KR20090128106A - Method of manufacturing waterproof fabric containing nanofiber web - Google Patents

Abstract

The present invention relates to a method for manufacturing a water-repellent waterproof fabric comprising a nanofiber web, wherein the nanofiber web (C) consisting of nanofibers having an average diameter of 1,000 nm or less by an adhesive on a fabric (B) is laminated When manufacturing the waterproof fabric (A) is first characterized in that the electrospray of the adhesive resin solution on the fabric (B), and then electrospun the nanofiber polymer resin solution thereon and then thermocompression.

  The present invention can omit the process of separately applying the adhesive on the fabric (B), there is an effect that the manufacturing process is simplified.

Description

Method of manufacturing waterproof fabric containing nanofiber web {Method of manufacturing water-proof and moisture-permeable fabric comprising nano fiber web}

The present invention relates to a method for manufacturing a water-repellent waterproof fabric comprising a nanofiber web, more specifically, the nanofiber web (C) consisting of nanofibers having an average diameter of 1,000 nm or less by an adhesive on the fabric (B) is It relates to a method for producing a laminated moisture permeable waterproof fabric (A).

Hereinafter, in the present invention, the fabric provided with moisture-permeable waterproof is called water-permeable waterproof fabric.

The breathable waterproof fabric is a fabric that is widely used in climbing clothes, sleeping bags, hats, gloves, outdoor clothing, training clothes, ski clothes, golf wear, etc.

Looking at the manufacturing technology of the waterproof breathable fabric can be divided into three types, it is divided into laminating method, dry and wet coating method. Water-permeable waterproof fabric refers to a fabric that allows air and steam to pass through, but does not pass liquid water.

First, the prior art of the laminating method is described in Japanese Patent Laid-Open No. 5-124144, a moisture-permeable waterproof sheet manufactured by joining a nonwoven fabric composed of a polyethylene porous film and a heat-adhesive fiber with heat and pressure, and Japanese Patent Laid-Open No. 3-213581. This article describes a wear-resistant waterproof fabric made by laminating a moisture-permeable film made of a polyamino acid-based polyurethane containing 0.1% or more of a powder of L-lysine and an organic acid on a fabric. 47058 has a mixture ratio of hydrophilized polyamino acid urethane and polyurethane from 10: 0 to 2: 8, and a resin composition made of an isocyanate compound, a hydrophobic organic solvent, a hydrophilic organic solvent, and water on a sheet, dried, and then A moisture-permeable waterproof fabric prepared by laminating with an adhesive is described.

Another conventional laminating method is also known a method for producing a moisture-proof waterproof fabric by laminating a porous film composed of a fluorine-based resin with an adhesive on a fabric.

Secondly, as a technique for the dry coating method, Japanese Patent Laid-Open No. 4-249142 provides a coating for forming a microporous coating on a fabric surface made of antistatic fibers, and an inner layer of the coating resin contains a deodorizing substance and a coating film. A deodorant antistatic moistureproof fabric having a porosity of 20 to 70% is described. A moisture-permeable waterproof fabric having a porous moisture-permeable membrane is described. A coating method of a polyester based knitted fabric is described.

Third, as a technique for the wet coating method, Japanese Patent Laid-Open No. 5-78984 is manufactured by wet coating a polyurethane resin solution containing 1% or more of fine powder having an average particle diameter of 0.1 μm or less on the fabric by wet coating. A moisture-permeable waterproof fabric having a moisture permeability of more than / m ² / day and a water resistance of 600 g / cm ² or more is described, and Japanese Patent Application Laid-open No. Hei 8-13352 has a porous resin layer having a porosity of 40% or more by coating a polyurethane resin on the fabric, In the resin layer, a moisture-permeable waterproof fabric containing 1 to 40% by weight of fine powder having an odor of 1.5 μm or less is described.

The above-described conventional techniques have a disadvantage in that the manufacturing method is complicated and the pores of the film or membrane exhibiting the moisture-permeable waterproof function are non-uniform and low moisture permeability, that is, moisture does not pass smoothly. In addition, in the case of using the organic solvent in the manufacturing process, the dye of the fabric may be released by the organic solvent to cause contamination.

In addition, there is a problem of environmental pollution when using a porous membrane composed of a fluorine-based resin.

