WO2015045887A1 - 蓄電デバイス用外装材 - Google Patents
蓄電デバイス用外装材 Download PDFInfo
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- WO2015045887A1 WO2015045887A1 PCT/JP2014/074105 JP2014074105W WO2015045887A1 WO 2015045887 A1 WO2015045887 A1 WO 2015045887A1 JP 2014074105 W JP2014074105 W JP 2014074105W WO 2015045887 A1 WO2015045887 A1 WO 2015045887A1
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- layer
- base material
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- electricity storage
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Definitions
- the present invention relates to an exterior material for an electricity storage device.
- This application claims priority based on Japanese Patent Application No. 2013-197043 filed in Japan on September 24, 2013, the contents of which are incorporated herein by reference.
- a power storage device used for mobile terminal devices such as mobile phones and laptop computers, video cameras, satellites, electric vehicles, etc.
- lithium ion batteries that are ultra-thin and miniaturized are known.
- contents such as a positive electrode material, a negative electrode material, a separator, and an electrolyte solution are packaged by molding an electricity storage device exterior material (hereinafter simply referred to as “exterior material”) into a predetermined shape.
- an electricity storage device exterior material hereinafter simply referred to as “exterior material”
- the exterior body conventionally, a metal can-type exterior body obtained by press-molding a metal plate or the like has been used.
- a laminate film having a metal foil such as an aluminum foil has high flexibility in shape and is easy to reduce in weight.
- Laminate film type exterior bodies obtained by cold molding a layered structure such as a layer are widely used.
- An electricity storage device using a laminate film as an exterior material is formed by deep-drawing the laminate film by cold molding to form a recess, containing the contents for the device in the recess, and heat sealing the peripheral portion by heat sealing. Manufactured by.
- the electricity storage device As the depth of the concave portion is increased, the storage amount of contents is increased and the energy density is increased. Therefore, for the base material layer of the exterior material, a polyamide film having excellent moldability that does not easily generate cracks or pinholes even when the depth of the concave portion is increased is suitably used (for example, Patent Documents 1 and 2). ). However, polyamide films do not have sufficient electrolyte resistance.
- the base material layer is dissolved by the electrolytic solution, and the metal foil layer inside the exterior material may be corroded.
- the polyamide film does not have sufficient scratch resistance, and the surface of the base material layer may be scratched during handling, resulting in a decrease in designability, durability, and the like.
- Patent Document 1 shows that a mat varnish layer is formed on the outer surface of the base material layer for the purpose of further improving the moldability of the exterior material.
- the mat varnish layer is formed of cellulose-based, vinyl chloride-vinyl acetate-based, modified polyolefin-based, rubber-based, acrylic-based, urethane-based olefin-based or alkyd-based synthetic resins, and silica-based or kaolin-based matting agents.
- the mat varnish layer is provided, it is difficult to sufficiently suppress deterioration of the base material layer due to the electrolytic solution and to provide sufficient scratch resistance.
- a packaging material for a lithium ion battery As a packaging material for a lithium ion battery, a packaging material using nylon as a base material layer has been used in many cases. However, in order to impart electrolyte resistance and design properties to the base material layer, Providing a base material protective layer has also been proposed.
- the following problems remain in the exterior material having the configuration in which the base material protective layer is provided.
- a barcode or the like may be printed on the surface of the exterior material by inkjet printing for the purpose of lot tracing or the like. If there is a printing mistake, the ink is removed using alcohol or the like and then reprinted on the surface of the exterior material.
- the base material protective layer does not have resistance to alcohol, and the base material protective layer may be peeled off together with the ink.
- the electrolytic solution may be wiped off using alcohol. Also in this case, the base material protective layer may be peeled off and the electrolyte resistance may be lost.
- the packaging material cannot be reused, and there is a problem in that the production efficiency of the electricity storage device is reduced.
- an object of the present invention is to provide an exterior material for an electricity storage device that can be suitably reused even after wiping with an alcohol or the like, while increasing the resistance of the electrolytic solution by the base material protective layer.
- An exterior material for an electricity storage device has a first surface and a second surface, and at least a first adhesive layer, a metal foil layer, a corrosion prevention treatment layer, a second surface on the first surface.
- the proportion of the burette body and the isocyanurate body may be 10 mass percent or more with respect to the total mass of the curing agent. In the exterior material for an electricity storage device of one embodiment of the present invention, the proportion of the burette body may be 10 mass percent or more and 40 mass percent or less with respect to the total mass of the curing agent.
- the curing agent may be composed of only one material of the burette body and the isocyanurate body. In the exterior device for an electricity storage device of one embodiment of the present invention, the curing agent may be composed of only materials of both the burette body and the isocyanurate body.
- the isocyanate may be 1,6-hexamethylene diisocyanate.
- the base material protective layer may contain a filler.
- the first adhesive layer may contain a filler.
- the exterior material for an electricity storage device of one embodiment of the present invention it is possible to provide an exterior material for an electricity storage device that can be suitably reused even after wiping with alcohol or the like while increasing resistance to the electrolyte solution by the base material protective layer. .
- (meth) acrylic acid means acrylic acid or methacrylic acid.
- (meth) means acrylic acid or methacrylic acid.
- the materials in which “(meth)” is shown are interpreted in the same manner as described above.
- an exterior material 1 for an electricity storage device of the present embodiment (hereinafter simply referred to as “exterior material 1”) has a first adhesive layer 12, a metal foil on a first surface of a base material layer 11.
- the layer 13, the corrosion prevention treatment layer 14, the second adhesive layer 15, and the sealant layer 16 are sequentially laminated, and the substrate protective layer 17 is laminated on the second surface of the substrate layer 11.
- the exterior material 1 is used as an exterior material for an electricity storage device, the exterior material 1 is used so that the sealant layer 16 is located in the innermost layer so that the base material protective layer 17 is located in the outermost layer.
- the exterior material 1 is an exterior material in which a base material protective layer 17 is laminated on the outside (position close to the second surface) of the base material layer 11.
- the base material protective layer 17 is a layer laminated on the outer surface (second surface) of the base material layer 11, and is a group consisting of a polyester polyol and an acrylic polyol having a hydroxyl group (functional group) in the side chain. And a curing agent containing at least one of an isocyanate burette body and an isocyanurate body (hereinafter sometimes referred to collectively as “polyol”).
- polyester polyol (a1) is a polyester polyol having a hydroxyl group in the side chain in addition to the hydroxyl group at the end of the repeating unit. is there.
- polyester polyol (a1) include polyester polyols obtained by reacting one or more dibasic acids with one or more compounds having three or more hydroxyl groups. The unreacted portion of the hydroxyl groups of the compound having three or more hydroxyl groups becomes the hydroxyl group of the side chain of the polyester polyol (a1).
- dibasic acid examples include aliphatic dibasic acids such as succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, and brassic acid; isophthalic acid, terephthalic acid, naphthalenedicarboxylic acid, etc. And aromatic dibasic acids.
- aliphatic dibasic acids such as succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, and brassic acid
- isophthalic acid terephthalic acid, naphthalenedicarboxylic acid, etc.
- aromatic dibasic acids examples include hexanetriol, trimethylolpropane, pentaerythritol and the like.
- the polyester polyol (a1) may be a compound obtained by reacting a diol as necessary in addition to the compound having three or more dibasic acids and hydroxyl groups.
- the diol include aliphatic diols such as ethylene glycol, propylene glycol, butanediol, neopentyl glycol, methylpentanediol, hexanediol, heptanediol, octanediol, nonanediol, decanediol, and dodecanediol; cyclohexanediol, Examples thereof include alicyclic diols such as hydrogenated xylylene glycol; aromatic diols such as xylylene glycol.
- polyester urethane polyol which made the chain extension by making the hydroxyl group of the both ends of the said polyester polyol react with 1 or more types of the isocyanate compound more than bifunctional.
- the bifunctional or higher functional isocyanate compound include 2,4- or 2,6-tolylene diisocyanate, xylylene diisocyanate, 4,4′-diphenylmethane diisocyanate, methylene diisocyanate, isopropylene diisocyanate, lysine diisocyanate, 2,2, 4- or 2,4,4-trimethylhexamethylene diisocyanate, 1,6-hexamethylene diisocyanate, methylcyclohexane diisocyanate, isophorone diisocyanate, 4,4′-dicyclohexylmethane diisocyanate, isopropylidene dicyclohexyl-4,4′-diisocyanate, etc. Can be mentioned. Moreover, Moreover, Moreover
- the acrylic polyol having a hydroxyl group in the side chain (hereinafter referred to as “acryl polyol (a2)”) is an acrylic polyol having a hydroxyl group in the side chain in addition to the hydroxyl group at the end of the repeating unit.
- the acrylic polyol (a2) include a copolymer having as a main component a repeating unit derived from (meth) acrylic acid, obtained by copolymerizing at least a hydroxyl group-containing acrylic monomer and (meth) acrylic acid. It is done.
- the hydroxyl group-containing acrylic monomer include 2-hydroxyethyl (meth) acrylate and 2-hydroxypropyl (meth) acrylate.
- alkyl (meth) acrylate monomers include methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl) Group, i-butyl group, t-butyl group, 2-ethylhexyl group, cyclohexyl group, etc.); (meth) acrylamide, N-alkyl (meth) acrylamide, N, N-dialkyl (meth) acrylamide (alkyl) Examples of the group include methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, t-butyl group, 2-ethylhexyl group, cyclohexyl group and the like.
- acrylic polyol (a2) is preferable because it is superior in resistance to the electrolytic solution.
- a polyol can be used according to the function and performance calculated
- the isocyanate used as the curing agent may be either an aliphatic isocyanate or an aromatic isocyanate, but is preferably an aliphatic isocyanate.
