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Method for dissolving cellulose

A technology for dissolving cellulose and cellulose, which is applied in the field of natural polymers, can solve the problems of complicated cellulose dissolution process, weak cellulose ability, and difficult solution recovery, etc., and achieves easy recycling, mild temperature range, and wide application foreground effect

Inactive Publication Date: 2009-12-23
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the disadvantages of the prior art, such as complicated cellulose dissolving process, high cost and pollution, weak ability to dissolve cellulose with higher molecular weight, difficulty in solution recovery, harsh conditions, etc., the present invention provides a cellulose dissolving process method, this method can not only dissolve higher molecular cellulose simply, quickly, and under mild conditions, but also has low cost, no pollution to the environment, and is easy to recycle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Take regenerated cellulose (non-woven fabric M η =15×10 4 ) 10 grams, add 100 grams of 16wt% NaOH aqueous solution, stir for 5 minutes, then pre-cool in the refrigerator to 2 ° C, take out the fully stirred alkali cellulose solution, add 90 grams of 0 ° C 9wt% thiourea aqueous solution, After stirring uniformly at room temperature (25° C.) for 5 minutes, a transparent cellulose solution was obtained. The total time for dissolving the cellulose is 10 minutes, and the cellulose content in the prepared cellulose solution is 5 wt%, the NaOH content is 8 wt%, and the thiourea content is about 4 wt%.

Embodiment 2

[0015] 100 grams of 14wt% NaOH aqueous solution are precooled to 0 ℃ in refrigerator, get cotton linter pulp immediately (viscosity-average molecular weight M η =6×10 4 ) 16 grams into it, fully stirred (4 minutes) to generate alkali cellulose solution, then quickly added 84 grams of 8wt% thiourea aqueous solution at 5 ° C, and stirred at room temperature (25 ° C) after (5 minutes) to obtain a transparent of cellulose solution. The total time for dissolving was 9 minutes, and the cellulose content in the prepared cellulose solution was 8 wt%, the NaOH content was 7 wt%, and the thiourea content was about 3.4 wt%.

Embodiment 3

[0017] 90 grams of 18wt% NaOH aqueous solution is pre-cooled to 2 ℃ in the refrigerator, and immediately gets the cotton linter pulp (viscosity-average molecular weight M η =8×10 4 ) 10 grams into it, fully stirred (4 minutes) to generate an alkali cellulose solution, then quickly added 100 grams of 5 ° C 1wt% thiourea aqueous solution, stirred at room temperature (25 ° C) after (5 minutes) to obtain a transparent of cellulose solution. The total time for dissolving was 9 minutes, and the cellulose content in the prepared cellulose solution was 5 wt%, the NaOH content was about 8 wt%, and the thiourea content was 0.5 wt%.

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PUM

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Abstract

A method for dissolving cellulose is carried out by dispersing cellulose in NaOH solution 12-24 wt%, pre-cooling to -2-10 deg. C, agitating to obtain alkaline cellulose solution, or pre-cooling NaOH solution 12-24 wt% to -2-10 deg. C, adding into cellulose, agitating to obtain alkaline cellulose solution, adding thiurea solution 1-10 wt% into alkaline cellulose solution and agitating at room temperature. The cellulose solution consists of cellulose 2-9 wt%, NaOH 4.8-14.4 wt% and thiurea 0.4-6 wt%. It's cheap and simple, has recovery and circulation utilization for effluent and no environmental pollution. It can be used for natural cellulose or reclaimed cellulose with molecular weight less than 15X104.

Description

technical field [0001] The invention relates to a method for dissolving cellulose, belonging to the field of natural polymers. Background technique [0002] With the depletion of non-renewable resources such as petroleum, cellulose, as the most abundant renewable resource on earth, will become an important chemical raw material in the future. However, at present, cellulose in the chemical industry is far from being fully utilized, mainly because the cellulose dissolution process in the existing process is complicated, costly and polluting. For example, a large amount of CS is produced in the production process of rayon and cellophane by viscose method 2 And seriously pollute environment; Produce copper ammonia rayon with cuproammonia method and also have environmental pollution, expensive price and solution recovery problem; 2 Aqueous solution (U.S.Patent5290349, 1994), LiCl / DMAc (U.S.Patent 4302252, 1981), etc. are difficult to industrialize due to the complicated dissolu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/03C08L1/02
Inventor 张俐娜祁海松吕昂
Owner WUHAN UNIV