WO2019206153A1 - Novel aluminum plastic composite film and preparation method therefor - Google Patents

Novel aluminum plastic composite film and preparation method therefor Download PDF

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Publication number
WO2019206153A1
WO2019206153A1 PCT/CN2019/083962 CN2019083962W WO2019206153A1 WO 2019206153 A1 WO2019206153 A1 WO 2019206153A1 CN 2019083962 W CN2019083962 W CN 2019083962W WO 2019206153 A1 WO2019206153 A1 WO 2019206153A1
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layer
polypropylene resin
hot melt
melt adhesive
plastic composite
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PCT/CN2019/083962
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French (fr)
Chinese (zh)
Inventor
张建林
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苏州融达信新材料科技有限公司
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Publication of WO2019206153A1 publication Critical patent/WO2019206153A1/en

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/154—Coating solid articles, i.e. non-hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • 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
    • 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
    • B32B15/09—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
    • 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
    • B32B27/32—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
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • B29L2009/003—Layered products comprising a metal layer
    • 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
    • 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

Definitions

  • the invention relates to a flexible packaging technology for a lithium ion battery, and more particularly relates to a novel aluminum plastic composite film and a preparation method thereof.
  • the aluminum-plastic composite film used for the lithium ion battery packaging technology has a good punching performance and short-circuit proof performance in order to achieve better performance, and is generally made into a patented patent application number CN201310453759.0 patent structure, specifically, The structure of the aluminum-plastic composite film is: outer layer protective layer, second adhesive layer, chemical treatment layer I, aluminum foil layer, chemical treatment layer II, hot melt adhesive layer, and finally inner heat seal layer.
  • the outer protective layer is bonded to the chemical treatment layer I by an adhesive layer.
  • the process is complicated and the time-consuming period is relatively long. Specifically, the surface of the chemical treatment layer I needs to be coated with liquid glue, and then The outer protective layer is covered on the liquid glue water and then cured for 6 days in an environment of 60 ° C;
  • liquid glue Due to the use of liquid glue, the existing liquid glue contains organic solvents, so it will release a large amount of VOC and pollute the environment during use and curing.
  • the present invention provides a novel aluminum-plastic composite film and a preparation method thereof.
  • the novel aluminum-plastic composite film of the invention treats the barrier layer of the inner heat sealing layer in multiple layers, so that the defects of "fisheye” or "crystal point” on each layer can be staggered, thereby making hydrofluoric acid Or the electrolyte cannot penetrate the barrier layer in the heat seal layer, thereby eliminating the need for chemical treatment of any surface of the aluminum foil, eliminating the chemical treatment layer I and the chemical treatment layer II; and the novel aluminum-plastic composite film of the invention is no longer
  • the adhesive layer is directly replaced by hot melt adhesive, which shortens the production cycle and reduces environmental pollution.
  • the present invention provides a method for producing the above novel aluminum-plastic composite film.
  • a novel aluminum-plastic composite film characterized in that it comprises an outer protective layer, a hot melt adhesive layer I, a middle aluminum foil layer, a hot melt adhesive layer II and an internal heat seal layer which are sequentially stacked, wherein the inner heat seal layer is two A coextruded layer of polypropylene resin of different melting points, and a side of the lithium ion battery is a single layer of a polypropylene resin film structure, and a side away from the lithium ion battery is a multilayer polypropylene film structure.
  • the outer protective layer is a nylon layer, or a polyethylene terephthalate layer, or a multilayer structure in which a polyethylene terephthalate layer and a nylon layer are combined by a hot melt adhesive layer.
  • the thickness of the nylon layer is 15 to 30 um. If the outer protective layer is polyethylene terephthalate, the thickness of the polyethylene terephthalate is 15 to 30 um. If the outer protective layer is a multilayer structure in which the polyethylene terephthalate layer and the nylon layer are combined by hot melt adhesive, the thickness of the ethylene terephthalate layer is 10 to 30 ⁇ m, and the thickness of the nylon layer is 10 ⁇ 30um, hot melt adhesive layer 3 ⁇ 15um, more preferably hot melt adhesive layer is 3 ⁇ 15um.
  • the hot melt adhesive layer I and the hot melt adhesive layer II are hot melt adhesives mainly composed of maleic anhydride modified polypropylene resin.
  • the thickness of the hot melt adhesive layer I and the hot melt adhesive layer II are respectively 3 um to 15 um, and more preferably, the thickness of the hot melt adhesive layer I and the hot melt adhesive layer II are 3 um to 5 um, respectively.
  • the aluminum foil layer has a thickness of 10 to 60 um.
  • two different melting point polypropylene resins in the internal heat seal layer include a copolymerized polypropylene resin and a homopolypropylene resin.
  • the thickness of the single-layer polypropylene resin film on the side close to the lithium ion battery is 5 to 30 ⁇ m; the number of layers of the multilayer polypropylene resin film on the side far from the lithium ion battery is 2 to 12 layers, and The thickness of each layer is 10 um to 30 um, and the total thickness of the multilayer polypropylene film on the side away from the lithium ion battery is 20 um to 80 um.
  • the present invention has a structure of a polypropylene resin film which is multi-layered away from the side of the lithium ion battery in the heat sealing layer, and the structure makes a certain amount of surface even if each layer of the polypropylene resin film has defects.
  • the electrolyte or hydrofluoric acid penetrates the first layer, it must penetrate through the second layer, using a multi-layered polypropylene resin film, that is, hydrofluoric acid or electrolyte penetrates the surface of the aluminum foil.
  • the probability is greatly reduced. Therefore, by adopting the structure of the novel aluminum-plastic composite film of the present invention, the chemical treatment of the surface of the aluminum foil can be omitted.
  • the novel aluminum-plastic composite film of the invention no longer uses liquid glue to connect the aluminum foil layer and the protective layer, but directly bonds the aluminum foil layer and the protective layer by using hot melt adhesive, so that the production cycle is shortened and the cost is reduced, and the The yield rate.
  • the invention provides a preparation method of the above aluminum-plastic composite film, and mainly has two preparation methods: the following steps are included:
  • Preparation method 1 three-layer co-extrusion method is used to produce hot melt adhesive layer II and internal heat seal layer, wherein the intermediate layer in the co-extrusion machine contains a distributor, and finally the result of extrusion is that the intermediate layer is a multilayer polypropylene resin.
