CN113658746B - Conductive film and preparation method thereof - Google Patents
Conductive film and preparation method thereof Download PDFInfo
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- CN113658746B CN113658746B CN202110710555.5A CN202110710555A CN113658746B CN 113658746 B CN113658746 B CN 113658746B CN 202110710555 A CN202110710555 A CN 202110710555A CN 113658746 B CN113658746 B CN 113658746B
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- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/14—Non-insulated conductors or conductive bodies characterised by their form comprising conductive layers or films on insulating-supports
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
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Abstract
The invention provides a conductive film and a preparation method thereof, wherein the conductive film comprises: a substrate; a hydrophobic template array layer, a conductive layer and a protective layer; the preparation method of the conductive film comprises the following steps: preparing a hydrophobic template array layer on one side of a substrate; preparing a conductive layer between adjacent hydrophobic templates on one side surface of the substrate; and preparing a protective layer on the hydrophobic template array layer and one side of the conductive layer far away from the substrate. The method of the invention utilizes the coating of the conductive liquid after the obstruction of the hydrophobic template array layer to ensure that the conductive liquid only stays at the place which is not covered by the hydrophobic template array layer before, thereby forming the conductive circuit to replace the traditional laser etching process; meanwhile, because a laser etching process is not used, the thick coating of the protective liquid can be realized, the thickness of the finally formed protective layer can reach 0.2-10 mu m, and compared with the laser etching process, the protective effect of the protective layer is greatly enhanced.
Description
Technical Field
The invention relates to the technical field of display touch modules, in particular to a conductive film and a preparation method thereof.
Background
The existing large-size display touch module is mainly divided into two types, one is a nano silver wire transparent conductive film, and the other is a metal grid transparent conductive film. Because the metal grid has the disadvantages of high cost, poor appearance, obvious mole lines and the like, more and more large-size touch modules begin to be replaced by the nano silver wire transparent conductive film. The existing preparation process of the nano silver wire transparent conductive film comprises the following steps: performing precision coating of a nano silver wire on the surface of the membrane material, performing precision coating of an ultrathin protective layer on the surface of the nano silver wire, performing coating of conductive silver paste on the edge of the membrane material, and performing laser etching to form a conductive circuit; the current preparation process has the following problems: the middle of the laser etched circuit is only protected by an ultrathin layer of protective layer, so that silver migration is easy to occur, circuit short circuit is caused, and touch failure occurs; the thin protective coating has a common protective effect on an aging experiment, but the thick coating cannot be protected due to the need of laser etching; the laser etching process is costly, limits mass production speed to a certain extent, and wastes expensive silver nanowires.
Based on the technical defects of the preparation of the current nano silver wire transparent conductive film, the improvement is needed.
Disclosure of Invention
In view of the above, the present invention provides a conductive film and a method for manufacturing the same, so as to solve or partially solve the technical problems in the prior art.
In a first aspect, the present invention provides a conductive film comprising:
a substrate;
a hydrophobic template array layer located on one side of the substrate;
the conducting layer is positioned on one side surface of the substrate and positioned between the adjacent hydrophobic templates;
and the protective layer covers the hydrophobic template array layer and one side of the conducting layer, which is far away from the substrate.
Preferably, the thickness of the protective layer in the conductive film is 0.2 to 10 μm.
In a second aspect, the present invention further provides a method for preparing the conductive film, including the following steps:
providing a base material;
preparing a hydrophobic template array layer on one side of the substrate;
preparing a conductive layer between adjacent hydrophobic templates on one side of the substrate;
and preparing a protective layer on the hydrophobic template array layer and one side of the conductive layer far away from the substrate.
Preferably, the method for preparing the conductive film, wherein the step of preparing the hydrophobic template array layer on one side of the substrate specifically comprises:
preparing hydrophobic template liquid;
the hydrophobic template liquid is printed on the substrate by silk screen printing, namely, one side of the substrate is provided with hydrophobic
A template array layer;
wherein, the hydrophobic template liquid comprises the following components: the solvent-free water-repellent resin comprises a first hydrophobic resin, a first initiator, a first auxiliary agent and a first solvent.
Preferably, in the method for manufacturing the conductive film, the first hydrophobic resin is a thermosetting or photocurable resin, and the first hydrophobic resin includes at least one of silicone resin, hydrophobic epoxy resin, fluorine resin, acrylic resin, polyester resin, polyether resin, silicone resin, and polyurethane resin;
and/or the first auxiliary agent comprises a first defoaming agent, a first leveling agent, a first dispersing agent and a first lubricating agent
At least one of a wetting agent, a first thickener, and a first anti-soil agent;
and/or the first solvent comprises water, methanol, ethanol, isopropanol, n-butanol, isobutanol, acetone,
At least one of butanone, methyl isobutyl ketone, ethyl acetate, butyl butyrate, ethyl butyrate, ethylene glycol, glycerol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, acetonitrile, dimethylformamide, toluene, xylene, trimethylbenzene, petroleum ether, cyclohexane and cyclohexanone;
and/or the mass ratio of the first hydrophobic resin, the first initiator, the first auxiliary agent and the first solvent is (30-90): (0.01-45): (0.01-5): (8-68).
