KR101113245B1 - Elastic floor material with non-slip function - Google Patents

Abstract

PURPOSE: An elastic floor material having a slip prevention function is provided to satisfy shape stability, abrasion resistance, light resistance, shock absorption, vertical deformation, and mechanical properties at the same time. CONSTITUTION: An elastic floor material having a slip prevention function is made from a composite sheet composed of upper and lower sheets. The upper sheet is formed into an upper extruded foam sheet by extruding and foaming an upper extrusion composition. A plurality of projections or recesses are formed on the top surface of the upper sheet. The lower sheet is formed into a lower extruded foam sheet having a plurality of grid grooves on the bottom surface thereof by extruding and foaming a lower extrusion composition. The lower sheet is attached to the upper sheet.

Description

Elastic floor material with non-slip function

The present invention relates to an elastic flooring material and a method of manufacturing the same, and more particularly, to an elastic flooring material that can be installed on the floor of an athletic facility such as a playground, a playground, a park, and the like, to provide a function such as shock absorption and anti-slip and a rotocure It relates to a method of manufacturing using a conventional extruder instead of a continuous vulcanization device such as (Rotocure).

The elastic flooring material has high impact absorption to minimize the impact to prevent safety accidents, comfortable walking and fatigue, and special materials to prevent slippage, soundproofing effect, and low thermal conductivity, so winter snow melts quickly and is made of rubber. Easy to construct, convenient, and produce beautiful appearance with various colors and designs, excellent durability by minimizing the shape change, excellent weather resistance (light resistance), long-term use, easy maintenance, and summer It is to minimize the generation of radiant heat. Such elastic flooring is used in golf, golf practice, fitness, dance, gym, swimming pool, aerobics, leisure sports, racecourse, basketball court, foot ball court, inline skating rink, and also used in veranda, office, exhibition hall, factory, school uniform It is also used for pedestrians, overpasses, public facilities, rest areas, and highway rest areas, and is also used for parks, jogging courses, bicycle paths, trails, overpasses, walkways, and platforms (buses, taxis), especially for infants, children, the elderly, It is also used in safety facilities, apartments, school grounds, apartments, children's playgrounds, and child care centers where people with disabilities are frequent.

Meanwhile, the elastic flooring material is mainly vulcanized in a state in which a mixture of polyurethane, epoxy, recycled urethane, ethylene propylene diene monomer rubber (EPDM rubber), PVC, pettier, and pego rubber is stirred at a constant ratio with a curing agent and a curing accelerator. To form a sheet. In this case, a continuous vulcanization apparatus such as Rotocure is used to produce a large amount of elastic flooring, and thus, the manufacturing process is complicated and there is a problem such as an increase in manufacturing cost due to introduction of special equipment.

In addition, the elastic flooring material may be manufactured by a conventional extruder instead of a continuous vulcanizing device, wherein the raw material for extrusion includes ethylene propylene diene monomer rubber (EPDM rubber), polyolefin, foaming agent, process oil and the like. However, the elastic flooring material which is formed into a sheet form by extruding and foaming the raw material for extrusion is generally required characteristics of shape stability, wear resistance, light resistance, impact absorption rate, vertical strain, mechanical properties (for example, tensile strength, elongation rate, etc.). ) There is a limit to satisfying at the same time.

The present invention has been drawn to solve the conventional problems, one object of the present invention can be produced by a conventional extruder instead of a continuous vulcanization device, morphological stability, which is a characteristic commonly required for elastic flooring, such as school grounds, An object of the present invention is to provide an elastic flooring material capable of satisfying wear resistance, light resistance, impact absorption rate, vertical strain, and mechanical properties (eg, tensile strength, elongation, etc.) at the same time. Particularly, one object of the present invention is to provide an elastic flooring material having an anti-slip function so as to prevent safety accidents of infants, children, the elderly, and the disabled as well as shock absorbing function.

In addition, another object of the present invention is to form stability, wear resistance, light resistance, impact absorption rate, vertical strain, mechanical properties (e.g. tensile strength, elongation, etc.) by a simple extruder instead of a continuous vulcanizing apparatus in a simple process and low manufacturing cost The present invention provides an excellent method for producing an elastic flooring material.

In order to solve the object of the present invention, the present invention is composed of a composite sheet comprising a top sheet and a bottom sheet bonded to the top sheet and integrated, the top sheet 100 parts by weight of thermoplastic elastomer (TPE) Upper part containing 10 to 100 parts by weight of unvulcanized ethylene propylene diene monomer rubber, 20 to 100 parts by weight of polyolefin, 50 to 200 parts by weight of mineral oil, 100 to 400 parts by weight of calcium carbonate and 2 to 10 parts by weight of blowing agent Extruded foam sheet of the composition for extrusion, the lower sheet is 80 to 200 parts by weight of vulcanized rubber powder per 100 parts by weight of thermoplastic elastomer (TPE), 10 to 60 parts by weight of vulcanized EPDM rubber (ethylene propylene diene Monomer rubber) Extruded foam sheet of the composition for bottom extrusion comprising 10 to 100 parts by weight of polyolefin, 50 to 200 parts by weight of mineral oil, 100 to 400 parts by weight of calcium carbonate and 5 to 20 parts by weight of blowing agent. In addition, the thermoplastic elastomer (TPE) included in the top extrusion composition and the bottom extrusion composition is characterized in that the SBS block copolymer (styrene-butadiene-styrene block copolymer) or olefin block copolymer (olefin block copolymer) To provide an elastic flooring. In this case, it is preferable that a plurality of protrusions or bends are formed on the upper surface of the upper sheet, and a plurality of grooves are formed on the lower surface of the lower sheet and are repeated in a lattice form.

In order to solve the other object of the present invention, the present invention comprises the steps of preparing an extruder having an upper plate nozzle and a lower plate nozzle adjacent to each other; 10 to 100 parts by weight of ethylene propylene diene monomer rubber, 20 to 100 parts by weight of polyolefin, 50 to 200 parts by weight of mineral oil, 100 to 400 parts by weight of calcium carbonate per 100 parts by weight of thermoplastic elastomer (TPE) Preparing a composition for the top extrusion by kneading the parts and 2 to 10 parts by weight of the blowing agent; 80 to 200 parts by weight of vulcanized rubber powder per 100 parts by weight of thermoplastic elastomer (TPE), 10 to 60 parts by weight of unvulcanized ethylene propylene diene monomer rubber, 10 to 100 parts by weight of polyolefin, 50 to 200 mineral oil Preparing a composition for lower extrusion by kneading by weight, 100 to 400 parts by weight of calcium carbonate and 5 to 20 parts by weight of a blowing agent; The upper extrusion composition is extruded and foamed at a temperature of 150 to 250 ° C. through an upper plate nozzle to form an upper extrusion foam sheet, and the lower extrusion composition is extruded at a temperature of 150 to 250 ° C. through a lower plate nozzle. And foaming to form a lower extrusion foam sheet; Stacking the upper extruded foam sheet on the lower extruded foam sheet and passing between the upper press roller and the lower press roller to roll and bond the upper extruded foam sheet and the lower extruded foam sheet to obtain a composite sheet; And annealing the composite sheet at a temperature of 50 ° C. to 120 ° C., wherein the thermoplastic elastomer (TPE) included in the top extrusion composition and the bottom extrusion composition is an SBS block copolymer (styrene-butadiene). It provides a method for producing an elastic flooring material, characterized in that -styrene block copolymer or olefin block copolymer (olefin block copolymer). At this time, the upper roller surface is preferably formed with an embossed pattern consisting of a plurality of projections or bends. In addition, the lower roller surface is preferably formed with a plurality of projection patterns that are repeated in the form of a grid.

