KR101550758B1 - Filter media for fuel-water separation and manufacturing method thereof - Google Patents

Abstract

The present invention provides a filter material for an oil separation filter comprising a composite nonwoven fabric in which a kwon fiber and thermoplastic polymer fibers are mixed. The filter material for an oil-water separation filter according to the present invention overcomes morphological stability, which is a disadvantage of the cowwoven material, while using an environmentally-friendly cowwoven material, and also has excellent water-oil separation performance.

Description

TECHNICAL FIELD The present invention relates to a filter medium for an oil-water separation filter and a method of manufacturing the filter medium.

More particularly, the present invention relates to a filter material for an oil separation filter having excellent water-oil separating performance while overcoming morphological stability of a cowwoven material by mixing a cowwoven material and a thermoplastic polymer fiber, ≪ / RTI >

An oil-water separation filter is mounted on an engine for a vehicle such as an automobile, a ship or an airplane, and is used to remove moisture in the fuel. In particular, pulp and synthetic fiber filter media are used, and in particular, the development of an oil separation filter material using Kawan fiber has recently become an object of interest because it is eco-friendly.

For example, Patent Document 1 discloses a water-oil separation apparatus employing a lipophilic fibrous mat.

Patent Document 2 discloses a filter for removing oil mist using a multi-layered air filter having different densities, and a filter material of a low density layer at both ends of the filter material using a kawan fiber as a fiber material.

On the other hand, Patent Document 3 discloses a gear assembly including an enclosure using natural fibers such as a cowling as a fiber absorbent.

However, in the above-mentioned patent documents, it is the invention using the fiber material, in particular the `lipophilicity`, not the` water repellency` of the clay material, and also the use of the clay fiber in the form of bulk in the form of the fiber, There is a difficulty in realizing the water separation performance itself.

WO2001-026770A JP1999-090145A KR2009-0008235A

It is an object of the present invention to provide a filter material for an oil separation filter which is superior in oil separation performance while overcoming the morphological stability which is a disadvantage of the closure material by using an environmentally friendly material.

Another object of the present invention is to provide a method for manufacturing the filter material for an oil-water separation filter.

The present invention provides a filter material for an oil separation filter comprising a composite nonwoven fabric in which a kwon fiber and thermoplastic polymer fibers are mixed.

The horn ratio ratio of the above-mentioned kapok fiber and the thermoplastic polymer fiber is preferably from 10:90 to 70:30 by weight.

Wherein the thermoplastic polymer fiber is selected from the group consisting of polyethylene, polypropylene, polyethylene-polypropylene copolymer, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, LM-PET (low melting point polyester), nylon 6 and nylon 66 It is preferably a fiber obtained from at least one selected, and more preferably a polypropylene fiber or an LM-PET fiber.

Wherein the thermoplastic polymer fiber has a fineness of 1 to 20 denier; And an average fiber length of 30 to 100 mm.

The weight of the composite nonwoven fabric is preferably 50 to 300 g / m ² .

The composite nonwoven fabric may be formed by web-forming a mixture of the kwon fiber and the thermoplastic polymer fiber, carded and then bonded by needle punching or thermal bonding.

The composite nonwoven fabric may be densified by a belt press or a knife rendering.

Also, the present invention provides a filter material for an oil separation filter in which a fluorine resin nanofiber layer is formed on one side or both sides of a composite nonwoven fabric in which a kwon fiber and a thermoplastic polymer fiber are mixed.

The fluororesin may be at least one selected from the group consisting of tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-fluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene-ethylene copolymer (ETFE) One selected from the group consisting of ethylene-hexafluoropropylene-vinylidene fluoride terpolymer (THV), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVdF) and polychlorotrifluoroethylene (PCTFE) Or more.

The weight of the fluororesin nanofiber layer is preferably 1 to 20 g / m ² .

The nanofiber forming the nanofiber layer preferably has an average diameter of 100 to 500 nm.

The fluororesin nanofiber layer is preferably formed by electrospinning a fluororesin nanofiber on one surface of the composite nonwoven fabric.

