JP2981792B2 - White yarn for artificial grass - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a white yarn for artificial grass, which is used as a part of a white line, a mark or a picture in an artificial grass.

[0002]

2. Description of the Related Art Conventionally, artificial grass turf yarns are yarns having a flat cross section mainly made of a desired green-colored polyamide resin, and the yarns are planted on a base fabric by an appropriate method. It has been put to practical use.

[0003] By the way, as artificial turf has become widespread in the sports field and the like in recent years, for example, a white line line portion of an artificial turf used in a stadium, a mark or a pattern of an artificial turf used in an amusement park, etc. The white raw yarn colored white is planted.

[0004] As a white pigment for coloring the white yarn for artificial turf, a titanium pigment excellent in whiteness, particularly titanium dioxide, has been generally used.

However, the conventional white yarn for artificial turf made of a polyamide resin using titanium dioxide as a white pigment has excellent whiteness, but is inferior in weather resistance. In artificial grass with flocked, compared to other green colored parts,
There was a problem that the deterioration speed of the white portion was high.

That is, the degraded white portion of the artificial grass is dropped off the pile and a step is formed in this portion. For example, in an artificial grass laid on a ball game court, the rolling or bounce of the ball becomes irregular and an accident occurs. In particular, artificial turf laid in a stadium where mental characteristics such as speed competition are strongly required is a fatal defect. Furthermore, when the white yarn laid as a mark or a pattern on the artificial grass falls off, the appearance of the design is reduced, and the original role is not fulfilled.

Therefore, in order to improve the above-mentioned drawbacks, it has been studied to add a weathering agent to a white yarn for artificial turf together with a titanium-based white pigment. As the weathering agent, copper iodide is used. It was said that the effect of a copper-based weathering agent such as the above was most excellent.

However, when a large amount of a copper-based weathering agent is added to a white yarn for artificial turf made of a polyamide-based resin containing a titanium-based pigment in order to improve the weather resistance, the white yarn for artificial turf is required. Discoloration of the yarn is caused, and particularly in the wet heat setting step for imparting the crimpability and curl properties required for the artificial grass yarn, the tendency of discoloration to brown is remarkable. Had limitations.

Therefore, it is still difficult for the above-mentioned conventional white yarn for artificial turf to satisfy both whiteness and weather resistance to a high degree.

[0010]

SUMMARY OF THE INVENTION The present invention has been achieved as a result of studying to solve the above-mentioned problems of the conventional white yarn for artificial turf.

Accordingly, an object of the present invention is to provide a white raw yarn for artificial turf, which is excellent in balance of whiteness and weather resistance and which can provide an excellent artificial turf without a pile falling off in a white portion.

[0012]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, have used a specific inorganic white pigment other than titanium as a white pigment and further added a copper-based weathering agent. The white yarn for artificial turf made of polyamide resin contained shows excellent weather resistance even if the addition amount of the copper weathering agent is smaller than before, and it does not turn brown in the wet heat setting process, The inventors have found that excellent whiteness is maintained, and have reached the present invention.

That is, the present invention provides a yarn comprising a polyamide resin having a single yarn fineness of 100 to 700 d and a substantially flat cross section, wherein the polyamide resin comprises:
1.0 to 1 at least one white pigment selected from calcium, zinc, barium and magnesium
0.06% by weight, 0.006 to
It is intended to provide a white yarn for artificial turf characterized by containing 0.07% by weight.

[0014] The white yarn for artificial turf according to the present invention is characterized in that the polyamide-based resin further contains an amine-based antioxidant in an amount of 0.05 to less.
By containing 0.3% by weight, the white pigment, the copper-based light stabilizer and the amine-based antioxidant act synergistically to improve the whiteness and weather resistance to further excellent levels.

The polyamide resin forming the white yarn for artificial turf of the present invention includes nylon 6, nylon 66, and the like.
Nylon 12 or a copolymer thereof may be mentioned, and among them, nylon 6 and nylon 66 are preferably used.

The white pigments used in the present invention include calcium white pigments such as calcium carbonate and gypsum; zinc white pigments such as zinc oxide and zinc carbonate; barium sulfate;
Barium-based white pigments such as barium titanate, and magnesium-based white pigments such as talc and magnesium carbonate.These whiteness degrees are slightly inferior to those of titanium-based white pigments conventionally used, but are described below. When used in combination with a copper-based weathering agent and further with an amine-based antioxidant, it exhibits the same degree of whiteness as the titanium-based pigment.

The amount of the white pigment to be added to the polyamide resin is 1.0 to 10.0% by weight, preferably 2.0 to 10.0% by weight.
The range of 5.0% by weight is preferred. If it is less than 1.0% by weight, the whiteness of the yarn is low, and if it exceeds 10.0% by weight, the drawability at the time of spinning is reduced, and problems such as yarn breakage are caused. Or, it is not preferable because the strength of the yarn is reduced.

Examples of the copper-based weathering agent used in the present invention include copper iodide, cuprous chloride, cupric chloride, copper bromide, copper stearate, copper pyrophosphate and the like. It is preferably used.

The amount of the copper-based weathering agent to be added to the polyamide resin is preferably in the range of 0.006 to 0.07% by weight, particularly 0.015 to 0.035% by weight, in terms of copper. If the amount is less than 0.006% by weight, the effect of improving the weather resistance is insufficient, and if it exceeds 0.07% by weight, adverse effects such as discoloration occur, which is not preferable.

