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China Surfactant Detergent & Cosmetics ›› 2020, Vol. 50 ›› Issue (11): 749-755.doi: 10.3969/j.issn.1001-1803.2020.11.003

• Development and application • Previous Articles     Next Articles

Preparation and properties of alkylated chitosan sulfate

JIA Zhen-yong(),LI Ping(),YANG Xiao-yi,GUO Chao-hua,LI Jian-bo   

  1. China Research Institute of Daily Chemistry Co., Ltd., Taiyuan, Shanxi 030001, China
  • Received:2020-02-15 Revised:2020-10-30 Online:2020-11-22 Published:2020-11-20
  • Contact: Ping LI E-mail:jzhyong@163.com;yipingli_@126.com

Abstract:

Two kinds of chitosan surfactants, dodecyl chitosan sulfate (D10CTS) and decyl chitosan sulfate (D12CTS) were synthesized by Schiff base reaction, reduction, sulfation and neutralization reaction. Their structures were identified by infrared spectroscopy (FT-IR), H NMR spectroscopy(1H NMR), elemental analysis (EA), and thermogravimetric analysis (TGA). The results show that the degrees of alkylation are 0.77 and 0.52, and the degrees of sulfation are 1.35 and 1.79, respectively. Favourable surface activity and spreadability of D10CTS and D12CTS were evidenced by surface tension and contact angle measurements. The critical micelle concentrations (cmc) are 0.69 and 0.49 g/L, and the minimum surface tension γcmc are 39.50 and 35.75 mN/m, respectively. The target products possess certain foaming properties and emulsification performance. The surfactants are low-foaming and are expected to play a potential application in the field of cosmetics.

Key words: chitosan surfactant, degree of alkylation, degree of sulfation, low-foaming surfactant

CLC Number: 

  • TQ423