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Spinning process for small molecular liquid crystal modified cellulose fibers

A cellulose fiber and spinning process technology, applied in the field of spinning process of small molecule liquid crystal modified cellulose fiber, can solve the problem of high viscosity of high-concentration cellulose spinning solution, unfavorable filtration, defoaming, spinning and drafting and other problems to achieve the effect of improving flow performance, improving stability and expanding application

Inactive Publication Date: 2017-01-04
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved by the present invention is that the viscosity of the high-concentration cellulose spinning solution is relatively high, which is not conducive to various processes such as filtration, defoaming, spinning and drawing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A spinning process of small molecule liquid crystal modified cellulose fiber:

[0025] (1) Vacuum drying the cellulose with a degree of polymerization of 350; the vacuum drying temperature is 50°C, the vacuum drying time is 36 hours, and the vacuum degree of vacuum drying is 90 Pa;

[0026] (2) Prepare 20% [EMIM]Ac / 80% DMSO ion composite solvent, add 25wt% cellulose and 0.25wt% acrylate, dissolve at 40℃ for 1h to obtain cellulose spinning solution, after filtering and deaeration Eject from a spinneret with a length-to-diameter ratio of 20:1, enter a coagulation bath with a temperature of 20°C after passing through an air gap of 5 cm, and a coagulation bath concentration of 20% to obtain a spun silk;

[0027] (3) The spun yarn is heated and stretched in a water bath. The first-stage drafting temperature of the heating stretching is 50°C, the drafting ratio is 1.1 times, the second-stage drafting temperature is 70°C, the drafting ratio is 1.5 times, and the third-stage drafting ...

Embodiment 2

[0029] A spinning process of small molecule liquid crystal modified cellulose fiber:

[0030] (1) Vacuum drying the cellulose with a degree of polymerization of 450; the vacuum drying temperature is 90°C, the vacuum drying time is 12 hours, and the vacuum degree of vacuum drying is 130 Pa;

[0031] (2) Prepare 30%[AMIM]C1 / 70%DMAc ion composite solvent, add 30wt% cellulose and 0.6wt% stearic acid, dissolve it at 80℃ for 0.5h to obtain cellulose spinning solution, after filtering and removing After soaking, it is ejected from a spinneret with a length-to-diameter ratio of 30:1, and enters a coagulation bath with a temperature of 25°C after passing through a 7cm air gap, and the coagulation bath concentration is 25% to obtain a spun silk;

[0032] (3) The spun yarn is heated and stretched in a water bath. The first-stage drafting temperature of the heated stretch is 55°C, the drafting ratio is 1.2 times, the second-stage drafting temperature is 75°C, the drafting ratio is 1.8 times, and...

Embodiment 3

[0034] A spinning process of small molecule liquid crystal modified cellulose fiber:

[0035] (1) Vacuum drying the cellulose with a degree of polymerization of 550; the vacuum drying temperature is 55°C, the vacuum drying time is 25h, and the vacuum degree of vacuum drying is 125Pa;

[0036] (2) Prepare 35%[BMIM]Cl / 65%NMP ion composite solvent, add 35wt% cellulose and 2.1wt% 4-methoxy-4'-benzyloxyazobenzene, and dissolve at 100℃ for 2h The cellulose spinning solution is obtained, filtered and defoamed, and ejected from a spinneret with a length-to-diameter ratio of 26:1. After passing through a 10cm air gap, it enters a coagulation bath with a temperature of 30°C, and the coagulation bath concentration is 30% , Get the nascent silk;

[0037] (3) The spun yarn is heated and stretched in a water bath. The first-stage drafting temperature of the heating stretching is 60°C, the drafting ratio is 1.5 times, the second-stage drafting temperature is 80°C, the drafting ratio is 2 times, an...

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Abstract

The invention discloses a spinning process for small molecular liquid crystal modified cellulose fibers. The spinning process is characterized by comprising the steps of preparing a spinning solution having the solid content of 25-40% from cellulose serving as a raw material, an ionic compound system serving as a cellulose solvent and small molecular liquid crystal serving as a rheological agent, filtering and de-aerating the spinning solution, then spraying the spinning solution out from a spinneret plate having a high length-diameter ratio to obtain as-spun fibers in a coagulation bath, then heating and stretching the as-spun fibers in a three-stage water bath, and finally performing heat setting and winding to form cellulose fibers. By adopting the small molecular liquid crystal as a rheological agent, cellulose molecule segments are subjected to in-situ disentanglement, destroyed entanglement regeneration and fixed disentanglement states, and the processed cellulose molecule segments are matched with the spinneret having a high length-diameter ratio to provide a new method for small molecular liquid crystal modified cellulose fibers; by adopting the method, cellulose fibers which are easy to process, efficient and environment-friendly can be obtained, and the development of novel cellulose fibers, which is low in energy consumption, and is economical and environmentally friendly, can be promoted.

Description

Technical field [0001] The invention belongs to the technical field of biomass fibers, and specifically relates to a spinning process of small-molecule liquid crystal modified cellulose fibers. Background technique [0002] Cellulose fiber has the advantages of good moisture absorption, strong air permeability, good dyeability, and biodegradability. It is the best raw material to replace traditional petroleum-based fibers. It can be widely used in non-woven fabrics, industrial fabrics, clothing, home textiles, and papermaking. Industry and medical fields. However, because cellulose has three hydroxyl groups on each glucose unit ring, the cellulose has a unique strong hydrogen bond structure and high crystallinity, making it unable to be directly melt-spun. At present, most industries use cellulose to produce viscose fiber by solution spinning, which has a long production process, high energy consumption, and serious pollution to the environment. Therefore, the development of en...

Claims

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Application Information

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IPC IPC(8): D01F2/24D01F1/10D01D1/02D01D4/02D01D5/06D01D5/14D01D10/02
CPCD01F2/24D01D1/02D01D4/02D01D5/06D01D5/14D01D10/02D01F1/10
Inventor 张玥邓雅郎玉玺余木火
Owner DONGHUA UNIV
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