New quaternary ammonium salt cationic surfactants with 3 long chain alkyl groups were preparad from 4-alkyldiethylenetriamine and fatty acids through amidation and quaternization.

• 以个长链烷基二亚乙基三胺和脂肪酸为原料，经酰胺化、季铵化合成了6种未见文献报道的三长链烷基季铵盐型阳离子表面活性剂。