KR100799262B1 - An environmental-friendly in-fill material composition for artificial turf - Google Patents

Abstract

An environmentally friendly filler composition for artificial lawn, a method for preparing an environmentally friendly filler by using the composition, and an environmentally friendly filler prepared by the method are provided to improve environmental friendliness by using no heavy metal such as lead, mercury, chromium and cadmium, and no volatile organic compound and by generating no dust. An environmentally friendly filler composition comprises 10-20 wt% of styrene-ethylene.butadiene-styrene(SEBS); 5-20 wt% of an olefin-based elastomer selected from the group consisting of propylene homopolymer, modified polypropylene, and modified polyethylene; 25-40 wt% of a paraffin-based or paraffin-naphthene-based mineral oil; 40-55 wt% of at least one filler selected from the group consisting of calcium carbonate and talc; 0.5-1.0 wt% of weather resistant selected from the group consisting of a UV stabilizer, a UV screening agent and an oxidizing agent; and 0.10-0.15 wt% of an inorganic pigment.

Description

Filling composition for eco-friendly artificial turf {AN ENVIRONMENTAL-FRIENDLY IN-FILL MATERIAL COMPOSITION FOR ARTIFICIAL TURF}

The present invention relates to a filler composition for environmentally friendly artificial turf. The present invention also relates to an environmentally friendly artificial grass filler.

In artificial turf for sports, the filler is planted in the ground tissue as a means to absorb the impact of the athlete and to secure a series of proper performances such as ball rolling, splashing, and speed change after the ball is bound to the ground. A material filled between artificial turf yarns.

International Patent Publication Nos. WO2005 / 124028 and 2007-0041688 describe "particulate fillers for artificial turf made of renewable synthetic materials, and include flame retardants, antistatic agents, hydrophilic additives, and oil-containing additives. , Granular fillers for artificial grass to which an algae and the like are added. The granular filler for artificial turf has the advantage of improving the playability of artificial turf by the addition of various additives, but has the disadvantage that various additives such as flame retardants as well as synthetic materials, which are the main raw materials, may be harmful to the human body. Korean Registered Utility Model Publication No. 413557 describes, `` Football artificial turf in which silica sand with a particle diameter of 0.3-1.0 mm and an EPDM (ethylene-propylene-diene monomer) chip or a SBR (styrene-butadiene rubber) chip having a particle size of 0.6-2.5 mm are sequentially stacked. Dragon filler ”. However, in the case of SBR, the four heavy metals, volatile organic compounds (VOCs), polycyclic aromatic hydrocarbons, etc. are generated due to the use of various crosslinking agents containing sulfur (S). Although it may be a material, it is problematic in terms of stability of raw material supply due to its high price. Korean Utility Model Publication No. 94-22765 discloses that "filling material for installing artificial turf mixed with sand, a mica of 1 to 3 mm in diameter and a rubber of 1 to 3 mm in proportion of 60 to 70: 15 to 25: 10 to 20. Is disclosed. The filling material for installation for artificial turf has various bulk density according to the composition of components and cannot satisfy playability such as shock absorbency and vertical strain certified by FIFA, and shear stress is applied. At this time, mica, which is a lamellar lamellar structure, changes flat and the ground may be hardened.

On the other hand, natural rubber materials are suitable for artificial turf in consideration of the harmlessness of human body, continuous expression of physical properties, stability of raw material supply, and ease of expression of appropriate playability. There is a difficulty in supply and demand, and there is a limit to commercialization.

It is harmless to the human body because it does not cause the generation of four heavy metals (lead, mercury, hexavalent chromium and cadmium), volatile organic compounds (VOC), dust, etc., and also has tensile strength, tear strength, hardness, and elongation (elongation). It is aimed to provide environmentally friendly fillers for artificial turf that can be stably maintained, have no risk of loss in rainy weather, provide stability and cost reduction of raw material supply, and facilitate the development of appropriate economic performance.

