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Preparation method of cellulose fibres

A cellulose fiber and cellulose technology, applied in the field of cellulose fiber preparation, can solve the problems of low spinning process efficiency, lack of spinning solution, difficult industrial production, etc., to achieve easy recycling, reduce production costs, and produce The effect of process shortening

Inactive Publication Date: 2011-08-17
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the cellulose concentration that this method makes is not more than 30%, and efficiency is low
For another example, CN1851063A reports a method for preparing cellulose fibers with ionic liquid as a solvent, but the cellulose dissolving method in CN1491974A is also adopted in this method, so that the dissolving time is too long, thereby making the whole spinning process inefficient
In summary, the currently used cellulose processing methods mainly have disadvantages such as long dissolving time and poor continuity. More importantly, spinning solutions with high cellulose mass fractions (such as greater than 30%) cannot be obtained, which is difficult to use. in actual industrial production

Method used

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Examples

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Effect test

preparation example Construction

[0013] The preparation method (abbreviation preparation method) of the cellulose fiber designed by the present invention, this preparation method adopts melt spinning method and is plasticizer with ionic liquid, comprises the following steps:

[0014] 1. First crush the cellulose into fine particles or powder. The cellulose is selected from wood pulp, cotton pulp or bamboo pulp with a polymerization degree of 400-1000. Of course, two or more kinds of wood pulp, cotton pulp or bamboo pulp are also included. The mixture; the finer the pulverized cellulose particles or powder, the better;

[0015] 2. Mix and stir the pulverized cellulose and plasticizer evenly in the mixer, then feed it into the twin-screw extruder, where it is continuously melted, plasticized, and defoamed to make a uniform and stable spinning melt The mass ratio of the cellulose to the plasticizer is 3-6:7-4; the plasticizer is an imidazole-type ionic liquid, or is composed of an imidazole-type ionic liquid and...

Embodiment 1

[0022] The pulverized wood pulp 300g with a degree of polymerization of 722 and 700g of 1-allyl-3 methylimidazolium chloride salt ([AMIM]Cl) ionic liquid are stirred evenly in a mixer, and then fed into the mixture with an aspect ratio of 20 Advanced twin-screw extruder to make a uniform and stable spinning melt. The extruder feeding section, melting section, metering section and head temperature are 80°C, 100°C, 130°C and 140°C respectively, and the speed is 10 rpm / min, open the vacuum exhaust system after the material is discharged, spin through the metering pump and spinneret, the spinning speed is 10m / min, the spinning air gap is 10cm, the extraction liquid is water, the temperature is 20°C, the temperature of the drawing bath is 50°C, stretching ratio 0.2 times, after conventional processes such as washing, bleaching, oiling and drying, the melt-spun cellulose fiber can be obtained. After testing, the tensile strength of the fiber is 3.87cN / dtex.

Embodiment 2

[0024] [AMIM]Cl and 200g of cotton pulp 400g, 400g of pulverized degree of polymerization, N-allyl morpholine chloride salt ([AMMro]Cl) are mixed homogeneously in mixer, then Feed into a twin-screw extruder with an aspect ratio of 20 to make a uniform and stable spinning melt. The temperature of the feeding section of the extruder is set to 100°C, and the temperatures of the melting section, the metering section and the head are respectively 120°C and 140°C. °C and 140 °C, the rotating speed is 10 rpm, the vacuum exhaust system is turned on after the material is discharged, and it is spun through the metering pump and the spinneret, the spinning speed is 20m / min, the spinning air gap is 5cm, and the extract is 20%[ AMIM] Cl ionic liquid aqueous solution, the temperature of the extract is 20°C, the temperature of the stretching bath is 50°C, the stretching ratio is 2 times, and the cellulose fibers are obtained through conventional processes such as washing, bleaching, oiling an...

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Abstract

The invention discloses a preparation method of cellulose fibres, which comprises the following steps: 1, smashing cellulose into fine particles, wherein the cellulose is selected from wood pulp, cotton pulp or bamboo pulp with polymerization degree of 400-1,000; 2, uniformly mixing the cellulose particles with a plasticizer, and then feeding the mixture into a double-screw extruder, and preparing a spinning melt, wherein the mass ratio of the cellulose to the plasticizer is 3-6:7-4, the plasticizer is imidazole-based ionic liquid, or the mixed liquid of imidazole-based ionic liquid and morpholine-based ionic liquid, and the mixed liquid contains the same anions; 3, melting spinning, wherein the spinning speed is 5-100m / min, extract liquid is ionic liquid water solution with the mass of 0 to 20%, the temperature is 20- 90 DEG C, the stretch ratio is 0.2 to 5 times, the stretch bath temperature is 40-90 DEG C, and the spinning air gap is 5-20cm; and 4, washing, bleaching, oiling and drying spinning fibres to obtain the cellulose fibres.

Description

technical field [0001] The invention relates to fiber preparation technology, in particular to a preparation method of cellulose fiber. The preparation method adopts melt spinning, and ionic liquid is used as plasticizer. Background technique [0002] Cellulose is the most abundant natural polymer substance bestowed by nature on human beings. It is not only rich in sources, but also a renewable resource. Processing and utilization of cellulosic materials is of positive significance to the world's circular economy and sustainable development. Since unmodified cellulose cannot be melted, solution processing has been the main means for preparing regenerated cellulose fiber materials. At present, the production of cellulose fiber is mainly viscose method. However, this method consumes a lot of energy and will generate a large amount of waste gas and waste water during production, which will cause serious pollution to the environment. [0003] Ionic liquids are ionic compoun...

Claims

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Application Information

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IPC IPC(8): D01F2/00D01F1/10D01D5/08
Inventor 程博闻宋俊陆飞梁义藏洪俊纪秀杰
Owner TIANJIN POLYTECHNIC UNIV
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