KR102562482B1 - Flame-retardant interior film - Google Patents

Abstract

The present invention has a structure in which an adhesive layer and a PVC base layer are sequentially laminated, wherein the PVC base layer includes at least one selected from the group consisting of antimony oxide, a silicic acid-based flame retardant, and a metal hydroxide-based flame retardant, and the adhesive layer is acrylic-based. It relates to a flame retardant interior film comprising a resin and antimony oxide.

Description

Flame retardant interior film {FLAME-RETARDANT INTERIOR FILM}

The present invention relates to a flame retardant interior film in which an adhesive layer and a base layer are sequentially laminated, and relates to a flame retardant interior film having excellent adhesion and flame retardancy while including a transparent adhesive layer.

Interior sheets are used for various purposes, such as decoration, signboards, and indoor/outdoor decoration. Since it can be produced in various ways regardless of design, anyone can easily implement various designs and the exterior appearance can be greatly improved at low cost, so the application area of interior film continues to increase.

The interior film is manufactured by laminating a plurality of layers such as an adhesive layer and a substrate layer, and polymer materials are preferred in terms of cost and processability. In particular, since PVC material, which is widely used as an interior film material, has a fast flame propagation speed and generates toxic gas while burning, it is necessary to improve flame retardancy in order to use it for interior decoration.

On the other hand, since the interior film is used to improve the appearance by being attached to the surface to be attached indoors and outdoors, it is always exposed to external factors such as humidity, temperature, and light. The PVC base layer and the adhesive layer have different expansion rates and strain rates, and contraction and expansion are repeated over time. In particular, since the PVC base layer is manufactured as an interior film in a stretched state in the manufacturing process, the shrinkage rate is higher than that of the adhesive layer, and accordingly, after the interior film is installed, the PVC base layer shrinks, resulting in a relatively low shrinkage rate. The adhesive layer is exposed to the outside.

In the case of a flame retardant interior film, as a flame retardant is added not only to the base layer but also to the adhesive layer in order to enhance flame retardancy, the adhesive layer has a color such as white, and as described above, shrinkage of the base layer after construction of the interior film As a result, when the colored adhesive layer is exposed, there is a problem in that the appearance of the construction part is greatly damaged.

In particular, the above problems are caused by the butt construction method, which is a method of constructing the ends of the interior film butt together so that the ends of the interior film do not overlap each other, rather than the overlapping construction method, which is a method of constructing the ends of the interior film so that they overlap each other. There are problems that can hurt you.

In this regard, Korean Patent Publication No. 10-2019-0070018 discloses a flame retardant interior sheet including a foam layer obtained by adding a flame retardant to a PVC foam layer. However, the interior sheet to which flame retardancy is imparted by adding a flame retardant is only disclosed, and the problem of deterioration in appearance due to exposure of the colored flame retardant adhesive layer due to shrinkage of the substrate layer after construction of the interior film is not recognized at all.

Japanese Patent Registration No. 6526725 relates to a pressure-sensitive adhesive composition for decorative sheets, including a (meth)acrylic acid ester copolymer and a flame retardant, but only disclosing that various known flame retardants may be included, and is transparent with excellent flame retardancy and adhesiveness. The specific flame retardant component of the adhesive layer and the addition amount and composition ratio of each component are not disclosed at all.

Japanese Patent Registration No. 5271770 discloses a non-flammable cosmetic sheet having an adhesive layer containing a polyvinyl chloride-based thermoplastic resin sheet, an acrylic acid ester copolymer, a brominated flame retardant, antimony trioxide, and a tackifier. Necessity and specific configuration of the flame retardant interior film having a transparent adhesive layer having excellent adhesiveness are not disclosed.

Therefore, while improving the flame retardancy of the interior film, it is necessary to develop a flame retardant interior film having excellent adhesiveness and having a transparent adhesive layer so that the appearance is not damaged even after butt construction.

Republic of Korea Patent Publication No. 10-2019-0070018 Japanese Patent Registration No. 6526725 Japanese Patent Registration No. 5271770

In the conventional flame retardant interior film, when the adhesive layer is exposed to the outside due to shrinkage of the substrate layer, the colored adhesive layer is exposed and there is a problem of deteriorating the appearance of the construction site. The present invention is to solve the above problem. for the purpose of

An object of the present invention is to provide a flame retardant interior film having good flame retardancy while introducing a transparent adhesive layer into the interior film.

