KR20160050377A - Water-proof and moisture-permeable fabric and method of manufacturing the same - Google Patents

Abstract

The present invention relates to a manufacturing method of nanofiber and, more particularly, to a manufacturing method of waterproof and moisture-permeable fabric using bottom-up electrospinning method. The manufacturing method manufactures waterproof and moisture-permeable fabric using a bottom-up electrospinning device including a plurality of nozzle pipes inside of a bottom-up electrospinning device unit, and the fabric has different kinds of polymers in the nanofiber in CD direction. By designing a nozzle block to be two parts, three parts, or six parts in CD direction, the manufacturing method can adjust kinds of polymer solutions to be different. The present invention also relates to waterproof and moisture-permeable fabric having different kinds of polymer in CD direction.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-proof and water-proof fabric,

The present invention relates to a method for manufacturing a moisture-permeable and waterproof fabric having different polymer types in a planar direction, and more particularly, to a method for manufacturing a moisture-permeable and waterproof fabric having different types of polymer in the CD direction and a moisture- .

Generally, a breathable waterproof fabric is a fabric that has the property of passing water vapor water and not transmitting liquid water. These breathable waterproof fabrics are mainly used in outdoor clothing such as mountain climbing wear and ski wear. The clothing using the breathable waterproof fabric discharges water vapor sweat generated by the physical activity to the outside, and water droplet type water such as rainwater does not penetrate into the clothes.

This characteristic of the breathable waterproof fabric can be explained by the following principle. Water forms water vapor through intermolecular hydrogen bonds in the gaseous state, and the diameter of the water vapor is generally from a few tens to a few hundred nanometers. On the other hand, liquid water exists in the form of water droplets with diameters of hundreds of microns because hydrogen molecules are bonded to hydrogen molecules in a larger amount than the gaseous state. Therefore, the layer formed on the surface of the fabric has a moisture-permeable and waterproof property if it has pores enough to allow water vapor to pass therethrough and water droplets. In the past, there was a nano-web membrane film or a functional film as a layer having such moisture-permeable and water-proof properties, and a moisture-permeable and waterproof fabric was prepared by laminating the fabric using a glue or the like.

The moisture permeable waterproof layer is made of a nanofiber and has a weak bonding force. Therefore, a large amount of adhesive has been used since the moisture permeable and waterproof layer is poor in adhesion to the fabric. However, when such adhesives are used in a large amount, there is a problem that water vapor molecules in the form of water can not pass therethrough, and the moisture permeability of the fabric is deteriorated. Also, the breathable waterproof layer was not good in abrasion resistance due to the characteristics of nanofiber, and the price competitiveness was not good when using electrospinning.

On the other hand, in the case of manufacturing clothes, the breathable and waterproof function does not need to be applied to the entire clothing in industry, and the breathing and waterproof function needs to be concentrated on specific areas where sweat is high due to the use of clothing and the nature of human activities.

In addition, the nano-web membrane film, which constitutes the conventional moisture-permeable waterproof layer, is made with microporous layer by using laminating and manpower or tensile force after manufacture, thereby providing moisture-proof and waterproof function. Therefore, there was a limitation that the entire breathable and waterproof fabric could be made only of the fabric including the breathable waterproof layer, and the problems mentioned above could not be solved. In addition, there has been a limit in that the garment industry has to work with a single fabric due to the nature of the waterproofing of the sewing line when the garment having the property of Gore-Tex is sewn by using the breathable waterproof fabric or the like.

Accordingly, the present invention relates to a moisture-permeable and waterproof fabric including a polymer solution of a moisture-permeable and waterproof fabric by partially regulating the polymer type of the moisture-permeable and waterproof fabric by using bottom-up electrospinning using an independent tank connected with a nozzle block, .

Korean Patent No. 10-0944767 Korean Patent No. 10-1068048

The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a moisture permeable nano fiber layer in which the moisture permeability Moisture-permeable nanofiber layer, a moisture-permeable and waterproof fabric, and a method of manufacturing the same.

