KR101543405B1 - Filter including nylon nanofiber and polyvinylidene fluoride nanofiber gradient and its manufacturing method - Google Patents

Abstract

The present invention relates to a filter including nylon nanofibers and polyvinylidene fluoride nanofibers, and a method of manufacturing the same, and more particularly, to a filter comprising a nylon nanofiber nonwoven fabric and a polyvinylidene fluoride nanofiber nonwoven fabric laminated on both surfaces of a substrate And a method for producing the same.
The manufacturing process can be simplified by including a step of rotating the fabric up and down by 180 DEG so as to form nylon nanofibers and polyvinylidene fluoride nanofibers on both sides of the substrate in the process of producing the filter of the present invention, The unit concept can be introduced into the spinning device to produce a filter capable of mass production.

Description

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

The present invention relates to a filter including a nanofiber and a method of manufacturing the same. More particularly, the present invention relates to a filter comprising a nylon nanofiber and a polyvinylidene fluoride fluoride, PVDF) nanofibers, and a method of manufacturing the same.

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.

SUMMARY 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 filter prepared by electrospinning a polyvinylidene fluoride solution to laminate nylon nanofiber nonwoven fabric and polyvinylidene fluoride nanofiber nonwoven fabric on both sides of a substrate, And a method thereof.

As described above, in the process of forming the nylon nanofiber nonwoven fabric and the polyvinylidene fluoride nanofiber nonwoven fabric on both sides of the base material, a process of rotating the fabric up and down by 180 ° is included, thereby simplifying the manufacturing process, To introduce a unit concept to manufacture a filter capable of mass production.

According to a preferred embodiment of the present invention, there is provided a nonwoven fabric comprising a base material, a first nylon nanofiber nonwoven fabric laminated by electrospinning on one side of the base material and having a fiber diameter of 100 to 150 nm, a first nylon- A first polyvinylidene fluoride nanofiber nonwoven fabric having a fiber diameter of 80 to 150 nm and a second polyvinylidene fluoride nanofiber nonwoven fabric laminated by electrospinning on the other side of the substrate not bonded to the first nylon nanofiber nonwoven fabric and having a fiber diameter of 100 to 150 nm And a second polyvinylidene fluoride nanofiber nonwoven fabric laminated by electrospinning on a second nylon nanofiber nonwoven fabric and a second nylon nanofiber nonwoven fabric and having a fiber diameter of 80 to 150 nm and thermally fusing the same A nylon nanofiber, and a polyvinylidene fluoride nanofiber.

According to another preferred embodiment of the present invention, the first and second nylon nanofiber nonwoven fabrics are prepared by mixing a solution of nylon and polyamide hotmelts. The nylon nanofibers and the polyvinylidene fluoride nanofibers Filter.

According to another preferred embodiment of the present invention, a hot-melt electrospinning layer is provided between the substrate and the first nylon nanofiber nonwoven fabric and between the substrate and the second nylon nanofiber nonwoven fabric. The nylon nanofiber and the polyvinylidene fluoride A filter comprising nanofibers is provided. Wherein the hot melt electroluminescent layer is formed of a polyamide hot melt.

The base material is one selected from the group consisting of a bicomponent base material, cellulose, natural fibers and synthetic fibers. The bicomponent base material may be a sheath-core type, a side by side type or a C type -type).

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 manufacturing 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: preparing a nylon solution by dissolving nylon in a solvent, A polyvinylidene fluoride solution is prepared by dissolving polyvinylidene fluoride in a solvent, and the polyvinylidene fluoride solution is injected into the main tank of the spinning solution of the second and fourth units of the electrospinning device In the first unit of the electrospinning device, a nylon solution is electrospun on one side of the substrate to form a fiber having a fiber diameter of 100 to 150 nm Forming a first nylon nanofiber nonwoven fabric layer on the first nylon nanofiber nonwoven fabric by electrospinning a polyvinylidene fluoride solution on the first nylon nanofiber nonwoven fabric in the second unit of the electrospinning device to form a first polyvinylidene fluoride fiber having a fiber diameter of 80 to 150 nm Lid fluoride nanofibers laminated on the substrate, a step of rotating the upper and lower sides of the fabric consisting of the substrate, the first nylon nanofiber nonwoven fabric and the first polyvinylidene fluoride nanofiber nonwoven fabric by 180 DEG in the flip device, , A step of electroluminating the nylon solution on the other side of the substrate on which the first nylon nanofiber nonwoven fabric is not laminated to form a second nylon nanofiber nonwoven fabric having a fiber diameter of 100 to 150 nm, In the fourth unit, the polyvinylidene fluoride solution is electrospun on the second nylon nanofiber nonwoven fabric, A second nylon nanofiber nonwoven fabric, a first polyvinylidene fluoride nanofiber nonwoven fabric, and a second polyvinylidene fluoride nonwoven fabric and a second polyvinylidene fluoride nonwoven fabric, The present invention also provides a method for manufacturing a filter including nylon nanofibers and polyvinylidene fluoride nanofibers, which comprises thermally fusing a laminated fabric including a nonwoven fabric.

According to another preferred embodiment of the present invention, the step of preparing a nylon solution is a step of mixing nylon and polyamide hot melts and dissolving them in a solvent. The substrate is a two-component substrate, cellulose, natural fiber, , And the two-component substrate is characterized by being a sheath-core type, a side by side type, or a C-type type.

