KR20140140888A - Microfilter, manufacturing method and manufacturing apparatus thereof - Google Patents

Abstract

The present invention provides a microfilter that has a large pore diameter of 1 to 30 μm and has a porous polymer layer with thickness of 1 to 30 μm formed on the surface of a fiber braid fabric, wherein the porous polymer layer is kept stable; a manufacturing method thereof; and a manufacturing device thereof. The microfilter comprises a fiber braid fabric composed of a plurality of filaments; and a porous polymer layer formed on the surface of the fiber braid fabric, having thickness of 1 to 30 μm and having a plurality of ventholes of 1 to 30 μm in size formed on an outer side surface.

Description

TECHNICAL FIELD [0001] The present invention relates to a microfilter, a method of manufacturing the same,

The present invention relates to a microfilter and a microfilter manufacturing method and apparatus, and more particularly, to a microfilter and a microfilter manufacturing method having a porous layer formed to a thickness of 1 to 30 μm on the surface of a fiber braid fabric, .

Referring to Patent Document 10-2007-0010666, it can be seen that the following method is generally used as a filtration method using a fiber braid fabric.

First, a textile material is woven in the form of a capillary or a turbular braid or screen, and then directly used as a filter medium to purify the liquid or gas .

There is also known a method of fabricating a fabric by weaving the fiber material in the form of a capillary or tubular braid or screen and then applying a substance such as diatomaceous earth or activated carbon to the surface of the fabric to form a cake .

There is a method in which a fibrous material is woven in the shape of a capillary or a tubular braid or screen, and then a porous layer using a polymer material is formed on the surface of the fabric and used as a filtration material.

However, the conventional method as described above has the following problems. First, when a textile material is woven in a capillary or tubular braid fabric or screen, and then directly used as a filter medium to purify liquid or gas, only particles of several tens of 탆 or more can be removed It is difficult to perform precise filtration and there is a problem that it is difficult to maintain the performance for a long time due to contamination of filter media and clogging of holes while removing particles.

Also, there is a method of refining a fluid by weaving the fibrous material in the form of a capillary or a tubular braid or screen, and then applying a substance such as diatomaceous earth or activated carbon to the surface of the fabric to form a cake In addition to the above-mentioned problems of microfiltration, it takes much time and expense to apply diatomaceous earth or the like for forming the active layer, and the treatment method is complicated. Moreover, since the active coating layer is thick, There is a problem that it is difficult to clean the city.

The filtration mechanism of the microfilter is a concept of DEPTH FILTRATION that occurs through the entire thickness of the filter medium, and the particles are removed by the compactness and micro-bending structure of the filter medium, the frictional force between the gap of the filter medium and the material to be filtered When the filter is contaminated, the filtered particles are discharged to the filtrate side, and since it is difficult to wash backwashing, it is necessary to replace the contaminated filter. Therefore, Cleaning, and discharge of environmental pollutants.

In order to solve such problems, a micro filter having a pore area of 1 to 30 μm has been developed, and it has been attempted to develop a micro filter which can be used repeatedly and repeatedly for a long period of time, and can be precisely filtered. However, in order to produce a filter having such a function of microfiltration, the concentration of the polymer as a main material in the raw material composition of the filter may be as low as usually 10% or less. When the filter is manufactured with such a composition, Since the strength is weak and spinning is not normally performed in the form of a hollow fiber, there is a problem that normal manufacture is impossible. In addition, when the coating is performed on the braid, it is difficult to maintain the strength due to the large pores of the formed porous layer, so that there is a problem that it is peeled off even when it is crushed or weak external impact.

Disclosure of the Invention The present invention has been made to solve the problems of the conventional filter described above, and it is an object of the present invention to provide a porous fiber layer having a large pore diameter of 1 to 30 탆 and a thickness of 1 to 30 탆, And to provide a microfilter in which pores are stably maintained, a manufacturing method thereof, and a manufacturing apparatus.

The present invention relates to a fiber braid fabric comprising a plurality of filaments; And a porous layer formed on the surface of the fabric braid fabric and having a thickness of 1 to 30 mu m and a plurality of through holes having a size of 1 to 30 mu m on its outer surface.

