In recent years, people have done more research on the phenomenon of static electricity, the use of static electricity and the harm of static electricity. As the use of static electricity, the can-making process in the paint industry has adopted the electrostatic spraying process, and other industries have many applications such as electrostatic dust prevention, electrostatic flocking, and electrostatic copying. However, with the development of paint production, people pay more and more attention to the hazards of static electricity. A large number of flammable solvents and organic powders are used in paint production. The existing production sites are crowded and the production equipment is not closed. Once the static electricity generated in the production process accumulates to a certain strength, it will cause many harms. In the past, due to our lack of understanding of the hazards of static electricity, the factors that generate static electricity and the methods of elimination have not been fully grasped, so accidents caused by static electricity in the coating industry, especially fire accidents, continue to occur. We must fully understand the hazards of static electricity, master the safety measures and technologies to eliminate static electricity, and do a good job in the safety of paint production.

Friction can generate static electricity. When two substances continue to rub, one substance transfers electrons to the other substance to be positively charged, and the other substance gets electrons to be negatively charged, generating static electricity. However, the amount of electrostatic charge carried by a substance is not only determined by the generation of static electricity, but also by the dissipation of static electricity. If there are sufficient dissipation conditions, even if the static charge is generated, it cannot be accumulated. The resistivity of a substance is an important factor that determines the dissipation and accumulation of static electricity. It can be seen from experiments that even if a substance with a resistivity between 10⁶-10⁸ ohm·cm accumulates static charges, it can dissipate instantly without causing any harm; substances with a resistivity between 10⁹-10¹⁰ ohm·cm usually have little charge. ; The material with resistivity in 10¹¹-10¹⁵ ohm·cm is easy to be charged with static electricity but not easy to dissipate, so it will accumulate static electricity, which is the key object of anti-static work. When the resistivity is greater than 10¹⁵ ohm·cm the object is not easy to generate static electricity when it is centimeters. But once it is charged with static electricity, it is difficult to eliminate it. Most of the main raw materials used in the paint industry have a resistivity between 10-10 ohms, which is easier to generate and accumulate static charges, as shown in Figure 2-4: