Heat insulating water permeable artificial turf

Abstract

To provide an artificial turf having a water-permeable function and a heat-insulating property for competitive sports, and having a hue close to that of natural turf.SOLUTION: A heat insulating water permeable artificial turf has a pile tuft layer with thermoplastic resin grass blades planted on one side of an open-weave fabric base material, a permeable resin layer that fixes the planting area of the grass blades, covers the back surface of the pile tuft layer, and maintains the open mesh of the open mesh fabric base material, and a thermoplastic resin under pad layer in contact with the permeable resin layer, at least. The grass blades contain at least a near-infrared reflective metal oxide and a pigment, and the under pad layer has any drainage structure of (1) structure having a large number of through-holes in the thickness direction and a water-permeable resin layer exposed through the through-holes, (2) structure formed of a large number of island-shaped dots and having a water-permeable resin layer exposed between the island-shaped dots, (3) structure composed of stripes in which a permeable resin layer is exposed between the stripes, and (4) bird's nest structure in a three-dimensional space adhered by random three-dimensional stacking of mono-filaments.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to artificial turf, and particularly to heat-insulating artificial turf having water permeability.

Background Art

[0002] Artificial turf is generally made by implanting synthetic resin piles imitating grass leaves on a base fabric and fixing the synthetic resin piles by processing the back surface with a backing resin. Particularly for sports arenas such as soccer fields, baseball fields, rugby fields, American football fields, tennis courts, golf short courses, pitch and putt golf, futsal courts, etc., the mainstream is a composite with an underpad layer in this specification. Depending on the sport, the material of the pile (such as polyethylene, polypropylene, polyamide, etc.), pile length, implantation density, presence or absence of sand filling, and further the material of the underpad layer (such as polyurethane, vinyl chloride resin, vinylidene fluoride rubber, etc.), thickness, cushioning property (degree of foaming), water permeability, etc. are set. Other than for these sports, it is widely used for slope greening and weed prevention along railway tracks, slope greening and weed prevention for artificial reservoirs, greening of building rooftops, verandas, terraces, multi-purpose space flooring in commercial facilities, flooring for theme parks and event venues, flooring for exhibitions of automobiles, motorcycles, etc., flooring for pets, etc. Particularly for outdoor applications, artificial turf having a rainwater drainage function and a drainage ground system are used.

[0003] Thus, artificial turf mainly consists of thermoplastic resins such as synthetic resin piles, backing resin processing, and underpad layers, with a total thickness of 1 to 3 cm. When such artificial turf accumulates heat under the scorching sun and once reaches 50 to 70 °C, there is a potential problem that the temperature will not drop unless sunset occurs, which poses risks of physical exhaustion of players and heatstroke due to the recent intense heat in sports competitions. Therefore, as a measure to lower the heat storage temperature as much as possible, a heat-insulating artificial turf (Patent Document 1) has been proposed, which attaches a material with a high reflectivity to radiant heat, such as aluminum foil, to the ground surface side of the base fabric where the piles are planted. However, the heat-insulating artificial turf of the invention in Patent Document 1 has a drawback that rainwater that has penetrated during outdoor use corrodes the aluminum foil and turns it into aluminum oxide, thus impairing the reflection effect of radiant heat in a short period. Also, an invention of a filler for artificial turf (Patent Document 2) is disclosed, which includes a main material and a hydrophilic silica-containing substance, and further includes a green or brown heat-insulating pigment. Although this filler is suitable for artificial turf with a low planting density of turf blades and exposed ground and can exhibit a heat-insulating effect, in artificial turf with a high density of turf blades, it may not be able to obtain a sufficient heat-insulating effect because it is concealed by the turf blades. Also, an invention of a heat-insulating artificial turf (Patent Document 3) is disclosed, which contains an oxide that reflects light in the near-infrared wavelength region, such as Fe 2 O 3 and Cr 2 O 3 in the pile, and contains an oxide that reflects light in the near-infrared wavelength region, such as Fe 2 O 3 and Cr 2 O 3 , and a hollow substance made of ceramic in the resin layer. However, the color of the turf blade pile containing Fe 2 O 3 (brown) is far from the color of natural turf, and like the filler in Patent Document 2, the planting density of the turf blade pile is low to the extent that the underlying resin layer is exposed, and it lacks a grassy feeling.

[0004] On the other hand, regarding the rainwater drainage mechanism for outdoor use, a method for manufacturing a permeable artificial turf tile (Patent Document 4) has been proposed, in which heat pins are passed through from the back surface of the laminate to the artificial turf body, and apertures communicating with the artificial turf body and the drainage deck are formed to form a permeable structure. In the case of a permeable artificial turf tile with a square planar shape of 300 to 350 mm, it is described that about 50 to 400 circular holes with a diameter of 1.5 to 3 mm are drilled at one time. However, for example, in the case of an artificial turf body with a width of 2.1 m and a length of 35 m, it is necessary to repeat the drilling operation 600 times in total, 6 times in the width direction and 100 times in the length direction, which is an extremely inefficient method. In addition, a permeable artificial turf (Patent Document 5) has been proposed, which consists of a permeable base material in which elastic body chips are partially contacted to form gaps where non-contact portions communicate, and the chips are bonded in a plate shape with an adhesive on the chip surface, and a permeable turf-like surface material adhered to one side of the base material. However, the drainage mechanism based on the fine gaps between the elastic body chips is not suitable for draining heavy rain. Further, in the invention of a permeable artificial turf (Patent Document 6) including an artificial turf having a water permeable function, a cushion layer having voids, and a perforated low melting point sheet for adhesively fixing the artificial turf and the cushion layer, the perforated low melting point sheet is melted and adhesively bonded in a dot shape between the artificial turf and the cushion layer to obtain water permeability. However, the dot bonding under the scorching sun becomes fragile and is not suitable for artificial turf for intense sports competitions. Therefore, an artificial turf having a water permeable function and further having heat insulating properties and being similar in hue to natural turf is desired.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

[0006] The problem to be solved in the present invention is to provide an artificial turf for sports competitions such as soccer fields, baseball fields, rugby fields, American football fields, tennis courts, golf short courses, pitch and putt golf, futsal courts, etc., which has a water permeable function, further has heat insulating properties, and moreover has an artificial turf close to the hue of natural turf. In the present invention, the heat insulating property is an effect of reducing the body temperature of a person on the artificial turf by lowering the heat storage temperature of the artificial turf by several degrees. [Means for Solving the Problems]

[0007] As a result of repeated considerations and studies in view of such points, a pile tuft layer having turf blades made of a thermoplastic resin implanted on one side and the entire surface of an open-weave fabric base material, a water-permeable resin layer that fixes the implantation part of the turf blades, impregnates and coats the back surface of the pile tuft layer, and holds the openings of the open-weave fabric base material, and a thermoplastic resin underpad layer provided in contact with this water-permeable resin layer. The present invention has been completed by finding that an artificial turf having a water permeable function and heat insulating properties can be obtained by having at least three layers of a laminate, wherein the turf blades contain at least a near-infrared reflective metal oxide and a pigment, and the thermoplastic resin underpad layer has any one of the following drainage structures: 1) a structure having a large number of through holes in the thickness direction and the water-permeable resin layer being exposed through these through holes; 2) a structure composed of a large number of island-shaped dots and the water-permeable resin layer being exposed between these island-shaped dots; 3) a structure composed of stripes and the water-permeable resin layer being exposed between these stripes; 4) a bird's nest structure having a three-dimensional space irregularly adhered in the thickness direction by random volume overlapping of thermoplastic resin monofilaments.

