CN110228120B

CN110228120B - Preparation method of artificial turf filling material and artificial turf filling material

Info

Publication number: CN110228120B
Application number: CN201810473247.3A
Authority: CN
Inventors: 朴普正; 朴慧珠; 桂烔完; 韩峻熙
Original assignee: Co Gsk
Current assignee: Co Gsk
Priority date: 2018-03-06
Filing date: 2018-05-17
Publication date: 2021-03-23
Anticipated expiration: 2038-05-17
Also published as: KR101841220B1; CN110228120A

Abstract

A preparation method of an artificial turf filling material and the artificial turf filling material. The method comprises the following steps: a material preparation step of preparing a plant material and an inorganic substance; a vegetable material pulverization step of pulverizing the prepared vegetable material; a plant material drying step of drying the pulverized plant material to remove moisture; a mixing and molding step of mixing and drying the dried plant material and inorganic substance and then molding to prepare a molded body; a firing step of heating the molded article to fire the molded article; and a cooling step of cooling the fired molded article to form a fired pellet. According to the present invention, a filling material in a form of a burned ball is prepared by mixing a plurality of plant materials and inorganic materials and burning the mixture, thereby facilitating drainage of the artificial turf, forming an air layer between the artificial turf, improving maintainability, moisture retention and punching properties, preventing burning of a user due to heating in summer, facilitating growth of natural turf seeds in a space between the artificial turf, and ensuring environmental stability such as deodorizing properties by using a natural material.

Description

Preparation method of artificial turf filling material and artificial turf filling material

Technical Field

The present invention relates to a method for preparing an artificial turf infill material and an artificial turf infill material prepared thereby, and more particularly, to a method for preparing an artificial turf infill material and an artificial turf infill material prepared thereby, in which a plurality of plant materials and inorganic materials are mixed and fired to prepare an infill material in a form of a burned ball, thereby facilitating drainage of artificial turf, forming an air layer between artificial turf, improving maintainability, moisture retention and punching properties, preventing burning of a user due to thermalization of the artificial turf in summer, allowing seeds of natural turf to easily grow in a space between the artificial turf, and ensuring environmental stability such as deodorization characteristics by using a natural material.

Background

In general, artificial turf is often constructed in places where there is no natural lighting, places where treads are concentrated, places where natural turf is difficult to grow due to weather, and places where it is difficult to manage turf.

Although such artificial turf is more expensive to construct in an initial stage than natural turf, it can be used semipermanently, is easy to maintain and manage, has a surface flatness suitable for sports, and thus has an increased preference for artificial turf.

In general, artificial turf is laid by placing artificial turf on an upper portion of a ground surface such as concrete or a gravel surface, pouring silica sand between the artificial turf to fix the artificial turf, and laying a rubber core filler on the silica sand to provide a predetermined elasticity to the artificial turf, thereby embedding the artificial turf in the filler.

However, the rubber core used as the filler is exposed to ultraviolet rays, so that the surface thereof is corroded by light, and the powder is scattered and drifted around, and if the powder is inhaled by infants or children, the health of the infants or children can be damaged.

On the other hand, if the filler obtained by firing natural minerals lacks strength, the life of the filler is reduced by stepping on the filler, and scattered dust is generated, thereby reducing water drainage.

Further, when the user slips the artificial turf, the artificial turf is burned due to friction between the skin and the rubber as the filler, and the surface temperature of the artificial turf rapidly rises in hot summer, and in a dry state, the artificial turf is inconveniently charged due to static electricity, and not only does this increase the risk of fire and the like.

Documents of the prior art

Patent document

Patent document 0001: korean granted patent No. 10-1773146 No. 2017, 08, month 24, granted

Patent document 0002: korean granted patent No. 10-0799262, 2008, 01, 23

Patent document 0003: korean granted patent No. 10-1295279 No. 2013, 08 Yue 05

Disclosure of Invention

The present invention provides a method for preparing an artificial turf infill material, which can facilitate drainage of artificial turf, form an air layer between artificial turf, improve maintainability, moisture retention and punching properties, prevent burning of a user due to heating of the artificial turf in summer, facilitate the growth of seeds of the natural turf in a space between the artificial turf, and ensure environmental stability such as deodorization characteristics by using a natural material, and an artificial turf infill material prepared thereby.

