KR20230095029A - Environment-friendly interior film having excellent flame retardant - Google Patents

Abstract

It includes a base layer and a coating layer, wherein the base layer is a polyvinyl chloride film layer including a polyvinyl chloride (PVC) resin and a composite flame retardant, and the composite flame retardant includes a phosphorus-based flame retardant, a melamine-containing non-phosphorus flame retardant, and a molybdenum-based flame retardant. An interior film is provided.

Description

Eco-friendly interior film with excellent flame retardancy {ENVIRONMENT-FRIENDLY INTERIOR FILM HAVING EXCELLENT FLAME RETARDANT}

The present invention relates to an eco-friendly interior film having excellent flame retardancy.

Interior film is relatively inexpensive, durable, and highly productive, so polyvinyl chloride (PVC) is mainly used.

In general, films containing polyvinyl chloride have exhibited excellent flame retardancy by including antimony trioxide as a flame retardant. However, antimony trioxide is a harmful substance that may cause cancer, and there is a movement to regulate the substance in Europe. Accordingly, there is a demand for a film that exhibits excellent flame retardancy without using antimony trioxide as a flame retardant and is easy to process without impairing the physical properties of the polyvinyl chloride film.

An object of the present invention is an interior film that does not use antimony trioxide or reduces its amount, while exhibiting eco-friendliness, excellent flame retardancy, without compromising the function of a film containing polyvinyl chloride, maintaining excellent physical properties, and being easy to process. is to provide

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention not mentioned above can be understood by the following description and will be more clearly understood by the examples of the present invention. It will also be readily apparent that the objects and advantages of the present invention may be realized by means of the instrumentalities and combinations indicated in the claims.

It includes a base layer and a coating layer according to the present invention, wherein the base layer is a polyvinyl chloride film layer containing a polyvinyl chloride (PVC) resin and a composite flame retardant, wherein the composite flame retardant is a phosphorus-based flame retardant, a melamine-containing non-phosphorus flame retardant, and molybdenum. An interior film containing a flame retardant-based agent may be provided.

The interior film according to the present invention may exhibit excellent flame retardancy while exhibiting eco-friendliness without using antimony trioxide or by reducing the amount of antimony trioxide. In addition, excellent aesthetics and processability can be exhibited along with a certain or more excellent physical properties required for the polyvinyl chloride film layer, which is the base layer.

In addition to the effects described above, specific effects of the present invention will be described together while explaining specific details for carrying out the present invention.

1 schematically shows a cross section of an interior film according to an embodiment of the present invention.
2 is a graph showing a change in torque over time of the composition for a base layer of Example 1 according to one embodiment of the present invention.
Figure 3 is in the process of mixing the composition for the substrate layer of Example 1 according to one embodiment of the present invention according to Experimental Example 2, (a) shows the color of the mixed composition after the P1 point, (b) It is a photograph showing the color of the composition after the point P2.

The above objects, features and advantages will be described later in detail with reference to the accompanying drawings, and accordingly, those skilled in the art to which the present invention belongs will be able to easily implement the technical spirit of the present invention. In describing the present invention, if it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

Hereinafter, the arrangement of an arbitrary element on the "upper (or lower)" or "upper (or lower)" of a component means that an arbitrary element is placed in contact with the upper (or lower) surface of the component. In addition, it may mean that other components may be interposed between the component and any component disposed on (or under) the component.

Hereinafter, interior films according to some embodiments of the present invention will be described.

In one embodiment of the present invention, an interior film including a base layer and a coating layer is provided.

1 is a cross-sectional view of an interior film 100 according to an embodiment of the present invention. As shown in FIG. 1 , the interior film 100 includes a base layer 20 and a coating layer 10 formed on one surface of the base layer 20 .

The base layer is a polyvinyl chloride film layer including a polyvinyl chloride (PVC) resin and a composite flame retardant, and the composite flame retardant includes a phosphorus-based flame retardant, a melamine-containing non-phosphorus flame retardant, and a molybdenum-based flame retardant.

