Classifications

• • A—HUMAN NECESSITIES
  • A41—WEARING APPAREL
  • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
  • A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
  • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
  • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
  • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary

Definitions

• the present invention relates to laminated nonwoven fabrics and protective clothing.
• protective clothing to prevent dirt.
• These protective clothing are required to have water resistance, dust resistance, strength, comfort when worn, and the like.
• protective clothing worn when removing or handling dust or chemical substances for example, is required to prevent dust or chemical substances from being absorbed by static electricity, or to prevent explosions caused by static electricity.
• the surface of clothing is treated to prevent static electricity from occurring.
• Patent Document 1 a moisture permeable/waterproof nonwoven fabric made of polyolefin ultrafine fibers, a thermoadhesive nonwoven fabric made of thermoplastic elastomer ultrafine fibers, and a rayon nonwoven fabric are compositely integrated, so that the side exposed to the outside air is
• a method is shown to provide a composite nonwoven fabric suitable for use in protective clothing, which exhibits moisture permeability and waterproofness, and has an excellent balance of performance such as strength, sweat absorption, and antistatic properties on the inside using a rayon nonwoven fabric. ing.
• Patent Document 2 discloses that by treating a synthetic fiber structure with an aqueous solution or aqueous dispersion containing a fluorine-based water repellent, a nonionic antistatic agent, and isopropyl alcohol, it has excellent alcohol repellency and oil repellency, and water resistance.
• Patent Document 3 discloses an antistatic protective fabric that has excellent antistatic properties and dust protection performance by laminating a fiber layer treated with an antistatic agent and a charged fiber layer. .
• the composite nonwoven fabric of Patent Document 1 is made by laminating nonwoven fabrics made of rayon, which is a hydrophilic material, and exhibits antistatic performance, but the antistatic performance is not necessarily sufficient to suppress the adsorption of dust and chemical substances caused by static electricity. Furthermore, when used in protective clothing, rayon nonwoven fabric has high water absorption, so there is a problem that the fabric sticks to the skin after sweating, impairing comfort during work.
• the synthetic fiber structure of Patent Document 2 has improved alcohol repellency, oil resistance, and water pressure resistance by treating the synthetic fiber structure with a fluorine-based water repellent and a nonionic antistatic agent.
• the synthetic fiber structure specifically manufactured uses a laminated nonwoven fabric, it is manufactured by immersing it in a treatment liquid containing a fluorine-based water repellent and a nonionic antistatic agent until the entire structure is impregnated. Since each layer that makes up the synthetic fiber structure is treated in the same way, the presence of the water repellent agent prevents the antistatic agent from fully absorbing water, but water itself is still absorbed to some extent, so water pressure resistance can be improved. In addition, there is a concern that the antistatic properties and high water pressure resistance may not be fully demonstrated due to the moisture content caused by the antistatic agent contained in the skin-side layer, which may increase stickiness to the skin.
• the antistatic dust protection fabric of Patent Document 3 has excellent antistatic properties, air permeability, and dust protection performance by laminating a fiber layer treated with an antistatic agent and a charged fiber layer. ing.
• moisture absorption tends to be accelerated in fiber layers treated with antistatic agents, and the absorbed moisture transfers to the charged fiber layer, reducing the water pressure resistance of the charged fiber layer.
• the inventors have discovered that there is a problem in that the water pressure resistance of the dust-proof and protective fabric also decreases, resulting in inferior waterproof properties.
• the present invention aims to provide a laminated nonwoven fabric and protective clothing that have excellent antistatic properties and waterproof properties, and also have excellent skin release properties.
• the present invention discloses the following laminated nonwoven fabric.
• a laminated nonwoven fabric having a first layer, a second layer, and a third layer in this order
• the first layer is a nonwoven fabric that constitutes the outermost layer on one side of the laminated nonwoven fabric
• the first layer contains an antistatic agent and a water repellent,
• the content of the antistatic agent is 0.02% by mass or more and 0.50% by mass or less based on the entire first layer
• the content of the water repellent agent is 0.02% by mass or more and 0.50% by mass or less based on the entire first layer
• the second layer is a nonwoven fabric,
• the average fiber diameter of the fibers constituting the second layer is 1.0 to 15.0 ⁇ m
• the second layer does not contain an antistatic agent, or even if it contains an antistatic agent,
• the content of the antistatic agent is less than 0.02% by mass based on the entire second layer
• the third layer is a nonwoven fabric that constitutes the outermost layer on the other side of the laminated nonwoven fabric,
• a laminated nonwoven fabric and protective clothing that have excellent antistatic properties and waterproof properties, and also have excellent skin release properties.
• the laminated nonwoven fabric of the present invention has a first layer, a second layer, and a third layer in this order.
