Novel hot-process aluminum-plastic film and preparation method thereof

Abstract

The invention relates to the technical field of aluminum plastic films, and particularly discloses a novel hot-process aluminum plastic film and a preparation method thereof. The novel hot-process aluminum plastic film comprises an outer layer, a middle layer, an inner layer, a bonding layer and an aluminum foil layer which are arranged in sequence, the raw materials of the inner layer comprise matrix resin and acrylic resin; the raw materials of the bonding layer comprise a curing agent and a passivating agent. The invention relates to a preparation method of a novel hot-process aluminum-plastic film, which comprises the following steps: adding acrylic resin master batch into matrix resin master batch, uniformly mixing to obtain an inner-layer raw material, and preparing a composite film with a heat-sealing layer doped with acrylic resin in a three-layer co-extrusion manner, the method comprises the following steps: uniformly stirring and mixing a curing agent and a passivating agent to obtain a treating agent, then selecting an aluminum foil as an aluminum foil layer, coating the treating agent on two surfaces of the aluminum foil layer in a micro-concave coating manner, and finally drying and depositing at 180-230 DEG C to obtain a treated aluminum foil layer; and performing hot-process compounding on the treated aluminum foil layer and the inner layer of the composite film to obtain the novel hot-process aluminum-plastic film.

Description

Technical Field

[0001] The present application relates to the technical field of aluminum-plastic films, and in particular to a novel thermal aluminum-plastic film and a preparation method thereof. Background Art

[0002] As an important packaging material, aluminum-plastic film is widely used in the fields of batteries, food, and medicine. Traditional aluminum-plastic film preparation methods mainly include dry method and hot method. The aluminum-plastic film prepared by the dry method has high liquid resistance, but the production cycle is long and the cost is high. Although the aluminum-plastic film prepared by the hot method has a short production cycle and low cost, it is suitable for enterprise production, but its liquid resistance and aluminum foil adhesion performance are relatively poor. Therefore, how to prepare aluminum-plastic film with high liquid resistance and high aluminum foil adhesion by hot method has become a problem to be solved in the current field of packaging material technology. Summary of the invention

[0003] In order to improve the liquid resistance and aluminum foil adhesion of an aluminum-plastic film, the present application provides a novel thermal aluminum-plastic film and a preparation method thereof.

[0004] In the first aspect, the present application provides a novel thermal aluminum-plastic film, which adopts the following technical solution: A novel thermal aluminum-plastic film comprises an outer layer, a middle layer, an inner layer, a bonding layer and an aluminum foil layer which are arranged in sequence; the raw materials of the inner layer include base resin and acrylic resin; the raw materials of the bonding layer include curing agent and passivating agent.

[0005] By adopting the above technical scheme, the aluminum foil layer is deposited using a curing agent and a passivating agent, and the metal salt in the curing agent and the passivating agent is deposited on the surface of the aluminum foil layer. The acrylic resin in the inner layer reacts with the curing agent deposited on the surface of the aluminum foil layer, thereby enhancing the bonding strength between the aluminum foil layer and the inner layer, and improving the liquid resistance of the final aluminum-plastic film.

[0006] In a specific embodiment, the base resin includes one or more of maleic anhydride grafted modified polypropylene, ethylene-vinyl acetate copolymer, and acidified resin.

[0007] In a specific embodiment, the curing agent is one of isocyanate, epoxy resin and phenolic resin.

[0008] In a specific embodiment, the passivating agent includes one of a chromate aqueous solution and a cerium salt aqueous solution.

[0009] In a specific embodiment, the raw material of the outer layer includes a propylene-based elastomer.

[0010] In a specific embodiment, the raw material of the middle layer includes one of block copolymer polypropylene and random copolymer polypropylene.

[0011] By adopting the above technical solution, the middle layer obtained from block copolymer polypropylene or random copolymer polypropylene has better high temperature resistance than the inner layer, which can ensure that the physical structure and performance of the middle layer are relatively stable when the inner layer is melted.

