Application of antistatic agents in PVC

PVC material has excellent electrical insulation. It is easy to accumulate static electricity through friction during use, causing the material to cause static electricity hazards.

Because PVC will degrade and produce acidic substances during processing, which can easily react with alkaline substances. Therefore, when selecting alkaline amine antistatic agents, attention should be paid to the problem of reducing the efficacy of the additive due to the reaction.
　　It can be seen from the electrical sequence table of polymer materials that when PVC materials rub against each other, negative charges will be generated. In order to form a directional arrangement of antistatic agents in PVC plastics, cationic antistatic agents are generally used, and the most commonly used are quaternary ammonium salts. When PVC generates negative charge due to friction, the charge will be adsorbed on the positively charged part of the lipophilic group of the quaternary ammonium salt, and the negatively charged part of the hydrophilic group will be directionally exposed to the air, absorbing water molecules, forming a path for static electricity leakage, and achieving the purpose of antistatic.
　　Because cationic antistatic agents have poor compatibility with PVC, have poor heat resistance and bleed out quickly in PVC plastics, a single cationic antistatic agent is rarely used in practical applications. Several antistatic agents are usually mixed to give full play to their synergistic effect. For example, using a nonionic antistatic agent with a cationic antistatic agent can improve the thermal stability of the antistatic agent.
　　Since all antistatic agents will increase the rate of dehydrochlorination of PVC, thereby reducing the processing stability of PVC plastics. Therefore, the stabilizer component in the antistatic PVC formula should be appropriately increased. HDC-308 produced by our company is an antistatic agent specially used for PVC materials and is a yellow liquid.