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. Problems such as poor modification uniformity, reduced permeability, and waste of monomer raw materials can achieve the effect of easy industrialization and simple method.

Inactive Publication Date: 2013-10-16
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 p

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

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1 Preparation of aromatic polyamide-polysulfone composite membrane with 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 to 50,000 and immerse it in a methylene chloride solution with a concentration of 3 to 15% by mass percentage of m-phenylenediamine, immerse it at room temperature for 24 hours, take it out to air dry, and spray at room temperature A dichloromethane solution containing isophthaloyl chloride, trimesoyl chloride and triethylamine with a concentration of 3-15% by mass. After reacting at room temperature for 0.2 hours, increase the temperature to 50-90℃ and continue the reaction for 2 hours. , Wash with acetone, and dry in vacuum to obtain an aromatic polyamide-polysulfone composite membrane...

Embodiment 2

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

[0054] In accordance with 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 to obtain an aromatic polyamide-polypropylene non-woven fabric with quaternary ammonium salt and salicylaldehyde on the surface. Woven composite membrane (referred to as QS-PEG-PA / PP composite membrane).

Embodiment 3

[0055] Example 3 Preparation of aromatic polyamide-cotton fiber filter paper composite membrane with 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 changed to cotton fiber filter paper, and the monodiethylamino polyethylene glycol in step 2 was changed to 2-(dimethylamino)ethyl Amine, that is, an aromatic polyamide-cotton fiber filter paper composite membrane (referred to as QS-DMA-PA / FP composite membrane) that is "planted" on the surface of quaternary ammonium salt and salicylaldehyde.

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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 surface functionalization of aromatic polyamide reverse osmosis composite membranes, in particular to a method for surface modification of aromatic polyamide reverse osmosis composite membranes with quaternary ammonium salt and salicylaldehyde functional groups, belonging to the field of functional polymer materials. technical background [0002] 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 desalination rate, good bacterial resistance, and alkali resistance. This type of reverse osmosis composite membrane is made of an ultra-thin aromatic polyamide membrane composited on a porous polysulfone or polyethersulfone supporting bottom membrane. However, the thorny problems in the use of aromatic polyamide reverse osmosis composite membranes are membrane biological fouling and membrane chemical degradatio...

Claims

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Application Information

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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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