Regenerated cellulose spinning solution and its solvent and preparation method

Abstract

The invention discloses a regenerated cellulose spinning stock solution and solvent and process for preparation, wherein the solvent comprises the components with the following weight percentage: 10-70 percent of aprotic transfer polar solvent, 30-90 percent of N-methylmorpholine oxide, N-methylmorpholine oxide hydrate or other mixture, and the water content of the solvent is less than 15 percentof the weight percentage. Using the invention, the lysis time of the N-methylmorpholine oxide mixture is reduced, the amount of N-methylmorpholine solvent is reduced, the solution temperature is reduced, the energy of heating dissolution is saved, the degradation of the N-methylmorpholine and cellulose are reduced, thereby the loss proportion of the N-methylmorpholine oxide in a circulation process is reduced, compared with the prior art, the process for preparation of the spinning stock solution is more simple, simultaneously, the problems of high melting point of solution and high viscosityare solved, the production cost is saved, and the quality and physical properties of a product is increased. Further, according to the requirements of the viscosity of conventional spinning solution,the concentration of high spinning stock solution is capable of being improved, thereby improving the yield and economics.

Description

A kind of regenerated cellulose spinning stock solution and its solvent and preparation method technical field The invention relates to chemical fiber spinning, in particular to a regenerated NMMO (N-methylmorpholine-N-oxide, methylmorpholine-oxide) cellulose spinning dope, a solvent and a preparation method thereof. Background technique NMMO is an excellent solvent for cellulose, easily soluble in water, easily soluble in polar organic solvents such as ethanol and methanol, and has high solubility in hot acetone and benzene, but insoluble in general organic solvents. It can be combined with 1-4 water molecules, and its chemical properties are relatively stable at room temperature; in general, especially in industrial applications, NMMO is NMMO monohydrate (NMMO·H2O) or NMMO dihydrate (NMMO·H2O). 2H2O) is widely used, and occasionally NMMO trihydrate (NMMO 3H2O) or NMMO tetrahydrate (NMMO 4H2O) exists. Among them, NMMO monohydrate or NMMO dihydrate is solid, and NMMO trih...

AI Technical Summary

Problems solved by technology

NMMO can form new hydrogen bonds with cellulose hydroxyl groups to make it dissolve, but due to the existence of too many hydrogen bonds, the melting point and viscosity (ie, viscosity) of the solution will be higher

A higher melting point will cause NMMO to easily undergo decomposition reactions, which is not conducive to the recovery and reuse of NMMO; a higher viscosity will lead to a lower concentration of dissolved cellulose in the spinning dope, making processing difficult and affecting output

Images