Long-acting flame-retardant aluminized air bubble film as well as preparation method and application thereof

Abstract

The invention relates to the technical field of flame-retardant thermal insulation material preparation, in particular to a long-acting flame-retardant aluminized air bubble film and a preparation method and application thereof. The invention provides a long-acting flame-retardant aluminized air bubble film which comprises at least one air bubble layer and aluminized films wrapping the upper surface and the lower surface of the air bubble layer, every two adjacent air bubble layers are bonded through a bonding layer, and the air bubble layers and the aluminized films are bonded through bonding layers; the bubble layer comprises bubbles and microbubbles, and the bonding layer comprises microbubbles; the microbubbles are formed by phosphatized polymerization particles, and the phosphatized polymerization particles comprise grafted thermal expansion foaming particles and phosphatized ZIF67 wrapping the surfaces of the grafted thermal expansion foaming particles. Micro-bubble structures are introduced into the bubble layer and the bonding layer to reduce heat conduction paths, bubble structures in the long-acting flame-retardant aluminum-plated bubble film are rich by combining bubble structures generated by plastic uptake, and the long-term heat preservation capacity of the long-acting flame-retardant aluminum-plated bubble film is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of the preparation of flame-retardant thermal insulation materials, and particularly relates to a long-lasting flame-retardant aluminized bubble film, a preparation method thereof and an application thereof. Background Art

[0002] The structure of the existing aluminized bubble film is aluminized film, adhesive layer, bubble layer, adhesive layer, bubble layer, adhesive layer and aluminized film. Among them, there are a large number of large bubbles generated by thermoforming in the bubble layer. The hollow isolation effect of the bubbles can achieve a certain heat preservation effect, but its heat preservation effect will decrease significantly with the passage of time.

[0003] It cannot meet the use of aluminized bubble film in some application scenarios with relatively high requirements for heat preservation performance. In addition, during the application process, in order to improve application safety, materials usually need to have flame-retardant and fire-proof characteristics. The aluminized film in the aluminized bubble film itself has a certain fire-retardant property, but when the fire spreads or is relatively serious, its flame-retardant property cannot meet the use in these scenarios.

[0004] Therefore, how to improve the heat preservation effect and flame-retardant effect of the existing aluminized bubble film is a key problem that needs to be solved. Summary of the Invention

[0005] The present invention provides a long-lasting flame-retardant aluminized bubble film, a preparation method thereof and an application thereof. The long-lasting flame-retardant aluminized bubble film has both flame-retardant and heat-insulating dual properties. By incorporating nano-scale bubble particles into the aluminized bubble film using polymer particles, the heat conduction path is reduced, and the heat preservation effect of the aluminized bubble film is greatly improved, and its heat preservation time can be extended.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a long-lasting flame-retardant aluminized bubble film, which includes at least one bubble layer and aluminized films covering the upper and lower surfaces of the bubble layer. Adjacent two bubble layers are bonded by an adhesive layer, and the bubble layer and the aluminized film are bonded by an adhesive layer;

[0008] The bubble layer contains bubbles and micro-bubbles, and the adhesive layer contains micro-bubbles; the micro-bubbles are formed by phosphated polymer particles, and the phosphated polymer particles include grafted thermally expandable foaming particles and ZIF67 phosphide wrapped on the surface thereof.

[0009] The aluminized bubble film of the present invention adopts a multi-layer structure design, including an aluminized film, an adhesive layer, a bubble layer, an adhesive layer and an aluminized film stacked in sequence. Among them, the bubble layer can be more than one layer. When there are two bubble layers, the structure is an aluminized film, an adhesive layer, a bubble layer, an adhesive layer, a bubble layer, an adhesive layer and an aluminized film stacked in sequence, and its performance is better. The design of these layers aims to provide the best heat insulation performance and heat preservation effect.

