KR20210023003A - Polyethylene Resin Composition for Artificial turf fiber, and Artificial turf fiber using the same - Google Patents

Abstract

The present invention relates to a polyethylene resin composition for artificial turf yarn and artificial turf yarn using the same and, more specifically, to a technique in which a first metallocene polyethylene resin is mixed with a second metallocene polyethylene resin or a Ziegler-Natta polyethylene resin, leading to a high modulus of elasticity, a reduced degree of wear, enhanced restoring force, and improved properties, such as feel, elongation, and tearing.

Description

Polyethylene Resin Composition for Artificial Turf Fiber, and Artificial Turf Fiber Using the Same}

The present invention relates to a polyethylene resin composition for artificial turf yarn and an artificial turf yarn using the same, and more particularly, by mixing a second metallocene polyethylene resin or a Ziegler-Natta polyethylene resin with a first metallocene polyethylene resin, abrasion degree and It relates to a technology that improves physical properties such as resilience improvement, tension, tear, and touch.

Natural turf is showing a low penetration rate due to the difficulty of maintenance and high maintenance cost, while artificial turf is mainly installed in sports stadiums, playgrounds, and vacant lots of public facilities while overcoming the problems of natural turf. Artificial-turf (artificial-grass) has been mainly used in sports grounds since it was first manufactured in the United States, and recently, it is a landscaping material in indoor gardens where lawn growth is impossible or outdoor areas in high-rise buildings with limited sunlight time. It is being expanded and used in the same place.

Plastic resins provided to manufacture such artificial turf have been provided while developing into a first-generation polypropylene resin, a second-generation polyethylene-nylon mixed resin, and a third-generation polyethylene resin. In the case of polyethylene, high-density polyethylene (HDPE), low-density polyethylene (LDPE), and medium-density polyethylene (MDPE) are used as plastic resins to make artificial turf yarn.

However, when the artificial turf yarn using the plastic resin is used for a long period of time due to its material characteristics, the breaking phenomenon is intensified due to the decrease in physical properties such as tensile strength and tear strength, and the life expectancy of the product is shortened. There was a problem in that repair or re-installation costs were incurred. Therefore, in order to improve physical properties such as durability, linear low density polyethylene (LLDPE) has been recently used, and in this case, linear low density polyethylene (LLDPE) is used for ethylene and 1-octene under the Ziegler-Natta catalyst. Monomers are mainly provided.

In recent years, the technology of polyolefin polymerization has advanced considerably due to the development of metallocene catalysts beyond Ziegler-Natta catalysts, and polyolefins polymerized by metallocene catalysts have the advantage of having a uniform molecular structure. . Therefore, the development of applying polyethylene polymerized by a metallocene catalyst to artificial turf is also actively underway.

For example, Korean Laid-Open Patent Publication No. 10-2018-0102213 is a method for producing artificial turf fibers, comprising a polymer mixture 470 comprising 60 to 99% by weight of an LLDPE polymer and 1 to 15% by weight of an LDPE polymer. Manufacturing 502; Extruding (504) the polymer mixture into monofilament (606); Quenching (506) the monofilament; Reheating (508) the monofilament; It provides a method for manufacturing an artificial turf fiber comprising forming the monofilament into an artificial turf fiber 1004 by stretching 510 the reheated monofilament. In this case, in polymerization of the LLDPE, a metallocene catalyst is applied.

For another example, it is possible to include metallocene LLDPE in the polyethylene composition by using a fiber, tape or a method thereof comprising a polyethylene composition obtainable by polymerization of ethylene using a single site catalyst of European Patent Application Publication No. 01972704. It discloses that there is. In addition, it is mentioned that the fiber can be used as an artificial turf fiber composition.

As shown, the development of polyethylene to which a metallocene catalyst is applied is actively in progress, and development research is still required to provide better physical properties. Accordingly, the present invention was completed to develop an artificial turf yarn having excellent durability by improving physical properties such as abrasion properties, tensile elongation, and tear strength of polyethylene to which a metallocene catalyst is applied.

(Patent Document 1) Korean Laid-Open Patent Publication No. 10-2018-0102213 (2018.09.14)

(Patent Document 2) European Patent Publication No. 01972704 (2008.09.24)

It is an object of the present invention to solve all of the above-described problems.

An object of the present invention is to provide a polyethylene resin polymerized by different metallocene catalysts, preferably a linear low density polyethylene (LLDPE) resin, to provide a polyethylene yarn for artificial turf.

Accordingly, the abrasion and elongation of the artificial turf yarn are improved.

In addition, an object of the present invention is to provide an artificial turf yarn having excellent tactile feel while improving restoring force, tensile strength, tear strength, and the like.

