High-effect nano-composite metallized film and preparation process and application thereof

Abstract

The invention relates to the technical field of thin film capacitors, in particular to a high-effect nano-composite metallized thin film and a preparation process and application thereof. The polyimide composite material is prepared from the following raw materials in percentage by mass: 30 to 45 percent of modified polyimide, 2.5 to 7.5 percent of nano filler, 5.0 to 14.5 percent of maleic anhydride grafted polyethylene, 20.0 to 36.5 percent of interface modifier, 0.2 to 1.0 percent of antioxidant, 0.1 to 1.6 percent of metal ash inhibitor and 0.1 to 0.5 percent of stabilizer, the nano filler is La (at) CeO2 and Fe3O4 (at) TiO2, and the mass ratio of the La (at) CeO2 to the Fe3O4 (at) TiO2 is (1-5): (1-2). The nano-composite metallized film is superior to a traditional metallized film in performance, structure and application, has higher conductivity, mechanical strength and functionalization performance, and is suitable for wider high-tech fields.

Description

Technical Field

[0001] This invention relates to the field of thin-film capacitor technology, and more specifically, to a high-performance nanocomposite metallized thin film, its preparation process, and its applications. Background Technology

[0002] With the rapid development of electronic technology, the requirements for capacitor performance are increasing. Traditional metallized film capacitors have limitations in conductivity, heat resistance, and energy loss. Metallized dielectric films are a key component of high-voltage capacitors, and due to their outstanding temperature and voltage resistance, they are widely used in power systems, pulse power, and new energy vehicles. Metallized films have excellent self-healing properties, but under high-current impacts, the extremely thin metal electrodes are prone to breakage and failure, which is a significant factor affecting the safe and stable operation of capacitors.

[0003] Nanocomposite metallized thin films are thin film materials composed of nanoscale metals or metal compounds combined with a matrix material (such as polymers, ceramics, or metals). Due to the introduction of nanoparticles, the films typically exhibit higher hardness, wear resistance, thermal stability, and mechanical strength.

[0004] In existing technologies, nanocomposite metallized films suffer from the following potential drawbacks: Although the conductivity of nanocomposites can be significantly improved by introducing conductive fillers such as MXene, carbon nanotubes, and graphene, their conductivity is still limited by factors such as filler dispersion, poor interfacial contact, and filler agglomeration. The weak interfacial interaction between the filler and the polymer matrix leads to a decrease in interfacial thermal resistance and electrical conductivity. Furthermore, metal nanowire network films are prone to corrosion and aging at high temperatures, reducing their long-term stability. Summary of the Invention

[0005] This invention provides a high-efficiency nanocomposite metallized thin film, its preparation process, and its applications. The prepared nanocomposite metallized thin film exhibits significant advantages in chemical properties, especially in corrosion resistance and thermal stability. Due to the high surface area and unique physicochemical properties of its nanomaterials, it can undergo strong interfacial interactions with the film matrix, thereby significantly enhancing its thermal stability. The nanocomposite metallized thin film outperforms traditional metallized thin films in terms of performance, structure, and applications, possessing higher conductivity, mechanical strength, and functional properties, making it suitable for a wider range of high-tech fields.

[0006] In a first aspect, the present invention provides a high-performance nanocomposite metallized film, which is prepared from the following raw materials in the indicated mass percentages: 30-45% modified polyimide, 2.5-7.5% nanofiller, 5.0-14.5% maleic anhydride-grafted polyethylene, 20.0-36.5% interface modifier, 0.2-1.0% antioxidant, 0.1-1.6% metal ash inhibitor, and 0.1-0.5% stabilizer;

[0007] The nanofillers are La@CeO2 and Fe3O4@TiO2, and the mass ratio of La@CeO2 to Fe3O4@TiO2 is 1-5:1-2.

[0008] The above technical solutions, through the introduction of nanofillers and organic materials, can significantly enhance the mechanical strength, modulus, and toughness of polyimide composites. Modified polyimides typically exhibit higher thermal stability, allowing them to maintain good performance even at high temperatures.

