Flame-retardant adhesive film and decorative film material

Abstract

The invention discloses a flame-retardant adhesive film and a decorative film material. The flame-retardant adhesive film is formed by a resin composition, and the resin composition does not contain halogen. The resin composition includes 12 to 55 weight percent of a first polyolefin resin, 20 to 60 weight percent of a second polyolefin resin, 3 to 15 weight percent of a phosphorus compound having a cage structure, and 15 to 30 weight percent of a flame retardant compound. The content of phosphorus atoms in the first polyolefin resin is 0.1 wt% to 1.0 wt%. The second polyolefin resin includes an ethylene polymer and a propylene polymer. The flame-retardant compound comprises a phosphorus-based flame retardant, and further comprises a group consisting of a nitrogen-based flame retardant, a silicon-based flame retardant, a boron-based flame retardant and a metal inorganic flame retardant.

Description

Technical Field

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

[0002] Most of the existing flame-retardant adhesive films add halogen-containing flame retardants to polyolefin resins. Although halogen-containing flame retardants have good flame-retardant effects, they will produce toxic gases and thick smoke when burned, which will cause harm to the human body and the environment. Therefore, such materials cannot be used in interior building materials. Moreover, in the context of the rising awareness of environmental protection, all parties are committed to researching and replacing such materials.

[0003] Therefore, how to improve the material composition to replace the existing halogen-containing flame retardants and enhance the flame-retardant effect of polyolefin resins has become one of the important issues to be solved in this field. Summary of the Invention

[0004] The technical problem to be solved by the present application is to provide a flame-retardant adhesive film and a decorative film material in view of the deficiencies of the prior art.

[0005] To solve the above technical problem, one of the technical solutions adopted by the present application is to provide a flame-retardant adhesive film. The flame-retardant adhesive film is formed by a resin composition. The resin composition does not contain halogen. The resin composition includes 12% to 55% by weight of a first polyolefin resin, 20% to 60% by weight of a second polyolefin resin, 3% to 15% by weight of a phosphorus compound with a cage (spiro) structure, and 15% to 30% by weight of a flame-retardant compound. The phosphorus atom content in the first polyolefin resin is 0.1% to 1.0% by weight. The second polyolefin resin includes an ethylene polymer and a propylene polymer. The flame-retardant compound includes a phosphorus-based flame retardant and further includes a group selected from nitrogen-based flame retardants, silicon-based flame retardants, boron-based flame retardants, and metal inorganic flame retardants.

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

[0007] Furthermore, the phosphorus-containing compound is selected from the group consisting of vinyl phosphate and biphenyl phosphate.

[0008] Furthermore, the phosphorus-containing compound is a phosphorus-containing compound with biphenyl and hydroxyl groups.

[0009] Further, the phosphorus-containing 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.

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

[0011] Further, the end of the polyolefin has an epoxy group.

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

[0013] Further, the phosphorus atom content of the phosphorus compound with a cage structure is 7 wt% to 15 wt%.

[0014] Further, the phosphorus compound with a cage structure is bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite.

[0015] Further, the phosphorus-based flame retardant includes a surface layer with a core layer and a cladding layer, and the surface layer is a carbonized layer.

[0016] Further, the core layer is formed of poly metaphosphoric acid.

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

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

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

[0020] Further, the metal inorganic flame retardant is selected from the group consisting of magnesium hydroxide, aluminum hydroxide, and calcium carbonate.

[0021] Further, the density of the flame retardant adhesive film is 0.9 g / cm³ to 1.3 g / cm³.

[0022] Further, the overall phosphorus atom content of the flame retardant adhesive film is 1.25 wt% to 2.0 wt%.

[0023] To solve the above technical problems, another technical solution adopted by this application is to provide a decorative film material. The decorative film material includes the aforementioned flame retardant adhesive film and a pattern layer provided on the flame retardant adhesive film.

[0024] One of the beneficial effects of the present application is that the flame-retardant adhesive film and decorative film provided by the present application can improve the flame retardancy of the flame-retardant adhesive film through the technical solutions of "the resin composition includes a first polyolefin resin, a second polyolefin resin, a phosphorus compound with a cage structure, and a flame-retardant compound" and "the phosphorus atom content in the first polyolefin resin is 0.1 wt% to 1.0 wt%".