Elastic flooring according to the present invention is excellent in morphological stability, abrasion resistance, light resistance, impact absorption rate, vertical strain, mechanical properties (for example, tensile strength, elongation, etc.), which are usually required characteristics such as playgrounds, playgrounds, parks, etc. It can be applied to the same sports facilities, and in particular, the elastic flooring with an anti-slip function as well as the shock absorbing function can prevent safety accidents of infants, children, the elderly and the disabled.

In addition, when using the manufacturing method according to the invention it is possible to produce an elastic flooring material of the same or similar physical properties as the elastic flooring material prepared by a continuous vulcanization device such as Rotocure (Rotocure), without the vulcanization process, such as Rotocure Instead of the same continuous vulcanization apparatus, a conventional extruder can be used to provide a composite sheet-like elastic flooring, and the productivity is improved and manufacturing cost is reduced due to the simplification of the process and the absence of special equipment.

1 is a photograph showing the upper surface of the elastic flooring according to a preferred embodiment of the present invention, Figure 2 is a photograph showing the lower surface of the elastic flooring according to a preferred embodiment of the present invention.
3 is an electron micrograph showing the surface structure of vulcanized EPDM rubber (ethylene propylene diene monomer rubber) powder used in the preparation of the elastic flooring according to an embodiment of the present invention.
Figure 4 schematically shows the manufacturing process of the elastic flooring according to a preferred embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. If it is determined that the gist of the present invention may be obscured, the detailed description thereof will be omitted. In addition, the technical idea of the present invention may be implemented by those skilled in the art without being limited or limited to the following preferred example.

Before describing a preferred embodiment of the present invention will be described the terms used in the present invention. "Vulcanization" is a concept that includes not only an operation of applying sulfur to raw rubber to heat to change elasticity, but also an operation of changing plastic, that is, plastic material to elastic material. "Nozzle" is also the exit or opening through which the extrudate is ejected in the extruder, also called "die", and plate nozzles are commonly used in the art as plate dies or T-dies.

One aspect of the present invention relates to elastic flooring, in particular elastic flooring having an anti-slip function. 1 is a photograph showing the upper surface of the elastic flooring according to a preferred embodiment of the present invention, Figure 2 is a photograph showing the lower surface of the elastic flooring according to a preferred embodiment of the present invention. As shown in FIG. 1 and FIG. 2, the elastic flooring material according to the present invention is composed of a composite sheet including an upper sheet and a lower sheet bonded to and integrated with the upper sheet.

The upper sheet constituting the elastic flooring according to the present invention is a part exposed to the outside when the elastic flooring is constructed in a sports facility, mainly composed of an olefin-based material having a strong weather resistance and heat resistance to withstand weather and friction with the user for a long time. . Specifically, the top sheet may include 10 to 100 parts by weight of vulcanized EPDM rubber (ethylene propylene diene monomer rubber) per 100 parts by weight of thermoplastic elastomer (TPE), 20 to 100 parts by weight of polyolefin, 50 to 200 parts by weight of mineral oil, It is an extrusion foam sheet of the composition for top extrusion containing 100-400 weight part of calcium carbonates, and 2-10 weight part of foaming agents. In addition, the lower sheet constituting the elastic flooring according to the present invention has a composition similar to that of the upper sheet because it must support the upper sheet while providing continuous elasticity and form stability and at the same time have a firm adhesiveness with the upper sheet. Specifically, the lower sheet is 80 to 200 parts by weight of vulcanized rubber powder per 100 parts by weight of thermoplastic elastomer (TPE), 10 to 60 parts by weight of unvulcanized ethylene propylene diene monomer rubber, and 10 to 100 parts by weight of polyolefin. , Extruded foam sheet of the composition for lower extrusion comprising 50 to 200 parts by weight of mineral oil, 100 to 400 parts by weight of calcium carbonate and 5 to 20 parts by weight of blowing agent.

Thermoplastic elastomers (TPEs) included in the top extrusion composition and the bottom extrusion composition of the present invention are physically crosslinked elastomers without vulcanization and are also referred to as thermoplastic rubbers. Thermoplastic elastomers (TPEs) are block copolymers composed mainly of soft segments of rubber components and hard segments of resin components, and behave in the same manner as vulcanized rubber at room temperature, but when heated, the resin components soften and exhibit plasticity. The thermoplastic elastomer provides moldability when molding the composition for the top extrusion and the composition for the bottom extrusion into a sheet form, provides strong adhesion when the top sheet is bonded to the bottom sheet, and imparts shock absorbing properties to the final elastic flooring. . The thermoplastic elastomers used in the present invention are SBS block copolymers (styrene-butadiene-styrene block copolymers), olefin block copolymers (olefins) in view of commercial availability, sheet formability, adhesive properties, and impact absorption characteristics. It is composed of one or more selected from a block copolymer, or a polyolefin elastomer, and the thermoplastic elastomer used in the composition for double top extrusion is a styrene-butadiene-styrene block copolymer or an olefin block air. It is preferable that the copolymer is an olefin block copolymer, and the thermoplastic elastomer used in the composition for lower extrusion is preferably an SBS block copolymer (styrene-butadiene-styrene block copolymer). The olefin block copolymer is preferably a block copolymer of ethene and α-olefin, more preferably an ethene-octene block copolymer (specifically, a block copolymer of ethene and 1-octene), and Dow as a commercial product. INFUSE ™ from The Dow Chemical Company, US. In addition, the polyolefin elastomer is a homogeneously branched copolymer of ethene and α-olefin, examples of the α-olefin include 1-butene, 1-hexene, 4-methyl-1-heptene, 1-octene, 1-nonene, 1 Decene and the like, and commercial products include ENGAGE ™ from The Dow Chemical Company, US.

