KR102655304B1 - PVC adhesive film and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a PVC adhesive film and a method of manufacturing the same, wherein a release paper, an adhesive layer, and a PVC layer are sequentially laminated, and the adhesive layer is formed of an adhesive composition containing a hot melt adhesive and a flame retardant.

Description

PVC adhesive film and manufacturing method thereof}

The present invention relates to a PVC adhesive film and a manufacturing method thereof, and specifically to a PVC adhesive film and a manufacturing method thereof that are environmentally friendly and flame retardant and realize excellent adhesive and construction properties through hot melt adhesion.

PVC adhesive film, which is made of PVC as a base material, adds aesthetic designs such as various wood patterns, and is adhesive-treated on the back, has an excellent design and is easy to construct, so it is mainly used in commercial and office spaces. Recently, as PVC adhesive films have begun to be used for residential purposes, there is a need to provide more eco-friendly interior films. However, conventional PVC adhesive films use volatile organic compounds (VOC), which has the problem of causing sick building syndrome when installed indoors. When volatile organic compounds coexist with nitrogen oxides in the atmosphere, they undergo a photochemical reaction under the action of sunlight, generating photochemical oxidizing substances such as ozone and PAN (peroxyacetyl nitrate), which cause photochemical smog. It refers to the term collectively. These are air pollutants, toxic chemicals with carcinogenic properties, and are precursors of photochemical oxides. Additionally, they are the cause of global warming and also cause bad odors. Therefore, it is necessary for PVC adhesive films that can be used in residential or commercial spaces closely related to human life to reduce TVOC. Additionally, since it is installed indoors, it is necessary to achieve excellent flame retardant performance. When a UV adhesive is used in a PVC adhesive film, the effect of reducing TVOC cannot be obtained, and when a water-based adhesive is used to reduce TVOC, TOVC can be reduced, but there is a problem in that the adhesive properties are deteriorated.

The present invention was developed to solve the above problems, and its goal is to provide a PVC adhesive film that is eco-friendly and flame retardant by using a solvent-free hot melt adhesive, and has excellent adhesion and constructability, and a method for manufacturing the same.

The PVC adhesive film of the present invention is characterized in that a release paper, an adhesive layer, and a PVC layer are laminated in that order, and the adhesive layer is formed of an adhesive composition containing a hot melt adhesive and a flame retardant.

In addition, the method for producing a PVC adhesive film of the present invention includes the steps of (a) heating and melting an adhesive composition containing a hot melt adhesive and a flame retardant; (b) applying the adhesive composition to the upper surface of the release paper; (c) forming an adhesive layer by photocuring the adhesive composition by irradiating ultraviolet rays; (d) laminating a PVC layer on the upper surface of the adhesive layer.

The PVC adhesive film of the present invention has the effect of reducing the TVOC of the entire interior film so that it can be used regardless of residential or commercial use, and thus has excellent environmental friendliness and does not cause problems such as sick building syndrome. In addition, it has excellent flame retardancy, adhesion and workability.

Hereinafter, the PVC adhesive film of the present invention and its manufacturing method will be described in detail.

The PVC adhesive film according to one embodiment of the present invention includes a release paper, an adhesive layer, and a PVC layer stacked in that order.

The adhesive layer is formed of an adhesive composition containing a hot melt adhesive and a flame retardant.

The hot melt adhesive includes an acrylate copolymer. The acrylate copolymer is produced by polymerizing at least one acrylate monomer.

The acrylate monomer includes C1 to C18 alkyl (meth)acrylate. The C1 to C18 alkyl (meth)acrylate is one selected from the group consisting of methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, and 2-ethylhexyl (meth)acrylate. It could be more than that.

The adhesive composition may further include acetophenone, benzoin, thioxanthone, ancraquinone, acylphosphine oxide, or benzophenone as a photoinitiator. The photoinitiator may be bound to the side chain of the acrylate copolymer.

The photoinitiator is acetophenone, such as 4-phenoxydichloroacetophenone, diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-(4-isopropylphenyl) -2-Hydroxy-2-methylpropan-1-one, 1-hydroxycyclohexylphenyl ketone, 4-(2-hydroxyethoxy)-phenyl(2-hydroxy-2-propyl)ketone, 2- Methyl-[4-(methylthio)phenyl]-2-morpholino-1-propanone or 2,2-dimethoxy-2-phenylacetophenone can be used.

