CN111761909A - Outer-layer film material for aluminum-plastic film, black flame-retardant aluminum-plastic film and application of black flame-retardant aluminum-plastic film - Google Patents

Outer-layer film material for aluminum-plastic film, black flame-retardant aluminum-plastic film and application of black flame-retardant aluminum-plastic film Download PDF

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CN111761909A
CN111761909A CN202010460343.1A CN202010460343A CN111761909A CN 111761909 A CN111761909 A CN 111761909A CN 202010460343 A CN202010460343 A CN 202010460343A CN 111761909 A CN111761909 A CN 111761909A
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layer
aluminum
pet
plastic film
nano
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王泰钧
雷中伟
夏旭峰
孙剑飞
许翔飞
刘拓
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Zhejiang Huazheng Energy Material Co ltd
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Zhejiang Huazheng Energy Material Co ltd
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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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
    • A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
    • 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
    • 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
    • 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
    • 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
    • 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
    • B32B27/18—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
    • 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
    • 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
    • B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
    • 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
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y40/00—Manufacture or treatment of nanostructures
    • 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
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
    • C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • 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
    • 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
    • B32B2457/00—Electrical equipment
    • B32B2457/10—Batteries
    • 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
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • 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
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • 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
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The invention belongs to the technical field of aluminum-plastic films, and particularly relates to an outer-layer film material for an aluminum-plastic film, a black flame-retardant aluminum-plastic film and application thereof. The outer layer film material for the aluminum plastic film comprises a double-layer co-extrusion PET layer, wherein the double-layer co-extrusion PET layer comprises a stacked nano carbon black modified PET film layer and a nano silicon dioxide modified PET film layer. The outer-layer film material for the aluminum-plastic film is prepared from two layers of modified PET through a double-screw extruder, has excellent character prominence, hydrolysis resistance, thermal stability, high-temperature weather resistance and flame retardant property, and is particularly suitable for the aluminum-plastic film for the lithium ion battery in a new energy automobile.

Description

Outer-layer film material for aluminum-plastic film, black flame-retardant aluminum-plastic film and application of black flame-retardant aluminum-plastic film
Technical Field
The invention belongs to the technical field of aluminum-plastic films, and particularly relates to an outer-layer film material for an aluminum-plastic film, a black flame-retardant aluminum-plastic film and application thereof.
Background
In recent years, the development of new energy automobiles is receiving attention from all the people, and various vehicle manufacturing enterprises in the world are added to the research and development of new energy automobiles. New energy vehicles such as a Yuelai vehicle and a BYD vehicle exist in China, and Tesla, the public, the Benz and the like exist abroad. At present, most of mainstream new energy automobiles use lithium ion batteries as power sources.
Currently, the mainstream lithium ion battery has the following three types of bearing forms: square, cylindrical and soft package lithium ion batteries. The soft package lithium ion battery is regarded as a lithium ion battery with great research and development prospects due to the advantages of high energy density, good safety performance, flexible design and the like.
However, the soft package lithium ion battery has the following disadvantages:
first, soft packet of lithium ion skin material is nylon material often, and it has relatively poor water-fast ability, and the heat of lithium cell module is dispeled to the liquid water-cooling mode commonly used to present soft packet of lithium cell module, therefore this water-fast ability to skin material for the plastic-aluminum membrane has proposed higher requirement.
And secondly, the working environment of the lithium ion battery module is 60-80 ℃, and because the lithium ion battery module is in a high-temperature environment for a long time, higher requirements on the high-temperature weather resistance of the outer-layer film material of the lithium ion battery are provided.
And thirdly, the lithium ion battery module has the dangerous condition of cell combustion when in use, which also puts higher requirements on the flame retardant property of the aluminum plastic film material.
Fourthly, the currently common aluminum-plastic film is silvery white, and the dyne value of the surface of the nylon material on the outer layer is low, so that the code spraying of characters is difficult when the code spraying printing is carried out on the surface of the battery; in addition, when the characters are white or a printed matter having a light color, the silver aluminum plastic film has less character prominence.
Fifthly, most of the black aluminum-plastic films on the market modify the outer layer glue used by the aluminum-plastic films, and the outer layer glue of the aluminum-plastic films is prepared into black glue, and the material of the outer layer is not changed. The black aluminum-plastic film only changes the character prominence on the surface of the aluminum-plastic film material, and the high-temperature weather resistance, the water resistance and the flame retardant property of the black aluminum-plastic film are still poor.