[0012] In a specific embodiment, the raw materials of the outer layer, the middle layer and the inner layer all further include additives, and the additives include fluoropolymer processing aids, heat stabilizers, antioxidants, lubricants and opening agents.

[0013] In a specific embodiment, the raw materials of the outer layer further include a UV absorber, a UV stabilizer, and an antistatic agent.

[0014] By adopting the above technical solution, the addition of ultraviolet absorbers, ultraviolet stabilizers and antistatic agents can further improve the stability of the outer layer.

[0015] In the second aspect, the present application provides a novel method for preparing a thermal aluminum-plastic film, which adopts the following technical solution: A novel method for preparing a thermal aluminum-plastic film comprises the following steps: Preparation of composite film: firstly, acrylic resin masterbatch is added to matrix resin masterbatch and mixed evenly to obtain inner layer raw material, and then outer layer raw material, middle layer raw material and inner layer raw material are co-extruded to obtain composite film with heat sealing layer doped with acrylic resin; and the melting point of the outer layer in the composite film is 140-160°C and the thickness is 4-8μm; the melting point of the middle layer is 160-180°C and the thickness is 32-64μm; the melting point of the inner layer is 130-140°C and the thickness is 4-8μm; Deposition passivation treatment: Stir and mix the curing agent and the passivating agent to obtain the treatment agent, then select aluminum foil as the aluminum foil layer, apply the treatment agent on both sides of the aluminum foil layer by micro-concave coating, and finally dry and deposit at 180-230°C to obtain the treated aluminum foil layer, so that the metal element content on the surface of the treated aluminum foil layer is 5-20 mg / m 2 ; Composite: The treated aluminum foil layer is composited with the inner layer of the composite film by thermal method to obtain a new type of thermal aluminum-plastic film.

[0016] By adopting the above technical scheme, a composite film with a heat-sealing layer doped with acrylic resin is first prepared by a three-layer co-extrusion method, and then the aluminum foil is subjected to a deposition passivation treatment using a treating agent composed of a curing agent and a passivating agent. Finally, the inner layer of the composite film is thermally composited with the treated aluminum foil layer to obtain a new type of thermally processed aluminum-plastic film with high liquid resistance.

[0017] In a specific embodiment, in the compounding step, the compounding temperature is 180-200°C.

[0018] By adopting the above technical solution, the compounding temperature is further limited, thereby improving the performance of the final aluminum-plastic film.

[0019] In summary, the present application includes at least one of the following beneficial technical effects: 1. In the present application, the aluminum foil layer is deposited by using a curing agent and a passivating agent, and the metal salt in the curing agent and the passivating agent is deposited on the surface of the aluminum foil layer, and the acrylic resin in the inner layer reacts with the curing agent deposited on the surface of the aluminum foil layer, thereby enhancing the bonding force between the aluminum foil layer and the inner layer, and improving the liquid resistance strength of the aluminum-plastic film finally obtained; 2. The middle layer obtained from block copolymer polypropylene or random copolymer polypropylene in this application has better high temperature resistance than the inner layer, which can ensure that the physical structure and performance of the middle layer are relatively stable when the inner layer is melted; 3. The method of the present application firstly uses a three-layer co-extrusion method to prepare a composite film with a heat-sealing layer doped with acrylic resin, then uses a treating agent composed of a curing agent and a passivating agent to deposit and passivate the aluminum foil, and finally the inner layer of the composite film is thermally composited with the treated aluminum foil layer to obtain a new type of thermal aluminum-plastic film with high liquid resistance. DETAILED DESCRIPTION

[0020] The present application is further described in detail below in conjunction with embodiments.

