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Composite nanofiber filter screen and preparation method thereof

A technology of composite nanofibers and nanofiber layers, which is applied in the preparation of air filter materials and the field of air filter materials, can solve the problems of small filter membrane pore size, high porosity, high purification, etc., and achieve high specific surface area, high porosity, Enhanced interception effect

Pending Publication Date: 2021-10-29
NINGBO FOTILE KITCHEN WARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Melt-blown electret fibers are the most widely used membrane separation technology. Combining non-woven melt-blown materials with electret technology can greatly improve filtration efficiency without increasing the pressure drop, but the charge injected by the electret method is easily attenuated. , it is difficult to maintain a stable filtration efficiency
If you do not use the electret method and rely solely on physical methods to filter particles, you need the filter membrane to have the characteristics of small pore size and high porosity. Nanofibers just have the above advantages, but there will still be a large pressure drop during use.
[0003] Electrostatic dust collection is a process in which dust is negatively charged by electrostatic high-voltage discharge and then electrostatically adsorbed. However, this technology has a better effect on particles with larger particle sizes. If you want to improve the adsorption efficiency, you must increase the voltage, and the voltage If it is too high, it will easily produce side effects of ozone
[0004] Membrane separation technology uses melt-blown electret fibers the most, but the charge injected by the electret method is very easy to decay, especially in high temperature and humid environments. The higher the ability to purify particulate matter, the need to replace the new filter screen, which greatly increases the cost of the user

Method used

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  • Composite nanofiber filter screen and preparation method thereof
  • Composite nanofiber filter screen and preparation method thereof
  • Composite nanofiber filter screen and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1, the preparation of conductive PET substrate: disperse the graphite slurry purchased in deionized water, dilute to the solid content of graphene is 2wt%, get the graphene slurry after 300g dilutions and add binder cationic water-based polyurethane 300g , then add defoamer 100g, continue to stir evenly, form standby graphene coating. Put the graphene coating into the spray gun, and evenly spray it on the surface of the PET material, and measure the resistivity with a multimeter to be 10 4 Ω·m, stop spraying, and then put the sprayed PET into an oven for drying at 80°C.

[0033] Spinning electret nanofibers: 0.5g of silica SiO 2 Add nanoparticles into 44.5g N,N——dimethylformamide DMF, ultrasonically disperse for 10min, then add 5g of polyvinylidene fluoride PVDF, stir at 70°C for 4h, the speed is 200r / min, and prepare PVDF with a concentration of 10%. solution, the solution was light yellow, and it was left to cool for 12h.

[0034] Then the prepared solut...

Embodiment 2

[0054] Embodiment 2, the preparation of conductive PET substrate: disperse the purchased graphite slurry in deionized water, dilute to the solid content of graphene is 3wt%, take 300g diluted graphene slurry, add binder anionic water-based polyurethane 200g is stirred evenly, then adds defoamer 100g, forms the standby graphene coating. Put the graphene coating into the spray gun, and evenly spray it on the surface of the PET material, and measure the resistivity with a multimeter to be 10 3 Ω·m, stop spraying, and then put the sprayed PET into an oven for drying at 80°C.

[0055] Spinning nanofibers: 1g of titanium dioxide TiO 2 Nanoparticles and 10mg of sodium laurate were added to 43g of N,N-dimethylacetamide DMAC, ultrasonically dispersed for 20min, then polyacrylonitrile PAN6g was added, stirred at 70°C for 4h, the speed was 200r / min, and the concentration was prepared as 12% PAN solution, the solution is light yellow, and then the prepared solution is injected into the ...

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Abstract

The invention discloses a composite nanofiber filter screen which is characterized by comprising a base layer, a middle layer and a surface layer which are compounded together, wherein the base layer is a PET base material, the middle layer is a graphene conducting layer, and the surface layer is an electret nanofiber layer. The invention further discloses a preparation method of the composite nanofiber filter screen. The preparation method comprises the steps of preparation of conductive PET and preparation of polar nanofibers. Electrets are added in the preparation of the nanofibers, so that the nanofibers not only have a pure mechanical interception effect but also have an electrostatic adsorption effect on particulate matters, and not only can the pressure drop be reduced, but also the dosage of the nanofibers can be reduced under the same filtering efficiency.

Description

technical field [0001] The invention relates to an air filter material, and also relates to a preparation method of the air filter material, belonging to the technical field of air purification membranes. Background technique [0002] In recent years, with the rapid economic development, the problem of smog has become increasingly prominent and has become the focus of people's attention. The fine particles suspended in the smog can enter the lungs and cardiovascular of the human body through the respiratory system, leading to problems such as reduced human immunity and lung cancer. The main technologies of existing air filtration are electrostatic dust collection and membrane separation. Electrostatic dust collection is the process of electrifying dust by high-voltage discharge, and it is easy to generate ozone. Melt-blown electret fibers are the most widely used membrane separation technology. Combining non-woven melt-blown materials with electret technology can greatly i...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D71/50B01D71/48B01D71/44B01D71/42B01D71/34B01D67/00B01D61/02B01D50/00B01D46/54B01D46/00D04H1/728
CPCB01D71/42B01D71/34B01D71/48B01D71/50B01D71/44B01D67/0002B01D71/68B01D61/027B01D46/0001B01D46/543D04H1/728B01D50/00
Inventor 高婷婷俞辉郑军妹
Owner NINGBO FOTILE KITCHEN WARE CO LTD
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