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

Abstract

The problem to be solved by the present invention is to provide: an infrared-absorbing fiber structure capable of achieving quick-drying properties without relying on the single yarn cross-sectional shape of fibers constituting a fiber structure; and garment using the infrared-absorbing fiber structure.　The present invention is an infrared-absorbing fiber structure produced by processing infrared-absorbing fibers containing, on the surface and / or inside thereof, infrared-absorbing material microparticles selected from microparticles of a tungsten oxide represented by general formula: WOX (wherein W represents tungsten, O represents oxygen, and 2.45 ≤ X ≤ 2.999) and microparticles of a composite tungsten oxide represented by general formula: MYWOZ (wherein the element M is an element selected from Cs, Rb, K, Tl, In and the like, and 0.001 ≤ Y ≤ 1.0 and 2.2 ≤ Z ≤ 3.0). The infrared-absorbing fiber structure is characterized in that the particle diameter of the microparticles is 1 nm to 200 nm inclusive, and the content of the microparticles per unit area of the structure is 0.05 g / m2 to 8.0 g / m2 inclusive. The infrared-absorbing material microparticles that have absorbed solar energy generates heat so that the drying of water contained in the structure can be promoted.

Description

Quick-drying infrared absorbing fiber structure and clothing using the same

[0001] The present invention relates to infrared-absorbing fiber structures such as woven fabrics, knitted fabrics and nonwoven fabrics obtained by processing infrared-absorbing fibers having infrared-absorbing material particles selected from tungsten oxide particles or composite tungsten oxide particles incorporated on the surface and / or inside thereof, and to clothing such as sports underwear and swimwear that uses the infrared-absorbing fiber structures. In particular, the present invention relates to improvements in infrared-absorbing fiber structures and clothing that are excellent in quick-drying properties.

[0002] Conventionally, clothing such as sports underwear and swimwear has been associated with discomfort caused by sweating and persistent wetness, which is a problem due to the poor drying properties of the fiber structures used in sports underwear, swimwear, and other clothing, resulting in discomfort associated with a chilly sensation.

[0003] To improve the drying properties of textile structures, hydrophobic synthetic fibers such as polyester and polyamide fibers have been widely used. However, these fibers have not achieved the expected drying speed and have been insufficient to eliminate the cold and uncomfortable feeling that occurs when the textile structures become wet.

[0004] To solve this problem, Patent Document 1 discloses a sheath-core composite structure textured yarn made of two types of polyester multifilaments and a fabric using the same, with the aim of achieving quick-drying properties. According to Patent Document 1, although the cross-sectional shape of the single yarn of the polyester multifilament used in the core of the sheath-core composite structure textured yarn is basically arbitrary, it is stated that the cross-sectional shape of the single yarn of the core affects quick-drying properties, and that when the cross-sectional shape of the single yarn of the polyester multifilament is made round, fiber diffusibility and quick-drying properties are achieved (see paragraph 0018).

[0005] JP 2010-174424 A

[0006] However, the cross-sectional shape of a single yarn of the polyester multifilament used for the core also affects the texture of the resulting fabric, etc., and for example, it is known that in polyester fibers, the gloss increases when the cross-sectional shape of the single yarn is Y-shaped.

[0007] For this reason, when the cross section of a single yarn of a polyester multifilament is made round so as to obtain the diffusibility and quick-drying properties of polyester fibers, there is a problem that other properties such as gloss cannot be obtained.

[0008] The present invention has been made in light of these problems, and an object of the present invention is to provide an infrared-absorbing fiber structure that can achieve quick-drying properties regardless of the cross-sectional shape of the single fibers that constitute fiber structures such as woven fabrics, knitted fabrics, and nonwoven fabrics, and clothing using the same.

[0009] That is, a first aspect of the present invention is a quick-drying infrared absorbing fiber structure obtained by processing an infrared absorbing fiber having one or more infrared absorbing material particles selected from tungsten oxide particles or composite tungsten oxide particles contained on the surface and / or inside thereof, wherein the particle diameter of the infrared absorbing material particles is 1 nm or more and 200 nm or less, and the content of the infrared absorbing material particles per unit area of ​​the infrared absorbing fiber structure is 0.05 g / m 2 8.0g / m or more 2 The present invention is characterized by the following:

[0010] A second aspect of the present invention is the fast-drying infrared-absorbing fiber structure according to the first aspect, wherein the tungsten oxide fine particles are represented by the general formula WO X (wherein W is tungsten, O is oxygen, and 2.45≦X≦2.999), and the composite tungsten oxide particles are represented by the general formula M Y WO Z(wherein M element is one or more 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, 2.2≦Z≦3.0) and is a composite tungsten oxide fine particle having a hexagonal crystal structure. A third invention is the fast-drying infrared-absorbing fiber structure according to the second invention, characterized in that: The fourth invention is characterized in that the M element of the composite tungsten oxide microparticles is one or more elements selected from the group consisting of Cs, Rb, K, Tl, In, Ba, Li, Ca, Sr, Fe, and Sn. The fourth invention is characterized in that the quick-drying infrared absorbing fiber structure according to the first or second invention further contains far-infrared emitting material microparticles on the surface and / or inside of the infrared absorbing fiber, and the content of the far-infrared emitting material microparticles per unit area of ​​the infrared absorbing fiber structure is 0.10 g / m 2 The present invention is characterized in that:

