KR101778265B1 - Filter including polyvinyl alcohol nanofiber and hydrophobic polymer nanofiber with low melting polymer adhension layer and its manufacturing method - Google Patents
Filter including polyvinyl alcohol nanofiber and hydrophobic polymer nanofiber with low melting polymer adhension layer and its manufacturing method Download PDFInfo
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- KR101778265B1 KR101778265B1 KR1020150057465A KR20150057465A KR101778265B1 KR 101778265 B1 KR101778265 B1 KR 101778265B1 KR 1020150057465 A KR1020150057465 A KR 1020150057465A KR 20150057465 A KR20150057465 A KR 20150057465A KR 101778265 B1 KR101778265 B1 KR 101778265B1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4282—Addition polymers
- D04H1/43—Acrylonitrile series
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4282—Addition polymers
- D04H1/4318—Fluorine series
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4326—Condensation or reaction polymers
- D04H1/435—Polyesters
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4326—Condensation or reaction polymers
- D04H1/4358—Polyurethanes
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4374—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece using different kinds of webs, e.g. by layering webs
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
- D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
- D04H1/728—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by electro-spinning
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/04—Air intakes for gas-turbine plants or jet-propulsion plants
- F02C7/05—Air intakes for gas-turbine plants or jet-propulsion plants having provisions for obviating the penetration of damaging objects or particles
- F02C7/052—Air intakes for gas-turbine plants or jet-propulsion plants having provisions for obviating the penetration of damaging objects or particles with dust-separation devices
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
- Nonwoven Fabrics (AREA)
Abstract
The present invention relates to a filter including a nanofiber and a method of manufacturing the same. The filter includes a polyvinyl alcohol nanofiber and a hydrophobic polymer nanofiber layer on the substrate, and a low melting point polymer is spun between the substrate, the nanofiber layer and the nanofiber layer, And it is advantageous in that process efficiency and mass production are possible because continuous process is possible, and there is an advantage that desorption is not generated well.
Description
The present invention relates to a filter including a nanofiber and a method of manufacturing the same, and more particularly, to a filter including a polyvinyl alcohol nanofiber and a hydrophobic polymer nanofiber layer on a substrate and a low melting point polymer between the substrate and the nanofiber layer and the nanofiber layer. And an adhesive layer is formed by spinning the nanofiber filter.
Generally, a filter, which is a filtration device for filtering foreign matters in a fluid, is classified into a liquid filter and an air filter. Among them, air filters are used in semiconductor manufacturing, computer equipment assembly, hospitals, food processing plants, agriculture and forestry fisheries, and also widely used in dusty and thermal power plants.
On the other hand, a gas turbine used in a thermal power plant sucks and compresses purified air from the outside, injects compressed air into the combustor together with the fuel, mixes the mixed air and fuel, Which is a type of rotary internal combustion engine that obtains the gas and then injects it into the vane of the turbine to obtain the rotational force. 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 nanofibers are applied to a filter, the specific surface area is larger than that of a conventional filter material having a large diameter, and the flexibility of the surface functional group is also good. In addition, by having the processing size of nano gold, it is possible to efficiently filter fine dust particles.
In addition, in the case of a technique for spinning conventional nanofibers, since it is limited to a small-scale working line focused on a laboratory, there is a demand for a technique of spinning nanofibers by dividing a spinning zone and using a unit concept. Conventional electrospinning devices produce nanofibers by layering a nanofiber web by electrospinning a spinning solution on one side of a substrate supplied from the outside. That is, the conventional electrospinning device is composed of a bottom-up or top-down electrospinning device, and electrospun spinning solution is applied only to the lower surface or the upper surface of the substrate supplied into the electrospinning device to form a nanofiber web.
As described above, since the electrospinning device is composed of the bottom-up electrospinning device or the top-down electrospinning device, the spinning solution is electrospun on the lower surface or the upper surface of the base material supplied from the outside and conveyed in a predetermined direction, The nanofiber or nanofiber filter formed can be produced.
However, when the polymeric spinning solution is electrospun on the substrate through the bottom-up electrospinning device or the top-down electrospinning device to form a laminate of nanofiber webs, the nanofiber web may be removed from the substrate during transfer of the substrate, There is a problem that the nanofiber web is dislodged from the substrate of a product made of a fiber filter.
