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Cellulose solution and preparation method thereof

A cellulose solution and cellulose technology, applied in the field of cellulose solution and its preparation, can solve the problems of difficult solvent recovery, limitation of fiber variety and production cost and efficiency, poor thermal stability of the solvent, etc. The effect of unified optimization and cost reduction

Active Publication Date: 2011-06-08
CHINESE TEXTILE ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Lyocell also has some disadvantages in the production process: mainly due to the poor thermal stability of the solvent, the difficulty of solvent recovery, the types of fibers obtained, and the production cost and efficiency are limited.
[0005] The German patent with the application number DE200410031025 published on January 5, 2006, entitled "Cellulose Forming Process and Equipment", provides a process and equipment for dissolving cellulose using 1,3-dialkylimidazole chloride as a solvent , which does not involve the use of ionic liquid compounding scheme

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]Mix 24 parts of 1-ethyl-3-methylimidazole acetate and 64 parts of 1-benzyl-3-methylimidazole chloride evenly, and add 10 parts of wood pulp cellulose to the above-mentioned mixed ionic liquid to obtain an ionic liquid and cellulose mixture, stirring and kneading, shearing, and vacuuming to remove bubbles and volatile impurities in the solution under a vacuum of 0.94 bar, and raising the temperature to 120°C to finally obtain a uniform and transparent solution with a concentration of 10.2% , the viscosity is 1150Pa·S.

Embodiment 2

[0032] Mix 54 parts of 1-ethyl-3-methylimidazole acetate and 34 parts of 1-ethyl-3-methylimidazole chloride evenly, and add 10 parts of cotton pulp cellulose to the above-mentioned mixed ionic liquid to obtain an ionic liquid and cellulose mixture, stirring and kneading, shearing, and vacuuming to remove bubbles and volatile impurities in the solution under a vacuum of 0.95 bar, and raising the temperature to 95°C to finally obtain a uniform and transparent solution with a concentration of 10.2%. , the viscosity is 580Pa·S.

Embodiment 3

[0034] Mix 6 parts of 1-ethyl-3-methylimidazole acetate, 6 parts of 1-ethyl-3-methylimidazole chloride, and 76 parts of 1-benzyl-3-methylimidazole chloride at room temperature, Then the temperature of the mixed ionic liquid is raised to 50° C. to promote a more uniform mixture, and then 7.6 parts of cotton pulp cellulose are added to the above-mentioned mixed ionic liquid to obtain a mixture of ionic liquid and cellulose. Stir and knead under vacuum, shear and vacuumize to remove bubbles and volatile impurities in the solution, and raise the temperature to 115°C to finally obtain a uniform and transparent solution with a concentration of 8% and a viscosity of 1110Pa·S.

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Abstract

The invention relates to a cellulose solution, which comprises the following compositions: cellulose which occupies 5.0 to 30.0 percent of the weight of the cellulose solution, and other compositions which are compositions of ionic liquid chloridizing 1-benzyl-3-methylimidazole or / and chloridizing 1-ethyl-3-methylimidazole and acetic 1-ethyl-3-methylimidazole. The cellulose solution is prepared by the following method: crushed cellulose slurry is mixed with the other compositions, and the uniform cellulose solution is prepared through the process steps and methods of temperature rise, stirring, vacuum-pumping, kneading and shearing. By adoption of the method to prepare the cellulose solution, the uniform and stable cellulose solution which is suitable for different use requirements can beprepared by integrating the advantages of different ionic liquids; the uniform optimization of the technique, equipment and products are realized; and the cellulose solution is suitable for industrialized production.

Description

technical field [0001] The invention relates to a cellulose solution and a preparation method thereof. Background technique [0002] Cellulose is one of the most widely distributed and largest reserves of natural resources in nature, and its renewable and degradable properties meet the requirements of contemporary circular economy and green environmental protection. However, its application and development have been limited by technology, especially the chemical reaction process and pollution in the production process of viscose fiber have always been the concern of people, which gave birth to the birth of directly dissolving cellulose solvent. Lyocell is prepared by directly dissolving cellulose in the organic cellulose solvent N-methylmorpholine-N-oxide (NMMO). The solvent is non-toxic and recyclable. There is no chemical reaction process, no Pollution is now industrialized. However, Lyocell also has some disadvantages in the production process: mainly due to the poor th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L1/02C08K5/3445C08J3/09
Inventor 李晓俊孙玉山骆强陆伊伦徐成朱庆松徐纪刚陈功林
Owner CHINESE TEXTILE ACAD
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