Electrospinning nano-fiber electret filtering material and its preparation method

A nanofiber and filter material technology, applied in the field of electrospinning nanofiber electret filter material and its preparation, can solve the problems of space charge dissipation, charge performance attenuation, and electret performance failing to meet actual use requirements, etc.

Active Publication Date: 2015-01-21
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These patented technologies all use electret polymer materials under high-voltage electricity after heating or high-temperature treatment. Although they have a certain electret effect and can improve the stability of electret use to a certain extent, because the cooling process is natural cooling and It only drops to room temperature, resulting in the phenomenon of "depolarization" of polarized charges and the dissipation of space charges during the cooling process, and in the process of use, it is easily affected by environmental conditions and causes the charge performance to decay, resulting in the unsatisfactory electret performance. Actual use requirements

Method used

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  • Electrospinning nano-fiber electret filtering material and its preparation method
  • Electrospinning nano-fiber electret filtering material and its preparation method
  • Electrospinning nano-fiber electret filtering material and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0067] An electrospun nanofiber electret filter material and a preparation method thereof, the specific steps are:

[0068] The first step: Put the polyvinylidene fluoride powder in a vacuum oven at 80° C. and dry it under vacuum for 3 hours.

[0069] The second step: dissolve the dried polyvinylidene fluoride powder in N,N-dimethylformamide, and place the solution on a magnetic stirrer and stir for 10 hours to form a homogeneous solution; The mass fraction of polyvinylidene fluoride in the solution is 40%.

[0070] Step 3: Use figure 1 In the electrospinning equipment shown for spinning, a certain amount of the above-mentioned polyvinylidene fluoride polymer solution is drawn into the spinneret module 1, and the temperature control device 2 of the spinneret module is adjusted to 70°C for 20 minutes to make polymerization The object is evenly heated, and the distance from the spinneret of the spinneret to the receiving substrate is 15cm, and the applied voltage is 60kV.

[0071] Step...

Embodiment 2

[0073] An electrospun nanofiber electret filter material and a preparation method thereof, the specific steps are:

[0074] The first step: Place the polybutylene terephthalate particles in a vacuum oven at 50°C for vacuum drying for 1 hour.

[0075] Step 2: Add boehmite to a certain amount of dichloromethane, and sonicate for 4 hours, then add the dried polybutylene terephthalate particles into the dichloromethane solvent containing boehmite, and add the above solution Place it on a magnetic stirrer and stir for 12 hours to form a homogeneous solution; in the homogeneous solution, the mass fraction of polybutylene terephthalate is 20%, and the boehmite content is the total of polymer and inorganic nanoparticles. The amount is 3wt%.

[0076] Step 3: Use figure 1 In the electrospinning equipment shown in the spinning, a certain amount of the above-mentioned boehmite-containing polybutylene terephthalate polymer solution is pumped into the spinneret module 1 in the 10mL spinneret modu...

Embodiment 3

[0079] An electrospun nanofiber electret filter material and a preparation method thereof, the specific steps are:

[0080] The first step: the fluorinated polyurethane particles and polyethersulfone particles are placed in a vacuum oven at 70°C and 80°C, respectively, and dried under vacuum for 2 hours. Step 2: Add silsesquioxane to a certain amount of formic acid and DMF mixed solvent, and sonicate for 5 hours, then add the dried fluorinated polyurethane particles and polyethersulfone particles to silsesquioxane-containing formic acid and DMF In the mixed solvent, place the above solution on a magnetic stirrer and stir for 10 hours to form a homogeneous solution; in the homogeneous solution, the mass fraction of fluorinated polyurethane and polyethersulfone is 20%, and the mixing ratio of the two is 1:4, the content of silsesquioxane is 3wt% of the total amount of polymer and inorganic nanoparticles.

[0081] Step 3: Use figure 1 In the electrospinning equipment shown in spinnin...

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Abstract

The invention relates to an electrospinning nano-fiber electret filtering material and its preparation method. The high-efficiency and low-resistsance nano-fiber electret filtering material having no interfibrous adhesion and having a fluffy three-dimensional netted intercommunication structure is prepared through controlling the component and the temperatures of a polymer solution in an electrospinning process and carrying out one-step forming in the nano-fiber forming rapid cooling process, wherein the gram weight of the above nanofiber layer is 0.01-70g/m<2>, and the porosity is not less than 80%. The surface electrostatic potential of the nano-fiber electret filtering material is 800-6000V, and the surface charges have lasting storage stability, the hydrophobic angle is greater than 150DEG, the filtering efficiency of the material to particles of 0.006-1[mu]m can reach above 99.999%, the piezoresistance is less than 20Pa, and the dust containing capacity is 300-3600g/m<2>. The preparation method is simple, and the filtering material has wide application prospects in the fields of individual protection mouth mask filtration, indoor air purification and filtration, and high efficiency/ultrahigh efficiency air filtration.

Description

Technical field [0001] The invention relates to an electrospun nanofiber electret filter material and a preparation method thereof, in particular to an electrospun nanofiber electret filter material which can instantaneously cool down the polarization charge and space charge after the nanofiber is formed And its preparation method. Background technique [0002] High-performance electrospun nanofiber filter materials need to have the characteristics of high efficiency and low resistance, but conventional filter materials rely on the structural characteristics of the material itself (pore size, bulk density, etc.) to achieve effective filtration of particles, usually in high-efficiency At the same time, it also has a high piezoresistance, resulting in poor filtration performance. Therefore, it is difficult to achieve an effective balance of filtration efficiency and piezoresistance and the goals of high efficiency and low resistance only by the structural characteristics of the fib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/16D04H1/728B32B27/06B32B27/12
Inventor 丁彬赵兴雷王娜俞建勇
Owner DONGHUA UNIV
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