Ultrafiltration membrane, nanofiltration membrane and method for preparing the same and ultrafiltration-nanofiltration reversible conversion

A technology of ultrafiltration membrane and nanofiltration membrane, which is applied in the direction of chemical instruments and methods, ultrafiltration, membrane, etc., can solve the problem of poor hydrophobicity, solvent corrosion resistance and heat resistance, hydrophobicity, solvent corrosion resistance, and poor temperature resistance , hydrophobicity, poor corrosion resistance to organic solvents, etc., to achieve the effect of high molecular weight, good corrosion resistance, and improved separation efficiency

Active Publication Date: 2021-07-27
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the main polymer materials widely used in the preparation of separation membranes are fluorine-containing resins such as polyvinylidene fluoride (PVDF), which have good film-forming properties and are generally used to prepare ultrafiltration and microfiltration membranes, but are hydrophobic and resistant to organic solvents. Corrosion is poor; sulfone-based resins such as polysulfone (PSU), polyethersulfone (PES), etc., have good temperature resistance and film-forming properties, and are generally used for ultrafiltration and nanofiltration membranes, but they are resistant to organic solvents. Not ideal; polyvinyl chloride (PVC) has low cost and general porosity, but its hydrophobicity, solvent resistance, and temperature resistance are poor; polyamide (PA) and polyimide (PI) have poor composition The porosity is poor, and it is generally used for nanofiltration and reverse osmosis membranes, and its acid and alkali corrosion resistance is poor; polypropylene (PP) is more environmentally friendly by thermoforming, and is suitable for microfiltration membranes, but its hydrophobicity and solvent resistance and poor heat resistance

Method used

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  • Ultrafiltration membrane, nanofiltration membrane and method for preparing the same and ultrafiltration-nanofiltration reversible conversion
  • Ultrafiltration membrane, nanofiltration membrane and method for preparing the same and ultrafiltration-nanofiltration reversible conversion
  • Ultrafiltration membrane, nanofiltration membrane and method for preparing the same and ultrafiltration-nanofiltration reversible conversion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Example 1 (10%-600N)

[0059] (1) Preparation of tertiary amine-containing diamine compound:

[0060] Add 389g of N,N'-bis(p-fluorobenzoyl-3-aminopropyl)methanamine, 255g of p-aminothiophenol, 138g of potassium carbonate, and 1500g of N,N-dimethylformamide into the reaction kettle , under the protection of nitrogen, dehydration reaction at 130 ° C for 0.5 h, and then at 155 ° C for 12 h, and finally the resulting reaction solution was cooled to room temperature, and poured into water while stirring to obtain the crude product of diamine containing tertiary amine; The above crude product was washed 4 times with deionized water, the filter cake was collected, and dried at a temperature of 80°C for 8 hours to obtain a purified tertiary amine-containing diamine compound, whose structural formula is as follows:

[0061]

[0062] Its infrared and NMR figure 1 As shown, 3436, 3216cm -1 Absorption peak for amine group, 1082cm -1 is the absorption peak of -S-; each proton...

Embodiment 2

[0075] Example 2 (20%-600N)

[0076] (1) Preparation of tertiary amine-containing diamine compound:

[0077] Add 389g of N,N'-bis(p-fluorobenzoyl-3-aminopropyl)methanamine, 255g of p-aminothiophenol, 138g of potassium carbonate, and 3000g of dimethyl sulfoxide into the reaction kettle, under nitrogen protection , dehydration reaction at 160°C for 1 hour, then reaction at 180°C for 12 hours, and finally the resulting reaction solution was cooled to room temperature, and poured into water while stirring to obtain a crude product containing diamine containing tertiary amine; then the above crude product was deionized Washing with water 4 times, collecting the filter cake, and drying at 80°C for 8 hours to obtain a purified tertiary amine-containing diamine compound;

[0078] (2) Preparation of polyamide resin containing tertiary amine

[0079] Dissolve 371.2g of diamine containing sulfide sulfone, 60g of diamine containing tertiary amine prepared above, and 274g of tripropylami...

Embodiment 3

[0090] Embodiment 3 (10% 600N-80% 464-10% m-phenylenediamine-50% TDC-50% terephthaloyl dichloride)

[0091] (1) Preparation of tertiary amine-containing diamine compound:

[0092] Add 389g of N,N'-bis(p-fluorobenzoyl-3-aminopropyl)methanamine, 218g of p-aminophenol, 80g of sodium hydroxide, and 3000g of N,N-dimethylacetamide into the reaction kettle , under the protection of nitrogen, dehydration reaction at 150°C for 1 hour, then reaction at 166°C for 8 hours, and finally the resulting reaction solution was cooled to room temperature, and poured into water while stirring to obtain a crude product containing diamine containing tertiary amine; The crude product was washed 5 times with deionized water, the filter cake was collected, and dried at a temperature of 90°C for 12 hours to obtain a purified diamine compound containing a tertiary amine, whose structural formula is as follows:

[0093]

[0094] (2) Preparation of polyamide resin containing tertiary amine

[0095] 37...

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Abstract

The invention relates to a polyamide ultrafiltration membrane containing a tertiary amine structure, a polyamide nanofiltration membrane containing a tertiary amine structure and a preparation method thereof, belonging to the field of polymer materials. The invention provides a polyamide separation membrane. The polyamide separation membrane is a tertiary amine-containing polyamide ultrafiltration membrane made of a tertiary amine-containing polyamide resin. The invention provides a novel ultrafiltration separation membrane. The obtained ultrafiltration membrane can be transformed into a nanofiltration membrane through acidification treatment; the obtained nanofiltration membrane can be restored to an ultrafiltration membrane through deacidification treatment, thereby realizing ultrafiltration-nanofiltration Filter reversible conversion.

Description

technical field [0001] The invention relates to a polyamide ultrafiltration membrane containing a tertiary amine structure, a polyamide nanofiltration membrane containing a tertiary amine structure and a preparation method thereof, belonging to the field of polymer materials. Background technique [0002] As a new type of separation technology, membrane separation has a very important research significance in material separation due to its advantages of low cost, low energy consumption, high efficiency, no pollution and recyclable useful substances. At present, it has been widely used in food, medicine, biology, energy, water treatment, bionics and other fields, which has had a huge impact on human production and life, and has become one of the most important methods in today's separation science. As we all know, the separation membrane is the core of the membrane separation process, and the membrane material is the basis for the development of the separation membrane. In t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/56B01D67/00B01D69/02B01D61/14B01D61/00
CPCB01D61/027B01D61/145B01D67/0081B01D67/0093B01D69/02B01D71/56B01D2325/24
Inventor 张刚王晗杨杰袁书珊毛其泽黄骁连英甫严永刚
Owner SICHUAN UNIV
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