Flame-retardant modified isotactic polypropylene metallized film for capacitors and preparation method thereof

Abstract

The invention discloses a flame retardant modified isotatic polypropylene metallized thin film used for capacitors. The flame retardant modified isotatic polypropylene metallized thin film used for capacitors is prepared from following raw materials, by weight, 200 parts of isotatic polypropylene, 3 to 4 parts of hydrotalcite powder, 1 to 2 parts of ammonium triphosphate, 2 to 3 parts of 1,3-phenylene bis(diphenylphosphate), 10 to 12 parts of waste polyethylene resin particle, 1 to 2 parts of magnesium stearate, 3 to 4 parts of white oil, 3 to 5 parts of allyl glycidyl ether, 1 to 2 parts of methoxy-4-methylphenol, and 5 to 6 parts of an auxiliary agent. According to a preparation method of the flame retardant modified isotatic polypropylene metallized thin film, impurities in the raw materials are removed via filtration, so that performance of the raw materials is excellent, rejection rate of the flame retardant modified isotatic polypropylene metallized thin film is reduced, and break of the flame retardant modified isotatic polypropylene metallized thin film is not easily caused; corona treatment is adopted, so that compressive strength of the flame retardant modified isotatic polypropylene metallized thin film is increased, and breakdown is avoided; the preparation method is simple; the capacitors prepared of the flame retardant modified isotatic polypropylene metallized thin film are low in contact resistance, excellent in flame resistance and product characteristics, and low in production cost.

Description

technical field [0001] The invention relates to the field of capacitor manufacturing, in particular to a flame-retardant modified isotactic polypropylene metallized film for capacitors and a preparation method thereof. Background technique [0002] Biaxially oriented polypropylene film for capacitors has high mechanical and electrical properties. Compared with capacitors made of ordinary films, capacitors made of polypropylene films have low thermal shrinkage, stable performance, and high temperature resistance. High and other significant advantages make the capacitors made of polypropylene film more and more widely used. [0003] The capacitor core is the heart of the capacitor, so the material of the capacitor manufacturing core must be resistant to high frequency, high [0004] High temperature, flame retardant, and a high-molecular polypropylene film that can withstand the impact of large currents is used as the medium to ensure the long-term and stable operation of the...

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Problems solved by technology

Since the whole machine in the market is oriented towards ultra-thin and micro-miniature development, although the foil film composite material has a strong current-carrying and electric resistance capability, its disadvantage is that it is large in size and is not conducive to the use of the whole machine. Another disadvantage is that polypropylene film and aluminum foil Composite rolling and other processes are difficult to control, especially in the process of winding the core, due to the difference in hardness and toughness of the two materials, there will be gaps between the film and foil, so that the heat shrinkage of the material is not sufficient when setting the shape, resulting in a gap between the film and foil. It is easy to be broken down by electricity, and the scrap rate is high, resulting in waste of cost