Surfactants include anionic surfactants, cationic surfactants, zwitterionic surfactants, non-ionic surfactants, natural surfactants and biodegradable surfactants.
Anionic surfactants: surface-active ions formed when dissociated in aqueous solution are negatively charged and generally consist of ionic hydrophilic groups and oil-soluble oleophilic groups.
Cationic surfactants are positively charged surfactants that usually have excellent bactericidal and deodorizing properties.
Zwitterionic surfactant: a surfactant with two ionic properties, according to the chemical structure can be divided into: betaine type, amino acid type, phosphate type, imidazoline type and other amphoteric surfactants such as polymers, heteroatoms.
Nonionic surfactants: They are not charged and usually have good wettability and mild surface activity.
Natural surfactants: refers to surfactants derived from plants and animals, usually with high biocompatibility and low toxicity.
Biodegradable surfactants: surfactants that can be degraded by microorganisms under natural conditions, usually with less impact on the environment.