Insulators are prone to generate static charges in dry […]
Insulators are prone to generate static charges in dry air due to friction, which causes great harm to processing and use. The method to prevent static electricity is essentially to reduce or prevent friction to reduce the generation of static charge, or to quickly leak the static charge through various ways. At 20°C, if the ρs of the polymer sample is lower than 1010Ω, it can be considered that the polymer has good antistatic properties: if ρs=1010-1012Ω, it can be considered that the polymer has good antistatic properties. Electrostatic properties; when ρs=1012-1014Ω, it can be considered that the polymer has a moderate antistatic effect; when ρs=1014-1015Ω, there is only a weak antistatic effect; when ρs is higher than 1015Ω, it is considered that there is no antistatic effect . At present, the processing methods of antistatic polyolefin composites mainly include the addition of conductive fillers, the addition of antistatic agents, and the blending with structural conductive polymer materials.
Such methods incorporate inorganic conductive fillers into a matrix of polyolefin materials. At present, filling with carbon black is the most widely used, because carbon black raw materials are easy to obtain, cheap, lasting and stable in electrical conductivity, and can greatly adjust the electrical conductivity. The volume resistance of carbon black itself is between 0.1 and 10.2Ω, and it is a natural semiconductor. In the resin composite, when the carbon black particles are in contact with each other to form a network network or the gap between the carbon black particles is several 10-10m, a conductive path can be formed. Therefore, the composite antistatic polymer material filled with carbon black is an antistatic material with a wide range of uses and a large amount. Metal fillers can also be used, mainly including metal powders (Ag, Cu, Al, Ni, etc.), metal fibers (copper fibers, aluminum fibers, stainless steel fibers, alloy fibers, etc.) and metal oxides.