As a method for overcoming these shortcomings, Korean Patent Publication No. 2006-0022406 et al. Prepared a nanofiber web composed of fibers having an average diameter of 1,000 nm or less (hereinafter referred to as "nanofiber") by electrospinning, and then A method of laminating using an adhesive on a fabric is disclosed.

However, the conventional method has a complicated problem in that the manufacturing process has to go through a separate process of applying an adhesive on the fabric in order to laminate the nanofiber web on the fabric.

The present invention can omit the separate process of applying an adhesive on the fabric in advance in order to laminate the nanofiber web on the fabric when manufacturing the water-permeable waterproof fabric comprising the nanofiber web, the manufacturing process is simple, and the manufacturing cost is low Provided is a method for manufacturing a waterproof waterproof fabric.

The waterproof fabric containing the nanofiber web of the present invention for achieving the above problem is that the nanofiber web (C) consisting of nanofibers having an average diameter of 1,000 nm or less by an adhesive on the fabric (B) is laminated When manufacturing the moisture-permeable waterproof fabric (A), the adhesive resin solution is electrosprayed on the fabric (B) passing through the collector (4) of the electrospinning apparatus to form an adhesive resin on the fabric (B) Then, the nanofiber web (C) consisting of nanofibers having an average diameter of 1,000 nm or less was laminated by electrospinning the polymer resin solution for producing nanofibers on the fabric (B) to which the adhesive resin was applied. Then, the raw material (B) in which the fibrous adhesive resin and the nanofiber web (C) are sequentially laminated is pressed and heated to bond.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

First, the moisture-permeable 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 on a fabric (B) is laminated by an adhesive. Has

1 is a schematic cross-sectional view of a moisture-permeable waterproof fabric (A) according to the present invention.

The present invention first sprays the adhesive resin solution on the fabric (B) by electrospraying the adhesive resin solution on the fabric (B) passing through the collector (4) of the electrospinning apparatus as shown in FIG. After coating in the form, the nanofiber web (C) consisting of nanofibers having an average diameter of 1,000 nm or less is laminated by electrospinning the polymer resin solution for producing nanofibers on the fabric (B) to which the adhesive resin is applied. .

2 is a schematic diagram of an apparatus for electrospraying an adhesive resin solution or electrospinning a polymer resin solution for producing nanofibers.

The viscosity of the adhesive resin solution and / or the molecular weight of the adhesive resin solution is different depending on the type of resin, but the adhesive resin solution to maintain a level that can not form a fiber form by electrospinning.

It does not specifically limit to the electrospinning or electrospray apparatus used by this invention. An electrospinning apparatus using multiple nozzles as shown in FIG. 2 may be used, and other types of electrospinning or electrospray apparatuses may also be used. The electrospinning or electrospraying device comprises a spinning unit consisting of a metering pump 2 and a plurality of nozzles 3 for supplying the adhesive resin solution or the polymer resin solution, and a high voltage generating unit and spinning by the high voltage generator 6. And a collector 4 for fixing the nanofibers or dots in the form of volatilized adhesive. The generated voltage during electrospinning can be variously applied in consideration of the concentration of the polymer solution at several thousand to several hundred thousand volts, the amount of the polymer solution supplied through the metering pump, and the thickness of the nanofibers to be obtained.

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

In addition, the nanofibers preferably contain 0.5 to 5.0% by weight of the silicone-based water repellent relative to the total weight.

When the content of the silicone-based water repellent is less than 0.5% by weight, the water repellency of the moisture-permeable waterproofing fabric is lowered, and when it exceeds 5.0% by weight, radioactivity may be lowered.

The adhesive is ethylene vinyl acetate, a thermosetting hot-melt polyurethane resin or a moisture reactive polyurethane resin.

It is preferable that the fabric (B) is a synthetic fiber fabric, and specific examples thereof are polyamide fabric, polyester fabric, or the like.

However, in the present invention, the type of the fabric (B) is not particularly limited.

The weight per unit area of the nanofiber web (C) is 5 ~ 25g / ㎡, the thickness is 10 ~ 50㎛ is preferred to evenly satisfy the desired water pressure resistance, moisture permeability and light weight.

