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WO2019026829A1 - Procédé de production d'un film conducteur, film conducteur et encre à nanofils métalliques - Google Patents

Procédé de production d'un film conducteur, film conducteur et encre à nanofils métalliques Download PDF

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Publication number
WO2019026829A1
WO2019026829A1 PCT/JP2018/028412 JP2018028412W WO2019026829A1 WO 2019026829 A1 WO2019026829 A1 WO 2019026829A1 JP 2018028412 W JP2018028412 W JP 2018028412W WO 2019026829 A1 WO2019026829 A1 WO 2019026829A1
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Prior art keywords
conductive film
metal nanowire
metal
nanowires
average
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Japanese (ja)
Inventor
山木　繁
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Resonac Holdings Corp
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Showa Denko KK
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Priority to CN201880038335.9A priority Critical patent/CN110720129B/zh
Priority to KR1020197036305A priority patent/KR102393615B1/ko
Priority to JP2019534490A priority patent/JP7300991B2/ja
Publication of WO2019026829A1 publication Critical patent/WO2019026829A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/12—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a coating with specific electrical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/02—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber
    • B05D7/04—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber to surfaces of films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/20—Conductive material dispersed in non-conductive organic material
    • H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/0036—Details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
    • H01B5/14—Non-insulated conductors or conductive bodies characterised by their form comprising conductive layers or films on insulating-supports
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/09—Use of materials for the conductive, e.g. metallic pattern

Definitions

  • the present invention relates to a method of producing a conductive film, a conductive film and a metal nanowire ink.
  • metal nanowires have attracted attention as a raw material of a highly transparent and highly conductive thin film as an alternative to an ITO (indium tin oxide) film used for transparent electrodes of touch panels and the like.
  • ITO indium tin oxide
  • Such metal nanowires are generally manufactured by heating a metal compound in the presence of polyvinyl pyrrolidone and a polyol such as ethylene glycol (Non-patent Document 1).
  • Patent Document 1 describes a method for producing a transparent conductor, which comprises the step of drying a fluid in which metal nanowires are dispersed to form a metal nanowire network layer on a substrate, and carboxymethylcellulose and 2-hydroxyethylcellulose. Hydroxypropyl methylcellulose, methylcellulose, polyvinyl alcohol, tripropylene glycol, and xanthan gum may be included in the fluid.
  • Patent Document 2 includes a coated transparent support and a random network of silver nanowires dispersed in a cellulose ester polymer (cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, or a mixture thereof)
  • a transparent conductive article comprising: a transparent conductive film.
  • Patent Document 3 describes metal nanowires, binders (binder (A): polysaccharides (hydroxypropyl guar gum and derivatives thereof, hydroxypropyl methylcellulose and derivatives thereof, and methylcellulose and derivatives thereof) and binders (B): aqueous A metal nanowire-containing coating film formed by a composition containing a metal nanowire containing a polyester resin, an aqueous polyurethane resin, at least one selected from an aqueous acrylic resin and an aqueous epoxy resin, a surfactant, and a solvent is on a substrate There is disclosed a transparent conductor formed in
  • Patent Document 4 includes metal nanowires as conductive fibers, gelatin as a polymer, gelatin derivative, casein, agar, starch, polyvinyl alcohol, a copolymer of polyacrylic acid, carboxymethyl cellulose, hydroxyethyl cellulose, polyvinyl pyrrolidone, A conductive membrane containing dextran, etc. is disclosed.
  • Patent Documents 1 to 4 it is suggested that it is intended to obtain a conductive film having a surface resistance value of 1000 ⁇ / ⁇ or less.
  • a conductive film having a surface resistance value 1000 ⁇ / ⁇ or less.
  • it is necessary to use a corresponding conductive material which causes problems in cost and optical characteristics, and causes a problem in that anisotropy occurs in the conductivity.
  • a dilute coating solution containing metal nanowires is applied to a substrate film to obtain a conductive film having a surface resistance value not so low as 1000 ⁇ / ⁇ or more, the metal nanowires are coated or coated in the coating solution. Cohesion occurs in the subsequent drying step, and as a result, a uniform coated state can not be obtained, and high and low portions of the surface resistance value are generated in the film surface, which causes a problem of increased variation.
  • An object of the present invention is to provide a conductive film which has a reduced amount of metal nanowires used and which has a surface resistance value in the range of 1000 to 10000 ⁇ / ⁇ and which has a small variation in the surface resistance value in the plane.
