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Method for preparing block copolymer hollow fiber membrane based on selective swelling method

A technology of block copolymers and copolymers, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve problems such as difficult to scale up production, limitations, and poor mechanical properties of hollow fiber membranes, so as to avoid environmental pollution and improve production cost effect

Pending Publication Date: 2020-06-23
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hollow fiber membrane prepared by the NIPS method has poor mechanical properties and is prone to broken filaments during preparation or use.
Moreover, the TIPS method and the NIPS method often use a large amount of organic reagents as diluents or solvents in the preparation process, and the organic reagents need to be recovered, separated and recycled, which can easily cause environmental pollution.
[0004] In patents CN102764600A and CN106674580A, a method for preparing a block copolymer porous membrane by selective swelling is provided. Although this method can prepare a block copolymer membrane with excellent performance, it is difficult to scale up production, and the prepared membrane is Block Copolymer Flat Sheet Membranes, Limitations in Practical Applications

Method used

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  • Method for preparing block copolymer hollow fiber membrane based on selective swelling method
  • Method for preparing block copolymer hollow fiber membrane based on selective swelling method
  • Method for preparing block copolymer hollow fiber membrane based on selective swelling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 20g PSF 75 -PEG 20 The block copolymer is fed into a twin-screw extruder, melted at 170 / 180°C, then extruded through a spinneret with a size of 0.5 / 0.28 / 0.15mm at 170°C, and naturally cooled to obtain a hollow fiber. The obtained hollow fiber was immersed in a mixed solvent of n-propanol and acetone containing 20wt% acetone, and treated in a water bath at 65° C. 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 , image 3 The SEM images of the inner and outer surfaces and cross-section of the polysulfone / polyethylene glycol hollow fiber membrane are respectively. It can be seen from the figure that the inner and outer surfaces of the hollow fiber membrane have a good open-pore structure, and the pore structure runs through the entire membrane layer. The prepared polysulfone / polyethylene glycol hollow fiber membrane has a pure water flux of 65L m- 2 h -1 · b...

Embodiment 2

[0045] 20g PSF 75 -PEG 20 The block copolymer is fed into a twin-screw extruder, melted at 170 / 180°C, then extruded through a spinneret with a size of 0.8 / 0.4 / 0.2mm at 170°C, and naturally cooled to obtain a hollow fiber. The obtained hollow fiber was immersed in a mixed solvent of n-propanol and acetone containing 20wt% acetone, and treated in a water bath at 65° C. for 1 h. Immediately after the treatment, the hollow fiber was taken out and dried at 40° C. to obtain a hollow fiber membrane.

[0046] The prepared polysulfone / polyethylene glycol hollow fiber membrane has a pure water flux of 50L m- 2 h -1 · bar -1 About, bovine serum albumin cut-off rate is about 24%.

Embodiment 3

[0048] 20g PSF 75 -PEG 20 The block copolymer is fed into a twin-screw extruder, melted at 170 / 180°C, then extruded through a spinneret with a size of 1.4 / 0.9 / 0.6mm at 170°C, and naturally cooled to obtain a hollow fiber. The obtained hollow fiber was immersed in a mixed solvent of n-propanol and acetone containing 20wt% acetone, and treated in a water bath at 65° C. for 1 h. Immediately after the treatment, the hollow fiber was taken out and dried at 40° C. to obtain a hollow fiber membrane.

[0049] The prepared polysulfone / polyethylene glycol hollow fiber membrane has a pure water flux of 40L m- 2 h -1 · bar -1 About, bovine serum albumin cut-off rate is about 21%.

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Abstract

The invention provides a method for preparing a block copolymer hollow fiber membrane based on selective swelling, which comprises the following steps: by using an amphiphilic block copolymer as a membrane forming material, carrying out melt spinning to prepare compact hollow fibers; immersing the obtained hollow fiber in a swelling agent, and treating for 0-5h under 55-70 DEG C water bath heating; and immediately taking out and drying after the treatment is finished to obtain the hollow fiber membrane with a bicontinuous open pore structure. According to the method, melt spinning and selective swelling are combined, the hollow fiber membrane can be prepared only by using a small amount of the solvent, and the solvent can be repeatedly used, so that the influence on the environment is reduced; the method has universality and can be widely applied to the process of preparing the hollow fiber membrane from various segmented copolymers; and the prepared hollow fiber membrane can be storedin a dry state, so that the storage and transportation cost is reduced.

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). The MSCS method is to melt the polymer material at high temperature and then extrude it under high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D69/02B01D71/80B01D67/00A61M1/18
CPCB01D69/08B01D69/02B01D71/80B01D67/0002A61M1/1623B01D2325/36
Inventor 汪勇钟丁磊周洁梅
Owner NANJING TECH UNIV
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