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Surface grafting modified aromatic polyamide composite reverse osmosis membrane and preparation method thereof

A technology of surface graft modification and aromatic polyamide, which is applied in the direction of semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problem of no antibacterial performance, discontinuous antibacterial performance on the membrane surface, and blank antibacterial performance on the membrane surface Issues such as antibacterial function and anti-biological pollution performance, high chlorine resistance performance and anti-biological pollution performance, and easy implementation are achieved.

Active Publication Date: 2013-09-04
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the reversible conversion process between halamine and its precursor, the halamine precursor does not have antibacterial properties before chlorination, which leads to discontinuous antibacterial properties on the membrane surface, when the halamine dissociates the chloride cation (Cl + ) is exhausted and the chlorination treatment is not carried out in time, there will be a blank period for the antibacterial performance of the membrane surface, which provides an opportunity for the adsorption and growth of microorganisms on the membrane surface

Method used

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  • Surface grafting modified aromatic polyamide composite reverse osmosis membrane and preparation method thereof
  • Surface grafting modified aromatic polyamide composite reverse osmosis membrane and preparation method thereof
  • Surface grafting modified aromatic polyamide composite reverse osmosis membrane and preparation method thereof

Examples

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Embodiment 1

[0019] A rectangular commercial reverse osmosis membrane with a size of 13 cm×11 cm is fixed in a polytetrafluoroethylene frame, which can ensure that only the upper surface of the membrane (aromatic polyamide separation layer) is in contact with the reaction during the entire grafting reaction. The surface of the aromatic polyamide composite reverse osmosis membrane was washed with deionized water for 5 min, and then the surface of the membrane was purged with nitrogen to dryness; 1.06g of 1-(3-dimethylaminopropyl)-3-ethylcarbodi Imine hydrochloride was added to 25 mL of deionized water, and the aqueous solution was poured on the surface of the membrane, and allowed to stand in the dark for 10 min to react. After the reaction is complete, add 0.53g of N-hydroxysuccinimide directly to the aqueous solution on the surface of the membrane, shake it slowly to dissolve it completely, and then let it stand in the dark for 10 minutes; add 1.32g of ethylenediamine to 25mL Then pour th...

Embodiment 2

[0025] A rectangular commercial reverse osmosis membrane with a size of 13 cm×11 cm is fixed in a polytetrafluoroethylene frame, which can ensure that only the upper surface of the membrane (aromatic polyamide separation layer) is in contact with the reaction during the entire grafting reaction. The surface of the aromatic polyamide composite reverse osmosis membrane was rinsed with deionized water for 5 min, and then the surface of the membrane was purged with nitrogen to dryness; 1.65g of 1-(3-dimethylaminopropyl)-3-ethylcarbodi Imine hydrochloride was added to 25 mL of deionized water, and the aqueous solution was poured on the surface of the membrane, and allowed to stand in the dark for 15 min to react. After the reaction is complete, directly add 0.82g of N-hydroxysuccinimide to the aqueous solution on the surface of the membrane, shake it slowly to dissolve it completely, and then let it stand in the dark for 15 minutes; add 1.32g of ethylenediamine to 25mL Then pour th...

Embodiment 3

[0029] A rectangular commercial reverse osmosis membrane with a size of 13 cm×11 cm is fixed in a polytetrafluoroethylene frame, which can ensure that only the upper surface of the membrane (aromatic polyamide separation layer) is in contact with the reaction during the entire grafting reaction. The surface of the aromatic polyamide composite reverse osmosis membrane was rinsed with deionized water for 5 min, and then the surface of the membrane was purged with nitrogen to dryness; 2.27g of 1-(3-dimethylaminopropyl)-3-ethylcarbodi Imine hydrochloride was added to 25 mL of deionized water, and the aqueous solution was poured on the surface of the membrane, and left to react in the dark for 20 min. After the reaction is complete, add 1.14g of N-hydroxysuccinimide directly to the aqueous solution on the surface of the membrane, shake it slowly to dissolve it completely, and then let it stand in the dark for 20 minutes; add 1.32g of ethylenediamine to 25mL Then pour the solution o...

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Abstract

The invention discloses a surface grafting modified aromatic polyamide composite reverse osmosis membrane and a preparation method thereof. The surface grafting modified aromatic polyamide composite reverse osmosis membrane is formed by the connection of carboxyl groups on the surface of the aromatic polyamide composite reverse osmosis membrane and one primary amine of ethidene diamine and the connection of another primary amine of the ethidene diamine and hydroxymethyl groups of imidazolidinyl urea. The preparation method of the surface grafting modified aromatic polyamide composite reverse osmosis membrane comprises the following steps of: activating the carboxyl groups on the surface of the membrane by 1-(3-dimethylamino propyl group)-3-ethyl carbodiimide hydrochloride and N-hydroxyl succinimide, so that the carboxyl groups react with the primary amine of the ethidene diamine, and the ethidene diamine is grafted to the surface of the membrane; and activating imidazolidinyl urea molecules according to the same process, so that the imidazolidinyl urea molecules react with the another primary amine of the ethidene diamine molecule grafted to the surface of the membrane, thus obtaining the surface grafting modified aromatic polyamide composite reverse osmosis membrane. The preparation method has the advantages of mild reaction conditions and simple process; and the prepared surface grafting modified aromatic polyamide composite reverse osmosis membrane has high properties of biological pollution resistance and chlorine-resistance.

Description

technical field [0001] The invention relates to a surface graft modified aromatic polyamide composite reverse osmosis membrane and a preparation method thereof, belonging to the field of composite reverse osmosis membrane preparation. Background technique [0002] For a long time, membrane biofouling and membrane chlorination caused by membrane biofouling control measures have been two key issues restricting the development of aromatic polyamide composite reverse osmosis membrane technology. [0003] At present, researchers' work mainly focuses on the development of chlorine-resistant reverse osmosis membranes and anti-biological fouling reverse osmosis membranes. In our previous work, the hydantoin derivatives 3-hydroxymethyl-5,5-dimethylhydantoin (MDMH) and 3-allyl-5,5-dimethylhydantoin (ADMH) passed through the membrane The method of surface graft modification was introduced into self-made primary reverse osmosis membrane (graft modified aromatic polyamide composite reve...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D71/78B01D69/12C08J7/16C08L77/00
Inventor 王志许骏王纪孝王世昌
Owner TIANJIN UNIV
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