KR101521600B1 - Filter including polyvinylidene fluoride nanofiber and bicomponent substrate and its manufacturing method - Google Patents

Abstract

The present invention relates to a filter including a polyvinylidene fluoride nanofiber and a two-component base material, and a method for producing the same. The two-component base material, the polyethylene terephthalate base material, and the second two- A polyvinylidene fluoride nanofiber nonwoven fabric laminated by electrospinning a solution prepared by mixing a high melting point polyvinylidene fluoride and a low melting point polyvinylidene fluoride, and a process for producing the same.
In the present invention, the low melting point polyvinylidene fluoride acts as an adhesive between the substrate and the nanofibers in the heat-sealing process of the filter, thereby preventing the nanofiber nonwoven fabric from being separated from the substrate.

Description

FIELD OF THE INVENTION The present invention relates to a filter including polyvinylidene fluoride nanofibers and a bicomponent base material,

The present invention relates to a filter including a nanofiber and a method of manufacturing the same, and more particularly, to a filter comprising a nanofiber and a method of manufacturing the same. The filter comprises a nanofiber, A filter including polyvinylidene fluoride (PVDF) nanofibers prepared by electrospinning a solution of polyvinylidene fluoride having a molecular weight of 50,000 and polyvinylidene fluoride having a weight average molecular weight of 5,000, And a manufacturing method thereof.

In general, filters are classified as liquid filters and air filters as filtration devices for filtering foreign matter in a fluid. Among these, the air filter has been developed in order to prevent the defects of high-tech products with the development of high-tech industries, and to manufacture semiconductor devices, assemblies of computers, hospitals, It is used in food processing factories, agriculture and forestry fisheries field, and is widely used in dusty workshop and thermal power plant. A gas turbine used in a thermal power plant sucks compressed air from the outside and compresses it, then injects the compressed air into the combustor together with the fuel, mixes the mixed air and fuel, and burns the high temperature and high pressure combustion gas And is then injected into the vanes of the turbine to obtain rotational power. Because these gas turbines are made up of very precise parts, they are periodically serviced and use air filters for pretreatment to purify the air in the air entering the compressor.

 The air filter is capable of supplying purified air by preventing foreign substances such as dust and dust contained in the air from permeating into the filter filter material when the combustion air sucked into the gas turbine is taken in the air. However, particles having a large particle size accumulate on the surface of the filter media, forming not only a filter cake on the surface of the filter media, but also accumulating fine particles in the filter media, thereby blocking the pores of the filter media. As a result, when the particles are accumulated on the surface of the filter media, there is a problem of increasing the pressure loss of the filter and decreasing the service life.

 On the other hand, in the conventional air filter, the principle that the static electricity is applied to the fibrous aggregate constituting the filter medium to collect the particles by the electrostatic force is used, and the efficiency of the filter by the above principle has been measured. However, the European air filter classification standard EN779 recently decided to exclude the filter efficiency due to the electrostatic effect in 2012. As a result of measuring the efficiency by excluding the electrostatic effect, the actual efficiency of the filter is lowered by more than 20% It turned out.

In order to solve the above-mentioned problems, various methods of manufacturing nano-sized fibers and applying them to filters have been developed and used. When the nanofibers are implemented in a filter, the nanofibers have a larger specific surface area than the conventional filter media having a large diameter, are flexible to the surface functional groups, and have a nano-sized pore size, thereby enabling fine dust particles to be efficiently filtered. The implementation of the filter using nano-sized fibers causes a problem that the production cost is increased, and it is not easy to control various conditions for production, and it is difficult to mass-produce the filter. Therefore, Which caused the problem of not being able to produce and distribute at low unit prices. In addition, conventional techniques for spinning nanofibers are limited to small-scale operation lines focused on laboratories, and there has never been introduced a radiation segment as a unit concept. In addition, when the nanofibers are produced by applying the nanofibers to the filter, there arises a problem that separation occurs between the nanofibers and the substrate of the filter.

Disclosure of the Invention The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method for producing a polymer electrolyte membrane by electrospinning a solution of polyvinylidene fluoride having a weight average molecular weight of 50,000 and polyvinylidene fluoride having a weight average molecular weight of 5,000, The present invention also provides a filter manufactured by laminating a polyvinylidene fluoride nanofiber nonwoven fabric on both sides of a substrate laminated with a polyethylene terephthalate base material and a second two-component base material, and a method for producing the same.

As described above, in the process of forming the polyvinylidene fluoride nanofiber nonwoven fabric on both sides of the substrate laminated with the first two-component substrate, the polyethylene terephthalate substrate, and the second two-component substrate, a process of rotating the fabric up and down 180 ° It is an object of the present invention to manufacture a filter capable of mass production by introducing a unit concept into an electrospinning device, which can simplify the manufacturing process.

According to a preferred embodiment of the present invention, a polyethylene terephthalate base material, a first binary material base laminated on one side of a polyethylene terephthalate base material, a polyvinylidene fluoride having a weight average molecular weight of 50,000 and a weight average A solution of polyvinylidene fluoride having a molecular weight of 5,000 is electrospun and is laminated to form a first polyvinylidene fluoride nanofiber nonwoven fabric and a second polyvinylidene fluoride nanofiber nonwoven fabric laminated on the other side of the polyethylene terephthalate base 2 binary material, a second binary material, and a solution prepared by mixing polyvinylidene fluoride having a weight average molecular weight of 50,000 and polyvinylidene fluoride having a weight average molecular weight of 5,000 are electrospun, and a second polyvinylidene Comprising a fluoride nanofiber nonwoven fabric and comprising a polyethylene terephthalate substrate, The present invention provides a filter comprising a polyvinylidene fluoride nanofiber and a two-component base material, wherein the first and second binary components and the first and second polyvinylidene fluoride nanofiber nonwoven fabrics are thermally fused. Wherein the first polyvinylidene fluoride nanofiber nonwoven fabric has a fiber diameter of 150 to 300 nm and the second polyvinylidene fluoride nanofiber nonwoven fabric has a fiber diameter of 100 to 150 nm, The substrate is characterized by being a sheath-core type, a side by side type and a C-type type. The sheath portion of the sheath-core type two-component substrate has a low melting point Polyester, and the core portion is a high melting point polyethylene terephthalate.

According to another preferred embodiment of the present invention, a flushing liquid main tank is independently connected to a nozzle of a nozzle block located in the unit, the flushing device rotating the fabric between the units is provided, A manufacturing method for producing a filter by an electrospinning device for electrospinning a polymer spinning solution on a substrate placed in a collector of each unit, the method comprising the steps of: mixing polyvinylidene fluoride having a weight average molecular weight of 50,000 and poly A step of injecting a spinning liquid in which vinylidene fluoride is dissolved in a solvent into a feeding device of each unit, a step of stacking the first two-component substrate, the polyethylene terephthalate substrate, and the second two- The polyvinylidene fluoride solution is electrospun on the first two-component substrate of the substrate, Lid fluoride nanofiber nonwoven fabric laminated on the first unit, the first polyvinylidene fluoride nanofiber nonwoven fabric, the first two-component substrate, the polyethylene terephthalate-based member, the second two- Minute, the spinning liquid is electrospun on the second biaxial substrate which is not bonded to the polyethylene terephthalate base material in the second unit of the electrospinning device Forming a second polyvinylidene fluoride nanofiber nonwoven fabric by laminating a first polyvinylidene fluoride nanofiber nonwoven fabric, a first polyvinylidene fluoride nanofiber nonwoven fabric, a second polyvinylidene fluoride nanofiber nonwoven fabric, and a second polyvinylidene fluoride nanofiber nonwoven fabric, And a step of thermally fusing the fabric laminated in this order to the nonwoven fabric It provides a polyvinylidene fluoride nanofibers and two-component method of manufacturing a filter comprising a substrate. Wherein the first polyvinylidene fluoride nanofiber nonwoven fabric has a fiber diameter of 150 to 300 nm and the second polyvinylidene fluoride nanofiber nonwoven fabric has a fiber diameter of 100 to 150 nm, Core type, the sheath-core type, the side-by-side type or the C-type type, and the sheath portion of the sheath- Melting point polyester, and the core portion is a high melting point polyethylene terephthalate.