  • the film is made of a maleic anhydride-modified polypropylene resin film and a single-layer polypropylene resin film on both sides; then, the maleic anhydride-modified polypropylene resin film side of the extruded product in the previous step is directly bonded to the aluminum foil. After the temperature is lowered, the other side of the aluminum foil is extruded at a high temperature to the maleic anhydride-modified polypropylene resin, and the protective layer is simultaneously bonded.
  • Preparation method 2 The inner heat sealing layer is produced by double-layer co-extrusion, wherein one layer in the extrusion machine contains a distributor, and finally the result of extrusion is a single layer of polypropylene resin film on one side and multiple layers on the other side. a polypropylene resin film; then, after extruding the extrudate in the previous step, the high-temperature base calcium maleate-modified polypropylene resin is laminated on the surface of the multilayer polypropylene resin film, and the aluminum foil is laminated, and after cooling Then, the other side of the aluminum foil is extruded at a high temperature to the maleic anhydride-modified polypropylene resin, and the protective layer is simultaneously bonded.
  • FIG. 1 is a schematic view showing the structure of an aluminum-plastic composite film of Embodiment 1.
  • FIG. 2 is a schematic view showing the structure of an aluminum-plastic composite film of Embodiment 2.
  • FIG. 3 is a schematic view showing the structure of an aluminum-plastic composite film of Embodiment 3.
  • External protection layer 1 Nylon layer 11 Hot melt adhesive layer 12 Polyphthalic acid layer 13 Hot melt adhesive layer I 2 Middle aluminum foil layer 3 Hot melt adhesive layer II 4 Internal heat seal 5
  • Multilayer polypropylene resin film structure 51 Single layer polypropylene resin film structure 52
  • FIG. 1 it is a schematic structural view of an aluminum-plastic composite film according to Embodiment 1, characterized in that it comprises an outer protective layer (1), a hot melt adhesive layer I (2), and a middle aluminum foil layer (3) which are sequentially stacked. ), hot melt adhesive layer II (4) and internal heat seal layer (5), wherein the inner heat seal layer (5) is a coextruded layer of two different melting point polypropylene resins, and the side close to the lithium ion battery is The single-layer polypropylene resin film structure (52), the side away from the lithium ion battery is a multilayer polypropylene resin film structure (51).
  • the outer protective layer (1) is a nylon layer (11) having a thickness of 25 um.
  • Hot melt adhesive layer I (2) and hot melt adhesive layer II (4) are hot melt adhesives mainly composed of maleic anhydride modified polypropylene resin, hot melt adhesive layer I (2) and hot melt adhesive layer II (4) The thickness of each is 4um.
  • the aluminum foil layer has a thickness of 25 um.
  • the two different melting point polypropylene resins in the inner heat sealing layer (5) are homopolypropylene resins, and the thickness of the single layer polypropylene resin film (52) on the side close to the lithium ion battery is 6 um.
  • the multilayer polypropylene film (51) on the side away from the lithium ion battery has 2 layers, and each layer has a thickness of 20 ⁇ m.
  • the aluminum-plastic composite film in the specific embodiment 1 is prepared by three-layer co-extrusion to produce a hot melt adhesive layer II (4) and an inner heat seal layer (5), wherein the intermediate layer in the co-extrusion machine contains
  • the intermediate layer is a two-layer polypropylene resin film (51), which are respectively a maleic anhydride-modified polypropylene resin film (4) and a single-layer polypropylene resin film (52);
  • the maleic anhydride-modified polypropylene resin film side (4) of the extruded product (4+51+52) in the previous step is directly bonded to the aluminum foil (3), and after cooling, the aluminum foil (3) is further applied.
  • the maleic anhydride-modified polypropylene resin (2) is extruded at a high temperature, and at the same time, the protective layer (11) is attached.
  • Embodiment 2 is a schematic structural view of an aluminum-plastic composite film according to Embodiment 2, which is characterized in that it comprises an outer protective layer (1), a hot melt adhesive layer I(2), and a middle aluminum foil layer (3) which are sequentially stacked. ), hot melt adhesive layer II (4) and internal heat seal layer (5), wherein the inner heat seal layer (5) is a coextruded layer of two different melting point polypropylene resins, and the side close to the lithium ion battery is The single-layer polypropylene resin film structure (52), the side away from the lithium ion battery is a multilayer polypropylene resin film structure (51).
  • the outer protective layer (1) is a polyethylene terephthalate (13), a hot melt adhesive (12) and a nylon layer (11) which are sequentially stacked, wherein polyethylene terephthalate (13)
  • the thickness of the laminate is 19 um
  • the thickness of the hot melt adhesive (12) is 3.2 um
  • the thickness of the nylon layer (11) is 16 um.
  • Hot melt adhesive (12), hot melt adhesive layer I (2) and hot melt adhesive layer II (4) are hot melt adhesives mainly composed of maleic anhydride modified polypropylene resin, hot melt adhesive layer I (2) and The thickness of the hot melt adhesive layer II (4) is 4 um, respectively.
  • the aluminum foil layer has a thickness of 23 um.
  • the two different melting point polypropylene resins in the inner heat sealing layer (5) are copolymerized polypropylene resin, and the thickness of the single layer polypropylene resin film (52) near one side of the lithium ion battery is 10 um;
  • the multilayer polypropylene resin film (51) on the side far from the lithium ion battery has 3 layers, and each layer has a thickness of 12 ⁇ m.
  • the aluminum-plastic composite film in the specific embodiment 2 is prepared by three-layer co-extrusion to produce a hot melt adhesive layer II (4) and an inner heat seal layer (5), wherein the intermediate layer in the co-extrusion machine contains
  • the intermediate layer is a three-layer polypropylene resin film (51)
  • the two sides are a maleic anhydride-modified polypropylene resin film (4) and a single-layer polypropylene resin film (52);
  • the maleic anhydride-modified polypropylene resin film side (4) of the extruded product (4+51+52) in the previous step is directly bonded to the aluminum foil (3), and after cooling, the aluminum foil (3) is further applied.
  • the maleic anhydride-modified polypropylene resin (2) is extruded at a high temperature, and at the same time, the protective layer (11) is attached.
  • the protective layer (11) needs to be pretreated, that is, the hot melt adhesive (12) is extruded on one side of the polyethylene terephthalate (13), and then the nylon layer (11) is attached.
