JP4091970B1 - Thermal barrier artificial turf pile and method for manufacturing the same - Google Patents

Abstract

[PROBLEMS] An artificial turf pile that has excellent heat-shielding properties and can be freely adjusted in color, including black, and suppresses the rise in surface temperature of artificial turf surface pavement, and manufactures such artificial turf piles as general artificial turf piles Means for producing by a masterbatch method in the process are provided.
A color pigment composition containing a perylene pigment having a heat resistance limit of 250 ° C. or higher and 350 ° C. or lower and a solar reflectance specified in JIS A5759 of 15% or higher and 95% or lower. It is an artificial turf pile.
[Selection] Figure 3

Description

  The present application belongs to a technical scope relating to artificial turf used as a substitute for natural turf in sports facilities and the like.

  In recent years, as the sports population has grown and activated, outdoor sports facilities such as baseball fields, soccer, hockey and rugby fields, tennis courts, gateball fields, and other multi-purpose open spaces have been replaced with existing natural grass or clay courts. Artificial turf is often used. The reason is that the artificial turf is not easily affected by weather conditions, always maintains a constant ground condition, is easy to maintain, and can reduce convenience and management costs.

  While artificial turf has such advantages, it used to be mainly piles, that is, those with short leaf yarns and low shock absorption, and because there were many paved surfaces such as concrete under artificial turf, natural turf It has been said that there is a problem with safety for the competitors. In recent years, however, long pile piles, or coarse planting types that are planted on long pile artificial turf with a pile thread interval between them, inorganic particles such as sand or elastic granules such as rubber chips between the pile threads. Development and improvement of products with excellent shock absorption are progressing, and are widely used so that they are officially recognized or certified by various international organizations.

  However, artificial turf pavement also has a common problem in all-weather playgrounds, which is that the surface temperature in hot weather outdoors in summer is high, sometimes exceeding 70 ° C. In particular, the long pile artificial turf with granular materials, which has been widely used in recent years, has a large air layer in the gap between long piles and granular materials. There is a problem. As a result, it is severe for the competitors, there is a risk of heat stroke, and there are problems of adverse effects on the environmental temperature and eventually the heat island phenomenon, and countermeasures have been demanded.

  Currently considered measures include watering the artificial turf, and further, for example, filling the artificial turf material with water retention capability as disclosed in Patent Document 1. The effect is limited to temporary ones.

  Further, as a means for imparting heat insulation to artificial turf, for example, a method of applying a near-infrared reflecting material disclosed in Patent Document 2 to the surface of the turf surface, the present applicants previously provided in Patent Document 3 There is a method of applying a thermal barrier paint. However, the method of applying paint to the surface of the turf surface has a problem in structural durability because the paint is highly likely to peel off under conditions of high friction in a sports field or the like.

  Further, as disclosed in, for example, Patent Document 4, a method of adding a material having high solar reflectance such as a white pigment to the material of the artificial turf pile itself, or mixing and knitting them with green artificial turf Although there is a method to suppress the increase in temperature, it does not reach the adjustment of the color tone close to that of natural turf, and it can be said that sufficient heat shielding effect can be obtained by mixing with green artificial turf. It ’s hard.

JP 2006-144345 A JP 2006-124984 A JP 2007-177143 A JP 2007-154623 A

  In view of the above points, the inventors of the present application have an excellent heat insulating property used for the heat insulating coating material of Patent Document 3 with respect to the suppression of the increase in the surface temperature of the artificial turf surface pavement, and also include a black color system. A heat-shielding pigment capable of freely adjusting the color tone was kneaded into the resin composition, and means for manufacturing the artificial turf pile by a master batch method in a general artificial turf pile manufacturing method was taken.

  However, artificial turf piles with this structure faced new problems in that they produced color abnormalities due to material deterioration during production and were unable to obtain physical performance such as heat insulation. This is because some pigments have low heat resistance, and the pigment composition undergoes thermal decomposition when the molding temperature in the pile extrusion molding process is 220 to 230 ° C. In particular, the methiazo pigment selected by the inventors as a black pigment having a high heat-shielding property has insufficient heat resistance against the molding temperature of the artificial turf pile. However, it has been difficult to adjust black color by additive color mixing, and a black pigment was required for color tone adjustment.

