The main component of detergents is surfactant, which is an organic compound containing two parts of the molecular structure that are hydrophilic and oil-friendly. In general, according to whether the surfactant can be decomposed into ions in aqueous solution, it is divided into two categories: ionic surfactant and non-ionic surfactant. Ionic surfactants can be divided into three kinds: cationic surfactant, anionic surfactant and amphoteric surfactant.