Nantong Bao Jian: analysis of the generation and harm of static electricity

Electrostatic generation:

in daily life, electrostatic phenomenon is very common. 1n the dry air area, when people dress and strip, pull the door by hand, walk on the plastic floor or composite carpet, touch other objects, they often produce static electricity, which makes people feel paralyzed. Relevant experts have done the test, using a glass rod to rub on the chemical fiber cloth for 20 times, and immediately using the instrument to measure, the results show that the maximum voltage can reach 15kV. The main factors of producing static electricity are as follows< Material properties include chemical composition, internal structure, mechanical properties, material shape and conductivity. 1f the material is a conductor, the charge moves freely on its surface, and the distribution of the charge on the whole surface tends to be uniform, rather than staying at a local position where the charge is generated. This kind of charge can only produce a lower voltage, any part of the conductive material contact with the ground can immediately make the charge on the material to the ground. Different insulation materials, such as paper, plastic film and other materials, produce static electricity to form a higher voltage, which can not be eliminated by grounding< The surrounding environment includes gas composition, pressure, temperature, humidity, etc 3. The mechanical action situation includes the contact type, time, area, separation speed and force properties of the two materials. 1n general, the closer the two materials are in contact or the faster the separation speed is, the greater the static electricity will be generated. Static electricity is static relative to the frequently used power electricity. The current is small and does not form a loop. 1t is characterized by movement and friction, which will produce static electricity. Sometimes the potential is as high as several thousand or tens of thousands of volts. 1t disappears rapidly after discharge and cannot be transported and distributed electrostatic hazards: with the wide application of polymer materials, electrostatic problems become increasingly prominent, which not only cause spark discharge and fire and explosion accidents due to electrostatic, but also affect product quality, damage electronic devices, data loss, etc. The hazards and accidents caused by electrostatic discharge can be roughly divided into three categories: 1. production failure2. Fire and explosion; 3. Second disaster caused by human electrostatic shock. Due to the increase of various disasters and production accidents caused by static electricity, the harm and prevention of static electricity has become a growing concern. Relevant national standards also clearly stipulate that anti-static work clothes must be worn when working in electronic industry, petrochemical industry, aerospace and other fields

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