[0010] The design of the bubble layer and the adhesive layer containing phosphated polymer particles aims to minimize heat conduction and provide better heat insulation. The microbubbles formed by the phosphated polymer particles can help reduce the heat conduction path on the basis of the bubbles generated by thermoforming, thereby improving the heat preservation performance. Among them, phosphated ZIF67 can play a flame retardant role, and its porous structure can help adsorb a large amount of flue gas that may be generated during the high-temperature process, which is green and environmentally friendly.

[0011] The aluminized films on the outermost two layers can effectively reflect heat radiation back, improve the heat insulation effect, prevent the migration of the base small molecule fillers at the same time, protect the aluminized bubble film from damage, and can effectively extend the service life of the aluminized bubble film.

[0012] Preferably, the volume ratio of the microbubbles in the adhesive layer is 5-20%; the volume ratio of the bubbles in the bubble layer is 80-95%, and the volume ratio of the microbubbles is 0.25-2%.

[0013] Preferably, the particle size of the phosphated ZIF67 is 20-200 nm.

[0014] Preferably, the particle size of the grafted thermally expandable foaming particles is 2-5 μm.

[0015] Preferably, the bubble layer contains bubbles, microbubbles and polyethylene, and the adhesive layer contains microbubbles and polyethylene.

[0016] There is a chelation and hydrogen bond binding effect between polyethylene and polymer particles, which can achieve the anchoring of polyethylene, and then help the polymer particles to disperse better in polyethylene, which is beneficial to the formation of a regular microbubble structure.

[0017] Preferably, the polyethylene is low-density polyethylene.

[0018] Preferably, the polyethylene is graft-modified polyethylene.

[0019] Preferably, the graft modification includes: using ammonium persulfate as an initiator, controlling the reaction temperature at 95-120 °C, and graft-modifying polyethylene with acrylic acid or maleic anhydride.

[0020] Preferably, the preparation of the phosphated polymer particles includes: putting grafted thermally expandable foaming particles into a cobalt salt solution, adding an organic ligand, stirring in an organic solvent to obtain a precursor, and then phosphating the precursor in a phosphorus-containing solution to obtain phosphated polymer particles. Preferably, the cobalt salt is at least one of cobalt nitrate, cobalt sulfate, cobalt chloride, and cobalt acetate.

[0021] Preferably, the organic ligand is 2-methylimidazole and / or 2-(aminomethyl)imidazole.

[0022] Preferably, the organic solvent is at least one of methanol, ethanol, and N,N-dimethylformamide.

[0023] Preferably, the molar ratio between cobalt in the cobalt salt and the organic ligand is 1:(3 - 5).

[0024] Preferably, the stirring time is 2 - 8 h.

[0025] Preferably, the stirring speed is 200 - 500 rpm.

[0026] Preferably, the phosphorus-containing solution is a hypophosphite solution. More preferably, the phosphorus-containing solution is 2 wt% sodium hypophosphite.

[0027] Preferably, stirring at 200 - 500 rpm for at least 30 min to complete phosphating.

[0028] Preferably, the preparation of the grafted thermally expandable foamed particles includes: using ammonium persulfate as an initiator, controlling the reaction temperature at 95 - 120 °C, and graft-modifying the thermally expandable foamed particles with acrylic acid or maleic anhydride.

[0029] Preferably, the thermally expandable foamed particles are polyvinyl alcohol microspheres, polystyrene microspheres, or polyacrylate microspheres.

[0030] Preferably, based on the mass of the phosphating polymerized particles, the mass of the grafted thermally expandable foamed particles is 40 - 60 wt%.

[0031] The present invention provides a preparation method of a long-acting flame-retardant aluminized bubble film, including:

[0032] S1. Prepare a mixture of phosphating polymerized particles and polyethylene, and load it into each extruder;

[0033] S2. After the aluminized films on both sides are unrolled, perform layer-by-layer extrusion compounding in the order of the extruder and the bubble roller to form multiple bubble layers on the aluminized film; then the aluminized films on both sides move to the central position, and the central extruder bonds the aluminized films on both sides, and press-wind to obtain the long-acting flame-retardant aluminized bubble film.