  • FIG. 3 it is a schematic structural view of an aluminum-plastic composite film according to Embodiment 3, which is characterized in that it comprises an outer protective layer (1), a hot melt adhesive layer I(2), and a middle aluminum foil layer (3) which are sequentially stacked. ), hot melt adhesive layer II (4) and internal heat seal layer (5), wherein the inner heat seal layer (5) is a coextruded layer of two different melting point polypropylene resins, and the side close to the lithium ion battery is The single-layer polypropylene resin film structure (52), the side away from the lithium ion battery is a multilayer polypropylene resin film structure (51).
  • the outer protective layer (1) is a nylon layer (11) having a thickness of 28 um.
  • Hot melt adhesive layer I (2) and hot melt adhesive layer II (4) are hot melt adhesives mainly composed of maleic anhydride modified polypropylene resin, hot melt adhesive layer I (2) and hot melt adhesive layer II (4) The thickness of each is 4.9 um.
  • the aluminum foil layer has a thickness of 28 um.
  • the two different melting point polypropylene resins in the inner heat seal layer (5) are homopolypropylene resins, and the thickness of the single layer polypropylene resin film (52) on the side close to the lithium ion battery is 16 ⁇ m.
  • the multilayer polypropylene film (51) on the side away from the lithium ion battery has 8 layers, and each layer has a thickness of 11 um.
  • the aluminum-plastic composite film in the specific embodiment 1 is prepared by three-layer co-extrusion to produce a hot melt adhesive layer II (4) and an inner heat seal layer (5), wherein the intermediate layer in the co-extrusion machine contains
  • the result of the final extrusion is that the intermediate layer is an eight-layer polypropylene resin film (51), and the two sides are a maleic anhydride-modified polypropylene resin film (4) and a single-layer polypropylene resin film (52);
  • the maleic anhydride-modified polypropylene resin film side (4) of the extruded product (4+51+52) in the previous step is directly bonded to the aluminum foil (3), and after cooling, the aluminum foil (3) is further applied.
  • the maleic anhydride-modified polypropylene resin (2) is extruded at a high temperature, and at the same time, the protective layer (11) is attached.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Laminated Bodies (AREA)

Abstract

An aluminum plastic composite film, comprising an outer protective layer (1), a hot melt adhesive layer I (2), a middle aluminum foil layer (3), a hot melt adhesive layer II (4), and an inner heat sealing layer (5) stacked in sequence, the inner heat sealing layer (5) being a coextruded layer of two polypropylene resins having different melting points. The barrier layer of the inner heat sealing layer of the aluminum plastic composite film is treated to have multiple layers, such that the "fish-eye" or "crystal point" defects on each layer are staggered, so that hydrofluoric acid or electrolyte cannot pass through the barrier layer in the heat sealing layer, and no chemical treatment to any surface of the aluminum foil is needed, omitting a chemical treatment layer; moreover, hot melt adhesive is used in the aluminum plastic composite film instead of an adhesive layer, shortening the production cycle, and reducing environmental pollution.

Description

一种新型铝塑复合膜及其制备方法Novel aluminum-plastic composite film and preparation method thereof 技术领域Technical field
本发明涉及锂离子电池的软包装技术，较为具体的，涉及到一种新型铝塑复合膜及其制备方法。The invention relates to a flexible packaging technology for a lithium ion battery, and more particularly relates to a novel aluminum plastic composite film and a preparation method thereof.
背景技术Background technique
目前，用于锂离子电池封装技术的铝塑复合膜，为了达到较好的性能，具有良好的冲深性能和防短路性能，通常做成专利申请号CN201310453759.0的专利的结构，具体的，铝塑复合膜的结构为：外层保护层、其次胶粘层、化学处理层I、铝箔层、化学处理层II、热熔胶层、最后内层热封层。At present, the aluminum-plastic composite film used for the lithium ion battery packaging technology has a good punching performance and short-circuit proof performance in order to achieve better performance, and is generally made into a patented patent application number CN201310453759.0 patent structure, specifically, The structure of the aluminum-plastic composite film is: outer layer protective layer, second adhesive layer, chemical treatment layer I, aluminum foil layer, chemical treatment layer II, hot melt adhesive layer, and finally inner heat seal layer.
然而，采用如上的这种结构存在以下缺陷：However, the use of such a structure as above has the following drawbacks:
1、在铝箔层表面进行化学处理形成化学处理层I和化学处理层II，相对来说工艺比较复杂，而且有可能存在重金属污染；但是如果不对铝箔层进行处理，尤其是如果不存在化学处理层II，则很有可能发生氢氟酸或者电解液从热封层穿透从而腐蚀铝箔，最终产生短路现象。1. Chemical treatment on the surface of the aluminum foil layer to form the chemical treatment layer I and the chemical treatment layer II, the process is relatively complicated, and there may be heavy metal contamination; however, if the aluminum foil layer is not treated, especially if there is no chemical treatment layer II, it is very likely that hydrofluoric acid or electrolyte penetrates from the heat seal layer to corrode the aluminum foil, eventually causing a short circuit.
2、用粘胶层将外层保护层与化学处理层I粘合起来，工艺较为复杂，且耗时周期相对较长，具体的需要在化学处理层I的表面，涂布液态胶水，然后将外层保护层覆盖在液态胶水上，然后在60℃的环境下老固化6天；2. The outer protective layer is bonded to the chemical treatment layer I by an adhesive layer. The process is complicated and the time-consuming period is relatively long. Specifically, the surface of the chemical treatment layer I needs to be coated with liquid glue, and then The outer protective layer is covered on the liquid glue water and then cured for 6 days in an environment of 60 ° C;
3、由于采用了液态胶水，现有的液态胶水中都含有有机溶剂，故其在使用并老固化的过程中，会释放出大量的VOC，污染环境。3. Due to the use of liquid glue, the existing liquid glue contains organic solvents, so it will release a large amount of VOC and pollute the environment during use and curing.
