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Cellulose solution and its preparing method

A cellulose solution and cellulose technology, applied in the field of cellulose solution and its preparation, can solve problems such as difficulties in industrialization implementation and limited ability to dissolve cellulose, and achieve the effects of easy recycling, high safety, and low viscosity

Inactive Publication Date: 2004-04-28
山东中科恒联生物基材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although NaOH solvents are cheap, their ability to dissolve cellulose is limited, and due to low temperature operation, it is difficult to implement industrially

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 1.0 g of pulp cellulose and shred it, soak it in 150 ml of NaOH aqueous solution (20%) for 2 hours, wash it with ethanol three times, and dry it in vacuum before use. Weigh 2.0 g of vacuum-dried EMIMAC ionic liquid, add 0.06 g of activated cellulose, heat in an oil bath at 80° C., and perform magnetic stirring. With the prolongation of time, the cellulose swells first; then a turbid solution is formed, and there are obvious fiber filaments under the polarizing microscope; finally, the solution gradually becomes clear and transparent, and the full field of view is black when observed under the polarizing microscope, indicating that The cellulose was completely dissolved, and the whole dissolution process lasted 24 hours, thereby preparing a cellulose solution with a concentration of 2.91 wt%.

Embodiment 2

[0021] Weigh 1.0g of pulp cellulose and shred it into a pressure-resistant container, introduce liquid ammonia (subject to the fact that the cellulose can be completely soaked), and treat it at room temperature with a pressure of 1.03MPa. After 2 hours, evaporate and remove the liquid ammonia , take out the activated cellulose and store it in a vacuum desiccator for replacement. Weigh 4.8g of BMIMAC ionic liquid, add 0.2g of pulp cellulose activated by liquid ammonia, heat in an oil bath at 100°C, and perform magnetic stirring. The cellulose gradually began to dissolve from the initial entangled state; within 3 hours, the solution was in a uniformly dispersed turbid state; continued stirring, the solution gradually became clear until the cellulose was completely dissolved, and no cellulose filaments existed when observed under a polarizing microscope. The dissolution process was 18 hours. A 4 wt% cellulose solution was thus prepared.

Embodiment 3

[0023] Weigh 0.947g of AMIMAC ionic liquid, add 0.0474g of cellulose activated by liquid ammonia (the activation method is the same as in Example 2), heat in an oil bath at 100°C, and perform magnetic stirring. The cellulose was obviously moistened and swelled at the beginning, and within 2 hours, the solution became yellow and turbid; the solution gradually became clear until it was completely dissolved under a polarizing microscope, and the dissolution process lasted 12 hours. A 4.8% by weight cellulose solution was thus obtained.

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Abstract

The cellulose solution consists of ionic liquid and cellulose in the weight ratio of 3-8 to 100. The ionic liquid is ionic liquid of 1-ethyl 3-methyl imidazol acetate, 1-allyl 3-methyl imidazol chlorate, 1-allyl 3-methyl imidazol acetate or 1-butyl 3-methyl imidazol acetate. The cellulose material is insoluble wood pulp fiber. The preparation process of the cellulose solution is also disclosed. The cellulose solution is used in producing various regenerated cellulose products.

Description

technical field [0001] The invention relates to a cellulose solution and a preparation method thereof. Background technique [0002] With the increasing global environmental pollution and the threat to sustainable development caused by the rapid depletion of petroleum energy and natural resources, as well as the improvement of public awareness of environmental protection, green industry has risen again as an important part of the green revolution. Plant cellulose is the most abundant renewable resource on earth, and it is an environmentally friendly material. [0003] Compared with synthetic macromolecules, cellulose has ① huge storage capacity in nature and ② rapid regeneration (the annual regeneration capacity of cellulose alone reaches 1.0×10 10 t) ③ easy to degrade, easy to modify and other advantages. [0004] As we all know, due to the characteristics of aggregated structure, high crystallinity and a large number of hydrogen bonds between molecules and molecules, nat...

Claims

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Application Information

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IPC IPC(8): C08J3/02C08L1/02
Inventor 张军任强何嘉松
Owner 山东中科恒联生物基材料有限公司
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