KR20140088378A - Filling chip for artificial turf and process thereof - Google Patents

Abstract

The present invention relates to a filling chip for artificial turf and a manufacturing method therefor. The filling chip for artificial turf contains 35-70 wt% of inorganic filler; 10-40 wt% of polylatic acid; 10-30 wt% of a plasticizer; 3-10 wt% of an anti-crystallization agent selected from acrylate resin; 0.1-5 wt% of a chain elongation agent; and 0.05-2 wt% of an anti-hydrolysis agent added as necessary. The manufacturing method for a filling chip according to the present invention is provided to manufacture the filling chips for environment-friendly artificial turf by using polylactic acid which is a biodegradable polymer.

Description

Technical Field [0001] The present invention relates to a filling chip for artificial turf,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filling chip for artificial turf, and more particularly, to a filling chip for artificial turf applying an environment-friendly material and a manufacturing method thereof.

Artificial turf is artificial turf with synthetic fiber as a substitute for natural turf. Since its first production in the United States in 1956, it has been used primarily in sports arenas and can be used in indoor gardens where natural grass can not be grown or in outdoor areas such as high rise buildings with limited sunshine hours. Artificial turf can maintain constant color irrespective of seasons. It is not restricted by environmental conditions and it is easy to manage after construction. It is widely used in indoor baseball field, soccer field, field hockey field, various indoor interior facilities and leisure facilities have.

Artificial turf is generally composed of a pile composed of synthetic resin such as polyvinylidene chloride (PVC), polyethylene (PE), and polypropylene (PP), a rubber powder for filling and supporting lawns and serving as a cushion Chip) and silica sand. At this time, thermoplastic synthetic rubber is mainly used as the material of the filling chip for artificial turf. For example, styrene butadiene rubber (SBR), styrene-butadiene-styrene block copolymer, styrene-ethylene-butadiene-styrene block copolymer, ethylene-propylene-diene monomer Ethylene Propylene Diene Monomer, EPDM), polyurethane chips, and thermoplastic olefinic synthetic rubbers. These are mainly petrochemical products based on fossil fuels.

Therefore, there has been a controversy about the harmfulness to the human body in the case of artificial turf filling chips to which these materials are applied. For example, Polynuclear Aromatic Hydrocarbons (VOC), which are known as carcinogens and heavy metal components, volatile organic compounds , PAH) as well as carbon dioxide, which is an environmental problem. In addition, since the content of the filler is usually as high as 50 to 70% by weight, it is hardly utilized as a reclaimed resin.

Further, in the case of a synthetic chip for artificial turf using these resins, a paraffin-based oil is used for imparting ductility. However, when artificial turf is used for a long period of time, these paraffinic oils contained in the filling chip may be discharged outside the resin, which may have a serious effect on the human body and the environment. In addition, the artificial lawn filling chip manufactured according to the conventional method can not be decomposed even after 100 years even if it is buried in the ground. Therefore, it is possible to cause serious environmental damage by selling substances causing environmental pollution in the soil for a long period of time have.

In Korea, artificial turf is widely used in sports facilities managed by schools and local governments. According to one data, about 14,000 facilities are currently under construction for artificial turf, and about 3,500 are currently being constructed and about 10,000 are planned to be constructed over the next 10 years. Generally, the use time of artificial turf is about 7 years, and the demand of artificial turf filler chip is usually about 3000 tons per year. Considering this point, it is expected that more than 30,000 tons of filling chips will be used for artificial turf construction in 10 years. If the filling chip manufactured by the present method is used as it is, it may be buried in soil and cause environmental pollution will be.

In other words, if about 10,000 artificial lawns, which are expected to be constructed within the next 10 years, are used in a conventional way, which can adversely affect the environment, these filling chips act as a cause of soil pollution and environmental pollution, It can cause serious environmental pollution mainly in the physical education facilities and schools all over the country.

Therefore, there is a need to develop an environmentally friendly material, for example, a synthetic chip for artificial turf, which can be decomposed naturally even when buried in the ground, but which has sufficient strength when used in artificial turf.

Published Patent No. 20-2010-0006016 "Filling chip for artificial turf made of loess" Registered Patent No. 10-1084872 "A method of manufacturing a base layer for artificial turf by recycling spent artificial turf and its artificial turf base layer" Registration No. 10-1037137 "Composition for artificial turf and filler for artificial turf using thereof" No. 10-1163051 entitled "Filler for Artificial Turf with Multiple Elastic Chips Connected and Artificial Turf Structure Using It"

It is an object of the present invention to provide a filling chip for artificial turf which can be manufactured using environmentally friendly materials and a method for manufacturing the filling chip.

Another object of the present invention is to provide a filling chip for artificial turf having good physical properties such as impact absorbing ability and a method of manufacturing the same.

According to an aspect of the present invention, there is provided a filling chip for artificial turf having an inorganic filler in an amount of 35 to 70% by weight; 10 to 40% by weight of polylactic acid; 10 to 30% by weight of a plasticizer; 3 to 10% by weight of a crystallization inhibitor selected from acrylate resins; 0.1 to 5% by weight of a chain extender and 0.05 to 2% by weight of moisture release.

Preferably, the polylactic acid can be mixed with the crystalline polylactic acid and the amorphous polylactic acid in a weight ratio of 1: 2 to 4.

The inorganic filler is characterized by being at least one selected from the group consisting of calcium carbonate, talc, fused silica, magnesium bicarbonate, and aluminum hydroxide.

At this time, the inorganic filler may be surface-treated with a fatty acid, a fatty acid salt, a silane coupling agent, a titanium coupling agent, a zirconium coupling agent and an aluminum coupling agent.

For example, the silane coupling agent can be selected from the group consisting of 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2- (3-acryloxy-2-hydroxypropyl) -3-aminopropyltriethoxysilane, (3-acryloxypropyl) (Trimethylsilyloxy) silane, (3-acryloxypropyl) methyldimethoxysilane, 3- (N-arylamino) propyltrimethoxysilane, aryldimethoxysilane, 2- (3-cyclohexenyl) ethyl] trimethoxysilane, 5- (bicyclopentadienyl) trimethoxysilane, 2- (3-cyclopentadienylpropyl) triethoxysilane, 1,1-diethoxy-1-silylacrylophen-3-ene, (3-methacryloyl-2-hydroxypropyl) -3-aminopropyl (3-methacryloyloxyethyl) triethoxysilane, O- (Methacryloyloxymethyl) bis (trimethylsiloxy) methylsilane, (methacryloyloxymethyl) dimethylethoxysilane, methacryloyloxymethyltriethoxysilane, methacryloxymethyltrimethoxysilane, 3 (Meth) acryloxypropylbis (trimethylsiloxy) methylsilane, methacryloxypropyldimethylmethoxysilane, methacryloxypropyldimethylmethoxysilane, methacryloxypropylmethyldiethoxysilane, methacryloxypropylmethyldimethoxysilane, Methacryloxypropyltris (methoxyethoxy) silane, methacryloxypropyltris (vinyldimethoxysilane) silane, 3- (N-styrylmethyl-2- Aminoethylamino) -propyl Aminopropyltrimethoxysilane, N-2- (aminoethyl) -3-aminopropyltrimethoxysilane, N-2- 3-aminopropyltriethoxysilane, 3-triethoxysilyl-N- (1,3-dimethyl-butylidene) propylamine, N Aminopropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, N- (vinylbenzyl) -2-aminoethyl-3-aminopropyltrimethoxysilane hydrochloride, 3-ureidopropyltriethoxysilane, 3- Methoxysilane, 3-glycidyloxypropyltrimethoxysilane, 3-glycidyloxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-mercaptopropyltrimethoxysilane, 3 Mercaptopropyltrimethoxysilane, mercaptopropyltriethoxysilane, 3-mercaptopropylmethyldimethoxysilane, bis (triethoxysilylpropyl) tetrasulfide, 3-isocyanatopropyl Triethoxysilane, 3-isocyanatopropyltrimethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, 3-aminopropylmethyldiethoxysilane and 2- (3,4-epoxycyclohexyl) Lt; / RTI > silane. Preferably, it may be selected from the group consisting of tetramethoxysilane, tetraethoxysilane, dimethoxyacrylosilane, diethoxyacrylosilane, dimethoxypropylaminosilane, diethoxypropylaminosilane, and combinations thereof.

