KR101319540B1 - Method for manufacturing vapor-permeable and waterproof sheet - Google Patents

Abstract

PURPOSE: A production method of a breathable waterproof fabric is provided to have excellent water repellency through prevention of a capillary phenomenon or slipping over between laminated fabrics and to have comfortable sensation. CONSTITUTION: A production method of a breathable waterproof fabric includes the following steps. A nano-fiber web layer with thickness of 2-50 micro meters is formed laminating nano fibers with a size of 50-1000 nano meters. A mixed solution, in which a good solvent which melts nano fibers and a non solvent or a vacant solvent are mixed to form a bonding between the nano fibers at least after completion of laminating the nano fibers, is supplied to the nano fiber web layer. The nano fiber web layer in which the mixed solution is supplied is dried applying heat.

Description

METHOD FOR MANUFACTURING VAPOR-PERMEABLE AND WATERPROOF SHEET}

The present disclosure relates generally to a method for manufacturing a moisture-permeable waterproof fabric, and more particularly, to a method for manufacturing a water-permeable waterproof fabric having a web layer formed from nanofibers.

Herein, the background art relating to the present disclosure is provided, and these are not necessarily meant to be known arts.

A web layer made of nanofibers is considered as a moisture-proof and moisture-proof fabric. Such nanofiber web layers may be prepared by electrospinning or electroblow-spinning. However, the conventional moisture permeable and waterproof fabric manufactured using such a technology can not obtain sufficient waterproof performance due to the water penetration due to the capillary phenomenon even if the pore size is small, and there is also a disadvantage that the strength is weak. In addition, when the force is applied, there is a disadvantage in that the pores are opened due to the occurrence of slip between the fibers and the waterproofness is lowered, and the waterproofness may also be reduced by the pinhole inevitably generated in the spinning process.

In order to solve the above problems, a breathable and waterproof fabric made by coating a thin PU or PVdF layer on the surface of a nanofiber web layer has been produced. Korean Patent Registration No. 10-0993943 discloses a technique of manufacturing a moisture permeable and waterproof fabric having improved waterproofness and durability by partially coating a water dispersed polyurethane (PUD) on an electrospun nanofiber web layer. However, this technology has the disadvantage of reducing the moisture permeability by blocking the pores which are the most important feature of the fabric made of the nanofiber web layer, the lightness of the nanofiber is also reduced to reduce the comfort and increase the manufacturing cost through additional coating process There is a problem. Further, when the coating layer is added to the back surface of the nanofiber web layer, there is a disadvantage that the waterproof property of the nanofiber web layer due to the pore and the morphology of the nanofiber web layer is remarkably reduced due to the fibrous structure not intertwined by the physical forces remaining in the nanofiber web layer .

