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Composite nanofiber air filtration material and preparation method thereof

An air filter material and composite nanofiber technology, which is applied in the field of composite nanofiber air filter material and its preparation, can solve the problems of composite membranes not being tightly bonded, poor filtering effect, and high airflow resistance, and achieve tight composite membrane bonding and airflow resistance Low, small pressure drop effect

Inactive Publication Date: 2016-03-30
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a new type of composite nanofiber to overcome the defects of small specific area, low dust holding capacity, high airflow resistance, loose combination of composite membranes and poor filtering effect in the air filter materials in the prior art. Air filter material and its preparation method, the material has the advantages of large specific area, high dust holding capacity, low air flow resistance, tight combination of composite membranes, and good filtering effect

Method used

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  • Composite nanofiber air filtration material and preparation method thereof
  • Composite nanofiber air filtration material and preparation method thereof
  • Composite nanofiber air filtration material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The polyvinyl alcohol (PVA) powder that takes by weighing 1.8g is dissolved in 18.2g deionized water, and accelerates dissolving under 90oC constant temperature magnetic stirring, the PVA spinning solution that the preparation obtains mass percentage is 9%; Weighs 1.4g polyacrylonitrile ( PAN) (molecular weight: 90,000) powder was dissolved in 18.6g of dimethylformamide solvent, and the dissolution was accelerated under constant temperature magnetic stirring at 70°C to prepare a PAN spinning solution with a mass percentage of 7%.

[0022] Pour the above-mentioned PVA spinning solution and the PAN spinning solution into the liquid storage cylinders communicating with the two spinning nozzles 1 and 2 respectively (such as figure 1 Shown), the nozzle place is connected with copper wire, and the 300 mesh stainless steel wire mesh is placed on the metal receiving cylinder 5. First open the PVA spinning solution separately for spinning, the spinning voltage is 10KV, the spinn...

Embodiment 2

[0026] By the way of Example 1, the difference is that 2.4g of PVA powder is dissolved in 17.6g deionized water to make a PVA spinning solution with a mass percentage of 12%; 2.4g of PAN (molecular weight is 80,000) powder is dissolved in 17.6g In the dimethylformamide solvent, the PAN spinning solution with a mass percentage of 12% was prepared. Other processing conditions are all with embodiment 1. A composite fiber air filter material with a dense structure and stable performance is obtained with a thickness of 65 μm. Among them, the diameter of PVA fiber is 940±35nm, and the diameter of PAN fiber is 415±30nm. image 3 It is the surface electron microscope scanning picture of the composite nanofiber air filter material.

[0027] The complete porosity of the composite nanofiber air filter material is 76.2%, the average pore diameter is 4.20 μm, the filtration efficiency of NaCl aerosol with a number median diameter of 75nm reaches 99.98%, and the pressure drop is 560Pa.

Embodiment 3

[0029] According to Example 1, the difference is that 2.8g of PVA powder is dissolved in 17.2g of deionized water to obtain a PVA spinning solution with a mass percentage of 14%; 2.8g of PAN (molecular weight is 90,000) powder is dissolved in 17.2 In g dimethylformamide solvent, a PAN spinning solution with a mass percentage of 14% was prepared. Other processing conditions are all with embodiment 1. A composite nanofiber air filter material with a dense structure and stable performance is obtained with a thickness of 85 μm. Among them, the diameter of PVA fiber is 950±50nm, and the diameter of PAN fiber is 392±45nm. Figure 4 It is a scanning electron microscope picture of the composite fiber air filter material.

[0030] The composite nanofiber air filter material has a complete porosity of 86.2%, an average pore diameter of 5.50 μm, a filtration efficiency of 99.97% for NaCI aerosols with a median diameter of 75 nm, and a pressure drop of 516 Pa.

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Abstract

The invention relates to a composite nanofiber air filtration material and a preparation method thereof. The material comprises a nanometer polyvinyl alcohol fiber layer and an interweaving layer of nanometer polyvinyl alcohol fibers and polyacrylonitrile fibers, the air filtration material in the four layer structure of the nanometer polyvinyl alcohol fiber layer and the interweaving layer of the nanometer polyvinyl alcohol fibers and the polyacrylonitrile fibers in cross distribution is obtained through one-time electrostatic spinning, the diameter of the polyvinyl alcohol fiber layer ranges from 400 nm to 1,000 nm, the diameter of the electrostatic spinning polyacrylonitrile fibers ranges from 150 nm to 500 nm, the porosity ranges from 75% to 90%, the average pore size ranges from 0.4 mu m to 6 mu m, and crosslinking treatment is performed. The performance that the composite nanofiber air filtration material is not prone to layering and better mechanical properties can be obtained, the filtration efficiency to NaCl aerosol with number median diameter of 75 nm ranges from 99.94% to 99.99%, and the pressure is reduced to be 180-600 Pa. The material is particularly suitable for fields such as personal protective products, air quality testing equipment and air purification devices.

Description

technical field [0001] The invention relates to an air filter material, in particular to a composite nanofiber air filter material and a preparation method thereof. Background technique [0002] With the development of industrialization, the pollution of the environment and air is further intensified. The dust in the air seriously endangers human health, so it must be filtered and purified. In addition, high-precision work areas such as: ultra-clean rooms, air purification is also essential . The method of air filtration can separate and trap the particles dispersed in the air. The electrospinning method can prepare a porous fiber membrane with a diameter of tens or hundreds of nanometers. The fiber membrane has a large specific surface area and a high porosity, which is very suitable for use as a filter material. Shin et al. prepared a glass fiber / nanofiber composite filter material. Adding a small amount of nanofiber can improve the collection efficiency of the glass fib...

Claims

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Application Information

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IPC IPC(8): B01D39/16D04H1/545D04H1/548D04H1/559D04H1/728D06M13/123D06M101/24D06M101/28
CPCB01D39/1623B01D2239/025B01D2239/1208B01D2239/1216D04H1/545D04H1/548D04H1/559D04H1/728D06M13/123D06M2101/24D06M2101/28D10B2505/04
Inventor 滕博程志强冯青杰文连姬童卫芳王三春葛敏赵丽晶张学磊
Owner JILIN UNIV
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