Method for preparing hydrophilic polytetrafluoroethylene hollow fiber film
A technology of polytetrafluoroethylene and fiber membranes, which is applied in the field of hollow fiber membrane preparation, can solve the problems of non-alkali resistance, strong hydrophobicity of polytetrafluoroethylene hollow fiber membranes, and limited application fields, and achieve low cost and great practicality The effect of value and method is simple and easy
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Embodiment 1
[0021] a) Preparation of silica sol: Add ammonia water dropwise into absolute ethanol, the volume ratio of ammonia water and absolute ethanol is 1:50, stir at 40°C for 20 minutes to form a mixed solution of ammonia water and ethanol, and then add ammonia water and ethanol to the mixed solution Ethyl orthosilicate is added dropwise in the middle, the volume ratio of ammonia water ethanol mixed solution and ethyl orthosilicate is 1:50, stirs 60 minutes under 60 ℃, forms silica sol;
[0022] b) Mixing: Select polytetrafluoroethylene dispersion resin powder with a molecular weight of 2 million, mix polytetrafluoroethylene dispersion resin powder, liquid paraffin and silica sol in a mass percentage of 1:0.22:0.05, and statically mix at 40°C Place for 60 hours to fully mix the polytetrafluoroethylene dispersion resin powder, liquid paraffin, and silica sol to form polytetrafluoroethylene materials;
[0023] c) Compaction and extrusion: Press the polytetrafluoroethylene material on a...
Embodiment 2
[0028] a) Preparation of silica sol: Add ammonia water dropwise into absolute ethanol, the volume ratio of ammonia water and absolute ethanol is 5:50, stir at 40°C for 20 minutes to form a mixed solution of ammonia water and ethanol, and then add ammonia water and ethanol to the mixed solution Ethyl orthosilicate is added dropwise in the middle, the volume ratio of ammonia water ethanol mixed solution and ethyl orthosilicate is 10:50, stirs 120 minutes under 60 ℃, forms silica sol;
[0029] b) Mixing: Select polytetrafluoroethylene dispersion resin powder with a molecular weight of 10 million, mix polytetrafluoroethylene dispersion resin powder, petroleum ether and silica sol in a mass percentage of 1:0.40:0.20, and statically mix at 20°C Place it for 80 hours to fully mix the polytetrafluoroethylene dispersion resin powder, petroleum ether and silica sol to form a polytetrafluoroethylene material;
[0030] c) Compacting and extrusion: Press the polytetrafluoroethylene materia...
Embodiment 3
[0035]a) Preparation of silica sol: Add ammonia water dropwise into absolute ethanol, the volume ratio of ammonia water and absolute ethanol is 3:50, stir at 40°C for 20 minutes to form a mixed solution of ammonia water and ethanol, and then add ammonia water and ethanol to the mixed solution Ethyl orthosilicate is added dropwise in the middle, the volume ratio of ammonia water ethanol mixed solution and ethyl orthosilicate is 4:50, stirs 80 minutes under 60 ℃, forms silica sol;
[0036] b) Mixing: Select polytetrafluoroethylene dispersion resin powder with a molecular weight of 5 million, mix polytetrafluoroethylene dispersion resin powder, kerosene and silica sol in a mass percentage of 1:0.28:0.10, and let stand at 25°C After 70 hours, the polytetrafluoroethylene dispersed resin powder, kerosene, and silica sol are fully mixed to form polytetrafluoroethylene materials;
[0037] c) Compaction and extrusion: Press the polytetrafluoroethylene material on a compactor to form a ...
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