Infrared-absorbing fiber structure having quick-drying properties and garment using same

Abstract

The problem to be solved by the invention is to provide an infrared-absorbing fibrous structure capable of realizing a quick-drying property without depending on a single filament cross-sectional shape of a fiber constituting a fibrous structure, and a garment comprising the same. The present invention is an infrared-absorbing fibrous structure formed by processing an infrared-absorbing fiber comprising infrared-absorbing material fine particles selected from tungsten oxide fine particles represented by a general formula WOX (W is tungsten, O is oxygen, 2.45 ≤ X ≤ 2.999) or composite tungsten oxide fine particles represented by a general formula MYWOZ (element M is an element selected from Cs, Rb, K, Tl, In, etc., 0.001 ≤ Y ≤ 1.0, 2.2 ≤ Z ≤ 3.0) on a surface and / or in an interior thereof, characterized in that a particle size of the fine particles is 1 nm or more and 200 nm or less, and a content of the fine particles per unit area of the structure is 0.05 g / m2 or more and 8.0 g / m2 or less; the infrared-absorbing material fine particles having absorbed solar energy generate heat, whereby drying of moisture contained in the structure can be promoted.

Description

TECHNICAL FIELD

[0001] The present invention relates to an infrared-absorbing fibrous structure, such as a woven fabric, a knitted fabric, or a nonwoven fabric, formed by processing an infrared-absorbing fiber containing infrared-absorbing material fine particles selected from tungsten oxide fine particles or composite tungsten oxide fine particles on a surface and / or in an interior thereof, and a garment such as sports underwear or swimwear comprising the infrared-absorbing fibrous structure, and particularly relates to improvement of an infrared-absorbing fibrous structure excellent in quick-drying property and a garment.BACKGROUND ART

[0002] In garments such as sports underwear and swimwear, discomfort during perspiration and discomfort in which a wet state continues have conventionally been regarded as problems. This problem is a problem that discomfort associated with a chilling sensation occurs because the drying property of a fibrous structure used for a garment such as sports underwear or swimwear is poor.

[0003] In order to improve the drying property of a fibrous structure, use of a hydrophobic synthetic fiber such as a polyester fiber or a polyamide fiber has conventionally been widely performed, but a drying speed as much as expected has not been obtained, and it has been insufficient to eliminate a chilling sensation or discomfort when wet.

[0004] Therefore, in order to eliminate this problem, Patent Literature 1 discloses a core-sheath type composite structure textured yarn composed of two types of polyester-based multifilaments and a fabric using the same for the purpose of a quick-drying property. According to Patent Literature 1, although a single filament cross-sectional shape of the polyester-based multifilament used for a core portion of the core-sheath type composite structure textured yarn is basically arbitrary, the single filament cross-sectional shape of the core portion is considered to affect the quick-drying property, and it is described that when the single filament cross-sectional shape of the polyester-based multifilament is made into a round cross section, diffusibility and a quick-drying property of the fiber are obtained (refer to paragraph 0018).CITATION LISTPATENT LITERATURES

[0005] Patent Literature 1: Japanese Unexamined Patent Application Publication No. 2010-174424SUMMARY OF THE INVENTIONTECHNICAL PROBLEM

[0006] However, the single filament cross-sectional shape of the polyester-based multifilament used for the core portion also affects the texture of the obtained fabric or the like, and for example, in a polyester fiber, it is also known that gloss increases by forming the single filament cross-sectional shape into a Y-shape.

[0007] For this reason, when the single filament cross-sectional shape of the polyester-based multifilament is formed into a round cross section so that diffusibility and a quick-drying property of the polyester fiber can be obtained, there has existed a problem that other characteristics such as gloss cannot be obtained.

[0008] The present invention has been made paying attention to such a problem, and an object thereof is to provide an infrared-absorbing fibrous structure capable of realizing a quick-drying property without depending on a single filament cross-sectional shape of a fiber constituting a fibrous structure such as a woven fabric, a knitted fabric, or a nonwoven fabric, and a garment comprising the same.SOLUTION TO PROBLEM

[0009] That is, a first invention according to the present invention is an infrared-absorbing fibrous structure having a quick-drying property formed by processing an infrared-absorbing fiber comprising one or more infrared-absorbing material fine particles selected from tungsten oxide fine particles or composite tungsten oxide fine particles on a surface and / or in an interior thereof, wherein a particle size of the infrared-absorbing material fine particles is 1 nm or more and 200 nm or less, and a content of the infrared-absorbing material fine particles per unit area of the infrared-absorbing fibrous structure is 0.05 g / m 2< or more and 8.0 g / m 2< or less.

[0010] Further, a second invention according to the present invention is the infrared-absorbing fibrous structure having a quick-drying property according to the first invention, wherein the tungsten oxide fine particle, when selected, is a tungsten oxide fine particle represented by a general formula WO X (provided that W is tungsten, O is oxygen, and 2.45 ≤ X ≤ 2.999), and the composite tungsten oxide fine particle, when selected, is a composite tungsten oxide fine particle represented by a general formula M Y WO Z (provided that the element M is one or more kinds of elements selected from H, He, alkali metals, alkaline earth metals, rare earth elements, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, and I, W is tungsten, O is oxygen, 0.001 ≤ Y ≤ 1.0, and 2.2 ≤ Z ≤ 3.0) and having a hexagonal crystal structure; a third invention is the infrared-absorbing fibrous structure having a quick-drying property according to the second invention, wherein the element M of the composite tungsten oxide fine particle is one or more kinds of elements selected from Cs, Rb, K, Tl, In, Ba, Li, Ca, Sr, Fe, and Sn; and a fourth invention is the infrared-absorbing fibrous structure having a quick-drying property according to the first invention or the second invention, further comprising far-infrared radiating substance fine particles on the surface and / or in the interior of the infrared-absorbing fiber, wherein a content of the far-infrared radiating substance fine particles per unit area of the infrared-absorbing fibrous structure is 0.10 g / m 2< or more.