  Therefore, in order to solve this problem, as a result of intensive studies for the purpose of obtaining an artificial turf pile containing a color pigment composition that does not cause thermal decomposition even at 250 ° C. or higher exceeding the normal artificial turf pile molding temperature. It came to obtain the artificial turf pile of this invention, and its manufacturing method.

  In order to achieve the above object, the artificial turf pile and the manufacturing method thereof according to the present invention employ the following means.

  That is, the artificial turf pile according to claim 1 is a colored pigment including perylene pigments having a heat resistance limit of 250 ° C. or more and 350 ° C. or less and a solar reflectance as defined in JIS A5759 of 15% or more and 95% or less. It is characterized by containing a composition.

  And this artificial turf pile has a black color such as black, gray, brown, green, etc., and the heat resistance limit of the composition pigment is 250 ° C. or higher. However, it contains a perylene pigment that does not deteriorate the color of the pigment and has a heat shielding property that prevents temperature rise due to sunlight due to high sunlight reflectance.

  Further, the artificial turf pile according to claim 2 contains a colored pigment composition including perylene pigments having a QUV deterioration upper limit of 2 (ΔE) or less as defined in JIS K5600, 7.8. Features.

  And this artificial turf pile has little deterioration by the ultraviolet rays of a perylene pigment.

  The artificial turf pile according to claim 3 contains a colored pigment composition containing a perylene pigment having a heat resistance of 250 ° C. or higher and 350 ° C. or lower according to DIN. EN12877. .

  The structure of the artificial turf pile is difficult to decompose due to the high heat of the perylene pigment.

  Further, in the artificial turf pile according to claim 4, the composition other than the perylene pigment of the color pigment composition has a heat resistance limit of 250 ° C. or more and 1100 ° C. or less, and the solar reflectance specified in JIS A5759 is 15% or more and 95. % Or less of the pigment selected from the following.

  And this artificial turf pile has the coloring pigment composition comprised by what the pigments other than a perylene type were also provided with the heat-resistant limit and heat-shielding property.

  The artificial turf pile according to claim 5 is a pigment selected from those having a QUV deterioration upper limit of 2 (ΔE) or less as defined in JIS K5600, 7.8. It is characterized by comprising.

  And this artificial turf pile has the coloring pigment composition comprised by what the pigment other than a perylene type also has little deterioration by an ultraviolet-ray.

  The artificial turf pile according to claim 6 is a pigment selected from pigments other than the perylene pigment of the color pigment composition, each having a heat resistance of 250 ° C. or higher and 1100 ° C. or lower as defined in DIN. EN12877. It is characterized by becoming.

  And this artificial turf pile has the coloring pigment composition comprised by what a property other than a perylene pigment is hard to change chemically by high heat.

  The artificial turf pile according to claim 7, wherein the composition other than the perylene pigment of the color pigment composition is titanium oxide, iron oxide, phthalocyanine, imidazolone, monoazo-disazo condensation, dioxazine, quinacridone. It consists of the pigment chosen from either.

  And this artificial turf pile has the pigment which shows a suitable value in a heat-resistant limit, a sunlight reflectance, a QUV deterioration upper limit, and heat resistance in all as a composition of a colored pigment composition.

  In addition, the artificial turf pile according to claim 8 is characterized by containing 1 to 15% by weight of the total amount of the color pigment composition with respect to the raw material of the artificial turf pile.

  This artificial turf pile contains a minimum of 1.0 wt% of pigment to provide a coloring effect and heat shielding properties, and a maximum of 15 wt% enables the incorporation of the pigment into a synthetic resin material. Therefore, the tensile strength of the artificial turf becomes the maximum value.

  The artificial turf pile according to claim 9 is characterized in that the content of perylene pigment in the colored pigment composition is 0.5 to 10% by weight.

  And this artificial turf pile contains the range of perylene in which sufficient coloring is provided in a coloring pigment composition.

  The method for producing an artificial turf pile according to claim 10 is characterized in that a molding pellet kneaded with the color pigment composition is melted and extruded at a temperature of 190 to 250 ° C.

