CN115257136A - Preparation method of aluminum-plastic composite film for improving aluminum leakage of molten adhesive - Google Patents

Preparation method of aluminum-plastic composite film for improving aluminum leakage of molten adhesive Download PDF

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Publication number
CN115257136A
CN115257136A CN202210946280.XA CN202210946280A CN115257136A CN 115257136 A CN115257136 A CN 115257136A CN 202210946280 A CN202210946280 A CN 202210946280A CN 115257136 A CN115257136 A CN 115257136A
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aluminum
layer
aluminum foil
extruder
film
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单化众
吕松
全鑫
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Changzhou Sveck Photovoltaic New Material Co ltd
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Changzhou Sveck Photovoltaic New Material Co ltd
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Priority to CN202210946280.XA priority Critical patent/CN115257136A/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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/04—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the partial melting of at least one 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284—Application of adhesive
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0008—Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0036—Heat treatment
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/16—Drying; Softening; Cleaning
    • B32B38/162—Cleaning
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/16—Drying; Softening; Cleaning
    • B32B38/164—Drying
    • 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
    • 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
    • H01M10/058—Construction or manufacture
    • 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
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
    • B32B2037/243—Coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
    • B32B2307/7145—Rot proof, resistant to bacteria, mildew, mould, fungi
    • 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
    • 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
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Plasma & Fusion (AREA)
  • Laminated Bodies (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

The invention provides a preparation method of an aluminum-plastic composite film for improving aluminum leakage of molten gel, which comprises the following steps: degreasing the aluminum foil layer; performing anticorrosive treatment operation on the aluminum foil layer; carrying out plasma surface treatment on the aluminum foil layer; spraying and repeating the polypropylene heat-sealing layer; and compounding the nylon outer protective layer and the aluminum foil layer-heat sealing layer composite semi-finished product by using an adhesive to obtain the aluminum-plastic composite film for improving the aluminum leakage of the molten adhesive. By the method, the bonding strength between the aluminum plastic film casting polypropylene film layer and the aluminum foil is high, and the problem of aluminum leakage of the common molten adhesive fed back by most of the current battery manufacturers can be solved. The lithium ion battery manufactured by the product has more stable safety performance, longer service life, high bonding strength and positive increase on the deep drawing forming performance; the peeling strength between the polypropylene film layer and the aluminum foil and the tensile property of the product are better, and the yield and the safety and reliability of the finished battery are improved.

Description

Preparation method of aluminum-plastic composite film for improving aluminum leakage of molten gel
Technical Field
The invention belongs to the technical field of composite films, and particularly relates to a preparation method of an aluminum-plastic composite film for improving aluminum leakage of molten gel.
Background
At present, the aluminum plastic film adopts the traditional thermal compounding process and is applied to the manufacture of batteries of most digital electronic products. Wherein, after the battery is heated and encapsulated through the plastic-aluminum film, when the glue melting effect is checked, the phenomenon that the polypropylene film layer and the aluminum foil layer are bonded firmly universally exists, aluminum leakage can occur after tearing, the condition not only can cause influence on the safety of the product, but also can reduce the service life of the battery.
Therefore, there is a need to develop an aluminum-plastic composite film for improving the leakage of molten gel, so as to solve the problem of leakage of molten gel fed back by most of the battery manufacturers.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of an aluminum-plastic composite film for improving the aluminum leakage of molten gel, and solving the technical problem.
In order to solve the technical problem, the invention provides a preparation method of an aluminum-plastic composite film for improving aluminum leakage of molten gel, which comprises the following steps:
(1) Deoiling of the aluminum foil layer: selecting a cold-rolled process aluminum foil with the thickness of 25-65 mu m, removing oil by using an oil removing agent, cleaning, and drying to obtain a clean aluminum foil;
(2) And (3) performing anticorrosive treatment operation on the aluminum foil layer: coating an anti-corrosion treatment agent on the bright surface and the matte surface of the clean aluminum foil by using a coating production line to form a clean aluminum foil with a high-density self-repairing film, wherein the thickness of the high-density self-repairing film is 200nm-1 mu m, drying the high-density self-repairing film by using an oven, and then rolling the high-density self-repairing film for later use;
(3) Plasma surface treatment of the aluminum foil layer: sending the clean aluminum foil with the high-density self-repairing film to a plasma processor from an unreeling mechanism to perform plasma corona treatment on a bright surface;
(4) And (3) carrying out polypropylene heat-sealing layer spraying and repeating operation: sending the aluminum foil subjected to the plasma corona treatment to a spraying and repeating mechanism, extruding a heat-sealing material by using a screw extruder of the spraying and repeating mechanism, extruding the heat-sealing material from a die head of the screw extruder, spraying the film to the bright surface, cooling the film by using a first cooling roller to obtain a double-layer co-extruded polypropylene cast film layer to form an aluminum foil layer-heat sealing layer composite semi-finished product, continuously performing secondary heating, melting and pressing on the aluminum foil layer-heat sealing layer composite semi-finished product, cooling the aluminum foil layer-heat sealing layer composite semi-finished product by using a second cooling roller, and rolling the aluminum foil layer-heat sealing layer composite semi-finished product for later use;
(5) And sending the aluminum foil layer-heat sealing layer composite semi-finished product and the nylon outer protective layer to a coating composite mechanism from an unreeling mechanism, and compounding the nylon outer protective layer and the aluminum foil layer-heat sealing layer composite semi-finished product through an adhesive, and carrying out heating reaction in an oven to obtain the aluminum-plastic composite film for improving the aluminum leakage of the molten adhesive.
As a preferable scheme of the preparation method of the aluminum-plastic composite film for improving the leakage of molten gel, in the step (1), the degreasing agent comprises a metal surfactant, a builder and water, the metal surfactant is any one of nonylphenol polyoxyethylene ether, polyoxyethylene octylphenol ether and triethanolamine oleate soap, the builder is sodium tripolyphosphate, the mass percentage of the metal surfactant in the degreasing agent is 16% -22%, and the mass percentage of the builder in the degreasing agent is 8% -15%.
As a preferable scheme of the preparation method of the aluminum-plastic composite film for improving the aluminum leakage of the molten gel, the anti-corrosion treating agent in the step (2) is trivalent chromium or trivalent cesium, the production running speed of the coating production line is 50m/min-120m/min, the heating temperature of the oven is 80 ℃ to 280 ℃, and the heating time is 2 seconds to 4 seconds.
As a preferable scheme of the preparation method of the aluminum-plastic composite film for improving the aluminum leakage of the molten gel, the power of the plasma corona treatment in the step (3) is 4kW, and the dyne value is more than or equal to 70 dynes after the plasma corona treatment.