[0011] Next, a fifth invention according to the present invention is the infrared-absorbing fibrous structure having a quick-drying property according to the first invention or the second invention, wherein the infrared-absorbing fiber is a fiber selected from any of a synthetic fiber, a semi-synthetic fiber, a natural fiber, a regenerated fiber, an inorganic fiber, or a mixed yarn of these fibers obtained by blending, plying, or commingling; a sixth invention is the infrared-absorbing fibrous structure having a quick-drying property according to the fifth invention, wherein the synthetic fiber is any synthetic fiber selected from a polyurethane fiber, a polyamide-based fiber, an acrylic-based fiber, a polyester-based fiber, a polyolefin-based fiber, a polyvinyl alcohol-based fiber, a polyvinylidene chloride-based fiber, a polyvinyl chloride-based fiber, and a polyether ester-based fiber; a seventh invention is the infrared-absorbing fibrous structure having a quick-drying property according to the sixth invention, wherein the synthetic fiber is a synthetic fiber selected from polyamide-based fibers; an eighth invention is the infrared-absorbing fibrous structure having a quick-drying property according to the seventh invention, wherein the polyamide-based fiber is nylon 6; a ninth invention is the infrared-absorbing fibrous structure having a quick-drying property according to the eighth invention, comprising a tricot knitted from an infrared-absorbing filament yarn obtained by melt-spinning a masterbatch composed of nylon 6 containing Cs 0.33 WO 3 fine particles, and a polyurethane elastic fiber; a tenth invention is the infrared-absorbing fibrous structure having a quick-drying property according to the fifth invention, wherein the semi-synthetic fiber is any semi-synthetic fiber selected from a cellulose-based fiber, a protein-based fiber, chlorinated rubber, and rubber hydrochloride; an eleventh invention is the infrared-absorbing fibrous structure having a quick-drying property according to the fifth invention, wherein the natural fiber is any natural fiber selected from a plant fiber, an animal fiber, and a mineral fiber; a twelfth invention is the infrared-absorbing fibrous structure having a quick-drying property according to the fifth invention, wherein the regenerated fiber is any regenerated fiber selected from a cellulose-based fiber, a protein-based fiber, an algin fiber, a rubber fiber, a chitin fiber, and a mannan fiber; and further, a thirteenth invention is a garment comprising the infrared-absorbing fibrous structure having a quick-drying property according to the first invention or the second invention. EFFECTS OF THE INVENTION

[0012] According to the infrared-absorbing fibrous structure and the garment according to the present invention, since the infrared-absorbing fibrous structure is constituted using the infrared-absorbing fiber comprising one or more infrared-absorbing material fine particles selected from tungsten oxide fine particles or composite tungsten oxide fine particles on the surface and / or in the interior of the fiber, the particle size of the infrared-absorbing material fine particles is 1 nm or more and 200 nm or less, and the content of the infrared-absorbing material fine particles per unit area of the infrared-absorbing fibrous structure is set to 0.05 g / m 2< or more and 8.0 g / m 2< or less, it becomes possible to realize a quick-drying property of the infrared-absorbing fibrous structure and the garment without depending on the single filament cross-sectional shape of the fiber.

[0013] Then, since the degree of freedom of the single filament cross-sectional shape in the fiber is high, it becomes possible to appropriately select a texture such as gloss of the infrared-absorbing fibrous structure, and as a result, there is an effect that an infrared-absorbing fibrous structure and a garment excellent in quick-drying property and also excellent in designability can be provided.BEST MODES FOR PRACTICING THE INVENTION

[0014] Hereinafter, embodiments of the present invention will be described in detail.

[0015] First, the infrared-absorbing fibrous structure according to the present invention is constituted by processing an infrared-absorbing fiber containing inorganic infrared-absorbing material fine particles (tungsten oxide fine particles or composite tungsten oxide fine particles) on a surface and / or in an interior thereof, and examples of the infrared-absorbing fibrous structure include a woven fabric, a knitted fabric, and a nonwoven fabric.(1) Infrared-Absorbing Material Fine Particles

[0016] The infrared-absorbing fiber (near-infrared-absorbing fiber) according to the present invention is obtained by causing infrared-absorbing material fine particles (fine particles having an infrared-absorbing function) to be contained on a fiber surface and / or in an interior of the fiber.

[0017] Hereinafter, tungsten oxide fine particles and composite tungsten oxide fine particles having an infrared-absorbing function will be described.

[0018] The tungsten oxide fine particle having an infrared-absorbing function is a fine particle represented by a general formula WO X (provided that W is tungsten, O is oxygen, and 2.45 ≤ X ≤ 2.999); and the composite tungsten oxide fine particle having an infrared-absorbing function is a fine particle represented by a general formula M Y WO Z (provided that the element M is one or more kinds of elements selected from H, He, alkali metals, alkaline earth metals, rare earth elements, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, and I, W is tungsten, O is oxygen, 0.001 ≤ Y ≤ 1.0, and 2.2 ≤ Z ≤ 3.0) and having a hexagonal crystal structure.

[0019] Then, when the tungsten oxide fine particles or the composite tungsten oxide fine particles are applied to various fibers, they function as an infrared-absorbing component.

[0020] Examples of the tungsten oxide fine particles represented by the general formula WO X (2.45 ≤ X ≤ 2.999) include W 18 O 49 , W 20 O 58 , W 4 O 11 , and the like. If the value of X is 2.45 or more, appearance of an undesired crystal phase of WO 2 in the infrared-absorbing material fine particles can be completely avoided, and chemical stability of the material can be obtained. Further, if the value of X is 2.999 or less, a sufficient amount of free electrons is generated, resulting in an efficient infrared-absorbing material fine particle.

[0021] Then, the WO X compound in which the range of X is 2.45 ≤ X ≤ 2.95 is included in a so-called Magneli phase compound.

[0022] Further, examples of the composite tungsten oxide fine particles represented by the general formula M Y WO Z and having a hexagonal crystal structure include composite tungsten oxide fine particles containing one or more kinds of elements selected from respective elements of Cs, Rb, K, Tl, In, Ba, Li, Ca, Sr, Fe, and Sn as preferred M elements.

[0023] An addition amount Y of the element M to be added needs to be 0.001 or more and 1.0 or less, and is preferably around 0.33. This is because the value of Y theoretically calculated from the hexagonal crystal structure is 0.33, and preferable optical characteristics can be obtained with an addition amount around this value. Typical examples include Cs 0.33 WO 3 , Rb 0.33 WO 3 , K 0.33 WO 3 , Ba 0.33 WO 3 , and the like, but useful infrared-absorbing characteristics can be obtained as long as Y and Z fall within the above ranges.(2) Particle Size of Infrared-Absorbing Material Fine Particles

[0024] Regarding the particle size of the infrared-absorbing material fine particles, it is important not to cause a problem during a fiberizing step such as spinning or drawing, and an average particle size of the infrared-absorbing material fine particles is preferably 200 nm or less. If the average particle size of the fine particles is 200 nm or less, it is possible to avoid a decrease in spinnability such as clogging of a spinneret (nozzle) or yarn breakage in a spinning step. Further, even if spinning can be performed, a problem such as yarn breakage may occur in a drawing step, and moreover, it may become difficult to uniformly mix and disperse the particles in a spinning raw material; therefore, from this viewpoint as well, the average particle size is preferably 200 nm or less.

