Rubber reinforcing material with reduced weight, process for its preparation and tyre comprising the same

Abstract

The present invention relates to a rubber reinforcing material having reduced weight, a method for producing the rubber reinforcing material, and a tire including the rubber reinforcing material. According to the present invention, a rubber reinforcing material having a thin thickness and light weight and still having excellent durability is provided. The reinforcing material not only reduces the weight of the tire, but also enables improved rolling resistance.

Description

Technical Field

[0001] The present invention relates to a weight-reducing rubber reinforcement material capable of reducing tire weight, a method for preparing the rubber reinforcement material, and a tire comprising such a rubber reinforcement material. Background Technology

[0002] With improvements in vehicle performance and road conditions, tires are required to maintain stability and durability during high-speed driving. Furthermore, considering environmental, energy, and fuel efficiency concerns, a tire that is lighter while still possessing excellent durability is needed. As a solution to meet these requirements, research is actively underway on tire cords, the rubber reinforcing materials used in tires.

[0003] Tire cords can be categorized based on their location and function. For example, tire cords can be primarily divided into the tire carcass, which typically supports the tire; the belt layer, which bears the load and prevents deformation at high speeds; and the crown belt layer, which prevents deformation of the belt layer (see [link to product description]). Figure 1 ).

[0004] Examples of materials used for tire cords include nylon, rayon, aramid, and polyester.

[0005] Typically, tire cords are rolled together with the rubber component to bond with the rubber. That is, a rolling process is included in tire manufacturing. However, applying a rolling process to bond the tire cords and rubber during tire manufacturing can increase process costs, and the tire density may increase beyond necessary levels due to rolling, thus unnecessarily increasing the tire's weight.

[0006] Solid rubber is generally used in the process of rolling rubber into tire cords. However, it is difficult to prepare the product formed by rolling solid rubber into a film with a thickness of less than 200 μm, specifically 5 μm to 30 μm, and the thickness and weight of the tire may increase when such a product is used as a rubber reinforcement material.

[0007] Recently, tire manufacturers have been trying to reduce the thickness of the rubber layer in order to achieve ultra-lightweight tires and lighter reinforcing materials. Rolling resistance (R / R) is related to the weight of the tire and has a significant impact on vehicle fuel consumption and carbon dioxide emissions. For example, as rolling resistance (R / R) increases, the energy required during vehicle operation also increases. Furthermore, the resistance to vehicle rotation, tilting, and acceleration is related to the vehicle's weight. Therefore, research is underway on reducing vehicle weight by reducing tire weight, thereby reducing energy consumption. Summary of the Invention

[0008] [Technical Issues]

[0009] One object of the present invention is to provide a rubber-reinforced material having a thin thickness while still having excellent durability.

[0010] Another object of the present invention is to provide a method for preparing a rubber-reinforced material having a thin thickness while still exhibiting excellent durability.

[0011] Another object of the present invention is to provide a tire comprising the rubber reinforcing material.

[0012] [Technical Solution]

[0013] According to one embodiment of the present invention, a rubber reinforcing material is provided, comprising:

[0014] Fiber substrate;

[0015] An adhesive layer located on the fiber substrate; and

[0016] The rubber compound layer located on the adhesive layer,

[0017] The thickness of the rubber composite layer is 2 μm to 200 μm, the t50 value is 150 seconds to 220 seconds, and the t90 value is 300 seconds to 350 seconds.

[0018] In this paper, the t50 value is the time (in seconds) required to reach 50% of the maximum crosslinking density of the rubber composite layer, measured by a rheometer according to the ASTM D2084 standard test method, and the t90 value is the time (in seconds) required to reach 90% of the maximum crosslinking density.

[0019] According to another embodiment of the present invention, a method for preparing the rubber reinforcing material is provided, comprising the following steps:

[0020] Preparation of fiber substrate,

[0021] An adhesive layer is formed on the fiber substrate; and

[0022] A rubber compound solution is applied to the adhesive layer and then heat-treated to form a rubber compound layer on the adhesive layer.

[0023] The rubber compound solution is prepared by adding one component contained in the rubber compound solution at 50°C to 110°C and 30 rpm to 50 rpm, and simultaneously mixing other components sequentially for 30 to 120 seconds while stirring.

[0024] According to another embodiment of the present invention, a tire comprising the said rubber reinforcing material is provided.

[0025] The following will describe in detail the rubber reinforcement material according to embodiments of the present invention, the method for preparing the rubber reinforcement material, and the tire including the rubber reinforcement material.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of effectively illustrating particular embodiments only and is not intended to limit the invention.

[0027] A singular expression includes its plural expression unless explicitly stated or clearly not intended to be so by the context.

[0028] As used herein, the term “comprising” is intended to indicate the presence of the features, number, steps, structural elements, or combinations thereof practiced, and is not intended to exclude the possibility of the presence or addition of one or more other features, number, steps, structural elements, or combinations thereof.

[0029] While various modifications and forms can be made to this invention, specific examples will be described and explained in detail below. However, it should be understood that this is not intended to limit the invention to the specific disclosure, and that the invention includes all its modifications, equivalents, or substitutions without departing from its spirit and scope.

[0030] Furthermore, when the positional relationship between two components is described using terms such as "above," "over," "below," "below," and "beside," other components may be located between these two components unless the terms "exactly" or "directly" are used.

[0031] Furthermore, when the chronological order is described using terms such as "after," "following," "next," and "before," it may include discontinuous cases unless the expressions "exactly" or "directly" are used.

[0032] Furthermore, the term "at least one" should be understood to include all combinations presented from one or more related items.

[0033] Furthermore, terms including ordinal numbers such as "first" and "second" are used only to distinguish one structural element from other structural elements. For example, a first structural element may be referred to as a second structural element, and similarly, a second structural element may be referred to as a first structural element, without departing from the scope of the invention.

[0034] I. Rubber Reinforcing Materials

[0035] According to one embodiment of the present invention, a rubber reinforcing material is provided, comprising:

[0036] Fiber substrate;

[0037] An adhesive layer located on the fiber substrate; and

[0038] The rubber compound layer located on the adhesive layer,

[0039] The thickness of the rubber composite layer is 2 μm to 200 μm, the t50 value is 150 seconds to 220 seconds, and the t90 value is 300 seconds to 350 seconds.

