WO2014204265A1

WO2014204265A1 - Conductive ink composition, transparent conductive film including same, and method of manufacturing transparent conductive film

Info

Publication number: WO2014204265A1
Application number: PCT/KR2014/005466
Authority: WO
Inventors: 이인숙; 이용정; 한미경
Original assignee: 주식회사 잉크테크
Priority date: 2013-06-20
Filing date: 2014-06-20
Publication date: 2014-12-24
Also published as: KR102169003B1; KR20140147975A

Abstract

The present invention relates to a conductive ink composition, a transparent conductive film including same, and a method of manufacturing a transparent conductive film. The conductive ink composition includes a conductive nano material and a solvent. The solvent is characterized in that it comprises between 80% and 100% by weight of water and between 0% and 20% by weight of a co-solvent.

Description

Conductive ink composition, transparent conductive film and method for manufacturing transparent conductive film comprising same

The present invention relates to a conductive ink composition, a transparent conductive film including the same, and a method for manufacturing the transparent conductive film, and more particularly, to modify the composition of the solvent of the conductive ink composition to control bubble generation to improve optical and electrical properties. It relates to a conductive ink composition, a transparent conductive film comprising the same, and a method for producing a transparent conductive film.

Recently, the transparent conductive film has been used as an essential component of electrical and electronic equipment such as transparent electrodes in various display fields such as power supply of display devices, electromagnetic shielding films of home appliances, LCDs, OLEDs, FEDs, PDPs, flexible displays, and electronic paper.

Transparent conductive films currently in use include inorganic oxide conductive materials such as indium tin oxide (ITO), antimony tin oxide (ATO), and antimony zinc oxide (AZO). I use it.

In particular, the conductive paste or the conductive nano ink technology in the electronic industry has been in the spotlight recently in terms of productivity, cost reduction, and environment due to the enlargement of the display industry and the simplification of the process.

Such conductive nano inks require uniform particle size and excellent dispersibility, and metal nano particles of uniform particle size used in the metal nano ink are mostly made by a chemical method that is dispersed and synthesized in a solution.

Such a conductive metal nano ink must consider a boiling point for fractional distillation, and depending on the type of solvent, it can greatly affect the physical properties of the conductive film, thereby limiting solvent selection.

Conventional oil-based metal inks have the advantages of smaller nanoparticle size, easier manufacturing of high concentration, and continuous ejection from the head during inkjet printing process, compared to water-based metal inks. Due to the uneven line width, surface treatment is essential and has a high firing temperature.

Korean Patent Publication No. 2008-0102098 solves this problem by selecting an ink additive soluble in a lipophilic solvent and optimizing the composition of the metal ink to increase the adhesive strength with the substrate and prevent cracks when forming the wiring by inkjet printing. As a non-aqueous metal ink composition which hardens well at low temperature, the technique which disperse | distributed metal nanoparticle to non-aqueous cosolvent with an additive is proposed.

However, such a metal ink composition also has a problem of inferior dispersion due to complex process procedures and generation of waste water as well as reaggregation of metal nanoparticles.

Therefore, there is a need to develop a conductive ink composition having improved physical properties such as electrical properties and optical properties when applied to the conductive film while improving dispersion.

Accordingly, an object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a conductive ink composition for a display that can control the generation of bubbles by adjusting the composition of a solvent.

In addition, it is an object of the present invention to provide a conductive ink composition that can improve the physical properties of the display implemented by reducing the generation of foreign matter by controlling the content of the material constituting the solvent.

In addition, it is an object to provide a conductive ink composition having excellent dispersibility of the conductive material by adjusting the conductive material, solvent and additives constituting the conductive ink composition.

In addition, it is an object to provide an environmentally friendly and economical conductive ink composition by adjusting the composition of the solvent.

In order to achieve the above object, the conductive ink composition according to an embodiment of the present invention comprises a conductive nanomaterial and a solvent, the solvent is made up of more than 80% and less than 100% by weight of water and more than 20% by weight of cosolvent 0 It is characterized by.

The conductive nanomaterial is at least one of a metal nanowire, a metal nanorod or a metal nanostructure of a metal nanoparticle, a conductive polymer, a conductive fiber, or a carbon nanotube.