Further, an object of the present invention is to provide a method for manufacturing an artificial turf infill material, which is environmentally friendly and harmless to the human body by using various plant materials and inorganic materials, has an excellent moisture content by forming pores between the infill materials, and can reduce the risk of burning even if a person slips on the infill material, and an artificial turf infill material manufactured thereby.

Another object of the present invention is to provide a method for manufacturing an artificial turf infill material, which maintains moisture between pores of the infill material to suppress generation of static electricity in the artificial turf, prevents an increase in the surface temperature of the artificial turf, absorbs the moisture in rainy weather to lock the water, and discharges the water locked by the infill material little by little to maintain the moisture in the artificial turf infill material in dry or hot weather, and an artificial turf infill material manufactured thereby.

Further, an object of the present invention is to provide a method for manufacturing an artificial turf filler which can improve the properties of the filler obtained by firing natural minerals, such as breakage due to insufficient strength, generation of scattered dust, and durability due to treading, and an artificial turf filler manufactured thereby.

It is another object of the present invention to provide a method for manufacturing an artificial turf infill material, which can remove the smell of turf, improve antibacterial properties against excreta of animals and the like and moisture retention of the infill material, purify air from fine dust in the air, maintain a comfortable environment, and ensure environmental stability, by manufacturing the infill material using various plant materials and inorganic materials.

The various objects to be achieved by the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

The preparation method of the artificial turf infill material of the present invention may comprise: a material preparation step S100 of preparing a plant material and an inorganic substance; a plant material pulverization step S200 of pulverizing the prepared plant material; a plant material drying step S300 of drying the pulverized plant material to remove moisture; a mixing and molding step S400 of preparing a molded body by molding after mixing and drying the dried plant material and inorganic substance, the molded body being capable of removing a taste of the turf, purifying air from fine dusts in the air by improving antibacterial property to animal excreta and moisture retention to a filler material, and maintaining a comfortable environment; a firing step S500 of heating the molded article to be molded to thereby fire the molded article; and a cooling step S600 of forming a sintered pellet by cooling the sintered compact.

In the material preparation step S100, the plant material may be one or more selected from the group consisting of chaff, kudzu, hemp, cork, sawdust, straw, sugar cane, pine needle, and waste wood powder, and the inorganic material may be one or more selected from the group consisting of bentonite, loess, talc, diatomaceous earth, vermiculite, perlite, montmorillonite, sericite, dolomite, and zeolite.

In the plant material pulverizing step S200, the plant material is pulverized so as to have a particle diameter of 10 to 2000 μm, and in the plant material drying step S300, the pulverized plant material is dried at a temperature of 70 to 150 ℃ for 1 to 5 hours so that the water content of the pulverized plant material reaches 5 to 10 wt%.

In the mixing and molding step S400, the dried plant material and the inorganic substance are mixed in a weight ratio of 0.1 to 30 parts by weight of the dried plant material and 70 to 99.9 parts by weight of the inorganic substance, respectively, and dried at a temperature of 50 to 70 ℃ for 1 to 10 hours, and then pelletized or applied with 50kgf/cm by an extrusion molding machine²To 250kgf/cm²The pressure of (3) is so that the particle diameter of the molded article can be 1mm to 5 mm.

In the firing step S500, the internal temperature of the furnace is maintained at 300 to 550 ℃, the molded article is fired for 1 to 10 hours by raising the temperature to 700 to 1300 ℃ after being charged into the furnace, and in the cooling step S600, the molded article is cooled by leaving the molded article at 250 to 300 ℃ for 1 to 3 hours, and then left at 55 to 65 ℃ for 5 to 15 hours after being taken out of the furnace.

