KR102244250B1 - Manufacturing method of artificial turf pile yarn and artificial turf pile yarn according to the method - Google Patents

Abstract

The artificial turf pile according to an embodiment of the present invention includes a first linear low density polyethylene resin containing 1 to 5 long chain branches per 1,000 carbons of the main chain and per 1,000 carbons of the main chain. Preparing a mixed resin by mixing a second linear low density polyethylene (Linear Low Density Polyethylene) resin including 10 to 50 short chain branches; Extruding the mixed resin to prepare a monofilament; And stretching the prepared monofilament.

Description

Artificial turf pile yarn manufacturing method and artificial turf pile yarn according to the method {Manufacturing method of artificial turf pile yarn and artificial turf pile yarn according to the method}

The present invention relates to a method for manufacturing an artificial turf pile yarn and an artificial turf pile yarn according to the method.

As the quality of life improves, the desire for a pleasant environment and the desire for health promotion are increasing day by day. Accordingly, various sports facilities such as soccer fields, baseball fields, tennis courts, gateball fields, and multi-purpose stadiums using artificial turf are formed in various places, and the floor surface of these sports facilities is formed of artificial turf material to make the facility more comfortable for users. There is a trend to make them available.

Such artificial turf is mainly produced by planting various resins in the form of pile yarns in the base material, and has the advantage of not being limited by environmental conditions because it has an artificial turf shape, but its use is limited because it is inferior to natural turf in terms of texture. Became.

However, in recent years, fibril is used as a material close to natural turf to mitigate friction, thereby minimizing the splashing phenomenon of the filler material, and evenly laying the filler material inside, so that there is little change in the flatness of the entire land even for a long period of use. The technology was developed in the direction of becoming.

Since the condition of the pile yarn is determined according to the durability and orientation of the raw material itself, the raw material for artificial turf and its composition are very basic and important factors.

The resin used as a raw material for artificial turf is polypropylene, nylon, etc., which are melt-spun and processed into monofilaments, and rubber is coated on their surfaces to improve the properties of artificial turf.

The polypropylene pile yarn for artificial turf is used as a popular product because the cost is reduced because the cost of the raw material is relatively economical compared to nylon, but the photodecomposition rate by ultraviolet rays is somewhat high.

In addition, the nylon pile yarn for artificial turf has excellent tensile strength, abrasion resistance, and bending recovery, and has a low deformation rate due to ultraviolet rays from sunlight, but has a disadvantage in that it has poor skin friction.

In recent years, artificial turf using polyethylene yarn has appeared in order to compensate for the above problems.

As an example of artificial turf using the polyethylene pile yarn, Korean Patent Registration No. 10-1028574 (composition using artificial turf yarn and yarn using the same) has been presented.

These artificial turf yarn compositions and pile yarns using the same are formed in fibrillate form using a composition of linear low-density polyethylene and medium-density polyethylene in a composition ratio of 80:20 to 20:80% by weight, showing a soft touch like natural grass. It also has the advantage of having tensile strength, weather resistance, abrasion resistance and uprightness.

However, since the conventional composition for using artificial turf piles and the pile yarn using the same is formed mainly of polyethylene pile yarns such as linear low-density polyethylene and medium-density polyethylene, it has excellent bulky properties, which is a soft touch, and is widely used in various products. As a material to be used, especially for sports grounds, sports facilities, landscaping, etc., there is a problem of weak strength such as abrasion resistance.

KR 10-1028574 B1 (2011.04.04.Registration)

It is an object of the present invention to provide a method for manufacturing an artificial turf pile yarn having excellent abrasion resistance while having a touch similar to that of natural turf, having excellent elastic recovery power and pile uprightness, and an artificial turf pile yarn according to the method.

