Abstract:

N-hydroxypropyl lauryl dimethyl ammonium chloride chitosan (HDCC) was prepared by introducing epoxypropyl lauryl dimethyl ammonium chloride to the amino-group of chitosan (CTS) with a degree of deacetylation about 85%, and then HDCC with good water solubility was crosslinked with N-hydroxymethyl acrylamide (NMA), thus obtained the end product of a novel chitosan derivative O-acrylamidomethyl-N-[(2-hydroxy-3-dodecyl ammonium) propyl] chitosan chloride (NMA-HDCC) that can form covalent bond with cellulosic fiber. The antibacterial experiment demonstrated that the cotton fabrics treated with CTS, HDCC and NMA-HDCC all showed above 95% bacteria inhibiting ratio against Bacillus coli, and HDCC, in particular, showed nearly 100%. After 30 washing cycles, the cotton fabric treated by NMA-HDCC exhibited above 85% bacteria inhibiting rate, though those treated by CTS, chitosan quaternary ammonium salt exhibited little effect. For durable antibacterial effect, the optimal process conditions for treating cotton fabrics with NMA-HDCC were determined as follows: mass concentration of finishing agent, 2 g/L, curing at 140℃ for 5 min.