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Preparation method of polyethersulfone polyimide blended ultrafiltration membrane

A technology of polyethersulfone polyimide and polyimide, applied in the field of polyethersulfone membrane and its preparation, to achieve the effect of excellent mechanical and physical and chemical properties

Active Publication Date: 2016-02-10
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Although the polyethersulfone ultrafiltration membrane prepared above reduces the molecular weight cut-off of the polyethersulfone ultrafiltration membrane, it is mainly obtained through more complicated steps such as interfacial polymerization.

Method used

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  • Preparation method of polyethersulfone polyimide blended ultrafiltration membrane
  • Preparation method of polyethersulfone polyimide blended ultrafiltration membrane
  • Preparation method of polyethersulfone polyimide blended ultrafiltration membrane

Examples

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Effect test

example 1

[0042] Add 8.5g of polyethersulfone and 1.5g of polyimide to 55.7g of N,N dimethylformamide, mechanically stir for 6 hours at 20°C, and the stirring speed is 300r / min; then place the solution in Stand at 30°C and defoam for 8 hours to obtain a casting solution with a uniform solid content of 15.2%. Pour the film casting solution on a clean and smooth glass plate, scrape the film with a self-made glass rod of a certain thickness, immerse it in a deionized water coagulation bath with a temperature range of 20°C after natural volatilization for 30 seconds, and wait until the film falls off automatically. Continue to place the membrane in clean deionized water to continue the phase inversion for 24h. A polyethersulfone polyimide blended ultrafiltration membrane with a thickness of 0.15 mm was obtained.

[0043] After testing, the resulting polyethersulfone polyimide blended ultrafiltration membrane has a flux of 432.8L / (m under a pressure of 0.1MPa 2 hbar), the retention rate of...

example 2-3

[0045] Add 8g of polyethersulfone and 2g of polyimide to 55.7g and 40.0g of N,N dimethylformamide, stir mechanically at 30°C for 12h, and the stirring speed is 500r / min; Stand still at 20°C and defoam for 12 hours to prepare casting solutions with uniform solid content of 15.2% and 20%. Pour the film casting solution on a clean and smooth glass plate, scrape the film with a self-made glass rod of a certain thickness, immerse it in a deionized water coagulation bath with a temperature range of 25°C after natural volatilization for 60 seconds, and wait until the film falls off automatically. Continue to place the membrane in clean deionized water to continue the phase inversion for 36h. A polyethersulfone polyimide blended ultrafiltration membrane with a thickness of 0.30 mm was obtained.

[0046]After testing, the solid content of 15.2% and 20% polyethersulfone polyimide blended ultrafiltration membranes have a flux of 90.6L / (m 2 hbar), 55.2L / (m 2 hbar), the retention rates ...

example 4-9

[0049] Add 8.5g of polyethersulfone and 1.5g of polyimide to 38.6g of N,N dimethylacetamide, mechanically stir at 25°C for 10h at a stirring speed of 400r / min; then place the solution in Standing at 25°C for 8 hours of defoaming to obtain a casting solution with a uniform solid content of 20.6%. In order to investigate the influence of volatilization time, pour the casting solution on a clean and smooth glass plate, scrape the film with a self-made glass rod of a certain thickness, and immerse it in the temperature range after natural volatilization for 10s, 20s, 30s, 60s, 90s, and 120s In a deionized water coagulation bath at 30°C, after the membrane falls off automatically, place the membrane in clean deionized water to continue phase inversion for 24 hours. A polyethersulfone polyimide blended ultrafiltration membrane with a thickness of 0.20 mm was obtained. The performance of the obtained polyethersulfone polyimide blended ultrafiltration membrane is as follows: Figure...

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Abstract

The invention relates to a preparation method of a polyether sulfone and polyimide blend ultrafiltration membrane. The method comprises the steps of firstly, dissolving polyimide, polyether sulfone and small molecule organic additives into an organic solvent, mechanically stirring and standing still to obtain a casting membrane solution; pouring the casting membrane solution onto a glass plate and scraping to form a liquid membrane; and carrying out natural volatilization and phase transformation by coagulating bath to obtain the polyether sulfone and polyimide blend ultrafiltration membrane. The polyether sulfone and polyimide blend ultrafiltration membrane is good in mechanical strength and high in pure water flux. After small molecule solvents, such as acetone, which are easily volatile and high in polarity are added, the flux of the membrane is obviously improved under the condition that interception is not reduced, so that the polyether sulfone and polyimide blend ultrafiltration membrane is suitable for interception and recovery of substances with low molecular weight within the ultrafiltration range, and is especially suitable for biological medicines. The preparation method is simple and effective, and is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the field of polyethersulfone membrane and its preparation, in particular to a preparation method of polyethersulfone polyimide blended ultrafiltration membrane. Background technique [0002] Membrane separation technology uses selective permeable membrane as the separation medium. When there is a certain driving force (such as pressure difference, concentration difference, potential difference, etc.) on both sides of the membrane, the components on the raw material side can selectively permeate the membrane, thereby To achieve the purpose of separation and purification. It is different from traditional filtration in that the membrane can separate in the molecular range, and this process is a physical process that does not require phase changes and additives. The thickness of the membrane is generally in the order of microns, and the separation process can be completed in a short time, and the separation effect is good. Compa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D69/08B01D71/68
Inventor 汪勇石林海汪朝晖范益群邢卫红
Owner NANJING TECH UNIV
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