CN116277827A - Polypropylene film, metallized film, capacitor, preparation method and application - Google Patents
Polypropylene film, metallized film, capacitor, preparation method and application Download PDFInfo
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- CN116277827A CN116277827A CN202310368550.8A CN202310368550A CN116277827A CN 116277827 A CN116277827 A CN 116277827A CN 202310368550 A CN202310368550 A CN 202310368550A CN 116277827 A CN116277827 A CN 116277827A
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- stretching
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- ratio
- sheet
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- 239000010408 film Substances 0.000 title claims abstract description 74
- -1 Polypropylene Polymers 0.000 title claims abstract description 51
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 51
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 51
- 239000003990 capacitor Substances 0.000 title claims abstract description 16
- 239000011104 metalized film Substances 0.000 title claims abstract description 14
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000005096 rolling process Methods 0.000 claims abstract description 11
- 239000011347 resin Substances 0.000 claims description 16
- 229920005989 resin Polymers 0.000 claims description 16
- 238000007493 shaping process Methods 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 8
- 238000003851 corona treatment Methods 0.000 claims description 4
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 6
- 238000004512 die casting Methods 0.000 abstract description 4
- 229920001410 Microfiber Polymers 0.000 abstract description 2
- 230000009471 action Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 239000003658 microfiber Substances 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 description 20
- 229920006378 biaxially oriented polypropylene Polymers 0.000 description 4
- 239000011127 biaxially oriented polypropylene Substances 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
- B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/0081—After-treatment of articles without altering their shape; Apparatus therefor using an electric field, e.g. for electrostatic charging
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
-
- 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
Abstract
The invention relates to the technical field of films, in particular to a polypropylene film, a metallized film, a capacitor, a preparation method and application, wherein the preparation method of the polypropylene film comprises the steps of sequentially carrying out die-casting stretching on a manufactured cast sheet, and rolling stretching to obtain the film, wherein the ratio of the cross section area of the sheet to the cross section area of an outlet of the die is 4-5, the stretching ratio of die-casting stretching is 6-8, and the stretching ratio of rolling stretching is 30-38. According to the technical scheme, before the rolling and stretching process, the die stretching is carried out, the material is forced to neck along with the die stretching, the internal molecular chains are oriented under the action of a stretching force field to form a microfiber structure along the stretching direction, the crystallinity is promoted to rise, and the longitudinal and transverse stretching performance of the polypropylene film prepared through the rolling and stretching is improved, so that the requirement of miniaturization of the capacitor is met.
Description
Technical Field
The invention relates to the technical field of films, in particular to a polypropylene film, a metallized film, a capacitor, a preparation method and application.
Background
The base film of the film capacitor takes polypropylene as a main raw material, and is made into a biaxially oriented polypropylene film (BOPP film) after a biaxial stretching process, wherein the BOPP film has the characteristics of high frequency, high voltage resistance and the like, and has become the mainstream of the film capacitor. In the future, new energy power supply modules develop towards size miniaturization and functional integration, and higher volume requirements are put forward for the film capacitors. The thinner the base film, the more pronounced its bulk advantage is under the same performance. However, biaxially stretched polypropylene films (about 4 μm) having a smaller thickness are more likely to be broken and stretched poorly due to stretching during production than polypropylene films having a usual thickness, and further improvement is required.
Disclosure of Invention
The present invention aims to solve the above technical problems.
The invention aims to provide a polypropylene film with high stretching performance, aiming at the poor stretching of a BOPP film with the thickness of about 4 mu m or even lower prepared by the prior biaxial stretching process.
The invention provides a preparation method of a polypropylene film, which comprises the steps of sequentially carrying out die-casting stretching and roll-pressing stretching on a manufactured cast sheet to obtain the film, wherein the ratio of the sectional area of a sheet to the sectional area of an outlet of the die is 4-5, the stretching ratio of die-casting stretching is 6-8, and the stretching ratio of roll-pressing stretching is 30-38.
