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Method of surface functionalization of aramatic polyamides reverse osmosis thin film composite membrane

A technology of reverse osmosis composite membrane and aromatic polyamide, which is applied to the surface modification of quaternary ammonium salt and salicylaldehyde functional group of aromatic polyamide reverse osmosis composite membrane, and the field of surface functionalization of aromatic polyamide reverse osmosis composite membrane, which can solve the problem. Reduced permeability, poor modification uniformity, blockage of micropores of aromatic polyamide reverse osmosis composite membrane, etc., to achieve the effect of simple and easy method and easy industrialization

Inactive Publication Date: 2015-03-11
HUAIHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the modification uniformity of the aromatic polyamide reverse osmosis composite membrane surface by the above method is poor; it is easy to cause the micropore blockage of the aromatic polyamide reverse osmosis composite membrane, and the permeability is reduced; in addition, the aromatic polyamide reverse osmosis composite membrane surface is grafted In the process of copolymerization modification, the waste of monomer raw materials caused by homopolymerization of monomers is serious

Method used

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  • Method of surface functionalization of aramatic polyamides reverse osmosis thin film composite membrane
  • Method of surface functionalization of aramatic polyamides reverse osmosis thin film composite membrane
  • Method of surface functionalization of aramatic polyamides reverse osmosis thin film composite membrane

Examples

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Embodiment 1

[0046] Example 1 Preparation of aromatic polyamide-polysulfone composite membrane containing quaternary ammonium salt and salicylaldehyde functional groups on the surface

[0047] Step 1 Preparation of aromatic polyamide-polysulfone composite membrane containing acid chloride groups on the surface

[0048] Take the purified and dried polysulfone support membrane with a molecular weight cut-off of 20,000-50,000 and immerse it in a dichloromethane solution with a mass percent concentration of 3-15% m-phenylenediamine, immerse it at room temperature for 24 hours, take it out and air-dry it, and spray it at room temperature A dichloromethane solution containing isophthaloyl chloride, trimesoyl chloride and triethylamine with a mass percent concentration of 3-15%, after reacting at room temperature for 0.2 hours, raise the temperature to 50-90°C and continue the reaction for 2 hours , washed with acetone, and vacuum-dried to prepare an aromatic polyamide-polysulfone composite membr...

Embodiment 2

[0053] Example 2 Preparation of aromatic polyamide-polypropylene fiber non-woven composite membrane containing quaternary ammonium salt and salicylaldehyde functional groups on the surface

[0054] According to the method and operation steps of Example 1, the polysulfone support membrane in Step 1 of Example 1 was replaced with polypropylene non-woven fabric, that is, the aromatic polyamide-polypropylene non-woven fabric with "planting" quaternary ammonium salt and salicylaldehyde on the surface was obtained. Spun composite membrane (abbreviated as QS-PEG-PA / PP composite membrane).

Embodiment 3

[0055] Example 3 Preparation of aromatic polyamide-cotton fiber filter paper composite membrane containing quaternary ammonium salt and salicylaldehyde functional groups on the surface

[0056] According to the method and operation steps of Example 1, the polysulfone support membrane in Step 1 of Example 1 was replaced with cotton fiber filter paper, and the monodiethylamino polyethylene glycol in Step 2 was replaced with 2-(dimethylamino)ethylene glycol. Amine, that is, the aromatic polyamide-cotton fiber filter paper composite membrane (referred to as QS-DMA-PA / FP composite membrane) that is "planted" with quaternary ammonium salt and salicylaldehyde on the surface.

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Abstract

The invention provides a method of surface functionalization of an aramatic polyamides reverse osmosis thin film composite membrane, which is particularly characterized in that (1) the method that salicylaldehyde and a quaternary ammonium salt functional group are 'cultivated' on the surface of the aramatic polyamides reverse osmosis thin film composite membrane in a dot matrix manner is simple, convenient and easy to operate, and the 'cultivation' density can be subjected to chemical regulation according to the requirement; (2) the uniformity of the surface which is modified by the quaternary ammonium salt and salicylaldehyde functional groups in a dot matrix manner of the aramatic polyamides reverse osmosis thin film composite membrane is high, and the cellular structure and permeability of the aramatic polyamides reverse osmosis thin film composite membrane are not changed; (3) the surface of the aramatic polyamides reverse osmosis thin film composite membrane is simplified by utilizing quaternary ammonium salt and salicylaldehyde functional groups, so that the hydrophilia of the aramatic polyamides reverse osmosis thin film composite membrane can be improved, the performances of antibiosis and sterilization are improved, and the aramatic polyamides reverse osmosis thin film composite membrane is protected from chemistry damage.

Description

technical field [0001] The invention relates to a method for functionalizing the surface of an aromatic polyamide reverse osmosis composite membrane, in particular to a method for modifying the surface of an aromatic polyamide reverse osmosis composite membrane with functional groups of quaternary ammonium salt and salicylaldehyde, and belongs to the field of functional polymer materials. technical background [0002] Aromatic polyamides reverse osmosis thin film composite membrane (aromatic polyamides reverse osmosis thin film composite membrane) has become a mainstream product in the field of seawater desalination due to its large water flux, high salt rejection rate, good resistance to bacteria, and alkali resistance. This type of reverse osmosis composite membrane is made of an ultra-thin aromatic polyamide membrane compounded on a porous polysulfone or polyethersulfone support base membrane. However, the thorny problems in the use of aromatic polyamide reverse osmosis c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D71/56B01D69/12B01D67/00
Inventor 张田林张可人王妍
Owner HUAIHAI INST OF TECH
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