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A kind of preparation method of stable high flux ultrafiltration membrane

An ultrafiltration membrane with high stability technology, applied in the field of stable high-flux ultrafiltration membrane preparation, can solve the problems of enrichment of hydrophobic segments, adverse effects of modification effect, etc., and achieve stable high flux and good separation performance Effect

Active Publication Date: 2019-12-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] At present, the surface segregation adopts the method of low hydrophilic-hydrophobic segment ratio to control the surface segregation, and suppress the loss of the surface segregation agent in the non-solvent bath during the non-solvent-induced phase inversion process, but this method also leads to more hydrophobic segments. The enrichment on the surface of the membrane has an adverse effect on the modification effect

Method used

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  • A kind of preparation method of stable high flux ultrafiltration membrane
  • A kind of preparation method of stable high flux ultrafiltration membrane
  • A kind of preparation method of stable high flux ultrafiltration membrane

Examples

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Effect test

Embodiment 1

[0017] Embodiment 1, prepare stable high flux ultrafiltration membrane, the steps are as follows:

[0018] Step 1, preparation of modifier precursor: dissolve maleic anhydride and N-vinylpyrrolidone in a certain amount of N,N-dimethylformamide, use azobisisobutyronitrile as the initiator, at 70 Under ℃, carry out free radical alternating copolymerization for 3 hours, then add styrene to continue polymerization for 3 hours, and finally obtain the structure of poly(N-vinylpyrrolidone-alt-maleic anhydride)-b-polystyrene-like block copolymer (maleic anhydride) The feeding ratio of acid anhydride, N-vinylpyrrolidone and styrene is 1:1:4);

[0019] Step 2. In-situ synthesis of modifier and preparation of stable high-flux ultrafiltration membrane: 100 mg of modifier precursor prepared in step 1, 600 mg of polyethylene glycol 2000, 1600 mg of polyethersulfone and N,N- 7700 mg of dimethylformamide (mass ratio 1:6:16:77) was mixed into a homogeneous solution, stirred at 60°C for 12 hou...

Embodiment 2

[0021] Example 2, the preparation of a stable high-flux ultrafiltration membrane, the preparation process is basically the same as in Example 1, the only difference is that in step 2, the modifier precursor, polyethylene glycol 2000, polyethersulfone and N,N -The mass ratio of dimethylformamide was changed to 1.5:6:16:76.5 to finally obtain a stable high-flux ultrafiltration membrane 2.

[0022] The stable high flux ultrafiltration membrane 2 that embodiment 2 makes is 289Lm in pure water specific flux -2 h -1 bar -1 , the rejection rate of 1g / L bovine serum albumin aqueous solution is 97%, and the flux recovery rates of three cycles are 79.1%, 93.0% and 96.7% respectively.

Embodiment 3

[0023] Example 3, the preparation of a stable high-flux ultrafiltration membrane, the preparation process is basically the same as in Example 1, the only difference is that in step 2, the modifier precursor, polyethylene glycol 2000, polyethersulfone and N,N -The mass ratio of dimethylformamide was changed to 2:6:16:76 to finally obtain a stable high-flux ultrafiltration membrane 3.

[0024] The stable high flux ultrafiltration membrane 3 that embodiment 3 makes is 316Lm in pure water specific flux -2 h -1 bar -1 , the rejection rate of 1g / L bovine serum albumin aqueous solution is 97%, and the flux recovery rates of three cycles are 75.0%, 98.2% and 100.0% respectively. figure 2 The three-cycle flux change diagram for the stable high-flux ultrafiltration membrane 3 filtering 1g / L bovine serum protein solution.

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Abstract

The invention discloses a method for preparing a stable high-throughput ultrafiltration membrane. The method comprises preparing a modifier precursor poly(N-vinylpyrrolidone-alt-maleic anhydride)-b-polystyrene by a radical polymerization method, dissolving the modifier precursor, polyethylene glycol 2000 and polyethersulfone in N, N-dimethylformamide to obtain a casting liquid, carrying out stirring and heating so that the modifier having a crosslinked structure is formed in situ by the acid anhydride alcoholysis reaction, and preparing the stable high-throughput ultrafiltration membrane through a non-solvent induced phase inversion method. The method can adjust a crosslinking degree of the modifier produced in situ through change of a use ratio of the modifier precursor to polyethylene glycol 2000 so that the composition structure and performances of the ultrafiltration membrane can be adjusted and controlled and stability, high throughput and good separation performances are realized.

Description

technical field [0001] The invention relates to a method for preparing a stable high-flux ultrafiltration membrane, and belongs to the technical field of ultrafiltration membrane preparation. Background technique [0002] Membrane separation is a high-tech covering chemical engineering, material science, process engineering and other disciplines. It is a selective separation medium for a certain component in the mixture. A certain driving force is applied on both sides of the membrane to make the mixture Components are selectively transferred from one side of the membrane to the other. Ultrafiltration membrane is one of the membrane separation technologies that use pressure as the driving force to separate macromolecules and small molecules. As a new separation technology, ultrafiltration membrane can effectively intercept suspended particles, colloids, macromolecules, algae and bacteria, etc., so it has been applied in many aspects. Seawater desalination pretreatment is o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/14B01D67/00
CPCB01D61/145B01D67/0002
Inventor 姜忠义贺明睿张润楠刘亚楠
Owner TIANJIN UNIV