KR101625083B1 - Filter including nylon nanofiber and its manufacturing method - Google Patents

Abstract

The present invention provides a filter comprising nylon nanofibers, characterized in that a nylon nanofiber nonwoven fabric layer is formed on a first bi-component substrate laminated on a first polyethylene terephthalate substrate, and the polyvinylidene And one surface of the fluoride nanofiber nonwoven fabric layer is bonded to one surface of the second bicomponent substrate laminated on the second polyethylene terephthalate substrate to face each other.

Description

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

The present invention relates to a filter including nanofibers and a method of manufacturing the same. The nanofibers are electrospinned with a nylon solution on a first bi-component substrate laminated on a first polyethylene terephthalate substrate, The present invention relates to a filter including nanofibers produced by joining together a first surface of a second binary component laminated on a polyethylene terephthalate substrate so as to face each other, 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.

Disclosure of the Invention The present invention has been conceived to solve the problems as described above, and it is an object of the present invention to provide a method for producing a nylon nanofiber nonwoven fabric by electrospinning a nylon solution on a first binary material substrate laminated on a first polyethylene terephthalate substrate, And one surface of a second binary material substrate laminated on a second polyethylene terephthalate substrate facing one surface of the nylon nanofiber nonwoven fabric, and a method of manufacturing the same. An object of the present invention is to provide a filter capable of reducing the pressure loss of the conventional filter, increasing the filtration efficiency, and extending the life of the filter, and a method for manufacturing the same.

Another object of the present invention is to produce a filter which does not easily desorb even when the nanofiber nonwoven fabric is laminated by using the two-component base material.

A filter manufactured by introducing the concept of unit into an electrospinning apparatus is capable of mass production and manufacturing a filter of uniform quality.

According to a preferred embodiment of the present invention, there is provided a nonwoven fabric comprising a first polyethylene terephthalate base material, a first two-component base material layer laminated on the first polyethylene terephthalate base material, a nylon nanofiber layer laminated by electrospinning on the first two- A second polyethylene terephthalate substrate laminated on the second two-component substrate, wherein the first and second polyethylene terephthalate base materials, 2 binary material and the nylon nanofiber nonwoven fabric are thermally fused to each other.

According to another preferred embodiment of the present invention, the nylon nanofiber nonwoven fabric comprises a first nylon nanofiber nonwoven fabric layer having a fiber diameter of 150 to 300 nm and a second nylon nanofiber nonwoven fabric layer having a fiber diameter of 100 to 150 nm And a second nylon nanofiber nonwoven fabric layer.

According to another preferred embodiment of the present invention, the binary substrate is one selected from a sheath-core type, a side-by-side type or a C-type type .

According to another preferred embodiment of the present invention, the sheath portion of the sheath-core type two-component base material is 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, the basis weight of the first and second two-component substrates is 10 to 50 g / m 2.

According to another preferred embodiment of the present invention, the basis weight of the polyethylene terephthalate base is 50 to 300 g / m 2.

According to another preferred embodiment of the present invention, there is provided a nozzle assembly comprising two or more units, a nozzle unit of a nozzle block located in the unit, a feeding device being independently connected to the nozzles, and a joining device joining other fabrics, A step of injecting a spinning solution in which nylon is dissolved in a solvent into a feeding device of each unit of the electrospinning device; Each of the units is formed by laminating a nylon nanofiber nonwoven fabric by electrospinning the spinning solution on a first two-component substrate laminated on a first polyethylene terephthalate substrate; Wherein the nylon nanofiber nonwoven fabric comprises a plurality of nylon nanofiber nonwoven fabrics, a plurality of nylon nanofiber nonwoven fabrics, a plurality of nylon nanofiber nonwoven fabrics, 2 binary material, and the first and second polyethylene terephthalate base materials are thermally fused to each other. The present invention also provides a method of manufacturing a filter including the nylon nanofibers.

According to another preferred embodiment of the present invention, the step of laminating the nylon nanofiber nonwoven fabric comprises: forming a first nylon nanofiber nonwoven fabric layer having a fiber diameter of 150 to 300 nm on the first unit of the electrospinning device; And the second unit of the electrospinning apparatus includes a second nylon nanofiber nonwoven fabric layer having a fiber diameter of 100 to 150 nm laminated.

According to another preferred embodiment of the present invention, the binary substrate is one selected from a sheath-core type, a side-by-side type or a C-type type .

According to another preferred embodiment of the present invention, the sheath portion of the sheath-core type two-component base material is 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, the basis weight of the first and second two-component substrates is 10 to 50 g / m ² .

