JPH11158783A - Bulk yarn for artificial lawn and artificial lawn using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide artificial lawn that has excellent mechanical characteristics, particularly excellent elongation and elastic recovery with reduced alteration of its performance under humid conditions and shows excellent color development on dyeing. SOLUTION: The fiber that has propylene terephthalate as a main recurring units with an intrinsic viscosity of >=0.5 and has the strength of >=4.5 g/d and the elongation of >=15% at its breakage is used as the bulk yarn for artificial lawn. Thus, well-balanced artificial lawn can be provided that has excellent tensile strength properties, elongation and the recovery from bending deformation with reduced alteration in humid performance and excellent weather fastness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexural / extension fatigue method which is used widely in place of natural turf for poolside, baseball, golf, soccer fields and interior decoration, etc. The present invention relates to a yarn for artificial turf having excellent characteristics and very excellent coloring properties with a disperse dye, and an artificial turf using the same.

[0002]

2. Description of the Related Art In recent years, artificial turf has been widely used for poolside, baseball, golf, soccer fields, interior decoration and the like, instead of natural turf. Conventionally, as a raw material of the yarn used for such artificial turf, vinylidene chloride, nylon 6, polyethylene, polypropylene and the like have been generally used.

[0003] Among them, for example, vinylidene chloride is said to produce chlorine-based gas and dioxin when incinerated after disposal, although it has excellent properties required for turf yarn such as fatigue resistance, weather resistance and flame retardancy. , Environmental problems have been pointed out. On the other hand, olefin fibers such as polyethylene and polypropylene do not generate toxic gas during combustion, but have disadvantages in durability during repeated fatigue, weather resistance and flame retardancy. Also, although the durability of nylon fiber is very good, the problem is that its mechanical performance changes when dry and wet, and the characteristics as a lawn also change due to the absorption of water. There was a point.

[0004] As described above, an artificial product having a good balance of performances such as little deterioration in performance due to moisture absorption and water absorption, excellent fatigue resistance during repeated elongation and bending deformation, and excellent weather resistance. A lawn yarn and an artificial turf using the same have been required.

[0005]

As described above, in the present invention, there is little change in performance due to moisture absorption and water absorption, and a decrease in performance due to exposure to ultraviolet rays when used for a long period of time. Another object of the present invention is to provide an artificial turf raw yarn and an artificial turf using the same, which have excellent mechanical durability and excellent properties such as excellent weather resistance in a well-balanced manner.

[0006]

That is, the present invention comprises, as a main component, a polyester having an intrinsic viscosity of 0.5 or more and having propylene terephthalate as a main repeating unit.
A fibrous yarn for artificial turf characterized by having a strength of 5 g / d or more and a breaking elongation of 15% or more, and a polyester having an intrinsic viscosity of 0.5 or more in which a main portion of a surface layer is mainly composed of propylene terephthalate as a main repeating unit. And an artificial turf comprising an artificial turf yarn having a strength of 4.5 g / d or more and a breaking elongation of 15% or more. Hereinafter, the present invention will be described in detail.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The technical point of the present invention is to use polyester fibers having an intrinsic viscosity of 0.5 or more and having propylene terephthalate as a main repeating unit as a main component material of the artificial turf yarn constituting the surface of the artificial turf. To use. By using a polyester-based fiber as the main skeleton, it is possible to basically suppress moisture absorption and water absorption and suppress long-term deterioration accelerated by them. Furthermore, compared to polyamides, their use is also economical,
Since it is basically a polyester, it has an advantage that resources can be easily recovered and no toxic gas is generated even during incineration.

It is important that the polyester used in the present invention is a polyester containing terephthalic acid as a main acid component and trimethylene glycol as a main glycol component. Since the glycol component is trimethylene glycol, the artificial turf yarn composed of polyester having this as the main skeleton maintains good properties such as polyester hydrophobicity and is composed of polyamide fiber. It has extremely excellent flex fatigue and elongation recovery properties equal to or higher than that of the artificial yarn for artificial turf, and the artificial turf using the same has a good balance of various performances.