[0040] (Where t50 is the time (in seconds) required to reach 50% of the maximum crosslinking density of the rubber composite layer, measured by a rheometer according to the ASTM D2084 standard test method, and t90 is the time (in seconds) required to reach 90% of the maximum crosslinking density).

[0041] As a result of the inventors’ continued research, it has been confirmed that rubber-reinforced materials comprising rubber composite layers with the above-mentioned properties have a thin thickness and still exhibit excellent durability.

[0042] Because the rubber reinforcing material of the above embodiment includes the rubber composite layer and exhibits uniform properties while still possessing excellent adhesion strength to rubber, it can be firmly bonded to rubber without the need for a rolling process during tire manufacturing. Therefore, the rubber reinforcing agent can reduce tire manufacturing costs and prevent unnecessary increases in tire density and weight due to rolling.

[0043] Furthermore, since the rubber reinforcement material has excellent adhesion strength to rubber, air pockets can be reduced during the manufacture of green tires, thereby reducing the tire defect rate.

[0044] Because of its thin thickness, the rubber reinforcement material meets the requirement of reducing the thickness of the rubber layer for ultra-light tires. Furthermore, the rubber reinforcement material can reduce rolling resistance and improve fuel efficiency in automobiles. Specifically, the rubber reinforcement material can improve the fuel efficiency and driving performance of electric vehicles.

[0045] Figure 2 and Figure 4 These are schematic cross-sectional views of rubber-reinforced materials (201, 301) according to an embodiment of the present invention.

[0046] The rubber reinforcement material (201, 301) includes a fiber substrate (210, 110), an adhesive layer (220) on the fiber substrate (210, 110), and a rubber composite layer (230) on the adhesive layer (220).

[0047] According to an embodiment of the invention, the fiber substrate may include at least one of, for example, a plied yarn (110) and a fabric substrate (210) woven with warp and weft yarns.

[0048] The fiber yarn can be a ply yarn (110) formed by re-twisting one or more untwisted yarns (111, 112). The untwisted yarn may include one or more materials selected from nylon, rayon, aramid, polyester and cotton.

[0049] The ply yarn includes a mixed ply yarn formed by re-twisting initial-twist yarns of different materials. For example, a mixed ply yarn may include initial-twist nylon yarn and initial-twist aramid yarn.

[0050] Reference Figure 3 The ply yarn (110) comprises a first-twist yarn 1 (111) and a second-twist yarn 2 (112), wherein the first-twist yarn 1 (111) and the first-twist yarn 2 (112) are re-twisted together. The first-twist yarn 1 (111) has a first twist direction, the first-twist yarn 2 (112) has a second twist direction, and the first-twist yarn 1 (111) and the first-twist yarn 2 (112) are re-twisted together in a third twist direction. In this document, the second twist direction may be the same as the first twist direction, and the third twist direction may be opposite to the first twist direction. However, the twist direction is not limited to this. The first twist number and the second twist number may be the same as or different from each other. The first-twist yarn 1 (111) and the first-twist yarn 2 (112) may each have a twist number of, for example, from 150 TPM (twist per meter) to 500 TPM.

[0051] In the fabric base (210), the warp and weft yarns may each comprise one or more materials selected from nylon, rayon, aramid, polyester, and cotton.

[0052] Preferably, the warp yarns may comprise one or more materials selected from nylon, rayon, aramid, and polyester. And preferably, the weft yarns may comprise one or more materials selected from nylon, rayon, aramid, polyester, and cotton.

[0053] Meanwhile, the rubber reinforcing material (201, 301) includes an adhesive layer (220) located on the fiber substrate (210, 110).

[0054] The adhesive layer comprises resorcinol-formaldehyde-latex (RFL).

[0055] For example, the adhesive layer (220) can be formed from an adhesive coating solution containing resorcinol-formaldehyde-latex (RFL) and a solvent.

[0056] Resorcinol-formaldehyde-latex acts as an adhesive component. Specifically, resorcinol-formaldehyde-latex improves the affinity and adhesive strength between the fiber substrate (210, 110) and the rubber component. Consequently, the adhesive layer (220) improves the internal adhesive strength between the fiber substrate (210, 110) and the rubber composite layer (230), and also improves the external adhesive strength between the rubber reinforcement (201, 301) and the rubber (e.g., tread).

[0057] Thus, the fiber substrate (210, 110) and the rubber composite layer (230) can adhere stably to each other without separating, thereby reducing the defect rate in the manufacturing process of the tire (101).

[0058] Meanwhile, the rubber reinforcing material (201, 301) includes a rubber composite layer (230) located on the adhesive layer (220).

[0059] The rubber composite layer (230) may contain one or more elastic polymers selected from natural rubber and synthetic rubber.

[0060] The rubber compound layer (230) can be formed by coating a liquid rubber compound solution containing the elastic polymer onto the adhesive layer (220). Thus, the rubber reinforcement (201, 301) can have a thin rubber compound layer (230), a thickness that is difficult to achieve using a rolling process with solid rubber. Due to the reduced thickness of the rubber compound layer (230), it is possible to reduce the weight of both the rubber reinforcement (201, 301) including the rubber compound layer (230) and the tire including the rubber reinforcement (201, 301).

[0061] The rubber compound layer (230) may be formed from a rubber compound solution comprising an elastic polymer, sulfur, a vulcanization accelerator and a vulcanization retarder.

[0062] The elastic polymer can be one or more rubbers selected from natural rubber and synthetic rubber. For example, the elastic polymer can be one or more rubbers selected from natural rubber (NR), styrene-butadiene rubber (SBR), butadiene rubber (BR), chloroprene rubber (CR), isobutylene rubber (IBR), isoprene rubber (IR), nitrile rubber (NBR), butyl rubber, and chloroprene rubber.

[0063] The rubber compound solution may further contain one or more additives selected from the group consisting of adhesive solvents, carbon black, processing oils, activators, anti-aging agents, petroleum resins, and antioxidants.

