KR102827791B1 - Method for manufacturing and constructing environmentally friendly shock-absorbing flooring for children's play facilities - Google Patents

Abstract

The present invention relates to a method for manufacturing and constructing an environmentally friendly shock-absorbing flooring material for children's play facilities, and more specifically, to an environmentally friendly shock-absorbing flooring material for children's play facilities and a method for constructing the same.
The shock-absorbing flooring material according to the present invention comprises a lower elastic layer in which 13 to 33 parts by weight of desulfurized recycled rubber recycled by desulfurizing vulcanized rubber, 67 to 87 parts by weight of non-vulcanized recycled rubber, 21 to 42 parts by weight of vulcanized finely divided rubber, 190 to 250 parts by weight of calcium carbonate, 0.2 to 0.4 parts by weight of water, 1 to 2 parts by weight of zinc oxide, 5 to 10 parts by weight of a rubber softener, 1 to 2 parts by weight of stearic acid, 1 to 2 parts by weight of wax, 1 to 2.5 parts by weight of sulfur, and 0.4 to 2 parts by weight of a vulcanization accelerator are mixed and foamed to obtain foamed first rubber chips having a diameter of 1 to 10 mm, crushed aggregate having a particle size of 1 to 10 mm, recycled foamed chips recycled from foamed EVA and/or PE or other synthetic rubber resins, and a binder are mixed and laid.

Description

{Method for manufacturing and constructing environmentally friendly shock-absorbing flooring for children's play facilities}

The present invention relates to a method for manufacturing and constructing an environmentally friendly shock-absorbing flooring material for children's play facilities, and more specifically, to an environmentally friendly shock-absorbing flooring material for children's play facilities and a method for constructing the same.

As one way to reduce environmental pollution caused by waste generation, the method of crushing/crushing waste resources such as tires or shoe soles and recycling them into shock-absorbing flooring materials is widely used.

However, when crushing tires for recycling purposes and using them in the lower elastic layer, there are concerns that the various additives that were added to enhance the functionality such as wear resistance of the product, as well as hazardous chemicals that accumulate when exposed to the external environment such as roads for a long period of time, may come into contact with the human body. Therefore, the government has established group standards and the Korea Agency for Technology and Standards has presented environmental standards. However, issues are being raised intermittently, and the environmental standards are gradually being strengthened.

Accordingly, a method is being proposed to minimize the impact on the human body by using recycled rubber chips derived from crushed waste tires, which have relatively excellent elasticity and physical properties, for the lower surface, and EPDM rubber chips or cork chips based on natural materials for the upper surface that comes into direct contact with the human body.

Korean Patent Publication No. 10-2020-0117237 proposes a shock-absorbing flooring material for a children's playground, comprising an upper elastic layer including EPDM elastic chips with relatively high environmental safety, and a lower elastic layer including crushed recycled rubber chips from waste tires with excellent elasticity and physical properties, in order to minimize the environmental impact of the lower elastic layer, and discloses a method of mixing activated carbon into the lower layer so as to absorb organic solvents or harmful gases generated from waste tires.

However, there is ongoing demand from environmental authorities for new ways to overcome this, as environmental regulations are further strengthened in places such as children's playgrounds.

Accordingly, shock-absorbing flooring materials made of natural materials were released to improve environmental friendliness, but problems with durability deterioration occurred with long-term use, and they were not only vulnerable to shrinkage and expansion due to temperature changes, but were also vulnerable to moisture, causing problems with rotting and oxidation.

To compensate for this, there are cases where a shock-absorbing flooring material is manufactured by constructing a foam-type sheet made of polyethylene as a substitute for the lower elastic layer and then using natural materials as elastic only on the upper part. However, this has limitations in terms of use because it is difficult to attach to a curved base surface, and the ends of the foam-type sheets used as the lower elastic layer tend to roll up due to geothermal heat, and problems with durability and quality deterioration occur due to cracking at the joints and loss of the lifted elastic particles.

The problem to be solved by the present invention is to provide an environmentally friendly and elastic shock-absorbing flooring material for children's playgrounds that does not contain waste tires that contain or emit hazardous substances, as measures to restrict the use of materials that contain organic solvents or generate volatile organic compounds, such as recycled rubber chips from waste tires, in the lower elastic layer of children's playgrounds are being strengthened and implemented.

Another problem to be solved by the present invention is to provide a method for constructing a shock-absorbing flooring material for a children's playground that is environmentally friendly and has excellent elasticity, as it does not contain recycled rubber chips derived from waste tires that contain or emit hazardous substances.

Another problem to be solved by the present invention is to provide an environmentally friendly and elastic shock-absorbing flooring material that does not contain recycled rubber chips derived from waste tires that contain or emit hazardous substances, and to use the same in children's playgrounds or artificial grass fields.

