KR101569489B1 - menufacturing method of filling material for a green artificial grass - Google Patents

Abstract

More particularly, the present invention relates to a method for producing a filler for environmentally friendly artificial turf, which does not contain heavy metals, polycyclic aromatics and VOCs, has excellent moisturizing power, generates little static electricity by friction, Antifungal and elasticity, and the like.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of manufacturing a filling material for an artificial turf,

More particularly, the present invention relates to a method for producing a filler for environmentally friendly artificial turf, which does not contain heavy metals, polycyclic aromatics and VOCs, has excellent moisturizing power, generates little static electricity by friction, Antifungal and elasticity, and the like.

2, an aggregate layer 30 made of aggregate is formed on the ground 40, natural rubber (NR), styrenebutadiene rubber (SBR), IIR An elastic layer composed of a mixture of an isobutylene isoprene rubber, NBR (Nitrile Butadiene Rubber), EPDM (Ethylene Propylene Terpolymers), a vulcanized rubber rubber chip 21 of urethane and a resin adhesive 22 such as a polyurethane resin or an epoxy resin 20 and a plurality of artificial turf piles 11 are planted on the floor mat 14 on the upper side of the elastic layer 20 so as to sandwich the artificial turf piles 11 between the vulcanized rubber chips 12, 13 are filled with an artificial turf layer 10.

Conventional rubber chips for artificial turf filling use a vulcanized rubber chip or a reclaimed rubber chip obtained from a waste tire. Therefore, when the rubber chips are filled in artificial turf, there arises a problem that the synthetic rubber smells badly on the artificial turf Further, when using a waste tire reclaimed rubber chip, there is a problem of smell of waste tire in artificial turf.

In order to solve this problem, Korea Patent No. 10-1400101 discloses a process for producing a coke oven which comprises 23 wt% of SEBS material, 10 wt% of EVA, 54 wt% of calcium carbonate, 3 wt% of coffee sludge, By weight, 1% by weight of stearic acid, 0.5% by weight of wax, 5% by weight of white oil and 0.5% by weight of pigment. Add the prepared materials to the mixer and mix them into the mixer with prepared SEBS material, EVA (EVA), 1/2 of improved calcium carbonate, coffee sludge, cork powder, stearic acid, wax, white oil and pigment A first step of mixing for about 15 minutes, a first step of mixing the remaining calcium carbonate 1/2 into a mixer, and a second step of mixing for 5 minutes, and a second step of mixing and extruding the mixed material into an extruder, A third step of extruding the extrudate so as to have a plurality of elastic wings on the outer periphery and having a hole in the elastic wings; A fourth step of cutting the extrudate to a size of 2.5 mm in water; A fifth step of putting the cut rubber chips into a dehydrator and dehydrating them and cooling them at room temperature; The method comprising the steps of: (a) preparing a synthetic rubber composition for artificial grass;

However, the registered patent has a problem that there is a risk of injury due to frictional force because of insufficient elasticity.

1. Korean Patent No. 10-1400101 2. Korean Patent No. 10-1323706 3. Korean Patent No. 10-1354590 4. Korean Patent Publication No. 10-2011-0087622

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a polyurethane foam which does not contain heavy metals, polycyclic aromatics and VOCs, has excellent dehumidifying power and humidifying power, , An antifungal property and a physical property.

It is another object of the present invention to provide a method for manufacturing an environmentally friendly artificial turf filler which is superior to conventional fillers in modulus and tensile strength.

According to an aspect of the present invention, there is provided a method for manufacturing an eco-friendly artificial turf filler material, comprising the steps of: preparing a porous spherical silica ball; 3 to 25 parts by weight of a nano-metal oxide, 25 to 30 parts by weight of an organic solvent, and 10 to 30 parts by weight of a binder; Coating the surface of the silica balls with a metal oxide by mixing and stirring 10 to 50 parts by weight of the coating composition based on 100 parts by weight of the silica balls in the step S1; 5 to 20 parts by weight of a silica ball surface-coated with a metal oxide, 3 to 8 parts by weight of polypropylene, 10 to 13 parts by weight of polyethylene, 20 to 25 parts by weight of paraffin oil, 5 to 15 parts by weight of butadiene, And 30 to 40 parts by weight of a powder; And a step S5 of forming a filling material in the form of a chip by extruding and cutting the mixed composition.

