JPH10130956A - Yarn for artificial lawn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the yarn for artificial lawn, having a low shrinkage percentage in hot water, a good dimensional stability and a slight incidence ratio of wale streaks and useful for a tennis court, etc., by composing the whole, etc., of the yarn for artificial lawn of a reinforced polyamide resin containing a swellable fluormica-based mineral uniformly dispersed therein. SOLUTION: This yarn for artificial lawn is obtained by composing the whole or a part of the yarn therefor of a reinforced polyamide resin (e.g. nylon 6) containing preferably 0.01-10wt.% swellable fluormica-based mineral, represented by, e.g. the formula, αMF.β(aMgF2 .bMgO).γSiO2 M is sodium or lithium; 0.1<=α<=2; 2<=β<=3.5; 3<=γ<=4; 0<=(a)<=1; 0<=(b)<=1; [(a)+(b)]=1} and uniformly dispersed therein.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yarn for artificial turf having a small shrinkage of hot water, good dimensional stability, and a low incidence of vertical streaks when formed into artificial turf.

[0002]

2. Description of the Related Art In recent years, artificial turf has been used for sports applications such as baseball fields, tennis courts, rugby fields, soccer fields, gateball fields, golf practice mats, poolside mats, public spaces such as schools and kindergartens, and homes. It is widely used in gardens and verandas. As the material, polyamide yarns such as nylon 6 and nylon 66 are generally used in many cases because of their excellent mechanical strength, gloss, feel, dyeability and the like.

[0003] However, artificial turf made of these polyamide yarns is inferior in dimensional or morphological stability when wet, and is also difficult to dry due to its high water content, and tends to be constantly wet, and has an unpleasant feel. At the same time, there is a problem that microorganisms are liable to be generated and become unsanitary.

[0004] In addition, since these artificial turf has a large variation in the crimp rate, for example, when a builder or a civil engineer constructs the artificial turf, a streak pattern due to uneven crimp is easily generated on the surface of the lawn. It was necessary to cut and remove that part.

[0005] Further, in the construction of artificial turf containing sand, there is a step of putting sand in the middle of the step. Generally, polyamide yarns are liable to be charged. . Therefore, usually, a step of spraying an aqueous solution containing an antistatic agent onto a polyamide-based artificial turf yarn, followed by heat drying at a temperature of 100 to 150 ° C is indispensable. However, since the wet heat treatment at this time causes heat shrinkage and causes uneven crimping, it becomes difficult for sand to enter uniformly,
A step of forcibly leveling with a comb-like rotating body was required, and the workability was poor.

Therefore, in order to solve the above problems, there is a demand for an artificial turf made of polyamide yarn having a small hot water shrinkage.
Japanese Patent Application Laid-Open Publication No. H11-216, 1988, proposes an artificial turf yarn composed of a polyamide composite in which a layered silicate represented by montmorillonite and savonite is uniformly dispersed, but in terms of variation in hot water shrinkage and crimp. It was not enough.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide an artificial turf yarn having a small shrinkage of hot water, good dimensional stability, and a low incidence of vertical streaks when formed into artificial turf. .

[0008]

Means for Solving the Problems The present inventors have made intensive studies to solve the above problems, and as a result, have found that a reinforced polyamide resin in which a specific swellable fluoromica-based mineral is uniformly dispersed is used for artificial turf. It has been found that this purpose can be achieved by using a yarn, and the present invention has been achieved.

That is, the present invention provides an artificial turf yarn characterized in that the swellable fluoromica-based mineral is uniformly dispersed in a reinforced polyamide resin and the whole or a part of the artificial turf yarn is constituted. It is assumed that.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.

The reinforced polyamide resin of the present invention is obtained by uniformly dispersing a swellable fluoromica-based mineral in a polyamide resin. Here, to be uniformly dispersed means that each of the swellable fluoromica-based minerals is in a state in which one by one, or a multilayer having an average overlap of 5 layers or less is parallel or randomly, or a mixture of parallel and random. , More than 50% of which
Preferably, it refers to a state in which 70% or more is dispersed without forming a lump. Specifically, wide-angle X-ray diffraction measurement is performed on the pellets of the reinforced polyamide resin, which can be confirmed by the disappearance of the peak due to the thickness direction of the swellable fluoromica-based mineral.

[0012] The polyamide resin means a melt-moldable polymer having an amide bond formed from an aminocarboxylic acid, a lactam or a diamine and a dicarboxylic acid.

Preferred examples of such polyamide resins include polycaproamide (nylon 6), polytetramethylene adipamide (nylon 46), polyhexamethylene adipamide (nylon 66), and polyhexamethylene sebacamide. (Nylon 610), polyhexamethylene dodecamide (nylon 612), polyundecamethylene adipamide (nylon 116), polyundecamide (nylon 11),
Polydodecamide (nylon 12), polybis (4-aminocyclohexyl) methane dodecamide, (nylon PACM1
2), polybis (3-methyl-4-aminocyclohexyl) methanedodecamide (nylon dimethyl PACM12), polymethaxylylene adipamide (nylon MXD6), polyundecamethylene terephthalamide (nylon 11T), polyundecamethylene hexa Hydroterephthalamide (nylon 11T (H)) and their copolyamides, mixed polyamides, etc., among which nylon 6, nylon 66
Is particularly preferred.

