Method for preparing polyimide hollow fiber
A polyimide, hollow technology, applied in the field of preparation of polyimide hollow fibers, can solve the problems of difficult removal, high toxicity, and many solvent residues
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Embodiment 1
[0010] Example 1: Dissolve polyimide in NMP (N-methyl-2-pyrrolidone) to prepare a polyimide spinning stock solution with a concentration of 7% by mass, and leave it for one day until the polyimide is completely dissolved After filtration and vacuum defoaming; porogen PEG (polyethylene glycol, M n =6000g / mol) was dissolved in methanol to make a core liquid with a mass percentage concentration of 12%, the flow rate of the core liquid was controlled to 0.2L / h, and the dry spinning distance was adjusted to 8cm, and the spinning after filtration and vacuum defoaming The crude polyimide hollow fiber is obtained by dry-jet wet spinning through a spinning machine, and the crude polyimide hollow fiber is placed in a coagulation bath with a temperature of 20 ° C and a volume ratio of alcohol and water made from methanol to 1 / 4. Cool in medium, wrap the cooled crude polyimide hollow fiber with filter paper, use distilled water as the extractant, boil and reflux for 24 hours to completely...
Embodiment 2
[0011] Example 2: Polyimide was dissolved in DMSO (dimethyl sulfoxide) to form a polyimide spinning stock solution with a concentration of 10% by mass, and it was placed for one day until the polyimide was completely dissolved, then filtered and dried. Vacuum defoaming; PEO (polyethylene oxide, M n =5000g / mol) dissolved in methanol to make a core liquid with a mass percentage concentration of 16%, control the flow rate of the core liquid to 0.5L / h, adjust the dry spinning distance to 6cm, filter and defoam the polyimide The spinning stock solution is dry-jet-wet spun by a spinning machine to obtain crude polyimide hollow fibers. Cool in a coagulation bath, wrap the cooled crude polyimide hollow fiber with filter paper, use distilled water as the extractant, boil and reflux for 24 hours to completely remove the residual porogen and solvent, take it out, and dry it in an oven To constant weight, the pure finished polyimide hollow fiber is obtained. It has been determined that ...
Embodiment 3
[0012] Example 3: Polyimide is dissolved in DMF (N, N-dimethylformamide) to form a polyimide spinning stock solution with a concentration of 12% by mass, and the polyimide is left for 1 day After complete dissolution, filter and vacuum defoam; PVP (polyvinylpyrrolidone, M n =6200g / mol) was dissolved in ethanol to make a core liquid with a mass percentage concentration of 24%, the flow rate of the core liquid was controlled to 0.8L / h, the distance of the dry spinning process was adjusted to 4cm, and the spinning dope after degassing was spun The crude polyimide hollow fiber is obtained by dry-jet wet spinning on a silk machine, and the obtained crude polyimide hollow fiber is cooled in a coagulation bath with a temperature of 30 ° C and an alcohol-water volume ratio of 4 / 1 made from ethanol. Wrap the cooled crude polyimide hollow fiber with filter paper, use distilled water as the extractant, and boil and reflux for 24 hours to completely remove the residual porogen and solvent...
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