A method for manufacturing a moisture-permeable and waterproof fabric using bottom-up electrospinning, the method comprising the steps of: forming a bottom-up electrospinning unit having a plurality of nozzle tubes, Of the present invention.

The fiber diameter of the nanofibers is controlled by adjusting the concentration of the polymer solution injected into the plurality of nozzle tubes to control the diameter of the nanofibers. And a manufacturing method thereof.

Also, when the one direction polymer in the CD direction is polyurethane and the other one direction is nylon, or when the moisture permeable and waterproof fabric is divided into three in CD direction, the middle part is polyurethane and the rest part is nylon. to provide.

In addition, the present invention provides a moisture-permeable and waterproof fabric produced by the above manufacturing method.

The present invention provides a breathable and waterproof nanofiber layer, a moisture-permeable and waterproof fabric, and a method for manufacturing the same, which can improve moisture permeability and waterproof efficiency, improve durability and productivity of nanofiber production by providing a breathable and waterproof fabric having different kinds of polymers in the CD direction .

1 is a side view schematically showing an electrospinning device for manufacturing a nanofiber web,
2 is a plan view schematically showing a nozzle body arranged in a nozzle block of an electrospinning apparatus for manufacturing a nanofiber web according to the present invention,
3 is a perspective view schematically showing a nozzle body arranged in a nozzle block of an electrospinning device for manufacturing a nanofiber web according to the present invention,
FIGS. 4 to 5 are plan views schematically showing an operation process of electrospinning a different kind of polymer spinning solution on the same plane through each nozzle tube of an electrospinning device for manufacturing a nanofiber web according to the present invention. FIG.
6 to 8 are plan views of a moisture-permeable, waterproof nanofiber web having different types of polymers in the CD direction according to the present invention.

An electrospinning device for manufacturing and producing nanofibers includes a spinning liquid main tank filled with spinning solution, a metering pump for supplying a fixed amount of spinning solution, a nozzle block having a plurality of nozzles for discharging spinning solution, And a voltage generating device for generating a voltage and a collector for accumulating the fibers that are positioned at the lower end of the nozzle and emit radiation.

The electrospinning device having the above-described structure includes a spinning liquid main tank filled with a spinning solution, a metering pump for supplying a fixed amount of the polymer spinning solution filled in the spinning solution main tank, and a polymer spinning solution in the spinning solution main tank A nozzle block having a plurality of nozzles arranged in a pin shape and arranged to discharge the polymer solution, and a collector disposed at an upper end of the nozzle and spaced apart from the nozzle by a predetermined distance in order to accumulate the polymer solution, And a unit including the apparatus.

A method of manufacturing nanofibers through such an electrospinning device is a method in which a spinning liquid in a spinning liquid main tank filled with a spinning liquid is continuously and constantly supplied in a large number of nozzles to which a high voltage is applied through a metering pump, A nanofiber web is formed on a long sheet conveyed to the units of the electrospinning device, and the nanofibers are formed in a laminated structure The long sheets are passed through the respective units and laminated with the nanofibers repeatedly, followed by laminating, embossing, heat-pressing, and needle punching.

Here, the electrospinning device is divided into a bottom-up electrospinning device, a top-down electrospinning device, and a horizontal electrospinning device depending on the direction on the collector. That is, the electrospinning device has a configuration in which the collector is located at the upper end of the nozzle, and a bottom-up electrospinning device capable of producing uniform and relatively fine nanofibers, a collector is disposed at the lower end of the nozzle, A top-down electrospinning device capable of increasing the production amount of nanofibers per unit time, and a horizontal electrospinning device having a collector and nozzles arranged in a horizontal direction.

The bottom-up electrospinning device has a configuration in which a spinning solution is injected through nozzles of an upward nozzle block, and a spinning solution to be injected is deposited on a lower surface of the support to form nanofibers.

