KR20170077931A

KR20170077931A - Manufacturing method of the barrier film and barrier film

Info

Publication number: KR20170077931A
Application number: KR1020150187664A
Authority: KR
Inventors: 최종근; 정재은; 이규; 박경민; 김혜민; 노우석; 심유경
Original assignee: 주식회사 상보
Priority date: 2015-12-28
Filing date: 2015-12-28
Publication date: 2017-07-07

Abstract

Preparing a polymer resin solution by dissolving a polymer resin containing a repeating unit represented by the following formula (1) in water; Dissolving the PVDC latex in another water to prepare a PVDC latex solution; Mixing and stirring the polymer resin solution and the PVDC latex solution to prepare a coating solution; Coating and drying the coating liquid on a base film, and a barrier film produced according to the method for producing the barrier film.
[Chemical Formula 1]

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 using the same.

Most food products are composed of organic materials and are widely used now as food packaging materials because they are vulnerable to moisture and other gases and are capable of blocking moisture, oxygen, carbon dioxide, nitrogen, ultraviolet rays, and the like.

Furthermore, since electronic materials used in not only foods but also display devices are sensitive to moisture and gases, the gas barrier materials are also increasingly demanded in the fields of foods and electronics as well as chemicals.

As a gas barrier material, a polymer resin such as polyethylene, polypropylene, or polyvinylidene chloride is widely used. However, the polymer resin alone is insufficient in blocking oxygen and moisture, and in particular, various organic materials used in display devices In the case of materials (devices), moisture and oxygen are very sensitive to moisture, and very tight moisture and gas barrier properties are required.

Accordingly, studies on a barrier film and the like which are excellent in moisture and gas barrier properties have been continued to meet the above-mentioned demand.

One embodiment of the present invention is to provide a method for producing a barrier film that not only has excellent moisture and gas barrier properties under high humidity conditions, but also has excellent external appearance characteristics.

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

In one embodiment, a polymer resin solution is prepared by dissolving a polymer resin containing a repeating unit represented by the following formula (1) in water; Dissolving the PVDC latex in another water to prepare a PVDC latex solution; Mixing and stirring the polymer resin solution and the PVDC latex solution to prepare a coating solution; And coating and drying the coating solution on a base film.

[Chemical Formula 1]

The polymer resin solution containing the repeating unit represented by Formula 1 and the PVDC latex solution may be mixed at a weight ratio of 1: 0.5 to 1: 3.

The polymer resin containing the repeating unit represented by the formula (1) may be contained in an amount of 10 to 20% by weight based on the total amount of the polymer resin solution.

The PVDC latex may be included in an amount of 15% by weight to 30% by weight based on the total amount of the PVDC latex solution.

The PVDC latex may be one prepared using an anionic surfactant.

The polymer resin containing the repeating unit represented by the formula (1) may have a weight average molecular weight of 31,000 g / mol to 50,000 g / mol.

The water may have a pH of 10-12.

The barrier film manufacturing method further includes a step of coating and UV curing a solution in which the polysilsesquioxane is dissolved on the coating layer coated on the substrate film after coating and drying the coating solution on the base film can do.

The polysilsesquioxane may be a polysilsesquioxane having a random structure, polysilsesquioxane having a ladder structure, polysialesquioxane having a cage structure, or a mixture thereof.

The polysilsesquioxane may be a photocurable polysilsesquioxane.

The solution in which the polysilsesquioxane is dissolved may further include a photoinitiator.

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 base film may be one whose surface has been plasma-treated.

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

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

The barrier film manufacturing method according to one embodiment can provide a barrier film having excellent moisture and gas barrier properties under high humidity conditions and at the same time having excellent external appearance characteristics.

1 is a view showing the composition of a coating layer constituting a barrier film according to an embodiment.

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.

Means that at least one hydrogen atom of the functional group of the present invention is substituted with a halogen atom (F, Br, Cl or I), a hydroxy group, a nitro group, a cyano group, an amino group NH _2, NH (R ^200), or N (R ²⁰¹⁾ (R ^202), wherein R ^200, R ²⁰¹ and R ²⁰² are the same or different, each independently being a C1 to C10 alkyl groups), amidino group, A substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted alicyclic alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aryl group, And a substituted or unsubstituted heterocyclic group substituted with at least one substituent selected from the group consisting of a substituted or unsubstituted heterocyclic group.

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

Unless otherwise defined in the chemical formulas in this specification, when no chemical bond is drawn at the position where the chemical bond should be drawn, it means that the hydrogen atom is bonded at the above position.

