JP2022093947A - Heat insulation artificial lawn - Google Patents

Abstract

To provide an artificial lawn having a sufficient heat insulation effect.SOLUTION: An artificial lawn includes a base material 1 and a pile 2 planted on one side of the base material 1. The pile 2 contains an oxide capable of reflecting light in a near infrared wavelength range. A resin layer 3 is coated on one surface of the base material 1. The resin layer 3 contains a hollow substance composed of an oxide capable of reflecting light in a near infrared wavelength range and a ceramic.SELECTED DRAWING: Figure 3

Description

The present invention relates to an artificial turf used as a substitute for natural turf in sports facilities and the like, which has heat insulating properties and can prevent the invasion of thermal energy by efficiently reflecting thermal energy such as sunlight.

In recent years, as the sports population has grown and become more active, it has replaced the existing natural turf or clay courts in baseball fields, soccer, hockey and rugby fields, tennis courts, gateball fields and other ballparks, and outdoor sports facilities such as multipurpose plazas. As a result, artificial turf is often used. The reasons for this are that artificial turf is not easily affected by weather conditions, constant ground conditions are always maintained, maintenance is easy, convenience and management costs can be reduced.

While artificial turf has such advantages, natural turf used to be mainly made of piles, that is, short yarns and low shock absorption, and because the bottom of artificial turf was often a paved surface such as concrete. Compared to the above, it has been said that there is a problem in safety for athletes. However, in recent years, long piles with long piles and coarsely planted types planted on long pile artificial turf with pile yarn intervals, such as inorganic granules such as sand or elastic granules such as rubber chips between the pile yarns. It has been developed and improved with excellent shock absorption, and is widely used so that it is officially recognized or certified by international organizations of various sports.

However, even with artificial turf pavement, one of the problems common to all-weather athletic fields is that the surface temperature rises outdoors in the hot sun in the summer, and sometimes exceeds 70 ° C. In particular, long pile artificial turf containing granules, which has been widely used in recent years, has many air layers in the gaps between long piles and granules, so heat is harder to escape than artificial turf with short piles, and temperature rise is more likely to occur. There is a problem that has become. As a result, it is harsh for athletes, there is a risk of heat stroke, and there is a problem that it may have an adverse effect on the environmental temperature and eventually cause the heat island phenomenon, and countermeasures have been sought.

Currently conceivable countermeasures include a method of sprinkling water on the artificial turf, and further, for example, as disclosed in Patent Document 1, filling the artificial turf material with water retention. , The effect is limited to temporary.

Further, as a means for imparting heat-shielding property to artificial turf, Patent Document 2 discloses a method of applying a near-infrared reflective material to the surface layer surface of turf, and Patent Document 3 discloses a method of applying a heat-shielding paint. .. However, the method of applying paint or the like to the surface of turf has a high possibility that the paint will peel off under conditions of high friction in a playground or the like, and has a problem in durability. Further, Patent Document 4 discloses a heat-shielding fabric in which a resin layer containing an infrared reflective material is laminated on at least one surface of the base fabric, but the resin layer is likely to be peeled off under conditions of high friction, which is the same. So there is a problem with endurance.

Further, as disclosed in Patent Document 5, a method of adding a material having a high solar reflectance such as a white pigment to the artificial turf pile material itself, or mixing and knitting them with a green artificial turf. There is a method to suppress the high temperature, but it is difficult to adjust the color tone so that it is close to natural turf, and it is said that a sufficient heat shielding effect can be obtained by mixing with green artificial turf. sea bream. Further, Patent Document 6 discloses a heat-shielding artificial turf in which a material having a high reflectance to radiant heat is attached to the ground surface side of the base cloth by adhesion, stitching, or the like, but there is a problem in durability and sufficient. It is hard to say that a good heat shielding effect can be obtained.

Japanese Unexamined Patent Publication No. 2006-144345 Japanese Unexamined Patent Publication No. 2006-124984 Japanese Unexamined Patent Publication No. 2007-177143 Japanese Unexamined Patent Publication No. 2015-2003 Japanese Unexamined Patent Publication No. 2007-154623 JP-A-2018-127873

The present invention has been made in view of the problems of the prior art, and an object of the present invention is to provide an artificial turf having a sufficient heat shielding effect.

The first invention of the present application has a base material and a pile planted on one surface of the base material, and the pile can reflect light in the wavelength region of near infrared rays (wavelength: 700 to 2500 nm). An oxide capable of reflecting light in the wavelength range of near infrared rays (wavelength: 700 to 2500 nm) by coating a resin layer on one surface of the above-mentioned base material. It is a heat-shielding artificial turf characterized by containing a hollow substance composed of infrared rays and ceramics.

The second invention of the present application is a heat-shielding artificial turf characterized in that the oxide in the first invention of the present application contains Fe ₂ O ₃ and Cr ₂ O ₃ .

According to the heat-shielding artificial turf of the present invention, the oxide contained in the pile and the resin layer reflects light in the near-infrared wavelength region, so that it has heat-shielding properties, and the resin layer is a hollow substance made of ceramic. Since it contains, the conduction of heat energy is suppressed, and the hollow substance made of ceramic refracts, reflects and dissipates the heat, so that extremely excellent heat insulating and heat insulating effects can be exhibited.

