KR102235485B1 - Protective restoration fabric with excellent virus blocking performance and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a protective restoration fabric having excellent virus blocking performance and a method for manufacturing the same. More specifically, the present invention relates to a protective restoration fabric, and a method for manufacturing the same, wherein the protective restoration fabric has a structure in which a breathable laminate in which two or more layers of a breathable film are laminated and a nonwoven fabric are laminated, and the protective restoration fabric has thin overall thickness, so that the fabric is not heavy and light, virus barrier properties are excellent, and at the same mechanical properties and breathability are excellent.

Description

Protective restoration fabric with excellent virus blocking performance and manufacturing method thereof

The present invention relates to a protective fabric with excellent virus blocking performance and a method of manufacturing the same. More specifically, the present invention is a structure in which a breathable laminate in which two or more layers of a breathable film are stacked and a nonwoven fabric are laminated, and the overall thickness is thin, so the fabric is not heavy and light, but has excellent virus barrier properties, and at the same time, mechanical properties and ventilation are excellent. It relates to a restoration stage and a method of manufacturing the same.

In the case of surgical clothing and protective clothing, functionalities are imparted by bonding films having different functions to impart functionality. In particular, in order to impart water resistance and chemical resistance, a breathable film in which micropores are formed mainly using calcium carbonate and an olefin-based nonwoven fabric to improve physical strength are used in combination. Such a fabric can be used as a fabric for imparting waterproof and chemical resistance, but there is a problem in that it cannot effectively protect against viruses due to the large pores of the film.

In order to solve this problem, a product has been developed to block viruses by applying a method in which a polyurethane membrane or a polyurethane-based adhesive having good moisture permeability is applied to the breathable film entirely.

However, in the case of the fabric manufactured by this method, there is a disadvantage in that the moisture permeation effect and mechanical properties are not good, so that the fit is not good. In particular, since the polyurethane adhesive, which exhibits virus defense, has poor stability and decomposes over time, the virus defense is destroyed, so it is difficult to secure long-term reliability, so its use is inevitably limited.

Therefore, a lot of research has been conducted on fabrics for surgical clothing or protective clothing that can simultaneously satisfy the mechanical properties, moisture permeability, and virus defense required by the market, but products that can satisfy all of them have not been released.

Korean Registered Patent Publication No. 10-1996883 (2019.07.01.)

An object of the present invention is to provide a new method of manufacturing a fabric and a new method for manufacturing the same, while the overall fabric is thin and light, and has superior virus blocking properties compared to conventional fabrics of the same thickness, and at the same time has excellent mechanical properties, moisture permeability, and breathability. I want to provide.

An object of the present invention is to provide a fabric that is light when manufactured as a surgical or protective clothing, and has a good fit for a user, and a new method for manufacturing the same.

As a result of research to achieve the above task, a breathable film was prepared by a specific method, and by laminating it in a specific structure, the overall thickness is thin, so the fabric is light and has virus-blocking properties, and at the same time, mechanical properties, moisture permeability, and breathability are excellent. The present invention was completed by discovering that a protective fabric can be provided.

Specifically, one aspect of the present invention is a breathable laminate in which at least two breathable films are laminated, and a nonwoven fabric is laminated on at least one side of the breathable laminate,

The breathable film is laminated using a moisture-permeable polyurethane adhesive,

The breathable laminate and the nonwoven fabric are laminated by means of a moisture-permeable polyurethane adhesive or heat-pressing,

In accordance with JIS T 8061:2015, it relates to a protective fabric with excellent virus-blocking performance of class 3 or higher, and more preferably 5 or higher, according to JIS T 8061:2015.

Another aspect of the present invention is a) preparing a breathable laminate by laminating at least two or more breathable films using a moisture-permeable polyurethane adhesive;

b) laminating a nonwoven fabric after applying a moisture-permeable polyurethane adhesive to at least one surface of the breathable laminate or laminating the breathable laminate and the nonwoven fabric by heating and pressing;

It includes, and provides a method of manufacturing a protective fabric with excellent virus blocking performance of class 3 or more, and more preferably 5 or more, according to JIS T 8061:2015.

Another aspect of the present invention is a protective fabric with excellent virus blocking performance in which a dry polyolefin-based breathable film is laminated on both sides of a wet polyolefin-based breathable film using a moisture-permeable polyurethane adhesive,

The wet polyolefin-based breathable film is a polyolefin-based resin mixed with a pore-forming additive, which is an organic nanoparticle having an average particle diameter of 100 to 1000 nm, extruded and stretched, and then the pore-forming additive is extracted and removed,

The dry polyolefin-based breathable film is prepared by extruding and stretching inorganic particles having an average particle diameter of 0.5 to 10 µm in a polyolefin-based resin to provide a protective fabric having excellent virus blocking performance.

The protective clothing fabric having excellent virus-blocking performance according to an aspect of the present invention has a thin overall thickness and a light weight of the fabric, so that the wearer has a good fit.

In addition, it is possible to provide a fabric having a thin overall thickness, excellent virus barrier properties, and excellent mechanical properties, moisture permeability, and breathability.

In addition, it is possible to provide a new method of manufacturing a fabric having a thin overall thickness, excellent virus barrier properties, and excellent mechanical properties, moisture permeability, and breathability.

1 is a cross-sectional view showing an aspect of the protective fabric of the present invention.
Figure 2 is a cross-sectional view showing an aspect of the protective fabric of the present invention.
Figure 3 is a cross-sectional view showing an aspect of the protective fabric of the present invention.
Figure 4 is a cross-sectional view showing an aspect of the protective fabric of the present invention.

Hereinafter, the present invention will be described in more detail through the accompanying specific examples or examples. However, the following specific examples or examples are only one reference for describing the present invention in detail, and the present invention is not limited thereto, and may be implemented in various forms.

In addition, unless otherwise defined, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. The terms used in the description in the present invention are merely for effectively describing specific embodiments and are not intended to limit the present invention.

