Amphiphilic terpolymer modified ultra-filtration membrane preparation method

A terpolymer and amphiphilic technology, which is applied in the field of membrane separation, can solve the problems of complex chemical graft modification process, decreased hydrophilicity of separation membrane, and unsuitability for industrial production, etc., and achieve high protein retention rate and Anti-pollution ability, avoiding the problem of phase separation, and strong practicability

Active Publication Date: 2020-01-14
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanoparticles are easy to aggregate in the casting solution, have poor miscibility with hydrophobic polymers, and are easy to precipitate during use, resulting in a decrease in the hydrophilicity of the separation membrane.
Surface coating and surface grafting of hydrophilic polymers are two other commonly used modification methods, but the hydrophilic polymer in the coating method is adsorbed on the polymer surface by physical action, and the antifouling coating is easy to fall off
The chemical grafting modification method has a complicated process and is not suitable for industrial production

Method used

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  • Amphiphilic terpolymer modified ultra-filtration membrane preparation method
  • Amphiphilic terpolymer modified ultra-filtration membrane preparation method
  • Amphiphilic terpolymer modified ultra-filtration membrane preparation method

Examples

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Effect test

Embodiment 1

[0031] This embodiment includes the preparation of polyaryletherketone ultrafiltration membrane;

[0032] 1.5 g of polyarylether ketone was added to the solution containing 8.5 g of NMP, and stirred at 60° C. for 24 hours; then, it was left standing at a constant temperature of 60° C. for 24 hours to obtain a casting solution. Pour the prepared film casting liquid on a clean glass plate and scrape the film; stagnate the liquid film obtained after scraping in the air for 30s, put it into an ultrapure water coagulation bath at 16°C to solidify to form a film; finally The ultrafiltration membrane detached from the glass plate was soaked in ultrapure water for 24 hours to eliminate the residual NMP solvent in the membrane to obtain a polyaryletherketone ultrafiltration membrane.

Embodiment 2

[0034] This embodiment combines the preparation of the amphiphilic terpolymer and the preparation of the amphiphilic terpolymer modified ultrafiltration membrane, including the following steps:

[0035] Step 1, the preparation of amphiphilic terpolymer: first, under nitrogen protection, 1.5g dimethylaminoethyl methacrylate (DMAEMA), 2.2g methacryloyl ethyl sulfobetaine (SBMA), Dissolve 1.4g of vinylpyrrolidone (VP) and 0.5g of AIBN in 100ml of THF-ethanol mixture A with a volume ratio of 5:1, stir and react for 24 hours to obtain a mixed system, pour the mixed system into deionized water, and precipitate Finally, the precipitate was vacuum-dried at 200°C for 12 hours to obtain an amphiphilic terpolymer;

[0036] Step 2, preparation of amphiphilic terpolymer modified ultrafiltration membrane: blend 1.2g of amphiphilic terpolymer with 17mL of NMP to obtain mixed solution B, wherein the concentration of amphiphilic terpolymer 0.6%, sonicate until the amphiphilic terpolymer is co...

Embodiment 3

[0038] This embodiment includes the preparation of amphiphilic terpolymer and the preparation of amphiphilic terpolymer modified ultrafiltration membrane, including the following steps:

[0039] Step 1, the preparation of amphiphilic terpolymer: first, under nitrogen protection, 1.8g dimethylaminoethyl methacrylate (DMAEMA), 2.0g methacryloyl ethyl sulfobetaine (SBMA), 1.7g of vinylpyrrolidone (VP) and 0.35g of AIBN were dissolved in 80ml of tetrahydrofuran and ethanol mixture A with a volume ratio of 5:1, stirred and reacted for 20 hours to obtain a mixed system, and the mixed system was poured into deionized water to precipitate a precipitate ; Finally, vacuum-dry the precipitate at 250°C for 24 hours to obtain an amphiphilic terpolymer;

[0040] Step 2, preparation of amphiphilic terpolymer modified ultrafiltration membrane: 2.0 g of amphiphilic terpolymer is blended with 17 mL of NMP to obtain mixed solution B, wherein the concentration of amphiphilic terpolymer is 1%, so...

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Abstract

The invention discloses an amphiphilic terpolymer modified ultra-filtration membrane preparation method, and belongs to the technical field of membrane separation. The specific scheme comprises: 1, copolymerizing dimethylaminoethyl methacrylate, methacryloylethylsulfobetaine and vinyl pyrrolidone through a reversible addition-chain fragmentation transfer polymerization method to prepare a structure-controllable amphiphilic terpolymer; and 2, blending the terpolymer and polyaryletherketone to obtain a membrane casting solution, and preparing the ultra-filtration membrane through a non-solvent induced phase inversion method. According to the invention, in the membrane casting solution of the organic solvent, the polarity of the hydrophobic chain segment in the amphiphilic polymer is similarto the polarity of polyaryletherketone, so that the intermiscibility is improved; in the water phase, the hydrophilic chain segments in the amphiphilic polymer are enriched on the surface of the membrane, so that the antifouling effect is achieved; the pore size and the hydrophilicity of the ultra-filtration membrane are effectively regulated by adjusting the contents and the structures of the membrane forming substance and the modified additive in the membrane casting solution; and the method is simple to operate and has important application prospect.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a preparation method of an amphiphilic terpolymer modified ultrafiltration membrane. Background technique [0002] With the rapid development of modern industry and urban construction, the pollution of the natural environment, especially the water environment, caused by human activities has become increasingly serious. Water pollution accompanies the food industry, metal industry, textile industry, oil and gas field industry and other occasions, which seriously threatens the natural environment and ecological balance. In recent years, the application of polymer membrane separation technology in the field of water treatment has attracted more and more attention and has developed rapidly. Compared with traditional separation technology, membrane separation technology has the characteristics of good selectivity, energy saving, high efficiency, and easy integ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/14B01D69/02B01D67/00B01D71/40
CPCB01D61/145B01D67/0006B01D69/02B01D71/40
Inventor 李大龙高昌录孙秀花张瑛洁
Owner HARBIN INST OF TECH AT WEIHAI
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