In order to achieve the object of the present invention as described above and to realize the characteristic effects of the present invention to be described later, the characteristic configuration of the present invention is as follows.

According to an embodiment of the present invention, based on 50 to 90 parts by weight of the first metallocene polyethylene resin polymerized under the first metallocene catalyst, the second metallocene polyethylene resin polymerized under the second metallocene catalyst, or There is provided a polyethylene resin composition using artificial turf yarn comprising 10 to 50 parts by weight of any one selected from Ziegler-Natta polyethylene resins polymerized under a Ziegler-Natta catalyst.

According to an embodiment of the present invention, based on 50 to 90 parts by weight of the first metallocene polyethylene resin, the second metallocene polyethylene resin may be provided including 10 to 50 parts by weight. Alternatively, based on 70 to 90 parts by weight of the first metallocene polyethylene resin, the Ziegler-Natta polyethylene resin may be provided including 10 to 30 parts by weight.

According to an embodiment of the present invention, the polyethylene is provided with linear low density polyethylene (LLDPE).

According to an embodiment of the present invention, artificial turf yarn comprising the polyethylene resin composition is provided.

According to an embodiment of the present invention, (a-1) a first metallocene polyethylene resin including 1 to 15 parts by weight of a _{C 6 comonomer based on 100 parts by weight of an ethylene monomer, under a first metallocene catalyst.} Polymerizing with; (b-1) gas phase polymerization of a second metallocene polyethylene resin under a second metallocene catalyst, including 1 to 20 parts by weight of a _{C 6} comonomer based on 100 parts by weight of an ethylene monomer; (c-1) preparing a mixed resin by mixing 10 to 50 parts by weight of the second metallocene polyethylene resin with respect to 50 to 90 parts by weight of the first metallocene polyethylene resin; And (d-1) extruding the mixed resin; artificial turf yarn manufacturing method comprising a.

According to another embodiment of the present invention, (a-2) a first metallocene polyethylene resin containing 1 to 15 parts by weight of a _{C 6 comonomer based on 100 parts by weight of an ethylene monomer, under a first metallocene catalyst.} Polymerizing with; (b-2) ethylene monomer based on 100 parts by weight, the resin including a C ₃ of comonomers from 10 to 20 parts by weight and C ₄ of the comonomer to 1 part to 10 parts by weight, Ziegler-under Natta catalyst Ziegler-Natta polyethylene Polymerizing with a resin; (c-2) preparing a mixed resin by mixing 10 to 30 parts by weight of the Ziegler-Natta polyethylene resin with respect to 70 to 90 parts by weight of the first metallocene polyethylene resin; And (d-2) extruding the mixed resin; artificial turf yarn manufacturing method comprising a.

The present invention provides an effect of improving the physical properties of artificial turf yarn by mixing polyethylene resins polymerized by different metallocene catalysts, preferably linear low density polyethylene (LLDPE) resins.

In particular, it provides an artificial turf yarn with improved wear and elongation of the artificial turf yarn.

In addition, it is intended to improve resilience, tensile strength, tear strength, and at the same time provide artificial turf yarn with excellent tactile feel.

Therefore, the artificial turf yarn with improved durability can be used for a long time, thereby providing an effect of improving productivity and economy.

1 is a data value measuring rheological properties according to Examples 1 to 3 and Comparative Examples 1 to 2 of the present invention.
2 is a data value measuring rheological properties according to Examples 4 to 6 and Comparative Examples 1 to 2 of the present invention.

For the detailed description of the present invention to be described below, reference is made to specific embodiments in which the present invention may be practiced as an example. These embodiments are described in detail sufficient to enable a person skilled in the art to practice the present invention. It should be understood that the various embodiments of the present invention are different from each other, but need not be mutually exclusive. For example, specific shapes, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the present invention in relation to one embodiment. In addition, it should be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the present invention. Accordingly, the detailed description to be described below is not intended to be taken in a limiting sense, and the scope of the present invention, if appropriately described, is limited only by the appended claims, along with all ranges equivalent to those claimed by the claims.

Hereinafter, in order to enable those of ordinary skill in the art to easily implement the present invention, it will be described in detail with reference to preferred embodiments of the present invention.

According to the present invention, a polyethylene resin composition for using artificial turf yarn is provided.

In general, the conditions necessary for the yarn for artificial turf are abrasion resistance, stability against UV or heat, high tear strength and physical properties such as tensile elongation and recovery rate, as well as a touch and softness having the characteristics of natural turf as an sensibility characteristic. In general, synthetic resins used for artificial turf yarn or for manufacturing artificial turf are polyethylene (PE), high-density polyethylene (HDPE), low-density polyethylene (LDPE), and medium-density polyethylene (MDPE, Medium). Density Polyethylene) is mainly provided. The above polyethylenes are most often used in artificial turf because they are soft when they come into contact with the skin, and are economical because they are inexpensive. While these are excellent in workability, they have disadvantages of poor durability such as resilience and heat resistance. Therefore, in order to reinforce these shortcomings, linear low density polyethylene (LLDPE) has been recently applied.

