Cellulose carbamate filament yarn

Abstract

The invention discloses a cellulose carbamate filament yarn. The cellulose carbamate filament yarn is prepared by the following steps of esterifying and dissolving activated cellulose to obtain a cellulose carbamate solution, so as to replace a spinning solution prepared from cellulose xanthate; performing wet type spinning, so as to obtain the cellulose carbamate filament yarn. The prepared cellulose carbamate filament yarn has the characteristics that the dry break strength is more than or equal to 1.5cN / dtex, the wet break strength is 0.6 to 0.8cN / dtex, and the dry elongation at break is 18 to 22%; the cellulose carbamate filament yarn is a low-strength and high-tension type regenerated cellulose fiber; the product property is good, residue is avoided, and the cellulose carbamate filament yarn can be applied to civil industries of clothes fabrics, nonwoven cloth, sanitary products and the like.

Description

technical field [0001] The invention relates to a cellulose carbamate fiber filament, in particular to a regenerated cellulose fiber filament obtained by synthesizing, dissolving and spinning cellulose carbamate in the process of industrialized production, belonging to cellulose The technical field of production of urethane fibers. Background technique [0002] In the textile industry, viscose fiber is one of the first fibers to be industrially produced, and has developed rapidly due to its good performance and low cost. In the traditional viscose production process, a certain amount of pulp raw material reacts with lye to form alkali cellulose, which is then combined with CS 2 Reaction synthesis of cellulose xanthate, preparation of viscose through the steps of dissolving, mixing, filtering, defoaming and aging, and then spinning, post-processing, post-processing and other processes to obtain viscose filaments, involving cellulose yellow Synthesis, dissolution and spinnin...

AI Technical Summary

Problems solved by technology

In the industrial production process of viscose fiber, we know that the process improvement of a single link cannot measure the practical value of its industrialization. Taking the above-mentioned synthesis technology of cellulose carbamate as an example, the existing public documents only record The synthetic route of cellulose carbamate, but in actual industrial production, in the process from cellulose carbamate to obtain regenerated cellulose fiber, there are still such as: dissolving, defoaming, spinning, drying, post-processing Therefore, even if cellulose carbamate is prepared by the above synthetic route, it does not represent a complete solution to the energy-saving and environmental protection problems of industrialized production of regenerated cellulose fibers. The following situations may also occur: 1. Cellulose The detection index of the regenerated cellulose fiber obtained after the spinning solution prepared by carbamate is difficult to meet the requirements of downstream products; second, the performance of regenerated cellulose fiber prepared by cellulose carbamate is quite different , it does not adapt to the existing spinneret or drafting equipment in the spinning process, it needs to re-invest in new equipment, and the production cost increases, etc.

[0004] Patent document CN102691125A (a method for preparing regenerated cellulose fiber from cellulose carbamate, 2012.09.26) records that cellulose carbamate is dissolved, frozen, thawed, filtered, defoamed, spun, coagulated , washing and drying to obtain regenerated cellulose fibers. The dry breaking strength of the regenerated cellulose fibers prepared according to this method is 1.44-2.86 cN / dtex, the wet breaking strength is 0.46-0.60 cN / dtex, and the dry breaking elongation It can be seen from the above data that the preparation method faces the following problems: 1. The regenerated cellulose fiber prepared from the above-mentioned regenerated cellulose fiber cannot fully meet the requirements of clothing fabrics, non-woven fabrics and sanitary products. Requirements for downstream products: dry breaking strength ≥ 1.5cN / dtex, wet breaking strength ≥ 0.6cN / dtex, dry breaking elongation 18%; Second, the regenerated cellulose fibers prepared by this method belong to low-strength and low-elongation type, the strength And elongation is low, spinning is more difficult, in the actual spinning process, the filament bundle that can not be extruded through the existing spinneret, therefore, does not have industrial practical value

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