[0009] Preferably, the modified polyimide is prepared by mixing monomers 2,2-bis[4-(2,4-diaminophenoxy)phenyl]hexafluoropropane and 2,2-bis[4-(2-trifluoromethyl-4-aminophenoxy)phenyl]hexafluoropropane in a certain proportion, dissolving the mixture in an N-methylpyrrolidone solution to obtain a precursor solution, and then performing a polycondensation reaction between the precursor solution and pyromellitic dianhydride.

[0010] By modifying the material with monomers 2,2-bis[4-(2,4-diaminophenoxy)phenyl]hexafluoropropane and 2,2-bis[4-(2-trifluoromethyl-4-aminophenoxy)phenyl]hexafluoropropane, and introducing flexible groups or copolymerizing, the flexibility and tensile properties of the material can be significantly improved. After modification, the polyimide has enhanced adhesion to various substrates, making it suitable for a wider range of applications.

[0011] Preferably, the mass ratio of 2,2-bis[4-(2,4-diaminophenoxy)phenyl]hexafluoropropane to 2,2-bis[4-(2-trifluoromethyl-4-aminophenoxy)phenyl]hexafluoropropane is 1-4:1.

[0012] Using the above technical solution, 2,2-bis[4-(2-trifluoromethyl-4-aminophenoxy)phenyl]hexafluoropropane is used as a polyimide monomer to prepare polyimide films with heat resistance and low dielectric properties.

[0013] Preferably, the interface modifier is one or more of 3-trihydroxyphenyl-1-propanesulfonic acid, silane coupling agent, or titanate coupling agent.

[0014] Through the above technical solutions, the interface modifier reduces the surface energy of the filler, enabling it to disperse more uniformly in the matrix. The interface modifier improves the interfacial adhesion between the filler and the matrix through chemical bonding or physical entanglement. The interface modifier can form a flexible coating layer on the filler surface, creating a "core-shell" structure, thereby enhancing the interface's deformation capacity and stress transfer capability.

[0015] Preferably, the antioxidant is one or more of 2,6-di-tert-butyl-4-methylphenol, tris(2,4-di-tert-butylphenyl) phosphite, and thiodipropionate.

[0016] Through the above technical solutions, antioxidants react with free radicals to transform them into stable compounds, thereby interrupting the oxidation chain reaction. Antioxidants also react with free radicals or peroxides to form stable intermediates, thus terminating the propagation of the oxidation chain. Antioxidants can improve the thermal and light stability of nanocomposite metallized films.

[0017] Preferably, the metal ash inhibitor is one or more of 1H-benzotriazole-1-methanol, 3-amino-5-mercapto-1,2,3-triazole, molybdate, tungstate, chromate, and indium tin oxide.

[0018] The working principle of metal ash inhibitors, as described above, mainly involves their adsorption behavior on metal surfaces and their inhibitory effect on the corrosion process. Metal ash inhibitors can also inhibit corrosion by forming a protective film, creating an oxide layer or hydroxide film on the metal surface to isolate the metal from the corrosive environment.

[0019] Preferably, the stabilizer is one or more selected from 2,6-dimethyl-4-nitro-1,3,5-tricyclohexyl-2-naphthoquinone, borate ester, mercaptosuccinic acid, and dithiodisuccinic acid.

[0020] Through the above technical solutions, stabilizers inhibit the aging process of composite materials caused by oxygen, light, and heat, preventing degradation, discoloration, and performance decline during processing, storage, and use.

[0021] Secondly, the present invention provides a method for preparing a high-performance nanocomposite metallized thin film, comprising the following steps:

[0022] (1) The modified polyimide and the interface modifier are mixed to obtain the matrix;

[0023] (2) The nanofiller was added to a xylene solution of maleic anhydride-grafted polyethylene and heated and stirred to obtain the desired product.