  • Another object of the present invention is to provide a method for producing a conductive film excellent in productivity and a metal nanowire ink therefor.
  • the present invention includes the following embodiments.
  • Metal nanowire (A) having an average diameter of 1 to 100 nm, an average long axis length of 1 to 100 ⁇ m, and an average aspect ratio of 100 to 2000, and at least one of ethyl cellulose and hydroxypropyl cellulose
  • a metal nanowires ink comprising: a binder resin (B) comprising: and a solvent (C) comprising diethylene glycol monoethyl ether, wherein the content of the metal nanowires (A) is 0.005 to 0.05% by mass,
  • a method for producing a conductive film comprising the steps of applying and drying on at least one side of a polymer film.
  • the mass ratio of the metal nanowire (A) to the binder resin (B) [metal nanowire (A) / binder resin (B)] is in the range of 0.01 to 0.5, [3] or [3] 4] conductive film.
  • Metal nanowire ink having an average diameter of 1 to 100 nm, an average long axis length of 1 to 100 ⁇ m, and an average aspect ratio of 100 to 2000, and at least one of ethyl cellulose and hydroxypropyl cellulose And a solvent (C) containing diethylene glycol monoethyl ether, and the content of the metal nanowire (A) is 0.005 to 0.05% by mass.
  • Metal nanowire ink having an average diameter of 1 to 100 nm, an average long axis length of 1 to 100 ⁇ m, and an average aspect ratio of 100
  • a conductive film having a small amount of metal nanowires and a surface resistance of 1000 to 10000 ⁇ / ⁇ , a conductive film with little in-plane variation, a method for producing the same, and metal nanowire ink used therefor are provided. You can do it.
  • the conductive film which concerns on embodiment of this invention can be used suitably for the conductive film use for a touch panel and electronic paper excellent in low cost and resistance value stability.
  • a conductive layer is formed on at least one side of a polymer film as a substrate, and the conductive layer has an average diameter of 1 to 100 nm and an average major axis length of 1 to 100 ⁇ m.
  • a metal nanowire (A) having an average aspect ratio of 100 to 2000, and a binder resin (B) containing at least one of ethyl cellulose and hydroxypropyl cellulose, and the surface resistivity of the conductive layer is 1,000. It is characterized in that it is ⁇ 10000 ⁇ / ⁇ , and the variation of the in-plane surface resistance value is 35% or less.
  • the polymer film is not particularly limited as long as it has sufficient adhesion to the conductive layer.
  • a film made of a polymer such as polyester (polyethylene terephthalate (PET), polyethylene naphthalate (PEN), etc.), polycarbonate, acrylic resin, polycycloolefin, polysulfone, polyamide, polyimide, etc. is suitably used. I can do things.
  • PET polyethylene terephthalate
  • PEN polyethylene naphthalate
  • polycarbonate acrylic resin
  • acrylic resin polycycloolefin
  • polysulfone polyamide
  • polyimide polyimide
  • a conductive film having excellent transparency can be obtained. It can.
  • the preferred polymer film is a film made of any of polycycloolefin, polyester (polyethylene terephthalate (PET), polyethylene naphthalate (PEN), etc.), and a film made of polycycloolefin, polyethylene terephthalate (PET) Is more preferred.
  • the thickness of the polymer film is not particularly limited and may be appropriately selected depending on the application and type, but is usually 25 to 500 ⁇ m, more preferably 38 to 400 ⁇ m from the viewpoint of mechanical strength, handling property, etc. More preferably, it is 50 to 300 ⁇ m.
  • various additives may be added to the polymer film, for example, antioxidants, heat stabilizers, weather stabilizers, ultraviolet absorbers, organic lubricants, pigments, dyes, organic or inorganic fine particles, fillers, nucleating agents, etc. It may be added to an extent that does not deteriorate the characteristics.
  • the polymer film may be used as it is without surface treatment.
  • the polymer film may be subjected to surface treatment such as corona treatment or plasma treatment.
  • the conductive layer is obtained by applying and drying a metal nanowire ink on at least one surface of a polymer film.
  • the metal nanowires ink comprises metal nanowires (A), a binder resin (B), and a solvent (C).
