CN116444728B - A high-voltage and high-temperature resistant film for wind power capacitors and a preparation method thereof - Google Patents
A high-voltage and high-temperature resistant film for wind power capacitors and a preparation method thereof Download PDFInfo
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- CN116444728B CN116444728B CN202310427944.6A CN202310427944A CN116444728B CN 116444728 B CN116444728 B CN 116444728B CN 202310427944 A CN202310427944 A CN 202310427944A CN 116444728 B CN116444728 B CN 116444728B
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- 239000003990 capacitor Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 30
- 239000004743 Polypropylene Substances 0.000 claims abstract description 106
- -1 polypropylene Polymers 0.000 claims abstract description 106
- 229920001155 polypropylene Polymers 0.000 claims abstract description 106
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000000463 material Substances 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 22
- KFOZNPPBKHYHQD-UHFFFAOYSA-N ethenesulfonyl chloride Chemical compound ClS(=O)(=O)C=C KFOZNPPBKHYHQD-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000002904 solvent Substances 0.000 claims abstract description 17
- CDIDGWDGQGVCIB-UHFFFAOYSA-N 3,5-bis(trifluoromethyl)aniline Chemical compound NC1=CC(C(F)(F)F)=CC(C(F)(F)F)=C1 CDIDGWDGQGVCIB-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000003999 initiator Substances 0.000 claims abstract description 11
- 238000007334 copolymerization reaction Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims description 35
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 21
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 16
- 229910052725 zinc Inorganic materials 0.000 claims description 16
- 239000011701 zinc Substances 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 14
- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- CSDQQAQKBAQLLE-UHFFFAOYSA-N 4-(4-chlorophenyl)-4,5,6,7-tetrahydrothieno[3,2-c]pyridine Chemical compound C1=CC(Cl)=CC=C1C1C(C=CS2)=C2CCN1 CSDQQAQKBAQLLE-UHFFFAOYSA-N 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 8
- 238000010992 reflux Methods 0.000 claims description 8
- 238000009792 diffusion process Methods 0.000 claims description 7
- 238000007738 vacuum evaporation Methods 0.000 claims description 7
- 239000004342 Benzoyl peroxide Substances 0.000 claims description 6
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 claims description 6
- 235000019400 benzoyl peroxide Nutrition 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 6
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 5
- 239000000376 reactant Substances 0.000 claims description 5
- 238000001771 vacuum deposition Methods 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 238000000137 annealing Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 3
- 239000002808 molecular sieve Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 3
- 238000010025 steaming Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 238000007747 plating Methods 0.000 claims description 2
- 230000009471 action Effects 0.000 abstract description 8
- 238000006467 substitution reaction Methods 0.000 abstract description 5
- 239000012298 atmosphere Substances 0.000 abstract description 4
- 239000010408 film Substances 0.000 description 64
- 239000010410 layer Substances 0.000 description 18
- 238000012360 testing method Methods 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 229920000642 polymer Polymers 0.000 description 10
- 238000001704 evaporation Methods 0.000 description 8
- 230000008020 evaporation Effects 0.000 description 8
- 239000011247 coating layer Substances 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 238000003851 corona treatment Methods 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 125000000472 sulfonyl group Chemical group *S(*)(=O)=O 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 125000000524 functional group Chemical group 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- FRIBMENBGGCKPD-UHFFFAOYSA-N 3-(2,3-dimethoxyphenyl)prop-2-enal Chemical compound COC1=CC=CC(C=CC=O)=C1OC FRIBMENBGGCKPD-UHFFFAOYSA-N 0.000 description 1
- YIVJZNGAASQVEM-UHFFFAOYSA-N Lauroyl peroxide Chemical compound CCCCCCCCCCCC(=O)OOC(=O)CCCCCCCCCCC YIVJZNGAASQVEM-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003985 ceramic capacitor Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 208000028659 discharge Diseases 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- ZQMHJBXHRFJKOT-UHFFFAOYSA-N methyl 2-[(1-methoxy-2-methyl-1-oxopropan-2-yl)diazenyl]-2-methylpropanoate Chemical compound COC(=O)C(C)(C)N=NC(C)(C)C(=O)OC ZQMHJBXHRFJKOT-UHFFFAOYSA-N 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- 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)
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F255/00—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00
- C08F255/02—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00 on to polymers of olefins having two or three carbon atoms
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/06—Coating with compositions not containing macromolecular substances
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/02—Pretreatment of the material to be coated
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/14—Metallic material, boron or silicon