Disclosure of Invention
Based on the defects in the prior art, the invention provides an outer-layer film material for an aluminum-plastic film and a matte black flame-retardant aluminum-plastic film for an automobile battery.
In order to achieve the purpose, the invention adopts the following technical scheme:
the outer-layer film material for the aluminum plastic film comprises a double-layer co-extrusion PET layer, wherein the double-layer co-extrusion PET layer comprises a stacked nano carbon black modified PET film layer and a nano silicon dioxide modified PET film layer.
As a preferred scheme, the double-layer co-extrusion PET layer is obtained by co-extrusion of a T-shaped die head of a double-screw extruder, and comprises the following steps:
s1, respectively preparing a nano-silica modified PET master batch and a nano-carbon black modified PET master batch;
s2, respectively adding the PET master batch modified by the nano silicon dioxide and the PET master batch modified by the nano carbon black into a multi-port double-screw extruder containing a T-shaped die head from two notches, adding a processing aid, melting, filtering to obtain two PET melts, forming an upper and lower stacked structure through a cavity of a double screw, and after flowing out of the T-shaped die head, rapidly cooling a cast sheet to obtain a PET thick sheet;
and S3, stretching the PET thick sheet transversely and longitudinally, and cooling after slitting to obtain the double-layer co-extruded PET layer.
Preferably, in step S1, the preparing of the nano-silica modified PET masterbatch includes:
melting, mixing and filtering PET particles, nano-silica particles and an auxiliary agent by a double-screw extruder, extruding casting sheets, rapidly cooling and dicing to obtain nano-silica modified PET master batches; wherein the adding amount of the silicon dioxide is controlled to be 3-7% of the total material amount.
Preferably, the process parameters of the double-screw extruder comprise: the temperature of the conveying section is controlled to be 250 ℃, the temperature of the melting section is controlled to be 270 ℃, the temperature of the homogenizing section is controlled to be 280 ℃, the temperature of the filter screen is 280 ℃, and the temperature of the melt line is controlled to be 270 ℃.
Preferably, in step S1, the preparing of the PET masterbatch modified by nano carbon black includes:
melting, blending and filtering the PET particles, the nano carbon black particles and the auxiliary agent by a double-screw extruder, extruding casting sheets, and rapidly cooling and dicing to obtain nano carbon black modified PET master batches; wherein the adding amount of the carbon black is controlled to be 0.5-4.5% of the total material amount.
Preferably, the process parameters of the double-screw extruder comprise: the temperature of the conveying section is controlled to be 260 ℃, the temperature of the melting section is controlled to be 280 ℃, the temperature of the homogenizing section is controlled to be 290 ℃, the temperature of the filter screen is 270 ℃, and the temperature of the melt line is controlled to be 280 ℃.
Preferably, the thickness of the nano carbon black modified PET film layer is 20 μm, and the thickness of the nano silicon dioxide modified PET film layer is 5 μm.
The invention also provides a black flame-retardant aluminum-plastic film which sequentially comprises a CPP layer, an inner adhesive layer, an aluminum foil layer, an outer adhesive layer and the outer layer film material in any scheme from inside to outside, wherein the nano silicon dioxide modified PET film layer is positioned outside the nano carbon black modified PET film layer.
Preferably, the inner surface and the outer surface of the aluminum foil layer are respectively provided with a trivalent chromium treatment layer.
The invention also provides a power automobile battery, which adopts the black flame-retardant aluminum-plastic film of any scheme.
Compared with the prior art, the invention has the beneficial effects that:
the outer-layer film material for the aluminum-plastic film is prepared from two layers of modified PET through a double-screw extruder, has excellent character prominence, hydrolysis resistance, thermal stability, high-temperature weather resistance and flame retardant property, and is particularly suitable for the aluminum-plastic film for the lithium ion battery in a new energy automobile.
The black flame-retardant aluminum-plastic film disclosed by the invention has excellent text prominence, hydrolysis resistance, thermal stability, high-temperature weather resistance and flame retardance, and is particularly suitable for lithium ion batteries in new energy automobiles.
The power automobile battery provided by the invention is high in safety and long in service life.
