Fabric product

Abstract

Provided is a fabric product containing synthetic fibers, wherein the synthetic fibers contain first fibers including composite tungsten oxide particles, and second fibers including titanium oxide particles at a ratio of 1 mass % or more.

Description

Textile products

[0001] This invention relates to textile products.

[0002] Traditionally, research has been conducted on fibers and fabrics that possess various functions utilizing sunlight.

[0003] For example, Patent Document 1 discloses a near-infrared absorbing fiber having tungsten oxide fine particles and / or composite tungsten oxide fine particles on its surface and / or inside, characterized in that the content of the fine particles is 0.001% to 80% by weight relative to the solid content of the fiber.

[0004] According to Patent Document 1, a fiber containing tungsten oxide fine particles and / or composite tungsten oxide fine particles as a heat-absorbing component is described as having the properties of efficiently absorbing heat rays from sunlight and the like with only a small amount of the fine particles, resulting in a fiber with heat retention, good weather resistance, low cost, excellent transparency, and not impairing the design of textile products.

[0005] Patent Document 2 discloses a multilayer sunshade sheet comprising at least one layer of synthetic resin film and at least one layer of fibrous fabric, wherein the synthetic resin film contains titanium dioxide in a proportion of 10% by mass or more and 70% by mass or less.

[0006] According to Patent Document 2, it is possible to obtain a multi-layer sunshade sheet that is excellent in both its ability to block sunlight and the cooling effect associated with that ability to block sunlight.

[0007] Patent Document 3 discloses a photothermal conversion resin composition and a photothermal conversion fiber, which include a thermoplastic resin and tungsten oxide-based photothermal conversion particles and heat-retaining particles dispersed in the thermoplastic resin, wherein the amount of photothermal conversion particles is less than 0.01 to 0.50% by mass and the amount of heat-retaining particles is 0.01 to 70% by mass or less.

[0008] According to the fiber disclosed in Patent Document 3, it is possible to effectively convert sunlight into heat, thereby providing excellent cold protection, and also to give a highly white color tone.

[0009] Japanese Patent Publication No. 2006-132042, International Publication No. 2014 / 185440, Japanese Patent Publication No. 2020-075989

[0010] Incidentally, while it has long been widely known that ultraviolet rays are harmful to the human body, in recent years there has also been growing discussion about the adverse effects of near-infrared rays on the skin.

[0011] Therefore, there is a growing demand for fabric products that can block ultraviolet and near-infrared rays from sunlight.

[0012] One aspect of the present invention aims to provide a fabric product that can block ultraviolet and near-infrared rays.

[0013] A fabric product according to one aspect of the present invention is a fabric product containing chemical fibers, wherein the chemical fibers include a first fiber containing composite tungsten oxide particles and a second fiber containing titanium oxide particles in a proportion of 1% by mass or more.

[0014] According to one aspect of the present invention, a fabric product capable of shielding ultraviolet and near-infrared rays can be provided.

[0015] Figure 1 is an explanatory diagram of fibers used in a fabric product according to one embodiment of the present disclosure. Figure 2 is an explanatory diagram of a heat shielding effect test. Figure 3 is a diagram showing the results of the heat shielding effect test in Experimental Example 3.

[0016] The following describes specific examples of fabric products according to one embodiment of the present disclosure (hereinafter referred to as "this embodiment"). However, the present invention is not limited to the following embodiments, and various modifications and substitutions can be made to the following embodiments without departing from the scope of the present invention.

[0017] In this specification, the names of the components may be described with the addition of "first," "second," "third," etc. For example, they may be described as "first fiber," "second fiber," "third fiber," etc. The "first," "second," and "third" added to the fibers are merely to identify each component and prevent confusion during description, and do not indicate arrangement or priority. When there is no risk of confusion or when referring collectively, they may be written as "fiber." [Fabric Products] The inventors of the present invention have studied fabric products that can shield against ultraviolet and near-infrared rays. They have found that by providing a fabric product containing a first fiber containing composite tungsten oxide particles that can mainly absorb near-infrared rays and a second fiber containing titanium oxide particles that can mainly shield against ultraviolet rays, it is possible to shield against ultraviolet and near-infrared rays, and have completed the present invention.

[0018] Therefore, the fabric product of this embodiment is a fabric product containing chemical fibers, and the chemical fibers may include the first fiber and the second fiber described below. (1) Regarding the fibers contained in the fabric product, the fabric product of this embodiment may contain multiple types of fibers with different additive particles.

[0019] An example of the composition of a fiber containing additive particles that can be used in the fabric product of this embodiment will be explained with reference to Figure 1. Figure 1 is a schematic cross-sectional view of the fiber 10 containing additive particles, passing through the central axis CA.

[0020] As shown in Figure 1, the fiber 10 containing the added particles can have a chemical fiber resin 11 and the added particles 12.

[0021] The chemical fiber can be selected according to the intended use of the fabric product. For example, the chemical fiber may be one or more fibers selected from the group of resins consisting of polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyamide, acrylic, and modacrylic. In other words, the resin 11 of the fiber used in the fabric product of this embodiment may be one or more fibers selected from the above group of resins.

[0022] As described below, the fabric product of this embodiment may include first fibers and second fibers with different added particles. The resins of the first fibers and the second fibers may be different or the same.

