CN118507253A - Preparation method of internal series connection net-shaped explosion-proof zinc-aluminum film for extra-high voltage capacitor - Google Patents
Preparation method of internal series connection net-shaped explosion-proof zinc-aluminum film for extra-high voltage capacitor Download PDFInfo
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- CN118507253A CN118507253A CN202410979703.7A CN202410979703A CN118507253A CN 118507253 A CN118507253 A CN 118507253A CN 202410979703 A CN202410979703 A CN 202410979703A CN 118507253 A CN118507253 A CN 118507253A
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- 239000003990 capacitor Substances 0.000 title claims abstract description 101
- 229910000611 Zinc aluminium Inorganic materials 0.000 title claims abstract description 37
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000000758 substrate Substances 0.000 claims abstract description 21
- 239000002131 composite material Substances 0.000 claims abstract description 13
- 238000007639 printing Methods 0.000 claims abstract description 10
- 230000001681 protective effect Effects 0.000 claims abstract description 10
- -1 polypropylene Polymers 0.000 claims abstract description 8
- 239000003973 paint Substances 0.000 claims abstract description 7
- 239000004743 Polypropylene Substances 0.000 claims abstract description 5
- 229920001155 polypropylene Polymers 0.000 claims abstract description 5
- 238000007788 roughening Methods 0.000 claims abstract description 5
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 229910052751 metal Inorganic materials 0.000 claims description 33
- 239000002184 metal Substances 0.000 claims description 33
- 238000000034 method Methods 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- 238000012546 transfer Methods 0.000 claims description 9
- 239000007800 oxidant agent Substances 0.000 claims description 6
- 230000001590 oxidative effect Effects 0.000 claims description 6
- 210000003462 vein Anatomy 0.000 claims description 6
- 238000009833 condensation Methods 0.000 claims description 5
- 230000005494 condensation Effects 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000001704 evaporation Methods 0.000 claims description 5
- 230000008020 evaporation Effects 0.000 claims description 5
- 229920002545 silicone oil Polymers 0.000 claims description 5
- 230000003746 surface roughness Effects 0.000 claims description 5
- 238000007751 thermal spraying Methods 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000003921 oil Substances 0.000 claims 2
- 239000010726 refrigerant oil Substances 0.000 claims 1
- 230000015556 catabolic process Effects 0.000 abstract description 21
- 238000002955 isolation Methods 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 29
- 239000012528 membrane Substances 0.000 description 10
- 230000006872 improvement Effects 0.000 description 9
- 230000008602 contraction Effects 0.000 description 3
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004734 Polyphenylene sulfide Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000001066 destructive effect Effects 0.000 description 2
- 229920006289 polycarbonate film Polymers 0.000 description 2
- 229920006267 polyester film Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920000069 polyphenylene sulfide Polymers 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
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- 230000010287 polarization Effects 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
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- 230000008719 thickening Effects 0.000 description 1
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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
- H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
- H01G2/14—Protection against electric or thermal overload
- H01G2/16—Protection against electric or thermal overload with fusing elements
-
- 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
-
- 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
- H01G4/005—Electrodes
-
- 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)
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
The invention relates to the technical field of capacitor films, in particular to a preparation method of an internal series connection reticular explosion-proof zinc-aluminum film for an extra-high voltage capacitor. Which comprises the following steps: preparing a polypropylene raw material into a film, and roughening the surface of the film to generate a base film; after a conductive layer is attached to a substrate film, insulating paint is smeared to form a composite capacitor film layer; printing the composite capacitance film layer pattern to generate an internal serial capacitance film; after a protective oil film is formed on the surface, the capacitor explosion-proof film is produced by cutting. According to the invention, the capacitor is divided into the insulating isolation strips with the small units and the micro fuses connected with the small capacitor units, when overvoltage breakdown occurs, only the micro fuses around the small units at the breakdown position are fused, the parent capacitor keeps working normally, and the micro fuses limit the breakdown current, so that high temperature which can influence the operation of adjacent films is not generated, and the influence of the high temperature on the capacitor film during overvoltage breakdown and breakdown is reduced.
Description
Technical Field
The invention relates to the technical field of capacitor films, in particular to a preparation method of an internal series connection reticular explosion-proof zinc-aluminum film for an extra-high voltage capacitor.