[0011] Next, the fifth invention according to the present invention is an infrared absorbing fiber structure having quick-drying properties according to the first or second invention, characterized in that the infrared absorbing fiber is a fiber selected from synthetic fibers, semi-synthetic fibers, natural fibers, regenerated fibers, inorganic fibers, or mixed yarns obtained by blending, doubling, or mixing these fibers; the sixth invention is an infrared absorbing fiber structure having quick-drying properties according to the fifth invention, characterized in that the synthetic fiber is any synthetic fiber selected from polyurethane fibers, polyamide fibers, acrylic fibers, polyester fibers, polyolefin fibers, polyvinyl alcohol fibers, polyvinylidene chloride fibers, polyvinyl chloride fibers, and polyether ester fibers; the seventh invention is an infrared absorbing fiber structure having quick-drying properties according to the sixth invention, characterized in that the synthetic fiber is a synthetic fiber selected from polyamide fibers; the eighth invention is an infrared absorbing fiber structure having quick-drying properties according to the seventh invention, characterized in that the polyamide fiber is nylon 6; and the ninth invention is In the quick-drying infrared absorbing fiber structure according to the eighth aspect of the present invention, 0.33The tenth invention is characterized in that in the infrared-absorbing fiber structure having quick-drying properties described in the fifth invention, the semi-synthetic fiber is any one selected from the group consisting of cellulose-based fiber, protein-based fiber, chlorinated rubber, and hydrochloric rubber. The eleventh invention is characterized in that in the infrared-absorbing fiber structure having quick-drying properties described in the fifth invention, the natural fiber is any one selected from the group consisting of plant fiber, animal fiber, and mineral fiber. The twelfth invention is characterized in that in the infrared-absorbing fiber structure having quick-drying properties described in the fifth invention, the recycled fiber is any one selected from the group consisting of cellulose-based fiber, protein-based fiber, alginate fiber, rubber fiber, chitin fiber, and mannan fiber. Furthermore, the thirteenth invention is characterized in that clothing uses the infrared-absorbing fiber structure having quick-drying properties described in the first or second invention.

[0012] The infrared absorbing fiber structure and clothing according to the present invention are constructed using infrared absorbing fibers containing one or more infrared absorbing material particles selected from tungsten oxide particles or composite tungsten oxide particles on the surface and / or inside thereof, the particle diameter of the infrared absorbing material particles is 1 nm or more and 200 nm or less, and the content of the infrared absorbing material particles per unit area of ​​the infrared absorbing fiber structure is 0.05 g / m 2 8.0g / m or more 2 Since the above-mentioned range is set, it is possible to realize the quick-drying properties of the infrared absorbing fiber structure and the clothing, regardless of the cross-sectional shape of the single yarn of the fiber.

[0013] Furthermore, since there is a high degree of freedom in the cross-sectional shape of the single yarn in the fiber, it is possible to appropriately select the texture, such as gloss, of the infrared-absorbing fiber structure, which has the effect of providing infrared-absorbing fiber structures and clothing that are excellent in quick-drying properties and designability.

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

[0015] First, the infrared-absorbing fiber structure according to the present invention is constructed by processing infrared-absorbing fibers having inorganic infrared-absorbing material particles (tungsten oxide particles or composite tungsten oxide particles) contained on the surface and / or inside thereof, and examples of such infrared-absorbing fiber structures include woven fabrics, knitted fabrics, and nonwoven fabrics.

[0016] (1) Infrared-Absorbing Material Particles The infrared-absorbing fiber (near-infrared-absorbing fiber) according to the present invention can be obtained by incorporating infrared-absorbing material particles (particles having an infrared-absorbing function) on the surface and / or inside the fiber.

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

[0018] The tungsten oxide fine particles having an infrared absorbing function are represented by the general formula WO X (wherein W is tungsten, O is oxygen, and 2.45≦X≦2.999), and the composite tungsten oxide fine particles having an infrared absorbing function are fine particles represented by the general formula M Y WO Z (wherein M element is one or more 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, 2.2≦Z≦3.0) and are fine particles having a hexagonal crystal structure.

[0019] When tungsten oxide particles or composite tungsten oxide particles are applied to various fibers, they function as an infrared absorbing component.

[0020] The above general formula WO X Examples of tungsten oxide particles having the formula (2.45≦X≦2.999) include W 18 O 49 , W 20 O 58, W4O 11 If the value of X is 2.45 or more, the appearance of an undesired WO2 crystalline phase in the infrared-absorbing material particles can be completely prevented, and the chemical stability of the material can be ensured. Also, if the value of X is 2.999 or less, a sufficient amount of free electrons is generated, resulting in efficient infrared-absorbing material particles.

[0021] And, WO such that the range of X is 2.45≦X≦2.95. X The compound is included in the so-called Magneli phase.

[0022] In addition, the above general formula M Y WO Z and having a hexagonal crystal structure, examples of the composite tungsten oxide microparticles include composite tungsten oxide microparticles containing, as a preferred M element, one or more elements selected from the group consisting of Cs, Rb, K, Tl, In, Ba, Li, Ca, Sr, Fe, and Sn.

[0023] The amount Y of the added element M must 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 properties can be obtained with an amount added around this value. A typical example is Cs 0.33 WO3, Rb 0.33 WO3, K 0.33 WO3, Ba 0.33 Examples of suitable materials include WO3, and as long as Y and Z fall within the above ranges, useful infrared absorption properties can be obtained.

[0024] (2) Particle size of infrared-absorbing material particles It is important that the particle size of the infrared-absorbing material particles does not cause problems during the fiberization process, such as spinning and drawing, and it is preferable that the average particle size of the infrared-absorbing material particles is 200 nm or less. If the average particle size of the particles is 200 nm or less, it is possible to avoid deterioration of spinnability, such as clogging of the spinneret (nozzle) and thread breakage during the spinning process. Even if spinning can be performed, problems such as thread breakage may occur during the drawing process, and it may also be difficult to uniformly mix and disperse the particles in the spinning raw material. From this perspective, it is preferable that the average particle size is 200 nm or less.