As a preferable scheme of the preparation method of the aluminum-plastic composite film for improving the aluminum leakage of the molten gel, the production running speed of the spraying and repeating operation of the polypropylene heat-seal layer in the step (4) is 50-80 m/min.
As a preferable scheme of the preparation method of the aluminum-plastic composite film for improving the leakage of molten rubber, in the step (4), the screw extruder is a double-layer co-extrusion device, the double-layer co-extrusion device is provided with a No. 1 extruder and a No. 2 extruder, polypropylene raw material particles and POE raw material particles are added into the No. 1 extruder, and are mixed to obtain an outer layer raw material; adding maleic anhydride grafted polypropylene particles, POE elastic particles and LDPE particles into the No. 2 extruder, and mixing to obtain an inner layer raw material, wherein the processing temperature of the No. 1 extruder is 260 ℃, the internal pressure of the No. 2 extruder is 75bar, the processing temperature of the No. 2 extruder is 270 ℃, and the internal pressure of the No. 2 extruder is 90bar.
As a preferable scheme of the preparation method of the aluminum-plastic composite film for improving the aluminum leakage of the molten rubber, the mass percentages of the polypropylene raw material particles and the POE raw material particles are 90% and 10%, respectively, the grafting rate of the maleic anhydride grafted polypropylene particles is 5%, and the mass percentages of the maleic anhydride grafted polypropylene particles, the POE elastic particles and the LDPE particles are 85%, 10% and 5%, respectively.
As a preferable scheme of the preparation method of the aluminum-plastic composite film for improving the aluminum leakage of the molten adhesive, a No. 1 filtering device is arranged between the No. 1 extruder and the No. 1 film head, a No. 2 filtering device is arranged between the No. 2 extruder and the No. 2 film head, the number of filtering screens of the No. 1 filtering device and the No. 2 filtering device is 3-5, the mesh number of each filtering screen is 50-500 meshes/square inch, and the heating temperature of the No. 1 die head and the No. 2 die head is 275 ℃; the cooling temperature of the first cooling roller is 10-60 ℃, the diameter of the first cooling roller is 1000mm, the pressure of a compression roller is 0.3Mpa, the total thickness of the double-layer co-extrusion polypropylene casting film layer is 45 mu m, and the thickness ratio of the outer layer to the inner layer is 2:1.
as a preferable scheme of the preparation method of the aluminum-plastic composite film for improving the leakage of molten rubber, in the step (4), the secondary heating needs a first heating roller, a second heating roller and a third heating roller, the heating temperature of the first heating roller is 90 ℃, the heating temperature of the second heating roller is 170 ℃, the heating temperature of the third heating roller is 185 ℃, the diameters of the first heating roller, the second heating roller and the third heating roller are all 600mm, the cooling temperature of the second cooling roller is 28-35 ℃, the diameter of the second cooling roller is 600mm, and the pressing pressure is 0.15-0.25 MPa.
As a preferable scheme of the preparation method of the aluminum-plastic composite film for improving the leakage of molten adhesive, the adhesive in the step (5) is any one or more of polyurethane, isocyanate and epoxy resin, the heating temperature is 50-80 ℃, the heating time is 2-3 seconds, the production speed in the step (5) is 20-60 m/min, and the composite pressure is 0.15-0.25 MPa.
Compared with the prior aluminum-plastic composite film technology, the preparation method of the aluminum-plastic composite film for improving the aluminum leakage of the molten adhesive has the advantages that:
1. the polypropylene film layer and the aluminum foil layer are firmly bonded;
2. the product safety of the product is improved;
3. the service life of the battery is prolonged.
Detailed Description
The invention relates to an aluminum-plastic composite film for improving the aluminum leakage of molten gel, which comprises a cast polypropylene film heat-sealing layer, an aluminum foil layer and an outer protective layer which are sequentially arranged. The aluminum foil layer and the polypropylene film heat-sealing layer are manufactured by a thermal compounding process for thermal compounding, and the polypropylene film heat-sealing layer, the aluminum foil layer and the outer protection layer are compounded by heating and pressurizing.
The present invention will be described in further detail with reference to specific embodiments in order to make the above objects, features and advantages more apparent and understandable.
First, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The invention relates to a novel aluminum-plastic composite film for improving the aluminum leakage of molten gel, which comprises the following specific operation steps:
(1) Deoiling of the aluminum foil layer: degreasing and cleaning 25-65 mu m of cold-rolled technical aluminum foil by using a degreasing agent, and drying for later use; the main components of the oil remover are metal surfactant (one of nonylphenol polyoxyethylene ether, polyoxyethylene octylphenol ether and triethanolamine oleate soap), builder (sodium tripolyphosphate) and water, the combination of nonylphenol polyoxyethylene ether and sodium tripolyphosphate is generally selected, the cleaning effect can be obviously improved, and the mass percentages of the metal surfactant and the builder are respectively 16% -22% and 8% -15%.
(2) And (3) performing anticorrosive treatment operation on the aluminum foil layer: and sending the aluminum foil layer from the unwinding mechanism to a coating mechanism, coating an anti-corrosion treatment agent on the bright surface and the matte surface of the deoiled and dried aluminum foil by using a coating production line to form a high-density self-repairing film with the surface thickness of 200nm-1 mu m, heating the film in an oven at the temperature of 80-280 ℃ for reaction and drying for 2-4 seconds, and then rolling the film for later use. The production running speed of the coating production line is 50m/min-120m/min. The corrosion-resistant treating agent is generally treated by oxidation of trivalent chromium or trivalent cesium atoms, and trivalent cesium is recommended to be used, so that compared with a trivalent chromium oxidation product, the corrosion-resistant treating agent is non-toxic and environment-friendly.
(3) Plasma surface treatment: and sending the dried aluminum foil layer from the unwinding mechanism to a plasma processor, and carrying out plasma corona treatment on the bright surface of the aluminum foil, wherein the corona treatment power is 4kW. The surface dyne value of the aluminum foil base material which is not subjected to corona treatment is about 42, the surface dyne value can reach 70 dynes after the treatment, the stripping effect is best, is lower than 70 and higher than 60, the stripping force is reduced by about 20 percent and lower than 60 percent compared with the stripping force of the aluminum foil base material which is not subjected to corona treatment, and the stripping force is not greatly different from that of the aluminum foil base material which is not subjected to corona treatment and has no effect. In the step, the surface dyne value of the aluminum foil composite surface is increased, so that the peel strength after the composite is improved.
