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Segmented polymer FPEG-CO-CA modified CA filter membrane and preparation method thereof

A FPEG-CO-CA, block polymer technology, applied in chemical instruments and methods, membrane, membrane technology and other directions, can solve the complex method of synthesizing modified CA filter membrane, the metal salt catalyst is not easy to remove, and the CA filter membrane is hydrophobic It has the advantages of excellent oil resistance and anti-pollution ability, wide application range, enhanced hydrophilicity and oleophobicity, etc.

Active Publication Date: 2018-09-14
SUZHOU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of the above-mentioned shortcoming of prior art, the purpose of the present invention is to provide a kind of simple and easy method, to solve the strong hydrophobicity of conventional CA filter membrane (comprising flat membrane and hollow fiber membrane), water flux is low, in separation process Susceptible to the problem of irreversible pollution by organic substances such as protein and oil
[0011] Another purpose of the present invention is to solve the technical problems of cumbersome, high cost and high operation requirements in the prior art for synthesizing modified CA filter membranes, and the technical problems that metal salt catalysts are not easy to remove and not easy to industrialize in some reactions

Method used

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  • Segmented polymer FPEG-CO-CA modified CA filter membrane and preparation method thereof
  • Segmented polymer FPEG-CO-CA modified CA filter membrane and preparation method thereof
  • Segmented polymer FPEG-CO-CA modified CA filter membrane and preparation method thereof

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Embodiment 1

[0044] The block polymer FPEG-CO-CA modified CA filter membrane is prepared by the following steps:

[0045] 1) Perfluoroalkyl-polyethylene glycol (FPEG) is oxidized with 2,2,6,6-tetramethylpiperidine nitrogen oxide (TEMPO) to obtain perfluoroalkyl-polyethylene glycol carboxylic acid (FPEG-COOH);

[0046] 2) Esterification of cellulose acetate (CA) with perfluoroalkyl-polyethylene glycol carboxylic acid (FPEG-COOH) to synthesize block polymer FPEG-CO-CA;

[0047] 3) The cellulose acetate (CA) with a mass ratio of 7:3 and the block polymer FPEG-CO-CA were respectively placed in a vacuum drying oven at 60°C for 12 hours, and the solvent N,N-di Methylacetamide (DMAc) was used for drying; the dried CA and FPEG-CO-CA were dissolved in the dried DMAc in a certain proportion, and mechanically stirred at a speed of 200r / min at a temperature of 40°C for 12-36h , forming a casting solution; the molecular weight of cellulose acetate (CA) is about 30000, wherein the acetyl group content...

Embodiment 2

[0051] The block polymer FPEG-CO-CA modified CA filter membrane is prepared by the following steps:

[0052] 1) Perfluoroalkyl-polyethylene glycol (FPEG) is oxidized with 2,2,6,6-tetramethylpiperidine nitrogen oxide (TEMPO) to obtain perfluoroalkyl-polyethylene glycol carboxylic acid (FPEG-COOH);

[0053] 2) Esterification of cellulose acetate (CA) with perfluoroalkyl-polyethylene glycol carboxylic acid (FPEG-COOH) to synthesize block polymer FPEG-CO-CA;

[0054] 3) The cellulose acetate (CA) with a mass ratio of 9:1 and the block polymer FPEG-CO-CA were respectively placed in a vacuum drying oven at 60°C for 36 hours, and the solvent N,N-di Methylacetamide (DMAc) was used for drying; the dried CA and FPEG-CO-CA were dissolved in the dried DMAc in a certain proportion, and mechanically stirred at a speed of 500r / min for 36h at a temperature of 80°C to form Casting solution; the molecular weight of cellulose acetate (CA) is about 50000, wherein the acetyl content is 40wt%, an...

Embodiment 3

[0058] The block polymer FPEG-CO-CA modified CA filter membrane is prepared by the following steps:

[0059] 1) Perfluoroalkyl-polyethylene glycol (FPEG) is oxidized with 2,2,6,6-tetramethylpiperidine nitrogen oxide (TEMPO) to obtain perfluoroalkyl-polyethylene glycol carboxylic acid (FPEG-COOH);

[0060] 2) Esterification of cellulose acetate (CA) with perfluoroalkyl-polyethylene glycol carboxylic acid (FPEG-COOH) to synthesize block polymer FPEG-CO-CA;

[0061] 3) The cellulose acetate (CA) with a mass ratio of 5:1 and the block polymer FPEG-CO-CA were respectively placed in a vacuum drying oven at 60°C for 50 h, and the solvent N,N-di Methylacetamide (DMAc) was used for drying; the dried CA and FPEG-CO-CA were dissolved in the dried DMAc in a certain proportion, and mechanically stirred at a speed of 380r / min for 25h at a temperature of 60°C to form Casting liquid; the molecular weight of cellulose acetate (CA) is about 40000, wherein the content of acetyl group is 39wt%,...

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Abstract

The invention provides a preparation method of a segmented polymer FPEG-CO-CA modified CA filter membrane. The preparation method includes: adopting segmented polymer FPEG-CO-CA as an additive to modify CA; allowing membrane formation to obtain the filter membrane, wherein FPEG-CO-CA segmented polymer obtained through simple free radical polymerization and normal-temperature esterification reaction is used as the additive for modifying a CA membrane. Compared with the prior art for preparing the segmented polymer additive, the method has the advantages of few needed operation steps, simplicityand convenience in operation, low in cost and easiness for industrial production; the segmented polymer FPEG-CO-CA and CA are blended to prepare a modified filter membrane, and the filter membrane can be prepared by adopting a conventional immersion precipitation phase conversion process. The preparation process is simple, low in requirement on modifying conditions and easy in control, and the membrane is adjustable and uniform in structure and has lasting stability. The novel segmented polymer modified CA separation membrane is simple in operation and wider in application range.

Description

technical field [0001] The invention relates to the technical field of polymer design and synthesis and membrane separation, in particular to a block polymer FPEG-CO-CA modified CA filter membrane and a preparation method thereof. Background technique [0002] As a new type of technology, membrane separation technology is widely used in medical treatment, energy, Electronics and other fields have also been applied to various practical projects of wastewater treatment, and the biggest obstacle to the application of membrane technology in wastewater treatment is the problem of membrane self-pollution. Cellulose acetate (CA) has been regarded as the oldest and widely used film-making material because of its good film-forming performance, simple preparation process, low price, and environmental friendliness. However, CA film is easy to be polluted, not resistant to microbial corrosion, Disadvantages such as being easily oxidized limit its further extensive application in the fi...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L1/12C08L87/00C08G81/00B01D67/00B01D69/08B01D69/12B01D71/16
CPCB01D67/0011B01D69/08B01D69/125B01D71/16B01D2325/30C08G81/00C08J5/18C08J2301/12C08J2487/00
Inventor 白仁碧沈舒苏王瑞华张干伟周晓吉纪炜
Owner SUZHOU UNIV OF SCI & TECH
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