Antistatic TPE raw materials
The usual plastics belong to polymer materials. The size of the surface resistance determines whether the plastic(TPE) is insulated, antistatic or conductive. The surface resistance of plastics is more than 12 power of 10. Therefore, plastics have good insulation properties.
The concept of plastic antistatic: When the surface resistance value of plastics and products: greater than 10 times, it is easy to generate static electricity; It has a certain anti-static performance between 8-10 power; Good antistatic performance between 6-8 power; Have the best antistatic performance between 4-6 power; When it reaches 4 power, it has considerable conductive properties and belongs to conductors and semiconductor materials.
In general, TPE has a surface resistance greater than 12 power of 10 and has good insulation. However, due to different environmental media(such as temperature, relative humidity) in different regions, the same TPE material is placed in different environments, and the antistatic properties tested are also quite different. In general, the lower the relative humidity, the drier the climate, and the worse the antistatics of the material. Therefore, when assessing the antistatic performance requirements of the product, full consideration should be given to its use environment.
By adding antistatic additives, the surface resistance of the TPE material can be adjusted to a suitable range to increase the antistatics of the TPE product.
The English name of the antistatic agent is Antistatic agent, abbreviated as ASA. Surface active antistatic agents can be divided into cationic, anionic and non-ionic. What is the role of antistatic agents in the TPE industry?
Antistatic agents generally have the characteristics of surfactants, structural polar groups and Non-Polar groups. Commonly used polar groups are: anions of carboxylic acids, sulfonic acids, sulfuric acids, phosphoric acids, cations of amine salts, quaternary ammonium salts, and-OH,-O-and other groups. Commonly used Non-Polar groups(ie, hydrophilic or hydrophobic groups) are: alkyl, alkyl aryl, etc.. Antistatic agents can be divided into two types: external coating type and internal mixing type. The external coating antistatic agent refers to a class of antistatic agent used on the surface of a polymer material to form an antistatic coating after being dried at room temperature or hot air. This kind of cationic antistatic agent. Although external antistatic agents are suitable for a variety of polymers, their effectiveness is only temporary, and it is easy to lose after contact with solvents or friction with other substances.
The internal mixing antistatic agent refers to a class of antistatic agent added to the resin during the processing of the product. The resin and the antistatic agent with a mass of 0, 3 % to 3 % and 0 % are often mechanically mixed and processed. This kind is mainly non-ionic and polymer permanent antistatic agents, and the yin and cation types can also be added and used in some varieties. Various antistatic agent molecules can give a certain degree of lubrication to the surface of polymer materials, reduce friction coefficient, inhibit and reduce electrostatic charge generation.
TPE antistatic materials generally refer to the addition of 0.5 % -2 % of non-ionic antistatic agents to the TPE raw material mixture. After the product is made into a product, the antistatic agent will migrate to the surface of the product, thereby absorbing the moisture in the air, so that the surface resistance of the product reaches 10-10 times to achieve antistatic effect. The migration process of antistatic agents can be maintained for about 3 to 6 months, and its antistatic effect is generally about half a year. Of course, it can also increase the timeliness by increasing the amount of its antistatic agent, but in this case, the surface of the product will produce frosting(whitening). This is also the biggest defect in the promotion of antistatic agents in the TPE industry.
Antistatic agent in the current thermoplastic elastomer TPE industry, can be used as a sliding agent, demolding agent to widely use. Recommended addition 0.02 % -0.1 %
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