[0008] The heat-insulating and water-permeable artificial turf of the present invention is such that the near-infrared reflective metal oxide is at least one selected from cobalt-aluminum composite oxide, cobalt-aluminum-chromium composite oxide, cobalt-aluminum-magnesium composite oxide, cobalt-aluminum-zinc composite oxide, cobalt-tin composite oxide, cobalt-nickel-zinc composite oxide, cobalt-nickel-titanium-zinc composite oxide, cobalt-zinc-magnesium composite oxide, cobalt-zinc-chromium-titanium composite oxide, cobalt-zinc-nickel-titanium composite oxide, and the pigment is at least one selected from phthalocyanine blue (α-type or β-type), anthraquinone blue, cobalt blue, ultramarine, dioxazine violet, quinacridone violet, indanthrene blue, indigo blue, perylene blue, phthalocyanine green, monoazo yellow, disazo yellow, condensed azo yellow, nickel azo yellow, isoindoline yellow, isoindolinone yellow, naphthol yellow, quinophthalone yellow, iron oxide, and titanium oxide. It is preferable. Due to the effect of the near-infrared reflective metal oxide, heat insulation is exhibited, and by lowering the heat storage temperature of the artificial turf by several degrees, an effect of alleviating the body temperature of the person on the artificial turf can be obtained, and moreover, an artificial turf close to the hue of natural turf can be obtained.

[0009] The heat-insulating and water-permeable artificial turf of the present invention is preferably such that the turf blades contain a keto / enol tautomer (one or more selected from benzotriazole-based compounds, triazine-based compounds, and diphenylketone-based compounds) and a hindered amine compound in a mass ratio of 10:1 to 2:1. By improving the light resistance and weather resistance of the artificial turf in this way, the service life can be extended.

[0010] The heat-insulating and water-permeable artificial turf of the present invention has a "A / B" two-layer structure formed by two kinds of thermoplastic resin compositions, namely "A" and "B", and the turf blades contain near-infrared reflective metal oxides and preferably have at least different types of the near-infrared reflective metal oxides. As a result, a gradation with different hues of the turf blades between the A layer and the B layer is formed, enabling the expression of the appearance of natural turf by visual hue mixing. Also, when different thermoplastic resins are used in the two thermoplastic resin compositions of "A" and "B", it acts on the curling effect of the turf blade shape due to differences such as stretchability and heat shrinkage.

Advantages of the Invention

[0011] According to the present invention, an artificial turf having a water-permeable function and further having heat-insulating properties and being close to the hue of natural turf can be obtained. Therefore, it is particularly suitable for sports arenas such as soccer fields, baseball fields, rugby fields, American football fields, tennis courts, golf short courses, pitch and putt, futsal courts, etc. It can also be used in a wide variety of applications such as slope greening and weed prevention along railway tracks, slope greening and weed prevention of artificial reservoirs, greening of building rooftops, verandas, terraces, multi-purpose space flooring in commercial facilities, flooring for theme parks and event venues, flooring for exhibitions of automobiles, motorcycles, etc., and flooring for pets. In the heat-insulating artificial turf of the present invention, the heat-insulating property refers to the effect of reducing the body temperature sensation on the artificial turf by lowering the heat storage temperature of the artificial turf by about 2 to 5 °C.

Embodiments for Carrying out the Invention

[0012] The heat-insulating and water-permeable artificial turf of the present invention is a laminate having at least three layers: a pile tuft layer having turf blades made of a thermoplastic resin implanted on one side or the entire surface of an open-mesh woven fabric substrate; a water-permeable resin layer that fixes the implantation part of the turf blades, impregnates and coats the back surface of the pile tuft layer, and holds the openings of the open-mesh woven fabric substrate; and a thermoplastic resin underpad layer provided in contact with this water-permeable resin layer. The turf blades contain at least a near-infrared reflective metal oxide and a pigment. The thermoplastic resin underpad layer has any one of the following drainage structures: 1) a structure having a large number of through-holes in the thickness direction through which the water-permeable resin layer is exposed; 2) a structure composed of a large number of island-shaped dots with the water-permeable resin layer exposed between these island-shaped dots; 3) a structure composed of stripes with the water-permeable resin layer exposed between these stripes; 4) a structure having irregularly continuous minute voids in the thickness direction. Also, there is an aspect in which the turf blades contain a keto / enol tautomer and a hindered amine compound in a mass ratio of 10:1 to 2:1, and an aspect in which the turf blades have a two-layer structure made of two thermoplastic resin compositions (difference in hue of the same thermoplastic resin or difference in hue of different thermoplastic resins).

[0013] The heat-insulating and water-permeable artificial turf of the present invention is a laminate having at least three layers: a pile tuft layer having turf blades made of a thermoplastic resin planted on one side or the entire surface of an open-mesh woven fabric substrate; a water-permeable resin layer that fixes the planting portion of the turf blades, impregnates and coats the back surface of the pile tuft layer, and retains the openings of the open-mesh woven fabric substrate; and a thermoplastic resin underpad layer provided in contact with this water-permeable resin layer. The turf blades preferably contain at least a thermoplastic resin, a near-infrared reflective metal oxide, and a pigment, and further contain a keto / enol tautomer and a hindered amine compound. The turf blades are manufactured from a thermoplastic resin composition such as a polyolefin resin, a polyester resin, a polyamide resin, or a polyvinylidene chloride resin. As the polyolefin resin, low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, propylene-ethylene block copolymer, propylene-ethylene random copolymer, etc. can be used, and particularly linear low-density polyethylene (a copolymer of ethylene and an α-olefin having 3 to 16 carbon atoms) is suitable. As the polyester resin, polyethylene terephthalate, polyethylene naphthalate, recycled polyethylene terephthalate, polyethylene terephthalate obtained by repolymerizing monomers obtained from depolymerized polyester, etc. can be used. As the polyamide resin, nylon 6, nylon 66, nylon 69, nylon 46, nylon 610, nylon 1010, nylon 11, nylon 12, nylon 6T, nylon 9T, etc. can be used. In particular, it is preferable to use turf blades made of a partially biomass polymer synthesized from biomass monomers synthesized from plant-derived materials or turf blades made of 100% biomass polymer to contribute to carbon neutrality. The MFR (melt flow rate: conforming to JIS K7210, 190°C, 2.16 kg load) of these thermoplastic resins is in the range of 0.5 to 25 g / 10 minutes and is suitable for the production of the following split yarns and flat monofilaments.

[0014] The turf blades may be a single resin layer, but it is preferable that the turf blades have a "A / B" two-layer structure composed of two types of thermoplastic resin compositions, "A" and "B", each containing a near-infrared reflective metal oxide, and at least the types of near-infrared reflective metal oxides are different. Thereby, a gradation with different hues of the turf blades between the A layer and the B layer is obtained, and it is possible to express the appearance of natural turf by visual hue mixing. Also, when different thermoplastic resins are used in the two thermoplastic resin compositions of "A" and "B", the curling effect of the turf blade shape due to differences in stretchability, heat shrinkage, etc. is exhibited. Specifically, examples include "A: linear low-density polyethylene" and "B: high-density polyethylene", "A: linear low-density polyethylene" and "B: polypropylene", "A: polyamide resin" and "B: polyvinylidene chloride resin", "A: polyester resin" and "B: polyvinylidene chloride resin", "A: linear low-density polyethylene" and "B: polyvinylidene chloride resin", etc. The thickness ratio of the "A" layer and the "B" layer is in the range of 3:1 to 1:3, preferably in the vicinity of 1:1 including 1:1. The greater the differences in the softening temperature, crystallization temperature, and shrinkage rate of these resins, the greater the deformation of the turf blades, resulting in a curled and bulky curl. The tuft height of the turf blades is in the range of 10 mm to 50 mm and can be freely selected according to the use and purpose of the artificial turf.