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, comprising the steps of: preparing a nylon solution by dissolving nylon in a solvent, The polyvinylidene fluoride solution was prepared by dissolving polyvinylidene fluoride in a solvent and putting it into the main spinning liquid main tank of the third and sixth units of the electrospinning device , The hot melt is dissolved in a solvent to prepare a hot melt solution, and the solution is put into the main spinning liquid main tank of the first and fourth units of the electrospinning apparatus The method comprising the steps of: electrospinning a hot-melt solution on one side of a substrate in a first unit of an electrospinning apparatus to form a first hot-melt electrospinning layer; forming a first hot- A first nylon nanofiber nonwoven fabric having a fiber diameter of 100 to 150 nm is laminated by electrospinning the solution, a polyvinylidene fluoride solution is electrospun on the first nylon nanofiber nonwoven fabric in the third unit of the electrospinning device Forming a laminate of a first polyvinylidene fluoride nanofiber nonwoven fabric having a fiber diameter of 80 to 150 nm on a base material, a first hot-melt electrospun layer, a first nylon nanofiber nonwoven fabric and a first polyvinylidene fluoride nano- The first and second hot melt electroluminescent layers are not laminated in the fourth unit of the electrospinning device; A step of electrospinning a hot-melt solution on the other side of the substrate to form a second hot-melt electrospinning layer; a step of electrospinning a nylon solution on the second hot-melt electrospinning layer in a fifth unit of the electrospinning device, Forming a second nylon nanofiber nonwoven fabric having a fiber diameter of 80 to 150 nm on the second nylon nanofiber nonwoven fabric in a sixth unit of the electrospinning device by electrospinning the polyvinylidene fluoride solution on the second nylon nanofiber nonwoven fabric, Forming a first polyvinylidene fluoride nanofiber nonwoven fabric, a first nylon nanofiber nonwoven fabric, a first hot-melt electrospinning layer, a substrate, a second hot-melt electrospinning layer, a second polyvinylidene fluoride nanofiber nonwoven fabric, A step of thermally fusing a fabric laminated in the order of a nylon nanofiber nonwoven fabric and a second polyvinylidene fluoride nanofiber nonwoven fabric It provides a nylon nanofibers and method of manufacturing a polyvinylidene fluoride filter including a nanofiber as claimed.

According to still another preferred embodiment of the present invention, the first and second hot-melt electrospun layers are formed of a polyamide-based hot melt, and the substrate is one selected from the binary material, cellulose, natural fiber and synthetic fiber . Further, the binary substrate is characterized by being a sheath-core type, a side by side type or a C-type type.

The filter manufactured according to the present invention has a laminated structure of a nylon nanofiber nonwoven fabric and a polyvinylidene fluoride nanofiber nonwoven fabric sequentially on both sides of a substrate to reduce the pressure loss and improve the filtration efficiency and the life of the filter It is possible to extend.

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.

Further, since the electrospinning device for manufacturing the filter of the present invention is constituted by at least two units, continuous electrospinning is possible, and there is an advantage that mass production of a filter using nanofibers is possible.

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 diagram showing a filter including nylon nanofibers and polyvinylidene fluoride nanofibers 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 nylon nanofiber and the polyvinylidene fluoride nanofiber of the present invention. FIG. 9 is a side view schematically 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, in which at least one unit 10a, 10b, 10c, 10d is spaced apart by a predetermined distance Each of the units 10a, 10b, 10c, and 10d emits the same polymer spinning solution separately, or the polymer spinning solution having a different material is electrospun individually to produce a filter material such as a nonwoven fabric.

For this purpose, the units 10a, 10b, 10c and 10d are 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, A nozzle block 11 for discharging the polymer spinning solution filled in the spinning solution main tank 8 and provided with a plurality of nozzles 12 in the form of a pin, A collector 13 spaced from the nozzle 12 by a predetermined distance and a voltage generator 14a, 14b, 14c, 14d for generating a voltage to the collector 13 to accumulate the polymer spinning solution injected from the nozzle 12, .

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.

Here, a unit 10a is provided in front of a unit 10a located at the tip of each unit 10a, 10b, 10c, 10d of the electrospinning device 1, and is supplied into the unit 10a, A nano fiber nonwoven fabric is laminated on the rear side of the unit 10d located at the rear end of each unit 10a, 10b, 10c, and 10d, and a feeding roller 3 for feeding the long sheet 15, Up rollers 5 for winding the elongated sheet 15 to be formed.

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

The material of the polymer solution to be radiated through each of the units 10a, 10b, 10c and 10d of the electrospinning device 1 is not particularly limited. For example, polypropylene (PP), polyethylene terephthalate (PET), polyvinylidene fluoride, nylon, polyvinyl acetate, polymethylmethacrylate, polyacrylonitrile (PAN), polyurethane (PUR), polybutylene terephthalate (PEI), poly (ethylene terephthalate) (PEI), polyvinylidene chloride (PVA), polyvinyl chloride, polyethyleneimine, polyolefin, polylactic acid (PLA), polyvinyl acetate Polypropylene (PP), heat-resistant polymeric materials such as polyamide, polyimide, polyamideimide, poly (meth) acrylate, and poly - phenylene Aromatic polyesters such as polyethylene terephthalate, polyethylene naphthalate and the like, polytetrafluoroethylene, polydiphenoxaphospazene, polyphenylene sulfide, polyphenylene sulfide, polyphenylene sulfide, poly Polyphosphazenes such as bis [2- (2-methoxyethoxy) phosphazene], polyurethane copolymers including polyurethane and polyether urethane, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, etc. Of the polymer is preferably used in a commercial manner.

