Metallized capacitor film with improved oxidation resistance

Abstract

The invention discloses a metallized capacitor film with improved oxidation resistance. The metallized capacitor film comprises metal plating, a plastic film top layer and a plastic film bottom layer, wherein the plastic film top layer and the plastic film bottom layer are arranged on the two surfaces of the metal plating respectively, the metal plating is made of zinc and / or aluminum, the plastic film top layer and the plastic film bottom layer are made of polyolefin, the plastic film top layer is provided with a contact bottom surface making contact with the metal plating, the plastic film bottom layer is provided with a contact top surface making contact with the metal plating, and the contact bottom surface and the contact top surface have the same surface charge density. According to the metallized capacitor film with improved oxidation resistance, penetrability of charged particles with oxidability in air to the plastic film top layer and the plastic film bottom layer is reduced, the dielectric property of the plastic film top layer and the plastic film bottom layer is improved, and the probability of breakdowns is reduced. The invention further discloses a manufacturing method of the metallized capacitor film with improved oxidation resistance.

Description

technical field [0001] The invention relates to a metallized capacitor film with improved oxidation resistance and a manufacturing method thereof, belonging to the technical field of manufacturing metallized films for capacitors. Background technique [0002] At present, the metallized films used in the manufacture of film capacitors are composite zinc-aluminum metallized films. Aluminum-plated metallized film has good adhesion, and the production process is easy to handle, but aluminum-plated metallized film is easily oxidized in the air to form a dense oxide layer with aluminum oxide as the main component. Although this oxide layer can prevent The metallized film is further oxidized, but when working under AC high voltage and high current, the oxide layer will lead to a rapid decline in the capacity of the capacitor; for this reason, a layer of zinc on the basis of the metallized film can be well prevented. The inner aluminum layer forms an oxide layer, so that the capaci...

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Problems solved by technology

Aluminum-plated metallized film has good adhesion, and the production process is easy to handle, but aluminum-plated metallized film is easily oxidized in the air to form a dense oxide layer with aluminum oxide as the main component. Although this oxide layer can prevent The metallized film is further oxidized, but when working under AC high voltage and high current, the oxide layer will lead to a rapid decline in the capacity of the capacitor; for this reason, a layer of zinc on the basis of the metallized film can be well prevented. The inner aluminum layer forms an oxide layer, so that the capacity of the capacitor does not drop rapidly, but the metallized film galvanized layer is more reductive, and the rate of oxidation in the air is faster, and the zinc oxide formed by oxidation has a fluffy The structure of the metallized film is difficult to prevent further oxidation, so the metallized film galvanized layer is not only difficult to handle during processing, but also easily leads to accidents of heating or even breakdown of the capacitor; for this reason, it is also necessary to coat the metallized film with aluminum and zinc A layer of aluminum is plated on the basis to protect the galvanized layer of the metallized film

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