The relative viscosity of the polyamide resin is not particularly limited, but is preferably in the range of 1.5 to 5.0 in terms of relative viscosity measured at a temperature of 25 ° C. and a concentration of 1 g / dl using 96% by weight sulfuric acid as a solvent. . When the relative viscosity is less than 1.5, the mechanical strength of the yarn for artificial grass decreases. On the other hand, if the relative viscosity exceeds 5.0,
It is not preferable because the spinning property rapidly decreases.

The swellable fluoromica-based mineral of the present invention is obtained by substituting the hydroxyl group of synthetic mica with fluorine, and is represented by the following formula. αMF · β (aMgF ₂ · bMgO) · γSiO ₂ (where M represents sodium or lithium, α, β,
γ, a and b represent coefficients, respectively, 0.1 ≦ α ≦ 2, 2 ≦ β
≦ 3.5, 3 ≦ γ ≦ 4, 0 ≦ a ≦ 1, 0 ≦ b ≦ 1, a + b
= 1. )

As a method for producing such a swellable fluoromica-based mineral, for example, silicon oxide, magnesium oxide and various fluorides are mixed, and the mixture is heated at a temperature of 1400 to 1500 ° C. in an electric furnace or a gas furnace. Completely melts and crystallizes the fluoromica-based mineral in the reaction vessel during the cooling process.
There is a so-called melting method.

There is also a method in which talc is used as a starting material, and alkali ions are intercalated into the starting material to obtain a fluoromica-based mineral (Japanese Patent Laid-Open No. 2-149415). In this method, talc is mixed with alkali silicofluoride or alkali fluoride, and then 700-1200 ° C in a magnetic crucible.
And heat-treating for a short time to obtain a swellable fluoromica-based mineral.

The swellable fluoromica-based mineral in the present invention preferably accounts for 0.01 to 10% by weight, more preferably 0.1 to 10% by weight, of the entire reinforced polyamide resin. If this ratio is less than 0.01% by weight, the hot water shrinkage rate,
Improvement effects such as variation in crimp rate and heat resistance cannot be expected.
On the other hand, if this proportion exceeds 10% by weight, it becomes difficult to produce yarn, which is not preferable.

In order to obtain the reinforced polyamide resin of the present invention, a predetermined amount of the swellable fluoromica-based mineral is present in a monomer such as aminocarboxylic acid, lactam or diamine and dicarboxylic acid which form the polyamide resin. The monomer may be polymerized.

In the reinforced polyamide resin, a pigment, a release agent, a heat stabilizer,
Antioxidants, flame retardants, plasticizers and the like can be added.

The yarn for artificial turf of the present invention can be produced by using the apparatus used for yarn production of conventional polyamide-based yarn as it is. Usually, a yarn for artificial turf and a drawing and stretching device are used. It is manufactured by

For example, a reinforced polyamide resin in which the swellable fluoromica-based mineral is uniformly dispersed is prepared by the above-described method, and the reinforced polyamide resin is supplied to a usual single-component or composite-component melt-extruding spinning apparatus to be spun. Stretched according to,
It can be obtained by twisting after heat-setting.

Further, in the present invention, a reinforced polyamide resin (A component) in which a swellable fluoromica-based mineral is uniformly dispersed and a thermoplastic resin (B) containing no swellable cleavage mineral are used.
Component) and a yarn for artificial turf can be obtained by using the resin composition of
It is possible to use a sheath-type composite yarn for artificial lawn. In this case, the content of the component A is preferably 50% by weight or more.

Specific examples of the component B include, in addition to the above polyamide resin, polybutadiene, butadiene / styrene copolymer, acrylic rubber, ethylene / propylene copolymer, ethylene / propylene / butadiene copolymer, natural rubber, Chlorinated butyl rubber, elastomers such as chlorinated polyethylene and their acid-modified products such as maleic anhydride, styrene / maleic anhydride copolymer, styrene / phenylmaleimide copolymer, polyethylene, polypropylene, butadiene / acrylonitrile copolymer, Polyvinyl chloride, polyethylene terephthalate, polybutylene terephthalate, polyacetal, polyvinylidene fluoride, polysulfone, polyphenylene sulfide, polyether sulfone, phenoxy resin, polyphenylene ether, polymethylene Methacrylate, polyether ketone, polycarbonate, there is polytetrafluoroethylene.

[0025]

Next, the present invention will be described more specifically with reference to examples. In addition, the measuring method of the raw materials and characteristic values used in the examples and comparative examples is as follows.