• This first layer is a nonwoven fabric that constitutes the outermost layer on one side of the laminated nonwoven fabric of the present invention, and further contains an antistatic agent and a water repellent.
• the content of the above antistatic agent is 0.02% by mass or more and 0.50% by mass with respect to the entire first layer
• the content of the above water repellent is 0.02% by mass or more and 0.50% by mass with respect to the entire first layer. It is 0.02% by mass or more and 0.50% by mass or less with respect to the entire layer.
• the second layer is a nonwoven fabric, the average fiber diameter of the fibers constituting this second layer is 1.0 to 15.0 ⁇ m, and the second layer is made of an antistatic agent.
• the content of the antistatic agent is less than 0.02% by mass based on the entire second layer
• the third layer is the laminated layer of the present invention.
• the nonwoven fabric constitutes the outermost layer on the other side of the nonwoven fabric, and the fibers constituting this third layer are fibers made of olefin resin, and this third layer does not contain an antistatic agent, or Even if contained, the content of the above antistatic agent is less than 0.02% by mass with respect to the entire third layer, and the tensile strength measured based on JIS L1096-2010 is 15N or more. .
• the laminated nonwoven fabric of the present invention Due to the structure of the laminated nonwoven fabric of the present invention described above, the laminated nonwoven fabric of the present invention has excellent antistatic properties and waterproof properties, and also has excellent skin release properties.
• the mechanism by which the above effects are obtained is presumed to be as follows.
• the first layer contains a specific amount of antistatic agent
• the second layer does not contain antistatic agent, or even if it does, it contains only a very small amount of antistatic agent.
• the laminated nonwoven fabric has excellent antistatic properties and waterproof properties.
• the antistatic agent adsorbs moisture in the air, thereby decreasing the surface electrical resistance value and exhibiting antistatic properties.
• containing an antistatic agent makes it easier to draw moisture into the laminated nonwoven fabric, promoting water permeation from the outermost surface of the laminated nonwoven fabric to one of the outermost surfaces, thereby reducing waterproofness.
• a water repellent exhibiting hydrophobicity is contained in the first layer together with an antistatic agent, which prevents water from permeating from the surface to the inside of the laminated nonwoven fabric.
• the fine second layer does not contain an antistatic agent, or even if it contains it, it is only in a very small amount, thereby suppressing moisture from penetrating into the second layer, which is difficult to penetrate.
• the third layer with a tensile strength of 15N or more on the second layer with fine mesh openings, when water pressure is applied from one side of the laminated nonwoven fabric to the other side, Also, the laminated nonwoven fabric is difficult to deform, and breakage of the second layer is suppressed, resulting in improved water pressure resistance and excellent waterproof properties.
• the third layer must not contain an antistatic agent, or if it does contain it, it will only be in a very small amount, and it must be made of an olefin resin that has a low moisture content, that is, it is less likely to absorb moisture in the air. Being composed of fibers makes it difficult for the surface of the laminated nonwoven fabric to absorb moisture, resulting in excellent skin release properties.
• the laminated nonwoven fabric of the present invention has excellent antistatic properties and waterproof properties, and also has excellent skin release properties.
• the laminated nonwoven fabric of the present invention may be composed of only the first layer, the second layer, and the third layer, or the laminated nonwoven fabric of the present invention may be composed of only the first layer, the second layer, and the third layer. It may contain layers other than the second layer and the third layer.
• layers other than the first layer, second layer, and third layer can be exemplified by layers such as film layers, woven fabrics, and knitted fabrics. Examples include layer/film layer/second layer/third layer.
• the laminated nonwoven fabric of the present invention has better air permeability, and the number of steps in the manufacturing process of the laminated nonwoven fabric can be reduced, resulting in excellent productivity of the laminated nonwoven fabric. is preferably composed of only a first layer, a second layer, and a third layer.
• the first, second, and third layers can be laminated using, for example, hot embossing rolls with engravings (irregularities) on the surfaces of a pair of upper and lower rolls, or hot embossing rolls with a flat (smooth) roll surface.
• hot embossing rolls with engravings (irregularities) on the surfaces of a pair of upper and lower rolls or hot embossing rolls with a flat (smooth) roll surface.
• thermal bonding using various rolls, such as heat embossing rolls, which are a combination of a roll and a roll with engravings (irregularities) on the roll surface, and heat calender rolls, which are a combination of a pair of upper and lower flat (smooth) rolls.
• a method such as ultrasonic bonding in which heat welding is performed by ultrasonic vibration of a horn can be employed.
• a heat embossing roll consisting of a combination of a roll with a flat (smooth) roll surface and a roll with engravings (irregularities) on the roll surface is preferably used.
• the surface electrical resistance value of one side of the laminated nonwoven fabric is 2.5 ⁇ 10 9 ⁇ or less as measured in accordance with EN1149-1-2006.