- the aliphatic isocyanate curing agent is a bifunctional or higher functional isocyanate compound having no aromatic ring. Since it does not have an aromatic ring, quinoid formation of the benzene ring due to ultraviolet rays does not occur, and yellowing can be suppressed. Therefore, it is suitable for the outermost layer.
- Aliphatic isocyanate curing agents include methylene diisocyanate, isopropylene diisocyanate, lysine diisocyanate, 2,2,4- or 2,4,4-trimethylhexamethylene diisocyanate, 1,6-hexamethylene diisocyanate, methylcyclohexane diisocyanate, isophorone Examples thereof include diisocyanate, 4,4′-dicyclohexylmethane diisocyanate, and isopropylidene dicyclohexyl-4,4′-diisocyanate.
- the crosslinking density of the base material protective layer 17 to be formed is improved, and the alcohol wiping resistance is improved.
- the base material protective layer 17 suppresses the base material layer 11 from being deteriorated by the electrolytic solution, and is difficult to peel off by wiping with alcohol, so that the outer packaging material can be suitably reused even after wiping.
- an isocyanate burette body is used, the crosslinking density of the resin constituting the base material protective layer is further improved, and therefore, an isocyanate burette body is preferably included.
- the ratio of the isocyanate compound burette body or isocyanurate body is 10 mass percent (wt%) or more with respect to the total mass of the curing agent, the above-described effects are exhibited. The higher the ratio, the greater the effect described above. For this reason, in order to improve the electrolyte solution resistance and alcohol wiping resistance of the base material protective layer 17, the curing agent is composed of only one of the burette body and the isocyanurate body, or the burette body and Most preferably, the curing agent is composed of only the isocyanurate body.
- the proportion of the burette body in the curing agent is 10% by mass or more and 40% by mass or less. If the proportion of the burette body is 10% by mass or more, the effect of improving the electrolytic solution resistance and alcohol wiping resistance improvement by the burette body is large. If the proportion of the burette body is 40% by mass or less, good moldability is obtained. Can hold.
- 1,6-hexamethylene diisocyanate and isophorone diisocyanate are preferable because the resistance to electrolytic solution is improved.
- the reactivity between the aliphatic isocyanate curing agent and the hydroxyl group of the polyol is 1,6-in comparison with the reactivity between isophorone diisocyanate and the hydroxyl group of the polyol.
- the reactivity between hexamethylene diisocyanate and the hydroxyl group of the polyol is high. Therefore, in view of suitability for mass production, 1,6-hexamethylene diisocyanate is particularly preferable.
- the molar ratio (NCO / OH) of the hydroxyl group of the main polyol and the isocyanate group of the curing agent isocyanate is preferably 0.5 to 50, and more preferably 1 to 20.
- the molar ratio (NCO / OH) is not less than the lower limit (0.5), scratch resistance and electrolyte resistance are improved.
- the molar ratio (NCO / OH) is not more than the upper limit (50), it is easy to ensure adhesion between the base material protective layer and the base material.
- the thickness of the base material protective layer 17 is preferably 1 to 10 ⁇ m, and more preferably 1 to 5 ⁇ m. When the thickness of the base material protective layer 17 is not less than the lower limit (1 ⁇ m), excellent electrolytic solution resistance is easily obtained. When the thickness of the base material protective layer 17 is not more than the upper limit (10 ⁇ m), it is easy to make the base material thin and it is easy to obtain stretching performance.
- the outer surface of the base material protective layer 17 is preferably subjected to a mat treatment. Thereby, the slipperiness of the surface of the base material protective layer 17 is improved, and it becomes easy to suppress the exterior material 1 from being excessively adhered to the mold in the cold molding, so that the moldability is improved. Also, a frosting effect can be obtained.
- a filler may be mixed in the base material protective layer.
- fine particles of inorganic materials such as silica, acrylic, alumina, barium sulfate, calcium carbonate, titanium oxide, acrylic beads, and the like can be used.
- silica fine particles are preferable because resin cracking (whitening due to fine cracks) hardly occurs during press molding of the exterior material. If the average particle size of the filler is smaller than 0.2 ⁇ m, sufficient lubricity may not be obtained. If the average particle size is larger than 3 ⁇ m, the base material protective layer may become brittle. Is preferably 0.2 ⁇ m or more and less than 3 ⁇ m.
- the content ratio of the filler in the base material protective layer 17 (the content ratio of the filler with respect to the mass of the base material protective layer 17) is desirably 5% by mass or more and 50% by mass or less.
- the content ratio of the filler is desirably 5% by mass or more and 50% by mass or less.
- the average particle size in the embodiment of the present invention is defined as the particle size measured by the Coulter counter method.
- the Coulter counter method is one of measuring methods for particle size and particle size distribution. Specifically, a partition wall having one small hole is provided in the electrolytic solution, electrodes are arranged on both sides of the partition wall, and when a voltage is applied to the electrode, a current flows, and the electric resistance obtained thereby decreases the partition wall size. Determined by the volume of the hole.
- a filler is dispersed in an electrolyte solution to prepare a thin suspension, and when the suspension is sucked from one wall of the partition arranged in the suspension, Particles pass through the small holes of the partition walls from the other wall toward one wall.
- the electrolyte is reduced from the electrolyte solution by the total volume of the particles that have passed through the small holes, and the electrical resistance of the electrolyte solution is increased. Therefore, the amount of change in electrical resistance measured in this way indicates the particle volume, and the number of occurrences of change in electrical resistance indicates the particle. Thereby, a particle size distribution is obtained.
- the base material protective layer 17 may contain additives such as a flame retardant, a lubricant (slip agent), an antiblocking agent, an antioxidant, a light stabilizer, and a tackifier.
- additives such as a flame retardant, a lubricant (slip agent), an antiblocking agent, an antioxidant, a light stabilizer, and a tackifier.
- the lubricant include fatty acid amides such as oleic acid amide, erucic acid amide, stearic acid amide, behenic acid amide, ethylene bisoleic acid amide, and ethylene biserucic acid amide.
- As the anti-blocking agent various filler-based anti-blocking agents such as silica are preferable.
- one type may be used alone, or two or more types may be used in combination.
- a slip agent layer may be formed on the base material protective layer.
- the slip agent layer is formed by roll coating or spraying using a solution obtained by diluting a fatty acid amide in a solvent such as isopropyl alcohol, ethyl acetate, toluene, methyl ethyl ketone, or the like to 0.1 to 10%. Can do. A sufficient effect can be obtained if the amount of fatty acid amide to be coated or sprayed is 0.1 mg or more per square meter. Moreover, the contamination of the metal mold
- the base material layer 11 provides heat resistance in a sealing process when manufacturing the electricity storage device, and plays a role of suppressing the generation of pinholes that can occur during molding and distribution. In particular, in the case of an exterior material for a large-sized lithium ion battery, scratch resistance, chemical resistance, insulation, and the like can be imparted.
- the base material layer 11 is preferably a resin film formed of an insulating resin. Examples of the resin film include stretched or unstretched films such as polyester films, polyamide films, and polypropylene films.
- the base material layer 11 may be a single layer film composed of the above resin film, or may be a laminated film using two or more kinds of the above resin films.
- a polyamide film is preferable because of excellent moldability among the materials described above. Examples of the polyamide resin forming the polyamide film include nylon 6, nylon 11, nylon 12, nylon 66, nylon 610, nylon 612, and the like.
- the thickness of the base material layer 11 is preferably 6 to 40 ⁇ m, and more preferably 10 to 30 ⁇ m.
- the thickness of the base material layer 11 is the lower limit (6 ⁇ m) or more, pinhole resistance and insulation are improved.
- the thickness of the base material layer 11 is not more than the upper limit (40 ⁇ m), the moldability is improved.
- the first adhesive layer 12 is formed between the base material layer 11 and the metal foil layer 13.
- the first adhesive layer 12 not only has an adhesive force necessary to firmly bond the base material layer 11 and the metal foil layer 13 but also the metal foil layer 13 by the base material layer 11 when cold forming.
- followability for protecting the material from being broken performance for reliably forming the first adhesive layer 12 on the member without peeling even if the member is deformed / stretched) is also required.
- a two-component curing type polyurethane adhesive using a polyol such as polyester polyol, polyether polyol, acrylic polyol or the like as a main agent and using an aromatic or aliphatic isocyanate as a curing agent, etc. Is mentioned.
- the molar ratio (NCO / OH) of the isocyanate group of the curing agent to the hydroxyl group in the main agent is preferably 1 to 10, and more preferably 2 to 5.
- the thickness of the first adhesive layer 12 is preferably 1 to 10 ⁇ m and more preferably 2 to 6 ⁇ m in order to obtain desired adhesive strength, followability, workability, and the like.
- a filler such as an inorganic substance or a pigment
- the pigment may be an organic or inorganic pigment, or a mixture of these pigments.
- the filler may be an organic filler or an inorganic filler, or a mixture thereof.
- the elastic modulus of the first adhesive layer 12 By adjusting the elastic modulus of the first adhesive layer 12 by containing one or more selected from the group consisting of pigments and fillers, high temperature resistance, humidity resistance, electrolyte solution resistance, etc. after deep drawing or stretching of the exterior material Reliability can be increased.
- the base material layer 11 and the first adhesive layer 12 are also required to have a function of suppressing breakage of the metal foil layer 13 when the exterior material is stretched.
- the first adhesive layer 12 in the embodiment of the present invention achieves excellent followability and elastic modulus close to that of the metal foil layer 13 in addition to high adhesion to the base material layer 11 and the metal foil layer 13 respectively. The reliability after deep drawing and stretching of the exterior material is increased.
- the type of the pigment is not particularly limited when it is in a range that does not impair the adhesiveness of the first adhesive layer 12.
- organic pigments include azo, phthalocyanine, quinacridone, anthraquinone, dioxazine, indigothioindigo, perinone-perylene, and isoindolenin
- inorganic pigments include carbon black.