The artificial turf pile according to an embodiment of the present invention includes a first linear low density polyethylene resin containing 1 to 5 long chain branches per 1,000 carbons of the main chain and per 1,000 carbons of the main chain. Preparing a mixed resin by mixing a second linear low density polyethylene (Linear Low Density Polyethylene) resin including 10 to 50 short chain branches; Extruding the mixed resin to prepare a monofilament; And stretching the prepared monofilament.

The first linear low density polyethylene resin has a density of 0.916 to 0.918 g/cm ³ , a melt index (MI) of 0.8 to 4.5 g/10 min, and the second linear low density polyethylene resin has a density of 0.916 to 0.920 g/cm ³ , and the melt index may be 0.8 to 4.5g/10min.

The first linear low-density polyethylene resin and the second linear low-density polyethylene resin are at least one selected from the group consisting of ethylene and α-olefins having 3 to 8 carbon atoms in the presence of a metallocene catalyst. It may be copolymerized.

The α-olefin may be a 1-hexene-α-olefin having 6 carbon atoms.

The mixed resin may be a mixture of the first linear low-density polyethylene resin and the second linear low-density polyethylene resin in a weight ratio of 7:3 to 3:7.

Before the step of extruding the mixed resin to produce the monofilament, it may further include introducing at least one selected from the group of functional additives consisting of a UV stabilizer, a pigment, a flame retardant, an anti-aging agent, an antioxidant, and a lubricant.

The functional additive may be added to 0.5 to 8.5% by weight based on 100% by weight of the total mixed resin.

The stretching may be performed at a stretching ratio of 2 to 5.

The artificial turf pile according to another embodiment of the present invention may be manufactured by the above-described method and may have a tensile strength of 0.5 to 0.9 gf/d and an elongation of 50 to 90%.

The artificial turf structure according to another embodiment of the present invention is a base paper, a pile of artificial turf piles manufactured by the above method, and tufted on the base paper, and the pile is back-coated on the rear surface of the base paper so that the pile is not pulled out. It includes a back coating layer to prevent.

The back coating layer may include at least one selected from the group consisting of polyethylene, polyester, and polyamide.

Using the artificial turf pile yarn manufacturing method according to the present invention and the artificial turf pile yarn according to the method, it is possible to provide artificial turf having excellent abrasion resistance while having a touch similar to that of natural turf, excellent elastic resilience and pile uprightness. It works.

1 shows a method of manufacturing an artificial turf pile yarn according to an embodiment of the present invention.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in the drawings, the same components or parts denote the same reference numerals as possible. In describing the present invention, detailed descriptions of related known functions or configurations are omitted so as not to obscure the subject matter of the present invention.

The terms about, substantially, etc. of the degree used in the present specification are used at or close to the numerical value when manufacturing and material tolerances specific to the stated meaning are presented, and are used to help understanding the present invention. Absolute figures are used to prevent unreasonable use of the stated disclosure by unconscionable infringers.

1 shows a method of manufacturing an artificial turf pile yarn according to an embodiment of the present invention.

Hereinafter, a method of manufacturing an artificial turf pile yarn according to an embodiment of the present invention will be described with reference to FIG. 1.

The method of manufacturing an artificial turf pile according to an embodiment of the present invention includes a first linear low-density polyethylene resin including 1 to 5 long chain branches per 1,000 carbons of the main chain and 25 to 50 per 1,000 carbons of the main chain. Preparing a mixed resin by mixing a second linear low-density polyethylene resin including short chain branches (S100); Extruding the mixed resin to produce a monofilament (S200); And it includes a step (S300) of stretching the prepared monofilament.

First, the first linear low-density polyethylene resin containing 1 to 5 long chain branches per 1,000 carbons of the main chain and the second linear having 25 to 50 short chain branches per 1,000 carbons of the main chain This is a step (S100) of preparing a mixed resin by mixing a low-density polyethylene resin.

The first and second linear low-density polyethylene resins are basic components constituting the artificial turf pile yarn of the present invention.

