Infrared shielding fiber structure and garment using same

Abstract

The present invention addresses the problem of providing: an infrared-shielding fiber structure in which the function of using infrared candid photography is prevented from deteriorating over time and in which a knitted fabric is prevented from discoloring over time; and a garment using the infrared-shielding fiber structure. This infrared-shielding fiber structure is obtained by reacting particles of a tungsten oxide represented by the general formula WOX (W is tungsten, O is oxygen, and 2.45 < = X < = 2.999) and particles of a tungsten oxide represented by the general formula MYWOZ (element M is an element selected from Cs, Rb, K, Tl, In, and the like, 0.001 < = Y < = 1.0, 0.001 < = Y < = 1.0, and 0 < = Y < = 1.0) with particles of a tungsten oxide represented by the general formula MYWOZ (element M is an element selected from the group consisting of Cs, Rb, K, Tl, In, and the like). 2.2 < = Z < = 3.0), characterized in that the particle diameter of the particles is 1-800 nm (inclusive), the content of the particles per unit area of the structure is 0.10-4.5 g / m < 2 > (inclusive), and the particle diameter of the particles is 1-800 nm (inclusive). The structure has an average reflectance of 65% or less at a wavelength of 800-1300 nm, and thus can maintain a function of preventing the use of infrared candid photography over a long period of time.

Description

Technical Field

[0001] The present invention relates to infrared shielding fiber structures such as textiles, woven fabrics, and non-woven fabrics, which are made by processing infrared shielding fibers whose surface and / or interior contain infrared shielding particles selected from tungsten oxide particles and composite tungsten oxide particles, and clothing such as underwear and sportswear using the infrared shielding fiber structures, and in particular, to improvements in infrared shielding fiber structures and clothing that can prevent surreptitious photography using infrared rays. Background Art

[0002] When a human body is photographed using a CCD camera or the like with natural light as a light source, infrared rays contained in the natural light are used to photograph the human body while being transmitted through clothing. Therefore, criminal acts that take advantage of the above phenomenon (so-called candid photography) have become a social problem in recent years. In order to solve this problem, clothes (infrared shielding fiber structures) have been developed by manufacturing infrared shielding fibers that absorb or reflect infrared rays and processing the infrared shielding fibers.

[0003] For example, Patent Document 1 discloses a knitted fabric made by attaching a dye selected from anthraquinone, indigo, benzoquinone, naphthoquinone, and phthalocyanine to a core-sheath type synthetic fiber to form an infrared shielding fiber, and processing the infrared shielding fiber. The above-mentioned dye absorbs infrared rays, and therefore, the knitted fabric disclosed in Patent Document 1 can reliably prevent surreptitious photography using infrared rays. However, dyes such as anthraquinone and indigo are organic materials, and therefore have difficulty in weather resistance, and further have the disadvantage of discoloring over time. Therefore, in the knitted fabric disclosed in Patent Document 1, there is a problem that the function of preventing surreptitious photography using infrared rays decreases over time, and further, there is a fatal problem that the knitted fabric discolors over time.

[0004] On the other hand, Patent Documents 2 and 3 disclose infrared shielding fibers using inorganic infrared shielding particles and fiber products that can be used for cold-proof clothing, etc., which are different from the purpose described in Patent Document 1 (providing a knitted fabric that can prevent voyeurism using infrared rays). That is, Patent Document 2 discloses a fiber product that is made by processing an inorganic material (tungsten oxide particles or composite tungsten oxide particles) that absorbs infrared rays from sunlight, etc., to form a near-infrared absorbing fiber (infrared shielding fiber), and Patent Document 3 discloses an infrared absorbing fiber (infrared shielding fiber) and a fiber product that improves the chemical resistance of infrared shielding particles by coating the surface of tungsten oxide particles or composite tungsten oxide particles (infrared shielding particles) with polyester resin, polycarbonate resin, etc.

[0005] Therefore, a method of using the infrared shielding fibers of Patent Documents 2 to 3 containing inorganic materials (tungsten oxide particles or composite tungsten oxide particles) on the surface and / or inside to solve the problem of the knitted fabric of Patent Document 1 (i.e., the problem that the function of preventing voyeurism using infrared rays deteriorates over time and the knitted fabric discolors over time) was studied.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2008-223171.

[0009] Patent document 2: International Publication No. 2006 / 049025.

[0010] Patent document 3: Japanese Patent Application Publication No. 2021-075825. Summary of the invention

[0011] Problems to be solved by the invention

[0012] However, the purpose of use of the knitted fabric of Patent Document 1 (knitted fabric that can prevent voyeurism using infrared rays) is significantly different from the purpose of use of the fiber products of Patent Documents 2 to 3 (fiber products that can improve thermal insulation effects and are used for cold-proof clothing, etc.). Therefore, even if the fiber products of Patent Documents 2 to 3 are directly transferred to the knitted fabric of Patent Document 1, the above-mentioned problems of Patent Document 1 (the function of preventing voyeurism using infrared rays decreases over time, and the knitted fabric changes color over time) cannot be solved.

[0013] The present invention is completed with a focus on such problems, and its subject is to provide an infrared shielding fiber structure whose function of preventing voyeurism using infrared rays will not decrease over time and which can also prevent knitted fabrics from discoloring over time, and clothing using the infrared shielding fiber structure.

[0014] Means for solving problems

[0015] Therefore, in order to solve the above-mentioned problems, the present inventors conducted the following technical analysis.

[0016] First, when a human body is photographed using a CCD camera or the like with natural light as a light source, a technical analysis was conducted on the reflectivity of textiles, woven fabrics, etc. that can prevent the above-mentioned surreptitious photography using infrared rays included in natural light.

[0017] As a result, it was found that when the average reflectivity in the infrared region (wavelength 800 nm to 1300 nm) is 65% or less, preferably 60% or less, and more preferably 55% or less, secret photography using infrared rays can be prevented.

[0018] Then, the fiber products (infrared shielding fiber structures) of Patent Documents 2 to 3 that use inorganic infrared shielding particles (tungsten oxide particles or composite tungsten oxide particles) were analyzed, and a technical analysis was conducted under the condition that the average reflectivity in the infrared region (wavelength 800nm ​​to 1300nm) was less than 65% without damaging the physical properties of the fiber product (for example, feel, etc.).

[0019] As a result, it was found that the content of infrared shielding fine particles per unit area in the above fiber product (infrared shielding fiber structure) was 0.10 g / m 2 Above and 4.5g / m 2 In the case of 0.5% or less, the average reflectivity at a wavelength of 800 nm to 1300 nm is 65% or less.

[0020] The present invention has been accomplished through the technical analysis and technical findings described above.

[0021] That is, the first invention of the present invention is an infrared shielding fiber structure obtained by processing an infrared shielding fiber containing one or more infrared shielding particles selected from tungsten oxide particles and composite tungsten oxide particles on the surface and / or inside, characterized in that:

[0022] The infrared shielding fine particles have a particle size of 1 nm or more and 800 nm or less.

[0023] The content of infrared shielding fine particles per unit area of ​​the infrared shielding fiber structure is 0.10 g / m 2 Above and 4.5g / m 2 the following.