The photoinitiator may be benzoin, benzoin methyl ether, benzoin isoethyl ether, benzoin isopropyl ether, or benzoin isobutyl ether.

The photoinitiator includes thioxanthone, such as thioxanthone, 2-chlorothioxanthone, 2,4-dichlorothioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, and 2,4-diethyl. Thioxanthone, isopropylthioxanthone, or 2,4-diisopropylthioxanthone can be used.

The photoinitiator is an ancraquinone such as 4,4'-dimethylaminothioxanthone, 4,4'-diethylaminobenzophenone, α-acyloxime ester, benzyl, methylbenzoyl formate or 2-ethylanthraquinone. You can.

The photoinitiator may be an acylphosphine oxide such as 2,4,6-trimethylbenzoyldiphenylphosphine oxide or bis(2,4,6-trimethyl benzoyl)-phenylphosphine oxide.

The photoinitiator includes benzophenones, such as benzophenone, benzoylbenzoic acid, methyl benzoylbenzoate, 4-phenylbenzophenone, hydroxy benzophenone, 4-benzoyl-4'-methyldiphenyl sulfide, or 3,3'-dimethyl-4-mer. Toxybenzophenone or benzophenone derivatives can be used.

The benzophenone derivative is an unsaturated compound such as 4-acryloyloxy benzophenone or O-acryloyl acetophenone oxime in order to be polymerized inside the chain of the acrylate copolymer. It may include a group. Since the 4-acryloyloxy benzophenone is composed of an unsaturated group and benzophenone, it can be copolymerized with acrylate monomer. Therefore, the benzophenone group of the side chain of the acrylate copolymer is crosslinked in the process of recapturing hydrogen from the acrylate monomer containing the hydrogen donating group upon UV irradiation.

The photoinitiator is preferably included in an amount of 1 to 10 parts by weight based on 100 parts by weight of the acrylate copolymer.

The hot melt adhesive may further include a tackifier. The tackifier may be one or more selected from the group consisting of rosin resin, hydrogenated rosin resin, terpene resin, styrene-added terpene resin, terpene phenol resin, phenol resin, and hydrocarbon resin. The hydrocarbon resin preferably has 5 to 9 carbon atoms, and specifically includes aliphatic (C5-based), aromatic (C9-based), copolymers of the aliphatic and aromatic hydrocarbon resins, and hydrogenated aromatic hydrocarbon resins. I can hear it.

The hot melt adhesive may further include wax. The wax may be one or more types selected from the group consisting of paraffin wax, polyethylene wax, etc.

The hot melt adhesive may further include at least one selected from plasticizers, fillers, antioxidants, etc., and may be selected and included without limitation as long as it does not impair the purpose of the present invention.

The flame retardant may be at least one selected from organic flame retardants and inorganic flame retardants. Preferably, the flame retardant may include one type of organic flame retardant and one type of inorganic flame retardant.

The organic flame retardant may be at least one selected from phosphorus-based flame retardants, nitrogen-based flame retardants, and halogen-based flame retardants.

The phosphorus-based flame retardants include resorcin diphosphate, bisphenol-A-diphosphate, triphenylphosphate, ethylene diamine diphosphate, and diethylaluminum phosphinate. (di-ethyl-aluminium phosphinate), aluminum phosphinate, aluminum phosphite, aluminum phosphonate and phosphonate ester (phos-phonate ester) selected from the group consisting of It is one or more types of compounds.

The nitrogen-based flame retardants include melamine cyanurate, melamine phosphate, melamine polyphosphate, melamine-metal-phosphate, and melamine aluminum phosphate. and one or more compounds selected from the group consisting of melamine magnesium phosphate.

The halogen-based flame retardant is at least one selected from bromine-based flame retardants and phosphorus-based flame retardants.

The brominated flame retardant is one or more compounds selected from the group consisting of tribromophenoxyethane (DBDPE), tetrabromobisphenol A (TBBA), etc.

The chlorine-based flame retardant is one or more compounds selected from the group consisting of chlorinated paraffin, chlorinated polyethylene, and aliphatic chlorine-based flame retardant.

The inorganic flame retardant may be at least one selected from aluminum-based flame retardants, antimony-based flame retardants, and magnesium-based flame retardants, and preferably antimony oxide, antimony trioxide, antimony pentoxide, calcium carbonate, zinc borate, aluminum hydroxide, or magnesium hydroxide is used. You can.

