CN109593271B - Method for improving breakdown field strength of polypropylene film based on benzil - Google Patents
Method for improving breakdown field strength of polypropylene film based on benzil Download PDFInfo
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- CN109593271B CN109593271B CN201811445278.4A CN201811445278A CN109593271B CN 109593271 B CN109593271 B CN 109593271B CN 201811445278 A CN201811445278 A CN 201811445278A CN 109593271 B CN109593271 B CN 109593271B
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- polypropylene
- benzil
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- field strength
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- 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
- H01G4/18—Organic dielectrics of synthetic material, e.g. derivatives of cellulose
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
Abstract
The invention discloses a method for improving breakdown field strength of a polypropylene film based on benzil, which comprises the following steps: (1) dry polypropylene granules were mixed with benzil according to a 99.5: fully mixing the components in a mass ratio of 0.5 in an internal mixer to obtain the polypropylene composite material; meanwhile, a control group, i.e., a polypropylene material to which no benzil was added, was set. (2) The polypropylene composite material was pressed into a sample having a side length of 90X 90mm and a thickness of 80 μm by a press vulcanizer. (3) The sample was vacuum dried for 24 hours to remove impurities from the sample sufficiently. (4) Performing a direct current breakdown test on the sample by using a ball plate electrode; (5) repeating steps (2) - (4) for a sample of the control polypropylene material. Experiments prove that the method can effectively improve the breakdown field strength of the polypropylene film.
Description
Technical Field
The invention relates to a method for improving the breakdown field strength of a capacitor dielectric olefin film, in particular to a method for improving the breakdown field strength of a polypropylene film based on benzil.
Background
The direct current capacitor plays an irreplaceable role in the current power system, and is developing towards light weight and miniaturization, and the development of the dielectric material is the key of the development. The solid dielectric material of the power capacitor is basically a polypropylene film, and the breakdown field strength of the polypropylene film is reduced due to the existence of 'electric weak points' such as impurities and the like introduced in the production process of the polypropylene film. Dielectric breakdown at dc voltages is an important factor causing dc capacitor failure. Therefore, the research on the method for reducing the influence of the electric weakness on the breakdown field strength of the polypropylene film has great significance on the service life of the power capacitor and the safe operation of a power system.
In recent decades, some researchers have conducted research to increase the breakdown field strength of polymers using nano-polymers. However, how to ensure uniform dispersion of nanoparticles in a material is always an ineffectively difficult problem. The agglomeration of the nanoparticles in the material can seriously destroy the insulating properties of the polypropylene.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a method for improving the breakdown field intensity of a polypropylene film based on benzil based on good compatibility of the benzil and a polypropylene material.
The purpose of the invention is realized by the following technical scheme:
a method for improving the breakdown field strength of a polypropylene film based on benzil comprises the following steps:
(1) dry polypropylene granules were mixed with benzil according to a 99.5: fully mixing the components in a mass ratio of 0.5 in an internal mixer to obtain the polypropylene composite material; meanwhile, a control group, i.e., a polypropylene material to which no benzil was added, was set.
(2) The polypropylene composite material was pressed into a sample having a side length of 90X 90mm and a thickness of 80 μm by a press vulcanizer.
(3) The sample was vacuum dried for 24 hours to remove impurities from the sample sufficiently.
(4) Performing a direct current breakdown test on the sample by using a ball plate electrode;
(5) repeating steps (2) - (4) for a sample of the control polypropylene material.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the method can obviously improve the breakdown field strength of the polypropylene film, and has important significance for improving the operation voltage of the capacitor and the safe and stable operation of the capacitor.
Drawings
FIG. 1 shows the chemical formula of benzil.
FIG. 2 is a Weibull distribution diagram of the DC breakdown field strength of a polypropylene composite sample.
FIG. 3 is a Weibull distribution diagram showing the DC breakdown field strength of polypropylene samples.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The method for improving the breakdown field strength of the polypropylene film based on benzil comprises the following steps:
1. dried polypropylene particles were mixed with benzil (formula: fig. 1) according to 99.5: and (3) fully mixing the components in a mass ratio of 0.5 in an internal mixer for 10 minutes at the temperature of 180 ℃ and the rotating speed of the internal mixer of 30r/min to obtain the polypropylene composite material.
2. Setting a comparison group, melting and mixing the dried polypropylene particles in an internal mixer for 10 minutes at the temperature of 180 ℃ and the rotating speed of the internal mixer of 30r/min to obtain the polypropylene material.
