Flame-retardant adhesive film and decorative film materials

Abstract

To provide a halogen-free flame-retardant adhesive film and decorative film material.SOLUTION: A flame-retardant adhesive film is formed of a resin composition containing no halogen, wherein the resin composition contains 12 wt.% to 55 wt.% of a first polyolefin resin, 20 wt.% to 60 wt.% of a second polyolefin resin, 3 wt.% to 15 wt.% of a phosphorus compound having a spiro structure, and 15 wt.% to 30 wt.% of a flame retardant compound. The content of the phosphorus atom in the first polyolefin resin is 0.1 wt.% to 1.0 wt.%. The second polyolefin resin contains an ethylene polymer and a propylene polymer. The flame retardant compound contains a phosphorus-based flame retardant, and further contains at least one selected from the group consisting of a nitrogen-based flame retardant, a silicon-based flame retardant, a boron-based flame retardant, and a metal inorganic flame retardant.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a flame-retardant adhesive film and decorative film material, and more particularly to a halogen-free flame-retardant adhesive film and decorative film material. [Background technology]

[0002] Most existing flame-retardant adhesive films contain halogen-containing flame retardants added to polyolefin resins. While halogen-containing flame retardants have excellent flame retardant properties, they produce toxic gases and thick smoke during combustion, harming both humans and the environment. Therefore, this type of material cannot be used in interior building materials. Furthermore, with growing awareness of environmental protection, all parties involved are making efforts to research alternative materials.

[0003] Therefore, finding a method for improving material components to replace existing halogen-containing flame retardants and improve the flame retardancy of polyolefin resins has become one of the important challenges in this field. Summary of the Invention [Problem to be solved by the invention]

[0004] The technical problem that the present invention aims to solve is to provide a flame-retardant adhesive film and decorative film material that fills the gaps in existing technology. [Means for solving the problem]

[0005] To solve the above technical problems, one of the technical solutions adopted in the present invention is to provide a flame-retardant adhesive film. The flame-retardant adhesive film is formed from a halogen-free resin composition, which contains 12 to 55 wt% of a first polyolefin resin, 20 to 60 wt% of a second polyolefin resin, 3 to 15 wt% of a phosphorus compound having a spiro structure, and 15 to 30 wt% of a flame retardant compound. The content of phosphorus atoms in the first polyolefin resin is 0.1 to 1.0 wt%. The second polyolefin resin includes an ethylene polymer and a propylene polymer. The flame retardant compound includes a phosphorus-based flame retardant and at least one selected from the group consisting of a nitrogen-based flame retardant, a silicon-based flame retardant, a boron-based flame retardant, and a metal inorganic flame retardant.

[0006] Furthermore, the first polyolefin resin is obtained by reacting a phosphorus compound with a polyolefin, and the weight ratio of the phosphorus compound to the polyolefin is 1:10 to 1:100.

[0007] Furthermore, the phosphorus compound is selected from the group consisting of a phosphate ester having a vinyl group and a phosphate ester having a biphenyl group.

[0008] Furthermore, the phosphorus compound is a phosphorus compound having a biphenyl group and a hydroxy group.

[0009] Further, the phosphorus compound is selected from the group consisting of 9,10-dihydro-9-oxa-10-phospha-phenanthrene-10-oxide and 10-(2,5-dihydroxyphenyl)-10-hydro-9-oxa-10-phospha-phenanthrene-10-oxide.

[0010] Further, the polyolefin is selected from the group consisting of polyethylene, polypropylene, and polybutene.

[0011] Furthermore, the polyolefin has an epoxy group at its end.

[0012] Furthermore, the first polyolefin resin has one functional group, and the functional group is selected from the group consisting of a vinyl group and a biphenyl group.

[0013] Furthermore, the phosphorus atom content of the phosphorus compound having a spiro structure is 7 wt % to 15 wt %.