  And this artificial turf pile manufacturing method manufactures the artificial turf pile containing the pigment composition containing a perylene pigment using the extrusion manufacturing method used conventionally.

  According to the artificial turf pile according to claim 1 of the present invention, the perylene pigment provides a color tone including black and a heat shielding property, and the color tone does not deteriorate due to high heat at the time of molding. By combining these properties, it can be applied to artificial turf that is particularly suitable for outdoor facilities where the black color can be adjusted and the surface temperature does not increase during use. The artificial turf pile can be manufactured according to a manufacturing method including heat molding conventionally used for manufacturing an artificial turf pile.

  Further, according to the artificial turf pile according to claim 2 of the present invention, since the perylene pigment is less deteriorated by ultraviolet rays mainly containing direct sunlight, the weather resistance particularly when used as artificial turf outdoors is high. An artificial turf pile is obtained in which the color and heat shielding properties of the pigments do not deteriorate.

  Further, according to the artificial turf pile according to claim 3 of the present invention, the heat resistance limit that the perylene pigment has heat resistance indicating that it is stable to heat in chemical properties, and the color does not deteriorate with respect to heat. Stability is ensured from another aspect. It is also protected from degradation of the artificial turf pile material by decomposed pigments.

  In addition, according to the artificial turf pile according to claim 4 of the present invention, since the pigment composition for adjusting the color tone has both the heat resistance limit and the heat shielding property, the color tone and the heat shielding property are exhibited even by high heat during molding. An artificial turf pile that does not deteriorate is obtained.

  In addition, according to the artificial turf pile according to claim 5 of the present invention, since the composition of the color pigment composition is composed of a material that has little deterioration from ultraviolet rays, the weather resistance of the color pigment composition as a whole is guaranteed. Is done.

  Moreover, according to the artificial turf pile according to claim 6 of the present invention, the color pigment composition has heat resistance indicating that the composition of the color pigment composition is stable to heat from the viewpoint of chemical properties, and the color pigment composition as a whole Stability to heat during production is guaranteed.

  Further, according to the artificial turf pile according to claim 7 of the present invention, an artificial turf pile having heat insulation and capable of being manufactured by heat molding is obtained because of the composition of the color pigment composition.

  Further, according to the artificial turf pile according to claim 8 of the present invention, an artificial turf pile having both color, thermal insulation and tensile strength as artificial turf can be obtained as long as it can be manufactured by kneading pigment.

  Further, according to the artificial turf pile according to claim 9 of the present invention, a sufficient black color can be obtained by the perylene having a strong coloring power, and the color of the artificial turf pile can be selected widely.

  Moreover, according to the manufacturing method of the artificial turf pile concerning Claim 10 of this invention, the artificial turf pile which has heat-resistant performance and heat insulation can be manufactured using the conventional manufacturing method and equipment.

  Hereinafter, the present invention will be described in detail.

  In the present invention, the color pigment composition kneaded with the artificial turf pile material has a heat resistance limit of 250 ° C. or higher, a solar reflectance specified by JIS A5759 of 15% or higher, and a QUV deterioration upper limit specified by JIS K5600, 7.8. Is a perylene pigment having a heat resistance of 250 ° C. or higher as defined in DIN. EN12877.

Perylene shown in Chemical formula 1 was initially useful as a VAT dye soluble in a solvent, but is pigmented by adding side chains and crystallinity to the structure.

  The heat resistance limit, weather resistance, solar reflectance, and heat resistance of the perylene pigment used in the present invention are selected according to the following criteria.

  The heat resistance limit is provided as a standard for the pigment not to cause a change in color tone due to heat, and the following method is used for the measurement. That is, it is obtained by using a non-heat-treated pigment that has not been subjected to heat history, and a coating film obtained by putting a pigment on a watch glass and keeping it at a constant atmospheric temperature for 30 minutes and forming a paint using this heat-treated pigment The color difference ΔE from the coated film is measured. With the latter as a standard, ΔE is 2 or less, so that the heat resistance limit is equal to or higher than the ambient temperature. The requirement for a heat resistance limit of 250 ° C. or higher is a value as a temperature that can sufficiently withstand the molding of the pile at 220 to 230 ° C., but preferably the heat resistance limit is 260 ° C. or higher. And more preferably. Organic pigments, including perylene-based ones, have particularly high heat resistance limits and are assumed to be 320 ° C. and up to about 350 ° C. at the maximum.