- C23C14/20—Metallic material, boron or silicon on organic substrates
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/24—Vacuum evaporation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G13/00—Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in groups H01G4/00 - H01G11/00
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
- H01G4/14—Organic dielectrics
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2351/00—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
- C08J2351/06—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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Polymers & Plastics (AREA)
- Health & Medical Sciences (AREA)
- Metallurgy (AREA)
- Medicinal Chemistry (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
本发明涉及电容薄膜技术领域，特别涉及一种风电电容器高耐压高耐温薄膜及其制备方法，该高耐压高耐温薄膜包括聚丙烯基膜层，该聚丙烯基膜层由改性聚丙烯材料制备而得。通过在惰性气氛下以无水二氯甲烷作为溶剂，在一定条件下3,5‑二(三氟甲基)苯胺和乙烯基磺酰氯发生取代反应，进一步在引发剂作用下与聚丙烯发生接枝共聚反应得到改性聚丙烯材料，且在薄膜制备过程中通过控制横纵向拉伸的预热温度和拉伸温度及拉伸倍率保证了薄膜拉伸的均匀性，使得最终制备得到薄膜具有良好的力学性能及耐高温性。The present invention relates to the technical field of capacitor films, and in particular to a high-voltage and high-temperature-resistant film for a wind power capacitor and a preparation method thereof, wherein the high-voltage and high-temperature-resistant film comprises a polypropylene-based film layer, and the polypropylene-based film layer is prepared from a modified polypropylene material. By using anhydrous dichloromethane as a solvent under an inert atmosphere, 3,5-bis(trifluoromethyl)aniline and vinylsulfonyl chloride undergo a substitution reaction under certain conditions, and further undergo a graft copolymerization reaction with polypropylene under the action of an initiator to obtain a modified polypropylene material, and in the process of preparing the film, the preheating temperature, the stretching temperature and the stretching ratio of the transverse and longitudinal stretching are controlled to ensure the uniformity of the film stretching, so that the film finally prepared has good mechanical properties and high temperature resistance.
Description
Technical Field
The invention relates to the technical field of capacitance films, in particular to a high-voltage-resistance high-temperature-resistance film of a wind power capacitor and a preparation method thereof.
Background
The existing film for the metallized capacitor is widely applied to a plurality of industries such as electronics, household appliances, communication, electric power, electrified railways, hybrid electric vehicles, wind power generation, solar power generation and the like. Capacitors have evolved from an initial simple form to today's complex devices as important energy storage devices, dielectric capacitors having higher operating voltages and power densities, longer lifetimes and greater cycling stability than batteries and electrochemical capacitors, and can be classified according to dielectric materials, ceramic capacitors, electrolytic capacitors, paper dielectric containers, polymer film capacitors, etc., with the development of advanced electronic and power systems, film capacitors with high energy storage properties have become particularly important, polymer-based materials have emerged as the primary medium of film capacitors due to their flexibility, cost effectiveness and customizable functional characteristics. The thin film capacitors are slowly and widely applied to the fields of smart grids, new energy automobiles and the like due to the advantages of high breakdown field strength, high power density, small dielectric loss, small volume, low cost and the like. However, it is difficult to increase the capacitance and the energy storage density due to the low dielectric constant, which hinders the further development of the thin film capacitor.
The China patent with the application number 201710580920.9 discloses a preparation method of a polypropylene film for a high-temperature-resistant capacitor, which comprises the steps of feeding a polypropylene raw material into an extruder for extrusion, sheet casting, bidirectional synchronous stretching and heat setting to form a film, then cooling, thickness measurement, trimming, corona treatment, rolling and secondary aging treatment to obtain the polypropylene film for the high-temperature-resistant capacitor, and the China patent with the application number 202111264985.5 discloses a bidirectional stretching polypropylene film for the capacitor, which comprises an upper surface layer, a middle layer and a lower surface layer, wherein polypropylene resin A is used as a middle layer raw material, polypropylene resin B is used as a surface layer raw material, the polypropylene raw material is respectively fed into a main extruder and a spoke double extruder for melting, sheet fluid is obtained through three-channel composite die head extrusion after plasticizing, and after sheet casting molding is carried out through a chilling roller and a high-pressure air knife, the longitudinal stretching machine and the transverse stretching machine are sequentially adopted to obtain the biaxially-stretched polypropylene film for the capacitor, and the improvement of the biaxially-stretched polypropylene film is mainly concentrated on the preparation process, and the performance of the prepared film is limited, so that research on novel dielectric materials is focused.
