KR101980371B1 - Environmentally friendly artificial turf yarn modified by plasma treatment and artificial turf structure using the same - Google Patents

Abstract

The present invention relates to artificial turf yarn, which is environmentally friendly by utilizing bio-polyethylene instead of non-regenerated fossil fuel, and is capable of preventing burn caused by frictional heat as well as realizing the effect of reducing the surface temperature and generating static electricity due to an increase in the water content by modifying the surface of artificial turf yarn to be hydrophilic through plasma treatment; and an artificial turf structure utilizing the same.

Description

TECHNICAL FIELD [0001] The present invention relates to an artificial turf yarn, and more particularly, to an environmentally friendly artificial turf yarn modified by plasma treatment and an artificial turf structure using the same,

The present invention can be applied to biofuels instead of non-regenerated fossil fuels, and is also environmentally friendly. In addition, the surface of artificial turf yarn can be modified to have hydrophilicity through plasma treatment, so that static electricity generation and surface temperature reduction effect can be realized The present invention relates to an artificial turf yarn and an artificial turf structure utilizing the same.

Artificial turf is designed to mimic the characteristics and uses of natural turf and is developed to overcome the limitation of supply and management problems due to the increase of demand of natural turf. In recent years, various kinds of sports such as soccer field, baseball field, Construction of a playground for public use, construction of public spaces such as kindergartens, hotels, department stores, schools, etc., or living rooms such as verandas, terraces, and gardens.

The artificial turf has a buffering effect to mitigate the impact on the body and a movement enhancing effect to improve the movement force, which cuts off the radiant heat generated from the concrete, etc., and continuously gives a green feeling of stability. , And cleaning is easy.

Generally, artificial turf is formed by arranging artificial turf structure made by planting artificial turf yarns of various kinds of plastic resin in a file form on the road surface to form artificial turf field. The artificial turf structure is composed of artificial turf files, And the elastic pavement which is the substructure of artificial grass. The artificial grass pile serves as grass, and the filler includes granular material such as rubber or natural material to fix the pile of grass pile and give elasticity of artificial grass, The packaging material is disposed below the artificial turf structure to mitigate the impact.

Conventional artificial turf yarns are made from non-regenerative petroleum or natural gas (petroleum plastics or p-plastics), polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), polystyrene (PS), nylon, poly (PC), polyvinyl chloride (PVC), and the like. However, the plastic resin has a problem in that, due to the finite consumption of the underground resources, the plastic resin is contaminated with environmental pollution There is a problem that it can cause a problem.

In addition, as described above, the artificial turf yarn based on a plastic resin has characteristics such as the degree of crushing and breakage due to the deterioration of the tensile strength of the yarn due to long-term use and cumulative number of times of use, The cost of rehabilitation or reinstallation is repeatedly incurred according to the arrival of time. Artificial turf is wasted huge budget because it is classified as a national project due to the characteristics of physical education facilities.

Particularly, in the case of artificial turf yarns such as soccer and field hockey, and in the case of "contact sports" in which the user 'actual contact occurs with the human body, And the permanent compressibility of the artificial turf yarn is increased, so that the restoring force is remarkably lowered. As a result, the damage of the head portion It has a problem causing injury to human body.

In order to solve the above problems, there has been developed a method of changing the shape and material of a filler filled in an artificial turf yarn or artificial turf, and further a structural change of the artificial turf structure to lower the surface temperature. However, There is little effect of reducing the amount of water, and a problem of durability due to repeated use is caused.

In addition, there has been attempted to solve the problem of static electricity by coating antistatic agent on artificial turf yarn or adding it to raw material. However, as the durability of coating on the surface of artificial turf yarn is weak and the use frequency is increased, There is a problem in that the problem is not solved due to the fact that a certain amount of the raw material of the yarn is mixed and added and the effect thereof is insufficient. Therefore, a study is needed to overcome the above problems.

Korean Patent No. 10-1009390

A problem to be solved by the present invention is to provide an environmentally friendly artificial turf yarn using bio-polyethylene instead of non-regenerated fossil fuel.

Another object to be solved by the present invention is to provide a novel non-regenerative fossil fuel which is environmentally friendly and utilizes biofuels instead of non-regenerated fossil fuels, and which has excellent antistatic properties capable of reducing frictional heat and static electricity generated by friction between a synthetic turf yarn and a human body Friendly artificial turf yarn.

