WO2007072604A1 - 樹脂被覆ステンレス鋼箔、容器及び2次電池 - Google Patents
樹脂被覆ステンレス鋼箔、容器及び2次電池 Download PDFInfo
- Publication number
- WO2007072604A1 WO2007072604A1 PCT/JP2006/315434 JP2006315434W WO2007072604A1 WO 2007072604 A1 WO2007072604 A1 WO 2007072604A1 JP 2006315434 W JP2006315434 W JP 2006315434W WO 2007072604 A1 WO2007072604 A1 WO 2007072604A1
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- WIPO (PCT)
- Prior art keywords
- resin
- stainless steel
- steel foil
- group
- layer
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
-
- 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
-
- 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
- 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
- B32B15/18—Layered products comprising a layer of metal comprising iron or steel
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/38—Chromatising
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/54—Electroplating of non-metallic surfaces
- C25D5/56—Electroplating of non-metallic surfaces of plastics
-
- 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
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/105—Pouches or flexible bags
-
- 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
- H01M50/117—Inorganic material
- H01M50/119—Metals
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- 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
- H01M50/121—Organic material
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- 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
- H01M50/126—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers
- H01M50/128—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers with two or more layers of only inorganic material
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- 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
- H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
- H01M50/133—Thickness
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- 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
- H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
- H01M50/145—Primary casings; Jackets or wrappings for protecting against damage caused by external factors for protecting against corrosion
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- 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
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- 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
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
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- 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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/24—Alkaline accumulators
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- 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
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- 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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
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- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
- Y10T428/264—Up to 3 mils
- Y10T428/265—1 mil or less
Definitions
- the present invention relates to a resin-coated stainless steel foil, a container, and a secondary battery excellent in corrosion resistance, workability, designability, and puncture resistance. .
- Electronic devices and electronic parts especially mobile phone, notebook personal computers, video cameras, satellites, electric hybrid vehicles, nickel-powered nickel batteries, nickel-hydrogen batteries, lithium-ion batteries, etc. Secondary batteries are widely used. Conventional secondary batteries that use strong alkaline electrolytes such as nickel-powered nickel and nickel-hydrogen
- the thinning of secondary battery containers is attracting attention as a tool that can increase the battery capacity by mounting more electrolyte ions in a limited volume.
- the strength of the container is reduced due to the thinning, there is a risk that the electrolyte may be leaked due to deformation or destruction when external force or piercing is applied. Electrolyte leaks are likely to cause serious damage to devices that contain secondary batteries. Therefore, the container member In the case of plastic or aluminum, the strength is insufficient when the thickness is 200 mm or less, and a material with high strength is required for further thinning. In view of mass production, it is preferable to use a material for “1”.
- Stainless steel copper foil is a material that satisfies these required characteristics.
- Stainless steel foil is made of stainless steel that is thinned to a thickness of 200 11 m or less, and the tensile strength and Vickers hardness of stainless steel are generally 2 to 10 times that of plastic and aluminum, and are therefore high in strength. It is promising as a thin material for secondary battery containers.
- the metal foil is inferior in corrosion resistance in the electrolyte, and the battery casing and
- a metal foil for example, Japanese Unexamined Patent Application Publication No. 2000-2000, in which an acid-modified polyolefin film having a corrosion-causing substance barrier property is laminated on a chrome-treated aluminum foil. No. 357494
- the mouth can be opened to the extent that it is corrosion-resistant, but if the thickness of the chromate treatment layer is inappropriate, sufficient adhesion of the film may not be exhibited. If it is thicker than necessary, there is a demerit of wasting use of a cloud that has a large environmental impact.
- the black plate processing layer is missing from the base material and the film peels off. There were problems such as.
- Stainless steel foil made of stainless steel drawn to a thickness of 200 m or less is attracting attention as a thin material with excellent mechanical strength.
- Home appliance parts such as a heat insulating bouch for refrigerators, hard disk drive arms, Mouth — Widely used as a material for office automation equipment parts such as debeams, flexures and covers, lead wires for secondary batteries and vouchers.
- the general problem with stainless steel copper foil is workability, which can be improved.
- a technique for optimizing the composition and heat treatment see, for example, JP-A-2004-52100 is known.
- the present invention has been made in view of such problems, and the object thereof is to maintain good adhesion with a strong film even in an electrolytic solution and to have good corrosion resistance. It is intended to provide a container using a stainless steel foil that has excellent properties, design properties, and puncture resistance, and a secondary battery using this container. Invention disclosure.
- the inventors of the present invention have examined the peeling state in an electrolytic solution of a stainless steel foil that has been subjected to a chromate treatment for coating a polyolefin resin composition containing a polar functional group such as an acid-modified porous film.
- a polar functional group such as an acid-modified porous film.
- the present invention was reached based on this finding. That is, the present invention is a governmental body having a polarity with a chrome treatment layer.
- the adhesion between the polyolefins containing functional groups' film and the quality of the treated layer itself are both correlated with the thickness of the treated layer.
- the present invention controls the chrome treatment layer to an appropriate range of thickness, preferably performs an appropriate base treatment such as nickel-slipping, and provides an appropriate resin composition film on one side. Or the stainless steel foil coated on both sides
- the gist of the present invention is as follows.
- At least one surface of the stainless steel foil has a cut-out treatment layer of 2 nm or more and 200 nm or less, and a polar functional group is formed on the chromate treatment layer.
- a resin-coated stainless steel foil characterized by having at least a polyolefin resin (A) layer contained therein.
- One surface of the stainless steel foil has a chromate treatment layer of 2 nm or more and 200 nm or less, and a polyolefin having a polar functional group on the chromate treatment layer.
- the chromate treatment layer has a thickness of 8 nm to 40 nm.
- the functional group having the polarity in the polyolefin resin (A) is an acid anhydride group, a hydroxyl group, a carboxyl group, an amide group, an amino group, a urethane group, an ester group, an imide group, (1) to 4 characterized in that it is at least one selected from a maleimide group, a chlorine group, an odor group, an ether group, a thiol group, an epoxy group, a nitrile group, and _S0 3-.
- the resin-coated stainless steel foil according to any one of 1).
- any one of (1) to (5) is characterized in that the content of the functional group having the polarity in the polyolefin resin (A) is 0.005 to 5 mmol / g.
- the longest diameter of the layered inorganic material (B) is 1 m or less.
- the resin-coated stainless steel copper foil according to (7) characterized by.
- the stainless steel copper foil has a thickness of 10 to 200 m, and the polyolefin resin (A) layer j has a thickness of 0.5 200 m.
- the resin layer on the other surface of the stainless steel foil is made of a resin composition mainly comprising one or more selected from the group consisting of polyolefin, polyester, polyamide, and polyimide.
- the polyester resin (E) in which the resin layer on the other surface of the stainless steel foil is finely dispersed in a rubber-like elastic resin (D) encapsulated with a vinyl polymer (C) containing a polar group The resin-coated stainless steel foil according to any one of (2) to (13), wherein the resin-coated stainless steel foil is at least one resin layer.
- the base treatment layer is provided between the resin layer on the other surface of the stainless steel copper foil and the stainless steel copper foil, (2) to (14), Resin coated stainless steel foil. .
