Infrared transmission-blocking laminated heat-shielding fabric

Abstract

To provide a laminated heat-shielding fabric for preventing infrared transmission that offers an excellent balance between concealment and heat shielding, and has few design restrictions. [Solution] A laminated heat-shielding fabric for preventing infrared transmission, comprising an outer layer fabric and an infrared-absorbing inner layer fabric containing a tungsten-based infrared-absorbing pigment, wherein the opening ratio of the inner layer fabric is 12% or less, and the opening ratio of the outer layer is greater than the opening ratio of the inner layer.

Description

[Technical Field]

[0001] The present invention relates to a laminated heat-shielding fabric for preventing infrared transmission. More specifically, the present invention relates to a laminated fabric that can suppress the temperature rise when irradiated with infrared rays and prevent the transmission of infrared rays, thereby preventing, for example, surreptitious filming using an infrared camera, or X-ray viewing. [Background technology]

[0002] For example, there is a known technique for incorporating infrared absorbing materials into fabrics used in clothing, etc., to alleviate the heat of summer or ensure comfort during exercise, thereby imparting heat-shielding, heat-absorbing, and heat-emitting properties. For instance, Patent Document 1 proposes an infrared-reflective, heat-shielding fabric in which a resin layer containing titanium dioxide is laminated on a base fabric.

[0003] Furthermore, Patent Document 2 proposes a clothing fabric that includes endothermic and radioactive polyester fiber A containing cesium tungsten oxide particles and titanium oxide particles, and polyester fiber B that does not contain cesium tungsten oxide particles, and is treated to absorb and dry quickly. This article explains that this fabric achieves both endothermic and radioactive properties and prevents transparency.

[0004] Furthermore, Patent Document 3 explains that certain tungsten oxides, including tungsten cesium oxide described in Patent Document 2, transmit visible light and are nearly transparent in color, so textile products containing them do not impair their design. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2015-200039 [Patent Document 2] Japanese Patent Publication No. 2023-174494 [Patent Document 3] Japanese Patent Publication No. 2006-132042 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] In recent years, the use of infrared cameras for surreptitious filming and X-ray viewing of athletes and other athletes has become a problem. Sportswear and summer clothing often use thin materials to suppress the decrease in comfort caused by heat generation and sweating during exercise, making them susceptible to infrared light transmission.

[0007] To prevent surreptitious filming and X-ray viewing using infrared cameras, one possible approach is to incorporate infrared-absorbing materials into the fabric of the garment to conceal the interior from infrared light.

[0008] For example, using carbon as an infrared absorber and dyeing fabric with a dye containing carbon would eliminate problems such as surreptitious photography and X-ray vision using infrared cameras. However, using carbon inevitably results in a darker fabric color, which limits the design possibilities of clothing.

[0009] As an infrared absorber, tungsten oxides, such as tungsten cesium oxide, can also be considered. Tungsten oxides are nearly transparent in color and do not significantly impair the design of clothing, but they readily absorb infrared rays and have excellent heat-generating properties. Therefore, increasing the content of tungsten oxides in clothing to prevent surreptitious photography and see-through using infrared cameras reduces heat shielding properties, creating a trade-off where wearing comfort is compromised, especially when applied to sportswear.

[0010] This invention has been made in view of the above circumstances, and its purpose is to provide a laminated heat-shielding fabric for preventing infrared transmission that has an excellent balance between concealment and heat shielding properties and has few design limitations. [Means for solving the problem]

[0011] The present invention is as follows:

[0012] An infrared transmission prevention laminated heat insulation fabric formed by laminating a fabric as an outer layer and an infrared absorptive inner layer fabric containing a tungsten-based infrared absorptive pigment, the aperture ratio of the fabric constituting the inner layer is 12% or less, and the aperture ratio of the outer layer is larger than the aperture ratio of the inner layer, An infrared transmission prevention laminated heat insulation fabric. Aspect 2: The infrared transmission prevention laminated heat insulation fabric according to Aspect 1, wherein a tungsten-based infrared absorptive pigment is adhered to at least a part of the surface of the inner layer on the side opposite to the outer layer. Aspect 3: The infrared transmission prevention laminated heat insulation fabric according to Aspect 1, wherein the aperture ratio of the fabric constituting the inner layer is 2% or more. Aspect 4: The infrared transmission prevention laminated heat insulation fabric according to Aspect 1, wherein the sum of the aperture ratio of the outer layer and the aperture ratio of the inner layer is 10% or more and 57% or less. Aspect 5: The aperture ratio of the inner layer is 2% or more, the sum of the aperture ratio of the outer layer and the aperture ratio of the inner layer is 10% or more and 57% or less, and a tungsten-based infrared absorptive pigment is adhered to at least a part of the surface of the inner layer on the side opposite to the outer layer, The infrared transmission prevention laminated heat insulation fabric according to Aspect 1. Aspect 6: The content ratio of the tungsten-based infrared absorptive pigment per unit area of the inner layer is 2.0 g / m 2 or more and 8.0 g / m 2 or less. The infrared transmission prevention laminated heat insulation fabric according to Aspect 1. Aspect 7: The tungsten-based infrared absorptive pigment is General formula (1): M x W y O z {In the formula, M is one or more elements selected from the group consisting of H, He, alkali metal elements, alkaline earth metal elements, 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; x, y, and z are positive numbers respectively; 0 < x / y ≤ 1; and 2.2 ≤ z / y ≤ 3.0} a composite tungsten oxide represented by, or General formula (2): W y O z {In the formula, W is tungsten; O is oxygen; y and z are positive numbers respectively; and 2.45 ≤ z / y ≤ 2.999} a tungsten oxide having a Magnéli phase represented by, being one or more selected from, the infrared transmission prevention laminated heat insulation fabric according to any one of Aspects 1 to 6. 《Aspect 8》The infrared transmission prevention laminated heat insulation fabric according to Aspect 7, wherein the primary particle size of the tungsten-based infrared absorbing pigment is 10 nm or more and 50 nm or less. 《Aspect 9》The infrared transmission prevention laminated heat insulation fabric according to any one of Aspects 1 to 6, which is for clothing. 《Aspect 10》The infrared transmission prevention laminated heat insulation fabric according to Aspect 9, which is for sports clothing. 《Aspect 11》A clothing including the infrared transmission prevention laminated heat insulation fabric according to any one of Aspects 1 to 6. 《Aspect 12》The clothing according to Aspect 11, which is sports clothing. 《Aspect 13》A method for manufacturing the infrared transmission prevention laminated heat insulation fabric according to any one of Aspects 1 to 6, comprising coating a fabric having an aperture ratio of 12% or less with a coating liquid containing the tungsten-based infrared absorbing pigment to form an inner layer, and<​​Methods that include... [Effects of the Invention]