Another object to be solved by the present invention is to provide an antistatic material which is eco-friendly by utilizing bio-polyethylene instead of non-regenerated fossil fuel, and has an antistatic property capable of reducing frictional heat and generation of static electricity caused by friction between an artificial turf yarn and a human body It is intended to provide a method for coating an artificial turf yarn with an antistatic agent having low durability or a method of adding raw materials.

In order to solve the above problems, the eco-friendly artificial turf source according to the present invention comprises a resin containing 5 to 10 parts by weight of silica beads per 100 parts by weight of a mixture of a bio-polyethylene resin and a polyolefin resin, And is a hydrophilic eco-friendly artificial turf source.

In one aspect of the present invention, an artificial turf yarn molded article is produced by extruding a mixture containing a bio-polyethylene resin (Bio-PE resin), a silica bead, and a polyolefin resin, The present invention also provides a method of manufacturing an artificial turf yarn characterized in that an artificial turf yarn molded article is plasma-treated to be hydrophilic.

In the present invention, the bio-polyethylene resin may be produced by fermenting starch or sugar, which can be obtained from vegetable raw materials such as corn, sugarcane, and sweet potato, with microorganisms to produce bio-ethanol, dehydrating bio- The obtained bio-polyethylene is a synthetic material prepared by using natural vegetable starch or sugar instead of a non-regenerated raw material such as petroleum or natural gas.

In the practice of the present invention, the bio-polyethylene may be commercially available from I Brassem, Brazil's BIO-PE I'M GREEN ^TM .

In particular, the bio-polyethylene can reduce carbon dioxide by 70% or more to 26-28% of the petroleum-based polyethylene in terms of greenhouse gas emissions, thereby reducing climate change and ecosystem toxicity and reducing petroleum resources. It is an eco-friendly material that has superiority over petroleum-based polyethylene resin. It is easily decomposed by microorganisms in nature and does not adversely affect the environment. Since it has the same function (strength, water resistance, molding processability, heat resistance) Polyethylene can be substituted.

Preferably, the bio-polyethylene resin is 0.930 to may be used having a 0.965 g / molecular weight distribution (Mw / Mn) of the density, and 2 to 3.5 range cm ^3, the density of the bio polyethylene resin than 0.930 g / cm ³ The lower the tensile strength of artificial turf yarn is, the lower the product strength. If it is higher than 0.965 g / cm ³ , the artificial turf yarn will have much lint. When the molecular weight distribution of the bio-polyethylene resin is less than 2, low molecular weight components are less distributed and a large number of high molecular weight components are present, which causes a problem that a non-uniform layer is formed on the yarn during extrusion. The elongation of the artificial turf yarn is lowered and the strength is lowered.

In the present invention, the polyolefin resin contained in the polymer mixture is a synthetic polymer compound produced by polymerization of an olefin which is a chain-like hydrocarbon compound having one double bond, and is mixed with the bio-polyethylene resin, And examples of the polyolefin include polyethylene, polypropylene, polyethylene-propylene copolymer, polyisobutylene, and the like. Preferably, the polyolefin resin is a polyethylene resin having excellent processability. The polyethylene resin may be a linear low-density polyethylene (LLDPE), a low-density polyethylene (LDPE), a medium-density polyethylene (MDPE), a high-density polyethylene (HDPE) Or a mixed resin thereof may be used. In the practice of the present invention, the polyethylene resins can be used that has a density of 0.930 to about 2 to 3.5 and a molecular weight distribution in the range (Mw / Mn) of 0.965 g / cm ^3.

In the present invention, the silica beads contained in the polymer mixture have excellent bonding strength with the polyolefin resin and the bio-polyethylene resin, and include not only a large amount of fine pores but also maximize the tensile strength of the artificial turf for sports facilities and landscaping And at the same time, it does not need to add an antistatic agent separately and acts to suppress the generation of static electricity by the material itself, and may be added in the form of liquid, resin, or powder.

The artificial turf yarn including the silica beads as described above can prevent a part of the image due to friction when the user is active on the surface of artificial turf grass and the pile restoring force is excellent through the material, The slip phenomenon can be alleviated and the impact of the yarn can be buffered and dispersed to prevent breakage or breakage of the yarn and the deterioration due to the rapid temperature change can be suppressed due to the cold resistance and the heat resistance and the lifetime of the synthetic turf yarn can be increased For this purpose, the silica beads may have an average particle diameter of 1 to 10 micrometers, preferably 5 to 10 micrometers.

