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Polysulfone blend membrane with low block copolymer content and preparation method thereof

A technology of block copolymer and blend membrane, which is applied in separation methods, chemical instruments and methods, membrane technology, etc., can solve the problems of increasing membrane production cost and high synthesis cost, and achieves reduction of preparation cost, optimization of stirring speed, increase of The effect of the anchor effect

Active Publication Date: 2022-05-31
泰州南潇新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the prior art, the addition amount of the front-end copolymer is more than 1wt%, and the normal content is about 3-5%, which can maintain a high hydrophilic property. However, the synthesis cost of the block copolymer is relatively high, so that The hydrophilicity of the membrane is improved, but it will inevitably significantly increase the production cost of the membrane, thus limiting the application of block copolymer blended polysulfone membranes in actual production

Method used

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  • Polysulfone blend membrane with low block copolymer content and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] This embodiment adopts the following steps to prepare polysulfone ultrafiltration membrane:

[0027] (a) 10g of polysulfone, 0.05g of PSf-b-PEG block copolymer (the ratio of its PSF segment to PEG segment is 4:1), and 2g of PEG with a molecular weight of 4000 were dissolved in 50g of dimethyl ether in turn A mixed solution was formed in the base formamide, and the thermal cross-linking was stirred at a cross-linking temperature of 100 °C for 2 h, and the stirring speed was 50 r / min;

[0028] (b) cooling the mixed solution to room temperature, adding 4 g of PEG with a molecular weight of 1000 to the mixed solution, stirring evenly, standing, and defoaming to form a casting solution;

[0029] (c) Scrape the casting liquid evenly on a glass plate to form a certain thickness, and place it in a 60°C coagulation bath that is mixed with dimethylformamide and water in a volume of 3:7 for phase conversion, and then take out and soak in In deionized water for 0.5 h, and then dri...

Embodiment 2

[0031] This example uses the following steps to prepare a polysulfone membrane:

[0032] (a) 10 g of polysulfone, 0.05 g of PSf-b-PEG block copolymer (the ratio of its PSF segment to PEG segment is 2:1), and 2 g of PEG with a molecular weight of 4000 were dissolved in 50 g of dimethyl ether in turn. A mixed solution was formed in the base formamide, and the thermal cross-linking was stirred at a cross-linking temperature of 100 °C for 2 h, and the stirring speed was 50 r / min;

[0033] (b) cooling the mixed solution to room temperature, adding 4 g of PEG with a molecular weight of 1000 to the mixed solution, stirring evenly, standing, and defoaming to form a casting solution;

[0034] (c) Scrape the casting liquid evenly on a glass plate to form a certain thickness, and place it in a 60°C coagulation bath that is mixed with dimethylformamide and water in a volume of 3:7 for phase conversion, and then take out and soak in In deionized water for 0.5 h, and then dried in an oven ...

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Abstract

According to the invention, low-content PSf-b-PEG is adopted as an amphiphilic block copolymer, and high-content low-molecular PEG is blended with a polysulfone film forming material, and a PEG chain segment in the PSf-b-PEG is thermally crosslinked with the low-molecular-weight PEG by thermal crosslinking, so that the high hydrophilicity of the polysulfone blended film is improved, and the preparation cost of the film is reduced. The uncrosslinked low-molecular-weight PGE and the subsequently added high-molecular-weight PEG are used as pore-foaming agents, and the porosity of the membrane can be regulated and controlled by regulating and controlling the amount of the high-molecular-weight PEG.

Description

technical field [0001] The present invention relates to a polymer membrane material, in particular to a polysulfone blend membrane material with low block copolymer content and high hydrophilicity. Background technique [0002] Membrane separation technology is a new and efficient separation technology, which has the advantages of energy saving, environmental friendliness and high separation efficiency. It is widely used in water treatment, biomedicine, medical treatment, air separation and other fields. For membrane separation technology, membrane material is the core of membrane technology, which directly affects the physicochemical stability and separation performance of the membrane. [0003] Among the many membrane materials, polysulfone is a kind of thermoplastic resin containing aromatic rings and sulfone groups on the main chain of the molecule. Sulfone etc. Compared with other membrane materials, polysulfone has excellent chemical stability, thermal stability and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D71/68C02F1/44B01D53/22B01D46/54
CPCB01D67/0002B01D67/0011B01D71/68C02F1/44B01D46/543B01D53/228Y02A20/131
Inventor 闻海萌李胜兰徐业龙周兰凤
Owner 泰州南潇新材料科技有限公司
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