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Antimicrobial modified polyvinylidene fluoride membrane and preparation method thereof

A polyvinylidene fluoride film and modification technology, which is applied in the field of antibacterial modified polyvinylidene fluoride film and its preparation, achieves the effects of obvious killing effect, easy operation, and improved hydrophilicity

Inactive Publication Date: 2013-01-09
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the use of silver-loaded X-type molecular sieves to modify polyvinylidene fluoride membrane materials to develop polyvinylidene fluoride membranes with antibacterial functions has not been reported.

Method used

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  • Antimicrobial modified polyvinylidene fluoride membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of unmodified pure polyvinylidene fluoride film: mix 8.5g polyvinylidene fluoride and 1.5g polyethylene glycol (M6000) in 40mL solvent dimethylacetamide, stir well at 60°C until The polyvinylidene fluoride is completely dissolved to obtain a uniform casting solution. At 60°C, let stand at constant temperature for defoaming for 12 hours. Pour the casting solution on a glass plate, scrape it into a flat film with a thickness of about 250 microns, put it in deionized water at room temperature, solidify and form it, and after the film falls off the glass plate, the unmodified film can be obtained. Pure polyvinylidene fluoride membrane.

[0023] Antibacterial performance test: the antibacterial performance of the film obtained in this example against Staphylococcus aureus was measured by the zone of inhibition method, and the operation was as follows. In the ultra-clean workbench, draw 100 μL of Staphylococcus aureus suspension and mix with 15 mL of beef extrac...

Embodiment 2

[0026] Preparation of silver-loaded molecular sieve Ag-X: 13X molecular sieve was dried to constant weight and ground into powder. Add 1 g of dry 13X molecular sieve to 10 mL of AgNO with a concentration of 0.1 mol / L 3 In the solution, stir for 5 hours at 60°C in the dark, filter with suction, wash until there is no silver ion in the filtrate (dilute hydrochloric acid solution is dripped without precipitation), and dry at 60°C to obtain the silver-loaded molecular sieve Ag-X.

[0027] Preparation of antibacterial modified polyvinylidene fluoride membrane: Mix 0.5g Ag-X molecular sieve micropowder with 8.5g polyvinylidene fluoride, 1.5g polyethylene glycol (M6000) in 40mL solvent dimethylacetamide, at 60°C Stir well until the polyvinylidene fluoride is completely dissolved to obtain a uniform casting solution. At 60°C, let stand at constant temperature for defoaming for 12 hours. Pour the casting solution on a glass plate, scrape it into a flat film with a thickness of about ...

Embodiment 3

[0030] Preparation of silver-loaded molecular sieve Ag-X: Add 1.0 g of dry 13X molecular sieve to 10 mL of AgNO with a concentration of 0.5 mol / L 3 In the solution, stir at 60° C. in the dark for 5 hours, filter with suction, wash, and dry at 60° C. to obtain silver-loaded molecular sieve Ag-X.

[0031] Preparation of antibacterial modified polyvinylidene fluoride membrane: 1.0g Ag-X molecular sieve powder, 8.5g polyvinylidene fluoride, 1.5g polyethylene glycol (M6000) were mixed in 40mL solvent dimethylacetamide, at 60°C Stir thoroughly until the polyvinylidene fluoride is completely dissolved to obtain a uniform casting solution. At 60°C, let stand at constant temperature for defoaming for 12 hours. Pour the casting solution on a glass plate, scrape it into a flat film with a thickness of about 250 microns, put it in deionized water at room temperature, solidify and form it, and after the film falls off the glass plate, you can get the antibacterial modified polyphenylene ...

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Abstract

The invention discloses an antimicrobial modified polyvinylidene fluoride membrane and a preparation method thereof and belongs to the field of polymer modification. The ion exchange is performed between silver ion and a 13X molecular sieve to obtain a silver-loaded X type molecular sieve which contains antibacterial ingredients, and then the silver-loaded X type molecular sieve and polyvinylidene fluoride are blended to prepare the antimicrobial modified polyvinylidene fluoride membrane. The silver ion antibacterial function is introduced to the polyvinylidene fluoride membrane which is modified by the method, simultaneously the hydrophilic performance of the membrane is improved by the aid of the high hydrophilicity of the molecular sieve materials, antibacterial and anti-pollution capabilities of the polyvinylidene fluoride membrane are improved by the aid of the synergistic effect of multiple aspects, the service life of the membrane is prolonged, evident inhibition effect on breeding of bacteria and microorganism can be achieved, the modified membrane maintains good physical performance and appearance, the preparation process is simple and easy to operate, the conditions are mild, and the industrialization implementation is easy.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a modified membrane technology with antibacterial function. The anti-pollution performance and antibacterial performance of the modified polyvinylidene fluoride membrane are both improved. Background technique [0002] Polyvinylidene fluoride (PVDF) is a polymer material with excellent performance. Its excellent chemical stability, radiation resistance, thermal stability and mechanical strength make it show its talents in the field of membrane separation. PVDF membrane has been successfully used in chemical industry , food, medicine and biochemistry and many other fields. However, the surface of polyvinylidene fluoride membrane is extremely hydrophobic. When dealing with water-based fluids, due to the adsorption and growth of bacteria and microorganisms on the surface of the membrane, it is easy to cause membrane fouling and reduce the membrane flux, which limits it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08K9/02C08K3/08C08J9/28C08J5/18
Inventor 纪妍妍罗文张彪罗冬冬
Owner TIANJIN POLYTECHNIC UNIV
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