The sintered pellets prepared in the cooling step S600 were used by mixing 1 to 60 parts by weight of an elastic sheet with 100 parts by weight of the sintered pellets, and the elastic sheet had a length, width and height of 1 to 5mm and a specific surface area of 0.0008m without applying an external force²G to 0.1m²(ii) a range of/g.

The above-mentioned burnt-on balls or burnt-on balls used in combination with the elastic sheet are laid by mixing natural turf seeds.

Also, the present invention includes an artificial turf infill material prepared by the above method of preparing an artificial turf infill material.

Other specific matters of the embodiments are described in the detailed description of the invention.

The method for preparing the artificial turf filling material of the present invention prepares the filling material in a burned ball form by mixing a plurality of plant materials and inorganic materials and burning the mixture, thereby facilitating the drainage of the artificial turf, forming an air layer between the artificial turf, improving the maintainability, the moisture retention and the punching property, preventing the burning of a user due to the heating of the artificial turf in summer, allowing the seeds of the natural turf to grow in the space between the artificial turf easily, and ensuring the environmental stability such as the deodorization characteristic by using the natural material.

In addition, the artificial turf filling material of the present invention uses various plant materials and inorganic substances to achieve environmental protection and no harm to human bodies, and has excellent moisture content by forming pores between the filling materials, thereby reducing the risk of burning even if a person slips on the filling material.

In addition, the artificial turf filling material according to the present invention maintains moisture between pores of the filling material to suppress generation of static electricity in the artificial turf, and prevents a temperature rise in the surface of the artificial turf, and the filling material absorbs moisture and locks water in rainy days, and in dry or hot weather, the moisture locked by the filling material is discharged little by little to maintain the moisture in the artificial turf filling material, thereby maintaining the temperature.

Also, the artificial turf infill according to the present invention is prepared using various plant materials and inorganic substances, so that the taste of the turf can be removed and fine dusts in the air can be purified and a comfortable environment can be maintained by improving an antibacterial effect against animal excreta and moisture retention of the infill, thereby ensuring environmental stability.

The embodiments of the technical idea of the present invention can provide various effects not specifically mentioned, which can be fully understood.

Drawings

Fig. 1 is a flow chart for explaining a method of preparing the artificial turf infill material of the present invention.

Fig. 2 is a sectional view schematically showing a state where the artificial turf infill material of the present invention is provided.

Wherein, 100: artificial turf filler material 110: artificial turf

120: the ground 130: silica sand

Detailed Description

The advantages, features and methods of accomplishing the same will become more apparent with reference to the following examples. However, the present invention is not limited to the embodiments described herein, and can be embodied in other embodiments. The following examples are provided only to enable those skilled in the art to fully understand the concept of the present invention.

The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Unless otherwise defined, all terms used in the present specification including technical terms or scientific terms have meanings commonly understood by those of ordinary skill in the art. Terms defined in commonly used dictionaries should be interpreted as having the same meaning as a context of the related art and should not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Hereinafter, preferred embodiments of the method for manufacturing the artificial turf infill according to the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a flow chart for explaining a method of preparing the artificial turf infill material of the present invention, and fig. 2 is a sectional view schematically showing a state in which the artificial turf infill material of the present invention is provided.

Referring to fig. 1 and 2, the method for preparing the artificial turf filler according to the present invention includes a material preparation step S100, a vegetable material pulverization step S200, a vegetable material drying step S300, a mixing and molding step S400, a firing step S500, and a cooling step S600.

1. Material preparation step S100

The material preparation step S100 is a step of preparing a plant material and an inorganic material as a filler for filling the artificial turf.

In the material preparation step S100, a plurality of plant materials and inorganic substances may be prepared, and for example, one or more selected from the group consisting of chaff, kudzu, hemp, cork, sawdust, straw, sugar cane straw, pine needle, and waste wood powder may be used as the plant material, or a plurality of known plant materials other than the above-mentioned materials may be included.