Fig. 1 shows an example of an electrospinning device. The electrospinning device 40 includes a supply unit 110 for supplying a polymer material for a fiber material in a molten state, a polymer solution supplied from the supply unit 110 A plurality of spinning nozzles 122 for discharging filaments from the spinning unit 120 in the form of charged filaments or fibers and spinning nozzles 122 for accumulating the filaments emitted from the spinning unit 120 to a predetermined thickness, A control unit 140 installed at least on both sides of the radiation unit 120 and a control unit 140 installed between the control unit 140 and the collector 130 so as to surround the filament stream, And an air conditioning unit 160 for injecting air into a space between the radiation unit 120 and the collector 130, and evaporating the solvent in the space to discharge the air to the outside. The supply unit 110 is a storage container 112 for storing a solution in which a polymer material as a fiber raw material is dissolved, and a pump 114 for pressurizing and supplying the solution stored in the storage container 112 to the spinning unit 120. ) And a distributor 116 and a delivery tube 118 for dispensing the solution to the respective nozzles. The spinning unit 120 performs a function of spinning in the direction of the collector 130 in the form of fine filaments in a state in which the fiber raw material solution supplied from the supply unit 110 is charged. The radiation unit 120 has at least one radiation nozzle pack 126 in which a plurality of radiation nozzles 122 are disposed. The number of the spinning nozzles 122 constituting the spinning nozzle pack 126 or the number of the spinning nozzle packs 126 constituting the spinning unit 120 is determined in consideration of the size, . When a plurality of polymer materials are emitted, a separate spinning nozzle pack may be provided. The collector 130 may be grounded to have a potential difference with respect to a voltage applied to the radiation unit 120, or may be applied with a negative voltage. The collector 130 is for accumulating the charged filaments discharged from the spinning unit 120, and may be configured to continuously move in a conveyor belt manner through a transfer means such as a roller 132, for example. The control unit 140 is for preventing a case in which the filament stream radiated from each of the spinning nozzles 122 rebounds from each other and spreads out from the path, and the control unit 140 includes at least a portion of the spinning nozzle pack 126. It is provided on both sides of the longitudinal direction. Induction unit 150 is applied with a voltage of the same polarity as the control unit 140. The induction unit 150 is installed around the elongated charged filament stream to guide the traveling direction of the stream. Induction unit 150 is provided in the form of a conductor plate or a conductor rod. The induction unit 150 is charged with the same polarity as the charged filament to induce the filament to be integrated in a limited area of the upper surface of the collector 130. The air conditioning unit 160 is to volatilize the solvent dissolved in the charged filament in the space between the spinning unit 120 and the collector 130 to exhaust it to the outside, for example, to absorb the solvent such as a suction fan and an exhaust fan. , Exhaust means and a plurality of air inlet slots 162. The positive voltage is excited by the output voltage of the high voltage unit 170. The high voltage unit 170 outputs a DC voltage in the range of 10 kV to 120 kV. When the raw material solution stored in the supply unit 110 is quantitatively supplied to the spinning unit 120 through the pump 114 and the distributor 116, the energization unit inside each spinning nozzle pack 126 of the spinning unit 120 is provided. The solution is charged. Subsequently, the charged solution is discharged toward the collector 130 in the form of fine filaments while passing through the capillary tube of the spinning nozzle 122. Here, the filaments are radiated while being stretched to a nanoscale diameter by a strong electric field formed between the collector 130 and the charged filaments. In this spinning process, due to the repulsive force between the filaments, the stream to be spread out of the traveling path to the outside is returned to the original position by the control unit 140 to maintain the correct traveling path. On the other hand, the induction unit 150 is installed above the collector 130 to surround the discharged stream, so that the stream which is about to go out of the path by the induction unit 150 is guided to the limited integration region on the collector 130. The filaments derived as described above are continuously integrated on the collector 130 in the form of a conveyor belt or a rotating drum or on the upper surface of the substrate 182 such as a film, a mock paper, or a nonwoven fabric conveyed by the roller 180. Thus, a porous web is formed of nanofibers. An example of such an electrospinning apparatus is shown in US Patent No. 7,351,052.

This will be described later in the Specification for Implementation of the Invention.

SUMMARY OF THE INVENTION Herein, a general summary of the present disclosure is provided, which should not be construed as limiting the scope of the present disclosure. of its features).

According to one aspect of the present disclosure (According to one aspect of the present disclosure), in the method of manufacturing a moisture-permeable waterproof fabric, by laminating nanofibers of 50 ~ 1,000nm, to form a nanofiber web layer of 2 ~ 50um thickness Doing; After the lamination of the nanofibers is completed, a mixed solution containing a good solvent for melting the nanofibers and a nonsolvent or a poor solvent in which the nanofibers are relatively difficult to melt is formed to form a bonding between the nanofibers to the nanofiber web layer. Doing; And, by applying heat to the nanofiber web layer supplied with the mixed solution and dried; there is provided a method for producing a moisture-permeable waterproof fabric comprising a.

This will be described later in the Specification for Implementation of the Invention.

1 is a view showing an example of an electrospinning device,
2 is a view showing an example of an electrospinning device according to the present disclosure,
3 is a table showing the measurement results of waterproofness and moisture permeability;
Figure 4 is an electron microscope (SEM) photograph of the surface before the post-treatment of the nanofiber web layer prepared according to Example 1,
5 is an electron micrograph (SEM) photograph of the surface of the nanofiber web layer post-treated according to Example 2,
6 is an electron micrograph (SEM) photograph of the surface of the nanofiber web layer post-treated according to Example 3.

The present disclosure will now be described in detail with reference to the accompanying drawing (s).

