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Anti-pollution aromatic polyamide composite reverse osmosis membrane and preparation method thereof

A technology of aromatic polyamide and reverse osmosis membrane, which is applied in the field of separation membrane, can solve the problems of lower desalination rate of reverse osmosis membrane, lower degree of cross-linking of polyamide, difficult to balance membrane selectivity and anti-pollution, etc., to achieve water molecule transmission Low mass resistance, the effect of reducing mass transfer resistance

Inactive Publication Date: 2019-07-23
自然资源部天津海水淡化与综合利用研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the preparation technology has not yet been fully mastered, this method usually reduces the degree of polyamide crosslinking, resulting in a decrease in the desalination rate of the reverse osmosis membrane, and it is difficult to balance the selectivity and anti-fouling properties of the membrane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Soak the polysulfone ultrafiltration membrane fully cleaned with deionized water in the aqueous monomer solution, wherein the mass concentration range of m-phenylenediamine is 2%, the temperature is 15°C, the soaking time is 30 seconds, take it out and let it dry After drying; then soak one side in the oil phase monomer solution, the mass concentration range of trimesoyl chloride in the oil phase monomer solution is 0.3%, the temperature is -20 ° C, and the reaction time is 40 seconds; take out and let the organic solvent Volatilize completely, and the volatilization time is 40s, obtains nascent ecology reverse osmosis membrane; On the nascent ecology reverse osmosis membrane surface coating one deck functional layer precursor solution, this solution is made of amino-terminated polyethylene glycol (0.5wt%), polyethylene glycol Vinyl alcohol (mass fraction is 5%), silver nanoparticles (mass fraction is 1%, particle size is 3-10 nanometers), glutaraldehyde (mass fraction i...

Embodiment 2

[0036] Soak the polysulfone ultrafiltration membrane fully cleaned with deionized water in the aqueous phase monomer solution, which contains m-phenylenediamine in the mass concentration range of 0.1%, the temperature is 0°C, and the soaking time is 90 seconds. Take it out and dry it Then soak one side in the oil phase monomer solution, the mass concentration range of trimesoyl chloride contained in the oil phase monomer solution is 0.05%, the temperature is 5°C, and the reaction time is 40 seconds; take it out and let the organic solvent volatilize completely, The volatilization time is 40s, obtains nascent ecology reverse osmosis membrane; In nascent ecology reverse osmosis membrane surface coating one deck functional layer precursor solution, this solution is made of amino-terminated polyethylene glycol (0.2wt%), polyvinyl alcohol ( mass fraction is 2%), mesoporous silica nanoparticles (mass fraction is 0.5%, particle diameter is 50-150 nanometers), glutaraldehyde (mass frac...

Embodiment 3

[0038] Soak the polysulfone ultrafiltration membrane fully cleaned with deionized water in the aqueous monomer solution, which contains m-phenylenediamine at a mass concentration range of 1.5%, at a temperature of 0°C, for 30 seconds, take it out and dry it Then soak one side in the oil phase monomer solution, the mass concentration range of trimesoyl chloride contained in the oil phase monomer solution is 0.15%, the temperature is 0°C, and the reaction time is 10 seconds; take it out and let the organic solvent volatilize completely, The volatilization time is 50s, obtains nascent ecology reverse osmosis membrane; One deck functional layer precursor solution is coated on nascent ecology reverse osmosis membrane surface, and this solution is made of amino-terminated polyethylene glycol (0.1%), polyvinyl alcohol (mass. Fraction is 3%), graphene oxide (mass fraction is 0.5%, sheet diameter is 20-250 nanometers), glutaraldehyde (mass fraction is 0.8%), sodium hydroxide (mass fract...

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Abstract

The invention relates to an anti-pollution aromatic polyamide composite reverse osmosis membrane and a preparation method thereof. The preparation method of the reverse osmosis membrane comprises thefollowing steps of: soaking a cleaned polysulfone ultrafiltration membrane in a water phase monomer solution, taking out the polysulfone ultrafiltration membrane, airing the polysulfone ultrafiltration membrane, soaking one side of the polysulfone ultrafiltration membrane in an oil phase monomer solution, reacting for a period of time, taking out the polysulfone ultrafiltration membrane to completely volatilize an organic solvent to obtain a nascent state reverse osmosis membrane; coating the surface of nascent state reverse osmosis membrane with a layer of anti-pollution functional layer precursor solution, and performing heat treatment and rinsing to obtain the anti-pollution aromatic polyamide composite reverse osmosis membrane. A mixed matrix anti-pollution functional layer is constructed by a one-step method, the permeability of the functional layer is improved based on the design of the mixed matrix membrane, covalent bond fixation of the mixed matrix functional layer on the surface of the membrane is realized through chemical grafting and chemical crosslinking, and finally the anti-pollution reverse osmosis membrane with excellent long-term stability is obtained.

Description

technical field [0001] The invention belongs to the field of separation membranes, and relates to an anti-pollution aromatic polyamide composite reverse osmosis membrane and a preparation method thereof. Background technique [0002] Reverse osmosis has become a key technology in water treatment and plays an irreplaceable role in water resource recycling and energy saving and emission reduction. American Filmtec company launched FT-30 high-performance reverse osmosis composite membrane in 1980, realized the commercialization of reverse osmosis composite membrane, and successfully developed a series of reverse osmosis composite membranes successively. Due to the complexity of membrane fouling and the unclear understanding of the mechanism of membrane fouling, it is more difficult to solve the problem of membrane fouling, so membrane fouling has always been a difficulty restricting the further widespread application of reverse osmosis. [0003] The method to solve reverse osm...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/12B01D69/02B01D71/56B01D61/02
CPCB01D67/0093B01D69/125B01D69/02B01D71/56B01D61/025B01D2325/36
Inventor 王剑田欣霞赵曼郭春刚张慧峰张雨山
Owner 自然资源部天津海水淡化与综合利用研究所
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