Preparation method of multilayer polyamide composite reverse osmosis membrane

A technology of reverse osmosis membrane and polyamide membrane, which is applied in the preparation process of multi-layer polyamide membrane and the field of corresponding membrane products, can solve the problem of increasing the flux and retention rate of reverse osmosis membrane and increasing the bonding force between the polyamide layer and the support layer. The contact force between the film and the active layer is not strong, and the antibacterial performance is not good.

Active Publication Date: 2022-03-15
深圳市惠康水务集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyamide is a common reverse osmosis membrane material. Interfacial polymerization is the manufacturer’s polyamide preparation method. However, conventional interfacial polymerization has weak contact force between the base membrane and the active layer, and the water flux is not high. It will reduce the rejection rate and the disadvantages of poor antibacterial performance
[0003] In the prior art, surface treatment and mixed doping are often used to increase the permeability and rejection rate of polyamide reverse osmosis membranes, but the conventional rejection rate and permeability Since the TRADE-OFF effect cannot be improved at the same time, there is an urgent need for a membrane with high antibacterial properties that can simultaneously increase the flux and rejection rate of the reverse osmosis membrane and increase the bonding force between the polyamide layer and the support layer.

Method used

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  • Preparation method of multilayer polyamide composite reverse osmosis membrane

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Embodiment 1

[0025] The application provides a method for preparing a composite reverse osmosis membrane, comprising the following steps:

[0026] A) Preparation of base film: Weigh polysulfone resin with a weight ratio of 18% and dissolve it in N,N-dimethylformamide, add polyvinyl alcohol with a weight ratio of 4.0%, stir at 60°C for 3h, and prepare into a uniformly dispersed solution; the solution is filtered and vacuum degassed, and evenly coated on the non-woven fabric, with a wet film thickness of about 100 μm, and then immediately immersed in pure water at 20 ° C to solidify the gel and form a film, and spray on the polysulfone film 30% sulfuric acid solution at 25°C to obtain a polysulfone-based membrane;

[0027] B) Preparation of the surface modification layer of the basement film, weigh 6.0g of tris in a beaker, add an appropriate amount of ultrapure water to dissolve, transfer to a 1L volumetric flask, and adjust the pH to 6.0 with hydrochloric acid to obtain Tris-HCl buffer. ...

Embodiment 2

[0036] A) Preparation of base film: Weigh polysulfone resin with a weight ratio of 18% and dissolve it in N,N-dimethylformamide, add polyvinylpyrrolidone with a weight ratio of 4.0%, stir at 60°C for 3h, and prepare into a uniformly dispersed solution; the solution is filtered and vacuum degassed, and evenly coated on the non-woven fabric, with a wet film thickness of about 100 μm, and then immediately immersed in pure water at 20 ° C to solidify the gel and form a film, and spray on the polysulfone film 30% sulfuric acid solution at 25°C to obtain a polysulfone-based membrane;

[0037] B) Preparation of the surface modification layer of the basement film, weigh 6.0g of tris in a beaker, add an appropriate amount of ultrapure water to dissolve, transfer to a 1L volumetric flask, and adjust the pH to 6.0 with hydrochloric acid to obtain Tris-HCl buffer. Weigh 0.2 g of dopamine, add it to the above buffer solution to form a dopamine modified solution, filter the dopamine modifi...

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Abstract

The invention relates to a preparation method of a multi-layer polyamide composite reverse osmosis membrane, which comprises the following steps of: adding polyvinyl alcohol or polyvinylpyrrolidone into a polysulfone membrane, performing pressure filtration on a dopamine solution on the polysulfone membrane in a press-in manner, and reacting the dopamine solution to form a polydopamine layer on the surface of the membrane and in membrane holes, thereby obtaining the multi-layer polyamide composite reverse osmosis membrane. Then the base membrane with the polydopamine layer is sequentially immersed into a low-concentration water phase solution and an oil phase solution, due to the fact that the concentration of the water phase solution and the concentration of the oil phase solution are low, part of amido carried by the polydopamine layer exists on the surface of the membrane after the base membrane is immersed in the water phase, the amido can react with subsequent oil phase acyl chloride to generate amido bonds, and an interpenetrating structure is formed; and the connection between the polyamide layer and the polysulfone-based membrane layer can be enlarged. And a polydopamine layer and a polyamide structure are formed in the pores of the porous base membrane, so that the retention rate of the membrane is increased while the membrane flux is increased. Glutaraldehyde cross-linked chitosan complex silver is used as a polyamide protective layer, the chitosan surface has a plurality of hydroxyl groups and amino groups, so that the attack of chlorine can be defended, the chlorine resistance of the membrane is improved, and the antibacterial property of the membrane is improved due to the antibacterial property of silver.

Description

technical field [0001] The invention relates to a multilayer polyamide membrane preparation process and corresponding membrane products. Background technique [0002] Membrane technology is a common water treatment technology. Conventional membrane technologies are divided into reverse osmosis, forward osmosis, nanofiltration and ultrafiltration. Reverse osmosis technology is a separation method that separates the solute and the solvent in the solution by means of the selective interception of the reverse osmosis membrane under a certain pressure. Compared with other membrane types (nanofiltration, ultrafiltration, forward osmosis, microfiltration, etc.) In contrast, it has a smaller membrane pore size, which can effectively remove impurities such as salts, organic matter, colloids, and bacteria in water. Polyamide is a common reverse osmosis membrane material. Interfacial polymerization is the manufacturer’s polyamide preparation method. However, conventional interfacial p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/56B01D69/12B01D69/02B01D67/00B01D61/02
CPCB01D71/56B01D69/12B01D61/025B01D71/68B01D69/02B01D67/0002B01D2325/48Y02A20/131
Inventor 朱轶宁孙峰仲超
Owner 深圳市惠康水务集团有限公司
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