With the above-described configuration, the elongated sheet on which the nanofiber web is laminated by spraying the spinning liquid through the nozzles in one of the units of the bottom-up electrospinning device is transferred to the inside of the other unit, A nanofiber web is produced by repeatedly performing the above-mentioned processes such as spraying a spinning solution through a nozzle onto a long sheet to form a laminate of nanofibers.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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.

The nanofiber generally means a fiber having an average diameter of 50 to 1000 nm or less and can be manufactured using an electrospinning device.

The electrospinning apparatus includes a power supply, a spinning nozzle, a collector, and the like. The power supply forms an electric field of high voltage between the nozzle and the collector. The spinning nozzle supplies spinning solution to the spinning space. The collector concentrates the electrospun nanofibers. The filaments formed in the spinning space of the electrospinning device may have various average diameters depending on spinning conditions, and may be nanofibers having an average diameter of 50 to 1000 nm.

In the present specification, the term moisture permeable waterproof layer (breathable waterproof nanofiber web) means a layer having moisture permeable and waterproof properties. The moisture permeable waterproof layer may be made of nanofibers, but may be made of various materials including pores suitable for moisture-proof and waterproof properties. The term fabrics refers to fabrics, fabrics or non-woven fabrics that combine with this moisture permeable waterproof layer to form breathable and waterproof fabrics.

The laminating method of the present invention is generally applicable to all cases where two or more sheets having a thin thickness are pressed and bonded, and appropriate technical effects can be exhibited depending on the use thereof.

An adhesive layer is formed on the lower surface of the fabric and a moisture permeable and waterproof layer is formed below the adhesive layer. The breathable waterproof layer should be made of a layer containing pores suitable for waterproof and waterproof properties, but it may be made of nanofiber. Since the nanofibers are fibers having an average diameter of 50 to 1000 nm, the pore size can be controlled by adjusting the thickness of the nanofibers. The nano fiber layer may be made of a polymer resin such as polyurethane, polyvinylidene fluoride or nylon. The nanofiber layer is made of two or more polymers having different melting temperatures, and it is also possible to control the size of the pores by melting the nanofibers composed of at least one of the polymers.

In the process of manufacturing the moisture-permeable and waterproof fabric using the laminating method according to the present invention, the adhesive fluid is first prepared by dissolving the adhesive material in a solvent, and the adhesive fluid is electrospun to form an adhesive layer on one side of the fabric. The fabric with the adhesive layer is laminated with a film having moisture permeability to produce a moisture-permeable waterproof fabric.

At this time, it is possible to use a method of separately laminating a fabric having an adhesive layer formed thereon and a film having moisture-permeable and waterproof properties, or a method of continuously laminating after forming an adhesive layer on a raw material with an electrospinning device.

FIG. 2 is a plan view schematically showing a nozzle body arranged in a nozzle block of an electrospinning device for manufacturing a moisture-permeable and waterproof nanofiber web according to the present invention. FIG. 3 is a cross- FIGS. 4 to 5 are cross-sectional views schematically showing a nozzle body installed in a block. FIG. 4 to FIG. 5 are views showing a method of manufacturing a nanofiber web according to an embodiment of the present invention, Fig. 2 is a plan view schematically showing a radial operation process.

Referring to FIG. 1, an electrospinning apparatus 100 according to the present invention includes a bottom-up electrospinning apparatus and at least one unit 110 or 110 '. In one embodiment of the present invention, the electrospinning device 100 is a bottom-up electrospinning device, but it may also be a top-down electrospinning device.

Here, the units 110 and 110 'include a spinning liquid main tank 120 filled with a polymer spinning solution and a metering pump (not shown) for supplying a polymer spinning solution filled in the spinning solution main tank 120 in a fixed amount And a plurality of nozzle tubes 112 having a plurality of nozzles 111a in the form of pins are arranged in the CD direction of the substrate 115 so as to discharge the polymer solution in the spinning solution main tank 120 A collector 113 disposed at a predetermined distance from the nozzle 111a to accumulate the polymer spinning solution injected from the nozzle block 111 and the nozzle 111a and a voltage generator 113 for generating a high voltage to the collector 113, (114).

