KR102207976B1 - Preparing method for anti-finger layer - Google Patents

Abstract

The present invention relates to a method of forming an anti-fingerprint layer, and more particularly, to form an anti-fingerprint film on one surface of a substrate by a wet process, and apply the film for 10 to 20 minutes under conditions of a temperature of 100°C or higher and a relative humidity of 50% or higher. By drying, it is possible to form an anti-fingerprint layer showing an excellent contact angle without expensive equipment such as vacuum evaporation equipment, and a method of forming an anti-fingerprint layer that can significantly improve process yield without requiring a long drying time.

Description

Forming method for anti-finger layer {Preparing method for anti-finger layer}

The present invention relates to a method of forming an anti-fingerprint layer.

The display of electronic products, for example, the screen of a TV, the monitor screen of a PC or laptop, the screen of a mobile device such as a mobile phone or PDA, or a touch panel of an electronic product, can be used with fingerprints or when the user touches his or her face to make a call. Components such as facial fat and protein adhere to the surface, making the dirt more visible and dirty to look at.

As one of the methods to solve this problem, a method of attaching a separate film having an anti-galre function to a display unit such as a mobile phone or a navigation system to make the fingerprint less conspicuous is used. However, in this method, the attached film The image quality deteriorates due to a decrease in transmittance and an increase in haze due to the low surface hardness, resulting in a problem that a flaw occurs. Therefore, measures have been taken to prevent fingerprints from adhering to the display surface by directly forming a coating layer on the display and touch panel without attaching a separate film.

Representatively, there is a method of forming a water-repellent and oil-repellent coating layer. This coating layer has a high contact angle with respect to moisture and oil, so that even if fat adheres to the display, it can be easily removed.

The water-repellent and oil-repellent coating layer is typically formed by a vacuum deposition method or a wet coating method such as immersion, printing, or spraying.

In the case of such a vacuum evaporation method, a coating layer having a good contact angle can be formed, but the equipment used for evaporation is expensive, and due to the characteristics of the equipment, it is not applicable to the glass of the ledger in which each unit cell is formed on the glass of a large area. there is a problem.

On the other hand, in the case of the wet coating method, expensive equipment such as vacuum deposition equipment is not required, and the coating layer can be performed under easier processing conditions. However, it takes a long time to dry after the formation of the coating film, and the coating film showing a good contact angle There is a problem that formation is not easy.

Therefore, there is a need for a method of forming a coating layer that can easily form a coating layer having an excellent contact angle without expensive equipment.

Korean Patent No. 1242591 discloses a method of depositing an anti-fingerprint layer.

Korean Patent Registration No. 1242591

An object of the present invention is to provide a method capable of forming an anti-fingerprint layer exhibiting an excellent contact angle even by a wet method.

An object of the present invention is to provide an anti-fingerprint layer having excellent durability.

1. A method of forming an anti-fingerprint layer, in which an anti-fingerprint film is formed on one surface of a substrate by a wet process, and the film is dried for 10 to 20 minutes under conditions of a temperature of 100°C or higher and a relative humidity of 50% or higher.

2. The method of 1 above, wherein the wet process is to apply a liquid composition for forming an anti-fingerprint layer to one side of the substrate.

3. The method of 1 above, wherein the wet process is an inkjet or spray process.

4. The method of 1 above, wherein the wet process is a spray process.

5. In the above 1, the drying process temperature is 130 to 150 ℃, the method of forming an anti-fingerprint layer.

6. In the above 1, wherein the drying process humidity is 50 to 75%, the method of forming an anti-fingerprint layer.

7. The method of 1 above, wherein the drying process is performed for 10 to 15 minutes.

8. The method of 1 above, wherein the drying is performed for 10 to 15 minutes at a temperature of 130 to 150° C. and a relative humidity of 50 to 75% for 10 to 15 minutes.

9. The method for forming an anti-fingerprint layer according to the above 2, wherein the composition for forming the anti-fingerprint layer comprises perfluoropolyether and a solvent.

10. In the above 9, wherein the perfluoropolyether is at least one selected from the group consisting of perfluoropolytrimethylene oxide, perfluoropolyethylene oxide, perfluoropolydioxolane, and perfluoropolytrioxocan, fingerprint Method of forming the barrier layer.