[0021] All raw materials in the embodiment can be obtained commercially. The matrix resin includes but is not limited to a mixture of one or more of maleic anhydride grafted modified polypropylene, ethylene-vinyl acetate copolymer, and acidified resin. Maleic anhydride grafted modified polypropylene is preferred in this application. Maleic anhydride grafted modified polypropylene can be a mixture of one or more of QF551 of Mitsui Chemicals of Japan, QE840 of Mitsui Chemicals of Japan, and P546 of Mitsubishi Chemical of Japan. In this application, QF551 of Mitsui Chemicals of Japan is preferred; ethylene-vinyl acetate copolymer can be a mixture of one or more of DuPont Elvax, Samsung E093A of South Korea, and Sumitomo Chemical D2043 of Japan. In this application, DuPont Elvax is preferred; block copolymer polypropylene can be a mixture of one or more of BC5FA of Japan Polyolefin Company and CF330 of South Korea Samsung, or a mixture of both. In this application, BC5FA of Japan Polyolefin Company is preferred; random copolymer The polypropylene can be one of FS5611 of Singapore TPC Company and PP673K of Sagit Basic Industries Company or a mixture of the two. In the present application, FS5611 of Singapore TPC Company is preferred; the propylene-based elastomer can be one of ExxonMobil 6102FL of the United States and ExxonMobil 3980FL of the United States or a mixture of the two. In the present application, ExxonMobil 6102FL is preferred; the curing agent includes but is not limited to one of isocyanate, epoxy resin, and phenolic resin. In the present application, epoxy resin is preferred; the fluoropolymer processing aid is the American 3MPPA fluorine-containing processing aid FX5920A; the heat stabilizer is zinc stearate; the antioxidant is antioxidant 1010; the lubricant is silicon dioxide; the opening agent is oleic acid amide; the ultraviolet absorber is 2-hydroxy-4-octyloxybenzophenone; the ultraviolet stabilizer is UV-326; and the antistatic agent is monoglyceride.

[0022] Preparation Example Preparation Example 1 Preparation Example 1 provides a method for preparing a chromate-containing aqueous solution, comprising the following steps: Add fluorozirconic acid, chromium phosphate, chromium nitrate, nano titanium dioxide and corrosion inhibitor into deionized water, stir and mix evenly to obtain a chromate-containing aqueous solution; wherein the weight ratio of fluorozirconic acid, chromium phosphate, chromium nitrate, nano titanium dioxide, corrosion inhibitor and deionized water is 15:1.5:1.5:27:1:45; the corrosion inhibitor is disodium ethylenediaminetetraacetate and triethanolamine, and the weight ratio of disodium ethylenediaminetetraacetate and triethanolamine is 1:5.

[0023] Preparation Example 2 Preparation Example 2 provides a method for preparing a cerium salt aqueous solution, comprising the following steps: Fluozirconic acid, cerium nitrate, cerium oxide, nano-titanium dioxide and corrosion inhibitor are added into deionized water, stirred and mixed evenly to obtain a cerium salt aqueous solution; wherein the weight ratio of fluozirconic acid, cerium nitrate, cerium oxide, nano-titanium dioxide, corrosion inhibitor and deionized water is 15:1.5:1.5:27:1:45; the corrosion inhibitor is disodium ethylenediaminetetraacetate and triethanolamine, and the weight ratio of disodium ethylenediaminetetraacetate and triethanolamine is 1:5. Example