In the case of the present invention, in polyethylene (PolyEthylene, PE), preferably, linear low-density polyethylene (LLDPE) is provided to improve abrasion and elongation, and to improve tensile strength, tear strength, and tactile feel.

According to an embodiment of the present invention, based on 50 to 90 parts by weight of the first metallocene polyethylene resin polymerized under the first metallocene catalyst, the second metallocene polyethylene resin polymerized under the second metallocene catalyst, or There is provided a polyethylene resin composition using artificial turf yarn comprising 10 to 50 parts by weight of any one selected from Ziegler-Natta polyethylene resins polymerized under a Ziegler-Natta catalyst.

According to an embodiment of the present invention, the first metallocene catalyst is provided with an EZ catalyst series. Silicon Bridged Bis Ind Type is provided as a series of EZ catalysts.

As the first metallocene catalyst, an EZ-based catalyst, for example, a commercialization catalyst of univation may be provided. M2010EN, a commercial resin of Hanwha Chemical, may be provided as a metallocene linear low-density polyethylene resin polymerized through gas phase polymerization using the EZ-based catalyst. M2010EN is a metallocene linear low-density polyethylene resin with excellent processability, mechanical properties, low temperature sealing properties and elasticity. M2010EN, including LCB (Long Chain Branch), has a high G'(Storage modulus, elastic modulus), so applying it to artificial turf is effective in improving turf restoration and abrasion. In addition, it is not limited to the M2010EN, and the EZ-based catalyst capable of giving the same effect and the linear low-density polyethylene resin polymerized by the EZ-based catalyst can be applied as needed at the level of those skilled in the art.

In addition, in the case of the first metallocene catalyst, it may be represented by the following formula (1).

[Formula 1]

According to an embodiment of the present invention, the density of the first metallocene polyethylene resin is measured by ASTM D1505, provided in the range of 0.910 to 0.920, and the melt index (MI) is measured by ASTM D1238, and 190°C. It may be provided in 0.5 to 5 g / 10 min at 2.16 Kg of, preferably 0.5 to 2 g / 10 min. In addition, the weight average molecular weight is provided as 30,000 to 200,000 g/mol.

According to an embodiment of the present invention, the first metallocene polyethylene resin is characterized in that the polymerization comprises 1 to 15 parts by weight of a _{C 6 co-monomer based on 100 parts by weight of monomer ethylene.} .

In addition, the polyethylene resin polymerized by the first metallocene is a copolymer of ethylene alpha-olefin, and may have 3 to 12 carbon atoms as an alpha-olefin. Preferably 1-hexene may be provided. In this case, the content of comonomer as a comonomer may include 1 to 15 parts by weight.

Meanwhile, according to an embodiment of the present invention, the second metallocene catalyst is provided with an HP catalyst series. Preferably, a non-bridged Bis Cp type is provided as an HP catalyst series. For example, a commercially available metallocene HP-100 series catalyst may be provided. resin) Resin can be provided. For example, commercialized Hanwha Chemical's M1835HN may be provided as a second metallocene polyethylene resin. M1835HN is a metallocene linear low-density polyethylene resin with excellent mechanical properties, low temperature sealing, transparency and processability.

In addition, in the case of the second metallocene catalyst, it may be represented by the following formula (2).

[Formula 2]

According to an embodiment of the present invention, the density of the second metallocene polyethylene resin is measured by ASTM D1505, and is provided in the range of 0.910 to 0.920. The melt index (MI) is measured by ASTM D1238 and is provided as 0.5 to 5 g/10min at 2.16Kg at 190°C. It is preferably provided at 1 to 5 g/10 min. In this case, the second metallocene polyethylene resin has a weight average molecular weight of 30,000 to 200,000 g/mol.

According to an embodiment of the present invention, based on 50 to 90 parts by weight of the first metallocene polyethylene resin polymerized under the first metallocene catalyst, the second metallocene polyethylene resin 10 polymerized under the second metallocene catalyst. There is provided a polyethylene resin composition for artificial turf yarn comprising from to 50 parts by weight.

That is, in order to overcome the shortcomings of low elongation including LCB (Long Chain Branch) contained in the first metallocene polyethylene resin, the second metal polymerized under the condition of the second metallocene, which is a high-strength metallocene catalyst. It can be supplemented with a rosen resin. In the case of the second metallocene polyethylene resin, the effect of improving the tactile feel, tensile strength, and tear strength is provided by applying low density LLDPE. In particular, in the case of including the above range, this effect can be maximized, which can be confirmed in Table 2 and Figure 1 of the Examples described later. In the case of FIG. 1, data values obtained by measuring rheological properties according to Examples 1 to 3 and Comparative Examples 1 to 2 are shown.