The spinning liquid supplied through the nozzles 12 in the units 10a, 10b, 10c, and 10d is a solution in which a polymer as a synthetic resin material capable of electrospinning is dissolved in an appropriate solvent. But are not limited to, those which can be dissolved, for example, phenol, formic acid, sulfuric acid, m-cresol, thifluoroacetone hydride / dichloromethane, water, N-methylmorpholine N-oxide, , 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 hexane, tetrachlorethylene, acetone, glycol Propylene glycol, diethylene glycol, ethylene glycol, halogen compounds such as trichlorethylene, dichloromethane, aromatic compounds such as toluene, xylene, Cyclohexanone as a group of an alicyclic ring compound, n-butyl acetate as an ester group, ethyl acetate, butyl cellosolve as an aliphatic ether group, acetic acid 2-ethoxyethanol, 2-ethoxyethanol, 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, 10b, 10c and 10d 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, 220 and a regeneration tank 230 are provided in the overflow device 200, respectively.

The overflow device 200 is provided in each unit 10a, 10b, 10c and 10d of the electrospinning device 1 in the embodiment of the present invention. However, each of the units 10a, 10b, 10c and 10d It is also possible that the overflow device 200 is provided in any one of the units 10a to 10d and the units 10b, 10c and 10d are integrally connected to the overflow device 200. [

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 control method as described above is controlled according to the liquid surface height of the spinning liquid measured by the second sensor 222 provided in the intermediate tank 230 to be described later.

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, VOCs (Volatile Organic Compounds) generated during spinning of the polymer spinning solution are condensed through the nozzles 12 to the units 10a, 10b, 10c and 10d of the electrospinning device 1, A distillation unit 320 for distilling and liquefying the condensed VOC through the condensing unit 310 and a solvent storage unit 330 for storing the liquefied solvent through the distillation unit 320, The VOC recycling apparatus 300 includes the VOC recycling apparatus 300.

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, 10b, 10c and 10d is introduced into the condenser 310 and the VOC in the liquefied state generated in the condenser 310 is supplied to the solvent storage device Pipes 311 and 331 are connected to each other.

That is, pipes 311 and 331 for interconnecting the units 10a, 10b, 10c and 10d 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, 10b, 10c, and 10d and condensing and liquefying the vaporized VOC, And a solvent storage device 330 for storing the liquefied VOC through the distillation device 320. The distillation device 320 may be a condenser, ).

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

That is, the units 10a, 10b, 10c and 10d and the condenser 310, the condenser 310 and the distillation unit 320, and the distillation unit 320 and the solvent storage unit 330 are interconnected Pipes 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.

It is preferable that the case 18 constituting each unit 10a, 10b, 10c and 10d of the electrospinning device 1 is made of a conductor, but the case 18 may be made of an insulator, 18 may be used in combination of a conductor and an insulator, 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, 14b, 14c, and 14d can be monitored, the abnormality of the electrospinning apparatus 1 can be detected early, The continuous operation of the electrospinning device 1 for a long time is possible, 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 installed in each unit 10a, 10b, 10c, 10d of the electrospinning device 1 according to the present invention, And is connected to the generator 14.

2, the nozzle block 11, which is provided in each of the units 10a, 10b, 10c, and 10d and to which the polymer solution is supplied by a plurality of nozzles 12 provided on the unit, A temperature control device 60 is provided in the tube 40 of the main body 40.

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, in order to adjust the feeding speed of the elongated sheet 15 which is fed into and fed into each of the units 10a, 10b, 10c and 10d of the electrospinning device 1 according to the present invention, An auxiliary transfer device 16 is provided.

The auxiliary conveying device 16 is provided with a long sheet 15 for facilitating the detachment and conveyance of the long sheet 15 attached by the electrostatic attraction to the collector 13 provided in each unit 10a, 10b, 10c, And an auxiliary belt roller 16b for supporting and rotating the auxiliary belt 16a. The auxiliary belt 16a rotates in synchronization with the conveyance speed of the auxiliary belt 16a.

The auxiliary belt 16a is rotated by the rotation of the auxiliary belt roller 16b and the auxiliary belt 16a is rotated by the rotation of the auxiliary belt 16a so that the long sheet 15 is rotated by the units 10a, And 10d, to which an auxiliary belt roller 16b of the auxiliary belt roller 16b is rotatably connected to the motor.

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. 1, a thickness measuring device 70 is provided between each unit 10a, 10b, 10c, and 10d of the electrospinning device 1, and the thickness measuring device 70 And controls the feed velocity V and the nozzle block 11 according to the thickness measured by the nozzle.

When the thickness of the nanofiber nonwoven fabric discharged from each unit 10a, 10b, 10c of the electrospinning apparatus 1 is measured to be thinner than the deviation amount by the above-described structure, the following units 10b, 10c, The discharge amount of the nanofiber nonwoven fabric per unit area is increased by decreasing the conveyance speed V of the nozzle block 11 or increasing the discharge amount of the nozzle block 11 and regulating the voltage intensity of the voltage generators 14a, 14b, 14c, and 14d So that the thickness can be increased.

