KR20140122005A - The Mathod of Nano fabrics Coating - Google Patents

Abstract

The present invention relates to a method for manufacturing moisture-permeable waterproof fabric including a nanofiber web. When manufacturing moisture-permeable waterproof fabric (A) in which a nanofiber web comprising nanofibers with average diameter of less than or equal to 1,000 nm is laminated on fabric (B) by an adhesive, a first adhesive resin solution is electrically sprayed on the fabric (B) and a nanofiber polymer resin solution is electrically sprayed thereon and is thermally pressurized. The present invention simplifies a manufacturing process by omitting a process of separately spraying an adhesive separately on the fabric (B).

Description

[0001] The present invention relates to a method for manufacturing a nanofiber breathable waterproof fabric,

The present invention relates to a method for producing a pleasant and refreshing sensible coating which does not cause a swelling phenomenon due to moisture such as sweat or rainwater, and more particularly, to a method for manufacturing a moisture permeable and waterproof fabric including a nanofiber web, The present invention relates to a method for producing a breathable and waterproof fabric laminated with a nanofiber web composed of nanofibers having an average diameter of 1,000 nm or less by an adhesive on a single phase. Breathable waterproof fabric can be frequently used in everyday life as cloth that is widely used in mountain climbing clothes, sleeping bag, hats, gloves, outdoor wear, daily wear, training suit, ski suit, golf wear and so on.

In the 1960s and 1970s, the textile industry, which led the industry with low wages, lost its competitiveness due to wage hikes and backward technologies and lack of materials. As a result, the Chinese and Southeast Asian market products, which already have cheap labor, and the high quality European products It was taken away, and it became a downward industry. The government has also promoted the "Millennium Project" in order to revitalize the textile industry in Daegu by administering hundreds of billions of budgets. However, due to limitations of domestic raw materials and materials, mainly hardware

Etc.), small and medium-sized textile companies are experiencing difficulties in developing new products.

[0004] In particular, the development of environmentally friendly materials is urgently required for the fibers that directly contact the skin in the reality that the world is suffering from an unexplained skin disease and many children are suffering from atopy due to the problem of environmental destruction which is getting worse .

Functional outdoor products such as mountaineering products, training, ski suits, golf suits, etc. are required to have breathable waterproof performance. Therefore, the polyurethane coating is applied to the knitted fabric so as to exhibit such characteristics, Permeable waterproof fabric made by laminating porous e-PTFE (PolyTetraFluoro Ethylene) film on the fabric using laminating. However, the moisture-permeable and waterproof fabric produced by the above-described method has a problem that the production process is complicated, the pore distribution is uneven, and the pore density can not be easily controlled. Further, the fabric is excellent in water resistance, but has a disadvantage in that sweat and moisture generated in the body are discharged to deteriorate the ability to maintain a comfortable state. Particularly, e-PTFE has recently become a subject of environmental regulation as a carcinogen. A fabric B (hereinafter referred to as "laminated body ") in which a dot- Quot;) is pressed and heated and bonded to produce a moisture-permeable waterproof fabric including the nanofiber web according to the present invention. The thermal bonding is preferably performed by a method of thermocompression bonding the laminate at 80 to 150 ° C for 3 to 20 seconds using a calender roller or a hot plate. (Polydimethylsiloxane) in an amount of 7% by weight based on the total weight of the solution was added to a solution prepared by dissolving a thermoplastic polyurethane resin having a weight average molecular weight of 200,000 at a concentration of 20% (w / w) Respectively.

 Next, the adhesive resin solution is injected through a metering pump of the electric spray apparatus shown in FIG. 2 through a nozzle 3 having a voltage of 28,000 volts applied thereto to a collector 4 having a voltage of 28,000 volts (V) An adhesive resin in the form of a dot was applied on the nylon fabric (B) by electrospray on the nylon fabric (B) passing through the nylon fabric (B).

Subsequently, the polymer resin solution for producing nanofibers is injected through the metering pump 2 of the electrospinning apparatus shown in Fig. 2 through a nozzle 3 having a voltage of 40,000 volts (V) to a voltage of 40,000 volts (V) Nanofibers having an average diameter of 400 nm are laminated to a thickness of 12 탆 to be 7 g / m < 2 > per unit area, M < 2 > was laminated to produce a nylon fabric (laminate) in which a fibrous adhesive resin and a nanofiber web (C) were sequentially laminated. Subsequently, the laminate was heated and pressed while passing between heating rollers at 110 占 폚 for 20 seconds to prepare a moisture-permeable and waterproof fabric (A) comprising a nanofiber web.

The present invention can dispense with a separate step of previously applying an adhesive on a fabric in order to laminate the nanofiber web on a fabric when manufacturing a moisture-permeable and waterproof fabric including the nanofiber web, thereby simplifying the manufacturing process and reducing the manufacturing cost A method for manufacturing a breathable waterproof fabric is provided.