The cosolvent is methanol, ethanol, isopropanol, 1-methoxypropanol, butanol, ethylhexyl alcohol, terpineol, ethylene glycol, glycerin, ethyl acetate, butyl acetate, methoxypropyl acetate, carbitol acetate, ethyl carbitol acetate , Methyl cellosolve, butyl cellosolve, diethyl ether, tetrahydrofuran, dioxane, methyl ethyl ketone, acetone, dimethylformamide, 1-methyl-2-pyrrolidone, hexane, heptane, dodecane, paraffin It is characterized in that at least one of oil, mineral spirit, benzene, toluene, xylene, chloroform, methylene chloride, carbon tetrachloride, acetonitrile or dimethyl sulfoxide.

The conductive nano material is 0.01 to 10 parts by weight based on 100 parts by weight of the solvent.

The conductive ink composition further comprises a binder, a dispersant and a wetting agent, the binder is 0.01 to 1 part by weight, the dispersant is 0.001 to 0.5 parts by weight, the wetting agent is 0.0001 to 1 part by weight It features.

The conductive ink composition is characterized in that it further comprises a surfactant, leveling agent, thixotropic agent or reducing agent.

In order to achieve the above object, the conductive ink composition according to another embodiment of the present invention comprises a conductive nanomaterial and a solvent, the solvent is characterized in that the water.

In order to achieve the above object, the transparent conductive film according to an embodiment of the present invention comprises a conductive nanomaterial and a solvent, the solvent is conductive consisting of more than 80% less than 100% by weight of water and more than 20% by weight of cosolvent 0 It is characterized by including an ink composition.

In order to achieve the above object, a method of manufacturing a transparent conductive film according to an embodiment of the present invention, the coating step of coating a conductive ink composition comprising a conductive nanomaterial and a solvent on a substrate; And a drying step of drying the conductive ink composition, wherein the solvent is 80 to less than 100 wt% of water and more than 0 to 20 wt% of cosolvent.

The metal nanowires have an average thickness of 10 to 200 nm and an average length of 1 to 100 μm.

In order to achieve the above object, a method of manufacturing a transparent conductive film according to an embodiment of the present invention is a coating step of coating a conductive ink composition comprising a solvent consisting of a conductive nanomaterial and water on the substrate; And a drying step of drying the conductive ink composition.

By adjusting the composition of the solvent constituting the conductive ink composition with cosolvents such as water and alcohols, it is possible to control bubbles that may occur in the coating process using the conductive ink composition without addition of an antifoaming agent.

Conductive ink composition capable of realizing transparent conductive film for display with excellent optical and electrical properties by improving the electrical uniformity by controlling the content of water and cosolvent, which are the constituents of the solvent, to prevent the occurrence of foreign substances recondensing the conductive material. Can be provided.

In addition, it is possible to provide a conductive ink composition capable of realizing a transparent conductive film for a display having improved physical properties by controlling the type and content of the conductive material, the solvent and the additive to improve the dispersibility of the conductive material.

In addition, unlike conventional methods using an organic solvent as a solvent, it is not only environmentally friendly by replacing most of the components of the solvent with water, but also less affected by the volatilization of the organic solvent can be used in the coating process regardless of opening or sealing of the space. There is a merit that it is not greatly restricted by space.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a flowchart sequentially illustrating a method of manufacturing a conductive film using the conductive ink composition according to the present invention.

FIG. 2 is a graph showing uniformity of electrical characteristics of the transparent conductive film of Example 2. FIG.

3 is a graph showing the uniformity of the electrical properties of the transparent conductive film of Example 4.

4 is an optical microscope photograph of the transparent conductive films of Examples 1 (a), 2 (b) and 4 (c).

5 is a before (a) and after (b) photograph for explaining the defoaming effect of the conductive ink composition prepared in Example 2. FIG.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and the general knowledge in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the present invention with respect to a conductive ink composition, a conductive film comprising the same and a method for producing a conductive film according to the present invention will be described in detail. The invention can be better understood by the following examples, which are intended for the purpose of illustration of the invention and are not intended to limit the scope of protection defined by the appended claims.

The conductive ink composition according to an embodiment of the present invention includes a conductive nanomaterial and a solvent, and the solvent is preferably an aqueous solvent composed of water and co-solvent.

The conductive nanomaterial is preferably at least one of a metal nanowire, a metal nanorod or a metal nanostructure of a metal nanoparticle, a conductive polymer, a conductive fiber, or a carbon nanotube, more preferably, the metal nanostructure is effective. More preferably, the metal nanowire is most effective.