The filter manufactured according to the present invention has polyvinylidene fluoride nanofiber nonwoven fabric on both sides of the first two-component substrate, the polyethylene terephthalate substrate, and the substrate laminated with the second two-component substrate, so that the pressure loss It is possible to increase the filtration efficiency and extend the life of the filter.

In addition, the electrospinning device includes a flip device for rotating the fabric up and down through 180 DEG, so that it is possible to simplify the process of electrospinning both surfaces of the substrate.

Since the electrospinning device is composed of at least two units, continuous electrospinning is possible, and the mass production of the filter is advantageous.

In addition, polyvinylidene fluoride having a weight average molecular weight of 5,000 is partially melted by heat welding, and serves as an adhesive between the substrate and the nanofiber nonwoven fabric, thereby preventing the nanofiber from being separated from the substrate.

1 is a side view schematically showing an electrospinning apparatus according to the present invention,
2 is a plan view schematically showing a nozzle block installed in each unit of the electrospinning device according to the present invention,
3 is a view schematically showing an auxiliary transfer device of an electrospinning device according to the present invention,
4 is a view schematically showing another embodiment of the auxiliary belt roller of the auxiliary transfer device of the electrospinning apparatus according to the present invention,
FIGS. 5 to 8 are side views schematically showing the operation of the long sheet conveying speed adjusting apparatus of the electrospinning apparatus according to the present invention. FIG.
9 is a schematic view schematically showing a filter including the polyvinylidene fluoride nanofiber and the two-component substrate of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to the scope of the present invention, but is merely an example, and various modifications can be made without departing from the technical spirit of the present invention.

2 is a plan view schematically showing a nozzle block installed in each unit of the electrospinning apparatus according to the present invention, and Fig. 3 is a plan view schematically showing the structure of the electrospinning apparatus according to the present invention, 4 is a view schematically showing another embodiment of the auxiliary belt roller of the auxiliary feeding device of the electrospinning apparatus according to the present invention, and Figs. 5 to 8 are diagrams schematically showing the auxiliary feeding device of the present invention Fig. 9 is a schematic view schematically showing a filter including the polyvinylidene fluoride nanofiber and the two-component base material of the present invention. Fig. 9 is a schematic side view showing the operation of the long sheet feed rate control device of the electrospinning device.

As shown in the figure, an electrospinning device 1 according to the present invention comprises a bottom-up electrospinning device 1, at least one unit 10a or 10b is sequentially arranged at a predetermined interval, Each of the units 10a and 10b produces a filter material such as a nonwoven fabric by electrospinning the same polymer spinning solution separately or by electrospinning a polymer spinning solution having a different material.

For this purpose, each of the units 10a and 10b is provided with a spinning liquid main tank 8 in which a polymer spinning solution is filled and a polymer spinning solution filled in the spinning solution main tank 8 in a predetermined amount A nozzle block 11 for discharging polymer flushing liquid filled in the spinning liquid main tank 8 and having a plurality of nozzles 12 arranged in a pin shape, And a voltage generator 14a, 14b for generating a voltage in the collector 13, the collector 13 being spaced apart from the nozzle 12 by a predetermined distance in order to accumulate the polymer spinning solution injected from the nozzle 13.

The electrospinning device 1 according to the present invention has a structure in which the polymeric spinning liquid filled in the spinning liquid main tank 8 is supplied to a plurality of nozzles 12 formed in the nozzle block 11 through the metering pump, And the supplied polymer spinning solution is radiated and focused on the collector 13 having a high voltage applied thereto through the nozzle 12 to form nanofibers on the long sheet 15 which is moved on the collector 13, The nonwoven fabric is formed, and the formed nanofiber nonwoven fabric is made of a filter or a nonwoven fabric.

In the unit 10a of the units 10a and 10b of the electrospinning device 1 in front of the unit 10a positioned at the tip end of the unit 10a, nanofiber nonwoven fabrics are laminated by spraying the polymer spinning solution A feeding roller 3 for feeding the long sheet 15 is provided and a long sheet 15 in which a nano fiber nonwoven fabric is laminated is provided at the rear of the unit 10b located at the rear end of each unit 10a and 10b Up roller 5 for winding is provided.

On the other hand, it is preferable that the elongated sheet 15 in which the polymer solution is laminated while passing through the units 10a and 10b is made of nonwoven fabric or fabric, but is not limited thereto.

The material of the polymer spinning solution to be radiated through each unit 10a and 10b of the electrospinning device 1 is not limited to a specific material such as polypropylene (PP), polyethylene terephthalate (PET), poly Polyvinylidene fluoride, polyvinylidene fluoride, nylon, polyvinyl acetate, polymethylmethacrylate, polyacrylonitrile (PAN), polyurethane (PUR), polybutylene terephthalate (PBT), polyvinyl butyral, polyvinyl chloride, polyethylene (PEI), polycaprolactone (PCL), polyvinyl alcohol (PVA), polyethylene imide (PEI), polyacrylamide (PLGA), silk, cellulose, and chitosan. Among them, polypropylene (PP) materials and heat resistant polymer materials such as polyamide, polyimide, polyamideimide, poly Aromatic polyesters such as polyethylene terephthalate, polyethylene terephthalate and the like, polytetrafluoroethylene, polydiphenoxaphospazene, polybis [poly (ethylene terephthalate), poly Polyphosphates such as polyphosphazenes such as 2- (2-methoxyethoxy) phosphazene, polyurethane copolymers including polyurethanes and polyetherurethanes, polymers such as cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate and the like Are preferably used in a commercial manner.

The spinning solution supplied through the nozzles 12 in the units 10a and 10b is a solution in which a polymer as a synthetic resin material capable of electrospinning is dissolved in a suitable solvent, But are not limited to, for example, phenol, formic acid, sulfuric acid, m-cresol, thifluoroacetone hydride / dichloromethane, water, N-methylmorpholine N-oxide, chloroform, tetrahydrofuran And aliphatic ketone groups such as methyl isobutyl ketone, methyl ethyl ketone, aliphatic hydroxyl group m-butyl alcohol, isobutyl alcohol, isopropyl alcohol, methyl alcohol, ethanol, aliphatic compounds such as hexane, tetrachlorethylene, acetone, , Diethylene glycol, ethylene glycol, halogen compounds such as trichlorethylene, dichloromethane, aromatic compounds such as toluene, xylene, aliphatic Cyclohexanone and cyclohexane as ester group and n-butyl acetate, ethyl acetate, butyl cellosolve as aliphatic ether group, acetic acid 2-ethoxyethanol, 2-ethoxyethanol, amide dimethylformamide, Dimethylacetamide, and the like, or a mixture of plural kinds of solvents may be used. The spinning solution preferably contains an additive such as a conductivity improver.

