Preparation process of chitosan oligosaccharide modifying cotton fiber

The invention relates to a preparation process of a chitosan oligosaccharide modifying cotton fiber, and relates to method and technology for modifying a cotton fiber by using chitosan oligosaccharide. The method comprises the following steps: firstly preparing a pretreated cotton fiber by taking the chitosan oligosaccharide and the cotton fiber as raw materials; then reacting epoxy chloropropane and the chitosan oligosaccharide to prepare hydroxypropyl chitosan oligosaccharide; then respectively carrying out etherifying modification on the pretreated cotton fiber by using the hydroxypropyl chitosan oligosaccharide and bis-glycidyl ether successively to prepare an etherate grafted with a hydroxypropyl chitosan oligosaccharide cotton fiber; and finally preparing a chitosan oligosaccharide modifying cotton fiber product through baking treatment. The preparation process disclosed by the invention has the characteristics of moderation in reaction condition, high specificity, simplicity for operation, low cost, convenience for popularization and application and the like. The product prepared by adopting the method has the advantages of antibacterial property and permanent dyeing property and can be widely applied to the fields of spinning, medicines, foods and the like.