In (a) of FIG. 1, it can be seen that in Examples 1 to 3, the processing is excellent in that the viscosity in the processing region (Frequency = 10 rad/s) or higher is lower than that of Comparative Example 1.

In addition, through the point that G'(Storage modulus, elasticity) in the initial G” (Loss modulus, viscosity) in FIG. 1B is higher than that of Comparative Example 1, it can be confirmed that the resilience, touch and abrasion of the turf are excellent. have.

According to an embodiment of the present invention, the second metallocene polyethylene resin is polymerized by including 1 to 20 parts by weight of a _{C 6 comonomer based on 100 parts by weight of the monomer ethylene.} The polyethylene resin polymerized by the second metallocene is a copolymer of ethylene alpha-olefin, and may have 3 to 12 carbon atoms as an alpha-olefin. Preferably 1-hexene may be provided. In this case, the content of comonomer as a comonomer may include 1 to 20 parts by weight.

According to an embodiment of the present invention, the Ziggler-Natta catalyst refers to a commonly used Ziegler-Natta catalyst, and a transition metal compound belonging to Group IV, V or VI of the Periodic Table of the Elements is used as the main catalyst. As a cocatalyst, an organometallic compound of Group II or III of the Periodic Table of the Elements can be used, and the most commonly used Ziegler-Natta catalyst can be provided with a halogenated complex composed of magnesium and titanium, and the cocatalyst is organic. Aluminum compounds may be provided together. Preferably, in the case of the Ziegler-Natta catalyst provided in the present invention, it means a Ziegler-Natta catalyst in which TiCl _{4 is supported on an MgCl 2} carrier, but is not limited thereto, and a Ziegler-Natta catalyst known in the art may be provided without limitation. have.

For example, a commercially available catalyst of Z-216 may be provided, and Hanwha Chemical's 3325W, which is a linear low density polyethylene resin polymerized by applying the same, may be provided. 3325W is a resin with excellent processability and mechanical properties.

In addition, the density of the Ziegler-Natta polyethylene resin is provided in the range of 0.900 to 0.920 by ASTM D1505 measurement, and the melt index (MI) is provided in 0.5 to 5 g/10min at 2.16Kg at 190°C by ASTM D1238 measurement. . It is preferably provided at 1 to 3 g/10min. The weight average molecular weight is provided as 30,000 to 200,000 g/mol.

According to an embodiment of the present invention, based on 50 to 90 parts by weight of the first metallocene polyethylene resin polymerized under the first metallocene catalyst, 10 to 50 parts by weight of the Ziegler-Natta polyethylene resin polymerized under the Ziegler-Natta catalyst. A polyethylene resin composition for using artificial turf yarn is provided, including. Preferably, based on 70 to 90 parts by weight of the first metallocene polyethylene resin, the Ziegler-Natta polyethylene resin may contain 10 to 30 parts by weight.

That is, by mixing the Ziegler-Natta polyethylene resin with the first metallocene polyethylene resin, the aforementioned second metallocene polyethylene resin is included in the first metallocene polyethylene resin to overcome the disadvantage of low elongation. The same effect can be provided, and tensile strength and tear strength can also be improved. This can be confirmed in Table 3 and FIG. 2 to be described later.

Looking at (a) of FIG. 2, it can be seen that the processability is excellent in light of the fact that the viscosity in the processing region Frequency=10 rad/s or more is lower than that of Comparative Example 1.

In addition, looking at (b) of Figure 2, in light of the point that G'(Storage modulus, elasticity) in the initial G” (Loss modulus, viscosity) is higher than that of Comparative Example 1, the turf has excellent resilience, touch and abrasion. can confirm.

According to one embodiment of the invention, the Ziegler-to receive a polyethylene resin with respect to the monomer ethylene 100 parts by weight of C ₃ of the comonomer is 10 to 20 parts by weight comprising a, and C ₄ of the comonomer comprises from 1 to 10 parts by weight Polymerized. The polyethylene resin polymerized by Ziegler-Natta is a copolymer of ethylene alpha-olefin, and may have 3 to 12 carbon atoms as an alpha-olefin. Preferably 1-hexene may be provided. In this case, the content of the comonomer as a comonomer may include 1 to 20 parts by weight of 1-propene and 1 to 10 parts by weight of 1-butene.

According to an embodiment of the present invention, the polyethylene resin composition for use of artificial turf yarn may include at least one or more selected from a stabilizer, an antioxidant, a filler, and a colorant, and may be added or subtracted as necessary. However, it is not limited thereto.

