KR102572936B1 - Clay court for sports facilities - Google Patents

Abstract

The present invention relates to a substrate layer including a clay chip and a polyurethane binder; and clay sand formed on the base layer, and a clay court for sports facilities formed by attaching a hydrophilic additive to a surface of the clay sand, and a method for manufacturing the same. The clay coat for sports facilities not only provides good water permeability, but also has a uniform and consistent hardness, so there is little risk of injury, excellent durability, and excellent moisture retention and weather resistance while being environmentally friendly.

Description

Clay court for sports facilities

The present invention relates to a clay court for sports facilities used on floors of sports facilities such as tennis courts, foot volleyball courts, and multipurpose fields, and a manufacturing method thereof.

More specifically, the present invention provides a substrate layer including a clay chip and a polyurethane binder; and clay sand formed on the substrate layer, wherein a hydrophilic additive is attached to the surface of the clay sand, thereby providing good water permeability and having even and constant hardness, thereby reducing the risk of injury. The present invention relates to a clay coat for sports facilities that is low in moisture content, has excellent durability, is environmentally friendly, and has excellent moisture retention and weather resistance, and a method for manufacturing the same.

Recently, as interest in health increases and the population of sports for life increases, sports facilities such as tennis courts, baseball fields, foot volleyball courts, and multi-purpose baseball fields are increasing around living spaces such as school playgrounds, neighborhood parks, and apartments.

Among these sports facilities, tennis clay courts are typically made of finely pulverized shale, rocks, or bricks, and the surface layer of the tennis clay court is formed using ocher, mass, lime, and salt.

The conventional tennis clay court using such ocher, massa, lime, and salt has the advantage of protecting the player's ankle or knee joint by having slipperiness and elasticity, but when it rains, it is easily lost by rainwater or irregularities occur However, it takes a lot of time and money to maintain the clay court, and in particular, the tennis clay court cannot be used immediately because water remains for a long time even after it rains in the area where the surface is dug during rain.

Recently, mixed surface materials made of a mixture of natural soil, lime, and cinder have been used as surface materials for tennis courts, baseball fields, and athletics fields. In many cases, it is hardened and hardened, so there is a problem that the permeability is eventually lowered, and playground surface materials using stone dust such as serpentine and gamhyeonam are also used, but they are very weak in viscosity and water retention and are expensive, so they are not economical for users. had a problem.

In this regard, Korean Patent Registration No. 10-0479941 discloses a method for manufacturing a surface layer material for a tennis court by drying natural loess in the sun or using a hot air blower, and then pulverizing the ocher with a conventional roller device. After taking only the powder; Disclosed is a method for manufacturing a surface layer material for a tennis court, characterized in that it consists of a process of preparing a surface layer material by mixing the ocher powder, masato, sand, lime, jade powder, and roasted salt.

In addition, Korean Patent Laid-open Publication No. 10-1991-0006574 discloses a powder composition for surface layers such as playgrounds containing 70% by weight of red brick grains, 12% by weight of red clay, 15% by weight of quartz sand, 3% by weight of lime, and 1% by weight of calcium chloride is starting

In addition, Korean Patent Registration No. 10-0950154 discloses a mixed soil produced by mixing 70% by weight of loess, 20% by weight of sea sand, and 10% by weight of lime to reinforce the bottom of a tennis clay court washed away by rainwater; After bringing seawater into a salt field and naturally evaporating moisture with wind and sunlight, salt water with a salt content of 30% and the mixed soil and the salt water are poured and kneaded, and then granules having a diameter of about 3 to 5 mm are made by a conventional granulating machine, Disclosed is a mixed earth salt granule for reinforcing the floor of a tennis clay court, characterized in that it comprises granules produced by drying the granules.

However, as in the present invention, the substrate layer including clay chips and a polyurethane binder; and clay sand formed on the base layer, wherein a hydrophilic additive is attached to the surface of the clay sand, thereby providing good water permeability and having even and constant hardness, thereby reducing the risk of injury. A clay coat for sports facilities, which is low in moisture content, excellent in durability, environmentally friendly, and has excellent moisture retention and weather resistance, and a method for manufacturing the same are not disclosed.