发明内容Summary of the invention
为了解决以上问题，本发明提出一种新型的铝塑复合膜及其制备方法。本发明的新型的铝塑复合膜，对内层热封层的阻隔层做多层的处理，使得每一层上的“鱼眼”或“晶点”的缺陷能够错开，从而使得氢氟酸或电解液无法穿透热封层中的阻隔层，从而无需对铝箔的任何表面进行化学处理，省去了化学处理层I和化学处理层II；同时本发明的新型的铝塑复合膜不再采用粘胶层，直接用热熔胶代替，缩短了生产周期，减少了环境污染。另外，本发明提供以上新型的铝塑复合膜的制备方法。In order to solve the above problems, the present invention provides a novel aluminum-plastic composite film and a preparation method thereof. The novel aluminum-plastic composite film of the invention treats the barrier layer of the inner heat sealing layer in multiple layers, so that the defects of "fisheye" or "crystal point" on each layer can be staggered, thereby making hydrofluoric acid Or the electrolyte cannot penetrate the barrier layer in the heat seal layer, thereby eliminating the need for chemical treatment of any surface of the aluminum foil, eliminating the chemical treatment layer I and the chemical treatment layer II; and the novel aluminum-plastic composite film of the invention is no longer The adhesive layer is directly replaced by hot melt adhesive, which shortens the production cycle and reduces environmental pollution. Further, the present invention provides a method for producing the above novel aluminum-plastic composite film.
一种新型的铝塑复合膜，其特征在于：其包括依次堆叠的外部保护层、热熔胶层I、中部铝箔层、热熔胶层II以及内部热封层，其中内部热封层为两种不同熔点的聚丙烯树脂的共挤层，且靠近锂离子电池的一侧为单层的聚丙烯树脂薄膜结构，远离锂离子电池的一侧为多层的聚丙烯树脂薄膜结构。A novel aluminum-plastic composite film characterized in that it comprises an outer protective layer, a hot melt adhesive layer I, a middle aluminum foil layer, a hot melt adhesive layer II and an internal heat seal layer which are sequentially stacked, wherein the inner heat seal layer is two A coextruded layer of polypropylene resin of different melting points, and a side of the lithium ion battery is a single layer of a polypropylene resin film structure, and a side away from the lithium ion battery is a multilayer polypropylene film structure.
进一步的，所述的外部保护层为尼龙层，或聚对苯二甲酸乙二酯层，或者聚对苯二甲酸乙二酯层与尼龙层通过热熔胶层结合起来的多层结构。Further, the outer protective layer is a nylon layer, or a polyethylene terephthalate layer, or a multilayer structure in which a polyethylene terephthalate layer and a nylon layer are combined by a hot melt adhesive layer.
进一步的，若外部保护层为尼龙层时，尼龙层的厚度15～30um。若外部保护层为聚对苯二甲酸乙二酯时，聚对苯二甲酸乙二酯的厚度为15～30um。若外部保护层为聚对苯二甲酸乙二酯层与尼龙层通过热熔胶结合起来的多层结构时，对苯二甲酸乙二酯层的厚度为10～30um，尼龙层的厚度为10～30um，热熔胶层3～15um，较为优选的热熔胶层为3～15um。Further, if the outer protective layer is a nylon layer, the thickness of the nylon layer is 15 to 30 um. If the outer protective layer is polyethylene terephthalate, the thickness of the polyethylene terephthalate is 15 to 30 um. If the outer protective layer is a multilayer structure in which the polyethylene terephthalate layer and the nylon layer are combined by hot melt adhesive, the thickness of the ethylene terephthalate layer is 10 to 30 μm, and the thickness of the nylon layer is 10 ～30um, hot melt adhesive layer 3～15um, more preferably hot melt adhesive layer is 3～15um.
进一步的，所述的热熔胶层I和热熔胶层II为马来酸酐改性聚丙烯树酯为主体的热熔胶。Further, the hot melt adhesive layer I and the hot melt adhesive layer II are hot melt adhesives mainly composed of maleic anhydride modified polypropylene resin.
进一步的，所述的热熔胶层I和热熔胶层II的厚度分别为3um～15um，较为优选的，热熔胶层I和热熔胶层II的厚度分别为3um～5um。Further, the thickness of the hot melt adhesive layer I and the hot melt adhesive layer II are respectively 3 um to 15 um, and more preferably, the thickness of the hot melt adhesive layer I and the hot melt adhesive layer II are 3 um to 5 um, respectively.
进一步的，所述的铝箔层的厚10～60um。Further, the aluminum foil layer has a thickness of 10 to 60 um.
进一步的，所述的内部热封层中中的两种不同熔点的聚丙烯树脂，包括共聚聚丙烯树脂和均聚聚丙烯树脂。Further, two different melting point polypropylene resins in the internal heat seal layer include a copolymerized polypropylene resin and a homopolypropylene resin.
进一步的，靠近锂离子电池的一侧的单层的聚丙烯树脂薄膜的厚度为5～30um；远离锂离子电池的一侧的多层的聚丙烯树脂薄膜的层数为2～12层，且每一层的厚度为10um～30um，远离锂离子电池的一侧的多层的聚丙烯薄膜的总厚度为20um～80um。Further, the thickness of the single-layer polypropylene resin film on the side close to the lithium ion battery is 5 to 30 μm; the number of layers of the multilayer polypropylene resin film on the side far from the lithium ion battery is 2 to 12 layers, and The thickness of each layer is 10 um to 30 um, and the total thickness of the multilayer polypropylene film on the side away from the lithium ion battery is 20 um to 80 um.
本发明与现有技术相比，由于热封层中远离锂离子电池的一侧为多层的聚丙烯树脂薄膜结构，这种结构使得即使每一层聚丙烯树脂薄膜存在缺陷，表面存在一定数量的“鱼眼”或“晶点”，使得“鱼眼”或“晶点”处与周边无法形成均匀的整体，当电解液或氢氟酸渗透至第一层的聚丙烯树脂薄膜的“鱼眼”或“晶点”时，第二层的聚丙烯树脂薄膜上的“鱼眼”或“晶点”与第一层上的“鱼眼”或“晶点”重合的概率会成幂函数下降，故当电解液或氢氟酸穿透过第一层后，并一定会穿透过第二层，采用多层的聚丙烯树脂薄膜，就是的氢氟酸或电解液渗透到铝箔表面的概率大大下降。故采用本发明的新型的铝塑复合膜的结构，可以省去对铝箔表面的化学处理。并且本发 明的新型的铝塑复合膜不再采用液态胶水连接铝箔层与保护层，而是直接采用热熔胶对铝箔层和保护层进行粘接，使得生产周期缩短，节降了成本，提供了良品率。Compared with the prior art, the present invention has a structure of a polypropylene resin film which is multi-layered away from the side of the lithium ion battery in the heat sealing layer, and the structure makes a certain amount of surface even if each layer of the polypropylene resin film has defects. "fisheye" or "crystal point", so that "fisheye" or "crystal point" can not form a uniform whole with the periphery, when the electrolyte or hydrofluoric acid penetrates into the first layer of the polypropylene resin film "fish "eye" or "crystal point", the probability that the "fisheye" or "crystal point" on the second layer of polypropylene resin film coincides with the "fisheye" or "crystal point" on the first layer becomes a power function. Decreased, so when the electrolyte or hydrofluoric acid penetrates the first layer, it must penetrate through the second layer, using a multi-layered polypropylene resin film, that is, hydrofluoric acid or electrolyte penetrates the surface of the aluminum foil. The probability is greatly reduced. Therefore, by adopting the structure of the novel aluminum-plastic composite film of the present invention, the chemical treatment of the surface of the aluminum foil can be omitted. Moreover, the novel aluminum-plastic composite film of the invention no longer uses liquid glue to connect the aluminum foil layer and the protective layer, but directly bonds the aluminum foil layer and the protective layer by using hot melt adhesive, so that the production cycle is shortened and the cost is reduced, and the The yield rate.