In addition, the singular form used in the specification and the appended claims may be intended to include the plural form unless otherwise indicated in the context.

In addition, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary.

One aspect of the present invention is a breathable laminate in which at least two breathable films are laminated, and a nonwoven fabric is laminated on at least one side of the breathable laminate,

The breathable film is laminated using a moisture-permeable polyurethane adhesive,

The breathable laminate and the nonwoven fabric are laminated by means of a moisture-permeable polyurethane adhesive or heat-pressing,

In accordance with JIS T 8061:2015, it relates to a protective fabric with excellent virus-blocking performance of class 3 or higher, and more preferably 5 or higher, according to JIS T 8061:2015.

In one aspect of the present invention, the nonwoven fabric may be a polyolefin-based nonwoven fabric.

In one aspect of the present invention, the breathable laminate is a dry type polyolefin-based resin mixed with inorganic particles and stretched, at least two or more laminated polyolefin-based breathable films, or a dry type extruded and stretched by mixing inorganic particles with a polyolefin-based resin. A polyolefin-based breathable film and at least two or more wet polyolefin-based breathable films obtained by extracting and removing the pore-forming additive after extruding and stretching by mixing a pore-forming additive with a polyolefin-based resin may be laminated.

In one aspect of the present invention, the pore-forming additive is organic nanoparticles having an average particle diameter of 100 to 1000 nm, and nano-sized uniform pores may be formed in the wet polyolefin-based breathable film by the organic nanoparticles.

In one aspect of the present invention, the pore-forming additive is a mixture of two types of polymethyl methacrylate nanoparticles having different average particle diameters, and the wet polyolefin-based breathable film may have uniform pores with a bimodal particle distribution. have.

In one aspect of the present invention, the pore-forming additive is a mixture of first polymethyl methacrylate nanoparticles having an average particle diameter of 100 to 400 nm and second polymethyl methacrylate nanoparticles having an average particle diameter of 400 to 1000 nm. It may have been used.

In one aspect of the present invention, the dry polyolefin-based breathable film may be prepared by a blown casting method.

In one aspect of the present invention, the protective fabric may be a nonwoven fabric laminated on one or both sides of a breathable laminate in which at least two dry polyolefin-based breathable films are laminated.

In one aspect of the present invention, the protective fabric may be a breathable laminate in which a dry polyolefin-based breathable film and a wet polyolefin-based breathable film are laminated, and a non-woven fabric is laminated on the wet polyolefin-based breathable film of the breathable laminate. .

In one aspect of the present invention, the protective fabric may be a breathable laminate in which a dry polyolefin-based breathable film and a wet polyolefin-based breathable film are laminated, and a nonwoven fabric is laminated on both sides of the breathable laminate.

In one aspect of the present invention, the protective clothing fabric has a thickness of 100 to 300 μm, a tensile strength according to ASTM D5034 of 100 N/50 mm or more, an elongation of 40% or more, and a moisture permeability according to ASTM E96 of 3,000 g/ It may be ㎡ · 24hr or more, and the water pressure in accordance with AATCC 127 may be 300 mbar or more.

Another aspect of the present invention is a method of manufacturing a protective fabric with excellent virus blocking performance,

a) manufacturing a breathable laminate by laminating at least two breathable films using a moisture-permeable polyurethane adhesive;

b) laminating a nonwoven fabric after applying a moisture-permeable polyurethane adhesive to at least one surface of the breathable laminate or laminating the breathable laminate and the nonwoven fabric by heating and pressing;

Including, and according to JIS T 8061:2015, a virus barrier property of class 3 or more, more preferably 5 or more, and even more preferably 6, is a method for producing a protective fabric with excellent virus blocking performance.

In one aspect of the present invention, the breathable laminate is a dry type polyolefin-based resin mixed with inorganic particles and stretched, at least two or more laminated polyolefin-based breathable films, or a dry type extruded and stretched by mixing inorganic particles with a polyolefin-based resin. A polyolefin-based breathable film and at least two or more wet polyolefin-based breathable films obtained by extracting and removing the pore-forming additive after extruding and stretching by mixing a pore-forming additive with a polyolefin-based resin may be laminated.

In one aspect of the present invention, the wet polyolefin-based breathable film is extruded and stretched by mixing organic nanoparticles having an average particle diameter of 100 to 1000 nm as a pore-forming additive in a polyolefin-based resin, and then dissolving the organic nanoparticles. And, the organic nanoparticles may be extracted and removed using a solvent that does not dissolve the polyolefin-based resin, thereby forming uniform pores of a nano size.

In one aspect of the present invention, the organic nanoparticles are a mixture of two types of polymethyl methacrylate nanoparticles having different average particle diameters, and the wet polyolefin-based breathable film may have uniform pores with a bimodal particle distribution. have.

In one aspect of the present invention, the organic nanoparticles are mixed with first polymethyl methacrylate nanoparticles having an average particle diameter of 100 to 400 nm and second polymethyl methacrylate nanoparticles having an average particle diameter of 400 to 1000 nm It may have been used.

In one aspect of the present invention, the pore-forming additive may be used in an amount of 50 to 300 parts by weight based on 100 parts by weight of the polyolefin-based resin.

In one aspect of the present invention, the inorganic particles may be any one or a mixture of two or more selected from calcium carbonate, talc, clay, kaolin, silica, and diatomaceous earth having an average particle diameter of 0.5 to 10 μm.

In one aspect of the present invention, the dry polyolefin-based breathable film may be prepared by a blown casting method.

Another aspect of the present invention is a protective fabric with excellent virus blocking performance in which a dry polyolefin-based breathable film is laminated on both sides of a wet polyolefin-based breathable film using a moisture-permeable polyurethane adhesive,

The wet polyolefin-based breathable film is a polyolefin-based resin mixed with a pore-forming additive, which is an organic nanoparticle having an average particle diameter of 100 to 1000 nm, extruded and stretched, and then the pore-forming additive is extracted and removed,

The dry polyolefin-based breathable film is prepared by extruding and stretching inorganic particles having an average particle diameter of 0.5 to 10 µm in a polyolefin-based resin to provide a protective fabric having excellent virus blocking performance.