Preferably, the method for preparing the conductive film, wherein the conductive layer is prepared between adjacent hydrophobic templates on one side of the substrate, specifically comprises the following steps:
preparing a conductive liquid;
coating the conductive liquid on one side of the substrate to obtain a conductive layer;
wherein the conductive liquid comprises the following components: the conductive nano material, the second assistant and the second solvent.
Preferably, in the method for preparing the conductive film, the conductive nanomaterial includes at least one of a gold nanowire, a silver nanowire, a copper nanowire, a single-layer carbon nanotube, a multi-layer carbon nanotube, a single-layer graphene, a multi-layer graphene, a single-layer graphene oxide, a multi-layer graphene oxide, a single-layer reduced graphene oxide, a multi-layer reduced graphene oxide, a gold nanopowder, a silver nanopowder, and a copper nanopowder;
and/or the second auxiliary agent comprises a second defoaming agent, a second leveling agent, a second dispersing agent and a second moistening agent
At least one of a wetting agent, a second thickening agent, and a second anti-stain agent;
and/or the second solvent comprises water, methanol, ethanol, isopropanol, n-butanol, isobutanol, propyl
At least one of ketone, butanone, methyl isobutyl ketone, ethyl acetate, butyl butyrate, ethyl butyrate, ethylene glycol, glycerol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, acetonitrile, dimethylformamide, toluene, xylene, trimethylbenzene, petroleum ether, cyclohexane and cyclohexanone;
and/or the mass ratio of the conductive nano material, the second auxiliary agent and the second solvent is (0.05-15): (0.01-5): (80-99).
Preferably, the preparation method of the conductive film, wherein the preparation of the protective layer on the hydrophobic template array layer and the side of the conductive layer away from the substrate specifically comprises:
preparing a protective solution;
coating a protective solution on the hydrophobic template array layer and the side of the conductive layer far away from the substrate
Preparing to obtain a protective layer;
wherein the protective solution comprises the following components: the second resin, a second initiator, a third auxiliary agent and a third solvent.
Preferably, in the method for manufacturing the conductive film, the second resin is a thermosetting resin or a photo-curing resin, and the second resin includes at least one of an acrylic resin, a polyurethane resin, an epoxy resin, a polyester resin, a polyether resin, and a silicone resin.
Preferably, in the method for manufacturing the conductive film, the third auxiliary agent includes at least one of a third defoaming agent, a third leveling agent, a third dispersing agent, a third wetting agent, a third thickening agent, a third anti-fouling agent, and an ultraviolet absorber;
and/or the third solvent comprises water, methanol, ethanol, isopropanol, n-butanol, isobutanol and propane
At least one of ketone, butanone, methyl isobutyl ketone, ethyl acetate, butyl butyrate, ethyl butyrate, ethylene glycol, glycerol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, acetonitrile, dimethylformamide, toluene, xylene, trimethylbenzene, petroleum ether, cyclohexane and cyclohexanone;
and/or the mass ratio of the second resin, the second initiator, the third auxiliary agent and the third solvent is (15-90): (0.05-45): (0.01-5): (8-84).
Compared with the prior art, the conductive film and the preparation method thereof have the following beneficial effects:
(1) according to the preparation method of the conductive film, the hydrophobic template array layer is coated and prepared by utilizing a screen printing process which is high in coating efficiency and low in cost and is used for blocking the coating of the conductive liquid, so that the conductive liquid only stays at the position which is not covered by the hydrophobic template array layer before, and a conductive circuit is formed to replace the traditional laser etching process, and the hydrophobic template array layer can well prevent the conductive layer from being short-circuited and avoid touch failure; meanwhile, because the laser etching process is not used, the protective liquid can be thickly coated, the thickness of the finally formed protective layer can reach 0.2-10 mu m, while the thickness of the protective layer of the traditional laser etching process is only 0.05-0.1 mu m, and compared with the laser etching process, the protective effect of the protective layer is greatly enhanced;
(2) according to the conductive film prepared by the invention, the conductive layer is positioned on one side surface of the substrate and positioned between the adjacent hydrophobic templates, the hydrophobic template array layer plays a role in preventing the possibility of short circuit between the conductive layers, the protective layer covers the hydrophobic template array layer, the conductive layer is far away from one side surface of the substrate, and the protective layer plays a role in protecting the conductive layer and the hydrophobic template array layer, so that the conductive layer is prevented from being scratched by physics to change the appearance or from generating chemical reaction to change the physical and chemical properties of the conductive layer.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic diagram of a conductive film according to one embodiment of the present invention;
FIG. 2 is a top view of the hydrophobic template array layer and the conductive layer according to one embodiment of the present invention.
Detailed Description
In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
An embodiment of the present application provides a conductive film, as shown in fig. 1, including:
a substrate 1;
a hydrophobic template array layer 2 which is positioned on one side surface of the substrate 1;
the conducting layer 3 is positioned on one side surface of the substrate 1 and positioned between the adjacent hydrophobic templates;
and the protective layer 4 covers the hydrophobic template array layer 2 and one side of the conducting layer 3, which is far away from the substrate 1.