More specifically, the polyester in the present invention is directed to a polyester containing terephthalic acid as a main acid component and trimethylene glycol as a main glycol component. Further, a polyester in which a part of the terephthalic acid component is replaced by another difunctional carboxylic acid component may be used, and / or a part of the glycol component is replaced by the above glycol or other diol component other than the main component. It may be polyester. Examples of the bifunctional carboxylic acid other than terephthalic acid used herein include, for example, isophthalic acid, naphthalenedicarboxylic acid, diphenyldicarboxylic acid, diphenoxyethanedicarboxylic acid, β-hydroxyethoxybenzoic acid, p-oxybenzoic acid, adipic acid And aromatic, aliphatic and alicyclic bifunctional carboxylic acids such as, sebacic acid and 1,4-cyclohexanedicarboxylic acid. Further, as the diol component other than the above glycol, for example, ethylene glycol, tetramethylene glycol, cyclohexane-
Examples thereof include aliphatic, alicyclic and aromatic diol compounds such as 1,4-dimethanol, neopentyl glycol, bisphenol A and bisphenol S, and polyoxyalkylene glycol. Further, as long as the polyester is substantially linear, a polycarboxylic acid such as trimellitic acid and pyromellitic acid, a polyol such as glycerin, trimethylolpropane, and pentaerythritol, 5-hydroxyisophthalic acid, and 3,5-dihydroxybenzoate Monomers having three or more functional ester-forming groups, such as acids, can be used. Further, a blend of the above-mentioned polymer or copolymer may be used.

In the present invention, the polyester fiber composed of the dicarboxylic acid component and the diol component is
A propylene terephthalate component having a content of not more than 50% of the whole cannot provide a material which is satisfactory in terms of flexural fatigue properties, elongation recovery and weather resistance. It is particularly preferred that 80 mol% or more of the repeating units are propylene terephthalate units.

The form of the fiber in the present invention may be a monofilament or a multifilament. In the case of the tufting process, it is usually preferable to use a product obtained by twisting multifilaments of about 500 denier in terms of performance such as appearance and durability. The cross-sectional shape of the yarn is not particularly limited, but is preferably an ellipse or a flat shape. In some cases, the shape may be a slit yarn obtained by cutting a film.

The artificial turf provided by the present invention is mainly composed of a polyester having a limiting viscosity of 0.5 or more whose main surface portion is propylene terephthalate as a main repeating unit and a strength of 4.5 g / d or more. It is characterized by being composed of a raw yarn for artificial turf having a breaking elongation of 15% or more, and the usage form of the raw yarn is not limited. Basically, the so-called tufted type artificial turf in which the above yarn forms a pile portion tufted to a woven or non-woven fabric such as polypropylene or polyester, or the original yarn for this artificial turf is cut into staples, and after laminating the web A so-called needle-punch type artificial turf which is needle-punched into a sheet shape may be used. In order to bring out the elastic recovery characteristics of the material, a tufted type is preferable.

Further, the artificial yarn for artificial turf may contain a small amount of any other polymer, antioxidant, antistatic agent, dye improver, dye,
Pigments, matting agents, optical brighteners, inert fine particles and other additives may be contained. In particular, when adding inert fine particles, any of the external precipitation method and the internal precipitation method can be adopted. In particular, in this application, which is premised on long-term outdoor use, it is preferable to incorporate a coloring agent such as a pigment and an ultraviolet absorber.

In order to obtain the high-strength fiber used in the present invention, the intrinsic viscosity of the polymer needs to be 0.5 or more. However, if a higher degree of polymerization is required, it is preferable to increase the degree of polymerization by performing solid phase polymerization under vacuum or in an inert gas atmosphere.

[0015]

[Function] By using the polyester material of the present invention, it has characteristics such as elastic recovery and bending characteristics as compared with the case of using a nylon or polyolefin material, and its performance is deteriorated due to moisture absorption and water absorption. The performance decrease is small even by light exposure. Furthermore, it is possible to provide an artificial turf raw yarn and an artificial turf using the same, which are well-balanced in various performances such as excellent weather resistance.

[0016]

EXAMPLES The present invention will now be described specifically with reference to examples, but the present invention is not limited to these examples. In addition, the evaluation method of various characteristics followed the following method.

Intrinsic viscosity: The polymer was dissolved in a phenol / tetrachloroethane = 1/1 mixed solvent and measured at 30 ° C.