[0023] The added particles 12 vary depending on the fiber and can be either composite tungsten oxide particles, titanium oxide particles, or zinc oxide particles.

[0024] Figure 1 is a schematic diagram in which the added particles 12 are shown as circles or ellipses, but the shape is not limited to these and can have any shape.

[0025] In Figure 1, the additive particles 12 are shown as being entirely embedded within the resin 11, but for example, some of the additive particles 12 may be exposed from the surface 11A of the resin 11. However, from the viewpoint of preventing the additive particles 12 from falling off when repeated washing is performed, it is preferable that the additive particles 12 are entirely embedded within the resin 11. That is, it is preferable that the additive particles 12 are kneaded into the resin 11.

[0026] In Figure 1, fiber 10 is shown as a single, untwisted yarn (untwisted yarn). However, the fibers used in the fabric product of this embodiment may be untwisted yarn, twisted yarn made by twisting multiple yarns together, or spun yarn. In the case of twisted yarn, it is preferable that each yarn contained in the twisted yarn contains the same compound additive particles.

[0027] The following describes each fiber. (1-1) First fiber The first fiber may contain composite tungsten oxide particles. (1-1-1) Composite tungsten oxide particles (Composition) Composite tungsten oxide particles may be, for example, of the general formula M ｘ WO ｙIt may contain a composite tungsten oxide represented by . Note that the composite tungsten oxide particles may consist solely of composite tungsten oxide, but this does not exclude the inclusion of unavoidable impurities. In the general formula, the element M(M) is H (hydrogen), He (helium), alkali metal elements, alkaline earth metal elements, rare earth elements, Mg (magnesium), Zr (zirconium), Cr (chromium), Mn (manganese), Fe (iron), Ru (ruthenium), Co (cobalt), Rh (rhodium), Ir (iridium), Ni (nickel), Pd (palladium), Pt (platinum), Cu (copper), Ag (silver), Au (gold), Zn (zinc), Cd (cadmium), Al (aluminum), Ga (gallium), In (indium), It can be one or more elements selected from Tl (thallium), Si (silicon), Ge (germanium), Sn (tin), Pb (lead), Sb (antimony), B (boron), F (fluorine), P (phosphorus), S (sulfur), Se (selenium), Br (bromine), Te (tellurium), Ti (titanium), Nb (niobium), V (vanadium), Mo (molybdenum), Ta (tantalum), Re (rhenium), Be (beryllium), Hf (hafnium), Os (osmium), Bi (bismuth), and I (iodine). Also, W represents tungsten, O represents oxygen, and x may be 0.001 ≤ x ≤ 1.2. y may satisfy 2.0 ≤ y ≤ 3.0.

[0028] In this specification, examples of alkali metal elements include Li (lithium), Na (sodium), K (potassium), Rb (rubidium), Cs (cesium), and Fr (francium).

[0029] Furthermore, examples of alkaline earth metal elements include Ca (calcium), Sr (strontium), Ba (barium), and Ra (radium).

[0030] Rare earth elements include Sc (scandium), Y (yttrium), La (lanthanum), Ce (cerium), Pr (praseodymium), Nd (neodymium), Pm (promethium), Sm (samarium), Eu (europium), Gd (gadolinium), Tb (terbium), Dy (dysprosium), Ho (holmium), Er (erbium), Tm (thulium), Yb (ytterbium), and Lu (lutetium).

[0031] Tungsten oxide itself, which does not contain element M, can also be used as a near-infrared absorbing material because the absence of oxygen from tungsten trioxide generates a sufficient amount of free electrons to enhance its absorption properties in the near-infrared region.

[0032] When element M is added to tungsten oxide to form a composite tungsten oxide, free electrons are generated in the composite tungsten oxide, resulting in stronger absorption characteristics in the near-infrared region due to these free electrons. Therefore, it is effective and preferable as a near-infrared absorbing material that absorbs near-infrared light around a wavelength of 1000 nm.

[0033] As previously described, elements that can be suitably used as element M are as follows. Particularly from the viewpoint of stability in composite tungsten oxide particles to which element M is added, it is more preferable that element M is one or more elements selected from H, alkali metal elements, alkaline earth metal elements, rare earth elements, 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, Hf, Os, Bi, and I.

[0034] From the viewpoint of improving the optical properties and weather resistance of composite tungsten oxide particles, it is even more preferable that the element M is one or more selected from H, alkali metals, alkaline earth metals, and transition metals (rare earth elements, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Ti, Nb, V, Mo, Ta, Re, Hf, Os). In particular, it is preferable that the element M is one or more selected from H, alkali metals, alkaline earth metals, and rare earth elements.

[0035] For composite tungsten oxide particles, more efficient near-infrared absorbing particles can be produced by combining control of the oxygen content of the tungsten oxide with the addition of element M, which generates free electrons. When oxygen content control and the addition of element M, which generates free electrons, are combined, the general formula M representing composite tungsten oxide is obtained. ｘ WO ｙ In this case, it is preferable that the relationships 0.001 ≤ x ≤ 1.2 and 2.0 ≤ y ≤ 3.0 are satisfied.

