Patent ID: 8092732
Filing Date: 2012-01-10
Classification: C08B,C08L,D01F

Abstract:
1. A method for enhancing the antifungal, antibacterial and deodorization capabilities of natural cellulose fiber, comprising: (a) selecting a raw material comprising shells of shrimp, crab and/or other sea crustaceans; (b) extracting the chitin from the raw material; (c) removing the internal N-acetyl groups from the chitin to produce chitosan; (d) deacylating the chitosan by treating the chitosan with heat and NaOH so that the chitosan is from 50 to 99% deacylated; (e)(i) reducing the molecular weight of the chitosan by dissolving the chitosan in a diluted acid solution under a specific temperature for different reacting times so as to obtain various chitosan of middle or low molecular weight, and/or (ii) modifying the chitosan by dissolving the chitosan in a solution of water and methanol, introducing iodomethane (CH (f) nano-miniaturizing the chitosan by a sol-gel method comprising adding an adequate quantity of alkali to the chitosan, and hydrolyzing, condensing, and polymerizing the chitosan; (g) immersing the chitosan in a syrup-like mixture of wood pulp and N-methylmorpholine N-Oxide (NMMO) solvent with a dopant of 1,3-phenylene-bis 2-oxazoline (BOX) stabilizer; (h) mixing the chitosan, wood pulp cellulose, NMMO solvent and BOX stabilizer of step (g) in a horizontal blending machine at a temperature of 60-80° C. to yield quasi-dope, wherein the wood pulp cellulose is either filament fiber or staple fiber with an α-celluose content of over 85% and a degree of polymerization (DP) of between 500-1200; (i) dehydrating the quasi-dope by vacuum film evaporation and thermal treatment at 80-120° C. for 5 minutes to produce a dehydrated dope; (j) spinning the dehydrated dope by a dry-jet wet spinning method comprising forcing the dehydrated dope into a spinning machine and extruding the dehydrated dope into a coagulation bath to produce a filament; (k) removing the filament from the coagulation bath; and (l) rinsing, drying, and applying lubricant to the filament to produce a natural cellulose fiber having enhanced antifungal, antibacterial and deodorant capabilities.