KR102242025B1 - Artificial turf filler for burn prevention and its manufacturing method - Google Patents

Abstract

An artificial turf filler for burn prevention according to an embodiment of the present invention includes 10 to 40 wt% of a styrenic polymer, 10 to 40 wt% of a polyethylene resin, 1 to 40 wt% of an inorganic filler, 1 to 10 wt% of an additive for burn prevention, and 5 to 10 wt% of a functional additive. The artificial turf filler for burn prevention does not generate harmful substances such as heavy metals.

Description

Artificial turf filler for burn prevention and its manufacturing method}

The present invention relates to an artificial turf filler for preventing burns and a method of manufacturing the same.

Recently, as outdoor activities for infants and children are encouraged, cases of installing artificial turf in schools or apartment complexes are increasing. The general artificial turf installation method is as follows. After laying artificial turf on ready-mixed concrete or rubble compaction, the artificial turf is fixed by pouring silica sand between the artificial turf. Thereafter, a filling layer is formed with an elastic filler on the silica sand, and a part of the artificial turf pile is covered with the filler.

In general, rubber chips are used as the elastic filler. The rubber chips are pulverized by sunlight or the like to generate crushed powder. The crushed powder is accumulated on the floor and is blown around, breathing into the bronchial tubes of infants and children, thereby damaging health. In addition, since the rubber chips not only generate a lot of frictional heat, but also have a small moisture content, when a user slides or slides during a game, the risk of burns due to instantaneous frictional heat is very high.

Registered Patent No. 10-1674905 (announced on November 10, 2016)

The present invention has been conceived to solve the problems of the prior art described above, and is to provide a new image-preventing artificial turf filler having excellent durability and anti-burn properties, and a method of manufacturing the same.

The artificial turf filler for preventing burns according to an embodiment of the present invention includes 10 to 40% by weight of a styrene-based polymer, 10 to 40% by weight of a polyethylene resin, 1 to 40% by weight of an inorganic filler, and 1 to 10% by weight of an additive for preventing burns. % And 5 to 10% by weight of functional additives.

The artificial turf filler may further include 1 to 5% by weight of a silicone-based compound.

The styrene-based polymer is styrene-ethylene-butadiene-styrene copolymer (SEBS), styrene-butadiene-styrene copolymer (SBS), styrene-ethylene-propylene-styrene copolymer (SEPS), hydrogenated styrene-isoprene-butadiene copolymer. It may be at least one selected from the group consisting of (SEEPS) and styrene-isoprene-styrene copolymer (SIS).

The polyethylene resin may be at least one selected from the group consisting of Linear Low Density Polyethylene, Low Density Polyethylene, Medium Density Polyethylene, and High Density Polyethylene. .

The polyethylene resin may include a long chain branch, and a long chain branching index may range from 0.23 to 0.55.

The inorganic filler may be at least one selected from the group consisting of calcium carbonate, activated carbon, and mica.

The additives for preventing burns include paraffin wax, oxidized paraffin wax, stearic acid, cetyl alcohol, stearyl alcohol, and glycerol mono stearate. ), glycerol mono oleate, stearyl stearate, calcium stearate, magnesium stearate, zinc stearate, erucamide and ole It may be one or more selected from the group consisting of amide (Oleamide).

The additive for preventing burns may be calcium stearate and paraffin wax.

The functional additive may be at least one selected from the group consisting of a color master batch, an anti-aging agent, an antioxidant, and a flame retardant.

Skin friction characteristics of the artificial turf filler according to the following measurement method may be 0.35 to 0.9, and the measurement method is KS F3888-1.

A method of manufacturing an artificial turf filler for preventing burns according to another embodiment of the present invention includes 10 to 40% by weight of a styrene-based polymer, 10 to 40% by weight of a polyethylene resin, 1 to 40% by weight of an inorganic filler, and 1 to 40% by weight of an inorganic filler. Injecting ~10% by weight and 5-10% by weight of a functional additive into a mixer, dispersing it, and interlocking it with an extruder to prepare a strand-shaped filler; And cutting the prepared strand-shaped filler in water into a predetermined shape to prepare a granular filler.

The artificial turf filler for preventing burns of the present invention contains styrene-based polymer, polyethylene resin, inorganic filler, burn-preventing additive and functional additive in a specific amount, so that harmful substances such as heavy metals are not generated, and has excellent durability and anti-burn properties. There is an advantage.