[0024] Example 1 Embodiment 1 provides a novel preparation process of thermal aluminum-plastic film, comprising the following steps: Preparation of composite film: firstly, acrylic resin masterbatch is added to the matrix resin masterbatch and mixed evenly to obtain the inner layer raw material, and then the outer layer raw material, the middle layer raw material and the inner layer raw material are co-extruded to obtain a composite film with a heat-sealing layer doped with acrylic resin; and the melting point of the outer layer in the composite film is 140°C and the thickness is 4μm; the melting point of the middle layer is 160°C and the thickness is 32μm; the melting point of the inner layer is 130°C and the thickness is 4μm; the weight ratio of the acrylic resin masterbatch to the matrix resin masterbatch is 5:95; the matrix resin masterbatch is maleic anhydride grafted modified polypropylene; the outer layer raw material is propylene-based elastomer; the middle layer raw material is block copolymer polypropylene; Deposition passivation treatment: The curing agent and the passivating agent in Preparation Example 1 were stirred and mixed evenly to obtain a treatment agent, and then an aluminum foil was selected as the aluminum foil layer, and the treatment agent was coated on both sides of the aluminum foil layer by micro-concave coating. Finally, the deposition was dried at 205°C to obtain a treated aluminum foil layer, so that the metal element content on the surface of the treated aluminum foil layer was 5 mg / m 2 ; The curing agent is epoxy resin; the weight ratio of the curing agent to the passivating agent is 0.5:100; Composite: The treated aluminum foil layer and the inner layer of the composite film are thermally composited at 190°C to obtain a new type of thermal aluminum-plastic film.

[0025] Example 2 Embodiment 2 provides a novel preparation process of thermal aluminum-plastic film, comprising the following steps: Preparation of composite film: firstly, acrylic resin masterbatch and additives are added to the matrix resin masterbatch and mixed evenly to obtain the inner layer raw material, and then the outer layer raw material, the middle layer raw material and the inner layer raw material are co-extruded to obtain a composite film with a heat-sealing layer doped with acrylic resin; and the melting point of the outer layer in the composite film is 140°C and the thickness is 4μm; the melting point of the middle layer is 160°C and the thickness is 32μm; the melting point of the inner layer is 130°C and the thickness is 4μm; the weight ratio of acrylic resin masterbatch, matrix resin masterbatch and additive is 5:90:5; the matrix resin masterbatch is 1:10:10. It is maleic anhydride grafted modified polypropylene; the outer layer raw material is a mixture of propylene-based elastomer and additives, and the weight ratio of propylene-based elastomer to additives is 95:5; the middle layer raw material is a mixture of block copolymer polypropylene and additives, and the weight ratio of block copolymer polypropylene to additives is 98:2; the additives are a mixture of fluoropolymer processing aid, heat stabilizer, antioxidant, lubricant, and opening agent, and the weight ratio of fluoropolymer processing aid, heat stabilizer, antioxidant, lubricant, and opening agent is 1:1:1:1:1; Deposition passivation treatment: The curing agent and the passivating agent in Preparation Example 1 were stirred and mixed evenly to obtain a treatment agent, and then an aluminum foil was selected as the aluminum foil layer, and the treatment agent was coated on both sides of the aluminum foil layer by micro-concave coating. Finally, the deposition was dried at 205°C to obtain a treated aluminum foil layer, so that the metal element content on the surface of the treated aluminum foil layer was 5 mg / m 2 ; The curing agent is epoxy resin; the weight ratio of the curing agent to the passivating agent is 0.5:100; Composite: The treated aluminum foil layer and the inner layer of the composite film are thermally composited at 190°C to obtain a new type of thermal aluminum-plastic film.

[0026] Example 3 The difference between Example 3 and Example 2 is that, in the preparation of the composite film, the acrylic resin masterbatch and the additives are first added to the matrix resin masterbatch and mixed evenly to obtain the inner layer raw material, and then the outer layer raw material, the middle layer raw material and the inner layer raw material are co-extruded to obtain a composite film in which the heat-sealing layer is doped with acrylic resin; and the melting point of the outer layer in the composite film is 140°C and the thickness is 4μm; the melting point of the middle layer is 160°C and the thickness is 32μm; the melting point of the inner layer is 130°C and the thickness is 4μm; the weight ratio of the acrylic resin masterbatch, the matrix resin masterbatch and the additive is 5:90:5; the matrix resin masterbatch is maleic anhydride grafted modified polypropylene; the outer layer raw material is propylene-based elastic The raw material for the intermediate layer is a mixture of block copolymer polypropylene and additives, and the weight ratio of the block copolymer polypropylene and the additives is 98:2; the additives are a mixture of fluoropolymer processing aids, heat stabilizers, antioxidants, lubricants and opening agents, and the weight ratio of the fluoropolymer processing aids, heat stabilizers, antioxidants, lubricants and opening agents is 1:1:1:1:1:1; the remaining steps are consistent with Example 2.