[0025] On the other hand, considering the design properties, such as dyeability, of infrared-absorbing fiber structures containing infrared-absorbing material particles on the fiber surface and / or interior, the infrared-absorbing material particles must efficiently absorb near-infrared rays while maintaining transparency. Infrared-absorbing material particles selected from tungsten oxide particles or composite tungsten oxide particles transmit light in the visible light range (wavelengths of 380 nm to 780 nm) and significantly absorb light in the near-infrared range, particularly wavelengths around 780 to 2200 nm, resulting in a transmission color tone that is often blue to green. Therefore, while transparency can be ensured by making the particle size (particle diameter) of the infrared-absorbing material particles smaller than 200 nm, when greater transparency is important, the particle size should be 100 nm or less. On the other hand, since a particle diameter of 1 nm or more facilitates industrial production, the particle size (particle diameter) of the infrared-absorbing material particles must be 1 nm or more and 200 nm or less. Ensuring such transparency in visible light allows the infrared-absorbing fiber structure to be freely dyed. In particular, unlike ceramic particles with photothermal conversion functions, such as nitrides and carbides of titanium and zirconium, which have been known to be added to photothermal conversion fibers in the past, the tungsten oxide particles and composite tungsten oxide particles of the infrared-absorbing material particles used in the present invention are transparent in the visible light range, allowing for a high degree of freedom in dyeing and excellent color development after dyeing.

[0026] Incidentally, infrared rays absorbed by infrared-absorbing material particles are converted into heat. When an infrared-absorbing fiber structure is irradiated with infrared rays or sunlight, the infrared-absorbing material particles absorb the infrared rays and generate heat, which makes it possible to volatilize moisture such as sweat absorbed by the infrared-absorbing fiber structure regardless of the cross-sectional shape of the single fiber yarn.

[0027] (3) Content of infrared-absorbing material particles contained on the surface and / or inside of the fiber The above-mentioned tungsten oxide particles and composite tungsten oxide particles have extremely high infrared absorption capacity per unit weight, so compared to ITO or ATO, they can be used in amounts of about 1 / 4 to 1 / 10. When the composite tungsten oxide particles have a hexagonal crystal structure and K, Rb, or Cs is used as the M element, they have particularly excellent infrared absorption capacity for wavelengths of 780 nm or more. Therefore, infrared-absorbing fiber structures using infrared-absorbing fibers containing these composite tungsten oxide particles more effectively volatilize the moisture absorbed by the infrared-absorbing fiber structure by heat generation due to infrared absorption, thereby achieving quick-drying properties as clothing.

[0028] The content of infrared-absorbing material particles (tungsten oxide particles or composite tungsten oxide particles) contained in the infrared-absorbing fiber is preferably set between 0.001% and 80% by weight, and more preferably between 0.005% and 50% by weight, taking into consideration the weight of the fiber after addition of the infrared-absorbing material particles and the raw material cost. If the content of infrared-absorbing material particles is 0.001% by weight or more, a sufficient infrared absorption effect can be obtained even if the fabric (infrared-absorbing fiber structure) is thin. If the content is 80% by weight or less, deterioration of spinnability due to clogging of the spinneret (nozzle) or yarn breakage during the spinning process can be avoided. If the content is 50% by weight or less, the amount of infrared-absorbing material particles added can be small, so the physical properties of the fiber are not impaired.

[0029] (4) The content of infrared absorbing material particles per unit area of ​​the infrared absorbing fiber structure is 0.05 g / m. 2 8.0g / m or more 2or less, preferably 0.1 g / m 2 5.0g / m or more 2 or less, more preferably 0.3 g / m 2 4.5g / m or more 2 The content of the infrared absorbing material particles per unit area of ​​the infrared absorbing fiber structure is 0.05 g / m or less. 2 If the temperature is above this level, the infrared absorbing material particles that absorb infrared rays generate heat, accelerating the drying of the moisture contained in the infrared absorbing fiber structure.

[0030] On the other hand, the content of infrared absorbing material particles per unit area of ​​the infrared absorbing fiber structure is 8.0 g / m 2 If the content exceeds 0.3 g / m, the quick-drying effect will not improve to a degree proportional to the excess amount. Therefore, the content of the infrared absorbing material particles per unit area of ​​the infrared absorbing fiber structure is preferably 0.3 g / m. 2 4.5g / m or more 2 The content of the infrared absorbing material particles per unit area is 0.3 g / m or less. 2 4.5g / m or more 2 If the content of the infrared-absorbing fine particles per unit area of ​​the infrared-absorbing fiber structure is excessive, it may be difficult to develop the color of the infrared-absorbing fiber structure, depending on the color to be dyed.

[0031] (5) Far-infrared emitting material microparticles In addition to the above-mentioned infrared absorbing material microparticles, the infrared absorbing fiber may further contain far-infrared emitting material microparticles capable of emitting far-infrared rays on the surface and / or inside thereof. Examples of far-infrared emitting material microparticles include metal oxides such as ZrO2, SiO2, TiO2, Al2O3, MnO2, MgO, Fe2O3, and CuO; carbides such as ZrC, SiC, and TiC; and nitrides such as ZrN, Si3N4, and AlN.