When the content of the silica beads is less than the above range, the hydrophilic modification effect is lowered. If the content of the silica beads is more than the above range, the strength, for example, the impact strength may be lowered. In addition, even when the particle diameter of the silica beads is larger than the above range, the physical properties, such as strength, impact strength, tensile strength, bending strength, etc., of the polyethene resin may be lowered by the silica beads If the particle diameter of the silica bead is less than the above range, the effect of the introduction of the silacer for hydrophilic modification may be deteriorated.

In the present invention, the bio-polyethylene and the polyethylene resin mixture may comprise 20 to 80% by weight of bio-polyethylene and 20 to 80% by weight of polyethylene, preferably 30 to 70% by weight of bio- 30 to 70% by weight of polyethylene, more preferably 40 to 60% by weight of bio-polyethylene, and 40 to 60% by weight of polyethylene.

Preferably, the bio-polyethylene resin and the polyethylene resin mixture may have a melting index (MI) in the range of 5 to 40 g / 10 min. When the melt index of the bio-polyethylene resin and the polyethylene resin mixture is 5 g / 10 minutes, the flowability is low, so that the pressure of the artificial turf yarn is increased and the yarn can not be manufactured. When the artificial turf yarn is larger than 40 g / 10 min, the elongation of the artificial turf yarn is lowered.

The silica beads dispersed in the fine grooves formed on the surface of the polymer resin by the plasma treatment are interconnected by hydrophilizing the hydrophilic silica beads in a state in which the inorganic silica beads are dispersed in the organic polymer resin composed of the bio-polyethylene resin and the polyolefin resin, Can be improved.

The artificial turf yarn according to the present invention is produced by extruding the melt of the polymer mixture in a state in which the polymer mixture is melted as described above, thereby manufacturing an artificial turf yarn molded body, plasma-treating the produced artificial turf yarn body, The artificial turf yarn has a surface modified to have hydrophilicity through plasma treatment and a large amount of fine pores are formed therein. In addition, because of the silica beads containing a large amount of fine pores, The water content is rapidly increased, so that the static electricity generation and the surface temperature reduction effect can be realized, and the image due to the frictional heat can be prevented.

Specifically, the surface of the artificial turf yarn molded article exhibits hydrophobicity and is inferior in hygroscopicity. As a result, the surface temperature increases due to sunlight and static electricity easily occurs.

In the present invention, by modifying the artificial turf yarn molded article as described above by modifying it by plasma treatment, the chemical surface modification by the physical surface modification and the generation of the polar functional group cuts off the molecular bond on the surface of the artificial turf yarn and activates, The pores can be formed and the surface can be modified to impart hydrophilicity.

The artificial turf yarn molded article having the surface modified by the plasma treatment as described above can adsorb a large amount of moisture, thereby reducing the generation of static electricity and frictional heat, and preventing the surface temperature from rising sharply due to sunlight do.

The plasma treatment may be an atmospheric pressure glow discharge, a corona discharge, a dielectric barrier discharge, a microwave discharge, or the like. More specifically, It may be carried out by using air plasma processing, chemical plasma processing, flame plasma processing, or the like, and preferably by using an air plasma processing method .

In particular, the air plasma forms neutrons by blowing atmospheric air through high voltage electrodes, and forms polarized ion particles through electrical discharge. When such particles contact the surface of artificial turf yarn molded body, The surface of the artificial turf yarn molded body is made to have a surface energy higher than that of water to effectively wet the surface of the artificial turf yarn molded body so that the water is uniformly flowed The adhesive force can be increased and improved while maximally contacting the surface of the material.

For example, the artificial turf yarn may be modified to hydrophilize the surface using an air plasma treatment method, and the artificial turf yarn molded body may be placed in a container containing argon, neon, helium, nitrogen, It is possible to introduce oxygen or a functional group such as a hydroxyl group into the artificial turf yarn formed body by irradiating the surface of the material with air or oxygen plasma by irradiating the plasma generated by the discharge. When the inert gas such as argon or neon is present at a low pressure, the surface of the artificial turf yarn molded article is attacked by the generated plasma, and radicals are generated on the surface thereof and exposed to air, A hydrophilic functional group can be introduced into the material surface.

Further, in the present invention, the time for treating the air plasma may be 10 seconds to 10 minutes, preferably 10 seconds to 8 minutes. In the artificial grass yarn molded article thus treated with the air plasma, the contact angle of water is remarkably reduced, So that it can be absorbed.

