JPH03122304A - artificial turf structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides artificial turf for golf courses, walking paths, etc., which is lightweight, resilient, has excellent stepping comfort (touch), and is easy to process.
The present invention relates to a ground structure suitable for use in parks, playgrounds, etc., and particularly to a ground structure suitable for use at teeing grounds of golf courses.

(Prior Art and Problems to be Solved) Traditionally, rubber tire waste has been used as an alternative to earthen pavement structures constructed from natural earth and sand materials such as clay and Antucar on the surface of playgrounds, for example. Tire crumbs are fixed with rubber latex or latex cement.

However, it is slippery when wet from rain, etc.
If the rubber-like elasticity is too strong, fatigue may easily occur. Furthermore, similar problems have arisen on walking paths, such as drainage of rainwater, blowing during strong winds, and poor feel when walking.

In order to solve the above-mentioned conventional problems, the applicant has developed a ground structure that can be used for a wide range of structures, such as artificial ground surfaces that have a natural feel and excellent formability and workability, and landscaping surfaces. An application was filed for the composition (Japanese Patent Application No. 63-26230), and by incorporating rubber particles into the composition of the above application, it is stable and does not lose its elasticity even during long-term use.
Furthermore, an application was filed for a composition for ground structures that has excellent tee insertion strength (Japanese Patent Application No. 1-37363).
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However, the ground structures formed using these compositions are heavy and have insufficient workability. In addition, when used as a teeing ground, the restoring force of the structure is not necessarily sufficient, as the hole when the tee is inserted easily disappears due to stepping on it when the tee is pulled out. This has caused problems such as not necessarily providing a sufficient feel when stepping on the product.

Therefore, an object of the present invention is to provide a ground structure such as a conventional artificial turf structure that is lightweight, has excellent feel and workability, and has resilience.

(Means for Solving the Problems) As a result of intensive studies to achieve the above object, the inventors have found that:
The present invention was achieved by discovering that the above object can be easily achieved by constructing a ground structure from inorganic particles or organic particles and a foamed polyurethane resin (crosslinked if necessary).

The present invention will be explained in detail below.

The ground structure of the present invention is composed of inorganic particles or organic particles and foamed polyurethane resin.

Various inorganic particles can be used in the present invention, such as sand, glass particles, talc, calcium carbonate, and clay.

These inorganic particles may be colored with a coloring agent or the like depending on the intended use of the composition of the present invention. Preferred inorganic particles include sand, calcium carbonate or talc. Examples of the sand include sea sand, mountain sand, river sand, and crushed stone. Furthermore, the color of the sand and the size of the particles can be appropriately selected depending on the application. For example, sea sand or river sand may be used for a gray ground structure such as a sandbox, and mountain sand may be used for a yellowish ground structure.

In addition, in order to give the ground structure a natural feel, for example,
At the manufacturing stage of polyurethane foam, which will be described below, by sprinkling sand or the like on top of the polyurethane foam just before it hardens, it is possible to create a natural appearance that does not look like an artificial product. Also, if the particle size of the sand to be sprayed is large, it will settle quickly, although it has something to do with the specific gravity, so it will fall down and less will remain on the surface before the polyurethane hardens. However, if you want to create a natural look, it is preferable to have a smaller particle size.

The size of sand particles is generally 0.05 to 3.5 in diameter.
The amount of chu, preferably 0.5 to 2.5 ff1m.

If the sand has a large particle size, the strength of the ground structure will decrease, so it is preferable to mix it with sand with a small particle size.

As the organic particles, for example, rubber particles and particles of thermoplastic synthetic resin such as polyethylene resin, for example, pellets thereof, can be used.

By using organic particles, it is possible to prevent the ground from hardening, and the weight of the ground structure can be further reduced.

As the foamed polyurethane resin used in the present invention, basically any resin that has been conventionally used in the field of foamed polyurethane resins can be used. Foamed polyurethane resins are generally obtained by reacting polyisocyanate and polyol in the presence of a blowing agent. Polyisocyanate is a compound having incyanate groups on two sides in the molecule. Examples of polyisocyanates such as q include various ones such as tolylene diisocyanate and diphenylmethane diisocyanate.

On the other hand, polyol is a compound having hydroxyl groups on two sides in the molecule. Examples of such polyols include various polyether polyols and polyester polyols.

As the foaming agent, for example, water or Freon is usually used.

In producing the foamed polyurethane resin, the reaction between the polyisocyanate and the polyol may be carried out in the presence of a catalyst such as triethylamine, triethylenediamine, or tetramethylenepropanediamine.

In the present invention, by crosslinking the foamed polyurethane resin with a crosslinking agent, the strength or hardness of the resulting ground structure can be freely adjusted depending on the degree of crosslinking. Such crosslinking agents include, for example, neutral polyols such as glycerin and 1,4-butane dionopediethylene glycol, and amines such as ethanolamine and polyethylene polyamine, either as they are or with propylene oxide added. Crosslinking agents can be used.

In addition to the above ingredients, foam stabilizers, flame retardants, mold release agents,
Various additives such as colorants can be added as necessary.

The size of these fillers is generally 0.1 to 4,5 in diameter.
mm, preferably 0.5 to 2.5.

The degree of foaming of the geostructure is typically 3-50 based on the foaming ratio for the polymer. As the degree of foaming increases, the flexibility of the ground structure increases.

In addition, when crosslinking is performed with a crosslinking agent, the degree of crosslinking usually increases according to the amount of the crosslinking agent, and accordingly,
The hardness of the ground structure increases.

The preferred amount of crosslinking agent is 15% by weight or less, based on the amount of foamed polyurethane resin. If it is more than this,
This is not desirable because the ground structure tends to become hard or brittle.