• a surface electrical resistance value of 2.5 x 10 9 ⁇ or less when a part of the first layer comes into contact with another part of the first layer and wears out when using a laminated nonwoven fabric or protective clothing, It is also possible to suppress charging due to static electricity generated when the layer comes into contact with something other than the first layer and is abraded.
• the water pressure resistance of the laminated nonwoven fabric measured based on JIS L1092-2009 is preferably 1000 mmH 2 O (9.8 kN/m 2 ) or more, more preferably 1500 mm H 2 O (14.7 kN/m 2 ). preferable.
• 1000 mmH 2 O (9.8 kN/m 2 ) or more it becomes possible to prevent liquid that has come into contact with the laminated nonwoven fabric from penetrating or permeating when pressure is applied.
• the wet friction force of the other surface of the laminated nonwoven fabric is 0.7 N or less, and more preferably 0.5 N or less, as measured based on JIS K7125-1999.
• the wet friction force is 0.7 N or less, it is not sticky when it comes into contact with the skin, satisfies good skin release properties, and provides comfort during work.
• the air permeability of the laminated nonwoven fabric measured according to JIS L1913-2010 is preferably 5 cm 3 /cm 2 /sec or more, more preferably 10 cm 3 /cm 2 /sec or more. 5 cm 3 /cm 2 /sec or more, when the laminated nonwoven fabric is used as protective clothing, the air on the wearer's side and the outside side, which is separated by the laminated nonwoven fabric, can be efficiently replaced, so the temperature and humidity of the protective clothing can be reduced. This makes it possible to suppress the increase in wear and provide excellent wearing comfort.
• the air permeability of laminated nonwoven fabrics it is generally a physical property that correlates with water pressure resistance, and as the air permeability increases, water pressure resistance decreases. It is preferable that it is 200 cm 3 /cm 2 /sec or less.
• the laminated nonwoven fabric of the present invention can be used for protective clothing.
• a laminated nonwoven fabric in protective clothing it is possible to prevent static electricity generated on the surface of the protective clothing during work, and at the same time, it has excellent release properties from the skin when sweating, making it comfortable to wear.
• the first layer is arranged to constitute the outer surface of the protective clothing
• the third layer is arranged to constitute the inner surface of the protective clothing. It is preferable that they are arranged as follows. By arranging the first layer so as to constitute the outer surface of the protective clothing, it is possible to obtain an excellent value of surface electrical resistance, which is an index of antistatic performance.
• the third layer is arranged to constitute the inner surface of the protective clothing, the fabric can be easily removed from the skin after sweating, and it can be used more easily during work. You can get comfort.
• the first layer of the laminated nonwoven fabric of the present invention constitutes the outermost layer on one side of the laminated nonwoven fabric, and is a nonwoven fabric containing an antistatic agent and a water repellent at 0.02% by mass or more and 0.50% by mass or less, respectively. It is.
• the first layer containing a specific amount of an antistatic agent and a water repellent agent constitutes the outermost layer of the laminated nonwoven fabric, thereby increasing the value of surface electrical resistance, which is an index of the antistatic performance of the outermost layer of the laminated nonwoven fabric. In addition to improving the water pressure resistance of the laminated nonwoven fabric, it also has excellent waterproof properties.
• the fiber material constituting the first layer examples include polyolefin resins (e.g., polyethylene, polypropylene, copolymers of ethylene and ⁇ -olefins, copolymers of propylene and ⁇ -olefins, etc.), styrene resins, etc.
• polyolefin resins e.g., polyethylene, polypropylene, copolymers of ethylene and ⁇ -olefins, copolymers of propylene and ⁇ -olefins, etc.
• styrene resins e.g., polystyrene resins, etc.
• Resins e.g., polystyrene, acrylonitrile styrene resin, etc.
• polyether resins e.g., polyetheretherketone, polyacetal, modified polyphenylene ether, aromatic polyetherketone, etc.
• polyester resins e.g., polyethylene terephthalate, polytrimethylene
• polybutylene terephthalate polyethylene naphthalate, polybutylene naphthalate, polycarbonate, polyarylate, aromatic polyester resin, etc.
• polyimide resin polyamideimide resin
• polyamide resin e.g.
• aromatic polyamide resin aromatic polyether (amide resin, nylon resin, etc.), urethane resin, epoxy resin, polysulfone resin (e.g., polysulfone, polyethersulfone, etc.), fluorine resin (e.g., polytetrafluoroethylene, polyvinylidene fluoride, etc.), cellulose resin.
• polybenzimidazole resin acrylic resin (for example, polyacrylonitrile resin copolymerized with acrylic ester or methacrylic ester, modacrylic resin copolymerized with acrylonitrile and vinyl chloride or vinylidene chloride, etc.).
