CN114806279A - 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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- CN114806279A CN114806279A CN202110120423.7A CN202110120423A CN114806279A CN 114806279 A CN114806279 A CN 114806279A CN 202110120423 A CN202110120423 A CN 202110120423A CN 114806279 A CN114806279 A CN 114806279A
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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
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
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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
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Abstract
The invention provides conductive ink, a transparent conductive film and a preparation method thereof. The conductive ink comprises the silver nanowires and the yellowness reducing agent, and yellow light emitted by the silver nanowires is absorbed by the yellowness reducing agent, so that the yellowness of a transparent conductive film formed by the conductive ink is reduced.
Description
Technical Field
The invention relates to the technical field of transparent conductive electrodes, in particular to conductive ink for reducing the yellowness of a nano silver wire transparent conductive film, the transparent conductive film and a preparation method thereof.
Background
The nano silver wire transparent conductive film is generally formed by mixing a nano silver wire, film-forming resin, a dispersing agent, a flatting agent, a defoaming agent and a solvent according to a certain mass ratio to form nano silver wire conductive ink, and forming a film on a substrate (such as optical glass, PET, PE, PP or PI) by using the ink through a coating process. Due to the small-size effect of the nano structure, the surface of the nano silver wire generates total reflection to form evanescent waves to enter the light hydrophobic medium, a certain plasma wave exists in the metal medium, the two waves meet to generate plasma resonance, energy is transferred from photons to surface plasma, most energy of ultraviolet incident light with the wavelength of 350 nm-420 nm is absorbed by the surface plasma wave, so that the energy of the projected light is rapidly reduced, the transparent conductive film of the nano silver wire displays yellow, and the color of an output image of the display is not consistent with the actual color.
The current methods for reducing yellowness are: the plasma resonance inhibitor is added to reduce the absorption of the silver wire to ultraviolet light so as to reduce the yellowness, and the added inhibitor needs to be directly added into ink and has more adding content, so that the reliability test of the conductive film can be adversely affected.
In view of the above, it is desirable to provide a novel conductive ink for reducing the yellowness of a silver nanowire transparent conductive film, a transparent conductive film and a method for preparing the same, so as to solve the above problems.
Disclosure of Invention
The invention aims to provide conductive ink for reducing the yellowness of a nano silver wire transparent conductive film, the 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 silver nanowires and a yellow-reducing agent, wherein the yellow-reducing agent has an absorption effect on yellow light.
Further, the conductive ink is formed by adding a yellowing reducing agent into a silver nanowire solution, wherein the mass ratio of the yellowing reducing agent to the silver nanowires is 1: 300-1: 75.
Further, the yellowness-reducing agent emits blue light and/or violet light.
Further, the yellowness-reducing agent is methyl violet or a derivative thereof.
A preparation method of a transparent conductive film is used for preparing the transparent conductive film by the conductive ink.
A preparation method of a transparent conductive film comprises the following steps:
sequentially coating the silver nanowire conductive ink and the yellow reducing ink of the yellow reducing agent which has an absorption effect on yellow light on a substrate to form a conductive film layer doped with the yellow reducing agent;
or sequentially coating the yellow reducing ink of the yellow reducing agent having the effect of absorbing yellow light and the silver nanowire conductive ink on the substrate to form a conductive film layer doped with the yellow reducing agent;
or coating the silver nanowire conductive ink on the first surface of the substrate to form a conductive film layer; and coating the yellowing ink of the yellowing agent with yellow absorption on the second surface of the substrate to form a yellowing layer.
Further, the mass ratio of the yellowing reducing agent to the silver nanowires is 1: 300-1: 75.
Further, the yellowness-reducing agent emits blue light and/or violet light.
Further, the yellowness-reducing agent is methyl violet or a derivative thereof.
A transparent conductive film is prepared by the preparation method of the transparent conductive film.
