Preparation method of anti-pollution PTFE-CA/SiNPs composite film

A PTFE-CA, composite membrane technology, applied in chemical instruments and methods, membrane, membrane technology, etc., can solve the problems of short life, poor anti-fouling performance of hydrophobic membrane, unstable hydrophilic modification, etc.

Active Publication Date: 2017-12-26
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an anti-pollution PTFE-CA / SiNPs in order to overcome the technical problems of poor anti-pollution performance of hydrophobic membranes, unstable hydrophilic modification and short life and cannot be applied to membrane distillation separation process in the prior art Preparation method of composite membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: the preparation of anti-pollution PTFE-CA / SiNPs composite membrane of the present invention

[0021] (1) Prepare a silica sol solution with a certain particle size and shape: First, magnetically stir 15.5ml of tetraethyl orthosilicate stock solution with 10.0ml of absolute ethanol for 1 hour and store at 0°C; then measure 2.5ml of deionized Water, 1.0g of phosphoric acid and 10.0ml of absolute ethanol were magnetically stirred and mixed evenly, then mixed and stirred with the above solution, and reacted for 3 hours to obtain a nano-silica sol solution with uniform particle size distribution and good shape. The particle size of the silicon dioxide concentrates on 185nm, is a small spherical nano particle, and the gel time is longer than 72h; the concentration of the silicon dioxide in the sol is 12.67wt%.

[0022] (2) Preparation of cellulose acetate solution: preparation of acetone and dimethylacetamide (DMAC) mass ratio is a mixed solvent of 1: 8, then, c...

Embodiment 2

[0026] Embodiment 2: the preparation of anti-pollution PTFE-CA / SiNPs composite membrane of the present invention

[0027] (1) Preparation of 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; then measure 2.5ml of deionized water, 1.0g of phosphoric acid and 10.0 ml of absolute ethanol, magnetically stirred and mixed evenly, then mixed and stirred with the above solution, and reacted for 3 hours to obtain a nano-silica sol solution with uniform particle size distribution and good shape. The particle size of the silicon dioxide concentrates on 185nm, is a small spherical nano particle, and the gel time is longer than 72h; the concentration of the silicon dioxide in the sol is 12.67wt%.

[0028] (2) Preparation of cellulose acetate solution: preparation of acetone and N-methylpyrrolidone (NMP) mass ratio is a mixed solvent of 1: 4, then, cellulose acetate is poured into the ...

Embodiment 3

[0032] Embodiment 3: the preparation of anti-pollution PTFE-CA / SiNPs composite membrane of the present invention

[0033] (1) 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%.

[0034] (2) Preparation of electrospinning precursor solution: Take 1.5g of gas-phase nano-silica particles, add 2.0g of acetic acid and stir evenly, then mix and stir with 20.0g of cellulose acetate solution at room temperature for 3h to obtain a precursor for electrospinning body solution.

[0035] (3) Composite membrane prepared by electrospinning method: the uniformly dissolved solution is placed in an electrospinning equipment after standing for defoaming, and a commercial PTFE hydrophobic membrane is used as a base membrane. After setting the spinn...

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Abstract

The invention relates to a preparation method of an anti-pollution PTFE-CA / SiNPs composite film and particularly relates to a method for preparing a composite film with an anti-oil-pollution surface and a porous three-dimensional space net structure by virtue of an electrostatic spinning method. According to the preparation method, a super-hydrophilic anti-pollution layer is constructed on a PTFE surface of a hydrophobic group film by virtue of the electrostatic spinning method, and the PTFE-CA / SiNPs composite film is prepared. The preparation method has the beneficial effects that a film forming process is simple, the operation is convenient, and the industrial production is easily realized; and furthermore, the prepared composite film has good pollution resistance, high permeation flux, strong chemical stability, good mechanical property, high entrapment efficiency and wide application prospect.

Description

【Technical field】 [0001] The invention relates to a preparation method of anti-pollution (polytetrafluoroethylene-cellulose acetate / nano-silicon particles) PTFE-CA / SiNPs composite membrane, in particular to the preparation of surface oil pollution-resistant and porous three-dimensional space network by electrostatic spinning method method for composite membranes. The composite membrane is suitable for the membrane distillation process when the feed liquid is mixed with low-concentration crude oil or alkanes and other low surface active energy substances, and can also be used as a microfiltration membrane for microfiltration and directional selective filtration in industrial or medical fields. 【Background technique】 [0002] Membrane distillation is a membrane separation process that combines membrane technology and distillation process. It uses hydrophobic microporous membrane as the medium. Due to the hydrophobicity of the membrane, the aqueous solution on both sides canno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D69/12B01D69/02B01D67/00B01D61/36
CPCB01D61/364B01D67/0079B01D69/02B01D69/12B01D71/36B01D2311/2669B01D2323/39B01D2325/02B01D2325/04B01D2325/30B01D2325/38
Inventor 侯得印林帝出王军曹爱新丁春立
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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