That is, when the nanofiber web is laminated by electrospinning the polymer spinning solution on the base material through the electrospinning device, the product made of the nanofiber or the nanofiber filter is used as the material of the base and the polymer spinning solution The nanofiber web on which the polymer spinning solution is electrospun and laminated is desorbed from the substrate due to the difference in the composition.
Meanwhile, a laminating process for laminating the base material and the nanofiber web to be pressed in the nanofiber or nanofiber filter manufactured through the electrospinning device is provided as a post-process. However, since the material and the composition of the base and the polymer solution are different The nanofiber web on which the polymer spinning solution is electrospun and laminated is desorbed from the substrate.
In order to solve the problems described above, the polymer spinning solution and the hot melt are mixed and supplied to the nozzle block of the electrospinning device when the polymer spinning solution is supplied, so that the polymer spinning solution is injected simultaneously with the polymer spinning solution during the electrospinning of the polymer spinning solution It has been proposed to prevent desorption of a nanofiber web on which a substrate and a polymer spinning solution are electrospun by a hot melt. However, in the case of mixing a polymer spinning solution and a hot melt, a polymer spinning solution There is a problem that the hot melt is radiated to the portion and the portion where the hot melt is not required, thereby deteriorating the performance and quality of the nanofiber or nanofiber filter.
Further, the use amount of the hot melt is increased by mixing hot melt in the polymer spinning solution, and the performance and quality of the nanofiber web, which is laminated by electrospinning of the polymer spinning solution on the substrate upon mixing and adding an excessive amount of hot melt to the polymer spinning solution And the like.
Disclosure of the Invention The present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to provide a method for manufacturing a nanofiber layer, which comprises a polyvinyl alcohol nanofiber and a hydrophobic polymer nanofiber layer on a substrate, An adhesive layer is formed on the surface of the nanofiber filter, and a method of manufacturing the nanofiber filter.
Polyvinyl alcohols (PVA) used in the present invention exhibit superior strength and elastic modulus to polyamide, polyester and polyacrylonitrile fibers, and are particularly excellent in adhesiveness, water dispersibility, alkali resistance and chemical resistance Filters and other industrial materials.
In order to achieve the above object, A first nanofiber layer formed by electrospinning a polyvinyl alcohol solution; A second nanofiber layer laminated on the first nanofiber layer by electrospinning a hydrophobic polymer solution selected from polyvinylidene fluoride, low melting point polyester and hydrophobic polyurethane; Wherein the adhesion between the base material and the first nanofiber layer and between the first nanofiber layer and the second nanofiber layer is adhered through an adhesive layer formed by electrospinning the low melting point polymer solution. .
The low-melting-point polymer solution is characterized in that it is selected from at least one of a low melting point polyester, a low melting point polyurethane, and a low melting point polyvinylidene fluoride.
In order to solve the above problems more effectively,
The low melting point polymer solution may be electrospun on the entire surface or a part of the substrate and the first nanofiber layer, and may be electrospun at a temperature of 50 to 100 ° C.
In addition, in the present invention, when the first nanofiber layer and the second nanofiber layer are electrospun, the basis weight may be different along the longitudinal direction or the transverse direction, and the electrospinning of the low melting point polymer solution for forming the adhesive layer may be performed by, It can be radiated to the whole or a part of the nanofiber layer.
The nanofiber filter manufactured by the present invention is easier to adhere between the base layer and the polymer electrospinning layer than the conventional filter and is not easily separated, and is sprayed only on specific regions and portions on the substrate, And at the same time minimize the interference of the low melting point polymer with respect to the nanofiber web, thereby improving the performance and quality of the nanofiber or nanofiber filter.
Also, the filter manufactured by the method can reduce the pressure loss, increase the filtration efficiency, and extend the life of the filter.
1 is a side view schematically showing an electrospinning apparatus according to the present invention;
Fig. 2 is a side sectional view schematically showing a nozzle of a nozzle block installed in a unit of the electrospinning apparatus according to the present invention. Fig.
3 is a view schematically showing a nozzle block installed in a spinning solution unit of an electrospinning apparatus according to the present invention
Fig. 4 is a perspective view schematically showing a state in which an electric heater is installed in a nozzle block installed in each unit of the electrospinning apparatus according to the present invention. Fig.
5 is a cross-sectional view taken along line A-A '
6 is a perspective view schematically showing a nozzle block installed in a low melting point polymer unit of an electrospinning apparatus according to the present invention.
