WO2014121456A1

WO2014121456A1 - Conductive material for capacitive touch screen, capacitive touch screen and preparation method thereof

Info

Publication number: WO2014121456A1
Application number: PCT/CN2013/071419
Authority: WO
Inventors: 周忠
Original assignee: 深圳市海富莱电子有限公司
Priority date: 2013-02-06
Filing date: 2013-02-06
Publication date: 2014-08-14

Abstract

Disclosed in the present invention are a conductive material for capacitive touch screen, preparation method of capacitive touch screen and capacitive touch screen. The conductive material comprises the following components in percentage by weight: 60-97% of organic conductive polymer, 0.4-25% of film-forming resin, 2-15% of polar solvent with high boiling point and 0.1-1.5% of surfactant. According to the conductive material for capacitive touch screen disclosed by the present invention, the organic conductive polymer is used as the base material, and by means of the synergistic effect of the added film-forming resin and the polar solvent with high boiling point, the chromatic aberration of a conductive functional pattern formed by the conductive material by etching is small, and the conductive stability and transmittance are high. In addition, the sensitivity to light of the organic conductive polymer is also reinforced. The capacitive touch screen contains the conductive material for capacitive touch screen, the conductive material can be prepared into a functional pattern layer by etching or printing, and the preparation method is simple in process, easy to control conditions, low in cost, low in requirements on equipment and suitable for industrial production.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of touch screen technologies, and in particular to a conductive material for a capacitive touch screen, a capacitive touch screen, and a method of fabricating the same. Background technique

With the increasing popularity of computer and network technologies, the rapid development of the electronics industry requires continuous improvement in the technology for printing and manufacturing electronic devices and the preparation of flexible electronic devices, thereby driving the process of preparing electronic devices by various methods such as printing, coating and etching. Growing. Materials compatible with such processes: Conductive materials such as silver paste, aluminum paste, carbon paste, high molecular polymer, carbon nanotubes, etc. are constantly emerging.

Currently known conductive materials are limited in many aspects in practical applications due to their own characteristics and defects in patterning techniques. For example: Graphical with aluminum paste and silver paste, the opaque properties of silver paste and aluminum paste limit its use. Another example: Although the conductive coating of carbon nanotubes has good permeability to visible light, its characteristics determine that its patterning can only be formed by laser or printing. After the graphics are formed, the color difference between the graphics cannot satisfy the actual application.

Due to the inherent defects of the above inorganic materials, organic conductive polymer materials are beginning to be used in the field of touch screens. With the development of conductive polymer technology, touch screens using organic conductive polymers instead of conventional indium tin oxide (ITO) as transparent electrodes have emerged. Compared with ITO, organic conductive polymers have a series of advantages, for example, they are softer than ITO films, are less prone to micro cracks, and have a longer service life; they can be directly coated on a substrate, in air, and Having a ratio

The film forming properties of ITO at lower temperature conditions have higher mass production ability. In addition, combined touch The screen substrate can be used to prepare a flexible touch screen, realize bending deformation, and the like, and is applied in more fields. Therefore, the replacement of ITO as a conductive material for a touch screen by a conductive polymer will cause a revolution in the development of touch screens.

However, the widespread use of organic conductive polymers on touch screens remains difficult, depending on the nature of the organic conductive polymer itself and the touch screen production process. For example, a conductive material using an organic conductive polymer as a resistive touch screen has been developed, but since a UV curing process is performed in a preparation process of a resistive touch screen, when the organic conductive polymer such as a polythiophene conductive material is fabricated in a resistive touch screen electrode, It is sensitive to light and has poor conductivity, which results in poor conductivity of the prepared electrode during the UV curing process. In order to overcome the defect that the organic conductive polymer such as polythiophene conductive material is sensitive to light and the conductivity is poor, the developer adds an additive to the organic conductive polymer which can reduce the sensitivity of the organic conductive polymer to light. In order to passivate the light-sensitive property of the organic conductive polymer such as the polythiophene conductive material, the stability of the conductive property is improved, but the effect is not ideal, thereby causing the organic conductive polymer such as the polythiophene conductive material to be popularized in the field of the resistive touch screen. Of course, some researchers have tried to use the organic conductive polymer such as polythiophene conductive material in the field of capacitive touch screens, but the pattern formed by etching in the application is not only poor in electrical conductivity, but more importantly, the color difference of the pattern formed by etching is large. If ΔΕ and ALab are large, they do not meet the production requirements, which seriously affects the visual effect, resulting in product defects or even failure to use. technical problem

Case color difference, capacitive touch screen conductive material with stable conductivity and excellent transmittance.

Another object of embodiments of the present invention is to provide a capacitive touch screen having a small pattern chromatic aberration, stable electrical conductivity, and excellent transmittance.

Another object of the embodiments of the present invention is to provide a capacitor touch screen preparation method capable of effectively reducing pattern chromatic aberration, process cartridge, easy condition control, and low production cost. A further object of embodiments of the present invention is to provide a capacitive touch screen conductive material in an electronic tag and

EL cold light film application. Technical solution

In order to achieve the above object, the technical solution of the present invention is as follows:

A conductive material for a capacitive touch screen comprising the following weight percentage components:

Organic conductive polymer 60~97%

Film-forming resin 0.4~25%

High boiling point polar solvent 2~15%

Surfactant 0.1~1.5%

Among them, the high boiling point polar solvent has a boiling point of 100 to 350 °C.

