Heat shielding article

Abstract

To provide a heat shielding article which exhibits heat shielding properties when irradiated with sunlight and does not impair the degree of freedom of design.SOLUTION: A heat shielding article, wherein a heat shielding agent containing a tungsten-based infrared absorbing pigment is attached to at least a part of a surface of the heat shielding article, and the heat shielding article is used for suppressing a temperature rise due to light irradiation.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a heat-shielding article, and more particularly to an article that can suppress a temperature rise when exposed to sunlight. [Background technology]

[0002] For example, in order to alleviate the heat in summer, there are known techniques for imparting heat-shielding properties to fabrics used in clothing, etc. For example, Patent Document 1 proposes an infrared-reflective, heat-shielding fabric in which a resin layer containing titanium oxide is laminated on a base fabric.

[0003] On the other hand, Patent Document 2 proposes an infrared absorbing fiber containing a specific tungsten-based oxide. Patent Document 2 explains that this infrared absorbing fiber absorbs infrared rays and exhibits a heat-retaining effect, and that the tungsten-based oxide contained therein transmits visible light and has a nearly transparent color, so that the design of the textile product is not impaired. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-200039 [Patent Document 2] Japanese Patent Application Laid-Open No. 2006-132042 Summary of the Invention [Problem to be solved by the invention]

[0005] According to the technology of Patent Document 1, the infrared reflectance of the resin layer containing titanium oxide is not very high, so the heat-shielding properties of the obtained heat-shielding fabric are insufficient. In addition, titanium oxide is white, which limits the design possibilities of textile products.

[0006] On the other hand, the infrared absorbing fiber of Patent Document 2 does not impair the design freedom of textile products because the tungsten oxide contained therein has a nearly transparent color. However, the technology of Patent Document 2 is intended for application to textile products that exhibit heat retention effects, and cannot be used for heat shielding purposes.

[0007] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heat-shielding article that exhibits heat-shielding properties when irradiated with sunlight, without impairing the degree of freedom in design. [Means for solving the problem]

[0008] The present invention is as follows.

[0009] A heat-shielding agent containing a tungsten-based infrared absorbing pigment is attached to at least a portion of the surface. Used to suppress temperature rise due to light irradiation, Heat-shielding items. <<Aspect 2>> 2. The heat-shielding article according to claim 1, wherein the heat-shielding agent is attached to at least a portion of the surface in the form of a layer. Aspect 3: The heat-shielding article according to aspect 1, wherein the heat-shielding agent comprises a resin. Aspect 4: The heat shielding article according to aspect 3, wherein the resin is one or more selected from the group consisting of acrylic resin, polyester resin, urethane resin, epoxy resin, and vinyl chloride resin. Aspect 5 The content of the tungsten-based infrared absorbing pigment per area of ​​the heat-shielding agent is 0.4 g / m 2 More than 1.2g / m 2 A heat shielding article according to aspect 1, wherein: Aspect 6: The content of the tungsten-based infrared absorbing pigment per area of ​​the heat-shielding agent is 0.4 g / m 2 More than 1.2g / m 2 A heat shielding article according to aspect 3, wherein: Aspect 7: The tungsten-based infrared absorbing pigment is General formula (1):M x Wy 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 each positive numbers; and 0 is an integer of 0 or more. <x / y≦1であり、かつ2.2≦z / y≦3.0である} A composite tungsten oxide represented by the formula: General formula (2): W y O z {wherein W is tungsten, O is oxygen, y and z are each positive numbers, and 2.45≦z / y≦2.999} Tungsten oxide having a Magneli phase represented by One or more selected from A heat shield article according to any one of aspects 1 to 6. Aspect 8: The heat shield article according to any one of Aspects 1 to 6, wherein the tungsten-based infrared absorbing pigment has a primary particle size of 10 nm or more and 50 nm or less. Aspect 9: The heat-shielding article according to any one of Aspects 1 to 6, which is a sunshade fabric product or a sunshade film product. Aspect 10: A method for producing the heat shielding article according to any one of aspects 1 to 6, comprising: and applying a coating liquid containing the tungsten-based infrared absorbing pigment to an article. method. Aspect 11: The method according to aspect 10, wherein the coating liquid further contains a resin. [Effects of the Invention]

[0010] According to the present invention, a heat-shielding article is provided which has heat-shielding properties and does not impair freedom of design. DETAILED DESCRIPTION OF THE INVENTION

[0011] The heat shielding article of the present invention comprises: A heat-shielding agent containing a tungsten-based infrared absorbing pigment is attached to at least a part of the surface, and Used to suppress temperature rise due to light irradiation, It is a heat-shielding item.