In the present invention, the polymer blend of the artificial turf yarn may further include at least one member selected from the group consisting of a polyolefin functional additive, a conductive material, a colorant, and a flame retardant.

The polyolefin functional additive may be exemplified by thermoplastic polyurethane (E-TPU). Such a functional additive may form an olefin block copolymer, thereby enhancing the functionality of the bio-polyethylene resin and the polyethylene resin It is possible to remarkably improve performance and durability by greatly increasing tearing, torsional resistance, cutting and tear resistance as well as giving excellent elastic restoring force of synthetic turf yarn, and preferably 5 to 10 parts by weight of the polymer blend The thermoplastic polyurethane can be used with particles having an average particle size of 5 to 10 mm.

The polyolefin functional additive may have a melting index (MI) in the range of 5 to 40 g / 10 min. When the melt index of the polyolefin functional additive is lower than 5 g / 10 min, It is impossible to produce the yarn because the pressure is increased when the artificial turf yarn is manufactured. If it is larger than 40 g / 10 min, the elongation of the synthetic turf yarn is lowered.

Examples of the conductive material include copper, aluminum, silver, and the like. The conductive material as described above not only imparts deodorizing and antibacterial properties to artificial turf yarns, but also inhibits the inflow of human bodies of images and fine materials through prevention of static electricity, It is possible to prevent the filling material from being leaked after the structure is installed. The conductive material may be mixed in an amount of 1 to 10 parts by weight per 100 parts by weight of the polymer mixture.

For this purpose, the artificial turf structure manufactured using the artificial turf yarn to which the conductive material is added is preferably reinforced by adding conductive carbon to the bottom of the artificial turf structure for effective discharge of static electricity, By increasing the hydrophilicity of the surface, the surface temperature can be lowered and the material can be preserved in the form of a neutron to prevent contamination adherence, deterioration and discoloration.

The colorant may be a pigment, a dye or the like. It is preferably a pigment in consideration of the compatibility with components such as a polyolefin resin and the aesthetics of artificial turf yarn as a final molded product. The content of the colorant is not limited And may be mixed in a proportion of 1 to 10 parts by weight per 100 parts by weight of the polymer mixture.

The polymer mixture for producing the artificial turf yarn may further include a flame retardant. The flame retardant may be a phosphorus flame retardant, a metal hydrate flame retardant, a halogen flame retardant, a flame retardant aid, or a mixture thereof. The flame retardant may be mixed in a proportion of 0.1 to 10 parts by weight per 100 parts by weight of the polymer mixture.

The polymer blend for making the artificial turf yarn may further comprise a compatibilizer, wherein the compatibilizer is selected from the group consisting of maleic acid, maleic anhydride, maleic acid hydrazide, dichloromaleic anhydride, unsaturated dicarboxylic acid, Citric acid, citric acid, citric acid anhydride, malic acid, agaricinic acid, or a mixture thereof. The above-mentioned compatibilizer may be included to improve dispersibility and bonding properties and to reduce whitening of artificial turf yarns .

The artificial turf yarn according to the present invention is eco-friendly by using bio-polyethylene instead of non-regenerated fossil fuel, and its surface is modified to be hydrophilic by plasma treatment, so that hygroscopicity is remarkably increased, and excessive frictional heat and static electricity The occurrence can be reduced.

The artificial turf yarn according to the present invention is modified to be hydrophilic while ensuring environment friendliness due to the use of bio-polyethylene, thereby relieving a frictional image and deterioration in heat resistance due to artificial turf characteristics. Further, the present invention provides a method for effectively producing such artificial turf yarns.

FIG. 1 is a 5,000 times SEM photograph showing the surfaces of (a) Comparative Example 1 and (b) Example 1 of the present invention.
2 is a view showing the roughness measurement results of the surface of (a) Comparative Example 1 and (b) Example 1 of the present invention.
3 is a view showing the surface measurement results of (a) Comparative Example 1 and (b) Example 1 of the present invention.
4 is a cross-sectional view of a construction site of artificial turf according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to examples. The embodiments presented are only a concrete example of the present invention and are not intended to limit the scope of the present invention.