Disclosure of Invention
In order to solve the problems, the invention provides a high-pressure-resistance high-temperature-resistance film of a wind power capacitor and a preparation method thereof. The modified polypropylene material is prepared through substitution reaction of 3, 5-bis (trifluoromethyl) aniline and vinyl sulfonyl chloride in inert atmosphere with anhydrous dichloromethane as solvent and further graft copolymerization reaction with polypropylene in the presence of initiator. The finally prepared film has good mechanical property and high temperature resistance.
The technical scheme for solving the problems is as follows:
the high-pressure-resistance high-temperature-resistance film for the wind power capacitor comprises a polypropylene base film layer, wherein the polypropylene base film layer is prepared from a modified polypropylene material, and the preparation process of the modified polypropylene material is as follows:
S1, adding triethylamine and 3, 5-bis (trifluoromethyl) aniline into anhydrous dichloromethane serving as a solvent in an inert atmosphere, adding vinyl sulfonyl chloride into the mixture under an ice bath condition, mixing the mixture for 20-30min, then raising the temperature to 20-25 ℃, reacting the mixture for 6-8h, and then heating the mixture to reflux for 8-12h;
S2, adding polypropylene, an initiator and the reactant obtained in the step S1 into a reaction kettle, uniformly mixing, heating to a molten state to perform graft copolymerization reaction, closing stirring after reacting for 8-12h, introducing inert gas into the reaction kettle, opening a piston at the lower end of the reaction kettle, discharging, granulating after passing through a cold water tank, and obtaining the modified polypropylene material.
The isotactic polypropylene has the advantages that the isotacticity is more than or equal to 96%, the density is 0.91g/cm 2, the MFI is about 2.5g/10min, the isotactic polypropylene is the most regular in structure because methyl in a polypropylene molecular chain is distributed on one side of a main chain, the isotactic polypropylene is extremely easy to crystallize, the higher the isotactic index is, the higher the crystallinity is, the heat resistance is also increased, and the elastic modulus, the tensile strength, the bending strength and the compressive strength are also improved.
In step S1, the preparation process of the anhydrous dichloromethane comprises the steps of putting the dichloromethane into a reactor, adding calcium hydride, refluxing for 3-5 hours, steaming out, and preserving in a 4A molecular sieve, and the post-treatment process comprises the steps of stirring the residual calcium hydride in the reactor and the anhydrous ethanol at room temperature until the residual calcium hydride is completely decomposed, and pouring the mixture into a waste liquid barrel.
Further, in step S1, vinylsulfonyl chloride is added dropwise.
Further, in the step S2, the initiator is any one of benzoyl peroxide, lauroyl peroxide, azobisisobutyronitrile, azobisisoheptonitrile, dimethyl azobisisobutyrate, and cumene hydroperoxide.
Further, the inert atmosphere in the step S1 is nitrogen atmosphere or argon atmosphere, and the inert gas in the step S2 is nitrogen or argon.
The invention also provides a preparation method of the high-voltage-resistant and high-temperature-resistant film of the wind power capacitor, which comprises the following steps:
a1, conveying the prepared modified polypropylene material into a melt extruder, extruding through a die head, and conveying to a rolling structure for cooling and film pressing treatment to obtain a casting sheet with uniform thickness;
A2, carrying out preheating treatment on the cast sheet, then carrying out longitudinal stretching and transverse stretching, cooling by a cooling roller, and annealing the cooled film to obtain a polypropylene-based film layer;
and A3, pretreating the obtained polypropylene base film layer, conveying the pretreated polypropylene base film layer into a vacuum coating machine, performing vacuum evaporation on the corona surface of the polypropylene base film layer to form a zinc coating, then plating an aluminum coating on the surface of the zinc coating, and performing heating diffusion treatment to obtain the high pressure-resistant and temperature-resistant film.
Further, the cooling temperature of the cast sheet in step A1 is 20-45 ℃.
