Process for the preparation of anti-fibrillating cellulose fibers by the dry-spray-wet method

Abstract

The invention provides a method for preparing antigenic fibrillating cellulose fibers by a dry-jet wet process. The method includes the steps: (1) uniformly mixing ionic liquid with celluloses, and gradually increasing the temperature to 50-130 DEG C under the vacuum condition and by means of stirring to enable the celluloses to be dissolved so that cellulose solution with the draft ratio more than or equal to 5 is obtained, wherein the weight ratio of the celluloses to the ionic liquid is 7:93-20:80, and the temperature of the melting point of the ionic liquid is not more than 50 DEG C; and (2) by the dry-jet wet process, enabling the cellulose solution to pass through spinneret orifices and enter clearances in the size of 50-300mm prior to more than 5 times of draft, solidification, washing, winding and drying so that the antigenic fibrillating cellulose fibers are prepared, wherein the winding speed is 15-120m / min. The antigenic fibrillating cellulose fibers prepared by the method are excellent in performance, and the method is low in pollution and energy consumption.

Description

technical field [0001] The present invention relates to a method for preparing anti-fibrillating cellulose fibers by a dry-spray-wet method. Background technique [0002] Cellulose is one of the most abundant renewable resources on earth. The fibers prepared from it include viscose fiber, cupro fiber and Lyocell fiber, among which viscose fiber includes viscose filament and viscose cord , ordinary viscose staple fiber, high wet modulus viscose staple fiber and other varieties. [0003] With the progress of society and the increasing awareness of environmental protection, the problems of high pollution and high energy consumption in the preparation process of viscose fiber have attracted more and more attention. While these problems have seriously restricted the further wide application of viscose fiber, they have also inspired Expectations and concerns for new solvent-processed cellulose fibers. Research on new solvent-based cellulose fibers has never stopped. People have ...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the solvent used has a long carbon chain, which is difficult in terms of solvent synthesis and recovery, cellulose dissolution and spinning; and the fiber cannot be drawn at a large ratio, so it is difficult to efficiently prepare finer fineness. Cellulose fiber; at the same time, the fibrillation index of the fiber prepared by this method is generally ≤3 or ≤2, and the anti-fibrillation performance is still inferior to that of viscose fiber

[0008] The patent with the application number CN200680048725.1 mentions the use of ionic liquids as solvents for wet spinning to prepare cellulose fibers with a fibrillation index ≤ 2, wherein the cations are imidazolium cations, and the anti-fibril properties of the cellulose fibers prepared by this method Compared with the NMMO solvent dry spray wet cellulose fiber, the fiberization performance is somewhat improved, but it is still far from the anti-fibrillation performance of the viscose fiber. At the same time, the wet method is far behind the dry spray wet method in terms of spinning speed