Preferably, the fabric braid fabric is selected from the group consisting of polyester, polypropylene, nylon, polysulfone, polyethersulfone, polyphenylene sulfide (PPS), poly acrylonitrile And may be made of any one material selected from the group consisting of polyetherimide, polyetheramide, polyamide, Carbone fiber and glass fiber, and the space between the filaments may be filled with a polymer material, and the porous layer may be made of polyvinylidene fluoride Polyvinylidene fluoride, polyethersulfone, polysulfone, polyacrylonitrile, polyimide, polyamideimide, polyurethane, polystyrene, , Polyacryl sulfone, ECTFE (Ethylene chloro-trifluoroethylene) and mixtures of the above-listed polymers or synthetic polymers It can be made of one material.

On the other hand, the present invention includes a first coating step of impregnating a fibrous braid fabric made of a plurality of filaments into a first polymeric material solution to impregnate a polymeric material into the fibrous braid fabric, A second coating step of impregnating the fiber braid fabric having passed through the first coating step with a second polymeric material solution having a higher concentration of polymeric material than the first polymeric material solution to form a polymer porous layer on the surface of the fiber braid fabric ; And a pore forming step of forming pores by cooling the polymer porous layer of the fiber braid fabric that has passed through the second coating step.

Preferably, the first polymeric material solution comprises 1 to 10% by weight of a polymeric material and 90 to 99% by weight of an aprotic solvent, and the above-mentioned elctric solvent is dimethylacetamide (DMAc ), Dimethylformamide (DMF), N-methylpyrrolidone (NMP), formamide, dimethylacrylmide (DMAD), gamma-butyrolactone, Dimethyl sulfoxide (DMSO), tetrachloroethane (TCE), and dioxane.

Alternatively, the first polymer material solution may be composed of 1 to 10% by weight of a polymer material and 0 to 50% by weight of a swellable poor solvent. The swelling poor solvent may be ethanol, methyl alcohol, And may be any one of Ethylacetate, Tetrahydrofurane, Methylethylketone, Methylcellosolve, Methylene chloride, Isophorone, and Acetone.

The solvent of the first polymer material solution may have a property of melting the fiber braid fabric, and the fiber braid fabric may include polysulfone, polyethersulfone, PPS (polyphenylene sulfide), PAN acrylonitrile, polyetheramide, polyamide, carbon fiber, and glass fiber.

The second polymeric material solution of the present invention may be 1 to 10% by weight of the polymeric substance and 90 to 99% by weight of the solvent, and the thickness of the porous layer is 1 to 10 탆, The microfilter may include the same polymer material as the second polymer material solution, and the microfilter having the fiber braid fabric and the polymer porous layer passed through the second coating step may be washed.

On the other hand, the invention relates to an unwinder for winding a fiber braid fabric and supplying the wound fiber braid fabric; A first coating unit coating the first polymer material solution on the fiber braid fabric supplied from the unwinder; A second polymer material solution formed on one side of the first coating part and having a higher polymeric substance concentration than the first polymeric material solution is coated on the surface of the fiber braid fabric that has passed through the first coating part, A second coating portion forming a polymer porous layer of ~ 30 mu m; The fiber braid fabric and the polymer porous layer formed on one side of the second coating part and passing through the second coating part are transferred into the water tank and coagulated to form pores having a size of 1 to 30 μm on the surface of the polymer porous layer part; Wherein the fiber braid fabric and the polymer porous layer that have passed through the pore forming portion are dipped in water to wash the surface of the fabric; And a rewinder for winding the fiber braid fabric on which the polymer porous layer washed in the above-mentioned specification is formed.

According to the present invention, it is possible to prevent the phenomenon of repeated cleaning and use, miniaturization, removal of particles, accumulation on the surface of the filter, and subsequent release to the filtrate, A filter and a manufacturing method thereof.

1 is a photograph of a surface of a porous layer according to an embodiment of the present invention.
2 is a partial cross-sectional view of a porous layer according to an embodiment of the present invention.
3 is an enlarged view of the portion "A" in Fig.
4 is a flowchart of a method of manufacturing a microfilter according to an embodiment of the present invention.
5 is a configuration diagram of a manufacturing apparatus that implements a method of manufacturing a microfilter according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

Referring to FIGS. 1 to 3, a microfilter according to an embodiment of the present invention includes a fiber braid fabric 10 and a polymer porous layer filter medium 20.