As described above, the electrospinning apparatus 100 for manufacturing a nanofiber web is continuously supplied with a predetermined amount of the polymer spinning solution filled in the spinning liquid main tank 120 into the nozzle block 111 to which a high voltage is applied through the metering pump The polymer spinning solution supplied to the nozzle block 111 is radiated and focused on the substrate 115 conveyed in the electrospinning device through the nozzle 111a on the collector 113 with the high voltage applied thereto, .

At least one or more units 110 and 110 'provided in the electrospinning apparatus 100 for manufacturing a nanofiber web are sequentially disposed at predetermined intervals and the polymer solution is supplied through the units 110 and 110' And electrospun to produce a filter material such as a nanofiber web or a nanofiber filter.

In the nozzle tube 112 arranged in the nozzle block 111 of the electrospinning device 100, at least two main fluid solution tanks 120 for supplying the polymer solution are connected.

That is, a plurality of nozzle tubes 112, each having a rectangular parallelepiped shape and having a plurality of nozzles 111a on its upper surface, are arranged in the nozzle block 111 in the CD direction of the substrate 115, The spray liquid main tank 120 provided with the first spinning solution main tank 120a, the second spinning solution main tank 120b and the third spinning solution main tank 120c is connected to the nozzle tube body 112, At least two spinning liquid main tanks 120 are connected to the main tank 112.

Specific nozzle tubes 112a, 112b and 112c of the respective nozzle tubes 112 of the nozzle block 111 are connected to the first spraying liquid main tank 120a and other specific nozzle tubes 112d, 112e and 112f Are connected to the second spinning liquid main tank 120b and the other specific nozzle bodies 112g, 112h and 112i are connected to the third spinning liquid main tank 120c.

To this end, the first spinning solution main tank 120a is connected to the specific nozzle tubes 112a, 112b and 112c of the nozzle block 111 through a first supply tube 121a, and the second spinning solution main tank And 120b are connected to the other nozzle tubes 112d, 112e and 112f of the nozzle block 111 by a second supply tube 121b and the third solution main tank 120c is connected to another nozzle tube 112c of the nozzle block 111 The first, second, and third supply pipes 121a, 121b, and 121c are connected to the nozzle tubes 112a, 112b, 112c, 112d, and 112d by a third supply tube 121c, 112e, 112f, 112g, 112h, 112i.

The first, second, and third supply pipes 121a, 121b, and 121c may be provided with valves (not shown) so as to be openable and closable. 112b, and 112c through the first, second, and third supply pipes 121a, 121b, and 121c, the polymer solution is filled in the first, second, and third spinning liquid main tanks 120a, 120b, 112d, 112e, 112f, 112g, 112h, and 112i. However, the present invention is not limited thereto.

The valve is preferably controllable automatically or manually, and is preferably controllably connected by a controller (not shown), but is not limited thereto.

Here, the polymer spinning solution to be filled in the first spinning solution main tank 120a, the second spinning solution main tank 120b, and the third spinning solution main tank 120c is made of a different polymer spinning solution.

According to the structure described above, the specific nozzle tubes 112a, 112b, and 112c connected to the first spinning solution main tank 120a and the other specific nozzle tubes 112d, 112b, and 112c connected to the second spinning solution main tank 120b, 112e and 112f and the other specific nozzle tubes 112g, 112h and 112i connected to the third spinning solution main tank 120c are electrospun.

The moisture-permeable and waterproof nanofiber web as shown in Figs. 6 to 8 is produced by the electrospinning device as described above. 6 to 8 a to f can be different kinds of polymers described below, in one embodiment a, d, e are polyurethane, and b, c, and f are nylon.

