KR20140013125A - Environmental friendly elastic floor material - Google Patents

Abstract

The present invention relates to an elastic floor material formed into a composite sheet comprising an upper sheet and a lower sheet integrally bonded thereto, wherein the upper sheet is the extruded foam sheet of an upper extrusion composition containing 100 parts by weight of a thermoplastic elastomer (TPE), 10 to 100 parts by weight of a non-vulcanized ethylene propylene diene monomer (EPDM) 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 a foaming agent, and the lower sheet is the extruded foam sheet of a lower extrusion composition containing 100 parts by weight of the thermoplastic elastomer (TPE), 80 to 200 parts by weight of vulcanized rubber powder, 10 to 60 parts by weight of the non-vulcanized ethylene propylene diene monomer (EPDM) rubber, 10 to 100 parts by weight of polyolefin, 50 to 200 parts by weight of the mineral oil, 100 to 400 parts by weight of calcium carbonate, and 5 to 20 parts by weight of the foaming agent. According to the present invention, the upper extrusion composition, the lower extrusion composition, or both thereof further contain Kenaf fibers so that the eco-friendly elastic floor material can be provided, wherein the Kenaf fiber is a natural fiber.

Description

Environment Friendly Elastic Floor Material {Environmental Friendly Elastic Floor Material}

The present invention relates to an environmentally friendly elastic flooring material containing natural materials and a method for manufacturing the same, and more particularly, it can be installed on the floor of a sports facility such as a playground, a playground, a park, etc. to provide functions such as shock absorption and anti-slip. It relates to an environmentally friendly elastic flooring material and a method of manufacturing the same using an ordinary 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 and convenient to construct, 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 radiant heat in summer It is to minimize the occurrence. 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, buses and taxi stands, especially for infants, children, the elderly and the disabled. It is also used in safety facilities, apartments, school grounds, children's playgrounds and child care centers where there are frequent activities.

The use of such elastic flooring is rapidly increasing due to its usefulness, thereby increasing the interest in environmentally friendly materials.

Elastomeric flooring materials are used in composite materials containing various compounding agents such as hardeners and curing accelerators in the pulverized elastic materials such as polyurethane, epoxy, recycled urethane, ethylene propylene diene monomer rubber, PVC, waste tires and waste rubber. It is vulcanized and manufactured in sheet form. Such a vulcanization process can improve the elasticity and durability, but typically, even after the vulcanization process, reinforcing materials are additionally added to increase physical properties and performance as elastic flooring materials. Carbon black is the most used as such reinforcing material, but it is obtained from fossil fuel, and its amount is not so small that there is a problem of increasing the amount of fossil fuel. Therefore, there is a need to develop alternative reinforcement materials that are environmentally friendly and do not cause problems such as environmental pollution due to the use of fossil fuels and also satisfy the properties required as elastic flooring materials such as carbon black.

On the other hand, the continuous floor vulcanization apparatus such as Rotocure (Rotocure) is used for mass production of such elastic flooring, which results in a complicated manufacturing process and problems such as manufacturing cost increase 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.

Accordingly, an object of the present invention is to provide an elastic flooring material having a natural material and excellent mechanical properties that should be retained as an elastic flooring material.

In addition, the present invention can be produced by a conventional extruder instead of a continuous vulcanizing device, and the morphological stability, wear resistance, light resistance, impact absorption, vertical strain, mechanical properties (eg It is another object of the present invention to provide an elastic flooring material capable of simultaneously satisfying tensile strength, elongation, and the like. Particularly, another 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 functions.

In addition, the present invention is excellent in shape stability, abrasion resistance, light resistance, impact absorption rate, vertical strain, mechanical properties (for example, tensile strength, elongation, etc.) by a simple extruder instead of a continuous vulcanization apparatus, with a simple process and low manufacturing cost. It is another object to provide a method for producing an elastic flooring material.

