CN116638742A - Preparation method of polypropylene film, metallized polypropylene film and capacitor - Google Patents
Preparation method of polypropylene film, metallized polypropylene film and capacitor Download PDFInfo
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- CN116638742A CN116638742A CN202310481971.1A CN202310481971A CN116638742A CN 116638742 A CN116638742 A CN 116638742A CN 202310481971 A CN202310481971 A CN 202310481971A CN 116638742 A CN116638742 A CN 116638742A
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- stretching
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- polypropylene
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- chill roll
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 61
- -1 polypropylene Polymers 0.000 title claims abstract description 61
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 61
- 239000003990 capacitor Substances 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 238000005266 casting Methods 0.000 claims abstract description 19
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 230000001360 synchronised effect Effects 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 239000000155 melt Substances 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 16
- 238000001125 extrusion Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 8
- 238000009998 heat setting Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000000048 melt cooling Methods 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 3
- 230000002457 bidirectional effect Effects 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 239000010408 film Substances 0.000 description 45
- 229920006378 biaxially oriented polypropylene Polymers 0.000 description 15
- 239000011127 biaxially oriented polypropylene Substances 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 5
- 238000003851 corona treatment Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000032683 aging Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 239000011104 metalized film Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000009966 trimming 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
- 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
- B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
- B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
-
- 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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/24—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length
- B29C41/26—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length by depositing flowable material on a rotating drum
-
- 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
- B29C55/16—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial simultaneously
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C2035/0283—Thermal pretreatment of the plastics material
-
- 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
- B29L2009/00—Layered products
- B29L2009/005—Layered products coated
- B29L2009/008—Layered products coated metalized, galvanized
-
- 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
- B29L2031/00—Other particular articles
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
- B29L2031/3406—Components, e.g. resistors
-
- 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
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a preparation method of a polypropylene film, which comprises the following steps: (1) Stretching the polypropylene casting sheet to 4-6 times in the longitudinal direction, and cooling to room temperature to obtain a preliminary stretched polypropylene film; (2) The preliminary stretching polypropylene film is guided to a synchronous tenter for stretching, the stretching temperature is 158-162 ℃, the stretching amplitude is 5-11 times of the stretching amplitude in the transverse direction, and the stretching amplitude is 1.8-2.2 times of the stretching amplitude in the longitudinal direction. According to the preparation method, on the premise of not changing the existing production process conditions (raw materials, stretching temperature, multiplying power and the like), the original polypropylene casting sheet is firstly longitudinally stretched once and synchronously biaxially stretched again, and the stretching ratios in the two directions are different, so that the biaxially stretched polypropylene film for the capacitor, which is extremely thin and simultaneously keeps excellent in electrical performance, is obtained.
Description
Technical Field
The invention relates to a preparation method of a polypropylene film for a capacitor, the polypropylene film prepared by the preparation method and application of the polypropylene film in the capacitor. The polypropylene film prepared by the preparation method has the characteristics of extremely thin film and excellent electric performance.
Background
Polypropylene films for capacitors are often used in capacitors, such as high-voltage capacitors, for use as filters or smoothing applications for various switching power supplies, converters, inverters, and the like. In recent years, there has been a strong demand in the market for miniaturization and higher capacity of capacitors, and in order to further increase the capacity of capacitors, it has been demanded to expand the area of a dielectric in a limited volume space, thereby making a thin film thinner than conventional ones and having higher voltage field strength.
Biaxially oriented polypropylene films (Biaxially Oriented Polypropylene, BOPP for short) are widely used as dielectric films for capacitors because of their excellent electrical characteristics such as good withstand voltage characteristics and low dielectric loss, and high moisture resistance.