  • the conductive layer is a conductive layer in which metal nanowires (A) are dispersed in a binder resin (B), the surface resistance value is 1000 to 10000 ⁇ / ⁇ , and the variation of the surface resistance value is 35% or less
  • the conductive layer is formed on at least one side of the polymer film to constitute the conductive film of the present embodiment.
  • the content of the metal nanowires (A) in the conductive layer is preferably 0.5 to 1.5%, preferably 1.0 to 1.4% in terms of the occupied area ratio of the metal nanowires (A) to the conductive film. Is more preferred.
  • the occupied area ratio of the metal nanowires to the conductive film is 0.5% or more, a conductive film having a surface resistance value of 10000 ⁇ / ⁇ or less can be obtained.
  • the occupied area ratio of the metal nanowires to the conductive film at 1.5% or less, it is possible to obtain a conductive film having a high total light transmittance, a low haze, and excellent transparency.
  • the “occupied area ratio of the metal nanowires to the conductive film” means the ratio of the projected area of the metal nanowires observed from the direction perpendicular to the plane of the conductive layer of the conductive film.
  • Metal nanowire (A)> The metal nanowire is a metal having a diameter of nanometer order size, and is a conductive material having a wire-like or tube-like shape.
  • wire-like and tube-like are both linear, but the former is intended not to be hollow in the center and the latter to be hollow in the center.
  • the properties may be flexible or rigid.
  • the former is referred to as "metal nanowire in a narrow sense” and the latter is referred to as "metal nanotube in a narrow sense”.
  • metal nanowire (A)” is used to encompass metal nanowires in a narrow sense and metal nanotubes in a narrow sense.
  • the narrow sense metal nanowires and the narrow sense metal nanotubes may be used alone or in combination.
  • the average diameter (diameter) of the metal nanowires (A) is 1 to 100 nm, preferably 5 to 80 nm, more preferably 10 to 60 nm, and still more preferably 10 to 50 nm.
  • the average length of the major axes of the metal nanowires is 1 to 100 ⁇ m, preferably 1 to 50 ⁇ m, more preferably 2 to 50 ⁇ m, and still more preferably 5 to 30 ⁇ m.
  • the metal nanowire (A) has an average diameter thickness and an average long axis length satisfying the above range, and an average aspect ratio of 100 to 2000, preferably 200 to 1000, and 300 to 300 It is more preferably 1000, and still more preferably 300 to 700.
  • the aspect ratio is a value obtained by a / b when the average diameter of the diameter of the metal nanowire is b and the average length of the major axis is a.
  • a and b can be measured using a scanning electron microscope (SEM).
  • Optimal embodiments include silver nanowires.
  • a well-known manufacturing method can be used as a manufacturing method of metal nanowire (A).
  • silver nanowires in a narrow sense
  • silver nanowires can be synthesized by reducing silver nitrate in the presence of polyvinyl pyrrolidone using the polyol (Poly-ol) method (see Chem. Mater., 2002, 14, 4736).
  • Gold nanowires in a narrow sense
  • WO 2008/073143 and WO 2008/046058 provide a detailed description of large scale synthesis and purification techniques of silver nanowires and gold nanowires.
  • Gold nanotubes (in a narrow sense) having a porous structure can be synthesized by reducing a chloroauric acid solution using silver nanowires as a template.
  • the silver nanowires used as the template are dissolved in the solution by the redox reaction with chloroauric acid, and as a result, gold nanotubes having a porous structure can be formed (J. Am. Chem. Soc., 2004, 126, 3892 -3901).
  • the binder resin (B) used for the metal nanowire ink disperses and immobilizes the metal nanowire (A) in the conductive layer, and contains at least one of ethyl cellulose and hydroxypropyl cellulose.
  • the metal nanowires (A) can be uniformly dispersed in the binder resin (B), and uniformly dispersed and immobilized on the polymer film.
  • transparency and the like can be provided.
  • a resin other than ethylcellulose and hydroxypropylcellulose can be used in combination as long as it dissolves in the solvent (C) described later, but the compounding amount thereof is 50 mass of the whole binder resin (B)
  • the content is preferably less than%, more preferably less than 30% by mass, and still more preferably less than 20% by mass.
  • the mass ratio of the metal nanowires (A) to the binder resin (B) in the metal nanowires ink is preferably in the range of 0.01 to 0.5, and more preferably Is from 0.03 to 0.4, more preferably from 0.05 to 0.2.