[0064] The rubber compound solution may contain at least one solvent selected from toluene, naphtha, methanol, xylene, and tetrahydrofuran.

[0065] The thickness (t1) of the rubber composite layer (230) can be 2μm to 200μm, or 5μm to 150μm, or 5μm to 100μm, or 5μm to 50μm, or 10μm to 40μm, or 20μm to 40μm.

[0066] like Figure 2 As shown, the thickness (t1) of the rubber compound layer (230) is measured as the longest distance from one side of the rubber compound layer (230) adjacent to the adhesive layer (220) to the other side of the rubber compound layer (230) located on the opposite side of the adhesive layer (220).

[0067] In existing rubber-reinforced materials, a rubber substrate is rolled onto a fiber substrate to form a rubber layer. Therefore, the thickness of the rubber layer is generally 1 mm or more, or at least 0.8 mm or more.

[0068] Conversely, since the rubber composite layer (230) is formed from a rubber composite solution, it can have a thin thickness of less than 200 μm. Therefore, the overall thickness of the rubber reinforcement materials (201, 301) is reduced, and the thickness of the tire (101) including the rubber reinforcement materials (201, 301) can also be reduced.

[0069] If the thickness of the rubber compound layer (230) is too thin, the rubber compound layer (230) may not have sufficient pressure-sensitive adhesion and adhesive strength. Therefore, the defect rate may increase during tire manufacturing, and the tire's durability may deteriorate. Therefore, it is preferable that the thickness (t1) of the rubber compound layer (230) is 2 μm or more, or 5 μm or more, or 10 μm or more, or 20 μm or more.

[0070] However, if the rubber composite layer (230) is too thick, it may not be suitable for the purpose of providing a thin rubber reinforcement material (201, 301) according to the present invention. Specifically, if the rubber composite layer (230) is too thick, bubbles may form in the rubber composite layer (230) during solvent evaporation, making it difficult for the rubber reinforcement material (201, 301) to have a uniform thickness. Furthermore, cavitation may occur in tires using the rubber reinforcement material (201, 301), thus deteriorating tire quality and increasing the defect rate. In addition, the coating operation should be performed several times to form a thick rubber composite layer (230), thus degrading process efficiency. Therefore, it is preferable that the thickness (t1) of the rubber composite layer (230) is 200 μm or less, or 150 μm or less, or 100 μm or less, or 50 μm or less, or 40 μm or less.

[0071] Specifically, the rubber composite layer (230) may have a t50 value of 150 to 220 seconds and a t90 value of 300 to 350 seconds.

[0072] In this paper, the t50 value is the time (in seconds) required to reach 50% of the maximum crosslinking density of the rubber composite layer, measured by a rheometer according to the ASTM D2084 standard test method, and the t90 value is the time (in seconds) required to reach 90% of the maximum crosslinking density. The t90 value indicates the optimal vulcanization time, and the t50 value indicates the time required for half of the vulcanization to occur.

[0073] Vulcanization properties, such as t50 and t90 values, can be measured using any method commonly used in the art. For example, these vulcanization properties can be measured using a rheometer (the so-called "vulcanizer"). These vulcanization properties can be measured with reference to the literature Matador Rubber sro (2007) Test Methods of Rubber Materials and Products. VERT, pp. 71-76.

[0074] According to an embodiment of the invention, in order for the rubber compound layer (230) to form at a suitable vulcanization rate to uniformly exhibit the properties targeted in the invention (specifically, excellent adhesive properties), a t90 value of 300 seconds or more and a t50 value of 150 seconds or more are preferred. If the t90 and t50 values ​​are too small, the vulcanization initiation time of the rubber may be too fast, and therefore, the adhesive strength may be reduced due to premature vulcanization.

[0075] However, if the optimal vulcanization time for forming the rubber compound layer (230) is excessively extended, non-vulcanization may occur. Therefore, a t90 value of 350 seconds or less and a t50 value of 220 seconds or less are preferred.

[0076] Preferably, the t90 value of the rubber composite layer (230) can be 300 to 350 seconds, or 305 to 345 seconds, or 305 to 340 seconds, or 310 to 340 seconds. Additionally, the t50 value of the rubber composite layer (230) can be 150 to 220 seconds, or 160 to 220 seconds, or 170 to 210 seconds, or 180 to 210 seconds.

[0077] Meanwhile, according to the static electricity standard of fire safety standard (KFS 440), automobile tires are required to have a static electricity content of less than 1.0 × 10⁻⁶. 9 The inherent surface resistance of ohm / sq is used to prevent electrostatic safety accidents in automobiles.

[0078] According to an embodiment of the present invention, the rubber composite layer (230) may have a size of 4.0 × 10⁻⁶. 8ohm / sq up to 8.0×10 8 The inherent surface resistance of ohm / sq exhibits electrostatic properties that meet the above criteria.

[0079] Preferably, the rubber composite layer (230) may have a size of 4.0 × 10⁻⁶. 8 ohm / sq up to 8.0×10 8 ohm / sq, or 4.1×10 8 ohm / sq up to 7.8×10 8 ohm / sq, or 4.2×10 8 ohm / sq up to 7.5×10 8 The inherent surface resistance of ohm / sq.

[0080] According to an embodiment of the invention, the rubber composite layer (230) can exhibit excellent adhesive properties. These adhesive properties can be represented by adhesive strength. For example, according to the ASTM D4393 standard test method, the rubber composite layer (230) can exhibit an adhesive strength of 17.0 N / inch or more, or 17.0 N / inch to 17.5 N / inch. Here, the adhesive strength is a value measured using an Instron clamp (Grip, CAT. No. 2712-041) via a peel test method (crosshead speed: 125 mm / min).

[0081] When the adhesive strength of the rubber compound layer (230) is greater than 17.0 N / inch, the rubber reinforcement can adhere to the rubber without running down during tire manufacturing, thus allowing the tire manufacturing process to proceed stably. When the adhesive strength of the rubber compound layer (230) is less than 17.0 N / inch, defects may occur due to the loss of rubber reinforcement during tire manufacturing, and cavitation may occur during the manufacture of the green tire, potentially increasing the tire defect rate.

