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Solvent for solving cellulose and its application

A technology for dissolving cellulose and cellulose, applied in the fields of natural polymers, environmental engineering, agriculture, and chemistry, it can solve problems such as difficulty in realizing industrialization, and achieve the effects of wide conditions, short production cycle, and low consumption of raw materials.

Inactive Publication Date: 2004-11-10
WUHAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this solvent system must be 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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Get steamed wood pulp cellulose (viscosity average molecular weight M η =4.5×10 4 ) 9 grams, add 200 grams of 9.5wt% NaOH / 4.5wt% thiourea mixed aqueous solution, fully stir in ice water bath (0-5 ℃) for 5 minutes, obtain transparent cellulose solution, use 200 under the pressure of 0.1~0.2MPa Filter through a mesh strainer to obtain a clear solution.

Embodiment 2

[0018] Get non-woven fabric (viscosity average molecular weight M η =12.0×10 4 ) 10 grams, adding 200 grams of 9.5wt% NaOH / 4.5wt% thiourea mixed aqueous solution whose precooling temperature is -5°C, fully stirred, dissolved within 10 minutes, and filtered with a 200-mesh filter under 1 to 2 atmospheric pressures, A clear solution was obtained.

Embodiment 3

[0020] Take 15 grams of regenerated cellulose (viscose staple fiber), add 185 grams of 8wt% NaOH / 4wt% thiourea mixed aqueous solution, and stir at 5° C. for 5 minutes to obtain a transparent cellulose solution. Centrifuge at 8,000 rpm at 15°C for 30 minutes with an ultracentrifuge, and the cellulose solution remains unchanged from before centrifugation. Pour out the cellulose solution, no micelle precipitates at the bottom of the centrifuge cylinder, and no visible fibers exist in the obtained solution. Regenerated cellulose (viscose staple fiber) dissolves completely. Stable for one week at 7-10°C.

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Abstract

The invention relates to a dissolvent for quick-speed direct dissolution of cellulose which comprises sodium-hydroxide and the water solution of sulfourea, wherein sodium-hydroxide amounts to 8.1-12.0% of the total water solution weight in the dissolvent, and sulfourea amounts to 3.0-6.0A% of the total water solution weight. The invention also provides a process for quick-speed direct dissolution of cellulose.

Description

technical field [0001] The present invention relates to a kind of solvent that uses the mixed aqueous solution of sodium hydroxide and thiourea as the solvent of cellulose, and use it to dissolve cellulose and prepare the new method of regenerated cellulose fiber and film, belong to the field of natural macromolecule, also belong to chemistry, agriculture, field of environmental engineering. Background technique [0002] Plant cellulose is the most abundant renewable resource on the earth, and it is an environmentally friendly material. Making full use of cellulose can not only protect the environment, but also save limited petroleum resources. Because cellulose has strong intramolecular and intermolecular hydrogen bonds, it is difficult to dissolve and cannot be melted, which greatly limits its wide application. The traditional process of producing regenerated cellulose silk and film is still the viscose process, and its principle is that cellulose is combined with CS unde...

Claims

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Application Information

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IPC IPC(8): C08J3/03C08L1/02
Inventor 张俐娜阮东金惠明邓靖平周金平陈辉
Owner WUHAN UNIV
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