- a stainless steel foil that maintains good adhesion to a strong film even in an electrolytic solution, has good corrosion resistance, and is excellent in workability, designability, and puncture resistance, is used.
- a container and a secondary battery using the container can be provided.
- FIG. 1 is a schematic cross-sectional view showing an example of the resin-coated stainless steel foil of the present invention.
- FIG. 2 is a schematic cross-sectional view showing a state in which a polyolefin-based resin layer layered inorganic substance in a resin-coated stainless steel foil is dispersed.
- Fig. 3 shows a schematic cross-sectional view of a resin layer made of a polyester resin in which a rubber-like elastic resin encapsulated with a vinyl polymer is differentiated.
- Figures 4 to 6 schematically show an example of a lithium secondary battery as a secondary battery using a container formed by molding a resin-coated stainless steel foil.
- Fig. 4 is a perspective view schematically showing the configuration of the lithium secondary battery
- Fig. 5 is a sectional view taken along the line AA in Fig. 4
- Fig. 6 is taken along the line B_B in Fig. 4. It is sectional drawing seen from the side. Best form for carrying out the invention ',
- a nickel strike plating layer 2 a mate treatment layer 3 and a polyolefin resin layer 4 are formed in order on one main surface of the stainless steel foil 1, and the other side of the stainless steel foil 1 is formed.
- a resin layer 6 is formed on the main surface of the substrate through an adhesive layer 5.
- the chromate treatment layer 3 and the polyolefin resin layer 4 are formed on one main surface of the stainless steel foil 1.
- Stainless steel 13 ⁇ 4 used in the present invention is austenitic (SUS 30 1,
- any of heat treatment and rolling can be performed freely. Is preferably 10 m and 200 m or less.
- chromium is applied to one or both surfaces of the stainless steel foil.
- a one-stop coating is provided.
- the chromate treatment film is formed by a conventionally known chromate treatment.
- the thickness of the force chromate film is 2 nm or more and 200 nm or less, preferably 5 nm or more and 60 nm or less, and more preferably 8 nm or more and 40 nm. Control to:
- chromate treatment is quantified by the mass of the treated film per unit area (mgZ m 2 etc.) and the amount of current applied during the electrolytic chromate treatment time (C Zdm 2 ). Not stipulated. In a typical continuous chrome treatment line, the entrance and exit of the stainless steel foil in the plating bath is sealed with a sealing member. Unstable chromate May cause non-uniform thickness of the coating. Therefore, instead of managing the chromate treatment layer based on the mass of the treated film per unit area (mgZrn 2 etc.) and the estimated energization amount during the treatment time (C / dm 2 ), the actual film thickness is used. It is necessary to manage the chromate processing layer.
- the film thickness is uniformly less than 2 nm, or non-uniform and partially less than 2 nm, or if there is a pinhole, the polyolefin film and the stainless copper foil in the electrolyte will adhere Insufficient force may cause peeling.
- the treated layer will crack when the stainless steel foil is processed, and the adhesion between the polyolefin film and the stainless steel foil in the electrolyte will be insufficient and will peel off. It may cause
- the chromate processing layer is thicker than necessary, it is a disadvantage to use a chromate that has a large environmental impact.
- the thickness of the film is determined by XPS analysis (X-ray photoelectron spectroscopy analysis).
- the depth from the surface layer until the Fe element is detected is defined as the thickness of the chromate-treated film. If there is a resin film on the surface, cut the surface diagonally with a sharp blade. The cross section is analyzed by XPS.
- the chromate treatment method include a method of applying an aqueous solution containing chromium oxide as a main component, an aqueous solution containing chromium oxide and phosphoric acid as main components, or a method of performing an electrochromic small treatment.
- a method of applying an aqueous solution mainly composed of chromium oxide and polyacrylic acid, heating and drying, etc. is not limited thereto.
- it is preferable to perform a base treatment on the surface to be subjected to the chromate treatment in particular, a strike plating treatment is more preferred, and a nickel strike plating treatment is more preferred.
- Examples of the strike plating process include nickel strike plating, gold strike plating, gold alloy strike plating, noradium strike plating, copper strike plating, and silver strike plating. It is not limited. Among these, nickel strike plating deposits nickel plating on the stainless steel surface while removing the oxide film on the surface of the stainless steel foil. 'As a result, there is no oxide film between the stainless steel and the nickel plating, resulting in a strong nickel plating. Nickel plating has strong adhesion to the chrome-plated layer, so that a strong chrome-treated layer can be formed on stainless steel or steel foil by applying a nickel-strike finish. is there. In direct chrome treatment on stainless steel foil, the film is unstable before the treatment liquid dries, and the film may easily peel off.
- an all-chloride nickel plating bath consisting of an aqueous solution mainly composed of nickel chloride and hydrochloric acid is used, and the cathode current density of ISAZdin 2 is 1 Examples include a method of energizing for 600 seconds, but are not limited thereto.
- the entire surface or part of the surface only needs to be nickel-plated, and the specific basis weight is not particularly specified force S, 0.1 ⁇ ! Plating with a thickness in the range of ⁇ 5 m is preferred.
- the polyolefin-based resin (A) containing a functional group having a polarity used in the present invention is a resin containing a resin having a repeating unit of the following (formula 1) as a main component and having a functional group having a polarity. It is. What is the main component?
- the resin having a repeating unit of (Formula 1) constitutes 50% by mass or more.
- R 1 and R 2 each independently represents an alkyl group having 1 to 12 carbon atoms or hydrogen, and R 3 represents an alkyl group having 1 to 12 carbon atoms, an aryl group or hydrogen
- the polyolefin used in the present invention may be a single polymer of these structural units or two or more types of copolymers. Repeat unit is
- 5 or more are preferably chemically bonded. If it is less than 5, high molecular effects (eg, flexibility, extensibility, etc.) are difficult to exert.
- repeating units examples include propene, 1-butene, 1-pentene, 4-methyl _ 1_pentene, 1 hexene, 1-octene.
- 1-decene, 1 Dodecene and other terminal units such as repeating units appearing when addition polymerization is performed, aliphatic units such as repeating units when isobutene is added, styrene monomer, o- Methyl Alkylated styrene such as styrene, m-methylstyrene, p-methylstyrene, o-ethylstyrene, m-ethylstyrene, o-ethylstyrene, o-t-butylstyrene, m-t-butylstyrene, p-t-butylstyrene And halogenated styrene such as monochlorostyrene, aromatic olefins such as styrene monomer addition polymer units such as terminal methylstyrene, and the like.
- Examples of such a repeating unit homopolymer include low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, cross-linked polyethylene, polypropylene, which are homopolymers of terminal polyolefins. Examples include polybutene, polypentene, polyhexene, polyoctenylene, polyisoprene, and polybutadiene. Examples of the copolymer of the above repeating unit include ethylene-propylene copolymer, ethylene-butene copolymer, ethylene-propylene-hexagene copolymer, ethylene-propylene-1-5-ethylidene-2_norbornene copolymer.
- Examples include aliphatic polyolefins such as polymers, and aromatic polyolefins such as styrene-based copolymers, but are not limited to these, as long as the above repeating units are satisfied. Good. Further, it may be a block copolymer or a random copolymer. These resins may be used alone or in combination of two or more.