In a conventional white yarn for artificial turf to which a titanium-based white pigment is added, a copper-based weathering agent is usually added in an amount of 0.03% by weight or more in terms of copper in order to improve weather resistance. However, satisfactory weather resistance could not be obtained. On the other hand, in the present invention, by using the white pigment, sufficient weather resistance can be obtained even when the addition amount of the copper-based weathering agent is smaller than in the past, and further, the following amine-based antioxidant: When used together, it is possible to further reduce the amount of the copper-based weathering agent to be added, and to obtain an artificial turf yarn having excellent whiteness.

In the present invention, as an additive to the polyamide resin, it is preferable to use an amine antioxidant in addition to the white pigment and the copper weathering agent.

The amine antioxidants used in the present invention include 2-mercaptobenzimidazole, diphenylamine, diphenylamine-ketone condensate, N, N'-di-
β-naphthyl-ρ-phenylenediamine and N, N′-
Examples thereof include phenylcyclohexyl-ρ-phenylenediamine, and among them, 2-mercaptobenzimidazole is preferably used.

The amount of the amine antioxidant added to the polyamide resin is preferably in the range of 0.05 to 0.3% by weight, more preferably 0.1 to 0.2% by weight, and if it is less than 0.05% by weight. If the effect of improving the weather resistance is insufficient, and if it exceeds 0.3% by weight, not only the effect of improving the weather resistance further cannot be obtained, but also adverse effects such as a decrease in the strength of the yarn are not preferred.

In the present invention, by blending this amine antioxidant with the above-mentioned white pigment and copper-based weathering agent in a polyamide-based resin, a white yarn for artificial turf having more excellent whiteness and weatherability is obtained. be able to.

The white yarn for artificial turf of the present invention is a yarn having a single fiber fineness of 100 to 700 d and a turfgrass-like substantially flat cross section, and comprises the white pigment, copper-based weathering agent and If necessary, a polyamide resin composition containing an amine antioxidant is melt-spun using a nozzle having a slit-shaped spinning hole, stretched and heat-treated if necessary, and then cut to a desired length. Method, and a film obtained by extrusion molding the polyamide-based resin composition, is cut in the longitudinal direction to form a tape, or, if necessary, further form a longitudinal slit in the tape-like material And a splitting method.

The white yarn for artificial turf of the present invention thus obtained is planted by a usual method on a white line forming portion or a portion of a mark or a pattern of the artificial turf base fabric, and the white color of the artificial turf is obtained. It is used to form a part. The white part of the artificial turf planted in this way has high whiteness, excellent weather resistance, and does not fall off the pile even after long-term use.

The structure and effect of the white yarn for artificial turf of the present invention will be further described below with reference to examples.

[0028]

EXAMPLE Nylon 6 (N6) or Nylon 66 (N
66), a composition prepared by blending the white pigment shown in Table 1, copper iodide as a weathering agent, and 2-mercaptobenzimidazole as an antioxidant in the amounts shown in Table 1 respectively, was added to each of the extruders. It is melted by supplying it to a ruder and melt-spun a flat cross-section yarn using a nozzle having a slit-shaped spinning hole with a width of 0.2 mm and a length of 3.0 mm, which is cooled and solidified in cold water, and then drawn. By heat treatment, various types of white yarns for artificial grass were obtained.

For each of the obtained white yarns for artificial grass,
Table 1 also shows the results of evaluation of whiteness, weather resistance and strength by the following methods.

Whiteness: Shown by Lab-based whiteness measured by a SM-3 color computer manufactured by Suga Test Instruments Co., Ltd. (the higher the numerical value, the better the whiteness).

Weather resistance: measured by a sunshine super long life weatherometer manufactured by Suga Test Instruments Co., Ltd.
The intensity retention (%) after irradiation for 00 hours was measured.

Strength: Measured in accordance with JIS L 1013.

The symbols of the white pigments in Table 1 mean the following.

A: calcium carbonate, B: barium sulfate, C: zinc oxide, D: talc, E: titanium dioxide.

[0035]

[Table 1]

As is clear from the results shown in Table 1, all the white raw yarns for artificial grass of the present invention have high whiteness and extremely excellent weather resistance.

[0037]

As described in detail above, the white yarn for artificial turf of the present invention can provide an artificial turf excellent in balance of whiteness and weather resistance, and without white piles falling off. It can be effectively used for white line portions of artificial grass and for portions where marks or patterns are partially formed.

──────────────────────────────────────────────────続 き Continuation of front page (51) Int.Cl. ⁶ identification code FI E01C 13/08 E01C 13/00 B (58) Investigated field (Int.Cl. ⁶ , DB name) D01F 6/90 301 D01F 6 / 60 321 E01C 13/08 D01F 1/04 D01F 1/10

Claims (2)

(57) [Claims] 1. A single yarn fineness of a polyamide resin is 1
100 to 700 d and a yarn having a substantially flat cross section, wherein the polyamide-based resin contains at least one white pigment selected from a calcium-based, zinc-based, barium-based, and magnesium-based resin at 1.0%. A white raw yarn for artificial turf, characterized in that the white raw yarn contains up to 10.0% by weight and 0.006 to 0.07% by weight of a copper-based weathering agent in terms of copper. 2. The artificial turf white yarn according to claim 1, wherein the polyamide resin further contains 0.05 to 0.3% by weight of an amine antioxidant.