Example  One

50 parts by weight of Bio-polyethylene having a density of 0.940 g / cm ³ and a molecular weight distribution (Mw / Mn) of 200,000 and a molecular weight distribution (Mw / Mn) of 2.1 (190 ° C, 21.6 kg, ASTM D1238) and g / density cm ³ and the polyethylene 50 parts by weight having a molecular weight distribution (Mw / Mn) of 220,000 with a molecular weight and 2.0, the average mixed particle diameter of 5 microns silica beads 5 parts by weight of T-PEU 5 parts by weight To prepare a polymer mixture. The prepared mixture was heated to prepare a mixed melt, and the resulting mixed melt was extruded to produce a 0.5 mm diameter artificial turf yarn shaped body.

The manufactured artificial grass filament formed body was charged into a glow discharge machine having a molybdenum (Mo) anode and a copper (Cu) cathode, an applied frequency of 1 kHz, a discharge voltage of 360 V and a discharge current of 12 mA and a needle type tip, To produce a hydrophilic synthetic turf yarn by modifying the surface of the artificial turf yarn molded article by air plasma treatment.

Example  2

0.950 g / cm ³ and a density of 250,000 molecular weight (Mw) to the MI 15g / 10 bun having a molecular weight distribution of 2.2 (Mw / Mn) of the (190 ℃, 21.6 kg, ASTM D1238) Bio- polyethylene and 50 parts by weight, 0.942 and g / density cm ³ and the polyethylene 50 parts by weight having a molecular weight distribution (Mw / Mn) of 220,000 with a molecular weight and 2.0, the average mixed particle diameter of 5 microns silica beads 5 parts by weight of T-PEU 5 parts by weight To prepare a polymer mixture. The prepared mixture was heated to prepare a mixed melt, and the resultant mixed melt was extruded to produce an artificial turf yarn molded product having a diameter of 0.5 mm.

Example  3

0.960 g / molecular weight distribution of the density and the 300,000 molecular weight (Mw) of 2.3 cm ³ MI 20g / 10 bun having a (Mw / Mn) (190 ℃ , 21.6 kg, ASTM D1238) Bio- polyethylene and 50 parts by weight, 0.942 and g / density cm ³ and the polyethylene 50 parts by weight having a molecular weight distribution (Mw / Mn) of 220,000 with a molecular weight and 2.0, the average mixed particle diameter of 5 microns silica beads 5 parts by weight of T-PEU 5 parts by weight To prepare a polymer mixture. The prepared mixture was heated to prepare a mixed melt, and the resultant mixed melt was extruded to produce an artificial turf yarn molded product having a diameter of 0.5 mm.

Example  4

50 parts by weight of Bio-polyethylene having a density of 0.940 g / cm ³ and a molecular weight distribution (Mw / Mn) of 200,000 and a molecular weight distribution (Mw / Mn) of 2.1 (190 ° C, 21.6 kg, ASTM D1238) and g / density cm ³ and the polyethylene 50 parts by weight having a molecular weight distribution (Mw / Mn) of 220,000 with a molecular weight and 2.0, the average mixed particle diameter of 6 micrometers, the silica beads 8 parts by weight of T-PEU 5 parts by weight To prepare a polymer mixture. The prepared mixture was heated to prepare a mixed melt, and the resultant mixed melt was extruded to produce an artificial turf yarn molded product having a diameter of 0.5 mm.

Example  5

50 parts by weight of Bio-polyethylene having a density of 0.940 g / cm ³ and a molecular weight distribution (Mw / Mn) of 200,000 and a molecular weight distribution (Mw / Mn) of 2.1 (190 ° C, 21.6 kg, ASTM D1238) and g / density cm ³ and the polyethylene 50 parts by weight having a molecular weight distribution (Mw / Mn) of 220,000 with a molecular weight and 2.0, the average mixed particle diameter of 10 six microns silica bead parts by weight of T-PEU 5 parts by weight To prepare a polymer mixture. The prepared mixture was heated to prepare a mixed melt, and the resultant mixed melt was extruded to produce an artificial turf yarn molded product having a diameter of 0.5 mm.

Comparative Example  One

50 parts by weight of Bio-polyethylene having a density of 0.940 g / cm ³ and a molecular weight distribution (Mw / Mn) of 200,000 and a molecular weight distribution (Mw / Mn) of 2.1 (190 ° C, 21.6 kg, ASTM D1238) g / cm < ³ >, 50 parts by weight of polyethylene having a molecular weight of 220,000 and a molecular weight distribution (Mw / Mn) of 2.0 were mixed to prepare a polymer mixture. The prepared mixture was heated to produce a mixed melt. The mixed melt was extruded to produce a 0.5 mm diameter artificial turf yarn shaped body without glow discharge treatment.