In addition, the unvulcanized EPDM rubber (ethylene propylene diene monomer rubber) included in the composition for top extrusion and the composition for bottom extrusion mainly gives elasticity to elastic flooring as an elastomer, and generally, DCPD (dicyclopentadiene) to ethylene and propylene. It is a terpolymer (three-component high molecular material) containing a lot of double bonds ternary hybridized by adding a third component, such as ENB (ethylidene norbornene), VNB (vinyl norbornene). Unvulcanized EPDM rubber is chemically stable, and the vulcanized material exhibits an intermediate property between natural rubber and SBR. The content of the unvulcanized EPDM rubber in the composition for upper extrusion of the present invention is 10 to 100 parts by weight, preferably 30 to 70 parts by weight, based on 100 parts by weight of a thermoplastic elastomer (TPE). In addition, the content of the unvulcanized EPDM rubber in the lower extrusion composition of the present invention is 10 to 60 parts by weight, preferably 20 to 60 parts by weight based on 100 parts by weight of a thermoplastic elastomer (TPE).

In addition, the polyolefin included in the composition for upper extrusion and the composition for lower extrusion of the present invention imparts mainly weather resistance and heat resistance to the elastic flooring material, and imparts moldability when molding the composition for upper extrusion and the composition for lower extrusion in the form of a sheet. As a component, if it is a conventionally used or known thing, the kind is not restrict | limited greatly, In consideration of the commercial availability and the formability to a sheet form, it is preferable that it is comprised from 1 or more types selected from polyethylene or polypropylene, and it is high density. More preferably polyethylene. The content of the polyolefin in the top extrusion composition of the present invention is 20 to 100 parts by weight, preferably 50 to 90 parts by weight, based on 100 parts by weight of a thermoplastic elastomer (TPE). In addition, the content of the polyolefin in the composition for lower extrusion is 10 to 100 parts by weight, preferably 30 to 70 parts by weight, based on 100 parts by weight of a thermoplastic elastomer (TPE).

In addition, the vulcanized rubber powder included in the lower extrusion composition of the present invention is a component that gives high elasticity and excellent morphological stability to the elastic flooring material, and considering the physical properties of the elastic flooring material and mixing with other components, the vulcanized EPDM rubber (ethylene propylene It is preferable to use diene monomer rubber powder, and in view of economics and environmental aspects such as resource recycling, the vulcanized ethylene propylene diene monomer rubber powder is more preferably a vulcanized ethylene propylene diene monomer rubber powder. In consideration of the kneading property, the moldability to the sheet, the vulcanized EPDM rubber (ethylene propylene diene monomer rubber) powder has a particle size of 500 μm or less (eg, 10 to 500 μm). In addition, in consideration of all the above properties, the surface of the vulcanized EPDM rubber (ethylene propylene diene monomer rubber) powder preferably has a microporous pore structure. The vulcanized ethylene propylene diene monomer rubber powder having a particle size of 500 µm or less and having a microporous pore structure on the surface is finely pulverized waste vulcanized ethylene propylene diene monomer rubber scrap by high temperature shear grinding method. , The method is described in detail in the Republic of Korea Patent No. 10-0530609 owned by Poly One Co., Ltd. of the present invention. The high temperature fine powdering apparatus of the vulcanized rubber material is characterized in that a reverse helical shear grinder and a pressure grinder are formed in a hot shear grinder for imparting chemical reactivity to the surface of rubber particles at the same time as hot shear milling. Here, the pressure crushing part is a space formed by the second screw and the second cylinder. Looking specifically at the grinding mechanism of the high-temperature fine pulverizing device of the vulcanized rubber material, the material introduced through the material inlet is compressed by the helical and the second cylinder of the first screw, the temperature is increased, the forward introduction of the reverse helical shear grinding unit As it passes, pressure and temperature are accelerated to reach extreme high pressure and extreme high temperatures. The mechanical pressure and thermal energy due to the shear force are accumulated as the internal energy of the injected material, and the pressure and the temperature are further increased as they are introduced into the introduction portion of the reverse helical shear mill. The internal energy, which has been maximized gradually, passes through the reverse end of the shear mill, and the internal energy exceeds the critical point, and the material instantly explodes and pulverizes with divergence. That is, the fine pulverized particles are obtained due to the instantaneous explosion caused by energy dissipation beyond the pulverization by a simple shear force. At this time, the waste materials used as raw materials are waste vulcanized rubber materials which are irreversibly vulcanized and cannot be recycled unlike thermoplastic plastic materials, for example, waste vulcanized EPDM rubber (ethylene propylene diene monomer rubber) scraps. For example, the method of obtaining waste vulcanized rubber fine powder by specific high temperature shear grinding method will be described in detail. First, the waste vulcanized rubber material generated during the molding process such as pressing, extrusion or injection is recovered and pulverized by a conventional low speed pulverizer and the like and initially pulverized to a particle size of about 10 to 30 mm. The pulverized waste vulcanized rubber material is introduced into the material inlet and transported by the first cylinder, wherein shear friction is generated by the projections formed on the helical teeth of the second screw and the lattice corrugated grooves formed on the inner surface of the first cylinder. The fine grinding is carried out sequentially, and at the same time, the compression is weighted and conveyed toward the second cylinder. The helical tooth pitch, which is reduced at the rear end of the first screw, is packed and compressed with the waste vulcanized rubber material. The conveyed waste vulcanized rubber material stays in reverse direction in the reverse helical shear mill of the second screw and is compacted to a greater extent. The internal temperature rises during compression of the waste vulcanized rubber material, but due to the characteristics of the waste vulcanized rubber material, the accumulated heat energy melts unlike the thermoplastic material and does not react in the direction of increasing entropy mechanically and mechanical shear force. The internal energy, which is converted into heat and pressure at and accumulates inside the material, reaches a critical point at a certain level. The internal energy accumulated in the waste vulcanized rubber material reaches the critical point and is continuously discharged at the end of the reverse helical shear mill by the energy that is excessively accumulated. Secondary grinding occurs as the waste vulcanized rubber material is dispersed. The waste vulcanized rubber material which has passed through the reverse helical shear grinding part is preserved under a certain time while passing through the pressure crushing section between the second screw and the second cylinder, that is, the pressure crushing part, and is pulverized into finer particles. . The waste vulcanized rubber material that has passed through the pressure crushing unit is finally discharged through the outlet while passing through the second screw. 3 is an electron micrograph showing the surface structure of vulcanized EPDM rubber (ethylene propylene diene monomer rubber) powder used in the preparation of the elastic flooring according to an embodiment of the present invention. The vulcanized EPDM rubber (ethylene propylene diene monomer rubber) powder shown in FIG. 3 is finely powdered waste vulcanized EPDM rubber scrap by the above-described high temperature shear grinding method, and as shown in FIG. Is formed and chemically activated. The content of the vulcanized rubber powder in the composition for lower extrusion is 80 to 200 parts by weight, preferably 80 to 150 parts by weight, based on 100 parts by weight of a thermoplastic elastomer (TPE).