Hereinafter, a preferred embodiment of the present invention will be described in detail. In describing the present invention, when it is determined that a detailed description of a related known technology may obscure the subject matter of the present invention, a detailed description thereof will be omitted. Throughout the specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated.

The present inventors have repeatedly researched to develop an artificial turf filler for preventing burns that can replace rubber chips, does not generate harmful substances such as heavy metals, has excellent durability, and has excellent burn-preventing properties. (Polyethylene) resin, inorganic fillers, burn prevention additives and functional additives were found in certain contents to prevent harmful substances such as heavy metals from being generated, and to provide an artificial turf filler with excellent durability and burn prevention properties. Led to the invention.

The "strand shape" described in the present invention means a shape that is elongated with a certain diameter.

The artificial turf filler for preventing burns according to an embodiment of the present invention includes 10 to 40% by weight of a styrene-based polymer, 10 to 40% by weight of a polyethylene resin, 1 to 40% by weight of an inorganic filler, and 1 to 10% by weight of an additive for preventing burns. % And 5 to 10% by weight of functional additives.

In addition, the artificial turf filler for preventing burns of the present invention may further contain 1 to 5% by weight of a silicone-based compound.

The silicone-based compound may be at least one selected from the group consisting of polydimethylsiloxane, polymethylalkylsiloxane, polydimethylsiloxane containing a hydroxyl group, and siloxane, and preferably polydimethylsiloxane (PDMS).

Since the silicone-based compound does not have a reactive functional group, it can impart stability and lubricity of the surface of the filler, prevent the burn-preventing additive from escaping from the surface of the filler, and lower the coefficient of friction to further maximize the anti-burn properties. I can.

The viscosity of the silicone-based compound may be 50 to 5,000 cst, preferably 100 to 1,000 cst. If the viscosity of the silicone-based compound is less than 50 cst, there is a problem that the durability of the filler is deteriorated, and when the viscosity exceeds 5,000 cst, the viscosity is too high and industrial workability may be lowered, resulting in a decrease in the quality of the filler, so the above range is preferable. Do.

The viscosity of the silicone-based compound can be measured using a Canon-Fenske Type Viscometer, etc. as a dynamic viscosity measurement method, and the silicone-based compound has a specific gravity of 0.950 to 1.000 at room temperature (25 °C). Can be

The content of the silicone-based compound may include 1 to 5% by weight, and preferably 2 to 3% by weight, based on 100% by weight of the filler. If the content of the silicone-based compound is less than 1% by weight, there is a problem in the performance of reducing the coefficient of friction, and if it exceeds 5% by weight, there is a problem that mixing with the main raw material is not completely performed, and the above range is preferable.

In addition, when the silicone-based compound, that is, PDMS, is added to the image-preventing filler of the present invention, there is an effect that the image-preventing additive contained in the filler is exposed to the surface, so that the image-preventing effect can be further improved.

In the present invention, the styrenic polymer may impart elasticity and elastic recovery power to the filler.

Therefore, the artificial turf filler for preventing burns of the present invention functions as an elastomer.

In addition, the styrene-based polymer is styrene-ethylene-butadiene-styrene copolymer (SEBS), styrene-butadiene-styrene copolymer (SBS), styrene-ethylene-propylene-styrene copolymer (SEPS), hydrogenated styrene-isoprene-butadiene. It may be at least one selected from the group consisting of a copolymer (SEEPS) and a styrene-isoprene-styrene copolymer (SIS), and specifically, may be a styrene-ethylene-butadiene-styrene copolymer (SEBS).

The styrene-ethylene-butadiene-styrene (SEBS) is a material that can realize physical properties most similar to natural rubber.

Specifically, the styrene-ethylene-butadiene-styrene (SEBS) imparts elasticity and elastic resilience, and because it is itself a block structure, it serves to prevent crosslinking formation during compounding (compounding). The styrene-ethylene-butadiene-styrene (SEBS) is a three-dimensional structure consisting of a styrene hard segment at both ends and an ethylene-butadiene soft segment connected between the heavy segments. The styrene-ethylene-butadiene-styrene (SEBS) has a two-phase structure in which a hard segment and a soft segment are phase-separated. Styrene hard segment is a crystalline region that is not mixed with ethylene-butadiene soft segment, which is an amorphous region, forms a physical crosslink at room temperature, gives mechanical properties (e.g., tensile strength), and has a glass transition temperature (Tg) of about 100 ℃. The ethylene-butadiene soft segment is a hydrophobic amorphous region that absorbs the process oil and has a glass transition temperature (Tg) of about -55°C. The phase separation between the styrene hard segment and the ethylene-butadiene soft segment is due to different solubility parameters (styrene-9.1, ethylene-butadiene -7.76), and the degree of phase separation affects mechanical properties, rheological properties, and heat resistance, so the degree of phase separation is large. It is advantageous.

