KR20080102067A - Composition as artificial turf fiber and fiber using the same - Google Patents

Abstract

A composition for artificial turf yarn and yarn using the same are provided to have tensile strength, weatherproof, abrasion resistance and upstanding feature as implementing soft feel like natural grass. In a composition for artificial turf yarn and yarn using the same, the composition ratio of the medium density polyethylene and linear low density polyethylene is 80:20 or 20:80. In the linear low density polyethylene, the melt index is 1.8 to 2 and the density is 0.915 to 0.920. In the medium density polyethylene, the melt index is 0.5 to 0.6 and the density is 0.935 to 0.940. At least one of pigment, absorbent, UV stabilizer, antioxidant and the silicone additive is selected/added to the composition for artificial turf yarn.

Description

Composition for artificial turf yarn and yarn using the same {Composition as Artificial turf fiber and fiber using the same}

1 is a yarn form of fibrillates according to one embodiment of the present invention.

2 is an FT-IR spectrum according to an embodiment of the present invention.

3A and 3B are DSC data according to an embodiment of the present invention.

Figure 4 is a SEM photograph of the fibrillate film according to an embodiment of the present invention.

Figure 5 is a SEM picture of the fibrillates in accordance with a preferred embodiment of the present invention.

The present invention relates to artificial turf, and in particular, to provide artificial turf yarn composition and yarn using the same.

Stadium turf requires ground cover such as stadium genetic density, wear resistance that can withstand damage during competition, regeneration and elasticity that can be recovered quickly after damage, and a long green period. It must also be visually uniform to give visitors a sense of simplicity and comfort.

Grass having the above characteristics is largely used in various ways to suit the natural grass and artificial grass.

The natural grass is grown and trimmed by growth, grows naturally by natural resources such as photosynthesis and water, contains sufficient moisture, and is textured and cushioned, so it is safe from the risk of injury, and the scratches caused by friction when slipped There is almost no.

In general, artificial grass is a grass that is produced by planting various resins in the form of pile yarn in bubble paper, and it is a substitute for natural grass, which is artificially shaped as a grass and can always maintain blue color and is not limited by environmental conditions. However, its use is limited because it is inferior in texture to natural grass.

However, in recent years, fibrill (small fiber) is used as a material close to natural grass to reduce friction, which minimizes the splashing of the filler, and evenly spreads the entire flatness of the ground even when the use period is long. Technology was developed in such a way that there would be little.

Since the yarn conditions are determined according to the durability and orientation of the raw material itself, the raw material for artificial turf and its composition are very basic and important factors.

Therefore, as the molecular weight of the resin used as a raw material increases, physical properties such as tensile strength, impact strength, tear strength, environmental resistance and the like increases.

In addition, the density of the resin also plays an important role, and as the density increases, the initial modulus increases, but the moisture content decreases to have stiffness characteristics, and as the density decreases, it is flexible and has transparency, impact strength, tear strength, resistance to The environment is increased.

As described above, the key to selecting and synthesizing a resin suitable for the characteristics of turf is dependent on the molecular weight and density of the resin.

As the raw material resin used for such artificial turf yarn, polyvinylidene chloride, polyethylene, nylon, polypropylene, and the like were used.

In Japanese Patent Laid-Open No. 2006-070438, according to 100 parts by weight of thermoplastic resin, 1 to 20% by weight of graft copolymer composed of 55 to 95% by weight of olefin polymer segment and 5 to 45% by weight of vinyl polymer segment. It has been proposed a pile for artificial turf, characterized in that the composition consisting of parts and 0.5 to 15 parts by weight of fatty acid amide.

However, the vinyl polymer has a disadvantage in that toxic gas is generated upon incineration after use, and the polypropylene used above has poor weather resistance and is hard to be fibrous, and thus has a stiff touch.

Therefore, the raw material resin mainly used to overcome the above disadvantages is a branched polyethylene-based, in particular linear low density polyethylene (LLDPE) or medium density polyethylene (MDPE) is used alone.

However, if the artificial turf is composed only of LLDPE, it is difficult to secure proper toughness, and thus the uprightness of the yarn is insufficient when the grass is planted.

The MDPE is similar in density and molecular weight to high density polyethylene (HDPE), but has properties different from those of HDPE.

The HDPE is polymerized using a Ziegler-Natta catalyst, but MDPE is polymerized with a metallocene catalyst, which is less stiff than HDPE and has excellent wear resistance, heat resistance, and environmental resistance.