When the thickness of the nanofiber nonwoven fabric discharged from the units 10a, 10b and 10c of the electrospinning device 1 is measured to be thicker than the deviation amount, the feed speed V of the next unit 10b, 10c, By reducing the discharge amount of the nozzle block 11 and controlling the voltage intensity of the voltage generating devices 14a, 14b, 14c and 14d to reduce the discharge amount of the nanofiber nonwoven fabric per unit area to reduce the amount of lamination The thickness of the nonwoven fabric can be made thinner, and thus a 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 regulating device 30 includes a buffering section 31 formed between each unit 10a, 10b, 10c and 10d of the electrospinning device 1 and a buffering section 31 formed on the buffering section 31 A pair of support rollers 33 and 33 'for supporting the long sheet 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 disposed in the longitudinal direction of the elongated sheet 15 in which the nanofiber nonwoven fabric is laminated by the spinning solution injected by the nozzles 12 in the respective units 10a, 10b, 10c and 10d 10b, 10c, and 10d, respectively, for supporting the conveyance of the elongate sheet 15 during conveyance, and are provided on the line and the rear end of the buffer zone 31 formed between the units 10a, 10b, 10c, and 10d, respectively.

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 the respective units 10a, 10b, 10c and 10d are adjusted.

For this purpose, a sensing sensor (not shown) for sensing the feeding speed of the long sheets 15a and 15b in the units 10a, 10b, 10c and 10d is provided, and each unit 10a A main controller 7 is provided for controlling the movement of the adjusting roller 35 in accordance with the feeding speed of the long sheets 15a and 15b in the fixing rollers 10a, 10b, 10c and 10d.

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, 10b, 10c, and 10d and the conveying speed of the long sheets 15a and 15b is sensed. The auxiliary belt 16a or the auxiliary belt 16a provided on the outer side of the collector 13 for transferring the long sheets 15a and 15b (Not shown) for driving the auxiliary belt roller 16b or the motor (not shown), and the control unit controls the movement of the adjustment roller 35 accordingly.

With the above structure, the conveyance speed of the long sheets 15a in the units 10a, 10b, 10c located at the front ends of the units 10a, 10b, 10c, 5 to 6, when it is detected that the feeding speed of the long sheets 15b in the units 10b, 10c and 10d is faster than the feeding speed of the long sheets 15b in the units 10b, 10c and 10d, Is provided between the pair of support rollers 33 and 33 'so as to prevent the elongated sheet 15a from being sagged, while the adjustment roller 35, on which the elongate sheet 15 is wound, 10b and 10c positioned at the leading end of the long sheets 15 conveyed to the units 10b, 10c and 10d located at the rear end in the units 10a, 10b and 10c of the units 10a, 10b and 10c, The elongated sheet 15a, which is excessively conveyed to the buffer zone 31 located between the units 10a, 10b and 10c, The conveying speed of the long sheets 15a in the units 10a, 10b and 10c to be conveyed becomes equal to the conveying speed of the long sheets 15b in the units 10b, 10c and 10d positioned at the succeeding stage, Thereby preventing sagging and wrinkling of the sheet 15a.

On the other hand, when the sensors 10a, 10b, 10c are positioned at the rear end of the unit 10a, 10b, 10c, the units 10b, 10c 7 to 8, the conveying direction of the long sheets 15b (10b, 10c, 10d) conveyed in the units 10b, 10c, 10d located at the rear end is determined to be slower than the conveying speed of the long sheets 15b Is provided between the pair of support rollers 33 and 33 'so as to prevent the tearing of the long rollers 15a and 15b and the adjustment rollers 35 on which the long rollers 15 are wound, 10b and 10c positioned at the leading ends of the long sheets 15 conveyed to the units 10b, 10c and 10d located at the rear end of the units 10a, 10b and 10c, The elongated sheet 15a wound on the regulating roller 35 is inserted into the buffering section 31 positioned between the unit (10a, 10b, 10c, 10d) 10b, 10c and 10d of the units 10b, 10c and 10d located at the rear end of the long sheets 15a in the units 10a, 10b and 10c located at the front ends, So as to prevent the long sheet 15b from being broken.

By adjusting the feeding speed of the long sheet 15b to be fed into the units 10b, 10c and 10d located at the rear end of each of the units 10a, 10b, 10c and 10d by the above-mentioned structure, The long sheets 15a in the units 10a, 10b, 10c and 10c located at the rear ends of the long sheets 15b in the units 10b, 10c and 10d located at the rear end of the long sheets 15a, The effect of equalizing the speed can be obtained.

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 (not shown) for rotating the elongate sheet 15 between the unit 10b and the unit 10c positioned in the middle among the units 10a, 10b, 10c and 10d applied to the electrospinning device 1, (Not shown).

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 °.

The auxiliary transfer device 16 including the auxiliary belt 16a and the auxiliary belt roller 16b has the structure described above and the units 10a, 10b, 10c and 10d located at the tip ends of the units 10a, 10b, 10c and 10d, 10b so that the polymer solution is radiated to the lower surface of the elongated sheet 15, and the laminated elongated sheet 15 passes through the flip device 110 so that the lower surface thereof is positioned on the upper side and the upper surface is positioned on the lower side, A nozzle block 11 for electric radiation and a nozzle 12 for rotating the elongated sheet 15 such that the rotated elongate sheet 15 is fed to the units 10c and 10d located at the rear end and then the polymer solution is radiated to the lower surface thereof, The polymeric spinning solution can be electrospun on the lower surface and the upper surface of the elongate sheet 15 without changing the positions of the units 10a, 10b, 10c, and 10d.

