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Manufacturing Technology Of Antistatic Non-woven Fabric
Jan 09, 2018

We know that static electricity can cause the malfunction of electronic equipment or office automation equipment integrated circuit (IC), and destroy the storage, especially the interference of electromagnetic wave (EMI) and electrostatic induction (ESD). This not only damages semiconductor devices, but also causes accidents. Therefore, the composite materials such as static electric non-woven fabric, thin film, thin sheet and so on are used to shield electromagnetic wave and prevent electrostatic effect, so as to reduce the static electricity.

The non-woven fabrics are naturally charged when they are rubbed. How can the generated static charge leak quickly to avoid static electricity?

The ability of non-woven fabric to leak static charge is related to the specific resistance of non-woven fabrics. In order to make the electrostatic voltage dry without causing an unpleasant level, the specific resistance of non-woven fabrics should be less than 1010 cm. Nonwoven fabrics, which reach this specific resistance level under standard conditions (relative humidity of 65%, 20 degrees C), are called antistatic non-woven fabrics.

Generally, the non-woven fabric is more than 1013 ohm cm above the resistance. Through the moisture absorption modification method and finishing with antistatic finishing agent, the non-woven fabric can achieve the level of antistatic. For example, the antistatic properties of non-woven fabrics can be improved by blending or copolymerization with hydrophilic polyethylene glycol, sodium alkyl sulfonate and so on.

Antistatic finishing agents, mainly metal powder and carbon and other inorganic substances, polysiloxanes, surfactants and so on. At present, the most used is the external antistatic finishing agent. It is used for surface spraying of non-woven fabrics, such as production and processing. As an additive and antistatic finishing agent for synthetic non-woven fabrics, there are anionic, cationic, non-ionic and amphoteric surfactants. Among them, the anionic antistatic agent has good thermal stability and is used for the production and processing of non-woven fabrics. It mainly includes advanced alkyd (salt), aliphatic sulfonate, and advanced acid phosphate (salt). In addition to the use of metal ions such as sodium and potassium, the cationic part of the balanced ion is also used as alkyl alcohol amines such as triethanolamine.

Antistatic finishing agents developed in modern chemical industry have been widely used in non-woven fabrics and plastic products. It plays a very good role in inhibiting the generation, accumulation and dissipation of static electricity. Antistatic finishing agent is a general term for inhibiting the amount of static electricity generated on the surface of materials, such as synthetic resin and other electrical insulation materials, or eliminating the accumulated static electricity. They play a lot of roles in the production, processing and application of non-woven fabrics and synthetic resin films, especially to prevent static electricity generation and accumulation, and to overcome the charge produced by the friction between non-woven fabrics.