In the filler material for artificial turf grass according to the present invention and the method for manufacturing the same, at least one of NiO, FeO, Cu ₂ O, TiO ₂ and WO ₃ is selected as the nano metal oxide, and the binder is TESPT (bis- (3-triethoxysilylpropyl) tetrasulfide, the organic solvent is dichloromethane, and the step S3 is a step in which the silica balls, the nano-metal oxide, the dichloromethane, and the TESPT 3-triethoxysilpropyl) tetrasulfide) and stirring for 1 to 3 hours.

In the eco-friendly artificial turf filler according to the present invention and the method of manufacturing the same, the fill powder is composed of montmorillonite, ilite, germanium, bentonite, clay and calcium carbonate (CaCO ₃ ).

In the step S4, 5 to 20 parts by weight of the surface-coated silica balls, 3 to 8 parts by weight of polypropylene, 10 to 13 parts by weight of polyethylene, 20 to 25 parts by weight of paraffin oil and 5 to 15 parts by weight of butadiene in a reactor and stirring the mixture for 2 to 5 minutes in a primary stage; And 4 to 3 parts by weight of an antioxidant and 0.1 to 1.5 parts by weight of an antioxidant as an additive are added to the mixture of step S4-2 and step S4-3, 0.1 to 0.2 parts by weight of sulfur and 0.1 to 0.8 parts by weight of TMTD (Tetramethyl Thiuram Disulfide) are added to the mixture of step S4-3, and the mixture is stirred for 4 to 4 minutes. The temperature of the reactor is maintained at a temperature of 55 to 65 ° C.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a method for manufacturing an environmentally friendly artificial turf filling material according to the present invention, which does not contain heavy metals, polycyclic aromatics and VOCs, It has good dehumidifying power and humidifying power and less static electricity due to friction. And an antifungal property and a physical property, which are excellent in anti-fungal properties and physical properties.

In addition, the present invention is superior to conventional fillers in modulus and tensile strength.

1 is a process diagram showing each step of a method for manufacturing a filler material for artificial turfgrass according to the present invention.
2 is a view showing the structure of a conventional artificial turf.

Hereinafter, preferred embodiments of the present invention will be described in detail.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In addition, the terms described below are defined in consideration of the functions of the present invention, and these may vary depending on the intention of the user, the operator, or the precedent. Therefore, the definition should be based on the contents throughout this specification.

1 is a process diagram showing each step of a method for manufacturing a filler material for artificial turfgrass according to the present invention.

Referring to FIG. 1, the method for preparing a synthetic filler for artificial turf according to the present invention comprises the steps of: (1) providing a porous spherical silica ball; (2) 3 to 25 parts by weight of the nano metal oxide; A step S2 of preparing a coating composition comprising 10 to 30 parts by weight of a binder, and 10 to 50 parts by weight of the coating composition based on 100 parts by weight of the silica ball in the step S1, 5 to 20 parts by weight of the surface-coated silica balls, 3 to 8 parts by weight of polypropylene, 10 to 13 parts by weight of polyethylene, 20 to 25 parts by weight of paraffin oil, 5 to 15 parts by weight of butadiene, To 40 parts by weight of a mixed composition; and a step S5 of producing a filler in the form of a chip by extruding and cutting the mixed composition.

The filler prepared according to the method for manufacturing an artificial turf filler material of the present invention does not contain heavy metals, polycyclic aromatic compounds and VOCs, has excellent dehumidifying power and humidifying power, and generates less static electricity due to friction. And excellent antifungal properties and mechanical properties.

The silica balls having a solid core-mesoporous shell (SCMS) structure may be prepared by a Stober-Bohn-Fink method. The silica precursor, tetraethyl orthosilicate (TEOS) (NH 3), sodium hydroxide (NaOH) or the like is used as the catalyst, and the particle diameter is 50 nm to 10 탆 , But it is preferably 50 to 1,000 nm.

At least one of NiO, FeO, Cu ₂ O, TiO ₂ and WO ₃ may be selected as the nano metal oxide in the step S ₂ .

The binder may be TESPT (bis- (3-triethoxysilpropyl) tetrasulfide), and the organic solvent may be dichloromethane.

The coating composition of step S2 has a heat shielding function and a magnetic function, and a small amount of a dispersing agent may be added to disperse the nano-metal oxide.