According to an embodiment of the present invention, the stabilizer may be provided with a heat or UV stabilizer. It may contain 0.1 to 3 parts by weight based on 100 parts by weight of the polyethylene resin.

In the case of the thermal stabilizer, a metallic thermal stabilizer and a non-metallic thermal stabilizer can be used, and as the metallic thermal stabilizer, an organic tin-based thermal stabilizer, a mercaptide-based organic tin thermal stabilizer, a carboxylic acid salt-based organic tin thermal stabilizer, and carboxylic acid Metal salt-based thermal stabilizers may be provided. As the non-metallic thermal stabilizer, an epoxy compound and an organic phosphite may be provided.

Organic phosphorous acid-based thermal stabilizers include triphenyl phosphite, diphenyl isodecyl phosphite, phenyl diisodecyl phosphite, and trionyl phenyl phosphite. It may be at least one or more selected from.

In the case of the UV stabilizer, at least one selected from benzotriazole-based, oxanilide-based, and hindered amine-based light stabilizers (HALS) may be included. In particular, the HALS is a representative material of a radical scavenger that catches radicals, and is used to compensate by treating polymer radicals, etc., which are caused by the inability to block 100% UV despite the use of a UV blocker. Mainly, it provides the effect of preventing loss of gloss and yellowing.

According to an embodiment of the present invention, the antioxidant prevents oxidation of polyethylene yarn for artificial turf, and types of antioxidants include primary antioxidants and secondary antioxidants. As the primary antioxidant, hindered phenol and lactone are used, and as the secondary antioxidant, phosphite and thioester are used. The role of the primary antioxidant is a radical scavenger, and the hindered phenol system treats oxygen centered radicals. Secondary antioxidants act as hydroperoxide (ROOH) decomposers. Antioxidants increase the synergistic effect by using both primary and secondary antioxidants in most resins, so hindered phenol-based, lactone-based and phosphorus-based are mixed in an appropriate ratio. Is being used. Phenol-based 2,6-di-t-Butyl-4-methylphenol, 2,2-Methylenebis (4-methyl-6-t-butylphenol) can be provided, and in the case of phosphorus, Bis (2,4-di -t-butyl), Tris(2,4-di-t-butylphenyl)-phosphite, etc. may be provided. In the case of an antioxidant, it may contain 0.1 to 5 parts by weight based on 100 parts by weight of the polyethylene resin.

According to an embodiment of the present invention, the filler improves physical properties such as tensile elongation and gloss of the final product, and provides an impact reinforcing effect. As the filler, an acrylic rubber commonly used in resin may be provided, and may include 1 to 20 parts by weight based on 100 parts by weight of the polyethylene resin.

According to an embodiment of the present invention, the colorant is for imparting aesthetics to the polyethylene yarn for artificial turf, and as the colorant, a pigment or a dye may be used, and preferably a pigment may be provided. It may contain 1 to 10 parts by weight based on 100 parts by weight of the polyethylene resin.

According to an embodiment of the present invention, a film including the composition may be provided. The film may be provided as a blown film, for example, as a slit film that can be provided as a yarn, but is not limited thereto.

On the other hand, including the composition, the manufacturing method for the artificial turf yarn is as follows.

According to an embodiment of the present invention, (a-1) a first metallocene polyethylene resin including 1 to 15 parts by weight of a _{C 6 comonomer based on 100 parts by weight of an ethylene monomer, under a first metallocene catalyst.} Polymerizing with; (b-1) gas phase polymerization of a second metallocene polyethylene resin under a second metallocene catalyst, including 1 to 20 parts by weight of a _{C 6} comonomer based on 100 parts by weight of an ethylene monomer; (c-1) preparing a mixed resin by mixing 10 to 50 parts by weight of the second metallocene polyethylene resin with respect to 50 to 90 parts by weight of the first metallocene polyethylene resin; And (d-1) extruding the mixed resin; artificial turf yarn manufacturing method comprising a.

According to another embodiment of the present invention, (a-2) a first metallocene polyethylene resin containing 1 to 15 parts by weight of a _{C 6 comonomer based on 100 parts by weight of an ethylene monomer, under a first metallocene catalyst.} Polymerizing with; (b-2) ethylene monomer based on 100 parts by weight, the resin including a C ₃ of comonomers from 10 to 20 parts by weight and C ₄ of the comonomer to 1 part to 10 parts by weight, Ziegler-under Natta catalyst Ziegler-Natta polyethylene Polymerizing with a resin; (c-2) preparing a mixed resin by mixing 10 to 30 parts by weight of the Ziegler-Natta polyethylene resin with respect to 70 to 90 parts by weight of the first metallocene polyethylene resin; And (d-2) extruding the mixed resin; artificial turf yarn manufacturing method comprising a.