BOPP for capacitors currently commercialized is mostly stretched in a sequential stretching process: MD (machine direction, i.e., machine direction) longitudinal draw, about 4-6 fold stretch ratio; and TD (transverse direction, i.e., transverse direction) stretching to a stretch ratio of about 6 to 12 times, the resulting BOPP film stretch ratio product (md×td) is about 50 to 60 times. The BOPP film has excellent electrical performance, but is affected by adverse factors such as thickness limitation of a casting sheet, film breakage under the maximum stretching ratio (factors such as high isotacticity and high crystallization of resin) and the like, and the film yield is low when the film is a film with the thickness of 3 mu m or less.
The existing commercial synchronous stretching process can maximally realize the stretching multiplying power of MD multiplied by TD which is close to 10 multiplied by 10, and the existing BOPP synchronous stretching process film sample with the thickness of 2.0 mu m is on the market, but the electrical property is poor due to the influence of factors such as insufficient shaping in the MD direction.
Disclosure of Invention
One of the objects of the present invention is to provide a method for producing a biaxially stretched polypropylene film for a capacitor, which comprises subjecting an original polypropylene casting sheet to primary longitudinal stretching and secondary simultaneous biaxial stretching (stretching ratio in two directions is different) without changing the existing production process conditions (raw material, stretching temperature, magnification, etc.), thereby obtaining an extremely thin biaxially stretched polypropylene film for a capacitor, which has excellent electrical properties.
The invention solves the technical problems by the following technical proposal:
a method of preparing a polypropylene film comprising the steps of:
(1) Stretching the polypropylene casting sheet to 4-6 times in the longitudinal direction, and cooling to room temperature to obtain a preliminary stretched polypropylene film;
(2) The preliminary stretching polypropylene film is guided to a synchronous tenter for stretching, the stretching amplitude is 5-11 times of the stretching amplitude in the transverse direction, and the stretching amplitude is 1.8-2.2 times of the stretching amplitude in the longitudinal direction.
Preferably, the preparation method comprises the following steps:
(1) Stretching the polypropylene casting sheet to 4.8 times in the longitudinal direction, and cooling to room temperature to obtain a preliminary stretched polypropylene film;
(2) The preliminarily stretched polypropylene film was stretched by being guided to a synchronous tenter to a stretching width of 9.6 times in the transverse direction and 2 times in the longitudinal direction.
Further, in the above-mentioned production method, the polypropylene casting sheet is produced from a polypropylene raw material having the following properties: the isotacticity is over 99 percent, the ash content is less than 15ppm, the melt index is 3.2-3.7 g/10min, and the molecular weight distribution coefficient is 4.5-5.5.
Further, in the above-mentioned production method, the polypropylene cast sheet is produced by:
(3.1) feeding the polypropylene raw material into an extruder, filtering by a two-stage filter, and extruding a melt: melting and plasticizing through a feeding section with the temperature of 210-230 ℃, a melting section with the temperature of 240-260 ℃ and a homogenizing section with the temperature of 250-260 ℃, metering by a metering pump, filtering by a fine filter, and extruding by an extruder die head to obtain a melt; wherein the P2 pressure of the extrusion system is controlled to be 50-60 bar, and the material extrusion amount of the extruder is 220kg/h;
(3.2) casting the extruded melt: and (3) introducing the extruded melt to a chill roll at 75-95 ℃ for cooling and forming, wherein the diameter of the chill roll is 4.0 m, the rotating speed of the chill roll is 35-42 m/min, an air knife heating device attached to the chill roll aims at the chill roll to blow air to adhere the melt to the chill roll to realize melt cooling, the heating temperature of the air knife is 70-85 ℃, and the melt is cooled on the chill roll to obtain the polypropylene casting sheet.
