WO2018021659A1

WO2018021659A1 - Elastic chip for filling artificial turf and paving ground

Info

Publication number: WO2018021659A1
Application number: PCT/KR2017/004193
Authority: WO
Inventors: 이성율
Original assignee: 화인케미칼 주식회사
Priority date: 2016-07-28
Filing date: 2017-04-19
Publication date: 2018-02-01
Also published as: KR101723817B1

Abstract

Provided is an elastic chip for filling artificial turf and paving the ground. The elastic chip comprises a rubber-based polymer material and has a rod-shaped structure of which both end surfaces are flat and the longitudinal length is longer than at least the cross-sectional diameter thereof, wherein the length of the elastic chip is 2 to 20 times that of the cross-sectional diameter.

Description

Elastic chip for artificial turf filling and ground packing

The technology disclosed in the present specification relates to an elastic chip for artificial turf filling and ground pavement, and to provide an elastic chip for artificial turf filling and ground pavement having low slipperiness and excellent permeability.

In order to reduce the impact on the joints during exercise and to prevent falls of the elderly and infants, a lot of elastic packaging materials are installed in pedestrian tracks or park kindergartens. This elastic packaging material was originally installed on the concrete floor by mixing rubber powder and polyurethane binder obtained by crushing waste tires.The color was dark and recently, it was mixed with EPDM rubber, crosslinked with pulverized powder, Polyurethane binder is mixed and laid on the concrete floor, and beautiful elastic packing materials of various colors are used. However, such an elastic packaging material has no problem in the dryer, but the lack of permeability during the rainy season, the water does not fall well after the rain stops, and the water introduced into the voids in the elastic packaging material is not dried well, and the polyurethane used as a binder is hydrolyzed. As the strength of the pavement material is weak and the adhesion to concrete, which is the floor surface, is poor, the pavement material is frequently separated from the floor surface.

Artificial turf, used for football or football, places an infill between the pile for the purpose of the pile upright and the elasticity of the artificial turf. When the filler layer has a two-layer structure, a layer of sand or silica sand having a diameter of 0.5-1.5 mm is usually disposed in the lower layer, and waste tire grinding chips or EPDM rubber grinding chips, such as those used for the elastic packaging material, are disposed on the upper layer. Or the chip | tip cut out by extruding thermoplastic rubber | gum, such as SEBS, is arrange | positioned. By doing so, the pile is upright and elastic, thereby realizing the functionality of the artificial turf as natural grass. However, since waste tire chips or EPDM chips are mechanically crushed, they have an unspecified shape of 4 mm or less in size, and there may be a lot of lint on the edges of the crushed material, so there are very few voids when installing them as fillers. On the other hand, thermoplastic rubber extruded products such as SEBS are almost spherical or close to cylindrical, so the air gap is larger than that of tire chips or EPDM chips, but not enough. It is easily pushed in the opposite direction, the driving force is reduced, there is a problem that the performance is reduced. In addition, in case of sudden heavy rain, the gaps between the chips are not enough, and the chips are swept away by the waves and the functions of the artificial grass have to be lost and the chips have to be re-packed.

According to an aspect of the invention, the artificial turf filling and ground pavement elastic chip, the elastic chip comprises a rubber-based polymer material, at least in the form of a rod-like structure having a length in the longitudinal direction longer than the cross-sectional diameter In addition, the elastic chip is provided for the artificial turf filling and ground packaging elastic chip having a length of 2 to 20 times the cross-sectional diameter.

According to another aspect of the invention, preparing an elastic filler composition;

Injecting the composition into an extruder; And cutting the polymer melt processed by the extruder to obtain an elastic chip, wherein the cutting of the polymer melt is performed such that the length / diameter ratio of the elastic chip is 2 to 20 times. And it provides a method of manufacturing the elastic chip for ground packaging.