The first linear low-density polyethylene resin and the second linear low-density polyethylene resin are at least one selected from the group consisting of ethylene and α-olefins having 3 to 8 carbon atoms in the presence of a metallocene catalyst. It can be produced by copolymerization.

The α-olefin refers to an olefin in which a double bond is formed on the first carbon. That is, the olefin in which a double bond is formed on carbon 1 and 2 refers to an α-olefin, and in the case of 1-hexene-α-olefin, a double bond is formed on the first carbon, and an olefin consisting of 6 carbons is used. it means.

The α-olefin having 3 to 8 carbon atoms means 1-butene, 1-pentene, 4-methyl-1-pentene, and 1-hexene having 3 to 6 carbon atoms, and in the present invention, the α-olefin has It is possible to use 6-membered 1-hexene-α-olefin.

The long-chain branching is determined by LCB by size exclusion chromatography-multiple scattering method (SEC-MALS). The measurement method of long-chain branching and long-chain branching is “SEC-MALS method for measuring long-chain branching and long-chain branching distribution in polyethylene”. Documents by Yu et al. described in Polymer (2005) Volume: 46, Issue: 14, Pages: 5165-5182. You can check it in.

The polyethylene resin including the long-chain branch, that is, the branched polyethylene resin has a narrow molecular weight distribution compared to general polyethylene.

The first linear low-density polyethylene resin, that is, the ethylene/α-olefin copolymer, may exhibit better processability than a copolymer that does not contain long chain branches or has 5 or more long chain branches per 1,000 carbons along the main chain of the copolymer. have.

In addition, the second linear low-density polyethylene resin, that is, the ethylene/α-olefin copolymer containing short-chain branches does not contain short-chain branches or has 25 to 50 or more short-chain branches per 1,000 carbons along the main chain of the copolymer. Compared to coalescence, it can exhibit better processability.

The metallocene catalyst refers to a catalyst in which two cyclopentanienyl ligands are bonded to one side and the other ligand is bonded to the other side to a group 4 transition metal.

In the present invention, the metallocene catalyst is an ansa-metallocene catalyst in which two ligands are bridged through a bridge bond, and has two Cp-based ligands, so that C ₂ -symmetric ansa-metallocene catalyst, C ₂ -has no symmetry. An asymmetric ansa-metallocene catalyst having σ-symmetry, an ansa-metallocene catalyst having no symmetry at all can be used, and preferably a symmetric ansa-metallocene catalyst can be used.

In addition, a bridge bond composed of two ligands may be ethylene or dimethyl silyl, and in this case, there is an effect of showing high catalytic activity and stereoregularity.

The first linear low density polyethylene resin has a density of 0.916 to 0.918 g/cm ³ , a melt index (MI) of 0.8 to 4.5 g/10 min, and the second linear low density polyethylene resin has a density of 0.916 to 0.920 g/cm ³ , and the melt index may be 0.8 to 4.5g/10min.

The mixed resin may mix the first linear low density polyethylene resin and the second linear low density polyethylene resin in a weight ratio of 7:3 to 3:7.

Next, it is a step (S200) of producing a monofilament by extruding the mixed resin.

The step of preparing the monofilament is a step of injecting the prepared mixed resin into a spinning machine for producing artificial turf to produce an artificial turf monofilament.

At this time, the spinning machine for manufacturing artificial turf may use a conventional spinning machine including a nozzle. In addition, in order to change the shape of the cross section of the artificial turf monofilament, a physical means may be additionally provided inside the nozzle of the radiator.

The mixed resin may be molded from a nozzle and discharged in the longitudinal direction of the monofilament to manufacture artificial turf monofilament.

Since the pressure, temperature, etc. of the artificial turf manufacturing radiator are conventional techniques, they will not be described.