According to the embodiment of the invention, the die stretching adopts two-stage stretching, wherein the ratio of the sectional area of the sheet after the first-stage stretching to the sectional area of the die outlet is 2-3; the ratio of the cross-sectional area of the sheet after the second-stage stretching to the cross-sectional area of the die outlet is 4-5.
According to the embodiment of the invention, the rolling stretching adopts gradual stretching or synchronous bidirectional stretching; wherein the stretching ratio of the longitudinal stretching is 3-4, and the stretching ratio of the transverse stretching is 9-10.
According to an embodiment of the present invention, the cast sheet is manufactured as follows: melting the polypropylene raw resin at 200-300 ℃, extruding from a die head, cooling at 95-105 ℃ and solidifying to obtain the cast sheet with the thickness of 0.5-1mm.
According to the embodiment of the invention, the rolling stretching is divided into a preheating section, a stretching section and a shaping section, wherein the temperature of the preset section is set to 120-150 ℃, the temperature of the stretching section is set to 150-160 ℃, and the temperature of the shaping section is set to 145-155 ℃.
According to an embodiment of the present invention, further comprising: and carrying out corona treatment on the stretched film to obtain a finished film.
The invention also provides a polypropylene film prepared by the preparation method of the polypropylene film.
The invention also provides a metallized film, which is provided with a metal film on one side or two sides of the polypropylene film.
The invention also provides a capacitor comprising a metallized film as described above.
The invention also provides the application of the metallized film in a film capacitor.
On the basis of conforming to the common knowledge in the field, the above preferred conditions can be arbitrarily combined to obtain the preferred examples of the invention.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects:
according to the preparation method of the polypropylene film, the prepared cast sheet is sequentially stretched by the die, and rolled and stretched to prepare the film, wherein the ratio of the sectional area of the sheet to the sectional area of an outlet of the die is 4-5, the stretching ratio of the die stretching is 6-8, and the stretching ratio of the rolled and stretched is 30-38. According to the technical scheme, before the rolling and stretching process, the die stretching is carried out, the material is forced to neck along with the die stretching, the internal molecular chains are oriented under the action of a stretching force field to form a microfiber structure along the stretching direction, the crystallinity is promoted to rise, and the longitudinal and transverse stretching performance of the polypropylene film prepared through the rolling and stretching is improved, so that the requirement of miniaturization of the capacitor is met.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Detailed Description
The invention is further illustrated by way of example below, but it will be understood that these specific examples will not limit the scope of the invention in any way. Unless otherwise noted, the raw materials used in the following examples are all commercial products, and the quality thereof meets the national standard.
The embodiment of the invention provides a preparation method of a polypropylene film, which comprises the following steps:
step S1: melt extrusion of polypropylene raw material resin;
step S2: cooling and solidifying the extruded resin to obtain a cast sheet;
step S3: stretching the prepared cast sheet to prepare a film;
step S4: and carrying out corona treatment on the stretched film to obtain a finished film.
According to the embodiment of the invention, the polypropylene raw material resin adopts a high-purity electrical grade polypropylene raw material, namely a raw material with isotacticity of more than 97 percent, ash content of less than 20ppm and melt index of 2.5-3.2.
According to an embodiment of the present invention, step S1 is specifically to supply a polypropylene raw material to an extruder, heat and melt the polypropylene raw material, and the heating temperature is preferably 200 ℃ to 300 ℃, more preferably 220 ℃ to 280 ℃, and after the melted raw material passes through a filter, melt extrusion is performed from a die.
According to the embodiment of the invention, the step S2 is to cool and solidify the extruded resin at 90-120 ℃, more preferably at 95-105 ℃ to obtain the cast sheet. The thickness of the cast sheet is not particularly limited as long as it is convenient to prepare a polypropylene film having a thickness of 4 μm or less, but is preferably 0.3mm to 1mm, more preferably 0.5 to 1mm.
According to the embodiment of the invention, the step S3 is specifically to stretch the manufactured cast sheet sequentially through a die, and roll-stretching to obtain the film, wherein the ratio of the sectional area of the sheet to the sectional area of the outlet of the die is 4-5, the stretch ratio of the die stretching is 6-8, and the stretch ratio of the roll-stretching is 30-38.