Metal, which is the main material of nanowires, is basically an opaque material or a nano unit, and shows a transparency when its size decreases, and when it decreases below a certain size in the increase of the specific resistance of the metal in the conductive portion, a rapid increase in the specific resistance may occur. Therefore, the metal nanowires may have an average thickness of 10 to 200 nm and an average length of 1 to 100 μm.

Metals of the metal nanostructures are Ag, Au, Cu, Ni, Co, Pd, Ti, V, Mn, Fe, Cr, Zr, Nb, Mo, W, Ru, Cd, Ta, Re, Os, Ir, Al, Various kinds of metals known in the art, such as Ga, Ge, In, Sn, Sb, Pb, and Bi, may be used, and two or more of these may be alloyed.

Typical metal nanoparticle manufacturing methods include a physical method of physically pulverizing a metal mass and a method of manufacturing using a chemical reaction. In more detail, the chemical method is described by aerosol method for the injection of high-pressure gas to powder, pyrolysis method for pyrolysis using metal compound and gas reducing agent, heat evaporation of evaporation material to produce powder Evaporative condensation, sol-gel, hydrothermal synthesis, ultrasonic synthesis, microemulsion, liquid phase reduction, and the like.

The liquid phase reduction method using a dispersing agent and a reducing agent, which is considered to be easy to control the formation of nanoparticles and is considered to be the most economical, is most used. However, in the present invention, any method can be used as long as it can form nanoparticles.

Detailed description of the method for producing the nanoparticles by the liquid-phase reduction method is described in Korean Patent Application No. 2006-0074246 filed by the present applicant and the metal nanoparticles described in the patent application has the advantage that the particle size is uniform and the cohesion is minimized In this case, the conductive ink containing the metal nanoparticles has an advantage of easily forming a uniform and dense thin film or fine pattern having high conductivity even when fired at a low temperature of 150 ° C. or less for a short time.

In particular, a preferred embodiment of the present invention is a conductive nano material, it is effective to use a silver nanowire that is relatively excellent in conductivity, inexpensive and capable of mass production.

In the case of silver nanowires, silver nanowires may be manufactured using a polyol reduction method in which silver nitrate and polyvinylpyrrolidone are mainly dissolved in an organic solvent such as ethylene glycol and heated and stirred to reduce them. no.

The solvent may be composed of water 80 or more and less than 100% by weight and cosolvent more than 0 and 20 or less by weight, more preferably it is effective that the cosolvent comprises 1 to 10% by weight of the solvent.

The solvent of the conductive ink composition has a higher water content than the conventional one, and has an excellent effect of suppressing the generation of bubbles in the coating process for preparing the conductive film by adding a small amount of cosolvent.

When the content of the cosolvent, the organic solvent, exceeds 20% by weight, the organic solvent is volatilized during the coating process to change the concentration and viscosity of the conductive ink composition, thereby changing the composition of the ink composition. As the metal reaggregates and the resistance locally changes, the electrical uniformity is different, thereby significantly reducing the physical properties of the conductive film.

Accordingly, the conductive ink composition including a solvent having a composition in the above range prevents reaggregation of the conductive nanomaterial through bubble generation control, thereby uniformly distributing the conductive nanomaterial throughout the conductive film, thereby improving electrical and optical properties. .

In addition, the use of harmful organic solvents are reduced due to the reduced content of cosolvent is environmentally friendly.

The cosolvent is methanol, ethanol, isopropanol, 1-methoxypropanol, butanol, ethylhexyl alcohol, terpineol, ethylene glycol, glycerin, ethyl acetate, butyl acetate, methoxypropyl acetate, carbitol acetate, ethyl carbitol acetate , Methyl cellosolve, butyl cellosolve, diethyl ether, tetrahydrofuran, dioxane, methyl ethyl ketone, acetone, dimethylformamide, 1-methyl-2-pyrrolidone, hexane, heptane, dodecane, paraffin It is preferable to use oil, mineral spirit, benzene, toluene, xylene, chloroform, methylene chloride, carbon tetrachloride, acetonitrile or dimethyl sulfoxide, more preferably methanol, ethanol and n-propyl alcohol are used for defoaming action. More effective.

Depending on the conductive nanomaterial, two or more of the above-described cosolvents may be mixed and used.

The composition of the solvent can remove bubbles without adding an antifoaming agent.