- the most preferable from the viewpoint of handling properties and the barrier property of corrosion-causing substances is low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, cross-linked polyethylene, polypropylene, or a mixture of two or more of these. is there.
- the polyolefin used in the present invention only needs to have the above-mentioned olefin unit as a main component, and a vinyl monomer, a polar vinyl monomer, and a gen monomer, which are substitutes of the above units, are monomer units or It may be copolymerized in resin units.
- the copolymer composition is 50% by mass or less, preferably 30% by mass or less, based on the above olefin unit. If it exceeds 50% by mass, the properties of the olefin resin such as the barrier property against the causative substances will be deteriorated.
- Examples of the polar vinyl monomer include acrylic acid derivatives such as acrylic acid, methyl acrylate, and ethyl acrylate, and methacrylic acid, methyl methacrylate, and ethyl methacrylate. Examples thereof include methacrylic acid derivatives, acrylonitrile, maleic anhydride, imide derivatives of maleic anhydride, and vinyl chloride.
- the functional group contained is a chemical modifying group having a highly polar chemical structure that is covalently bonded to polyolefin.
- a functional group having polarity is a functional group in which elements having a difference in electronegativity of polling of 0.33 (eV) ° ' 5 or more are bonded.
- the functional group having no polarity is a hydrocarbon group. Examples of polar functional groups include acid anhydride groups, hydroxyl groups, carboxyl groups, amide groups, amino groups, urethane groups, ester groups, imide groups, maleimide groups, chlorine groups, bromine groups, And ether group, thiol group, epoxy group, nitrile group, -S0 3-, and the like.
- the site where the functional group is covalently bonded to the oligomeric oligomer may be the * end of one oligomer or in the middle of the molecular chain.
- acid anhydride groups, hydroxyl groups, carboxyl groups, amide groups, urethanes which are functional groups having hydrogen bonding properties and high polar interactions.
- Group, imide group, maleimide group, thiol group and the like are preferable, and among them, maleic anhydride group is particularly preferable.
- the content of the above functional group having polarity does not affect the physical properties of the polyolefin resin (A), and in order to have good adhesion to the stainless steel copper foil, 0.0005 0 1 g or more 5 It is preferably mmo l / g or less, more preferably 0.OO l mmo l Z g or more 1. Ommo l / g or less.
- the poly-resin-based resin (A) containing a functional group having polarity to be coated in the present invention may be a single layer or a multilayer.
- the upper layer of a polyolefin resin ( ⁇ ) containing a polar functional group may be coated with a resin such as polyolefin, polyester, polyamide, polyimide, etc. to form a plurality of layers.
- a resin such as polyolefin, polyester, polyamide, polyimide, etc.
- the surface layer of the surface not contacting the stainless steel foil of the polyolefin resin (A) with polarity and functional groups has polarity. It is preferable to coat a porphyrin which does not contain a functional group.
- the preferred range of the thickness of the forephin-based resin (coffin) layer coated in the present invention is 0.5 to 200 nm, and more preferably 15 to 100 m.
- the polyolefin resin ( ⁇ ) layer is covered with polyolefin.
- a polyolefin coated with a resin-coated stainless steel foil is preferably dispersed Fig. 2 schematically shows a state in which the layered inorganic substance (B) 1 1 is dispersed in the polyolefin resin layer 4.
- the layered inorganic substance (B) used in this preferred embodiment is a laminate of plate-like inorganic substances.
- the ratio of the long side to the thickness of the crystal layer is 10 to 10 1000 00, preferably ⁇ is 50 to 5000, more preferably 100 to 500.
- Inorganic crystals can be artificially combined with natural products. It may be made.
- clay minerals are widely exemplified. The clay mineral may be either ion exchangeable or nonion exchangeable, and the ion exchange may be either cation exchangeable, fanny exchangeable, or exchangeable.
- Caton-exchangeable layered clay minerals are smectite clay minerals, such as montmorillonite, noiderite, nontronite, polcon score ⁇ , saponite, iron sabonite ⁇ ⁇ , socolite, hexrite ⁇ An example of an anion-replaceable clay mineral that can be cited as a “Steven Lay” is an eight-site drastic site.
- examples of clay minerals that are not ion-exchangeable include mica, virginity Jite, chlorite, vermiculite, pyrophyllite, and bursaite.
- any plate-like inorganic crystal may be used, and the present invention is not limited thereto.
- the dispersion diameter of the layered material (B) contained in the resin composition of the present invention is not particularly specified, but the particle size of the layered inorganic material (B) is small, and the length of the long side and the thickness of the layered material is small. The larger the ratio, the larger the interface area with the resin phase. Therefore, even if a small amount of layered inorganic substance (B) is added, the effect of improving the rigidity and mechanical strength is increased. Specifically, it is preferable to disperse with a particle size of 1 m or less. If the particle size of the layered inorganic material (B) is more than 1 / im
- the dispersion diameter of the layered inorganic substance (B) is 200 nm or less, more preferably 200 nm or less, more preferably 50 nm or less, and most preferably, between the layers of the layered inorganic substance (B). It is preferable that the resin molecules are intensified and the layered inorganic substance (B) is dispersed in the resin phase as a particle diameter having a unit layer thickness.
- the aspect ratio of the long side to the thickness is 10 to 100000, preferably 50 to 5000, and more preferably 100 to 500.
- the resin composition in which the layered inorganic substance (B) is dispersed as described above is not dispersed. It was found that the peel resistance was improved compared to That is, when the resin-coated stainless steel foil coated with the resin composition is used, it is possible to improve the corrosion resistance necessary for the secondary battery container member and provide a secondary battery having a longer life.
- the layered inorganic substance (B) of the present invention may be dispersed in any part of the matrix phase or the dispersed phase, or the dispersion is unevenly distributed, even if dispersed throughout the resin composition. May be.
- the layered inorganic material (B) is uniformly dispersed in the matrix resin. In many cases, the continuous phase dominates the bulk mechanical properties. The layered inorganic compound is uniformly dispersed in the matrix phase. This is because the effect of improving rigidity and mechanical strength is easily exhibited.
- Examples of the method for confirming the dispersion diameter or dispersion state of the layered inorganic substance (B) include a method of directly observing with an electron microscope and a method of calculating the inter-surface distance from the peak of a specific crystal plane by wide-angle X-ray diffraction.
- wide-angle X-ray diffraction if resin molecules are intercalated between layers of layered inorganic material (B), the wa crystal plane peak shifts to the low-angle side or becomes a broad line. In-between—The power level can be determined and the state of dispersion can be predicted.
- the clue crystal peak disappears, it means that the interlayer force of the layered inorganic substance (B) by the resin molecules has progressed between the layers, and the layer has peeled, and the layered inorganic substance (B) has a unit.
- the resin with layer thickness Corresponds to a distributed structure.
- the layered inorganic substance (B) used in the present invention may be one kind or two or more kinds of clay minerals.
- the resin layer coated on the other surface of the stainless steel foil is not particularly limited, and various resin compositions such as thermoplastic resins, thermosetting resins, ultraviolet curable resins, electron beam curable resins can be applied. .
- a resin composition containing as a main component one or more selected from polyolefin, polyester, polyamide, and polyimide it is preferable to use a polyester-based resin (E) in which a rubber-like elastic resin (D) encapsulated with a polar polymer (C) is finely dispersed.