[0034] When compounding the long-acting flame-retardant aluminized bubble film with a single-layer bubble layer, one side of the bubble roller can be not activated.

[0035] Preferably, in the step S1, the addition amount of the phosphating polymerized particles is 5 - 20 wt% of the polyethylene.

[0036] Preferably, in the step S2, the height of the bubble roller is 3 - 8 mm.

[0037] Preferably, in the step S2, the die head temperature of the extruder is 220 - 260 °C.

[0038] The long-lasting flame-retardant aluminized bubble film provided by the present invention can be applied to flame-retardant and / or heat-insulating structures, components and equipment.

[0039] Therefore, the present invention has the following beneficial effects: The present invention introduces a micro-bubble structure in the bubble layer and the adhesive layer to reduce the heat conduction path. The combined bubble structure generated by thermoforming makes the internal bubble structure of the long-lasting flame-retardant aluminized bubble film rich, greatly improving the long-term heat-insulating ability of the long-lasting flame-retardant aluminized bubble film. In addition, among the polymer particles forming the micro-bubbles, ZIF67 itself has a porous structure. Such a hollow structure not only helps the generation of micro-bubbles, but also helps to improve the flame-retardant ability. At the same time, the outer aluminized film can play a role in reflecting thermal radiation and protection, which can help extend the service life of the long-lasting flame-retardant aluminized bubble film. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic flow chart of the preparation process of the long-lasting flame-retardant aluminized bubble film of the present invention;

[0041] Figure 2 is a schematic structural diagram of the long-lasting flame-retardant aluminized bubble film obtained by the present invention.

[0042] Among them, aluminized film 1, adhesive layer 2, bubble layer 3, bubble 4, micro-bubble 5. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] The present invention will be further described below in conjunction with specific embodiments. Those of ordinary skill in the art will be able to implement the present invention based on these descriptions. In addition, the embodiments of the present invention involved in the following description are usually only a part of the embodiments of the present invention, rather than all the embodiments. Therefore, all other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0044] The sources of the raw materials in this part are as follows:

[0045] Polystyrene microspheres, particle size 2-5 μm, purchased from Yiyuan Bio; cobalt nitrate hexahydrate, CAS No. 10026-22-9, purchased from Aladdin; ammonium persulfate, CAS No. 7727-54-0, purchased from Aladdin; 2-methylimidazole, CAS No. 693-98-1, purchased from Aladdin; N,N-dimethylformamide, DMF, CAS No. 68-12-2, purchased from Aladdin; low-density polyethylene, LDPE, purchased from Maoming Petrochemical; maleic anhydride, CAS No. 108-31-6, purchased from Maclean; aluminized film, thickness 12 μm, PET as substrate, aluminized thickness 200-800 angstroms, purchased from Pengyuan New Materials; hollow glass microspheres, particle size 2-5 μm, purchased from Hengyuan New Materials; silica microspheres, particle size 2-5 μm, purchased from Ruijiang New Materials. Sodium hypophosphite CAS number 123333-67-5 was purchased from Aladdin.

[0046] [Example]

[0047] Example 1

[0048] S1. Grafting LDPE: Weigh 50 g of maleic anhydride and 1000 g of LDPE, use 15 g of ammonium persulfate as an initiator, control the reaction temperature to 110°C, complete the grafting modification of LDPE, and obtain grafted LDPE.

[0049] S2.ZIF67 / grafted thermal expansion foamed particles:

[0050] Grafting thermally expandable foamed particles: Weigh 5 g of maleic anhydride and 100 g of polystyrene microspheres, use 1.5 g of ammonium persulfate as an initiator, control the reaction temperature at 110°C, complete the grafting modification of the polystyrene microspheres, and obtain grafted polystyrene microspheres.