The conductive ink composition may further include a binder, a dispersing agent, and a wetting agent.

It is preferable that the binder has excellent adhesion to various substrates.

Examples of the binder include acrylic resins such as polyacrylic acid or polyacrylic acid esters, cellulose resins such as ethyl cellulose, aliphatic or copolyester resins, vinyl resins such as polyvinyl butyral and polyvinylacetate, polyurethane resins, and polyethers. And thermosetting resins such as urea resins, alkyd resins, silicone resins, fluorine resins, olefin resins such as polyethylene, thermoplastic resins such as petroleum and rosin resins, epoxy resins, unsaturated polyester resins, phenol resins, melamine resins, and the like. Acrylic resins of various structures such as resins, ultraviolet rays or electron beam curing types, ethylene-propylene rubbers, styrene-butadiene rubbers, and the like can also be used.

As the dispersant, an organic compound such as polycarboxylic acid or a derivative thereof may be mainly used. Examples of polycarboxylic acids and derivatives thereof include homopolymers and copolymers of acrylates and methacrylates such as alkali metal salts of acrylic acid and methacrylic acid, methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, homopolymers and copolymers of acrylic or methacrylic acid esters such as n-butyl acrylate, n-butyl methacrylate, isobutyl acrylate or isobutyl methacrylate, but are not limited thereto.

Examples of the humectant include compounds such as polyethylene glycol, Sufinol series of Air Products, and Tego wet series of Deguessa.

The binder is preferably 0.01 to 1 parts by weight, the dispersant is 0.001 to 0.5 parts by weight, and the wetting agent is 0.0001 to 1 part by weight based on 100 parts by weight of the solvent.

By improving the dispersibility of the solvent using water and cosolvent, it is possible to implement a transparent conductive film having excellent physical properties even if the amount of the additive is reduced to the content in the above range.

In addition, the conductive ink composition may further include a surfactant, a leveling agent, a thixotropic agent, or a reducing agent.

Examples of the surfactant include anionic surfactants such as sodium lauryl sulfate, nonyl phenoxypolyethoxyethanol, and BB such as Dupont's FFS. Anionic surfactants and cationic surfactants such as laurylbenzylammonium chloride and amphoteric surfactants such as lauryl betaine and coco betaine may be mentioned.

As the leveling agent or thixotropic agent, the BYK series of BYK company, the glide series of Degussa, the EFKA 3000 series of EFKA company or the DS of Cognis company For example, the DSX series.

The reducing agent may be added to facilitate firing, for example, hydrazine, acetichydrazide, sodium or potassium borohydride, trisodium citrate, and amine compounds such as methyldiethanolamine, dimethylamineborane, Ferrous chloride, metal salts such as ferric lactate, aldehyde compounds such as hydrogen, hydrogen iodide, carbon monoxide, formaldehyde, acetaldehyde, glucose, ascorbic acid, salicylic acid, tannic acid, pyrogallol, hydroquinone Organic compounds, such as these, etc. are mentioned.

The conductive ink composition according to another embodiment of the present invention includes a conductive nanomaterial and a solvent, and the solvent may be water, which completely replaces the solvent of the conductive ink composition with water.

By completely replacing the solvent of the conductive ink composition with water, it is possible to control the reaggregation of the conductive nanomaterials to maintain the dispersion of the dispersed conductive nanomaterials as it is, and to solve the problem of locally changing electric resistance even after the coating process. Can contribute.

The conductive nanomaterial is preferably 0.01 to 10 parts by weight, more preferably 1 to 8 parts by weight based on 100 parts by weight of a solvent made of water. If the conductive nanomaterial is less than 0.01 parts by weight, it is difficult to secure the electrical conductivity for implementing the display. If the conductive nano material is more than 10 parts by weight, it may affect the permeability of the conductive film.

The transparent conductive film according to one embodiment of the present invention may include the conductive ink composition.

The conductive nanomaterial is preferably at least one of a metal nanowire, a metal nanorod or a metal nanostructure of a metal nanoparticle, a conductive polymer, a conductive fiber, or a carbon nanotube, but is not necessarily limited thereto.

It comprises a conductive nanomaterial and a solvent, the solvent is preferably made of water 80 to less than 100% by weight and cosolvent 0 to 20% by weight, it may be made of water only.

