JPH0248487Y2 - - Google Patents

Description

[Detailed explanation of the idea]

Technical Field The present invention relates to artificial turf that prevents troubles caused by static electricity. Background Art Artificial turf has an appearance and feel similar to natural turf, and has advantages such as superior durability, ease of laying, all-weather usability, and practicality with low maintenance costs.
Tennis courts, football fields, golf practice ranges,
It is beginning to be widely used in sports fields such as soccer fields. Artificial grass used for these purposes is
Generally, it has a structure in which threads or filaments made of synthetic fibers are attached to the artificial turf base fabric in a cut pile shape by tufting, and the pile threads have abrasion resistance,
Polyamide,
polypropylene, polyester, polyacrylic,
Synthetic resin fibers such as polyvinylidene chloride and polyvinyl chloride have been used, and reasonably satisfactory results have been obtained. However, the synthetic resins that make up these pile yarns are all dielectric materials,
The disadvantage is that static electricity is generated due to friction and its damping properties are poor. In other words, when artificial turf with pile threads made of these synthetic resins is used, static electricity generated by friction with clothing or shoes during use accumulates and is discharged through metal bats, goal posts, and other conductors. In addition to giving an electric shock to competitors who come into contact with it, it also causes electrostatic damage that can cause combustible materials to catch fire indoors. Generally, in order to prevent static electricity damage in synthetic resin products, antistatic agents are applied or mixed into the products. However, since the pile yarns that make up artificial turf are strongly rubbed by shoes and the like, it is almost impossible to permanently prevent static electricity damage by ordinary antistatic agent treatment. It is also used in general synthetic fibers. Adding hygroscopic properties is not only uneconomical, but also has the drawback of impairing the strength and drainage properties of the artificial turf. Summary of the invention In view of the above-mentioned circumstances, the purpose of the invention is to provide a simple artificial turf structure that satisfies basic properties such as mechanical properties and weather resistance while preventing static electricity damage, which was a problem. There is a particular thing. According to the inventor's research, polyamide-based synthetic fibers, polypropylene-based synthetic fibers, and polyvinylidene chloride-based fibers, each of which has excellent basic properties as an artificial turf material such as mechanical properties and weather resistance, were used at specific surface area ratios. When pile yarns are formed by doubling yarns in such a way, frictional charging is less likely to occur, the generated static electricity is well damped, and it also has a favorable texture, which is extremely effective for achieving the above objectives. It was found that That is, the artificial turf of the present invention consists of polyamide-based synthetic fibers that provide a surface area of 27% to 80%, polypropylene-based synthetic fibers that provide a surface area of 10% to 60%, and 7% to 60% surface area.
% polyvinylidene chloride synthetic fibers are combined to make a total of 100% of the yarn, which is attached to the base fabric for artificial turf in the form of a cut pile. It is. The usable range of the polyamide synthetic fiber, polypropylene synthetic fiber, and vinylidene chloride synthetic fiber of the present invention is shown as a shaded area in FIG. The combination of these three types of fibers satisfies the properties required for artificial turf, such as mechanical properties such as abrasion resistance, compression fatigue resistance, and tear and crack resistance, as well as weather resistance, texture, and appropriate weight. However, especially electrically, the positive chargeability of polyamide fibers is canceled out by the slight negative chargeability of polypropylene fibers and the negative chargeability of polyvinylidene chloride fibers, making it difficult for frictional charging to occur. It is presumed that this improves the attenuation of generated static electricity. Detailed Description of the Invention FIG. 1 is a schematic partial cross-sectional view in the thickness direction of an artificial turf according to an embodiment of the invention. That is, this artificial turf is made of, for example, an artificial turf base fabric 1 made of polyester warp yarns 1a and weft yarns 1b, polyamide synthetic fibers 2a (shown by solid lines), polypropylene synthetic fibers 2b (dashed lines) and chloride. A cut pile yarn 2 made of a yarn doubled with a vinylidene resin synthetic fiber 2c (indicated by a dotted line) is attached and lined with a backing material 3 made of synthetic rubber, synthetic resin, or the like. Examples of the polyamide synthetic fiber 2a include 6-nylon, 6,6-nylon, 610-nylon, and 12-nylon.
It is preferably made of nylon or a mixture thereof, and has a single filament denier of 100 to 1000 deniers. The polypropylene synthetic fiber 2b is made of a propylene homopolymer or a random or block copolymer of ethylene, 1-butene, butadiene, etc., containing 90% by weight or more of propylene, and has a single fiber denier.
Those in the range of 100 to 1000 deniers are preferably used. In addition, as the vinylidene chloride-based synthetic fiber 2c, polyvinylidene chloride, vinyl chloride-vinylidene chloride copolymer in which vinylidene chloride has a weight ratio of 75 to 95%, acrylic acid ester-vinylidene chloride copolymer, vinyl chloride-methacrylic acid It is preferably made of a vinylidene chloride copolymer such as an ester-vinylidene chloride copolymer and has a single filament denier of 100 to 1000 deniers. Polyamide synthetic fiber 2a, polypropylene synthetic fiber 2b, and vinylidene chloride synthetic fiber 2
The cross-sectional shape of c may be circular, flat, or other irregular shapes, but for example, as shown in the cross-sectional shape in FIG. 2 by melt spinning, the ratio of the major axis L to the minor axis D is L/