The fatty acid may also be selected from the group consisting of decanoic acid (capric acid), dodecanoic acid (lauric acid), tetradecanoic acid (myristic acid), hexadecanoic acid (palmitic acid ), Octadecanoic acid (stearic acid), 9-octadecenoic acid (oleic acid), 9,12-octadecadienoic acid (linoleic acid), 9,12,15 Linolenic acid, arachidic acid (eicosanoic acid), 5,8,11,14-eicosatetraenoic acid (arachinonic acid), 13-octadecatrienoic acid (arachidonic acid) At least one selected from the group consisting of docosanoic acid (erucic acid), 7,10,13,16,19-docosapentaenoic acid, and the like; The fatty acid salt may include at least one fatty acid metal salt selected from the group consisting of zinc stearate, calcium stearate, sodium stearate, magnesium stearate, aluminum stearate, sodium oleate, zinc oleate and zinc palmitate.

On the other hand, the plasticizer that can be used in accordance with the present invention is a vegetable oil or a vegetable plasticizer containing citrate salts substituted with at least one, preferably three, alkyl of 1-10 carbon atoms.

 The vegetable oil may be selected from the group consisting of soybean oil, castor oil, palm oil, coconut oil, corn oil, sunflower seed oil, waste cooking oil and epoxidized soybean oil.

On the other hand, the crystallization inhibitor may be an acrylate-based (co-ternary) polymer having a core / shell structure. For example, the monomer constituting the core may be a linear or branched alkyl- To 30 wt%, methyl methacrylate 10 to 80 wt%, and styrene monomer 10 to 60 wt%.

On the other hand, the cell comprises 1 to 40% by weight of a first monomer selected from methacrylic acid, vinylimidazole, N-vinyl-2-methylimidazole and combinations thereof; And 60 to 99% by weight of a second monomer composed of an alkyl methacrylate having a straight-chain or branched alkyl group having 1 to 7 carbon atoms.

In addition, the chain extender may include a glycidyl acrylate-based or glycidyl methacrylate-based copolymer or a terpolymer.

For example, the chain extender may comprise 10 to 60% by weight of glycidyl acrylate or glycidyl methacrylate; And 10 to 50% by weight of a monomer composed of alkyl methacrylate, alkyl acrylate, and styrene, or a terpolymer.

On the other hand, the moisture release may include a carbodiimide compound. Specifically, the moisture release may be performed using di (2,6-diisopropylphenyl) carbodiimide, dicyclohexylcarbodiimide, diiso Propyl carbodiimide, poly-2,4,6-isopropyl carbodiimide, and combinations thereof.

According to another aspect of the present invention, there is provided a method for manufacturing a filling chip for artificial turf, which comprises: preparing an inorganic filler comprising 35 to 70% by weight of an inorganic filler, 10 to 40% by weight of polylactic acid, 10 to 30% by weight of a plasticizer, From 3 to 10% by weight, from 0.1 to 5% by weight of a chain extender, and from 0.05 to 2% by weight of moisture release; Extruding the compound obtained in the compounding step; And cutting the extruded formulation to form a filler chip in the form of a pellet.

For example, the step of forming the pellet-type filling chip may include cutting the extruded blend by a water-cooled cutting or a hot-cutting method.

If necessary, the inorganic filler may be surface-treated with a fatty acid, a fatty acid salt, a silane-based coupling agent, a titanium-based coupling agent, a zirconium-based coupling agent or an aluminum-based coupling agent before the mixing step.

The present invention proposes a filling chip for artificial turf made of polylactic acid having a sufficient strength as a biodegradable polymer as a main material. Therefore, when the artificial turf has a short life, the filling chip of the present invention is buried in the ground, and the artificial turf is filled with environmentally-friendly synthetic grass. In particular, according to the embodiment of the present invention, harmful metal components are not detected at all and can be used safely and harmless to human body.

On the other hand, when it is used as a filling chip for artificial turf, it is expected to be used as a filling chip for artificial turf for 10 years or more because it is not easily hydrolyzed and has sufficient strength.

FIG. 1 is a block diagram schematically showing a manufacturing process of an environmentally friendly artificial turf filling chip according to the present invention.

DISCLOSURE OF THE INVENTION The present inventors have studied a method for solving the problems of conventional artificial turf filling chips and used a biodegradable resin and studied a method for solving the disadvantages of the biodegradable resin to complete the present invention. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

A. Filled Chip for Artificial Turf

The filling chip for artificial turf according to the present invention comprises polylactic acid (PLA), which is one of an inorganic filler and a biodegradable polymer, as a main component, and as a functional additive to complement the disadvantages of polylactic acid, An inhibitor, a chain extender and, if necessary, a dehydrating agent. Hereinafter, each of these components will be described.

1. Poly lactic acid (PLA)

As a polymer resin of a filling chip for artificial turf according to the present invention, a biodegradable polymer, polylactic acid, is used. Various kinds of biodegradable polymers are known, but polylactic acid has excellent crystallization properties and relatively high melting point. Polylactic acid (PLA), also referred to as polylactide, is a thermoplastic aliphatic polyester derived from renewable resources such as plant biomass, such as corn starch or tapioca obtained from roots of cassava to be.

Since the melting point of the polylactic acid is about 160 캜 or so, almost no denaturation occurs due to heat, and since the polylactic acid exists in a crystallized state, it can have sufficient strength. The polylactic acid can be synthesized, for example, by a ring-opening reaction using a metal catalyst for a monomeric lactic acid or its cyclic di-ester lactide, or directly from a lactic acid monomer at a temperature below 200 ° C have.

At this time, for example, when potato or corn starch is prepared in a microbial culture process, lactide, which is a monomer, can be obtained. Polymeric polylactic acid can be prepared by condensation polymerization of the monomer. In the case of direct synthesis, an oligomer form is usually synthesized first, and ultimately a polylactic acid having a high molecular weight, for example, 120 to 155 kDa can be synthesized through condensation of these oligomers.

With respect to the present invention, polylactic acid, which is a biodegradable resin, can be used in a proportion of 10 to 40% by weight in the filling chips for artificial turf. If the content of polylactic acid is less than the above-mentioned range, it is difficult to obtain sufficient strength as a filling chip. If the content of polylactic acid exceeds the above-mentioned range, the content of other components decreases so much that the processing step becomes difficult, .

