KR102186680B1 - Elastic pavement materials for field paving on children's playground facilities - Google Patents

Abstract

The present invention relates to an on-site laying-type elastic packaging material for children's play facilities, wherein a urethane primer is applied to the surface of a concrete base layer, and a lower layer consisting of SBR (Styrene-Butadiene Rubber) chips and a urethane binder is applied to the upper surface of the urethane primer. In the elastic packaging material formed by laying an upper layer composed of EPDM (Ethylene Propylene Diene Monomer) chips and a urethane binder on the upper surface of the lower layer after installation, the lower layer is based on 100 parts by weight of the lower layer material to adsorb organic solvents and harmful gases. It is characterized in that it contains within 1 to 10 parts by weight of activated carbon (Activated Carbon).
The field-laying elastic packaging material for children's play facilities of the present invention is an SBR chip and an SBR chip in order to improve the bonding strength between the lower layer composed of SBR (Styrene-Butadiene Rubber) chips and urethane binder and the upper layer composed of EPDM (Ethylene Propylene Diene Monomer) chip and urethane-based binder. By controlling the particle size of the EPDM chip and setting the appropriate thickness of the upper and lower layers, it has excellent impact relief function and maintains uniform elasticity, and has excellent durability without interlayer separation. In addition, since the lower layer of the elastic packaging material contains activated carbon for effectively adsorbing organic solvents and harmful gases, it effectively adsorbs volatile organic solvents and harmful gases without deteriorating the physical properties of the elastic packaging material. It has a friendly advantage.

Description

Field-laying elastic packaging materials for children's play facilities {ELASTIC PAVEMENT MATERIALS FOR FIELD PAVING ON CHILDREN'S PLAYGROUND FACILITIES}

The present invention relates to an on-site laying-type elastic packaging material for children's play facilities, and more particularly, it has excellent bonding properties between the lower layer and the upper layer laid on the concrete base layer, has excellent impact relief effect and durability, and the lower layer is made of synthetic rubber chips or binders. It relates to an on-site laying-type elastic packaging material for children's play facilities that is harmless to the human body and is environmentally friendly by containing activated carbon that effectively adsorbs the generated organic solvent and harmful gas.

Children's playground equipment refers to a place installed outdoors so that children can use it safely and comfortably.Safety is required, such as having good shock absorption rate and not slippery so that children can fall away from the playground equipment and prevent safety accidents in advance. First of all. Accordingly, the conditions for providing the elastic packaging material installed on the floor are required for characteristics such as optimum walking feeling and shock absorption, durability and weather resistance, ease of maintenance and maintenance, and environmentally friendly materials.

In addition to the above-described children's play facilities, an elastic pavement material having a predetermined cushion is installed on the top of the base layer paved with concrete, asphalt, etc. in the park trails, sidewalks and bicycle paths, and various sports facilities. It is a rubber material of a predetermined thickness that can be put in various colors and patterns in consideration of aesthetics, and it is placed on the upper part of the base layer by mixing a rubber-based elastic material with a binder and finished construction to mitigate the impact on the human body. Recently, the use of composite materials made of waste tire chips or recycled rubber chips to polyurethane chips or EPDM (Ethylene Propylene Diene Monomer Chip) chips, and the entire surface of which is constructed as an elastic packaging material is increasing.

However, the conventional elastic packaging material has the effect of preventing safety accidents by providing sufficient elasticity to the floor so that pedestrians can feel good walking and alleviate the impact. However, in terms of recycling resources, waste tire chips or recycled rubber chips, etc. Materials such as volatile organic compounds (VOCs), which are harmful to the human body, are released from recycled materials or EPDM chips, which are harmful to the human body. In particular, when the temperature is high, the amount of emission increases.

In addition, the elastic packaging material made by bonding heterogeneous composite materials such as polyurethane chips, EPDM chips, waste tire chips, recycled rubber chips, etc., has low mutual adhesiveness and is easily broken or damaged by external impacts during use after being packaged on the floor. There is this difficult problem, and the adhesion is weakened over time, and due to the phenomenon that the chips are separated into powder and scattered, proper elasticity cannot be maintained, so there is a limit that is not good for safety and hygiene environment.

In some cases, natural rubber, which is harmless to the human body, was used for these elastic packaging materials.However, compared to synthetic rubber, natural rubber is exposed to double bonds, resulting in reduced durability due to chemical impacts such as ultraviolet rays and acid rain. A lot of waste tire rubber mats and blocks that are mixed and compression molded are used.

Recently, a synthetic rubber EPDM chip and urethane binder are stirred and used on the floor of children's playgrounds, etc., by directly laying and hardening. These EPDM rubber chips are diverse and can be expressed brightly, have excellent color stability, and are physicochemical. It has strong durability against phosphorus impact. However, EPDM, which is a major elastic material, is artificially synthesized from petrochemical and is not a completely eco-friendly material. However, as petroleum resources are depleted, the price is gradually increased, so that the proper amount of EPDM chips required for the site cannot be used. .