In order to solve the above problems, the present invention

A foamed first rubber chip having a diameter of 1 to 10 mm, which is vulcanized by mixing and foaming 100 parts by weight of an unvulcanized rubber mixture comprising 13 to 33 parts by weight of desulfurized recycled rubber recycled by desulfurizing vulcanized rubber and 67 to 87 parts by weight of unvulcanized recycled rubber, 21 to 42 parts by weight of vulcanized micronized rubber, 190 to 250 parts by weight of calcium carbonate, 0.2 to 0.4 parts by weight of water, 1 to 2 parts by weight of zinc oxide, 5 to 10 parts by weight of a rubber softener, 1 to 2 parts by weight of stearic acid, 1 to 2 parts by weight of wax, 1 to 2.5 parts by weight of sulfur, and 0.4 to 2 parts by weight of a vulcanization accelerator, and:

Crushed aggregate with particle size of 1 to 10 mm;

Recycled foam chips made from recycled synthetic rubber resin series such as foamed EVA and/or PE; and

A shock-absorbing flooring material is provided, which includes a lower elastic layer including a binder.

The present invention, in one aspect,

A foamed first rubber chip having a diameter of 1 to 10 mm is manufactured by mixing and foaming 100 parts by weight of an unvulcanized rubber mixture comprising 13 to 33 parts by weight of desulfurized recycled rubber recycled by desulfurizing vulcanized rubber and 67 to 87 parts by weight of unvulcanized recycled rubber, 21 to 42 parts by weight of vulcanized finely divided rubber, 190 to 250 parts by weight of calcium carbonate, 0.2 to 0.4 parts by weight of water, 1 to 2 parts by weight of zinc oxide, 5 to 10 parts by weight of a rubber softener, 1 to 2 parts by weight of stearic acid, 1 to 2 parts by weight of wax, 1 to 2.5 parts by weight of sulfur, and 0.4 to 2 parts by weight of a vulcanization accelerator.

A method for manufacturing a shock-absorbing flooring material is provided, comprising the step of mixing and spreading the manufactured foamed first rubber chips with crushed aggregate, recycled foam chips made by recycling foamed EVA and/or PE, and a binder to form a lower elastic layer.

In the present invention, the lower elastic layer may contain 1 to 20 parts by weight of a binder with respect to 100 parts by weight of the lower elastic mixture composed of the foamed first rubber chips, crushed aggregate, and recycled foam chips, more preferably 2 to 15 parts by weight, and even more preferably 3 to 10 parts by weight.

In the present invention, the foamed first rubber chip forming the lower elastic layer is used to improve stability by compensating for the low specific gravity of the recycled foam chip and to provide appropriate elastic repulsive force and shock absorption, and may be used in an amount of 20 to 50 wt%, more preferably 25 to 45 wt%, and most preferably 30 to 40 wt%, based on 100 wt% of the total lower elastic mixture.

In practicing the present invention, if the content of the foamed first rubber chip is less than the above range, there is a concern that the rebound elasticity may be weakened, the weight ratio stability may decrease, and the joint strength of the joint portion may be weakened. In addition, if the content of the foamed first rubber chip exceeds the above range, the shock absorption performance may be degraded, and there may be no general difference from existing products, so that the goal of environmental friendliness to be achieved through recycling may be distant, and the cost for producing it may increase.

In the present invention, the desulfurized recycled rubber of the foamed first rubber chip is used in an environmentally friendly manner by recycling rubber that is conventionally incinerated as waste and causes air pollution, and refers to rubber that is collected by vulcanization and then desulfurized and recycled.

In the present invention, the desulfurized recycled rubber may be a desulfurized recycled EPDM rubber or BR rubber that is obtained by finely crushing vulcanized EPDM rubber and/or vulcanized BR rubber, and then decomposing it in a chamber by applying heat to break the vulcanization ring.

In one embodiment of the present invention, the desulfurized recycled EPDM rubber can be manufactured by desulfurizing EPDM weather strip by decomposing it in a screw-type chamber at 250 to 300° C. to break the vulcanization ring.

In practicing the present invention, the desulfurized recycled rubber may be used in an amount of 13 to 33 parts by weight, preferably 15 to 30 parts by weight. If the content of the desulfurized recycled rubber is less than 13 parts by weight, the recyclability is poor, and if the content of the desulfurized recycled rubber exceeds 33 parts by weight, there is a concern that the quality of the final product may deteriorate.

In the present invention, the non-vulcanized recycled rubber forming the foamed first rubber chip is used to increase the elasticity and shock absorption of the final product, and means non-vulcanized rubber discarded as a substandard product (B product) in the rubber production process and collected and recycled. In the practice of the present invention, the non-vulcanized recycled rubber may be non-vulcanized rubber that a rubber manufacturer such as Kumho Petrochemical separated and discarded as a substandard product because sufficient dehydration was not performed during the production process.

In the present invention, the non-vulcanized recycled rubber may be selected from at least one of EPDM, BR, SBR, NR, and LATEX. In practicing the present invention, the non-vulcanized rubber separated as an out-of-grade product may be collected and purchased from a recycling company for sale.

