CN120015519B - A high-temperature resistant metal polypropylene film capacitor and its preparation method - Google Patents
A high-temperature resistant metal polypropylene film capacitor and its preparation methodInfo
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- CN120015519B CN120015519B CN202510452328.5A CN202510452328A CN120015519B CN 120015519 B CN120015519 B CN 120015519B CN 202510452328 A CN202510452328 A CN 202510452328A CN 120015519 B CN120015519 B CN 120015519B
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- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
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- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
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- C23C14/14—Metallic material, boron or silicon
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- H01G13/00—Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in groups H01G4/00 - H01G11/00
- H01G13/02—Machines for winding capacitors
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- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
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- H01G4/32—Wound capacitors
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- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/33—Thin- or thick-film capacitors (thin- or thick-film circuits; capacitors without a potential-jump or surface barrier specially adapted for integrated circuits, details thereof, multistep manufacturing processes therefor)
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- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
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- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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- C08J2451/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2451/06—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
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- C08K3/22—Oxides; Hydroxides of metals
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- C08K2003/2241—Titanium dioxide
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Abstract
The invention relates to the technical field of capacitors and discloses a metal polypropylene film capacitor with high temperature resistance and a preparation method thereof, wherein the metal polypropylene film is formed on an aluminized layer on the surface of a biaxially-oriented polypropylene composite film by a sputtering coating process, and the biaxially-oriented polypropylene composite film contains a crosslinking modified material and a modified nano filler, can interact with a compatilizer maleic anhydride grafted polypropylene in a high-temperature melting process, and form a crosslinked network structure entangled with isotactic polypropylene molecular chains, so that the advantages of the crosslinked network structure and the crosslinked network structure can be effectively exerted, the prepared biaxially-oriented polypropylene film has excellent temperature resistance, good mechanical property and dielectric property, and the finally prepared capacitor can keep a stable working state in a high-temperature environment.
Description
Technical Field
The invention relates to the technical field of capacitors, in particular to a metal polypropylene film capacitor with high temperature resistance and a preparation method thereof.
Background
The film capacitor is an electrostatic energy storage capacitor, has higher energy density and reliability and unique self-healing characteristic, and is widely applied to various fields such as power systems, pulse power, automobile electronics, power equipment, aerospace and the like. Biaxially oriented polypropylene film capacitors have been rapidly developed in recent years because of their excellent insulating properties. The reflow soldering process adopted in the welding process of the film capacitor can lead the capacitor to go through a section of high-temperature process, and the heat dissipation condition is poor because the volume of the film capacitor is smaller and the stacking density in unit space is higher, so that the biaxially oriented polypropylene used in the film capacitor is required to have good temperature resistance, otherwise, the biaxially oriented polypropylene film performance is degraded under the high-temperature condition, so that the energy storage density of the capacitor is directly reduced seriously, and even faults and potential safety hazards occur.
In order to solve the problem of poor temperature resistance of the polypropylene film, for example, patent publication No. CN111564312B discloses a polypropylene film for a high temperature resistant capacitor and a preparation method thereof, wherein a high temperature resistant layer is linked on one side surface of a polypropylene base film, and a weather resistant layer is plated on the other side surface of the polypropylene base film. In addition, the crystallization degree of the polypropylene can be improved by adjusting the formula, for example, by adding an alpha nucleating agent, so that the density of the polypropylene is improved and the temperature resistance of the polypropylene film is improved, however, the mechanical property and the processing property of the polypropylene are affected by the addition of the nucleating agent, and the actual application is not facilitated.
Based on the above, the biaxially oriented polypropylene composite film provided by the invention can be directly used for manufacturing metal polypropylene film capacitors and has good high temperature resistance.
Disclosure of Invention
In order to solve the problems mentioned in the background art, the invention aims to provide a metal polypropylene film capacitor with high temperature resistance and a preparation method thereof.