[0051] 20g of grafted polystyrene microspheres were added to 14.6g (50mmol) of cobalt nitrate hexahydrate and 50mL of DMF, stirred at 100rpm for 10min, followed by the addition of 16.4g (200mmol) of 2-methylimidazole and stirring at 200rpm for 2h, and then filtered to obtain ZIF67 / grafted thermal expansion foam particles. Subsequently, the ZIF67 / grafted thermal expansion foam particles were placed in a 2wt% sodium hypophosphite deionized water solution, stirred at 300rpm for 30min at room temperature, and filtered to obtain the grafted thermal expansion foam particles and the P-ZIF67 wrapped on their surface, i.e., P-ZIF67 / grafted thermal expansion foam particles. In the P-ZIF67 / grafted thermal expansion foam particles, the grafted thermal expansion foam particles accounted for 50wt%.

[0052] S3. P-ZIF67 / grafted thermally expandable foamed particles and grafted LDPE were mixed uniformly in a mass ratio of 1:9 to obtain a mixture, and the mixture was loaded into each extruder.

[0053] S4. PressFigure 1 In the shown process flow, the aluminized film is placed on the unwinding rollers on both sides respectively. After passing through the extruders and bubble rollers (bubble height: 6 mm) on both sides respectively, under the action of the middle extruder, the middle adhesive layer is formed, and the aluminized film on both sides is bonded to form an aluminized bubble film with a structure of aluminized film, adhesive layer, bubble layer, adhesive layer, bubble layer, adhesive layer and aluminized film. Its structure is as Figure 2 shown.

[0054] In the aluminized bubble film, the proportion of micro-bubbles in the bubble layer is 1 v%, and the proportion of bubbles is 90 v%; the proportion of micro-bubbles in the adhesive layer is 10 v%.

[0055] Comparative Example 1 (without adding P-ZIF67 / grafted thermally expandable foaming particles)

[0056] This comparative example is basically the same as Example 1, and the difference lies in: S2 is cancelled; the mixture in S3 is changed to grafted LDPE.

[0057] Comparative Example 2 (without adding P-ZIF67)

[0058] This comparative example is basically the same as Example 1, and the difference lies in: in S2, P-ZIF67 / grafted thermally expandable foaming particles are replaced by grafted thermally expandable foaming particles, and the preparation of the grafted thermally expandable foaming particles is the same as that in Example 1. In S3, the grafted thermally expandable foaming particles and grafted LDPE are mixed in a mass ratio of 1:9 to obtain a mixture.

[0059] Comparative Example 3 (without adding grafted thermally expandable foaming particles)

[0060] This comparative example is basically the same as Example 1, and the difference lies in: in S2, P-ZIF67 / grafted thermally expandable foaming particles are replaced by P-ZIF67; the specific preparation is as follows: 14.6 g (50 mmol) of cobalt nitrate hexahydrate and 50 mL of DMF are stirred at 100 rpm for 10 min, then 16.4 g (200 mmol) of 2-methylimidazole is added and stirred at 200 rpm for 2 h, and ZIF67 is obtained by filtration. Subsequently, ZIF67 is placed in a 2 wt% sodium hypophosphite deionized aqueous solution and stirred at 300 rpm at room temperature for 30 min, and P-ZIF67 is obtained by filtration. In S3, P-ZIF67 and grafted LDPE are mixed in a mass ratio of 1:9 to obtain a mixture.

[0061] Comparative Example 4 (different structures of P-ZIF67 / grafted thermally expandable foaming particles)

[0062] This comparative example is basically the same as Example 1, and the difference lies in:

[0063] S2. Mixed particles:

[0064] Grafting thermally expandable foamed particles: Weigh 5 g of maleic anhydride and 100 g of polystyrene microspheres, use 1.5 g of ammonium persulfate as an initiator, control the reaction temperature at 110°C, complete the grafting modification of the polystyrene microspheres, and obtain grafted polystyrene microspheres.

