A kind of preparation method of rare earth modified regenerated cellulose fiber

Abstract

The present invention provides a preparation method of rare earth modified regenerated cellulose fibers. The obtained fibers have a dry strength of 2.12-2.64 cN / dtex, a wet strength of 1.05-1.58 cN / dtex and an elongation at break of 16.3-20.1%. By modifying the rare earth, the rare earth ion interacts with the amide group in the grafted protein, and the carbonyl oxygen on the amide group coordinates with the rare earth to form a hydrogen bond, making the rare earth more stable and not easily affected by acid and alkali; Spectral analysis and detection show that the loss rate of rare earth elements in the regenerated cellulose fibers prepared by this method is less than 0.1%; the rare earth modified dispersion liquid is injected into the viscose spinning liquid, and the rare earth modified dispersion liquid is used for the chitosan molecules in the modified dispersion liquid. C on the pyranose ring 6 ‑NH at location 2 The viscose spinning solution contains a large amount of ‑OH, the interaction between the two can be better mixed, the mixing efficiency is improved by at least 10 times, and the viscose system is also more stable; adding a small amount of carboxymethyl chitosan , to increase the compatibility of viscose and chitosan, so that the rare earth is distributed more evenly in the viscose.

Description

technical field [0001] The invention belongs to the field of preparation of regenerated cellulose fibers, in particular to a preparation method of rare earth modified regenerated cellulose fibers. Background technique [0002] Rare earths refer to the lanthanides of group IIIB in the periodic table and scandium and yttrium which are chemically similar to lanthanides. Rare earth elements specifically include scandium Sc, yttrium Y and lanthanum La, cerium Ce, praseodymium Pr, neodymium Nd, promethium Pm, samarium Sm, europium Eu, gadolinium Gd, terbium Tb, dysprosium Dy, holmium Ho, erbium Er, Thulium Tm, Ytterbium Yb, Lutetium Lu, a total of 17 elements. The term "rare earth" was used in the 18th century, because the minerals used to extract these elements were relatively rare at that time, and the obtained oxides were difficult to melt, dissolve in water, and difficult to separate, and their appearance resembled " Soil", hence the name rare earth. Rare earth elements are...

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Problems solved by technology

[0007] The above two patents are beneficial breakthroughs and attempts to use rare earth materials to modify and apply petroleum-based synthetic fibers to make composite functional synthetic fibers, but these products have the disadvantages of non-degradability and environmental pollution.

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