An embodiment of the present invention is characterized in that the flip device 110 is provided between the unit 10b and the unit 10c positioned in the middle of each unit 10a, 10b, 10c, 10d of the electrospinning device 1 The flip device 110 is provided between the units 10a, 10b and 10c and the units 10b, 10c and 10d so as to rotate the elongate sheet 15 repeatedly And the polymeric spinning solution may be electrospun on both sides of the long sheet 15 while rotating.

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 of the nanofiber nonwoven fabric manufactured through the electrospinning device 1 at the rear of the unit 10d located at the rearmost end of each unit 10a, 10b, 10c, 10d of the electrospinning device 1 A ventilation rate measuring device 80 for measuring the ventilation rate 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 from the polymer spinning solution is measured largely through the electrospinning device 1, the conveyance speed V of each unit 10a, 10b, 10c, 10d is decreased, (14a, 14b, 14c, 14d) is controlled to increase the discharge amount of the nanofibers per unit area, thereby reducing the air permeability.

When the air permeability of the nanofiber nonwoven fabric discharged from the polymer spinning solution through the electrospinning device 1 is measured to be low, the feeding speed V of each unit 10a, 10b, 10c, 10d is increased, The discharge amount of the block 11 is decreased and the discharge amount of the nanofibers per unit area is reduced by controlling the intensity of the voltage of the voltage generating devices 14a, 14b, 14c, and 14d to reduce the amount of lamination.

As described above, by measuring the air permeability of the nanofiber nonwoven fabric and controlling the feeding speed of each unit 10a, 10b, 10c, 10d and the nozzle block 11 according to the air permeability, It is possible to manufacture.

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 unit 7 includes a nozzle block 11, voltage generators 14a, 14b, 14c and 14d, a thickness measuring device (70), the long sheet conveying speed regulating device (30) and the air permeability measuring device (80).

A laminating device 90 for laminating the nanofiber nonwoven fabric electrospun through each unit 10a, 10b, 10c and 10d of the electrospinning device 1 is provided in each of the units 10a, 10b, 10c and 10d , And performs a post-process of the nanofiber nonwoven fabric, which is provided behind the unit 10d positioned at the rearmost end of the nano-fiber nonwoven fabric and is 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 nylon solution and a polyvinylidene fluoride solution are used as a polymer spinning solution, and a base material is used as a long sheet (15). The substrate is characterized in that it is one selected from the two-component substrate, the cellulose substrate or the synthetic fiber substrate. In the case of the above two-component substrate, it is possible to use a sheath-core type, a side-by-side type or a C-type type.

First, a nylon solution in which nylon is dissolved in an organic solvent is supplied to a spinning liquid main tank 8 connected to the first unit 10a and the third unit 10c of the electrospinning apparatus, and polyvinylidene fluoride is added to an organic solvent The dissolved polyvinylidene fluoride solution is supplied to the spinning liquid main tank 8 connected to the second unit 10b and the fourth unit 10d of the electrospinning apparatus. The spinning liquid main tank 8 connected to each of the units 10a, 10b, 10c and 10d is connected to a nozzle block (not shown) in the units 10a, 10b, 10c and 10d via a metering pump (12) of the nozzle (11). In the first unit 10a of the electrospinning device 1, the nylon solution is electrospun on the substrate to form a first nylon nanofiber nonwoven fabric. At this time, a high voltage is applied to the voltage generator 14a of the first unit 10a so that the fiber diameter of the first nylon nanofiber nonwoven fabric is 100 to 150 nm. In the second unit 10b, the polyvinylidene fluoride solution is electrospun on the first nylon nanofiber nonwoven fabric to form a first polyvinylidene fluoride nanofiber nonwoven fabric laminate. At this time, a high voltage is applied to the voltage generating device of the second unit 10b so that the fiber diameter of the first polyvinylidene fluoride nanofiber nonwoven fabric is 80 to 150 nm. Thereafter, the base material, the first nylon nanofiber nonwoven fabric and the first polyvinylidene fluoride nanofiber nonwoven fabric are separated by the flip device 110 provided at the rear end of the second unit 10b of the electrospinning device 1 The top and bottom of the fabric are rotated by 180 °. That is, the upper end of the fabric is changed to the lower end, and the lower end of the fabric is rotated to change its position to the upper end. In other words, the top and bottom of the fabric are rotated by 180 ° such that the other side of the base material on which the first nylon nanofiber nonwoven fabric is not laminated faces the nozzle block 11 of the electrospinning device 1. Thereafter, in the third unit 10c, the nylon solution is electrospun on the other side of the substrate at a high voltage to form a second nylon nanofiber nonwoven fabric having a fiber diameter of 100 to 150 nm. In the fourth unit 10d, the polyvinylidene fluoride solution is electrospun into the second nylon nanofiber nonwoven fabric at a high voltage to form a second polyvinylidene fluoride nanofiber nonwoven fabric having a fiber diameter of 80 to 100 nm do.