In the step (b-2), the C ₃ comonomer is prepolymerized by a slurry loop, and the C ₄ comonomer is polymerized by gas spherilene.

In one embodiment of the LLDPE manufacturing process by the slurry loop, polymerization is carried out at 110° C. and 4.2 MPa by using isobutane as a diluent in a loop reactor using a _{C 3 co-monomer.} The reactor effluent is depressurized to separate from isobutane. The required heat is supplied by mixing the heated isobutane vapor with the reaction effluent, and the obtained polymer can be made into pellets and provided.

In addition, the C ₄ co-monomer may be polymerized by gas spherilene, and a gas vapor phase process for producing LLDPE, etc. may be provided by the Basel Corporation process method.

The density of the first metallocene polyethylene resin of (a-1) and (a-2) is 0.910 to 0.920, and the melt index (MI) may be provided in 0.5 to 5 g/10min at 2.16Kg at 190°C. . It is preferably provided at 0.5 to 2 g/10min.

The density of the second metallocene polyethylene resin of (b-1) may be 0.910 to 0.920, and a melt index (MI) may be provided in 0.5 to 5 g/10min at 2.16Kg at 190°C. It is preferably provided at 1 to 5 g/10 min.

The density of the Ziegler-Natta polyethylene resin of (b-2) is 0.900 to 0.920, and the melt index (MI) is provided in 0.5 to 5 g/10min at 2.16Kg at 190°C. It is preferably provided at 1 to 3 g/10min.

The above density is measured by ASTM D1505, and the melt index (MI) is measured by ASTM D1238. In addition, the same contents as the above-described resin composition may be applied, and description thereof will be omitted within the overlapping range.

Hereinafter, the configuration and operation of the present invention will be described in more detail through preferred embodiments of the present invention. However, this has been presented as a preferred example of the present invention and cannot be construed as limiting the present invention in any sense.

Contents not described herein can be sufficiently technically inferred by those skilled in this technical field, and thus description thereof will be omitted.

Example 1

First metallocene polyethylene resin (M2010EN: MI = 1.0, Density = 0.918, Comonomer = C _{6 Based on} 100 parts by weight of the first metallocene PE resin 7 to 10 parts by weight) based on 90 parts by weight of the second metallocene polyethylene resin (M1835HN: MI = 3.5, Density = 0.916, Comonomer = C ₆ ) based on 100 parts by weight of the first metallocene PE resin Including 8 to 11 parts by weight) 10 parts by weight were mixed to prepare a polyethylene mixed resin using artificial turf yarn.

Example 1-1

The mixed resin of Example 1 was extruded into a blown film. Extrusion conditions are provided in 40mm Φ screw, 75mm Φdie, 2mm die gap, the speed of the srew is 60rpm, the blow-up ratio (BUR) is 2. In addition, the values of the barrel and the extrusion die are shown in [Table 1].

The thickness of the finally produced film is provided as 50㎛. The tensile strength of the film was measured by ASTM D882, the tensile elongation according to ASTM D882, and the Elmendorf tear strength by ASTM D1922. The results for tensile strength, tensile elongation and tear strength are shown in Table 2.

B1 B2 B3 D1 D2 170 175 180 180 185

(B=barrel, D=extrusion die)

Example 1-2

The MI (Melt Indexer), MFR (Melt flow rate), and density of the mixed resin of Example 1 were measured, and the result values are shown in Table 2. MI and MFR were measured by ASTM D1238 and density by ASTM D1505.

Example 2

Prepared in the same manner as in Example 1, except that 70 parts by weight of the first metallocene polyethylene resin and 30 parts by weight of the second metallocene polyethylene resin were included, and in the same manner as in Examples 1-1 and 1-2 Physical properties were measured.

Example 3

Except that 50 parts by weight of the first metallocene polyethylene resin and 50 parts by weight of the second metallocene polyethylene resin were prepared in the same manner as in Example 1, and in the same manner as in Examples 1-1 and 1-2 Physical properties were measured.

Example 4

First metallocene polyethylene resin (M2010EN: MI = 1.0, Density = 0.918, Comonomer = C _{6 Based on} 100 parts by weight of the first metallocene PE resin 7 to 10 parts by weight) Based on 90 parts by weight, Ziegler-Natta polyethylene resin (3325 W: MI = 2.0, Density = 0.911, Comonomer = C _{3 Based on} 100 parts by weight of ZN PE resin, Comonomer = C ₃ 13 to 16 weight Parts, Comonomer = C ₆ 4 to 9 parts by weight included) 10 parts by weight were mixed to prepare a polyethylene mixed resin for artificial turf yarn. Others were prepared in the same manner as in Example 1, and physical properties were measured in the same manner as in Examples 1-1 and 1-2.