In the present embodiment, the material of the substrate 1 may be a flexible material, for example, PET, COP, COC, PI, PMMA, PC, etc.; the hydrophobic template array layer 2 comprises a plurality of hydrophobic templates and is positioned on one side surface of the substrate 1, the conducting layer 3 is also positioned on one side surface of the substrate 1 and is positioned between adjacent hydrophobic templates, the hydrophobic template array layer 2 plays a role in preventing the conducting layer 3 from being short-circuited, the protective layer 4 covers the hydrophobic template array layer 2, the conducting layer 3 is far away from one side surface of the substrate 1, and the protective layer 4 plays a role in protecting the conducting layer 3 and the hydrophobic template array layer 2 to prevent the conducting layer 3 from being scratched by physics to change the appearance or generate chemical reaction to change the physical and chemical properties of the conducting layer and the hydrophobic template array layer 2.
Fig. 2 shows a top view of the hydrophobic template array layer 2 and the conductive layer 3. as can be seen from fig. 2, the hydrophobic template array layer 2 allows the conductive layer 3 to form a circuit.
In some embodiments, the thickness of the protective layer 4 is 0.2-10 μm.
Based on the same inventive concept, the invention also provides a preparation method of the conductive film, which comprises the following steps:
s1, providing a substrate;
s2, preparing a hydrophobic template array layer on one side surface of the substrate;
s3, preparing a conductive layer between adjacent hydrophobic templates on one side of the substrate;
s4, preparing a protective layer on the hydrophobic template array layer and the side of the conductive layer far away from the substrate.
In some embodiments, preparing the hydrophobic template array layer on one side of the substrate specifically comprises:
preparing hydrophobic template liquid;
the hydrophobic template liquid is printed on the base material by silk screen printing, namely a hydrophobic template array is prepared on one side of the base material
A column layer;
wherein, the hydrophobic template liquid comprises the following components: the composite material comprises a first hydrophobic resin, a first initiator, a first auxiliary agent and a first solvent.
In the embodiment of the present application, the hydrophobic template solution is coated on the substrate by a screen printing method, and after curing, the substrate is dried at 50 to 150 ℃, and if the substrate is a photo-curing resin, the energy is required to be 200 to 3000mJ/cm2The specific silk-screen printing pattern is determined according to the designed conducting layer circuit, the silk-screen printing pattern is the same as the part needing to be etched by laser, a layer of convex template is formed, and the function of arranging the conducting liquid coated later into a conducting circuit is achieved; the specific mass ratio of each component in the hydrophobic template liquid is determined according to actual conditions, and a good dispersing and dissolving screen printing effect can be achieved mainly according to the thickness of the hydrophobic template array layer and whether the whole formula can achieve the effect; the first auxiliary agent in the hydrophobic template liquid mainly plays a role in better dispersing, wetting and leveling the first hydrophobic resin and the first initiator in the first solvent to form a more uniform and stable state; the first solvent is mainly used for dispersing various materials, so that silk-screen printing is convenient; the first initiator mainly plays a role in accelerating the curing reaction so that the first hydrophobic treeThe internal linkage of the lipid plays a more robust role, and the first initiator is a thermal initiator or a photoinitiator, respectively, which are commonly used in the market. According to the preparation method of the conductive film, the hydrophobic template array layer is coated by utilizing a screen printing process with high coating efficiency and low cost and is used for blocking the coating of the later conductive liquid, so that the conductive liquid only stays at a place which is not covered by the hydrophobic template array layer before, and a conductive circuit is formed to replace the traditional laser etching process, and the hydrophobic template array layer can well prevent the conductive layer from being short-circuited and avoid touch failure; meanwhile, because the laser etching process is not used, the protective liquid can be thickly coated, the thickness of the finally formed protective layer can reach 0.2-10 mu m, while the thickness of the protective layer of the traditional laser etching process is only 0.05-0.1 mu m, and the protective effect of the protective layer is greatly enhanced.
In some embodiments, the first hydrophobic resin is a thermosetting or photocurable resin, and the first hydrophobic resin includes at least one of silicone resin, hydrophobic epoxy resin, fluorine resin, acrylic resin, polyester resin, polyether resin, silicone resin, and polyurethane resin;
and/or the first auxiliary agent comprises a first defoaming agent, a first leveling agent, a first dispersing agent, a first wetting agent,
At least one of a first thickener and a first antifoulant;
and/or the first solvent comprises at least one of water, methanol, ethanol, isopropanol, n-butanol, isobutanol, acetone, butanone, methyl isobutyl ketone, ethyl acetate, butyl butyrate, ethyl butyrate, ethylene glycol, glycerol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, acetonitrile, dimethylformamide, toluene, xylene, trimethylbenzene, petroleum ether, cyclohexane and cyclohexanone;
and/or the mass ratio of the first hydrophobic resin, the first initiator, the first auxiliary agent and the first solvent is (30-90): (0.01-45): 0.01-5): 8-68.