According to another preferred embodiment of the present invention, the basis weight of the first and second polyethylene terephthalate base materials is 50 to 300 g / m ² .

As described above, according to the filter of the present invention having the above-described structure, since the nanofiber nonwoven fabric is laminated on the filter base material, the pressure loss is made smaller than that of the conventional filter, the filtration efficiency is increased, It is possible.

Further, there is an effect that the separation between the nanofibers and the substrate is not likely to occur even without using an adhesive such as hot melt.

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 sectional view of a filter according to 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 cross-sectional view of the filter according to the present invention. FIG. 9 is a side view schematically showing the operation of the long sheet feed speed adjusting 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 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, 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 result, the required amount of 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.

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 adjusting the conveying speed of the long sheet 15 to be drawn into and fed 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.

Meanwhile, in the embodiment of the present invention, the auxiliary transfer device 16 is composed of the auxiliary belt roller 16b and the auxiliary belt 16a which can be driven by a motor. However, as shown in FIG. 12, 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, any roller having a low coefficient of friction is not limited in its shape and configuration, 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 distal end portion of the electrospinning device 1 is measured to be thinner than the deviation amount by the above 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 9 is disposed so as to face upward and downward with the elongated sheet 15 inserted and supplied therebetween. The thickness measuring device 9 measures the distance to the top or bottom of the elongate 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 using an ultrasonic longitudinal wave and a transverse wave to calculate the thickness of the object 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.

Meanwhile, the thickness of the nanofiber nonwoven fabric of the long sheet 15 to be transported after the polymer spinning solution is sprayed and laminated to the electrospinning device 1 according to the present invention is measured to determine the feeding speed of the long sheet 15 and the thickness The elongated sheet conveying speed regulating device 30 for controlling the conveying speed of the long sheet 15 is further provided on the electrospinning device 1. The thickness measuring device 70 controls the thickness 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 The unit 10b positioned at the front end of the adjustment roller 35 and the unit 10b positioned at the rear end of the unit 10b are moved in the upward direction, The elongated sheet 15a wound on the regulating roller 35 is guided to the buffering zone 31 which is conveyed outside the unit 10a located at the front end of the sheet 15 and located between the units 10a and 10b To the unit 10b located at the rear end, and is supplied to the unit 10a located at the front end, The conveying speed of the long sheet 15b is controlled so that the conveying speed of the long sheet 15b is equal to the conveying speed of the long sheet 15b in the unit 10b positioned at the succeeding stage.

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 first unit 10b becomes equal to the conveying speed of the long sheet 15a in the unit 10a located at the leading end thereof.

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 each of the units 10a and 10b of the electrospinning device 1 is measured largely, the feeding speed V of the unit 10b positioned at the rear end portion is delayed, The discharge amount of the nozzle block 11 is increased and the intensity of the voltage of the voltage generating devices 14a and 14b is regulated to increase the discharge amount of the nanofibers per unit area to thereby reduce the air permeability.

When the air permeability of the nanofiber nonwoven fabric discharged through the units 10a and 10b of the electrospinning device 1 is measured to be small, the feeding speed V of the unit 10b positioned at the rear end is increased, The discharge amount of the nozzle block 11 is reduced 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 and 14b to reduce the amount of lamination to increase the air permeability.

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. [

Here, the laminating apparatus 100 of the electrospinning apparatus 1 according to the present invention is provided. The laminating apparatus 100 bonds a substrate (not shown) onto the nanofiber nonwoven fabric onto which the polymer spinning solution is radiated on the long sheet 15 through the units 10a and 10b.

At this time, the lapping apparatus 100 is provided below the nanofiber nonwoven fabric, and the base material supplied through the lapping apparatus 100 is bonded to the lower surface of the nanofiber nonwoven fabric.

In an embodiment of the present invention, the laminate device 100 is provided below the nanofiber nonwoven fabric so that the base material is bonded to the lower surface of the nonwoven fabric, It is also possible that the device 100 is provided on top of the nanofiber nonwoven fabric.

It is also possible that the lamination device 100 is provided on the upper and lower surfaces of the nanofiber nonwoven fabric so as to bond the base material to the upper and lower surfaces of the nanofiber nonwoven fabric.

Hereinafter, a method of manufacturing the filter including the nylon nanofibers of the present invention will be described using the electrospinning device.