Drawings
FIG. 1 is a schematic cross-sectional view showing an outer film for an aluminum plastic film according to example 1 of the present invention;
fig. 2 is a schematic cross-sectional structure view of a black flame-retardant aluminum-plastic film of example 1 of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, the following description will explain the embodiments of the present invention with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
Example 1:
as shown in fig. 1, the outer layer film material for the aluminum plastic film of the embodiment includes a double-layer co-extruded PET layer, and the double-layer co-extruded PET layer includes a stacked nano carbon black modified PET film layer 1 and a nano silica modified PET film layer 2.
When the outer layer film material for the aluminum-plastic film of the embodiment is used for manufacturing the aluminum-plastic film, the nano carbon black modified PET film layer 1 is used as an inner layer, and the nano silica modified PET film layer 2 is used as an outer layer.
The double-layer co-extrusion PET layer is obtained by co-extruding a T-shaped die head of a double-screw extruder, and specifically comprises the following steps:
s1, preparing the PET master batch modified by the nano silicon dioxide and the PET master batch modified by the nano carbon black respectively.
Specifically, the preparation of the PET master batch modified by the nano silicon dioxide comprises the following steps:
adding a certain proportion of high-temperature dried pure PET particles, nano-silica particles, an antioxidant, an opening agent, a slipping agent, an ultraviolet stabilizer, an antistatic agent and other auxiliaries into a double-screw extruder, controlling the addition of silica to be 3-7% of the total material amount, controlling the temperature of a conveying section of the double-screw extruder to be 250 ℃, the temperature of a melting section to be 270 ℃, the temperature of a homogenizing section to be 280 ℃, the temperature of a filter screen to be 280 ℃, the temperature of a melt line to be 270 ℃, melting, mixing and filtering PET by the double-screw extruder, and rapidly cooling and dicing after extruding and casting sheets to obtain the nano-silica modified PET master batch.
Specifically, the preparation of the nano carbon black modified PET master batch comprises the following steps:
melting, blending, filtering and extruding a certain proportion of PET ions dried at high temperature, nano carbon black particles, an antioxidant, an opening agent, a slipping agent, an ultraviolet stabilizer, an antistatic agent and other auxiliaries by a double-screw extruder to obtain nano carbon black modified PET master batch, and controlling the addition of the carbon black to be 0.5-4.5% of the total material amount. Wherein the temperature of the conveying section of the double-screw extruder is controlled to be 260 ℃, the temperature of the melting section is controlled to be 280 ℃, the temperature of the homogenizing section is controlled to be 290 ℃, the temperature of the filter screen is 270 ℃, the temperature of the melt line is controlled to be 280 ℃, and PET is melted, mixed and filtered by the double-screw extruder, and rapidly cooled and granulated after extrusion to obtain the nano carbon black modified PET master batch.
S2, respectively adding the prepared nano-silica modified PET master batch and nano-carbon black modified PET master batch into a multi-port double-screw extruder containing a T-shaped die head from two notches, simultaneously adding processing aids such as an antioxidant, a shedding agent, a slipping agent, an ultraviolet stabilizer, an antistatic agent and the like, melting and filtering to obtain two PET melts, forming an upper and lower stacked structure through a cavity of a double screw, and after flowing out of the T-shaped die head, rapidly cooling a cast sheet to obtain a PET thick sheet;
and S3, stretching the PET thick sheet transversely and longitudinally, cutting and cooling to obtain a double-layer co-extruded PET layer, and thus obtaining the outer-layer film material for the aluminum plastic film.
The thickness of the outer layer film material for the aluminum plastic film is preferably 25 μm, the thickness of the outer nano-silica modified PET film layer is preferably 5 μm, and the thickness of the inner nano-carbon black modified PET film layer is preferably 20 μm. The above preferred dimensions are merely illustrative and are not limited to the above dimensions.
The outer layer of the outer layer film material of the embodiment is the nano-silica modified PET, mainly aiming at improving the flame retardant property and the thermal stability of the PET and improving the light reflectivity of the material; the inner layer is nano carbon black modified PET, which mainly improves the flame retardance and high-temperature weather resistance of the material and improves the color of the material. So that the finally obtained aluminum-plastic film has excellent high-temperature weather resistance, thermal stability, flame retardance and character prominence.
The black flame-retardant aluminum-plastic film provided by the embodiment is an eight-layer composite film structure layer, and the outer-layer film material for the aluminum-plastic film provided by the embodiment is adopted.
Specifically, as shown in fig. 2, the structure of the black flame retardant aluminum plastic film of the present embodiment is, in order from the outermost layer to the innermost layer:
the nano-silica modified PET film layer 2, the nano-carbon black modified PET film layer 1, the outer adhesive layer 3, the trivalent chromium treatment layer 4, the aluminum foil layer 5, the trivalent chromium treatment layer 6, the inner adhesive layer 7 and the cast polypropylene layer 8.