[0015] The long and narrow body of the turf blades is preferably in the form of split yarn or flat monofilament. The split yarn is formed by shaping a thermoplastic resin composition into a single-layer film or a film with an "A / B" two-layer structure composed of two thermoplastic resin compositions "A" and "B" using a T-die extrusion method, an inflation method, etc. The once-cooled and solidified film is reheated and stretched to form a group of flat yarns, and these are obtained by mechanically splitting them with a rotating needle roll. The turf blades are cut to a predetermined length and used for planting. The flat monofilament is obtained by stretching a thermoplastic resin composition into a single-layer or a group of monofilaments with an "A / B" two-layer structure composed of two thermoplastic resin compositions "A" and "B" extruded from a circular or shaped nozzle of a T-die, and performing relaxation heat treatment in a hot air circulation oven. The turf blades are cut to a predetermined length and used for planting. The split yarn and the flat monofilament may be in a form where they are twisted, twisted and heat-fixed, or the crimpability (curl) is fixed by heating. These are all important for increasing the volume of the turf blade pile, improving the cushioning property due to the entanglement of the turf blades, randomizing the direction of the turf blades, and obtaining a gradation effect of the hue. The twist and the crimp are adjusted according to the length of the turf blades. If the twist and the crimp are strong, the entanglement between the turf blades becomes strong, and the surface of the artificial turf becomes hard. Also, the twist and the crimp need to be heat-set so that the effects of the twist and the crimp do not return in an environment under the scorching sun. This is achieved by adjusting the balance with the softening temperature, crystallization temperature, relaxation heat treatment temperature and time, cooling temperature and time of the thermoplastic resin used. The split yarn has a thickness of 0.05 mm to 0.35 mm and a width of 0.075 mm to 3 mm, and the flat monofilament preferably has a thickness of 0.1 mm to 0.5 mm and a width of 0.2 mm to 1 mm. The tuft height ranges from 10 mm to 50 mm and can be freely selected according to the use and purpose of the artificial turf. If the tuft length is less than 10 mm, the cushioning property is inferior, and if it exceeds 50 mm, the self-standing property of the turf blades is deteriorated, and at the same time, the air permeability between the turf blades is deteriorated, resulting in an increase in heat storage of hot air. In the case of a tuft height of 10 mm to 50 mm for the crimp (curl) processing, the stretched length of the turf blades is about 20 mm to 100 mm.Also, in the range of the turf height of 20 mm to 50 mm, fill the spaces between the turf blades with sand, resin beads, resin beads containing near-infrared reflective metal oxides, or rubber chips, etc., and set the apparent turf blade tuft length to 5 mm to 25 mm, so as to increase the comfort of sports competitions and at the same time improve the heat insulation effect.

[0016] The turf blade contains at least a near-infrared reflective metal oxide and a pigment. The near-infrared reflective metal oxide is at least one blue to green metal composite oxide selected from cobalt-aluminum composite oxide, cobalt-aluminum-chromium composite oxide, cobalt-aluminum-magnesium composite oxide, cobalt-aluminum-zinc composite oxide, cobalt-tin composite oxide, cobalt-nickel-zinc composite oxide, cobalt-nickel-titanium-zinc composite oxide, cobalt-zinc-magnesium composite oxide, cobalt-zinc-chromium-titanium composite oxide, and cobalt-zinc-nickel-titanium composite oxide, and is used in an amount of 1 to 30 parts by mass, particularly 5 to 15 parts by mass, based on 100 parts by mass of the thermoplastic resin described in paragraph

[0013] . In the "A / B" two-layer structure of the turf blade, the near-infrared reflective metal oxides of "A" and "B" may be of different types and in the same amount, or of different types and in different amounts. The heat insulation property is exhibited by the effect of the near-infrared reflective metal oxide, and by lowering the heat storage temperature of the artificial turf by several degrees, an effect of alleviating the perceived temperature on the artificial turf can be obtained. The pigment is at least one selected from blue to green pigments such as phthalocyanine blue (α-type or β-type), anthraquinone blue, cobalt blue, ultramarine blue, dioxazine violet, quinacridone violet, indanthrene blue, indigo blue, perylene blue, phthalocyanine green, yellow to orange pigments such as monoazo yellow, disazo yellow, condensed azo yellow, nickel azo yellow, isoindoline yellow, isoindolinone yellow, naphthol yellow, quinophthalone yellow, and iron oxide, and titanium oxide white pigment (primary average particle size 0.8 to 1.2 μm). These pigments are used for adjusting the chroma to make the hue of the turf blade closer to that of natural turf. In particular, titanium oxide with a primary average particle size of 0.8 to 1.2 μm is used for adjusting the lightness and assisting the heat insulation effect. The addition of blue to green pigments makes the hue of the blue to green near-infrared reflective metal oxide a more vivid blue to green, and the addition of yellow to orange pigments makes the hue of the blue to green near-infrared reflective metal oxide a more vivid yellowish green. By adding the white pigment of titanium oxide to these, a brighter blue to green or yellowish green can be obtained.The blending amount of the pigment is arbitrary and there is no regulation, but it is preferably used in an amount of 0.01 to 10 parts by mass, particularly 0.05 to 5 parts by mass, based on 100 parts by mass of the thermoplastic resin described in paragraph

[0013] . Particularly when the turf blade has an "A / B" two-layer structure, the pigments of "A" and "B" may be of the same type (all the same) and in the same amount, of the same type (all the same) and in different amounts, of different types and in the same amount, or of different types and in different amounts. When using processed pigments such as masterbatch (plate-like), master pellet, and toner, the amount of the pigment component contained therein shall be used as the standard for the above blending amount. The color of the turf blade can be a single color, a mixture of two-color turf blades, a mixture of three-color turf blades, the use of one type of "A / B" two-layer structure turf blade, or a mixture of two types of "A / B" two-layer structure turf blades, etc., to express natural turf in the growth period as a whole artificial turf.

[0017] For the above colors, a small amount of near-infrared reflective metal oxides such as zinc-iron-chromium composite oxides, red metal composite oxides such as zinc-iron-chromium-aluminum composite oxides, bismuth-vanadium-aluminum composite oxides, nickel-barium-titanium composite oxides, nickel-titanium composite oxides, nickel-antimony-titanium composite oxides, chromium-antimony-titanium composite oxides, lead-antimony-titanium composite oxides, etc., and black metal composite oxides such as iron-chromium composite oxides, iron-chromium-cobalt composite oxides, iron-chromium-cobalt-manganese composite oxides, copper-chromium composite oxides, copper-magnesium composite oxides, copper-chromium-manganese composite oxides, copper-bismuth composite oxides, manganese-bismuth composite oxides, etc., can be additionally added to combine the heat insulation effect and hue adjustment. Similarly, a small amount of red to orange pigments such as azo lake red, monoazo red (Ca-based or Ba-based), condensed azo red, (dimethyl) quinacridone red, diketopyrrolopyrrole red, thioindigo magenta, perylene red, perinone red, anthraquinonyl red, and quinacridone violet, and black pigments such as carbon black, aniline black, carbon graphite, and titanium oxynitride can be additionally added to adjust the hue.

[0018] The turf blade contains a keto / enol tautomer (one or more selected from benzotriazole compounds, triazine compounds, and diphenyl ketone compounds) and a hindered amine compound as a mixture with a mass ratio of 10:1 to 2:1, in an amount of 0.5 to 5 parts by mass, particularly 1 to 3 parts by mass, based on 100 parts by mass of the thermoplastic resin constituting the turf blade described in paragraph

[0013] . By including these components, the light resistance and weather resistance of the artificial turf can be improved, and the service life can be extended. The keto / enol tautomer and the N-OR type hindered amine compound can provide a heat-insulating and water-permeable artificial turf with excellent weather resistance (reduction of ultraviolet degradation) by protecting the turf blade from ultraviolet damage. The keto / enol tautomer is one or more energy conversion substances selected from benzotriazole compounds (molecular weight 250 to 700), triazine compounds (molecular weight 250 to 750), and diphenyl ketone compounds (molecular weight 200 to 400), and is an organic compound in which R2-CH-(C=O)-R1 (keto isomer) and R2-C=CH(OH)-R1 (enol isomer) can undergo reversible conversion. This keto / enol tautomer repeats nanosecond-scale mutual conversion between the enol isomer and the keto isomer upon excitation by sunlight (ultraviolet) energy, so that the enol and keto isomers coexist in an equilibrium state within the turf blade. The received ultraviolet energy is converted into thermal energy of molecular vibration of the mutual conversion and released outside the system, and the expression of the energy attenuation effect can reduce the degradation damage caused by ultraviolet rays, thereby improving the durability of the heat-insulating and water-permeable artificial turf. Particularly, due to the synergistic effect with the N-OR type hindered amine compound, the frequency of discarding (i.e., replacement) of the heat-insulating and water-permeable artificial turf is reduced, and at the same time, the production volume of the artificial turf is also reduced, suppressing the excessive consumption of petrochemical resources that is a factor in carbon dioxide emissions, and contributing to the sustainable conservation of the global environment.