In addition, the mineral oil contained in the composition for the top extrusion and the composition for the bottom extrusion of the present invention is softener or processing oil for imparting flexibility to synthetic rubber to increase plasticity to facilitate molding and processing operations. It is an oil obtained from mineral raw materials such as petroleum, coal, tar, and shell oil. In the present invention, the mineral oil is not particularly limited as long as it is commonly used or known, and is preferably a liquid paraffin in consideration of compatibility with other components, ease of handling, and the like. Liquid paraffin refers to tasteless, odorless, colorless transparent oily oils or white oils which are highly refined from a relatively low viscosity dewaxed oil. The content of the mineral oil in the composition for upper extrusion of the present invention is 50 to 200 parts by weight, preferably 100 to 200 parts by weight, based on 100 parts by weight of a thermoplastic elastomer (TPE). In addition, the content of the mineral oil in the composition for lower extrusion is 50 to 200 parts by weight, preferably 70 to 150 parts by weight based on 100 parts by weight of a thermoplastic elastomer (TPE).

In addition, the calcium carbonate contained in the composition for the top extrusion and the composition for the bottom extrusion of the present invention acts as a reinforcing agent to increase the strength of the elastic flooring material, the particle size in consideration of compatibility with other components, processability, moldability, etc. It is preferable that it is 10 micrometers or less. In view of economics, the calcium carbonate used in the present invention is preferably a commercial product provided in the form of refined marble, limestone, calcite, and shells. The content of calcium carbonate in the composition for top extrusion of the present invention is 100 to 400 parts by weight, preferably 200 to 350 parts by weight, based on 100 parts by weight of a thermoplastic elastomer (TPE). In addition, the content of calcium carbonate in the composition for lower extrusion is 100 to 400 parts by weight, preferably 150 to 300 parts by weight, based on 100 parts by weight of a thermoplastic elastomer (TPE).

In addition, the foaming agent included in the composition for the top extrusion and the composition for the bottom extrusion of the present invention is foamed when the composition for the top extrusion and the composition for the bottom extrusion is extruded in the form of a sheet to form a sheet in the form of foam (foam) and thereby to the sheet As a component that imparts elasticity and heat resistance, the type is not particularly limited as long as it is commonly used or known, and azodicarbonamide or hydrogen carbonate is considered in consideration of compatibility with other components, commercial availability, and foamability. It is preferably composed of one or more selected from sodium bicarbonate, more preferably azodicarbonamide. The content of the blowing agent in the composition for top extrusion of the present invention is 2 to 10 parts by weight, preferably 5 to 10 parts by weight based on 100 parts by weight of a thermoplastic elastomer (TPE). In addition, the content of the blowing agent in the lower extrusion composition of the present invention is 5 to 20 parts by weight, preferably 10 to 15 parts by weight based on 100 parts by weight of a thermoplastic elastomer (TPE).

In addition, the composition for the top extrusion in the elastic flooring according to the present invention is 5 to 30 parts by weight of pigment, 100 to 0.1 parts by weight of UV stabilizer, or 0.1 to 3 parts by weight of antioxidant per 100 parts by weight of thermoplastic elastomer (TPE) It may include, preferably 5 to 15 parts by weight of pigment, 0.5 to 2 parts by weight of UV stabilizer, 0.5 to 2 parts by weight of antioxidant per 100 parts by weight of thermoplastic elastomer (TPE). In addition, the composition for lower extrusion in the elastic flooring according to the present invention may further include 0.1 to 3 parts by weight of antioxidant per 100 parts by weight of thermoplastic elastomer (TPE), preferably thermoplastic elastomer (TPE) It may further comprise 0.5 to 2 parts by weight of antioxidant per 100 parts by weight. The pigment is a component that imparts a beautiful appearance to the top sheet constituting the elastic flooring material. The pigment is not particularly limited as long as it is commonly used or known, and examples thereof include a blue pigment and a red pigment. In addition, UV stabilizers and antioxidants are components that prevent the elastic flooring from ageing or oxidizing by ultraviolet rays, oxygen, etc. when the elastic flooring is constructed and exposed to sunlight, air, moisture, etc. for a long time. Kind is not greatly limited. The UV stabilizer has a function of blocking or absorbing UV rays, and is preferably a HALS-based material in consideration of its performance as an UV stabilizer and compatibility with other components. Hals (Hindered Amine Light Stabilizer, HALS) refers to a material in which an amine group is surrounded by a three-dimensional structure and is used as a light stabilizer. Commercial products of UV stabilizers include Tinuvin® (BASF). In addition, specific examples of the antioxidant include 2,2 ', 2 ", 6,6', 6" -hexa- (1,1-dimethylethyl) -4,4 ', 4 "-[(2,4,6 -Trimethyl-1,3,5-benzenetriyl) -trismethylene] -triphenol, 1,3,5, tris [3,5-di (1,1-dimethylethyl) -4-hydroxybenzyl]- 1H, 3H, 5H-1,3,5-triazine-2,4,6-trione, pentaerythritol tetrakis [3- [3,5-di (1,1-dimethylethyl) -4- Hydroxyphenyl] -propionate], octadecyl-3- [3,5-di (1,1-dimethylethyl) -4-hydroxyphenyl] -propionate, tris [2,4-di (1 , 1-dimethylethyl) -phenyl] -phosphite, 2,2'-di (octa-decyloxy) -5,5'-spirobi (1,3,2-dioxaphosphorinane), diocta Decyl disulfide, dididodecyl-3,3'-thiodipropionate, dioctadecyl-3,3'-thiodipropionate, butylhydroxytoluene, ethylene bis [3,3-di [3- (1 , 1-dimethylethyl) -4-hydroxyphenyl] butyrate], octadecyl-3,5-di-tert-butyl-hydroxyhydrocinnamate (octadecyl-3 , 5-di-tert-butyl-4-hydroxyhydrocinnamate), Tris (2,4-di-tert-buthylphenyl) phosphite], commercial products Examples include IRGANOX® (BASF) and IRGAFOS® (BASF).

In addition, the elastic flooring according to the present invention is preferably formed with a plurality of protrusions or bends on the upper surface of the upper sheet to prevent slipping as shown in FIG. In addition, the elastic flooring according to the present invention is a plurality of grooves that are repeated in the form of a lattice on the lower surface of the lower sheet when considering the improvement of heat resistance, the dispersion of stress applied to the elastic flooring, and the reduction in manufacturing cost, as shown in FIG. It is preferable that this be formed.

Another aspect of the invention relates to a method for producing an elastic flooring material, in particular a method for producing an elastic flooring material having an anti-slip function. Figure 4 schematically shows the manufacturing process of the elastic flooring according to a preferred embodiment of the present invention. As shown in FIG. 4, the method of manufacturing an elastic flooring material according to the present invention is performed by extruding and foaming a composition for upper extrusion and a composition for lower extrusion in an extruder having an upper plate nozzle and a lower plate nozzle adjacent to each other. Molding into an extruded foam sheet; Stacking the upper extruded foam sheet on the lower extruded foam sheet and passing it between two pressure rollers to roll and bond the upper extruded foam sheet and the lower extruded foam sheet to obtain a composite sheet; And annealing the composite sheet. Hereinafter, in the manufacturing method of the elastic flooring to be described later, the matters related to the composition for the top extrusion and the composition for the bottom extrusion are the same as those described above, and thus description thereof is omitted.