In addition, unless otherwise defined herein, "*" means the same or different atom or moiety connected to the formula.

In one embodiment, a polymer resin solution is prepared by dissolving a polymer resin containing a repeating unit represented by the following formula (1) in water; Dissolving the PVDC latex in another water to prepare a PVDC latex solution; Mixing and stirring the polymer resin solution and the PVDC latex solution to prepare a coating solution; And coating and drying the coating liquid on a base film.

[Chemical Formula 1]

Representative resins exhibiting gas barrier properties include, for example, ethylene-vinyl alcohol copolymer resin (EVOH), polyvinyl alcohol resin (PVA), and polyvinylidene chloride resin (PVDC). However, the ethylene-vinyl alcohol copolymer resin and the polyvinyl alcohol resin are disadvantageous in that the gas barrier properties are deteriorated under high humidity conditions because of moisture absorption property and dissolution property by moisture.

On the other hand, the polyvinylidene chloride resin exhibits good gas barrier properties even under high humidity conditions due to its low humidity dependence and can be formed by the coating method. Thus, the film coated with the polyvinylidene chloride resin is mainly used for moisture- , And food packaging materials. In addition, a film laminated with a polyvinylidene chloride resin film is used as a gas barrier packaging material for various foods, regardless of whether it is a dried product or a functional product.

However, since a polyvinylidene chloride resin coating liquid for coating is prepared using an organic solvent, it is disadvantageous in terms of unit cost, and is disadvantageous in terms of environmental aspects.

One embodiment solves the aforementioned economic and environmental problems by providing a method of producing a barrier film on a substrate film by coating and curing a coating solution based on a water based system that does not use an organic solvent in a wet coating manner At the same time, a barrier film having excellent barrier properties can be provided. The coating solution is prepared by mixing and stirring a solution in which a polymer resin containing the repeating unit represented by the formula (1) is dissolved in water and a solution in which PVDC latex is dissolved in another water. After coating one material, The barrier property is much better than that of the conventional method of coating a new material on the barrier layer, and the barrier property can be doubled and the appearance characteristics can be improved by using latex type PVDC.

The latex type PVDC may be prepared using a surfactant, such as an anionic surfactant. The latex-type PVDC prepared using the anionic surfactant can be mixed with the polymer resin solution containing the repeating unit represented by the above formula (1) without any precipitation of impurities. Examples of the anionic surfactant include a carboxylate salt compound, a sulfonate salt compound, a sulfuric acid ester salt compound, a phosphoric acid ester salt compound, and a phosphonate salt compound. For example, the anionic surfactant may be a sulfonate salt compound.

More specifically, the principle of the permeation of gas such as water and oxygen through the polymer matrix is that the gas permeates through the polymer resin due to the solubility, the effect of diffusion, and the free volume of the amorphous region in the polymer resin. Thus, the PVDC latex particles having low gas solubility and low permeability coefficient are mixed with the polymer resin containing the repeating unit represented by the above formula (1) to prepare a coating solution so that the amorphous region in the polymer resin and the PVDC latex particles are well mixed It is possible to provide a barrier film excellent in gas barrier properties.

The water may be, for example, DIW. When ultrapure water is used, side reactions due to impurities can be minimized.

For example, the polymer resin containing the repeating unit represented by Formula 1 may have a degree of saponification of 98% or more. In this case, the water, for example, ultrapure water may have a pH of 10 to 12. The polymer resin containing the repeating unit represented by the above formula (1) having a saponification degree of 98% or more contains a large amount of a hydroxyl group as a hydrophilic group and is dissolved only in basic water, for example, water having a pH of 10 to 12.

The polymer resin solution containing the repeating unit represented by Formula 1 and the PVDC latex solution may be contained at a weight ratio of 1: 0.5 to 1: 3. When the PVDC latex solution is contained in an amount of less than 50 parts by weight based on 100 parts by weight of the polymeric resin solution containing the repeating unit represented by the above formula (1), the appearance of the coating surface is excellent but the barrier property is lowered. If the PVDC latex solution is contained in an amount of more than 300 parts by weight based on 100 parts by weight of the polymeric resin solution containing the repeating units, the latex content is increased to cause aggregation of the particles, thereby causing a dot on the outer surface of the coated surface, The characteristics are also undesirably deteriorated.