Comparative Example  2

Except that the glow discharge treatment was not performed in Example 1.

Comparative Example  3

Except that 15 parts by weight of silica was used in Example 1.

result

(One) Surface roughness  analysis

The surface roughness of the artificial turf yarns prepared in Example 1 and Comparative Example 1 was analyzed by a scanning electron microscope to analyze the surface roughness. The SEM analysis result is shown in Fig. 2, and the change in the polarity of the surface was analyzed. 3. As shown in FIG. 2 and FIG. 3, as in Comparative Example 1, the artificial turf yarn without surface treatment has a smooth surface structure and a low surface polarity. On the other hand, as in Example 1, the surface roughness and surface polarity of the artificial turf yarn of Example 1 produced by air plasma treatment were significantly increased.

(2) Confirmation of surface modification

In order to confirm the surface modification of the synthetic turf yarn prepared by the method according to Example 1, the surface of artificial turf yarns according to the examples and comparative examples was analyzed by Fourier transform infrared spectroscopy, The results are shown in Fig.

As shown in FIG. 4, hydrophilic functional groups were not found in the artificial turf yarns prepared by the method according to the comparative examples. However, in the artificial turf yarns prepared by the method according to the examples, the functional groups such as carboxyl groups were recognized and the surface was modified And that it exhibits hydrophilicity.

(3) Absorption rate measurement

The absorption rates of artificial turf yarns according to Examples 1 to 5 and Comparative Examples 1 to 3 were analyzed. The absorption rate test was conducted in a similar manner to ASTM D570. First, the artificial turf yarn is dried in an oven at 50 ° C for 24 hours, immediately cooled in a desiccator and immediately weighed. After that, artificial turf yarn is dipped in water at 73.4 ° F (23 ° C) for 24 hours or more, Wipe the specimen with a cloth and immediately weigh. The difference in weight obtained here is expressed in%. The absorption rate of the modified artificial turf yarn was increased.

sample Moisture content (%) Example 1 4.5 Example 2 4.3 Example 3 4.0 Example 4 5.0 Example 5 5.8 Comparative Example 1 0.0 Comparative Example 2 0.5 Comparative Example 3 6.0

(4) Contact angle  Measure

Distilled water was dropped onto the surface of the manufactured artificial turf yarn using a micro needle, and the contact angle was measured. The contact angle of the modified artificial turf yarn was lowered.

sample Contact angle (°) Example 1 35 Example 2 37 Example 3 38 Example 4 32 Example 5 30 Comparative Example 1 80 Comparative Example 2 75 Comparative Example 3 32

(5) Measurement of physical properties

The prepared artificial turf materials were used to fabricate specimens and their physical properties were measured. If the silica content is excessive, the strengths are reduced.

Item The tensile strength Elongation Impact strength Example 1 220 700 48 Example 2 225 710 49 Example 3 240 720 48 Example 4 215 690 47 Example 5 210 680 47 Comparative Example 1 230 750 50 Comparative Example 2 220 740 47 Comparative Example 3 180 500 35

Tensile strength (kg / cm2) -ASTM D638

Elongation (%) - ASTM D638

IZOD impact strength (Notch, 23 캜) kg-cm / cm ASTM D256

(6) Stadium construction

As shown in FIG. 4, the artificial turf structure includes a drainage layer 1; Base layer 2; A bubble layer 3; An artificial turf layer comprising artificial turf piles 4 and a back coat 5, and a filling layer 6.

Specifically, the drainage layer is a layer provided on the upper surface of the road surface in order to prevent drainage and freezing, and may be selected from non-frozen materials that do not contain clay, bed aggregate, slag or a mixture thereof such as clay, silt and organic impurities .

The material to be used for the formation of the drainage layer should be such that the percentage of the passing weight of the 4.75 mm sieve is in the range of 30 to 70% and the content of the material passing through the 75 μm sieve is not more than 15% , The maximum grain size of the particles should not exceed 100 mm, and the drainage layer should be uniformly applied after compaction so that the thickness of one layer does not exceed 20 cm.

The base layer serves as a foundation layer for laying a file composed of the artificial turf yarn, and is installed on the drainage layer and serves to uniformly support a load acting on the artificial turf layer. Concrete, or asphalt concrete, and the aggregate, concrete, or asphalt concrete can be installed according to the installation environment. .