The flame retardant interior film according to the present invention for solving the above problems has a structure in which an adhesive layer and a PVC base layer are sequentially stacked, and the PVC base layer is composed of antimony oxide, a silicic acid-based flame retardant, and a metal hydroxide-based flame retardant. It includes at least one selected from the group, and the adhesive layer includes an acrylic resin and antimony oxide.

In the present invention, the PVC base layer includes antimony oxide, the silicic acid-based flame retardant, and the metal hydroxide-based flame retardant, and the antimony oxide, the silicic acid-based flame retardant, and the metal hydroxide-based flame retardant are included in the PVC base layer. It may be included in 10 to 50 parts by weight based on 100 parts by weight of vinyl chloride.

In the present invention, the PVC base layer includes antimony oxide, the silicic acid-based flame retardant, and the metal hydroxide-based flame retardant, and the antimony oxide, the metal hydroxide-based flame retardant, and the silicic acid-based flame retardant are 1: 1 to 5: 0.2 to It can be added in a weight ratio of 3.

In the present invention, the antimony oxide and the silicic acid-based flame retardant are each independently included in an amount of 1 to 12.5 parts by weight based on 100 parts by weight of polyvinyl chloride, and the metal hydroxide-based flame retardant is included in an amount of 1 to 25 parts by weight based on 100 parts by weight of polyvinyl chloride. It may be included in parts by weight.

In the present invention, the adhesive layer may include 1 to 10 parts by weight of antimony oxide based on 100 parts by weight of the acrylic resin.

In the present invention, the adhesive layer may further include a bromine-based flame retardant, and the adhesive layer may include 10 to 30 parts by weight of the bromine-based flame retardant based on 100 parts by weight of the acrylic resin.

In the present invention, the flame retardant interior film may have a peel force of 1.80 kg/in or more measured based on ASTM D3330.

In the present invention, the flame-retardant interior film may have a Total Heat Release (THR) value of 8.0 MJ/m ² or less as measured by a cone calorimeter measurement method in accordance with ISO 5660-1 regulations.

In the present invention, the tensile strength of the flame retardant interior film may be 15 to 30 MPa.

The flame retardant interior film according to the present invention has the advantage of not deteriorating the appearance of the construction site because the adhesive layer has transparency even when the adhesive layer is exposed due to shrinkage of the substrate layer when the interior film is butt-constructed.

The present invention has an effect of good flame retardancy while preventing deterioration of the appearance occurring over time after the construction of the interior film.

The flame retardant interior film according to the present invention has excellent adhesion of the adhesive layer and excellent flame retardancy.

1 is a schematic vertical cross-sectional view of a flame retardant interior film according to an embodiment of the present invention;
Figure 2 is a vertical cross-sectional schematic diagram showing a deformed state according to shrinkage of the substrate layer of a conventional flame retardant interior film;
3 is a schematic plan view showing a state in which a conventional flame retardant interior film is deformed according to shrinkage of a substrate layer after butt construction.

Hereinafter, each configuration of the present invention will be described in more detail so that those skilled in the art can easily practice it, but this is only one example, and the scope of the present invention is Not limited.

In order to impart flame retardancy to the interior film, a flame retardant is added to each constituent layer constituting the interior film.

The interior film is used for the purpose of imparting an aesthetic sense by attaching the interior film to a position to be attached by printing a desired design on the top of the base layer and providing an adhesive layer below the base layer.

As a method of constructing the interior film, overlapping construction, which is a method of constructing by overlapping the outer peripheries of a plurality of interior films, and butt construction in which the outer peripheries of the interior films do not overlap each other and the ends of the interior films are in contact with each other There are construction methods.

The flame-retardant adhesive layer constituting the flame retardant interior film is not transparent and has a color such as white. Each component layer of the film shrinks at a different shrinkage rate, so that only the adhesive layer is exposed to the outside, which spoils the appearance.

Specifically, referring to FIG. 2, which is a schematic vertical cross-sectional view and FIG. 3, which is a plan view schematic diagram showing the deformation of the base layer of a conventional flame retardant interior film according to shrinkage, the PVC base layer is an adhesive layer in a state in which it is stretched through a calendering process. It is laminated with and manufactured as an interior film.

The PVC base layer 21 is laminated with the adhesive layer 11 in a stretched state through a calendering process to make a flame retardant interior film 101, and then applied to the surface 1 to be adhered. As time elapses after construction, the stretched PVC base layer 21 contracts and transforms into a contracted PVC base layer 21'.