And a capacitive touch screen comprising a substrate and a conductive function pattern layer laminated on a surface of the substrate, the conductive function pattern layer being formed of the conductive material for the capacitive touch screen.

And a method for preparing a capacitive touch screen, comprising the steps of:

Applying the above conductive material for the capacitive touch screen to any surface of the substrate, and drying to form a conductive layer;

The forming conductive layer is shielded according to a capacitive touch screen function pattern and then etched to form a conductive function pattern;

Or the above conductive material for the capacitive touch screen is printed on any surface of the substrate according to the capacitive touch screen function pattern, and is dried to form a conductive functional pattern.

And, the above-mentioned conductive material for a capacitive touch screen is applied in an electronic tag and an EL luminescent film. Beneficial effect

The conductive material for the capacitive touch screen is based on an organic conductive polymer, and the conductive stability of the conductive material for the capacitive touch screen is effectively improved by the synergistic action of the added film-forming resin and the high-boiling polar solvent. The conductive material for the capacitive touch screen is etched The conductive function pattern has a small color difference or a color difference of almost zero, and has high conductivity stability and transmittance. In addition, the film-forming resin and the high-boiling polar solvent component enhance the sensitivity of the organic conductive polymer to light by synergistic action, so that the conductive material for the capacitive touch screen is sensitive to light of a specific range of wavelengths and is lost. The characteristics of the conductive properties open up a new way of etching to form a conductive functional pattern by using the conductive material for the capacitive touch screen, and the chromatic aberration of etching to form the conductive functional pattern is almost completely eliminated. It is the conductive material used for the capacitive touch screen that has this characteristic, and its application range is wide, and it can be applied in a capacitive touch screen, an electronic tag, and an EL luminescent film.

The above capacitive touch screen, by using the above-mentioned conductive material, has a small or even almost complete pattern chromatic aberration, and has stable electric conductivity and excellent light transmittance.

The preparation method of the above capacitive touch screen only needs to apply the conductive material on the capacitive touch screen to obtain a conductive functional pattern or directly adopt the printing to obtain a conductive functional pattern, and the preparation method thereof has a single process, the condition is easy to control, and the cost is low. Low cost, low equipment requirements, suitable for industrial production. In addition, the conductive function pattern formed according to the method has small color difference, high conductivity stability and transmittance.

The above conductive material for a capacitive touch screen is applied in an electronic label and an EL luminescent sheet. Specifically, the conductive material can be directly printed as an antenna of an electronic label, has stable conductivity, good label stability, high reliability, and high production efficiency. The conductive material can also be used as a transparent conductive electrode in an EL luminescent film, and has stable electrical conductivity and excellent transmittance. Compared with the conventional ITO electrode, the cost is low, the manufacturing process is simple, and the substrate is The choice is broader. DRAWINGS

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

FIG. 1 is a schematic diagram of a process flow of a method for preparing a capacitive touch screen according to an embodiment of the present invention. detailed description In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly, the present invention will be further described in detail below with reference to the embodiments and the accompanying drawings. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Embodiments of the present invention provide a conductive material for a capacitive touch screen that can improve pattern chromatic aberration, have stable electrical conductivity, and excellent transmittance, and include components as follows:

Organic conductive polymer 60~97%

Film-forming resin 0.4~25%

High boiling point polar solvent 2~15%

Surfactant 0.1~1.5%.

Specifically, the above-mentioned organic conductive polymer is a conductive material obtained by removing one electron from a conjugated π orbital of an intrinsically conductive polymer by a doping process. The organic conductive polymer is preferably polyaniline, polythiophene or polypyrrole, and may be used singly or in combination of two or more, and may form a water-based dispersion product or a ready-to-use formulation which is mixed with a solvent and an additive. In a preferred embodiment, the organic conducting polymer is polythiophene ^ρ selected points, for example, Bayer's "Baytron P", CLEVIOS P HC V4, CLEVIOS PH500.

The content of the above organic conductive polymer is preferably 60 to 97%, more preferably 60 to 90%, based on the total mass of the above conductive material. When the content of the organic conductive polymer is less than 60% by weight, the conductive material is liable to be uneven, and apparent color spots and the like are observed when used; when the content is more than 90% by weight, the conductive material cannot obtain a desired high transparency, such as higher than 95. % transmittance.

The film-forming resin component can effectively improve the weather resistance and conductivity of the conductive material used for the capacitive touch screen; the high-boiling polar solvent can effectively reduce the electrical resistivity of the conductive material used for the capacitive touch screen and improve the electrical conductivity. More importantly, the synergistic effect between the film-forming resin component and the high-boiling polar solvent component acts together to act on the organic conductive polymer component, so that the conductive material for the capacitive touch screen is etched to form a conductive The functional pattern has small color difference, high electrical conductivity and transmittance. In addition, the film-forming resin and the high-boiling polar solvent component synergistically enhance the sensitivity of the organic conductive polymer to light, thereby making the conductive material for the capacitive touch screen specific to The characteristic that the wavelength of the wavelength is light-sensitive and loses the conductivity property opens up a new way of etching the conductive functional pattern by using the conductive material for the capacitive touch screen, and the chromatic aberration of etching forming the conductive functional pattern is almost completely eliminated.