  The solar reflectance is the most important standard for heat shielding, and the solar reflectance in the region of 350 to 2100 nm defined by the architectural heat ray shielding and glass scattering prevention film defined by JIS A5759 is 15% or more. . Furthermore, it is desirable to select a pigment that is 20% or more.

  The weather resistance, which is the resistance to ultraviolet irradiation, is based on the fact that ΔE after QUV and 1000 hrs treatment is 2 or less according to JIS K5600, 7.8.

  The heat resistance is a standard that the physical properties of the pigment are not changed mainly by heat, and is 250 ° C. or higher based on the standard of DIN. EN12877. This is also because the properties do not change at the temperature of the pile molding as in the heat resistance limit, and it is more preferable that the temperature is preferably 260 ° C. or higher. Similar to the heat resistance limit, organic pigments including perylene have high heat resistance, and pigments of 320 ° C. and up to about 350 ° C. are assumed.

  As a perylene pigment satisfying these conditions, black FK-4280 (BASF) and the like are commercially available and can be used particularly suitably for dark color adjustment. In addition, amber-based Fastgen Blue 548 (DIC Corporation), Fastgen Green S (DIC Corporation), and the like are commercially available for perylene systems other than black and can be suitably used.

  Various monochromatic pigments are combined in the color pigment composition according to the target color tone. In the case of artificial turf that is mainly green, combine pigments such as white, brown, yellow, green, blue, purple, and black.

  At this time, the perylene pigment described above is used for black. In addition, colors other than black among perylene pigments can also be used for colors other than black.

  As for the pigments other than the perylene-based pigment, a pigment having a heat resistance limit, weather resistance, solar reflectance, and heat resistance selected according to the same criteria as in the case of the perylene-based pigment is selected. The upper limit of heat resistance and heat resistance can be assumed to be as high as 320 ° C and a maximum of around 350 ° C for organic pigments, and as high as 1050 ° C and a maximum of around 1100 ° C for inorganic pigments. Can be used as a pigment having high heat resistance.

  Non-perylene pigments that have heat resistance, weather resistance, solar reflectance, and heat resistance include titanium oxide for white, red iron oxide for brown, phthalocyanine for green, and imidazolone for yellow For example, a quinacridone type for red, a quinacridone type for red, a dioxazine type for purple, and a monoazo-disazo condensate type for brown can be used.

  Specific examples of pigments include JR-1000 (Taika) for white, 120ED (Toda Chemical) for brown, Fast Brown HFR (Hoechst), and HG-2 (Clarian for yellow). ), 3912 (BASF), Fast Yellow H2G (Hoechst), etc. For orange, Fast Orange GRL (Hoechst), etc., for green, 5370S (DIC) can be used.

  In the present invention, since a pigment having high sunlight reflectance regardless of color is selected including perylene, the color pigment composition can be adjusted to a dark color tone, for example, dark green suitable for artificial turf piles. In industrial data, dark color means that the L * value of the CIE 1976 L * a * b * color space is less than 60, especially less than 30.

  The total blending amount of the color pigment composition with respect to the total amount of the raw material of the artificial turf pile needs to be a color effect and an amount capable of sufficiently incorporating the pigment into the raw material such as a synthetic resin in the process. It is from about 0.5 wt% at least that there is a coloring effect on the total amount of raw material. In addition, the pigment can be kneaded up to a maximum of 15.0 wt%, but if it exceeds that, it becomes difficult.