It should be noted that, as the first defoaming agent in the embodiment of the present application, BYK-014, BYK-016, BYK-019, BYK-052, BYK-054, DC163, DB310, defom 5300, defom 6800, and the like can be specifically adopted; the first leveling agent can specifically adopt BYK-300, BYK-306, BYK-323, BYK-331, DC11, DC29, DC30, DC57, tego-435, tego-455 and the like; the first dispersant may be specifically adopted
BYK-2008, BYK-2015, BYK-2020, tego-610s, tego-680uv, tego-688 and the like; the first wetting agent can specifically adopt BYK-101, BYK-102, BYK-P104, tego-715w, tego-656 and the like; the first thickener can be starch, acacia, pectin, agar, gelatin, alginate jelly, carrageenan, dextrin, carboxymethyl cellulose, propylene glycol alginate, methyl cellulose, sodium starch phosphate, sodium carboxymethyl cellulose, sodium alginate, casein, sodium polyacrylate, polyoxyethylene, polyvinylpyrrolidone, etc.; the first anti-fouling agent specifically can employ tego-he328, tego-he100, tego-1000, tego-5000, and the like.
In some embodiments, the step of preparing the conductive layer on one side of the substrate between the adjacent hydrophobic templates is specifically as follows:
preparing a conductive liquid;
coating the conductive liquid on one side of the substrate to obtain a conductive layer;
the conductive liquid comprises the following components: the conductive nano material, the second assistant and the second solvent.
It should be noted that, in the embodiment of the present application, the conductive layer is prepared by preparing the conductive liquid, then coating the conductive liquid on one side of the substrate, and drying the substrate at 40 to 180 ℃, and the specific coating manner may be dimple coating, comma coating, slit extrusion coating, spray gun coating, screen printing, and the like. The second auxiliary agent in the conductive liquid mainly plays a role in better dispersing, wetting and leveling the conductive nano material to form a more uniform and stable state; the second solvent is mainly used for dispersing various materials and is convenient to coat.
In some embodiments, the conductive nanomaterial comprises at least one of a gold nanowire, a silver nanowire, a copper nanowire, a single-layer carbon nanotube, a multilayer carbon nanotube, a single-layer graphene, a multilayer graphene, a single-layer graphene oxide, a multilayer graphene oxide, a single-layer reduced graphene oxide, a multilayer reduced graphene oxide, a gold nanopowder, a silver nanopowder, and a copper nanopowder;
and/or the second auxiliary agent comprises a second defoaming agent, a second leveling agent, a second dispersing agent and a second moistening agent
At least one of a wetting agent, a second thickening agent, and a second stain repellent;
and/or the second solvent comprises water, methanol, ethanol, isopropanol, n-butanol, isobutanol, propyl
At least one of ketone, butanone, methyl isobutyl ketone, ethyl acetate, butyl butyrate, ethyl butyrate, ethylene glycol, glycerol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, acetonitrile, dimethylformamide, toluene, xylene, trimethylbenzene, petroleum ether, cyclohexane and cyclohexanone;
and/or the mass ratio of the conductive nano material, the second auxiliary agent and the second solvent is (0.05-15): (0.01-5): (80-99).
The second antifoaming agent may specifically be BYK-014, BYK-016, BYK-019, or BYK-019,
BYK-052, BYK-054, DC163, DB310, defom 5300, defom 6800, etc.; the second flatting agent can specifically adopt BYK-300, BYK-306, BYK-323, BYK-331, DC11, DC29, DC30, DC57, tego-435, tego-455 and the like; the second dispersant can specifically adopt BYK-2008, BYK-2015, BYK-2020, tego-610s, tego-680uv, tego-688 and the like; the second wetting agent can specifically adopt BYK-101, BYK-102, BYK-P104, tego-715w, tego-656 and the like; the second thickener can be starch, acacia, pectin, agar, gelatin, alginate jelly, carrageenan, dextrin, carboxymethyl cellulose, propylene glycol alginate, methyl cellulose, sodium starch phosphate, sodium carboxymethyl cellulose, sodium alginate, casein, sodium polyacrylate, polyoxyethylene, polyvinylpyrrolidone, etc.; specifically, tego-he328, tego-he100, tego-1000, tego-5000, etc. can be used as the second anti-fouling agent.
In some embodiments, the step of preparing the protective layer on the hydrophobic template array layer and the side of the conductive layer away from the substrate is specifically as follows:
preparing a protective solution;
coating the protective solution on the hydrophobic template array layer and the side of the conductive layer far away from the substrate to prepare a protective layer;
the protective solution comprises the following components: the second resin, a second initiator, a third auxiliary agent and a third solvent.
In the embodiment of the present application, the protective solution is coated on the surface of the hydrophobic template array layer and the conductive layer, and after curing, the protective solution is dried at 50 to 150 ℃, and if the protective solution is a photo-curable resin, the energy is required to be 200 to 3000mJ/cm2The protective layer is mainly used for protecting the conductive layer, the appearance of the conductive layer is prevented from being changed by physical scratches or the physical and chemical properties of the conductive layer are changed by chemical reaction, the second initiator mainly plays a role in accelerating the curing reaction so that the internal link of the second resin is firmer, and the second initiator is a common thermal initiator or photoinitiator in the market. The third auxiliary agent is mainly used for assisting the second resin and the second initiator to better disperse, wet and level in the third solvent, so that a more uniform and stable state is formed. The third solvent is mainly used for dispersing various materials and is convenient to coat.