(4) And (3) spraying and repeating the polypropylene heat-sealing layer: and sending the aluminum foil layer from an ion processor to a spraying mechanism, extruding the heat-sealing material by using a screw extruder of the spraying mechanism, extruding the heat-sealing material from a die head of the screw extruder, and then spraying the film to the bright surface of the aluminum foil to form the aluminum foil layer-heat-sealing layer composite semi-finished product. The production running speed is 50m/min-80m/min. The process uses double-layer co-extrusion equipment with two extruders, wherein the two extruders are named as a No. 1 extruder and a No. 2 extruder respectively, and polypropylene raw material particles and POE raw material particles are added into the No. 1 extruder so as to obtain an outer layer raw material; adding maleic anhydride grafted polypropylene particles (with a grafting rate of 5%), POE elastic particles and LDPE particles into a No. 2 extruder to obtain an inner layer raw material; wherein, the mass percentages of the polypropylene raw material particles and the POE raw material particles in the No. 1 extruder are respectively 90 percent and 10 percent, and the mass percentages of the maleic anhydride grafted polypropylene particles, the POE elastic particles and the LDPE particles in the No. 2 extruder are respectively 85 percent, 10 percent and 5 percent. The processing temperature of the No. 1 extruder is set to be 260 ℃, the internal pressure of the No. 1 extruder is 75bar, the processing temperature of the No. 2 extruder is 270 ℃, the internal pressure of the No. 2 extruder is 90bar, a No. 1 filtering device and a No. 2 filtering device are respectively arranged between the extruder and a membrane head, 3-5 layers of filter screens are used, the mesh number of the filter screens is 50-500 meshes/square inch, the materials are extruded into a film forming die head by pushing of a screw rod and are formed into a film shape after passing through the membrane head, the flowing film-shaped resin is cooled by a first cooling roller to form a double-layer co-extruded polypropylene cast film, and the heating temperature of the die head is 275 ℃; the temperature of the first cooling roller is 10-60 ℃, the diameter of the cooling roller is 1000mm, the total thickness of the polypropylene casting film with the compression roller pressure of 0.3Mpa is 45 mu m, and the thickness-to-bottom ratio of the outer layer to the inner layer is 2:1, the outer layer is a heat sealing layer, the inner layer is a bonding layer, the two layers have different functions, the proportion of 2 is that the peeling force can reach the optimal selection after heat sealing and aluminum foil bonding, otherwise, if not, any layer is proportionally adjusted up, and the performance of the other layer is reduced.
And (3) continuously carrying out secondary heating, melting and laminating on the aluminum foil layer-heat sealing layer composite semi-finished product subjected to primary compounding to enhance the stripping force, and cooling and then winding the aluminum foil layer-heat sealing layer composite semi-finished product to a winding unit for later use. In the working procedure, the first heating roller, the second heating roller and the third heating roller are needed for secondary heating, the temperature of the first heating roller is 90 ℃, the temperature of the second heating roller is 170 ℃, the temperature of the third heating roller is 185 ℃, the diameters of the heating rollers are 600mm, the cooling temperature is 28-35 ℃, the diameter of the second cooling roller is 600mm, and the pressing pressure is 0.15-0.25 Mpa.
(5) Sending the aluminum foil layer-heat sealing layer composite semi-finished product and the nylon outer protective layer from the unreeling mechanism to the coating composite mechanism, compounding the nylon outer protective layer with an adhesive component and the aluminum foil layer-heat sealing layer composite semi-finished product, heating and reacting through an oven to obtain the semi-finished product, wherein the adhesive is one or more of polyurethanes, isocyanates and epoxy resins, aging is carried out at 55-90 ℃ to form a secondary reactant (allophanate) to enhance the bonding strength and the structural strength, the punching depth performance and the peeling strength are improved, the heating oven temperature is 50-80 ℃, the heating time is 2-3 seconds, the production speed is 20-60 m/min, and the compounding pressure is 0.15-0.25 MPa.
For specific embodiments and comparative examples, reference is made to the following comparative examples and examples:
comparative example 1
The invention relates to a novel aluminum-plastic composite film for improving the aluminum leakage of molten gel, which comprises the following specific operation steps:
(1) Deoiling of the aluminum foil layer: degreasing and cleaning a 50-micron cold-rolled technical aluminum foil by using a degreasing agent, and drying for later use; the oil remover mainly comprises 20 percent of nonylphenol polyoxyethylene ether, 10 percent of sodium tripolyphosphate and the balance of water.
(2) And (3) performing anticorrosive treatment operation on the aluminum foil layer: and (3) sending the aluminum foil layer from the unwinding mechanism to the coating mechanism, coating an anti-corrosion treatment agent on the bright smooth surface and the matte surface of the aluminum foil after deoiling and drying by using a coating production line to form a high-density self-repairing film with the surface thickness of 500nm, reacting and drying at the heating temperature of 180 ℃ through an oven for 3 seconds, and then rolling for later use. The production running speed of the coating production line is 70m/min. The corrosion preventing agent is subjected to oxidation treatment by trivalent cesium atoms.
(3) And (3) spraying and repeating the polypropylene heat-sealing layer: and sending the aluminum foil layer from an ion processor to a spraying mechanism, extruding the heat-sealing material by using a screw extruder of the spraying mechanism, extruding the heat-sealing material from a die head of the screw extruder, and then spraying the film to the bright surface of the aluminum foil to form the aluminum foil layer-heat-sealing layer composite semi-finished product. The production running speed is 70m/min. The process uses double-layer co-extrusion equipment with two extruders, wherein the two extruders are named as a No. 1 extruder and a No. 2 extruder respectively, and polypropylene raw material particles and POE raw material particles are added into the No. 1 extruder so as to obtain an outer layer raw material; adding maleic anhydride grafted polypropylene particles (with a grafting rate of 5%), POE elastic particles and LDPE particles into a No. 2 extruder to obtain an inner layer raw material; wherein, the mass percentages of the polypropylene raw material particles and the POE raw material particles in the No. 1 extruder are respectively 90 percent and 10 percent, and the mass percentages of the maleic anhydride grafted polypropylene particles, the POE elastic particles and the LDPE particles in the No. 2 extruder are respectively 85 percent, 10 percent and 5 percent. The processing temperature of the No. 1 extruder is set to be 260 ℃, the internal pressure of the No. 1 extruder is 75bar, the processing temperature of the No. 2 extruder is 270 ℃, the internal pressure of the No. 2 extruder is 90bar, a No. 1 filtering device and a No. 2 filtering device are respectively arranged between the extruder and a membrane head, the number of used filter screens is 4, the mesh number of the filter screens is 300 meshes/square inch, the materials are extruded into a film forming die head through the pushing of a screw rod and form a film shape after passing through the membrane head, the flowing film-shaped resin is cooled by a first cooling roller to form a double-layer co-extruded polypropylene cast film, and the heating temperature of the die head is 275 ℃; the temperature of the first cooling roller is 50 ℃, the diameter of the cooling roller is 1000mm, the total thickness of the polypropylene cast film with the compression roller pressure of 0.3Mpa is 45 mu m, and the thickness-to-bottom ratio of the outer layer to the inner layer is 2:1.