Water-permeable waterproof fabric is composed of nanofibers with an average diameter of 50-1,000 nm. Webs composed of fiber diameters exceeding 1,000 nm have a pore size that is too large to function as a breathable and waterproof fabric, and water pressure characteristics may be deteriorated. Further, if the fiber diameter is smaller than 50 nm, the pore size becomes too small. In the moisture-permeable and waterproof fabric formed by the nanofibers having such a numerical range, there are a myriad of numerous pores having a diameter of 0.01 to 2 μm, preferably in the range of 0.05 to 1 um. If the pore diameter is less than 0.05um, ventilation and moisture permeability will be deteriorated. If sweating occurs momentarily due to heavy exercise, sweat discharge function will be shortened in a short time. If pore diameter is bigger than 1um, Decrease water pressure function. As a result, the breathable and waterproof fabric passes through the sweat and moisture of 0.0004 μm in diameter generated by the human body and blocks the moisture particles such as fog and raindrops of 50 to 600 μm in diameter generated in the natural state and provides both the waterproof function and the waterproof function . The total porosity is preferably 50 to 90% in consideration of the moisture permeable and waterproof function, warmth and light weight. The porosity of 50% or less has a low air permeability, resulting in poor comfort and light weight, which are advantages of nanofibers. In order to compensate for this, the thickness must be thinned, which causes bad influence on the water pressure. In addition, when the porosity is lowered, the inner air layer is reduced, and when the air layer which prevents the heat loss from being caused by the temperature difference between inside and outside is decreased, The porosity of 90% or more has poor mechanical strength, poor workability, low water pressure, and high aeration rate, resulting in poor thermal insulation. The thickness of the moisture-permeable and waterproof fabric is determined by the lamination amount of the fibers. The thickness of the moisture-permeable and waterproof fabric is suitably about 2 to 50 μm in consideration of the moisture permeability and the water pressure resistance, but more preferably 5 to 30 μm. If the overall thickness of the breathable and waterproof fabric is too thin, waterproofness can not be guaranteed, the mechanical strength is weakened, and the tearing is accompanied by the problem. When the thickness is more than 50um thick, the manufacturing cost increases sharply and the fabric weight per unit area increases It is disadvantageous in weight reduction.

The nanofiber web layer manufactured as described above has a problem of being vulnerable to water resistance due to the slippage between the fibers at high pressure water pressure despite the small pore size, high porosity, and the three-dimensional network structure. There is a problem that the water repellency is lowered than the initial stage due to the opening or fiber entanglement. Therefore, by increasing the bonding strength between the fiber and the fiber surface to increase the durability of the nanofiber web layer or the moisture-permeable moisture-proof fabric to improve the water repellency, water resistance, washing resistance while applying the post-treatment process to maintain the advantages of moisture permeability, light weight, comfort. The post-treatment process induces the bond between the islands by solution impregnation or solution injection of the nanofiber web layer, thereby producing a moisture-permeable waterproof fabric made of nanofiber web of better performance.

In general, a high molecular material used as a raw material of the fibers forming the moisture-permeable waterproof fabric is polyurethane (PU), TPU (Thermoplastic polyurethane), or a mixture of two or more components including them. Urethane has high friction between the fibers and surface adhesion, so that the connection force is formed between the fiber strands, but the sliding force is generated between the fiber strands due to the strong force. In addition, after washing, deformation of the fibers becomes more severe, which causes non-uniformity of the pores and causes the water pressure to drop significantly. For this reason, the problems of nanofiber webs formed of materials without surface friction or adhesion are more serious, and it is impossible to apply a moisture-permeable fabric to nanofiber webs. It alleviates the benefits of other materials. Particularly, the fluororesin is suitable for the waterproofing and waterproofing material because of its excellent water repellency and ductility. However, the fluororesin made from the nanofiber web has no binding force between the fibers and slip between the fibers. According to the present disclosure, it is possible to solve such a problem and to take advantage of the material advantages. In addition to polyurethane, materials that can be used for nanofibers include fluorine-based polymers such as polyvinylidene fluoride (PVdF), polyvinylidene fluoride-hexafluoropropylene copolymer (PVdF-HFP), and amides such as nylon. Polymer, acrylic polymer such as polyacrylonitrile (PAN), sulfon polymer such as poly ehtersulfone, polyester polymer such as polyethylene terephthalate (PET), polyvinyl alcohol (PVA), etc. Any polymer that can be dissolved in the solvent or capable of electrospinning can be used.

