JP2000239923A - Yarn for antibacterial artificial lawn and antibacterial artificial lawn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a yarn which is useful for an antibacterial artificial lawn having the excellent persistent antibacterial property and is not discolored, even when used outdoors for a long period, by adding a specific amount of zinc oxide particles whose surfaces are coated with a coupling agent. SOLUTION: This yarn for an antibacterial artificial lawn comprises a polyamide resin, such as nylon-6, containing 0.1-5.0 wt.%, preferably 0.5-3.5 wt.%, of zinc oxide particles which have an average particle diameter of 0.1-5.0 μm, preferably 0.5-3.0 μm, and whose surfaces are coated with a coupling agent such as a silane coupling agent. The yarns for the antibacterial artificial lawn are preferably used to produce the antibacterial artificial lawn. The polyamide preferably has a relative viscosity of 2.0-5.0 under conditions comprising using 96% sulfuric acid at a temperature of 25 deg.C in a concentration of 1 g/dl.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antibacterial artificial turf yarn and an antibacterial artificial turf made of a polyamide resin containing an antibacterial agent.

[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, gate ball fields, golf practice mats, poolside mats, parks, hospitals, schools and kindergartens. It is widely used in public spaces, home gardens, terraces and verandas. As the material, polyamide resin yarns such as nylon 6 and nylon 66 are usually used frequently because they have excellent mechanical strength, abrasion resistance, gloss, feel, dyeability and the like.

[0003] However, artificial turf made of these polyamide resin yarns has a problem that microorganisms are liable to be generated due to a high moisture content when wet, resulting in poor hygiene. Especially when used in poolside, park, hospital, school, kindergarten, home garden, terrace, veranda etc.
It is necessary to prevent the generation and growth of microorganisms.

[0004] In general, a method of preventing the generation and proliferation of microorganisms by washing or sterilizing artificial turf is adopted. However, the artificial turf is very difficult to clean and sterilize due to its complicated structure. It is something. Therefore, an artificial turf having antibacterial properties is demanded.

In order to impart antibacterial properties to artificial turf, for example, there is a method of coating the surface of artificial turf with a bactericide or an antibacterial spray. However, according to this method, a bactericide or an antibacterial agent is merely attached to the surface of the artificial turf, and especially on a pile surface (turf surface) in contact with a human body, friction and abrasion are caused. There is a problem that the antibacterial property is reduced. Thus, an antibacterial artificial turf yarn in which the pile yarn itself is provided with antibacterial properties has been proposed.

In order to impart antibacterial properties to a yarn for artificial turf made of polyamide fibers such as nylon 6 and nylon 66, it is a common method to include a silver-based inorganic antibacterial agent. Examples of these silver-based inorganic antibacterial agents include a phosphate-based antibacterial agent carrying silver ions, a zeolite-based antibacterial agent carrying silver ions, and a hydroxyapatite calcined product-based antibacterial agent carrying silver ions. well known. However, the artificial turf yarn containing such a silver-based inorganic antibacterial agent has good antibacterial properties and excellent durability under normal use, but is exposed to the outdoor natural environment for a long time. Then, there is a disadvantage that silver, which is an antibacterial component, is oxidized and discolored (colored). In addition, there was a problem that the cost was increased.

[0007]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems, exhibits good antibacterial properties, and has almost no discoloration (coloring) and little decrease in antibacterial properties even when used outdoors for a long period of time. It is a technical object to provide an artificial turf yarn and an antibacterial artificial turf.

[0008]

Means for Solving the Problems The present invention has been made as a result of intensive studies to solve the above-mentioned problems, and has reached the present invention. That is, the present invention has the following points (1) to (4). (1) An antibacterial artificial turf yarn comprising a polyamide resin containing 0.1 to 5.0% by weight of zinc oxide fine particles whose surfaces are coated with a coupling agent. (2) The antibacterial artificial turf yarn according to (1), wherein the zinc oxide fine particles have an average particle size of 0.1 to 5.0 μm. (3) An antibacterial artificial turf using the antibacterial artificial turf yarn according to (1) or (2).