Although the polylactic acid has a disadvantage of being broken by the nature of the resin, it is not only excellent in crystallinity and strength, but also is completely hydrolyzed by soil moisture when it is buried in the soil and then completely biodegraded by soil microorganisms. According to the industry, it is known that complete biodegradation proceeds over three to five years in soil. Also, if it is left in a natural state without being buried in the soil (for example, used as a filling chip for artificial turf like in the present invention), it can not be easily hydrolyzed and can be used as a product with a durability of 10 years or more.

As described above, the filling chip for artificial turf of the present invention using polylactic acid, which is a biodegradable polymer, as a resin is harmless to the human body because it is eco-friendly and is completely biodegraded by microorganisms within several years even if buried in soil. Thus, it can become a nutrient that will help grow plants, especially corn, and become a natural cycling friendly artificial turf filling chip. It can be recycled in nature without collecting it and using it as recycled resin to produce other molded articles.

In addition, lactide as a monomer of polylactic acid, which is a biodegradable resin according to the present invention, is not a petrochemical product extracted from a fossil raw material, but is a material extracted from corn, so it can be freely freed from carbon dioxide emission right. Lactic acid (lactic acid), which is the cause of sour taste, is used as the main raw material, there is no adverse effect on the human body.

Due to such characteristics of the material, the filling chip for artificial turf according to the present invention is a completely eco-friendly material and does not cause problems such as environmental pollution and soil pollution even when buried in soil. Therefore, We can actively cope with regulations.

The polylactic acid may be classified into a crystalline polylactic acid and a non-crystalline polylactic acid according to the raw material and / or synthetic process to be used. Preferably, the polylactic acid is a crystalline polylactic acid and a non- A crystalline polylactic acid is mixed and used. For example, when only crystalline polylactic acid is used, processing may be difficult, and when only non-crystalline polylactic acid is used, it is difficult to obtain sufficient strength.

As can be seen from the molecular structure, one of the carbons constituting the lactide used as the monomer of the polylactic acid has a hydrogen atom (H), a hydroxyl group (OH), a methyl group (CH ₃ ) and a carboxyl group There are two enantiomers, D-form and L-form, because they are chiral carbons linked together by four different substituents. Thus, in a typical synthesis process, a racemic mixture of D-form and L-form is formed, but the racemate is non-crystalline.

However, in the case of using a stereo-specific catalyst in the process of synthesizing polylactic acid, a crystalline polylactic acid can be obtained. The degree of crystallinity can be determined by measuring the degree of crystallinity of the L- The degree of crystallinity may vary depending on the ratio to the D-type enantiomer. For example, poly-L-lactide (PLLA) synthesized using L-form lactide as a monomer has good crystallinity. If necessary, polylactic acid (PDLA) synthesized by using D-type lactide as a monomer in PLLA is added to PLLA at a ratio of 3-50% by weight, preferably 3-10% by weight Even when blending, the glass transition temperature rises and still has crystallinity. In this case, PDLA acts as a nucleating agent to improve the temperature stability and further improve the crystallization ratio.

Considering this point, as the crystalline polylactic acid, those having 3-50 wt% of PDLA blended with PLLA or PLLA may be used. As the non-crystalline polylactic acid, D- As a racemic mixture of form and L-form, atypical polylactic acid (D, L-polylactide) can be used. In this case, preferably, the crystalline polylactic acid and the non-crystalline polylactic acid may be mixed and used in a weight ratio of 1: 2 to 4.

2. Materials for improving the physical properties of polylactic acid

On the other hand, polylactic acid to be used as a resin according to the present invention may be used as a filling chip for artificial turf which basically serves as a cushion because it may be difficult to process due to excessive crystallinity, And it may be difficult to use for a long time by a filling chip for artificial turf due to hydrolysis. However, when hydrolysis is completely inhibited, the time for biodegradation is greatly increased, which may not meet the purpose of environment friendliness.

Thus, the biggest obstacle to the production of polylactic acid-based filler chips for artificial turf is poor melting characteristics and very rigid properties. Therefore, it is necessary to improve the melting characteristics of such polylactic acid. Basically, by softening the hard polylactic acid, it can be utilized as a filling chip for artificial turf made of polylactic acid as a material. By properly controlling the hydrolysis, It is necessary to prevent the biodegradation time from becoming excessively long while being usable. Accordingly, in order to solve the problems of polylactic acid, the following components can be used to control the improvement of the melt characteristics, the degree of softening and the degree of hydrolysis.

1) Chain extender (Improvement of melting property of polylactic acid)

Although the non-crystalline polylactic acid may be used as the polylactic acid in combination with the crystalline polylactic acid according to a preferred embodiment of the present invention, more crystalline polylactic acid is used in order to maintain sufficient strength. Since the polylactic acid used as the filling chip for artificial turf according to the present invention is a crystalline plastic material, when the temperature of the polylactic acid is raised above a certain temperature in the processing step, the melt viscosity and the melt strength rapidly decrease and flow like water having a low viscosity, It can be difficult.

Such poor melting properties of polylactic acid may fundamentally impair processing because the melting behavior of the resin is very sensitive to the processing temperature. In the case of most crystalline resins, in particular, polyesters such as polyethylene terephthalate (PET), there is no supplement of special equipment and that is why the production of films is impossible.

Accordingly, in the present invention, in order to improve the melting property of the resin itself by controlling the molecular weight of the polylactic acid, a chain extender capable of strengthening polymerization or intermolecular bonding of polylactic acid, Use a chain extender. As described above, the polylactic acid synthesized through a general synthetic process has an average molecular weight of about 150 KDa, and the polylactic acid resin under this condition can not be melt-processed.

Thus, in the present invention, by using the chain extender, the molecular weight of the polylactic acid can be increased to improve the melting property of the polylactic acid. In order to soften the polylactic acid as described later, a plasticizer should be added. When a plasticizer is added to the polylactic acid in the state not treated with the chain extender, the glass transition temperature (Tg) of the polylactic acid is rapidly decreased, The melting property may be degraded to an extent that is impossible. Therefore, when the chain extender is used to increase the molecular weight of the polylactic acid, for example, in a reactive extrusion process, the melt characteristics of the polylactic acid can be efficiently improved and improved, thereby contributing to establishment of the softening processing conditions .

In order to improve the melting characteristics of polylactic acid which is a biodegradable resin of a green chip for artificial turfgrass according to the present invention, a chain extender which can be used is a glycidyl acrylate type or glycidyl methacrylate type copolymer or May include a terpolymer, and particularly preferably a glycidyl methacrylate-based copolymer or a terpolymer.

For example, a copolymer or terpolymer of glycidyl methacrylate or glycidyl acrylate with monomers consisting of alkyl methacrylates, alkyl acrylates and styrenes. Although the present invention is not limited thereto, the content of glycidyl acrylate or glycidyl methacrylate as a monomer constituting the copolymer or the terpolymer constituting the chain extender of the present invention is 10 to 60% by weight , The content of monomers composed of alkyl methacrylate, alkyl acrylate and styrene which can constitute a copolymer or a terpolymer with these monomers is 10 to 50% by weight.