In the material preparation step S100, the inorganic material may include one or more selected from the group consisting of bentonite, loess, talc, diatomaceous earth, vermiculite, perlite, montmorillonite, sericite, dolomite, and zeolite, and may include various known inorganic materials used for preparing an artificial turf filler in addition to the above materials.

More specifically, as the inorganic substance, one or more inorganic substances selected from the group consisting of calcium carbonate, silica, titanium dioxide, kaolin and mica may be added in addition to the above inorganic substance in order to adjust the strength, specific gravity and the like of the resulting fired pellet without interfering with the technical idea of the present invention.

For example, the chaff does not generate a second industrial waste, does not generate a public hazard during processing, does not generate carbon, does not have an environmental burden cost at all, and has a high water content and excellent heat insulation performance, and the temperature of the artificial turf can be maintained at a low level, thereby greatly reducing the possibility of burning even if a user slips.

The loess contains a large amount of microorganisms beneficial to human body and environment, and can inhibit growth of mold, so as to maintain the filling material for ground in a comfortable state. And, the loess prevents infection of various germs in the prepared artificial turf filling material, and releases a large amount of far infrared rays at a temperature of 40-50 ℃. In particular, since the loess prevents allergy, the risk of allergy occurrence can be greatly reduced even when children or children play on the artificial turf. Further, since the loess is incombustible, the problem of burning of the filler can be greatly reduced.

The Zeolite is a silicate mineral, and has a crystal structure in which the atoms are loosely bonded to each other, so that even if water filled between the atoms is released at a high temperature, the original framework can be maintained, and other particulate matter can be adsorbed in the internal space. In particular, the above zeolite is excellent in deodorizing effect and adsorption effect, and thus can adsorb and remove harmful components.

For example, the zeolite has a specific surface area of 500m²G to 1000m²(ii)/g, the zeolite particles have a particle diameter of 100nm to 300nm, and the zeolite is prepared in a powder form by first mixing Sodium hydroxide with pure water and dissolving the mixture, adding Sodium Aluminate and stirring the mixture for 1 to 3 hours to prepare a mixed solution, and mixing 1M Al with the mixed solution₂O₃4M Na₂O, 10M SiO₂And 125M of H₂And O, stirring at a temperature of 35 to 40 ℃ at a rotation speed of 300 to 350RPM for 3 to 5 hours, heating and stirring the stirred mixture at a temperature of 85 to 100 ℃ at a rotation speed of 200 to 250RPM for 3 to 6 hours, and crystallizing the heated and stirred mixture at a temperature of 80 to 95 ℃ at a rotation speed of 100 to 150RPM using a microwave heat source for 1 to 3 hours, thereby synthesizing zeolite crystals. After the unreacted material of the above zeolite crystal is washed with pure water, heating and stirring are carried out in a drier at a temperature of 70 ℃ to 80 ℃ for 3 hours to 5 hours, then the pH is adjusted to 6.0 to 7.0 with 3% nitric acid, and then ammonium chloride NH is added₄Preparing a zeolite crystallization solution by stirring a Cl solution at a temperature of 30 to 40 ℃ for 15 to 20 hours at a rotation speed of 100 to 150RPM, adding 1000 to 1500 parts by weight of pure water to 100 parts by weight of the zeolite crystallization solution, and stirring, and adding 10 to 15 parts by weight of 12% silver nitrate AgNO₃The solution is washed by a reaction at a temperature of 35 to 45 ℃ for 5 to 10 hours, and after the washing, the powder-type zeolite is calcined in a drier at a temperature of 550 to 600 ℃ for 10 to 12 hours.

2. Vegetable Material pulverizing step S200

The plant material pulverizing step S200 is a step of pulverizing the prepared plant material.

In the vegetable material pulverizing step S200, the vegetable material and the inorganic substance may be uniformly mixed by pulverizing the vegetable material in a powder form, and the vegetable material may be pulverized to have a particle size of 10 to 2000 μm to prepare a filler having a suitable strength.