The content of the styrene-based polymer may include 10 to 40% by weight, preferably 20 to 30% by weight based on 100% by weight of the filler. If the content of the styrenic polymer is less than 10% by weight, elasticity, abrasion resistance, durability, etc. may be deteriorated, and if it exceeds 40% by weight, the improvement in performance compared to the amount of input is insignificant, and the above range is preferable.

The polyethylene resin is a chain-shaped hydrocarbon compound having one double bond and is a polymer compound synthesized by olefin polymerization. In the present invention, the polyethylene resin functions as a curable polymer that determines the hardness of the filler. The polyethylene resin applied to the present invention is one of the curable polymers that determine the hardness, and is used to impart light resistance, fluidity, surface resistance, and mechanical properties to the filler.

The polyethylene resin is at least one resin selected from the group consisting of Linear Low Density Polyethylene, Low Density Polyethylene, Medium Density Polyethylene, and High Density Polyethylene. Can be

In addition, the polyethylene resin includes a long chain branch, and by adding polyethylene including a long chain branch to the filler, durability of the filler may be improved.

The polyethylene resin including the long-chain branch may be synthesized using a Ziegler-Natta catalyst or a metallocene catalyst, and preferably may be prepared using a metallocene catalyst.

Polyethylene (including long chain branches) synthesized using the metallocene catalyst can achieve a more uniform synthesis than polyethylene (including long chain branches) prepared using Ziegler-Natta catalyst, which is Physical and chemical properties can be further improved.

The polyethylene resin including the long-chain branch, that is, the branched polyethylene resin, has a narrow molecular weight distribution compared to the general polyethylene resin, and the surface of the filler is modified to improve wear resistance.

The polyethylene resin including the long chain branching may have a long chain branching index in the range of 0.23 to 0.55. If it is out of the above range, the effect of improving abrasion resistance and durability may be deteriorated.

The polyethylene resin may have a density of 0.930 to 0.940 g/cm 3 and a melt index (MI) of 0.1 to 5 g/10min. In addition, in order to satisfy the artificial turf system quality standard of A-1 grade according to the artificial turf KS M 3888-1:2013 system quality standard, the content of the polyethylene resin is 10 to 40% by weight based on 100% by weight of the filler. It may include, preferably 15 to 25% by weight. If the content of the polyethylene resin is less than 10% by weight, there is a problem that mixing with the inorganic filler may be deteriorated, and if it exceeds 40% by weight, the softness cannot be imparted to the filler and it becomes hard, resulting in a problem that the shock absorption property is lowered. In this case, the above range is preferable.

The inorganic filler is added to impart dimensional stability and appropriate hardness of the filler, and may be at least one selected from the group consisting of calcium carbonate, activated carbon, and mica.

The content of the inorganic filler may include 1 to 40% by weight, and preferably 10 to 30% by weight, based on 100% by weight of the filler. When the content of the inorganic filler is less than 1% by weight, physical properties such as dimensional stability may be deteriorated, and when it exceeds 40% by weight, it is difficult to implement the desired performance as inorganic materials such as abrasion resistance, durability, and elasticity.

The additives for preventing burns include paraffin wax, oxidized paraffin wax, stearic acid, cetyl alcohol, stearyl alcohol, and glycerol mono stearate. ), glycerol mono oleate, stearyl stearate, calcium stearate, magnesium stearate, zinc stearate, erucamide and ole It may be one or more selected from the group consisting of amide (Oleamide), preferably calcium stearate and paraffin wax.

The burn-preventing additive imparts releasability between the metal surfaces of the compressor to improve flowability in the manufacture of the burn-preventing filler, and penetrates into the molecules of the filler or the molecules of the polyethylene and causes the chains to slide with each other. By causing flow, it can exhibit anti-burn properties.