[0024] Nanocomposite materials;

[0025] (3) Grind and mix the matrix obtained in step (1), the nanocomposite material obtained in step (2), the antioxidant, the metal ash inhibitor and the stabilizer, heat and melt plasticize them and then extrude them to obtain polyimide sheets;

[0026] (4) The polyimide sheet obtained in step (3) is stretched biaxially using a longitudinal stretching machine and a transverse stretching machine, and then cooled and annealed by a cooling roller to obtain a polyimide film;

[0027] (5) The polyimide film obtained in step (4) is first subjected to surface roughening, activation and reduction treatment, and then micropores are formed on the surface of the polyimide film by plasma electro-erosion process. Then, a metal oxide gel solution is sprayed onto the polyimide film by vacuum spraying or ion plating film forming technology to obtain a high-efficiency nanocomposite metallized film.

[0028] Preferably, in step (5), the metal oxide is one of nickel oxide, titanium oxide, and tungsten oxide.

[0029] The third invention provides an application of a high-efficiency nanocomposite metallized thin film in a high-voltage capacitor.

[0030] In summary, the present invention has the following beneficial effects:

[0031] 1. In this invention, the nanofillers are La@CeO2 and Fe3O4@TiO2. La@CeO2 can serve as a heterogeneous nucleation substrate, refining Si particles or Al3Ni reinforcing phases in the composite material. Appropriate addition of La@CeO2 can significantly improve the hardness, strength, and ductility of the composite material. The main functions of La@CeO2 in the composite material include grain refinement, phase reinforcement, improved mechanical properties, improved microstructure, crack inhibition, reaction promotion, and optimized heat treatment effects. Fe3O4, as the core component, possesses excellent magnetic properties, enabling rapid separation and recycling of the composite material after photocatalytic reaction via an external magnetic field, thereby increasing its reusability. TiO2, as the outer shell component, exhibits excellent photocatalytic performance, absorbing ultraviolet light and converting it into chemical energy. The combination of La@CeO2 strengthening grain boundaries and Fe3O4@TiO2 electromagnetic loss reduction provides both high strength and electromagnetic shielding. The oxygen defect repair capability of La@CeO2, combined with the dense outer shell of Fe3O4@TiO2, inhibits electrochemical corrosion. Nanofillers pin grain boundaries and inhibit high-temperature deformation of thin films.

[0032] 2. The modified polyimide in this invention is prepared by mixing monomers 2,2-bis[4-(2,4-diaminophenoxy)phenyl]hexafluoropropane and 2,2-bis[4-(2-trifluoromethyl-4-aminophenoxy)phenyl]hexafluoropropane in a certain proportion, dissolving the mixture in an N-methylpyrrolidone solution to obtain a precursor solution. This precursor solution is then subjected to a polycondensation reaction with pyromellitic dianhydride. The modified polyimide exhibits excellent high-temperature resistance, maintaining good physical and chemical properties even at high temperatures. The tensile strength, impact resistance, and abrasion resistance of the modified polyimide are significantly improved. The modified polyimide also demonstrates good resistance to various chemicals and is suitable for corrosive environments. Through the molecular design of fluorinated diamine monomers combined with a low-temperature polycondensation process, the modified polyimide achieves a balance between high thermal stability, excellent solubility, and gas separation performance.

[0033] 3. The nanocomposite metallized thin films prepared by this invention exhibit significant advantages in chemical properties, especially in corrosion resistance and thermal stability. Due to the high surface area and unique physicochemical properties of its nanomaterials, they can undergo strong interfacial interactions with the film matrix, thereby significantly enhancing their thermal stability. The nanocomposite metallized thin films outperform traditional metallized thin films in performance, structure, and applications, possessing higher conductivity, mechanical strength, and functional properties, making them suitable for a wider range of high-tech fields.

[0034] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the scope of protection of the present invention. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the embodiments. It should be noted that: unless otherwise specified, the conditions in the following embodiments are carried out according to conventional conditions or the conditions recommended by the manufacturer. Unless otherwise specified, the raw materials used in the following embodiments can be obtained from commercially available sources.

[0036] Example

[0037] Example 1

[0038] A high-performance nanocomposite metallized film is prepared from the following raw materials in weight percentages: 30% modified polyimide, 2.5% nanofiller, 5.0% maleic anhydride grafted polyethylene, 20.0% interface modifier, 0.2% antioxidant, 0.1% metal ash inhibitor, and 0.1% stabilizer.

