A kind of chitin nanocrystal composite polysulfone hollow fiber membrane and preparation method thereof
A technology of chitin nanocrystals and fiber membranes, applied in the field of separation membranes, can solve the problems of industrial production limitations, poor membrane surface quality, and difficulty in membrane production, and achieve the effect of improving mechanical strength, improving comprehensive performance, and simple and easy methods
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Embodiment 1
[0033] Chitin nanocrystals with a diameter of 4 nm and a length of 40 nm were uniformly dispersed in dimethylacetamide, polysulfone and sulfonated polysulfone with a sulfonation degree of 20% were added, stirred and dissolved into a uniform solution, and allowed to stand Degassing to obtain the casting solution, the formula of the casting solution by mass percentage is: polysulfone 12%, chitin nanocrystal 0.2%, sulfonated polysulfone 1.5%, dimethylacetamide 86.3%; dimethylacetamide A mixed solution of amide and water with a volume ratio of 1:3 was used as the core fluid. The casting liquid and the core liquid are simultaneously extruded through the annular spinning head of the submerged precipitation phase inversion spinning device to form a tubular liquid film. The flow rate of the casting liquid is 20 g / min, the flow rate of the core liquid is 20 ml / min, and the tubular liquid film After passing through an air gap of 7 cm, enter the coagulation bath of water and solidify for...
Embodiment 2
[0036] Chitin nanocrystals with a diameter of 10 nm and a length of 300 nm were uniformly dispersed in dimethyl sulfoxide, polysulfone and sulfonated polysulfone with a sulfonation degree of 50% were added, stirred and dissolved into a uniform solution, and allowed to stand Degassing to obtain the casting solution, the formulation of the casting solution by mass percentage is: polysulfone 20%, chitin nanocrystal 2%, sulfonated polysulfone 7%, dimethyl sulfoxide 71%; dimethyl sulfoxide A mixed solution of sulfone and water with a volume ratio of 1:4 was used as the core fluid. The casting liquid and the core liquid were simultaneously extruded through the annular spinning head of the submerged precipitation phase inversion spinning device to form a tubular liquid film. The flow rate of the casting liquid was 10 g / min, and the flow rate of the core liquid was 10 ml / min. After passing through an air gap of 15 cm, the membrane was solidified in a water coagulation bath for 24 hour...
Embodiment 3
[0039]Chitin nanocrystals with a diameter of 10 nm and a length of 100 nm were uniformly dispersed in an organic solvent (a mixture of dimethylacetamide and dimethyl sulfoxide at a volume ratio of 1:1), and polysulfone and sulfone The sulfonated polysulfone with a sulfonation degree of 30% is stirred and dissolved into a uniform solution, left to stand for degassing, and a casting solution is obtained. The formula of the casting solution in terms of mass percentage is: 30% polysulfone, 4% chitin nanocrystals, Sulfonated polysulfone 3%, organic solvent 63%; the mixture of dimethylacetamide and dimethyl sulfoxide (dimethylacetamide and dimethyl sulfoxide mixed at a volume ratio of 1:1) and The water volume ratio is 1:3 mixed as the core fluid. The casting liquid and the core liquid are simultaneously extruded through the annular spinning head of the submerged precipitation phase inversion spinning device to form a tubular liquid film. The flow rate of the casting liquid is 10 g / ...
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