Here, the intensity of the voltage supplied to each unit 10a, 10b, 10c, 10d is preferably at least 15 kV or more.

The above description also shows that the first unit 10a is rotated by the rotation of the feeding roller 3 which is operated by the driving of a motor (not shown) and the auxiliary feeding device 16 which is driven by the rotation of the feeding roller 3, The first and second polyvinylidene fluoride nanofiber nonwoven fabrics are transferred to the second unit 10b by a continuous electrospinning process on both sides of the substrate while repeating the above process Respectively.

In the embodiment of the present invention, the nylon solution in which nylon is dissolved in a solvent is used as a spinning solution, but it is also possible to use a spinning solution in which nylon and polyamide hotmelts are mixed. For example, it is possible to emit a spinning solution in which nylon and hot melt are mixed in the first unit 10a and the third unit 10c of the electrospinning device 1. [

In addition, it is also possible to radiate a hot-melt solution in which a polyamide-based hot melt is dissolved in a solvent. For example, when the flip device is provided in the middle of the electrospinning device, the hot melt solution is electrospun in the first unit 10a and the fourth unit 10d, and the second unit 10b, The nylon solution is electrospun in the fifth unit (not shown), and the polyvinylidene fluoride solution is electrospun in the third unit 10c and the sixth unit (not shown).

As described above, when the hot melt is mixed with the nylon to produce a spinning solution or a hot melt solution is spun, the adhesion between the nylon nanofiber nonwoven fabric and the substrate is strengthened to prevent the nylon nanofiber nonwoven fabric from being separated from the base material.

The nylon nanofiber nonwoven fabric and the polyvinylidene fluoride nanofiber nonwoven fabric are applied with a high voltage in order to make the fiber diameters small. However, in the present invention, between the nozzle 12 and the collector 13 It is also possible to make the fiber diameter smaller by decreasing the distance or decreasing the viscosity of the spinning solution.

In the first unit 10a of the electrospinning device 1, a first nylon nanofiber nonwoven fabric having a fiber diameter of 80 to 150 nm is laminated on one side of the substrate, A first polyvinylidene fluoride nanofiber nonwoven fabric having a fiber diameter of 100 to 150 nm is laminated on the first nylon nanofiber nonwoven fabric. In the flip device 110 provided thereafter, the fabric composed of the base material, the first nylon nanofiber nonwoven fabric, and the first polyvinylidene fluoride nanofiber nonwoven fabric is rotated 180 degrees, 1 nylon nanofiber nonwoven fabric is laminated on the other side of the base material in which the nylon nanofiber nonwoven fabric is not laminated, a second nylon nanofiber nonwoven fabric having a fiber diameter of 80 to 150 nm is laminated on the other side of the base material, A second polyvinylidene fluoride nanofiber nonwoven fabric having a diameter of 100 to 150 nm is laminated. The fabric laminated in this order of the first polyvinylidene fluoride nanofiber nonwoven fabric, the first nylon nanofiber nonwoven fabric, the substrate, the second nylon nanofiber nonwoven fabric, and the second polyvinylidene fluoride nanofiber nonwoven fabric, The filter of the present invention is manufactured.

Example 1

Nylon 6 chips having a relative viscosity of 2.3 in a 96% sulfuric acid solution were dissolved in formic acid to prepare a nylon solution. The solution was added to the main tank of the spinning solution main body of each of the first and third units of the electrospinning apparatus, Vinylidene fluoride was dissolved in dimethylacetamide to prepare a polyvinylidene fluoride solution, which was then added to the main spinning liquid main tank of the second and fourth units of the electrospinning apparatus, respectively. In the first unit of the electrospinning device, a first nylon nanofiber nonwoven fabric having a thickness of 2 탆 and a fiber diameter of 160 nm was laminated by applying the nylon solution to one side of the cellulose base material by applying an applied voltage of 17 kV. In the second unit of the electrospinning device, an applied voltage of 20 kV was applied, and the polyvinylidene fluoride solution was electrospun on the first nylon nanofiber nonwoven fabric to obtain a first polyvinylidene fluoride having a thickness of 2 탆 and a fiber diameter of 130 nm Rid nanofibrous nonwoven fabric was laminated. The first nylon nanofiber nonwoven fabric and the first polyvinylidene fluoride nanofiber nonwoven fabric laminated in this order on the one side of the cellulose substrate and the cellulose substrate in the flip device located at the rear end of the second unit, The upper and lower sides of the fabric are rotated by 180 DEG such that the other side of the cellulose base material on which the nanofiber nonwoven fabric is not laminated faces the nozzle block of the electrospinning device. In the third unit of the electrospinning device, a second nylon nanofiber nonwoven fabric having a thickness of 2 탆 and a fiber diameter of 160 nm was formed by electrospinning the nylon solution on the other side of the cellulose substrate with an applied voltage of 17 kV. In the fourth unit of the electrospinning device, an applied voltage of 20 kV was applied and the polyvinylidene fluoride solution was electrospun on the second nylon nanofiber nonwoven fabric to obtain a second polyvinylidene fluoride having a thickness of 2 탆 and a fiber diameter of 130 nm Rid nanofibrous nonwoven fabric was laminated. 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%. After electrospinning, the laminated fabric was thermally fused in a laminating apparatus to finally produce a filter.

