KR20120078329A - Non-woven adhesive tape and preparation method thereof - Google Patents

Abstract

PURPOSE: An unwoven fabric adhesive is provided to maintain strength, to have high elongation, and to obtain enough adhesion, tactility, and moisture permeability and water repellency. CONSTITUTION: A manufacturing method of an unwoven fabric adhesive comprises: a step of preparing thermoplastic polymer spinning polymer material; a step of collecting the spinning polymer material into porous nanofiber web by electrospinning the spinning polymer material; a step of obtaining porous nanofiber unwoven fabric by thermosetting the electro spun nanofiber web by calendaring; a step of spreading an adhesive composition on at least a part of one surface of a nanoweb unwoven fabric substrate, and forming an adhesive layer(20) by forming conjugation by heat-treatment; and a step of laminating a release film(30) on the adhesive layer.

Description

Non-woven Adhesive Tape and Preparation Method

The present invention relates to a nonwoven adhesive tape and a method for manufacturing the same, and more particularly, to a nonwoven adhesive tape including a highly stretchable porous nanoweb nonwoven substrate having excellent elongation and moisture permeability.

In the medical field, adhesive tapes such as surgical tapes and band-aids are frequently used for fixing medical devices, roll bandages, wound protection dressings, and transdermal absorbents to the skin.

Generally, a nonwoven adhesive tape is comprised by coating an adhesive on a base sheet. Such a nonwoven fabric adhesive tape can firmly fix medical equipment, dressing materials, etc. to the skin, and must have proper adhesive force for easy removal, and most of all, it is directly attached to the skin so that it is soft to the touch to avoid damage to normal skin and the body. In order to effectively apply to various parts of the body, it must have good elasticity, and must have both high moisture permeability and waterproofness to prevent water ingress and promote wound healing.

US Pat. No. 4,696,854 discloses a porous bilayer nonwoven substrate of an organic polymer layer and a cured silicone resin layer. The self-winding adhesive tape can be prepared by coating the organic polymer layer with a hydrophilic natural or synthetic pressure-sensitive adhesive. It is also disclosed that such adhesive tapes are useful for medical use because bilayer nonwoven substrates have almost the same porosity as nonwoven materials without the need for a cured silicone resin layer.

However, the nonwoven adhesive tape manufactured by the conventional nonwoven fabric manufacturing technology is inferior in extensibility, and because it is made of coarse fibers, the touch is not good, so it may act as a disadvantage when applied to an important field. In addition, since the porosity is low and the size of the pores is not large to have a water repellent performance, there is a limit that the use is quite limited.

The present invention is to overcome the problems of the prior art as described above, one object of the present invention is to provide a nonwoven adhesive tape excellent in elasticity, touch, and moisture-permeable waterproof.

Another object of the present invention is to provide a method for producing a nonwoven adhesive tape capable of producing a high functional, high elastic nonwoven adhesive tape.

Other objects, advantages and novel features of the invention will become more apparent from the following detailed description and preferred embodiments in conjunction with the accompanying drawings.

One embodiment of the present invention for achieving the above object is a nonwoven adhesive tape comprising a substrate, an adhesive layer and a release film, the substrate is characterized in that it comprises a porous nanoweb nonwoven fabric produced by electrospinning It relates to a nonwoven adhesive tape.

Another embodiment of the present invention for achieving the above object is

Preparing a thermoplastic polymer spun polymer material;

Electrospinning the spun polymer material into a porous nanofiber web; And

Thermally bonding the electrospun nanofiber web by calendering to obtain a porous nanofiber nonwoven fabric;

Applying an adhesive composition to at least a portion of one surface of the nanoweb nonwoven substrate and then bonding by heat treatment to form an adhesive layer;

It relates to a method for manufacturing a nonwoven fabric adhesive tape comprising the step of laminating a release film on the adhesive layer.

The nonwoven adhesive tape of the present invention can be applied for medical purposes because it uses a material that is friendly to the human body. In addition, when applied to the human body it may be applied by using the elasticity of the nonwoven fabric, such as the cuff, elbow, knee and the like. The nonwoven adhesive tape of the present invention can be manufactured in various ways by adjusting the fiber diameter size, thickness, porosity, etc. of the nonwoven fabric according to the application field.