• polyolefin resins are preferred from the viewpoint of productivity and excellent texture of the laminated nonwoven fabric, and among polyolefin resins, polypropylene is particularly preferred from the viewpoint of high mechanical strength.
• nonwoven fabrics include spunbond nonwoven fabrics and meltblown nonwoven fabrics, and among these, spunbond nonwoven fabrics are preferred because of their high productivity, strength, and air permeability.
• the first layer contains an antistatic agent in an amount of 0.02% by mass or more and 0.50% by mass or less.
• the antistatic agent is a compound having an antistatic function, and includes cationic antistatic agents, amphoteric antistatic agents, and anionic antistatic agents.
• cationic antistatic agents include quaternary ammonium salt compounds and acetate compounds of aliphatic amines
• amphoteric antistatic agents include betaine compounds, carboxymethylamine compounds, and imidazolium compounds.
• anionic antistatic agents include sulfuric acid ester compounds, sulfonic acid compounds, and phosphoric acid ester compounds.
• the antistatic agent is preferably an anionic antistatic agent, and more preferably a phosphate ester compound, from the standpoint of being able to lower the surface electrical resistance, which is an index of antistatic performance.
• the fibers themselves may be subjected to antistatic treatment by kneading an antistatic agent into the fibers constituting the first layer.
• Antistatic treatment may be performed by coating the first layer with a coating agent containing an antistatic agent.
• antistatic processing by dipping treatment is preferred because it easily lowers the surface electrical resistance, which is antistatic performance, and has high productivity.
• the antistatic agent has a structure that has a hydrophobic group that is compatible with oil and a hydrophilic group that is compatible with water.
• the hydrophilic group of the antistatic agent absorbs moisture in the air, and the antistatic agent contains It is believed that this reduces the surface electrical resistance value and exhibits excellent antistatic properties, but at the same time, it tends to draw moisture into the laminated nonwoven fabric, promoting water permeation and reducing waterproofness.
• the amount of the antistatic agent contained in the first layer is 0.02% by mass or more and 0.50% by mass or less.
• the amount of antistatic agent contained in the first layer is 0.02% by mass or more and 0.50% by mass or less.
• the surface electrical resistance which is an index of antistatic performance.
• antistatic agents have the effect of adsorbing moisture in the air and lowering the surface electrical resistance, they tend to draw moisture into the interior of the nonwoven fabric, lowering its water pressure resistance and reducing its waterproof properties.
• a decrease in water pressure resistance can be suppressed.
• the first layer is a nonwoven fabric containing 0.02% by mass or more and 0.50% by mass or less of a water repellent.
• the water repellent is not particularly limited as long as it can exhibit water repellency, but examples include silicone water repellents, fluorine water repellents, wax water repellents, and hydrocarbon water repellents. It will be done. Among these, silicone-based water repellents are preferred from the viewpoints of water repellency, durable water repellency and water repellency when attached to fibers, and texture of textile products.
• water repellent agent As a processing method for the water repellent agent, conventionally known techniques can be used within the range that does not impair the effects of the present invention.
• a dipping treatment may be performed, or a water repellent agent may be kneaded into the fibers constituting the first layer to perform a water repellent treatment on the fibers themselves.
• Water repellent treatment may be performed by coating the first layer with a coating agent containing a water repellent. Among these, water-repellent finishing by dipping is preferred because of its high productivity.
• the above-mentioned water repellent has a lower liquid tension on the solid surface than water and easily repels water, and that it is possible to suppress water penetration into the interior of the laminated nonwoven fabric by containing the water repellent in the fibers.
• adsorption of water to the surface of the laminated nonwoven fabric is inhibited, and the surface electrical resistance value, which is an index of antistatic performance, tends to increase.
• the amount of water repellent contained in the first layer is 0.02% by mass or more and 0.50% by mass or less.
• the hydrophobic effect of the water repellent agent suppresses water on the surface of the first layer from penetrating into the laminated nonwoven fabric, improving the water pressure resistance of the laminated nonwoven fabric, resulting in excellent waterproof properties. It becomes something.
• the content of the water repellent in the first layer is 0.50% by mass or less, the water repellent inhibits the adsorption of water to the surface of the laminated nonwoven fabric, and is an indicator of antistatic performance. It is possible to suppress a certain increase in surface electrical resistance.
• the antistatic agent adsorbs moisture in the air on the fiber surface and exhibits antistatic performance, but the hydrophilicity of the fiber surface increases, reducing the water pressure resistance of the laminated nonwoven fabric and reducing its waterproof property.
• water repellents are hydrophobic, they improve water pressure resistance, but the hydrophobicity of the fiber surface increases, inhibiting the adsorption of moisture in the air necessary for antistatic performance to occur, and causing static buildup. Prevention is reduced.