[0013] The present invention provides a laminated heat-shielding fabric for preventing infrared transmission that offers an excellent balance between concealment and heat shielding properties, and has few design limitations. The laminated heat-shielding fabric for preventing infrared transmission of the present invention can be suitably applied, for example, to clothing, particularly to sportswear, thereby preventing surreptitious photography and viewing by infrared cameras. [Brief explanation of the drawing]

[0014] [Figure 1] Figure 1 shows images of Landolt rings captured with an infrared camera through a laminated fabric. Figure 1(a) relates to Experimental Example 1-1, Figure 1(b) to Experimental Example 2-5, and Figure 1(c) to Experimental Example 2-8. [Figure 2] Figure 2 shows the UV-Vis-NIR spectra of the laminated fabrics obtained in experimental examples 1-10, 2-6, and 3-9, respectively. [Modes for carrying out the invention]

[0015] 《Laminated heat-shielding fabric to prevent infrared transmission》 The infrared transmission-preventing laminated heat-shielding fabric of the present invention is A laminated heat-shielding fabric for preventing infrared transmission, comprising an outer layer made of fabric and an infrared-absorbing inner layer made of fabric containing a tungsten-based infrared-absorbing pigment, The opening ratio of the fabric constituting the inner layer is 12% or less, and The aperture ratio of the outer layer is greater than that of the inner layer. This is a laminated heat-shielding fabric designed to prevent infrared transmission.

[0016] In this specification, "opening ratio" refers to the percentage of the total area of ​​holes relative to the total area of ​​the fabric.

[0017] The outer and inner layers constituting the infrared transmission-blocking laminated heat-shielding fabric of the present invention both have holes (spaces) that penetrate in the thickness direction of the fabric. Therefore, the infrared transmission-blocking laminated heat-shielding fabric of the present invention can effectively dissipate the heat emitted from the body and the heat emitted by the tungsten-based infrared-absorbing pigment contained in the inner layer when it absorbs infrared rays, resulting in excellent heat shielding properties.

[0018] Furthermore, the opening ratio of the fabric constituting the inner layer is limited to 12% or less. Therefore, in the infrared transmission-preventing laminated heat-shielding fabric of the present invention, infrared transmission is blocked by tungsten-based infrared-absorbing pigments in more than 88% of the area of ​​the inner layer other than the openings, resulting in excellent concealment.

[0019] The infrared-blocking laminated heat-shielding fabric of the present invention achieves both concealment and heat-shielding properties through this mechanism. However, the present invention is not bound by any particular theory.

[0020] <Outer layer> The outer layer of the infrared transmission-preventing laminated heat-shielding fabric of the present invention has holes (spaces) that penetrate in the thickness direction of the fabric.

[0021] In the outer layer, the shape of the holes that penetrate in the thickness direction of the fabric is arbitrary. The shape of the holes may be selected from circles, ellipses, sectors, polygons, star polygons (pentagrams, hexagrams, etc.), Reuleaux polygons, and combinations thereof.

[0022] It is preferable that the holes are uniformly arranged on the surface of the outer layer. Quantitatively, this means that the difference between the aperture ratio of any region of the outer layer and the aperture ratio of another region that does not overlap with this region is, for example, 5 percent points or less, 3 percent points or less, or 2 percent points or less. In this case, the size of the two regions whose aperture ratios are being compared may each contain 10 or more holes. The aperture ratio of the outer layer will be described later.

[0023] The outer layer may take any form as long as it has holes. The outer layer in the infrared transmission-blocking laminated heat-shielding fabric of the present invention may be, for example, a perforated fabric, lace fabric, mesh fabric, perforated nonwoven fabric, etc.

[0024] Perforated fabrics may include fabrics without holes that have been perforated, or fabrics with small holes that have been perforated with larger holes. Lace fabric refers to fabric in which holes form an openwork pattern, and is a concept that includes needle lace, chemical lace, filet lace, bobbin lace, etc.

[0025] In this specification, mesh fabric refers to a woven or knitted fabric with a mesh-like openwork pattern, and is a concept that includes double raschel, organza, tulle, and the like.

[0026] The fibrous material constituting the outer layer is arbitrary and may be a fabric composed of one or more materials selected from natural fibers, synthetic fibers, regenerated fibers, semi-synthetic fibers, etc.

