CN114806280A - Conductive ink, transparent conductive film and preparation method thereof - Google Patents
Conductive ink, transparent conductive film and preparation method thereof Download PDFInfo
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- CN114806280A CN114806280A CN202110120436.4A CN202110120436A CN114806280A CN 114806280 A CN114806280 A CN 114806280A CN 202110120436 A CN202110120436 A CN 202110120436A CN 114806280 A CN114806280 A CN 114806280A
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- conductive ink
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/52—Electrically conductive inks
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- 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
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- 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
Abstract
The invention provides conductive ink, a transparent conductive film and a preparation method thereof. The conductive ink comprises an infrared absorbent, a conductive film layer is formed by the conductive ink, and the infrared absorbent tends to the lap joint of the metal nanowires in the drying process of the conductive film layer; when the conductive film layer is baked by an infrared lamp, the infrared absorbent rapidly absorbs energy of infrared rays and converts the energy into heat, so that the lap joint of the metal nanowires becomes a local hot spot, and the purpose of welding the metal wires is achieved. Because the infrared absorbent can absorb infrared rays and convert the infrared rays into heat more quickly, the energy of the infrared rays can be more effectively utilized, and therefore, the energy consumption cost of the infrared lamp can be reduced.
Description
Technical Field
The invention relates to the technical field of transparent conductive electrodes, in particular to conductive ink for reducing electric resistance of a transparent conductive film, the transparent conductive film and a preparation method thereof.
Background
As is well known, for a long time, ITO (indium tin oxide) has been used as a mainstream material for touch control because of its conductive, transparent, and stable properties. However, with the increasing demand for touch functions of foldable and large-sized products (such as foldable mobile phones, meeting white boards, etc.), the times have put new demands on the touch industry: large size, flexibility, folding and cost performance. The traditional ITO material process has higher cost; the flexible panel is fragile and has poor flexibility, which is not beneficial to manufacturing the flexible panel; the resistance value is high, and the touch panel is not suitable for manufacturing medium and large size touch panels; poor light transmittance and the like. The requirements of people on the touch control products of the new generation are difficult to meet. To solve these problems, new materials must be found to be replaced.
The metal grid and the nano silver wire are relatively mature in technology, and various indexes such as flexibility, conductivity, permeability, cost, stability and the like are outstanding. Whether the technology development or the market application comprehensive evaluation is adopted, the method is two major roles of the emerging touch technology in the near future, and is expected to be widely varied in the emerging large-size and flexible touch fields. The nano silver wire is nano-scale and is produced by adopting a direct coating mode, and the process is simpler. However, the conductive silver wire is a conductive network formed by mutually lapping, so that the lapping problem is bound to exist, cellulose is generally used as a main lapping auxiliary agent and a film-forming auxiliary agent in the market at present, but only lapping is carried out, lapping is not good, and the impedance of the lapping part is high. Ideally, the silver wire and the silver wire are welded into a whole at the intersection, so that the electrical signal of the silver wire is optimized.
In the process of preparing the transparent conductive electrode, the processes of wet film coating of ink, solvent evaporation and lap joint between silver wires are involved; in the drying process, an infrared lamp is generally adopted to provide heat so as to be beneficial to the evaporation of the solvent, and meanwhile, the heat provides energy required by the welding between the silver wires. The high temperature is beneficial to the evaporation of the solvent and the welding between the silver wires, but the energy consumption cost is increased; and too high a temperature may cause the wire to develop relegated instability, thereby losing conductivity at breakage.
In view of the above, it is desirable to provide a conductive ink, a transparent conductive film and a method for preparing the same, so as to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a conductive ink for reducing transparent conductive film side rental, a transparent conductive film and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a conductive ink comprises metal nanowires and an infrared absorber, wherein the infrared absorber has an absorption effect on infrared light.
Further, the infrared absorber is a nanoparticle with a heavy metal.
Further, the nanoparticles are selected from a mixture of any one or more of: WO 2.72 Cesium tungsten bronze, sodium tungsten bronze, potassium tungsten bronze, a solid solution of alkali metal tungsten bronze, antimony-doped tin dioxide, indium antimony oxide, indium tin oxide, LaB6, copper phosphate nanopowder, iron phosphate.
Further, the conductive ink comprises metal nanowires, an infrared absorber, a viscosity regulator, a surface energy regulator, a dispersant and a solvent.
Further, the conductive ink includes: 0.01 to 10 percent of metal nano-wire; 0.001% -1% of infrared absorbent; 0.01 to 10 percent of viscosity regulator; 1 ppm-1000 ppm of surface energy regulator; 0.01 to 5 percent of dispersant; solvent and the balance.