11. The method of claim 9, wherein the solvent is at least one selected from the group consisting of perfluoro aliphatic hydrocarbons, perfluoro aromatic hydrocarbons, and polyfluorinated aliphatic hydrocarbons.

The method for forming an anti-fingerprint layer of the present invention can form an anti-fingerprint layer exhibiting an excellent contact angle without expensive equipment such as vacuum deposition equipment.

In addition, the anti-fingerprint layer formed by the method of the present invention is excellent in durability and has a low contact angle reduction rate even when abrasion is caused by the surrounding environment or use.

The method for forming an anti-fingerprint layer of the present invention does not require a long drying time for forming an anti-fingerprint layer, even by a wet method. Accordingly, the process yield can be significantly improved.

The present invention forms an anti-fingerprint coating film on one side of a substrate by a wet process, and by drying the coating film for 10 to 20 minutes at a temperature of 100°C or higher and a relative humidity of 50% or higher, it is excellent without expensive equipment such as vacuum deposition equipment. The present invention relates to a method of forming an anti-fingerprint layer, which can form an anti-fingerprint layer having a contact angle, and can significantly improve a process yield without requiring a long drying time.

Hereinafter, the present invention will be described in detail.

In the method of forming an anti-fingerprint layer of the present invention, an anti-fingerprint film is formed on one surface of a substrate by a wet process, and the film is dried for 10 to 20 minutes under conditions of a temperature of 100°C or higher and a relative humidity of 50% or higher.

The substrate is not particularly limited as long as it is a material that has high durability and allows a user to see the display well, and a material used in the art may be used without particular limitation. For example, glass, polyethersulfone, polyacrylate, polyether imide, polyethylene naphthalate, polyethylene terephthalate, polyphenylene sulfide, polyarylate, polyimide, polycarbonate, cellulose triacetate, cellulose acetate propio Nate or the like may be used, and preferably glass may be used.

The substrate may be subjected to a pretreatment process such as primer treatment, plasma treatment, corona treatment, etc. to improve hydrophilicity so that the anti-fingerprint coating film can be easily formed.

In the present specification, the wet process refers to all processes of forming a coating film by applying a liquid anti-fingerprint layer-forming composition to a substrate, and examples thereof include processes such as inkjet printing and spraying.

Among the above methods, spray is a method of spraying a composition for forming an anti-fingerprint layer through a spray nozzle, and even when the surface of the substrate is irregular or irregular, the coating film can be uniformly formed, and a small amount of the composition can be used, which will be described later. Process time can be shortened. Further, it is preferable in that it can be easily performed without expensive equipment, and a coating film can be easily formed not only for a single substrate but also for a large-area substrate in which a plurality of unit cells are formed. In addition, there is a concern that stains may occur on the surface of the substrate during inkjet printing, but such stains can also be prevented by spraying.

The thickness of the coating film is not particularly limited, and may be formed to have a thickness of 10 to 20 nm after drying, for example. When the thickness of the coating film is within the above range, it is easy to remove fingerprints and oil formed on the anti-fingerprint layer. If the thickness is out of the range, durability against abrasion is weakened, and the anti-fingerprint layer may be damaged with continuous use.

The composition of the composition for forming an anti-fingerprint layer is not particularly limited, and a composition for forming an anti-fingerprint layer having a composition commonly used in the art may be used, and may include, for example, a fluorine-based polymer, a solvent, and the like.

As a fluorine-based polymer, perfluorine polyether is mentioned, for example.

The perfluorinated polyether is not particularly limited and known in the art may be used, for example, perfluoropoly(methylene oxide), perfluoropoly(ethyleneoxide), and perfluorinated Sopolydioxolane (Perfluoropoly(dioxolane)), perfluoropoly(trioxocane), etc. are mentioned, Preferably it may be perfluoropolytrimethylene oxide. These can be used alone or in combination of two or more.

Perfluorinated polyether compounds can be synthesized according to known methods [JAMES T. HILL, J. Macromol. Sci.Chem. , A8, (3), p499 (1974)].