[0039] The nanofillers are La@CeO2 and Fe3O4@TiO2, with a mass ratio of 1:2.

[0040] Modified polyimide is prepared by mixing monomers 2,2-bis[4-(2,4-diaminophenoxy)phenyl]hexafluoropropane and 2,2-bis[4-(2-trifluoromethyl-4-aminophenoxy)phenyl]hexafluoropropane in a certain proportion, dissolving the mixture in an N-methylpyrrolidone solution to obtain a precursor solution, which is then subjected to a polycondensation reaction with pyromellitic dianhydride; the mass ratio of 2,2-bis[4-(2,4-diaminophenoxy)phenyl]hexafluoropropane to 2,2-bis[4-(2-trifluoromethyl-4-aminophenoxy)phenyl]hexafluoropropane is 1:1.

[0041] The interface modifier is 3-trihydroxyphenyl-1-propanesulfonic acid; the antioxidant is 2,6-di-tert-butyl-4-methylphenol; the metal ash inhibitor is 1H-benzotriazole-1-methanol; and the stabilizer is 2,6-dimethyl-4-nitro-1,3,5-tricyclohexyl-2-naphthoquinone.

[0042] A method for preparing a high-performance nanocomposite metallized thin film includes the following steps:

[0043] (1) The modified polyimide and the interface modifier are mixed to obtain the matrix;

[0044] (2) The nanofiller was added to a xylene solution of maleic anhydride-grafted polyethylene and heated and stirred to obtain the desired product.

[0045] Nanocomposite materials;

[0046] (3) Grind and mix the matrix obtained in step (1), the nanocomposite material obtained in step (2), the antioxidant, the metal ash inhibitor and the stabilizer, heat and melt plasticize them and then extrude them to obtain polyimide sheets;

[0047] (4) The polyimide sheet obtained in step (3) is stretched biaxially using a longitudinal stretching machine and a transverse stretching machine, and then cooled and annealed by a cooling roller to obtain a polyimide film;

[0048] (5) The polyimide film obtained in step (4) is first subjected to surface roughening, activation and reduction treatment, and then micropores are formed on the surface of the polyimide film by plasma electro-erosion process. Then, a metal oxide gel solution is sprayed onto the polyimide film by vacuum spraying or ion plating film forming technology. The metal oxide is nickel oxide and titanium oxide with a mass ratio of 1:1, so as to obtain a high-efficiency nanocomposite metallized film.

[0049] Example 2

[0050] A high-performance nanocomposite metallized film is prepared from the following raw materials in weight percentages: 35% modified polyimide, 3.5% nanofiller, 6.5% maleic anhydride grafted polyethylene, 25.5% interface modifier, 0.5% antioxidant, 0.5% metal ash inhibitor, and 0.3% stabilizer.

[0051] The nanofillers are La@CeO2 and Fe3O4@TiO2, with a mass ratio of 2:1.

[0052] Modified polyimide is prepared by mixing monomers 2,2-bis[4-(2,4-diaminophenoxy)phenyl]hexafluoropropane and 2,2-bis[4-(2-trifluoromethyl-4-aminophenoxy)phenyl]hexafluoropropane in a certain proportion, dissolving the mixture in an N-methylpyrrolidone solution to obtain a precursor solution, and then subjecting the precursor solution to a polycondensation reaction with pyromellitic dianhydride; the mass ratio of 2,2-bis[4-(2,4-diaminophenoxy)phenyl]hexafluoropropane to 2,2-bis[4-(2-trifluoromethyl-4-aminophenoxy)phenyl]hexafluoropropane is 2:1.

[0053] The interface modifier is 3-trihydroxyphenyl-1-propanesulfonic acid; the antioxidant is 2,6-di-tert-butyl-4-methylphenol; the metal ash inhibitor is 1H-benzotriazole-1-methanol; and the stabilizer is 2,6-dimethyl-4-nitro-1,3,5-tricyclohexyl-2-naphthoquinone.

