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Method for continuously preparing regenerated cellulose fibre

A technology of regenerated cellulose and cellulose, applied in fiber processing, fiber chemical characteristics, sustainable manufacturing/processing, etc., can solve the problems of low cellulose concentration, high melting point and viscosity, low production efficiency, etc., and achieve the spinning process. The effect of mild conditions, wide process range and high production efficiency

Inactive Publication Date: 2008-12-24
INST OF CHEM CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the melting point and viscosity of 1,3-dialkylimidazolium halogen salt ionic liquid are very high, and its melting point is around 100°C, which requires higher temperature and lower cellulose concentration in the preparation process, and the production cost high, low productivity

Method used

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  • Method for continuously preparing regenerated cellulose fibre
  • Method for continuously preparing regenerated cellulose fibre
  • Method for continuously preparing regenerated cellulose fibre

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～17

[0054] Using microcrystalline cellulose, wood pulp, and absorbent cotton as three raw materials, a cellulose / AMIMCl solution with an average molecular weight of 300-800 and a concentration of 8-18% was prepared, and it was filtered and defoamed under various conditions. For dry jet wet spinning, the coagulation bath is AMIMCl aqueous solution with a concentration of 0-20% (weight). The as-spun fibers were washed with deionized water six times, and dried at 80-150°C. The tensile properties of the product fibers were measured after being placed in a constant temperature room for 48 hours. Each sample was measured 10 times and the average value was taken. The specific spinning conditions, product fineness and tensile strength are shown in Table 3.

[0055] Experiments have proved that the cellulose / low-viscosity ionic liquid system is suitable for spinning by dry-jet wet spinning technology. It has the advantages of wide process range, mild temperature conditions, moderate press...

Embodiment 18～35

[0058] According to basically the same process as AMIMCl, other low-viscosity ionic liquids such as 1-ethyl-3-methylimidazolium acetate were used to carry out cellulose spinning experiments. Typical experimental data and results are listed in Table 4.

[0059] It can be seen from these examples that, like using AMIMCl as a cellulose solvent, using these low-viscosity ionic liquids can also spin regenerated cellulose fibers at a relatively low temperature, and the resulting fibers have good properties.

Embodiment 36～40

[0061] According to the substantially same process as in Examples 1-5, using 1-allyl-3-methylimidazolium chloride salt ionic liquid as a solvent, adding different contents of carbon nanotubes into the cellulose solution, the cellulose spinning experiment was carried out. Typical experimental data and results are listed in Table 5, among them, cellulose concentration: 8%, cellulose polymerization degree: 550, spinning temperature: 80 ℃, air gap length: 5cm, spinning pressure: 2MPa; Spinning speed : 40m / s, drawing speed: 160m / s, number of spinneret holes: 1, spinneret hole diameter: 0.1mm.

[0062] It can be seen from these examples that, like using AMIMCl as a cellulose solvent, adding carbon nanotubes to cellulose / ionic liquid can spin regenerated cellulose fibers with antistatic properties, and the obtained fibers have good mechanical properties.

[0063] The embodiment of the cellulose / AMIMCl solution dry jet wet spinning that table 5 contains carbon nanotubes

[0064] ...

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Abstract

The invention discloses a method for continuously preparing regenerated cellulose fibers through the solvent method, comprising the following steps that: a cellulose raw material is dissolved into an ion liquid to prepare a spinning liquid; gel type regenerated cellulose fibers are obtained through spinning; and the regenerated cellulose fibers are obtained through cleaning, rear draft and drying, wherein, the ion liquid is selected from one or a plurality among the following ion liquids: a). an ion liquid with 1, 3-dialkyl imidazole as a cation and formiate radical, radical vinegar or propionate radical as an anion; and b). an ion liquid with 1-R1-3-R2- dialkyl imidazole as the cation and chlorine, bromine, iodine, formiate radical, radical vinegar, sulfate radical, nitrate radical, tetrafluoroborate radical, thiocyanate radical, hexafluorophosphate radical, p-toluenesulfonate radical or trifluoromethanesulfonic acid radical as the anion. The method has the advantages of wide technological range, mild temperature condition, adequate pressure, quick spinning speed and so on, can prepare the regenerated cellulose fibers with superior performance and complete specifications, and has low production cost, high production efficiency and wide application prospect.

Description

technical field [0001] The invention relates to a method for continuously preparing regenerated cellulose fibers by a solvent method, in particular to a method for continuously preparing regenerated cellulose fibers with a low-viscosity ionic liquid as a solvent. Background technique [0002] With the increase of industrial production capacity, mineral resources such as oil are increasingly difficult to meet the future needs of human beings, so renewable natural resources are becoming more and more important. Cellulose is the most abundant natural polymer on the earth, and making full use of cellulose resources is of great significance to the sustainable development of human beings. [0003] At present, in the field of chemical fiber manufacturing, the main way to use cellulose is the so-called viscose process, that is, to prepare cellulose into alkali cellulose, and chemically react with carbon disulfide after aging to generate cellulose xanthate, cellulose xanthogen The a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F2/08D01F13/02D06M13/352D06M13/268D06M13/402
CPCY02P70/62
Inventor 武进王三元张军王东兴魏广信何嘉松
Owner INST OF CHEM CHINESE ACAD OF SCI
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