[0024] The second invention is the infrared shielding fiber structure described in the first invention, characterized in that

[0025] The infrared shielding fiber structure has an average reflectivity of 65% or less at a wavelength of 800nm ​​to 1300nm.

[0026] Furthermore, a third invention of the present invention is the infrared shielding fiber structure described in the first invention, characterized in that:

[0027] The tungsten oxide particles are of the general formula WO X (wherein W is tungsten, O is oxygen, 2.45≤X≤2.999),

[0028] The composite tungsten oxide particles are represented by the general formula M Y WO Z(wherein 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, 0.001≤Y≤1.0, 2.2≤Z≤3.0), and is a composite tungsten oxide particle having a hexagonal crystal structure.

[0029] The fourth invention is the infrared shielding fiber structure according to the third invention, characterized in that

[0030] The M element of the composite tungsten oxide fine particles is one or more elements selected from Cs, Rb, K, Tl, In, Ba, Li, Ca, Sr, Fe, and Sn.

[0031] Then, a fifth invention of the present invention is the infrared shielding fiber structure described in the first invention, characterized in that

[0032] The infrared shielding fiber is a fiber selected from any one of synthetic fibers, semi-synthetic fibers, natural fibers, regenerated fibers, inorganic fibers, and mixed yarns obtained by blending, doubling, or mixing synthetic fibers, semi-synthetic fibers, natural fibers, regenerated fibers, and inorganic fibers.

[0033] The sixth invention is the infrared shielding fiber structure according to the fifth invention, characterized in that:

[0034] The synthetic fiber is any one selected from polyurethane fibers, polyamide fibers, acrylic fibers, polyester fibers, polyolefin fibers, polyvinyl alcohol fibers, polyvinylidene chloride fibers, polyvinyl chloride fibers, and polyetherester fibers.

[0035] The seventh invention is the infrared shielding fiber structure according to the fifth invention, characterized in that

[0036] The semi-synthetic fiber is any one of cellulose fibers, protein fibers, chlorinated rubber, and hydrochloric acid rubber.

[0037] The eighth invention is the infrared shielding fiber structure according to the fifth invention, characterized in that

[0038] The natural fiber is any one of plant fibers, animal fibers and mineral fibers.

[0039] The ninth invention is the infrared shielding fiber structure according to the fifth invention, characterized in that

[0040] The regenerated fiber is any one type of regenerated fiber selected from cellulose fibers, protein fibers, alginate fibers, rubber fibers, chitin fibers, and mannan fibers.

[0041] In addition, a tenth invention of the present invention is a garment, characterized in that:

[0042] The clothing uses the infrared shielding fiber structure according to any one of the first to third aspects of the invention.

[0043] Effects of the Invention

[0044] According to the infrared shielding fiber structure and the clothes using the infrared shielding fiber structure of the present invention,

[0045] Since inorganic infrared shielding particles (tungsten oxide particles or composite tungsten oxide particles) are used, infrared shielding fiber structures such as textiles and woven fabrics can be prevented from discoloring over time, and the content of infrared shielding particles per unit area of ​​the infrared shielding fiber structure is set to 0.10 g / m 2 Above and 4.5g / m 2 The infrared shielding fiber structure and the clothes using the infrared shielding fiber structure have an average reflectivity of 65% or less in the infrared region (wavelength 800nm ​​to 1300nm), so the function of preventing voyeurism using infrared rays can be maintained for a long time.

[0046] Furthermore, compared with other inorganic infrared shielding particles (ITO, ATO and other particles), the tungsten oxide particles or composite tungsten oxide particles used in the present invention have a high infrared absorption capacity per unit weight, and a sufficient infrared absorption effect can be obtained with a smaller content. Therefore, it is also possible to increase the design freedom in clothing without damaging the physical properties of the fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a graph showing the relationship between the wavelength (nm) and the reflectance (%) of the knitted products (fiber structures) of Examples 1 to 7 and Comparative Examples 1 and 2. DETAILED DESCRIPTION

[0048] Hereinafter, embodiments of the present invention will be described in detail.

[0049] First, the infrared ray shielding fiber structure of the present invention is constituted by processing infrared ray shielding fibers containing inorganic infrared ray shielding fine particles (tungsten oxide fine particles or composite tungsten oxide fine particles) on the surface and / or inside, and as such infrared ray shielding fiber structure, textiles, knitted fabrics, non-woven fabrics, etc. can be cited.

[0050] (1) Infrared ray shielding fine particles

[0051] The infrared ray shielding fiber (near-infrared ray shielding fiber) of the present invention is obtained by containing infrared ray shielding fine particles (fine particles having an infrared ray shielding function) on the fiber surface and / or inside.

[0052] Hereinafter, tungsten oxide fine particles and composite tungsten oxide fine particles having an infrared ray shielding function will be described.

[0053] The above-mentioned tungsten oxide fine particles having an infrared ray shielding function are fine particles represented by the general formula WO X (wherein, W is tungsten, O is oxygen, and 2.45 ≤ X ≤ 2.999).

[0054] The above-mentioned composite tungsten oxide fine particles having an infrared ray shielding function are represented by the general formula M Y WO Z (wherein, 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, I, W is tungsten, O is oxygen, 0.001 ≤ Y ≤ 1.0, and 2.2 ≤ Z ≤ 3.0), and are fine particles having a hexagonal crystal structure.

[0055] Moreover, when tungsten oxide fine particles and composite tungsten oxide fine particles are applied to various fibers, they function as infrared ray shielding components.

[0056] As the tungsten oxide fine particles represented by the above general formula WO X (2.45 ≤ X ≤ 2.999), for example, WO 18 O 49 , WO 20 O 58 , WO 4 O 11 etc. can be cited. If the X value is 2.45 or more, it is possible to completely avoid the occurrence of non-target WO 2In addition, when the value of X is 2.999 or less, a sufficient amount of free electrons is generated, thereby becoming an efficient infrared shielding particle.

[0057] Moreover, the range of X is 2.45≤X≤2.95, such as WO X The compounds are contained in what is known as the Magneli phase.

[0058] In addition, as the above general formula M Y WO Z The composite tungsten oxide particles representing and having a hexagonal crystal structure, for example, as a preferred M element, can be composite tungsten oxide particles containing one or more elements selected from Cs, Rb, K, Tl, In, Ba, Li, Ca, Sr, Fe, and Sn.

[0059] The amount of the added M element Y needs to be greater than 0.001 and less than 1.0, preferably around 0.33. This is because the Y value theoretically calculated from the hexagonal crystal structure is 0.33, and an addition amount of about 0.33 can obtain preferred optical properties. As a typical example, Cs 0.33 WO 3 , Rb 0.33 WO 3 , K 0.33 WO 3 , Ba 0.33 WO 3 However, as long as Y and Z are within the above ranges, useful infrared shielding properties can be obtained.

[0060] (2) Particle size of infrared shielding particles

[0061] Regarding the particle size of infrared shielding particles, it is important that no problem occurs during the fiberization process such as spinning and stretching, and the average particle size of infrared shielding particles is preferably below 800nm. If the average particle size of the above-mentioned particles is below 800nm, the blockage of the die mouth (nozzle), the decrease of spinnability such as broken wires, etc. can be avoided in the spinning process. In addition, even if spinning can be carried out, problems such as broken wires will occur in the stretching process, and sometimes it is difficult to evenly mix and disperse the particles in the spinning raw material. Therefore, from this viewpoint, the average particle size is also preferably below 800nm.