Preferably, in the above preparation method, the polypropylene cast sheet is prepared by:
(3.1) feeding the polypropylene raw material into an extruder, filtering by a two-stage filter, and extruding a melt: melting and plasticizing through a feeding section with the temperature of 220, a melting section with the temperature of 250 ℃ and a homogenizing section with the temperature of 255 ℃, metering by a metering pump, filtering by a fine filter, and extruding by an extruder die head to obtain a melt; wherein the P2 pressure of the extrusion system is controlled to be 50-60 bar, and the material extrusion amount of the extruder is 220kg/h;
(3.2) casting the extruded melt: and (3) introducing the extruded melt to a chill roll at 90 ℃ for cooling and forming, wherein the diameter of the chill roll is 4.0 m, the rotating speed of the chill roll is 38m/min, an air knife heating device attached to the chill roll aims at the chill roll to blow air to adhere and attach the melt to the chill roll to realize melt cooling, the heating temperature of the air knife is 83 ℃, and the melt is cooled on the chill roll to obtain the polypropylene casting sheet.
Further, in the above preparation method, in the step (1), the preheating treatment is performed before the stretching, and the preheating temperature is 135 to 155 ℃.
Preferably, in the above preparation method, in the step (1), the preheating treatment is performed before the stretching, and the preheating temperature is 150 ℃.
Further, in the preparation method, in the step (2), preheating treatment is carried out before stretching, and the preheating temperature is 145-160 ℃; stretching temperature is 158-162 ℃, heat setting temperature after stretching is 165-170 ℃, a thick sheet is transversely guided and stretched through a mechanical rail to form a film during stretching, a magnetic clip is longitudinally driven through a linear motor, and speed difference between the clips is formed by changing speeds of different clips, so that simultaneous bidirectional stretching is realized.
Preferably, in the above preparation method, in the step (2), the preheating treatment is performed before the stretching, the preheating temperature is 156 ℃, the stretching temperature is 160 ℃, and the heat setting temperature after the stretching is 166 ℃.
The thickness of the polypropylene film prepared by the preparation method is 1-3 mu m.
The use of the polypropylene film described above in a capacitor.
A metallized polypropylene film for a capacitor, wherein a metal is vapor deposited on one or both surfaces of the polypropylene film.
A capacitor is formed by the metallized polypropylene film for the capacitor.
Detailed Description
Example 1:
a method for preparing a polypropylene film for a capacitor, the method comprising the steps of:
1. selecting raw materials: the isotacticity of the polypropylene raw material is required to be more than 99%, the ash content is less than 15ppm, the melt index is 3.2-3.7 g/10min, and the molecular weight distribution coefficient is 4.5-5.5;
2. the raw materials are put into an extruder, and melt is extruded after being filtered by a two-stage filter: the raw materials are melted and plasticized through a feeding section with the temperature of 220, a melting section with the temperature of 250 ℃ and a homogenization section with the temperature of 255 ℃, then are metered by a metering pump, filtered by a fine filter and extruded by an extruder die head to obtain a melt; wherein the P2 pressure of the extrusion system is controlled to be 50-60 bar, and the material extrusion amount of the extruder is 220kg/h;
3. casting the extruded melt: introducing the extruded melt to a chill roll at 90 ℃ for cooling and forming, wherein the diameter of the chill roll is 4.0 m, the rotating speed of the chill roll is 38m/min, an air knife heating device on the chill roll is aligned to the chill roll for blowing to enable the melt to adhere and attach to the chill roll for cooling the melt, the heating temperature of the air knife is 83 ℃, and the melt is cooled on the chill roll to obtain a casting sheet;
4. the cast sheet was kept at 150 ℃ for preheating, passed between rolls provided with a speed difference, stretched 4.8 times in the longitudinal direction, and immediately cooled to room temperature. Then, the preliminary stretch sheet is directed to a synchronous tenter;
5. preheating, biaxially oriented synchronous stretching and heat setting are carried out on the preliminary stretching sheet to form a film: the preheating temperature is 156 ℃; stretching temperature is 160 ℃, and heat setting temperature is 166 ℃; transversely stretching the thick sheet through mechanical track guidance to form a film, longitudinally driving the magnetic clips through a linear motor, and forming the speed difference between the clips by changing the speeds of different clips, so that simultaneous biaxial stretching is realized, and a film with a transverse stretching multiplying power of 9.6 and a longitudinal stretching multiplying power of 2 is formed;
6. cooling, thickness measurement, trimming and corona treatment are carried out on the film after synchronous stretching: the cooling temperature is 25-30 ℃, the edge cutting and thickness measurement are carried out, the thickness measurement is that the film after synchronous stretching is subjected to edge cutting measurement, the thickness of the film is 2.0 mu m, then the corona treatment is carried out on the surface of the film, and the strength of the corona treatment is 14 W.min/m < 2 >;
7. rolling the film after corona treatment: the winding tension is 20N/m, and the winding pressure is 150N/m;
8. aging treatment is carried out on the film after rolling: ageing the rolled film in an environment with the temperature of 26-30 ℃ and the humidity of less than 60% and the purification grade of 1 ten thousand grades for 72 hours;
comparative example 1:
a sample of BOPP of 2.4 μm manufactured by a successive stretching (about 4.8 times MD and about 9.8 times TD) process is used on the market.
