CN109659135B - Method for improving direct-current breakdown field strength of capacitor dielectric film based on benzoin - Google Patents
Method for improving direct-current breakdown field strength of capacitor dielectric film based on benzoin Download PDFInfo
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- CN109659135B CN109659135B CN201811445277.XA CN201811445277A CN109659135B CN 109659135 B CN109659135 B CN 109659135B CN 201811445277 A CN201811445277 A CN 201811445277A CN 109659135 B CN109659135 B CN 109659135B
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- polypropylene
- sample
- benzoin
- field strength
- composite material
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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
Abstract
The invention discloses a method for improving direct-current breakdown field strength of a capacitor dielectric film based on benzoin, which comprises the following steps: 1. the dried polypropylene pellets were mixed with benzoin in a 99.5: and (3) 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, namely a polypropylene material without benzoin is 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. The dc breakdown test was performed on the sample using a ball panel electrode. 5. Repeat steps 2-4 for a control sample of 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 breakdown field strength of a capacitor dielectric film, in particular to a method for improving direct-current breakdown field strength of the capacitor dielectric film based on benzoin.
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 mostly 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 direct-current breakdown field strength of a capacitor dielectric film based on benzoin based on good compatibility of the benzoin and a polypropylene material.
The purpose of the invention is realized by the following technical scheme:
the method for improving the direct-current breakdown field strength of the capacitor dielectric film based on benzoin comprises the following steps:
1. the dried polypropylene pellets were mixed with benzoin in a 99.5: and (3) 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, namely a polypropylene material without benzoin is 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. The dc breakdown test was performed on the sample using a ball panel electrode.
5. Repeat steps 2-4 for a control sample of 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 benzoin.
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 direct-current breakdown field strength of the capacitor dielectric film based on benzoin comprises the following steps:
1. dried polypropylene particles were mixed with benzoin (chemical formula shown in 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 sample. 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 diagrams of the DC breakdown field strength of the polypropylene composite sample and the control polypropylene sample are shown in the attached figures 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 (2)
1. The method for improving the direct-current breakdown field strength of the capacitor dielectric film based on benzoin is characterized by comprising the following steps of:
(1) the dried polypropylene pellets were mixed with benzoin in a 99.5: fully mixing the components in a mass ratio of 0.5 in an internal mixer to obtain the polypropylene composite material; fully mixing the polypropylene particles and benzoin in an internal mixer for 10-20 minutes at the temperature of 180 ℃ and the rotating speed of the internal mixer of 30 r/min;
(2) setting a control group, namely a polypropylene material without benzoin;
(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; weighing 5-10 g of polypropylene composite material, placing the polypropylene composite material in a flat vulcanizing machine, and preheating for 10-20 minutes at 180 ℃ 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; closing the power supply of the vulcanizing press, keeping the pressure unchanged, naturally cooling the sample to room temperature, and taking out the sample;
(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 for improving direct-current breakdown field strength of capacitor dielectric films based on benzoin 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 10-20 minutes at 180 ℃ and 30r/min of the internal mixer rotation speed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811445277.XA CN109659135B (en) | 2018-11-29 | 2018-11-29 | Method for improving direct-current breakdown field strength of capacitor dielectric film based on benzoin |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811445277.XA CN109659135B (en) | 2018-11-29 | 2018-11-29 | Method for improving direct-current breakdown field strength of capacitor dielectric film based on benzoin |
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| CN109659135A CN109659135A (en) | 2019-04-19 |
| CN109659135B true CN109659135B (en) | 2021-01-05 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5674915A (en) * | 1979-11-22 | 1981-06-20 | Origin Electric | Method of manufacturing film capacitor |
| CN104641424A (en) * | 2012-09-17 | 2015-05-20 | 沙特基础全球技术有限公司 | Polymer nanocomposites for electronic applications |
| CN105801968A (en) * | 2016-04-12 | 2016-07-27 | 安徽春辉仪表线缆集团有限公司 | Nano-magnesia doped polyethylene direct-current cable composite with good compactness and preparation method of composite |
| CN106543747A (en) * | 2016-10-26 | 2017-03-29 | 安徽飞达电气科技有限公司 | A kind of metallized membrane capacitance embedding material |
| 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 |
-
2018
- 2018-11-29 CN CN201811445277.XA patent/CN109659135B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5674915A (en) * | 1979-11-22 | 1981-06-20 | Origin Electric | Method of manufacturing film capacitor |
| CN104641424A (en) * | 2012-09-17 | 2015-05-20 | 沙特基础全球技术有限公司 | Polymer nanocomposites for electronic applications |
| CN105801968A (en) * | 2016-04-12 | 2016-07-27 | 安徽春辉仪表线缆集团有限公司 | Nano-magnesia doped polyethylene direct-current cable composite with good compactness and preparation method of composite |
| CN106543747A (en) * | 2016-10-26 | 2017-03-29 | 安徽飞达电气科技有限公司 | A kind of metallized membrane capacitance embedding material |
| 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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Granted publication date: 20210105 Termination date: 20211129 |