3. Vegetable Material drying step S300

The plant material drying step S300 is a step of drying the pulverized plant material to remove water.

In the plant material drying step S300, the pulverized plant material may be dried at a temperature of 70 to 150 ℃ for 1 to 5 hours so that the water content of the pulverized plant material reaches 5 to 10 wt%.

In the plant material drying step S300, when the crushed plant material is dried to less than the lower limit of the above range, moisture contained in the plant material cannot be sufficiently discharged, and there is a possibility that pores of the prepared filler material become excessively large, which may cause a decrease in strength, and when the crushed plant material is dried to more than the upper limit of the above range, there is a possibility that the water absorption and maintainability of the prepared filler material may decrease.

4. Mixing and Forming step S400

The mixing and molding step S400 is to prepare a molded body by molding after mixing and drying the dried plant material and inorganic substance.

In the mixing and molding step S400, the dried plant material and inorganic matter are mixed and dried with water, and then molded to prepare a molded body, the dried plant material and inorganic matter are mixed in a weight ratio of 0.1 to 30 parts by weight of the dried plant material and 70 to 99.9 parts by weight of the inorganic matter, respectively, and then dried at a temperature of 50 to 70 ℃ for 1 to 10 hours, and then pelletized or extruded to prepare a pelletA molding machine for applying 50kgf/cm²To 250kgf/cm²So that the particle diameter of the molded article is 1mm to 5 mm.

In the mixing and molding step S400, after the dried plant material and inorganic substance are mixed and dried, the molded body is prepared by molding, so that the taste of the turf can be removed, and fine dust in the air can be purified and a comfortable environment can be maintained by improving antibacterial properties against animal excreta and moisture retention against the filler.

In the mixing and molding step S400, when the content ratio of the dried plant material and inorganic material is out of the above range, the internal pores of the prepared filler may be insufficient, the strength of the filler may be reduced, and fine powder may be generated during use.

In the mixing and molding step S400, the dried plant material and inorganic material may be mixed in a weight ratio of 0.1 to 30 parts by weight of the dried plant material and 70 to 99.9 parts by weight of the inorganic material, respectively, but in the case of using an inorganic material having a large amount of pores such as diatomaceous earth, the amount of the plant material may be reduced, but in the case of using a plant material having a large amount of pores greater than 30 parts by weight, the pores of the prepared fired pellets are so large that the strength of the fired pellets is not easily maintained and the fired pellets are easily broken, and therefore, it is preferable that the dried plant material and inorganic material are mixed in a weight ratio of 0.1 to 30 parts by weight of the plant material and 70 to 99.9 parts by weight of the inorganic material, respectively.

The pressure of the extrusion molding machine is set according to the mixing ratio of the plant material to be dried and the density of the mineral, and is usually less than 50kgf/cm²When the density of the molded article is lowered, it is difficult to maintain sufficient strength after firing, and when the density is more than 250kgf/cm²However, this is not preferable because it is not only limited to improvement of the density, but also increases the production cost of the equipment and increases energy consumption.

5. Firing step S500

The firing step S500 is a step of firing the molded article by heating it.

In the above-mentioned firing step S500, the molded article prepared in the form of a sphere may be fired by heating the molded article in a furnace, for example, a tunnel kiln (tunnel kiln) or a discontinuous furnace, the furnace may maintain the internal temperature at 300 to 550 ℃, and after the molded article is charged into the furnace, the firing may be performed in an oxidizing or reducing (neutral) atmosphere for 1 to 10 hours while gradually raising the temperature to 700 to 1300 ℃.

In the firing step S500, the molded article may be put into the furnace after the internal temperature of the furnace is maintained at 300 to 550 ℃, and the molded article may be prevented from being cracked or damaged by initial heat supply by maintaining the internal temperature of the furnace at the temperature condition described above.

