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Preparation method of aromatic polyamide composite membrane grafted with pyridinium ions and salicylaldehyde on the surface

An aromatic polyamide and surface grafting technology is applied in the field of preparation of a surface-grafted pyridinium ion and salicylaldehyde aromatic polyamide composite membrane, which can solve the problem of hydrolysis and breakage of ester bonds or amide bonds and affect the performance of the aromatic polyamide composite membrane. stability issues

Active Publication Date: 2016-05-18
HUAIHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, we are also well aware that the linking group between the aromatic polyamide composite membrane and the functional groups of salicylaldehyde and quaternary ammonium salt is an ester bond or an amide bond. To the stability of aromatic polyamide composite membrane performance

Method used

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  • Preparation method of aromatic polyamide composite membrane grafted with pyridinium ions and salicylaldehyde on the surface
  • Preparation method of aromatic polyamide composite membrane grafted with pyridinium ions and salicylaldehyde on the surface
  • Preparation method of aromatic polyamide composite membrane grafted with pyridinium ions and salicylaldehyde on the surface

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Example 1 Preparation of surface grafted pyridinium ion and salicylaldehyde aromatic polyamide composite membrane-1

[0031]Weigh 50 grams of N-(3-formyl-4-hydroxybenzyl)-4-vinylpyridinium chloride and dissolve it in deionized water, stir and dissolve to obtain a solution; cut the surface of a 16×16 cm square The aromatic polyamide composite membrane containing amino groups (see CN103464010 for its preparation method) is immersed in the above solution, the temperature is controlled at 10-25° C., and the membrane is taken out after 14 hours of reaction. The film taken out was washed with deionized water and dried in vacuum to prepare an aromatic polyamide composite film grafted with N-(3-formyl-4-hydroxybenzyl)-4-vinylpyridinium chloride salt on the surface.

Embodiment 2

[0032] Example 2 Preparation of surface grafted pyridinium ion and salicylaldehyde aromatic polyamide composite membrane-2

[0033] Weigh 50 grams of N-(3-formyl-4-hydroxybenzyl)-2-vinylpyridinium chloride and dissolve it in deionized water, stir and dissolve to obtain a solution; cut the surface of a 16×16 cm square The aromatic polyamide composite membrane containing amino groups (see CN103464010 for its preparation method) is immersed in the above solution, the temperature is controlled at 10-25° C., and the membrane is taken out after 14 hours of reaction. The film taken out was washed with deionized water and dried in vacuum to prepare an aromatic polyamide composite film grafted with N-(3-formyl-4-hydroxybenzyl)-2-vinylpyridinium chloride on the surface.

Embodiment 3

[0034] Example 3 Preparation of Surface Grafted Pyridinium Ion and Salicylaldehyde Aromatic Polyamide Composite Membrane-3

[0035] Take by weighing 50 grams of chloride N-(3-formyl-4-hydroxyl-5-tert-butylbenzyl)-4-vinylpyridinium salt and dissolve it in deionized water, stir and dissolve to prepare a solution; cut 16 Aromatic polyamide composite membrane with amino group on its surface (see CN103464010 for its preparation method) in a square of 16 cm, dipped in the above solution, temperature controlled at 10-25°C, reacted for 14 hours, then pulled out the membrane. Use deionized water to wash the film taken out, and dry it in vacuum to prepare the surface grafted with N-(3-formyl-4-hydroxyl-5-tert-butylbenzyl)-4-vinylpyridinium salt Aramid composite film.

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Abstract

The invention provides a preparation method of an aromatic polyamide composite membrane with surface grafted pyridinium ions and salicylaldehyde. According to the preparation method, amino groups on the surface of the aromatic polyamide composite membrane are taken as Michael donors, N-(3-formyl-4-hydroxy-R-benzyl) vinyl pyridinium is taken as Michael receptors, addition reaction is carried out so as to obtain the aromatic polyamide composite membrane with surface grafted pyridinium ions and salicylaldehyde.

Description

technical field [0001] The invention relates to a preparation method of a composite film of pyridinium ion and salicylaldehyde aromatic polyamide grafted on the surface, and belongs to the field of functional polymer materials. technical background [0002] Aromatic polyamide composite membranes (including reverse osmosis membranes, ultrafiltration membranes, and nanofiltration membranes, etc.) have become a popular choice for seawater desalination or sewage treatment due to their large water flux, high salt removal rate, good resistance to bacteria, and alkali resistance. mainstream products in the field. Since the surface hydrophilicity of the original aromatic polyamide composite membrane is relatively low, it is not conducive to the penetration of water molecules through the composite membrane, so improving the surface hydrophilicity of the aromatic polyamide composite membrane is an important technology. In recent years, people have coated hydrophilic polyvinyl alcohol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/56B01D69/12B01D69/10B01D67/00
Inventor 张田林程青芳王妍贾海红朱彩艳刘岩峰
Owner HUAIHAI INST OF TECH