  In addition, it is more desirable as a heat-resistant and heat-insulating artificial turf. In addition to sufficiently obtaining the sunlight reflectance that directly affects the heat-shielding performance of the artificial turf pile, the strength of the pile is stable in view of use as an artificial turf. Need to be obtained. For example, in order to reduce the light transmittance of the artificial turf pile and obtain sufficient sunlight reflectance, a certain amount of coloring is necessary, and in a polypropylene sheet, it is desirable that the pellet contains a composite pigment of 2 wt% or more, Furthermore, if the sunlight reflectance is 5 wt% or more, it is saturated to near the maximum value. On the other hand, the tensile strength of the sheet is particularly stable when the blending amount of the composite pigment is less than 5 wt%, and greatly decreases when the blending amount is 12 wt% or more. In view of these values, it is preferable to use the pigment in a blending amount of 2 to 12 wt%, particularly 5 to 12 wt% if emphasis is placed on the colorability / reflection performance, and 2 to 5 wt if particularly emphasis is placed on the strength of the turf. % Can be selected. If both the reflectivity and the intensity are compatible, about 5 wt% (4 to 6 wt%) is most desirable.

  The content of the perylene pigment in the color pigment composition is adjusted according to the target color. Perylene has a very high coloring power, and perylene pigments can be sufficiently adjusted to black by mixing 0.5 to 10%, usually 0.5 to 1.5 wt% of the total weight of the color pigment composition. .

  The artificial turf pile of the present invention can be implemented using a manufacturing method, process, and apparatus according to a conventional ordinary masterbatch method. That is, pellets made of a kneaded compound such as a color pigment composition, a dispersing agent, and a stabilizer in a synthetic resin mainly composed of polyolefin or polyamide are melt-spun (190 to 230 ° C.), cooled and solidified, and stretched (100 To 150 ° C.) and a relaxation heat treatment to form a flat yarn or a film having a yarn pressure of 30 to 150 μm, and a split yarn obtained by longitudinally cutting or splitting it into a pile is preferably produced. The artificial turf cloth of the surface layer of the artificial turf pavement is manufactured by planting this artificial turf pile on the base cloth by an appropriate method.

  As the synthetic polymer used as the material for the artificial turf pile, one or more of synthetic resins conventionally used for artificial turf such as polyolefin and polyamide, such as polypropylene, polyethylene, nylon 6 and nylon 66, may be used. it can. Conventionally, polypropylene has been most frequently used, but polyethylene, which does not easily increase in temperature due to friction, can also be suitably used as heat- and heat-insulating artificial turf. be able to.

  Polyolefin materials that are particularly often used for artificial turf pile materials are usually considered to be hardly adhesive and difficult to color, whereas very little perylene pigment is added depending on the strength of the coloring power of perylene. However, it is a feature of the present invention that sufficient coloring is possible.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited only to these examples.

*本願発明の併用特殊ペリレン系顔料 (Test Example 1: Experiment on heat shielding effect of green sample)
(Sample preparation)
Using Extruder, a thickness of 200 μm and a size in which 10 wt% of a green color pigment composition composed of a composite pigment composition of A, B and C shown in Table 1 is kneaded with respect to 90 wt% of polypropylene (hereinafter PP) pellets As a 20 cm square green sample PP plate, heat-shielding pigment A to heat-shielding pigment-colored green PP plate (Comparative Example 1), heat-resistant heat-shielding pigment B to heat-resistant and heat-shielding pigment-colored green PP plate (Example 1), A general pigment-colored green PP plate (Comparative Example 2) was prepared from the general pigment C. Extruder molding temperatures were 200 ° C. and 250 ° C. for each sample, and each PP plate was molded as a sample.

* Combined special perylene pigment of the present invention

(Method for evaluating and measuring heat shielding effect)
As the surface temperature measurement, a thermocouple was attached to the center of the back surface of the sample, and further measurement was performed by thermography. The rise in the surface temperature of the sample by a 250 W infrared irradiation lamp mounted at a height of 30 cm above the sample surface was measured and recorded over time, and the rise history was evaluated.

遮熱性ＰＰ板については、一般ＰＰ板に比して温度上昇履歴の差からその遮熱効果が認められ、また、成型温度である２００℃および２５０℃では、耐熱性遮熱ＰＰ板の方がさらにその効果が大きいことがわかる。このことは本願発明による耐熱遮熱性顔料使用の安定効果が一層顕著であることを示す。 (Experimental result)
The results of measuring the temperature rise in 10 minutes are shown in Table 2-5 and FIGS. 1-4.

