Low Degree Of Polymerization Of Synthesis Of Quaternary Ammonium Type Cationic Chitosan And Salt-free Dyeing Applications

In this paper,Methylol dimethyl ammonium chloride production by formaldehyde anddimethylamine,and make sure the best process conditions: Mole ratio of formaldehyde withdimethylamine is1.2:1,we know this reaction need2hour under the ice-bath with nitrogenprotection of the environment. After using hydrochloric acid to adjust pH about1～4,thencontinue to reaction1hour.Due to thechitosan poorly soluble in water So N-acetylation ofchitosan was synthesized using low degree of chitosan and acetic anhydride,The properprocess conditions were reached that the mass ratio of acetic anhydride with hypoglycemic is0.6:1,the temperature is20℃with the reaction time of8h smoke about drying product.Low degree of polymerization of quaternary ammonium type cationic quaternaryammonium salt of chitosan(HECC)was successfully synthesized using hydroxymethyldimethyl ammonium chloride and N-acetylation of chitosan.Make sure the optimaltechnology conditio: reaction temperature40℃, the reaction time of6hour, the mass ratio ofhydroxymethyl dimethyl ammonium chloride with N-acetylated chitosan is1.4:1. Low degreeof polymerization of quaternary ammonium type cationic quaternary ammonium salt ofchitosan(HBCC)was successfully synthesized using hydroxymethyl dimethyl ammoniumchloride and primary hydroxyl acetylation N-acetylation of chitosan.Make sure the optimaltechnology conditio:reaction temperature40℃,the reaction time of6hour,the mass ratio ofhydroxymethyl dimethyl ammonium chloride with primary hydroxyl acetylationN-acetylation of chitosan is1.6:1.Dyeing the linen fabric was pretreated by HBCC、HECC which dye liquor made up ofvital red B-3G.The influence of the flax fabric dyeing by different dyeing auxiliaries,Theresults show that the substitution degree was0.71HECC processing of flax fabric dyeing rateis43.26%, the fixation rate was77.6%, reach level5washing fastness, dry rubbing fastnessreach level5, tear strength476.3N/476.3N.Substitution degree of0.61HBCC processing offlax fabric dyeing rate is39.7%,the fixation rate was73.9%,reach level5washing fastness,dry rubbing fastness reach level5,tear strength462.5N/462.5N.In this paper,the new type of chitosan quaternary ammonium salt HECC,HBCC graftedflax fabric has detailed research on improve dyeing properties.