When the solvent is included, the cosolvent is methanol, ethanol, isopropanol, 1-methoxypropanol, butanol, ethylhexyl alcohol, terpineol, ethylene glycol, glycerin, ethyl acetate, butyl acetate, methoxypropyl acetate, carbitol Acetate, ethyl carbitol acetate, methyl cellosolve, butyl cellosolve, diethyl ether, tetrahydrofuran, dioxane, methyl ethyl ketone, acetone, dimethylformamide, 1-methyl-2-pyrrolidone, hexane, It is preferably at least one of heptane, dodecane, paraffin oil, mineral spirit, benzene, toluene, xylene, chloroform, methylene chloride, carbon tetrachloride, acetonitrile or dimethyl sulfoxide.

The method of manufacturing a transparent conductive film according to an embodiment of the present invention may include a coating step (S10) and a drying step (S20).

The coating step S10 is a step of coating a conductive ink composition on a substrate, which is a process of forming a sensing unit of the display.

The kind of said base material is not specifically limited. The substrate may be formed of a transparent material such as a plastic film or glass. The plastic film may be polyimide (PI), polyethylene terephthalate (PET), polyethernaphthalate (PEN), polyethersulfone (PES), nylon (Nylon), polytetrafluoroethylene (PTFE), polyether ether Ketones (PEEK), polycarbonates (PC) or polyarylates (PAR) can be used.

The substrate may be provided with an opaque material. For example, a metal plate having an insulated surface may be used, or an opaque plastic film, an opaque glass, or an opaque glass fiber material may be applied. Thus, a plastic film, a glass substrate, etc. can be used, It is not limited to this.

The conductive ink composition includes a conductive nanomaterial and a solvent, and the solvent may be composed of water of 80% or more and less than 100% by weight and cosolvent 0% and 20% or less by weight.

The conductive nanomaterial may be at least one of a metal nanowire, a metal nanorod or a metal nanostructure of a metal nanoparticle, a conductive polymer, a conductive fiber, or a carbon nanotube.

When the conductive nanomaterial is a metal nanowire in the metal nanostructure, the average thickness of the metal nanowire is preferably 10 to 200 nm, and the average length is 1 to 100 μm.

The cosolvent is methanol, ethanol, isopropanol, 1-methoxypropanol, butanol, ethylhexyl alcohol, terpineol, ethylene glycol, glycerin, ethyl acetate, butyl acetate, methoxypropyl acetate, carbitol acetate, ethyl carbitol acetate , Methyl cellosolve, butyl cellosolve, diethyl ether, tetrahydrofuran, dioxane, methyl ethyl ketone, acetone, dimethylformamide, 1-methyl-2-pyrrolidone, hexane, heptane, dodecane, paraffin Oil, mineral spirit, benzene, toluene, xylene, chloroform, methylene chloride, carbon tetrachloride, acetonitrile or dimethyl sulfoxide.

Conductive ink compositions include inkjet method, flat screen method, spin coating method, bar coater method, roll coating method, flow coating method, doctor blade, disc It can be applied on the substrate using any known coating method of dispensing, gravure printing or flexography printing without limitation.

At this time, the number of coating can be used repeatedly one or more times. Since the coating properties may be different according to the respective coating methods, it is necessary to optimize the rheology of the conductive ink composition to the coating method.

The coating thickness is preferably 10 μm or less, more preferably 0.1 μm or more and 5 μm or less, and thickness adjustment is necessary according to the line width, required resistance, and post-treatment conditions to be implemented.

In the method of manufacturing a transparent conductive film according to another embodiment of the present invention, a conductive layer may be formed using a conductive ink composition including a solvent made of water and a conductive nanomaterial by increasing the content of water in a solvent.

In this case, the conductive nano material is preferably 0.01 to 10 parts by weight based on 100 parts by weight of the solvent, and the conductive nano material is a metal nanostructure of a metal nanowire, a metal nanorod or a metal nanoparticle, a conductive polymer, or a conductive fiber. Or at least one of carbon nanotubes.

Hereinafter, the superiority of the present invention and the present invention through the examples and comparative examples will be described in detail. The scope of the invention is not limited to the examples.

Example 1

After adding 0.15 wt% of silver nanowire solids to 99.8389 wt% of distilled water (18 MΩ), 0.001 wt% of a dispersant, 0.0001 wt% of a wetting agent, and 0.01 wt% of a binder were added thereto, followed by stirring for 30 minutes to prepare a conductive ink composition. The conductive ink composition prepared above was applied to the surface of the non-conductive base film, and dried by heat treatment at a temperature of 120 ° C. for 3 minutes to prepare a transparent conductive film.