The solvent is not particularly limited as long as it is capable of dissolving the fluorine-based polymer while easily forming a coating film and drying to form an anti-fingerprint layer. For example, perfluorohexane, perfluoromethylcyclohexane and perfluoro Perfluoro aliphatic hydrocarbons having an alkyl group having 5 to 20 carbon atoms or a cycloalkyl group such as -1,3-dimethylcyclohexane; Perfluoro aromatic hydrocarbons having an aryl group having 6 to 18 carbon atoms such as bis(trifluoromethyl)benzene; Polyfluorinated aliphatic hydrocarbons having an alkyl group having 1 to 20 carbon atoms, such as perfluorobutyl methyl ether and ethyl nonafluoro isobutyl ether, and preferably ethyl nonafluoroisobutyl ether. These can be used alone or in combination of two or more.

Next, the anti-fingerprint layer is formed by drying the coating film.

In the method of forming an anti-fingerprint layer of the present invention, an anti-fingerprint layer is formed by forming an anti-fingerprint coating film by a wet process, and drying the coating film for a predetermined time under a certain range of temperature and humidity conditions. By selecting and controlling temperature, humidity, and time within a predetermined range, an anti-fingerprint layer exhibiting an excellent contact angle can be formed even by a wet process.

The drying process is carried out at a temperature of 100°C or higher. If the drying process temperature is less than 100°C, drying of the solvent is insufficient, and thus it is impossible to form an anti-fingerprint layer having excellent durability. In terms of sufficiently drying the solvent within a short time and obtaining a cured coating film to form an anti-fingerprint layer having excellent durability, it may be preferably 130 to 150°C. If the temperature is further increased at 150° C., the advantage of increasing the temperature is negligible.

In addition, the drying process is carried out under conditions of 50% or more relative humidity. If the humidity is less than 50%, curing of the coating film is not sufficiently performed, and the coating film may be damaged during the post process. It may be preferably 50 to 75%. If the humidity is further increased from 75%, the benefit of increasing humidity is negligible.

The drying process is performed for 10 to 20 minutes within the above temperature and humidity conditions. If the drying process time is less than 10 minutes, the solvent is less dried and curing is not sufficiently performed, so that the anti-fingerprint layer having excellent durability cannot be formed. In addition, various patterns, such as bezel patterns, may be formed on the substrate on which the anti-fingerprint layer is formed. If the drying time exceeds 20 minutes, such patterns may be damaged. It may be preferably carried out for 10 to 15 minutes in terms of sufficiently drying the solvent and obtaining a cured coating film to form an anti-fingerprint layer having excellent durability, and preventing damage to an existing pattern.

In terms of improving the yield of the anti-fingerprint layer forming process and forming a pattern showing a better contact angle and durability, the drying is more preferably performed at a temperature of 130 to 150° C. and a relative humidity of 50 to 75% for 10 to 15 minutes. Can be done.

The anti-fingerprint layer manufactured by the above method may have a water contact angle of 110 to 125°. That is, it does not spread widely on the surface of the anti-fingerprint layer and maintains the shape of the droplet. This indicates remarkably excellent water repellency, and can be easily wiped off even when fingerprints and oils adhere to the surface of the anti-fingerprint layer.

In addition, a conventional anti-fingerprint layer is worn by the surrounding environment and the use of the user, so that the anti-fingerprint effect gradually decreases, but the anti-fingerprint layer manufactured by the method of the present invention has excellent durability and can maintain excellent contact angle characteristics even when worn. have.

Hereinafter, preferred embodiments are presented to aid the understanding of the present invention, but these examples are only illustrative of the present invention and do not limit the scope of the appended claims, and examples within the scope and spirit of the present invention It is obvious to those skilled in the art that various changes and modifications are possible, and it is natural that such modifications and modifications fall within the scope of the appended claims.

Example And Comparative example

Plasma treatment was performed on one side of a tempered glass substrate having a thickness of 0.7t, and a composition for forming an anti-fingerprint layer containing 0.3% perfluorinated polytrimethylene oxide and 99.7% ethyl nonafluoro isobutyl ether was applied through a spray nozzle. It was applied to the plasma-treated surface to form an anti-fingerprint coating film having a thickness of 10 nm. Thereafter, an anti-fingerprint layer was formed by drying the coating film according to the temperature, humidity and time conditions shown in Table 1 below.