[0025] To further understand the features and technical content of the present application, please refer to the following detailed description and drawings of the present application. However, the provided drawings are only for reference and illustration, and are not used to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a side view schematic diagram of the flame-retardant adhesive film of the present application.

[0027] Figure 2 It is a side view schematic diagram of the decorative film of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following are specific examples to illustrate the embodiments of the "flame-retardant adhesive film and decorative film" disclosed in the present application. Those skilled in the art can understand the advantages and effects of the present application from the content disclosed in this specification. The present application can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present application. Additionally, the drawings of the present application are only for simple schematic illustration and are not drawn according to actual dimensions, hereby declared in advance. The following embodiments will further detail the related technical content of the present application, but the disclosed content is not used to limit the protection scope of the present application. In addition, the term "or" used herein may include any one or a combination of more of the related listed items depending on the actual situation.

[0029] In order to overcome the problem that toxic gases and thick smoke are generated during combustion derived from the use of halogen-containing flame retardants, the present application provides a flame-retardant adhesive film and a decorative film. The halogen-containing flame retardant is not used in the flame-retardant adhesive film and decorative film of the present application, but it still has good flame retardant effects.

[0030] The present application uses special flame-retardant additives and combines them with specific polyolefin materials to form a resin composition by mixing. The resin composition can be made into a flame-retardant adhesive film with good flame retardant properties through a tape machine, and can further be made into a decorative film with good flame retardant properties, so as to balance the effects of indoor beauty and safety, and can replace the existing halogen-containing flame-retardant adhesive film.

[0031] Please refer to Figure 1As shown, the flame-retardant adhesive film 1 of the present application is made from a resin composition by a tape-making machine. In a demonstration embodiment, the thickness of the flame-retardant adhesive film 1 can be from 0.25 mm to 0.75 mm, but the present application is not limited thereto.

[0032] The resin composition of the present application does not contain halogen. Based on the total weight of the resin composition being 100 weight percent, the resin composition includes 12 weight percent to 55 weight percent of a first polyolefin resin, 20 weight percent to 60 weight percent of a second polyolefin resin, 3 weight percent to 15 weight percent of a phosphorus compound with a cage-like (spiro) structure, and 15 weight percent to 30 weight percent of a flame-retardant compound.

[0033] The first polyolefin resin, the phosphorus compound with a cage-like structure, and the flame-retardant compound all contain phosphorus atoms. Under the synergistic action of the first polyolefin resin, the phosphorus compound with a cage-like structure, and the flame-retardant compound, the flame-retardant adhesive film can have a better flame-retardant effect. Specifically, based on the total weight of the overall flame-retardant adhesive film (100 weight percent), the content of phosphorus atoms in the flame-retardant adhesive film is 1.25 weight percent to 2.0 weight percent, but the present application is not limited thereto.

[0034] The first polyolefin resin and the second polyolefin resin are the main components constituting the flame-retardant adhesive film. Based on the total weight of the resin composition being 100 weight percent, the total content of the first polyolefin resin and the second polyolefin resin is greater than 70 weight percent. In a demonstration embodiment, the content of the second polyolefin resin is greater than or equal to the content of the first polyolefin resin.

[0035] [First polyolefin resin]

[0036] The addition of the first polyolefin resin can improve the flame-retardant effect of the resin composition. The first polyolefin resin contains 0.1 weight percent to 1.0 weight percent of phosphorus atoms.

[0037] Specifically, the first polyolefin resin has a phosphorus-containing functional group. The phosphorus-containing functional group can make the resin composition have a good flame-retardant effect and can also improve the compatibility between the flame-retardant composite and the second polyolefin resin.

[0038] The first polyolefin resin is obtained by reacting a phosphorus-containing compound, a polyolefin, and a peroxide at a temperature of 160°C to 240°C. That is to say, the polyolefin is modified by the phosphorus-containing compound to form the first polyolefin resin, so that the first polyolefin resin has a flame-retardant effect. In other words, the first polyolefin resin is modified with a phosphorus-containing functional group.

[0039] The weight ratio of the phosphorus-containing compound to the polyolefin is from 1:10 to 1:100 so that the first polyolefin resin has a specific content of phosphorus atoms. The phosphorus-containing compound can be a phosphate ester, a phosphorus-containing compound with specific functional groups, or a phosphorus-containing oxide containing 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) functional groups, but the present application is not limited thereto.