[0027] Examples of natural fibers include cotton, linen, silk, and wool; Examples of synthetic fibers include polyester, nylon, acrylic, and urethane; Examples of regenerated fibers include cupro and rayon; Examples of semi-synthetic fibers include acetate, triacetate, etc. These can be listed individually.

[0028] The fabric may be woven, knitted, or nonwoven. The yarn used to make the fabric may be monofilament, multifilament, or a combination thereof.

[0029] The outer layer may or may not contain an infrared absorbent. In the infrared transmission-preventing laminated heat-shielding fabric of the present invention, the inner layer contains a tungsten-based infrared-absorbing pigment. Here, by limiting the aperture ratio of the inner layer to 12% or less, the infrared transmittance is sufficiently low, resulting in excellent concealment. Furthermore, by setting the aperture ratio of the outer layer to be larger than that of the inner layer, heat dissipation is high, resulting in excellent heat shielding. Therefore, from the viewpoint of both concealment and heat shielding, the outer layer does not need to contain an infrared absorbent.

[0030] The color of the fabric constituting the outer layer is arbitrary. The outer layer may be any color depending on the desired design of the garment to which the infrared transmission-preventing laminated heat-shielding fabric of the present invention is applied, and may have a specific design such as an illustration, text, or photograph.

[0031] (Outer layer aperture ratio) As described above, the outer layer of the infrared transmission-blocking laminated heat-shielding fabric of the present invention has holes (spaces) that penetrate in the thickness direction of the fabric. The presence of holes in the outer layer results in high heat-shielding properties for the infrared transmission-blocking laminated heat-shielding fabric.

[0032] The aperture ratio of the outer layer is greater than that of the inner layer. This relationship will be explained quantitatively later.

[0033] The opening ratio of the outer layer may be more than 12%, 13% or more, 15% or more, 20% or more, 25% or more, or 30% or more from the viewpoint of ensuring heat shielding, and may be 60% or less, 50% or less, 40% or less, 35% or less, 30% or less, 25% or less, or 20% or less from the viewpoint of ensuring concealment.

[0034] <Inner layer> The inner layer of the infrared transmission-preventing laminated heat-shielding fabric of the present invention is a fabric containing a tungsten-based infrared-absorbing pigment, and exhibits infrared absorption properties.

[0035] The inner layer has holes (spaces) that penetrate in the thickness direction of the fabric. The shape and arrangement of the holes in the inner layer may be appropriately selected and applied from those described above for the outer layer. The shape and arrangement of the holes in the inner layer may be the same as or different from those of the outer layer.

[0036] The form and color of the inner layer may also be appropriately selected and applied from those described above for the outer layer. Therefore, the inner layer may be, for example, perforated fabric, lace fabric, mesh fabric, perforated nonwoven fabric, etc. The color of the inner layer is arbitrary. The form and color of the inner layer may be the same as or different from those of the outer layer.

[0037] The inner layer is a fabric containing a tungsten-based infrared-absorbing pigment. The embodiment of the inner layer containing a tungsten-based infrared-absorbing pigment is arbitrary, as long as the infrared transmission-preventing laminated heat-shielding fabric of the present invention exhibits the desired concealment and heat-shielding properties.

[0038] Examples of the inner layer configurations include the following: An inner layer (first inner layer) having a structure in which a tungsten-based infrared-absorbing pigment is attached to one or both sides of a fabric composed of fibers that do not contain a tungsten-based infrared-absorbing pigment; The inner layer (second inner layer) is a fabric composed of fibers containing tungsten-based infrared-absorbing pigments. The inner layer (third inner layer) is a fabric composed of fibers containing tungsten-based infrared absorbing pigments and fibers not containing tungsten-based infrared absorbing pigments. etc.

[0039] The first to third inner layers may further contain, along with the tungsten-based infrared-absorbing pigment, any components selected from dispersants, binder resins, colorants, fillers, etc. These optional components may be derived from components in the coating solution or composition used to emulsion the tungsten-based infrared-absorbing pigment in the inner layers.

[0040] The following will explain the first to third inner layers in order.

[0041] (First inner layer) The first inner layer is an inner layer having a structure in which a tungsten-based infrared-absorbing pigment is attached to one or both sides of a fabric made of fibers that do not contain a tungsten-based infrared-absorbing pigment.

[0042] A fabric made of fibers that do not contain tungsten-based infrared-absorbing pigments may have the same form and composition as the inner layer, except that it does not contain tungsten-based infrared-absorbing pigments. Therefore, this fabric has holes (spaces) that penetrate in the thickness direction of the fabric, and its opening ratio is 12% or less. Furthermore, this fabric may be made of one or more materials selected from natural fibers, synthetic fibers, regenerated fibers, semi-synthetic fibers, etc.

[0043] The first inner layer may be manufactured, for example, by applying a coating solution containing a tungsten-based infrared-absorbing pigment to one or both sides of a fabric made of fibers that do not contain a tungsten-based infrared-absorbing pigment.

[0044] The coating solution used here contains a tungsten-based infrared absorbing pigment and may contain any components selected from solvents, dispersants, binder resins, colorants, fillers, etc.

[0045] The content of tungsten-based infrared absorbing pigment in the coating solution may be, for example, 0.1% by mass or more, 0.5% by mass or more, or 1.0% by mass or more, based on the mass of the coating solution, for example, 10.0% by mass or less, 5.0% by mass or less, 3.0% by mass or less, 12.0% by mass or less, or 1.0% by mass or less.

[0046] The solvent may be capable of dispersing the tungsten-based infrared-absorbing pigment and dissolving or dispersing other components contained in the coating solution.

