Classification and characteristics of antistatic agentsPlastic sheet extrusion machine

日期:2021/2/25 9:17:35 / 阅读: / 来源:本站

Classification and characteristics of antistatic agents

Plastic sheet extrusion machine


Antistatic agents can be divided into hygroscopic type and surfactant type according to their properties. Hygroscopic antistatic agent has the characteristics of hygroscopic or moisturizing, and can form a layer of water film on the surface of dielectric. Polysiloxanes, polyamines, ethylene glycol, glycerol, sorbitol and inorganic salts belong to this group. The hydrophilic part absorbs water from the air and forms a thin conductive layer on the resin surface to eliminate static electricity. In the case of spraying (external) antistatic agent on the material surface, the antistatic effect of removing the conductive layer formed on the surface due to friction or washing will be significantly reduced, while the surface conductive layer formed by internal antistatic agent will be significantly reduced. It may also be lost, but as new antistatic molecules move quickly from the inside to the surface, it will still be produced. 

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Antistatic effect can be maintained for a long time. External antistatic agents include surfactants, silicone compounds, etc. in addition to surfactants, there are other inorganic substances, such as filler metal powder, carbon black in solid dielectric, etc., which can improve the volume conductivity of antistatic agents. Antistatic agents with surface activity can be divided into cationic, anionic and nonionic types according to their ionic forms. In addition to sodium, potassium and other metal ions, the anionic antistatic agent can also use triethanolamine and other alkyl alcohol amines. The anionic antistatic agent has good thermal stability.Plastic sheet extrusion machine handern.com Cationic antistatic agents are represented by alkyl quaternary ammonium salt and alkyl amine salt, which contain 8-22 carbon. In addition to halogen ions, nitric acid, sulfuric acid and perchloric acid can also be used as equilibrium ions in the anionic part of cationic antistatic agents. This surfactant is the best antistatic agent, but its thermal stability is slightly lower than other types. The non-ionic antistatic agent has good thermal stability and can be used as internal antistatic agent for food packaging film. In addition, high molecular antistatic agent is used in spraying, which has the advantages of durability and washability. Plastic sheet extrusion machine handern.com

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