[0062] On the other hand, considering the design properties such as dyeability of the infrared shielding fiber structure containing infrared shielding particles on the fiber surface and / or inside, the infrared shielding particles need to absorb near infrared rays efficiently and perform infrared shielding while maintaining transparency. The infrared shielding particles selected from tungsten oxide particles and composite tungsten oxide particles can transmit the visible light region (wavelength 380nm~780nm), and absorb the near infrared region, especially the light near the wavelength 780~2200nm, so the transmission color tone mostly changes from blue to green. Therefore, if the particle size (particle diameter) of the infrared shielding particles is less than 800nm, transparency can be ensured, but in the case of attaching importance to transparency, the particle size is 200nm or less, and more preferably 100nm or less. On the other hand, if the particle size is 1nm or more, it is easy to manufacture industrially, so the particle size (particle diameter) of the infrared shielding particles needs to be 1nm or more and 800nm ​​or less.

[0063] (3) Content of infrared shielding particles on the fiber surface and / or inside

[0064] Since the infrared absorption capacity per unit weight of the above-mentioned tungsten oxide particles and composite tungsten oxide particles is very high, the effect can be exerted at a usage amount of about 1 / 4 to 1 / 10 compared with ITO and ATO. When the composite tungsten oxide particles have a hexagonal crystal structure and K, Rb, and Cs are used as the M element, the ability to absorb infrared rays above 780nm is particularly excellent, so it is suitable for preventing infrared sneak shots (preventing perspective using CCD cameras). On the other hand, in the above-mentioned ITO and ATO, infrared absorption in the wavelength range of 780nm to 900nm cannot be expected. Therefore, for infrared shielding fiber structures using ITO and ATO, the effect of preventing infrared sneak shots (preventing perspective using CCD cameras) cannot be expected.

[0065] Furthermore, the content of infrared shielding particles (tungsten oxide particles or composite tungsten oxide particles) contained on the fiber surface and / or inside is preferably set between 0.001% by weight and 80% by weight. When the weight of the fiber after adding infrared shielding particles and the cost of raw materials are considered, the above content is further preferably set between 0.005% by weight and 50% by weight. If the content of infrared shielding particles is 0.001% by weight or more, even if the blank (infrared shielding fiber structure) is thin, the effect of sufficient infrared absorption can be obtained. If it is 80% by weight or less, the blockage of the die mouth (nozzle), the reduction of spinnability caused by broken yarns, etc. can be avoided in the spinning process. If it is 50% by weight or less, the addition amount of infrared shielding particles can be small, so the physical properties of the fiber will not be damaged.

[0066] (4) Content of infrared shielding fine particles per unit area of ​​infrared shielding fiber structure

[0067] As described above, the content of the infrared shielding fine particles per unit area of ​​the infrared shielding fiber structure is 0.10 g / m 2 Above and 4.5g / m 2 Below, preferably 0.15g / m 2 More preferably, 0.20 g / m 2 If the content of infrared shielding fine particles per unit area of ​​the infrared shielding fiber structure is 0.10 g / m 2 If the average reflectivity of the infrared shielding fiber structure is 65% or less in the infrared region (wavelength 800nm ​​to 1300nm), it is possible to make the average reflectivity of the infrared shielding fiber structure in the infrared region (wavelength 800nm ​​to 1300nm) 65% or less. If the average reflectivity of the infrared shielding fiber structure is 65% or less, then in clothing made of the infrared shielding fiber structure as textiles or woven fabrics, infrared voyeurism (using the perspective of a CCD camera) can be prevented. The average reflectivity of the infrared shielding fiber structure is more preferably 60% or less, and further preferably 55% or less. It should be noted that in order to set the average reflectivity of the infrared shielding fiber structure to 60% or less, it is necessary to set the above-mentioned content of infrared shielding particles per unit area of ​​the infrared shielding fiber structure to 0.15g / m 2 In order to make the average reflectance 55% or less, the content of the infrared shielding fine particles needs to be 0.20 g / m 2 above.

[0068] On the other hand, if the content of the infrared shielding fine particles per unit area of ​​the infrared shielding fiber structure is greater than 4.5 g / m 2 , the average reflectivity is lower than 0.07%, but even if the average reflectivity is adjusted to a lower value, the effect of preventing voyeurism using infrared rays will not be further improved. Therefore, the upper limit of the content of infrared shielding particles per unit area of ​​the infrared shielding fiber structure is preferably 3.5 g / m 2 If the content of infrared shielding particles per unit area is 3.5 g / m 2 , the average reflectivity is below 0.2%, and the effect of preventing voyeurism using infrared rays is fully exerted. However, when the infrared shielding fiber structure contains excessive infrared shielding particles per unit area, it may be difficult to develop the color depending on the color of the infrared shielding fiber structure dyed.

[0069] It should be noted that the average reflectivity of the fiber structure containing no infrared shielding particles in the infrared region (wavelength 800nm ​​to 1300nm) is 77% as confirmed in the following Comparative Example 1. At this reflectivity, infrared light can be used for candid photography (using CCD camera perspective).

[0070] The average reflectance is an average value of the reflectance in the infrared shielding fiber structure measured by a spectrophotometer at a wavelength of 800 nm to 1300 nm with the wavelength increased by 5 nm.

[0071] Here, regarding a solution for preventing surreptitious photography using infrared rays (see-through using a CCD camera), the present invention will be described with attention paid to the reflectivity of the infrared shielding fiber structure.

[0072] When we observe an object with our eyes, we can recognize the object because the light that hits the object is reflected, and an image of the object can be formed with our eyes. The same is true for images taken with a camera.

[0073] Furthermore, in the infrared shielding fiber structure of the present invention, infrared shielding particles that absorb infrared rays are contained on the fiber surface and / or inside. When light is irradiated to the infrared shielding fiber structure, the infrared shielding particles absorb infrared rays, and therefore, the reflectivity in the infrared region (wavelength 800nm ​​to 1300nm) becomes low. That is, among the light components irradiated to the infrared shielding fiber structure of the present invention, the reflectivity of infrared rays decreases. As a result, even if an attempt is made to photograph the infrared shielding fiber structure of the present invention with a CCD camera, the image will be unclear due to the decrease in reflectivity at a wavelength of 800nm ​​to 1300nm.

[0074] It should be noted that the wavelength region of the widely used CCD sensor is known to be 400nm to 1200nm. For the infrared shielding fiber structure of the present invention, the reflectivity of the infrared region (wavelength 800nm ​​to 1300nm) is reduced in the irradiated light component, so it can prevent the use of infrared sneak shots (using the perspective of the CCD camera).

[0075] On the other hand, the above-mentioned infrared shielding particles (tungsten oxide particles or composite tungsten oxide particles) used in the present invention absorb little light in the visible light region compared to the absorption of light in the infrared region (wavelength 800nm ​​to 1300nm). That is, since the infrared shielding particles of the present invention absorb little light in the visible light region, the infrared shielding fiber structure can be freely colored by dyeing or the like. Furthermore, when the infrared shielding fiber structure of the present invention is used for clothing, the amount of infrared rays contained in natural light that reaches human skin can be reduced, thereby reducing damage to the skin.