In general, a film constituting a base layer of an interior film mainly includes a lot of polyvinyl chloride (PVC). Polyvinyl chloride itself has a halogen-based (Cl) component, and polyvinyl chloride films have so far shown excellent flame retardancy by including antimony trioxide as a flame retardant. However, antimony trioxide is a harmful substance that may cause cancer, and there is a movement to regulate the substance. Accordingly, there is a need for an environmentally friendly flame retardant that can replace antimony trioxide.

In addition, a polyvinyl chloride film containing polyvinyl chloride is generally processed by heat, and when thermal stability is low, it may easily discolor during processing, resulting in deterioration in aesthetics and marketability. Accordingly, a film capable of exhibiting excellent flame retardancy by adding a flame retardant to a polyvinyl chloride resin and exhibiting excellent thermal stability without reducing the workability of the polyvinyl chloride film and exhibiting excellent physical properties above a certain level is required.

The polyvinyl chloride film layer, which is the base layer, includes polyvinyl chloride (PVC) and a specific composite flame retardant, and may exhibit excellent flame retardancy while exhibiting excellent eco-friendliness by including no or little antimony trioxide. In addition, even when the polyvinyl chloride film is thermally processed due to its excellent thermal stability, the film is not easily carbonized or discolored, so that processability is excellent and excellent physical properties can be exhibited at the same time.

In general, it may be desired to impart flame retardancy by including a flame retardant in the film. However, it is not easy to achieve the above object when a commonly used flame retardant such as a phosphorus-based flame retardant is simply mixed with a polyvinyl chloride film. For example, a phosphorus-based flame retardant itself is often used as a flame retardant, but the flame retardant effect is not sufficient, there is a problem of lowering the basic physical properties and stability of polyvinyl chloride, and there may be a problem of poor thermal stability. In addition, in the case of flame retardants containing aluminum, they tend to break the structure of polyvinyl chloride, and the properties and physical properties of the film may be lowered. Since the carbonized film is not formed firmly on the polyvinyl chloride film, the film stretches when heat is applied, which may cause the spread of fire or other fires.

The base layer may include a composite flame retardant including a phosphorus-based flame retardant, a melamine-containing non-phosphorus flame retardant, and a molybdenum-based flame retardant in a polyvinyl chloride resin, thereby exhibiting excellent eco-friendliness. In addition, it can exhibit excellent flame retardancy by forming a carbonized area of less than a certain level with respect to the flame, and exhibit excellent flame retardancy with structural stability by preventing sagging of the film due to flame by forming a carbonized film firmly and well. In addition, the polyvinyl chloride film is easily carbonized even during thermal processing so that discoloration does not occur, so that it has excellent processability and exhibits excellent physical properties at the same time.

Specifically, the phosphorus-based flame retardant may include one selected from the group consisting of melamine polyphosphate, ammonium polyphosphate, diammonium phosphate, monoammonium phosphate, polyphosphoric acid amide, phosphoric acid amide, melamine phosphate, red phosphate, and combinations thereof. . For example, melamine polyphosphate, which is a phosphorus-based flame retardant containing melamine, may be included.

The polyvinyl chloride film layer includes the phosphorus-based flame retardant to trap active radicals of hydrogen radicals and hydroxyl radicals generated during combustion to prevent the combustion reaction from occurring in a chain, and to form an inert gas such as nitrogen to By blocking the access of oxygen and forming phosphoric acid, it is possible to form and promote a carbonized film through excellent carbonization.

The melamine-containing non-phosphorus flame retardant may include melamine cyanurate. The melamine-containing non-phosphorus flame retardant may be included in the polyvinyl chloride film to improve processability of the polyvinyl chloride film and further improve flame retardancy. Specifically, the melamine-containing non-phosphorus flame retardant generates nitrogen gas, which is an inert gas, to block the access of oxygen, reacts with the phosphorus-based flame retardant to harden the carbonized film, and promotes the formation of a carbonized film to prevent physical contact with oxygen. It blocks, and exhibits expansiveness when forming a carbonized film to maintain the shape of the film and carbonized film and block combustion materials.

