KR100990481B1 - Highly hygroscopic nonwoven fabric consisting of nano fiber and process for preparing the same - Google Patents

Abstract

The present invention relates to a super hygroscopic nanofiber nonwoven fabric prepared by electrospinning a spinning solution containing a hygroscopic material-forming fiber-forming polymer, a hygroscopic material, and a solvent, and a method of manufacturing the same.

The super hygroscopic nanofiber nonwoven fabric of the present invention has an excellent contact area between the hygroscopic material and the air, so the moisture absorption rate and absorption rate are excellent, and the impregnation process for the hygroscopic material of the fiber and the post-treatment process such as weaving or nonwoven fabric are unnecessary. It is manufactured very economically.

Nanofiber, hygroscopic, deliquescent, electrospinning

Description

Super hygroscopic nanofiber nonwoven fabric and its manufacturing method {HIGHLY HYGROSCOPIC NONWOVEN FABRIC CONSISTING OF NANO FIBER AND PROCESS FOR PREPARING THE SAME}

The present invention relates to a super hygroscopic nanofiber nonwoven fabric produced by electrospinning and a method for producing the same.

Various types of moisture absorbents are used as means for removing moisture in the air. Typical examples include silica gel, zeolite, activated carbon, activated alumina (Al ₂ O ₃ ), sodium sulfate (Na ₂ SO ₄ ), etc. It is manufactured in the form and applied to various industrial and household products, but it is not satisfactory in terms of absorption (adsorption amount), absorption (adsorption) rate and formability. In addition, sulfur trioxide (SO ₃ ), Acid anhydrides such as phosphoric anhydride (P ₂ O ₅ ) are used, and lithium chloride (LiCl), calcium chloride (CaCl ₂ ), lithium bromide (LiBr), substances that absorb moisture in the air while the salt is dissolved ), Magnesium chloride (MgCl ₂ ) and other deliquescent salts have a very fast absorption rate and a large amount of absorption, and are used in various forms in industrial preparation, food industry, and pharmaceutical industry. However, when the hygroscopic material is mixed and spun onto the fiber by melt spinning or solution spinning by the conventional method, the diameter of the fiber is several tens to hundreds of micrometers, so that the specific surface area of contact with air is small, so that the characteristics of the hygroscopic material are sufficiently expressed. There is a drawback that, when spinning, fiber trimming, or weaving and nonwoven fabric damage the processing equipment.

Therefore, conventional hygroscopic fibers produced as a means for removing moisture in the air have been produced using a method such as impregnating a water-swellable polymer fiber with a hygroscopic material and then performing crosslinking treatment (Japanese Patent Laid-Open No. 01-299624). . The hygroscopic fiber produced by this method has the advantage of easy processing in various forms and rapid absorption and desorption rate, but after manufacturing the fiber (after spinning), post-processing such as impregnating, drying, and crosslinking the fiber in the aqueous solution of the absorbent. There is a disadvantage that treatment is required.

Another method of manufacturing the hygroscopic fibers is to hydrophilize and spin the hydrophobic raw material polymer, or to spin the hydrophilic monomer (monomer) and then graft (graft) copolymerization, the hydrophilic material is coated on the fiber surface In addition, as a method of imparting hygroscopicity by physical condensation, a method of using hollow fibers, a sectioned yarn or the like using a capillary phenomenon by making the fiber structure porous has been proposed.

However, the hygroscopic fibers manufactured by the above method are composed of tens to hundreds of micrometers in fiber diameter, so the specific surface area is not satisfactory in terms of water absorption and absorption rate. There is a problem that the molding process causes an increase in cost.

In addition, a method of producing a hygroscopic fiber having high whiteness to which functionalities such as flame retardancy and antimicrobial properties are imparted by performing crosslinking treatment, hydrolysis and reduction treatment using a hydrazin-based compound (Korea Patent Publication No. 2003-0074649) And the like have been proposed, but have the same problems as pointed out above.

The present invention is to solve the above problems of the prior art, and compared with the conventional hygroscopic fibers by increasing the specific surface area of the fiber significantly, by expanding the contact area of the hygroscopic material and air to increase the water absorption and absorption rate It is very excellent and economically manufactured because it does not need the impregnation process for the hygroscopic material of the fiber and the post-treatment process such as weaving or non-woven fabric. It is an object of the present invention to provide a super hygroscopic nanofiber nonwoven fabric and a method for producing the same.

