CN113411923B - Method for protecting silver nanowire heating film - Google Patents
Method for protecting silver nanowire heating film Download PDFInfo
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- CN113411923B CN113411923B CN202110664813.0A CN202110664813A CN113411923B CN 113411923 B CN113411923 B CN 113411923B CN 202110664813 A CN202110664813 A CN 202110664813A CN 113411923 B CN113411923 B CN 113411923B
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- 238000000034 method Methods 0.000 title claims abstract description 29
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Images
Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
- H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/02—Details
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
Landscapes
- Laminated Bodies (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a method for protecting a silver nanowire heating film, wherein a silver nanowire layer and an electrode strip are arranged on one surface of the silver nanowire heating film, and the method comprises the following steps: the protective coating liquid consists of the following components in percentage by weight: 2-90wt.% of transparent organic resin, 0.01-2wt.% of anti-ultraviolet protective agent, 0.01-2wt.% of antioxidant protective agent, solvent and the balance; coating protective coating liquid on the surfaces of the silver nanowire layer and the electrode strips, and then airing; and curing to obtain the silver nanowire heating film with the protective coating. The invention can reduce the influence of factors such as ultraviolet light damage and oxidation on the silver nanowires, thereby improving the stability of the silver nanowire heating film.
Description
Technical Field
The invention relates to a method for protecting a silver nanowire heating film.
Background
Transparent heating films are advantageous over conventional hydrophobic coatings for deicing and defogging applications in automotive or aircraft windshields and the like that require extended use. In addition, with the development of flexible electronics, transparent thin film heating devices for deicing and defogging are also in demand in electronic devices such as wearable devices, smart glasses, and outdoor equipment. At present, the most commonly used transparent film heating equipment adopts indium tin oxide glass, and the process is mature and stable. However, indium tin oxide glass itself is highly brittle as a metal oxide and is not suitable for flexible electronic devices. Meanwhile, indium tin oxide glass is generally prepared by magnetron sputtering and other methods, a large amount of vacuum equipment is needed, the manufacturing cost is high, and the preparation of oversized ITO glass is difficult. In addition, the metal oxide itself has insufficient conductivity, and the resistance is too high in a large size, which causes a rise in the use voltage, and also causes a series of problems in safety and system layout.
In order to replace the traditional indium tin oxide glass to realize the preparation of the high-performance flexible heating film, scientific researchers try different materials including graphene, carbon nanotubes, conductive polymers, metal nanostructures and the like. The silver nanowire heating film has the advantages of high flexibility, high photoelectric property, capability of realizing large-scale low-cost preparation by a solution method and the like, and is a most ideal next-generation flexible heating film. However, the stability of the silver nanowire heating film prepared at present still needs to be improved, and especially when the silver nanowire heating film is applied to buildings and automobile or airplane windshield glass, the heating film prepared by simply adopting the silver nanowires is difficult to keep stable for a long time.
The adoption of other materials compounded on the surface of the silver nanowire layer is a way for effectively improving the stability of the transparent heating film. Graphene oxide prepared by a Hummers method is used as a protective layer in CN106131984A to enhance the stability of the film heater, and polyvinyl alcohol, graphene oxide, oxide nanoparticles and the like are used as protective agents in CN104112544A to prepare the protective layer through large-proportion dilution, so that the chemical stability of the silver nanowire heating film is improved. However, in order to reduce the influence on the transmittance, the protective layer prepared by these methods is thin, and cannot completely coat the silver nanowire with poor stability. Meanwhile, the film heating device still needs to be further packaged (the packaging method is generally to coat organic resin and cure, or cover an organic film), which may further reduce the transmittance of the film and affect the performance of the device. Meanwhile, for the silver nanowire film heating device which needs to be used outdoors for a long time, besides the chemical corrosion of the oxide and the sulfide in the air to the silver nanowire, the strong ultraviolet rays in the sunlight can also damage the silver nanowire, and the stability of the transparent conductive film is reduced. Therefore, a novel protective coating material for the silver nanowire heating film needs to be developed, the problems of chemical corrosion, ultraviolet light damage and final device packaging of the silver nanowire are solved, and the performance of the silver nanowire heating film is comprehensively improved.
