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Modified polar filler for metallized polypropylene thin film capacitor

A technology of polypropylene film and capacitors, which is applied in the field of fillers, can solve problems such as unsatisfactory, impact on capacitor life, and adverse effects on capacitor insulation performance, and achieve the effects of improving service life, obvious polarity characteristics, and service life

Inactive Publication Date: 2018-12-18
WUXI HONGGUANG CAPACITOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when it is used as a filler for metallized polypropylene film capacitors, it has a great adverse effect on the insulation performance of the capacitor, and it cannot even meet the general requirements of metallized polypropylene film capacitors with shell insulation resistance > 2000 MΩ (500VDC). Industry Standard
In addition, the moisture content in epoxy soybean oil is high, and conventional vacuum refining equipment cannot refine its moisture content to the standard range available for metallized polypropylene film capacitors, and the moisture content of fillers has a great impact on the life of capacitors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: A modified polar filler for metallized polypropylene film capacitors, which is produced by the following process steps:

[0017] (1) Crude oil preheating: put the crude oil of epoxidized soybean oil in a vacuum refiner for heating treatment at a temperature of 70°C until there is no solid matter in the epoxidized soybean oil, that is, all the oil is converted into a liquid state;

[0018] (2) Vacuum refinement: The epoxidized soybean oil preheated in step (1) is subjected to vacuum refinement in a high-altitude oil refiner. The moisture content of oxygenated soybean oil is lower than 100ppm;

[0019] (3) Filler modification: Add antioxidant 1010 (tetrakis[methyl-β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester) and antioxidant 168 (tris(2,4-di-tert-butylphenyl) phosphite), the temperature of the modification treatment is 160°C, and the treatment time is 3 hours; the said The amount of antioxidant 1010 (tetrakis[methyl-β-(3,5-di-ter...

Embodiment 2

[0022] Embodiment 2: A kind of modified polar filler for metallized polypropylene film capacitor, which is made by the following process steps:

[0023] (1) Crude oil preheating: put the crude oil of epoxidized soybean oil in a vacuum refiner for heating treatment at a temperature of 80°C until there is no solid matter in the epoxidized soybean oil, that is, all the oil is converted into a liquid state;

[0024] (2) Vacuum refinement: The epoxidized soybean oil preheated in step (1) is subjected to vacuum refinement in a high-altitude oil refiner. The moisture content of oxygenated soybean oil is lower than 100ppm;

[0025] (3) Filler modification: Add antioxidant 1010 (tetrakis[methyl-β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester) and antioxidant 168 (tris(2,4-di-tert-butylphenyl) phosphite), the temperature of the modification treatment is 180°C, and the treatment time is 2 hours; the said The amount of antioxidant 1010 (tetrakis[methyl-β-(3,5-di-...

Embodiment 3

[0028] Embodiment 3: A kind of modified polar filler for metallized polypropylene film capacitor is made by following process steps:

[0029] (1) Crude oil preheating: put the crude oil of epoxidized soybean oil in a vacuum refiner for heating treatment at a temperature of 75°C until there is no solid substance in the epoxidized soybean oil, that is, all the oil is converted into a liquid state;

[0030] (2) Vacuum refinement: The epoxidized soybean oil preheated in step (1) is subjected to vacuum refinement in a high-altitude oil refiner. The moisture content of oxygenated soybean oil is lower than 100ppm;

[0031] (3) Filler modification: Add antioxidant 1010 (tetrakis[methyl-β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester) and antioxidant 168 (tris(2,4-di-tert-butylphenyl) phosphite), the temperature of the modification treatment is 160°C, and the treatment time is 2.5 hours; the said The amount of antioxidant 1010 (tetrakis[methyl-β-(3,5-di-tert-b...

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Abstract

The invention relates to a modified polar filler for a metallized polypropylene thin film capacitor, wherein the modified polar filler is characterized by being prepared by the following process steps: (1) crude oil preheating; (2) vacuum refining; (3) filler modification: adding a mixed solution of an antioxidant 1010 and an antioxidant 168 to epoxy soybean oil obtained by vacuum refining of thestep (2), wherein the modification treatment temperature is 160-180 DEG C and the treatment time is 2-3 h; (4) carrying out cycle refining of the obtained epoxy soybean oil modified by the step (3) and stabilizing the obtained epoxy soybean oil, and adding a stabilizer in the refining process, wherein the refining temperature is 70-80 DEG C and the treatment time is 1-2 h; and (5) carrying out vacuum treatment and cycle refining of the epoxy soybean oil treated by the step (4), wherein the vacuum degree is required to be less than or equal to 200 Pa, the temperature is 80+ / -5 DEG C, and the treatment time is 1-1.5 hours. The modified polar filler has obvious polarity characteristics, is different from the structure of a non-polar polypropylene thin film, and avoids occurrence of the swelling phenomenon of capacitive elements.

Description

technical field [0001] The invention relates to a filler, in particular to a modified polar filler for metallized polypropylene film capacitors. Background technique [0002] Traditional metallized polypropylene film capacitors use a mixture of salad oil and polyisobutylene as the capacitor filler, but both substances have their own advantages and disadvantages. Among them, salad oil is a polar substance. Although it is incompatible with the non-polar polypropylene base film, it has poor oxidation resistance and is prone to chemical reactions, resulting in an increase in acid value and corrosion of the coating. Polyisobutylene is a non-polar substance, which is "compatible" with the non-polar polypropylene base film. During the long-term use of the capacitor, the outer layer of the capacitor core is likely to swell significantly, thereby affecting the service life of the capacitor. [0003] In recent years, with the development of science and technology and the gradual impr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L91/00C08K5/134C08K5/526
CPCC08K5/1345C08K5/526C08L91/00
Inventor 周定毅匡永正赵志明
Owner WUXI HONGGUANG CAPACITOR