In the mode of the present invention, the stretch ratio of die stretching refers to the ratio of the initial sheet sectional area of the cast sheet to the stretched sheet sectional area, and is defined as the actual stretch ratio. The ratio of the cross-sectional area of the sheet to the cross-sectional area of the die exit is defined as the initial draw ratio, and the sheet tends to undergo free draw after passing through the exit, so the initial draw ratio is always less than the actual draw ratio. The cross-sectional area of the sheet after the actual draw ratio, that is, the cross-sectional area of the sheet before roll drawing.
In the mode of the invention, the die stretching can adopt two-stage stretching. In the second stretching, the ratio of the sectional area of the sheet after the first stretching to the sectional area of the outlet of the die is 2-3, and the ratio of the sectional area of the sheet after the second stretching to the sectional area of the outlet of the die is 4-5. Through testing, the crystallinity can be better controlled by adopting the secondary stretching mode, and the longitudinal stretching performance of the finished film is further improved.
In the mode of the invention, the rolling stretching adopts gradual stretching or synchronous bidirectional stretching; wherein the stretching ratio of the longitudinal stretching is 3-4, and the stretching ratio of the transverse stretching is 9-10.
In the mode of the invention, the biaxial stretching is divided into a preheating section, a stretching section and a shaping section, the temperature of the preset section is set to 120-150 ℃, the temperature of the stretching section is set to 150-160 ℃, and the temperature of the shaping section is set to 145-155 ℃. The preheating section can be further divided into three sections, the temperature gradually rises along the feeding direction, and the following preferable steps are: 120-130 ℃, 130-140 ℃, 140-150 ℃; the stretching section can be further divided into three sections, and the temperature is preferably 150-152 ℃, 150-156 ℃ and 156-160 ℃ in sequence; the shaping section can be further divided into three sections, and the temperature is preferably 152-155 ℃, 148-152 ℃, 145-150 ℃ in sequence.
The polypropylene film with the thickness of 4 mu m is prepared through the stretching process, the longitudinal stretching performance is more than 200Mpa, and the transverse stretching performance is more than 250 Mpa.
According to the embodiment of the invention, step S4 carries out corona treatment on the stretched film to obtain a finished film so as to improve the bonding characteristic in the processing procedure of the metallized film.
The invention also provides a polypropylene film prepared by the preparation method of the polypropylene film.
The invention also provides a metallized film, which is provided with a metal film on one side or two sides of the polypropylene film.
The invention also provides a capacitor comprising a metallized film as described above.
The invention also provides the application of the metallized film in a film capacitor.
Example 1
After the polypropylene raw material resin is melted at 250 ℃, the polypropylene raw material resin is processed by a filter and is extruded by a die head, and a 1mm cast sheet is obtained after cooling and solidifying at 95 ℃. And (3) stretching the cast sheet at 140 ℃ into a die, wherein the ratio of the sectional area of the sheet after the first-stage stretching to the sectional area of the die outlet is 2, the ratio of the sectional area of the sheet after the second-stage stretching to the sectional area of the die outlet is 4, the stretching ratio of the die stretching is controlled to be 6, and then the sheet is longitudinally stretched for 3 times through a roller with a speed difference, and immediately cooled to room temperature. Then, the obtained stretched film was introduced into a tenter, stretched 9 times in the transverse direction, and heat-set to obtain a final film having a thickness of 4. Mu.m. Wherein, the three temperatures of the preheating section are 120 ℃,135 ℃ and 145 ℃ in sequence, the three temperatures of the stretching section are 152 ℃,156 ℃ and 160 ℃ in sequence, and the three temperatures of the shaping section are 155 ℃,152 ℃ and 147 ℃ in sequence.