In the present invention, two units (10a, 10b) are used in the electrospinning apparatus, nylon is used as the polymer, and a first bicomponent substrate laminated on the first polyethylene terephthalate substrate is used as the long sheet do. The fiber-forming polymer of the binary component used in the invention may be a polyester including polyethylene terephthalate, polyethylene naphthalate, polypropylene terephthalate, and polybutylene terephthalate, and polypropylene terephthalate may also be polytrimethylene terephthalate And polybutylene terephthalate such as phthalate and polytetramethylene terephthalate.

The two-component base material in the present invention is most preferably polyethylene terephthalate to which two components having different melting points are bonded. 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 manufacture the filter of the present invention, a nylon solution in which nylon is dissolved in an organic solvent is first supplied to a spinning liquid main tank 8 connected to each unit 10a, 10b of the electrospinning apparatus, and the spinning liquid main tank 8 Is supplied continuously and quantitatively to a plurality of nozzles 12 of a nozzle block 11 to which a high voltage is applied through a metering pump (not shown). The nylon solution supplied from each of the nozzles 12 is electrospinning on a first bi-component substrate laminated on a first polyethylene terephthalate substrate located on a collector 13 with a high voltage applied thereto through a nozzle 12, The nylon nanofiber nonwoven fabric is laminated on the nylon nanofibers.

On the other hand, the first polyethylene terephthalate base material in which the first two-component base material in which the nylon nanofiber nonwoven fabric is laminated in each of the units 10a, 10b of the electrospinning device 1 is driven by a motor (not shown) Is fed from the first unit 10a to the second unit 10b by the rotation of the feeding roller 3 which is driven by the feeding roller 3 and the auxiliary feeding device 16 driven by the rotation of the feeding roller 3, While the nylon nanofiber nonwoven fabric is continuously electrospun and laminated on the first two-component substrate.

In the present invention, nylon solution in which nylon is dissolved in an organic solvent is used as the spinning solution to be supplied to the spinning solution main tank 8, but it is possible to use a mixture of high melting point nylon and low melting point nylon.

In addition, in the process of electrolessing the nylon solution onto the first two-component substrate to form a laminate, the first unit 10a may have a larger fiber diameter by varying the spinning conditions for each unit 10a, 10b of the electrospinning apparatus It is also possible to laminate a nylon nanofiber nonwoven fabric laminated and continuously laminate a nylon nanofiber nonwoven fabric having a small fiber diameter in the second unit 10b.

In addition, a filter having three or more units of the above-mentioned electrospinning device 1 and having three or more nylon nanofiber nonwoven fabrics having different fiber diameters with different voltages for each unit is laminated on the two-component substrate is manufactured It is also possible to do.

  It is possible to vary the intensity of the voltage applied to each unit 10a and 10b to give a gradient of the fiber diameter and to adjust the distance between the nozzle 12 and the collector 13, Can be formed. In this case, when the type of spinning solution and the voltage intensity to be supplied are the same, the fiber diameter becomes larger as the spinning distance becomes closer, and the nanofiber nonwoven fabric having a different fiber diameter is formed according to the principle that the fiber diameter becomes smaller as the spinning distance becomes longer It is possible. It is also possible to adjust the concentration and viscosity of the spinning liquid or adjust the moving speed of the long sheet to make a difference in fiber diameter.

After the nylon nanofiber nonwoven fabric is laminated in each of the units 10a and 10b in the same manner as described above, the joining device 100 located at the rear end of the electrospinning device 1 is laminated on the second polyethylene terephthalate substrate And then bonded to the first surface of the second two-component substrate so as to face each other. Then, the filter is manufactured through a process of thermal fusion at the laminating apparatus 90.

Example 1

Nylon 6 having a weight average molecular weight (Mw) of 50,000 was dissolved in dimethylacetamide (N, N-dimethylacetamide, DMAc) to prepare a spinning solution and put into the spinning liquid main tank of each unit of each electrospinning device. In each unit, the spinning solution was electrospun on a first ^two -component substrate having a basis weight of 30 g / m ² and laminated on a first polyethylene terephthalate substrate having a basis weight of 150 g / m ² to prepare a nylon 6 nanofiber nonwoven fabric Respectively. The laminating device is located after the electrospinning device end of this basis weight on the nylon 6 nanofiber nonwoven fabric of basis weight laminated on a 150g / m ^2, a second polyethylene terephthalate substrate of 30g / m ^2, a second two-component top surface of the substrate Respectively. Thereafter, in the laminating apparatus, the multilayer nonwoven fabric laminated in the order of the first polyethylene terephthalate base material, the first binary material base, the nylon 6 nanofiber nonwoven fabric, the second binary material base, and the second polyethylene terephthalate material is heat- do. 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