[0019] In benzotriazole compounds, the enol-type isomer has a C-N conjugate of one benzene ring (which may have one or two selected from C1-C10 alkyl groups, C4-C10 branched alkyl groups, and alkyl-substituted benzyl groups) with a hydroxyl group (1 or 2) / ketone group (0) and a benzotriazole ring (which may have a chlorine group) as the skeleton. The keto-type isomer has a C-N conjugate of one benzene ring (which may have any of C1-C10 alkyl groups, C4-C10 branched alkyl groups, and alkyl-substituted benzyl groups) with a hydroxyl group (0-1) / ketone group (1) and a benzotriazole ring (which may have a chlorine group) as the main skeleton. Specifically, as the enol type, 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol (molecular weight 447) can be exemplified. Also, in triazine tautomeric isomers, the enol-type isomer has a C-C conjugate of 1-3 benzene rings (which may have a C1-C10 alkyloxy group) with a hydroxyl group (1-2) / ketone group (0) and a 1,3,5-triazine ring (which may have an alkyl (1-2)-substituted phenyl group and / or a hydroxyl group (1-2)-substituted phenyl group) as the main skeleton. The keto-type isomer has a C-C conjugate of 1-3 benzene rings (which may have a C1-C10 alkyloxy group) with a hydroxyl group (0-1) / ketone group (1) and a 1,3,5-triazine ring (which may have an alkyl (1-2)-substituted phenyl group and / or a hydroxyl group (1-2)-substituted phenyl group) as the skeleton. Specifically, as the enol type, 2,4,6-tris(2-hydroxy-4-hexyloxy-3-methylphenyl)-1,3,5-triazine (molecular weight 700) can be exemplified. Particularly, hydroxy-phenyl-1,3,5-triazine derivatives are preferred. Also, in diphenylketone tautomeric isomers, the enol-type isomer has a main skeleton in which two benzene rings with a hydroxyl group (1-2) / ketone group (0) / alkyloxy group (0-1) are connected by a C=O bond.In addition, the keto isomer has a main skeleton in which one benzene ring (A) with a hydroxyl group (0 to 1) / keto group (1) / alkyloxy group (0 to 1) and one benzene ring (B) with a hydroxyl group (1 to 2) / keto group (0) / alkyloxy group (0 to 1) are linked by a C=O bond. As an enol form, specifically, [[2-hydroxy-4-(octyloxy)phenyl]](phenyl)methane (molecular weight 326) can be exemplified.

[0020] The hindered amine compound captures the peroxide radical (ROO·) generated by ultraviolet damage at the NH part, N-alkyl part, or N-OR part of the hindered amine structure, detoxifies it and releases it as alcohol, ketone, carboxylic acid, etc., and itself turns into a nitro radical (N·) or a nitroxyl radical (N-O·). By repeating the nanosecond-scale cycle in which the alkyl radical (R·) generated by ultraviolet damage is captured and the NH-type, N-alkyl or N-OR-type hindered amine compound also returns, the chain progression of the bond cleavage of the thermoplastic resin constituting the turf blades due to the attack of harmful radicals is suppressed, improving the service life. As a result, the frequency of disposal (i.e., replacement) of the heat-insulating and water-permeable artificial turf decreases, and at the same time, the production volume of the artificial turf also decreases, suppressing the excessive consumption of petrochemical resources that is a factor in carbon dioxide emissions, and contributing to the sustainable conservation of the global environment. As the hindered amine-based compound, those having at least 1 or more, preferably 2, or preferably 4, or preferably 6 hindered amine structures in its molecular structure are used. The N-position of the hindered amine structure has one or more substituents selected from hydrogen, an alkyl group having 2 to 18 carbon atoms, an alkoxy group having 2 to 18 carbon atoms, or a cycloalkoxy group having 5 to 12 carbon atoms, and the molecular weights of these are 200 to 400 (for 1 hindered amine structure), 400 to 700 (for 2 to 3 hindered amine structures), 700 to 1000 (for 4 to 5 hindered amine structures), 1000 to 2500 (for 6 or more hindered amine structures), which are excellent in residual retention on the turf blades and are preferable. Specifically, the NH type is tetrakis(2,2,6,6-tetramethyl-4-piperidyl) butane-1,2,3,4-tetracarboxylate, the N-alkyl type is specifically bis(1,2,2,6,6-pentamethyl-4-piperidyl) sebacate (N-CH3 type), and the N-OR is specifically bis(1-undecanoxy-2,2,6,6-tetramethylpiperidin-4-yl) carbonate.

[0021] In addition to the thermoplastic resin, near-infrared reflective metal oxide, pigment, keto / enol tautomer, and hindered amine compound, the turf leaves may be appropriately blended with antioxidants (such as hindered phenol-based, phosphite-based, sulfur-based, vitamin E-based, etc.), surfactants, ionic liquids, etc. as antistatic agents, bromine-substituted organic compounds as flame retardants, silane coupling agents (such as aminosilane, vinylsilane, epoxy silane, methacrylic silane, acrylic silane, chlorosilane, mercapto silane, isocyanurate silane, isocyanate silane, etc.), silicone oil, waxes (such as fatty acid amides like metaxylylene bis stearylamide, metaxylylene bis oleylamide, xylene bis stearic acid amide, ethylene bis stearylamide, ethylene bis stearic acid amide, etc., polyethylene wax), etc. as wear resistance enhancers, fungicides (such as imidazole-based, thiazole-based, isothiazoline-based, pyridine-based, triazine-based, triazole-based, N-haloalkylthio-based, quaternary ammonium salt-based, and organometallic-based, etc.), insect repellents (pyrethroid-based compounds), etc. In particular, by including 0.5 to 5 parts by mass, especially 1 to 3 parts by mass, of pyrethroid-based insect repellents such as empenthrin, flamethrin, prallethrin, allethrin, imiprothrin, pyrethrin, phthalthrin, resmethrin, phenothrin, metofluthrin, cinerin II, transfluthrin, jasmolin II, cyphenothrin, permethrin, silafluofen, tefluthrin, bifenthrin, cyfluthrin, etc. with respect to 100 parts by mass of the thermoplastic resin constituting the turf leaves described in paragraph

[0013] , it is possible to suppress the attraction of flying pests such as mosquitoes and flies and to suppress the reproduction of pests such as mites in the turf leaf pile layer.

[0022] To manufacture artificial turf using the above turf blades, a mesh knitted fabric substrate is fed into a tufting device, and the turf blades are tufted in a V-shape onto the mesh knitted fabric substrate by needle punching to implant the turf blades at a uniform density and form a turf blade pile layer. The tufting density is appropriately adjusted according to the thickness, width, and length of the turf blades. The tufting can also be done by gathering a plurality of turf blades together and implanting them in a stock shape like a toothbrush or a hairbrush. The mesh knitted fabric substrate is a woven or knitted fabric composed of warp yarns and weft yarns. The warp yarns and weft yarns are each composed of any one of multifilament yarns, staple fiber spun yarns, tape yarns, and split yarns. Tape yarns and split yarns obtained by splitting tape yarns have a width and length and are suitable for tufts, but because their surfaces are smooth, their adhesion to the water-permeable resin layer is insufficient, and they tend to be inferior in the adhesive fixability of the turf blades. Therefore, the yarns constituting the mesh knitted fabric substrate are preferably multifilament yarns with unevenness on the yarn surface, which are excellent in the anchoring effect with the water-permeable resin layer, and furthermore, staple fiber spun yarns having innumerable hairs on the yarn surface are preferably excellent in the anchoring effect with the water-permeable resin layer. For multifilament yarns and staple fiber spun yarns, polyester (such as polyethylene terephthalate, recycled polyethylene terephthalate, polyethylene terephthalate obtained by repolymerizing monomers obtained from depolymerized polyethylene terephthalate, biomass polyethylene terephthalate, etc.), polyamide (such as nylon 6, nylon 66, nylon 69, nylon 46, nylon 610, nylon 1010, nylon 11, nylon 12, nylon 6T, nylon 9T, etc.), vinylon, etc. are suitable. On the other hand, for tape yarns and split yarns, olefin resins with high stretchability and orientation such as low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, propylene-ethylene block copolymer, propylene-ethylene random copolymer, ethylene-vinyl acetate copolymer, etc. are suitable and are suitable for manufacturing flat yarns and split yarns. If these yarns are original yarns in colors such as green to dark green to black, the presence of the mesh knitted fabric substrate visible in the gaps between the turf blades can be concealed.In addition, as the yarns other than the above-mentioned yarns constituting the mesh knitted fabric base material, a part of the warp yarns and weft yarns includes conductive carbon fiber yarns, and by connecting and grounding to the ground wire, it is possible to eliminate static electricity charged on the turf leaves during sports competitions.