Further, the metal nanowire is a silver nanowire, a gold nanowire or a copper nanowire; and/or the viscosity regulator is selected from at least one of hydroxyethyl cellulose and hydroxypropyl cellulose; and/or the surface energy regulator is a fluorine-containing nonionic surfactant; and/or the dispersant is at least one selected from PVP, K17, K25, K30, K60 and K90; and/or the solvent is one or more of water, ethanol, isopropanol and propylene glycol monomethyl ether.
Further, the conductive ink also comprises an element anti-counterfeiting marker, wherein the element anti-counterfeiting marker is an element with an atomic number larger than 39 and a composition thereof.
Further, the element anti-counterfeiting marker is a W or La series element.
Further, the metal nanowire is a silver nanowire, a gold nanowire or a copper nanowire.
A preparation method of a transparent conductive film comprises the following steps:
forming a conductive film layer by using the conductive ink;
and baking the conductive film layer by adopting an infrared lamp so that the lap joint parts of the metal nanowires are welded into a whole.
The conductive film is prepared by the preparation method of the transparent conductive film.
And a new method is developed, an infrared absorbent is added into an ink formula, the infrared absorbent tends to the lap joint of the metal nanowires in the drying process, then infrared absorbent particles are heated up to heat the lap joint of the silver wires under the irradiation of an infrared lamp, and efficient silver wire welding is realized through the adjustment of the process. In addition, because of the characteristics of the silver wire and the resin, the conductive film generally has a yellowish color, which may affect the appearance of the nano silver conductive film to some extent. At present, the problem that the film material is yellow, namely B is higher is solved, and the color is neutralized mainly by adding blue pigment or dye into the film material. The infrared welding agent GTO water dispersion slurry mainly used by us shows blue color, and basically corresponds to the effect of adding blue pigment or dye, and can help to reduce the whole B of the film material.
The beneficial effects of the invention are: the conductive ink comprises an infrared absorbent, a conductive film layer is formed by the conductive ink, and the infrared absorbent tends to the lap joint of the metal nanowires in the drying process of the conductive film layer; when the conductive film layer is baked by an infrared lamp, the infrared absorbent rapidly absorbs energy of infrared rays and converts the energy into heat, so that the lap joint of the metal nanowires becomes a local hot spot, the purpose of welding the metal wires is achieved, and the sheet resistance of the conductive film is reduced. Because the infrared absorbent can absorb infrared rays and convert the infrared rays into heat more quickly, the energy of the infrared rays can be more effectively utilized, and therefore, the energy consumption cost of the infrared lamp can be reduced.
Drawings
Fig. 1 is a schematic view of a method for manufacturing a transparent conductive film according to a preferred embodiment of the invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.
A conductive ink comprises metal nanowires and an infrared absorber, wherein the infrared absorber has an absorption effect on infrared light.
According to the invention, the infrared absorbent is added into the conductive ink, after the conductive ink forms the conductive film layer, the solvent flows in the drying process of the conductive film layer, and the infrared absorbent makes Brownian motion in the solvent, tends to the lap joint of the metal nanowires along with the drying of the solvent, and is agglomerated at the lap joint; when the conductive film layer is baked by an infrared lamp, the infrared absorbent rapidly absorbs energy of infrared rays and converts the energy into heat, and the temperature of other areas is relatively low, so that the lap joint of the metal nanowires becomes a local hot spot, the purpose of welding the metal wires is achieved, and the sheet resistance of the conductive film is reduced. Because the infrared absorbent can absorb infrared rays and convert the infrared rays into heat more quickly, the energy of the infrared rays can be more effectively utilized, and therefore, the energy consumption cost of the infrared lamp can be reduced.
In addition, because of the characteristics of the silver wire and the resin, the conductive film generally has a yellowish color, which may affect the appearance of the nano silver conductive film to some extent. In the invention, the infrared absorbent has the property of transmitting visible light (400-600 nm) and absorbing infrared light (900-2500 nm), and the water dispersion slurry of the infrared absorbent (GTO) mainly prepared by mixing tungsten, vanadium, tin and antimony oxides according to a proportion has blue color, so that the conductive ink is added with blue pigment or dye to help to reduce the whole B of the conductive film and reduce the yellowness of the transparent conductive film formed by the conductive ink.
Further, the infrared absorber is a nanoparticle with a heavy metal.
For example, the nanoparticles are selected from WO 2.72 Cesium tungsten bronzes (e.g. CsxWO) 3 ) Sodium tungsten bronze
(NaxWO 3 ) Potassium tungsten bronze (KWO) 3 ) At least one of solid solution of alkali metal tungsten bronze, antimony doped tin dioxide (ATO), Indium Antimony Oxide (IAO), Indium Tin Oxide (ITO), lanthanum hexaboride (LaB6), copper phosphate nano powder and iron phosphate.