In practicing the present invention, the non-vulcanized recycled rubber may be used in an amount of 67 to 87 parts by weight, and preferably in an amount of 70 to 85 parts by weight. If the content of the non-vulcanized recycled rubber is less than 67 parts by weight, the original physical properties such as tensile strength and elongation may deteriorate, and the quality of the final product may deteriorate, such as not being able to meet shock-absorbing performance standards such as head damage of the user due to reduced elasticity. If the content of the non-vulcanized recycled rubber is greater than 88 parts by weight, the shock-absorbing performance may improve, but the specific gravity may be reduced, causing problems in construction workability, and the unit price may be higher than that formed in the market, which may reduce practicality.

In the present invention, the vulcanized micronized rubber forming the foamed first rubber chip may be a vulcanized rubber that was previously produced but had to be discarded as waste, but is recycled in an environmentally friendly manner by being put back into the process. In practicing the present invention, the vulcanized micronized rubber may be an off-standard product having a diameter of 0.1 to 1 mm generated when pulverizing vulcanized rubber, and may preferably be a micronized EPDM rubber.

In practicing the present invention, the vulcanized micronized rubber may be used in an amount of 21 to 42 parts by weight, and preferably in an amount of 25 to 40 parts by weight. If the content of the vulcanized micronized rubber is less than 21 parts by weight, recyclability may be reduced, and if the content of the vulcanized micronized rubber is greater than 42 parts by weight, quality degradation of the final product may occur.

In the present invention, the calcium carbonate forming the foamed first rubber chip is used to ensure that the final product has an appropriate specific gravity value suitable for a children's playground, and can be used in an amount of 190 to 250 parts by weight, and preferably in a range of 200 to 245 parts by weight. When the content of the calcium carbonate is less than 190 parts by weight, the rubber content ratio increases, thereby lowering the specific gravity of the final product, which may be a factor affecting the construction workability and a factor causing an increase in price, and when the content of the calcium carbonate is more than 250 parts by weight, it may affect the original performance, such as shock absorption, and cause a deterioration in the performance of the final flooring material.

In the present invention, the water is used for foaming and can be used in a range of 0.2 to 0.4 parts by weight. If the content of the water is less than 0.2 parts by weight, the foaming property may be reduced, and if the content of the water exceeds 0.4 parts by weight, the pores become larger than the microfoaming desired to be achieved, which may lower the quality of the product and cause problems in the production process.

In the present invention, the zinc oxide forming the foamed first rubber chip is used as an accelerator that accelerates the vulcanization speed and can increase the crosslinking number and crosslinking efficiency with a short sulfur crosslinking length, and can be used in the range of 1 to 2 parts by weight. When the content of the zinc oxide is less than 1 part by weight, the crosslinking density may decrease, resulting in a deterioration in reinforcing properties and heat resistance, and when the content of the zinc oxide exceeds 2 parts by weight, there is no problem with performance, but environmental problems due to toxicity may occur when used excessively.

In the present invention, the rubber softener forming the foamed first rubber chip is an additive added to a rubber compound to make the rubber flexible and provide plasticity to facilitate processing, and is sometimes used to reduce the hardness of vulcanized rubber, and paraffin, naphthene, aromatic oil, etc. may be used. In the present invention, the rubber softener may be used in an amount of 5 to 10 parts by weight, and when the content of the rubber softener is less than 5 parts by weight, the hardness of the vulcanized rubber may become too high, which may lower the rubber processability during the crushing process and lower the quality of the product, and when the content of the rubber softener exceeds 10 parts by weight, on the contrary, the hardness of the vulcanized rubber may become too low, which may cause problems with the properties of the final product such as low-temperature characteristics, anti-fouling properties, aging resistance, elasticity, and wear resistance.

In the present invention, the stearic acid forming the foamed first rubber chip is used to promote the vulcanization reaction in the process of vulcanizing rubber with sulfur, and is added together with the zinc oxide to reduce the process time, and after they react with each other, zinc stearate having high solubility is produced, and then a complex is formed with a vulcanization accelerator to rapidly induce the vulcanization speed. It can be used in the range of 1 to 2 parts by weight, and when the content of the stearic acid is less than 1 part by weight, the vulcanization reaction may be slowed down, which may lower the productivity, and when the content of the stearic acid exceeds 2 parts by weight, the vulcanization speed may be accelerated, which may cause a deterioration in product quality due to heat.

In the present invention, the wax forming the foamed first rubber chip is used to prevent and delay deformation, especially aging, due to ultraviolet rays and ozone, and can be used in the range of 1 to 2 parts by weight. If the content of the wax is less than 1 part by weight, the product may be vulnerable to ultraviolet rays and ozone, and the longer the final product is exposed to the outside, the more likely it is that it will age, corrode, and fade. If the content of the wax exceeds 2 parts by weight, problems may occur in the production process, such as excessive mixing and kneading.

In the present invention, the sulfur forming the foamed first rubber chip can be used as a crosslinking agent for thermal curing in the rubber composition, and can be used in a range of 1 to 2.5 parts by weight. When the content of the sulfur is less than 1 part by weight, the degree of crosslinking may be reduced, and when the content of the sulfur exceeds 2.5 parts by weight, elasticity may be reduced due to excessive crosslinking.