Example 2

0.15 wt% of silver nanowire solids was added to a solution containing 9.84 wt% of methanol and 89.9989 wt% of distilled water (18 MΩ), followed by addition of 0.001 wt% of a dispersant, 0.0001 wt% of a wetting agent, and 0.01 wt% of a binder, followed by stirring for 30 minutes. A conductive ink composition was prepared. The conductive ink composition prepared above was applied to the surface of the non-conductive base film, and dried by heat treatment at a temperature of 120 ° C. for 3 minutes to prepare a transparent conductive film.

Example 3

0.15 wt% of silver nanowire solids were added to a solution containing 19.9678 wt% of methanol and 79.8711 wt% of distilled water (18 MΩ), and then 0.001 wt% of a dispersant, 0.0001 wt% of a wetting agent, and 0.01 wt% of a binder were added thereto, followed by stirring for 30 minutes. A conductive ink composition was prepared. The conductive ink composition prepared above was applied to the surface of the non-conductive base film, and dried by heat treatment at a temperature of 120 ° C. for 3 minutes to prepare a transparent conductive film.

Example 4

0.15 wt% of silver nanowire solids was added to a solution containing 9.84 wt% of normal propyl alcohol and 89.9989 wt% of distilled water (18 MΩ), followed by adding 0.001 wt% of a dispersant, 0.0001 wt% of a wetting agent, and 0.01 wt% of a binder. Agitated to prepare a conductive ink composition. The conductive ink composition prepared above was applied to the surface of the non-conductive base film, and dried by heat treatment at a temperature of 120 ° C. for 3 minutes to prepare a transparent conductive film.

Example 5

0.15 wt% of silver nanowire solids was added to a solution containing 19.9678 wt% of normal propyl alcohol and 79.8711 wt% of distilled water (18 MΩ), followed by adding 0.001 wt% of a dispersant, 0.0001 wt% of a wetting agent, and 0.01 wt% of a binder. Agitated to prepare a conductive ink composition. The conductive ink composition prepared above was applied to the surface of the non-conductive base film, and dried by heat treatment at a temperature of 120 ° C. for 3 minutes to prepare a transparent conductive film.

Example 6

0.15 wt% of silver nanowire solids was added to a solution containing 9.84 wt% of ethanol and 89.9989 wt% of distilled water (18 MΩ), followed by addition of 0.001 wt% of a dispersant, 0.0001 wt% of a wetting agent, and 0.01 wt% of a binder, followed by stirring for 30 minutes. A conductive ink composition was prepared. The conductive ink composition prepared above was applied to the surface of the non-conductive base film, and dried by heat treatment at a temperature of 120 ° C. for 3 minutes to prepare a transparent conductive film.

Example 7

0.15 wt% of silver nanowire solids was added to a solution containing 19.9678 wt% of ethanol and 79.8711 wt% of distilled water (18 MΩ), followed by addition of 0.001 wt% of a dispersant, 0.0001 wt% of a wetting agent, and 0.01 wt% of a binder, followed by stirring for 30 minutes. A conductive ink composition was prepared. The conductive ink composition prepared above was applied to the surface of the non-conductive base film, and dried by heat treatment at a temperature of 120 ° C. for 3 minutes to prepare a transparent conductive film.

Example 8

0.15 wt% of silver nanowire solids was added to a solution containing 9.84 wt% of methyl cellosolve and 89.9989 wt% of distilled water (18 MΩ), followed by adding 0.001 wt% of dispersant, 0.0001 wt% of wetting agent, and 0.01 wt% of binder. Stirring for minutes gave a conductive ink composition. The conductive ink composition prepared above was applied to the surface of the non-conductive base film, and dried by heat treatment at a temperature of 120 ° C. for 3 minutes to prepare a transparent conductive film.

Comparative Example 1

0.15 wt% of silver nanowire solids was added to a solution containing 29.951 wt% of ethanol and 69.8879 wt% of distilled water (18 MΩ), followed by adding 0.001 wt% of a dispersant, 0.0001 wt% of a wetting agent, and 0.01 wt% of a binder, followed by stirring for 30 minutes. A conductive ink composition was prepared. The conductive ink composition prepared above was applied to the surface of the non-conductive base film, and dried by heat treatment at a temperature of 120 ° C. for 3 minutes to prepare a transparent conductive film.