The present invention provides a superhygroscopic nanofiber nonwoven fabric prepared by electrospinning a spinning solution containing a hygroscopic material-forming fiber-forming polymer, a hygroscopic material, and a solvent.

In addition,

A first spinning solution for forming a hygroscopic material-containing portion comprising a fiber-forming polymer for fixing hygroscopic material, a hygroscopic material, and a solvent; And a second spinning solution for forming a fiber strength reinforcement part, comprising a fiber-forming polymer for strength reinforcement and a solvent,

Provides a super hygroscopic nanofiber nonwoven fabric having a nanofiber cross-section consisting of a hygroscopic material-containing portion and a fiber-strength reinforcing portion, in which an injection hole of a first spinning solution and a second spinning solution are separated and the spinneret is manufactured by electrospinning through a nozzle formed as one. do.

In addition,

A first spinning solution for forming a hygroscopic material-containing portion comprising a fiber-forming polymer for fixing hygroscopic material, a hygroscopic material, and a solvent; And a second spinning solution for forming a fiber strength reinforcement part, comprising a fiber-forming polymer for strength reinforcement and a solvent,

Sheath part forming spinneret injection hole, sheath part spinneret spinneret, core part spinneret injection hole, and core part spinneret spinneret, The nanofiber cross-section, which is produced by sand duplex electrospinning so that any one of the first spinning solution and the second spinning solution forms a sheath and the other forms a core using a nozzle installed inside the spinneret forming a spinneret. Provided is a superhygroscopic nanofiber nonwoven fabric composed of a hygroscopic material-containing portion and a fiber strength reinforcement portion.

In addition,

Preparing a first spinning solution for forming a hygroscopic material-containing portion comprising a fiber-forming polymer for fixing a hygroscopic material, a hygroscopic material, and a solvent;

Preparing a second spinning solution for forming a fiber strength reinforcement part comprising a fiber-forming polymer for strength reinforcement and a solvent; And

An ultra-hygroscopic nanofiber nonwoven fabric having a hygroscopic material-containing portion and a fiber strength reinforcing portion including a nanofiber cross section including the step of electrospinning the first spinning solution and the second spinning solution through a nozzle having a single injection port and a spinneret formed as one. It provides a method of manufacturing.

In addition,

Preparing a first spinning solution for forming a hygroscopic material-containing portion comprising a fiber-forming polymer for fixing a hygroscopic material, a hygroscopic material, and a solvent;

Preparing a second spinning solution for forming a fiber strength reinforcement part comprising a fiber-forming polymer for strength reinforcement and a solvent; And

Sheath part forming spinneret injection hole, sheath part spinneret spinneret, core part spinneret injection hole, and core part spinneret spinneret, A sand fiber cross-section comprising a step of electrospinning so that one of the first spinning solution and the second spinning solution to form a sheath portion and the other to form a core portion by using a nozzle installed inside the spinneret forming a spinneret Provided is a method for producing a superhygroscopic nanofiber nonwoven fabric comprising the hygroscopic material-containing portion and the fiber strength reinforcing portion.

The super hygroscopic nanofiber nonwoven fabric of the present invention has an excellent contact area between the hygroscopic material and the air, so the moisture absorption rate and absorption rate are excellent, and the impregnation process for the hygroscopic material of the fiber and the post-treatment process such as weaving or nonwoven fabric are unnecessary. It is manufactured very economically, and it is possible to give unique characteristics such as improved mechanical strength and formability according to the change of cross-sectional structure of short fibers, thus providing a wide range of applications.

The present invention relates to a super hygroscopic nanofiber nonwoven fabric prepared by electrospinning a spinning solution comprising a fiber-forming polymer for fixing a hygroscopic material, a hygroscopic material, and a solvent.

The fiber-forming polymer for fixing the hygroscopic material may be used as long as it forms a fibrous structure by electrospinning with a thermoplastic and thermosetting polymer. Specific examples include polyurethane, nylon, polymethylmethacrylate, polyvinylalcohol, polyacrylonitrile, polyvinylidene fluoride, Polyimide, polystyrene, polyvinylpyrrolidone, polyvinyl chloride, polycarbonate, cellulose acetate, polylatic acid polymer, Starch, chitosan, and the like, and these may be used alone or in combination of two or more.