The inventor finds that: the transparent conductive film materials appearing in the current market have the same functions and extremely similar structures. For the company, after the product is distributed to the market, if a quality problem occurs, whether the product is the product of the company cannot be accurately determined.
Furthermore, the conductive ink also comprises element anti-counterfeiting markers which are uniformly distributed in the whole conductive film, and the element anti-counterfeiting markers can be traced in a very good mode and can be used for tracing exclusive anti-counterfeiting markers.
The element anti-counterfeiting marker is an element with an atomic number larger than 39 and a composition thereof, and can be easily detected by tracking through radioactivity of the element. Preferably, the element anti-counterfeiting marker is a W or La element, and can be tracked and absorb infrared rays.
In a specific embodiment, the conductive ink comprises metal nanowires, an infrared absorber, a viscosity modifier, a surface energy modifier, a dispersant and a solvent.
Further, the conductive ink includes:
0.01 to 10 percent of metal nano-wire;
infrared absorbent, 0.001-1% viscosity regulator, 0.01-10%;
1 ppm-1000 ppm of surface energy regulator;
0.01 to 5 percent of dispersant;
solvent and the balance.
Wherein the viscosity regulator is at least one selected from hydroxyethyl cellulose and hydroxypropyl cellulose; and/or the surface energy regulator is fluorine-containing nonionic surfactant such as FS-3100, FS-30 and the like; the dispersing agent is at least one selected from PVP, K17, K25, K30, K60 and K90; the solvent is one or the combination of more of water, ethanol, isopropanol and propylene glycol monomethyl ether.
Further, the metal nanowire includes, but is not limited to, a silver nanowire, a gold nanowire, or a copper nanowire.
As shown in fig. 1, the present invention also provides a method for preparing a transparent conductive film, comprising the steps of:
forming a conductive film layer by using any one of the conductive inks;
and (2) baking the conductive film layer by using an infrared lamp, wherein in the drying process of the conductive film layer, the infrared absorbent tends to the lap joint of the metal nanowires, under the irradiation of the infrared lamp, infrared absorbent particles are heated to heat the lap joint of the silver wires, and efficient silver wire welding is realized through the adjustment of the process.
The transparent conductive film prepared by the preparation method has the transmittance of more than 90 percent; the sheet resistance is less than 800ohs/sqr, the haze is less than 10%, the electrical property and the optical property are excellent, and the conductive electrode with excellent transparency can be manufactured.
The invention develops a new method, the infrared absorbent is added into the ink formula, the infrared absorbent tends to the lap joint of the metal nano wire in the drying process, then the infrared absorbent particles are heated up to heat the lap joint of the silver wire under the irradiation of an infrared lamp, and the efficient silver wire welding is realized through the adjustment of the process, thereby reducing the sheet resistance of the conductive film.
In addition, because of the characteristics of the silver wire and the resin, the conductive film generally has a yellowish color, which may affect the appearance of the nano silver conductive film to some extent. At present, the problem that the film material is yellow, namely B is higher is solved, and the color is neutralized mainly by adding blue pigment or dye into the film material. The infrared welding agent GTO water dispersion slurry mainly used by us shows blue color, which is basically equivalent to the effect of adding blue pigment or dye, and can help to reduce the whole B of the film material and reduce the yellowness of the transparent conductive film formed by the conductive ink.
In summary, the conductive ink of the present invention includes the infrared absorbent, and the infrared absorbent is located at the overlapping position of the metal nanowires during the drying process of the conductive film layer formed by the conductive ink; when the conductive film layer is baked by an infrared lamp, the infrared absorbent rapidly absorbs energy of infrared rays and converts the energy into heat, so that the lap joint of the metal nanowires becomes a local hot spot, and the purpose of welding the metal wires is achieved. Because the infrared absorbent can absorb infrared rays and convert the infrared rays into heat more quickly, the energy of the infrared rays can be more effectively utilized, and therefore, the energy consumption cost of the infrared lamp can be reduced.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. The conductive ink is characterized by comprising metal nanowires and an infrared absorber, wherein the infrared absorber has an absorption effect on infrared light.
2. The conductive ink of claim 1, wherein: the infrared absorber is a nanoparticle with a heavy metal.
3. The conductive ink of claim 2, wherein: the nanoparticles are selected from a mixture of any one or more of: WO 2.72 Cesium tungsten bronze, sodium tungsten bronze, potassium tungsten bronze, solid solutions of alkali metal tungsten bronze, antimony-doped tin dioxide, indium antimony oxide, indium tin oxide, LaB6, copper phosphate nanopowderBody, iron phosphate.