In order to achieve the above object, the moisture-permeable and waterproof fabric including the nanofiber web according to the present invention comprises a nanofiber web (C) composed of nanofibers having an average diameter of 1,000 nm or less by laminating on a fabric (B) When the moisture-permeable and waterproof fabric (A) is manufactured, an adhesive resin solution is sprayed on the fabric (B) passing over the collector of the electrospinning device and the adhesive resin is applied in a dot form on the fabric (B) Next, a nanofiber web (C) composed of nanofibers having an average diameter of 1,000 nm or less is laminated by electrospinning a polymer resin solution for producing nanofibers on the fabric (B) coated with an adhesive resin, Characterized in that the fabric (B), in which the fibrous adhesive resin and the nanofiber web (C) are laminated in order, is pressed and heated to be adhered.

 The present invention will be described in detail with reference to the accompanying drawings. First, as shown in FIG. 1, the moisture-permeable and waterproof fabric A according to the present invention has a structure in which a nanofiber web C composed of nanofibers having an average diameter of 1,000 nm or less is laminated on a fabric B by an adhesive . The viscosity of the adhesive resin solution and / or the molecular weight of the adhesive resin solution differ depending on the resin type, but the adhesive aqueous solution maintains a level at which the fiber form can not be formed by electrospinning.

 The electrospinning or electric spraying apparatus used in the present invention is not particularly limited. An electrospinning device using multiple nozzles as shown in FIG. 2 may be used, and other types of electrospinning or electric spraying devices may also be used. The electrospinning or electric spraying apparatus includes a radiating section composed of a metering pump 2 for supplying the adhesive resin solution or the polymer resin solution and a plurality of nozzles 3 and a high voltage generating section by the high voltage generating apparatus 6 And a collector 4 for fixing the nano-fiber or dot-shaped adhesive to be vaporized. The voltage generated during electrospinning can be variously applied considering the concentration of the polymer solution, the amount of the polymer solution supplied through the metering pump, the thickness of the nanofiber to be obtained, and the like, ranging from several thousand to several hundred thousand volts.

The nanofibers are composed of a polyurethane resin, a polyamide resin, polyvinylidene difluoride (PVDF), or a mixed resin thereof.

The present invention can omit the step of applying the adhesive on the fabric, thereby simplifying the manufacturing process and reducing the manufacturing cost. In addition, the present invention includes a nanofiber web as a porous membrane, and is particularly excellent in both the moisture permeability and the water pressure. [4] The present invention also provides a porous membrane comprising a porous membrane It is eco-friendly.

 Therefore, the present invention is useful as a material for manufacturing casual suits, sports suits and the like.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to examples. However, the following examples are illustrative of the present invention, and the scope of protection of the present invention is not limited to the following examples.

 Example 1

 A water-reactive low melting point polyurethane having a weight average molecular weight of 50,000 was dissolved in dimethylformamide at a concentration of 5% (w / w) to prepare an adhesive resin solution.

 On the other hand, a silicone water repellent (polydimethylsiloxane) was added in an amount of 7% by weight based on the total weight of the solution to a solution in which a polyamide resin having a relative viscosity of 2.5 was dissolved in an aqueous solution of formic acid at a concentration of 20% (w / Solution. Next, the adhesive resin solution is injected through a metering pump of the electric spray apparatus shown in FIG. 2 through a nozzle 3 having a voltage of 28,000 volts applied thereto to a collector 4 having a voltage of 28,000 volts (V) An adhesive resin in the form of a dot was applied on the nylon fabric (B) by electrospray on the nylon fabric (B) passing through the nylon fabric (B). Subsequently, the polymer resin solution for producing nanofibers is injected through a metering pump 2 of the electrospinning apparatus shown in Fig. 2 through a nozzle 3 having a voltage of 28,000 volts (V) to a voltage of 28,000 volts Nanofibers having an average diameter of 500 nm were electrospun on a nylon fabric (B) having passed through a collector (4) on which a fibrous adhesive resin had been applied,

And a nano fiber web (C) having a weight per unit area of 7 g / m < 2 > was laminated to produce a nylon fabric (laminate) in which a fibrous adhesive resin and a nanofiber web (C) were sequentially laminated.

 Subsequently, the laminate was heated and pressed while passing between heating rollers heated at 130 캜 for 10 seconds to prepare a moisture-permeable and waterproof fabric (A) comprising a nanofiber web.

The results of evaluating various physical properties of the moisture permeable and waterproof fabric (A) thus produced were as shown in Table 1.

 Example 2

 A thermosetting hot-melt polyurethane having a weight average molecular weight of 50,000 was dissolved in dimethylformamide at a concentration of 15% (w / w) to prepare an adhesive resin solution. (Polydimethylsiloxane) was added in an amount of 7% by weight based on the total weight of the solution to prepare a resin solution for producing nanofibers, in which the difluoride was dissolved in dimethylacetamide at a concentration of 15% (w / w).