As the adhesive layer 11, which has relatively low shrinkage and is supported in a state of being adhered to the surface to be adhered 1, is maintained without significant shrinkage in its original shape, the adhesive layer under the shrinked PVC base layer 21' (11) is exposed to the outside.

Since the adhesive layer 11 constituting the flame retardant interior film 101 is colored as it contains a flame retardant, after construction of the flame retardant interior film 101, as the PVC base layer 21 shrinks, the colored adhesive layer (11) is observed, resulting in a problem of deterioration in aesthetics.

The present invention is to solve the above-described problems, even if the adhesive layer is exposed due to deformation such as shrinkage of the base layer after butt construction, the adhesive layer is transparent and does not impair the aesthetics of the interior film, and at the same time, the flame retardant interior As a film, a flame retardant interior film having excellent adhesion of an adhesive layer and excellent flame retardancy of the interior film itself is provided.

Hereinafter, each configuration of the flame retardant interior film according to the present invention will be described in more detail, but this is only one embodiment for understanding the technical idea of the present invention, and the scope of the present invention is not limited by the following description. No.

PVC base layer

The PVC base layer containing polyvinyl chloride is manufactured in the form of a film in a stretched state through a calendering process during processing, and as it is laminated with the adhesive layer in the stretched state, the base layer naturally shrinks over time. occurs. When the stretched polyvinyl chloride substrate layer shrinks, there may be a problem in that the adhesive layer in a state of being adhered to the surface to be adhered is exposed.

When the interior film including the polyvinyl chloride base layer and the adhesive layer stretched as described above is constructed by the butt construction method, at the time of construction, the ends of the stretched base layer are aligned and attached so that they come into contact with each other, but as time passes Or, according to environmental changes (temperature, humidity, etc.) around the construction part, the stretched substrate layer shrinks and the lower adhesive layer is exposed to the outside.

As the flame retardant adhesive layer of the flame retardant interior film has a color, due to shrinkage of the substrate layer, the colored flame retardant adhesive layer is exposed, resulting in a significant deterioration in appearance.

This is due to the fact that the flame retardant adhesive layer becomes opaque as the flame retardant is added in an excessive amount to secure a desired level of flame retardancy.

The present invention is to solve this problem, as described above, by introducing an adhesive layer having the above composition, by introducing a transparent adhesive layer having excellent adhesiveness and good flame retardancy, appearance damage occurring during butt construction of interior films It aims to solve problems.

Specifically, in the present invention, the PVC base layer includes polyvinyl chloride and a flame retardant. It includes polyvinyl chloride to be made of a material having a shape of a base layer and a predetermined strength, and includes at least one selected from the group consisting of antimony oxide, a silica acid-based flame retardant, and a metal hydroxide-based flame retardant to impart flame retardancy.

The PVC base layer is prepared in a layered form using a PVC base layer forming composition. For example, a substrate layer may be formed by applying a substrate layer forming composition including polyvinyl chloride, an organic flame retardant, an inorganic flame retardant, an auxiliary flame retardant, a plasticizer, a heat-resistant plasticizer, a stabilizer, a processing aid, an impact modifier, and the like.

The base layer may have a thickness of 50 to 150 μm (micrometer), preferably, 80 to 150 μm (micrometer).

When the thickness is less than the above thickness, the strength of the flame retardant interior film is lowered, making it unsuitable for use as an interior film, and when it is thicker than the above thickness, it is difficult to apply to curved areas.

The PVC base layer includes antimony oxide, a silicic acid-based flame retardant, and a metal hydroxide-based flame retardant, and 10 to 50 parts by weight of the antimony oxide, the silicic acid-based flame retardant, and the metal hydroxide-based flame retardant based on 100 parts by weight of polyvinyl chloride. it could be

When added in excess of the above content, the viscosity of the composition for forming the base layer increases, making it difficult to process the composition into a layer form, and also, the transparency of the adhesive layer deteriorates, so that the adhesive layer is formed on the outside. When exposed, there is a problem of having the existing problem of damaging the appearance as it is.

While satisfying the total content range of the above-described flame retardants, each flame retardant is added to satisfy the above content ratio.

More specifically, the antimony oxide, the metal hydroxide-based flame retardant, and the silicate-based flame retardant may be added in a weight ratio of 1: 1 to 5: 0.2 to 3.