[0036] When the value of x is 0.001 or greater, a sufficient amount of free electrons is generated, and the desired near-infrared absorption effect can be obtained. Furthermore, the supply of free electrons increases with increasing amount of element M added, and the near-infrared absorption efficiency also increases, but this effect saturates when the value of x is around 1.2. Moreover, it is preferable when the value of x is 1.2 or less, as this avoids the generation of impurity phases in the composite tungsten oxide particles.

[0037] Next, the value of y indicating control of the oxygen content will be described. Regarding the value of y, in the composite tungsten oxide, in addition to the same mechanism working as in tungsten oxide, even when y=3.0, free electrons are supplied depending on the addition amount of the element M described above. For this reason, 2.0≦y≦3.0 may be satisfied. (Crystal Structure) The crystal structure of the composite tungsten oxide contained in the composite tungsten oxide particles is not particularly limited, and composite tungsten oxides having any crystal structure can be contained. However, when the composite tungsten oxide contained in the composite tungsten oxide particles has a hexagonal crystal structure, the light transmittance in the visible light region and the light absorption in the near infrared region of the particles are particularly improved. Therefore, the composite tungsten oxide may have a hexagonal crystal structure. (Average Particle Size) The average particle size of the composite tungsten oxide particles can be selected according to the properties required for textile products. The composite tungsten oxide particles may have an average particle size of, for example, 800 nm or less. This is because particles having an average particle size of 800 nm or less do not completely block light due to scattering, can maintain high visibility in the visible light region, and at the same time can efficiently maintain transparency. Particularly when transparency in the visible light region is emphasized, it is preferable to further consider light scattering in the visible light region caused by the particles.

[0038] When it is required to reduce light scattering in the visible light region caused by the composite tungsten oxide particles, the average particle size is more preferably 200 nm or less, and further preferably 100 nm or less.

[0039] This is because if the average particle size is small, light scattering can be reduced, and unintended gloss in the visible light region and unintended color tone generation caused by wavelength-dependent light scattering (Rayleigh scattering) can be prevented.

[0040] If coarse particles are present in the step of kneading the composite tungsten oxide particles into fibers for producing the first fibers, there is a risk that the yarn may break during spinning. From this viewpoint, it is also preferable to reduce the average particle size of the composite tungsten oxide particles.

[0041] Accordingly, the average particle diameter of the composite tungsten oxide particles is preferably 800 nm or less, more preferably 200 nm or less, and still more preferably 100 nm or less. Although the lower limit of the average particle diameter of the composite tungsten oxide particles is not particularly limited, it is, for example, preferably 1 nm or more, more preferably 5 nm or more, and still more preferably 10 nm or more.

[0042] For the above reasons, the average particle diameter of the composite tungsten oxide particles is preferably from 1 nm to 800 nm, more preferably from 5 nm to 200 nm, still more preferably from 10 nm to 200 nm, and particularly preferably from 10 nm to 100 nm.

[0043] The average particle diameter of the composite tungsten oxide particles is calculated by measuring the particle diameter of each composite tungsten oxide particle from a transmission electron microscope image. Specifically, three fields of view are selected at a magnification that includes 200 or more composite tungsten oxide particles in one field of view, images of the composite tungsten oxide particles in each field of view are binarized, and the average particle diameter is calculated by image analysis.

[0044] The upper limit of the number of composite tungsten oxide particles in one field of view is not particularly limited, and for example, the magnification may be selected such that one field of view contains 500 or less composite tungsten oxide particles. Further, all composite tungsten oxide particles in the three fields of view may be used as evaluation objects; for example, a total of 500 to 800 particles inclusive may be selected from the three fields of view, or 600 to 700 particles inclusive may be selected.

[0045] Then, the circular equivalent diameter is calculated from the area of ​​each composite tungsten oxide particle and this is taken as the particle size of the composite tungsten oxide particle. Next, the average particle size can be calculated by adding up the particle sizes of all the evaluated composite tungsten oxide particles and dividing by the number of particles evaluated. In other words, the arithmetic mean of the particle sizes of the evaluated composite tungsten oxide particles can be taken as the average particle size. (1-1-2) Regarding the content of composite tungsten oxide particles The content of composite tungsten oxide particles in the first fiber is not particularly limited, but may be, for example, 0.02% by mass or more, 0.03% by mass or more, or 0.05% by mass or more.

[0046] By increasing the content of composite tungsten oxide particles in the first fiber to 0.02% by mass or more, the near-infrared absorption capacity of the first fiber can be enhanced, thereby improving the near-infrared shielding performance of the fabric product of this embodiment.

[0047] The content of composite tungsten oxide particles in the first fiber may be 0.30% by mass or less, 0.20% by mass or less, or 0.15% by mass or less.

[0048] By reducing the content of composite tungsten oxide particles in the first fiber to 0.30% by mass or less, the temperature rise of the fabric product of this embodiment, caused by heat generated mainly by the absorption of near-infrared rays by the composite tungsten oxide particles, can be reduced. Therefore, even when the fabric product of this embodiment is used in clothing, the comfort of the wearer can be enhanced.

[0049] Therefore, the first fiber may contain composite tungsten oxide particles in a proportion of 0.02% by mass or more and 0.30% by mass or less, or in a proportion of 0.03% by mass or more and 0.20% by mass or less, or in a proportion of 0.05% by mass or more and 0.15% by mass or less. (1-1-3) Regarding spun yarn, the fabric product of this embodiment may contain the first fiber as a spun yarn with natural fibers or regenerated fibers.