[0023] The fabric as the mesh knitted fabric base material is most preferably a plain weave fabric. In addition, twill fabrics (regular twills such as 2×2, 3×3, 4×4, irregular twills such as 3×2, 4×2, 4×3, 5×3, 2×3, 2×4, 3×4, 3×5), damask fabrics (having a minimum structural unit using at least 3 warp yarns and 3 weft yarns each: 3-harness twill, 4-harness twill, 5-harness twill, 6-harness twill, etc.), satin fabrics (having a minimum structural unit using at least 5 warp yarns and 5 weft yarns each: regular satin such as 2-shaft, 3-shaft, 4-shaft, 5-shaft, etc.), patterned gauze fabrics, moire fabrics (gauze fabrics, crepe fabrics), etc. can also be used. Knitted fabrics such as raschel knitted fabrics and tricot knitted fabrics can be used. The basis weight of the mesh knitted fabric base material is 100 to 300 g / m 2 and the porosity (occupancy rate of the total space generated by the entanglement of yarns) is preferably about 10 to 35%. For these mesh knitted fabric base materials, those subjected to known post-treatments such as dyeing, painting, resin coating, adhesion, water repellency, mildew prevention, flame retardancy, antistatic, corona, plasma, sputtering, vapor deposition, etc. can also be used. For these mesh knitted fabric base materials, a water-permeable non-woven fabric with a basis weight of 50 to 200 g / m 2 can be overlaid on the top and / or bottom to tuft the turf leaves.

[0024] The water-permeable resin layer is formed on the back surface of the open-weave fabric substrate with turf-like blades of grass, and is a coating layer having water permeability derived from the openings of the open-weave fabric substrate. The resin layer itself does not have water permeability. The thermoplastic resin constituting the water-permeable resin layer may be an emulsion such as an acrylic resin, a urethane resin, a polyester resin, an ethylene-vinyl acetate copolymer resin, a vinyl chloride-vinyl acetate copolymer resin, or a paint solubilized with an organic solvent, or a latex such as SBR (styrene-butadiene rubber) or NBR (acrylonitrile-butadiene rubber), or a soft vinyl chloride resin paste sol (containing a plasticizer). However, a soft vinyl chloride resin paste sol (containing a plasticizer) is preferred because of its excellent processability and durability. The main composition of the soft vinyl chloride resin paste sol is 100 parts by mass of paste vinyl chloride resin (low-temperature gelling type with an average degree of polymerization of about 700 to 1000, which also serves as a countermeasure against thermal deformation of the turf-like blades of grass), 30 to 100 parts by mass of a plasticizer (known plasticizers such as phthalic acid diesters, adipic acid diesters, polyester-based), 1 to 5 parts by mass of a stabilizer (barium / zinc composite type, mercapto tin-based, epoxidized soybean oil, etc.), 0 to 30 parts by mass of a filler (calcium carbonate, antimony trioxide, aluminum hydroxide, etc.), 0 to 10 parts by mass of a coloring toner (phthalocyanine blue, phthalocyanine green, carbon black, titanium oxide, etc.), and 0 to 100 parts by mass of a diluent (mineral terpene, mineral spirit, etc.). The water-permeable resin layer is formed on the back surface of the open-weave fabric substrate with turf-like blades of grass. By using a gravure roll of 20 to 60 meshes to apply this soft vinyl chloride resin paste sol (colored, for example, in green to dark green to black series) and completing the gelation of the soft vinyl chloride resin paste sol by heat treatment, water permeability can be maintained without filling the openings of the open-weave fabric substrate. Knife coating may clog the openings and inhibit water permeability. The basis weight (g / m 2 ) of the water-permeable resin layer varies depending on the specific gravity of the resin used. In the case of a soft vinyl chloride resin paste sol, 50 to 250 g / m 2 is optimal. The yarns constituting the open-weave fabric substrate are preferably dyed in green to dark green to black series, and the open-weave fabric substrate itself is preferably colored in green to dark green to black series.

[0025] On the surface of this water-permeable resin layer, there is provided an underpad layer made of any of the following four types of thermoplastic resins. The thermoplastic resin underpad layer can use elastomers such as urethane-based resins, polyester-based resins, ethylene-vinyl acetate copolymer resins, vinyl chloride-vinyl acetate copolymer resins, SBR (styrene-butadiene rubber), NBR (acrylonitrile-butadiene rubber), and soft vinyl chloride resin (containing plasticizer). However, an elastomer of the soft vinyl chloride resin (containing plasticizer) type is most preferable from the viewpoints of processability and durability. 1) It has a structure with a large number of through-holes in the thickness direction of the underpad layer, and the through-holes serve as a drainage mechanism for rainwater as the water-permeable resin layer is exposed through the through-holes. The underpad layer is, for example, a plate-shaped elastomer solid with a thickness of 5 mm to 25 mm, or a plate-shaped elastomer foam (stirred foam, chemical foam, hollow beads, etc.) with a thickness of 5 mm to 25 mm, in which, for example, a large number of circles with a diameter of 7 mm to 20 mm are punched out to form neatly arranged through-holes, or a large number of squares with a side length of 7 mm to 16 mm are punched out to form neatly arranged through-holes. The horizontal and vertical distances between these through-holes are 10 mm to 50 mm. The underpad layer with such through-holes is formed by pouring vinyl chloride resin paste sol into a mold with the through-holes as convex parts and heating and gelling it, or by pouring molten elastomer and molding it, and is laminated to the water-permeable resin layer with an adhesive. Also, the underpad layer is 2) composed of a large number of island-shaped dots, and has a structure in which the water-permeable resin layer is exposed between these island-shaped dots. The island-shaped dots are, for example, circular solids with a thickness of 3 mm to fifteen mm and a diameter of 20 mm to 50 mm, or foams (stirred foam, chemical foam, hollow beads, etc.), or, for example, square solids with a thickness of 3 mm to 15 mm and a side length of 20 to 50 mm, or foams (stirred foam, chemical foam, hollow beads, etc.). The horizontal and vertical distances between these island-shaped dots are 10 mm to 25 mm, and the area other than the island-shaped dots serves as a drainage mechanism for rainwater.The formation of island dots is achieved by placing a mold having a number of circular punches with a thickness of 3 mm to 15 mm and a diameter of 20 mm to 50 mm, or a number of square punches with a thickness of 3 mm to 15 mm and a side length of 20 to 50 mm on a water-permeable resin layer, pouring a vinyl chloride resin paste sol (non-foamed or foamed) into the punched part, removing the mold and heating and gelling it for molding, or pouring a molten elastomer and cooling after removing the mold. Also, the undercut layer is composed of 3) stripes, with a structure where the water-permeable resin layer is exposed between these stripes. The stripes are, for example, plate-shaped elastomers with a thickness of 5 mm to 25 mm and a width of 100 mm to 200 mm, or plate-shaped elastomer foams (chemical foaming, hollow beads, etc.) with a thickness of 5 mm to 25 mm and a width of 100 mm to 200 mm, and are laminated on the water-permeable resin layer with an adhesive. The distance between the stripes is, for example, 10 mm to 20 mm, and the area other than the stripes serves as a rainwater drainage mechanism. Also, the undercut layer is 4) a bird's nest structure having a three-dimensional space that irregularly adheres in the thickness direction by the random three-dimensional stacking of thermoplastic resin monofilaments. The thermoplastic resin monofilaments are olefin-based resins such as polyethylene or polypropylene. The diameter of the monofilaments is, for example, 0.5 mm to 2 mm. A semi-melt ejected randomly from a number of extrusion nozzles is continuously poured into water to form a cushion body with a bird's nest structure where the irregularly waved monofilaments adhere three-dimensionally. This cushion body is laminated on the water-permeable resin layer with a hot melt adhesive, and this cushion body itself serves as a rainwater drainage mechanism.

