KR101876862B1 - Preparing method for optical coating film and optical coating film thereof - Google Patents

Abstract

One embodiment of the present invention is a process for the production of fluoroalkyl silanols by hydrolysis of fluoroalkylalkoxysilanes to produce fluoroalkylsilanols; Mixing the fluoroalkylsilanol and the polysilazane solution to prepare a polysilazane mixed solution; Applying the polysilazane mixed solution on the surface of the substrate to form a coating film; And modifying the polysilazane to silica to cure the coating film, wherein the fluoroalkyl functional group is located on top of the coating film. To provide an optical coating film according to the present invention.

Description

TECHNICAL FIELD The present invention relates to a process for producing an optical coating film and an optical coating film produced thereby.

The present invention relates to a process for producing an optical coating film and an optical coating film produced thereby, and more particularly, to an optical coating film comprising an optical coating film And an optical coating film produced thereby.

Recently, various researches on optical materials have been proceeding due to the development of electronic devices such as flat panel displays, touch panels, optical lenses and displays. Particularly, studies on polysilazane as a material for coating optical materials It is being tried in various ways. Polysilazane is a compound widely used as an optical coating agent. However, in order to cure the polysilazane, it is generally necessary to apply heat at a high temperature to convert nitrogen (Nitrogen) contained in the silazane to oxygen, ₂ ) compound so that the usable substrate has a problem that it is limited as compared with a metal or ceramic substrate having excellent heat resistance.

In addition, in the case of an optical substrate, a user often directly contacts the surface of the optical substrate, so that the substrate is generally water repellent and has chemical resistance and / or weatherability and can be used for a long time as an optical substrate. A general silica compound has a strong hydrophilic nature and contamination due to external chemicals or use can not be used for a long time and can be easily broken.

In order to solve such a problem, Japanese Patent Application Laid-Open No. 2004-210566 (hereinafter referred to as Reference 1) discloses a method of surface-treating a fluorine-containing silane compound. However, The silica itself is used as it is. In order to coat the substrate, a separate treatment is required. Since the solution process using silazane or the like is not disclosed at all, a separate coating treatment process such as an optical display There is a problem that it is difficult to use.

Japanese Patent Laid-Open No. 2004-210566

Disclosure of Invention Technical Problem [8] The present invention provides a method for producing an optical coating film and an optical coating film produced thereby, which comprises mixing a fluoroalkylalkoxysilane, which is a fluorine-based compound capable of increasing water repellency, with a polysilazane solution To provide a method for producing an optical coating film having increased water repellency.

Further, in the curing process of the coating film of the present invention, pulsed UV is irradiated so as not to damage the substrate so that the surface of a plastic substrate other than metal or ceramic substrate or a substrate susceptible to thermal damage can be modified at a low temperature, And to provide an optical coating film produced by the method.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. There will be.

In order to accomplish the above object, the present invention provides a process for producing a fluorosilane, comprising the steps of: hydrolyzing a fluoroalkylalkoxysilane to produce a fluoroalkylsilanol; mixing the fluoroalkylsilanol and the polysilazane solution to prepare a polysilazane mixed solution; Coating the polysilazane mixed solution on a surface to form a coating film; and modifying the polysilazane to silica to cure the coating film, wherein the fluoroalkyl functional group is positioned on the top of the coating film And a method for producing the coating film for optical properties.

In one embodiment of the present invention, the fluoroalkylalkoxysilane may be represented by the following general formula (1).

[Chemical Formula 1]

  (n is an integer of 1 or more, and OR is a methoxy group or an ethoxy group)

In another embodiment of the present invention, the step of preparing the fluoroalkylsilanol may be performed by mixing the fluoroalkylalkoxysilane, the organic solvent and water, followed by stirring.

In one embodiment of the present invention, the organic solvent is selected from the group consisting of dibutylether, toluene, tetrahydrofuran, N-methylpyrrolidone, Xylene, PGMEA, acetate, and cyclohexane.

In one embodiment of the present invention, the polysilazane may be Perhydropolysilazanes or a polysilazane containing a substituent.

In one embodiment of the present invention, the polysilazane may be 1 wt% to 20 wt% based on the total weight of the polysilazane mixed solution.

In one embodiment of the present invention, the method may further include a step of pre-treating the coating film after curing the coating film after the coating film is formed.