[0025] On the other hand, considering designability such as dyeability of the infrared-absorbing fibrous structure containing the infrared-absorbing material fine particles on the fiber surface and / or in the interior of the fiber, it is necessary for the infrared-absorbing material fine particles to efficiently absorb near-infrared rays to perform infrared absorption while maintaining transparency. The infrared-absorbing material fine particles selected from tungsten oxide fine particles or composite tungsten oxide fine particles transmit light in the visible region (wavelength 380 nm to 780 nm) and largely absorb light in a near-infrared region, particularly in a wavelength range of about 780 to 2200 nm, and therefore, transmitted color tones thereof are often blue-based to green-based. For this reason, transparency can be secured if the particle size (particle diameter) of the infrared-absorbing material fine particles is made smaller than 200 nm, but when transparency is considered more important, the particle diameter is set to 100 nm or less. On the other hand, if the particle diameter is 1 nm or more, industrial production is easy, and therefore, the particle size (particle diameter) of the infrared-absorbing material fine particles needs to be 1 nm or more and 200 nm or less. By securing such transparency in visible light, the infrared-absorbing fibrous structure can be freely dyed. In particular, unlike ceramic particles having a photothermal conversion function including nitrides and carbides of titanium, zirconium, and the like, which have conventionally been known to be added to photothermal conversion fibers, the tungsten oxide fine particles and composite tungsten oxide fine particles of the infrared-absorbing material fine particles used in the present invention can ensure transparency in the visible light region, so that the degree of freedom in dyeing is high and color developability after dyeing is excellent.

[0026] Incidentally, infrared rays absorbed by the infrared-absorbing material fine particles are converted into heat. Since the infrared-absorbing fibrous structure irradiated with infrared rays or sunlight generates heat as the infrared-absorbing material fine particles absorb infrared rays, it becomes possible to volatilize moisture such as sweat absorbed by the infrared-absorbing fibrous structure without depending on the single filament cross-sectional shape of the fiber.(3) Content of Infrared-Absorbing Material Fine Particles Contained on Fiber Surface and / or in Interior of Fiber

[0027] Since the infrared-absorbing capability per unit weight of the tungsten oxide fine particles and the composite tungsten oxide fine particles is very high, they exhibit the effect with a usage amount of about 1 / 4 to 1 / 10 of that required for ITO or ATO. In the composite tungsten oxide fine particles, when they have a hexagonal crystal structure and K, Rb, or Cs is used as the element M, the infrared-absorbing capability at a wavelength of 780 nm or more is particularly excellent; therefore, since the infrared-absorbing fibrous structure using the infrared-absorbing fiber containing these composite tungsten oxide fine particles volatilizes moisture absorbed by the infrared-absorbing fibrous structure more effectively by heat generation due to infrared absorption, a quick-drying property as a garment can be realized.

[0028] Then, regarding the content of the infrared-absorbing material fine particles (tungsten oxide fine particles or composite tungsten oxide fine particles) contained in the infrared-absorbing fiber, it is preferably set between 0.001% by weight and 80% by weight, and considering the weight of the fiber and raw material cost after addition of the infrared-absorbing material fine particles, the content is more preferably set between 0.005% by weight and 50% by weight. If the content of the infrared-absorbing material fine particles is 0.001% by weight or more, a sufficient infrared-absorbing effect can be obtained even if the fabric (infrared-absorbing fibrous structure) is thin, if it is 80% by weight or less, a decrease in spinnability due to clogging of a spinneret (nozzle) or yarn breakage in the spinning step can be avoided, and if it is 50% by weight or less, the addition amount of the infrared-absorbing material fine particles can be small, so that physical properties of the fiber are not impaired.(4) Content of Infrared-Absorbing Material Fine Particles per Unit Area of Infrared-Absorbing Fibrous Structure

[0029] The content of the infrared-absorbing material fine particles per unit area of the infrared-absorbing fibrous structure is 0.05 g / m 2< or more and 8.0 g / m 2< or less, preferably 0.1 g / m 2< or more and 5.0 g / m 2< or less, and more preferably 0.3 g / m 2< or more and 4.5 g / m 2< or less. If the content of the infrared-absorbing material fine particles per unit area of the infrared-absorbing fibrous structure is 0.05 g / m 2< or more, the infrared-absorbing material fine particles having absorbed infrared rays generate heat, promoting drying of moisture contained in the infrared-absorbing fibrous structure.

[0030] On the other hand, when the content of the infrared-absorbing material fine particles per unit area of the infrared-absorbing fibrous structure exceeds 8.0 g / m 2< , the effect of the quick-drying property does not improve to an extent proportional to the excess amount; therefore, the content of the infrared-absorbing material fine particles per unit area of the infrared-absorbing fibrous structure is desirably 0.3 g / m 2< or more and 4.5 g / m 2< or less. If the content of the infrared-absorbing material fine particles per unit area is 0.3 g / m 2< or more and 4.5 g / m 2< or less, a quick-drying property by solar radiation can be secured. Incidentally, when the infrared-absorbing material fine particles per unit area of the infrared-absorbing fibrous structure are excessively contained, depending on the color for dyeing the infrared-absorbing fibrous structure, color development thereof may be rendered difficult.(5) Far-Infrared Radiating Substance Fine Particles

[0031] In addition to the infrared-absorbing material fine particles, far-infrared radiating substance fine particles having an ability to radiate far-infrared rays may be further contained on the surface and / or in the interior of the infrared-absorbing fiber, and examples of the far-infrared radiating substance fine particles include metal oxides such as ZrO 2 , SiO 2 , TiO 2 , Al 2 O 3 , MnO 2 , MgO, Fe 2 O 3 , and CuO, carbides such as ZrC, SiC, and TiC, and nitrides such as ZrN, Si 3 N 4 , and AlN.

[0032] The far-infrared radiating substance fine particles have an ability to receive energy absorbed by the infrared-absorbing material fine particles and convert the energy into heat energy in the mid- / far-infrared wavelength range, and radiate the heat energy. For this reason, since the infrared-absorbing material fine particles and the far-infrared radiating substance fine particles coexist on the surface and / or in the interior of the infrared-absorbing fiber, solar energy absorbed by the infrared-absorbing material fine particles is efficiently consumed on the surface and / or in the interior of the infrared-absorbing fiber, and therefore, further improvement of the quick-drying property can be achieved.