[0026] Specific examples and performance of the heat-insulating and water-permeable artificial turf of the present invention will be further described with reference to the following examples and comparative examples. The heat-insulating property and water-permeability of the heat-insulating and water-permeable artificial turf were evaluated by cut pieces constituting the heat-insulating and water-permeable artificial turf, and their performance was applied to the performance of the heat-insulating and water-permeable artificial turf. 〈Heat-insulating property〉 On a sunny day in August 2023, artificial turf (examples and comparative examples) with a 1 m × 1 m square size was arranged on the mortar floor of the rooftop of the Kusaka Office of Hirata Textile Dyeing Co., Ltd. in Kusaka City, Saitama Prefecture, and laid in a state where direct sunlight shines evenly. (Installed at 8:00 am when the influence of heat storage conduction on the mortar floor is small) The artificial turf was left to stand for six hours until 2 p.m., and the surface temperature was measured three times using a non-contact thermometer, and the average value was evaluated. <Water permeability> One liter of tap water was poured into the center of a 1m x 1m square piece of artificial turf, and the time it took for the tap water to drain from the underside of the artificial turf and collect in a receiving container to reach 0.5 liters was measured three times, and the average value was evaluated.

[0027] [Example 1] <Open knitted fabric base material> Black (carbon black) dyed polyethylene terephthalate (PET) staple spun yarn (S twist 600T / m), 20 count two-ply warp yarn (590 dtex) 46 ends / inch x 20 count two-ply weft yarn (590 dtex) 42 ends / inch: void ratio 14%: weight 184 g / m 2 A plain woven spun fabric was used. <grass leaves> The grass leaf composition of [Recipe 1] below was formed into a single layer film of 0.2 mm in thickness using a T-die extrusion method, and the film was once cooled and solidified. The film was then slit into 5 mm wide tapes, which were reheated and stretched to form flat yarns. These were then mechanically split using a rotating needle roll to form split yarns with a cross-sectional thickness of 0.15 mm and a cross-sectional width of 1.8 mm. These were then twisted at 100 T / m and heat-set into a twisted shape, and cut to a length of 3 cm to form grass leaves. The grass blades were tufted into a V-shaped plain weave spun cloth, with a mass of 876 g / m 2 A tuft base material having a tuft height of about 1.5 cm was obtained. [Formulation 1] Grass leaf composition Linear low-density polyethylene 100 parts by mass Cobalt-aluminum-chromium composite oxide (blue near-infrared reflective metal oxide) 10 parts by mass Copper phthalocyanine blue (β type), a phthalocyanine pigment (CI Pigment Blue B-15:3) 2.5 parts by mass Keto / enol tautomer (triazine compound: MW367) 3 parts by mass ※Triazine tautomers are enol-type with 2-hydroxyl group (1) / ketone group (0 Three benzene rings (4-butoxy groups), each at the 1-position C, and 1,3,5-triazine An organic compound with MW367 formed by C-C bonds between the 2,4,6-position C of the triazine ring and the 1-position C of the benzene ring. The keto form has Three benzene rings (4-butoxy groups) with 0 hydroxyl groups / 1 keto group at the 2-position, each C-C bonds (MW36 7) between the 1-position C and the 2,4,6-position C of the 1,3,5-triazine ring. The 1st, 2nd, and 4th positions represent the positions of the carbon atoms in the benzene ring, and the 2,4 ,6-position C represents the position of the carbon atom, and the 1,3,5-position represents the position of the nitrogen N. 1 part by mass of N-OR type hindered amine ※ Bis(1-undecyloxy-2,2,6,6-tetramethylpiperidin-4-yl carbonate (MW681) The obtained turf leaves exhibited a green color like that of natural turf. 〈Water-permeable resin layer〉 The soft vinyl chloride resin paste sol composition of the following [Formulation 2] was transfer-coated onto the back surface of the turf leaf tuft substrate using a coater equipped with a 20-mesh gravure roll, and this was heat-treated at 160 °C for 2 minutes to form a water-permeable resin layer with a mass of 136 g / m 2 , and the turf leaves were fixed to the open-weave fabric substrate. 〔Formulation 2〕Soft vinyl chloride resin paste sol composition for forming a water-permeable resin layer 100 parts by mass of paste vinyl chloride resin (average degree of polymerization 850) 55 parts by mass of diisononyl phthalate (plasticizer: Mw419) 10 parts by mass of tricresyl phosphate (flame-retardant plasticizer) 5 parts by mass of epoxidized soybean oil (stabilizer and plasticizer) 2 parts by mass of barium / zinc composite stabilizer 10 parts by mass of antimony trioxide (flame retardant) 2 parts by mass of carbon black (black pigment) 30 parts by mass of mineral terpene (diluent) 〈Underpad layer (1)〉 Using a soft vinyl chloride resin sheet with a thickness of 8 mm obtained by T-die extrusion of the soft vinyl chloride resin composition of [Formulation 3] below, circular through-holes with a diameter of 1.5 cm were punched in it. The arrangement of the through-holes was in a staggered pattern with a 4.5 cm interval both horizontally and vertically, and an underpad layer (1) of 880 g / m 2 was formed. A solvent-based two-component urethane adhesive (polycarbonate-type polyurethane with a polyol end / hexamethylene diisocyanate) was applied to this underpad layer (1). In the semi-dry state of the adhesive, it was laminated with the water-permeable resin layer surface provided on the turf blade base material to obtain artificial turf (1) of 1930 g / m 2 [Formulation 3] Soft vinyl chloride resin composition for underpad layer (1) Straight vinyl chloride resin (average degree of polymerization 1050) 100 parts by mass Diisononyl phthalate (plasticizer: Mw 419) 55 parts by mass Tricresyl phosphate (flame-retardant plasticizer) 10 parts by mass Epoxidized soybean oil (stabilizer and plasticizer) 5 parts by mass Barium / zinc composite stabilizer 2 parts by mass Antimony trioxide (flame retardant) 10 parts by mass Hollow glass beads (filler) 10 parts by mass Carbon black (black pigment) 2 parts by mass In the obtained artificial turf, a part of the water-permeable resin layer is exposed from the through-holes of the underpad layer (1), and the water-permeable resin layer has a structure having voids derived from the openings of the open-knit fabric base material. 〈Heat insulation and water permeability of heat-insulating and water-permeable artificial turf〉 On a sunny day in August 2023, the surface temperature at 14:00 was 48.4°C / 0.5L drainage time was 154 seconds