In order to achieve the above objects, the present invention is composed of a composite sheet comprising a top sheet and a bottom sheet adhered to and integrated with the top sheet, wherein the top sheet is less than 100 parts by weight of a thermoplastic elastomer (TPE). Sulfur EPDM rubber (ethylene propylene diene monomer rubber) 10-100 parts by weight, polyolefin 20-100 parts by weight, mineral oil 50-200 parts by weight, 100-400 parts by weight calcium carbonate and 2-10 parts by weight of blowing agent Extruded foam sheet of the composition, 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, polyolefin 10 to 100 parts by weight, 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 the blowing agent is an extruded foam sheet of the composition for lower extrusion, Group than the upper extrusion composition or composition for the lower extrusion or approached to provide a natural fiber of kenaf (Kenaf) to the Eco resilient flooring further comprises a fiber.

According to a preferred embodiment of the present invention, the kenaf fiber is preferably contained in an amount of 0.01 to 30 parts by weight based on the total weight of the unvulcanized EPDM rubber in the composition for top extrusion.

According to another suitable embodiment of the present invention, the kenaf fiber is preferably included in the composition for lower extrusion, 0.01 to 30 based on the total weight of the vulcanized rubber powder or unvulcanized rubber powder or both of the composition for lower extrusion. It is preferable that a weight part is included.

According to another suitable embodiment of the present invention, it is preferable that a plurality of protrusions or bends are formed on the upper sheet upper surface, and a plurality of grooves are formed on the lower sheet lower surface in a lattice form.

The elastic flooring material according to the present invention contains natural fibers, which are environmentally friendly and generally require properties of morphological stability, wear resistance, light resistance, impact absorption, vertical strain, mechanical properties (eg tensile strength, elongation, etc.), and the like. All of them are excellent and can be applied to sports facilities such as playgrounds, playgrounds, parks, etc. In particular, the shock absorbing function as well as the anti-slip function added to the elastic flooring can prevent accidents of infants, children, the elderly, disabled people.

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 an upper surface of an elastic flooring material 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 is not limited or limited to the following preferred example can be implemented by those skilled in the art.

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 an elastic flooring material containing natural fibers, while being environmentally friendly and excellent in shape stability and mechanical properties. 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 material according to the present invention is mainly composed of an olefin-based material having strong weather resistance and heat resistance so as to withstand the weather and friction with the user for a long time as the part exposed to the outside when the elastic flooring material is constructed. 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 strong 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. The present invention is characterized in that the composition of the top sheet or the composition of the bottom sheet having such a composition, or both, includes Kenaf fibers, which are natural fibers.

Kenaf (Hibiscus cannabinus L.) fiber, also known as sheep, is a herbaceous herbaceous plant native to West Africa, one of the world's three largest fiber crops, and is widely regarded as a plant material for various biomaterials. . It is a natural fiber that has received the most attention in the field of green composite material because it grows fast and has a relatively large amount of carbon dioxide absorption in the air compared to other natural fibers. The kenaf fiber can be used as it is or natural surface modification. Even if the surface is contained in the composition of the upper sheet and the lower sheet of the present invention without modification, the dispersion may be easily performed. However, the surface may be modified to improve adhesion to the thermoplastic elastomer. Surface modification can be either physical or chemical and can be by any known method known in the art.

Kenaf fiber included in the elastic flooring of the present invention may be included 0.01 to 30 parts by weight based on the total weight of the unvulcanized EPDM rubber of the composition for the top extrusion. In addition, the kenaf fiber may be contained 0.01 to 30 parts by weight based on the total weight of the vulcanized rubber powder or unvulcanized rubber powder or both of the composition for bottom extrusion. In all cases, if the kenaf fiber is included in less than 0.01 parts by weight, the environmentally friendly effect is insignificant, and if it exceeds 30 parts by weight, excessive elasticity is lost and there is a problem in that physical properties as an elastic flooring material cannot be represented.