About heat insulation PP board, the heat insulation effect is recognized from the difference in the temperature rise history compared with general PP board, and the heat resistant heat insulation PP board is more at 200 ° C. and 250 ° C. as molding temperatures. Furthermore, it turns out that the effect is large. This indicates that the stability effect of using the heat-resistant and heat-insulating pigment according to the present invention is more remarkable.

*本願発明のペリレン系特殊顔料 (Test Example 2: Heat shielding effect experiment of sample adjusted to color other than green)
(experimental method)
With compositions shown in Table 6, heat-resistant and heat-insulating pigment brick-colored PP plates (Examples 2 and 3) were prepared from the pigment compositions D and E, respectively. The PP plate and the heat-shielding pigment-colored green PP plate of Comparative Example 1 of Test Example 1 were compared in temperature rise as in Test Example 1.

* Perylene special pigment of the present invention

レンガ色に調整した耐熱遮熱性顔料組成物においても、通常の遮熱顔料組成物に比して温度上昇が有意に低く、耐熱性のみならず遮熱性に関しても有効である結果が得られた。 (Experimental result)
Table 7 shows the results of measuring the temperature rise in 10 minutes for each pigment composition.

Also in the heat-resistant and heat-insulating pigment composition adjusted to a brick color, the temperature rise was significantly lower than that of a normal heat-shielding pigment composition, and the result was effective not only in heat resistance but also in heat-shielding properties.

(Test Example 3: Physical property test of tensile strength using physical property test sheet)
(Create a sheet)
10 parts by weight of each of pigments A, B, and C prepared in the same manner as in Test Example 1 are mixed with 90 parts by weight of pellet-shaped polypropylene, and the mixture is supplied to a single-screw extruder and molded at a molding temperature of 200 ° C. and 250 ° C. The mixed sheet of Pigment B was Example 4, and the mixed sheets of Pigment A and C were Comparative Examples 3 and 4, respectively. The obtained sheet | seat was extended | stretched so that it might become 6 times the draw ratio on a 130 degreeC heating roll, and it was set as the sheet | seat for a physical property test.

(Physical property test)
The physical properties of the prepared sheet were measured in accordance with JIS K 6251 vulcanized rubber tensile test method. The tensile test was No. 3 dumbbell, the measuring device was Orientec STA-1150, and the measurement speed was 500 mm / sec. Table 8 shows the measurement results.

  The tensile strength test showed that stronger strength was obtained at 250 ° C. for the heat-resistant and heat-insulating pigment. When comparing the heat shielding pigment, the physical property value of the heat shielding pigment was extremely lowered at 250 ° C., but the sheet using the color pigment composition having heat resistance and heat shielding properties of the present invention was improved. This can be considered that the heat-resistant and heat-shielding color pigment composition is greatly involved in the physical property value of the sheet at a high temperature, and is considered to affect the quality of the artificial turf pile.

(Test Example 4: Solar reflectance and tensile strength test by compounding weight part of composite pigment)
(Create a sheet)
1 to 15% of the pigment B prepared in the same manner as in Test Example 1 was mixed with the pellet-shaped polypropylene, and the mixture was supplied to a single screw extrusion molding machine to form a sheet at molding temperatures of 200 ° C and 250 ° C. The obtained sheet | seat was extended | stretched so that it might become 6 times the draw ratio on a 130 degreeC heating roll, and it was set as the sheet | seat for a physical property test.

ペレット状ポリプロピレンへの顔料組成Ｂの配合量は、着色による隠蔽性から光の透過率の低下、遮熱性能の一大因子である日射反射率に反映される。日射反射率は、顔料組成が２ｗｔ％以上で大きく増大し、５ｗｔ％をこえるとほぼ安定して飽和状態となる。一方、シートの引っ張り強度は、顔料組成Ｂの割合が２〜５ｗｔ％の範囲で特に安定し、１２ｗｔ％をこえると大きく低下し、１５ｗｔ％以上では低下がさらに著しい。本検証の結果、顔料組成の添加重量は２〜１２ｗｔ％が適正範囲であることがわかる。 (Sunlight reflectance and tensile strength test)
Table 9 and FIG. 5 show the results obtained by measuring the solar reflectance according to the number of parts by weight of the additive in accordance with JIS A 5759 (1994). Moreover, the tensile strength by the tensile test method of JIS K 6251 vulcanized rubber is shown in FIG.