Patent Document 1: Korean Patent Registration No. 10-0479941 Patent Document 2: Korean Patent Publication No. 10-1991-0006574 Patent Document 3: Korean Patent Registration No. 10-0950154

The present invention is to solve such conventional problems, and includes a substrate layer including a clay chip and a polyurethane binder; and clay sand formed on the base layer, wherein the clay court is formed by attaching a hydrophilic additive to the surface of the clay sand, thereby providing good water permeability and having a uniform and constant hardness to prevent injury. It is an object of the present invention to provide a clay court for sports facilities that is less dangerous, has excellent durability, is environmentally friendly, and has excellent moisture retention and weather resistance.

In addition, the present invention can not only prevent excessive scattering, but also prevent microcracks on the surface layer of the stadium, maintain high hardness and smoothness of the stadium floor for a long period of time due to excellent sliding characteristics and footing, and prevent moisture It is an object of the present invention to provide a clay court for sports facilities that is rapidly absorbed and transferred to the lower layer and can contain a certain amount of moisture for a long period of time to maintain optimal conditions as a stadium floor for a long period of time.

The above object is, according to the present invention, a substrate layer including a clay chip and a polyurethane binder; and clay sand formed on the substrate layer, and a clay court for sports facilities formed by attaching a hydrophilic additive to a surface of the clay sand.

Also, the weight ratio of the clay chips and the polyurethane binder is preferably 100:6 to 20.

In addition, the polyurethane binder is 4,4'-methylenediphenyldiisocyanate, o-(p-isocyanatobenzyl)phenylisocyanate, diphenylmethanediisocyanate, 2,2'-methylenediphenyldiisocyanate, toluene It is preferably formed by including at least one selected from the group consisting of diisocyanate.

Also, the hydrophilic additive is preferably glycerol.

Also, the clay sand is preferably used in combination with titanium dioxide.

Preferably, the average particle size of the clay chips is 2 mm to 8 mm, and the average particle size of the clay sand is 0.1 mm to 1 mm.

The clay coat of the present invention not only provides good water permeability, but also has an even and constant hardness, so there is little risk of injury, and excellent durability, and is environmentally friendly and has excellent moisture retention and weather resistance.

In addition, the clay court of the present invention can prevent excessive scattering and also prevent micro cracks on the surface layer of the stadium.

In addition, the clay court of the present invention can maintain high hardness and smoothness of the stadium floor for a long period of time due to its excellent sliding properties and foot tread properties.

In addition, the clay court of the present invention absorbs moisture quickly and transfers it to the lower layer, and can contain a certain amount of moisture for a long period of time to maintain optimal conditions as a stadium floor for a long period of time, thereby improving performance.

1 and 2 are views respectively showing a clay chip and clay sand according to an embodiment of the present invention.

Hereinafter, a clay coat and a manufacturing method thereof according to the present invention will be described in detail. Various changes can be made to the present invention and it can have various forms, and preferred embodiments will be described in detail below. However, the following description is not intended to limit the invention to any particular form. Those skilled in the art to which the present invention belongs can understand that the present invention includes all modifications, equivalents, and substitutes included in the principles and technical ideas of solving the problems of the present invention.

In an embodiment of the present invention, the clay court for sports facilities includes a substrate layer including clay chips and a polyurethane binder; and clay sand formed on the base layer, and a hydrophilic additive is attached to the surface of the clay sand. Clay chips and clay sand that can be used in the clay court for sports facilities of the present invention are shown in FIGS. 1 and 2 .

Clay that can be used in the clay court for sports facilities of the present invention refers to fine-grained soil containing one or more minerals, and can be variously classified according to size and/or mineralogy.

In an embodiment of the present invention, the base layer may be formed by mixing clay chips and a polyurethane binder. More specifically, the base layer may be formed by mixing clay chips and a polyurethane binder for about 3 minutes, and may be formed as one layer having a thickness ranging from about 15 to 50 mm by mixing clay chips and a polyurethane binder. can

In the present invention, since the base layer is formed by mixing clay chips and a polyurethane binder, it does not contain harmful heavy metals, can be prepared by a simple mixing process without a separate solvent, and maintains smooth water permeability even after immersion. Therefore, it has excellent durability effect.

