KR20130097137A - Plastic and coating mathod - Google Patents

Abstract

PURPOSE: A film in which an anti-fouling coating layer is formed and a coating method are provided to dramatically improve the anti-fouling performance since thermosetting coating solution is applicable for plastic materials by forming the anti-fouling coating layer with the thermosetting coating solution after forming a buffer layer, which acts as a mediator between the base material of plastic and the thermosetting coating solution, on the base material of plastic. CONSTITUTION: A film in which an anti-fouling coating layer is formed comprises: the base material of plastic (10); a buffer layer (30), in which preprocessing is performed with plasma treatment in order to increase adhesion by improving the surface quality of the base material of plastic and forming illuminance, formed with oxide film or nitride film; and the anti-fouling coating layer (40) formed on the buffer layer with thermosetting coating solution. A coating method of the film in which an anti-fouling coating layer is formed is as follows. The buffer layer is formed with the oxide film or the nitride film after the preprocessing is performed with plasma treatment in order to increase adhesion by improving the surface quality of the base material of plastic and forming illuminance. The thermosetting coating solution is coated on the buffer layer. The buffer layer promotes the reaction of the thermoplastic coating solution, and the anti-fouling coating layer is formed on the base material of plastic.

Description

Film with antifouling coating layer and coating method thereof {Plastic And Coating Mathod}

The present invention relates to a film having an antifouling coating layer and a coating method thereof, and more particularly, after forming a buffer layer on a base material of a plastic material, and then forming an antifouling coating layer with a thermosetting coating liquid, heat which was impossible due to the characteristics of a conventional plastic material. The present invention relates to a film having an antifouling coating layer capable of increasing productivity by lowering manufacturing cost as well as improving antifouling performance through the use of a curable coating solution and a coating method thereof.

In general, the base material used in manufacturing a display panel or window is largely divided into a glass material and a plastic material.

In this case, the panel or window also serves as a finishing material in the device, and since the external impact or foreign matter is a part directly contacting the antifouling coating layer is formed on the panel or window to improve antifouling performance, such as fingerprint resistance, scratch resistance, etc. do.

The method used to form the antifouling coating layer as described above is divided into wet and dry, the wet is divided into a method using a UV curable coating liquid and a method using a thermosetting coating liquid.

In general, in the case of a glass material, an antifouling coating layer is formed of a thermosetting coating liquid, and in the case of a plastic material, an antifouling coating layer is formed of a UV curing coating liquid.

As described above, in the case of a plastic material, an antifouling coating layer may be formed only with a UV-curable coating solution. In general, after forming a hard coating layer on a plastic base material, an antifouling coating layer is formed with a UV-curable coating solution or UV on a hard-coated plastic base material. A method of forming an antifouling coating layer with a curable one-component coating solution is used.

When using the antifouling coating method of the conventional plastic base material as described above, not only is UV curing coating solution expensive, but there is a problem that the overall coating film thickness for antifouling performance is increased and thus the transmittance is lowered. There was a problem of rising.

On the contrary, in the case of the thermosetting coating liquid applied to the glass, the coating liquid is cheaper than the UV curing coating liquid, and since the consumption of the coating liquid is low, the manufacturing cost can be reduced, and the overall coating film thickness is reduced, which has the advantage of high transmittance.

However, in the case of the plastic base material, when the antifouling coating layer is formed by using the thermosetting coating solution, the adhesion to the plastic base material is not very poor, and the reaction is not performed between the heat curable coating solution and the plastic base material. Due to the lack of performance, there was a problem that the antifouling coating layer using the thermosetting coating liquid was virtually impossible in the plastic base material.

In addition, as the functions of various electronic devices are expanded, the demand for plastic panels or windows rather than glass materials is expected to increase in order to slim down and light weight, and to develop a film having an antifouling coating layer which can reduce manufacturing costs while securing antifouling performance. This is very necessary.

In order to solve the above problems, an object of the present invention is to form a coating reaction layer formed of an oxide film or a nitride film on a base material of a plastic material, and then to form an antifouling coating layer with a thermosetting coating liquid, thereby applying a thermosetting coating liquid to a plastic material. It is possible to significantly improve the antifouling performance, and to provide a film and a method for coating the antifouling coating layer having a cost reduction by replacing the use of an expensive UV curing coating solution.