[0033] Incidentally, the content of the far-infrared radiating substance fine particles per unit area of the infrared-absorbing fibrous structure is exemplified as 0.10 g / m 2< or more and 5.0 g / m 2< or less.(6) Infrared-Absorbing Fiber

[0034] The fiber used for the infrared-absorbing fiber according to the present invention can be variously selected depending on the use, and any of a synthetic fiber, a semi-synthetic fiber, a natural fiber, a regenerated fiber, an inorganic fiber, or a mixed yarn of these fibers obtained by blending, plying, commingling, or the like may be used. Furthermore, considering containing inorganic fine particles in the fiber by a simple method and heat retention durability, a synthetic fiber is preferable.(6-1) Synthetic Fiber

[0035] The synthetic fiber used for the infrared-absorbing fiber according to the present invention is not particularly limited, and examples thereof include a polyurethane fiber, a polyamide-based fiber, an acrylic-based fiber, a polyester-based fiber, a polyolefin-based fiber, a polyvinyl alcohol-based fiber, a polyvinylidene chloride-based fiber, a polyvinyl chloride-based fiber, a polyether ester-based fiber, and the like.

[0036] For example, examples of the polyamide-based fiber include nylon, nylon 6, nylon 66, nylon 11, nylon 610, nylon 612, aromatic nylon, aramid, and the like.

[0037] Also, for example, examples of the acrylic-based fiber include polyacrylonitrile, acrylonitrile-vinyl chloride copolymer, modacrylic, and the like.

[0038] Also, for example, examples of the polyester-based fiber include polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, and the like.

[0039] Also, for example, examples of the polyolefin-based fiber include polyethylene, polypropylene, polystyrene, and the like.

[0040] Also, for example, examples of the polyvinyl alcohol-based fiber include vinylon and the like.

[0041] Also, for example, examples of the polyvinylidene chloride-based fiber include vinylidene and the like.

[0042] Also, for example, examples of the polyvinyl chloride-based fiber include polyvinyl chloride and the like.

[0043] Also, for example, examples of the polyether ester-based fiber include REXE, SUCCESS, and the like.(6-2) Semi-Synthetic Fiber

[0044] When the fiber used for the infrared-absorbing fiber according to the present invention is a semi-synthetic fiber, examples thereof include a cellulose-based fiber, a protein-based fiber, chlorinated rubber, rubber hydrochloride, and the like.

[0045] Also, for example, examples of the cellulose-based fiber include acetate, triacetate, oxidized acetate, and the like.

[0046] Also, for example, examples of the protein fiber include PROMIX and the like.(6-3) Natural Fiber

[0047] When the fiber used for the infrared-absorbing fiber according to the present invention is a natural fiber, examples thereof include a plant fiber, an animal fiber, a mineral fiber, and the like.

[0048] Also, for example, examples of the plant fiber include cotton, kapok, flax, hemp, jute, Manila hemp, sisal hemp, New Zealand flax, Apocynum venetum, palm fibers, rush, wheat straw, and the like.

[0049] Also, for example, examples of the animal fiber include wool such as sheep wool, goat hair, mohair, cashmere, alpaca, angora, camel, and vicuna, silk, down, feather, and the like.

[0050] Also, for example, examples of the mineral fiber include asbestos and the like.(6-4) Regenerated Fiber

[0051] When the fiber used for the infrared-absorbing fiber according to the present invention is a regenerated fiber, examples thereof include a cellulose-based fiber, a protein-based fiber, an algin fiber, a rubber fiber, a chitin fiber, a mannan fiber, and the like.

[0052] Also, for example, examples of the cellulose-based fiber include rayon, viscose rayon, cupra, polynosic, cuprammonium rayon, and the like.

[0053] Also, for example, examples of the protein-based fiber include casein fiber, peanut protein fiber, corn protein fiber, soybean protein fiber, regenerated silk thread, and the like.(6-5) Inorganic Fiber

[0054] When the fiber used for the infrared-absorbing fiber according to the present invention is an inorganic fiber, examples thereof include a metal fiber, a carbon fiber, a silicate fiber, and the like.

[0055] Also, for example, examples of the metal fiber include a metal fiber, a gold thread, a silver thread, a heat-resistant alloy fiber, and the like.

[0056] Also, for example, examples of the silicate fiber include a glass fiber, a slag fiber, a rock fiber, and the like.(7) Cross-Sectional Shape and the Like of Infrared-Absorbing Fiber

[0057] The cross-sectional shape of the infrared-absorbing fiber according to the present invention is not particularly limited, and examples thereof include a circle, a triangle, a hollow shape, a flat shape, a Y-shape, a star shape, a core-sheath type, and the like. Containing of the fine particles on the surface and / or in the interior of the fiber is possible in various forms; for example, in the case of a core-sheath type, the fine particles may be contained in a core portion or may be contained in a sheath portion of the fiber. Further, the shape of the infrared-absorbing fiber may be a filament (long fiber) or a staple (short fiber).

[0058] Further, the infrared-absorbing fiber according to the present invention can be used by containing an antioxidant, a flame retardant, a deodorant, an insect repellent, an antibacterial agent, an ultraviolet absorber, or the like depending on the purpose within a range not impairing the performance of the fiber.(8) Method for Containing Infrared-Absorbing Material Fine Particles on Fiber Surface and / or in Interior of Fiber

[0059] A method according to the present invention for containing the infrared-absorbing material fine particles on the fiber surface and / or in the interior of the fiber is not particularly limited. Examples thereof include (A) a method of directly mixing the infrared-absorbing material fine particles into a raw material polymer of a synthetic fiber and spinning the mixture, (B) a method of producing a masterbatch in which the infrared-absorbing material fine particles are contained in a part of a raw material polymer at a high concentration in advance, and diluting and adjusting this to a predetermined concentration at the time of spinning, and then spinning the mixture, (C) a method of dispersing the infrared-absorbing material fine particles uniformly in a raw material monomer or oligomer solution in advance, synthesizing a target raw material polymer using this dispersion solution and simultaneously dispersing the infrared-absorbing material fine particles uniformly in the raw material polymer, and then spinning the mixture, and (D) a method of attaching the infrared-absorbing material fine particles to a surface of a fiber obtained by spinning in advance using a binder or the like.

[0060] Here, a preferable example of the method described in (B) above, in which a masterbatch is produced and this is diluted and adjusted at the time of spinning and then spun, will be described in detail below.