Also, in the present invention, the first step of blending the kwon fiber and the thermoplastic polymer fiber at a weight ratio of 10:90 to 70:30; A second step of forming a web by carding after the hybridization; And a third step of fixing the formed web by needle punching or thermal bonding.

And a fourth step of performing belt press or calendering to increase densification after the third step.

After the fourth step, electrospinning of the fluorine resin nanofibers may be further performed on one surface of the composite nonwoven fabric.

The filter material for oil separator filter according to the present invention overcomes morphological stability which is a disadvantage of cowwoven material while using environmentally friendly cowwoven material and also has excellent oil water separation performance.

1A to 1D are SEM micrographs of the surface of the composite woven nonwoven fabric produced in Examples 3, 7, 11 and 15 in 1,000-fold magnification.
FIG. 1E is an SEM photograph (10,000 times) of the nanofibers electrospun on the surface of the composite nonwoven fabric of Example 15, and FIG. 1F is an SEM photograph (1,000 times) of the composite nonwoven fabric of Example 15.
FIG. 2 is a graph showing the results of water contact angle measurement for the composite nonwoven fabrics of Examples 1 to 3 and Comparative Examples 1 to 3. FIG.
FIG. 3A is a graph plotting the water separation efficiency of the composite nonwoven fabrics of Examples and Comparative Examples over time, and FIG. 3B is a graph plotting the water separation pressure difference over time.

[First embodiment]

One embodiment of the filter material for an oil-water separation filter provided by the present invention includes a composite nonwoven fabric in which a clathrate fiber and a thermoplastic polymer fiber are mixed.

The kapok fiber used as a component of the composite nonwoven fabric according to the present invention is also called a so-called Java fiber, which is a natural fiber obtained from the fruit of a cedarwood (Ceiba pentantra) Sumatra, India and Thailand. The composite woven fabric is water-repellent because it has a hollow shape and low cost and has a natural wax layer and is hydrophobic.

In the embodiment of the filter material for an oil-water separation filter according to the present invention, the natural fiber can be used as it is, or short fibers cut to a required length can be used.

On the other hand, the thermoplastic polymer fibers used as the other component of the composite nonwoven fabric according to the present invention maintains the nonwoven fabric shape and functions to prevent the nonwoven fabric from being broken or torn even under the pressure applied to the nonwoven fabric during the water separation process.

The thermoplastic polymer may be selected from, for example, polyolefin fibers such as polyethylene, polypropylene, polyethylene-polypropylene copolymer, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, poly Ester fiber, nylon 6, nylon 66, and the like. Preferably, polyolefin fibers having high strength and high hydrophobicity, among them polypropylene fibers or LM-PET fibers, are most preferred.

The thermoplastic polymer fibers preferably have a fineness of 1 to 20 denier. When the fineness is less than 1 denier, there is a problem that the pressure loss of the filter media is increased, and when the fineness is more than 20 denier, the web binding force may be decreased.

On the other hand, the thermoplastic polymer fibers are preferably short fibers having an average fiber length of 30 to 100 mm. When the fiber length is less than 30 mm, the carding property is decreased and it is difficult to manufacture the web. When the fiber length exceeds 100 mm, the fibers are bundled together and it is difficult to produce a nonwoven fabric having a uniform weight.

It is preferable that the horn ratio ratio of the kapok fiber and the thermoplastic polymer fiber of the composite nonwoven fabric is 10:90 to 70:30 by weight. If the content of the kwon fiber does not reach 10% by weight, the water repellency becomes poor and the function of oil-water separation is not exhibited. If it is more than 70% by weight, it tends to be fragile, and the density is low, so that the carding property is poor due to the nature of the capillary having a large acidity, so that the formation of the web is not easy and the production of the nonwoven fabric is difficult.

The weight of the composite nonwoven fabric is preferably 50 to 300 g / m ² . If the weight does not reach 50 g / m ² , the strength becomes weak, and if it exceeds 300 g / m ² , the pressure loss may increase.