[0047] Examples of solvents include alcohols such as ethanol, propanol, butanol, isopropyl alcohol, isobutyl alcohol, and diacetone alcohol; ethers such as methyl ether, ethyl ether, and propyl ether; esters such as ethyl acetate; ketones such as acetone, methyl ethyl ketone, diethyl ketone, cyclohexanone, ethyl isobutyl ketone, and methyl isobutyl ketone; aromatic hydrocarbons such as toluene, xylene, and benzene; aliphatic hydrocarbons such as n-hexane, heptane, and cyclohexane; and glycol ethers such as propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether, and ethylene glycol mono-n-propyl ether. One or more of these can be selected and used.

[0048] The solvent for the coating solution may be, for example, a mixed solvent composed of water and a water-soluble organic solvent.

[0049] The solvent content in the coating solution may be, for example, 70% by mass or more, 80% by mass or more, 85% by mass or more, 90% by mass or more, or 95% by mass or more, based on the total mass of the coating solution, and may be 99% by mass or less, 98% by mass or less, 97% by mass or less, 96% by mass or less, or 95% by mass or less.

[0050] A dispersant may be added to the coating solution to improve the dispersibility of the tungsten-based infrared-absorbing pigment in the coating solution. In the present invention, for example, a compound having a functional group such as an amino group, a hydroxyl group, a carboxyl group, or an epoxy group may be used as the dispersant.

[0051] The amount of dispersant in the coating solution may be, for example, 50 parts by mass or more, 100 parts by mass or more, 200 parts by mass or more, or 300 parts by mass or more per 100 parts by mass of tungsten-based infrared absorbing pigment, and may be, for example, 1,000 parts by mass or less, 800 parts by mass or less, or 500 parts by mass or less.

[0052] The binder resin may be appropriately selected from known binder resins contained in paints, such as polyurethane resin, fluororesin, urethane acrylate resin, acrylic resin, epoxy resin, etc.

[0053] The coating solution may be applied by any suitable method, such as spray coating, flexographic printing, letterpress printing, offset printing, intaglio printing, gravure printing, screen printing, inkjet printing, or impregnation.

[0054] <Second Inner Layer> The second inner layer is composed of fibers containing tungsten-based infrared-absorbing pigments.

[0055] The second inner layer may satisfy the requirements for an inner layer, except that it must be composed of fibers containing a tungsten-based infrared-absorbing pigment. Therefore, the second inner layer has holes (spaces) that penetrate in the thickness direction of the fabric, and its opening ratio is 12% or less.

[0056] The fibers constituting the second inner layer, which contain a tungsten-based infrared-absorbing pigment, may be manufactured, for example, by melt spinning a composition containing a tungsten-based infrared-absorbing pigment and a resin.

[0057] The composition used here may contain, in addition to tungsten-based infrared-absorbing pigments and resins, dispersants, colorants, fillers, and the like.

[0058] The content of tungsten-based infrared absorbing pigment in the composition may be, for example, 0.05% by mass or more, 0.07% by mass or more, or 0.1% by mass or more, based on the total mass of the composition, for example, 5.0% by mass or less, 3.0% by mass or less, 2.0% by mass or less, 1.0% by mass or less, 0.8% by mass or less, 0.5% by mass or less, 0.3% by mass or less, or 0.20% by mass or less.

[0059] The resin in the composition may be one or more selected from, for example, polyolefin resins, polystyrene resins, polyester resins, resins, acrylic resins, polyamide resins, polyvinyl alcohol resins, polyurethane resins, polyolefin resins, polycarbonate resins, polysulfone resins, etc., from the viewpoint of dispersibility of tungsten-based infrared absorbing pigments. The resin preferably contains one or more selected from polyester resins and polyamide resins, and in particular preferably contains one or more selected from polyethylene terephthalate homopolymer, polyethylene terephthalate copolymer, and nylon.

[0060] The resin content in the composition may be, for example, 75.0% by mass or more and 99.5% by mass or less, based on the total mass of the composition.

[0061] As a dispersant, the same dispersant as exemplified above can be used as a dispersant contained in the coating solution for producing the first inner layer. The amount of dispersant used relative to the amount of tungsten-based infrared absorbing pigment is also the same as in the case of the coating solution for producing the first inner layer.

[0062] The composition may be prepared by kneading a tungsten-based infrared-absorbing pigment, a resin, a dispersant, and other optional components at a temperature of approximately 200°C to 300°C using, for example, a batch-type kneader such as a kneader, Banbury mixer, Henschel mixer, or mixing roll; or a continuous kneader such as a twin-screw extruder or single-screw extruder.

[0063] By melt-spinning the above composition, fibers containing a tungsten-based infrared-absorbing pigment can be obtained. Melt-spinning may be carried out, for example, using a commercially available melt-spinning apparatus. The kneading for preparing the composition and the kneading for melt-spinning may be carried out as a single continuous process, or as separate processes.

[0064] The fibers that make up the second inner layer are The monofilament may contain a tungsten-based infrared absorbing pigment, A multifilament may be composed of multiple monofilaments containing a tungsten-based infrared-absorbing pigment, or, The multifilament may consist of a monofilament containing a tungsten-based infrared-absorbing pigment and a monofilament not containing a tungsten-based infrared-absorbing pigment.

[0065] The second inner layer may be a woven fabric, knitted fabric, nonwoven fabric, etc., made of the fibers described above.

[0066] (Third inner layer) The third inner layer is composed of fibers containing tungsten-based infrared absorbing pigments and fibers that do not contain tungsten-based infrared absorbing pigments.