Further, the preheating temperature in the step A2 is 130-140 ℃ and the preheating time is 80-120s.
Further, in the step A2, the stretching multiplying power of the longitudinal stretching is 450-520%, the preheating temperature of the longitudinal stretching is 110-130 ℃, the stretching temperature is 85-105 ℃, the stretching multiplying power of the transverse stretching is 780-900%, the preheating temperature of the transverse stretching is 165-185 ℃, and the stretching temperature is 140-155 ℃.
Because the film has an inherent stretching ratio in the stretching process, uniform stretching can be formed only when the film is stretched to a certain multiplying power, a dead zone which is not pulled out often appears when the stretching multiplying power is too low, and the uniformity of the film is influenced, so that the uniformity of the film stretching is improved, the thickness uniformity and the surface evenness of the film are improved along with the increase of the stretching multiplying power, the longitudinal stretching of the sheet is carried out at a certain speed to enable polymer molecules to be longitudinally oriented, the preheating temperature and the stretching temperature of longitudinal stretching are controlled to be as low as possible, the stretching multiplying power is controlled to be as high as possible, the preheating temperature and the stretching temperature of transverse stretching are also controlled to be as low as possible, but the problem also occurs when the temperature is too low, and the preheating temperature of transverse stretching is controlled to be 165-185 ℃ and the stretching temperature is 140-155 ℃.
Further, the obtained polypropylene base film layer is pretreated, the obtained polypropylene base film layer is subjected to corona discharge treatment and then subjected to aging treatment, zinc metal is sent into an evaporation crucible through a conveying mechanism in the vacuum coating machine, zinc metal is changed into zinc vapor from zinc solution in the evaporation crucible, a zinc coating layer is formed on a corona surface of the polypropylene base film layer in the coating chamber by vacuum evaporation, aluminum wires are sent into the evaporation crucible, aluminum wires are changed into aluminum vapor from aluminum solution in the evaporation crucible, vacuum evaporation operation is continuously performed on the upper surface of the zinc coating layer in the coating chamber under the action of an ultrasonic generator to form an aluminum coating layer, and further heating diffusion treatment is carried out to obtain the high pressure-resistant and temperature-resistant film, wherein the heating diffusion treatment is divided into three sections, one section is heated to 42 ℃ from room temperature, the other section is heated to 12 ℃ from 42 ℃ to 90 ℃, the other section is heated to 120 ℃ from 90 ℃, and the temperature of the other section is heated to 120 ℃, so that the aluminum coating layer and the microscopic structure between the polypropylene base film layer and the polypropylene base film layer can be effectively promoted.
The invention has the following beneficial effects:
In the process of preparing the modified polypropylene material, firstly, anhydrous methylene dichloride is used as a solvent, triethylamine is used as an acid-binding agent, vinyl sulfonyl chloride is dropwise added into the modified polypropylene material under the ice bath condition, then the temperature is raised, 3, 5-bis (trifluoromethyl) aniline and the vinyl sulfonyl chloride undergo substitution reaction, and then the modified polypropylene material is obtained through graft copolymerization reaction with polypropylene under the action of an initiator, functional groups such as benzene rings, sulfonyl groups and the like are successfully introduced onto a polypropylene high molecular framework, so that the melting point is improved, the thermal stability of the polymer is improved, in addition, the oriented polarization capability of a high-polarity sulfonyl group introduced into a high molecular side chain under a high electric field can realize the regulation and control of the structure and the performance of the polymer, and the introduction of a high-energy C-F bond can enhance the thermal stability of the polymer. And the uniformity of film stretching is ensured by controlling the preheating temperature and the stretching temperature of transverse and longitudinal stretching and the stretching multiplying power in the film preparation process.
Detailed Description
The technical solutions of the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The polypropylene raw material used in the invention is purchased from Yangzi petrochemical industry Co Ltd (brand F401), the isotacticity is more than or equal to 96%, the density is 0.91g/cm 2, the MFI is approximately equal to 2.5g/10min, the triethylamine CAS number is 121-44-8, the 3, 5-bis (trifluoromethyl) aniline CAS number is 328-74-5, the dichloromethane CAS number is 75-09-2, the vinyl sulfonyl chloride CAS number is 6608-47-5, and all the reagents are commercially available.