[0014] Furthermore, phosphorus compounds with spiro structures include bis(2,4-dichlorophenyl) P Pentaerythritol diphosphate.

[0015] Furthermore, the phosphorus-based flame retardant includes a core layer and a surface layer surrounding the core layer, and the surface layer is a carbon layer.

[0016] Furthermore, the core layer is formed from polymetaphosphoric acid.

[0017] Further, the nitrogen-based flame retardant is melamine or a derivative thereof.

[0018] Further, the silicon-based flame retardant is silicon dioxide or silane.

[0019] Furthermore, the boron-based flame retardant is a borate.

[0020] Additionally, the metallic inorganic flame retardant is selected from the group consisting of magnesium oxide, aluminum oxide, and calcium carbonate.

[0021] Furthermore, the density of the flame-retardant adhesive film is 0.9 g / cm 3 to 1.3 g / cm 3 is.

[0022] Furthermore, the phosphorus atom content of the entire flame-retardant adhesive film is 1.25 wt% to 2.0 wt%. Another technical solution adopted in the present invention to solve the above technical problems is to provide a decorative film material. The decorative film material includes the flame-retardant adhesive film and a pattern layer disposed on the flame-retardant adhesive film.

[0023] One beneficial effect of the present invention is that the flame-retardant adhesive film and decorative film material provided by the present invention can improve the flame retardancy of the flame-retardant adhesive film by the technical means that "the resin composition comprises a first polyolefin resin, a second polyolefin resin, a phosphorus compound having a spiro structure, and a flame retardant compound" and "the content of phosphorus atoms in the first polyolefin resin is 0.1 wt% to 1.0 wt%."

[0024] In order to better understand the features and technical contents of the present invention, please refer to the following detailed description of the present invention and the accompanying drawings, which are provided for reference and explanation only and are not intended to limit the scope of the present invention. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a side view schematic diagram of a flame-retardant adhesive film of the present invention. [Figure 2] 1 is a side view of a decorative film material according to the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0026] The following specific examples of the "flame-retardant adhesive film and decorative film material" according to the present application will illustrate the disclosed embodiments of the present invention. Those skilled in the art can understand the benefits and advantages of the present invention from the disclosure of this specification. The present invention can be implemented or applied in other different embodiments. Each detail in this specification can also be modified and changed in various ways without departing from the spirit of the present invention based on various aspects or applications. In addition, the drawings of the present invention are for simple and schematic illustration only and do not represent actual dimensions. The following embodiments will further explain the technical aspects of the present invention, but the disclosed contents do not limit the present invention. In addition, the term "or" used in this specification may include any one or more combinations of the related items according to actual circumstances.

[0027] To overcome the problems of toxic gases and thick smoke generated when using halogen-containing flame retardants, the present invention provides a flame-retardant adhesive film and decorative film material, which do not use halogen-based flame retardants but still have good flame retardancy.

[0028] The present invention uses a special flame retardant additive and combines it with a specific polyolefin material to form a resin composition, which can be used to produce flame retardant adhesive films with good flame retardant properties through a coating machine, and can also produce decorative films with good flame retardant properties, which combine interior beauty and safety and can replace existing halogen-containing flame retardant adhesive films.

[0029] See Figure 1. The flame-retardant adhesive film 1 of the present invention is produced from a resin composition using a coating machine. In the embodiment, the thickness of the flame-retardant adhesive film 1 can be from 0.25 mm to 0.75 mm, but the present invention is not limited thereto.

[0030] The resin composition of the present invention does not contain halogen, and when the total weight of the resin composition is 100 wt%, the resin composition contains 12 wt% to 55 wt% of a first polyolefin resin, 20 wt% to 60 wt% of a second polyolefin resin, 3 wt% to 15 wt% of a phosphorus compound having a spiro structure, and 15 wt% to 30 wt% of a flame retardant compound.