In order to achieve the above object, the film having the antifouling coating layer formed thereon includes a plastic base material, a buffer layer formed on the plastic base material, and an antifouling coating layer formed of a thermosetting coating solution on the buffer layer, and the buffer layer is the heat curable material. The antifouling coating layer is formed on the plastic base material by promoting the reaction with the coating solution.

The buffer layer is formed of an oxide film or a nitride film.

The plastic base material is characterized in that any one or two or more selected from PMMA, PET, PC is mixed and manufactured.

The oxide film may be formed of any one selected from silicon dioxide (SiO 2), silicon oxide (SiO), and titanium oxide (TiO 2).

And the buffer layer is characterized in that formed to a thickness of 100 ~ 5000Å.

In addition, the antifouling coating layer is characterized in that formed by coating with a fluorine-based thermosetting coating liquid.

On the other hand, the coating method of the film having the antifouling coating layer is formed by forming a buffer layer on the plastic base material and applying a thermosetting coating solution on the buffer layer, the buffer layer to promote the reaction of the thermosetting coating solution to form an antifouling coating layer on the plastic base material Characterized in that it comprises a step.

And a pretreatment step including cleaning the surface of the plastic base material with water or a solvent before forming the buffer layer, and performing plasma treatment on the cleaned surface of the plastic base material for surface modification and roughness formation. .

The forming of the buffer layer may include forming an oxide layer using any one material selected from silicon dioxide (SiO 2), silicon monoxide (SiO), and titanium oxide (TiO 2).

And the buffer layer is characterized in that formed to a thickness of 100 ~ 5000 Å.

In addition, the step of forming the antifouling coating layer is characterized in that it comprises the step of coating the fluorine-based thermosetting coating solution on the oxide film and the heat curing to promote the bonding of the solvent volatilization and coating components of the coating solution.

The antifouling coating layer formed film and the coating method according to the present invention as described above forms a buffer layer that serves as a reaction medium between the plastic base material and the thermosetting coating solution on the base material of the plastic material, thereby forming an antifouling coating layer with a thermosetting coating solution, Even thermosetting coating solution can be applied, which greatly improves antifouling performance, and replaces the use of expensive UV curing coating solution, resulting in excellent cost reduction.

1 is a cross-sectional view schematically showing a structure of a film on which an antifouling coating layer is formed according to a preferred embodiment of the present invention.
2 is a flowchart schematically showing a film coating method in which an antifouling coating layer is formed according to a preferred embodiment of the present invention.
3 is a photograph comparing the antifouling property of the film formed with an antifouling coating layer according to the present invention, Figure 4 is a photograph comparing the removal of the antifouling coating layer formed film according to the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

1 is a cross-sectional view schematically showing the structure of a film having an antifouling coating layer according to a preferred embodiment of the present invention.

1, the antifouling coating layer formed film according to the present invention is formed on the plastic base material 10 and the hard coating layer 20 formed on the base material and the buffer layer 30 formed on the hard coating layer and the buffer layer It may be configured to include an antifouling coating layer 40 formed of a heat curable coating liquid.

The film having the antifouling coating layer formed thereon may be used as a display protection means such as a panel or a window, and the window means a structure in which a display unit of a display area and an exterior panel area serving as a case other than the display area are integrally formed of a printed layer. .

One surface of the window may be formed on a portion of the window other than the display area in the form of an icon, a pattern, a hairline, or the like, and a printed layer may be formed to provide a texture or aesthetics of a metal material. Can be printed on one side.

Here, the plastic base material 10 will be defined as a concept including all plastic, acrylic materials such as PMMA, PET, PC, or a mixture thereof.

The hard coating layer 20 may be configured as a separate layer, but may be hard coated on a plastic base material.

The buffer layer 30 plays a role of a buffer between the plastic base material and the antifouling coating layer, and plays a role of enhancing adhesion and antifouling performance through reaction with an antifouling coating layer formed of a thermosetting coating solution.