Among them, the film-forming resin is preferably an alkali-soluble crosslinkable acrylic resin represented by the following formula (I):

In the formula (I), one of -H and -CH ₃ is represented, and R ₂ represents one of -COOH, -COOCH ₃ , -COOC ₆ H ₅ , -C ₆ H ₅ , and n is 50 to 3000. , preferably from 500 to 1000 integers. Further preferred are water-soluble acrylic resins such as Soluryl-90, Soluryl-120, PP HF401, PP HF402 and the like.

The content of the film-forming resin is preferably 0.4% to 25%, more preferably 0.9% to 20%, based on the total mass of the conductive material. When the film-forming resin content is less than 0.4% by weight, the conductive film formed of the conductive material is inferior in weather resistance; when the content is more than 25 wt%, the conductivity of the conductive film is remarkably lowered.

The above high-boiling polar solvent can lower the electrical resistivity of the material, thereby increasing the electrical conductivity of the organic conductive polymer, and preferably a high-boiling polar organic solvent having a polarity greater than or equal to 4.0 to 6.0. The high boiling polar solvent has a boiling point of from 100 to 350 ° C, preferably from 120 to 250 ° C. Thus, in a preferred embodiment, the high boiling polar solvent is selected, for example, from dimercaptophthalamide (DMF), ethylene glycol (EG), dimercaptosulfoxide (DMSO) or N-decylpyrrolidone (NMP). , can be used alone or in combination.

The content of the above-mentioned high-boiling polar solvent is preferably from 2 to 15%, more preferably from 6 to 11%, based on the total mass of the above-mentioned conductive material. When the content of the high-boiling polar solvent is less than 2% by weight, high conductivity cannot be achieved; when the content is more than 15% by weight, although high conductivity can be achieved, a large amount of high-boiling solvent is added, and the coating needs to be dried at a very high temperature, which will destroy Conductivity of conductive polymers.

The above surfactant can improve the leveling property and wettability of the conductive material when applied, and there is no particular limitation on which surfactant to use, such as a fluorosurfactant, an anionic surfactant, One or a mixture of a nonionic surfactant or the like is used. Among them, fluorosurfactant is preferred

F[CF(CF ₃ )CF ₂ 0]iCF(CF ₃ )S0 ₂ NH(CH ₂ ) ₄ OH , C ₄ F ₉ S0 ₂ NH(CH ₂ ) ₅ OH , F[CF(CF ₃ )CF ₂ 0 At least one of ₅ CF(CF ₃ )S0 ₂ NH(CH ₂ ) ₃ OH, C ₈ F ₁₇ CONH(CH ₂ ) ₂ OH; an anionic surfactant preferably C ₁₂ H ₂₅ Na0 ₄ S, C ₁₈ H One or two complexes of ₂₉ Na0 ₃ S.

The content of the above surfactant is preferably from 0.1 to 1.5%, more preferably from 0.3 to 1.2%, based on the total mass of the above-mentioned conductive material. When the content of the surfactant is less than 0.1% by weight, the leveling property and the wettability at the time of coating are insufficient; when the content is more than 1.5% by weight, bubbles are easily generated during coating, which affects the appearance of the film.

The above conductive material is preferably prepared according to the following preparation method:

(1) weighing each component according to the above formula of the conductive material;

(2) The high-boiling polar solvent, film-forming resin and surfactant mentioned in the step (1) are sequentially added to the organic conductive polymer at intervals of 1 to 5 minutes under stirring conditions. The resulting mixture was then stirred for 10 to 30 minutes to obtain the above conductive material.

Among them, the stirring rate of the step (2) can be, but not limited to, only 200 rpm. The order in which the high-boiling polar solvent, the film-forming resin, and the surfactant in the step (2) are added to the organic conductive polymer is preferably a high-boiling polar solvent, a film-forming resin, and a surfactant are sequentially added in order, wherein The interval is 1 to 5 minutes, and the stirring rate is maintained during the addition of the high boiling polar solvent, the film forming resin and the surfactant component.

Of course, the above conductive material can also be obtained by directly mixing and mixing the components according to the formula. It can be seen from the above that the conductive material used in the capacitive touch screen of the above embodiment utilizes the inherent defects of photo-sensitive and poor conductivity stability of the organic conductive polymer used in the touch screen, by adding additives such as a film-forming resin and a high-boiling polar solvent, and The synergistic effect of the additive magnifies the photo-sensitization property of the organic conductive polymer, and the feature becomes an advantage, opening up a new way to form a conductive functional pattern by etching the conductive material for the capacitive touch screen, and The chromatic aberration that causes the etching to form the conductive functional pattern is almost completely eliminated; and at the same time, by the synergistic action of the additive, the capacitive touch is made The conductive material of the screen has a small color difference or a chromatic aberration of almost zero when the conductive functional pattern is etched, and the conductive stability and transmittance are high.