[0065] 14.6 g (50 mmol) of cobalt nitrate hexahydrate and 50 mL of DMF were stirred at 100 rpm for 10 min, followed by the addition of 16.4 g (200 mmol) of 2-methylimidazole and stirring at 200 rpm for 2 h. The mixture was then filtered to obtain ZIF67 (particle size approximately 100 nm). The ZIF67 was then placed in a 2 wt% sodium hypophosphite deionized water solution, stirred at 300 rpm for 30 min at room temperature, and filtered to obtain P-ZIF67.

[0066] The P-ZIF67 and the grafted thermally expandable foamed particles are mixed to obtain mixed particles, wherein the grafted thermally expandable foamed particles account for 50 wt %.

[0067] Comparative Example 5 (different thermal expansion foamed particles)

[0068] This comparative example is basically the same as Example 1, except that in S2, the polystyrene microspheres are replaced by hollow glass microspheres.

[0069] Comparative Example 6 (different thermal expansion foamed particles)

[0070] This comparative example is basically the same as Example 1, except that in S2, the polystyrene microspheres are replaced by silica microspheres.

[0071] Comparative Example 7 (ungrafted LDPE)

[0072] This comparative example is substantially the same as Example 1, except that: S1 is omitted; and in S3, P-ZIF67 / grafted thermally expandable foamed particles and LDPE are mixed in a mass ratio of 1:9 to obtain a mixture.

[0073] Comparative Example 8 (non-grafted thermally expandable foamed particles)

[0074] This comparative example is basically the same as Example 1, except that: in S2, the grafting of polystyrene microspheres is cancelled, and they are directly put into the preparation process of P-ZIF67 to obtain P-ZIF67 / thermal expansion foamed particles.

[0075] Comparative Example 9 (Amount of P-ZIF67 / grafted thermally expandable foamed particles added)

[0076] This comparative example is substantially the same as Example 1, except that in S3, P-ZIF67 / grafted heat-expandable foamed particles and grafted LDPE are uniformly mixed in a mass ratio of 1:3 to obtain a mixture.

[0077] Comparative Example 10 (Addition amount of P-ZIF67 / grafted thermally expandable microspheres)

[0078] This comparative example is basically the same as Example 1, except that in S3, P-ZIF67 / grafted thermally expandable microspheres and grafted LDPE are mixed evenly in a mass ratio of 1:20 to obtain a mixture.

[0079] Comparative Example 11 (ZIF67 / grafted thermally expandable microspheres)

[0080] This comparative example is basically the same as Example 1, except that in S2, ZIF67 / grafted thermally expandable microspheres are not treated with 2 wt% sodium hypophosphite for phosphating.

[0081]

Performance Test

[0082] ① The vertical burning test adopts the UL94 standard

[0083] Grade classification:

[0084] V-0 level: The single afterflame time ≤ 10 s, the total afterflame time ≤ 50 s, and there is no molten droplet to ignite absorbent cotton.

[0085] V-1 level: The single afterflame time ≤ 30 s, the total afterflame time ≤ 250 s, and other requirements are the same as those of V-0 level.

[0086] V-2 level: The afterflame time is the same as that of V-1 level, but molten droplet is allowed to briefly ignite absorbent cotton.

[0087] The specific operation steps are as follows:

[0088] (1) Test conditions and procedures

[0089] Specimen specifications

[0090] Dimensions: length 125 mm ± 5 mm, width 13.0 mm ± 0.3 mm.

[0091] Pretreatment: Treat at room temperature (23°C ± 2°C, 50% humidity) for 48 hours, or high-temperature aging (70°C ± 2°C) for 168 hours.

[0092] Flame parameters

[0093] Flame height: 20 mm ± 2 mm (blue flame), and the fuel gas is methane or propane.