FIGS. 7 to 10 are plan views schematically showing the operation process of the polymer spinning solution being electrospinned on the same plane of the base material through the nozzles of the respective nozzle tubes of the electrospinning device for manufacturing a nanofiber web according to the present invention
FIGS. 11 and 12 are plan views schematically showing an operation process in which the low melting point polymer and the polymer spinning solution are sequentially injected through the arrangement of the nozzle blocks in the low melting point polymer unit as shown in FIG.
13 is a view showing a state in which the nozzle blocks provided in the low melting point polymer unit of the electrospinning apparatus according to the present invention are arranged in different shapes
14 and 15 are diagrams showing an operation process of sequentially injecting the low-melting-point polymer and the polymer spinning solution according to the arrangement of the nozzles as shown in FIG. 13
16 is a view showing a state in which the nozzle blocks provided in the low melting point polymer unit of the electrospinning apparatus according to the present invention are arranged in another form
FIGS. 17 and 18 are diagrams showing an operation process in which the low-melting-point polymer and the polymer spinning solution are sequentially injected according to the arrangement of the same nozzle as shown in FIG.
19 is a front view showing a laminated structure of the nanofiber filter manufactured by 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.
1 is a side view schematically showing an electrospinning apparatus according to the present invention. The electrospinning apparatus 1 according to the present invention comprises a bottom-up electrospinning apparatus 1, wherein at least one low-melting polymer unit 10a, 10c and a spinning liquid unit 10b, Melting polymeric units 10a and 10c and the spinning solution units 10b and 10d are separately provided with the same or different low melting point polymers or polymeric spinning liquids, To produce a nanofilter.
In one embodiment of the present invention, the electrospinning device 1 is a bottom-up electrospinning device, but it may also be a top-down electrospinning device (not shown).
The low-melting-point polymer unit and spinning solution unit may include a main tank 8 in which a low-melting-point polymer or a polymer solution is filled, and a low-melting-point polymer or polymer solution filled in the main tank 8 in a predetermined amount
The electrospinning device 1 according to the present invention has a structure in which a low melting point polymer or a polymer spinning liquid filled in the main tank 8 is supplied to a plurality of nozzles (not shown) formed in the
Here, a feed roller (not shown) for feeding a
On the other hand, the
The spinning solution supplied through the
N, N-dimethylacetamide is preferably used.
2, the
The
An air supply nozzle 404 surrounding the multi-tubular nozzle 500 and the overflow removing nozzles 415 and an air supply nozzle 404 located at the uppermost end of the
Further, an
In the embodiment of the electrospinning device 1 according to the present invention, the
Here, the tip portion 503 formed in the tubular shape is formed to be narrowed from the upper portion to the lower portion. However, the tip portion 503 may be formed in various other shapes as long as it is narrowed from the upper portion to the lower portion.
On the other hand, the electrospinning device 1 according to the present invention is provided with an
According to the structure as described above, the main tank 8 stores a spinning solution to be a raw material of the nanofibers. The spinning liquid main tank 8 is provided therein with an agitating
The
The second
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
The
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
The
The
On the other hand, the spinning liquid overflowed in the
The
At this time, it is preferable that at least one of the
When the number of the
Meanwhile, the
Here, the
The vaporized VOC generated in the low melting point polymer unit 10a and the spinning solution unit 10b is introduced into the
That is, piping 311 and 331 for interconnecting the low melting point polymer unit, the spinning solution unit and the condensing
In an embodiment of the present invention, the VOC is condensed through the
Here, the
In this case, the
Here, the
That is, the low melting point polymer unit, the spinning liquid unit (and the
Then, the content of the solvent in the spinning liquid overflowed and recovered in the
Based on the measurement results, the required amount of the solvent is supplied to the
It is preferable that the
It is also possible to eliminate the insulating
As described above, the
It is also possible to optimize the insulation between the
In addition, the leakage current can be stopped within a predetermined range, the current supplied from the voltage generator can be monitored, the abnormality of the electrospinning device 1 can be detected early, Continuous operation is possible, the production of nanofibers with required performance is stable, and mass production of nanofibers is possible.