Preferably, it may be added in a weight ratio of 1: 1 to 4.5: 0.4 to 1.2.

When the content of the silicic acid-based flame retardant is added in excess of the above ratio, the manufacturing cost increases, the strength of the film decreases, and workability deteriorates. There is a problem of poor flame retardancy.

On the other hand, when the metal hydroxide-based flame retardant is added in excess of the above ratio, the viscosity of the composition for forming a PVC base layer increases, making it difficult to form a film, and when making an interior film, the base layer according to temperature change As the shrinkage rate increases, the quality of the interior film may deteriorate. When the content of the metal hydroxide-based flame retardant is added in a smaller amount than the above ratio, there may be a problem in that flame retardant performance is lowered.

Meanwhile, the antimony oxide may be specifically, antimony trioxide (Sb ₂ O ₃ ), antimony pentoxide (Sb ₂ O ₅ ), or the like, and preferably, may be antimony trioxide.

Antimony trioxide is a white odorless powder that is mainly used as a flame retardant for plastics, etc., and is used as a catalyst for polyester polymerization and as a clearing agent for removing air bubbles in the glass manufacturing process. Antimony trioxide for the flame retardant may be added in an appropriate ratio to a halogen-based flame retardant or the like depending on the type of plastic to increase the flame retardant effect.

Specifically, the antimony oxide plays a role of helping the chlorine radicals formed in the PVC base layer to capture OH and H radicals to prevent combustion. In the case of using a PVC resin as in the present invention, antimony oxide catches halogen radicals to prevent flame retardant performance from deteriorating because chlorine radicals generated as the PVC base layer burns easily fly into the air to maintain flame retardant performance. It serves to reinforce and has the effect of improving the flame retardancy of the PVC base layer.

In the present invention, the antimony oxide may be included in an amount of 1 to 12.5 parts by weight based on 100 parts by weight of the polyvinyl chloride.

The silicic acid-based flame retardant is a silicate compound, and may include, for example, a silicate compound such as sodium silicate, calcium silicate, or magnesium silicate.

The silicic acid-based flame retardant serves to prevent combustion by forming a glass film on the carbonized film formed during combustion, thereby preventing active radicals that cause combustion from contacting decomposed materials by making the carbonized film strong. In the present invention, the silicic acid-based flame retardant may be included in an amount of 1 to 12.5 parts by weight based on 100 parts by weight of the polyvinyl chloride.

Meanwhile, the metal hydroxide-based flame retardant refers to a metal hydroxide salt, and for example, a flame retardant such as magnesium hydroxide, aluminum hydroxide, or calcium hydroxide may be used.

The metal hydroxide-based flame retardant generates water during combustion to lower the temperature of a combustion site to prevent combustion and thereby improve flame retardant performance. In the present invention, the metal hydroxide-based flame retardant may be included in 1 to 25 parts by weight based on 100 parts by weight of the polyvinyl chloride.

However, within the range that satisfies the total content and addition ratio of the flame retardant included in the PVC base layer, the addition amount for each type of flame retardant is only one example, and the actual addition amount within the range that satisfies the total content and addition ratio is the above It may be appropriately added within a range of ratios.

The present invention provides a flame retardant interior film in which flame retardant performance of a PVC base layer is maximized by adding the above-described flame retardant at the same time to satisfy a predetermined content and ratio.

The PVC base layer may further include other components such as plasticizers and heat stabilizers in addition to flame retardants.

In the case of other components, it may be added in an appropriate amount as needed.

Specifically, the plasticizer may be, for example, a phthalate-based plasticizer, an adipate-based plasticizer, a trimellitates-based plasticizer, an ester-based plasticizer, or the like.

In case of thermal stabilizer, Cd/Ba/Zn thermal stabilizer, Cd/Ba thermal stabilizer, Ba/Zn thermal stabilizer, Ca/Zn thermal stabilizer, Na/Za thermal stabilizer, Sn thermal stabilizer, Pb thermal stabilizer Stabilizers, Cd-based thermal stabilizers and Zn-based thermal stabilizers can be used, and MBS impact modifiers and Acrylic impact modifiers can be used as impact modifiers. Each component does not necessarily have to use one component, and one or more appropriate components may be used as needed.

However, since the above components are not essential components, other additional components may be added as needed within a range not departing from the object of the present invention, or the base layer may be formed without the above components.

polyvinyl chloride

The polyvinyl chloride is one of the thermoplastics, and has excellent processability and durability, but has poor heat resistance. In the present invention, by forming a base layer by adding a flame retardant in addition to the polyvinyl chloride, the weakness of polyvinyl chloride against heat is compensated for.