Correspondingly, an embodiment of the present invention further provides a capacitive touch screen including a substrate and a conductive function pattern layer laminated on a surface of the substrate, the conductive function pattern layer being formed by the conductive material for the capacitive touch screen described above. .

Specifically, the substrate may be a substrate commonly used in the field of touch screens, such as glass or PET films. The conductive functional pattern layer is prepared by using the above conductive material in accordance with a process for preparing a conductive functional pattern. The thickness of the conductive function pattern layer is preferably 0.1 to 1 μm.

The capacitive touch panel provided by the embodiment of the present invention has a stable color conductivity and excellent transmittance by using the above-mentioned conductive material, and the pattern chromatic aberration is small or almost completely eliminated.

Correspondingly, the embodiment of the invention further provides a method for preparing the above capacitive touch screen, which may be an etching method or a printing method. The process flow of the etching method is as shown in FIG. 1 and includes the following steps:

S01. forming a conductive layer on the surface of the substrate: coating the conductive material for the capacitive touch screen described above on any surface of the substrate, and forming a conductive layer after drying;

S02. Shielding and etching the conductive layer: Shielding the formed conductive layer according to the functional pattern of the capacitive touch screen, and etching to form a conductive functional pattern.

Specifically, the substrate in the above step S01 may be a glass or PET film. Conductive materials can be filtered and used directly. In order to obtain a high-quality conductive function pattern, it is preferred to filter the conductive material before coating, for example, by filtering cloth made of nylon or polyester. The coating method can be carried out by a conventional method such as brushing, spraying, spin coating or roll coating. The drying treatment of the coating can be carried out by a conventional method such as heating on a hot air or hot plate at 80 ° C to 180 ° C for 5 min to 1 min. The amount of coating is preferably such that the thickness of the conductive layer formed after drying is 0.1 to 1 μm.

The shielding treatment in the above step S02 may be a masking paste such as: PTF PASTE stripma sk 503fx protective glue or RZJ-390PG manufactured by Suzhou Ruihong, or may be shielded by chrome plate or film. Etching can be done in a variety of ways, such as laser etching, liquid acid-base etching, etching paste Engraved or photoetched. Laser etching or photo-etching is preferably employed, wherein photo-etching can achieve better results, especially the resulting pattern chromatic aberration change ΔΕ and the ALab value is small, even zero.

In a preferred embodiment, the etching in the above step S02 is performed by photolithography having a wavelength of from 100 nm to 1500 nm, preferably from 100 nm to 700 nm. Since the conductive material for the capacitive touch screen in the above embodiment is added with a film-forming resin, a high-boiling polar solvent or the like, and the synergistic action of the additive magnifies the photo-sensitization of the organic conductive polymer to lose conductivity. A characteristic, therefore, the shielded processed conductive material layer for the capacitive touch screen is subjected to light etching of the wavelength using the characteristic. Thus, the unshielded portion of the conductive material layer loses its conductivity after being irradiated with the light, thereby forming a conductive functional pattern. Since the photolithography does not destroy the conductive layer, there is almost no chromatic aberration in the pattern formed as compared with the manner in which the conductive layer is required to be peeled off by laser etching, liquid acid-base etching, etching paste etching or the like. In addition, the illumination etching effectively avoids the cumbersome process of forming a functional pattern by applying glue, exposure, peeling etching, etc., so that the process cartridge for forming a functional pattern by using the conductive material of the capacitive touch screen in the above embodiment has high efficiency. .

In addition, since the conductive pattern for the capacitive touch screen according to the above embodiment is used in combination with the above-described light etching method to form the functional pattern, only the steps of coating, shielding treatment, and photolithography are required, and it is possible to apply any coating and coating according to actual needs. A functional pattern is formed on the substrate to prepare a touch screen. Based on this, the above-described embodiment can be utilized for the conductive material of the capacitive touch screen in combination with the above-described light etching method to prepare a soft touch screen.

When the above capacitive touch screen is prepared by a printing method, the printing method is to print the conductive material for the capacitive touch screen on any surface of the substrate according to the capacitive touch screen function pattern, and form a conductive function pattern after drying. Among them, the printing method can be embossing, silk screen printing, offset printing, letterpress, coating. The base material and the drying treatment are the same as those described in the step S01, and will not be described again.

The method for preparing a capacitive touch screen provided by the embodiment of the present invention can improve the conductive stability of the capacitive touch screen and maintain excellent transmittance by using the above-mentioned conductive material and the above-mentioned method steps, while reducing the chromatic aberration of the pattern formed by etching. And after coating, drying, etching, or printing and drying, Product, preparation method, single process, easy to control conditions, low cost, low equipment requirements, suitable for industrial production.

In addition, since the above-mentioned conductive material for a capacitive touch screen has the characteristics and advantages as described above, the embodiment of the present invention also provides an application of a conductive material for a capacitive touch screen in an electronic label and an EL cold light sheet.

Specifically, the conductive material can be directly printed on the substrate as an antenna for the electronic tag. Printing methods can be screen printing, offset printing, flexographic printing or gravure printing. The substrate is not particularly limited, and such as paper, wood, plastic, metal, textiles, etc., can be printed on a flat surface or printed on any curved surface. The electronic tag prepared by using the conductive material has stable electrical conductivity, good label stability, high reliability, high production efficiency and low cost.

