Method for preparing cellulose composite sodium filter membrane
A composite nanofiltration membrane, cellulose technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. big effect
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[0021] The present invention provides a preparation method of a cellulose composite nanofiltration membrane, which consists of four steps, and the specific embodiments of each step are as follows:
[0022] 1) Add 1.0-20.0% by mass of cellulose or its derivatives and 60.0-99.0% by mass of ionic liquid into a high temperature resistant container, heat to 80-150°C under argon protection, and under mechanical stirring Dissolve uniformly to obtain a film-forming solution;
[0023] The best conditions: the mass fraction of cellulose is 4%~12%, and the heating temperature is 80~120℃.
[0024] 2) using a scraper to evenly scrape the film-forming solution on the non-woven support body, and the thickness of the film-forming solution layer is 50-300 microns;
[0025] Optimal conditions: coating thickness: 100 to 200 microns.
[0026] 3) exposing the non-woven fabric coated with the film-forming solution in the air for 5-80 seconds, and then immersing it in a coagulation bath with a tem...
Example Embodiment
[0032] Example 1:
[0033] The ionic liquid 1-allyl-3-methylimidazolium chloride ([AMIM]Cl) with a mass percentage of 1% cellulose (a-cellulose) with a mass percentage of 98% was added to a high temperature resistant container, The temperature was raised to 80°C under the protection of argon gas, and the cellulose was fully dissolved and uniform under mechanical stirring to obtain a clear coating solution; the cellulose coating solution was uniformly coated on the polypropylene (PP) non-woven fabric, and the coating thickness was is 300 microns; the air exposure time is 20 seconds, and then immersed in a coagulation bath at 10 ° C, the coagulation bath is deionized water, and the coated cellulose solution is coagulated to obtain a cellulose composite film; the cellulose composite film is dried in the shade, soaked In the n-hexane solution of trimesoyl chloride, the mass fraction is 0.1%, and it is taken out after 5 minutes; then the membrane is placed in an oven at 60° C. for ...
Example Embodiment
[0034] Example 2:
[0035]The ionic liquid 1 allyl-3-methylimidazolium chloride ([AMIM]Cl) with a mass percentage of 4% cellulose (a-cellulose) with a mass percentage of 96% was added to a high temperature resistant container, The temperature was raised to 80°C under the protection of argon, and the cellulose was fully dissolved and uniform under mechanical stirring to obtain a clear coating solution; the cellulose coating solution was uniformly coated on the polyester (PET) non-woven fabric, and the coating thickness was is 150 microns; the air exposure time is 10 seconds, and then immersed in a coagulation bath at 15 ° C, the coagulation bath is deionized water, and the coated cellulose solution is coagulated to obtain a cellulose composite film; the cellulose composite film is dried in the shade, soaked In the n-hexane solution of succinic anhydride, the mass fraction is 1%, and taken out after 10 minutes; then the membrane is placed in an oven at 70° C. for 20 minutes to o...
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