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Filter medium and composite filter comprising same

A filter medium and filter technology, applied in the direction of membrane filter, filter separation, dispersed particle filtration, etc., can solve the problem that the filter cannot pass the air normally, achieve excellent air filtration efficiency, prevent the reduction of air filtration performance, or Minimizes the effect of reducing air filtration performance

Pending Publication Date: 2022-03-04
AMOGREENTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] On the other hand, although existing filters using PTFE membranes have good water repellency, the filters do not trap a large amount of pollutants and cannot pass air normally.

Method used

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  • Filter medium and composite filter comprising same
  • Filter medium and composite filter comprising same
  • Filter medium and composite filter comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0128] Embodiment 1: the preparation of filter medium

[0129] The filter medium is prepared by sequentially stacking the first support body, the second support body and the PVDF nanofibrous web. An electrostatically treated polypropylene melt-blown non-woven fabric with an average pore size of 10 μm and an air permeability of 33 cfm, the above-mentioned second support body is formed by stacking a plurality of second fibers with an average fiber diameter of 20 μm and has 70 gsm Low-melting polyester thermally bonded non-woven fabric with a basis weight, an average pore size of 150 μm, and an air permeability of 836 cfm. The above-mentioned PVDF nanofiber web is formed by stacking a plurality of nanofibers with an average fiber diameter of 0.3 μm and has a base of 1 gsm. Heavy, 0.84μm average pore size and 10cfm air permeability.

Embodiment 2 to 25 and comparative example 1

[0131] In addition to changing the basis weight, average pore size, air permeability of the nanofibrous web, the basis weight of the first support, the average pore size, air permeability, and whether it is included or not, the rest are prepared in the same manner as in Example 1 above to prepare Filter media as shown in Tables 1 to 3 below.

experiment example

[0133] The following physical properties were evaluated for the filter media prepared according to Examples and Comparative Examples, and the results are shown in Tables 1 to 3 below.

[0134] 1. Measurement of pressure loss and filtration efficiency

[0135] For the filter media prepared according to Examples and Comparative Examples, the particle concentration is 20 ± 5mg / m under 95LPM conditions by an automatic filter tester (TSI 8130A-EN, U.S. TSI Company (TSI Incorporated)) 3 And the paraffin oil in the form of aerosol with an average particle diameter of 0.4 μm was filtered, and the pressure loss and filtration efficiency at this time were measured.

[0136] 2. Reduction rate of filtration efficiency

[0137] For the filter media prepared according to the examples and comparative examples, use the above-mentioned pressure loss and filtration efficiency measurement methods for continuous filtration for 5 hours, measure the filtration efficiency in units of 1 minute, and ...

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Abstract

The invention provides a filter medium. A filter medium according to one embodiment of the present invention comprises: a first support having a porous structure and electrostatically treated; and a nanofiber web disposed on one surface of the first support and formed by depositing nanofibers. Accordingly, the present invention has very excellent air filtration efficiency even with respect to fine dust having PM 2.5 or less, and furthermore can prevent or minimize a decrease in air filtration performance even if the use time is prolonged for a long period of time. Therefore, the filter medium and the composite filter according to one embodiment of the present invention can be widely used as a medium for filters for various air filtration devices.

Description

technical field [0001] The present invention relates to a filter medium, more specifically, to a filter medium and a composite filter including the filter medium. Background technique [0002] Melt blown-based filter media can reduce pressure loss and achieve high efficiency through electrostatic treatment, thus replacing the existing glass fiber (Glass Fiber) market. [0003] Despite these advantages of melt-blown filter media, the disadvantage of reducing efficiency in practical use has become a major problem. That is, there is a problem that the removal efficiency decreases due to the adhesion of dry dust (Dry Dust), wet dust (moisture and oil), etc. to the electrostatically treated fibers, or the reduction of electrostatic force due to humidity and temperature. Also, after about 6 months of use in an air purifier at home, the efficiency drops below 60%. When the melt-blown filter media treated with hydrocharging to have an efficiency of 99.97% (particles: 0.3 μm NaCl, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/16B01D46/00B01D46/52
CPCB01D39/1623B01D39/1692B01D46/52B01D39/16B01D39/1607B01D46/00B01D2239/065B01D2239/0435B01D2239/0618B01D2239/0627B01D2239/025B01D2239/1208B01D2239/0668B01D2239/0622B01D2239/1291B01D2239/0636B01D2239/0421B01D2239/0428B01D2239/1258B01D2239/1216A62B23/025B01D39/163B01D39/083B01D39/1615B01D2239/0266B01D46/0032B01D46/521
Inventor 李承勋曺俊根金灿金京秀张仙虎苏允美
Owner AMOGREENTECH CO LTD