The outer rubber layer is a urethane resin layer, and the thickness thereof is preferably 4 μm, but is not limited to this size.
The thickness of the trivalent chromium treatment layer is 500-700nm, and the trivalent chromium treatment layer can effectively improve the humidity resistance and the electrolyte resistance of the aluminum plastic film.
The aluminum foil is 8021 series O-state aluminum foil, and the thickness is 40 μm, but is not limited to the size.
The inner rubber layer is a modified polyisobutylene modified inner rubber layer, the thickness of the inner rubber layer is 4 micrometers, and the inner rubber layer is not limited to the size.
The above cast polypropylene layer was obtained by melt-coextrusion of three polypropylene layers, and the thickness thereof was 80 μm, but not limited to this size.
The power automobile battery provided by the embodiment adopts the black flame-retardant aluminum-plastic film of the embodiment to realize the packaging of the battery core through the packaging process, so that the durability of the battery is improved, and the use safety of the battery is also improved.
Example 2:
the aluminum plastic film of the present example is different from example 1 in that:
the outer layer of the aluminum-plastic film is replaced by the single-layer nano carbon black modified PET layer of the first embodiment.
Specifically, the aluminum plastic film of the embodiment has a structure that the nano carbon black modified PET layer is sequentially arranged from outside to inside, and the thickness is 25 μm; the thickness of the polyurethane outer adhesive layer is 4 mu m; a trivalent chromium treatment layer with the thickness of 500-700 nm; an aluminum foil layer with the thickness of 40 mu m; a trivalent chromium treatment layer with the thickness of 500-700 nm; the modified polyisobutylene inner rubber layer is 4 mu m thick; cast polypropylene layer, thickness 80 microns.
Other structures can refer to embodiment 1.
Example 3:
the aluminum plastic film of the present example is different from example 1 in that:
the outer layer of the aluminum-plastic film is replaced by nano carbon black and nano silicon dioxide, and a modified PET layer is added at the same time.
Specifically, the aluminum-plastic film of the embodiment has a structure that a modified PET layer is added to the nano carbon black and the nano silica in sequence from outside to inside, and the thickness is 25 μm; the thickness of the polyurethane outer adhesive layer is 4 mu m; a trivalent chromium treatment layer with the thickness of 500-700 nm; an aluminum foil layer with the thickness of 40 mu m; a trivalent chromium treatment layer with the thickness of 500-700 nm; the modified polyisobutylene inner rubber layer is 4 mu m thick; cast polypropylene layer, thickness 80 μm.
Other structures can refer to embodiment 1.
Example 4:
the aluminum plastic film of the present example is different from example 1 in that:
the thickness of the nano carbon black modified PET film layer and the thickness of the nano silicon dioxide modified PET film layer in the double-layer co-extrusion PET layer are different.
Specifically, the aluminum plastic film of the embodiment has a structure that the nano-silica modified PET layer is sequentially formed from outside to inside, and the thickness of the nano-silica modified PET layer is 10 μm; a nano carbon black modified PET layer with the thickness of 15 mu m; the thickness of the polyurethane outer adhesive layer is 4 mu m; a trivalent chromium treatment layer with the thickness of 500-700 nm; an aluminum foil layer with the thickness of 40 mu m; a trivalent chromium treatment layer with the thickness of 500-700 nm; the modified polyisobutylene inner rubber layer is 4 mu m thick; cast polypropylene layer, thickness 80 μm.
Other structures can refer to embodiment 1.
The power vehicle battery of the embodiment is packaged by using the aluminum plastic film of the embodiment.
Comparative example 1:
the commercially available aluminum-plastic film for the black battery has a structure comprising a nylon layer, an outer adhesive layer (black), an aluminum foil layer, a chromium treatment layer, an inner adhesive layer and a CPP layer from outside to inside. The specific model of the aluminum plastic film for black batteries is EL35H (3) BM of DNP.
Comparative example 2:
the commercially available aluminum plastic film for the black lithium ion battery is structurally composed of a nylon layer (black), an outer adhesive layer, an aluminum foil layer, an inner adhesive layer and a CPP layer from outside to inside. Wherein the specific model of the aluminum plastic film for the black lithium ion battery is
The aluminum-plastic films of the above examples and comparative examples were tested and compared, specifically as follows:
first, deep punching performance test
Forming a mold: 120mm by 100 mm;
angle R of the die: 2.5 degrees;
depth punching speed: 5 mm/sec;
the test results are shown in table 1.