[Second embodiment]

One embodiment of the filter medium for an oil-water separation filter provided by the present invention is a fluorine resin nanofiber layer formed on one side of a composite nonwoven fabric in which a cross-linked woven fabric and a thermoplastic polymer fiber are mixed.

In the second embodiment, the water repellency of the composite nonwoven fabric can be further improved by forming a fluororesin fiber layer on one surface or both surfaces of the composite nonwoven fabric according to the first embodiment. Further, by forming the fluororesin fiber layer with nanofibers, pores can be further reduced to improve water-oil separation performance.

The fluororesin may include, for example, tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-fluoroalkyl vinyl ether copolymer (PFA), trifluoroethylene-ethylene copolymer (ETFE) , Tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer (THV), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVdF) and polychlorotrifluoroethylene (PCTFE) ≪ / RTI >

The improvement in the water separation performance by the formation of the nanofiber layer depends on the weight per unit area of the layer to be formed and / or on the diameter of the unit nanofibers constituting the nanofiber layer. Specifically, in the second embodiment according to the present invention, the weight of the fluororesin nanofiber layer is 1 to 20 g / m ² ; The nanofiber forming the nanofiber layer preferably has an average diameter of 100 to 500 nm. When the weight is less than 1 g / m < ² > or the average diameter of the nanofibers is more than 500 nm, the improvement in oil-water separation performance is insignificant and there is no advantage of coating expensive fluororesin fibers. On the other hand, when the weight exceeds 20 g / m ² or the diameter of the nanofibers is less than 100 nm, the oil-water separating performance is improved, but the permeate flow rate becomes too small.

[Manufacturing method]

In addition, in the present invention, the first step of mixing the kwon fiber and the thermoplastic polymer fiber at a weight ratio of 10:90 to 70:30; A second step of forming a web by carding after the hybridization; And a third step of fixing the formed web by needle punching or thermal bonding.

The method for producing a filter medium for an oil-water separation filter according to the present invention is a so-called dry method in which an organic solvent or water is not essentially used.

As described above, the crosslinked fiber and the thermoplastic polymer that are mixed in the first step are as described above, and the method of blending can also be performed according to a known method.

The carding in the second step is a process of making the blended fiber assembly parallel to a certain level, thereby forming a thin web. The shape of the web obtained through the carding is in the form of a thin film-like sliver connected to each other between the constituent fibers while the fiber aggregates are arranged in the machine direction by the wires of the carding machine.

There is no particular limitation on the carding method that can be used in the carding process. For example, a carding method known in the art such as a roller card, a flat card, and a union card can be used.

The web formed through the carding machine is large in volume but very low in density. Therefore, when the nonwoven fabric is directly adhered thereto, the nonwoven fabric to be manufactured is too thin to reach the target weight. Therefore, a process of cross-lapping the webs as necessary may be added in accordance with the target weight of the nonwoven fabric.

The needle punching or thermal bonding performed in the third step is a method for manufacturing a nonwoven fabric by physically and / or thermally bonding the web through the punching or thermal bonding. When needle punching webs containing kawan fibers, the physical properties increase to a certain level of needle density, but after that, the physical properties may deteriorate. Particularly, in the manufacturing method of the present invention including the easily breakable cable, a two-step punching method is employed in which the needle punching is weakly bonded by pre-punching and then strongly bonded by main punching . In the manufacturing method of the present invention, it is preferable that punching is performed in a relatively weak condition because the folding of the folded fiber can be easily caused by needling due to the hollow property of the folded fiber. In the embodiments described below, the preliminary punching is performed at 500 to 300 times / min while the main punching is performed at 500 to 900 times / min. However, the present invention is not limited thereto. For example, the web may be thermally bonded through a double-belt press process without needle punching (LM-PET) depending on the type of yarn used.

In the manufacturing method according to the present invention, after the third step, a fourth step of densifying the composite nonwoven fabric produced may be added. High density of the composite nonwoven fabric can be performed by a belt press Double Belt Press (BP) or a calendering (CA) method. The belt press process is a process of passing a predetermined temperature and pressure through a nonwoven fabric fabricated between two upper and lower heating belts to increase the surface flatness of the nonwoven fabric and to have a dense structure. On the other hand, the knife rendering is a process for achieving high density by heating and pressing a nonwoven fabric while passing through two rotating heating rollers.