In some embodiments, the second resin is a thermosetting resin or a photo-setting resin, and the second resin includes at least one of an acrylic resin, a polyurethane resin, an epoxy resin, a polyester resin, a polyether resin, and a silicone resin.
In some embodiments, the third adjunct includes at least one of a third defoamer, a third leveling agent, a third dispersant, a third wetting agent, a third thickener, a third antifoulant, and a uv absorber;
and/or the third solvent comprises water, methanol, ethanol, isopropanol, n-butanol, isobutanol and propane
At least one of ketone, butanone, methyl isobutyl ketone, ethyl acetate, butyl butyrate, ethyl butyrate, ethylene glycol, glycerol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, acetonitrile, dimethylformamide, toluene, xylene, trimethylbenzene, petroleum ether, cyclohexane and cyclohexanone;
and/or the mass ratio of the second resin, the second initiator, the third auxiliary agent and the third solvent is (15-90): (0.05-45): (0.01-5): (8-84).
In the present embodiment, as the third defoaming agent, BYK-014, BYK-016, BYK-019, BYK-052, BYK-054, DC163, DB310, defom 5300, defom 6800 and the like can be specifically used; the third flatting agent can specifically adopt BYK-300, BYK-306, BYK-323, BYK-331, DC11, DC29, DC30, DC57, tego-435, tego-455 and the like; the third dispersant can specifically adopt BYK-2008, BYK-2015, BYK-2020, tego-610s, tego-680uv, tego-688 and the like; the third wetting agent can specifically adopt BYK-101, BYK-102, BYK-P104, tego-715w, tego-656 and the like; the third thickener can be starch, acacia, pectin, agar, gelatin, alginate jelly, carrageenan, dextrin, carboxymethyl cellulose, propylene glycol alginate, methyl cellulose, sodium starch phosphate, sodium carboxymethyl cellulose, sodium alginate, casein, sodium polyacrylate, polyoxyethylene, polyvinylpyrrolidone, etc.; the third anti-fouling agent can specifically adopt tego-he328, tego-he100, tego-1000, tego-5000 and the like; as the ultraviolet absorber, phenyl o-hydroxybenzoate, 2, 4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, hexamethylphosphoric triamide and the like can be specifically used.
The following further describes a method for producing a conductive film of the present application with specific examples.
Example 1
The embodiment of the application provides a preparation method of a conductive film, which comprises the following steps:
s1, providing a PET substrate with the thickness of 125 μm;
s2, preparing a hydrophobic template solution, coating the hydrophobic template solution on one side of the PET substrate by a screen printing method, and using 500mJ/cm2After UV light curing, drying at 80 ℃ to obtain a hydrophobic template array layer; wherein the hydrophobic template liquid comprises the following components in percentage by massDividing into: 60% of polyurethane acrylic resin, 1.5% of photoinitiator 184, 1.5% of photoinitiator 651, 0.2% of tego-5000, 0.6% of polyvinylpyrrolidone, 0.2% of BYK-054 and 36% of ethyl acetate;
s3, preparing a conductive liquid, coating the conductive liquid on one side surface of the PET substrate, which is provided with the hydrophobic template array layer, and drying at 80 ℃ to obtain a conductive layer; the conductive liquid comprises the following components in percentage by mass: 0.5% of nano silver wire (diameter is 30nm, length is 50 μm), 0.5% of nano gold wire (diameter is 5nm, length is 5 μm), 1% of polyvinylpyrrolidone, 50% of deionized water, 48% of ethanol;
s4, preparing a protective solution, coating the protective solution on the surfaces of the conductive layer and the hydrophobic template array layer, and using 500mJ/cm2After UV light curing, drying at 80 ℃ to obtain a protective layer; the protective solution comprises the following components in percentage by mass: 60% of polyurethane acrylic resin, 1.5% of photoinitiator 184, 1.5% of photoinitiator 651, 1% of phenyl o-hydroxybenzoate and 36% of ethyl acetate.
Example 2
The embodiment of the application provides a preparation method of a conductive film, which comprises the following steps:
s1, providing a PET substrate with the thickness of 125 μm;
s2, preparing a hydrophobic template solution, coating the hydrophobic template solution on one side surface of a PET substrate by using a screen printing method, drying for 3min at 80 ℃, and curing for 1h at 120 ℃ to prepare a hydrophobic template array layer; the hydrophobic template liquid comprises the following components in percentage by mass: 50% of acrylic resin, 25% of polyisocyanate, 0.5% of tego-5000, 0.5% of DB310 and 24% of butanone;
s3, preparing a conductive liquid, coating the conductive liquid on one side surface of the PET substrate prepared with the hydrophobic template array layer, and drying at 80 ℃ to obtain a conductive layer; the conductive liquid comprises the following components in percentage by mass: 5% of nano silver wire (diameter of 30nm and length of 50 μm), 1% of single-layer graphene (thickness of 0.5nm and diameter of 5 μm), 1% of carboxymethyl cellulose, 1% of BYK-2020, 46% of ethyl acetate and 46% of ethanol;
s4, preparing a protective solution, coating the protective solution on the surfaces of the conductive layer and the hydrophobic template array layer, drying for 3min at 80 ℃, and curing for 1h at 120 ℃ to obtain a protective layer; the protective solution comprises the following components in percentage by mass: 60% of acrylic resin, 20% of lauroyl peroxide, 0.4% of carboxymethyl cellulose, 0.4% of BYK-300, 0.2% of DB310 and 19% of butyl acetate.