Background
The capacitor film is generally referred to as an organic film capacitor, which is a capacitor made of a dielectric material such as a polypropylene film, a polyester film (PET), a polyphenylene sulfide film (PPS), a polycarbonate film (PC), a polyphenylene naphthalene film (PEN), a polyvinylidene fluoride film (PVDF), and is one of electronic components having excellent performance, a large variety, and a wide application range.
At present, the manufacturing method of the high-temperature and high-humidity resistant safety film comprises the following steps: s1, preprocessing; s2, polarization treatment; s3, shielding treatment; s4, metallization treatment; s5, processing a protective oil film; s6, post-processing; according to the invention, the film is treated by the pretreatment device, and then the protective oil layer is subjected to proper crosslinking treatment by the post-treatment device, so that a protective oil film is formed, and the protective oil film has better explosion resistance, but when overvoltage breakdown occurs in the use of the capacitor film, the breakdown point on the capacitor film is damaged by a circuit structure, and the capacitor film is expanded and deformed due to high temperature generated during breakdown, so that the use effect of the capacitor film is affected.
In order to reduce overvoltage breakdown and the influence of high temperature on a capacitor film during breakdown, a preparation method of an internal series connection net-shaped explosion-proof zinc-aluminum film for an extra-high voltage capacitor is provided.
Disclosure of Invention
In view of the above analysis, the embodiment of the invention aims to provide a preparation method of an internal series connection reticular explosion-proof zinc-aluminum film for an extra-high voltage capacitor, so as to solve the problems in the background technology.
In order to achieve the above purpose, the invention provides a preparation method of an internal series connection net-shaped explosion-proof zinc-aluminum film for an extra-high voltage capacitor, which comprises the following steps:
s1, casting a polypropylene raw material into a film through melt extrusion, and roughening the surface of the film to generate a substrate film;
s2, after a conductive layer is attached to the surface of the substrate film, coating an insulating paint on the surface of the conductive layer to form a composite capacitor film layer;
S3, performing pattern printing on the surface of the composite capacitor film layer to generate an internal serial capacitor film with a grid-shaped metal conductive structure;
S4, after silicone oil is coated on the surface of the capacitor diaphragm to form a protective oil film, cutting is carried out to generate the capacitor explosion-proof film with the specified shape.
As a further improvement of the technical scheme, in the step S1, the roughening treatment is to introduce an oxidant into the surface of the film, the oxidation reaction of the surface of the film is initiated by the oxidant, the roughness of the surface of the film is improved, and the surface roughness range of the substrate film is 30-80 mu m.
As a further improvement of the technical scheme, the surface roughness range of the base film is 50-70 mu m.
In S2, after the zinc-aluminum metal is melted into the molten liquid by thermal spraying, the molten liquid is sprayed onto the surface of the substrate film to attach, the surface of the molten liquid is scraped to be flat, a deposited metal conductive layer with a flat surface is formed by cooling, and then an insulating coating is smeared on the surface of the deposited metal conductive layer to form the composite capacitor film.
As a further improvement of the technical scheme, in the S2, the thickness range of the conductive layer is 5.60-6.20 mu m.
As a further improvement of the technical scheme, in the step S3, a grid-shaped zinc-aluminum metal conductive structure is printed on the surface of the composite capacitor film layer through a pattern transfer roller, the zinc-aluminum metal conductive structure passes through insulating paint and contacts with the conductive layer, the zinc-aluminum metal conductive structure comprises a plurality of series groups, each series group comprises two main pulses and a plurality of branches arranged between the two main pulses in parallel, two ends of each branch are connected with the main pulse, wherein the included angle range of the main pulse and each branch is 80-89 degrees, the interval range of adjacent branches is 8.0-15.0 mm, the interval range of the two main pulses in the series groups is 25.0-35.0 mm, and the interval range of the main pulse and the main pulse of the adjacent series groups is 1.0-3.0 mm.
As a further improvement of the technical scheme, the included angles of the main pulse and the branch pulse are 80 degrees, 83 degrees, 85 degrees and 88 degrees, and the distance ranges of the adjacent branch pulse are 8.5mm, 10.5mm, 12.1mm and 13.5mm.
