KR101674905B1 - Thermal barrier, antistatic, and self-healing artifical lawn filling chips and manufacturing mehtod thereof - Google Patents

Abstract

The present invention relates to an artificial turf filling material and a manufacturing method thereof and, more specifically, to a self-healing type artificial turf filling material with heat blocking properties and antistatic properties and a manufacturing method thereof. An artificial turf filling coating chip according to the present invention is the self-healing type artificial turf filling material for heat blocking and preventing electrification characterized by a fact that a binder coating layer containing 0.1-10 wt% of a thermal barrier, 0.1-10 wt% of an antistatic agent, and 0.1-10 wt% of self-healing capsules is formed on a surface of a regenerated or a new rubber chip. The artificial turf filling material according to the present invention is formed into a chip form including the capsules receiving self-heating substances therein on the surface coating layer, thereby preventing an exposure of internal rubber materials due to damage to the coating layer or the separation of the coating layer caused by a mixture of the thermal barrier and the antistatic agent. In addition, the artificial turf filling material is able to improve the durability of the coating chips by a recovery through surface healing.

Description

TECHNICAL FIELD [0001] The present invention relates to an artificial turf filler and a method for manufacturing the same,

TECHNICAL FIELD The present invention relates to a synthetic turf filler and a method of manufacturing the same, and more particularly, to a self-healing artificial turf filler having a heat shielding and antistatic property and a method for manufacturing the same.

Recently, in order to prevent safety accidents during use and to obtain landscaping effects, artificial turf fields are being constructed at elementary schools, junior high schools, and high schools and local governments. Artificial turf is composed of grass grass with the shape of grass and filling material to provide elasticity, and various elastic chips are used as the filling material. Initially, waste materials such as waste tires and industrial waste rubber were used. However, waste materials contained in the waste materials are being developed with the use of new rubber chips due to concerns about health or environmental problems.

There is a continuing demand for antistatic properties and heat resistance of such artificial turf fillers. The antistatic property is intended to solve the problem that artificial turf fillers mainly composed of rubber are stuck to the body due to static electricity when the artificial turf falls from the artificial turf and the artificial turf is heated in the sun, This is to reduce the risk of this.

In order to impart antistatic properties, it is possible to prepare chips by mixing known antistatic agents, but there is a problem of cost increase due to the use of expensive antistatic agents. In addition, when used over a long period of time in a playground, the antistatic agent that has flowed to the surface is lost and the antistatic property is lowered. In order to solve this problem, the present inventors have proposed a rubber composition comprising 0.01 to 0.1 parts by weight of conductive metal particles per 100 parts by weight of a rubber chip, 0.5-1 parts by weight of fibers, 0.5-1 parts by weight of biodegradable fibers and 15-30 parts by weight of a binder mixture.

Korean Patent No. 1015392 issued to Samhwa Paint Co., Ltd. has proposed a method of mixing a special lacquer material with a filler rubber filled between lawns so that artificial lawns have heat resistance , And Korean Patent Application No. 10-2015-0041311 filed by the present inventor, discloses a method for introducing heat resistance, which comprises introducing a regenerated or new rubber chip and expandable graphite 1 to 10 Discloses an artificial turf filler in which an infrared heat shielding coating layer is formed which comprises 0.5 to 1 part by weight of a hydrophilic fiber, 0.5 to 1 part by weight of a hydrophilic fiber, 0.5 to 1 part by weight of a biodegradable fiber and 10 to 20 parts by weight of a polyurethane binder mixture.

However, the multifunctional filler for artificial grass having such antistatic property and heat resistance has a high possibility of breakage due to introduction of functional particles.

A problem to be solved by the present invention is to provide a novel artificial turf filler having heat resistance and antistatic properties.

Another problem to be solved by the present invention is to provide a method for producing a filler for artificial turf having heat resistance and antistatic property.

Another object of the present invention is to provide a novel artificial turf filler capable of solving the problem caused by introduction of functional particles while having heat resistance and antistatic property and a method for producing the same.

In order to solve the above problems,

Characterized in that a binder coating layer is formed on the surface of the reclaimed or novel rubber chip, comprising 0.1 to 10 parts by weight of a heat-sensitive adhesive, 0.1 to 10 parts by weight of an antistatic agent, and 0.1 to 10 parts by weight of a self-healing capsule, based on 100 parts by weight of the binder Thereby providing a self-elevating oil-based synthetic turf filler for preventing heat and electrification.