Example 1
The high-pressure-resistance high-temperature-resistance film for the wind power capacitor comprises a polypropylene-based film layer, wherein the polypropylene-based film layer is prepared from a modified polypropylene material, and the preparation process of the modified polypropylene material is as follows:
s1, taking 50 parts by weight of anhydrous dichloromethane as a solvent under a nitrogen atmosphere, adding 18 parts by weight of triethylamine and 32 parts by weight of 3, 5-bis (trifluoromethyl) aniline into the solvent, dropwise adding 35 parts by weight of vinyl sulfonyl chloride into the solvent under an ice bath condition, mixing for 25 minutes, then raising the temperature to 25 ℃, reacting for 7 hours, and then heating to reflux reaction for 10 hours;
And S2, adding 42 parts by weight of polypropylene, 8 parts by weight of initiator benzoyl peroxide and the reactant obtained in the step S1 into a reaction kettle, uniformly mixing, heating to a molten state to perform graft copolymerization reaction, after reacting for 10 hours, closing stirring, introducing nitrogen gas into the reaction kettle, opening a piston at the lower end of the reaction kettle for discharging, and granulating after passing through a cold water tank to obtain the modified polypropylene material.
The preparation process of the anhydrous dichloromethane comprises the steps of putting the dichloromethane into a reactor, adding calcium hydride, refluxing for 5 hours, steaming out, preserving in a 4A molecular sieve, and the post-treatment process comprises the steps of adding the anhydrous ethanol into the residual calcium hydride in the reactor, stirring at room temperature until the residual calcium hydride is completely decomposed, and pouring the residual calcium hydride into a waste liquid barrel.
A preparation method of a high-voltage-resistant and high-temperature-resistant film of a wind power capacitor comprises the following steps:
A1, conveying the prepared modified polypropylene material into a melt extruder, extruding through a die head, and conveying to a rolling structure for cooling and film pressing treatment to obtain a casting sheet with uniform thickness, wherein the cooling temperature of the casting sheet is 35 ℃;
A2, carrying out longitudinal stretching and transverse stretching on the cast sheet after preheating treatment, cooling by a cooling roller, and annealing the cooled film to obtain a polypropylene-based film layer, wherein the preheating temperature is 135 ℃, the preheating time is 100s, the stretching multiplying power of longitudinal stretching is 500%, the preheating temperature of longitudinal stretching is 120 ℃, the stretching temperature is 95 ℃, the stretching multiplying power of transverse stretching is 850%, the preheating temperature of transverse stretching is 175 ℃, and the stretching temperature is 150 ℃;
A3, pre-treating the obtained polypropylene base film, carrying out corona discharge treatment on the obtained polypropylene base film, then carrying out aging treatment, sending the pre-treated polypropylene base film into a vacuum coating machine, sending zinc metal into an evaporation crucible through a conveying mechanism in the vacuum coating machine, changing zinc metal into zinc vapor from zinc solution in the evaporation crucible, carrying out vacuum evaporation operation on the corona surface of the polypropylene base film in the coating chamber to form a zinc coating layer, sending aluminum wires into the evaporation crucible, changing aluminum wires into aluminum vapor from aluminum solution in the evaporation crucible, carrying out vacuum evaporation operation on the upper surface of the zinc coating layer in the coating chamber under the action of an ultrasonic generator, and further carrying out heating diffusion treatment to obtain the high pressure-resistant and temperature-resistant film, wherein the heating diffusion treatment is divided into three sections, one section is at 4 ℃ to 42 ℃, the other section is at 12 ℃ to 90 ℃, and the other section is at 15 ℃ to 120 ℃.
Example 2
In this example, the modified polypropylene material and the high pressure and temperature resistant film were prepared under different reaction conditions as compared with example 1, and the rest of the procedure was as described in example 1.
The preparation process of the modified polypropylene material comprises the following steps:
S1, taking 65 parts by weight of anhydrous dichloromethane as a solvent under a nitrogen atmosphere, adding 25 parts by weight of triethylamine and 40 parts by weight of 3, 5-bis (trifluoromethyl) aniline into the solvent, dropwise adding 45 parts by weight of vinyl sulfonyl chloride into the solvent under an ice bath condition, mixing for 30min, then raising the temperature to 25 ℃, reacting for 8h, and then heating to reflux reaction for 12h;
And S2, adding 52 parts by weight of polypropylene, 12 parts by weight of initiator benzoyl peroxide and the reactant obtained in the step S1 into a reaction kettle, uniformly mixing, heating to a molten state to perform graft copolymerization reaction, closing stirring after reacting for 12 hours, introducing nitrogen gas into the reaction kettle, opening a piston at the lower end of the reaction kettle for discharging, and granulating after passing through a cold water tank to obtain the modified polypropylene material.
