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A kind of preparation method of mixed matrix flat film of mof particle modification nanotube filling silicone rubber

A mixed matrix, flat membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of reducing membrane selectivity, MMMs difficult to maintain high mechanical properties and high selectivity, uneven dispersion, etc. problems, to achieve the effect of improving separation capacity and efficiency, improving osmotic separation performance, and improving osmotic separation performance

Active Publication Date: 2021-08-27
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the dispersibility content is too high, it is difficult for MMMs to maintain high mechanical and high selectivity
Mainly because of the non-ideal effects caused by the incompatibility between fillers and polymers, that is, interfacial voids, particles blocking pores, etc.
And due to the agglomeration of fillers caused by strong surface tension and high surface energy, it leads to uneven dispersion in the polymer matrix
The generation of these phenomena makes the diffusion of liquid molecules in the membrane tend to bypass the dispersed phase, greatly reducing the selectivity of the membrane.

Method used

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  • A kind of preparation method of mixed matrix flat film of mof particle modification nanotube filling silicone rubber
  • A kind of preparation method of mixed matrix flat film of mof particle modification nanotube filling silicone rubber
  • A kind of preparation method of mixed matrix flat film of mof particle modification nanotube filling silicone rubber

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing a MOF particle-modified nanotube filled silicone rubber mixed matrix flat film, the specific preparation steps are as follows:

[0026] 1) Add 5 g of halloysite nanotubes into a mixed solution of 180 ml of tetrahydrofuran and 40 ml of water to obtain dispersion 1.

[0027] 2) Add 2.5 g of dopamine to the dispersion 1 obtained in step 1 to obtain a suspension 2.

[0028] 3) The suspension 2 obtained in step 2 was continuously stirred for 48 hours, and vacuumized at room temperature. Centrifuge, wash the precipitate with THF and water for 4 times, and then dry the precipitate at 60°C under vacuum for 8h to constant weight to obtain dopamine-modified halloysite nanotubes (DHNTs);

[0029] 4) Disperse 0.5g of DHNTs obtained in step 3 in 15ml of 0.05mol / ml Zn(NO 3 ) 2 ·6H 2 O methanol solution for 10 minutes to obtain dispersion 2. Then the dispersion 2 was poured into 15 ml of 0.4 mol / L 2-methylimidazole methanol solution to react for 10 minutes....

Embodiment 2

[0035] A method for preparing a MOF particle-modified nanotube filled silicone rubber mixed matrix flat film, the specific preparation steps are as follows:

[0036] 1) Add 5 g of halloysite nanotubes into a mixed solution of 180 ml of tetrahydrofuran and 40 ml of water to obtain dispersion 1.

[0037] 2) Add 2.5 g of dopamine to the dispersion 1 obtained in step 1 to obtain a suspension 2.

[0038] 3) The suspension 2 obtained in step 2 was continuously stirred for 48 hours, and vacuumized at room temperature. Centrifuge, wash the precipitate with THF and water for 4 times, and then dry the precipitate at 60°C under vacuum for 8h to constant weight to obtain dopamine-modified halloysite nanotubes (DHNTs);

[0039] 4) Disperse 0.5g of DHNTs obtained in step 3 in 15ml of 0.05mol / ml Zn(NO 3 ) 2 ·6H 2 O methanol solution for 10 minutes to obtain dispersion 2. Then the dispersion 2 was poured into 15 ml of 0.4 mol / L 2-methylimidazole methanol solution to react for 10 minutes....

Embodiment 3

[0045] A method for preparing a MOF particle-modified nanotube filled silicone rubber mixed matrix flat film, the specific preparation steps are as follows:

[0046] 1) Add 5 g of halloysite nanotubes into a mixed solution of 180 ml of tetrahydrofuran and 40 ml of water to obtain dispersion 1.

[0047] 2) Add 2.5 g of dopamine to the dispersion 1 obtained in step 1 to obtain a suspension 2.

[0048] 3) The suspension 2 obtained in step 2 was continuously stirred for 48 hours, and vacuumized at room temperature. Centrifuge, wash the precipitate with THF and water for 4 times, and then dry the precipitate at 60°C under vacuum for 8h to constant weight to obtain dopamine-modified halloysite nanotubes (DHNTs);

[0049] 4) Disperse 0.5g of DHNTs obtained in step 3 in 15ml of 0.05mol / ml Zn(NO 3 ) 2 ·6H 2 O methanol solution for 10 minutes to obtain dispersion 2. Then the dispersion 2 was poured into 15 ml of 0.4 mol / L 2-methylimidazole methanol solution to react for 10 minutes....

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Abstract

The invention relates to a preparation method of a mixed matrix flat membrane filled with silicone rubber modified by MOF particles and belongs to the technical field of pervaporation membrane separation. In the preparation method of the mixed matrix membrane of the present invention, firstly, dopamine is coated on the outer surface and ports of the halloysite nanotubes to obtain dopamine-coated halloysite nanotubes; then the dopamine-coated halloysite nanotubes are sequentially dispersed In Zn(NO 3 ) 2 ·6H 2 O / methanol solution and 2-methylimidazole / methanol solution, and repeat the dispersion operation for 1 to 10 times, and obtain ZIF-8 modified halloysite nanotubes after drying; finally, add the modified halloysite nanotubes to the PDMS solution Add catalyst TEOS and cross-linking agent DBTDL in sequence, and obtain casting liquid after cross-linking. Casting liquid is cast on polymer flat ultrafiltration membrane or microfiltration membrane. After drying and cross-linking, an inorganic nanoparticle Novel mixed-matrix flat-sheet membranes of modified silicone rubber.

Description

technical field [0001] The invention relates to a method for preparing a mixed-matrix flat membrane filled with silicone rubber modified by MOF particles and belongs to the technical field of pervaporation membrane separation. Background technique [0002] At present, with the shortage of energy and the deterioration of the environment, people's demand for clean and sustainable energy continues to increase. Biofuels (ethanol, butanol, acetone, etc.) are renewable fuels, mainly obtained through the fermentation of renewable biomass. In order to reduce product inhibition and increase conversion, it is particularly important to separate fermentation products from fermentation broth. Taking the production of bioethanol as an example, the traditional fermentation process often uses batch fermentation. The ethanol yield of this process is very low and the quality cannot be guaranteed. Membrane separation technology has the advantages of strong selectivity, high separation effici...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/36B01D69/06B01D67/00
CPCB01D61/362B01D67/0079B01D69/06
Inventor 赵之平毛恒徐李昊王涛
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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