- Stainless steel foil can be obtained by coating the other surface with a resin composition mainly composed of one or more selected from polyolefin, polyester, polyamide, polyimide, and polyester resin (E).
- a resin composition mainly composed of one or more selected from polyolefin, polyester, polyamide, polyimide, and polyester resin (E).
- processability, designability, and the like can be imparted to the substrate, and in addition, insulation can be imparted.
- the resin layer may be a single layer or multiple layers, and the total thickness is preferably in the range of 0.5 to 200 m, more preferably in the range of 15 to 100 m. If it is less than 0.5 m, the functions such as processability, design, and insulation may not be sufficiently imparted, and if it exceeds 200 m, the processability may deteriorate. There is a risk of becoming inappropriate as a member, and economic benefits are also difficult to express.
- the polyolefin used in the present invention is a resin whose main component is a resin having a repeating unit as shown in the above (formula 1).
- the polyester used in the present invention is a hydroxycarboxylic acid compound.
- Thermoplastic polyester consisting only of physical residues, thermoplastic polyesters consisting of di- and carboxylic acid residues and diol compound residues, or hydroxycarboxylic acid compound residues It is a thermoplastic polyester comprising a sulfonic acid residue and a divalent compound residue as constituent units. A mixture of these may also be used.
- -Carboxyphenyl examples include propane, and these may be used alone or in combination of two or more.
- dicarboxylic acid compounds that form sulfonic acid residues include terephthalic acid, isofuric acid, orthophthalic acid, 1,4-naphthalenedicarboxylic acid, 2,3-naphthalenedicarboxylic acid Acid, 2, 6
- Aromatic dicarboxylic acids such as anoic acid and adipic acid, pimelic acid, Sebashi
- U Aliphatic dicarboxylic acids such as nogoic acid and citrate, and alicyclic dicarboxylic acids such as cyclohexane dicarponic acid, etc., which can be used alone or in combination of two or more. May be used.
- bisphenol ⁇ 2-bis (4-hydroxyphenyl) propane
- Trimethylcyclohexane 1, 1 mono-bis (4-hydroxyphenyl), 1-phenyl phenyl, bis- (4-hydroxyphenyl) phenylmethane, 2, 2-bis- (4-dioxyphenyl) propane
- Aromatic diols such as nyl, 4-, 4-hydroxybenzophenone
- ethylene glycol ⁇ U methylene glycol, propylene glycol Recall, Tetramethylene U-Col, 1,4-Butanediol, Pentamethylene U 3-l, Neopentyl Glycol, Hexamethylene Glycol, Decamemethylene U-Cole, Diethylene Glycol, Triethylene G Ucol, Te Aliphatic diols such as traethylene glycol, polyethylene glycol, hydrogenated bisphenol A, and alicyclic diols such as hexane diol, etc. It is also possible to use a mixture of two or more. Also from these ⁇
- Protected polyester resin may be used alone or in combination of two or more.
- the polyester used in the present invention may be composed of these compounds or a combination thereof, and among them, it is an aromatic polyester resin composed of an aromatic dicarboxylic acid residue and a diol residue. It is preferable from the viewpoint of sex and thermal stability.
- the hostel used in the present invention is trimesic acid, pyrome
- dicarboxylic acid compounds and diol compounds are terephthalic acid 50 to 95 mol%, isophthalic acid and / or orthophthalic acid 50 to 5 mo. 1
- polyesters used in the present invention include polyethylene terephthalate, polybutylene terephthalate, polytetraethylene terephthalate, and polymorphic terephthalate.
- Xylene dimethylene terephthalate polyethylene 1 26 6 6-Naphtalate, among others, polyethylene terephthalate with moderate mechanical properties, gas barrier properties, and metal adhesion, polybutylene terephthalate, polyethylene 1,2, 6-naphtha Rate, polybutylene—2, 6 _ naphtho rate is most preferred.
- the polyester used in the present invention has a glass transition temperature (Tg, sample amount of about 10 mg, measured with a differential thermal analyzer (DSC) with a heating rate of 10 ° CZ) Force Normal 50 to 120 ° C, preferably 60 ⁇ 100 ° C is desirable.
- This polyester may be amorphous or crystalline, and in the case of being crystalline, the crystal melting temperature (Tm) force is usually 210 to 265 ° C, preferably 210 to 245, Low temperature crystallization temperature (Tc) is usually 110 to 220, preferably 120 to 215. If Tm is 210 ° C or if Tc is less than 110, the film shape may not be maintained during drawing because of insufficient heat resistance. Also, if Tm exceeds 265 ° C or Tc exceeds 220, the resin may not enter the surface irregularities of the stainless steel foil, resulting in poor adhesion.
- Polyamide used in the present invention includes, for example, Nylon 6, Nylon 66, Nylon 69, Nylon 46, Nylon 610, Nylon 12, polymer xylene azide and each of these components. Examples thereof include a copolymerized product and a blended product.
- the polyimide used in the present invention refers to all polyhead resins.
- Polyimide, polyamidoimide, polyester imide, polysiloxane imidazolide, polybenzimidazole, and the like are resins made of a polymer having an imide group in the structure.
- a polyester-based resin (E) in which a rubbery elastic resin (D) encapsulated with a vinyl polymer (C) having a polar group is finely dispersed (E ) has three components: vinyl polymer, rubber-like elastic resin, and polyester resin It is a resin composition.
- Fig. 3 schematically shows such a resin composition.
- the rubber-like elastic resin (D) 13 encapsulated with a vinyl polymer (C) 12 having a polar group in the polyester resin 6 is fine. Distributed.
- the vinyl polymer (C) containing a polar group is 1% by mass of a unit having a group in which elements having an electronegativity difference in polling of 0.33 ⁇ (eV) ° 5 or more are bonded.
- the unit having a polar group is less than 1% by mass, sufficient adhesion to the stainless steel foil is obtained even when the rubber-like elastic resin (D) is encapsulated with a vinyl polymer (C) containing a polar group. Not expression.
- groups in which elements having a difference in electronegativity of Pungs of 0.33 (eV) ° ⁇ 5 or more are combined include: hydroxyl group, carbonyl group, carbonyloxyl, Acid anhydride group, dicarbonyl imide group (-(C
- units having a polar group examples include vinyl alcohol as an example having a hydroxyl group, vinyl chloromethyl ketone as an example having a carbonyl group, acrylic acid, methanolic acid as an example having a carboxy group, Vinyl acids such as vinyl acetate and vinyl propionate and their metal salts or ester derivatives.
- Examples of those having an epoxy group include glycidyl acrylate, glycidyl methacrylate, and glycyl ethacrylate.
- ⁇ -unsaturated glycidyl esters such as glycidyl acrylate, examples having an acid anhydride group, examples of maleic anhydride having an anhydride group and dipolyimide group Imide derivatives
- An example having a CN group is acrylonitrile, an example having an amino group is an acrylamine, an example having an amino group is an acrylamide
- vinyl chloride as an example with _S0 3 — group Styrenesulfonic acid, etc. may be mentioned, and these may be contained alone or in plural in the vinyl polymer (C).
