Synthesis And Application Of A Water-Soluble And Cellulose-Reactive Chitosan Derivative

A novel chitosan derivative was synthesized in two steps from the chitosan.N-[(2-hydroxy -3-trimethylammonium)propyl]chitosan chloride(HTCC)was prepared by introducing quaternary ammonium salt groups on the amino groups of chitosan.This derivative was further modified by introducing functional(acrylamidomethyl) groups on the primary alcohol groups(C-6) of the chitosan backbone.The novel chitosan derivative O-acrylamidomethyl-N-[(2-hydroxy-3-trimethylammonium )propyl]chitosan chloride(NMA-HTCC) is water-soluble in a varied pH value.The degree of deacetylation(DD) of chitosan(about 85%) is determined by acid base titration.The cotton treated with CTS,HTCC,NMA-HTCC showed above 95%bacterial reduction. The activity of NMA-HTCC was maintained over 90%after 30 consecutive washing.While the antibiotic activity of CTS,HTCC was weaked greatly.The dip-pad-bake treatment of NMA-HTCC showed a better performance than the cold-dip-pad treatment.The salt-free reactive dyeing properties of the CTS,HTCC,NMA-HTCC pretreatment of cotton and no-treat cotton are compared.Results showed that the pretreatment had a better effect on pick-up,fixation,K/S value.The NMA-HTCC pretreatment dip-pad-bake presented the better performance on rob fastness and soap fastness.According to the tea pigment dyeing,the most appropriate dyeing process with mordant agent was confirmed firstly.Under this process,the pretreatment cotton dyeing method with no mordant agent was compared with the most appropriate dyeing method.The result showed that the pretreatment dyeing method had the same even better performance on K/S value,rob fastness, soap fastness.According to the wool dyeing with acid dye,the most approporiate pretreatment method was determined through experiments before the dyeing process.In the following dyeing process,the pretreatment wool showed a better pick-up and the same soap fastness.