CN110536597B - Novel light-transmitting electromagnetic protection film and preparation method thereof - Google Patents
Novel light-transmitting electromagnetic protection film and preparation method thereof Download PDFInfo
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- CN110536597B CN110536597B CN201910788048.6A CN201910788048A CN110536597B CN 110536597 B CN110536597 B CN 110536597B CN 201910788048 A CN201910788048 A CN 201910788048A CN 110536597 B CN110536597 B CN 110536597B
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- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/12—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a coating with specific electrical properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
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- H—ELECTRICITY
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0094—Shielding materials being light-transmitting, e.g. transparent, translucent
Abstract
The invention discloses a novel light-transmitting electromagnetic protection film and a preparation method thereof, wherein the novel light-transmitting electromagnetic protection film is prepared on an optical transparent substrate, and is prepared from a silver nanowire coating liquid, wherein the silver nanowire coating liquid comprises 100 parts by volume of a silver nanowire solution, 0.05-0.5 part by volume of a dispersing agent, 0.05-0.5 part by volume of a wetting agent and 0.05-0.5 part by volume of a binding agent; the preparation method comprises the following steps: 1. pretreating the surface of a substrate; 2. preparing a silver nanowire film on a substrate; 3. and drying the silver nanowire film to obtain the novel light-transmitting electromagnetic protection film. The novel light-transmitting electromagnetic protection film disclosed by the invention has good adhesion performance and uniformity.
Description
Technical Field
The invention relates to a novel light-transmitting electromagnetic protection film and a preparation method thereof, belonging to the technical field of design and preparation of electromagnetic shielding materials.
Background
With the rapid development of electronic information technology and communication technology, the space is filled with a large amount of electromagnetic waves with different energy and rich spectrum information, which causes a serious electromagnetic pollution problem and poses great threat to electronic equipment and human health. Electromagnetic wave is isolated in space by using the electromagnetic protection material, so that the influence of the electromagnetic protection material on various electronic equipment and human bodies is reduced, and the electromagnetic protection material is an important electromagnetic protection means. At present, common electromagnetic protection materials comprise metal materials, carbon materials and conductive polymer materials; however, in some specific application scenarios, the use of these traditional materials is greatly limited due to cost, weight, performance requirements; for example, in various optical windows and television guidance equipment, electromagnetic protection requires a protective material with a good shielding effect and a high light transmittance. In addition, the rapid development of the 5G technology provides fertile soil for the wide application of various wearable electronic devices, and meanwhile, in consideration of electromagnetic protection of human bodies, great demands are also made on flexible, light and transparent electromagnetic protection materials.
The metal oxide transparent conductive film-indium tin oxide film (ITO) has the advantages of high light transmittance, good conductivity, outstanding shielding effectiveness and the like, and is the most widely applied transparent conductive film material in the electronic field at present. However, with the recent large use, the ITO film exposes a large number of disadvantages: (1) indium in the ITO raw material belongs to rare metal and is not renewable, and the price is increasingly expensive, so that the manufacturing cost of the ITO film is gradually increased; (2) the ITO film is fragile and is not suitable for occasions with requirements on the flexibility of materials; (3) the preparation method of the ITO film comprises magnetron sputtering, chemical vapor deposition, vacuum reactive evaporation, laser pulse deposition and the like, the flow is complex, the requirements on process control are high, and the cost is high; (4) ITO has strong water absorption and is easy to absorb CO in air2And water chemically changes, and "mildew" occurs. Therefore, a new material is urgently needed to be searched for to replace ITO as a transparent and flexible electromagnetic protection material.
The silver nanowire, as a typical one-dimensional metal nanomaterial, not only has the high conductivity of metal silver, but also has unique optical properties and surface plasmon resonance characteristics brought by a nano-size effect, and has important applications in the fields of photoelectricity, biology, sensing and the like. The silver nanowire network formed by the silver nanowires has the advantages of high conductivity, good flexibility, excellent light transmittance and the like, and is an ITO (indium tin oxide) substitute material with great potential; at home and abroad researchers also make a great deal of effort on the preparation method of the light-transmitting shielding material based on the silver nanowires, and the shielding efficiency can reach 25dB under the condition of realizing 80% of light transmittance.
However, the light-transmitting electromagnetic protection film based on the silver nanowires still has the problems of poor adhesion performance of the silver nanowire conductive film and a substrate, easy shedding and insufficient stability in air due to low uniformity of the film.
Disclosure of Invention
The invention aims to: aiming at the problems, the invention provides a novel light-transmitting electromagnetic protection film and a preparation method thereof.
