Industry News

Anti-static Agent structure

2021-07-07
Structure of Anti-static Agent
The Anti-static Agent has both polar groups and non-polar groups. Commonly used polar groups are: carboxylic acid, sulfonic acid, sulfuric acid, phosphoric acid anions, amine salt, quaternary ammonium salt cations, commonly used non-polar groups: alkyl, alkaryl, etc., thus forming fibers The five basic types of ASA commonly used in the industry are amine derivatives, quaternary ammonium salts, sulfate esters, phosphate esters, and polyethylene glycol derivatives. When ASA is used as a coating, the hydrophobic group is adsorbed on the surface of the material, and the outermost layer forms a layer of ASA molecular layer; when the bicomponent fiber is formed by copolymerization, the outer ASA molecular layer is destroyed, and the internal ASA can penetrate To the surface of the material; there is a smooth ASA molecular layer on the surface of the material. The reduction of the surface friction coefficient reduces the chance of static electricity generation. However, the washing fastness of external ASA is not good. Consider using a reactive compound to form a covalent bond with the fiber at high temperature. Combine.External ASA generally uses water, alcohol or other organic solvents as solvents or dispersants to coat the hydrophobic groups on the surface of the material, and the outwardly arranged hydrophilic groups absorb trace moisture in the environment because water has a high dielectric constant. The liquid forms a conductive layer, and the trace electrolyte contained in the fiber also reduces the surface resistance to a certain extent; the ASA used in the fabric is mostly saturated long carbon chain cationic surfactant, which is easy to be adsorbed due to the negative charge on the surface of the fiber. Moisture film, so that the dielectric constant of the material friction gap is also significantly improved; if ASA is an ionic compound, it has an ionic conduction effect. The internal ASA is unevenly distributed in the polymer. When added to a certain amount, the surface of the composite will form a film with hydrophilic groups arranged outward, and the internal ASA can penetrate to the surface to supplement the film. Therefore, the compatibility of ASA and polymer forms two contradictory aspects. Good compatibility will slow down the surface penetration rate, and it is difficult to replenish the loss of surface ASA in time. Otherwise, the material will lose antistatic prematurely performance.

Anti-static Agent