In one embodiment of the present invention, the flame retardant preferably includes antimony trioxide (Sb ₂ O ₃₎ and a halogen-based flame retardant. Antimony trioxide, when used in combination with halogen-based flame retardants, exhibits a flame retardant multiplication effect, has excellent flame retardancy, and is economical.

Sb2O3+2HX→2SbOX+H2O[~250℃]

5SbOX→2SbOX-Sb2O3+SbX3[240~300℃]

4(2SbOX-Sb2O3)→5(SbOX-Sb2O3)+SbX3 [340~380℃]

3(SbOX-Sb2O3)→4Sb2O3+SbX3 [380~450℃]

Since the surface temperature of the burning polymer is usually around 400°C, antimony trioxide is very advantageous in terms of flame retardant efficiency according to the above reaction. In other words, if only the halogen-based compound is applied alone, the halogen-based compound may be decomposed and consumed at once under certain conditions depending on the binding energy, but when antimony trioxide is used together, it can exhibit flame retardancy over a wide temperature range during combustion. Creates an environment. In addition, the high specific gravity of the generated Sb

The antimony trioxide and halogen-based flame retardant are preferably mixed in a ratio of 1:3 to 1:10. More preferably, they can be mixed in a ratio of 1:3. The flame retardant effect of inorganic flame retardants such as antimony trioxide increases when used with halogen flame retardants. When using antimony trioxide alone, the flame retardant effect does not increase even if the content is increased, and when using the halogenated flame retardant alone, the flame retardant effect increases as the content increases. However, the flame retardant effect does not increase as much as when halogen-based flame retardants are prescribed with a small amount of antimony trioxide. As antimony trioxide is added to the halogen-based flame retardant, the reaction temperature range expands, resulting in a more efficient flame retardant effect. Therefore, the mixing ratio of antimony trioxide to halogen-based flame retardant is preferably 1:3 to 1:10.

In one embodiment of the present invention, the flame retardant preferably includes zinc stannate and nonflammable silicate. Zinc stannate and silicate are more environmentally friendly than using halogen-based flame retardants. Zinc stannate is in a gaseous state at the beginning of combustion, blocking the inflow of oxygen required for combustion, and then plays the role of blocking oxygen and heat through the formation of char. Silicate is an odorless, pollution-free, eco-friendly, alkaline natural raw material that prevents the growth of bacteria and mold harmful to the human body and has the effect of sterilizing it. It has excellent weather resistance, durability, and flame retardancy, and penetrates into inorganic materials such as concrete and bricks, causing physical and chemical damage. By forming a bond, it serves to further strengthen the surface strength of the base material. Therefore, the non-combustible silicate gives strength to the formed char and fills the pores of the tightly formed char, further enhancing the effect of blocking oxygen, etc.

The zinc stannate and the non-combustible silicate are preferably mixed in a ratio of 1:1 to 1:3. More preferably, it can be mixed at a ratio of 1:1. Zinc tartrate can be used as a substitute for antimony trioxide, and nonflammable silicate is added to increase the flame retardant performance of zinc tartrate. The non-combustible silicate is vitrified to block heat and oxygen and increases the reaction time of zinc stannate at a certain temperature, helping flame retardant performance. Therefore, the mixing ratio of zinc stannate to non-combustible silicate is preferably 1:1 to 1:3.

However, the above-mentioned flame retardant is only an embodiment of the present invention, and in addition to the above components, conventional flame retardants may be appropriately selected and used depending on the intended use.

The flame retardant may preferably be included in an amount of 1 to 50 wt% compared to the adhesive composition. More preferably, it is contained in 10 to 20 wt%. If the flame retardant is included in less than 1 wt%, there is a risk that the desired flame retardancy and flame retardancy may not be secured, and if it is included in more than 50 wt%, there is a risk that the adhesive properties of the adhesive composition may be deteriorated.

The adhesive composition containing the hot melt adhesive and the flame retardant is heated and melted.

The hot melt adhesive preferably has a viscosity of 50 Pa·s or less at about 130°C. More preferably, it may be 20 to 50 Pa·s, and most preferably, it may be 20 to 30 Pa·s. It has a low viscosity at a temperature of about 130 ℃, so it can be used in a hot melt method, and heat shrinkage is very low, so it can be directly coated on release paper, simplifying the manufacturing process.