Comparative Example 2

Comparative Example 3

0.15 wt% of silver nanowire solids was added to a solution containing 29.951 wt% of methyl cellosolve and 69.8879 wt% of distilled water (18 MΩ), followed by adding 0.001 wt% of a dispersant, 0.0001 wt% of a wetting agent, and 0.01 wt% of a binder. Stirring for minutes gave a conductive ink composition. The conductive ink composition prepared above was applied to the surface of the non-conductive base film, and dried by heat treatment at a temperature of 120 ° C. for 3 minutes to prepare a transparent conductive film.

Comparative Example 4

Table 1 shows the average sheet resistance, standard deviation of sheet resistance, transmittance, and haze of the transparent conductive films prepared from the conductive ink compositions of Examples 1 to 8 and Comparative Examples 1 to 4, respectively.

Table 1

	Average sheet resistance (Ω / □)	Sheet Resistance Standard Deviation	Permeability (%)	Haze (%)
Example 1	48	12	89.4	2.5
Example 2	48	5	89.4	2.7
Example 3	61	27	90.7	2.7
Example 4	42	8	88.9	2.6
Example 5	44	11	89.3	2.6
Example 6	50	6	89.3	2.6
Example 7	64	31	90.8	2.8
Example 8	146	23	89.6	2.8
Comparative Example 1	96	41	90.3	2.1
Comparative Example 2	109	58	90.1	2.4
Comparative Example 3	80	13	90.4	1.9
Comparative Example 4	71	76	90.0	2.3

According to Table 1, the transparent conductive film of the embodiment has a lower average sheet resistance and a smaller sheet resistance standard deviation value than the comparative example, which means that the electrical properties of the conductive film are uniform, whereby the conductive ink composition of the embodiment of the present invention. The antifoaming effect was found to be effective.

In addition, all the conductive films of the examples were measured for transmittance and haze value suitable for use in a display.

When comparing Examples 2 and 3, Examples 4 and 5, and Examples 6 and 7, respectively, when the content of cosolvent, which is an organic solvent, was small, the sheet resistance standard deviation value was measured to be small. It can be seen that the characteristics can be improved.

In addition, in the case of Example 1 in which the solvent was replaced with water, it can be confirmed that the average sheet resistance and the sheet resistance standard deviation are superior to those of the comparative example.

2 is a graph showing the uniformity of the electrical properties of the transparent conductive film of Example 2, Figure 3 is a graph showing the uniformity of the electrical properties of the transparent conductive film of Example 4. As shown in Figures 2 and 3, the conductive films of Examples 2 and 4 can be confirmed that the standard deviation is measured uniformly.

4 is an optical microscope photograph of the transparent conductive films of Examples 1, 2, and 4. FIG. It was confirmed that the surfaces of the transparent conductive films of Examples 1, 2, and 4 were uniformly formed.

5 is a photograph before (a) and after (b) for explaining the defoaming effect of the conductive ink composition prepared in Example 2. FIG. As shown in the photograph of FIG. 5, it was observed that the conductive ink composition suppressed bubble generation as shown in (b) by mixing the solvent of the present invention.

The scope of the present invention is not limited to the above-described embodiment, but may be embodied in various forms of embodiments within the scope of the appended claims. Without departing from the gist of the present invention as claimed in the claims, any person having ordinary skill in the art to which the present invention pertains is considered to be within the scope of the claims described in the present invention to various extents which can be modified.

In the conductive ink composition according to the present invention, the solvent of the conductive ink composition may be modified to implement a transparent conductive film having improved physical properties of optical and electrical properties.

Claims

In the conductive ink composition,

Wherein the conductive ink composition comprises a conductive nanomaterial and a solvent, wherein the solvent is 80% or more and less than 100% by weight of water and cosolvent more than 0 and 20% or less by weight.
The method of claim 1,

The conductive nanomaterial is at least one of a metal nanowire, a metal nanorod or a metal nanostructure of a metal nanoparticle, a conductive polymer, a conductive fiber, or a carbon nanotube.
The method of claim 1,