In addition, the anti-image additive is uniformly coated on the surface of the filler to reduce friction.

Although described above, once again, when a filler is prepared by mixing the image-preventing additive and PDMS, the image-preventing additive is exposed to the surface of the filler, and thus the image-preventing properties can be further improved.

The content of the anti-burn additive may include 1 to 10% by weight based on 100% by weight of the filler, and preferably 3 to 5% by weight, and if the content is less than 1% by weight, the surface friction coefficient Since the deterioration is insufficient, the burn prevention effect may be insignificant. If the amount exceeds 10% by weight, the polyethylene and the additives are not properly mixed, and there is a problem that dimensional stability is deteriorated, and the above range is preferable.

In the present invention, the functional additive may be at least one selected from the group consisting of a color master batch, an anti-aging agent, an antioxidant, and a flame retardant.

The color master batch, anti-aging agent, antioxidant, and flame retardant may be mixed and used in a 1:1:1:1 weight ratio, and the mixed functional additive may be included in an amount of 5 to 10% by weight based on 100% by weight of the total.

The color master arrangement, anti-aging agent, antioxidant, and flame retardant are commonly used, and a description thereof will be omitted.

Skin friction characteristics according to the following measurement method of the artificial turf filler according to an embodiment of the present invention may range from 0.35 to 0.9, and the measurement method is KS F3888-1.

A method of manufacturing an artificial turf filler for preventing burns according to another embodiment of the present invention includes 10 to 40% by weight of a styrene-based polymer, 10 to 40% by weight of a polyethylene resin, 1 to 40% by weight of an inorganic filler, and 1 to 40% by weight of an inorganic filler. Injecting ~10% by weight and 5-10% by weight of a functional additive into a mixer, dispersing it, and interlocking it with an extruder to prepare a strand-shaped filler; And cutting the prepared strand-shaped filler in water into a predetermined shape to produce a granular filler.

In the case of using calcium stearate and paraffin wax as additives for preventing burns in the manufacture of the artificial turf filler for preventing burns, it is preferable to first add calcium stearate and then add paraffin wax.

The properties of both lubricants can be maximized by first adding calcium stearate, an internal lubricant, to melt it, and then adding paraffin wax, an external lubricant.

Hereinafter, the present invention will be described in more detail by examples. However, the following examples are merely illustrative of the present invention, and the contents of the present invention are not limited to the following examples.

Example 1

First, 200 g of linear low-density polyethylene having a long chain branching index of 0.3 was prepared.

Next, the prepared linear low density polyethylene 250g, styrene-ethylene-butadiene-styrene copolymer 300g, calcium carbonate 300g, calcium stearate 50g, green master batch 25g, antioxidant 25g, antioxidant 25g, and flame retardant 25g were mixed for 10 minutes. It was extruded at a temperature of 220° C. using an extruder to form a sheet and cooled in water to prepare a sheet-shaped filler sample for artificial turf.

Example 2

It was carried out in the same manner as in Example 1, but by adding 100 g of PDMS, a silicon-based compound, to prepare a sheet-type filler specimen for artificial turf.

Example 3

In the same manner as in Example 1, a sheet-shaped artificial turf filler specimen was prepared using 50 g of paraffin wax instead of 50 g of calcium stearate.

Example 4

In the same manner as in Example 2, a sheet-shaped artificial turf filler specimen was prepared using 25 g of calcium stearate and 50 g of paraffin wax instead of 50 g of calcium stearate.

Here, the paraffin wax is a linear low-density polyethylene, styrene-ethylene-butadiene-styrene copolymer, calcium carbonate, calcium stearate, green master batch, anti-aging agent, antioxidant, and flame retardant are mixed and melted and added at the end to fill artificial turf. Was prepared.

Comparative Example 1

A commercially available SEBS artificial turf filler was melted to prepare a sheet-shaped specimen.

Comparative Example 2

A commercially available EPDM artificial turf filler was melted to prepare a sheet-shaped specimen.

Experimental Example 1: Burn Prevention Characteristics

After leaving Examples 1 to 4 and Comparative Examples 1 and 2 in an environment of 22°C/50% for 24 hours, the friction coefficient of the specimen prepared according to the ASTM D 1894 method was measured, and the results are shown in Table 1 below.