The fourth step is preferably performed so that the thickness of the composite nonwoven fabric before and after the process becomes 3/4 to 1/4 of the thickness before the process. In the densification process, when the thickness of the nonwoven fabric after the process becomes less than 1/4 of the pre-process thickness, the decrease in the permeation flow rate becomes large.

In the manufacturing method according to the present invention, after the fourth step, a fifth step of electrospinning the fluororesin nanofibers to one surface of the composite nonwoven fabric may be further included. Electrospinning is a known technique for producing nanofibers by combining a solvent and a polymer and then applying a high voltage to spin. After dissolving a solvent material suitable for the solvent and applying a high voltage, the solute in which the solvent is dissolved during spinning is radiated to a drum in which the composite nonwoven fabric is wound in the form of nanowires, and after a lapse of time, the nanofiber layer is formed by evaporation. By employing the electrospinning method as a means for forming the fluororesin nanofiber layer on one surface of the composite nonwoven fabric in the manufacturing method of the present invention, the composite nonwoven fabric layer and the fluororesin nanofiber layer formed of different fiber materials can be combined without a separate adhesive .

Hereinafter, the present invention will be described in more detail with reference to Examples. The present invention is intended to more specifically illustrate the present invention, and the scope of the present invention is not limited to these embodiments.

1. Preparation of filter media for oil-water separation filter

Examples 1 to 4

For the fabrication of composite nonwoven fabric for water repellency, Kawon fiber and PP fiber were blended at weight ratios of 1/9, 3/7, 5/5 and 7/3. The kapok fiber used in the examples was Javanese of Indonesia, having an average fiber length of about 18 to 32 mm and a diameter of 20 to 25 탆. A polypropylene (PP) staple fiber with a fineness of 2 denier and a fiber length of 51 mm was used for the manufacture of a composite nonwoven fabric by the dry process using the kraft cloth as the main raw material.

The mixed fibers were formed into a web using a card machine, cross-lapped, and then subjected to a needle punching (NP) process to produce a nonwoven fabric having a weight of 100 g / m ² . When needle punching a web containing a kerchief fiber, it is preferable to punch the web in a relatively weak condition because the hollow property of the kerchief fiber tends to break and the strength is weak. Therefore, in the embodiments of the present invention, preliminary punching is performed weakly at a rate of 300 times / min, and then main punching is performed at 500 to 900 times / min.

Examples 5 to 8

In order to maximize the water separation performance, the nonwoven fabrics prepared in Examples 1 to 4 were densified by a double belt press (BP) process. At this time, the belt press process was carried out under the following process conditions: belt pressure of 0 to 30 N / cm ² , line speed of 1.5 m / min, and temperature of 110 to 130 ° C.

Examples 9-12

In order to maximize the water separation performance, the nonwoven fabrics prepared in Examples 1 to 4 were densified by calendering (CA) process. The knife rendering was performed at a heating temperature of 110 캜, a roll pressure of 5 to 20 kgf / cm ² , and a line speed of 2.5 m / min.

Examples 13 to 15

In order to fabricate the composite nonwoven fabric for water repellency, Kawon fiber and LM-PET fiber were blended at a weight ratio of 3/7, 5/5 and 7/3. The kapok fibers used in the examples are the same as the kapok fibers used in Examples 1 to 4. [ LM-PET (low melt-PET, Huvis) bicomponent fiber, which is a binary binder fiber, has a fineness of 4 denier and a fiber length of 51 mm. The mixed fibers were formed into a web using a carding machine and cross-lapped to produce a weight of 70 g / m < ² >, followed by thermal bonding using a double belt press process. The temperature was 150 ~ 170 ℃ and the line speed was 4.0 m / min. The LM-PET fiber used as the binary binder is a low-melting-point polyester fiber and is easily melted at a temperature of 150 to 160 ° C. Therefore, the LM-PET fiber can be bonded to the kapok fiber as heat. Therefore, unlike Examples 1 to 4, The double belt press process was carried out and joined.