Disclosure of Invention
The invention aims to provide a method for protecting a silver nanowire heating film, so that the influence of factors such as ultraviolet light damage and oxidation on the silver nanowires is reduced, and the stability of the silver nanowire heating film is improved.
In order to solve the above technical problems, the present invention provides a method for protecting a silver nanowire heating film, wherein a silver nanowire layer and an electrode strip are disposed on a single surface of the silver nanowire heating film, comprising the steps of:
1) And preparing a protective coating liquid:
the protective coating layer coating liquid is composed of the following components in the following content (weight content):
transparent organic resin: 2-90wt.%,
anti-ultraviolet protective agent: 0.01-2wt.%,
an antioxidant protective agent: 0.01-2wt.%,
solvent: the balance;
2) And coating of the protective coating:
coating the protective coating liquid prepared in the step 1) on the surfaces of the silver nanowire layer and the electrode strip to form a wet film with the thickness of 20-400 mu m, wherein the silver nanowire layer and the electrode strip are covered by the wet film; then airing to obtain a coated film;
description of the drawings: 20-400 μm is the thickness of the wet film; and is the thickness between the upper surface of the wet film and the silver nanowire layer;
3) Curing the protective coating:
and (3) curing the product obtained in the step 2) (namely, curing the coated film) to obtain the silver nanowire heating film with the protective coating.
As an improvement of the method for protecting a silver nanowire heating thin film of the present invention:
the curing mode of the step 3) is UV curing or heating curing;
when UV curing is adopted, the UV curing time is 10 +/-1 s, and the curing power is 60 +/-10W;
when the heating curing is adopted, the curing temperature is 80-150 ℃, and the curing time is less than or equal to 2 hours (generally 0.5-2 hours).
As a further improvement of the method for protecting a silver nanowire heating film of the present invention:
the thickness of the protective coating after curing is 10-200 μm.
As a further improvement of the method for protecting a silver nanowire heating film of the present invention:
in the step 1):
the transparent organic resin is an organic resin with transmittance of more than 92% after curing;
description of the drawings: the transmittance is the transmittance of visible light at 550 nm.
The anti-ultraviolet protective agent is monodisperse nano particles with the particle size of less than or equal to 50 nm;
the antioxidant protective agent is an organic reducing material.
As a further improvement of the method for protecting a silver nanowire heating film of the present invention:
the transparent organic resin is any one of the following: commercial polyurethanes, polyacrylic resins, polyimides, PVC, epoxy resins, polydimethylsiloxane, thermoplastic styrene-butadiene rubber, hydrogenated styrene-butadiene block copolymers, UV curable gloss oil;
the anti-ultraviolet protective agent (monodisperse nano-particles with the particle size less than or equal to 50 nm) is any one of the following: nano TiO 2 2 Nano ZnO, nano ATO and nano ITO;
the antioxidant protective agent (organic reducing material) is any one of the following: glucose, citric acid, vitamin C and aniline.
As a further improvement of the method for protecting a silver nanowire heating film of the present invention:
the solvent is at least one of water, ethanol, isopropanol, acetone, butanone, benzene, xylene, DMF, and NMP.
As a further improvement of the method for protecting a silver nanowire heating film of the present invention, the step 1) is: adding transparent organic resin, an anti-ultraviolet protective agent and an anti-oxidation protective agent into the solvent, and stirring at 1200 +/-300 rpm for 2 +/-0.5 h to obtain the protective coating liquid.