Meanwhile, the polyvinyl chloride is an additive polymer polymerized using vinyl chloride as a monomer, and in the present invention, it is preferable to use polyvinyl chloride having a degree of polymerization in the range of 500 to 2000. More preferably, polyvinyl chloride having a polymerization degree of 800 to 1200 can be used.

In the case of using polyvinyl chloride having a degree of polymerization higher than the degree of polymerization, processing is difficult and too hard, and in the case of using polyvinyl chloride having a degree of polymerization lower than the degree of polymerization, durability or processing stability is deteriorated. there is a problem

adhesive layer

The adhesive layer includes an acrylic resin and antimony oxide. An acrylic resin is included to impart adhesiveness to the adhesive layer, and a flame retardant is included to impart flame retardancy, but antimony oxide is included.

The adhesive layer is prepared in a layered form using an adhesive layer forming composition. For example, the adhesive layer may be formed by applying an adhesive layer forming composition including an acrylic resin, a flame retardant, a solvent, a curing agent, and a tackifier.

The adhesive layer may have a thickness of 20 to 60 μm (micrometers), preferably, a thickness of 30 to 50 μm (micrometers).

If it is thinner than the thickness, there is a problem of poor adhesiveness, and if it is thicker than the thickness, when applied in a layer form using an adhesive layer forming composition, curing is slow, and the adhesive layer is difficult to maintain sufficient strength or adhesiveness. There is a difficult problem.

The adhesive layer may include 1 to 10 parts by weight of antimony oxide based on 100 parts by weight of the acrylic resin.

The adhesive layer forming composition for forming the adhesive layer includes 1 to 10 parts by weight of antimony oxide, 100 to 200 parts by weight of a solvent, 0.1 to 10 parts by weight of a curing agent, and 1 to 15 parts by weight of a tackifier, based on 100 parts by weight of the acrylic resin. It may include wealth.

Specifically, the solvent may be, for example, toluene, xylene, ethyl acetate (EAc), methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK), and the like. A mixed solvent obtained by mixing them with each other can be used.

Meanwhile, as long as the curing agent enables the adhesive-forming composition to be formed as an adhesive layer and functions as a curing agent by reacting with an acrylic resin, various curing agents may be used without being particularly limited to the type thereof. For example, it may be an epoxy-based, chelate-based, melamine-based, isocyanate-based, aziridine-based, or oxazoline-based curing agent, and the like, and one or more curing agents may be used in combination as needed.

The tackifier is a component added to improve the adhesive strength of the adhesive layer, and can be used without particular limitation as long as it is used in the art as being capable of improving the adhesive strength. For example, it may be rosin ester, terpine phenol, petroleum-based C ₆ resin, petroleum-based C ₉ resin, etc., and if necessary, one or more suitable tackifiers may be used in combination.

In the flame retardant interior film according to the present invention, the adhesive layer may have a light transmittance of 70% or more. Preferably, it may be 75% or more.

If the transmittance is lower than the transmittance, as the present invention is intended, when the adhesive layer is exposed due to shrinkage of the substrate layer, the color of the adhesive layer becomes conspicuous and the appearance is deteriorated.

This may cause a problem in that the appearance is greatly deteriorated due to exposure to the color of the adhesive layer, especially in the case where the interior film is constructed by butt construction as described above.

acrylic resin

The acrylic resin may be used without particular limitation as long as it is capable of forming an adhesive layer and has sufficient adhesive strength to function as an interior film.

The acrylic resin refers to a pressure-sensitive adhesive obtained by polymerizing acrylate and methacrylate monomers. For example, the acrylic resin contains a functional group such as a hydroxyl group or a carboxyl group, such as hydroxyalkyl (meth)acrylate, A (meth)acrylic ester monomer containing nitrogen may be copolymerized.

The acrylic resin may have a solid content of 5 to 50%, preferably, 10 to 45%.

If the solid content is more than the above content, the viscosity of the pressure-sensitive adhesive increases significantly, making it difficult to apply, and when the solid content is less than the above content, it is difficult to form an adhesive layer of a certain thickness or more there is

antimony oxide

The flame retardant added to the adhesive layer of the existing flame retardant interior film makes the adhesive layer opaque, so when the substrate layer shrinks due to external environmental changes or the interior film is removed after use, the opaque adhesive layer is exposed to improve the appearance. There was a problem with harm.

