Optical high-flexibility conductive glass film and preparation method thereof
Technical Field
The invention relates to a glass film, in particular to an optical high-flexibility conductive glass film and a preparation method thereof.
Background
A glass film is a film with optical or other functional effects that is applied over glass. With the development of the electronic industry, the transparent conductive film glass film is a thin film with good conductivity and high light transmittance in a visible light band, and the transparent conductive film is widely applied to the fields of flat panel display, photovoltaic devices, touch panels, electromagnetic shielding and the like at present, and has extremely wide application prospects. Generally, the optical transmission performance and the electrical conductivity of the transparent conductive glass film are two main properties of the transparent conductive glass film.
At present, a transparent conductive film includes a transparent substrate and a conductive layer disposed on the transparent substrate, and an ITO (indium tin oxide) layer is a main material of the conductive layer in the transparent conductive film, however, a conventional ITO film cannot be used for flexible applications, and essential problems such as conductivity and light transmittance are not easily overcome, and many panel manufacturers are beginning to research a substitute for ITO.
The novel technologies of the nano silver wire, the graphene, the metal grid and the like are in the development stage at present, for example, the transparency of the nano silver wire can be improved, the preparation and adhesion difficulty of a specific interface of the graphene is high, and the metal grid has the problem of interference ripple.
In view of the above problems, the present invention has been made to overcome the above problems by developing an optically highly flexible conductive glass film having excellent electrical conductivity and optical transparency.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides an optical high-flexibility conductive glass film, which aims to obtain a conductive glass film with good optical performance and conductivity and flexible mechanical property, and solves the problems in the prior art.
The invention content is as follows: the utility model provides a high flexible electrically conductive glass membrane of optics includes protective layer, last glue film, scratch-resistant layer, electrically conductive composite bed in proper order, from the type glue film, from the type layer from outside to inside, electrically conductive composite bed includes electrically conductive rete, electrically conductive glue film in proper order from outside to inside, and electrically conductive rete includes main part conducting film and the metal grid layer of embedding in the main part conducting film, the main part conducting film is formed by electrically conductive thick liquid coating, the raw materials of electrically conductive thick liquid contain the component of following part by weight:
preferably, the upper glue layer is made of silica gel glue. The silica gel glue has the characteristics of strong adhesive force, good wettability with each interface and the like, and has high universality value when being used as high-quality glue for adhering a tearing layer.
Preferably, the release layer and the scratch-resistant layer are made of one of a PET film and a PC film. The PET film and the PC film have high transparency, are suitable as release layers needing to be peeled, and have a certain scratch-resistant protection effect as scratch-resistant layers.
Preferably, the silver nanowire dispersion is a dispersion of silver nanowires in water, ethanol or isopropanol, the diameter of the silver nanowires is 30-100nm, and the length of the silver nanowires is 5-100 μm. The silver nanowire dispersoid has non-trivial effects, has high conductivity, and plays a role in conducting the film layer and mixing the film layer with other components of the conductive paste to form a film; the length and the diameter of the conductive material enable the conductive performance of the conductive material to be fully exerted.
Preferably, the material of the metal grid layer is one of copper, silver, gold, chromium-gold, titanium-palladium-gold, titanium-platinum-gold and titanium-copper-gold. The metal grid layer is made of a material with the characteristics of high conductivity, mechanical flexibility in class bending and the like.
Preferably, the mixed solvent includes a combination of at least two of saturated alcohols, ketones, and esters having 4 to 9 carbon atoms. The mixed solvent enables the system of the conductive paste to be mixed and homogenized.
Preferably, the conductive adhesive layer is formed by coating conductive adhesive, and the raw materials of the conductive adhesive comprise the following components in parts by weight:
a preparation method of an optical high-flexibility conductive glass film comprises the following steps:
(1) adding the silver nanowire dispersion, alkylphenol ethoxylates, ethylene glycol phenyl ether, acrylic resin monomer, diethylenetriamine, oligosaccharide, sodium carboxymethylcellulose and a mixed solvent into a vacuum stirrer according to a formula ratio, defoaming in vacuum, and uniformly stirring to obtain a solution A, placing the solution A into a high-speed stirrer, adding cyano phosphate and a thickening agent into the solution A, stirring at 500-800rpm for 5-15min to obtain conductive paste, wherein the concentration of silver nanowires in the conductive paste is 15-60mg/m L;
(2) coating the prepared conductive paste on the anti-scraping layer, drying, coating again and drying, repeating the steps for 2-4 times, temporarily not drying after the last coating, pressing by using a grid graver to form a metal grid groove, and drying to form a main conductive film with the thickness of 20-400 mu m in total;
(3) at 3 to 5 × 10-3Plating a metal material used for the metal grid at the position of a groove of the metal grid by adopting an evaporation method under the vacuum degree of Pa, and filling the groove of the metal grid to form a metal grid layer, wherein the total thickness of the metal grid layer is slightly larger than the depth of the groove of the metal grid, and the width of a grid metal line of the metal grid layer is not more than 3 mu m; repairing the surfaces of the metal grid layer and the main conductive film to be flat;
(4) preparing a conductive adhesive according to a formula, coating the conductive adhesive on the surfaces of the main conductive film and the metal grid layer, and forming a conductive adhesive layer with the coating thickness of 50-500 mu m;
(5) coating a prepared release adhesive on the conductive adhesive layer, and attaching a release film; and similarly, coating the silica gel glue of the glue coating layer on the anti-scraping layer and then pasting the protective layer to obtain the anti-scraping glue.
