Filter medium, method for manufacturing same, and filter module comprising same

A filter medium and manufacturing method technology, applied in membrane filters, separation methods, filtration and separation, etc., can solve the problems of inability to increase flow, easy disappearance of hydrophilicity, poor permeability, etc., to prolong the service life and improve the hydrophilicity. , improve the effect of traffic

Active Publication Date: 2019-01-15
AMOGREENTECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, when the material of the separation membrane has strong hydrophobicity, the permeability of the coating composition such as water is poor, and even if the separation membrane having hydrophobicity is modified to have increased hydrophilicity, the flow rate cannot be increased. To the desired level, the hydrophilicity imparted by modification also tends to disappear during water treatment, making it difficult to sustain the initial flow
[0009] Also, the pore structure of the separation membrane initially designed to achieve the desired flow rate and separation efficiency, that is, the pore size and pore size, may change during the hydrophilization process, so the flow rate and separation efficiency at the originally designed level may not be exhibited

Method used

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  • Filter medium, method for manufacturing same, and filter module comprising same
  • Filter medium, method for manufacturing same, and filter module comprising same
  • Filter medium, method for manufacturing same, and filter module comprising same

Examples

Experimental program
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Embodiment 1

[0095] First, in order to prepare a spinning solution, in 88 g of a mixed solvent obtained by mixing dimethylacetamide and acetone at a weight ratio of 70:30, 12 g of polyfluorescein, which is a fiber-forming component, was melted at a temperature of 80° C. using a magnetic bar. Ethylene difluoride (Arkema, Kynar 761) was dissolved for 6 hours to prepare a mixed solution. The above-mentioned spinning solution was put into the solution tank of the electrospinning device, and discharged at a rate of 15 μl / min / hole. At this time, the temperature in the spinning zone was kept at 30° C., the humidity was kept at 50%, and the distance between the collector and the tip of the spinning nozzle was 20 cm. Then, a voltage of more than 40kV was applied to the spinning nozzle assembly (SpinNozzle Pack) using a high voltage generator, and an air pressure of 0.03MPa was applied to each spinning assembly nozzle to prepare a fiber web layer formed by PVDF nanofibers. Then, in order to dry the...

Embodiment 2～ Embodiment 18

[0101] Except changing the component etc. of hydrophilic coating composition as shown in following table 1, table 2 or table 3, all the other make the filter medium shown in following table 1, table 2 or table 3 in the same way as embodiment 1 .

experiment example 1

[0105] The following physical properties of the filter media according to Examples and Comparative Examples were evaluated, and the results are shown in Tables 1 to 3 below.

[0106] 1. Measuring the wetting angle

[0107]A contact angle (Contact angle, °) measuring device is used to measure the contact angle formed by the surface of the fiber web layer and the surface of the water drop to measure the wettability (wettability) of water on the exposed surface of the fiber web layer. A method of photographing the shape of a droplet with a CCD camera and calculating the interfacial tension γ optimized for the last photographed droplet shape was used. Adjust the injection volume to 0.05 mL via a microsyringe and use double distilled water. The contact angle was measured within 20 seconds after the droplet was formed at five points on the surface of the fiber web layer, and the average value thereof and the average deviation according to Mathematical Formula 1 above were calculate...

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Abstract

A filter medium is provided. A filter medium according to an embodiment of the present invention comprises: a fiber web layer of a three-dimensional network structure including nanofiber; and a hydrophilic coating layer which covers at least a part of the outer surface of the nanofiber. According to this, a flow rate can be remarkably increased due to the improved hydrophilicity of the filter medium. Also, as the improved hydrophilicity is maintained for a long period of time, the lifespan can be remarkably prolonged. Furthermore, since the modification of a porous structure of the filter medium is minimized during the process of hydrophilization so that the initially designed physical properties of the filter medium can be exhibited in its entirety, the filter medium having chemical resistance, excellent water permeability and durability can be variously applied in the water treatment field.

Description

technical field [0001] The present invention relates to a filter medium, and more particularly, to a filter medium having excellent water permeability and good durability, a manufacturing method thereof, and a filter module including the same. Background technique [0002] Separation membranes can be classified into microfiltration membranes (micro filter, MF), ultrafiltration membranes (ultrafilter, UF), nanofiltration membranes (nano filter, NF) or reverse osmosis (reverse osmosis, RO) membranes according to the pore size. [0003] Although the separation membranes exemplified above are different in use and pore size, they have in common that the above separation membranes are in the form of a filter medium formed of fibers or a porous polymer filter medium or a membrane having a combination thereof. [0004] Generally, in the above-mentioned porous polymer filter medium, it is formed in a polymer membrane or a polymer hollow fiber by using a separate pore-forming agent co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/16B01D63/08B01D69/10B01D71/32B01D71/34D01F8/00D04H1/4318D04H1/54D04H1/728
CPCB01D63/08B01D71/32B01D71/34D04H1/728B01D63/067B01D2323/02B01D2323/30D04H1/587D04H1/64B01D67/0088B01D71/38B01D2323/39B01D2325/36B01D39/1623B01D2239/025B01D2239/0421B01D2239/1208B01D2239/1233B01D2239/065B01D2239/0654D01D5/0084D06M15/333D01D5/0038D01F6/12D06M2101/22B01D2321/281B01D67/00042B01D69/1411B01D69/10D04H1/4318D04H1/54B01D2239/0471B01D67/0002B01D69/02D01D5/003D01F8/06D04H1/558B01D2325/02D06M2101/26D10B2321/021D10B2321/022D10B2401/021D10B2401/022D10B2505/04D01F8/00B01D71/381B01D2325/0283B01D69/1071
Inventor 丁义荣徐寅踊
Owner AMOGREENTECH CO LTD
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