[0028] [Example 2] Keeping the same size specifications of the turf blades of the artificial turf in Example 1, except that [Formulation 1] was changed to [Formulation 4] and the underpad layer (1) was changed to the following underpad layer (2), artificial turf (2) of 1704 g / m was obtained in the same manner as in Example 1. 2 [Formulation 4] Turf blade composition ​​The 10 parts by mass of the cobalt-aluminum-chromium composite oxide (blue-based near-infrared reflective metal oxide) in [Composition 1] was changed to 10 parts by mass of a cobalt-aluminum-zinc composite oxide (blue-based near-infrared reflective metal oxide), and 2.5 parts by mass of copper phthalocyanine blue (β-type) (B-15:3 in the C.I. Pigment Blue group) of the phthalocyanine-based pigment was changed to 2.5 parts by mass of phthalocyanine green (G-1 in the C.I. Pigment Green group), and otherwise it was the same as [Composition 1]. This turf showed a green color like natural turf. 〈Underpad layer (2)〉 A transfer coating of the soft vinyl chloride resin paste sol composition of the following [Composition 5], which is composed of a large number of island dots (height 0.5 cm, diameter 2.5 cm: zigzag arrangement with left-right and up-down intervals of 0.8 cm) formed by heat gelation, and a structure in which a water-permeable resin layer is exposed in the gaps between these island dots. The underpad layer (2) 508 g / m 2 was formed, and artificial turf (2) 1704 g / m 2 was obtained. The water-permeable resin layer has a structure having voids derived from the openings of the open-weave fabric substrate. In addition, for the transfer coating screen, a stainless steel plate with circular punching molds (depth 0.5 cm, diameter 2.5 cm) arranged in a zigzag pattern with left-right and up-down intervals of 0.8 cm was used. 〔Composition 5〕Soft vinyl chloride resin composition for the underpad layer (2) with island dots Paste vinyl chloride resin (average degree of polymerization 1300) 100 parts by mass Diisononyl phthalate (plasticizer: Mw419) 55 parts by mass Tricresyl phosphate (flame-retardant plasticizer) 10 parts by mass Epoxidized soybean oil (stabilizer and plasticizer) 5 parts by mass Barium / zinc composite stabilizer 2 parts by mass Antimony trioxide (flame retardant) 10 parts by mass Hollow glass beads (filler) 10 parts by mass Carbon black (black pigment) 2 parts by mass 〈Heat insulation and water permeability of the heat-insulating and water-permeable artificial turf〉 On a sunny day in August 2023, the surface temperature at 14:00 was 48.6°C / Drainage time for 0.5L was 122 seconds

[0029] [Example 3] The size standard of the turf blades of the artificial turf in Example 1 remained the same, and [Formulation 1] was changed to [Formulation 6], and the underpad layer (1) was changed to the following underpad layer (3). Otherwise, it was the same as in Example 1, and artificial turf (3) 1769 g / m 2 was obtained. [Formulation 6] Turf blade composition 10 parts by mass of the cobalt - aluminum - chromium composite oxide (blue - based near - infrared reflective metal oxide) in [Formulation 1] was changed to 10 parts by mass of a cobalt - nickel - titanium - zinc composite oxide (blue - based near - infrared reflective metal oxide). Also, 2.5 parts by mass of copper phthalocyanine blue (β - type) (C.I.Pigment Blue group's B - 15:3) of the phthalocyanine - based pigment was changed to 1.5 parts by mass of phthalocyanine green (C.I. Pigment Green group's G - 1) and 1.0 part by mass of condensed azo yellow (C.I.Pigment Yellow group's Y - 12). Otherwise, it was the same as [Formulation 1]. This turf blade exhibited a green color like natural turf. 〈Underpad layer (3)〉 A transfer coating of the soft vinyl chloride resin paste sol composition of [Formulation 5], composed of a number of stripes (height 0.5 cm, width 10 cm: arranged with a vertical interval of 1.0 cm) formed by heat - gelation, and a structure in which a water - permeable resin layer is exposed in the gaps between these stripes. Underpad layer (3) 573 g / m 2 was formed, and artificial turf (3) 1769 g / m 2 was obtained. The water - permeable resin layer has a structure with voids derived from the openings of the open - weave fabric substrate. Note that for the screen for transfer coating, a stainless - steel plate with a die - cutting formwork of stripes with a depth of 0.5 cm and a width of 10 cm: arranged with a vertical interval of 1.0 cm was used. 〈Heat - insulating and water - permeable properties of the heat - insulating water - permeable artificial turf〉 On a sunny day in August 2023, the surface temperature at 14:00 was 48.2°C / Drainage time for 0.5L was 147 seconds

[0030] [Example 4] While keeping the size standard of the turf blades of Example 1 the same, [Formulation 1] was changed to [Formulation 7], and the underpad layer (1) was changed to the following underpad layer (4). Otherwise, it was the same as in Example 1 to obtain artificial turf (4) 1916 g / m 2 was obtained. [Formulation 7] Turf blade composition Except that 10 parts by mass of the cobalt-aluminum-chromium composite oxide (blue-based near-infrared reflective metal oxide) of [Formulation 1] was changed to 10 parts by mass of the cobalt-zinc-chromium-titanium composite oxide (blue-based near-infrared reflective metal oxide), and 2.5 parts by mass of copper phthalocyanine blue (β-type) (B-15:3 in the C.I. Pigment Blue group) of the phthalocyanine-based pigment was changed to 2.0 parts by mass of quinacridone violet (V-31 in the C.I. Pigment Violet group) and 0.5 part by mass of titanium oxide, it was the same as [Formulation 1]. This turf blade exhibited a green color like natural turf. 〈Underpad layer (4)〉 A semi-melt obtained by randomly ejecting the high-density polyethylene composition of the following [Formulation 8] from a plurality of extrusion nozzles was continuously poured into water, and the monofilaments with a thickness diameter of 0.75 mm that were irregularly waved were three-dimensionally adhered to form a cushion body with a thickness of 1.2 mm, a porosity of 40%, and a mass of 720 g / m 2 This cushion body was laminated on the water-permeable resin layer with a hot-melt adhesive to obtain artificial turf (4) 1916 g / m 2 was obtained. This cushion body itself serves as a rainwater drainage mechanism. [Formulation 8] High-density polyethylene composition for underpad layer (4) High-density polyethylene 100 parts by mass Carbon black (black pigment) 2 parts by mass 〈Heat insulation and water permeability of heat-insulating and water-permeable artificial turf〉 On a sunny day in August 2023, the surface temperature at 14:00 was 48.0 °C / Drainage time for 0.5 L was 93 seconds

[0031] [Example 5] With the size standard of the turf leaves of the artificial turf in Example 1 remaining the same, an artificial turf (5) of 1930 g / m was produced in the same manner as in Example 1, except that the turf leaves had a two-layer co-extrusion structure of "A / B", where A was [Formulation 1] and B was [Formulation 6]. 2 This two-layer, two-color turf leaf exhibited a green gradation similar to that of natural turf during the growth period. 〈Heat insulation and water permeability of heat-insulating and water-permeable artificial turf〉 On a sunny day in August 2023, the surface temperature at 14:00 was 48.0°C, and the 0.5L drainage time was 148 seconds.

[0032] [Example 6] With the size standard of the turf leaves of the artificial turf in Example 1 remaining the same, an artificial turf (6) of 1704 g / m was produced in the same manner as in Example 1, except that the turf leaves had a two-layer co-extrusion structure of "A / B", where A was [Formulation 4] and B was [Formulation 6]. 2 This two-layer, two-color turf leaf exhibited a complex green gradation similar to that of natural turf during the growth period. 〈Heat insulation and water permeability of heat-insulating and water-permeable artificial turf〉 On a sunny day in August 2023, the surface temperature at 14:00 was 48.3°C, and the 0.5L drainage time was 119 seconds.

[0033] [Example 7] With the size standard of the turf leaves of the artificial turf in Example 1 remaining the same, an artificial turf (7) of 1769 g / m was produced in the same manner as in Example 1, except that the turf leaves had a two-layer co-extrusion structure of "A / B", where A was [Formulation 1] and B was [Formulation 7]. 2 This two-layer, two-color turf leaf exhibited a complex green gradation similar to that of natural turf during the growth period. 〈Heat insulation and water permeability of heat-insulating and water-permeable artificial turf〉 On a sunny day in August 2023, the surface temperature at 14:00 was 48.1°C, and the 0.5L drainage time was 140

[0034] [Example 8] With the size standard of the turf leaves of the artificial turf in Example 1 remaining the same, an artificial turf (8) of 1916 g / m was produced in the same manner as in Example 1, except that the turf leaves had a two-layer co-extrusion structure of "A / B", where A was [Formulation 4] and B was [Formulation 7]. 2was obtained. This "A / B" two-layer and two-color turf blades exhibited a complex green gradation similar to that of natural turf during the growth period. 〈Heat Insulation and Water Permeability of Heat Insulating and Water Permeable Artificial Turf〉 On a sunny day in August 2023, surface temperature at 14:00 was 48.2°C / Drainage time for 0.5L was 95 seconds

[0035] [Comparative Example 1] With the same size specifications for the turf blades of the artificial turf in Example 1, an artificial turf (9) of 1880 g / m was prepared in the same manner as in Example 1, except that 10 parts by mass of the cobalt-aluminum-chromium composite oxide (blue-based near-infrared reflective metal oxide) in [Formulation 1] was omitted. 2 The turf blades of this artificial turf exhibited a toy-like and cheap green color. 〈Heat Insulation and Water Permeability of Heat Insulating and Water Permeable Artificial Turf〉 On a sunny day in August 2023, the surface temperature at 14:00 was 53.5°C / Drainage time for 0.5L was 152 seconds. Thus, for the artificial turf with turf blades omitting the blue-based near-infrared reflective metal oxide, the surface temperature increased by approximately 5°C, demonstrating the heat insulation effect of the artificial turf in Example 1.