Even if the polyethylene has the same molecular weight, the polyethylene has the same molecular weight, depending on whether the branch has a long or large number of branches, the compact property is reduced, the volume is increased, the density is reduced, the physical properties according to the same molecular weight, Flexibility is increased.

For this reason, as the length of the branch becomes longer than that of the branchless ethylene, the density decreases by having butyl, hexyl, and octyl branches.

Therefore, the LLDPE having the octene branch is low in density but relatively high in molecular weight than LDPE, and has excellent soft and wear resistance.

Thus, Japanese Patent Application Laid-Open No. 2007-016367 consists of a composition of 70 to 95% by weight of a high density polyethylene and 5 to 30% by weight of an ethylene-α-olefin copolymer having a density of 0.90 to 0.925 g / cm ³ by a metallocene catalyst. Pile grass for artificial turf has been proposed.

HDPE has a toughness for the artificial turf pile yarn prepared above, and the ethylene-α-olefin copolymer having a density of 0.90 to 0.925 g / cm ³ by a metallocene catalyst exhibits soft characteristics.

However, although the HDPE is composed as a main component, the uprightness of the pile is increased, but it is insufficient to give a soft touch of natural grass.

In order to solve the above problems, an object of the present invention comprises a linear low-density polyethylene and a medium-density polyethylene, but artificial turf-based composition showing a soft touch similar to natural grass at the same time as the physical properties, such as upright, excellent wear resistance and weather resistance And to provide a yarn using the same.

In order to achieve the above object, the present invention provides an artificial turf yarn-use composition and an artificial turf yarn-use composition comprising a linear low density polyethylene and a medium density polyethylene in a predesigned composition ratio.

In another aspect, the present invention provides a composition for artificial turf yarn composition characterized in that the composition ratio of the linear low density polyethylene and the medium density polyethylene is 80:20 to 20:80.

In addition, the present invention is artificial turf fiber composition characterized in that the melt index of the linear low density polyethylene is 1.8 to 2.0, the density is 0.915 to 0.920, the melt index of the medium density polyethylene is 0.5 to 0.6, the density is 0.935 to 0.940 To provide.

In addition, the present invention provides an artificial turf yarn composition comprising at least one selected from pigments, absorbents, ultraviolet stabilizers, antioxidants or silicone additives to the artificial turf yarn composition.

In addition, the present invention provides a composition for artificial turf yarn, characterized in that the pigment is added 5 to 10 parts by weight based on the composition 100.

In addition, the present invention provides an artificial turf yarn-use composition, characterized in that 5,000 to 10,000 ppm is added to the UV stabilizer based on 1 kg of the composition.

In addition, the present invention provides an artificial turf-based composition, wherein the antioxidant is added to 500 to 1,000 ppm based on 1 kg of the composition.

In addition, the present invention provides a yarn using an artificial turf yarn composition, which is formed in a fibrillate form using the above composition in a yarn using an artificial turf yarn composition.

In addition, the present invention, the fibrillated form of the fibrillate film has a width of 10 to 14 mm, a thickness of 100 to 150 ㎛, the fibrillates in the longitudinal direction of 0.5 to 1.5 mm per fiber width Yarn using artificial turf yarn composition, characterized in that 3 to 7 cuts per width (cut), two repeating units in the longitudinal direction, the number of twist is a fibrillated yarn of 30 to 40 twists / inch To provide.

In addition, the present invention, using a yarn of the above, permeable ascon base layer or a pile of mono-denier yarns in the range of 200 to 500 of the fibrillate and polyamide material on the top of the crushed ground in a 1: 1 alternating bubble layer. To 30 to 70 mm by a tufting method, the density of the pile is provided by tufting a total of 13,000 to 22,000 pieces / m ² in the horizontal X length.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in the drawings, the same components or parts denote the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

As used herein, the terms "about", "substantially", and the like, are used at, or in close proximity to, numerical values as are indicative of preparation and material tolerances inherent in the meanings mentioned, and are intended to be accurate or to facilitate understanding of the invention. Absolute figures are used to prevent unfair use by unscrupulous infringers.

The requirements for artificial turf yarns are not only physical properties such as abrasion resistance, UV stability and high tear strength, compression recovery and toughness, but also low sliding resistance, as well as the feel and softness of natural turf. It includes.