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 continuously producing fibers such as a film or a nonwoven fabric, and the CD direction means a perpendicular direction to the MD direction as a cross direction . MD is also referred to as machine direction / longitudinal direction, and CD is referred to as width direction / transverse direction.

The present invention relates to an electrospinning device in which a polymer constituting a nanofiber is connected to a plurality of nozzle blocks divided into MDs connected to a plurality of tanks, Provides breathable waterproof fabric of different kinds.

Depending on the characteristics of the polymer, the frequency of use of the waterproof and waterproof nanofiber web may be different. Typically, the polyvinylidene fluoride and the polyurethane are mainly used in the moisture permeable and waterproof nanofiber web due to their elasticity and other physical properties. These examples are representative examples according to the needs of the industrial field, and various modifications are available to those skilled in the art.

Hereinafter, the polymer used in the present invention will be described. Polymers of the present invention and polyvinylidene fluoride, polyurethane and nylon are preferable for the polymer.

The polymer may be at least one selected from the group consisting of polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, or a composite composition thereof, a polyurethane, a polyamide, a polyimide, a polyamideimide, a poly (meta-phenylene isophthalate Amide), meta-aramid, polyethylene chlorotrifluoroethylene, polychlorotrifluoroethylene, polymethylmethacrylate, polyacrylonitrile, polyvinylidene chloride, polyvinylidene chloride-acrylonitrile copolymer, polyacrylic Amide, and the like.

First, the polyamide used in the present invention will be described.

Polyamide refers to a generic term for a polymer linked by an amide bond (-CONH-), which can be obtained by condensation polymerization of a diamine and a dicarboxylic acid. Polyamides are characterized by amide bonds in the molecular structure, and their physical properties vary depending on the ratio of amide groups. For example, when the ratio of amide groups in the molecule is increased, specific gravity, melting point, absorbency, rigidity and the like are increased.

In addition, polyamide is a material used in a wide range of fields such as clothing, tire cord, carpet, rope, computer ribbon, parachute, plastic and adhesive due to its excellent resistance to corrosion, abrasion resistance, chemical resistance and insulation.

Generally, polyamides are classified into aromatic polyamides and aliphatic polyamides. Representative aliphatic polyamides include nylon. Nylon is originally a trademark of DuPont, Inc., but is now used as a generic name.

Nylon is a hygroscopic polymer and is sensitive to temperature. Representative nylons include nylon 6, nylon 66, and nylon 46.

First, nylon 6 is characterized by excellent heat resistance, moldability and chemical resistance, and is produced by ring-opening polymerization of ε-caprolactam in order to produce it. Nylon 6 means that caprolactam has 6 carbon atoms.

(Scheme 1) Nylon 6 polymerization of caprolactam

On the other hand, nylon 66 is generally similar in properties to nylon 6, but is superior in heat resistance to nylon 6 and superior in self-extinguishing and abrasion resistance. Nylon 66 is prepared by dehydration condensation polymerization of hexamethylenediamine and adipic acid.

(Scheme 2) Dehydration condensation of hexamethylenediamine with adipic acid Nylon 66 polymerization by polymerization

Nylon 46 is also excellent in heat resistance, mechanical properties and impact resistance, and has a high processing temperature. Nylon 46 is prepared by polycondensation of tetramethylenediamine and adipic acid. Diaminobutane (DAB), a raw material, is prepared from the reaction of acrylonitrile with hydrogen cyanide. In the first stage of the polymerization operation, a salt is formed from diaminobutane and adipic acid, and the mixture is polymerized under appropriate pressure The prepolymer is converted into a prepolymer and the solid of the prepolymer is polymerized at a solid state by treatment at about 250 ° C in the presence of nitrogen and water vapor.

Nylon 46, in particular, is characterized by a high amide concentration and a regular arrangement between the methylene and amide groups. The melting point of nylon 46 is about 295 ° C, which is higher than that of other types of nylon, and has attracted attention as a resin having excellent heat resistance due to the above characteristics.