The thermoplastic elastomer (TPE) contained in the composition for upper extrusion of the present invention and the composition for lower extrusion is an elastomer which is physically crosslinked without vulcanization, and is also referred to as thermoplastic rubber. A thermoplastic elastomer (TPE) is a block copolymer composed mainly of a soft segment of a rubber component and a hard segment of a resin component, and behaves like the vulcanized rubber at room temperature. However, when heated, the resin component softens and shows firing. 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. Block copolymer) or a polyolefin elastomer (polyolefin elastomer) is composed of one or more, the thermoplastic elastomer used in the composition for the double top extrusion is SBS block copolymer (styrene-butadiene-styrene block copolymer) or olefin block copolymer (olefin block copolymer), and the thermoplastic elastomer used in the composition for lower extrusion is preferably SBS block copolymer (styrene-butadiene-styrene block copolymer). The olefin block copolymer is preferably a block copolymer of ethene and an? -Olefin, more preferably an ethene-octene block copolymer (specifically a block copolymer of ethene and 1-octene) And INFUSE ™ from The Dow Chemical Company, US. The polyolefin elastomer is a homogeneously branched copolymer of ethene and an? -Olefin. Examples of the? -Olefin include 1-butene, 1-hexene, 4-methyl-1-heptene, - Dechen, 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 and the moldability to the sheet, the vulcanized EPDM rubber powder preferably has a particle size of 500 μm or less (for example, 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. 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 apparatus for high temperature microfinefaction of a vulcanized rubber material is characterized in that a reverse helical shearing crushing unit and a holding pressure crushing unit are formed in a high temperature shearing crusher for imparting chemical reactivity to the surface of rubber particles simultaneously with high temperature shearing. Here, the holding pressure crushing section 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. Mechanical pressure and thermal energy due to the shear force accumulate as internal energy of the input material, and pressure and temperature are further increased as they are introduced into the inlet of the reverse helical shear crushing section. 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. The waste material to be used as the raw material is a vulcanized rubber material such as ethylene propylene diene monomer rubber scrap which is irreversibly vulcanized and is not recyclable unlike the thermoplastic plastic material. For example, a detailed method of obtaining a pulverized rubber vulcanized rubber powder by a high-temperature shear grinding method will be described in detail. First, the waste vulcanized rubber material generated during the molding process such as press, extrusion or injection is recovered, pulverized by a usual low-speed pulverizer or the like, and pulverized at a particle size of about 10 to 30 mm. The pulverized waste vulcanized rubber material is introduced into the material inlet and is transported by the first cylinder. At this time, shear friction is generated by the projection formed on the helical of the second screw and the lattice-shaped corrugated groove formed on the inner surface of the first cylinder, And is conveyed toward the second cylinder while the compression is being weighted at the same time. The pulp vulcanized rubber material is filled and compressed due to the pitch of the helical reduced at the rear end of the first screw. The transported vulcanizing vulcanized rubber material stays in the reverse direction at the reverse helical shearing portion of the second screw to become compact and more compactly compressed. The internal temperature rises during the compression of the waste vulcanized rubber material. However, the thermal energy accumulated due to the characteristics of the waste vulcanized rubber material is not reacted in the direction of increasing the entropy thermodynamically due to melting, unlike the thermoplastic material, The internal energy accumulated inside the material is converted to heat and pressure and reaches a critical point at a certain level. The internal energy accumulated in the waste vulcanized rubber material is instantaneously released at the end of the reverse helical shearing unit by an energy that continues to accumulate after reaching the critical point, and energy is simultaneously radiated. At the same time, Secondary pulverization is carried out while 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 holding-pressure crushing part is finally discharged through the discharge port 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 a microporous pore structure is formed on the surface of the powder to chemically activate it. It is. 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 is 10 in consideration of compatibility with other components, processability and moldability, etc. It is preferable that it is micrometer or less. The calcium carbonate used in the present invention is preferably a commercial product provided in a purified form of marble, limestone, calcite, and shell from the viewpoint of economy. 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 for imparting elasticity and heat resistance, the type is not particularly limited as long as it is commonly used or known. In consideration of compatibility with other components, commercial availability, foaming properties, etc., it is preferable to be composed of one or more selected from azodicarbonamide or sodium bicarbonate, and azodicarbonamide More preferably). 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 ultraviolet stabilizer has a function of blocking or absorbing ultraviolet rays, and is preferably a halase (HALS) based material in consideration of its performance as a 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 Corporation). 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 material according to the present invention has a plurality of grooves 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 material and the reduction of manufacturing cost as shown in FIG. It is preferably 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.