[0027] Example 4 The difference between Example 4 and Example 3 is that, in the preparation of the composite film, the acrylic resin masterbatch and the additives are first added to the base resin masterbatch and mixed evenly to obtain the inner layer raw material, and then the outer layer raw material, the middle layer raw material and the inner layer raw material are subjected to a three-layer co-extrusion method to obtain a composite film in which the heat-sealing layer is doped with acrylic resin; and the melting point of the outer layer in the composite film is 150°C, and the thickness is 6μm; the melting point of the middle layer is 170°C, and the thickness is 48μm; the melting point of the inner layer is 135°C, and the thickness is 6μm; and the remaining steps are consistent with Example 3.

[0028] Example 5 The difference between Example 5 and Example 3 is that, in the preparation of the composite film, the acrylic resin masterbatch and the additives are first added to the base resin masterbatch and mixed evenly to obtain the inner layer raw material, and then the outer layer raw material, the middle layer raw material and the inner layer raw material are subjected to a three-layer co-extrusion method to obtain a composite film in which the heat-sealing layer is doped with acrylic resin; and the melting point of the outer layer in the composite film is 160°C, and the thickness is 8μm; the melting point of the middle layer is 180°C, and the thickness is 64μm; the melting point of the inner layer is 140°C, and the thickness is 8μm; and the remaining steps are consistent with Example 3.

[0029] Example 6 The difference between Example 6 and Example 4 is that in the composite membrane preparation step, the intermediate layer raw material is a mixture of random copolymer polypropylene and additives, and the weight ratio of the random copolymer polypropylene to the additive is 98:2; the remaining steps are consistent with Example 4.

[0030] Example 7 The difference between Example 7 and Example 4 is that the deposition passivation treatment is as follows: the curing agent and the passivating agent in Preparation Example 2 are stirred and mixed evenly to obtain a treatment agent, then an aluminum foil is selected as the aluminum foil layer, and the treatment agent is coated on both sides of the aluminum foil layer by micro-concave coating, and finally the deposition is dried at 205°C to obtain a treated aluminum foil layer, so that the metal element content on the surface of the treated aluminum foil layer is 5 mg / m 2 ; The remaining steps are consistent with Example 4.

[0031] Example 8 The difference between Example 8 and Example 4 is that the deposition passivation treatment is as follows: the curing agent and the passivating agent in Preparation Example 1 are stirred and mixed evenly to obtain a treatment agent, then an aluminum foil is selected as the aluminum foil layer, and the treatment agent is coated on both sides of the aluminum foil layer by micro-concave coating, and finally the deposition is dried at 205°C to obtain a treated aluminum foil layer, so that the metal element content on the surface of the treated aluminum foil layer is 12.5 mg / m 2 ; The remaining steps are consistent with Example 4.

[0032] Example 9 The difference between Example 9 and Example 4 is that the deposition passivation treatment is as follows: the curing agent and the passivating agent in Preparation Example 1 are stirred and mixed evenly to obtain a treatment agent, then an aluminum foil is selected as the aluminum foil layer, and the treatment agent is coated on both sides of the aluminum foil layer by micro-concave coating, and finally the deposition is dried at 205°C to obtain a treated aluminum foil layer, so that the metal element content on the surface of the treated aluminum foil layer is 20 mg / m 2 ; The remaining steps are consistent with Example 4.