Although not theoretically limited, fine cracks are generated before and after the particle-shaped antistatic agent or the heat shielding agent contained in the coating layer coated on the surface of the rubber chip is detached from the coating layer due to prolonged use. The self-healing material flows out and the cracks are restored, thereby preventing the release of the functional material, and even if the capsule is dislodged, cracks are enlarged and the rubber chip is prevented from being broken do.

In the present invention, the heat shielding material may be a conventional heat shielding material, and various heat shielding materials disclosed in Korean Patent No. 1015392, which is incorporated herein by reference in its entirety, may be used. In the practice of the present invention, the heat shielding material may be a heat shielding material such as TiO2 or an iron chromium composite oxide, and it is preferable to use a thin film heat shielding material such as peeled mica so as to be aligned on the surface of the good.

In a preferred embodiment of the present invention, a small amount of a compatibilizing agent may be used for the coating liquid so that the inorganic heat shielding material may improve the compatibility with the binder, and preferably includes a silane compound. As the silane compound, compounds such as vinyl silane and mercaptosilane may be used, and they may be commercially purchased and used. For example, the silane compound may be selected from the group consisting of methyltrimethoxysilane (MTMS), 3-glycidoxypropyltrimethoxysilane (GPTMS), 3-methacryloxypropyltrimethoxysilane (3- methacryloxypropyltrimethoxysilane (MPTMS), and aminopropyl triethoxysilane. The silane compound may be used in an amount of 0.1-0.2 parts by weight based on 100 parts by weight of the coating liquid.

In the present invention, the antistatic agent may be nanoparticles or microparticles having conductivity, for example, conductive carbon black, carbon fiber, or the like, or a conductive polymer may be used. The conductive polymer may be one selected from the group consisting of polyaniline, polythiophene and polypyrrole, or a modified conductive polymer modified therefrom. Examples of the conductive polymer include polyaniline substituted with a sulfonyl group, poly Thiophene, polythiophene substituted with ethylene dioxy group, octadecyl, biphenyl-substituted polypyrrole, and the like can be used. Preferably, expanded graphite can be used so as to have elasticity similarly to a rubber chip, and surface-modified expanded graphite can be preferably used so as to have high conductivity. In the present invention, the expanded graphite can be modified to have high conductivity by the method disclosed in Korean Patent Laid-Open No. 10-2012-0055010.

In the present invention, the self-healing capsules means a material capable of restoring the physical properties of the composite by transforming the polymer into a polymer upon breakage of the capsule by stress or light irradiation applied to the elastic chip.

In the practice of the present invention, the self-healing material may be a material capable of being polymerized by cracking of the matrix, for example a monomer, a prepolymer, or a functional polymer comprising two or more reactive groups.

In a preferred embodiment of the present invention, the self-healing material may be a functional siloxane, such as a siloxane prepolymer or a polysiloxane having two or more reactive groups. Examples of functional siloxanes may be silanol-functional siloxanes, alkoxy-functional siloxanes, aryl or vinyl-functional siloxanes. The polysiloxane may be linear or branched, or a crosslinked polymer. Examples of polysiloxanes are poly (dimethylsiloxane), poly (methylsiloxane), partially alkylated poly (methylsiloxane), poly (alkylmethylsiloxane), and poly (phenylmethylsiloxane) (PDMS).

In another preferred embodiment of the invention, the polymerizable material comprises an epoxy-functional monomer, prepolymer or polymer, and also contains cyclic olefins, preferably 4 to 50 carbon atoms and optionally heteroatoms For example, DCPD, substituted DCPD, norbornene, substituted norbornene, cyclooctadiene, and substituted cyclooctadiene.

In another preferred embodiment of the present invention, it is possible for the polymerizable material to react with two different materials to form a polymer. For example, a polysiloxane formed by the reaction of a silanol functional polysiloxane with an alkoxy-functional polysiloxane, such as a polyether, a polyester, a polycarbonate, a polyene hydride, a polyamide, a formaldehyde polymer and a polyurethane, Lt; / RTI > For example, it is a combination of hydroxyl-terminated polydimethylsiloxane (HOPDMS) and polydiethylsiloxane (PEDS). Another example is a combination of a polyol and an isocyanate compound. It is a combination of polyol and isocyanate.

In the present invention, when the self-healing occurs, cracks are generated in the composite, and when the self-healing material meets with the self-healing material, the self-healing material flows to the cracked site and is polymerized. Do.