[0032] The far-infrared emitting material particles have the ability to receive the energy absorbed by the infrared-absorbing material particles, convert the energy into heat energy of mid- to far-infrared wavelengths, and radiate it. Therefore, when the infrared-absorbing material particles and the far-infrared emitting material particles coexist on the surface and / or inside of the infrared-absorbing fiber, the solar energy absorbed by the infrared-absorbing material particles is efficiently consumed on the surface and / or inside of the infrared-absorbing fiber, thereby further improving the quick-drying property.

[0033] The content of the far-infrared emitting material particles per unit area of ​​the infrared absorbing fiber structure is 0.10 g / m 2 5.0g / m or more 2 The following is an example:

[0034] (6) Infrared-absorbing fiber The fiber used in the infrared-absorbing fiber according to the present invention can be selected from various types depending on the application, and any of synthetic fibers, semi-synthetic fibers, natural fibers, regenerated fibers, inorganic fibers, and mixed yarns obtained by blending, doubling, or mixing these may be used. Furthermore, synthetic fibers are preferred in view of the ease with which inorganic fine particles can be incorporated into the fiber and the durability of heat retention.

[0035] (6-1) Synthetic Fibers The synthetic fibers used in the infrared-absorbing fiber according to the present invention are not particularly limited, and examples thereof include polyurethane fibers, polyamide fibers, acrylic fibers, polyester fibers, polyolefin fibers, polyvinyl alcohol fibers, polyvinylidene chloride fibers, polyvinyl chloride fibers, and polyether ester fibers.

[0036] For example, polyamide fibers include nylon, nylon 6, nylon 66, nylon 11, nylon 610, nylon 612, aromatic nylon, and aramid.

[0037] Further, examples of acrylic fibers include polyacrylonitrile, acrylonitrile-vinyl chloride copolymer, modacrylic, and the like.

[0038] Further, examples of polyester fibers include polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, and polyethylene naphthalate.

[0039] Examples of polyolefin fibers include polyethylene, polypropylene, and polystyrene.

[0040] Further, for example, polyvinyl alcohol fibers include vinylon.

[0041] Further, for example, polyvinylidene chloride fibers include vinylidene.

[0042] Further, for example, polyvinyl chloride fibers include polyvinyl chloride.

[0043] Further, examples of polyether ester fibers include Rexe and Success.

[0044] (6-2) Semi-synthetic Fibers When the fibers used in the infrared absorbing fiber according to the present invention are semi-synthetic fibers, examples thereof include cellulose-based fibers, protein-based fibers, chlorinated rubber, and hydrochloric rubber.

[0045] Further, examples of cellulosic fibers include acetate, triacetate, and acetate oxide.

[0046] Further, for example, protein fibers include Promix and the like.

[0047] (6-3) Natural Fibers When the fibers used in the infrared absorbing fiber according to the present invention are natural fibers, examples thereof include plant fibers, animal fibers, and mineral fibers.

[0048] Examples of plant fibers include cotton, kapok, flax, hemp, jute, Manila hemp, sisal, New Zealand hemp, ramie, palm, rush, and wheat straw.

[0049] Examples of animal fibers include wool such as sheep's wool, goat's hair, mohair, cashmere, alpaca, angora, camel, and vicuna, as well as silk, down, and feathers.

[0050] Further, examples of mineral fibers include asbestos.

[0051] (6-4) Regenerated Fibers When the fibers used in the infrared absorbing fiber according to the present invention are regenerated fibers, examples thereof include cellulose-based fibers, protein-based fibers, alginate fibers, rubber fibers, chitin fibers, and mannan fibers.

[0052] Examples of cellulosic fibers include rayon, viscose rayon, cupro, polynosic, and cuprammonium rayon.

[0053] Examples of protein fibers include casein fiber, peanut protein fiber, corn protein fiber, soy protein fiber, and regenerated silk.

[0054] (6-5) Inorganic Fibers When the fibers used in the infrared absorbing fiber according to the present invention are inorganic fibers, examples thereof include metal fibers, carbon fibers, and silicate fibers.

[0055] Examples of metal fibers include metal fibers, gold threads, silver threads, and heat-resistant alloy fibers.

[0056] Examples of silicate fibers include glass fibers, slag fibers, and rock fibers.

[0057] (7) Cross-sectional shape of infrared-absorbing fiber, etc. The cross-sectional shape of the infrared-absorbing fiber according to the present invention is not particularly limited, and examples thereof include circular, triangular, hollow, flat, Y-shaped, star-shaped, and sheath-core shapes. The inclusion of microparticles on the surface and / or inside of the fiber can take various shapes. For example, in the case of a sheath-core shape, the microparticles may be contained in either the core or sheath of the fiber. Furthermore, the shape of the infrared-absorbing fiber may be a filament (long fiber) or a staple (short fiber).

[0058] Furthermore, the infrared-absorbing fiber according to the present invention may contain, depending on the purpose, antioxidants, flame retardants, deodorizers, insect repellents, antibacterial agents, ultraviolet absorbers, and the like, within the range that does not impair the performance of the fiber.

[0059] (8) Method of incorporating infrared-absorbing material particles into the surface and / or interior of a fiber There is no particular limitation on the method of incorporating infrared-absorbing material particles into the surface and / or interior of a fiber according to the present invention. Examples include: (A) a method of directly mixing the infrared-absorbing material particles into a raw polymer of a synthetic fiber and spinning the resulting mixture; (B) a method of previously preparing a masterbatch in which the infrared-absorbing material particles are incorporated into a part of the raw polymer in high concentration, and then diluting this to a predetermined concentration before spinning; (C) a method of previously dispersing the infrared-absorbing material particles uniformly in a raw monomer or oligomer solution, synthesizing a target raw polymer using this dispersion, and simultaneously dispersing the infrared-absorbing material particles uniformly in the raw polymer, and then spinning the resulting mixture; and (D) a method of attaching the infrared-absorbing material particles to the surface of a fiber obtained by previously spinning the fiber using a binder or the like.