[0082] The rubber reinforcement materials (201, 301) according to the above embodiments can be applied to at least one of the crown layer (90), belt layer (50) and carcass (70) of a tire.

[0083] II. Preparation methods of rubber-reinforced materials

[0084] According to another embodiment of the present invention, a method for preparing the rubber reinforcing material is provided, comprising the following steps:

[0085] Preparation of fiber substrate;

[0086] An adhesive layer is formed on the fiber substrate; and

[0087] A rubber compound solution is applied to the adhesive layer and then heat-treated to form a rubber compound layer on the adhesive layer.

[0088] The rubber compound solution is prepared by adding one component contained in the rubber compound solution at a temperature of 50°C to 110°C and a speed of 30 rpm to 50 rpm, and simultaneously mixing other components in sequence for 30 to 120 seconds while stirring.

[0089] For a detailed description of the fiber substrate (210), the description of “I. Rubber Reinforcing Material” shall be used.

[0090] The step of forming an adhesive layer (220) on the fiber substrate (210, 110) is performed.

[0091] The adhesive layer (220) may be formed from an adhesive coating solution containing resorcinol-formaldehyde-latex (RFL) and a solvent.

[0092] For example, the adhesive coating solution can be applied to the fiber substrate (210, 110) by immersing it in the adhesive coating solution. Alternatively, the immersion process can be achieved by passing the fiber substrate (210, 110) through the adhesive coating solution. This immersion can be carried out in an immersion apparatus capable of controlling tension, immersion time, and temperature.

[0093] Alternatively, the adhesive coating solution can be applied to the fiber substrate (210, 110) by using a doctor blade or coating machine, or by spraying with a sprayer.

[0094] The step of forming the adhesive layer (220) may further include applying an adhesive coating solution onto the fiber substrate (210, 110) and heat-treating it at 130°C to 250°C for 80 to 120 seconds. This heat treatment can be performed in conventional equipment used for heat treatment. Through heat treatment, the resorcinol-formaldehyde-latex (RFL) can be cured or fixed to form the adhesive layer (220). This heat treatment allows for a more stable formation of the adhesive layer (220).

[0095] Subsequently, the rubber compound solution is coated onto the adhesive layer (220) and heat-treated to form a rubber compound layer (230) on the adhesive layer (220).

[0096] The rubber compound solution may contain an elastic polymer, sulfur, a vulcanization accelerator, and a vulcanization retarder.

[0097] The elastic polymer can be one or more rubbers selected from natural rubber and synthetic rubber. For example, the elastic polymer can be one or more rubbers selected from natural rubber (NR), styrene-butadiene rubber (SBR), butadiene rubber (BR), chloroprene rubber (CR), isobutylene rubber (IBR), isoprene rubber (IR), nitrile rubber (NBR), butyl rubber, and chloroprene rubber.

[0098] According to an embodiment of the invention, the rubber compound solution preferably comprises 60 to 70 phr (parts per hundred parts of rubber) of natural rubber, 30 to 40 phr of styrene-butadiene rubber, 1 to 5 phr of sulfur, 1 to 5 phr of vulcanization accelerator and 0.1 to 0.5 phr of vulcanization retarder.

[0099] That is, in order to form a rubber compound layer (230) with uniform thickness and properties, the rubber compound solution preferably contains components within the above-mentioned content range. A rubber compound solution that does not meet the above content range may not be able to be coated to a uniform thickness, thus leading to deterioration of fatigue performance. Furthermore, if the above content range is not met, the rubber compound layer (230) may not have a t50 value of 150 to 220 seconds and a t90 value of 300 to 350 seconds, resulting in deterioration of adhesive properties.

[0100] There are no specific limitations on the types of vulcanization accelerators and vulcanization retarders. Any compound that can be used as a vulcanization accelerator and vulcanization retarder in the art can be used. As a non-limiting example, N-tert-butyl-2-benzothiazole-sulfenamide (TBBS) and 1,3-diphenylguanidine (DPG) can be used as vulcanization accelerators, and N-(cyclohexylthio)phthalimide can be used as a vulcanization retarder.

[0101] Specifically, in order to form a rubber compound layer (230) with a very thin thickness and still uniformly dispersed constituent components, it is necessary to establish the temperature, stirring speed and stirring time after each component is added during the preparation of the rubber compound solution.

[0102] According to an embodiment of the present invention, the rubber compound solution is preferably prepared by adding one component contained in the rubber compound solution at 50°C to 110°C and 30 rpm to 50 rpm, and then sequentially mixing other components while stirring for 30 to 120 seconds.

[0103] When the preparation process of the rubber compound solution is carried out at a temperature below 50°C, a stirring speed of less than 30 rpm, or a stirring time of less than 30 seconds, it may be difficult to obtain a highly dispersed rubber compound solution. If the components in the rubber compound solution are not uniformly dispersed, the rubber compound solution will not be coated to a uniform thickness, thus leading to deterioration of fatigue performance and adhesive properties.

[0104] However, if the rubber compound solution is prepared at a temperature greater than 110°C, or at a stirring speed greater than 50 rpm, or at a stirring time greater than 120 seconds, the rubber compound layer may not have a t50 value of 150 to 220 seconds and a t90 value of 300 to 350 seconds, and the optimal level of adhesive properties may not be obtained.

[0105] To prepare the rubber compound solution, a commonly used mixing device, such as a propeller mixer, can be used. When using a mixing device, the mixing speed can be adjusted by considering factors such as the diameter of the mixer, the density of the medium, and the mixing force transmitted to the medium. As a non-limiting example, in the preparation example of the present invention, a 10L propeller mixer (container diameter 100cm, propeller diameter 80cm, propeller length 120cm) is used to prepare the rubber compound solution.

[0106] Preferably, the temperature, stirring speed, and stirring time can be adjusted according to the properties of the components contained in the rubber compound solution.

[0107] As a non-limiting example, the rubber compound solution can be prepared as follows:

[0108] At a temperature of 60°C to 70°C, mix natural rubber of 60 to 70 rpm for 100 to 120 seconds with stirring at 30 to 40 rpm (step (a)).