Example 2

In preparing the nylon solution, nylon 6 chips having a relative viscosity of 2.3 and a polyamide resin for hot melt having a number average molecular weight of 3,000 in a 96% sulfuric acid solution were dissolved in formic acid to prepare a nylon solution. Lt; / RTI >

Example 3

A polyamide resin for hot melt having a number average molecular weight of 3,000 was dissolved in formic acid to prepare a hot melt solution, which was then fed to the spinning liquid main tank of the first and fourth units of the electrospinning apparatus. The relative viscosity was 2.3 Nylon 6 chips were dissolved in formic acid to prepare a nylon solution, and the solution was added to the spinning liquid main tank of each of the second and fifth units of the electrospinning apparatus. Polyvinylidene fluoride having a weight average molecular weight of 50,000 was dissolved in dimethylacetamide And a polyvinylidene fluoride solution was prepared and added to the spinning liquid main tank of the third and sixth units of the electrospinning device, respectively. In the first unit of the electrospinning device, an applied voltage of 20 kV was applied to electrospun the hot melt solution on one side of the cellulose substrate to form a first hot-melt electrospun layer. In the second unit of the electrospinning device, a first nylon nanofiber nonwoven fabric having a thickness of 2 탆 and a fiber diameter of 140 nm was laminated by applying an applied voltage of 20 kV to the first hot-melt electrospinning layer by electrospinning the nylon solution . In the third unit of the electrospinning device, the applied voltage was set at 23 kV, and the polyvinylidene fluoride solution was electrospun on the first nylon nanofiber nonwoven fabric to prepare a first polyvinylidene fluoride having a thickness of 2 탆 and a fiber diameter of 100 nm Rid nanofibrous nonwoven fabric was laminated. In the flip device located at the rear end of the third unit, the first hot-melt electroluminescent layer laminated on one side of the cellulose substrate and the cellulose substrate, the first nylon nanofiber nonwoven fabric and the first polyvinylidene fluoride nanofiber nonwoven fabric are laminated in this order And the other side of the cellulose substrate on which the first hot-melt electrospun layer is not laminated is rotated 180 degrees above and below the fabric so as to face the nozzle block of the electrospinning device. In the fourth unit of the electrospinning device, the applied voltage is set to 20 kV, and the hot-melt spinning solution is electrospun on one surface of the cellulose base material facing the nozzle block to laminate the second hot-melt electrospinning layer. In the fifth unit of the electrospinning device, a second nylon nanofiber nonwoven fabric having a thickness of 2 탆 and a fiber diameter of 140 nm was laminated by applying the nylon solution to the second hot-melt electrospinning layer at an applied voltage of 20 kV . In the sixth unit of the electrospinning device, an applied voltage of 23 kV was applied, and the polyvinylidene fluoride solution was electrospun on the second nylon nanofiber nonwoven fabric to obtain a second polyvinylidene fluoride having a thickness of 2 m and a fiber diameter of 100 nm Nanofiber nonwoven fabric was laminated. 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%. After the electrospinning, the laminated fabrics were thermally fused to each other in a laminating apparatus to finally produce a filter.

Comparative Example 1

The cellulose substrate used in Example 1 was used as a filter media.

Comparative Example 2

Nylon 6 was electrospun on both sides of the cellulose substrate to laminate nylon 6 nanofiber nonwoven fabric to prepare a filter.

- 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 to 3 and Comparative Example 1 were measured by the above-mentioned methods and are shown in Table 1.

Example 1 Example 2 Example 3 Comparative Example 1 0.35 탆 DOP
Filtration efficiency (%) 95 94 95 70

As described above, the filter including the polyvinylidene fluoride nanofiber nonwoven fabric manufactured through the embodiment of the present invention has a higher filtration efficiency than the comparative example.

- 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 life was measured accordingly. Data comparing Examples 1 to 3 and Comparative Example 1 are shown in Table 2.

Example 1 Example 2 Example 3 Comparative Example 1 Pressure drop (in.w.g) 4.4 4.2 4.0 8.0 Filter life (month) 6.0 6.0 6.1 3.2

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 the separation of the nanofiber nonwoven fabric and the filter substrate by the ASTM D 2724 method, the nanofiber nonwoven fabric was not desorbed in the filter prepared in Examples 2 and 3, 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, 10c, 10d: unit,
11: nozzle block, 12: nozzle,
13: Collector,
14, 14a, 14b, 14c and 14d: voltage generating device,
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 (14)