1 is a schematic cross-sectional view of a nonwoven adhesive tape of one embodiment of the present invention.
Figure 2 is a SEM photograph of a nonwoven adhesive tape of one embodiment of the present invention.
3 is a schematic diagram of an electrospinning apparatus that may be used in the method of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted.

As used herein, the term “nanofiber” refers to ultrafine fibers having a diameter of about 100 to about 5,000 nm.

"Non-woven fabric" refers to a fabric made by arranging fibers in parallel or in an opposite direction without going through a weaving process and mechanically processing the fibers to intertwine using heat and resin.

1 is a schematic cross-sectional view of an example of a nonwoven adhesive tape of one embodiment of the present invention. Non-woven adhesive tape of an embodiment of the present invention may be wound in the form of a roll or may be provided in the form of a release film adhered to the adhesive layer surface. As shown in FIG. 1, the nonwoven adhesive tape having a release film has an adhesive layer 20 on at least one surface of the nanoweb nonwoven substrate 10, and has a release film 30 laminated on the adhesive layer.

The nonwoven fabric applied to the nonwoven adhesive tape of the present invention is a stretchable nanoweb nonwoven fabric made of a thermoplastic resin produced by a melt electrospinning technique. The nanoweb nonwoven fabric is characterized by high elasticity, porosity, and moisture permeability while maintaining strength. In addition, the nonwoven adhesive tape of the present invention exhibits a soft touch without surface modification of the nonwoven fabric due to the soft surface of the microfibers, and is free to control fiber diameter and thickness according to the manufacturing conditions, and uses a non-toxic raw material (thermoplastic polymer) and a solvent. It is manufactured through a process that is not used, so the product exhibits human-friendly features.

The nonwoven adhesive tape may be composed of, for example, a porous nanoweb nonwoven fabric 10 produced by electrospinning. The electrospinning is a method of manufacturing a fiber by applying a high voltage to the polymer solution or the molten polymer to form a high voltage electric field between the capillary tip and the collector receiving the web. When the thermoplastic polymer is melted and applied with high voltage and electrospun, a porous nanoweb nonwoven fabric composed of ultrafine fibers is manufactured.

The diameter of the nanofibers constituting the nanofiber nonwoven fabric can be adjusted by appropriately adjusting the type of electrospinning apparatus to be used and conditions during electrospinning. In the present invention, the diameter of the nanofibers may be in the range of 100-5,000 nm, preferably 100-1000 nm, most preferably 100-500 nm.

The nonwoven adhesive tape according to the present invention can control the thickness of the nanofibers and the degree of nanofibers accumulation when the nonwoven fabric is formed to control the thickness of the nonwoven adhesive tape and the pore size of the porous structure. The thickness of the nonwoven adhesive tape is preferably 0.1 to 5 mm, the porosity is 50 to 90% by volume ratio, the pore size is preferably 0.1 to 10 μm, but is not limited thereto. If the thickness of the nanoweb nonwoven substrate 10 is less than 0.1 mm, the elasticity is insufficient or the processing operation is hindered. On the contrary, if the thickness is larger than 5 mm, the flexibility is insufficient.

In the present invention, by applying a voltage to the molten or melted polymer to obtain a porous nanoweb formed of ultrafine fibers through the electrospinning method it is possible to manufacture a highly stretchable nonwoven adhesive tape (sheet) of a multi-layer structure without an adhesive. Nonwoven adhesive tapes can be sterilized, for example gamma sterilized, where necessary, the inner part touching the skin.

Since the nanoweb nonwoven substrate constituting the nonwoven adhesive tape of one embodiment of the present invention is made of ultrafine fibers, it exhibits high elasticity of 600% or more in elongation and tensile strength in a direction of about 4.0 or more. In addition, the nonwoven fabric has a Moisture Vapor Transmission Rate (MVTR) value of 1,000 to 50,000 g / m ² 24h and 2,000 ~ 20,000 mmH ₂ 0 exhibits a hydraulic pressure resistance.

Preferably, the nonwoven fabric used in the present invention is formed from a thermoplastic resin, and includes at least one of polyurethane, polyethylene, polypropylene, copolymers thereof, or mixtures thereof, or from composite fibers composed of polyolefins and polyamides. It is preferred to be prepared. In addition, two or more kinds of materials may be used, or the substrate may be formed in a multilayer structure using two or more kinds of other thermoplastic resins.