In the preparation method of the wind power capacitor high-voltage-resistant and high-temperature-resistant film, the cooling temperature of the cast sheet in the step A1 is 45 ℃, the preheating temperature in the step A2 is 140 ℃, the preheating time is 120s, the stretching multiplying power of longitudinal stretching is 520%, the preheating temperature of longitudinal stretching is 130 ℃, the stretching temperature is 105 ℃, the stretching multiplying power of transverse stretching is 900%, the preheating temperature of transverse stretching is 185 ℃, and the stretching temperature is 155 ℃.
The remainder of the procedure is as in example 1.
Example 3
In this example, the modified polypropylene material and the high pressure and temperature resistant film were prepared under different reaction conditions as compared with example 1, and the rest of the procedure was as described in example 1.
The preparation process of the modified polypropylene material comprises the following steps:
S1, taking 45 parts by weight of anhydrous dichloromethane as a solvent under a nitrogen atmosphere, adding 12 parts by weight of triethylamine and 28 parts by weight of 3, 5-bis (trifluoromethyl) aniline into the solvent, dropwise adding 32 parts by weight of vinyl sulfonyl chloride into the solvent under an ice bath condition, mixing for 20 minutes, then raising the temperature to 20 ℃, reacting for 6 hours, and then heating to reflux reaction for 8 hours;
And S2, adding 38 parts by weight of polypropylene, 6 parts by weight of initiator benzoyl peroxide and the reactant obtained in the step S1 into a reaction kettle, uniformly mixing, heating to a molten state to perform graft copolymerization reaction, closing stirring after 8 hours of reaction, introducing nitrogen gas into the reaction kettle, opening a piston at the lower end of the reaction kettle for discharging, and granulating after passing through a cold water tank to obtain the modified polypropylene material.
In the preparation method of the wind power capacitor high-voltage-resistant and high-temperature-resistant film, the cooling temperature of the cast sheet in the step A1 is 20 ℃, the preheating temperature in the step A2 is 130 ℃, the preheating time is 80s, the stretching multiplying power of longitudinal stretching is 450%, the preheating temperature of longitudinal stretching is 110 ℃, the stretching temperature is 85 ℃, the stretching multiplying power of transverse stretching is 780%, the preheating temperature of transverse stretching is 165 ℃, and the stretching temperature is 140 ℃.
The remainder of the procedure is as in example 1.
Comparative example 1
In comparison with example 1, 3, 5-bis (trifluoromethyl) aniline was not added during the preparation of the modified polypropylene material, and the rest of the procedure was referred to in example 1.
The preparation process of the modified polypropylene material comprises the steps of adding 42 parts by weight of polypropylene, 8 parts by weight of initiator benzoyl peroxide and 35 parts by weight of vinyl sulfonyl chloride into a reaction kettle, uniformly mixing, heating to a molten state to perform graft copolymerization reaction, closing stirring after reacting for 10 hours, introducing nitrogen gas into the reaction kettle, opening a piston at the lower end of the reaction kettle to discharge, granulating after passing through a cold water tank, and obtaining the modified polypropylene material.
Comparative example 2
In comparison with example 1, no vinylsulfonyl chloride was added during the preparation of the modified polypropylene material, and the rest of the procedure was as described in example 1.
The preparation process of the modified polypropylene material comprises the steps of adding 42 parts by weight of polypropylene and 32 parts by weight of 3, 5-bis (trifluoromethyl) aniline into a reaction kettle, uniformly mixing, heating to a molten state, reacting for 10 hours, closing stirring, introducing nitrogen gas into the reaction kettle, opening a piston at the lower end of the reaction kettle for discharging, granulating after passing through a cold water tank, and obtaining the modified polypropylene material.
Comparative example 3
In contrast to example 1, 3, 5-bis (trifluoromethyl) aniline and vinylsulfonyl chloride were directly mixed with polypropylene, the remainder of the procedure being as described in example 1.