The cosolvent is methanol, ethanol, isopropanol, 1-methoxypropanol, butanol, ethylhexyl alcohol, terpineol, ethylene glycol, glycerin, ethyl acetate, butyl acetate, methoxypropyl acetate, carbitol acetate, ethyl carbitol acetate , Methyl cellosolve, butyl cellosolve, diethyl ether, tetrahydrofuran, dioxane, methyl ethyl ketone, acetone, dimethylformamide, 1-methyl-2-pyrrolidone, hexane, heptane, dodecane, paraffin At least one of oil, mineral spirit, benzene, toluene, xylene, chloroform, methylene chloride, carbon tetrachloride, acetonitrile or dimethyl sulfoxide.
The method of claim 1,

The conductive nanomaterial is 0.01 to 10 parts by weight based on 100 parts by weight of the solvent.
The method of claim 1,

The conductive ink composition further includes a binder, a dispersant and a humectant, and the binder is 0.01 to 1 part by weight, the dispersant is 0.001 to 0.5 part by weight, and the wetting agent is 0.0001 to 1 part by weight based on 100 parts by weight of the solvent. Ink composition.
The method of claim 1,

The conductive ink composition further comprises a surfactant, a leveling agent, a thixotropic agent or a reducing agent.
In the conductive ink composition,

The conductive ink composition includes a conductive nanomaterial and a solvent, and the solvent is water.
The method of claim 7, wherein

The conductive nanomaterial is 0.01 to 10 parts by weight based on 100 parts by weight of the solvent.
A conductive conductive material comprising a conductive nanomaterial and a solvent, wherein the solvent comprises a conductive ink composition comprising at least 80% by weight of water and at least 20% by weight of cosolvent.
The method of claim 9,

The conductive nanomaterial is at least one of a metal nanowire, a metal nanorod or a metal nanostructure of a metal nanoparticle, a conductive polymer, a conductive fiber, or a carbon nanotube.
The method of claim 9,

The cosolvent is methanol, ethanol, isopropanol, 1-methoxypropanol, butanol, ethylhexyl alcohol, terpineol, ethylene glycol, glycerin, ethyl acetate, butyl acetate, methoxypropyl acetate, carbitol acetate, ethyl carbitol acetate , Methyl cellosolve, butyl cellosolve, diethyl ether, tetrahydrofuran, dioxane, methyl ethyl ketone, acetone, dimethylformamide, 1-methyl-2-pyrrolidone, hexane, heptane, dodecane, paraffin A transparent conductive film, which is at least one of oil, mineral spirit, benzene, toluene, xylene, chloroform, methylene chloride, carbon tetrachloride, acetonitrile or dimethyl sulfoxide.
Coating a conductive ink composition comprising a conductive nanomaterial and a solvent on the substrate; And

And drying the conductive ink composition.

The solvent is 80 to less than 100% by weight of water and cosolvent 0 to 20% by weight of the transparent conductive film production method.
The method of claim 12,

The conductive nanomaterial is at least one of a metal nanowire, a metal nanorod or a metal nanostructure of a metal nanoparticle, a conductive polymer, a conductive fiber, or carbon nanotubes.
The method of claim 13,

The metal nanowire has an average thickness of 10 to 200nm, the average length of 1 to 100㎛ manufacturing method of the transparent conductive film.
The method of claim 12,

The cosolvent is methanol, ethanol, isopropanol, 1-methoxypropanol, butanol, ethylhexyl alcohol, terpineol, ethylene glycol, glycerin, ethyl acetate, butyl acetate, methoxypropyl acetate, carbitol acetate, ethyl carbitol acetate , Methyl cellosolve, butyl cellosolve, diethyl ether, tetrahydrofuran, dioxane, methyl ethyl ketone, acetone, dimethylformamide, 1-methyl-2-pyrrolidone, hexane, heptane, dodecane, paraffin A method for producing a transparent conductive film which is at least one of oil, mineral spirit, benzene, toluene, xylene, chloroform, methylene chloride, carbon tetrachloride, acetonitrile or dimethyl sulfoxide.
Coating a conductive ink composition comprising a conductive nanomaterial and a solvent on the substrate; And

Method for producing a transparent conductive film comprising a drying step of drying the conductive ink composition.
The method of claim 16,

The conductive nanomaterial is 0.01 to 10 parts by weight based on 100 parts by weight of the solvent.
The method of claim 16,

The conductive nanomaterial is at least one of a metal nanowire, a metal nanorod or a metal nanostructure of a metal nanoparticle, a conductive polymer, a conductive fiber, or carbon nanotubes.