本发明提供以上铝塑复合膜的制备方法，主要有两种制备方式：包括如下步骤：The invention provides a preparation method of the above aluminum-plastic composite film, and mainly has two preparation methods: the following steps are included:
制备方法一：采用三层共挤的方式生产热熔胶层II以及内部热封层，其中共挤机器中的中间层中含有分配器，最后挤出的结果为中间层为多层聚丙烯树脂薄膜，两边分别为马来酸酐改性的聚丙烯树脂薄膜和单层聚丙烯树脂薄膜；接着，将上一步中的挤出产品的马来酸酐改性的聚丙烯树脂薄膜侧与铝箔直接贴合，经过降温后，再将铝箔的另外一侧高温挤出马来酸酐改性的聚丙烯树脂，并同时贴合保护层。Preparation method 1: three-layer co-extrusion method is used to produce hot melt adhesive layer II and internal heat seal layer, wherein the intermediate layer in the co-extrusion machine contains a distributor, and finally the result of extrusion is that the intermediate layer is a multilayer polypropylene resin. The film is made of a maleic anhydride-modified polypropylene resin film and a single-layer polypropylene resin film on both sides; then, the maleic anhydride-modified polypropylene resin film side of the extruded product in the previous step is directly bonded to the aluminum foil. After the temperature is lowered, the other side of the aluminum foil is extruded at a high temperature to the maleic anhydride-modified polypropylene resin, and the protective layer is simultaneously bonded.
制备方法二：采用双层共挤的方式生产内部热封层，其中挤出机器中的一层中含有分配器，最后挤出的结果为一边为单层聚丙烯树脂薄膜，另外一边为多层聚丙烯树脂薄膜；接着，将上一步中的挤出物延压降温后，在多层聚丙烯树脂薄膜的表面高温基础马来酸钙改性的聚丙烯树脂，同时贴合铝箔，经过降温后，再将铝箔的另外一侧高温挤出马来酸酐改性的聚丙烯树脂，并同时贴合保护层。Preparation method 2: The inner heat sealing layer is produced by double-layer co-extrusion, wherein one layer in the extrusion machine contains a distributor, and finally the result of extrusion is a single layer of polypropylene resin film on one side and multiple layers on the other side. a polypropylene resin film; then, after extruding the extrudate in the previous step, the high-temperature base calcium maleate-modified polypropylene resin is laminated on the surface of the multilayer polypropylene resin film, and the aluminum foil is laminated, and after cooling Then, the other side of the aluminum foil is extruded at a high temperature to the maleic anhydride-modified polypropylene resin, and the protective layer is simultaneously bonded.
附图说明：BRIEF DESCRIPTION OF THE DRAWINGS:
下面结合附图对具体实施方式做进一步的说明，其中：The specific embodiments are further described below with reference to the accompanying drawings, wherein:
图1为具体实施方式1的铝塑复合膜的结构示意图。1 is a schematic view showing the structure of an aluminum-plastic composite film of Embodiment 1.
图2为具体实施方式2的铝塑复合膜的结构示意图。2 is a schematic view showing the structure of an aluminum-plastic composite film of Embodiment 2.
图3为具体实施方式3的铝塑复合膜的结构示意图。3 is a schematic view showing the structure of an aluminum-plastic composite film of Embodiment 3.
主要元器件说明：Main components description:
外部保护层External protection layer 11
尼龙层 Nylon layer 1111
热熔胶层Hot melt adhesive layer 1212
聚对苯二甲酸层Polyphthalic acid layer 1313
热熔胶层IHot melt adhesive layer I 22
中部铝箔层Middle aluminum foil layer 33
热熔胶层IIHot melt adhesive layer II 44
内部热封层 Internal heat seal 55
多层的聚丙烯树脂薄膜结构Multilayer polypropylene resin film structure 5151
单层的聚丙烯树脂薄膜结构Single layer polypropylene resin film structure 5252
如下具体实施方式将结合上述附图进一步说明本发明。The invention will be further illustrated by the following detailed description in conjunction with the accompanying drawings.
具体实施方式detailed description
具体实施案例1：Specific implementation case 1:
如图1所示，为具体实施方式1的铝塑复合膜的结构示意图，其特征在于：其包括依次堆叠的外部保护层(1)、热熔胶层I(2)、中部铝箔层(3)、热熔胶层II(4)以及内部热封层(5)，其中内部热封层(5)为两种不同熔点的聚丙烯树脂的共挤层，且靠近锂离子电池的一侧为单层的聚丙烯树脂薄膜结构(52)，远离锂离子电池的一侧为多层的聚丙烯树脂薄膜结构(51)。As shown in FIG. 1 , it is a schematic structural view of an aluminum-plastic composite film according to Embodiment 1, characterized in that it comprises an outer protective layer (1), a hot melt adhesive layer I (2), and a middle aluminum foil layer (3) which are sequentially stacked. ), hot melt adhesive layer II (4) and internal heat seal layer (5), wherein the inner heat seal layer (5) is a coextruded layer of two different melting point polypropylene resins, and the side close to the lithium ion battery is The single-layer polypropylene resin film structure (52), the side away from the lithium ion battery is a multilayer polypropylene resin film structure (51).