The technical scheme adopted by the invention is as follows:
the novel light-transmitting electromagnetic protection film is prepared on an optical transparent substrate, and comprises silver nanowires, a dispersing agent, a wetting agent and a binder, so that the light-transmitting electromagnetic protection film has good adhesion performance and uniformity.
In the scheme, the silver nanowires are main components, and the dispersing agent can generate steric hindrance effect among the silver nanowires to prevent the silver nanowires from agglomerating, so that the finally formed film layer is uniformly dispersed; the wetting agent can effectively reduce the surface tension, simultaneously reduce the occurrence of the phenomenon of film shrinkage caused by solvent volatilization in the process of drying and film forming, and improve the quality of the film; the adhesive has a curing effect, obviously improves the adhesive capacity between the film layer and the substrate, and simultaneously can effectively isolate air to prevent the silver nanowires from being oxidized to cause the performance degradation of the silver nanowires. Therefore, the light-transmitting electromagnetic protection film has good adhesion performance and uniformity.
Preferably, the optically transparent substrate may be one of glass, Polymethylmethacrylate (PMMA), Polystyrene (PS), polyethylene terephthalate (PET), Polycarbonate (PC), and the like.
Preferably, the light-transmitting electromagnetic protection film is prepared from a silver nanowire coating liquid, and the silver nanowire coating liquid comprises, by volume, 100 parts of a silver nanowire solution, 0.05-0.5 part of a dispersing agent, 0.05-0.5 part of a wetting agent, and 0.05-0.5 part of a binding agent.
Preferably, the concentration of the silver nanowire solution is 0.1-10mg/ml, wherein the diameter of the silver nanowire is 1-100nm, and the length of the silver nanowire is 0.5-100 μm.
Preferably, the silver nanowire solution is prepared by dispersing silver nanowires in deionized water.
Preferably, the dispersant is a water-soluble dispersant.
Preferably, the dispersing agent is octyl phenyl polyoxyethylene ether and/or a copolymer containing pigment affinity groups.
Preferably, the octyl phenyl polyoxyethylene ether is commercialized Dow TX-100, and the copolymer containing the pigment affinity group is commercialized science filling chemical KYC-913; the dispersant is used for dispersing the silver nanowires and has the characteristics of rapid viscosity reduction and good fluidity.
Preferably, the wetting agent is a fluorine-containing non-silicon polymer; the fluorine-containing non-silicon polymer has good surface tension reducing effect, good wetting effect and shrinkage cavity preventing effect, and good leveling capability, and meanwhile, the fluorine-containing non-silicon polymer does not influence the adhesion force and recoat performance on a base material because the fluorine-containing non-silicon polymer does not contain silicon.
Preferably, the fluorine-containing non-silicon polymer is commercially available from KYC-643; KYC-643 can effectively reduce surface tension, is particularly suitable for a substrate with low surface tension, has good water solubility, does not influence transparency, and has excellent anti-shrinkage capability.
Preferably, the binder is a water-soluble polyurethane.
Preferably, the silver nanowire coating liquid is prepared by adding a dispersant into a silver nanowire solution while stirring the silver nanowire solution by using a stirrer; after stirring uniformly, adding a wetting agent into the solution; and finally, adding the adhesive into the mixed solution, and uniformly stirring to obtain the silver nanowire coating liquid.
The preparation method of the novel light-transmitting electromagnetic protection film comprises the following steps:
step a: carrying out surface pretreatment on the optical transparent substrate;
step b: placing the optical transparent substrate subjected to surface pretreatment on an operation table of a coating machine, uniformly dripping silver nanowire coating liquid on the edge of the substrate, dripping a row of coating liquid at certain intervals, and starting the coating machine to prepare a silver nanowire film;
step c: and drying the silver nanowire film under a vacuum condition and finally forming to obtain the novel light-transmitting electromagnetic protection film.
Preferably, in step a, the surface of the optically transparent substrate is treated with deionized water, a mixed solution of acetone and absolute ethyl alcohol, or plasma cleaning.
In the scheme, the surface of the optical transparent substrate is pretreated to ensure that the surface of the substrate is clean and free of impurities, and the surface tension of the substrate is reduced, so that the coating liquid can be uniformly formed into a film on the optical transparent substrate, and the defects of shrinkage and the like are avoided, and the quality of the film is not influenced.
Preferably, in the step b, a wire rod scraping method is adopted to prepare the silver nanowire film, and the preparation of the silver nanowire film is controlled by controlling the distance between the coating liquids, the height of the scraper, the length of the scraper and the coating speed.