2 is a view showing an example of the electrospinning apparatus according to the present disclosure, the polymer solution transferred from the storage container 112 to the pump 114 is made to spin in the spinning nozzles 122, the collector 130 Stacked in the nanofiber web layer is manufactured, wherein the spray nozzles 122, the stopper and the distal end of the solution injector 60 is installed. The solution injector 60 is preferably spray sprayed or electrosprayed. The solution is transferred from the solution tank 50 to the solution injector 60, and the treatment effect varies depending on the mixing ratio and the injection amount of the solution. The solvent is determined according to the raw material of the nanofibers. For example, when polyurethane is used as the raw material of the nanofibers, the good solvents are dimethylacetamide (DMAc, Dimethylacetamide), dimethylformamide (DMF, N, N-dimethylformamide) and acetone ( Acetone), methyl ethyl ketone, toluene, etc. are used, and isopropyl alcohol (IPA, Iso-propyl alcohol), ethyl alcohol (Ethyl alcohol), Methyl alcohol, water, etc. are used. The mixing ratio of the solution is preferably 1 to 50% of a good solvent and 50 to 99% of a nonsolvent, and more preferably 1 to 40% of a good solvent and 60 to 99% of a nonsolvent. The injection amount of the solution is not specified because the amount of injection varies depending on the injection device. The proportion of the mixed solution used in the solution injection is generally good in a good solvent content compared to the impregnation method described later. This is particularly the case with electrospraying, as the solution evaporates rapidly during the spraying process, and the non-solvents in the mixed solution generally have a lower boiling point, resulting in faster evaporation.

In some cases, a solution impregnation method may be used instead of the solution injector 60. The nanofiber web layer transferred from the collector 130 is transferred to the impregnation tank 70, and the treatment effect varies depending on the solution mixing ratio and the impregnation time. The solution mixing ratio is preferably 1% to 40% nonsolvent 60% to 99% solvent, more preferably 80% to 98% solvent 2% to 20% nonsolvent. The impregnation time is preferably 1 to 30 seconds, more preferably 2 to 15 seconds. If the impregnation time is too long, the water permeability may be lowered due to excessive dissolution of the nanofibers, and the weight reduction characteristics of the nanofiber web layer may not be exhibited. Preferably, the nanofiber web layer transferred from the impregnation tank 70 passes between squeezing rolls 80. At this time, the solution contained in the nanofiber web layer is quickly and uniformly diffused inside and outside by the squeegee roll 80, so that it is easy to maintain the evenness of the moisture-permeable waterproof fabric, so that the excessive dissolution effect of the nanofiber web layer can be properly controlled. It is possible to manufacture a fabric having a uniform quality. The nanofiber web layer passing through the squeegee roll 80 is then directed to the drying section 90. The drying unit 90 is characterized in that the nanofiber web layer such as polyurethane (PU), polyvinylidene fluoride (PVdF) or polyvinylidene fluoride-hexafluoropropylene copolymer (PVdF-HFP) shrinks by solvent. It is desirable to use a belt calendar to supplement. The nano-fiber web layer passing through the dryer 90 is dried in a state where the shape is fixed by both belts of the dryer 90. The drying effect and the form stability ensuring effect vary depending on the pressure and the temperature between the both belts when passing through the dryer (90). When a force or heat is applied to the nanofiber web layer, the fabric is deformed in that state, and the deformation of the fabric is not easily predicted due to the contraction occurring in the fabric itself. As a result of this deformation, wrinkles occur in the fabric, This tearing phenomenon occurs. In order to solve such a problem, a dryer 90, preferably a belt calender, is used, and such a problem can be solved by securing the form stability through a belt calender. The pressure between the belts is preferably 0.5 to 10 kgf / cm ² , more preferably 1 to 5 kgf / cm ² . If the belt pressure is low, the fixation effect of the nanofiber web layer is small and the shape stability can not be maintained. If the pressure is too high, the porosity of the nanofiber web layer is decreased and the moisture permeability is deteriorated. The temperature between the belts is preferably 50 to 150 ° C, more preferably 80 to 110 ° C. If the temperature between the belts is low, drying is not perfect. If the temperature is too high, the nanofibers can melt.

Hereinafter, the present invention will be described in detail through examples. However, the present disclosure is not limited only to the examples.

Example  One.

Nanofiber Web layer  Produce

A thermoplastic polyurethane resin (TPU) was mixed with a mixed solvent of N, N-dimethylmethylformamide (DMF) and acetone (Acetone) in a weight ratio of 50:50 to prepare a spinning solution having a concentration of 15 wt%. The prepared spinning solution was measured using a rheometer (Rheometer DV, Brookfield co., USA) with a viscosity of 300 centipoise (cps) and a conductivity meter (CM-40G, TOA electronicsCo., Japan ) Is 0.52 mS / m. This spinning solution was put into a storage container 112 of the electrospinning apparatus shown in Fig. 2 to produce nanofibers as shown in Fig.