Looking at the aspect of the elastic packaging material previously developed to improve the above problems, Korean Patent Registration No. 10-0754424 (Join Zone Co., Ltd.) has antibacterial and deodorizing properties by mixing waste rubber chips manufactured with waste tires, etc. Regarding an elastic flooring material having a function and its manufacturing method and construction method, the waste rubber chips manufactured by finely pulverizing waste tires or waste rubber, and the powder and a binder manufactured by finely pulverizing phyllite are uniformly mixed and formed into a molding machine. It is safe and hygienic because it has shock absorbing power and anti-slip function, and has excellent physical and chemical performance such as abrasion resistance and durability, and has excellent antibacterial and deodorizing functions, and has excellent far-infrared radiation rate and negative ion emission rate. It is disclosed that it is an environmentally friendly elastic flooring material that effectively utilizes waste resources and can be used in various ways such as playgrounds, sports facilities, livestock flooring or sidewalk blocks.

In addition, the registration patent No. 10-0949125 (Dail Co., Ltd.) is a mixture of a first binder and a first elastic chip 102 having a size of 25 to 45 mm and laid on the upper side of the ground surface 10 to form the lower layer 100. The lower layer laying step (S10); A lower layer curing step (S20) in which the first binder of the lower layer 100 is cured in the lower layer laying step (S10); An upper layer laying step in which a second binder and a second elastic chip 202 having a size of 1 to 4 mm are mixed and laid on the upper side of the lower layer 100 cured in the lower layer curing step S20 to form the upper layer 200 ( S30); And an upper layer curing step (S40) in which the second binder of the upper layer 100 is cured in the upper layer laying step (S30), and in the lower layer laying step (S10), the first binder contains 3 to 10% by weight and The first elastic chip 102 is a safety flooring construction method of a playground, characterized in that it is mixed in an amount of 90 to 97% by weight, which will slightly improve the drainage of the flooring material itself, but between layers due to poor hardening process of the lower layer and the upper layer. It is confirmed that there is a problem in bonding properties.

In addition, in the same registration patent No. 10-1084364 (Semun Co., Ltd.), the work preparation step of leveling the auxiliary base layer such as aggregate located on the upper surface of the work area, and the upper part of the auxiliary base layer in the work area after completing the preparation work. The non-woven fabric installation step of spreading the non-woven fabric on the side, and 5 to 10 mm of waste clothing pulverized material prepared in advance on the upper surface of the non-woven fabric and waste tire chips having a particle diameter of 4 to 10 mm are put into a mixer, and the two-stage auxiliary permeable elastic layer (16) A two-stage auxiliary permeable elastic layer laying step in which a two-stage auxiliary permeable elastic layer (16) is installed by introducing and mixing the content of the urethane resin binder in a weight ratio of 15 to 25% relative to the total weight of the waste clothing pulverized material and waste tire chips of ). Wow, on the upper surface of the second-stage auxiliary water permeable elastic layer 16, a waste tire chip crushed into a particle size of 2 to 3 mm is laid. The thickness ratio is 50% of the second-stage auxiliary water-permeable elastic layer 16, and the content of the urethane resin binder is The upper elastic layer laying step of laying the upper elastic layer 18 mixed by adding 15 to 19% by weight of the total weight of the elastic layer, and the EPDM color chip cut into 2 to 4 mm size on the upper surface of the upper elastic layer. It is used, and a water-permeable elastic flooring material comprising an upper layer laying step of laying the upper layer 20 in which a urethane binder is added and mixed in an amount of 18 to 22% of the total weight of the upper layer, and a curing step of curing the upper layer. Although a construction method has been developed, the construction method has problems in the process of installing the nonwoven fabric on the upper surface of the sub-base layer and secondary environmental pollution.

And in the same publication patent No. 10-2011-0138451 (SCR, Inc.), a foundation layer provided with any one selected from concrete, permeable cone, and asphalt concrete laid on the upper surface of the stratum at a certain thickness, a primer layer applied on the foundation layer, and , A waste tire chip layer (recycled rubber chip) adhered to the upper surface of the primer layer with a certain thickness, and a surface layer selected from among urethane chips and EPDM chips (color chips) on the upper surface of the waste tire chip layer (recycled rubber chip). In the floor structure of a children's playground, the primer layer and the waste tire chip layer (recycled rubber chip) are formed of an individual having a predetermined thickness and cut to a predetermined size in all directions, so that one individual contacts one side of any one or more other objects. Disclosed is a children's playground floor structure using PE foam, characterized in that it further includes a PE foam layer that is bonded with a sealing material when it is formed, and it does not absorb water unlike the prior art by replacing it with PE foam (POLY ETHYLENE FOAM). Although water resistance is strong, it is investigated that there is a disadvantage in durability due to the characteristics of the PE foam material.