Yarn for artificial turf according to a preferred embodiment of the present invention is a fibrillated form consisting of a linear low density polyethylene (LLDPE) and medium density polyethylene (MDPE) composition of the ratio that can exhibit the optimum physical properties and feel for grass .

The fibrillate is stretched to a certain extent so that molecules can be oriented in a polymer film, and then twisted under a certain tension to be converted into a thread or a twine, which may be torn or easily separated in the longitudinal direction. It refers to the form of the fiber having a structure capable of.

In the artificial turf fiber composition, first, the linear low density polyethylene is LLDPE with octene branch having a melt index of 1.8 to 2.0 and a density of 0.915 to 0.920, and the MDPE has a melt index of 0.5 to 0.6 and a density of 0.935 to 0.940. desirable.

 In addition, the composition ratio of the composition is preferably LLDPE and MDPE is 80:20 to 20: 80% by weight. In particular, it is more preferable when the composition ratio is 70: 30% by weight.

Outside the above range, the touch or physical properties are not satisfactory in the use of artificial turf.

The LLDPE has a hexyl branch in the molecular structure, and has a low crystallinity compared to high density polyethylene (HDPE), thereby lowering the rigidity of the yarn but having a soft touch and maintaining wear resistance.

Artificial turf is essential for filling operations such as silica sand and rubber granules, so the MDPE supplements the collapsing properties resulting from the flexibility of the LLDPE to ensure filling workability and product appearance with the uprightness of the pile.

Therefore, LLDPE shows the soft emotional properties of the grass, and MDPE can supplement the appearance and physical properties of the grass can be produced artificial turf similar to natural grass.

In addition to the raw material, one or more selected from pigments, UV stabilizers, antioxidants or silicone additives may be added.

The pigment is preferably added 5 to 10 parts by weight based on 100 parts by weight of the composition for imparting color, such as natural grass.

The UV stabilizer serves as a weather resistant reinforcement to prevent the production of amine, which is a yarn decomposition promoting material during ultraviolet irradiation, 5,000 to 10,000 ppm is preferably added based on 1 kg of the composition of the designed ratio.

In addition, the antioxidant prevents the yarn from being embrittled by heat to improve the heat resistance, it is preferably added to 500 to 1,000 ppm based on 1 kg of the composition.

In addition, the silicone resin may be added to improve the processability of the extrusion or injection process and the soft touch of the yarn after the raw material composition.

When it is out of the range added to the raw material for artificial turf, it is greatly deviated from the characteristics required for grass not only in excellent durability and tear strength and toughness but also soft touch.

Fibrillates can be produced in the following form in accordance with the above composition ratio.

1 is a yarn form of the fibrillate according to an embodiment of the present invention.

The width of the fibrillate film is preferably 10 to 15 mm, the thickness is extruded to 100 to 150 ㎛.

Further, when separating the fibrillates in the longitudinal direction, the width per fiber is 0.5 to 1.5 mm, 3 to 7 cuts per width, 2 repeating units in the length direction, and the number of twists is 30 to Preferred is a fibrillate form of 40 twists / inch.

When the thickness of the film is less than 100 ㎛ and the width of each fibrillate when cutting the film is less than 0.5 mm, the applied erectivity of the artificial grass is lowered, the thickness of the film exceeds 150 ㎛, each skin when the film is cut If the width of the relation exceeds 1.5 mm, the feel of the artificial turf may be stiff.

The artificial turf is formed as described below using the yarn.

First, a mono-denier yarn in the range of 200 to 500 of the fibrillate and polyamide material is formed on the permeable ascon base layer or the crushed ground on a one-to-one basis. Let's do it. The pad layer may be formed on the ascon base layer or the crushed stone.

The pile has a density of 13,000 to 22,000 pieces / m ² in total length and width to complete the artificial turf.

If the pile density is out of the above range, the expression of elastic recovery property is not satisfactory, so it is not suitable for application to stadium turf.

Example  One

(1) Fibrillated yarn composition for artificial turf

700 g of octene-clad LLDPE having a melt index of 1.8 to 2.0 and a density of 0.915 to 0.920, 300 g of MDPE having a melt index of 0.5 to 0.6 and a density of 0.935 to 0.940, 7,500 ppm of UV stabilizer, oxidation Fibrillated yarns were prepared by adding 750 ppm of inhibitor.