A transparent conductive film comprises a substrate, a conductive film layer and a cover plate, wherein the conductive film layer is positioned on the substrate, the cover plate is positioned on one side of the transparent conductive film, which is far away from the substrate, and the conductive film layer comprises silver nanowires and a yellow reducing agent which has an absorption effect on yellow light; or, the conductive film layer comprises silver nanowires, the transparent conductive film further comprises a yellowness reducing layer located on one side of the substrate or the cover plate, wherein the side of the one side of the substrate or the cover plate is far away from the conductive film layer, and the yellowness reducing layer comprises a yellowness reducing agent which has an absorption effect on yellow light.
Further, the mass ratio of the yellowing reducing agent to the silver nanowires is 1: 300-1: 75.
Further, the yellowness-reducing agent emits blue light and/or violet light.
Further, the yellowness-reducing agent is methyl violet or a derivative thereof.
The invention has the beneficial effects that: the conductive ink comprises the silver nanowires and the yellowness reducing agent, and yellow light emitted by the silver nanowires is absorbed by the yellowness reducing agent, so that the yellowness of a transparent conductive film formed by the conductive ink is reduced.
Drawings
Fig. 1 is an absorption spectrum of silver nanowires;
FIG. 2 is an absorption spectrum of methyl violet.
Detailed Description
The present invention will be described in detail with reference to the embodiments shown in the drawings, and fig. 1-2 show a preferred embodiment of the present invention.
The inventor finds out in research that, as shown in fig. 1, the silver nanowires absorb purple light and emit yellow light, so that particularly the formed conductive film has high yellowness.
The invention provides conductive ink for yellowness of a nano silver wire transparent conductive film, which comprises silver nanowires and a yellowness reducing agent, wherein the yellowness reducing agent has an absorption effect on yellow light. And absorbing yellow light emitted by the silver nanowires through the yellowness reducing agent to reduce the yellowness of the transparent conductive film formed by the conductive ink.
Furthermore, the yellow reducing agent is a material which has strong absorption on yellow light, so that the using amount of the yellow reducing agent can be reduced, and the influence on the conductivity, the appearance and the like of the original silver nanowire solution is not great.
The mass ratio of the yellowing reducing agent to the silver nanowire solution is 1: 300-1: 75, and a good effect of reducing yellow light can be obtained. If the amount of the yellowing agent is less than this ratio, the effect of reducing the yellowing is insignificant, and if the amount of the yellowing agent is greater than this ratio, appearance defects and a decrease in reliability of silver nanowires are easily caused.
Preferably, the yellowness-reducing agent emits blue light and/or violet light, so that the visible light absorption intensity of the transparent conductive film to yellow, blue and/or violet parts is kept consistent, thereby reducing the overall yellowness and reducing chromatic aberration.
The inventor further researches and discovers that referring to fig. 2, the methyl violet has strong absorption effect on yellow light of 577nm-597nm and emits blue-violet light.
In a preferred embodiment, the yellowness-reducing agent is methyl violet or a derivative thereof. Agent for reducing yellowing
Taking the methyl violet as an example, after the methyl violet is added, the silver nanowire solution turns purple, the purple deepens along with the increase of the adding amount of the methyl violet, and the color difference of the conductive ink and the especially prepared transparent conductive film is obviously changed, which refers to the following table.
The invention also discloses a preparation method of the transparent conductive film, which comprises the following steps: a transparent conductive film is prepared from any of the above conductive inks. The transparent conductive film obtained by the method keeps consistent absorption intensity of visible light of yellow and purple parts, thereby reducing the overall yellowness and reducing chromatic aberration.
The following will be described in detail by way of specific examples.
The clean container was placed on a level-adjusted balance and, after the reading stabilized, 9455g of deionized water and 54.5g of IPA were added, followed by 19.36g of hydroxypropyl methylcellulose. Stirring for 10min at 600rpm of a stirrer, adding 1118g of polyvinylpyrrolidone, 15g of nano silver wires, 0.125g of methyl violet and 1g of dispersing agent Capstone FS-3100, and stirring for 30min at 600rpm of the stirrer. And filtering the mixture by using a filter with the thickness of 10 mu m and a filter with the thickness of 5 mu m to obtain the conductive ink with the low yellowness value. And (3) coating the conductive ink on the surface of the PET by using a small roll-to-roll coater, and drying at 120 ℃ for 30s to prepare the low-yellowness conductive film.
