Long-life polyester material for capacitor film

Abstract

The invention discloses a long-life polyester material for a capacitor film. The long-life polyester material is prepared from polyester, polyacrylamide, polytetrafluoroethylene, glycidyl methacrylate, tributyl citrate, glass fibers, magnesium borate whiskers, dibutyl phthalate and modified starch. The components of the polyester material for the capacitor film act in a combined manner, the polyester serves as a main raw material, the polyacrylamide, the polytetrafluoroethylene, the glycidyl methacrylate, the tributyl citrate, the glass fibers, the magnesium borate whiskers, the dibutyl phthalate and the modified starch serve as auxiliary materials, the advantages of the polyester are brought into full play, the tensile resistance of the capacitor film is improved, the high-temperature resistance of the capacitor film is enhanced, loss coefficient is reduced, and particularly, the service life of the capacitor film is remarkably prolonged by synergistic effects of the magnesium borate whiskers, the glycidyl methacrylate and the tributyl citrate.

Description

technical field [0001] The invention relates to the field of capacitors, in particular to a high-life polyester material for capacitor films. 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. Capacitors made of polypropylene films have low thermal shrinkage, stable performance, high temperature resistance, high pressure resistance, and prevent breakdown. And other significant advantages, making the use of capacitors made of polypropylene film more and more widely. The capacitor core is the heart of the capacitor. Therefore, the core material of the capacitor must have high-frequency resistance, high temperature resistance, and a high-molecul...

AI Technical Summary

Problems solved by technology

The capacitor core is the heart of the capacitor. Therefore, the core material of the capacitor must have high-frequency resistance, high temperature resistance, and a high-molecular polypropylene film that can withstand the impact of large currents as the medium, so as to ensure the long-term stable operation of the whole machine. However, the current When some film capacitors are used under high-frequency or high-pulse conditions, the pulse current passing through the capacitor will cause the capacitor itself to heat up and the temperature will rise, resulting in problems such as increased self-healing points, reduced withstand voltage, and shortened life. Short, which directly leads to short service life of the capacitor