On the other hand, in the present invention, as a result of a thorough analysis of the problems related to durability and environment-friendliness of the existing elastic packaging material, a lower layer composed of SBR (Styrene-Butadiene Rubber) chips and an upper layer composed of EPDM (Ethylene Propylene Diene Monomer) chips on the concrete base layer were prepared. As an elastic packaging material formed by laying, the particle size of the SBR chip and EPDM chip is adjusted to prevent interlayer separation, while the lower layer contains activated carbon, thereby preventing organic solvents and harmful gases from deteriorating the physical properties of the elastic packaging material. We developed a field-laying elastic packaging material for children's play facilities that is effectively adsorbed and is environmentally friendly.

Korean Registered Patent Publication No. 10-0754424 (announced date August 31, 2007) Korean Registered Patent Publication No. 10-0949125 (announced on March 25, 2010) Korean Registered Patent Publication No. 10-1084364 (Notification date 2011/11/16) Republic of Korea Patent Publication No. 10-2011-0138451 (published on December 28, 2011)

An object of the present invention is to adjust the particle size and set the thickness of the material of the lower layer composed of SBR (Styrene-Butadiene Rubber) chip and urethane binder, and the upper layer composed of EPDM (Ethylene Propylene Diene Monomer) chip and urethane-based binder, and the bonding strength between upper and lower layers resulting therefrom It provides an elastic packaging material that does not cause separation between layers and has excellent durability while maintaining uniform elasticity and has excellent impact damping function by analyzing the correlation. In addition, activated carbon for effectively adsorbing organic solvents and harmful gases in the lower layer ( Activated Carbon) effectively adsorbs organic solvents and harmful gases without deteriorating the properties of the elastic packaging material itself, providing an environment-friendly on-site elastic packaging material for children's play facilities.

The field-laying elastic paving material for children's play facilities according to the present invention is a urethane primer with an isocyanate group (-NCO) content of 3.5 to 5.0%, a specific gravity of 0.90 to 1.10, a non-volatile content of 40 to 80%, and a viscosity of 300 cP or less on the surface of the concrete base layer. Primer) is applied, and a lower layer composed of SBR (Styrene-Butadiene Rubber) chips and a urethane binder is laid on the upper surface of the urethane primer, and then an upper layer composed of EPDM (Ethylene Propylene Diene Monomer) chips and a urethane-based binder is laid on the upper surface of the lower layer. In the elastic packaging material formed as described above, the lower layer contains within 1 to 10 parts by weight of activated carbon based on 100 parts by weight of the lower layer material to adsorb organic solvents and harmful gases.

According to a preferred embodiment of the present invention, the SBR (Styrene-Butadiene Rubber) chip used in the lower layer has a particle size of 5 to 7 mm, and the SBR chip and the urethane-based binder have a weight ratio of 100: 13 to 18. It is mixed, and the activated carbon contained in the lower layer is characterized in that it is a granulated carbon having a diameter of 1 to 4 mm.

In addition, the EPDM (Ethylene Propylene Diene Monomer) chip used in the upper layer has a particle size of 2 to 3 mm, and the EPDM chip and the urethane binder are mixed in a weight ratio of 100: 18 to 25, and the upper layer is colored It is characterized in that the color is expressed by using an EPDM chip or by adding 1 to 3 parts by weight of a coloring pigment based on the total amount of the upper layer material.

In addition, the lower layer is laid with an average thickness of 30 to 100 mm, and the upper layer is laid with an average thickness of 10 to 20 mm.

The construction method of the on-site laying-type elastic pavement material for children's play facilities includes the steps of finishing the surface of the concrete base layer and installing a drain hole (S100); Applying a urethane primer to the surface of the concrete base layer within 0.3 kg/m 2 ± 3% (S200); After mixing 1 to 10 parts by weight of activated carbon with respect to 100 parts by weight of SBR (Styrene-Butadiene Rubber) chips and urethane binder and stirring for 5 minutes or more, the lower layer has an average thickness of 30 to 100 mm before the urethane primer is cured. The step of installing (S300); Primary compaction and flattening operation (S400); Mixing EPDM (Ethylene Propylene Diene Monomer) chips and a urethane binder, stirring for at least 5 minutes, and then laying an upper layer with an average thickness of 10 to 20 mm on the upper surface of the lower layer (S500); It consists of a step (S600) of the second compaction and flattening operation.

The field-laying elastic packaging material for children's play facilities of the present invention is an SBR chip and an SBR chip in order to improve the bonding strength between the lower layer made of SBR (Styrene-Butadiene Rubber) chip and urethane binder, and the upper layer made of EPDM (Ethylene Propylene Diene Monomer) chip and urethane binder. By controlling the particle size of the EPDM chip and setting the appropriate thickness of the upper and lower layers, it has excellent impact relief function and maintains uniform elasticity, and has excellent durability without interlayer separation.