The fiber braid fabric 10 is composed of a plurality of filaments 11 and is made of polysulfone, polyethersulfone, PPS (polyphenylene sulfide), PAN (poly acrylonitrile), polyetheramide , And polyamide (polyamide). The fibrous braid fabric 10 is made of a material soluble in a solvent of a dope solution used for forming the polymer porous layer. When the polymer porous fabric layer 10 is formed, part of the fabric fiber braid is dissolved and bonded to the polymer porous layer The bonding force can be improved. In this embodiment, the fiber braid fabrics 10 may be coated with polysulfone, polyethersulfone, PPS (polyphenylene sulfide), PAN (polyacrylonitrile), polyetherimide, polyimide, , A carbon fiber, and a glass fiber. However, it is also possible to use a material used for a conventional braid such as a polyester, a polypropylene, or a nylon.

In addition, a space between the filaments 11 of the fiber braid fabric 10 is filled with a polymer material.

The polymer porous layer filter medium 20 is formed on the surface of the fiber braid fabric 10 and has a thickness of 1 to 30 μm and a plurality of pores 21 having a size of 1 to 30 μm on the outer surface thereof . Accordingly, since the polymer porous layer 100 has a large pore size of micro or more, it can be used repeatedly while being cleaned, and the phenomenon that the polymer porous layer 100 is discharged to the filtrate after the particle removal is advantageously suppressed.

The polymer porous layer 20 may be formed of at least one selected from the group consisting of polyvinylidene fluoride, polyethersulfone, polysulfone, polyacrylonitrile, polyimide, poly The polymer may be composed of any one of polyamideimide, polyurethane, polystyrene, polyacrylsulfone, ethylene chloro-trifluoroethylene (ECTFE) and a mixture of the polymers listed above or a synthetic polymer. have.

4 is a flowchart of a method of manufacturing a microfilter according to an embodiment of the present invention.

Referring to FIG. 4, a method of fabricating a microfilter according to an embodiment of the present invention includes a first coating step (S100) of infiltrating a first polymer material solution into a fiber braid fabric (10) A second coating step S200 of forming a polymer porous layer using a second polymer material solution, and a pore forming step S300 for forming pores in the polymer porous layer.

In the first coating step S100, a fiber braid fabric 10 made of a plurality of filaments 11 is impregnated with a first polymer material solution used as a dope solution so that a first polymer material solution is applied to the fiber braid fabric 10).

The first polymer material solution may be composed of 1 to 10% by weight of a polymer material and 90 to 99% by weight of an aprotic solvent. The above-mentioned elctric solvent can be selected from the group consisting of dimethylacetamide (DMAc), dimethylformamide (DMF), N-methylpyrrolidone (NMP), formamide, dimethylacrylmide DMAD), gamma-butyrolactone, dimethylsulfoxide (DMSO), tetrachloroethane (TCE), and dioxane.

Also, The first polymeric material solution may comprise 1 to 10% by weight of a polymeric material, 49 to 99% by weight of an efferent solvent, and 0 to 50% by weight of a swellable poor solvent. The swelling poor solvent may be at least one selected from the group consisting of ethanol, methyl alcohol, ethylacetate, tetrahydrofurane, methylethylketone, methylcellosolve, methylene chloride ), Isophorone, and acetone, and functions to prevent the fiber braid fabric from being excessively dissolved by the hydrophilic solvent.

The polymer material may be at least one selected from the group consisting of polyvinylidene fluoride, polyethersulfone, polysulfone, polyacrylonitrile, polyimide, polyamideimide, And is made of any one of polyurethane, polystyrene, polyacrylsulfone, ethylene chloro-trifluoroethylene (ECTFE), and a mixture of polymers listed above or a synthetic polymer.

The fiber braid fabric 10 may be formed of a material selected from the group consisting of polysulfone, polyethersulfone, polyphenylene sulfide (PPS), polyacrylonitrile (PAN), polyetheramide, polyamide, Glass fiber.

The solvent of the first polymeric material solution of the present embodiment comprises an aprotic solvent to partially dissolve the fiber braid fabric 10 and allow the polymeric material to infiltrate so that the binding force between the polymeric material and the fiber braid fabric . That is, since the solvent of the first polymer material solution dissolves a part of the fiber braid fabric, the fiber braid fabric and the polymer porous layer are bonded together after the micro filter is manufactured, .

In this embodiment, the fiber braid fabric is made of a material dissolvable by the solvent of the first polymer material solution. However, the fiber braid fabric is made of any one of polyester (polyesther), polypropylene, and nylon .

