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Silver-containing antibacterial thin-layer composite film as well as preparation method and application thereof

A composite membrane and thin-layer technology, which is applied in the field of separation membranes, can solve the problems of poor durability of antibacterial performance on the surface of the membrane, increase the preparation steps, and long post-processing time, etc., to achieve increased durable antibacterial ability, simple preparation method, and low production cost. Effect

Pending Publication Date: 2021-03-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen that the above-mentioned prior art or by immersing the reverse osmosis membrane in the solution containing antibacterial metal, or by coating a layer of antibacterial function layer on the surface of the reverse osmosis membrane, although the antibacterial performance of the membrane surface has been improved, but the On the one hand, the antibacterial metal particles attached to the surface of the film will be lost rapidly with the use of the film, resulting in poor antibacterial performance on the surface of the film; on the other hand, the preparation steps are increased, and the post-processing time is long, which increases the production cost

Method used

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  • Silver-containing antibacterial thin-layer composite film as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Add 2 g of ethylenediamine and 100 mL of deionized water to 1 g of silver oxide and stir to obtain an ethylenediamine solution of silver oxide, and add 100 mL of Isopar E to 0.1 g of trimesoyl chloride and stir to obtain a trimesoyl chloride solution. The upper surface of the polysulfone support layer is contacted with the ethylenediamine solution containing silver oxide, and the liquid is discharged after contacting at 25°C for 30s; then, the upper surface of the support layer is contacted with the trimesoyl chloride solution, and the liquid is drained after contacting for 30s at 25°C ; Then, put the film into an oven and heat it at 70°C for 3 minutes to obtain the composite film AgR1. X-ray photoelectron spectroscopy test shows that the mass content of silver element on the composite film surface is 5.5wt%. Wherein, the average thickness of the polyamide separation layer is 218nm.

[0058] Soak the obtained composite membrane AgR1 in water for 24 hours, and then test...

Embodiment 2

[0060] Add 1 g of ethylenediamine and 100 mL of deionized water to 3 g of silver sulfate and stir to obtain an ethylenediamine solution of silver sulfate, and add 100 mL of Isopar G to 0.1 g of trimesoyl chloride and stir to obtain a trimesoyl chloride solution. Contact the upper surface of the polysulfone support layer with an ethylenediamine solution containing silver sulfate, and drain the liquid after contacting it for 60 seconds at 25°C; then, contact the upper surface of the support layer with a trimesoyl chloride solution, and drain the liquid after contacting it for 30 seconds at 25°C ; Then, put the film into an oven and heat it at 100°C for 2 minutes to obtain the composite film AgR2. X-ray photoelectron spectroscopy test shows that the mass content of silver element on the composite film surface is 8.1wt%. Wherein, the average thickness of the polyamide separation layer is 195 nm.

[0061] Soak the obtained composite membrane AgR2 in water for 24 hours, and then te...

Embodiment 3

[0063] 0.5 g of ethylenediamine and 100 mL of deionized water were added successively to 0.1 g of silver carbonate and stirred to obtain an ethylenediamine solution of silver carbonate, and 100 mL of Isopar E was added to 0.05 g of trimesoyl chloride and stirred to obtain a solution of trimesoyl chloride. Contact the upper surface of the above polysulfone support layer with ethylenediamine solution containing silver carbonate, and drain the liquid after contacting it at 25°C for 60 seconds; then, contact the upper surface of the support layer with trimesoyl chloride solution, and drain it after contacting it for 60 seconds at 25°C ; Then, put the film into an oven and heat it at 70°C for 4min to obtain the composite film AgR3. X-ray photoelectron spectroscopy test shows that the mass content of silver element on the composite film surface is 0.8wt%. Wherein, the average thickness of the polyamide separation layer is 182 nm.

[0064] The obtained composite membrane AgR3 was so...

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Abstract

The invention discloses a silver-containing antibacterial thin-layer composite film as well as a preparation method and application thereof. The composite film comprises an enhancement layer, a supporting layer and a separation layer, wherein the separation layer is located on one surface of the supporting layer, the enhancement layer is located on the other surface of the supporting layer, the supporting layer is a polymer porous membrane, and the separation layer is a polyamide separation layer loaded with a silver-containing compound, wherein the mass content of the elemental silver in theseparation layer is 0.1-10 wt%. The preparation method comprises the following steps: firstly, preparing a polyamine solution and a polyacyl chloride solution of a silver compound; and sequentially contacting the supporting layer with the polyamine solution and the polyacyl chloride solution containing the silver compound, and carrying out heat treatment. The silver-containing antibacterial thin-layer composite film prepared according to the invention has the advantages of lasting antibacterial performance, simple preparation process, suitability for mass production and the like.

Description

technical field [0001] The invention relates to the field of separation membranes, in particular to a silver-containing antibacterial thin-layer composite membrane and its preparation method and application. Background technique [0002] Thin-layer composite membranes including nanofiltration membranes and reverse osmosis membranes have been used in various fields, such as seawater and brackish water desalination, industrial wastewater treatment, and household drinking water purification. However, during use, microorganisms tend to grow on the surface of the membrane, form colonies after reproduction, and release metabolites, forming a biomass layer on the surface of the membrane, which seriously reduces the separation performance and water flux of the membrane. At the same time, the biomass layer becomes thicker and harder to remove over time. Introducing an antibacterial agent on the surface of the membrane to endow the membrane with the characteristics of contact sterili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/10B01D69/02B01D67/00
CPCB01D69/12B01D69/10B01D69/02B01D67/0079B01D2325/48
Inventor 于浩刘轶群潘国元张杨
Owner CHINA PETROLEUM & CHEM CORP
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