Capacitor film with homogeneous ethylene / alpha olefin copolymer as substrate and preparation method thereof

Abstract

The invention discloses a capacitor film with homogeneous ethylene / alpha olefin copolymer as substrate and a preparation method thereof. The capacitor film comprises the following raw materials by weight: 60-65 parts of homogeneous ethylene / alpha-olefin copolymer, 23-28 parts of LDPE (low density polyethylene), 10-15 parts of homo-polypropylene, 3-5 parts of epoxy linseed oil, 2-3 parts of polyving akohol, 1-2 parts of aluminum hydroxide, 1-2 parts of polyisobutylene, 8-12 parts of diatomite, 1-2 parts of ferrocene, 1.4-1.6 parts of poly-4-methyl-1-pentene, 0.7-0.9 part of zinc oxide, 1.2-1.4 parts of talcum powder, 2.3-2.5 parts of resorcinol, 1.3-1.8 parts of dimethyl isophthalate, 2-4 parts of stearic acid, 0.9-1.1 parts of methyl triethoxysilane and 2-4 parts of modified wood ash. The invention mainly adopts homogeneous ethylene / alpha-olefin copolymer assisted with low density polyethylene; and various accessories and additives are subjected to mixing and extrusion, blown film sizing and cutting to prepare the capacitor film. The preparation method is simple; and diatomite, talcum powder and modified wood ash are added into the raw materials at the same time to enhance barrier property and air tightness of the film; besides, the capacitor film has characteristics of good pressure resistance, impact resistance, high heat sealing strength, and good heat sealing performance.

Description

technical field [0001] The invention relates to a capacitor film material, in particular to a capacitor film with a homogeneous ethylene / alpha olefin copolymer as a matrix and a preparation method thereof. Background technique [0002] Film capacitors use metal foil as an electrode, which is stacked with plastic films such as polyethylene, polypropylene, polystyrene or polycarbonate from both ends, and wound into a cylindrical capacitor; in all Among the plastic film capacitors, the characteristics of polypropylene (PP) capacitors and polystyrene (PS) capacitors are the most significant. Of course, the price of these two capacitors is also relatively high. The quality of the capacitor film directly affects the service life and product performance of the capacitor. The demand for films is large and there are many types. It is difficult to meet the requirements of the market by using a single raw material to produce films, but each raw material has its shortcomings, so the pro...

AI Technical Summary

Problems solved by technology

[0002] Film capacitors use metal foil as an electrode, which is stacked with plastic films such as polyethylene, polypropylene, polystyrene or polycarbonate from both ends, and wound into a cylindrical capacitor; in all Among the plastic film capacitors, the characteristics of polypropylene (PP) capacitors and polystyrene (PS) capacitors are the most significant. Of course, the price of these two capacitors is also relatively high. The quality of the capacitor film directly affects the service life and product performance of the capacitor. The demand for films is large and there are many types. It is difficult to meet the requirements of the market by using a single raw material to produce films, but each raw material has its own shortcomings, so the produced films are difficult to meet the needs of various situations