[0061] The method for producing the masterbatch is not particularly limited, but for example, a masterbatch can be prepared as a mixture in which fine particles are uniformly dispersed in a thermoplastic resin by uniformly melting and mixing a dispersion liquid of tungsten oxide fine particles and / or composite tungsten oxide fine particles, powder, granules, or pellets of the thermoplastic resin, and other additives as necessary while removing a solvent using a mixer such as a ribbon blender, a tumbler, NAUTA MIXER, HENSCHEL-Mixer, SUPERMIXER, or a planetary mixer, and a kneading machine such as a Banbury mixer, a kneader, a roll, KNEADER-RUDER, a single screw extruder, or a twin screw extruder.

[0062] Furthermore, it is also possible to produce a mixture in which the fine particles are uniformly dispersed in a thermoplastic resin by preparing the dispersion liquid of tungsten oxide fine particles and / or composite tungsten oxide fine particles, then removing the solvent of the dispersion liquid by a known method, and uniformly melting and mixing the obtained powder of tungsten oxide fine particles and / or composite tungsten oxide fine particles, powder, granules, or pellets of the thermoplastic resin, and other additives as necessary. Besides this, a method of directly adding a powder of the tungsten oxide fine particles and / or composite tungsten oxide fine particles to the thermoplastic resin and uniformly melting and mixing the mixture can also be used.

[0063] An infrared-absorbing material fine particle-containing masterbatch can be obtained by kneading the mixture of the tungsten oxide fine particles and / or composite tungsten oxide fine particles obtained by the above-described method and the thermoplastic resin with a vented single screw or twin screw extruder and processing the kneaded product into pellets.

[0064] Here, the methods (A) to (D) described above will be specifically described below.

[0065] Method of (A): For example, when a polyester fiber is used as the fiber, the dispersion liquid of tungsten oxide fine particles and / or composite tungsten oxide fine particles is added to polyethylene terephthalate resin pellets which are a thermoplastic resin, uniformly mixed with a blender, and then the solvent is removed. The mixture from which the solvent has been removed is melt-kneaded with a twin screw extruder to obtain a tungsten oxide fine particle and / or composite tungsten oxide fine particle-containing masterbatch. The obtained tungsten oxide fine particle and / or composite tungsten oxide fine particle-containing masterbatch is melted and mixed near the melting temperature of the resin and spun according to a conventional method.

[0066] Method of (B): In the same manner as in (A) except for using a previously prepared tungsten oxide fine particle and / or composite tungsten oxide fine particle-containing masterbatch, the tungsten oxide fine particle and / or composite tungsten oxide fine particle-containing masterbatch and a target amount of a masterbatch composed of polyethylene terephthalate to which no fine particles are added are melted and mixed near the melting temperature of the resin and spun according to a conventional method.

[0067] Method of (C): For example, when a urethane fiber is used as the fiber, a polymer diol containing tungsten oxide fine particles and / or composite tungsten oxide fine particles and an organic diisocyanate are reacted in a twin screw extruder to synthesize an isocyanate group-terminated prepolymer, and then a chain extender is reacted therewith to produce a polyurethane solution (raw material polymer). The polyurethane solution is spun according to a conventional method.

[0068] Method of (D): For example, in order to attach the infrared-absorbing material fine particles to the surface of a natural fiber, first, a treatment liquid obtained by mixing the tungsten oxide fine particles and / or composite tungsten oxide fine particles, at least one binder resin selected from acrylic, epoxy, urethane, and polyester, and a solvent such as water is prepared. Next, by immersing the natural fiber in the prepared treatment liquid or impregnating the natural fiber with the prepared treatment liquid by padding, printing, spraying, or the like, and drying the fiber, the tungsten oxide fine particles and / or composite tungsten oxide fine particles can be attached to the natural fiber. Then, the method of (D) can be applied to any of a semi-synthetic fiber, a regenerated fiber, an inorganic fiber, or a mixed yarn of these fibers obtained by blending, plying, commingling, or the like in addition to the above-mentioned natural fiber.

[0069] Incidentally, when performing the methods according to the above (A) to (D), a dispersion method of the tungsten oxide fine particles and / or composite tungsten oxide fine particles may be any method as long as the fine particles can be uniformly dispersed in a liquid, and for example, methods such as a media stirring mill, a ball mill, a sand mill, and ultrasonic dispersion can be suitably applied.

[0070] Further, a dispersion medium of the infrared-absorbing material fine particles is not particularly limited and can be selected in accordance with the fiber to be mixed, and for example, various general organic solvents such as alcohols, ethers, esters, ketones, and aromatic compounds, and water can be used.

[0071] Furthermore, when attaching and mixing the infrared-absorbing material fine particles to the fiber or the polymer serving as the raw material thereof, the dispersion liquid of the infrared-absorbing material fine particles may be directly mixed with the fiber or the polymer serving as the raw material thereof. Further, if necessary, the pH may be adjusted by adding an acid or an alkali to the dispersion liquid of the infrared-absorbing material fine particles, and in order to further improve dispersion stability of the fine particles, it is also preferable to add various surfactants, coupling agents, and the like.

[0072] Further, in order to improve weather resistance of the infrared-absorbing material fine particles, it is also preferable to coat surfaces of the tungsten oxide fine particles and / or composite tungsten oxide fine particles with a compound containing one or more kinds of elements selected from silicon, zirconium, titanium, and aluminum. Since these compounds are basically transparent and do not lower the visible light transmittance of the infrared-absorbing material fine particles by addition, the designability of the fiber is not impaired.

[0073] Furthermore, in order to improve chemical resistance characteristics of the infrared-absorbing material fine particles, the surfaces of the tungsten oxide fine particles and / or composite tungsten oxide fine particles may be coated with a thermoplastic resin such as a polyester resin, a polycarbonate resin, an acrylic resin, a polystyrene resin, a polyamide resin, a vinyl chloride resin, an olefin resin, a fluororesin, a polyvinyl acetate resin, a thermoplastic polyurethane resin, an acrylonitrile butadiene styrene resin, a polyvinyl acetal resin, an acrylonitrile-styrene copolymer resin, or an ethylenevinyl acetate copolymer resin, or a thermosetting resin such as a phenol resin, an epoxy resin, a melamine resin, a urea resin, an unsaturated polyester resin, an alkyd resin, a thermosetting polyurethane resin, a polyimide resin, or a silicone resin.