Those having a flat circular cross section in which D is 2 to 10 are most preferably used. In the present invention, based on the results of the charging property test described below, the above-mentioned polyamide-based synthetic fiber 2
a, polypropylene synthetic fiber 2b and polyvinylidene synthetic fiber 2c, each with a surface area ratio of 27
~80%, 10-60% and 7-60% totaling 100
%. If the ratio of polyamide synthetic fibers is in excess of the above range, positive charging properties will become stronger during triboelectric charging. If the proportion of the polypropylene synthetic fiber is greater than the above range, it will become too hard and the attenuation of static electricity will deteriorate. On the other hand, if the ratio of vinylidene chloride-based synthetic fibers is greater than the above range, the negative chargeability will be strong. Furthermore, in either case, if the surface area is outside the range, the feel of the artificial grass will be poor. As mentioned above, the usable range according to the surface area ratio of the three types of fibers according to the present invention is shown as the shaded area in FIG. Polyamide synthetic fiber 2a, polypropylene synthetic fiber 2b, and vinylidene chloride synthetic fiber 2
c is doubled yarn, and it is necessary that there is close contact between these three parties, with the ratio of first twisting of the three parties being 60 to 160 times/m and final twisting of 100 to 200 times/m per pile length. It is more preferable that the fibers are in a twisted state.
These three yarns may be combined at the same time, but the yarn obtained by combining any two yarns may be combined with another third yarn, or two yarns of different types and/or ratios may be combined. You may further combine two or more types of doubling yarns to obtain a three-way doubling yarn. Further, each single yarn or double yarn can be used after being twisted and twisted as appropriate. Paired yarns of polyamide synthetic fibers, polypropylene synthetic fibers, and vinylidene chloride synthetic fibers have a pile length of 5 to 20 mm and a basis weight of 0.5 to 5.0 Kg/m ²
Artificial turf is obtained by attaching it to the base fabric 1 by tufting so as to form a cut pile 2, and then adhering the backing material 3. Next, the antistatic effect of the artificial turf of the present invention will be explained below based on experimental results. Example 1, Comparative Examples 1 to 3 Vinylidene chloride-vinyl chloride copolymer resin (copolymerization weight ratio 75-95/25-5, Kureha Chemical Industry Co., Ltd.)
A plasticizer, a stabilizer, a pigment, etc. were blended into a compound manufactured by the Company (manufactured by Kawasaki Co., Ltd.), and the mixture was melt-spun, extruded through a nozzle with a flat cross-section using an extruder, stretched, and wound into four bobbins each. The thickness of the single yarn was 500 and 750 deniers. The cross-sectional shape of these single yarns was a flat shape as shown in FIG. 2, and for example, for a 750 denier single yarn, L=0.50 to 0.55 mm and D=0.10 to 0.13 mm. Next, 6 nylon chips (relative viscosity 2.95, manufactured by Teijin Ltd.) were melt-spun in the same manner as the vinylidene chloride-vinyl chloride copolymer resin, and four and two 350-denier flat yarns were wound around bobbins, respectively. I took it. The cross-sectional shape was almost the same as that shown in FIG. Next, polypropylene lenticules (manufactured by Tonen Petrochemical Co., Ltd.) were melt-spun in the same manner as the vinylidene chloride-vinyl chloride copolymer resin, and four and two 260-denier flat yarns were wound around bobbins, respectively. The cross-sectional shape was almost the same as that shown in FIG. The following samples 1 to 3 and 5 were obtained by doubling each of the three types of vinylidene chloride synthetic fibers, polyamide synthetic fibers, and polypropylene synthetic fibers at the ratios listed in Table 1 below. In addition, for samples 1, 2, and 5, 12 single yarns were each divided into 6 single yarns, and each of these was 150 times/m.
The first twist is applied to the resulting two doubled yarns, and
It was obtained by twisting at a rate of 110 times/m.
In order to obtain Sample 3 according to the present invention, first, four vinylidene chloride synthetic fibers and two nylon 6 fibers were twisted together at 150 turns/m. Next, four vinylidene chloride-based synthetic fibers and two polypropylene-based synthetic fibers are similarly twisted together at 150 turns/m. This double-ply yarn was twisted at a rate of 110 times/m, and then used as a pile yarn. A hand-woven base fabric made of 2000 denier polyester with a fabric weight of about 450 g/m ² and 17 warps/inch and 18 wefts/inch was used, and the above-mentioned nylon-polypropylene-vinylidene chloride/vinyl chloride yarn was used for this. Pile length of doubling yarn is 12 mm, pile weight is approximately 2.3
An artificial grass weave was obtained by tufting to a weight of Kg/m ² . The base of the pile was fixed with an adhesive acrylic ester synthetic resin to create artificial turf. Example 2 Using the raw material yarn used in Example 1, four polyamide synthetic fiber yarns and two polypropylene synthetic fiber yarns were twisted at a rate of 150 times/m. Next, four vinylidene chloride-based synthetic fibers and two polyamide-based synthetic fibers are similarly twisted and combined. The resulting two types of doubling yarns were combined and twisted at a rate of 110 times/m to obtain doubling yarns (sample 4) consisting of polyamide synthetic fibers, polypropylene synthetic fibers, and vinylidene chloride synthetic fibers. Artificial turf was created in the same manner as in Example 1 using this doubled yarn as a pile yarn. As mentioned above, the pile yarn surfaces of artificial turf samples 1 to 5 obtained corresponding to sample yarns 1 to 5 were rubbed with leather at 30°C and 17% RH, respectively. The amount of static electricity generated and its change over time were measured using a static electricity meter. The schematic structure of each sample thread and the measurement results of the initial generated voltage are summarized in Table 1, and the measurement results of changes over time are summarized in FIG. The results in Table 1 show that the artificial turf according to the embodiment of the present invention has a low voltage generated due to friction.

