WO2019146939A1 - Interior film having excellent adhesive strength and flame retardancy, and manufacturing method therefor - Google Patents

Abstract

The present invention relates to an interior film having excellent adhesiveness and flame retardancy, and a manufacturing method therefor. The interior film of the present invention comprises, from an attachment surface, a layered structure of a release paper, an adhesive layer, a flame retardant adhesive layer and a PVC substrate, and thus can exhibit excellent adhesiveness and flame retardancy.

Description

Interior film excellent in adhesion and flame retardancy and method for manufacturing the same

The present invention relates to an interior film excellent in adhesion and flame retardancy and a method for producing the same

Interior film is a finishing material that protects materials and expresses the appearance in various colors and textures. It is widely used as a material for decorating surfaces of interior materials, furniture, and desks.

Up to now, oil-based pressure-sensitive adhesives have generally been used as materials for interior films. However, the oil-based pressure-sensitive adhesive has a problem that the indoor environment is contaminated by the residual solvent. In order to overcome the above-mentioned problems, an aqueous pressure-sensitive adhesive was used as the material of the interior film. However, the water-based pressure-sensitive adhesive had a problem that flame retardancy was greatly reduced. Furthermore, in recent years, in order to prevent the emission of toxic gases, flame resistance is highly demanded for interior / exterior materials for buildings and floor materials, and legal regulations are also strengthened.

Therefore, it is necessary to study the interior film which is not contaminated in the indoor environment, has good adhesion and is flame retarded.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a novel interior film for solving the above problems.

It is another object of the present invention to provide a method for producing the novel interior film.

However, the technical problem to be solved by the present invention is not limited to the above-mentioned problems, and other matters not mentioned can be clearly understood by those skilled in the art from the following description.

According to one embodiment of the present invention, the interior film according to the present invention includes a laminated structure of a release paper, a pressure-sensitive adhesive layer, a flame-retardant adhesive layer and a PVC substrate from an adhering surface.

According to another embodiment of the present invention, there is provided a method for manufacturing an interior film according to the present invention, comprising the steps of: (a) coating an aqueous acrylic emulsion resin on an upper surface of a release paper sheet followed by drying to form a pressure sensitive adhesive layer; Coating a mixture of an aqueous acrylic emulsion resin, a curing agent, an inorganic flame retardant, and an organic flame retardant on the top of the flame-retardant adhesive layer to form a flame-retardant adhesive layer; and (c) forming a PVC substrate on the flame-retardant adhesive layer.

The interior film according to the present invention has an effect of preventing indoor environmental pollution by including an aqueous adhesive. Further, since the interior film according to the present invention includes a pressure-sensitive adhesive layer and a flame-retardant adhesive layer, flame retardancy is secured and at the same time, the adhesive strength is excellent.

The method for producing an interior film according to the present invention has an effect of exerting both adhesive strength and flame retardancy by forming a flame-retardant adhesive layer on the adhesive layer.

1 is a schematic cross-sectional view of an interior film according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which: These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art to which the invention pertains. Only.

<Interior film>

1 is a schematic cross-sectional view of an interior film 100 according to the present invention. Referring to FIG. 1, an interior film 100 according to the present invention includes a laminated structure of a release paper 10, a pressure-sensitive adhesive layer 21, a fire-resistant adhesive layer 22, and a PVC base 30 from an attachment surface.

First, the interior film (100) includes a release paper (10).

The release paper 10 is a base layer for forming a pressure-sensitive adhesive layer 21 to be described later. The release paper 10 may be positioned below the pressure-sensitive adhesive layer 21. The type, formation method, thickness, and the like of the release paper 10 are not particularly limited. For example, the release paper 10 may be a polyethylene (PE) film, a polyethylene terephthalate (PET) film, a polycarbonate (PC) film, or the like.

Next, the interior film (100) includes a pressure-sensitive adhesive layer (21).

The pressure-sensitive adhesive layer (21) may be located on the release paper (10). The pressure-sensitive adhesive layer 21 is responsible for the adhesive performance of the pressure-sensitive adhesive layer 20 shown in FIG.

The pressure-sensitive adhesive layer 21 may contain an aqueous acrylic emulsion resin to prevent indoor environmental pollution and to secure the adhesive property. The aqueous acrylic emulsion resin may include at least one of methyl methacrylate (MMA), butyl acrylate (BA), and hydroxyethyl methacrylate (HEMA). The aqueous acrylic emulsion resin can be used in a state mixed with a solvent. In addition, the aqueous acrylic emulsion resin may be in a colloidal state dispersed in water.