Also, in this embodiment, the first polymer material solution includes the polymer material at a low concentration of 1 to 10% so that the first polymer material solution penetrates deeply in the thickness direction of the fiber braid fabric.

In the second coating step S200, the fiber braid fabric 10 having passed through the first coating step S100 is impregnated with the second polymeric material solution to form a polymer porous layer 20 ).

The second polymer material solution has a higher concentration of the polymer material than the first polymer material solution. The second polymeric material solution may be composed of 3 to 15 wt% of a polymer material and 85 to 97 wt% of a solvent, and the thickness T of the polymer porous layer is 1 to 30 탆.

The second coating step may be performed by increasing the concentration of the polymer material in the second polymer material solution to a higher level than the polymer material in the first polymer material solution, The second polymer material solution is formed on the fabric to form a polymer porous layer. The polymer porous layer may be formed to a thickness of 1 to 30 탆, more preferably 1 to 10 탆.

The polymer material of the first polymer material solution and the polymer material of the second polymer material solution may be mixed in the same or the same solvent system.

In the pore forming step, the polymer porous layer formed on the surface of the fiber braid fabric is solidified to form large pores. The pores have a size of 1 to 30 mu m.

The microfilters according to the present embodiment have pores formed in the polymer porous layer with a large pore size of 1 to 30 占 퐉. Therefore, even when the air pressure at the level of 0.01 kg / cm2 to 0.2 kg / cm2 is well permeated, LMH (L / ㎡ hr), so the actual filtration pressure is very low, 0.05 ~ 0.5 ㎏ / ㎠. Therefore, the permeability of the microfilter is not significantly reduced by the operating pressure. Also, since the polymer porous layer is very thin and strongly adhered to the fiber braid fabric, it has an advantage that the strength is superior to that of the conventional fiber braid fabric reinforcing film.

Wherein the water washing step comprises passing the fiber braid fabric and the polymer porous layer through the pore forming system through a plurality of water tanks.

5, an apparatus 200 for fabricating a microfilter according to an embodiment of the present invention includes an unwinder 210, a first coating unit 230, a second coating unit 240, a pore forming unit 250, a numerical detail 260, and a rewinder 270.

The un-winder 210 is configured in a reel type, and a fabric braid fabric is wound around the outer periphery. The un-winder 210 feeds the wound fiber braid fabric to the first guide roller 220. The fabric braid fabric is transported to the first coating part 230 via the first guide roller 220.

The first coating part 230 coating the first polymer solution supplied from the first coating solution supply part 231 onto the braider 10. The first coating liquid supply unit 231 may include a gear pump for pumping and supplying the first polymer material solution.

The second coating part 240 is formed on one side of the first coating part 230 and coating the second polymeric material solution on the surface of the fiber braid fabric that has passed through the first coating part 230. The concentration of the second polymeric material solution is higher than that of the first polymeric material solution. The second polymeric material solution may be supplied from the second coating liquid supply unit 241 and the second coating liquid supply unit may include a gear pump for pumping and supplying the second polymeric material solution.

The fabric braid fabric coated in the second coating part 240 is transferred to the pore forming part 250.

The pore-forming unit 250 includes a water tank and a second guide roller 251 in which a space for receiving water is formed. The pore forming unit 250 coagulates the fiber braid fabric having the polymer porous layer formed thereon through the second coating unit to form pores of 1 to 30 μm on the surface of the polymer porous layer.

A fiber braid fabric having a polymer porous layer having pores formed in its surface in the pore forming part is conveyed to the male part (260). The water cistern is composed of a water wash tank filled with water. The fabric braid fabric passes through the water wash tank and is rewound to the rewinder 270 after the surface is washed with water.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: fiber braid fabric 11: filament
20: polymer porous layer 21: porous
100: Micro filter section 200: Micro filter manufacturing apparatus
210: unwinder 220: first guide roll
230: first coating part 240: second coating part
260: Number 270: Rewinder

Claims (18)