- the pigment it is preferable to use a pigment having a functional group that binds to the isocyanate group of the curing agent, from the viewpoint of adhesion to the urethane resin formed of the polyol and the curing agent in the first adhesive layer 12.
- the functional group include a hydroxyl group.
- organic pigments for example, the following pigments can be used.
- Yellow isoindolinone, isoindoline, quinophthalone, anthraquinone (flavatron), azomethine, xanthene and the like.
- Orange diketopyrrolopyrrole, perylene, anthraquinone, perinone, quinacridone, etc.
- Red Anthraquinone, quinacridone, diketopyrrolopyrrole, perylene, indigoid and the like.
- the inorganic pigment for example, the following pigments can be used.
- White zinc white, lead white, lithopone, titanium dioxide, precipitated barium sulfate, barite powder, etc.
- Red Lead red, iron oxide red, etc.
- Yellow yellow lead, zinc yellow (Zinc Yellow 1 type, Zinc Yellow 2 type) and the like.
- Blue Ultramarine blue, prussian blue (potassium ferrocyanide), etc.
- Black Carbon black or the like.
- the filler examples include resin fillers such as polyethylene, polypropylene, phenol resin, and acrylic resin, silica, graphite, and the like.
- the shape of the filler examples include flakes, true spheres, hollows, fibers, and irregular shapes. Since the filler with a high elastic modulus contributes to the improvement of reliability, it is preferable to use an inorganic filler.
- the pigment and filler contained in the first adhesive layer 12 may be one type or two or more types.
- the ratio of the total amount of the pigment and filler in the first adhesive layer 12 (100% by mass) is 1% by mass or more and preferably 5% by mass or more because higher reliability is obtained. Moreover, since the outstanding adhesiveness is acquired, content of the said coloring component is 50 mass% or less, and 20 mass% or less is preferable.
- Metal foil layer 13 As the metal foil layer 13, various metal foils such as aluminum and stainless steel can be used, and aluminum foil is preferable from the viewpoint of workability such as moisture resistance and spreadability and cost.
- the aluminum foil for example, a known soft aluminum foil can be used, and an aluminum foil containing iron is preferable in order to obtain desired pinhole resistance and extensibility during molding.
- the iron content in the aluminum foil (100% by mass) is preferably 0.1 to 9.0% by mass, and more preferably 0.5 to 2.0% by mass. When the iron content is the lower limit (0.1% by mass) or more, pinhole resistance and spreadability are improved. When the iron content is not more than the upper limit (9.0% by mass), flexibility is improved.
- the soft aluminum foil which gave the annealing process is further more preferable.
- the thickness of the metal foil layer 13 is preferably 9 to 200 ⁇ m and more preferably 15 to 150 ⁇ m in order to obtain desired barrier properties, pinhole resistance, and workability.
- a particularly preferred metal foil layer 13 is an annealed soft aluminum foil having a thickness of 15 to 150 ⁇ m.
- 8021 material and 8079 material are preferable according to JIS standards.
- the aluminum foil used for the metal foil layer 13 is preferably subjected to a degreasing treatment in order to obtain desired electrolytic solution resistance.
- a degreasing treatment In order to simplify the manufacturing process, an aluminum foil whose surface is not etched is preferable.
- the degreasing treatment is roughly classified into a wet type degreasing treatment and a dry type degreasing treatment, and a dry type degreasing treatment is preferable in order to simplify the manufacturing process.
- Examples of the dry type degreasing treatment include a method of performing a degreasing treatment by increasing the treatment time in the step of annealing the aluminum foil. In the annealing treatment performed to soften the aluminum foil, sufficient electrolytic solution resistance can be obtained even with a degreasing treatment performed simultaneously.
- degreasing treatment frame treatment, corona treatment, and the like can be given. Furthermore, a degreasing process in which contaminants are oxidatively decomposed and removed by active oxygen generated by irradiation with ultraviolet rays having a specific wavelength may be employed.
- Examples of the wet type degreasing treatment include acid degreasing and alkali degreasing.
- the acid used for acid degreasing include inorganic acids such as sulfuric acid, nitric acid, hydrochloric acid, and hydrofluoric acid. Said acid may be used individually by 1 type, and may use 2 or more types together.
- As an alkali used for alkali degreasing sodium hydroxide etc. with a high etching effect are mentioned, for example.
- blended is mentioned.
- the wet type degreasing treatment is performed by a dipping method or a spray method.
- the corrosion prevention treatment layer 14 serves to firmly adhere the metal foil layer 13 and the second adhesive layer 15 and to protect the metal foil layer 13 from the electrolytic solution and hydrofluoric acid generated from the electrolytic solution.
- the corrosion prevention treatment layer 14 can be formed by, for example, a hydrothermal alteration treatment, an anodizing treatment, a chemical conversion treatment, or a combination of these treatments.
- Examples of the hydrothermal modification treatment include boehmite treatment obtained by immersing aluminum foil in boiling water to which triethanolamine is added.
- Examples of the anodizing treatment include alumite treatment.
- Examples of chemical conversion treatment include chromate treatment, zirconium treatment, titanium treatment, vanadium treatment, molybdenum treatment, calcium phosphate treatment, strontium hydroxide treatment, cerium treatment, ruthenium treatment, or a mixed phase containing materials used in these treatments.
- Examples of various chemical conversion treatments are not limited to the wet type, and a method in which a treatment agent containing a material used in these treatments and a resin component are mixed and the mixed material is applied to the metal foil layer 13 by this is also applicable.
- the coating chromate treatment is preferable from the viewpoint of waste liquid treatment while maximizing the effect obtained by the corrosion prevention treatment.
- the corrosion prevention treatment layer 14 can be formed only by a pure coating technique.
- a sol of a rare earth element-based oxide such as cerium oxide having an average particle diameter of 100 nm or less is used as a material that has an aluminum corrosion prevention effect (inhibitor effect) and is also suitable from an environmental viewpoint.
- the method using is mentioned.
- the second adhesive layer 15 is a layer that bonds the corrosion prevention treatment layer 14 and the sealant layer 16 together.
- the exterior material 1 is roughly classified into two types, that is, a thermal laminate configuration and a dry laminate configuration, depending on the type of the second adhesive layer 15.
- a dry laminate configuration the same adhesive as that mentioned in the first adhesive layer 12 can be used as a component for forming the second adhesive layer 15.
- dimer fatty acid is an acid obtained by dimerizing various unsaturated fatty acids, and examples of the structure of the dimer fatty acid include acyclic, monocyclic, polycyclic, and aromatic ring types.
- the polybasic acid which is a raw material of the polyester polyol used as an adhesive for forming the second adhesive layer 15 is not particularly limited.
- the fatty acid which is a starting material of a dimer fatty acid is not specifically limited.
- the component that forms the second adhesive layer 15 is preferably an acid-modified polyolefin resin obtained by graft-modifying a polyolefin resin with an acid.
- the polyolefin resin include low density, medium density, and high density polyethylene; ethylene- ⁇ olefin copolymer; homo, block, or random polypropylene; propylene- ⁇ olefin copolymer.
- the said polyolefin resin may be used individually by 1 type, and may use 2 or more types together.
- the acid to be graft-modified include carboxylic acid, epoxy compound, acid anhydride and the like, and maleic anhydride is preferable.
- a polyolefin resin is graft-modified with maleic anhydride to make it easy to maintain the adhesion between the sealant layer 16 and the metal foil layer 13 even when the electrolytic solution penetrates.
- maleic anhydride-modified polyolefin resin is preferable, and maleic anhydride-modified polypropylene is particularly preferable.
- the adhesive resin is easily oriented in the MD direction (machine direction) due to stress or the like generated during extrusion molding.
- an elastomer may be blended in the second adhesive layer 15 in order to relax the anisotropy of the second adhesive layer 15.
- the elastomer compounded in the second adhesive layer 15 include olefin elastomers and styrene elastomers.
- the average particle diameter of the elastomer to be blended is preferably 200 nm or less in order to improve the compatibility between the elastomer and the adhesive resin and to improve the effect of relaxing the anisotropy of the second adhesive layer 15.
- the said average particle diameter is measured by taking the photograph which expanded the cross section of the elastomer composition with an electron microscope, and measuring the average particle diameter of the disperse
- the above-mentioned elastomers may be used alone or in combination of two or more.
- the amount of the elastomer in the second adhesive layer 15 (100% by mass) is preferably 1 to 25% by mass, and more preferably 10 to 20% by mass.
- the blending amount of the elastomer is not less than the lower limit (1% by mass)
- the compatibility with the adhesive resin is improved, and the effect of relaxing the anisotropy of the second adhesive layer 15 is improved.
- the blending amount of the elastomer is not more than the upper limit value (25% by mass), it is easy to suppress the second adhesive layer 15 from swelling with the electrolytic solution.
- the second adhesive layer 15 may be formed using a dispersion type adhesive resin liquid in which the adhesive resin is dispersed in an organic solvent.
- the thickness of the second adhesive layer 15 is preferably 1 to 40 ⁇ m, and more preferably 5 to 20 ⁇ m.
- the sealant layer 16 is an inner layer of the exterior material 1 and is a layer that is thermally welded when the battery is assembled. That is, the sealant layer 16 is a layer composed of a heat-weldable film.
- the film component constituting the sealant layer 16 include polyolefin resins and acid-modified polyolefin resins obtained by graft-modifying polyolefin resins with maleic anhydride or the like.
- polyolefin resin is preferable and polypropylene is especially preferable.
- polypropylene examples include the polypropylene exemplified in the second adhesive layer 15.
- the sealant layer 16 may be formed of a film in which the various resins described above are mixed.
- the sealant layer 16 may be a single layer film or a multilayer film.
- the sealant layer 16 When using a film formed by extrusion molding, the sealant layer 16 tends to be oriented in the extrusion direction of the film. Therefore, in order to reduce the anisotropy of the sealant layer 16 due to the orientation, an elastomer is added to the sealant layer 16. You may mix
- the same materials as the materials mentioned as the elastomer compounded in the second adhesive layer 15 can be used, and preferable materials are also the same.