The weight ratio of foamed polyurethane resin to inorganic particles is generally 7.
The range is from 5:25 to 10:90. The weight ratio of foamed polyurethane resin to organic particles (or a mixture of inorganic and organic particles) is generally 75 = 25 to 30 nia.

The ground structure of the present invention is produced by mixing a polyol, a blowing agent, and a crosslinking agent if necessary, then adding a filler to this mixture, and finally adding polyisocyanate or its prepolymer, and quickly mixing the mixture. After that, it is formed by filling it into a mold and hardening it. For example, ground structures such as teeing grounds can be easily formed by filling a mixture containing polyisocyanate between turf-like members arranged at regular intervals in a formwork and curing it. .

If necessary, sand or a pigment that provides a natural look may be sprinkled onto the surface of the foamed polyurethane resin immediately before curing.

(Effects of the Invention) According to the present invention, since the ground structure is formed of sand and foamed polyurethane resin, it is lighter than a structure made of only sand combined, and can be easily molded in a formwork. can do. Furthermore, because the sand and foamed polyurethane resin are bonded, for example, when used on a teeing ground, the tee can be easily stabbed and stably held, and the puncture hole after the tee is pulled out. It also gets blocked quickly. Furthermore, it has an excellent feel when stepping on it. Therefore, the ground structure of the present invention is very useful especially as a teeing ground.

(Example) Hereinafter, the present invention will be explained in more detail with reference to Examples. In addition, unless otherwise specified, all percentages are expressed on a weight basis.

Example 1 As a polyether polyol, 100 parts of Sunnix FA-708 manufactured by Sanyo Chemical Industries, 0.4 parts of a propylene glycol solution solid content of triethylenediamine (33.3%) as an amine catalyst, and San Abbott ■ tlcat-1000, 0.3 parts, as a metal salt catalyst,
Stanus octate, manufactured by Sanshaki Synthesis Co., Ltd., 0.12 parts,
As a foam stabilizer, 5RX-294A manufactured by Toray Silicon Company
, 1.0 part, and water in the proportions shown in Table 1 below were mixed to prepare a polyol solution.

Sand (sea sand, particle size: 0.1
10111) was blended. Into the polyol solution thus formed, T-80 manufactured by Nippon Polyurethane Co., Ltd. was blended as a polyisocyanate in the proportions shown in Table 1 below.
After stirring quickly, the resulting mixture was injected between rows of bundles of thermoplastic synthetic resin strips arranged and fixed at predetermined intervals in a frame, and then cured. Table 1 shows the results of the feeling when stepped on (a), restoring force (b), and turf retention force (C) of the artificial turf structure thus obtained.

Table (note) * (a): Feeling: Bad
Very good ◎ Example 2 As a polyether polyol, 100 parts of Sunnix FA-703 manufactured by Sanyo Chemical Industries, as an amine catalyst, 0.6 parts of propylene glycol solution solid content of triethylenediamine (33.3%) and Sun Abbott's Ucat-1000, 0.5 parts, foam stabilizer and shite, toreshi! J:] 5RX-274C manufactured by M Company, 2.0 parts, triethanolamine as a crosslinking agent in the amount shown in Table 2 below, and 1.0 part of water (about 8 times foaming in the resin part) A polyol solution was prepared by mixing sand (sea sand, particle size :1.0mm) or polyethylene resin pellets (average particle size: 3.5+nm) were blended as necessary.To the polyol solution thus formed, Nippon Polyurethane Co., Ltd. was added as a polyisocyanate in the proportions shown in Table 2. TM80-20 was blended and quickly stirred, then injected between the east rows of turf-like members and cured in the same manner as in Example 1. Properties (a) to (C) are shown in Table 2.

Table 2 (Foaming ratio of resin part is constant) (Note) *: Sand polyethylene resin/< L/-) (5
0:50 (vol)) (average pellet size: 3.5 mm).

Note that characteristics (a) to (C) have the same meanings as in Table-1.

Example 3 As a polyether polyol, 100 parts of Sanyo Chemical Co., Ltd.'s Nix FA-708, as an amine catalyst, 0.4 part of propylene glycol solution solid content of triethylenediamine (33.3%), and San Abbott ( 1
As a crosslinking agent, the amount shown in Table 3 below, A polyol solution was prepared by mixing ethanolamine, water, and an appropriate amount (corresponding to a foaming ratio of about 4 times in the resin portion). Inorganic particles [calcium carbonate (average particle size = 3.0μ)
or talc (average particle size: 22.0 μ)] or organic particles [polyethylene resin granules (average particle size: 20.7
mm)) was blended. To the polyol solution thus formed, T-80 manufactured by Nippon Polyurethane Co., Ltd. was blended as a polyisocyanate in the proportions shown in Table 3, and after stirring quickly, a turf-like member was prepared in the same manner as in Example 1. Injected between the east columns and allowed to harden. Properties (a) to (C) of the artificial turf structure thus obtained are shown in Table 3.

Table 3 (Expansion ratio of resin part is constant) (Note) *1: Polyethylene resin granule (average particle size: 0.7 mm) *2: Calcium carbonate (average particle size:
3μ) *3: Talc (average particle size: 22μ) Characteristics (a) to (C) have the same meanings as in Table-1.

Claims (2)

[Claims] (1) A ground structure made of inorganic or organic particles and foamed polyurethane resin. (2) The ground structure according to claim 1, wherein the inorganic particles are sand, calcium carbonate, or talc. (3) The ground structure according to claim 1, wherein the organic particles are crushed rubber pieces or plastic particles. (4) Claim 1: Crosslinked with a crosslinking agent
The ground structure described.