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Preparation method of inorganic/organic hybridization antibacterial film

An organic hybrid, antibacterial membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. The effect of simple processing technology and less usage

Active Publication Date: 2012-06-13
天津鼎芯膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the improvement of hydrophilicity does not hinder the accumulation of microorganisms on the surface of the membrane to form a biological mucous membrane. The backwash cycle is too short, the energy consumption is too large, and the operating cost is affected.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Common A-type (3A, 4A or 5A), X-type, and Y-type molecular sieves are used as silver-loaded substrates, with a particle size of 0.5-7 μm, and silver nitrate (AgNO 3 ) or silver perchlorate (AgClO 4 ) is the silver ion donor. The silver salt is configured as a 0.025mol / L aqueous solution, and a certain amount of any one of the above-mentioned molecular sieves is added to the silver salt aqueous solution, stirred mechanically at 50°C for 2h, and the obtained molecular sieve is washed with pure water, and dried at 80°C for 4h. Repeat the above steps twice to obtain the molecular sieve loaded with silver ions.

[0044] Configure 0.04mol / L sodium borohydride (NaBH 4 ) aqueous solution, the molecular sieve loaded with silver ions that takes a certain amount of preparation adds NaBH 4 In the aqueous solution, stir at 0°C for 20 minutes, wash the obtained molecular sieve with pure water, and dry at 80°C for 8 hours to obtain the molecular sieve loaded with nano-silver partic...

Embodiment 2

[0046] Polyvinylidene fluoride (PVDF) is used as the film-forming substrate (the mass fraction of PVDF in the casting solution system is 17%), and dimethylacetamide (DMAc) is used as the solvent (the mass fraction of DMAC in the casting solution system is 77%) , polyvinylpyrrolidone (PVP, the mass fraction in the casting solution system is 5%), the nano-silver 3A molecular sieve antibacterial agent prepared by example 1 and the silane coupling agent (KH550) are additives (the mass fraction in the casting solution system is respectively 0.5% and 0.5%), prepared as a spinning solution at room temperature. Using dry-wet spinning process, spinning through a circular porous spinneret with an air gap of 10 cm, passing through a coagulation bath at a certain temperature, and then guiding to the winding wheel through a guide wheel; after the film is cut into sections, it is bundled and immersed Wash with ultra-filtered water and store in 30% glycerol aqueous solution. The prepared an...

Embodiment 3

[0048] Polyacrylonitrile (PAN) is used as the film-forming substrate (mass fraction in the casting solution system is 17%), dimethylformamide (DMF) is the solvent (the mass fraction of DMF in the casting solution system is 76%), polyacrylonitrile Ethylene glycol (PEG, the mass fraction in the casting solution system is 5%), the nano-silver 4A molecular sieve antibacterial agent prepared by example 1 and the silane coupling agent (KH540) are additives (the mass fraction in the casting solution system is respectively 1% and 1%), prepared as a spinning solution at room temperature. With reference to the spinning process in Example 2, the prepared antibacterial hollow fiber membrane is an asymmetric structure, and the water flux is 200L / m at 0.1MPa operating pressure 2 h, the antibacterial rate against Escherichia coli and Staphylococcus aureus both reached 97%.

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Abstract

The invention relates to a preparation method of an inorganic / organic hybridization antibacterial film. The preparation method mainly comprises the steps of: (1) preparing a nano-silver-loaded molecular sieve germicide with stronger stability by ion exchange and a chemical reduction method; and preparing a molecular sieve / polymer hybridization antibacterial film loaded with nano-silver particles by a phase transformation film preparation process; and (2) taking N,N-dimethylformamide as a solvent and a reducing agent simultaneously, reducing silver ions to nano-silver serving as an antibacterial function body in a film casting liquid system in situ, and firmly loading the nano-silver in a polymer porous matrix material by a dispersion action and a coupling action of a coupling agent so as to form a nano-silver-loaded polymer porous film. The hybridization antibacterial film, provided by the invention, keeps excellent water flux, high retention rate and tough mechanical intensity, and has excellent antibacterial function, and can effectively solve the problems of loss of the silver ions of the silver-ion-loaded molecular sieve in the membrane filtration, loss of the nanometer inorganic particles in the polymer porous matrix, easy pollution of a separation film by microorganisms, and the like.

Description

technical field [0001] The invention relates to the preparation of a novel hybrid antibacterial separation membrane, which is different from ordinary organic material separation membranes. It has an antibacterial function and can play the role of antimicrobial erosion, filtration, separation and water purification, and can be widely used in water purification. , sewage treatment and other fields. Background technique [0002] As a new type of high-efficiency fine filtration technology, membrane filtration has the advantages of no phase change, mild operating conditions, no introduction of third components, simple process flow, etc. It can replace traditional separation technologies such as rectification, evaporation, extraction, crystallization and other processes, so it has attracted widespread attention as a high-tech separation technology [see: Liu Mo'e et al. Membrane Separation Technology [M]. Beijing: Chemical Industry Press, 2000; Shi Jun, Yuan Quan, Gao Congxie. Memb...

Claims

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Application Information

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IPC IPC(8): B01D69/02B01D69/08B01D69/06B01D71/34B01D71/42B01D71/38B01D71/68B01D71/30B01D67/00
Inventor 张磊
Owner 天津鼎芯膜科技有限公司
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