At this time, the chain extender, which may be, for example, a copolymer of the above-mentioned monomers or a terpolymer form, preferably has an average weight molecular weight of about 4,000 to 25,000. When the molecular weight is higher than this range, the number of reactive functional groups (functional groups) increases, but the reactivity may be lowered. Although the molecular weight can be controlled in the extrusion condition, the most preferable molecular weight of the chain extender is 10,000 to 15,000, more preferably 11,000 to 13,000.

In addition, the reactor equivalent of the chain extender that can be used in accordance with the present invention can range from about 200 to about 800, preferably from about 400 to about 500. The chain extender is preferably added in a proportion of 0.1 to 5.0% by weight based on the packed chip. If the content of the chain extender is less than the above-mentioned range, since the increase in the molecular weight of the polylactic acid is hardly achieved, it is difficult to achieve the effect of improving the melting of the polylactic acid. On the other hand, if the content of the chain extender exceeds the above range, the melt strength is excessively increased, which makes it impossible to discharge the extruder and the finished product may become too hard. Particularly preferably, the chain extender may be added in a proportion of 0.1 to 1.0% by weight, and this ratio may be varied flexibly depending on the content of the plasticized acrylic resin (crystallization inhibitor) to be described below .

For example, when the reactive chain extender is contained in a filler chip, the average molecular weight of the polylactic acid is increased to 300,000 to 450,000. When the extrusion process is performed, the melt quality is improved can do.

2) Softening (plasticizer and crystallization inhibitor)

Since polylactic acid is a hard material having high strength, it is difficult to use polylactic acid as a filling chip for artificial turf which needs to absorb shock without any treatment. Therefore, the rigid polylactic acid resin must be softened, but a plasticizer is used in the present invention.

The prerequisite for this is the environment friendliness of the plasticizer, the harmfulness of the human body, the natural friendliness, and the important technology is the compatibility of resin and plasticizer. If the compatibility is not ensured, the plasticizer dissolves out of the polylactic acid resin in a short period of time, changes with time, and hardens again. In order to solve this problem, it is possible to solve the problem by adding a resin having affinity for plasticizer and a suitable mixing ratio of the crystalline polylactic acid and amorphous polylactic acid.

As a plasticizer for softening polylactic acid which is a biodegradable material of a filling chip for artificial turf according to the present invention, it is possible to use a material which is most suitable for biodegradability and environment friendliness, for example, a citric acid series (Citrate) and vegetable oil series.

Examples of the citric acid-based plasticizer include a citric acid salt substituted by at least one alkyl group having 1-10 carbon atoms, preferably a citric acid salt substituted with at least two (for example, three) alkyl groups having 1-10 carbon atoms. For example, citric acid based plasticizers that can be used in accordance with the present invention include tributyl acetyl citrate, tributyl citrate, triethyl acetyl citrate, triethyl citrate, trihexyl citrate, trihexylacetyl citrate, tri Octyl citrate, trioctylacetyl citrate, and the like, but the present invention is not limited thereto. In this case, when triethyl citrate or triethyl acetyl citrate having a relatively small number of carbon atoms is used, it is necessary to use a relatively large amount (for example, 30 wt%) as compared with other citric acid type plasticizers because the chain length is short have. In this case, the amount of the calcining and the acrylic resin as the crystallization inhibitor to be described later is increased, which may cause the biodegradability to be deteriorated.

On the other hand, trihexyl or trioctyl citrate, which has a relatively large number of carbon atoms, has a long chain and is long, and even if it helps to soften the polylactic acid, since the polarity is low, the compatibility of acrylic and polylactic acid with high polarity tends to become hard Therefore, it is desirable to reduce the content relatively.

Therefore, tributyl acetyl citrate or tributyl citrate as a citric acid plasticizer may be particularly preferable in view of molecular weight and polarity. Tributyl citrate has high polarity and is highly compatible with polylactic acid. Even if a relatively small amount of polylactic acid is used, it can be softened. However, since OH groups remain, the polymer chain of polylactic acid tends to be cut off. . Most preferred is tributyl acetyl citrate, but two or more citric acid-based plasticizers may be mixed and used.

On the other hand, in addition to the aforementioned citric acid-based plasticizers, vegetable oils are also applied as environmentally friendly biodegradable plasticizers. Examples of vegetable oils that can be used herein include soybean oil, castor oil, palm oil, coconut oil, corn oil and sunflower seed oil. These vegetable oils are made up of stearic acid, linolenic acid and palmitic acid, which are the fattening fatty acids. In addition, epoxidized vegetable oils inducing a reaction centering on the above-mentioned vegetable oil may be possible, for example, epoxidized soybean oil. These vegetable oils may be used for the purpose of the present invention.

Thus, in connection with the technical approach of the present invention, the use of various kinds of vegetable oils can react with the epoxy groups of the chain extenders mentioned above, so that their migration can be suppressed, It can also be confirmed that the lactic acid resin easily mixes in the lactic acid resin.

Among the vegetable oils, soybean oil, waste edible oil, epoxidized soybean oil, and a mixture thereof are preferably obtained, which are preferably cheap and easily obtainable. Especially when compared with citric acid plasticizers, vegetable oils may be effective in softening polylactic acid. The amount of the plasticizer which can be selected from at least one of citric acid-based plasticizer and vegetable oil may be 10 to 30% by weight, preferably 10 to 20% by weight, in the case of the synthetic chip for artificial turf according to the present invention. The polylactic acid can be sufficiently softened through such an amount.

On the other hand, it is necessary to solve the compatibility of the polylactic acid and the plasticizer in the softening process of the polylactic acid by the plasticizer, for example, a vegetable oil component such as soybean oil. Particularly, since polylactic acid is a crystalline material, recrystallization proceeds over several days after the addition of the plasticizer. The polymer chain, which has been distant from the recrystallization process, is in close proximity to the crystallization degree. In this process, the plasticizer, which is contained in the plasticizer, is not only released to the outside of the resin but also begins to break due to the hardening of the polylactic acid resin and even bleeding at the edge. This is closely related to the compatibility between the polylactic acid and the plasticizer material, but requires a technical treatment that can fundamentally prevent recrystallization.

In the present invention, a crystallization inhibitor is used as a technical approach to prevent such phenomenon. As the crystallization inhibitor that can be used, an crystallization inhibitor as a plasticizer having a high molecular weight can be utilized. The addition amount of the crystallization inhibitor may be determined within a range that does not impair the biodegradability of the polylactic acid resin. For example, the crystallization inhibitor (polymer plasticizer) in the filling chips for artificial turf according to the present invention may be added in a range of 3 to 10 wt% to be. Particularly preferably, the crystallization inhibitor may be added in a proportion of about 4 to 7% by weight in consideration of the biodegradability of the polylactic acid which is the main material of the filling chips for artificial turf and the amount of the plasticizer used for softening the polylactic acid have.

Preferably, an acrylate resin having a core / shell structure as the crystallization inhibitor, more preferably an acrylate-based copolymer or an acrylate-based terpolymer can be used. Other components constituting the copolymer or the terpolymer include methyl methacrylate and / or styrene monomer.

At this time, among the monomer constituent components of the resin forming the core, the alkyl acrylate monomer may include linear or branched alkyl acrylates having 1 to 7 carbon atoms. For example, the alkyl acrylate monomers constituting the core include methyl acrylate, ethyl acrylate, n-propyl acrylate, i-propyl acrylate, n-butyl acrylate, n-butyl acrylate, Methacrylate, n-pentyl acrylate, amyl-pentyl acrylate, and the like. More preferably, it may be selected from the group consisting of methyl acrylate, ethyl acrylate, n-butyl acrylate, n-propyl acrylate, i-butyl acrylate and t-butyl acrylate.