[0060] Here, a preferred example of the method described above in (B), in which a master batch is produced and diluted before spinning, 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 the fine particles are uniformly dispersed in the thermoplastic resin by uniformly melt-mixing tungsten oxide microparticles and / or composite tungsten oxide microparticle dispersion, thermoplastic resin powder or pellets, and, if necessary, other additives while removing the solvent using a mixer such as a Riboblender, tumbler, Nauta mixer, Henschel mixer, super mixer, or planetary mixer, or a kneader such as a Banbury mixer, kneader, roll, kneader-ruder, single-screw extruder, or twin-screw extruder.

[0062] Furthermore, after preparing a dispersion of tungsten oxide microparticles and / or composite tungsten oxide microparticles, the solvent of the dispersion can be removed by a known method, and the resulting powder can be uniformly melt-mixed with thermoplastic resin powder or pellets, and, if necessary, other additives, to produce a mixture in which the microparticles are uniformly dispersed in the thermoplastic resin.In addition, a method can be used in which the powder of tungsten oxide microparticles and / or composite tungsten oxide microparticles is directly added to a thermoplastic resin and uniformly melt-mixed.

[0063] A mixture of the tungsten oxide microparticles and / or composite tungsten oxide microparticles obtained by the above-described method and a thermoplastic resin is kneaded in a pent-type single-screw or twin-screw extruder and processed into pellets, thereby obtaining a masterbatch containing infrared-absorbing material microparticles.

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

[0065] Method (A): For example, when polyester fibers are used as the fibers, a dispersion of tungsten oxide microparticles and / or composite tungsten oxide microparticles is added to pellets of polyethylene terephthalate resin, a thermoplastic resin, and mixed uniformly in a blender, after which the solvent is removed. The mixture from which the solvent has been removed is melt-kneaded in a twin-screw extruder to obtain a masterbatch containing tungsten oxide microparticles and / or composite tungsten oxide microparticles. The resulting masterbatch containing tungsten oxide microparticles and / or composite tungsten oxide microparticles is melt-mixed at a temperature near the melting temperature of the resin and spun according to conventional methods.

[0066] Method (B): In the same manner as in (A), except that a masterbatch containing tungsten oxide microparticles and / or composite tungsten oxide microparticles that has been prepared in advance is used, a masterbatch containing tungsten oxide microparticles and / or composite tungsten oxide microparticles and a target amount of a masterbatch made of polyethylene terephthalate to which no microparticles have been added are melt-mixed at a temperature near the melting point of the resin, and spun in a conventional manner.

[0067] Method (C): For example, when polyurethane fibers are used as the fibers, a polymeric diol containing tungsten oxide microparticles and / or composite tungsten oxide microparticles is reacted with an organic diisocyanate in a twin-screw extruder to synthesize an isocyanate-terminated prepolymer, which is then reacted with a chain extender to produce a polyurethane solution (raw polymer). The polyurethane solution is then spun in the usual manner.

[0068] Method (D): For example, to attach infrared-absorbing material particles to the surface of natural fibers, a treatment solution is first prepared by mixing tungsten oxide particles and / or composite tungsten oxide particles with at least one binder resin selected from acrylic, epoxy, urethane, and polyester, and a solvent such as water. The natural fibers are then immersed in the treatment solution, or impregnated with the treatment solution by padding, printing, or spraying, and then dried, thereby attaching the tungsten oxide particles and / or composite tungsten oxide particles to the natural fibers. Method (D) can also be applied to the natural fibers described above, as well as semi-synthetic fibers, regenerated fibers, inorganic fibers, and blends, doubling, and mixed fibers thereof.

[0069] When carrying out the methods (A) to (D) above, the tungsten oxide microparticles and / or composite tungsten oxide microparticles may be dispersed by any method that can uniformly disperse the microparticles in a liquid. For example, methods such as a media stirring mill, a ball mill, a sand mill, and ultrasonic dispersion can be suitably applied.

[0070] Furthermore, the dispersion medium for the infrared-absorbing material particles is not particularly limited and can be selected according to the fibers to be mixed. For example, various common organic solvents such as alcohols, ethers, esters, ketones, aromatic compounds, and the like, or water can be used.

[0071] Furthermore, when the infrared-absorbing material particles are attached to or mixed with the fibers or the polymers that are their raw materials, a dispersion of the infrared-absorbing material particles may be directly mixed with the fibers or the polymers that are their raw materials. If necessary, the pH of the dispersion of the infrared-absorbing material particles may be adjusted by adding an acid or alkali to the dispersion, and it is also preferable to add various surfactants, coupling agents, etc. to further improve the dispersion stability of the particles.

[0072] In addition, in order to improve the weather resistance of the infrared-absorbing material particles, it is also preferable to coat the surfaces of the tungsten oxide particles and / or composite tungsten oxide particles with a compound containing one or more elements selected from silicon, zirconium, titanium, and aluminum. These compounds are basically transparent, and adding them does not reduce the visible light transmittance of the infrared-absorbing material particles, so the design properties of the fiber are not impaired.

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

[0074] As described above, the infrared-absorbing fiber according to the present invention is capable of absorbing infrared rays by incorporating small amounts of tungsten oxide microparticles and / or composite tungsten oxide microparticles as infrared-absorbing components on the surface and / or inside of the fiber.