[0031] The first polyolefin resin, the phosphorus compound having a spiro structure, and the flame retardant compound contain phosphorus atoms, and by working together, the flame retardant adhesive film can have a better flame retardant effect. Specifically, based on the total weight of the entire flame retardant adhesive film (100 wt%), the content of phosphorus atoms in the flame retardant adhesive film is 1.25 wt% to 2.0 wt%, but the present invention is not limited thereto.

[0032] The first polyolefin resin and the second polyolefin resin are the main components of the flame-retardant adhesive film, and the total content of the first polyolefin resin and the second polyolefin resin exceeds 70 wt% based on the total weight of the resin composition (100 wt%). In one embodiment, the content of the second polyolefin resin is equal to or greater than the content of the first polyolefin resin.

[0033] [First polyolefin resin] The addition of the first polyolefin resin improves the flame retardant effect of the resin composition, and the first polyolefin resin contains 0.1 wt % to 1.0 wt % of phosphorus atoms.

[0034] Specifically, the first polyolefin resin contains a phosphorus-containing functional group, which provides the resin composition with a good flame retardant effect and improves the compatibility between the flame retardant compound and the second polyolefin resin.

[0035] The first polyolefin resin is obtained by reacting a phosphorus compound, a polyolefin, and a peroxide at a temperature of 160°C to 240°C. That is, the polyolefin is modified with the phosphorus compound to form the first polyolefin resin, thereby imparting flame retardancy to the first polyolefin resin. In other words, the first polyolefin resin is modified with a phosphorus-containing functional group.

[0036] The weight ratio of the phosphorus compound to the polyolefin is 1:10 to 1:100, which allows the first polyolefin resin to have a specific phosphorus atom content. The phosphorus compound can be a phosphoric acid ester, a phosphorus compound having a specific functional group, or a phosphorus oxide having a 9,10-dihydro-9-oxa-10-phospha-phenanthrene-10-oxide (DOPO) functional group, but the present invention is not limited thereto.

[0037] In one embodiment, the phosphorus compound can be a phosphate ester having a vinyl group, a phosphate ester having a biphenyl group, or a combination thereof. In another embodiment, the phosphorus compound simultaneously has a biphenyl group and a hydroxy group. In yet another embodiment, the phosphorus compound can be 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), 10-(2,5-dihydroxyphenyl)-10H-9-oxa-10-phosphaphenanthrene-10-oxide (ODOPB), or a combination thereof.

[0038] The polyolefin may be polyethylene, polypropylene, polybutene, or a combination thereof, or a polyolefin having an epoxy group at its terminal. More preferably, the polyolefin is polyethylene, polypropylene, or polybutene having an epoxy group at its terminal, although the invention is not limited thereto.

[0039] The peroxide can be di-isopropylbenzene peroxide (DCP), di-tert-butyl peroxide (DTBP), isopropylcumyl hydroperoxide (DBHP), or a combination thereof.

[0040] The content of the first polyolefin resin is 12 wt% to 55 wt% of the total weight of the resin composition (100 wt%), for example, 15 wt%, 20 wt%, 25 wt%, 30 wt%, 35 wt%, 40 wt%, 45 wt%, or 50 wt%.

[0041] [Second polyolefin resin] The second polyolefin resin includes an ethylene polymer and a propylene polymer, and additionally, since the ethylene polymer and the propylene polymer do not have a functional group containing phosphorus, the second polyolefin resin does not contain a phosphorus atom.

[0042] The texture of the flame-retardant adhesive film can be adjusted by adjusting the content of the ethylene polymer and the propylene polymer. In one embodiment, the content of the ethylene polymer is greater than the content of the propylene polymer, specifically, the weight ratio of the ethylene polymer to the propylene polymer is 1.1 to 9, more preferably, the weight ratio of the ethylene polymer to the propylene polymer is 1.5 to 8.5.

