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

A manufacturing method and filter technology, applied in membrane filters, chemical instruments and methods, separation methods, etc., can solve the problems of inability to ensure flow paths, damaged separation membranes, low durability, etc., and achieve excellent water permeability and durability. The effect of improving the hydrophilicity, prolonging the service life and improving the hydrophilicity

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

AI Technical Summary

Problems solved by technology

[0008] However, when the material of the separation membrane has strong hydrophobicity, it is not easy to be modified to be hydrophilic, and even if the separation membrane is modified to be hydrophilic, the flow rate cannot be increased to a desired level, and during use Medium hydrophilicity tends to disappear, so durability is low
[0009] Moreover, in the process of making the separation membrane hydrophilized, the pore structure of the separation membrane itself before hydrophilization, that is, the pore size and pore size, will change. The pore structure of the membrane changes so that the desired level of flow and separation efficiency cannot be achieved
[0010] Furthermore, when the filtration process is performed at high pressure or a higher pressure is applied in the backwashing process, the separation membrane is damaged, and the flow path cannot be secured due to the compression of the separation membrane, resulting in a problem that the flow rate is significantly reduced.

Method used

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

Examples

Experimental program
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Embodiment 1

[0117] First, to prepare a spinning solution, in 88 g of a mixed solvent of 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 solvent and moisture remai...

Embodiment 2～ Embodiment 18

[0124] 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 shown in following table 1, table 2 or table 3 in the same way as embodiment 1 aggregate.

experiment example 1

[0128] In the manufacturing process of the filter assembly according to the Examples and Comparative Examples, the following physical properties of the fiber web formed with the hydrophilic coating layer manufactured before bonding with the second support were evaluated, and the results are shown in Table 1 to Table 1. 3.

[0129] 1. Measuring the wetting angle

[0130]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 ...

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Abstract

A filter assembly is provided. A filter assembly according to an embodiment of the present invention is implemented so as to comprise: a filtration medium comprising a nanofiber, having a three-dimensional network structure, and having a fiber web layer comprising a hydrophilic coating layer that covers at least a part of the outer surface of the nanofiber; and a first support body that supports the filtration medium, which is provided on both surfaces thereof, and has a channel formed therein. Accordingly, the filtration medium has excellent chemical resistance and improved hydrophilicity such that the flow rate can increase substantially. In addition, the improved hydrophilicity is maintained for a long period of time such that the utilization period can be extended substantially. Furthermore, any change in the pore structure of the filtration medium during the hydrophilicity endowing process is minimized such that the initially designed physical characteristics of the filtration medium can be fully exhibited. Moreover, the channel is efficiently formed in spite of a high pressure applied during filtration and / or backwashing such that any reduction in the flow rate is prevented,any damage to the membrane is minimized, and the resulting filter assembly 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 assembly, and more specifically, to a filter assembly having excellent water permeability and good durability, and ensuring mechanical strength capable of withstanding high pressure due to backwashing, and its manufacture method and the filter modules that include it. 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 forme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/16B01D39/08B01D35/30
CPCB01D35/30B01D39/08B01D39/16B01D67/0006B01D69/125B01D2323/30B01D2323/39B01D67/0088B01D2323/21826B01D2323/21827B01D67/00042B01D69/1213B01D71/381B01D69/1071B01D39/083B01D39/1623B01D2201/0415B01D69/02B01D2323/02B01D2325/36
Inventor 丁义荣徐寅踊
Owner AMOGREENTECH CO LTD
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