In one embodiment of the present invention, the pretreatment step may be a heat treatment under a temperature condition of 90 ° C to 120 ° C.

In order to achieve the above object, the step of curing the coating film may be performed by pulse UV irradiation.

In one embodiment of the present invention, the pulse UV may be applied in a pulse width range of 50 μs to 10,000 μs at a voltage of 1000 V to 5000 V.

In one embodiment of the present invention, the wavelength of the pulse UV may be 200 nm to 1000 nm.

In one embodiment of the present invention, the pulse UV may be applied 1000 to 5000 times.

In another embodiment of the present invention, the coating film may be further cured and then heat-treated.

In order to accomplish the above object, the present invention provides an optical coating film prepared according to the above-described method.

In order to accomplish the above object, the present invention provides an optical substrate having an optical coating film formed on the surface thereof.

According to one embodiment of the present invention, a fluorine alkylalkoxysilane having water repellency is used to further increase the water repellency and to produce a coating film having increased chemical resistance.

Further, when curing is carried out using only polysilazane, it is not possible to use it as an optical coating film due to the nature of silica which is modified with silica and has hydrophilic property. On the other hand, fluoroalkylalkoxysilane, which is a fluorine compound having water repellency, Thereby producing an optical coating film having improved water repellency.

According to the embodiment of the present invention, the polysilazane can be sufficiently converted into silica even at room temperature by using pulsed UV in place of the conventional heat treatment at a high temperature in the process of coating polysilazane and then reforming it into silica, A silica-based optical coating film excellent in heat resistance, chemical resistance, light transmittance, moisture permeability characteristics and hardness can be formed in various materials without limitation of the substrate.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is a flowchart of a method for producing an optical coating film.
FIG. 2 is a schematic diagram (n, x, and y are all integers of 1 or more) of a method for producing an optical coating film.
3 is an FT-IR graph according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" (connected, connected, coupled) with another part, it is not only the case where it is "directly connected" "Is included. Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Hereinafter, a method for producing an optical coating film according to the present invention will be described with reference to the accompanying drawings.

Fig. 1 is a flowchart of a method for producing an optical coating film, and Fig. 2 is a schematic diagram of a method for producing a coating film for optical use.

According to the present invention, there is provided a method for producing a polysilazane mixed solution, comprising the steps of: (S110) hydrolyzing a fluoroalkylalkoxysilane to prepare a fluoroalkylsilanol; (S120) preparing a polysilazane mixed solution by mixing the fluoroalkylsilanol and the polysilazane solution; (S120) coating the polysilazane mixed solution on the surface of the substrate to form a coating film (S120), and modifying the polysilazane to silica to cure the coating film (S120), wherein the fluorine An optical functional coating film characterized in that an alkyl functional group is located on the top of the coating film.

First, in the step (S110) of hydrolyzing a fluoroalkylalkoxysilane to produce a fluoroalkylsilanol,

The fluoroalkylalkoxysilane may be represented by the following general formula (1).

[Chemical Formula 1]

  (n is an integer of 1 or more, and OR is methoxy group or ethoxy group).

Since the fluoroalkyl functional group is water repellent by fluorine (F, fluoro), when the fluoro alkyl functional group is located on the surface of the substrate, even if a hydrophilic silica compound is used, the water repellency can be maintained to a certain level.

At this time, the alkoxy group (-OR) must be converted into a hydroxyl group (-OH) by hydrolysis of the fluoroalkylalkoxysilane. Referring to FIG. 2, referring to FIG. 2, the fluoroalkylalkoxysilane (A ') corresponding to (A) corresponds to the fluoroalkylalkoxysilane and has a hydroxy group by hydrolysis. . ≪ / RTI >

In more detail, the step of preparing the fluoroalkylsilanol may be performed by mixing the fluoroalkylalkoxysilane, the organic solvent, and water, followed by stirring.

The organic solvent may be one selected from the group consisting of DBE (dibutylether), toluene, tetrahydrofuran (THF), n-methyl pyrolidone (NMP), xylene, propylene glycol methyl ether acetate (PGMEA), propylene glycol monomethyl ether acetate Or more.