Preferably, in step b, the coating liquid pitch is 10-100mm, the height of the blade is 0.05 μm-1mm, the length of the blade is 30-600mm, and the blade coating speed is 0.1-100 mm/s.
In the scheme, the thickness of the silver nanowire film can be controlled by controlling the related parameters, and the film forming quality of the silver nanowire film is controlled.
Preferably, in step c, a two-stage drying process is adopted to dry the film, and the film is dried at a low temperature and then at a high temperature.
In the scheme, firstly, the silver nanowire film is dried at a lower temperature, so that the solvent is slowly volatilized, the silver nanowire film has enough time to be leveled, and the silver nanowires are uniformly distributed; and then drying at a higher temperature to fully cure the binder in the system, so that the curing degree is improved and good bonding between the film layer and the substrate is realized.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
(1) the prepared novel light-transmitting electromagnetic protection film not only has good light transmittance and outstanding electromagnetic shielding efficiency, but also has the advantages of good uniformity, strong adhesion with a substrate, outstanding flexibility and the like, and can greatly promote the film to be applied to practical engineering from laboratory products;
(2) in the preparation process of the novel light-transmitting electromagnetic protection film, the aqueous polyurethane binder is introduced into the silver nanowire coating liquid, so that the adhesion performance of the novel light-transmitting electromagnetic protection film and a substrate is obviously improved, and meanwhile, the silver nanowires are isolated from the air, so that the performance degradation caused by oxidation is prevented;
(3) the introduction of the dispersing agent can generate steric hindrance effect between the silver nanowires, so as to prevent agglomeration and ensure that the silver nanowires are uniformly and stably dispersed in the silver nanowire coating liquid, thereby ensuring that the finally obtained novel light-transmitting electromagnetic protection film has good uniformity;
(4) the introduction of the wetting agent effectively reduces the surface tension, so that the silver nanowire coating liquid is more easily spread on the surface of the substrate, and meanwhile, in the drying film forming process, the occurrence of the shrinkage cavity phenomenon in the solvent volatilization process is reduced, and the quality of the novel light-transmitting electromagnetic protection film is further improved.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view of a process for preparing a novel transparent electromagnetic protection film;
FIG. 2 is an electron micrograph of the novel transparent electromagnetic protective film;
FIG. 3 is a graph of the visible light transmittance (400 and 760nm) of the novel light-transmissive electromagnetic protection film;
FIG. 4 is a graph of electromagnetic shielding effectiveness of the novel light-transmitting electromagnetic protection film in the frequency range of 8-12 GHz;
FIG. 5 is a graph showing the electromagnetic shielding effectiveness of the novel light-transmitting electromagnetic protection film obtained by different area tests;
fig. 6 is a comparison graph of electromagnetic shielding effectiveness curves obtained by a 1-year test of the novel light-transmitting electromagnetic protection film placed in an atmospheric environment.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
As shown in fig. 1, a method for preparing a novel light-transmitting electromagnetic protection film includes the following three steps of preparing a silver nanowire film on an optically transparent substrate by pretreating the optically transparent substrate, and performing vacuum drying to obtain the light-transmitting electromagnetic protection film:
step a: cleaning an optical transparent substrate by using deionized water, acetone and absolute ethyl alcohol mixed solution or plasma for surface pretreatment;
step b: placing the optical transparent substrate subjected to surface pretreatment on an operation table of a coating machine, uniformly dripping silver nanowire coating liquid on the edge of the substrate, dripping a row of coating liquid at certain intervals, and starting the coating machine to prepare a silver nanowire film;
step c: and drying the silver nanowire film by adopting a two-stage drying process under a vacuum condition to prepare the novel light-transmitting electromagnetic protection film.
The silver nanowire coating liquid is prepared from the following components in parts by volume: 100 parts of silver nanowire solution, 0.05-0.5 part of dispersing agent, 0.05-0.5 part of wetting agent and 0.05-0.5 part of binding agent.
The concentration of the silver nanowire solution is 0.1-10mg/ml, wherein the silver nanowire is prepared by a chemical method, the diameter of the silver nanowire solution is 1-100nm, and the length of the silver nanowire solution is 0.5-100 mu m; the silver nanowire solution is prepared by dispersing silver nanowires in deionized water.
The dispersant is octyl phenyl polyoxyethylene ether and/or a copolymer containing pigment affinity groups, in particular to commercial TX-100 and KYC-913; the wetting agent is fluorine-containing non-silicon polymer, in particular commercial KYC-643; the binder is water-soluble polyurethane.