In one aspect of the present invention, the inorganic particles are any one or a mixture of two or more selected from calcium carbonate, talc, clay, kaolin, silica and diatomaceous earth,

The organic nanoparticles may be a mixture of first polymethyl methacrylate nanoparticles having an average particle diameter of 100 to 400 nm and second polymethyl methacrylate nanoparticles having an average particle diameter of 400 to 1000 nm.

In one aspect of the present invention, a protective fabric having excellent virus blocking performance in which a dry polyolefin-based breathable film is laminated using a moisture-permeable polyurethane adhesive on both sides of the wet polyolefin-based breathable film is a virus barrier property according to JIS T 8061:2015. This class 3 or more, more preferably 5 or more, and even more preferably 6, can provide a protective fabric with excellent virus blocking performance.

Hereinafter, in the present invention, the “dry polyolefin-based breathable film” refers to a breathable film prepared by mixing and extruding inorganic particles such as calcium carbonate with a polyolefin-based resin, followed by stretching. At this time, it is possible to extrude by T-die or blow casting, and when extruding by blow casting, it is more preferable because a film with few pinholes can be produced. The dry polyolefin-based breathable film thus prepared may have a thickness of 15 to 30 µm, but is not limited thereto, and a film having excellent virus barrier properties and excellent mechanical properties and air permeability within the above range may be provided. In addition, the basis weight is 10 to 50 gsm, the tensile strength according to ASTM D5034 is 0.1 to 3 kgf/25mm in the TD direction, 5 to 30 kgf/25mm in the MD direction, and the elongation is 30 to 400%, according to ASTM E96. Accordingly, it is preferable to achieve the desired physical properties in a range that satisfies all physical properties of 8500 to 9500 g/m 2 ·24 hr.

In addition, the'wet polyolefin-based breathable film' is a breathable film in which pores of uniform size are formed by extracting and removing the pore-forming additive after extrusion and stretching by mixing a polyolefin-based resin with a pore-forming additive such as organic nanoparticles or wax. Means. The wet polyolefin-based breathable film thus prepared may have a thickness of 1 to 15 µm, but is not limited thereto, and a film having excellent virus barrier properties and excellent mechanical properties and air permeability within the above range may be provided. In addition, the basis weight is 5 to 20 gsm, more preferably 5 to 10 gsm, the tensile strength according to ASTM D5034 is 3 to 9 kgf/25 mm in the MD direction and the TD direction, respectively, and the elongation is 10 in the MD direction and the TD direction, respectively. To 60%, more preferably 40 to 60%, and a moisture permeability according to ASTM E96 of 3500 to 22000 g/m 2 ·24 hr, more preferably 10000 to 22000 g/m 2 ·24 hr. It is desirable to achieve physical properties.

Since the'dry polyolefin-based breathable film' and the'wet polyolefin-based breathable film' can be manufactured by a conventional method, detailed descriptions will be omitted.

In the present invention, the breathable laminate means that two or more layers of a dry polyolefin-based breathable film are laminated, or a dry polyolefin-based breathable film and a wet polyolefin-based breathable film are alternately laminated.

It is not excluded that two or more layers of a wet polyolefin-based breathable film are laminated as the breathable laminate, but in this case, the virus barrier property according to IS T 8061:2015 may be lowered to less than class 3.

In addition, when the breathable laminate and the non-woven fabric are laminated to form a protective fabric, two or more layers of a dry polyolefin-based breathable film are laminated, or a dry polyolefin-based breathable film, compared to two or more layers of a wet polyolefin-based breathable film. When the over-wet polyolefin-based breathable films are alternately laminated, the user has better breathability and moisture permeability, and the fabric is light due to its soft fit and thin thickness. In addition, it may be preferred to alternately laminate a dry polyolefin-based breathable film and a wet polyolefin-based breathable film from the viewpoint of lighter weight of the fabric and further improved fit.

Hereinafter, the laminated structure of the protective fabric of the present invention will be described in more detail with reference to the drawings.

The first aspect of the protective clothing fabric of the present invention is a nonwoven fabric 20, a wet polyolefin-based breathable film 11, and a dry polyolefin-based breathable film 12 are sequentially stacked, as shown in FIG. 1. At this time, the wet polyolefin-based breathable film and the dry polyolefin-based breathable film are laminated using a moisture-permeable polyurethane adhesive to form a breathable laminate (10), and the wet polyolefin-based breathable film (11) of the breathable laminate (10) and The non-woven fabric 20 is laminated by heat-pressing or a moisture-permeable polyurethane adhesive, and the virus barrier property according to JIS T 8061:2015 may be class 3 or more, more preferably 5 or more.

As in the first aspect, when using the breathable laminate 10 in which a wet polyolefin-based breathable film and a dry polyolefin-based breathable film are laminated is used, it is preferable that the dry polyolefin-based breathable film forms the outermost layer. In this way, by forming the outermost layer of the dry polyolefin-based breathable film, not only virus blocking properties, but also air permeability are more excellent, so that the wearer can provide a protective clothing having a more excellent fit.

In addition, as in the first aspect, in the case of using the breathable laminate 10 in which a wet polyolefin-based breathable film and a dry polyolefin-based breathable film are laminated, compared to the case where two or more layers of dry polyolefin-based breathable films are laminated, the fabric It is possible to provide a fabric having a thinner thickness and excellent virus protection and breathability.

The second aspect of the protective clothing fabric of the present invention is a non-woven fabric 20, a wet polyolefin-based breathable film 11, a dry polyolefin-based breathable film 12, and a non-woven fabric 20 are sequentially laminated as shown in FIG. It was done. Except for the above, since it is the same as that of the first aspect, redundant descriptions are omitted.

The third aspect of the protective clothing fabric of the present invention is a nonwoven fabric 20, a first dry polyolefin-based breathable film 12, and a second dry polyolefin-based breathable film 12 are sequentially stacked, as shown in FIG. will be. Except for the above, since it is the same as that of the first aspect, redundant descriptions are omitted.