[0076] (5) Infrared shielding fiber

[0077] The fiber used for the infrared shielding fiber of the present invention can be selected in various ways according to the application, and any one of synthetic fiber, semi-synthetic fiber, natural fiber, regenerated fiber, inorganic fiber, and mixed yarn obtained by blending, doubling, and mixing synthetic fiber, semi-synthetic fiber, natural fiber, regenerated fiber, and inorganic fiber can be used. Furthermore, considering that inorganic particles can be contained in the fiber by a simple method and the heat preservation continuity is good, synthetic fiber is preferred.

[0078] (5-1) Synthetic Fiber

[0079] The synthetic fiber used for the infrared shielding fiber of the present invention is 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.

[0080] For example, examples of polyamide-based fibers include nylon, nylon 6, nylon 66, nylon 11, nylon 610, nylon 612, aromatic nylon, and aramid.

[0081] In addition, examples of acrylic fibers include polyacrylonitrile, acrylonitrile-vinyl chloride copolymer, and modified polyacrylonitrile.

[0082] Moreover, as a polyester-based fiber, for example, polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, etc. are mentioned.

[0083] In addition, for example, examples of polyolefin-based fibers include polyethylene, polypropylene, and polystyrene.

[0084] In addition, examples of polyvinyl alcohol-based fibers include vinylon and the like.

[0085] Moreover, as a polyvinylidene chloride type fiber, vinylidene fiber etc. are mentioned, for example.

[0086] Moreover, as a polyvinyl chloride type fiber, polyvinyl chloride fiber etc. are mentioned, for example.

[0087] In addition, for example, examples of polyetherester-based fibers include Rexe fibers and Success fibers.

[0088] (5-2) Semisynthetic fibers

[0089] When the fiber used for the infrared shielding fiber of the present invention is a semi-synthetic fiber, examples thereof include cellulose-based fibers, protein-based fibers, chlorinated rubber, hydrochloric acid rubber, and the like.

[0090] In addition, examples of cellulose fibers include acetate, triacetate, oxyacetate, and the like.

[0091] In addition, for example, examples of protein fibers include Promix fibers and the like.

[0092] (5-3) Natural Fibers

[0093] When the fiber used for the infrared shielding fiber of the present invention is a natural fiber, examples thereof include plant fibers, animal fibers, and mineral fibers.

[0094] Examples of the plant fiber include cotton, kapok, flax, hemp, jute, Manila hemp, sisal, New Zealand hemp, ramie, coconut fiber, rush fiber, and wheat straw fiber.

[0095] Examples of animal fibers include wool such as goat hair, mohair, cashmere, alpaca, angora, camel hair, and llama hair, silk, down, and feathers.

[0096] In addition, examples of mineral fibers include asbestos and asbestos.

[0097] (5-4) Regenerated Fiber

[0098] When the fiber used for the infrared shielding fiber of the present invention is a regenerated fiber, examples thereof include cellulose-based fibers, protein-based fibers, alginate fibers, rubber fibers, chitin fibers, and mannan fibers.

[0099] Moreover, as a cellulosic fiber, rayon, viscose fiber, cupra, polynosic, copper ammonia rayon etc. are mentioned, for example.

[0100] Moreover, as a protein-based fiber, for example, casein fiber, peanut protein fiber, corn protein fiber, soybean protein fiber, regenerated silk etc. are mentioned.

[0101] (5-5) Inorganic Fiber

[0102] When the fiber used for the infrared shielding fiber of the present invention is an inorganic fiber, for example, metal fiber, carbon fiber, silicate fiber, etc. are mentioned.

[0103] In addition, for example, examples of the metal fiber include metal fibers, gold fibers, silver fibers, and heat-resistant alloy fibers.

[0104] In addition, examples of silicate fibers include glass fibers, slag fibers, rock fibers, and the like.

[0105] (6) Cross-sectional shape of infrared shielding fibers, etc.

[0106] The cross-sectional shape of the infrared shielding fiber of the present invention is not particularly limited, and for example, circular, triangular, hollow, flat, Y-shaped, star-shaped, core-sheath-shaped, etc. can be cited. The particles contained on the surface and / or inside of the fiber can be in various shapes. For example, in the case of a core-sheath-shaped fiber, the particles can be contained in the core of the fiber or in the sheath. In addition, the shape of the infrared shielding fiber can be a filament (long fiber) or a staple (short fiber).

[0107] Furthermore, the infrared shielding fiber of the present invention may contain an antioxidant, a flame retardant, a deodorant, an insect repellent, an antibacterial agent, an ultraviolet absorber, etc., depending on the purpose, within a range that does not impair the performance of the fiber.

[0108] (7) Method of containing infrared shielding particles on the surface and / or inside of fibers

[0109] There is no particular limitation on the method of making the fiber surface and / or inside contain infrared shielding particles of the present invention. For example, there can be cited (A) a method of directly mixing the above-mentioned infrared shielding particles into the raw polymer of the synthetic fiber for spinning, (B) a method of pre-manufacturing a masterbatch containing a high concentration of the above-mentioned infrared shielding particles in a part of the raw polymer, and diluting it to a specified concentration before spinning, (C) a method of pre-dispersing the above-mentioned infrared shielding particles in a raw monomer or oligomer solution, synthesizing the target raw polymer using the dispersed solution, and spinning the infrared shielding particles after uniformly dispersing them in the raw polymer, (D) a method of attaching the above-mentioned infrared shielding particles to the surface of the fiber obtained by pre-spinning using an adhesive, etc.

[0110] Here, a preferred example of the method of producing a masterbatch described in the above (B), and diluting and adjusting the masterbatch during spinning and then spinning the masterbatch will be described in detail below.

[0111] The method for manufacturing the masterbatch is not particularly limited. For example, a mixer such as a ribbon mixer, a drum, a Nauta mixer, a Henschel mixer, a super mixer, a planetary mixer, and a mixer such as a Banbury mixer, a kneader, a roller, a kneading extruder, a single-screw extruder, and a twin-screw extruder are used to uniformly melt-mix the tungsten oxide particles and / or composite tungsten oxide particle dispersion, a powder or granules of a thermoplastic resin, and other additives as needed while removing the solvent, thereby preparing a masterbatch by preparing a mixture in which the particles are uniformly dispersed in the thermoplastic resin.

[0112] Furthermore, after preparing a dispersion of tungsten oxide particles and / or composite tungsten oxide particles, the solvent of the dispersion can be removed by a known method, and the obtained powder, a powder or granules of a thermoplastic resin, and other additives as needed can be uniformly melt-mixed to prepare a mixture in which the particles are uniformly dispersed in a thermoplastic resin. In addition, a method in which a powder of tungsten oxide particles and / or composite tungsten oxide particles is directly added to a thermoplastic resin and uniformly melt-mixed can also be used.

[0113] A masterbatch containing infrared shielding fine particles can be obtained by kneading a mixture of the tungsten oxide fine particles and / or composite tungsten oxide fine particles obtained by the above method and a thermoplastic resin using a vented single-screw or double-screw extruder and processing into pellets.

[0114] Here, the above methods (A) to (D) are described in detail below.