[0067] The third inner layer may have the same form as the inner layer of the present invention, except that it satisfies the requirement that it is composed of fibers containing a tungsten-based infrared absorbing pigment and fibers not containing a tungsten-based infrared absorbing pigment. Therefore, the third inner layer has holes (spaces) that penetrate in the thickness direction of the fabric, and its opening ratio is 12% or less.

[0068] The fibers containing the tungsten-based infrared absorbing pigment in the third inner layer may be the same as the fibers containing the tungsten-based infrared absorbing pigment in the second inner layer.

[0069] The fibers in the third inner layer that do not contain tungsten-based infrared absorbing pigments may be monofilaments or multifilaments made of any material. These fibers may be made of one or more materials selected from natural fibers, synthetic fibers, regenerated fibers, semi-synthetic fibers, etc.

[0070] The third inner layer may be a woven fabric, nonwoven fabric, etc., composed of fibers containing tungsten-based infrared absorbing pigments and fibers not containing tungsten-based infrared absorbing pigments, as described above.

[0071] (Content mode of tungsten-based infrared absorbing pigment) In the inner layer of the laminated heat-insulating fabric for preventing infrared ray transmission of the present invention, a tungsten-based infrared absorbing pigment may be adhered to at least a part of the surface of the inner layer on the side opposite to the outer layer.

[0072] In the laminated heat-insulating fabric for preventing infrared ray transmission of the present invention, the tungsten-based infrared absorbing pigment may be contained in the surface of the inner layer on the outer layer side and inside the inner layer. However, in order for the laminated heat-insulating fabric for preventing infrared ray transmission to exhibit desired concealability and heat-insulating property, it is sufficient that the tungsten-based infrared absorbing pigment is adhered to at least a part of the surface of the inner layer on the side opposite to the outer layer.

[0073] Therefore, the inner layer in the laminated heat-insulating fabric for preventing infrared ray transmission of the present invention may be the above-mentioned "first inner layer", and has a structure in which a tungsten-based infrared absorbing pigment is adhered to one side of a fabric composed of fibers not containing a tungsten-based infrared absorbing pigment.

[0074] (Content of tungsten-based infrared absorbing pigment) In the laminated heat-insulating fabric for preventing infrared ray transmission of the present invention, the content ratio of the tungsten-based infrared absorbing pigment per unit area of the inner layer is 2.0 g / m 2 or more, 2.5 g / m 2 or more, 3.0 g / m 2 or more, 3.5 g / m 2 or more, or 4.0 g / m 2 or more from the viewpoint of ensuring concealability and heat-insulating property, and 8.0 g / m 2 or less, 7.0 g / m 2 or less, 6.0 g / m 2 or less, 5.0 g / m 2 or less, or 4.0 g / m 2 or less from the viewpoint of ensuring heat-insulating property.

[0075] The above content is the total content of the tungsten-based infrared absorbing pigment contained in both surfaces and inside of the inner layer.

[0076] (Tungsten-based infrared absorbing pigment) The tungsten-based infrared-absorbing pigment contained in the inner layer of the infrared-transmitting laminated heat-shielding fabric of the present invention may be close to transparent in color under visible light and have high infrared absorption capacity.

[0077] The tungsten-based infrared absorbing pigment in the inner layer of the infrared transmission-blocking laminated heat-shielding fabric of the present invention is, for example, General formula (1):M x W y O z {In the formula, M is one or more elements selected from the group consisting of H, He, alkali metals, alkaline earth metals, rare earth elements, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, and I, W is tungsten, O is oxygen, and x, y, and z are each positive numbers, 0 <x / y≦1であり、かつ2.2≦z / y≦3.0である} A composite tungsten oxide represented by, General formula (2): W y O z {In the formula, W is tungsten, O is oxygen, y and z are positive numbers, and 2.45 ≤ z / y ≤ 2.999} A tungsten oxide having a Magneli phase represented by, It may be one or more types selected from the list.

[0078] Such tungsten-based infrared absorbing pigments may be produced, for example, by a method for producing a composite tungsten oxide or a tungsten oxide having a Magneli phase, as described in Japanese Patent Application Publication No. 2005-187323.

[0079] The composite tungsten oxide represented by general formula (1) has element M added to it. Therefore, including the case where z / y = 3.0 in general formula (1), free electrons are generated, and absorption characteristics originating from free electrons appear in the near-infrared wavelength region, making it effective as a material that absorbs near-infrared light around 1,000 nm. From the viewpoint of improving the optical properties and weather resistance as a near-infrared absorbing material, element M may be one or more selected from the group consisting of Cs, Rb, K, Tl, In, Ba, Li, Ca, Sr, Fe, and Sn.

[0080] The composite tungsten oxide represented by general formula (1) may be treated with a silane coupling agent. Treatment with a silane coupling agent can enhance near-infrared absorption and transparency in the visible light wavelength region.

[0081] When the x / y value, which indicates the amount of element M added, is greater than 0, a sufficient amount of free electrons are generated, allowing the near-infrared absorption effect to be fully exhibited. Note that the more element M is added, the greater the supply of free electrons and the higher the near-infrared absorption effect; however, it usually saturates at an x / y value of around 1. When the x / y value is 1 or less, it becomes possible to prevent the formation of impurity phases in the pigment-containing layer.

[0082] The value of x / y may be 0.001 or greater, 0.2 or greater, or 0.30 or greater, and may be 0.85 or less, 0.5 or less, or 0.35 or less. In particular, the value of x / y can be 0.33.

[0083] In general formulas (1) and (2), the value of z / y indicates the level of oxygen control. In the composite tungsten oxide represented by general formula (1), if the value of z / y satisfies the relationship 2.2 ≤ z / y ≤ 3.0, the same oxygen control mechanism as in the tungsten oxide represented by general formula (2) is at work, and even when z / y = 3.0, there is a supply of free electrons due to the addition of element M. In general formula (1), the value of z / y may also be set to satisfy the relationship 2.45 ≤ z / y ≤ 3.0.