If the core forms a copolymer or a terpolymer as a constituent of the crystallization inhibitor of the core / shell structure, the weight ratio of each monomer is not particularly a problem, but may be, for example, have. The alkyl acrylate as a main component is 10 to 30% by weight, preferably 10 to 20% by weight in the core. If the content of the alkyl acrylate in the core is less than the above-mentioned range, compatibility with the citric acid-based or vegetable oil-based plasticizer may be deteriorated. If the content of the alkyl acrylate exceeds the above range, This can lead to storage difficulties.

On the other hand, methyl methacrylate is 10 to 80% by weight, preferably 40 to 60% by weight, in the core constituting the crystallization inhibitor. If the content of methyl methacrylate in the core is less than the above range, migration of the plasticizer may occur after gelation. When the content of methyl methacrylate exceeds the above range, the glass transition temperature (Tg ) May become too high and the coating film may be easily damaged.

In addition, the styrene monomer which can be used as another component of the core may be contained in the core in an amount of 10 to 60% by weight, preferably 20 to 50% by weight. If the content of the styrene monomer in the core is less than the above-mentioned range, the storage stability may deteriorate. If the content of the styrene monomer exceeds the above range, the mechanical properties may deteriorate.

On the other hand, in the case where the crystallization inhibitor forms a core / shell structure, the shell (shell) comprises a first monomer which can be selected from methacrylic acid, vinylimidazole, N-vinyl-2-methylimidazole, , And alkyl methacrylate having a straight or branched alkyl group having 1-7 carbon atoms.

In this case, when the methacrylic acid, the vinylimidazole, and the N-vinyl-2-methylimidazole are used as the first monomer, the content ratio of these components is not particularly limited. On the other hand, as the alkylmethacrylate as the second monomer, at least one monomer selected from methyl methacrylate, n-butyl methacrylate and sec-butyl methacrylate is particularly preferably used.

Although the content ratio of the monomer component constituting the cell is not critical, it is preferable that the content of the first monomer 1 (e.g., methacrylic acid, vinylimidazole, N-vinyl-2-methylimidazole, To 40% by weight, preferably 1 to 20% by weight, of a second monomer which can be selected from one or more alkyl methacrylates, preferably 80 to 99% by weight.

The crystallization inhibitor which may be an acrylate resin having a core / shell structure according to the present invention not only inhibits the migration of the plasticizer but also inhibits the migration of the main chain of the polylactic acid due to the high molecular weight Physically interfere with the recourse to polylactic acid to prevent recrystallization, thereby inhibiting long-term resin softening and migration of the plasticizer.

3) I turn off moisture

As described above, since condensation type resins such as polylactic acid are relatively easily hydrolyzed, it is necessary to suppress the hydrolysis of polylactic acid. Hydrolysis is the most serious problem in the processing and commercialization of resins, and in particular polylactic acid is more susceptible to moisture than other condensation type resins and hydrolysis proceeds well. In addition, hydrolysis must be accompanied by such biodegradation. Therefore, it is necessary to appropriately control the hydrolysis of the polylactic acid. To this end, the filling chip for artificial turf according to the present invention includes dehydration which inhibits the hydrolysis of polylactic acid which is vulnerable to hydrolysis.

When the molecular weight is increased, for example, by using a chain extender to improve the melting property of the polylactic acid, the hydrolysis rate of the polylactic acid resin may be retarded. Therefore, proper dewatering can be appropriately added to produce a sufficient life time artificial turf filler chip.

The additive used may be carbodiimide, specifically di (2,6-diisopropylphenyl) carbodiimide, dicyclohexylcarbodiimide, and diisopropylcarbodiimide. In addition, Among them, poly-2,4,6-isopropylcarbodiimide and the like can be used. The hydrolysis of the polylactic acid can be efficiently controlled by using the water release. In particular, it is preferably di (2,6-diisopropylphenyl) carbodiimide. The moisture release can be used in a proportion of 0.05 to 2% by weight in the filling chip for artificial turf according to the present invention, and an addition amount of 0.1 to 1.0% by weight may be particularly preferable.

3. Inorganic filler

In order to control the specific gravity, it is necessary to add a high-boiling inorganic filler to the filling chip for artificial turf. If the filling chip is too light, it can not be properly fixed or scattered. Typically, the specific gravity of artificial turf filler chips according to KS regulations is about 1.2 to 1.5. In order to meet the weight of this level, the artificial turf filler chips contain 35 to 70% by weight, preferably 40 to 60% % ≪ / RTI > by weight.

Examples of the inorganic filler that can be used as a constituent of the artificial turf filling chip of the present invention include calcium carbonate (brittle), talc, fused silica, magnesium bicarbonate, aluminum hydroxide, magnesium hydroxide and combinations thereof. (Clay), barium sulfate, calcium sulfate, loess and bioceramics.

Particularly, among these inorganic filler components, components such as calcium carbonate, talc, magnesium bicarbonate and calcium sulfate are alkaline, so that the chain of polylactic acid saponin can be cut to lower the melt strength, Do.

In other words, although fillers such as calcium carbonate and talc can be used universally, these components are obtained from marine rocks, which are basically basic components. Considering that the hydrolysis of the polylactic acid resin occurs mainly in acidic and basic conditions, when these basic or acidic fillers are used, the hydrolysis of the polylactic acid, which is one of the condensed ester resins, There may be a need to do so.

For example, when a basic or acidic filler is added and added to a formulation for a filling chip containing polylactic acid without any treatment, the hydrolysis of the polylactic acid proceeds during the processing and the molecular weight is lowered, It becomes impossible. Hydrolysis of polylactic acid rapidly progresses within a short period of time (usually within a few weeks) even when a molded article is difficult to produce, so that a phenomenon that breaks easily occurs.

In order to solve this problem, a surface treatment can be carried out using a coupling agent to an acidic or basic inorganic filler. Or metal hydroxides having neutral properties can be used.

For example, as the component which can be used for the surface treatment before the basic or acidic filler, a fatty acid salt such as a fatty acid or a metal fatty acid salt, a silane series, an aluminum series, a titanium series or a zirconium series coupling agent can be used. These surface treating agents for surface coating and surface reaction can be sufficiently achieved if they are 0.1 to 1% by weight based on the weight of the inorganic filler.

Examples of the fatty acid which can be used for the surface treatment and / or coating treatment of the inorganic filler include fatty acids having a straight-chain or branched-chain hydrocarbon group having 10 to 30 carbon atoms such as decanoic acid Capric acid), dodecanoic acid (lauric acid), tetradecanoic acid (myristic acid), hexanedecanoic acid (palmitic acid), octadecanoic acid (stearic acid (oleic acid), 9,12-octadecadienoic acid (linoleic acid), 9,12,15-octadecatrienoic acid (linolenic acid (eicosanoic acid), arachidonic acid (eicosanoic acid), 5,8,11,14-eicosatetraenoic acid (arachinonic acid), 13-docosenoic acid (erucic acid ), And saturated or unsaturated fatty acids such as 7,10,13,16,19-docosa penta-enoic acid can be used.

