Reverse osmosis membrane with polyvinylamine grafted on surface, and preparation method thereof

A polyvinylamine, reverse osmosis membrane technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc. The effect of pollution performance, wide source of raw materials and mild reaction conditions

Inactive Publication Date: 2015-08-05
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the surface of the common aromatic polyamide composite reverse osmosis membrane generally has a high density of negative charges, it is generally difficult to contr...

Method used

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  • Reverse osmosis membrane with polyvinylamine grafted on surface, and preparation method thereof
  • Reverse osmosis membrane with polyvinylamine grafted on surface, and preparation method thereof
  • Reverse osmosis membrane with polyvinylamine grafted on surface, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Fix an aromatic polyamide composite reverse osmosis membrane with a size of 13 × 11 cm between two plexiglass frames and a rectangular hollow silica gel pad. The rectangular hollow silica gel pad has the same size as the plexiglass frame, and fully rinse with deionized water. reverse osmosis membrane surface;

[0024] (2) Prepare 25 mL of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride aqueous solution with a mass fraction of 1%, and quickly pour the aqueous solution on the membrane surface to completely wet the aqueous solution film surface;

[0025] (3) preparation 25ml mass fraction is the N-hydroxyl succinimide aqueous solution of 8%, pours on the reverse osmosis membrane containing 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride aqueous solution On the surface, shake slowly to mix completely;

[0026] (4) Prepare 25ml of an aqueous solution of polyvinylamine with a mass fraction of 0.05%, then pour the solution on the surface of the me...

Embodiment 2

[0034] (1) Fix an aromatic polyamide composite reverse osmosis membrane with a size of 25 × 20 cm between two plexiglass frames and a rectangular hollow silica gel pad. The rectangular hollow silica gel pad has the same size as the plexiglass frame, and rinse thoroughly with deionized water reverse osmosis membrane surface;

[0035] (2) Prepare 50 mL of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride aqueous solution with a mass fraction of 6%, and quickly pour the aqueous solution on the membrane surface to completely wet the aqueous solution film surface;

[0036] (3) preparation 50ml mass fraction is the N-hydroxysuccinimide aqueous solution of 5%, pours on the reverse osmosis membrane containing 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride aqueous solution On the surface, shake slowly to mix completely;

[0037] (4) Prepare 50 ml of an aqueous solution of polyvinylamine with a mass fraction of 0.50%, then pour the solution on the surface of the...

Embodiment 3

[0042] (1) Fix an aromatic polyamide composite reverse osmosis membrane with a size of 50 × 40 cm between two plexiglass frames and a rectangular hollow silica gel pad. The rectangular hollow silica gel pad has the same size as the plexiglass frame, and fully rinse with deionized water. reverse osmosis membrane surface;

[0043] (2) Prepare 150 mL of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride aqueous solution with a mass fraction of 4%, and quickly pour the aqueous solution on the membrane surface to completely wet the aqueous solution film surface;

[0044] (3) preparation of 150mL mass fraction is 10% N-hydroxysuccinimide aqueous solution, poured on the reverse osmosis membrane containing 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride aqueous solution On the surface, shake slowly to mix completely;

[0045] (4) Prepare 150ml of an aqueous solution of polyvinylamine with a mass fraction of 0.25%, then pour the solution on the surface of the mem...

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Abstract

The present invention relates to a reverse osmosis membrane with polyvinylamine grafted on the surface, and a preparation method thereof. According to the reverse osmosis membrane with polyvinylamine grafted on the surface, the carboxy on the surface of an aromatic polyamide composite reverse osmosis membrane and the primary amine group of polyvinylamine are connected, the high cation density hydrophilic polymer polyvinylamine is grafted on the surface of the aromatic polyamide composite reverse osmosis membrane by using a carboxy activation method using 1-(3-dimethylaminopropyl)-3-ethyl carbodiimide hydrochloride and N-hydroxysuccinimide, and the primary amine of the polyvinylamine reacts with the carboxy on the membrane surface so as to form the firm amide bond. The reverse osmosis membrane of the present invention has characteristics of surface negative charge density reducing and hydrophilicity increasing, and provides anti-pollution performances for proteins, surfactants and other contaminants. After the reverse osmosis composite membrane of the present invention is polluted, the flux decline rate is low, and the flux recovery rate is high after cleaning, such that the good anti-pollution performance is provided. In addition, the preparation method has characteristics of wide raw material source, mild reaction condition, and simple method.

Description

technical field [0001] The invention relates to a reverse osmosis membrane grafted with polyvinylamine on the surface and a preparation method thereof, belonging to the field of composite reverse osmosis membrane preparation. Background technique [0002] Reverse osmosis membrane technology is currently the mainstream seawater and brackish water desalination method. However, the development of reverse osmosis membrane technology has long been constrained by the fouling of reverse osmosis membranes. During the reverse osmosis desalination process, the pollutants in the raw material liquid adhere to the surface of the reverse osmosis membrane through deposition or adsorption, resulting in a decrease in the flux of product water and an increase in cleaning frequency. In order to improve the anti-fouling performance of the reverse osmosis membrane, people usually introduce some anti-fouling materials on the surface of the reverse osmosis membrane. Common anti-pollution materia...

Claims

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Application Information

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IPC IPC(8): B01D71/78B01D69/12B01D67/00B01D61/02
Inventor 王志邬军辉王纪孝王世昌
Owner TIANJIN UNIV
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