Examples 16 to 21

In order to maximize the water separation performance, polyvinylidene fluoride (PVDF) fibers were electrospun to the nonwoven fabrics prepared in Examples 5 to 8 to prepare composite nonwoven fabrics having nanofiber layers formed thereon. Electrospinning was performed by dissolving 25 to 29 wt% of a PVDF (Kynar) solution in a 7/3 wt% solution of dimethylacetamide / acetone = acetonitrile / acetone at a pressure of 15 kV, TCD 18 cm, needle gauge 21 and air pressure of 0.04 kPa. Electrospinning was conducted directly on the surface of the nonwoven fabric made from Kwangwon. At this time, the average diameter of the laminated nanofibers was 100 to 500 nm, and the weight of the nanofiber layer was 1 to 3 g / m ² .

Comparative Example 1

As a control, a polypropylene staple fiber having a fineness of 2 denier and a fiber length of 51 mm was used to form a web using a card machine, followed by cross-lapping, followed by a needle punching (NP) To prepare a nonwoven fabric having a weight of 100 g / m ² .

Comparative Example 2, Comparative Example 3

In Comparative Example 2, Comparative Example 1 was subjected to a high-density work through a belt press process under the same conditions as in Examples 5 to 8. In Comparative Example 3, nanofibers were laminated by electrospinning Comparative Example 2 under the same conditions as in Examples 16 to 21 in order to maximize water-oil separation performance.

Furtherance Mixing ratio Weight (g / m ² ) fair Example 1 Kapok / PP 1/9 100 NP Example 2 Kapok / PP 3/7 100 NP Example 3 Kapok / PP 5/5 100 NP Example 4 Kapok / PP 7/3 100 NP Example 5 Kapok / PP 1/9 100 Example 1 was subjected to BP machining Example 6 Kapok / PP 3/7 100 Example 2 was subjected to BP machining Example 7 Kapok / PP 5/5 100 Example 3 was subjected to BP machining Example 8 Kapok / PP 7/3 100 Example 4 was subjected to BP machining Example 9 Kapok / PP 1/9 100 Example 1 was subjected to CA processing Example 10 Kapok / PP 3/7 100 Example 2 was subjected to CA processing Example 11 Kapok / PP 5/5 100 Example 3 was subjected to CA processing Example 12 Kapok / PP 7/3 100 Example 4 was subjected to CA processing Example 13 Kapok / LM-PET 3/7 70 BP (thermal bonding) Example 14 Kapok / LM-PET 5/5 70 BP (thermal bonding) Example 15 Kapok / LM-PET 7/3 70 BP (thermal bonding) Example 16 Kapok / PP 1/9 100 Combination of Example 5 and ES Nanoweb  Example 17 Kapok / PP 3/7 100 Combination of Example 6 with ES Nanoweb Example 18 Kapok / PP 5/5 100 Combination of Example 7 and ES Nanoweb Example 19 Kapok / PP 7/3 100 Combination of Example 8 with ES Nanoweb Example 20 Kapok / LM-PET 5/5 70 Combination of Example 14 with ES Nanoweb Example 21 Kapok / LM-PET 5/5 70 Example 18 and the binding of ES nanowires Comparative Example 1 PP - 100 NP Comparative Example 2 PP - 100 Comparative Example 2 was subjected to BP processing Comparative Example 3 PP - 100 The binding of ES nanoweb with Comparative Example 2

2. Evaluation

2.1. Differential scanning electron microscope photograph

To observe the surface of the manufactured nonwoven fabric, 1,000 times magnification was observed using a scanning electron microscope (Hitachi S-4800).

1A to 1D are SEM micrographs of the surface of the polypropylene composite nonwoven fabric of Examples 3, 7, 11 and 18, which were prepared and processed in a weight ratio of 5: 5 with a ratio of 5: 5. Referring to Figs. 1A to 1D, it was confirmed that the hollow of the kapok fiber was flattened by the belt press and the knife rendering process, but was not broken. 1d showing the surface of the nonwoven fabric electrospun after the high-density processing, it can be seen that the surface of the nonwoven fabric is uniformly covered with the nanoweb.