[0050] By including it in the spun yarn, the strength of the primary fiber and the fabric product can be increased.

[0051] As natural fibers, one or more fibers selected from cotton, linen, wool, and silk may be used.

[0052] The regenerated fiber may be one or more fibers selected from rayon and cupro. (1-1-4) Regarding the content ratio, the proportion of the first fiber contained in the fabric product of this embodiment may be selected according to the ultraviolet and near-infrared shielding performance required for the fabric product. In the fabric product of this embodiment, for example, if the total mass ratio of the first fiber and the second fiber is 100% by mass, the first fiber may be contained in a proportion of 10% by mass or more and 90% by mass or less, or in a proportion of 20% by mass or more and 60% by mass or less.

[0053] By setting the content of the first fiber to 10% by mass or more, the near-infrared shielding effect of the fabric product can be particularly enhanced.

[0054] Furthermore, by limiting the content of the first fiber to 90% by mass or less, the content of the second fiber can be sufficiently increased, allowing for a good balance between ultraviolet shielding and near-infrared shielding effects. (1-2) Second fiber The second fiber may contain titanium dioxide particles.

[0055] Titanium dioxide can reflect and absorb both UV-A (ultraviolet A rays) with wavelengths between 315 nm and 400 nm, and UV-B (ultraviolet B rays) with wavelengths between 280 nm and 315 nm, thereby blocking ultraviolet rays. Therefore, by combining the first fiber and the second fiber to form a fabric product, it is possible to create a fabric product that can block both ultraviolet and near-infrared rays.

[0056] Furthermore, it is believed that the titanium oxide particles contained in the second fiber reflect a portion of the light in the near-infrared region. Therefore, although the composite tungsten oxide particles contained in the first fiber generate heat when they absorb near-infrared light, it is thought that by combining them with the second fiber, the amount of near-infrared light absorbed can be reduced, thereby reducing the amount of heat generated.

[0057] It is also conceivable to arrange composite tungsten oxide particles and titanium oxide particles within the same fiber, but there is a risk that the composite tungsten oxide particles, placed in close proximity, will absorb the near-infrared rays reflected by the titanium oxide particles, increasing the amount of heat generated and reducing the heat shielding performance.

[0058] Therefore, by using a second fiber in addition to the first fiber, and combining the two to create a fabric product, the temperature rise when exposed to sunlight can be reduced and the heat shielding performance can be improved. (1-2-1) About titanium oxide particles (Composition) Titanium oxide particles are, for example, of the general formula TiO ２ It can contain titanium dioxide represented by [formula]. Note that in titanium dioxide, oxygen may be deficient or in excess of the stoichiometric ratio. Titanium dioxide particles may consist only of titanium dioxide, but even in this case, the presence of unavoidable impurities is not excluded. (Crystal structure) The crystal structure of titanium dioxide contained in titanium dioxide particles is not particularly limited and may have any of the following crystal structures: anatase type, rutile type, or brookite type. Titanium dioxide may also be amorphous. (Average particle size) The average particle size of titanium dioxide particles can be selected according to the properties required for the fabric product. Titanium dioxide particles may have an average particle size of, for example, 800 nm or less. By setting the average particle size to 800 nm or less, high visibility in the visible light region can be maintained while simultaneously efficiently maintaining transparency.

[0059] From the viewpoint of reducing the scattering of light in the visible light region by titanium dioxide particles and preventing the occurrence of unintended gloss and unintended color tones in the visible light region, the average particle size is more preferably 200 nm or less, and even more preferably 100 nm or less.

[0060] If coarse particles are present in the process of kneading titanium dioxide particles into the fibers to produce the second fiber, there is a risk that the yarn may break during spinning. From this perspective, it is preferable to reduce the average particle size of the titanium dioxide particles.

[0061] Therefore, the average particle size of the titanium dioxide particles is preferably 800 nm or less, more preferably 200 nm or less, and even more preferably 100 nm or less. The lower limit of the average particle size of the titanium dioxide particles is not particularly limited, but it is preferably 1 nm or more, more preferably 5 nm or more, and even more preferably 10 nm or more.

[0062] For the reasons stated above, the average particle size of the titanium dioxide particles is preferably 1 nm to 800 nm, more preferably 5 nm to 200 nm, even more preferably 10 nm to 200 nm, and particularly preferably 10 nm to 100 nm.

[0063] The average particle size of titanium oxide particles can be measured using the same procedure and conditions as for composite tungsten oxide particles, except that titanium oxide particles are used as the measurement target, so the explanation is omitted. (1-2-2) Regarding the content of titanium oxide particles, the content of titanium oxide particles in the second fiber is not particularly limited, but the second fiber may contain titanium oxide in a proportion of, for example, 1% by mass or more, or 1.5% by mass or more.

[0064] By increasing the titanium dioxide particle content in the second fiber to 1% by mass or more, the ultraviolet shielding ability of the second fiber can be enhanced, thereby improving the ultraviolet shielding performance of the fabric product of this embodiment.

[0065] The titanium dioxide particle content in the second fiber may be 10% by mass or less, or 5% by mass or less.

[0066] By reducing the titanium dioxide particle content in the second fiber to 10% by mass or less, the second fiber can be easily colored with dyes, thereby expanding the applications of the fabric product of this embodiment.