[0043] Furthermore, the hardness and processing temperature of the flame-retardant adhesive film can be adjusted by further adjusting the molecular weight of the ethylene polymer and the propylene polymer. In a more preferred embodiment, the ethylene polymer is linear low-density polyethylene (weight average molecular weight of 100,000 g / mol to 300,000 g / mol), and the propylene polymer is propylene homopolymer (weight average molecular weight of 200,000 g / mol to 300,000 g / mol), but the present invention is not limited thereto.

[0044] When the total weight of the resin composition is 100 wt%, the content of the second polyolefin resin is 20 wt% to 60 wt%, for example, the content of the second polyolefin resin can be 25 wt%, 30 wt%, 35 wt%, 40 wt%, 45 wt%, 50 wt%, or 55 wt%.

[0045] [Phosphorus compounds with spiro structures] The addition of a spiro-structured phosphorus compound improves the flame retardant properties of the flame-retardant adhesive film. Compared to triphenyl phosphate ester, the spiro-structured phosphorus compound has a higher phosphorus atom content in its structure, which allows it to achieve a better flame retardant effect.

[0046] In one embodiment, the phosphorus atom content of the spiro-structured phosphorus compound is 7 wt % to 15 wt %.

[0047] In one embodiment, the phosphorus compound has a spiro structure, and more preferably, the phosphorus compound having a spiro structure is bis(2,4-dichlorophenyl) P Pentaerythritol diphosphate, but the present invention is not limited thereto.

[0048] In one embodiment, the melting point of the spiro-structured phosphorus compound is 225°C to 246°C.

[0049] When the total weight of the resin composition is 100 wt%, the content of the phosphorus compound having a spiro structure is 3 wt% to 15 wt%, and for example, the content of the phosphorus compound having a spiro structure can be 4 wt%, 6 wt%, 8 wt%, 10 wt%, 12 wt%, or 14 wt%.

[0050] [Flame retardant compound] The flame retardant compound includes a phosphorus-based flame retardant. The flame retardant compound further includes at least one selected from the group consisting of a nitrogen-based flame retardant, a silicon-based flame retardant, a boron-based flame retardant, and a metal inorganic flame retardant. By adding multiple types of flame retardants, it is possible to achieve a better flame retardancy effect through multiple flame retardant mechanisms, which cannot be achieved by adding a single flame retardant, and among these, the phosphorus-based flame retardant contributes significantly.

[0051] In one embodiment, the amount of phosphorus-based flame retardant added is 20 wt% to 45 wt%, with the total weight of the flame retardant compound being 100 wt%, for example, the amount of phosphorus-based flame retardant added can be 25 wt%, 30 wt%, 35 wt%, or 40 wt%.

[0052] The phosphorus-based flame retardant may be formed from a phosphorus compound. To further improve the flame retardant properties of the phosphorus-based flame retardant, the phosphorus-based flame retardant may include a core layer and a surface layer surrounding the core layer. Specifically, the core layer may be formed from polymetaphosphoric acid, and the surface layer may be a carbon layer, but the present invention is not limited thereto.

[0053] In one embodiment, the method for producing the phosphorus-based flame retardant of the present invention includes first heating a phosphorus compound to form polymetaphosphoric acid, then reacting the polymetaphosphoric acid with a resin and dehydrating the resulting resin to form a carbon layer on the surface. Thus, the core layer of the phosphorus-based flame retardant is formed from polymetaphosphoric acid, and the surface layer is a carbon layer.

[0054] The carbon layer on the surface of phosphorus-based flame retardants is non-flammable, which blocks oxygen and prevents combustion. Furthermore, the carbon layer itself has low thermal conductivity, which effectively reduces the heat transfer from the flame to the substrate, reducing the rate of substrate loss and the amount of combustible material produced.

[0055] When heated, nitrogen-based flame retardants produce carbon dioxide, nitrogen, ammonia, and water vapor, diluting the oxygen concentration in the air. Furthermore, the gases can carry away some heat through convection, thereby slowing down the progression of combustion. For example, nitrogen-based flame retardants include, but are not limited to, melamine or its derivatives.