In addition, in the nanoweb nonwoven substrate of the nonwoven adhesive tape according to the present invention, the nanoweb nonwoven substrate can be used as a single layer as well as processed into a laminated member as a laminated film as needed to provide various properties. . The film to be laminated is not limited to the nanoweb nonwoven substrate, and various other plastic films, nonwovens, porous films, and the like can be given. Furthermore, when laminated, the film is not limited to simple lamination of nanoweb nonwoven substrates, but other films may be alternately laminated.

The nonwoven adhesive tape of the present invention has an adhesive layer 20 on one surface of a substrate. For example, the adhesive layer 20 is provided on the surface on the opposite side of the nanoweb nonwoven substrate. The pressure-sensitive adhesive layer 20 preferably has flexibility that can follow the skin, has a low moisture irritation to the skin, and has moisture permeability, and is preferably formed by using an adhesive that satisfies these requirements.

As the pressure-sensitive adhesive, for example, an acrylic pressure-sensitive adhesive, a rubber pressure-sensitive adhesive, a silicone pressure-sensitive adhesive, a vinyl ether pressure-sensitive adhesive or the like can be used. The pressure-sensitive adhesive may be a water-soluble or water-soluble resin such as a plasticizer typified by polyhydric alcohols such as glycerin, polyethylene glycol, polypropylene glycol, polyacrylic acid, polyacrylic acid crosslinked body, and polyvinyl pyrrolidone, rosin-based, and terpene-based, if necessary. And various additives such as tackifiers such as petroleum, various softeners, fillers, and pigments.

As the rubber-based pressure-sensitive adhesive, rubber materials such as synthetic polyisoprene rubber, styrene-isoprene-styrene block copolymer, natural rubber, polyisobutylene and polybutene can be used.

As an acrylic adhesive, a homogenous aggregate or copolymer of acrylic ester monomers, such as butyl acrylate, isononyl acrylate, and 2-ethylhexyl acrylate, or these acrylic ester monomers, acrylic acid, 2-hydroxyethyl acrylate, and vinyl acetate And acrylate aggregates such as copolymers with other monomers such as these. As a preferable acrylic adhesive, 70-95 weight% of (meth) acrylic-acid alkylester which has a C4-C12 alkyl group, 4-29 weight% of (meth) acrylic-acid alkoxy polyalkylene glycol ester, a hydroxyl group, a carboxyl group, etc. are mentioned, for example. The copolymer which copolymerized 1-10 weight% of functional group containing monomers and 0-25 weight% of other copolymerizable vinyl monomers is mentioned.

It is preferable that it is 10-100 micrometers, and, as for the thickness of the adhesive layer 20, it is more preferable that it is 20-70 micrometers. When the thickness of the pressure-sensitive adhesive layer is 10 μm or more, sufficient adhesiveness may be difficult to be exhibited. On the contrary, when the thickness of the pressure-sensitive adhesive layer exceeds 100 μm, water vapor permeability may decrease or skin irritation may be caused.

Moreover, the adhesive layer 20 may be provided in the whole surface of one surface of a nanoweb nonwoven fabric base material, or may be provided in part. When providing the adhesive layer 20 partially, you may provide in the stripe form of fixed width, or you may provide in the wave form stripe form. The pressure-sensitive adhesive layer may be formed by solution coating of the pressure-sensitive adhesive or by emulsion coating or hot melt coating.

In the nonwoven fabric adhesive tape of the present invention, in order to prevent contamination of the surface of the adhesive layer, it is preferable to cover the release film 30 on the adhesive layer. As the release film 30, in order to improve the release property to an adhesive layer, it is preferable to use the thing containing the silicone type mold release agent containing an organosiloxane type polymer.

As a mold release agent which comprises the release film 30, although silicone type or a non-silicone type is used, in view of adhesion of adhesive tapes at the time of use, a non-silicone type release agent is preferable, For example, polyvinyl alcohol and octadecyl isocyanate are preferable. The reactant, the reactant of polyethyleneimine and octadecyl isocyanate, the copolymer containing stearyl acrylate, the copolymer containing the reaction product of the monomer and octadecyl isocyanate which have a functional group, etc. are used. The application amount of a mold release agent is about 0.01-10 g / m <^2> normally.

