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Method for rapid determination of electrothermal aging of polypropylene film for capacitors and its application and verification method

A polypropylene film and capacitor technology, which is applied in the preparation of test samples, environmental/reliability testing, etc., can solve the problems of increasing verification costs, hardening of polypropylene films, and increasing the risk of production and use, so as to reduce verification The effect of reducing costs, shortening verification time, and improving yield

Active Publication Date: 2021-01-05
ANHUI TONGFENG ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is that the existing indexes for evaluating polypropylene films cannot reflect the electrical and thermal aging properties of polypropylene films for capacitors. After the polypropylene films are made into capacitors, it takes 500 or 1000 hours according to the standard In order to draw the conclusion whether the durability index of polypropylene film for capacitors is qualified or not, it increases the cost of verification and increases the risk of production and use. Therefore, the applicant wonders whether the verification time can be shortened, so three groups of polypropylene film The films are recorded as Group A, Group B and Group C, and each group of polypropylene film is cut into two parts, one part for making capacitors is recorded as Group A1, Group B1 and Group C1, and the other part is reserved as Group A2, Group B2 and Group C2 , wherein Group A1 and Group B1 are polypropylene films that have passed the standard test, and Group C1 is unqualified polypropylene film. Groups A2, B2 and C2 are found through various tests. When the test conditions are heating at a certain temperature Groups A2 and B2 did not change for a certain period of time, while the polypropylene film of group C2 hardened, and the heating time was much shorter than the 500h or 1000h required by the standard test, so the temperature and time node for hardening of the polypropylene film was found The relationship between the capacitor's capacity decay rate and the hardening mechanism is that some macromolecular chains are broken into small molecular chains during the process of making polypropylene film from polypropylene particles in the C2 group of polypropylene films, and these small molecular chains It will volatilize under specific heating conditions, causing the polypropylene film to harden. Therefore, the capacity decay rate of the capacitor is used as the basis for measuring the durability index of the polypropylene film, and the polypropylene film for the capacitor is subjected to separate heat treatment to determine whether the bending angle α is If it is greater than 30°, the corresponding relationship between the bending angle and the capacity decay rate of the capacitor is established. This is the core innovation point of the present invention. For this purpose, a method for quickly determining the electrothermal aging of polypropylene film and its application are provided.

Method used

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  • Method for rapid determination of electrothermal aging of polypropylene film for capacitors and its application and verification method
  • Method for rapid determination of electrothermal aging of polypropylene film for capacitors and its application and verification method

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Embodiment 1

[0013] Embodiment 1: A method for quickly determining the electrothermal aging of a polypropylene film, which includes the following steps: (1), cutting the 10-layer polypropylene film into a sample block whose length and width are 200*10mm; (2), cutting the polypropylene film Place the sample block in an oven at 120°C for heat treatment for 6000 minutes; (3) Place the heat-treated polypropylene film sample block on the test bench, and the length of the sample block placed on the test bench is L1, L1≤1 / 3 polypropylene film sample block length, and place a pressure block on the polypropylene film sample block, and observe the angle α between the line connecting the lowest point and the highest point of the part L2 of the polypropylene film sample block beyond the test bench and the horizontal plane of the test bench, if α≤30 ° means that the electrothermal aging performance of the polypropylene film is unqualified, and the polypropylene film such as figure 1 Shown; if α>30°, th...

Embodiment 2

[0014] Embodiment 2: A method for quickly determining the electrothermal aging of polypropylene film, which includes the following steps: (1), cutting the 30-layer polypropylene film into a sample block whose length and width are 200*300mm; (2), cutting the polypropylene film Place the sample block in an oven at 130°C for heat treatment for 800 minutes; (3) Place the heat-treated polypropylene film sample block on the test bench, the length of which is placed on the test bench is L1, L1≤1 / 3 polypropylene film sample block Length, and place a pressure block on the polypropylene film sample block, observe the angle α between the part L2 of the polypropylene film sample block beyond the test bench and the test bench, if α≤30°, it indicates the electrothermal aging performance of the polypropylene film failed.

Embodiment 3

[0015] Embodiment 3: A method for quickly determining the electrothermal aging of polypropylene film, which includes the following steps: (1), cutting the 60-layer polypropylene film into a sample block whose length and width are 500*10mm; (2), cutting the polypropylene film Place the sample block in an oven at 140°C for heat treatment for 360 minutes; (3) Place the heat-treated polypropylene film sample block on the test bench, the length of which is placed on the test bench is L1, L1≤1 / 3 polypropylene film sample block length, and place a pressure block on the polypropylene film sample block, and observe the angle α between the line connecting the lowest point and the highest point of the part L2 of the polypropylene film sample block beyond the test bench and the horizontal plane of the test bench, if α≤30 ° then it shows that the electrothermal aging performance of the polypropylene film is unqualified.

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Abstract

The invention discloses a method of rapidly determining electrothermal aging of a polypropylene film for a capacitor, usage and a verification method thereof. The method comprises the steps of (1) cutting 10-100 layers of polypropylene film sample pieces; (2) putting the sample pieces of the polypropylene film in a stove for thermal treatment; and (3) observing the surface of the thermal treated polypropylene film sample piece so as to determine whether electrothermal aging performance of the polypropylene film is qualified. The existing method needs to make a finished product capacity and then takes 500-1000 hours to test the durability of the polypropylene film. The method overcomes the above defect and is characterized in that the polypropylene film sample is prepared separately, then after thermal treatment, a tester can rapidly determine whether the polypropylene film is durable by using sensing organs, thereby greatly shortening verification time, lowering verification cost, andincreasing yield rate of the capacitor.

Description

technical field [0001] The invention relates to the field of capacitor preparation, in particular to a method for judging the electrothermal aging of a polypropylene film used as a capacitor insulating material and an application and verification method thereof. Background technique [0002] With the rapid development of industry, the demand for capacitors in rail transit, SVG, solar photovoltaic, smart grid, household appliances and other fields is increasing, and polypropylene film is widely used as the insulating dielectric material in capacitors. Polypropylene film will inevitably be exposed to light, oxidation, thermal degradation, etc. during use and storage, and will undergo aging processes. The performance of the aging film declines, which seriously affects the performance of polypropylene plastics. Due to the complexity of its aging mechanism, it is still difficult to directly study the film performance changes caused by various aging reasons, but it is analyzed an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/30
CPCG01R31/003
Inventor 储松潮胡志坤潘毓娴陈翠玉
Owner ANHUI TONGFENG ELECTRONICS