Specifically, the conductive material may be coated on a substrate to be dried as a transparent conductive electrode in an EL luminescent sheet. Similarly, the substrate, coating and drying treatment can be carried out by conventional means and will not be described herein. The EL luminescent sheet prepared by using the conductive material has stable electrical conductivity and excellent transmittance. Compared with the conventional ITO transparent conductive electrode, the EL luminescent sheet has a low cost, a single manufacturing process, and a wider selection of substrates.

The above-mentioned conductive material for a capacitive touch screen, a preparation method and application thereof, a capacitive touch screen, and a method for fabricating the same are exemplified by a plurality of embodiments.

Example 1

A conductive material for a capacitive touch screen and a preparation method thereof, wherein a formulation of a conductive material for a capacitive touch screen is as shown in Table 1 below, and the preparation method is as follows:

First, add 95.6 parts (total mass of conductive material is 100 parts, the same below.) CLEVIOS P HC V4, vigorously stir, then add 2 parts of DMF, 0.9 parts of film-forming resin Soluryl-120 and 1.5 parts of C ₁₉ H in sequence at 2 min intervals ₂₅ Na0 ₃ S, finally, the above mixture solution was further stirred for 20 min to make it uniform, and the conductive material I was obtained.

Capacitive touch screen and preparation method thereof:

S11: The above conductive material I is filtered with a nylon cloth, and then applied to a transparent base PVC sheet by screen printing, and the coating thickness is 20 μm; S12: The substrate coated with the conductive material I in step S11 is dried at a warm air of 120 ° C for 5 min, and the thickness of the conductive layer I formed after drying is 0.3 μm;

S13: using PTF PASTE stripma sk 503fx protective glue according to the required capacitive touch screen function pattern Shielding step S12 conductive layer I need to be protected;

S14: The conductive layer after the shielding treatment in the step S13 is subjected to acid-base etching at a constant temperature (40 ° C), using 1.0% NAOH solution as an etching solution, and etching treatment for 10 minutes to form a conductive functional pattern layer I;

S15: Removing the shielding material to obtain the capacitive touch screen I.

Example 2

First, 90.3 parts of polyaniline (commercially available) was added, vigorously stirred, and then 8.4 parts of NMP, 0.8 parts of HF401 water-soluble acrylic acid, and 0.5 part of C ₁₈ H ₂₉ Na0 ₃ S were sequentially added at intervals of 3 minutes, and finally the mixture solution was further stirred for 20 minutes. , making it uniform, and producing the conductive material II.

Capacitive touch screen and preparation method thereof:

S21: the above conductive material II is filtered with a nylon cloth, and then coated onto the transparent substrate PET by offset printing, and the coating thickness is 30 μm;

S22: The substrate coated with the conductive material II in step S21 is dried in a hot air drying oven at 120 ° C for 3 min, and the thickness of the conductive layer II formed after drying is 0.2 μm;

S24: performing laser etching (speed 900 mm) on the conductive layer after the shielding process in the step S23 to form a conductive function pattern layer II, and obtaining the capacitive touch screen II.

Example 3

First, 90.5 parts of polypyrrole solution (manufacturer: Sigma-Aldrich) was added, vigorously stirred, and then 8.1 parts of NMP, 0.9 parts of HF402 film-forming resin solution were sequentially added at intervals of 5 minutes. 0.5 parts of DISPERBYK-102, and finally the above mixture solution was further stirred for 30 minutes to make it uniform, and the conductive material III was obtained.

Capacitive touch screen and preparation method thereof:

S31: the above conductive material III is filtered with a nylon cloth, and then coated on a transparent base PVC sheet, the coating thickness is 30 μm;

S32: The substrate coated with the conductive material III in step S31 is dried in a hot air drying oven at 80 ° C for 5 min, and the thickness of the conductive layer III formed after drying is 0.2 μm;

S33: The conductive layer after the shielding process is subjected to laser etching (speed 900 mm, power 85%) to form a conductive functional pattern layer III.

S35: Removing the shielding material to obtain the capacitive touch screen III.

Example 4

First, 60 parts of polyaniline (commercially available) was added, vigorously stirred, and then 13.5 parts of NMP, 25 parts of Soluryl-90 resin, and 1.5 parts of DISPERBYK-109 were sequentially added at intervals of 5 minutes, and finally the mixture solution was further stirred for 30 minutes to be changed. Uniformly, the conductive material IV is produced.

Capacitive touch screen and preparation method thereof:

S41: The above conductive material IV is filtered with a nylon cloth, and then coated on the transparent substrate PET by coating, and the coating thickness is 80 μm;

S42: The substrate coated with the conductive material IV in step S41 is dried in a hot air drying oven at 140 ° C for 3 min, and the thickness of the conductive layer II formed after drying is 0.4 μηι;

S43: using PTF PASTE stripma sk 503fx protective adhesive according to the required capacitive touch screen function pattern Shielding step S42 conductive layer IV to be protected;

S44: performing acid-base etching on the conductive layer after the shielding process in the step S43 at a constant temperature (40 ° C), 1.0% NAOH solution as an etching solution, etching treatment for 3 minutes, and then immersing in a 1.5% sulfuric acid solution for 2 minutes. A conductive functional pattern layer IV is formed. S45: removing the shielding material to obtain the capacitive touch screen IV.