The buffer layer 30 may be formed of a film of any material capable of reacting with the thermosetting coating solution, and in particular, may be formed of an oxide film or a nitride film, and in the case of an oxide film, silicon dioxide (SiO 2), silicon monoxide (SiO), or titanium oxide ( An oxide film such as TiO2) may be used, and a nitride film such as silicon nitride (SiN) or gallium nitride (GaN) may be used in the case of a nitride film.

However, it is preferable to form silicon dioxide (SiO 2) or silicon nitride (SiN) containing silicon (Si) which is the main component of the glass in order to achieve the effect similar to that of the glass base material.

For example, after forming a buffer layer with silicon dioxide (SiO 2), and forming an antifouling coating layer (AF coating layer) using a thermosetting coating solution on the buffer layer, the hydrogen fluoride coating solution and the silicon dioxide, which are main components of the thermosetting coating solution, An antifouling coating layer is formed on the plastic base material by a similar action to reacting with (SiO 2) to form an antifouling coating layer with the thermosetting coating liquid on the glass base material yarn.

Here, the thickness of the oxide film is preferably formed in the range of 100 ~ 5000 Pa, preferably in the range of 300 ~ 3500 Pa.

The thermosetting coating solution for forming the antifouling coating layer 40 may use a conventional thermosetting fluorine-based coating solution (eg, EGC 1700, EGC 1720, etc.).

Hereinafter, the film coating method in which the antifouling coating layer is formed according to a preferred embodiment of the present invention will be described.

2 is a flowchart schematically showing a film coating method in which an antifouling coating layer is formed according to a preferred embodiment of the present invention.

 Referring to FIG. 2, first, a hard coating layer 20 is formed on a plastic base material 10. Here, although the hard coating layer may be formed separately, a hard base plastic base material may be used. In addition, if necessary, the hard coat layer or the hard coat process may be omitted.

Subsequently, pretreatment is performed to form an effective buffer layer on the plastic base material 10.

The pretreatment may include a process of cleaning the surface of the plastic base material using water or a solvent and a process of plasma treating the cleaned base material surface.

Methanol, distilled water, BOE, etc. may be used as the solvent used in the washing process, and physically removes foreign substances or impurities on the surface of the base material through the washing process.

In addition, the plasma treatment is performed to modify the surface, to form roughness, and to increase adhesion when the oxide film is deposited.

The plasma treatment is to remove contaminants present on the glass surface using atmospheric pressure plasma treatment, and chemical plasma treatment and physical plasma treatment may be used.

Chemical plasma treatment uses oxygen as a discharge gas to remove contaminants on the surface of a sample by reacting with active species present in the plasma. Oxygen atoms, ozone, and excitation particles that are broken in the plasma state react with the sample to form a gaseous state. Phosphorus is removed in the form of moisture and carbon dioxide, and fine surface roughness is formed through the surface modification effect.

In the physical plasma treatment, high energy ions collide with the surface of a sample to remove contaminants from the surface, and thus fine roughness is formed on the surface through a surface modification effect.

According to the removal of contaminants and the formation of fine roughness by the plasma treatment, not only the application of the coating liquid and the formation of the coating layer may be easily performed, but also the wear resistance and the salt spray resistance after coating may be greatly improved.

When the plasma pretreatment for the plastic base material is completed as described above, a buffer layer is formed on the plastic base material.

The buffer layer 30 may be an oxide film such as silicon dioxide (SiO 2), silicon monoxide (SiO), titanium oxide (TiO 2), or a nitride film such as silicon nitride (SiN) or gallium nitride (GaN). It is preferable to use silicon dioxide (SiO 2) or silicon nitride (SiN) containing the main component of the glass to form an antifouling coating layer through a reaction similar to that of glass.

The buffer layer 30 may be a thin film formed on the plastic base material through a conventional deposition method such as sputtering, evaporation, PECVD, MOCVD, CVD, or a conventional coating method such as spin coating or dispenser.

If the thickness of the buffer layer 30 is too thin, binding strength and antifouling performance may be degraded, such as directly forming an antifouling coating layer using a thermosetting coating solution on a plastic base material due to a decrease in the bonding strength with the antifouling coating layer. It can be increased to form a thickness of 100 ~ 5000Å ..