- the unit having a polar group contained in the vinyl polymer (C) may be a unit having a group in which elements having a difference in electronegativity of polling of 0.33 (eV) ° 5 or more are bonded. It is not limited to the above specific example.
- the vinyl polymer (C) containing a polar group used in the present invention As an example of the vinyl polymer (C) containing a polar group used in the present invention, the above polar group-containing unit alone or two or more kinds of polymers, and the polar group-containing unit and And a copolymer with a nonpolar vinyl monomer represented by the general formula (Formula 2).
- each RR 5 independently represents an alkyl group having 1 to 12 carbon atoms or hydrogen
- R 6 represents an alkyl group having 1 to 12 carbon atoms, a phenyl group, or hydrogen.
- nonpolar vinyl monomer of formula (2) examples include ethylene, propylene, 1-butene, 1-pentene, 4_methyl- 1-pentene, 1-hexene, 1-octene. , 1-decene, 1-decene, ⁇ -olefin, isobutene, isobutylene, and other aliphatic vinyl monomers, styrene monomer, ⁇ -methylstyrene, m-methylstyrene, ⁇ -methylstyrene, o-ethyl styrene, m-ethyl styrene, ⁇ -ethyl styrene, alkylated styrene such as t-butyl styrene, and aromatic vinyl monomers such as styrene-based monoaddition polymer units such as ⁇ -methyl styrene.
- Examples of the homopolymer of a polar group-containing unit include polyvinyl alcohol, polymethyl methacrylate, vinyl acetate, and the like.
- examples of the nocles of polar group-containing units and nonpolar vinyl monomers include ethylene-methacrylic acid copolymers, ethylene-acrylic acid copolymers, ethylene-vinyl acetate copolymers, and these.
- the vinyl polymer (C) containing a polar group used in the present invention may be a vinyl polymer containing 1% by mass or more of a unit having a polar group, and is limited to the above specific examples. Further, the molecular weight of the vinyl polymer (C) containing a polar group is not particularly limited, but the number average molecular weight is preferably 2000 or more and 500,000 or less. If it is less than 2000 or more than 500000, the rubber-like elastic resin (D) may not be fully encapsulated.
- the rubber-like elastic resin (D) used in the present invention known rubber-like elastic resins can be widely used.
- Tg glass transition temperature
- DSC differential thermal analyzer
- Young's modulus power at room temperature OOOMPa
- a rubber-like elastic resin having an elongation at break of 50% or more is preferred. Sufficient workability cannot be achieved when the Tg of the rubber elastic part is more than 50, the Young's modulus at room temperature is more than OOOMPa, and the breaking elongation is less than 50%.
- Tg is preferably 10 or less, more preferably -30 ° C or less.
- Young's modulus at room temperature is l OOMPa or less, more desirably l OMPa or less.
- the elongation at break is preferably 100% or more, more preferably 300% or more.
- the rubber-like elastic resin (D) used in the present invention include polyolefin resin, butadiene-styrene copolymer (SBR), acrylonitrile monobutadiene copolymer (NBR), and polyisoprene.
- SBR butadiene-styrene copolymer
- NBR acrylonitrile monobutadiene copolymer
- SBS Geno-elastostyrene-butadiene-styrene copolymer
- S EBS hydrogenated product
- HI PS rubber modified styrene
- Silicone elastomers such as acrylonitrile monostyrene monobutadiene copolymer (ABS), etc. Examples thereof include polyester elastomers such as polyester-polyether copolymers.
- polyolefin resin is preferred because of its low water vapor permeability.
- the most preferred resins for imparting processing strength as the polyolefin resin are ethylene-propylene polymer, ethylene-one 1-butene copolymer, ethylene-1 -pentene-it polymer, ethylene. 1 3 1-Ethylpentene Copolymer, Ethylene 1
- -Copolymer of ethylene such as octene polymer and monoolefin having 3 or more carbon atoms. More specifically, the above binary copolymer is modified with buvenous soprene 5 —methylidene 1 2 norbornene, 5 — ethylitene — 2- Norbonneno, Jingkou Pengen, 1,4, 1-hexane, etc. * A terpolymer composed of copolymerized ethylene, ⁇ -carbon containing 3 or more carbon atoms, and non-conjugated jean.
- a non-conjugated gen 5 —methylidene 2 —norbornene, 5 —ethylidene 2 —norponene, di
- the polyester-based resin (E) used in the present invention has a rubbery elastic resin (D) dispersed with a vinyl polymer (C) containing a polar group in the matrix of the above polyester. It is a resin composition.
- the resin composition for coating a metal plate of the present invention comprises a polyester having an intrinsic viscosity of 0.5-2. OdlZ g., A rubber-like elastic resin (D), and a vinyl polymer (C) containing a polar group,
- the rubber-like elastic resin (D) is finely dispersed in the polyester matrix, and at least a part of the rubber-like elastic resin (D) is encapsulated with the vinyl polymer (C). It is preferable.
- the fine dispersion is a state where the rubber-like elastic resin (D) is dispersed in the polyester matrix with an average dispersion diameter of OO ⁇ m or less.
- the average dispersion diameter is preferably 1 m or less, and more preferably ⁇ 0.5 m or less. If it exceeds 1 m, sufficient workability may not be exhibited.
- the dispersion of rubber elastic body (D) is measured by the following method. Cut the sheet cross section in any direction, identify and observe the rubber-like elastic body (D) phase and the other phases by a method that can be distinguished from each other, and measure the dispersion diameter. Specifically, after staining with a solvent that stains only the rubber-like elastic body (D) phase, it is observed with a transmission electron microscope (TEM), and the dispersion diameter of the rubber-like elastic body (D) phase is measured.
- the number of rubber-like elastic bodies (D) phases to be observed during measurement is not specified, but 20 or more are preferable from the statistical significance, and more preferably 30 or more phases are extracted and discriminated. Is desirable.
- the rubber-like elastic resin (D) encapsulated with the vinyl polymer (C) is 80% or more, preferably 95% or more of the rubber-like elastic resin (D) interface. ), And the direct contact area between poly, ester and rubbery elastic resin (D) is less than 20%. With such a structure, even if the rubber-like elastic resin (D) is in contact with the metal plate, the vinyl polymer (C) has adhesiveness to the metal plate. Adhesion can be secured. It is not necessary that the rubber-like elastic resin (D) is entirely encapsulated with the vinyl polymer (C), and at least 70% by volume of the rubber-like elastic resin (D) is the vinyl polymer. It is sufficient if it is encapsulated with (C).
- the unencapsulated rubber-like elastic resin (D) is present in a volume ratio of more than 30%, the rubber-like elastic resin (D that directly contacts the metal plate when the resin composition is coated on the metal plate) ) Ratio increases, and adhesion between the resin composition and the metal plate cannot be secured.
- the average dispersion diameter of the non-encapsulated rubber-like elastic resin (D) is not particularly specified, but is preferably 0.5 m or less from the viewpoint of processability.
- an excessive amount of vinyl polymer (C) force rubber-like elastic resin (D) may be dispersed alone in the polyester matrix without encapsulating.
- the amount and diameter of the vinyl polymer (C) that is not encapsulated is not particularly limited, but is preferably 20% or less by volume ratio of the total vinyl polymer (C) and 0.5 zm or less by average dispersion diameter. . If the volume ratio exceeds 20%, basic properties such as heat resistance of the resin composition may change. On the other hand, if the average dispersion diameter is more than 0.5 m, the workability may decrease.
