A kind of preparation method of superhydrophobic oleophobic composite film

Abstract

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 present invention uses a two-step spraying method to modify the surface of the cellulose acetate electrospun CA-SiNPs base film, so that the roughness of the electrospun CA film is further improved on the original basis, and a dense micron-nano hierarchical structure composite film is formed. Greatly improve the roughness of the film surface. At the same time, compared with the traditional amphiphobic membrane, the hydrophilic modified superamphiphobic membrane of the present invention has a wider pore size distribution and better flexibility, which broadens the source and application range of amphiphobic membrane materials. The invention not only has a simple film-forming process, is convenient to operate, and is easy to realize industrial production; but also the prepared composite membrane has good anti-pollution performance, high permeation flux, strong chemical stability, good mechanical properties, and high retention efficiency, and has wide application prospects.

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.