The blending amount of the pigment composition B into the pellet-shaped polypropylene is reflected in the solar reflectance, which is a major factor in the decrease in light transmittance and the heat shielding performance due to the hiding property due to coloring. The solar reflectance greatly increases when the pigment composition is 2 wt% or more, and when it exceeds 5 wt%, it is almost stably saturated. On the other hand, the tensile strength of the sheet is particularly stable when the ratio of the pigment composition B is in the range of 2 to 5 wt%, greatly decreases when the ratio exceeds 12 wt%, and further decreases when the ratio is 15 wt% or more. As a result of this verification, it is understood that the added weight of the pigment composition is in the proper range of 2 to 12 wt%.

Test example 5: Thermal insulation measurement experiment of artificial grass pavement (paving artificial grass pavement)
MFR (Melt Flow Rate; JIS K7210) = 1.0 / 10 min polypropylene homopolymer (PP-Homopolymer) 80 wt% and linear turf pile molding pellets 100 wt% comprising 100 wt%,

・ Titanium oxide white pigment (Taika JR-1000) 27.5wt%
・ Iron oxide brown pigment (120ED manufactured by Toda Chemical) 7.3
Benzimidazolone yellow pigment (manufactured by Clarian HG-2) 43.2
-Phthalocyanine green pigment (5370S from DIC) 20.7
Perylene black pigment (BAK FK-4280) 1.0

A composite pigment for green consisting of 4.0 wt% was kneaded and blended as a “color pigment composition” having heat resistance and heat shielding properties of the present invention. The resin composition pellets were melted and extruded at a temperature of 230 ° C. to form a film having a thickness of 80 μm, which was further stretched 5 times by a heating roll at 130 ° C. and then split by a splitter to obtain a thickness. An artificial turf pile yarn (63/50, yarn) having a thickness of 75 μm, a width of 2 mm, a fineness of 7500 d, and a tensile strength of 126 N / mm ² was formed. This was planted on a polypropylene base fabric (NWF) and subjected to a backing treatment with a polyurethane resin to produce a long pile artificial turf. Next, this was paved on a base layer paved with asphalt composed of coarse particles (t = 40nn) / dense particles (t = 30) on the roadbed to obtain an artificial turf surface having a size of 3 m × 3 m. It was set to 5. As Comparative Example 5, for the “general heat-shielding colored pigment” of the green artificial turf pile, instead of “perylene-based black pigment” in the composite pigment composition of the present invention, “methiazo-based black pigment” (A-1103 manufactured by Dainichi Seika) In addition, as a comparative example 6, a green artificial turf pile composite pigment composition having no normal heat shielding function,

-Titanium oxide white pigment (Taika JR-1000) 24.7wt%
・ Iron oxide brown pigment (120ED manufactured by Toda Chemical) 3.7
・ Iron oxide brown pigment (manufactured by BASF 3912) 49.4
-Phthalocyanine green pigment (DIC 5370S) 17.3
Iron oxide black pigment (Hoechst 318) 4.9

In the same manner, an artificial grass pavement surface was paved.

通常パイルおよび遮熱パイルに対して、耐熱性遮熱パイルを用いた人工芝の舗装面の温度上昇率が有意に低く、高い遮熱性が得られることを示す。 (Thermal insulation measurement experiment)
A 250W infrared lamp is installed at a height of 50cm above the artificial turf surface with a green hue, and the surface temperature rise history after the start of lighting irradiation on the turf surface is measured with a two-dimensional radiation thermometer (ii-1064 (Inc. HORIBA))). The two-dimensional radiation thermometer has a total of 64 elements, and can measure 64 temperatures. Among them, it is installed so that 9 elements enter the subject of the measurement camera, and the average value of the obtained 9 points temperature As a result, the results shown in the following Table 10 were obtained.