• the laminated nonwoven fabric can have both excellent antistatic properties and waterproof properties.
• the basis weight of the first layer is not particularly limited as long as the strength is ensured, and is preferably 5 to 40 g/m 2 .
• the basis weight of the first layer is not particularly limited as long as the strength is ensured, and is preferably 5 to 40 g/m 2 .
• the first layer can be provided with functions within a range that does not impair the effects of the present invention, such as flame retardant, antibacterial, and antifungal functions.
• the second layer of the laminated nonwoven fabric of the present invention does not contain an antistatic agent, or even if it does, the content of the antistatic agent is less than 0.02% by mass, and the average fiber diameter is 1.0 to 15%. It is a nonwoven fabric of .0 ⁇ m.
• the material of the fibers constituting the second layer of the laminated nonwoven fabric of the present invention is the same as the material of the fibers constituting the first layer.
• the second layer is a nonwoven fabric.
• this nonwoven fabric is exemplified by a spunbond nonwoven fabric or a meltblown nonwoven fabric, but from the viewpoint of having excellent uniformity in basis weight and uniformity in fiber dispersion, fibers with fine fineness are It is preferable that it is a melt-blown nonwoven fabric composed of.
• the average fiber diameter of the fibers constituting the second layer is 1.0 to 15.0 ⁇ m.
• the second layer is disposed between the first layer and the third layer, and further, the first layer contains a specific amount of water repellent.
• the water pressure resistance of the laminated nonwoven fabric of the invention is extremely high, and the waterproof property of this laminated nonwoven fabric is extremely excellent.
• the average fiber diameter is 1.0 ⁇ m or more, sufficient strength can be obtained without causing poor handling. Further, it is more preferably in the range of 1 to 3 ⁇ m.
• the content of the antistatic agent in the second layer is less than 0.02% by mass. That is, the second layer does not contain an antistatic agent, or even if it contains it, it contains only a very small amount.
• the preferred type of antistatic agent is the same as the antistatic agent contained in the first layer. By setting the amount of the antistatic agent contained in the second layer to less than 0.02% by mass, the intrusion of moisture from the surface of the laminated nonwoven fabric to the second layer is suppressed, and the water pressure resistance of the laminated nonwoven fabric is improved. Provides excellent waterproof properties.
• the method of processing the antistatic agent is the same as the method of processing the antistatic agent of the first layer.
• the second layer preferably has a basis weight of 1 to 30 g/m 2 .
• the basis weight of the second layer By setting the basis weight of the second layer to 1 g/m 2 or more, the water pressure resistance of the laminated nonwoven fabric is improved, and the laminated nonwoven fabric has excellent waterproof properties.
• the basis weight of the second layer By setting the basis weight of the second layer to 30 g/m 2 or less, the laminated nonwoven fabric has excellent air permeability.
• the second layer can be provided with functions within a range that does not impair the effects of the present invention, such as flame retardant, antibacterial, and antifungal functions.
• the third layer of the laminated nonwoven fabric of the present invention constitutes the outermost layer on the other side of the laminated nonwoven fabric, and does not contain an antistatic agent, or even if it does contain an antistatic agent, the content of the antistatic agent is 0.02% by mass.
• the nonwoven fabric is made of fibers made of polyolefin resin and has a tensile strength of 15N or more.
• the content of the antistatic agent in the third layer is less than 0.02% by mass. That is, the third layer does not contain an antistatic agent, or even if it contains it, it contains only a very small amount.
• the preferred type of antistatic agent is the same as the antistatic agent contained in the first layer. As mentioned above, since the antistatic agent adsorbs moisture in the air, if the third layer contains a large amount of the antistatic agent, the third layer will contain moisture. When a laminated nonwoven fabric is used in such a way that the third layer is in direct contact with the skin, the moisture-containing third layer becomes more sticky to the skin, which tends to worsen the ability of the laminated nonwoven fabric to release from the skin. can be seen.
• the third layer is prevented from containing moisture, so when the third layer comes into contact with the skin,
• the laminated nonwoven fabric is not sticky and has good release properties from the skin, and protective clothing using this laminated nonwoven fabric with the third layer placed on the wearer's side provides excellent comfort during work.
• the method of processing the antistatic agent is the same as the method of processing the antistatic agent of the first layer.
• the fibers constituting the third layer are fibers made of olefin resin.
• polyolefin resins such as polyethylene and polypropylene have low hygroscopicity, which prevents the third layer from containing moisture. Therefore, the laminated non-woven fabric has excellent release properties from the skin after sweating, and protective clothing using this laminated non-woven fabric with the third layer placed on the wearer's side is You can get a high level of comfort while working.