[0040] In an exemplary embodiment, the phosphorus-containing compound can be a vinyl phosphate ester, a biphenyl phosphate ester, or a combination thereof. In another exemplary embodiment, the phosphorus-containing compound has both a biphenyl group and a hydroxyl group. In yet another exemplary embodiment, the phosphorus-containing compound can be 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, DOPO), 10-(2,5-dihydroxyphenyl)-10H-9-oxa-10-phosphaphenanthrene-10-oxide (10-(2,5-dihydroxyphenyl)-10H-9-oxa-10-phosphaphenanthrene-10-oxide, ODOPB), or a combination thereof.

[0041] The polyolefin can be polyethylene, polypropylene, polybutene, or a combination thereof, or a polyolefin having an epoxy group at the end. Preferably, the polyolefin is polyethylene, polypropylene, or polybutene having an epoxy group at the end, but the present application is not limited thereto.

[0042] The peroxide can be dicumyl peroxide (DCP), di-tert-butyl peroxide (DTBP), isopropylcumyl hydroperoxide (DBHP), or a combination thereof.

[0043] Based on the total weight of the resin composition being 100 weight percent, the content of the first polyolefin resin is from 12 weight percent to 55 weight percent. For example, the content of the first polyolefin resin can be 15 weight percent, 20 weight percent, 25 weight percent, 30 weight percent, 35 weight percent, 40 weight percent, 45 weight percent, or 50 weight percent.

[0044] [Second polyolefin resin]

[0045] The second polyolefin resin includes an ethylene polymer and a propylene polymer. Additionally, the ethylene polymer and the propylene polymer do not have phosphorus-containing functional groups. Therefore, the second polyolefin resin does not contain phosphorus atoms.

[0046] By adjusting the contents of the ethylene polymer and the propylene polymer, the texture of the flame retardant film can be adjusted. In a demonstration embodiment, the content of the ethylene polymer is greater than that of the propylene polymer. Specifically, the weight ratio of the ethylene polymer to the propylene polymer is from 1.1 to 9. Preferably, the weight ratio of the ethylene polymer to the propylene polymer is from 1.5 to 8.5.

[0047] In addition, by further adjusting the molecular weights of the ethylene polymer and the propylene polymer, the hardness and processing temperature of the flame retardant film can be adjusted. In a preferred embodiment, the ethylene polymer is linear low density polyethylene (weight average molecular weight is from 100,000 g / mol to 300,000 g / mol), and the propylene polymer is propylene homopolymer (weight average molecular weight is from 200,000 g / mol to 300,000 g / mol), but the present application is not limited thereto.

[0048] Based on the total weight of the resin composition being 100 weight percentages, the content of the second polyolefin resin is from 20 weight percentages to 60 weight percentages. For example, the content of the second polyolefin resin can be 25 weight percentages, 30 weight percentages, 35 weight percentages, 40 weight percentages, 45 weight percentages, 50 weight percentages or 55 weight percentages.

[0049] [Phosphorus compound with a cage structure]

[0050] The addition of the phosphorus compound with a cage structure can enhance the flame retardant property of the flame retardant film. Compared with triphenyl phosphate, the phosphorus compound with a cage structure has a higher phosphorus atom content due to its structure, and thus can achieve a better flame retardant effect.

[0051] In a demonstration embodiment, the phosphorus atom content of the phosphorus compound with a cage structure is from 7 weight percentages to 15 weight percentages.

[0052] In a demonstration embodiment, the phosphorus compound has a cage (spiro) structure. Preferably, the phosphorus compound with a cage structure can be bis(2,4 - di - tert - butylphenyl)pentaerythritol diphosphite, but the present application is not limited thereto.

[0053] In a demonstration embodiment, the melting point of the phosphorus compound with a cage structure is from 225 °C to 246 °C.

[0054] Based on the total weight of the resin composition being 100 weight percentages, the content of the phosphorus compound with a cage structure is from 3 weight percentages to 15 weight percentages. For example, the content of the phosphorus compound with a cage structure can be 4 weight percentages, 6 weight percentages, 8 weight percentages, 10 weight percentages, 12 weight percentages or 14 weight percentages.

[0055] [Flame retardant compound]

[0056] The flame retardant compound includes a phosphorus flame retardant, and further includes a flame retardant selected from the group consisting of a nitrogen flame retardant, a silicon flame retardant, a boron flame retardant, and a metal inorganic flame retardant. Since more than one flame retardant is added, a better flame retardant effect can be achieved through multiple flame retardant mechanisms, which cannot be achieved by adding a single flame retardant, and the phosphorus flame retardant contributes the most.

