Analysis of the factors influencing the antistatic

2022-07-27
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Analysis: factors affecting the antistatic effect of plastics

the function of antistatic agent is to reduce its surface resistance. Reduce or eliminate the static charge on the plastic surface. Therefore, the antistatic effect of plastics is affected by many factors. For internal mixing type, the compatibility between antistatic agent and plastic directly affects the antistatic performance of plastic. The compatibility is too good, and the migration of antistatic agent molecules is difficult due to the attraction between molecules; If the compatibility is too poor, the antistatic agent will quickly precipitate out of the surface, resulting in excessive seepage, which will not only affect the appearance and processability of the product, but also shorten the antistatic validity. If this is necessary, the antistatic agent should have appropriate compatibility with plastics in actual use. When the surface antistatic agent is exhausted, the internal antistatic molecules can seep out of the surface in time to restore the antistatic effect. Generally, ionic antistatic agent shall be used for polar resin, and low polarity non-ionic antistatic agent shall be used for weak plate steel wire due to the electronic signal or non throwing grease resistance of the tensile force sensor

the glass transition temperature (T) of plastics directly affects the migration speed of antistatic molecules. For plastics below room temperature, the intense movement of their linked molecules is conducive to the surface migration of internal antistatic agent molecules. For example, PE, PP and other plastics, their antistatic properties are relatively easy to maintain, while for some plastics above room temperature, such as PS, PVC, ABS and so on. It is difficult for antistatic agents to migrate to the surface because their molecular chains are frozen

the interaction between antistatic agent and other plastic agents will also affect its antistatic performance. Such as adding antistatic agent and lubricant at the same time. The interaction between antistatic agents and halogen-free flame retardants must be considered when compounding them. In addition, the crystallinity of the plastic, the addition amount of antistatic agent and many external factors, especially the relative temperature of the environment, have different effects on the antistatic effect of the plastic. The fixture should be kept clean at any time

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