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Cellulose solution and dissolving method and application thereof

A cellulose solution and cellulose technology, applied in the field of natural polymers, can solve the problems of low molecular weight, harsh conditions, and high cost of dissolving cellulose, and achieve easy recovery and recycling, simple waste liquid treatment and recovery, and strong solubility Effect

Active Publication Date: 2017-09-19
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 shortcomings of the prior art, such as complicated cellulose dissolving process, high cost and pollution, low molecular weight of dissolved cellulose, harsh conditions, poor stability of cellulose solution, etc., the present invention provides a A method for dissolving cellulose with ammonium, which can simply and quickly dissolve high-molecular-weight cellulose, and the conditions are easy to control, and the solution has good stability, has no pollution to the environment, and is easy to recover and recycle

Method used

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  • Cellulose solution and dissolving method and application thereof
  • Cellulose solution and dissolving method and application thereof
  • Cellulose solution and dissolving method and application thereof

Examples

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Effect test

Embodiment 1

[0028] Take cotton linter pulp (viscosity average molecular weight M η =0.7×10 5 ) 5 grams, put it into 95 grams of 1.88M tetramethylammonium hydroxide aqueous solution, shake evenly at room temperature (25°C), put it in the freezer of the refrigerator and cool it at -22°C until the mixture is completely frozen, and place it at room temperature ( 25°C) to obtain a transparent cellulose solution after thawing. The content of cellulose in the prepared cellulose solution is 5 wt%, the concentration of tetramethylammonium hydroxide is about 1.88M, and the rest is water.

Embodiment 2

[0030] Take cotton linter pulp (M η =0.7×10 5 ) 6 grams, put it into 94 grams of 1.88M triethylmethylammonium hydroxide aqueous solution, shake evenly at room temperature (25°C), put it in the freezer of the refrigerator and cool it down to -22°C until the mixture is completely frozen, and place it for 4 hours. Thaw at room temperature (25°C) to obtain a transparent cellulose solution. The content of cellulose in the prepared cellulose solution is 6 wt%, the concentration of triethylmethylammonium hydroxide is about 1.88M, and the rest is water.

Embodiment 3

[0032] Take cotton linter pulp (M η =0.7×10 5 ) 8 grams, put it into 92 grams of 1.88M tetraethylammonium hydroxide aqueous solution, shake evenly at room temperature (25°C), put it in the freezer of the refrigerator and cool it at -22°C until the mixture is completely frozen, and place it at room temperature ( 25°C) to obtain a transparent cellulose solution after thawing. The cellulose content in the prepared cellulose solution is 8 wt%, the concentration of tetraethylammonium hydroxide is about 1.88M, and the rest is water.

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Abstract

The invention discloses a cellulose solution and a dissolving method and application thereof. The cellulose solution is prepared by dispersing cellulose in alkyl ammonium hydroxide solution with concentration of 0.5-2.5 M; settling the solution at -10 to -30 DEG C until the dispersing fluid is completely frozen; continuing to freeze for 0-12 hours and then unfreezing the solution at room temperature to obtain uniform and transparent cellulose solution. The alkyl ammonium hydroxide is one or several of tetramethylammonium hydroxide, triethyl methyl hydroxide, tetraethylammonium hydroxide, benzyltrimethylammonium hydroxide, and benzyltriethylammonium hydroxide. The cellulose solution is applicable to natural cellulose of which molecular weight is 7.0x104-3.0x105; the cellulose solution is simple and convenient to operate, strong in dissolving ability, strong in cellulose solution stability, and free from environmental pollution; the dissolution is a physical process and free from chemical reaction; the solvent system is one-component solvent, the prepared cellulose solution can regenerate cellulose through water coagulating bath; alkyl ammonium hydroxide in the waste fluid is easy to recycle and reuse, and has very wide application prospect.

Description

technical field [0001] The invention relates to a cellulose solution and its dissolving method and application, belonging to the field of natural polymers. Background technique [0002] In the 21st century, raw materials for renewable energy and resources, environmentally friendly materials and sustainable development technologies have become important directions for scientific and technological research and development. Plant cellulose is the most abundant renewable resource on the earth. It is an environmentally friendly material. Making full use of cellulose can not only protect the environment, but also save limited petroleum resources. However, cellulose is far from being fully utilized in the chemical industry. The main reason is that the cellulose dissolution process in the existing process is complicated, costly and polluting. Such as the viscose method has environmental pollution, high price and solution recovery problems; other organic or inorganic solvents such a...

Claims

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Application Information

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IPC IPC(8): C08J3/05C08J5/18C08L1/02
Inventor 吕昂王洋张俐娜
Owner WUHAN UNIV
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