KR101742955B1 - Manufacturing method of barrier film and barrier film - Google Patents

Abstract

Modifying the graphene oxide with inorganic particles; Adding graphene oxide modified with the inorganic particles to a silica sol-gel solution; Coating a silica sol-gel solution to which graphene oxide modified with the inorganic particles is added on a base film to form a first coating layer; And coating a polyvinyl polymer on the first coating layer to form a second coating layer, and a barrier film produced according to the method.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a barrier film,

The present invention relates to a barrier film production method and a barrier film produced by the above production method.

Materials for food, medicine, packaging materials and electronic device encapsulants require oxygen and moisture barrier properties to prevent degradation of the product due to heat or light. Specifically, the food packaging material is required to have an oxygen barrier property in order to minimize microbes and content decay caused by oxygen, and the electronic device encapsulant is required to have a very high level of barrier property because the device itself is very vulnerable to moisture and oxygen .

In order to manufacture a film having a high moisture barrier property, a dry process such as sputtering must be carried out. However, in the case of a dry process, due to a high manufacturing cost and a large defect and low flexibility, Is difficult to apply. In order to solve the drawbacks of the dry process, a sol-gel coating method for implementing a flexible moisture barrier film has been researched and developed. Particularly, many researches have been made to use graphene.

Graphene has a two - dimensional carbon atomic plane structure in which the carbon atomic layer is packed in a hexagonal lattice point plane. Graphene has tensile strength 311 times stronger than steel, electron mobility 1,000 times faster than silicon, thermal conductivity 10 times better than copper, transparent enough to pass 98% of light, And can be widely used for other nano materials, inks, heat dissipation materials, lightweight materials, energy electrode materials, next-generation semiconductors, and transparent electrodes. Also, graphene has a barrier property that blocks even small helium penetration.

Such graphene can be combined with a polymer having excellent oxygen and moisture barrier properties such as polyethylene, polypropylene, and polyvinylidene chloride, and can be utilized in a barrier film. Polymers are insufficient in blocking oxygen and moisture, and studies using nanomaterials such as graphene together with polymers are continuing. (Korean Patent Publication No. 10-2011-0016287)

In the conventional method of producing a graphene barrier film, a dispersion solution of graphene oxide, reduced graphene oxide, or the like is mixed with a polymer solution to be coated, but in this case, due to problems such as degradation of the dispersibility of graphene, There is a problem that moisture barrier property of the barrier film is deteriorated.

Therefore, there is a need for further research and development of a method for producing a barrier film using graphene, which is excellent in moisture barrier property.

One embodiment is to provide a method of manufacturing a barrier film which is excellent in moisture barrier property, is suitable for mass production, and can maintain the flexibility of a film due to a wet process.

Another embodiment is to provide a barrier film produced according to the above production method.

One embodiment includes modifying graphene oxide with inorganic particles; Adding graphene oxide modified with the inorganic particles to a silica sol-gel solution; Coating a silica sol-gel solution to which graphene oxide modified with the inorganic particles is added on a base film to form a first coating layer; And coating a polyvinyl polymer on the first coating layer to form a second coating layer.

The step of modifying the graphene oxide with the inorganic particles may include the steps of adding an inorganic particle precursor to a solvent in which graphene oxide is dispersed and then stirring and washing and drying after stirring.

The inorganic particle precursor may be added in an amount of 50 to 1000 parts by weight based on 100 parts by weight of the graphene oxide.

The inorganic particles may be aluminum or alumina, and the inorganic particle precursor may be aluminum isopropoxide.

The graphene oxide may be dispersed in a solvent in which alcohol and water are mixed in a weight ratio of 3: 1 to 5: 1.

The silica sol-gel solution may be a mixed solution of an alkoxide silane precursor, alcohol, water, and hydrochloric acid.

The alkoxide silane precursor may be tetraethyl orthosilicate or tetraethoxysilane (TEOS).

The silica sol-gel solution may contain 4 to 6 moles of the alcohol, 3 to 5 moles of the water and 0.01 to 0.2 moles of the hydrochloric acid, based on 1 mole of the alkoxide silane precursor.

The graphene oxide modified with the inorganic particles may be added in an amount of 100 to 10,000 parts by weight based on 100 parts by weight of the alkoxide silane precursor.

