KR101880050B1 - Multiple-layered vibration proof pad and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a multiple anti-vibration pad and a method for manufacturing an anti-vibration pad, wherein the anti-vibration pad has a structure in which a first pad and a second pad having different physical properties are stacked. To form the first pad and the second pad, natural rubber (NR) or ethylene-propylene rubber (EP), liquid isoprene rubber (LIR) or chloroprene rubber (CR), carbon black SRF (Semi-reinforcing Fumace Balck), calcium carbonate (cac03), compounded oil, zinc oxide (ZnO), stearic acid (S/T), M (MBT: 2-Mercapto benzo thiazole) of thiazole-based accelerators, TT (TMTD: Tetramethylthiuram Disulfide) of thiuram-based accelerators, sulfur (S), and cerium (CE) may be mixed. The anti-vibration pad of the present invention having the above-described components and structure is excellent in reducing external impact and vibration, has a small compression set, and has excellent aging resistance and heat resistance.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a multi-vibration pad and a multi-

The present invention relates to a multi-vibration pad and a method of manufacturing the multi-vibration pad. More particularly, the present invention relates to a multi-vibration pad and a method of manufacturing a multi-vibration pad that reduce vibration and impact using synthetic rubber.

Generally, structures such as subways, railways, tunnels, piers and the like have a problem that vibrations generated during operation of an automobile or a railway are transmitted to the floor or wall as they are, thereby shortening the internal life of the structure. Particularly recently, A dustproof structure or a reinforcing structure that can prevent the structure from being damaged is required.

Also, in buildings such as apartments, villas, houses, etc., various means are used to reduce internal shocks or vibrations such as external shocks, vibrations, and interlayer noise such as earthquakes.

A vibration pad can be used between the floor or between the floors of a building or structure to reduce impacts and vibrations on the building or structure. The anti-vibration pad is formed by molding synthetic rubber such as natural rubber or neoprene rubber into a plate-shaped pad. When the pad is installed on the floor of a building or the like, the floor is formed into a double structure and then a vibration pad is placed therebetween. It can be used by attaching an anti-vibration pad to the area in contact with the ground.

The vibration damping pad used for the purpose of vibration isolation and impact absorption has high flexibility to rapidly dissipate vibrational energy into heat energy and has a high elasticity, so that it is preferable that the ratio of permanent compression when used for a long time is low. When the elastic force is low, the deformed portion is difficult to return to the original state due to the load, and thus the effect of reducing vibration and impact is greatly deteriorated.

However, there is a part where the elastic force and flexibility of the vibration-proof pad are in conflict with each other, so that the flexibility is low when the elastic force of the vibration-proof pad is high and the elastic force is low when the flexibility is high.

(Literature 0001) Korean Utility Model Registration No. 20-0296643 (Literature 0001) Korean Utility Model Publication No. 20-2014-0001880

It is an object of the present invention, which has been made in view of the above, to provide a method of manufacturing a multiple anti-vibration pad and an anti-vibration pad having a high elastic restoring force and an excellent shock absorption rate.

A further object of the present invention is to provide a multi-vibration pad and a method of manufacturing an anti-vibration pad that combines a highly flexible vibration pad with a highly elastic vibration pad to effectively reduce vibrations and impacts.

The multiple vibration damping pad of the present invention may be manufactured by using 45 to 50% by weight of a natural rubber (NR) or an ethylene-propylene rubber (EP), a liquid isoprene rubber (LIR) or a chloroprene rubber (Rubber) 4 to 6% by weight, carbon black 15 to 23% by weight of semi-reinforcing fumace balck, 7 to 12% by weight of calcium carbonate (cac03), 14 to 22% (TMTD) of 0.05 to 0.2% by weight of stearic acid (S / T), 0.2 to 0.4% by weight of M (MBT: 2-Mercapto benzo thiazole) as a thiazole accelerator, A first pad formed to contain 0.05 to 0.2% by weight of sulfur, 0.2 to 0.4% by weight of cerium (CE), sulfur (S), and the like; 50 to 55% by weight of a natural rubber (NR) or an ethylene-propylene rubber (EP), 2 to 4 by weight of a liquid isoprene rubber (LIR) or chloroprene rubber (CR) 15 to 23% by weight of carbon black SRF (Semi reinforcing Fumace Balck), 7 to 12% by weight of calcium carbonate (cac03), 14 to 22% by weight of compounded oil, 1 to 2% by weight of zinc oxide (ZnO) 0.2 to 0.4% by weight of M (MBT: 2-Mercapto benzo thiazole) as a thiazole accelerator, 0.05 to 0.2% by weight of TT (TMTD: Tetramethylthiuram disulfide) Wherein the first pad and the second pad are laminated in the vertical direction and the uppermost or lowermost pad is formed in a laminated structure including a first pad and a second pad which are formed from 0.05 to 0.2% by weight of cerium and 0.2 to 0.4% by weight of cerium, A first pad is provided.