Nanofiber Web layer  After treatment

In the present embodiment, the post-treatment was performed by the impregnation method, and in order to prepare a mixed solution, the solvent / non-solvent weight ratio was 5/95 using acetone as a good solvent and isopropyl alcohol (IPA) as a nonsolvent. Prepared and added to the impregnation tank 70, the temperature of the impregnation tank 70 was set to 25 ℃, the impregnation time was set to 10 seconds, the nanofiber web layer passing through the impregnation tank 70 is kept in shape, so as to dry The drying process was performed through the dryer 90 of the belt calender, and the pressure was set to 1.5 kgf / cm <2> and the temperature to 90 degreeC.

Example  2.

A nanofiber web layer was prepared in the same manner as in Example 1, and the post-treatment was performed in the same manner as in Example 1. The ratio of both solvent acetone and nonpolymer IPA used was 10/90 weight ratio.

Example  3.

The nanofiber web layer was prepared in the same manner as in Example 1, and the post-treatment was performed in the same manner as in Example 1. The ratio of the good solvent acetone used and the non-solvent IPA was prepared at a weight ratio of 20/80.

At this time, the impregnation conditions should be a condition that the inter-fiber bonding is formed so that the nanofibers are not completely dissolved.

Figure 4 is an electron micrograph (SEM) of the surface before the post-treatment of the nanofiber web layer prepared according to Example 1, the shape of the network structure web integrated with nanofibers of 200 ~ 400nm diameter was confirmed and this web After the post-treatment by the method of 2 was confirmed in FIG. The surface of the nanofibers was remelted to form a bonding with neighboring fibers, thereby confirming the desired bonding structure, and the nanofibers prepared according to Example 3, in which the good solvent content was higher, were not completely dissolved, and some fiber forms remained. It can be seen in Figure 6 that the pores remain.

Figure 3 shows the analysis results of the sample impregnated in the mixed solution by the nanofiber web layer and Examples 1, 2, 3 before the post-treatment. The water permeability was measured by the KS K 0594: 2008 Calcium Chloride Test Method. The internal water content was measured by KSK ISO 811: 2009 and the air permeability was measured by applying a 1-10 PSI air pressure to the nanofiber web layer with a Capillary Flow Porometer (PMI) Gas permeability method. Samples of Examples 2 and 3 in which the solution impregnation process was performed, some pores were clogged and small, and the moisture permeability and air permeability were reduced, whereas the increase in the water pressure was confirmed as a result of the inter-fiber bonding. In the case of Example 3, the melting of the fiber was so advanced that the water pressure increased a lot, but the moisture permeability and the air permeability were also decreased, thereby weakening the advantages of the nanofibers. On the other hand, in the case of Example 2, when the water pressure increased by 73.7%, the decrease in moisture permeability was 7.4%, and the suitability was confirmed as the waterproof fabric.

Various embodiments of the present disclosure will be described below.

(1) a method of manufacturing a moisture-permeable waterproof fabric, comprising the steps of: laminating nanofibers having a thickness of 50 to 1,000 nm to form a nanofiber web layer having a thickness of 2 to 50 um; After the lamination of the nanofibers is completed, a mixed solution containing a good solvent for melting the nanofibers and a nonsolvent or a poor solvent in which the nanofibers are relatively difficult to melt is formed to form a bonding between the nanofibers to the nanofiber web layer. Doing; And drying the heat by applying heat to the nanofiber web layer supplied with the mixed solution. 2.

(2) prior to drying, pressurizing the mixed solution to spread to the nanofiber web layer; method for producing a moisture-permeable waterproof fabric further comprising.

(3) a method for producing a moisture-permeable waterproof fabric, characterized in that the belt calender is used in the drying step.

(4) a method for producing a moisture-permeable waterproof fabric, characterized in that the squeegee roll is used in the pressing step.

(5) a method for producing a moisture-permeable waterproof fabric, characterized in that the impregnation tank is used in the step of supplying a mixed solution.

(6) a method for producing a moisture-permeable waterproof fabric, characterized in that a solution injector is used in the step of supplying a mixed solution.

(7) A method for producing a moisture-permeable waterproof fabric, wherein a mixed solution is supplied to the nanofiber web layer during and after the nanofiber lamination using a solution injector. As shown in FIG. 2, by using the solution injector 60, the mixed solution may be supplied evenly and downstream of the nanofiber web layer in the flow (arrow direction) of the nanofiber web layer to uniformly supply the mixed solution to the entire nanofiber web layer. Will be.