According to another aspect of the present invention, a backing; A grass pile extending upward from the bubble; An inorganic filler layer comprising sand or silica sand filled on the bubble such that the grass pile is partially submerged; And artificial turf including the elastic filler layer including the above-mentioned elastic chip disposed on the inorganic filler layer is provided.

1 shows elastic chips according to an embodiment of the present invention.

2 shows examples of elastic chips having various cross-sectional shapes.

3 is a schematic diagram showing the structure of a crisscross-shaped elastic chip according to an embodiment of the present invention.

Figure 4 is a schematic diagram showing the structure of the bent elastic chip according to an embodiment of the present invention.

Figure 5 shows an example installed on the artificial turf using an elastic chip according to an embodiment of the present invention.

Injecting into the machine, and cutting the extruded polymer melt processed by the extruder. After the elastomer composition forms the polymer melt in the extruder and is extruded through a die plate of about 0.8 to 10 mm in diameter, the extruded melt is cut by underwater cutting, hot plate pelletizing, and strand cutting.

The elastic chip produced through such an extrusion process has a regular regular shape and may have a cylindrical or spherical shape. However, when the elastic chip has a cylindrical shape or a spherical shape, when the elastic chip is used as an artificial turf filler, the apparent density is increased (ie, the porosity is lowered) and at the same time, the slipperiness is increased due to its own shape, which may be inappropriate for use.

Method for producing an elastic chip according to an embodiment of the present invention is characterized in that for cutting the length of the extrudate in the cutting process. The cutting includes cutting so that the length / diameter ratio of the elastic chip is, for example, 2 to 20 times. Therefore, the elastic chip according to an embodiment of the present invention has a rod-like shape, and is characterized in that the length L is structured to have a long shape compared to the diameter D of the cross section. Here, when the cross section is a shape other than a circle, the diameter D is based on the longest diameter in the cross section. 1 shows elastic chips according to an embodiment of the present invention.

When the elastic chip with long length is used for ground pavement or artificial turf filling, there is less squeeze during movement on the ground or artificial turf. There are many voids between them to prevent loss due to heavy rain.

The length of the elastic chip is preferably 2 to 20 times, or 2.5 to 20 times, or 2.5 to 15 times, or 3 to 20 times, or 3 to 15 times, or 3 to 10 times, or 4 to 20 times the diameter. 20 times, or 4 to 15 times, or 4 to 10 times. When the length (L) / diameter (D) ratio is less than the above range, the effect of increasing the slipperiness or increasing the voids is reduced, and if the length (L) / diameter (D) ratio is exceeded, the chip may bend too much during cutting through extrusion cutting, after extrusion When transferring to the dehydrator, chips may be entangled and difficult to transfer, and when laying artificial turf, it may be difficult to entangle the laying machine.

The elastic chip may have a polygonal shape such as a circle, an ellipse, a triangle, a rectangle, a polygonal cross, a triangular pyramid, a star, or a polygonal pyramid. The shape of the cross section can be determined by the shape of the die exit of the extruder. 2 shows examples of elastic chips having various cross-sectional shapes.

In order to increase the porosity, the elastic chip preferably protrudes vertically in the longitudinal direction, and may have a wing portion extending in the longitudinal direction from one end to the other end.

3 is a schematic diagram showing the structure of a crisscross-shaped elastic chip according to an embodiment of the present invention. Referring to FIG. 3, since the space 130 is formed between the body 110 and the space due to the presence of the wing 120, permeability may be improved by installing such elastic chips. The shape of the wing is protruded with respect to the central axis of the body portion 110 in the longitudinal direction of the rod-shaped elastic chip as long as the shape that can be processed by extrusion, such as triangular pyramid shape, star shape, etc. on the basis of the cross section can be variously designed. Can be.

In particular, the elastic chip according to an embodiment of the present invention may have a rod-shaped bent elastic chip itself while producing a long rod-like structure in the process of being manufactured by extrusion after cutting. The use of curved rod-shaped elastic chips can further increase the porosity, and in addition to the elasticity of the material itself, the bent shape itself contributes to the improvement of elasticity like a spring, and thus has the advantage of obtaining a high elastic effect even with a small amount of elastic chips. .