The aqueous acrylic emulsion resin may have a glass transition temperature (Tg) of -60 to 0 占 폚. Preferably, the glass transition temperature (Tg) of the aqueous acrylic emulsion resin may be from -50 to -10 ° C. More preferably, the glass transition temperature (Tg) of the aqueous acrylic emulsion resin may be -40 to -20 ° C. If the glass transition temperature of the aqueous acrylic emulsion resin is less than -60 캜, the heat resistance of the interior film containing the aqueous acrylic emulsion resin may be deteriorated. Further, when the interior film is peeled off from the adherend, there may be a problem that a remnant remains on the surface of the adherend. If the glass transition temperature of the aqueous acrylic emulsion resin is higher than 0 ° C, the adhesion of the interior film may be deteriorated.

Next, the interior film (100) includes a flameproofing layer (22).

The antifogging adhesive layer 22 may be located above the pressure-sensitive adhesive layer 21. The flame-retardant adhesive layer 22 is responsible for the adhesive performance and flame-retardant performance of the adhesive layer 20 shown in Fig.

The flame-retardant adhesive layer 22 may include an inorganic flame retardant, an organic flame retardant, a curing agent, and an aqueous acrylic emulsion resin for securing adhesion and flame retardancy.

The inorganic flame retardant may include at least one of aluminum hydroxide, antimony trioxide, zinc stannate, molybdate, and magnesium hydroxide. The organic flame retardant may be selected from the group consisting of alkyl benzyl acryl monomers substituted with alkyl groups of 1 to 5 carbon atoms, copolymer of dibromostyrene, brominated polystyrene, tetrabromophthalate ester composition, tetra Tetrabromophthalic acid anhydride, tetrabromophthalate diol, tetrabromophthalate ester, tetrabromobenzoate ester, hexabromocyclododecane, tetrabromobisphenol A, tetrabromobisphenol A bis (2, 3-dibromopropyl esters), tetrabromobisphenol A bis (allyl ester), tetrabromobisphenol A phonoxy-terminated carbonate oligomer of tetrabromobisphenol A, decabromodiphenyl ethane, deca Bromodiphenyl oxide, 2,4,6-tribromophenol allyl es Halogenated compounds such as terbium, tribromophenyl allyl ester, bis (tribromophenoxy) ethane, chlorinated paraffin, chlorinated polyolefin, and the like. Since the flame-retardant adhesive layer 22 includes the inorganic flame retardant and the organic flame retardant, the interior film 100 including the flame-retardant adhesive layer 22 has the effect of retarding the ignition at the time of fire and preventing the combustion from spreading.

Preferably, the flame-retardant adhesive layer 22 includes antimony trioxide, which is an inorganic flame retardant, and a halogen-based flame retardant, which is an organic flame retardant. More preferably, the halogen-based flame retardant may include decabromodiphenylethane (DBDPE). The antimony trioxide, which is an inorganic flame retardant, can generate HCl and Hbr and exhibit a radical trap effect. Further, the halogen-based flame retardant combined with the antimony trioxide has a synergistic effect of exerting an oxygen shielding effect and dehydrating carbonization action. In addition, decabromodiphenylethane (DBDPE), which is a halogen-based flame retardant, has an excellent effect on flame retardance against cost.

The inorganic flame retardant and the organic flame retardant may be mostly present in a powder state. The average particle diameter of the inorganic flame retardant may be 1 to 2 占 퐉, and the average particle diameter of the organic flame retardant may be 5 to 10 占 퐉. When the average particle diameter of the inorganic flame retardant is less than 1 占 퐉 and the average particle diameter of the organic flame retardant is less than 5 占 퐉, the inorganic flame retardant and the organic flame retardant may aggregate. When the average particle diameter of the inorganic flame retardant is less than 1 占 퐉 and the average particle diameter of the organic flame retardant is less than 5 占 퐉, the interior film containing the inorganic flame retardant and the organic flame retardant may have a problem that the flame retardancy and the tackiness are uneven . If the average particle diameter of the inorganic flame retardant exceeds 2 탆 and the average particle diameter of the organic flame retardant exceeds 10 탆, it may be difficult to uniformly produce the flame retardant adhesive layer 22. When the average particle diameter of the inorganic flame retardant is more than 2 占 퐉 and the average particle diameter of the organic flame retardant is more than 10 占 퐉, the internal film containing the inorganic flame retardant and the organic flame retardant may be further deteriorated in adhesion.

The flame-retardant adhesive layer 22 may include an inorganic flame retardant and an organic flame retardant, and the weight ratio of the inorganic flame retardant to the organic flame retardant may be 3: 0.8 to 1.2. Preferably, the weight ratio of the inorganic flame retardant to the organic flame retardant is 3: 0.95 to 1.05. The interior film contains the flame-retardant adhesive layer having a weight ratio of the inorganic flame retardant to the organic flame retardant in the range of 3: 0.8 to 1.2, thereby exhibiting thermal stability and flame retardancy due to oxygen shielding effect and dehydration carbonization.