FIG. 1 is a side view of an embodiment of the heat-shielding artificial turf of the present invention. FIG. 2 is a diagram schematically showing a manufacturing process of the heat-shielding artificial turf of the present invention. FIG. 3 is a diagram schematically showing a manufacturing process of the heat-shielding artificial turf of the present invention. FIG. 4 is a diagram schematically showing the manufacturing process of the heat-shielding artificial turf of the present invention. FIG. 5 is a diagram showing a comparison between an embodiment of the heat-shielding artificial turf of the present invention and the transition of the surface temperature of the conventional artificial turf.

Hereinafter, embodiments of the present invention will be described, but various changes and modifications can be made without departing from the technical scope of the present invention.

FIG. 1 is a side view of an embodiment of the heat-shielding artificial turf of the present invention. In FIG. 1, 1 is a base material, 2 is a pile, and 3 is a resin layer. The pile 2 contains Fe ₂ O ₃ and Cr ₂ O ₃ which are oxides capable of reflecting light in the near infrared wavelength region. In FIG. 1, small black dots in the pile 2 indicate the above oxides. The resin layer 3 contains Fe ₂ O ₃ and Cr ₂ O ₃ which are oxides capable of reflecting light in the wavelength region of near infrared rays, and a hollow substance made of ceramic. In FIG. 1, small black dots in the resin layer 3 show the above oxides, and various black hollow shapes such as spherical and oval-shaped show hollow substances made of ceramic.

Examples of the fibers constituting the base material 1 include natural cellulose fibers such as cotton and linen, regenerated cellulose fibers such as viscose rayon, high wet modulus rayon, polynosic, cupra and lyocell, wool, angora, cashimia and silk. Animal fibers, semi-synthetic fibers such as triacetate and diacetate, and synthetic fibers such as polyester, polyamide, acrylic, polypropylene, polyethylene, polyvinyl alcohol and vinyl chloride can be used. These fibers can be used alone or in admixture. Examples of the fiber combination in mixed use include polyester and cotton, polyamide and cotton, and the like.

The form of the base material 1 is not particularly limited, and for example, a woven fabric, a knitted fabric, a non-woven fabric, or the like can be adopted, but in general, a woven fabric or a knitted fabric is preferable. In this case, the woven fabric structure and the knitted fabric structure are not particularly limited, and the woven fabric structure includes, for example, the three original structures such as plain weave, twill weave, and satin weave, and their modified structures, warp double weave, weft double weave, and the like. Heavy structure and double weave can be used. On the other hand, as for the knitting structure, in the case of the weft knitting structure, the flat knitting (Tenjiku, Kanoko knitting, fleece knitting, splicing thread knitting (bare tenjiku etc.), jacquard knitting, etc.), rubber knitting (smooth edition, interlock edition, Milan rib) , Single picket, double picket, ripple, one-sided edition, one-sided bag edition, Ponchi Roma, etc.), pearl edition, etc. can be exemplified. In the case of vertical organization, single denby, single atlas, single chord, double denby, double atlas, double chord, half tricot, quinz chord, satin, fleece, jacquard, etc. Can be exemplified. The number of layers of the knitted fabric may be a single layer or two or more layers. In the present embodiment, the resin layer 3 is laminated on one side of the base material 1, but the resin layer 3 may be laminated on both sides of the base material 1.

The material and form of the pile 2 are not limited as long as the appearance of the turf leaves can be realized, but for example, the pile 2 can be formed by using a flat filament yarn (yarn) made of a resin material. As the resin material, a thermoplastic resin such as polyethylene, polypropylene, nylon, or vinylon can be typically selected. Further, the pile 2 of the present embodiment is fixed to the base material 1 by sewing a plastic thread (yarn) to be the pile 2 into the base material 1 using a tufting machine. The length (average value) from the surface of the base material 1 to the tip of the pile 2 is not particularly limited, but can be relatively short (generally called a short pile) of 6 mm or more and less than 50 mm, or 50 mm. With the above, it is possible to make it relatively long, such as 70 mm or less (generally called a long pile).

As the resin constituting the resin layer 3, for example, known resins such as SBR-based resin, urethane resin, acrylic resin, polyester resin, silicone resin, vinyl chloride resin, and nylon resin can be used. In the present embodiment, an SBR-based resin is used as the resin of the resin layer 3, and styrene-butadiene is mixed with a silicone acrylic resin in order to uniformly disperse the hollow substance composed of the oxide and the ceramic in the resin layer 3. The one to which rubber was added was used.