In an embodiment of the present invention, the clay chips and the polyurethane binder may be mixed in a weight ratio of about 100:6 to 20. When the weight ratio of the clay chip and the polyurethane binder satisfies the above range, the strength is enhanced by more effective mixing, and a uniform sliding effect and constant ball rebound characteristics can be expected, especially external factors such as load or impact It is not easily damaged by the body, reducing the risk of injury, and has the advantage of providing a comfortable effect for joints.

In an embodiment of the present invention, the polyurethane binder is 4,4'-methylenediphenyldiisocyanate, o-(p-isocyanatobenzyl)phenylisocyanate, diphenylmethanediisocyanate, 2,2'-methylenedi It may be formed by including one or more selected from the group consisting of phenyl diisocyanate and toluene diisocyanate, and may be appropriately adjusted according to the environment or conditions of use.

In the present invention, when mixing the clay chips and the polyurethane binder, various additives may be added as needed. Examples of additives include stress relievers such as nitrile rubber and butadiene rubber; inorganic flame retardants such as antimony trioxide, antimony pentoxide, tin oxide, tin hydroxide, molybdenum oxide, zinc borate, barium metaborate, red phosphorus, aluminum hydroxide, magnesium hydroxide and calcium aluminate; brominated flame retardants such as tetrabromobisphenol A, tetrabromophthalic anhydride, hexabromobenzene, and rominated phenol novolac; phosphorus-based flame retardants; oxidation stabilizers, light stabilizers, moisture resistance improvers, thixotropic diluents, diluents, antifoaming agents, various other resins, tackifiers, antistatic agents, lubricants, ultraviolet absorbers, and the like.

Meanwhile, in an embodiment of the present invention, the hydrophilic additive attached to the surface of the clay sand is preferably glycerol. In the present invention, since the glycerol contains a hydroxyl group in its chemical structure, when used by being attached to the surface of clay sand, it can provide various effects such as preventing excessive scattering through strong water absorption.

In general, clay courts for sports facilities must prevent excessive scattering, have excellent sliding properties and footing properties, and contain a certain amount or more of moisture to reduce the occurrence of injuries. To this end, in the past, calcium chloride or salt has been added to secure surface moisture, and relatively inexpensive salt has been widely used. However, even if salt is used as described above, there are still problems in that excessive dust is still generated, cold resistance is insufficient, and maintenance is not easy, such as very cumbersome work to restore it when a part is damaged.

On the other hand, when the hydrophilic additive, which is glycerol, is used as in the present invention and attached to the surface of the clay sand, hydrogen bonds can be made by the hydroxyl group to have affinity for water, and thus it is easy to contain more than a certain amount of water. Therefore, excessive scattering of the clay court is prevented to prevent contamination of the surroundings, and micro cracks on the surface layer of the stadium can be prevented. In addition, it has the advantage of being able to maintain high hardness and smoothness of the stadium floor for a long period of time due to its excellent treadability.

In addition, general clay coats easily lose topsoil during rainfall, but when the hydrophilic additive, glycerol, is attached to the surface of the clay sand as in the present invention, moisture is rapidly absorbed and transferred to the lower layer, and a certain amount of moisture can be contained for a long period of time. It also has the advantage of greatly improving the performance because it can maintain the optimal conditions as a stadium floor for a long period of time.