[0109] Add 30 to 40 phr of styrene-butadiene rubber to the composition comprising the mixture in step (a), and then mix them at a temperature of 100°C to 110°C with stirring at 30 rpm to 40 rpm for 30 to 60 seconds (step (b)).

[0110] Add 1 to 5 PHR of sulfur and 0.5 to 2.5 PHR of a first vulcanization accelerator to the composition comprising the mixture in step (b), and then mix them for 30 to 60 seconds at a temperature of 50°C to 60°C with stirring at 30 to 40 rpm (step (c)).

[0111] Add 0.5 to 2.5 PHR of a second vulcanization accelerator and 0.1 to 0.5 PHR of a vulcanization retarder to the composition comprising the mixture in step (c), and then mix them for 30 to 60 seconds at a temperature of 70°C to 80°C with stirring at 40 to 45 rpm (step (d)).

[0112] In addition, the rubber compound solution may also contain additives commonly used in the art.

[0113] For example, the rubber compound solution may further contain one or more additives selected from rubber solvents, carbon black, processing oils, activators, anti-aging agents, petroleum resins, and antioxidants.

[0114] There are no specific limitations on the types of adhesives, carbon black, processing oils, activators, anti-aging agents, petroleum resins, and antioxidants. Any compound that can be used as an additive in the art can be applied. As examples of non-limiting applications, 2,2'-dibenzoylamino diphenyl disulfide, etc., can be used as adhesives; zinc oxide (ZnO) and stearic acid, etc., can be used as activators; polymerized 2,2,4-trimethyl-1,2-dihydroquinoline (TMDQ) and N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine (6PPD), etc., can be used as anti-aging agents; and waxes, etc., can be used as antioxidants.

[0115] As a non-limiting example, a rubber compound solution containing additives can be prepared as follows:

[0116] At a temperature of 60°C to 70°C, and with stirring at 30 to 40 rpm, mix 60 to 70 PHR of natural rubber and 0.1 to 0.5 PHR of adhesive solvent for 100 to 120 seconds (step (1)).

[0117] Add 30 to 40 phr of styrene-butadiene rubber to the composition containing the mixture in step (1), and then mix them for 30 to 60 seconds at a temperature of 100°C to 110°C with stirring at 30 to 40 rpm (step (2)).

[0118] Add 50 to 55 phr of carbon black and 5 to 10 phr of processing oil to the composition comprising the mixture in step (2), and then mix for 30 to 60 seconds at a temperature of 90 to 100°C with stirring at 25 to 35 rpm (step (3)).

[0119] Add 5 to 10 phr of activator and 0.5 to 2.5 phr of first anti-aging agent to the composition comprising the mixture in step (3), and then mix for 30 to 60 seconds at a temperature of 100°C to 110°C with stirring at 35 to 45 rpm (step (4)).

[0120] Add 5 to 10 phr of petroleum resin, 0.5 to 2.5 phr of a second anti-aging agent, and 1 to 5 phr of an antioxidant to the composition comprising the mixture in step (4), and then mix for 30 to 60 seconds at a temperature of 90°C to 100°C with stirring at 30 to 40 rpm (step (5)).

[0121] Add 1 to 5 PHR of sulfur and 0.5 to 2.5 PHR of a first vulcanization accelerator to the composition comprising the mixture in step (5), and then mix them for 30 to 60 seconds at a temperature of 50°C to 60°C with stirring at 30 to 40 rpm (step (6)).

[0122] Add 0.5 to 2.5 PHR of a second vulcanization accelerator and 0.1 to 0.5 PHR of a vulcanization retarder to the composition containing the mixture in step (6), and then mix them for 30 to 60 seconds at a temperature of 70°C to 80°C with stirring at 40 to 45 rpm (step (7)).

[0123] The rubber compound solution may further contain a solvent capable of dissolving the elastic polymer. For example, the solvent may include at least one selected from toluene, naphtha, methanol, xylene, and tetrahydrofuran.

[0124] There are no specific limitations on the method of applying the rubber compound solution onto the adhesive layer (220), and known coating methods can be applied.

[0125] For example, in order to form a rubber compound layer (230), a fiber substrate (210, 110) on which an adhesive layer (220) is formed can be immersed in a rubber compound solution. By immersion, the rubber compound solution can be coated onto the adhesive layer (220).

[0126] As a coating method, gravure coating, microgravure coating, and comma coating can be applied. For example, by using a comma coating machine, the rubber compound solution can be coated onto the adhesive layer (220). Here, the coating can be carried out at a temperature that allows the solvent to evaporate, for example, at a temperature of 65°C to 100°C.

[0127] After the rubber compound solution is applied to the adhesive layer (220), a further heat treatment is performed. The heat treatment can be carried out in conventional equipment for heat treatment. For the heat treatment, heat can be applied at a temperature of 50°C to 160°C for 30 to 150 seconds.

[0128] The amount of rubber compound solution applied per unit area can be 75 g / m². 2Up to 300g / m 2 or 100g / m 2 Up to 200g / m 2 By controlling the amount of rubber compound solution coated per unit area of ​​the adhesive layer (220) within the above range, rubber reinforcement materials (201, 301) with thin thickness and still excellent adhesive properties and durability can be prepared.

[0129] The thickness (t1) of the rubber composite layer (230) can be 2μm to 200μm, or 5μm to 150μm, or 5μm to 100μm, or 5μm to 50μm, or 10μm to 40μm, or 20μm to 40μm.

[0130] Simultaneously, after the rubber composite layer (230) is formed, a cutting step may optionally be performed. The cutting step is the step of cutting the rubber reinforcement material (201, 301) prepared in the form of a plate as needed or according to the intended use. The cutting can be performed using a common cutting knife or a heated knife.

[0131] The rubber reinforcement materials (201, 301) prepared by the above method can be wound on a winding machine.

[0132] III. Tires

[0133] According to another embodiment of the present invention, a tire comprising the above-described rubber reinforcing material is provided.

[0134] Figure 1 This is a partial cross-sectional view of a tire (101) according to an embodiment of the present invention.

