A kind of antibacterial thin-layer composite film and preparation method thereof

The technology of composite membrane and antibacterial layer is applied in the field of antibacterial thin layer composite membrane and its preparation, which can solve the problems of loss of antibacterial inorganic nanoparticles, poor durability of antibacterial performance on the surface of the membrane, etc., and achieves strong antibacterial pollution performance and low production cost. , the effect of high salt interception rate

Active Publication Date: 2020-05-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the above-mentioned prior art can improve the antibacterial performance of the film surface, the method of adding antibacterial metal nanoparticles is to directly introduce the antibacterial nanoparticles on the surface of the thin-layer composite film to form an antibacterial composite layer, without in situ on the coating layer. Synthetic antibacterial nanoparticles, therefore, the antibacterial inorganic nanoparticles attached to the surface of the film will probably be lost quickly during the use of the film, resulting in poor durability of the antibacterial properties of the film surface

Method used

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  • A kind of antibacterial thin-layer composite film and preparation method thereof
  • A kind of antibacterial thin-layer composite film and preparation method thereof
  • A kind of antibacterial thin-layer composite film and preparation method thereof

Examples

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Embodiment 1

[0057] The carboxylated chitosan (the degree of carboxylation is 60%, the viscosity-average molecular weight is 80,000) aqueous solution that mass concentration is 0.04wt% is coated on the polyamide active layer surface of composite nanofiltration membrane (Dow Chemical NF90), after coating After covering the surface of the polyamide layer (i.e. the functional layer) with the covering liquid for 10 seconds, remove excess carboxylated chitosan solution on the surface of the polyamide layer, place it in an oven at 120° C. and dry it for 1 min before taking it out; the mass concentration is 2.5 wt % The copper chloride aqueous solution is in contact with the surface of the carboxylated chitosan of the composite nanofiltration membrane. After contacting for 5 minutes, the excess copper chloride solution is removed, and then the surface of the carboxylated chitosan treated with the copper chloride solution is compared with the mass concentration Contact with 0.05wt% glutaraldehyde a...

Embodiment 2

[0059] The carboxylated chitosan (the degree of carboxylation is 75%, the viscosity-average molecular weight is 120,000) aqueous solution that the mass concentration is 0.12wt% is coated on the polyamide active layer surface of composite nanofiltration membrane (Dow Chemical NF90), after coating After soaking the surface of the polyamide layer with the covering liquid for 20 seconds, remove excess carboxylated chitosan solution on the surface of the polyamide layer, place it in an oven at 100° C. for 3 minutes and take it out; Contact with the carboxylated chitosan surface of the composite nanofiltration membrane, after being in contact for 5 minutes, remove excess copper chloride solution, and then mix the carboxylated chitosan surface with a mass concentration of 0.1wt% through the copper chloride solution Contact the succinic dialdehyde aqueous solution for 3 minutes, then remove the excess succinic dialdehyde solution, and finally place it in an oven at 100° C. for 3 minute...

Embodiment 3

[0061] The carboxylated chitosan (the degree of carboxylation is 85%, the viscosity-average molecular weight is 200,000) aqueous solution that the mass concentration is 0.2wt% is coated on the polyamide active layer surface of composite nanofiltration membrane (Dow chemical NF270), after coating After soaking the surface of the polyamide layer with the covering liquid for 40 seconds, remove excess carboxylated chitosan solution on the surface of the polyamide layer, place it in an oven at 80° C. for 6 minutes and take it out; Contact with the carboxylated chitosan surface of the composite nanofiltration membrane, after being in contact for 5 minutes, remove excess copper chloride solution, and then mix the carboxylated chitosan surface with a mass concentration of 0.2wt% through the copper chloride solution The adipaldehyde solution was contacted for 6 minutes, and then the excess adipaldehyde solution was removed. Finally, it was placed in an oven at 80° C. for 6 minutes and t...

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Abstract

The invention relates to an antibacterial thin-layer composite film and a preparation method thereof. The preparation method comprises: carrying out infiltration treatment on the surface of the function layer of a thin-layer composite film by using a carboxylated chitosan coating solution, drying to obtain a carboxylated chitosan film positioned on the surface of the function layer, carrying out infiltration treatment on the carboxylated chitosan film by using a salt solution corresponding to the metal ions in antibacterial nanoparticles and a cross-linking agent solution, and carrying out heat treatment to prepare the antibacterial thin-layer composite film with the cross-linking structure. According to the present invention, the preparation method is simple, the production cost is low, and the prepared antibacterial thin-layer composite film has advantages of high water flux, good antibacterial property and strong antibacterial persistence, and has good industrialized production baseand broad application prospect.

Description

technical field [0001] The invention belongs to the technical field of thin-layer composite films, and in particular relates to an antibacterial thin-layer composite film and a preparation method thereof. Background technique [0002] Membrane separation technology is a new type of separation technology, which is widely used in food, biology, environmental protection, medicine and many other fields, and has the advantages of high efficiency, energy saving and environmental protection. The thin-layer composite membrane is a separation membrane with a microporous membrane or an ultrafiltration membrane as the supporting base membrane, and a layer of extremely thin and dense homogeneous membrane on its surface as the functional separation layer. The extremely thin surface dense layer makes the thin-layer composite membrane have better solute separation rate and water permeability rate, so the thin-layer composite membrane is widely used in the separation process of nanofiltrati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/74B01D69/12B01D69/02B01D67/00
Inventor 刘轶群张傲率潘国元张杨严昊徐健郭敏
Owner CHINA PETROLEUM & CHEM CORP
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