[0074] As described above, the infrared-absorbing fiber according to the present invention enables absorption of infrared rays by causing a small amount of tungsten oxide fine particles and / or composite tungsten oxide fine particles as an infrared-absorbing component to be contained on the fiber surface and / or in the interior of the fiber.

[0075] The infrared-absorbing fiber is processed into a long fiber or a short fiber depending on the use, and then spun and processed into a woven fabric or a knitted fabric by a known method to become an infrared-absorbing fibrous structure. Further, the infrared-absorbing fiber is processed by a known method to become a nonwoven fabric to become an infrared-absorbing fibrous structure. Of course, a yarn obtained by spinning the infrared-absorbing fiber (spun yarn) may be colorless or dyed. Further, the infrared-absorbing fibrous structure such as a woven fabric, a knitted fabric, or a nonwoven fabric may also be partially or wholly dyed.

[0076] The infrared-absorbing fibrous structure according to the present invention has good weather resistance and is colorless, and since the addition amount of the infrared-absorbing material fine particles is small, the degree of freedom of coloring such as dyeing is high with respect to the fibrous structure or the obtained garment, so that impairing designability is avoided, and impairing basic physical properties in the fiber such as strength and elongation can also be avoided. As a result, since the infrared-absorbing fibrous structure according to the present invention has a quick-drying property, it can be used for garments such as sports underwear and swimwear.(9) Method for producing infrared-absorbing material fine particles

[0077] Next, a method for producing infrared-absorbing material fine particles according to the present invention will be described taking a method for producing tungsten oxide fine particles represented by a general formula WO X and composite tungsten oxide fine particles represented by a general formula M Y WO Z as examples.

[0078] The tungsten oxide fine particles and / or composite tungsten oxide fine particles can be obtained by weighing and mixing a predetermined amount of a tungsten compound which is a starting material of the oxide fine particles, and then heat-treating the mixture in an inert gas atmosphere or a reducing gas atmosphere.

[0079] The tungsten compound which is the starting material is preferably any one or more kinds selected from tungsten trioxide powder, tungsten dioxide powder, or a hydrate of tungsten oxide, or tungsten hexachloride powder, or ammonium tungstate powder, or a hydrate powder of tungsten oxide obtained by dissolving tungsten hexachloride in alcohol and then drying, or a hydrate powder of tungsten oxide obtained by dissolving tungsten hexachloride in alcohol and then adding water to cause precipitation and drying this, or a tungsten compound powder obtained by drying an aqueous ammonium tungstate solution, and metal tungsten powder.

[0080] Here, when producing the tungsten oxide fine particles, from the viewpoint of ease of the production process, it is more preferable to use a hydrate powder of tungsten oxide, tungsten trioxide, or a tungsten compound powder obtained by drying an aqueous ammonium tungstate solution; and when producing the composite tungsten oxide fine particles, from the viewpoint that respective elements can be easily mixed uniformly if the starting material is a solution, it is more preferable to use an aqueous ammonium tungstate solution or a tungsten hexachloride solution. Using these raw materials, by heat-treating this in an inert gas atmosphere or a reducing gas atmosphere, the above-mentioned tungsten oxide fine particles and / or composite tungsten oxide fine particles having an infrared-absorbing function can be obtained.

[0081] Further, the starting material of the composite tungsten oxide fine particles having an infrared-absorbing function is a tungsten compound similar to the starting material for the above-described tungsten oxide fine particles having an infrared-absorbing function, but a tungsten compound further containing an element M in elemental form or as a compound is used as the starting material. Here, in order to produce a tungsten compound which is a starting material in which respective components are uniformly mixed at a molecular level, it is preferable to mix respective raw materials in solutions, and it is preferable that the tungsten compound containing the element M is soluble in a solvent such as water or an organic solvent. Examples thereof include tungstates, chloride salts, nitrates, sulfates, oxalates, oxides, carbonates, hydroxides, and the like containing the element M, but are not limited thereto, and those which become a solution state are preferable.

[0082] Regarding the raw materials for producing the tungsten oxide fine particles and the composite tungsten oxide fine particles described above, detailed description will be given again below.

[0083] As the tungsten compound which is the starting material for obtaining the tungsten oxide fine particles represented by the general formula WO X , any one or more kinds selected from tungsten trioxide powder, tungsten dioxide powder, or a hydrate of tungsten oxide, or tungsten hexachloride powder, or ammonium tungstate powder, or a hydrate powder of tungsten oxide obtained by dissolving tungsten hexachloride in alcohol and then drying, or a hydrate powder of tungsten oxide obtained by dissolving tungsten hexachloride in alcohol and then adding water to cause precipitation and drying this, or a tungsten compound powder obtained by drying an aqueous ammonium tungstate solution, and metal tungsten powder can be used; however, from the viewpoint of ease of the production process, it is more preferable to use a hydrate powder of tungsten oxide, tungsten trioxide powder, or a tungsten compound powder obtained by drying an aqueous ammonium tungstate solution.

[0084] As the starting material for obtaining the composite tungsten oxide fine particles represented by the general formula M Y WO Z containing the element M, a powder obtained by mixing any one or more kinds of powders selected from tungsten trioxide powder, tungsten dioxide powder, or a hydrate of tungsten oxide, or tungsten hexachloride powder, or ammonium tungstate powder, or a hydrate powder of tungsten oxide obtained by dissolving tungsten hexachloride in alcohol and then drying, or a hydrate powder of tungsten oxide obtained by dissolving tungsten hexachloride in alcohol and then adding water to cause precipitation and drying this, or a tungsten compound powder obtained by drying an aqueous ammonium tungstate solution, and metal tungsten powder, with a powder of a simple substance or a compound containing the element M can be used.

[0085] Furthermore, if the tungsten compound which is the starting material for obtaining the composite tungsten oxide fine particles is a solution or a dispersion liquid, respective elements can be easily mixed uniformly.

[0086] From this viewpoint, it is more preferable that the starting material of the fine particles of the composite tungsten oxide is a powder obtained by mixing an alcohol solution of tungsten hexachloride or an aqueous ammonium tungstate solution and a solution of a compound containing the element M, and then drying.

[0087] Similarly, it is also preferable that the starting material of the fine particles of the composite tungsten oxide is a powder obtained by mixing a dispersion liquid in which a precipitate is generated by dissolving tungsten hexachloride in alcohol and then adding water, and a powder of a simple substance or a compound containing the element M or a solution of a compound containing the element M, and then drying.