[0115] Method (A): For example, when polyester fibers are used as fibers, a dispersion of tungsten oxide particles and / or composite tungsten oxide particles is added to polyethylene terephthalate resin particles as a thermoplastic resin, and the mixture is uniformly mixed with a stirrer, and then the solvent is removed. The mixture after the solvent is removed is melt-kneaded with a twin-screw extruder to obtain a masterbatch containing tungsten oxide particles and / or composite tungsten oxide particles. The obtained masterbatch containing tungsten oxide particles and / or composite tungsten oxide particles is melt-mixed near the melting temperature of the resin and spun according to a conventional method.

[0116] Method (B): In addition to using a pre-prepared masterbatch containing tungsten oxide particles and / or composite tungsten oxide particles, the masterbatch containing tungsten oxide particles and / or composite tungsten oxide particles and a target amount of a masterbatch composed of polyethylene terephthalate without adding particles are melt-mixed near the melting temperature of the resin in the same manner as (A), and spinning is carried out according to a conventional method.

[0117] Method (C): For example, when urethane fibers are used as fibers, a polymer diol containing tungsten oxide particles and / or composite tungsten oxide particles and an organic diisocyanate are reacted 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 spun according to a conventional method.

[0118] (D) Method: For example, in order to attach infrared ray shielding fine particles to the surface of natural fibers, first, a treatment liquid is prepared by mixing tungsten oxide fine particles and / or composite tungsten oxide fine particles, at least one binder resin selected from acrylic resin, epoxy resin, urethane resin, and polyester resin, and a solvent such as water. Then, by immersing the natural fibers in the prepared treatment liquid, or by impregnating the prepared treatment liquid into the natural fibers using filling, printing, spraying, etc., and drying, tungsten oxide fine particles and / or composite tungsten oxide fine particles can be attached to the natural fibers. Moreover, the method of (D) can be applied not only to the above-mentioned natural fibers, but also to any one of semi-synthetic fibers, regenerated fibers, inorganic fibers, or their blends, plies, or mixed filaments.

[0119] It should be noted that when implementing the above methods (A) to (D), the dispersion method of tungsten oxide fine particles and / or composite tungsten oxide fine particles can be any method as long as it can evenly disperse the above fine particles in the liquid. For example, methods such as a media stirring mill, a ball mill, a sand mill, and ultrasonic dispersion can be preferably used.

[0120] In addition, the dispersion medium of the above infrared ray shielding fine particles is not particularly limited and can be selected according to the mixed fibers. For example, various general organic solvents such as alcohols, ethers, esters, ketones, and aromatic compounds, and water can be used.

[0121] Furthermore, when attaching the above infrared ray shielding fine particles to the fibers or the polymers used as their raw materials and mixing them, the dispersion liquid of the infrared ray shielding fine particles can be directly mixed into the fibers or the polymers used as their raw materials. Additionally, if necessary, an acid or a base can be added to the dispersion liquid of the infrared ray shielding fine particles to adjust the pH. In order to further improve the dispersion stability of the fine particles, it is also preferable to add various surfactants, coupling agents, etc.

[0122] In addition, in order to improve the weather resistance of the above infrared ray shielding fine particles, it is also preferable to coat the surfaces of tungsten oxide fine particles and / or composite tungsten oxide fine particles with a compound containing one or more elements selected from silicon, zirconium, titanium, and aluminum. These compounds are basically transparent, and adding these compounds will not reduce the visible light transmittance of the above infrared ray shielding fine particles, so the appearance design of the fibers will not be damaged.

[0123] Furthermore, in order to improve the chemical resistance of the above-mentioned infrared shielding particles, the surface of the tungsten oxide particles and / or composite tungsten oxide particles can be coated with thermoplastic resins 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, ethylene-vinyl acetate copolymer resin, or thermosetting resins such as phenolic resin, epoxy resin, melamine resin, urea resin, unsaturated polyester resin, alkyd resin, thermosetting polyurethane resin, polyimide resin, silicone resin, etc.

[0124] As described above, the infrared shielding fiber of the present invention can shield infrared rays by containing a small amount of tungsten oxide fine particles and / or composite tungsten oxide fine particles as a heat shielding component on the fiber surface and / or inside.

[0125] According to the purpose, the infrared shielding fiber is processed into long fibers or short fibers, and then woven and processed into textiles or woven fabrics by known methods to form infrared shielding fiber structures. In addition, the infrared shielding fiber is processed by known methods to form non-woven fabrics to form infrared shielding fiber structures. Of course, the silk (textile yarn) woven from the infrared shielding fiber can also be colorless or dyed. In addition, infrared shielding fiber structures such as textiles, woven fabrics, and non-woven fabrics can also be partially or entirely dyed.

[0126] The infrared shielding fiber structure of the present invention has good weather resistance and is colorless, and the amount of infrared shielding particles added is small, so the fiber structure and the resulting clothes can be dyed with a high degree of freedom, so that the appearance design is not damaged, and the basic physical properties of the fiber such as strength and elongation can be avoided. As a result, the infrared shielding fiber structure of the present invention can prevent infrared voyeurism (using CCD camera perspective) without damaging the basic physical properties of the fiber product, and can therefore be used for underwear, sportswear, stockings and other clothes.

[0127] (8) Method for producing infrared shielding fine particles

[0128] Next, in the method for producing infrared shielding fine particles of the present invention, the following example illustrates the method of producing infrared shielding fine particles of the general formula WO X The tungsten oxide particles represented by the general formula M Y WO Z A method for producing composite tungsten oxide fine particles is shown.

[0129] The tungsten oxide nanoparticles and / or composite tungsten oxide nanoparticles can be obtained by weighing a predetermined amount of a tungsten compound as a starting material for the oxide nanoparticles, mixing the mixture, and then heat treating the mixture in an inert gas atmosphere or a reducing gas atmosphere.

[0130] The tungsten compound used as the starting material is preferably any one or more selected from tungsten trioxide powder, tungsten dioxide powder, hydrate of tungsten oxide, tungsten hexachloride powder, ammonium tungstate powder, hydrate powder of tungsten oxide obtained by dissolving tungsten hexachloride in alcohol and then drying, hydrate powder of tungsten oxide obtained by dissolving tungsten hexachloride in alcohol and then adding water to precipitate it and drying it, tungsten compound powder obtained by drying an ammonium tungstate aqueous solution, and metal tungsten powder.

[0131] Here, when manufacturing tungsten oxide microparticles, it is more preferable to use hydrate powder of tungsten oxide, tungsten trioxide, and tungsten compound powder obtained by drying ammonium tungstate aqueous solution from the viewpoint of ease of manufacturing process. When manufacturing composite tungsten oxide microparticles, if the starting material is a solution, it is more preferable to use ammonium tungstate aqueous solution and tungsten hexachloride solution from the viewpoint that each element can be easily and uniformly mixed. Using these raw materials, heat treatment is performed in an inert gas environment or a reducing gas environment, thereby obtaining tungsten oxide microparticles and / or composite tungsten oxide microparticles having the above-mentioned infrared shielding function.

