Solvent composite and preparation method and use thereof

A technology of solvent composition and aqueous solution, which is applied in the field of solvent composition and its preparation and application, can solve the problems of insufficient solubility of cellulose and lack of large-scale application prospects, and achieve short production cycle, low raw material consumption and simple process Effect

Inactive Publication Date: 2004-03-17
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the disadvantage is that the solubility of cellulose is not high enough, and it lacks the prospect of large-scale application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 190 grams of 6.5wt% NaOH / 15wt% urea mixed aqueous solution (sodium hydroxide and urea are mixed in proportion, and water is added to make this solvent composition), placed in -5 ℃ ice-salt bath cooling, then add 10 grams of cotton linters The slurry (polymerization degree 500) was stirred rapidly to obtain a transparent cellulose solution. The viscosity of the cellulose solution measured by the falling ball method was about 60 Pa·S. Filter with 400-mesh gauze and poplin under 1-2MPa atmospheric pressure, the solution can be completely filtered, and there is no fiber visible to the naked eye in the obtained solution. The cellulose was completely dissolved to obtain a transparent solution of cellulose with a solubility of 100%.

Embodiment 2

[0016] 190 grams of 12wt% NaOH / 8.5wt% urea mixed aqueous solution (sodium hydroxide and urea are made into an aqueous solution and mixed uniformly to obtain the solvent composition), placed in a -5°C ice-salt bath for cooling, then added 10 grams of cotton linters The slurry (polymerization degree 500) was stirred rapidly to obtain a transparent cellulose solution. The viscosity of the cellulose solution measured by the falling ball method was about 60 Pa·S. Centrifuge at 10,000 rpm at 15°C for 30 minutes with an ultracentrifuge, and the cellulose solution remains unchanged from before centrifugation. Pour out the cellulose solution, no micelle precipitates at the bottom of the centrifuge cylinder, and no visible fibers exist in the resulting solution. The cellulose was completely dissolved to obtain a transparent solution of cellulose with a solubility of 100%.

Embodiment 3

[0018] 167.2 g of 9.1 wt% NaOH aqueous solution was cooled in an ice-salt bath at -5°C, and 22.8 g of urea was added for dissolution to obtain 190 g of 8 wt% NaOH / 12 wt% urea mixed aqueous solution. Add 10 grams of cotton linter pulp (polymerization degree 500) and stir rapidly to obtain a transparent cellulose solution. Centrifuge at 10,000 rpm at 15°C for 30 minutes with an ultracentrifuge, and the cellulose solution remains unchanged from before centrifugation. Pour out the cellulose solution, no micelle precipitates at the bottom of the centrifuge cylinder, and no visible fibers exist in the resulting solution. The cellulose was completely dissolved to obtain a transparent solution of cellulose with a solubility of 100%.

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Abstract

The solvent composition consists of sodium hydroxide 5-12 wt% and urea 8-20 wt% except water. The preparation process of the solvent composition is also provided. Water solution of sodium hydroxideand water solution of urea are mixed to compound the solvent composition; or sodium hydroxide is first compounded into water solution and urea is then added to compound the solvent composition. The solvent composition may be used in directly dissolving natural cellulose and regenerated cellulose to obtain transparent cellulose solution with high dissolubility and high concentration.

Description

technical field [0001] The present invention relates to a solvent composition and its preparation method and use. Background technique [0002] Due to the increasing environmental pollution caused by non-degradable plastic waste and the gradual depletion of petroleum resources in 50 years, the research and development of renewable resources has become increasingly attractive. Plant cellulose is the most abundant renewable organic resource on earth, and it is an environmentally friendly polymer material. Cellulose has attracted more and more attention due to its outstanding regeneration rate (100 billion tons / year), and is expected to become a functional material in the 21st century. However, in the chemical industry, cellulose is far from being fully utilized, mainly because the cellulose dissolution process in the existing technology is complicated, costly and polluting (J.Macromol.Sci.-Rev.Macromol.Chem., 1980, C18 (1), 1). At present, more than 90% of cellulose product...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/03C08L1/00
Inventor 张俐娜蔡杰周金平
Owner WUHAN UNIV
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