[0135] Reference Figure 1 The tire (101) includes a tread (10), a shoulder (20), a sidewall (30), a bead (40), a belt layer (50), an airtight layer (60), a carcass (70), and a crown layer (90).

[0136] The tread (10) is the part that directly contacts the road surface. The tread (10) is a robust rubber layer attached to the outside of the crown belt layer (90) and is composed of rubber with excellent wear resistance. The tread (10) performs the direct function of transmitting the driving and braking forces of the vehicle to the ground. Grooves (80) are formed in the tread (10) area.

[0137] The shoulder (20) is the edge portion and connects to the sidewall (30). Besides the sidewall (30), the shoulder (20) is also one of the weakest parts of the tire.

[0138] The sidewall (30) is the side of the tire (101) that connects the tread (10) and the bead (40), and it protects the tire carcass (70) and provides lateral stability to the tire.

[0139] The bead (40) is an area that includes steel wires wound around the end of the tire carcass (70), wherein the steel wires are coated with rubber and covered with cords. The bead (40) is used to assemble and secure the tire (101) to the rim.

[0140] The belt layer (50) is a coat layer located between the tread (10) and the carcass (70). The belt layer (50) serves to prevent damage to internal components such as the carcass (70) caused by external impacts or conditions, and it maintains the flat shape of the tread (10), thereby maintaining optimal contact between the tire (101) and the road surface. The belt layer (50) may contain a rubber reinforcement material (201) according to an embodiment of the invention (see...). Figure 2 ).

[0141] The airtight layer (60) is used in tubeless tires to replace the inner tube and is made of a special rubber with almost no or no air permeability. The airtight layer (60) prevents the air filling the tire (101) from leaking out.

[0142] The carcass (70) is formed from an overlay sheet of high-strength synthetic fiber cords and is an important part of the skeleton used to form the tire (101). The carcass (70) is used to withstand the loads and impacts applied to the tire (101) and to maintain air pressure. The carcass (70) may contain a rubber reinforcing material (201) according to an embodiment of the invention.

[0143] Grooves (80) refer to large gaps in the tread area. Grooves (80) are used to increase drainage capacity and improve grip when driving on wet roads.

[0144] The crown layer (90) is a protective layer beneath the tread (10) and protects other internal components. The crown layer (90) must be used in vehicles traveling at high speeds. Specifically, as vehicle speed increases, the belt layer of the tire deforms, deteriorating ride comfort; therefore, the importance of the crown layer (90) in preventing belt layer deformation increases. The crown layer (90) may contain a rubber reinforcement material (201) according to an embodiment of the invention.

[0145] A tire (101) according to one embodiment of the present invention includes a rubber reinforcement material (201). The rubber reinforcement material (201) may be applied to at least one of the crown layer (90), the belt layer (50), and the carcass (70).

[0146] [Beneficial Effects]

[0147] According to the present invention, a rubber reinforcing material is provided that has a thin thickness and light weight while still possessing excellent durability. This reinforcing material not only reduces the weight of the tire but also achieves improved rolling resistance. Attached Figure Description

[0148] Figure 1 This is a partial cross-sectional view of a tire according to an embodiment of the present invention.

[0149] Figure 2 This is a schematic cross-sectional view of a rubber-reinforced material according to an embodiment of the present invention.

[0150] Figure 3 This is a schematic diagram of a twisted yarn.

[0151] Figure 4 This is a schematic cross-sectional view of a rubber-reinforced material according to another embodiment of the present invention.

[0152] [Explanation of reference numerals in the attached figures]

[0153] 10: Tread

[0154] 20: Fetal shoulder

[0155] 30: Sidewall

[0156] 40: Tire bead

[0157] 50: Belt layer

[0158] 60: Airtight layer

[0159] 70: Fetus

[0160] 80: Groove

[0161] 90: Crown layer

[0162] 101: Tires

[0163] 110: Ply yarn

[0164] 111: Initial twist yarn 1

[0165] 112: Initial twist yarn 2

[0166] 201, 301: Rubber reinforcing materials

[0167] 210: Fabric base

[0168] 220: Adhesive layer

[0169] 230: Rubber compound layer Detailed Implementation

[0170] Preferred embodiments are given below to better understand the invention. However, these embodiments are given merely as examples of the invention, and the invention is not limited thereto.

[0171] Preparation Example 1

[0172] Prepare the rubber compound solution according to steps (1) to (7) below.

[0173] To prepare the rubber compound solution, a 10L propeller-type mixer (container diameter 100cm, propeller diameter 80cm, propeller length 120cm, model name SUPER-MIX MR203, manufactured by HADO Co., Ltd.) was used.

[0174] At a temperature of 70°C, 60 PHR of natural rubber (class 20 according to TSR classification standard, SIR20) and 0.1 PHR of adhesive solvent (Struktol A86) were mixed for 120 seconds with stirring at 40 rpm [step (1)].

[0175] Add 40 PHR of styrene-butadiene rubber (SBR-1502) to the mixture obtained in step (1), and then mix them for 60 seconds at 110°C with stirring at 40 rpm [step (2)].

[0176] Add 50 PHR of carbon black to the mixture obtained in step (2). N330) and 6PHR processing oil (paraffin, P-2, MICHANG), and then mix them at 100°C with stirring at 35 rpm for 60 seconds [step (3)].

[0177] Add 5 PHR of the first activator (ZnO), 2 PHR of the second activator (stearic acid) and 1.5 PHR of the first anti-aging agent (TMDQ) to the mixture obtained in step (3), and then mix them for 60 seconds at 110°C with stirring at 45 rpm [step (4)].

[0178] Add 7 PHR of petroleum resin to the mixture obtained in step (4). P-90), a second anti-aging agent (6PPD) of 1PHR and an antioxidant (wax) of 2.5PHR, and then mixed them at 100°C with stirring at 40 rpm for 60 seconds [step (5)].

[0179] The mixture obtained in step (5) was left at room temperature (25°C) for 2 hours and then mixed. Subsequently, it was mixed for 120 seconds at 70°C with stirring at 40 rpm [step (5.5)].