On the other hand, the electrospinning device 1 according to the present invention is provided with an overflow device 200. That is, each of the units 10a and 10b of the electrospinning device 1 is provided with a spinning liquid main tank 8, a second transfer pipe 216, a second transfer control device 218, an intermediate tank 220, And an overflow device 200 including a tank 230 are respectively provided.

Although the overflow device 200 is provided in each unit 10a and 10b of the electrospinning device 1 according to the embodiment of the present invention, any one of the units 10a and 10b, And the unit 10b located at the rear end of the overflow device 200 may be integrally connected to the overflow device 200. In this case,

According to the structure as described above, the spinning liquid main tank 8 stores spinning solution to be a raw material of the nanofibers. The spinning liquid main tank 8 is provided therein with an agitating device 211 for preventing separation or coagulation of the spinning solution.

The second transfer pipe 216 is composed of a pipe connected to the spinning liquid main tank 8 or the regeneration tank 230 and valves 212 213 and 214, The spinning liquid is transferred from the tank 230 to the intermediate tank 220.

The second conveyance control device 218 controls the conveyance operation of the second conveyance pipe 216 by controlling the valves 212, 213 and 214 of the second conveyance pipe 216. The valve 212 controls the transfer of the spinning liquid from the spinning liquid main tank 8 to the intermediate tank 220 and the valve 213 is used to transfer the spinning liquid from the regeneration tank 230 to the intermediate tank 220. [ . The valve 214 controls the amount of the polymer spinning solution flowing into the intermediate tank 220 from the spinning liquid main tank 8 and the regeneration tank 230.

The intermediate tank 220 stores the spinning solution supplied from the spinning liquid main tank 8 or the regeneration tank 230 and supplies the spinning solution to the nozzle block 11 and adjusts the liquid surface height of the spinning solution And a second sensor 222 for measuring the temperature.

The second sensor 222 may be a sensor capable of measuring the liquid level height, and is preferably formed of, for example, an optical sensor or an infrared sensor.

A supply pipe 240 and a supply control valve 242 for supplying a spinning solution to the nozzle block 11 are provided in the lower part of the intermediate tank 220. The supply control valve 242 is connected to the supply pipe 240 And the like.

The regeneration tank 230 has an agitating device 231 therein for storing the recovered circulating fluid and preventing separation or coagulation of the circulating fluid, and a first sensor 231 for measuring the liquid level of the recovered circulating fluid, (Not shown).

The first sensor 232 may be a sensor capable of measuring the liquid level height, and is preferably formed of, for example, an optical sensor or an infrared sensor.

On the other hand, the spinning liquid overflowed in the nozzle block 11 is recovered through the spinning liquid recovery path 250 provided below the nozzle block 11. [ The spinning solution recovery path 250 recovers the spinning solution to the regeneration tank 230 through the first transfer pipe 251.

The first transfer pipe 251 is provided with a pipe and a pump connected to the regeneration tank 230 and the spinning liquid is transferred from the spinning liquid recovery path 250 to the regeneration tank 230 by the power of the pump .

At this time, it is preferable that at least one of the regeneration tanks 230 is provided, and when there are two or more, the first sensor 232 and the valve 233 may be provided in plurality.

When the number of the regeneration tanks 230 is two or more, a plurality of valves 233 located above the regeneration tank 230 are also provided, so that a first transfer control device (not shown) It is possible to control the two or more valves 233 located at the upper part in accordance with the height of the liquid level of the first sensor 232 to control whether the spinning liquid is to be transferred to one of the plurality of regeneration tanks 230 do.

Meanwhile, the VOC recycling apparatus 300 is provided in the electrospinning apparatus 1. That is, a condenser (not shown) for condensing and liquefying VOC (Volatile Organic Compounds) generated during spinning of the polymer spinning solution through the nozzles 12 to the units 10a and 10b of the electrospinning device 1, (320) for distilling and liquefying the condensed VOC through the condenser (310) and the condenser (310), and a solvent storage device (330) for storing the liquefied solvent through the distillation device A VOC recycling apparatus 300 is provided.

Here, the condenser 310 is preferably a water-cooled, evaporative or air-cooled condenser, but is not limited thereto.

The vaporized VOC generated in each of the units 10a and 10b is introduced into the condenser 310 and the vaporized VOC generated in the condenser 310 is stored in the solvent storage unit 330 The pipes 311 and 331 are connected to each other.

That is, pipes 311 and 331 for interconnecting the units 10a and 10b and the condenser 310, the condenser 310, and the solvent storage unit 330 are connected to each other.

In an embodiment of the present invention, the VOC is condensed through the condenser 310, and the condensed and liquefied VOC is supplied to the solvent storage device 330. However, the condenser 310 and the solvent storage It is also possible that a distillation apparatus 320 is provided between the apparatuses 330 so as to separate and sort each solvent when more than one solvent is applied.

Here, the distillation apparatus 320 is connected to the condenser 310 to vaporize the VOC in the liquefied state by the high-temperature heat and to cool it again to supply the liquefied VOC to the solvent storage apparatus 330.

In this case, the VOC recycling apparatus 300 includes a condenser 310 for supplying air and cooling water to the vaporized VOC discharged through the units 10a and 10b and condensing and liquefying the same, A distillation apparatus 320 for converting the condensed VOC to heat to form a vaporized state and then cooling it to a liquefied state and a solvent storage apparatus 330 for storing the liquefied VOC through the distillation apparatus 320 .

Here, the distillation apparatus 320 is preferably a fractionation apparatus, but it is not limited thereto.

That is, the piping for interconnecting the units 10a and 10b and the condensing unit 310, the condensing unit 310 and the distillation unit 320, and the distillation unit 320 and the solvent storage unit 330 311, 321, and 331 are connected to each other.

Then, the content of the solvent in the spinning liquid overflowed and recovered in the recovery tank 230 is measured. The measurement can be performed by extracting a part of the spinning solution as a sample in the recovery tank 230 and analyzing the sample. Analysis of the spinning solution can be carried out by a known method.

Based on the measurement results, the required amount of the solvent is supplied to the regeneration tank 230 through the pipe 332 in the liquefied state, which is supplied to the solvent storage device 330. That is, the liquefied VOC is supplied to the regeneration tank 230 by a required amount according to the measurement result, and can be reused and recycled as a solvent.

The case 18 constituting each unit 10a and 10b of the electrospinning device 1 is preferably made of a conductor but the case 18 may be made of an insulator or the case 18 may be made of a conductive material, A body and an insulator may be used in combination, or may be made of various other materials.

It is also possible to eliminate the insulating member 19 when the upper portion of the case 18 is made of an insulator and the lower portion thereof is used in combination as a conductor. To this end, the case 18 is preferably formed as a case 18 by being coupled with a lower part formed of a conductor and an upper part formed of an insulator, but the present invention is not limited thereto.

As described above, the case 18 is formed of a conductor and an insulator, and the upper part of the case 18 is formed of an insulator so that the collector 18 is separately provided for mounting the collector 13 on the inner surface of the upper part of the case 18 It is possible to eliminate the insulating member 19, which can simplify the structure of the apparatus.

It is also possible to optimize the insulation between the collector 13 and the case 18 so that when 35 kV is applied between the nozzle block 11 and the collector 13 for electrospinning, It is possible to prevent the breakdown of the insulation that may occur between the electrode 18 and other members.