The molybdenum-based flame retardant may include ammonium octamolybdate, zinc molybdate, or a combination thereof. For example, the polyvinyl chloride film may include molybdenum oxide, and specifically, ammonium octamolybdate.

The molybdenum-based flame retardant may be included together with the phosphorus-based flame retardant and the melamine-containing non-phosphorus flame retardant to promote carbonized film formation and suppress smoke generation.

The composite flame retardant may be included in an amount of about 15 to about 50 parts by weight based on 100 parts by weight of the polyvinyl chloride. Accordingly, it is possible to exhibit excellent flame retardant performance while exhibiting processing stability to the polyvinyl chloride film, exhibiting physical properties such as tensile strength excellently at a certain level or more. Specifically, the total content of the composite flame retardant may be 15 parts by weight or more or 20 parts by weight or more for flame retardant performance, and may be 50 parts by weight or less or 40 parts by weight or less for processing stability. The content range may include the combined range of the upper limit and the lower limit, but is not limited thereto.

For example, when the total content of the composite flame retardant is less than the above range, flame retardant performance is lowered, and when it exceeds the above range, there is no improvement in flame retardant performance, which is uneconomical, and processing stability or poor physical properties such as tensile strength Problems there may be

The composite flame retardant may include the melamine-containing non-phosphorus flame retardant to the molybdenum-based flame retardant in a weight ratio of about 140:60 to about 60:60, based on 100 parts by weight of the phosphorus-based flame retardant. For example, based on 100 parts by weight of the phosphorus-based flame retardant, the melamine-containing non-phosphorus flame retardant to the molybdenum-based flame retardant may be included in a weight ratio of about 140:60 to about 80:60.

The polyvinyl chloride film layer has an excellent flame retardant effect without discoloration during thermal processing of the polyvinyl chloride film or deterioration of physical properties such as tensile strength by including the composite flame retardant at a content ratio within the above range, that is, without sagging of the film. carbonization area can be indicated. When the content ratio of the composite flame retardant is out of the above range, flame retardancy may be deteriorated even when the total content of the composite flame retardant is the same.

The weight ratio of the phosphorus-based flame retardant to the melamine-containing non-phosphorus flame retardant may be 4:6 to 8.5:1.5. or 4:6 to 6.5:3.5. And, the weight ratio of the phosphorus-based flame retardant to the molybdenum-based flame retardant may be 6.25: 3.75 to 5: 5. In addition, the weight ratio of the melamine-containing non-phosphorus flame retardant to the molybdenum-based flame retardant may be 7: 3 to 5: 5. As the composite flame retardant is included in a ratio within the above range, it is possible to better form a carbonized film (char) by exhibiting an improved synergistic effect with the phosphorus-based flame retardant and the melamine-containing non-phosphorus flame retardant. Specifically, a pore structure may be firmly formed inside the carbonized film (char), and the carbonized film may be formed thickly. And, when out of the above range, for example, the molybdenum-based flame retardant and Cl (halogen element) in the polyvinyl chloride resin lacks a synergistic effect of forming Char, which may degrade flame retardant performance.

The polyvinyl chloride film layer may be formed from a composition for a base layer including the polyvinyl chloride (PVC) resin and the composite flame retardant. Specifically, the polyvinyl chloride film may be a calendered molding of a composition including the polyvinyl chloride (PVC) resin and the composite flame retardant.

When 50 g of the composition for the base layer was mixed in a twin screw mixer (140° C., 180 rpm), the torque value over time includes the first torque inflection point (P1) and the second torque inflection point (P2), and at this time, the above The time required to reach the second torque inflection point P2 may be 30 minutes or more.

In the composition for the base layer, a polyvinyl chloride resin or the like is mixed in a state in which heat of a certain temperature is applied, and the polyvinyl chloride film formed by the composition is processed by heat and used as an interior film. As such, the composition and polyvinyl chloride film containing the polyvinyl chloride resin are subjected to heat during the mixing and/or processing process. When the composition is carbonized by the applied heat, the color of the composition changes from white to brown and begins to be carbonized hard. do.