Fineness: According to the definition of JIS-L-1013, 24 hours in a room where the temperature and humidity are controlled at 20 ° C. and 65% RH.
After standing for a time, the measurement was performed.

Strong elongation: 24 hours in a room where the temperature and humidity are controlled at 20 ° C. and 65% RH according to the definition of JIS-L1013.
After standing for a time, the tensile strength and elongation were measured by a tensile tester. In addition, the strength when wet is determined by placing the sample in water at room temperature.
After immersion for a period of time, moisture adhering to the surface was gently wiped off with gauze, and then measured by the same procedure.

Elastic recovery rate: It is based on the measuring method of elongation elastic modulus according to the definition of JIS-L1013.
% RH at room temperature for 24 hours, elongation 10% by a tensile tester at a yarn length of 20 cm and a pulling speed of 2 cm / min. Immediately after removing the weight and returning to the original gripping interval, immediately Pull at a pull rate of 2 cm / min. Elastic recovery rate (%) = (L-L1) / L × 100 L: Elongation at 10% elongation (mm, here 20 mm) L1: Residual strain (mm) after the first tension

Example 1 A polypropylene terephthalate having an intrinsic viscosity of 0.60 (P
After PT) resin was pre-dried at 80 ° C. for 4 hours at a vacuum of 0.1 mmHg, solid phase polymerization was carried out at 180 ° C. for 20 hours under the same vacuum conditions to obtain a PPT resin having an intrinsic viscosity of 0.85. After the solid-phase polymerization, the vacuum was broken with nitrogen gas, and the container was transferred to a container without touching the outside air. The obtained PPT resin was melt-mixed with a predetermined pigment and an ultraviolet absorber with a screw-type extruder adjusted to 270 ° C, and then melted at 275 ° C.
Spinning at 275 ° C. using a die having a rectangular nozzle adjusted to 20 ° C. and 0.3 m / s
And taken off at a spinning speed of 500 m / min and once wound up.

The undrawn yarn is preheated by a hot roller adjusted to 60 ° C., and then heated under steam at 120 ° C.
Stretched 2 times, 3% with hot roll set at 140 ° C
The yarn was heat-set at a relaxation rate of 520 denier to obtain a 6-filament yarn. The cross-sectional shape of the yarn was an elliptical flat shape with a ratio of the major axis to the minor axis of about 5.0. Table 1 shows the obtained drawn yarn characteristics. Little change in performance when wet,
A yarn for artificial turf having excellent elastic recovery was obtained.

Example 2 The original yarn obtained in Example 1 was twisted at a rate of Z250 times / m, and then twined to form a top twist. And Polyester 50
5/32 gauge, 9.5 steps using a tuft machine on a base fabric woven at a weaving density (warp: 31 yarns / inch, weft 29 yarns / inch) using 0 denier 96 filament yarn as the weft / Inch and a pile height of 8 mm were subjected to tufting. The tufted fabric thus obtained was backed with a backing agent mainly composed of natural rubber, and both ears were cut to finish artificial turf. There was no problem in the appearance and shape, and a novel artificial turf with excellent fatigue resistance and weather resistance, which was not found in the past, and little change in performance and touch even when dry and wet was obtained.

Comparative Example 1 Table 1 shows the characteristics of a commercially available raw yarn for artificial turf made of nylon 6 for comparison.

[0025]

[Table 1]

[0026]

By using the polyester material of the present invention, compared to the case of using nylon or polyolefin material, the polyester material has characteristics such as elastic recovery property and flexing property, and its performance is deteriorated due to moisture absorption, water absorption, etc. A lawn with well-balanced performance that uses a disperse dye with excellent color developability, can be dyed at normal pressure, and has excellent weather resistance, etc., even when exposed to light outdoors. A raw yarn and an artificial turf using the same can be provided.

Claims (2)

[Claims] 1. A polyester comprising propylene terephthalate as a main repeating unit and having an intrinsic viscosity of 0.5 or more as a main component, and having a strength of 4.5 g / d or more and 15%
A yarn for artificial turf having the above breaking elongation. 2. An artificial turf, characterized in that a main part of the surface layer is constituted by the yarn for artificial turf according to claim 1.