The shape of the curved rods and straight rods can be determined by the process of cutting after extrusion. For example, when the cutting method is a strand cutting, the strand extruded and discharged through a die is cooled by a cooling tank and then cut by a cutting machine to obtain a straight rod-shaped elastic chip. In the case of underwater cutting, the rotary knife rotates and cuts as soon as it is discharged through the die of the extruder, thereby controlling the temperature of the extruder cylinder and die, the extrusion speed, and the rotating speed of the rotary knife to control the degree of bending of the bent bar. Can be.

Figure 4 is a schematic diagram showing the structure of the bent elastic chip according to an embodiment of the present invention. Referring to FIG. 4, when the center point of the entire length of the elastic chip is referred to as M and the cross-section center points at both ends are A1 and A2, the angle θ between the line segment MA1 and the line segment MA2 may be 90 to 180 degrees. . An angle θ of 180 degrees means a perfect straight line, and the angle becomes smaller depending on the degree of bending. In the case of the curved bar, the angle may be 90 to 179 degrees, preferably 90 to 175 degrees, more preferably 135 to 170 degrees. If it is less than the above range it may be difficult to lay installation due to the entanglement between the chips and the air gap is so large that the soccer shoes spike of the players may fall into the elastic chip. On the other hand, in the above range, the improved effect may be insignificant compared to the straight type.

When the elastic chip is manufactured by the same cutting method using the same elastic composition, the angle may generally decrease as the length / diameter ratio of the elastic chip increases. That is, as the length / diameter ratio of the elastic chip increases, the degree of bending of the elastic chip may increase. In particular, when the length / diameter ratio of the elastic chip is 3 or more, 4 or more, 5 or more or 10 or more, the angle is difficult to form a perfect straight line and the angle θ may be 90 to 179 degrees.

On the other hand, the angle can be adjusted by adjusting the hardness of the elastomer composition. That is, when the hardness increases at the same length / diameter ratio, the degree of bending of the elastic chip may be reduced.

In some embodiments, it may be constructed in a mixture of straight elastic chips and bent elastic chips. In some cases, when only the elastic chip is bent, the air gap becomes too large to endure the weight of the athletes, and the spikes of the soccer shoes can be buried, which may cause the movement to be improperly mixed. To this end, for example, a ratio of a straight elastic chip (θ = 180 degrees) and a curved type elastic chip (θ = 90 to 179 degrees) may be used by mixing 20 to 80 parts by weight or 50 to 50 parts by weight, respectively.

In one embodiment, the above-described elastic chip may be used as the artificial turf filler. In this case, the drainage function is improved, the filling material is not pushed back when the soccer player is fired, and the cost can be reduced. That is, according to one embodiment of the present invention, an artificial turf provided with the above-mentioned elastic chip is provided. Figure 5 shows an example installed on the artificial turf using an elastic chip according to an embodiment of the present invention. Referring to FIG. 5, the artificial turf is filled on the bubble 510 such that the grass pile 520 and the grass pile 520 extending upwardly from the backing 510 and the bubble 510 are partially locked. The inorganic filler layer 530 including sand or silica sand and the elastic filler 540 layer including the aforementioned elastic chip 542 disposed on the inorganic filler layer 530.

As described above, the elastic chip 542 has a long structure compared to the diameter, and thus, a large amount of voids 544 may be generated when the elastic chip 542 is laid on the artificial turf.

Meanwhile, in another embodiment, the above-described elastic chip may be mixed with the polyurethane binder for ground pavement and installed on concrete. In this case, the voids are more than doubled compared to the existing method, so that the drainage function is improved and the packaging material of a certain thickness can be obtained with a small weight, thereby reducing the cost.

In the present specification, the porosity after installing the above-mentioned elastic chip will be defined as follows.