An adhesive layer having a mainly opaque or white color is a problem that occurs when the content of the inorganic flame retardant is excessive, but when the content of the inorganic flame retardant is greatly reduced, there is a problem in that flame retardancy cannot be sufficiently secured.

In order to solve this problem, an object of the present invention is to simultaneously secure the adhesion and flame retardancy of the adhesive layer so as to maintain the original function of the flame retardant interior film while securing the transparency of the adhesive layer.

Accordingly, the adhesive layer of the flame retardant interior film according to the present invention includes antimony oxide in a predetermined amount so as to maintain the transparency of the adhesive layer, and the PVC base layer contains antimony oxide, a silicic acid-based flame retardant, and a metal hydroxide-based flame retardant in a predetermined amount. By configuring to include the content, it is possible to provide an interior film having excellent flame retardancy having a transparent adhesive layer.

Specifically, antimony oxide may refer to the composition of antimony oxide added to the PVC base layer. The antimony oxide included in the adhesive layer may be the same as or different from the antimony oxide of the PVC base layer.

By including antimony oxide in the adhesive layer, transparency and flame retardancy of the adhesive layer can be secured at the same time. For example, in the case of using other inorganic flame retardants, it may be difficult to secure sufficient flame retardancy only by adding a small amount, and in the case of using the same or excessive amounts of other inorganic flame retardants, securing the transparency of the adhesive layer It may be difficult, or the viscosity of the composition for forming the adhesive layer for forming the adhesive layer is high, and the coating property may be poor.

The content of the antimony oxide included in the adhesive layer of the flame retardant interior film according to the present invention may be included in 1 to 10 parts by weight based on 100 parts by weight of the acrylic resin. Preferably, it may be included in 2 to 8 parts by weight.

When added in excess of the above content, the viscosity of the composition for forming the adhesive layer increases, making it difficult to process the composition into a layered form, and also, the transparency of the adhesive layer deteriorates, so that the adhesive layer is formed on the outside. When exposed, there is a problem of having the existing problem of damaging the appearance as it is.

When added in a smaller amount than the above content, there is a problem that sufficient flame retardancy cannot be secured.

Other flame retardants

The adhesive layer may include other flame retardants in addition to antimony oxide to improve flame retardancy.

Flame retardants that can be added may include halogen-based flame retardants. Preferably, a brominated flame retardant may be added.

In the case of adding the bromine-based flame retardant, there is an advantage in maintaining transparency without reducing the adhesive strength of the adhesive layer.

The other flame retardant is not particularly limited as long as it is a known flame retardant and can be used. However, since the adhesive layer included in the interior film according to the present invention must have excellent flame retardancy and adhesiveness and transparency, it can be appropriately added within a range that does not deteriorate it. can

In particular, the other flame retardants refer to all other flame retardants other than antimony oxide added to the adhesive layer, and are appropriately added within the scope of the present invention without distinction between additive flame retardants, reactive flame retardants, inorganic flame retardants, and organic flame retardants. It can be.

For example, the organic flame retardant may include a phosphorus-based flame retardant, a nitrogen-based flame retardant, a halogen-based flame retardant, a bromine-based flame retardant, and the like. However, in the case of an inorganic flame retardant, inorganic flame retardants other than antimony oxide added to the adhesive layer are referred to as other flame retardants, and may be added within a range that does not deviate from the object of the present invention.

Specifically, the adhesive layer may further include a brominated flame retardant as other flame retardants, and the brominated flame retardant may be added in an amount of 10 to 30 parts by weight of the brominated flame retardant based on 100 parts by weight of the acrylic resin.

Similar to the adhesive layer, the PVC base layer may further include other flame retardants capable of improving flame retardancy.

Any other flame retardant of the PVC base layer may be used without particular limitation as long as it is a known flame retardant, and unlike the adhesive layer, there is no restriction that transparency other than flame retardancy should be satisfied, so the object of the present invention is not limited in kind. It can be appropriately added within a range that does not deviate.

Therefore, in the case of other flame retardants of the PVC base layer, the content is not particularly limited, but the physical properties of the base layer forming composition are lowered, so that the base layer cannot be formed by the calendering process or the rigidity is lowered. It can be added in various ways within a range in which the physical properties required for are not deteriorated.