 Next, the adhesive resin solution is injected through a metering pump of the electric spray apparatus shown in FIG. 2 through a nozzle 3 having a voltage of 28,000 volts applied thereto to a collector 4 having a voltage of 28,000 volts (V) An adhesive resin in the form of a dot was applied on the polyester fabric (B) by electrospray on the nylon fabric (B) passing through the polyester fabric (B).

 Subsequently, the polymer resin solution for producing nanofibers is injected through a metering pump 2 of the electrospinning apparatus shown in Fig. 2 through a nozzle 3 having a voltage of 20,000 volts (V) to a voltage of 20,000 volts (V) Nanofibers having an average diameter of 700 nm are stacked to a thickness of 20 mu m so as to have a weight per unit area of 9 g (weight) per unit area of the polyester fabric (B) / M < 2 > was laminated to produce a polyester fabric (laminate) in which a fibrous adhesive resin and a nanofiber web (C) were sequentially laminated. Subsequently, the laminate was heated and pressed while passing between heating rollers at 110 占 폚 for 20 seconds to prepare a moisture-permeable and waterproof fabric (A) comprising a nanofiber web. The results of evaluating various physical properties of the moisture permeable and waterproof fabric (A) thus produced were as shown in Table 1.

 The present invention firstly applies an adhesive resin in a dot form onto the fabric B by electrospraying the adhesive resin solution onto the fabric B passing over the collector of the electrospinning device as shown in Fig. Then, a nanofiber web (C) composed of nanofibers having an average diameter of 1,000 nm or less is laminated by electrospinning a polymer resin solution for producing nanofibers on the fabric (B) coated with an adhesive resin. 2 is a schematic view of an apparatus for electrospinning an adhesive resin solution or electrospinning a solution of a polymer resin for producing nanofibers. Electron micrographs of the nanofiber web (C) surface included in the present invention

The manufacturing technology of the breathable and waterproof fabric can be classified into three types: laminating method, dry type and wet type coating method. Breathable waterproof fabric means fabric that allows air and water vapor to pass through but not liquid water.

First, Japanese Patent Laid-Open Publication No. Hei 5-124144 discloses a moisture permeable and waterproof sheet made by bonding a nonwoven fabric composed of a polyethylene porous film and heat-adhesive fibers with heat and pressure, as disclosed in Japanese Patent Application Laid-Open No. 3-213581 Discloses a breathable and waterproof fabric having excellent abrasion resistance, which is produced by laminating a moisture permeable film made of a polyamino acid-based polyurethane containing 0.1% or more of powder composed of a reaction product of L-lysine and an organic acid to a fabric, In the patent document 10-2009-0128106 p. 2-47058, the mixing ratio of the hydrophilic polyamino acid-based urethane and the polyurethane is 10: 0 to 2: 8 and the resin composition made of the isocyanate compound, the hydrophobic organic solvent, the hydrophilic organic solvent, Is applied on a sheet, dried, and laminated with a polyurethane-based adhesive. Other by a conventional laminating method is by laminating the porous film consisting of a fluorine resin onto the fabric by an adhesive known method for producing a moisture-permeable waterproof fabric.

Second, as a technique related to the dry coating method, Japanese Patent Application Laid-Open No. 4-249142 discloses a coating for forming a microporous film on a circular cross section made of an antistatic fiber, a substance having deodorant in the inner layer of the coating resin, Discloses a deodorizing and breathable waterproof fabric having a porosity of 20 to 70%. Japanese Patent Laid-Open Publication No. 4-146275 discloses a method of forming a porous moisture-permeable film made of a fluorine-modified polyurethane resin on a surface of a fiber, Japanese Patent Application Laid-Open No. Hei 7-258971 discloses a method of coating a dyed knit fabric mainly composed of polyester fibers with a cyclic compound in a non-reducing maltooligosaccharide in a coating resin composition And a method of coating a polyester knitted fabric is disclosed.

 As a technique related to the wet coating method, Japanese Patent Laid-Open Publication No. 5-78984 discloses a method of wet coating a polyurethane resin solution containing 1% or more of fine powder having an average particle diameter of 0.1 탆 or less on a fabric, / m 2 / day and 600 g / cm 2

And JP-A-8-13352 discloses a multi-pore water layer having a porosity of 40% or more by coating a polyurethane resin on a raw fabric, and has a deodorizing property of 1.5 탆 or less in the resin layer Permeable waterproof fabric containing 1 to 40% by weight of a fine powder having an average particle size of 1 mm or less.