As a further improvement of the technical scheme, the distance between two main veins in the series connection group is 25.0mm, 29.9mm, 32.3mm and 35.0mm, and the distance between the main veins and the main veins of the adjacent series connection group is 1.0mm, 1.8mm and 3.0mm.
As a further improvement of the technical scheme, the pattern transfer roller circulates the refrigerating oil inside during printing by the pattern transfer roller, so that the surface temperature is controlled at room temperature.
As a further improvement of the technical scheme, in S4, the silicone oil is condensed on the surface of the capacitor diaphragm in an evaporation and condensation mode to form a protective oil film wrapping the capacitor diaphragm, wherein the temperature range is 110-130 ℃ during evaporation and condensation.
Compared with the prior art, the invention has the beneficial effects that:
1. In the preparation method of the internal series connection reticular explosion-proof zinc aluminum film for the extra-high voltage capacitor, the capacitor is divided into a plurality of small units of insulating isolation strips and miniature fuses connected with the small capacitor units through the grid-shaped arrangement, when overvoltage breakdown occurs, the miniature fuses around the small units at the breakdown position are only fused, the breakdown point is isolated, the matrix capacitor keeps working normally, and when the protection action is performed, the miniature fuses limit the magnitude of breakdown current, the high temperature which can influence the operation of adjacent films is not generated, namely, under strong destructive voltage, all the small capacitor units are disconnected, the capacity of the capacitor is only approximate to zero, no power short circuit is generated, and the shell does not generate high temperature burst, so that the influence of overvoltage breakdown and high temperature on the capacitor film during breakdown is reduced.
2. In the preparation method of the internal tandem connection net-shaped explosion-proof zinc-aluminum film for the extra-high voltage capacitor, when the pattern transfer roller is used for printing, CM2 refrigerating oil is circulated in the pattern transfer roller, so that the surface temperature is controlled at 24 ℃ at room temperature, the damage of high temperature to the pattern roller and the film is reduced, the phenomenon of high Wen Shuaiyou is avoided, and the printing quality of an electrode is ensured. In the invention, the technical schemes can be mutually combined to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, like reference numerals being used to refer to like parts throughout the several views.
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic view of a portion of a grid-shaped metal conductive structure according to the present invention;
FIG. 3 is a graph showing peel strength according to the present invention;
FIG. 4 is a graph showing the heat shrinkage ratio of the present invention;
FIG. 5 is a second thermal shrinkage chart of the present invention;
FIG. 6 is a third thermal shrinkage schematic of the present invention;
FIG. 7 is a graph showing the heat shrinkage factor according to the present invention.
The meaning of each reference sign in the figure is: 1. A main pulse; 2. pulse branching.
Detailed Description
The following detailed description of preferred embodiments of the invention is made in connection with the accompanying drawings, which form a part hereof, and together with the description of the embodiments of the invention, are used to explain the principles of the invention and are not intended to limit the scope of the invention.
In describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the term "coupled" should be interpreted broadly, for example, as being fixedly coupled, as being detachably coupled, as being integrally coupled, as being mechanically coupled, as being electrically coupled, as being directly coupled, as being indirectly coupled via an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The terms "top," "bottom," "above … …," "below," and "on … …" are used throughout to describe relative positions with respect to components of the device, such as the relative positions of the top and bottom substrates inside the device. It will be appreciated that the devices are versatile, irrespective of their orientation in space.
The working surface of the invention can be a plane or a curved surface, and can be inclined or horizontal. For convenience of explanation, the embodiments of the present invention are placed on a horizontal plane and used on the horizontal plane, and thus "up and down" and "up and down" are defined.
Example 1
The existing safety mode of the capacitor is mechanical protection in the capacitor, when the capacitor breaks down and fails, high temperature and gasified substances are generated by large short-circuit current, overpressure is formed in the shell to deform the shell wall to be outwards bulging, the internal protection mechanism is driven to act, and the power supply is disconnected, so that other parts of the capacitor cannot be broken down, but the shell wall of the capacitor is deformed to be unusable.