[0012] Heat shielding agent The heat-shielding agent in the heat-shielding article of the present invention contains a tungsten-based infrared-absorbing pigment, and may also contain a resin and other optional components.

[0013] In the heat-shielding article of the present invention, it is sufficient that the heat-shielding agent is attached to at least a portion of the surface of the article. The heat-shielding agent may be attached to the entire surface of the article in the form of a layer, or may be attached to a portion of the surface of the article in the form of a layer. Even if the heat-shielding agent is attached to the surface of the article in the form of a collection of small dots, the article still falls under the category of the heat-shielding article of the present invention.

[0014] As will be described later, the heat-shielding article of the present invention can be used as a sunshade article, such as a sunshade fabric product or a sunshade film product. When the heat-shielding article of the present invention is a sunshade article, the heat-shielding agent may be attached to a surface of the article that is not exposed to sunlight. In this case, the heat-shielding agent does not need to be attached to a surface that is exposed to sunlight.

[0015] <Tungsten-based infrared absorbing pigment> The heat-shielding agent in the heat-shielding article of the present invention contains a tungsten-based infrared-absorbing pigment.

[0016] The tungsten-based infrared absorbing pigment contained in the heat shielding article of the present invention may be one that is nearly transparent in color under visible light and has high infrared absorbing ability.

[0017] The tungsten-based infrared absorbing pigment of the present invention is, for example, General formula (1):M x W y Oz 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 each positive numbers; and 0 is an integer of 0 or more. <x / y≦1であり、かつ2.2≦z / y≦3.0である} A composite tungsten oxide represented by the formula: General formula (2): W y O z {wherein W is tungsten, O is oxygen, y and z are each positive numbers, and 2.45≦z / y≦2.999} Tungsten oxide having a Magneli phase represented by It may be one or more selected from the following.

[0018] Such tungsten-based infrared absorbing pigments may be produced, for example, by the method for producing composite tungsten oxide or tungsten oxide having a Magneli phase, which is described in JP-A-2005-187323.

[0019] The composite tungsten oxide represented by general formula (1) contains an element M. Therefore, free electrons are generated, even when z / y = 3.0 in general formula (1), and absorption characteristics derived from the free electrons are exhibited in the near-infrared wavelength region, making the material effective as a material that absorbs near-infrared rays with a wavelength of around 1,000 nm. From the viewpoint of improving the optical properties and weather resistance of the near-infrared absorbing material, the element M may be one or more elements selected from the group consisting of Cs, Rb, K, Tl, In, Ba, Li, Ca, Sr, Fe, and Sn.

[0020] The composite tungsten oxide represented by general formula (1) may be treated with a silane coupling agent, which can improve near-infrared absorption and transparency in the visible light wavelength region.

[0021] When the value of x / y, which indicates the amount of element M added, is greater than 0, a sufficient number of free electrons are generated, enabling the near-infrared absorption effect to be fully exerted. Note that the greater the amount of element M added, the greater the supply of free electrons and the greater the near-infrared absorption effect, but typically the value of x / y saturates at around 1. When the value of x / y is 1 or less, it is possible to prevent the formation of an impurity phase in the pigment-containing layer.

[0022] The value of x / y may be 0.001 or more, 0.2 or more, or 0.30 or more, or may be 0.85 or less, 0.5 or less, or 0.35 or less. The value of x / y may in particular be 0.33.

[0023] In general formulas (1) and (2), the value of z / y indicates the level of oxygen content control. In the composite tungsten oxide represented by general formula (1), when 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) works, and even when z / y = 3.0, free electrons are supplied by the addition of element M. In general formula (1), the value of z / y may also satisfy the relationship 2.45≦z / y≦3.0.

[0024] The composite tungsten oxide represented by general formula (1) preferably includes or consists of a hexagonal crystal structure. When the composite tungsten oxide represented by general formula (1) has a hexagonal crystal structure, the pigment exhibits high transmittance in the visible light wavelength region and high absorption in the near-infrared light wavelength region. Furthermore, the cations of element M are arranged in the voids of the hexagonal crystal.

