椰油酰胺丙基甜菜鹼

 Cocamidopropyl Betaine

Cocamidopropyl Betaine (CAPB) is a mixture of organic compounds derived from coconut oil and dimethylaminopropylamine. This compound is presented as a viscous pale yellow solution, mainly used as a surfactant in personal care products and animal husbandry. The name CAPB reflects that the major part of the molecule, the lauric acid group, comes from coconut oil. CAPB has largely replaced cocamide DEA as a surfactant and detergent, featuring a long hydrocarbon chain and a polar group, effectively reducing surface tension in water and enhancing cleaning efficiency.

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Used as a foam booster in shampoos
Serves as a medium-strength surfactant in hand cleaning and bathing products
Acts as an emulsifying agent and thickener in cosmetics, reducing irritation caused by purely ionic surfactants
Functions as an antistatic agent in hair conditioners, usually without irritating skin or mucous membranes

CAPB is not synthesized from betaine but produced in two steps. Initially, dimethylaminopropylamine (DMAPA) reacts with fatty acids from coconut or palm kernel oil (mainly lauric acid or its methyl ester) to form an amide. Then, chloroacetic acid reacts with the remaining tertiary amine to form a quaternary ammonium center (quaternization reaction).

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