[0056] After combustion, the silicon-based flame retardant carbonizes to form a carbon layer. This carbon layer is non-flammable and blocks oxygen, preventing combustion. Furthermore, the carbon layer itself has low thermal conductivity, so it can effectively reduce the heat transfer from the flame to the substrate. For example, the silicon-based flame retardant can be silicon dioxide, silane, or a combination thereof, but is not limited to this invention.

[0057] Hou Basic The flame retardant mechanism of boron-based flame retardants is similar to that of silicon-based flame retardants; they carbonize after combustion and form a carbon layer. This carbon layer is non-flammable and also blocks oxygen, preventing combustion. Furthermore, the carbon layer itself has low thermal conductivity, so it can effectively reduce the heat transfer from the flame to the substrate. For example, boron-based flame retardants include borates and their combinations, but this invention is not limited to these.

[0058] The metal inorganic flame retardant contains water of crystallization and can release water vapor under high temperature, which helps to dilute the oxygen concentration in the air and slow down the progress of combustion. For example, the metal inorganic flame retardant is magnesium oxide, aluminum oxide, calcium carbonate, or a combination thereof, but is not limited to this invention.

[0059] Phosphorus-based flame retardants, nitrogen-based flame retardants, silicon-based flame retardants, boron BasicThe synergistic effect of the flame retardant and the metallic inorganic flame retardant can further improve the flame retardancy of the flame-retardant adhesive film.

[0060] The content of the flame retardant compound is 15 wt% to 30 wt%, where the total weight of the resin composition is 100 wt%, and for example, the content of the first polyolefin resin can be 17.5 wt%, 20 wt%, 22.5 wt%, 25 wt%, or 27.5 wt%.

[0061] Furthermore, the content of the phosphorus-based flame retardant is 3 wt% to 13 wt%, for example, 4 wt%, 6 wt%, 8 wt%, 10 wt%, or 12 wt%, based on the total weight of the resin composition as 100 wt%. The content of the nitrogen-based flame retardant is 3 wt% to 7 wt%, for example, 4 wt%, 5 wt%, or 6 wt%. The content of the silicon-based flame retardant is 1 wt% to 5 wt%, for example, 2 wt%, 3 wt%, or 4 wt%. Basic The content of the inorganic flame retardant is 1 wt% to 5 wt%, for example, 2 wt%, 3 wt%, or 4 wt%, and the content of the metal inorganic flame retardant is 1 wt% to 5 wt%, for example, 2 wt%, 3 wt%, or 4 wt%, but the present invention is not limited thereto.

[0062] [Experimental data] In order to prove that the flame-retardant adhesive film of the present invention has a flame-retardant effect, a resin composition was formulated using the above-mentioned components, and the resin composition was put into a coating machine to produce flame-retardant adhesive films of Experimental Examples 1 to 5 at processing temperatures of 170°C to 250°C.

[0063] In Experimental Examples 1 to 5, the specific amounts of the first polyolefin resin, the second polyolefin resin, the spiro-structured phosphorus compound, and the flame retardant compound are listed in Table 1. Here, the first polyolefin resin was synthesized from a phosphorus compound (a vinyl-containing phosphoric acid ester), a polyolefin (having a melting index of 1.5 to 3.0 grams / 10 minutes as measured according to ASTM D1238 standard), and a peroxide at a temperature of 160 to 240°C (the screw temperature was controlled at 170, 180, 210, 180, 170, and 160°C in sequence), and the weight ratio of the phosphorus compound to the polyolefin was 1:10 to 1:100. The second polyolefin resin includes a propylene homopolymer (number average molecular weight of 200,000 g / mol to 300,000 g / mol) and a linear low density polyethylene (number average molecular weight of 100,000 g / mol to 300,000 g / mol). The phosphorus compound having a spiro structure is bis(2,4-dichlorophenyl) P The phosphorus-based flame retardant is a mixture of phosphoric acid monoester and phosphoric acid diester with high activity characteristics, and the weight ratio of phosphoric acid monoester to phosphoric acid diester is 1:2 to 1:5. The nitrogen-based flame retardant is melamine. The silicon-based flame retardant is silicon dioxide with a particle size of 10 μm to 50 μm. Boron Basic The flame retardant is a borate. The metallic inorganic flame retardant is aluminum oxide.