TABLE 1 penetration test of aluminum plastic films of examples and comparative examples
Sample (I) Example 1 Example 2 Example 3 Example 4 Comparative example 1 Comparative example 2
Ultimate depth of penetration/mm 7.0 6.8 6.0 6.5 7.1 6.8
The results show that:
(1) when the thickness of the nano-silica modified PET is controlled to be 5mm and the thickness of the nano-carbon black modified PET is controlled to be 20mm, the depth of the double-layer PET as the outer layer of the aluminum-plastic film material is the best.
(2) The drawing depth performance of the black aluminum-plastic film prepared by the double-layer PET is slightly inferior to that of the commercial aluminum-plastic film with black outer layer glue, but is superior to that of the aluminum-plastic film prepared by the black nylon.
(3) Compared with the layered modification of the nano carbon black, the blending modification of the nano silicon dioxide is more beneficial to the deep punching performance of the aluminum-plastic film material.
Second, moisture and heat resistance test
The aluminum-plastic films of the above examples and comparative examples were each subjected to deep drawing to prepare an aluminum-plastic film having a double-pit depth of 6.0mm, which was folded in half and subjected to top sealing and side sealing to obtain a molded lithium ion battery cell case, which was placed in a mixed solution of ethylene glycol and water, respectively, and the whole solution was placed in an environment of 80 ℃ for a period of time to observe whether the surface of the cell was corroded. The specific results are shown in table 2, which shows that the aluminum-plastic film material prepared from the nano carbon black and the nano silica modified double-layer PET has excellent high-temperature damp-heat resistance.
Table 2: damp and heat resistance test of the aluminum plastic films of each example and comparative example
Figure BDA0002510756780000091
Three, horizontal and vertical burning test
The outer layer films of the above examples and comparative examples were subjected to horizontal and vertical burning tests to characterize their flame retardant properties. The results are shown in table 3 below, which shows that the flame retardant property of PET can be significantly improved by nano carbon black and nano silica.
TABLE 3 Combustion rating of the aluminum plastic film of each example and comparative example
Sample (I) Example 1 Example 2 Example 3 Example 4 Comparative example 1 Comparative example 2 Pure PET
Grade of combustion VTM-1 VTM-1 VTM-1 VTM-1 VTM-2 VTM-1 VTM-2
Four, Lab value test
The outer layer films of the above examples and comparative examples were subjected to code-jet printing and Lab value testing. The specific results are shown in table 4, when the value of L is controlled to be 24-29, the inkjet printing effect of the material is good, and the character prominence is good.
TABLE 4 Lab values for code-jet printing of the outer layer films of each example and comparative example
Sample (I) Example 1 Example 2 Example 3 Example 4 Comparative example 1 Comparative example 2
L* 25.16 37.81 35.33 19.21 24.55 29.53
a* -0.61 0.77 0.56 -0.33 -0.58 -0.88
b* -0.92 0.42 0.40 -0.98 -0.81 -0.97
c* 1.1 0.88 0.57 0.88 1.00 1.05
Example 5:
the aluminum plastic film of the present example is different from example 1 in that:
trivalent chromium treatment layers on the inner surface and the outer surface of the aluminum foil layer can be omitted, the structure of the aluminum-plastic film is simplified, the cost is reduced, and the requirements of different application occasions are met.
Other structures can refer to embodiment 1.
The power vehicle battery of the embodiment is packaged by using the aluminum plastic film of the embodiment.
In conclusion, the outer-layer film material for the aluminum-plastic film can obviously improve the temperature resistance, weather resistance, water resistance, character highlighting performance and flame retardant property of the aluminum-plastic film material, ensures the safe and long-term use of the lithium battery, and is particularly suitable for the lithium ion battery for the new energy automobile.
The foregoing has outlined rather broadly the preferred embodiments and principles of the present invention and it will be appreciated that those skilled in the art may devise variations of the present invention that are within the spirit and scope of the appended claims.

Claims (10)

1. The outer-layer film material for the aluminum plastic film is characterized by comprising a double-layer co-extrusion PET layer, wherein the double-layer co-extrusion PET layer comprises a stacked nano carbon black modified PET film layer and a nano silicon dioxide modified PET film layer.
