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Polyvinylidene fluoride/nano-silicon oxide hybrid membrane and preparation method thereof

A technology of nano-silica and polyvinylidene fluoride, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of adsorption pollution, shorten the service life of membranes, etc., and achieve enhanced hydrophilicity and good permeability , the effect of a wide range of application prospects

Inactive Publication Date: 2016-12-07
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PVDF has strong hydrophobicity, and in the actual application process, it is easy to generate adsorption pollution on the surface of the membrane and shorten the service life of the membrane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 12wt% of PVDF, 3wt% of porogen PVP K90 and 1wt% of porogen LiCl into a dry three-necked flask, mix the solvent with a mass ratio of NMP:DMAc of 8:2 and pour it into the same three-necked flask. In the three-necked flask, insert the stirring rod into the oil bath and stir, and set the parameter to 45°C, 200r / min. During the stirring process, prepare ethyl orthosilicate (TEOS) with a mass ratio of 17:1 and γ―(2,3-glycidoxy)propyltrimethoxysilane (KH560) and mix uniformly to obtain a mixed solution; The content of TEOS is 1 wt%; the above-mentioned mass percentage is the mass percentage of each raw material in the total mass of all raw materials. Under stirring conditions, slowly drip into the three-necked flask, and then slowly drip 0.1% (accounting for the volume fraction of the mixed solution) prepared 0.15mol / L hydrochloric acid solution. Stir for about 1 hour under this condition to make the polymer swell, then stir at 65°C, 280r / min for 15 hours, take out the po...

Embodiment 2

[0028] Take 14wt% PVDF, 4wt% porogen PVP K90 and 2wt% porogen LiCl into a dry three-necked flask, mix the solvent with a mass ratio of NMP:DMAc of 7:3 and pour it into the same three-necked flask. In the three-necked flask, insert the stirring rod into the oil bath and stir, and set the parameter to 50°C, 200r / min. During the stirring process, prepare ethyl orthosilicate (TEOS) and γ-propyl methacrylate trimethoxysilane (KH570) with a mass ratio of 15:1 to obtain a mixed solution; the content of TEOS is 3wt% ; The above-mentioned mass percentage is the mass percentage of each raw material in the total mass of all raw materials. Under stirring conditions, slowly drop into the three-necked flask, and then slowly drop 0.3% (accounting for the volume fraction of the mixed solution) prepared 0.5mol / L hydrochloric acid solution. Stir for about 1 hour under this condition to make the polymer swell, then stir at 70°C, 280r / min for 18 hours, take out the polymer, stand for 18 hours to ...

Embodiment 3

[0030] Take 16wt% of PVDF, 5wt% of porogen PVP K90 and 3wt% of porogen LiCl into a dry three-necked flask, mix the solvent with a mass ratio of NMP:DMAc of 6:4 and pour it into the same three-necked flask. In the three-necked flask, insert the stirring rod into the oil bath and stir, and set the parameter to 55°C, 200r / min. During the stirring process, prepare ethyl orthosilicate (TEOS) and 3-aminopropyltriethoxysilane (KH550) with a mass ratio of 13:1 and mix uniformly to obtain a mixed solution; wherein the content of TEOS is 5wt%; The mass percentage is the mass percentage of each raw material in the total mass of all raw materials. Under stirring conditions, slowly drip into the three-necked flask, and then slowly drip 0.5% (accounting for the volume fraction of the mixed solution) of 1 mol / L hydrochloric acid solution. Stir for about 1 hour under this condition to swell the polymer, then stir at 75° C., 280 r / min for 21 hours, take out the polymer, stand for 21 hours to d...

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Abstract

The invention relates to a polyvinylidene fluoride / nano-silicon oxide hybrid membrane and a preparation method thereof. The hybrid membrane comprises the following components: polyvinylidene fluoride, a pore-forming agent, tetraethoxysilane (TEOS) and a silane coupling agent. The preparation method comprises the following steps: adding the pore-forming agent into the polyvinylidene fluoride, dissolving in a solvent, stirring at 40 to 60 DEG C to obtain a polyvinylidene fluoride solution; mixing the TEOS and the silane coupling agent, dissolving in a solvent, adding into the polyvinylidene fluoride solution while stirring, dropwise adding hydrochloric acid, further stirring for 12 to 24h at 60 to 80 DEG C, standing, defoaming, scraping a membrane, and curing for 24 to 48h to obtain the polyvinylidene fluoride / nano-silicon oxide hybrid membrane. The preparation method is simple; the prepared hybrid membrane combines advantages in a separation property of an organic membrane and reinforcing and hydrophilic properties of inorganic nanoparticles, has relatively good mechanical properties, separation property and hydrophilic property, and is a separation membrane material with a good prospect.

Description

Technical field [0001] The invention belongs to the field of separation membranes and their preparation, and particularly relates to a polyvinylidene fluoride / nano-silica hybrid membrane and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride (PVDF) is an organic polymer material with excellent performance. It has outstanding chemical and thermal stability. The decomposition temperature of PVDF is above 316℃, and it is not easy to be affected by acids, alkalis, strong oxidants, etc. at room temperature. Corrosion, and organic solvents such as hydrocarbons, alcohols, aldehydes have no effect on it, and it has excellent heat resistance and corrosion resistance. Due to the combination of fluorine-carbon chemical bonds in the chemical structure of PVDF, the molecules are arranged tightly and there are strong hydrogen bonds, which not only have excellent wear resistance and impact resistance, but also have high resistance in harsh environments. UV perf...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/12B01D67/00
CPCB01D67/0081B01D69/12B01D71/34B01D2325/36
Inventor 孙俊芬赵敬楠扶胜娟
Owner DONGHUA UNIV
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