At this time, if the time to the point of carbonization is short, processing time and conditions are limited, resulting in a problem in the processability of the polyvinyl chloride film. In addition, when producing a polyvinyl chloride film, it is not stretched into a film form and is cut off, so that continuous production is difficult and productivity is lowered. In addition, such discoloration may be a problem in an interior film in which design, aesthetics, and the like are important, and marketability may be deteriorated.

The time of carbonization as described above can be known through the time when the color of the composition changes from white to brown and becomes hard, or can be confirmed through the torque inflection point at which the torque value of the composition changes rapidly under the above conditions.

For example, Figure 2 is a graph showing the change in torque over time of the polyvinyl chloride composition for a base layer of Example 1, which is an embodiment of the present invention, and torque over time from the time of mixing the composition by introducing it into a twin screw mixer Looking at the value, as shown in FIG. 2, the first torque inflection point (P1) measured immediately by the pressure applied when the composition is introduced into the twin screw mixer has an approximately linear slope, while the torque value rapidly changes A second torque inflection point P2 appears where the color of the composition changes to brown and becomes hard. At this time, the point where the torque value changes rapidly means a point where the slope of the torque value with time changes from (-) to (+) or from almost “0” to (+). For example, the point at which the carbonization starts and the torque value rapidly changes may mean a point at which a slope change of the torque value is about 10% to about 40%.

For example, FIG. 2 shows a torque change over time of the composition of Example 1, and it can be seen that the composition of Example 1 generates a second torque inflection point P2 at about 50 minutes.

And, Figure 3 shows the color of the mixed composition after the P1 point of the composition for the base layer of Example 1 when mixing in a twin screw mixer (140 ° C, 180 rpm), and the color of the composition after the P2 point This is a picture showing the color (B). In the composition of Example 1, a second torque inflection point (P2) occurs at 50 minutes, and the mixed composition after the P1 point shows a white color, while after the second torque inflection point (P2), the composition is carbonized It can be seen that the color has changed to brown.

A composition comprising a conventional polyvinyl chloride resin is compounded and molded at a temperature of about 160°C to 200°C. At a temperature lower than the process temperature, the melt flow index of the polyvinyl chloride resin is lowered, so that more shear is applied, and frictional heat may be generated.

Therefore, in order to evaluate the thermal stability of the polyvinyl chloride film layer considering various processing conditions of the polyvinyl chloride film, a temperature of 140 ° C. lower than the mixing process temperature and 180 rpm, which takes a little more load on the composition containing polyvinyl chloride Under the harsh conditions of, the torque change and color change of the composition were measured.

Specifically, when 50 g of the composition including the polyvinyl chloride resin and the composite flame retardant was mixed in a twin screw mixer (140° C. 180 rpm), the time from the mixing point to the second torque inflection point P2 was reached at 30 may be more than a minute. For example, it may be 35 minutes to 60 minutes, 40 minutes to 60 minutes, 45 minutes to 60 minutes, or 50 minutes to 60 minutes.

Even when 50 g of the substrate layer formed from the composition for the substrate layer is mixed in a twin screw mixer (140° C. 180 rpm) as described above and the torque value over time is measured, the second torque inflection point (P2) from the mixing time The time to reach may be 30 minutes or more.

The polyvinyl chloride film layer has a time to reach the second torque inflection point (P2) in the above range, in the process of manufacturing the polyvinyl chloride film, and / or in the process of processing the polyvinyl chloride film It can be stably processed without discoloration and carbonization. That is, the interior film including the polyvinyl chloride film exhibits excellent thermal stability, and can improve productivity without compromising design and aesthetics.

The composition may further include one additive selected from the group consisting of plasticizers, (thermal) stabilizers, impact modifiers, and combinations thereof.

The base layer may have a thickness of about 100 μm to about 170 μm.