In addition, since the lower layer of the elastic packaging material contains activated carbon for effectively adsorbing organic solvents and harmful gases, it effectively adsorbs volatile organic solvents and harmful gases without deteriorating the physical properties of the elastic packaging material. It has a friendly advantage.

1 is a block diagram of an on-site installation type elastic packaging material for children's play facilities according to the present invention.
Figure 2 is a flow chart showing the construction method of the field installation type elastic packaging material for children's play facilities according to the present invention.

Hereinafter will be described with respect to the field-laying type elastic packaging material for children's play facilities according to the present invention, which is intended to illustrate to the extent that a person of ordinary skill in the art to which the present invention belongs can easily implement the invention, This does not mean that the technical spirit and scope of the present invention are limited.

As shown in FIG. 1, the on-site laying-type elastic packaging material for children's play facilities according to the present invention is applied with a urethane primer (20) on the surface of the concrete base layer (10), and the upper surface of the urethane primer (20) After laying the lower layer 30 made of SBR (Styrene-Butadiene Rubber) chips and urethane binder, the upper layer 40 made of EPDM (Ethylene Propylene Diene Monomer) chip and urethane binder was laid on the upper surface of the lower layer 30 In the formed elastic packaging material, the lower layer 30 contains within 1 to 10 parts by weight of activated carbon based on 100 parts by weight of the lower layer material to adsorb organic solvents and harmful gases.

First, the elastic packaging material of the present invention applies a urethane primer (20) to the surface of the concrete base layer (10) to reinforce the crack of the concrete base layer (10) and reinforce the bonding property with the lower layer (30), The primer is preferably a one-component moisture-curable urethane-based, low-viscosity urethane-based resin having excellent penetration and elasticity in consideration of workability and storage, and the urethane primer 20 used in the present invention is an isocyanate group ( -NCO) content of 3.5% or more (5.0% or less), specific gravity of 0.90 or more (1.10 or less), non-volatile content of 40% or more (80% or less), and viscosity of 300cP or less are selected and applied. There was no problem at all.

Next, an SBR (Styrene-Butadiene Rubber) chip and a lower layer 30 made of a urethane binder are laid on the upper surface of the urethane primer 20, and the SBR chip used for the lower layer 30 has a particle size of 5 to 7 mm. It is possible to prevent interlayer separation from the upper layer 40 without decreasing elasticity for a long period of time, and the SBR chip and the urethane-based binder are mixed in a weight ratio of 100: 13 to 18, so that the elasticity of the elastic packaging material is within a suitable range. While maintaining it, strong adhesion between SBR chips can be secured.

The SBR is a kind of synthetic rubber obtained by copolymerization of styrene and butadiene. Compared to natural rubber, it has poor cold resistance and elasticity, but has excellent heat resistance, abrasion resistance, aging resistance, water resistance, and gas permeability, and is inexpensive and hard even after long use. It is widely used for tires, shoe soles, hoses, belts, packings, etc., and the SBR chips used in the present invention are used to remove scraps or waste products (waste tires, etc.) that are discarded after processing virgin resin or SBR products. Of course, it is possible to use chips that are recycled and finely crushed to a particle size of 5 to 7 mm.

The lower layer 30 contains activated carbon in the range of 1 to 10 parts by weight based on 100 parts by weight of the lower layer material in order to adsorb organic solvents and harmful gases contained in the SBR itself or a binder, and the activated carbon The use of granulated carbon with a diameter of 1 to 4 mm is most effective for adsorption of harmful substances by activated carbon particles impregnated in the lower layer 30, and granular activated carbon or powdered activated carbon with such a particle size of 1 to 4 mm Compared to that, it has excellent dispersibility in the material of the lower layer, so the adsorption performance can be maximized. The granulated coal has a specific gravity of 1.9 to 2.2, an ash content of 2 to 5%, a specific surface area of 900 to 1200 m 2 /g, and a pore volume of 0.6 to 1.2 cc/g.

The general form of activated carbon is a crushed form of an irregular shape with a particle size of 3 to 80 mesh, a powder form with a particle size of 100 mesh or less, a spherical shape of a certain standard size, a cylindrical shape (assembly), and a fiber form mainly used for medicine. The activated carbon is nonpolar, that is, hydrophobic, which dislikes water because there is no oxidizer and inorganic impurities on the surface, and therefore, in the present invention, in consideration of miscibility and dispersibility in the lower layer 30, the lower layer material 100 The content in the range of 1 to 10 parts by weight based on parts by weight is suitable for exhibiting adsorption performance without deteriorating the physical properties of the lower layer 30.