When the buffer layer 30 is formed as described above, the thermosetting coating solution is applied to the upper surface of the plastic base material to form the antifouling coating layer 40. Here, the coating liquid may be used a fluorine-based thermosetting coating liquid, it may further include an additive to improve the fingerprinting and adhesion properties, coating properties.

Herein, the coating may be performed by any wet coating method such as spin, dispensing, spindle, spray, dipping, slit, bar, and the like.

Subsequently, a solvent of the coating liquid is volatilized and a drying process is performed to promote bonding between the coating component and the oxide film on the plastic base material.

Here, the drying process may be a drying method such as IR drying, hot air drying.

Subsequently, the film having the antifouling coating layer coated thereon is inserted into the chamber and subjected to high temperature and high humidity to activate the hydrolysis and dehydration reaction of the coating material to form a strong bonding structure between the coating material and the glass surface.

Here, the high temperature and high humidity treatment is preferably treated for 30 to 60 minutes under 50 to 90 ℃ temperature and 60 to 90% relative humidity conditions.

Hereinafter, the performance evaluation of the antifouling coating layer formed film according to the present invention will be described.

In order to evaluate the performance of the present invention, a sample prepared by depositing 300 Å, 500 Å, 1500 Å, 3500 Å of silicon dioxide (SiO2) as a buffer layer on a PMMA / PC sheet (305 mm x 229 mm X 1.0T) using a plastic base material, respectively, 50 mm X 50 mm After cutting, the thermosetting fluorine-based antifouling coating solution was coated in a spin coater under conditions of 500 rpm_10 sec / 2000 rpm_10 sec / 500 rpm_10 sec, and then a film sample having an antifouling coating layer thermally cured at 85 ° C. for 30 min was prepared.

Evaluation of Fingerprint Characteristics on Oxide Film Deposition Thickness

Table 1 below is a table evaluating the fingerprint characteristics according to the oxide film (SiO 2) deposition thickness.

Referring to <Table 1>, there is no oil-proof pen, water-based pen, fingerprint removal and antifouling property for a plastic base material without an antifouling coating layer, and even if there is an antifouling coating layer, an antifouling coating layer is formed with a thermosetting coating liquid on a plastic base material without a buffer layer. As with the antifouling coating layer, it can be seen that there is no removal and antifouling property. It can be seen that even if the antifouling coating layer is formed as a thermosetting coating layer on the plastic base material, the antifouling performance is very poor.

However, after depositing 300Å of oxide film (SiO2) into the buffer layer and forming the antifouling coating layer with the thermosetting coating solution, the removal resistance and antifouling property were somewhat decreased, but the initial contact angle was greatly increased to 109 degrees. It can be seen that the 83 °, 89.5 degrees significantly increased, and the haze characteristics were also improved.

Therefore, when the oxide film (SiO 2) is 300 kPa, the antifouling performance is less satisfactory than when the antifouling coating layer is formed and when the antifouling coating layer is directly formed on the plastic base material with the thermosetting coating solution, but it can be seen that the improvement starts.

When the oxide layer (SiO2) is 1500Å and 3500Å as the buffer layer, it is not only excellent in removing and antifouling property, but also in the contact angle, transmittance and haze characteristics, the antifouling performance similar to that in the case of forming an antifouling coating layer with a thermosetting coating solution on glass is realized. Could know.

3 is a photograph comparing the antifouling property of the film formed with an antifouling coating layer according to the present invention, Figure 4 is a photograph comparing the conventional removal.

Referring to FIG. 3, both the aqueous and oily pens are buried in the plastic base material without the antifouling coating, and when the antifouling coating layer is formed directly with the thermosetting coating liquid without forming an oxide film on the plastic base material, the antifouling property forms an ink droplet of the aqueous and oily pens. However, it can be seen that the antifouling property is inferior to the plastic base material without the antifouling coating.

In contrast, when the oxide layer (SiO 2) is deposited as the buffer layer, the antifouling property exhibits the performance of forming the aqueous and oil pen ink droplets similarly to the case where the antifouling coating layer is formed of the thermosetting coating solution on the glass.