The conventional techniques described above have disadvantages in that the manufacturing method is complicated and the pores of the film or membrane exhibiting the waterproof and waterproof function are uneven and the moisture permeability is low, that is, the moisture can not pass smoothly. In addition, when an organic solvent is used in the manufacturing process, the dyestuff of the fabric may escape by the organic solvent to cause contamination. In the case of using a porous membrane made of a fluorine resin, . As a method for overcoming this disadvantage, Korean Patent Laid-Open No. 2006-0022406 and the like disclose a nanofiber web composed of fibers (hereinafter referred to as "nanofibers") having an average diameter of 1,000 nm or less by electrospinning, And a method of laminating using a glue on a fabric. However, the conventional method has a complicated manufacturing process because it requires a separate step of applying an adhesive on the fabric in order to laminate the nanofiber web on the fabric. In addition, the nanofiber preferably contains 0.5 to 5.0% by weight of a silicone-based water repellent agent based on the total weight of the nanofiber. If the content of the silicone-based water repellent agent is less than 0.5% by weight, the water repellency of the moisture-permeable and waterproof fabric is deteriorated. If the content is more than 5.0% by weight, The adhesive may be ethylene vinyl acetate, a thermosetting hot-melt polyurethane resin, or a water-reactive polyurethane resin.

 The fabric (B) is preferably a synthetic fiber fabric, and specific examples thereof include a polyamide fabric, a polyester fabric, or a woven fabric thereof. However, the present invention does not specifically limit the kind of the fabric B. The weight per unit area of the nanofiber web C is 5-25 g / m 2, the thickness is 10-50 μm, The nanofiber web C preferably has a weight per unit area of 5 to 6 g / m 2 when the thickness of the nanofiber web C is 10 μm, for example. However, the weight and thickness per unit area of the nanofiber web (C) are not particularly limited in the present invention. Next, a fabric B (hereinafter referred to as a " laminate ") in which a dot-shaped adhesive resin and a nanofiber web C are sequentially stacked as described above is pressed, To produce a breathable waterproof fabric comprising a nanofiber web according to the invention. The thermal bonding is preferably performed by a method of thermocompression bonding the laminate at 80 to 150 ° C for 3 to 20 seconds using a calender roller or a hot plate. The moisture permeable waterproof fabric (A) according to the present invention has a water pressure measured by the ISO 811 method of 5,000 to 15,000 mm H 2 O and a moisture permeability of 5,000 to 15,000 g / m 2 24 hours as measured by the KS K 0594 method, Is preferably 200 to 1,000 g / cm, but the present invention does not specifically limit the water pressure, moisture permeability and peel strength of the moisture permeable and waterproof fabric. A resin solution is prepared.

On the other hand, a solution prepared by dissolving a thermoplastic polyurethane resin having a weight average molecular weight of 200,000 at a concentration of 20% (w / w) was added with a silicone water repellent (polydimethylsiloxane) in an amount of 7 wt% .

 Next, the adhesive resin solution is injected through a metering pump of the electric spray apparatus shown in FIG. 2 through a nozzle 3 having a voltage of 28,000 volts applied thereto to a collector 4 having a voltage of 28,000 volts (V) An adhesive resin in the form of a dot was applied on the nylon fabric (B) by electrospray on the nylon fabric (B) passing through the nylon fabric (B).

Subsequently, the polymer resin solution for producing nanofibers is injected through the metering pump 2 of the electrospinning apparatus shown in Fig. 2 through a nozzle 3 having a voltage of 40,000 volts (V) to a voltage of 40,000 volts (V) Nanofibers having an average diameter of 400 nm are laminated to a thickness of 12 탆 to be 7 g / m < 2 > per unit area, M < 2 > was laminated to produce a nylon fabric (laminate) in which a fibrous adhesive resin and a nanofiber web (C) were sequentially laminated. Subsequently, the laminate was heated and pressed while passing between heating rollers at 110 占 폚 for 20 seconds to prepare a moisture-permeable and waterproof fabric (A) comprising a nanofiber web.

Sectional schematic view of an example of a breathable and waterproof fabric according to the present invention

Claims (2)

In producing a moisture permeable and waterproof fabric (A) laminated with a nanofiber web (C) composed of nanofibers having an average diameter of 1,000 nm or less on the fabric (B) by an adhesive, An adhesive resin solution is sprayed on the fabric B passing through the fabric B to form an adhesive resin on the fabric B in the form of dots and then onto the fabric B coated with the adhesive resin A nanofiber web (C) composed of nanofibers having an average diameter of 1,000 nm or less is laminated by electrospinning a polymer resin solution for producing nanofibers, and then a fiber adhesive resin and a nanofiber web (C) (B) is pressurized and heated so as to be adhered to the surface of the nanofiber web. The method according to claim 1, wherein the adhesive resin is one selected from the group consisting of ethylene vinyl acetate, a thermosetting hot-melt polyurethane resin, and a water-reactive polyurethane resin.

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