[0064] The flame retardant adhesive films of Experimental Examples 1 to 5 were subjected to flame retardant effect tests in accordance with the standard test method of UL94V™, and the test results are shown in Table 2.

[0065] According to the UL94VTM standard test method, a flame retardancy rating of "VTM-0" means that the self-ignition time of each sample is 10 seconds or less. The total self-ignition time of five samples is 50 seconds or less, and when exposed to flame for the second time, the total self-ignition time and glow time of each sample is 30 seconds or less. The self-ignition and glow of the sample do not spread to the clamp, and the hanging sample does not ignite the cotton.

[0066] Flame retardant rating "VTM-1" means that the self-ignition time of each sample is 30 seconds or less. The total self-ignition time of five samples is 250 seconds or less, and when exposed to flame for the second time, the total self-ignition time and glow time of each sample is 60 seconds or less. The self-ignition and glow of the samples do not spread to the clamp, and the hanging samples do not ignite the cotton.

[0067] Flame retardant rating "VTM-2" means that the self-ignition time of each sample is 30 seconds or less. The total self-ignition time of the five samples is 250 seconds or less, and when exposed to flame for the second time, the total self-ignition time and glow time of each sample is 60 seconds or less. The self-ignition and glow of the samples do not spread to the clamp, and the hanging sample ignites the cotton.

[0068] Table 1 TIFF0007762755000001.tif119144

[0069] Table 2 TIFF0007762755000002.tif104145

[0070] The results in Tables 1 and 2 show that the flame retardant effect of the flame-retardant adhesive film can be improved by adding the first polyolefin resin, the second polyolefin resin, the spiro-structured phosphorus compound, and the flame retardant compound and controlling the amount of each component added. Therefore, the flame-retardant adhesive film of the present invention can replace the halogen-containing flame-retardant adhesive films currently on the market.

[0071] When the content of the first polyolefin resin in the resin composition is 20 wt% to 50 wt%, the flame-retardant adhesive film has good flame-retardant effect. Furthermore, the content of the first polyolefin resin can be adjusted according to the flame-retardant requirements.

[0072] The flame-retardant adhesive film 1 of the present invention is extremely low in toxicity, safe, and highly flame-retardant, and therefore can be used as a decorative film material that can be used for interior decoration materials, vehicle interiors, and the like.

[0073] As shown in Figure 2, the decorative film comprises the aforementioned flame-retardant adhesive film 1 and one pattern layer 2. The pattern layer 2 is placed on the flame-retardant adhesive film 1. The placement of the pattern layer 2 allows the decorative film to maintain its aesthetic effect. Because the decorative film uses the flame-retardant adhesive film 1, the decorative film containing the flame-retardant adhesive film 1 is also safe, with extremely low toxicity, and highly flame-retardant. [Beneficial Effects of the Embodiments]

[0074] One beneficial effect of the present invention is that the flame-retardant adhesive film and decorative film material provided by the present invention can improve the flame retardancy of the flame-retardant adhesive film through the technical solution that "the resin composition comprises a first polyolefin resin, a second polyolefin resin, a phosphorus compound with a spiro structure, and a flame retardant compound" and "the content of phosphorus atoms in the first polyolefin resin is 0.1 wt% to 1.0 wt%."