[0084] The composite tungsten oxide represented by general formula (1) preferably contains or consists of a hexagonal crystal structure. When the composite tungsten oxide represented by general formula (1) has a hexagonal crystal structure, the transmission of the pigment in the visible light wavelength region increases, and the absorption in the near-infrared light wavelength region increases. Furthermore, the cations of element M are arranged in the voids of the hexagonal crystal.

[0085] Generally, a hexagonal crystal structure is formed when an element with a large ionic radius, M, is added. Specifically, hexagonal crystals are easily formed when elements with large ionic radii such as Cs, K, Rb, Tl, In, Ba, Sn, Li, Ca, Sr, and Fe are added. However, the element M in the composite tungsten oxide represented by general formula (1) is not limited to these elements; it is sufficient for the added element M to be present in the hexagonal voids formed by the WO6 units.

[0086] When a composite tungsten oxide represented by general formula (1) having a hexagonal crystal structure has a uniform crystal structure, the amount of additive element M can be between 0.2 and 0.5 in terms of the x / y value, between 0.30 and 0.35, and especially between 0.33. When the x / y value is 0.33, it is considered that the additive element M is arranged in substantially all of the hexagonal voids.

[0087] In addition to hexagonal tungsten bronze, tetragonal or cubic tungsten bronze may also be used. The composite tungsten oxide represented by general formula (1) tends to have different absorption positions in the near-infrared wavelength region depending on the crystal structure, with the absorption position tending to shift towards longer wavelengths in the order of cubic, tetragonal, and hexagonal. Consequently, the absorption in the visible light wavelength region is lowest in the order of hexagonal, tetragonal, and cubic. Therefore, hexagonal tungsten bronze may be used in applications where it is desirable to transmit more light in the visible wavelength region and absorb more light in the near-infrared wavelength region.

[0088] In tungsten oxides having a Magnelli phase represented by general formula (2), the so-called "Magnelli phase" having a composition ratio satisfying the relationship z / y = 2.45 ≤ z / y ≤ 2.999 is a pigment with high stability and high absorption characteristics in the near-infrared wavelength region.

[0089] Composite tungsten oxides represented by general formula (1) and tungsten oxides having a Magnelli phase represented by general formula (2) absorb light in the near-infrared wavelength region, especially around 1,000 nm, so their transmitted color may range from blue to green.

[0090] The particle size of the tungsten-based infrared-absorbing pigment may be appropriately set according to the intended use of the laminated heat-shielding fabric for preventing infrared transmission of the present invention. The primary particle size of the tungsten-based infrared-absorbing pigment may be, for example, 10 nm or more or 20 nm or more, and also 50 nm or less, 40 nm or less, or 30 nm or less. Tungsten-based infrared-absorbing pigments having a primary particle size within this range exhibit high infrared absorption while maintaining high transparency in the visible light wavelength region due to minimal scattering of visible light by the particles.

[0091] The particle size of tungsten-based infrared-absorbing pigments may be measured, for example, by a scanning electron microscope.

[0092] (Opening ratio of the inner layer) The opening ratio of the inner layer of the infrared-blocking laminated heat-shielding fabric of the present invention is 12% or less. It is believed that the opacity of the infrared-blocking laminated heat-shielding fabric of the present invention is ensured by having an opening ratio of 12% or less of the inner layer. The opening ratio of the inner layer is 12% or less, and may be 10% or less, 8% or less, 6% or less, or 4% or less.

[0093] On the other hand, in order to ensure the heat shielding properties of the laminated heat-shielding fabric for preventing infrared transmission, the opening ratio of the fabric constituting the inner layer may be 2% or more, 3% or more, 4% or more, or 5% or more.

[0094] <Relationship between the opening ratio of the outer layer and the opening ratio of the inner layer> In the infrared transmission-blocking laminated heat-shielding fabric of the present invention, the aperture ratio of the outer layer is greater than that of the inner layer. By satisfying this requirement, the concealment and heat-shielding properties of the infrared transmission-blocking laminated heat-shielding fabric are ensured.

[0095] The aperture ratio of the outer layer may be 1.05 times or more, 1.5 times or more, 2.0 times or more, 4.0 times or more, or 6.0 times or more compared to the aperture ratio of the inner layer, and may be 20 times or less, 15 times or less, 10 times or less, or 8.0 times or less.

[0096] Furthermore, the sum of the opening ratio of the outer layer and the opening ratio of the inner layer may be 10% or more, 20% or more, 25% or more, 30% or more, 35% or more, or 40% or more in order to ensure sufficient heat shielding, and may be 57% or less, 55% or less, 50% or less, 45% or less, or 40% or less in order to ensure sufficient concealment.

[0097] <Lamination of outer and inner layers> The infrared transmission-preventing laminated heat-shielding fabric of the present invention is constructed by laminating an outer layer and an inner layer.

[0098] As described above, the inner layer of the infrared transmission-preventing laminated heat-shielding fabric of the present invention may have a tungsten-based infrared-absorbing pigment attached to at least a portion of the surface of the inner layer that is opposite to the outer layer. Therefore, if the tungsten-based infrared-absorbing pigment is attached to only one side surface of the inner layer, the inner layer is laminated such that the side without the tungsten-based infrared-absorbing pigment is in contact with the outer layer.