Therefore, referring to fig. 1-2, an objective of the present embodiment is to provide a method for preparing an internal tandem connection net-shaped explosion-proof zinc-aluminum film for an extra-high voltage capacitor, which includes the following steps:
S1, casting a polypropylene raw material into a film through melt extrusion, and carrying out rough treatment on the film surface to generate a substrate film, wherein the rough treatment is to introduce an oxidant such as ozone, hydrogen peroxide, ferric chloride and the like on the film surface, and the oxidant is used for initiating oxidation reaction of the film surface to corrode the film surface, so that a surface structure with roughness is formed, the roughness of the film surface is improved, the roughness range of the substrate film surface is 30-80 mu m, and the improvement of the surface capability of the film is favorable for adhesion of a subsequent conductive layer;
S2, after zinc-aluminum metal is melted into molten liquid through thermal spraying, spraying the molten liquid onto the surface of a substrate film for adhesion, scraping the surface of the molten liquid, cooling to form a deposited metal conductive layer with a flat surface, and then coating insulating paint on the surface of the deposited metal conductive layer to form a composite capacitor film layer, wherein the thickness range of the conductive layer is 5.60-6.20 mu m;
S3, performing pattern printing on the surface of the composite capacitor film layer to generate an internal serial connection type capacitor film with a grid-shaped metal conductive structure, wherein the grid-shaped zinc-aluminum metal conductive structure is printed on the surface of the composite capacitor film layer through a pattern transfer roller, the zinc-aluminum metal conductive structure passes through an insulating coating and contacts with a conductive layer, the zinc-aluminum metal conductive structure comprises a plurality of serial connection groups, each serial connection group comprises two main pulses 1 and a plurality of branch pulses 2 which are arranged between the two main pulses 1 in parallel, two ends of each branch pulse 2 are connected with the main pulse 1, wherein the included angle alpha between the main pulse 1 and each branch pulse 2 is 80-89 degrees, the distance beta between the adjacent branch pulses 2 is 8.0-15.0 mm, the distance gamma between the two main pulses 1 in each serial connection group is 25.0-35.0 mm, and the distance L between the main pulse 1 and the main pulse 1 in each adjacent serial connection group is 1.0-3.0 mm;
S4, condensing the silicone oil on the surface of the capacitor membrane in an evaporation and condensation mode, forming a protective oil film wrapping the capacitor membrane, and then thickening and cutting the reserved side waves to generate a capacitor explosion-proof film matched with the capacitor in shape.
According to the invention, an insulating coating is arranged on a conductive layer, a grid-shaped zinc-aluminum metal conductive structure which is in contact with the conductive layer is arranged on the insulating coating, a capacitor is divided into a plurality of small-unit insulating isolation strips and small-capacity unit micro fuses which are connected with each other through the grid-shaped arrangement of the conductive structure, when overvoltage breakdown occurs, the capacitor only fuses around the small units at the breakdown position (the connection position of a main pulse 1 and a branch pulse 2) to isolate the breakdown point, the parent capacitor keeps normal operation, and when the protection action is performed, the micro fuses limit the magnitude of breakdown current, so that the high temperature which can influence the operation of adjacent films cannot be generated, namely, under strong destructive voltage, all the small-capacity units are disconnected, only the capacity of the capacitor is close to zero, no power short circuit is generated, and the shell does not generate high temperature burst, thereby reducing the influence of overvoltage breakdown and high temperature on the capacitor film.
Example 2
Because the conductive layer is a deposited metal conductive layer formed by cooling after zinc-aluminum metal is melted and covered on the surface layer of the substrate film in a thermal spraying mode, when the capacitor is used, the temperature rise phenomenon caused by the conversion of electric energy into heat energy exists, and the capacitor expands due to heating along with the rise of temperature;
as is known, the roughness of the surface of a substrate can cause the phenomenon of mutual engagement when a paint film is attached to the substrate, the larger the roughness is, the stronger the engagement force is, the larger the adhesion force is, but the excessive surface roughness can cause the coating to not completely fill a surface gap, so that tiny gaps are formed, and the adhesion force is reduced;
Therefore, the roughness of the bonding surface of the substrate film and the deposited metal conductive layer can influence the peeling strength of the substrate film and the deposited metal conductive layer, in order to ensure the performance of the capacitor, the roughness value which enables the deposited metal conductive layer and the substrate film to have higher peeling strength in the invention is determined, and in the embodiment, under the condition that other parameters are unchanged, the deposited metal conductive layer with the same thickness is formed by thermal spraying and cooling on the substrate films with different roughness, and the peeling strength of the deposited metal conductive layer and the substrate film is detected;
As shown in FIG. 3, when the roughness of the bonding surface of the base film is 50-70 μm, the peel strength between the deposited metal conductive layer and the base film is high.
