Research progress in cellulose fiber preparation with alkali/urea aqueous solution at low temperature

Cellulose is a resource which is most likely to replace the petroleum,but cellulose can neither dissolve in common solvent nor be melt-spun due to its special structure,which seriously limits the industrial development of these nor be strong polar polymers. Therefore,green high-efficiency preparation methods of cellulose fiber have become hot spots of research all over the world. Based on the new dissolving technology of cellulose in alkali/urea aqueous solution at low temperature,the spinning engineering experiments of cellulose have been investigated systemically in our country,including batch process,continuous process and continuous in-situ chemical modification process. The results showed that the strong shear stress of twin screw extruder can obviously increase the dissolving efficiency and solubility of cellulose,enhance the evenness of the solution,as well as prolong the gelating time of solution,and as such the continuous and stable spinning of cellulose dopes with high concentration is achieved.