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Method for preparing cellulose fiber

A cellulose fiber and cellulose technology, applied in the field of cellulose fiber preparation, can solve problems such as unreported cellulose fibers, and achieve the effects of being conducive to environmental protection, high mechanical performance, and improving production efficiency

Inactive Publication Date: 2010-09-22
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Within the scope of the applicant's search, there is no report on the technology of using ionic liquids as plasticizers and adopting the melt spinning method to prepare cellulose fibers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0013] The preparation method (abbreviation method) of the cellulose fiber that the present invention designs, this method adopts melt spinning process, comprises the following steps:

[0014] (1) In a mixer, the cellulose and the ionic liquid solution are made into a homogeneous mixture at a mass ratio of 5 to 8: 5 to 2,

[0015] The cellulose is wood pulp, cotton pulp or bamboo pulp with a polymerization degree of 400 to 1000; in order to improve the mixing effect and efficiency, the cellulose is crushed into a size below 1 mm × 1 mm before mixing, and then mixed according to the stated ratio ;

[0016] The ionic liquid is composed of a cation and an anion, and the cation is an alkylimidazolium ion containing a substituent, wherein the substituent is hydrogen, C 1 ~C 6 One or more of alkyl, vinyl, propenyl, butenyl, hydroxyethyl, hydroxypropyl, and alkoxy; the anion is a halide ion, BF 4 - 、PF 4 - 、SCN - 、CN - , OCN - , CNO - 、CF 3 SO 3 - 、CFCOO - 、CH 3 COO -...

Embodiment 1

[0025] Stir 300g of wood pulp with a degree of polymerization of 530 and 300g of [AMIM]Cl ionic liquid crushed below 1mm×1mm into a homogeneous mixture in a mixer, and then feed it into a twin-screw extruder for melt spinning. The temperature of the feeding section is set to The temperature of the melting section, the metering section and the nozzle section are 110℃, 130℃ and 140℃ respectively, and the rotation speed is 10 rpm. After the material is discharged, the vacuum exhaust system is turned on. After the metering pump and the spinneret, the fiber The fine fibers flow through the hot air tunnel for dry heat stretching. The temperature of the hot air in the tunnel is 80°C, and the stretching ratio is 2 times. The stretched fibers enter the water bath for washing at a temperature of 50°C, and then carry out conventional heat setting and winding, that is Obtain the fiber described in the present invention. After testing, the tensile strength of the obtained cellulose fiber w...

Embodiment 2

[0027]Mix 300g of wood pulp with a degree of polymerization of 530 crushed to less than 1mm×1mm with 200g [AMIM]Cl and 25gDMSO in a mixer, and then feed it into a twin-screw extruder. The temperature of the feeding section is set to 110°C. The temperature of the melting section, the metering section and the head section are 130°C, 150°C and 160°C respectively, and the rotation speed is 20 rpm. After the material is discharged, the vacuum exhaust system is opened, and the cellulose flows through the metering pump and the spinneret. The hot air tunnel is used for dry heat stretching, wherein the temperature of the hot air in the tunnel is 140°C, and the stretching ratio is 0.5 times. After stretching, the fibers are washed in a water bath at a temperature of 80°C, and then heat-set and wound to obtain the fibers , and its tensile strength is 4.12cN / dtex.

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Abstract

The invention discloses a method for preparing cellulose fiber. By using melting spinning technology, the method comprises the following steps of: 1, mixing cellulose and ionic liquid in a mass ratio of 5-8:5-2 to obtain an uniform mixture, wherein the cellulose is wood pulp, cotton pulp or bamboo pulp with degree of polymerization of 400 to 1,000; the ionic liquid consists of cations and anions; the cations are substituent-containing alkyl imidazole ions, wherein the substituent is more than one of hydrogen, C1 to C6 alkyl group, ethyl, propenyl, butenyl, ethoxyl, hydroxypropyl and alkoxy groups; the anions are halogen ions, BF4-, PF4-, SCN-, CN-, OCN-, CNO-, CF3SO3-, CFCOO-, CH3COO-, and (CF3SO2)2N- or (CF3SO2)2Cl-; 2, feeding the mixture into a double-screw extruder for melting spinning and stretching the extruded yarn by 0.5 to 6 times; and 3, washing, performing thermal forming and winding to obtain the cellulose fiber.

Description

technical field [0001] The invention relates to a method for preparing cellulose fibers, in particular to a method for preparing cellulose fibers by using an ionic liquid as a plasticizer and adopting a melt spinning process. Background technique [0002] Cellulose is the most abundant natural polymer material bestowed by nature to 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 methods have been the main means to prepare regenerated cellulose materials. At present, the production of cellulose fiber is mainly based on the viscose method. However, this method consumes a lot of energy and produces a large amount of waste gas and waste water during production, causing serious pollution to the environment. [0003] In recent years, ionic liquids, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F2/02D01D5/084D01D5/098
Inventor 宋俊程博闻陆飞纪秀杰王薇藏洪俊
Owner TIANJIN POLYTECHNIC UNIV
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