The invention has the beneficial effects that: the optical high-flexibility conductive glass film disclosed by the invention is fine and reasonable in formula, obvious in structural hierarchy and excellent in conductivity. The upper protective layer, the upper adhesive layer, the release adhesive layer and the release layer are used for uncovering the protective layer of the main body layer and play an important role in protection and sealing; the scratch-resistant layer plays the most basic protection role, the conductive composite layer has a special structure and comprises a main framework conductive film layer and a conductive adhesive layer in contact with an application surface, and the combination of the nano silver wire formula of the conductive film layer and the metal grid layer is uniquely combined with the current optional path of the high-efficiency conductive film for replacing ITO, so that the conductivity is fully improved. The conductive paste and the conductive adhesive have unique formulas, and are good at combining the advantages of the nano silver wires and the metal grid layer to carry out architectural design, so that the square resistance is greatly reduced, and the application value of the scheme of replacing the conductive film by the ITO is improved.
Drawings
Fig. 1 is a schematic structural level diagram of the present invention, and fig. 2 is a schematic structural level diagram of the main conductive film, the metal mesh layer, and the conductive adhesive layer of the present invention.
In the figure: 1-upper protective layer, 2-upper adhesive layer, 3-anti-scratch layer, 4-conductive composite layer, 41-main conductive film, 42-metal grid layer, 43-conductive adhesive layer, 5-release adhesive layer and 6-release layer.
Detailed Description
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the embodiments.
Examples 1 to 5
As shown in fig. 1-2, an optical high-flexibility conductive glass film, in which the right side is outside and the left side is inside, the right side and the left side are inside, the upper protective layer 1, the upper adhesive layer 2, the scratch-resistant layer 3, the conductive composite layer 4, the release layer 5 and the release layer 6 are sequentially included from outside to inside, the upper adhesive layer 2 adopts silica gel glue, the release layer 5 and the scratch-resistant layer 3 are made of one of PET films and PC films, preferably PET films, the conductive composite layer 4 sequentially includes a conductive film layer and a conductive adhesive layer 43 from outside to inside, the conductive film layer includes a main conductive film 41 and a metal mesh layer 42 embedded in the main conductive film 41, the main conductive film 41 is formed by coating conductive paste, and the conductive adhesive layer 43 is formed by coating conductive adhesive;
the metal grid layer 42 is made of one of copper, silver, gold, chromium-gold, titanium-palladium-gold, titanium-platinum-gold and titanium-copper-gold;
the raw materials of the conductive paste and the raw materials of the conductive adhesive comprise the components in parts by weight according to the examples in the table 1.
TABLE 1 Components of the examples (unit: parts by weight)
The silver nanowire dispersion is a dispersion liquid of silver nanowires in water, ethanol or isopropanol, the diameters of the silver nanowires are 80nm in example 1, 67nm in example 2, 88nm in example 3, 90nm in example 4, 71nm in example 5, and the lengths of the silver nanowires are 80, 70, 90, 100 and 75 micrometers in examples 1-5 respectively; the mixed solvent comprises at least two component combinations of saturated alcohols, ketones and esters with 4-9 carbon atoms, and the best component combination is the combination of three components.
A preparation method of an optical high-flexibility conductive glass film comprises the following steps:
(1) adding the silver nanowire dispersion, alkylphenol ethoxylates, ethylene glycol phenyl ether, acrylic resin monomer, diethylenetriamine, oligosaccharide, sodium carboxymethylcellulose and a mixed solvent into a vacuum stirrer according to a formula ratio, defoaming in vacuum, and uniformly stirring to obtain a solution A, placing the solution A into a high-speed stirrer, adding cyano phosphate and a thickening agent into the solution A, stirring at 500-800rpm for 5-15min to obtain conductive paste, wherein the concentration of silver nanowires in the conductive paste is 15-60mg/m L;
(2) coating the prepared conductive paste on the anti-scraping layer, drying, coating again and drying, repeating the steps for 2-4 times, temporarily not drying after the last coating, pressing by using a grid graver to form a metal grid groove, and drying to form a main conductive film with the thickness of 20-400 mu m in total; the thicknesses of the main body conductive films in the embodiments 1 to 5 are respectively 201, 176, 127, 165 and 230 μm;
(3) at 3 to 5 × 10-3Under the vacuum degree of Pa, plating the metal material for the metal grid on the groove position of the metal grid by adopting an evaporation plating method, and filling the groove of the metal grid to form the metal gridThe total thickness of the metal grid layer is slightly larger than the depth of the metal grid groove, and the grid metal line width of the metal grid layer is not more than 3 mu m; repairing the surfaces of the metal grid layer and the main conductive film to be flat;
(4) preparing a conductive adhesive according to a formula, coating the conductive adhesive on the surfaces of the main conductive film and the metal grid layer, and forming a conductive adhesive layer with the coating thickness of 50-500 mu m; the coating thicknesses of the conductive adhesive in the embodiments 1 to 5 are respectively 131 μm, 152 μm, 205 μm, 172 μm and 98 μm;
(5) coating a prepared release adhesive on the conductive adhesive layer, and attaching a release film; and similarly, coating the silica gel glue of the glue coating layer on the anti-scraping layer and then pasting the protective layer to obtain the anti-scraping glue.
The results of the basic performance tests on the conductive composite layer of the obtained optical high-flexibility conductive glass film are shown in table 2.
TABLE 2 basic Performance index of the examples
In conclusion, the optical high-flexibility conductive glass film has excellent visible light transmittance and small sheet resistance.
The above embodiments are only intended to illustrate the preferred embodiments of the present invention, and it should be noted that, for those skilled in the art, various modifications and equivalent substitutions can be made without departing from the principle of the present invention, and the scope of the present invention is still covered by the claims.