Porosity (%) = (1-Weight equivalent to 1L volume of elastic chip (kg / L)) × 100 (%)

It is preferable that a porosity is 40 to 70% or less here. If the porosity is less than the above range, the permeability may be low. If the porosity is more than the above range, spikes of soccer players may fall out and cause a movement disorder.

Hereinafter, the present invention will be described in more detail with reference to various examples, but the technical spirit of the present invention is not influenced by the following examples.

Comparative Example 1

EPDM chip: 100 parts by weight of EPDM 330 (manufactured by Kumho Polychem), 1.0 part by weight of stearic acid, 2.0 parts by weight of dicumyl peroxide (DCP), and 27 parts by weight of calcium carbonate were mixed to form a flat sheet having a specific gravity of 1.0. . The sheet was put into a grinder and pulverized, and then beaten with a 2 mm and 4 mm scale sieve to obtain an elastic chip having a size of 2-4 mm.

Comparative Example 2

SEBS cylindrical chip: 100 parts by weight of SEBS H1052 (manufactured by Asahi Kasei) and 10 parts by weight of calcium carbonate were mixed, extruded by an extruder, and cut by underwater cutting to obtain a spherical elastic chip having a diameter of 3 mm. Specific gravity was 1.0.

Comparative Example 3

EPDM-PP Chip-1: 70 parts by weight of EPDM 330 (Kumho Polychem), 30 parts by weight of PP4017 (Korean emulsifier) and 26 parts by weight of calcium carbonate were mixed, extruded by an extruder and cut by strand cutting to cut 3 mm in diameter and 4.5 mm in length. The elastic chip of was obtained. Specific gravity was 1.0.

Example 1

EPDM-PP Chip-2: 70 parts by weight of EPDM 330 (manufactured by Kumho Polychem), 30 parts by weight of PP4017 (Korean emulsifier), 26 parts by weight of calcium carbonate were mixed, extruded by an extruder, and cut by strand cutting to obtain a diameter of 3 mm, a length of 15 mm, and An elastic chip having an angle of 180 degrees was obtained. Specific gravity was 1.0.

Example 2

EPDM-PP Chip-2: 70 parts by weight of EPDM 330 (manufactured by Kumho Polychem), 30 parts by weight of PP4017 (Korean emulsifier), 26 parts by weight of calcium carbonate were mixed, extruded by an extruder, and cut by strand cutting to obtain a diameter of 3 mm, a length of 30 mm, and An elastic chip having an angle of 180 degrees was obtained. Specific gravity was 1.0.

Comparative Example 4

EPDM-PP Chip-2: 70 parts by weight of EPDM 330 (manufactured by Kumho Polychem), 30 parts by weight of PP4017 (Korean emulsifier), 26 parts by weight of calcium carbonate were mixed, extruded by an extruder, and cut by strand cutting to obtain a diameter of 3 mm, a length of 70 mm, and An elastic chip having an angle of 180 degrees was obtained. Specific gravity was 1.0.

Example 3

EPDM-PP Chip-2: 70 parts by weight of EPDM 330 (Kumho Polychem), 30 parts by weight of PP4017 (Korean emulsifier) and 26 parts by weight of calcium carbonate were mixed, extruded with an extruder and cut by under water cutting to cut 3mm in diameter and 15mm in length. And an elastic chip having an angle of 135 degrees. Specific gravity was 1.0.

Example 4

EPDM-PP chip-2: 70 parts by weight of EPDM 330 (manufactured by Kumho Polychem), 30 parts by weight of PP4017 (Korean emulsifier) and 26 parts by weight of calcium carbonate were mixed, extruded with an extruder and cut by under water cutting to cut 3 mm in diameter and 30 mm in length. And an elastic chip having an angle of 135 degrees. Specific gravity was 1.0.

Comparative Example 5

EPDM-PP Chip-2: 70 parts by weight of EPDM 330 (Kumho Polychem), 30 parts by weight of PP4017 (Korean emulsifier) and 26 parts by weight of calcium carbonate were mixed, extruded with an extruder and cut by under water cutting to cut 3mm in diameter and 15mm in length. And an elastic chip having an angle of 80 degrees. Specific gravity was 1.0.