The aim of the invention can be achieved by the following technical scheme:
A preparation method of a metal polypropylene film capacitor with high temperature resistance comprises the following steps:
fixing the biaxially oriented polypropylene composite film in a vacuum coating machine, and then adopting a sputtering coating process to form an aluminum metal layer with the thickness of 0.2-0.5 mu m on the surface of the biaxially oriented polypropylene composite film to form a metal polypropylene film;
secondly, cutting the metal polypropylene film into films with preset widths, winding the films into capacitor cores through a winding machine, and then performing metal spraying on the end surface of the capacitor cores by using a metal spraying machine;
Thirdly, after metal spraying is finished, detecting the capacitor core by using an energized machine, and then welding the capacitor core and a lead wire by using a reflow soldering process to form a core group;
and fourthly, assembling the core into a shell to form a capacitor, and then packaging, polishing, cleaning and spraying paint the capacitor to form the metal polypropylene film capacitor.
A metal polypropylene film capacitor with high temperature resistance is prepared by the preparation method.
As a further scheme of the invention, in the first step, the biaxially oriented polypropylene composite film is prepared from the following raw materials in parts by weight:
65-75 parts of isotactic polypropylene;
2.5-4 parts of crosslinking modified material;
0.5-1 part of modified nano filler;
10-15 parts of maleic anhydride grafted polypropylene;
0.5-1.5 parts of antioxidant;
1-2 parts of calcium stearate;
The preparation method of the biaxially oriented polypropylene composite film comprises the following steps:
S1, preparing the raw materials of all the components in parts by weight, uniformly mixing the raw materials in a mixer, and feeding the mixture into a double-screw extruder for extrusion granulation to form master batches;
S2, placing the master batch in an extruder, setting the temperature of the extruder to be 220-240 ℃ and the temperature of a machine head to be 220-230 ℃, melting, and casting the cast sheet to form a polypropylene cast sheet;
s3, placing the cast sheet in a clamp of a biaxial stretching device, longitudinally stretching, transversely stretching, forming, keeping loose, performing heat setting treatment at 160-170 ℃, and finally curing at room temperature for 30min to obtain the biaxial stretching polypropylene composite film.
As a further scheme of the invention, the preparation method of the crosslinking modified material is as follows:
adding 2, 5-furandicarboxylic acid and tetrahydrofuran into a reactor filled with nitrogen, stirring to form uniform liquid phases, adding a phase transfer catalyst into the reactor, heating to maintain the temperature at 60-65 ℃ after adding, slowly dripping epoxidized soybean oil into the reactor, continuously stirring for 6-9h after adding, evaporating to remove the solvent, cooling and discharging to obtain the crosslinking modified material.
Specifically, a phase transfer catalyst is used for catalyzing substituted carboxyl in a 2, 5-furandicarboxylic acid structure and epoxy groups in an epoxy soybean oil structure to carry out ring-opening esterification reaction, and continuous bridging connection can be carried out between the substituted carboxyl and the epoxy groups by controlling the dosage of the substituted carboxyl and the epoxy groups, so that a polymerized material with soybean oil and furan heterocycle alternating chain links, namely a crosslinking modified material, is formed.
As a further scheme of the invention, the molar ratio of the 2, 5-furandicarboxylic acid to the epoxidized soybean oil is 1-1.5:1.
As a further aspect of the present invention, the phase transfer catalyst is at least one of tetrabutylammonium bisulfate, tetrabutylammonium bromide, tetrabutylammonium chloride, tetramethylammonium bromide, or N, N-dimethylbenzylamine.
As a further aspect of the present invention, the preparation method of the modified nanofiller is as follows:
S10, ultrasonically dispersing nano titanium dioxide in chloroform, adding diacyl chloride into the dispersion liquid, adding pyridine as a catalyst, stirring for 3-6 hours at a temperature of 55-60 ℃ after the addition, and centrifuging the nano material to obtain acyl chloride modified nano titanium dioxide;
s20, mixing acyl chloride modified nano titanium dioxide with acetone, performing ultrasonic treatment to form a uniform dispersion liquid, adding polyether amine into the dispersion liquid, stirring and mixing for 2-4 hours at room temperature after the addition, and centrifuging to obtain a solid material, thus obtaining the modified nano filler.
