Abstract

A fabrication of natural cellulose fiber with flame-retarding capability comprises following steps. Blend pulp and solvent of N-methylmorpholine N-oxide (NMMO) to form slurry. Evaporate extra water content from slurry by a Thin Film Evaporator (TFE) to form dope. By Dry-Jet Wet Spinning, spin and extrude dope for coagulating and regenerating. Water-rinse and dry to form natural cellulose fiber. Soaking roll natural cellulose fiber by flame retardant of N-(hydroxymethyl)-3-(methoxy phosphorus acyl). Orderly dry, bake, neutralize, soaping clean, water rinse, baking dry, soaking rolled, alkaline clean, water rinse, dry and oil the natural cellulose fiber to produce natural cellulose fiber of flame retarding capacity. Because of cross-linking reaction for the flame retardant of N-(hydroxymethyl)-3-(methoxy phosphorus acyl) with natural cellulose fiber, the flame-retarding capability thereof meet requirements of testing standards in American ASTM D6413-1999 and ASTM D2863-1995. Moreover, the wastes thereof meet the requirements of environment protections without harm.

IPC Classes  ?

• D01D 5/06 - Wet spinning methods
• D01F 2/00 - Monocomponent artificial filaments or the like of cellulose or cellulose derivativesManufacture thereof
• D01D 10/02 - Heat treatment
• D01D 7/00 - Collecting the newly-spun products
• D01F 2/02 - Monocomponent artificial filaments or the like of cellulose or cellulose derivativesManufacture thereof from solutions of cellulose in acids, bases, or salts
• D01D 10/06 - Washing or drying
• D01D 5/26 - Formation of staple fibres
• D01F 1/07 - Addition of substances to the spinning solution or to the melt for making fire- or flame-proof filaments
• D06M 13/282 - Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials with non-macromolecular organic compoundsSuch treatment combined with mechanical treatment with compounds containing sulfur or phosphorus with compounds containing phosphorus
• D01F 13/02 - Recovery of starting material, waste material or solvents during the manufacture of man-made filaments or the like of cellulose, cellulose derivatives, or proteins

Abstract

The present invention provides a processing method of the natural cellulose fiber with feature for enhancing the capability of antifungi, antibacteria and deodorization. The procedure is that firstly modify and reduce the properties of the natural chitosan of high polymer material to nanometer scale; secondly dunk the chitosan into the syrup-like mixture of wood pulp and NMMO solvent to yield quasi-dope; thirdly dehydrate the quasi-dope of paste mixture to form the mud-like dope; fourthly spin the dope by dryjet wet spinning method; fifthly regenerate the filament in coagulation bath, water rinse and dry; finally water rinse, dry, apply the lubricant to finish. The water soluble chitosan, which has been treated by property modification and reduced to nanometer scale, can effectively and completely solve in the cellulose of low DP to offer wider extent of selection in the DP and better flexibility of adding percentage in content of modified chitosan.

IPC Classes  ?

• B29C 47/00 - Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor (extrusion blow-moulding B29C 49/04)
• C08B 37/08 - ChitinChondroitin sulfateHyaluronic acidDerivatives thereof
• D01D 5/12 - Stretch-spinning methods
• C07H 1/00 - Processes for the preparation of sugar derivatives