In the present invention, the vulcanization accelerator forming the foamed first rubber chip can be used to shorten the vulcanization time of rubber , lower the vulcanization temperature, reduce the amount of sulfur, and improve the quality of vulcanized rubber , and mainly uses an organic accelerator, and a Thiuram accelerator having a very fast vulcanization speed, a Sulfenamide accelerator having a relatively fast vulcanization speed, and a Guanidine accelerator having an intermediate speed can be used according to the production process situation with respect to the vulcanization speed.

In the present invention, the vulcanization accelerator may be used in a range of 0.4 to 2 parts by weight, and when the content of the vulcanization accelerator is less than 0.4 parts by weight, the reaction time during rubber vulcanization may be delayed and the amount of the vulcanization accelerator used may relatively increase, and when the content of the vulcanization accelerator exceeds 2 parts by weight, the vulcanization reaction time may be too fast and the vulcanized rubber may burn during heat curing.

In the present invention, the foamed first rubber chip may be a rubber chip manufactured by mixing a mixture, foaming the mixture, vulcanizing the mixture, and then crushing the mixture.

In practicing the present invention, the mixing may be mixing using a kneader, and preferably, a dough-like mixture can be prepared. The kneader can be purchased and used commercially.

에서 이루어지는 발포 시트의 압출일 수 있다. In the practice of the present invention, the foaming may be water foaming that is formed by evaporation of water contained in the composition, and preferably, it may be extrusion foaming that is formed together with extrusion in an extruder. In one practice of the present invention, the extrusion is 60 to 65

It can be an extrusion of a foam sheet made in .

In practicing the present invention, the vulcanization can be carried out by dividing the foam sheet, loading it on a tray, and then leaving it standing inside a tank, and preferably, it can be carried out at 125 to 130°C, for 100 to 130 minutes per cycle.

In practicing the present invention, shredding can be performed by a shredder.

In the present invention, the foamed first rubber chip may have a size of 1-10 mm, preferably a size of 2-9 mm, and more preferably a size of 3-8 mm in diameter, and the fraction of rubber chips may be 50-90 wt%.

In the present invention, the crushed aggregate forming the lower elastic mixture is used to provide stability by transferring the entire load of the shock-absorbing floor material using natural materials, and to provide dimensional stability through smooth mixing and laying processes with other materials as if they were a sedimentary layer in a crushed form, and can be used in the range of 30 to 80 wt% of the total 100 wt% of the lower elastic mixture, preferably 40 to 75 wt%, and more preferably 45 to 70 wt%.

In the present invention, if the content of the aggregate is less than the above range, the weight stability may be reduced, and after the construction of the shock-absorbing flooring is completed, the end surface may roll up, or the joint portion may become loose due to dimensional imbalance. If the content of the aggregate exceeds the above range, the original functionality may not be properly exhibited, such as reduced shock absorption.

In practicing the present invention, the aggregate may be a crushed or broken aggregate having a size of 1 to 10 mm, and may be purchased commercially and used.

In the present invention, the recycled foam chips forming the lower elastic layer mixture are collected and crushed foamed EVA and/or PE, and are used to crush synthetic rubber materials such as high-density and low-foam EVA that are wasted as waste resources (incineration treatment) or foam-type products manufactured from PE resin, and recycled as elastic bodies instead of waste tire rubber, so that they are not only environmentally friendly but also provide excellent shock absorption and shock dissipation to the lower elastic layer.

In practicing the present invention, the recycled foam chips can be used in a range of 5 to 20 wt% based on 100 parts by weight of the total lower elastic mixture, preferably 5 to 15 wt%, and more preferably 5 to 10 wt%.

In the present invention, if the content of the recycled foam chips is less than the above range, the environmental friendliness originally intended to be achieved may be lacking compared to shock-absorbing flooring materials using conventional waste tires, and the functionality such as the shock-absorbing performance of the product may be reduced. If the content of the recycled foam chips exceeds the above range, the elastic repulsive force may be increased compared to the shock-absorbing property, which may increase the occurrence rate of defects in the joint portion, and the stability of the flooring material may be reduced due to its light weight.

In the practice of the present invention, the recycled foam chip may have a hardness value of 10 to 40. If the hardness value of the recycled foam chip is less than the above range, the amount of urethane binder used during installation absorbed into the pores of the foam chip is relatively large, which increases unnecessary usage, and furthermore, when the binder in the pores hardens, the physical properties become hard, which may result in a decrease in shock absorption, and if the hardness value is greater than the above range, the compressive strength and compressive stress may be strengthened, but these also become hard, making it difficult to fully exhibit the functionality, such as shock absorption, that is intended to be achieved.

In the present invention, the binder forming the lower elastic layer is used to bind the lower elastic mixture composed of foamed first rubber chips, crushed aggregate, and recycled foam chips.

In practicing the present invention, the binder may be a polyurethane binder, and may be formed by mixing 8 to 18 parts by weight of the polyurethane binder with respect to 100 parts by weight of the lower elastic mixture.