The polymer resin containing the repeating unit represented by the formula (1) may be contained in an amount of 10 to 20% by weight, for example, 11 to 15% by weight based on the total weight of the polymer resin solution. When the polymer resin containing the repeating unit represented by the formula (1) is contained in an amount of less than 10% by weight based on the total amount of the polymer resin solution, the coating resin is not excellent and the polymer resin containing the repeating unit represented by the formula If it is contained in an amount exceeding 20% by weight based on the total amount of the polymeric resin solution, the viscosity becomes high and the wet coating becomes difficult.

The PVDC latex may be contained in an amount of 15 to 30% by weight, for example, 15 to 25% by weight based on the total weight of the PVDC latex solution. When the PVDC latex is contained in an amount of less than 15% by weight based on the total amount of the PVDC latex solution, the barrier property is deteriorated. When the PVDC latex is contained in an amount of more than 30% by weight based on the total amount of the PVDC latex solution, It may cause deterioration of the barrier property.

The polymer resin containing the repeating unit represented by the formula (1) may have a weight average molecular weight of 31,000 g / mol to 50,000 g / mol. When the weight average molecular weight of the polymer resin containing the repeating unit represented by the formula (1) is less than 31,000 g / mol, not only the physical properties of the polymer itself deteriorate but also the barrier property and coating property are lowered. If the weight average molecular weight of the polymer resin exceeds 50,000 g / mol, dissolution is difficult and it is difficult to prepare the coating liquid.

That is, according to the method for producing a barrier film according to one embodiment, a solution in which a polymer resin containing a repeating unit represented by the formula (1) is dissolved in water and a solution in which PVDC latex is dissolved in another water The mixed and stirred aqueous coating solution is coated and dried to produce a barrier film composed of a base film and a coating layer positioned on the base film. The coating layer is formed by coating and drying the aqueous coating solution, and constitutes a water-based coating layer.

The polymer resin containing the repeating unit represented by the formula (1) may be a PVA resin.

The stirring may be carried out at room temperature for 30 minutes to 120 minutes, but is not limited thereto.

The coating may be applied to a substrate by spin coating, dip coating, casting, microgravure coating, gravure coating, bar coating, roll coating, slot die coating, wire bar coating, spray coating, screen printing, And any of known coating methods such as a spray coating method and the like, but the present invention is not limited thereto. For example, the coating may be a bar coating.

The aqueous coating solution may be coated on the base film to a thickness of 1 to 20 [mu] m, for example, 1 to 10 [mu] m. When an aqueous coating solution is coated to a thickness within the above-mentioned range, cracking of the film is prevented, and it is advantageous in terms of processability, gas permeability and optical characteristics.

The drying may be carried out in a vacuum oven or by using a higgan or a hot plate, but the drying method is not limited thereto. The drying may be carried out at 40 ° C to 90 ° C for 1 day to 5 days, but is not limited thereto. That is, the water-based coating layer can be cured through thermal curing.

Furthermore, the barrier film production method may further include a step of coating and drying the aqueous coating solution on the substrate film, and then coating and curing a solution of the polysilsesquioxane dissolved on the aqueous coating layer coated on the substrate film As shown in FIG. The curing may be curing by irradiating ultraviolet rays.

For example, the ultraviolet ray irradiation can be performed for 30 seconds to 5 minutes, but is not limited thereto. In addition, the maximum absorption wavelength of the ultraviolet ray may be 300 nm to 400 nm, but is not limited thereto.

Wherein the polysilsesquioxane is a repeating unit represented by * -R ¹ SiO ₁ _.5 - * wherein R ¹ is a hydrogen atom, a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C2 to C10 alkenyl group, And combinations thereof).

The polysilsesquioxane may be a polysilsesquioxane having a random structure, polysilsesquioxane having a ladder structure, polysialesquioxane having a cage structure, or a mixture thereof. The polysilsesquioxane in the form of a mixture is easier to prepare than the polysilsesquioxane having a single structure.

For example, the polysilsesquioxane may be a photocurable polysilsesquioxane, and the solution in which the polysilsesquioxane is dissolved may further comprise a photoinitiator. In this case, the curing of the polysilsesquioxane is cured by photo-curing, for example, irradiation with ultraviolet rays, so that curing is caused by a different path from the above-mentioned water-based coating layer where thermosetting occurs, and a barrier having a more dense three- A film can be obtained.

The photoinitiator may be, for example, an acetophenone compound, a benzophenone compound, a thioxanone compound, a benzoin compound, a triazine compound, a oxime compound or a combination thereof.