Example 5

First, 88.6 parts of CLEVIOS P H500 was added, vigorously stirred, and then 10 parts of EG, 0.4 parts of HF402 film-forming resin solution and 1 part of C18H29Na03S were sequentially added at intervals of 5 minutes, and finally the mixture solution was further stirred for 15 minutes to make it uniform. The conductive material.

Capacitive touch screen and preparation method thereof:

S51: The above conductive material V is filtered with a nylon cloth, and then coated onto the PET transparent substrate by a relief to a thickness of 15 μm;

S52: The substrate coated with the conductive material V in the step S51 is dried in a hot air drying oven at 140 ° C for 3 min, and the thickness of the conductive layer V formed after drying is 0.15 μηι.

S53: Use RZJ-390PG to shield the part of the conductive layer V to be protected in step S52 according to the required capacitive touch screen function pattern.

S54: Photolithography (UV lamp 1000 watts) of the conductive layer after the shielding process in the step S53 is performed, and etching is performed for 2 minutes to form a conductive function pattern layer V.

S55: Removing the shielding material to obtain the capacitive touch screen V.

Example 6

First, add 96.1 parts of CLEVIOS P HC V4, stir vigorously, then add 2 parts of DMSO, 0.9 parts of PVA17-88 and 1 part of DISPERBYK-109 in sequence at 3 min intervals, and finally stir the above mixture for 30 min to make it homogenized. Conductive material VI.

Capacitive touch screen and preparation method thereof:

S61 : The procedure is the same as the step S11 except that the conductive material VI is used.

S62: The same as the step S12, the conductive layer VI after the drying treatment is obtained. S63: Same as step S13.

S64: The same as the step S14, using an acid-base etching to form a conductive functional pattern layer VI.

S65: Same as step 15, to obtain a capacitive touch screen VI.

Example 7

First, 94.7 parts of CLEVIOS P HC V4 was added, vigorously stirred, and then 4.2 parts of EG, 0.6 parts of DHM-301 and 0.8 parts of DISPERBYK-102 were sequentially added at intervals of 5 minutes, and finally the above mixture was stirred for 10 minutes to make it uniform. Conductive material VII.

Capacitive touch screen and preparation method thereof:

S71: The same as the step S11 except that the conductive material VII is used.

S72: The same as the step S12, the conductive layer VII after drying treatment was obtained.

S73: Same as the S13 step.

S74: The conductive functional pattern layer VII is formed by laser etching in the same manner as the step S14.

S75: Same as step 15, to obtain a capacitive touch screen VII.

Example 8

A conductive material for a capacitive touch screen and a preparation method thereof, wherein a conductive material for a capacitive touch screen is formulated as follows, and the preparation method is as follows:

First, 94.8 parts of CLEVIOS P was added, vigorously stirred, and then 4.2 parts of EG, 0.6 parts of DHM-301 and 0.4 parts of C ₁₉ H ₂₅ Na0 ₃ S were sequentially added at intervals of 3 minutes, and finally the mixture was stirred for 20 minutes to make it uniform. A conductive material VIII is obtained.

Capacitive touch screen and preparation method thereof:

S81: The same as the step S11 except that the conductive material VIII is used.

S82: The same as the step S12, the conductive layer VIII after the drying treatment is obtained.

S83: Same as step S13.

S84: The conductive functional pattern layer VIII is formed by laser etching in the same manner as the step S24. S85: Same as step 15, a capacitive touch screen VIII is obtained.

Example 9

An electronic label or EL luminescent sheet and a preparation method thereof. Among them, the electronic label or EL cold light sheet is prepared as follows:

(1) The conductive material I was prepared according to the formulation of Example 1;

(2) The conductive material I in the step (1) is filtered with a nylon cloth, and then applied to the transparent substrate PET film by screen printing to a thickness of 80 μm;

(3) The substrate coated with the conductive material I in the step (2) is dried in a warm air at 120 ° C for 5 min, and the thickness of the conductive layer I formed after drying is 0.9 μηι, to obtain the electronic label or EL cold light sheet. Conductive material.

Example 10

(1) Add 71.4 parts (total mass of conductive material is 100 parts, the same below.) CLEVIOSPHC V4, vigorously stir, then add 2.7 parts of EG, 25 parts of film-forming resin Soluryl-90 and 0.9 parts of DISPERBYK-109 in 5 minute intervals. Finally, the above mixture solution was further stirred for 30 minutes to make it uniform, and the conductive material was obtained.

(2) The conductive material in step (1) is filtered with nylon cloth, coated on the transparent substrate PET by coating, and coated with a thickness of 90 μm;

(3) The substrate coated with the conductive material in the step (2) is dried in a hot air drying oven at 140 ° C for 3 min, and the thickness of the conductive layer II formed after drying is 0.8 μm to obtain the electronic label or EL cold light. The conductive material of the sheet.