- the sealant layer 16 is a laminated film
- the elastomer may be blended only in any one of a plurality of layers constituting the laminated film, or may be blended in all layers.
- the sealant layer 16 is composed of three layers of random polypropylene / block polypropylene / random polypropylene
- the elastomer may be blended only in the block polypropylene layer or only in the random polypropylene layer. It may be blended in both the random polypropylene layer and the block polypropylene layer.
- a lubricant may be added to the sealant layer 16 for the purpose of imparting slipperiness to the sealant layer 16.
- the blending amount of the lubricant in the sealant layer 16 (100% by mass) is preferably 0.001% by mass to 0.5% by mass.
- the blending amount of the lubricant is 0.001% by mass or more, it is easy to obtain an effect of suppressing the whitening of the sealant layer 16 during cold molding.
- the blending amount of the lubricant is 0.5% by mass or less, it is easy to suppress a decrease in adhesion strength due to bleeding of the lubricant from the sealant layer to the laminate surface (laminate surface) of the other layer of the exterior material 1. .
- the manufacturing method of the exterior material 1 is demonstrated.
- the manufacturing method of the exterior material 1 is not limited to the method described below.
- Examples of the method for producing the packaging material 1 include a method having the following steps (I) to (IV).
- (I) A step of forming a corrosion prevention treatment layer 14 on the metal foil layer 13.
- (II) A step of bonding the base material layer 11 to the surface of the metal foil layer 13 opposite to the surface on which the corrosion prevention treatment layer 14 is formed via the first adhesive layer 12.
- III A step of bonding the sealant layer 16 to the corrosion prevention treatment layer 14 of the metal foil layer 13 via the second adhesive layer 15.
- (IV) A step of laminating the base material protective layer 17 on the base material layer 11.
- the corrosion prevention treatment agent include a corrosion prevention treatment agent for coating type chromate treatment.
- the method for applying the corrosion inhibitor is not particularly limited, and examples thereof include gravure coating, gravure reverse coating, roll coating, reverse roll coating, die coating, bar coating, kiss coating, and comma coating.
- the metal foil layer 13 may be an untreated metal foil or a metal foil that has been degreased by a wet-type degreasing process or a dry-type degreasing process.
- an aging treatment may be performed in the range of room temperature to 100 ° C. to promote adhesion.
- the above-mentioned adhesive is used, and the sealant layer 16 is bonded to the corrosion prevention treatment layer 14 of the laminate by a technique such as dry lamination, non-solvent lamination, wet lamination.
- a thermal laminate configuration for example, the following dry process and wet process are exemplified.
- an adhesive resin is extruded and laminated on the corrosion prevention treatment layer 14 of the laminate to form the second adhesive layer 15.
- a film for forming the sealant layer 16 is laminated on the second adhesive layer 15.
- the film for forming the sealant layer 16 is obtained by an inflation method or a casting method.
- heat treatment aging treatment, thermal lamination, etc.
- a second film is formed by laminating the second adhesive layer 15 and the sealant layer 16 by an inflation method or a casting method, and laminating the multilayer film on the laminate by thermal lamination.
- the sealant layer 16 may be laminated via the layer 15.
- a dispersion type adhesive resin solution of an adhesive resin such as an acid-modified polyolefin resin is applied on the corrosion prevention treatment layer 14 of the laminate, and the solvent is volatilized at a temperature equal to or higher than the melting point of the adhesive resin. Then, the adhesive resin is melted and softened and baked to form the second adhesive layer 15. Thereafter, the sealant layer 16 is laminated on the second adhesive layer 15 by a heat treatment such as thermal lamination.
- a urethane resin dispersion type coating liquid for forming the base material protective layer 17 is prepared. Examples of the method include coating by various coating methods such as dipping and spraying, heating, volatilizing the solvent, and baking.
- the base material protective layer 17 can also be formed by extrusion molding or the like in which the urethane resin is melted and extruded. Further, the outer surface of the base material protective layer 17 may be subjected to processing such as mat processing.
- the exterior material 1 of this embodiment is obtained.
- the manufacturing method of the packaging material 1 is not limited to the method of sequentially performing the steps (I) to (IV).
- step (I) may be performed after performing step (II).
- process (II) after performing process (IV).
- the formation of the corrosion prevention treatment layer 14 and the extrusion lamination for laminating the sealant layer 16 on the second adhesive layer 15 may be continuously performed in-line.
- the base material protective layer 17 is formed of a polyol main ingredient and a curing agent containing at least one of an isocyanate burette body and an isocyanurate body.
- Film A-1 Nylon 6 film with a thickness of 25 ⁇ m.
- Adhesive B-1 polyurethane adhesive (trade name “A525 / A50”, manufactured by Mitsui Chemicals Polyurethanes).
- Metal foil layer Metal foil C-1: Soft aluminum foil 8079 (Toyo Aluminum Co., Ltd., thickness 40 ⁇ m).
- Treatment agent D-1 “Sodium polyphosphate-stabilized cerium oxide sol” adjusted to a solid content of 10% by mass using distilled water as a solvent. The phosphate was 10 parts by mass with respect to 100 parts by mass of cerium oxide.
- Adhesive resin E-1 Maleic anhydride-modified polypropylene.
- Film F-1 Polyolefin film having a thickness of 40 ⁇ m.
- Coating solution G-1 A 1,6-hexamethylene diisocyanate burette in acrylic polyol was dissolved in toluene so that (NCO / OH) was 2 (the ratio of NCO to OH was 2).
- Coating solution G-2 A coating solution obtained by dissolving an isocyanurate of 1,6-hexamethylene diisocyanate in toluene so that (NCO / OH) is 2 and adding silica as a filler to acrylic polyol.
- Coating liquid G-3 A coating liquid obtained by dissolving a 1,6-hexamethylene diisocyanate burette body and an isocyanurate body in toluene so that (NCO / OH) is 2 and adding silica as a filler to acrylic polyol. The ratio between the burette body and the isocyanurate body was 1: 1.
- Coating liquid G-4 A coating liquid in which 1,6-hexamethylene diisocyanate burette body and adduct body are dissolved in toluene so that (NCO / OH) is 2 and silica is added as a filler to acrylic polyol. The ratio of the burette body and the adduct body was 1: 1.
- Coating liquid G-5 A coating liquid in which an adduct of tolylene diisocyanate, which is an aromatic isocyanate, is dissolved in toluene so that (NCO / OH) is 2, and silica is added as a filler.
- Coating solution G-6 A coating solution obtained by dissolving an adduct of 1,6-hexamethylene diisocyanate in acrylic polyol in toluene so that (NCO / OH) is 2, and adding silica as a filler.
- Coating solution G-7 A coating solution in which a uret body of 1,6-hexamethylene diisocyanate is dissolved in toluene so that (NCO / OH) is 2 and silica is added as a filler to a polyester polyol.
- Coating solution G-8 A coating solution in which an isocyanurate of 1,6-hexamethylene diisocyanate is dissolved in toluene so that (NCO / OH) is 2, and silica is added as a filler.
- Coating solution G-9 A coating solution in which a 1,6-hexamethylene diisocyanate burette body and an isocyanurate body are dissolved in toluene so that (NCO / OH) is 2 and silica is added as a filler to a polyester polyol. The ratio between the burette body and the isocyanurate body was 1: 1.
- Coating solution G-10 A coating solution in which a 1,6-hexamethylene diisocyanate burette body and an adduct body are dissolved in toluene so that (NCO / OH) is 2 and silica is added as a filler to polyester polyol. The ratio of the burette body and the adduct body was 1: 1.
- Coating solution G-11 A coating solution in which an adduct of tolylene diisocyanate, an aromatic isocyanate, is dissolved in toluene so that (NCO / OH) is 2 and silica is added as a filler to polyester polyol.
- Coating solution G-12 A coating solution obtained by dissolving an adduct of 1,6-hexamethylene diisocyanate in polyester polyol in toluene so that (NCO / OH) is 2, and adding silica as a filler.
- Coating solution G-13 A coating solution obtained by dissolving a 1,6-hexamethylene diisocyanate burette in acrylic polyol in toluene so that (NCO / OH) is 10 and adding silica as a filler.
- Coating solution G-14 A coating solution obtained by dissolving a 1,6-hexamethylene diisocyanate burette in polyester polyol in toluene so that (NCO / OH) is 20, and adding silica as a filler.
- the treating agent D-1 was applied to one surface of the metal foil C-1 (the first surface of the metal foil layer) and dried to form a corrosion prevention treatment layer 14 on one surface of the metal foil layer 13.
- the film A-1 is bonded to the opposite surface (second surface of the metal foil layer) of the corrosion prevention treatment layer 14 in the metal foil layer 13 by using an adhesive B-1 by the dry laminating method.
- the base material layer 11 was laminated via the layer 12. Thereafter, aging was performed at 60 ° C. for 6 days.
- the adhesive resin E-1 is extruded by an extrusion device to the corrosion prevention treatment layer 14 (position close to the first surface of the thin metal layer) of the obtained laminate, and the film F-1 is bonded and sandwich lamination is performed.
- the sealant layer 16 was bonded through the second adhesive layer 15.
- the obtained laminate 160 ° C., and thermocompression bonding with 4kg / cm 2, 2m / min conditions.
- aging is performed at 40 ° C. for 3 days.
- the base material protective layer 17 was formed, and the exterior materials of Examples 1 to 4 and Comparative Examples 1 and 2 were produced.