The preparation process of the modified polypropylene material comprises the steps of adding 42 parts by weight of polypropylene, 32 parts by weight of 3, 5-bis (trifluoromethyl) aniline and 35 parts by weight of vinyl sulfonyl chloride into a reaction kettle, uniformly mixing, heating to a molten state, reacting for 10 hours, closing stirring, introducing nitrogen gas into the reaction kettle, opening a piston at the lower end of the reaction kettle, discharging, granulating after passing through a cold water tank, and obtaining the modified polypropylene material.
Comparative example 4
In comparison with comparative example 1, polypropylene was directly mixed with vinylsulfonyl chloride in the preparation process of the modified polypropylene material, and the rest of the process was referred to comparative example 1.
The preparation process of the modified polypropylene material comprises the steps of adding 42 parts by weight of polypropylene and 35 parts by weight of vinyl sulfonyl chloride into a reaction kettle, uniformly mixing, heating to a molten state, reacting for 10 hours, closing stirring, introducing nitrogen gas into the reaction kettle, opening a piston at the lower end of the reaction kettle, discharging, granulating after passing through a cold water tank, and obtaining the modified polypropylene material.
Correlation testing
The materials prepared in examples and comparative examples were subjected to the relevant performance test, wherein the heat shrinkage was measured after heating at 120℃for 15min, and the test results are shown in Table 1.
TABLE 1
From the above data, it can be seen that the test results of examples 1 to 3 are superior to those of comparative examples 1 to 4, wherein the test results of examples show that the prepared material has a tensile strength of 100MPa or more, a heat shrinkage (longitudinal direction) of about 0.7%, a heat shrinkage (transverse direction) of about 0.02%, and the overall performance of example 1 is better, and the reliability of use can be ensured.
The materials prepared in the examples and the comparative examples are applied to the preparation of the capacitor, all detection tests are carried out on the premise of ensuring safety, and the prepared capacitor is subjected to relevant performance tests, wherein a program-controlled voltage withstanding tester is adopted for testing breakdown strength, a radio frequency impedance material analyzer is adopted for testing dielectric constant, a radio frequency impedance material analyzer is adopted for testing dielectric loss factor, and the test results are shown in table 2.
TABLE 2
From the analysis of the above test data, the test results of examples 1 to 3 are superior to those of comparative examples 1 to 4, which shows that the grafting of 3, 5-bis (trifluoromethyl) aniline and vinylsulfonyl chloride onto polypropylene by reaction can effectively improve the comprehensive performance of polypropylene, obtain a modified polypropylene material with better comprehensive performance, and contribute to improvement of the dielectric constant and breakdown strength of the film.
Polypropylene film capacitors have many excellent characteristics as an important electronic component, but with the development of the electronic/electric industry, films made of polypropylene have difficulty in increasing the specific capacity and energy storage density of the film capacitors due to low dielectric constant. Compared with the prior art, the modified polypropylene material is prepared by modifying polypropylene, and the high pressure-resistant and temperature-resistant film with better comprehensive performance is further prepared. In the process of preparing the modified polypropylene material, firstly, anhydrous methylene dichloride is used as a solvent, triethylamine is used as an acid-binding agent, vinyl sulfonyl chloride is dripped into the modified polypropylene material under the ice bath condition, then the temperature is raised, 3, 5-bis (trifluoromethyl) aniline and the vinyl sulfonyl chloride undergo substitution reaction, and then the modified polypropylene material is obtained through graft copolymerization reaction with polypropylene under the action of an initiator, functional groups such as benzene rings and sulfonyl groups are successfully introduced onto a polypropylene high molecular skeleton, the introduction of a cyclic structure can increase the rigidity of a molecular chain, the thermal movement of molecules is weakened, the introduction of the cyclic structure can reduce single bonds as much as possible, thereby the melting point is improved, the thermal stability of the polymer is improved, meanwhile, the polypropylene raw material selected by the invention is isotactic polypropylene, the structure is most regular, the crystallinity is higher, the high crystallinity is also favorable for improving the thermal stability of the polymer, the elastic modulus, the stretching and the bending and the compression strength are also improved, in the invention, in addition, the high polar sulfonyl groups are introduced into a high-side chain, the orientation capacity of the high polar functional groups under high electric field can realize the orientation of the polymer, the dipole-structure and the dipole-structure of the high-SO- 2 can further realize the thermal stability of the polar structure of the polymer, and the thermal stability of the polar structure of the side chains can be further regulated and the thermal stability of the dipole- 2 is further can be improved.