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). Generally, the extruder is a driving part, a feeder. It consists of a screw, a barrel, and a nozzle (or die), and the type thereof includes a single screw extruder, a twin screw extruder, and the like. In the present invention, a twin screw extruder is used. It is preferable. The twin screw extruder has a wider range of material content that can be processed than the single screw extruder, and can control precise reactions according to changes in barrel temperature distribution, screw configuration, and die shape, and consumes less power.

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, more preferably 180 to 230 ° C. If the extrusion temperature is less than 150 ° C, the constituent components are not partially melted and the foaming is not smooth, And the surface uniformity of the extruded sheet may become poor. 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, an upper extruded foamed sheet is laminated on a lower extruded foamed sheet and passed between upper and lower pressure rollers to roll and adhere the upper extruded foamed sheet and the lower extruded foamed sheet to obtain a composite sheet, An embossing pattern composed of a plurality of projections or bends is preferably formed. The upper surface of the upper extruded foam sheet is formed with a plurality of protrusions or bends, i.e., an embossing pattern, for anti-slip by the pattern formed on the upper roller surface. A plurality of protruding patterns are formed on the surface of the lower roller, which are repeated in a lattice pattern. A plurality of grooves are formed on the lower surface of the lower extruded foam sheet in a lattice pattern 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). By the annealing treatment, the internal structure of the composite sheet is uniformed, the internal cracks are removed, and the stress is removed. 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 intended to clearly illustrate the present invention and do not limit the scope of protection of the present invention.

1. Manufacture of elastic flooring

Example  One

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) Kennef fiber 0.003 parts by weight, high density polyethylene (product name: LUTENE-H; supplier: LG Chemical, Korea) 70 parts by weight, liquid paraffin (product name: N220; supplier: GS Caltex, Korea) 150 parts by weight, particle size less than 10㎛ 300 parts by weight of calcium carbonate powder, 10 parts by weight of pigment, 1 part by weight of UV stabilizer (product name: Tinuvin; supplier: BASF, Germany), 1 part by weight of antioxidant (product name: Irganox; supplier: BASF, Germany) and azodica as blowing agent 7 parts by weight of the main amide was kneaded to prepare a composition for top extrusion, and was extruded and foamed through a 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.

Thereafter, the upper extruded foam sheet was laminated on the lower extruded foam sheet and passed between the upper pressure roller and the lower pressure roller to roll and adhere 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 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) 7.5 parts by weight of Kennef fiber, 70 parts by weight of high density polyethylene (product name: LUTENE-H; supplier: LG Chemical, Korea), 150 parts by weight of liquid paraffin (product name: N220; supplier: GS Caltex, Korea), with a particle size of 10 μm or less 300 parts by weight of calcium carbonate powder, 10 parts by weight of pigment, 1 part by weight of UV stabilizer (product name: Tinuvin; supplier: BASF, Germany), 1 part by weight of antioxidant (product name: Irganox; supplier: BASF, Germany) and azodica as blowing agent An elastic flooring material was prepared in the same manner as in Example 1, except that 7 parts by weight of amide was kneaded.

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  3

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) Kennef fiber 15 parts by weight, high density polyethylene (product name: LUTENE-H; supplier: LG Chemical, Korea) 70 parts by weight, liquid paraffin (product name: N220; supplier: GS Caltex, Korea) 150 parts by weight, particle size less than 10㎛ 300 parts by weight of calcium carbonate powder, 10 parts by weight of pigment, 1 part by weight of UV stabilizer (product name: Tinuvin; supplier: BASF, Germany), 1 part by weight of antioxidant (product name: Irganox; supplier: BASF, Germany) and azodica as blowing agent An elastic flooring material was prepared in the same manner as in Example 1, except that 7 parts by weight of amide was kneaded.