and (3) continuously carrying out secondary heating, melting and laminating on the aluminum foil layer-heat sealing layer composite semi-finished product subjected to primary compounding to enhance the stripping force, and cooling and then winding the product to a winding unit for later use. In the working procedure, the first heating roller, the second heating roller and the third heating roller are needed for secondary heating, the temperature of the first heating roller is 90 ℃, the temperature of the second heating roller is 170 ℃, the temperature of the third heating roller is 185 ℃, the diameters of the heating rollers are all 600mm, the cooling temperature is 30 ℃, the diameter of the second cooling roller is 600mm, and the pressing pressure is 0.20Mpa.
(4) Sending the aluminum foil layer-heat sealing layer composite semi-finished product and the nylon outer protective layer from the unreeling mechanism to the coating composite mechanism, compounding the nylon outer protective layer with an adhesive component and the aluminum foil layer-heat sealing layer composite semi-finished product, and heating and reacting in an oven to obtain the semi-finished product, wherein the adhesive is polyurethane, the temperature of the heating oven is 70 ℃, the heating time is 2.5 seconds, the production speed is 40m/min, and the compounding pressure is 0.20Mpa.
Comparative example 2
The invention relates to a novel aluminum-plastic composite film for improving the aluminum leakage of molten gel, which comprises the following specific operation steps:
(1) Deoiling of the aluminum foil layer: removing oil from a 50-micron cold-rolled technical aluminum foil by using an oil removing agent, and drying for later use; the oil remover mainly comprises 20 percent of nonylphenol polyoxyethylene ether, 10 percent of sodium tripolyphosphate and the balance of water.
(2) And (3) performing anticorrosive treatment operation on the aluminum foil layer: and sending the aluminum foil layer from the unwinding mechanism to a coating mechanism, coating an anti-corrosion treatment agent on the bright smooth surface and the matte surface of the deoiled and dried aluminum foil by using a coating production line to form a high-density self-repairing film with the surface thickness of 500nm, reacting and drying at the heating temperature of 180 ℃ through an oven for 3 seconds, and then rolling for later use. The production running speed of the coating production line is 70m/min. The corrosion-preventing treatment agent is subjected to oxidation treatment by using trivalent cesium atoms.
(3) Plasma surface treatment: and (3) sending the dried aluminum foil layer from the unwinding mechanism to a plasma processor, and carrying out plasma corona treatment on the bright surface of the aluminum foil, wherein the corona treatment power is 4kW.
(4) And (3) spraying and repeating the polypropylene heat-sealing layer: and sending the aluminum foil layer from an ion processor to a spraying mechanism, extruding the heat-sealing material by using a screw extruder of the spraying mechanism, extruding the heat-sealing material from a die head of the screw extruder, and then spraying the film to the bright surface of the aluminum foil to form the aluminum foil layer-heat-sealing layer composite semi-finished product. The production running speed is 70m/min. The process uses double-layer co-extrusion equipment with two extruders, wherein the two extruders are named as a No. 1 extruder and a No. 2 extruder respectively, and polypropylene raw material particles are added into the No. 1 extruder, so that an outer layer raw material is obtained; maleic anhydride-grafted polypropylene particles (grafting ratio: 5%) were fed into a No. 2 extruder to obtain an inner layer log. The processing temperature of the No. 1 extruder is set to be 260 ℃, the internal pressure of the No. 1 extruder is 75bar, the processing temperature of the No. 2 extruder is 270 ℃, the internal pressure of the No. 2 extruder is 90bar, a No. 1 filtering device and a No. 2 filtering device are respectively arranged between the extruder and a membrane head, the number of used filter screens is 4, the mesh number of the filter screens is 300 meshes/square inch, the materials are extruded into a film forming die head through the pushing of a screw rod and form a film shape after passing through the membrane head, the flowing film-shaped resin is cooled by a first cooling roller to form a double-layer co-extruded polypropylene cast film, and the heating temperature of the die head is 275 ℃; the temperature of the first cooling roller is 50 ℃, the diameter of the cooling roller is 1000mm, the total thickness of the polypropylene cast film with the compression roller pressure of 0.3Mpa is 45 mu m, and the thickness-to-bottom ratio of the outer layer to the inner layer is 2:1.
and (3) continuously carrying out secondary heating, melting and laminating on the aluminum foil layer-heat sealing layer composite semi-finished product subjected to primary compounding to enhance the stripping force, and cooling and then winding the aluminum foil layer-heat sealing layer composite semi-finished product to a winding unit for later use. In the working procedure, the first heating roller, the second heating roller and the third heating roller are needed for secondary heating, the temperature of the first heating roller is 90 ℃, the temperature of the second heating roller is 170 ℃, the temperature of the third heating roller is 185 ℃, the diameters of the heating rollers are all 600mm, the cooling temperature is 30 ℃, the diameter of the second cooling roller is 600mm, and the pressing pressure is 0.20Mpa.
(5) Sending the aluminum foil layer-heat sealing layer composite semi-finished product and the nylon outer protective layer from the unreeling mechanism to the coating composite mechanism, compounding the nylon outer protective layer with an adhesive component and the aluminum foil layer-heat sealing layer composite semi-finished product, and heating and reacting in an oven to obtain the semi-finished product, wherein the adhesive is polyurethane, the temperature of the heating oven is 70 ℃, the heating time is 2.5 seconds, the production speed is 40m/min, and the compounding pressure is 0.20Mpa.
Comparative example 3
The invention relates to a novel aluminum-plastic composite film for improving the aluminum leakage of molten gel, which comprises the following specific operation steps:
(1) Deoiling of the aluminum foil layer: removing oil from a 50-micron cold-rolled technical aluminum foil by using an oil removing agent, and drying for later use; the main components of the oil removing agent are nonyl phenol polyoxyethylene ether 20%, sodium tripolyphosphate 10%, and the balance water.
