Method for synthesizing nano silicon dioxide modified PVDF (polyvinylidene fluoride) hydrophobic microporous membrane in situ

A nano-silica, in-situ synthesis technology, applied in the direction of chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of reduced membrane flux, poor dispersion, easy to block membrane pores, etc., to improve the microstructure, improve Dispersibility, effect of increasing hydrophobicity

Inactive Publication Date: 2018-09-07
GUANGXI UNIV FOR NATITIES
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  • Claims
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Problems solved by technology

[0007] The object of the present invention is: the present invention provides a kind of method of in-situ synthesis nano-silica modified PVDF hydrophobic microporous membrane, obtains a kind of in-situ synthesis nano-silica modification and prepares PVDF hydrophobic microporous membrane, in PVDF On the basis of the original excellent characteristics of the hydrophobic microporous membrane, the microstructure of the PVDF hydrophobic microporous membrane is improved, the membrane pore size and porosity are increased, the hydrophobicity of the PVDF hydrophobic microporous membrane is increased, and the aggregation of nanoparticles in the casting solution is overcome. ph

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  • Method for synthesizing nano silicon dioxide modified PVDF (polyvinylidene fluoride) hydrophobic microporous membrane in situ
  • Method for synthesizing nano silicon dioxide modified PVDF (polyvinylidene fluoride) hydrophobic microporous membrane in situ
  • Method for synthesizing nano silicon dioxide modified PVDF (polyvinylidene fluoride) hydrophobic microporous membrane in situ

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Embodiment 1

[0049] A method for in-situ synthesis of nano silicon dioxide modified PVDF hydrophobic microporous membrane, comprising the following steps:

[0050] (1) Preparation of PVDF solution: PVDF powder is mixed with dispersing solvent I, stirred uniformly to obtain PVDF solution; the mass ratio of the PVDF powder and dispersing solvent I is 3:17; the dispersing solvent I is N, N- Dimethylacetamide; the stirring speed is 400r / min, the temperature is 52°C, and the stirring time is 1.1h;

[0051] (2) Prepare a solution containing nano-silica: add absolute ethanol, hydrochloric acid, water to the magnetic stirring container, magnetically stir and mix evenly, then quickly drop the ethanol solution that is dissolved with ethyl orthosilicate, after the dropwise addition is completed Under the condition of 25°C, the in-situ synthesis reaction was carried out for 4h to obtain a solution containing nano silicon dioxide; the volume ratio of tetraethyl orthosilicate, water, hydrochloric acid a...

Embodiment 2

[0056] A method for in-situ synthesis of nano silicon dioxide modified PVDF hydrophobic microporous membrane, comprising the following steps:

[0057] (1) Preparation of PVDF solution: PVDF powder is mixed with dispersing solvent I, and stirred evenly to obtain PVDF solution; the mass ratio of the PVDF powder and dispersing solvent I is 3:25; the dispersing solvent I is N, N- Dimethylformamide; the stirring speed is 600r / min, the temperature is 60°C, and the stirring time is 3h;

[0058] (2) Prepare a solution containing nano-silica: add absolute ethanol, hydrochloric acid, water to the magnetic stirring container, magnetically stir and mix evenly, then quickly drop the ethanol solution that is dissolved with ethyl orthosilicate, after the dropwise addition is completed Carry out the in-situ synthesis reaction at 58° C. for 10 h to obtain a solution containing nano-silica; the volume ratio of tetraethyl orthosilicate, water, hydrochloric acid and absolute ethanol is 1:10:1:1; ...

Embodiment 3

[0063] A method for in-situ synthesis of nano silicon dioxide modified PVDF hydrophobic microporous membrane, comprising the following steps:

[0064] (1) Preparation of PVDF solution: PVDF powder is mixed with dispersing solvent I and stirred evenly to obtain PVDF solution; the mass ratio of the PVDF powder and dispersing solvent I is 3:21; the dispersing solvent I is N-methyl Pyrrolidone; the stirring speed is 510r / min, the temperature is 55°C, and the stirring time is 2h;

[0065] (2) Prepare a solution containing nano-silica: add absolute ethanol, hydrochloric acid, water to the magnetic stirring container, magnetically stir and mix evenly, then quickly drop the ethanol solution that is dissolved with ethyl orthosilicate, after the dropwise addition is completed Under the conditions of 43° C., the in-situ synthesis reaction was carried out for 7 hours to obtain a solution containing nano silicon dioxide; the volume ratio of tetraethyl orthosilicate, water, hydrochloric aci...

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Abstract

The invention discloses a method for synthesizing a nano silicon dioxide modified PVDF (polyvinylidene fluoride) hydrophobic microporous membrane in situ. The method comprises: preparing a PVDF solution, preparing a solution containing nano silicon dioxide, preparing a casting solution, casting, forming a membrane, drying and the like. According to the invention, the excellent characteristics of the PVDF hydrophobic microporous membrane are maintained, at the same time, the microstructure of the PVDF hydrophobic microporous membrane is improved, the membrane pore size, the membrane porosity and the membrane hydrophobicity are increased, the agglomeration of nanoparticles in the casting solution is overcome, the dispersibility of the nano silicon dioxide in the casting solution is improved,the hydrophobicity, membrane flux, chemical stability and membrane strength of the PVDF hydrophobic microporous membrane are enhanced, and the problem of reduction of the membrane flux caused by poordispersibility, prone agglomeration and easy blockage of membrane pores of the nanoparticles in the casting solution when inorganic nanoparticles are modified in the preparation of the PVDF hydrophobic microporous membrane is solved, so that the membrane is endowed with the characteristics of large water flux, high membrane flux, high hydrophobicity, high mechanical strength, and stable chemicalproperties.

Description

technical field [0001] The invention belongs to the field of membrane material preparation science and technology, and specifically relates to a method for in-situ synthesis of nano silicon dioxide modified PVDF hydrophobic microporous membrane. Background technique [0002] As a new type of separation technology, membrane technology is not only widely used in separation fields such as wastewater treatment and heavy metal removal, but also is increasingly used in engineering fields such as seawater desalination. Membrane separation technology has the advantages of high separation efficiency, less secondary pollution, simple separation process, and high economic benefits. This is consistent with my country's current development goal of building a resource-saving society, so it has attracted more and more attention from relevant researchers. [0003] So far, the membrane separation technologies that have been put into industrial application mainly include microfiltration, ult...

Claims

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Application Information

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IPC IPC(8): B01D61/14B01D67/00B01D69/02B01D71/34
CPCB01D61/147B01D67/0079B01D69/02B01D71/34B01D2325/38
Inventor 卢彦越剌玲敏周叶刘楠楠李媚黄增尉柳春
Owner GUANGXI UNIV FOR NATITIES
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