JPS6057381B2 - Method for imparting antistatic properties to synthetic resin artificial lawns - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for imparting antistatic properties to synthetic resin artificial lawns.

Synthetic resins generally have electrical insulation properties, and molded products made from them are easily charged by masatsu et al.

This phenomenon is especially noticeable on synthetic resin artificial lawns installed outdoors, and when walking on them,
The human body is electrically charged; for example, when you touch a metal fence surrounding an enclosure, the accumulated static electricity is discharged and you receive an electric shock.
I often feel uncomfortable. ,'I,,ι,＾Λ
+ Mausoleum 112 Reshifu Parable 1 '7 PiL, tl As a means of preventing static electricity on carpets and artificial lawns, the following various methods have generally been used.

(1) A method of applying an antistatic agent from the outside or mixing the antistatic agent into the raw synthetic resin material before molding.

(2) A method in which the conductive material itself is blended into the synthetic resin raw material prior to molding.

However, these conventionally known methods are not necessarily satisfactory.

In other words, in the case of method (1), the applied antistatic agent may be washed away by rainwater, physically rubbed by pedestrians, or deteriorated by sunlight, resulting in long-term damage. It is not possible to expect the effects to last for a long time.

In method (2), the antistatic effect of the molded product is nearly permanent, but it requires the use of a large amount of conductive material, which limits the molding operation and reduces the quality of the molded product. There are some inconveniences in inviting someone. For example, when carbon fluorac is used as the conductive material, the resulting molded product is colored black and cannot be colored, reducing its commercial value. Metal powders such as aluminum powders and iron powders do not exhibit the desired charging effect unless they are blended with the resin raw material in a small amount equal to or greater than the weight of the valve opening. Such blending amounts can significantly impair the mechanical strength of the five products. cormorant. In addition, metal fibers and carbon fibers are cut during the kneading operation with the raw material resin, and because of their fibrous nature, not only do they lose their antistatic properties, but they also become particles due to the cutting action. Coloring of the product is unavoidable. The present inventors have developed such conventionally known synthetic resin products,
In particular, as a result of various studies aimed at eliminating the electrostatic property found in artificial lawn-like products, we have found that electrostatic charge can be prevented by interposing conductive fibrous chops such as carbon fiber or metal fiber in the leaves of synthetic resin artificial grass. I discovered that it can be effective.

(Utility Application No. 51-79435). However, in order to interpose the above-mentioned conductive fibrous chops in the leaf-like parts, it is necessary to manually glue them or to entangle them with the leaf-like parts, which is inefficient.

The present inventors have conducted various studies on methods to improve such inefficiency, and as a result, they have arrived at the present invention. In a method for imparting antistatic properties to a synthetic resin artificial lawn having a structure in which a large number of artificial lawns are planted, a pair of electrodes, one of which is a flat plate, is coated with the synthetic resin on the inside of the flat electrode (the side facing the other electrode). The manufactured artificial lawn is planted on the surface of the base so that the leaves face toward the other electrode; conductive fibrous chops are placed on the other electrode, and a high DC voltage is applied between the two electrodes. The present invention provides a method for imparting antistatic properties to a synthetic resin artificial lawn in which the conductive fibrous chops are attracted and adhered to the substrate between the leaf portions of the synthetic resin artificial lawn by applying .

The present invention will be explained in more detail below. Examples of synthetic resins that are materials for artificial lawns to which the present invention is applied include polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, 3-nylon, polyester, synthetic urethane, Examples include synthetic rubber, but the material is not particularly limited to these specific examples as long as it is a thermoplastic resin that has a relatively soft feel.

The synthetic resin artificial lawn to which the present invention is applied has a structure that includes holes for drainage and a backing material when subjected to the antistatic treatment described in Section 4. (not shown) and a large number of natural grass-like leaves 1 planted integrally on the surface of the flat substrate 2, which may have anti-static treatment. From the viewpoint of ease of handling, it is preferable that the leaf-like portions be planted approximately perpendicularly to the surface of the sheet-like substrate.

Of course, the leaf-shaped parts 1 in the synthetic resin artificial lawn after antistatic treatment may remain perpendicular to the surface of the base 2, or in order to have an appearance similar to that of a natural lawn with a horizontal layer. It is also possible to form a structure in which the tips of the leaf-like portions are bent by applying heat or cold breath, etc., to make them stand up in a row. Next, examples of conductive fibrous chops applied to the method of the present invention include metal fibers themselves such as stainless steel fibers and copper fibers;
The fibrous chops are not particularly limited as long as they are electrically conductive, such as conductive fibers formed by coating the surface of carbon fibers or synthetic fibers with metal fine particles or carbon fine particles, or by plating or vapor-depositing metal.

The diameter of these fibrous chops is preferably 50 μm or less; if it is thicker than this, the antistatic effect will decrease, the weight of the fibrous chops will increase, and it may cause damage to the base of the artificial lawn. This causes adverse effects such as difficulty in attracting and adhering. In addition, these fibrous chops are straight and straight, and the cut surface is perpendicular to the axis and has a diameter of 2Tn,/m.
It is preferable to have uniform lengths of ~20 m/m; if the length is short, it will be hidden deep inside the leaf-like part and when a person walks on it, it will be too far away from the sole of the shoe, reducing the antistatic effect. do.