(8) The method for producing a moisture-permeable waterproof fabric, characterized in that the nanofibers are laminated by electrospinning.

(9) The nanofiber is made of at least one of polyurethane, fluorine-based polymer, amide (amide) -based polymer, acrylic polymer, sulfone-based polymer, polyester-based polymer, polyvinyl alcohol (PVA) How to.

(10) Nanofiber is composed of polyurethane, and good solvents include dimethylacetamide (DMAc, Dimethylacetamide), dimethylformamide (DMF, N, N-dimethylformamide), acetone, and methyl ethyl ketone. , Or toluene is used, and as a poor solvent or non-solvent, isopropyl alcohol (IPA, Iso-propyl alcohol), ethyl alcohol, methyl alcohol or water Method for producing a moisture-permeable waterproof fabric, characterized in that it is used.

According to the method of manufacturing a moisture-permeable waterproof fabric according to the present disclosure, by providing a surface and internal treatment technology using only a pure solvent, not a conventional polyurethane (PU) or polyvinylidene fluoride (PVdF) polymer coating, It simplifies the manufacturing process and reduces the manufacturing cost, and provides comfort and thinner and lighter than the conventional post-treatment nanofiber fabric.

In addition, it is possible to manufacture a nanofiber web of various physical properties by changing the solvent treatment ratio, time, temperature and the like.

According to the method of manufacturing a moisture-permeable waterproof fabric according to the present disclosure, it has excellent waterproofness by preventing capillary phenomenon and preventing slip between laminated fibers, and excellent moisture permeability compared to the conventional moisture-proof waterproof material made of PTFE or PU, It is characterized by having heat retention and comfort. Since each fiber strand is not entangled and properly bonded between fibers like general nanofiber webs or nonwoven fabrics, there is no damage between nanofibers after washing, thus maintaining the initial waterproof property. Less reduction provides the effect of providing a moisture-permeable waterproof fabric made of nanofiber web with excellent comfort.

Storage Containers 112 Pumps 114 Dryers 90

Claims (10)

In the method of manufacturing a moisture-permeable waterproof fabric,
Stacking 50 nm to 1000 nm nanofibers to form a nanofiber web layer having a thickness of 2 μm to 50 μm;
After the lamination of the nanofibers is completed, a mixed solution containing a good solvent for melting the nanofibers and a nonsolvent or a poor solvent in which the nanofibers are relatively difficult to melt is formed to form a bonding between the nanofibers to the nanofiber web layer. Making; And,
Drying by applying heat to the nanofiber web layer supplied with the mixed solution; Method for producing a moisture-permeable waterproof fabric comprising a. The method according to claim 1,
Prior to the drying step, the mixed solution is pressurized to spread to the nanofiber web layer; method for producing a moisture-permeable waterproof fabric further comprising. The method according to claim 1,
Method for producing a moisture-permeable waterproof fabric, characterized in that the belt calender is used in the drying step. The method according to claim 2,
Method of producing a moisture-permeable waterproof fabric, characterized in that the squeegee roll is used in the pressing step. The method according to claim 1,
Method for producing a moisture-permeable waterproof fabric, characterized in that the impregnation tank is used in the step of supplying a mixed solution. The method according to claim 1,
Method for producing a moisture-permeable waterproof fabric, characterized in that the solution injector is used in the step of supplying a mixed solution. The method of claim 6,
Using a solution injector, wherein the mixed solution is supplied to the nanofiber web layer during and after the nanofiber lamination. The method according to claim 1,
Nanofiber is a method for producing a waterproof moisture-permeable fabric, characterized in that laminated through the electrospinning. The method according to claim 1,
Nanofiber is a method for producing a moisture-permeable waterproof fabric, characterized in that made of at least one of polyurethane, fluorine-based polymer, amide (amide) polymer, acrylic polymer, sulfone polymer, polyester polymer, polyvinyl alcohol (PVA). The method according to claim 1,
Nanofiber is made of polyurethane,
As a good solvent, dimethylacetamide (DMAc, Dimethylacetamide), dimethylformamide (DMF, N, N-dimethylformamide) and acetone, methyl ethyl ketone, or toluene are used.
As a poor solvent or non-solvent, isopropyl alcohol (IPA, Iso-propyl alcohol), ethyl alcohol (Ethyl alcohol), methyl alcohol (Methyl alcohol) or water (Water) How to make a fabric.

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