The step of coating a polyvinyl polymer on the first coating layer to form a second coating layer may include coating an organic solvent having a polyvinyl polymer dissolved therein on the first coating layer to form a second coating layer .

The polyvinyl polymer may be included in an amount of 10 to 20 parts by weight based on 100 parts by weight of the organic solvent.

The organic solvent may be selected from the group consisting of N, N-dimethylacetamide (DMAc), N-methyl-2-pyrrolidone (NMP), tetrahydrofuran ), N, N-dimethylformamide (DMF), or a combination thereof.

The polyvinyl polymer may be polyvinyl alcohol (PVA), polyvinylidene chloride (PVDC), ethylene vinyl alcohol (EVOH), polyacrylonitrile (PAN), poly Chlorotrifluoroethylene (PCTFE), or a combination thereof.

The barrier film production method may further comprise a step of irradiating the formed first coating layer with ultraviolet light having a maximum absorption wavelength at 100 nm to 200 nm at a scanning speed of 300 mJ / s to 500 mJ / s before forming the second coating layer after the formation of the first coating layer And irradiating the cured resin with a curing agent.

The base film may be formed of a material selected from the group consisting of polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PC), polycarbonate (PC), poly (methyl methacrylate) , Polyimide (PI), oriented polypropylene (OPP), biaxially oriented polypropylene (BOPP), polyethylene 2,6-dicarboxylate naphthalate (PEN), polyethylene 2,6-dicarboxylate naphthalate, polyethersulfone (PES), polyester, or polystyrene (PS).

The surface of the base film may be coated with a urethane primer.

Another embodiment provides a barrier film produced according to the above manufacturing method.

Other aspects of the present invention are included in the following detailed description.

According to an embodiment of the present invention, there is provided a barrier film which is excellent in moisture barrier property and is manufactured by a wet process such as a microgravure and a slot die, so that mass production is possible and further flexibility of the film due to the wet process can be maintained. Can be manufactured.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

In the drawings, the thicknesses of layers and regions are exaggerated for clarity. In addition, where a layer is referred to as being "on" (or "on") another layer or substrate, it may be formed directly on another layer or substrate, or a third layer may be interposed therebetween . Like numbers refer to like elements throughout the specification.

"Combination" as used herein, unless otherwise specified, means mixing or copolymerization.

One embodiment is a method of making a barrier film, comprising: modifying graphene oxide with inorganic particles; Adding graphene oxide modified with the inorganic particles to a silica sol-gel solution; Coating a silica sol-gel solution to which graphene oxide modified with the inorganic particles is added on a base film to form a first coating layer; And coating a polyvinyl polymer on the first coating layer to form a second coating layer.

According to one embodiment, a coating solution is prepared by adding graphene oxide modified with the inorganic particles to a silica sol-gel solution, and coating the coating solution on a base film to form a first coating layer, whereby optical properties and moisture barrier properties An excellent barrier film can be produced.

The graphene oxide before being modified with the inorganic particles can be produced by oxidizing graphene by a known method such as a Hummers method or a Brodie method. For example, graphene can be produced by oxidation by the Humulus method.

The step of modifying the graphene oxide with the inorganic particles may include a step of adding an inorganic particle precursor to a solvent in which graphene oxide is dispersed and then stirring and washing and drying after stirring.

The inorganic particle precursor may be added in an amount of 50 parts by weight to 1,000 parts by weight, for example, 50 parts by weight to 500 parts by weight, based on 100 parts by weight of the graphene oxide. When the inorganic particle precursor is contained in the above-described range relative to 100 parts by weight of the graphene oxide, there is an advantageous effect in improving the optical characteristics of the barrier film.

The inorganic particles may be aluminum or alumina, and the inorganic particle precursor may be aluminum isopropoxide. Aluminum or other inorganic particles other than alumina may be used, but aluminum isopropoxide has an advantageous effect in terms of cost compared to other inorganic particles.

The graphene oxide may be dispersed in a solvent mixed with alcohol and water at a weight ratio of 3: 1 to 5: 1.