Example 2
After the polypropylene raw material resin is melted at 250 ℃, the polypropylene raw material resin is processed by a filter and is extruded by a die head, and a 1mm cast sheet is obtained after cooling and solidifying at 100 ℃. And (3) stretching the cast sheet at 140 ℃ into a die, wherein the ratio of the sectional area of the sheet after the first-stage stretching to the sectional area of the die outlet is 2, the ratio of the sectional area of the sheet after the second-stage stretching to the sectional area of the die outlet is 5, the stretching ratio of the die stretching is controlled to be 7, and then the sheet is longitudinally stretched for 3 times through a roller with a speed difference, and immediately cooled to room temperature. Then, the obtained stretched film was introduced into a tenter, stretched 10 times in the transverse direction, and heat-set to obtain a final film having a thickness of 4. Mu.m. Wherein, the three temperatures of the preheating section are 120 ℃,135 ℃ and 145 ℃ in sequence, the three temperatures of the stretching section are 152 ℃,156 ℃ and 160 ℃ in sequence, and the three temperatures of the shaping section are 155 ℃,152 ℃ and 147 ℃ in sequence.
Example 3
After the polypropylene raw material resin is melted at 250 ℃, the polypropylene raw material resin is processed by a filter and is extruded by a die head, and a cast sheet with the thickness of 0.5mm is obtained after cooling and solidifying at 105 ℃. And (3) stretching the cast sheet at 140 ℃ into an inlet die, wherein the ratio of the sectional area of the sheet after the first-stage stretching to the sectional area of the outlet die is 3, the ratio of the sectional area of the sheet after the second-stage stretching to the sectional area of the outlet die is 4, the stretching ratio of the outlet die stretching is controlled to be 7, and then the sheet is longitudinally stretched for 4 times by a roller with a speed difference and is immediately cooled to room temperature. Then, the obtained stretched film was introduced into a tenter, stretched 9 times in the transverse direction, and heat-set to obtain a final film having a thickness of 3.5. Mu.m. Wherein, the three temperatures of the preheating section are 120 ℃,135 ℃ and 145 ℃ in sequence, the three temperatures of the stretching section are 152 ℃,156 ℃ and 160 ℃ in sequence, and the three temperatures of the shaping section are 155 ℃,152 ℃ and 147 ℃ in sequence.
Example 4
After the polypropylene raw material resin is melted at 250 ℃, the polypropylene raw material resin is processed by a filter and is extruded by a die head, and a cast sheet with the thickness of 0.5mm is obtained after cooling and solidifying at 105 ℃. And (3) stretching the cast sheet at 140 ℃ into an inlet die, wherein the ratio of the sectional area of the sheet after the first-stage stretching to the sectional area of the outlet die is 3, the ratio of the sectional area of the sheet after the second-stage stretching to the sectional area of the outlet die is 5, the stretching ratio of the outlet die stretching is controlled to be 8, and then the sheet is longitudinally stretched for 4 times by a roller with a speed difference and immediately cooled to room temperature. Then, the obtained stretched film was introduced into a tenter, stretched 9 times in the transverse direction, and heat-set to obtain a final film having a thickness of 3.5. Mu.m. Wherein, the three temperatures of the preheating section are 120 ℃,135 ℃ and 145 ℃ in sequence, the three temperatures of the stretching section are 152 ℃,156 ℃ and 160 ℃ in sequence, and the three temperatures of the shaping section are 155 ℃,152 ℃ and 147 ℃ in sequence.
Example 5
After the polypropylene raw material resin is melted at 250 ℃, the polypropylene raw material resin is processed by a filter and is extruded by a die head, and a cast sheet with the thickness of 0.2mm is obtained after cooling and solidifying at 105 ℃. And (3) stretching the cast sheet at 140 ℃ into an inlet die, wherein the ratio of the sectional area of the sheet after the first-stage stretching to the sectional area of the outlet die is 3, the ratio of the sectional area of the sheet after the second-stage stretching to the sectional area of the outlet die is 5, the stretching ratio of the outlet die stretching is controlled to be 8, and then the sheet is longitudinally stretched for 4 times by a roller with a speed difference and immediately cooled to room temperature. Then, the obtained stretched film was introduced into a tenter, stretched 10 times in the transverse direction, and heat-set to obtain a final film having a thickness of 3.2. Mu.m. Wherein, the three temperatures of the preheating section are 120 ℃,135 ℃ and 145 ℃ in sequence, the three temperatures of the stretching section are 152 ℃,156 ℃ and 160 ℃ in sequence, and the three temperatures of the shaping section are 155 ℃,152 ℃ and 147 ℃ in sequence.