[0099] The laminated outer and inner layers may be used as is as a laminated heat-shielding fabric for preventing infrared transmission, or the surfaces of the two layers that meet may be bonded together with a suitable adhesive and used as a laminated heat-shielding fabric for preventing infrared transmission, or the two layers may be sewn together and used as a laminated heat-shielding fabric for preventing infrared transmission.

[0100] <Application of laminated heat-shielding fabric to prevent infrared transmission> The infrared-blocking laminated heat-shielding fabric of the present invention achieves both excellent opacity, making it difficult for infrared rays to pass through, and high heat dissipation properties. Therefore, the infrared-blocking laminated heat-shielding fabric of the present invention is suitable for use in clothing, particularly in sportswear.

[0101] Clothing According to another aspect of the present invention, clothing is provided that includes the infrared-blocking laminated heat-shielding fabric of the present invention. The clothing of the present invention may be, in particular, sportswear.

[0102] The garment of the present invention may consist solely of the infrared-blocking laminated heat-shielding fabric of the present invention, or it may consist of the infrared-blocking laminated heat-shielding fabric of the present invention and other fabrics.

[0103] In the garment of the present invention, the portion of the infrared-transmitting-preventing laminated heat-shielding fabric of the present invention may be configured such that the inner layer faces the wearer's body.

[0104] The clothing of the present invention may be, for example, a shirt, dress shirt, blouse, polo shirt, T-shirt, cut and sewn garment, tunic, sweatshirt, shirt dress, hoodie, vest, blouson, pants (trousers), shorts, skirt, hat, bandana, gloves, socks, etc.

[0105] Manufacturing method for laminated heat-shielding fabric that prevents infrared transmission. According to yet another aspect of the present invention, a method for manufacturing a laminated heat-shielding fabric for preventing infrared transmission is provided.

[0106] The present invention provides a method for manufacturing a laminated heat-shielding fabric that prevents infrared transmission. The process involves applying a coating solution containing a tungsten-based infrared absorbing pigment to a fabric with an opening ratio of 12% or less to form an inner layer (inner layer formation process), and Laminating an inner layer with an outer layer made of a fabric having a larger opening ratio than the inner layer (lamination process) This method includes [something].

[0107] The explanation of the "first inner layer" described above can be used for the inner layer formation process. The lamination process is described above as "lamination of the outer layer and the inner layer." [Examples]

[0108] Preparation of infrared-absorbing spray solution As an infrared absorbing pigment, 1.5 parts by mass of CWO(registered trademark) YMDS-174 (manufactured by Sumitomo Metal Mining Co., Ltd.) (Tungsten cesium oxide (Cs 0.33 An infrared-absorbing spray solution was prepared by mixing 1.0 part by mass of WO3 (hereinafter referred to as "CsWO") and 0.5 parts by mass of dispersant, 20.4 parts by mass of Watersol AC-1129 (trade name, ethylene glycol mono-n-propyl ether (EGPE) solution for acrylic resin) as the resin (corresponding to 1.8 parts by mass of acrylic resin and 18.6 parts by mass of EGPE), and 74.6 parts by mass of ethanol and 3.5 parts by mass of water as additional solvents. The primary particle size of CsWO contained in this spray solution was 20-30 nm.

[0109] Experimental Examples 1-1 to 1-10, 2-1 to 2-10, and 3-1 to 3-11 In the following examples and comparative examples, white polyester mesh fabrics with different opening ratios were used as the outer and inner layers, respectively. The infrared-absorbing spray solution prepared above was sprayed onto one side of the inner layer fabric to adhere CsWO. The amount of CsWO adhering to the inner layer was 4.0 g / m² per unit area of ​​the fabric, including the openings. 2 That's what I decided.

[0110] The outer layer and the resulting inner layer were laminated together so that the CsWO coated surface faced outwards to create a laminated fabric.

[0111] (1) Evaluation of infrared camera image concealment Four Landolt rings (C marks) with diameters of 45 mm, 23 mm, 15 mm, and 12 mm were printed on white drawing paper using black paint containing carbon. Laminated fabric was placed on these Landolt rings with the inner layer facing downwards and the CsWO coated surface facing the Landolt rings. In experimental examples 1-1, 2-1, and 3-1, an outer layer opening ratio of 100% indicates that only the inner layer was evaluated as the laminated fabric, without using the outer layer.

[0112] In this state, an infrared camera was used to capture images from above, 1,000 mm away from the fabric. The appearance of the Landolt rings in the resulting infrared camera images was examined, and the opacity was evaluated according to the following criteria. Note that the appearance in the infrared camera images was the same regardless of the diameter of the Landolt rings. A: If the Landolt ring is not visible at all B: When the outline of the Landolt ring is blurred and visible. C: When the outline of the Landolt ring is clearly visible.

[0113] The infrared camera used was a "PENTAX 645Z IR" manufactured by Ricoh Imaging Corporation, and images were taken with an IR760nm infrared filter attached.

[0114] The results are shown in Table 1. In addition, the infrared camera images from Experiment Example 1-1 (evaluation "C"), Experiment Example 2-5 (evaluation "B"), and Experiment Example 2-8 (evaluation "A") are shown in Figures 1(a) to (c), respectively.

[0115] [Table 1]

[0116] The results in Table 1 and Figure 1 show that for both the outer and inner layers, a smaller aperture ratio resulted in better concealment of the infrared camera image. However, it was verified that when the aperture ratio of the inner layer was 12% or less, the infrared camera image could be concealed by appropriately selecting the aperture ratio of the outer layer.