For example, the step of modifying the graphene oxide with the inorganic particles may include the steps of adding graphene oxide to a solvent mixed with alcohol and water in a weight ratio of 3: 1 to 5: 1, and then dispersing the graphen oxide in an ultrasonic sonicator , Adding the inorganic particle precursor to another solvent in which alcohol and water are mixed in a weight ratio of 3: 1 to 5: 1, stirring at 40 to 80 DEG C for 30 minutes to 2 hours, Mixing the solvent with another solvent to which the inorganic particle precursor has been added and then stirring the mixture at 40 to 80 ° C for 3 to 9 hours to conduct a hydrolysis reaction; And drying at 50 < 0 > C to 100 < 0 > C.

The silica sol-gel solution may be a mixed solution of an alkoxide silane precursor, alcohol, water, and hydrochloric acid. For example, the silica sol-gel solution may comprise 4 to 6 moles of the alcohol, 3 to 5 moles of the water and 0.01 to 0.2 moles of the hydrochloric acid, based on 1 mole of the alkoxide silane precursor. When the silica sol-gel solution contains the silane precursor, the alcohol, the water, and the hydrochloric acid in the above respective ranges, it can be mixed well with the graphene oxide modified with the inorganic particles described above.

The silica sol means a suspension in which silica particles composed of small particles so small as to neglect gravity and gravity are dispersed in a solvent. The silica sol-gel is a suspension of silica particles obtained by hydrolysis and condensation reaction of an alkoxide silane precursor , The silica particles in the silica sol-gel are present in a state of loss of fluidity due to agglomeration and condensation. That is, the silica sol is in a state in which the silica particles in the solution are dispersed with fluidity, and the silica sol-gel is in a state in which the silica particles are coagulated (bound) in the solution to lose fluidity.

According to one embodiment, by using a silica sol-gel rather than a silica sol, a dense silica film chemically bonded to each other is formed in the entirety of the base film to reduce the permeation of oxygen and moisture to improve the barrier property have.

The alkoxide silane precursor may be tetraethylorthosilicate (TEOS), tetramethylorthosilicate (TMOS), or a combination thereof. For example, the alkoxide silane precursor may be tetraethyl orthosilicate (TEOS).

The alcohol may be methanol, ethanol, propanol, butanol, but is not limited thereto.

The graphene oxide modified with the inorganic particles may be added in an amount of 100 parts by weight to 10,000 parts by weight, for example, 1,000 parts by weight to 7,000 parts by weight, based on 100 parts by weight of the alkoxide silane precursor. When the graphene oxide modified with the inorganic particles is contained in an amount of less than 100 parts by weight based on 100 parts by weight of the alkoxide silane precursor, it is difficult to secure the barrier properties with the addition of the inorganic particles. The low dispersibility of the degraded and modified graphene oxide may cause a crack in the sol-gel coating film to act as a foreign substance on the surface of the coating film, thereby deteriorating the barrier property.

For example, the step of adding graphene oxide modified with the inorganic particles to the silica sol-gel solution may be carried out by mixing tetraethylorthosilicate (TEOS), methanol, water and hydrochloric acid in a molar ratio of 1: 5: 4: 0.1 The mixture was stirred at room temperature to obtain a silica sol-gel solution. The graphene oxide modified with the above-mentioned inorganic particles was added to the silica sol-gel solution in an amount of 100 parts by weight based on 100 parts by weight of the tetraethylorthosilicate (TEOS) To 10,000 parts by weight, and stirring for 30 minutes to 2 hours.

For example, in the step of forming a first coating layer by coating a silica sol-gel solution to which graphene oxide modified with the inorganic particles is added on a base film, the thickness of the coating solution coated on the base film is about 10 nm to 1 Mu m, and the coating can be performed as a wet coating by a method such as microgravure, slot die, bar coating, spin coating and the like.

For example, the step of coating a silica sol-gel solution containing graphene oxide modified with the inorganic particles on a base film to form a first coating layer may be carried out by using a silica sol- (For example, bar coating) a gel solution on a base film and drying at a temperature of 70 ° C to 110 ° C for 1 hour to 5 hours to form a first coating layer.

The drying may be performed on a vacuum oven or a hot plate. The drying may be carried out at 60 ° C to 120 ° C for 2 hours to 5 hours, but is not limited thereto.

The step of coating a polyvinyl polymer on the first coating layer to form a second coating layer may include coating an organic solvent having a polyvinyl polymer dissolved therein on the first coating layer to form a second coating layer .