4. The conductive ink of claim 1, wherein: the conductive ink comprises metal nanowires, an infrared absorber, a viscosity regulator, a surface energy regulator, a dispersing agent and a solvent.
5. The conductive ink of claim 4, wherein: the conductive ink includes:
0.01 to 10 percent of metal nano-wire;
0.001% -1% of infrared absorbent;
0.01 to 10 percent of viscosity regulator;
1 ppm-1000 ppm of surface energy regulator;
0.01 to 5 percent of dispersant;
solvent and the balance.
6. The conductive ink of claim 4, wherein:
the metal nano-wire is a silver nano-wire, a gold nano-wire or a copper nano-wire;
and/or the viscosity regulator is selected from at least one of hydroxyethyl cellulose and hydroxypropyl cellulose;
and/or the surface energy regulator is a fluorine-containing nonionic surfactant;
and/or the dispersant is at least one selected from PVP, K17, K25, K30, K60 and K90;
and/or the solvent is one or more of water, ethanol, isopropanol and propylene glycol monomethyl ether.
7. The conductive ink of claim 1, wherein: the conductive ink also comprises an element anti-counterfeiting marker, wherein the element anti-counterfeiting marker is an element with an atomic number larger than 39 and a composition thereof.
8. The conductive ink of claim 7, wherein: the element anti-counterfeiting marker is a W or La series element.
9. A method for preparing a transparent conductive film is characterized by comprising the following steps: the method comprises the following steps:
forming a conductive film layer using the conductive ink according to any one of claims 1 to 8;
and baking the conductive film layer by adopting an infrared lamp so that the lap joint parts of the metal nanowires are welded into a whole.
10. A conductive film produced by the method for producing a transparent conductive film according to claim 9.
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| CN202110120436.4A CN114806280A (en) | 2021-01-28 | 2021-01-28 | Conductive ink, transparent conductive film and preparation method thereof |
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| CN202110120436.4A CN114806280A (en) | 2021-01-28 | 2021-01-28 | Conductive ink, transparent conductive film and preparation method thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102527621A (en) * | 2011-12-27 | 2012-07-04 | 浙江科创新材料科技有限公司 | Preparation method for haze-adjustable flexible transparent conductive film |
| CN102965049A (en) * | 2007-11-05 | 2013-03-13 | 巴斯夫欧洲公司 | Tungsten oxides used to increase the heat-input amount of near infrared radiation |
| CN105143366A (en) * | 2013-04-10 | 2015-12-09 | 迪睿合电子材料有限公司 | Ink composition for forming transparent conductive film, transparent conductive film, method for producing transparent electrode, and image display device |
| CN105493203A (en) * | 2013-08-22 | 2016-04-13 | 昭和电工株式会社 | Transparent electrode and method for producing same |
| CN105702381A (en) * | 2016-01-11 | 2016-06-22 | 合肥微晶材料科技有限公司 | Packaging and manufacturing method of highly stable silver nano-wire composite film |
| CN108428494A (en) * | 2018-02-27 | 2018-08-21 | 合肥微晶材料科技有限公司 | A method of high-performance nano silver wire transparent conductive film is prepared by microwave joining |
| CN110083279A (en) * | 2019-05-07 | 2019-08-02 | 业成科技（成都）有限公司 | Transparent conductive material, touch-control structure and touch device |
-
2021
- 2021-01-28 CN CN202110120436.4A patent/CN114806280A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102965049A (en) * | 2007-11-05 | 2013-03-13 | 巴斯夫欧洲公司 | Tungsten oxides used to increase the heat-input amount of near infrared radiation |
| CN102527621A (en) * | 2011-12-27 | 2012-07-04 | 浙江科创新材料科技有限公司 | Preparation method for haze-adjustable flexible transparent conductive film |
| CN105143366A (en) * | 2013-04-10 | 2015-12-09 | 迪睿合电子材料有限公司 | Ink composition for forming transparent conductive film, transparent conductive film, method for producing transparent electrode, and image display device |
| CN105493203A (en) * | 2013-08-22 | 2016-04-13 | 昭和电工株式会社 | Transparent electrode and method for producing same |
| CN105702381A (en) * | 2016-01-11 | 2016-06-22 | 合肥微晶材料科技有限公司 | Packaging and manufacturing method of highly stable silver nano-wire composite film |
| CN108428494A (en) * | 2018-02-27 | 2018-08-21 | 合肥微晶材料科技有限公司 | A method of high-performance nano silver wire transparent conductive film is prepared by microwave joining |
| CN110083279A (en) * | 2019-05-07 | 2019-08-02 | 业成科技（成都）有限公司 | Transparent conductive material, touch-control structure and touch device |
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