As the hygroscopic material, materials known in the art may be used without limitation, and in particular, a deliquescent salt material may be preferably used. Lithium chloride (LiCl), calcium chloride (CaCl ₂ ), magnesium chloride (MgCl ₂ ), zinc chloride (ZnCl ₂ ), lithium bromide (LiBr), potassium chloride (KCl), sodium bromide (NaBr), brominated Potassium (KBr), potassium hydroxide (KOH), sodium hydroxide (NaOH), sodium sulfate (Na ₂ SO ₄ ) and the like, these may be used alone or in combination of two or more.

The content of the hygroscopic material is preferably 3 to 70 parts by weight (based on solids) based on 100 parts by weight of the fiber-forming polymer solid content for fixing the hygroscopic material. If the content of the hygroscopic material is less than 3 parts by weight, the moisture absorption function is insignificant, and if it exceeds 70 parts by weight, electrospinning may be difficult.

The solvent may be used without any limitation as long as it can dissolve fiber-forming polymers and hygroscopic materials. Specific examples of such solvents include dimethyl acetamide (DMA), N, N-dimethylformamide (DMF), N-methyl-2-pyrrolidinone (NMP), dimethyl sulfoxide (DMSO), tetra-hydrofuran (THF), and ethylene carbonate (EC). , DEC (diethyl carbonate), DMC (dimethyl carbonate), EMC (ethyl methyl carbonate), PC (propylene carbonate), acetone (acetone) and water (water), and the like, these may be used together with one or more Can be.

Viscosity of the spinning solution in the above is preferably 50 ~ 50,000 CPS spinning proceeds smoothly. When the viscosity of spinning solution exceeds 50,000 CPS, electrospinning becomes difficult, and even if spinning, the thickness of the fiber becomes 3 µm or more. In addition, when the spinning solution has a viscosity of less than 50 CPS, the viscosity is too low. impossible.

The spinning solution may further include functional natural extracts such as antibacterial, deodorant, aroma, and the like, and additives that are typically added to the spinning solution in the manufacture of nanofibers may further include components such as viscosity modifiers.

In addition,

A first spinning solution for forming a hygroscopic material-containing portion comprising a fiber-forming polymer for fixing hygroscopic material, a hygroscopic material, and a solvent; And a second spinning solution for forming a fiber strength reinforcement part, comprising a fiber-forming polymer for strength reinforcement and a solvent,

A super hygroscopic nanofiber nonwoven fabric comprising a hygroscopic material-containing portion and a fiber strength reinforcing portion, in which a nanofiber cross section is manufactured by electrospinning through a nozzle formed with a single nozzle and a spinneret is separated and the spinneret is separated into one. will be.

The details of the hygroscopic material and the solvent in the above are the same as those described above, and in the case of the hygroscopic material-fixing fiber-forming polymer and the strength-reinforcing fiber-forming polymer, the content of the fiber-forming polymer described above applies equally. do. In addition, the viscosity of the first spinning solution and the second spinning solution is also the same as described above.

In the above, the injection holes of the first spinning solution and the second spinning solution are separated and the nozzle having one spinneret can be manufactured in various shapes. For example, as shown in (c) of FIG. 1, the spinneret may be manufactured by installing a panel-shaped separator that separates the first spinning solution and the second spinning solution to a predetermined depth.

In addition,

A first spinning solution for forming a hygroscopic material-containing portion comprising a fiber-forming polymer for fixing hygroscopic material, a hygroscopic material, and a solvent; And a second spinning solution for forming a fiber strength reinforcement part, comprising a fiber-forming polymer for strength reinforcement and a solvent,

Sheath part forming spinneret injection hole, sheath part spinneret spinneret, core part spinneret injection hole, and core part spinneret spinneret, The nanofiber cross-section, which is produced by sand duplex electrospinning so that any one of the first spinning solution and the second spinning solution forms a sheath and the other forms a core using a nozzle installed inside the spinneret forming a spinneret. A super hygroscopic nanofiber nonwoven fabric composed of a hygroscopic material-containing portion and a fiber strength reinforcement portion.