Hereinafter, the present invention will be described in detail. Polyamide resins constituting the antibacterial artificial turf yarn of the present invention 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 1
1), polidodecamide (nylon 12), polybis (4-aminocyclohexyl) methanedodecamide, (nylon PA
CM12), polybis (3-methyl-4-aminocyclohexyl) methandodecamide (nylon dimethyl PACM12), polymethaxylylene adipamide (nylon MXD6), polyundecamethylene terephthalamide (nylon 11T), polyundecamethylene hexa There are homopolymers or copolymers such as hydroterephthalamide [nylon 11T (H)] or a mixture thereof, among which nylon 6 homopolymer, nylon 6 copolymer, nylon 66 homopolymer, nylon 66 copolymer is preferable, and nylon 6 homopolymer and nylon 66 copolymer are particularly preferable.

[0010] The relative viscosity of the polyamide resin is
It is preferable that the value measured at a temperature of 25 ° C. and a concentration of 1 g / dl using 96% by weight sulfuric acid is in the range of 1.5 to 6.0,
It is particularly preferred that it is in the range of 2.0 to 5.0. If the relative viscosity is less than 1.5, the mechanical strength of the artificial turf yarn decreases. On the other hand, when the relative viscosity exceeds 6.0, the spinning property is rapidly reduced, which causes trouble in the processing step.

The antibacterial agent to be contained in the antibacterial artificial turf yarn of the present invention is a zinc oxide fine particle whose surface is coated with a coupling agent (hereinafter referred to as “coupling-treated zinc oxide fine particle”). is necessary.

Zinc oxide fine particles have a bactericidal action and an antibacterial action in addition to the action of absorbing and deodorizing ultraviolet rays.
Due to its photocatalytic activity, it has the disadvantage that when it is incorporated into a resin, it undergoes photodegradation, resulting in inferior physical properties of the resulting yarn. That is, the photocatalytic activity of the zinc oxide fine particles is a reaction on the surface of the particles, and attempts to suppress the activity by treating the surface of the particles have been made. For example, a microencapsulated surface treatment for cutting off contact with oxygen or water has been performed, and the zinc oxide fine particles subjected to this treatment optically have the properties of zinc oxide, but have a chemical property. Had the problem of losing the properties of zinc oxide.

Therefore, in the present invention, in order to suppress the photocatalytic activity, which is a drawback of zinc oxide fine particles, and to have optically and chemically zinc oxide properties, zinc oxide subjected to coupling treatment is used. Use fine particles.

The coupling agent is not particularly limited, but a silane coupling agent is preferable. For example, a silane coupling agent KBM-403 manufactured by Shin-Etsu Chemical Co., Ltd.
KBM-403-503 and the like. Examples of the coupling agent other than the silane coupling agent include coupling agents such as titanium-based, aluminum-based, zirconium-based, and zircoaluminate-based coupling agents. The coating amount of the coupling agent depends on the surface area of the zinc oxide fine particles, but is preferably about 0.1 to 20% by weight.

Since the surface of the zinc oxide fine particles is coated with the coupling agent as described above, the photocatalytic activity of the zinc oxide fine particles can be sufficiently suppressed with a small coating amount without waste. The absorption action, antibacterial action and bactericidal action can be maintained as they are. For this reason, the yarn containing the zinc oxide fine particles subjected to such coupling treatment is prevented from being discolored by ultraviolet rays,
At the same time, effects such as antibacterial and sterilizing are achieved.

The content of the zinc oxide fine particles subjected to the coupling treatment in the polyamide resin must be in the range of 0.1 to 5.0% by weight, and is preferably in the range of 0.5 to 3.5% by weight. If the content is less than 0.1% by weight, a yarn for artificial turf having sufficient antibacterial properties cannot be obtained. On the other hand, when the content exceeds 5.0% by weight, yarn breakage occurs during spinning or drawing, operability is deteriorated, and yarn quality performance such as high elongation of yarn is deteriorated.