The polyvinyl polymer may be included in an amount of 10 to 20 parts by weight based on 100 parts by weight of the organic solvent. When the content of the polyvinyl polymer is within the above range of the organic solvent, the barrier properties of the barrier film can be secured and the coating property can be prevented from deteriorating while moisture barrier properties can be improved.

The organic solvent may be selected from the group consisting of N, N-dimethylacetamide (DMAc), N-methyl-2-pyrrolidone (NMP), tetrahydrofuran ), N, N-dimethylformamide (DMF), or a combination thereof, but is not limited thereto.

The polyvinyl polymer may be polyvinyl alcohol (PVA), polyvinylidene chloride (PVDC), ethylene vinyl alcohol (EVOH), polyacrylonitrile (PAN), poly Polychlorotrifluoroethylene (PCTFE), or a combination thereof, but is not limited thereto.

For example, the thickness of the coating liquid for forming the second coating layer coated on the first coating layer may be about 1 탆 to 20 탆, and the coating may be a wet coating such as microgravure, slot die, bar coating, spin coating Lt; / RTI >

For example, the step of coating a polyvinyl polymer on the first coating layer to form a second coating layer may be performed by adding a polyvinyl polymer such as polyvinylidene chloride (PVDC) to an organic solvent such as tetrahydrofuran (THF) The polyvinyl polymer is added in an amount of 15 parts by weight based on 100 parts by weight of the organic solvent, and the mixture is stirred to dissolve. After the solution of the polyvinyl polymer is coated on the first coating layer (for example, Coating) and drying at a temperature of 70 ° C to 110 ° C for 1 hour to 5 hours to form a second coating layer.

The drying may be carried out on a vacuum oven, a handkerchief or a hot plate. The drying may be carried out at 60 ° C to 120 ° C for 2 hours to 5 hours, but is not limited thereto.

The method for producing a barrier film according to an embodiment is characterized in that before forming the second coating layer after forming the first coating layer, the formed first coating layer is irradiated with ultraviolet rays having a maximum absorption wavelength at 100 nm to 200 nm at 300 mJ / / s < / RTI > at a scan speed and then curing.

For example, the ultraviolet ray may have a maximum absorption wavelength in the range of 150 nm to 200 nm, for example, 150 nm to 180 nm, and the ultraviolet ray may be irradiated using an excimer lamp to perform a curing process.

When the ultraviolet ray having the maximum absorption wavelength in the above range is cured by irradiation at the scanning speed of the above range, it is possible to obtain a barrier film having a low water permeability by securing the optical characteristics and improving the adhesion with the polymer coating liquid due to the surface treatment have.

The base film may be formed of a material selected from the group consisting of polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PC), polycarbonate (PC), poly (methyl methacrylate) , Polyimide (PI), oriented polypropylene (OPP), biaxially oriented polypropylene (BOPP), polyethylene 2,6-dicarboxylate naphthalate (PEN), polyethylene 2,6-dicarboxylate naphthalate, polyethersulfone (PES), polyester, or polystyrene (PS), but the present invention is not limited thereto.

The base film may be one whose surface is coated with a urethane primer. When the coating liquid is coated on the base film coated with the urethane primer, the first coating layer coated on the base film may not be easily peeled off because the adhesion is improved. Further, in order to improve the adhesion, the film may further be subjected to surface treatment such as plasma or corona.

The base film may have a thickness of 125 占 퐉 or less, for example, 30 占 퐉 or more and 125 占 퐉 or less. When the thickness of the film satisfies the above range, the oxygen and moisture barrier properties are excellent, and solution casting is easy, so that the solution can be uniformly applied over the entire surface.

Another embodiment provides a barrier film produced according to the above manufacturing method. The barrier film has a moisture permeability of 1 g / m ² / day or less, for example, 0.9 g / m ² / day or less, excellent moisture barrier properties, and a light transmittance of 85% or more.

Hereinafter, preferred embodiments of the present invention will be described. However, the following examples are only a preferred embodiment of the present invention, and the present invention is not limited by the following examples.