[0132] In addition, the starting material of the composite tungsten oxide fine particles with infrared shielding function is the same tungsten compound as the starting material of the fine particles with infrared shielding function containing the above-mentioned tungsten oxide fine particles, but a tungsten compound containing element M in the form of an elemental monomer or a compound is also used as a starting material. Here, in order to produce a tungsten compound, which is a starting material in which each component is uniformly mixed at the molecular level, it is preferred to mix each raw material with a solution, and the tungsten compound containing element M is preferably a substance that can be dissolved in a solvent such as water or an organic solvent. For example, tungstates, chlorides, nitrates, sulfates, oxalates, oxides, carbonates, hydroxides, etc. containing element M can be cited, but it is not limited thereto, and a substance in a solution state is preferred.

[0133] The raw materials used for producing the above-mentioned tungsten oxide fine particles and composite tungsten oxide fine particles will be described again in detail below.

[0134] As for the general formula WO XThe starting material of the tungsten oxide particles represented, i.e., the tungsten compound, can be any one or more selected from tungsten trioxide powder, tungsten dioxide powder, hydrate of tungsten oxide, tungsten hexachloride powder, ammonium tungstate powder, hydrate powder of tungsten oxide obtained by dissolving tungsten hexachloride in alcohol and then drying, hydrate powder of tungsten oxide obtained by dissolving tungsten hexachloride in alcohol and then adding water to precipitate it and drying it, tungsten compound powder obtained by drying an ammonium tungstate aqueous solution, and metal tungsten powder. However, from the viewpoint of the ease of the manufacturing process, it is further preferred to use hydrate powder of tungsten oxide, tungsten trioxide powder, and tungsten compound powder obtained by drying an ammonium tungstate aqueous solution.

[0135] As a method for obtaining the element M, the general formula M Y WO Z The starting material of the composite tungsten oxide particles represented can be a powder obtained by mixing any one or more powders selected from tungsten trioxide powder, tungsten dioxide powder, hydrate of tungsten oxide, tungsten hexachloride powder, ammonium tungstate powder, hydrate powder of tungsten oxide obtained by dissolving tungsten hexachloride in alcohol and then drying, hydrate powder of tungsten oxide obtained by dissolving tungsten hexachloride in alcohol and then adding water to precipitate it and drying it, tungsten compound powder obtained by drying an ammonium tungstate aqueous solution, and metal tungsten powder with a powder of a monomer or compound containing the above-mentioned M element.

[0136] Furthermore, if the tungsten compound as a starting material for obtaining the composite tungsten oxide fine particles is a solution or a dispersion, each element can be easily and uniformly mixed.

[0137] From this viewpoint, the starting material of the composite tungsten oxide fine particles is more preferably a powder obtained by mixing an alcohol solution of tungsten hexachloride or an aqueous solution of ammonium tungstate with a solution of a compound containing the above-mentioned M element and then drying the mixture.

[0138] Similarly, the starting material of the composite tungsten oxide particles is preferably a powder obtained by mixing a dispersion prepared by dissolving tungsten hexachloride in alcohol and then adding water to generate a precipitate with a powder of a monomer or compound containing the above-mentioned M element or a solution containing the above-mentioned M element compound and then drying the mixture.

[0139] As the compound containing the above-mentioned M element, there can be cited tungstates, chlorides, nitrates, sulfates, oxalates, oxides, carbonates, hydroxides, etc. of the M element, but it is not limited thereto, as long as it is a compound in a solution state. Furthermore, when the composite tungsten oxide particles are manufactured industrially, if hydrate powder of tungsten oxide, tungsten trioxide, and carbonates or hydroxides of the M element are used, no harmful gas will be generated during the heat treatment stage, etc., which is a preferred manufacturing method.

[0140] Here, the heat treatment conditions for the tungsten oxide particles and composite tungsten oxide particles in an inert atmosphere are preferably 650°C or higher. The starting material after heat treatment at 650°C or higher has sufficient infrared shielding function, and is highly efficient as particles having infrared shielding function. It is preferred to use Ar, N 2 In addition, as the heat treatment conditions in a reducing atmosphere, it is preferred that the starting material is first heat treated at a temperature of 100°C to 850°C in a reducing atmosphere, and then heat treated at a temperature of 650°C to 1200°C in an inert atmosphere. The reducing gas at this time is not particularly limited, but H 2 In addition, when using H 2 When used as a reducing gas, H 2 The volume ratio is preferably 0.1% or more, and more preferably 2% or more. 2 When the volume ratio is 0.1% or more, reduction can be efficiently performed.

[0141] Example

[0142] Hereinafter, the embodiments of the present invention will be described in detail with reference to comparative examples.

[0143] [Example 1]

[0144] 10 parts by weight of Cs 0.33 WO 3 Particles (surface area 20m 2 / g), 80 parts by weight of toluene, and 10 parts by weight of a dispersant for fine particle dispersion were mixed and dispersed using a medium stirring mill to prepare Cs 0.33 WO 3 Microparticle dispersion (liquid a).

[0145] Then, a spray dryer was used to remove Cs 0.33 WO 3 The microparticle dispersion (liquid a) was added toluene to obtain Cs 0.33 WO 3 Microparticle dispersion powder (a powder).

[0146] The obtained Cs 0.33 WO 3 The fine particle dispersion powder (a powder) was added to polyethylene terephthalate resin pellets as a thermoplastic resin, and after being uniformly mixed with a stirrer, the mixture was melt-kneaded and extruded with a twin-screw extruder, and the extruded strands were cut into pellets to obtain a Cs-containing infrared absorbing component containing 80% by weight. 0.33 WO 3 particle.

[0147] The obtained masterbatch a and the masterbatch without adding Cs prepared by the same method 0.33 WO 3 The master batch b composed of polyethylene terephthalate particles was mixed at a weight ratio of 1:1 to obtain a master batch containing 40 wt% of Cs 0.33 WO 3 It should be noted that the Cs when producing the mixed masterbatch was observed based on the dark field image of the individual diffraction rings using a TEM (transmission electron microscope). 0.33 WO 3 The average particle size of the microparticles is 25 nm.

[0148] Then, the above Cs 0.33 WO 3 The mixed masterbatch of the microparticles was melt-spun and then stretched to produce a polyester multifilament a, which was then cut to produce a polyester multifilament containing 40 wt % of Cs 0.33 WO 3 Microparticles of polyester staple fibersa.

[0149] In addition, for Cs-free 0.33 WO 3 The master batch b containing microparticles was melt-spun and then stretched to produce a polyester multifilament b. The polyester multifilament b was cut in the same manner as above to produce a Cs-free polyester multifilament. 0.33 WO 3 Microparticles of polyester staple fibers b.

[0150] Then, a 40 wt% Cs 0.33 WO 3 Micro-particle polyester staple fiber a and Cs-free 0.33 WO 3 The microparticle polyester staple fiber b was used to produce a spun yarn, and a knitted product (infrared shielding fiber structure) was produced using the spun yarn. The obtained knitted product was dyed brown with a cationic dye to produce the knitted product of Example 1.

[0151] It should be noted that dyeing is performed to obtain the knitted product of Example 1 in order to avoid the situation where the undyed white knitted product can be seen through even by visible light.

[0152] (Average reflectivity of the knitted product of Example 1)

[0153] When producing the above-mentioned spun yarn, the content of Cs is appropriately set to 40% by weight. 0.33 WO 3 Micro-particle polyester staple fiber a and Cs-free 0.33 WO 3The mixing ratio of the polyester staple fibers b was adjusted to Cs per unit area of ​​the knitted product of Example 1. 0.33 WO 3 The content of microparticles is 0.13g / m 2 .