The interior film includes a coating layer on one side of the base layer, which is the polyvinyl chloride film layer.

The coating layer includes a polyvinyl chloride (PVC) resin and is transparent, and may protect the base layer and a pattern printed on the polyvinyl chloride base layer. And, the coating layer may have a thickness of about 30 μm to about 70 μm. or about 50 μm to about 70 μm.

The interior film may include an adhesive layer on the other side of the polyvinyl chloride film layer on which the coating layer is not formed. The adhesive layer may include an acrylate-based adhesive containing an acrylate-based resin. The adhesive layer may have a thickness of about 40 μm to about 60 μm. For example, it may be about 45 μm to about 55 μm.

The interior film may include a printing layer between the coating layer and the polyvinyl chloride film layer. Accordingly, internal printing can be recognized from the outside through the transparent coating layer, and excellent design can be exhibited.

In addition, a release layer may be laminated on the adhesive layer, and the type, formation method, thickness, and the like of the release layer are not particularly limited. For example, the release layer may be a polyethylene (PE) film, a polyethylene terephthalate (PET) film, a polycarbonate (PC) film, or the like.

The carbonized area of the interior film including the polyvinyl chloride film layer, which is the base layer, is measured by measuring the longest carbonized length in the horizontal and vertical lengths of the interior film in accordance with KOFEIS 1001 regulations, and based on the measured carbonized length The carbon area is measured by the method of obtaining the ellipse area. Specifically, the interior film is attached to a frame measuring 29.5 cm x 19.6 cm. (Exposure area of the film: 25 cm x 15 cm) After that, tilt the interior film at an angle of 45° so that a 4.5 cm long flame comes into contact with one side of the interior film. After that, it is exposed to a flame for 1 minute and the carbonized length is measured. When the carbonized area of the interior film exceeds 30 cm 2 according to the flame retardant performance standard of KOFEIS 1001 or is completely burned, flame retardancy is lowered and a problem of being vulnerable to fire may occur.

The interior film may have a carbonized area of about 30 cm 2 or less according to the flame retardant performance standard of KOFEIS 1001. For example, it may be about 25 cm 2 or less, about 20 cm 2 or less, or about 15 cm 2 or less. Accordingly, excellent flame retardant performance can be exhibited.

In addition, it can be seen that the polyvinyl chloride film, which is the base layer, exhibits excellent flame retardancy with a carbon area of 30 cm2 or less, 25 cm2 or less, 20 cm2 or less, 15 cm2 or less or 12 cm2 or less according to KOFEIS 1001 regulations as described above. there is.

In addition, during the performance evaluation, the polyvinyl chloride film and the interior film, which are the base layers, do not deform the structure of the film by stretching in the direction of the flame or denting as the film shrinks, and flattening the hard carbonized film while maintaining the film structure can be formed Accordingly, structural stability can be exhibited along with excellent flame retardancy. For example, a film containing a hydrate form of a flame retardant (eg, aluminum hydroxide, magnesium hydroxide, hydromagnesite) may stretch in the flame direction during the flame retardancy test. This may mean that the carbonized film is not formed firmly, and the stretched film may become another cause of flame spread due to deterioration of flame retardancy and deterioration of structural stability as the contact area with the flame widens, which can be a problem. can

The interior film may exhibit a tensile strength of about 20 MPa to about 30 MPa. or about 25 MPa to about 30 MPa or about 28 MPa to about 30 MPa. Accordingly, improved constructability can be exhibited. For example, if the tensile strength is less than the above range, handling during construction is poor, and if it exceeds the above range, when constructing an angled part (eg, a bent part), the strength of the polyvinyl chloride film becomes stronger and the film is lifted There may be a problem.

The interior film is a finishing material that protects materials and expresses the exterior in various colors and textures, and can be particularly used as a material for decorating the surface of interior products, furniture, desks, and the like.