[0075] The infrared-absorbing fibers are processed into long fibers or short fibers depending on the application, and then spun into woven or knitted fabrics by known methods to form infrared-absorbing fiber structures. The infrared-absorbing fibers are also processed by known methods to form nonwoven fabrics, which then become infrared-absorbing fiber structures. Of course, the yarns spun from the infrared-absorbing fibers (spun yarns) may be colorless or dyed. Furthermore, infrared-absorbing fiber structures such as woven fabrics, knitted fabrics, and nonwoven fabrics may also be dyed partially or entirely.

[0076] The infrared-absorbing fiber structure according to the present invention is weather-resistant and colorless, and because the amount of infrared-absorbing fine particles added is small, there is a high degree of freedom in coloring the fiber structure and the resulting clothing, such as dyeing, without impairing the design, and basic physical properties of the fiber, such as strength and elongation, can be avoided.As a result, the infrared-absorbing fiber structure according to the present invention has quick-drying properties and can be used in clothing such as sports underwear and swimsuits.

[0077] (9) Method for Producing Infrared-Absorbing Material Particles Next, the method for producing infrared-absorbing material particles according to the present invention will be described. X and tungsten oxide fine particles represented by the general formula M Y WO Z The method for producing composite tungsten oxide particles represented by the formula (I) will be described below as an example.

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

[0079] The tungsten compound starting material is preferably at least one selected from tungsten trioxide powder, tungsten dioxide powder, tungsten oxide hydrate, tungsten hexachloride powder, ammonium tungstate powder, tungsten oxide hydrate powder obtained by dissolving tungsten hexachloride in alcohol and then drying, tungsten oxide hydrate powder obtained by dissolving tungsten hexachloride in alcohol and then adding water to precipitate and then drying the precipitate, tungsten compound powder obtained by drying an aqueous solution of ammonium tungstate, and metallic tungsten powder.

[0080] Here, when producing tungsten oxide microparticles, from the viewpoint of easy production process, more preferably use tungsten oxide hydrate powder, tungsten trioxide or the tungsten compound powder obtained by drying ammonium tungstate aqueous solution; when producing composite tungsten oxide microparticles, if starting material is solution, from the viewpoint that each element can be easily mixed uniformly, more preferably use ammonium tungstate aqueous solution or tungsten hexachloride solution.By using these raw materials and heat treating them in inert gas atmosphere or reducing gas atmosphere, can obtain the tungsten oxide microparticles and / or composite tungsten oxide microparticles with the infrared absorption function described above.

[0081] In addition, the starting material of the composite tungsten oxide microparticles with infrared absorption function is the same tungsten compound as the starting material of the microparticles with infrared absorption function containing the above-mentioned tungsten oxide microparticles, but further contains the tungsten compound containing M element in the form of simple element or compound as the starting material.Here, in order to manufacture the tungsten compound as the starting material in which each component is uniformly mixed at the molecular level, it is preferable to mix each raw material in a solution, and it is preferable that the tungsten compound containing M element is soluble in a solvent such as water or organic solvent.For example, tungstate, chloride salt, nitrate, sulfate, oxalate, oxide, carbonate, hydroxide, etc. containing M element can be mentioned, but is not limited to these, and it is preferable that it can be in a solution state.

[0082] The raw materials for producing the above-mentioned tungsten oxide microparticles and composite tungsten oxide microparticles will be explained in detail again below.

[0083] General formula WO X The tungsten compound, which is the starting material for obtaining the tungsten oxide microparticles represented by the formula (I), can be any one or more selected from tungsten trioxide powder, tungsten dioxide powder, tungsten oxide hydrate, tungsten hexachloride powder, ammonium tungstate powder, tungsten oxide hydrate powder obtained by dissolving tungsten hexachloride in alcohol and then drying, tungsten oxide hydrate powder obtained by dissolving tungsten hexachloride in alcohol and then adding water to precipitate and then drying the precipitate, tungsten compound powder obtained by drying an ammonium tungstate aqueous solution, and metallic tungsten powder. However, from the viewpoint of ease of the production process, it is more preferable to use tungsten oxide hydrate powder, tungsten trioxide powder, or tungsten compound powder obtained by drying an ammonium tungstate aqueous solution.

[0084] General formula M containing M element Y WO ZThe starting material for obtaining the composite tungsten oxide microparticles represented by the formula (I) can be a powder obtained by mixing one or more powders selected from tungsten trioxide powder, tungsten dioxide powder, tungsten oxide hydrate, tungsten hexachloride powder, ammonium tungstate powder, tungsten oxide hydrate powder obtained by dissolving tungsten hexachloride in alcohol and then drying, tungsten oxide hydrate powder obtained by dissolving tungsten hexachloride in alcohol and then adding water to precipitate and then drying the precipitate, tungsten compound powder obtained by drying an aqueous solution of ammonium tungstate, and metallic tungsten powder with the above-mentioned M element-containing simple substance or compound powder.

[0085] Furthermore, when the tungsten compound, which is the starting material for obtaining the composite tungsten oxide microparticles, is in the form of a solution or dispersion, the elements can be easily mixed uniformly.

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

[0087] Similarly, it is also preferable that the starting material for the composite tungsten oxide microparticles is a powder obtained by mixing a dispersion obtained by dissolving tungsten hexachloride in alcohol and then adding water to form a precipitate with a powder of a simple substance or compound containing the M element, or a solution of a compound containing the M element, and then drying the resulting powder.