[0088] Examples of the compound containing the element M include tungstates, chloride salts, nitrates, sulfates, oxalates, oxides, carbonates, hydroxides, and the like of the element M, but are not limited thereto, and any compound may be used as long as it becomes a solution state. Furthermore, when industrially producing the composite tungsten oxide fine particles, use of a hydrate powder of tungsten oxide or tungsten trioxide and a carbonate or hydroxide of the element M is a preferable production method because no harmful gas or the like is generated in a stage such as heat treatment.

[0089] Here, as heat treatment conditions in an inert atmosphere for the tungsten oxide fine particles and the composite tungsten oxide fine particles, 650°C or higher is preferable. A starting material heat-treated at 650°C or higher has a sufficient infrared-absorbing function and is efficient as fine particles having an infrared-absorbing function. As the inert gas, it is preferable to use an inert gas such as Ar or N 2 . Further, as heat treatment conditions in a reducing atmosphere, first, it is preferable to heat-treat the starting material in a reducing gas atmosphere at 100°C or higher and 850°C or lower, and then heat-treat it in an inert gas atmosphere at a temperature of 650°C or higher and 1200°C or lower. The reducing gas at this time is not particularly limited, but H 2 is preferable. Further, when using H 2 as the reducing gas, as a composition of the reducing atmosphere, H 2 is preferably 0.1% or more by volume ratio, and more preferably 2% or more. If H 2 is 0.1% or more by volume ratio, reduction can be efficiently promoted.Examples

[0090] Hereinafter, Examples of the present invention will be specifically described giving Comparative Examples as well.[Example 1]

[0091] 10 parts by weight of Cs 0.33 WO 3 fine particles, 80 parts by weight of toluene, and 10 parts by weight of a dispersant for fine particle dispersion were mixed, and a dispersion treatment of the mixture (Cs 0.33 WO 3 fine particles, toluene, and dispersant for fine particle dispersion) was performed with a media stirring mill to prepare a dispersion liquid A of Cs 0.33 WO 3 fine particles.

[0092] Next, toluene was removed from the dispersion liquid A of Cs 0.33 WO 3 fine particles using a spray dryer to obtain a dispersion powder A of Cs 0.33 WO 3 fine particles having a particle diameter of 32 nm.

[0093] Incidentally, the particle diameter can be determined by measuring particle diameters of 100 particles of the Cs 0.33 WO 3 fine particles (composite tungsten oxide fine particles) from a transmission electron microscope image of the Cs 0.33 WO 3 fine particles (composite tungsten oxide fine particles) using an image processing apparatus and calculating an average value thereof.

[0094] After pre-mixing 20% by weight of the obtained dispersion powder A of Cs 0.33 WO 3 fine particles and nylon 6 pellets as the balance with a tumbler mixer, the mixture was melt-kneaded and extruded in a twinscrew vented extruder with a set temperature of 280°C, and the extruded strands were cut into pellets to obtain a masterbatch A.

[0095] Next, the masterbatch A containing Cs 0.33 WO 3 fine particles was melt-spun, and using a spinneret with round holes for producing a normal cross-section yarn, an infrared-absorbing filament yarn (50 denier / 16 filaments), that is, an infrared-absorbing filament yarn having a thickness of 50 denier and the number of bundled fibers (filaments) of 16 was produced.

[0096] Using the obtained infrared-absorbing filament yarn and a spandex fiber (40 denier / 1 filament) of polyurethane elastic fiber, a tricot A according to Example 1 was knitted.

[0097] Incidentally, the obtained tricot was adjusted so as to contain 0.17 g / m 2< of Cs 0.33 WO 3 fine particles (composite tungsten oxide fine particles) per unit area.

[0098] Next, the obtained tricot A according to Example 1 was cut into a 30 cm square and sampled as Sample A1.

[0099] Then, after immersing the sampled Sample A1 in distilled water, the moisture content was adjusted to 100% with filter paper to obtain Sample A2 according to Example 1, and the Sample A2 was irradiated with an incandescent light bulb (Eye Lamp for Photography E26 PRS500W manufactured by IWASAKI ELECTRIC CO., LTD.) at a distance of 80 cm in an artificial weather room at a constant temperature of 20°C and a constant humidity of 65% relative humidity, and a change in fabric weight (moisture content) was measured.

[0100] The results are shown in Table 1 below.

[0101] Incidentally, the moisture content was determined by the following formula.

[0102] A faster decrease rate of the moisture content indicates that the quick-drying property is superior.[Example 2]

[0103] A tricot B according to Example 2 was produced in the same manner as in Example 1 except that the dispersion treatment time by the media stirring mill of the mixture (Cs 0.33 WO 3 fine particles, toluene, and dispersant for fine particle dispersion) was adjusted to obtain a Cs 0.33 WO 3 dispersion powder B having a particle diameter of 13 nm.

[0104] Then, a Sample B1 was sampled from the produced tricot B, and the sampled Sample B1 was immersed in distilled water to prepare a Sample B2 according to Example 2, and then a change in fabric weight (moisture content) in the Sample B2 according to Example 2 was measured in the same manner as in Example 1.

[0105] This result is also shown in Table 1.[Example 3]

[0106] A tricot C according to Example 3 was produced in the same manner as in Example 1 except that the dispersion treatment time by the media stirring mill of the mixture (Cs 0.33 WO 3 fine particles, toluene, and dispersant for fine particle dispersion) was adjusted to obtain a Cs 0.33 WO 3 dispersion powder C having a particle diameter of 78 nm.

[0107] Then, a Sample C1 was sampled from the produced tricot C, and the sampled Sample C1 was immersed in distilled water to prepare a Sample C2 according to Example 3, and then a change in fabric weight (moisture content) in the Sample C2 according to Example 3 was measured in the same manner as in Example 1.

[0108] This result is also shown in Table 1.[Example 4]

[0109] A tricot D according to Example 4 was produced in the same manner as in Example 1 except that the dispersion treatment time by the media stirring mill of the mixture (Cs 0.33 WO 3 fine particles, toluene, and dispersant for fine particle dispersion) was adjusted to obtain a Cs 0.33 WO 3 dispersion powder D having a particle diameter of 126 nm.

[0110] Then, a Sample D1 was sampled from the produced tricot D, and the sampled Sample D1 was immersed in distilled water to prepare a Sample D2 according to Example 4, and then a change in fabric weight (moisture content) in the Sample D2 according to Example 4 was measured in the same manner as in Example 1.

[0111] This result is also shown in Table 1.[Example 5]

[0112] A tricot E according to Example 5 was produced in the same manner as in Example 1 except that the dispersion treatment time by the media stirring mill of the mixture (Cs 0.33 WO 3 fine particles, toluene, and dispersant for fine particle dispersion) was adjusted to obtain a Cs 0.33 WO 3 dispersion powder E having a particle diameter of 185 nm.