Examples of the acetophenone-based compound include 2,2'-diethoxyacetophenone, 2,2'-dibutoxyacetophenone, 2-hydroxy-2-methylpropiophenone, pt-butyltrichloroacetophenone, dichloro-4-phenoxyacetophenone, 2-methyl-1- (4- (methylthio) phenyl) -2-morpholinopropanone, p-butyldichloroacetophenone, 1-one, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butan-1-one.

Examples of the benzophenone compound include benzophenone, benzoyl benzoic acid, methyl benzoyl benzoate, 4-phenylbenzophenone, hydroxybenzophenone, acrylated benzophenone, 4,4'-bis (dimethylamino) benzophenone, '-Bis (diethylamino) benzophenone, 4,4'-dimethylaminobenzophenone, 4,4'-dichlorobenzophenone, and 3,3'-dimethyl-2-methoxybenzophenone.

Examples of the thioxanthone compound include thioxanthone, 2-methylthioxanthone, isopropylthioxanthone, 2,4-diethylthioxanthone, 2,4-diisopropylthioxanthone, 2- Chlorothioxanthone and the like.

Examples of the benzoin compound include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, and benzyl dimethyl ketal.

Examples of the triazine-based compound include 2,4,6-trichloro-s-triazine, 2-phenyl 4,6-bis (trichloromethyl) (Trichloromethyl) -s-triazine, 2- (4'-methoxynaphthyl) -4,6-bis (trichloromethyl) Bis (trichloromethyl) -s-triazine, 2- (p-tolyl) -4,6-bis (trichloromethyl) Bis (trichloromethyl) -s-triazine, bis (trichloromethyl) -6-styryl-s-triazine, 2- (naphtho- Bis (trichloromethyl) -s-triazine, 2- (4-methoxynaphtho-1-yl) (Trichloromethyl) -6- (4-methoxystyryl) -s-triazine, and the like.

Examples of the oxime compounds include O-acyloxime compounds, 2- (o-benzoyloxime) -1- [4- (phenylthio) phenyl] -1,2-octanedione, 1- ) -1- [9-ethyl-6- (2-methylbenzoyl) -9H-carbazol-3-yl] ethanone, O-ethoxycarbonyl- Etc. may be used. Specific examples of the O-acyloxime-based compound include 1,2-octanedione, 2-dimethylamino-2- (4-methylbenzyl) -1- (4-morpholin- (4-phenylsulfanylphenyl) -butane-1,2-dione 2-oxime-O-benzoate, 1- -Oxime-O-benzoate, 1- (4-phenylsulfanylphenyl) -octane-1-one oxime-O-acetate and 1- (4-phenylsulfanylphenyl) Acetate and the like.

The photoinitiator may be a carbazole compound, a diketone compound, a sulfonium borate compound, a diazo compound, an imidazole compound or a nonimidazole compound in addition to the above compounds.

The photoinitiator may be used in combination with a photosensitizer that absorbs light to be excited, and then transfers the energy to generate a chemical reaction.

Examples of the photosensitizer include tetraethylene glycol bis-3-mercaptopropionate, pentaerythritol tetrakis-3-mercaptopropionate, dipentaerythritol tetrakis-3-mercaptopropionate and the like .

The solvent for dissolving the polysilsesquioxane may be any solvent that can dissolve the photoinitiator together with the polysilsesquioxane, and there is no limitation on the solvent. For example, the solvent for dissolving the polysilsesquioxane is an organic solvent such as N, N-dimethylacetamide (DMAc), N-methyl-2-pyrrolidone -2-pyrrolidone, tetrahydrofuran (THF), N, N-dimethylformamide (DMF), toluene, xylene, methyl ethyl ketone ketone, or combinations thereof.

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). However, the present invention is not limited thereto.

In addition, the base film may be a plasma surface-treated. The plasma surface treatment may be atmospheric plasma at a gas flow rate of 0.01 L / min to 100 L / min, a substrate flow rate of 0.1 m / min to 1000 m / min, or a vacuum of 20 W to 50 Pa at a power of 100 W to 5000 W. However, In order to continuously treat the surface treatment and to reduce the process cost, it is easy to treat it at normal pressure. In the case of the atmospheric plasma, a method of irradiating the surface of the substrate with a nitrogen gas, an oxygen gas, or a mixed gas thereof, specifically, an oxygen gas, And there is a method in which plasma is made through gas. On the other hand, the plasma surface treatment time may be 1 minute to 10 minutes. When the substrate subjected to the plasma surface treatment is used, excellent adhesion in the barrier film can be secured.