The fourth aspect of the protective clothing fabric of the present invention is a nonwoven fabric 20, a first dry polyolefin-based breathable film 12, a second dry polyolefin-based breathable film 12, and a non-woven fabric ( 20) is stacked. Except for the above, since it is the same as that of the first aspect, redundant descriptions are omitted.

The fifth aspect of the protective clothing fabric of the present invention is a first dry polyolefin-based breathable film 12, a wet polyolefin-based breathable film 11 and a second dry polyolefin-based breathable film 12 sequentially, as shown in FIG. 5. ) Is stacked.

Hereinafter, each configuration of the present invention will be described in more detail.

First, a description will be given of a dry polyolefin-based breathable film, which is stretched by mixing inorganic particles with a polyolefin-based resin.

The polyolefin-based resin is not particularly limited, but may be used alone or in combination with a polyethylene resin and a polypropylene resin.

The polyethylene resin may have a weight average molecular weight of 300,000 to 500,000 g/mol, but is not limited thereto. The polypropylene resin preferably has a weight average molecular weight of 200,000 to 400,000 g/mol, but is not limited thereto. In addition, when these are mixed and used, it is more preferable to add 5 to 50 parts by weight of a polypropylene resin to 100 parts by weight of the polyethylene resin.

More specifically, the polyethylene resin may be one selected from low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE), or a mixture thereof, and when using a mixture thereof, it is softer and more comfortable to wear. Specifically, for example, low-density polyethyl (LDPE) having a melt index of 1 to 10 g/10 min (190°C, 2.16 kg) and a density of 0.8 to 1.0 g/cm 3 (23°C), and a melt index of 1 to Linear low-density polyethylene (LLDPE) having a density of 0.8 to 1.0 g/cm 3 (23° C.) and 10 g/10 min (190° C., 2.16 kg) may be mixed and used.

The inorganic particles may be used without limitation as long as they are generally used in the relevant field, but specifically, for example, any one or a mixture of two or more selected from calcium carbonate, talc, clay, kaolin, silica, and diatomaceous earth may be used. The calcium carbonate may have an average particle diameter of 0.5 to 10 µm, more preferably 1 to 5 µm, and is not limited thereto, but may provide excellent breathability and virus blocking properties within the above range.

In addition, the inorganic particles may be those using 30 to 55% by weight, more specifically 40 to 50% by weight of the total weight of the film. In the above range, a film having excellent breathability may be provided, but is not limited thereto.

Next, a description will be given of the wet polyolefin-based breathable film, by mixing the polyolefin-based resin with a pore-forming additive, extruding and stretching, and then extracting and removing the pore-forming additive, thereby forming nano-sized uniform pores in the breathable film.

Since the polyolefin-based resin is the same as described above, redundant description will be omitted.

Examples of the pore-forming additive include phthalic acid, such as dibutyl phthalate and dihexylphthalate; Alternatively, aromatic ethers such as diphenyl ether may be used. In addition, solid paraffin wax and liquid paraffin oil can be used, and based on 100 parts by weight of polyolefin resin, 80 to 100 parts by weight of solid paraffin wax having a weight average molecular weight of 3,000 to 5,000 g/mol and a weight average molecular weight of 400 to 1,000 It is also possible to mix and use 60 to 80 parts by weight of liquid paraffin oil in g/mol.

More preferably, organic nanoparticles having an average particle diameter of 100 to 1000 nm may be used. The organic nanoparticles may be polyolefin resins and acrylic nanoparticles having excellent kneading properties, and specifically, it is preferable to mix and use two types of polymethyl methacrylate (PMMA) nanoparticles having different average particle diameters. Accordingly, the wet polyolefin-based breathable film may have uniform pores of bimodal particle distribution. In the present invention, "uniform pores" mean that, while the organic nanoparticles are removed, pores having the same size and shape as the size of the organic nanoparticles are formed in the place where the organic nanoparticles existed.

As such, it has a bimodal particle size, and as pores of a uniform size are formed, more excellent breathability and virus blocking properties can be provided.

The pore-forming additive may be used in an amount of 50 to 300 parts by weight based on 100 parts by weight of the polyolefin-based resin. More specifically, the pore-forming additive is used by mixing first polymethyl methacrylate nanoparticles having an average particle diameter of 100 to 400 nm and second polymethyl methacrylate nanoparticles having an average particle diameter of 400 to 1000 nm. It may be, and the mixing ratio thereof is not limited, but based on 100 parts by weight of the polyolefin resin, 100 to 120 parts by weight of the first polymethyl methacrylate nanoparticles and 80 to 100 parts by weight of the second polymethyl methacrylate nanoparticles It could be the use of wealth.

In addition, the method of extracting the pore-forming additive may be extracted using a solvent capable of dissolving only the pore-forming additive without dissolving the polyolefin-based resin. Accordingly, pores are formed in the place where the spherical pore-forming additive was present, and uniform and continuous pores having the same size as the pore-forming additive may be formed by using a pore-forming additive having a uniform size. In addition, since it is possible to form nano-sized pores of a finer size, a film having more excellent virus blocking properties can be prepared.

In one aspect of the present invention, the nonwoven fabric may be a nonwoven fabric manufactured by spunbond or spunlace. Representatively, the description of the nonwoven fabric is as follows. The nonwoven fabric refers to a nonwoven fabric manufactured by a conventional spunbond method or a spunlace method, but is not limited to any one resin selected from polyester, nylon, polyethylene, and polypropylene, more preferably a polypropylene resin. It is preferable to use the used spunbond, and it is possible to use a nonwoven fabric manufactured by a conventional spunbond method or a spunlace method. For example, a spunbond nonwoven fabric with a basis weight of 10 to 300 gsm can be used. The present invention can also achieve an effect excellent in air permeability by using such a nonwoven fabric.