- the electrolyte solution was wiped one place at a certain time interval, and the same part was wiped again with a waste impregnated with isopropyl alcohol (IPA), and the appearance was visually evaluated. Evaluation was made in the following three stages. Alteration or peeling of the substrate protective layer was confirmed within 12 hours: x (insufficient) Alteration or peeling of the base material protective layer was confirmed within 12 hours to 24 hours: ⁇ (fair) Neither deterioration nor peeling of the base material protective layer was observed even after 24 hours of wiping: ⁇ (excellent)
- Table 1 shows the results of alcohol resistance evaluation and electrolyte resistance evaluation.
- the moldability of the exterior material was evaluated by the following method.
- the following 10 types of coating liquids were prepared, and an exterior material was prepared in the same procedure as in the previous example.
- Coating solution G-7 1,6-hexamethylene diisocyanate burette and adduct in acrylic polyol were dissolved in toluene so that (NCO / OH) was 2, and silica (average particle size 1 ⁇ m) was used as a filler.
- the ratio between the burette body and the adduct body was 1: 9.
- Coating solution G-8 A 1,6-hexamethylene diisocyanate burette body and adduct body were dissolved in toluene so that (NCO / OH) was 2 in acrylic polyol, and silica (average particle diameter 1 ⁇ m) was used as a filler. Added coating liquid. The ratio between the burette body and the adduct body was 2: 8.
- Coating solution G-9 1,6-hexamethylene diisocyanate burette body and adduct body were dissolved in toluene so that (NCO / OH) was 2 in acrylic polyol, and silica (average particle diameter 1 ⁇ m) was used as a filler. Added coating liquid.
- the ratio of burette body and adduct body was 3: 7.
- Coating solution G-10 1,6-hexamethylene diisocyanate burette body and adduct body were dissolved in toluene so that (NCO / OH) was 2 in acrylic polyol, and silica (average particle diameter 1 ⁇ m) was used as a filler. Added coating liquid.
- the ratio between the burette body and the adduct body was 4: 6.
- Coating liquid G-11 A 1,6-hexamethylene diisocyanate burette body and adduct body were dissolved in toluene so that (NCO / OH) would be 2 in acrylic polyol, and silica (average particle diameter 1 ⁇ m) was used as a filler.
- Coating solution G-12 A 1,6-hexamethylene diisocyanate burette body and an adduct body were dissolved in toluene so that (NCO / OH) was 2, and silica (average particle diameter 1 ⁇ m) was used as a filler. Added coating liquid. The ratio between the burette body and the adduct body was 1: 9.
- Coating solution G-13 A 1,6-hexamethylene diisocyanate burette and adduct in polyester polyol were dissolved in toluene so that (NCO / OH) was 2, and silica (average particle size 1 ⁇ m) was used as a filler.
- Coating solution G-14 A 1,6-hexamethylene diisocyanate burette and adduct in polyester polyol were dissolved in toluene so that (NCO / OH) was 2, and silica (average particle diameter 1 ⁇ m) was used as a filler. Added coating liquid. The ratio of burette body and adduct body was 3: 7.
- Coating solution G-15 1,6-hexamethylene diisocyanate burette body and adduct body were dissolved in toluene so that (NCO / OH) was 2, and silica (average particle size 1 ⁇ m) was used as a filler. Added coating liquid.
- the ratio between the burette body and the adduct body was 4: 6.
- Coating solution G-16 1,6-hexamethylene diisocyanate burette and adduct in polyester polyol were dissolved in toluene so that (NCO / OH) was 2, and silica (average particle size 1 ⁇ m) was used as a filler. Added coating liquid.
- the ratio of burette body and adduct body was 5: 5.
- the film depth of the exterior material was set to 150 mm ⁇ 200 mm, and the molding depth at which molding was possible without damage such as cracks and breakage at a molding size of 50 mm ⁇ 69 mm was measured.
- the evaluation criteria are as follows. 4.0 mm or more: ⁇ (fair) Less than 4.0 mm: x (insufficient)
- the molding was performed at a molding speed of 5 mm / sec using a punch die having a vertical R of 0.6 mm and a corner R of 1.0 mm.
- an adhesive layer may be provided between the base material protective layer and the base material layer, and a pigment may be mixed in the adhesive layer or the first adhesive layer. If it does in this way, the elasticity modulus of an adhesion layer can be adjusted and it becomes possible to raise reliability, such as deep drawing of an exterior material, high temperature resistance after extension, humidity resistance, and electrolyte solution resistance.
- a pigment may be mixed in the adhesive layer or the first adhesive layer.
Abstract
Description
本願は、2013年9月24に日本に出願された特願2013-197043号に基づき優先権を主張し、その内容をここに援用する。
リチウムイオン電池等の蓄電デバイスの製造時において、ロットトレース等を目的として、インクジェットプリントにより外装材の表面にバーコード等を印字することがある。印字ミスがあった場合は、アルコール等を用いてインクを除去してから外装材の表面に再印字をする。しかしながら、基材保護層を形成する材料の種類によっては、基材保護層はアルコールに対する耐性を有しておらず、インクと共に基材保護層が剥がれてしまう場合がある。