The other flame retardants refer to all other flame retardants except for the antimony oxide, silicic acid-based flame retardants and metal hydroxide-based flame retardants of the PVC base layer, and do not distinguish among additive flame retardants, reactive flame retardants, inorganic flame retardants, and organic flame retardants in the present invention. It can be suitably added within this target range.

For example, phosphorus-based flame retardants, nitrogen-based flame retardants, halogen-based flame retardants, bromine-based flame retardants, etc. may be included as organic flame retardants, and metal compounds, inorganic phosphorus-based flame retardants, etc. may be included as inorganic flame retardants.

etc

In the flame retardant interior film according to the present invention, an additional layer may be provided within a range not departing from the object of the present invention. It is possible to configure additional layers such as a printing layer and a surface coating layer in various ways.

It is also possible to add additional layers or additives within the range of satisfying the adhesiveness and flame retardancy as the inherent functions of the flame retardant interior film and solving the problem after butt construction of the existing flame retardant interior film to be solved by the present invention.

Specifically, the flame retardant interior film according to the present invention has a peel force of 1.80 kg / in or more measured according to ASTM D3330, and at the same time, according to ISO 5660-1, the total heat release measured by a cone calorimeter measurement method (THR, Total Heat Release) value is characterized in that it satisfies 8.0 MJ / m ² or less.

The peeling force corresponds to a level of physical properties suitable for commercialization as an interior film product, and the flame retardant performance satisfies the standard for commercialization as a flame retardant interior film product, and the flame retardant interior film according to the present invention is an adhesive layer having transparency. It is characterized in that it satisfies this sufficient adhesiveness and has flame retardancy.

In addition, the flame retardant interior film according to the present invention may have a tensile strength of 15 to 30 MPa. Preferably, it may be 20 to 25 MPa.

When the above range is satisfied, it can be considered to have flexibility and durability required as an interior film, and the corresponding physical properties have properties due to the physical properties of the PVC base layer of the interior film.

Hereinafter, an embodiment of the present invention will be described in detail so that those skilled in the art can easily practice it, but this is only one example, and the scope of the present invention is Not limited.

[Production Example]

Interior films were prepared based on Tables 1 and 2 below.

After mixing the composition containing polyvinyl chloride for the base layer, a stretched polyvinyl chloride base layer in the form of a film was prepared to a thickness of 100 μm (micrometers) by a calendering method.

A laminate was prepared by laminating a transparent PVC film on one side of the prepared substrate layer.

An acrylic resin copolymerized with butyl acrylate, 2-ethylhexyl acrylate, methyl acrylate and acrylic acid was mixed with ethyl acetate as a solvent, and a flame retardant was added.

The composition was coated on a release paper and dried at 110 ° C. for 3 minutes to prepare a flame retardant adhesive layer. After drying, the thickness was about 35 μm (micrometers).

An interior film was prepared by laminating the prepared adhesive layer and the laminate.

Unit: phr Example comparative example One 2 3 One 2 3 4 5 6 7 8 9 10 11 PVC
base layer PVC 100 plasticizer 30 heat stabilizer 5 processing aid 3 impact modifier 5 adhesive layer acrylate resin 100 curing agent 2 2 2 2 2 2 2 10 2 2 2 2 2 2 tackifier 5 5 5 5 5 5 5 5 5 5 5 10 5 5

(unit: phr) Example comparative example One 2 3 One 2 3 4 5 6 7 8 9 10 11 PVC
base layer antimony trioxide 5 10 5 0 5 5 5 5 5 5 5 5 15 5 aluminum hydroxide
+ Magnesium Hydroxide 20 10 20 20 20 20 20 20 30 20 10 20 20 20 silicate 5 5 5 5 0 5 5 5 5 5 18 5 5 5 adhesive layer antimony trioxide 5 5 3 5 5 0 5 5 5 11 5 5 5 3 4,4'-(1-Methylethylidene)-bis[2,6-dibromophenol]polymer with (chloromethyl)oxirane and 2,4,6-tribromophenol 20 20 15 20 20 20 0 20 20 14 20 20 20 25

[Experimental example]

For the manufactured interior film, the physical properties were evaluated as follows and shown in Table 3.

1. Adhesive layer light transmittance test

The adhesive layer prepared in Preparation Example was coated on top of transparent PET to measure the transmittance of the adhesive.

Transmittance was evaluated by irradiating light with a wavelength of 550 nm using Haze-gard plus (manufacturer BYK Gardner GmbH/AB NEXO).

