Dimethyl octadecyl ammonium chloride (DDAC) is a quaternary ammonium salt surfactant, which includes a tetraquark ion and an octadecyl chain in its molecular structure. DDAC exhibits excellent bactericidal and algicidal properties and maintains stability under various alkaline and acidic conditions.

DDAC is widely used in fields such as disinfection, cleaning, and preservation. It can be applied in the processing of raw materials like disinfectants, cellulose, and cotton, as well as in petrochemical production. Additionally, due to its excellent anti-fouling properties, it is also suitable for industrial applications such as water treatment, metal processing, pulp production, and asphalt emulsification.

Note that DDAC, as a chlorinated surfactant, has some environmental impact. Compliance with relevant regulations and standards is required when using it, and enhanced safety measures should be taken to minimize environmental pollution and health risks to personnel. Additionally, DDAC is highly corrosive, so it should be handled with care, avoiding contact with skin and mucous membranes.