Meanwhile, in an embodiment of the present invention, the clay sand is preferably used in combination with titanium dioxide. Titanium dioxide is a molecule in which one atom of titanium, a transition metal, and two atoms of oxygen are combined. It is a tasteless and odorless white powder. As in the present invention, when titanium dioxide and clay sand are used in combination, when in contact with water, the hydrophilicity is further enhanced, and the water on the surface goes well with titanium dioxide, so the contact angle with water spreads widely to 5 degrees or less, You can always keep it moist with a smooth supply of moisture. Accordingly, since the dust collection effect is excellent, such as dust does not occur even in strong wind, respiratory diseases can be prevented, and a slip phenomenon can be prevented, thereby providing a function of preventing safety accidents. In addition, titanium dioxide is photooxidatively decomposable, so when light is absorbed by titanium dioxide, two electron and hole carriers are generated. Water present in the atmosphere by oxidation of holes generates hydroxyl radicals with high oxidative decomposition power. Electrons react with oxygen to generate superoxide radicals and then to hydroxyl radicals. The generated hydroxyl radical oxidizes and decomposes organic compounds such as CO, NOx, SOx, and VOC (volatile organic compounds). Therefore, when used in combination with titanium dioxide as in the present invention, it not only reduces the concentration of harmful substances to the human body such as SOx, NOx, CO, and VOC, but also provides an effect of improving wear resistance. In addition, since titanium dioxide has a micro size, the particles are dense and the flow of gas is difficult, thereby providing an effect of reducing the calorific value. Titanium dioxide may be used in both rutile and anatase, but preferably in the anatase phase. In the present invention, the weight ratio of clay sand and titanium dioxide may be used in the range of 100:0.5 to 10.

In an embodiment of the present invention, the average particle size of the clay chips may be 2 mm to 8 mm. If the average particle size of the clay chips is less than 2 mm, the water permeability of the base layer may be deteriorated, and if the average particle size of the clay chips is 8 mm or more, there are too many voids, and foreign substances may flow into the base layer to cause defects there is

In an embodiment of the present invention, it is preferable to use the clay sand having an average particle size of 0.1 mm to 1 mm.

On the other hand, the present invention relates to a method for manufacturing a clay coat for sports facilities that not only provides good water permeability, but also has even and constant hardness to reduce the risk of injury, has excellent durability, is environmentally friendly, and has excellent moisture retention and weather resistance.

In a specific embodiment of the present invention, the method for manufacturing the clay coat includes forming a base layer including clay chips and a polyurethane binder, forming clay sand on the base layer, and adding a hydrophilic additive to the surface of the clay sand. may include the step of attaching. In this case, specific details of the base layer formed by mixing the clay chips and the polyurethane binder, the clay sand formed on the base layer, and the hydrophilic additive attached to the clay sand are as defined above.

The clay court for sports facilities of the present invention manufactured by the above method not only provides good water permeability, but also has a uniform and constant hardness, so there is little risk of injury, excellent durability, and is environmentally friendly and has excellent moisture retention and weather resistance, so it can be used indoors. Alternatively, it may be suitably used for sports facilities such as outdoor sports facilities or living spaces, tennis courts, baseball fields, foot volleyball fields, and multi-purpose fields.

The scope of the present invention is not limited to the above-described embodiments, but may be implemented in various forms of embodiments within the scope of the appended claims. Anyone with ordinary knowledge in the art to which the invention pertains without departing from the subject matter of the invention claimed in the claims is considered to be within the scope of the claims of the present invention to various extents that can be modified.

Claims (6)

a substrate layer including clay chips and a polyurethane binder; and
Including clay sand formed on the base layer,
A clay court for sports facilities formed by attaching a hydrophilic additive to the surface of the clay sand,
The base layer is formed by mixing clay chips and a polyurethane binder, and is formed of one layer having a thickness in the range of 15 to 50 mm,
The weight ratio of the clay chips and polyurethane binder is 100:6 to 20,
The polyurethane binder is 4,4'-methylenediphenyldiisocyanate, o-(p-isocyanatobenzyl)phenylisocyanate, diphenylmethane diisocyanate, 2,2'-methylenediphenyldiisocyanate, toluene diisocyanate It is formed including one or more selected from the group consisting of,
The hydrophilic additive is glycerol,
The clay sand is used in combination with titanium dioxide, and the weight ratio of the clay sand and titanium dioxide is 100:0.5 to 10,
The clay court for sports facilities, characterized in that the average particle size of the clay chips is 2 mm to 8 mm, and the average particle size of the clay sand is 0.1 mm to 1 mm. delete delete delete delete delete