According to one or more exemplary embodiments, a method of manufacturing an elastic flooring may include preparing an extruder having an upper plate nozzle and a lower plate nozzle adjacent to each other; 10 to 100 parts by weight of ethylene propylene diene monomer rubber, 20 to 100 parts by weight of polyolefin, 50 to 200 parts by weight of mineral oil, 100 to 400 parts by weight of calcium carbonate per 100 parts by weight of thermoplastic elastomer (TPE) Preparing a composition for the top extrusion by kneading the parts and 2 to 10 parts by weight of the blowing agent; 80 to 200 parts by weight of vulcanized rubber powder per 100 parts by weight of thermoplastic elastomer (TPE), 10 to 60 parts by weight of unvulcanized ethylene propylene diene monomer rubber, 10 to 100 parts by weight of polyolefin, 50 to 200 mineral oil Preparing a composition for lower extrusion by kneading by weight, 100 to 400 parts by weight of calcium carbonate and 5 to 20 parts by weight of a blowing agent; The upper extrusion composition is extruded and foamed at a temperature of 150 to 250 ° C. through an upper plate nozzle to form an upper extrusion foam sheet, and the lower extrusion composition is extruded at a temperature of 150 to 250 ° C. through a lower plate nozzle. And foaming to form a lower extrusion foam sheet; Stacking the upper extruded foam sheet on the lower extruded foam sheet and passing between the upper press roller and the lower press roller to roll and bond the upper extruded foam sheet and the lower extruded foam sheet to obtain a composite sheet; And annealing the composite sheet at a temperature of 50 to 120 ° C.

The extruder used for producing the elastic flooring material of the present invention is not particularly limited as long as it has an upper plate nozzle and a lower plate nozzle adjacent to each other in the vertical direction, for example, two extruders in close proximity to each other It is possible to use, and it is also possible to use one extruder with two barrels and two plate nozzles (or T-dies). In general, the extruder is a drive unit, a feeder (feeder). It consists of a screw, a barrel, and a nozzle (or die), and includes a single screw extruder, a twin screw extruder, and the like in the present invention. It is desirable to. The twin screw extruder has a wider range of material content that can be processed than the single screw extruder, and can control the precise reaction according to the temperature distribution of the barrel, the screw configuration, and the shape of the die.

In addition, the composition for upper extrusion or the composition for lower extrusion may be prepared by kneading the components in a kneader separate from the extruder, or may be prepared by kneading in a barrel in the extruder. The composition for top extrusion is extruded and foamed at a temperature of 150 to 250 ° C. through an upper plate nozzle to form an upper extrusion foam sheet, and at the same time the composition for lower extrusion is extruded at a temperature of 150 to 250 ° C. through a lower plate nozzle. And foamed to form a bottom extruded foam sheet. At this time, the extrusion temperature is preferably 150 to 250 ° C, preferably 180 to 230 ° C. If the extrusion temperature is less than 150 ° C, a part of the constituents are not melted and foaming is not performed smoothly. There exists a possibility that this will fall and surface uniformity of an extruded sheet will become inferior. In addition, if the extrusion temperature exceeds 250 ℃ unnecessary energy is consumed to increase the manufacturing cost, the temperature of the extruded sheet is too high, the process control such as pattern formation during the subsequent rolling and bonding process is not smooth and the extruded sheet There is a risk of sticking to the roller surface. In addition, the extrusion speed is represented by the rotational speed of the screw in the extruder, the range is not limited to, for example, 200 to 800 rpm, preferably 300 to 700 rpm, more preferably 400 to 600 rpm to be.

The upper extruded foam sheet and the lower extruded foam sheet, which are extruded and foamed through adjacent upper and lower plate nozzles, have a temperature similar to the extrusion temperature, and thermoplastic elastomers and unvulcanized materials contained in the upper extruded foam sheet and the lower extruded foam sheet. EPDM rubber, polyolefin, etc. have fluidity so that subsequent rolling and adhesion can be made smoothly. Specifically, the upper extruded foam sheet is laminated on the lower extruded foam sheet and passed between the upper press roller and the lower press roller to roll and bond the upper extruded foam sheet and the lower extruded foam sheet to obtain a composite sheet, wherein the upper roller surface There is preferably formed an embossing pattern consisting of a plurality of protrusions or bends. The pattern formed on the upper roller surface forms a plurality of protrusions or bends, that is, embossing patterns, on the upper surface of the upper extruded foam sheet to prevent slipping. In addition, a plurality of protrusion patterns are preferably formed on the lower roller surface in a lattice form, and a plurality of grooves are formed on the lower surface of the lower extruded foam sheet by a pattern formed on the lower roller surface.

Thereafter, the composite sheet is transferred to the annealing chamber and annealed at a temperature of 50 to 120 ° C., preferably 60 to 100 ° C., preferably cooled by a cooling roller before the annealing treatment (not shown in the drawing). The annealing treatment evens out the internal structure of the composite sheet, removes internal cracks, and removes stress. Annealing time is not restrict | limited greatly, For example, 5 to 60 minutes, Preferably 10 to 30 minutes are suitable. After passing through the annealing chamber, the composite sheet is cooled again, cut into a predetermined size, and used as an elastic flooring material.

Hereinafter, the present invention will be described in more detail with reference to Examples. However, the following examples are only for clearly illustrating the present invention, and do not limit the protection scope of the present invention.

1. Manufacture of elastic flooring

Example 1.

A twin screw extruder having two top plate nozzles and a bottom plate nozzle adjacent to two barrels vertically was prepared. The width of the upper plate nozzle and the lower plate nozzle was 650 mm.