[0057] In an exemplary embodiment, the total weight of the flame retardant compound is 100 parts by weight, and the amount of the phosphorus-based flame retardant added is 20 parts by weight to 45 parts by weight. For example, the amount of the phosphorus-based flame retardant added is 25 parts by weight, 30 parts by weight, 35 parts by weight, or 40 parts by weight.

[0058] The phosphorus-based flame retardant may be formed of a phosphorus compound. In order to further enhance the flame retardant properties of the phosphorus-based flame retardant, the phosphorus-based flame retardant includes a core layer and a surface layer covering the core layer. Specifically, the core layer is formed of polymetaphosphoric acid, and the surface layer is a carbonized layer, but the present application is not limited thereto.

[0059] In one exemplary embodiment, the preparation method of the phosphorus-based flame retardant of the present application includes: first heating the phosphorus compound to form polymetaphosphoric acid, then reacting the polymetaphosphoric acid with a resin to dehydrate, and forming a carbonized layer on the surface. Therefore, the core layer of the phosphorus-based flame retardant is formed by polymetaphosphoric acid, and the surface layer is a carbonized layer.

[0060] The carbonized layer on the surface of phosphorus-based flame retardants is non-flammable, so it can block oxygen and prevent combustion. In addition, the carbonized layer itself has poor thermal conductivity, which can effectively reduce the heat transferred from the flame to the substrate, thereby reducing the loss rate of the substrate and the amount of combustibles generated.

[0061] When heated, the nitrogen flame retardant will produce carbon dioxide, nitrogen, ammonia and water vapor, which can dilute the concentration of oxygen in the air. In addition, the gas will take away part of the heat during convection, thereby slowing down the combustion. For example, the nitrogen flame retardant can be melamine or its derivatives, but the present application is not limited thereto.

[0062] After burning, the silicon-based flame retardant will carbonize to form a carbonized layer. The carbonized layer is non-flammable and can also block oxygen and prevent combustion. In addition, the carbonized layer itself has poor thermal conductivity, which can effectively reduce the heat transferred from the flame to the substrate. For example, the silicon-based flame retardant can be silicon dioxide, siloxane or a combination thereof, but the present application is not limited thereto.

[0063] The flame retardant mechanism of the boron flame retardant is similar to that of the silicon flame retardant. The boron flame retardant will carbonize after burning to form a carbonized layer. The carbonized layer is non-flammable and can also block oxygen and prevent combustion. In addition, the carbonized layer itself has poor thermal conductivity, which can effectively reduce the heat transferred from the flame to the substrate. For example, the boron flame retardant can be a borate or a combination thereof, but the present application is not limited thereto.

[0064] The metal inorganic flame retardant contains crystal water and will release water vapor in a high-temperature environment, which can not only dilute the concentration of oxygen in the air but also help slow down the combustion process. For example, the metal inorganic flame retardant can be magnesium hydroxide, aluminum hydroxide, calcium carbonate, or a combination thereof, but the present application is not limited thereto.

[0065] Through the synergistic effect of the phosphorus-based flame retardant, nitrogen-based flame retardant, silicon-based flame retardant, boron-based flame retardant, and metal inorganic flame retardant, the flame retardant effect of the flame retardant adhesive film can be further improved.

[0066] Based on the total weight of the resin composition being 100 weight percent, the content of the flame retardant compound is 15 weight percent to 30 weight percent. For example, the content of the first polyolefin resin can be 17.5 weight percent, 20 weight percent, 22.5 weight percent, 25 weight percent, or 27.5 weight percent.

[0067] Furthermore, based on the total weight of the resin composition being 100 weight percent, the content of the phosphorus-based flame retardant is 3 weight percent to 13 weight percent, such as 4 weight percent, 6 weight percent, 8 weight percent, 10 weight percent, or 12 weight percent. The content of the nitrogen-based flame retardant is 3 weight percent to 7 weight percent, such as 4 weight percent, 5 weight percent, or 6 weight percent. The content of the silicon-based flame retardant is 1 weight percent to 5 weight percent, such as 2 weight percent, 3 weight percent, or 4 weight percent. The content of the boron-based flame retardant is 1 weight percent to 5 weight percent, such as 2 weight percent, 3 weight percent, or 4 weight percent. The content of the metal inorganic flame retardant is 1 weight percent to 5 weight percent, such as 2 weight percent, 3 weight percent, or 4 weight percent. However, the present application is not limited thereto.