delete delete delete delete delete A bicomponent substrate selected from sheath-core, side by side, or seed type (C-type);
A first nylon nanofiber nonwoven fabric laminated by electrospinning on one side of the component substrate and having a fiber diameter of 100 to 150 nm;
A first polyvinylidene fluoride nanofiber nonwoven fabric laminated on the first nylon nanofiber nonwoven fabric by electrospinning and having a fiber diameter of 80 to 150 nm;
A second nylon nanofiber nonwoven fabric laminated by electrospinning on the other side of the substrate not bonded to the first nylon nanofiber nonwoven fabric and having a fiber diameter of 100 to 150 nm;
And a second polyvinylidene fluoride nanofiber nonwoven fabric laminated on the second nylon nanofiber nonwoven fabric by electrospinning and having a fiber diameter of 80 to 150 nm and thermally fusing the same, A filter comprising vinylidene fluoride nanofibers.
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,
Dissolving nylon in a solvent to prepare a nylon solution, charging the solution into the spinning liquid main tank of the first and third units of the electrospinning device, dissolving polyvinylidene fluoride in a solvent to prepare a polyvinylidene fluoride solution Into the spinning liquid main tank of the second and fourth units of the electrospinning apparatus;
Forming a first nylon nanofiber nonwoven fabric layer having a fiber diameter of 100 to 150 nm by electrospinning the nylon solution on one side of the base material in the first unit of the electrospinning device;
Forming a first polyvinylidene fluoride nanofiber having a fiber diameter of 80 to 150 nm by electrospinning the polyvinylidene fluoride solution on the first nylon nanofiber nonwoven fabric in a second unit of the electrospinning apparatus ;
Rotating the upper and lower sides of the fabric consisting of the base material, the first nylon nanofiber nonwoven fabric and the first polyvinylidene fluoride nanofiber nonwoven fabric by 180 DEG in the flip device;
The third unit of the electrospinning device is electrospinning the nylon solution on the other side of the substrate on which the first nylon nanofiber nonwoven fabric is not laminated to form a second nylon nanofiber nonwoven fabric having a fiber diameter of 100 to 150 nm step;
Forming a second polyvinylidene fluoride nanofiber having a fiber diameter of 80 to 150 nm by electrospinning the polyvinylidene fluoride solution on the second nylon nanofiber nonwoven fabric in a fourth unit of the electrospinning apparatus ; And
Thermally fusing a laminated fabric comprising the substrate, the first nylon nanofiber nonwoven fabric, the second nylon nanofiber nonwoven fabric, the first polyvinylidene fluoride nanofiber nonwoven fabric, and the second polyvinylidene fluoride nanofiber nonwoven fabric; Wherein the nylon nanofibers and the polyvinylidene fluoride nanofibers are in contact with each other.
8. The method of claim 7,
Wherein the step of preparing the nylon solution is a step of mixing the nylon and the polyamide hot melt in a solvent and dissolving the nylon and the polyamide hotmelts in a solvent, wherein the nylon nanofiber and the polyvinylidene fluoride nanofiber are mixed.
8. The method of claim 7,
Wherein the base material is any one selected from the group consisting of binary materials and cellulose. 10. The method of claim 9,
Wherein the binary material is any one selected from the group consisting of a sheath-core type, a side by side type, and a C-type type. The nylon nanofiber and the polyvinylidene fluoride nano- Wherein the filter comprises fibers.
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,
A nylon solution was prepared by dissolving nylon in a solvent, putting it into a spinning liquid main tank of the second and fourth units of the electrospinning apparatus, and dissolving polyvinylidene fluoride in a solvent to prepare a polyvinylidene fluoride solution The hot melt solution is prepared by dissolving the hot melt in a solvent and putting it into the main spinning liquid main tank of the first and fourth units of the electrospinning device step;
Melt-spinning the hot-melt solution on one side of the substrate in a first unit of the electrospinning device to form a first hot-melt electrospun layer;
Electrospinning the nylon solution on the first hot-melt electrospinning layer in a second unit of the electrospinning device to form a first nylon nanofiber nonwoven fabric having a fiber diameter of 100 to 150 nm;
A first polyvinylidene fluoride nanofiber nonwoven fabric having a fiber diameter of 80 to 150 nm is laminated by electrospinning the polyvinylidene fluoride solution on the first nylon nanofiber nonwoven fabric in a third unit of the electrospinning device step;
Rotating the upper and lower sides of the fabric laminated with the substrate, the first hot melt electrospun layer, the first nylon nanofiber nonwoven fabric and the first polyvinylidene fluoride nanofiber nonwoven fabric by 180 DEG in the flip device;
The fourth unit of the electrospinning device comprises the steps of electrospinning the hot melt solution on the other side of the substrate where the first hot melt electroluminescent layer is not laminated to form a second hot melt electroluminescent layer stacked;
Electrospinning the nylon solution on the second hot-melt electrospinning layer in a fifth unit of the electrospinning device to form a second nylon nanofiber nonwoven fabric having a fiber diameter of 100 to 150 nm;
A second polyvinylidene fluoride nanofiber nonwoven fabric having a fiber diameter of 80 to 150 nm is laminated by electrospinning the polyvinylidene fluoride solution on the second nylon nanofiber nonwoven fabric in a sixth unit of the electrospinning device step; And
The first polyvinylidene fluoride nanofiber nonwoven fabric, the first nylon nanofiber nonwoven fabric, the first hot-melt electrospun layer, the substrate, the second hot-melt electrospun layer, the second nylon nanofiber nonwoven fabric, and the second polyvinylidene fluoride nano- And thermally fusing the fabric laminated in the order of the fibrous nonwoven fabric. The method of manufacturing the filter including the nylon nanofiber and the polyvinylidene fluoride nanofiber.
12. The method of claim 11,
Wherein the first and second hot-melt electrospun layers are made of a polyamide-based hot melt.
12. The method of claim 11,
Wherein the base material is any one selected from the group consisting of binary materials and cellulose.
14. The method of claim 13,
Wherein the binary material is any one selected from the group consisting of a sheath-core type, a side by side type, and a C-type type. The nylon nanofiber and the polyvinylidene fluoride nano- Wherein the filter comprises fibers.

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