The invention adopts organic resin (transparent organic resin) as a matrix, and the protective effect of the protective coating on the silver nanowire heating film is comprehensively improved by adding the ultraviolet-resistant and antioxidant protective agent. The organic resin covers and fills the surface of the silver nanowire heating film, so that the permeation speed of oxides and sulfides is reduced, and the ultraviolet-resistant and antioxidant protective agents inside the silver nanowire heating film are driven to be uniformly dispersed. The ultraviolet-resistant protective agent can relieve the failure problem caused by ultraviolet light damage of the silver nanowires by emitting ultraviolet rays in sunlight; the oxidation-resistant protective agent can neutralize the permeated oxides and sulfides, and further improves the chemical stability of the silver nanowire heating film.
For the protective coating of the transparent conductive film, the prior art adopts single resin as a protective layer, and the protective effect is poor. In the invention, the ultraviolet-resistant protective agent and the antioxidant protective agent with specific types and contents are adopted, so that the optical performance of the transparent conductive film is not obviously influenced by the introduction of the protective agent, and the stability of the transparent heating film can be comprehensively improved.
Compared with the prior art, the invention has the following technical advantages:
1. the protective coating can be coated by a solution method, and the method is simple, reliable, high in repeatability and suitable for large-size production.
2. The protective coating of the invention realizes the coating and the final packaging of the silver nanowire layer in the heating film at the same time, and simplifies the production process of the heating film.
3. The protective coating is isolated from the addition of the antioxidant protective agent through resin coating and prevents external oxides and sulfides from chemically corroding the silver nanowires; the ultraviolet light reflection is enhanced by adopting an ultraviolet-resistant protective agent, and the ultraviolet damage resistance of the silver nanowire is improved; the long-term stability of the silver nanowire heating film is comprehensively improved.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a silver nanowire heating film without a protective coating.
Fig. 2 is a schematic structural diagram of a silver nanowire heating film with a protective coating according to the present invention.
Detailed Description
The invention will be further described with reference to specific examples, but the scope of the invention is not limited thereto.
The silver nanowire heating film (fig. 1) used in the present invention is prepared by the existing known technology, for example, coating silver nanowires on a PET substrate and disposing electrodes, and the preparation method specifically comprises the following steps:
respectively carrying out ultrasonic treatment on a PET (polyethylene terephthalate) substrate in deionized water, ethanol and acetone for 15min, then drying, then carrying out ultraviolet-ozone hydrophilic treatment for 15min (power 300W), taking silver nanowires (the diameter is 20nm, the length is 25 mu m), using ethanol as a solvent to prepare silver nanowire dispersion liquid with the concentration of 2mg/mL, coating the silver nanowire dispersion liquid on the treated PET substrate in a blade mode, naturally airing the silver nanowire dispersion liquid in the air, then placing the silver nanowire dispersion liquid in a 120 ℃ oven for treatment for 2min to form a silver nanowire transparent film with the thickness of 200nm on the substrate, then soaking the silver nanowire transparent film in silver ammonia solution with the concentration of 0.05mol/L for treatment for 60s, naturally airing the silver nanowire transparent film, then carrying out hot pressing treatment, carrying out pressure of 30MPa, carrying out temperature of 50 ℃, and finally respectively attaching copper electrode strips with the width of 5mm to two ends of the conductive film to finish the preparation of the silver nanowire heating film.
The visible light transmittance (550 nm) of the silver nanowire heating film prepared by the method is 88%; the heating temperature is 93 ℃ under 12V; after being used for 10 days in a normal environment, the heating temperature is reduced to 60 ℃ at 12V; and the rubber composition fails after being used for 30 days under normal environment.
The normal environment refers to an environment with the temperature of 25 ℃ and the humidity of 50%.
The silver nanowire heating film prepared by the above method is used in the following cases.