On the other hand, fatty acid metal salts such as zinc stearate, calcium stearate, sodium stearate, magnesium stearate, aluminum stearate, sodium oleate, zinc oleate, zinc palmitate and the like can be used.

Examples of the silane coupling agent include 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxy-ethoxy ) -Silane, 2- (acryloxyethoxy) trimethylsilane, N- (3-acryloxy-2-hydroxypropyl) -3-aminopropyltriethoxysilane, (3-acryloxypropyl) dimethylmethoxysilane (Trimethylsilyl) silane, (3-acryloxypropyl) methyldimethoxysilane, 3- (N-arylamino) propyltrimethoxysilane, aryldimethoxysilane, aryl (3-cyclohexenyl) ethyl] trimethoxysilane, 5- (bicycloheptenyl) tri (methoxycarbonyl) triethoxysilane, butenyl triethoxysilane, 2- Triethoxysilane, (3-cyclopentadienylpropyl) triethoxysilane, 1,1-diethoxy-1-silylacrylophen-3-ene, (peryloxymethyl) Hydroxypropyl) -3-aminopropyltriethoxysilane, N- (3-methacryloyl-2-hydroxypropyl) -3-aminopropyltriethoxysilane, N- (Methacryloyloxymethyl) bis (trimethylsiloxy) methylsilane, (methacryloxymethyl) dimethylethoxysilane, methacryloxymethyltriethoxysilane, methacryloxymethyltrimethoxysilane, 3-methacryloxypropyl (Meth) acryloxypropyldimethylmethoxysilane, methacryloxypropyldimethylmethoxysilane, methacryloxypropylmethyldiethoxysilane, methacryloxypropylmethyldimethoxysilane, (3-acryloxy (Meth) acryloxypropyltris (methoxyethoxy) silane, methacryloxypropyltris (vinyldimethoxysilane) silane, 3- (N-styrylmethyl-2-aminoethylamino) Propyl trimethoxysilane, Aminopropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, N-2- (aminoethyl) -3-aminopropyltrimethoxysilane, N-2- (aminoethyl) (1,3-dimethyl-butylidene) propylamine, N-phenyl-3-aminopropyltriethoxysilane, -Aminopropyltrimethoxysilane, N- (vinylbenzyl) -2-aminoethyl-3-aminopropyltrimethoxysilane hydrochloride, 3-ureidopropyltriethoxysilane, 3-chloropropyltrimethoxysilane, Glycidyloxypropyltrimethoxysilane, 3-glycidyloxypropyltrimethoxysilane, 3-glycidyloxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-mercaptopropyltrimethoxysilane, 3- Triethoxysilane, 3-mercaptopropylmethyldimethoxysilane, bis (triethoxysilylpropyl) tetrasulfide, 3-isocyanatopropyltriethoxysilane , 3-isocyanatopropyltrimethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, 3-aminopropylmethyldiethoxysilane and 2- (3,4-epoxycyclohexyl) -ethyltrimethoxysilane. . But it is preferably selected from the group consisting of tetramethoxysilane, tetraethoxysilane, dimethoxyacrylosilane, diethoxyacrylosilane, dimethoxypropylaminosilane, diethoxypropylaminosilane, and combinations thereof, more preferably Is dimethoxyacrylsilane.

Examples of the titanium-based coupling agent include isopropyltriisostearothiotitanate, isopropyltriodioctylphosphototitanate, tetraisopropyldidiarylphosphotitotitanate, titaniumdioctylphosphate oximacetate, Stearoyl ethylene titanate, and the like.

As the zirconium-based coupling agent, zirconium tetraenopropoxide, zirconium isopropoxide, zirconium butoxide or zirconium tetrachloride can be used. As the aluminum-based coupling agent, aluminum ethoxide, aluminum isopropoxide, aluminum N-butoxide or tributoxy aluminum may be used.

In addition, metal hydroxide such as aluminum hydroxide, magnesium hydroxide, and fused silica, which are usable inorganic fillers, can be added and processed without any surface treatment, and aluminum hydroxide is most preferable. For example, if the inorganic filler is used in an amount of 35 to 70% by weight in the artificial grass filling chip composition, softness and specific gravity can be controlled, preferably 40 to 60% by weight.

As a result, according to the present invention, it is possible to manufacture an environmentally friendly artificial lawn filling chip by solving the technical limitations of the rigidity and breakage of the biodegradable polymer, polylactic acid, and the difficulty of the processing step.

Meanwhile, the filling chip for artificial turf of the present invention may further contain other functional additives besides the polylactic acid resin, the inorganic filler, the chain extender, the plasticizer, the recrystallization inhibitor, and the moisture release agent. Examples of such functional additives include an antioxidant, a heat stabilizer, a UV stabilizer, an antistatic agent, and a slip agent. These functional additives may be used in an amount of about 0.01 to 0.5 wt% in a filling chip for artificial turf.

B. Manufacturing method of artificial grass filling chip

A method of manufacturing a synthetic grass filling chip according to the present invention will be described with reference to FIG. FIG. 1 is a block diagram schematically showing a manufacturing process of an environmentally friendly artificial turf filling chip according to the present invention. As shown in the figure, the manufacturing process of the filling chip for artificial turf according to the present invention includes a mixing step (S110), an extrusion step (S120) and a pelletizing step (S130) And a packaging step (S150).

First, components constituting the artificial grass filling chip according to the present invention are compounded at room temperature (S110). For example, the artificial turf filling chip according to the present invention comprises 35 to 70 wt% of inorganic filler, 10 to 40 wt% of polylactic acid, 10 to 30 wt% of plasticizer, 3 to 10 wt% of crystallization inhibitor selected from acrylate- From 0.1 to 5% by weight of chain extender, and from 0.05 to 2% by weight of moisture release. If necessary, functional additives such as an antioxidant, a heat stabilizer, a UV stabilizer, an antistatic agent, and a slip agent may be contained in the composition in an amount of, for example, 0.01 to 0.5% by weight, respectively.

Preferably, the polylactic acid may be a mixture of crystalline polylactic acid and amorphous polylactic acid in a weight ratio of 1: 2 to 4, and the inorganic filler may be calcium carbonate, talc, fused silica, magnesium bicarbonate, And at least one kind selected from the group consisting of If a non-neutral component such as calcium carbonate, talc, or the like, which is a basic component, is used as the inorganic filler, an appropriate surface treatment may be performed before compounding the inorganic filler into the artificial turf filler chip composition. As an example of the surface treatment, it may be considered to treat the surface of a basic or acidic inorganic filler by using a silane coupling agent, a fatty acid or a fatty acid salt.

On the other hand, the plasticizer contained in the combination may be a vegetable oil or a vegetable plasticizer containing a citric acid salt substituted with alkyl of 1-10 carbon atoms. The crystallization inhibitor may be an acrylate-based copolymer having a core / shell structure, and the chain extender may include a glycidyl acrylate-based or glycidyl methacrylate-based copolymer or a terpolymer. In addition, the moisture release can be a carbodiimide compound.

After mixing the above components constituting the artificial turf filling chips, if necessary, a pre-mix step for the extrusion process is carried out to improve the melt processing characteristics for increasing the molecular weight of the polylactic acid, softening the polylactic acid, Improvement in compatibility, and control of the hydrolysis resistance can be given. A kneader-mixer may be used for compounding and / or premixing the components making up the artificial grass filling chip.