Example 3
The embodiment of the application provides a preparation method of a conductive film, which comprises the following steps:
s1, providing a PET substrate with the thickness of 50 μm;
s2, preparing a hydrophobic template solution, coating the hydrophobic template solution on one side of the PET substrate by using a screen printing method, drying for 3min at 80 ℃, and curing for 1h at 120 ℃ to obtain a hydrophobic template array layer; the hydrophobic template liquid comprises the following components in percentage by mass: 30% of silicone resin, 5% of azobisisobutyronitrile, 1% of BYK-300 and 64% of ethanol;
s3, preparing a conductive liquid, coating the conductive liquid on one side surface of the PET substrate, which is provided with the hydrophobic template array layer, and drying at 80 ℃ to obtain a conductive layer; the conductive liquid comprises the following components in percentage by mass: 0.1% of nano copper wire (diameter is 150nm, length is 35 μm), 0.1% of nano copper powder (diameter is 5 nm), 1.5% of Arabic gum, 0.5% of tego-715w and 97.8% of deionized water;
s4, preparing a protective solution, coating the protective solution on the surfaces of the conductive layer and the hydrophobic template array layer, and using 500mJ/cm2After UV light curing, drying at 80 ℃ to obtain a protective layer; the protective solution comprises the following components in percentage by mass: 20% polyurethane resin, 0.2% TPO, 0.5% carboxymethylcellulose, 0.5% tego-5000, 78.8% isopropanol.
Example 4
The embodiment of the application provides a preparation method of a conductive film, which comprises the following steps:
s1, providing a PET substrate with the thickness of 125 μm;
s2, preparing hydrophobic template liquid, and utilizing screen printingThe method comprises coating hydrophobic template solution on one side of PET substrate at a ratio of 500mJ/cm2After UV light curing, drying at 80 ℃ to obtain a hydrophobic template array layer; the hydrophobic template liquid comprises the following components in percentage by mass: 30% of acrylic resin, 3% of photoinitiator 184, 0.01% of tego-1000, 0.8% of carboxymethyl cellulose and 66.19% of butanone;
s3, preparing a conductive liquid, coating the conductive liquid on one side surface of the PET substrate, which is provided with the hydrophobic template array layer, and drying at 80 ℃ to obtain a conductive layer; the conductive liquid comprises the following components in percentage by mass: 1% of nano silver wire (diameter is 20nm, length is 40 μm), 0.25% of nano silver sheet (thickness is 3nm, diameter is 4 μm), 0.5% of tego-688, 45% of ethanol, 53.25% of isobutanol;
s4, preparing a protective solution, coating the protective solution on the surfaces of the conductive layer and the hydrophobic template array layer, and using 500mJ/cm2After UV light curing, drying at 80 ℃ to obtain a protective layer; the protective solution comprises the following components in percentage by mass: 40% of polyurethane resin, 1% of photoinitiator 184, 1% of photoinitiator 651, 1% of BYK-052 and 57% of ethyl acetate.
Example 5
The embodiment of the application provides a preparation method of a conductive film, which comprises the following steps:
s1, providing a PET substrate with the thickness of 125 μm;
s2, preparing a hydrophobic template solution, coating the hydrophobic template solution on one side of the PET substrate by a screen printing method, and using 500mJ/cm2After UV light curing, drying at 80 ℃ to obtain a hydrophobic template array layer; the hydrophobic template liquid comprises the following components in percentage by mass: 60% of acrylic resin, 3% of photoinitiator TPO, 0.8% of tego-5000, 0.8% of sodium carboxymethyl cellulose, 30% of isopropanol and 5.4% of glycol;
s3, preparing a conductive liquid, coating the conductive liquid on one side surface of the PET substrate, which is provided with the hydrophobic template array layer, and drying at 80 ℃ to obtain a conductive layer; the conductive liquid comprises the following components in percentage by mass: 0.2% of nano copper wires (the diameter is 100nm, and the length is 100 mu m), 0.1% of single-layer graphene oxide (the thickness is 0.5nm, and the diameter is 4 mu m), 0.2% of BYK-014, 1% of sodium carboxymethylcellulose, and 98.5% of deionized water;
s4, preparing a protective solution, coating the protective solution on the surfaces of the conductive layer and the hydrophobic template array layer, drying for 3min at 80 ℃, and curing for 1h at 120 ℃ to obtain a protective layer; the protective solution comprises the following components in percentage by mass: 25% of acrylic resin, 0.5% of lauroyl peroxide, 0.5% of carboxymethyl cellulose, 0.5% of DB310 and 73.5% of butanone.