The present invention is one selected from the group of functional additives consisting of UV stabilizers, pigments, flame retardants, antioxidants, antioxidants, and lubricants before the step of producing monofilament by extruding the mixed resin in order to further improve the performance of the artificial turf pile yarn. It may further include the step of injecting the above. That is, the functional additive may be added to the spinning machine for manufacturing the artificial turf to prepare a monofilament.

The UV stabilizer may use at least one selected from the group consisting of benzophenone, benzotriazole, and hindered amine, but is not limited thereto.

The anti-aging agent prevents the pile yarns from aging in solar heat, and may be phenylbetanaphthylamine.

The antioxidant may prevent the pile from being embrittled by heat, and may improve heat resistance.

The pigment is for imparting color to artificial turf like natural turf, and in order to improve dispersibility, a color master batch prepared by adding a pigment to a transparent resin may be used. Although the type of the transparent resin is not limited, it is preferable that it is a linear low-density polyethylene resin most often included in artificial turf pile yarns.

The flame retardant may be one or more selected from the group consisting of a phosphorus-based flame retardant, a metal hydrate-based flame retardant, a halogen-based flame retardant, a flame retardant aid, and a mixture thereof, but is not limited thereto.

The lubricant is paraffin wax, oxidized paraffin wax (Oxydiertes Paraffin), stearic acid, cetyl alcohol, stearyl alcohol, and glycerol mono stearate (GMS). , Glycerol mono oleate (GMO), Stearyl stearate, Calcium stearate, Magnesium stearate, Zinc stearate, Erucamide, It may be one or more selected from the group consisting of oleamide and steramid.

The lubricant can be divided into an internal lubricant and an external lubricant, and the external lubricant can improve flowability when manufacturing monofilament by imparting releasability between the metal surfaces of the spinning machine for manufacturing artificial turf, and the internal lubricant is a linear polyethylene resin. By infiltrating into the molecules of the chains and causing the chains to slide together, there is an effect of improving the flow between molecules.

The functional additive, based on 100% by weight of the total mixed resin, can be added 0.5 to 8.5% by weight, if the content of the functional additive is less than 0.5% by weight, the effect is insignificant, and if it exceeds 8.5% by weight, polyethylene and Since the additives are not properly mixed and the dimensional stability is deteriorated, the above range is preferable.

Finally, it is a step (S300) of stretching the prepared monofilament.

The step of stretching the manufactured monofilament (S300) includes a process of rapidly cooling the manufactured monofilament, a process of reheating the cooled monofilament, and a process of stretching and winding the reheated monofilament. can do.

The cooling may be performed at a temperature of 15 to 30°C, and stretching may be performed at a temperature of 70 to 100°C with a draw ratio of 2 to 5.

If the cooling temperature is less than 15°C, there is a disadvantage in that physical properties of the pile yarn are deteriorated due to a rapid cooling phenomenon, and when the cooling temperature exceeds 30°C, there is a problem that the shape stability of the pile yarn is deteriorated.

In addition, when the stretching temperature is less than 70°C, workability is poor, and when it exceeds 100°C, there is a problem in that the shape stability of the manufactured pile is deteriorated.

If the draw ratio is less than 2, dimensional stability is deteriorated, and if the draw ratio is more than 5, not only the stretchability is deteriorated, but also the touch is stiff, which is not preferable.

The stretched monofilament may further include a drying process.

The drying may be performed at a temperature of 70 to 100°C, and if the drying temperature is less than 70°C, the draw ratio cannot be maintained, and if the drying temperature exceeds 100°C, there is a problem that the feel of the pile yarn becomes rough, so the above range is preferable. .

The artificial turf pile manufactured by the above method is characterized in that the tensile strength is 0.5 to 0.9 gf/d, and the elongation is 50 to 90%.

In addition, the present invention provides an artificial turf structure using an artificial turf pile manufactured according to the method for manufacturing the artificial turf pile.

An artificial turf structure according to another embodiment of the present invention is a base paper, a pile tufted on the base paper, and a pile composed of the artificial turf pile yarn, and a back coating layer that is back-coated on the rear surface of the base paper to prevent the pile from being pulled out. Includes.