After the compounding step (S110), these components are extruded through an extruder (S120). The kind of the extruder is not particularly limited, but a single screw extruder or a twin extruder can be used, for example. In this case, the effective length (L / D ratio: length-diameter ratio) obtained by dividing the total length of the screw spiral part constituting the extruder by the diameter of the screw may be in the range of 20 to 30, 150 to 300 rpm, and the temperature of the extruder may be adjusted to about 150 to 300 DEG C, preferably about 180 to 260 DEG C.

A pelletizing step (S130) may then be performed to cut the extruded formulation through the extrusion step (S120) to form a pellet-shaped filled chip. At this stage, the extruded blend is cut to a suitable size by employing a water-cooling type cutting method or a hot cutting method.

After the pelletization step S130, a step S140 of selecting only the filling chips suitable for commercialization, taking into consideration the shape (shape and size), the color, the specific gravity, the kneading degree, etc. of the filling chip, is performed. The filler chips that do not meet the commercialization requirements in this step can be re-extruded by being transferred to the extruder. The filling chip that has passed through the sorting step S130 is wrapped using a wrapping paper (S150), and finally can be used for commercialization.

Hereinafter, the present invention will be described in detail with reference to exemplary embodiments, but the present invention is not limited to the following examples.

Example  1: for artificial turf Filling chip  Produce

Filling chips for artificial turf were prepared using the ingredients and mixing ratios shown in Table 1 below. After combining the ingredients listed in Table 1, the blend was extruded in a twin extruder for 90 minutes. The extrusion conditions are as follows. The effective length (L / D ratio) of the screw attached to the extruder was 25. The speed of the extruder was 200 rpm (500 kg / hr). The temperature of extruder was 190 ℃ for mixing zone, 210 ℃ for conveying zone and 250 ℃ for Dias adapter. Then, the extrudate was cut using a water-cooling cutting method to prepare pellet-shaped artificial turf filling chips. The temperature of the cooling water was 40 占 폚.

Filled Chip Components and Mixing Ratio for Artificial Turf ingredient Blending ratio (% by weight) Remarks Crystalline PLA 10 Amorphous PLA 25 Tributyl acetyl citrate 15 Plasticizer CaCO ₃ (surface treatment) 45 Inorganic filler Core / cell acrylate resin 5 Crystallization inhibitor Glycidyl methacrylate copolymer 0.2 parts by weight Chain extender Di (2,6-diisopropylphenyl) carbodiimide 0.5 parts by weight I turn off the moisture

Example  2: for artificial turf Filling chip  Produce

The procedures of Example 1 were repeated except that the ingredients and mixing ratios shown in Table 2 were used to prepare filled chips for artificial turf.

Filled Chip Components and Mixing Ratio for Artificial Turf ingredient Blending ratio (% by weight) Remarks Crystalline PLA 10 Amorphous PLA 25 Waste cooking oil 15 Plasticizer CaCO ₃ (surface treatment) 45 Inorganic filler Core / cell acrylate resin 5 Crystallization inhibitor Glycidyl methacrylate copolymer 0.2 parts by weight Chain extender Di (2,6-diisopropylphenyl) carbodiimide 0.5 parts by weight I turn off the moisture

Example  3: for artificial turf Filling chip  Produce

The procedures of Example 1 were repeated except that the ingredients and mixing ratios shown in Table 3 were used to prepare filled chips for artificial turf.

Filled Chip Components and Mixing Ratio for Artificial Turf ingredient Blending ratio (% by weight) Remarks Crystalline PLA 10 Amorphous PLA 25 Waste cooking oil 15 Plasticizer Al (OH) ₃ 45 Inorganic filler Core / cell acrylate resin 5 Crystallization inhibitor Glycidyl methacrylate copolymer 0.2 parts by weight Chain extender Di (2,6-diisopropylphenyl) carbodiimide 0.5 parts by weight I turn off the moisture

Example  4: For artificial turf Filling chip  Produce

The procedures of Example 1 were repeated except that the ingredients and mixing ratios shown in Table 4 were used to prepare filled chips for artificial turf.

Filled Chip Components and Mixing Ratio for Artificial Turf ingredient Blending ratio (% by weight) Remarks Crystalline PLA 10 Amorphous PLA 25 Epoxidized soybean oil 15 Plasticizer Al (OH) ₃ 45 Inorganic filler Core / cell acrylate resin 5 Crystallization inhibitor Glycidyl methacrylate copolymer 0.2 parts by weight Chain extender Di (2,6-diisopropylphenyl) carbodiimide 0.5 parts by weight I turn off the moisture

Experimental Example  : For artificial turf Of the filling chip  Property measurement

The specific gravity (KSM 0064 standard), the impact absorption rate (KS standard: 11 kg / m 2) and the X-ray fluorescence analysis (XF) of the filling chips for artificial turf manufactured in each of the above- -F) were used to analyze the contents of the four major metals (KS standard: 25 ppm or less). The results of the physical properties of the filling chips for artificial turf according to the present experimental example are shown in Table 5 below.

Measurement of physical properties of filling chips for artificial turf Example importance
(25 DEG C) Shock absorption rate
(11 kg / m 2 4 heavy metals content (ppm) Cr ^{6 +} Hg CD Pb One 1.42 51% - - - - 2 1.44 50% - - - - 3 1.37 53% - - - - 4 1.34 54% - - - -

The standards (KSM 0064 standard) required as filling chips for artificial turf are less than 1.5, but the filling chips for artificial turf manufactured in Examples 1-4 satisfied all of these criteria. According to the KS standard, the impact absorbing rate standard required for the artificial turf filler chip is more than 50% at 11 kg / m 2. Similarly, the artificial turf filler chips prepared in Examples 1-4 satisfied all of these criteria. In addition, in the case of the artificial grass filling chip manufactured in Example 1-4, no four heavy metal components were detected, which satisfies the KS standard of 25 ppm or less.

Although the present invention has been described based on the preferred embodiments of the present invention, the present invention is not limited to the embodiments described above. Those skilled in the art will appreciate that various modifications and changes may be made without departing from the scope of the present invention. It will be apparent, however, that such modifications and variations are all within the scope of the present invention, through the appended claims.

Claims (23)