Comparative Example 1

For example, a method for preparing a transparent conductive material and a preparation method thereof, wherein the conductive material is prepared as follows:

First, add 96.26 parts of CLEVIOS P HC V4, stir vigorously, then at 5 min intervals Then, 2.58 parts of NMP, 0.86 parts of NeoRez® R986, and 0.3 parts of DynolTM 604 were sequentially added, and finally the above mixture was further stirred for 30 minutes to make it uniform, and conductive material A was obtained.

Capacitive touch screen and preparation method thereof:

SA1 : The procedure is the same as the step S11 except that the conductive material A is used.

SA2: The same as the step S12, the conductive layer A after drying was obtained.

SA3: Same as the S13 step.

SA4: The same as the step S14, laser etching is used to form the conductive function pattern layer A.

SA5: Same as step 15, to obtain a capacitive touch screen eight.

Comparative Example 2

A conductive material for a touch screen and a preparation method thereof, wherein a formulation of a conductive material for a touch screen is as shown in Table 1 below, and the preparation method is as follows:

First, add 52.6 parts of CLEVIOS P HC V4, stir vigorously, then add 3.1 parts of NMP, 31.4 parts of NeoRez® R986 and 10.5 parts of Sancure® 825, 0.1 parts of DynolTM 604 and 0.3 parts of Dimethylaminoethanol (50% aqueous solution) at intervals of 5 min. Finally, the above mixture was further stirred for 30 minutes to make it uniform, and a conductive material B was obtained.

Touch screen and preparation method thereof:

SB1 : The procedure is the same as the S11 step except that the conductive material B is used.

SB2: The same as the step S12, the conductive layer B after drying is obtained.

SB3: Same as step S13.

SB4: The same as the step S14, photolithography is used to form the conductive function pattern layer B.

SB5: Same as step 15, to obtain a capacitive touch screen

Comparative Example 3

First, add 80.49 parts of CLEVIOS P HC V4, stir vigorously, then add 3.48 parts of EG, 15.63 parts of Bayderm Finish 85UD, 0.1 parts of DynolTM 604 and then at 5 min intervals. 0.3 parts of Dimethylaminoethanol (50% aqueous solution), and finally the mixture was stirred for 30 min to make it uniform, and a conductive material C was obtained.

Touch screen and preparation method thereof:

SC1 : The procedure is the same as the S11 step except that the conductive material C is used.

SC2: The same as the step S12, the conductive layer C after the drying treatment was obtained.

SC3: Same as the S13 step.

SC4: The same as the step S14, an acid-base etching is performed to form a conductive functional pattern layer C.

SC5: Same as step 15, to obtain a capacitive touch screen. Performance Testing:

The conductive layers prepared in the above Examples 1 to 8 and Comparative Examples 1 to 3 and the capacitive touch screen were subjected to relevant performance tests. The test method is as follows:

(1) Square resistance and film uniformity: The sheet resistance of the conductive layer before etching was measured by an RTS-8 type four-probe resistance tester, and the uniformity of the film was evaluated by comparing the rate of change of the sheet resistance at a plurality of points. The evaluation criteria are as follows:

1 is less than 8%: good

2 8% - 15%: General

3 is greater than 15%: poor

(2) Transmittance: The transmittance of the coated substrate is expressed in terms of the transmittance of the transparent substrate as 100%. The WGT-S transmittance tester is used according to the GB2410-80 standard (Shanghai Precision Instruments). Science Ltd.) Tested at a wavelength of 550 nm.

(3) Etching effect: The etching effect was evaluated by testing the rate of change of the sheet resistance of the conductive functional pattern layer after etching, and the evaluation criteria were as follows:

1 is greater than 10 ^1G : good

2 10 ⁴ - 10 ⁹ : General 3 is less than 10 ⁴ : poor

(4) Color difference effect: The color difference effect is evaluated by testing the color difference of the conductive function pattern layer after etching and the color difference before etching, and the evaluation criteria are as follows:

1 is less than 0.3: good

2 0.3-0.4: General

3 is greater than 0.5: poor

(5) Conductive stabilizing effect: After placing the prepared conductive material at 60 ° C, placed in a 90% constant temperature and humidity chamber for 240 hours, the test resistance value is taken out, and the placed resistance value R2 and the resistance value R1 before standing. For comparison (R2/R1), the evaluation criteria are as follows:

1 is less than 1.3: good

2 1.3-0.4: General

3 is greater than 1.5: poor

Through the above tests, the results of each test are shown in Table 2 below.