The tensile breaking strength of the nonwoven adhesive tape of the present invention is preferably in the range of 5 to 30 N / 25 mm, more preferably in the range of 7 to 25 N / 25 mm, and the elongation at break is preferably 40 to 100%. More preferably, it exists in the range of 45 to 80%. The tear resistance of the nonwoven fabric adhesive tape of the present invention is preferably 1.5 to 2.5 N / 25 mm, more preferably in the range of 2.0 to 2.8 N / 25 mm.

The nonwoven fabric adhesive tape of this invention is used in the form of the sheet form of various sizes, a tape length, etc., and can also be preserve | saved in roll form. Such a nonwoven adhesive tape can be used in applications such as skin application, for example, in the field of medical hygiene, external use, and the like, and can be particularly suitably used in a bandage, adhesive bandage, dressing material, tape for tape, and the like. However, it can be used for any purpose other than medical use, for example, it can also be used as a surface protection tape or packaging tape.

Another embodiment of the present invention relates to a method for producing a nonwoven adhesive tape. When manufacturing a nonwoven fabric adhesive tape by this invention, a nonwoven fabric adhesive tape is manufactured by electrospinning a thermoplastic polymer chip and forming a nano web. Electrospinning may proceed by solution electrospinning or melt electrospinning, but may preferably proceed by melt electrospinning. By appropriately adjusting the conditions during electrospinning, nanofibers having a diameter of 100 to 5,000 nm can be produced.

When the thermoplastic chip is prepared, the ultrafine elastic fibers are spun on the collector by electrospinning to form a nanofiber web under the condition that a voltage is applied between the spinneret and the collector. The nanofiber web is fused with a three-dimensional network at the same time the thermoplastic ultra-fine nanofibers are electrospun to form a substrate of the porous non-woven adhesive tape.

3 shows an example of an electrospinning apparatus that can be used in the method of the present invention. Referring to FIG. 3, the electrospinning unit includes a polymer supply unit 100 supplying a polymer melt, a radiation nozzle 310 through which a polymer spinning liquid transferred from the polymer supply unit is discharged, and a high voltage generator applying a high voltage to the spinning nozzle ( 400) and a collector 500 for collecting the fibers discharged from the spinning nozzle.

 Nanofibers radiated by electrospinning are nano-grade fibers having a diameter of 100 to 5000 nm, and the nanofibers having a thickness of 0.1 to 5 mm may be prepared by integrating such nanofibers into a collector.

The nanofiber web obtained by electrospinning is then thermally fused by calendering to obtain a porous nanofiber nonwoven fabric. The calendaring step can be performed by a calendaring roll at a temperature of 100 degrees to 120 degrees.

When the porous nanoweb nanoweb nonwoven substrate is manufactured, an adhesive layer may be formed by applying an adhesive to one surface of the substrate. To apply the pressure-sensitive adhesive, a solution obtained by uniformly dissolving or dispersing the pressure-sensitive adhesive and other additive components in an organic solvent may be applied on a nanoweb nonwoven fabric substrate and then dried. In order to further improve the adhesion of the substrate to the adhesive layer, the surface of the substrate on which the adhesive layer is formed may be further surface treated by corona release or plasma treatment. The opposite side of the adhesive layer applied in the present invention may be coated with a release film. The coating method of a release film is not specifically limited, A release film can be coat | covered according to a conventional method.

The present invention will be described in more detail with reference to the following examples. These examples are intended to illustrate preferred embodiments of the present invention, and the scope of protection of the present invention is not limited to these examples.

Example

Example 1

The polyether-based polyurethane is supplied to the polymer supply unit, and a spinning solution is prepared by applying a temperature of 150 to 300 ° C to the supplied polyester-based polyurethane chip. When the spinning solution was prepared, a hydrophilic polyurethane web was collected by applying a high voltage of 5 to 30 kV between the spinning nozzle and the fiber collecting unit through which the spinning solution was discharged. The distance from the spinning nozzle to the fiber collection part was 10 to 60 cm and electrospun. The nanoweb nonwoven fabric was formed by calendering at a temperature of about 120 degrees after electrospinning.