The preparation process of the silver nanowire coating liquid comprises the following steps: adding a dispersing agent into the silver nanowire solution while stirring the silver nanowire solution by using a magnetic stirrer; after stirring uniformly, adding a wetting agent into the solution; and finally, adding the adhesive into the mixed solution, and uniformly stirring to obtain the silver nanowire coating liquid.
Example 1
A novel transparent electromagnetic protection film is prepared by preparing a silver nanowire film on a polyethylene terephthalate (PET) substrate by using a silver nanowire coating liquid and finally drying.
The silver nano coating liquid comprises 100 parts of silver nanowire solution, 0.1 part of KYC-913 dispersing agent, 0.1 part of KYC-643 wetting agent and 0.2 part of water-soluble polyurethane by volume; the silver nanowire solution is prepared by dispersing silver nanowires with the length of 25 +/-2 mu m and the diameter of 25 +/-2 nm, which are prepared by a chemical method, in deionized water to form the silver nanowire solution with the concentration of 1 mg/ml.
The preparation method of the novel transparent electromagnetic protection film comprises the following steps:
step a: cutting a PET substrate into square blocks of 340mm multiplied by 340mm, then placing the square blocks into a mixed solution (volume ratio is 2:1:1) of deionized water, acetone and absolute ethyl alcohol for ultrasonic treatment for 20min, then washing the square blocks for 3 times by using the deionized water, and drying the square blocks by using nitrogen;
step b: placing the PET substrate subjected to surface treatment on an operation table of a coating machine, uniformly dripping coating liquid on the edge of the substrate, and dripping a row of coating liquid at intervals of 50 mm; setting parameters of a coating machine, namely, the height of a scraper is 50 mu m, the length of the scraper is 400mm, and the coating speed is 20mm/s, and starting the coating machine to coat to prepare the silver nanowire film;
step c: transferring the prepared silver nanowire film to a two-section type vacuum oven for drying treatment; firstly, baking for 2h at 100 ℃, and then baking for 30min at 120 ℃ to prepare the novel light-transmitting electromagnetic protection film.
In another embodiment, the silver nano coating liquid comprises 100 parts by volume of silver nanowire solution, 0.05 part by volume of TX-100 dispersant, 0.05 part by volume of KYC-643 wetting agent and 0.05 part by volume of water-soluble polyurethane; the silver nanowire solution is prepared by dispersing silver nanowires with the length of 15 +/-2 mu m and the diameter of 20 +/-2 nm, which are prepared by a chemical method, in deionized water to form the silver nanowire solution with the concentration of 0.5 mg/ml; the optically transparent substrate is glass.
In another embodiment, the silver nano coating liquid comprises 100 parts by volume of silver nanowire solution, 0.5 part by volume of KYC-913 dispersing agent, 0.5 part by volume of KYC-643 wetting agent and 0.5 part by volume of water-soluble polyurethane; the silver nanowire solution is prepared by dispersing silver nanowires with the length of 100 +/-10 mu m and the diameter of 100 +/-5 nm, which are prepared by a chemical method, in deionized water to form silver nanowire solution with the concentration of 3 mg/ml; the optically transparent substrate is a PMMA substrate.
As shown in FIG. 2, in order to obtain an electron micrograph of the novel transparent electromagnetic shielding film, it can be seen that the novel transparent electromagnetic shielding film has good uniformity.
And (3) carrying out adhesion test on the prepared novel light-transmitting electromagnetic protection film, wherein the peeling area is less than 5 percent and reaches 4B level, which shows that the novel light-transmitting electromagnetic protection film has good adhesion with the substrate and meets the requirement.
As shown in FIG. 3, the transmittance characteristic of the prepared novel transparent electromagnetic protection film is characterized, and the transmittance of the novel transparent electromagnetic protection film in the visible light region (400-760nm) is tested by using an ultraviolet-visible spectrometer with the model number of UV-2700, and it can be seen from the graph that the transmittance of the green light with the wavelength of 550nm reaches 84%.
As shown in fig. 4, the electromagnetic shielding effectiveness of the prepared novel light-transmitting electromagnetic protection film is tested, and it can be seen that the electromagnetic shielding effectiveness of the novel light-transmitting electromagnetic protection film is greater than 25dB in the frequency range of 8-12 GHz.
As shown in fig. 5, for the prepared novel light-transmitting electromagnetic protection film, the shielding effectiveness of 6 different regions of the novel light-transmitting electromagnetic protection film is tested and represented, the electromagnetic shielding effectiveness of the different regions of the novel light-transmitting electromagnetic protection film is basically consistent, and the good uniformity of the novel light-transmitting electromagnetic protection film is further verified.
