Surfactants can increase the solubility of dyes

2022-04-06 09:19:47

The main purpose of the application of surfactant in leather soaking is to help soften the raw leather and restore the fresh skin state. Therefore, surfactants with good wetting and permeability should be selected, among which the effect of non-ionic surfactants is better. Most commonly used are carboxylate type anionic surfactants and polyoxyethylene type non-ionic surfactants, such as ramibang, Pingjia, etc.

The purpose of using surfactants in the liming process is to enhance the penetration effect of liming materials, shorten the liming process, inhibit the excessive expansion of bare skin, reduce growth trace defects and emulsify natural oil. In the past, polyoxyethylene type nonionic surfactants and carboxylate type anionic surfactants were commonly used.

The new Liming aids are required to promote the absorption of sodium sulfide and sodium hydrosulfide to reduce sulfur pollution; It can increase the solubility of lime to reduce the amount of lime; It can promote hair removal and other properties. Therefore, the newly developed Liming aids are mostly the products of synergistic combination of several surfactants.

One of the main tasks of printing and dyeing process is to avoid uneven dyeing or spots. Leveling agent refers to a kind of auxiliary agent that can delay the speed of dye dyeing on fiber (slow dyeing) and transfer dye from high concentration part to low concentration part (transfer dyeing) on fiber, so as to avoid uneven depth and color spots, and do not reduce the fastness of dyeing.

Surfactants can increase the solubility of dyes, enhance the penetration and adhesion of their fibers, enhance their color and improve the washing resistance of textiles. Some anionic surfactants, such as sodium alkyl sulfonate and sodium sulfate of higher fatty alcohol, can be used as fiber friendly leveling agents for natural fibers and nylon fibers. Higher fatty alcohol polyoxyethylene ether and other non-ionic surfactants are mainly used for reduction dyeing, but also for the dyeing of disperse dyes and direct dyes.