- the resin composition for coating a stainless steel foil used in the present invention is not particularly limited as long as it has the above-described structure, but the rubber is used for 100 parts by mass of the polyester resin (E).
- Elastic resin (D) 1-50 parts by weight
- the vinyl polymer (C) is 1-50 parts by weight, and further contains 0.001-7 parts by weight of an antioxidant for 100 parts by weight of the resin composition.
- a resin composition is preferred. Rubber-like elastic resin. If (D) is less than 1 part by mass, sufficient processability may not be imparted, and if it exceeds 50 parts by mass, heat resistance may be reduced. If the vinyl polymer (C) is less than 1 part by mass, the rubber-like elastic resin (D) may not be fully encapsulated, and if it exceeds 50 parts by mass, the heat resistance may be reduced.
- the intrinsic viscosity of the polyester resin (E) used in the present invention is 0.5 to 2.0 dlZ g, preferably 0.65 to 1.7 dlZ g, and more preferably 0.8 to 1.5 d 1 / g.
- the intrinsic viscosity is less than 0.5 dlZ g, the rubber-like elastic resin (D) and the polar monomer-containing vinyl polymer (C) are not homogeneously mixed, resulting in low mechanical strength and processability. 2. If it exceeds OdlZ g, the moldability will be poor and neither is desirable.
- Intrinsic viscosity ⁇ I n (t / to) ⁇ / C ( ⁇ )
- Polyester resins ( ⁇ ) in which a rubber-like elastic resin (D) encapsulated with a vinyl polymer (C) having a polar group is finely dispersed are conventionally used as polyolefins, polyesters, polyamides, polyimides, etc. In comparison, the adhesion to the stainless steel copper foil is good, and even when the coated foil is added, cracking and peeling do not occur and it has good workability.
- the rubber-like elastic resin (D) can be finely dispersed by encapsulating the rubber-like elastic resin (D) with a vinyl polymer (C) containing a polar group. This is because.
- the matrix The reester can be softened moderately, and cracks and propagation of cracks can be suppressed to achieve a dramatic improvement in workability.
- the laminating film can be kept almost defect-free and can be processed strongly into laminating metal materials.
- the polyester resin (E) has a fine dispersion of polar vinyl-containing resin (C), which is unexpectedly well-suited to printing ink and has excellent printability. Realizing designability for stainless steel copper foil for secondary battery containers, where it is difficult to provide designability originally Resin composition covering not only polyester resin (E) but also stainless steel foil
- the printed surface of the object is preferably subjected to a square treatment.
- the various resin compositions used in the present invention may be heat stabilizers, light stabilizers, mold release agents, lubricants.
- the surface thickness of the stainless steel foil on the side coated with the poly-olefin resin (A) is 2 nm to 200 nm, preferably 5 nm to 60 nm. More preferably, a chromate treatment layer controlled to be 8 nm or more and 40 nm or less is provided, but it is preferable that the surface on the side coated with the other resin is also subjected to a ground treatment. By applying the ground treatment, the chemical adhesion between the resin composition and the stainless steel foil can be increased. Specifically, the method of removing the oil and scale on the surface of the stainless steel foil as necessary, followed by a chemical conversion treatment method is listed as the base treatment. Examples of the scale removal treatment method include pickling, sandblasting, and so on. Processing, grid plast processing, etc.
- Examples of chemical conversion treatment methods are: ⁇ mate treatment, non-chromate treatment without using Cr + 6 , striking treatment, epoxy primer treatment
- an adhesive layer on the stainless steel foil surface is used.
- a resin composition is preferably laminated thereon.
- Adhesive layer has known adhesion
- the agent can be widely used.
- the specific resin system is determined according to the surface properties of the stainless steel is and the component system of the resin composition to be coated, but the polar group is a carboxyl group, a carboxyl group metal, an acid anhydride group.
- Polyolefin resins containing one or more of amide groups, amino groups, epoxy groups, and alcohol groups can be suitably used as adhesives.
- a specific example of the method of laminating the adhesive layer and the resin film of the present invention in this order on the surface of the stainless steel foil is as follows. Adhesive resin or polyolefin of the present invention is formed on the lower layer by a method such as two-layer extrusion.
- the former is preferable from the viewpoint of production efficiency, such as the method of laminating.
- the adhesive layer resin is plasticized to express a sufficient anchor effect, or the chemical interaction between steel Z adhesives is enhanced. Therefore, it is preferable to heat the stainless steel foil to the melting point of the adhesive resin or higher.
- the form of the coating resin composition of the present invention is not limited as long as it is coated in a layer form when coated on a stainless steel foil, and in particular, a force that does not define the thickness or shape before coating.
- the thickness of the layer is preferably from 0.5 am to 200 m.
- known methods can be used for coating various resin compositions on stainless steel foil. Specifically, (1) A method in which a resin composition is melt-kneaded with an extruder equipped with a T-die to form a film, and after being extruded, it is thermocompression bonded to a stainless steel foil. (2) Extrusion in advance Or a method in which a molded sheet or film (in this case, it may be stretched in the direction of 1 axis or 2 axes) is bonded by thermocompression, or using an adhesive, etc.
- the method for forming the stainless steel copper foil into a container shape is not particularly limited, and conventional methods such as pressing, drawing and drawing can be used.
- the shape of the container is not particularly limited, such as a rectangular parallelepiped rectangular tube shape, a cylindrical shape, or the like.
- stainless steel foils squeezed by pressing or the like may be bonded together, or only one side may be squeezed.
- a method of sealing it is possible to use a conventional bonding method, specifically, a method of bonding using an adhesive, and a heat bonding method.
- a heat seal is preferable from the viewpoint of productivity.
- the sheet sealer ⁇ is coated with a polyolefin resin ( ⁇ ). It is preferable to match the surfaces to be bonded.
- a battery element such as a positive electrode, a negative electrode, a separator, etc., and a battery content part such as an electrolyte solution are accommodated in the container described above to form a secondary battery.
- the shape of the battery element is not limited, but the battery element that has been wound, flattened and thinned This is preferable.
- the type of the secondary battery is not particularly limited, and examples thereof include a lithium ion battery, a lithium polymer battery, a nickel metal hydride battery, and a nickel cadmium battery.
- FIG. 4 is a perspective view schematically showing the configuration of a lithium secondary battery
- 'Fig. 5 is a cross-sectional view taken along line AA in Fig. 4
- Fig. 6 is taken along line B-B in Fig. 4.
- the battery casing material 2 1 is a cross-sectional view seen from the side of the stainless steel foil according to the present invention, which has been pressed into a concave shape so that the battery contents can be inserted, and a flat one, such as welding or heat sealing.
- 2 2 is the terminal part of the positive electrode
- 2 3 is the terminal part of the negative electrode.
- the positive electrode 2 4 and the negative electrode 2 5 are wound through the separator 2 6, that is, the positive electrode 2 4 / separate overnight 2 6 and the negative electrode 2 5 / separator 2 6 6 are stacked.
- ⁇ There is a battery element 2 8 that is flattened and impregnated with electrolyte 2 7.
