Hollow fiber nanofiltration membrane and preparation process thereof
A nanofiltration membrane and fiber technology, which is applied in the field of hollow fiber nanofiltration membrane and its preparation, can solve the problems of long dissolution time, long process flow, and short storage time when easy to be closed, achieve uniform pore size distribution of the membrane, and solve the problem of long process flow. , the effect of shortening the time of membrane pore retention
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[0029] Embodiment 1: A preparation method of hollow fiber nanofiltration membrane, the specific steps are:
[0030] 1) Extraction of spinning solution: Put 30 parts by mass of polyethersulfone, 2 parts of pore-forming agent, and 58 parts of organic solvent into the dissolving tank, and use the crusher to rotate at 66 revolutions / min and stir for 1 hour at 90°C. Stop for 30 seconds, reverse speed 66 revolutions / min, stir at 90°C for 50 minutes, stop for 30 seconds, mix, break and stir for 4 hours to fully dissolve and swell until it is completely dissolved into spinning solution;
[0031] 2) Spinning: pass the spinning solution of step 1) through a 300-mesh filter membrane to remove impurities, and then enter a vacuum deaeration device with a vacuum of -0.08 MPa, and a pretreatment at a temperature of 90℃ to remove bubbles for 12 minutes; The impurity-free bubble-free spinning solution is made into a nascent hollow fiber nanofiltration membrane by dry-jet wet spinning;
[0032] 3) Cu...
Example Embodiment
[0034] Embodiment 2: A preparation method of hollow fiber nanofiltration membrane, the specific steps are:
[0035] 1) Extraction of spinning solution: Put 30 parts by mass of polyethersulfone, 12 parts of pore-forming agent, and 58 parts of organic solvent into the dissolving tank, use the crusher to rotate at a normal speed of 133 rpm, stirring at 90°C for 1 hour, Stop for 60 seconds, reverse the speed at 133 revolutions / min, stir at 90°C for 50 minutes, mix, break and stir for 4 hours to fully dissolve and swell until it is completely dissolved into a spinning solution;
[0036] 2) Spinning: pass the spinning solution of step 1) through a 300-mesh filter membrane to remove impurities, and then enter a vacuum deaeration device with a vacuum of -0.1 MPa, and a pretreatment at 90°C to remove bubbles for 10 minutes; The impurity-free bubble-free spinning solution is made into a nascent hollow fiber nanofiltration membrane by dry-jet wet spinning;
[0037] 3) Curing: The nascent hollo...
Example Embodiment
[0039] Embodiment 3: A preparation method of hollow fiber nanofiltration membrane, the specific steps are:
[0040] 1) Extraction of spinning solution: Put 40 parts by mass of polyethersulfone, 12 parts of pore-forming agent, and 68 parts of organic solvent into the dissolving tank. Use the crusher to rotate at a normal speed of 133 revolutions / min and stir for 2 hours at 90°C. Stop for 60 seconds, reverse speed 133 rpm, 90℃ stirring for 59 minutes and stop for 30 seconds, mix, break and stir for 6 hours to fully dissolve and swell until it is completely dissolved into spinning solution;
[0041] 2) Spinning: pass the spinning solution of step 1) through a 400 mesh filter membrane to remove impurities, and then enter a vacuum deaeration device with a vacuum of -0.06 MPa, and a pretreatment at 90°C to remove bubbles for 14 minutes; The impurity-free bubble-free spinning solution is made into a nascent hollow fiber nanofiltration membrane by dry-jet wet spinning;
[0042] 3) Curing: t...
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