また、蓄電デバイスの製造工程で外装材表面に電解液が付着した場合にも、アルコールを用いて電解液を拭き取る場合がある。この場合も、基材保護層がはがれて電解液耐性が失われることがある。
上記のいずれの場合も、外装材の再利用ができなくなるため、蓄電デバイスの製造効率が低下するといった問題がある。
前記基材層の前記第2の面に積層され、水酸基を有する基を側鎖に有するポリエステルポリオール及びアクリルポリオールからなる群から選ばれる少なくとも1種の主剤と、イソシアネートのビューレット体およびイソシアヌレート体の少なくとも一方を含む硬化剤とを含んで形成された基材保護層とを備える。
本発明の一態様の蓄電デバイス用外装材においては、前記硬化剤の全体質量に対して、前記ビューレット体が占める割合が10質量パーセント以上40質量パーセント以下であってもよい。
本発明の一態様の蓄電デバイス用外装材においては、前記硬化剤が、前記ビューレット体および前記イソシアヌレート体の一方のみの材料で構成されてもよい。
本発明の一態様の蓄電デバイス用外装材においては、前記硬化剤が、前記ビューレット体および前記イソシアヌレート体の両方のみの材料で構成されてもよい。
本発明の一態様の蓄電デバイス用外装材においては、前記第1接着層がフィラーを含有してもよい。
本実施形態の蓄電デバイス用外装材1(以下、単に「外装材1」という。)は、図1に示すように、基材層11の第1の面に、第1接着層12、金属箔層13、腐食防止処理層14、第2接着層15、及びシーラント層16が順次積層され、基材層11の第2の面に基材保護層17が積層された積層体である。外装材1を蓄電デバイス用外装材として用いる際には、基材保護層17が最外層に位置するように、シーラント層16が最内層に位置するように、外装材1は使用される。外装材1は、基材層11の外側(第2の面に近い位置)に基材保護層17が積層されている外装材である。
基材保護層17は、基材層11の外側の面(第2の面)に積層される層であり、水酸基を有する基(官能基)を側鎖に有するポリエステルポリオール及びアクリルポリオールからなる群から選ばれる少なくとも1種(以下、これらをまとめて「ポリオール」ということがある。)の主剤と、イソシアネートのビューレット体およびイソシアヌレート体の少なくとも一方を含む硬化剤とで形成される。
ポリエステルポリオール(a1)としては、例えば、二塩基酸の1種以上と、水酸基を3つ以上有する化合物の1種以上とを反応させることで得られるポリエステルポリオールが挙げられる。水酸基を3つ以上有する化合物の水酸基のうちの未反応の部位が、ポリエステルポリオール(a1)の側鎖の水酸基となる。
二塩基酸としては、例えば、コハク酸、グルタル酸、アジピン酸、ピメリン酸、スベリン酸、アゼライン酸、セバシン酸、ブラシル酸等の脂肪族系二塩基酸;イソフタル酸、テレフタル酸、ナフタレンジカルボン酸等の芳香族系二塩基酸等が挙げられる。
水酸基を3つ以上有する化合物としては、例えば、ヘキサントリオール、トリメチロールプロパン、ペンタエリスリトール等が挙げられる。
ジオールとしては、例えば、エチレングリコール、プロピレングリコール、ブタンジオール、ネオペンチルグリコール、メチルペンタンジオール、ヘキサンジオール、ヘプタンジオール、オクタンジオール、ノナンジオール、デカンジオール、ドデカンジオール等の脂肪族系ジオール;シクロヘキサンジオール、水添キシリレングリコール等の脂環式系ジオール;キシリレングリコール等の芳香族系ジオール等が挙げられる。
2官能以上のイソシアネート化合物としては、例えば、2,4-もしくは2,6-トリレンジイソシアネート、キシリレンジイソシアネート、4,4’-ジフェニルメタンジイソシアネート、メチレンジイソシアネート、イソプロピレンジイソシアネート、リジンジイソシアネート、2,2,4-もしくは2,4,4-トリメチルヘキサメチレンジイソシアネート、1,6-ヘキサメチレンジイソシアネート、メチルシクロヘキサンジイソシアネート、イソホロンジイソシアネート、4,4’-ジシクロヘキシルメタンジイソシアネート、イソプロピリデンジシクロヘキシル-4,4’-ジイソシアネート等が挙げられる。また、これらイソシアネート化合物のアダクト体、ビューレット体、イソシアヌレート体を用いて鎖伸長したポリエステルウレタンポリオールでもよい。
アクリルポリオール(a2)としては、例えば、少なくとも水酸基含有アクリルモノマーと(メタ)アクリル酸とを共重合して得られる、(メタ)アクリル酸に由来する繰り返し単位を主成分とする共重合体が挙げられる。
水酸基含有アクリルモノマーとしては、2-ヒドロキシエチル(メタ)アクリレート、2-ヒドロキシプロピル(メタ)アクリレート等が挙げられる。
水酸基含有アクリルモノマー及び(メタ)アクリル酸と共重合する成分としては、アルキル(メタ)アクリレート系モノマー(アルキル基としては、メチル基、エチル基、n-プロピル基、i-プロピル基、n-ブチル基、i-ブチル基、t-ブチル基、2-エチルヘキシル基、シクロヘキシル基等が挙げられる。);(メタ)アクリルアミド、N-アルキル(メタ)アクリルアミド、N,N-ジアルキル(メタ)アクリルアミド(アルキル基としては、メチル基、エチル基、n-プロピル基、i-プロピル基、n-ブチル基、i-ブチル基、t-ブチル基、2-エチルヘキシル基、シクロヘキシル基等が挙げられる。)、N-アルコキシ(メタ)アクリルアミド、N,N-ジアルコキシ(メタ)アクリルアミド(アルコキシ基としては、メトキシ基、エトキシ基、ブトキシ基、イソブトキシ基等が挙げられる。)、N-メチロール(メタ)アクリルアミド、N-フェニル(メタ)アクリルアミド等のアミド基含有モノマー;グリシジル(メタ)アクリレート、アリルグリシジルエーテル等のグリシジル基含有モノマー;(メタ)アクリロキシプロピルトリメトキシシラン、(メタ)アクリロキシプロピルトリエトキシラン等のシラン含有モノマー;(メタ)アクリロキシプロピルイソシアネート等のイソシアネート基含有モノマーが挙げられる。
ポリオールは、求められる機能や性能に応じて使用でき、1種を単独で使用してもよく、2種以上を併用してもよい。
主剤のポリオールが有する水酸基と、硬化剤のイソシアネートが有するイソシアネート基のモル比(NCO/OH)は、0.5~50が好ましく、1~20がより好ましい。前記モル比(NCO/OH)が下限値(0.5)以上の場合は、耐傷性、電解液耐性が向上する。前記モル比(NCO/OH)が上限値(50)以下の場合は、基材保護層と基材との接着性を確保しやすい。
基材保護層17の厚さが上限値(10μm)以下の場合は、基材を薄型化しやすく延伸性能が得られやすい。
フィラーの平均粒径が0.2μmより小さいと十分な滑性が得られないことがあり、平均粒径が3μmより大きいと基材保護層が脆くなることがあることより、フィラーの平均粒径は、0.2μm以上3μm未満であることが好ましい。
滑剤としては、例えば、オレイン酸アミド、エルカ酸アミド、ステアリン酸アミド、ベヘニン酸アミド、エチレンビスオレイン酸アミド、エチレンビスエルカ酸アミド等の脂肪酸アミドが挙げられる。アンチブロッキング剤としては、シリカ等の各種フィラー系のアンチブロッキング剤が好ましい。
上述した添加剤のうち1種を単独で使用してもよく、2種以上を併用してもよい。
基材層11は、蓄電デバイスを製造する際のシール工程における耐熱性を付与し、成型加工や流通の際に起こりうるピンホールの発生を抑制する役割を果たす。特に大型用途のリチウムイオン電池の外装材の場合等は、耐擦傷性、耐薬品性、絶縁性等も付与できる。
基材層11は、絶縁性を有する樹脂により形成された樹脂フィルムが好ましい。前記樹脂フィルムとしては、ポリエステルフィルム、ポリアミドフィルム、ポリプロピレンフィルム等の延伸又は未延伸フィルム等が挙げられる。基材層11は、上記の樹脂フィルムで構成された単層フィルムであってもよく、上記の樹脂フィルムを2種以上使用した積層フィルムであってもよい。
基材層11としては、前記した材料のなかでも、成型性に優れることから、ポリアミドフィルムが好ましい。ポリアミドフィルムを形成するポリアミド樹脂としては、ナイロン6、ナイロン11、ナイロン12、ナイロン66、ナイロン610、ナイロン612等が挙げられる。
第1接着層12は、基材層11と金属箔層13との間に形成される。第1接着層12は、基材層11と金属箔層13とを強固に接着するために必要な密着力を有するのみでなく、冷間成型する際には基材層11によって金属箔層13が破断されることを保護するための追随性(部材が変形・伸縮したとしても、剥離することなく部材上に第1接着層12を確実に形成するための性能)等も求められる。
第1接着層12としては、ポリエステルポリオール、ポリエーテルポリオール、アクリルポリオール等のポリオールを主剤として用い、芳香族系や脂肪族系のイソシアネートを硬化剤に用いた二液硬化型のポリウレタン系接着剤等が挙げられる。前記主剤における水酸基に対する硬化剤のイソシアネート基のモル比(NCO/OH)は、1~10が好ましく、2~5がより好ましい。
また、第1接着層12には、高温条件下(80℃、3日)での延伸部のデラミネーションを防止する目的として、無機物等のフィラー、顔料を適量添加することが好ましい。顔料は、有機顔料もしくは無機顔料、又は、それら顔料の混合物であってもよい。フィラーは、有機フィラーもしくは無機フィラー、又はそれらの混合物であってもよい。
基材層11や第1接着層12には、外装材の延伸時の金属箔層13の破断を抑制する機能も求められる。本発明の実施形態における第1接着層12は、基材層11及び金属箔層13のそれぞれに対する高い密着性に加えて、優れた追従性、金属箔層13に近い弾性率が達成されるため、外装材の深絞りや延伸後の信頼性が高まる。
有機顔料としては、例えば、アゾ系、フタロシアニン系、キナクリドン系、アンスラキノン系、ジオキサジン系、インジゴチオインジゴ系、ペリノン-ペリレン系、イソインドレニン系等が挙げられ、無機顔料としては、カーボンブラック系、酸化チタン系、カドミウム系、鉛系、酸化クロム系等が挙げられ、その他に、マイカ(雲母)の微粉末、魚鱗箔等が挙げられる。
顔料としては、第1接着層12における前記ポリオール及び硬化剤で形成されるウレタン樹脂に対する密着性から、前記硬化剤のイソシアネート基と結合する官能基を有する顔料を用いることが好ましい。前記官能基としては、水酸基等が挙げられる。
黄色:イソインドリノン、イソインドリン、キノフタロン、アントラキノン(フラバトロン)、アゾメチン、キサンテン等。
橙色:ジケトピロロピロール、ペリレン、アントラキノン、ペリノン、キナクリドン等。
赤色:アントラキノン、キナクリドン、ジケトピロロピロール、ペリレン、インジゴイド等。
紫色:オキサジン(ジオキサジン)、キナクリドン、ペリレン、インジゴイド、アントラキノン、キサンテン、ベンツイミダゾロン、ビオランスロン等。
青色:フタロシアニン、アントラキノン、インジゴイド等。
緑色:フタロシアニン、ペリレン、アゾメチン等。
白色:亜鉛華、鉛白、リトポン、二酸化チタン、沈降性硫酸バリウム、バライト粉等。
赤色:鉛丹、酸化鉄赤等。
黄色:黄鉛、亜鉛黄(亜鉛黄1種、亜鉛黄2種)等。
青色:ウルトラマリン青、プロシア青(フェロシアン化鉄カリウム)等。