[Table] Effects of the invention As can be seen from the results in Figure 3 and Table 1 above, according to the invention, polyamide synthetic fibers, polypropylene synthetic fibers, and vinylidene chloride synthetic fibers with a specific range of surface area ratios were produced. Artificial grass with pile yarns made of doubled yarns (Samples 3 and 4)
has low triboelectrification and good damping properties. Moreover, it has been confirmed that it has a good balance of mechanical properties such as abrasion resistance, compression fatigue resistance, and tearing and cracking resistance, appropriate hardness, and weather resistance. Therefore, according to the present invention, the most desirable texture can be maintained without impairing the mechanical properties required for artificial turf, and the triboelectric charging properties that have been a problem can be improved by using polyamide-based synthetic fibers and polypropylene-based synthetic fibers. A permanently improved artificial turf can be obtained without particularly increasing costs by using a double-pile yarn made of synthetic fibers based on vinylidene chloride.

[Brief explanation of drawings]

Fig. 1 is a partial schematic cross-sectional view in the thickness direction of an example of the artificial turf of the present invention, Fig. 2 is an example of the cross-sectional shape of flat single yarn, and Fig. 3 is the frictional electrostatic voltage of the example and comparative samples and its decay over time. The graph showing the characteristics, Figure 4, shows the usable range (shaded area) according to the surface ratio of polyamide synthetic fibers, polypropylene synthetic fibers, and vinylidene chloride synthetic fibers that can be used in the artificial turf of the present invention.
This is a graph showing. 1...Base fabric, 2...Cut pile yarn, (2a:
polyamide synthetic fiber, 2b: polypropylene synthetic fiber, 2c: vinylidene chloride synthetic fiber),
3...Bumping material.

Claims (1)

[Scope of utility model registration request] Polyamide-based synthetic fibers that provide a surface area of 27-80%, polypropylene-based synthetic fibers that provide a surface area of 10-60%, and polyvinylidene chloride-based synthetic fibers that provide a surface area of 7-60% make a total of 100%. Artificial turf is made by attaching the doubled yarn to the artificial turf base fabric in a cut pile shape.