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Grafted modified aromatic polyamide composite reverse osmosis membrane and preparation method thereof

A kind of aromatic polyamide, reverse osmosis membrane technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology and other directions, to achieve the effect of easy implementation, good anti-microbial pollution performance, good antibacterial function

Active Publication Date: 2010-04-21
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research and application of hydantoin derivatives in the modification and preparation of liquid separation membranes have not yet been reported.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A 15×17 cm polysulfone support membrane was fixed in a polytetrafluoroethylene frame, the surface of the support membrane was rinsed repeatedly with deionized water, and the surface of the support membrane was purged with 30kPa nitrogen until dry. Dissolve 5.00 g of m-phenylenediamine, 5.75 g of camphorsulfonic acid, 3.77 mL of triethylamine, 0.375 g of sodium lauryl sulfate and 4.55 mL of dimethyl sulfoxide in 231 mL of deionized water to prepare Obtain an aqueous phase monomer solution; dissolve 0.99 g of trimesoyl chloride in 300 mL of n-hexane solution to prepare an oil phase monomer solution. Pour 50mL of the aqueous monomer solution on the surface of the polysulfone support membrane, and after contacting for 60s, drain the solution, and purge the membrane surface with 30kPa nitrogen to dryness. Then pour 50mL of the oil-phase monomer solution on the surface of the polysulfone support membrane. After the interfacial polymerization reaction for 60s, drain the soluti...

Embodiment 2～5

[0022] First, the same method as in Example 1 is used to prepare the aromatic polyamide composite reverse osmosis membrane to be grafted. The difference from Example 1 is that the MDMH is changed during the preparation of the grafted modified aromatic polyamide composite reverse osmosis membrane. concentration of the aqueous solution.

[0023] Table 1 lists the schedule of the raw materials used in Examples 2-5. The mass concentrations of the substances contained in the prepared aqueous phase monomer solution and the oil phase monomer solution are the same.

[0024] Table 2 lists the chlorine-resistant and anti-microbial fouling properties of the composite reverse osmosis membranes prepared in Examples 2-5 and Comparative Example 1. It can be seen from Table 2 that the water flux and salt rejection rate of the aromatic polyamide composite reverse osmosis membrane modified by MDMH graft modification after chlorination have small changes, indicating that the graft modified arom...

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Abstract

The invention discloses a grafted modified aromatic polyamide composite reverse osmosis membrane and a preparation method thereof, belonging to preparation technology of composite reverse osmosis membranes. The structural formula of the membrane is shown as follow. The preparation process comprises the following steps: taking a polysulphone membrane as a support membrane, preparing an aromatic polyamide composite reverse osmosis membrane to be grafted by an interfacial polymerization; enabling a graft modified solution containing 3-hydroxymethyl-5,5-dimethylhydantoin to contact the surface of the membrane to be grafted quickly for reacting, and conducting heat treatment to obtain the modified aromatic polyamide composite reverse osmosis membrane grafted with hydantoin derivatives. The invention has simple process, and the prepared membrane has the characteristics of good chlorine resistance and good microbial contamination resistance.

Description

technical field [0001] The invention relates to a graft-modified aromatic polyamide composite reverse osmosis membrane and a preparation method thereof, belonging to the preparation technology of the composite reverse osmosis membrane. Background technique [0002] Aromatic polyamide composite reverse osmosis membrane has the advantages of high desalination rate, water flux, and low operating pressure requirements, and has become the mainstream of commercial reverse osmosis membranes, and is widely used in seawater desalination, brackish water desalination, and wastewater treatment , Deionized water and high deionized water preparation and other fields. However, due to the poor hydrophilicity and rough membrane surface of the aromatic polyamide membrane, it is susceptible to microbial contamination, which causes the attenuation of water flux and the decrease of rejection rate. The conventional method to control microbial contamination is to chlorinate the raw material liqui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D71/78B01D67/00B01D69/12
Inventor 王志魏新渝陈静王纪孝王世昌
Owner TIANJIN UNIV
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