In order to prevent problems such as abrasion of the guide and passability in the process from spinning to winding, the zinc oxide fine particles have an average particle size of 0.1 to 0.1.
It is preferable to use one of 5.0 μm, and 1.0 to 3.0
μm is more preferred. If the average particle size exceeds 5 μm, clogging of the filter during spinning increases,
Operability deteriorates. On the other hand, when the average particle diameter is smaller than 0.1 μm, the specific surface area increases, so that the particles tend to aggregate during kneading with the polyamide resin, which causes clogging of the filter during spinning.

Further, the zinc oxide fine particles subjected to the coupling treatment may be used by directly mixing with the resin pellets, or the form of a master pellet containing 2 to 50% by weight of the zinc oxide fine particles subjected to the coupling treatment may be used. May be used in

The artificial turf yarn of the present invention is often colored green, but is not limited to this. As the color pigment, a general synthetic resin color pigment can be used.
For example, brilliant green PTMA toner, diamond green PTMA toner as green pigment, phthalocyanine green, phthalocyanine green (yellow mouth), fast yellow 10G, disazo yellow as yellow brown pigment
AAA, Disazo Yellow AAMX, Disazo Yellow AAOT,
Yellow iron oxide, Disazo Yellow HR, Au containing azo yellow,
Orange pigments: dinitroaniline orange, disazo orange PMP, dianisidine orange, red pigments: toluidine red, chlorinated para red, brilliant fast scarlet, pyrazolone red B, barium red 2B, calcium red 2B, barium lithol red,
Rake Red C, Brilliant Carmine 6B, Pigment Scarlet 3B Lake, Rhodamine 6GPTMA toner, Bengala, Naphthol Red FGR, Quinacridone Magenta, Quinacridone Red, Rhodamine B as purple pigment
PTMA toner, dioxazine bio red, Victoria Pure Blue PTMA toner as a blue pigment, phthalocyanine blue (α type), phthalocyanine blue (β type),
Alkaline blue toner, navy blue, ultramarine, white pigments such as calcium carbonate, barium sulfate, zinc carbonate, titanium dioxide, magnesium carbonate, talc, and black pigments such as carbon black.

The mixing ratio of the color pigment is preferably 0.1 to 10 parts by weight based on 100 parts by weight of the total of the polyamide resin and the zinc oxide fine particles subjected to the coupling treatment.
If the compounding ratio of the coloring pigment is less than 0.1 part by weight, it becomes difficult to develop the required color tone. On the other hand, if the compounding ratio exceeds 10 parts by weight, the ratio of the polyamide resin is reduced, and a yarn for artificial grass having excellent mechanical strength cannot be obtained. The coloring pigment may be used by directly mixing it with the resin pellet, or may be used in the form of a master pellet containing the coloring pigment in a proportion of 2 to 50% by weight.

Further, as long as the properties (antibacterial properties) of the present invention are not impaired, antistatic agents, deodorants, anti-mite agents, matting agents, weathering agents, heat stabilizers, antioxidants, flame retardants An additive such as a plasticizer can be contained in the artificial turf yarn.

The antibacterial artificial turf yarn of the present invention may be multifilament or monofilament, and has a single-filament fineness.
50 to 1500 d. The cross-sectional shape of the artificial turf yarn may be any of a round shape, a flat shape, and a hollow shape.

In producing the antibacterial artificial turf yarn, it is possible to use the same device as that used for the conventional yarn production of polyamide resin yarns. It is manufactured by using a drawing and stretching apparatus. For example, it can be obtained by supplying a coupled zinc oxide fine particle as a raw material to a usual melt extrusion spinning apparatus, spinning the resultant, and, if necessary, stretching and heat-setting, followed by twisting.