[0054] A method for preparing a high-performance nanocomposite metallized thin film includes the following steps:

[0055] (1) The modified polyimide and the interface modifier are mixed to obtain the matrix;

[0056] (2) The nanofiller was added to a xylene solution of maleic anhydride-grafted polyethylene and heated and stirred to obtain the desired product.

[0057] Nanocomposite materials;

[0058] (3) Grind and mix the matrix obtained in step (1), the nanocomposite material obtained in step (2), the antioxidant, the metal ash inhibitor and the stabilizer, heat and melt plasticize them and then extrude them to obtain polyimide sheets;

[0059] (4) The polyimide sheet obtained in step (3) is stretched biaxially using a longitudinal stretching machine and a transverse stretching machine, and then cooled and annealed by a cooling roller to obtain a polyimide film;

[0060] (5) The polyimide film obtained in step (4) is first subjected to surface roughening, activation and reduction treatment, and then micropores are formed on the surface of the polyimide film by plasma electro-erosion process. Then, a metal oxide gel solution is sprayed onto the polyimide film by vacuum spraying or ion plating film forming technology. The metal oxide is nickel oxide and titanium oxide with a mass ratio of 1:2 to obtain a high-efficiency nanocomposite metallized film.

[0061] Example 3

[0062] A high-performance nanocomposite metallized film is prepared from the following raw materials in weight percentages: 40% modified polyimide, 5.5% nanofiller, 12.5% ​​maleic anhydride grafted polyethylene, 28.5% interface modifier, 0.8% antioxidant, 1.2% metal ash inhibitor, and 0.4% stabilizer.

[0063] The nanofillers are La@CeO2 and Fe3O4@TiO2, with a mass ratio of 5:2.

[0064] Modified polyimide is prepared by mixing monomers 2,2-bis[4-(2,4-diaminophenoxy)phenyl]hexafluoropropane and 2,2-bis[4-(2-trifluoromethyl-4-aminophenoxy)phenyl]hexafluoropropane in a certain proportion, dissolving the mixture in an N-methylpyrrolidone solution to obtain a precursor solution, and then subjecting the precursor solution to a polycondensation reaction with pyromellitic dianhydride; the mass ratio of 2,2-bis[4-(2,4-diaminophenoxy)phenyl]hexafluoropropane to 2,2-bis[4-(2-trifluoromethyl-4-aminophenoxy)phenyl]hexafluoropropane is 3:1.

[0065] The interface modifier is 3-trihydroxyphenyl-1-propanesulfonic acid; the antioxidant is 2,6-di-tert-butyl-4-methylphenol; the metal ash inhibitor is 1H-benzotriazole-1-methanol; and the stabilizer is 2,6-dimethyl-4-nitro-1,3,5-tricyclohexyl-2-naphthoquinone.

[0066] A method for preparing a high-performance nanocomposite metallized thin film includes the following steps:

[0067] (1) The modified polyimide and the interface modifier are mixed to obtain the matrix;

[0068] (2) The nanofiller was added to a xylene solution of maleic anhydride-grafted polyethylene and heated and stirred to obtain the desired product.

[0069] Nanocomposite materials;

[0070] (3) Grind and mix the matrix obtained in step (1), the nanocomposite material obtained in step (2), the antioxidant, the metal ash inhibitor and the stabilizer, heat and melt plasticize them and then extrude them to obtain polyimide sheets;

[0071] (4) The polyimide sheet obtained in step (3) is stretched biaxially using a longitudinal stretching machine and a transverse stretching machine, and then cooled and annealed by a cooling roller to obtain a polyimide film;

[0072] (5) The polyimide film obtained in step (4) is first subjected to surface roughening, activation and reduction treatment, and then micropores are formed on the surface of the polyimide film by plasma electro-erosion process. Then, a metal oxide gel solution is sprayed onto the polyimide film by vacuum spraying or ion plating film forming technology. The metal oxide is nickel oxide and titanium oxide with a mass ratio of 1:3, so as to obtain a high-efficiency nanocomposite metallized film.

[0073] Example 4

[0074] A high-performance nanocomposite metallized film is prepared from the following raw materials in weight percentages: 45% modified polyimide, 7.5% nanofiller, 14.5% maleic anhydride grafted polyethylene, 36.5% interface modifier, 1.0% antioxidant, 1.6% metal ash inhibitor, and 0.5% stabilizer.