Specifically, the surface of the nano titanium dioxide contains reactive active hydroxyl groups, can be condensed with acyl chloride groups at one end of a diacyl chloride structure to form acyl chloride modified nano titanium dioxide, and the modified nano filler is finally prepared by further modifying the acyl chloride modified nano titanium dioxide by using polyether amine as a modifier and utilizing the high reactivity of terminal primary amine groups in the structure.
As a further aspect of the present invention, in step S10, the diacid chloride is any one of succinyl chloride, glutaryl chloride and adipoyl chloride.
As a further aspect of the present invention, in step S20, the polyetheramine has a number average molecular weight of 1000.
As a further scheme of the invention, the antioxidant is at least one of antioxidant 1010, antioxidant 1076 or antioxidant 168.
The invention has the beneficial effects that (1) the cross-linked modified material structure prepared by the invention contains a large number of substituted hydroxyl groups generated by ring opening esterification reaction, and can interact with compatilizer maleic anhydride grafted polypropylene in the high-temperature melting process, so that a cross-linked network structure entangled with isotactic polypropylene molecular chains can be formed, on one hand, the network structure has positive effect on the improvement of isotactic polypropylene molecular chain density, thereby being beneficial to keeping the structure stability of the finally prepared biaxially oriented polypropylene composite film under the high-temperature condition. In addition, the rich furan heterocycle structure contained in the crosslinked modified material structure is rigid, so that the temperature resistance of the polypropylene film can be improved, deep traps can be generated in the polypropylene film due to the existence of furan rings, and the jump conductance of carriers is limited, so that the high temperature resistance of the polypropylene film is further improved, and the polypropylene film can be kept in a stable working state in a high-temperature environment.
(2) The modified nano filler prepared by the invention has the advantages that the surface of the modified nano filler contains a large number of polyether amine molecular chains, primary amine in the polyether amine molecular chains can interact with a compatilizer under the melting condition, so that nano titanium dioxide is inserted into a polypropylene film in a chemical crosslinking point mode, on one hand, the nano titanium dioxide can be highly combined with the polypropylene film in the mode, the problem of interface caused by mismatch of dielectric constants between the nano titanium dioxide with a wide forbidden band and polypropylene is solved, the advantages of the nano titanium dioxide can be effectively utilized, the conductivity loss of the polypropylene film under the high temperature condition is reduced, the electric field distortion is weakened, the dielectric constants and the breakdown field intensity of the polypropylene film are improved, and the finally prepared capacitor has higher energy density. On the other hand, the nano titanium dioxide in the form of chemical crosslinking points can also effectively improve the mechanical properties of the polypropylene film.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is an infrared analysis of a crosslinked modified material.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example one preparation of a crosslinking modified Material
Adding 0.5g of 2, 5-furandicarboxylic acid and tetrahydrofuran into a reactor filled with nitrogen, stirring, adding 0.2g of tetrabutylammonium bromide into the reactor after forming uniform liquid phases, heating, maintaining the temperature at 65 ℃ after adding, slowly dripping 3.1g of epoxidized soybean oil into the reactor, continuously stirring for 8 hours after adding, evaporating to remove the solvent, cooling and discharging to obtain the crosslinking modified material.
The potassium bromide tabletting method is used for preparing the crosslinking modified material into a test sample, and infrared test is carried out, and the result is shown in figure 1, wherein the absorption peak at 3401cm < -1 > is a characteristic absorption peak of hydroxyl, the absorption peak at 3000cm < -1 > to 3100cm < -1 > is a C-H characteristic absorption peak of unsaturated carbon-carbon double bonds in furan rings, and the absorption peak at 1747cm < -1 > is an ester group C=O characteristic absorption peak generated by ring opening esterification reaction.
The preparation method of the modified nano filler is as follows:
S10, dispersing 1.5g of nano titanium dioxide in chloroform by ultrasonic, adding 2.4g of adipoyl chloride into the dispersion liquid, adding 0.2g of pyridine as a catalyst, stirring for 4 hours at 60 ℃ after the addition, and centrifuging the nano material to obtain the acyl chloride modified nano titanium dioxide;
S20, mixing 1.2g of acyl chloride modified nano titanium dioxide with acetone, performing ultrasonic treatment to form a uniform dispersion liquid, adding 4.5g of polyether amine with the number average molecular weight of 1000 into the dispersion liquid, stirring and mixing for 3 hours at room temperature after the addition, and centrifuging out a solid material to obtain the modified nano filler.