The film may have a thickness of 125 탆 or less, for example, 50 탆 or more and 125 탆 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-described barrier film production method.

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.

(Preparation of aqueous coating solution)

Manufacturing example One

The PVA resin (Aldrich, M _w = 31,000 g / mol to 50,000 g / mol) is dissolved in 13% by weight of DI water at pH 11. The PVDC latex (Solvay, Difon B-204 grade) prepared using anionic surfactant is dissolved in another DI water (20 wt%). The two solutions (PVA resin-dissolved solution and PVDC latex-dissolved solution) were mixed at a weight ratio of 1: 1 and stirred at room temperature for 1 hour to prepare an aqueous coating solution.

Manufacturing example 2

An aqueous coating solution was prepared in the same manner as in Preparation Example 1, except that a solution in which the PVA resin was dissolved and a solution in which the PVDC latex was dissolved were mixed at a weight ratio of 1: 2.

Manufacturing example 3

An aqueous coating solution was prepared in the same manner as in Production Example 1, except that a solution in which the PVA resin was dissolved and a solution in which the PVDC latex was dissolved were mixed at a weight ratio of 1: 3.

Manufacturing example 4

An aqueous coating solution was prepared in the same manner as in Preparation Example 1, except that a solution in which the PVA resin was dissolved and a solution in which the PVDC latex was dissolved was mixed at a weight ratio of 2: 1.

Manufacturing example 5

An aqueous coating solution was prepared in the same manner as in Production Example 1, except that a solution in which the PVA resin was dissolved and a solution in which the PVDC latex was dissolved were mixed at a weight ratio of 1: 0.4.

Manufacturing example 6

An aqueous coating solution was prepared in the same manner as in Production Example 1, except that a solution in which the PVA resin was dissolved and a solution in which the PVDC latex was dissolved were mixed at a weight ratio of 1: 3.5.

( Barrier Film production)

Example One

A PET film having a thickness of 125 탆 was subjected to plasma treatment, and then an aqueous coating solution of Production Example 1 was bar coated. After the coating, the substrate was dried in an oven at 50 ° C. for 3 days, and a polysilsesquioxane solution was bar-coated on the dried surface. Thereafter, the film was dried in an oven at 80 캜 for one minute and irradiated with UV (? = 365 nm) for one minute to prepare a barrier film.

Example 2

A barrier film was produced in the same manner as in Example 1, except that the aqueous coating solution of Preparation Example 2 was used instead of the aqueous coating solution of Preparation Example 1.

Example 3

A barrier film was prepared in the same manner as in Example 1, except that the aqueous coating solution of Preparation Example 3 was used in place of the aqueous coating solution of Production Example 1.

Example 4

A barrier film was produced in the same manner as in Example 1, except that the aqueous coating solution of Preparation Example 4 was used in place of the aqueous coating solution of Production Example 1.

Example 5

A barrier film was produced in the same manner as in Example 1, except that the aqueous coating solution of Preparation Example 5 was used in place of the aqueous coating solution of Production Example 1.

Example 6

A barrier film was prepared in the same manner as in Example 1, except that the aqueous coating solution of Preparation Example 6 was used in place of the aqueous coating solution of Production Example 1.

Comparative Example One

The PVA resin (Aldrich, M _w = 40,000 g / mol) is dissolved in 13% by _weight of DI water at pH 11. The PVDC latex (Solvay, Difon B-204 grade) prepared using anionic surfactant is dissolved in another DI water (20 wt%). The solution in which the PVA resin was dissolved was coated on a 125 탆 thick plasma treated PET film and dried at 90 캜 for 3 hours to form a PVA resin coating layer. A solution of the PVDC latex dissolved on the PVA resin coating layer was bar coated and dried in an oven at 50 캜 for 3 days to form a PVDC latex coating layer. A polysilsesquioxane solution was bar coated on the PVDC latex coating layer. Thereafter, the substrate was dried in an oven at 80 DEG C for 1 minute and irradiated with UV (? = 365 nm) for 1 minute to prepare a barrier film.

Comparative Example 2

The PVA resin (Aldrich, M _w = 40,000 g / mol) is dissolved in 13% by _weight of DI water at pH 11. The solution in which the PVA resin was dissolved was coated on a 125 탆 thick plasma treated PET film and dried at 90 캜 for 3 hours to form a PVA resin coating layer. A polysilsesquioxane solution was bar coated on the PVA resin coating layer. Thereafter, the substrate was dried in an oven at 80 DEG C for 1 minute and irradiated with UV (? = 365 nm) for 1 minute to prepare a barrier film.

