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Dimethylpolysiloxane composite membrane and preparation method and application thereof

A technology of polydimethylsiloxane and dimethylsiloxane, which is applied in the field of polydimethylsiloxane composite membrane and its preparation, can solve the problems of low organic solvent separation factor and poor separation performance, and achieve Improve the separation factor of ethanol/water, improve the separation factor, and simplify the effect of membrane making process

Inactive Publication Date: 2019-04-16
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention solves the technical problems of poor separation performance caused by agglomeration of inorganic particles in the polydimethylsiloxane membrane and low separation factor of organic solvents in the prior art

Method used

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  • Dimethylpolysiloxane composite membrane and preparation method and application thereof
  • Dimethylpolysiloxane composite membrane and preparation method and application thereof
  • Dimethylpolysiloxane composite membrane and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] (1) Prepare ZIF-8@GO and polydimethylsiloxane tetrahydrofuran mixed solution, the mass fraction of ZIF-8@GO and polydimethylsiloxane in the mixed solution is 20wt%, first 0.005g The ZIF-8@GO hybrid material containing 20mg GO content was added to 4.5ml tetrahydrofuran solution, stirred ultrasonically for 12h to make it uniformly dispersed, then added 0.995g polydimethylsiloxane, and continued ultrasonically stirred for 12h to obtain For a uniform mixed solution, the mass of ZIF-8@GO accounts for 0.5wt% of the mass of polydimethylsiloxane.

[0046] (2) Add crosslinking agent and catalyst to ZIF-8@GO and polydimethylsiloxane tetrahydrofuran mixed solution, polydimethylsiloxane: crosslinking agent: catalyst mass ratio 50:8:1, room temperature Stir at a lower temperature, and wait for the viscosity of the solution to increase, scrape-coat it on the polyvinylidene fluoride / non-woven microfiltration membrane to solidify and form a film. The crosslinking agent is one or more ...

Embodiment 2

[0048] The experimental operation was the same as in Example 1, except that in step (1), the content of GO in ZIF-8@GO was 30 mg.

Embodiment 3

[0050] The experimental operation was the same as that in Example 1, except that in step (1), the content of GO in ZIF-8@GO was 40 mg.

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Abstract

The invention discloses a dimethylpolysiloxane composite membrane and a preparation method and application thereof, and belongs to the field of membrane separation. The dimethylpolysiloxane compositemembrane comprises a mixed substrate layer, the mixed substrate layer is a membrane which is formed by porous hybrid material doped dimethylpolysiloxane after the dimethylpolysiloxane is cured, a porous hybrid material is the hybrid material of a metal organic framework material and a carboxyl group modified carbon material, and the metal organic framework material is connected with the carboxyl group modified carbon material through hydrogen bonds. The dimethylpolysiloxane composite membrane comprises a supporting layer, any of the surfaces of the supporting layer is coated with the mixed substrate layer, the supporting layer is a polymeric membrane, the supporting layer is non-woven fabric or the supporting layer is non-woven fabric which is coated with the polymeric membrane. Accordingto the dimethylpolysiloxane composite membrane, the composite membrane is prepared through a solution blending method, a membrane preparation technology is greatly simplified, inorganic particle aggregation is not caused, and the content of organic solvent separation factors of the obtained composite membrane is high.

Description

technical field [0001] The invention belongs to the field of membrane separation, and more specifically relates to a polydimethylsiloxane composite membrane and its preparation method and application. Background technique [0002] Polydimethylsiloxane composite membrane is a kind of polymer membrane commonly used in membrane separation process. Due to the strong hydrophobicity of polydimethylsiloxane, polydimethylsiloxane composite membranes have been widely studied for ethanol / water separation. The separation factor of pure polydimethylsiloxane membrane ethanol / water separation is about 5-8, which is completely unsatisfactory for industrial applications. The traditional preparation of polydimethylsiloxane membrane is to prepare a symmetrical polydimethylsiloxane membrane, and the selection layer is thicker, which affects the flux of ethanol. On the other hand, directly filling the inorganic particles into the polydimethylsiloxane matrix to modify the polydimethylsiloxane ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/70B01D69/12B01D69/02B01D67/00B01D61/36
CPCB01D61/362B01D67/0079B01D69/02B01D69/122B01D69/125B01D71/70
Inventor 王艳朱腾阳
Owner HUAZHONG UNIV OF SCI & TECH
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