  • the conductivity of the metal nanowire (A) can be sufficiently expressed by setting the mass ratio of the metal nanowire (A) to the binder resin (B) to 0.01 or more.
  • the solvent (C) contained in the metal nanowires ink needs to have a composition capable of dissolving the binder resin (B), dispersing the metal nanowires (A), and capable of being favorably applied to the surface of the polymer film. Therefore, the solvent contains diethylene glycol monoethyl ether.
  • the amount of solvent used is not particularly limited as long as it can provide a uniform conductive layer when the metal nanowires ink is applied on the polymer film. In this case, the amount of the solvent is adjusted so that the total amount of the metal nanowires (A) and the binder resin (B) contained in the metal nanowires ink is about 0.1 to 0.5% by mass with respect to the entire metal nanowires ink. It is preferable to adjust the
  • the solvent (C) preferably contains an alcohol other than diethylene glycol monoethyl ether. It is also preferable to use a mixed solvent with water.
  • alcohols other than diethylene glycol monoethyl ether include methanol, ethanol, propanol, propylene glycol, propylene glycol monomethyl ether and the like, and one or more of these can be used in combination.
  • diethylene glycol monoethyl ether is preferably contained in the range of 10 to 50% by mass in all solvents.
  • the preferred range of alcohol in the total solvent is 90 to 100% by weight, and the preferred range of water is 0 to 10% by weight.
  • the metal nanowires ink may contain additives such as a surfactant, an antioxidant, and a filler as long as the performance such as printing characteristics, conductivity and optical characteristics is not adversely affected. Fillers such as fumed silica can be used to adjust the viscosity of the composition. The total amount of these components is preferably 5% by mass or less.
  • the metal nanowires (A), the binder resin (B), the solvent (C), and the additive that can be added as needed are added in the above-mentioned mixing ratio (% by mass). It mix
  • the viscosity of the metal nanowires ink is preferably 1 to 50 mPa ⁇ s.
  • the conductive film of the embodiment is obtained by applying a metal nanowire ink to the surface of the polymer film.
  • the content of the metal nanowires (A) in the metal nanowires ink is 0.005 to 0.05% by mass. If the amount is less than 0.005% by mass, the conductivity is too low, the sheet resistance can not be measured by the measurement method described in the examples described later, and if it exceeds 0.05% by mass, the conductivity is too high. Preferably, it is 0.01 to 0.05% by mass, more preferably 0.02 to 0.04% by mass.
  • the metal nanowire ink can be applied to the polymer film by any known method such as a bar coating method, a reverse coating method, a gravure coating method, a die coating method, and a blade coating method. Moreover, drying can be performed by arbitrary systems, such as a hot blast furnace and a far-infrared furnace.
  • the conductive film is a conductive film formed on a polymer film, and has a surface resistance value of 1000 to 10000 ⁇ / ⁇ , and a surface It is possible to obtain a conductive film having a variation in resistance of 35% or less.
  • the conductive film of the present embodiment is manufactured using a metal nanowire ink in which metal nanowires are well dispersed, containing a small amount of metal nanowires (A), a specific binder resin (B), and a solvent (C). Accordingly, a conductive film having a total light transmittance of 80% or more, preferably 85% or more, and a haze value of 0.1 to 1.5%, preferably 0.3 to 1.0% can be obtained. By setting the total light transmittance to 80% or more and the haze value to 0.1 to 1.5%, it is possible to obtain a conductive film having excellent transparency and less clouding.
  • the shape (length and diameter) of silver nanowires is the diameter and length of 50 nanowires arbitrarily selected using Hitachi High-Technologies Corporation high-resolution field-emission scanning electron microscope SU8020 (acceleration voltage 3 to 10 kV) Were observed and their arithmetic mean value was determined. Specifically, several drops of silver nanowire dispersion were dropped onto a silicon wafer, and after drying, the shape of the silver nanowire deposited on the silicon wafer was observed by the above-mentioned scanning electron microscope. The aspect ratio (average) was calculated from [average value of length of major axis of nanowire] / [average diameter of nanowire].
  • this ratio is preferably in the range of 0.1 to 0.5, and the smaller the ratio, the smaller the number of spherical particles generated at the time of silver nanowire synthesis. When spherical particles do not exist, it becomes about 0.1.