[0154] Then, the reflectance of the knitted product of Example 1 was measured at a wavelength of 800 nm to 1300 nm at intervals of 5 nm using a spectrophotometer manufactured by Hitachi, Ltd. Figure 1 The spectral characteristics shown in FIG. 1 show that the knitted product of Example 1 has an average reflectance of 62% at a wavelength of 800 nm to 1300 nm.

[0155] (Evaluation of the knitted product of Example 1)

[0156] Then, evaluation regarding "prevention of sneak photography using infrared rays (see-through using a CCD camera)" of the knitted product of Example 1 was performed using the following test method in accordance with the Boken standard "BQE A 033" of the Japan Textile Inspection Association.

[0157] "Test Methods"

[0158] (1) Cover the test piece of the knitted product (infrared shielding fiber structure) on the transmission judgment plate (eyesight test chart) and set it on the test stand.

[0159] (2) Use an infrared projector with a power of about 7mW / cm 2 Light of intensity is projected onto the surface of the test piece.

[0160] (3) Use a digital camera to take a normal photo of the test piece.

[0161] (4) Use an infrared camera to take a transmission image of the test piece.

[0162] (5) Check the image after transmission photography to determine whether infrared rays are transmitted.

[0163] "Judgment Result"

[0164] The knitted product of Example 1 did not show any infrared transmission.

[0165] The results are shown in Table 1 below.

[0166] [Example 2]

[0167] The polyester staple fibers a and the polyester staple fibers b were used to produce spun yarns, and knitted products (infrared shielding fiber structures) were produced using the spun yarns. The obtained knitted products were dyed in the same manner as in Example 1, thereby producing knitted products of Example 2.

[0168] When producing the above-mentioned spun yarn, the content of Cs is appropriately set to 40% by weight. 0.33 WO 3 Micro-particle polyester staple fiber a and Cs-free 0.33 WO 3 The mixing ratio of the polyester staple fibers b was adjusted to Cs per unit area of ​​the knitted product of Example 2. 0.33 WO 3 The particle content is 0.17g / m 2 , except that the same procedure as in Example 1 was followed to obtain Figure 1 The spectral characteristics shown in FIG. 1 show that, according to the spectral characteristics, the average reflectance of the knitted product of Example 2 under the condition of a wavelength of 800 nm to 1300 nm is 58%.

[0169] (Evaluation of Knitted Product of Example 2)

[0170] As in Example 1, evaluation regarding "prevention of secret photography using infrared rays (see-through using a CCD camera)" was performed. As a result, the transmission of infrared rays was not observed in the knitted product of Example 2 either.

[0171] The results are also shown in Table 1 below.

[0172] [Example 3]

[0173] The polyester staple fibers a and b were used to produce spun yarns, and knitted products (infrared shielding fiber structures) were produced using the spun yarns. The obtained knitted products were dyed in the same manner as in Example 1, thereby producing knitted products of Example 3.

[0174] When producing the above-mentioned spun yarn, the content of Cs is appropriately set to 40% by weight. 0.33 WO 3 Micro-particle polyester staple fiber a and Cs-free 0.33 WO 3 The mixing ratio of the polyester staple fibers b of the microparticles was adjusted to Cs per unit area of ​​the knitted product of Example 3. 0.33 WO 3 The content of microparticles is 0.26g / m 2 , except that the same procedure as in Example 1 was followed to obtain Figure 1 The spectral characteristics shown in FIG. 1 show that the knitted product of Example 3 has an average reflectance of 50% under the wavelength condition of 800 nm to 1300 nm.

[0175] (Evaluation of Knitted Product of Example 3)

[0176] As in Example 1, evaluation regarding "prevention of secret photography using infrared rays (see-through using a CCD camera)" was performed. As a result, the transmission of infrared rays was not observed in the knitted product of Example 3 either.

[0177] The results are also shown in Table 1 below.

[0178] [Example 4]

[0179] The polyester staple fibers a and b were used to produce spun yarns, and knitted products (infrared shielding fiber structures) were produced using the spun yarns. The obtained knitted products were dyed in the same manner as in Example 1, thereby producing knitted products of Example 4.

[0180] When producing the above-mentioned spun yarn, the content of Cs is appropriately set to 40% by weight. 0.33 WO 3 Micro-particle polyester staple fiber a and Cs-free 0.33 WO 3 The mixing ratio of the polyester staple fibers b of the microparticles was adjusted to Cs per unit area of ​​the knitted product of Example 4. 0.33 WO 3 The particle content is 0.87g / m 2 , except that the same procedure as in Example 1 was followed to obtain Figure 1 The spectral characteristics shown in FIG. 1 show that, according to the spectral characteristics, the average reflectance of the knitted product of Example 4 under the condition of a wavelength of 800 nm to 1300 nm is 18%.

[0181] (Evaluation of Knitted Product of Example 4)

[0182] As in Example 1, evaluation regarding "prevention of secret photography using infrared rays (see-through using a CCD camera)" was performed. As a result, the transmission of infrared rays was not observed in the knitted product of Example 4 either.

[0183] The results are also shown in Table 1 below.

[0184] [Example 5]

[0185] The polyester staple fibers a and b were used to produce spun yarns, and knitted products (infrared shielding fiber structures) were produced using the spun yarns. The obtained knitted products were dyed in the same manner as in Example 1, thereby producing knitted products of Example 5.

[0186] When producing the above-mentioned spun yarn, the content of Cs is appropriately set to 40% by weight. 0.33 WO 3 Micro-particle polyester staple fiber a and Cs-free 0.33 WO 3The mixing ratio of the polyester staple fiber b of the fine particles was adjusted to Cs per unit area of the knitted product of Example 5. 0.33 WO 3 The content of the fine particles was 1.73 g / m. 2 Except for this, it was carried out in the same manner as in Example 1, and as a result, Figure 1 the spectroscopic characteristics shown in FIG. 8 were obtained. According to these spectroscopic characteristics, the average reflectance of the knitted product of Example 5 under the conditions of a wavelength of 800 nm to 1300 nm was 4%.

[0187] (Evaluation of the knitted product of Example 5)

[0188] In the same manner as in Example 1, an evaluation related to "prevention of infrared peeping (perspective using a CCD camera)" was carried out. As a result, infrared transmission was not observed in the knitted product of Example 5 either.

[0189] This result is also shown in Table 1 below.

[0190] [Example 6]

[0191] A textile yarn was produced using the above-mentioned polyester staple fiber a and polyester staple fiber b, and a knitted product (infrared shielding fiber structure) was produced using this textile yarn. The obtained knitted product was dyed in the same manner as in Example 1 to produce the knitted product of Example 6.

[0192] Moreover, when manufacturing the above-mentioned textile yarn, the mixing ratio of the polyester staple fiber a containing 40% by weight of Cs 0.33 WO 3 fine particles and the polyester staple fiber b not containing Cs 0.33 WO 3 fine particles was adjusted to Cs per unit area of the knitted product of Example 6. 0.33 WO 3 The content of the fine particles was 2.60 g / m. 2 Except for this, it was carried out in the same manner as in Example 1, and as a result, Figure 1 the spectroscopic characteristics shown in FIG. 41 were obtained. According to these spectroscopic characteristics, the average reflectance of the knitted product of Example 6 under the conditions of a wavelength of 800 nm to 1300 nm was 1%.