[0025] In general, when an element M with a large ionic radius is added, a hexagonal crystal is formed. Specifically, when an element with a large ionic radius such as Cs, K, Rb, Tl, In, Ba, Sn, Li, Ca, Sr, or Fe is added, a hexagonal crystal is easily formed. However, the element M in the composite tungsten oxide represented by general formula (1) is not limited to these elements, and it is sufficient that the added element M is present in the hexagonal voids formed by the WO6 units.

[0026] When the composite tungsten oxide having a hexagonal crystal structure and represented by general formula (1) has a uniform crystal structure, the amount of the additive element M added can be such that the value of x / y is 0.2 or more and 0.5 or less, or 0.30 or more and 0.35 or less, and particularly 0.33. When the value of x / y is 0.33, it is believed that the additive element M is arranged in substantially all of the hexagonal voids.

[0027] In addition to the hexagonal crystal structure, tetragonal or cubic tungsten bronze may also be used. The composite tungsten oxide represented by general formula (1) tends to have a change in the absorption position in the near-infrared wavelength region depending on the crystal structure, with the absorption position tending to shift toward longer wavelengths in the order of cubic, tetragonal, and hexagonal. Additionally, the order of crystal structure with the lowest absorption in the visible wavelength region is hexagonal, tetragonal, and cubic. Therefore, hexagonal tungsten bronze may be used when applications require greater transmission of light in the visible wavelength region and greater absorption of light in the near-infrared wavelength region.

[0028] In tungsten oxides having a Magneli phase represented by general formula (2), the so-called "Magneli phase" has a composition ratio where the value of z / y satisfies the relationship 2.45≦z / y≦2.999, and is a pigment that is highly stable and has high absorption characteristics in the near-infrared wavelength region.

[0029] The composite tungsten oxide represented by general formula (1) and the tungsten oxide having the Magneli phase represented by general formula (2) significantly absorb light in the near-infrared wavelength region, particularly light with a wavelength around 1,000 nm, and therefore the transmitted color tone may be blue to green.

[0030] The tungsten-based infrared absorbing pigment may be in the form of particles, and the particle size may be appropriately set depending on the intended use of the heat-shielding fabric of the present invention.

[0031] If the particle size of the tungsten-based infrared-absorbing pigment is 2,000 nm or less as the volume-average primary particle size measured with a scanning electron microscope, the difference between the peak of transmittance (reflectance) in the visible light wavelength range and the bottom of absorption in the near-infrared wavelength range will be large, resulting in a printed portion that is transparent in the visible light wavelength range.If the primary particle size of the tungsten-based infrared-absorbing pigment is 200 nm or less, 100 nm or less, 50 nm or less, or 30 nm or less, scattering of visible light by the particles can be reduced, resulting in a heat-shielding fabric that is highly transparent in the visible light wavelength range.

[0032] On the other hand, if the primary particle diameter of the tungsten-based infrared absorbing pigment is 1 nm or more, 3 nm or more, 5 nm or more, 10 nm or more, or 20 nm or more, industrial production becomes easy and sufficiently high infrared absorbency can be obtained.

[0033] The primary particle size of the tungsten-based infrared absorbing pigment may typically be, for example, 10 nm or more and 50 nm or less.

[0034] The content of the tungsten-based infrared absorbing pigment in the heat-shielding article of the present invention is 0.4 g / m as the content ratio of the tungsten-based infrared absorbing pigment per area of ​​the heat-shielding agent, from the viewpoint of ensuring an effective infrared absorbing effect. 2 More than 0.5g / m 2 More than 0.6g / m 2 More than 0.7g / m 2 More than 0.8g / m 2 or more, or 1.0 g / m 2or more. On the other hand, even if the content of the tungsten-based infrared absorbing pigment is excessively increased, the heat-shielding effect of the article does not increase indefinitely. Furthermore, if an excessive amount of the tungsten-based infrared absorbing pigment is blended, a large heat-generating effect is exhibited upon absorbing infrared rays, and the heat-shielding properties may be impaired. From this viewpoint, the content of the tungsten-based infrared absorbing pigment is set to 1.2 g / m as the content ratio of the tungsten-based infrared absorbing pigment per area of ​​the heat-shielding agent. 2 Less than or equal to 1.0 g / m 2 Below, 0.8g / m 2 Below, 0.7g / m 2 or less, or 0.6 g / m 2 It may be the following:

[0035] The content of the tungsten-based infrared absorbing pigment in the heat-shielding article of the present invention is typically 0.4 g / m as the content ratio of the tungsten-based infrared absorbing pigment per area of ​​the heat-shielding agent. 2 More than 1.2g / m 2 It may be the following:

[0036] In addition, when the heat-shielding article of the present invention has a front and a back surface, such as a parasol, a tarp, a tent, a hat, a sunshade, a curtain, a blind, a hood, a dustproof net, clothing, a light-shielding film, etc., and the heat-shielding agent is attached to both the front and the back surface, the content of the tungsten-based infrared-absorbing pigment may be evaluated separately for each region of the heat-shielding agent, with the front surface being the front heat-shielding agent and the back surface being the back heat-shielding agent. The same applies to the content of the resin described below.

[0037] <resin> The heat-shielding agent in the heat-shielding article of the present invention may contain a resin.

[0038] The resin in the heat-shielding agent may be, for example, one or more types selected from polyolefin resins, polystyrene resins, polyester resins, resins, acrylic resins, polyamide resins, polyvinyl alcohol resins, polyurethane resins, polyolefin resins, polycarbonate resins, polysulfone resins, etc. The resin may particularly be one or more types selected from acrylic resins, polyester resins, urethane resins, epoxy resins, and vinyl chloride resins.

[0039] From the viewpoint of ensuring the effect of binding the tungsten-based infrared absorbing pigment to the surface of the article, the content of the resin in the heat-shielding agent may be, for example, 50 parts by mass or more, 70 parts by mass or more, 100 parts by mass or more, 120 parts by mass or more, 150 parts by mass or more, or 170 parts by mass or more, relative to 100 parts by mass of the tungsten-based infrared absorbing pigment. On the other hand, from the viewpoint of not excessively inhibiting the effect of the tungsten-based infrared absorbing pigment, the content of the resin in the heat-shielding agent may be, for example, 400 parts by mass or less, 350 parts by mass or less, 300 parts by mass or less, 280 parts by mass or less, 250 parts by mass or less, 230 parts by mass or less, or 200 parts by mass or less, relative to 100 parts by mass of the tungsten-based infrared absorbing pigment.

[0040] <Optional ingredients> The heat-shielding agent in the heat-shielding article of the present invention contains a tungsten-based infrared-absorbing pigment and may contain a resin, but may also contain other optional components such as a dispersant, a colorant, a filler, etc., and may contain one or more selected from these.

[0041] The dispersant may be added to enhance the dispersibility of the tungsten-based infrared absorbing pigment in the heat-shielding agent. As the dispersant 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.

[0042] The content of the dispersant in the heat-shielding agent may be, for example, 10 parts by mass or more, 20 parts by mass or more, 30 parts by mass or more, or 40 parts by mass or more, relative to 100 parts by mass of the tungsten-based infrared-absorbing pigment, and may be, for example, 100 parts by mass or less, 80 parts by mass or less, or 60 parts by mass or less.

[0043] <Uses of heat-shielding articles> The heat-shielding article of the present invention exhibits excellent heat-shielding properties when exposed to sunlight. Quantitatively, the heat-shielding article of the present invention can exhibit an index of 35 or more in the heat-shielding index test prescribed by the Japan Umbrella Promotion Council, and meets the standards for displaying the "heat and light-shielding mark" certified by the council.

[0044] Therefore, the heat-shielding article of the present invention is suitably used as, for example, a sunshade fabric product, a sunshade film product, and the like.

[0045] The sunshade fabric product may be, for example, a parasol, a parasol, a tarp, a tent, a hat, a sunshade, a curtain, a blind, a hood, a dust net, clothing, an agricultural material, a fishing material, etc. The film product may be, for example, a light-blocking film, etc.

[0046] <<Method for manufacturing heat-shielding article>> The heat shielding article of the present invention may be produced by any method.

[0047] The heat shielding article of the present invention may be produced, for example, by a method comprising applying a coating liquid containing a tungsten-based infrared absorbing pigment to the article. This coating liquid may further contain a resin.