Example 5

EPDM-PP Chip-3: 70 parts by weight of EPDM 330 (manufactured by Kumho Polychem), 30 parts by weight of PP4017 (Korean emulsifier) and 26 parts by weight of calcium carbonate were mixed, extruded by an extruder, and cut by strand cutting to cross section (1 mm). x 3mm squares intersected with ten crosses) to obtain an elastic chip having a height of 15 mm and an angle of 180 degrees. Specific gravity was 1.0.

Example 6

EPDM-PP Chip-3: 70 parts by weight of EPDM 330 (Kumho Polychem), 30 parts by weight of PP4017 (Korean emulsifier) and 26 parts by weight of calcium carbonate were mixed, extruded by an extruder and cut by under water cutting to make a cross section (cross) 1mm x 3mm squares cross each other with a cross) and an elastic chip having a height of 15mm and an angle of 135 degrees was obtained. Specific gravity was 1.0.

Example 7

EPDM-PP Chip-3: 70 parts by weight of EPDM 330 (Kumho Polychem), 30 parts by weight of PP4017 (Korean emulsifier) and 26 parts by weight of calcium carbonate were mixed, extruded by an extruder and cut by under water cutting to make a cross section (cross) 1mm x 3mm squares cross each other with ten crosses) to obtain an elastic chip having a height of 30mm and an angle of 135 degrees. Specific gravity was 1.0.

After filling the 1L measuring cylinder with the elastic chip prepared from Comparative Examples and Examples, the porosity was measured by measuring the weight, and the workability and water permeability were evaluated as follows.

Evaluation of workability: nails having a nail head of 5 mm in diameter were placed in a plywood of 30 cm x 30 cm and 10 mm thick so that the nail length was 30 mm at intervals of 10 mm each horizontally and vertically, and placed in a container having an inner surface of 30 cm x 30 cm x 50 mm. . There, evenly weighed 1 kg of filler and visually observed how much filler remained on the nail head without falling to the floor. 5 times each. The more elastic filler remaining on the nail head, the more 'bad', the less it was determined as 'good'.

Permeability Evaluation: One side of a 10 cm inner transparent tube was covered with a mesh of 2 mm mesh, fixed with a rubber band, and filled with an elastic chip to a height of 50 mm. Place the elastic chip filled transparent tube on the rubber plate of hardness Shore A 40, press it firmly, pour 2 kg of water into it, make sure the water is not leaking on the bottom, and lift the tube momentarily to measure the time when the water falls out. It was. At this time, if the water runs out within 5 seconds, 'good', if the water takes more than 5 seconds to 'bad'.

Tables 1 and 2 show the results of permeability and workability.

	비교예 1Comparative Example 1	비교예 2Comparative Example 2	비교예 3Comparative Example 3	실시예 1Example 1	실시예 2Example 2	비교예 4Comparative Example 4
	EPDM칩EPDM Chip	SEBS칩SEBS Chip	EPDM-PP칩-1EPDM-PP Chip-1	EPDM-PP칩-2EPDM-PP Chip-2	EPDM-PP칩-2EPDM-PP Chip-2	EPDM-PP칩-2EPDM-PP Chip-2
칩 성상Chip appearance	2-4mm 분쇄2-4mm grinding	구상conception	원형 단면 (L/D = 1.5)Circular cross section (L / D = 1.5)	원형 단면(L/D = 5)Circular cross section (L / D = 5)	원형 단면(L/D = 10)Circular cross section (L / D = 10)	원형 단면(L/D = 23)Circular cross section (L / D = 23)
각도Angle			180도180 degrees	179도179 degrees	179도179 degrees	179도179 degrees
1 리터의 무게Weight of 1 liter	782g782 g	710g710 g	685g685 g	511g511 g	461g461 g	432g432 g
공극율Porosity	21%21%	29%29%	31%31%	48%48%	53%53%	56%56%
투수성Permeability	불량Bad	불량Bad	불량Bad	양호Good	양호Good	양호Good
시공성Constructability	양호Good	양호Good	양호Good	양호Good	양호Good	불량Bad