(Example)

Examples 1 to 2, Reference Examples and Comparative Examples 1 to 5

100 parts by weight of polyvinyl chloride resin (LS100, LG Chem) was mixed with a composite flame retardant (flame retardant) according to the prescription shown in Table 1 below, and 20 parts by weight of a plasticizer, 3 parts by weight of a stabilizer and 3 parts by weight of an impact modifier were mixed with a Banbury mixer (Banbury mixer), and then primary and secondary mixing using 2 rolls to prepare the compositions for the base layer of Examples, Reference Examples and Comparative Examples. Thereafter, the composition for the base layer was calendered at a temperature of 160 ° C to 200 ° C to prepare a base layer, which is a polyvinyl chloride film layer having a thickness of 0.1 mm in Examples, Reference Examples and Comparative Examples.

In addition, 100 parts by weight of polyvinyl chloride resin (LS100, LG Chem), 20 parts by weight of plasticizer, 7 parts by weight of stabilizer, 0.5 part by weight of UV stabilizer and 3 parts by weight of processing aid were kneaded with a Banbury mixer, and then 2 The composition for the coating layer was prepared by primary and secondary mixing using this roll. Thereafter, the composition for the coating layer was calendered at a temperature of 140 to 180° C. to prepare a coating layer having a thickness of 0.05 mm.

The prepared coating layer was laminated on one side of each of the substrate layers and then laminated at a temperature of 120 to 160 ° C to prepare an interior film.

antimony trioxide melamine polyphosphate Melamine cyanurate Ammonium Octamolybdate Example 1 10 14 6 Example 2 10 14 10 reference example 30 Comparative Example 1 30 Comparative Example 2 30 Comparative Example 3 30 Comparative Example 4 18.75 11.25 Comparative Example 5 18.75 11.25

evaluation

Experimental Example 1: Carbon area and film shape measurement (flame retardancy)

A polyvinyl chloride film or interior film, which is the base layer of Examples and Comparative Examples, is attached to a frame of 29.5 cm x 19.6 cm in size. of the flame to contact the film. After exposure to the flame for 1 minute, the carbonized length is measured to obtain the carbonized area (I: carbonized area of the base layer, II: carbonized area of the interior film), and the shape of the film attached to the frame is observed.

Based on the flame retardant performance standard of KOFEIS 1001, the carbonized area is measured by measuring the longest carbonized length in the horizontal and vertical lengths of the film using a 45 ° flame retardant tester, and measuring the carbonized area by obtaining the elliptical area .

In addition, the shape of the film was visually observed after exposing the film to a flame for 1 minute, and the evaluation results were listed in Table 3 according to the criteria of Table 2 below.

In Table 2, Type 3 is a form in which the film stretches in a direction close to the flame and the area of the film in contact with the flame is wider, deteriorating flame retardancy and deteriorating the structural stability of the film, Type 2 is a form in which the film shrinks in a direction away from the flame Pie means a form that causes deformation of the film structure, and type 1 means a form that has excellent flame retardancy and structural stability by forming a flat carbonized film without significant deformation of the film structure as the film is carbonized. Type 3 is not suitable because its flame retardancy is too low, and type 1 represents the most desirable form in terms of flame retardancy and structural stability.

Experimental Example 2: Thermal stability (carbonization and discoloration)

While mixing 50 g of the compositions for the base layer of Examples and Comparative Examples at 140° C. and 180 rpm in a twin screw mixer (Brabender Internal Mixer), the change in torque value over time was measured.

As shown in FIG. 2, the first torque inflection point (P1) measured by the pressure applied when the composition is introduced into the twin screw mixer has a slope that is approximately linear and the torque value rapidly changes while the color of the composition is white A second torque inflection point (P2) that turns brown appears in .

At this time, the time from the mixing point to the second torque inflection point was measured and listed in Table 3. Figure 2 is a graph showing the torque change over time of the composition for the base layer of Example 1.