The details of the hygroscopic material and the solvent in the above are the same as those described above, and in the case of the hygroscopic material-fixing fiber-forming polymer and the strength-reinforcing fiber-forming polymer, the content of the fiber-forming polymer described above applies equally. do. In addition, the viscosity of the first spinning solution and the second spinning solution is also the same as described above.

It comprises a sheath part forming spinneret injection port, sheath part forming spinneret spinneret, core part forming spinneret injection hole, and core part forming spinneret spinneret, The nozzles in which the use liquid spinneret is installed in the sheath portion-forming spinneret spinneret may be manufactured in various shapes. For example, as shown in (b) of FIG. 1, a core part spinning solution spinneret is installed inside the sheath part spinning solution spinneret, and the core part spinning solution spinneret is connected to a core part spinning spinneret injection hole outside the nozzle. It can be manufactured in the form.

Since the superhygroscopic nanofiber nonwoven fabric of the present invention described above is composed of nanofibers having a diameter of less than 1 μm, the specific surface area relative to the volume is very large, thereby showing an excellent function in terms of absorption and absorption rate. Specifically, the superhygroscopic nanofiber nonwoven fabric of the present invention has an equilibrium moisture content of 10 to 2,000% by weight (measurement condition: 20 ° C., RH 65 to 95), and a basis weight of 5 to 1,000 gsm. It can be molded into various forms such as materials.

In addition, the superhygroscopic nanofiber nonwoven fabric of the present invention, as shown in Figure 1, the nanofibers according to the shape of the nozzle (a) the hygroscopic material is uniformly dispersed throughout the nanofiber, (b) sheath part And one of the core parts is composed of a polymer containing a hygroscopic material and the other is composed of a polymer for reinforcing fiber strength, that is, sheath / core (S / C) type, (c ) Only one side of the nanofiber contains hygroscopic material, and the other side is composed of polymer for strengthening fiber strength, that is, it can be configured as side by side (S / S) type, so that the mechanical strength and molding It can be made of super-hygroscopic nanofibers to meet the needs of various users, such as improved performance.

In addition,

Preparing a first spinning solution for forming a hygroscopic material-containing portion comprising a fiber-forming polymer for fixing a hygroscopic material, a hygroscopic material, and a solvent;

Preparing a second spinning solution for forming a fiber strength reinforcement part comprising a fiber-forming polymer for strength reinforcement and a solvent; And

An ultra-hygroscopic nanofiber nonwoven fabric having a hygroscopic material-containing portion and a fiber strength reinforcing portion including a nanofiber cross section including the step of electrospinning the first spinning solution and the second spinning solution through a nozzle having a single injection port and a spinneret formed as one. It relates to a manufacturing method of.

The details of the hygroscopic material and the solvent in the above are the same as those described above, and in the case of the hygroscopic material-fixing fiber-forming polymer and the strength-reinforcing fiber-forming polymer, the content of the fiber-forming polymer described above applies equally. do. Further, the details of the viscosity of the first spinning solution and the second spinning solution and the nozzles used are the same as described above.

The first spinning solution is prepared by first dissolving a fiber-forming polymer in a solvent and then mixing a hygroscopic material.

In the electrospinning, the first and second spinning solutions are supplied to the electrospinning nozzle using a spinning solution supply device, and a high voltage (1.5 kV to 100 kV) is generated by using a high voltage generator between the nozzle and the current collector. It is formed and carried out. The magnitude of the electric field is related to the distance between the nozzle and the current collector, and in order to facilitate the electrospinning, a relationship between them is used in combination. In this case, as the electrospinning apparatus to be used, generally used ones may be used, and an electro-blowing method or a centrifugal electrospinning method may be used. Nanofibers prepared by the method as described above is in the form of a non-woven fabric composed mostly of less than 1㎛ diameter.