On the other hand, if the length is longer than the above-mentioned length, it will be difficult to attract to the leaf-like parts or reach the base of the artificial lawn to be subjected to antistatic treatment during attraction and attachment, and therefore, the attachment operation will be difficult. Next, to explain the method of carrying out the present invention, first, a pair of electrodes is formed, the electrode on the side where the synthetic resin artificial lawn to be subjected to antistatic treatment is placed, and the electrode on the side where the conductive fibrous chop is placed. electrodes are prepared.

Of these, the former electrode is suitable for use in the form of a flat plate since the synthetic resin artificial lawn to be antistatically treated is in the form of a sheet, while the structure of the latter electrode is a fixed flat plate, a conveyor belt, etc. A swingable wire mesh shape, box shape, etc. can be selected arbitrarily. Examples of these pairs of electrodes will be explained based on the schematic diagrams shown in Figs. 2 to 5. In Fig. 2, A is a synthetic resin artificial lawn to be subjected to antistatic treatment by the method of the present invention, and both have leaf-like parts. It is arranged toward the other opposing electrode side.

3 shows the flat electrode on the side where this artificial lawn is placed,
The electrode may be either fixed or horizontally movable, and numeral 4 indicates a flat electrode as an example of the electrode on which the conductive fibrous chop is arranged.

FIG. 3 shows an example in which a belt conveyor 7 is provided as an electrode on the side where the conductive fibrous chops are arranged, and the conductive fibrous chops are arranged on this. In this example, a wire mesh is used as the electrode on the side to be placed, and in the antistatic treatment operation, the conductive fiber chops on the wire mesh are passed through the wire mesh by swinging horizontally, and the antistatic treatment is performed. Attractively adhere to synthetic resin artificial turf.

FIG. 5 shows a metal box-shaped electrode filled with conductive fibrous chops as another example of the electrode on the side where the conductive fibrous chops are arranged.

In these Figures 2 to 5, 5 indicates a DC high voltage power supply, and 6 indicates a ground.

In addition, in Figs. 2 to 5 above, the electrode on the side where the synthetic resin artificial lawn is arranged is explained as being fixed or movable horizontally, but the electrode is fixed and the synthetic resin artificial lawn itself is horizontally movable. It doesn't matter how you move it. In order to attract and adhere conductive fibrous chops to a synthetic resin artificial lawn by the method of the present invention, a high voltage may be applied to both of the electrodes from a DC high voltage power source. Then, the conductive fibrous chop is attracted in the direction of the arrow toward the synthetic resin artificial lawn placed on the opposing electrode side. In this case, the conductive fibrous chops are aligned in the direction of the electric field, so they pass between the leaves of the synthetic resin artificial lawn and are attached to the base of the synthetic resin artificial lawn in a substantially upright manner. (See Figure 6) The reason why this phenomenon occurs, that is, the phenomenon in which conductive fibrous chops stick upright, is not necessarily clear, but for example, the electrostatic phenomenon that the surface charge of charged conductive fibrous chops tends to gather at acute angles is not clear. The reason for this may be due to the properties of the conductive fibers, or because the fiber axes of the conductive fibrous chops are aligned parallel to the direction of movement, which reduces air resistance when the conductive fibers are attracted. Conceivable. In addition, in the synthetic resin artificial lawn imparted with antistatic properties by the method of the present invention, the conductive fibrous chops between the leaf parts penetrate deeply and adhere to the base part.
The fibers do not easily fall off and scatter, and there is no evidence that the antistatic effect will be impaired even when installed in a normal location, but it should be placed in a special location, such as a place that is frequently stepped on by humans. When used, in order to more firmly fix the conductive fibrous chops and prevent them from falling off or scattering, the area to which the conductive fibrous chops are attached must be treated with antistatic treatment. For example, the adhesive may be applied to the base portion or a leaf-like portion near the base portion. Incidentally, examples of adhesives that can be used in such cases include resin components such as chloroprene rubber, nitrile rubber, polyvinyl butyral, polyvinyl chloride, and modified polyethylene in a solvent such as toluene, methyl ethyl ketone, xylene, butyl alcohol, and butyl acetate. These include emulsions such as vinyl acetate emulsion, polyethylene emulsion, and polyacrylic acid ester emulsion, adhesives whose main components are phenol resin and epoxy resin, polyvinyl alcohol, and aqueous solutions of methyl cellulose. Materials for resin artificial lawns Consider the type of resin, adhesion suitability with conductive fibrous chop, viscosity, drying time, water resistance, weather resistance, and the location where the synthetic resin artificial lawn with antistatic treatment will be used. The above is selected as appropriate. In addition, thermosetting resins are added to these adhesives to increase water resistance, anti-aging agents and light stabilizers are added to increase weather resistance, and/or flexibility is added. A plasticizer or the like may be added to increase the

The adhesive may be applied by a known method such as feather coating, roll coating, or spraying, and is not particularly limited.