( Barrier  Film production)

Example  One

(1) Graphene oxide prepared by using the Hummers method is added to a mixed solvent of methanol and water in a weight ratio of 4: 1, and dispersed using an ultrasonic sonicator. Further, AIP (aluminum isopropoxide) is added to another solvent in which methanol and water are mixed at a weight ratio of 4: 1 (AIP is added in an amount of 50 parts by weight relative to 100 parts by weight of graphene oxide), and then stirred at 60 DEG C for 1 hour . Thereafter, the two solutions are mixed and reacted at 60 ° C for 6 hours, washed with distilled water and dried at 80 ° C to obtain graphene oxide modified with alumina, that is, graphene-alumina oxide.

(2) TEOS: methanol: water: hydrochloric acid was mixed at a molar ratio of 1: 5: 4: 0.1, respectively, and stirred at room temperature for 3 hours to obtain a silica sol-gel solution. Then, the graphene-alumina oxide was added to the silica sol-gel solution in an amount of 100 to 10,000 parts by weight based on 100 parts by weight of the TEOS, and the mixture was stirred for 1 hour to obtain silica sol- To obtain a mixed solution. The mixed solution of silica sol-gel / graphene-alumina oxide was coated on a 125 μm thick PET film, in particular, the surface of the urethane primer-treated PET film on the surface thereof and dried at 90 ° C. for 3 hours to form a 1 coating layer.

(3) To the THF was added 15 parts by weight of polyvinylidene chloride (PVDC) polymer to 100 parts by weight of THF, and the mixture was stirred at 50 DEG C to obtain a polyvinylidene chloride polymer coating liquid. The polyvinylidene chloride polymer coating liquid was coated on the above-mentioned first coating layer by bar coating and dried at 90 DEG C for 3 hours to prepare a barrier film.

Example  2

Except for the step of further curing the first coating layer by irradiating an excimer lamp (maximum absorption wavelength: 172 nm, scanning speed: 400 mJ / s) after step (2) of Example 1 and before step (3) , A barrier film was produced in the same manner as in Example 1. [

Comparative Example  One

To the THF was added 15 parts by weight of polyvinylidene chloride (PVDC) polymer to 100 parts by weight of THF, and the mixture was stirred at 50 ° C to obtain a polyvinylidene chloride polymer coating liquid. The above polyvinylidene chloride polymer coating solution is coated on a PET film having a thickness of 125 탆, in particular, on the surface of a urethane primer-treated PET film, and dried at 90 캜 for 3 hours to prepare a barrier film.

Comparative Example  2

A barrier film was prepared in the same manner as in Example 1, except that a silica sol-gel solution to which graphene-alumina oxide was not added was used in place of the silica sol-gel solution to which graphene-alumina oxide was added.

Comparative Example  3

A barrier film was prepared in the same manner as in Example 1, except that a silica sol-gel solution to which alumina was added was used instead of the silica sol-gel solution to which graphene-alumina oxide was added.

Comparative Example  4

A barrier film was produced in the same manner as in Example 1, except that the curing conditions of the first coating layer were changed to the atmospheric pressure plasma condition instead of the excimer lamp condition.

(evaluation)

Barrier  Evaluation of film characteristics

The optical characteristics and water permeability (WVTR) of the barrier films according to Example 1, Example 2, and Comparative Examples 1 to 4 were evaluated, and the results are shown in Table 1 below. Specifically, the optical transmittance and haze were measured using a haze meter (Nippon Denshoku, NDH5000) (10 × ¹⁰ cm ² film), and the moisture permeability was measured using a MOCON AQUATRAN 1 model at a relative humidity of 90% (10 x 10 cm < ² > film).

Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Thickness (㎛) 5 5 5 5 5 5 Light Transmittance (%) 90.3 89.6 92.1 91.5 87.6 90.3 Haze (%) 10.1 5.2 NG NG 6.4 16.5 WVTR
(g / m ² / day) 0.9 0.8 1.2 1.4 1.1 2.3

As shown in Table 1, the water permeability of Example 1 is as low as 0.9 g / m ² / day. Example 2 is a barrier film obtained by laminating a PVDC polymer after irradiating the first coating layer of Example 1 with an excimer laser, and it can be confirmed that the haze is greatly reduced as compared with the barrier film of Example 1. [ This indicates that the surface of the silica sol-gel layer as the first coating layer can be partially hardened by the excimer laser to make the surface of the film more robust. In addition, all of the barrier films of Examples 1 and 2 exhibit excellent water barrier properties, while the barrier films of Comparative Examples 1 to 3 do not have excellent moisture barrier properties. In particular, the barrier film of Comparative Example 4 was obtained by curing the silica sol-gel layer as the first coating layer by using atmospheric pressure plasma, but it was confirmed that the PVDC polymer further inhibited the moisture barrier property originally possessed by the PVDC polymer. This indicates that the energy of the strong plasma affects not only the silica sol-gel layer as the first coating layer but also the PET film as the base film to lower the barrier property (moisture barrier property).