  • the surface resistance value and the variation is a resistance value up to 5000 ⁇ / ⁇ , using a non-contact resistance measuring instrument EC-80P manufactured by Napson Co., Ltd., and a resistance value of 5000 ⁇ / ⁇ or more, manufactured by Mitsubishi Chemical Analytic Co., Ltd. It was determined by the following method using a 4-probe contact type resistance measuring device Loresta-GP.
  • a sheet sample of 210 mm ⁇ 300 mm in size is divided into a total of 70 areas of 7 rows ⁇ 10 columns of 30 mm ⁇ 30 mm, and the surface resistance value near the center of the hatched area in FIG.
  • the average value of 12 points was taken as the surface resistance value. In this case, if the surface resistance value can not be measured even at one point, that is, there is non-conduction (1 ⁇ 10 7 ⁇ / ⁇ or more), the surface resistance value is not calculated.
  • ⁇ Synthesis of silver nanowires 100 g of propylene glycol (manufactured by Wako Pure Chemical Industries, Ltd.) is weighed in a 200 mL glass container, 2.3 g (13 mmol) of silver nitrate (manufactured by Toyo Kagaku Kogyo) is added as a metal salt, and the silver nitrate solution is stirred at room temperature for 2 hours Prepared.
  • this silver nitrate solution is referred to as a second solution.
  • the silver nitrate solution (second solution) prepared above is added to the dropping funnel, and the above first solution is maintained at a temperature of 150 ° C., so that the average supply mole number of silver nitrate is 0.087 mmol / min.
  • Silver nanowire was synthesize
  • the molar ratio calculated from the number of moles of the ionic derivative and the average number of moles of silver nitrate supplied is 0.22.
  • the silver ion concentration in the first solution was measured during the reaction, the molar ratio of the ionic derivative to the metal salt (metal salt / ionic derivative) was in the range of 0.2 to 6.7. After completion of the dropwise addition, heating and stirring were continued for 1 hour to complete the reaction.
  • the silver ion concentration was measured by an ammonium thiocyanate titration method using an automatic titration apparatus AUT-301 manufactured by Toa DKK.
  • reaction mixture (reaction solution) containing the synthetic silver nanowires is diluted 5 times with methanol (manufactured by Wako Pure Chemical Industries, Ltd.), and centrifugal force is applied for 5 minutes at a rotational speed of 6000 rpm using a centrifuge.
  • the silver nanowires were allowed to settle.
  • the operation of adding methanol and treating at 6000 rpm for 5 minutes was further repeated twice to wash and remove the PVP and the solvent remaining in the system.
  • the diameter and length of the obtained silver nanowires were determined from images of ultra-high resolution field emission scanning electron microscope SU8020 (acceleration voltage: 3 to 10 kV) manufactured by Hitachi High-Technologies Corp. by the above method.
  • the length was 20.5 ⁇ m.
  • the aspect ratio is 560.
  • Example 1 As a binder resin, a cellulose ETHOCEL TM STD100CPS (Dow Chemical Company, Standard 100 Industrial Ethylcellulose) was used.
  • the viscosity of the obtained silver nanowire ink was measured at 25 ° C. using a Brookfield digital viscometer DV-E (spindle: SC4-18).
  • ⁇ Silver content> A sample liquid containing silver nanowires in a dispersed state is collected from the obtained silver nanowire ink, nitric acid is added to the liquid to dissolve the silver nanowires, and atomic absorption spectrophotometer (apparatus: furnace made by Agilent Technologies, Inc. The amount of silver was measured by atomic absorption spectrophotometer AA280Z). As a result, the silver content was 0.02% by mass, and the same value as the targeted 0.02% by mass was obtained. Therefore, in Table 1, the silver content is shown by the nominal value (target value) (the same in each of the following examples).
  • a coating machine 70F0 manufactured by Imoto Manufacturing Co., Ltd. using a bar coater with a wet film thickness of about 20 ⁇ m, at a coating speed of 100 mm / sec, a PET film as a polymer film substrate It was applied to the surface.
  • a PET film a 125 ⁇ m thick film of Cosmo Shine (registered trademark) A4100 manufactured by Toyobo Co., Ltd. was used.
  • the surface of the PET film is an untreated surface. Then, it was dried at 130 ° C. for 10 minutes with a blower drier (ETAC HS 350 manufactured by Kushimoto Chemical Co., Ltd.) to form a transparent conductive film having a transparent conductive layer.
  • a blower drier (ETAC HS 350 manufactured by Kushimoto Chemical Co., Ltd.)
