Preparation method of hollow fiber internal pressure composite film
A composite membrane and fiber technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of poor mechanical properties, waste of membrane materials, low mechanical properties, etc., and achieve good separation performance and mechanical properties. The effect of avoiding membrane filament rupture and expanding the selection range
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[0023] Example 1
[0024] PVDF, dibutyl phthalate and polyethylene glycol are melted and blended uniformly in proportions of 40%, 20%, and 40% by mass to form a thermally induced phase separation method outer layer film forming system.
[0025] The PS, dimethylformamide, and pore-forming agent are dissolved and blended uniformly in proportions of 10%, 50%, and 40% by mass to form a non-solvent induced phase separation method inner layer film forming system. Among them, the pore-forming agent is composed of a mixture of water-soluble polymer polyvinylpyrrolidone and low-molecular-weight organic liquid Tween 80, and the mass percentage of polyvinylpyrrolidone is 70%, and Tween 80 is 30%.
[0026] Adopt the core liquid (water) of the center tube, the inner layer of the film forming system for the middle layer, and the outer layer of film forming system for the outer layer. The composite extrusion die with an inner diameter of 1.2mm is used to perform composite extrusion spinning accordi...
Example Embodiment
[0027] Example 2
[0028] PVDF, benzophenone and polyethylene glycol are melted and blended uniformly in proportions of 35%, 20%, and 45% by mass percentage respectively to form a thermally induced phase separation method outer layer film forming system.
[0029] The PES, the solvent dimethylacetamide, and the pore-forming agent are dissolved and blended uniformly in proportions of 20%, 60%, and 20% by mass respectively to form a non-solvent induced phase separation method inner layer film forming system. Among them, the pore-forming agent is composed of a mixture of a water-soluble polymer polyethylene glycol 6000 and a low-molecular-weight organic liquid Tween 80, and the mass percentage of polyethylene glycol 6000 is 80%, and Tween 80 is 20%.
[0030] Adopt the core liquid (water) of the center tube, the inner layer film-forming system for the middle layer, and the outer film-forming system for the outer layer. Use a composite extrusion die with an inner diameter of 1.0mm, and per...
Example Embodiment
[0031] Example 3
[0032] PVDF and diphenyl carbonate are melted and blended uniformly according to the mass percentages of 35% and 65%, respectively, to form a thermally induced phase separation method outer layer film forming system.
[0033] SPES, N-methylpyrrolidone, and pore-forming agent are dissolved and blended uniformly in proportions of 20%, 60%, and 20% by mass respectively to form a non-solvent induced phase separation method inner layer film forming system. Among them, the pore-forming agent is composed of a mixture of a water-soluble polymer polyethylene glycol 10000 and a low-molecular-weight organic liquid Tween 80. According to mass percentage, polyethylene glycol 10000 is 85% and Tween 80 is 15%.
[0034] Adopt the core liquid (water) of the center tube, the inner layer film-forming system for the middle layer, and the outer film-forming system for the outer layer. Use a composite extrusion die with an inner diameter of 1.3mm, and perform composite extrusion spinnin...
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