The hardness of the first pad may be smaller than the hardness of the second pad, and the outer surface of the first pad provided at the uppermost or lowermost end may be provided with protrusions that are convexly outwardly formed and arranged in a lattice pattern.

The first pad and the second pad are alternately repeatedly arranged to form a composite sheet. A plurality of composite sheets are stacked in a vertical direction, and the first pad and the composite sheet The first and second pads of the first electrode and the second electrode may be stacked while being in contact with each other.

The apparatus may further include a load supporting member inserted into the first pad and contacting the second pad stacked adjacent to the upper or lower end thereof and including an elastic body.

The method for manufacturing the multiple anti-vibration pad of the present invention is characterized in that 45 to 50% by weight of natural rubber (NR) or ethylene-propylene rubber (EP) and 40 to 50% by weight of liquid isoprene rubber (LIR) or chloroprene rubber 4 to 6% by weight of CR (Chloroprene Rubber) are mixed at a temperature of 70 to 75 ° C to form a first mixture, and 50 to 55 wt% of natural rubber (NR: Natural Rubber) or ethylene- And 2 to 4% by weight of a liquid isoprene rubber (LIR) or a chloroprene rubber (CR) at a temperature of 70 to 75 캜 to form a second mixture, , 15 to 23 wt% of carbon black SRF (Semi-reinforcing Fumace Balck), 7 to 12 wt% of calcium carbonate (cac03) and 14 to 22 wt% of a blend oil were added to the first mixture and the second mixture, respectively, A second blending step of mixing at a temperature of 80 to 85 캜, 1 to 2% by weight of zinc oxide (ZnO) and 0.5 to 1% by weight of stearic acid (S / T) are added to the first mixture and the second mixture, respectively, in the second mixing step, A cooling step of cooling the first mixture and the second mixture mixed in the third mixing step to a temperature of 20 to 30 캜, a cooling step of cooling the first mixture and the second mixture cooled in the cooling step to a thiazole- 0.2 to 0.4 wt% of M (MBT: 2-Mercapto benzo thiazole), 0.05 to 0.2 wt% of TT (TMTD: Tetramethylthiuram disulfide), 0.05 to 0.2 wt% of sulfur (S and 0.2 to 0.4% by weight of cerium, respectively, and then mixing the first mixture and the second mixture to form the first and second pads; 1 molding step, a drying step of drying the first pad and the second pad formed in the first forming step, and And a second shaping step of laminating gamyeo the first pad and the second pad drying group in the drying step alternately to each other in the vertical direction and pressed.

In the second forming step, the first pad and the second pad are positioned and pressurized on the inner side of the press mold composed of the upper plate and the lower plate, and the upper plate or the lower plate of the press mold is formed concave in the outward direction, Arranged grooves may be provided

The multiple anti-vibration pad according to one embodiment of the present invention has high tensile strength and elongation, and is excellent in absorbing shock and vibration when it is applied.

Also, since the elastic force and the restoring force are strong, the permanent compressive strain is low and the durability is excellent.

Also, the first pad and the second pad having different hardnesses may be laminated in multiple layers to limit the compression ratio due to the external load, and the flexibility and elasticity of the vibration pad can be secured.

In addition, it has excellent heat resistance and aging resistance, and has high durability and excellent shock and vibration damping effect regardless of external temperature.

1 is a perspective view illustrating a multiple anti-vibration pad according to an embodiment of the present invention.
2 is an exploded perspective view illustrating an anti-vibration pad according to an embodiment of the present invention.
3 is a perspective view illustrating a multiple anti-vibration pad according to another embodiment of the present invention.
4 is a flowchart illustrating a method of fabricating a multiple anti-vibration pad according to an embodiment of the present invention.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Embodiments in accordance with the concepts of the present invention can make various changes and have various forms, so that specific embodiments are illustrated in the drawings and described in detail in this specification or application. It should be understood, however, that the embodiments according to the concepts of the present invention are not intended to be limited to any particular mode of disclosure, but rather all variations, equivalents, and alternatives falling within the spirit and scope of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the "inclusive" or "gajida" and the terms are staking the features, numbers, steps, operations, elements, parts or geotyiji to be a combination thereof specify the presence, of one or more other features, integers , Steps, operations, components, parts, or combinations thereof, as a matter of principle.

Hereinafter, the present invention will be described in detail.

FIG. 1 is a perspective view illustrating a multiple anti-vibration pad according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view illustrating a multiple anti-vibration pad according to an embodiment of the present invention.