[0075] The nanofillers are La@CeO2 and Fe3O4@TiO2, with a mass ratio of 5:1.

[0076] Modified polyimide is prepared by mixing monomers 2,2-bis[4-(2,4-diaminophenoxy)phenyl]hexafluoropropane and 2,2-bis[4-(2-trifluoromethyl-4-aminophenoxy)phenyl]hexafluoropropane in a certain proportion, dissolving the mixture in an N-methylpyrrolidone solution to obtain a precursor solution, and then subjecting the precursor solution to a polycondensation reaction with pyromellitic dianhydride; the mass ratio of 2,2-bis[4-(2,4-diaminophenoxy)phenyl]hexafluoropropane to 2,2-bis[4-(2-trifluoromethyl-4-aminophenoxy)phenyl]hexafluoropropane is 4:1.

[0077] The interface modifier is 3-trihydroxyphenyl-1-propanesulfonic acid; the antioxidant is 2,6-di-tert-butyl-4-methylphenol; the metal ash inhibitor is 1H-benzotriazole-1-methanol; and the stabilizer is 2,6-dimethyl-4-nitro-1,3,5-tricyclohexyl-2-naphthoquinone.

[0078] A method for preparing a high-performance nanocomposite metallized thin film includes the following steps:

[0079] (1) The modified polyimide and the interface modifier are mixed to obtain the matrix;

[0080] (2) The nanofiller was added to a xylene solution of maleic anhydride-grafted polyethylene and heated and stirred to obtain the desired product.

[0081] Nanocomposite materials;

[0082] (3) Grind and mix the matrix obtained in step (1), the nanocomposite material obtained in step (2), the antioxidant, the metal ash inhibitor and the stabilizer, heat and melt plasticize them and then extrude them to obtain polyimide sheets;

[0083] (4) The polyimide sheet obtained in step (3) is stretched biaxially using a longitudinal stretching machine and a transverse stretching machine, and then cooled and annealed by a cooling roller to obtain a polyimide film;

[0084] (5) The polyimide film obtained in step (4) is first subjected to surface roughening, activation and reduction treatment, and then micropores are formed on the surface of the polyimide film by plasma electro-erosion process. Then, a metal oxide gel solution is sprayed onto the polyimide film by vacuum spraying or ion plating film forming technology. The metal oxide is nickel oxide and titanium oxide with a mass ratio of 1:1, so as to obtain a high-efficiency nanocomposite metallized film.

[0085] Comparative Example 1

[0086] The difference from Example 1 is that no nanofiller was added.

[0087] Comparative Example 2

[0088] The difference from Example 1 is that the modified polyimide is replaced with polyimide.

[0089] Comparative Example 3

[0090] The difference from Example 1 is that the nanofiller is replaced with nano-silica.

[0091] Performance testing:

[0092] The high-performance nanocomposite metallized films prepared in Examples 1-4 and Comparative Examples 1-3 were subjected to relevant performance tests, and the test results are shown in Table 1.

[0093] Table 1

[0094]

[0095] As shown in Table 1, the high-efficiency nanocomposite metallized film prepared in Example 1 has better conductivity, mechanical strength and functional properties, and is suitable for a wider range of high-tech fields.

[0096] Comparative Example 1, which did not contain nanofillers, exhibited lower dielectric constants and tensile strengths, demonstrating that the introduction of nanofillers and organic materials can significantly enhance the mechanical strength, modulus, and toughness of polyimide composites.

[0097] In Comparative Example 2, the modified polyimide was replaced with polyimide, resulting in lower dielectric breakdown strength and dielectric constant. This indicates that modified polyimide generally has higher thermal stability, enabling it to maintain good performance even at high temperatures.

[0098] In Comparative Example 3, the nanofiller was replaced with nano-silica. After 10,000 hours of cycling at 60°C, the capacitance change rate was relatively high, indicating that the combination of La@CeO2 strengthening grain boundaries and Fe3O4@TiO2 electromagnetic loss has both high strength and electromagnetic shielding performance.