1E is a SEM photograph (10,000 times) of nanofibers electrosprayed on the surface of the composite nonwoven fabric of Example 18. FIG. Referring to FIG. 1E, it is confirmed that the diameter of the nanofibers is approximately 100 to 500 nm.

Fig. 1F is an SEM photograph (1,000 times) of the kapok fiber of the composite nonwoven fabric of Example 18. Fig. From the above photograph, it is possible to confirm the diameter of the nanofiber by uniformly laminating the electrospun nanofibers on the surface of the casing.

2.2. Pore analysis

The pore size of the nonwoven fabric manufactured according to the ASTM F316 standard was measured using a capillary flow porometer (CFP-1200-AEL, PMI Inc.).

The pore size analysis results are summarized in Table 2. The pore size of Comparative Example 1 was measured to be about 22 to 33 mu m in the case of Examples 3, 7 and 11, and about 3 mu m in the case of Example 18 in which the electrospun web was introduced. Thus, when the nanoweb is introduced into the surface of the nonwoven fabric by electrospinning, the water separation performance will be improved by pore control.

Furtherance fair Average
Pore size (탆) maximum
Pore size (탆) Example 3 Kapok / PP = 5/5 NP 33.06 91.59 Example 7 Kapok / PP = 5/5 NP + BP 31.78 80.49 Example 11 Kapok / PP = 5/5 NP + CA 22.61 56.51 Example 18 Kapok / PP = 5/5 NP + BP + ES 2.91 6.39 Comparative Example 1 PP nonwoven fabric NP 109.13 189.72

2.3. Contact angle

The water - repellency and hydrophilic properties of the prepared kawan were measured by measuring the contact angle using a contact angle measuring device (DSA 100). Dosing volume was set to 2.

The results of the contact angle evaluation are summarized in Table 3 below, and FIG. 2 is a graph plotting the results of water contact angle measurement of the clay composite nonwoven fabric. Referring to these results, it was confirmed that the PP nonwoven fabric (Comparative Example 1) known to have excellent water repellency and lipophilicity was 133 °, and that all of the manufactured nonwoven fabrics were 140 ° or more, which was higher than that of the PP nonwoven fabric. And Example 7 and Comparative Example 2 were measured to be about 150 ° or more, and it was confirmed that the contact angle was improved through high-density machining. The nonwoven fabrics of Example 11 and Comparative Example 3 bonded to the nanoweb after high density processing had still hydrophobic and lipophilic properties of more than 140 ° although the contact angle was lower than that of the densified processed specimen.

Furtherance Mixing ratio Weight (g / m ² ) fair Contact angle (°) Example 3 Kapok / PP 5/5 100 NP 146.8 Example 7 Kapok / PP 5/5 100 Example 3 was processed by BP processing 160.0 Example 11 Kapok / PP 5/5 100 Combination of Example 3 and Nanobubbles 142.3 Comparative Example 1 PP nonwoven fabric - 100 NP 133.8 Comparative Example 2 PP nonwoven fabric - 100 Comparative Example 1 was subjected to BP processing 154.9 Comparative Example 3 PP nonwoven fabric - 100 Comparison of Comparative Example 2 with Nanoweb 140.9

2.4. Oil separation characteristics

The oil separation efficiency and the differential pressure were evaluated at 10, 20, 30, 40, 50 and 60 minutes according to ISO 16332 using a Fuel / water separation filter test standard (Bonavista technology Inc.). At this time, diesel oil was used as the test oil, H ₂ O concentration was set to 10,000 ppm, and the efficiency was calculated by the following equation (1).

Oil water separation efficiency = [(upstream side concentration - downstream side concentration) / downstream side concentration] × 100 (%) --- (1)

The filtration efficiency and the differential pressure of the nonwoven fabric of Kwon after 60 minutes of measuring the water separation performance are summarized in Table 4 below. FIG. 3A is a graph showing the water separation efficiency for the composite nonwoven fabrics of Examples and Comparative Examples, and FIG. 3B is a graph plotting the water separation pressure difference over time. 3A, and 3B, the water separation efficiency of Comparative Example 1 (PP nonwoven fabric), which is generally used as a water separation filter media, is excellent in water repellency and is measured to be 74.2%. Thus, in Examples 2, 3, 4, respectively.