In particular, referring to FIG. 2, it can be confirmed that the hydrolysis reaction was performed using DBE. However, referring to FIG. 2, it can be confirmed that water (H ₂ O) is mixed together. In the case of the water, it may be preferable to use a very small amount. When the water is added to a certain level or more, the fluoroalkylsilanols formed by the hydrolysis reaction may be aggregated and the reaction may not be performed so as to correspond to the polysilazane according to the following reaction.

At this time, the fluoroalkylsilanol may be prepared at room temperature and may be stirred for about 5 to 20 hours. Although it is not necessary to be limited to the above-mentioned time range, it is possible to prevent aggregation of the fluoroalkylsilanols, but to sufficiently form silanols when they are slowly stirred under normal temperature conditions.

Further, in the case of the fluoroalkylsilanols, since they are in the form of liquid, they can be easily mixed with a polysilazane solution in the following step, and can be easily mixed with one solution, The transparency can be maintained as an optical film while maintaining a constant transparency even after the polysilazane modification step has been performed.

Next, referring to FIG. 2, in the step (S120) of preparing the polysilazane mixed solution by mixing the fluoroalkylsilanol and the polysilazane solution, the mixed solution of the fluoroalkylsilanol-polysilazane The complex form can be expressed as (C).

The polysilazane solution may be prepared by mixing a polysilazane and an organic solvent.

The above-mentioned polysilazane may be collectively referred to as a copolymer compound having a silazane as a host, represented by H ₃ Si [NHSiH ₂ ] nNHSIH ₃ (n is an integer of 1 or more).

The polysilazane may be Perhydropolysilazanes.

The perhydropolysilazane (hereinafter referred to as PHPS) according to the present invention is a polymer comprising Si-N bond as a repeating unit and consisting of Si, N, and H alone. The PHPS does not substantially contain carbon or oxygen except for Si-N bonds. The simplest structure of the PHPS may be a straight-chain structure having a structure represented by the following formula (2) as a repeating unit. Referring to FIG. 2, it can be seen that it is the same as the structure corresponding to FIG. 2 (B).

(2)

In the present invention, PHPS (PHPS represented by Chemical Formula 3) having a chain structure and a cyclic structure in the molecule can be used, and PHPS having a repeating unit represented by Chemical Formula 3 below can be used.

(3)

(n is an integer of 1 or more).

The polysilazane is not limited to PHPS but polysilazane having an alkyl group, a fluoroalkyl group, or a photoreactive group as a substituent can be used.

In the present invention, the polysilazane may have a weight average molecular weight within a certain range. Particularly a polysilazane having a weight average molecular weight in the range of 1,000 to 30,000. When the weight average molecular weight is less than 1,000, the density of the coating film modified by the step of irradiating the following pulse UV may be low to lower the hardness, and the moisture permeability to the contaminants may be increased. When the weight average molecular weight exceeds 30,000 It is difficult to uniformly coat the coating solution on a desired substrate due to an increase in the viscosity of the coating solution. In addition, since the unevenness of the coating film after curing may increase, the manufacturing defect rate may increase. It is preferable to use silazane.

In the present invention, the polysilazane solution may be prepared by mixing the polysilazane and an organic solvent.

The organic solvent used in preparing the polysilazane solution is the same as the solvent used to produce the fluoroalkylsilanol. Therefore, it is preferable to use at least one solvent selected from the group consisting of DBE (dibutylether), toluene, tetrahydrofuran (THF), n-methyl pyrolidone (NMP), xylene, propylene glycol methyl ether acetate (PGMEA), propylene glycol monomethyl ether acetate Lt; / RTI > However, not limited to the solvents listed above, any solvent may be used as the solvent capable of dissolving the polysilazane as the organic solvent.

In the present invention, the polysilazane may be 1 wt% to 20 wt% based on the total weight of the polysilazane mixed solution. The fluorine content of the optical coating film formed according to the control of the weight of the polysilazane and the fluoroalkylsilanol can be controlled and the heat resistance according to the fluorine content can be controlled. In the case of polysilazane, referring to FIG. 2, on the basis of the final stage (D), which is a modified state, since it acts as a binder, it must contain a certain level of weight or more, . However, the present invention is not limited to the above-mentioned range, and the weight ratio thereof can be adjusted according to the properties of the optical coating film and the intended use.

