In industry, there are many ways to prevent static electricity in plastics, the main ones are:
1. Reduce or reduce friction to reduce static electricity generation. The accumulation of charge reduces the friction speed and the friction coefficient, which can achieve this purpose, but it will inevitably lead to the decline of production, which is unrealistic. In addition, adding a medium (oil) with a large dielectric constant e to the contact surface gap of the friction can also reduce the accumulation of charge, but this method can only be used in certain occasions and has no universal significance.
2. Through graft copolymerization, the main body in the plastic - polymer with more polar groups or ionized groups, reduce resistance, increase conductivity, reduce electrostatic generation and charge accumulation. This method is more troublesome, and will change the structure of the polymer, which is bound to damage other properties, and is rarely used.
3. The use of conductive devices in the plastic molding process to eliminate static electricity as much as possible is difficult to achieve in practice.
4. Improve the relative humidity of the plastic processing and product use environment to prevent the accumulation of static electricity. It is only suitable for hydrophilic materials and has little effect on hydrophobic materials.
5. Adding conductive fillers such as metal powder to the plastic can also prevent the accumulation of static electricity, which brings difficulties to the molding process, and may also affect other properties of the product. Therefore, it is rarely used in practice.
6. Oxidize the surface of the product with a strong oxidizing agent, or treat the surface of the product with corona discharge to generate polarity, increase conductivity, and reduce the accumulation of charge. Doing so is bound to increase equipment and processes, which is not economical, and the effect is not ideal, which is rarely used in reality.
7. The use of antistatic agent This method is simple and easy, the effect is good, and it is often used.