Comparative example 1
The embodiment of the application provides a preparation method of a conductive film, which comprises the following steps:
s1, providing a PET substrate with the thickness of 125 μm;
s2, preparing a non-hydrophobic template solution, coating the hydrophobic template solution on one side surface of the PET substrate by using a screen printing method, drying for 3min at 80 ℃, and curing for 1h at 120 ℃ to obtain a non-hydrophobic template array layer; wherein the non-hydrophobic template liquid comprises the following components in percentage by mass: 60% of epoxy resin, 15% of amino resin, 1% of defom 5300 and 24% of ethyl acetate;
s3, preparing a conductive liquid, coating the conductive liquid on one side surface of the PET substrate, which is provided with the hydrophobic template array layer, and drying at 80 ℃ to obtain a conductive layer; the conductive liquid comprises the following components in percentage by mass: 2% of nano silver wire (diameter is 18nm, length is 15 μm), 0.5% of tego-688, 97.5% of ethanol;
s4, preparing a protective solution, coating the protective solution on the surfaces of the conductive layer and the hydrophobic template array layer, and using 500mJ/cm2After UV light curing, drying at 80 ℃ to obtain a protective layer; the protective solution comprises the following components in percentage by mass: 40% of polyurethane resin, 1% of photoinitiator 184, 1% of photoinitiator 651, 1% of BYK-052 and 57% of ethyl acetate.
Comparative example 2
The embodiment of the application provides a preparation method of a conductive film, which comprises the following steps:
s1, providing a PET substrate with the thickness of 125 μm;
s2, preparing a hydrophobic template solution, coating the hydrophobic template solution on one side of the PET substrate by using a screen printing method, drying for 3min at 80 ℃, and curing for 1h at 120 ℃ to obtain a hydrophobic template array layer; the hydrophobic template liquid comprises the following components in percentage by mass: 60% of epoxy resin, 15% of polyisocyanate, 0.2% of BYK-331 and 24.8% of ethyl acetate;
s3, preparing a conductive liquid, coating the conductive liquid on one side surface of the PET substrate, which is provided with the hydrophobic template array layer, and drying at 80 ℃ to obtain a conductive layer; the conductive liquid comprises the following components in percentage by mass: 0.5% of nano silver wire (diameter is 30nm, length is 50 μm), 1% of cellulose, 0.5% of BYK-2000, 98% of ethanol;
s4, preparing a protective solution, coating the protective solution on the surfaces of the conductive layer and the hydrophobic template array layer, drying for 3min at 80 ℃, and curing for 1h at 120 ℃ to obtain a protective layer; the protective solution comprises the following components in percentage by mass: 15% of polyurethane resin, 1.5% of lauroyl peroxide, 0.5% of DC163 and 83% of butanone.
The conductive film prepared in example 1 has excellent optical properties, excellent electrical properties and stable aging properties. The conductive film prepared in test example 1 has a transmittance loss of 2%, a transmittance of 89% or more and a haze increase of 2% or less. The sheet resistance of the conductive layer after the conductive layer was prepared in example 1 was measured to be 28. + -. 1. OMEGA.and a xenon lamp was used at 1500W/m2Then, 480h of irradiation is carried out, and the result shows that the sheet resistance change rate is less than or equal to 5 percent.
The conductive film prepared in the embodiment 2 is added with a large amount of conductive nano materials and a part of two-dimensional conductive materials, so that the electrical property is obviously improved, the optical property is reduced compared with that of the conductive film prepared in the embodiment 1, and the aging property is stable; the conductive film prepared in the test example 2 has the transmittance loss within 10%, the transmittance of the whole conductive film is more than 80%, and the haze increase is less than 4%. The sheet resistance of the conductive layer prepared in example 1 was measured to be 8. + -. 1. omega. and a xenon lamp was used at 1500W/m2Under, irradiating480h, and the result shows that the sheet resistance change rate is less than or equal to 5 percent.
The conductive film prepared in the embodiment 3 has the advantages that the addition of the conductive nano material is reduced, the optical performance is obviously improved, the electrical performance is reduced compared with that of the conductive film prepared in the embodiment 1, and the aging performance is stable. The conductive film prepared in test example 3 has a transmittance loss of 0.2% or less, a transmittance of 90% or more and a haze increase of 1% or less. The sheet resistance of the conductive layer prepared in example 3 was measured to be 60. + -. 5. omega. and a xenon lamp was used at 1500W/m2Then, 480h of irradiation is carried out, and the result shows that the sheet resistance change rate is less than or equal to 5 percent. In the method for preparing the conductive film in embodiment 3, the nano copper material with a relatively low price is used, and the usage amount is relatively low, so that the material cost can be greatly reduced, and the conductive film with excellent optical performance can be obtained.
The conductive film prepared in the embodiment 4 has a certain amount of reduced cost due to the reduced content of the main resin in the hydrophobic template liquid and the reduced content of the anti-fouling additive, and compared with the conductive film prepared in the embodiment 1, the conductive film has approximate electrical property and optical property, but has some loss of aging property; the conductive film prepared in the test example 4 has the transmittance loss within 2%, the transmittance of the whole conductive film is more than 89%, and the haze increase is less than 2%. The sheet resistance of the conductive layer after preparation in example 4 was tested to 30. + -. 1. omega. and a xenon lamp was used at 1500W/m2Then, 480h of irradiation is carried out, and the result shows that the sheet resistance change rate is less than or equal to 25 percent.
The conductive film prepared in the embodiment 5 has the advantages that the content of the nano material in the conductive liquid is reduced, the content of the resin and the curing agent in the protective liquid is reduced, the cost is effectively reduced, and compared with the conductive film prepared in the embodiment 1, the conductive film has slightly poor electrical properties and better optical properties, but the aging performance is lost; the conductive film prepared in test example 5 has a transmittance loss of 0.5% or less, a transmittance of 90% or more and a haze increase of 1% or less. The sheet resistance of the conductive layer after preparation in example 5 was tested to 45. + -. 1. omega. and a xenon lamp was used at 1500W/m2Then, 480h of irradiation is carried out, and the result shows that the sheet resistance change rate is less than or equal to 25 percent.
Compared with the conductive film prepared in the example 1, the conductive film prepared in the comparative example 1 has approximate optical performance due to the use of the non-hydrophobic template liquid, but is easy to generate short circuit phenomenon, and the aging performance is lost; the transmittance loss of the conductive film prepared in the comparative example 1 is within 2%, the transmittance of the whole conductive film is more than 89%, and the haze increase is less than 2%. The sheet resistance of the conductive layer was tested after the conductive layer was prepared in comparative example 1, and the test result was 25. + -.1. OMEGA, but 75% of the conductive layer was short-circuited and could not be used, and among the conductive layers that could be used, a xenon lamp was used at 1500W/m2Then, 480h of irradiation showed that the sheet resistance change rate was 50% or less and the short circuit phenomenon still further occurred.
The conductive film prepared in the comparative example 2 uses a smaller amount of resin in the protective solution, so that the obtained protective film is very thin, the cost can be reduced, and the thickness can be reduced, compared with the conductive film prepared in the example 1, the optical performance is close, the electrical performance is close, but the aging performance is obviously reduced; the conductive film prepared in the test comparative example 2 has the transmittance loss within 2%, the transmittance of the whole conductive film is more than 89%, and the haze increment is less than 2%. The sheet resistance was measured after the conductive layer was prepared in comparative example 2, and the measurement result was 32. + -.1. omega. using a xenon lamp at 1500W/m2Then, 480h of irradiation shows that 80% of the conductive film can not detect the sheet resistance, and the rest can detect that the change rate of the sheet resistance is less than or equal to 90%.
In summary, the conductive film prepared by the method of embodiment 1 has the best overall performance.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (1)
1. A method for producing a conductive film, the conductive film comprising:
a substrate;
a hydrophobic template array layer located on one side of the substrate;
the conducting layer is positioned on one side surface of the substrate and positioned between the adjacent hydrophobic templates;
the protective layer covers the hydrophobic template array layer and one side of the conducting layer, which is far away from the substrate; the base material is a PET base material with the thickness of 125 mu m;
the preparation method of the conducting film comprises the following steps:
s1, providing a PET substrate with the thickness of 125 μm;
s2, preparing a hydrophobic template solution, coating the hydrophobic template solution on one side of the PET substrate by a screen printing method, and using 500mJ/cm2After UV light curing, drying at 80 ℃ to obtain a hydrophobic template array layer; the hydrophobic template liquid comprises the following components in percentage by mass: 60% of polyurethane acrylic resin, 1.5% of photoinitiator 184, 1.5% of photoinitiator 651, 0.2% of tego-5000, 0.6% of polyvinylpyrrolidone, 0.2% of BYK-054 and 36% of ethyl acetate;
s3, preparing a conductive liquid, coating the conductive liquid on one side surface of the PET substrate, which is provided with the hydrophobic template array layer, and drying at 80 ℃ to obtain a conductive layer; the conductive liquid comprises the following components in percentage by mass: 0.5% of nano silver wire, 0.5% of nano gold wire, 1% of polyvinylpyrrolidone, 50% of deionized water and 48% of ethanol; the diameter of the nano silver wire is 30nm, and the length of the nano silver wire is 50 mu m; the diameter of the nano gold wire is 5nm, and the length of the nano gold wire is 5 mu m;
s4, preparing a protective solution, coating the protective solution on the surfaces of the conductive layer and the hydrophobic template array layer, and using 500mJ/cm2After UV light curing, drying at 80 ℃ to obtain a protective layer; the protective solution comprises the following components in percentage by mass: 60% of polyurethane acrylic resin, 1.5% of photoinitiator 184, 1.5% of photoinitiator 651, 1% of phenyl o-hydroxybenzoate and 36% of ethyl acetate.
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