US 11,998,877 B2
Method of preparation of new super-hydrophobic membranes and membranes obtained by said method
Norma Beatriz D'Accorso, Buenos Aires Buenos Aires (AR); Mariana Sosa, Lanús, Pcia. de Buenos Aires (AR); Ricardo Martin Negri, Ciudad Autónoma de Buenos Aires (AR); Graciela Rojas, Berisso, Pcia. de Buenos Aires (AR); María Elena Oneto, La Plata, Pcia. de Buenos Aires (AR); and Gabriel Lombardo, Ituzangó, Prov. de Buenos Aires (AR)
Assigned to YPF TECNOLOGIA S.A., Ciudad Autónoma de Buenos Aires (AR); and CONSEJO NACIONAL DE INVESTIGACIONES CIENTÍFICAS Y TÉCNICAS (CONICET), Ciudad Autónoma de Buenos Aires (AR)
Appl. No. 16/969,128
Filed by YPF TECNOLOGÍA S.A., Ciudad Autónoma de Buenos Aires (AR); and CONSEJO NACIONAL DE INVESTIGACIONES CIENTÍFICAS Y TÉCNICAS (CONICET), Ciudad Autónoma de Buenos Aires (AR)
PCT Filed Feb. 12, 2019, PCT No. PCT/IB2019/051127
§ 371(c)(1), (2) Date Aug. 11, 2020,
PCT Pub. No. WO2019/155446, PCT Pub. Date Aug. 15, 2019.
Claims priority of provisional application 62/786,250, filed on Dec. 28, 2018.
Claims priority of provisional application 62/629,366, filed on Feb. 12, 2018.
Prior Publication US 2021/0039049 A1, Feb. 11, 2021
Int. Cl. B01D 67/00 (2006.01); B01D 17/04 (2006.01); B01D 69/02 (2006.01); B01D 69/10 (2006.01); B01D 71/34 (2006.01); B01D 71/70 (2006.01); B05D 5/08 (2006.01); C25D 11/34 (2006.01)
CPC B01D 67/0069 (2013.01) [B01D 17/045 (2013.01); B01D 67/0006 (2013.01); B01D 67/00791 (2022.08); B01D 67/0095 (2013.01); B01D 69/02 (2013.01); B01D 69/105 (2013.01); B01D 71/34 (2013.01); B01D 71/701 (2022.08); B05D 5/08 (2013.01); B01D 2323/04 (2013.01); B01D 2323/08 (2013.01); B01D 2323/10 (2013.01); B01D 2325/38 (2013.01); C25D 11/34 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method for preparing a super-hydrophobic membrane comprising the steps of:
a) providing a metal mesh;
b) cleaning the metal mesh by immersion in an organic solvent;
c) subjecting the metal mesh cleaned in step b) to a surface modification treatment to increase its hydrophilicity, wherein said surface modification treatment comprises an electrochemical anodizing process in an aqueous NaOH solution, and wherein the metal mesh is then subjected to a treatment step with a suspension of nanoparticulated oxides comprising SiO2;
d) coating the metal mesh treated in step c) with a hydrophobic organic substance, wherein the metal mesh is coated by immersion in a solution of a hydrophobic silylated reagent, and wherein the hydrophobic organic substance is the hydrophobic silylated reagent;
e) drying the metal mesh treated in step d) in order to obtain the super-hydrophobic membrane,
wherein surface modification treatment with a suspension of nanoparticulated oxides comprising SiO2 of step c) multiplies the number of hydroxyl groups capable of reacting with the hydrophobic silylated reagent in step d), and
wherein the super-hydrophobic membrane obtained has a contact angle of 162°.