[0048] <Coating liquid> The coating liquid used in the production of the heat shielding article of the present invention contains a tungsten-based infrared absorbing pigment and may contain a resin, and may also contain other optional components such as a solvent, a dispersant, a colorant, a filler, etc., and may contain one or more selected from these.

[0049] The types of tungsten-based infrared absorbing pigment and resin contained in the coating liquid and the blending ratio of the two may be appropriately set depending on the types and blending ratios of the tungsten-based infrared absorbing pigment and resin desired in the surface layer of the heat-shielding article.

[0050] The coating liquid may be prepared as a liquid composition containing a solvent. The solvent may be capable of dispersing the tungsten-based infrared absorbing pigment and dissolving or dispersing other components contained in the coating liquid.

[0051] Examples of such 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 normal 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 solvents selected from these may be used.

[0052] The solvent for the coating liquid may be, for example, a mixed solvent composed of water and a water-soluble organic solvent.

[0053] The content of the solvent in the coating liquid 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, 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, based on the total mass of the coating liquid.

[0054] The dispersant may be blended into the coating liquid to improve the dispersibility of the tungsten-based infrared absorbing pigment in the coating liquid. The type and amount of the dispersant in the coating liquid may be appropriately set depending on the type and blending ratio of the desired dispersant in the surface layer of the heat-shielding article. Note that a dispersant that has a dispersing effect for the tungsten-based infrared absorbing pigment in the surface layer also has a dispersing effect for the tungsten-based infrared absorbing pigment in the coating liquid.

[0055] The coating liquid 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 application by impregnation. [Example]

[0056] <<Preparation of infrared absorbing spray liquid>> As an infrared absorbing pigment, 1.5 parts by mass of CWO (registered trademark) YMDS-174 (manufactured by Sumitomo Metal Mining Co., Ltd.) (cesium tungsten oxide (Cs 0.33 An infrared-absorbing spray liquid was prepared by mixing 1.0 part by mass of cesium tungsten oxide (hereinafter referred to as "CsWO") and 0.5 parts by mass of dispersant, 20.4 parts by mass of Watersol AC-1129 (trade name, acrylic resin ethylene glycol mono-n-propyl ether (EGPE) solution) as a resin (equivalent 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 the cesium tungsten oxide contained in this spray liquid was 20 to 30 nm.

[0057] A comparative spray liquid was also prepared in the same manner as above, except that no infrared absorbing pigment was added.

[0058] <<Experimental example on heat-shielding performance>> We prepared 20 light blue and 20 beige parasols of the same type, each with a rib length of 55 cm.

[0059] <Experimental Example 0-1> In Experimental Example 0-1, one light blue parasol was used as is to evaluate the heat shielding properties.

[0060] <Experimental Examples 1-1 to 1-6> In Experimental Examples 1-1 to 1-6, the spray liquid was applied to the inside surface of a light blue parasol, and the heat-shielding properties were evaluated. Specifically, the following operations were performed.

[0061] In Experimental Example 1-1, the comparative spray liquid prepared above was applied to the inside surface of a light blue parasol to form a layer. In Experimental Examples 1-2 to 1-6, the infrared absorbing spray liquid prepared above was applied to the inside surface of a light blue parasol so that the CsWO coating amount was as shown in Table 1, and the heat-shielding agent was applied in a layer to evaluate the heat-shielding properties.

[0062] <Experimental Examples 2-1 to 2-6> In Experimental Examples 2-1 to 2-6, the spray liquid was applied to the outer surface of a light blue parasol, and the heat-shielding properties were evaluated. Specifically, the following operations were performed.

[0063] In Experimental Example 2-1, the comparative spray liquid prepared above was applied to the outer surface of a light blue parasol to form a layer. In Experimental Examples 2-2 to 2-6, the infrared absorbing spray liquid prepared above was applied to the outer surface of a light blue parasol in the amount of CsWO shown in Table 1, and the heat-shielding agent was applied in a layer to evaluate the heat-shielding properties.

[0064] <Experimental Examples 3-1 to 3-6> In Experimental Examples 3-1 to 3-6, the spray liquid was applied to both the inside and outside of a light blue parasol, and the heat-shielding properties were evaluated. Specifically, the following operations were performed.

