KR102408707B1 - Interior film - Google Patents

Abstract

A polyvinyl chloride film layer and a flame-retardant adhesive layer, wherein the flame-retardant adhesive layer includes an antimony trioxide flame retardant and a bromine-based flame retardant, and the visible light transmittance of the flame-retardant adhesive layer is 65% or more, according to ISO 5660-1 , An interior film having a total heat release (THR) value of 8 MJ/m ² or less measured by a cone calorimeter measurement method is provided.

Description

Interior film {INTERIOR FILM}

The present invention relates to an interior film.

The previously developed interior film uses a mixture of a flame retardant in an adhesive to impart flame retardancy. As flame retardants, there are inorganic flame retardants and halogen flame retardants, which have good performance but are characterized by color (white). Calendered PVC is used for the interior film, and PVC stretched during processing has a property of being contracted by heat. Therefore, in the case of overlapping construction like an interior film, PVC shrinks and an opaque adhesive is exposed at the top.

It is an object of the present invention to provide an interior film to which a flame-retardant adhesive layer imparted with transparency is applied so as not to be conspicuous while implementing excellent flame-retardant performance.

Another object of the present invention is to provide an interior film having excellent adhesion performance of the flame-retardant adhesive layer.

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 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 the means and combinations thereof indicated in the appended claims.

In one embodiment of the present invention, it includes a polyvinyl chloride film layer and a flame-retardant adhesive layer, wherein the flame-retardant adhesive layer includes an antimony trioxide flame retardant and a bromine-based flame retardant, and has a visible light transmittance of 65% or more, according to ISO 5660-1 Based on this, the interior film having a total heat release (THR) value of 8 MJ/m ² or less measured by a cone calorimeter measurement method is provided.

The interior film according to the present invention has excellent flame-retardant performance, and even if the upper polyvinyl chloride film layer is contracted and the lower flame-retardant adhesive layer is exposed, it is transparent and inconspicuous, so that the aesthetic effect can be excellently maintained.

In addition, the interior film according to the present invention has excellent adhesion of the flame-retardant adhesive layer.

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

1 schematically shows a cross-section of an interior film according to an embodiment of the present invention.

The above-described objects, features and advantages will be described below in detail with reference to the accompanying drawings, and accordingly, those of ordinary skill in the art to which the present invention pertains will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist 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.

In the following, that an arbitrary component is disposed on the "upper (or lower)" of a component or "above (or below)" of a component means that any component is disposed in contact with the upper surface (or lower surface) of the component. Furthermore, it may mean that other components may be interposed between the component and any component disposed on (or under) the component.

Also, when it is described that a component is "connected", "coupled" or "connected" to another component, the components may be directly connected or connected to each other, but other components are "interposed" between each component. It is to be understood that “or, each component may be “connected,” “coupled,” or “connected,” through another component.

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

In one embodiment of the present invention, there is provided an interior film comprising a polyvinyl chloride film layer and a flame-retardant adhesive layer.

1 is a cross-sectional view of an interior film 100 according to an embodiment of the present invention.

In FIG. 1 , the interior film 100 includes a polyvinyl chloride film layer 10 and a flame-retardant adhesive layer 20 formed on one surface of the polyvinyl chloride film layer 10 .

The flame-retardant adhesive layer 20 includes an antimony trioxide flame retardant and a bromine-based flame retardant. The flame-retardant adhesive layer 20 satisfies the condition of (A) below, and the interior film 100 including the flame-retardant adhesive layer 20 satisfies the condition of (B).

(A) Visible light transmittance of 65% or more

(B) In accordance with ISO 5660-1, the total heat release (THR) value measured by the cone calorimeter measurement method is 8 MJ/m ² or less

With respect to the condition of (B) above, the method of measuring cone calorimeter (ISO 5660-1) will be described in more detail.

First, the sample is prepared by standing at 23±2 ℃, (50±5)RH% until the weight becomes constant (pre-treatment). The standard of the sample is prepared as (100mm)×(100mm)×(0.185mm±10%). A primer is applied to the upper part of the gypsum board to which the gypsum board base paper is attached to the lower surface, and the interior film is attached so that the flame-retardant adhesive layer is attached to the upper part. Cone heater radiant heat is set to 50 kW/m ² , and the flow rate is 0.24 m ³ /s, and the prepared sample and the sample holder are placed on the mass measuring device. After removing the radiation shielding device, heat it (radiation for 20 minutes based on non-combustibility). Measure the total heat release.

