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Method for preparing in-situ polymerization amphoteric polyamine nanoparticle modified polyamide nanofiltration membrane

A nanoparticle and polyamine technology, which is applied in the field of membrane separation, can solve the problems of complex synthesis and modification methods of inorganic nanoparticles, limited scale and repeated stable preparation, etc.

Active Publication Date: 2017-09-08
艾德迈(北京)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synthesis and modification methods of inorganic nanoparticles are relatively complicated, and the dispersion of nanomaterials and their compatibility with polyamide-based membranes limit their large-scale and repeatable and stable preparation.

Method used

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  • Method for preparing in-situ polymerization amphoteric polyamine nanoparticle modified polyamide nanofiltration membrane
  • Method for preparing in-situ polymerization amphoteric polyamine nanoparticle modified polyamide nanofiltration membrane
  • Method for preparing in-situ polymerization amphoteric polyamine nanoparticle modified polyamide nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Dissolve 0.1g of N-aminoethylpiperazine propane-1-sulfonic acid inner salt and 0.01g of dopamine in 100g of aqueous solution, feed oxygen, and polymerize at 15°C for 8 hours to obtain an aqueous dispersion of amphoteric polyamine nanoparticles; then Adding 0.1g piperazine to 100g containing amphoteric polyamine nanoparticles mass percent concentration is 0.01wt% and containing sodium hydroxide mass percent concentration is 0.001wt% aqueous solution to be made into water phase solution; Immerse in the aqueous phase solution for 1 minute, take out and remove the excess aqueous phase solution on the surface; then immerse in a 0.1 wt% trimesoyl chloride-n-hexane solution, perform interfacial polymerization for 0.5 minutes, and cure at 45°C for 40 minutes. After being washed with deionized water, the polyamide nanofiltration membrane modified with amphoteric polyamine nanoparticles is obtained.

[0021] The polyamide nanofiltration membrane containing amphoteric polyamine na...

Embodiment 2

[0023] Dissolve 3g of N-aminoethylpiperazinepropane-1-sulfonic acid inner salt and 0.5g of dopamine in 100g of aqueous solution, feed oxygen, and polymerize at 25°C for 1 hour to obtain an aqueous dispersion of amphoteric polyamine nanoparticles; then 0.5g piperazine is added to 100g containing amphoteric polyamine nanoparticle mass percentage concentration and is 1wt% and the aqueous solution that contains sodium hydroxide mass percentage concentration is 0.01wt% is made into water phase solution; Immerse in the solution for 10 minutes, take out and remove the excess aqueous phase solution on the surface; then immerse in a 0.5 wt% trimesoyl chloride-n-hexane solution, perform interfacial polymerization for 5 minutes, and cure at 65°C for 10 minutes. After washing with ion water, the polyamide nanofiltration membrane modified with amphoteric polyamine nanoparticles is obtained.

[0024] The polyamide nanofiltration membrane containing amphoteric polyamine nanoparticles modifie...

Embodiment 3

[0026] Dissolve 2g of N-aminoethylpiperazinepropane-1-sulfonic acid inner salt and 0.2g of dopamine in 100g of aqueous solution, feed oxygen, and polymerize at 25°C for 6 hours to obtain an aqueous dispersion of amphoteric polyamine nanoparticles; then 0.3g piperazine is added to 100g and contains amphoteric polyamine nanoparticle mass percentage concentration and is 0.2wt% and contains the aqueous solution that sodium hydroxide mass percentage concentration is 0.005wt% to be made into water phase solution; Immerse in the phase solution for 2 minutes, take out and remove the excess water phase solution on the surface; then immerse in a 0.2 wt% trimesoyl chloride-n-hexane solution, perform interfacial polymerization for 2 minutes, and cure at 50°C for 20 minutes. After washing with deionized water, the polyamide nanofiltration membrane modified with amphoteric polyamine nanoparticles is obtained.

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Abstract

The invention discloses a method for preparing an in-situ polymerization amphoteric polyamine nanoparticle modified polyamide nanofiltration membrane. The method comprises the following steps: taking an amphoteric polyamine monomer molecule as a raw material, taking dopamine as a bionic adhesive, and performing in-situ polymerization in an aqueous solution to form amphoteric polyamine nanoparticles; and adding dopamine monomer molecules into the aqueous solution, and preparing an amphoteric polyamine-containing nanoparticle-modified polyamide nanofiltration membrane through interfacial polymerization. By utilizing the unique nano-pore structure and good hydrophilicity and adhesion stability of the amphoteric polyamine nanoparticles, the water permeation flux and anti-pollution stability of the membrane are greatly improved while maintaining a high retention rate of the polyamide membrane on an inorganic salt. The preparation method of the amphoteric polyamine-containing nanoparticle-modified polyamide nanofiltration membrane prepared by the invention is simple and feasible, in-situ generated particles have uniform and stable distribution in the membrane, the cost is low, and the method has excellent industrialized application prospects.

Description

technical field [0001] The invention belongs to the field of membrane separation, and in particular relates to a preparation method of in-situ polymerized amphoteric polyamine nanoparticle modified polyamide nanofiltration membrane. Background technique [0002] Membrane separation technology usually includes microfiltration, ultrafiltration, nanofiltration, reverse osmosis, pervaporation and membrane bioreactor, etc. Among them, nanofiltration is one of the membrane separation technologies with high efficiency, energy saving and environmental protection. It has been widely used in the fields of desalination, drinking water purification, wastewater treatment and separation of industrial substances. Membrane material is the core of the development of membrane separation technology and the key to its separation performance. Since Cadotte et al. prepared the first polyamide membrane by interfacial polymerization in 1972, commercial nanofiltration membranes have been dominated ...

Claims

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Application Information

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IPC IPC(8): B01D71/82B01D67/00B01D69/02B01D61/00
CPCB01D61/027B01D67/0006B01D67/0093B01D69/02B01D71/82B01D2325/18B01D2325/30B01D2325/36
Inventor 计艳丽钱伟杰安全福高从堦
Owner 艾德迈(北京)科技有限公司
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