The present invention comprises 10 to 20% by weight of styrene-ethylenebutadiene-styrene (SEBS); 5-20 wt% of an olefinic elastomer selected from the group consisting of homo polypropylene (homo PP), modified polypropylene (modified PP) and modified polyethylene (modified PE); 25-40% by weight of paraffinic or paraffinic-naphthenic mineral oils; 40 to 55% by weight of at least one filler selected from the group consisting of calcium carbonate and talc; 0.5 to 1.0% by weight of one or more weathering agents selected from the group consisting of ultraviolet stabilizers, sunscreen or ultraviolet absorbers, and antioxidants; And it relates to an environmentally friendly artificial grass filler composition comprising 0.10 to 0.15% by weight of inorganic pigments.

Styrene-ethylene butadiene-styrene (SEBS) is a material capable of realizing the physical properties most similar to natural rubber, absorbs paraffinic or paraffinic-naphthenic mineral oil, and has compatibility with olefin elastomers. Styrene-ethylene butadiene-styrene (SEBS) provides elasticity and elastic recovery, and since itself is a block structure serves to prevent the formation of crosslinking during compounding (compounding). Styrene-ethylenebutadiene-styrene (SEBS) is a three-dimensional structure consisting of ethylene butadiene soft segments connected between styrene hard segments at both ends and heavy segments. Styrene-ethylene butadiene-styrene (SEBS) has a two-phase structure in which hard and soft segments are phase separated. The styrene hard segment is a crystalline region which is not mixed with the ethylene butadiene soft segment, which is an amorphous region, forms physical crosslinks at room temperature, imparts mechanical properties (eg, tensile strength), and has a glass transition temperature (Tg) of about 100. ℃. In contrast, the ethylene butadiene soft segment is a hydrophobic amorphous region that absorbs mineral oil, and has a glass transition temperature (Tg) of about -55 占 폚. Phase separation between the styrene hard segment and the ethylene butadiene soft segment is due to different solubility parameters (styrene-9.1, ethylene butadiene -7.76), and the degree of phase separation affects mechanical properties, rheological properties, heat resistance, etc. It is advantageous. The content of styrene-ethylene butadiene-styrene (SEBS) is preferably 10 to 20% by weight. In addition, styrene-ethylene butadiene-styrene (SEBS) can also contain ethylene vinyl acetate (EVA).

Examples of olefinic elastomers compatible with styrene-ethylenebutadiene-styrene (SEBS) include homo polypropylene, modified polypropylene, modified polyethylene, and the like. As used herein, the term "modification" refers to a copolymer. For example, using a Ziegler catalyst (Ziegler-Natta) catalyst to increase the ethylene content to about 15% by using a non-crystalline area to give the elastomer properties polypropylene-polyethylene copolymer can be used. Olefin elastomers are relatively inexpensive materials exhibiting physical properties close to that of natural rubber, but not as much as styrene-ethylene butadiene-styrene (SEBS), and are essential for extrusion operation and expression of certain forms. In addition, the olefin elastomer can impart mechanical properties and surface softness, improve heat resistance, and lower the content of SEBS, which is relatively expensive. The content of the olefin elastomer is preferably 10 to 20% by weight.

Mineral oils aid in the homogeneous mixing of styrene-ethylene-butadiene-styrene (SEBS), olefinic elastomers and fillers (calcium carbonate and / or talc) to avoid disproportionation of physical properties. In addition, since mineral oil acts as an extender / filler, the cost of the finished product can be lowered, and the properties of the finished filler can be changed in various properties such as tensile strength, hardness, resilience, and dispersion of filler. It absorbs and dissipates heat, speeds up the mixing of other ingredients, reduces energy consumption, and lowers the viscosity to create a texture similar to natural grass. Without mineral oil, the surface of the filler will be rough, causing unpleasant feelings when the filler touches the athlete's skin and, in severe cases, a burn hazard. The mineral oil is preferably paraffinic mineral oil or paraffin-naphthenic mineral oil, and most preferably paraffinic mineral oil. Paraffin-based mineral oils improve the flow and color stability of the filler. The content of paraffinic or paraffinic-naphthenic mineral oil is preferably 25 to 40% by weight.

The filler is preferably at least one member selected from the group consisting of calcium carbonate (CaCO ₃ ) and talc, most preferably calcium carbonate. The filler serves to secure the stability of the finished product filler and to increase oil absorbency. The content of the filler is preferably 40 to 55% by weight.

