TWI541060B - Ductile protective layer for covering filtered membrane filament and hollow membrane filament module for filtering - Google Patents

Description

a tough protective layer for coating a membrane filament for filtration and a hollow membrane filament module for filtration

The present invention relates to a toughness protective layer for coating a membrane filament for filtration and a hollow membrane filament module for filtration.

In recent years, according to different application fields, waste (sewage) water filtration, water purification filtration, seawater filtration, and the like. However, in various applications, the membrane filament has a certain service life according to its physical properties, as well as the operating environment and operating conditions.

For example, the membrane filament for filtration is subjected to a large pressure difference or stress during operation, and therefore special attention is paid to the physical properties of the membrane filament itself, such as strength, toughness and ductility. However, even if the membrane wire has better physical properties, in the high pressure difference or high stress environment, the membrane filament will still be broken, thereby greatly reducing the filtration efficiency. Therefore, there is a need for a method for effectively protecting the membrane filament for filtration to avoid breakage of the membrane filament, so that the filtration efficiency is not lowered by the filament breakage.

An object of the present invention is to provide a toughness protective layer for coating a membrane filament for filtration, which can enhance the toughness and ductility of the membrane filament for filtration, and avoid cracking or breaking of the membrane filament for filtration, and can increase the membrane filament for filtration. Service life.

One aspect of the present invention provides a tough protective layer for coating a membrane filament for filtration, the material of which is polyurethane (PU), ethylene vinyl acetate (EVA), thermoplastic rubber (thermoplastic) Rubber, TPR), polyolefin, epoxy resin or a combination thereof, wherein the polyurethane or epoxy resin has a Shore hardness of 5-20 D and a stretch ratio of 100% or more.

According to one or more embodiments of the present invention, the toughness protective layer has a Shore hardness of 5 to 20 D, and the toughness protective layer has a tensile ratio of 100% or more.

According to one or more embodiments of the present invention, the film filament for filtration is a cellulose-based material, a polyfluorene-based material, a polyolefin-based material, a fluorocarbon resin material, or a polyacrylonitrile-based material.

According to still another aspect of the present invention, a hollow film wire module for filtration includes a accommodating groove, a hollow film wire, and a fixing resin. The hollow membrane filament is inserted into the accommodating groove, and the hollow membrane filament has the aforementioned tough protective layer covering and contacting a part of the hollow membrane filament. The fixing resin is filled in the accommodating groove, and covers and contacts one portion of the tough protective layer and the tail end of the hollow film wire.

According to one or more embodiments of the present invention, the fixing resin comprises an epoxy resin, a polyurethane, or a combination thereof.

According to one or more embodiments of the present invention, another layer of ductile protective layer A part is not in contact with the fixing resin.

According to one or more embodiments of the present invention, the other portion of the ductile protective layer has a length of 0.5 to 4 cm.

According to one or more embodiments of the present invention, the hollow membrane filament is a plurality of hollow membrane filaments which are arranged substantially parallel to each other and separated from each other, and the fixing resin is filled between the portions of the tough protective layer of the hollow membrane filament.

According to one or more embodiments of the present invention, the hollow membrane filament is a plurality of hollow membrane filaments which are arranged substantially parallel to each other and adjacent to each other to form a bundle, and the fixing resin surrounds a portion of the bundled tough protective layer.

According to one or more embodiments of the present invention, the tough protective layer has a thickness of 0.05 to 0.20 mm.

In the above embodiment, since the toughness protective layer has good toughness and ductility, the filtration film covered by the tough protective layer is less likely to be cracked or broken, and the service life of the filtration film filament can be prolonged. Further, the tough protective layer can be further applied to the hollow film filament of the hollow film module for filtration. The tough protective layer can buffer the stress generated by the swing of the hollow membrane wire during aeration, and can avoid the hollow membrane filament from being broken, thereby improving the service life of the hollow membrane module.

The Summary of the Invention is intended to provide a simplified summary of the present disclosure in order to provide a basic understanding of the disclosure. This Summary is not an extensive overview of the disclosure, and is not intended to be an The basic spirit of the present invention and the technical means adopted by the present invention can be easily understood by those skilled in the art after referring to the following embodiments. Implementation.

1’‧‧‧Bundles

10‧‧‧Filter film

10'‧‧‧ hollow film wire

110‧‧‧Toughness protective layer

20‧‧‧ accommodating slots

30‧‧‧Fixed resin

L‧‧‧ Length of another part of the ductile protective layer

Part of the Pf1‧‧ hollow film

Pf2‧‧‧ hollow film end

Part of the Pp1‧‧‧ resilient protective layer

Another part of the Pp2‧‧‧ tough protective layer

t‧‧‧Thickness of the tough protective layer

Fig. 1 is a schematic view showing a film filament for filtration and a tough protective layer according to an embodiment of the present invention.