• the third layer may contain fibers other than fibers made of polyolefin resin. Examples of fibers other than fibers made of polyolefin resin include polyamide fibers and polyester fibers. Further, the content of fibers made of polyolefin resin in the third layer is preferably 90% by mass based on the entire third layer.
• the third layer is a nonwoven fabric.
• nonwoven fabric examples include spunbond nonwoven fabric and meltblown nonwoven fabric, and among these, spunbond nonwoven fabric is preferred because of its high productivity, strength, and air permeability.
• the tensile strength of the third layer measured based on JIS L1096-2010 is 15N or more.
• the high density suppresses breakage of the second layer, which contributes to the high waterproofness of the laminated nonwoven fabric, and as a result, the water pressure resistance of the laminated nonwoven fabric improves, resulting in excellent waterproofness.
• the basis weight of the third layer is not particularly limited as long as the tensile strength is ensured, and a weight of 5 to 40 g/m 2 is preferably used.
• the third layer can be provided with functions within a range that does not impair the effects of the present invention, such as flame retardant, antibacterial, and antifungal functions.
• Measureing method (1) Based on JIS L1096-2010, take two test pieces of 200 mm x 200 mm, weigh the mass (g) of each, calculate the mass (g/m 2 ) per unit area (1 m 2 ), and Calculate the average value.
• the water pressure resistance of the laminated nonwoven fabric was measured based on the JIS L1092-2009 low water pressure method, by applying water pressure to the test piece at a pressure increase rate of 60 cm/min, and measuring the water pressure when 3 water droplets came out. The average value of three measurements was taken as the water pressure resistance.
• Frictional force when wet (written as "frictional resistance force when wet” in the table)
• the skin release property was evaluated using the first layer of the laminated nonwoven fabric as the measurement surface and the friction force when wet.
• the wet friction force was measured in accordance with JIS K 7125-1999 "Plastics - Films and sheets - Friction coefficient test method".
• a sample cut to 6 cm x 12 cm was placed on a horizontal stainless steel plate, a load of 200 gf (1.96 N) was applied to the sample in an area of 40 cm 2 , and then a tensile test machine was applied from one side.
• the dynamic friction force when pulled at a pulling speed of 10 cm/min was measured.
• water equivalent to 50% of the weight of the sample was uniformly applied to the entire sample.
• Air permeability The air permeability of the laminated nonwoven fabric was measured based on the JIS L1913-2010 Frazier method, and the amount of air passing through a test piece measuring 15 cm x 15 cm. The average value of the three measurements of the amount of air passing through the tube was taken as the air permeability.
• the surface electrical resistance of the antistatic dust protection fabric is measured based on EN1149-1-2006 using the first layer as the measurement surface, and the surface electrical resistance obtained with a test piece of 12 cm x 12 cm in size. value.
• the peak area obtained from the solvent extract of the first layer is compared with the calibration curve, the amount of antistatic agent and water repellent agent adhering to the first layer is calculated, and the amount of antistatic agent and water repellent agent adhering to the first layer is calculated.
• the value obtained by dividing by the weight of the layer was rounded to the third decimal place to obtain the drug content (mass %) of the first layer.
• Average fiber diameter Cutting was performed using a microtome along a plane perpendicular to the plane of the laminated nonwoven fabric.
• the cut surface of the laminated nonwoven fabric was photographed at 500x and 1000x magnification using a field emission scanning electron microscope (FE-SEM) S-800 manufactured by Hitachi, Ltd. These images were imported into the image analysis software included with this device.
• FE-SEM field emission scanning electron microscope
• the fiber diameter is measured using an SEM image measured at a magnification of 500 times, and for fibers with a fiber diameter of 10 ⁇ m or more, an SEM image measured at a magnification of 1000 times.
• the fiber diameter was measured using Specifically, 15 fibers constituting the second layer were randomly selected from the second layer shown in the SEM image, and the fiber diameters of these fibers were measured. Then, the average of the obtained 15 measured values was taken as the average fiber diameter of the fibers constituting the second layer. The fiber diameter of the fiber was determined by reading the fiber diameter in micrometers to the second decimal place and rounding the value to the second decimal place.
• the laminated nonwoven fabric was created as follows.
• Example 1 An anionic antistatic agent (“ZELEC” (registered trademark) TY manufactured by STEPAN) and a silicone water repellent (“Drypon (registered trademark)” 600E manufactured by NICCA Chemical Co., Ltd.) were added to the drug formulation A shown in Table 1.
• the polypropylene spunbond nonwoven fabric A having an average fiber diameter of 25.0 ⁇ m, 20 g/m 2 and a tensile strength of 25 N was subjected to mangling treatment.
• the spunbond nonwoven fabric after the mangling process was dried for 1 minute at 135° C. using a pin tenter to obtain a spunbond nonwoven fabric A1, which was used as the first layer.