[0067] Therefore, the second fiber may contain titanium oxide particles in a proportion of 1% by mass or more and 10% by mass or less, or in a proportion of 1.5% by mass or more and 5% by mass or less. (1-3) Third fiber The fabric product of this embodiment may further contain a third fiber. The third fiber may contain zinc oxide particles.

[0068] Titanium dioxide is particularly excellent at shielding UV-B rays among ultraviolet rays. In contrast, zinc oxide is excellent at shielding UV-A rays. For this reason, the fabric product of this embodiment can be made to particularly enhance the light shielding performance in the ultraviolet region by including a third fiber containing zinc oxide particles in addition to the first and second fibers. (1-3-1) About zinc oxide particles (Composition) Zinc oxide particles may contain zinc oxide represented by the general formula ZnO, for example. In zinc oxide, oxygen may be deficient or in excess of the stoichiometric ratio. Zinc oxide particles may consist only of zinc oxide, but even in this case, the inclusion of unavoidable impurities is not excluded. (Crystal structure) The crystal structure of zinc oxide contained in zinc oxide particles is not particularly limited and may have a wurtzite-type crystal structure. Also, zinc oxide may be amorphous. (Average particle size) The average particle size of zinc oxide particles can be selected according to the properties required for the fabric product. Zinc oxide particles may have an average particle size of 800 nm or less, for example. By keeping the average particle size below 800 nm, high visibility in the visible light range can be maintained while simultaneously efficiently preserving transparency.

[0069] From the viewpoint of reducing the scattering of light in the visible light region by zinc oxide particles and preventing the occurrence of unintended gloss and unintended color tones in the visible light region, the average particle size is more preferably 200 nm or less, and even more preferably 100 nm or less.

[0070] If coarse particles are present in the process of kneading zinc oxide particles into fibers to produce the third fiber, there is a risk that the yarn may break during spinning. From this perspective, it is preferable to reduce the average particle size of zinc oxide particles.

[0071] Therefore, the average particle size of zinc oxide particles is preferably 800 nm or less, more preferably 200 nm or less, and even more preferably 100 nm or less. The lower limit of the average particle size of zinc oxide particles is not particularly limited, but is preferably 1 nm or more, more preferably 5 nm or more, and even more preferably 10 nm or more.

[0072] For the reasons stated above, the average particle size of the zinc oxide particles is preferably 1 nm to 800 nm, more preferably 5 nm to 200 nm, even more preferably 10 nm to 200 nm, and particularly preferably 10 nm to 100 nm.

[0073] The average particle size of zinc oxide particles can be measured using the same procedure and conditions as for composite tungsten oxide particles, except that zinc oxide particles are used as the measurement target, so the explanation is omitted. (1-3-2) Regarding the zinc particle content, the zinc particle content in the third fiber is not particularly limited, but may be, for example, 0.1% by mass or more, or 1% by mass or more.

[0074] By increasing the zinc oxide particle content in the third fiber to 0.1% by mass or more, the ultraviolet shielding ability of the third fiber can be enhanced, thereby improving the ultraviolet shielding performance of the fabric product of this embodiment.

[0075] The zinc oxide particle content in the third fiber may be 5% by mass or less, or 3% by mass or less.

[0076] By reducing the zinc oxide particle content in the third fiber to 5% by mass or less, the third fiber can be easily colored with dyes, thereby expanding the applications of the fabric product of this embodiment.

[0077] Therefore, the third fiber may contain zinc oxide particles in a proportion of 0.1% to 5% by mass, or in a proportion of 1% to 3% by mass. (1-3-3) Proportion of third fiber The proportion of third fiber contained in the fabric product of this embodiment may be selected according to the ultraviolet and near-infrared shielding performance required of the fabric product. For example, the fabric product of this embodiment may contain the third fiber in a proportion of 40% by mass or less when the total mass ratio of the first fiber and the second fiber is 100% by mass. That is, the fabric product may contain the third fiber in a proportion of 0% to 40% by mass when the total mass ratio of the first fiber and the second fiber is 100% by mass.

[0078] By limiting the content of the third fiber to 40% by mass or less, the proportion of the first and second fibers in the fabric product can be sufficiently increased, allowing for a good balance between ultraviolet shielding and near-infrared shielding effects. (2) Characteristics of the fabric product (2-1) Form of the fabric product The fabric product of this embodiment only needs to contain the first fiber and the second fiber, and its specific form is not particularly limited, but it may be a woven fabric, a knitted fabric, or a nonwoven fabric, for example.

[0079] Furthermore, a woven fabric refers to a material made by weaving together warp threads and weft threads. By using first fibers, second fibers, and possibly even third fibers in the warp and weft threads, it is possible to create a fabric product containing each of these fibers. When the fabric product of this embodiment is a woven fabric, its structure (weaving method) can be selected according to the desired weight and thickness.

[0080] Furthermore, knitted fabric refers to a material manufactured by intertwining yarn in a loop-like structure.

[0081] The fabric product of this embodiment may have a planar shape, and if the main surfaces are designated as a first surface and a second surface, the first surface and the second surface may be woven in such a way that the proportion of first fibers exposed on the surface per unit area of ​​the main surface is different.