The activated carbon is a material in which the surface area is increased by using chemicals such as water vapor or phosphoric acid in charcoal, and it is an aggregate of well-developed amorphous carbon made of wood, lignite, anthracite and coconut shells as raw materials. , It is an adsorbent that has a large internal surface area because micropores of molecular size are well formed during the activation process. This adsorbent has a surface area of 1,000 m2 or more per gram, and has a property of adsorbing molecules of a substance to be adsorbed by applying attractive force to the surrounding liquid or gas by the functional groups of carbon atoms present on the surface.

This activated carbon is an irregular layered lattice structure having a non-uniform arrangement of regular hexagons, and is a composite form of a space lattice type in which carbon hexagons are cross-connected and a lattice structure type in which a network surface is irregularly arranged in parallel. Its properties are known to have a high adsorption ability for organic molecules, as well as a well-developed micropore, a very large effective surface area, and excellent physical, thermal, and mechanical strength. The present invention was completed by focusing on the fact that an environmentally friendly elastic packaging material can be obtained.

Since the activated carbon is a non-hydrophilic adsorbent, a material having less affinity with water has a greater tendency to adsorb it, and a material having a greater affinity with water has a lower tendency to adsorb it. Due to this tendency, activated carbon adsorbs materials with large molecular weight and non-hydrophilicity and small polarity. In other words, activated carbon tends to selectively adsorb components with high saturation, no unsaturation, high freezing point and low solubility in water. Activated carbon having such characteristics is capable of adsorbing and removing carbohydrates in wet air and organic matter in water.

Finally, on the upper surface of the lower layer 30, an upper layer 40 made of an EPDM (Ethylene Propylene Diene Monomer) chip and a urethane-based binder is laid to form an elastic packaging material. EPDM refers to an ethylene-propylene double bond monomer and is extracted from crude oil. It is produced by solution polymerization as a by-product, and is chemically stable and vulcanized because its physical properties are intermediate between natural rubber and SBR and are not easily oxidized, so it is used in automobile parts, civil engineering and construction fields, and industrial fields that require durability. It is used in various ways.

EPDM has excellent stability to maintain initial physical properties for more than 20 years even when exposed to ultraviolet rays and ozone, and is an economical material replacing urethane with limited color recently, and has excellent ozone resistance, cold resistance, heat resistance, and solvent resistance. It has good color stability and is widely used as an elastic packaging material requiring a variety of colors, but the material cost is rather expensive.

It is preferable that the EPDM chip used for the upper layer 40 has a particle size of 2 to 3 mm. For this reason, the EPDM chip used for the lower layer 30 is arranged in a sequential particle size arrangement with the SBR chip having a particle size of 5 to 7 mm. As a result, the shock generated from the upper part of the elastic packaging material is quickly transmitted to the lower part or the periphery, so that the shock absorbing function for the human body can be exhibited very effectively, and the upper part (40) chip is interlocked with the lower part part (30) chip like a cogwheel, making it a more robust combination. It is effective in improving the durability of elastic packaging materials by showing properties.

In addition, the EPDM chip and the urethane binder are mixed in a weight ratio of 100: 18 to 25, so that strong adhesion between the EPDM chips can be secured, and the touch (walking feeling) of the surface of the elastic packaging material is excellent, as well as with the lower layer 30. The interfacial bonding strength is improved, and the upper layer 40 formed as described above not only maintains uniform elasticity, but also has adequate water permeability, and does not cause separation between layers with the lower layer 30 even when used for a long period of time, and has durability. Excellent.

In addition, since the EPDM chip has good color stability and has little discoloration, a colored EPDM chip may be used or a specific color may be expressed on the surface of the elastic packaging material by adding about 1 to 3 parts by weight of a colored pigment based on the total amount of the upper layer material. It is possible to use various kinds of eco-friendly inorganic pigments that do not contain toxic elements such as Cd, Cr, Pb, Se, etc. for the kind of coloring pigment, and if it does not seriously impair the physical properties of EPDM chips, There are no special restrictions.

Such an on-site laying-type elastic packaging material for children's play facilities can implement a suitable buffering action by laying the lower layer 30 with an average thickness of 30 to 100 mm and the upper layer 40 with an average thickness of 10 to 20 mm. If the construction thickness of 30) is less than 30mm, it is difficult to expect a sufficient buffering action, and if it exceeds 100mm, the repulsive elastic force is excessively generated, making it difficult to quickly disperse the impact on the upper part of the elastic packaging material from the child's body over the entire surface. Not only is it a bit uncomfortable to move, but there is also a concern that the impact of a fall may increase. In addition, the upper layer 40 is installed with a construction thickness of 10 to 20 mm to complement the physical and chemical properties of the lower layer 30, while reducing the material cost of the EPDM chip and preventing interlayer separation, thereby forming an elastic packaging material with excellent quality. .

