Contact Electrification Characteristics of Polytetrafluoroethylene and Metal

Abstract

In industrial production, the contact electrification phenomenon between materials will cause equipment damage and bring potential safety hazards to personnel, so it is necessary to study the contact electrification mechanism of materials. In order to explore the contact electrification characteristic mechanism between polytetrafluoroethylene and brass, aluminum alloy, a contact separation electrification test platform was built to pay attention to the change rule of surface potential of composite materials under contact pressure, environmental relative humidity, temperature and material temperature difference. The test results show that the surface potential first increases and then decreases slightly with the increase of contact pressure, and the surface potential is stable when the contact pressure is greater than 7 KN; The contact electrification of materials decreases with the increase of relative humidity; At 15°C ~35°C, the material surface potential is proportional to the temperature; With the temperature difference between the two test materials becoming larger, the contact potential shows a law of first increasing and then decreasing. Through the analysis of the contact electrification characteristics of materials under different conditions, it can provide a direction for further research on the contact electrification mechanism and industrial electrostatic protection.