黒色:カーボンブラック等。
弾性率が高いフィラーは信頼性の向上に寄与することから、無機フィラーを用いることが好ましい。
第1接着層12に含まれる顔料及びフィラーは、1種であってもよく、2種以上であってもよい。
金属箔層13としては、アルミニウム、ステンレス綱等の各種金属箔を使用することができ、防湿性、延展性等の加工性、コストの面から、アルミニウム箔が好ましい。
アルミニウム箔としては、例えば、公知の軟質アルミニウム箔が使用でき、所望の耐ピンホール性、及び成型時の延展性を得るために、鉄を含むアルミニウム箔が好ましい。アルミニウム箔(100質量%)中の鉄の含有量は、0.1~9.0質量%が好ましく、0.5~2.0質量%がより好ましい。鉄の含有量が下限値(0.1質量%)以上の場合は、耐ピンホール性、延展性が向上する。鉄の含有量が上限値(9.0質量%)以下の場合は、柔軟性が向上する。
また、アルミニウム箔としては、所望の成型時の延展性を付与できるために、焼鈍処理を施した軟質アルミニウム箔がさらに好ましい。
特に好ましい金属箔層13は、厚さ15~150μmの焼鈍処理した軟質アルミニウム箔である。具体的には、JIS規格で8021材、8079材が好ましい。
脱脂処理としては、大きく区分するとウェットタイプの脱脂処理とドライタイプの脱脂処理に分けられ、製造工程を簡便にするためには、ドライタイプの脱脂処理が好ましい。
ドライタイプの脱脂処理としては、例えば、アルミニウム箔を焼鈍処理する工程において、その処理時間を長くすることで脱脂処理を行う方法が挙げられる。アルミニウム箔を軟質化するために施される焼鈍処理の際に、同時に行われる脱脂処理程度でも充分な耐電解液性が得られる。また、前記脱脂処理の他にも、フレーム処理、コロナ処理等が挙げられる。さらに、特定波長の紫外線を照射して発生する活性酸素により、汚染物質を酸化分解及び除去する脱脂処理を採用してもよい。
酸脱脂に使用する酸としては、例えば、硫酸、硝酸、塩酸、フッ酸等の無機酸が挙げられる。上記の酸は、1種を単独で使用してもよく、2種以上を併用してもよい。アルカリ脱脂に使用するアルカリとしては、例えば、エッチング効果が高い水酸化ナトリウム等が挙げられる。また、弱アルカリ系や界面活性剤が配合された材料が挙げられる。
ウェットタイプの脱脂処理は、浸漬法やスプレー法によって行われる。
腐食防止処理層14は、金属箔層13と第2接着層15を強固に密着させると共に、金属箔層13を、電解液や、電解液から発生するフッ酸から保護する役割を果たす。
腐食防止処理層14は、例えば、熱水変成処理、陽極酸化処理、化成処理、あるいはこれら処理の組み合わせにより形成できる。
熱水変成処理としては、例えば、トリエタノールアミンを添加した沸騰水中にアルミニウム箔を浸漬処理することで得られるベーマイト処理が挙げられる。陽極酸化処理としては、例えば、アルマイト処理が挙げられる。化成処理としては、例えば、クロメート処理、ジルコニウム処理、チタニウム処理、バナジウム処理、モリブデン処理、リン酸カルシウム処理、水酸化ストロンチウム処理、セリウム処理、ルテニウム処理、あるいはこれらの処理にて用いられる材料を含む混合相からなる各種化成処理が挙げられる。また、これらの化成処理は湿式型に限らず、これらの処理にて用いられる材料を含む処理剤と樹脂成分とを混合し、これによって混合材料を金属箔層13に塗布する方法も適用できる。
以上、上記の腐食防止処理の中でも、腐食防止処理によって得られる効果を最大限にするとともに廃液処理の観点からも塗布型クロメート処理が好ましい。
第2接着層15は、腐食防止処理層14とシーラント層16とを接着する層である。外装材1は、第2接着層15の種類によって、熱ラミネート構成とドライラミネート構成との2種類に大別される。
ドライラミネート構成の場合、第2接着層15を形成する成分として、第1接着層12で挙げた接着剤と同じ接着剤を使用できる。この場合、電解液による膨潤やフッ酸による加水分解を抑制するため、使用する接着剤は、加水分解し難い骨格の主剤を使用する、架橋密度を向上させる、等の組成設計をする必要がある。
前記主剤に対する硬化剤としては、ポリエステルポリオールの鎖伸長剤としても使用できるイソシアネート化合物を用いることが可能である。これにより、接着剤塗膜の架橋密度が高まり、溶解性や膨潤性の向上につながるとともに、ウレタン基濃度が高まることで基材密着性の向上も期待される。
第2接着層15を構成する成分としては、電解液が浸透してきてもシーラント層16と金属箔層13との密着力を維持しやすくするために、ポリオレフィン系樹脂を無水マレイン酸でグラフト変性させた、無水マレイン酸変性ポリオレフィン系樹脂が好ましく、無水マレイン酸変性ポリプロピレンが特に好ましい。
第2接着層15に配合するエラストマーとしては、オレフィン系エラストマー、スチレン系エラストマーが挙げられる。配合するエラストマーの平均粒径は、エラストマーと接着樹脂との相溶性が向上し、また第2接着層15の異方性を緩和する効果を向上させるためには、200nm以下が好ましい。なお、前記平均粒径は、電子顕微鏡により、エラストマー組成物の断面を拡大した写真を撮影し、画像解析により、分散した架橋ゴム成分の平均粒径を測定することで測定される。
上述したエラストマーは1種を単独で使用してもよく、2種以上を併用してもよい。
第2接着層15の厚さは、1~40μmが好ましく、5~20μmがより好ましい。
シーラント層16は、外装材1の内層であり、電池組み立て時に熱溶着される層である。つまり、シーラント層16は、熱溶着性のフィルムで構成された層である。
シーラント層16を構成するフィルムの成分としては、ポリオレフィン系樹脂、ポリオレフィン系樹脂を無水マレイン酸等でグラフト変性した酸変性ポリオレフィン系樹脂が挙げられる。なかでも、水蒸気バリア性を向上させ、ヒートシールによって過度に潰れることなく電池形態を形成しやすくするためには、ポリオレフィン系樹脂が好ましく、ポリプロピレンが特に好ましい。ポリプロピレンとしては、第2接着層15において例示したポリプロピレンが挙げられる。
シーラント層16は、前記した各種樹脂が混合されたフィルムにより形成してもよい。
シーラント層16は、単層フィルムであってもよく、多層フィルムであってもよい。
シーラント層16が積層フィルムである場合は、積層フィルムを構成する複数層のうちいずれかの層のみにエラストマーを配合してもよく、全ての層に配合してもよい。例えば、シーラント層16がランダムポリプロピレン/ブロックポリプロピレン/ランダムポリプロピレンの3層で構成されている場合、エラストマーは、ブロックポリプロピレンの層のみに配合してもよく、ランダムポリプロピレンの層のみに配合してもよく、ランダムポリプロピレンの層とブロックポリプロピレンとの層の両方に配合してもよい。
以下、外装材1の製造方法について説明する。ただし、外装材1の製造方法は以下に記載する方法には限定されない。
外装材1の製造方法としては、例えば、下記工程(I)~(IV)を有する方法が挙げられる。
(I)金属箔層13上に、腐食防止処理層14を形成する工程。
(II)金属箔層13における腐食防止処理層14を形成した面とは、反対の面に、第1接着層12を介して基材層11を貼り合わせる工程。
(III)金属箔層13の腐食防止処理層14に、第2接着層15を介してシーラント層16を貼り合わせる工程。
(IV)基材層11上に基材保護層17を積層する工程。
金属箔層13の一方の面に、腐食防止処理剤を塗布し、乾燥、硬化、焼付けを行って腐食防止処理層14を形成する。腐食防止処理剤としては、例えば、塗布型クロメート処理用の腐食防止処理剤等が挙げられる。
腐食防止処理剤の塗布方法は特に限定されず、例えば、グラビアコート、グラビアリバースコート、ロールコート、リバースロールコート、ダイコート、バーコート、キスコート、コンマコート等が挙げられる。
なお、金属箔層13には、未処理の金属箔を使用してもよく、ウェットタイプの脱脂処理又はドライタイプの脱脂処理にて脱脂処理を施した金属箔を使用してもよい。
金属箔層13における腐食防止処理層14を形成した面とは、反対の面に、第1接着層12を形成する接着剤を用いて基材層11を貼り合わせる。
貼り合わせる方法としては、ドライラミネーション、ノンソルベントラミネーション、ウェットラミネーション等の手法が挙げられる。
工程(II)では、接着性の促進のため、室温~100℃の範囲でエージング(養生)処理を行ってもよい。
基材層11、第1接着層12、金属箔層13及び腐食防止処理層14がこの順に積層された積層体の腐食防止処理層14側に、第2接着層15を介してシーラント層16を貼り合わせる。
ドライラミネート構成の場合は、前述の接着剤を使用し、前記積層体の腐食防止処理層14に、ドライラミネーション、ノンソルベントラミネーション、ウェットラミネーション等の手法でシーラント層16を貼り合わせる。
基材層11の外側の面(第2の面)に、基材保護層17を積層する。基材保護層17を基材層11の外側の面(第2の面)に積層する方法としては、例えば、基材保護層17を形成するウレタン樹脂のディスパージョンタイプの塗工液を調製し、ディッピング、スプレー法等の各種塗工方法で塗工した後、加熱して溶媒を揮発させ、焼き付けを行う方法が挙げられる。また、基材保護層17は、前記ウレタン樹脂を溶融させて押出す押出成型等で形成することもできる。また、基材保護層17の外表面には、マット処理等の加工を施してもよい。
なお、外装材1の製造方法は、前記工程(I)~(IV)を順次実施する方法には限定されない。例えば、工程(II)を行ってから工程(I)を行ってもよい。また、工程(IV)を行った後に工程(II)を行ってもよい。また、腐食防止処理層14の形成と、第2接着層15上にシーラント層16を積層する押出ラミネーションをインラインで連続的に行ってもよい。また、金属箔層の両面に腐食防止処理層を設けてもよい。
[基材層]
フィルムA-1:厚さ25μmのナイロン6フィルム。
[第1接着層]
接着剤B-1:ポリウレタン系接着剤(商品名「A525/A50」、三井化学ポリウレタン社製)。
[金属箔層]
金属箔C-1:軟質アルミニウム箔8079材(東洋アルミニウム社製、厚さ40μm)。
[腐食防止処理層]
処理剤D-1:溶媒として蒸留水を使用し、固形分濃度10質量%に調整した「ポリリン酸ナトリウム安定化酸化セリウムゾル」。酸化セリウム100質量部に対して、リン酸塩は10質量部とした。
[第2接着層]
接着樹脂E-1:無水マレイン酸変性ポリプロピレン。
[シーラント層]
フィルムF-1:厚さ40μmのポリオレフィンフィルム。
基材保護層の材料としては、下記に示す14種類の塗液を準備した。
塗液G-1:アクリルポリオールに1,6-ヘキサメチレンジイソシアネートのビューレット体を(NCO/OH)が2となるよう(OHに対するNCOの比が2となるように)にトルエンに溶解させ、フィラーとしてシリカ(平均粒径1μm)を添加した塗液。
塗液G-2:アクリルポリオールに1,6-ヘキサメチレンジイソシアネートのイソシアヌレート体を(NCO/OH)が2となるようにトルエンに溶解させ、フィラーとしてシリカを添加した塗液。
塗液G-3:アクリルポリオールに1,6-ヘキサメチレンジイソシアネートのビューレット体とイソシアヌレート体を(NCO/OH)が2となるようにトルエンに溶解させ、フィラーとしてシリカを添加した塗液。ビューレット体とイソシアヌレート体の比率は1:1とした。