The urethane binder used in the lower layer 30 and the upper layer 40 is not particularly limited in specific types, but in the present invention, an isocyanate group (-NCO) content of 5.5% or more (8.0% or less) and a specific gravity of 0.90 or more (1.10) Below), by using a product with a nonvolatile content of 93% or more and a viscosity of 2,500 cP or more, the adhesion between chips is excellent, and the polyol used as the main material is optionally selected from polypropylene glycol and polyoxypropylene triol having a weight average molecular weight of 2,000 to 3,000. Includes, and the diisocyanate used as a curing agent includes any one selected from toluene diisocyanate, diphenylmethane diisocyanate, and isopropyl diisocyanate. The urethane binder is known as an eco-friendly adhesive compared to epoxy-based, acrylic-based, silicone-based, sulfide-based, ester-based, phenol-based, olefin-based, imide-based, rubber-based, acrylate-based, and polyene-based.

As shown in Figure 2, the construction method of the on-site laying-type elastic packaging material for children's play facilities according to the present invention comprises the steps of finishing the surface of the concrete base layer 10 and installing a drain hole (S100); On the surface of the concrete base layer 10, a urethane primer (20) with an isocyanate group (-NCO) content of 3.5 to 5.0%, a specific gravity of 0.90 to 1.10, a non-volatile content of 40 to 80%, and a viscosity of 300 cP or less is 0.3 kg/㎡ Applying within ±3% (S200); Coarse pellets with a diameter of 1 to 4 mm per 100 parts by weight of the material of the lower layer 30, which is a mixture of SBR (Styrene-Butadiene Rubber) chips having a particle size of 5 to 7 mm and a urethane binder in a weight ratio of 100: 13 to 18 After mixing 1 to 10 parts by weight of activated carbon and stirring for 5 minutes or more, laying the lower layer 30 to an average thickness of 30 to 100 mm before the urethane primer 20 is cured (S300); Primary compaction and flattening operation (S400); After mixing EPDM (Ethylene Propylene Diene Monomer) chips having a particle size of 2 to 3 mm and a urethane binder in a weight ratio of 100: 18 to 25, stirring for 5 minutes or more, an average of 10 to 20 on the upper surface of the lower layer 30 Laying the upper layer 40 to a thickness of mm (S500); It consists in the order of the step (S600) of the second compaction and flattening operation.

The first process is a step (S100) of finishing the surface of the concrete base layer 10 and installing a drain hole.After confirming the curing condition of the concrete base layer 10, foreign substances are removed and there is no slope and level defect. The surface finish condition of the base layer 10 must be within 1 to 3% of the inclination to achieve adequate drainage in rainy weather and meet the safety as a children's playground, and a drain (or collection pipe) is installed at the bottom to prevent water retention. And after connecting to the sewer pipe, elastic packaging material should be installed. In the case of a urethane binder, it is preferable not to install when the relative humidity of the installation environment is 85% or more, and the temperature of the base layer surface is 5℃ or less or 40℃ or more, considering workability and quality.

The second process is a step (S200) of applying a urethane primer 20 to the surface of the concrete base layer 10 within 0.3 kg/㎡±3% (S200), and the urethane primer 20 is a roller or air spray, etc. The coating is uniformly applied, and a detailed description thereof will be omitted.

In the third step, after mixing 1 to 10 parts by weight of activated carbon with respect to 100 parts by weight of SBR (Styrene-Butadiene Rubber) chip and urethane binder, stirring for 5 minutes or more, the average before the urethane primer 20 is cured. As the step of laying the lower layer 30 with a thickness of 30 to 100 mm (S300), a speed of about 35 to 55 rpm using a cylindrical low-speed stirrer so that the urethane binder is well coated on the completely dried SBR chip and the activated carbon is completely dispersed. By stirring with and laying the lower layer 30 before the urethane primer 20 is cured, the primer is cured and the adhesion with the lower layer 30 is improved.

The fourth process is the first compaction and flattening step (S400), and the compaction and flattening operation for the lower layer 30 is generally a heating roller having a surface temperature of 100°C or higher and a weight of about 10 kg. When using, the workability is excellent, and the surface temperature of the roller is preferably 160°C or less in summer and 200°C or less in winter.

The fifth process is a step of mixing EPDM (Ethylene Propylene Diene Monomer) chips and a urethane binder, stirring for 5 minutes or more, and then laying the upper layer 40 with an average thickness of 10 to 20 mm on the upper surface of the lower layer 30 (S500). As a result, the upper layer 40 not only maintains uniform elasticity, but also has adequate water permeability, does not cause separation between layers with the lower layer 30, and has excellent durability, and the upper layer 40 has a colored EPDM. It goes without saying that a beautiful color may be expressed on the surface of the elastic packaging material by using chips or by adding 1 to 3 parts by weight of a colored pigment based on the total amount of the upper layer material.