As the hollow substance made of ceramic, for example, a silicon boroborosic ceramic balloon is preferably used because it can reflect sunlight and the like on its surface layer and inside, and is hollow and has excellent heat insulating properties. In order to densely laminate and arrange the hollow substance made of ceramic in the resin layer 3, it is necessary to sufficiently stir at the constitutional stage of the resin layer 3, but at the time of the stirring, it has sufficient load capacity and strength. It is preferable to use a stirrer capable of appropriately arranging the hollow material of the ceramic in the resin layer 3 and suppressing the destruction of the hollow material of the ceramic. It is preferable that the hollow material made of ceramic has a plurality of particle sizes. For example, a mixture of particles of 5 to 40 μm (average particle diameter 20 μm), 5 to 60 μm (average particle diameter 25 μm), 5 to 90 μm (average particle diameter 40 μm) and 20 to 110 μm (average particle diameter 50 μm) should be used. Can be done. That is, it is preferable to have a wide range of particles having different particle diameters, from those having a relatively small particle diameter to those having a relatively large particle diameter.

In such a case, the hollow substance having a small particle size enters the gap between the hollow substances having a large particle size, and the gap between the hollow substances is made smaller. That is, the hollow material can be arranged more densely. Therefore, the reflectivity and heat insulation can be further improved.

Further, in order to improve the heat insulating property by forming the resin layer 3, the ceramic material of the hollow ceramic material, its particle size, the thermal conductivity of the resin matrix, etc. have a great influence, and these elements should be appropriately combined. The resin layer 3 having excellent heat insulating properties can be obtained, and the total weight of the hollow material of the ceramic in the resin layer 3 is determined. Further, the content of the hollow substance in the entire resin layer is preferably set to a value such that the volume ratio of the hollow substance to the resin layer 3 is 1 to 10%. If the content is outside this range, an appropriate dense laminated array cannot be obtained, which is inappropriate. That is, if the content is large, the hollow substances are deteriorated, and if the content is small, the hollow substances are separated from each other, resulting in deterioration of the heat shielding performance.

Examples of the shape of the hollow substance include a spherical shape, an oval shape, a needle shape, a plate shape, a columnar shape, and the like, and the shape is not particularly limited, but among them, a spherical shape having an excellent reflection function is preferably used. .. As a method for producing a hollow substance, in addition to the known sol-gel method, any method that can obtain a hollow substance as a result can be used.

Next, a method for manufacturing the heat-shielding artificial turf shown in FIG. 1 will be described. First, the needle through which the pile thread is passed is moved up and down with respect to the base material, and the head of the pile is cut with a knife. Then, Fe ₂ O ₃ and Cr ₂ O ₃ are dispersed in polyethylene at a high concentration, and Fe ₂ O ₃ and Cr ₂ O ₃ are kneaded into the pile yarn by the masterbatch method. Pile 2 is planted in the material 1. Next, with the pile 2 facing up with respect to the base material 1, an SBR-based resin containing Fe ₂ O ₃ and Cr ₂ O ₃ and a ceramic hollow substance is applied to the lower surface of the base material 1 and shown in FIG. As described above, the pile 2 is planted on the upper surface of the base material 1 to obtain a heat-shielding artificial turf having the resin layer 3 on the lower surface of the base material 1. Further, if necessary, the synthetic rubber 4 (secondary base material) can be attached to the lower surface of the resin layer 3 as shown in FIG.

In FIG. 5, the base material 1 is a polypropylene plain fabric, the material of the pile 2 is polyethylene, the pile 2 contains Fe ₂ O ₃ and Cr ₂ O ₃ , and the resin layer 3 is Fe in the SBR resin. The heat-shielding artificial turf of the present invention containing ₂ O ₃ and Cr ₂ O ₃ oxides and a hollow ceramic substance, the base material 1 is a polypropylene plain fabric, and the material of the pile 2 is polyethylene. It is a figure which compares and shows the transition of the surface temperature of the conventional artificial turf in which the resin layer 3 is an SBR-based resin. That is, in the conventional artificial turf, the resin layer 3 does not contain the oxides of Fe ₂ O ₃ and Cr ₂ O ₃ and the hollow substance of the ceramic, and the pile 2 also contains Fe ₂ O ₃ and Cr. _Does not contain _2O3 . In FIG. 5, line A shows the transition of the surface temperature of the heat-shielding artificial turf of the present invention, and line B shows the transition of the surface temperature of the conventional artificial turf. That is, FIG. 5 shows that the artificial turf of the present invention and the conventional product are irradiated with a 500 W halogen lamp from a position of 450 mm in height, and after 5 minutes, 10 minutes, 20 minutes, and 30 minutes. The transition of the surface temperature (° C) is shown. As shown in FIG. 5, it can be seen that the heat-shielding artificial turf (line A) of the present invention has a smaller amount of increase in surface temperature than the conventional artificial turf (line B).

The present invention is suitable as a heat-shielding artificial turf.

1 base material 2 pile 3 resin layer 4 synthetic rubber

Claims (2)

It has a substrate and a pile planted on one surface of the substrate, the pile containing an oxide capable of reflecting light in the near infrared (wavelength: 700-2500 nm) wavelength range. , A resin layer is coated on one surface of the above-mentioned base material, and the above-mentioned resin layer is a hollow substance composed of an oxide and a ceramic capable of reflecting light in a wavelength region of near infrared rays (wavelength: 700 to 2500 nm). A heat-shielding artificial turf characterized by containing. The heat-shielding artificial turf according to claim 1, wherein the oxide contains Fe ₂ O ₃ and Cr ₂ O ₃ .

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