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Solvent for dissolving cellulose and its preparation method and use

A technology for dissolving cellulose and cellulose solution, applied in the direction of artificial filaments in cellulose solution, can solve the problems of unsuitable industrial production, large solvent environment pollution, poor ability to dissolve cellulose, etc., and achieve good spinnability , Strong dissolving ability, the effect of prolonging time

Inactive Publication Date: 2005-11-23
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a solvent for dissolving cellulose and its preparation method and use, so as to solve the shortcomings of the prior art such as large environmental pollution, poor ability to dissolve cellulose, and unsuitability for industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] Get 5.8 grams of cotton pulp (polymerization degree DP=500), add in 100 grams of 8% sodium hydroxide / 6.5% thiourea / 8% urea mixed aqueous solution (solution is precooled to-4 ℃), then at-4 ℃ ( Stir vigorously for 10 minutes by controlling the temperature in a brine bath, and filter with a 200-mesh sieve under 1 atmosphere to obtain a clear cellulose solution. The solution can be stored at 10°C for 5 days without gelation, and it will defoam naturally during the standing process.

example 2

[0028] Get 12 grams of cotton pulp (polymerization degree DP=300), add in 100 grams of 9% sodium hydroxide / 5.5% thiourea / 6% urea mixed aqueous solution (solution is precooled to-4 ℃), then at-4 ℃ ( The temperature was controlled by a salt water bath) and stirred vigorously for 5 minutes, and filtered with a 200-mesh sieve under 1 atmospheric pressure to obtain a clear cellulose solution.

example 3

[0030] Get 4 grams of cotton pulp (polymerization degree DP=1400), add in 100 grams of 9% sodium hydroxide / 5.5% thiourea / 8% urea mixed aqueous solution (solution is precooled to-2 ℃), then at-2 ℃ ( Stir vigorously for 8 minutes by controlling the temperature in a brine bath, and filter with a 200-mesh sieve under 1 atmospheric pressure to obtain a clear cellulose solution.

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Abstract

The invention discloses a solvent for dissolving cellulose which comprises sodium hydroxide, thiocarbamide, urea and water as quaternary system. The solvent has the strongest dissolving capacity at the temperature of -12 to 5 deg. C. The invention also provides the process for rapidly dissolving cellulose by employing the solvent, and the method for preparing cellulose fiber or cellulose film. The solvent system has strong dissolving capacity to cellulose.

Description

technical field [0001] The invention relates to a solvent for dissolving cellulose and its preparation method and use, in particular to a solvent containing sodium hydroxide, thiourea and urea, its preparation method and its application in the preparation of cellulose fibers and films. technical background [0002] Cellulose is a natural renewable resource, rich in sources, biodegradable, and has good biocompatibility. Therefore, using cellulose as a raw material can not only reduce oil consumption, but also protect the environment. Because the cellulose molecule contains a large number of hydroxyl groups, it can form strong intramolecular and intermolecular hydrogen bonds, has high crystallinity, and the rigidity of the molecular chain is relatively strong, so it is difficult to dissolve with general solvents; on the other hand, due to The decomposition temperature of cellulose is higher than its melting temperature, making it difficult to melt process. Therefore, the appl...

Claims

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Application Information

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IPC IPC(8): C08J3/03
Inventor 金华进顾利霞
Owner DONGHUA UNIV
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