A kind of preparation technology of chitosan oligosaccharide modified cotton fiber

Abstract

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.

Description

[0001] 1. Technical field [0002] The invention belongs to the technical field of cotton fiber modification, and in particular relates to a method and technology for modifying cotton fiber with chitosan oligosaccharide. [0003] 2. Background technology [0004] The main component of cotton fiber, cellulose, is a high molecular polymer composed of D-glucose linked by β-1,4 glycosidic bonds. Due to the presence of a large number of hydrophilic hydroxyl groups in the cellulose molecules, cotton fiber products have good moisture absorption and air permeability, plus they are soft and warm, and become important raw materials for the textile industry. However, cotton fibers also have defects such as poor elasticity, easy to wrinkle, easy to take shape and shrink after washing, and poor shape retention; especially some microorganisms adsorbed on cotton fibers can use the water adsorbed by cellulose hydroxyl groups to reproduce and grow. Secretes enzymes that degrade β-1,4 glycosidi...

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are: ① the cotton fiber is oxidized by sodium periodate, and the C of the glucopyranose ring is broken. 2 -C 3 bond, which not only opens the glucopyranose ring, but also destroys the crystal structure of cellulose, resulting in the deterioration of the mechanical properties of cotton fibers, that is, the breaking strength and elongation at break are significantly reduced

②This method uses reagents such as sodium periodate to oxidize cellulose, the process is cumbersome and complicated, the waste liquid is difficult to degrade, and the discharge may seriously pollute the environment

③Periodic acid is expensive and the production cost is high, which is not conducive to product promotion and application

The disadvantages of this method are: ① Chitosan diffuses into cotton fibers, and the two only undergo adsorption; because cotton fibers have crystalline regions and amorphous regions, the former has a tight structure, and chitosan is difficult to enter, while the latter is relatively loose, and the shell Polysaccharide is easy to enter, which makes it difficult for chitosan to distribute evenly in cotton fibers, which in turn leads to non-uniformity in its mechanics and dyeing properties, which affects product quality; moreover, since chitosan is only bound to cellulose by adsorption, washing It is easy to fall off, and the functional half-life of the fabric is significantly reduced

②Plasma treatment of dry cotton fiber adsorbed chitosan belongs to solid-solid reaction, and the mass transfer resistance is extremely large; in addition, the orientation of the plasma reaction is poor, so the grafting effect is poor