In one embodiment of the present invention,

A foamed first rubber chip having a diameter of 1 to 10 mm, which is vulcanized by mixing and foaming 100 parts by weight of a non-vulcanized recycled rubber mixture comprising 13 to 33 parts by weight of desulfurized recycled rubber recycled by desulfurizing vulcanized rubber and 67 to 87 parts by weight of non-vulcanized recycled rubber, 21 to 42 parts by weight of vulcanized finely divided rubber, 190 to 250 parts by weight of calcium carbonate, 0.2 to 0.4 parts by weight of water, 1 to 2 parts by weight of zinc oxide, 5 to 10 parts by weight of a rubber softener, 1 to 2 parts by weight of stearic acid, 1 to 2 parts by weight of wax, 1 to 2.5 parts by weight of sulfur, and 0.4 to 2 parts by weight of a vulcanization accelerator,

Crushed aggregate with particle size of 1 to 10 mm,

A lower elastic layer made by mixing and spreading a binder into a lower elastic mixture of recycled foam chips made by recycling foamed EVA and/or PE: and

The present invention provides a shock-absorbing flooring material for a children's playground, which includes an upper elastic layer formed by mixing and paving a binder in second rubber chips having a diameter of 1 to 4 mm, the second rubber chips being vulcanized by mixing 100 parts by weight of non-vulcanized recycled rubber, 21 to 42 parts by weight of vulcanized finely divided rubber, 170 to 240 parts by weight of calcium carbonate, 1 to 2.3 parts by weight of zinc oxide, 5 to 10 parts by weight of a rubber softener, 1 to 2.3 parts by weight of stearic acid, 1 to 2.3 parts by weight of wax, 2 to 3 parts by weight of sulfur for vulcanization, 1 to 3 parts by weight of a vulcanization accelerator, 0.4 to 5 parts by weight of a pigment, and 1 to 3 parts by weight of an anti-aging agent.

In another embodiment of the present invention,

A foamed first rubber chip having a diameter of 1 to 10 mm, which is vulcanized by mixing and foaming 100 parts by weight of a non-vulcanized recycled rubber mixture comprising 13 to 33 parts by weight of desulfurized recycled rubber recycled by desulfurizing vulcanized rubber and 67 to 87 parts by weight of non-vulcanized recycled rubber, 21 to 42 parts by weight of vulcanized finely divided rubber, 190 to 250 parts by weight of calcium carbonate, 0.2 to 0.4 parts by weight of water, 1 to 2 parts by weight of zinc oxide, 5 to 10 parts by weight of a rubber softener, 1 to 2 parts by weight of stearic acid, 1 to 2 parts by weight of wax, 1 to 2.5 parts by weight of sulfur, and 0.4 to 2 parts by weight of a vulcanization accelerator,

Crushed aggregate with particle size of 1 to 10 mm,

A lower elastic layer made by mixing and spreading a binder into a lower elastic mixture of recycled foam chips made by recycling foamed EVA and/or PE: and

An artificial grass-type shock-absorbing flooring material is provided, which includes artificial grass installed on the upper surface of the lower elastic layer.

In another aspect, the present invention comprises:

A step of mixing 100 parts by weight of an unvulcanized rubber mixture comprising 13 to 33 parts by weight of desulfurized recycled rubber recycled by desulfurizing vulcanized rubber and 67 to 87 parts by weight of unvulcanized recycled rubber, 21 to 42 parts by weight of vulcanized finely divided rubber, 190 to 250 parts by weight of calcium carbonate, 0.2 to 0.4 parts by weight of water, 1 to 2 parts by weight of zinc oxide, 5 to 10 parts by weight of a rubber softener, 1 to 2 parts by weight of stearic acid, 1 to 2 parts by weight of wax, 1 to 2.5 parts by weight of sulfur, and 0.4 to 2 parts by weight of a vulcanization accelerator.

Foaming stage;

vulcanization treatment step; and

A method for manufacturing a foamed first rubber chip including a crushing step is provided.

The present invention provides an environmentally friendly and elastic shock-absorbing flooring material and a lower elastic layer for a children's playground, which do not fundamentally use materials containing organic solvents or generating volatile organic compounds, such as regenerated SBR rubber chips.

In addition, the present invention crushes synthetic rubber materials such as high-density and low-foam EVA, which are wasted as waste resources (incineration treatment), or foam products manufactured with PE resin, and recycles them into elastic bodies, and instead of the existing tire and industrial waste rubber, which are controversial due to their harmful properties (carcinogens-PaHs, etc.), it manufactures upper and lower elastic chips with directly recycled synthetic rubber, thereby resolving this problem, and by mixing in aggregate crushed material, which is a natural material, it increases dimensional stability with an appropriate weight load, thereby solving the problems of lifting after installation, end rolling, or joint separation.

In addition, from an economic perspective, it is constructed in a single layer without joints, unlike existing children's playground flooring materials, so it is easy to maintain, has better durability, and is environmentally friendly as a natural material, but it is highly dependent on overseas imports, which raises concerns about foreign currency waste and prolongs the construction period due to the overseas import of raw materials. It can replace cork elastic material.