Comparative example 2:
a2.0 μm BOPP sample from a synchronous stretching (MD X TD. About.5.8X19.2 times) process is used on the market.
Example 3:
three groups of BOPP films from example 1, comparative example 1 and comparative example 2 were evaporated to a metallized film with a sheet resistance of 10 ohms, a capacitor core with a capacitance of 10 μf was wound by the same process, and 500/450vdc,2000h was applied at 105 ℃ to observe the properties of the BOPP films, giving the following performance parameter comparison table:
。
as is apparent from the performance parameter comparison table, example 1 of the present invention has the following inventive effects compared to comparative examples 1 and 2:
the embodiment 1 of the invention provides a production process of ultrathin BOPP, and the BOPP film for the capacitor with ultrathin thickness less than or equal to 2 μm and uniform film thickness can be easily obtained by adopting the process.
The preparation method provided by the embodiment 1 of the invention is characterized in that the longitudinal preliminary stretching is performed first, and then the longitudinal and transverse synchronous stretching is performed, so that the BOPP which is thinner than the BOPP obtained by the successive stretching process and has the same excellent electrical property can be obtained, and the preparation method is extremely suitable for film capacitors, especially suitable for occasions requiring high capacitance density and high field intensity, such as new energy automobiles.
Claims (13)
1. A method of preparing a polypropylene film comprising the steps of:
(1) Stretching the polypropylene casting sheet to 4-6 times in the longitudinal direction, and cooling to room temperature to obtain a preliminary stretched polypropylene film;
(2) The preliminary stretching polypropylene film is guided to a synchronous tenter for stretching, the stretching amplitude is 5-11 times of the stretching amplitude in the transverse direction, and the stretching amplitude is 1.8-2.2 times of the stretching amplitude in the longitudinal direction.
2. The preparation method according to claim 1, characterized in that it comprises the following steps:
(1) Stretching the polypropylene casting sheet to 4.8 times in the longitudinal direction, and cooling to room temperature to obtain a preliminary stretched polypropylene film;
(2) The preliminarily stretched polypropylene film was stretched by being guided to a synchronous tenter to a stretching width of 9.6 times in the transverse direction and 2 times in the longitudinal direction.
3. The method of producing according to claim 1 or 2, wherein the polypropylene cast sheet is produced from a polypropylene raw material having the following properties: the isotacticity is more than 99%, the ash content is less than 15ppm, and the melt index is 3.2 to the extent
3.7g/10min, and the molecular weight distribution coefficient is 4.5-5.5.