100 parts by weight of a block copolymer of ethene and 1-octene (product name: INFUSE; supplier: The Dow Chemical Company, USA), 50 parts by weight of unvulcanized EPDM rubber (product name: KEP-570C; supplier: Kumho Polychem, Korea) 70 parts by weight of high density polyethylene (product name: LUTENE-H; supplier: LG Chem, Korea), 150 parts by weight of liquid paraffin (product name: N220; supplier: GS Caltex, Korea), 300 parts by weight of calcium carbonate powder having a particle size of 10 μm or less, 10 parts by weight of pigment, UV stabilizer (product name: Tinuvin; supplier: BASF, Germany) 1 part by weight, 1 part by weight of antioxidant (product name: Irganox; supplier: BASF, Germany) and 7 parts by weight of azodicarbonamide with a blowing agent The composition for top extrusion was prepared and extruded and foamed through the top plate nozzle to form a top extrusion foam sheet. At the same time, 100 parts by weight of waste vulcanized EPDM rubber powder (Supplier: Poly One, Korea) with 100 parts by weight of SBS block copolymer (Product name: KRT Series; Supplier: Kumho Petrochemical, Korea) and a particle size of 500 µm or less, unvulcanized 40 parts by weight of EPDM rubber (product name: KEP-570C; supplier: Kumho Polychem, Korea), 50 parts by weight of high density polyethylene (product name: LUTENE-H; supplier: LG Chem, Korea), 50 parts by weight of liquid paraffin (product name: N220; supplier: GS Caltex, Korea) 100 parts by weight, 200 parts by weight of calcium carbonate powder having a particle size of 10 μm or less, 1 part by weight of an antioxidant (product name: Irganox; supplier: BASF, Germany) and 15 parts by weight of azodicarbonamide with a blowing agent The composition for extrusion was prepared, extruded and foamed through a bottom plate nozzle, and molded into a bottom extruded foam sheet. At this time, the extrusion temperature was about 200 ~ 210 ℃, the extrusion speed was 500 rpm based on the screw speed. In addition, the waste vulcanized EPDM rubber powder is finely powdered waste vulcanized EPDM rubber scrap by a high temperature shear grinding method, characterized in that the microporous pore structure is formed on the surface of the powder and chemically activated.

The upper extruded foam sheet was then laminated onto the lower extruded foam sheet and passed between the upper press roller and the lower press roller to roll and bond the upper extruded foam sheet and the lower extruded foam sheet to obtain a composite sheet. At this time, an embossing pattern consisting of a plurality of bends is formed on the upper pressurizing roller surface, and a plurality of protrusion patterns are formed on the lower roller surface in a lattice form, whereby a plurality of bends are formed on the upper surface of the composite sheet. On the lower surface of the composite sheet, a plurality of grooves are formed in a lattice form.

Thereafter, the composite sheet was cooled by passing through a cooling roller (roller with cooling water flowing on the surface) and annealed at a temperature of about 80 ° C. for about 15 minutes in an annealing chamber to prepare an elastic flooring material.

The elastic floor covering had a width of 640 ± 10 mm and a total thickness of about 13 mm. The thickness of the upper sheet constituting the elastic floor covering was about 4 mm, and the thickness of the lower sheet was about 9 mm.

Example 2.

100 parts by weight of SBS block copolymer (product name: KRT Series; supplier: Kumho Petrochemical, Korea) as a composition for top extrusion, 50 parts by weight of unvulcanized EPDM rubber (product name: KEP-570C; supplier: Kumho Polychem, Korea) 70 parts by weight of high density polyethylene (product name: LUTENE-H; supplier: LG Chem, Korea), 150 parts by weight of liquid paraffin (product name: N220; supplier: GS Caltex, Korea), 300 parts by weight of calcium carbonate powder having a particle size of 10 μm or less, 10 parts by weight of pigment, UV stabilizer (product name: Tinuvin; supplier: BASF, Germany) 1 part by weight, 1 part by weight of antioxidant (product name: Irganox; supplier: BASF, Germany) and 7 parts by weight of azodicarbonamide with blowing agent An elastic flooring material was manufactured in the same manner as in Example 1 except for using the same.

Example 3.

100 parts by weight of a block copolymer of ethene and 1-octene (product name: INFUSE; supplier: The Dow Chemical Company, USA), unvulcanized EPDM rubber (product name: KEP-570C; supplier: Kumho Polychem, Korea ), 20 parts by weight, high density polyethylene (product name: LUTENE-H; supplier: LG Chemical, Korea) 30 parts by weight, liquid paraffin (product name: N220; supplier: GS Caltex, Korea) 60 parts by weight, carbonic acid with a particle size of 10 μm or less 150 parts by weight of calcium powder, 5 parts by weight of pigment, 0.5 parts by weight of UV stabilizer (product name: Tinuvin; supplier: BASF, Germany), 0.5 parts by weight of antioxidant (product name: Irganox; supplier: BASF, Germany) and azodicarbon as blowing agent A waste vulcanized EPDM rubber powder having a particle size of 500 µm or less, 100 parts by weight of an SBS block copolymer (Product Name: KRT Series; Supplier: Kumho Petrochemical, Korea) as a composition for lower extrusion, using a mixture of 3 parts by weight of amide. Poly One, Korea) 80 weight , 20 parts by weight of unvulcanized EPDM rubber (product name: KEP-570C; supplier: Kumho Polychem, Korea), 20 parts by weight of high density polyethylene (product name: LUTENE-H; supplier: LG Chemical, Korea), liquid paraffin (product name: N220 ; Supplier: GS Caltex, Korea) 50 parts by weight, 100 parts by weight of calcium carbonate powder with a particle size of 10 μm or less, 0.5 parts by weight of antioxidant (product name: Irganox; supplier: BASF, Germany) and 7 parts by weight of azodicarbonamide as blowing agent An elastic flooring material was prepared in the same manner as in Example 1 except that the kneaded material was used.

Example 4.

100 parts by weight of a block copolymer of ethene and 1-octene (product name: INFUSE; supplier: The Dow Chemical Company, USA), unvulcanized EPDM rubber (product name: KEP-570C; supplier: Kumho Polychem, Korea ), 100 parts by weight, high density polyethylene (product name: LUTENE-H; supplier: LG Chemical, Korea) 100 parts by weight, liquid paraffin (product name: N220; supplier: GS Caltex, Korea) 200 parts by weight, carbonic acid with a particle size of 10 μm or less 400 parts by weight of calcium powder, 25 parts by weight of pigment, 2 parts by weight of UV stabilizer (product name: Tinuvin; supplier: BASF, Germany), 2 parts by weight of antioxidant (product name: Irganox; supplier: BASF, Germany) and azodicarbon as blowing agent A waste vulcanized EPDM rubber powder having a particle size of 500 µm or less (100 parts by weight of SBS block copolymer (product name: KRT Series; supplier: Kumho Petrochemical, Korea) as a composition for lower extrusion using a mixture of 10 parts by weight of amide. Poly One, Korea) 200 60 parts by weight, unvulcanized EPDM rubber (product name: KEP-570C; supplier: Kumho Polychem, Korea), 100 parts by weight of high density polyethylene (product name: LUTENE-H; supplier: LG Chem, Korea), liquid paraffin (product name: N220; Supplier: GS Caltex, Korea) 200 parts by weight, 400 parts by weight of calcium carbonate powder with a particle size of 10 μm or less, 2 parts by weight of antioxidant (product name: Irganox; supplier: BASF, Germany) and 20 parts by weight of azodicarbonamide as blowing agent An elastic flooring material was prepared in the same manner as in Example 1, except that the kneaded portion was used.

Comparative Example 1.

