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
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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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