A polyvinylidene fluoride film with differential hydrophobicity on both sides and its preparation method and application
A polyvinylidene fluoride membrane and polyvinylidene fluoride-based membrane technology are applied in the field of polyvinylidene fluoride membrane and its preparation, which can solve the problem of increasing gas mass transfer resistance, inability of a membrane contactor to run stably for a long time, and decreasing mass transfer rate. and other problems, to achieve the effect of reducing mass transfer resistance, excellent desulfurization performance, and avoiding membrane wetting
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[0044] In the present invention, the preparation method of the hydrophobic nanoparticle-polymer suspension preferably comprises the following steps:
[0045] After mixing the non-solvent and the polymer, the first ultrasound and the first stirring are performed in sequence to obtain a mixed solution;
[0046] The solvent and the hydrophobic nanoparticles are sequentially added to the mixed solution, and then the second ultrasonic wave and the second stirring are sequentially performed to obtain a hydrophobic nanoparticle-polymer suspension.
[0047] In the present invention, the time of the first ultrasonic is preferably 0.5~2h, the time of the first stirring is preferably 0.5~2h; the time of the second ultrasonic is preferably 10~30min, and the time of the second stirring is preferably 12 ~16h; both the first stirring and the second stirring are preferably magnetic stirring; after the mixed solution is obtained, the present invention preferably slowly adds the solvent to the ...
Embodiment 1
[0068] The superhydrophobic layer of polyvinylidene fluoride membrane with differential hydrophobicity on both sides is composed of hydrophobic nano-silica (particle size: 30nm) and PVDF (polyvinylidene fluoride film) particles (particle size: 1μm), in which the hydrophobic nanometer The mass ratio of silicon oxide and polyvinylidene fluoride is 1:2.
[0069] The preparation method of the polyvinylidene fluoride film with differential hydrophobicity on both sides is as follows:
[0070] (1) Preparation of polyvinylidene fluoride-based film: Add 16wt.% polyvinylidene fluoride, 8wt.% ethylene glycol and 86wt.% dimethylacetamide into a three-necked flask, and stir evenly at 60°C for more than 6 hours to obtain cast Membrane fluid. The polyvinylidene fluoride-based membrane was prepared by the immersion precipitation phase inversion method (the operation method was the same as step (2) of Comparative Example 1).
[0071] (2) Preparation of silica-polyvinylidene fluoride suspensi...
Embodiment 2
[0082]The superhydrophobic layer of polyvinylidene fluoride film with differential hydrophobicity on both sides is composed of hydrophobic nano-silica (particle size 30nm) and PVDF particles (particle size 1μm), in which the mass of silicon dioxide and polyvinylidene fluoride The ratio is 1:1.
[0083] The preparation method of the polyvinylidene fluoride film with differential hydrophobicity on both sides is as follows:
[0084] (1) Preparation of polyvinylidene fluoride-based film: refer to Example 1, and obtain a polyvinylidene fluoride-based film according to its preparation method.
[0085] (2) The preparation of the silica-polyvinylidene fluoride suspension is the same as that in Example 1, except that: 1wt.% hydrophobic nano-silica, 83wt.% dimethylacetamide.
[0086] (3) The spin-coating steps were the same as in Example 1, and a polyvinylidene fluoride film with differentiated hydrophobicity on both sides was prepared.
[0087] Performance Testing:
[0088] Observat...
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