The flame-retardant adhesive layer 22 may include a curing agent, and the curing agent may include at least one of a melamine compound and an oxazoline compound. The interior film containing the curing agent has an effect that the physical properties are not changed.

The flame-resistant adhesive layer 22 may include an aqueous acrylic emulsion resin. The aqueous acrylic emulsion resin may be the same as the aqueous acrylic emulsion resin contained in the pressure sensitive adhesive layer (21). For example, the aqueous acrylic emulsion resin may include at least one of methyl methacrylate (MMA), butyl acrylate (BA), and hydroxyethyl methacrylate (HEMA). The flame-retardant adhesive layer (22) contains the above-mentioned aqueous acrylic emulsion resin, so that the adhesive performance can be secured. The interior film 100 according to the present invention includes the aqueous acrylic emulsion resin in the pressure-sensitive adhesive layer 22 as well as the pressure-sensitive adhesive layer 21, thereby minimizing the deterioration of the adhesion performance of the interior film with time have.

The flame-retardant adhesive layer 22 may include 18 to 30 parts by weight of the inorganic flame retardant, 6 to 10 parts by weight of the organic flame retardant, and 0.01 to 5 parts by weight of the curing agent, based on 100 parts by weight of the aqueous acrylic emulsion resin. Since the flame-retardant adhesive layer includes the aqueous acrylic emulsion resin, the inorganic flame retardant, the organic flame retardant and the curing agent within the above-mentioned range, the interior adhesive film containing the flame-retardant adhesive layer can maintain the initial adhesive property. Also, since the flame-retardant adhesive layer includes the aqueous acrylic emulsion resin, the inorganic flame retardant, the organic flame retardant, and the curing agent within the above-mentioned range, the interior film containing the flame-retardant adhesive layer exhibits excellent flame retardancy. In addition, since the flame-retardant adhesive layer includes the aqueous acrylic emulsion resin, the inorganic flame retardant, the organic flame retardant, and the curing agent within the above-mentioned range, the interior film containing the flame-retardant adhesive layer has the effect of minimizing the deterioration of adhesion force with time.

As described above, the interior film 100 according to the present invention includes the adhesive layer 20. Further, the adhesive layer 20 includes a pressure-sensitive adhesive layer 21, which is responsible for adhesive performance, and a flame-retardant adhesive layer 22, which performs adhesive performance and flame-retardant performance.

The thicknesses of the pressure-sensitive adhesive layer (21) and the flame-retardant adhesive layer (22) may each be 10 to 40 탆. If the thickness of the pressure-sensitive adhesive layer and the flame-retardant pressure-sensitive adhesive layer is less than 10 mu m, adhesion of the interior film containing the pressure-sensitive adhesive layer and the flame-retardant adhesive layer may be deteriorated. When the thickness of the pressure-sensitive adhesive layer and the flame-retardant adhesive layer is more than 40 占 퐉, the interior film containing the pressure-sensitive adhesive layer and the flame-retardant adhesive layer may have a problem of wrinkling on the appearance.

The thickness ratio of the pressure-sensitive adhesive layer (21) and the flame-retardant adhesive layer (22) may be 1: 0.67 to 1.5. Preferably, the thickness ratio of the pressure-sensitive adhesive layer (21) and the flame-retardant adhesive layer (22) may be 1: 0.8 to 1.2. If the thickness of the flameproof layer is less than 0.67 times the thickness of the pressure-sensitive adhesive layer, the interior film containing the pressure-sensitive adhesive layer and the flameproofing layer may have a problem that the adhesive strength after the change with time is significantly lowered due to low initial cohesion . If the thickness of the flameproofing layer is more than 1.5 times the thickness of the pressure-sensitive adhesive layer, the interior film containing the pressure-sensitive adhesive layer and the flameproofing layer may be vulnerable to fire because the flame retardancy is reduced.

Next, the interior film (100) includes a PVC substrate (30).

The PVC base material 30 can strengthen the supporting force of the interior film 100. [ The thickness of the PVC base 30 may be 100 to 300 탆. If the thickness of the PVC base 30 is less than 100 탆, there may be a problem that the volume feeling of the interior film containing the PVC base is lowered. If the thickness of the PVC base 30 is more than 300 탆, the manufacturing cost of the interior film containing the PVC base material may increase.

Next, the interior film 100 may further include a laminated structure of a printing layer and a transparent film layer on the PVC substrate 30.

The print layer may be located on top of the PVC substrate. The type, formation method, thickness, and the like of the print layer are not particularly limited. For example, the print layer may be formed of an acrylobutadiene styrene (ABS) resin, a polycarbonate (PC) resin, a polyvinyl chloride (PVC) resin, a polyurethane (PU) resin, or a polyethylene (PE) resin.