Here, the thickness a of the
Therefore, when 40 kV is applied between the
The distance between the inner surface of the
On the other hand, the
4, the
Here, the flow of the polymer solution in the
The polymer spinning solution supplied to each
A plurality of
In order to control the temperature control of the polymer spinning solution supplied to and introduced into the
In order to adjust the temperature of the plurality of
As described above, the present invention uses a polymer solution for electrospinning. Generally, the existing inventions have a diluting agent and concentration adjusting devices to keep the concentration of the polymer solution constant.
These diluents include MEK (methyl ether ketone), THF (tetra hydro furan), Alcohol
Etc. are used. The concentration of the polymer solution recovered through the
However, in the present invention, instead of maintaining the concentration constant, the polymer solution of high concentration to be reused is reused after overflow, and the viscosity of the polymer solution is adjusted by using the
In the present invention, the temperature control of the polymer solution is performed in such a manner that the
In the embodiment of the present invention, a
Through the
20, an auxiliary transfer device 16 (FIG. 20) for controlling the transfer speed of the
The auxiliary conveying device 16 is configured to convey the
The auxiliary belt 16a is rotated by the rotation of the
In the embodiment of the present invention, five
Meanwhile, in the embodiment of the present invention, the auxiliary transfer device 16 is composed of the
At this time, the
The auxiliary conveying device 16 is composed of the auxiliary belt 16a and the
In addition, in the embodiment of the present invention, the
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 of the electrospinning device 1, and the thickness of the sheet is measured according to the thickness measured by the thickness measuring device 70 V) and the
When the thickness of the nanofiber nonwoven fabric discharged from a unit located at the distal end portion of the electrospinning device 1 is measured to be thinner than the deviation amount by the above-described structure, the conveyance speed V of the next unit is delayed, The discharge amount of the nanofiber nonwoven fabric per unit area can be increased and the thickness can be increased by increasing the discharge amount of the
When the thickness of the nanofiber nonwoven fabric discharged from the low melting point polymer unit located at the front end of the electrospinning device 1 is measured to be thicker than the deviation amount, the feeding speed V of the spinning liquid unit is increased, 11 can be reduced and the intensity of the voltage generator voltage can be controlled to reduce the amount of the nanofiber nonwoven fabric discharged per unit area to reduce the amount of lamination to thereby reduce the thickness of the nanofiber nonwoven fabric, A nonwoven fabric can be produced.
Here, the thickness measuring device 9 is disposed so as to face upward and downward with the
Thus, the thickness of the
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
Meanwhile, the thickness of the nanofiber nonwoven fabric of the
The elongated sheet conveying speed regulator 30 includes a buffer zone 31 formed between the low melting point polymer unit 10a and the spinning solution unit 10b of the electrospinning apparatus 1 and a buffer zone 31 A pair of support rollers 33 and 33 'provided on the pair of support rollers 33 and 33' for supporting the
At this time, the support rollers 33 and 33 'are provided in the lower melting-point polymer unit and the spinning solution unit, and the support rollers 33 and 33' For supporting the conveyance of the
The adjustment roller 35 is provided between the pair of support rollers 33 and 33 'so that the
In order to achieve this, a sensing sensor (not shown) for sensing the conveying speed of the long sheet in each unit is provided, and the movement of the adjusting roller 35 according to the conveying speed of the long sheet in each unit sensed by the sensing sensor And a main control unit 7 for controlling the main control unit.
In an embodiment of the present invention, the conveying speed of the long sheet is sensed in the low-melting polymer unit and the spinning liquid unit, and the control unit controls the movement of the regulating roller 35 according to the detected conveying speed of the long sheet The control unit detects the driving speed of the auxiliary belt provided on the outside of the
When the detection sensor detects that the conveying speed of the long sheet in the low melting point polymer unit located at the tip of each unit is faster than the conveying speed of the long sheet in the spinning liquid unit positioned at the succeeding stage, 22, and 23, in order to prevent the elongated sheet fed in the low melting point polymer unit from sagging, the
On the other hand, when the detection sensor detects that the conveying speed of the long sheet in the low melting point polymer unit is slower than the conveying speed of the long sheet in the spinning liquid unit, as shown in FIGS. 24 to 25, The upper roller 35 is disposed between the pair of the support rollers 33 and 33 'so as to prevent the long sheet from being torn, and the adjustment roller 35, on which the
By controlling the conveying speed of the long sheet conveyed into the spinning solution unit by the above-described structure, the conveying speed of the long sheet in the spinning solution unit becomes equal to the conveying speed of the long sheet in the low melting point polymer unit.