(2) And (3) performing anticorrosive treatment operation on the aluminum foil layer: and (3) sending the aluminum foil layer from the unwinding mechanism to the coating mechanism, coating an anti-corrosion treatment agent on the bright smooth surface and the matte surface of the aluminum foil after deoiling and drying by using a coating production line to form a high-density self-repairing film with the surface thickness of 500nm, reacting and drying at the heating temperature of 180 ℃ through an oven for 3 seconds, and then rolling for later use. The production running speed of the coating production line is 70m/min. The corrosion-preventing treatment agent is subjected to oxidation treatment by using trivalent cesium atoms.
(3) Plasma surface treatment: and sending the dried aluminum foil layer from the unwinding mechanism to a plasma processor, and carrying out plasma corona treatment on the bright surface of the aluminum foil, wherein the corona treatment power is 4kW.
(4) And (3) carrying out polypropylene heat-sealing layer spraying and repeating operation: and sending the aluminum foil layer from an ion processor to a spraying mechanism, extruding the heat-sealing material by using a screw extruder of the spraying mechanism, extruding the heat-sealing material from a die head of the screw extruder, and then spraying the film to the bright surface of the aluminum foil to form the aluminum foil layer-heat-sealing layer composite semi-finished product. The production running speed is 70m/min. The process uses double-layer co-extrusion equipment with two extruders, wherein the two extruders are named as a No. 1 extruder and a No. 2 extruder respectively, and polypropylene raw material particles and POE raw material particles are added into the No. 1 extruder so as to obtain an outer layer raw material; adding maleic anhydride grafted polypropylene particles (the grafting rate is 3 percent), POE elastic particles and LDPE particles into a No. 2 extruder to obtain an inner layer raw material; wherein, the mass percentages of the polypropylene raw material particles and the POE raw material particles in the No. 1 extruder are respectively 90 percent and 10 percent, and the mass percentages of the maleic anhydride grafted polypropylene particles, the POE elastic particles and the LDPE particles in the No. 2 extruder are respectively 85 percent, 10 percent and 5 percent. The processing temperature of the No. 1 extruder is set to be 260 ℃, the internal pressure of the No. 1 extruder is 75bar, the processing temperature of the No. 2 extruder is 270 ℃, the internal pressure of the No. 2 extruder is 90bar, a No. 1 filtering device and a No. 2 filtering device are respectively arranged between the extruder and a membrane head, the number of used filter screens is 4, the mesh number of the filter screens is 300 meshes/square inch, the materials are extruded into a film forming die head through the pushing of a screw rod and form a film shape after passing through the membrane head, the flowing film-shaped resin is cooled by a first cooling roller to form a double-layer co-extruded polypropylene cast film, and the heating temperature of the die head is 275 ℃; the temperature of the first cooling roller is 50 ℃, the diameter of the cooling roller is 1000mm, the total thickness of the polypropylene cast film with the compression roller pressure of 0.3Mpa is 45 mu m, and the thickness-to-bottom ratio of the outer layer to the inner layer is 2:1..
And (3) continuously carrying out secondary heating, melting and laminating on the aluminum foil layer-heat sealing layer composite semi-finished product subjected to primary compounding to enhance the stripping force, and cooling and then winding the product to a winding unit for later use. In the working procedure, the first heating roller, the second heating roller and the third heating roller are needed for secondary heating, the temperature of the first heating roller is 90 ℃, the temperature of the second heating roller is 170 ℃, the temperature of the third heating roller is 185 ℃, the diameters of the heating rollers are all 600mm, the cooling temperature is 30 ℃, the diameter of the second cooling roller is 600mm, and the pressing pressure is 0.20Mpa.
(5) Sending the aluminum foil layer-heat sealing layer composite semi-finished product and the nylon outer protective layer from the unwinding mechanism to a coating composite mechanism, compounding the nylon outer protective layer with an adhesive component and the aluminum foil layer-heat sealing layer composite semi-finished product, and heating the semi-finished product in an oven for reaction to obtain the semi-finished product, wherein the adhesive is polyurethane, the temperature of the heating oven is 70 ℃, the heating time is 2.5 seconds, the production speed is 40m/min, and the composite pressure is 0.20Mpa.
Example 1
The invention relates to a novel aluminum-plastic composite film for improving the aluminum leakage of molten gel, which comprises the following specific operation steps:
(1) Deoiling of the aluminum foil layer: degreasing and cleaning a 50-micron cold-rolled technical aluminum foil by using a degreasing agent, and drying for later use; the oil remover mainly comprises 20 percent of nonylphenol polyoxyethylene ether, 10 percent of sodium tripolyphosphate and the balance of water.
(2) And (3) performing anticorrosive treatment operation on the aluminum foil layer: and (3) sending the aluminum foil layer from the unwinding mechanism to the coating mechanism, coating an anti-corrosion treatment agent on the bright smooth surface and the matte surface of the aluminum foil after deoiling and drying by using a coating production line to form a high-density self-repairing film with the surface thickness of 500nm, reacting and drying at the heating temperature of 180 ℃ through an oven for 3 seconds, and then rolling for later use. The production running speed of the coating production line is 70m/min. The corrosion preventing agent is subjected to oxidation treatment by trivalent cesium atoms.
(3) Plasma surface treatment: and sending the dried aluminum foil layer from the unwinding mechanism to a plasma processor, and carrying out plasma corona treatment on the bright surface of the aluminum foil, wherein the corona treatment power is 4kW.
(4) And (3) carrying out polypropylene heat-sealing layer spraying and repeating operation: and sending the aluminum foil layer from an ion processor to a spraying mechanism, extruding the heat-sealing material by using a screw extruder of the spraying mechanism, extruding the heat-sealing material from a die head of the screw extruder, and then spraying the film to the bright surface of the aluminum foil to form the aluminum foil layer-heat-sealing layer composite semi-finished product. The production running speed is 70m/min. The process uses double-layer co-extrusion equipment with two extruders, wherein the two extruders are named as a No. 1 extruder and a No. 2 extruder respectively, and polypropylene raw material particles and POE raw material particles are added into the No. 1 extruder so as to obtain an outer layer raw material; adding maleic anhydride grafted polypropylene particles (with a grafting rate of 5%), POE elastic particles and LDPE particles into a No. 2 extruder to obtain an inner layer raw material; wherein, the mass percentages of the polypropylene raw material particles and the POE raw material particles in the No. 1 extruder are respectively 90 percent and 10 percent, and the mass percentages of the maleic anhydride grafted polypropylene particles, the POE elastic particles and the LDPE particles in the No. 2 extruder are respectively 85 percent, 10 percent and 5 percent. The processing temperature of the No. 1 extruder is set to be 260 ℃, the internal pressure of the No. 1 extruder is 75bar, the processing temperature of the No. 2 extruder is 270 ℃, the internal pressure of the No. 2 extruder is 90bar, a No. 1 filtering device and a No. 2 filtering device are respectively arranged between the extruder and a membrane head, the number of used filter screens is 4, the mesh number of the filter screens is 300 meshes/square inch, the materials are extruded into a film forming die head through the pushing of a screw rod and form a film shape after passing through the membrane head, the flowing film-shaped resin is cooled by a first cooling roller to form a double-layer co-extruded polypropylene cast film, and the heating temperature of the die head is 275 ℃; the temperature of the first cooling roller is 50 ℃, the diameter of the cooling roller is 1000mm, the total thickness of the polypropylene casting film with the compression roller pressure of 0.3Mpa is 45 mu m, and the thickness-to-bottom ratio of the outer layer to the inner layer is 2:1.
