Process and devices for chemical modification of cellulose and for continuous low temperature solution spinning

Abstract

The invention provides a process and devices for chemical modification of cellulose and for continuous low temperature solution spinning. The process for the chemical modification of the cellulose and for the continuous low temperature solution spinning comprises: after vacuum drying the cellulose, uniformly mixing the dried cellulose with an ionic liquid and modified small molecules in a certain proportion to obtain a mixture, extruding the obtained mixture by a double-screw extruder, and washing the extruded product successively by water and ethanol solvent, drying, crushing to obtain a modified cellulose powder; adding the modified cellulose powder and a solvent in a certain proportion to a mixing kettle, after stirring and mixing uniformly at the room temperature, carrying out extrusion, deaeration, and filtration by using the double-screw extruder, then putting into a spinning assembly, spaying out of a spinneret of the spinning assembly to obtain fibers, putting the obtained fibers successively into a first coagulation bath and a second coagulation bath to rapidly solidify and stretch into solids, after water washing in a water tank, and winding into modified cellulose fibers. The process and the devices can substantially enhance the spinning efficiency, and improve the cellulose fiber performance.

Description

technical field [0001] The invention belongs to the field of novel green processing of polymer materials, and relates to high-efficiency low-temperature solution spinning of cellulose, in particular to a high-shear chemical modification of cellulose and its continuous low-temperature solution spinning process and equipment. Background technique [0002] Cellulose is a natural polymer compound. The cell walls of higher plants generally contain cellulose. Among them, the cellulose content in cotton is 88%-96%, and the cellulose content in wood and bagasse is about 50%. Compared with other macromolecules, the repeating units of cellulose molecules are simple and uniform, and the molecular surface is relatively flat, making it easy to stretch in the long direction, and there are highly reactive hydroxyl groups on the glucopyranose ring, which makes intra-molecular and inter-molecular It is easy to form hydrogen bonds, which leads to high crystallinity and insoluble and infusible...

AI Technical Summary

Problems solved by technology

Low-temperature alkali urea cellulose fiber has been reported as a pilot line in my country, but limited by the structure of cellulose itself, the solubility of cellulose in low-temperature alkali / thiourea / urea solution is not high, only about 5%, and it is easy to occur Gel is also limited by equipment and technology, the processing process is complicated, and the production energy consumption is very large. These are the two main reasons that restrict the preparation of cellulose fibers by low-temperature dissolution methods.

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