Example 1, a method for protecting a silver nanowire heating film, sequentially performing the following steps:
1) And preparing a protective coating liquid:
adding organic resin, an anti-ultraviolet protective agent and an anti-oxidation protective agent into a solvent, and stirring at 1200rpm for 2 hours to obtain a protective coating liquid, wherein the coating liquid comprises the following components in percentage by mass:
transparent organic resin: commercial basf Laromer LR 9013,3wt. -%
Anti-ultraviolet protective agent: tiO with particle size of 50nm 2 Monodisperse powder, 0.1wt. -%)
An antioxidant protective agent: citric acid, 0.1wt. -%)
Solvent: isopropanol, 96.8wt. -%)
2) And coating of the protective coating:
as shown in fig. 2, the protective coating liquid prepared in step 1) was coated on the surfaces of the silver nanowire layer and the electrode stripes, which were covered with the wet film, using a doctor blade to form a wet film having a thickness of about 400 μm; then airing at room temperature (standing at room temperature for about 30 min) to obtain a coated film;
description of the invention: 400 μm is the wet film thickness; and is the thickness between the upper surface of the wet film and the silver nanowire layer;
3) Curing of the protective coating:
carrying out UV curing on the product obtained in the step 2), namely carrying out UV curing on the silver nanowire heating film coated with the protective coating liquid; curing time is 10s, power is 60W, the thickness of the protective coating after curing is 15 mu m, and finally the silver nanowire heating film with the protective coating is obtained.
The visible light transmittance (550 nm) of the silver nanowire heating film with the protective coating is 87.7 percent, namely, is reduced by 0.3 percent, and the heating temperature is 93 ℃ at 12V; after 300 days of use in normal environment, the heating temperature is 93 ℃ at 12V; the salt spray test is carried out according to GB/T2423.17-2008, the heating temperature is reduced to 60 ℃ at 12V after 150 hours, and the salt spray test fails after 200 hours.
Example 2, a protective coating for a silver nanowire heating film, sequentially performed the following steps:
1) And preparing a protective coating liquid:
adding organic resin, an anti-ultraviolet protective agent and an anti-oxidation protective agent into a solvent, and stirring at 1200rpm for 2 hours to obtain a protective coating liquid, wherein the coating liquid comprises the following components in percentage by mass:
organic resin: commercial Dow Corning 184 Dimethicone, 10wt. -%)
Anti-ultraviolet protective agent: AZO monodisperse powder with particle size of 30nm, 0.05wt. -%
Antioxidant protective agent: aniline, 0.2wt. -%)
Solvent: xylene, 89.75wt. -% ]
2) And coating of the protective coating:
as shown in fig. 2, the protective coating liquid prepared in step 1) was applied on the surfaces of the silver nanowire layer and the electrode bars, which were covered with the wet film, using a doctor blade to form a wet film having a thickness of about 200 μm. Then dried at room temperature (left at room temperature for about 30 min) to obtain a coated film.
3) Curing of the protective coating:
heating and curing the silver nanowire heating film coated with the protective coating liquid obtained in the step 2) at the curing temperature of 120 ℃ for 2 hours, wherein the thickness of the cured protective coating is 25 micrometers, and finally obtaining the silver nanowire heating film with the protective coating;
the visible light transmittance (550 nm) of the silver nanowire heating film with the protective coating is 87.9 percent, namely, the visible light transmittance is reduced by 0.1 percent, and the heating temperature is 93 ℃ at 12V; after 300 days of use in normal environment, the heating temperature is 93 ℃ at 12V; the salt spray test was performed according to GB/T2423.17-2008, and the heating temperature was reduced to 60 ℃ at 12V after 100 hours, and failed after 160 hours.
Example 3-1, the amount of the organic resin "commercial basf Laromer LR 9013" in the coating liquid of example 1 was changed from 3wt.% to 1.5wt.%, and the amount of the solvent isopropyl alcohol was adjusted accordingly so as to ensure that the sum of the component mass ratios was still 100%.
The results obtained were: the visible light transmittance (550 nm) of the silver nanowire heating film with the protective coating is 87.7 percent, namely, is reduced by 0.3 percent, and the heating temperature is 93 ℃ at 12V; after 300 days of use in normal environment, the heating temperature is 93 ℃ at 12V; according to the salt spray test of GB/T2423.17-2008, the heating temperature is reduced to 60 ℃ at 12V after 75 hours, and the product fails after 100 hours.
