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Green and recyclable cellulose solvent and preparation method thereof, and method for realizing cellulose regeneration

A cellulose solvent and cellulose regeneration technology, applied in the field of natural polymers, can solve problems such as poor recycling, insufficient stability, and low solubility, and achieve the effects of loose preparation conditions, broad commercial application prospects, and fast dissolution rate

Active Publication Date: 2022-04-29
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a green and recyclable cellulose solvent and its preparation method, as well as a method for realizing cellulose regeneration, so as to solve the problem of large environmental pollution and low solubility of solvents in the existing high molecular weight cellulose dissolution technology , Insufficient stability, poor recycling and other issues

Method used

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  • Green and recyclable cellulose solvent and preparation method thereof, and method for realizing cellulose regeneration
  • Green and recyclable cellulose solvent and preparation method thereof, and method for realizing cellulose regeneration
  • Green and recyclable cellulose solvent and preparation method thereof, and method for realizing cellulose regeneration

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Effect test

Embodiment 1

[0031] Step 1: Dissolve 8.0g of calcium chloride hexahydrate at 50.0°C to obtain molten salt of calcium chloride hexahydrate, then slowly add 2.0g of anhydrous lithium chloride to the molten salt of calcium chloride hexahydrate, increasing When the temperature reaches 80.0°C, a colorless and transparent mixed molten salt is obtained;

[0032] Step 2: After heating up the mixed molten salt obtained in Step 1 to 120.0°C, add 0.3g of natural cellulose (Mz=8.0×10 5 ) Slowly add the mixed molten salt, stir at 1000rpm for 5.0h, and keep the temperature at 120.0°C to obtain a concentrated cellulose solution;

[0033] Step 3: Pour the concentrated cellulose solution obtained in step 2 into a glass mold, then put the glass mold into 2.0% ethanol aqueous solution for regeneration, let it rest for 8.0 hours, and then wash away the molten salt with deionized water to obtain the regenerated cellulose hydrogel glue.

[0034] Through the characterization of the cellulose raw material and r...

Embodiment 2

[0036] Step 1: Dissolve 10.0g of calcium chloride hexahydrate at 50.0°C to obtain molten salt of calcium chloride hexahydrate, then slowly add 2.0g of anhydrous lithium chloride to the molten salt of calcium chloride hexahydrate, increasing When the temperature reaches 80.0°C, a colorless and transparent mixed molten salt is obtained;

[0037] Step 2: After heating up the mixed molten salt obtained in Step 1 to 90.0°C, add 0.12g of natural cellulose (Mz=8.0×10 5 ) Slowly add the mixed molten salt, stir at 1000rpm for 6.0h, and keep the temperature at 90.0°C to obtain a concentrated cellulose solution;

[0038] Step 3: Pour the concentrated cellulose solution obtained in step 2 into a glass mold, then put the glass mold into 10.0% ethanol aqueous solution for regeneration, let it rest for 8.0 hours, and then wash away the molten salt with deionized water to obtain the regenerated cellulose hydrogel glue.

Embodiment 3

[0040]Step 1: Dissolve 9.0g of calcium chloride hexahydrate at 50.0°C to obtain molten salt of calcium chloride hexahydrate, then slowly add 3.0g of anhydrous lithium chloride to the molten salt of calcium chloride hexahydrate, increasing When the temperature reaches 80.0°C, a colorless and transparent mixed molten salt is obtained;

[0041] Step 2: After heating up the mixed molten salt obtained in Step 1 to 110.0°C, add 0.6g of natural cellulose (Mz=8.0×10 5 ) Slowly add the mixed molten salt, stir at 1500rpm for 6.0h, and keep the temperature at 110.0°C to obtain a concentrated cellulose solution;

[0042] Step 3: Pour the concentrated cellulose solution obtained in step 2 into a glass mold, then put the glass mold into 5.0% ethanol aqueous solution for regeneration, let it rest for 8.0 hours, and then wash away the molten salt with deionized water to obtain a regenerated cellulose membrane.

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Abstract

The invention discloses a green and recyclable cellulose solvent and a preparation method thereof, and a method for realizing cellulose regeneration. The cellulose solvent is a mixed hydrated fused salt of calcium chloride hexahydrate and anhydrous lithium chloride, the content of the calcium chloride hexahydrate is 65.0%-90.0%, and the content of the anhydrous lithium chloride is 10.0%-35.0%. The cellulose solvent is prepared from calcium chloride hexahydrate and anhydrous lithium chloride, and the method is wide in raw material source, low in cost, free of toxic and harmful substances and environmentally friendly. The solvent system can be used for dissolving natural cellulose with the molecular weight as high as 8.0 * 10 < 5 > to obtain a cellulose solution with high solubility. A cellulose solution obtained by using the solvent is solidified and regenerated by a 5.0-10.0% ethanol water solution to prepare a cellulose membrane and gel.

Description

technical field [0001] The invention belongs to the technical field of natural polymers, and in particular relates to a green and recyclable cellulose solvent and a preparation method thereof, as well as a method for realizing cellulose regeneration. Background technique [0002] With the continuous development of human society, the contradiction between the shortage of fossil fuels and the ever-increasing demand for energy has become a major problem restricting the current social development. At the same time, the environmental pollution caused by the excessive exploitation and abuse of a large number of fossil fuels is always threatening human life. Therefore, reducing the use of fossil fuels, paying attention to environmental issues, and finding new renewable resources have become the focus of sustainable development. As a renewable resource with abundant storage and wide distribution on the earth, cellulose is considered to be one of the most promising biomass materials...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B16/00
CPCC08B16/00Y02W30/62
Inventor 黄海龙付晓彬刘一阳苗海越刘洪涛钱渊
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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