In the step of forming the coating film by applying the polysilazane mixed solution on the surface of the substrate (S130)

It is not limited to such a method. Alternatively, the substrate may be impregnated with the mixed solution, or the mixed solution may be applied to the surface of the substrate by a spin, slot die, microgravure, , Gravure, a method of spraying using a spray, or the like can be used to form a coating film on the surface of a substrate.

At this time, the polysilazane mixed solution may be coated at a rotation speed of 500 rpm to 1500 rpm for 1 second to 1 minute. The coating conditions are such that the state of the polysilazane mixed solution corresponding to (C) in FIG. 2 is uniformly present and that the coating is uniformly performed, and the number of revolutions and the time are set within a general range , The polysilazane mixed solution may be coated with the conditions different from the number of revolutions and time within the above range.

For example, the substrate may be at least one of plastic, metal, and ceramic materials. In the case of the present invention, since the polysilazane can be easily cured by irradiating the pulsed UV mentioned below without heat treatment at high temperature, only a ceramic material or the like which can maintain a constant shape even at a high temperature, It is possible to form a coating film on a substrate such as a plastic which can easily change its shape at a high temperature.

For example, the plastic substrate may be at least one selected from PET, PI, PMMA, PP, PE, PEN, EVOH, PVA, TAC, PC,

As another example, it may be at least one material selected from among clay, glass fiber, composite containing silica, glass, and silicon wafer.

As another example, the metal material may be at least one material selected from aluminum, stainless steel (SUS), and iron.

At this time, it is possible to further include washing the substrate before coating the surface of the substrate with the mixed solution. The step of washing the substrate further includes the step of removing impurities existing on the surface of the substrate before coating the substrate to prevent side reactions from occurring and to minimize the defects of the coating film. In order to clean the substrate, the substrate was immersed in an alkaline cleaner solution at a temperature of 30 ° C to 50 ° C for 10 minutes to 1 hour and taken out, and then DI (Deionized water) / IPA (IsoPropyl Alcohol) The ultrasonic treatment can be carried out while immersed in the mixed solution for 1 minute to 10 minutes. Such a method is merely one method for cleaning the substrate, and other methods for cleaning the substrate may be used in addition to the above method.

In the step (S140) of modifying the polysilazane with silica to cure the coating film,

Various methods can be used for curing, such as treating ammonia water or irradiating with pulse UV.

The method may further include pretreating the coating film before curing the coating film after the coating film is formed.

The pretreatment may be performed by heat treatment at a temperature of 90 ° C to 120 ° C. The pretreatment by the heat treatment in the temperature range described above is for coating only the material corresponding to (C) in FIG. 2, which is a composite polysilazane-fluoroalkylsilanol complex, on the substrate and for removing residual solvent.

However, when the surface of the substrate is pretreated at a temperature of less than 90 ° C., impurities such as residual solvent may not be removed and impurities may be present in the coating film A defective ratio may occur. If it exceeds 120 캜, the coated plastic material such as PET may be damaged, and it is preferable to perform the pretreatment within the above temperature range.

For example, the step of curing the coating film may be by pulse UV irradiation.

Pulsed UV irradiation is a method of momentarily irradiating energy with millions of minutes of pulse width in seconds or tens of millions of minutes in the same way as ordinary UV irradiation. The pulse UV irradiation system can perform the modification (curing) process even at room temperature by irradiating energy instantaneously at a relatively low temperature condition, unlike a general thermosetting method in which a high temperature condition of 1000 占 폚 or more is required to be maintained. It is possible to shorten the process time and be an efficient process as compared with the thermal curing method which causes damage to a wide area as the heat is transferred. In the case of the thermosetting method, a separate cooling device or a separate heating device should be provided for each process. On the other hand, in the case of using the pulse UV, the pulse UV lamp can easily operate the power source, (Curing) process. Therefore, even if the entire process is compared, the process may be more economical than the thermal curing process because the process is safer and the maintenance cost is lower.

Further, as the polysilazane is modified with silica, the modified silica acts as a binder, so that the silica functional group of the fluoroalkylsilane is bonded to the silica as the binder, so that the fluoroalkyl functional moiety having water repellency is modified Depending on the nature of the fluoroalkyl functionality being located on the opposite side of the polysilazane, the fluoroalkyl functionality may be located on top of the coating film.