The pile yarn may be 13,000 to 14,000 denier/6 filament.

The artificial turf pile yarn may have a length of 35 to 55 mm based on the upper surface of the base paper.

The base fabric may be a polyolefin-based woven fabric, and specifically, the polyolefin-based woven fabric may be polyetherene or polypropylene.

The back coating layer may be at least one selected from the group consisting of polyethylene, polyester, and polyamide, and specifically, a nonwoven fabric made of at least one selected from the group consisting of polyethylene, polyester, and polyamide. I can.

The back coating layer may be formed by a dry heat fusion method, but is not limited thereto. In addition, the dry heat fusion temperature may be performed at a temperature at which the shape of the pile will not change.

A filler may be further included between the pile and the back coating layer.

The filler is a synthetic resin filler, and the synthetic resin filler may include at least one selected from the group consisting of styrene-ethylene-butadiene-styrene, ethylene vinyl alcohol, polypropylene, polyethylene, and nylon. Patent, it is better to include styrene-ethylene-butadiene-styrene, and the styrene-ethylene-butadiene-styrene can provide excellent impact relief function, and it is economical and exhibits an eco-friendly effect that does not contain sulfur or carcinogens. There is an advantage to be able to.

The size of the filler may be 2 to 3 mm, but is not limited thereto.

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, the first linear low-density polyethylene resin made of ethylene and 1-hexene-α-olefin under a metalocene catalyst and containing 1 to 5 long-chain branches per 1,000 carbons of the main chain, and ethylene and 1-hexene under a metalocene catalyst. It was prepared by purchasing a second linear low-density polyethylene resin made of -α-olefin and containing 10 to 50 short-chain branches per 1,000 carbons of the main chain.

A mixed resin was prepared by mixing 800 g of the purchased first linear low-density polyethylene and 200 g of the second linear low-density polyethylene.

1 g of master batch, flame retardant, anti-aging agent, and antioxidant were mixed in the prepared mixed resin and added to the spinning machine.

The mixed resin injected into the spinning machine was extruded to prepare a monofilament. Then, it was cooled at a temperature of 25° C., and then reheated to a temperature of 80° C. and stretched to a draw ratio of 3, and dried at a temperature of 70° C. for 1 hour to prepare an artificial turf pile yarn.

Comparative Example 1

1-butene α-olefin copolymerized linear low-density polyethylene and high-density polyethylene resin prepared under a Ziegler-Natta catalyst were purchased and prepared.

A mixed resin was prepared by mixing 800 g of linear low-density polyethylene prepared with a Ziegler-Natta catalyst and 200 g of a high-density polyethylene resin.

1 g of master batch, flame retardant, anti-aging agent, and antioxidant were mixed in the prepared mixed resin and added to the spinning machine.

The mixed resin injected into the spinning machine was extruded to prepare a monofilament. Then, it was cooled at a temperature of 25° C., and then reheated to a temperature of 80° C. and stretched to a draw ratio of 3, and dried at a temperature of 70° C. for 1 hour to prepare an artificial turf pile yarn.

Comparative Example 2

It was prepared in the same manner as in Comparative Example 1, but an artificial turf pile was prepared using 1-octene α-olefin copolymerized linear low density polyethylene instead of 1-butene-α-olefin copolymer linear low density polyethylene.

Comparative Example 3

An artificial turf pile was prepared in the same manner as in Comparative Example 1, but without preparing a mixed resin, using only 1-Hexene-α-olefin copolymerized linear low-density polyethylene under a metallocene catalyst.

In this case, the linear low-density polyethylene includes 30 SCBs (Short chain branches) per 1,000 carbons.

Comparative Example 4

It was prepared in the same manner as in Comparative Example 3, but without preparing a mixed resin, and using only 1-Hexene α-olefin copolymerized linear low-density polyethylene under a metallocene catalyst, an artificial turf pile was prepared.