The present invention provides a breathable and waterproof fabric having a different fiber diameter in the CD direction on a substrate using the polyamide, and a method for producing the same.

The polyvinylidene fluoride used in the present invention will now be described. The polyvinylidene fluoride (PVDF) resin is one of the fluoro-based polymers, and the fluororesin contains fluorine, which is excellent in thermal and chemical properties. In producing a spinning solution in which polyvinylidene fluoride is dissolved in an appropriate organic solvent, the polyvinylidene fluoride includes a homopolymer of vinylidene fluoride or a copolymerized polymer containing vinylidene fluoride in a molar ratio of 50% or more , A homopolymer is more preferable from the viewpoint of excellent strength of the polyvinylidene fluoride resin. When the polyvinylidene fluoride resin is a copolymer polymer, known copolymerizable monomers copolymerized with vinylidene fluoride monomers may be suitably used For example, fluorine-based monomers and chlorine-based monomers can be suitably used.

The weight average molecular weight (Mw) is not particularly limited, but is preferably 10,000 to 500,000, more preferably 50,000 to 500,000, and when the weight average molecular weight of the polyvinylidene fluoride resin is less than 10,000, The fibers can not obtain sufficient strength. When the number average molecular weight exceeds 500,000, the handling of the solution is not easy, and the processability is deteriorated, making it difficult to obtain uniform nanofibers.

Among the polymers to be used in the present invention, polyacrylonitrile may be preferably used.

Generally, polyacrylonitrile (PAN) refers to a polymer of acrylonitrile (CH2 = CHCN).

(Reaction formula 3) The unit of polyacrylonitrile

Here, the polyacrylonitrile resin is a copolymer made from a mixture of acrylonitrile and a monomer constituting the majority. Frequently used monomers include butadiene styrene vinylidene chloride or other vinyl compounds. The acrylic fiber contains at least 85% acrylonitrile, and the mode acrylic contains 35 to 85% acrylonitrile. When other monomers are included, the fiber has the property of increasing the affinity to the dye. More specifically, in the production of an acrylonitrile-based copolymer and spinning solution, in the case of producing an acrylonitrile-based copolymer, there is little contamination of nozzles in the course of manufacturing ultrafine fibers by electrospinning, Thereby increasing the solubility in the solvent and imparting better mechanical properties. In addition, polyacrylonitrile has a softening point of 300 ° C or more and is excellent in heat resistance.

The degree of polymerization of the polyacrylonitrile is preferably 1,000 to 1,000,000, and more preferably 2,000 to 1,000,000.

The polyacrylonitrile is preferably used within a range that satisfies the usage amount of the acrylonitrile monomer, the hydrophobic monomer and the hydrophilic monomer. When the polymer is polymerized, the weight% of the acrylonitrile monomer is too low to be electrospun when the weight% of the hydrophilic monomer and the weight% of the hydrophobic monomer are 3: 4 and the total monomer is less than 60, It is difficult to form a stable jet (JET) at the time of electrospinning as well as to cause contamination of the nozzle. If the ratio is more than 99, the spinning viscosity is too high to spin, and even if an additive capable of lowering the viscosity is added, the diameter of the microfine fibers becomes too large and the productivity of electrospray is too low to achieve the object of the present invention.

In addition, as much amount of comonomer is added to the acrylic polymer, the amount of the crosslinking agent must be increased so that the stability of electrospinning can be secured and deterioration of the mechanical properties of the nanofiber can be prevented.

The hydrophobic monomer may be an ethylene-based compound such as methacrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, vinyl acetate, vinyl pyrrolidone, vinylidene chloride or vinyl chloride, It is preferable to use at least one selected.

Wherein the hydrophilic monomer is selected from the group consisting of acrylic acid, allyl alcohol, methallyl alcohol, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, butanediol monoacrylate, dimethylaminoethyl acrylate, butent ricarboxylic acid, vinyl It is preferable to use at least one selected from ethylene-based compounds such as sulfonic acid, allylsulfonic acid, methallylsulfonic acid, and para-styrenesulfonic acid and polyvalent acids or derivatives thereof.