(2) fibrillate yarn form

1 is a yarn form of a monofilament according to an embodiment of the present invention.

The width of the fibrillate film is 12 mm, the thickness is 100 to 130 ㎛, when separating the fibrillates in the longitudinal direction is 1 mm for each fiber, 5 cuts per width (cut), A total of 12 repetitions in two repeat units in the longitudinal direction were made in the form of fibrillates having a twist number of 30 to 40 twists / inch.

(2) artificial turf conditions

The fibrillate and polyamide-6 mono-denier yarns (2,200 denier / 8 filaments) in the range of 250 to 300 (1,200 denier and 8 filaments) were formed on the water-permeable ascon base layer at 55 mm in the bubble layer. (Tufting method). The pile was piled up to 18,623 pieces / m ² in total length and width.

Example  2

In the same manner as in Example 1, in the fibrillated yarn composition was composed of 800 g LLDPE, 200 g MDPE.

Example  3

As in Example 1, the fibrillated yarn composition was composed of LLDPE 200 g, MDPE 800 g.

Example  4

As in Example 1, the fibrillated yarn composition was composed of LLDPE 300 g, MDPE 700 g.

Example  5

As in Example 1, the fibrillated yarn composition was composed of 500 g LLDPE, 500 g MDPE.

Comparative example  One

As in Example 1, the fibrillated yarn composition was only composed of 1,000 g of HDPE.

Comparative example  2

As in Example 1, but the fibrillate yarn composition was only composed of 1,000 g MDPE.

Comparative example  3

In the same manner as in Example 1, in the fibrillated yarn composition, fibrillated yarn was prepared by adding 6,000 ppm of UV stabilizer and 2,000 ppm of antioxidant to a composition composed of only 1,000 g of butene-branched LLDPE.

Test Methods

1. Composition Analysis

(1) infrared absorbance (FT-IR)

In order to confirm the structure of the composition consisting of LLDPE and MDPE it was confirmed by measuring the reflectance by the ATR method with a Varian scimator 1,000 spectrometer.

2 is an FT-IR spectrum result according to an embodiment of the present invention.

In Figure 2 it was confirmed that the main functional group made of polyethylene composition as shown in the CH stretch 2,950 cm ^-1 , bending 1,460 cm ^-1 , 1,375 cm ^-1 , 725 cm ^-1 peak.

(2) Differential Scanning Calorimeter (DSC)

TA Instrument Q200 was used as the DSC to confirm the melting point and crystallization temperature of the composition according to an embodiment of the present invention. The temperature was calibrated with indium and zinc, and the sample was secondly heated to 20 ° C / min by cooling to 10 ° C / min after the first heating from 40 ° C to 200 ° C.

Figure 3a and Figure 3b is a DSC data results according to an embodiment of the present invention, Figure 3a shows the melting point of the composition of the present invention, LLDPE and MDPE at an intermediate temperature between LLDPE (120 ℃) and HDPE (130 ℃) It was confirmed that the melting point of the composition was 124.09 ° C.

In addition, it was confirmed that the crystallization temperature is shown at 113.44 ℃ as shown in Figure 3b.

2. Morphological Analysis of Fibrillates

(1) Scanning Electron Microscope (SEM)

In order to confirm the form and size of the fibrillates prepared through the above examples, the samples were pretreated with a platinum-palladium coating and measured at high resolution 5 kv with HITACHI S4700 FE-SEM.

In addition, the analysis mode was measured at 15 kv with a HORIBA EX-250 Energy Dispersive X-ray microanalysis (EDX) mounted on the apparatus for component analysis and trace mineral component detection.

Figure 4 is a SEM picture of the fibrillate film according to an embodiment of the present invention.

The fibrillated film may be separated and manufactured in a fibrillated form, and then used as a yarn for artificial turf.

Figure 5 is a SEM picture of the fibrillates in accordance with a preferred embodiment of the present invention.

The fibrillate has a thickness and shape suitable for artificial turf yarn in the form of a rod having a cross section width of 100 to 130 μm.

In addition, the EDX results of the composition according to Example 1 of the present invention are as follows.

TABLE 1

element weight (%) C 98.11 Pb 1.89 all 100.00

As a result of the above, the composition is mostly composed of carbon (C) which is an element of polyethylene, and is composed of a trace amount of lead (Pb) of about 1.89%.