A fiber braid fabric comprising a plurality of filaments;
And a polymer porous layer formed on the surface of the fabric braid fabric and having a thickness of 1 to 30 mu m and a plurality of pores each having a size of 1 to 30 mu m on the outer surface. The method according to claim 1,
The fiber braid fabric may be made of a material selected from the group consisting of polysulfone, polyethersulfone, PPS (polyphenylene sulfide), PAN (poly acrylonitrile), polyetheramide, polyamide, CF (carbon fiber) (Glass fiber). The method according to claim 1,
Wherein a space between the filaments is filled with a polymer material. The method according to claim 1,
The polymer porous layer may include at least one selected from the group consisting of polyvinylidene fluoride, polyethersulfone, polysulfone, polyacrylonitrile, polyimide, polyamideimide, A microfilter made of a material selected from the group consisting of polyurethane, polystyrene, polyacryl sulfone and a mixture of the polymers listed above or a synthetic polymer. A first coating step of impregnating a fiber braid fabric made of a plurality of filaments into a first polymer material solution so that a polymer material penetrates a polymer material into the fiber braid fabric;
A second coating step of impregnating the fiber braid fabric having passed through the first coating step with a second polymeric material solution having a higher concentration of polymeric substance than the first polymeric material solution to form a polymer porous layer on the surface of the fiber braid fabric ;
And forming a pore by solidifying the polymer porous layer of the fiber braid fabric that has passed through the second coating step. The method of claim 5,
Wherein the first polymeric material solution comprises 1 to 10% by weight of a polymeric substance and 90 to 99% by weight of an aprotic solvent. The method of claim 6,
The above-mentioned elctric solvent is selected from the group consisting of dimethylacetamide (DMAc), dimethylformamide (DMF), N-methylpyrrolidone (NMP), formamide, dimethylacrylamide, Wherein the micro filter is one selected from the group consisting of DMAD, gamma-butyrolactone, dimethylsulfoxide (DMSO), tetrachloroethane (TCE), and dioxane. The method of claim 5,
Wherein the first polymeric material solution comprises 1 to 10% by weight of a polymeric material, 49 to 50% by weight of an aprotic solvent, and 0 to 50% by weight of a swellable poor solvent. The method of claim 8,
The swelling poor solvent may be at least one selected from the group consisting of ethanol, methyl alcohol, ethylacetate, tetrahydrofurane, methylethylketone, methylcellosolve, methylene chloride ), Isophorone, and acetone. ≪ RTI ID = 0.0 > 11. < / RTI > The method of claim 5,
The polymeric material may be selected from the group consisting of polyvinylidene fluoride, polyethersulfone, polysulfone, polyacrylonitrile, polyimide, polyamideimide, poly Wherein the polymer is selected from the group consisting of polyurethane, polystyrene, polyacryl sulfone and a mixture of the polymers listed above or a synthetic polymer. The method of claim 5,
Wherein the solvent of the first polymeric material solution has a property of melting the fiber braid fabric. The method of claim 11,
The fiber braid fabric may be a microfilter made of any one material selected from the group consisting of polysulfone, polyethersulfone, polyphenylene sulfide (PPS), poly acrylonitrile (PAN), carbon fiber (CF) Gt; The method of claim 5,
Wherein the fiber braid fabric is made of any one material selected from the group consisting of polyester, polypropylene, polyetheramide, and polyamide. The method of claim 5,
Wherein the second polymeric material solution comprises 1 to 10% by weight of a polymeric substance and 90 to 99% by weight of a solvent. The method of claim 5,
Wherein the thickness of the polymer porous layer is 1 to 10 mu m. The method of claim 5,
Wherein the first polymeric material solution comprises the same polymeric material as the second polymeric material solution. The method of claim 5,
And washing the fiber braid fabric and the polymer porous layer filter media that have passed through the second coating step. An unwinder winding the fiber braid fabric and feeding the wound fiber braid fabric;
A first coating unit coating the first polymer material solution on the fiber braid fabric supplied from the unwinder;
A second polymer material solution formed on one side of the first coating part and having a higher polymeric substance concentration than the first polymeric material solution is coated on the surface of the fiber braid fabric that has passed through the first coating part, A second coating portion forming a polymer porous layer of ~ 30 mu m;
The fiber braid fabric and the polymer porous layer formed on one side of the second coating part and passing through the second coating part are transferred into the water tank and coagulated to form pores having a size of 1 to 30 μm on the surface of the polymer porous layer part;
Wherein the fiber braid fabric and the polymer porous layer that have passed through the pore forming portion are dipped in water to wash the surface of the fabric;
And a rewinder for winding a fiber braid fabric on which the polymer porous layer washed in the above-mentioned details is formed.

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