Transparent electrically-conductive thin film

Abstract

A transparent electrically-conductive thin film. The thin film comprises: a transparent substrate layer, and an electrically-conductive layer located on a surface of the transparent substrate layer, wherein the electrically-conductive layer is obtained by means of coating and drying an electrically-conductive liquid. The electrically-conductive liquid is composed of the following components in parts by weight: 100 parts of a solvent, 10-15 parts of silver nanowires, 2-5 parts of a polyvinyl butyral, 1-3 parts of a polyvinylpyrrolidone, 0.1-0.5 parts of a dispersing agent, 0.3-1.5 parts of a silane coupling agent, 0.1-1 part of a leveling agent and 0.2-0.6 parts of a polycitric acid, wherein the silver nanowires have a diameter of 30-50 nm and a length of 15-30 μm. The transparent electrically-conductive thin film maintains a low surface resistance, and also reduces the yellowness value of the thin film, thereby ensuring stable light transmittance and the appearance effect of the transparent electrically-conductive thin film.

Description

Transparent conductive film Technical Field

[0001] The present invention relates to the technical field of conductive films, and in particular to a transparent conductive film. Background Art

[0002] As a functional film with high light transmittance and low sheet resistance, transparent conductive film is widely used in touch screens, display panels, electromagnetic shielding, LED displays, electroluminescent devices, and thin-film solar cells.

[0003] Due to the shortcomings of existing transparent conductive films, such as resource shortages, high costs, and susceptibility to defects, those skilled in the art are currently committed to developing new alternative materials for use in transparent conductive films. Among these, metal nanomaterials, particularly nanosilver, have become the most promising alternatives for commercialization. However, existing nanosilver transparent conductive films tend to yellow after prolonged use, affecting their light transmittance. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a transparent conductive film which, while maintaining low surface resistance, also reduces the yellowness value of the film, thereby ensuring the transmittance stability and appearance effect of the transparent conductive film.

[0005] To achieve the above-mentioned object, the present invention adopts a technical solution: a transparent conductive film comprising: a transparent substrate layer; a conductive layer located on the surface of the transparent substrate layer; the conductive layer is obtained by coating and drying a conductive liquid; the conductive liquid comprises the following components in parts by weight:

[0006] 100 parts of solvent,

[0007] 10-15 parts of silver nanowires,

[0008] 2~5 parts of polyvinyl butyral,

[0009] 1 to 3 parts of polyvinyl pyrrolidone,

[0010] 0.1~0.5 parts of dispersant,

[0011] Silane coupling agent 0.3~1.5 parts,

[0012] 0.1~1 part of leveling agent,

[0013] 0.2-0.6 parts of polycitric acid;

[0014] The silver nanowires have a diameter of 30-50 nm and a length of 15-30 μm.

[0015] The technical solutions further improved in the above technical solutions are as follows:

[0016] 1. In the above solution, the transparent substrate layer is a PET substrate layer, a PE substrate layer, a PP substrate layer or a PI substrate layer.

[0017] 2. In the above scheme, the solvent is methanol, ethanol or isopropanol.

[0018] 3. In the above scheme, the leveling agent is isopropyl alcohol, propylene glycol methyl ether, diacetone alcohol or ethylene glycol butyl ether.

[0019] 4. In the above scheme, the dispersant is 2-amino-2-methyl-1-propanol, ethanolamine, and diethyl phthalate.

[0020] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0021] The transparent conductive film of the present invention has a conductive layer composed of 10 to 15 parts of silver nanowires and 2 to 5 parts of polyvinyl butyral, with 1 to 3 parts of polyvinyl pyrrolidone and 0.2 to 0.6 parts of polycitric acid added thereto. This allows the transparent conductive film to maintain low surface resistance while also reducing the yellowness value of the film, thereby ensuring the transmittance stability and appearance of the transparent conductive film. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a schematic structural diagram of the transparent conductive film of the present invention.

[0023] In the above figures: 1. transparent substrate layer; 2. conductive layer. DETAILED DESCRIPTION

[0024] The present invention can be further understood through the specific embodiments given below, but they are not intended to limit the present invention.

[0025] The present invention will be further described below in conjunction with the embodiments:

[0026] Examples 1-4: A transparent conductive film comprising: a transparent substrate layer 1; a conductive layer 2 located on the surface of the transparent substrate layer 1; the conductive layer 2 being obtained by coating and drying a conductive liquid; the conductive liquid comprising the following components in parts by weight, as described in Table 1:

[0027] Table 1

[0028] Components Example 1 Example 2 Example 3 Example 4 Solvent 100 parts 100 parts 100 parts 100 parts Silver nanowires 12 parts 10 parts 12 parts 14 parts Polyvinyl butyral 3 parts 5 parts 3 parts 4 parts Polyvinyl pyrrolidone 2 parts 1 part 2 parts 2 parts Dispersant 0.3 parts 0.2 parts 0.3 parts 0.2 parts Silane coupling agent 1 part 0.7 parts 1 part 0.6 parts Leveling agent 0.5 parts 0.6 parts 0.4 parts 0.4 parts Polycitric acid 0.3 parts 0.2 parts 0.2 parts 0.3 parts

[0029] ;

[0030] The silver nanowires have a diameter of 30-50 nm and a length of 15-30 μm.

[0031] In Example 1, the transparent substrate layer is a PET substrate layer, the solvent is methanol, the leveling agent is propylene glycol methyl ether, and the dispersant is diethyl phthalate.