[0033] Comparative Example Comparative Example 1 Comparative Example 1 provides a preparation process for a high-drawing depth and corrosion-resistant aluminum-plastic film, comprising the following steps: Preparation of passivation solution: Add fluorozirconic acid, sodium molybdate, nano titanium dioxide, corrosion inhibitor, and acrylic resin into deionized water, stir and mix evenly to obtain a passivation solution; wherein the weight ratio of fluorozirconic acid, sodium molybdate, nano titanium dioxide, corrosion inhibitor, acrylic resin, and deionized water is 18:2:30:2:30:50; the corrosion inhibitor is disodium ethylenediaminetetraacetate and triethanolamine, and the weight ratio of disodium ethylenediaminetetraacetate and triethanolamine is 1:5 Pretreatment of raw materials: Use a plasma surface processor to perform plasma pretreatment on the nylon layer, the plasma treatment frequency is 10kHz, the treatment voltage is 8KV, and the treatment power is 8m / min to obtain a rough nylon layer; use a corona treatment machine to perform corona pretreatment on the polypropylene layer, the corona power is 1.5KVA, and the corona time is 30s to obtain a rough polypropylene layer; use aluminum cleaning agent RSB-108 to remove grease stains on the surface of the aluminum foil layer, and then use deionized water to clean it, immerse the cleaned aluminum foil layer in a 40°C passivation solution for double-sided passivation treatment, soak for 3 minutes and then take it out to obtain a passivated aluminum foil layer; use deionized water to clean the passivated aluminum foil layer, and put it in an oven at 120°C for 4 hours to dry it to obtain an anti-corrosion aluminum foil layer.

[0034] Aluminum-plastic film pressing: polyurethane adhesive is evenly applied between the rough nylon layer and the anti-corrosion aluminum foil layer, and between the anti-corrosion aluminum foil layer and the rough polypropylene layer, and the three are stacked and bonded and then pressed to obtain the aluminum-plastic film.

[0035] Performance test liquid resistance: prepare 1mol / LLiPF6 electrolyte, the solute is 1mol / L LiPF6, the solvent is dimethyl carbonate, ethylene carbonate and diethyl carbonate, and the weight ratio of the three is 1:1:1, cut the aluminum-plastic film into strips with a width of 15mm and a length of 100mm, put the strips into LiPF6 electrolyte, and place them at 85℃ for 7 days, take them out and clean them, and test the electrolyte peeling strength according to GB / T8808-1988 "Peeling Test Method for Soft Composite Plastic Materials", the tensile speed is (300±50)mm / min, the higher the glass strength, the better the liquid resistance.

[0036] Peel strength: The peel strength of the aluminum foil layer in the aluminum-plastic film was tested according to ASTM-1876.

[0037] Table 1 Performance test results of aluminum-plastic film Combining Example 1 and Comparative Example 1, the liquid resistance and peel strength of the aluminum-plastic film in Example 1 are relatively high. It can be seen that by using the preparation process in the present application, the aluminum foil layer is deposited using a curing agent and a passivating agent, and the metal salts in the curing agent and the passivating agent are deposited on the surface of the aluminum foil layer. The acrylic resin in the inner layer reacts with the curing agent deposited on the surface of the aluminum foil layer to enhance the bonding force between the aluminum foil layer and the inner layer, thereby improving the liquid resistance and peel strength of the final aluminum-plastic film.

[0038] In combination with Examples 1-3, it can be seen that when preparing the composite film, adding additives such as fluorine-containing polymer processing aids, heat stabilizers, antioxidants, lubricants, anti-opening agents, UV absorbers, UV stabilizers, antistatic agents, etc. can improve the stability and aging resistance of the aluminum-plastic film, but has little effect on the liquid resistance and peel strength of the aluminum-plastic film.

[0039] Combining Example 2, Example 4 and Example 5, the liquid resistance and peel strength of the aluminum-plastic film in Example 4 are the highest. It can be seen that when preparing the composite film, increasing the thickness of the composite film, the performance of the aluminum-plastic film shows a trend of first increasing and then decreasing.

