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 d

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1

[0031] The polysulfone ultrafiltration membrane that has been fully cleaned with deionized water is immersed in the aqueous monomer solution. The mass concentration of m-phenylenediamine is in the range of 2%, the temperature is 15℃, and the immersion time is 30 seconds. After drying; then one side is soaked 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℃, and the reaction time is 40 seconds; take out the organic solvent The volatilization is complete and the evaporation time is 40s to obtain the nascent reverse osmosis membrane; a layer of functional layer precursor solution is coated on the surface of the nascent reverse osmosis membrane, the solution is terminated by amine-terminated polyethylene glycol (0.5wt%), poly It is composed of vinyl alcohol (mass fraction of 5%), silver nanoparticles (mass fraction of 1%, particle size of 3-10 nanometers), glutar...

Example Embodiment

[0035] Example 2

[0036] The polysulfone ultrafiltration membrane thoroughly cleaned with deionized water is immersed in the aqueous monomer solution, which contains m-phenylenediamine in the mass concentration range of 0.1%, the temperature is 0℃, and the immersion time is 90 seconds. ; Then one side is immersed in the oil phase monomer solution, the mass concentration range of trimesoyl chloride in the oil phase monomer solution is 0.05%, the temperature is 5℃, and the reaction time is 40 seconds; take out and let the organic solvent volatilize completely, The volatilization time is 40s, and the nascent reverse osmosis membrane is obtained; the surface of the nascent reverse osmosis membrane is coated with a functional layer precursor solution, which is terminated by amine-terminated polyethylene glycol (0.2wt%), polyvinyl alcohol ( The mass fraction is 2%), mesoporous silica nanoparticles (the mass fraction is 0.5%, the particle size is 50-150 nanometers), glutaraldehyde (the...

Example Embodiment

[0037] Example 3

[0038] The polysulfone ultrafiltration membrane that has been thoroughly cleaned with deionized water is immersed in the aqueous monomer solution. The mass concentration of m-phenylenediamine is in the range of 1.5%, the temperature is 0℃, and the immersion time is 30 seconds. ; Then one side is immersed in the oil phase monomer solution, the mass concentration range of trimesoyl chloride in the oil phase monomer solution is 0.15%, the temperature is 0℃, and the reaction time is 10 seconds; take it out and let the organic solvent evaporate completely, The volatilization time is 50s, and the nascent reverse osmosis membrane is obtained; a layer of functional layer precursor solution is coated on the surface of the nascent reverse osmosis membrane. The solution is terminated by amine-terminated polyethylene glycol (0.1%) and polyvinyl alcohol (quality The fraction is 3%), graphene oxide (mass fraction is 0.5%, sheet diameter is 20-250 nanometers), glutaraldehyde ...

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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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