• a polypropylene melt-blown nonwoven fabric A having an average fiber diameter of 1.6 ⁇ m and a basis weight of 15 g/m 2 was used.
• polypropylene spunbond nonwoven fabric A having an average fiber diameter of 25.0 ⁇ m, 20 g/m 2 and a tensile strength of 25 N was used.
• the first layer, second layer, and third layer were laminated in this order, and the layers were integrated using an embossing device at a temperature of 120° C., a pressure of 60 kg/m 2 , and a speed of 10 m/min to obtain a laminated nonwoven fabric.
• Table 2 shows the layer structure of Example 1 and the surface electrical resistance, water pressure resistance, frictional force when wet, and air permeability of the laminated nonwoven fabric.
• Examples 2 to 5 Spunbond nonwoven fabrics A2 to A5 were obtained using spunbond nonwoven fabric A, an anionic antistatic agent, and a silicone water repellent in the same manner except that the drug formulation in Example 1 was changed to Prescriptions B, C, D, and E. . Further, laminated nonwoven fabrics of Examples 2 to 5 were obtained in the same manner as in Example 1 except that spunbond nonwoven fabrics A2 to A5 were used instead of spunbond nonwoven fabric A1. Table 2 shows the layer configurations of the obtained Examples 2 to 5, and the surface electrical resistance, water pressure resistance, frictional force when wet, and air permeability of the laminated nonwoven fabrics.
• Example 6 An anionic antistatic agent was mixed with pure water according to the drug formulation I shown in Table 1, and a polypropylene melt-blown nonwoven fabric A having an average fiber diameter of 1.6 ⁇ m and a basis weight of 15 g/m 2 was subjected to mangling treatment. The melt-blown nonwoven fabric after the mangling treatment was dried for 1 minute at 135° C. using a pin tenter to obtain a melt-blown nonwoven fabric A1. Furthermore, a laminated nonwoven fabric of Example 6 was obtained in the same manner as in Example 1 except that the melt-blown nonwoven fabric A1 was used as the second layer. Table 2 shows the layer structure of Example 6 and the surface electrical resistance, water pressure resistance, frictional force when wet, and air permeability of the laminated nonwoven fabric.
• Example 7 A laminated nonwoven fabric of Example 7 was obtained in the same manner as in Example 1 except that polypropylene melt-blown nonwoven fabric B having an average fiber diameter of 12.2 ⁇ m and a basis weight of 15 g/m 2 was used as the second layer.
• Table 2 shows the layer structure of Example 7 and the surface electrical resistance, water pressure resistance, frictional force when wet, and air permeability of the laminated nonwoven fabric.
• Example 8 An anionic antistatic agent was mixed with pure water according to the drug formulation I shown in Table 1, and a polypropylene spunbond nonwoven fabric A having an average fiber diameter of 25.0 ⁇ m, 20 g/m 2 and a tensile strength of 25 N was subjected to mangling treatment. .
• the polypropylene spunbond nonwoven fabric after the mangling treatment was dried for 1 minute at 135° C. using a pin tenter to obtain a spunbond nonwoven fabric A9.
• a laminated nonwoven fabric of Example 8 was obtained in the same manner as in Example 1 except that spunbond nonwoven fabric A9 was used as the third layer.
• Table 2 shows the layer structure of Example 8 and the surface electrical resistance, water pressure resistance, frictional force when wet, and air permeability of the laminated nonwoven fabric.
• Example 9 A laminated nonwoven fabric of Example 9 was obtained in the same manner as in Example 1, except that polypropylene spunbond nonwoven fabric B having an average fiber diameter of 35.0 ⁇ m, 20 g/m 2 and a tensile strength of 16 N was used for the third layer.
• Table 3 shows the layer structure of Example 9 and the surface electrical resistance, water pressure resistance, frictional force when wet, and air permeability of the laminated nonwoven fabric.
• Examples 10 and 11 A spunbond nonwoven fabric A, a cationic antistatic agent (“Osmoline” (registered trademark) DA-50 manufactured by Sanyo Kasei Co., Ltd.), and a fluorine-based water repellent were prepared in the same manner, except that the drug formulation in Example 1 was changed to Prescriptions F and G. (“Unidyne” (registered trademark) XF-5007 manufactured by Daikin) to obtain spunbond nonwoven fabrics A6 and A7. Further, laminated nonwoven fabrics of Examples 10 and 11 were obtained in the same manner as in Example 1 except that spunbond nonwoven fabrics A6 to A7 were used instead of spunbond nonwoven fabric A1. Table 3 shows the layer structure of Examples 10 and 11 and the surface electrical resistance, water pressure resistance, frictional force when wet, and air permeability of the laminated nonwoven fabrics.
