PVC material has excellent electrical insulation, and it is easy to accumulate static electricity through friction in the process of use, so as to cause electrostatic hazards.
Because hydrogen chloride acid substance will be produced during PVC processing, it is easy to react with alkaline substance. Therefore, attention should be paid to the problem of reducing the efficacy of additives due to reaction when selecting Alkaline Amine antistatic agent products.
It can be seen from the electrical sequence list of polymer materials that when PVC materials rub with other materials, negative charges will be generated. In order to form a directional arrangement of antistatic agents in PVC plastics, cationic antistatic agents are generally selected, and quaternary ammonium salts are used most. When PVC generates negative charge due to friction, the charge will be adsorbed on the positive part of the lipophilic group of quaternary ammonium salt, and the negative part of the hydrophilic group will be directionally exposed to the air to absorb water molecules, forming a path of electrostatic leakage, so as to achieve the purpose of antistatic.
Because of the poor compatibility between cationic antistatic agent and PVC, poor heat resistance and rapid exudation in PVC plastics, single cationic antistatic agent is rarely used in practical application, and several antistatic agents are usually mixed to give full play to their synergistic effect. For example, the use of non-ionic antistatic agent and cationic antistatic agent can improve the thermal stability of antistatic agent.
All antistatic agents can increase the speed of dehydrochlorination of PVC, thus reducing the processing stability of PVC plastics. Therefore, the stabilizer component of antistatic PVC formula should be increased appropriately.