The protective clothing fabric according to the present invention has a thickness of 100 to 300 µm, a tensile strength of 100 N/50 mm or more according to ASTM D5034, an elongation of 40% or more, and a moisture permeability of 3000 g/m 2 ·24 hr or more according to ASTM E96. And, the water resistance according to AATCC 127 can satisfy the physical properties of 300 mbar or more at the same time.

Next, a method of manufacturing the protective fabric of the present invention will be described.

One aspect of the method for manufacturing a protective clothing fabric having a virus barrier property of class 5 or higher according to JIS T 8061:2015 of the present invention

a) manufacturing a breathable laminate by laminating at least two breathable films using a moisture-permeable polyurethane adhesive;

b) laminating a nonwoven fabric after applying a moisture-permeable polyurethane adhesive to at least one surface of the breathable laminate or laminating the breathable laminate and the nonwoven fabric by heating and pressing;

Includes.

The moisture-permeable polyurethane adhesive used in step a) may be used without limitation as long as it is usually used in the minute.

The breathable polyurethane adhesive includes a polyol containing a diol component selected from polyethylene glycol diol or polypropylene glycol diol, or a mixed diol thereof, an isocyanate, preferably a chain extender , It may further include a catalyst and an organic solvent. Since the polymerization method of the breathable polyurethane of the present invention is a commonly known solution polymerization method or the like, further detailed description will be omitted. It is suitable for the purpose of the present invention that the breathable polyurethane resin (adhesive) has a moisture permeability in the range of 100 to 50,000 gram/m 2 x 24 hours (ASTM E96).

Specifically, for example, a polyurethane adhesive composition made of a polyol containing polyethylene glycol, polypropylene glycol diol, or a mixed diol component thereof having a number average molecular weight of 100 to 500,000 may be used.

The polyol uses a polyol component including polyethylene ether glycol diol, polypropylene ether glycol diol, or a mixed diol component thereof, and its number average molecular weight falls in the range of 100 to 500,000, and the solid content of the breathable polyurethane adhesive composition is 100 weight. The content of the polyol component including polyethylene ether glycol diol, polypropylene ether glycol diol, or a mixed diol component thereof based on parts is in the range of 10 to 90 parts by weight to maintain air permeability.

As the isocyanate of the breathable polyurethane resin (adhesive), 1,6-hexamethylene diisocyanate (1,6-Hexamethylene diisocyanate, HDI), isoprone diisocyanate (IPDI), meta-xylene diisocyanate (m-Xylenediisocyanate) , m-XDI), hydrogenated methylene diphenylenedimethylenediisocyanate (Hydrogenated Diphenylenedimethylenediisocyanate, H 12 MDI), meta-tetramethylxylennediisocyanate (m-Tetramethylxylennediisocyanate, m-TMXDI) one or more of one or more may be used in combination.

As the chain extender of the breathable polyurethane resin (adhesive), ethylene glycol (Ethyleneglycol, EG), 1,4-butanediol (1,4-Butanediol. 1,4-BD), 1,6-hexanediol (1,6) -Hexanediol, 1,6-HD), 1,2-propylene glycol (, 1,2-Propyleneglycol, 1,2-PG), 1,3-propanediol (1,3-Propanediol, 1,3-PDO) , Neopentylglycol (NPG), 2-methyl1,3-propanediol (2-Methyl-1,3-Propanediol, 2-MPD), 3-methyl-1,5-pentanediol (3-Methyl-) 1,5-Pentanediol, 3-MPD), 2-butyl-2-ethyl-1,3-propanediol (2-Butyl-2-ethyl-1,3-propanediol, BEPD) one or more than one used in combination It is used, but it is not specified. When used, the content is preferably 0.01 to 5 parts by weight of the total solid content, but is not limited thereto.

When preparing a breathable polyurethane resin (adhesive), the catalyst used in the polyurethane industry is used, but any one is not specified and may not be used.

When manufacturing polyurethane resin (adhesive), organic solvents include acetone, toluene, xylene, ethyl acetate, 2-butanone, cyclohexanone, N,N-Dimethylacetamine, N,N-Dimethylformamide, N-Methylpyrroridinone, Dichloromethane , Ethanol, Isopropyl alcohol, Methanol, one or two or more of them are used in combination.

It is recommended to use the breathable polyurethane adhesive composition in a solid content of 1 to 90% by weight, preferably 10 to 85% by weight, and the coating method is roll coating, dip coating, flow coating, gravure coating that can coat the entire surface. , Slot die coating, and other coating methods can be adopted.

The present invention was able to improve strength and resistance to moisture at the same time by laminating the breathable laminate and the nonwoven fabric with a breathable polyurethane adhesive. It is also known that it has additional effects that can be used, so long-term stable use is possible.

In addition, the breathable laminate is a dry polyolefin-based breathable film obtained by laminating at least two or more dry polyolefin-based breathable films stretched by mixing inorganic particles with a polyolefin-based resin, or extruded and stretched by mixing inorganic particles with a polyolefin-based resin. , At least two or more wet polyolefin-based breathable films obtained by extracting and removing the pore-forming additive after extrusion and stretching by mixing the polyolefin-based resin with a pore-forming additive may be laminated.

The wet polyolefin-based breathable film is extruded and stretched by mixing organic nanoparticles having an average particle diameter of 100 to 1000 nm as a pore-forming additive in a polyolefin-based resin, and then dissolving the organic nanoparticles and dissolving the polyolefin-based resin. Nano-sized uniform pores may be formed by extracting and removing the organic nanoparticles using a solvent that is not.

Next, in step b), after applying a moisture-permeable polyurethane adhesive to at least one side of the breathable laminate, the nonwoven fabric is laminated, or the breathable laminate and the nonwoven fabric are laminated by heating and pressing the virus barrier property according to JIS T 8061:2015. We manufacture protective clothing fabrics with excellent virus blocking performance of this class 5 or higher.

At this time, since the moisture-permeable polyurethane adhesive is the same as described above, a redundant description will be omitted.