The hot melt adhesive has a glass transition temperature (Tg) of -50°C to -20°C. By having a glass ion temperature within the above range, there is room temperature adhesiveness. Unlike the prior art, the hot melt adhesive of the present invention has adhesive strength at room temperature, making it easier to disperse the flame retardant by melting at room temperature, thereby improving flame retardancy.

The adhesive composition containing the hot melt adhesive is a solvent-free adhesive composition. That is, since the adhesive composition of the present invention is a solvent-free adhesive composition with a solid content of 99% by weight or more because it does not use water or solvents, it can provide an eco-friendly PVC adhesive film with a very low TVOC value compared to the solvent type.

After the molten adhesive composition is evenly applied to the upper surface of the release paper, the adhesive composition is photo-cured by irradiating ultraviolet rays to form a film to form an adhesive layer.

The adhesive composition is preferably applied at a thickness of 20 to 100 ㎛, and more preferably at a thickness of 20 to 60 ㎛.

When an adhesive composition containing a hot melt adhesive is cured through a general drying or aging process, there is a risk that the filmed adhesive layer may be re-melted by reheating. Therefore, in the present invention, the adhesive composition is photocured by irradiating ultraviolet rays with a wavelength of 340 nm or less using a mercury lamp or an ultraviolet lamp, or preferably by irradiating ultraviolet rays with a wavelength of 220 to 280 nm, so that the adhesive has high cohesion. (cohension), thereby preventing re-melting of the adhesive layer. Accordingly, the adhesive properties of the PVC adhesive film do not change significantly depending on temperature, ensuring stable adhesive properties. At this time, the light intensity can be adjusted according to the height of the UV lamp, etc., and the light amount can be adjusted according to the type and wavelength range of the lamp and the number of lamps, and the coating and curing speed can be adjusted accordingly.

The thickness of the release paper is preferably 100 to 200 ㎛. If the thickness of the release paper is within the above range, the possibility of defects such as tearing is low and it is suitable for coating and curing the adhesive composition on one side of the release paper.

The thickness of the adhesive layer is preferably 20 to 60 ㎛. When the thickness of the adhesive layer is within the above range, the PVC adhesive film can exhibit excellent adhesive properties without being thicker than necessary.

The thickness of the PVC layer is preferably 100 to 200 ㎛. If the thickness of the PVC layer is within the above range, the possibility of defects such as tearing is low and the product cost does not become excessive.

The PVC layer preferably contains a flame retardant. The PVC adhesive film of the present invention can maximize flame retardancy and flame retardancy effects by including a flame retardant in both the PVC layer and the adhesive layer. The types of flame retardants that can be included in the PVC layer are the same as the flame retardants described above, and the flame retardants included in the PVC layer and the adhesive layer may be the same or different from each other.

The PVC adhesive film of the present invention is characterized by a TVOC of 0.2 mg/m ² ·h or less. More preferably, it is 0.1 mg/m ² ·h or less. PVC adhesive film uses a solvent-free hot melt adhesive resin and has a very low TVOC, making it highly eco-friendly.

The PVC adhesive film of the present invention has adhesive properties of 1500 g/in or more. Preferably it is 1700 g/in or more. The PVC adhesive film has excellent adhesive properties.

When using a water-based adhesive resin, if a flame retardant is included to achieve flame retardant performance, there is a problem in that the adhesive properties are lowered because particles exist on the surface and the adhesion area is reduced. However, the present invention provides flame retardant performance when using a hot melt adhesive. Even if flame retardants are included to achieve this, the adhesive properties do not deteriorate.

The PVC adhesive film of the present invention has a shrinkage rate of 0.3 mm or less. Preferably it is 0.01mm to 0.3mm. Since the adhesive composition is photocured by irradiating ultraviolet rays to form an adhesive layer, the adhesive layer does not re-melt or deform even in a high temperature environment.

The method for manufacturing a PVC adhesive film according to an embodiment of the present invention includes the following steps.

(a) heating and melting an adhesive composition containing a hot melt adhesive and a flame retardant;

(b) applying the adhesive composition to the upper surface of the release paper;

(c) forming an adhesive layer by photocuring the adhesive composition by irradiating ultraviolet rays;

(d) laminating a PVC layer on the upper surface of the adhesive layer;

In step (a), the melting temperature may be about 130°C or higher. The adhesive composition has a very low viscosity of 50 Pa·s or less at about 130°C. Therefore, it can be used as a hot melt method.