In addition,

Preparing a first spinning solution for forming a hygroscopic material-containing portion comprising a fiber-forming polymer for fixing a hygroscopic material, a hygroscopic material, and a solvent;

Preparing a second spinning solution for forming a fiber strength reinforcement part comprising a fiber-forming polymer for strength reinforcement and a solvent; And

Sheath part forming spinneret injection hole, sheath part spinneret spinneret, core part spinneret injection hole, and core part spinneret spinneret, A sand fiber cross-section comprising a step of electrospinning so that one of the first spinning solution and the second spinning solution to form a sheath portion and the other to form a core portion by using a nozzle installed inside the spinneret forming a spinneret A super hygroscopic nanofiber nonwoven fabric comprising the hygroscopic material-containing portion and the fiber strength reinforcing portion.

The details of the hygroscopic material and the solvent in the above are the same as those described above, and in the case of the hygroscopic material-fixing fiber-forming polymer and the strength-reinforcing fiber-forming polymer, the content of the fiber-forming polymer described above applies equally. do. In addition, the details of the viscosity of the first spinning solution and the second spinning solution, the nozzles used, and electrospinning are the same as described above.

Hereinafter, the present invention will be described in more detail using examples. However, the following examples are provided to illustrate the present invention, and the present invention is not limited to the following examples and may be variously modified and changed.

Example  One.

Polyacrylonitrile (PAN) was mixed with DMF (dimethylformamide) as a solvent so as to be included in an amount of 15% by weight (based on solids) based on the total weight of the polymer solution. To prepare a polymer solution. In this way, calcium chloride (CaCl ₂ ) was mixed and stirred so as to be 5, 10, 20, 30, and 50 parts by weight (based on solids), respectively, based on 100 parts by weight of PAN solids contained in the polymer solution. The containing spinning solution was prepared. The nanofibers were manufactured by the method using the nozzle as shown in FIG.

A scanning electron micrograph of PAN nanofibers containing 30 parts by weight of calcium chloride based on 100 parts by weight of PAN solid content is shown in FIG. 2. The average diameter of the electrospun nanofibers was about 400 nm.

Example  2.

Polyvinyl alcohol (polyvinylachol (PVA)) is mixed with DMF (dimethylformamide) as a solvent so as to include 15% by weight (based on solids) based on the total weight of the polymer solution, dissolved at 24 ° C with stirring for 24 hours, and then cooled to room temperature The solution was prepared. Lithium chloride (LiCl) was mixed and stirred so as to be 5, 10, 20, 30 and 50 parts by weight (based on solids), respectively, based on 100 parts by weight of PVA solids contained in the polymer solution. The containing spinning solution was prepared. The nanofibers were manufactured by the method of using a nozzle as shown in FIG. 1A by configuring the applied spinning solution to have an applied voltage of 20 kV and a distance of 25 cm between the spinneret and the current collector.

Scanning electron micrographs of PVA nanofibers containing 5 parts by weight (a) and 50 parts by weight (b) of lithium chloride, respectively, based on 100 parts by weight of PVA solids, are shown in FIG. 3, from which the content of lithium chloride may be increased. It was confirmed that the structure of the bead (bead) increases.

Example  3.

N, N-dimethylacetamide (DMAc) and acetone (weight ratio, 2: 8) so that the cellulose acetate (CA) resin is contained in 15% by weight (based on solids) based on the total weight of the polymer solution. Into a mixed solvent of) and dissolved for 24 hours while stirring at a temperature of 60 ℃, and cooled to room temperature to prepare a polymer solution. The first spinning solution containing deliquescent salts was prepared by mixing and stirring calcium chloride (CaCl ₂ ) to 50 parts by weight (based on solids) based on 100 parts by weight of CA solids contained in the polymer solution. .

Polyurethane (PU) is mixed with DMF (dimethylformamide), which is a solvent, so as to be included in 15 wt% (based on solids) based on the total weight of the second spinning solution, and dissolved at a temperature of 60 ° C. for 24 hours, followed by cooling to room temperature. To prepare a second spinning solution.

A cellulose acetate (CA) polymer and calcium chloride (CaCl ₂ ) included in the first spinning solution are formed using a nozzle as shown in FIG. 1B to form a sheath part, and the PU component is a core part. Nanofibers were prepared by electrospinning to form a core part.

The scanning electron micrograph of the superhygroscopic nanofibers prepared above is shown in FIG. 4. The diameter of the nanofibers is distributed about 300 ~ 800nm, when photographed at a high magnification (Fig. 4 (c)), it was confirmed that the pore structure is formed on the surface of the rapid release of acetone.