The antibacterial artificial turf of the present invention is obtained by twisting and crimping the antibacterial artificial turf yarn produced by the above method, tufting (punching) the base fabric as a pile (turf material), Backing to secure pile and base fabric. At this time, a woven fabric, a knitted fabric, a nonwoven fabric, or the like is used as the base fabric, and a woven fabric made of polypropylene or polyethylene terephthalate is preferable. As the backing substrate, styrene-butadiene latex (SBR) or nitrile-butadiene latex (NBR)
And synthetic resins such as polyacrylates and polyvinyl chloride. Further, the backing substrate may contain an organic nitrogen-sulfur compound such as thiabendazole or the like in order to suppress the generation and proliferation of microorganisms such as bacteria and mold.

[0025]

Next, the present invention will be described specifically with reference to examples. In addition, the measurement of the characteristic value in an Example and a comparative example was performed as follows. (a) Relative viscosity The relative viscosity was measured at a concentration of 1 g / dl and a temperature of 25 ° C. using 96% sulfuric acid as a solvent. (b) High elongation Using a Shimadzu Autograph AGS-50D, sample length 25c
m and a pulling speed of 25 cm, and an initial load of 1/30 g of the fineness (d) was applied. (c) Antibacterial activity The antibacterial activity was evaluated by a bacterial count method using Staphylococcus aureus in accordance with the SEK Standard of the Textile Sanitary Processing Association.
The evaluation was performed by subtracting the logarithmic value of the increase in the number of bacteria of the same type of artificial turf yarn containing no antibacterial agent from the logarithm of the increase in the number of bacteria of the obtained antibacterial artificial turf yarn. As for the antibacterial artificial turf, a sample subjected to a weathering treatment irradiated with a sunshine weather meter manufactured by Suga Test Instruments Co., Ltd. for 500 hours was used to evaluate the antibacterial property in the same manner as the antibacterial artificial turf yarn. (d) Color Tone The color tone of the antibacterial artificial turf subjected to the weathering treatment in the same manner as in (b) was visually judged in a gray scale.

Example 1 Nylon 6 resin having a relative viscosity of 3.5 ("A1030BR" manufactured by Unitika Ltd.)
T)) 98.0 parts by weight, 2.0 parts by weight of zinc oxide fine particles treated with silane as an antibacterial agent (“Z-NOUVE” manufactured by Mitsui Kinzoku Co., Ltd., average particle size 1.0 μm), copper iodide 0.
03 parts by weight and green pigment as coloring pigment (using master pellet “PAM (F) 2946 green (UI)” manufactured by Dainichi Seika)
Using 1.8 parts by weight, melt spinning, drawing and heat setting are performed using ordinary artificial grass dies and take-off drawing equipment to obtain 2700 denier / 6 filament (single yarn 450 denier) multifilament (antibacterial artificial Turf yarn). At this time, an extruder with an inner diameter of 40 mm was used,
The resin temperature was set to 250 ° C. Then, using this antibacterial artificial turf yarn as a turf material, tufting was performed on a polypropylene woven cloth ("Polybag" manufactured by Koizumi Hemp Co., Ltd.), backing with styrene-butadiene latex (SBR), Artificial turf.

Examples 2 and 3 and Comparative Examples 1 and 2 Table 1 shows the amounts of the nylon 6 resin having a relative viscosity of 3.5 and the antibacterial agent.
Except for having been changed as shown in
An antibacterial artificial grass yarn and an antibacterial artificial grass were obtained.

Example 4 A nylon 66 resin having a relative viscosity of 2.7 (Zytel 101L manufactured by DuPont) was used instead of the nylon 6 resin having a relative viscosity of 3.5.
An antibacterial artificial turf yarn and an antibacterial artificial turf were obtained in the same manner as in Example 1 except that the resin temperature in the extruder was changed to 270 ° C.

Examples 5 to 6, Comparative Examples 3 to 4 Table 1 shows the blending amounts of the nylon 66 resin having a relative viscosity of 2.7 and the antibacterial agent.
Except for having been changed as shown in
An antibacterial artificial grass yarn and an antibacterial artificial grass were obtained.