[0065] In Experimental Example 3-1, the comparative spray liquid prepared above was applied to both the inside and outside of a light blue parasol to form a layer. In Experimental Examples 3-2 to 3-6, the infrared absorbing spray liquid prepared above was applied to both the inside and outside of a light blue parasol in the amount of CsWO shown in Table 1, and the heat-shielding agent was applied in a layer to evaluate the heat-shielding properties.

[0066] <Experimental Example 4-1> In Experimental Example 4-1, an infrared absorbing spray liquid was prepared using carbon black (CB) as the infrared absorbing pigment, and the liquid was applied to the inside surface of a light blue parasol to evaluate its heat-shielding properties. Specifically, the following procedures were performed.

[0067] An infrared-absorbing spray liquid was prepared by mixing 8.0 parts by mass of carbon black as the infrared-absorbing pigment, 1.3 parts by mass of a dispersant, 14.6 parts by mass of Watersol AC-1129 (trade name, acrylic resin ethylene glycol mono-n-propyl ether (EGPE) solution) as the resin (equivalent to 7.0 parts by mass of acrylic resin and 7.6 parts by mass of EGPE), and 14.7 parts by mass of ethanol, 1.3 parts by mass of propylene glycol, and 60.1 parts by mass of water as additional solvents.

[0068] The infrared absorbing spray liquid prepared above was applied to the inside surface of a light blue parasol with a coating amount of carbon black of 0.72 g / m 2 The coating was applied so that the coating was adhered in layers, and the heat-shielding properties were evaluated.

[0069] <Evaluation of heat insulation> A reflector lamp was installed on top of a torso-type mannequin (white) with a head made by Tomane Co., Ltd. When the reflector lamp was turned on, the illuminance on the top of the mannequin's head was 3,900 lx.

[0070] A thermocouple sandwiched between two pieces of 0.286 mm thick black construction paper cut into a 60 mm x 60 mm rectangle was attached to the top of the mannequin's head.

[0071] The parasol obtained in each experimental example was placed on top of a mannequin. The distance from the top of the mannequin's head to the top of the parasol's fabric was 17 cm. A spot air conditioner manufactured by Trusco Nakayama Corporation was used to blow air at a speed of 2 m / s from the front of the mannequin onto the top of the mannequin's head and the center of the parasol's fabric.

[0072] In this state, the reflector lamp was turned on, and the temperature (thermocouple temperature) of the top of the mannequin's head was measured when the lamp was turned on and 10 minutes after the lamp was turned on. The heat shielding rate was calculated using the following formula (1). The results are shown in Table 1. Heat shielding rate (%) = {(△Tb - △Ts) / △Tb} × 100 (1) (In formula (1), △Tb is the temperature rise (℃) on the top of the mannequin's head under the spray-coated parasol 10 minutes after the reflector lamp is turned on, and ΔTs is the temperature rise (℃) on the top of the mannequin's head under the uncoated parasol 10 minutes after the reflector lamp is turned on.)

[0073] The "heat shielding rate" calculated by the above formula (1) is a numerical value equivalent to the "heat shielding index" specified by the Japan Western Umbrella Promotion Council, and if this value is 35% or more (heat shielding index 35 or more), it meets the display standards for the "heat and light shielding mark" certified by the same council.

[0074] <Experimental Example 0-2> The heat shielding property was evaluated in the same manner as in Experimental Example 0-1, except that a beige parasol was used instead of the light blue parasol.

[0075] <Experimental Examples 5-1 to 5-6, 6-1 to 6-6, 7-1 to 7-6, and 8-1> Except for using a beige parasol instead of the light blue one, the spray coating was carried out on the parasol in the same manner as in Experimental Examples 1-1 to 1-6, 2-1 to 2-6, 3-1 to 3-6, and 4-1, and the heat-shielding properties were evaluated.

[0076] The results are shown in Table 2.

[0077] [Table 1]

[0078] [Table 2]

[0079] From Tables 1 and 2, the following can be understood.

[0080] Parasols coated with a spray liquid containing the infrared-absorbing pigment specified in the present invention and having a layer of light-blocking agent attached to them had a positive heat-blocking rate compared to uncoated parasols, proving that they have heat-blocking performance. When compared at the same coating amount, the order of the degree of heat-blocking performance was double-coated parasols, followed by those coated on the inside and outside, and finally those coated on the outside. In addition, when the coating amount of infrared-absorbing pigment per unit area of ​​the parasol (total coating amount on the inside and outside in the case of double-coated parasols) was 0.4 g / m 2 More than 1.2g / m 2 Within the following range, in particular 0.5 g / m 2 More than 0.9g / m 2 It was found that in the following cases, it exhibits particularly excellent heat-shielding performance with a heat-shielding rate of 35% or more.