• Example 12 Spunbond nonwoven fabrics A11 and A12 were obtained in the same manner except that the drug formulation of Example 1 was changed to formulations K and L using spunbond nonwoven fabric A, an anionic antistatic agent, and a silicone water repellent, respectively. Further, laminated nonwoven fabrics of Examples 12 to 13 were obtained in the same manner as in Example 1, except that spunbond nonwoven fabric A1 was replaced with spunbond nonwoven fabrics A11 and A12, respectively. Table 3 shows the layer configurations of the obtained Examples 12 and 13, and the surface electrical resistance, water pressure resistance, frictional force when wet, and air permeability of the laminated nonwoven fabrics.
• Example 1 A spunbond nonwoven fabric A8 was obtained in the same manner except that the drug formulation of Example 1 was changed to prescription H, using spunbond nonwoven fabric A, an anionic antistatic agent, and a silicone water repellent. Furthermore, a laminated nonwoven fabric of Comparative Example 1 was obtained in the same manner as in Example 1 except that spunbond nonwoven fabric A8 was replaced with spunbond nonwoven fabric A8. Table 4 shows the layer structure of Comparative Example 1 and the surface electrical resistance, water pressure resistance, frictional force when wet, and air permeability of the laminated nonwoven fabric.
• the first layer, second layer, and third layer were laminated in this order, and the layers were integrated using an embossing device at a temperature of 120° C., a pressure of 60 kg/m 2 , and a speed of 10 m/min to obtain a laminated nonwoven fabric.
• Table 4 shows the layer structure of Comparative Example 2 obtained, and the surface electrical resistance, water pressure resistance, frictional force when wet, and air permeability of the laminated nonwoven fabric.
• melt-blown nonwoven fabric A2 was obtained in the same manner except that drug formulation I in Example 6 was changed to prescription J using melt-blown nonwoven fabric A and an anionic antistatic agent. Furthermore, a laminated nonwoven fabric of Comparative Example 3 was obtained in the same manner as in Example 6 except that meltblown nonwoven fabric A2 was replaced with meltblown nonwoven fabric A1. Table 4 shows the layer structure of Comparative Example 4, and the surface electrical resistance, water pressure resistance, frictional force when wet, and air permeability of the laminated nonwoven fabric.
• Comparative example 4 A laminated nonwoven fabric of Comparative Example 4 was obtained in the same manner as in Example 7 except that polypropylene melt-blown nonwoven fabric C having an average fiber diameter of 21.2 ⁇ m and a basis weight of 15 g/m 2 was used as the second layer.
• Table 4 shows the layer structure of the obtained comparative example 4, and the surface electrical resistance, water pressure resistance, and frictional force when wet of the laminated nonwoven fabric.
• a spunbond nonwoven fabric A10 was obtained in the same manner except that drug formulation I in Example 8 was changed to formulation J using spunbond nonwoven fabric A and an anionic antistatic agent. Furthermore, a laminated nonwoven fabric of Comparative Example 5 was obtained in the same manner as in Example 6 except that spunbond nonwoven fabric A9 was changed to spunbond nonwoven fabric A10. Table 4 shows the layer structure of Comparative Example 5 obtained, and the surface electrical resistance, water pressure resistance, frictional force when wet, and air permeability of the laminated nonwoven fabric.
• ⁇ Comparative example 6> A laminated nonwoven fabric of Comparative Example 6 was obtained in the same manner as in Example 9, except that polypropylene spunbond nonwoven fabric C having an average fiber diameter of 14.0 ⁇ m, 20 g/m 2 and a tensile strength of 12 N was used for the third layer. Table 4 shows the layer structure of Comparative Example 6 and the surface electrical resistance, water pressure resistance, frictional force when wet, and air permeability of the laminated nonwoven fabric.
• ⁇ Comparative Examples 7 to 9> Spunbond nonwoven fabrics A13, A14, and A15 were obtained using spunbond nonwoven fabric A, an anionic antistatic agent, and a silicone water repellent in the same manner except that the drug formulation of Example 1 was changed to formulations M, N, and O.
• laminated nonwoven fabrics of Comparative Examples 7 to 9 were obtained in the same manner as in Example 1, except that spunbond nonwoven fabric A was replaced with spunbond nonwoven fabrics A13, A14, and A15.
• Table 4 shows the layer structure of the obtained Comparative Examples 7 to 9, and the surface electrical resistance, water pressure resistance, frictional force when wet, and air permeability of the laminated nonwoven fabric.
• a laminated nonwoven fabric and protective clothing that have excellent antistatic properties, waterproof properties, and breathability, and also have good release properties from the skin.

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• 2023
  • 2023-03-08 JP JP2023515827A patent/JPWO2023181940A1/ja active Pending
  • 2023-03-08 WO PCT/JP2023/008767 patent/WO2023181940A1/ja not_active Ceased

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