Subsequently, Hico's acrylic copolymer adhesive was bonded to the obtained nanoweb nonwoven fabric to prepare an adhesive tape having an adhesive layer on the substrate. The strength and elongation of the prepared nonwoven fabric and the pressure-sensitive adhesive layer is shown in Table 1 below. In addition, the scanning electron micrograph of the obtained nonwoven fabric adhesive tape is shown in FIG. Referring to FIG. 2, the electrospun nanofibers formed nonwoven fabrics intertwined with each other, and a plurality of pores were formed to impart air permeability between the nanofibers.

Example Non-woven Nonwoven Fabric with Adhesive Layer Strength (MPa) 5.47 MPa 4.1 MPa Elongation (%) 610% 548% MVTR 42,000 g / m ² 24h) Unmeasured Water pressure 3000 mmH ₂ 0 Unmeasured

[Property evaluation method]

(1) strength and elongation

The strength and elongation of nonwoven fabrics were measured by KS M 3054.

(2) moisture permeability

In order to evaluate the moisture permeability of the nonwoven fabric prepared in Example 1, MVTR (g / m ² 24h) was measured according to the Korean standard (ks) KS K 0594.

(2) water pressure

In order to evaluate the water repellency of the nonwoven fabric prepared in Example 1, the water pressure was evaluated according to the Korean standard (ks) KS K 0592.

As can be seen from Table 1, the nonwoven adhesive tape of the present invention can exhibit sufficient adhesion and moisture-permeable waterproof performance while maintaining high strength while exhibiting high elasticity of 600% or more.

Although the above has been described in detail with reference to a preferred embodiment of the present invention, this description is merely to describe and disclose an exemplary embodiment of the present invention. Those skilled in the art will readily recognize that various changes, modifications and variations can be made from the above description and the accompanying drawings without departing from the scope and spirit of the invention, and such variations or modifications should be construed as belonging to the claims of the invention. .

10: nanoweb nonwoven substrate
20: adhesive layer
30: release film
100: polymer supply unit 130: solution storage unit
150: metering pump 310: spinning nozzle
400: high voltage generator 500: collector

Claims (10)

A nonwoven adhesive tape comprising a substrate, an adhesive layer, and a release film, wherein the substrate comprises a porous nanoweb nonwoven fabric produced by electrospinning.
According to claim 1, The diameter of the nanofibers constituting the porous nonwoven fabric constituting the substrate is 100 to 5000 nm, the average pore size of the nonwoven fabric is 0.1 μm to 10 μm, the porosity is 50 to 90% by volume ratio , The thickness of the porous nonwoven fabric is nonwoven fabric adhesive tape, characterized in that 0.1 to 5 mm.
The method of claim 1, wherein the nanoweb nanoweb nonwoven substrate has an elongation of at least 600%, has a tensile strength in the direction of about 4.0 or more, a Moisture Vapor Transmission Rate (MVTR) value of 1,000 ~ 50,000 g / m ₂ 24h and 2,000 Non-woven adhesive tape, characterized in that ~ 20,000 mmH ₂ 0 has a water resistance characteristics.
The nonwoven adhesive tape of claim 1 wherein the substrate comprises at least one of polyurethane, polyethylene, polypropylene, copolymers thereof, or mixtures thereof, or is made from composite fibers consisting of polyolefins and polyamides. . The nonwoven adhesive tape according to claim 1, wherein the breaking strength of the nonwoven adhesive tape is in the range of 5 N / 25 to 30 N / 25 mm, and the tear resistance is 1.5 to 2.5 N / 25 mm.
Preparing a thermoplastic polymer spun polymer material;
Electrospinning the spun polymer material into a porous nanofiber web; And
Thermally bonding the electrospun nanofiber web by calendering to obtain a porous nanofiber nonwoven fabric;
Applying an adhesive composition to at least a portion of one surface of the nanoweb nonwoven substrate and then bonding by heat treatment to form an adhesive layer;
Method for producing a non-woven adhesive tape, comprising the step of laminating a release film on the adhesive layer.
The method of manufacturing a nonwoven adhesive tape according to claim 6, wherein the electrospinning step is performed by melt electrospinning.
The method of claim 6, wherein the electrospinning step is a step of spinning so that the diameter of the thermoplastic polyurethane elastic fiber is 100 ~ 5000nm.
The method of claim 6, wherein the heat treatment is performed by hot roll calendering at the glass transition temperature of the polymer.
10. The method of claim 9, wherein the calendering step is thermally fused by a calendering roll at a temperature of 100 degrees to 120 degrees.

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