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Modified magnesium oxide/polyether copolyamide nano composite membrane and preparation method thereof

A technology of polyether copolyamide and nanocomposite, which is applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve the problem of low compatibility between nanocomposite membranes and polymer phases, and achieve excellent mechanical properties and separation Good performance, the effect of reducing agglomeration

Inactive Publication Date: 2021-05-14
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention solves the technical problems of particle agglomeration and low compatibility with macromolecular phases in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: modified magnesium oxide / Pebax nanocomposite film (modified magnesium oxide content is 0.25%)

[0024] Preparation of surface-modified magnesia: first, put nano-magnesia in a vacuum oven at 80°C for 12 hours. Then take 0.1g (2%) of titanate coupling agent LD-A and 50ml of isopropanol into a three-necked flask, and heat in an oil bath until dissolved. Take 5g of dried magnesium oxide and 50ml of isopropanol in a three-necked flask, and stir for 100min with a powerful electric mixer. After that, wash and filter three times with absolute ethanol, and then wash and filter twice with deionized water. Finally, the obtained solid was dried in a vacuum oven at 80 °C for 24 h. The magnesium oxide modified by the titanate coupling agent is obtained through grinding and sieving.

[0025] Preparation of nanocomposite membrane: firstly, 0.0025g of modified magnesium oxide was dissolved in ethanol / water mixed solution, and ultrasonicated for 2h. Then put the above s...

Embodiment 2

[0027] Embodiment 2: modified magnesium oxide / Pebax nanocomposite film (modified magnesium oxide content is 0.5%)

[0028] Preparation of surface-modified magnesia: first, put nano-magnesia in a vacuum oven at 80°C for 12 hours. Then take 0.1g (2%) of titanate coupling agent LD-A and 50ml of isopropanol into a three-necked flask, and heat in an oil bath until dissolved. Take 5g of dried magnesium oxide and 50ml of isopropanol in a three-necked flask, and stir for 100min with a powerful electric mixer. After that, wash and filter three times with absolute ethanol, and then wash and filter twice with deionized water. Finally, the obtained solid was dried in a vacuum oven at 80 °C for 24 h. The magnesium oxide modified by the titanate coupling agent is obtained through grinding and sieving.

[0029] Preparation of nanocomposite membrane: firstly, 0.005g of modified magnesium oxide was dissolved in ethanol / water mixed solution, and ultrasonicated for 2h. Then put the above sol...

Embodiment 3

[0031] Embodiment 3: modified magnesium oxide / Pebax nanocomposite film (modified magnesium oxide content is 1%)

[0032] Preparation of surface-modified magnesia: first, put nano-magnesia in a vacuum oven at 80°C for 12 hours. Then take 0.1g (2%) of titanate coupling agent LD-A and 50ml of isopropanol into a three-necked flask, and heat in an oil bath until dissolved. Take 5g of dried magnesium oxide and 50ml of isopropanol in a three-necked flask, and stir for 100min with a powerful electric mixer. After that, wash and filter three times with absolute ethanol, and then wash and filter twice with deionized water. Finally, the obtained solid was dried in a vacuum oven at 80 °C for 24 h. The magnesium oxide modified by the titanate coupling agent is obtained through grinding and sieving.

[0033] Preparation of nanocomposite membrane: firstly, 0.01 g of modified magnesium oxide was dissolved in ethanol / water mixed solution, and ultrasonicated for 2 hours. Then put the above ...

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PUM

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Abstract

The invention belongs to the technical field of membrane preparation, and mainly relates to a modified magnesium oxide / polyether copolyamide nano composite membrane and a preparation method thereof. The method comprises the following steps of modifying magnesium oxide by using a titanate coupling agent as a modifier, dissolving the modified magnesium oxide and polyether copolyamide to prepare a membrane casting solution, and finally preparing the membrane casting solution into the membrane. The problems that magnesium oxide is poor in dispersity in a polymer substrate and poor in compatibility with polymers are solved, and the prepared modified magnesium oxide / polyether copolyamide nano composite membrane has high gas permeation flux and separation factors and is suitable for CO2 / N2 separation.

Description

technical field [0001] The invention belongs to the technical field of membrane preparation, and mainly relates to a modified magnesium oxide / polyether copolyamide nanocomposite membrane and a preparation method thereof. Background technique [0002] Membrane separation has developed rapidly after entering people's field of vision in the past few decades, because it has many advantages that traditional separation processes do not have, such as environmental friendliness, low equipment and operating costs, small footprint, and easy integration with other processes. Coupling, etc., have now been applied in various industrial processes. [0003] The size of magnesium oxide nanoparticles is small, the number of atoms on the surface is large, the number of atomic coordination is insufficient, and the existence of unsaturated bonds leads to many defects on the surface of nanoparticles. It is precisely because of the vacancy defects on the surface of the nanoparticles that it is v...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/14B01D67/00
CPCB01D67/0079B01D69/148B01D71/56
Inventor 赵晴段晓雅林俊林千果
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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