Example  4.

Nanofibers were prepared by electrospinning the first spinning solution and the second spinning solution prepared in the same composition and method as Example 3 with the nozzles having the structure as shown in FIG.

Comparative example  One.

PAN nanofibers containing no deliquescent salts were prepared in the same manner as in Example 1.

Comparative example  2.

In order to compare the superabsorbent nanofibers and the water absorption, it was evaluated using the particulate silica gel of TIPGE Co., Ltd. (TPG), which is commercially available as an absorbent.

Comparative example  3.

In order to compare the superabsorbent nanofibers with the water absorption, Daehwa Chemical Co., Ltd. powdered calcium chloride sold as a hygroscopic agent was compared and evaluated.

Test Example : Of nanofiber Moisture absorption  Measurement (Equilibrium Function Rate Measurement)

5.0 g of the samples of Examples 1 to 4 and Comparative Examples 1 to 3 were dried in a 120 ° C. hot air dryer for 5 hours, and then weighed (W1 g). The dried sample was placed in a humidity chamber having a temperature condition of 20 ° C. and a humidity condition of predetermined (RH 65, 85, 95), and subjected to a hygroscopic test for 48 hours to measure the weight (W2g). Using the sample thus measured, the moisture absorption of the nanofibers was calculated by the following equation (1) and shown in Table 1.

............(1)

............(One)

division Example 1 Example 2 practice
Example 3 practice
Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Absorbent content
(Parts by weight) 5 10 20 30 50 5 10 20 30 50 50 50 - - - Moisture absorption
(%) RH 65 20 30 45 55 180 30 65 90 110 600 200 300 One 20 75 RH 85 38 50 75 90 380 60 85 180 200 1200 370 400 3 28 195 RH 95 55 100 150 200 560 80 140 230 600 1950 550 550 5 35 450

As can be seen from the test results of Table 1, the moisture absorption rate was directly proportional to the content of the humidity and the moisture absorption component, and the super hygroscopic nanofibers of Examples 1 to 5 of the present invention are very excellent hygroscopicity compared to Comparative Examples 1 to 3 Indicated.

Figure 1 shows the cross-sectional structure of the superhygroscopic nanofibers of the present invention according to the nozzle shape [(a) nanofibers in which the hygroscopic material is uniformly dispersed throughout the nanofibers, (b) sheath / core (S / C) Type nanofibers, (c) side by side (S / S) type nanofibers].

FIG. 2 is a scanning electron micrograph of PAN nanofibers containing 30 parts by weight of CaCl ₂ (based on solids) based on 100 parts by weight of PAN solids prepared in Example 1 of the present invention ((a) magnification x 1K, (b) ) Magnification x 10K].

Figure 3 is a scanning electron micrograph of PVA nanofibers containing 5 parts by weight (a) and 50 parts by weight (b) of LiCl (based on solids), respectively, based on 100 parts by weight of the PVA solids prepared in Example 2 of the present invention. [A containing 5 parts by weight of LiCl and (b) 50 parts by weight of LiCl].

4 is a scanning electron microscope of sheath / core (S / C) type CA / PU composite nanofibers containing 50 parts by weight of CaCl ₂ (based on solids) based on 100 parts by weight of CA solids prepared in Example 3 of the present invention. It is a photograph [(a) magnification x 1K, (b) magnification x 10K, (c) magnification x 30K].

* Detailed description of the drawings

100: hygroscopic substance containing part

200: fiber strength reinforcement

Claims (11)