The transparent film layer may be located on top of the print layer. The kind, formation method, thickness, and the like of the transparent film layer are not particularly limited. For example, the transparent film layer Transparent or translucent plastic film may be used. The transparent or translucent plastic film may be a polyvinyl chloride (PVC) film, a polyethylene terephthalate (PET) film, a polyethylene (PE) film, or a polypropylene (PP) film.

As described above, the interior film according to the present invention includes the pressure-sensitive adhesive layer responsible for the adhesive performance, the adhesive property and the flame-retardant adhesive layer responsible for the flame-proofing performance, thereby minimizing deterioration of the adhesive performance with time, Can be expressed.

In the interior film according to the present invention, the peel strength of B in the following formula (1) may be not less than 2100 g / in, and the rate of change of peel strength in the following formula (1) may be not more than 0.3. Preferably, the rate of change of the peel strength in the formula (1) may be 0.1 to 0.26.

&Lt; Formula 1 > Change rate of peel strength = A-B / A

(In the above formula (1), A represents the peel strength of the interior film left at 25 캜 for 20 minutes,

B is the peel strength of the interior film left at 70 캜 for 3 days)

The symbol A in the formula (1) represents the initial peel strength of the interior film. The initial peel strength of the interior film was measured by peeling the interior film with stainless steel (SUS) at an interval of 2.5 cm, placing the interior film at 25 캜 for 20 minutes, pulling the interior film at a rate of 300 mm / min, The peeling strength at the time point of the peeling strength was measured. The initial peel strength of the interior film may be 3000 to 3250 g / in. Preferably, the initial peel strength of the interior film may be 3100 to 3250 g / in. When the initial peel strength of the interior film is less than 3000 g / in, the interior film may have a low initial adhesive strength, which may result in a significant deterioration of the adhesive strength after a lapse of time. If the initial peel strength of the interior film is more than 3250 g / in, the adhesive strength of the interior film is increased, but the problem of low flame resistance may occur.

The symbol B in the formula (1) represents the peeling strength with the passage of time of the interior film. When the interior film was peeled off at a rate of 300 mm / min after being stuck on stainless steel (SUS) at intervals of 2.5 cm, the interior film was allowed to stand at 70 DEG C for 3 days, And the peel strength at the time of starting peeling is measured. The peel strength according to the change with time of the interior film may be 2100 g / in or more. Preferably, the peel strength according to a change with time of the interior film may be 2200 g / in or more. If the peel strength of the interior film is less than 2100 g / in, the adhesive strength of the interior film may be considerably lowered, resulting in a problem of peeling or peeling from the adherend.

The interior film according to the present invention satisfies both the initial adhesive strength of the interior film and the adhesive force after the change with time, by satisfying the following expression (1): peel strength according to change with time of 2100 g / There is an effect that reliability can be enhanced.

Also, the interior film according to the present invention may have a carbonization area of 30 cm ² or less based on the flame retardancy of KOFEIS 1001.

The carbonized area of the interior film is measured by measuring the longest carbonization length among the transverse length and the longitudinal length of the interior film in accordance with the KOFEIS 1001 specification and measuring the carbonization area by a method of obtaining the elliptical width of the measured carbonization length. Specifically, the interior film is attached to a frame measuring 29.5cm x 19.6cm. (Exposed area of the film: 25 cm x 15 cm), then tilt the interior film at a 45 degree angle so that the 4.5 cm long flame is in contact with the PVC substrate surface. The carbonized length is then measured by exposure to a flame for 1 minute. If the carbonization area of the interior film is not more than 30 cm ² according to the fire-proofing performance standard of KOFEIS 1001, the interior film may be deteriorated in flame retardancy and may be vulnerable to fire.

&Lt; Preparation method of interior film >

The method for manufacturing an interior film according to the present invention comprises the steps of: (a) coating an aqueous acrylic-based emulsion resin on an upper surface of a release paper and drying to form a pressure-sensitive adhesive layer; (b) A flame retardant and an organic flame retardant, followed by drying to form a flameproofing layer; and (c) forming a PVC substrate on the flameproofing layer.

First, the manufacturing method according to the present invention includes the steps of (a) coating an aqueous acrylic emulsion resin on an upper side of a release paper and drying to form a pressure-sensitive adhesive layer.

The method for producing the release paper is not particularly limited. For example, a PE layer may be treated on a paper having a thickness of 100um or more and coated thereon with silicon. In addition, when polyurethane PET is used instead of paper having a thickness of 100um or more, it can be manufactured by coating silicon without PE layer treatment.