- the electrolyte solution 2 7 may be filled in the battery.
- stainless steel foil is applied to secondary battery container applications compared to Al-foam foil, which has been used as a metal foil for secondary battery containers in the past, for corrosion resistance, workability, and design.
- a suitable base treatment as in the present invention, printing on a film having good adhesion with stainless steel foil and good workability, and covering it with an expectation
- resin-coated stainless steel foil that has all of the corrosion resistance, workability, and design required for modern secondary battery container components.
- the coated polyolefin resin does not peel even when immersed in the electrolyte for a long period of time, and the corrosion resistance is significantly improved compared to conventional metal foils for secondary battery containers. is doing. In addition, it can be processed into a free shape and has a good design. In addition, it has been used as a metal foil for secondary battery containers. Compared to lumi foil, etc., it has overwhelming strength, so it has excellent puncture resistance.
- the resin-coated stainless steel box which can be used even in harsher environments than before, has a long service life, and has both productivity and aesthetics, is not available in conventional technology. It is possible to provide a secondary battery.
- the stainless steel foil used in this example was SUS316L BRITE A manufactured by Nippon Steel Corporation having a thickness of 50 m.
- Nickel strike plating in Examples 9 to 16 and Comparative Examples 2 to 4 was performed as follows. Pickling with 30 mol% sulfuric acid aqueous solution, pickling with 15 mol% hydrochloric acid aqueous solution, nickels, trike bath, nickel chloride 240 g L, hydrochloric acid (specific gravity 1.18) 125 mLZL, S AZdni 2 cathode current density for 5 seconds Energized. All were processed at room temperature.
- Chromate treatment consists of 25 g / L of chromic anhydride, 3 g ZL of sulfuric acid, 4 g ZL of nitric acid. Use a bath at room temperature with appropriate addition of phosphoric acid, hydrochloric acid, ammonium fluoride, etc., and cathode current density 25AZ dm 2 formed a chromate treatment layer.
- the processing time was lengthened when the amount of chromate processing was increased, and the processing time was shortened when it was decreased. Specifically, it was energized for 360 seconds to make the treatment layer 200 nm, 20 seconds to make 15 nm, and 1 second to make it 1.4 nm.
- the film thickness is not proportional to the energization time, and the film thickness cannot be controlled by the energization amount or the estimated reaction amount, XPS analysis (Quantum2000 model made by PHI, X-ray source is ⁇ (1486.7 eV) monochromatic, X-ray output 15kV 1.6mA), the thickness of the chromate treatment layer was directly measured and controlled.
- the chromate treatment was performed only on one side, and when nickel strike plating was applied, the chromate treatment was performed as the upper layer of the nickel strike plating treatment.
- Table 1 shows the resin composition coated on the stainless steel foil.
- Resin (1) in Table 1 is 86.9% by mass, vinyl polymer (C) containing polar groups (High Milan 1706, made by Mitsui DuPont) is 3% by mass, rubber-like elastic resin (D ) (JSR EBM2041P) 10% by mass, Tetrakis [methylene (3,5-di-tert-butyl-1-hydroxy-hydroxydrocinnamate)] 0.1 mass as the antioxidant %, Using a V-type renderer, this mixture was melt-kneaded at 260 using a twin-screw kneading extruder TEX made by Nippon Steel Works to obtain a resin composition pellet. It was.
- the ultrathin section was cut out from the resin composition of resin (11) with a microtome, it was dyed with ruthenium acid, and the dispersed state of rubber-like elastic resin (D) and vinyl polymer (C) in resin (11) was analyzed with a transmission electron microscope (TEM).
- TEM transmission electron microscope
- the separable flask was filled with xylene, and the resin (3) in Table 1 and maleic anhydride were driven at a mass ratio of 99.98: 0.02. Special reagents were used for xylene and maleic anhydride. After stirring at room temperature for 30 minutes, the temperature was raised to 120 ° C. Next, several drops of Kayoxa AD50C manufactured by Kayaku Akuzo dissolved in xylene was added dropwise, and the mixture was further stirred for 4 hours. The solution was cooled to 100, poured into acetone, stirred, and then filtered and dried to obtain a resin. In addition, The resin was sufficiently extracted with acetone to remove unreacted maleic anhydride. This was designated as resin (5) in Table 1. In addition, resins prepared in the same procedure with resin (3) and maleic anhydride charge mass ratios of 80:20, 30:70, respectively, were prepared using the resins (6) and (7) in Table 1, respectively. It was.
- Resin (4) in Table 1 is 99.995, 95.45% by mass, and layered inorganic material (B) is Montmorillonite (Housyun Co., Ltd. sven NX) is 0.005, 5, 55% by mass, respectively.
- B layered inorganic material
- sven NX Montmorillonite
- the mixture was melt-kneaded using a twin-screw kneading extruder TEX manufactured by Nippon Steel Works Co., Ltd. to obtain a resin composition pellet (kneading time: 6 minutes, kneading temperature: 245 ° C, average shear rate: 50 / s). These were designated as resins (9), (10), and ( ⁇ ) in Table 1, respectively.
- the layered inorganic substance (B) was finely dispersed on the nanoscale in the range of 50 to 300 nm.
- Resin (1), (2), (11) in Table 1 is 280 ° C, otherwise it is 250 ° C, and the shape of the film (width 300mm, thickness 25m) using an extruder equipped with a T-die. ) was not stretched.
- Iunitsu Unitech Co., Ltd.'s Unilon G-100 # 25 was used as the biaxially stretched polyamide film.
- the resin (3) and (4) were extruded at 250 ° C, and a co-extrusion machine equipped with a T-die was used to form a two-layer film (width 300 mm, resin (3) layer 15 mm.
- the resin (4) layer lO ⁇ m) was non-stretched.
- films (1) to (13) were used. Table 2 Resin used for each film
- the film of Table 2 it was thermocompression bonded to stainless steel foil at 200 ° C and lOkgZcm 2 in the combination of Table 3 (for convenience, the polyolefin resin (A) of the present invention was coated in the table)
- the side surface is referred to as the surface).
- the polyolefin resin (A) side front side
- the other side resin for example, the polyester resin (E)
- the film (12) was thermocompression bonded, it was thermocompression bonded so that the resin (4) was in close contact with the stainless steel foil.
- Comparative Examples 1 to 5 were prepared with the combinations shown in Table 3.
- the aluminum foil of Comparative Example 5 was a pure A1 foil with a thickness of lf) 0 ⁇ m.
- the resin-coated stainless steel foil produced above was subjected to various tests shown below.
- the resin-coated metal foils of Examples 1 to 16 and Comparative Examples 1 to 5 were cut into lOmmX 120 miii, and the adhesion strength of the coated resin layer on the surface side was peeled (23 °, 180 ° peel: same as JIS K6854-2 Measured with type and tensile strength 20mmZinin). It preferably has an adhesion strength of 10 N cm or more.
- the resin-coated metal foils of Examples 1 to 16 and Comparative Examples 1 to 5 were drawn into a rectangular tube shape that is often used as a battery case.