In step S3, the hydroxyl group of the silica ball surface reacts with the ethoxy group of TESPT of the coating composition. More specifically, the silica balls, the nano metal oxide, the dichloromethane, and the bis (bis - (3-triethoxysilpropyl) tetrasulfide) and stirred at low speed for 1 to 3 hours to coat the surface of the silica balls.

The step S4 is a step of preparing a mixed composition by mixing the surface-coated silica balls with a polymer synthesis starting material. The polymer synthesis starting material may be a polyolefin, an oil, a butadiene, a filler powder, an additive, a sulfur or an accelerator.

Unlike conventional carbon black, the surface-coated silica balls have the advantage of improving the elastic structure and impact resistance by forming a three-dimensional chain structure together with the polymer.

Preferably, the polyolefin is a blend of polypropylene and polyethylene, wherein the polypropylene provides a hard segment and the polyethylene provides a soft segment, wherein each polypropylene comprises 3 to 8 parts by weight of polypropylene, , And 10 to 13 parts by weight of polyethylene. More preferably, the polypropylene and polyethylene are in a ratio of 1: 1.5 to 3 by weight, and when the polypropylene is more than 3 times the polyethylene, the elasticity is reduced and the risk of injury is increased due to friction when contacted with a human body. If it is less than twice, the durability becomes weak. Further, the use of a thermoplastic polyolefin has the advantage of being recyclable.

The oil serves as a softening agent and serves to prevent cracking and improve workability, and examples thereof include paraffin oil. When the amount of the oil is less than 20 parts by weight, the effect of improving the cracking and workability is not expected. When the amount of the oil is more than 25 parts by weight, it is preferable to restrict the amount of the oil to 20 to 25 parts by weight.

Examples of the additive include an ultraviolet stabilizer and an antioxidant.

The ultraviolet stabilizer is for preventing decomposition of polyolefin by ultraviolet rays, and examples thereof include benzotriazoles, benzophenone, and the like.

The antioxidant may be BHT (2.6-di-t-butyl-4-methylphenol) to prevent oxidative degradation by oxygen in the air.

The filler powder may be composed of any one of montmorillonite, ilite, germanium, bentonite, clay and calcium carbonate (CaCO ₃ ). These powders not only serve as fillers but also emit a large amount of far infrared rays upon heating.

It is preferable that the filled powder further contains a photocatalyst such as TiO ₂ and WO ₃ separately from the nano-metal oxide contained in the coating composition. In an environment such as an indoor playground, TiO ₂ and WO ₃ may act as a photocatalyst It is preferable to mix TiO ₂ and WO _{3 at a} weight ratio of 1: 0.2-0.3 so that the photocatalytic action can be performed even in visible light.

The accelerator has the function of improving the vulcanization rate and the cross-linking density, and it is preferable that the promoting material is selected from the group consisting of TMTD (Tetramethyl-Thiuram-Disulfide), MBTS (2,2-dithiobis (benzo-thiazole)), CBS (n-cyclohexyl benzothiazyl- , Etc. Among them, the use of TMTD can maximally improve the elasticity and tensile performance.

Specifically, in step S4, 5 to 20 parts by weight of the surface-coated silica balls, 3 to 8 parts by weight of polypropylene, 10 to 13 parts by weight of polyethylene, 20 to 25 parts by weight of paraffin oil, A step S4-1 of adding a part by weight of the powder to the reactor in the step S4-1 and a step S4-2 of stirring the mixture for 2 to 5 minutes, 1 to 10 parts by weight of an ultraviolet stabilizer as an additive and 0.1 to 1.5 parts by weight of an antioxidant are added to the mixture of Step 2 and Step S3-3, and 0.1 to 0.2 parts by weight of sulfur is added to the mixture of Step S4-3 And 0.1 to 0.8 parts by weight of TMTD (Tetramethyl Thiuram Disulfide), and stirring the mixture for 4 to 5 minutes.

As a result of polymeric polymerization through step S4, a three-dimensional chain structure of the SCMS-silane-polymer is formed, and the crosslinking density is increased to improve the physical properties.

In step S5, the composite is extruded and cut to produce a filler having a chip size of 1 to 5 mm in particle size.

Hereinafter, a preferred embodiment of a method of manufacturing a filler material for artificial turfgrass according to the present invention will be described in detail.

1) A silica ball having a solid core / mesoporous shell (SCMS) structure and an average particle size of 100 nm is prepared.