The pressure-sensitive adhesive layer may be prepared by coating an aqueous acrylic emulsion resin on the release paper and drying the coated paper. The aqueous acrylic emulsion resin may include at least one of methyl methacrylate (MMA), butyl acrylate (BA), and hydroxyethyl methacrylate (HEMA). Specifically, the aqueous acrylic emulsion resin may be coated on the top of the release paper to a thickness of 20 to 30 탆. Thereafter, the coated aqueous acrylic emulsion resin is dried at 120 ° C or higher for 3 minutes until it becomes transparent to form a pressure-sensitive adhesive layer.

In the method of manufacturing an interior film according to the present invention, the interior film produced according to the above-described manufacturing method is excellent in initial adhesive force and minimizes the deterioration of the adhesive force after a lapse of time because the pressure sensitive adhesive layer is formed.

Next, the manufacturing method according to the present invention includes the step of (b) coating a mixture of an aqueous acrylic emulsion resin, a curing agent, an inorganic flame retardant, and an organic flame retardant on the pressure sensitive adhesive layer, followed by drying to form a flameproof adhesive layer.

Specifically, the step of forming the flame-retardant adhesive layer comprises the steps of: preparing 18 to 30 parts by weight of an inorganic flame retardant, 6 to 10 parts by weight of an organic flame retardant, and 0.01 to 5 parts by weight of a curing agent relative to 100 parts by weight of an aqueous acrylic emulsion resin; Coating the mixture on the top of the layer to a thickness of 20 to 30 탆 and then drying. The step of drying the mixture may be performed by drying the coated mixture at about 80 ° C for 1 minute and 30 seconds, followed by drying at about 110 ° C for 1 minute and 30 seconds. By the drying step, a flame-retardant adhesive layer can be formed on the pressure-sensitive adhesive layer.

In the method for producing an interior film according to the present invention, the process for forming the flame-retardant adhesive layer is carried out, so that the interior film produced according to the above-described method has an effect of exhibiting excellent flame retardancy without deteriorating the adhesive strength.

Next, the manufacturing method according to the present invention includes (c) forming a PVC base material on the flame-retardant adhesive layer.

The method of forming the PVC substrate is not particularly limited. For example, PVC resin can be coated on the flame-retardant adhesive layer to a thickness of 100 μm or more using a calender method to form a PVC substrate.

In the method of manufacturing an interior film according to the present invention, a process of forming a PVC substrate is performed, so that the interior film manufactured according to the manufacturing method has an effect of enhancing the supporting force.

Next, the manufacturing method according to the present invention may further include the steps of (d) forming a print layer on the PVC substrate, and (e) forming a transparent film layer on the print layer.

 The kind of the printing layer, the forming method, the thickness, and the like are not particularly limited. For example, the print layer may be made of an acrylobutadiene styrene (ABS) resin, a polycarbonate (PC) resin, a polyvinyl chloride (PVC) resin, a polyurethane (PU) resin, a polyethylene (PE) The kind of the transparent film layer, the method of forming it, the thickness, and the like are also not particularly limited. For example, the transparent film layer may be made of a polyvinyl chloride (PVC) film, a polyethylene terephthalate (PET) film, a polyethylene (PE) film, a polypropylene (PP)

The method of manufacturing an interior film according to the present invention is characterized in that a process of forming a printing layer on an upper part of a PVC substrate and a process of forming a transparent film layer on the printing layer are performed, There is an effect that various patterns can be displayed.

Hereinafter, preferred embodiments of the present invention will be described in order to facilitate understanding of the present invention. However, the following examples are provided only for the purpose of easier understanding of the present invention, and the present invention is not limited by the following examples.

<Examples>

Example 1

The aqueous acrylic emulsion resin obtained by adding methyl methacrylate, butyl acrylate and AIBN as an initiator to the upper side of the releasing treated paper and reacting at 70 DEG C for 12 hours was coated to a thickness of 20 mu m and the aqueous acrylic emulsion The resin is dried to form a pressure-sensitive adhesive layer. 100 parts by weight of an aqueous acrylic emulsion resin, 7.4 parts by weight of DBDPE particles, 22.6 parts by weight of antimony trioxide and 0.25 parts by weight of a melamine compound curing agent are mixed to prepare a mixture. Then, the mixture was coated on the pressure sensitive adhesive layer to a thickness of 30 탆 and dried at 80 캜 for 1 minute and 30 seconds. Thereafter, it is dried again at 110 DEG C for 1 minute and 30 seconds to form a flame-retardant adhesive layer. Thereafter, a 100 μm thick PVC substrate made of a polyvinyl chloride (PVC) resin was formed, and the fire-proofing adhesive layer and the PVC substrate were joined together to prepare an interior film.

Example 2

An interior film was prepared by carrying out the same processes as in Example 1, except that aluminum hydroxide particles were used in place of the antimony trioxide particles of Example 1.