The multiple vibration damping pad according to an embodiment of the present invention may include a rubber material such as a natural rubber (NR) or an ethylene-propylene rubber (EP) 45 to 50% by weight, a liquid isoprene rubber (LIR) 4 to 6% by weight of CR (chloroprene rubber), 15 to 23% by weight of carbon black SRF (Semi reinforcing Fumace Balck), 7 to 12% by weight of calcium carbonate (cac03), 14 to 22% 2-mercapto benzo thiazole (M) in a thiazole-based accelerator, 0.2 to 0.4 wt% of a thiuram-based accelerator, and TT (TMTD: Tetramethylthiuram A first pad 100 formed from 0.05 to 0.2% by weight of disulfide, 0.05 to 0.2% by weight of sulfur and 0.2 to 0.4% by weight of cerium (CE) cerium; 50 to 55% by weight of a natural rubber (NR) or an ethylene-propylene rubber (EP), 2 to 4 by weight of a liquid isoprene rubber (LIR) or chloroprene rubber (CR) 15 to 23% by weight of carbon black SRF (Semi reinforcing Fumace Balck), 7 to 12% by weight of calcium carbonate (cac03), 14 to 22% by weight of compounded oil, 1 to 2% by weight of zinc oxide (ZnO) 0.2 to 0.4% by weight of M (MBT: 2-Mercapto benzo thiazole) as a thiazole accelerator, 0.05 to 0.2% by weight of TT (TMTD: Tetramethylthiuram disulfide) Wherein the first pad 100 and the second pad 200 are formed to include 0.05 to 0.2% by weight of sulfur and 0.2 to 0.4% by weight of cerium (CE) Are stacked in the vertical direction, and the first pad 100 is provided at the uppermost or lowermost end.

Natural rubber (NR: natural rubber) is firstly taken from a rubber tree and has excellent mechanical properties. It has excellent adhesiveness and good workability , While the double bond of the main chain has poor weatherability and heat resistance and is weak to mineral oil.

Ethylene Propylene Rubber is preferably an ethylene-propylene-diene-methylene rubber (EPDM) rubber. In general, EPDM rubber has a low degree of unsaturation in its molecular structure and is very resistant to oxygen and ozone. Refers to an amorphous rubber having a characteristic of exhibiting a low dielectric loss value as a nonpolar structure and having ethylene and propylene and a third component for vulcanization, Diene (D), irregularly bonded thereto, wherein M (Methylene) means that the polymer backbone is free of unsaturation. As described above, the EPDM rubber has good properties such as ozone resistance, heat resistance and weather resistance, and can be used in the range of 150 to 175 占 폚 depending on the compounding. Since the glass transition temperature reaches about 60 占 폚, It is also excellent. In addition, since the molecular structure is composed only of carbon-hydrogen and carbon-carbon bonds, there is no polar group, so the insulating property is excellent, and the relative dielectric constant is 2.4 when the additive is not included. However, it has a strong resistance to polar solvents such as acids, alkalis and water, but has a disadvantage in that it is easily swollen due to a similar solubility index to nonpolar solvents such as toluene, gasoline, mineral oil and insulating oil.

The first pad 100 of the present invention uses 45 to 50% by weight of at least one of the natural rubber (NR) or the ethylene-propylene rubber (EP). The selection or mixing of the natural rubber and the ethylene-propylene rubber may vary depending on the intended use of the vibration-proof pad.

The second pad 200 of the present invention uses 50 to 55% by weight of at least one of the natural rubber (NR) or the ethylene-propylene rubber (EP). The selection or mixing of the natural rubber and the ethylene-propylene rubber may vary depending on the intended use of the vibration-proof pad.

Since the specific gravity of the natural rubber (NR) or the ethylene-propylene rubber (EP) is different from that of the first pad (100) and the second pad (200) of the present invention, .

Liquid Isoprene Rubber (LIR) is a clear, odorless liquid state, and has properties as a reactive plasticizer and can be used for kneading rubber. When the liquid isoprene rubber is used as a plasticizer, not only the rubber is softened but also it can be crosslinked together with rubber at the time of molding. Conventional rubber plasticizers (mineral oils) have a disadvantage in that the rubber is soiled at the time of molding to deteriorate the physical properties. However, when liquid isoprene rubber is used, such disadvantages can be solved and it is mainly used for tires which require high performance.

Chloroprene rubber (CR: chloroprene rubber) is excellent in weather resistance, ozone resistance and heat aging resistance. It has good oil resistance, chemical resistance and flame retardancy. It has low gas permeability, strong adhesive force and high resistance to various external environments.

The first pad 100 of the present invention uses 4 to 6 wt% of at least one of liquid isoprene rubber (LIR) or chloroprene rubber (CR). The selection or mixing of the liquid isoprene rubber and chloroprene rubber may vary depending on the intended use of the vibration pad.

The second pad 200 of the present invention uses 2 to 4% by weight of at least one of liquid isoprene rubber (LIR) or chloroprene rubber (CR). The selection or mixing of the liquid isoprene rubber and chloroprene rubber may vary depending on the intended use of the vibration pad.

The first pad 100 and the second pad 200 of the present invention have different physical properties due to different specific gravity of liquid isoprene rubber (LIR) or chloroprene rubber (CR).