and (3) continuously carrying out secondary heating, melting and laminating on the aluminum foil layer-heat sealing layer composite semi-finished product subjected to primary compounding to enhance the stripping force, and cooling and then winding the product to a winding unit for later use. In the working procedure, the first heating roller, the second heating roller and the third heating roller are needed for secondary heating, the temperature of the first heating roller is 90 ℃, the temperature of the second heating roller is 170 ℃, the temperature of the third heating roller is 185 ℃, the diameters of the heating rollers are all 600mm, the cooling temperature is 30 ℃, the diameter of the second cooling roller is 600mm, and the pressing pressure is 0.20Mpa.
(5) Sending the aluminum foil layer-heat sealing layer composite semi-finished product and the nylon outer protective layer from the unreeling mechanism to the coating composite mechanism, compounding the nylon outer protective layer with an adhesive component and the aluminum foil layer-heat sealing layer composite semi-finished product, and heating and reacting in an oven to obtain the semi-finished product, wherein the adhesive is polyurethane, the temperature of the heating oven is 70 ℃, the heating time is 2.5 seconds, the production speed is 40m/min, and the compounding pressure is 0.20Mpa.
Example 2
The invention relates to a novel aluminum-plastic composite film for improving the aluminum leakage of molten gel, which comprises the following specific operation steps:
(1) Deoiling of the aluminum foil layer: degreasing and cleaning 25 mu m of cold-rolled technical aluminum foil by using a degreasing agent, and drying for later use; the main components of the oil removing agent are metal surfactant (polyoxyethylene octyl phenol ether), builder (sodium tripolyphosphate) and water, and the mass percentages of the metal surfactant and the builder are respectively 16% and 15%.
(2) And (3) performing anticorrosive treatment operation on the aluminum foil layer: and (3) sending the aluminum foil layer from the unwinding mechanism to the coating mechanism, coating an anti-corrosion treatment agent on the bright smooth surface and the matte surface of the aluminum foil after deoiling and drying by using a coating production line to form a high-density self-repairing film with the surface thickness of 200nm, reacting and drying at the heating temperature of 80 ℃ through an oven for 4 seconds, and then rolling for later use. The production running speed of the coating production line is 50m/min. The anticorrosive treatment agent is generally an oxidation treatment using trivalent chromium atoms.
(3) Plasma surface treatment: and sending the dried aluminum foil layer from the unwinding mechanism to a plasma processor, and carrying out plasma corona treatment on the bright surface of the aluminum foil, wherein the corona treatment power is 4kW.
(4) And (3) spraying and repeating the polypropylene heat-sealing layer: and sending the aluminum foil layer from an ion processor to a spraying mechanism, extruding the heat-sealing material by using a screw extruder of the spraying mechanism, extruding the heat-sealing material from a die head of the screw extruder, and then spraying the film to the bright surface of the aluminum foil to form the aluminum foil layer-heat-sealing layer composite semi-finished product. The production running speed is 50m/min. The process uses double-layer co-extrusion equipment with two extruders, wherein the two extruders are named as a No. 1 extruder and a No. 2 extruder respectively, and polypropylene raw material particles and POE raw material particles are added into the No. 1 extruder so as to obtain an outer layer raw material; adding maleic anhydride grafted polypropylene particles (with a grafting rate of 5 percent), POE elastic particles and LDPE particles into a No. 2 extruder to obtain an inner layer raw material; wherein, the mass percentages of the polypropylene raw material particles and the POE raw material particles in the No. 1 extruder are respectively 90 percent and 10 percent, and the mass percentages of the maleic anhydride grafted polypropylene particles, the POE elastic particles and the LDPE particles in the No. 2 extruder are respectively 85 percent, 10 percent and 5 percent. The processing temperature of the No. 1 extruder is set to be 260 ℃, the internal pressure of the No. 1 extruder is 75bar, the processing temperature of the No. 2 extruder is 270 ℃, the internal pressure of the No. 2 extruder is 90bar, a No. 1 filtering device and a No. 2 filtering device are respectively arranged between the extruder and the film head, the used filtering screens are 3 layers, the mesh number of the filtering screens is 50 meshes/square inch, the materials are extruded into a film forming die head through the pushing of a screw rod, the materials form a film after passing through the film head, the film resin which flows out forms a double-layer co-extrusion polypropylene cast film after being cooled by a first cooling roller, and the heating temperature of the die head is 275 ℃; the temperature of the first cooling roller is 10 ℃, the diameter of the cooling roller is 1000mm, the total thickness of the polypropylene cast film with the pressure of 0.3Mpa is 45 mu m, and the thickness-to-bottom ratio of the outer layer to the inner layer is 2:1.
and (3) continuously carrying out secondary heating, melting and laminating on the aluminum foil layer-heat sealing layer composite semi-finished product subjected to primary compounding to enhance the stripping force, and cooling and then winding the product to a winding unit for later use. In the process, the first heating roller, the second heating roller and the third heating roller are needed for secondary heating, the temperature of the first heating roller is 90 ℃, the temperature of the second heating roller is 170 ℃, the temperature of the third heating roller is 185 ℃, the diameters of the heating rollers are 600mm, the cooling temperature is 28 ℃, the diameter of the second cooling roller is 600mm, and the pressing pressure is 0.15Mpa.
Sending the aluminum foil layer-heat sealing layer composite semi-finished product and the nylon outer protective layer from the unreeling mechanism to the coating composite mechanism, compounding the nylon outer protective layer with an adhesive component and the aluminum foil layer-heat sealing layer composite semi-finished product, and heating and reacting in an oven to obtain the semi-finished product, wherein the adhesive is isocyanate, the temperature of the heating oven is 50 ℃, the heating time is 2 seconds, the production speed is 20m/min, and the compounding pressure is 0.15Mpa.