Example 5

Preparation and physical properties were measured in the same manner as in Example 4, except that 70 parts by weight of the first metallocene polyethylene resin and 30 parts by weight of the Ziegler-Natta polyethylene resin were included.

Example 6

Preparation and physical properties were measured in the same manner as in Example 4, except that 50 parts by weight of the first metallocene polyethylene resin and 50 parts by weight of the Ziegler-Natta polyethylene resin were included.

Comparative Example 1

The physical properties were measured in the same manner as in Examples 1-1 and 1-2 of a polyethylene resin for artificial turf yarn commercially available by Kolon Glotech.

Comparative Example 2

First metallocene polyethylene resin (M2010EN: MI = 1.0, Density = 0.918, Comonomer = C _{6 Based on} 100 parts by weight of the first metallocene PE resin Including 7 to 10 parts by weight) To provide a polyethylene resin for artificial turf yarn containing 100 parts by weight, physical properties were measured in the same manner as in Examples 1-1 and 1-2.

division unit Comparative Example 1 Comparative Example 2 Example 1 Example 2 Example 3 MI _2.16 g/10min 1.1 1.0 1.2 1.6 2.0 MI _21.6 g/10min 30.1 32.7 35.9 40.5 45.1 MFR MI _21.6 /MI _2.16 27.5 32.1 29.4 25.3 22.3 density g/cm ³ 0.930 0.918 0.918 0.917 0.917 Tensile strength MD kgf/cm ² 390 410 470 450 480 Tensile strength TD kgf/cm ² 370 410 490 450 440 Tensile elongation MD % 650 540 610 620 650 Tensile elongation TD % 800 710 750 730 710 Tear strength MD gf - 480 330 540 530 Tear strength MD gf - 720 670 730 740

Referring to Table 2, in the case of Examples 1 to 3 according to the present invention, the density was significantly reduced compared to Comparative Example 1. It was confirmed that the touch feeling can be improved in light of the point that this means that the touch feeling is improved.

In addition, in Examples 1 to 3, with respect to Comparative Examples 1 and 2, the tensile strength value was remarkably improved, and it was confirmed that the tensile elongation and tear strength were remarkably improved compared to Comparative Example 2.

Therefore, it can be seen that by blending the first metallocene polyethylene resin and the second metallocene polyethylene according to the present invention within the range of Table 2, it is possible to improve abrasion and resilience, and to improve touch and tear, and tensile strength. .

division unit Comparative Example 1 Comparative Example 2 Example 4 Example 5 Example 6 MI _2.16 g/10min 1.1 1.0 1.1 1.3 1.5 MI _21.6 g/10min 30.1 32.7 35.9 40.1 45.6 MFR MI _21.6 /MI _2.16 27.5 32.1 31.5 30.8 30.6 density g/cm ³ 0.930 0.918 0.916 0.915 0.913 Tensile strength MD kgf/cm ² 390 410 460 440 390 Tensile strength TD kgf/cm ² 370 410 480 430 360 Tensile elongation MD % 650 540 630 630 620 Tensile elongation TD % 800 710 770 800 760 Tear strength MD gf - 480 480 570 520 Tear strength MD gf - 720 760 750 680

Looking at Table 3, in the case of Examples 4 to 6 according to the present invention, the density was significantly reduced compared to Comparative Example 1. It was confirmed that the touch feeling can be improved in light of the point that this means that the touch feeling is improved.

In addition, in Examples 4 to 6, with respect to Comparative Examples 1 and 2, the tensile strength value was remarkably improved, and it was confirmed that the tensile elongation and tear strength were remarkably improved compared to Comparative Example 2.

Therefore, it can be seen that by blending the first metallocene polyethylene resin and Ziegler-Natta polyethylene according to the present invention, it is possible to improve abrasion and resilience, and to improve touch and tear, and tensile strength. In particular, by blending the Ziegler-Natta polyethylene resin in the range of Table 3, including 10 to 30 parts by weight, it can be seen that the Ziegler-Natta physical properties can be improved.

In the above, the present invention has been described by specific matters such as specific elements and limited embodiments, but this is provided only to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments, and the present invention Anyone with ordinary knowledge in the technical field to which the invention pertains can make various modifications and variations from these descriptions.

Therefore, the spirit of the present invention is limited to the above-described embodiments and should not be defined, and all modifications that are equally or equivalent to the claims as well as the claims to be described later fall within the scope of the spirit of the present invention. I would say.