In the film preparation process, the preheating temperature and the stretching temperature of longitudinal stretching are controlled to be as low as possible, the stretching multiplying power is as high as possible, so that polymer molecules are longitudinally oriented, the preheating temperature and the stretching temperature of transverse stretching are also as low as possible, the obtained polypropylene base film layer is firstly subjected to corona discharge treatment and then to failure treatment, the pretreated polypropylene base film layer is subjected to vacuum evaporation and temperature rising diffusion treatment, and the high pressure-resistant and temperature-resistant film is obtained.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The high-pressure-resistance high-temperature-resistance film for the wind power capacitor comprises a polypropylene base film layer and is characterized in that the polypropylene base film layer is prepared from a modified polypropylene material, and the preparation process of the modified polypropylene material is as follows:
s1, taking 50 parts by weight of anhydrous dichloromethane as a solvent under a nitrogen atmosphere, adding 18 parts by weight of triethylamine and 32 parts by weight of 3, 5-bis (trifluoromethyl) aniline into the solvent, dropwise adding 35 parts by weight of vinyl sulfonyl chloride into the solvent under an ice bath condition, mixing for 25 minutes, then raising the temperature to 25 ℃, reacting for 7 hours, and then heating to reflux reaction for 10 hours;
S2, adding 42 parts by weight of polypropylene, 8 parts by weight of initiator benzoyl peroxide and the reactant obtained in the step S1 into a reaction kettle, uniformly mixing, heating to a molten state, performing graft copolymerization reaction, after reacting for 10 hours, closing stirring, introducing nitrogen gas into the reaction kettle, opening a piston at the lower end of the reaction kettle, discharging, granulating after passing through a cold water tank, and obtaining a modified polypropylene material;
the preparation process of the anhydrous dichloromethane comprises the steps of putting the dichloromethane into a reactor, adding calcium hydride, refluxing for 5 hours, steaming out, preserving in a 4A molecular sieve, and the post-treatment process comprises the steps of adding the anhydrous ethanol into the residual calcium hydride in the reactor, stirring at room temperature until the residual calcium hydride is completely decomposed, and pouring the residual calcium hydride into a waste liquid barrel.
2. The preparation method of the high-voltage-resistant and high-temperature-resistant film of the wind power capacitor as claimed in claim 1, which is characterized by comprising the following steps:
a1, conveying the prepared modified polypropylene material into a melt extruder, extruding through a die head, and conveying to a rolling structure for cooling and film pressing treatment to obtain a casting sheet with uniform thickness;
A2, carrying out preheating treatment on the cast sheet, then carrying out longitudinal stretching and transverse stretching, cooling by a cooling roller, and annealing the cooled film to obtain a polypropylene-based film layer;
and A3, pretreating the obtained polypropylene base film layer, conveying the pretreated polypropylene base film layer into a vacuum coating machine, performing vacuum evaporation on the corona surface of the polypropylene base film layer to form a zinc coating, then plating an aluminum coating on the surface of the zinc coating, and performing heating diffusion treatment to obtain the high pressure-resistant and temperature-resistant film.
3. The method for preparing the high-voltage-resistant and high-temperature-resistant film of the wind power capacitor, which is disclosed in claim 2, is characterized in that the cooling temperature of the cast sheet in the step A1 is 20-45 ℃.
4. The method for preparing the high-voltage-resistant and high-temperature-resistant film of the wind power capacitor as claimed in claim 2, wherein the preheating temperature in the step A2 is 130-140 ℃ and the preheating time is 80-120s.
5. The method for preparing the wind power capacitor high-voltage-resistant and high-temperature-resistant film according to claim 2, wherein the stretching ratio of longitudinal stretching in the step A2 is 450-520%, the preheating temperature of longitudinal stretching is 110-130 ℃, the stretching temperature is 85-105 ℃, the stretching ratio of transverse stretching is 780-900%, the preheating temperature of transverse stretching is 165-185 ℃ and the stretching temperature is 140-155 ℃.
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