[0117] (2) Evaluation of infrared transmittance The laminated fabrics obtained in Experimental Examples 1-10, 2-6, and 3-9 were subjected to UV-Vis-NIR (ultraviolet-visible near-infrared) spectroscopy. The UV-Vis-NIR spectra are shown in Figure 2. The transmittance at wavelengths of 1,000 nm and 800 nm, along with the results of the infrared camera image opacity evaluation, are shown in Table 2.

[0118] [Table 2]

[0119] In Table 2, comparing Experimental Example 1-10 with Experimental Example 2-6, despite Experimental Example 2-6 having a higher infrared light transmittance, the concealment of infrared camera images was equivalent in both cases. Furthermore, comparing Experimental Example 1-10 with Experimental Example 3-9, despite having nearly identical infrared light transmittance, Experimental Example 3-9 exhibited superior concealment of infrared camera images. These findings indicate that there is no direct relationship between infrared transmittance and the concealment of infrared camera images.

[0120] Experimental Examples 1-11 and 3-12 The laminated fabrics were prepared in the same manner as in Experimental Examples 1-10 and 3-9, except that the CsWO coated surface was positioned on the inside when laminating the outer and inner layers.

[0121] (3) Evaluation of heat shielding properties The heat-shielding properties of the laminated fabrics in Experimental Examples 1-10, 3-9, 1-11, and 3-12 were evaluated as follows.

[0122] A thermocouple was sandwiched between two sheets of black drawing paper and placed on a white polystyrene foam board. The laminated fabric was positioned with the inner layer facing downwards, 10 mm away from the polystyrene foam board. In experimental examples 1-10 and 3-9, the CsWO coated surface was on the outside (bottom surface), while in experimental examples 1-11 and 3-12, it was on the inside (middle surface).

[0123] Under conditions of room temperature (24.4°C) and wind speed (0 m / s, no wind), a reflector lamp was lit from a distance of 600 mm from the top surface of the laminated fabric. The thermocouple temperature was measured immediately after ignition (0 minutes) and after 5 minutes, and the temperature rise over 5 minutes was evaluated. The illuminance on the top surface of the laminated fabric was assumed to be 4,000 lx.

[0124] The results are shown in Table 3.

[0125] [Table 3]

[0126] The results in Table 3 demonstrate that laminated fabrics in which the outer layer's aperture ratio is greater than that of the inner layer, and where the CsWO coated surface of the inner layer faces outwards, exhibit the least temperature rise under reflector lamp irradiation and demonstrate excellent heat shielding properties.

Claims

1. A laminated heat-shielding fabric for preventing infrared transmission, comprising an outer layer made of fabric and an infrared-absorbing inner layer made of fabric containing a tungsten-based infrared-absorbing pigment, The opening ratio of the fabric constituting the inner layer is 12% or less, and The aperture ratio of the outer layer is greater than that of the inner layer. Laminated heat-shielding fabric to prevent infrared transmission.

2. The laminated heat-shielding fabric for preventing infrared transmission according to claim 1, wherein a tungsten-based infrared-absorbing pigment is attached to at least a portion of the surface of the inner layer that is opposite to the outer layer.

3. The laminated heat-shielding fabric for preventing infrared transmission according to claim 1, wherein the opening ratio of the fabric constituting the inner layer is 2% or more.

4. The laminated heat-shielding fabric for preventing infrared transmission according to claim 1, wherein the sum of the opening ratio of the outer layer and the opening ratio of the inner layer is 10% or more and 57% or less.

5. The opening ratio of the inner layer is 2% or more. The sum of the opening ratio of the outer layer and the opening ratio of the inner layer is 10% or more and 57% or less, A tungsten-based infrared-absorbing pigment is attached to at least a portion of the surface of the inner layer that is opposite to the outer layer. The laminated heat-shielding fabric for preventing infrared transmission as described in claim 1.

6. The content ratio of the tungsten-based infrared absorbing pigment per unit area of ​​the inner layer is 2.0 g / m². ２ 8.0g / m or more ２ The following is a laminated heat-shielding fabric for preventing infrared transmission, as described in claim 1.

7. The tungsten-based infrared absorbing pigment is General form (1): M ｘ W ｙ O ｚ {In the formula, M is one or more elements selected from the group consisting of 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; x, y, and z are each positive numbers, 0 < x / y ≤ 1, and 2.2 ≤ z / y ≤ 3.0} A composite tungsten oxide represented by, General form (2): W ｙ O ｚ {In the formula, W is tungsten, O is oxygen, y and z are positive numbers, and 2.45 ≤ z / y ≤ 2.999} A tungsten oxide having a Magneli phase represented by, It is one or more selected from the following: A laminated heat-shielding fabric for preventing infrared transmission, as described in any one of claims 1 to 6.

8. The laminated heat-shielding fabric for preventing infrared transmission according to claim 7, wherein the primary particle size of the tungsten-based infrared-absorbing pigment is 10 nm or more and 50 nm or less.

9. A laminated heat-shielding fabric for preventing infrared transmission, as described in any one of claims 1 to 6, for use in clothing.

10. A laminated heat-shielding fabric for preventing infrared transmission, as described in claim 9, for use in sportswear.

11. Clothing comprising a laminated heat-shielding fabric for preventing infrared transmission as described in any one of claims 1 to 6.

12. The garment according to claim 11, which is a sports garment.

13. A method for manufacturing a laminated heat-shielding fabric for preventing infrared transmission, as described in any one of claims 1 to 6, To form an inner layer, a coating solution containing the tungsten-based infrared absorbing pigment is applied to a fabric with an opening ratio of 12% or less, and Laminating the aforementioned inner layer with an outer layer made of a fabric having an opening ratio greater than that of the inner layer. Methods that include...

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