100 parts by weight of SBS block copolymer (product name: KRT Series; supplier: Kumho Petrochemical, Korea) as a composition for lower extrusion, 40 parts by weight of unvulcanized EPDM rubber (product name: KEP-570C; supplier: Kumho Polychem, Korea) 50 parts by weight of high density polyethylene (product name: LUTENE-H; supplier: LG Chemical, Korea), 100 parts by weight of liquid paraffin (product name: N220; supplier: GS Caltex, Korea), 200 parts by weight of calcium carbonate powder having a particle size of 10 μm or less, An elastic flooring material was prepared in the same manner as in Example 1, except that 1 part by weight of an antioxidant (product name: Irganox; supplier: BASF, Germany) and 15 parts by weight of azodicarbonamide were kneaded with a blowing agent.

Comparative Example 2

50 parts by weight of unvulcanized EPDM rubber (product name: KEP-570C; supplier: Kumho Polychem, Korea), 170 parts by weight of high density polyethylene (product name: LUTENE-H; supplier: LG Chem, Korea), liquid paraffin (Product Name: N220; Supplier: GS Caltex, Korea) 150 parts by weight, 300 parts by weight of calcium carbonate powder having a particle size of 10 μm or less, 10 parts by weight of pigment, UV stabilizer (Product name: Tinuvin; Supplier: BASF, Germany) 1 part by weight, Waste vulcanized EPDM rubber powder having a particle size of 500 µm or less as a composition for lower extrusion, using 1 part by weight of antioxidant (product name: Irganox; supplier: BASF, Germany) and 7 parts by weight of azodicarbonamide as a blowing agent. Polyone, Korea) 100 parts by weight, unvulcanized EPDM rubber (product name: KEP-570C; supplier: Kumho Polychem, Korea) 40 parts by weight, high density polyethylene (product name: LUTENE-H; supplier: LG Chemical, Korea) 150 Parts by weight, liquid paraffin (Product name: N2 20; supplier: GS Caltex, Korea) 100 parts by weight, 200 parts by weight of calcium carbonate powder having a particle size of 10 μm or less, 1 part by weight of antioxidant (product name: Irganox; supplier: BASF, Germany) and 15 parts by weight of azodicarbonamide as blowing agent An elastic flooring material was prepared in the same manner as in Example 1, except that the kneaded portion was used.

Comparative Example 3

50 parts by weight of unvulcanized EPDM rubber (product name: KEP-570C; supplier: Kumho Polychem, Korea), 70 parts by weight of high density polyethylene (product name: LUTENE-H; supplier: LG Chem, Korea), liquid paraffin (Product Name: N220; Supplier: GS Caltex, Korea) 150 parts by weight, 300 parts by weight of calcium carbonate powder having a particle size of 10 μm or less, 10 parts by weight of pigment, UV stabilizer (Product name: Tinuvin; Supplier: BASF, Germany) 1 part by weight, Waste vulcanized EPDM rubber powder having a particle size of 500 µm or less as a composition for lower extrusion, using 1 part by weight of antioxidant (product name: Irganox; supplier: BASF, Germany) and 7 parts by weight of azodicarbonamide as a blowing agent. Polyone Co., Ltd.) 100 parts by weight, unvulcanized EPDM rubber (product name: KEP-570C; supplier: Kumho Polychem, Korea) 40 parts by weight, high density polyethylene (product name: LUTENE-H; supplier: LG Chemical, Korea) 50 Parts by weight, liquid paraffin (Product name: N220 ; Supplier: GS Caltex, Korea) 100 parts by weight, 200 parts by weight of calcium carbonate powder with a particle size of 10 μm or less, 1 part by weight of antioxidant (product name: Irganox; supplier: BASF, Germany) and 15 parts by weight of azodicarbonamide as blowing agent Except that the kneaded material was used, the composition for upper extrusion and the composition for lower extrusion were extruded and foamed in the same manner as in Example 1. However, when the composition for the top extrusion and the composition for the bottom extrusion is used, molding into a continuous sheet is not smooth and breakage occurs in the extrusion foaming process.

2. Physical property test of elastic flooring

(1) form stability

The elastic flooring materials prepared in Examples 1 to 4 and Comparative Examples 1 and 2 were cut into sizes of 300 mm × 300 mm, respectively, to prepare test pieces, and the change in length over time was stored in a hot air dryer at about 60 ° C. The shape stability was evaluated by calculating the following dimensional change rate. In addition, the elastic flooring material manufactured by the vulcanization process using a continuous vulcanization device Rotocure (Product Name: Super X Performance 13㎜; Supplier: Mondo, USA; Main ingredients: NR natural rubber and BR rubber synthetic , SBR, EPDM material) was used, and the results of the morphological stability test are shown in Table 1.

% Change in dimension = (length before change-length after change) × 100 / length before change

division Elapsed time 21 days later Example 1 MD direction 0.54% CD direction 0.27% Example 2 MD direction 0.27% CD direction 0.21% Example 3 MD direction 1.02% CD direction 0.68% Example 4 MD direction 0.38% CD direction 0.22% Comparative Example 1 MD direction 1.33% CD direction 1.35% Comparative Example 2 MD direction 1.37% CD direction 1.41% Control group MD direction 1.08% CD direction 0.27%

In Table 1, "MD direction" means the extrusion direction of the upper sheet and the lower sheet constituting the elastic flooring material, "CD direction" means a direction perpendicular to the MD direction.

(2) wear resistance

The wear resistance of the elastic flooring materials prepared in Examples 1 to 4 and Comparative Examples 1 and 2 was measured using a wear resistance measuring instrument (product name: Rotary Abraser; supplier: Taber) (related standards: ASTM D3389-05 modified specifications). . In addition, the elastic flooring material manufactured by the vulcanization process using a continuous vulcanization device Rotocure (Product Name: Super X Performance 13㎜; Supplier: Mondo, USA; Main ingredients: NR natural rubber and BR rubber synthetic , SBR, EPDM material) was used.

The elastic flooring material was made into the test piece of diameter 150mm, the 1 kg _f additional abrasive stone roller was rotated here, and the degree of abrasion with respect to rotation speed was observed. The weight before and after the wear was measured, and the wear rate was calculated by the following equation, and the results are shown in Table 2.

% Wear = (test piece weight before test minus test piece weight) × 100 / test piece weight

division Revolutions 2,000 times Example 1 2.38% Example 2 2.48% Example 3 2.61% Example 4 3.23% Comparative Example 1 2.40% Comparative Example 2 3.46% Control group 2.59%

(3) shock absorption and vertical strain

For the elastic flooring materials prepared in Examples 1 to 4 and Comparative Examples 1 and 2, the force reduction and vertical deformation were calculated according to the "Track Facilities Testing Protocols" of the International Athletic Federation (IAAF). Measured. In addition, the elastic flooring material manufactured by the vulcanization process using a continuous vulcanization device Rotocure (Product Name: Super X Performance 13㎜; Supplier: Mondo, USA; Main ingredients: NR natural rubber and BR rubber synthetic , SBR, EPDM material) was used, and the results are shown in Table 3.

division Shock Absorption Rate (%) Vertical strain (mm) Example 1 38 1.4 Example 2 36 1.2 Example 3 40 1.6 Example 4 36 1.0 Comparative Example 1 33 0.45 Comparative Example 2 15 0.2 Control group 36 2.0

The International Track and Field Federation's (IAAF) impact absorption rate for elastic flooring used in track facilities is 35-50%, and the vertical strain criterion is 0.6-2.5 mm. As shown in Table 3, the elastic flooring material prepared in Examples 1 to 4 and the elastic flooring material used as a control satisfy the criteria for the impact absorption rate and the vertical strain of the International Athletic Federation (IAAF), but Comparative Example 1 And the elastic flooring prepared in Comparative Example 2 did not meet the criteria.

