Preparation method of high-toughness nanofiltration membrane

A nanofiltration membrane and high toughness technology, applied in the field of preparation of high toughness nanofiltration membranes, can solve the problems of low retention efficiency and insufficient toughness of nanofiltration membranes, and achieve enhanced ion selection performance, enhanced chemical stability, mechanical properties and The effect of toughness enhancement

Pending Publication Date: 2019-11-01
刘雄
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention: Aiming at the defects of low interception efficiency and insufficient toughness of current nanofiltration membranes, a preparation method of nanofiltration membranes with high toughness is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0031] Preparation of mixed solution:

[0032]Put adipic acid and distilled water into a three-necked flask at a mass ratio of 1:5, mix and stir with a stirrer at a speed of 500r / min for 100min to obtain a mixed solution, and weigh 50 parts of the mixed solution, 13 parts of N , N'-dicyclohexylcarbodiimide, 0.4 parts of 4-dimethylaminopyridine and 20 parts of tetrahydrofuran were put into a beaker and mixed uniformly to prepare a mixed solution, which was set aside.

[0033] Preparation of Precast Mixture:

[0034] In parts by weight, weigh 13 parts of methoxybenzoic acid biphenol monoester, 40 parts of tetrahydrofuran and 8 parts of pyridine and put them into a beaker. Mix and stir for 50 minutes under the condition of 500r / min to prepare a prefabricated mixed solution.

[0035] Preparation of reflux product:

[0036] Put the spare mixed solution into the Erlenmeyer flask, drop the above-mentioned prefabricated mixed solution of 30% of the quality of the spare mixed soluti...

example 2

[0042] Preparation of mixed solution:

[0043] Put adipic acid and distilled water into a three-necked flask at a mass ratio of 1:5, mix and stir with a stirrer at a speed of 510r / min for 110min to obtain a mixed solution, and weigh 51 parts of the mixed solution, 14 parts of N , N'-dicyclohexylcarbodiimide, 0.5 parts of 4-dimethylaminopyridine and 21 parts of tetrahydrofuran were put into a beaker and mixed uniformly to prepare a mixed solution, which was set aside.

[0044] Preparation of Precast Mixture:

[0045] In parts by weight, weigh 1 part of methoxybenzoic acid biphenol monoester, 41 parts of tetrahydrofuran and 9 parts of pyridine and put them into a beaker, place the beaker in a water bath with a water bath temperature of 62°C, and use a stirrer at a speed of Mix and stir for 55 minutes under the condition of 510r / min to prepare a prefabricated mixed solution.

[0046] Preparation of reflux product:

[0047] Put the spare mixed solution into the Erlenmeyer flask...

example 3

[0053] Preparation of mixed solution:

[0054] Put adipic acid and distilled water into a three-necked flask at a mass ratio of 1:5, mix and stir with a stirrer at a speed of 520r / min for 120min to obtain a mixed solution, and weigh 52 parts of the mixed solution, 15 parts of N , N'-dicyclohexylcarbodiimide, 0.6 parts of 4-dimethylaminopyridine and 22 parts of tetrahydrofuran were put into a beaker and mixed uniformly to prepare a mixed solution, which was set aside.

[0055] Preparation of Precast Mixture:

[0056] In parts by weight, weigh 15 parts of methoxybenzoic acid biphenol monoester, 42 parts of tetrahydrofuran and 10 parts of pyridine and put them into a beaker. Mix and stir for 60 minutes under the condition of 520r / min to prepare a prefabricated mixed solution.

[0057] Preparation of reflux product:

[0058] Put the spare mixed solution into the Erlenmeyer flask, drop the above-mentioned prefabricated mixed solution of 40% of the quality of the spare mixed solu...

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Abstract

The invention relates to a preparation method of a high-toughness nanofiltration membrane, and belongs to the technical field of separation membrane preparation. According to the invention, the methodcomprises the following steps of melting and dispersing N,N'-dicyclohexylcarbodiimide in an adipic acid solution; dropwise adding methoxybenzoic acid diphenol monoester after dispersing, conducting heating, mixing and stirring; after stirring, performing suction filtration and drying to obtain a filter cake; mixing the filter cake with thionyl chloride; conducting heating condensation reflux reaction, conducting concentrating in vacuum to obtain a reflux product; mixing and stirring the reflux product and chitosan at a low temperature, and conducting freezing; conducting filtering in a freezing state to obtain a modified filter cake; and finally, mixing the modified filter cake with chitosan and acetic acid, and after mixing, coating a glass plate with the mixture and conducting drying toobtain the high-toughness nanofiltration membrane. According to the preparation method, polysulfone and N,N'-dicyclohexylcarbodiimide are used for modifying chitosan, so that a charged group is introduced into the chitosan, the interception capability of the nanofiltration membrane is enhanced, and an amide group is generated on a chitosan molecule through reaction, so that the mechanical strength and the chemical stability of the nanofiltration membrane are enhanced.

Description

technical field [0001] The invention relates to a preparation method of a high-toughness nanofiltration membrane, belonging to the technical field of separation membrane preparation. Background technique [0002] Nanofiltration is a pressure-driven membrane separation technology developed in the mid-1980s between reverse osmosis and ultrafiltration. Separation of dissolved components with a molecular size of approximately 1 nm. Nanofiltration membrane is an important membrane material for desalination of seawater and brackish water, softening of groundwater, removal of low-molecular organic matter in polluted water, and recovery of useful substances in industrial wastewater. Quality of Life. [0003] At present, most nanofiltration membranes are thin-layer composite membranes, that is, a layer of ultra-thin surface layer with nano-scale pores is compounded on the base membrane. Research on nanofiltration membranes in my country began in the early 1990s. Academician Gao Co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D71/08B01D69/02B01D67/00
CPCB01D67/0006B01D67/0011B01D67/0013B01D69/02B01D71/08B01D71/82B01D2325/24B01D2325/36
Inventor 刘雄
Owner 刘雄
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