The heat compression may be integrated by applying a temperature and pressure capable of heat bonding with the nonwoven fabric without impairing the breathability of the breathable laminate according to a conventional process. Therefore, the temperature and pressure can be changed according to the type of resin, and are not specifically limited.

Hereinafter, the present invention will be described in more detail based on Examples and Comparative Examples. However, the following Examples and Comparative Examples are only one example for describing the present invention in more detail, and the present invention is not limited by the following Examples and Comparative Examples.

Physical properties were measured as follows.

1) Tensile strength: Tensile strength at break according to ASTM D5034 in the longitudinal direction (machine direction) and transverse direction (mechanical vertical direction) was measured.

2) 　 Elongation: Elongation at break was measured in the longitudinal direction (machine direction) and transverse direction (mechanical vertical direction) according to ASTM D5034.

3) Moisture permeability: According to ASTM E96, the moisture permeability according to weight increase was measured after storage under constant temperature and humidity conditions for a certain period of time.

4) Water pressure resistance: Water pressure resistance was measured according to AATCC 127.

5）Virus blocking property: Measured by requesting KAKEN, an authorized testing agency in Japan.

It was measured in accordance with JIS T 8061:2015, and classified into Class 1 to 6, and Class 6 is the highest grade in international standards for virus protection and is the best.

[Production Example 1] Preparation of dry breathable film

Low-density polyethylene (LDPE, melt index 5.3g/10min (190℃, 2.16kg), density 0.919g/cm3 (23℃), Hanwha Petrochemical product name: 960) 10% by weight, linear low-density polyethylene (LLDPE, melting Index of 3.2g/10min (190℃, 2.16kg), density of 0.923g/cm3 (23℃), Hanwha Petrochemical, product name: HS 1700) 40% by weight, average particle diameter of 1㎛ 45% by weight of calcium carbonate and additives After mixing 5% by weight of a lubricant (Ca-St) in a blender, it was dried so that the content was less than 1%.

The dried mixture was melt-kneaded in a twin extruder (75mm, L/D 48) at a temperature of 230°C. At this time, the melt-kneading process was repeated twice to prepare a uniformly mixed compound composition, and then extruded through a T-die to prepare a film having a basis weight of 40 gsm.

The thus prepared film was stretched twice in the machine direction to prepare a dry breathable film having a basis weight of 20 gsm.

The prepared film had a thickness of 17 μm, a moisture permeability of 8862 g/m 2 24 hr, a tensile strength of 18 kgf/25 mm in the MD direction, 0.2 kgf/25 mm in the TD direction, an elongation of 38% in the MD direction, and 385% in the TD direction.

[Production Example 2] Preparation of a wet breathable film

With respect to 100 parts by weight of polyethylene resin having a weight average molecular weight of 380,000 g/mol, 10 parts by weight of polypropylene having a weight average molecular weight of 350,000 g/mol is added, and as a pore-forming additive, poly(methylmethacrylate) having an average particle diameter of 200 nm ) A raw resin mixture was prepared by mixing 110 parts by weight of nanoparticles and 83 parts by weight of PMMA nanoparticles having an average particle diameter of 500 nm.

The raw material resin mixture was introduced into an extruder equipped with a T-die, and extruded through a T-die while maintaining the rotational speed of the twin screw at 500 rpm at a temperature of 220°C to prepare a gel-like sheet having a thickness of 1,500 μm. Next, the gel sheet was cooled while passing between the casting roll and the nip roll.

Then, the sheet is stretched 8 times in the MD direction and 6 times in the TD direction at a temperature of 120°C using a biaxial stretching machine, and then the stretched sheet is immersed in a tetrahydrofuran solution to extract and remove the pore-forming additive. I did. The stretched sheet was fixed to the frame and heat-set in an oven at 130° C. for 4 minutes to prepare a wet breathable film having a basis weight of 8 gsm. As the pore-forming additive was removed, it was confirmed that bimodal pores of uniform size were formed at regular intervals.

The prepared film had a thickness of 11 µm, a moisture permeability of 10967 g/m 2 24 hr, a tensile strength of 5.5 kgf/25 mm in the MD direction, 5.5 kgf/25 mm in the TD direction, an elongation of 53% in the MD direction, and 50% in the TD direction.

[Production Example 3]

Using the same raw material as in Example 1, a film was prepared by stretching twice by a blow casting method. The prepared film has a basis weight of 18 gsm, a thickness of 17 μm, a moisture permeability of 8620 g/m 2 24 hr, a tensile strength of 15 kgf/25 mm in the MD direction, 15 kgf/25 mm in the TD direction, an elongation of 40% in the MD direction, and 41% in the TD direction. Was. In addition, it was confirmed that the occurrence of pinholes was less than that of the film prepared in Preparation Example 1.

[Example 1] Dry breathable film/dry breathable film/nonwoven layer triple structure manufacturing method

The two dry polyolefin-based breathable films prepared in Preparation Example 1 were laminated using a dry laminating device using a moisture-permeable polyurethane adhesive (manufacturer: Samho Hwaseong, product name: SUA-3180) to prepare a breathable laminate.

In addition, a spunbond nonwoven fabric (resin: polypropylene (PP), basis weight: 30 gsm, thickness: 156 μm, tensile strength: MD direction 6.801 kgf/50 mm, TD direction 4.214 kgf/50 mm, elongation on one side of the dry polyolefin-based breathable film) : 120% in the MD direction and 146% in the TD direction) were laminated using a dry laminating device using a moisture-permeable polyurethane adhesive (manufacturer: Samho Hwaseong, product name: SUA-3180) to prepare a protective fabric.

The physical properties of the laminated fabric having a triple structure thus prepared are measured and shown in Table 1.

[Example 2] Dry breathable film/wet breathable film/nonwoven layer triple structure manufacturing method

The dry polyolefin-based breathable film prepared in Preparation Example 1 and the wet polyolefin-based breathable film prepared in Preparation Example 2 were mixed with a moisture-permeable polyurethane adhesive (manufacturer: Samho Hwaseong, product name: SUA-3180) using a dry laminating device. And laminated to prepare a breathable laminate.