Example 3
The prepared capacitor explosion-proof membrane can be stably supported by the inner series connection reticular structure formed by the main pulse 1 and the branch pulse 2, and excessive deformation of the capacitor explosion-proof membrane can be prevented when the capacitor explosion-proof membrane expands with heat and contracts with cold, so that the performance of the capacitor explosion-proof membrane, namely the structural support performance of the inner series connection reticular structure, can be ensured, and the performance of the capacitor explosion-proof membrane for resisting the expansion with heat and the contraction with cold can be influenced;
In order to determine the influence of the included angle alpha between the main pulse 1 and the branch pulse 2 and the distance beta between the adjacent branch pulses 2 on the performance of the capacitor explosion-proof film against expansion caused by heat and contraction caused by cold, under the condition that other parameters are unchanged, the prepared internal serial capacitor films with different included angles and different distances are selected respectively, the heat shrinkage rate of the capacitor films is detected according to the polyethylene heat shrinkage film for packaging GB/T13519-2016, the included angle alpha between the main pulse 1 and the branch pulse 2 is shown in a table 1, the distance beta between the adjacent branch pulses 2 is shown in a table 2, and the heat shrinkage rate of the capacitor films is shown in fig. 4 and 5.
TABLE 1 thermal shrinkage of capacitive diaphragms at different angles
TABLE 2 thermal shrinkage of capacitive membranes at different spacings of adjacent branches 2
According to the graph, when the included angle α between the main pulse 1 and the branch pulse 2 is 83 °, the thermal shrinkage rate of the capacitor film is low, and when the distance β between the adjacent branch pulses 2 is 12.1mm, the thermal shrinkage rate of the capacitor film is low;
In addition, the interval γ between two main pulses 1 in the series connection group and the interval L between the main pulse 1 and the main pulse 1 in the adjacent series connection group also affect the performance of the capacitor explosion-proof film against thermal expansion and contraction, and in order to determine the preferred interval γ and interval L, in this embodiment, under the condition that other parameters are unchanged, the heat shrinkage rate of the capacitor film is detected by changing the interval γ and by changing the interval L, and the heat shrinkage rate of the capacitor film is shown in fig. 6 and 7 according to the polyethylene heat shrinkage film for GB/T13519-2016 package, where the interval γ between two main pulses 1 in the series connection group is shown in table 3, and the interval L between the main pulse 1 and the main pulse 1 in the adjacent series connection group is shown in table 4.
TABLE 3 thermal shrinkage of capacitive membranes at different pitches of two main pulses 1 in series group
TABLE 4 thermal shrinkage of capacitive membranes at different spacings of the main pulse 1 and the main pulse 1 of adjacent series groups
According to the graph, when the distance gamma between two main pulses 1 in the series group is 29.9mm, the thermal shrinkage rate of the capacitor film is lower, and when the distance L between the main pulse 1 and the main pulse 1 in the adjacent series group is 1.8mm, the thermal shrinkage rate of the capacitor film is lower;
Example 4
The preparation of the internal series connection net-shaped explosion-proof zinc-aluminum film for the extra-high voltage capacitor is carried out according to the method provided by the embodiment and the determined preferred preparation parameters, and the method passes through the part 2 of the film for electric insulation of GB/T13542.2-2021: the test method is used for measuring the prepared capacitor explosion-proof film, the thickness of the capacitor explosion-proof film is 5.8 ㎛, the durability test (50 Hz capacitance loss after 70+/-2 ℃/24 h) is 1.39%, and the visual measurement shows that more than 70% of printing ink on the film is perfect, the adhesive force of the printing ink is better, and under the working condition of the embodiment, the metal layer of the capacitor explosion-proof film is firmly attached, the film surface is compact and uniform, no metal residue exists, and the requirements are met.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. The preparation method of the internal tandem connection net-shaped explosion-proof zinc-aluminum film for the extra-high voltage capacitor is characterized by comprising the following steps of:
s1, casting a polypropylene raw material into a film through melt extrusion, and roughening the surface of the film to generate a substrate film;
s2, after a conductive layer is attached to the surface of the substrate film, coating an insulating paint on the surface of the conductive layer to form a composite capacitor film layer;
S3, performing pattern printing on the surface of the composite capacitor film layer to generate an internal serial capacitor film with a grid-shaped metal conductive structure;
S4, after silicone oil is coated on the surface of the capacitor diaphragm to form a protective oil film, cutting is carried out to generate the capacitor explosion-proof film with the specified shape.