[0068] [Experimental data]

[0069] To confirm that the flame retardant adhesive film of the present application has a flame retardant effect, a resin composition is prepared according to the above components, and then the resin composition is put into a tape machine to form the flame retardant adhesive films of Test Examples 1 to 5 at a processing temperature of 170°C to 250°C.

[0070] In Test Examples 1 to 5, the specific addition amounts of the first polyolefin resin, the second polyolefin resin, the phosphorus compound with a cage (spiro) structure, and the flame retardant compound are listed in Table 1. Among them, the first polyolefin resin is synthesized from a phosphorus-containing compound (vinyl phosphate), a polyolefin (the melt index measured according to ASTM D1238 standard is 1.5 g / 10 min to 3.0 g / 10 min), and a peroxide at a temperature of 160°C to 240°C (the screw temperature is sequentially controlled at 170°C, 180°C, 210°C, 180°C, 170°C, 160°C), and the weight ratio of the phosphorus-containing compound to the polyolefin is 1:10 to 1:100. The second polyolefin resin includes a propylene homopolymer (number average molecular weight is 200,000 g / mol to 300,000 g / mol) and a linear low-density polyethylene (number average molecular weight is 100,000 g / mol to 300,000 g / mol). The phosphorus compound with a cage structure is bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite. The phosphorus-based flame retardant is a mixture of a phosphoric acid monoester and a phosphoric acid diester, which has the characteristic of high activity, and the weight ratio of the phosphoric acid monoester to the phosphoric acid diester is 1:2 to 1:5. The nitrogen-based flame retardant is melamine. The silicon-based flame retardant is silica with a particle size of 10 μm to 50 μm. The boron-based flame retardant is borate. The metal inorganic flame retardant is aluminum hydroxide.

[0071] Moreover, the flame retardant effect of the flame retardant adhesive films of Test Examples 1 to 5 was tested according to the standard test method of UL94VTM, and the test results are listed in Table 2.

[0072] According to the standard test method of UL94VTM, the flame retardant grade "VTM-0" means that the self-ignition time of each sample is less than or equal to 10 seconds. The total self-ignition time of five samples is less than or equal to 50 seconds. After the second flame application, the total of the self-ignition time and the glowing time of each sample is less than or equal to 30 seconds. The self-ignition or glowing of the sample will not extend to the fixture, and the drooping sample will not ignite the cotton.

[0073] The flame retardant grade "VTM-1" means that the self-ignition time of each sample is less than or equal to 30 seconds. The total self-ignition time of five samples is less than or equal to 250 seconds. After the second flame application, the total of the self-ignition time and the glowing time of each sample is less than or equal to 60 seconds. The self-ignition or glowing of the sample will not extend to the fixture, and the drooping sample will not ignite the cotton.

[0074] The flame retardant grade "VTM-2" means that the self-ignition time of each sample is less than or equal to 30 seconds. The total self-ignition time of five samples is less than or equal to 250 seconds. After the second flame application, the total of the self-ignition time and the glowing time of each sample is less than or equal to 60 seconds. The self-ignition or glowing of the sample will not extend to the fixture, and the drooping sample will ignite the cotton.

[0075] Table 1

[0076]

[0077] Table 2

[0078]

[0079] From the results of Table 1 and Table 2, it can be known that by adding the first polyolefin resin, the second polyolefin resin, the phosphorus compound with a cage structure, and the flame retardant compound, and controlling the addition amounts of each component, the flame retardant effect of the flame retardant film can be improved. Therefore, the flame retardant film of the present application can replace the halogen-containing flame retardant film currently on the market.

[0080] In the resin composition, when the content of the first polyolefin resin is 20% by weight to 50% by weight, the flame retardant film can have a good flame retardant effect. In addition, the content of the first polyolefin resin can be adjusted according to the flame retardant requirements.

[0081] The flame retardant film 1 of the present application has the effects of being safe, non-toxic and highly flame retardant, so it can be used in interior decoration materials or vehicle interiors as a decorative film material.

[0082] Please refer to Figure 2 As shown, the decorative film material includes the aforementioned flame retardant film 1 and a pattern layer 2, and the pattern layer 2 is disposed on the flame retardant film 1. The setting of the pattern layer 2 can make the decorative film material maintain a beautiful effect. Since the decorative film material uses the flame retardant film 1, therefore, the decorative film material including the flame retardant film 1 also has the effects of being safe, non-toxic and highly flame retardant.

