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

AI Technical Summary

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 th

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0013] The preparation method of cellulose fiber (referred to as preparation method) designed in the present invention, which adopts a melt spinning method and uses an ionic liquid as a plasticizer, includes the following steps:

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

[0015] 2. After mixing the pulverized cellulose and plasticizer evenly in a mixer, they are fed into the twin-screw extruder, where they are continuously melted, plasticized and defoamed to form 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 containing the same anion and a ...

Example Embodiment

[0021] Example 1

[0022] Mix 300g of the pulverized wood pulp with a degree of polymerization of 722 and 700g of 1-allyl-3 methylimidazole chloride ([AMIM]Cl) ionic liquid in a mixer, and then feed them with an aspect ratio of 20 The twin-screw extruder is made into uniform and stable spinning melt. The temperature of the feeding section, melting section, metering section and die head of the extruder are respectively 80℃, 100℃, 130℃ and 140℃, and the speed is 10 revolutions. / Min. After discharging, turn on the vacuum exhaust system and 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, and the drawing bath temperature At 50°C, the stretching ratio is 0.2 times. After washing, bleaching, oiling and drying, the melt-spun cellulose fiber is obtained. After testing, the tensile strength of the fiber is 3.87 cN / dtex.

Example Embodiment

[0023] Example 2

[0024] Mix 400g of the pulverized cotton pulp with a degree of polymerization of 800, 400g of [AMIM]Cl, and 200g of N-methyl, N-allylmorpholine chloride ([AMMro]Cl) in a mixer. Feed into a twin-screw extruder with a length-to-diameter ratio of 20 to make a uniform and stable spinning melt. The temperature of the feeding section of the extruder is set to 100℃, and the temperature of the melting section, metering section and die head are 120℃ and 140 respectively. ℃ and 140℃, the speed is 10 rpm, the vacuum exhaust system is turned on after discharging, the spinning is through the metering pump and the spinneret, the spinning speed is 20m / min, the spinning air gap is 5cm, and the extraction liquid is 20% [ AMIM]Cl ionic liquid aqueous solution, the extract temperature is 20°C, the stretching bath temperature is 50°C, the stretching ratio is 2 times, and the cellulose fiber is obtained after washing, bleaching, oiling, and drying. After testing, the tensile stren...

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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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