Fig. 2A is a side elevational view showing a hollow film filament module for filtration according to an embodiment of the present invention.

Fig. 2B is a schematic cross-sectional view showing the hollow film filament of Fig. 2A.

Fig. 3 is a view showing a state in which a hollow membrane is swayed in accordance with an embodiment of the present invention.

Fig. 4A is a side elevational view showing a hollow film filament module for filtration according to another embodiment of the present invention.

Fig. 4B is a schematic cross-sectional view showing the hollow film filament of Fig. 4A.

The description of the embodiments of the present invention is intended to be illustrative and not restrictive. The various embodiments disclosed herein may be combined or substituted with each other in an advantageous manner, and other embodiments may be added to an embodiment without further description or description.

In the following description, numerous specific details are set forth in the description However, there can be no such fine details Embodiments of the invention are practiced in the context of the section. In other instances, well-known structures are only schematically illustrated in the drawings in order to simplify the drawings.

In order to solve the problems described in the prior art, one aspect of the present invention provides a tough protective layer for coating a film filament for filtration. Fig. 1 is a schematic view showing a film filament 10 for filtration and a toughness protective layer 110 according to an embodiment of the present invention. The ductile protective layer 110 may partially or completely coat the film filament 10 for filtration. In one embodiment, as shown in FIG. 1, the tough protective layer 110 covers a part Pf1 of the filter filament 10 .

Since the toughness protective layer 110 has good toughness and ductility, the filter film 10 coated by the toughness protective layer 110 is not easily cracked or broken under high pressure difference or high stress, and the film for filtration can be extended. The service life of the wire 10.

In several embodiments, the material of the tough protective layer 110 is polyurethane (PU), ethylene vinyl acetate (EVA), thermoplastic rubber (TPR), polyolefin. An epoxy resin or a combination thereof, wherein the polyurethane or epoxy resin has a Shore hardness of 5-20 D and a stretch ratio of 100% or more. The polyolefin is, for example, polyethylene, polypropylene or the like. The foregoing material can form a toughness protective layer 110 having both toughness and ductility by adjusting the formulation and process conditions. In one embodiment, the toughness protective layer 110 has a Shore hardness of 5-20 D and an elongation ratio of 100% or more. In one embodiment, the toughness protective layer 110 has a stretch ratio of 400% or more. The ductile protective layer 110 has good ductility and stretchability.

In several embodiments, the filter filament 10 is a cellulose material. Materials, polyfluorene materials, polyolefin materials, fluorocarbon resin materials or polyacrylonitrile materials. The cellulosic material is, for example, a cellulose acetate (TCA) material. The polyfluorene-based material is, for example, a polyfluorene (PS) material or a polyether fluorene (PES) material. The polyolefin-based material is, for example, a polyethylene (PE) material or a polypropylene (PP) material. The fluorocarbon resin material is, for example, a polyvinylidene fluoride (PVDF) material or a polytetrafluoroethylene (PTFE) material. The polyacrylonitrile-based material is, for example, a polyacrylonitrile (PAN) material. Depending on the application field, the membrane 10 for filtration of different materials can be selected, and therefore the membrane filament 10 for filtration of the present invention is not limited to any one material.

In practical applications, the filter filament 10 can be used in any type of filtration equipment, such as water purification process equipment, sewage treatment equipment, air treatment equipment, and drinking water filtration equipment. In one embodiment, the filter filament 10 is a hollow membrane filament.

Yet another aspect of the present invention provides a hollow film wire module for filtration. Fig. 2A is a side elevational view showing a hollow film filament module for filtration according to an embodiment of the present invention. As shown in Fig. 2A, the hollow film module for filtration includes a accommodating groove 20, a hollow film wire 10', and a fixing resin 30.

Such hollow fiber membrane modules for filtration can be applied to water purification process equipment such as Continuous Membrane Filtration (CMF); sewage treatment equipment such as Membrane Bioreactors (MBR); air treatment equipment such as Membrane Distillation (MD); drinking water filtration equipment, such as water purifier filter.

In one embodiment, such a hollow film filament module for filtration is used in Membrane Bioreactors (MBR). The membrane bioreactor mainly comprises a biological reaction tank and a hollow membrane wire immersed in the biological reaction tank Module. When the sewage enters the biological reaction tank, the microorganisms in the biological reaction tank can decompose the organic matter in the sewage, and the hollow membrane wire of the hollow membrane wire module can block the solid matter in the biological reaction tank, and supply the liquid from the hollow membrane wire. The micropores of the surface penetrate into the hollow membrane filament and are filtered. Finally, the filtrate in the hollow membrane filament can flow into a water tube for recycling.