[0083] [Advantages of the Embodiment]

[0084] One of the advantages of the present application is that the flame retardant film and the decorative film material provided by the present application can improve the flame retardancy of the flame retardant film through the technical solutions of "the resin composition includes the first polyolefin resin, the second polyolefin resin, the phosphorus compound with a cage structure, and the flame retardant compound" and "the phosphorus atom content in the first polyolefin resin is 0.1% by weight to 1.0% by weight".

[0085] The content disclosed above is only the preferred feasible embodiment of the present application, and does not limit the protection scope of the claims of the present application. Therefore, all equivalent technical changes made by using the content of the specification and drawings of the present application are included in the protection scope of the claims of the present application.

Claims

1. A flame retardant film, characterized in that: The flame retardant adhesive film is formed by a resin composition, the resin composition does not contain halogen, and the resin composition includes: 12 to 55 weight percent of a first polyolefin resin, wherein the phosphorus atom content of the first polyolefin resin is 0.1 to 1.0 weight percent; 20 to 60 weight percent of a second polyolefin resin, wherein the second polyolefin resin comprises an ethylene polymer and a propylene polymer; 3 to 15 weight percent of a phosphorus compound having a spiro structure; and 15 to 30 weight percent of a flame retardant compound, wherein the flame retardant compound comprises a phosphorus-based flame retardant and further comprises a flame retardant 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.

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

100.

3. The flame retardant adhesive film according to claim 2, characterized in that: The phosphorus-containing compound is selected from the group consisting of phosphoric acid esters having vinyl groups and phosphoric acid esters having biphenyl groups.

4. The flame retardant adhesive film according to claim 2, characterized in that: The phosphorus-containing compound is a phosphorus-containing compound having a biphenyl group and a hydroxyl group.

5. The flame retardant adhesive film according to claim 2, characterized in that: The phosphorus-containing compound is selected from the group consisting of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and 10-(2,5-dihydroxyphenyl)-10-hydrogen-9-oxa-10-phosphaphenanthrene-10-oxide.

6. The flame retardant adhesive film according to claim 2, characterized in that: The polyolefin is selected from the group consisting of polyethylene, polypropylene and polybutylene.

7. The flame retardant adhesive film according to claim 2, characterized in that: The polyolefin has an epoxy group at the terminal.

8. The flame retardant adhesive film according to claim 1, characterized in that: The first polyolefin resin has a functional group selected from the group consisting of vinyl and biphenyl.

9. The flame retardant adhesive film according to claim 1, characterized in that: The phosphorus compound with a cage-like structure has a phosphorus atom content of 7 weight percent to 15 weight percent.

10. The flame retardant adhesive film according to claim 1, characterized in that: The phosphorus compound with a cage-like structure is bis(2,4-dicumylphenyl)pentaerythritol diphosphite.

11. The flame retardant adhesive film according to claim 1, characterized in that: The phosphorus-based flame retardant comprises a core layer and a surface layer covering the core layer, and the surface layer is a carbonized layer.

12. The flame retardant adhesive film according to claim 11, characterized in that: The core layer is formed of polymetaphosphoric acid.

13. The flame retardant adhesive film according to claim 1, characterized in that: The nitrogen-based flame retardant is melamine or its derivatives.

14. The flame retardant adhesive film according to claim 1, characterized in that: The silicon-based flame retardant is silicon dioxide or siloxane.

15. The flame retardant adhesive film according to claim 1, characterized in that: The boron flame retardant is a borate.

16. The flame retardant adhesive film according to claim 1, characterized in that: The metal inorganic flame retardant is selected from the group consisting of magnesium hydroxide, aluminum hydroxide and calcium carbonate.

17. The flame retardant adhesive film according to claim 1, characterized in that: The density of the flame retardant film is 0.9 g / cm3 to 1.3 g / cm3.

18. The flame retardant adhesive film according to claim 1, characterized in that: The overall phosphorus atom content of the flame retardant film is 1.25 weight percent to 2.0 weight percent.

19. A decorative film material, characterized in that: The decorative film material comprises: The flame retardant adhesive film according to any one of claims 1 to 18; and A pattern layer is disposed on the flame retardant adhesive film.

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