[0082] The three basic weave structures are plain weave, twill weave, and satin weave. In plain weave, the weft threads are interwoven alternately, so the area ratio of warp and weft threads exposed on the surface is almost the same on the first and second surfaces.

[0083] In twill weave, the warp threads pass over two or three weft threads, then under one weft thread, and this process is repeated, resulting in diagonal intersection points of the threads. Satin weave further reduces the number of intersection points between the warp and weft threads. As a result, in twill and satin weaves, the area ratio of warp and weft threads exposed on the surface differs between the first and second surfaces.

[0084] In particular, the fabric product of this embodiment may be a woven fabric using a twill weave.

[0085] In the case of twill weave, the exposed areas of warp and weft are different between the front surface and the back surface. Therefore, by selecting the surface to be used according to the application, the shielding properties suited for the purpose can be exhibited. For example, regarding the fabric product manufactured in Experimental Example 1 described later, it may be arranged and used such that sunlight is irradiated onto the surface having a large exposure ratio of the second fiber, which is polyester fiber B, per unit area of the main surface.

[0086] In the fabric product of the present embodiment, the content ratio of the additive-containing fiber is not particularly limited, and may be, for example, 60% by mass or more, 70% by mass or more, 80% by mass or more, or 90% by mass or more. The fabric product of the present embodiment may be formed only of additive-containing fibers.

[0087] The additive-containing fiber refers to the first fiber, the second fiber, and the third fiber. In addition to the additive-containing fiber, the fabric product of the present embodiment may contain a fiber that has an extremely low content of or does not contain any additive that cannot be classified into any of the first fiber, the second fiber, or the third fiber. (2-2) Basis Weight and Thickness Basis weight refers to the weight per unit area of a fabric product.

[0088] The basis weight of the fabric product of the present embodiment is 50 g / m ２ or more and 330 g / m ２ or less.

[0089] By setting the basis weight to 50 g / m ２ or more, the shielding performance against ultraviolet rays and near-infrared rays can be improved.

[0090] By setting the basis weight to 330 g / m ２ or less, the temperature rise when the fabric product is irradiated with sunlight can be reduced, and the heat shielding performance can be improved.

[0091] The thickness of the fabric product of the present embodiment may be 0.2 mm or more and 1.3 mm or less.

[0092] By setting the thickness to 0.2 mm or more, the shielding performance against ultraviolet rays and near-infrared rays can be improved.

[0093] By making the thickness 1.3 mm or less, the temperature rise when sunlight is shone on the fabric product can be reduced, and the heat shielding performance can be improved. (2-3) Ultraviolet shielding rate, near-infrared shielding rate For the fabric product of this embodiment, the ultraviolet shielding rate when sunlight is shone on it may be 80% or more, or 90% or more.

[0094] By achieving a UV shielding rate of 80% or more when exposed to sunlight, the transmission of ultraviolet rays can be sufficiently reduced, thereby improving heat shielding performance.

[0095] In the fabric product of this embodiment, the near-infrared shielding rate when irradiated with sunlight may be 60% or more, or 70% or more.

[0096] By achieving a near-infrared shielding rate of 60% or more when irradiated with sunlight, the transmission of near-infrared rays can be sufficiently reduced, thereby improving heat shielding performance. (3) Applications of fabric products The fabric products of this embodiment can be used in various applications where ultraviolet shielding performance and near-infrared shielding performance are required.

[0097] The fabric product of this embodiment may be used, for example, in outdoor equipment such as tents, tarps, and parasols that require protection from sunlight, sunshades, everyday items such as parasols, car interior parts, building heat shielding materials, protective covers for electronic equipment, medical gowns, surgical tents, wheelchair covers, greenhouses, heat shielding sheets, and the like.

[0098] The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto. (1) Evaluation method (1-1) Ultraviolet shielding rate, near-infrared shielding rate The ultraviolet shielding rate was measured and calculated in accordance with JIS L 1925 (2019). Spectral transmittance was measured at 1 nm wavelength intervals, and all measured values ​​were used to calculate the ultraviolet shielding rate.

[0099] For the evaluation of UV protection rate, a UV protection rate of 98% or higher was rated as ◎, 90% to less than 98% as ○, 80% to less than 90% as △, and less than 80% as ×. A UV protection rate of ◎ indicates the best UV protection performance, followed by ○, △, and then ×. A UV protection rate of ◎, ○, or △ means that the fabric product can adequately block ultraviolet rays.

[0100] The near-infrared shielding rate was measured and calculated in accordance with JIS L 1925 (2019), except that the wavelength range was set to 800 nm to 2500 nm. Spectral transmittance was measured at 1 nm wavelength intervals, and all measured values ​​were used in the calculation of the near-infrared shielding rate.

[0101] Regarding the evaluation of near-infrared shielding rate, a near-infrared shielding rate of 80% or more was evaluated as ◎, 70% or more and less than 80% as ○, 60% or more and less than 70% as △, and less than 60% as ×. When the near-infrared shielding rate evaluation is ◎, the near-infrared shielding performance is the best, and it decreases in the order of ○, △, and ×. If the near-infrared shielding rate is ◎, ○, or △, it means that the fabric product can sufficiently shield near-infrared rays. (1-2) Weight The weight per unit area in the standard state of weight was measured according to Method A (JIS method) of JIS L 1096 (2020). (2) Experimental examples (2-1) Experimental example 1 Using the fibers shown in Table 1, a woven fabric product was manufactured and evaluated so that each fiber was included in the mass ratio shown in Table 2 and the weight was as shown in Table 2. The content ratio of each polyester fiber contained in the woven fabric was selected by selecting the ratio of the number of fibers that make up the woven fabric.