Claims (19)

Based on 100 parts by weight of the first metallocene polyethylene resin polymerized under the first metallocene catalyst,
A polyethylene resin composition for use of artificial turf, comprising 10 to 50 parts by weight of any one selected from a second metallocene polyethylene resin polymerized under a second metallocene catalyst or a Ziegler-Natta polyethylene resin polymerized under a Ziegler-Natta catalyst. The method of claim 1,
The polyethylene resin composition for artificial turf yarn, characterized in that the polyethylene is linear low-density polyethylene (LLDPE). The method of claim 1,
The first metallocene polyethylene resin and the second metallocene polyethylene resin have a density of 0.910 to 0.920, and a melt index (MI) of 0.5 to 5g/10min at 2.16Kg at 190°C. Polyethylene resin composition for use of artificial turf yarn. The method of claim 1,
The first metallocene polyethylene resin is a polyethylene resin composition for use of artificial turf, characterized in that polymerized by including 1 to 15 parts by weight of a _{C 6} comonomer based on 100 parts by weight of the monomer ethylene. The method of claim 1,
The second metallocene polyethylene resin is a polyethylene resin composition for artificial turf yarn, characterized in that polymerized by including 1 to 20 parts by weight of a _{C 6} comonomer based on 100 parts by weight of monomer ethylene. The method of claim 1,
The Ziegler-Natta polyethylene resin has a density of 0.900 to 0.920, and a melt index (MI) of 0.5 to 5 g/10min at 2.16Kg at 190°C. A polyethylene resin composition using artificial turf yarn. The method of claim 1,
The Ziegler-Natta polyethylene resin is a monomer of ethylene with respect to 100 parts by weight, and C ₃ of comonomers from 10 to 20 parts by weight, the artificial turf source used characterized in that the polymerization, including C ₄ of the comonomer to 1 part to 10 parts by weight Polyethylene resin composition. The method of claim 1,
The first metallocene catalyst is a polyethylene resin composition for artificial turf raw material represented by the following formula (1).
[Formula 1]

The method of claim 1,
The second metallocene catalyst is a polyethylene resin composition for artificial turf raw material represented by the following formula (2).
[Formula 2]

The method of claim 1,
The Ziegler-Natta catalyst is a Ziegler-Natta catalyst in _{which TiCl 4 is supported on an MgCl 2} support, which is a polyethylene resin composition using artificial turf yarn. The method of claim 1,
The polyethylene resin composition for artificial turf yarn is a polyethylene resin composition for artificial turf yarn comprising at least one or more selected from stabilizers, antioxidants, fillers, flame retardants and colorants. Artificial turf yarn comprising the composition of any one of claims 1 to 11. (a-1) polymerizing a first metallocene polyethylene resin under a first metallocene catalyst, including 1 to 15 parts by weight of a _{C 6} comonomer based on 100 parts by weight of an ethylene monomer;
(b-1) gas phase polymerization of a second metallocene polyethylene resin under a second metallocene catalyst, including 1 to 20 parts by weight of a _{C 6} comonomer based on 100 parts by weight of an ethylene monomer;
(c-1) preparing a mixed resin by mixing 10 to 50 parts by weight of the second metallocene polyethylene resin with respect to 50 to 90 parts by weight of the first metallocene polyethylene resin; And
(d-1) extruding the mixed resin; artificial turf yarn manufacturing method comprising a. (a-2) polymerizing a first metallocene polyethylene resin under a first metallocene catalyst, including 1 to 15 parts by weight of a _{C 6} comonomer based on 100 parts by weight of an ethylene monomer;
(b-2) ethylene monomer based on 100 parts by weight, the resin including a C ₃ of comonomers from 10 to 20 parts by weight and C ₄ of the comonomer to 1 part to 10 parts by weight, Ziegler-under Natta catalyst Ziegler-Natta polyethylene Polymerizing with a resin;
(c-2) preparing a mixed resin by mixing 10 to 30 parts by weight of the Ziegler-Natta polyethylene resin with respect to 70 to 90 parts by weight of the first metallocene polyethylene resin; And
(d-2) extruding the mixed resin; artificial turf yarn manufacturing method comprising a. The method of claim 13 or 14,
The polyethylene is an artificial turf yarn manufacturing method, characterized in that the linear low density polyethylene (LLDPE). The method of claim 13 or 14,
The first metallocene polyethylene resin has a density of 0.910 to 0.920 and a melt index (MI) of 0.5 to 5 g/10 min at 2.16 Kg at 190°C. The method of claim 13,
The second metallocene polyethylene resin has a density of 0.910 to 0.920 and a melt index (MI) of 0.5 to 5 g/10 min at 2.16 Kg at 190°C. The method of claim 14,
The Ziegler-Natta polyethylene resin has a density of 0.900 to 0.920 and a melt index (MI) of 0.5 to 5 g/10 min at 2.16 Kg at 190°C. The method of claim 14,
In the step (b-2), the C ₃ comonomer is prepolymerized by a slurry loop, and the C ₄ comonomer is polymerized by gas spherilene.

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