Styrene-ethylenebutadiene-styrene (SEBS) does not require the addition of antioxidants, ozone inhibitors, ultraviolet stabilizers, etc., but it is preferred to use small amounts of weathering agents for the protection of other components. The weathering agent is preferably at least one member selected from the group consisting of ultraviolet stabilizers, sunscreen agents and antioxidants. Examples of ultraviolet stabilizers include poly [[6-[(1,1,3,3-tetramethylbutylamino) -1,3,5-triazine-2,4-diyl]-[4- (2,2 , 6,6-tetramethyl-piperidyl) imino] hexamethylene [4- (2,2,6,6-tetramethylpiperidyl) imino]]. Examples of the sunscreen agent include 2 -(2H-benzotriazol-2-yl) -4,6-bis (1-methyl-1-phenylethyl) phenol, and examples of antioxidants are N, N'-hexamethylene-bis- ( 3,5-di-tert-butyl-4-hydroxyhydrocinamide) can be mentioned. The content of the weathering agent is preferably 0.5 to 1.0% by weight. For example, when the content of calcium carbonate as a filler is 50% by weight or more, the addition of weathering agents of less than 100,000 ppm is meaningless.

Inorganic pigments serve to express the desired color by coloring. The inorganic pigment may be any known in the art, and the content of the inorganic pigment is preferably 0.10 to 0.15% by weight.

The eco-friendly artificial grass filler composition may further include 0.05 to 0.5% by weight of sustained-release microparticles exhibiting at least one of aromaticity, hydrophilicity, and antibacterial and deodorant properties. When external force is applied such as shear stress, vertical impact, and the athlete is subjected to load and pressure during the race, the sustained-release particles are gradually released. The fragrance component creates a pleasant game environment, the hydrophilic component keeps the filler in rainy weather, and doubles the drainage effect in addition to the natural surface drainage effect due to the gradient of the artificial underlayer. Has an antibacterial and / or deodorant effect. The aromatic component is preferably at least one selected from the group consisting of rosemary oil, wormwood oil, strawberry oil, jasmine oil, green tea oil, lemon oil, baby powder oil, lavender oil and pine oil; The hydrophilic component is preferably at least one selected from the group consisting of ethylene vinyl alcohol copolymers, polyhydroxyethyl methacrylates, polyvinylmethyl ether / maleic anhydride copolymers, polyacrylamides, and acrylamide / acrylic acid copolymers. To; Antibacterial and deodorant components include Ag-zeolite, Ag-alginate, pine needle extract, phytoncide extract, green tea extract, ginkgo biloba extract, echochocho extract, herbal extract, licorice extract, aloe extract, triticale extract, pine extract, clove oil extract, rosemary oil It is preferably at least one selected from the group consisting of sage oil, lavender oil, grapefruit seed extract.

On the other hand, the physical properties of the environmentally friendly filler composition for artificial turf according to the increase of the content of the olefin elastomer (particularly, homo polypropylene), mineral oil (particularly, paraffinic mineral oil) and filler (particularly, CaCO ₃ ) is shown in the following table. It is shown in 1.

Homo Polypropylene Paraffinic mineral oil CaCO ₃ The tensile strength        ↑         ↓        → Elongation Rate        ↓         ↑        → Tensile stress        ↑         ↓        ↗ Hardness        ↑         ↓        ↗ Tear strength        ↑         ↓        ↗ importance        ↗         ↓        ↑ Melt flow index        ↗         ↑        ↓ Machinability        ↑         ↑        ↗

↑: increase ↓: decrease ↗: increase slightly ↘: decrease slightly →: almost unchanged

In addition, the present invention is a manufacturing method of environmentally friendly artificial turf filler, after preparing and extruding the above-mentioned environmentally friendly artificial turf composition by physical mixing, it is cut and pulverized in water to form elliptical particles It provides a way to.

In addition, the present invention is an eco-friendly artificial turf filler prepared according to the above-described method for manufacturing an environmentally friendly artificial turf filler, an average diameter of 1.5 ~ 3.0mm, the shape of the eco-friendly artificial turf filler, characterized in that the elliptical or spherical shape. To provide. This eco-friendly artificial grass filler has a specific gravity of 1.1 to 1.6 g / cm 3 and a bulk density of 0.6 to 0.9 kg / l. As the specific gravity of the filler is greater than 1.6 g / cm 3, the amount of filler required per unit area of the artificial grass increases, resulting in a cost burden. If the specific gravity of the filler is less than 1.1 g / cm 3, there is a high risk of loss in rain.