[0032] In Example 2, the transparent substrate layer is a PP substrate layer, the solvent is methanol, the leveling agent is propylene glycol methyl ether, and the dispersant is 2-amino-2-methyl-1-propanol.

[0033] In Example 3, the transparent substrate layer is a PET substrate layer, the solvent is methanol, the leveling agent is isopropyl alcohol, and the dispersant is 2-amino-2-methyl-1-propanol.

[0034] In Example 4, the transparent substrate layer is a PP substrate layer, the solvent is ethanol, the leveling agent is ethylene glycol butyl ether, and the dispersant is diethyl phthalate.

[0035] A process for preparing the transparent conductive film comprises the following steps:

[0036] Step 1: silver nanowires, polyvinyl butyral, polyvinyl pyrrolidone, a dispersant, a silane coupling agent, a leveling agent, and polycitric acid are sequentially added to a solvent and stirred magnetically to form a uniform mixed solution, and then allowed to stand for 1 to 2 hours. The silver nanowires have a diameter of 30 to 50 nm and a length of 15 to 30 μm.

[0037] Step 2: performing corona treatment on the transparent substrate layer by plasma;

[0038] Step 3: statically coat the surface of the transparent substrate layer after corona treatment, and dry it at 50° C. to obtain a transparent conductive film.

[0039] The drying time in the above step 3 is 50 minutes.

[0040] Comparative Examples 1-3: A transparent conductive film comprising: a transparent substrate layer 1; a conductive layer 2 located on the surface of the transparent substrate layer 1; the conductive layer 2 being obtained by coating and drying a conductive liquid; the conductive liquid comprising the following components in parts by weight, as described in Table 2:

[0041] Table 2

[0042] Components Comparative Example 1 Comparative Example 2 Comparative Example 3 Solvent 100 parts 100 parts 100 parts Silver nanowires 12 parts 12 parts 12 parts Polyvinyl butyral 3 parts 3 parts 3 parts Polyvinyl pyrrolidone -2 parts - Dispersant 0.3 parts 0.3 parts 0.3 parts Silane coupling agent 1 part 1 part 1 part Leveling agent 0.5 parts 0.5 parts 0.4 parts Polycitric acid 0.3 parts -

[0043] ;

[0044] The silver nanowires have a diameter of 30-50 nm and a length of 15-30 μm.

[0045] In Comparative Examples 1 and 2, the transparent substrate layer is a PET substrate layer, the solvent is methanol, the leveling agent is propylene glycol methyl ether, and the dispersant is diethyl phthalate.

[0046] In Comparative Example 3, the transparent substrate layer is a PP substrate layer, the solvent is methanol, the leveling agent is propylene glycol methyl ether, and the dispersant is 2-amino-2-methyl-1-propanol.

[0047] The preparation process steps of the comparative example are the same as those of the embodiment.

[0048] The transparent conductive films obtained in Examples 1 to 4 and Comparative Examples 1 to 3 were tested for surface resistance using a four-probe instrument, and their yellowness values ​​were measured using a HunterLab colorimeter. The samples were irradiated with an ultraviolet lamp for 10 minutes before measuring the yellowness values. The corresponding properties are shown in Table 3:

[0049] Table 3

[0050] Square resistance / Ω / □ Yellowness value / B Example 1 1731.672 Example 2 1831.714 Example 3 1821.753 Example 4 1761.681 Comparative Example 1 1961.932 Comparative Example 2 2012.023 Comparative Example 3 1921.911

[0051] ;

[0052] As shown in the evaluation results in Table 3, the transparent conductive films obtained in Examples 1-4 of the present invention had sheet resistances / Ω / □ less than 185Ω / □ and yellowness values ​​of 1.672, 1.714, 1.753, and 1.681, respectively. The transparent conductive films of Comparative Examples 1-3 had sheet resistances greater than 190Ω / □ and yellowness values ​​exceeding 1.9. While maintaining low sheet resistance, the transparent conductive films of this embodiment also reduced their yellowness, ensuring stable transmittance and excellent appearance.

[0053] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be covered by the scope of protection of the present invention.

[0054]

Claims

1. A transparent conductive film, characterized in that: include: A transparent substrate layer (1), and a conductive layer (2) located on the surface of the transparent substrate layer (1), wherein the conductive layer (2) is obtained by coating and drying a conductive liquid, wherein the conductive liquid comprises the following components in parts by weight: 100 parts of solvent, 10~15 parts of silver nanowires, 2~5 parts of polyvinyl butyral, 1-3 parts of polyvinyl pyrrolidone, Dispersant 0.1~0.5 parts, Silane coupling agent 0.3~1.5 parts, Leveling agent 0.1~1 part, Polycitric acid 0.2~0.6 parts; The silver nanowire has a diameter of 30-50 nm and a length of 15-30 μm.

2. The transparent conductive film according to claim 1, wherein: The transparent substrate layer is a PET substrate layer, a PE substrate layer, a PP substrate layer or a PI substrate layer.

3. The transparent conductive film according to claim 1, wherein: The solvent is methanol, ethanol or isopropanol.

4. The transparent conductive film according to claim 1, wherein: The leveling agent is isopropyl alcohol, propylene glycol methyl ether, diacetone alcohol or ethylene glycol butyl ether.

5. The transparent conductive film according to claim 1, wherein: The dispersant is 2-amino-2-methyl-1-propanol, ethanolamine and diethyl phthalate.

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