1. Raw material Swellable fluorinated mica-based mineral To talc ground by a ball mill to have an average particle size of 2 μm, sodium silicate having an average particle size of 2 μm is mixed so as to be 20% by weight of the total amount. The mixture was placed in a magnetic crucible and kept at 800 ° C. for 1 hour in an electric furnace to synthesize a fluoromica-based mineral. Wide-angle X-ray diffraction measurement (Rigaku, RAD) of the generated fluoromica-based mineral powder
−rB type wide-angle X-ray diffractometer), the peak disappeared for the thickness of 9.2 ° in the c-axis direction of the raw material talc,
A peak corresponding to 12 to 16 ° indicating the formation of swellable fluoromica-based mineral was observed. Reinforced nylon 6 resin (A-1) To 10 kg of ε-caprolactam, 1 kg of water and 150 g of swellable fluoromica-based mineral were added, and the mixture was placed in a 30 liter reactor and ε-caprolactam was added. By polymerization, a reinforced nylon 6 resin (A-1) was obtained. The polymerization reaction was performed as follows. That is, the raw material mixture is
The mixture was heated to 50 ° C., and while gradually releasing water vapor, the pressure was increased to 1.5 MPa, and then released to normal pressure, followed by polymerization at 260 ° C. for 3 hours. When the polymerization was completed, the reinforced nylon 6 resin was discharged from the reaction vessel, and cut into pellets. The pellets were treated with hot water at 95 ° C., refined, and then dried in vacuum. The reinforced nylon 6 resin had a relative viscosity of 2.5 and contained 1.5% by weight of a swellable fluoromica-based mineral. In addition, as a result of wide-angle X-ray diffraction measurement of the reinforced nylon 6 resin pellets, the peak in the thickness direction of the swellable fluoromica-based mineral completely disappeared. It was found that the minerals were uniformly dispersed. Reinforced nylon 6 resin (A-2) Reinforced nylon 6 resin (A-2) was prepared in the same manner as described above except that 400 g of swellable fluoromica-based mineral was used instead of 150 g of swellable fluoromica-based mineral. 2) was obtained. This reinforced nylon 6 resin had a relative viscosity of 2.4 and contained 4.0% by weight of a swellable fluoromica-based mineral. Also,
As a result of performing wide-angle X-ray diffraction measurement on the pellets of the reinforced nylon 6 resin, the peak in the thickness direction of the swellable fluoromica-based mineral completely disappeared, and the swellable fluoromica-based mineral was completely contained in the nylon 6 resin. It was found that they were uniformly dispersed. Nylon 6 A1030BRF, relative viscosity, manufactured by Unitika Ltd. 3.1 Antistatic agent An aqueous solution in which Elmina 770 (main component: anionic phosphate ester) manufactured by Marubishi Yuka Co., Ltd. is dissolved at a ratio of 3% by weight.

2. Measuring method (a) Hot water shrinkage ratio It was determined by immersing the artificial grass lawn (monofilament, 450 denier) in boiling water for 30 minutes and measuring the length before and after immersion. (b) Vertical streak occurrence rate It was determined by measuring the area where vertical streaks occurred with respect to the entire surface area of the crimped lawn. (c) Sand input rate When sand was input to the crimp lawn, it was determined by measuring the amount of sand that could actually be input, relative to the total input of input sand.

Example 1 Using a reinforced nylon 6 resin (A-1), melt spinning, drawing and heat setting were carried out using a conventional artificial grass lawn die and a draw-drawing apparatus to obtain 2700 denier / 6 filaments ( A single filament (450 denier) was obtained. At this time, an extruder having an inner diameter of 40 mm was used, and the resin temperature was set to 220 to 260 ° C. Next, after twisting 12 multifilaments, it is made into yarn for artificial turf by steam treatment, and is tufted (sewn) to a base cloth made of a slit yarn fabric made of polypropylene. The crimped lawn was obtained by cutting the tip of this yarn (this condition is referred to as "pile"). The crimp turf was processed into a lawn and sprayed with an aqueous solution containing an antistatic agent, and processed without spraying an aqueous solution containing an antistatic agent.

Example 2 Reinforced nylon 6 resin instead of reinforced nylon 6 resin (A-1)
A multifilament and a crimp lawn were obtained in the same manner as in Example 1 except that (A-2) was used.

Comparative Example 1 A multifilament and a crimp lawn were obtained in the same manner as in Example 1 except that nylon 6 was used instead of the reinforced nylon 6 resin (A-1).

Table 1 summarizes the characteristic values of Examples 1 and 2 and Comparative Example 1.

[0032]

[Table 1]

[0033]

According to the present invention, it is possible to obtain an artificial turf yarn having a small shrinkage of hot water, good dimensional stability, and a low rate of occurrence of vertical streaks when formed into an artificial turf. In addition, since the shrinkage in the moisture drying step after spraying the aqueous solution containing the antistatic agent in the final step of the product is small, the appearance of the final product is evenly finished, and at the same time, the sand is repelled when forming an artificial grass containing sand It is possible to put it in smoothly.

Claims (2)

[Claims] 1. An artificial turf yarn comprising a reinforced polyamide resin in which a swellable fluoromica-based mineral is uniformly dispersed, and which constitutes the whole or a part of the artificial turf yarn. 2. The artificial turf yarn according to claim 1, wherein the reinforced polyamide resin is obtained by uniformly dispersing 0.01 to 10% by weight of a swellable fluoromica-based mineral.