As the initiator to be used for preparing the acrylonitrile-based polymer, an azo-based compound or a sulfate compound may be used, but it is generally preferable to use a radical initiator used for the oxidation-reduction reaction.

Among the polymers used in the present invention, polyethersulfone can also be preferably used.

In general, polyethersulfone (PES) is an amber transparent, amorphous resin having the following repeating unit, and is generally produced by condensation polymerization of dichlorodiphenylsulfone.

(Reaction formula 4) The unit of polyether sulfone

Polyethersulfone is a super heat resistant engineering plastic developed by ICI in the UK. It is a highly heat resistant polymer among thermoplastic plastics. Since the polyethersulfone is amorphous, the physical properties of the polyether sulfone are not lowered by temperature rise, and the temperature dependency of the flexural modulus is small, so that it hardly changes at -100 to 200 캜. The load-strain temperature is 200 to 220 占 폚, and the glass transition temperature is 225 占 폚. In addition, the creep resistance up to 180 占 폚 is the most excellent among the thermoplastic resins, and has the characteristic of being resistant to hot water and steam at 150 to 160 占 폚.

Due to such characteristics, polyethersulfone is used in optical disks, magnetic disks, electric and electronic fields, hydrothermal fields, automobile fields, and heat resistant paints.

Examples of the solvent usable with the polyethersulfone include acetone, tetrahydrofuran, methylene chloride, chloroform, dimethylformamide (DMF), dimethylacetamide (DMAc), N- N-methyl pyrrolidone (NMP), cyclohexane, water, or a mixture thereof, but the present invention is not limited thereto.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to examples. However, the embodiments according to the present invention can be modified into various other forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. Embodiments of the invention are provided to more fully describe the present invention to those skilled in the art.

Example 1

A polyurethane solution having a weight average molecular weight of 157,000 is dissolved in dimethylformamide (DMF) to prepare a polyurethane solution and a polyvinylidene fluoride solution. The polyurethane solution and the polyvinylidene fluoride solution were put into each of the spinning liquid main tanks, and the applied voltage was applied to the nozzle block designed to be divided into two parts in the CD direction and to be connected to independent main tanks at an applied voltage of 20 kV, And electrospun on a substrate having a basis weight of 30 gsm. Polyurethane nanofiber nonwoven fabric 1 m in one direction in the CD direction on the electrospun cellulose substrate and nonwoven fabric of polyvinylidene fluoride nanofiber 1 m in the remaining one direction were coated with polyurethane-polyvinylsiloxane having an average diameter of 200 nm and a CD width of 2 m A polyurethane-polyvinylidene fluoride breathable and waterproof nanofiber web was prepared. At this time, bottom-up electrospinning was performed under the conditions of a distance between the electrode and the collector of 40 cm, a spinning liquid flow rate of 0.1 mL / h, a temperature of 22 ° C, and a humidity of 20%.

Example 2

A polyurethane solution having a weight average molecular weight of 157,000 is dissolved in dimethylformamide (DMF) to prepare a polyurethane solution and a polyvinylidene fluoride solution. The polyurethane solution and the polyvinylidene fluoride solution were put into each of the spinning liquid main tanks, the nozzle block was separated into three parts in the CD direction, and the applied voltage was applied to the nozzle block designed to be connected to the independent main tanks at an applied voltage of 20 kV, And electrospun on a substrate having a basis weight of 30 gsm. The intermediate portion of the CD direction on the electrospun cellulose substrate was a polyurethane nanofiber nonwoven fabric and the remaining portion was a polyurethane-polyvinylidene fluoride having a CD diameter of 2 m and an average diameter of 200 nm as a nonwoven fabric of polyvinylidene fluoride nanofiber A nanofiber nonwoven fabric was formed to prepare a polyurethane-polyvinylidene fluoride breathable and waterproof nanofiber web. At this time, bottom-up electrospinning was performed under the conditions of a distance between the electrode and the collector of 40 cm, a spinning liquid flow rate of 0.1 mL / h, a temperature of 22 ° C, and a humidity of 20%.