[0180] Add 3.4 PHR of sulfur and 0.85 PHR of first vulcanization accelerator (TBBS) to the mixture obtained in step (5.5), and then mix them for 30 seconds at 60°C with stirring at 40 rpm [step (6)].

[0181] Add 0.6 PHR of second vulcanization accelerator (DPG) and 0.2 PHR of vulcanization retarder (N-(cyclohexylthio)phthalimide) to the mixture obtained in step (6), and then mix them for 30 seconds at 80°C with stirring at 45 rpm [step (7)].

[0182] Preparation Example 2

[0183] Except for the temperature changes in steps (1), (2), (6) and (7) as follows, the rubber compound solution was prepared by the same method as in Preparation Example 1.

[0184] -Step (1): 60℃

[0185] -Step (2): 110℃

[0186] -Step (6): 50℃

[0187] - Step (7): 70℃

[0188] Preparation Example 3

[0189] Except for the following changes in the stirring speed in steps (1), (2), (6) and (7), the rubber compound solution was prepared by the same method as in Preparation Example 1.

[0190] -Step (1): 35 rpm

[0191] - Step (2): 35 rpm

[0192] - Step (6): 30 rpm

[0193] - Step (7): 40 rpm

[0194] Preparation Example 4

[0195] Except for the following changes in the mixing time in steps (1), (2), (6) and (7), the rubber compound solution was prepared by the same method as in Preparation Example 1.

[0196] -Step (1): 100 seconds

[0197] -Step (2): 45 seconds

[0198] Step (6): 60 seconds

[0199] Step (7): 60 seconds

[0200] Preparation Example 5

[0201] Except for the following changes in the contents of natural rubber, styrene-butadiene rubber and carbon black in steps (1), (2) and (3), the rubber compound solution was prepared by the same method as in Preparation Example 1.

[0202] -Step (1): Natural rubber 70PHR

[0203] -Step (2): Styrene-butadiene rubber PHR

[0204] -Step (3): Carbon Black 55PHR

[0205] Comparative Preparation Example 1

[0206] Except for the temperature changes in steps (6) and (7) as follows, the rubber compound solution was prepared by the same method as in Preparation Example 1.

[0207] -Step (6): 45℃

[0208] - Step (7): 70℃

[0209] Comparative Preparation Example 2

[0210] Except for the temperature changes in steps (1), (2), (6) and (7) as follows, the rubber compound solution was prepared by the same method as in Preparation Example 1.

[0211] -Step (1): 75℃

[0212] -Step (2): 120℃

[0213] -Step (6): 70℃

[0214] - Step (7): 90℃

[0215] Comparative Preparation Example 3

[0216] Except for the following changes in the stirring speed (rpm) in steps (1), (2), (6) and (7), the rubber compound solution was prepared by the same method as in Preparation Example 1.

[0217] -Step (1): 25 rpm

[0218] - Step (2): 35 rpm

[0219] - Step (6): 35 rpm

[0220] - Step (7): 40 rpm

[0221] Comparative Preparation Example 4

[0222] Except for the following changes in the stirring speed (rpm) in steps (1), (2), (6) and (7), the rubber compound solution was prepared by the same method as in Preparation Example 1.

[0223] -Step (1): 45 rpm

[0224] - Step (2): 40 rpm

[0225] - Step (6): 45 rpm

[0226] - Step (7): 55 rpm

[0227] Comparative Preparation Example 5

[0228] Except for the following changes in the mixing time in steps (1), (2), (6) and (7), the rubber compound solution was prepared by the same method as in Preparation Example 1.

[0229] -Step (1): 100 seconds

[0230] Step (2): 120 seconds

[0231] Step (6): 150 seconds

[0232] Step (7): 60 seconds

[0233] Examples 1 to 5

[0234] (1) Preparation of fabric substrate

[0235] Prepare 1260de nylon filaments (initial twist yarn 1) and 1500de aramid filaments (initial twist yarn 2). Using a cable corder, simultaneously perform initial twisting (counterclockwise) and retwisting (clockwise) on filaments 1 and 2 to prepare a ply yarn (110) with a twist count of 300 TPM.

[0236] A fabric is woven using plied yarn (110) as warp and cotton yarn as weft to prepare a fabric base (210) with a thickness of 0.04 mm.

[0237] (2) Formation of adhesive layer

[0238] The fabric substrate (210) is immersed in an adhesive coating solution containing 15% by weight resorcinol-formaldehyde-latex (RFL) and 85% by weight solvent (water, H2O), and then heat-treated at 150°C for 100 seconds to form an adhesive layer (220).

[0239] (3) Formation of rubber composite layer

[0240] Subsequently, a comma-shaped coating machine was used to apply the coating at 120 g / m². 2 Up to 130g / m 2 Each preparation example of the rubber compound solution is coated on the adhesive layer (220) with a coating amount per unit area, and then the solvent is evaporated at a temperature of 70°C to prepare a rubber reinforcing material (201) in which the rubber compound layer (230) is formed.

[0241] (4) Cutting

[0242] The rubber reinforcement material (201) was cut into 10 mm widths to prepare the rubber reinforcement material for the coronal layer (90). A cutting tool was used for cutting.

[0243] (5) Tire manufacturing

[0244] The cut rubber reinforcement material is used to manufacture standard 205 / 55R16 tires. To manufacture the tires, a body ply consisting of 1300De / 2 strand HMLS tire cords and a steel cord belt are used.

[0245] Specifically, rubber layers for the ply are laminated onto the airtight rubber layer, followed by lamination of the bead wires and belt layers. Then, the rubber reinforcement material prepared above is applied, and rubber layers for forming the tread, shoulder, and sidewall portions are sequentially formed to manufacture the green tire. The green tire is placed in a vulcanizing mold and vulcanized at 170°C for 15 minutes to manufacture the tire.

[0246] Comparative Examples 1 to 5

[0247] Except that each rubber compound solution obtained in the comparative preparation example is used as a rubber compound solution when forming the rubber compound layer, the rubber reinforcement material and the tire including the rubber reinforcement material are prepared by the same method as in Examples 1 to 5.