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 present invention as defined by the following claims. As will be understood by those skilled in the art. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

Claims (17)

Modifying the graphene oxide with inorganic particles;
Adding graphene oxide modified with the inorganic particles to a silica sol-gel solution;
Coating a silica sol-gel solution to which graphene oxide modified with the inorganic particles is added on a base film to form a first coating layer; And
Coating a polyvinyl polymer on the first coating layer to form a second coating layer
Lt; / RTI >
The step of modifying the graphene oxide with the inorganic particles comprises:
Adding an inorganic particle precursor to a solvent in which graphen oxide is dispersed and stirring the mixture; and
Washing and drying after the stirring
≪ / RTI >
delete The method of claim 1,
Wherein the inorganic particle precursor is added in an amount of 50 parts by weight to 1,000 parts by weight based on 100 parts by weight of the graphene oxide.
The method of claim 1,
Wherein the inorganic particles are aluminum or alumina,
Wherein the inorganic particle precursor is aluminum isopropoxide.
The method of claim 1,
Wherein the graphene oxide is dispersed in a mixed solvent of alcohol and water at a weight ratio of 3: 1 to 5: 1.
The method of claim 1,
Wherein the silica sol-gel solution is a mixed solution of an alkoxide silane precursor, alcohol, water and hydrochloric acid.
The method of claim 6,
Wherein the alkoxide silane precursor is tetraethyl orthosilicate.
The method of claim 6,
The silica sol-
4 to 6 moles of the alcohol, 3 to 5 moles of the water and 0.01 to 0.2 moles of the hydrochloric acid with respect to 1 mole of the alkoxide silane precursor.
The method of claim 6,
Wherein the graphene oxide modified with the inorganic particles is added in an amount of 100 parts by weight to 10,000 parts by weight based on 100 parts by weight of the alkoxide silane precursor.
The method of claim 1,
The step of coating a polyvinyl polymer on the first coating layer to form a second coating layer may include:
And coating the first coating layer with an organic solvent having a polyvinyl polymer dissolved therein to form a second coating layer.
11. The method of claim 10,
Wherein the polyvinyl polymer is contained in an amount of 10 to 20 parts by weight based on 100 parts by weight of the organic solvent.
11. The method of claim 10,
The organic solvent may be selected from the group consisting of N, N-dimethylacetamide (DMAc), N-methyl-2-pyrrolidone (NMP), tetrahydrofuran ), N, N-dimethylformamide (DMF), or a combination thereof.
The method of claim 1,
The polyvinyl polymer may be polyvinyl alcohol (PVA), polyvinylidene chloride (PVDC), ethylene vinyl alcohol (EVOH), polyacrylonitrile (PAN), poly Polychlorotrifluoroethylene (PCTFE), or a combination thereof.
The method of claim 1,
The barrier film manufacturing method comprises:
Before forming the second coating layer after forming the first coating layer,
Irradiating the formed first coating layer with ultraviolet rays having a maximum absorption wavelength at 100 nm to 200 nm at a scanning speed of 300 mJ / s to 500 mJ / s to cure the barrier film.
The method of claim 1,
The base film may be formed of a material selected from the group consisting of polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PC), polycarbonate (PC), poly (methyl methacrylate) , Polyimide (PI), oriented polypropylene (OPP), biaxially oriented polypropylene (BOPP), polyethylene 2,6-dicarboxylate naphthalate (PEN), polyethylene 2,6-dicarboxylate naphthalate, polyethersulfone (PES), polyester, or polystyrene (PS).
The method of claim 1,
Wherein the base film is coated with a urethane primer.
17. A barrier film produced by the method of any one of claims 1 to 16.