In addition, referring to FIG. 4, the water-based pen is removed from the plastic base material without the antifouling coating, but the oil-based pen is not removed. When the antifouling coating layer is formed with the thermosetting coating liquid directly without forming an oxide film on the plastic base material, the water-based pen is removed. It can be seen that only the ink droplets are removed and the overall removal property is inferior to the antifouling property similar to the plastic base material without the antifouling coating.

In contrast, when the oxide layer (SiO 2) is deposited as the buffer layer, the water-repellent pen and the oil pen can be easily removed similarly to the case where the antifouling coating layer is formed of the thermosetting coating liquid on the glass.

As a result, according to the present invention, when the oxide film is deposited on the plastic base material as a buffer layer and then the antifouling coating layer is formed with the thermosetting coating solution, the antifouling performance is significantly improved compared with the case where there is no antifouling coating layer and when the antifouling coating layer is formed with the thermosetting coating solution directly on the plastic base material. It can be seen that, when the oxide film is deposited to a thickness of 500 kPa or more, antifouling performance similar to that of forming an antifouling coating layer with a thermosetting coating solution on glass is shown. The effect of the deposition of the oxide film (SiO2) is that the plastic base material does not react with the thermosetting coating liquid due to the properties of the material, so the adhesion is reduced, so that the coating effect does not occur, but the oxide film (SiO2) similar to the glass component is deposited due to the deposition of the oxide film. It is judged that the same coating effect as that of glass occurs due to reaction with the coating liquid.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

10: plastic base material
20: hard coating layer
30: buffer layer
40: antifouling coating layer (AF coating layer)

Claims (12)

With plastic base material;
A buffer layer formed of an oxide film or a nitride film by performing a pretreatment by plasma treatment to modify a surface and to form roughness on the plastic base material to increase adhesion;
An antifouling coating layer formed of a thermosetting coating liquid on the buffer layer;
The antifouling coating layer is formed film, characterized in that the buffer layer promotes the reaction with the thermosetting coating liquid to form an antifouling coating layer on a plastic base material.
The method of claim 1,
The plastic base material is
PMMA, PET, PC selected any one or two or more selected from the film is formed antifouling coating film, characterized in that the mixture.
The method of claim 1,
The buffer layer
A film having an antifouling coating layer formed of an oxide film or a nitride film.
The method of claim 3, wherein
When the buffer layer is formed of an oxide film
A film having an antifouling coating layer formed of any one selected from silicon dioxide (SiO 2), silicon oxide (SiO), and titanium oxide (TiO 2).
The method of claim 3, wherein
When the buffer layer is formed of a nitride film
A film with an antifouling coating layer formed of silicon nitride (SiN) or gallium nitride (GaN).
The method according to claim 4 or 5,
The oxide film or nitride film is a film having an antifouling coating layer, characterized in that formed in a thickness of 100 ~ 5000Å.
The method of claim 1,
The antifouling coating layer
A film having an antifouling coating layer formed by coating with a fluorine-based thermosetting coating solution.
As a film coating method in which an antifouling coating layer is formed,
Performing a pretreatment by plasma treatment to form a surface on the plastic base material and forming roughness to increase adhesion, and forming a buffer layer with an oxide film or a nitride film;
Coating the thermosetting coating solution on the buffer layer, the buffer layer to promote the reaction of the thermosetting coating solution to form an antifouling coating layer on a plastic base material film coating method is formed.
The method of claim 8,
Before the plasma treatment
The antifouling coating layer formed film coating method further comprises the step of cleaning the surface of the plastic base material with water or a solvent.
The method of claim 8,
The forming of the buffer layer may be performed using any one material selected from silicon dioxide (SiO 2), silicon monoxide (SiO), titanium oxide (TiO 2), silicon nitride (SiN), or gallium nitride (GaN). Film coating method that the antifouling coating layer is formed.
The method of claim 10,
The buffer layer
Film coating method with an antifouling coating layer, characterized in that deposited to 100 ~ 5000 mm thick.
The method of claim 8,
Forming the antifouling coating layer
Coating the fluorine-based thermosetting coating solution on the buffer layer;
A method for coating a film with an antifouling coating layer, comprising the step of thermosetting to promote solvent volatilization of the coating solution and bonding of the coating component.

Images