Comparative Example 3

PVDC latex (Solvay, Difon B-204 grade) prepared using anionic surfactant is dissolved in DI water at 20 wt%. The solution in which the PVDC latex was dissolved was coated on a 125 탆 thick plasma treated PET film and dried in an oven at 80 캜 for 3 hours to form a PVDC latex coating layer. A polysilsesquioxane solution was bar coated on the PVDC latex coating layer. Thereafter, the substrate was dried in an oven at 80 DEG C for 1 minute and irradiated with UV (? = 365 nm) for 1 minute to prepare a barrier film.

(evaluation)

Evaluation 1: Evaluation of water vapor permeability

The water vapor transmission rate of the barrier film according to Examples 1 to 6 and Comparative Examples 1 to 3 was measured at a temperature of 40 DEG C and a relative humidity of 100% using a moisture permeability measurement equipment of MOCON, USA And the results are shown in Table 1 below.

Evaluation 2: Appearance evaluation

The dots (foreign matters) on the barrier film according to Examples 1 to 6 and Comparative Examples 1 to 3 were visually evaluated, and the results are shown in Table 1 below. The evaluation criteria are as follows.

(Appearance evaluation standard)

Excellent (○): No foreign substance was observed on the surface of the barrier film visually

Normal (△): Observation of foreign matter on the surface of the barrier film (less than 20%)

Defective (X): Observed most (more than 80%) visually on the surface of the barrier film

Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Comparative Example 3 WVTR (g / m ² / day) 0.50 0.90 1.30 0.87 2.32 2.50 3.30 5.00 3.10 Exterior ○ ○ ○ ○ ○ △ △ ○ △ The base film (125 탆 thick PET) has a WVTR of 5.0 g / m ² / day

It can be seen from the above Table 1 that the barrier films according to Examples 1 to 6 have superior moisture barrier properties and appearance characteristics even under the high humidity conditions than the barrier films according to Comparative Examples 1 to 3. [ Furthermore, since the barrier properties and appearance characteristics of the barrier films according to Examples 1 to 4 are superior to those of the barrier films according to Examples 5 and 6, the PVA resin solution and the PVDC latex It can be confirmed that when the solution is contained at a weight ratio of 1: 0.5 to 1: 3, better moisture barrier properties and appearance characteristics can be achieved.

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

Preparing a polymer resin solution by dissolving a polymer resin containing a repeating unit represented by the following formula (1) in water;
Dissolving the PVDC latex in another water to prepare a PVDC latex solution;
Mixing and stirring the polymer resin solution and the PVDC latex solution to prepare a coating solution;
Coating and drying the coating liquid on the base film
&Lt; / RTI >
[Chemical Formula 1]

The method of claim 1,
Wherein the polymer resin solution containing the repeating unit represented by Formula 1 and the PVDC latex solution are mixed at a weight ratio of 1: 0.5 to 1: 3.

The method of claim 1,
Wherein the polymer resin comprising the repeating unit represented by the formula (1) is contained in an amount of 10% by weight to 20% by weight based on the total amount of the polymer resin solution.

The method of claim 1,
Wherein the PVDC latex is contained in an amount of 15 to 30 wt% based on the total amount of the PVDC latex solution.

The method of claim 1,
Wherein the PVDC latex is prepared using an anionic surfactant.

The method of claim 1,
Wherein the polymer resin comprising the repeating unit represented by Formula 1 has a weight average molecular weight of 31,000 g / mol to 50,000 g / mol.

The method of claim 1,
Wherein the water has a pH of from 10 to 12.

The method of claim 1,
The barrier film manufacturing method comprises:
After coating and drying the coating liquid on the base film,
Further comprising coating and ultraviolet curing a solution of polysilsesquioxane dissolved on the coating layer coated on the substrate film.

9. The method of claim 8,
The polysilsesquioxane may be a polysilazquioxane having a random structure, polysilsesquioxane having a ladder structure, polysersquioxane having a cage structure, or a mixture thereof. Way.

9. The method of claim 8,
Wherein the polysilsesquioxane is a photocurable polysilsesquioxane.

9. The method of claim 8,
Wherein the solution in which the polysilsesquioxane is dissolved further comprises a photoinitiator.

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 surface of the base film is subjected to a plasma treatment.

14. A barrier film produced by the method for producing a barrier film according to any one of claims 1 to 13.