Environmentally friendly filler for artificial turf of the present invention does not cause the generation of four heavy metals (lead, mercury, hexavalent chromium and cadmium), polycyclic aromatic hydrocarbons (PAHs), volatile organic compounds (VOCs), dust, etc. Not only harmless, but also stable physical properties such as tensile strength, tear strength, hardness, elongation (elongation), there is no risk of loss in rainy weather, the stability and cost reduction of raw material supply can be obtained, and the appropriate performance This is an easy advantage.

Through the following examples will be described in more detail the present invention. However, the following examples are only for illustrating the present invention, and the scope of the present invention should not be construed as being limited to the following examples. Accordingly, one of ordinary skill in the art to which the present invention pertains (so-called "man skilled person" or "average skilled person") is not limited to various modifications of the following examples within the scope of the technical idea derived from the matters described in the appended claims. It will be appreciated that modifications and applications are possible.

Example  A

Compositions and physical properties of the environmentally friendly filler composition for artificial turf of Examples 1 to 5 are shown in Table 2 below.

Example 1 Example 2 Example 3 Example 4 Example 5   Remarks Modified PP or modified PE 15 wt% 15 wt% 10 wt% Homo PP 20 wt% 20 wt% Paraffinic mineral oil 25 wt% 25 wt% 25 wt% 25 wt% 25 wt% CaCO ₃ 50 wt% 50 wt% 45 wt% 45 wt% 40 wt% SEBS 10 wt% 10 wt% 10 wt% 10 wt% 20 wt% Inorganic pigments 0.12 wt% 0.12 wt% 0.12 wt% 0.12 wt% 0.12 wt% UV stabilizer 0.03 wt% 0.03 wt% 0.03 wt% 0.03 wt% 0.03 wt% Sunscreen 0.02 wt% 0.02 wt% 0.02 wt% 0.02 wt% 0.02 wt% Antioxidant 0.01 wt% 0.01 wt% 0.01 wt% 0.01 wt% 0.01 wt% Sustained-release particulate 0.5 wt% 0.5 wt% Tensile Strength (Kgf / ㎠) 62.777 59.6 to 63.2 54.148-54.6 48.498-50.622 Lower than Example 1 Example 5 caused an error because the elongation was too high. Elongation (%) 850 750-762 351.69-396.13 349.76-371.50 Higher than Example 1 importance 1.33 1.33 1.28 1.28 Shore A 37-38 38-39 84 84

* The content is based on the total weight of the composition, the content of inorganic pigments and weathering agents (ultraviolet stabilizer, sunscreen and antioxidant) is based on the content of paraffinic mineral oil.

* Test measurement standard: KS C 3094

* Hardness measurement is based on reading the reading by placing the specimen on a 10 mm or more position and pressing Manual Shore A for 5 seconds.

* In general, the lower the hardness, the lower the tensile strength and the higher the elongation.

Example  B

After preparing and extruding an eco-friendly artificial grass filler composition mainly comprising 5.9 wt% of homopolypropylene, 29.4 wt% of paraffinic mineral oil, 50 wt% of calcium carbonate (CaCO ₃ ) filler, and 14.7 wt% of SEBS, The physical property test results for the samples of environmentally friendly artificial turf filler prepared by cutting and grinding to form elliptical particles are shown in Table 3 below.

Test Items unit Sample X Sample Y How to measure Hardness Shore a 42 44 ASTM D 2240 The tensile strength Kgf / ㎠ 13.75 14.16 ASTM D 638 Elongation Rate % 685 825 ASTM D 638 importance 1.20 1.30 ASTM D 792

Example  C

Table 4 shows the results of tests on the harmlessness of the human-friendly artificial turf filler for the present invention.