Conductive ink without methyl violet was used as a control group, and conductive films were prepared in the same manner, and the performance of the two conductive films was tested as follows:
| production batch | Square resistance omega | Penetration% | Haze%) | B value |
| Control group | 28.6 | 89.41 | 2.36 | 2.139 |
| 1:120 | 28.5 | 89.59 | 2.11 | 1.611 |
The invention also provides another preparation method of the transparent conductive film, which separates and coats the silver nanowire conductive ink and the yellow reducing ink of the yellow reducing agent which has the effect of absorbing yellow light, does not influence the property and performance of the silver nanowire conductive ink, and can be suitable for more conductive inks.
In one embodiment, the method for preparing a transparent conductive film comprises the following steps: and sequentially coating the silver nanowire conductive ink and the yellow reducing ink of the yellow reducing agent with yellow light absorption on the substrate to form the conductive film layer doped with the yellow reducing agent. In the embodiment, the yellowing agent is adopted to perform surface coating on the transparent conductive film, so that the adjustment of the yellowing is realized.
In another embodiment, a method for preparing a transparent conductive film includes the steps of: and sequentially coating the yellow reducing ink of the yellow reducing agent which has an absorption effect on yellow light and the silver nanowire conductive ink on the substrate to form the conductive film layer doped with the yellow reducing agent. In the embodiment, the transparent conductive film is subjected to bottom coating by adopting the yellowing reducing agent, so that the adjustment of the yellowing is realized.
In another embodiment, a method for preparing a transparent conductive film includes the steps of: coating the silver nanowire conductive ink on the first surface of the substrate to form a conductive film layer; and coating the yellowing ink of the yellowing agent with yellow absorption on the second surface of the substrate to form a yellowing layer. In the embodiment, the transparent conductive film is back-coated by the yellowing reducing agent, so that the yellowing is adjusted and the transparent conductive film layer is not affected.
In the three embodiments, the mass ratio of the yellow-reducing agent to the silver nanowires is 1: 300-1: 75, so that a good yellow light reducing effect can be obtained. If the amount of the yellowing agent is less than this ratio, the effect of reducing the yellowing is insignificant, and if the amount of the yellowing agent is greater than this ratio, appearance defects and a decrease in reliability of silver nanowires are easily caused.
Preferably, the yellowness reducing agent emits blue light and/or purple light, and the protective layer plays a role in light compensation of the conductive film layer, so that the absorption intensity of the transparent conductive film on visible light of yellow, blue and/or purple parts is kept consistent, the overall yellowness is reduced, and chromatic aberration is reduced.
In one embodiment, methyl violet is used as the yellowness-reducing agent.
Preparation example of silver nanowire conductive ink: the clean container was placed on a level-adjusted balance and, after the reading stabilized, 9455g of deionized water and 54.5g of IPA were added, followed by 19.36g of hydroxypropyl methylcellulose. The mixture was stirred at 600rpm for 10min with a stirrer, and 1118g of polyvinylpyrrolidone, 15g of silver nanowires and 1g of dispersant Capstone FS-3100 were added thereto and stirred at 600rpm with a stirrer for 30 min. And then filtered once again using filters of 10 μm and 5 μm to obtain the conductive ink with low yellowness index. And (3) coating the conductive ink on the surface of the PET by using a small roll-to-roll coating machine, and drying at 120 ℃ for 30s to prepare the conductive layer.