The present invention is a method of imparting antistatic properties to a synthetic resin artificial lawn constructed as described above, and has the following effects, and has great industrial utility value.

(1) Applying an antistatic agent to the surface of the molded product,
Compared to the conventional method of mixing an antistatic agent into the resin material for the mold, a more sustainable antistatic effect can be obtained.

(2) The antistatic treatment operation is extremely simple.

Next, the present invention will be further explained with reference to Examples.
The present invention is not limited to the following examples unless it exceeds the gist thereof. Example 1 Using a material containing Nopatek LM-420 (trade name of low-density polyethylene manufactured by Mitsubishi Kasei Corporation) as the main component, the method shown in Fig. A long artificial lawn of 1 Tn and width as shown in Fig. 1 was molded.

As shown in Figure 2, a part of this is shown in both electrodes (each with a vertical
C! A lobe-like part was placed inside one of the electrodes (flat plate shape, 100 cm wide) facing the opposite electrode, and a stainless steel fiber chop (diameter 8 μ, length 15 μm) was placed on the other electrode.
77! ．． When a DC high voltage of 60 KV was applied to both electrodes, the stainless steel fibrous chops were attracted and adhered to the entire surface of the artificial lawn substrate (Fig. 6B).
(see schematic diagram) The adhesion density is approximately 4 to 5 fibers/Clt.

The antistatic polyethylene artificial lawn obtained in this way was cold-pressed to give the upright leaves a bend, but the stainless steel fiber chops were almost upright against the substrate surface. It was attached and its tip was intertwined with the leaf. (See schematic diagram in Figure 6C). A length of approximately 7rrL of artificial grass treated with antistatic treatment was spread on a concrete floor, and the electrostatic voltage of a human body walking on it was measured using a method based on the Stroll method of JISL-1021. - At a relative humidity of about 40%, 3,
The voltage did not exceed 000V, and I did not feel an electric shock even when I touched a grounded metal rod quickly after walking. In addition, no significant shedding or scattering of the stainless steel fibers was observed even when many people walked on it for 6 months after it was laid, demonstrating a good antistatic effect.

Example 2 Using the same polyethylene artificial lawn as in Example 1, stainless steel fibers were used as conductive fibrous chops! Carbon fiber (diameter 7μ, length 15TrL) was used instead of the shaped chop.
/Tn) was used, but the same method as in Example 1 was used to perform antistatic treatment.

The resulting antistatic polyethylene artificial lawn exhibited the same antistatic effect as in Example 1. Example 3 The method described in Japanese Patent Publication No. 51-46777 was carried out using a material containing Ultrasenma-710 (trade name of ethylene-vinyl acetate copolymer resin manufactured by Toyo Soda Co., Ltd.) as the main component. Accordingly, an artificial lawn of 17 Tt and width as shown in FIG. 1 was molded.

Take a part of this and apply adhesive in a string shape along the length and direction on the surface of the base between the lobes, and then attach the lobes to the inside of one of the electrodes as shown in Figure 3. A stainless steel fiber chop (diameter 8 μ, length 10
7n/m) was applied to both electrodes at 60K while continuously and uniformly dispersing it.
When a DC high voltage of V was applied, the stainless steel fibrous chops passed through the leaves of the artificial lawn and were attracted and attached to the surface of the substrate at a substantially right angle. The artificial grass treated with anti-static treatment was left on the sheet for about an hour to dry the adhesive, and then cold-blanked to give the upright leaves a bend. It was attached almost upright to the lobes, and its tips were intertwined with the leaf-like parts.

The artificial turf treated with antistatic treatment thus obtained was tested for sustainability of antistatic properties in the same environment and in the same manner as in Example 1, but the effect was almost the same as in Example 1. showed that.

[Brief explanation of the drawing]

Figure 1 is an example of a synthetic resin artificial lawn to which the present invention is applied, Figures 2 to 5 are schematic diagrams of the electrode arrangement used to carry out the present invention, and Figure 6 is an example of a synthetic resin artificial lawn to which the present invention is applied. Another example of grass. 1... Leaf-like part, 2... Base part, 3, 4
・・・・・・Flat electrode, 5・・・DC high voltage power supply, 6・・・Earth, 7・・・Belt electrode, 8・・・Gold Mesh electrode, 9...box-shaped electrode, 1''...conductive fibrous chop.

Claims (1)

[Claims] 1. In a method for imparting antistatic properties to a synthetic resin artificial lawn having a structure in which a large number of natural grass-like leaves are planted on the surface of a sheet-like substrate, a pair of electrodes, one of which is flat, is used. The synthetic resin artificial lawn is arranged inside the flat plate electrode so that the leaf-like parts planted on the base surface face the other electrode side, and conductive fibrous chops are arranged on the other electrode side. A method for preventing static electricity on a synthetic resin artificial lawn, characterized in that the conductive fibrous chop is attracted and adhered to the substrate between the leaves of the synthetic resin artificial lawn by applying a DC high voltage between both electrodes. How to give gender.