         Test Items  unit Standard standard   Test result     Test Methods  Pb          Mg / kg  90 or less pass  KS R 1301: 2006  Cadmium (Cd)  50 or less pass  Mercury (Hg)  25 or less pass USEPA 3052: 1996 Test Equipment: ICP-AES Hexavalent chromium (Cr ^{6 +} )  25 or less pass USEPA 3060A: 1996 Test Equipment: UV-Visible Spectrophotometer Polycyclic aromatic hydrocarbons Benzo (a) pyrene      below 10 pass      USEPA 8100: 1986 Benzo (e) pyrene pass Benzo (a) anthracene pass Chyrene pass Benzo (a) fluoranthene pass Benzo (j) fluoroanthene pass Benzo (k) fluoranthene pass Dibenzo (a, h) anthracene pass Volatile Organic Compounds benzene    50 or less pass    USEPA 5021: 1996 toluene pass Ethylbenzene pass xylene pass

* Standard specification of benzene in T-VOCs is 1 mg / kg or less.

As can be seen from Table 4, in the environmentally friendly artificial turf filler of the present invention four heavy metals (lead, mercury, hexavalent chromium and cadmium), polycyclic aromatic hydrocarbons (PAHs), volatile organic compounds (VOCs) Etc. was not detected, and thus, the eco-friendly artificial grass filler of the present invention is harmless to the human body.

Claims (7)

10 to 20% by weight of styrene-ethylenebutadiene-styrene (SEBS); 5 to 20% by weight olefinic elastomers selected from the group consisting of homo polypropylenes, modified polypropylenes and modified polyethylenes; 25-40% by weight of paraffinic or paraffinic-naphthenic mineral oils; 40 to 55% by weight of at least one filler selected from the group consisting of calcium carbonate and talc; 0.5 to 1.0% by weight of one or more weathering agents selected from the group consisting of UV stabilizers, sunscreen agents and antioxidants; And Filler composition for an environmentally friendly artificial turf comprising an inorganic pigment 0.10 to 0.15% by weight. The method of claim 1, An environmentally friendly filler composition for environmentally friendly artificial turf, further comprising 0.05 to 0.5% by weight of sustained-release microparticles containing an aromatic component, a hydrophilic component, and an antibacterial and deodorant component. The method of claim 2, The aromatic ingredient is at least one selected from the group consisting of rosemary oil, wormwood oil, strawberry oil, jasmine oil, green tea oil, lemon oil, baby powder oil, lavender oil and pine oil; The hydrophilic component is at least one selected from the group consisting of ethylene vinyl alcohol copolymers, polyhydroxyethyl methacrylates, polyvinylmethylether / maleic anhydride copolymers, polyacrylamides, and acrylamide / acrylic acid copolymers; Antibacterial and deodorant components include Ag-zeolite, Ag-alginate, pine needle extract, phytoncide extract, green tea extract, ginkgo biloba extract, echochocho extract, herbal extract, licorice extract, aloe extract, triticale extract, pine extract, clove oil extract, rosemary oil Environmentally friendly filler composition for artificial turf, characterized in that at least one selected from the group consisting of sage oil, lavender oil, grapefruit seed extract. The method of claim 1, The ultraviolet stabilizer is poly [[6-[(1,1,3,3-tetramethylbutylamino) -1,3,5-triazine-2,4-diyl]-[4- (2,2, 6,6-tetramethyl-piperidyl) imino] hexamethylene [4- (2,2,6,6-tetramethylpiperidyl) imino]] and the sunscreen is 2- (2H-benzo Triazol-2-yl) -4,6-bis (1-methyl-1-phenylethyl) phenol and the antioxidant is N, N'-hexamethylene-bis- (3,5-di-tert-butyl -4-hydroxyhydrocinamide), an environmentally friendly filler composition for artificial turf. As a manufacturing method of eco-friendly artificial grass fillers, Method for preparing an environmentally friendly artificial turf composition according to any one of claims 1 to 4 by physical mixing, extruding, cutting and pulverizing in water to form elliptical or spherical particles. . As an environmentally friendly artificial grass filler prepared according to the method of claim 5, Filler particles have an average diameter of 1.5 to 3.0mm, the shape of the eco-friendly artificial grass filler, characterized in that the elliptical or spherical shape. The method of claim 6, An eco-friendly artificial grass filling material, characterized by a specific gravity of 1.1 to 1.6 g / cm 3 and a bulk density of 0.6 to 0.9 kg / l.