In addition, the leakage current can be stopped within a predetermined range, the current supplied from the voltage generators 14a and 14b can be monitored, and the abnormality of the electrospinning device 1 can be detected early, (1) can be continuously operated for a long time, and the production of nanofibers having required performance is stable and mass production of nanofibers is possible.

Here, the thickness a of the case 18 formed of an insulator is made to satisfy "a = 8 mm".

Therefore, when 40 kV is applied between the nozzle block 11 and the collector 13 to perform electrospinning, an insulation breakdown that may occur between the collector 13 and the case 18 and other members And the leakage current can be limited within a predetermined range.

The distance between the inner surface of the case 18 formed of an insulator and the outer surface of the collector 13 is smaller than the thickness a of the case 18 and the distance between the inner surface of the case 18 and the outer surface of the collector 13 The distance "b" is made to satisfy "a + b = 80 mm".

Therefore, when 40 kV is applied between the nozzle block 11 and the collector 13 to perform electrospinning, an insulation breakdown that may occur between the collector 13 and the case 18 and other members And the leakage current can be limited within a predetermined range.

On the other hand, the temperature control device 60 is provided in each tube 40 of the nozzle block 11 provided in each unit 10a, 10b of the electrospinning device 1 according to the present invention, ).

2, the tubular body 40 of the nozzle block 11, which is provided in each of the units 10a and 10b and to which the polymer spinning solution is supplied by the plurality of nozzles 12 provided on the respective units 10a and 10b, ) Is provided with a temperature control device (60).

Here, the flow of the polymer spinning solution in the nozzle block 11 is supplied to each tube 40 from the spinning liquid main tank 8 in which the polymer spinning solution is stored, through the solution flow pipe.

The polymer spinning solution supplied to each tube 40 is discharged and injected through a plurality of nozzles 12 and accumulated on the long sheet 15 in the form of nanofibers.

A plurality of nozzles 12 are mounted at predetermined intervals in the longitudinal direction on each of the tubes 40. The nozzles 12 and the tubes 40 are electrically connected to the tube 40 .

3, an auxiliary conveying device (not shown) for regulating the conveying speed of the elongate sheet 15 which is drawn into and supplied into each unit 10a, 10b of the electrospinning device 1 according to the present invention 16 are provided.

The auxiliary conveying device 16 is provided for controlling the conveying speed of the long sheet 15 so as to facilitate detachment and conveyance of the long sheet 15 attached by the electrostatic attraction to the collector 13 provided in each unit 10a, An auxiliary belt 16a rotating synchronously and an auxiliary belt roller 16b supporting and rotating the auxiliary belt 16a.

The auxiliary belt 16a is rotated by the rotation of the auxiliary belt roller 16b by the above structure and the long sheet 15 is rotated by the rotation of the auxiliary belt 16a to the units 10a and 10b And one auxiliary belt roller 16b of the auxiliary belt roller 16b is rotatably connected to the motor for this purpose.

In the embodiment of the present invention, five auxiliary belt rollers 16b are provided on the auxiliary belt 16a, and one of the auxiliary belt rollers 16b is rotated by the operation of the motor to rotate the auxiliary belt 16a At the same time, the remaining auxiliary belt rollers 16b are rotated. However, the auxiliary belt 16a is provided with two or more auxiliary belt rollers 16b, and one of the auxiliary belt rollers 16b is rotated by the operation of the motor , So that the auxiliary belt 16a and the remaining auxiliary belt roller 16b are rotated.

In the embodiment of the present invention, the auxiliary transfer device 16 is composed of an auxiliary belt roller 16b and an auxiliary belt 16a that can be driven by a motor. However, as shown in FIG. 4, The roller 16b may be made of a roller having a low coefficient of friction.

At this time, the auxiliary belt roller 16b preferably comprises a roller including a bearing having a low friction coefficient.

The auxiliary conveying device 16 is composed of the auxiliary belt 16a and the auxiliary belt roller 16b having a low coefficient of friction but only the roller having a low friction coefficient excluding the auxiliary belt 16a So that the long sheet 15 is transported.

In addition, in the embodiment of the present invention, the auxiliary belt roller 16b is applied with a roller having a low coefficient of friction. However, if the roller has a low coefficient of friction, it is not limited to the shape and configuration of the roller, It is also possible to apply rollers including bearings such as roller bearings, sliding bearings, sleeve bearings, fluid pressure journal bearings, hydrostatic journal bearings, pneumatic bearings, air bearing bearings, air static bearings and air bearings, It is also possible to apply a roller having a reduced coefficient of friction by including a material and an additive.

On the other hand, the thickness measuring device 70 is provided in the electrospinning device 1 according to the present invention. That is, as shown in Fig. 1, a thickness measuring device 70 is provided between each unit 10a, 10b of the electrospinning device 1, and the thickness measured by the thickness measuring device 70 And controls the feed velocity V and the nozzle block 11. [

When the thickness of the nanofiber nonwoven fabric discharged from the unit 10a located at the front end of the electrospinning device 1 is measured to be thinner than the amount of deviation by the above-described structure, the conveyance speed V of the next unit 10b, The discharge amount of the nozzle block 11 is increased and the voltage intensity of the voltage generating devices 14a and 14b is adjusted to increase the discharge amount of the nanofiber nonwoven fabric per unit area to increase the thickness.

When the thickness of the nanofiber nonwoven fabric discharged from the unit 10a located at the front end of the electrospinning device 1 is measured to be thicker than the amount of deviation, the feeding speed V of the next unit 10b is increased, It is possible to reduce the thickness by reducing the discharge amount of the block 11 and adjusting the intensity of the voltage of the voltage generating devices 14a and 14b to reduce the discharge amount of the nanofiber nonwoven fabric per unit area to reduce the amount of lamination, A nanofiber nonwoven fabric having a uniform thickness can be produced.

Here, the thickness measuring device 70 is disposed so as to face upward and downward with a long sheet 15 interposed therebetween, and measures the distance to the upper or lower portion of the long sheet 15 by an ultrasonic measuring method, And a thickness measuring unit including a pair of ultrasonic longitudinal wave measuring systems for measuring the ultrasonic longitudinal wave.

Thus, the thickness of the long sheet 15 can be calculated on the basis of the distance measured by the pair of ultrasonic measuring devices. That is, the ultrasonic longitudinal wave and the transverse wave are projected to the long sheet 15 laminated with the nanofiber nonwoven fabric so that the propagation time of the longitudinal wave and the transverse wave, that is, the time during which the ultrasonic signals of the longitudinal wave and the transverse wave reciprocate on the longitudinal sheet 15 A predetermined calculation using the propagation time of longitudinal waves and transverse waves and the propagation speed of longitudinal waves and transverse waves at the reference temperature of the elongated sheet 15 in which the nanofiber nonwoven fabric is laminated and the temperature constants of longitudinal waves and transverse wave propagation velocities Is a thickness measuring apparatus (70) using an ultrasonic longitudinal wave and a transverse wave to calculate the thickness of the subject from the equation.

In other words, the thickness measuring device 70 measures the propagation time of the longitudinal wave and the transverse wave, and the propagation time of the longitudinal wave and the transverse wave at the reference temperature of the elongate sheet 15, The thickness of the elongate sheet 15 in which the nanofiber nonwoven fabric is laminated is calculated from a predetermined equation using a propagation velocity and a temperature constant of the longitudinal wave and the transverse wave propagation velocity to determine the propagation velocity It is possible to precisely measure the thickness by self-compensating for the error due to the change, and it is possible to measure the thickness accurately even if there is any type of temperature distribution in the nanofiber nonwoven fabric.