35 to 70% by weight of an inorganic filler; 10 to 40% by weight of polylactic acid; 10 to 30% by weight of a plasticizer; 3 to 10% by weight of a crystallization inhibitor selected from acrylate resins; Chain extenders 0.1 to 5% by weight; And from 0.05 to 2% by weight of moisture release.
The method according to claim 1,
Wherein said polylactic acid is a mixture of crystalline polylactic acid and amorphous polylactic acid in a weight ratio of 1: 2 to 4.
The method according to claim 1,
Wherein the inorganic filler is at least one selected from the group consisting of calcium carbonate, talc, fused silica, magnesium bicarbonate, and aluminum hydroxide.
The filling chip for artificial grass according to claim 1, wherein the inorganic filler is surface-treated with a fatty acid, a fatty acid salt, a silane coupling agent, a titanium coupling agent, a zirconium coupling agent and an aluminum coupling agent.
5. The method of claim 4,
The silane coupling agent may be selected from the group consisting of 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxy- ) -Silane, 2- (acryloxyethoxy) trimethylsilane, N- (3-acryloxy-2-hydroxypropyl) -3-aminopropyltriethoxysilane, (3-acryloxypropyl) dimethylmethoxysilane (Trimethylsilyl) silane, (3-acryloxypropyl) methyldimethoxysilane, 3- (N-arylamino) propyltrimethoxysilane, aryldimethoxysilane, aryl (3-cyclohexenyl) ethyl] trimethoxysilane, 5- (bicycloheptenyl) tri (methoxycarbonyl) triethoxysilane, butenyl triethoxysilane, 2- Ethoxysilane, (3-cyclopentadienylpropyl) triethoxysilane, 1,1-diethoxy-1-silylacrylophen-3-ene, (per furyloxymethyl ) Triethoxysilane, O- (ethacryloyloxyethyl) -N- (triethoxysilylpropyl) urethane, N- (3-methacryloyl-2-hydroxypropyl) -3-aminopropyltriethoxy Silane, (methacryloyloxymethyl) bis (trimethylsiloxy) methylsilane, (methacryloyloxymethyl) dimethylethoxysilane, methacryloxymethyltriethoxysilane, methacryloxymethyltrimethoxysilane, 3-methacrylic Methacryloxypropyldimethylmethoxysilane, methacryloxypropylmethyldiethoxysilane, methacryloxypropylmethyldimethoxysilane, (3- (meth) acryloxypropylmethyldimethoxysilane, (meth) acryloxypropyldimethoxysilane, Methacryloxypropyltris (vinyldimethoxysilane) silane, 3- (N-styrylmethyl-2-aminoethylamino) silane, methacryloxypropyltris (methoxyethoxy) ) -Propyltrimethoxysil Aminopropyl trimethoxysilane, N-2- (aminoethyl) -3-aminopropyltrimethoxysilane, N-2- Methyldiethoxysilane, N-2- (aminoethyl) -3-aminopropyltriethoxysilane, 3-triethoxysilyl-N- (1,3-dimethyl- Aminopropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, N- (vinylbenzyl) -2-aminoethyl-3-aminopropyltrimethoxysilane hydrochloride, 3-ureidopropyltriethoxysilane, 3- , 3-glycidyloxypropyltrimethoxysilane, 3-glycidyloxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-mercapto Propyltriethoxysilane, 3-mercaptopropylmethyldimethoxysilane, bis (triethoxysilylpropyl) tetrasulfide, 3-isocyanatopropyltriethoxy Silane, 3-isocyanatopropyltrimethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, 3-aminopropylmethyldiethoxysilane and 2- (3,4-epoxycyclohexyl) -ethyltrimethoxysilane Can be selected. And is preferably selected from the group consisting of tetramethoxysilane, tetraethoxysilane, dimethoxyacrylosilane, diethoxyacrylosilane, dimethoxypropylaminosilane, diethoxypropylaminosilane, and combinations thereof,
The fatty acid may be selected from the group consisting of decanoic acid (capric acid), dodecanoic acid (lauric acid), tetradecanoic acid (myristic acid), hexanedecanoic acid (palmitic acid) , Octadecanoic acid (stearic acid), 9-octadecenoic acid (oleic acid), 9,12-octadecadienoic acid (linoleic acid), 9,12,15-octa (Linolenic acid), arachidic acid (eicosanoic acid), 5,8,11,14-eicosatetraenoic acid (arachinonic acid), 13-docoseno (Erucic acid), 7,10,13,16,19-docosapentaenoic acid, and the like;
Wherein the fatty acid salt comprises at least one fatty acid metal salt selected from the group consisting of zinc stearate, calcium stearate, sodium stearate, magnesium stearate, aluminum stearate, sodium oleate, zinc oleate and zinc palmitate.
The method according to claim 1,
Wherein the plasticizer is a vegetable plasticizer comprising a vegetable oil or a citrate salt substituted with alkyl having 1-10 carbon atoms.
The method according to claim 6,
Wherein the vegetable oil is at least one selected from the group consisting of soybean oil, castor oil, palm oil, coconut oil, corn oil, sunflower seed oil, waste cooking oil and epoxidized soybean oil.
The method according to claim 1,
Wherein the crystallization inhibitor is an acrylate-based polymer having a core / shell structure.
9. The method of claim 8,
The monomers constituting the core include 10-30% by weight of linear or branched alkyl-substituted acrylates having 1-7 carbon atoms, 10-80% by weight of methyl methacrylate and 10-60% by weight of styrene monomer Filling chip.
9. The method of claim 8,
The cell comprises 1 to 40% by weight of a first monomer selected from methacrylic acid, vinylimidazole, N-vinyl-2-methylimidazole and combinations thereof; And 60 to 99% by weight of a second monomer composed of an alkyl methacrylate having a straight-chain or branched alkyl group having 1 to 7 carbon atoms.
The filling chip for artificial turf according to claim 1, wherein the chain extender comprises a glycidyl acrylate-based or glycidyl methacrylate-based copolymer or a terpolymer.
12. The method of claim 11,
Wherein the chain extender is 10 to 60% by weight of glycidyl acrylate or glycidyl methacrylate; And 10 to 50% by weight of a monomer composed of alkyl methacrylate, alkyl acrylate, and styrene, or a terpolymer.
The method according to claim 1,
Wherein said moisture release comprises a carbodiimide compound.
14. The method of claim 13,
The moisture release is preferably carried out in the presence of at least one compound selected from the group consisting of di (2,6-diisopropylphenyl) carbodiimide, dicyclohexylcarbodiimide, diisopropylcarbodiimide, poly-2,4,6-isopropylcarbodiimide, A filling chip for artificial turf selected from the group consisting of a combination.
Wherein the polyolefin resin composition comprises 35 to 70 wt% of inorganic filler, 10 to 40 wt% of polylactic acid, 10 to 30 wt% of plasticizer, 3 to 10 wt% of crystallization inhibitor selected from acrylate resin, 0.1 to 5 wt% 0.05 to 2% by weight of release;
Extruding the compound obtained in the compounding step; And
Cutting the extruded formulation to form a filler chip in the form of a pellet
Wherein the method comprises the steps of:
16. The method of claim 15,
Wherein the step of forming the pellet-shaped filling chip comprises cutting the extruded compound by a water-cooling cutting or a hot-cutting method.
16. The method of claim 15,
Wherein said polylactic acid is a mixture of crystalline polylactic acid and amorphous polylactic acid in a weight ratio of 1: 2 to 4.
16. The method of claim 15,
Wherein the inorganic filler is surface-treated with a fatty acid, a fatty acid salt, a silane coupling agent, a titanium-based coupling agent, a zirconium-based coupling agent and an aluminum-based coupling agent before the mixing step Gt;
16. The method of claim 15,
Wherein the inorganic filler is at least one selected from the group consisting of calcium carbonate, talc, fused silica, magnesium bicarbonate, and aluminum hydroxide.
16. The method of claim 15,
Wherein the plasticizer is a vegetable plasticizer containing a vegetable oil or a citrate salt substituted with alkyl having 1-10 carbon atoms.
16. The method of claim 15,
Wherein the crystallization inhibitor is an acrylate-based copolymer having a core / shell structure.
16. The method of claim 15,
Wherein the chain extender is a glycidyl acrylate-based or glycidyl methacrylate-based copolymer or a terpolymer.
16. The method of claim 15,
Wherein the moisture release comprises a carbodiimide compound.

Images