In addition, a spunbond nonwoven fabric (resin: polypropylene (PP), basis weight: 20 gsm, thickness: 108 μm, tensile strength: MD direction 4.284 kgf/50 mm, TD direction 2.884 kgf/50 mm, elongation on one side of the wet polyolefin-based breathable film) : 76% in MD direction, 72% in TD direction) was laminated using a dry laminating device using a moisture-permeable polyurethane adhesive (manufacturer: Samho Hwaseong, product name: SUA-3180) to prepare a protective fabric.

The physical properties of the laminated fabric having a triple structure thus prepared are measured and shown in Table 1.

[Example 3] Dry breathable film/dry breathable film/nonwoven layer triple structure manufacturing method

Two sheets of the dry polyolefin-based breathable film prepared in Preparation Example 3 were laminated using a dry laminating device using a moisture-permeable polyurethane adhesive (manufacturer: Samho Hwaseong, product name: SUA-3180) to prepare a breathable laminate.

In addition, a spunbond nonwoven fabric (resin: polypropylene (PP), basis weight: 30 gsm, thickness: 156 μm, tensile strength: MD direction 6.801 kgf/50 mm, TD direction 4.214 kgf/50 mm, elongation on one side of the dry polyolefin-based breathable film) : 120% in the MD direction and 146% in the TD direction) were laminated using a dry laminating device using a moisture-permeable polyurethane adhesive (manufacturer: Samho Hwaseong, product name: SUA-3180) to prepare a protective fabric.

The physical properties of the laminated fabric having a triple structure thus prepared are measured and shown in Table 1.

[Example 4] Dry breathable film/wet breathable film/dry breathable film triple structure manufacturing method

On both sides of the wet polyolefin-based breathable film prepared in Preparation Example 2, the dry polyolefin-based breathable film prepared in Preparation Example 1 was laminated using a moisture-permeable polyurethane adhesive (manufacturer: Samho Hwaseong, product name: SUA-3180). A breathable laminate was prepared.

The physical properties of the laminated fabric having a triple structure thus prepared are measured and shown in Table 1.

[Comparative Example 1] Dry Breathable Film/Nonwoven Fabric Layer Dual Structure Manufacturing Method

The dry polyolefin-based breathable film and spunbond nonwoven fabric prepared in Preparation Example 1 (resin: polypropylene (PP), basis weight: 30 gsm, thickness: 173 μm, tensile strength: MD direction 6.684 kgf/50mm, TD direction 4.231 kgf/50mm , Elongation: 105% in MD direction, 127% in TD direction) was bonded with a moisture-permeable polyurethane adhesive (manufacturer: Samho Hwaseong, product name: SUA-3180) to prepare a laminated film.

[Comparative Example 2] Wet Breathable Film/Nonwoven Fabric Layer Dual Structure Manufacturing Method

The dry polyolefin-based breathable film and spunbond nonwoven fabric prepared in Preparation Example 2 (resin: polypropylene (PP), basis weight: 30 gsm, thickness: 173 μm, tensile strength: MD direction 6.684 kgf/50mm, TD direction 4.231 kgf/50mm , Elongation: 105% in MD direction, 127% in TD direction) was bonded with a moisture-permeable polyurethane adhesive (manufacturer: Samho Hwaseong, product name: SUA-3180) to prepare a laminated film.

Evaluation results Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Tensile strength (MD/TD)
(N/50mm) 116/49 159/142 125/118 162/142 87/44 72/71 Elongation (MD/TD)
(%) 50/124 46/42 50/52 34/42 52/132 51/55 Moisture permeability(g/m ² ·24hrs) 4636 7608 5380 5800 890 8203 Water pressure (mbar) 310 500 400 500 292 600 virus
Barrier properties Class 6 Class 6 Class 6 Class 6 fail fail

As described above, in the present invention, it has been described by specific matters and limited embodiments and drawings, but this is only provided to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments, and the present invention is Those of ordinary skill in the relevant field can make various modifications and variations from these descriptions.

Therefore, the spirit of the present invention is limited to the described embodiments and should not be defined, and all things that are equivalent or equivalent to the claims as well as the claims to be described later fall within the scope of the spirit of the present invention. .

10: breathable laminate
11: Wet polyolefin-based breathable film
12: dry polyolefin-based breathable film
20: non-woven fabric

Claims (22)

