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Preparation method of high-flux polyimide composite ultrafiltration membrane

A technology of polyimide and ultrafiltration membrane, which is applied in ultrafiltration, chemical instruments and methods, membrane technology, etc., can solve the problem of low flux, and achieve the effect of simple operation, low cost and easy availability of raw materials

Inactive Publication Date: 2019-05-14
中复新水源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that PI ultrafiltration membranes have high retention rates for various proteins, but in general their flux is low, generally 100L / m 2 h, how to effectively improve the separation efficiency of PI ultrafiltration membranes has become the focus of researchers

Method used

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  • Preparation method of high-flux polyimide composite ultrafiltration membrane
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  • Preparation method of high-flux polyimide composite ultrafiltration membrane

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Experimental program
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Embodiment 1

[0030] Below in conjunction with specific embodiment, further illustrate the present invention, should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various equivalent forms of the present invention All modifications fall within the scope defined by the appended claims of the present application. Embodiment 1: a kind of preparation method of high flux polyimide composite ultrafiltration membrane, it may further comprise the steps:

[0031] Step (1): Dissolve dry 4,4'-diaminodiphenylmethane and p-phenylenediamine at a molar ratio of 1:1 in N-methylpyrrolidone, stir thoroughly for 2 hours, and then dry the Tetracarboxylic dianhydride and 3,3',4,4'-benzophenone tetracarboxylic dianhydride were added to the solution, and the polyamic acid solution was obtained after stirring and reacting at 70°C...

Embodiment 2

[0038] Embodiment 2: a kind of preparation method of high flux polyimide composite ultrafiltration membrane, it may further comprise the steps:

[0039] Step (1): Dissolve dry 3,3'-dimethyl-4,4'-diphenylmethanediamine and p-phenylenediamine at a molar ratio of 1:1 in N-methylpyrrolidone and stir well 1 hour, then add dry 3,3',4,4'-biphenyltetraic dianhydride and 4,4'-hexafluoroisopropylidene-phthalic anhydride to the solution, and stir at 40°C for reaction After 4 hours, a polyamic acid solution was obtained; wherein 3,3'-dimethyl-4,4'-diphenylmethanediamine or p-phenylenediamine and aromatic dianhydride (3,3',4,4'-linked The mol ratio of pyromellitic dianhydride and 4,4'-hexafluoroisopropylidene-phthalic anhydride) is 1:1.02;

[0040]Step (2): Add pyridine and acetic anhydride to the polyamic acid solution obtained in step (1), stir and react for 1 hour, then cool to room temperature, slowly add methanol dropwise under stirring until the color of the solution changes complet...

Embodiment 3

[0045] Embodiment 3: a kind of preparation method of high flux polyimide composite ultrafiltration membrane, it comprises the following steps:

[0046] Step (1): Dissolve dry 4,4'-diaminodiphenylmethane and p-phenylenediamine at a molar ratio of 1:1 in N,N-dimethylformamide, stir thoroughly for 1 hour, and then Dry pyromellitic dianhydride and 4,4'-hexafluoroisopropylidene-phthalic anhydride are added to the solution, and the polyamic acid solution is obtained after stirring and reacting at 90°C for 10 hours; where 4,4'- The molar ratio of diaminodiphenylmethane or p-phenylenediamine to aromatic dianhydride (pyromellitic dianhydride and 4,4'-hexafluoroisopropylidene-phthalic anhydride) is 1:1.02;

[0047] Step (2): Add triethylamine and propionic anhydride to the polyamic acid solution obtained in step (1), stir and react for 2 hours, then cool to room temperature, slowly add methanol with a volume concentration of 50% under stirring until the color of the solution Completely...

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Abstract

The invention discloses a preparation method of a high-flux polyimide composite ultrafiltration membrane. The method comprises the following steps: step (1), dissolving two types of aromatic diamine into a solvent, then adding aromatic dianhydride, and stirring to perform reaction, so as to obtain a polyamic acid solution; step (2), adding a catalyst and a dehydrating agent into the polyamic acidsolution obtained in the step (1), stirring to perform a reaction, cooling the solution to room temperature, dropwise adding methanol till the color of the solution completely becomes white from red,and performing suction filtration, so as to obtain solid powder, repeatedly washing through methanol and performing suction filtration, and drying, so as to obtain polyimide solid powder; step (3), dissolving the polyimide solid powder obtained in the step (2) into a solvent, stirring and dissolving, coating the powder onto a supporting layer, and then forming the polyimide composite ultrafiltration membrane. The obtained high-flux polyimide composite ultrafiltration membrane is high in pure water flux, and the retention rate of bovine serum albumin BSA can reach 99.5 percent or higher. The method can solve the problem that in the prior art, the separation efficiency of a polyimide ultrafiltration membrane is low.

Description

technical field [0001] The invention relates to a preparation method of an organic polymer separation membrane, in particular to a preparation method of a high-flux polyimide composite ultrafiltration membrane with excellent performance. Background technique [0002] Ultrafiltration membrane is a microporous filtration membrane with uniform pore size and rated pore size range of 2-100nm. The ultrafiltration membrane has the characteristics of larger membrane flux, low operating pressure, and low power requirements of the system. At present, the application fields of ultrafiltration membranes are very wide, such as reverse osmosis pretreatment in the preparation process of pure water and ultrapure water and terminal treatment of ultrapure water; industrial water is used to separate bacteria, heat sources, colloids, suspended impurities and Macromolecular organic matter; purification of drinking water and mineral water; concentration, purification and clarification of ferment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/64B01D69/12B01D61/14B01D67/00C02F1/44
Inventor 徐卫星杨乘宇王一光南洋乔光辉
Owner 中复新水源科技有限公司
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