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Preparation method of hydrophilic antimicrobial film of which surface is coated with dopamine and polyethyleneimine cations

A polyethyleneimine cation, polyethyleneimine technology, applied in the field of separation membrane, can solve problems such as unfavorable large-scale application, complicated experimental process, etc., and achieves simple and easy preparation process, maintenance of hydrophilic and antibacterial properties, and hydrophilicity. Long-lasting effect of water antibacterial properties

Inactive Publication Date: 2015-04-22
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, irradiation is used in the preparation of the film, which complicates the experimental process and is not conducive to large-scale applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of surface coating dopamine and polyethylenimine cationic hydrophilic antibacterial film, its preparation method comprises the following steps:

[0026] (1) Preparation of basement membrane

[0027] Add 12Kg of polyvinylidene fluoride and 2Kg of polyvinylpyrrolidone into 86Kg of dimethylformamide, stir and dissolve at 60°C to form a uniform casting solution, and then prepare it into a flat film by phase inversion method.

[0028] (2) Apply dopamine

[0029] Dissolve 0.2 g of dopamine in 15 mM Tris buffer solution, dilute to 1 L with deionized water, adjust the pH to 8.0 to obtain a dopamine solution, then soak the basement membrane in the solution for 24 hours, and finally take it out and use Ionized water washing;

[0030] (3) Coated with polyethyleneimine

[0031] Soak the film obtained in step 2) in an aqueous solution containing polyethyleneimine with a mass fraction of 5wt% for 24 hours, then take it out and wash it with deionized water;

[0032] (4) Cat...

Embodiment 2

[0036] A kind of surface coating dopamine and polyethylenimine cationic hydrophilic antibacterial film, its preparation method comprises the following steps:

[0037] (1) Preparation of basement membrane

[0038] Add 25Kg polysulfone and 8Kg polyethylene glycol into 67Kg methylpyrrolidone, stir and dissolve at 80°C to form a uniform casting solution, and then prepare it into a tubular membrane by phase inversion method.

[0039] (2) Apply dopamine

[0040] Dissolve 5 g of dopamine in 15 mM Tris buffer solution, dilute to 1 L with deionized water, adjust the pH to 9.0 to obtain a dopamine solution, then soak the basement membrane in the solution for 6 hours, finally take it out, and use deionized water wash with water;

[0041] (3) Coated with polyethyleneimine

[0042] Soak the film obtained in step 2) in an aqueous solution containing 20wt% polyethyleneimine by mass for 6 hours, then take it out and wash it with deionized water;

[0043] (4) Cationicization of surface c...

Embodiment 3

[0047] A kind of surface coating dopamine and polyethylenimine cationic hydrophilic antibacterial film, its preparation method comprises the following steps:

[0048] (1) Preparation of basement membrane

[0049]Add 18Kg polyimide and 6Kg polyvinylpyrrolidone to 76Kg dimethyl sulfoxide, stir and dissolve at 70°C to form a uniform outer layer casting solution; add 22Kg polyacrylonitrile and 5Kg polyoxyethylene to two Methylformamide is stirred and dissolved at 70°C to form a uniform inner layer casting solution, and then a double-layer hollow fiber membrane is prepared by a phase inversion method.

[0050] (2) Apply dopamine

[0051] Dissolve 2 g of dopamine in 15 mM tris buffer solution, dilute to 1 L with deionized water, adjust the pH to 10.0 to obtain a dopamine solution, then soak the basement membrane in the solution for 12 hours, finally take it out, and use deionized water wash with water;

[0052] (3) Coated with polyethyleneimine

[0053] Soak the film obtained ...

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PUM

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Abstract

The invention discloses a preparation method of a hydrophilic antimicrobial film of which the surface is coated with dopamine and polyethyleneimine cations. The preparation method comprises the following steps that a base film is prepared, the base film is immersed in a dopamine solution, a polydopamine layer is formed on the surface of the base film by dopamine auto-agglutination, and the polydopamine layer and a polyethyleneimine aqueous solution undergo a reaction so that the hydrophilic antimicrobial film is prepared by the cationization reaction. The preparation method is simple and easy and has mild reaction conditions. The prepared hydrophilic antimicrobial film has excellent hydrophilicity and antibacterial properties, reduces adherence of microbes such as organic matters and bacteria, has a bacterium killing capability and prolongs a film service life.

Description

technical field [0001] The invention belongs to the field of separation membranes, and in particular relates to a method for preparing a hydrophilic antibacterial membrane coated with dopamine and polyethyleneimine cations on the surface through surface coating and cationization. Background technique [0002] With the rapid development of society and economy, the global demand and consumption of water are also increasing. Compared with traditional water treatment methods (such as rectification, evaporation, extraction, etc.), the use of membrane methods for water treatment has the advantages of mild operating conditions, small footprint, and no phase change in the separation process. More and more attention, and more and more widely used in the world. No matter what kind of membrane (flat-plate membrane, tubular membrane, hollow fiber membrane, etc.) There are many reasons for membrane fouling, among which the two most common factors are organic matter and bacteria. For o...

Claims

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Application Information

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IPC IPC(8): B01D69/02B01D71/82B01D67/00
Inventor 薛立新石虎砚
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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