In the practice of the present invention, the polymerisation of the self-healing material may be induced by an activator included in the complex, for example, a polymerization initiator or a catalyst for polymerization. The activator may be incorporated in the coating layer in one embodiment and, in another embodiment, may be present in a capsule that is separate from the self-healing material.

In a preferred embodiment of the present invention, the activator is selected from the group consisting of di-n-butyltin di (meth) acrylate - Laurate can be used.

In the present invention, it is preferable that the capsules are formed so as to have a dense structure so that the substances in the capsules do not escape, and can be broken when cracks occur. In the practice of the present invention, the capsules may be made of a capsule made of polyurethane, in which case the compatibility of the polyurethane binder is favorable and even dispersion is possible.

In one embodiment of the present invention, the polyurethane capsules are prepared by reacting a polyol with a diisocyanate, and preferably 1,4-butanediol and TDI (toluene diisocyanate) are mixed in hexaun, For a period of time to produce a urethane precursor. The prepared urethane precursor was dissolved in chlorobenzene, and DBTL (di-nbutyltindi-laurate), which is a reaction catalyst, was mixed with distilled water and reacted at 70 ° C. for 2 hours and then dried to obtain carbon nanotubes and activator Thereby obtaining a microcapsule. Sieving is possible to obtain capsules of more uniform size.

In the present invention, the rubber chip may be a reclaimed rubber chip obtained by pulverizing a waste rubber, a petroleum resin or the like, or a new material elastic rubber chip such as polyurethane or EPDM. Since the physical properties of the waste tires are constant, they can be used in a uniform size regardless of the type. In the case of waste polyurethane, shredded polyurethane chips can be used in shoes, refrigerators, sheets and the like It is preferable that the various urethane used are selected by crushing and scrapped. In the case of new rubber chips, EPDM, polyurethane, etc. can be used and they can be purchased commercially.

In the practice of the present invention, it is preferable that the rubber chip is used without any additional surface treatment so as not to affect the elasticity of the rubber, such as the reclaimed rubber or the rubber. In the present invention, it is preferable that the rubber chip size is a synthetic grass filler having a diameter of about 1-10 mm, preferably about 2-5 mm, in consideration of strength, elasticity and tensile properties.

In the present invention, the binder coating layer is understood to mean a polymer binder coating layer. The polymer binder may be a urethane or acrylic binder, and may be an aqueous or oil based type. Urethane may be a one-component type such as a moisture-curing type or a liquid-type type requiring a separate crosslinking agent. It is possible.

In the present invention, the coating layer may further comprise a pigment for color control. The pigment may be an organic or inorganic pigment capable of developing green color so as to form a color coated chip such as green. The pigment may be used in an amount of preferably 0.1 to 1 part by weight, more preferably 0.2 to 0.5 part by weight based on 100 parts by weight of the rubber chip.

In the present invention, the coating layer may be formed by mixing a capsule containing a heat insulating material, an antistatic agent and an activating agent, and a capsule containing a self-healing substance, and then curing the mixture. The thickness of the coating layer may be 300-1000 micrometers, preferably 600-900 micrometers.

The filler for artificial turf according to the present invention includes capsules in which a self-healing material is contained in a surface coating layer in a chip form. Therefore, exposure of the internal rubber due to breakage or peeling of the coating layer due to incorporation of a heat insulating material and an antistatic agent I will stop. In addition, it is possible to increase the durability of the coated chips by restoration through surface healing.

Hereinafter, the present invention will be described in detail with reference to examples. The following examples are intended to illustrate the invention and are not to be construed as limiting the scope of the invention in any way. Various modifications and substitutions that can be ordinarily practiced by those skilled in the art are possible in the above-described embodiments.

Example:

Manufacture of microcapsules

21.85 g of toluene-2,4-diisocyanate were mixed with 141.65 g of cyclohexanone with stirring. While the mixture was being stirred, 4.12 g of 1,4-butanediol was gradually added and reacted at 80 DEG C for 24 hours. After reaction, cyclohexanone was evaporated under a vacuum of 100 DEG C to synthesize a urethane precursor.

2.91 g of the synthesized urethane precursor was dissolved in 12.5 g of chlorobenzene, and then PDES (polydiethoxysiloxane) / HOPDMS (hydroxy-functionalized polydimethyl siloxane) mixed at a ratio of 1:35 was dissolved in 9 g of chlorobenzene. Then, 3.75 g of Gum Arabic Mixed with 25 g of distilled water, and reacted at 70 DEG C for 2 hours to obtain microcapsules containing a healing substance.