所述的外部保护层(1)为尼龙层(11)，厚度为25um。热熔胶层I(2)和热熔胶层II(4)为马来酸酐改性聚丙烯树酯为主体的热熔胶，热熔胶层I(2)和热熔胶层II(4)的厚度分别为4um。所述的铝箔层的厚度为25um。所述的内部热封层(5)中的两种不同熔点的聚丙烯树脂，为均聚聚丙烯树脂，靠近锂离子电池的一侧的单层的聚丙烯树脂薄膜(52)的厚度为6um；远离锂离子电池的一侧的多层的聚丙烯树脂薄膜(51)的层数为2层，且每一层的厚度为20um。The outer protective layer (1) is a nylon layer (11) having a thickness of 25 um. Hot melt adhesive layer I (2) and hot melt adhesive layer II (4) are hot melt adhesives mainly composed of maleic anhydride modified polypropylene resin, hot melt adhesive layer I (2) and hot melt adhesive layer II (4) The thickness of each is 4um. The aluminum foil layer has a thickness of 25 um. The two different melting point polypropylene resins in the inner heat sealing layer (5) are homopolypropylene resins, and the thickness of the single layer polypropylene resin film (52) on the side close to the lithium ion battery is 6 um. The multilayer polypropylene film (51) on the side away from the lithium ion battery has 2 layers, and each layer has a thickness of 20 μm.
具体实施案例1中的铝塑复合膜的制备方法为：采用三层共挤的方式生产热熔胶层II(4)以及内部热封层(5)，其中共挤机器中的中间层中含有分配器，最后挤出的结果为中间层为两层聚丙烯树脂薄膜(51)，两边分别为马来酸酐改性的聚丙烯树脂薄膜(4)和单层聚丙烯树脂薄膜(52)；接着，将上一步中的挤出产品(4+51+52)的马来酸酐改性的聚丙烯树脂薄膜侧(4)与铝箔(3)直接贴合，经过降温后，再将铝箔(3)的另外一侧高温挤出马来酸酐改性的聚丙烯树脂(2)，并同时贴合保护层(11)。The aluminum-plastic composite film in the specific embodiment 1 is prepared by three-layer co-extrusion to produce a hot melt adhesive layer II (4) and an inner heat seal layer (5), wherein the intermediate layer in the co-extrusion machine contains As a result of the final extrusion, the intermediate layer is a two-layer polypropylene resin film (51), which are respectively a maleic anhydride-modified polypropylene resin film (4) and a single-layer polypropylene resin film (52); The maleic anhydride-modified polypropylene resin film side (4) of the extruded product (4+51+52) in the previous step is directly bonded to the aluminum foil (3), and after cooling, the aluminum foil (3) is further applied. On the other side, the maleic anhydride-modified polypropylene resin (2) is extruded at a high temperature, and at the same time, the protective layer (11) is attached.
具体实施案例2：Specific implementation case 2:
如图2所示，为具体实施方式2的铝塑复合膜的结构示意图，其特征在于：其包括依次堆叠的外部保护层(1)、热熔胶层I(2)、中部铝箔层(3)、热熔胶层II(4)以及内部热封层(5)，其中内部热封层(5)为两种不同熔点的聚丙烯树脂的共挤层，且靠近锂离子电池的一侧为单层的聚丙烯树脂 薄膜结构(52)，远离锂离子电池的一侧为多层的聚丙烯树脂薄膜结构(51)。2 is a schematic structural view of an aluminum-plastic composite film according to Embodiment 2, which is characterized in that it comprises an outer protective layer (1), a hot melt adhesive layer I(2), and a middle aluminum foil layer (3) which are sequentially stacked. ), hot melt adhesive layer II (4) and internal heat seal layer (5), wherein the inner heat seal layer (5) is a coextruded layer of two different melting point polypropylene resins, and the side close to the lithium ion battery is The single-layer polypropylene resin film structure (52), the side away from the lithium ion battery is a multilayer polypropylene resin film structure (51).
所述的外部保护层(1)为依次堆叠的聚对苯二甲酸乙二酯(13)、热熔胶(12)和尼龙层(11)，其中，聚对苯二甲酸乙二酯(13)的厚度为19um，热熔胶(12)的厚度为3.2um，尼龙层(11)的厚度为16um。热熔胶(12)、热熔胶层I(2)和热熔胶层II(4)为马来酸酐改性聚丙烯树酯为主体的热熔胶，热熔胶层I(2)和热熔胶层II(4)的厚度分别为4um。所述的铝箔层的厚度为23um。所述的内部热封层(5)中的两种不同熔点的聚丙烯树脂，为共聚聚丙烯树脂，靠近锂离子电池的一侧的单层的聚丙烯树脂薄膜(52)的厚度为10um；远离锂离子电池的一侧的多层的聚丙烯树脂薄膜(51)的层数为3层，且每一层的厚度为12um。The outer protective layer (1) is a polyethylene terephthalate (13), a hot melt adhesive (12) and a nylon layer (11) which are sequentially stacked, wherein polyethylene terephthalate (13) The thickness of the laminate is 19 um, the thickness of the hot melt adhesive (12) is 3.2 um, and the thickness of the nylon layer (11) is 16 um. Hot melt adhesive (12), hot melt adhesive layer I (2) and hot melt adhesive layer II (4) are hot melt adhesives mainly composed of maleic anhydride modified polypropylene resin, hot melt adhesive layer I (2) and The thickness of the hot melt adhesive layer II (4) is 4 um, respectively. The aluminum foil layer has a thickness of 23 um. The two different melting point polypropylene resins in the inner heat sealing layer (5) are copolymerized polypropylene resin, and the thickness of the single layer polypropylene resin film (52) near one side of the lithium ion battery is 10 um; The multilayer polypropylene resin film (51) on the side far from the lithium ion battery has 3 layers, and each layer has a thickness of 12 μm.