The thickness of the nanofiber nonwoven fabric of the long sheet 15 to be transported after the polymer spinning solution is injected and laminated to the electrospinning device 1 according to the present invention is measured to determine the conveying speed of the long sheet 15 and the conveying speed of the nozzle block 11 The elongated sheet conveying speed regulating device 30 for regulating the conveying speed of the long sheet 15 is further provided on the electrospinning device 1. The thickness measuring device 70 controls the conveying speed of the long sheet 15,

The elongated sheet conveying speed regulator 30 includes a buffer zone 31 formed between each unit 10a and 10b of the electrospinning device 1 and a buffer zone 31 provided on the buffer zone 31, A pair of support rollers 33 and 33 'for supporting the support rollers 15 and an adjustment roller 35 provided between the pair of support rollers 33 and 33'.

At this time, the support rollers 33 and 33 'are provided so that when the long sheet 15, in which the nanofiber nonwoven fabric is laminated by the spinning solution injected by the nozzles 12 in the respective units 10a and 10b, For supporting the conveyance of the sheet 15 and provided at the line and the rear end of the buffer zone 31 formed between the units 10a and 10b.

The adjustment roller 35 is provided between the pair of support rollers 33 and 33 'so that the long sheet 15 is wound and moved up and down by the adjustment roller 35, The feeding speed and the moving time of the long sheets 15a and 15b for each unit 10a and 10b are adjusted.

To this end, a sensing sensor (not shown) for sensing the feeding speed of the long sheets 15a, 15b in each of the units 10a, 10b is provided. In each unit 10a, 10b sensed by the sensing sensor, And a main controller 7 for controlling the movement of the adjusting roller 35 in accordance with the feeding speed of the long sheets 15a and 15b.

In one embodiment of the present invention, the conveying speed of the long sheets 15a and 15b is sensed in each of the units 10a and 10b and the control unit controls the conveying speed of the adjusting rollers 15a and 15b according to the conveying speed of the long sheets 15a and 15b. The auxiliary belt 16a provided on the outer side of the collector 13 or the auxiliary belt 16a for driving the auxiliary belt 16a for transferring the long sheets 15a and 15b, The control unit may detect the driving speed of the roller 16b or the motor (not shown), and thereby control the movement of the adjusting roller 35. [

With the above structure, the detection sensor can detect the length of the long sheet (15a) in the unit (10b) in which the conveying speed of the long sheet (15a) in the unit (10a) 15b, it is possible to prevent the elongated sheet 15a, which is conveyed in the unit 10a located at the leading end, from sagging, as shown in Figs. 5 to 6, The unit 10b positioned at the rear end in the unit 10a positioned at the front end while the regulating roller 35 wound around the long sheet 15 is moved downward and provided between the supporting rollers 33 and 33 ' The elongated sheet 15a which is conveyed to the outside of the unit 10a located at the front end among the elongated sheets 15 to be conveyed to the buffering section 31 is conveyed to the buffer section 31 located between the units 10a and 10b, The conveying speed of the long sheet 15a in the unit 10a positioned at the rear end And the positioning unit (10b) so that the same correction of the feed rate in a long sheet (15b) to control and prevent sagging and wrinkling of the elongated sheet (15a).

On the other hand, if the conveyance speed of the long sheet 15a in the unit 10a located at the front end of each unit 10a, 10b is smaller than the conveyance speed of the long sheet 15b in the unit 10b positioned at the rear end, 7 to 8, in order to prevent the long sheet 15b conveyed in the unit 10b located at the rear end from tearing, the pair of support rollers 33 And 33 ', and is conveyed to the unit 10b located at the rear end thereof in the unit 10a positioned at the leading end while moving the regulating roller 35 wound around the long sheet 15 upward The elongated sheet 15a wound on the regulating roller 35 is guided to the buffer zone 31 located between the units 10a and 10b by being transported to the outside of the unit 10a positioned at the tip of the elongated sheet 15, To the unit 10b positioned at the rear end, and supplies it to the unit 10b positioned at the front end, The feed rate of the root (15a) unit (10b) within the elongated sheet (15b) which is located in the transfer speed and the rear end of the year, while the correction control such that the same prevents the dead of the elongated sheet (15b).

By adjusting the feeding speed of the long sheet 15b to be fed into the unit 10b located at the rear end of each of the units 10a and 10b by the above described structure, It is possible to obtain the effect that the conveying speed of the long sheet 15b in the unit 10b for making the unit 10b becomes equal to the conveying speed of the long sheet 15a in the unit 10a located at the leading end thereof.

Meanwhile, a flip device 110 is provided in the middle of the electrospinning device 1 according to the present invention. That is, a flip device 110 for rotating the elongated sheet 15 is provided between the unit 10a positioned at the front end of the electrospinning device 1 and the unit 10b positioned at the rear end.

The flip device 110 is formed in a cylindrical shape and has guiding grooves 112 and 112 'for guiding the both ends of the long sheet 15 inserted and guided in the horizontal direction at both sides in the center of the flip device 110, Are formed so as to protrude inwardly.

At this time, any of the guide pieces 111 protruding from the inner circumference of the flip device 110 is formed to extend upward along the inner circumference, and the other guide piece 111 ' Is formed to extend in a downward direction along the inner periphery of the guide member 111 and 111 '', and the guide members 111 and 111 'are extended in a spiral shape along the inner circumference of the flip device, And 112 'are guided by the guide grooves 112 and 112' of the guide pieces 111 and 111 ', and rotate by 180 °.

Is supplied to the unit 10a located at the tip of each of the units 10a and 10b by the auxiliary transfer device 16 composed of the auxiliary belt 16a and the auxiliary belt roller 16b by the above- The polymeric solution is radiated to the lower surface of the elongated sheet 15, and the elongated sheet 15 is passed through the flip device 110 and rotated 180 degrees so that the lower surface thereof is positioned on the upper side and the upper surface is positioned on the lower side, The unit 10a including the nozzle block 11 and the nozzle 12 for electrospinning such that the sheet 15 is fed to the unit 10b located at the rear end and then the polymer solution is radiated to the lower face thereof, The polymeric spinning solution can be electrospun on the lower surface and the upper surface of the elongate sheet 15 without changing the upper and lower positions of the long sheets 15a and 10b.

A drying device (not shown) such as a hot air fan or an electric heater is provided on the flip device 110 to dry the long sheet 15 when the long sheet 15 is rotated through the flip device 110 desirable.

On the other hand, the electrospinning device 1 according to the present invention is provided with the air permeability measuring device 80. That is, the air permeability measurement for measuring the air permeability of the nanofiber nonwoven fabric manufactured through the electrospinning device 1 at the rear of the unit 10b positioned at the rear end of each unit 10a, 10b of the electrospinning device 1 Device 80 is provided.

As described above, the feeding speed of the long sheet 15 and the nozzle block 11 are controlled on the basis of the air permeability of the nanofiber nonwoven fabric measured through the air permeability measuring device 80.

When the air permeability of the nanofiber nonwoven fabric discharged through the units 10a and 10b of the electrospinning device 1 is measured largely, the feeding speed V of each unit 10a and 10b is delayed, The amount of discharge of the nanofibers per unit area is increased by regulating the intensity of the voltage of the voltage generators 14a and 14b so that the air permeability is reduced.