[0113] Then, a Sample E1 was sampled from the produced tricot E, and the sampled Sample E1 was immersed in distilled water to prepare a Sample E2 according to Example 5, and then a change in fabric weight (moisture content) in the Sample E2 according to Example 5 was measured in the same manner as in Example 1.

[0114] This result is also shown in Table 1.[Comparative Example 1]

[0115] Nylon 6 pellets containing no Cs 0.33 WO 3 fine particles were melt-spun, and a nylon filament yarn (50 denier / 16 filaments) was obtained using a spinneret with round holes for producing a normal cross-section yarn.

[0116] Using the obtained nylon filament yarn (50 denier / 16 filaments) and a spandex fiber (40 denier / 1 filament), a tricot F according to Comparative Example 1 was knitted.

[0117] Then, a Sample F1 was sampled from the produced tricot F, and the sampled Sample F1 was immersed in distilled water to prepare a Sample F2 according to Comparative Example 1, and then a change in fabric weight (moisture content) in the Sample F2 according to Comparative Example 1 was measured in the same manner as in Example 1.

[0118] This result is also shown in Table 1. [Table 1]Sample NameParticle SizeQuick-Drying Property (Moisture Content %)Cs 0.33 WO 3 0 min30 min60 min90 minExample 1A232 nm1001700Example 2B213 nm1001900Example 3C278 nm1002000Example 4D2126 nm1001800Example 5E2185 nm1002100Comparative Example 1F2-10062201 [Confirmation](1) Tricots A to E according to Examples 1 to 5

[0119] It is confirmed that in the tricots A to E according to Examples 1 to 5 using the infrared-absorbing filament yarn, moisture is removed and they are dried in 60 minutes as shown in Table 1.(2) Tricot F according to Comparative Example 1

[0120] On the other hand, it is confirmed that in the tricot F according to Comparative Example 1 using the nylon filament yarn containing no Cs 0.33 WO 3 fine particles, moisture remains even after 60 minutes. (3) From these results, it is confirmed that the tricots A to E according to Examples 1 to 5 using the infrared-absorbing filament yarn have a quick-drying property as compared with Comparative Example 1.POSSIBILITY OF INDUSTRIAL APPLICATION

[0121] Since the infrared-absorbing fibrous structure according to the present invention is excellent in quick-drying property, it has industrial applicability for use in sports underwear, swimwear, and the like.

Claims

1. An infrared-absorbing fibrous structure having a quick-drying property formed by processing an infrared-absorbing fiber comprising one or more infrared-absorbing material fine particles selected from tungsten oxide fine particles or composite tungsten oxide fine particles on a surface and / or in an interior thereof, wherein a particle size of the infrared-absorbing material fine particles is 1 nm or more and 200 nm or less, and a content of the infrared-absorbing material fine particles per unit area of the infrared-absorbing fibrous structure is 0.05 g / m2 or more and 8.0 g / m2 or less.

2. The infrared-absorbing fibrous structure having a quick-drying property according to claim 1, wherein the tungsten oxide fine particle, when selected, is a tungsten oxide fine particle represented by a general formula WOX (provided that W is tungsten, O is oxygen, and 2.45 ≤ X ≤ 2.999), and the composite tungsten oxide fine particle, when selected, is a composite tungsten oxide fine particle represented by a general formula MYWOZ (provided that the element M is one or more kinds of elements selected from H, He, alkali metals, alkaline earth metals, rare earth elements, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, and I, W is tungsten, O is oxygen, 0.001 ≤ Y ≤ 1.0, and 2.2 ≤ Z ≤ 3.0) and having a hexagonal crystal structure.

3. The infrared-absorbing fibrous structure having a quick-drying property according to claim 2, wherein the element M of the composite tungsten oxide fine particle is one or more kinds of elements selected from Cs, Rb, K, Tl, In, Ba, Li, Ca, Sr, Fe, and Sn.

4. The infrared-absorbing fibrous structure having a quick-drying property according to claim 1 or 2, further comprising far-infrared radiating substance fine particles on the surface and / or in the interior of the infrared-absorbing fiber, wherein a content of the far-infrared radiating substance fine particles per unit area of the infrared-absorbing fibrous structure is 0.10 g / m2 or more.

5. The infrared-absorbing fibrous structure having a quick-drying property according to claim 1 or 2, wherein the infrared-absorbing fiber is a fiber selected from any of a synthetic fiber, a semi-synthetic fiber, a natural fiber, a regenerated fiber, an inorganic fiber, or a mixed yarn of these fibers obtained by blending, plying, or commingling.

6. The infrared-absorbing fibrous structure having a quick-drying property according to claim 5, wherein the synthetic fiber is any synthetic fiber selected from a polyurethane fiber, a polyamide-based fiber, an acrylic-based fiber, a polyester-based fiber, a polyolefin-based fiber, a polyvinyl alcohol-based fiber, a polyvinylidene chloride-based fiber, a polyvinyl chloride-based fiber, and a polyether ester-based fiber.

7. The infrared-absorbing fibrous structure having a quick-drying property according to claim 6, wherein the synthetic fiber is a synthetic fiber selected from polyamide-based fibers.

8. The infrared-absorbing fibrous structure having a quick-drying property according to claim 7, wherein the polyamide-based fiber is nylon 6.

9. The infrared-absorbing fibrous structure having a quick-drying property according to claim 8, comprising a tricot knitted from an infrared-absorbing filament yarn obtained by melt-spinning a masterbatch composed of nylon 6 containing Cs0.33WO3 fine particles, and a polyurethane elastic fiber.

10. The infrared-absorbing fibrous structure having a quick-drying property according to claim 5, wherein the semi-synthetic fiber is any semi-synthetic fiber selected from a cellulose-based fiber, a protein-based fiber, chlorinated rubber, and rubber hydrochloride.

11. The infrared-absorbing fibrous structure having a quick-drying property according to claim 5, wherein the natural fiber is any natural fiber selected from a plant fiber, an animal fiber, and a mineral fiber.

12. The infrared-absorbing fibrous structure having a quick-drying property according to claim 5, wherein the regenerated fiber is any regenerated fiber selected from a cellulose-based fiber, a protein-based fiber, an algin fiber, a rubber fiber, a chitin fiber, and a mannan fiber.

13. A garment comprising the infrared-absorbing fibrous structure having a quick-drying property according to claim 1 or 2.

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