JPH03197703A - Cushion pad material and constructing thereof, and artificial lawn laminate and application thereof - Google Patents

Abstract

PURPOSE:To form an inexpensive laminate of artificial lawn by constructing, on the surface of a backing, the cushion pad formed of a sheet made of foamed body having a number of through holes and a layer made of vulcanized rubber chips including binders for filling of the above-mentioned through holes. CONSTITUTION:Water-permeable asphalt concrete backing 6 is coated with isocyanate primer and after the coating is dried, a sheet 2 made of expanded polyethylene body is spread and is temporarily stuck thereon with a roller. Then vulcanized rubber chips 4 are mixed with urethane binders 3, and the mixture is spread over the sheet 2 made of expanded polyethylene body and is uniformly rolled. Through holes of the sheet are filed with the rubber/binder mixture 4 by means of a trowel, and finishing is made flat. After hardening of the rubber chips layer 4, artificial sod 5 made of polypropylene is laid on the finished surface and filling with silica sands is made thereon. Thereby, a layered body of the artificial sodding having efficient capacity of drainage and moderate hardness that is not enough soft and hard to suffer permanent set can be formed.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to artificial turf used for grounds such as baseball fields and tennis courts, and its construction method, as well as cushion pad materials and base materials for artificial turf. Regarding its construction method.

<Prior Art> The cushion pad material that is the base material for artificial turf is mainly used to impart elasticity and absorb shock, and foams such as vinyl chloride and polyethylene are most widely used.

As an example, FIG. 3 shows an example of the construction of a relatively soft vinylidene chloride-based artificial turf 11 and a cushion pad material 12 that is a base material for the artificial turf 11 currently used at Tokyo Air Dome. The cushion pad material used here is made of approximately 10 times expanded vinyl chloride foam.

As a result, it is hard and has a suitable amount of elasticity, making it highly stable when laying artificial turf due to the foam's own weight. However, this vinyl chloride foam is quite expensive and at the same time is unsuitable for sand-filled artificial turf.

As another example, Fig. 4 shows sand-covered artificial turf 1
3, and a mixture 15 of pulverized vulcanized rubber and foamed rubber as the cushion pad material 14 is added to the urethane binder 1.
An example of the structure of an artificial turf laminate made of cushioning material bonded and molded and cured in step 6 is shown. In particular, in the example shown in FIG. 4, the uneven molding process is performed on the side of the cushion pad material where the cushion pad material and the underlying surface are in direct contact. This improves the soft feel when force is applied from above, and at the same time, the uneven parts can absorb more energy from the impact.

However, this cushion pad material made of a mixture of vulcanized rubber, crushed rubber, and binder is extremely soft and expensive, so it cannot be used for general artificial turf that does not contain sand.

Further, in FIG. 5, as the cushion pad material 17, 3
An example of using a 0x expanded vinyl chloride foam is shown below.
Although the vinyl chloride foam used here is cheaper than the above-mentioned foam, it has the disadvantage that it easily shrinks due to heat, and once it shrinks, it is difficult to recover and easily collapses. In this case as well, since it is a molded product, there is a drawback that the unevenness of the base remains on the surface where the artificial turf is laid.

<Problems to be Solved by the Invention> Therefore, the present invention solves the above-mentioned prior art and creates an artificial turf surface that is not too soft, does not sag due to heat shrinkage, is not easily affected by the substrate, and has a flat surface. The purpose of the present invention is to provide cushion pad materials with excellent moldability, artificial turf laminates, and methods of constructing these materials at low cost. Moreover, by changing the modulus and thickness of the rubber chip layer, elasticity and shock absorption properties can be adjusted over a wide range, and surface flatness can also be improved because the unevenness of the base can be corrected by the rubber chip layer.

Means for Solving the Problems> That is, the present invention provides a cushion pad material to be laid as a base material for artificial turf, which includes a foam sheet having a large number of through holes, and a foam sheet having a foam sheet so as to fill these through holes. Provided is a cushion pad material characterized by having a binder-containing vulcanized rubber chip layer provided on a foam sheet.

The present invention also provides a method for laying or adhering a foam sheet having through-holes on a base surface, and then filling the through-holes of the foam sheet with vulcanized rubber chips containing a binder from above the sheet to reach the base surface. To provide a method for constructing a cushion pad material, which is characterized in that the cushion pad material is laminated in such a manner as to be laminated.

Furthermore, the present invention provides an artificial turf laminate, characterized in that artificial turf is laid or adhered on the rubber chip layer of the cushion pad material.

According to the present invention, the foam sheet surface of the cushion pad material is placed on the base surface, the cushion pad material is laid or adhered to the base surface, and artificial turf is placed on the rubber chip ffi of the cushion pad material. To provide a method for constructing artificial turf, which is characterized by laying or gluing.

The present invention will be explained in detail below.

The cushion pad material of the present invention is mainly used as a base material for artificial turf.