More specifically, the first pad 100 and the second pad 200 may have a specific gravity of natural rubber (NR) or an ethylene-propylene rubber (EP) and a liquid isoprene rubber LIR: Liquid Isoprene Rubber) or chloroprene rubber (CR: Chloroprene Rubber) have different hardnesses. In the embodiment of the present invention, the hardness of the first pad 100 is less than the hardness of the second pad 200. The hardness was measured by the Rockwell hardness measurement method during Indentation Hardness Test. The hardness of the first pad 100 has a hardness of 20 to 30 Hs and the hardness of the second pad 200 has a hardness of 30 to 40 Hs.

Carbon black can be used to control the physical properties of rubber and has a merit that the generation of bubbles during mixing can be reduced due to low heat generation. The carbon black SRF (Semi-reinforcing Fumace Balck) has a relatively large size of particles in carbon black, relatively low stiffness, and is suitable for wear-resistant or low-hardness products. Carbon black may be classified into channel black and furnace black. The carbon black SRF used in the present invention belongs to the furnace black. The size of the carbon black SRF is 20 to 90 탆, the PH is 5 To 9 (alkaline), those having little heat generation and no influence on the vulcanization rate can be used. More preferably, a carbon black SRF having a particle size of 70-90 占 퐉 is used.

Calcium carbonate is also called limestone, and there are heavy calcium carbonate, precipitated calcium carbonate and the like depending on the kind thereof, and activated calcium carbonate treated with a suitable organic material on the surface of the particle. In the present invention, among the heavy calcium carbonate or precipitated calcium carbonate, light calcium carbonate, extreme calcium carbonate, extreme-activity activated calcium carbonate, and the like can be used, but there is no particular limitation.

The compounded oil has good compatibility with natural rubber or synthetic rubber, good processability, and good dispersibility and good affinity as a lubricant as a compounding agent, so that a rapid softening effect is imparted to achieve rubber molding and uniform quality during extrusion operation. In addition, it is possible to improve physical strength such as tensile strength, elasticity, abrasion resistance and the like by increasing the moisture resistance and aging resistance of the rubber and imparting cohesion. Such blends may be paraffinic, naphthenic, aromatic or the like. In the present invention, any one of the above types may be used or a mixture of two or more of them may be used.

In addition to the above materials, talc, calcium sulfate, magnesium oxide, calcium stearate, wollastonite, mica, silica, calcium silicate, clay and the like may be used.

The first pad 100 and the second pad 200 may each contain 15 to 23% by weight of carbon black SRF (Semi-reinforcing Fumace Balck), 7 to 12% by weight of calcium carbonate (CaC03), 14 to 22% . The physical properties of the first pad 100 and the second pad 200 can be controlled by adjusting the proportions of the carbon black SRF, calcium carbonate, and compounded oil. Can vary.

The vulcanization accelerator may be selected from the group consisting of a thiazole type promoter, a guanijine type promoter, a thiuram type promoter, a thiourea type promoter, a thiocarbamate type promoter, At least one of an accelerator, a blend accelerator, a diisocyanate accelerator, and a natural vulcanization accelerator may be used.

In the present invention, as the vulcanization accelerator for shortening the vulcanization time of rubber, the first pad 100 and the second pad 200 may each contain 1 to 2% by weight of zinc oxide (ZnO), 0.5 to 5% by weight of stearic acid (S / T) 0.2 to 0.4% by weight of M (MBT: 2-Mercapto benzo thiazole) as a thiazole accelerator, 0.05 to 0.2% by weight of TT (TMTD: Tetramethylthiuram disulfide) as a thiuram promoter, 0.05 to 0.2% To 0.2% by weight of cerium and 0.2 to 0.4% by weight of cerium (CE: cerium).

Zinc oxide (ZnO) is used as a vulcanization accelerator for rubber, a filler, or a colorant. In the present invention, zinc oxide is used in an amount of 1 to 2% by weight as a vulcanization accelerator. The stearic acid (S / T) of the present invention is used for increasing the dispersibility of zinc oxide, and 0.5 to 1 wt% is used to accelerate the initial vulcanization.

M (MBT: 2-Mercapto benzo thiazole) among the thiazole-based accelerators has a higher vulcanization accelerating power than aldehyde amines and guanidines and is suitable for blending with the above-mentioned furnace black (Fumace Balck).

Among the thiuram-based accelerators, TT (TMTD: Tetramethylthiuram disulfide) can obtain a vulcanized product excellent in heat resistance and aging resistance and can be vulcanized at about 120 ° C.

In the present invention, the combination of M (MBT: 2-Mercapto benzo thiazole) among the thiazole accelerators and TT (TMTD: Tetramethylthiuram disulfide) among the thiuram promoters is suitable for blending with carbon black SRF and has heat resistance and aging resistance It is possible to form the first pad 100 and the second pad 200 having excellent effects.

The sulfur is used as a vulcanizing agent, and the cerium is used as a catalyst.

Magnesium oxide may further be added to the first pad 100 and the second pad 200. In this case, the added magnesium oxide is preferably 1 to 2% by weight. If magnesium oxide is added, the specific surface area or activity of the rubber may be increased and the vulcanization rate may be delayed accordingly. When the vulcanization rate is delayed, the processing stability is improved and the vulcanization state is excellent.