In the firing step S500, after the molded article is charged, the temperature is slowly raised to 700 to 1300 ℃ to fire the molded article in an oxidizing or reducing neutral atmosphere for 1 to 10 hours, and if the firing is performed under the temperature and time conditions described above, there is a possibility that the absorption rate is lowered and it is difficult to prepare a filler having a desired extrusion strength, and if the firing is performed under the temperature and time conditions described above, the effect of improving the physical properties of the filler is small, and on the contrary, the cost required for high-temperature treatment is increased, thereby increasing the production cost.

According to the present invention, in the firing step S500, the plant material is carbonized in the molded body, the carbonized portion of the plant material is reduced in volume to form pores, the carbonized plant material contains various mineral components in addition to the carbon component, and thus an optimal place for growing natural turf, various plants, and microorganisms can be provided at a place where artificial turf is formed, and the pores slowly discharge the absorbed moisture after absorbing moisture, so that a rapid temperature rise of artificial turf is suppressed in summer, and skin burn due to friction of a user is prevented.

6. Cooling step S600

The cooling step S600 is a step of cooling the fired compact to form a fired pellet.

In the cooling step S600, the fired molded article is cooled by leaving the molded article in a furnace at a temperature of 250 to 300 ℃ for 1 to 3 hours, then leaving the molded article at a temperature of 55 to 65 ℃ for 5 to 15 hours, and the fired molded article is cooled by the two-step cooling process, thereby preventing surface cracking and a decrease in compressive strength of the fired molded article due to rapid cooling and preventing shrinkage of pores formed on the surface of the fired molded article.

On the other hand, according to the present invention, in the case where the above-mentioned baked ball is used as a filling material for artificial turf, it is possible to have a moisture absorbing and discharging function and to contribute to the growth of natural turf by supplying minerals or the like, but since the artificial turf playing field may be deteriorated in impact absorbing performance when it is compacted by stepping on by a user, it is necessary to appropriately perform aeration Airation in order to maintain the impact absorbing performance of artificial turf.

The present invention has been made to solve the above-mentioned problems and to improve the effects of the present invention, it is preferable to use an elastic sheet deformable by pressing together with the fired ball prepared according to the present invention, in a mixed manner to maintain the impact absorption performance and to supply oxygen necessary for smooth growth of the natural turf to the roots of the plants.

In the case where the fired pellets prepared in the present invention or the fired pellets mixed with the elastic sheet are laid on a sports field or the like, natural turf seeds can be mixed for laying, and the natural turf seeds can germinate and grow in the pores (or spaces) between the fired pellets or the fired pellets mixed with the elastic sheet, so that an environment-friendly artificial turf can be embodied.

Preferably, the elastic sheet used in the present invention has a length, width and height of 1mm to 5mm, respectively, and a specific surface area of 0.0008m in a state of not receiving an external force²G to 0.1m²Voids of the order of/g.

In the present invention, when the specific surface area of the elastic sheet is less than 0.0008m²In terms of a specific surface area of more than 0.1m, pores are reduced to cause insufficient ventilation²In the case of the specific gravity of the air-permeable membrane,/g, the specific gravity may be decreased to be washed away by rainwater in rainy weather, or the pore size may be decreased to half.

That is, the artificial turf infill material can be constituted by mixing 1 to 60 parts by weight, more preferably 30 to 60 parts by weight, of the elastic sheet (rubber sheet) with respect to 100 parts by weight of the fired ball prepared through the above cooling step S600. In the present invention, when the fired balls and the elastic sheet prepared as described above are laid on a sports field or the like, they can be laid in a state in which they are mixed or stacked in order, and can be used in a mixed manner.

When the elastic sheet is included so as to be less than the lower limit of the above range, there is a possibility that the rebound force of the elastic sheet is reduced to increase the fatigue of the user, and the contact between the burned balls may cause severe wear during use, thereby shortening the life of the filler.

When the elastic sheet is included so as to be larger than the upper limit of the above range, the repulsive force may exceed a reference value, and thus there may be a problem that the horizontality of the prepared filling material is deteriorated due to the cohesion phenomenon of the elastic sheet.

