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English
The function of antistatic agents is to reduce their surface resistance. Reduce or eliminate electrostatic charge on plastic surfaces. Therefore, the antistatic effect of plastics is affected by many factors. For the internal mixing type, the compatibility between the antistatic agent and the plastic directly affects the antistatic performance of the plastic. If the compatibility is too good, it will be difficult for the antistatic agent molecules to migrate due to intermolecular attraction; if the compatibility is too poor, the antistatic agent will quickly precipitate on the surface, causing excessive bleeding, which not only affects the appearance and processability of the product, but also shortens the antistatic validity period. Therefore, in actual use, antistatic agents and plastics must have moderate compatibility. When the surface antistatic agent is depleted, the internal antistatic molecules can seep out of the surface in time to restore the antistatic effect. Generally, ionic antistatic agents should be used for polar resins, and non-ionic antistatic agents with low polarity should be used for weak or non-polarizing resins. The glass transition temperature (T) of plastics directly affects
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The rate at which antistatic agents migrate from the interior of the polymer to the surface depends on many factors. These factors include: 1. The relative affinity between the antistatic agent and the polymer material
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Plastics have excellent electrical insulation properties. This is because most of their molecular chains are composed of covalent bonds, which can neither ionize nor transfer free electrons. Therefore, once they are charged due to the gain and loss of electrons during friction, it is difficult to disappear through conduction. This is why plastics are easily electrostatically charged.
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