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Conductive and antibacterial polytetrafluoroethylene composite thin film and manufacturing method thereof

A polytetrafluoroethylene, composite film technology, applied in membrane technology, separation method, semi-permeable membrane separation and other directions, can solve the problems of electric spark explosion or combustion, property damage, accumulation, etc., to eliminate static electricity, low cost, toughness Good results

Inactive Publication Date: 2011-07-20
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since PTFE film is an insulating material, the surface resistivity is greater than 10 16 Ω / sq, during gas-solid separation, dust particles will collide and rub against the surface of the film to generate static electricity, which will accumulate with the extension of filtration time, and when the static electricity reaches a certain level, it will cause electric sparks and even explosions or burning, bring harm and property loss to society and human beings, so designing and preparing conductive films for gas dust filtration has very important practical significance

Method used

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  • Conductive and antibacterial polytetrafluoroethylene composite thin film and manufacturing method thereof
  • Conductive and antibacterial polytetrafluoroethylene composite thin film and manufacturing method thereof
  • Conductive and antibacterial polytetrafluoroethylene composite thin film and manufacturing method thereof

Examples

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Effect test

Embodiment 1

[0033] Embodiment 1: A wetting agent is ethanol, silver nitrate is an oxidizing agent, and the conductive polymer is the preparation of the conductive, bactericidal bifunctional polytetrafluoroethylene composite film of polypyrrole;

[0034] The polytetrafluoroethylene film (a circular film with a diameter of about 8-10cm) is wetted with ethanol, and then immersed in 800ml of an aqueous solution composed of 10mol / L silver nitrate, 1mol / L pyrrole and 2mol / L toluenesulfonic acid, at room temperature After standing still for 72 hours, the film was taken out, washed several times with distilled water, and dried to obtain a polytetrafluoroethylene film with conductive and bactericidal functions. The conductivity of the film was measured to be 5×10 -1 s / cm, the contact angle CA is 137° (60s), and the air permeability is 46 L / dm 2 / min@127Pa. Reactor such asfigure 1 As shown, the scanning electron microscope picture is as follows image 3 As shown, the infrared spectrogram is show...

Embodiment 2

[0035] Embodiment 2: A wetting agent is ether, silver nitrate is an oxidizing agent, and the conductive polymer is the preparation of the conductive, bactericidal bifunctional polytetrafluoroethylene composite film of polypyrrole;

[0036] The polytetrafluoroethylene film is wetted with ether, then immersed in 800ml of an aqueous solution composed of 7mol / L silver nitrate, 0.8mol / L pyrrole and 2mol / L D-camphor-10-sulfonic acid, and left standing at room temperature for 72h. The reaction device is as follows: figure 1 shown. After the film is taken out, it is rinsed several times with distilled water and dried to obtain a polytetrafluoroethylene film with the functions of conduction and sterilization. The conductivity of the film was measured to be 2×10 -2 s / cm, the contact angle CA is 131° (60s), and the air permeability is 48 L / dm 2 / min@127Pa.

Embodiment 3

[0037] Embodiment 3: A wetting agent is acetone, silver nitrate is an oxidizing agent, and the conductive polymer is polypyrrole, and the preparation of the conductive, bactericidal bifunctional polytetrafluoroethylene composite film;

[0038] Wet the polytetrafluoroethylene film with acetone, then immerse it in 800ml of an aqueous solution composed of 0.5mol / L silver nitrate, 0.1mol / L pyrrole and 0.1mol / L 1,5-naphthalene disulfonic acid, let it stand at room temperature for 72h, and react device such as figure 1 shown. After the film is taken out, it is rinsed several times with distilled water and dried to obtain a polytetrafluoroethylene film with the functions of conduction and sterilization. The conductivity of the film was determined to be 3×10 -3 s / cm, the contact angle CA is 135° (60s), and the air permeability is 63 L / dm 2 / min@127Pa.

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Abstract

The invention discloses a conductive and antibacterial polytetrafluoroethylene composite thin film, which is a polytetrafluoroethylene / conductive polymer / silver composite film prepared by using polytetrafluoroethylene thin film as a substrate, wetting the substrate with a wetting agent, using solution containing silver ions as oxidizer and an inorganic or organic acid as a doping agent and performing chemical polymerization of a conductive polymer monomer on the surface of the substrate. Besides filtering dust in air, the polytetrafluoroethylene / conductive polymer / silver composite film also has conductive and antibacterial functions; meanwhile, the conductivity of the composite thin film can reach over 2*10<-4>S / cm, the static electricity in the filtering process can be eliminated, and the stripping of dust and the long-term effective, continuous and stable operation of the filtering process can be realized more easily. The composite filtering film can be used in fields of air purification, air-solid separation and the like. The invention also discloses the manufacturing method of the conductive and antibacterial polytetrafluoroethylene composite thin film.

Description

technical field [0001] The invention relates to a conductive polymer composite material, in particular to a conductive and bactericidal double-functional polytetrafluoroethylene composite film and its preparation method. Background technique [0002] Polytetrafluoroethylene (PTFE) film has excellent high and low temperature performance, outstanding chemical stability, good dielectric properties and hydrophobicity. It is an ideal membrane material for separating fine particles under some harsh conditions, and is widely used in dust removal in the pharmaceutical industry , Sterilization, filtration of dust and particles in the air, product purification and material recovery in chemical production, waterproof, breathable textiles and water treatment and other industries. Since PTFE film is an insulating material, the surface resistivity is greater than 10 16 Ω / sq, during gas-solid separation, dust particles will collide with and rub against the surface of the film to generate ...

Claims

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Application Information

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IPC IPC(8): C08J7/16C08L27/18C08G73/02C08G73/06C08G61/12C08J7/12A61L9/00B01D71/36B01D69/12B01D67/00B01D46/54B01D46/50B01D53/22A61L101/02
Inventor 陆云时志权周晖戴庭阳
Owner NANJING UNIV
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