The trailing end of the hollow membrane filament 10' must be encapsulated and secured. The fixing resin 30 shown in Fig. 2A is for enclosing and fixing the hollow film filament 10'. Specifically, the hollow film filament 10' is inserted into the accommodating groove 20, and the fixing resin 30 is filled in the accommodating groove 20 to encapsulate one of the ends of the hollow film wire 10'. However, it is generally understood by those skilled in the art that both ends of the hollow film filament 10' can be packaged and secured.

The fixing resin 30 is required to have good curability and adhesion. In one embodiment, the fixing resin 30 comprises an epoxy resin, a polyurethane, or a combination thereof. In one embodiment, the epoxy resin has a Shore hardness of 80-90 D and an elongation of 5-10%. In one embodiment, the epoxy resin has a Shore hardness of 30-40 D and an elongation of 50-70%. However, those skilled in the art should know that an epoxy resin having a Shore hardness of 80-90D and a tensile ratio of 5-10% can be used simultaneously with a Shore hardness of 30-40D and an elongation ratio of 50-70. % epoxy resin. In one embodiment, the fixing resin 30 comprises two layers (not shown), the lower layer contacts the bottom of the accommodating groove 20 and the tail end of the hollow film wire 10', and the Shore hardness is 80-90D, and the stretching ratio is It is 5-10% epoxy; the upper layer is above the lower layer and contacts the hollow film filament 10', which comprises an epoxy resin having a Shore hardness of 30-40 D and a stretch ratio of 50-70%. In one embodiment, the polyurethane has a Shore hardness of 80-90 D and an elongation of 5-10%. In one implementation In the mode, the polyurethane has a Shore hardness of 30-40 D and an elongation of 50-70%. However, the present invention is not limited to the above embodiment.

During the filtration process, the hollow membrane filament 10' is aerated, and the hollow membrane filament 10' is oscillated to remove solid matter clogged on the surface of the hollow membrane filament 10'. During the aeration, the hollow membrane filament 10' may be stressed at the interface between the fixing resin 30 and the outside due to the wobble, and the hollow membrane filament 10' may be broken. However, since the hollow film filament 10' of the present invention has the tough protective layer 110, the stress generated at the boundary between the fixing resin 30 and the outside during the swing can be buffered, and the breakage of the hollow film filament 10' can be effectively prevented.

The ductile protective layer 110 covers and contacts a portion Pf1 of the hollow film filament 10'. The fixing resin 30 covers and contacts a portion Pp1 of the tough protective layer 110 and a trailing end Pf2 of the hollow film filament 10'. Therefore, the hollow film filament 10' can be encapsulated and fixed by the fixing resin 30, and is protected by the tough protective layer 110 at the boundary between the fixing resin 30 and the outside.

In the present embodiment, as shown in Fig. 2A, the hollow film filament 10' has a plurality of hollow membrane filaments 10' which are arranged substantially parallel to each other and separated from each other. The fixing resin 30 is filled between the portions Pp1 of the toughness protective layer 110 of the plurality of hollow film wires 10'. Fig. 2B is a schematic cross-sectional view showing the hollow film filament 10' of Fig. 2A. As shown in Fig. 2B, the hollow film wires 10' are separated from each other without contact, and the toughness protective layers 110 of the respective hollow film wires 10' are not in contact with each other.

In order to enable the hollow film filament 10' to be more completely protected, in one embodiment, the other portion Pp2 of the tough protective layer 110 is not in contact with the fixing resin 30, and further extends upward in the axial direction of the hollow film filament 10'. . In one embodiment, the length L of the other portion Pp2 of the tough protective layer 110 is 0.5. To 4 cm. As a result, even if the material of the fixing resin 30 is not yet solidified (that is, the material of the fixing resin 30 is flowing, such as a viscous liquid or a liquid state), it climbs up along the hollow film wire 10' due to capillary action, and does not Direct contact with the surface of the hollow film filament 10' makes the hollow membrane filament 10' hard and brittle and less able to withstand stress.

Fig. 3 is a view showing a state in which the hollow film filament 10' is oscillated according to an embodiment of the present invention. When the hollow film filament 10' is oscillated by the gas during the aeration process, the toughness protective layer 110 having high toughness and ductility can buffer the stress generated at the boundary between the fixing resin 30 and the outside when swinging, and can be The hollow film filament 10' is prevented from being broken, thereby prolonging the service life of the hollow film filament module.