Preparation example of a yellowness-reducing ink: the other clean container was placed on a level adjusted balance and after the readings stabilized 9455g of deionized water and 54.5g of IPA were added followed by 19.36g of hydroxypropyl methylcellulose. The mixture was stirred at 600rpm for 10min with a stirrer, and then 0.1g of methyl violet and 1g of dispersant, Capstone FS-3100, were added thereto and stirred at 600rpm with a stirrer for 30 min. Then filtering once by using a filter with the diameter of 10 mu m and a filter with the diameter of 5 mu m to prepare the yellow ink. And (3) coating the back of the PET coated with the nano silver wire conductive layer with the yellowing ink by using a small roll-to-roll coater, and drying at 120 ℃ for 30s to prepare the low-yellowing conductive film.
The invention also provides a transparent conductive film prepared by the preparation method of the transparent conductive film.
The invention also provides a transparent conductive film, which comprises a substrate, a conductive film layer positioned on the substrate and a cover plate positioned on one side of the transparent conductive film, which is far away from the substrate, wherein the conductive film layer comprises silver nanowires and a yellow-lowering agent which has an absorption effect on yellow light.
The invention also provides a transparent conductive film, which comprises a substrate, a conductive film layer positioned on the substrate, a cover plate positioned on one side of the transparent conductive film, which is far away from the substrate, and a yellowing reduction layer positioned on one side of the substrate or the cover plate, which is far away from the conductive film layer; the conductive film layer comprises silver nanowires, and the yellow-reducing layer comprises a yellow-reducing agent having an absorption effect on yellow light.
The mass ratio of the yellowing reducing agent to the silver nanowires is 1: 300-1: 75, so that a good effect of reducing yellow light can be achieved. If the amount of the yellowing agent is less than this ratio, the effect of reducing the yellowing is insignificant, and if the amount of the yellowing agent is greater than this ratio, appearance defects and a decrease in reliability of silver nanowires are easily caused.
Preferably, the yellowness reducing agent emits blue light and/or purple light, and the protective layer plays a role in light compensation of the conductive film layer, so that the absorption intensity of the transparent conductive film on visible light of yellow, blue and/or purple parts is kept consistent, the overall yellowness is reduced, and chromatic aberration is reduced.
In one embodiment, methyl violet is used as the yellowness-reducing agent.
In summary, the yellow degree of the transparent conductive film formed by the conductive ink is reduced by absorbing yellow light emitted by the silver nanowires through the yellow degree reducing agent.
It should be understood that although the specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it will be appreciated by those skilled in the art that the specification as a whole may be appropriately combined to form other embodiments as will be apparent to 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 (14)
1. The conductive ink is characterized by comprising silver nanowires and a yellow reducing agent, wherein the yellow reducing agent has an absorption effect on yellow light.
2. The conductive ink of claim 1, wherein: the conductive ink is formed by adding a yellowing reducing agent into a silver nanowire solution, wherein the mass ratio of the yellowing reducing agent to the silver nanowires is 1: 300-1: 75.
3. The conductive ink of claim 1, wherein: the yellowness-reducing agent emits blue light and/or violet light.
4. The conductive ink of claim 1, wherein: the yellowness reducing agent is methyl violet or a derivative thereof.
5. A method for preparing a transparent conductive film is characterized by comprising the following steps: a transparent conductive film prepared from the conductive ink according to any one of claims 1 to 4.
6. A method for preparing a transparent conductive film is characterized by comprising the following steps: the method comprises the following steps:
sequentially coating the silver nanowire conductive ink and the yellow reducing ink of the yellow reducing agent which has an absorption effect on yellow light on a substrate to form a conductive film layer doped with the yellow reducing agent;
or sequentially coating the yellow reducing ink of the yellow reducing agent having the effect of absorbing yellow light and the silver nanowire conductive ink on the substrate to form a conductive film layer doped with the yellow reducing agent;
or coating the silver nanowire conductive ink on the first surface of the substrate to form a conductive film layer; and coating the yellowing ink of the yellowing agent with yellow absorption on the second surface of the substrate to form a yellowing layer.