FIG. 1 shows a schematic diagram of the cushion pad material of the present invention. This cushion pad material 1 includes a foam sheet 2 having a large number of through holes on a base surface 6, and a binder 3 provided on the foam sheet 2 so as to fill the through holes.
and a vulcanized rubber chip layer 4 containing.

The foam sheet used in the cushion pad material of the present invention is preferably a foamed plastic, and includes, for example, foamed polystyrene, foamed polyurethane, foamed polyethylene, or foamed vinyl chloride. Particularly preferred is foamed polyethylene in terms of cost and durability.

By using a foam sheet, it is possible to obtain a cushion pad material with a low modulus that cannot be obtained simply from vulcanized rubber chips containing a binder.

The foam sheet preferably has an expansion ratio of 20 to 30 times. If it is less than 20 times, it will have poor elasticity and shock absorption, and if it is more than 30 times, it will be too soft, causing problems in terms of durability and athletic performance.

Further, as a specific example, the foam sheet of the present invention has through holes 7, as shown in a plan view of the foam sheet in FIG.

The size of this through hole is not particularly limited, but preferably has a diameter of 10 to 40 mm, more preferably 15 to 40 mm.
Preferably, it is 25 mm.

If it is less than 15 mm, the filling of the holes will be insufficient due to the viscosity of the rubber chip binder mixture, and if it exceeds 30 mm, the effect of the rubber chip layer in the through holes may appear on the surface of the artificial turf.

Further, it is preferable that the through holes exist at regular intervals.

As a guideline, the through hole should be 10 to 30 cm, depending on the diameter.
It is preferable that they be arranged at intervals of m. If the distance is more than 30 cm, the adhesion area between the vulcanized rubber chip containing the binder and the base surface is small, so that when the cushion pad material and the base surface are bonded via the binder, the adhesion is insufficient. If the thickness is less than 10 cm, the rubber chip layer occupies a large proportion of the cushion pad material, resulting in a lack of softness of the cushion pad material.

The vulcanized rubber chips used in the present invention are pulverized vulcanized rubber such as natural rubber, styrene-butadiene rubber (SBR), polybutadiene rubber (BR), and ethylene propylene rubber (EPT), and are especially used for waste tires. The one obtained by pulverizing is the most suitable in terms of economy and supply stability.

The particle size used is in the range of 0.5 to 10 mm, but 1 to 4 mm is used.
Particle sizes of mm are most commonly used.

By using vulcanized rubber chips, it is possible to obtain a cushion pad material that has appropriate elasticity, is resistant to fading, and has excellent surface flatness moldability.

The binder used to bond the vulcanized rubber chips together is a synthetic resin binder, and known synthetic resin materials such as polyurethane, acrylic ester copolymer, styrene-butadiene rubber, polyester, and polyepoxide are used. , one-component system and two-component system, solvent-free type,
There are solvent-based, emulsion, and latex types, but polyurethane is the most popular due to its durability, physical properties, and elasticity.

Polyurethane is a prepolymer or partial prepolymer having an isocyanate group at the end of the molecule, and the polyisocyanates used in its production include aromatic compounds such as tolylene diisocyanate (2,4-2,6-isomer or a mixture thereof) and diphenylmethane diisocyanate. isocyanates and aliphatic isocyanates such as hexamethylene diisocyanate and dicyclohexylmethane diisocyanate, and are 111 or a mixture of two or more thereof.

The polyols used when reacting with these polyisocyanates to obtain prepolymers or partial prepolymers are most often polyether polyols such as polyoxypropylene glycol and polytetramethylene ether glycol, but polyester polyols are also used. , esters of higher fatty acids containing hydroxyl groups can also be used.

The prepolymer or partial prepolymer has two or more isocyanate groups at the end, and the isocyanate content is 5
~15% is preferred.

The mixing ratio of the vulcanized rubber chips and the synthetic resin binder is approximately 1:3 to 10:1, but preferably approximately 1:4 to 1:8.

In addition to the vulcanized rubber chips and synthetic resin binder described above, a curing accelerator may be added.

Further, on the rubber chip layer of the above-mentioned cushion pad material, depending on the purpose and necessity, artificial grass 5 containing sand or no sand may be placed or adhered to form an artificial grass laminate.

The on-site construction method for the cushion pad material of the present invention is that at the site where the cushion pad material is to be laid or bonded, a foam sheet having through-holes is first laid, and then the above-mentioned There is a method of filling vulcanized rubber chips containing a binder.

By providing vulcanized rubber chips containing a binder in the through-holes of the foam sheet and on the foam sheet, the foam sheet is fixed by the binder-containing rubber chips in the through-holes, so that the rubber chip columns are attached to the holes of the foam sheet. The elasticity of the rubber chip pillars can prevent permanent shrinkage of the cushion pad material.

When using the above construction method, adhesive may be applied to the base surface of the foam sheet in advance, but by sequentially applying it on site, you can eliminate the need to use new adhesive.
The binder in the vulcanized rubber chips filled in the through-holes allows the vulcanized rubber chips to be bonded to each other, and at the same time, the binder in the rubber chips allows the bottom surfaces of the rubber chip pillars formed in the sheet through-holes to bond to the underlying surface.