Example 3

An interior film was produced by following the same procedure as in Example 1, except that zirconium zinc particles were used instead of the antimony trioxide particles of Example 1.

Example 4

100 parts by weight of an aqueous acrylic emulsion resin obtained by adding methyl methacrylate, butyl acrylate and AIBN as an initiator to the pressure sensitive adhesive layer of Example 1 at 70 캜 for 12 hours, 12 parts by weight of antimony trioxide, 15 parts by weight of the particles and 0.25 parts by weight of the melamine compound curing agent were mixed to prepare a mixture.

Example 5

The procedure of Example 1 was repeated except that chlorinated paraffin particles were used in place of the DBDPE particles of Example 1 to prepare an interior film.

Example 6

100 parts by weight of an aqueous acrylic emulsion resin obtained by adding methyl methacrylate, butyl acrylate and AIBN as an initiator to the pressure sensitive adhesive layer of Example 1 at 70 캜 for 12 hours, 9 parts by weight of DBDPE particles, 27 parts by weight of antimony trioxide And 0.25 parts by weight of a melamine compound curing agent were mixed to prepare a mixture. The same procedure as in Example 1 was repeated to prepare an interior film.

Example 7

100 parts by weight of an aqueous acrylic emulsion resin obtained by adding methyl methacrylate, butyl acrylate and AIBN as an initiator to the pressure sensitive adhesive layer of Example 1 at 70 캜 for 12 hours, 7.4 parts by weight of DBDPE particles, 22.6 parts by weight of antimony trioxide And 3 parts by weight of a melamine compound curing agent were mixed to prepare a mixture, and the same processes as in Example 1 were carried out to prepare an interior film.

Example 8

An aqueous acrylic emulsion resin obtained by adding methyl methacrylate, butyl acrylate and AIBN as an initiator to the upper side of the release paper of Example 1 at 70 ° C for 12 hours was coated to a thickness of 30 μm, 1 was coated in a thickness of 20 mu m to prepare an interior film.

Example 9

100 parts by weight of an aqueous acrylic emulsion resin obtained by adding methyl methacrylate, butyl acrylate and AIBN as an initiator to the pressure sensitive adhesive layer of Example 1 at 70 캜 for 12 hours, 8 parts by weight of DBDPE particles, 24 parts by weight of antimony trioxide And 2 parts by weight of a melamine compound curing agent were mixed to prepare a mixture, and the same processes as in Example 1 were carried out to prepare an interior film.

Example 10

An aqueous acrylic emulsion resin obtained by adding methyl methacrylate, butyl acrylate and AIBN as an initiator to the upper side of the release paper of Example 1 at 70 ° C for 12 hours was coated to a thickness of 25 μm, 1 was coated in a thickness of 25 mu m to prepare an interior film.

Comparative Example 1

Aqueous acrylic emulsion resin obtained by adding hydroxyethyl methacrylate, butyl acrylate and AIBN as an initiator to the upper side of the releasing treated paper and reacting at 70 캜 for 12 hours was coated to a thickness of 50 탆 and dried at 120 캜 or higher for 3 minutes To form a pressure-sensitive adhesive layer. Thereafter, a 100 μm thick PVC substrate made of a polyvinyl chloride (PVC) resin was formed, and the pressure-sensitive adhesive layer and the PVC substrate were laminated together to prepare an interior film.

Comparative Example 2

100 parts by weight of an aqueous acrylic emulsion resin obtained by adding hydroxyethyl methacrylate, butyl acrylate and AIBN as an initiator to the top of release-treated release paper and reacting at 70 DEG C for 12 hours, 7.4 parts by weight of DBDPE particles, 22.6 parts by weight of antimony trioxide And 0.25 parts by weight of a melamine compound curing agent were mixed to prepare a mixture. Then, the mixture was coated on the top of the release paper to a thickness of 50 탆 and dried at 80 캜 for 1 minute and 30 seconds. Thereafter, it is dried again at 110 DEG C for 1 minute and 30 seconds to form a flame-retardant adhesive layer. Thereafter, a 100 μm thick PVC substrate made of a polyvinyl chloride (PVC) resin was formed, and the fire-proofing adhesive layer and the PVC substrate were joined together to prepare an interior film.

