Super-hydrophobic composite membrane as well as preparation method and application thereof
A composite membrane, super-hydrophobic technology, applied in separation methods, chemical instruments and methods, membranes, etc., can solve the problems that the membrane contactor cannot run stably for a long time, the membrane contactor membrane is wetted, and the membrane absorption flux is affected. Excellent hydrophobicity, avoid membrane wetting, easy and controllable preparation process
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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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