delete A first spinning solution for forming a hygroscopic material-containing portion comprising a fiber-forming polymer for fixing hygroscopic material, a hygroscopic material, and a solvent; And a second spinning solution for forming a fiber strength reinforcement part, comprising a fiber-forming polymer for strength reinforcement and a solvent, A super hygroscopic nanofiber nonwoven fabric having a hygroscopic material-containing portion and a fiber-strength reinforcing portion in which a nanofiber cross-section is prepared by electrospinning through a nozzle formed with one nozzle and a spinneret is separated from the first spinning solution and the second spinning solution. A first spinning solution for forming a hygroscopic material-containing portion comprising a fiber-forming polymer for fixing hygroscopic material, a hygroscopic material, and a solvent; And a second spinning solution for forming a fiber strength reinforcement part, comprising a fiber-forming polymer for strength reinforcement and a solvent, Sheath part forming spinneret injection hole, sheath part spinneret spinneret, core part spinneret injection hole, and core part spinneret spinneret, Hygroscopic nanofiber cross section produced by sand duplex electrospinning so that any one of the first spinning solution and the second spinning solution forms a sheath and the other forms a core by using a nozzle installed inside the spinneret. Super hygroscopic nanofiber nonwoven fabric consisting of a material containing portion and a fiber strength reinforcing portion. The superhygroscopic nanofiber nonwoven fabric of claim 2 or 3, wherein the hygroscopic material is a deliquescent salt material. The method according to claim 4, wherein the deliquescent salt material is lithium chloride (LiCl), calcium chloride (CaCl ₂ ), magnesium chloride (MgCl ₂ ), zinc chloride (ZnCl ₂ ), lithium bromide (LiBr), potassium chloride (KCl), sodium bromide ( NaBr), potassium bromide (KBr), potassium hydroxide (KOH), sodium hydroxide (NaOH), and sodium sulfate (Na ₂ SO ₄ ) is a super-hygroscopic nanofiber nonwoven fabric, characterized in that at least one selected from the group consisting of. The method according to claim 2 or 3, wherein at least one of the fiber-forming polymer for fixing the hygroscopic material and the fiber-forming polymer for strength reinforcement is polyurethane (PU), polymethyl methacrylate (PMMA), polyvinyl alcohol ( polyvinylalcohol (PVA), polyacrylonitrile (PAN), polyvinylidene fluoride (PVDF), polyimide (PI), polystyrene (PS), nylon (Nylon), polyvinyl Pyrrolidone (polyvinylpyrrolidone, PVP), polyvinyl chloride (PVC), polycarbonate, cellulose acetate, polylatic acid polymer, starch, and chitosan Super hygroscopic nanofiber nonwoven fabric, characterized in that formed of one or two or more polymers selected from the group consisting of. delete The method according to claim 2 or 3, wherein the hygroscopic material is contained in 3 to 70 parts by weight (based on solids) with respect to 100 parts by weight of the fiber-forming polymer solids for fixing the hygroscopic material, the viscosity of the first and second spinning solution Super hygroscopic nanofiber nonwoven fabric, characterized in that 50 ~ 50,000 CPS. Preparing a first spinning solution for forming a hygroscopic material-containing portion comprising a fiber-forming polymer for fixing a hygroscopic material, a hygroscopic material, and a solvent; Preparing a second spinning solution for forming a fiber strength reinforcement part comprising a fiber-forming polymer for strength reinforcement and a solvent; And Super-hygroscopic nanofibers having a hygroscopic material-containing portion and a fiber strength reinforcing portion comprising a nanofiber cross-section including the step of electrospinning the first spinning solution and the second spinning solution through a nozzle having a single injection port and a spinneret formed as one; Method for manufacturing nonwoven fabrics. Preparing a first spinning solution for forming a hygroscopic material-containing portion comprising a fiber-forming polymer for fixing a hygroscopic material, a hygroscopic material, and a solvent; Preparing a second spinning solution for forming a fiber strength reinforcement part comprising a fiber-forming polymer for strength reinforcement and a solvent; And Sheath part forming spinneret injection hole, sheath part spinneret spinneret, core part spinneret injection hole, and core part spinneret spinneret, A sand fiber cross-section comprising a step of electrospinning so that one of the first spinning solution and the second spinning solution to form a sheath portion and the other to form a core portion by using a nozzle installed inside the spinneret forming a spinneret The manufacturing method of the superhygroscopic nanofiber nonwoven fabric which consists of this hygroscopic substance containing part and fiber strength reinforcement part. The method according to claim 9 or 10, wherein the hygroscopic material is contained in 3 to 70 parts by weight (based on solids) with respect to 100 parts by weight of the fiber-forming polymer solids for fixing the hygroscopic material, the viscosity of the first and second spinning solution Method for producing a super hygroscopic nanofiber nonwoven fabric, characterized in that 50 ~ 50,000 CPS.

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