The polypropylene films prepared in examples 1 to 5 of the present invention were evaluated, and the main test method was GB/T12802, and the specific evaluation results are shown in the following table.
According to the embodiment and the test result, the 3.2-4 um polypropylene film prepared by adopting the die drawing and roll drawing processes through selecting the high-purity electrical grade polypropylene raw material, has the longitudinal drawing performance of more than 200Mpa and the transverse drawing performance of more than 250Mpa, has good heat resistance and dielectric strength, and can meet the requirement of miniaturization of the capacitor.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention in any way; any person skilled in the art can make many possible variations and modifications to the technical solution of the present invention or modifications to equivalent embodiments using the methods and technical contents disclosed above, without departing from the scope of the technical solution of the present invention. Therefore, any simple modification, equivalent substitution, equivalent variation and modification of the above embodiments according to the technical substance of the present invention, which do not depart from the technical solution of the present invention, still fall within the scope of the technical solution of the present invention.
Claims (9)
1. A preparation method of a polypropylene film with 3.2-4 um is characterized in that a prepared cast sheet is sequentially stretched by a die, rolled and stretched to prepare the film, wherein the ratio of the cross section area of the sheet to the cross section area of an outlet of the die is 4-5, the stretching ratio of the die stretching is 6-8, and the stretching ratio of the rolled and stretched is 30-38; the rolling stretching adopts gradual stretching or synchronous bidirectional stretching; wherein the stretching ratio of the longitudinal stretching is 3-4, and the stretching ratio of the transverse stretching is 9-10.
2. The method for preparing a polypropylene film with 3.2-4 um as claimed in claim 1, wherein the die stretching adopts two-stage stretching, wherein the ratio of the cross section area of the sheet after the first-stage stretching to the cross section area of the die outlet is 2-3; the ratio of the cross-sectional area of the sheet after the second-stage stretching to the cross-sectional area of the die outlet is 4-5.
3. The method for preparing a 3.2-4 um polypropylene film according to any one of claims 1-2, wherein the cast sheet is prepared by the steps of: melting the polypropylene raw resin at 200-300 ℃, extruding from a die head, cooling at 95-105 ℃ and solidifying to obtain the cast sheet with the thickness of 0.5-1mm.
4. The method for preparing a polypropylene film with 3.2-4 um according to claim 1, wherein the rolling stretching is divided into a preheating section, a stretching section and a shaping section, the temperature of the preset section is set to 120-150 ℃, the temperature of the stretching section is set to 150-160 ℃, and the temperature of the shaping section is set to 145-155 ℃.
5. The method for preparing a polypropylene film with 3.2-4 um according to claim 1, further comprising: and carrying out corona treatment on the stretched film to obtain a finished film.
6. The polypropylene film according to any one of claims 1 to 5, wherein the polypropylene film is produced by a method for producing a polypropylene film having 3.2 to 4 μm.
7. A metallized film comprising a metal film on one or both sides of the polypropylene film according to claim 6.
8. A capacitor comprising the metallized film of claim 7.
9. Use of the metallized film of claim 7 in a film capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310368550.8A CN116277827A (en) | 2023-04-10 | 2023-04-10 | Polypropylene film, metallized film, capacitor, preparation method and application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310368550.8A CN116277827A (en) | 2023-04-10 | 2023-04-10 | Polypropylene film, metallized film, capacitor, preparation method and application |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116277827A true CN116277827A (en) | 2023-06-23 |
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ID=86825808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310368550.8A Pending CN116277827A (en) | 2023-04-10 | 2023-04-10 | Polypropylene film, metallized film, capacitor, preparation method and application |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116277827A (en) |
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2023
- 2023-04-10 CN CN202310368550.8A patent/CN116277827A/en active Pending
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