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Cellosolve and its use

A cellulose solvent and regenerated cellulose technology, which is applied in the fields of chemistry and materials science, can solve the problems of difficulty in dissolving cellulose and inability to obtain a high molecular weight cellulose concentrated solution, etc., and achieves a short production cycle, a wide range of uses, and good fiber spinnability. sexual effect

Inactive Publication Date: 2004-12-29
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this system is that it is difficult to dissolve higher molecular weight cellulose, so that high molecular weight cellulose concentrated solution cannot be obtained

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 200 grams of 3.0wt% LiOH / 6.0wt% thiourea mixed aqueous solution was added to 20 grams of regenerated cellulose (viscose staple fiber, polymerization degree 300) and stirred, then placed in a refrigerator (about -20° C.) for 3 to 5 hours. It was then thawed at room temperature, and a transparent cellulose solution was obtained after stirring. Use an ultracentrifuge at 10,000 rpm at 15°C for 30 minutes to remove air bubbles, and there will be no micelles at the bottom of the centrifuge cylinder.

Embodiment 2

[0015] 200 grams of 7.0wt% LiOH / 3.0wt% thiourea mixed aqueous solution was added to 8.4 grams of wood pulp cellulose (polymerization degree 460) and stirred, then placed in a refrigerator (about -20° C.) to freeze for 3 to 5 hours. It was then thawed at room temperature, and a transparent cellulose solution was obtained after stirring. Use an ultracentrifuge at 10,000 rpm at 15°C for 30 minutes to remove air bubbles, and there will be no micelles at the bottom of the centrifuge cylinder.

Embodiment 3

[0017] 200 grams of 4.5wt% LiOH / 5.0wt% thiourea mixed aqueous solution was added, then 8.4 grams of cotton linter pulp (polymerization degree 800) was added, stirred and placed in a refrigerator (about -20°C) for 3 to 5 hours. It was then thawed at room temperature, and a transparent cellulose solution was obtained after stirring. Use an ultracentrifuge at 10,000 rpm at 15°C for 30 minutes to remove air bubbles, and there will be no micelles at the bottom of the centrifuge cylinder.

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PUM

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Abstract

The present invention is one new kind of cellulose solvent comprising lithium hydroxide 3.0-7.0 wt%, thiourea 3.0-6.0 wt% and water the rest. The said cellulose solvent may be used in dissolving natural cellulose and regenerated cellulose via mixing with cellulose, freezing and defreezing; or, it is first cooled to -10 deg.c to 0 deg.c and then maintained in -8 deg.c to 0 deg.c to dissolve natural cellulose and regenerated cellulose directly. The new cellulose solvent may be used to reach cellulose dissolvability as high as 100 % to prepare transparent dense cellulose solution. The dissolved natural cellulose may have molecular weight up to 200000. The new cellulose solvent may be used in preparing regenerated cellulose film, mixture film, cellulose / nano particle functional film and non-woven fabric, and may be also used as cellulose derivatizing reaction medium.

Description

technical field [0001] The present invention relates to a new solvent for dissolving cellulose and its application. The present invention belongs to the field of chemistry and material science. Background technique [0002] Due to the increasing environmental pollution caused by non-degradable plastic waste and the gradual depletion of petroleum resources in 50 years, the research and development of renewable plant resources has become increasingly attractive. Plant cellulose is the most abundant renewable resource on earth, and it is an environmentally friendly polymer material. Cellulose has attracted more and more attention due to its remarkable regeneration rate (100 billion tons / year), and is expected to become one of the main chemical raw materials in the 21st century. However, in the chemical industry, cellulose is far from being fully utilized, mainly because the cellulose dissolution process in the existing technology is complicated, costly and polluting (J.Macrom...

Claims

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Application Information

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IPC IPC(8): C08B1/00C08J3/09C08L1/02
Inventor 张俐娜蔡杰
Owner WUHAN UNIV
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