The nanofiber web (C), for example, when the thickness is 10㎛ more preferably the weight per unit area is 5 ~ 6g / ㎡ level.

However, the present invention does not specifically limit the weight and thickness per unit area of the nanofiber web (C).

Next, as described above, the fabric B (hereinafter referred to as "laminated body"), in which the adhesive resin in the form of dots (dots) and the nanofiber web C are sequentially laminated, is pressurized and heat-bonded. To prepare a waterproof waterproof fabric comprising a nanofiber web according to.

The thermal bonding is preferably carried out by a method of thermally compressing the laminate at 80 to 150 ° C. for 3 to 20 seconds using a calendar roller or a hot plate.

According to the present invention, the water-permeable waterproof fabric (A) has a water pressure of 5,000 to 15,000 mm H ₂ O measured by the ISO 811 method, and a water vapor transmission rate of 5,000 to 15,000 g / m 2/24 hours measured by the KS K 0594 method, ASTM D. The peel strength measured by the method 2724 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 waterproof fabric.

The present invention can omit the step of applying the adhesive on the fabric, the manufacturing process is simplified, the manufacturing cost is low.

In addition, the present invention includes a nanofiber web as a porous membrane, and is particularly excellent in moisture permeability and water pressure at the same time.

In addition, the present invention does not include a porous membrane that is a fluorine-based resin is environmentally friendly.

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

Hereinafter, the present invention will be described in detail through examples.

However, the following examples show one example of the present invention, and the protection scope of the present invention is not limited only to the following examples.

Example  One

An adhesive resin solution was prepared by dissolving a water-responsive low melting point polyurethane having a weight average molecular weight of 50,000 at a concentration of 5% (w / w) in dimethylformamide.

On the other hand, in a solution in which a polyamide resin having a relative viscosity of 2.5 was dissolved in an aqueous formic acid solution at a concentration of 20% (w / w), a silicone-based water repellent (polydimethylsiloxane) was added to the total weight of the solution by 7% by weight of the resin for manufacturing nanofibers. The solution was prepared.

Next, the collector 4 having a voltage of 28,000 volts V is applied to the adhesive resin solution through a nozzle 3 having a voltage of 28,000 volts V through a metering pump of the electric spray device shown in FIG. 2. The adhesive resin in the form of dots was applied onto the nylon fabric B by electric spraying on the nylon fabric B passing through the phase.

Subsequently, the polymer resin solution for producing nanofibers was subjected to 28,000 volts (V) through a nozzle 3 having a voltage of 28,000 volts (V) through a metering pump (2) of the electrospinning apparatus shown in FIG. The nanofibers with an average diameter of 500 nm were laminated to a thickness of 15 μm by electrospinning on a nylon fabric (B) coated with a fibrous adhesive resin and passing through a collector (4) under voltage and weighing 7 g per unit area. The nanofiber web (C) of / m 2 was laminated to prepare 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 through a heating roller at 130 ° C. for 10 seconds to prepare a moisture-permeable waterproof fabric (A) including a nanofiber web.

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

Example  2

An adhesive resin solution was prepared by dissolving a thermosetting hot-melt polyurethane having a weight average molecular weight of 50,000 at a concentration of 15% (w / w) in dimethylformamide.

On the other hand, in a solution in which polyvinylidene difluoride having a weight average molecular weight of 520,000 was dissolved in dimethylacetamide at a concentration of 15% (w / w), a silicone-based water repellent (polydimethylsiloxane) was added to 7% by weight of the total weight of the solution. To prepare a resin solution for preparing nanofibers.

Next, the collector 4 having a voltage of 28,000 volts V is applied to the adhesive resin solution through a nozzle 3 having a voltage of 28,000 volts V through a metering pump of the electric spray device shown in FIG. 2. The adhesive resin in the form of dots was applied on the polyester fabric (B) by electric spraying on the nylon fabric (B) passing through the phase.

Subsequently, the polymer resin solution for manufacturing the nanofibers was subjected to a voltage of 20,000 volts (V) through a nozzle 3 having a voltage of 20,000 volts (V) through a metering pump 2 of the electrospinning apparatus shown in FIG. 2. The nanofibers having an average diameter of 700 nm were laminated to a thickness of 20 μm by electrospinning on the suspended collector 4 and coated with a fibrous adhesive resin. The weight per unit area was 9 g. A polyester web (C) of / m 2 was laminated to prepare 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 through a heating roller at 110 ° C. for 20 seconds to prepare a moisture-permeable waterproof fabric (A) including a nanofiber web.