In step (c), the adhesive composition has high cohesion by irradiation with ultraviolet rays, thereby forming an adhesive layer. The adhesive composition becomes a polymer through curing by a radical reaction with a wavelength of ultraviolet rays of 220 to 280 nm.

The description of the release paper, adhesive layer, and PVC layer of the method for producing the PVC adhesive film of the present invention is the same as described above and will be omitted hereinafter.

The present invention will be explained in more detail by examples. However, the following examples only illustrate the present invention, and the content of the present invention is not limited by the following examples.

Examples and Comparative Examples

Example 1

The temperature of the solvent-free adhesive composition, which is a mixture of 90 wt% of acrylate resin and 10 wt% of flame retardant, is melted by raising the temperature to 130°C to have a viscosity of 50 Pa·s or less, and coated with a thickness of 40 ㎛ on the upper surface of the release paper. The adhesive composition is photo-cured by irradiating a UV light source of 220 to 280 nm using a UV lamp to form an adhesive layer, and then laminated with a PVC film containing a flame retardant to produce a PVC adhesive film.

Example 2

A PVC adhesive film was prepared in the same manner as Example 1, except that 20 wt% of flame retardant was mixed with 80 wt% of acrylate resin.

Comparative Example 1

A PVC adhesive film was manufactured in the same manner as Example 1, except that UV adhesive resin was used instead of acrylate resin.

Comparative Example 2

A PVC adhesive film was prepared in the same manner as Example 1, except that water-based adhesive resin was used instead of acrylate resin.

Comparative Example 3

A PVC adhesive film was prepared in the same manner as Example 1, except that the flame retardant was not included in 100 wt% of acrylate resin.

Comparative Example 4

A PVC adhesive film was prepared in the same manner as Example 1, except that 60 wt% of flame retardant was mixed with 40 wt% of acrylate resin.

Experiment example

(1) Experimental Example 1: TVOC measurement

A sample cut to 200 After 6 hours, the air is collected, 3 L is collected in a Tenax Tube, and the collected gas is analyzed by ATD-GCMS (manufacturer: Perkin Elmer, model name: Turbomatrix 650 / Clarus 680 / SQ8T).

(2) Experimental Example 2: Flame retardant performance measurement

Measured using a cone calorimeter (manufacturer: FTT) using the KS F ISO 5660 test method. Cut the PVC adhesive film into 100 The radiant heat is set and maintained at 50kW and the discharge flow rate is 0.024m2/s. After inserting the ignition source, leave the sample for 10 minutes and measure the maximum heat release rate and total heat release rate.

(3) Experimental Example 3: Measurement of adhesive properties

1. Peel force measurement

A specimen cut from PVC adhesive film to 25 After leaving at room temperature for 20 minutes, measure the peeling force at 180°C at a speed of 300 mm/min.

2. Creep measurement

A specimen cut from PVC adhesive film to 25 When attaching, perform 5 round trips using a 2kg roller. Measure the time for the PVC adhesive film to fall off by hanging it at 90°C with stainless steel (SUS) on a 30mm section where a 500g weight is not attached.

3. Measurement of aging properties

The PVC adhesive film is left at 70℃ for 3 days and the adhesive properties are measured by peeling force and creep to evaluate the degree of aging.

(4) Experimental Example 4: Measurement of shrinkage rate

Cut the PVC adhesive film into 50 After leaving for 2 hours at 100℃ and leaving for 1 hour at room temperature, measure the gap between the crosses in the MD/TD direction.

The experimental results for Examples 1 to 2 and Comparative Examples 1 to 4 are shown in Table 1 below.

division Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Adhesive resin type hot melt hot melt UV Mercury hot melt hot melt Flame retardant content (wt%) 10 20 10 10 0 60 TVOC (mg/m ² ·h) 0.08 0.07 0.26 0.07 0.07 0.08 Flame retardant performance Good Good Good Good error Good Adhesive properties (g/in) 1,820 1,730 1,950 1,670 1750 1430 Shrinkage rate (mm) 0.3 0.3 0.35 0.55 0.4 0.25

The PVC adhesive film according to Examples 1 and 2 of the present invention has a TVOC of 0.08 mg/m ² ·h or less by using a solvent-free hot melt adhesive resin, so it is very environmentally friendly, and in particular, UV adhesive resin is used. The value is significantly lower than that of Comparative Example 1, confirming that it has a very environmentally friendly effect.