In the artificial turf composition, the heavy metal content of 3% or less is good for showing the turf effect, and the content shows satisfactory conditions in the artificial turf composition.

3. Physical property analysis

(1) Denier, tensile strength, elongation: KS K 0409

(2) weather resistance

Tensile strength and elongation were measured every 300/500/700 / 1,000 hours in filament after spinning at a dose of 0.55 W / M (total number of piles) at 89 ° C X 50 RH under Xenon-Weather O-Meter.

 (3) wear resistance

Collect at least three round specimens of approximately 130 mm in diameter, drill a 6 mm diameter hole in the center and place them on the sample holder with the specimen surface facing upward in the abrasion strength tester. Using the H-38 wheels, rotate and rub about 3,000 times at 70 rpm against the direction of rotation of the specimen.

Weight reduction measures the friction loss and displays the average of up to three significant figures.

% Wear = {(weight before test (g)-weight after test (g)) / weight before test (g)} X 100

(4) the feel of the fibrillate

The feeling of touching the hands of ten inspectors in textile research is evaluated as follows.

(Double-circle): Softness, (triangle | delta): Slightly soft, x: Stiffness.

TABLE 2

As a result of Table 2, the more the LLDPE content, the lower the tensile strength and elongation, but the softer the wear resistance and the touch, the better the physical properties as the MDPE content increases.

In addition, it can be confirmed that the composition of LLDPE and MDPE is excellent in weather resistance.

Considering the strength reduction rate and elongation stability for artificial turf, Example 5 is the optimum condition, but the touch was not soft, it was confirmed that Example 1 had the optimal composition as a fibrillate composition for artificial turf.

As described above, the artificial turf yarn composition according to the embodiment of the present invention and the yarn using the same are composed of LLDPE and MDPE in a pre-designed ratio to exhibit a soft touch like natural grass, but also have tensile strength, weather resistance, abrasion resistance, and uprightness. It works.

In addition, by adjusting the ratio and the composition ratio of the fibrillates there is an effect that can be used for various purposes by using the characteristics represented by the composition of the present invention by processing not only artificial grass but also other forms.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

Claims (10)

In the artificial turf yarn composition and the yarn using the same, A composition for artificial turf yarns comprising a linear low density polyethylene and a medium density polyethylene in a predesigned composition ratio. The method of claim 1, Composition composition of the artificial turf grass is characterized in that the composition ratio of the linear low density polyethylene and medium density polyethylene is 80:20 to 20:80. The method of claim 1, Linear low density polyethylene has a melt index of 1.8 to 2.0, the density is 0.915 to 0.920, the medium density polyethylene has a melt index of 0.5 to 0.6, the density is 0.935 to 0.940, the artificial turf fiber composition. The method of claim 1, wherein Artificial turf yarn-use composition, characterized in that at least one selected from pigments, absorbents, UV stabilizers, antioxidants or silicone additives is added to the artificial turf-use composition. The method of claim 4, wherein The pigment is artificial turf yarn composition, characterized in that 5 to 10 parts by weight based on the composition 100 is added. The method of claim 4, wherein The UV stabilizer artificial turf yarn composition, characterized in that 5,000 to 10,000 ppm is added based on 1 kg of the composition. The method of claim 4, wherein The antioxidant is artificial grass-based composition, characterized in that 500 to 1,000 ppm is added based on 1 kg of the composition. In the yarn using the artificial turf yarn composition, The yarn using the artificial turf yarn composition, characterized in that formed in the fibrillate form using the composition according to any one of claims 1 to 7. The method of claim 9, The fibrillate form of the fibrillate film has a width of 10 to 14 mm, a thickness of 100 to 150 ㎛, the fibrillates in the longitudinal direction of 0.5 to 1.5 mm per fiber width, 3 to per width Yarn using artificial turf yarn composition, characterized in that the seven cuts, two repeating units in the longitudinal direction, the number of twist is a fibrillated yarn of 30 to 40 twists / inch. Using the yarn according to any one of claims 8 to 9, A mono-denier yarn in the range of 200 to 500 of the fibrillate and polyamide material is formed on the permeable ascon base layer or the crushed ground by 1: 1 alternating, and the pile layer is formed by the tufting method of 30 to 70 mm. The pile is artificial turf, characterized in that formed by tufting a total of 13,000 to 22,000 pieces / m ² in the horizontal and vertical.

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