A kind of superhydrophobic composite film and its preparation method and application
A composite membrane and super-hydrophobic technology, applied in the direction of separation methods, chemical instruments and methods, membranes, etc., can solve the problems that the membrane contactor cannot operate stably for a long time, affects the membrane absorption flux, and membrane wetting of the membrane contactor, etc., to achieve Excellent hydrophobicity, simple and controllable preparation process, and the effect of avoiding membrane wetting
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[0026] The invention provides a kind of preparation method of superhydrophobic composite membrane, comprises the following steps:
[0027] Using the immersion precipitation phase inversion method, mixing the first hydrophobic polymer, the porogen and the first solvent, and curing and molding to obtain the polymer base film;
[0028] Using the cloud point method, mixing the nanoparticles, the second hydrophobic polymer, the first part of the solubility parameter regulator and the second solvent to obtain a polymer solution, adding the second part of the solubility parameter regulator dropwise to the polymer solution , until the polymer solution appears turbid to obtain a nanoparticle-polymer suspension;
[0029] The nano particle-polymer suspension is coated on the polymer base film, and the obtained film is subjected to phase inversion to obtain a super-hydrophobic composite film.
[0030] In the present invention, unless otherwise specified, the required raw materials and re...
Embodiment 1
[0050] Superhydrophobic composite film made of hydrophobic SiO 2 A suspension composed of nanoparticles and irregular polyethersulfone particles is formed on the surface of the basement membrane, wherein the mass ratio of silica nanoparticles to polyethersulfone is 1:4; the particle size of silica nanoparticles is 30nm.
[0051] The preparation method of above-mentioned superhydrophobic composite film is:
[0052] (1) Preparation of polyethersulfone base membrane by immersion precipitation phase inversion method
[0053] Polyethersulfone base membrane: Add polyethersulfone powder (PES, 16g) into the container, followed by polyethylene glycol (PEG, 29g), and then DMAc (55g), the mass ratio of which is PES:PEG:DMAc=16 :29:55, and then stirred rapidly at 60°C until the solution was completely dissolved, and stood in vacuum for 24 hours for degassing to obtain the polyethersulfone casting solution; then put the glass plate on the film scraper, fix it with clips, and evenly spread...
Embodiment 2
[0063] The difference between this example and Example 1 is that the mass ratio of silicon dioxide and polyethersulfone is 1:2, that is, the added silicon dioxide is 0.5wt.%.
[0064] According to the method described in Example 1, the super-hydrophobic composite membrane was used to test the water contact angle and long-term desulfurization stability. °, SO 2 The absorption flux is 11.30×10 -4 (mol·m -2 ·s -1 ). After 12 hours of desulfurization operation, its water contact angle remained at 152°, SO 2 The absorption flux is as high as 11.31×10 -4 (mol·m -2 ·s -1 ). After 12 hours of long-term desulfurization test, the water contact angle of the superhydrophobic polyethersulfone composite membrane has almost no change, excellent wettability resistance, SO 2 The absorption flux does not have any decline, the desulfurization performance is relatively stable, and has high desulfurization performance.
[0065] Desulfurization performance and water contact angle of the s...
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Abstract
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