The first pad 100 and the second pad 200 of the present invention containing the above-mentioned vulcanizing agent are excellent in heat resistance, and the change of elasticity with the temperature change is reduced. Therefore, when installed on the floor of a building, It is possible to absorb stable shocks and vibrations, and the tensile strength is increased, so that the elasticity is strengthened, so that the permanent compression toughness according to the load is reduced.

Table 1 shows the physical property test results of the first pad 100 and the second pad 200 of the present invention.

Table 1. Test results of physical properties of first pad and second pad. Test Items unit Results (first pad) Results (second pad) Test Methods The tensile strength Mpa 11 10.5 KS M 6518: 2006 Elongation % 9.4 9.6 KS M 6518: 2006 Hardness (Hs) 25 35 KS M 6518: 2006 Phosphorus strength kN / m 24.1 24.6 KS M 6518: 2006 (Type B) Aging test ((70 ㅁ 1) ℃, 96h) Tensile strength change rate % -6.7 -6.5 KS M 6518: 2006 Aging test ((70 ㅁ 1) ℃, 96h) elongation change rate % -1.2 -0.8 KS M 6518: 2006 Aging test ((70 ° C 1) ° C, 96h) Tear strength kN / m 20.3 20.8 KS M 6518: 2006 (Type B) Immersion test ((23 ㅁ 2) ℃, 90h tap water) Weight change rate % 0.7 0.5 KS M 6518: 2006 Immersion test ((23 ㅁ 2) ℃, 90h Tap water) Tensile strength change rate % -2.3 -2.1 KS M 6518: 2006 Immersion test ((23 ㅁ 2) ℃, 90h tap water) Elongation change rate % -0.2 -0.2 KS M 6518: 2006 Compression Permanent Row Tone ((70 ° C 1) ° C, 22h) % 18 24 KS M 6518: 2006

Table 2 shows the results of testing the physical properties of a conventional vibration damping pad having a hardness of 60.

Table 2. Results of physical property test of conventional anti-vibration pad. Test Items unit Results Test Methods The tensile strength Mpa 8.9 KS M 6518: 2006 Elongation % 4.9 KS M 6518: 2006 Hardness (Hs) 62 KS M 6518: 2006 Phosphorus strength kN / m 30.3 KS M 6518: 2006 (Type B) Aging test ((70 ㅁ 1) ℃, 96h) Tensile strength change rate % 0.04 KS M 6518: 2006 Aging test ((70 ㅁ 1) ℃, 96h) elongation change rate % -5.8 KS M 6518: 2006 Aging test ((70 ° C 1) ° C, 96h) Tear strength kN / m 29.3 KS M 6518: 2006 (Type B) Immersion test ((23 ㅁ 2) ℃, 90h tap water) Weight change rate % 0.7 KS M 6518: 2006 Immersion test ((23 ㅁ 2) ℃, 90h Tap water) Tensile strength change rate % -1.5 KS M 6518: 2006 Immersion test ((23 ㅁ 2) ℃, 90h tap water) Elongation change rate % 0.4 KS M 6518: 2006 Compression Permanent Row Tone ((70 ° C 1) ° C, 22h) % 34 KS M 6518: 2006

[Table 2]

As shown in Table 1 and Table 2, the first pad 100 and the second pad 200 according to the present invention are characterized in that their hardness is lower than that of the conventional anti-vibration pad. Comparing Table 1 and Table 2, the first pad 100 and the second pad 200 according to the present invention have a high tensile strength and elongation, and in the aging test and the immersion test, the tensile strength change ratio and the elongation percentage change rate are relatively higher low.

That is, since the first pad 100 and the second pad 200 of the present invention have a hardness lower than that of the conventional anti-vibration pad and have high tensile strength and elongation due to high resilience, they are placed on the floor, The time required for restoration after being compressed by external impact or vibration is shortened. As a result, the compression durability is lowered. Also, as shown in the results of the aging test and the immersion test, the rate of change due to aging and deterioration is small, so that it can be installed in various environments, and is capable of maintaining a stable damping effect without being greatly affected by the season.

As shown in FIGS. 1 and 2, the first pad 100 and the second pad 200 formed in the present invention may be formed to have a thickness of 10 mm to 20 mm, The first pad 100 and the second pad 200 having a thickness are stacked in the vertical direction. The first pad 100 and the second pad 200 may be pressed in a laminated state. The first pad 100 and the second pad 200 are respectively a plurality of the first pad 100 and the second pad 200. The second pad 200 is located below the first pad 100, And the first pad 100 is positioned. The anti-vibration pad stacked as described above has a structure composed of a plurality of layers. As the first pad 100 and the second pad 200 having different hardnesses are repeatedly laminated, the external shock or vibration is absorbed step by step and the compressibility according to the external load is limited. The hardness of the first pad 100 may be lower than the hardness of the second pad 200 so that the first pad 100 and the second pad 200 are repeatedly stacked, The first pad 100 absorbs the fine vibration and the micro impulse and the second pad 100 absorbs the large vibration and shock simultaneously. In addition, since the second pad 200 having a relatively large hardness can provide a supporting force against an external load, the compressibility is limited, so that structural stability can be secured.