As the polyvinyl chloride (PVC) film layer, a conventional polyvinyl chloride film used for interior films may be widely used. For example, a polyvinyl chloride film calendered as an interior film may be used. The polyvinyl chloride film stretched in the calendering process has a property of being contracted by heat. When the polyvinyl chloride film shrinks, a problem in which the lower adhesive layer is exposed may occur. Overlap construction, which is one of the interior film construction methods, can prevent the lower substrate from being exposed at the joint between the interior films due to the overlapped portion even when the polyvinyl chloride film shrinks, but the adhesive layer to which the polyvinyl chloride film is attached can be exposed have.

In the interior film, the pressure-sensitive adhesive layer to which the polyvinyl chloride film is attached needs to be provided with flame retardancy in order to satisfy regulations by various laws and regulations. In general, flame retardancy may be imparted by adding a flame retardant to the pressure-sensitive adhesive layer. As a flame retardant with excellent flame retardancy, inorganic flame retardants and halogen-based flame retardants can be used, but when they are added, the adhesive layer turns white, so when the adhesive layer is exposed according to the shrinkage of the polyvinyl chloride film, aesthetically poor results cause

The flame-retardant adhesive layer is transparently implemented by satisfying the conditions of (A) and (B) while imparting flame retardancy. Therefore, even if the flame-retardant adhesive layer is exposed according to the shrinkage of the polyvinyl chloride film, the polyvinyl chloride film layer present at the bottom can be seen through the overlapping construction. Therefore, the interior film may cause an optical illusion that the flame-retardant adhesive layer is not visible even if the polyvinyl chloride film layer is shrunk, thereby solving the problem of conventional polyvinyl chloride shrinkage.

The polyvinyl chloride film layer may be a PVC film prepared from a composition in which a PVC resin is a basic resin, a plasticizer, a stabilizer, a pigment, a flame retardant, and other additives are mixed.

In one embodiment, the polyvinyl chloride film layer may be a stretched PVC film.

The polyvinyl chloride film layer may include an organic or inorganic flame retardant.

The flame-retardant adhesive layer may include an acrylate-based adhesive including an acrylate-based resin.

The acrylate-based pressure-sensitive adhesive may include an acrylate-based resin polymerized based on a (meth)acrylic ester monomer. The acrylate-based resin may be copolymerized with a (meth)acrylic ester monomer containing a functional group such as a hydroxyl group or a carboxyl group, or containing a nitrogen, such as hydroxyalkyl (meth)acrylate.

The flame retardant included in the flame-retardant adhesive layer includes an antimony trioxide flame retardant and a bromine-based flame retardant. Since the bromine-based flame retardant is decomposed and temporarily consumed at a specific temperature, the driving temperature that can produce the flame retardant effect is limited, but when mixed with the antimony trioxide flame retardant, the bromine radical is consumed because the antimony trioxide catches the bromine radical. It does not disappear, and it is possible to maintain the flame retardant effect by continuously stabilizing hydrogen or hydroxy radicals. Therefore, the antimony trioxide flame retardant and the bromine-based flame retardant together exert a stable flame retardant effect in a wide temperature range, and can effectively block oxygen radicals as a flame retardant. That is, the flame-retardant adhesive layer contains the antimony trioxide flame retardant and the bromine-based flame retardant together, thereby stably exhibiting an excellent flame retardant effect.

The content of the flame-retardant adhesive layer can be adjusted to satisfy the conditions of (A) and (B) described above while exhibiting an excellent flame-retardant effect.

Specifically, the flame-retardant adhesive layer may include about 6.0 to about 9.5 parts by weight of the antimony trioxide flame retardant based on 100 parts by weight of the acrylate-based resin, and more specifically, about 6.5 to about 9.5 parts by weight.

The flame-retardant adhesive layer may include the antimony trioxide flame retardant in the content ratio, while providing an excellent flame retardant effect, while satisfying the conditions of (A) and (B).

Specifically, the flame-retardant adhesive layer may include about 7.0 to about 9.0 parts by weight of the bromine-based flame retardant based on 100 parts by weight of the acrylate-based resin.

In one embodiment, the flame-retardant adhesive layer may further include a phosphorus-based flame retardant. The phosphorus-based flame retardant may be added as a transparent liquid or in the form of a powder that can be dissolved in a solvent. Phosphorus-based flame retardants can act to block oxygen access by causing a char film to form on the surface more quickly in combustion conditions. Accordingly, the flame-retardant adhesive layer may further include the phosphorus-based flame retardant to further improve flame-retardant performance.

The flame-retardant adhesive layer may include about 4.0 parts by weight or less, specifically, about 1 to about 4 parts by weight of the phosphorus-based flame retardant based on 100 parts by weight of the acrylate-based resin.

The flame-retardant adhesive layer contains the phosphorus-based flame retardant in the content ratio to provide a better flame retardant effect, while satisfying the conditions of (A) and (B), and the color index L* to be described later at the same time. and can achieve excellent adhesion.