[0193] (Evaluation of the knitted product of Example 6)

[0194] In the same manner as in Example 1, an evaluation related to "prevention of infrared peeping (perspective using a CCD camera)" was carried out. As a result, infrared transmission was not observed in the knitted product of Example 6 either.

[0195] This result is also shown in Table 1 below.

[0196] [Example 7]

[0197] The polyester staple fibers a and b were used to produce spun yarns, and knitted products (infrared shielding fiber structures) were produced using the spun yarns. The obtained knitted products were dyed in the same manner as in Example 1, thereby producing knitted products of Example 7.

[0198] When producing the above-mentioned spun yarn, the content of Cs is appropriately set to 40% by weight. 0.33 WO 3 Micro-particle polyester staple fiber a and Cs-free 0.33 WO 3 The mixing ratio of the polyester staple fibers b was adjusted to Cs per unit area of ​​the knitted product of Example 7. 0.33 WO 3 The particle content is 4.33g / m 2 , except that the same procedure as in Example 1 was followed to obtain Figure 1 The spectral characteristics shown in FIG. 1 show that, according to the spectral characteristics, the average reflectance of the knitted product of Example 7 under the condition of a wavelength of 800 nm to 1300 nm is 0.07%.

[0199] (Evaluation of Knitted Product of Example 7)

[0200] As in Example 1, evaluation regarding "prevention of secret photography using infrared rays (see-through using a CCD camera)" was performed. As a result, the transmission of infrared rays was not observed in the knitted product of Example 7 either.

[0201] The results are also shown in Table 1 below.

[0202] [Comparative Example 1]

[0203] Use only Cs-free 0.33 WO 3 A spun yarn was produced by using the polyester staple fibers b containing the microparticles, and a knitted product was produced using the spun yarn. The obtained knitted product was dyed in the same manner as in Example 1, thereby obtaining a knitted product of Comparative Example 1.

[0204] Then, the reflectance of the knitted product of Comparative Example 1 was measured at a wavelength of 800 nm to 1300 nm at intervals of 5 nm using a spectrophotometer manufactured by Hitachi, Ltd. Figure 1 The spectral characteristics shown in FIG. 1 show that the knitted product of Comparative Example 1 has an average reflectance of 77% at a wavelength of 800 nm to 1300 nm.

[0205] (Evaluation of Knitted Product of Comparative Example 1)

[0206] As in Example 1, evaluation was performed on "prevention of secret photography using infrared rays (see-through using a CCD camera)". As a result, the knitted product of Comparative Example 1 was observed to be transparent to infrared rays.

[0207] The results are also shown in Table 1 below.

[0208] [Comparative Example 2]

[0209] The polyester staple fibers a and b were used to produce spun yarns, and knitted products (infrared shielding fiber structures) were produced using the spun yarns. The obtained knitted products were dyed in the same manner as in Example 1 to obtain knitted products of Comparative Example 2.

[0210] When producing the above-mentioned spun yarn, the content of Cs is appropriately set to 40% by weight. 0.33 WO 3 Micro-particle polyester staple fiber a and Cs-free 0.33 WO 3 The mixing ratio of the polyester staple fibers b of the microparticles was adjusted to Cs per unit area of ​​the knitted product of Comparative Example 2. 0.33 WO 3 The particle content is 0.09g / m 2 , except that the same procedure as in Example 1 was followed to obtain Figure 1 The spectral characteristics shown in FIG. 1 show that, according to the spectral characteristics, the knitted product of Comparative Example 2 has an average reflectance of 67% under the wavelength condition of 800 nm to 1300 nm.

[0211] (Evaluation of Knitted Product of Comparative Example 2)

[0212] As in Example 1, evaluation was performed on "prevention of secret photography using infrared rays (see-through using a CCD camera)". As a result, infrared rays were also observed to be transmitted through the knitted product of Comparative Example 2.

[0213] The results are also shown in Table 1 below.

[0214] Table 1

[0215]

[0216] Industrial Applicability

[0217] According to the infrared shielding fiber structure of the present invention, the function of preventing surreptitious photography using infrared rays can be maintained for a long time, and therefore it has industrial applicability to underwear, sportswear, etc. that are easily surreptitious.

Claims

1. An infrared shielding fiber structure, which is an infrared shielding fiber structure processed by processing an infrared shielding fiber containing one or more infrared shielding particles selected from tungsten oxide particles and composite tungsten oxide particles on the surface and / or inside, It is characterized in that The infrared shielding fine particles have a particle size of 1 nm or more and 800 nm or less, The content of infrared shielding fine particles per unit area of ​​the infrared shielding fiber structure is 0.10 g / m 2 Above and 4.5g / m 2 the following.

2. The infrared shielding fiber structure according to claim 1, It is characterized in that The infrared shielding fiber structure has an average reflectivity of 65% or less at a wavelength of 800nm ​​to 1300nm.

3. The infrared shielding fiber structure according to claim 1, It is characterized in that The tungsten oxide particles are of the general formula WO X The tungsten oxide particles represented by: wherein W is tungsten, O is oxygen, 2.45≤X≤2.999, The composite tungsten oxide particles are represented by the general formula M Y WO Z It represents a composite tungsten oxide microparticle having a hexagonal crystal structure, wherein 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, 0.001≤Y≤1.0, and 2.2≤Z≤3.

0.

4. The infrared shielding fiber structure according to claim 3, It is characterized in that The M element of the composite tungsten oxide fine particles is one or more elements selected from Cs, Rb, K, Tl, In, Ba, Li, Ca, Sr, Fe, and Sn.

5. The infrared shielding fiber structure according to claim 1, It is characterized in that The infrared shielding fiber is a fiber selected from any one of synthetic fibers, semi-synthetic fibers, natural fibers, regenerated fibers, inorganic fibers, and mixed yarns obtained by blending, doubling, or mixing synthetic fibers, semi-synthetic fibers, natural fibers, regenerated fibers, and inorganic fibers.

6. The infrared shielding fiber structure according to claim 5, It is characterized in that The synthetic fiber is any one selected from polyurethane fibers, polyamide fibers, acrylic fibers, polyester fibers, polyolefin fibers, polyvinyl alcohol fibers, polyvinylidene chloride fibers, polyvinyl chloride fibers, and polyetherester fibers.

7. The infrared shielding fiber structure according to claim 5, It is characterized in that The semi-synthetic fiber is any one of cellulose fibers, protein fibers, chlorinated rubber, and hydrochloric acid rubber.

8. The infrared shielding fiber structure according to claim 5, It is characterized in that The natural fiber is any natural fiber selected from plant fiber, animal fiber and mineral fiber.

9. The infrared shielding fiber structure according to claim 5, It is characterized in that The regenerated fiber is any one regenerated fiber selected from cellulose fiber, protein fiber, alginate fiber, rubber fiber, chitin fiber, and mannan fiber.

10. A kind of clothing, It is characterized in that The clothing uses the infrared shielding fiber structure according to any one of claims 1 to 3.

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