具体实施案例2中的铝塑复合膜的制备方法为：采用三层共挤的方式生产热熔胶层II(4)以及内部热封层(5)，其中共挤机器中的中间层中含有分配器，最后挤出的结果为中间层为三层聚丙烯树脂薄膜(51)，两边分别为马来酸酐改性的聚丙烯树脂薄膜(4)和单层聚丙烯树脂薄膜(52)；接着，将上一步中的挤出产品(4+51+52)的马来酸酐改性的聚丙烯树脂薄膜侧(4)与铝箔(3)直接贴合，经过降温后，再将铝箔(3)的另外一侧高温挤出马来酸酐改性的聚丙烯树脂(2)，并同时贴合保护层(11)。其中保护层(11)需要经过预处理，也就是在聚对苯二甲酸乙二酯(13)的一面挤出热熔胶(12)，然后将尼龙层(11)贴合上去。The aluminum-plastic composite film in the specific embodiment 2 is prepared by three-layer co-extrusion to produce a hot melt adhesive layer II (4) and an inner heat seal layer (5), wherein the intermediate layer in the co-extrusion machine contains The result of the final extrusion is that the intermediate layer is a three-layer polypropylene resin film (51), and the two sides are a maleic anhydride-modified polypropylene resin film (4) and a single-layer polypropylene resin film (52); The maleic anhydride-modified polypropylene resin film side (4) of the extruded product (4+51+52) in the previous step is directly bonded to the aluminum foil (3), and after cooling, the aluminum foil (3) is further applied. On the other side, the maleic anhydride-modified polypropylene resin (2) is extruded at a high temperature, and at the same time, the protective layer (11) is attached. The protective layer (11) needs to be pretreated, that is, the hot melt adhesive (12) is extruded on one side of the polyethylene terephthalate (13), and then the nylon layer (11) is attached.
具体实施案例3：Specific implementation case 3:
如图3所示，为具体实施方式3的铝塑复合膜的结构示意图，其特征在于：其包括依次堆叠的外部保护层(1)、热熔胶层I(2)、中部铝箔层(3)、热熔胶层II(4)以及内部热封层(5)，其中内部热封层(5)为两种不同熔点的聚丙烯树脂的共挤层，且靠近锂离子电池的一侧为单层的聚丙烯树脂薄膜结构(52)，远离锂离子电池的一侧为多层的聚丙烯树脂薄膜结构(51)。As shown in FIG. 3, it is a schematic structural view of an aluminum-plastic composite film according to Embodiment 3, which is characterized in that it comprises an outer protective layer (1), a hot melt adhesive layer I(2), and a middle aluminum foil layer (3) which are sequentially stacked. ), hot melt adhesive layer II (4) and internal heat seal layer (5), wherein the inner heat seal layer (5) is a coextruded layer of two different melting point polypropylene resins, and the side close to the lithium ion battery is The single-layer polypropylene resin film structure (52), the side away from the lithium ion battery is a multilayer polypropylene resin film structure (51).
所述的外部保护层(1)为尼龙层(11)，厚度为28um。热熔胶层I(2)和热熔胶层II(4)为马来酸酐改性聚丙烯树酯为主体的热熔胶，热熔胶层I(2)和热熔胶层II(4)的厚度分别为4.9um。所述的铝箔层的厚度为28um。所述的内部热封层(5)中的两种不同熔点的聚丙烯树脂，为均聚聚丙烯树 脂，靠近锂离子电池的一侧的单层的聚丙烯树脂薄膜(52)的厚度为16um；远离锂离子电池的一侧的多层的聚丙烯树脂薄膜(51)的层数为8层，且每一层的厚度为11um。The outer protective layer (1) is a nylon layer (11) having a thickness of 28 um. Hot melt adhesive layer I (2) and hot melt adhesive layer II (4) are hot melt adhesives mainly composed of maleic anhydride modified polypropylene resin, hot melt adhesive layer I (2) and hot melt adhesive layer II (4) The thickness of each is 4.9 um. The aluminum foil layer has a thickness of 28 um. The two different melting point polypropylene resins in the inner heat seal layer (5) are homopolypropylene resins, and the thickness of the single layer polypropylene resin film (52) on the side close to the lithium ion battery is 16 μm. The multilayer polypropylene film (51) on the side away from the lithium ion battery has 8 layers, and each layer has a thickness of 11 um.
具体实施案例1中的铝塑复合膜的制备方法为：采用三层共挤的方式生产热熔胶层II(4)以及内部热封层(5)，其中共挤机器中的中间层中含有分配器，最后挤出的结果为中间层为八层聚丙烯树脂薄膜(51)，两边分别为马来酸酐改性的聚丙烯树脂薄膜(4)和单层聚丙烯树脂薄膜(52)；接着，将上一步中的挤出产品(4+51+52)的马来酸酐改性的聚丙烯树脂薄膜侧(4)与铝箔(3)直接贴合，经过降温后，再将铝箔(3)的另外一侧高温挤出马来酸酐改性的聚丙烯树脂(2)，并同时贴合保护层(11)。The aluminum-plastic composite film in the specific embodiment 1 is prepared by three-layer co-extrusion to produce a hot melt adhesive layer II (4) and an inner heat seal layer (5), wherein the intermediate layer in the co-extrusion machine contains The result of the final extrusion is that the intermediate layer is an eight-layer polypropylene resin film (51), and the two sides are a maleic anhydride-modified polypropylene resin film (4) and a single-layer polypropylene resin film (52); The maleic anhydride-modified polypropylene resin film side (4) of the extruded product (4+51+52) in the previous step is directly bonded to the aluminum foil (3), and after cooling, the aluminum foil (3) is further applied. On the other side, the maleic anhydride-modified polypropylene resin (2) is extruded at a high temperature, and at the same time, the protective layer (11) is attached.
以上所述实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对本发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。The above-mentioned embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims (10)

  1. 一种新型的铝塑复合膜，其特征在于：其包括依次堆叠的外部保护层、热熔胶层I、中部铝箔层、热熔胶层II以及内部热封层，其中内部热封层为两种不同熔点的聚丙烯树脂的共挤层，且靠近锂离子电池的一侧为单层的聚丙烯树脂薄膜结构，远离锂离子电池的一侧为多层的聚丙烯树脂薄膜结构。A novel aluminum-plastic composite film characterized in that it comprises an outer protective layer, a hot melt adhesive layer I, a middle aluminum foil layer, a hot melt adhesive layer II and an internal heat seal layer which are sequentially stacked, wherein the inner heat seal layer is two A coextruded layer of polypropylene resin of different melting points, and a side of the lithium ion battery is a single layer of a polypropylene resin film structure, and a side away from the lithium ion battery is a multilayer polypropylene film structure.