- the pressing of the rectangular tube was performed under the following conditions. Die 142 mm x 142 mm, corner diameter 4 min, punch 140 DIDIX 140 mm, corner diameter 4 mm, wrinkle presser force 9 tons, use a mixture of Johnson WAX122 and machine oil 1: 1, press speed 60 mm / min
- a blank with a size of 200 minX200 mm was pressed to a depth of 5 mm with the front side facing the punch. '
- the appearance of the resin-coated metal foil after press working was evaluated as follows, and the workability was evaluated. Cracks and peeling at the interface between the coating resin and the coating resin and the metal foil in the entire bent part of the rectangular tube drawing process were observed at a 20-fold level.
- the processability evaluation results were as follows. ⁇ : No crack or peeling is observed, ⁇ : No crack is observed, ⁇ : Fine crack is observed, X: Crack is observed. Here, an evaluation of 0 or more was accepted.
- the electrolyte was diluted to a concentration of 1 mo 1 / L with a solvent in which hexafluorophosphoric acid.lithium (LiPF 6 ) was mixed with ethylene carbonate and jetyl carbonate in a 1: 1 ratio. I used something.
- the puncture strength was measured as follows. Fix the resin-coated metal foil, apply a load with a needle with a length of 50 ⁇ , a diameter of 0.5mm, a tip radius of 0.15mni perpendicular to the surface side, and pierce the maximum load until the needle penetrates. It was.
- the strength required for the battery case is preferably 1200 g or more, more preferably 2000 g or more. ,
- Table 4 shows the evaluation results.
- the adhesion strength after immersion in the electrolyte solution maintained a good adhesion strength of about 25% at the maximum, the rate of decrease from the primary adhesion strength, and no corrosion occurred and was good. Processability was demonstrated.
- Examples 2 and 6 8 are compared, Examples 2. and 7 in which the content of the functional group having a polarity is in the range of 0. OOlmmol / g or more and 3. Ommo 1 g or less have strong adhesion. It is more preferable to exhibit.
- the polyester resin (E) of the resin layer on the other surface is more preferable because it has excellent printability because it has excellent printability.
- the processability is particularly good by coating the polyester resin (E) rather than the stainless steel foil and the die in direct contact, so that the workability is particularly good. Is possible.
- the three steps of degreasing, lubricant application, and lubricant removal before and after can be omitted, and mold wear that could not be sufficiently prevented even with the use of a lubricant can be suppressed, and the mold life can be extended. Therefore, it is more preferable.
- Example 15 since the adhesion of the polyolefin resin (A) is particularly excellent and hardly deteriorates even after immersion in the electrolyte, it is possible to produce a long-lasting battery case container. This is preferable because it is possible.
- Example 9 16 the nickel-strike treatment is applied, so that the chrome-treated layer can be stably coated, and the stable connection of stainless steel copper foil that has useful properties as a battery case. i is preferable because it can be manufactured.
- Comparative Example 12 the thickness of the polyolefin-based resin (A) containing a functional group having a polarity after immersion in the field solution solution with a chromium treatment layer thickness of 2 nm or less. The adhesion was completely insufficient and corrosion occurred.
- Comparative Example 3 the thickness of the ⁇ mate treatment layer is
- the adhesion of the polyolefin resin (A) which is 200 nm or more and contains a polar functional group after immersion in the electrolyte is insufficient, and corrosion occurs.
- peeling and cracking were observed at the interface between the coated film and the stainless steel foil. These are because the chrome-treated layer cracked at the bent part in the rectangular tube drawing process, and the chrome-treated layer was defective.
- PP containing no polar functional group was used. When used, the thermocompression bonding did not adhere to the stainless steel foil at all.
- Comparative Example 5 when Almi foil was used instead of stainless steel copper foil, the piercing strength was significantly insufficient compared to stainless steel copper foil.
- Example 1 16 shows that the stainless steel copper foil of the present invention is more resistant to corrosion, workability, design, and puncture resistance than conventional metal foils for secondary battery containers. We were able to confirm that it was excellent.
- the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but it goes without saying that the present invention is not limited to such examples. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the claims, which naturally belong to the technical scope of the present invention. It is understood. ⁇ ⁇ 'Industrial Applicability
- the present invention is applicable to a resin-coated stainless steel foil, a container, and a secondary battery excellent in corrosion resistance, workability, designability, and puncture resistance.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Engineering & Computer Science (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Chemical Treatment Of Metals (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2634108A CA2634108C (en) | 2005-12-20 | 2006-07-28 | Resin-coated stainless steel foil, container and secondary battery |
CN2006800476971A CN101331020B (zh) | 2005-12-20 | 2006-07-28 | 树脂被覆不锈钢箔、容器及二次电池 |
EP06782294.0A EP1964667B1 (en) | 2005-12-20 | 2006-07-28 | Resin-coated stainless steel foil, container and secondary battery |
US12/086,830 US9719185B2 (en) | 2005-12-20 | 2006-07-28 | Resin-coated stainless steel foil, container and secondary battery |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005-366763 | 2005-12-20 | ||
JP2005366763A JP5080738B2 (ja) | 2005-12-20 | 2005-12-20 | 樹脂被覆ステンレス鋼箔,容器及び2次電池 |
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WO2007072604A1 true WO2007072604A1 (ja) | 2007-06-28 |
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PCT/JP2006/315434 WO2007072604A1 (ja) | 2005-12-20 | 2006-07-28 | 樹脂被覆ステンレス鋼箔、容器及び2次電池 |
Country Status (8)
Country | Link |
---|---|
US (1) | US9719185B2 (ja) |
EP (1) | EP1964667B1 (ja) |
JP (1) | JP5080738B2 (ja) |
KR (1) | KR101024790B1 (ja) |
CN (1) | CN101331020B (ja) |
CA (1) | CA2634108C (ja) |
TW (1) | TWI403014B (ja) |
WO (1) | WO2007072604A1 (ja) |
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KR20170031698A (ko) | 2014-07-22 | 2017-03-21 | 신닛테츠스미킹 마테리알즈 가부시키가이샤 | 축전 디바이스 용기용 강박, 축전 디바이스용 용기 및 축전 디바이스, 및 축전 디바이스 용기용 강박의 제조 방법 |
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JP2017079199A (ja) * | 2015-10-22 | 2017-04-27 | 大日本印刷株式会社 | 電池用包装材料 |
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JP7413264B2 (ja) | 2018-08-31 | 2024-01-15 | 東洋鋼鈑株式会社 | 電池容器用金属板およびこの電池容器用金属板の製造方法 |
Also Published As
Publication number | Publication date |
---|---|
CN101331020B (zh) | 2012-09-12 |
US9719185B2 (en) | 2017-08-01 |
EP1964667A4 (en) | 2011-08-24 |
CA2634108A1 (en) | 2007-06-28 |
TW200731604A (en) | 2007-08-16 |
KR20080084978A (ko) | 2008-09-22 |
KR101024790B1 (ko) | 2011-03-24 |
TWI403014B (zh) | 2013-07-21 |
CN101331020A (zh) | 2008-12-24 |
US20090029245A1 (en) | 2009-01-29 |
EP1964667A1 (en) | 2008-09-03 |
JP2007168184A (ja) | 2007-07-05 |
EP1964667B1 (en) | 2014-04-30 |
CA2634108C (en) | 2013-11-19 |
JP5080738B2 (ja) | 2012-11-21 |
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