[0040] Combining Example 4 and Example 6, the liquid resistance and peel strength of the aluminum-plastic film in Example 4 and Example 6 are not much different. It can be seen that when preparing the composite film, the raw material of the middle layer is selected from random copolymer polypropylene, and the liquid resistance and peel strength of the aluminum-plastic film are also high.

[0041] Combining Example 4 and Example 7, the liquid resistance and peel strength of the aluminum-plastic film in Example 4 and Example 7 are not much different. It can be seen that when the aluminum foil layer is deposited and passivated, the cerium salt aqueous solution in Preparation Example 2 is selected, and the liquid resistance and peel strength of the aluminum-plastic film finally obtained are also high.

[0042] Combining Example 4, Example 8 and Example 9, it can be seen that when the aluminum foil layer is subjected to the passivation treatment, when the metal element content on the surface of the treated aluminum foil layer is 5-20 mg / m 2 When increasing the content of metal elements, the liquid resistance and peel strength of the aluminum-plastic film will also be improved.

[0043] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A new type of thermal aluminum-plastic film, characterized in that: It comprises an outer layer, a middle layer, an inner layer, a bonding layer and an aluminum foil layer which are arranged in sequence; the raw materials of the inner layer comprise base resin and acrylic resin; the raw materials of the bonding layer comprise curing agent and passivating agent.

2. A novel thermal aluminum-plastic film according to claim 1, characterized in that: The base resin includes one or more of maleic anhydride grafted modified polypropylene, ethylene-vinyl acetate copolymer, and acidified resin.

3. A novel thermal aluminum-plastic film according to claim 1, characterized in that: The curing agent is one of isocyanate, epoxy resin and phenolic resin.

4. A novel thermal aluminum-plastic film according to claim 1, characterized in that: The passivating agent includes one of a chromate aqueous solution and a cerium salt aqueous solution.

5. A novel thermal aluminum-plastic film according to claim 1, characterized in that: The raw material of the outer layer includes propylene-based elastomer.

6. A novel thermal aluminum-plastic film according to claim 1, characterized in that: The raw material of the middle layer includes one of block copolymer polypropylene and random copolymer polypropylene.

7. The novel thermal aluminum-plastic film according to claim 1 is characterized in that: The raw materials of the outer layer, the middle layer and the inner layer all further include additives, and the additives include fluorine-containing polymer processing aids, heat stabilizers, antioxidants, lubricants and opening agents.

8. A novel thermal aluminum-plastic film according to claim 7, characterized in that: The raw materials of the outer layer also include ultraviolet absorbers, ultraviolet stabilizers and antistatic agents.

9. A method for preparing a novel thermal aluminum-plastic film according to any one of claims 1 to 8, characterized in that: The following steps are involved: Preparation of composite film: firstly, acrylic resin masterbatch is added to matrix resin masterbatch and mixed evenly to obtain inner layer raw material, and then outer layer raw material, middle layer raw material and inner layer raw material are co-extruded to obtain composite film with heat sealing layer doped with acrylic resin; and the melting point of outer layer in the composite film is 140-160°C and the thickness is 4-8μm; the melting point of middle layer is 160-180°C and the thickness is 32-64μm; the melting point of inner layer is 130-140°C and the thickness is 4-8μm; Deposition passivation treatment: Stir and mix the curing agent and the passivating agent to obtain the treatment agent, then select aluminum foil as the aluminum foil layer, apply the treatment agent on both sides of the aluminum foil layer by micro-concave coating, and finally dry and deposit at 180-230°C to obtain the treated aluminum foil layer, so that the metal element content on the surface of the treated aluminum foil layer is 5-20 mg / m 2 ; Composite: The treated aluminum foil layer is composited with the inner layer of the composite film by thermal method to obtain a new type of thermal aluminum-plastic film.

10. The method for preparing a novel thermal aluminum-plastic film according to claim 9, characterized in that: In the compounding step, the compounding temperature is 180-200°C.

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