PEO-b-PMMA modified PVDF ultrafiltration membrane and preparation process thereof

An ultrafiltration membrane, peo-b-pmma technology, applied in the field of block copolymer PEO-b-PMMA modified polyvinylidene fluoride ultrafiltration membrane and its preparation, to achieve good thermal stability, continuous and convenient operation, durable The effect of corrosion interaction

Inactive Publication Date: 2015-03-25
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is a preparation method of block copolymer PEO-b-PMMA modified polyvinylidene fluoride (PVDF) ultrafiltration membrane, which adopts adding block

Method used

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  • PEO-b-PMMA modified PVDF ultrafiltration membrane and preparation process thereof
  • PEO-b-PMMA modified PVDF ultrafiltration membrane and preparation process thereof
  • PEO-b-PMMA modified PVDF ultrafiltration membrane and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh 2.5g of PEO-Br, 0.05g of CuCl, 0.22g of PMDETA, 10ml of MMA and 20ml of THF into a 150ml Erlenmeyer flask, and bubble with nitrogen for 30 minutes to remove the air. Then seal it and put it in an oil bath at 60°C and stir for 5h. Cool to room temperature after stirring, add 50mlTHF to dissolve the product, and the solution passes through Al 2 o 3 column to remove Cu ligands. 200ml of glacial ether was poured into the filtrate to obtain a precipitate. The product was filtered with a water pump and then dried in a vacuum oven at 40°C. This is the surfactant PEO-b-PMMA.

Embodiment 2

[0035] Weigh 4g of PVDF, 0.3g of PVP, 0.2g of PEO-b-PMMA, 16.4ml of DMF in a conical flask, fully stir at 60°C for 7 hours to dissolve completely; Push it into a liquid film with a certain thickness with a film scraper, let it stand in the air for 15-20 seconds, and then immerse it together with the glass plate in a coagulation bath at 22°C. After the ultrafiltration membrane automatically falls off from the scraper plate, put the ultrafiltration The membrane is removed from it, immersed in distilled water, and cut to size for testing.

Embodiment 3

[0037] Weigh 4gPVDF, 0.3gPVP, 0.4gPEO-b-PMMA, 16.2mlDMF in a Erlenmeyer flask, stir thoroughly at 60°C for 7 hours to dissolve completely; Push it into a liquid film with a certain thickness with a film scraper, let it stand in the air for 15-20 seconds, and then immerse it together with the glass plate in a coagulation bath at 22°C. After the ultrafiltration membrane automatically falls off from the scraper plate, put the ultrafiltration The membrane is removed from it, immersed in distilled water, and cut to size for testing.

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Abstract

The invention discloses a process for preparing a segmented copolymer PEO-b-PMMA modified ultrafiltration membrane. The process comprises the following steps: preparing 1-3 mass percent of segmented copolymer, 20 mass percent of PVDF, 1.5 mass percent of a pore-foaming agent, 75.5-77.5 mass percent of a solvent into a membrane forming solution, heating and mixing the membrane forming solution for 7 hours, then statically defoaming for one night, making membranes, immersing in distilled water and cutting according to required sizes. According to the process, the segmented copolymer PEO-b-PMMA is added on the surface of the PVDF ultrafiltration membrane, so that the hydrophilicity of the PVDF ultrafiltration membrane is effectively improved, the anti-pollution performance of the membrane is enhanced, and the technical problems of fast flux decline and short service life of the conventional ultrafiltration membrane are solved.

Description

technical field [0001] The invention relates to the technical field of membrane separation, and relates to a block copolymer PEO-b-PMMA modified polyvinylidene fluoride (PVDF) ultrafiltration membrane and a preparation method thereof. Background technique [0002] With the continuous development of ultrafiltration membrane technology, there are various requirements for ultrafiltration membranes. Due to the low flux, low porosity, short service life and serious membrane pollution of ultrafiltration membranes, it is necessary to solve the pollution problem on the membrane surface. become more and more urgent. The modification of ultrafiltration membrane, especially the introduction of hydrophilic groups on the membrane surface is the key to solve the problem. In the research on the fouling of ultrafiltration membranes, it is found that improving the hydrophilicity of the membrane surface is conducive to improving the anti-fouling performance of the membrane. With the continu...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/02B01D67/00
Inventor 王连军李健生舒舟李阳孙秀云沈锦优韩卫清
Owner NANJING UNIV OF SCI & TECH
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