When the air permeability of the nanofiber nonwoven fabric discharged through each unit 10a and 10b of the electrospinning device 1 is measured to be small, the feeding speed V of each of the units 10a and 10b is increased, The amount of discharge of the block 11 is reduced and the intensity of the voltage of the voltage generating devices 14a and 14b is adjusted to reduce the discharge amount of the nanofibers per unit area to reduce the amount of lamination,

As described above, it is possible to manufacture a nanofiber nonwoven fabric having a uniform air permeability by controlling the feeding speed of each unit 10a, 10b and the nozzle block 11 according to the degree of air permeability after measuring the air permeability of the nonwoven fabric .

Here, if the air entrainment amount P of the nonwoven fabric is less than a predetermined value, the feed speed V is not changed from the initial value. If the deviation amount P is equal to or larger than the predetermined value, It is possible to simplify the control of the conveyance speed V by the conveyance speed (V) control device.

It is also possible to control the discharge amount and the voltage of the nozzle block 11 in addition to the control of the feed speed V so that when the air flow deviation amount P is less than a predetermined value, When the amount of deviation P is equal to or larger than the predetermined value, the discharge amount of the nozzle block 11 and the voltage intensity are controlled to be changed from the initial value so that the discharge amount of the nozzle block 11 and the voltage It is possible to simplify the control of the intensity of the light.

The main control device 7 includes a nozzle block 11, voltage generators 14a and 14b, a thickness measuring device 70, The elongated sheet conveying speed regulating device 30 and the air permeability measuring device 80 are controlled.

A laminating apparatus 90 for laminating the nanofiber nonwoven fabric electrospun through the units 10a and 10b of the electrospinning apparatus 1 is disposed at a rear end of each unit 10a and 10b 10b and performs a post-process of the nanofiber nonwoven fabric electrospun through the electrospinning device 1 by the laminating device 90. [

Hereinafter, a method of manufacturing a filter including the polyvinylidene fluoride nanofiber using the electrospinning device according to the present invention will be described.

In the present invention, a polyvinylidene fluoride solution obtained by mixing polyvinylidene fluoride having a weight average molecular weight of 50,000 and polyvinylidene fluoride having a weight average molecular weight of 5,000 as a solvent is used as the polymer solution, A substrate is used in which the first two-component substrate is attached to one side of the polyethylene terephthalate substrate and the second two-component substrate is attached to the other side of the polyethylene terephthalate substrate. That is, the first two-component substrate, the polyethylene terephthalate substrate, and the second two-component substrate are laminated in this order.

On the other hand, the fiber forming polymers of the first and second binary materials may be a polyester including polyethylene terephthalate, polyethylene naphthalate, polypropylene terephthalate, and polybutylene terephthalate, and polypropylene terephthalate And polybutylene terephthalate such as polytrimethylene terephthalate and polytetramethylene terephthalate.

The first and second two-component substrates in the present invention are most preferably polyethylene terephthalate in which two components having different melting points are combined. The polyethylene terephthalate two-component substrate may be classified into a sheath-core type, a side-by-side type, a C-type, and the like. In the case of the sheath-core type two-component substrate, the sheath portion is a low melting point polyethylene terephthalate, and the core portion is made of general polyethylene terephthalate. Wherein the sheath portion is about 10 to 90 wt%, and the core is about 90 to 10 wt%. The sheath portion acts as a thermal binder to form the outer surface of the binder fiber, has a melting point of about 80 to 150 占 폚, and the core has a melting point of about 160 to 250 占 폚. The CIS type heterogeneous base material used as an embodiment in the present invention includes an amorphous polyester copolymer in which a melting point is not exhibited by a conventional melting point analyzer in the sheath portion and preferably a relatively high melting point component Is a thermally adhesive composite fiber to be used.

The polyester copolymer contained in the sheath portion is a copolyester in which 50 to 70 mol% is a polyethylene terephthalate unit. As the copolymerizable acid component, isophthalic acid is preferably used in an amount of 30 to 50 mol%, but any other conventional dicarboxylic acid may be used.

As a high melting point component used as a core component, a polymer having a melting point of 160 ° C or higher is suitable. Examples of the high melting point component include polyethylene terephthalate, polybutylene terephthalate, polyamide, polyethylene terephthalate copolymer and polypropylene.

In order to produce the filter of the present invention, first, a polyvinylidene fluoride solution having a weight average molecular weight of 50,000 and a polyvinylidene fluoride solution having a weight average molecular weight of 5,000 dissolved in an organic solvent, The polyvinylidene fluoride solution supplied to the spinning liquid main tank 8 connected to the units 10a and 10b and supplied to the spinning liquid main tank 8 is supplied with a high voltage through a metering pump Is supplied continuously and quantitatively into the plurality of nozzles 12 of the nozzle block 11. The polyvinylidene fluoride solution supplied from each of the nozzles 12 is supplied to the collector 12 of the first binary component, the polyethylene terephthalate base, and the second binary component, which are located on the collector 13, And the units are stacked in a stacked manner in the order of the substrate 10a, 10b, and the polyvinylidene fluoride nanofiber nonwoven fabric is laminated in each of the units 10a, 10b.

On the other hand, in the first unit 10a located at the front end of the electrospinning device 1, the polyvinylidene fluoride solution is electrospun to form a first polyvinylidene fluoride nanofiber nonwoven fabric, 2 unit 10b, the polyvinylidene fluoride solution is electrospun to form a second polyvinylidene fluoride nanofiber nonwoven fabric.

The flip device 110 provided between the first unit 10a and the second unit 10b of the electrospinning device 1 is used to move up and down the fabric passing through the first unit 10a 180 °. That is, after passing through the first unit 10a, the first polyvinylidene fluoride nanofiber nonwoven fabric. A fabric laminated in the order of a first two-component substrate, a polyethylene terephthalate substrate, and a second two-component substrate is supplied to the flip device 110, wherein the upper surface of the fabric is positioned at the lower surface And the upper and lower sides of the fabric are rotated 180 DEG so that the lower surface of the fabric is changed to the upper surface. In other words, the top and bottom of the fabric are rotated by 180 ° such that the other side of the second binary component not bonded to the polyethylene terephthalate substrate faces the nozzle block 11 of the electrospinning device 1. Thereafter, the polyvinylidene fluoride solution supplied from the spinning liquid main tank 8 connected to the second unit 10b is electrospun on the second bimaterial substrate to form a second polyvinylidene fluoride nanofiber nonwoven fabric .

The substrate laminated in this order of the first two-component substrate, the polyethylene terephthalate substrate, and the second two-component substrate includes a feed roller 3 operated by driving of a motor (not shown) Is transferred from the first unit 10a to the second unit 10b through the flip device 110 by the rotation of the auxiliary transfer device 16 driven by the first transfer device 16, , A polyethylene terephthalate base material and a second two-component base material laminated in this order on both sides of the base material, the first and second polyvinylidene fluoride nanofiber nonwoven fabrics are laminated by a continuous electrospinning process.

In addition, in the process of electroluminescence of the polyvinylidene fluoride solution on the substrate laminated in the order of the first, second, and ternary binary materials, the first and second binary materials, The polyvinylidene fluoride nanofiber nonwoven fabric having a large fiber diameter is laminated in the first unit 10a by varying the spinning conditions for the first unit 10a and the second unit 10b while the second unit 10b is made of polyvinylidene fluoride It is also possible to continuously laminate the nonwoven fabrics of ridged nano fibers.