2. The outer film material for the aluminum-plastic film as claimed in claim 1, wherein the double-layer co-extruded PET layer is obtained by co-extrusion through a T-die of a twin-screw extruder, and comprises the following steps:
s1, respectively preparing a nano-silica modified PET master batch and a nano-carbon black modified PET master batch;
s2, respectively adding the PET master batch modified by the nano silicon dioxide and the PET master batch modified by the nano carbon black into a multi-port double-screw extruder containing a T-shaped die head from two notches, adding a processing aid, melting, filtering to obtain two PET melts, forming an upper and lower stacked structure through a cavity of a double screw, and after flowing out of the T-shaped die head, rapidly cooling a cast sheet to obtain a PET thick sheet;
and S3, stretching the PET thick sheet transversely and longitudinally, and cooling after slitting to obtain the double-layer co-extruded PET layer.
3. The outer film material of claim 2, wherein the preparation of the nano-silica modified PET masterbatch in step S1 comprises:
melting, mixing and filtering PET particles, nano-silica particles and an auxiliary agent by a double-screw extruder, extruding casting sheets, rapidly cooling and dicing to obtain nano-silica modified PET master batches; wherein the adding amount of the silicon dioxide is controlled to be 3-7% of the total material amount.
4. The outer film material for the aluminum-plastic film as claimed in claim 3, wherein the process parameters of the twin-screw extruder comprise: the temperature of the conveying section is controlled to be 250 ℃, the temperature of the melting section is controlled to be 270 ℃, the temperature of the homogenizing section is controlled to be 280 ℃, the temperature of the filter screen is 280 ℃, and the temperature of the melt line is controlled to be 270 ℃.
5. The outer film material of claim 2, wherein the preparation of the PET masterbatch modified with nano carbon black in step S1 comprises:
melting, blending and filtering the PET particles, the nano carbon black particles and the auxiliary agent by a double-screw extruder, extruding casting sheets, and rapidly cooling and dicing to obtain nano carbon black modified PET master batches; wherein the adding amount of the carbon black is controlled to be 0.5-4.5% of the total material amount.
6. The outer film material for the aluminum-plastic film as claimed in claim 5, wherein the process parameters of the twin-screw extruder comprise: the temperature of the conveying section is controlled to be 260 ℃, the temperature of the melting section is controlled to be 280 ℃, the temperature of the homogenizing section is controlled to be 290 ℃, the temperature of the filter screen is 270 ℃, and the temperature of the melt line is controlled to be 280 ℃.
7. The outer film material for the aluminum plastic film as recited in claim 1, wherein the thickness of the nano carbon black modified PET film layer is 20 μm, and the thickness of the nano silica modified PET film layer is 5 μm.
8. A black flame-retardant aluminum-plastic film is characterized by comprising a CPP layer, an inner adhesive layer, an aluminum foil layer, an outer adhesive layer and the outer film material as claimed in any one of claims 1 to 7 in sequence from inside to outside, wherein a nano-silica modified PET film layer is positioned outside the nano-carbon black modified PET film layer.
9. The black flame retardant aluminum-plastic film of claim 8, wherein said aluminum foil layer has trivalent chromium treated layer on the inner and outer surface.
10. A battery for a power vehicle, characterized in that the black flame-retardant aluminum-plastic film according to claim 8 or 9 is used.
CN202010460343.1A 2020-05-27 2020-05-27 Outer-layer film material for aluminum-plastic film, black flame-retardant aluminum-plastic film and application of black flame-retardant aluminum-plastic film Pending CN111761909A (en)

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CN112646234A (en) * 2020-11-23 2021-04-13 浙江南都电源动力股份有限公司 Aluminum plastic film additive with heat conduction and flame retardance as well as preparation method and application thereof

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CN109192887A (en) * 2018-07-17 2019-01-11 上海恩捷新材料科技股份有限公司 A kind of aluminum plastic film and preparation method thereof
CN109994566A (en) * 2017-12-28 2019-07-09 宁波长阳科技股份有限公司 Solar energy backboard membrane and preparation method thereof

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CN109994566A (en) * 2017-12-28 2019-07-09 宁波长阳科技股份有限公司 Solar energy backboard membrane and preparation method thereof
CN109192887A (en) * 2018-07-17 2019-01-11 上海恩捷新材料科技股份有限公司 A kind of aluminum plastic film and preparation method thereof

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