At this time, three LCBs (Linear Low Density Polyethylene) per 1,000 carbons of the linear low density polyethylene are included.

Experimental Example 1

The tensile strength and elongation of the artificial turf piles manufactured according to Example 1 and Comparative Examples 1 to 4 were compared (Poor (1) to Good (5)) and shown in Table 1 below.

File company Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Tensile strength (gf/d) 4 5 5 2 5 Elongation(%) 4 4 4 5 3

As can be seen in Table 1, it can be seen that there is no significant difference between Example 1 and Comparative Examples 1 and 2, but in the case of Comparative Examples 3 to 4, it can be seen that a significant difference in tensile strength and elongation is shown.

Experimental Example 2

The softness, abrasion resistance, and elastic recovery of structures using pile yarns for artificial turf manufactured according to Example 1 and Comparative Examples 1 to 4 were compared and shown in Table 2 below.

Structure Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 soft castle 5 One One 5 5 Wear resistance 4 4 5 3 4 Elasticity recovery 4 3 3 3 4

As can be seen in Tables 1 and 2, it can be seen that the artificial turf structure made of pile yarn of Example 1 has improved softness compared to the artificial turf structure made of pile yarns of Comparative Examples 1 and 2, and Comparative Example 3 And it can be seen that the tensile strength and elongation are improved in balance compared to the artificial turf structure made of the pile yarn of 4.

S100: mixed resin manufacturing step
S200: Monofilament manufacturing step
S300: Monofilament stretching step

Claims (11)

First Linear Low Density Polyethylene resin containing 1 to 5 long chain branches per 1,000 carbons of the main chain and 10 to 50 short chain branches per 1,000 carbons of the main chain Preparing a mixed resin by mixing the second linear low density polyethylene (Linear Low Density Polyethylene) resin in a weight ratio of 7:3 to 3:7;
Extruding the mixed resin to prepare a monofilament; And
Including the step of stretching the prepared monofilament at a temperature of 70 ~ 100 ℃ with a draw ratio of 2 to 5,
The first linear low density polyethylene resin and the second linear low density polyethylene resin,
It is a copolymerization of ethylene (Ethylene) and 1-hexane-α-olefin having 6 carbon atoms in the presence of a metallocene catalyst,
The first linear low density polyethylene resin,
The density is 0.916 to 0.918 g / cm ³ , the melt index (MI) is 0.8 to 4.5 g / 10 min,
The second linear low density polyethylene resin has a density of 0.916 to 0.920 g/cm ³ , a melt index of 0.8 to 4.5 g/10 min,
The tensile strength is 0.5 ~ 0.9 gf / d, characterized in that the elongation is 50 ~ 90%,
Manufacturing method of artificial turf pile yarn. delete delete delete delete In claim 1,
Before the step of producing a monofilament by extruding the mixed resin
It characterized in that it further comprises the step of introducing at least one selected from the group of functional additives consisting of UV stabilizers, pigments, flame retardants, anti-aging agents, antioxidants, and lubricants,
Manufacturing method of artificial turf pile yarn. In paragraph 6,
The functional additive,
Based on 100% by weight of the total mixed resin, characterized in that 0.5 to 8.5% by weight is added,
Manufacturing method of artificial turf pile yarn. delete Prepared by the method of any one of claims 1 and 6 to 7,
Artificial turf pile company. Bubble Paper,
A file that is tufted on the base paper and composed of the artificial turf pile yarn of any one of claims 1 and 6 to 7, and
It characterized in that it comprises a back coating layer that is back coated on the rear surface of the base paper to prevent the pile from being pulled out,
Artificial turf structure. In claim 10,
The back coating layer,
Characterized in that it comprises at least one selected from the group consisting of polyethylene, polyester, and polyamide,
Artificial turf structure.

Images