BOTAI cellulose ether is a general term for a series of products generated by the reaction of alkali cellulose and etherifying agents under certain conditions, including methyl cellulose ether(MC), hydroxyethyl methyl cellulose ether(HEMC), hydroxypropyl methyl cellulose ether(HPMC), hydroxyethyl cellulose ether(HEC) and other types of cellulose ether. It has the functions of thickening, water retention, air entrainment, and retarding coagulation, and can be widely used in building materials, industry and other fields.