Modified silicon oil for oil type antioxidant thin film of metalized capacitor

Abstract

The invention relates to modified silicon oil for an oil type antioxidant thin film of a metalized capacitor and relates to the technical field of capacitors. The thin film is prepared from the following components in parts by weight: 35-45 parts of methylsilicone oil, 4-6 parts of diphenyldimethoxysilane, 1-3 parts of epoxy resin, 4-6 parts of peanut oil, 4-6 parts of methyltrissilane, 1-2.5 parts of a coupling agent, 2-3 parts of paroline, 2-3 parts of hexamethyldisiloxane and 2-3 parts of a crosslinking agent. The modified silicon oil provided by the invention is simple in component, low in cost, non-toxic and free of corrosion and impurities and has a good using performance. A silicon oil protective layer is arranged on the whole metal layer to be isolated from air to prevent aluminum and zinc from being oxidized by air, so that the oxidation resistance of the metalized thin film is improved and the thin film is prevented from being oxidized and broken down in the process of manufacturing a capacitor, thereby greatly improving the quality of the capacitor which is manufactured by using the metalized film. Meanwhile, the problem that a large-capacity capacitor is too large in capacity and heat is hard to emit so as to lead to breakdown is solved. The oil protective layer has the compact binding and radiating functions and is capable enhancing the firmness among the plated layers, so that the metal layer is effectively prevented from falling.

Description

technical field [0001] The invention relates to the technical field of capacitors, in particular to a modified silicone oil for metallized capacitor oil-type anti-oxidation film. Background technique [0002] The existing film for metallized capacitors is to use a coating machine to coat metal plates under high vacuum conditions on the base film as a dielectric material. The plates can be divided into two layers: aluminum coating and zinc coating, because of their unique With self-healing properties, it is widely used in the manufacture of various types of AC capacitors and DC filter capacitors for power compensation or motor starting. The unique self-healing properties of metallized film may significantly improve and increase the voltage resistance and service life of metallized film capacitors. Since the melting point of zinc is lower than that of aluminum, it is easier to play a role in the thermal breakdown of capacitors and has better self-healing properties. Therefore...

AI Technical Summary

Problems solved by technology

[0003] However, due to the extremely poor adhesion of the zinc coating on the surface of the film, aluminum must be evaporated first and then zinc. Zinc is easily oxidized in the air, and the oxidized zinc-aluminum film will cause the capacitor to fail. The storage environment of a good zinc-aluminum metallized film has strict temperature and humidity requirements

At the same time, in order to ensure the uniformity and density of the aluminum coating in the zinc-aluminum coating, the amount of aluminum coating must reach a certain amount, and the increase in the amount of aluminum coating will reduce the self-healing performance of the metallized thin film, and also affect the withstand voltage characteristics of the film. Affect capacitor quality and service life

Therefore, it is necessary to coat a protective layer of oil on the surface of the metal film, and the traditional method is to use a single-component silicone oil, and the effect is not very satisfactory.