Examples 7-8, Comparative Examples 5-6 Antibacterial artificial turf yarns and antibacterial properties were obtained in the same manner as in Example 1 except that the average particle size of the zinc oxide fine particles was changed as shown in Table 1. I got artificial turf.

Example 9 An antibacterial artificial turf yarn was prepared in the same manner as in Example 1 except that a nylon 6 resin having a relative viscosity of 2.3 (“A1030BRL” manufactured by Unitika) was used instead of the nylon 6 resin having a relative viscosity of 3.5. And antibacterial artificial turf was obtained.

Example 10 An antibacterial artificial turf yarn was prepared in the same manner as in Example 1 except that a nylon 6 resin having a relative viscosity of 5.0 ("A1050" manufactured by Unitika) was used instead of the nylon 6 resin having a relative viscosity of 3.5. And antibacterial artificial turf was obtained.

Examples 11 to 14 Antibacterial artificial turf yarns and antibacterial artificial turf were obtained in the same manner as in Example 1 except that coloring pigments as shown in Table 1 were used instead of phthalocyanine green. . In addition, as a white pigment, master pellet “MA
T-NC20 '', a master pellet `` PAM (F) 10545 Brown (UI) '' manufactured by Dainichi Seika as a yellow-brown pigment, and a master pellet `` PAM (F) 10087 Blue manufactured by Dainichi Seika as a blue pigment
(UI) ", and a master pellet" PAM (F) 129 Yellow (UI) "manufactured by Dainichi Seika Co., Ltd. was used as the orange pigment.

The compounding ratios in Examples 1 to 14 and Comparative Examples 1 to 6 and the characteristic values (strength, elongation,
Table 1 summarizes the evaluation results of the characteristic values (antibacterial properties) and the antibacterial artificial turf characteristics (antibacterial properties and color tone after weathering treatment).

[0035]

[Table 1]

As is clear from Table 1, Examples 1 to 14
The yarn for antibacterial artificial turf obtained in the above was excellent in high elongation yarn properties and high in antibacterial evaluation. Moreover, the antibacterial artificial turf had sufficient antibacterial properties and color tone even after the weathering treatment.

On the other hand, the comparative example has the following problem. In Comparative Examples 1 and 3, since the silane-coupled zinc oxide fine particles as the antibacterial agent were not contained, the artificial turf yarn and the artificial turf did not have antibacterial properties. In Comparative Examples 2 and 4, the content of the silane-coupled zinc oxide fine particles, which is an antibacterial agent, was too large, so that yarn breakage occurred during spinning and drawing, resulting in poor operability. And the yarn performance of high elongation was low. In Comparative Example 5, since the average particle size of the zinc oxide fine particles was too small, clogging of the filter occurred during spinning due to agglomeration of the particles, so that an antibacterial artificial grass yarn could not be produced. In Comparative Example 6, since the average particle size of the zinc oxide fine particles was too large, clogging of the filter occurred during spinning, and it was not possible to produce an antibacterial artificial turf yarn.

[0038]

According to the present invention, it is possible to obtain a yarn for artificial turf having excellent yarn properties such as high elongation and exhibiting good antibacterial properties. In addition, the artificial turf using the yarn for artificial turf as a pile has almost no discoloration (coloring) or a decrease in antibacterial property even when used for a long time, and is sufficiently used for applications requiring weather resistance such as outdoors. Can be used.

Claims (3)

[Claims] An antibacterial artificial turf yarn comprising a polyamide resin containing 0.1 to 5.0% by weight of zinc oxide fine particles whose surface is coated with a coupling agent. 2. The method according to claim 1, wherein the zinc oxide fine particles have an average particle size of 0.1 to 5.0.
The antibacterial artificial turf yarn according to claim 1, wherein the yarn has a size of μm. 3. An antibacterial artificial grass using the antibacterial artificial grass yarn according to claim 1 or 2.