Therefore, although the silica is a hydrophilic substance, the water-repellent fluoroalkyl functional group is located on the surface of the coating film, so that the water repellency can be increased.

 For example, in the present invention, the pulse UV can be irradiated in a pulse width range of 50 μs to 10,000 μs under a voltage condition of 1000 V to 5000 V.

Further, the wavelength of the pulse UV at this time may be 200 nm to 1000 nm. More preferably, the wavelength of the pulsed UV may be between 200 nm and 450 nm. Depending on the length of the wavelength, 200 nm to 450 nm may be the wavelength range most favorable for modifying by irradiation with pulse UV as the ultraviolet region band.

More specifically, the wavelength of the pulse UV may be 200 nm to 400 nm. In the case of the pulse UV, it can be modified within the above-mentioned temperature range in order to modify (cure). If it exceeds 400 nm, the energy of the pulse UV is relatively small and may be merely sterilized light. It may be desirable to use the pulse UV within the wavelength.

When the pulse UV is irradiated, if the voltage is increased, the irradiation time is shortened and the number of times of irradiation can be reduced. However, when the voltage exceeds 5000 V, the pulse UV can be irradiated in the range of 1000 V to 5000 V, which is economically undesirable in terms of cost and operating time in terms of process operation.

When irradiating pulse UV, it is possible to irradiate pulsed UV under a mixed gas containing oxygen, especially in air and gas atmosphere and at a relative humidity of 10% or more.

The number of times of application of the pulse UV may be from 1,000 times to 5,000 times.

The number of application of the pulse UV may vary depending on a voltage condition to be applied, so that the number of application of the pulse UV may be reduced as the voltage applied is not limited.

As another embodiment of the present invention, it is possible to provide an optical coating film produced according to the process for producing an optical coating film.

According to another embodiment of the present invention, there is provided an optical substrate having an optical coating film formed on the surface thereof according to the process for producing the optical coating film.

[ Example  One] Manufacture of optical coating film

1. PET film (substrate) preparation step

A PET film having a thickness of 200 μm was immersed in an alkaline cleaner at a temperature of 40 ° C. for 30 minutes and then immersed in a solution of DI (deionized water) / IPA (isopropyl alcohol) in a ratio of 1: 1 and sonicated for 5 minutes The surface of the PET film is cleaned.

After cleaning the surface of the PET film, the convection oven is set at 100 DEG C and dried for one hour.

2. Fluoroalkyl Silanol  Manufacturing stage

(PFTES-OH) was synthesized by adding 0.09 g of 1H, 1H, 1H, 2H, 2H-Perfluorooctyltriethoxysilane (PFTES), 1.3 g of DBE (dibutylether) and H ₂ O in a small amount and stirring at room temperature for 17 hours.

3. Polysilazane  Preparation of mixed solution (coating solution)

A synthetic polysilazane solution was prepared by mixing 5% Perhydropolysilazane (PHPS) and DBE, and slowly added dropwise to the PFTES-OH solution. After stirring for 1 hour, polysilazane mixed solution was synthesized.

4. Polysilazane  Mixed solution coating step

The prepared mixed solution is coated on the PET substrate surface.

5. Pretreatment of coating film  step

The coated PET substrate is heat-treated at 120 DEG C for 1 minute.

6. Manufacturing steps of optical coating film

The coated PET substrate was irradiated with 2000 times of pulse UV at a voltage of 3000 V under a pulse width of 100 μs to prepare an optical coating film.

[ Example  2] Manufacture of optical coating film

An optical coating film was prepared in the same manner as in Example 1 except that 1.0 wt% of 1H, 1H, 2H, 2H-Perfluorooctyltriethoxysilane (PFTES) was used and 5 wt% of PHPS was used.

[ Example  3] Manufacture of optical coating film

An optical coating film was prepared in the same manner as in Example 1 except that 0.2 wt% of 1H, 1H, 2H, 2H-Perfluorooctyltriethoxysilane (PFTES) was used and 5 wt% of PHPS was used.

[ Example  4] Manufacture of optical coating film

An optical coating film was prepared in the same manner as in Example 1 except that 0.2 wt% of 1H, 1H, 2H, 2H-Perfluorooctyltriethoxysilane (PFTES) was used and 3 wt% of PHPS was used.