  • the characteristic evaluation results of the obtained conductive film are shown in Table 1 together with the composition of the metal nanowires ink used.
  • the occupied area ratio of the silver nanowires of the obtained conductive film was 1.02%.
  • the average surface resistance was 2668 ⁇ / ⁇ , and the variation in the surface resistance was as small as 27.7%, confirming that the conductive film had a substantially uniform conductivity.
  • the total light transmittance was as high as 90%, the haze was as low as 0.4%, and the transparency was extremely excellent.
  • Examples 2-6 The conductive film was obtained like Example 1 except having prepared and used the silver nanowire ink which made the compounding quantity of silver nanowire, binder resin, and the solvent as Table 1. Hydroxypropylcellulose 1000 to 5000 cP and hydroxypropyl cellulose 150 to 400 cP used in Examples 3 to 6 in Table 1 are manufactured by Wako Pure Chemical Industries, Ltd.
  • the occupied area ratio of silver nanowires is in the range of 1.0 to 1.4%, and the average surface resistance value is in the range of 2500 to 4000 ⁇ / ⁇ .
  • the total light transmittance was as high as 90%, the haze was as low as 0.4%, and the transparency was extremely excellent.
  • Comparative Example 1 The difference from Example 2 is that the solvent diethylene glycol monoethyl ether was changed to ethanol, and the amount of binder resin was changed from 0.2 parts by mass to 0.4 parts by mass. The same procedure as in Example 2 was followed except for this point.
  • the results are shown in Table 1.
  • the occupied area ratio of silver nanowires of the obtained conductive film was 1.47%.
  • the average surface resistance was 4367 ⁇ / ⁇ , and the variation in the surface resistance was as high as 36.7%, confirming that the film was a conductive film.
  • the haze was very high at 2.8% and the transparency was not excellent.
  • Example 2 The difference from Example 2 is that the solvent propylene glycol monomethyl ether (manufactured by Wako Pure Chemical Industries, Ltd.) and diethylene glycol monoethyl ether were changed to ethanol. The same procedure as in Example 2 was followed except for this point.
  • the results are shown in Table 1.
  • the occupied area rate of silver nanowires of the obtained conductive film was 1.49%. It was confirmed that the average surface resistance value is 1689 ⁇ / ⁇ , and the variation of the surface resistance value is as high as 57.2%, which is a conductive film. In addition, it was confirmed that the haze was as high as 4.3% and the transparency was not excellent.
  • Example 3 The difference from Example 3 is that the solvent diethylene glycol monoethyl ether was changed to ethanol. The same procedure as in Example 3 was followed except for this point.
  • Example 4 The difference from Example 4 is that the solvent diethylene glycol monoethyl ether was changed to diethylene glycol monobutyl ether (manufactured by Wako Pure Chemical Industries, Ltd.). The same procedure as in Example 4 was followed except for this point.
  • Comparative Example 5 The difference from Example 1 is that the silver concentration was changed from 0.02 to 0.04, and the binder resin was changed to poly-N-vinylacetamide (manufactured by Showa Denko KK). The same procedure as in Example 1 was followed except for this point.
  • Comparative Example 6 The difference from Example 1 is that the binder resin is changed to methylcellulose 4000 (manufactured by Wako Pure Chemical Industries, Ltd.). The same procedure as in Example 1 was followed except for this point.
  • Comparative Example 7 The difference from Example 1 is that the binder resin is changed to cellulose acetate (manufactured by Wako Pure Chemical Industries, Ltd.). The same procedure as in Example 1 was followed except for this point.
  • Comparative Example 8 The difference from Example 1 is that the binder resin is changed to cellulose triacetate (manufactured by Wako Pure Chemical Industries, Ltd.). The same procedure as in Example 1 was followed except for this point.
  • Comparative Example 9 The difference from Example 1 is that the binder resin was changed to hydroxypropyl methylcellulose (manufactured by Wako Pure Chemical Industries, Ltd.). The same procedure as in Example 1 was followed except for this point.
  • Comparative Example 10 The difference from Example 1 is that the binder resin is changed to hydroxyethyl cellulose (manufactured by Wako Pure Chemical Industries, Ltd.). The same procedure as in Example 1 was followed except for this point.