The PVC adhesive films according to Examples 1 and 2 of the present invention have adhesive properties of 1500 g/in or more, and it can be confirmed that they have excellent environmental friendliness and flame retardancy, and exhibit excellent adhesive properties without deterioration of the adhesive properties. In contrast, in the case of Comparative Example 4, the flame retardant content was high, so the flame retardant performance was excellent, but there was a problem of low adhesive properties.

The PVC adhesive film according to Examples 1 to 2 of the present invention has a shrinkage rate of 0.3 mm, which is lower than that of Comparative Examples 1 to 3. In the case of Comparative Example 4, the shrinkage rate is the lowest, but it can be seen that the adhesive properties are greatly reduced due to the inclusion of a large amount of flame retardant.

As described above, the PVC adhesive film and its manufacturing method according to the present invention have been explained through the above preferred embodiments and comparative examples, and their excellence has been confirmed, but those skilled in the art will It will be understood that various modifications and changes can be made to the present invention without departing from the spirit and scope of the present invention.

Claims (20)

It is a PVC adhesive film in which release paper, adhesive layer, and PVC layer are laminated in that order.
The adhesive layer is formed of an adhesive composition containing a hot melt adhesive and a flame retardant,
The hot melt adhesive includes an acrylate copolymer in which acrylate monomers are copolymerized,
The hot melt adhesive has a viscosity of 50 Pa·s or less at 130°C,
The adhesive composition is a solvent-free adhesive composition,
The adhesive composition further includes a photoinitiator,
The flame retardant consists of antimony trioxide (Sb ₂ O ₃ ) and a halogen-based flame retardant,
The flame retardant contains 10 to 50 wt% compared to the adhesive composition,
The antimony trioxide and the halogen-based flame retardant are mixed in a ratio of 1:3 to 1:10,
The adhesive layer is photo-cured by irradiating ultraviolet rays to the adhesive composition,
The PVC adhesive film has a TVOC of 0.2 mg/m ² ·h or less,
The PVC adhesive film is characterized in that the adhesive properties are 1500 g/in or more.
PVC adhesive film.
delete The method of claim 1, wherein the hot melt adhesive has a glass transition temperature of -50°C to -20°C.
PVC adhesive film.
delete The method of claim 1, wherein the acrylate monomer is C1 to C18 alkyl (meth)acrylate.
PVC adhesive film.
The method of claim 5, wherein the acrylate monomer is one selected from the group consisting of methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, and 2-ethylhexyl (meth)acrylate. Characterized by more than
PVC adhesive film.
delete The method of claim 1, wherein the photoinitiator is acetophenone, benzoin, thioxanthone, ancraquinone, acylphosphine oxide, or benzophenone.
PVC adhesive film.
delete delete delete delete delete The method of claim 1, wherein the release paper has a thickness of 100 to 200 ㎛.
PVC adhesive film.
The method of claim 1, wherein the adhesive layer has a thickness of 20 to 60 ㎛.
PVC adhesive film.
The method of claim 1, wherein the thickness of the PVC layer is 100 to 200 ㎛.
PVC adhesive film.
2. The method of claim 1, wherein the PVC layer comprises a flame retardant.
PVC adhesive film.
delete delete (a) heating and melting an adhesive composition containing a hot melt adhesive and a flame retardant;
(b) applying the adhesive composition to the upper surface of the release paper;
(c) forming an adhesive layer by photocuring the adhesive composition by irradiating ultraviolet rays;
(d) laminating a PVC layer on the upper surface of the adhesive layer; a method of manufacturing a PVC adhesive film in which the release paper, the adhesive layer, and the PVC layer are laminated in that order,
The hot melt adhesive includes an acrylate copolymer in which acrylate monomers are copolymerized,
The hot melt adhesive has a viscosity of 50 Pa·s or less at 130°C,
The adhesive composition is a solvent-free adhesive composition,
The adhesive composition further includes a photoinitiator,
The flame retardant consists of antimony trioxide (Sb ₂ O ₃ ) and a halogen-based flame retardant,
The flame retardant contains 10 to 50 wt% compared to the adhesive composition,
The antimony trioxide and the halogen-based flame retardant are mixed in a ratio of 1:3 to 1:10,
The PVC adhesive film has a TVOC of 0.2 mg/m ² ·h or less,
The PVC adhesive film has an adhesive property of 1500 g/in or more.
Manufacturing method of PVC adhesive film.