[ Comparative Example  One]

Only PET substrate is prepared.

[ Comparative Example  2]

In the same manner as in Example 1 except that 1H, 1H, 2H, and 2H-Perfluorooctyltriethoxysilane (PFTES) were not mixed, polysilazane alone was used to prepare an optical coating film.

The results of contact angle (º) observations for Examples 1 to 3 and Comparative Example 2 are shown in Table 1 below.

division Polysilazane ratio The fluoroalkylsilane ratio Contact angle Example 1 5 wt% 5 wt% 118 º Example 2 5 wt% 1.0 wt% 112º Example 3 5 wt% 0.2 wt% 108 º Example 4 3wt% 0.2 wt% - Comparative Example 1 0wt% 0wt% - Comparative Example 2 10wt% 0wt% 27 º

In the case of using only polysilazane as in Comparative Example 1, it can be confirmed that the contact angle is remarkably reduced by the silica formed as the polysilazane is modified. This is due to the hydrophilicity of silica itself, which can be seen as a problem caused by curing polysilazane.

However, referring to Examples 1 to 3, when the fluoroalkylsilane is contained, even if the polysilazane is modified due to the fact that the fluoroalkyl functional group having water repellency is positioned on the surface of the substrate, It can be confirmed that an optical film having improved water repellency is produced.

FIG. 3 is a FT-IR graph according to an embodiment of the present invention. In the preparation of Example 1, a silazane functional group (-Si-NS) represented by 5PH- (-Si-O-) group can be identified as PFTES-OH in DBE, fluoroalkylalkoxysilane itself is described as PFTES, and it can be confirmed that the fluoroalkylalkoxysilane is produced by DBE solvent One polysilazane solution was labeled PHPS in DBE.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

Claims (15)

Hydrolyzing the fluoroalkylalkoxysilane to produce a fluoroalkylsilanol;
Mixing the fluoroalkylsilanol and the polysilazane solution to prepare a polysilazane mixed solution;
Applying the polysilazane mixed solution on the surface of the substrate to form a coating film; And
Modifying the polysilazane to silica to cure the coating film,
In the step of curing the coating film, as the polysilazane is modified into silica, the modified silica acts as a binder, and the silica functional group of the fluoroalkylsilanol becomes bonded with the silica as the binder, Characterized in that the functional group is located on top of the coating film,
Wherein the fluoroalkylalkoxysilane is represented by the following Formula 1: < EMI ID =
[Chemical Formula 1]

(n is an integer of 1 or more, and OR is methoxy group or ethoxy group).
delete The method according to claim 1,
Wherein the fluoroalkylsilanol is prepared by mixing the fluoroalkylalkoxysilane, the organic solvent, and water, followed by stirring.
The method of claim 3,
The organic solvent may be at least one selected from the group consisting of DBE (dibutylether), toluene, tetrahydrofuran (THF), n-methyl pyrolidone (NMP), xylene, propylene glycol methyl ether acetate (PGMEA), propylene glycol monomethyl ether acetate Wherein the solvent is a solvent.
The method according to claim 1,
Wherein the polysilazane is Perhydropolysilazanes or a polysilazane containing a substituent group.
The method according to claim 1,
Wherein the polysilazane is 1 wt% to 20 wt% of the total weight of the polysilazane mixed solution.
The method according to claim 1,
Further comprising the step of pre-treating the coating film before curing the coating film after forming the coating film.
8. The method of claim 7,
Wherein the pre-treatment step is a heat treatment under a temperature condition of 90 ° C to 120 ° C.
The method according to claim 1,
Wherein the step of curing the coating film comprises:
Wherein the film is irradiated with pulsed UV light.
10. The method of claim 9,
Wherein the pulse UV is applied in a pulse width range of 50 占 퐏 to 10,000 占 퐏 at a voltage of 1000V to 5000V.
10. The method of claim 9,
Wherein the wavelength of the pulse UV is 200 nm to 1000 nm.
10. The method of claim 9,
Wherein the number of times of application of the pulse UV is 1000 times to 5000 times.
The method according to claim 1,
Further comprising the step of heat treating the coating film after curing the coating film.
A coating film for optics produced according to claim 1.
An optical substrate according to claim 1, wherein the optical coating film is placed on a surface.

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