[0102] The cesium tungsten oxide particles contained in polyester fiber A in Table 1 have the general formula Cs ｘ WO ｙ It is expressed as follows, and satisfies the relationships 0.001 ≤ x ≤ 1.2 and 2.0 ≤ y ≤ 3.0.

[0103] Polyester fiber D contains titanium dioxide particles in an extremely small amount (less than 0.3% by mass) to reduce gloss.

[0104] Furthermore, polyester fibers A to D all use polyethylene terephthalate as the polyester. [Examples 1-1, 1-2] In Example 1-1, a fabric product was manufactured and evaluated, which was a woven fabric containing the first fiber and the second fiber in the proportions shown in Table 2. In this example, as well as in Examples 1-2 and Comparative Example 1-1, the twill-woven fabric products were evaluated by irradiating the surface with a high exposure ratio of the second fiber, polyester fiber B, per unit area of ​​the main surface with light from a light source.

[0105] In Examples 1-2, a fabric product was manufactured and evaluated using a twill weave containing the first fiber, second fiber, and third fiber in the proportions shown in Table 2.

[0106] The evaluation results are shown in Table 2. [Comparative Example 1-1] In Comparative Example 1-1, a fabric product was manufactured and evaluated, which was a woven fabric containing polyester fiber B, the second fiber, and polyester fiber D, in the proportions shown in Table 2.

[0107] The evaluation results are shown in Table 2.

[0108] As shown in Table 2, the fabric products of Examples 1-1 and 1-2, which include the first and second fibers, were found to have superior ultraviolet shielding rates and near-infrared shielding rates compared to Comparative Example 1-1, which has the same basis weight and structure.

[0109] Furthermore, when comparing Example 1-1, which has a different fabric structure, with Example 2-1, which will be described later, it was confirmed that the fabric product of Example 1-1, which is a twill weave, was superior in both ultraviolet shielding rate and near-infrared shielding rate. (2-2) Experimental Example 2 Using the fibers shown in Table 1, a fabric product was manufactured and evaluated containing each fiber in the mass ratio shown in Table 3 and with the basis weight shown in Table 3. The content ratio of each polyester fiber contained in the fabric was selected by selecting the ratio of the number of fibers forming the fabric. [Example 2-1] In Example 2-1, a fabric product was manufactured and evaluated using a plain weave containing the first fiber and the second fiber in the ratios shown in Table 3. In the case of a plain weave, the ratio of the first fiber and the second fiber exposed on the surface per unit area of ​​the main surface is almost the same regardless of the surface, so the ultraviolet shielding rate and near-infrared shielding rate were evaluated by irradiating any surface with light from a light source.

[0110] The evaluation results are shown in Table 2. [Comparative Example 2-1] In Comparative Example 2-1, a fabric product was manufactured and evaluated, which was a plain weave fabric containing polyester fibers in the proportions shown in Table 3.

[0111] As shown in Table 3, the fabric product of Example 2-1, which includes the first and second fibers, was found to have superior ultraviolet shielding rate and near-infrared shielding rate compared to Comparative Example 2-1, which has the same basis weight and structure. (2-3) Experimental Example 3 [Example 3-1] Using the fabric product made in Example 1-1, a tarp 21 with a ceiling height H1 from the ground surface 22 of 270 cm was made, as shown in Figure 2. In Figure 2, the description of the jig for supporting the tarp is omitted.

[0112] Then, black paper 231 was placed inside the tarp 21 at a height H2 of 70 cm from the ground surface 22, and the temperature on the surface of the black paper 231 was measured every hour to conduct a heat shielding effect test. The evaluation started at 9:00 a.m. In addition, when making the tarp 21, the fabric product was positioned so that sunlight hit the side with the highest exposure ratio of the second fiber, polyester fiber B, per unit area of ​​the main surface.

[0113] The evaluation results are shown in Table 4 and Figure 3.

[0114] In this case, black paper 232 was placed outside the tarp 21 at a height H2 of 70 cm from the ground surface 22, and the temperature on the surface of the black paper 232 was measured every hour. The evaluation results are shown in the "Black paper temperature outside the tarp" column of Table 3. [Comparative Example 3-1] The heat shielding effect test was conducted under the same conditions as in Example 3-1, except that a commercially available tarp with a water pressure resistance of 1,800 mm, made of 210D polyester oxford fabric with a polyurethane coating on the back, was used as the tarp 21. The evaluation results are shown in Table 4 and Figure 3. [Comparative Example 3-2] In Comparative Example 3-2, the heat shielding effect test was conducted under the same conditions as in Example 3-1, except that a black polyurethane film was further laminated to the back of the tarp fabric used in Comparative Example 3-1. The evaluation results are shown in Table 4 and Figure 3. [Comparative Example 3-3]

[0115] In Comparative Example 3-3, the heat shielding effect test was conducted under the same conditions as in Example 3-1, except that a silver vapor-deposited film was formed on the back of the tarp fabric used in Comparative Example 3-1. The evaluation results are shown in Table 4 and Figure 3.

