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Method for manufacturing cellulose/ion liquid spinning liquid with double-screw extrusion machine

A twin-screw extruder and twin-screw extrusion technology, which is applied in the field of cellulose solution preparation, can solve the problems of low dissolution efficiency, complicated operation, disadvantages, etc., and achieve uniform spinning solution, good mechanical properties, and simple equipment Effect

Inactive Publication Date: 2008-07-16
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the above-mentioned patents, most methods such as ordinary heating, pressurization or microwave radiation are used to dissolve cellulose, but some of these methods are complicated to operate, and some are intermittent methods, and the dissolution efficiency is low, which is not conducive to the implementation of industrialization

Method used

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  • Method for manufacturing cellulose/ion liquid spinning liquid with double-screw extrusion machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The cellulose cotton pulp and the ionic liquid [BMIM]Cl (1-butyl-3-methyl-imidazolium chloride) were uniformly mixed in a weight ratio of 10:90 to form a light yellow paste, and then the formed The paste is continuously fed into a twin-screw extruder with 2 vacuum ports, a screw length-to-diameter ratio of 48:1, and a temperature of 100°C. The vacuum degree is -0.10MPa, and the screw speed is 20r / min. The pressure strength of the extruder head (that is, the outlet) is controlled at 1MPa. After 40 minutes of strong stirring, dissolution and vacuum dehydration, a light brown, transparent and uniform spinning solution can be obtained, and its zero-shear viscosity can reach 5487Pa·s. The spinnability of the solution is good, and the cellulose fiber with a fineness of 2.22 dtex and a breaking strength of 4.09 cN / dtex can be obtained by dry-wet spinning.

Embodiment 2

[0024] Cellulose wood pulp was uniformly mixed with ionic liquid [EMIM]Ac (1-ethyl-3-methyl-imidazolium acetate) at a weight ratio of 8:92 to form a light yellow paste, and then the formed The paste is continuously fed into a twin-screw machine with 2 vacuum ports, a screw length-to-diameter ratio of 48:1, and a temperature of 50°C. The vacuum degree is -0.06MPa, and the screw speed is 50r / min. The pressure strength of the machine head (that is, the outlet) is controlled at 4MPa. After 15 minutes of strong stirring, dissolution and vacuum dehydration, a light brown transparent and uniform spinning stock solution can be obtained, and its zero-shear viscosity can reach 4525Pa·s. The spinnability is good, and the cellulose fiber with a fineness of 2.43 dtex and a breaking strength of 3.68 cN / dtex can be obtained by dry-wet spinning.

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Abstract

The invention relates to a method for using a double screw extruder to prepare celluloses / ionic liquids spinning solution and the preparation comprises that the celluloses are uniformly mixed with the ionic liquids according to the weight ratio of 5:95 to 25:75, and then the mixture is put into the double screw extruder which has two vacuum orifices and the screw length diameter ratio of which is 36:1 to 60:1, the control range of temperature is 40 to 120 DEG C, and the light brown and transparent celluloses / ionic liquids spinning solution is formed after strongly mixing and dissolving for 8 to 40 minutes and vacuum dehydration; the obtained celluloses / ionic liquids spinning solution is supercharged by a booster pump and sprayed from a spinneret after coming into a metering pump by a pre-filter, and then cellulose fibers are formed by a plurality of steps such as solidification, washing, cutting and drying, etc. The invention not only shortens the dissolution time of the celluloses but also leads to the more fully mixing and dissolving of materials, and achieves the purposes of energy-saving, high efficiency, decreasing degradation and improving the quality of spinning original solution, so the industrialization becomes easier.

Description

technical field [0001] The invention belongs to the field of preparation of cellulose solution, in particular to a method for preparing cellulose / ionic liquid spinning liquid with a twin-screw extruder. Background technique [0002] Cellulose is the most abundant renewable and naturally degradable natural polymer resource on earth, and it is widely used in industrial fields such as fiber, papermaking, film, coating and so on. It is estimated that nature can produce hundreds of billion tons of cellulose every year through photosynthesis, but only about six billion tons of cellulose are used by people. Therefore, with the increasing depletion of non-renewable resources such as oil and natural gas and the increasing emphasis on environmental pollution in various countries, the development and application of cellulose materials has become one of the hotspots in research all over the world. However, due to the complex structure of cellulose with the coexistence of crystalline re...

Claims

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Application Information

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IPC IPC(8): D01D1/02D01F2/02
Inventor 张慧慧邵惠丽孙玉山蔡涛赵庆章杨革生胡学超
Owner DONGHUA UNIV
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