In addition, instead of the conventional process of crushing waste tires or industrial rubber used as the elastic body for the lower elastic layer, the process of crushing scraps and recycled boards in the form of foam made of synthetic rubber or synthetic resin, such as high-density, low-foaming EVA, as eco-friendly recycled materials, is used to manufacture the elastic body, and in addition, by directly manufacturing rubber chips for the upper and lower parts with synthetic rubber resin, there is an effect of job creation.

In addition, in terms of performance, it can prevent user injuries and safety accidents through excellent shock absorption and dispersion, and through this, it can significantly reduce the head injury (HIC) rate of children in children's playgrounds. In addition, it can be produced in various colors, so it is in harmony with the urban landscape and has no sense of incongruity, and unlike elastic bodies derived from natural materials such as cork, it has excellent durability and increases resistance to damage. The basic properties of the ideal tensile strength and elongation of the structure are increased, and the bending toughness is increased, thereby increasing the product's expected lifespan through enhanced wear resistance and durability.

In addition, since existing roll sheet-type or rectangular rubber mat-type elastic packaging materials are ready-made products, joints are inevitably created during on-site construction, whereas the present invention is an integral construction adhesive method without joints during on-site construction, so it prevents lifting at the ends and is easy to construct on curved surfaces, so it is not limited to the shape and material of any base layer, and thus has excellent construction applicability.

FIG. 1 is a photograph illustrating a cross-section of a children's playground-type shock-absorbing flooring material according to one embodiment of the present invention.
FIG. 2 is a photograph illustrating a cross-section of an artificial grass-type shock-absorbing flooring material according to another embodiment of the present invention.
FIG. 3a is a photograph showing a cross-section of a foamed first rubber chip according to one embodiment of the present invention.
Figure 3b is a photograph showing a cross-section of a non-foamed first rubber chip according to a comparative example of the present invention.

Hereinafter, the present invention will be described in detail through examples. It should be noted that the following examples are not intended to limit the present invention, but are intended to illustrate it.

Example 1: Construction of shock-absorbing flooring for children's play facilities

a) Manufacturing of foam type first rubber chips

의 열을 가해 스크류형 챔버 내에서 분해하여 가황 고리를 끊어서 탈황 재활용 고무 30 중량부와, 함수율이 높아 등외품으로 분리된 비가황 고무를 수거하여 탈수 후 판매하는 재활용 업체로부터 구입한 BR 고무를 직육면체 또는 롤(Roll) 형태로 수급하여 재활용 비가황 고무 70 중량부를 혼합할 수 있도록 총 100 중량부를 준비하였다. First, apply EPDM weather strap at 250 to 300

A total of 100 parts by weight of BR rubber was prepared so that 30 parts by weight of desulfurized recycled rubber was mixed by applying heat to it, decomposing it in a screw chamber, breaking the vulcanization ring, and 70 parts by weight of recycled non-vulcanized rubber was mixed by purchasing it in the form of a rectangular solid or roll from a recycling company that collects non-vulcanized rubber separated as substandard products due to its high moisture content, dehydrates it, and sells it.

Next, 100 parts by weight of the prepared chip-shaped unvulcanized rubber mixture, 30 parts by weight of finely divided EPDM rubber having a diameter of 0.1 to 1 mm obtained by crushing and sieving vulcanized EPDM rubber sheets, 230 parts by weight of calcium carbonate, 0.3 parts by weight of water, 1.5 parts by weight of zinc oxide, 7 parts by weight of a rubber softener, 1.5 parts by weight of stearic acid, 1.5 parts by weight of wax, 2 parts by weight of sulfur, and 1 part by weight of a vulcanization accelerator were charged and stirred to prepare a mixture.

Next, the mixture produced in the kneader was extruded at a temperature of 60 to 65°C to produce a foam sheet.

Next, the manufactured foam sheets were cut into a predetermined size, loaded onto a tray, and then vulcanized to manufacture vulcanized foam sheets of the predetermined size.

Next, the vulcanized foam sheets were crushed to produce foamed first rubber chips having a diameter of 1 to 10 mm.

b) Construction of lower elastic layer

A polyurethane primer layer was applied to the base layer, and 40 parts by weight of the foamed first rubber chips manufactured above, 50 parts by weight of crushed aggregate having a particle size of 1 to 10 mm, 10 parts by weight of EVA crushed foam having a hardness value of 26, and 15 parts by weight of polyurethane binder were mixed and laid thereon.

The lower elastic layer meets the standards of SPS-KSSFIA1-1944:2017 for on-site installation shock-absorbing flooring for children's play facilities.

c) Manufacturing of second rubber chips

A total of 100 parts by weight of BR rubber purchased from a recycling company that collects, dehydrates, and sells non-vulcanized rubber separated as substandard products due to its high moisture content was placed into a kneader, and 30 parts by weight of finely divided EPDM rubber having a diameter of 0.1 to 1 mm, obtained by crushing vulcanized EPDM rubber sheets and screening them to remove genuine products, 200 parts by weight of calcium carbonate, 1.5 parts by weight of zinc oxide, 7 parts by weight of a rubber softener, 1.5 parts by weight of stearic acid, 1.5 parts by weight of wax, 2 parts by weight of sulfur, and 2 parts by weight of a vulcanization accelerator were placed and stirred to prepare a mixture.

