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Method for preparing block copolymer hollow fiber membrane by combining selective swelling and melt spinning stretching processes

A technology of melt-spinning stretching and copolymer, which is applied in the field of block copolymer hollow fiber membrane preparation based on selective swelling method, can solve the problems such as the decline of interception performance, the decline of interception performance of hollow fiber membrane, and the impact on the application of hollow fiber membrane. Achieve the effect of improving performance and avoiding the appearance of dense layer

Active Publication Date: 2021-06-29
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for the above method, only the flux performance of the stretched hollow fiber membrane is improved, and the corresponding interception performance will be significantly reduced, showing a typical trade-off effect
At the same time, with the increase of the stretching ratio of the hollow fiber membrane, the interception performance of the hollow fiber membrane decreases more seriously, which ultimately affects the application of the hollow fiber membrane.

Method used

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  • Method for preparing block copolymer hollow fiber membrane by combining selective swelling and melt spinning stretching processes
  • Method for preparing block copolymer hollow fiber membrane by combining selective swelling and melt spinning stretching processes
  • Method for preparing block copolymer hollow fiber membrane by combining selective swelling and melt spinning stretching processes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 20g PSF 75 -PEG 20 The block copolymer is added into a twin-screw extruder, melted under the condition of nitrogen protection at 200 / 210°C, and then extruded through a spinneret at 200°C, and the stretching rate is adjusted to 260mm / min under water cooling to obtain a drawn Hollow fiber with a stretch ratio of 247%. The obtained hollow fiber was immersed in a mixed solvent of n-propanol and acetone containing 20wt% acetone, treated in a water bath at 65° C. for 1 h, and then transferred to n-octane for 12 h. Immediately after the treatment, the hollow fiber was taken out and dried at 40° C. to obtain a hollow fiber membrane.

[0037] The pure water flux of the polysulfone / polyethylene glycol hollow fiber membrane prepared in this example is 84L m -2 h -1 · bar -1 About 60% of bovine serum albumin with a diameter of about 6nm is rejected.

Embodiment 2

[0039] 20g PSF 75 -PEG 20 The block copolymer was added into a twin-screw extruder, melted under nitrogen protection conditions at 200 / 210°C, and then extruded through a spinneret at 200°C, and the stretching rate was adjusted to 360mm / min under natural cooling to obtain Hollow fiber with a draw ratio of 380%. The obtained hollow fiber was immersed in a mixed solvent of n-propanol and acetone containing 20wt% acetone, treated in a water bath at 65° C. for 1 h, and then transferred to n-heptane for 6 h. Immediately after the treatment, the hollow fiber was taken out and dried at 40° C. to obtain a hollow fiber membrane.

[0040] The pure water flux of the polysulfone / polyethylene glycol hollow fiber membrane prepared in this example is 89L m -2h -1 · bar -1 About 68% of bovine serum albumin with a diameter of about 6nm is rejected.

Embodiment 3

[0042] 20g PSF 75 -PEG 20 The block copolymer was added into a twin-screw extruder, melted under nitrogen protection at 200 / 210°C, and then extruded through a spinneret at 200°C, and the stretching rate was adjusted to 470mm / min under natural cooling to obtain A hollow fiber with a draw ratio of 527%. The obtained hollow fiber was immersed in a mixed solvent of n-propanol and acetone containing 20 wt% acetone, treated in a water bath at 65° C. for 1 h, and then transferred to n-heptane for 1 h. Immediately after the treatment, the hollow fiber was taken out and dried at 40° C. to obtain a hollow fiber membrane.

[0043] figure 1 , figure 2 The SEM images of the outer surface and section of the polysulfone / polyethylene glycol hollow fiber membrane prepared in this example are respectively. It can be seen from the figure that the polysulfone / polyethylene glycol hollow fiber membrane after high-speed stretching has a good open-pore structure, and the channels have obvious t...

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Abstract

The invention provides a method for preparing a block copolymer hollow fiber membrane by combining selective swelling and melt spinning stretching processes. The method comprises the following steps of: preparing primary hollow fibers by using an amphiphilic block copolymer as a membrane forming material through melt spinning under the protection of inert gas, and carrying out stretching treatment on the primary hollow fibers in the cooling process of the primary hollow fibers, wherein a stretching rate is controlled to be in a range of 200 mm / min to 540 mm / min, and a stretching ratio is controlled to be in a range of 150% and 600%; immersing the obtained hollow fibers in a swelling agent, and conducting treatment for 1 hour under heating in a water bath with a temperature of 65 DEG C; and then transferring the hollow fibers into a long-chain alkane solvent with the same temperature, conducting treatment for 1-12 hours, immediately taking out the hollow fibers after the treatment is finished, and conducting drying to obtain the hollow fiber membrane with a bicontinuous open pore structure. According to the method disclosed by the invention, the permeability and selectivity of the hollow fiber membrane can be synchronously and continuously improved by combining melt spinning stretching and selective swelling; and meanwhile, polar chain segments which are excessively enriched on the surface of the membrane can be migrated inwards through treatment of the long-chain alkane solvent, so the performance of the hollow fiber membrane is improved.

Description

technical field [0001] The invention belongs to the technical field of porous material separation membranes, and in particular relates to a method for preparing block copolymer hollow fiber membranes based on a selective swelling method. Background technique [0002] Hollow fiber membrane is a kind of membrane material with fiber shape and self-supporting function. Because the hollow fiber membrane itself has the advantages of high packing density per unit volume, simple operation, and stable structure, it is widely used in water treatment, catalytic reaction, food processing, biotechnology, and medical technology. [0003] At this stage, there are mainly three methods for preparing hollow fiber membranes using polymer materials, namely: melt spinning-drawing method (MSCS), thermally induced phase separation method (TIPS) and non-solvent induced phase separation method (NIPS). In order to improve the performance of the prepared hollow fiber membranes, the nascent hollow fib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/08B01D71/80
CPCB01D67/0002B01D69/08B01D71/80B01D71/52B01D67/0016B01D2323/08B01D69/087D01D5/08D01D5/24D01F6/78B01D71/68B01D71/5211B01D67/0086B01D67/0088B01D67/0027B01D2323/219B01D67/002D01F1/08
Inventor 汪勇钟丁磊周洁梅
Owner NANJING UNIV OF TECH
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