Preparation of coating liquid

1 part by weight of the above-prepared microcapsules, 0.01 part by weight of di-n-butyltinidine-laurate, 0.1 part by weight of a green pigment, 1 part by weight of TiO 2 as a heat insulating material and 100 parts by weight of an antistatic agent And 0.1 part by weight of carbon black.

Antistatic and For tea  Value Type Elastic chip  Produce

100 kg of a waste urethane chip having a particle size of about 2-3 mm was put into a cylindrical reactor, and the temperature of the reactor was raised to 60 캜 while stirring. The prepared coating liquid was gradually dropped over 2 hours, the temperature was raised to 80 占 폚 and the mixture was stirred for 5 hours. Thereafter, the temperature was gradually lowered, and the temperature was maintained for 8 hours with stirring to prepare a self-healing artificial turf filler chip having a green appearance.

Comparative Example

0.1 part by weight of a green pigment and 1 part by weight of TiO2 as a heat insulating material and 0.1 part by weight of carbon black as an antistatic agent were prepared in 100 parts by weight of a polyurethane binder. Next, 100 kg of waste urethane chips having a particle diameter of about 2 to 3 mm was put into a cylindrical reactor, and the temperature of the reactor was raised to 60 캜 while stirring. The prepared coating liquid was gradually dropped over 2 hours, the temperature was raised to 80 占 폚 and the mixture was stirred for 5 hours. Thereafter, the temperature was gradually lowered, and the temperature was maintained for 8 hours with stirring to prepare a synthetic grass filled chip having a green appearance.

Basic Properties

100 parts by weight of the green artificial turf filler prepared in Examples and Comparative Examples were mixed with 30 kg of this liquid type polyurethane binder and placed at a thickness of 5 cm and pressed at a temperature of about 100 to prepare a sample for physical property measurement, And heat resistance were measured and are shown in Table 1.

[Table 1]

The antistatic property is obtained by drying the chip at 80 ° C. for 24 hours at a relative humidity of 0%, holding it in an environment of 25 ° C. and a relative humidity of 50% for 10 hours, rubbing the dried ABS resin board 10 times in the cloth, , And then it is judged to be charged to the degree of the chip adhered to the ABS board.

Good chargeability: Almost no adhesion.

Defective charging: Over 50%.

Decrease in chargeability: between good and bad

* Color: Visually observe the appearance of the chip surface.

[0154] The heat-generating green synthetic grass filler prepared in Examples and Comparative Examples was filled into a square plate (depth: 10 cm) of 1 m 2, and near infrared rays and infrared rays were mixed and radiated.

[Table 2]

Good heat-shrinkability In a 30-minute irradiation,

Defects in heat resistance: 60 ℃ or more in 30 minutes irradiation

Reduced heat sensitivity 50 ~ 60 ℃ in 30 min irradiation

* Self-Healing Test

The artificial turf filler prepared in Examples and Comparative Examples was subjected to 50 cycles of 50% compressing and restoring the chips, and then the filler chips of the examples and comparative examples exposed to the cycle were allowed to stand at 40 ° C for one week. After one week, 100 parts by weight of the filler and 30 kg of the liquid polyurethane binder were mixed with the artificial turf filler through a 50% compression and restoration cycle of 50% of chip, followed by laying to a thickness of 5 cm and compression at a temperature of about 100, A sample for measurement was prepared, and physical properties, antistatic properties and heat resistance were measured, and the results are shown in Tables 3 and 4.

[Table 3]

[Table 4]

Summary of results

In the case of the filler materials containing the self-healing material, the surface coating layer was restored through the self-healing process after the first compression cycle test and no peeling or breakage occurred after the second compression cycle test, In the case of the example, after the primary compression cycle test, it was not restored, and after the secondary compression cycle test, the physical properties, heat resistance and antistatic properties were deteriorated.

Claims (4)

0.1 to 10 parts by weight of an antistatic agent, 0.1 to 10 parts by weight of an antistatic agent, and 0.1 to 10 parts by weight of a self-healing polyurethane capsule containing a self-healing monomer on the surface of the reclaimed or novel rubber chip, Wherein the polymerization catalyst of the self-healing monomer is dispersed in the polyurethane binder coating layer, and the polymerization catalyst of the self-healing monomer is dispersed in the polyurethane binder coating layer. delete The artificial turf filler material according to claim 1, wherein the coating layer further comprises a pigment. [2] The grass-filling artificial grass filler according to claim 1, wherein the coating layer has a thickness of 300-1000 micrometers.