Also, in the present invention, the elastic sheet may change the mixing ratio in the above range on the spot according to whether the lower mat is used or not or the elastic absorbing force of the mat when the artificial turf is set.

As the elastic sheet (rubber sheet), various known ones having elasticity such as an EPDM elastic sheet (rubber sheet), a urethane elastic sheet (rubber sheet), a recycled elastic sheet (rubber sheet), a styrene elastomer SEBS, and a polyvinyl butyral PVB can be used.

For example, the Ethylene-Propylene-Diene monomer (epdm) elastomer sheet means a synthetic rubber made of Ethylene (Ethylene), Propylene (Propylene) and a Non-conjugated Diene, and has excellent ozone resistance, cold resistance, heat resistance and solvent resistance and good safety, and thus can be formed in various colors and patterns.

Further, the polyurethane used for preparing the polyurethane elastic sheet may be prepared by molecularly bonding alcohol and Isocyanate (Isocyanate) through a polymerization reaction under the generation of reaction heat, and is excellent in abrasion resistance in terms of adhesive strength and material characteristics, particularly in weather resistance and chemical resistance, and thus hardly undergoes color change and physical property change even when exposed to ultraviolet light or acid rain.

Further, since the regenerated elastic sheet is produced from waste resources recovered from waste tires or the like and is substantially black, it can be used for various surfaces to be constructed by using a urethane resin, a coating agent, or the like after the rubber powder is prepared, and can also be used in various facilities such as amusement parks, walking roads, and the like.

Also, according to the present invention, the filling material for artificial turf may be prepared using the fired pellets prepared through the cooling step S600, and a coating layer may be further formed on the surface of the prepared fired pellets in order to increase the surface micro-porosity of the prepared filling material.

For example, first, a polymer solution is prepared by mixing 35 to 55 parts by weight of a polyvinylidene fluoride-based resin, 40 to 60 parts by weight of a good-solvent (good-solvent), 5 to 10 parts by weight of a poor-solvent (pore-solvent), and 3 to 7 parts by weight of a pore-forming promoter.

In this case, as the Polyvinylidene Fluoride resin, a known Polyvinylidene Fluoride resin having a molecular weight of 500000g/mol to 550000g/mol can be used.

The good solvent (good solvent) is used to dissolve the polyvinylidene fluoride resin, and in the present invention, dimethylacetamide (dimethyl acetamide) is used as the good solvent.

The poor solvent is used to adjust the pore size and porosity of the surface of the coating layer formed on the surface of the microorganism carrier, and may be used by mixing dimethyl phthalate (dimethyl phthalate) and diethyl phthalate (diethyl phthalate) in a weight ratio of 1: 1 to 1: 1.3.

The pore formation promoter is used to promote pore formation on the surface of the coating layer formed on the surface of the artificial turf infill material, and the pore formation catalyst may be used by mixing polyvinylpyrrolidone (polyvinylpyrrolidone) and benzoic acid (benzoic acid) in a weight ratio of 1: 1 to 1: 1.3.

Then, the polymer solution is heated at a temperature of 160 to 170 ℃ for 30 to 100 minutes, and thereafter, the heated polymer solution may be cooled.

Next, after mixing the cooled polymer solution and the sintered spheres, a coating layer prepared in the form of a porous film is prepared by performing a phase transfer step in which a homogeneous single-phase melt is prepared by melt blending (dilution) with a diluent (diluent) capable of finely dispersing the polymer at a temperature not lower than the melting point of the polymer, and the melt is formed into a flat plate or a hollow fiber film, followed by cooling to induce phase separation, and then extracting with the diluent to prepare a porous film having pores formed therein.

In this case, gamma-butyrolactone (gamma-butyrolactone) is used as the poor solvent for the diluent, ethylene glycol (ethylene glycol) is used as the internal coagulation liquid (bore fluid) for forming the hollow in the preparation of the porous membrane, and distilled water is used as the non-solvent for phase transfer in the coagulation bath (coagulation bath), so that the internal coagulation liquid can maintain a temperature range of 30 ℃ to 60 ℃ and the phase transfer bath can maintain a temperature range of 50 ℃ to 70 ℃.