[0036] [Comparative Example 2] With the same size specifications for the turf blades of the artificial turf in Example 1, an artificial turf (10) of 1677 g / m was prepared in the same manner as in Example 2, except that 10 parts by mass of the cobalt-aluminum-zinc composite oxide (blue-based near-infrared reflective metal oxide) in [Formulation 4] was omitted. 2 The turf blades of this artificial turf exhibited a toy-like and cheap green color. 〈Heat Insulation and Water Permeability of Heat Insulating and Water Permeable Artificial Turf〉 On a sunny day in August 2023, the surface temperature at 14:00 was 53.6°C / Drainage time for 0.5L was 126 seconds. Thus, for the artificial turf with turf blades omitting the blue-based near-infrared reflective metal oxide, the surface temperature increased by approximately 5°C, demonstrating the heat insulation effect of the artificial turf in Example 2.

[0037] [Comparative Example 3] With the same size specifications for the turf blades of the artificial turf in Example 1, an artificial turf (11) of 1735 g / m was prepared in the same manner as in Example 3, except that 10 parts by mass of the cobalt-nickel-titanium-zinc composite oxide (blue-based near-infrared reflective metal oxide) in [Formulation 6] was omitted.2 was obtained. The turf blades of this artificial turf exhibited a toy-like and cheap green color. 〈Heat insulation and water permeability of heat-insulating and water-permeable artificial turf〉 On a sunny day in August 2023, the surface temperature at 14:00 was 53.4 °C, and the 0.5 L drainage time was 142 seconds. For the artificial turf with turf blades omitting the blue-based near-infrared reflective metal oxide, the surface temperature increased by approximately 5 °C, demonstrating the heat insulation effect of the artificial turf of Example 3.

[0038] [Comparative Example 4] With the same size standard for the turf blades of the artificial turf of Example 1, an artificial turf (12) of 1888 g / m was prepared in the same manner as Example 3, except that 10 parts by mass of the cobalt-zinc-chromium-titanium composite oxide (blue-based near-infrared reflective metal oxide) of [Formulation 7] was omitted. 2 was obtained. The turf blades of this artificial turf exhibited a toy-like and cheap green color. 〈Heat insulation and water permeability of heat-insulating and water-permeable artificial turf〉 On a sunny day in August 2023, the surface temperature at 14:00 was 53.3 °C, and the 0.5 L drainage time was 100 seconds. For the artificial turf with turf blades omitting the blue-based near-infrared reflective metal oxide, the surface temperature increased by approximately 5 °C, demonstrating the heat insulation effect of the artificial turf of Example 4.

[0039] An artificial turf (13) of 1950 g / m was prepared in the same manner as Example 1, except that the open-mesh woven fabric substrate used in Example 1 was changed to a plain-woven spunbond fabric without open mesh. 2 was obtained. 〈Plain-woven spunbond fabric without open mesh〉 A plain-woven spunbond fabric with warp 20 / 2 (590 dtex) 50 ends / inch × weft 20 / 2 (590 dtex) 48 picks / inch made of black (carbon black) original polyethylene terephthalate (PET) staple fiber spun yarn (S twist 600 T / m), porosity 0%, and mass 206 g / m 2 was used. 〈Heat insulation and water permeability of heat-insulating and water-permeable artificial turf〉 On a sunny day in August 2023, the surface temperature at 14:00 was 48.4 °C, and the 0.5 L drainage time could not be measured. The artificial turf with turf blades using the plain-woven spunbond fabric without open mesh as the tuft substrate had no water permeability, demonstrating the drainage effect of the artificial turf of Example 1.

Industrial Applicability

[0040] According to the present invention, it is possible to obtain artificial turf that has a water permeable function, further has heat insulating properties, and moreover has a hue close to that of natural turf. Therefore, it is particularly suitable for sports arenas such as soccer fields, baseball fields, rugby fields, American football fields, tennis courts, golf short courses, pitch and putt golf, futsal courts, etc. Furthermore, it can be used for various purposes such as slope greening and weed prevention along railway tracks, slope greening and weed prevention of artificial reservoirs, greening of building rooftops, verandas, terraces, multi-purpose space flooring in commercial facilities, flooring for theme parks and event venues, flooring for exhibitions of automobiles, motorcycles, etc., and flooring for pets. In the artificial turf of the present invention, the heat insulating property is an effect of reducing the heat storage temperature of the artificial turf by several degrees to relieve the perceived temperature of the person on the artificial turf.

Claims

1. A laminate having at least three layers: a pile tuft layer having turf blades made of a thermoplastic resin implanted on one entire side of an open-mesh woven fabric substrate; a water-permeable resin layer that fixes the implantation part of the turf blades, impregnates and covers the back surface of the pile tuft layer, and retains the mesh of the open-mesh woven fabric substrate; and an underpad layer made of a thermoplastic resin provided in contact with this water-permeable resin layer. The turf blades contain at least a near-infrared reflective metal oxide and a pigment. The thermoplastic resin underpad layer has any one of the following drainage structures: 1) a structure having a large number of through holes in the thickness direction through which the water-permeable resin layer is exposed; 2) a structure composed of a large number of island-shaped dots with the water-permeable resin layer exposed between these island-shaped dots; 3) a structure composed of stripes with the water-permeable resin layer exposed between these stripes; 4) a bird's nest structure having a three-dimensional space irregularly adhered in the thickness direction by random volumetric stacking of thermoplastic resin monofilaments. The heat-insulating and water-permeable artificial turf is characterized by this.

2. The near-infrared reflective metal oxide is at least one selected from cobalt-aluminum composite oxide, cobalt-aluminum-chromium composite oxide, cobalt-aluminum-magnesium composite oxide, cobalt-aluminum-zinc composite oxide, cobalt-tin composite oxide, cobalt-nickel-zinc composite oxide, cobalt-nickel-titanium-zinc composite oxide, cobalt-zinc-magnesium composite oxide, cobalt-zinc-chromium-titanium composite oxide, cobalt-zinc-nickel-titanium composite oxide. And the pigment is at least one selected from phthalocyanine blue (α-type or β-type), anthraquinone blue, cobalt blue, ultramarine, dioxazine violet, quinacridone violet, indanthrene blue, indigo blue, perylene blue, phthalocyanine green, monoazo yellow, disazo yellow, condensed azo yellow, nickel azo yellow, isoindoline yellow, isoindolinone yellow, naphthol yellow, quinophthalone yellow, iron oxide, and titanium oxide. The heat-insulating and water-permeable artificial turf according to Claim 1.

3. The turf blades according to claim 1 or 2, wherein the turf blades contain one or more selected from keto / enol tautomers (benzotriazole-based compounds, triazine-based compounds, and diphenyl ketone-based compounds) and hindered amine compounds in a mass ratio of 10:1 to 2:

1.

4. The heat-insulating and water-permeable artificial turf according to any one of claims 1 to 3, wherein the turf blades have an "A / B" two-layer structure composed of two thermoplastic resin compositions of "A" and "B", each containing the near-infrared reflective metal oxide, and at least the types of the near-infrared reflective metal oxides are different from each other.