In addition, if it is necessary to firmly place artificial turf on the cushion pad material, it is possible to adhere the artificial turf using the above-mentioned or other binder without applying a new adhesive or fixing it with rivets. can.

In the present invention, when artificial turf is laid, the load from the artificial turf is not applied directly to the foam sheet, but is dispersed by the vulcanized rubber chip layer, and at the same time, due to the action of the rubber chip pillars mentioned above, the load from the artificial turf is not applied directly to the foam sheet. There is less settling and more stability.

In addition, water from the surface of the ground such as artificial turf can flow through the minute gaps in the vulcanized rubber chip layer and flow out from the through holes, resulting in good drainage.

Another construction method is to fill the through-holes of the foam sheet with vulcanized rubber chips containing a binder in advance, then provide a layer of vulcanized rubber chips on the foam sheet, and then dry the binder, allowing it to be moved. Another method is to install cushioning pad material. At this time, if necessary, artificial turf may be used that has been adhered in advance.

If you want to use this movable cushion pad material to fix the base surface and cushion pad material, you can apply a new adhesive to the base surface side of the foam sheet and adhere it at the site. .

By using this construction method, on-site work becomes easier and the construction period is shortened due to prefabrication.

<Examples> The present invention will be described in more detail below using Examples.

(Example) Using the materials shown below, an artificial turf laminate was obtained according to the construction procedure described below.

Base: Water-permeable Ascon polyethylene foam sheet: A pressure-sensitive adhesive was applied in advance to the side in contact with the base. It has a thickness of 8 mm, a width of 1 m, a foaming ratio of 30 times, and has through holes with a diameter of 20 mm at a pitch of 20 cm (vertical and horizontal directions).

Rubber chip layer...vulcanized rubber chip 1-3mm, 100
20 parts by weight of moisture-curing urethane binder
Mixed parts by weight.

Artificial grass: Polypropylene pile length approximately 9mm.

Construction procedure> ■Passing the polyethylene foam sheet Isocyanate-based brimer was applied to the water-permeable ascon base. After drying, a polyethylene foam sheet was spread and temporarily adhered using a roller.

■Construction of Rubber Chip Layer The vulcanized rubber chips and urethane binder were mixed using a mixer, the mixture was spread on a polyethylene foam sheet, and the layer was uniformly applied to a thickness of 8 mm using a tandem smoother, a rubber chip application machine manufactured by Yokohama Rubber. At this time, an 8 mm thick iron flat plate rail was used as the guide rail for the construction machine, but in order to prevent the rail from sinking due to the deflection of the foam sheet, the rail was placed on the line connecting the through hole, and the rail was placed 8 mm inside the through hole.
A m-thick piece of iron was placed on top of which the rail could be placed.

After the rails and iron pieces were removed, a rubber chip/binder mixture was filled with a trowel and the surface was finished flat.

■Attaching the artificial turf After the rubber chip layer had hardened, polypropylene artificial turf was placed and filled with No. 4 silica sand in an amount of 25 kg/m''.

<Effects of the Invention> The cushion pad material of the present invention is not too soft, has appropriate hardness, and is less susceptible to heat shrinkage, so it does not easily deteriorate.

In addition, due to these characteristics, it is less affected by the underlying surface,
When artificial turf is laid on a cushion pad material, it has excellent surface formability and also has good drainage properties.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a state in which the artificial turf and cushion pad material of the present invention are installed on a base surface. FIG. 2 shows a plan view of the foam sheet of the present invention. FIG. 3 is a schematic diagram showing the structure of vinylidene chloride artificial turf and cushion pad material conventionally used in ball game fields. 4 and 5 are the same (explanation of schematic symbols 1.12, 14.17... cushion pad material, 2.
... Foam sheet, 3.16... Binder 4... Vulcanized rubber chip layer, 5.13... Artificial grass (with sand), 6... Base surface, 7... Through hole, - ...Artificial grass, 5...Sponge foam rubber chip

Claims (4)

[Claims] (1) A cushion pad material to be laid as a base material for artificial turf, which consists of a foam sheet with many through holes and a binder-containing additive provided on the foam sheet to fill these through holes. A cushion pad material comprising a sulfur rubber chip layer. (2) laying or adhering a foam sheet having through holes on the base surface, and further filling the through holes of the foam sheet with vulcanized rubber chips containing a binder from above the sheet;
A method of constructing a cushion pad material, characterized in that the cushion pad material is laminated while reaching the base surface. (3) An artificial turf laminate, characterized in that artificial turf is laid or adhered on the rubber chip layer of the cushion pad material according to claim 1. (4) With the foam sheet surface of the cushion pad material according to claim 1 as the base surface side, the cushion pad material is laid or glued on the base surface, and artificial turf is laid on the rubber chip layer of the cushion pad material. Or an artificial turf construction method characterized by gluing.