4. A production method according to any one of claims 1 to 3, wherein the polypropylene cast sheet is produced by:
(3.1) feeding the polypropylene raw material into an extruder, filtering by a two-stage filter, and extruding a melt: melting and plasticizing through a feeding section with the temperature of 210-230 ℃, a melting section with the temperature of 240-260 ℃ and a homogenizing section with the temperature of 250-260 ℃, metering by a metering pump, filtering by a fine filter, and extruding by an extruder die head to obtain a melt; wherein the P2 pressure of the extrusion system is controlled to be 50-60 bar, and the material extrusion amount of the extruder is 220kg/h;
(3.2) casting the extruded melt: and (3) introducing the extruded melt to a chill roll at 75-95 ℃ for cooling and forming, wherein the diameter of the chill roll is 4.0 m, the rotating speed of the chill roll is 35-42 m/min, an air knife heating device attached to the chill roll aims at the chill roll to blow air to adhere the melt to the chill roll to realize melt cooling, the heating temperature of the air knife is 70-85 ℃, and the melt is cooled on the chill roll to obtain the polypropylene casting sheet.
5. The method of producing according to claim 4, wherein the polypropylene cast sheet is produced by:
(3.1) feeding the polypropylene raw material into an extruder, filtering by a two-stage filter, and extruding a melt: melting and plasticizing through a feeding section with the temperature of 220, a melting section with the temperature of 250 ℃ and a homogenizing section with the temperature of 255 ℃, metering by a metering pump, filtering by a fine filter, and extruding by an extruder die head to obtain a melt; wherein the P2 pressure of the extrusion system is controlled to be 50-60 bar, and the material extrusion amount of the extruder is 220kg/h;
(3.2) casting the extruded melt: and (3) introducing the extruded melt to a chill roll at 90 ℃ for cooling and forming, wherein the diameter of the chill roll is 4.0 m, the rotating speed of the chill roll is 38m/min, an air knife heating device attached to the chill roll aims at the chill roll to blow air to adhere and attach the melt to the chill roll to realize melt cooling, the heating temperature of the air knife is 83 ℃, and the melt is cooled on the chill roll to obtain the polypropylene casting sheet.
6. The production method according to claim 1 or 2, wherein in step (1), the preheating treatment is performed before the stretching, and the preheating temperature is 135 to 155 ℃.
7. The process according to claim 6, wherein in the step (1), the preheating treatment is performed before the stretching, and the preheating temperature is 150 ℃.
8. The production method according to claim 1 or 2, wherein in step (2), a preheating treatment is performed before stretching, the preheating temperature being 145 to 160 ℃; stretching temperature is 158-162 ℃, heat setting temperature after stretching is 165-170 ℃, a thick sheet is transversely guided and stretched through a mechanical rail to form a film during stretching, a magnetic clip is longitudinally driven through a linear motor, and speed difference between the clips is formed by changing speeds of different clips, so that simultaneous bidirectional stretching is realized.
9. The method according to claim 8, wherein in the step (2), the preheating treatment is performed before the stretching, the preheating temperature is 156 ℃, the stretching temperature is 160 ℃, and the heat setting temperature after the stretching is 166 ℃.
10. The polypropylene film produced by the production method according to claim 1 or 2, characterized in that: the thickness of the polypropylene film is 1-3 mu m.
11. Use of the polypropylene film according to claim 10 in a capacitor.
12. A metallized polypropylene film for capacitors, wherein one or both surfaces of the polypropylene film of claim 10 is vapor deposited with a metal.
13. A capacitor formed using the metallized polypropylene film for a capacitor according to claim 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310481971.1A CN116638742A (en) | 2023-04-28 | 2023-04-28 | Preparation method of polypropylene film, metallized polypropylene film and capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310481971.1A CN116638742A (en) | 2023-04-28 | 2023-04-28 | Preparation method of polypropylene film, metallized polypropylene film and capacitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116638742A true CN116638742A (en) | 2023-08-25 |
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ID=87638962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310481971.1A Pending CN116638742A (en) | 2023-04-28 | 2023-04-28 | Preparation method of polypropylene film, metallized polypropylene film and capacitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116638742A (en) |
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2023
- 2023-04-28 CN CN202310481971.1A patent/CN116638742A/en active Pending
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