  2. 如权利要求1所述的新型的铝塑复合膜，其特征在于：所述的外部保护层为尼龙层，或聚对苯二甲酸乙二酯层，或者聚对苯二甲酸乙二酯层与尼龙层通过热熔胶层结合起来的多层结构。The novel aluminum-plastic composite film according to claim 1, wherein the outer protective layer is a nylon layer, or a polyethylene terephthalate layer, or a polyethylene terephthalate layer and A multi-layer structure in which a nylon layer is bonded by a hot melt adhesive layer.
  3. 如权利要求2所述的新型的铝塑复合膜，其特征在于：若外部保护层为尼龙层时，尼龙层的厚度15～30um；若外部保护层为聚对苯二甲酸乙二酯时，聚对苯二甲酸乙二酯的厚度为15～30um；若外部保护层为聚对苯二甲酸乙二酯层与尼龙层通过热熔胶结合起来的多层结构时，对苯二甲酸乙二酯层的厚度为10～30um，尼龙层的厚度为10～30um，热熔胶层3～15um。The novel aluminum-plastic composite film according to claim 2, wherein if the outer protective layer is a nylon layer, the thickness of the nylon layer is 15 to 30 um; and if the outer protective layer is polyethylene terephthalate, The thickness of the polyethylene terephthalate is 15-30 um; if the outer protective layer is a multilayer structure in which the polyethylene terephthalate layer and the nylon layer are combined by hot melt adhesive, the ethylene terephthalate The thickness of the ester layer is 10 to 30 um, the thickness of the nylon layer is 10 to 30 um, and the thickness of the hot melt adhesive layer is 3 to 15 um.
  4. 如权利要求1所述的新型的铝塑复合膜，其特征在于：所述的热熔胶层I和热熔胶层II为马来酸酐改性聚丙烯树酯为主体的热熔胶。The novel aluminum-plastic composite film according to claim 1, wherein the hot melt adhesive layer I and the hot melt adhesive layer II are hot melt adhesives mainly composed of maleic anhydride modified polypropylene resin.
  5. 如权利要求1所述的新型的铝塑复合膜，其特征在于：所述的热熔胶层I和热熔胶层II的厚度分别为3um～5um。The novel aluminum-plastic composite film according to claim 1, wherein the thickness of the hot melt adhesive layer I and the hot melt adhesive layer II is 3 um to 5 um, respectively.
  6. 如权利要求1所述的新型的铝塑复合膜，其特征在于：所述的铝箔层的厚10～60um。A novel aluminum-plastic composite film according to claim 1, wherein said aluminum foil layer has a thickness of 10 to 60 μm.
  7. 如权利要求1所述的新型的铝塑复合膜，其特征在于：所述的内部热封层中中的两种不同熔点的聚丙烯树脂，包括共聚聚丙烯树脂和均聚聚丙烯树脂。A novel aluminum-plastic composite film according to claim 1, wherein two of the different heat-melting polypropylene resins in the internal heat seal layer include a copolymerized polypropylene resin and a homopolypropylene resin.
  8. 如权利要求1所述的新型的铝塑复合膜，其特征在于：靠近锂离子电池的一侧的单层的聚丙烯树脂薄膜的厚度为5～30um；远离锂离子电池的一侧的多层的聚丙烯树脂薄膜的层数为2～12层，且每一层的厚度为10um～30um，远离锂离子电池的一侧的多层的聚丙烯薄膜的总厚度为20um～80um。A novel aluminum-plastic composite film according to claim 1, wherein a thickness of the single-layer polypropylene resin film on the side close to the lithium ion battery is 5 to 30 μm; and a plurality of layers away from the side of the lithium ion battery The number of layers of the polypropylene resin film is 2 to 12 layers, and the thickness of each layer is 10 um to 30 um, and the total thickness of the multilayer polypropylene film on the side far from the lithium ion battery is 20 um to 80 um.
  9. 如权利要求1～8中任意一项所述的铝塑复合膜的制备方法，包括如下步骤：采用三层共挤的方式生产热熔胶层II以及内部热封层，其中共挤机器中的中间层中含有分配器，最后挤出的结果为中间层为多层聚丙烯树脂 薄膜，两边分别为马来酸酐改性的聚丙烯树脂薄膜和单层聚丙烯树脂薄膜；接着，将上一步中的挤出产品的马来酸酐改性的聚丙烯树脂薄膜侧与铝箔直接贴合，经过降温后，再将铝箔的另外一侧高温挤出马来酸酐改性的聚丙烯树脂，并同时贴合保护层。The method for preparing an aluminum-plastic composite film according to any one of claims 1 to 8, comprising the steps of: producing a hot melt adhesive layer II and an internal heat seal layer by a three-layer co-extrusion method, wherein the co-extrusion machine The intermediate layer contains a dispenser, and finally, the result of the extrusion is that the intermediate layer is a multilayer polypropylene resin film, and the two sides are respectively a maleic anhydride-modified polypropylene resin film and a single-layer polypropylene resin film; then, in the previous step The maleic anhydride-modified polypropylene resin film side of the extruded product is directly bonded to the aluminum foil, and after cooling, the other side of the aluminum foil is extruded at a high temperature to the maleic anhydride-modified polypropylene resin, and simultaneously bonded. The protective layer.
  10. 如权利要求1～8中任意一项所述的铝塑复合膜的制备方法，包括如下步骤：采用双层共挤的方式生产内部热封层，其中挤出机器中的一层中含有分配器，最后挤出的结果为一边为单层聚丙烯树脂薄膜，另外一边为多层聚丙烯树脂薄膜；接着，将上一步中的挤出物延压降温后，在多层聚丙烯树脂薄膜的表面高温基础马来酸钙改性的聚丙烯树脂，同时贴合铝箔，经过降温后，再将铝箔的另外一侧高温挤出马来酸酐改性的聚丙烯树脂，并同时贴合保护层。The method for producing an aluminum-plastic composite film according to any one of claims 1 to 8, comprising the steps of: producing an internal heat seal layer by a two-layer coextrusion method, wherein a layer in the extrusion machine contains a dispenser The result of the final extrusion is that the one side is a single-layer polypropylene resin film, and the other side is a multilayer polypropylene resin film; then, the extrudate in the previous step is subjected to pressure reduction and cooling, on the surface of the multilayer polypropylene resin film. The high-temperature base maleic acid-modified polypropylene resin is bonded to the aluminum foil at the same time. After the temperature is lowered, the other side of the aluminum foil is extruded at a high temperature to the maleic anhydride-modified polypropylene resin, and the protective layer is bonded at the same time.
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