<Evaluation>

Experimental Example 1: Measurement of peel strength and evaluation of peel strength

The interior films of Examples 1 to 10 and Comparative Examples 1 and 2 were stuck to stainless steel (SUS) at intervals of 2.5 cm and the laminated film was allowed to stand for 20 minutes and then pulled at a speed of 300 mm / min to measure its strength. Further, the interlayer film was peeled off from the stainless steel (SUS) at intervals of 2.5 cm and allowed to stand at 70 DEG C for 3 days, and the strength thereof was measured while being pulled at a speed of 300 mm / min. When the peel strength of the interior film left at 25 캜 for 20 minutes is not less than 3100 g / in and the peel strength of the interior film left at 70 캜 for 3 days is not less than 2300 g / in, the peeling strength of the interior film is excellent. When the peel strength of the interior film left at 25 占 폚 for 20 minutes is less than 3000 g / in and less than 3100 g / in and the peel strength of the interior film left at 70 占 폚 for 3 days is less than 2100 g / in and less than 2300 g / The peeling force of the film is good. The peeling force of the interior film which does not satisfy the above range is unsuitable.

Experimental Example 2: Creep measurement

The interior films of Examples 1 to 10 and Comparative Examples 1 and 2 were cut into a 2.5 cm x 8 cm piece of stainless steel (SUS) with a length of 5 cm, and left at 25 캜 for 30 minutes. After that, weights of 500g were placed at 90 degrees against the attached surface and left at 25 ° C for 20 minutes to measure the length of the removed surface. The interior film was cut into a 2.5 cm x 8 cm piece of stainless steel (SUS) with a length of 5 cm, and left at 70 DEG C for 3 days. Thereafter, the weights were set at 90 degrees and left at 25 DEG C for 20 minutes to measure the time when the front surface of the cut inner film was dropped or the length at which the front surface was removed.

Experimental Example 3: Carbonization area measurement and flame resistance evaluation

The interior films of Examples 1 to 10 and Comparative Examples 1 and 2 were stuck to a frame measuring 29.5 cm x 19.6 cm. (Exposed area of the film: 25 cm x 15 cm), the interior film is inclined at a 45 degree inclination, and a flame of 4.5 cm in length is brought into contact with the PVC substrate surface. Then, the carbonized length is measured by exposing to a flame for 1 minute to obtain a carbonized area. The carbonized area is measured by measuring the longest carbonization length among the transverse length and the longitudinal length of the interior film on the basis of the fire resistance performance standard of KOFEIS 1001 and measuring the carbonization area by a method of obtaining the elliptical width. If the carbonization area is 30 m ² or less, the flame retardancy of the interior film is good. If the carbonization area exceeds 30 m ² or if it is completely burned, the flame retardancy of the interior film is inappropriate.

The rate of change in peel strength, peel strength, peel strength, creep, carburized area, peel strength and flame resistance evaluation results of the interior films of Examples 1 to 10 and Comparative Examples 1 and 2 are shown in Table 1 below.

	Treatment condition	Rate of change of peel strength	Peel strength (g / in)	Creep (dropout length or total dropout time)	Carbonization area (cm 2 )	Peel strength evaluation	Evaluation of Flame Retardancy
Example 1	Leave at 25 ° C for 20 minutes	0.26	3120	3.7mm	20.9	Great	Good
	Leave at 70 ℃ for 3 days		2320	12 minutes 10 seconds
Example 2	Leave at 25 ° C for 20 minutes	0.25	3115	4.0mm	22	Great	Good
	Leave at 70 ℃ for 3 days		2320	11 minutes 50 seconds
Example 3	Leave at 25 ° C for 20 minutes	0.25	3115	3.8mm	22.1	Great	Good
	Leave at 70 ℃ for 3 days		2319	11 minutes 55 seconds
Example 4	Leave at 25 ° C for 20 minutes	0.25	3116	4.2mm	24.2	Great	Good
	Leave at 70 ℃ for 3 days		2320	10 minutes 55 seconds
Example 5	Leave at 25 ° C for 20 minutes	0.25	3112	8.2mm	29.3	Great	Good
	Leave at 70 ℃ for 3 days		2317	9 minutes 55 seconds
Example 6	Leave at 25 ° C for 20 minutes	0.26	3113	3.9 mm	20.9	Great	Good
	Leave at 70 ℃ for 3 days		2319	12 minutes 05 seconds
Example 7	Leave at 25 ° C for 20 minutes	0.25	3112	3.9 mm	21.1	Great	Good
	Leave at 70 ℃ for 3 days		2319	12 minutes 03 seconds
Example 8	Leave at 25 ° C for 20 minutes	0.26	3120	4.0mm	21.2	Great	Good
	Leave at 70 ℃ for 3 days		2320	11 minutes 50 seconds
Example 9	Leave at 25 ° C for 20 minutes	0.25	3111	4.0mm	21	Great	Good
	Leave at 70 ℃ for 3 days		2318	12 minutes 01 seconds
Example 10	Leave at 25 ° C for 20 minutes	0.26	3119	4.1mm	21.1	Great	Good
	Leave at 70 ℃ for 3 days		2319	11 minutes 48 seconds
Comparative Example 1	Leave at 25 ° C for 20 minutes	0.26	3240	2mm	Front burning	Great	incongruity
	Leave at 70 ℃ for 3 days		2410	5mm
Comparative Example 2	Leave at 25 ° C for 20 minutes	0.50	3050	35mm	17.8	incongruity	Good
	Leave at 70 ℃ for 3 days		1520	3 minutes 05 seconds
	Leave at 70 ° C for 20 minutes		1920	8 minutes 31 seconds

As shown in Table 1, the interior films of Examples 1 to 10 had a smaller rate of change in peel strength than the interior film of Comparative Example 2, and the peel strength was excellent.