[0075] The contents disclosed above are merely preferred and possible embodiments of the present invention, and do not limit the scope of the claims of the present invention. Therefore, all equivalent technical modifications made based on the contents of the specification and accompanying drawings of the present invention are intended to be included in the scope of the claims of the present invention. [Explanation of symbols]

[0076] 1. Flame-retardant adhesive film 2. Decorative film materials

Claims

1. A flame-retardant adhesive film formed from a halogen-free resin composition, The resin composition comprises 12 wt % to 55 wt % of a first polyolefin resin having a phosphorus atom content of 0.1 wt % to 1.0 wt %; 20 wt % to 60 wt % of a second polyolefin resin comprising an ethylene polymer and a propylene polymer; 3 wt % to 15 wt % of a phosphorus compound having a spiro structure; Flame retardant compound 15wt% to 30wt%; Including, The flame retardant compound contains a phosphorus-based flame retardant, and the flame retardant compound further contains at least one selected from the group consisting of a nitrogen-based flame retardant, a silicon-based flame retardant, a boron-based flame retardant, and a metal inorganic flame retardant. A flame-retardant adhesive film.

2. 2. The flame-retardant adhesive film according to claim 1, wherein the first polyolefin resin is obtained by reacting a phosphorus compound with a polyolefin, and the weight ratio of the phosphorus compound to the polyolefin is from 1:10 to 1:

100.

3. The flame-retardant adhesive film according to claim 2 , wherein the phosphorus compound is selected from the group consisting of a phosphate ester having a vinyl group and a phosphate ester having a biphenyl group.

4. The flame-retardant adhesive film according to claim 2 , wherein the phosphorus compound is a phosphorus compound having a biphenyl group and a hydroxy group.

5. 3. The flame-retardant adhesive film according to claim 2, wherein the phosphorus compound is selected from the group consisting of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and 10-(2,5-dihydroxyphenyl)-10H-9-oxa-10-phosphaphenanthrene-10-oxide.

6. 3. The flame-retardant adhesive film according to claim 2, wherein the polyolefin is selected from the group consisting of polyethylene, polypropylene, and polybutene.

7. The flame-retardant adhesive film according to claim 2 , wherein the polyolefin has an epoxy group at its end.

8. 2. The flame-retardant adhesive film according to claim 1, wherein the first polyolefin resin has a functional group selected from the group consisting of a vinyl group and a biphenyl group.

9. The flame-retardant adhesive film according to claim 1 , wherein the phosphorus atom content of the phosphorus compound having a spiro structure is 7 wt % to 15 wt %.

10. The flame-retardant adhesive film according to claim 1, wherein the phosphorus compound having a spiro structure is bis(2,4-dichlorophenyl)pentaerythritol diphosphate.

11. The flame-retardant adhesive film according to claim 1 , wherein the phosphorus-based flame retardant comprises a core layer and a surface layer covering the core layer, and the surface layer is a carbon layer.

12. The flame-retardant adhesive film according to claim 11 , wherein the core layer is formed from polymetaphosphoric acid.

13. 2. The flame-retardant adhesive film according to claim 1, wherein the nitrogen-based flame retardant is melamine or a derivative thereof.

14. 2. The flame-retardant adhesive film according to claim 1, wherein the silicon-based flame retardant is silicon dioxide or a silane.

15. The flame-retardant adhesive film according to claim 1 , wherein the boron-based flame retardant is a borate.

16. 2. The flame-retardant adhesive film according to claim 1, wherein the metallic inorganic flame retardant is selected from the group consisting of magnesium oxide, aluminum oxide, and calcium carbonate.

17. The density of the flame-retardant adhesive film is 0.9 g / cm 3 to 1.3 g / cm 3 The flame-retardant adhesive film according to claim 1 ,

18. The flame-retardant adhesive film according to claim 1, wherein the phosphorus atom content of the entire flame-retardant adhesive film is 1.25 wt% to 2.0 wt%.

19. The flame-retardant adhesive film according to any one of claims 1 to 18, A pattern layer disposed on the flame-retardant adhesive film; Equipped with A decorative film material characterized by:

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