For this, the first pad 100 may be provided at the uppermost or lowermost end of the vibration-proof pad. The first pad 100 provided at the uppermost or lowermost end of the vibration damping pad first attenuates an external impact or vibration and the second pad 200 provided inside the vibration damping pad absorbs It has a structure for attenuating secondary shocks or vibrations that have not been attained.

The vibration damping pad having the plurality of layers preferably has a thickness of 20 to 25 mm, more preferably 25 mm.

The outer surface of the first pad 100 provided at the uppermost or lowermost end may be provided with protrusions 110 which are convex outwardly and arranged in a grid pattern. The protrusions 110 may be formed by pressing the first pad 100 and the second pad 200 while deforming the shape of the press or the like in the process of forming the first pad 100 and the second pad 200. The protrusion 110 is provided at the uppermost or lowermost end of the vibration pad composed of a plurality of layers so that when the first pad 100 attenuates an external impact or vibration, the protrusion 110 is first elastically deformed, It absorbs minute impact and minimizes the contact area with the outside, so that the dustproof effect is excellent and the durability of the dustproof pad is improved. The protrusions 110 may be provided at the uppermost and lowermost ends of the vibration-proof pads. In addition, the protrusions 110 are preferably arranged repeatedly in a lattice shape, but the present invention is not limited thereto.

In one embodiment of the present invention, the load supporting member 120 is inserted into the first pad 100 and is in contact with the second pad 200 stacked adjacent to the upper or lower end, can do. The load-bearing member 120 prevents excessive compressive deformation of the first pad 100 having a relatively low hardness.

The load supporting member 120 may have a cylindrical shape and may have a structure in which an elastic body such as a spring is received therein. The upper or lower end of the load supporting member 120 may be inserted into the first pad 100 and may be in contact with the second pad 200 stacked adjacent to the upper side or the lower side of the first pad 100 have.

The load supporting member 120 of the present invention having the above structure absorbs external impacts and vibrations while supporting the load of the first pad 100, thereby reducing the compression ratio and reducing the permanent compression toughness It is effective.

3 is a perspective view illustrating a multiple anti-vibration pad according to another embodiment of the present invention.

Referring to FIG. 3, in another embodiment of the present invention, the first pad 100 and the second pad 200 are alternately repeatedly arranged to form one composite sheet, The first pad 100 of the composite sheet located at the upper portion and the second pad 200 of the composite sheet located at the lower portion located in the upper portion can be stacked while being in contact with each other.

The first pad 100 and the second pad 200 constitute one composite sheet, and the composite sheet is formed in a stripe shape so that the first pad 100 and the second pad 200 are arranged in a striped pattern, Are repeatedly arranged alternately. The number of the first pads 100 and the second pads 200 arranged alternately may vary. A plurality of the composite sheets, in which the first pad 100 and the second pad 200 are repeatedly arranged in stripes, are stacked while being vertically contacted. In this case, the first pad 100 of the uppermost composite sheet and the second pad 200 of the composite sheet located at the lower portion adjacent to the first pad 100 are in contact with each other, and the second pad 200 of the uppermost composite sheet, So that the first pads 100 of the composite sheet located at the lower part are in contact with each other. Since the vibration damping pads arranged and stacked in the above manner have the effect of attenuating impact and vibration in a complex manner and the first pad 100 and the second pad 200 are repeatedly arranged in one composite sheet, Two pads 200 may serve as the load supporting member 120. [

4 is a flowchart illustrating a method of fabricating a multiple anti-vibration pad according to an embodiment of the present invention.

4, a method for manufacturing a multiple anti-vibration pad according to an embodiment of the present invention includes 45 to 50% by weight of a natural rubber (NR) or an ethylene-propylene rubber (EP) and a liquid isoprene rubber 4 to 6% by weight of a liquid isoprene rubber (LIR) or chloroprene rubber (CR) is mixed at a temperature of 70 to 75 ° C to form a first mixture, and a natural rubber (NR) 50 to 55% by weight of EP (Ethylene Propylene Rubber) and 2 to 4% by weight of liquid isoprene rubber (LIR) or chloroprene rubber (CR) at 70 to 75 ° C to form a second mixture (S100); 15 to 23 wt% of carbon black SRF (Semi-reinforcing Fumace Balck), 7 to 12 wt% of calcium carbonate (cac03) and 14 to 12 wt% of calcium carbonate (cac03) are mixed in the first mixture and the second mixture, respectively, A second mixing step (S200) of adding 22 wt% and mixing at a temperature of 80 to 85 DEG C; 1 to 2% by weight of zinc oxide (ZnO) and 0.5 to 1% by weight of stearic acid (S / T) are added to each of the first mixture and the second mixture in the second mixing step (S200) A third compounding step (S300) of mixing at a temperature; A cooling step (S400) of cooling the mixed first mixture and the second mixture to a temperature of 20 to 30 DEG C in the third mixing step (S300); 0.2 to 0.4% by weight of M (MBT: 2-Mercapto benzo thiazole) in the thiazole-based accelerator, TT (TMTD: Tetramethylthiuram disulfide) 0.05% in the thiuram series accelerator is added to the first mixture and the second mixture cooled in the cooling step (S400) (S500) of adding 0.2 weight%, sulfur 0.05-0.2 weight% and cerium cerium 0.2-0.4 weight%, respectively, and then mixing them; A first forming step (S600) of forming the first pad (100) and the second pad (200) by pressurizing the first mixture and the second mixture, respectively, mixed in the fourth mixing step (S500); A drying step (S700) of drying the first pad (100) and the second pad (200) formed in the first forming step (S600); And a second forming step S800 for alternately stacking and pressing the first pad 100 and the second pad 200 dried in the drying step S700 in the vertical direction.