A breathable laminate in which at least two breathable films are laminated, and a nonwoven fabric is laminated on at least one side of the breathable laminate, and the breathable laminate and the nonwoven fabric are laminated by means of a moisture-permeable polyurethane adhesive or heat compression,
The breathable laminate is a dry polyolefin-based breathable film extruded and stretched by mixing inorganic particles with a polyolefin-based resin, and a wet polyolefin removed by extracting the pore-forming additive after extruding and stretching by mixing a pore-forming additive with a polyolefin-based resin. The system breathable film is at least two or more laminated using a moisture-permeable polyurethane adhesive,
A protective fabric with excellent virus-blocking performance with a virus barrier property of Class 3 or higher according to JIS T 8061:2015. The method of claim 1,
The non-woven fabric is a polyolefin-based non-woven fabric with excellent virus blocking performance. The method of claim 1,
The wet polyolefin-based breathable film has a thickness of 1 to 15 µm and a moisture permeability according to ASTM E96 of 10000 to 22000 g/m 2 ·24 hr,
The dry polyolefin-based breathable film has a thickness of 15 to 30 µm, and a moisture permeability according to ASTM E96 of 8500 to 9500 g/m 2 ·24hr, which has excellent virus blocking performance. The method of claim 1,
The pore-forming additive is an organic nanoparticle having an average particle diameter of 100 to 1000 nm, and a protective fabric having excellent virus blocking performance in which nano-sized uniform pores are formed in the wet polyolefin-based breathable film by the organic nanoparticles. The method of claim 4,
The pore-forming additive is a mixture of two types of polymethyl methacrylate nanoparticles having different average particle diameters, and the wet polyolefin-based breathable film has uniform pores with a bimodal particle distribution. only. The method of claim 5,
The pore-forming additive is a mixture of first polymethyl methacrylate nanoparticles having an average particle diameter of 100 to 400 nm and second polymethyl methacrylate nanoparticles having an average particle diameter of 400 to 1000 nm. This excellent protective clothing fabric. The method of claim 1,
The dry polyolefin-based breathable film is a protective clothing fabric having excellent virus blocking performance that is produced by a blow casting method. The method of claim 1,
The protective fabric is a protective fabric having excellent virus blocking performance in which a non-woven fabric is laminated on one or both sides of a breathable laminate in which at least two dry polyolefin-based breathable films are laminated. The method of claim 1,
The protective fabric is a breathable laminate in which a dry polyolefin-based breathable film and a wet polyolefin-based breathable film are laminated, and a non-woven fabric is laminated on the wet polyolefin-based breathable film of the breathable laminate. . The method of claim 1,
The protective fabric is a breathable laminate in which a dry polyolefin-based breathable film and a wet polyolefin-based breathable film are laminated, and a non-woven fabric is laminated on both sides of the breathable laminate. The method of claim 1,
The protective clothing fabric has a thickness of 100 to 300 µm, a tensile strength of 100 N/50 mm or more according to ASTM D5034, an elongation of 40% or more, and a moisture permeability of 3000 g/m 2 ·24 hours or more according to ASTM E96, AATCC Protective fabric with excellent virus blocking performance with a water pressure of 300 mbar or more according to 127. a) A dry polyolefin-based breathable film extruded and stretched by mixing inorganic particles with a polyolefin-based resin, and a wet polyolefin-based breathable film obtained by extracting and removing the pore-forming additive after extruding and stretching by mixing a pore-forming additive with a polyolefin-based resin. Manufacturing at least two or more breathable laminates laminated using the moisture-permeable polyurethane adhesive;
b) laminating a nonwoven fabric after applying a moisture-permeable polyurethane adhesive to at least one surface of the breathable laminate or laminating the breathable laminate and the nonwoven fabric by heating and pressing;
Including, and a method of manufacturing a protective clothing fabric excellent in virus blocking performance of class 3 or higher virus barrier properties according to JIS T 8061:2015. The method of claim 12,
The wet polyolefin-based breathable film has a thickness of 1 to 15 µm and a moisture permeability according to ASTM E96 of 10000 to 22000 g/m 2 ·24 hr,
The dry polyolefin-based breathable film has a thickness of 15 to 30 µm, and a moisture permeability according to ASTM E96 of 8500 to 9500 g/m 2 ·24 hr. The method of claim 12,
The wet polyolefin-based breathable film is extruded and stretched by mixing organic nanoparticles having an average particle diameter of 100 to 1000 nm as a pore-forming additive in a polyolefin-based resin, and then dissolving the organic nanoparticles and dissolving the polyolefin-based resin. A method of manufacturing a protective clothing fabric having excellent virus blocking performance, wherein the organic nanoparticles are extracted and removed using a non-volatile solvent to form nano-sized uniform pores. The method of claim 14,
The organic nanoparticles are a mixture of two types of polymethylmethacrylate nanoparticles having different average particle diameters, and the wet polyolefin-based breathable film has uniform pores with a bimodal particle distribution. Dan's manufacturing method. The method of claim 15,
The organic nanoparticles are a mixture of first polymethyl methacrylate nanoparticles having an average particle diameter of 100 to 400 nm and second polymethyl methacrylate nanoparticles having an average particle diameter of 400 to 1000 nm. Virus blocking performance The manufacturing method of this excellent protective fabric. The method of claim 14,
The pore-forming additive is 50 to 300 parts by weight based on 100 parts by weight of the polyolefin-based resin. The method of claim 12,
The inorganic particles are any one or a mixture of two or more selected from calcium carbonate, talc, clay, kaolin, silica and diatomaceous earth having an average particle diameter of 0.5 to 10 µm. The method of claim 12,
The dry polyolefin-based breathable film is a method of manufacturing a protective clothing fabric having excellent virus blocking performance, which is manufactured by a blow casting method. The method of claim 12,
The protective clothing fabric has a thickness of 100 to 300 µm, a tensile strength of 100 N/50 mm or more according to ASTM D5034, an elongation of 40% or more, and a moisture permeability of 3000 g/m 2 ·24 hours or more according to ASTM E96, AATCC A method of manufacturing a protective fabric with excellent virus blocking performance with a water pressure of 300 mbar or more according to 127. As a protective clothing fabric with excellent virus blocking performance, a dry polyolefin-based breathable film is laminated on both sides of a wet polyolefin-based breathable film using a moisture-permeable polyurethane adhesive.
The wet polyolefin-based breathable film is a polyolefin-based resin mixed with a pore-forming additive, which is an organic nanoparticle having an average particle diameter of 100 to 1000 nm, is extruded and stretched, and then the pore-forming additive is extracted and removed, and has a thickness of 1 to 15 µm. , The moisture permeability according to ASTM E96 is 10000 to 22000 g/m²·24hr,
The dry polyolefin-based breathable film is prepared by extruding and stretching by mixing inorganic particles having an average particle diameter of 0.5 to 10 µm in a polyolefin-based resin, having a thickness of 15 to 30 µm, and a moisture permeability according to ASTM E96 of 8500 to 9500 g/ A protective fabric with excellent virus blocking performance of ㎡ · 24hr. The method of claim 21,
The inorganic particles are any one or a mixture of two or more selected from calcium carbonate, talc, clay, kaolin, silica and diatomaceous earth,
The organic nanoparticles are a mixture of first polymethyl methacrylate nanoparticles having an average particle diameter of 100 to 400 nm and second polymethyl methacrylate nanoparticles having an average particle diameter of 400 to 1000 nm. Virus blocking performance This excellent protective clothing fabric.

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