temperature of the fourth section of the drying tunnel is 85 ℃, the air speed in the drying tunnel is controlled at 25m/s, and curing is carried out for 4 days at 45 ℃ after the pressing is finished, thus obtaining the aluminum plastic film material for the flexible package of the lithium battery.
In this embodiment, the aluminum foil layer is a 1-series aluminum foil or an 8-series aluminum foil with a surface subjected to a chemical conversion treatment, and the chemical conversion treatment includes the following steps:
g1: chemically removing oil on the surface of an aluminum foil raw material, ultrasonically cleaning the aluminum foil raw material by using distilled water or deionized water, and airing for later use;
g2: preparing a chemical conversion agent comprising the following components in concentration: h3PO410ml/L、NH4HF23g/L、K2TiF61g/L、Na2WO41g/L, EDTA-2Na 1g/L, and by adding H3PO4Adjusting the pH value of the chemical conversion agent to 4.6;
g3, immersing the aluminum foil to be used in a chemical conversion agent for chemical conversion to form a film, wherein the conversion temperature is 43 ℃, and the conversion time is 30 min.
The aluminum plastic film materials prepared in the above examples 1 to 4 were respectively packaged to prepare sample bags of 60mm × 80mm, and 3mL of electrolyte was injected, and the sample bags were closed by heat sealing, and were taken out after being kept at 85 ℃ ± 2 ℃ for 24 hours, and the sample bags were cut into sample strips of 15mm in width, and subjected to an electrolyte-resistant peel strength test at 100mm/min, and the test results are shown in table 1 below.
TABLE 1
TABLE 2 weather resistance test results
As can be seen from the above tables 1 and 2, the aluminum plastic film material prepared by the method of the present invention has not only higher peel strength, but also good barrier property, high strength and strong weather resistance.
The above embodiments are only for illustrating the invention and are not to be construed as limiting the invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention, therefore, all equivalent technical solutions also belong to the scope of the invention, and the scope of the invention is defined by the claims.
Claims (10)
1. The flexible package aluminum-plastic film material for the lithium battery is characterized by comprising a PA film layer (1), an aluminum foil layer (3) and a CPP film layer (5) which are sequentially stacked, an outer adhesive layer (2) for bonding the PA film layer (1) and the aluminum foil layer (3) and an inner adhesive layer (4) for bonding the aluminum foil layer (3) and the CPP film layer (5); outer glue film (2) bond between PA rete (1) and aluminium foil layer (3), interior glue film (4) bond between aluminium foil layer (3) and CPP rete (5).
2. The flexible package aluminum-plastic film material for the lithium battery as claimed in claim 1, wherein the PA film layer (1) comprises the following components in parts by mass: 82-90 parts of polyamide resin, 7-13 parts of polyethylene terephthalate, 0.8-2 parts of a compatilizer and 2-5 parts of modified montmorillonite.
3. The lithium battery flexible package aluminum-plastic film material as claimed in claim 2, wherein the modified montmorillonite is prepared by the following method:
a1: mixing 70-100 parts by mass of absolute ethyl alcohol, 50-100 parts by mass of deionized water and 1-5 parts by mass of acetic acid to form a mixed solution;
a2: adding 0.5-2 parts of silane coupling agent into the mixed solution, stirring, adding 20-30 parts of montmorillonite, and continuously stirring for 24 hours at 70 ℃ to obtain a crude product;
a3, washing the crude product with absolute ethyl alcohol at room temperature, filtering and drying to obtain the product modified montmorillonite.
4. The lithium battery flexible package aluminum-plastic film material as claimed in claim 3, wherein the silane coupling agent is γ -aminopropyltriethoxysilane.
5. The lithium battery flexible package aluminum-plastic film material as claimed in claim 1, wherein the outer adhesive layer (2) is polyurethane glue.
6. The flexible package aluminum-plastic film material for lithium batteries according to claim 1, wherein the inner adhesive layer (4) is a polyurethane adhesive.
7. The flexible packaging aluminum-plastic film material for lithium batteries as claimed in claim 2, wherein the compatilizer is HyPer C100 resin.
8. A method for preparing the aluminum plastic film material for the lithium battery flexible package according to claim 2, 3 or 4, which is characterized by comprising the following steps:
s1: the preparation method of the PA film layer comprises the following specific steps:
s1.1: weighing polyamide resin, polyethylene glycol terephthalate, a compatilizer and modified montmorillonite according to the proportion, and adding the weighed materials into a mixing roll to mix and stir to form a mixture;
s1.2: adding ethanol into the mixture, stirring, and then adding into an extruder for melt blending, extrusion and granulation;
s1.3: adding the particles extruded in the step S1.2 into a casting machine for casting to form a film, and preparing a PA film layer;
s2: coating the outer layer glue on the surface of the PA film layer, drying through a drying tunnel, then adhering to the upper surface of the aluminum foil layer, compacting and curing;
s3: and coating the inner layer adhesive on the surface of the CPP film layer, drying through a drying tunnel, then laminating with the lower surface of the aluminum foil layer, compacting and curing to obtain the lithium battery flexible package aluminum-plastic film material.
9. The method for preparing the aluminum-plastic film material for the flexible package of the lithium battery as claimed in claim 8, wherein the aluminum foil layer (3) is a 1-series aluminum foil or an 8-series aluminum foil with the surface being chemically converted, and the chemical conversion treatment comprises the following steps:
g1: cleaning the surface of the aluminum foil raw material for later use;
g2: preparing a chemical conversion agent comprising the following components in concentration: h3PO4 10ml/L、NH4HF2 3g/L、K2TiF61g/L、Na2WO41g/L, EDTA-2Na 1g/L, and adjusting the pH value of the chemical conversion agent to 4.2-4.8;
g3, immersing the aluminum foil to be used in a chemical conversion agent for chemical conversion to form a film, wherein the conversion temperature is 37-42 ℃, and the conversion time is 20-35 min.
10. The method for preparing the lithium battery flexible package aluminum-plastic film material as claimed in claim 8, wherein the coating thickness of the outer layer glue is 1-5 μm, and the coating thickness of the inner layer glue is 1-5 μm.
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