Specifically, the silica balls were stirred while adding 25 mole% of ethyl alcohol and 6 mole% of tetraethyl orthosilicate (TEOS) while maintaining the reaction temperature at 30 ° C., slowly dropping 65 mole% of distilled water, dropping 0.2 mole% of HCl Thereafter, the temperature was raised to 50 ° C, and the mixture was stirred for 5 hours to obtain porous spherical silica balls.

2) In a first reactor, 15 parts by weight of a nano-metal oxide consisting of TiO ₂ and WO ₃ in a weight ratio of 1: 0.2 and 25 parts by weight of dichloromethane were mixed and stirred at 70 ° C for 3 hours to prepare a gel- Oxide, 1.5 parts by weight of a dispersant and 25 parts by weight of bis- (3-triethoxysilpropyl) tetrasulfide (TESPT) were mixed and mixed at room temperature to prepare a coating composition.

3) After raising the temperature of the first reactor to 70 ° C, 100 parts by weight of silica balls are added and stirred for 2 hours to coat the surface of the silica balls.

4) While keeping the temperature in the second reactor at 60 占 폚, 15 parts by weight of the surface-coated silica balls, 5 parts by weight of polypropylene, 110 parts by weight of polyethylene, 20 parts by weight of paraffin oil and 5 parts by weight of butadiene Stir for 5 minutes.

Then, 25 parts by weight of i-lamp and 10 parts by weight of montmorillonite were added as a powder to be charged in the reactor, and the mixture was stirred for 5 minutes.

Then, 2 parts by weight of benzotriazoles and 0.5 part by weight of BHT (2.6-di-t-butyl-4-methylphenol) were added to the reactor and stirred for one minute.

0.1 part by weight of sulfur and 0.5 part by weight of TMTD (Tetramethyl Thiuram Disulfide) were added and stirred for 4 minutes to prepare a mixed composition.

5) The mixed composition is extruded and cut to prepare a filler having a particle size of 5 mm.

[Comparative Example 1]

A filler was prepared in the same manner as in Example 1 except that carbon black was used in place of the surface-coated silica in Example 1.

[Comparative Example 2]

A filler was prepared in the same manner as in Example 1, except that the silica balls not coated with the surface were used in Example 1 above.

Hereinafter, physical properties of the filler prepared in Example 1 were measured.

[Experimental Example 1]

The prepared fillers were measured for 100, 300% modulus, tensile strength and elongation using a universal testing machine (Instron 3365). The results are summarized in Table 1 below.

100% Modulus
(MPa) 300% Modulus
(MPa) Tensile strength
(MPa) Elongation
(%) Example 1 2.4 8.7 25.2 650 Comparative Example 1 1.5 5.1 17.8 650 Comparative Example 2 1.8 6.9 21.2 650

As can be seen from the above Table 1, it can be seen that the filler of Example 1 of the present invention has remarkable characteristics at the modulus and tensile strength as compared with Comparative Examples 1 and 2.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Therefore, it is to be understood that the present invention is not limited to the above-described embodiments. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims. It is also to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

Claims (5)

Providing a porous spherical silica ball;
15 parts by weight of a nano-metal oxide, 25 parts by weight of an organic solvent, and 25 parts by weight of a binder;
Coating the surface of the silica balls with a metal oxide by mixing and stirring 10 to 50 parts by weight of the coating composition based on 100 parts by weight of the silica balls in the step S1;
5 to 20 parts by weight of the surface-coated silica balls, 3 to 8 parts by weight of polypropylene, 10 to 13 parts by weight of polyethylene, 20 to 25 parts by weight of paraffin oil and 5 to 15 parts by weight of butadiene, A step S4-2 of first stirring the mixture for 5 minutes, a step S4-2 of adding the filled powder to the mixture of the step S4-1 and the second stirring for 2 to 5 minutes, 1 to 10 parts by weight of an ultraviolet stabilizer and 0.1 to 1.5 parts by weight of an antioxidant are added to the mixture of step S4-3 and step S3-3, and 0.1 to 0.2 parts by weight of sulfur are mixed with tetramethylthiuram disulfide The temperature of the reactor in steps S4-1 to S4-4 is in the range of 55 to 100 ° C., Maintaining the temperature at 65 [deg.] C; And
And a step S5 of forming a filling material in the form of a chip by extruding and cutting the mixed composition.
The method according to claim 1,
Wherein the filling powder is composed of any one of montmorillonite, ilite, germanium, bentonite, clay and calcium carbonate (CaCO ₃ ).
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