Mixing the sample with a HCl standard solution with the concentration of T (mL) of C1, carrying out ultrasonic treatment for 30min, standing for 1h, taking 5mL of dispersion, mixing with 5mL of deionized water, adding 0.02mL of phenolphthalein as an indicator, titrating with a NaOH standard solution with the concentration of C2, stopping when the dispersion changes color, recording the consumption Ws (mL) of the NaOH standard solution, and calculating the amino content by using a formula (T multiplied by C1-4 multiplied by C2 multiplied by Ws)/M, wherein the measurement result is 4.518mmol/g.
Example III preparation of biaxially oriented Polypropylene composite film
S1, placing 65 parts of isotactic polypropylene, 2.5 parts of the crosslinking modified material prepared in the example 1, 0.5 part of the modified nano filler prepared in the example 2, 10 parts of maleic anhydride grafted polypropylene, 0.5 part of antioxidant 1010 and 1 part of calcium stearate into a mixer, uniformly mixing, feeding into a double-screw extruder, extruding and granulating, and controlling the temperature of each region to be 190 ℃, 200 ℃, 220 ℃, 230 ℃, 240 ℃, 230 ℃ and 300rpm, so as to form master batches;
S2, placing the master batch in an extruder, setting the melting temperature of the extruder to be 220 ℃, setting the temperature of a machine head to be 220 ℃, melting, and casting a cast sheet to form a polypropylene cast sheet with the thickness of 0.5 mm;
S3, placing the cast sheet in a clamp of a biaxial stretching device, controlling the temperature to be 160 ℃, the stretching rate to be 100%/S, the stretching multiplying power to be 5 times, firstly stretching longitudinally, then stretching transversely, keeping relaxation after forming, performing heat setting treatment at 160 ℃, and finally curing at room temperature for 30min to obtain the biaxial stretching polypropylene composite film.
Example IV preparation of biaxially oriented Polypropylene composite film
S1, placing 70 parts of isotactic polypropylene, 3.5 parts of the crosslinking modified material prepared in the example 1, 0.8 part of the modified nano filler prepared in the example 2, 12 parts of maleic anhydride grafted polypropylene, 1 part of antioxidant 1010 and 1.5 parts of calcium stearate into a mixer, uniformly mixing, feeding into a double-screw extruder, extruding and granulating, and controlling the temperature of each region to be 190 ℃, 200 ℃, 220 ℃, 230 ℃, 240 ℃, 230 ℃ and 300rpm, so as to form master batches;
S2, placing the master batch in an extruder, setting the melting temperature of the extruder to be 230 ℃ and the temperature of a machine head to be 220 ℃, melting, and casting a cast sheet to form a polypropylene cast sheet with the thickness of 0.5 mm;
S3, placing the cast sheet in a clamp of a biaxial stretching device, controlling the temperature to be 160 ℃, the stretching rate to be 100%/S, the stretching multiplying power to be 5 times, firstly stretching longitudinally, then stretching transversely, keeping relaxation after forming, performing heat setting treatment at 165 ℃, and finally curing at room temperature for 30min to obtain the biaxial stretching polypropylene composite film.