This is because the first polyvinylidene fluoride nanofiber nonwoven fabric having a fiber diameter of 150 to 300 nm is applied to the first bicomponent base material 10 by applying a low radiation voltage to the voltage generating device 14a for supplying a voltage to the first unit 10a, , A polyethylene terephthalate base material, and a second two-component base material laminated in this order on the first two-component substrate, and passing through the flip device to form the first polyvinylidene fluoride nanofiber nonwoven fabric, Min, a polyethylene terephthalate base material, and a second two-component base material are stacked in this order. A second polyvinylidene fluoride nanofiber nonwoven fabric having a fiber diameter of 100 to 150 nm is applied to a voltage generating device 14b for supplying a voltage to the second unit 10b with a high radiation voltage to the second ion- And laminated on the substrate. The radiation voltage applied to each of the voltage generators 14a and 14b is 1 kV or more and preferably 15 kV or more and a voltage applied by the voltage generator 14a of the first unit 10a is applied to the second unit 10b. Is lower than the voltage applied by the voltage generator (14b).

In the present invention, the first polyvinylidene fluoride nanofiber nonwoven fabric having a fiber diameter of 150 to 300 nm is applied at a low voltage to the first unit 10a of the electrospinning device 1 as a first binary material substrate, The second unit 10b is laminated on the first two-component substrate of the substrate laminated in this order of the phthalate substrate and the second two-component substrate. The voltage of the second unit 10b is increased to give a second polyvinylidene It is possible to fabricate a filter with a laminate structure on a second two-component substrate of a laminated fluoride nanofiber nonwoven fabric in the order of the first two-component substrate, the polyethylene terephthalate substrate, and the second two-component substrate. However, the second polyvinylidene fluoride nanofiber nonwoven fabric having a fiber diameter of 100 to 150 nm is diffused and laminated in the first unit 10a by varying the strength of the voltage, and the first polyvinylidene fluoride nanofibers having a fiber diameter of 150 to 300 nm It is also possible that the lidene fluoride nanofiber nonwoven fabric is emitted from the second unit 10b.

 The number of units of the electrospinning device 1 may be three or more, and three or more polyvinylidene fluoride nanofiber nonwoven fabrics having different fiber diameters may be disposed on the first two-component substrate, A polyethylene terephthalate base material and a second two-component base material laminated on both surfaces of a laminated substrate in this order.

 In an embodiment of the present invention, a method of varying the intensity of voltage applied to each unit 10a, 10b to give a fiber diameter gradient of the polyvinylidene fluoride nanofiber nonwoven fabric is used, The nanofiber nonwoven fabric having a fiber diameter gradient can be formed by adjusting the distance between the fibers 13. In this case, when the type of spinning solution and the supplied voltage intensity are the same, the fiber diameter becomes larger as the spinning distance becomes closer, and the nanofiber nonwoven fabric imparted with the fiber diameter gradient becomes smaller as the spinning distance becomes longer . It is also possible to adjust the concentration and viscosity of the spinning solution or adjust the moving speed of the long sheet to set a gradient of the fiber diameter.

On the first two-component substrate of the substrate laminated in this order from the first unit 10a of the electrospinning apparatus 1 in the above-described manner in the order of the first two-component substrate, the polyethylene terephthalate substrate, and the second two- A first polyvinylidene fluoride nanofiber nonwoven fabric is laminated and a first polyvinylidene fluoride nanofiber is laminated with a substrate laminated in this order of the first two-component substrate, the polyethylene terephthalate substrate, and the second two- A second polyvinylidene fluoride nanofiber nonwoven fabric is laminated on the second two-component substrate in the second unit 10b after the fabric consisting of the nonwoven fabric passes through the flip device 110 and the fabric is rotated up and down by 180 degrees. . After the first and second polyvinylidene fluoride nanofibers are laminated on both sides of the substrate laminated in this order of the first two-component substrate, the polyethylene terephthalate substrate, and the second two-component substrate, the electrospinning device 1, And the laminating apparatus 90 located at the rear end of the laminating apparatus 90 is thermally fused to produce the filter of the present invention.

Example 1

Melting point polyvinylidene fluoride having a weight average molecular weight (Mw) of 50,000 and low melting point polyvinylidene fluoride having a weight average molecular weight of 5,000 are dissolved in dimethylacetamide to prepare a spinning liquid, and the first and second Two units of spinning liquid were introduced into the main tank. The first unit of the electrospinning device having basis weight of 30g / m ² in the first two-component base material, a basis weight of 130g / m ² of a polyethylene terephthalate base material, the basis weight is laminated in the order of 30g / m ² in a second two-component base And the spinning solution was electrospun on the first two-component substrate of the fabric to form a first polyvinylidene fluoride nanofiber nonwoven fabric having a thickness of 2.5 탆. In the flip device located at the rear end of the first unit, in the fabric in which the second binary component, the polyethylene terephthalate base, the first binary component, and the first polyvinylidene fluoride nanofiber nonwoven fabric are laminated in this order, The upper and lower sides of the fabric are inverted by 180 DEG so that one surface of the second unidirectional base material faces the nozzle block. Subsequently, in the second unit, the spinning solution was continuously electrospun on one surface of the second two-component substrate facing the nozzle block to form a second polyvinylidene fluoride nanofiber nonwoven fabric having a thickness of 2.5 탆. After the electrospinning, the fabric laminated in the order of the first polyvinylidene fluoride nanofiber nonwoven fabric, the first two-component base, the polyethylene terephthalate base, the second two-component base, and the second polyvinylidene fluoride nanofiber nonwoven fabric was laminated to the laminating apparatus And finally the filter was manufactured. At this time, the electrospinning was carried out under the conditions of a distance between the electrode and the collector of 40 cm, an applied voltage of 20 kV, a spinning liquid flow rate of 0.1 mL / h, a temperature of 22 ° C and a humidity of 20%.

Example 2

Melting point polyvinylidene fluoride having a weight average molecular weight (Mw) of 50,000 and low melting point polyvinylidene fluoride having a weight average molecular weight of 5,000 are dissolved in dimethylacetamide to prepare a spinning liquid, and the first and second Two units of spinning liquid were introduced into the main tank. The first unit of the electrospinning device having basis weight of 30g / m ² in the first two-component base material, a basis weight of 130g / m ² of a polyethylene terephthalate base material, the basis weight is laminated in the order of 30g / m ² in a second two-component base A first polyvinylidene fluoride nanofiber nonwoven fabric having a thickness of 2.5 mu m and a fiber diameter of 250 nm was laminated by applying an applied voltage of 15 kV on the first two-component substrate of the fabric and electrospunning the spinning solution. In the flip device located at the rear end of the first unit, in the fabric in which the second binary component, the polyethylene terephthalate base, the first binary component, and the first polyvinylidene fluoride nanofiber nonwoven fabric are laminated in this order, The upper and lower sides of the fabric are inverted by 180 DEG so that one surface of the second unidirectional base material faces the nozzle block. Subsequently, in the second unit, an applied voltage of 20 kV was applied to one surface of the second two-component substrate facing the nozzle block, and the spinning solution was continuously electrospun to form second polyvinylidene fluoride nanofibers having a thickness of 2.5 탆 and a fiber diameter of 130 nm Nonwoven fabrics were laminated. After the electrospinning, the fabric laminated in the order of the first polyvinylidene fluoride nanofiber nonwoven fabric, the first two-component base, the polyethylene terephthalate base, the second two-component base, and the second polyvinylidene fluoride nanofiber nonwoven fabric was laminated to the laminating apparatus And finally the filter was manufactured. At this time, the electrospinning was carried out under the conditions of a distance between the electrode and the collector of 40 cm, a circulating fluid flow rate of 0.1 mL / h, a temperature of 22 ° C, and a humidity of 20%.