Next, the mixture produced by mixing in a kneader was extruded into a sheet shape at a temperature of 60 to 65°C, the extruded sheet was cut into a predetermined size, loaded onto a tray, and vulcanized to produce vulcanized sheets of a predetermined size, and the produced vulcanized sheets were pulverized to produce second rubber chips with a diameter of 1 to 4 mm.

d) Construction of the upper elastic layer

As shown in Fig. 1, 100 parts by weight of second rubber chips and 20 parts by weight of polyurethane binder were mixed and laid on the previously constructed lower elastic layer to form an upper elastic layer, and the upper elastic layer was hardened to construct a shock-absorbing flooring material for a children's playground.

Example 3: Construction of artificial grass shock-absorbing flooring

a) Manufacturing of foam type first rubber chips

First, 30 parts by weight of desulfurized recycled rubber chips, which are made by decomposing a shoe sole made of natural rubber as a main material and vulcanizing it by heating it to 250 to 300℃ in a screw chamber to break the vulcanization ring and desulfurize it, and 70 parts by weight of EP recycled unvulcanized rubber purchased from a recycling company that collects, dehydrates, and sells unvulcanized rubber separated as substandard products due to its high moisture content, were mixed to prepare a total of 100 parts by weight of an unvulcanized rubber mixture.

Next, 100 parts by weight of the prepared non-vulcanized rubber mixture, 30 parts by weight of finely divided EPDM rubber having a diameter of 0.1 to 1 mm obtained by crushing a vulcanized EPDM rubber plate and then screening it to remove the genuine product, 220 parts by weight of calcium carbonate, 0.3 parts by weight of water, 1.5 parts by weight of zinc oxide, 7 parts by weight of a rubber softener, 1.5 parts by weight of stearic acid, 1.5 parts by weight of wax, 2 parts by weight of sulfur, and 1 part by weight of a vulcanization accelerator were charged and stirred to prepare a mixture.

Next, the mixture produced in the kneader was extruded at a temperature of 60 to 65°C to produce a foam sheet.

Next, the manufactured foam sheets were cut into a predetermined size, loaded onto a tray, and then vulcanized to manufacture vulcanized foam sheets of the predetermined size.

Next, the vulcanized foam sheets were crushed to produce foamed first rubber chips having a diameter of 1 to 10 mm.

b) Construction of lower elastic layer

A polyurethane primer layer was applied to the base layer, and 100 parts by weight of a lower elastic layer mixture was installed thereon, which was composed of 40 parts by weight of the manufactured foamed first rubber chips, 50 parts by weight of crushed aggregate having a particle size of 1 to 10 mm, and 10 parts by weight of EVA crushed foam having a hardness value of 26, mixed with 15 parts by weight of polyurethane binder. The constructed lower elastic layer satisfied the SPS-KSSFIA1-1944:2017 on-site shock-absorbing flooring materials for children's play facilities.

c) High density artificial grass

A high-density artificial grass mat with enhanced shock absorption and pile resilience was manufactured by using an outer yarn thickness of 8,500 to 9,500 Denier and an inner yarn thickness of 5,000 to 6,000 Denier, thereby forming a double structure by simultaneously knitting straight outer yarns and curly inner yarns within one stitch. The yarn length was 15 to 25 mm, and the weight was 1,200 to 1,650 g per ㎡.

d) Construction of artificial grass layer

As shown in Fig. 2, a high-density artificial grass mat manufactured in a roll shape was spread on a pre-constructed lower elastic layer, and 5 to 10 parts by weight of silica sand per 1 m2 was selectively laid inside the mat to construct an artificial grass floor. The high-density artificial grass is fixed on the lower elastic layer by its own weight and silica sand, and is fixed without using a separate elastic chip.

Claims (10)