The first blending step S100 is a step of forming a first mixture and a second mixture, respectively. In the first blender, natural rubber (NR) or ethylene-propylene rubber (EP) Ethylene Propylene Rubber) and 4 to 6% by weight of liquid isoprene rubber (LIR) or chloroprene rubber (CR) are mixed and mixed at 70 to 75 ° C for about 10 minutes. In order to form the second mixture, 50 to 55% by weight of a natural rubber (NR) or an ethylene-propylene rubber (EP) and a liquid isoprene rubber (LIR) or a chloroprene rubber (CR: chloroprene rubber) at a temperature of 70 to 75 ° C for about 10 minutes.

The second mixing step (S200) may include adding 15 to 23% by weight of carbon black SRF (Semi-reinforcing Fumace Balck) to the first blender and the second blender to adjust the physical properties of the first mixture and the second mixture, ) 7 to 12% by weight and compounding oil 14 to 22% by weight, followed by mixing at 80 to 85 ° C for about 10 minutes. In the second mixing step (S200), talc, calcium sulfate, magnesium oxide, calcium stearate, wollastonite, mica, silica, calcium silicate, clay and the like may be further added.

Through the second mixing step (S200), the first mixture and the second mixture are reinforced with heat resistance and rigidity.

The third mixing step (S300) is a step of adding a vulcanization accelerator to the first mixture and the second mixture, and mixing the mixture with a vulcanization accelerator, wherein 1 to 2% by weight of zinc oxide (ZnO) is added to each of the first blender and the second blender, 0.5 to 1% by weight of stearic acid (S / T) is added, followed by mixing at 85 to 90 DEG C for about 5 minutes.

In the third compounding step S300, magnesium oxide (MgO) may be added. The effect of adding magnesium oxide is as described above. Further, in the third mixing step (S300), a foam preventing agent and / or an antioxidant may be further added to prevent foaming during mixing. As the antifoaming agent, any one of the above-mentioned vulcanization accelerators may be used. As the antioxidant, any one of amine and phenol may be used.

In the third mixing step (S300), the above-mentioned vulcanization accelerator is preferably added and then mixed at a constant temperature, whereby the first mixture and the second mixture undergo primary vulcanization.

The first blending step (S100), the second blending step (S200), and the third blending step (S300) proceed sequentially, and the temperature may gradually increase. Accordingly, it is possible to prevent solidification of components injected into the first blender and the second blender and to minimize the generation of bubbles during mixing, so that the components can be melted smoothly. The first blender and the second blender may be equipped with temperature sensors to confirm the temperatures of the first blending step (S100), the second blending step (S200) and the third blending step (S300) A heating means or a temperature holding means for gradually increasing the internal temperature of the blender and the second blender may be further combined. The heating means or the temperature holding means may be a heater for directly heating the first blender and the second blender, or may be a vapor supplier for indirect heating.

The cooling step (S400) of the present invention is a step of cooling the first mixture and the second mixture mixed in the third expansion step to a temperature of 20 to 30 캜. The cooling step (S400) may be performed at room temperature, or may be performed in a short time through a separate cooler or the like. In order to shorten the cooling time of the cooling step (S400), the first mixture or the second mixture may be cooled while being stirred.

The fourth mixing step S500 is a step of introducing a vulcanizing agent into the first blending machine and the second blender, wherein 0.2 to 0.4% by weight of M (MBT: 2-Mercapto benzo thiazole) in the thiazole- 0.05 to 0.2% by weight of TT (TMTD: Tetramethylthiuram disulfide), 0.05 to 0.2% by weight of sulfur and 0.2 to 0.4% by weight of cerium (CE: cerium) among the wax-based accelerators are added to the first and second blenders Add and mix.