On the other hand, the electrospinning device 1 according to the present invention is provided with the air permeability measuring device 80. That is, an air permeability measuring device 80 for measuring the air permeability of the nanofiber nonwoven fabric manufactured through the electrospinning device 1 is provided behind the unit located at the rear end of each unit of the electrospinning device 1.
As described above, the feeding speed of the
When the air permeability of the nanofiber nonwoven fabric discharged through each unit of the electrospinning device 1 is measured largely, the feeding speed V of the spinning liquid unit is decreased or the ejection amount of the
When the air permeability of the nanofiber nonwoven fabric discharged through each unit of the electrospinning device 1 is measured to be small, the feeding speed V of the spinning liquid unit is increased or the discharging amount of the
As described above, it is possible to manufacture a nanofiber nonwoven fabric having uniform air permeability by controlling the feeding speed of each unit and the
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
The main control unit 7 includes a
4 is a plan view schematically showing a nozzle block installed in a spinning liquid unit of an electrospinning apparatus according to the present invention. As shown in the drawing, the
5 is a perspective view schematically showing a nozzle block installed in a low melting point polymer unit of an electrospinning apparatus according to the present invention. The nozzle arranged in the low melting point polymer unit may be applied to the front face portion of the substrate, but is preferably applied to a specific portion of the substrate if necessary. In Fig. 5, the nozzles are divided into five groups of nine nozzles, one at the center and two at the bottom in the upper part. However, the arrangement of the nozzle and the nozzle block is not limited thereto, and it is obvious that those skilled in the art can appropriately design, change and arrange the nozzle in consideration of the number of the nozzles and the amount of the low melting point polymer to be radiated.
FIGS. 6 to 9 are plan views schematically illustrating the operation of electrospinning a polymer spinning solution on the same plane of a substrate through nozzles of each nozzle tube of an electrospinning apparatus for manufacturing a nanofiber web according to the present invention. The
The
At this time, the supply piping 240, which is communicated to the
The
That is, when the polymer spinning solution is supplied to the
The spray liquid main tank 8 and the
That is, the
The means for regulating the amount of radiation comprises
By providing the
In the present invention, if the amount of radiation of the polymer spinning solution which is supplied after being supplied to the
In the present invention, valves 212, 213, 214 and 233 are provided in the supply pipe 240 so that the nozzle tubes 112a, 112b, 112c, 112d, and 112d of the nozzle block 111 in the spinning liquid main tank 8, 112, 112f, 112g, 112h, 112i, and the valves 212, 213, 214, 233 are provided in the supply pipe 240 to control the flow rate of the polymer tubing liquid supplied to the nozzle tubes 112a, 112b, 112c, 112c, 112c, 112d, 112c, 112d, 112e, 112f, 112g, 112h, 112i and regulating and controlling the radiation amount of the polymer spinning solution which is electrospun through each nozzle 111a, The nanofiber webs having different weights in the length and width direction of the base material 115 are formed by the polymer spinning solution which is electrospun in the respective nozzles 111a of the base materials 111a to 112d, 112e, 112f, 112g, 112h and 112i, After the nozzles 111a are arranged in the nozzle block 111, the nozzles 111a are directly controlled and controlled individually But it is also possible to form the nanofiber webs having different weights in the length and width direction of the base material 115 by controlling and controlling the spinning amount of the polymer spinning solution which is electrospun through the respective nozzles 111a, .
The MD direction used in the present invention means a machine direction, and means a longitudinal direction corresponding to the progress direction in the case of continuous production of fibers such as a film or a nonwoven fabric, and the CD direction means a perpendicular direction to the CD direction as a cross direction . MD is the machine direction / longitudinal direction, and CD is the width direction / transverse direction.
Basis Weight or Grammage is defined as the mass per unit area, that is, the preferred unit, grams per square meter (g / m 2). In recent years, for the purpose of making the air filter and the unit lighter and more compact, a type of the filter having a smaller depth is required, and if the filter material having the same filtration area is put in the unit, the filter material faces contact each other due to the thickness of the filter material, There has been a problem in that the pressure loss of the air filter unit remarkably increases. To solve this problem, there has been an attempt to reduce the thickness of the filter material for the air filter, that is, to reduce the basis weight. However, such an attempt has been made to reduce the basis weight of the filter, and it is possible to solve the pressure loss of the air filter unit sufficiently when the basis weight is reduced for a specific portion of the filter for each specific industrial field to which the filter is applied. The strength of the filter medium can be maintained.