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  4

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), 0.01 part by weight of Kennef fiber, 50 parts by weight of high density polyethylene (product name: LUTENE-H; supplier: LG Chemical, Korea), 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 antioxidant (product name: Irganox; supplier: BASF, Germany) and azodicarbon as blowing agent 15 parts by weight of the amide was kneaded to prepare a composition for bottom extrusion, which was extruded and foamed through a bottom plate nozzle to form a bottom extrusion 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.

Thereafter, the upper extruded foam sheet was laminated on the lower extruded foam sheet and passed between the upper pressure roller and the lower pressure roller to roll and adhere 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  5

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) as a lower extrusion composition, Unvulcanized EPDM Rubber (Product Name: KEP-570C; Supplier: Kumho Polychem, Korea) 40 parts by weight, Kenef Fiber 15 parts by weight, High Density Polyethylene (Product Name: LUTENE-H; Supplier: LG Chemical, Korea) 50 parts by weight, 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, 1 part by weight of antioxidant (product name: Irganox; supplier: BASF, Germany) and azo as a blowing agent An elastic flooring material was prepared in the same manner as in Example 4, except that 15 parts by weight of dicarbonamide was kneaded.

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  6

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) as a lower extrusion composition, Unvulcanized EPDM Rubber (Product Name: KEP-570C; Supplier: Kumho Polychem, Korea) 40 parts by weight, Kenef Fiber 30 parts by weight, High Density Polyethylene (Product Name: LUTENE-H; Supplier: LG Chem, Korea) 50 parts by weight, 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, 1 part by weight of antioxidant (product name: Irganox; supplier: BASF, Germany) and azo as a blowing agent An elastic flooring material was prepared in the same manner as in Example 4, except that 15 parts by weight of dicarbonamide was kneaded.

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  7

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), 0.014 part by weight of Kennef fiber, 50 parts by weight of high density polyethylene (product name: LUTENE-H; supplier: LG Chem, Korea), 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 antioxidant (product name: Irganox; supplier: BASF, Germany) and azodicarbon as blowing agent 15 parts by weight of the amide was kneaded to prepare a composition for bottom extrusion, which was extruded and foamed through a bottom plate nozzle to form a bottom extrusion 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.

Thereafter, the upper extruded foam sheet was laminated on the lower extruded foam sheet and passed between the upper pressure roller and the lower pressure roller to roll and adhere 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  8

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) as a lower extrusion composition, Unvulcanized EPDM Rubber (Product Name: KEP-570C; Supplier: Kumho Polychem, Korea) 40 parts by weight, Kenneth Fiber 21 parts by weight, High Density Polyethylene (Product Name: LUTENE-H; Supplier: LG Chemical, Korea) 50 parts by weight, 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, 1 part by weight of antioxidant (product name: Irganox; supplier: BASF, Germany) and azo as a blowing agent An elastic flooring material was prepared in the same manner as in Example 4, except that 15 parts by weight of dicarbonamide was kneaded.

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  9

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) as a lower extrusion composition, Unvulcanized EPDM Rubber (Product Name: KEP-570C; Supplier: Kumho Polychem, Korea) 40 parts by weight, Kenneth Fiber 42 parts by weight, High Density Polyethylene (Product Name: LUTENE-H; Supplier: LG Chemical, Korea) 50 parts by weight, 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, 1 part by weight of antioxidant (product name: Irganox; supplier: BASF, Germany) and azo as a blowing agent An elastic flooring material was prepared in the same manner as in Example 4, except that 15 parts by weight of dicarbonamide was kneaded.

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  10

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) 7.5 parts by weight of Kennef fiber, 70 parts by weight of high density polyethylene (product name: LUTENE-H; supplier: LG Chemical, Korea), 150 parts by weight of liquid paraffin (product name: N220; supplier: GS Caltex, Korea), with a particle size of 10 μm or less 300 parts by weight of calcium carbonate powder, 10 parts by weight of pigment, 1 part by weight of UV stabilizer (product name: Tinuvin; supplier: BASF, Germany), 1 part by weight of antioxidant (product name: Irganox; supplier: BASF, Germany) and azodica as blowing agent 7 parts by weight of the main amide was kneaded to prepare a composition for top extrusion, and was extruded and foamed through a 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), 15 parts by weight of Kenef Fiber, 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 having a particle size of 10 μm or less, 1 part by weight of antioxidant (product name: Irganox; supplier: BASF, Germany) and azodicarbon as blowing agent 15 parts by weight of the amide was kneaded to prepare a composition for bottom extrusion, which was extruded and foamed through a bottom plate nozzle to form a bottom extrusion 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.