[0116]

[0117] As shown in Table 4 and Figure 3, in Example 3-1, which uses a fabric product according to one embodiment of the present disclosure, it was confirmed that the temperature rise was reduced compared to Comparative Examples 3-1, 3-2, and 3-3. [Note] Embodiments of the present disclosure are, for example, as follows.

[0118] (1) A fabric product containing chemical fibers, wherein the chemical fibers include a first fiber containing composite tungsten oxide particles and a second fiber containing titanium oxide particles in a proportion of 1% by mass or more.

[0119] (2) The fabric product according to (1), wherein the chemical fiber is one or more fibers selected from polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyamide, acrylic, and modacrylic.

[0120] (3) The fabric product according to (1) or (2), wherein the first fiber is included as a spun yarn with natural fibers or regenerated fibers.

[0121] (4) The fabric product described in (3), wherein the natural fiber is one or more fibers selected from cotton, linen, wool, and silk.

[0122] (5) The fabric product according to (3) or (4), wherein the regenerated fiber is one or more fibers selected from rayon and cupro.

[0123] (6) The fabric product according to any one of (1) to (5), wherein the first fiber contains the composite tungsten oxide particles in a proportion of 0.02% by mass or more and 0.30% by mass or less.

[0124] (7) The fabric product according to any one of (1) to (6), wherein the average particle size of the composite tungsten oxide particles is 10 nm or more and 200 nm or less.

[0125] (8) The composite tungsten oxide particles have a general formula M ｘ WO ｙ A fabric product according to any one of (1) to (7), comprising a composite tungsten oxide represented by (element M(M) being one or more elements selected from H, alkali metal elements, alkaline earth metal elements, and rare earth elements, satisfying 0.001 ≤ x ≤ 1.2 and 2.0 ≤ y ≤ 3.0).

[0126] (9) A fabric product according to any one of (1) to (8), wherein the first fiber is contained in a proportion of 10% by mass or more and 90% by mass or less, when the total mass ratio of the first fiber and the second fiber is 100% by mass.

[0127] (10) The fabric product according to any one of (1) to (9), further comprising a third fiber containing zinc oxide particles.

[0128] (11) The fabric product according to (10), wherein the third fiber is contained in a proportion of 40% by mass or less when the total mass proportion of the first fiber and the second fiber is 100% by mass.

[0129] (12) A textile product described in any of (1) to (11), which is a woven fabric in a twill weave.

[0130] (13) A fabric product as described in any of (1) to (12), having an ultraviolet shielding rate of 80% or more and a near-infrared shielding rate of 60% or more when exposed to sunlight.

[0131] This application claims priority based on Japanese Patent Application No. 2025-057252, filed with the Japan Patent Office on 28 March 2025, and the entire contents of Japanese Patent Application No. 2025-057252 are incorporated herein by reference.

[0132] 10 Fiber containing added particles 11 Resin 11A Surface 12 Added particles CA Central axis 21 Tarp 22 Ground surface 231 Black paper 232 Black paper H1 Height H2 Height

Claims

1. A fabric product containing chemical fibers, wherein the chemical fibers include a first fiber containing composite tungsten oxide particles and a second fiber containing titanium oxide particles in a proportion of 1% by mass or more.

2. The fabric product according to claim 1, wherein the chemical fiber is one or more fibers selected from polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyamide, acrylic, and modacrylic.

3. The fabric product according to claim 1 or claim 2, wherein the first fiber is included as a spun yarn with natural fibers or regenerated fibers.

4. The fabric product according to claim 3, wherein the natural fiber is one or more fibers selected from cotton, linen, wool, and silk.

5. The fabric product according to claim 3, wherein the regenerated fiber is one or more fibers selected from rayon and cupro.

6. The fabric product according to claim 1 or claim 2, wherein the first fiber contains the composite tungsten oxide particles in a proportion of 0.02% by mass or more and 0.30% by mass or less.

7. The fabric product according to claim 1 or claim 2, wherein the average particle size of the composite tungsten oxide particles is 10 nm or more and 200 nm or less.

8. The composite tungsten oxide particles have the general formula M ｘ WO ｙ A fabric product according to claim 1 or claim 2, comprising a composite tungsten oxide represented by (element M(M) is one or more elements selected from H, alkali metal elements, alkaline earth metal elements, and rare earth elements, satisfying 0.001 ≤ x ≤ 1.2 and 2.0 ≤ y ≤ 3.0).

9. The fabric product according to claim 1 or claim 2, wherein the first fiber is contained in a proportion of 10% by mass or more and 90% by mass or less, when the total mass ratio of the first fiber and the second fiber is 100% by mass.

10. The fabric product according to claim 1 or claim 2, further comprising a third fiber containing zinc oxide particles.

11. The fabric product according to claim 10, wherein the third fiber is contained in a proportion of 40% by mass or less, when the total mass proportion of the first fiber and the second fiber is 100% by mass.

12. The fabric product according to claim 1 or claim 2, which is a woven fabric made in a twill weave.

13. The fabric product according to claim 1 or claim 2, wherein the ultraviolet shielding rate when irradiated with sunlight is 80% or more and the near-infrared shielding rate is 60% or more.

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