Also, as shown in Table 1, the interior films of Examples 1 to 10 had smaller carbonization areas of the interior film than those of the interior film of Comparative Example 1, and it was confirmed that the interior films had excellent flame retardancy.

Thus, it was confirmed that the interior films of Examples 1 to 10 exhibited excellent adhesive force equal to or higher than that of the interior films of Comparative Examples 1 and 2 and excellent flame retardancy by minimizing the difference between the initial peel strength and the peel strength after aging.

Claims (18)

1. A release layer, a pressure-sensitive adhesive layer, and a PVC-based laminate structure

   Interior film.
2. The method according to claim 1,

   Characterized in that the pressure-sensitive adhesive layer comprises an aqueous acrylic emulsion resin

   Interior film.
3. The method according to claim 1,

   Wherein the flame-retardant adhesive layer comprises an inorganic flame retardant, an organic flame retardant, a curing agent, and an aqueous acrylic emulsion resin

   Interior film.
4. The method of claim 3,

   The inorganic flame retardant includes at least one of aluminum hydroxide, antimony trioxide, zinc stannate, molybdate, and magnesium hydroxide.

   Interior film.
5. The method of claim 3,

   Wherein the organic flame retardant comprises a halogen-based flame retardant

   Interior film.
6. The method of claim 3,

   Wherein the inorganic flame retardant comprises antimony trioxide,

   Wherein the organic flame retardant comprises a halogen-based flame retardant

   Interior film.
7. The method according to claim 6,

   Characterized in that said halogen-based flame retardant comprises decabromodiphenylethane (DBDPE)

   Interior film.
8. The method of claim 3,

   And the weight ratio of the inorganic flame retardant to the organic flame retardant is 3: 0.8 to 1.2

   Interior film.
9. The method of claim 3,

   Wherein the curing agent comprises at least one of a melamine compound and an oxazoline compound

   Interior film.
10. The method according to claim 2 or 3,

    Wherein the aqueous acrylic emulsion resin comprises at least one of methyl methacrylate (MMA), butyl acrylate (BA), and hydroxyethyl methacrylate (HEMA)

    Interior film.
11. The method of claim 3,

    Wherein the flame-retardant adhesive layer comprises 18 to 30 parts by weight of the inorganic flame retardant, 6 to 10 parts by weight of the organic flame retardant, and 0.01 to 5 parts by weight of the curing agent, based on 100 parts by weight of the aqueous acrylic emulsion resin

     Interior film.
12. The method according to claim 1,

    And the thickness of the pressure-sensitive adhesive layer and the flame-retardant adhesive layer are respectively 10 to 40 μm

     Interior film.
13. The method according to claim 1,

    Wherein the thickness ratio of the pressure-sensitive adhesive layer and the flame-resistant adhesive layer is 1: 0.67 to 1.5

     Interior film.
14. The method according to claim 1,

    Further comprising a layered structure of a printing layer and a transparent film layer on the PVC substrate

    Interior film.
15. The method according to claim 1,

    The peel strength of B in the following formula (1) is 2100 g / in or more,

    Wherein a rate of change of the peel strength in the following formula (1) is 0.3 or less

    Interior film.

    &Lt; Formula 1 > Change rate of peel strength = A-B / A

    (In the above formula (1), A represents the peel strength of the interior film left at 25 캜 for 20 minutes,

    B is the peel strength of the interior film left at 70 캜 for 3 days)
16. The method according to claim 1,

    Characterized in that the carbonization area based on the flame retardancy of KOFEIS 1001 is 30 cm ² or less

    Interior film.
17. (a) coating an aqueous acrylic-based emulsion resin on an upper surface of a release paper and drying to form a pressure-sensitive adhesive layer;

    (b) coating a mixture of an aqueous acrylic emulsion resin, a curing agent, an inorganic flame retardant, and an organic flame retardant on the pressure sensitive adhesive layer, and then drying the resultant to form a flameproof adhesive layer; And

    (c) forming a PVC base material on the flame-retardant adhesive layer

    A method of manufacturing an interior film.
18. 18. The method of claim 17,

    After the step (c)

    (d) forming a print layer on top of the PVC substrate; And

    (e) forming a transparent film layer on the print layer.

    A method of manufacturing an interior film.

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