塗液G-4:アクリルポリオールに1,6-ヘキサメチレンジイソシアネートのビューレット体とアダクト体を(NCO/OH)が2となるようにトルエンに溶解させ、フィラーとしてシリカを添加した塗液。ビューレット体とアダクト体の比率は1:1とした。
塗液G-5:アクリルポリオールに芳香族イソシアネートであるトリレンジイソシアネートのアダクト体を(NCO/OH)が2となるようにトルエンに溶解させ、フィラーとしてシリカを添加した塗液。
塗液G-6:アクリルポリオールに1,6-ヘキサメチレンジイソシアネートのアダクト体を(NCO/OH)が2となるようにトルエンに溶解させ、フィラーとしてシリカを添加した塗液。
塗液G-7:ポリエステルポリオールに1,6-ヘキサメチレンジイソシアネートのビューレット体を(NCO/OH)が2となるようにトルエンに溶解させ、フィラーとしてシリカを添加した塗液。
塗液G-8:ポリエステルポリオールに1,6-ヘキサメチレンジイソシアネートのイソシアヌレート体を(NCO/OH)が2となるようにトルエンに溶解させ、フィラーとしてシリカを添加した塗液。
塗液G-9:ポリエステルポリオールに1,6-ヘキサメチレンジイソシアネートのビューレット体とイソシアヌレート体を(NCO/OH)が2となるようにトルエンに溶解させ、フィラーとしてシリカを添加した塗液。ビューレット体とイソシアヌレート体の比率は1:1とした。
塗液G-10:ポリエステルポリオールに1,6-ヘキサメチレンジイソシアネートのビューレット体とアダクト体を(NCO/OH)が2となるようにトルエンに溶解させ、フィラーとしてシリカを添加した塗液。ビューレット体とアダクト体の比率は1:1とした。
塗液G-11:ポリエステルポリオールに芳香族イソシアネートであるトリレンジイソシアネートのアダクト体を(NCO/OH)が2となるようにトルエンに溶解させ、フィラーとしてシリカを添加した塗液。
塗液G-12:ポリエステルポリオールに1,6-ヘキサメチレンジイソシアネートのアダクト体を(NCO/OH)が2となるようにトルエンに溶解させ、フィラーとしてシリカを添加した塗液。
塗液G-13:アクリルポリオールに1,6-ヘキサメチレンジイソシアネートのビューレット体を(NCO/OH)が10となるようにトルエンに溶解させ、フィラーとしてシリカを添加した塗液。
塗液G-14:ポリエステルポリオールに1,6-ヘキサメチレンジイソシアネートのビューレット体を(NCO/OH)が20となるようにトルエンに溶解させ、フィラーとしてシリカを添加した塗液。
金属箔C-1の一方の面(金属箔層の第1面)に処理剤D-1を塗布、乾燥して、金属箔層13の一方の面に腐食防止処理層14を形成した。次いで、金属箔層13における腐食防止処理層14の反対面(金属箔層の第2面)に、ドライラミネート法により、接着剤B-1を用いてフィルムA-1を貼り合わせ、第1接着層12を介して基材層11を積層した。その後、60℃、6日間のエージングを行った。次に、得られた積層体の腐食防止処理層14(金属薄層の第1面に近い位置)に押出し装置にて接着樹脂E-1を押出し、フィルムF-1を貼り合わせ、サンドイッチラミネーションすることで、第2接着層15を介してシーラント層16を貼り合わせた。その後、得られた積層体に対し、160℃、4kg/cm2、2m/分の条件で加熱圧着した。次いで、基材層11の外側の面(基材層の第2面)に、グラビアコート法にて塗布液G-1~G-14のいずれかを塗布後、エージングを40℃、3日間行うことで基材保護層17を形成し、実施例1から4、および比較例1、2の外装材を作製した。
アルコール耐性評価:作製した基材の基材保護層側を、エタノールを染み込ませたウェスで一方向にこすり、基材保護層が剥がれるまでの回数を計測した。評価は以下の3段階とした。
50回以下:×(insufficient)
50回~100回:○(fair)
100回以上:◎(excellent)
電解液耐性:EC:DEC:DMC=1:1:1+LiPF6を基材保護層の複数箇所に滴下して25度65%RH(相対湿度)の環境に放置した。一定時間経過ごとに1箇所ずつ電解液を拭き取り、さらにイソプロピルアルコール(IPA)を染み込ませたウェスで再度同一箇所の拭き取りを行い、目視にて外観を評価した。評価は以下の3段階とした。
12時間以内に基材保護層の変質または剥離が確認された:×(insufficient)
12時間以上24時間以内に基材保護層の変質または剥離が確認された:○(fair)
24時間後の拭き取りでも基材保護層の変質および剥離のいずれも確認されなかった:◎(excellent)
一方、イソシアネートのビューレット体およびイソシアヌレート体のいずれも含まない硬化剤を用いた比較例1および2、3、4では、基材保護層がはがれやすく、耐性が充分でなかった。
基材保護層の材料として、下記に示す10種類の塗液を準備し、先の実施例と同様の手順で外装材を作製した。
塗液G-7:アクリルポリオールに1,6-ヘキサメチレンジイソシアネートのビューレット体とアダクト体を(NCO/OH)が2となるようにトルエンに溶解させ、フィラーとしてシリカ(平均粒径1μm)を添加した塗液。ビューレット体とアダクト体の比率は1:9とした。
塗液G-8:アクリルポリオールに1,6-ヘキサメチレンジイソシアネートのビューレット体とアダクト体を(NCO/OH)が2となるようにトルエンに溶解させ、フィラーとしてシリカ(平均粒径1μm)を添加した塗液。ビューレット体とアダクト体の比率は2:8とした。
塗液G-9:アクリルポリオールに1,6-ヘキサメチレンジイソシアネートのビューレット体とアダクト体を(NCO/OH)が2となるようにトルエンに溶解させ、フィラーとしてシリカ(平均粒径1μm)を添加した塗液。ビューレット体とアダクト体の比率は3:7とした。
塗液G-10:アクリルポリオールに1,6-ヘキサメチレンジイソシアネートのビューレット体とアダクト体を(NCO/OH)が2となるようにトルエンに溶解させ、フィラーとしてシリカ(平均粒径1μm)を添加した塗液。ビューレット体とアダクト体の比率は4:6とした。
塗液G-11:アクリルポリオールに1,6-ヘキサメチレンジイソシアネートのビューレット体とアダクト体を(NCO/OH)が2となるようにトルエンに溶解させ、フィラーとしてシリカ(平均粒径1μm)を添加した塗液。ビューレット体とアダクト体の比率は5:5とした。
塗液G-12:ポリエステルポリオールに1,6-ヘキサメチレンジイソシアネートのビューレット体とアダクト体を(NCO/OH)が2となるようにトルエンに溶解させ、フィラーとしてシリカ(平均粒径1μm)を添加した塗液。ビューレット体とアダクト体の比率は1:9とした。
塗液G-13:ポリエステルポリオールに1,6-ヘキサメチレンジイソシアネートのビューレット体とアダクト体を(NCO/OH)が2となるようにトルエンに溶解させ、フィラーとしてシリカ(平均粒径1μm)を添加した塗液。ビューレット体とアダクト体の比率は2:8とした。
塗液G-14:ポリエステルポリオールに1,6-ヘキサメチレンジイソシアネートのビューレット体とアダクト体を(NCO/OH)が2となるようにトルエンに溶解させ、フィラーとしてシリカ(平均粒径1μm)を添加した塗液。ビューレット体とアダクト体の比率は3:7とした。
塗液G-15:ポリエステルポリオールに1,6-ヘキサメチレンジイソシアネートのビューレット体とアダクト体を(NCO/OH)が2となるようにトルエンに溶解させ、フィラーとしてシリカ(平均粒径1μm)を添加した塗液。ビューレット体とアダクト体の比率は4:6とした。
塗液G-16:ポリエステルポリオールに1,6-ヘキサメチレンジイソシアネートのビューレット体とアダクト体を(NCO/OH)が2となるようにトルエンに溶解させ、フィラーとしてシリカ(平均粒径1μm)を添加した塗液。ビューレット体とアダクト体の比率は5:5とした。
4.0mm以上:○(fair)
4.0mm未満:×(insufficient)
なお成型は、垂直方向のRが0.6mm、コーナーのRが1.0mmのパンチ・ダイを用いて成型速度5mm/secで行った。
11 基材層
12 第1接着層
13 金属箔層
14 腐食防止処理層
15 第2接着層
16 シーラント層
17 基材保護層
Claims (8)
- 第1の面と第2の面とを有し、前記第1の面に少なくとも第1接着層、金属箔層、腐食防止処理層、第2接着層、及びシーラント層が順次積層された基材層と、
前記基材層の前記第2の面に積層され、水酸基を有する基を側鎖に有するポリエステルポリオール及びアクリルポリオールからなる群から選ばれる少なくとも1種の主剤と、イソシアネートのビューレット体およびイソシアヌレート体の少なくとも一方を含む硬化剤とを含んで形成された基材保護層と、
を備える蓄電デバイス用外装材。 - 前記硬化剤の全体質量に対して、前記ビューレット体および前記イソシアヌレート体が占める割合が10質量パーセント以上である、請求項1に記載の蓄電デバイス用外装材。
- 前記硬化剤の全体質量に対して、前記ビューレット体が占める割合が10質量パーセント以上40質量パーセント以下である、請求項1に記載の蓄電デバイス用外装材。
- 前記硬化剤が、前記ビューレット体および前記イソシアヌレート体の一方のみの材料で構成されている、請求項1に記載の蓄電デバイス用外装材。
- 前記硬化剤が、前記ビューレット体および前記イソシアヌレート体の両方のみの材料で構成されている、請求項1に記載の蓄電デバイス用外装材。
- 前記イソシアネートが、1,6-ヘキサメチレンジイソシアネートである、請求項1から請求項5のいずれか一項に記載の蓄電デバイス用外装材。
- 前記基材保護層がフィラーを含有する、請求項1から請求項6のいずれか一項に記載の蓄電デバイス用外装材。
- 前記第1接着層がフィラーを含有する、請求項1から請求項7のいずれか一項に記載の蓄電デバイス用外装材。
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KR102269306B1 (ko) | 2021-06-25 |
CN105580154B (zh) | 2020-06-30 |
EP3051605A4 (en) | 2017-03-22 |
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US20160204395A1 (en) | 2016-07-14 |
TW201521268A (zh) | 2015-06-01 |
EP3051605A1 (en) | 2016-08-03 |
JPWO2015045887A1 (ja) | 2017-03-09 |
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EP3051605B1 (en) | 2018-07-25 |
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US10471685B2 (en) | 2019-11-12 |
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