And, Figure 3 is for the composition for the base layer of Example 1, (A) shows white as the color of the mixed composition after the P1 point, while (B) changes to brown as the color of the composition after the P2 point passes indicates what has been

Experimental Example 3: Tensile strength

Interior films of Examples and Comparative Examples were prepared as specimens of 25 mm (W, width) x 120 mm (L. length) x 0.15 mm (T, thickness). And, with respect to the specimen, a dogbone sample was taken with KSM3507 No. 1 mold, using Zwick Roell's Z 1000 model UTM equipment according to ASTM D638-95, under the conditions of a speed of 300 mm/min and a distance between gauges of 40 mm The tensile strength was measured. The results are shown in Table 3 below.

Carbon area (cm2) I Carbon area (cm2) II carbonization type Thermal stability (min) Tensile strength (MPa) Example 1 12 15 type 1 50 28 Example 2 10 13 type 1 50 27 reference example 12 15 type 2 55 28 Comparative Example 1 30 40 type 3 10 25 Comparative Example 2 65 80 type 2 55 23 Comparative Example 3 42 60 type 3 38 26 Comparative Example 4 38 50 type 3 29 25 Comparative Example 5 28 40 type 1 31 22

As shown in Table 3, it can be seen that the examples exhibit similar flame retardancy compared to the reference example containing antimony trioxide. In addition, in the case of the examples, it can be seen that, while being carbonized, a carbonized film is formed flat without significant deformation of the film structure, thereby exhibiting excellent properties such as flame retardancy and structural stability at the same time. On the other hand, in the case of Comparative Example, it can be seen that flame retardancy is low such that the carbonized area exceeds 30 cm 2 , and physical properties such as thermal stability and tensile strength cannot be improved at the same time.

As described above, the present invention has been described with reference to the drawings illustrated, but the present invention is not limited by the embodiments and drawings disclosed herein, and various modifications are made by those skilled in the art within the scope of the technical idea of the present invention. It is obvious that variations can be made. In addition, although the operation and effect according to the configuration of the present invention have not been explicitly described and described while describing the embodiments of the present invention above, it is natural that the effects predictable by the corresponding configuration should also be recognized.

10: coating layer
20: base layer
100: interior film

Claims (10)

Including a base layer and a coating layer,
The base layer is a polyvinyl chloride film layer containing a polyvinyl chloride (PVC) resin and a composite flame retardant,
The composite flame retardant comprises a phosphorus-based flame retardant, a melamine-containing non-phosphorus flame retardant, and a molybdenum-based flame retardant.
interior film.
According to claim 1,
The phosphorus-based flame retardant comprises one selected from the group consisting of melamine polyphosphate, ammonium polyphosphate, diammonium phosphate, monoammonium phosphate, polyphosphoric acid amide, phosphoric acid amide, melamine phosphate, red phosphate, and combinations thereof
interior film.
According to claim 1,
The melamine-containing non-phosphorus flame retardant comprises melamine cyanurate
interior film.
According to claim 1,
The molybdenum-based flame retardant includes ammonium octamolybdate, zinc molybdate, or a combination thereof.
interior film.
According to claim 1,
The content of the composite flame retardant is 15 to 50 parts by weight based on 100 parts by weight of the polyvinyl chloride resin.
interior film.
According to claim 1,
Compared to 100 parts by weight of the phosphorus-based flame retardant, the weight ratio of the melamine-containing non-phosphorus flame retardant to the molybdenum-based flame retardant is 140:60 to 60:60
interior film.
According to claim 1,
The base layer is formed from a composition for a base layer including the polyvinyl chloride (PVC) resin and the composite flame retardant,
When 50 g of the composition was mixed in a twin screw mixer (140 ° C, 180 rpm),
The torque value over time includes a first torque inflection point P1 and a second torque inflection point P2,
At this time, the time from the mixing point to the second torque inflection point P2 is 30 minutes or more
interior film.
According to claim 1,
The coating layer includes a polyvinyl chloride (PVC) resin
interior film.
According to claim 1,
Carbonized area less than 30cm2 according to the flame retardant performance standard of KOFEIS 1001
interior film.
According to claim 1,
Tensile strength of 20 MPa to 30 MPa
interior film.

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