Fig. 4A is a side elevational view showing a hollow film filament module for filtration according to another embodiment of the present invention. In the present embodiment, the hollow film filament 10' is a plurality of hollow membrane filaments 10' which are arranged substantially parallel to each other and adjacent to each other to form a bundle 1', and the fixing resin 30 surrounds a portion Pp1 of the tough protective layer 110 of the bundle 1'. .

Fig. 4B is a schematic cross-sectional view showing the hollow film filament 10' of Fig. 4A. The difference between the embodiment of the 4A-4B and the 2A-2B is that the hollow membrane wires 10' of the 4A-4B diagram are adjacent to each other, and the toughness protective layers 110 of the respective hollow membrane filaments 10' are in contact with each other to form a bond. A continuous shape of the tough protective layer 110.

The hollow film module shown in Fig. 4A can be formed by the following method. First, a plurality of hollow film wires 10' are aligned to form a bundle 1'. The material of the ductile protective layer 110 is then applied to the hollow film filament 10' of the bundle 1'. On the part Pf1, it is placed in the accommodating groove 20. Finally, the fixing resin 30 is poured into the accommodating groove 20, and is awaiting curing.

The following is a few examples (ie, Experimental Example 1, Comparative Example 1 and Comparative Example 2) to explain the method of the present invention in more detail, but it is for illustrative purposes only, and is not intended to limit the present invention. The scope defined in the patent application will be subject to the definition.

Experimental Example 1: Polyurethane (PU), ethylene vinyl acetate (EVA), thermoplastic rubber (TPR) having a Shore hardness of 5-20 D and a tensile ratio of 100% or more. ), polyolefin (polyolefin) and epoxy resin having a Shore hardness of 5-20D and a tensile ratio of 100% or more, respectively, coated on five sets of hollow film wires, and then hard epoxy resin ( Shore hardness of 80-90D, elongation rate of 5-10%) as a sealing glue for hollow film. Under the same conditions, according to the normal operating conditions, the projected area aeration is about 2m ³ /min. m ² , the hollow film module has no continuous fracture after one month of continuous operation.

Comparative Example 1: Only a hard epoxy resin (Shore hardness of 80-90 D, elongation: 5-10%) was used as a package fixing adhesive for hollow film. According to the normal operating conditions, the projected area aeration is about 2m ³ /min. m ² , within 30 hours, the hollow membrane filament is broken, which causes the hollow membrane filament module to continue to be used normally.

Comparative Example 2: Only a soft epoxy resin (Shore hardness of 30-40D, elongation rate of 50-70%) was used as a sealing adhesive for hollow film, and its projected area was aerated according to normal operating conditions. The amount is about 2m ³ /min. m ² , within 48 hours, the hollow membrane filament is broken, which causes the hollow membrane filament module to continue to be used normally.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

10‧‧‧Filter film

110‧‧‧Toughness protective layer

Part of the Pf1‧‧ hollow film

Claims (9)

A tough protective layer for coating a membrane filament for filtration, the material of the toughness protective layer being polyurethane (PU), ethylene vinyl acetate (EVA), thermoplastic rubber (TPR) And a polyolefin, an epoxy resin or a combination thereof, wherein the toughness protective layer has a Shore hardness of 5-20 D and a tensile ratio of 100% or more. The toughness protective layer according to claim 1, wherein the filtration membrane yarn is a cellulose material, a polyfluorene material, a polyolefin material, a fluorocarbon resin material or a polyacrylonitrile material. A hollow film module for filtration, comprising: a receiving groove; a hollow film wire inserted in the receiving groove, and the hollow film wire has the tough protective layer described in claim 1 and contacts the hollow film a portion of the wire; and a fixing resin filled in the receiving groove and covering and contacting a portion of the tough protective layer and a tail end of the hollow film. The hollow film module of claim 3, wherein the fixing resin comprises an epoxy resin, a polyurethane, or a combination thereof. The hollow film module of claim 3, wherein the other portion of the tough protective layer is not in contact with the fixing resin. The hollow film module of claim 5, wherein the other portion of the tough protective layer has a length of 0.5 to 4 cm. The hollow membrane module of claim 3, wherein the hollow membrane filament is a plurality of hollow membrane filaments arranged substantially parallel to each other and separated from each other, and the fixing resin is filled with the tough protective layers of the hollow membrane filaments. Between these parts. The hollow membrane module of claim 3, wherein the hollow membrane filament is a plurality of hollow membrane filaments arranged substantially parallel to each other and adjacent to each other to form a bundle, the fixing resin surrounding the tough protective layer of the bundle These parts. The hollow film module of claim 3, wherein the tough protective layer has a thickness of 0.05 to 0.20 mm.