Preparation method of nano-hybrid composite membrane

A hybrid composite and nano-technology, which is applied in the field of preparation of nano-hybrid composite membranes, can solve problems such as unstable performance of polyamide composite membranes, and achieve the effects of being beneficial to commercialization, popularization and application, low preparation cost and universal adaptability.

Active Publication Date: 2021-05-25
蓝星(杭州)膜工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a method for preparing a nano-hybrid composite membrane, which solves the problem that the performance of the polyamide composite membrane is unstable due to the inability of the nanoparticles to be uniformly hybridized into the polyamide functional separation layer technical issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Add sodium citrate and magnesium chloride to water to obtain an aqueous solution containing 0.5% sodium citrate and 0.2% magnesium chloride by mass fraction, then add 0.3% tetramethylammonium hydroxide, 1% MPD (m-phenylenediamine) and 0.2 % triethylamine, mix well, and stir in ultrasonic for 1h. Then prepare 0.2% trimesoyl chloride (TMC) oil phase solution (solvent is Isopar L). First coat the water phase solution on the polysulfone base film, pour off the excess solution after 60s, dry in the shade, then coat the oil phase solution on the shade-dried membrane, after 30s, pour off the excess oil phase solution, and dry it at 130°C Heat treatment in oven for 2min.

Embodiment 2

[0041] Add sodium citrate and magnesium chloride to water to obtain an aqueous solution containing 0.5% sodium citrate and 0.5% magnesium chloride by mass fraction, then add 0.3% tetramethylammonium hydroxide, 1% p-phenylenediamine and 0.2% diiso Propylethylamine, mix well, and stir in ultrasonic for 1h. Then prepare 0.2% trimesoyl chloride (TMC) oil phase solution. First coat the water phase solution on the polysulfone base film, pour off the excess solution after 60s, dry in the shade, then coat the oil phase solution on the shade-dried membrane, after 30s, pour off the excess oil phase solution, and dry it at 130°C Heat treatment in oven for 2min.

Embodiment 3

[0043] Add sodium citrate and calcium chloride to water to obtain an aqueous solution containing 1.0% sodium citrate and 0.5% calcium chloride by mass fraction, then add 0.3% tetramethylammonium hydroxide and 1% m-phthalylene Amine and 0.2% triethylamine, mix well, and stir in ultrasonic for 1.5h. Then prepare 0.2% trimesoyl chloride (TMC) oil phase solution. First coat the water phase solution on the polysulfone base film, pour off the excess solution after 60s, dry in the shade, then coat the oil phase solution on the shade-dried membrane, after 30s, pour off the excess oil phase solution, and dry it at 130°C Heat treatment in oven for 2min.

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Abstract

The invention relates to a preparation method of a nano-hybrid composite membrane. The preparation method comprises the following steps: when a water phase solution containing hybrid metal particles is prepared, adding water-soluble metal salt and a complexing agent into water so as to allow metal ions to be firstly combined with the complexing agent to form a stable complex which is uniformly distributed in the water phase; then adding a precipitant capable of reacting with the water-soluble metal salt to generate precipitates and a monomer for undergoing polymerizing to generate a composite membrane, and conducting stirring and mixing and/or performing ultrasonic treatment to obtain a water-phase solution containing uniform nanoparticles; and taking the water-phase solution as a reactant to participate in an interfacial polymerization reaction to generate a nano-particle hybridized composite membrane functional separation layer. According to the invention, the distribution uniformity of hybrid metal nanoparticles in the functional separation layer can be remarkably improved, the problem of membrane defects caused by uneven dispersion and even agglomeration of the nanoparticles is reduced, the water flux of the nano-hybrid composite membrane is improved while the high rejection rate of the nano-hybrid composite membrane is kept, the uniformity and stability of the permeability of the composite membrane are improved, and reproducibility is good.

Description

technical field [0001] The invention relates to the technical field of seawater desalination or sewage treatment, in particular to a preparation method of a nano-hybrid composite membrane. Background technique [0002] The increasingly serious water pollution and the scarcity of global fresh water resources are one of the most serious problems facing mankind in the 21st century. Seawater desalination and sewage reuse based on reverse osmosis technology are effective ways to increase freshwater resources. Reverse osmosis membrane is an artificial semipermeable membrane with certain characteristics made by simulating biological semipermeable membrane, and is the core component of reverse osmosis technology. At present, polyamide reverse osmosis composite membrane is the most advanced, efficient and most widely used type of reverse osmosis membrane. The polyamide reverse osmosis composite membrane is generally composed of a non-woven substrate, a polysulfone support layer and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D61/02C02F1/44C02F101/12
CPCB01D61/025B01D67/0088B01D69/12B01D69/125C02F1/441C02F2101/12
Inventor 陈可可罗宵谭惠芬洪勇琦刘文超潘巧明郑宏林
Owner 蓝星(杭州)膜工业有限公司
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