[0099] The above description is merely an exemplary embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A high-performance nanocomposite metallized thin film, characterized in that, It is prepared from the following raw materials in weight percentage: 30-45% modified polyimide, 2.5-7.5% nanofiller, 5.0-14.5% maleic anhydride grafted polyethylene, 20.0-36.5% interface modifier, 0.2-1.0% antioxidant, 0.1-1.6% metallic ash inhibitor, and 0.1-0.5% stabilizer; The nanofillers are La@CeO2 and Fe3O4@TiO2, and the mass ratio of La@CeO2 to Fe3O4@TiO2 is 1-5:1-2.

2. The high-performance nanocomposite metallized thin film according to claim 1, characterized in that, The modified polyimide is prepared by mixing monomers 2,2-bis[4-(2,4-diaminophenoxy)phenyl]hexafluoropropane and 2,2-bis[4-(2-trifluoromethyl-4-aminophenoxy)phenyl]hexafluoropropane in a certain proportion, dissolving the mixture in an N-methylpyrrolidone solution to obtain a precursor solution, and then performing a polycondensation reaction between the precursor solution and pyromellitic dianhydride.

3. The high-performance nanocomposite metallized thin film according to claim 2, characterized in that, The mass ratio of 2,2-bis[4-(2,4-diaminophenoxy)phenyl]hexafluoropropane to 2,2-bis[4-(2-trifluoromethyl-4-aminophenoxy)phenyl]hexafluoropropane is 1-4:

1.

4. The high-performance nanocomposite metallized thin film according to claim 1, characterized in that, The interface modifier is one or more of 3-trihydroxyphenyl-1-propanesulfonic acid, silane coupling agent, or titanate coupling agent.

5. The high-performance nanocomposite metallized thin film according to claim 1, characterized in that, The antioxidant is one or more of 2,6-di-tert-butyl-4-methylphenol, tris(2,4-di-tert-butylphenyl) phosphite, and thiodipropionate.

6. The high-performance nanocomposite metallized thin film according to claim 1, characterized in that, The metal ash inhibitor is one or more of 1H-benzotriazole-1-methanol, 3-amino-5-mercapto-1,2,3-triazole, molybdate, tungstate, chromate, and indium tin oxide.

7. The high-performance nanocomposite metallized thin film according to claim 1, characterized in that, The stabilizer is one or more of 2,6-dimethyl-4-nitro-1,3,5-tricyclohexyl-2-naphthoquinone, borate ester, mercaptosuccinic acid, and dithiodisuccinic acid.

8. The method for preparing high-performance nanocomposite metallized thin films according to any one of claims 1-7, characterized in that, Includes the following steps: (1) The modified polyimide and the interface modifier are mixed to obtain the matrix; (2) The nanofiller was added to a xylene solution of maleic anhydride-grafted polyethylene and heated and stirred to obtain the nanofiller. Nanocomposite materials; (3) Grind and mix the matrix obtained in step (1), the nanocomposite material obtained in step (2), the antioxidant, the metal ash inhibitor and the stabilizer, heat and melt plasticize them and then extrude them to obtain polyimide sheets; (4) The polyimide sheet obtained in step (3) is stretched biaxially using a longitudinal stretching machine and a transverse stretching machine, and then cooled and annealed by a cooling roller to obtain a polyimide film; (5) The polyimide film obtained in step (4) is first subjected to surface roughening, activation and reduction treatment, and then micropores are formed on the surface of the polyimide film by plasma electro-erosion process. Then, a metal oxide gel solution is sprayed onto the polyimide film by vacuum spraying or ion plating film forming technology to obtain a high-efficiency nanocomposite metallized film.

9. The method for preparing high-efficiency nanocomposite metallized thin films according to claim 8, characterized in that, In step (5), the metal oxide is one of nickel oxide, titanium oxide, and tungsten oxide.

10. The application of the high-efficiency nanocomposite metallized thin film according to claim 1, characterized in that, Application of the high-efficiency nanocomposite metallized thin film in high-voltage capacitors.

Images