Example 3-2, the amount of the organic resin "commercial basf Laromer LR 9013" in the coating liquid of example 1 was changed from 3wt.% to 2wt.%, and the amount of the solvent isopropyl alcohol was adjusted accordingly, so as to ensure that the sum of the component mass ratios was still 100%.
The results obtained were: the visible light transmittance (550 nm) of the silver nanowire heating film with the protective coating is 87.7 percent, namely, is reduced by 0.3 percent, and the heating temperature is 93 ℃ at 12V; after 300 days of use in normal environment, the heating temperature is 93 ℃ at 12V; the salt spray test was performed according to GB/T2423.17-2008, and the heating temperature was reduced to 60 ℃ at 12V after 100 hours, and failed after 140 hours.
Examples 3-3, the amount of organic resin "commercial basf Laromer LR 9013" in the coating liquid of example 1 was changed from 3wt.% to 1wt.%, and the amount of solvent isopropyl alcohol was adjusted accordingly, so as to ensure that the sum of the component mass ratios was still 100%.
The results obtained were: the visible light transmittance (550 nm) of the silver nanowire heating film with the protective coating is 87.7 percent, namely, is reduced by 0.3 percent, and the heating temperature is 93 ℃ at 12V; after 300 days of use in normal environment, the heating temperature is 93 ℃ at 12V; according to the salt spray test of GB/T2423.17-2008, the heating temperature is reduced to 60 ℃ at 12V after 40 hours, and the product fails after 60 hours.
Comparative example 1 the organic resin in example 1 was completely replaced with a solvent (isopropanol), i.e. the formulation of the coating liquid was:
anti-ultraviolet protective agent: tiO with particle size of 50nm 2 Monodisperse powder, 0.1wt. -%)
An antioxidant protective agent: citric acid, 0.1wt. -%)
Solvent: isopropanol, 99.8wt.%;
the remaining equivalents were as in example 1, and the results were: the visible light transmittance (550 nm) is 87.9 percent, but the protective effect of the protective coating is obviously reduced, and the heating temperature of the silver nanowire heating film is 93 ℃ under 12V; after being used for 15 days under normal environment, the heating temperature is reduced to 60 ℃ under 12V; and the film fails after being used for 50 days under normal environment.
Comparative example 2, the anti-uv protective agent in example 1 was completely replaced with a solvent, that is, the formulation of the coating liquid was:
transparent organic resin: commercial basf Laromer LR 9013,3wt. -%
An antioxidant protective agent: citric acid, 0.1wt. -%)
Solvent: isopropanol, 96.9wt.%;
the rest of the equivalents are as in example 1. The results obtained were: the visible light transmittance (550 nm) is 87.8 percent; the protection effect of the protective coating is reduced, and the heating temperature of the silver nanowire heating film is 93 ℃ at 12V; after 300 days of use in normal environment, the temperature was 85 ℃ at 12V.
Comparative example 3, the antioxidant protectant in example 1 was completely replaced with a solvent, i.e., the formulation of the coating solution was:
transparent organic resin: commercial basf Laromer LR 9013,3wt. -%
Anti-ultraviolet protective agent: tiO with particle size of 50nm 2 Monodisperse powder, 0.1wt. -%)
Solvent: isopropanol, 96.9wt.%;
the rest of the equivalents are the same as in example 1. The results obtained were: the visible light transmittance (550 nm) is 87.8 percent; but the protection effect of the protective coating is reduced, and the heating temperature of the silver nanowire heating film is 93 ℃ at 12V; after 300 days of use in normal environment, the temperature was 73 ℃ at 12V.
Comparative example 4, in example 1, step 3) was eliminated, and the rest was identical to example 1. The results obtained were: the visible light transmittance (550 nm) is 87.8 percent; but the protection effect of the protective coating is reduced, and the heating temperature of the silver nanowire heating film is 93 ℃ at 12V; after 300 days of use in normal environment, the temperature was 60 ℃ at 12V.