[0094] Flame application time: 10 s ± 0.5 s each time, repeated twice.

[0095] Test environment

[0096] Laboratory conditions: temperature 15°C to 35°C, humidity 45% to 75%.

[0097] (2) Criteria for Judgment Details

[0098] Afterglow / Afterglow Time: The continuous burning time after the flame is removed (e.g., for V-0 grade, ≤ 10 seconds).

[0099] Burning Range: The specimen shall not burn to the fixture fixed end.

[0100] Droplet Behavior: For V-0 / V-1 grades, it is prohibited for droplets to ignite the cotton wool below, and for V-2 grade, short-term ignition is allowed.

[0101] (3) Supplementary Requirements

[0102] Five specimens in each group need to complete 10 tests, and the total burning time is statistically calculated.

[0103] ② Thermal Conductivity Test: The test conditions are cold plate at 15°C and hot plate at 35°C; the test sample size is 300mm * 300mm * (5 - 80)mm, the surface should be flat, and the unevenness is not more than 0.5mm / m. Three groups of data are tested and the average value is taken.

[0104] ③ Aging Test: Place a 15cm * 15cm sample with the aluminum foil on the back into the aging chamber. One cycle is 12h, including 8h of ultraviolet irradiation at 60°C and 4h of condensation at 50°C, for 7 days.

[0105] After the aging test, according to ① Vertical Burning Test to determine the flame retardant effect and verify the durability of the flame retardant performance again.

[0106] The obtained data results are shown in Table 1. It can be seen from observing Table 1 that in Comparative Examples 1 and 2, the lack of P-ZIF67 caused the material itself to lose its flame retardant performance. In addition, due to the loss of the influence of microbubbles, the thermal conductivity also increased to a certain extent, that is, the heat preservation performance decreased (Comparative Examples 1, 2, 3). In Comparative Examples 4, 7, and 8, under different synthesis conditions, the flame retardant performance was different. This is because under the aging effect, the flame retardant migrated and accumulated to different degrees, resulting in local flame retardant failure and thus increasing the possibility of combustion. Among them, although changing the structure of P-ZIF67 / grafted thermally expanded foamed particles can also obtain an aluminized bubble film with better flame retardancy, the flame retardant performance of the aluminized bubble film will decline sharply after 7 days of aging.

[0107] In Comparative Examples 5 and 6, the industrially commonly used silica and glass microspheres have low thermal conductivity, and the formed acidic sites cannot effectively cooperate with the flame retardant, but instead increase the possibility of combustion. Therefore, the flame retardant grade of the obtained aluminized bubble film declined, and it could not maintain the stability of the flame retardant performance after aging, and the flame retardant grade declined; it was proved that not all hollow structure microspheres are suitable for application in aluminized bubble films.

[0108] For Comparative Examples 9 and 10, too much or too little proportion of the flame retardant will affect the flame retardant performance. The component P-ZIF67 is an important flame retardant component. Without phosphating, ZIF67 will cause a significant decline in the flame retardant performance. The thermal conductivity is mainly related to the bubble layer and the aluminum foil surface, and the selection of the thermal expansion particles is mainly relevant, and the influence of other aspects is not particularly significant.

[0109] Table 1 Performance Comparison Table

[0110]

[0111]

Claims

1. A long-lasting flame-retardant aluminized bubble film, characterized in that, It includes at least one layer of bubble layer and aluminized films wrapping the upper and lower surfaces of the bubble layer. Adjacent two layers of bubble layers are bonded through an adhesive layer, and the bubble layer and the aluminized film are bonded through an adhesive layer; The bubble layer contains bubbles and micro-bubbles, and the adhesive layer contains micro-bubbles; the micro-bubbles are formed by phosphated polymer particles, and the phosphated polymer particles include grafted thermally expandable foaming particles and ZIF67 phosphide wrapped on their surfaces.