The sixth process is a second compaction and flattening step (S600). The compaction and flattening of the upper layer 40 is performed by using a heating roller having a surface temperature of 100°C or higher and a weight of about 20 kg. By using it, it is possible to secure the adhesion of the chip itself as well as strong bonding with the lower layer 30. This is similar to the fourth process, where the surface temperature of the roller is 160°C or less in summer and 200°C or less in winter. Carrying out compaction and leveling operations can improve the quality of the elastic packaging material.

The field-laying elastic packaging material for children's play facilities constructed by the above construction method is a combination of the SBR chip of the lower layer 30 and the EPDM chip of the upper layer 40 bonded with an eco-friendly urethane binder in a suitable particle size, resulting in good interfacial bonding for a long time. Even when using, it is possible to prevent children's safety accidents as much as possible by absorbing the shock generated from the upper part of the elastic packaging material quickly without causing separation between layers, and to prevent safety accidents of children as much as possible, but also to have a very good walking feeling and anti-slip function. In addition, since it is an environmentally friendly material that does not contain any harmful substances, it can fundamentally prevent damage to children caused by heavy metals.

In addition, the elastic packaging material has low thermal conductivity, so that snow melts quickly in winter and blocks radiant heat in summer.In particular, by adding activated carbon to the lower layer 30, sulfur, styrene, and sulfur emitted from recycled SBR chips, along with adsorption of organic solvents and harmful gases, It can also effectively remove odors such as VOCs.

Hereinafter, an experiment of an on-site laying-type elastic packaging material for a children's play facility according to the present invention will be described, but a preferred embodiment capable of being easily understood and implemented by a person of ordinary skill in the art will be described. The present invention will be described through.

[Example]

(Finish the surface of the concrete base layer and install drains)

The surface slope of the concrete base layer was within 1 to 3%, and a number of drainage holes were installed from the top to the bottom of the concrete base layer.

(Primer application and lower layer installation)

After applying a urethane primer (Urethane Primer) about 0.3 kg/㎡ to the surface of the concrete base layer, SBR chips and urethane binders having a particle size of 5 to 7 mm are added to the upper surface of the urethane primer in a weight ratio of 100: 13 to 18. After mixing, a lower layer of 1 to 10 parts by weight of granulated carbon (activated carbon) having a diameter of 1 to 4 mm was added thereto to have an average thickness of 30 to 100 mm.

(1st compaction and leveling work)

Compaction and flattening operations were performed on the laid lower layer using a heating roller having a surface temperature of about 100 to 110°C and weighing 10 kg.

(Installation of the upper layer)

On the upper surface of the lower layer, an upper layer formed by mixing an EPDM chip having a particle size of 2 to 3 mm and a urethane-based binder at a weight ratio of 100: 18 to 25 was laid with an average thickness of 10 to 20 mm.

(2nd compaction and flattening work)

The laid upper layer was compacted and flattened using a heating roller having a surface temperature of about 100 to 110°C and a weight of 20 kg to form an elastic packaging material.

[Experimental Example]

In the elastic packaging material according to the above embodiment, a 500×500 mm-sized mold is separately installed within the boundary of the construction site so that the test piece for on-site installation can be collected, a release film is laid on it, and after installation under the same conditions as the on-site installation, compaction and The flattening operation was carried out. After removing the mold, the specimen was hardened at room temperature for 7 days, and the physical properties such as tensile strength, elongation, tensile stress, hardness, compressive stress, compressive strain fracture, flexural creep strain fracture, and sliding resistance were measured several times as follows. , The average values for the test results are shown in [Table 1].

○ Tensile strength: Measured by the method of 5. in KS M 6518, and the tensile strength and elongation are obtained by the following equation.

-Tensile strength: Tb(MPa) = Fb/A [Fb: maximum load (N), A: cross-sectional area of test piece (㎟)]

-Elongation rate: Eb(%) = (L1-L0)/L0 ×100 [L0: mark distance (mm), L1: length between marks when cut (mm)]

○ Tensile stress: measured by the method according to KS M 6518.

○ Hardness: According to the durometer hardness test method of KS M 7619-1, at this time, 5 places are measured according to the type AO durometer test method, and the average value of the measured values is displayed.

○ Compression stress and compression deformation: Compressive stress is in accordance with KS M ISO 3386-1, and compression deformation failure determines whether or not the side is destroyed after 30% deformation.

○ Flexural Creep Deformation Destruction: Determine the radius of the pressurizing rod and support according to KS M ISO 178, and the test speed is 20㎜/min. According to KS M ISO 899-2, a load of 200N or a deformation of 100mm is generated on the test piece and maintained for 5 minutes. After that, the load is removed and the bottom fracture and interlayer separation are determined after 30 minutes.

