Study on preparation and performance of multi-headgroup quaternary ammonium surfactant.

Congcong Cui; Hongli Zhang; Guangshan Xuan

Bi-headgroup quaternary ammonium surfactant (BTAE-n) and tetra-headgroup quaternary ammonium surfactant (PTAE-n) were synthesized from alkyl halides with different carbon chain length, benzyl chloride and α, α'-dichlorop-xylene. The structure of products was characterized by HPLC, FT-IR, 1H NMR and LC-MS, and the Krafft temperature, emulsifying properties, wetting properties and foam properties of the surfactants were evaluated. The results show that the Krafft temperatures of BTAE-n and PTAE-n are both lower than 0 ℃, indicative of good water solubility and lowtemperature solubility. Compared with benzalkonium chloride, BTAE-n and PTAE-n have better foam stability. Their foaming performance decreases with the increase of carbon number of alkyl chain, while the emulsification performance increases. The results of contact angle measurement show that the wetting ability of BTAE-n is better than that of PTAE-n. According to the evaluation results of bacteriostatic and bactericidal properties, BTAE-n and PTAE-n show effective bacteriostatic and bactericidal activities against gram-positive bacteria(Staphylococcus aureus), gram-negative bacteria (Escherichia coli) and fungi (Candida albicans), and the effectiveness of tetra-headgroup quaternary ammonium salts is better than that of bi-headgroup quaternary ammonium salts with the same carbon chain. For the surfactants of the same type, the bacteriostatic and bactericidal effects are better with the increase of carbon chain length.

FOAM; SURFACE active agents; QUATERNARY ammonium salts; BENZYL chloride; CONTACT angle; BENZALKONIUM chloride; GRAM-positive bacteria; CANDIDA albicans

China Surfactant Detergent & Cosmetics (2097-2806), 2023, Vol 53, Issue 8, p899

2097-2806

Academic Journal

10.3969/j.issn.2097-2806.2023.08.006