Thereafter, the upper extruded foam sheet was laminated on the lower extruded foam sheet and passed between the upper pressure roller and the lower pressure roller to roll and adhere 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.

Comparative Example

The same procedure as in Example 1 was conducted except that no Kenef fibers were used.

2. Physical property test of elastic flooring

(1) form stability

The elastic flooring materials prepared in Examples 1 to 10 and Comparative Examples were cut to a size of 300 mm × 300 mm, respectively, to prepare a test piece, and the change in length over time was observed while storing in a hot air dryer at about 60 ° C., Shape stability was evaluated by calculating the following rate of dimensional change. 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.

Dimensional change ratio (%) = (length before change - length after change) x 100 / length before change

division Elapsed time After 21 days Example 1 MD direction 0.27% CD direction 0.21% Example 2 MD direction 0.38% CD direction 0.22% Example 3 MD direction 0.55% CD direction 0.28% Example 4 MD direction 0.36% CD direction 0.28% Example 5 MD direction 0.46% CD direction 0.33% Example 6 MD direction 0.54% CD direction 0.29% Example 7 MD direction 0.50% CD direction 0.26% Example 8 MD direction 0.48% CD direction 0.30% Example 9 MD direction 0.52% CD direction 0.29% Example 10 MD direction 0.47% CD direction 0.29% Comparative Example 1 MD direction 0.54% CD direction 0.27% 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. According to the results of Table 1, Examples 1 to 10 were found to exhibit similar morphological stability as in Comparative Example 1, Examples 1 to 10 were found to have good morphological stability in both the MD direction and CD direction compared to the control group. .

(2) wear resistance

The wear resistance of the elastic flooring materials prepared in Examples 1 to 10 and Comparative Examples was measured using a wear resistance measuring instrument (trade name: Rotary Abraser; supplier: Taber) (related standards: ASTM D3389-05 modified specification). 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 kgf 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 2000 times Example 1 2.48% Example 2 2.62% Example 3 2.77% Example 4 2.33% Example 5 2.59% Example 6 2.57% Example 7 2.65% Example 8 2.58% Example 9 2.59% Example 10 2.60% Comparative Example 2.38% Control group 2.59%

(3) Shock Absorption Rate and Vertical Deformation

For the elastic flooring prepared in Examples 1 to 10 and Comparative Examples, the Force Reduction and the Vertical Deformation were measured according to the "Track Facilities Testing Protocols" of the International Athletic Federation (IAAF). 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 40 1.6 Example 2 38 1.6 Example 3 36 1.4 Example 4 41 1.5 Example 5 36 1.2 Example 6 35 1.0 Example 7 38 1.5 Example 8 40 1.3 Example 9 39 1.8 Example 10 43 1.7 Comparative Example 38 1.4 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 10, the elastic flooring material used as a comparative example and a control group, satisfy the criteria for the impact absorption rate and the vertical strain of the International Federation of Athletics Federations (IAAF). . Compared with the comparative example containing no natural fiber, it was shown that the Examples 1 to 10 contained natural fiber material had excellent performance as an elastic flooring material in which environmental friendliness was improved.

(4) Mechanical properties

Tensile strength at break and elongation at break were determined for the elastic flooring materials prepared in Examples 1 to 10 and Comparative Examples 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 4.

division Tensile Strength at Break (WPa) Elongation at Break (%) Example 1 1.2 286 Example 2 1.1 260 Example 3 0.9 250 Example 4 1.1 290 Example 5 1.0 285 Example 6 1.0 270 Example 7 1.2 291 Example 8 1.1 268 Example 9 0.9 289 Example 10 1.3 277 Comparative Example 1.0 250 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 10, the elastic flooring material used as a comparative example and a control group, satisfy the criteria for breaking tensile strength and elongation at break of the International Federation of Athletics Federations (IAAF). . Compared with the comparative example without the natural fiber, Examples 1 to 10 containing the natural fiber material and improved environmental friendliness were found to have similarly excellent performance as the elastic flooring material.