The bubble layer may be formed by forming a synthetic turf yarn by tufting, lacer, or the like to form an artificial grass filament on the base layer, and may be a nonwoven fabric made of a material such as polyethylene or polypropylene. It is preferable to use a polypropylene nonwoven fabric for stability.

The artificial turf layer includes a synthetic turf pile fixedly formed on the bubble layer and a back coating layer formed on the back surface of the bubble layer to back coat the artificial turf pile so as to prevent the artificial turf pile from being lost, , The back coating layer may be formed of a thermosetting resin including styrene butadiene rubber latex, polyurethane (PU), polyethylene (PE) or a mixture thereof on the upper surface of the foam layer, ethylene A filler such as an ethylene propylene diene monomer (EPDM) rubber chip, a sericite, a filler such as zeolite powder, and the like.

The filling layer is formed by filling a filler between the piles for improving the fitness and providing functionality, and a mixture of granules, soil, silica sand, etc. containing the natural cork powder in the thermoplastic resin may be used as the filler. For example, the filling layer may include a powder layer formed of a filler having an average particle size of 0.1 to 3 mm to maintain the artificial grass pile upright and to improve productivity and functionality, And an elastic layer formed of a chip filler of an elastic chip having a thickness of 1 to 5 mm and retaining the raised state of the pile and absorbing impacts due to use.

The artificial turf structure as described above is environmentally friendly by using bio-polyethylene instead of non-regenerated fossil fuel, and the surface is modified to be hydrophilic by plasma treatment, so that hygroscopicity is remarkably increased to reduce excessive frictional heat and static electricity generated by friction of human body By including artificial turf yarns that can be used, it can be utilized for artificial turf formation in various athletic fields, and the operating cost can be reduced due to durability improvement and frictional heat reduction.

Claims (11)

A resin comprising 5 to 10 parts by weight of silica beads per 100 parts by weight of a mixture of a bio-polyethylene resin and a polyolefin resin, wherein the extruded surface is modified with a plasma,
Here, the bio-polyethylene has a density ranging from 0.930 to 0.965 g / cm 3 and a molecular weight distribution (Mw / Mn) ranging from 2 to 35,
The polyolefin resin is a polyethylene resin, and
Wherein the modification is a modification in which a functional group containing oxygen is introduced into the extruded surface by a plasma. The method according to claim 1,
Wherein the bio-polyethylene (PE-PE) and the polyethylene resin mixture are composed of 20 to 80% by weight of bio-polyethylene and 20 to 80% by weight of polyethylene. The method according to claim 1,
Wherein the silica beads have an average particle diameter of 5 to 10 mu m. The method according to claim 1,
The polyolefin resin may be a linear low-density polyethylene (LLDPE), a low-density polyethylene (LDPE), a medium-density polyethylene (MDPE), a high-density polyethylene (HDPE) And a mixed resin thereof. ≪ RTI ID = 0.0 > 11. < / RTI > The method according to claim 1,
Wherein the polyethylene resin and the bio-polyethylene resin have a melt index (MI) of 5-40. The method according to claim 1,
Further comprising 5 to 10 parts by weight of a polyolefin functional additive, 1 to 10 parts by weight of a conductive material, 1 to 10 parts by weight of a colorant and 0.1 to 10 parts by weight of a flame retardant with respect to 100 parts by weight of a mixture of a bio-polyethylene resin and a polyethylene resin Artificial turf yarn. The method according to claim 1,
Wherein the polyolefin functional additive is a thermoplastic polyurethane having a diameter of 0.01 to 10 mm. The method according to claim 1,
Characterized in that the surface of the artificial turf yarn molded article is modified by an air plasma treatment process, Wherein the bio-polyethylene has a density ranging from 0.930 to 0.965 g / cm < 3 > and a molecular weight distribution ranging from 2 to 35 (Mw / Mn), wherein the polyolefin resin is produced by extruding a mixture of a polyethylene resin to produce an artificial grass yarn molded article, and the surface of the artificial turf yarn molded article is modified by plasma treatment to produce a hydrophilic yarn Method of manufacturing yarn. 10. The method of claim 9, wherein the plasma treatment is an air plasma treatment to blow atmospheric air in a glow discharge machine. 9. An artificial turf structure comprising the artificial turf yarn of any one of claims 1 to 8.

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