Example 3
The invention relates to a novel aluminum-plastic composite film for improving the aluminum leakage of molten gel, which comprises the following specific operation steps:
(1) Deoiling of the aluminum foil layer: degreasing and cleaning 65 mu m cold-rolled technical aluminum foil by using a degreasing agent, and drying for later use; the main components of the oil removing agent are a metal surfactant (triethanolamine oleic soap), a builder (sodium tripolyphosphate) and water, and the mass percentages of the metal surfactant and the builder are 22% and 8% respectively.
(2) And (3) performing anticorrosive treatment operation on the aluminum foil layer: and (3) sending the aluminum foil layer from the unwinding mechanism to the coating mechanism, coating an anti-corrosion treatment agent on the bright smooth surface and the matte surface of the aluminum foil after deoiling and drying by using a coating production line to form a high-density self-repairing film with the surface thickness of 1 mu m, reacting and drying at the heating temperature of 280 ℃ through an oven for 2 seconds, and then rolling for later use. The production running speed of the coating production line is 120m/min. The preservative treatment agent is generally subjected to oxidation treatment using trivalent cesium atoms.
(3) Plasma surface treatment: and sending the dried aluminum foil layer from the unwinding mechanism to a plasma processor, and carrying out plasma corona treatment on the bright surface of the aluminum foil, wherein the corona treatment power is 4kW.
(4) And (3) carrying out polypropylene heat-sealing layer spraying and repeating operation: and sending the aluminum foil layer from an ion processor to a spraying mechanism, extruding the heat-sealing material by using a screw extruder of the spraying mechanism, extruding the heat-sealing material from a die head of the screw extruder, and then spraying the film to the bright surface of the aluminum foil to form the aluminum foil layer-heat-sealing layer composite semi-finished product. The production running speed is 80m/min. The process uses double-layer co-extrusion equipment with two extruders, wherein the two extruders are named as a No. 1 extruder and a No. 2 extruder respectively, and polypropylene raw material particles and POE raw material particles are added into the No. 1 extruder so as to obtain an outer layer raw material; adding maleic anhydride grafted polypropylene particles (with a grafting rate of 5%), POE elastic particles and LDPE particles into a No. 2 extruder to obtain an inner layer raw material; wherein, the mass percentages of the polypropylene raw material particles and the POE raw material particles in the No. 1 extruder are respectively 90 percent and 10 percent, and the mass percentages of the maleic anhydride grafted polypropylene particles, the POE elastic particles and the LDPE particles in the No. 2 extruder are respectively 85 percent, 10 percent and 5 percent. The processing temperature of the No. 1 extruder is set to be 260 ℃, the internal pressure of the No. 1 extruder is 75bar, the processing temperature of the No. 2 extruder is 270 ℃, the internal pressure of the No. 2 extruder is 90bar, a No. 1 filtering device and a No. 2 filtering device are respectively arranged between the extruder and a membrane head, the number of used filtering screens is 5, the number of the filtering screens is 500 meshes/square inch, the materials are extruded into a film forming die head through the pushing of a screw rod and form a film shape after passing through the membrane head, the flowing film-shaped resin is cooled by a first cooling roller to form a double-layer co-extruded polypropylene cast film, and the heating temperature of the die head is 275 ℃; the temperature of the first cooling roller is 60 ℃, the diameter of the cooling roller is 1000mm, the total thickness of the polypropylene casting film with the compression roller pressure of 0.3Mpa is 45 mu m, and the thickness-to-bottom ratio of the outer layer to the inner layer is 2:1.
and (3) continuously carrying out secondary heating, melting and laminating on the aluminum foil layer-heat sealing layer composite semi-finished product subjected to primary compounding to enhance the stripping force, and cooling and then winding the product to a winding unit for later use. In the process, the first heating roller, the second heating roller and the third heating roller are needed for secondary heating, the temperature of the first heating roller is 90 ℃, the temperature of the second heating roller is 170 ℃, the temperature of the third heating roller is 185 ℃, the diameters of the heating rollers are all 600mm, the cooling temperature is 35 ℃, the diameter of the second cooling roller is 600mm, and the pressing pressure is 0.25Mpa.
(5) Sending the aluminum foil layer-heat sealing layer composite semi-finished product and the nylon outer protective layer from the unreeling mechanism to the coating composite mechanism, compounding the nylon outer protective layer with an adhesive component and the aluminum foil layer-heat sealing layer composite semi-finished product, and heating and reacting in an oven to obtain the semi-finished product, wherein the adhesive is epoxy resin, the temperature of the heating oven is 80 ℃, the heating time is 3 seconds, the production speed is 60m/min, and the compounding pressure is 0.25Mpa.
Comparative examples, examples test results are shown in tables 1 to 3 below.
Figure BDA0003787480300000141
TABLE 1
Figure BDA0003787480300000142
TABLE 2
Figure BDA0003787480300000143
Figure BDA0003787480300000151
TABLE 3
From the data in table 1, comparative example 1 to comparative example 1 found that the product without plasma surface treatment had inferior transverse and longitudinal peel strength, transverse and longitudinal elongation at break, and ultimate drawing depth capability to those of the product with plasma surface treatment; from the data in Table 2, comparative example 1 and comparative example 1 show that the transverse and longitudinal peel strength, transverse and longitudinal elongation at break and ultimate drawing depth of the product without POE elastomer and LDPE in the fourth step are all inferior to those of the product with POE elastomer and LDPE in the fourth step; from the data in Table 3, comparative example 1 to comparative example 1, it was found that the transverse and longitudinal peel strength, transverse and longitudinal elongation at break, and ultimate drawing depth ability of the product having a maleic anhydride grafting ratio of 3% in step four were inferior to those of the product having a maleic anhydride grafting ratio of 5% in step four. Therefore, the 3 tables prove that the peeling strength between the polypropylene film layer and the aluminum foil and the tensile property of the product are better in the technical scheme.
Therefore, the aluminum-plastic composite film for improving the molten gel aluminum leakage has the advantages that the adhesive strength between the aluminum-plastic film casting polypropylene film layer and the aluminum foil is high, and the problem of molten gel aluminum leakage fed back by most of the battery manufacturers at present can be solved. The lithium ion battery made of the product has more stable safety performance, longer service life and high bonding strength, and the deep punching forming performance of the lithium ion battery is positively increased, so that the yield and the safety and reliability of finished batteries are improved, and the lithium ion battery can be applied to the batteries more durably and safely.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.