Fig. 6 is a comparison graph of the electromagnetic shielding effectiveness of the novel transparent electromagnetic protection film prepared newly and the novel transparent electromagnetic protection film placed in the atmospheric environment for 1 year, and it can be seen that the novel transparent electromagnetic protection film has stable shielding performance, and the electromagnetic shielding effectiveness is basically unchanged when the novel transparent electromagnetic protection film is placed in the atmospheric environment for 1 year.
In conclusion, the novel light-transmitting electromagnetic protection film disclosed by the invention not only has good light transmittance and outstanding electromagnetic shielding efficiency, but also has the advantages of good uniformity, strong adhesion with a substrate, outstanding flexibility and the like, and can be used for greatly promoting the film to be applied to practical engineering from laboratory products; in the preparation process of the novel light-transmitting electromagnetic protection film, the aqueous polyurethane binder is introduced into the silver nanowire coating liquid, so that the adhesion performance of the novel light-transmitting electromagnetic protection film and a substrate is obviously improved, and meanwhile, the silver nanowires are isolated from the air, so that the performance degradation caused by oxidation is prevented; the introduction of the dispersing agent can generate steric hindrance effect between the silver nanowires, so as to prevent agglomeration and ensure that the silver nanowires are uniformly and stably dispersed in the silver nanowire coating liquid, thereby ensuring that the finally obtained novel light-transmitting electromagnetic protection film has good uniformity; the introduction of the wetting agent effectively reduces the surface tension, so that the silver nanowire coating liquid is more easily spread on the surface of the substrate, and meanwhile, in the drying film forming process, the occurrence of the shrinkage cavity phenomenon in the solvent volatilization process is reduced, and the quality of the novel light-transmitting electromagnetic protection film is further improved.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (4)
1. A novel light-transmitting electromagnetic protection film is prepared on an optical transparent substrate, and is characterized in that: the light-transmitting electromagnetic protection film comprises silver nanowires, a dispersing agent, a wetting agent and a binder, so that the light-transmitting electromagnetic protection film has good adhesion performance, uniformity and electromagnetic shielding stability;
the light-transmitting electromagnetic protection film is prepared from a silver nanowire coating liquid, wherein the silver nanowire coating liquid comprises 100 parts by volume of a silver nanowire solution, 0.05-0.5 part by volume of a dispersing agent, 0.05-0.5 part by volume of a wetting agent and 0.05-0.5 part by volume of a binding agent;
the dispersing agent is octyl phenyl polyoxyethylene ether and/or a copolymer containing pigment affinity groups, the wetting agent is a fluorine-containing non-silicon polymer, and the binder is water-soluble polyurethane;
the concentration of the silver nanowire solution is 0.1-10mg/ml, wherein the diameter of the silver nanowire is 1-100nm, and the length of the silver nanowire is 0.5-100 mu m;
the preparation process of the silver nanowire coating liquid comprises the following steps: adding a dispersing agent, a wetting agent and a bonding agent while stirring the silver nanowire solution, and uniformly stirring to obtain a silver nanowire coating liquid;
the silver nanowire coating liquid is dried into a film through a two-stage drying process, and is firstly baked for 2 hours at 100 ℃ so as to slowly volatilize the solvent, ensure that the silver nanowire film has enough time for leveling and ensure that the silver nanowires are uniformly distributed; and then baking the film for 30min at 120 ℃ to fully cure the binder in the system, thereby improving the curing degree and realizing good bonding between the film layer and the substrate.
2. The method for preparing a novel light-transmitting electromagnetic protection film as claimed in claim 1, characterized by comprising the following steps:
step a: carrying out surface pretreatment on the optical transparent substrate;
step b: placing the optical transparent substrate subjected to surface pretreatment on an operation table of a coating machine, uniformly dripping silver nanowire coating liquid on the edge of the substrate, dripping a row of coating liquid at a certain distance, and starting the coating machine to prepare a silver nanowire film;
step c: and drying the silver nanowire film under a vacuum condition and finally forming to obtain the novel light-transmitting electromagnetic protection film.
3. The method for preparing a novel light-transmitting electromagnetic protection film as claimed in claim 2, characterized in that: in the step a, the surface of the optically transparent substrate is treated by using a mixed solution of deionized water, acetone and absolute ethyl alcohol or plasma cleaning.
4. The method for preparing a novel light-transmitting electromagnetic protection film as claimed in claim 2, characterized in that: and b, preparing the silver nanowire film by adopting a wire rod blade coating method, and controlling the preparation of the silver nanowire film by controlling the distance of the coating liquid, the height of a scraper, the length of the scraper and the coating speed.
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