Method for improving strength of regenerated cellulose fiber

By introducing secondary stretching technology during spinning molding, the regenerated cellulose fibers can be effectively stretched, and the problem of low fracture strength of existing fibers is solved, which significantly improves the fracture strength and fracture work of the fibers, achieving higher practical application value.

CN119685949APending Publication Date: 2025-03-25SOUTHWEST JIAOTONG UNIV
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Patent Information

Application Number
CN202411908276.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-24
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

The fracture strength of existing regenerated cellulose fibers is not high, with a maximum of only 1.73cN/dtex, which limits its widespread use in practical applications.

Method used

By introducing secondary stretching during spinning molding, the viscous state spinning liquid is negatively stretched or not largely stretched by using a primary drafting roller to avoid breaking the wire, and then secondary stretching of the primary fibers is used by a second drafting roller to oriented the cellulose macromolecules and the associations in the tensile direction to improve the fiber strength.

Benefits of technology

The fracture strength and breaking work of regenerated cellulose fibers have been significantly improved, reaching 2.11cN/dtex and 110623.90cN·mm respectively, meeting higher practical application needs.

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Abstract

The invention relates to a method for improving the strength of regenerated cellulose fibers, and belongs to the field of regenerated cellulose fiber preparation. According to the method for improving the strength of the regenerated cellulose fiber, the regenerated cellulose fiber is prepared through the processes of cellulose pretreatment, spinning solution preparation, spinning, post-treatment and the like. In the spinning process, in order to avoid the problem that as nascent fibers which are just sprayed out of a spinning nozzle and are in a viscous flow state are broken, only negative stretching, non-stretching or small positive stretching can be adopted, and the fiber strength is not high; effective secondary drafting is carried out on nascent fibers which are not completely regenerated and still in a large plastic state, so that cellulose macromolecules and associates are highly oriented in the stretching direction, and the fiber strength is effectively improved; the first-stage draw ratio is 0.769 to 2.308, and the second-stage draw ratio is 1.0 to 1.4. The strength of the regenerated cellulose fiber is improved by utilizing the interaction response of the first-stage drafting and the second-stage drafting; the breaking strength of the regenerated cellulose fiber is 2.11 cN / dtex, and the breaking work of the regenerated cellulose fiber is 110623.90 cN * mm.
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