Claims (10)

1. A preparation method of an aluminum-plastic composite film for improving the aluminum leakage of molten gel is characterized by comprising the following steps:
(1) Deoiling of the aluminum foil layer: selecting a cold-rolled process aluminum foil with the thickness of 25-65 mu m, using a degreasing agent to remove oil, cleaning and drying to obtain a clean aluminum foil;
(2) And (3) performing anticorrosive treatment operation on the aluminum foil layer: coating an anti-corrosion treatment agent on the bright surface and the matte surface of the clean aluminum foil by using a coating production line to form a clean aluminum foil with a high-density self-repairing film, wherein the thickness of the high-density self-repairing film is 200nm-1 mu m, drying the high-density self-repairing film by using an oven, and then rolling the high-density self-repairing film for later use;
(3) And (3) carrying out plasma surface treatment on the aluminum foil layer: sending the clean aluminum foil with the high-density self-repairing film to a plasma processor through an unreeling mechanism, and carrying out plasma corona treatment on a bright surface;
(4) And (3) spraying and repeating the polypropylene heat-sealing layer: sending the aluminum foil subjected to the plasma corona treatment to a spraying mechanism, extruding a heat-sealing material by using a screw extruder of the spraying mechanism, extruding the heat-sealing material from a die head of the screw extruder, spraying the film to the bright surface, cooling by using a first cooling roller to obtain a double-layer co-extrusion polypropylene cast film layer to form an aluminum foil layer-heat sealing layer composite semi-finished product, continuously carrying out secondary heating, melting and laminating on the aluminum foil layer-heat sealing layer composite semi-finished product, cooling by using a second cooling roller, and rolling for later use;
(5) And sending the aluminum foil layer-heat sealing layer composite semi-finished product and the nylon outer protective layer to a coating composite mechanism from an unwinding mechanism, compounding the nylon outer protective layer and the aluminum foil layer-heat sealing layer composite semi-finished product through an adhesive, and heating and reacting through an oven to obtain the aluminum-plastic composite film for improving aluminum leakage of the molten gel.
2. The method for preparing the aluminum-plastic composite film for improving the aluminum leakage of the molten gel according to claim 1, wherein the method comprises the following steps: the degreasing agent in the step (1) comprises a metal surfactant, a builder and water, wherein the metal surfactant is any one of nonylphenol polyoxyethylene ether, polyoxyethylene octylphenol ether and triethanolamine oleate soap, the builder is sodium tripolyphosphate, the mass percentage of the metal surfactant in the degreasing agent is 16% -22%, and the mass percentage of the builder in the degreasing agent is 8% -15%.
3. The method for preparing the aluminum-plastic composite film for improving the aluminum leakage of the molten gel according to claim 1, which is characterized in that: in the step (2), the preservative treatment agent is trivalent chromium or trivalent cesium, the production running speed of the coating production line is 50-120 m/min, the heating temperature of the oven is 80-280 ℃, and the heating time is 2-4 seconds.
4. The method for preparing the aluminum-plastic composite film for improving the aluminum leakage of the molten gel according to claim 1, which is characterized in that: the power of the plasma corona treatment in the step (3) is 4kW, and after the plasma corona treatment, the dyne value is greater than or equal to 70 dynes.
5. The method for preparing the aluminum-plastic composite film for improving the aluminum leakage of the molten gel according to claim 1, wherein the method comprises the following steps: the production running speed of the polypropylene heat-sealing layer spraying and repeating operation in the step (4) is 50-80 m/min.
6. The method for preparing the aluminum-plastic composite film for improving the aluminum leakage of the molten gel according to claim 1, wherein the method comprises the following steps: the screw extruder in the step (4) is double-layer co-extrusion equipment, the double-layer co-extrusion equipment is provided with a No. 1 extruder and a No. 2 extruder, and polypropylene raw material particles and POE raw material particles are added into the No. 1 extruder and mixed to obtain an outer layer raw material; adding maleic anhydride grafted polypropylene particles, POE elastic particles and LDPE particles into the No. 2 extruder, and mixing to obtain an inner layer raw material, wherein the processing temperature of the No. 1 extruder is 260 ℃, the internal pressure of the No. 2 extruder is 75bar, the processing temperature of the No. 2 extruder is 270 ℃, and the internal pressure of the No. 2 extruder is 90bar.
7. The method for preparing the aluminum-plastic composite film for improving the aluminum leakage of the molten gel according to claim 6, wherein the method comprises the following steps: the mass percentages of the polypropylene raw material particles and the POE raw material particles are respectively 90% and 10%, the grafting rate of the maleic anhydride grafted polypropylene particles is 5%, and the mass percentages of the maleic anhydride grafted polypropylene particles, the POE elastic particles and the LDPE particles are respectively 85%, 10% and 5%.
8. The method for preparing the aluminum-plastic composite film for improving the aluminum leakage of the molten gel according to claim 6, wherein the method comprises the following steps: a No. 1 filtering device is arranged between the No. 1 extruder and the No. 1 membrane head, a No. 2 filtering device is arranged between the No. 2 extruder and the No. 2 membrane head, the number of filter screens of the No. 1 filtering device and the No. 2 filtering device is 3-5, the mesh number of each filter screen is 50-500 meshes/square inch, and the heating temperature of the No. 1 die head and the No. 2 die head is 275 ℃; the cooling temperature of the first cooling roller is 10-60 ℃, the diameter of the first cooling roller is 1000mm, the pressure of the compression roller is 0.3Mpa, the total thickness of the double-layer co-extrusion polypropylene casting film layer is 45 μm, and the thickness ratio of the outer layer to the inner layer is 2:1.
9. the method for preparing the aluminum-plastic composite film for improving the aluminum leakage of the molten gel according to claim 1, which is characterized in that: in the step (4), the secondary heating needs a first heating roller, a second heating roller and a third heating roller, the heating temperature of the first heating roller is 90 ℃, the heating temperature of the second heating roller is 170 ℃, the heating temperature of the third heating roller is 185 ℃, the diameters of the first heating roller, the second heating roller and the third heating roller are all 600mm, the cooling temperature of the second cooling roller is 28-35 ℃, the diameter of the second cooling roller is 600mm, and the pressing pressure is 0.15-0.25 Mpa.
10. The method for preparing the aluminum-plastic composite film for improving the aluminum leakage of the molten gel according to claim 1, wherein the method comprises the following steps: the adhesive in the step (5) is any one or more of polyurethanes, isocyanates and epoxy resins, the heating temperature is 50-80 ℃, the heating time is 2-3 seconds, the production speed in the step (5) is 20-60 m/min, and the composite pressure is 0.15-0.25 MPa.
CN202210946280.XA 2022-08-08 2022-08-08 Preparation method of aluminum-plastic composite film for improving aluminum leakage of molten adhesive Pending CN115257136A (en)

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