Super-hydrophobic-oleophobic composite membrane preparation method

Abstract

The invention relates to a hydrophilic modified super-hydrophobic-oleophobic composite membrane preparation method and particularly relates to a method for preparing a membrane by utilizing an electrostatic spinning method and performing two-time spray coating modification on the surface of the membrane. According to the preparation method disclosed by the invention, a two-step spray coating method is utilized to perform surface modification on a cellulose acetate electrostatic spinning CA-SiNPs basement membrane, so that the roughness of the electrostatic spinning CA membrane is further improved based on the original, a compact micron-nano cascade structure composite membrane is formed, and the roughness of the surface of the membrane is greatly improved. Meanwhile, compared with a traditional hydrophobic-oleophobic membrane, the hydrophilic modified super-hydrophobic-oleophobic composite membrane provided by the invention has wider pore diameter distribution and better softness; thus, a source and an application range of the hydrophobic-oleophobic membrane material are widened. The preparation method disclosed by the invention has the advantages of simple film formation technology, convenience in operation and easiness in achieving industrial production; furthermore, the prepared composite membrane has the advantages of good antifouling property, high permeation flux, strongchemical stability, good mechanical property, high interception efficiency and wide application prospect.

Description

【Technical field】 [0001] The invention relates to a method for preparing a hydrophilic modified superhydrophobic and oleophobic composite membrane, in particular to a method for preparing the membrane by electrostatic spinning and performing secondary spraying modification on the surface of the membrane. The composite membrane is suitable for dehydration and oil removal as an air filter membrane, or for anti-pollution of the outer packaging layer by low-concentration surfactants; it can also be used as a microfiltration membrane for antifouling and oil-water separation and filtration in industrial or textile industries; in addition , and its secondary spraying modification method can be used to simultaneously impart hydrophobic and oleophobic and antifouling properties to the product. 【Background technique】 [0002] Cellulose acetate (CA) refers to a thermoplastic resin obtained by esterifying acetic acid as a solvent and acetic anhydride as an acetylating agent under the ac...

AI Technical Summary

Problems solved by technology

However, these methods are all difficult to prepare nano-scale composite structures, and the preparation method is relatively complicated, and the process is difficult to control, such as Japanese Patent Application Publication No. 7-173025 (cosmetic composition mixed with fluorine compounds and waxes with specific melting points), JP-P10-237133 communique (tetrapolymer with (meth)acrylate Rf base and (meth)stearyl-acrylate and other two monomers as essential components), JP-P10-81873 Gazette (Mixture of Fluorinated Hydrophobic and Oleophobic Agent and Alcohol Containing Specific Chain Length Rf (Fluoroalkyl) Group or Alcohol Containing Perfluoropolyether Group), JP-A-8-109580 Gazette (Silicone Containing Amino Group and The reactants of ester compounds containing Rf groups), etc., the surface properties of the endowed products often require special adhesive treatment due to the instability of the interface.