Comparative Example 1

The polyethylene terephthalate base material used in Example 1 was used as a filter media.

Comparative Example 2

A filter was prepared by electrospinning polyvinylidene fluoride on both sides of a polyethylene terephthalate substrate.

- Filtration efficiency measurement

The DOP test method was used to measure the efficiency of the fabricated nanofiber filter. The DOP test method measures the dioctyl phthalate (DOP) efficiency with an automated filter analyzer (AFT) of TSI 3160 from TSI Incorporated and measures the permeability, filter efficiency and differential pressure of the filter media material .

The automation analyzer is a device that automatically measures the velocity of air, DOP filtration efficiency, air permeability (permeability), etc. by passing DOP through the filter sheet by making particles of desired size and is a very important device for high efficiency filter.

The DOP% efficiency is defined as:

DOP% efficiency = (1 - (DOP concentration downstream / DOP concentration upstream)) 100

The filtration efficiencies of Examples 1 and 2 and Comparative Example 1 were measured by the above-mentioned methods and are shown in Table 1.

Example 1 Example 2 Comparative Example 1 0.35 탆 DOP
Filtration efficiency (%) 90 93 70

- pressure drop and filter life measurement

The pressure drop of the fabricated nanofiber nonwoven filter was measured with ASHRAE 52.1 according to the flow rate of 50 / / m ³ , and the filter lifetime was measured. Data comparing Examples 1 and 2 and Comparative Example 1 are shown in Table 2.

Example 1 Example 2 Comparative Example 1 Pressure drop (in.w.g) 4.5 4.6 8.9 Filter life (month) 5.8 5.8 3.0

According to Table 2, it can be seen that the filter manufactured through the embodiment of the present invention has a lower pressure drop due to a lower pressure drop than the comparative example, and the filter has a longer life span, resulting in superior durability.

- whether or not the nano fiber nonwoven fabric is removed

As a result of measuring whether or not the fabricated nanofiber nonwoven fabric and the filter substrate were desorbed by the ASTM D 2724 method, the nanofiber nonwoven fabric was not desorbed in the filters manufactured in Examples 1 and 2, The filter had a tendency to desorb the nanofiber nonwoven fabric.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. Anyone with it will know easily.

1: electrospinning device, 3: feed roller,
5: take-up roller, 7: main control device,
8: spinning liquid main tank, 10a, 10b: unit,
11: nozzle block, 12: nozzle,
13: collector, 14, 14a, 14b: voltage generator,
15, 15a, 15b: long sheet, 16: auxiliary conveying device,
16a: auxiliary belt, 16b: auxiliary belt roller,
18: case, 19: insulating member,
30: Long sheet conveying speed adjusting device, 31: Buffer section,
33, 33 ': support roller, 35: regulating roller,
40: tube, 60: temperature control device,
70: thickness measuring device, 80: air permeability measuring device,
90: laminating device, 110: flip device,
111, 111 ': guide piece, 112, 112': guide groove,
200: overflow device, 211, 231: stirring device,
212, 213, 214, 233: valve, 216: second transfer pipe,
218: second conveyance control device, 220: intermediate tank,
222: second sensor, 230: regeneration tank,
232: first sensor, 240: supply pipe,
242: supply control valve, 250: circulating fluid recovery path,
251: first transfer pipe, 300: VOC recycling apparatus,
310: condenser, 311, 321, 331, 332: piping,
320: distillation device, 330: solvent storage device.

Claims (8)

A polyethylene terephthalate substrate;
A first bi-component substrate laminated on one side of the polyethylene terephthalate substrate;
A solution prepared by mixing polyvinylidene fluoride having a weight average molecular weight of 50,000 and polyvinylidene fluoride having a weight average molecular weight of 5,000 on the first two-component substrate was electrospun to obtain a first polyvinylidene fluoride nanofiber Non-woven;
A second biaxial substrate laminated on the other side of the polyethylene terephthalate substrate that is not bonded to the first biaxial substrate;
A solution prepared by mixing polyvinylidene fluoride having a weight average molecular weight of 50,000 and polyvinylidene fluoride having a weight average molecular weight of 5,000 on the second two-component substrate was electrospun and a second polyvinylidene fluoride nanofiber Wherein the polyethylene terephthalate base material, the first and second binary material base materials, and the first and second polyvinylidene fluoride nanofiber nonwoven fabrics are thermally fused,
Wherein the first and second binary substrates are any one selected from a sheath-core type, a side by side type, and a C-type type. The poly (vinylidene fluoride) A filter comprising nanofibers and binary components.
The method according to claim 1,
Wherein the first polyvinylidene fluoride nanofiber nonwoven fabric has a fiber diameter of 150 to 300 nm and the second polyvinylidene fluoride nanofiber nonwoven fabric has a fiber diameter of 100 to 150 nm. And a bicomponent substrate.
delete The method according to claim 1,
Wherein the sheath portion of the sheath-core type two-component base is a low-melting-point polyester having a melting point of 80 to 150 ° C and the core portion is a high-melting-point polyethylene terephthalate having a melting point of 160 ° C or higher . A filter comprising rid nanofibers and a bicomponent substrate.
A flotation device for rotating a fabric between units is provided independently of a spinning liquid main tank connected to a nozzle of a nozzle block located in the unit, A method of manufacturing a filter by an electrospinning device for electrospinning a polymer spinning solution,
Injecting a spinning solution having polyvinylidene fluoride having a weight average molecular weight of 50,000 and polyvinylidene fluoride having a weight average molecular weight of 5,000 dissolved in a solvent into a feeding device of each unit;
Wherein the polyvinylidene fluoride solution is applied onto the first two-component substrate of the substrate laminated in the order of the first two-component substrate, the polyethylene terephthalate substrate, and the second two-component substrate in the first unit of the electrospinning apparatus by electrospinning Thereby forming a first polyvinylidene fluoride nanofiber nonwoven fabric laminate;
Wherein the first polyvinylidene fluoride nanofiber nonwoven fabric, the first binary component, the polyethylene terephthalate based, and the second binary component are stacked in the order of the first polyvinylidene fluoride nanofiber nonwoven fabric, Rotating 180 degrees;
Forming a second polyvinylidene fluoride nanofiber nonwoven fabric layer by electrospinning the spinning solution on the second bi-component substrate not bonded to the polyethylene terephthalate substrate in the second unit of the electrospinning device; And
Thermally fusing a fabric laminated in this order to the first polyvinylidene fluoride nanofiber nonwoven fabric, the first two-component substrate, the polyethylene terephthalate substrate, the second two-component substrate, and the second polyvinylidene fluoride nanofiber nonwoven fabric in this order ;
, Wherein the two-component substrate is any one selected from a sheath-core type, a side-by-side type, and a C-type. A method of manufacturing a filter comprising a rid nanofiber and a two-component substrate.
6. The method of claim 5,
Wherein the first polyvinylidene fluoride nanofiber nonwoven fabric has a fiber diameter of 150 to 300 nm and the second polyvinylidene fluoride nanofiber nonwoven fabric has a fiber diameter of 100 to 150 nm. And a two-component base material.
delete 6. The method of claim 5,
Wherein the sheath portion of the sheath-core type two-component base is a low-melting-point polyester having a melting point of 80 to 150 ° C and the core portion is a high-melting-point polyethylene terephthalate having a melting point of 160 ° C or higher. A method of manufacturing a filter comprising a rid nanofiber and a two-component substrate.

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