Cellulose composite solvent system and application thereof
A composite solvent, cellulose technology, applied in the direction of artificial filaments in cellulose solution, can solve the problems of inability to meet industrial requirements, expensive LiOH, low solid content of cellulose, etc., to overcome the problem of easy gelation problems, reducing the difficulty of preparation and subsequent processing, and optimizing the effect of spinning performance
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Embodiment 1
[0039] 35 grams of NaOH are added to 392.5 grams of deionized water, stirred at normal temperature, then add 45 grams of urea and 20 grams of thiourea, 2.5 grams of ZnO, 5 grams of polyacrylamide, high-speed stirring to obtain a transparent and uniform composite solvent; The cellulose pulp that has been dried for 24 hours is added to the composite solvent while stirring, and a uniform cellulose suspension is obtained after mixing evenly, and then added to the pre-cooled twin-screw, the twin-screw speed is 316rpm, and the temperature of each section It is: the first stage: -6°C, the second stage: -10°C, the third stage: -12°C, the fourth stage: -10°C, the head: -8°C; obtained after dissolving in a twin-screw extruder Uniform cellulose solution, the cellulose concentration is 8wt%, and the gel time is 15hr.
Embodiment 2
[0041] 40 grams of NaOH was added to 370 grams of deionized water, stirred at normal temperature, then added 25 grams of urea and 50 grams of thiourea, 5 grams of ZnO, 10 grams of polyacrylamide, stirred at a high speed to obtain a transparent and uniform composite solvent; Add 24 grams of cellulose pulp dried for 24 hours into this composite solvent while stirring, and mix well to obtain a uniform cellulose suspension, which is added to the pre-cooled twin-screw, the twin-screw speed is 345rpm, and the temperature of each section It is: the first stage: -6°C, the second stage: -10°C, the third stage: -11°C, the fourth stage: -9°C, the head: -6°C; obtained after dissolving in a twin-screw extruder Uniform cellulose solution, the cellulose concentration is 10wt%, and the gel time is 21hr.
Embodiment 3
[0043] Add 45 grams of NaOH to 375 grams of deionized water, stir at normal temperature, then add 30 grams of urea and 30 grams of thiourea, 5 grams of ZnO, 15 grams of polyacrylamide, stir at a high speed to obtain a transparent and uniform composite solvent; The cellulose pulp that has been dried for 24 hours is added to the composite solvent while stirring, and a uniform cellulose suspension is obtained after mixing evenly, and then added to the pre-cooled twin-screw, the twin-screw speed is 403rpm, and the temperature of each section It is: the first stage: -6°C, the second stage: -8°C, the third stage: -10°C, the fourth stage: -8°C, the head: -6°C; obtained after dissolving in a twin-screw extruder Uniform cellulose solution, the cellulose concentration is 12wt%, and the gel time is 26.5hr.
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