Nylon 6 having a weight average molecular weight (Mw) of 50,000 was dissolved in dimethylacetamide (N, N-dimethylacetamide, DMAc) to prepare a spinning solution and put into the spinning liquid main tank of each unit of each electrospinning device. After the basis weight of the basis weight is laminated to 30g / m ² in the first two-component based on 150g / m ² of a first polyethylene terephthalate substrate, and placed on the collector of the electrospinning apparatus. In the first unit of the electrospinning device, a first nylon 6 nanofibrous nonwoven fabric having a thickness of 3 탆 and a fiber diameter of 250 nm was formed by electrospinning the spinning solution on the first two-component substrate with an applied voltage of 15 kV , And a second nylon 6 nanofibrous nonwoven fabric having a thickness of 3 m and a fiber diameter of 130 nm was formed by electrospinning the spinning solution on the first nylon 6 nanofiber nonwoven fabric by applying an applied voltage of 20 kV to the second unit. After electrospinning devices end in laminating machines the basis weight of 150g / m ² in a second a polyethylene terephthalate, a basis weight in the base material 30g / m ² of a second two-component top surface and said second nylon 6 nanofiber non-woven fabric of the substrate The upper surface was bonded. Thereafter, in the laminating apparatus, the first polyethylene terephthalate base material, the first binary material base, the first nylon 6 nanofiber nonwoven fabric, the second nylon 6 nanofiber nonwoven fabric, the second binary material base, and the second polyethylene terephthalate base material are laminated in this order The nonwoven fabric is thermally fused to finally produce a filter. 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 polyvinylidene fluoride nanofiber nonwoven fabric obtained by electrospinning polyvinylidene fluoride on a polyethylene terephthalate substrate was laminated to form 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 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 (%) 91 90 63

As described above, the filter including the nylon 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 lifetime was measured. The data obtained by 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) 4.2 4.1 5.2 Filter life (month) 6.2 6.3 3.8

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.

Therefore, it can be seen that the filter manufactured through the embodiment of the present invention does not easily separate between the nanofiber nonwoven fabric and the substrate as compared with the comparative example.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or 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 apparatus, 100: laminating apparatus,
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 (12)

A first polyethylene terephthalate substrate;
A first bi-component substrate laminated on the first polyethylene terephthalate substrate;
A first nylon nanofiber nonwoven fabric layer having a fiber diameter of 150 to 300 nm laminated on the first binary material by electrospinning;
A second nylon nanofiber nonwoven fabric layer having a fiber diameter of 100 to 150 nm formed on the first nylon nanofiber nonwoven fabric layer;
A second bi-component substrate laminated on the nylon nanofiber nonwoven fabric; And
And a second polyethylene terephthalate substrate laminated on the second two-component substrate,
Wherein the first and second two-component substrates are C-type, have a basis weight of 10 to 16 g / m ² ,
The basis weight of the first and second polyethylene terephthalate bases is 50 to 300 g / m ² ,
Wherein the first and second polyethylene terephthalate base materials, the first and second binary material base materials, and the first and second nylon fiber nonwoven fabric layers are thermally fused.
delete delete delete delete delete And a joint device for joining other fabrics, wherein a feeding device is independently connected to the nozzles of the nozzle block located in each unit, and a polymer is placed on the substrate positioned in the collector of each unit A method of manufacturing a filter by spinning and by an electrospinning device,
Injecting a spinning solution in which nylon is dissolved in a solvent into a feeding device of each unit of the electrospinning device;
In each of the units, the spinning solution is electrospun on a first two-component substrate laminated on a first polyethylene terephthalate substrate to form a first nylon nanofiber nonwoven fabric layer having a fiber diameter of 150 to 300 nm and a second nylon fiber layer having a fiber diameter of 100 to 150 nm Forming a second nylon nanofiber nonwoven fabric layer;
Bonding the upper surface of the second binary material substrate laminated on the second polyethylene terephthalate substrate onto the nylon nanofiber nonwoven fabric in a lapping device located at the rear end of the electrospinning device; And
Thermally fusing the first and second nylon nanofiber nonwoven fabric layers, the first and second nodular base materials, and the first and second polyethylene terephthalate base materials,
Wherein the first and second two-component substrates are C-type, have a basis weight of 10 to 16 g / m ² ,
Wherein the first and second polyethylene terephthalate base materials have a basis weight of 50 to 300 g / m ² .
delete delete delete delete delete

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