A first vulcanized rubber chip having a diameter of 1 to 10 mm, which is vulcanized by mixing and foaming 100 parts by weight of an unvulcanized rubber mixture comprising 13 to 33 parts by weight of desulfurized recycled rubber recycled by desulfurizing vulcanized rubber and 67 to 87 parts by weight of unvulcanized recycled rubber, 21 to 42 parts by weight of vulcanized finely divided rubber, 190 to 250 parts by weight of calcium carbonate, 0.2 to 0.4 parts by weight of water, 1 to 2 parts by weight of zinc oxide, 5 to 10 parts by weight of a rubber softener, 1 to 2 parts by weight of stearic acid, 1 to 2 parts by weight of wax, 1 to 2.5 parts by weight of sulfur, and 0.4 to 2 parts by weight of a vulcanization accelerator, and:
Crushed aggregate with particle size of 1 to 10 mm;
Recycled foam chips made from recycled foamed EVA and/or PE synthetic rubber resin series; and
A lower elastic layer comprising a binder;
Here, the lower elastic layer is a shock-absorbing flooring material characterized in that it contains 1 to 20 parts by weight of a binder for 100 parts by weight of a lower elastic mixture composed of 20 to 50 parts by weight of foamed first vulcanized rubber chips, 30 to 75 parts by weight of crushed aggregate, and 5 to 20 parts by weight of recycled foam chips. delete delete In the first paragraph,
A shock-absorbing flooring material characterized in that the above-mentioned desulfurized recycled rubber is a rubber that is desulfurized by applying heat to vulcanized EPDM rubber and/or vulcanized BR rubber. In the first paragraph,
A shock-absorbing flooring material characterized in that the above non-vulcanized recycled rubber is selected from at least one synthetic rubber resin such as EPDM, BR, SBR, NR, LATEX, etc. In the first paragraph,
A shock-absorbing flooring material characterized in that the above-mentioned vulcanized micronized rubber is a micronized EPDM rubber having a diameter of 0.1 to 1 mm generated when the vulcanized rubber is crushed. In the first paragraph,
A shock-absorbing flooring material characterized in that the above recycled foam chips have a hardness value of 10 to 40. A foamed first vulcanized rubber chip having a diameter of 1 to 10 mm, which is vulcanized by mixing and foaming 13 to 33 parts by weight of desulfurized recycled rubber recycled by desulfurizing vulcanized rubber, 67 to 87 parts by weight of non-vulcanized recycled rubber, 21 to 42 parts by weight of vulcanized fine-powder rubber, 190 to 250 parts by weight of calcium carbonate, 0.2 to 0.4 parts by weight of water, 1 to 2 parts by weight of zinc oxide, 5 to 10 parts by weight of a rubber softener, 1 to 2 parts by weight of stearic acid, 1 to 2 parts by weight of wax, 1 to 2.5 parts by weight of sulfur, and 0.4 to 2 parts by weight of a vulcanization accelerator,
Crushed aggregate with particle size of 1 to 10 mm,
Recycled foam chips made from recycled foamed EVA and/or PE synthetic rubber resin, and
The lower elastic layer is mixed and laid with a binder;
Here, the lower elastic layer comprises 1 to 20 parts by weight of a binder for 100 parts by weight of a lower elastic mixture comprising 20 to 50 parts by weight of foamed first vulcanized rubber chips, 30 to 75 parts by weight of crushed aggregate, and 5 to 20 parts by weight of recycled foam chips; and
A shock-absorbing flooring material for a children's playground, comprising: an upper elastic layer formed by mixing and paving second vulcanized rubber chips having a diameter of 1 to 4 mm, the second vulcanized rubber chips comprising 100 parts by weight of non-vulcanized recycled rubber, 21 to 42 parts by weight of vulcanized finely divided rubber, 170 to 240 parts by weight of calcium carbonate, 1 to 2.3 parts by weight of zinc oxide, 5 to 10 parts by weight of a rubber softener, 1 to 2.3 parts by weight of stearic acid, 1 to 2.3 parts by weight of wax, 2 to 3 parts by weight of sulfur for vulcanization, 1 to 3 parts by weight of a vulcanization accelerator, 0.4 to 5 parts by weight of a pigment, and 1 to 3 parts by weight of an anti-aging agent; A foamed first vulcanized rubber chip having a diameter of 1 to 10 mm, which is vulcanized by mixing and foaming 13 to 33 parts by weight of desulfurized recycled rubber recycled by desulfurizing vulcanized rubber, 67 to 87 parts by weight of non-vulcanized recycled rubber, 21 to 42 parts by weight of vulcanized fine-powder rubber, 190 to 250 parts by weight of calcium carbonate, 0.2 to 0.4 parts by weight of water, 1 to 2 parts by weight of zinc oxide, 5 to 10 parts by weight of a rubber softener, 1 to 2 parts by weight of stearic acid, 1 to 2 parts by weight of wax, 1 to 2.5 parts by weight of sulfur, and 0.4 to 2 parts by weight of a vulcanization accelerator,
Crushed aggregate with particle size of 1 to 10 mm,
Recycled foam chips made from recycled foamed EVA and/or PE synthetic rubber resin, and
A lower elastic layer mixed and spread with a binder, wherein the lower elastic layer comprises 1 to 20 parts by weight of a binder for 100 parts by weight of a lower elastic mixture composed of 20 to 50 wt% of foamed first vulcanized rubber chips, 30 to 75 wt% of crushed aggregate, and 5 to 20 wt% of recycled foam chips; and
A shock-absorbing flooring material comprising: artificial grass installed on the upper surface of the lower elastic layer. In Article 9,
An artificial grass mat having improved shock absorption and pile resilience is manufactured by using an outer yarn thickness of 8,500 to 9,500 Denier and an inner yarn thickness of 5,000 to 6,000 Denier to form a double structure by simultaneously knitting the outer yarn in a straight shape and the inner yarn in a curly shape within one stitch, wherein the length of the yarn is 15 to 25 mm and the weight is 1,200 to 1,650 g per ㎡, and a shock-absorbing flooring material characterized in that a high-density artificial grass mat manufactured in a roll shape is installed on top of a previously constructed lower elastic layer, and 5 to 10 parts by weight of silica per 1 ㎡ is laid inside the mat to construct an artificial grass floor surface, and so that it is settled on the lower elastic layer by its own weight and the silica.