Preparation method for regenerated cellulose fiber

A technology of regenerated cellulose and cellulose dissolving, applied in the direction of single-component cellulose rayon, fiber chemical characteristics, wet spinning method, etc., can solve the problems such as difficult to realize industrialization, achieve less raw material consumption, short production cycle, Effect of High Crystallinity and Molecular Weight

Inactive Publication Date: 2005-03-16
WUHAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solvent system must be thawed for 3-5 hours under freezing conditions to dissolve cellulose to prepare a transparent cellulose concentrated solution, so it is difficult to realize industrialization

Method used

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  • Preparation method for regenerated cellulose fiber
  • Preparation method for regenerated cellulose fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 200g of 5wt% NaOH / 20wt% urea mixed aqueous solution was pre-cooled to -10°C, then immediately added 12g of viscose staple fiber (polymerization degree 250), stirred at room temperature for 2 minutes, and the cellulose was completely dissolved. Use an ultracentrifuge at 8,000 rpm at 15°C for 30 minutes to degas it to obtain a transparent cellulose solution. Spinning into 3wt%H by spinning machine spinneret (30 holes, diameter 0.10mm) 2 SO 4 Coagulate and regenerate in an aqueous solution, rinse with water after stretching and orientation, and dry to obtain regenerated cellulose fibers. The fiber is white, soft and shiny, with high strength.

Embodiment 2

[0014] 200g of 12wt% NaOH / 8wt% urea mixed aqueous solution was precooled to -4°C, then immediately added 6.4g of cotton linter cellulose pulp (polymerization degree 800), stirred at room temperature for 2 minutes, and the cellulose was completely dissolved. Use an ultracentrifuge at 8,000 rpm at 15°C for 30 minutes to degas it to obtain a transparent cellulose solution. Spinning into 25wt%H by spinning machine spinneret (30 holes, diameter 0.10mm) 2 SO 4 Coagulate and regenerate in an aqueous solution, rinse with water after stretching and orientation, and dry to obtain regenerated cellulose fibers. The fiber is white, soft and shiny, with high strength.

Embodiment 3

[0016] 200g of 12wt% NaOH / 8wt% urea mixed aqueous solution was pre-cooled to -8°C, then immediately added 8.4g of non-woven fabric (polymerization degree 600), stirred at room temperature for 2 minutes, and the cellulose was completely dissolved. Use an ultracentrifuge at 8,000 rpm at 15°C for 30 minutes to degas it to obtain a transparent cellulose solution. Spinning into 25wt%H by spinning machine spinneret (30 holes, diameter 0.10mm) 2 SO 4 / 5wt%Na 2 SO 4 Coagulate and regenerate in an aqueous solution, rinse with water after stretching and orientation, and dry to obtain regenerated cellulose fibers. The fiber is white, soft and shiny, with high strength.

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Abstract

The invention discloses a preparation method for regenerated cellulose fiber, comprising: dissolving the cellulose in 5-12 wt.% of sodium hydroxide and 8-20 wt.% of urea mixed water solution, agitating, producing dense cellulose solution, spinning on the spinning machine by wet spinning method and regenerating solidification in the coagulating bath, drawing, drying, getting the regenerated cellulose fiber. The method is simple, short-processed, unpolluted and cheap. The method is hopeful to replace the rayon and non-woven cloth produced by the adhesive method which is high-pollution.

Description

technical field [0001] The invention relates to a method for preparing a novel regenerated cellulose fiber, which belongs to the field of natural polymers, and also belongs to the fields of chemical engineering, agriculture, and environmental engineering. Background technique [0002] At present, cellulose is far from being fully utilized in the chemical industry, mainly because the cellulose dissolution process in the existing process is complicated, costly and polluting. For one hundred years, regenerated cellulose products still use the traditional viscose method to produce rayon and cellophane. Cellulose under the action of strong alkali (sodium hydroxide concentration 18%) and CS 2 The reaction produces cellulose xanthate, which dissolves in alkali solution and becomes viscose. Cellulose viscose is regenerated in dilute acid solution after spinning or casting to produce viscose fiber or cellophane. This method releases a large amount of toxic CS during the production...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/06D01F2/00
Inventor 蔡杰张俐娜周金平陈辉金惠明
Owner WUHAN UNIV
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