Basic principles of electrostatic protection
All matter in nature is composed of atoms. Protons (positive charges) and electrons (negative charges) in atoms exist in every corner of our lives. It can be said that static electricity is everywhere, everywhere. It always exists around everything in our lives. It is difficult to completely eliminate static electricity during the electrostatic protection process, but we can take protective measures to minimize the generation and accumulation of static electricity. After years of research and practice by scientists and engineers, the results show that Two basic principles for protecting against electrostatic hazards:
1 Use or install static-sensitive components in a static-safe area.
2 Transport electrostatic sensitive components with electrostatic shielding containers
Surfactant-type antistatic agents have many disadvantages during use, such as lack of permanent antistatic effect, deterioration of surface due to precipitation, thermal decomposition during processing, and high dependence on temperature and humidity. The above problems can be solved by using various hydrophilic polymers as antistatic agents. The addition of various hydrophilic polymers such as polyethylene oxide (PEO) as a conductive unit to the matrix resin to form an alloy permanently maintains an antistatic effect. These hydrophilic compounds containing conductive units are distinguished from low molecular weight surfactant-type antistatic agents by a high molecular weight, and are called polymeric permanent antistatic agents.
The effect of the polymeric antistatic agent alloyed with plastic depends on its degree of dispersion and dispersion in the resin. The ideal distribution state is that the antistatic agent is finely distributed in the matrix resin, and its shape is in the form of a rib or a mesh, forming a path for leaking charges. The realization of this distribution state depends on the compatibility and processing conditions of the polymeric antistatic agent and the matrix resin. A suitable compatibilizer can be selected to adjust the particle size of the antistatic agent dispersion, and the proper viscosity difference between the parent component and the dispersed phase is controlled by controlling the shear rate and the processing temperature. In the microdomain structure thus controlled, the antistatic agent forms a good "conductive path". Anti-static bag
In addition to being added to a resin to form a polymer alloy having an antistatic effect, a polymeric antistatic agent is also increasingly used for coating. If a polymer containing a quaternary ammonium ion conductive unit is used as a coating of a thin plastic article (sheet, film, etc.), it exhibits good antistatic properties.