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Preparation method of a water-wetting anti-fouling and chlorine-resistant aromatic polyamide composite membrane

A technology of aromatic polyamide and composite membrane, which is applied in the preparation of aromatic polyamide composite membrane and the preparation of water-wetting anti-fouling and chlorine-resistant aromatic polyamide composite membrane, which can solve the problems of marine biofouling and other problems, and achieve the goal of avoiding chemical pollution. Destruction, high resistance to chlorine and oxygen, stable and long-lasting running performance

Active Publication Date: 2020-11-24
HUAIHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the extension of membrane use time, the problem of marine biofouling still exists

Method used

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  • Preparation method of a water-wetting anti-fouling and chlorine-resistant aromatic polyamide composite membrane
  • Preparation method of a water-wetting anti-fouling and chlorine-resistant aromatic polyamide composite membrane
  • Preparation method of a water-wetting anti-fouling and chlorine-resistant aromatic polyamide composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 Preparation of water-wetting antifouling and chlorine-resistant aromatic polyamide composite membrane (1)

[0037] Step 1 Preparation of aromatic polyamide composite membrane grafted with dimethylamino-PEG chains on the surface

[0038] According to the methods and operating steps disclosed in Journal of Membrane Science 428 (2013) 403-409 or Journal of Membrane Science 457 (2014) 88-97, CN103349922B or CN105251372B, on the surface of the 10*10cm square microporous polysulfone support membrane, The nascent aromatic polyamide composite film containing acid chloride groups on the surface was prepared by interfacial polymerization of m-phenylenediamine and trimesoyl chloride, and the nascent aromatic polyamide composite film containing acid chloride groups on the surface was impregnated in dimethylaminopolyethylene Alcohol-600 (also known as dimethylamino PEG-600) in a mixed solution of 1,4-dioxane (20mL) and triethylamine (10mL) with a concentration of 5.5% by m...

Embodiment 2

[0045] Example 2 Preparation of water-wetting anti-fouling and chlorine-resistant aromatic polyamide composite membrane (2)

[0046] According to the method and operation steps of Example 1, the dimethylamino PEG-600 in Step 3 of Example 1 was replaced with dimethylamino PEG-2000 to obtain a water-wetting anti-fouling and chlorine-resistant aromatic polyamide composite membrane ( 2).

Embodiment 3

[0047] Example 3 Preparation of water-wetting anti-fouling and chlorine-resistant aromatic polyamide composite membrane (3)

[0048] According to the method and operation steps of Example 1, the N,N-dimethylethanolamine in step 3 of Example 1 was replaced with diethylaminopolyethylene glycol-2000 to obtain a water-wetting anti-fouling and chlorine-resistant aromatic Polyamide composite membrane (3).

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Abstract

The invention provides a water affinity type anti-pollution chlorine-resistant aramid composite membrane preparation method. The densities of a PEO chain, quaternary ammonium cation and salicylaldehyde which are grafted to the surface of a high-performance aramid composite membrane are high, the membrane surface hydrophilicity is high; a part sensitive to residual chlorine or chloride oxide compound in sea water of the composite membrane is eliminated through alkylation reaction of aramid active layer N-H groups, chemical damage to the composite membrane in a seawater desalination process is effectively avoided, and long-time stability of a structure of the aramid composite membrane is ensured; salicylaldehyde grafted to the membrane surface are in monomolecular-layer uniform distributionand can efficiently filter and adsorb heavy metal ions in the seawater, a synergistic antibacterial killing function between the quaternary ammonium cation and salicylaldehyde is generated, and positive significance in ensuring cleanness of the membrane surface is achieved.

Description

technical field [0001] The invention relates to a method for preparing an aromatic polyamide composite membrane, in particular to the preparation of a water-wetting anti-fouling and chlorine-resistant aromatic polyamide composite membrane grafted with polyethylene glycol chains, quaternary ammonium cations and salicylaldehyde functional groups on the surface The preparation method belongs to the field of functional polymer materials. Background technique [0002] The aromatic polyamide composite membrane (aromatic polyamides thin film composite membrane, APA-TFC membrane) is composed of an ultra-thin aromatic polyamide membrane deposited on a porous polysulfone or polyethersulfone supporting base membrane; aromatic polyamide refers to is a polymer of m-phenylenediamine and trimesoyl chloride. This type of membrane has large water flux and high desalination rate, and has become the mainstream product for desalination of seawater and sewage treatment. However, during the use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/56B01D69/12B01D67/00
CPCB01D67/0002B01D69/125B01D71/56
Inventor 张田林班鑫鑫樊变花陈枫
Owner HUAIHAI INST OF TECH
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