Content (g) Organic conductive polymer Film-forming resin High boiling point polar soluble Surfactant

Example 1 P 1 (95.6) Soluryl-120 (0.9) DMF (2) Fl (1.5) Example 2 P2 (90.3) HF401 (0.8) NMP (8.4) F2 (0.5) Example 3 P3 (90.5) HF402 ( 0.9) NMP(8.1) F3 (0.5) Example 4 P4(60) Soluryl-90 (25) NMP(13.5) F4 (1.5) Example 5 P5(88.6) HF402 (0.4) EG(10) F2 (1) Example 6 CLEVIOS P HC V4 PVA17-88 (0.9) DMSO (2) F4 ( 1 )

(96.1)

EXAMPLES Ί CLEVIOS P HC V4 DHM-301 (0.3) EG (4.2) F3 (0.8)

(94.7)

Example 8 CLEVIOS P (94.8) DHM-301 (0.6) EG (4.2) Fl (0.4) Comparative Example 1 CLEVIOS P HC V4 NeoRez® R986 NMP (2.58) Dyn olTM 604

(96.26) (0.86 ) (0.3) Comparative example 2 CLEVIOS P HC V4 NeoRez® R986 NMP(3.1) Dyn olTM 604

(52.6) (31.4) Sancure® (0.1)

825 ( 10.5 )

Table 2

It can be seen from the above Table 2 that the conductive materials provided in Examples 1 to 5 have good electrical conductivity and transmittance, and at the same time, a good etching effect can be achieved and the color difference changes before and after etching are small, especially when laser etching and photo etching are used. The change is smaller. Among them, the conductive materials in Examples 6 and 7 cannot achieve an etching effect in the acid-base etching, and the conductive material provided in Embodiment 8 can only achieve a general etching effect in laser etching. However, the conductive materials provided in Comparative Examples 1 to 3 could not achieve the good effects of the examples exemplified in the present invention, and the conductive materials provided in Comparative Example 1 could only be achieved in laser etching. The etching effect, the conductive material in Comparative Example 2 could not achieve the etching effect in the photolithography, and the conductive material in Comparative Example 3 could not achieve the etching effect in the acid-base etching, and the color difference before and after the etching in Comparative Examples 1 to 3 The changes are relatively large and the pattern effect is poor.

The electronic label and EL luminescent sheet prepared by Examples 9-10 have stable electrical conductivity and excellent transmittance. Among them, compared with the traditional ITO transparent conductive electrode, the EL luminescent film has a wider manufacturing process and a wider selection of substrates. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

Claims

Claim

1. A conductive material for a capacitive touch screen comprising the following components by weight: Organic conductive polymer 60~97%

Film-forming resin 0.4~25 %

High boiling point polar solvent 2~15%

Surfactant 0.1~1.5%;

2. The conductive material for a capacitive touch screen according to claim 1, characterized by: comprising the following components by weight:

Organic conductive polymer 68~90 %

Film-forming resin 0.9~20%

High boiling point polar solvent 6~11 %

Surfactant 0.3~1.2%.

The conductive material for a capacitive touch screen according to claim 1 or 2, wherein the organic conductive polymer is at least one of polyaniline, polythiophene, and polypyrrole.

The conductive material for a capacitive touch screen according to claim 1 or 2, wherein the film-forming resin is an alkali-soluble crosslinkable acrylic resin of the following formula (I):

H ( I )

In the formula (I), Ri is one of -H and -CH ₃ , and R ₂ is one of -COOH, -COOCH ₃ , -COOC ₆ 3⁄4, -C ₆ H ₅ , and n is 50 - 3000 Integer.

The conductive material for a capacitive touch screen according to claim 1 or 2, wherein the high boiling polar solvent has a polarity of 4.0 to 6.0.

6. The conductive material for a capacitive touch screen according to claim 5, wherein: the high boiling polar solvent is dinonyl amide, ethylene glycol, dimercapto sulfoxide and N-decyl pyrrolidone At least one of them.

The conductive material for a capacitive touch screen according to claim 1 or 2, wherein the surfactant is at least one of a fluorosurfactant, an anionic surfactant, and a nonionic surfactant.

The conductive material for a capacitive touch screen according to claim 7, wherein: the fluorosurfactant is FECF CF CFsOLCF CF^SOsNH CH^OH , C ₄ F ₉ S0 ₂ NH(CH ₂ ) ₅ At least one of OH, F[CF(CF ₃ )CF ₂ 0] ₅ CF(CF ₃ )S0 ₂ NH(CH ₂ ) ₃ OH , C ₈ F ₁₇ CONH(CH ₂ ) ₂ OH.

The conductive material for a capacitive touch screen according to claim 7, wherein the anionic surfactant is at least one of C ₁₂ H ₂₅ Na0 ₄ S and C ₁₈ H ₂₉ Na0 ₃ S.

10. A capacitive touch screen comprising a substrate and a conductive functional pattern layer laminated on a surface of the substrate, the conductive functional pattern layer being a conductive material for a capacitive touch screen according to claims 1-9 form.

The method of manufacturing a capacitive touch screen according to claim 10, comprising the steps of: coating the conductive material for a capacitive touch screen according to any one of claims 1 to 9 on any surface of the substrate, and forming after drying; Conductive layer

Or the conductive material for a capacitive touch screen according to any one of claims 1 to 9 is printed on any surface of the substrate according to a capacitive touch screen function pattern, and is dried to form a conductive functional pattern.

The method of manufacturing a capacitive touch panel according to claim 11, wherein in the step of performing the etching, the etching is laser etching, liquid acid-base etching, etching paste etching or photo etching.

The method of manufacturing a capacitive touch panel according to claim 12, wherein the etching is laser etching or photo etching with a wavelength of from 1 00 nm to 1500 nm.

14. The conductive material for a capacitive touch rhinoceros according to any one of claims 1 to 9 for use in an electronic tag and an EL luminescent film.