[0088] Examples of compounds containing the element M include, but are not limited to, tungstates, chlorides, nitrates, sulfates, oxalates, oxides, carbonates, hydroxides, etc. of the element M. Any compound that can be made into a solution may be used. Furthermore, when the composite tungsten oxide microparticles are produced industrially, using a tungsten oxide hydrate powder or tungsten trioxide and a carbonate or hydroxide of the element M is a preferred production method, since no harmful gases are generated during the heat treatment stage or the like.

[0089] Here, the heat treatment conditions for tungsten oxide microparticles and composite tungsten oxide microparticles in an inert atmosphere are preferably 650°C or higher. Starting materials heat-treated at 650°C or higher have sufficient infrared absorption function and are efficient as microparticles with infrared absorption function. It is preferable to use an inert gas such as Ar or N2. Furthermore, as heat treatment conditions in a reducing atmosphere, it is preferable to first heat-treat the starting materials in a reducing gas atmosphere at 100°C or higher and 850°C or lower, and then heat-treat them in an inert gas atmosphere at 650°C or higher and 1200°C or lower. The reducing gas used here is not particularly limited, but H2 is preferred. Furthermore, when H2 is used as the reducing gas, the composition of the reducing atmosphere preferably contains 0.1% or more H2 by volume, more preferably 2% or more. A volume ratio of 0.1% or more H2 allows for efficient reduction.

[0090] Examples of the present invention will be specifically described below, along with comparative examples.

[0091] [Example 1] Cs 0.33 10 parts by weight of WO3 fine particles, 80 parts by weight of toluene, and 10 parts by weight of a dispersant for dispersing fine particles were mixed, and the mixture (Cs 0.33 Dispersion treatment of WO3 fine particles, toluene, and a dispersant for dispersing fine particles was carried out using a media agitation mill, and Cs 0.33 A dispersion A of WO3 fine particles was prepared.

[0092] Then, using a spray dryer, Cs 0.33 Toluene was removed from dispersion A of WO3 fine particles, and Cs with a particle diameter of 32 nm was obtained. 0.33 A dispersion powder A of WO3 fine particles was obtained.

[0093] The particle diameter is Cs 0.33 From the transmission electron microscope image of the WO3 fine particles (composite tungsten oxide fine particles), the above Cs was detected using an image processing device. 0.33 It can be determined by measuring the particle diameter of 100 WO3 particles (composite tungsten oxide particles) and calculating the average value.

[0094] The obtained Cs 0.3320% by weight of WO3 microparticle dispersion powder A and the remainder nylon 6 pellets were premixed in a tumbler mixer, and then the mixture was melt-kneaded and extruded in a twin-screw vent extruder set at a temperature of 280°C. The extruded strands were cut into pellets to obtain masterbatch A.

[0095] Next, Cs 0.33 Masterbatch A containing WO3 fine particles was melt-spun using a round-hole nozzle for producing normal cross-section yarn to produce infrared-absorbing filament yarn (50 denier / 16 filaments), that is, infrared-absorbing filament yarn having a thickness of 50 denier and 16 bundled fibers (filaments).

[0096] The obtained infrared absorbing filament yarn and spandex fiber (40 denier / 1 filament) of polyurethane elastic fiber were used to knit tricot A according to Example 1.

[0097] The obtained tricot had a density of 0.17 g / m per unit area. 2 Cs 0.33 The mixture was adjusted so as to contain WO3 fine particles (composite tungsten oxide fine particles).

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

[0099] The sample A1 thus obtained was immersed in distilled water, and the moisture content was adjusted to 100% using filter paper to obtain sample A2 according to Example 1. Sample A2 was irradiated with light from an incandescent lamp (E26 PRS500W photographic eye lamp manufactured by Iwasaki Electric Co., Ltd.) at a distance of 80 cm in an artificial climate chamber maintained at a constant temperature and humidity of 20°C and 65% relative humidity, and the change in fabric weight (moisture content) was measured.

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

[0101] The moisture content was calculated using the following formula:

[0102] Moisture content (%) = {[weight of sample A2 after irradiation - weight of sample A1 (before immersion)] / [weight of sample A2 before irradiation adjusted to a moisture content of 100% - weight of sample A1 (before immersion)]} × 100 The faster the rate of decrease in moisture content, the more rapid the drying property.

[0103] [Example 2] The above mixture (Cs 0.33 The dispersion time of WO3 fine particles, toluene, and a dispersant for fine particle dispersion was adjusted using a medium stirring mill to obtain Cs with a particle diameter of 13 nm. 0.33 Tricot B according to Example 2 was produced in the same manner as in Example 1, except that WO3 dispersed powder B was obtained.

[0104] Then, sample B1 was taken from the produced tricot B, and the taken sample B1 was immersed in distilled water to prepare sample B2 of Example 2. After that, the change in fabric weight (moisture content) of sample B2 of Example 2 was measured in the same manner as in Example 1.

[0105] The results are also shown in Table 1.

[0106] [Example 3] The above mixture (Cs 0.33 The dispersion time of WO3 fine particles, toluene, and a dispersant for fine particle dispersion was adjusted using a medium stirring mill to obtain Cs with a particle diameter of 78 nm. 0.33 Tricot C according to Example 3 was prepared in the same manner as in Example 1, except that WO3 dispersed powder C was obtained.

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

[0108] The results are also shown in Table 1.

[0109] [Example 4] The above mixture (Cs 0.33 The dispersion time of WO3 fine particles, toluene, and a dispersant for fine particle dispersion was adjusted using a medium stirring mill to obtain Cs with a particle diameter of 126 nm. 0.33 Tricot D according to Example 4 was prepared in the same manner as in Example 1, except that WO3 dispersed powder D was obtained.

