PP separator is a kind of separator made by dissolving polypropylene resin into microfiber, making felt-shaped, adding a certain amount of filler, lubricant and antioxidant, and then hot rolling; PP separator has good chemical stability and strong oxidation resistance in acidic media. The PP separator is made of ultra-fine glass fiber as raw material, and is made by emulsification, washing, drying and other processes.
With the continuous progress of battery technology, the requirements for separators for batteries are getting higher and higher. Lead-acid batteries are developing towards the trend of high rate discharge, high reserve capacity, vibration resistance, long life and high production efficiency. The traditional battery separator can no longer meet the requirements of the battery, and the battery failure caused by the separator is more and more, mainly in several aspects.
All kinds of raw materials are mixed and used evenly according to the requirements of the production formula, because in the production of PP separator, there are a large number of silica and raw material oil added, so special attention should be paid to the control of mixing time and feeding sequence to ensure that the raw materials meet the requirements. The mixed raw material is fed into the extruder by a feeder, and the sheet is extruded by a special twin-screw extruder and pressed into shape by the molding machine.
In the extrusion process, there is a secondary refueling treatment, because the molecular weight polyethylene and silica itself does not have fluidity, so it is necessary to rely on the extruder forced extrusion to be continuously formed, the main purpose of refueling is to reduce the friction between raw materials and machinery in the molding process, improve the fluidity of the melt, PP separator after the formation of the thickness gauge detection, into the oil pumping process for oil pumping treatment.