Example 3

A polyurethane solution having a weight average molecular weight of 157,000 is dissolved in dimethylformamide (DMF) to prepare a polyurethane solution and a polyvinylidene fluoride solution. The polyurethane solution and the polyvinylidene fluoride solution were put into each of the spinning liquid main tanks, and the applied voltage was applied to the nozzle block designed to be connected to the independent main tanks separated into nine parts in the CD direction by 20 kV, And electrospun on a substrate having a basis weight of 30 gsm. A polyurethane-polyvinylidene fluoride nanofiber nonwoven fabric having an average diameter of 200 nm and a CD width of 2 m is alternately formed on the electrospun cellulose substrate in the direction of CD to form a polyurethane-polyvinylidene fluoride nanofiber nonwoven fabric, - Polyvinylidene fluoride breathable waterproof nanofiber webs were prepared. At this time, bottom-up electrospinning was performed under the conditions of a distance between the electrode and the collector of 40 cm, a spinning liquid flow rate of 0.1 mL / h, a temperature of 22 ° C, and a humidity of 20%.

Examples 4 to 6

Examples 1 to 3 were carried out in the same manner except that polyether sulfone was used instead of polyurethane.

Examples 7 to 12

A polyurethane adhesive layer was formed on one side of the polyvinylidene fluoride fabric using an electrospinning apparatus and the fabric was continuously supplied to the laminating apparatus. In the laminating apparatus, the fabric having the adhesive layer formed thereon and the breathable and waterproof nano- The fiber webs were laminated to produce a breathable and waterproof fabric.

100: electrospinning device, 110, 110 ': unit,
111: nozzle block, 111a: nozzle,
112: nozzle body,
112a, 112b, 112c, 112d, 112e, 112f, 112g, 112h, 112i:
113: collector, 114: voltage generator,
115: substrate, 115a: PU nanofiber web,
115b: PVDF nanofiber web, 115c: PU nanofiber web,
116a: conveying belt, 116b: conveying roller,
120: spinning liquid main tank, 120a: first spinning liquid main tank,
120b: a second spinning solution main tank, 120c: a third spinning solution main tank,
121a: first supply pipe, 121b: second supply pipe,
121c: third supply pipe,
a, b, c, d, e, and f: polymers of different types.

Claims (7)

A method for manufacturing a moisture-permeable, water-resistant nanofiber web using bottom-up electrospinning, the method comprising the steps of: preparing a bottom-up electrospinning unit comprising a bottom-up electrospinning unit including a plurality of nozzle tubes, A method of manufacturing a web.
The method according to claim 1,
Wherein the nanofiber polymer is prepared by differently controlling the kinds of the polymer solution injected into the plurality of nozzle tubes to manipulate the nanofiber polymers differently. A method of making a fibrous web.
The method according to claim 1,
Wherein the one direction polymer in the CD direction is polyurethane and the other one direction polyvinylidene fluoride is polyvinylidene fluoride. The method for producing a moisture permeable, waterproof nanofiber web according to claim 1,
3. The method of claim 2,
Wherein the moisture permeable and waterproof nanofibrous web is divided into three portions in the direction of CD and the middle portion is polyurethane and the remaining portion is polyvinylidene fluoride. Gt;
3. The method of claim 2,
Wherein the different types of polymer are alternately arranged in the direction of the CD. The method of manufacturing a moisture permeable, waterproof nanofiber web according to claim 1,
A moisture permeable, waterproof nanofiber web prepared by the method of any one of claims 1 to 5.
A breathable waterproof fabric produced by laminating a breathable, waterproof nanofiber web prepared by the method of any one of claims 1 to 5 on a fabric.

Images