3. Weighing 5 g of polypropylene composite material, placing the polypropylene composite material in a flat vulcanizing machine, and preheating for 10 minutes at 180 ℃ to fully melt the polypropylene composite material; pressurizing to 30MPa by a vulcanizing press, raising the temperature to 190 ℃, and pressing for 10 minutes; and (4) closing the power supply of the vulcanizing press, maintaining the pressure unchanged, naturally cooling the sample to room temperature, and taking out. The sides of the test piece were 90X 90mm and the thickness was 80 μm.
4. The sample was placed in a vacuum oven set at 80 ℃ and vacuum-dried for 24 hours to sufficiently remove impurities.
5. And measuring the direct-current breakdown voltage of the sample by using the ball plate electrode, and calculating the breakdown field intensity according to the breakdown voltage and the thickness of the sample.
6. Repeat steps 3-5 for the control polypropylene sample. The Weibull distribution plots of the DC breakdown field strength of the polypropylene composite samples and the control polypropylene samples are shown in FIGS. 2 and 3.
The present invention is not limited to the above-described embodiments. The foregoing description of the specific embodiments is intended to describe and illustrate the technical solutions of the present invention, and the above specific embodiments are merely illustrative and not restrictive. Those skilled in the art can make many changes and modifications to the invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. A method for improving the breakdown field strength of a polypropylene film based on benzil is characterized by comprising the following steps:
(1) dry polypropylene granules were mixed with benzil according to a 99.5: fully mixing the components in a mass ratio of 0.5 in an internal mixer to obtain the polypropylene composite material;
(2) setting a control group, namely a polypropylene material without benzil;
(3) pressing the polypropylene composite material into a sample with the side length of 90 multiplied by 90mm and the thickness of 80 mu m by a flat vulcanizing machine;
(4) placing the sample in a vacuum box with the temperature set to 80 ℃, and carrying out vacuum drying for 24 hours to remove impurities in the sample;
(5) performing a direct current breakdown test on the sample by using a ball plate electrode;
(6) repeating steps (3) - (5) for the control group of polypropylene material.
2. The method as claimed in claim 1, wherein the polypropylene particles and benzil in step (1) are mixed in an internal mixer at a temperature of 170 ℃ and 180 ℃ for 10-20 minutes at a speed of 30 r/min.
3. The method for improving breakdown field strength of polypropylene film based on benzil as claimed in claim 1, wherein when the control group is set in step (2), the polypropylene material is obtained by melting and mixing the dried polypropylene particles in an internal mixer for 10 minutes at 180 ℃ and 30r/min of the internal mixer.
4. The method for improving the breakdown field strength of the polypropylene film based on benzil as claimed in claim 1, wherein in the step (3), 5-10 g of the polypropylene composite material is weighed and placed in a vulcanizing press, and preheated at 180 ℃ for 10-20 minutes to fully melt the polypropylene composite material; pressurizing to 28-30MPa by a vulcanizing press, raising the temperature to 190 ℃, and pressing for 10 minutes; and (4) closing the power supply of the vulcanizing press, maintaining the pressure unchanged, naturally cooling the sample to room temperature, and taking out.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811445278.4A CN109593271B (en) | 2018-11-29 | 2018-11-29 | Method for improving breakdown field strength of polypropylene film based on benzil |
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| CN201811445278.4A CN109593271B (en) | 2018-11-29 | 2018-11-29 | Method for improving breakdown field strength of polypropylene film based on benzil |
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| CN109593271A CN109593271A (en) | 2019-04-09 |
| CN109593271B true CN109593271B (en) | 2021-07-06 |
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| CN112768235B (en) * | 2020-12-23 | 2022-05-17 | 天津大学 | Method for optimizing crystallization morphology of polypropylene film for capacitor |
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| US9070491B2 (en) * | 2012-09-17 | 2015-06-30 | Sabic Global Technologies B.V. | Polymer nanocomposites for electronic applications |
| CN103965543B (en) * | 2014-05-21 | 2016-08-24 | 哈尔滨理工大学 | A kind of high voltage direct current cable cross-linkable polyethylene insulation material |
| US10636575B2 (en) * | 2016-02-12 | 2020-04-28 | Capacitor Sciences Incorporated | Furuta and para-Furuta polymer formulations and capacitors |
| CN108395601A (en) * | 2018-02-27 | 2018-08-14 | 天津大学 | The method that benzil derivatives inhibit high voltage direct current cable space charge |
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