Compared to normal piles and heat shield piles, the rate of temperature increase of the artificial turf pavement using heat-resistant heat shield piles is significantly low, indicating that high heat shield properties can be obtained.

その結果、耐熱性遮熱顔料配合パイルのものと一般遮熱性顔料配合パイルのものとの間においても、同様の遮熱効果が認められた。 (Test Example 6)
Between the long piles planted on the artificial turf pavement surface of Example 5 and Comparative Examples 5 and 6, as a granular material filler, at a height of about 3 to 5 cm from the artificial turf base fabric surface, granular rubber chips (φ = 0.8-2.4) and artificial turf filled with inorganic particulates (silica sand # 5-6) mixed at approximately equal volume ratios were designated as Example 6 and Comparative Examples 7 and 8, respectively. Using this artificial turf, a heat shielding evaluation test was conducted in the same manner as in Test Example 5, and the results shown in Table 11 were obtained.

As a result, the same heat-shielding effect was recognized between the heat-resistant and heat-shielding pigment blended pile and the general heat-shielding pigment-blended pile.

  The artificial turf pile with heat resistance and heat insulation specified in this application and the artificial turf by its manufacturing method are laid in various ground playgrounds, open spaces, walking paths, etc., because the material itself has a heat shielding function. Due to the heat-shielding effect due to the decrease in pavement surface temperature under outdoor hot weather in summer, etc., it contributes to environmental protection and prevention of global warming, such as prevention of heat stroke and sunstroke, etc. during long-time play, etc. It can be deployed to various outdoor gymnasiums with functionality that can be used.

Heat shielding effect comparison (Comparative Example 1 and Example 1, 200 ° C.) Comparison of heat shielding effect (Comparative Example 1 and Example 1, 250 ° C.) Heat shielding effect comparison (Example 1 and Comparative Example 2, 250 ° C.) Thermal insulation effect comparison (Comparative Example 1 and Comparative Example 2, 250 ° C.) Relationship between pigment composition ratio and sunlight reflectance Relationship between pigment composition ratio and tensile strength

Claims (10)

  An artificial turf comprising a colored pigment composition containing a perylene pigment having a heat resistance limit of 250 ° C. or higher and 350 ° C. or lower and a solar reflectance specified in JIS A5759 of 15% or higher and 95% or lower. pile.   2. The artificial turf pile according to claim 1, comprising a color pigment composition containing a perylene pigment having a QUV deterioration upper limit of 2 (ΔE) or less as defined in JIS K5600, 7.8. .   The artificial turf pile according to claim 1 or 2, comprising a color pigment composition containing a perylene pigment having a heat resistance of 250 ° C or higher and 350 ° C or lower as defined in DIN. EN12877.   The composition other than the perylene pigment of the color pigment composition is composed of a pigment selected from those having a heat limit of 250 ° C. or higher and 1100 ° C. or lower and a solar reflectance specified in JIS A5759 of 15% or higher and 95% or lower. The artificial turf pile according to any one of claims 1 to 3.   The composition other than the perylene pigment of the color pigment composition is composed of a pigment selected from those having a QUV deterioration upper limit of 2 (ΔE) or less as defined in JIS K5600, 7.8. The artificial turf pile according to any one of the above.   The composition other than the perylene pigment of the color pigment composition is composed of a pigment selected from those having a heat resistance of 250 ° C to 1100 ° C as defined in DIN. EN12877. The artificial turf pile according to any one of the above.   The composition other than the perylene pigment of the color pigment composition is composed of a pigment selected from any of titanium oxide, iron oxide, phthalocyanine, imidazolone, monoazo-disazo condensate, dioxazine, and quinacridone. The artificial turf pile according to any one of claims 1 to 6.   The artificial turf pile according to any one of claims 1 to 7, wherein the artificial turf pile contains a total of 1 to 15% by weight of a coloring pigment composition with respect to the raw material of the artificial turf pile.   The artificial turf pile according to any one of claims 1 to 8, wherein the content of the perylene pigment in the colored pigment composition is 0.5 to 10% by weight. The method for producing an artificial turf pile according to any one of claims 1 to 9, wherein the raw material kneaded with the color pigment composition is melted and extruded at a temperature of 190 to 250 ° C.

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