(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 10 and Comparative Examples (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 Classification Slip friction in wet condition (scale value on TRRL machine) Example 1 50 Example 2 52 Example 3 47 Example 4 53 Example 5 51 Example 6 49 Example 7 48 Example 8 51 Example 9 50 Example 10 47 Comparative Example 52 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 10, the elastic flooring material used as the comparative example and the control group, satisfy the sliding friction criterion in the wet state of the International Federation of Athletics Federations (IAAF). Compared with the comparative example without the natural fiber, Examples 1 to 10 containing the natural fiber material and improved environmental friendliness were found to have similarly excellent performance as the elastic flooring material.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. 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 (17)

A composite sheet comprising an upper sheet and a lower sheet bonded to the upper sheet,
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,
Eco-friendly elastic flooring, characterized in that the composition for the upper extrusion or the composition for lower extrusion or both further comprises Kenaf (Kenaf) fibers.
The method of claim 1,
The Kenaf fibers are eco-friendly elastic flooring, characterized in that 0.01 to 30 parts by weight based on the total weight of the unvulcanized EPDM rubber of the composition for the top extrusion.
The method of claim 1,
The Kenaf fiber is an environmentally friendly elastic flooring, characterized in that it is included in the composition for bottom extrusion.
The method of claim 3,
The Kenaf fiber is an eco-friendly elastic flooring material, characterized in that 0.01 to 30 parts by weight based on the total weight of the vulcanized rubber powder or unvulcanized rubber powder or both of the composition for the bottom extrusion.
The method of claim 1,
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 method of claim 1,
The composition for the 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).
The method of claim 1,
The bottom extrusion composition further comprises 0.1 to 3 parts by weight of antioxidant per 100 parts by weight of thermoplastic elastomer (TPE).
8. The method according to any one of claims 1 to 7,
The olefin block copolymer (olefin block copolymer) is an elastic flooring, characterized in that the ethene-octene block copolymer.
8. The method according to any one of claims 1 to 7,
The polyolefin included in the composition for upper extrusion and the composition for lower extrusion is elastic flooring, characterized in that the polyethylene or polypropylene.
8. The method according to any one of claims 1 to 7,
The vulcanized rubber powder included in the lower extrusion composition is a vulcanized EPDM rubber (ethylene propylene diene Monomer rubber) powder, characterized in that the elastic flooring.
The method of claim 10,
The vulcanized EPDM rubber (ethylene propylene diene Monomer rubber) powder is an elastic flooring, characterized in that the waste vulcanized EPDM rubber (ethylene propylene diene Monomer rubber) powder.
The method of claim 10,
The vulcanized EPDM rubber (ethylene propylene diene monomer rubber) powder is an elastic flooring, characterized in that the particle size is 500㎛ or less.
The method of claim 10,
The surface of the vulcanized EPDM rubber (ethylene propylene diene monomer rubber) powder has an elastic porous material, characterized in that it has a microporous pore structure.
8. The method according to any one of claims 1 to 7,
The mineral oil contained in the composition for upper extrusion and the composition for lower extrusion is elastic flooring, characterized in that the liquid paraffin.
8. The method according to any one of claims 1 to 7,
The foaming agent included in the composition for the top extrusion and the composition for the bottom extrusion elastic flooring, characterized in that azodicarbonamide or sodium bicarbonate.
8. The method according to any one of claims 1 to 7,
An elastic flooring material, characterized in that a plurality of projections or bends are formed on the upper surface of the upper sheet.
8. The method according to any one of claims 1 to 7,
An elastic flooring material, characterized in that a plurality of grooves are formed on the lower surface of the lower sheet to be repeated in a lattice form.

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