阅读说明：本技术 一种导电pet触控屏膜及其制备方法 (Conductive PET touch screen film and preparation method thereof ) 是由 樊祥通 于 2018-06-30 设计创作，主要内容包括：本发明公布了一种导电PET触控屏膜及其制备方法,所述导电PET触控屏膜由外到内为保护层、银导电层、粘结剂层、PET基底层,所述、银导电层组成为银纳米线0.2-1.5%,氟碳表面活性剂0.005-0.05%,分散剂0.1-2%,乙二醇二丁醚1-3%,乙二醇2-5%,2-己基乙醇1-2%,余量为有机醇类溶剂；该薄膜的性能优越,材料易得,导电性能良好。(The invention discloses a conductive PET touch screen film and a preparation method thereof, wherein the conductive PET touch screen film comprises a protective layer, a silver conductive layer, a binder layer and a PET substrate layer from outside to inside, wherein the silver conductive layer comprises 0.2-1.5% of silver nanowires, 0.005-0.05% of fluorocarbon surfactant, 0.1-2% of dispersant, 1-3% of ethylene glycol dibutyl ether, 2-5% of ethylene glycol, 1-2% of 2-hexylethanol and the balance of organic alcohol solvent; the film has excellent performance, easily obtained materials and good conductivity.)

1. The conductive PET touch screen film is characterized by being of a four-layer structure and sequentially comprising a PEDOT protective layer, a silver conductive layer, a binder layer and a PET substrate layer, wherein the silver conductive layer comprises, by mass, 0.2-1.5% of silver nanowires, 0.005-0.05% of fluorocarbon surfactant, 0.1-2% of dispersant, 1-3% of ethylene glycol dibutyl ether, 2-5% of ethylene glycol, 1-2% of 2-hexylethanol and the balance of organic alcohol solvent, and the thickness of the silver conductive layer is 120 ~ 150 nm.

2. The conductive PET touch screen film of claim 1, wherein: the silver nanowires have the particle size of 25-45nm and the length of 10-20 mu m.

3. The conductive PET touch screen film of claim 1, wherein: the organic alcohol solvent is methanol, ethanol or isopropanol.

4. The preparation method of the conductive PET touch screen film according to claim 1, which comprises the following steps:

coating a layer of adhesive solution on a PET substrate layer, and drying to obtain an adhesive, wherein the drying mode is infrared baking for 5 ~ 8 minutes, and then vacuum drying for 5 ~ 8 minutes at 95 ~ 105 ℃ under the temperature of 95 ~ ℃;

b, preparing a silver conductive layer according to the mass percentage, stirring for 20 ~ 30 minutes, coating the silver conductive layer on a binder layer, and drying to obtain a silver conductive network, wherein the drying mode is infrared baking for 5 ~ 8 minutes, and then vacuum drying for 10 ~ 15 minutes at 105 ~ 115 ℃;

and c, finally coating a PEDOT protective layer, and drying to obtain the conductive PET touch screen film, wherein the drying mode is that the conductive PET touch screen film is subjected to infrared baking for 5 ~ 8 minutes, and then is subjected to vacuum drying at 105 ~ 115 ℃ for 10 ~ 15 minutes.

Technical Field

The invention belongs to the technical field of films, and particularly relates to a conductive PET touch screen film and a preparation method thereof.

Background

ITO as nanometer indium tin oxide has good conductivity and transparency, and can cut off harmful electron radiation, ultraviolet ray and far infrared ray. Therefore, indium tin oxide is generally sprayed on glass, plastic and electronic display panels to serve as a transparent conductive film while reducing electron radiation and ultraviolet and infrared rays harmful to the human body.

Among the oxide conductive films, Sn-doped In2O3(ITO) film has the highest transmittance and the best conductivity, and is easily etched into a fine pattern In an acid solution, wherein the light transmittance is 90% or more. The transmittance and resistance of ITO are controlled by the ratio of In2O3 to SnO2, usually SnO2: In2O3=1: 9.

The resistivity of the ITO film is about 5 × 10E-4, preferably 5 × 10E-5, which is close to the resistivity of metal, and In practical application, the conductivity of ITO is represented by a bulk resistor, the transmittance is over 90%, the transmittance and resistance of the ITO film are controlled by the ratio of In2O3 to SnO2, and the transmittance of ITO can be improved by increasing the ratio of indium oxide.

Currently, Indium Tin Oxide (ITO) is the most commonly used electrode conductive material in the consumer electronics field, such as touch screens. However, the rare content of indium causes the yield to be limited and the price to be higher; at the same time, the complex equipment required for its preparation, as well as the high temperatures, and its inherent brittleness, make ITO unsuitable for use in constructing flexible substrates. The ever-increasing market for flexible products, such as wearable devices, has led to an increasing demand for flexible substrates. Therefore, it is very important to develop a material that can realize a flexible conductive substrate. Among materials that can realize a flexible substrate, silver nanowires are the most recently commercialized materials, and thus research thereof is receiving attention.

To realize the utilization of the silver nanowires, the silver nanowires should be firstly prepared into silver conductive ink with excellent performance. To solve the problem of incorporating a variety of adjuvants to improve ink performance, there has been little work in formulating inks that can be removed by simple handling.

In conclusion, how to simultaneously maintain the easy removal of the ink auxiliary agent and the good bonding force between the silver conductive network and the substrate is a precondition for realizing a high-performance conductive film, and is also a problem to be solved in the field of transparent conductive ink and films.

Disclosure of Invention

In order to solve the technical problems, the invention provides a technical method for a conductive PET touch screen film and a preparation method thereof, and the technical method comprises the following steps: the silver conducting layer comprises the following components in percentage by mass: 0.2-1.5% of silver nanowire, 0.005-0.05% of fluorocarbon surfactant, 0.1-2% of dispersant, 1-3% of ethylene glycol dibutyl ether, 2-5% of ethylene glycol, 1-2% of 2-hexyl ethanol and the balance of organic alcohol solvent.

Preferably, the silver nanowires have a particle size of 25-45nm and a length of 10-20 μm.

Preferably, the organic alcohol solvent is methanol, ethanol or isopropanol.

Preferably, the thickness of the silver conductive layer is 120 ~ 150 nm.

Preferably, the preparation method of the conductive PET touch screen film comprises the following steps:

coating a layer of adhesive solution on a PET substrate layer, and drying to obtain an adhesive, wherein the drying mode is infrared baking for 5 ~ 8 minutes, and then vacuum drying for 5 ~ 8 minutes at 95 ~ 105 ℃ under the temperature of 95 ~ ℃;

b, preparing a silver conductive layer according to the mass percentage, stirring for 20 ~ 30 minutes, coating the silver conductive layer on a binder layer, and drying to obtain a silver conductive network, wherein the drying mode is infrared baking for 5 ~ 8 minutes, and then vacuum drying for 10 ~ 15 minutes at 105 ~ 115 ℃;

and c, finally coating a PEDOT protective layer, and drying to obtain the conductive PET touch screen film, wherein the drying mode is that the conductive PET touch screen film is subjected to infrared baking for 5 ~ 8 minutes, and then is subjected to vacuum drying at 105 ~ 115 ℃ for 10 ~ 15 minutes.

The invention has the following beneficial effects: the silver conductive layer has good coating effect, and the film is conductive uniformly; the film has better performances such as conductivity, light transmittance and the like; the conductive film has lasting service time and smaller haze; cheap raw materials, simple film preparation process and low cost.

Detailed Description