FIG. 10 and FIG. 11 are plan views schematically showing an operation process of sequentially injecting the low melting point polymer and the polymer spinning solution through the arrangement of the nozzle blocks in the low melting point polymer unit as shown in FIG. 5, wherein the arrangement of the nozzle blocks as shown in FIG. The low melting point polymer is applied to a portion of the substrate (one at the center and two at the top and two at the top) and then the polymer spinning solution is radiated to the front side of the substrate.
12 and 15 show a state in which the nozzle block provided in the low melting point polymer unit of the electrospinning apparatus according to the present invention is arranged in another form. Fig. 12 is arranged to face the longitudinal direction of the substrate, and Fig. 15 shows the shape arranged to face the width direction of the substrate. The operation sequence of sequentially injecting the low-melting-point polymer and polymer solution according to the discharge vessel of the nozzle as shown in FIGS. 12 and 15 is shown in FIGS. 13 and 14 and FIGS. 16 and 17, respectively.
The nanofiber layer of the present invention uses a polyvinyl alcohol solution.
The cellulose base material used in the present invention is preferably composed of 100% cellulose, but cellulose having a total mass ratio of 70 to 90: 10 to 30 mass% of polyethylene terephthalate (PET) It is also possible to use a substrate having a cellulose base coated with a flame retardant coating.
The binary substrate may be selected from a sheath-core type, a side by side type, and a C-type type.
The low-melting-point polyurethane uses a low-polymerization polyurethane having a softening temperature of 80-100 ° C.
The low melting point polyester is preferably terephthalic acid, isophthalic acid or a mixture thereof. It is also possible to add ethylene glycol as a diol component to further lower the melting point.
The low melting point polyvinylidene fluoride is a low melting point polyvinylidene fluoride having a weight average molecular weight of 5,000 and a melting point of 80 to 160 ° C.
It is needless to say that the low melting point polyurethane, the low melting point polyester and the low melting point polyvinylidene fluoride may be used singly or in combination of two or more.
Hereinafter, a method of manufacturing the nanofiber filter of the present invention will be described using the electrospinning device.
(N, N-dimethylaceticamide) solvent to prepare a low-melting-point polymer solution, and the low melting point polyvinylidene fluoride, low melting point polyester, low melting point polyurethane, Is supplied to the main tank 8 connected to the polymer units 10a and 10c and the low melting point polymer solution supplied to the main tank 8 is supplied to the
Next, a polymer spinning solution in which polyvinyl alcohol is dissolved in a solvent is supplied to the main tank 8 connected to the spinning solution unit 10b of the electrospinning apparatus, and the polymer spinning solution in which the hydrophobic polymer is dissolved in the solvent is introduced into the spinning solution unit 10d To the main tank (8) connected to the main tank (8). The polyvinyl alcohol solution supplied to the main tank 8 connected to the spinning liquid unit 10b is electrospun through a
Then, another low melting point polymer solution is discharged from the low melting point polymer unit 10c through the nozzle to form another adhesive layer on the first nanofiber layer, and the solution is supplied to the main tank 8 connected to the spinning solution unit 10d The hydrophobic polymer solution is electrospun through the
On the other hand, the substrate is rotated by a feed roller 3 driven by a motor (not shown) and an auxiliary feed device 16 driven by the rotation of the feed roller 3, Unit and the first and second nanofiber layers are electrospun on the substrate while repeating the above-described processes.
Example 1
Melting polymeric unit 10a or 10c of the electrospinning apparatus was prepared by dissolving a low-polymerization polyurethane having a softening temperature of 80-100 ° C in a solvent of DMAc (N, N-dimethylaceticamide) In the main tank. Polyvinyl alcohol and polyvinylidene fluoride having a weight average molecular weight of 50,000 were dissolved in dimethylacetamide (N, N-dimethylacetamide, DMAc) to prepare each spinning solution. This solution was added to spinning solution units 10b and 10d Were put into the connected main tanks.