(4) mechanical properties

Tensile Strength at break and Elongation at break according to the "Track Facilities Testing Protocols" of the International Athletic Federation (IAAF) for the elastic flooring materials prepared in Examples 1-4 and Comparative Examples 1-2. break) was measured. In addition, the elastic flooring material manufactured by the vulcanization process using a continuous vulcanization device Rotocure (Product Name: Super X Performance 13㎜; Supplier: Mondo, USA; Main ingredients: NR natural rubber and BR rubber synthetic , SBR, EPDM material) was used, and the results are shown in Table 4.

division Tensile Strength at Break (MPa) Elongation at Break (%) Example 1 1.0 250 Example 2 1.1 225 Example 3 1.1 320 Example 4 0.9 205 Comparative Example 1 0.9 180 Comparative Example 2 0.6 25 Control group 0.8 88

The International Athletic Federation (IAAF) 's tensile strength at break is at least 0.5 MPa and the elongation at break is at least 40% for elastic flooring used in track facilities. As shown in Table 4, the elastic flooring material prepared in Examples 1 to 4 and the elastic flooring material used as a control meet the criteria for breaking tensile strength and elongation at break of the International Federation of Athletics Federations (IAAF), but Comparative Example 2 The elastic flooring material prepared in did not meet the fracture elongation criterion.

(5) sliding friction in wet state

The sliding friction in the wet state was measured according to the "Track Facilities Testing Protocols" of the International Athletic Federation (IAAF) for the elastic flooring materials prepared in Examples 1 to 4 and Comparative Examples 1 and 2 (related standards: ASTM D2047). -04). In addition, the elastic flooring material manufactured by the vulcanization process using a continuous vulcanization device Rotocure (Product Name: Super X Performance 13㎜; Supplier: Mondo, USA; Main ingredients: NR natural rubber and BR rubber synthetic , SBR, EPDM material) was used, and the results are shown in Table 5.

division Sliding friction in wet condition (scale value on TRRL machine) Example 1 52 Example 2 50 Example 3 47 Example 4 55 Comparative Example 1 51 Comparative Example 2 23 Control group 56

The IAAF wet sliding friction criterion for elastic flooring used in track installations is greater than 47 on a TRRL machine scale reading. As shown in Table 5, the elastic flooring material prepared in Examples 1 to 4 and the elastic flooring material used as a control satisfy the sliding friction criterion in wet state of the International Federation of Athletics Federations (IAAF), but are prepared in Comparative Example 2. One elastic floor was not satisfied.

Although the present invention has been described through the above embodiments as described above, the present invention is not necessarily limited thereto, and various modifications can be made without departing from the scope and spirit of the present invention. In addition, many modifications may be made to adapt a particular situation and material to the teachings of the invention without departing from the essential scope thereof. Therefore, the protection scope of the present invention should be construed as including all embodiments falling within the scope of the claims appended to the present invention.

Claims (12)

Comprising a composite sheet comprising a top sheet and a bottom sheet bonded to the top sheet and integrated;
The top sheet may include 10 to 100 parts by weight of ethylene propylene diene monomer rubber, 20 to 100 parts by weight of polyolefin, mineral oil 50 to 200 parts by weight, and calcium carbonate per 100 parts by weight of thermoplastic elastomer (TPE). Extruded foam sheet of the composition for upper extrusion comprising 100 to 400 parts by weight and 2 to 10 parts by weight of the blowing agent,
The lower sheet is 80 to 200 parts by weight of vulcanized rubber powder per 100 parts by weight of thermoplastic elastomer (TPE), 10 to 60 parts by weight of unvulcanized ethylene propylene diene monomer rubber, 10 to 100 parts by weight of polyolefin, mineral It is an extruded foam sheet of the composition for lower extrusion comprising 50 to 200 parts by weight of oil, 100 to 400 parts by weight of calcium carbonate and 5 to 20 parts by weight of blowing agent,
A plurality of protrusions or bends are formed on the upper surface of the upper sheet,
The thermoplastic elastomer (TPE) included in the top extrusion composition and the bottom extrusion composition may be a styrene-butadiene-styrene block copolymer, an olefin block copolymer, or a polyolefin elastomer (TPE). Polyolefin elastomer), characterized in that the elastic flooring.
The composition of claim 1, wherein the composition for top extrusion further comprises 5 to 30 parts by weight of pigment, 0.1 to 3 parts by weight of UV stabilizer, or 0.1 to 3 parts by weight of antioxidant per 100 parts by weight of thermoplastic elastomer (TPE). Elastic flooring, characterized in that.
The elastic flooring material of claim 1, wherein the lower extrusion composition further comprises 0.1 to 3 parts by weight of antioxidant per 100 parts by weight of thermoplastic elastomer (TPE).
The elastic flooring material according to any one of claims 1 to 3, wherein the olefin block copolymer is an ethene-octene block copolymer.
The elastic flooring material according to any one of claims 1 to 3, wherein the polyolefin contained in the top extrusion composition and the bottom extrusion composition is polyethylene or polypropylene.
The elastic flooring material according to any one of claims 1 to 3, wherein the vulcanized rubber powder included in the lower extrusion composition is vulcanized EPDM rubber (ethylene propylene diene monomer rubber) powder.
The elastic flooring material as claimed in claim 6, wherein the vulcanized EPDM rubber powder is waste vulcanized EPDM rubber powder.
The elastic flooring material according to claim 6, wherein the vulcanized EPDM rubber powder has a particle size of 500 µm or less.
The elastic flooring material according to claim 6, wherein the surface of the vulcanized EPDM rubber powder has a microporous pore structure.
The elastic flooring material according to any one of claims 1 to 3, wherein the mineral oil contained in the composition for upper extrusion and the composition for lower extrusion is a liquid paraffin.
The elastic agent according to any one of claims 1 to 3, wherein the blowing agent included in the composition for upper extrusion and the composition for lower extrusion is azodicarbonamide or sodium bicarbonate. Flooring.
The elastic flooring material according to any one of claims 1 to 3, wherein the lower sheet lower surface has a plurality of grooves formed in a lattice shape.

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