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Aromaticpolyamide composite reverse osmosis membrane modified by graft polymerization and preparation method thereof

A technology of aromatic polyamide and reverse osmosis membrane, which is applied in semi-permeable membrane separation, chemical instruments and methods, permeation/dialysis water/sewage treatment, etc. It can solve the problems of inconspicuous grafting and achieve simple process and chlorine resistance Good, easy-to-implement effect

Inactive Publication Date: 2010-09-01
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the finished aromatic polyamide composite reverse osmosis membrane (such as the RE2521-TL aromatic polyamide composite reverse osmosis membrane of Shihan Company), since the surface of the membrane does not contain highly active acid chloride groups, the MDMH on the surface of the finished membrane Grafting is not obvious

Method used

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  • Aromaticpolyamide composite reverse osmosis membrane modified by graft polymerization and preparation method thereof
  • Aromaticpolyamide composite reverse osmosis membrane modified by graft polymerization and preparation method thereof
  • Aromaticpolyamide composite reverse osmosis membrane modified by graft polymerization and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Dissolve 12.8g of 5,5-dimethylhydantoin in 50mL of an aqueous solution containing 5.6g of potassium hydroxide; dissolve 8.8mL of allyl bromide in 20mL of methanol; Stir in a constant temperature water bath for 2 hours, cool to 25°C, and dry under reduced pressure at this temperature to obtain a solid substance; finally, use 500 mL of petroleum ether to recrystallize the solid substance to obtain monomer ADMH.

[0014] The aromatic polyamide composite reverse osmosis membrane (RE2521-TL aromatic polyamide composite reverse osmosis membrane from Sehan Company) was rinsed with deionized water, and then the membrane surface was purged with nitrogen until dry. The aqueous solution containing the initiator AIBA with a mass concentration of 0.02% and the monomer ADMH with a mass concentration of 5.0% were respectively prepared. First, pour the initiator AIBA solution on the surface of the aromatic polyamide composite reverse osmosis membrane. After 15 minutes, remove the initi...

Embodiment 2

[0019] Firstly, the monomer ADMH was prepared by the same method as in Example 1. The difference from Example 1 was that the initiator AIBA and the monomer were loaded once during the preparation of the grafted polymerization modified aromatic polyamide composite reverse osmosis membrane. The operation of ADMH, and then change the time of graft polymerization to 10min.

[0020] The obtained graft polymerization modified aromatic polyamide composite reverse osmosis membrane was evaluated for chlorine resistance and anti-microbial pollution performance in the same manner as in Example 1, and the performance parameters are shown in Table 1.

Embodiment 3

[0022]Firstly, the monomer ADMH was prepared by the same method as in Example 1. The difference from Example 1 was that the initiator AIBA and the monomer were loaded once during the preparation of the grafted polymerization modified aromatic polyamide composite reverse osmosis membrane. The operation of ADMH, and then change the time of graft polymerization to 20min.

[0023] The obtained graft polymerization modified aromatic polyamide composite reverse osmosis membrane was evaluated for chlorine resistance and anti-microbial pollution performance in the same manner as in Example 1, and the performance parameters are shown in Table 1.

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Abstract

The invention discloses an aromaticpolyamide composite reverse osmosis membrane modified by graft polymerization and a preparation method thereof, belonging to a preparation technology of composite reverse osmosis membranes. The surface of the aromaticpolyamide composite reverse osmosis membrane modified by graft polymerization is provided with a 3-allyl-5,5-dimethylhydantion polymer. The preparation method comprises the steps of: reacting 5,5-dimethylhydantion with allyl bromide to prepare the 3-allyl-5,5-dimethylhydantion polymer as a monomer; and introducing the 3-allyl-5,5-dimethylhydantion polymer into the surface of the aromaticpolyamide composite reverse osmosis membrane by adopting zaodiisobutyronitrile amidine hydrochloride as an initiating agent through using a graft polymerization method to prepare the aromaticpolyamide composite reverse osmosis membrane modified by graft polymerization. The invention has simple process; and the prepared aromaticpolyamide composite reverse osmosis membrane modified by graft polymerization has properties of resisting chlorine and preventing microbial contamination.

Description

technical field [0001] The invention relates to a graft polymerization 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] Composite reverse osmosis membranes with aromatic polyamide as the ultra-thin separation layer have become the mainstream of commercial reverse osmosis membranes, and are widely used in seawater desalination, brackish water desalination, wastewater treatment, pure water and high-purity water preparation and other fields. However, due to the unsatisfactory hydrophilic property and the rough surface of the membrane, the aromatic polyamide membrane is susceptible to microbial fouling, causing attenuation of water flux and reduction of rejection rate. The conventional method to control microbial contamination is to chlorinate the raw material liquid. However, another significant disadvantage of aromati...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D71/78B01D69/12C02F1/44C08J7/16C08L77/00
Inventor 王志魏新渝张哲王纪孝王世昌
Owner TIANJIN UNIV
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