2. The method for preparing the internal tandem connection reticular explosion-proof zinc-aluminum film for the extra-high voltage capacitor according to claim 1, wherein in the step S1, the roughening treatment is to introduce an oxidant into the surface of the film, the oxidation reaction of the surface of the film is initiated by the oxidant, the roughness of the surface of the film is improved, and the surface roughness range of the substrate film is 30-80 mu m.
3. The method for preparing the internal tandem connection net-shaped explosion-proof zinc-aluminum film for the extra-high voltage capacitor according to claim 2, wherein the surface roughness of the base film is 50-70 μm.
4. The method for preparing the internal tandem connection net type explosion-proof zinc-aluminum film for the extra-high voltage capacitor according to claim 1, wherein in the step S2, after zinc-aluminum metal is melted into molten liquid through thermal spraying, the molten liquid of zinc-aluminum is sprayed onto the surface of a substrate film for adhesion, the surface of the molten liquid of zinc-aluminum is scraped to be flat, a deposited metal conducting layer with a flat surface is formed through cooling, and then an insulating coating is smeared on the surface of the deposited metal conducting layer to form a composite capacitor film layer.
5. The method for preparing an internal tandem connection net type explosion-proof zinc-aluminum film for extra-high voltage capacitors according to claim 4, wherein in the step S2, the thickness of the conductive layer is 5.60-6.20 μm.
6. The method for preparing the internal series connection reticular explosion-proof zinc-aluminum film for the extra-high voltage capacitor according to claim 1, wherein in the step S3, a grid-shaped zinc-aluminum metal conductive structure is printed on the surface of a composite capacitor film layer through a pattern transfer roller, the zinc-aluminum metal conductive structure passes through an insulating paint and is in contact with a conductive layer, the zinc-aluminum metal conductive structure comprises a plurality of series connection groups, each series connection group comprises two main pulses (1) and a plurality of branch pulses (2) which are arranged between the two main pulses (1) in parallel, two ends of each branch pulse (2) are connected with the main pulse (1), wherein an included angle between the main pulse (1) and each branch pulse (2) ranges from 80 degrees to 89 degrees, a distance between the adjacent branch pulses (2) ranges from 8.0 m to 15.0mm, a distance between the main pulse (1) and the main pulse (1) in the adjacent series connection group ranges from 1.0 m to 3.0mm.
7. The method for preparing the inner series connection net-shaped explosion-proof zinc-aluminum film for the extra-high voltage capacitor according to claim 6, wherein the included angles between the main pulse (1) and the branch pulse (2) are 80 degrees, 83 degrees, 85 degrees and 88 degrees, and the distance between the adjacent branch pulses (2) is 8.5mm, 10.5mm, 12.1mm and 13.5mm.
8. The method for preparing the internal series connection reticular explosion-proof zinc-aluminum film for the extra-high voltage capacitor according to claim 6, wherein the distance between two main veins (1) in the series connection group is 25.0mm, 29.9mm, 32.3mm and 35.0mm, and the distance between the main veins (1) and the main veins (1) in the adjacent series connection group is 1.0mm, 1.8mm and 3.0mm.
9. The method for producing an explosion-proof zinc-aluminum film of an internal tandem connection net for an extra-high voltage capacitor according to claim 6, wherein the surface temperature is controlled at room temperature by circulating a refrigerant oil inside the pattern transfer roller when printing is performed by the pattern transfer roller.
10. The method for preparing the internal tandem connection reticular explosion-proof zinc-aluminum film for the extra-high voltage capacitor according to claim 1, wherein in the step S4, silicone oil is condensed on the surface of the capacitor diaphragm in an evaporation condensation mode to form a protective oil film wrapping the capacitor diaphragm, and the temperature range during evaporation condensation is 110-130 ℃.
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