Examples 3, 7, 11, and 18, in which the kappa and PP were mixed in a ratio of 5/5, showed that the efficiencies of Examples 5 and 6, which were high-density processed, were improved by about 7% Respectively. Particularly, in the case of Example 18 combined with the nanoweb after belt press processing, the differential pressure did not rise much even though the efficiency was measured as high as 99.9%. Also, in Example 20 in which the nano-web was bonded after 5/5 of the mixture of the kappa and the LM-PET was mixed, the efficiency was 99.9% And no increase in pressure loss due to the binding of the nanoweb occurred. From these results, it was confirmed that the PVDF nano - web bonding process after high - density process is effective for low differential pressure and high efficiency water - oil separation.

Furtherance Mixing ratio Weight (g / m ² ) fair efficiency
(%) Differential pressure
(mmH ₂ O) Example 1 Kapok / PP 1/9 100 NP 71.1 2.85 Example 2 Kapok / PP 3/7 100 NP 78.0 3.30 Example 3 Kapok / PP 5/5 100 NP 86.4 2.66 Example 4 Kapok / PP 7/3 100 NP 91.0 3.20 Example 7 Kapok / PP 5/5 100 Example 3 was subjected to BP machining 93.4 1.78 Example 11 Kapok / PP 5/5 100 Example 3 was subjected to CA processing 95.4 3.91 Example 14 Kapok / LM-PET 5/5 70 BP + CA 74.1 1.54 Example 18 Kapok / PP 5/5 100 Example 5
Combination of Nano Web 99.9 2.40 Example 20 Kapok / LM-PET 5/5 70 Example 14: Combination of Nanobubbles with Nanoparticles 99.9 1.29 Comparative Example 1 PP nonwoven fabric - 100 NP 74.2 2.18 Comparative Example 3 PP nonwoven fabric - 100 Comparison of Comparative Example 2 with Nanoweb 96.5 4.27

It is to be understood that the present invention is not limited to the above embodiments and various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims (17)

delete delete delete delete delete delete delete delete A filter medium for an oil-water separation filter for removing water in fuel,
Wherein the fluororesin nanofiber layer is formed on one surface or both surfaces of the composite nonwoven fabric in which the kwon fiber and the thermoplastic polymer fiber are mixed at a weight ratio of 10:90 to 70:30,
Wherein the weight of the fluorine resin nanofiber layer is 1 to 20 g / m ² , and the nanofiber forming the nanofiber layer has an average diameter of 100 to 500 nm
Filter media for oil - water separation filters. The fluororesin according to claim 9, wherein the fluororesin is at least one selected from the group consisting of tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-fluoroalkyl vinyl ether copolymer (PFA), trifluoroethylene- ETFE), tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer (THV), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVdF) and polychlorotrifluoroethylene (PCTFE) And at least one selected from the group consisting of water and oil. delete delete The filter material for an oil water separation filter according to claim 9, wherein the fluororesin nanofiber layer is formed by electrospinning fluorine resin nanofibers on one surface of the composite nonwoven fabric. Fusing the kwon fiber and the thermoplastic polymer fiber at a weight ratio of 10:90 to 70:30;
Forming a web by carding after the hybridization;
Fixing the formed web by needle punching or thermal bonding; And
A method for manufacturing a filter material for an oil water separating filter according to claim 9, comprising: electrospinning the fluorine resin nanofibers on one surface of the composite nonwoven fabric. 15. The method of claim 14, further comprising the step of densifying the belt pressing or calendering after the fixing step. delete The filter material for an oil water separation filter according to claim 9, wherein the thermoplastic fiber is a monofilament having a fineness of 1 to 20 denier and an average fiber length of 30 to 100 mm, and the composite nonwoven fabric has a weight of 50 to 300 g / m ² .

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