Fifth embodiment of preparing biaxially oriented Polypropylene composite film
S1, uniformly mixing 75 parts of isotactic polypropylene, 4 parts of the crosslinking modified material prepared in the embodiment 1,1 part of the modified nano filler prepared in the embodiment 2, 15 parts of maleic anhydride grafted polypropylene, 1.5 parts of antioxidant 1010 and 2 parts of calcium stearate in a mixer, feeding the mixture into a double-screw extruder for extrusion granulation, and controlling the temperature of each area to be 190 ℃, 200 ℃, 220 ℃, 230 ℃, 240 ℃, 230 ℃ and 220 ℃ and the screw rotation speed to be 300rpm to form master batches;
S2, placing the master batch in an extruder, setting the melting temperature of the extruder to be 240 ℃ and the temperature of a machine head to be 230 ℃, melting, and casting a cast sheet to form a polypropylene cast sheet with the thickness of 0.5 mm;
S3, placing the cast sheet in a clamp of a biaxial stretching device, controlling the temperature to be 160 ℃, the stretching rate to be 100%/S, the stretching multiplying power to be 5 times, firstly stretching longitudinally, then stretching transversely, keeping relaxation after forming, performing heat setting treatment at 170 ℃, and finally curing at room temperature for 30min to obtain the biaxial stretching polypropylene composite film.
Comparative example 1
The biaxially oriented polypropylene composite film prepared in this comparative example was different from example 4 in that the crosslinking modifier in the raw material was removed and the rest was unchanged.
Comparative example 2
The biaxially oriented polypropylene composite film prepared in this comparative example is different from example 4 in that the modified nanofiller in the raw material was removed and the rest was unchanged.
Comparative example 3
The biaxially oriented polypropylene composite film prepared in this comparative example is different from example 4 in that the modified nanofiller in the raw material is replaced with nano titanium dioxide, and the rest is unchanged.
Test case
(A) The biaxially oriented polypropylene composite films of examples 3 to 5 and comparative examples 1 to 3 were tested for tensile strength according to standard GB/T1040.3-2006;
(B) The breakdown strength was tested according to standard GB/T13542.2-2021;
(C) Using a WK65120B type high-precision impedance analyzer to test the dielectric constant;
The results are recorded in table 1;
TABLE 1 test results
As shown in the results of Table 1, the biaxially oriented polypropylene composite film prepared by the components containing the crosslinking modification material and the modified nano filler has better comprehensive properties such as mechanical property, breakdown strength and temperature resistance, and the compatibility problem is obvious after the nano titanium dioxide which is not subjected to surface modification is adopted to replace the modified nano filler, and the nano titanium dioxide cannot efficiently exert the advantages of the nano titanium dioxide due to poor interfacial binding force, so that the performance of each property is poor.
The biaxially oriented polypropylene composite film of example 4 of the present invention was used to prepare a metal polypropylene film capacitor, the preparation method was as follows:
Fixing a biaxially oriented polypropylene composite film in a vacuum coating machine, and then adopting a sputtering coating process to control the heating current of an aluminum evaporator evaporation boat to 80A, controlling the aluminum feeding speed to 500mm/min, and forming an aluminum metal layer with the thickness of 0.2 mu m on the surface of the aluminum metal layer to form a metal polypropylene film;
secondly, cutting the metal polypropylene film into films with preset widths, winding the films into capacitor cores through a winding machine, and then performing metal spraying on the end surface of the capacitor cores by using a metal spraying machine;
Thirdly, after metal spraying is finished, detecting the capacitor core by using an energized machine, and then welding the capacitor core and a lead wire by using a reflow soldering process to form a core group;
and fourthly, assembling the core into a shell to form a capacitor, and then packaging, polishing, cleaning and spraying paint the capacitor to form the metal polypropylene film capacitor.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to aid in understanding the method of the invention and its core concept, including the best mode, and also to enable any person skilled in the art to practice the invention, including making and using any devices or systems and performing any incorporated methods. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims. The scope of the patent protection is defined by the claims and may include other embodiments that occur to those skilled in the art. Such other embodiments are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal language of the claims.