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

[0111] The results are also shown in Table 1.

[0112] [Example 5] The above mixture (Cs 0.33 The dispersion time of WO3 fine particles, toluene, and a dispersant for fine particle dispersion was adjusted using a medium stirring mill to obtain Cs with a particle diameter of 185 nm. 0.33 Tricot E according to Example 5 was prepared in the same manner as in Example 1, except that WO3 dispersed powder E was obtained.

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

[0114] The results are also shown in Table 1.

[0115] [Comparative Example 1] Cs 0.33 Nylon 6 pellets containing no WO3 fine particles were melt spun into nylon filament yarn (50 denier / 16 filaments) using a round-hole nozzle for producing normal cross-section yarn.

[0116] The obtained nylon filament yarn (50 denier / 16 filaments) and spandex fiber (40 denier / 1 filament) were used to knit tricot F according to Comparative Example 1.

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

[0118] The results are also shown in Table 1.

[0119]

[0120] [Confirmation] (1) Tricots A to E according to Examples 1 to 5 It was confirmed that the tricots A to E according to Examples 1 to 5, which used infrared absorbing filament yarn, were dried with moisture removed in 60 minutes as shown in Table 1. (2) Tricot F according to Comparative Example 1 In contrast, Cs 0.33It was confirmed that moisture remained in tricot F according to Comparative Example 1, which used nylon filament yarn containing no WO3 microparticles, even after 60 minutes. (3) These results confirm that tricots A to E according to Examples 1 to 5, which used infrared-absorbing filament yarn, have quick-drying properties compared to Comparative Example 1.

[0121] The infrared absorbing fiber structure according to the present invention has excellent quick-drying properties and is therefore industrially applicable to sports underwear, swimwear, and the like.

Claims

1. An infrared absorbing fiber structure obtained by processing an infrared absorbing fiber having one or more infrared absorbing material particles selected from tungsten oxide particles or composite tungsten oxide particles contained on the surface and / or inside thereof, wherein the particle diameter of the infrared absorbing material particles is 1 nm or more and 200 nm or less, and the content of the infrared absorbing material particles per unit area of ​​the infrared absorbing fiber structure is 0.05 g / m 2 8.0g / m or more 2 1. A quick-drying infrared absorbing fiber structure, characterized in that:

2. The tungsten oxide fine particles are represented by the general formula WO X (wherein W is tungsten, O is oxygen, and 2.45≦X≦2.999), and the composite tungsten oxide particles are represented by the general formula M Y WO Z 2. The quick-drying infrared absorbing fiber structure according to claim 1, characterized in that the M element is one or more 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, and 0.001≦Y≦1.0, 2.2≦Z≦3.0), and is a composite tungsten oxide microparticle having a hexagonal crystal structure.

3. The quick-drying infrared absorbing fiber structure according to claim 2, characterized in that the M element of the composite tungsten oxide microparticles is one or more elements selected from the group consisting of Cs, Rb, K, Tl, In, Ba, Li, Ca, Sr, Fe and Sn.

4. The infrared absorbing fiber further contains far-infrared emitting material particles on the surface and / or inside thereof, and the content of the far-infrared emitting material particles per unit area of ​​the infrared absorbing fiber structure is 0.10 g / m 2 3. The infrared absorbing fiber structure having quick-drying properties according to claim 1 or 2, characterized in that:

5. The infrared absorbing fiber structure having quick-drying properties according to claim 1 or 2, characterized in that the infrared absorbing fiber is selected from synthetic fibers, semi-synthetic fibers, natural fibers, regenerated fibers, inorganic fibers, or mixed yarns obtained by blending, doubling, or mixing these fibers.

6. The quick-drying infrared absorbing fiber structure according to claim 5, characterized in that the synthetic fiber is any one selected from the group consisting of polyurethane fiber, polyamide fiber, acrylic fiber, polyester fiber, polyolefin fiber, polyvinyl alcohol fiber, polyvinylidene chloride fiber, polyvinyl chloride fiber, and polyether ester fiber.

7. The infrared shielding fiber structure having quick-drying properties according to claim 6, characterized in that the synthetic fiber is a synthetic fiber selected from polyamide-based fibers.

8. The infrared ray shielding fiber structure having quick-drying properties according to claim 7, characterized in that the polyamide fiber is nylon 6.

9. Cs 0.33 The quick-drying infrared shielding fiber structure according to claim 8, characterized in that it is made of a tricot knitted from an infrared absorbing filament yarn obtained by melt spinning a master batch of nylon 6 containing WO3 microparticles and a polyurethane elastic fiber.

10. The infrared absorbing fiber structure having quick-drying properties according to claim 5, characterized in that the semi-synthetic fiber is any one of semi-synthetic fibers selected from the group consisting of cellulose-based fiber, protein-based fiber, chlorinated rubber, and hydrochloric rubber.

11. The infrared absorbing fiber structure having quick-drying properties according to claim 5, characterized in that the natural fiber is any natural fiber selected from the group consisting of vegetable fibers, animal fibers, and mineral fibers.

12. The infrared absorbing fiber structure having quick-drying properties as described in claim 5, characterized in that the regenerated fiber is any regenerated fiber selected from the group consisting of cellulose-based fibers, protein-based fibers, alginate fibers, rubber fibers, chitin fibers, and mannan fibers.

13. Clothing characterized by using the infrared absorbing fiber structure having quick-drying properties described in claim 1 or 2.

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