2. Measurement of total heat release

In order to evaluate the flame retardant performance of the interior film, the evaluation was conducted according to the cone calorimeter measurement method (ISO-5660-1).

After preparing each interior film as a sample that meets the standard, evaluation was conducted. If the total heat release amount for each interior film is 8.0 MJ/m ² or less, it is evaluated as 'good', and if it is 7.2 MJ/m ² or less, it is evaluated as 'excellent'.

3. Peel force

After attaching the interior film to the SUS substrate according to ASTM D3330 (2 kg, 5 times reciprocating), the peel force was measured by peeling at a rate of 300 mm/min.

4. Tensile strength

Tensile strength was measured using a tensile strength tester (equipment name, company name).

Example comparative example One 2 3 One 2 3 4 5 6 7 8 9 10 11 Light transmittance of adhesive layer (%) 85 83 88 85 82 92 88 85 82 56 80 81 84 65 total heat release
(MJ/m ² ) 7.5 7.3 7.9 10.2 9.8 8.9 8.3 7.5 7.3 7.0 8.5 7.6 6.9 7.0 Peel force
(kg/in) 2.0 2.1 2.4 2.1 2.2 2.8 2.2 1.0 2.2 1.9 1.9 1.2 2.1 2.0 tensile strength
(MPa) 23 25 20 28 24 26 25 24 13 24 19 23 11 25

Referring to Table 3, it can be seen that the specimens of Examples have a transparent adhesive layer, excellent adhesive strength of the adhesive layer, and excellent tensile strength of the interior film itself, compared to the comparative examples.

Specifically, in the case of Comparative Examples 7 and 11, as the transparency of the adhesive layer is reduced, as a problem to be solved in the present invention, after the interior film is butt-constructed, the change in the construction environment over a long time (temperature change, humidity change) etc.), when the adhesive layer is exposed due to shrinkage of the PVC base layer, the opaque color of the adhesive layer is exposed to the outside, resulting in a problem of spoiling the appearance.

On the other hand, in the case of Comparative Examples 1 to 4, it can be confirmed that the light transmittance of the adhesive layer is high, indicating that the adhesive layer is transparent. You can check.

In the case of Comparative Examples 5 and 9, it can be seen that they have the lowest adhesive strength, which seems to have rather deteriorated as the curing agent and tackifier were excessively added to the adhesive layer.

In the case of Comparative Examples 6 and 10, it can be confirmed that the tensile strength is low. This is because the flexibility of the base layer constituting the interior film is greatly reduced as the solid content is excessively added to the base layer.

As such, the flame retardant interior film according to the embodiment has a transparent adhesive layer and is suitable for use in butt construction, has excellent adhesion of the adhesive layer, and excellent flame retardancy of the flame retardant interior film itself, and has tensile properties required as an interior film. can be confirmed to be satisfied.

Claims (9)

It has a structure in which an adhesive layer and a PVC base layer are sequentially laminated,
The PVC base layer includes antimony oxide, a silicic acid-based flame retardant, and a metal hydroxide-based flame retardant,
The adhesive layer includes an acrylic resin, antimony oxide, and a bromine-based flame retardant,
The antimony oxide of the PVC base layer, the metal hydroxide-based flame retardant, and the silicate-based flame retardant are added in a weight ratio of 1: 1 to 5: 0.2 to 3,
The antimony oxide of the PVC base layer is included in 1 to 12.5 parts by weight based on 100 parts by weight of polyvinyl chloride,
The adhesive layer includes 10 to 30 parts by weight of a brominated flame retardant and 1 to 10 parts by weight of antimony oxide based on 100 parts by weight of the acrylic resin,
The light transmittance of the adhesive layer is 70% or more,
A flame retardant interior film characterized in that the peel force measured according to ASTM D3330 is 1.80 kg / in or more.
delete According to claim 1,
Antimony oxide of the PVC base layer, the metal hydroxide-based flame retardant and the silicate-based flame retardant are added in a weight ratio of 1: 1 to 4.5: 0.4 to 1.2 flame retardant interior film.
delete delete delete delete According to claim 1,
The flame retardant interior film,
In accordance with ISO 5660-1 regulations, the total heat release (THR, Total Heat Release) value measured by the cone calorimeter measurement method is 8.0 MJ / m ² or less flame retardant interior film.
According to claim 1,
The flame retardant interior film has a tensile strength of 15 to 30 MPa.