In addition, the flame-retardant adhesive layer 20 may have a color index L* of 80 or more measured using a color difference meter. The flame-retardant adhesive layer may be implemented more transparently by satisfying the conditions of the color index L* as well as the above (A) and (B).

The flame-retardant adhesive layer contains the antimony trioxide flame retardant in the above-described content, for example, the content ratio, while exhibiting an excellent flame-retardant effect, and at the same time the conditions of (A) and (B), and at the same time the color index L*. can also be satisfied.

In one embodiment, the flame-retardant adhesive layer may have a peel force of 1.80 kg/in or more, specifically 1.80 kg/in to 3.0 kg/in, measured by a 180° peel force test method based on ASTM D3330.

The acrylate-based pressure-sensitive adhesive may further include a curing agent, a tackifier, and other additives. As the other additives, a wide range of known agents commonly added depending on the application may be used. For example, as the curing agent, a melamine curing agent, an epoxy curing agent, a chelate curing agent, and the like may be used.

Hereinafter, Examples and Comparative Examples of the present invention will be described. The following examples are only examples of the present invention, and the present invention is not limited to the following examples.

(Example)

Examples 1-4 and Comparative Examples 1-9

(1) Preparation of polyvinyl chloride film layer

It was prepared by mixing a polyvinyl chloride composition according to the prescription in Table 1 below.

A stretched polyvinyl chloride film in the form of a film was prepared by calendering the polyvinyl chloride composition.

substance name Dosage (phr) PVC resin (LS100, LG Chem) 100 plasticizer 25 stabilizator 5 Impact modifier (MBS) 5 Flame retardant (inorganic hydroxide) 20 Flame Retardant (Sb ₂ O ₃ ) 5 Pigment (Titanium Oxide)
: color implementation 5

(2) Preparation of flame-retardant adhesive layer

An acrylic resin copolymerized with butyl acrylate, 2-ethylhexyl acrylate, methyl acrylate and acrylic acid (resin total amount: 38 wt %) was mixed with ethyl acetate (62 wt %) as a solvent, and trioxide was prepared as shown in Table 2 below. An antimony flame retardant was mixed (but not used in Comparative Examples 1 and 9), and as a bromine-based flame retardant, 4,4'-(1-methylethylidene)bis[2 to which ((chloromethyl)oxirane was added) ,6-dibromophenol]polymer and 2,4,6-tribromophenol) (CAS No. 158725-44-1) were added at 8 phr.

In Example 4 and Comparative Example 9, as a phosphorus-based flame retardant, phenoxyphosphazene oligomer (P 13.4wt%, N 6wt%), which is a phosphorus-nitrogen-based flame retardant, was added.

The composition prepared as described above was coated on a release paper and dried at 110° C. for about 3 minutes to prepare a flame-retardant adhesive layer. After drying, the coating thickness was about 35 to 40 μm.

For evaluation, the specimen for measuring the transparency and color difference value of the flame-retardant adhesive layer was coated with the composition on a transparent film to measure the transparency and color difference value. In the case of a specimen for measuring other physical properties, an interior film including a polyvinyl chloride film layer and a flame-retardant adhesive layer was prepared by laminating it with the previously prepared polyvinyl chloride film.

division acrylic resin
(phr) Antimony trioxide flame retardant content
(phr) Brominated flame retardant content
(phr) Phosphorus based flame retardant content
(phr) Comparative Example 1 100 0 8 0 Comparative Example 2 100 2.3 8 0 Comparative Example 3 100 3.45 8 0 Comparative Example 4 100 4.6 8 0 Comparative Example 5 100 5.175 8 0 Comparative Example 6 100 5.75 8 0 Example 1 100 6.9 8 0 Example 2 100 8.05 8 0 Example 3 100 9.2 8 0 Comparative Example 7 100 11.5 8 0 Comparative Example 8 100 23 8 0 Example 4 100 6.9 8 3 Comparative Example 9 100 0 8 23

evaluation

Experimental Example 1

The L* value based on CIE1931 was measured using a color difference measuring instrument (KONICA MINOLTA SENSING, InC., CM-700d).

Specifically, the compositions of Examples and Comparative Examples were coated on a transparent PET film to form a flame-retardant adhesive layer (thickness: 500 μm), and then the L* value was measured. At this time, the light source was applied as D65 of KS standard. At this time, L* is closer to 100 as it is transparent, and the lower the value, the more opaque it is. At this time, the light source was applied as D65 of KS standard.

