The lignin sulfonic acid sodium is a kind of anion surface-active agent made of sulphite whose main raw material is the northeast white pine, following the process of concentration, sugar-exclusion, displacement, etc.

It is used in dyestuffs industry mainly. This product has many kinds of different function, for instance viscidity control, colour adjusted etc., but main function is the scattering of the dyestuffs, this product has hydrophilic and hydrophobia radicel. It creates double membrane layers when interacting with the moisture molecular. Prevent the dyestuffs particle from condensing once again to improve grinding.