2. The long-acting flame-retardant aluminized bubble film according to claim 1, characterized in that, The volume ratio of micro-bubbles in the adhesive layer is 5-20%; the volume ratio of bubbles in the bubble layer is 80-95%, and the volume ratio of micro-bubbles is 0.25-2%; Preferably, the particle size of the ZIF67 phosphide is 20-200 nm; Preferably, the particle size of the grafted thermally expandable foaming particles is 2-5 μm.

3. The long-acting flame-retardant aluminized bubble film according to claim 1 or 2, characterized in that, The bubble layer contains bubbles, micro-bubbles and polyethylene, and the adhesive layer contains micro-bubbles and polyethylene; Preferably, the polyethylene is low-density polyethylene; Preferably, the polyethylene is polyethylene after graft modification; Preferably, the graft modification includes: using ammonium persulfate as an initiator, controlling the reaction temperature at 95-120 °C, and graft-modifying polyethylene with acrylic acid or maleic anhydride.

4. The long-acting flame-retardant aluminized bubble film according to claim 1, wherein The preparation of the phosphated polymer particles includes: putting grafted thermally expandable foaming particles into a cobalt salt solution, adding an organic ligand, stirring in an organic solvent to obtain a precursor, and then phosphating the precursor in a phosphorus-containing solution to obtain phosphated polymer particles; Preferably, the cobalt salt is at least one of cobalt nitrate, cobalt sulfate, cobalt chloride, and cobalt acetate; Preferably, the organic ligand is 2-methylimidazole and / or 2-(aminomethyl)imidazole; Preferably, the organic solvent is at least one of methanol, ethanol, and N,N-dimethylformamide; Preferably, the molar ratio between cobalt in the cobalt salt and the organic ligand is 1:(3-5); Preferably, the stirring time is 2-8 h; Preferably, the stirring speed is 200-500 rpm; Preferably, the phosphorus-containing solution is a hypophosphite solution; preferably, the phosphorus-containing solution is 2 wt% sodium hypophosphite; Preferably, stir at 200-500 rpm for at least 30 min to complete phosphating.

5. The long-acting flame-retardant aluminized bubble film according to claim 1, wherein The preparation of the grafted thermally expandable foaming particles includes: using ammonium persulfate as an initiator, controlling the reaction temperature at 95-120 °C, and graft-modifying thermally expandable foaming particles with acrylic acid or maleic anhydride. Preferably, the thermally expandable foaming particles are polyvinyl alcohol microspheres, polystyrene microspheres or polyacrylate microspheres.

6. The long-acting flame-retardant aluminized bubble film according to claim 1 or 4 or 5, characterized in that, Based on the mass of the phosphated polymer particles, the mass of the grafted thermally expandable foaming particles is 40-60 wt%.

7. The preparation method of the long-acting flame-retardant aluminized bubble film according to any one of claims 1 to 6, characterized in that, It includes: S1. Prepare a mixture of phosphated polymer particles and polyethylene, and load it into each extruder; S2. After the aluminized films on both sides are unrolled, perform layer-by-layer extrusion and lamination in the order of extruder and bubble roller to form multiple layers of bubble layers on the aluminized films; then the aluminized films on both sides move to the central position, and the central extruder bonds the aluminized films on both sides, and press and wind to obtain a long-lasting flame-retardant aluminized bubble film.

8. The preparation method according to claim 7, characterized in that, In the S1, the addition amount of the phosphated polymer particles is 5-20 wt% of the polyethylene.

9. The preparation method according to claim 7, characterized in that, In the S2, the height of the bubble roller is 3-8 mm; Preferably, the die head temperature of the extruder is 220 to 260 °C.

10. Application of the long-acting flame-retardant aluminized bubble film according to any one of claims 1 to 6 or the long-acting flame-retardant aluminized bubble film prepared by the preparation method according to any one of claims 7 to 9 in flame-retardant and / or heat-insulating structures, components and equipment.

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