The present invention can use the infill prepared as described above as an infill for artificial turf, and as shown in fig. 2, the artificial turf 110 is layered on the ground 120, and silica sand 130 is scattered between the artificial turf 110, so that the artificial turf 110 is stably fixed to the ground 120, and functions to raise the grass of the artificial turf. The filling material 100 is scattered on the silica sand 130 to be scattered between the artificial turf 110. As such, the artificial turf 110 is covered with the infill material 100 except for a portion thereof.

While the preferred embodiments of the present invention have been described with reference to the accompanying drawings, it is to be understood that those skilled in the art can embody the present invention in other specific embodiments without changing the technical idea or essential features of the present invention. The above-described exemplary embodiment is therefore to be considered in all respects as illustrative and not restrictive.

Claims

1. A method of preparing an artificial turf infill material, comprising:

a material preparation step S100 of preparing a plant material and an inorganic substance;

a plant material pulverization step S200 of pulverizing the prepared plant material;

a plant material drying step S300 of drying the pulverized plant material to remove moisture;

a mixing and molding step S400 of preparing a molded body capable of removing the taste of the turf and improving the antibacterial property against animal excreta and moisture retention of the filling material by molding after mixing and drying the dried plant material and inorganic substance, thereby purifying air from fine dusts in the air and maintaining a comfortable environment;

a firing step S500 of heating and firing the molded article; and

a cooling step S600 of forming a sintered pellet by cooling the sintered compact,

wherein in the material preparation step S100, the plant material is at least one selected from the group consisting of chaff, kudzu, hemp, cork, sawdust, straw, sugar cane, pine needle and waste wood powder, the inorganic material is at least one selected from the group consisting of bentonite, loess, talc, diatomaceous earth, vermiculite, perlite, montmorillonite, sericite, dolomite and zeolite,

in the vegetable material pulverizing step S200, the vegetable material is pulverized to a particle size of 10 to 2000 μm,

in the plant material drying step S300, the pulverized plant material is dried at a temperature of 70 to 150 ℃ for 1 to 5 hours so that the water content of the pulverized plant material reaches 5 to 10 wt%.

2. The method for preparing artificial turf infill material of claim 1,

in the mixing and molding step S400, the dried plant material and the inorganic substance are mixed in a weight ratio of 0.1 to 30 parts by weight of the dried plant material and 70 to 99.9 parts by weight of the inorganic substance, respectively, dried at a temperature of 50 to 70 ℃ for 1 to 10 hours, and then pelletized or applied with 50kgf/cm using an extrusion molding machine²To 250kgf/cm²Thereby forming a molded article having a particle diameter of 1mm to 5 mm.

3. Method for the production of an artificial turf infill material according to claim 2,

in the firing step S500, the internal temperature of the furnace is maintained at 300 to 550 ℃, the molded article is charged into the furnace, and then the temperature is raised to 700 to 1300 ℃ and firing is performed for 1 to 10 hours,

in the above cooling step S600, after the above molded body is taken out from the furnace, it is left to stand at a temperature of 250 to 300 ℃ for 1 to 3 hours for cooling, and then it is left to stand at a temperature of 55 to 65 ℃ for 5 to 15 hours for cooling.

4. Method for producing an artificial turf infill material according to claim 3,

1 to 60 parts by weight of an elastic sheet is further mixed with 100 parts by weight of the fired pellets prepared by the above cooling step S600,

the length, width and height of the elastic sheet are 1mm to 5mm respectively under the state of no external force, and the specific surface area is 0.0008m²G to 0.1m²(ii) a range of/g.

5. Method for preparing an artificial turf infill material according to claim 4,

the burnt ball or the burnt ball mixed with the elastic sheet is laid after being mixed with the natural turf seeds.

6. An artificial turf infill material, characterized in that,

which is prepared by the method for preparing an artificial turf infill material according to any one of claims 1 to 5.