A distance between the electrode and the collector was 40 cm, an applied voltage of 25 kV, and an applied voltage of 70 캜 to form an adhesive layer having a basis weight of 0.1 g / m 2 on the cellulose substrate in the low melting point polymer unit 10 a, And the collector was electrospun at a distance of 40 cm and an applied voltage of 20 kV and 70 ° C to form a first nanofiber layer (polyether sulfone) having a basis weight of 0.5 g / m 2 . Another adhesive layer was formed on the first nanofiber layer under the same electrospinning condition through the low melting point polymer unit 10c. The distance between the electrode and the collector from the spinning solution unit 10d was set to 40 cm, the applied voltage was 20 kV, 70 electrospinning the basis weight of 0.5g / m 2 of nano-fiber layer from the second ℃ (polyvinylidene fluoride) were laminated.
Example 2
Except that polyvinyl alcohol and a low melting point polyester were dissolved in dimethylacetamide (N, N-dimethylacetamide, DMAc) to prepare each spinning solution and put into a main tank connected to spinning solution units 10b and 10d Was carried out in the same manner as in Example 1.
Example 3
Except that polyvinyl alcohol and hydrophobic polyurethane were dissolved in dimethylacetamide (N, N-dimethylacetamide, DMAc) to prepare each spinning solution, and the solution was added to the main tank connected to spinning solution units 10b and 10d Was carried out in the same manner as in Example 1.
Comparative Example 1
The cellulose substrate used in Example 1 was used as a filter media.
Comparative Example 2
A polyamide nanofiber nonwoven fabric was laminated by electrospinning a polyamide on a cellulose substrate 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 5 and Comparative Example 1 were measured by the above-mentioned methods and are shown in Table 1.
Filtration efficiency (%)
As described above, the filter manufactured through the embodiment of the present invention is superior in filtration efficiency as compared with 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.
(month)
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 compared to 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 to 3, The filter had a tendency to desorb the nanofiber nonwoven fabric.
Therefore, as in the present invention, a nanofiber filter in which an adhesive layer is formed by electrospinning a nanofiber layer in which a solution of polyethersulfone and a hydrophobic polymer is electrospun on a substrate is subjected to desorption ) Is not likely to occur.
- Viscosity adjustment result by temperature control device
[Example 6]
20% by weight of polyethersulfone was dissolved in 80% by weight of a solvent of NN-dimethylacetamide (DMAc) to prepare a spinning solution having a concentration of 10% and a viscosity of 1000 cps, and the spinning solution was provided in the main tank 8. Thereafter, the spinning solution was moved from the main tank 8 to the nozzle block, and then the distance between the nozzle block and the collector was 40 cm and the applied voltage was 25 kV. In the course of preparing the main storage tank, which is one of the storage tanks, the concentration of the spinning solution in the main tank was changed to 15%, and the viscosity was changed to 2000 cps. Thereafter, the temperature of the main tank was raised to 70 ° C to lower the viscosity to 1000 cps by the sensor of the temperature controller, and electrospun was obtained to obtain nanofibers.
[Example 7]
As the concentration of the spinning solution in the main tank 8 was changed to 20% by the overflowed solid content and the viscosity was increased, the temperature of the main tank 8 was adjusted to 65 ° C Was electrospinning in the same manner as in Example 6
[Example 8]
As the concentration of the spinning solution in the main tank 8 was changed to 25% by the overflowed solids, the temperature of the main storage tank was raised to 80 DEG C by a temperature controller to maintain the viscosity at 1000 cps as the viscosity increased. The electrospinning was carried out in the same manner as in Example 6.
[Example 9]
As the concentration of the spinning solution in the main tank 8 was changed to 30% by the overflowed solids, the temperature of the main storage tank was raised to 95 ° C by a temperature controller to maintain the viscosity at 1000 cps as the viscosity increased. The electrospinning was carried out in the same manner as in Example 6.
[Comparative Example 3]
20% by weight of polyethersulfone was dissolved in 80% by weight of NN-dimethylacetamide (DMAc) as a solvent to prepare a spinning solution having a concentration of 10% and a viscosity of 1000 cps. Then, the spinning solution was moved from the main storage tank to the nozzle block, and then the distance between the nozzle block and the collector was 40 cm and the applied voltage was 25 kV. In the course of the subsequent spinning process, the overflowed solidified material was returned to the main storage tank, and the concentration of the spinning solution in the main storage tank was changed to 20%. To maintain the concentration again at 10%, DMAc was added And THF, which is a diluent, was added thereto to conduct electrospinning.
The viscosity of the nanofibers produced according to Examples 6 to 9 and Comparative Example 3 and the nanofiber yield
The spinning speed was measured at 0.2 g / m 2, and the results are shown in Table 3.