[0081] In contrast, the parasols of Experimental Examples 4-1 and 8-1, in which a spray liquid containing carbon black as an infrared-absorbing pigment was applied to the inside surface, had inferior heat-shielding performance compared to the parasols of Experimental Examples 1-4 and 5-4, in which a spray liquid containing the infrared-absorbing pigment specified in the present invention was applied to the inside surface and contained the same amount of infrared-absorbing pigment.

[0082] <<Experimental example regarding design>> Using the parasols obtained in the above Experimental Examples 0-1, 1-4, 2-4, 3-4, and 4-1, the change in the color tone of the light blue umbrella fabric due to the application of the infrared absorbing pigment was investigated.

[0083] Three sheets of white construction paper were placed on a flat surface, and the parasol was placed on top of them with the outer surface facing upward. Using a spectrophotometer "SpectroEye" manufactured by X-Rite Inc., the L of the outer surface of the parasol was measured with a D65 light source and a field of view of 2°. * a * b * The values ​​were measured, and the color difference ΔE from the uncoated product was calculated.

[0084] In addition, the change in color tone of the beige umbrella fabric due to the application of the infrared absorbing pigment was investigated in the same manner as above, except that the parasols obtained in Experimental Examples 0-2, 5-4, 6-4, 7-4, and 8-1 were used.

[0085] The results are shown in Table 3.

[0086] [Table 3]

[0087] With reference to Table 3, the following can be seen:

[0088] The parasols of Experimental Examples 4-1 and 8-1, which were coated with a spray liquid containing carbon black as an infrared absorbing pigment, had a large color difference ΔE compared to the uncoated product.

[0089] In contrast, when the infrared absorbing pigment of the present invention was used, the color difference ΔE between all coated products and uncoated products was small, and it was verified that the color difference of the inner coated products was particularly small.

Claims

1. A heat-shielding agent containing a tungsten-based infrared absorbing pigment is attached to at least a part of the surface, and Used to suppress temperature rise due to light irradiation, Heat-shielding items.

2. The heat-shielding article according to claim 1 , wherein the heat-shielding agent is attached to at least a portion of the surface in the form of a layer.

3. The heat-shielding article according to claim 1 , wherein the heat-shielding agent comprises a resin.

4. 4. The heat shield article according to claim 3, wherein the resin is one or more resins selected from the group consisting of acrylic resins, polyester resins, urethane resins, epoxy resins, and vinyl chloride resins.

5. The content of the tungsten-based infrared absorbing pigment per area of ​​the heat-shielding agent is 0.4 g / m ２ 1.2g / m or more ２ The heat shield article according to claim 1, wherein:

6. The content of the tungsten-based infrared absorbing pigment per area of ​​the heat-shielding agent is 0.4 g / m ２ 1.2g / m or more ２ The heat shield article according to claim 3, wherein:

7. The tungsten-based infrared absorbing pigment is General form (1): M ｘ W ｙ O ｚ In the formula, M represents one or more elements selected from the group consisting of H, He, an alkali metal element, an alkaline earth metal element, a rare earth element, 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 represents tungsten; O represents oxygen; and x, y, and z each represent a positive number, 0<x / y≦1, and 2.2≦z / y≦3.

0. A composite tungsten oxide represented by the formula: General form (2): W ｙ O ｚ {wherein W is tungsten, O is oxygen, y and z are each positive numbers, and 2.45≦z / y≦2.999} Tungsten oxide having a Magneli phase represented by One or more selected from The heat shield article according to any one of claims 1 to 6.

8. The heat shield article according to any one of claims 1 to 6, wherein the tungsten-based infrared absorbing pigment has a primary particle size of 10 nm or more and 50 nm or less.

9. The heat-shielding article according to any one of claims 1 to 6, which is a sunshade fabric product or a sunshade film product.

10. A method for producing the heat shielding article according to any one of claims 1 to 6, comprising: and applying a coating liquid containing the tungsten-based infrared absorbing pigment to an article. method.

11. The method of claim 10 , wherein the coating fluid further comprises a resin.

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