Experimental example . Before and after abrasion resistance test Water contact angle compare

The contact angle after dropping 3 µl of pure water on the anti-fingerprint layer of Examples and Comparative Examples was measured with a contact angle measuring instrument manufactured by KRUSS, and the anti-fingerprint layer was rubbed 1500 times with an eraser for abrasion resistance test, and then water contact angle was repeated in the same manner as above. By measuring the contact angle reduction rate was evaluated according to the following criteria.

A: Less than 3% of reduction in contact angle after wear

B: After abrasion, the contact angle reduction rate exceeds 3% to 5% or less

C: After abrasion, the contact angle reduction rate exceeds 5% to 9% or less

D: After abrasion, the contact angle reduction rate exceeds 9% to 13%

E: After abrasion, the contact angle reduction rate exceeds 13% to 20% or less

F: More than 20% of reduction in contact angle after wear

division Temperature(℃) Humidity(%) Drying time (minutes) effect Example 1 100 50 10 C Example 2 100 65 10 C Example 3 100 80 10 C Example 4 100 50 20 C Example 5 100 65 20 C Example 6 100 80 20 C Example 7 130 50 10 B Example 8 130 65 10 B Example 9 130 80 10 B Example 10 130 50 20 B Example 11 130 65 20 B Example 12 130 80 20 B Example 13 150 50 10 B Example 14 150 65 10 A Example 15 150 80 10 A Example 16 150 50 15 B Example 17 150 65 15 A Example 18 150 80 15 A Example 19 150 50 20 B Example 20 150 65 20 A Example 21 150 80 20 A Example 22 155 50 15 B Example 23 155 65 15 A Example 24 155 80 15 A Example 25 155 50 20 B Example 26 155 65 20 A Example 27 155 80 20 A Comparative Example 1 50 50 10 F Comparative Example 2 50 50 25 F Comparative Example 3 100 50 5 F Comparative Example 4 100 65 5 E Comparative Example 5 100 80 5 E Comparative Example 6 130 50 5 E Comparative Example 7 130 65 5 E Comparative Example 8 130 80 5 E

Referring to Table 1, the anti-fingerprint layer formed according to the method of Examples 1 to 27 exhibited a water contact angle within the range of 115 to 118°, and exhibited an excellent water contact angle similar to that of the anti-fingerprint layer formed by the conventional dry process. . In addition, it was confirmed that the contact angle reduction rate was small even after abrasion and thus had excellent durability.

However, it was confirmed that the anti-fingerprint layer formed according to the method of Comparative Examples 1 to 8 had a water contact angle of only 110 to 115 °, and the contact angle reduction rate after abrasion was also large and durability was poor.

Claims (11)

Applying a liquid composition for forming an anti-fingerprint layer to one surface of a substrate by a wet process to form an anti-fingerprint coating film; And
Including; to form a fingerprint protection layer by curing the coating film by performing a drying process on the coating film under conditions of a temperature of 130 to 155°C and a relative humidity of 50% or more with a running time of 10 to 20 minutes, and,
The composition for forming the anti-fingerprint layer comprises perfluorinated polyether and a solvent,
The perfluorinated polyether is at least one selected from the group consisting of perfluorinated polytrimethylene oxide, perfluorinated polyethylene oxide, perfluorinated polydioxolane, and perfluorinated polytrioxocane, a method of forming an anti-fingerprint layer.
delete The method of claim 1, wherein the wet process is a bar coating, die coating, spin coating, dipping, printing or spraying process.
The method of claim 1, wherein the wet process is an air spray process.
The method of claim 1, wherein the drying process is performed at a temperature of 130 to 150°C.
The method of claim 1, wherein the drying process has a relative humidity of 50 to 75%.
The method of claim 1, wherein the drying process is performed for 10 to 15 minutes.
The method of claim 1, wherein the drying is performed for 10 to 15 minutes at a temperature of 130 to 150°C and a relative humidity of 50 to 75%.
delete delete The method of claim 1, wherein the solvent is at least one selected from the group consisting of perfluoro aliphatic hydrocarbons, perfluoro aromatic hydrocarbons, and polyfluorinated aliphatic hydrocarbons.