	실시예 3Example 3	실시예 4Example 4	비교예 5Comparative Example 5	실시예 5Example 5	실시예 6Example 6	실시예 7Example 7
	EPDM-PP칩-2EPDM-PP Chip-2	EPDM-PP칩-2EPDM-PP Chip-2	EPDM-PP칩-2EPDM-PP Chip-2	EPDM-PP칩-3EPDM-PP Chip-3	EPDM-PP칩-3EPDM-PP Chip-3	EPDM-PP칩-3EPDM-PP Chip-3
칩 성상Chip appearance	원형 단면 (L/D = 5)Circular cross section (L / D = 5)	원형 단면 (L/D = 10)Circular cross section (L / D = 10)	원형 단면 (L/D = 5)Circular cross section (L / D = 5)	열십자 단면(L/D = 5)Crisscross section (L / D = 5)	열십자 단면(L/D = 5)Crisscross section (L / D = 5)	열십자 단면(L/D = 10)Crisscross section (L / D = 10)
각도Angle	135도135 degrees	135도135 degrees	80도80 degrees	179도179 degrees	135도135 degrees	135도135 degrees
1 리터의 무게Weight of 1 liter	492g492 g	433g433 g	397g397 g	462g462 g	445g445 g	412g412 g
공극율Porosity	50%50%	56%56%	60%60%	53%53%	55%55%	58%58%
투수성Permeability	양호Good	양호Good	양호Good	양호Good	양호Good	양호Good
시공성Constructability	양호Good	양호Good	불량Bad	양호Good	양호Good	양호Good

As shown in the results of Tables 1 and 2, the elastic chips of Examples 1 to 7 have an L / D of 2 to 20 and an angle of 90 to 179 degrees, and have a high porosity, and thus have excellent water permeability and excellent workability. There is this.

Claims

As an elastic chip for artificial turf filling and ground packaging,

The elastic chip comprises a rubber-based polymer material, at least in the form of a rod-shaped structure having a longitudinal length longer than the cross-sectional diameter,

The length of the elastic chip 2 to 20 times the cross-sectional diameter of the artificial turf filling and ground packaging elastic chip.
According to claim 1,

The elastic chip is projected in the vertical direction in the longitudinal direction, the artificial turf filling and ground packaging elastic chip having a wing extending in the longitudinal direction from one end to the other end.
According to claim 1,

When the center point of the entire length of the elastic chip is referred to as M and the cross-section center points at both ends are A1 and A2, respectively, the angle between the line segment MA1 and the line segment MA2 is 90 to 180 degrees. Elastic chip.
According to claim 1,

When the center point of the entire length of the elastic chip is M and the cross-section center points at both ends are A1 and A2, respectively, the angle between the line segment MA1 and the line segment MA2 is 90 to 179 degrees. Elastic chip.
According to claim 1,

The rubber-based polymer material is an artificial grass filling and ground packaging elastic chip that is a rubber alone or a mixture of rubber and plastic.
According to claim 1,

Elastic chip for artificial turf filling and ground packaging that the porosity of the elastic chip is 40 ~ 70%.
Preparing an elastic filler composition;

Injecting the composition into an extruder; And

Comprising a step of obtaining an elastic chip by cutting the polymer melt processed by the extruder,

The cutting of the polymer melt is performed so that the length / diameter ratio of the elastic chip is 2 to 20 times the artificial turf filling and ground packaging elastic chip manufacturing method.
Backing;

A grass pile extending upward from the bubble;

An inorganic filler layer comprising sand or silica sand filled on the bubble such that the grass pile is partially submerged; And

Artificial turf comprising an elastic filler layer comprising the elastic chip according to any one of claims 1 to 6 disposed on the inorganic filler layer.