Finally, it is also noted that the above-mentioned lists merely illustrate a few specific embodiments of the invention. It is obvious that the invention is not limited to the above embodiments, but that many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.
Claims (5)
1. The method for protecting the silver nanowire heating film is characterized by comprising the following steps of:
1) And preparing a protective coating liquid:
the protective coating liquid consists of the following components in percentage by weight:
transparent organic resin: 2-90wt.%,
anti-ultraviolet protective agent: 0.01-2wt.%,
an antioxidant protective agent: 0.01-2wt.%,
solvent: the balance;
the transparent organic resin is an organic resin with transmittance of more than 92% after curing;
the anti-ultraviolet protective agent is monodisperse nano particles with the particle size of less than or equal to 50 nm;
the antioxidant protective agent is an organic reducing material;
2) And coating of the protective coating:
coating the protective coating liquid prepared in the step 1) on the surfaces of the silver nanowire layer and the electrode strips to form a wet film with the thickness of 20-400 microns, wherein the silver nanowire layer and the electrode strips are covered by the wet film; then airing to obtain a coated film;
3) Curing of the protective coating:
curing the substance obtained in the step 2) to obtain a silver nanowire heating film with a protective coating;
the curing mode is UV curing or heating curing;
when UV curing is adopted, the UV curing time is 10 +/-1 s, and the curing power is 60 +/-10W;
when the heating curing is adopted, the curing temperature is 80-150 ℃, and the time is less than or equal to 2 hours;
the thickness of the protective coating after curing is 10-200 μm.
2. The method for protecting a silver nanowire heating film as claimed in claim 1, wherein:
the transparent organic resin is any one of the following: commercial polyurethane, polyacrylic resin, polyimide, PVC, epoxy resin, polydimethylsiloxane, thermoplastic styrene-butadiene rubber, hydrogenated styrene-butadiene block copolymer and UV curing gloss oil;
the ultraviolet-resistant protective agent is any one of the following: nano TiO 2 2 Nano ZnO, nano ATO and nano ITO;
the antioxidant protective agent is any one of the following: glucose, citric acid, vitamin C and aniline.
3. The method for protecting a silver nanowire heating film as claimed in claim 2, wherein:
the solvent is at least one of water, ethanol, isopropanol, acetone, butanone, benzene, xylene, DMF and NMP.
4. The method for protecting a silver nanowire heating film as claimed in any one of claims 1 to 3, wherein the step 1) is: adding transparent organic resin, an anti-ultraviolet protective agent and an anti-oxidation protective agent into the solvent, and stirring at 1200 +/-300 rpm for 2 +/-0.5 h to obtain the protective coating liquid.
5. The method for protecting a silver nanowire heating film as claimed in claim 1, wherein the following steps are sequentially performed:
1) And preparing a protective coating liquid:
adding organic resin, an anti-ultraviolet protective agent and an anti-oxidation protective agent into a solvent, and stirring at 1200rpm for 2 hours to obtain a protective coating liquid, wherein the coating liquid comprises the following components in percentage by mass:
transparent organic resin: commercial basf Laromer LR 9013,3wt.%;
anti-ultraviolet protective agent: tiO with particle size of 50nm 2 Monodisperse powder, 0.1wt.%;
antioxidant protective agent: citric acid, 0.1wt.%;
solvent: isopropanol, 96.8wt.%;
2) And coating of the protective coating:
coating the protective coating liquid prepared in the step 1) on the surfaces of the silver nanowire layer and the electrode strips by using a scraper to form a wet film with the thickness of 400 mu m, wherein the silver nanowire layer and the electrode strips are covered by the wet film; then standing at room temperature for 30min, and airing to obtain a coated film;
3) Curing the protective coating:
and (3) carrying out UV curing on the product obtained in the step 2), wherein the curing time is 10s, the power is 60W, and the thickness of the cured protective coating is 15 mu m, so that the silver nanowire heating film with the protective coating is finally obtained.
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