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Preparation method of hydrophobic composite nanofiber air filtering membrane

A composite nanofiber and air filtration technology, which is applied in the direction of separation methods, dispersed particle filtration, chemical instruments and methods, etc., can solve the problems of complex process, high cost, and restrictions on wide application, and achieve the effect of simple operation and low cost

Active Publication Date: 2022-03-01
NINGBO FOTILE KITCHEN WARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most methods cannot achieve large-scale production of superhydrophobic surfaces due to the use of a large amount of volatile organic solvents that are harmful to the environment and human body during the preparation process, or due to high cost and complicated process, which limits their wide application.

Method used

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  • Preparation method of hydrophobic composite nanofiber air filtering membrane
  • Preparation method of hydrophobic composite nanofiber air filtering membrane
  • Preparation method of hydrophobic composite nanofiber air filtering membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Prepare solution one:

[0042] Add 10g of polyvinylidene fluoride PVDF with a molecular weight of 40W and 0.005g of lithium chloride LiCl to 40g of N,N-dimethylformamide DMF, stir at 70°C for 4h, and the speed is 200r / min, and the concentration is 20%. PVDF solution, the solution is light yellow and defoamed before spinning or standing for 12h.

[0043] Preparation solution two:

[0044]Add 5g of polyvinylidene fluoride PVDF with a molecular weight of 6.2W into 45g of N,N-dimethylformamide DMF, stir at 70°C for 4h at a speed of 200r / min, and prepare a PVDF solution with a concentration of 10%. The solution is Light yellow defoaming or standing for 12 hours before spinning.

[0045] Fill the solution 1 and the solution 2 into the syringe respectively, adjust the spinning parameters, and simultaneously spray and blend them, and spin them for 1 hour to obtain the blended membrane. Counter-jet blend reference figure 1 As shown, the middle is the collector 3, and the two...

Embodiment 2

[0060] Preparation solution 1: Add 9g of polyvinylidene fluoride PVDF with a molecular weight of 40W and 0.01g of sodium dodecylbenzenesulfonate to 41g of N,N-dimethylformamide DMF, stir at 70°C for 4h, and rotate at 200r / min, to prepare a PVDF solution with a concentration of 18%, and then add 0.9g of SiO2 nanoparticles into the solution, ultrasonically vibrate for 30min, defoam or stand still for 12h before spinning.

[0061] Preparation Solution 2: Add 2.5g of polystyrene PS with a molecular weight of 3W to 47.5g of N,N-dimethylformamide DMF, stir at 60°C for 2 hours, and prepare a solution with a concentration of 5%. PS solution, defoaming or standing for 12 hours before spinning.

[0062] Fill solution 1 and solution 2 into syringes respectively, adjust spinning parameters, and spin for 1 hour to obtain a blended membrane.

[0063] Solution 1: Spinning parameters temperature 25°C, humidity 50%, distance from nozzle tip to receiving end 15cm, receiving end rotating speed...

Embodiment 3

[0067] Preparation solution 1: Add 7g of polyacrylonitrile PAN with a molecular weight of 15W and 0.1g of polyethyleneimine PEI with a molecular weight of 6000 to 43g of N,N-dimethylacetamide DMAC, stir at 60°C for 4h, and rotate at a speed of 200r / min , prepared into a PAN solution with a concentration of 14%, defoaming or standing for 12 hours before spinning.

[0068] Preparation solution 2: Add 3g of polyacrylonitrile PAN with a molecular weight of 9W to 47g of N,N-dimethylacetamide DMAC, stir at 60°C for 2h, and the rotation speed is 200r / min, and prepare a PAN solution with a concentration of 6%. , Defoaming or standing for 12h before spinning.

[0069] Fill solution 1 and solution 2 into syringes respectively, adjust spinning parameters, and spin for 1 hour to obtain PAN blended membrane.

[0070] Solution 1: Spinning parameters temperature 25°C, humidity 50%, distance from nozzle tip to receiving end 15cm, receiving end rotating speed 500rpm, injection speed 30ul / min,...

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Abstract

The invention relates to a preparation method of a hydrophobic composite nanofiber air filtering membrane. The preparation method is characterized by comprising the following steps: (1) preparing a first solution; (2) preparing a second solution, wherein the molecular weight of the second polymer is smaller than that of the first polymer; and (3) filling the first solution into a first injector, filling the second solution into a second injector, and simultaneously performing opposite spraying and blending. And the selected material has hydrophobicity. The difference in molecular weight and viscosity of polymers in the first solution and the second solution results in coexistence of various morphologies, which contributes to hydrophobicity. And by combining electrostatic spinning, the method has unique advantages in the aspect of constructing a micro-nano scale two-stage coarse structure, and is low in cost, simple to operate and suitable for large-area material preparation.

Description

technical field [0001] The invention relates to an air filter membrane material, which belongs to the technical field of air purification filter membrane materials. Background technique [0002] At present, the main high-efficiency air filter materials on the market are melt-blown polypropylene PP fiber non-woven fabrics, polytetrafluoroethylene PTFE microporous membranes and ultra-fine glass fibers. [0003] The single fiber of melt-blown polypropylene PP fiber is 1-5um, which is equivalent to 1 / 10 of our hair, and the formed fiber pore size is generally distributed in 20-50um. If only the physical interception of melt-blown fibers is used to achieve high-efficiency filtration, it needs A very thick melt-blown layer and the pressure drop will be very large, resulting in a small amount of purified gas at a time. Therefore, in order to achieve high efficiency while ensuring air permeability, the melt-blown layer needs to pass through after the melt-blown process. Corona disc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/50B01D71/48B01D71/42B01D71/34B01D71/28B01D69/12B01D69/02B01D67/00B01D61/02B01D46/54
CPCB01D71/42B01D71/34B01D71/68B01D71/28B01D71/48B01D71/50B01D69/12B01D69/02B01D67/0002B01D61/027B01D46/543
Inventor 高婷婷王丹阳
Owner NINGBO FOTILE KITCHEN WARE CO LTD
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