7. The method for producing a transparent conductive film according to claim 6, wherein: the mass ratio of the yellowing reducing agent to the silver nanowires is 1: 300-1: 75.
8. The method for producing a transparent conductive film according to claim 6, wherein: the yellowness-reducing agent emits blue light and/or violet light.
9. The method for producing a transparent conductive film according to claim 6, wherein: the yellowness reducing agent is methyl violet or a derivative thereof.
10. A transparent conductive film produced by the method for producing a transparent conductive film according to any one of claims 5 to 9.
11. A transparent conductive film comprises a substrate, a conductive film layer positioned on the substrate, and a cover plate positioned on one side of the transparent conductive film, which is far away from the substrate, and is characterized in that the conductive film layer comprises silver nanowires and a yellow-lowering agent which has an absorption effect on yellow light; or, the conductive film layer comprises silver nanowires, the transparent conductive film further comprises a yellowness reducing layer located on one side of the substrate or the cover plate, wherein the side of the one side of the substrate or the cover plate is far away from the conductive film layer, and the yellowness reducing layer comprises a yellowness reducing agent which has an absorption effect on yellow light.
12. The transparent conductive film according to claim 11, wherein: the mass ratio of the yellowing reducing agent to the silver nanowires is 1: 300-1: 75.
13. The transparent conductive film according to claim 11, wherein: the yellowness-reducing agent emits blue light and/or violet light.
14. The transparent conductive film according to claim 11, wherein: the yellowness reducing agent is methyl violet or a derivative thereof.
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| CN202110120423.7A CN114806279A (en) | 2021-01-28 | 2021-01-28 | Conductive ink, transparent conductive film and preparation method thereof |
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| CN202110120423.7A CN114806279A (en) | 2021-01-28 | 2021-01-28 | Conductive ink, transparent conductive film and preparation method thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015126052A1 (en) * | 2014-02-20 | 2015-08-27 | 주식회사 인포비온 | Method for manufacturing transparent conductive film using conductive nanowire |
| CN105899975A (en) * | 2013-12-23 | 2016-08-24 | 埃西勒国际通用光学公司 | Transparent optical article having a reduced yellowness appearance |
| CN107567483A (en) * | 2015-01-30 | 2018-01-09 | 斯特拉斯克莱德大学 | The purposes of eutectic |
| CN108346493A (en) * | 2018-02-27 | 2018-07-31 | 合肥微晶材料科技有限公司 | A method of by changing plasma resonance strength reduction nano-silver thread transparent conductive film yellowing |
| CN109686476A (en) * | 2019-01-04 | 2019-04-26 | 深圳市华科创智技术有限公司 | A kind of silver nanowires transparent conductive film reducing yellowing |
| US20200362187A1 (en) * | 2018-01-22 | 2020-11-19 | Dowa Electronics Materials Co., Ltd. | Silver nanowire ink and method for producing same |
-
2021
- 2021-01-28 CN CN202110120423.7A patent/CN114806279A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105899975A (en) * | 2013-12-23 | 2016-08-24 | 埃西勒国际通用光学公司 | Transparent optical article having a reduced yellowness appearance |
| WO2015126052A1 (en) * | 2014-02-20 | 2015-08-27 | 주식회사 인포비온 | Method for manufacturing transparent conductive film using conductive nanowire |
| CN107567483A (en) * | 2015-01-30 | 2018-01-09 | 斯特拉斯克莱德大学 | The purposes of eutectic |
| US20200362187A1 (en) * | 2018-01-22 | 2020-11-19 | Dowa Electronics Materials Co., Ltd. | Silver nanowire ink and method for producing same |
| CN108346493A (en) * | 2018-02-27 | 2018-07-31 | 合肥微晶材料科技有限公司 | A method of by changing plasma resonance strength reduction nano-silver thread transparent conductive film yellowing |
| CN109686476A (en) * | 2019-01-04 | 2019-04-26 | 深圳市华科创智技术有限公司 | A kind of silver nanowires transparent conductive film reducing yellowing |
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