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

Example  3

Reactive low melting point polyurethane having a weight average molecular weight of 150,000 was dissolved in dimethylformamide at a concentration of 8% (w / w) to prepare an adhesive resin solution.

Meanwhile, a resin solution for producing nanofibers was added to a solution in which a thermoplastic polyurethane resin having a weight average molecular weight of 200,000 was dissolved at a concentration of 20% (w / w) by adding 7% by weight of a silicone-based water repellent (polydimethylsiloxane) to the total weight of the solution. Was prepared.

Next, the collector 4 having a voltage of 28,000 volts V is applied to the adhesive resin solution through a nozzle 3 having a voltage of 28,000 volts V through a metering pump of the electric spray device shown in FIG. 2. The adhesive resin in the form of dots was applied onto the nylon fabric B by electric spraying on the nylon fabric B passing through the phase.

Subsequently, the polymer resin solution for preparing nanofibers was subjected to a voltage of 40,000 volts (V) through a nozzle 3 having a voltage of 40,000 volts (V) through a metering pump 2 of the electrospinning apparatus shown in FIG. 2. The nanofibers having an average diameter of 400 nm were laminated to a thickness of 12 μm by electrospinning on the suspended collector 4 and the nylon fabric B coated with fibrous adhesive resin, and thus the weight per unit area was 7 g /. A nanofiber web (C) of 2 m 2 was laminated to prepare a nylon fabric (laminate) in which a fibrous adhesive resin and a nanofiber web (C) were sequentially stacked.

Subsequently, the laminate was heated and pressed while passing through a heating roller at 110 ° C. for 20 seconds to prepare a moisture-permeable waterproof fabric (A) including a nanofiber web.

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

Property evaluation result of waterproof breathable fabric division Example 1 Example 2 Example 3 Water pressure (mm H ₂ O) 1,200 12,500 13,000 Water vapor permeability (g / ㎡ ・ 24 hours) 8,300 7,800 7,000 Peel Strength (g / ㎠) 500 530 560

1 is a schematic cross-sectional view of an example of a moisture-permeable waterproof fabric according to the present invention.

Figure 2 is a schematic diagram of an electrospinning apparatus for electrospinning the adhesive resin solution and the polymer resin solution for producing nanofibers in the present invention.

Figure 3 is an electron micrograph of the surface of the nanofiber web (C) included in the present invention.

* Code description for main parts of the drawings

A: breathable waterproof fabric B: fabric

C: Nanofiber web D: Bonding part

1: spinning liquid main tank 2: metering pump

3: nozzle 4: collector

5: voltage transfer rod 6: voltage generator

Claims (5)

In manufacturing a moisture-permeable waterproof fabric (A) in which a nanofiber web (C) composed of nanofibers having an average diameter of 1,000 nm or less by an adhesive on a fabric (B) is laminated, on the collector (4) of the electrospinning apparatus. The adhesive resin solution was electrosprayed onto the fabric B passing through the coating, and the adhesive resin was applied in the form of dots on the fabric B, and then on the fabric B coated with the adhesive resin. Electrospinning the polymer resin solution for manufacturing nanofibers to laminate a nanofiber web (C) consisting of nanofibers having an average diameter of 1,000 nm or less, and then the fibrous adhesive resin and the nanofiber web (C) in turn laminated Method for producing a water-repellent waterproof fabric comprising a nanofiber web, characterized in that (B) by pressing, heating and bonding. The method of claim 1, wherein the adhesive resin is one selected from ethylene vinyl acetate, a thermosetting hot-melt polyurethane resin, and a water-reactive polyurethane resin. The method of claim 1, wherein the nanofibers are made of at least one resin selected from polyurethane resins, polyamide resins, and polyvinylidene difluoride resins. . The method of claim 1, wherein the thermocompression bonding is performed for 30 to 20 seconds at a temperature of 80 to 150 ° C. 6. The method of claim 1, wherein the thermocompression bonding is performed using one selected from a calendar roller and a hot-plate.

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