  • Comparative Example 11 The difference from Example 1 is that the binder resin was changed to sodium carboxymethylcellulose (manufactured by Wako Pure Chemical Industries, Ltd.). The same procedure as in Example 1 was followed except for this point.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Non-Insulated Conductors (AREA)
  • Conductive Materials (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)

Abstract

Le problème décrit par la présente invention est de fournir un film conducteur pour lequel la quantité d'un nanofil métallique à utiliser peut être réduite, et qui a une résistivité de surface allant de 1000 à 10000 Ω/□, et a un faible degré de variation dans des résistivités de surface dans le plan. L'invention concerne également : un procédé approprié pour la production d'un film conducteur, qui a un excellent rendement de production; et une encre à nanofils métalliques qui peut être utilisée pour le procédé. La solution selon l'invention porte sur un film conducteur qui peut être produit par un procédé de production comprenant une étape d'application d'une encre à nanofils métalliques sur au moins une surface d'un film polymère et ensuite le séchage de l'encre à nanofils métalliques, l'encre à nanofils métalliques contenant un nanofil métallique (A) ayant un diamètre moyen de 1 à 100 nm, une longueur moyenne d'axe long de 1 à 100 µm et un rapport d'aspect moyen de 100 à 2000, une résine liante (B) contenant au moins l'une de la cellulose d'éthyle et de la cellulose d'hydroxypropyle et un solvant (C) contenant de l'éther monoéthylique de diéthylène glycol, la teneur du nanofil métallique (A) dans l'encre de nanofil métallique étant de 0,005 à 0,05 % en masse, la résistivité de surface d'une couche conductrice dans le film conducteur est de 1000 à 10000 Ω/□, et le degré de variation de la résistivité de surface dans le plan est d'au maximum 35 %.
PCT/JP2018/028412 2017-08-02 2018-07-30 Procédé de production d'un film conducteur, film conducteur et encre à nanofils métalliques Ceased WO2019026829A1 (fr)

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CN201880038335.9A CN110720129B (zh) 2017-08-02 2018-07-30 导电膜的制造方法、导电膜和金属纳米线墨
KR1020197036305A KR102393615B1 (ko) 2017-08-02 2018-07-30 도전 필름의 제조 방법, 도전 필름, 및 금속 나노 와이어 잉크
JP2019534490A JP7300991B2 (ja) 2017-08-02 2018-07-30 導電フィルムの製造方法、導電フィルム及び金属ナノワイヤインク

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WO2020241842A1 (fr) * 2019-05-31 2020-12-03 昭和電工株式会社 Procédé de fabrication de film conducteur transparent
JP6855648B1 (ja) * 2019-12-27 2021-04-07 昭和電工株式会社 透明導電フィルムの製造方法
WO2021131099A1 (fr) * 2019-12-27 2021-07-01 昭和電工株式会社 Procédé de fabrication de film conducteur transparent

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Publication number Priority date Publication date Assignee Title
WO2020241842A1 (fr) * 2019-05-31 2020-12-03 昭和電工株式会社 Procédé de fabrication de film conducteur transparent
JP6855647B1 (ja) * 2019-05-31 2021-04-07 昭和電工株式会社 透明導電フィルムの製造方法
US11535047B2 (en) 2019-05-31 2022-12-27 Showa Denko K.K. Method for producing transparent conducting film
JP6855648B1 (ja) * 2019-12-27 2021-04-07 昭和電工株式会社 透明導電フィルムの製造方法
WO2021131099A1 (fr) * 2019-12-27 2021-07-01 昭和電工株式会社 Procédé de fabrication de film conducteur transparent
KR20210084478A (ko) * 2019-12-27 2021-07-07 쇼와 덴코 가부시키가이샤 투명 도전 필름의 제조 방법
KR102316141B1 (ko) 2019-12-27 2021-10-22 쇼와 덴코 가부시키가이샤 투명 도전 필름의 제조 방법
TWI749570B (zh) * 2019-12-27 2021-12-11 日商昭和電工股份有限公司 透明導電膜之製造方法
US11538603B2 (en) 2019-12-27 2022-12-27 Showa Denko K.K. Method for producing transparent conducting film

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JPWO2019026829A1 (ja) 2020-06-18
KR20200006998A (ko) 2020-01-21
KR102393615B1 (ko) 2022-05-03
TW201920508A (zh) 2019-06-01
JP7300991B2 (ja) 2023-06-30
CN110720129B (zh) 2022-06-03

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