○ Sliding resistance: Measured in the field by the wet method according to KS F 2375.

Test Items Lower layer Upper layer Thickness(mm) 30 100 10 20 Tensile strength (MPa) - - 0.67 0.75 Elongation(%) - - 72 66 Tensile stress (MPa) - - 0.58 0.72 Hardness - - 52 49 Compressive stress (MPa) 0.45 0.42 - - Compression deformation clear clear - - Flexural Creep Deformation Destruction No bottom break, no delamination Sliding resistance (BPN, when wet) - - 46 48

As shown in [Table 1], the on-site laying-type elastic packaging material for children's play facilities of the present invention includes a lower layer made of SBR (Styrene-Butadiene Rubber) chips and a urethane binder, and an upper layer made of EPDM (Ethylene Propylene Diene Monomer) chips and a urethane-based binder. All tests including tensile strength, elongation, tensile stress, hardness, compressive stress, compressive deformation failure, flexural creep deformation failure, sliding resistance, etc. by adjusting the particle size of the SBR chip and EPDM chip and setting the appropriate thickness of the upper and lower layers to improve the adhesion of In addition, by containing an appropriate amount of activated carbon to effectively adsorb organic solvents and harmful gases in the lower layer, it effectively adsorbs volatile organic solvents and harmful gases without deteriorating the physical properties of the elastic packaging material. It is harmless to the human body and can be expected to be environmentally friendly.

Therefore, the field-laying-type elastic paving material for children's play facilities according to the present invention can be variously substituted, modified, and changed within the scope of the technical idea of the present invention, such as children's playgrounds, park trails, sidewalks and bicycle paths, and various sports. As an eco-friendly flooring material in all fields that require characteristics such as cushioning, walking, water permeability, and sound-absorbing properties like facilities, it can be constructed in various forms.

10: concrete base layer
20: urethane primer
30: lower layer (SBR chip + urethane binder + activated carbon)
40: upper layer (EPDM chip + urethane binder)

Claims (7)

On the surface of the concrete base layer 10, an isocyanate group (-NCO) content of 3.5 to 5.0%, a specific gravity of 0.90 to 1.10, a non-volatile content of 40 to 80%, and a urethane primer (20) having a viscosity of 300 cP or less were applied,
On the upper surface of the urethane primer 20, a lower layer 30 formed by mixing SBR (Styrene-Butadiene Rubber) chips having a particle size of 5 to 7 mm and a urethane binder at a weight ratio of 100: 13 to 18 was laid,
Elasticity formed by laying an upper layer 40 formed by mixing an EPDM (Ethylene Propylene Diene Monomer) chip having a particle size of 2 to 3 mm and a urethane binder at a weight ratio of 100: 18 to 25 on the upper surface of the lower layer 30 In the packaging material,
The lower layer 30 is characterized in that it contains within 1 to 10 parts by weight of activated carbon made of granulated carbon having a diameter of 1 to 4 mm based on 100 parts by weight of the lower layer material to adsorb organic solvents and harmful gases. On-site installation type elastic packaging material for children's play facilities. delete delete delete The method of claim 1,
The upper layer 40 uses a colored EPDM (Ethylene Propylene Diene Monomer) chip or adds 1 to 3 parts by weight of a colored pigment based on the total amount of the upper layer material to express color. . The method according to any one of claims 1 and 5,
The lower layer 30 is laid with an average thickness of 30 to 100 mm, and the upper layer 40 is laid with an average thickness of 10 to 20 mm. Finishing the surface of the concrete base layer 10 and installing a drain hole (S100);
On the surface of the concrete base layer 10, a urethane primer (20) with an isocyanate group (-NCO) content of 3.5 to 5.0%, a specific gravity of 0.90 to 1.10, a non-volatile content of 40 to 80%, and a viscosity of 300 cP or less is 0.3 kg/㎡ Applying within ±3% (S200);
Coarse pellets with a diameter of 1 to 4 mm per 100 parts by weight of the material of the lower layer 30, which is a mixture of SBR (Styrene-Butadiene Rubber) chips having a particle size of 5 to 7 mm and a urethane binder in a weight ratio of 100: 13 to 18 After mixing 1 to 10 parts by weight of activated carbon and stirring for 5 minutes or more, laying the lower layer 30 to an average thickness of 30 to 100 mm before the urethane primer 20 is cured (S300);
Primary compaction and flattening operation (S400);
After mixing EPDM (Ethylene Propylene Diene Monomer) chips having a particle size of 2 to 3 mm and a urethane binder in a weight ratio of 100: 18 to 25, stirring for 5 minutes or more, an average of 10 to 20 on the upper surface of the lower layer 30 Laying the upper layer 40 to a thickness of mm (S500);
Secondary compaction and flattening operation (S600);
Construction method of the on-site installation type elastic packaging material for children's play facilities, characterized in that consisting of.

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