A kind of preparation method of superhydrophobic oleophobic composite film

A composite membrane and super-hydrophobic technology, applied in the direction of separation methods, chemical instruments and methods, membranes, etc., can solve the problems of difficult preparation of composite structures, unstable interface adhesion, complex preparation methods, etc., and achieve improved roughness and wide pore size Distribution, the effect of mild reaction conditions

Active Publication Date: 2021-06-01
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: A kind of preparation method of superhydrophobic oleophobic composite film

[0025] (1) Preparation of nano-silica sol solution: First, magnetically stir 15.5ml of tetraethyl orthosilicate stock solution with 10.0ml of absolute ethanol for 1 hour and store at 0°C to obtain solution A; then measure 2.5ml of deionized water , 1.0g of phosphoric acid and 10.0ml of absolute ethanol were magnetically stirred and mixed uniformly to obtain solution B, and the obtained solutions A and B were mixed and stirred, and after 3 hours of reaction, a nano-silica sol solution with uniform particle size distribution and good shape was obtained . The silica particle size is concentrated at 180nm, and it is a small spherical nano-particle, and the gel time is greater than 72h; the silica concentration in the sol is 12.67wt%;

[0026] (2) Preparation of cellulose acetate solution:

[0027] A mixed solvent with a mass ratio of acetone and dimethylacetamide (DMAC) of 1:8 was p...

Embodiment 2

[0034] Embodiment 2: A kind of preparation method of superhydrophobic oleophobic composite film

[0035] (1) According to the method described in Example 1, a sol solution with a silicon dioxide concentration of 12.67wt% was prepared.

[0036] (2) Preparation of cellulose acetate solution: preparation of acetone and dimethylformamide (DMF) mass ratio is a mixed solvent of 3:10, then, cellulose acetate is poured into the mixed solution to prepare cellulose acetate polymer solution, The mass fraction of cellulose acetate in the solution was 15%.

[0037] (3) Preparation of electrospinning precursor solution: take the nano-silica particle sol in step (1), add acetic acid and stir evenly, and mix and stir with the cellulose acetate solution in step (2) at room temperature for 3 hours. Obtain a precursor solution for electrospinning;

[0038] (4) Nano-silica sol solution in the hydrophobic modification step (1): After the two solutions are mixed and reacted for 2 hours in the ste...

Embodiment 3

[0043] Embodiment 3: A kind of preparation method of superhydrophobic oleophobic composite film

[0044] (1) According to the method described in Example 1, a sol solution with a silicon dioxide concentration of 12.67wt% was prepared.

[0045] (2) Preparation of cellulose acetate solution: N-methylpyrrolidone (NMP) mixed solvent with a mass ratio of 1:4, then pour cellulose acetate into the mixed solution to prepare cellulose acetate polymer solution, acetic acid in the solution The fiber mass fraction is 12%.

[0046] (3) Preparation of electrospinning precursor solution: take the nano-silica particle sol in step (1), add phosphoric acid and stir evenly, and mix and stir with the cellulose acetate solution in step (2) at room temperature for 3 hours. Obtain a precursor solution for electrospinning;

[0047] (4) Nano-silica sol solution in the hydrophobic modification step (1): After the two solutions are mixed and reacted for 2 hours in the step (1), add 0.30ml of dodecyltr...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D71/34B01D69/12B01D69/02B01D53/22
CPCB01D53/228B01D67/0002B01D69/02B01D69/12B01D71/34B01D2323/26B01D2323/39B01D2325/38
Inventor 侯得印林帝出钱盘生王军曹爱新丁春立
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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