Item Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Coefficient of friction (COF) 0.21 0.61 0.15 0.13 0.45 0.52

As can be seen in Table 1 above, in the case of Comparative Example 1 and Comparative Example 2, the antistatic friction coefficient was measured high, in the case of Examples 1 to 4, the surface friction coefficient was measured low, and in particular, in the case of Example 4, the surface friction It can be seen that the characteristics are the best.

Experimental Example 2: Measurement of wear resistance properties

Examples 1 to 4 and Comparative Examples 1 and 2 were left at 22°C/50% condition for 24 hours, and then the weight loss rate before and after 2,000 cycles was measured using a Taber abrasion (H18) machine and shown in [Table 2].

division Wear-resistance reduction rate (%) Example 1 10 Example 2 9 Example 3 10 Example 4 8 Comparative Example 1 14 Comparative Example 2 13

As can be seen in Table 2 above, Examples 1 to 4 were all confirmed to be superior to the product of Comparative Example, and Example 4 showed the best results.

The artificial turf filler for burn prevention of the present invention contains styrene-based polymer, polyethylene resin, inorganic filler, burn-preventing additive and functional additive in a specific amount, so that harmful substances such as heavy metals are not generated, and has excellent durability and anti-burn properties. There is an advantage.

The preferred embodiments of the present invention have been described in detail above. The description of the present invention is for illustrative purposes only, and those of ordinary skill in the art to which the present invention pertains will be able to understand that other specific forms can be easily modified without changing the technical spirit or essential features of the present invention.

Therefore, the scope of the present invention is indicated by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning, scope and equivalent concepts of the claims are included in the scope of the present invention. It must be interpreted.

Claims (11)

Including 10 to 40% by weight of a styrene polymer, 10 to 40% by weight of a polyethylene resin, 1 to 40% by weight of an inorganic filler, 1 to 10% by weight of an additive for preventing burns, and 5 to 10% by weight of a functional additive,
The polyethylene resin includes a long chain branch, and has a long chain branching index in the range of 0.23 to 0.55,
The additive for preventing burns is calcium stearate and paraffin wax, and is prepared by adding the calcium stearate and then adding paraffin wax.
Artificial turf filler for burn prevention. The method of claim 1,
The artificial turf filler,
Characterized in that it further comprises 1 to 5% by weight of the silicone-based compound,
Artificial turf filler for burn prevention. The method of claim 1,
The styrene-based polymer is styrene-ethylene-butadiene-styrene copolymer (SEBS), styrene-butadiene-styrene copolymer (SBS), styrene-ethylene-propylene-styrene copolymer (SEPS), hydrogenated styrene-isoprene-butadiene copolymer. (SEEPS) and styrene-isoprene-styrene copolymer (SIS), characterized in that at least one selected from the group consisting of,
Artificial turf filler for burn prevention. The method of claim 1,
The polyethylene resin,
Characterized in that at least one selected from the group consisting of Linear Low Density Polyethylene, Low Density Polyethylene, Medium Density Polyethylene, and High Density Polyethylene,
Artificial turf filler for burn prevention. delete The method of claim 1,
The inorganic filler, characterized in that at least one selected from the group consisting of calcium carbonate, activated carbon and mica,
Artificial turf filler for burn prevention. delete delete The method of claim 1,
The functional additive,
Characterized in that at least one selected from the group consisting of color master arrangement, anti-aging agent, antioxidant and flame retardant,
Artificial turf filler for burn prevention. The method of claim 1,
The artificial turf filler has a skin friction characteristic of 0.35 to 0.9 according to the following measurement method,
Artificial turf filler for burn prevention.
[How to measure]
KS F3888-1 Add 10 to 40% by weight of styrene polymer, 10 to 40% by weight of polyethylene resin, 1 to 40% by weight of inorganic filler, 1 to 10% by weight of anti-burn additive and 5 to 10% by weight of functional additive to the mixer and disperse And then interlocking with an extruder to prepare a strand-shaped filler; And
Including the step of manufacturing a granular filler by cutting the prepared strand-shaped filler in water in a predetermined shape,
The polyethylene resin includes a long chain branch, and has a long chain branching index in the range of 0.23 to 0.55,
The burn-preventing additive is calcium stearate and paraffin wax, characterized in that prepared by adding the calcium stearate and then paraffin wax,
Manufacturing method of artificial turf filler for preventing burns.