Experimental Example 2

Transmittance was evaluated by irradiating light with a wavelength of 550 nm using Haze-gard plus (manufacturer BYK Gardner GmbH/AB NEXO). Specifically, the composition of Examples and Comparative Examples was coated on a transparent PET film to form a flame-retardant adhesive layer (thickness: 500 μm), and then transmittance was measured.

Experimental Example 3

In accordance with ISO 5660-1, a total heat release (THR) value measured by a cone calorimeter measurement method was measured.

First, the sample was prepared at 23±2 ℃, (50±5)RH% until the weight became constant (pretreatment). The standard of the sample was prepared as (100mm)×(100mm)×(0.185mm±10%). A primer was applied to the upper part of the gypsum board having the gypsum board base paper attached to the lower surface, and the interior film was attached so that the flame-retardant adhesive layer was attached to the upper part. The cone heater radiant heat was set to 50 kW/m ² , and the flow rate was 0.24 m ³ /s, and the prepared sample and the sample holder were placed still on the mass measuring device. After removing the radiant heat shield, it was heated (radiation for 20 minutes on a non-combustible basis). The total heat release was measured.

Experimental Example 4

According to ASTM D3330 standard, the interior film was attached so that the flame-retardant adhesive layer was attached to the top of SUS (stainless steel). And, the peeling force (kg/in) between the flame-retardant adhesive layer and the polyvinyl chloride film was evaluated.

The results are shown in Table 3 below.

division color difference value
(L*) transmittance
(%) THR
(MJ/m ² ) peel force
(kg/in) Comparative Example 1 94.74 92.6 9.25 2.00 Comparative Example 2 94.11 83.8 8.81 1.94 Comparative Example 3 93.64 79.9 8.55 1.92 Comparative Example 4 92.66 76.2 8.49 1.93 Comparative Example 5 91.53 75.2 8.42 1.87 Comparative Example 6 91.05 74.3 8.39 1.86 Example 1 89.51 72.2 7.20 1.90 Example 2 85.30 67.0 6.92 1.88 Example 3 84.25 67.1 6.78 1.85 Comparative Example 7 75.65 60.2 6.6 1.82 Comparative Example 8 70.45 49.5 6.23 1.80 Example 4 88.90 72.2 6.97 1.84 Comparative Example 9 93.97 92.4 7.85 1.00

It can be seen that Examples 1-4 satisfy both the color difference value and the transmittance condition to secure a predetermined transparency, and the THR value is all 8 MJ/m ² or less, and at the same time, excellent flame retardant properties are realized together, It was confirmed that the peeling force was 1.80 kg/in or more, indicating excellent adhesion performance.

As described above, the present invention has been described with reference to the illustrated drawings, but the present invention is not limited by the embodiments and drawings disclosed in this specification, and a variety of It is obvious that variations can be made. In addition, even if the effect of the configuration of the present invention is not explicitly described and described while explaining the embodiment of the present invention, it is natural that the effect predictable by the configuration should also be recognized.

10: polyvinyl chloride film layer
20: flame retardant adhesive layer
100: interior film

Claims (10)

It includes a polyvinyl chloride film layer and a flame-retardant adhesive layer,
The flame-retardant adhesive layer includes an antimony trioxide flame retardant and a bromine-based flame retardant,
Visible light transmittance of the flame-retardant adhesive layer is 65% or more,
The flame-retardant adhesive layer has a color index L* of 80 or more measured using a color difference meter,
According to ISO 5660-1, if the total heat release (THR) value measured by the cone calorimeter method is 8 MJ/m ² or less,
interior film.
According to claim 1,
The flame-retardant pressure-sensitive adhesive layer includes an acrylate-based pressure-sensitive adhesive containing an acrylate-based resin
interior film.
3. The method of claim 2,
The flame-retardant adhesive layer comprises 6.0 to 9.5 parts by weight of the antimony trioxide flame retardant based on 100 parts by weight of the acrylate-based resin
interior film.
3. The method of claim 2,
The flame-retardant adhesive layer comprises 7.0 to 9.0 parts by weight of the bromine-based flame retardant relative to 100 parts by weight of the acrylate-based resin
interior film.
According to claim 1,
The flame-retardant adhesive layer further comprises a phosphorus-based flame retardant
interior film.
3. The method of claim 2,
The flame-retardant adhesive layer further comprises 4.0 parts by weight or less of a phosphorus-based flame retardant based on 100 parts by weight of the acrylate-based resin.
interior film.
3. The method of claim 2,
The flame-retardant adhesive layer has a peel force of 1.80 kg/in or more, measured according to ASTM D3330
interior film.
delete According to claim 1,
The polyvinyl chloride film layer is a stretched PVC film
interior film.
According to claim 1,
The polyvinyl chloride film layer includes an organic or inorganic flame retardant
interior film.

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