(1,000 cps)
(1,000 cps)
(1,000 cps)
(1,000 cps)
(1,000 cps)
(m / min)
According to Table 3, as the concentration of the embodiment is higher and the viscosity is constant as compared with the comparative example, as the amount of the solid material to be laminated on the actual collector increases during spinning, the winding speed becomes faster and the production amount increases. Thus, it is expected that the embodiment will be able to obtain more efficient spinning and increased throughput than the comparative example.
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: main tank, 10a: low melting point polymer unit
10b: spinning liquid 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 body, 41, 42: heat wire,
43: pipe, 60: thermostat,
70: thickness measuring device, 80: air permeability measuring device,
90: laminating device, 111: nozzle block,
111a: nozzle 112: nozzle tube,
112a, 112b, 112c, 112d, 112e, 112f, 112g, 112h, 112i:
115: substrate, 115a, 115b, 115c: nanofiber web,
200: overflow device,
211, 231: stirring device, 212, 213, 214, 233: valve,
216: second transfer pipe, 218: second transfer control device,
220: intermediate tank, 222: second sensor,
230: regeneration tank, 232: first sensor,
240: supply piping, 242: supply control valve,
250: circulating fluid recovery path, 251: first transfer pipe,
300: VOC recycling apparatus, 310: condensing apparatus,
311, 321, 331, 332: piping, 320: distillation device,
330: solvent storage device, 404: air supply nozzle,
405: nozzle plate, 407: first spinning solution storage plate,
408: second spinning liquid storage plate, 410: overflow liquid temporary storage plate,
411: air storage plate, 412: overflow outlet,
413: air inlet,
414: nozzle support plate for supplying air, 415: overflow removing nozzle,
416: nozzle support plate for removing overflow, 500: multi-tubular nozzle,
501: inner tube, 502: outer tube,
503: the tip.
Claims (6)
A first nanofiber layer formed by electrospinning a polyvinyl alcohol solution;
A second nanofiber layer laminated on the first nanofiber layer by electrospinning a hydrophobic polymer solution selected from polyvinylidene fluoride, low melting point polyester and hydrophobic polyurethane; Including,
The adhesion between the base material and the first nanofiber layer, between the first nanofiber layer and the second nanofiber layer is carried out through an adhesive layer formed by electrospinning the low melting point polymer solution,
Wherein the first nanofiber layer and the second nanofiber layer have different weights in the longitudinal direction or in the transverse direction.
Wherein the low-melting-point polymer solution is selected from at least one selected from a low-melting-point polyester, a low-melting-point polyurethane, and a low-melting polyvinylidene fluoride.
Wherein the low-melting-point polymer solution is electrospun on the entire surface or a part of the substrate and the first nanofiber layer.
The first and second nanofiber layers are formed by electrospinning a hydrophobic polymer solution selected from polyvinyl alcohol and polyvinylidene fluoride, low melting point polyester and hydrophobic polyurethane at a temperature of 50 to 100 ° C As one nanofiber filter.
Wherein the polymer solution for forming the first and second nanofiber layers is maintained at a viscosity of 1,000 cps to 3,000 cps through a temperature controller.
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PCT/KR2015/007142 WO2016171328A1 (en) | 2015-04-23 | 2015-07-09 | Filter including nanofiber |
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JP2012516399A (en) | 2009-01-28 | 2012-07-19 | ドナルドソン カンパニー,インコーポレイティド | Fiber medium and method and apparatus for forming the same |
KR101292657B1 (en) * | 2013-02-06 | 2013-08-23 | 톱텍에이치앤에스 주식회사 | A hybrid non-woven separator having the inverted structure |
KR101479755B1 (en) | 2013-08-01 | 2015-01-07 | (주)에프티이앤이 | Multi-layered nanofiber filter with excellent heat-resisting property and its method |
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JP2012516399A (en) | 2009-01-28 | 2012-07-19 | ドナルドソン カンパニー,インコーポレイティド | Fiber medium and method and apparatus for forming the same |
KR101292657B1 (en) * | 2013-02-06 | 2013-08-23 | 톱텍에이치앤에스 주식회사 | A hybrid non-woven separator having the inverted structure |
KR101479755B1 (en) | 2013-08-01 | 2015-01-07 | (주)에프티이앤이 | Multi-layered nanofiber filter with excellent heat-resisting property and its method |
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