The first forming step (S600) of the present invention refers to a step of molding the first mixture and the second mixture to which the vulcanizing agent is added in the fourth blending step (S500) into a plate shape. To this end, the first mixture and the second mixture may be pressurized using a roller or the like, respectively. The first mixture formed in the first forming step S600 is formed into a first pad 100 having a plate shape formed to a thickness of 10 to 20 mm and the second mixture is formed into a plate shape having a thickness of 10 to 20 mm The second pad 200 is formed. The pressurization through the roller or the like can be performed manually or through an automated facility, and more preferably, automated equipment combining a sensor or the like is used for a constant thickness. The first pad 100 and the second pad 200 may be formed to have a total thickness of 20 to 25 mm in a stacked state.

The drying step S700 is a step of drying the first pad 100 and the second pad 200 formed in the first forming step S600 and the first pad 100 and the second pad 200, Are placed horizontally so that they do not overlap with each other, and then dried naturally or through a cooler or the like.

The second forming step S800 is a step of stacking a plurality of the first pad 100 and the second pad 200 dried in the drying step S700 and pressing them with a press or the like. The first pad 100 and the second pad 200 are formed such that the second pad 200 is positioned below the first pad 100 and the first pad 100 is disposed below the second pad 200. [ 100) are located and have a structure composed of a plurality of layers. The first pad 100 and the second pad 200 stacked as described above are positioned inside the pressing frame including the upper plate and the lower plate and can be pressed by applying a load to the upper plate and / or the lower plate of the pressing frame. Accordingly, the first pad 100 and the second pad 200 are integrally formed while being bonded to each other to form a vibration pad.

The vibration pad formed by pressing the first pad 100 and the second pad 200 in the second forming step S800 may be formed to have a thickness of 20 to 25 mm.

In the second forming step S800, the first pad 100 and the second pad 200 are positioned and pressurized on the inner side of the pressing frame composed of the upper plate and the lower plate, The upper plate or the lower plate may be provided with recesses which are concavely formed in the outward direction and are repeatedly arranged in a lattice pattern.

As the grooves are formed in the upper plate or the lower plate, a plurality of protrusions 110 are formed on the uppermost or lowermost surface of the vibration pad formed in the pressing mold. As compared with the case where the projection 110 is not provided, the vibration-proof pad of the present invention, which is formed as described above, has an effect of improving the soundproof effect and excellent in restoring force.

As described above, according to the method of fabricating a multiple anti-vibration pad and an anti-vibration pad according to the present invention, the elasticity and the restoring force are excellent, and the first pad 100 and the second pad 200 are repeatedly laminated, It has the advantage of being excellent.

100: first pad 110: projection
120: load supporting member
200: second pad
S100: First blending step S200: Second blending step
S300: Third mixing step S400: Cooling step
S500: Fourth mixing step S600: First forming step
S700: drying step S800: second molding step

Claims (7)

delete delete delete delete 45 to 50% by weight of a natural rubber (NR) or an ethylene-propylene rubber (EP) and 4 to 6% by weight of a liquid isoprene rubber (LIR) or a chloroprene rubber (CR) Are mixed at a temperature of 70 to 75 캜 to form a first mixture and 50 to 55% by weight of a natural rubber (NR) or an ethylene-propylene rubber (EP) and a liquid isoprene rubber (LIR) Rubber or chloroprene rubber (CR: 2 to 4% by weight) at a temperature of 70 to 75 ° C to form a second mixture;
15 to 23% by weight of carbon black SRF (Semi-reinforcing Fumace Balck), 7 to 12% by weight of calcium carbonate (cac03) and 14 to 22% by weight of compounding oil are added to each of the first mixture and the second mixture, Followed by mixing at a temperature of 80 to 85 캜;
1 to 2% by weight of zinc oxide (ZnO) and 0.5 to 1% by weight of stearic acid (S / T) are added to each of the first mixture and the second mixture mixed in the second mixing step, A third mixing step;
A cooling step of cooling the first mixture and the second mixture mixed in the third mixing step to a temperature of 20 to 30 캜;
0.2 to 0.4% by weight of M (MBT: 2-Mercapto benzo thiazole) in the thiazole accelerator and 0.05 to 0.2% by weight of TT (TMTD: Tetramethylthiuram disulfide) among the thiuram-based accelerator are added to the first mixture and the second mixture cooled in the cooling step 0.05 to 0.2% by weight of sulfur (S) and 0.2 to 0.4% by weight of cerium (CE), respectively, and then mixing the mixture;
A first forming step of forming the first pad and the second pad by pressurizing the first mixture and the second mixture mixed in the fourth mixing step, respectively;
A drying step of drying the first pad and the second pad formed in the first forming step; And
And a second shaping step of alternately stacking and pressing the first and second pads dried in the drying step in a vertical direction.
6. The method of claim 5,
Wherein the second forming step comprises:
The first pad and the second pad are positioned and pressurized on the inside of the presser frame composed of the upper plate and the lower plate and the upper plate or the lower plate of the presser plate is recessed outwardly and arranged in a lattice- Wherein the method comprises the steps of: A multiple anti-vibration pad produced by the method of claim 5 or 6.

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