Claims (7)
1. The preparation method of the metal polypropylene film capacitor with the high temperature resistance is characterized by comprising the following steps of:
fixing the biaxially oriented polypropylene composite film in a vacuum coating machine, and then adopting a sputtering coating process to form an aluminum metal layer with the thickness of 0.2-0.5 mu m on the surface of the biaxially oriented polypropylene composite film to form a metal polypropylene film;
secondly, cutting the metal polypropylene film into films with preset widths, winding the films into capacitor cores through a winding machine, and then performing metal spraying on the end surface of the capacitor cores by using a metal spraying machine;
Thirdly, after metal spraying is finished, detecting the capacitor core by using an energized machine, and then welding the capacitor core and a lead wire by using a reflow soldering process to form a core group;
Fourthly, assembling the core into a shell to form a capacitor, and then packaging, polishing, cleaning and spraying paint the capacitor to form the metal polypropylene film capacitor;
The biaxially oriented polypropylene composite film is prepared from the following raw materials in parts by weight:
65-75 parts of isotactic polypropylene;
2.5-4 parts of crosslinking modified material;
0.5-1 part of modified nano filler;
10-15 parts of maleic anhydride grafted polypropylene;
0.5-1.5 parts of antioxidant;
1-2 parts of calcium stearate;
The preparation method of the biaxially oriented polypropylene composite film comprises the following steps:
S1, preparing the raw materials of all the components in parts by weight, uniformly mixing the raw materials in a mixer, and feeding the mixture into a double-screw extruder for extrusion granulation to form master batches;
S2, placing the master batch in an extruder, setting the temperature of the extruder to be 220-240 ℃ and the temperature of a machine head to be 220-230 ℃, melting, and casting the cast sheet to form a polypropylene cast sheet;
S3, placing the cast sheet in a clamp of a biaxial stretching device, longitudinally stretching, transversely stretching, forming, keeping loose, performing heat setting treatment at 160-170 ℃, and finally curing at room temperature for 30min to obtain the biaxial stretching polypropylene composite film;
the crosslinking modified material is prepared by branching polymerization of 2, 5-furandicarboxylic acid and epoxidized soybean oil under the catalysis of a phase transfer catalyst;
The preparation method of the modified nano-filler is as follows:
s10, firstly, performing surface modification on nano titanium dioxide by using diacyl chloride to form acyl chloride modified nano titanium dioxide;
S20, further modifying the acyl chloride modified nano titanium dioxide by using polyether amine to prepare the modified nano filler.
2. The method for manufacturing a high temperature resistant property metal polypropylene film capacitor according to claim 1, wherein the molar ratio of the 2, 5-furandicarboxylic acid to the epoxidized soybean oil is 1-1.5:1.
3. The method for manufacturing a high temperature resistant metallic polypropylene film capacitor according to claim 1, wherein the phase transfer catalyst is at least one of tetrabutylammonium bisulfate, tetrabutylammonium bromide, tetrabutylammonium chloride, tetramethylammonium bromide or N, N-dimethylbenzylamine.
4. The method for manufacturing a metal polypropylene film capacitor having high temperature resistance according to claim 1, wherein in step S10, the diacid chloride is any one of succinyl chloride, glutaryl chloride and adipoyl chloride.
5. The method for manufacturing a high temperature resistant metal polypropylene film capacitor according to claim 1, wherein in step S20, the polyetheramine has a number average molecular weight of 1000.
6. The method for manufacturing a high temperature resistant property metal polypropylene film capacitor according to claim 1, wherein the antioxidant is at least one of antioxidant 1010, antioxidant 1076 or antioxidant 168.
7. A metal polypropylene film capacitor having high temperature resistance, which is produced by the production method according to claim 1.
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| CN110164691A (en) * | 2019-05-06 | 2019-08-23 | 艾华新动力电容(苏州)有限公司 | A kind of high moisture-proof metalizing polypropylene thin film capacitor and its processing method |
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| JP6874373B2 (en) * | 2015-05-12 | 2021-05-19 | 東レ株式会社 | Polypropylene film, metal film laminated film and film capacitor and their manufacturing method |
| KR102883065B1 (en) * | 2019-01-04 | 2025-11-07 | 셀가드 엘엘씨 | Polyimide coated separator for lithium batteries or capacitors |
| CN113817268B (en) * | 2021-10-09 | 2022-11-01 | 四川大学 | Polypropylene capacitor film and preparation method thereof |
| CN117567829A (en) * | 2022-08-08 | 2024-02-20 | 中国石油化工股份有限公司 | Modified polypropylene composition, biaxially oriented polypropylene film and application and polypropylene capacitor film |
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