[0248] Experimental Example

[0249] (1) Thickness

[0250] In each rubber reinforcement material according to the examples and comparative examples, the thickness (t1) of the fiber substrate and the rubber composite layer was measured using a vernier caliper from Mitutoyo Corporation.

[0251] (2) Vulcanization characteristics of the rubber composite layer (t50, t90)

[0252] Samples of the rubber composite layer were collected from each rubber reinforcement material according to the examples and comparative examples. The t50 and t90 values ​​of the samples were measured using a rheometer (MDR 2000, Alpha Technologies) according to the ASTM D2084 standard test method.

[0253] (3) Pressure-sensitive adhesive properties

[0254] According to the ASTM D2979 standard test method, the pressure-sensitive tack of the adhesive in the rubber composite layer is measured under the following conditions.

[0255] - Cylinder diameter: 10mm

[0256] -Load: 300gf

[0257] - Peeling speed: 5mm / min

[0258] -Initial load: 10gf

[0259] - Loading speed at the start of the test: 10 mm / min

[0260] - Velocity to target load: 0.2 mm / min

[0261] - Duration: 20s

[0262] (4) Adhesion strength

[0263] The strip peel adhesion of the rubber composite layer was tested according to the ASTM D4393 standard test method. The test was conducted using an Instron clamp (Grip, CAT. No. 2712-041) at a crosshead speed of 125 mm / min.

[0264] (5) Fatigue strength retention rate

[0265] Fatigue strength retention rate was measured by bending fatigue testing. Specimens 30 cm in length and 1 inch in width were prepared. They were vulcanized at 170°C for 15 minutes. Before testing, the specimens were mounted on pulleys of a bending fatigue testing machine and then placed at 100°C for 30 minutes. Furthermore, the specimens were bent for 25,000 cycles at 150 RPM, 100°C, and a 1-inch pulley. Here, pulley size refers to the diameter of the pulley suspending the specimen. The fatigue strength retention rate was defined as the adhesive strength of the specimen after operation, compared to the adhesive strength before operation.

[0266] (6) Inherent surface resistance

[0267] For a prepared sample with a length of 30 cm and a width of 1 inch, the intrinsic surface resistance was measured using a resistance measuring device (model name: Insulation Tester 1550C, manufactured by FLUKE).

[0268] [Table 1]

[0269]

[0270] [Table 2]

[0271]

[0272] Referring to Tables 1 and 2, it is confirmed that, compared with the rubber composite layers formed using the rubber composite solutions of Comparative Preparation Examples 1 to 5, the rubber composite layers formed using each of the rubber composite solutions of Preparation Examples 1 to 5 have excellent vulcanization properties (t50, t90), pressure-sensitive adhesion and adhesive strength, and still have high fatigue strength retention and low inherent surface resistance.

[0273] (7) Evaluation of tire properties

[0274] A standard 205 / 60R16 tire was manufactured as a reference example using tire cords prepared by a rolling process (using two strands of nylon with a fineness of 840 denier as warp yarns and a warp density of 25 / inch).

[0275] For the tires of the Reference Example and Example 1, the following properties were measured. The property values ​​of the tire of Example 1 are converted from the property values ​​of the Reference Example (100%).

[0276] - Material weight: The weight of the rubber reinforcement material in Example 1 and the tire cord in the reference example.

[0277] - Tire weight: The weight of the tires in Example 1 and the reference example.

[0278] - High-speed driving performance: measured according to US FMVSS 139H standard test method.

[0279] -Durability I: Measured according to US FMVSS 139E standard test method.

[0280] -Durability II: Measured according to the test method of European ECE-R119 standard.

[0281] - Rolling resistance (RRC): Measured according to the test method of ISO 28580 standard.

[0282] [Table 3]

[0283] tire Example 1 (Index) Reference example (index) Material weight 30 100 Tire weight 98 100 High-speed driving performance 102 100 Durability I 102 100 Durability II 102 100 Rolling resistance (RRC) 102 100

[0284] Referring to Table 3, it is confirmed that, compared with the tire of the reference example, the tire of Example 1, which includes the rubber reinforcement material according to an embodiment of the present invention, is lightweight and still has excellent high-speed driving performance, durability and rolling resistance.

Claims

1. A rubber-reinforced material, comprising: Fiber substrate; An adhesive layer located on the fiber substrate; and The rubber compound layer located on the adhesive layer, The thickness of the rubber composite layer is 2. m to 200 m, t50 value is 150 seconds to 220 seconds, and t90 value is 300 seconds to 350 seconds. The t50 value is the time, in seconds, required to reach 50% of the maximum crosslinking density of the rubber composite layer, as measured by a rheometer according to the ASTM D2084 standard test method, and the t90 value is the time, in seconds, required to reach 90% of the maximum crosslinking density. The rubber composite layer comprises an elastic polymer, sulfur, a vulcanization accelerator, and a vulcanization retarder. The elastic polymer includes one or more rubbers selected from natural rubber, styrene-butadiene rubber, butadiene rubber, chloroprene rubber, isobutylene rubber, isoprene rubber, nitrile rubber, and butyl rubber; and The rubber composite layer further includes one or more additives selected from adhesive solvents, carbon black, processing oils, activators, anti-aging agents, and petroleum resins.

2. The rubber reinforcing material according to claim 1, wherein, The thickness of the rubber composite layer is 20. m to 40 m.

3. The rubber reinforcing material according to claim 1, wherein, The inherent surface resistivity of the rubber composite layer is 4.0 × 10⁻⁶. 8 ohm / sq up to 8.0×10 8 ohm / sq.

4. The rubber reinforcing material according to claim 1, wherein, According to the ASTM D4393 standard test method, the adhesive strength of the rubber composite layer is greater than 17.0 N / inch.

5. The rubber reinforcing material according to claim 1, wherein, The fiber substrate includes at least one of fiber yarn and fabric substrate.

6. The rubber reinforcing material according to claim 1, wherein, The adhesive layer comprises resorcinol-formaldehyde-latex (RFL).

7. A method for preparing a rubber-reinforced material according to claim 1, comprising the following steps: Preparation of fiber substrate; An adhesive layer is formed on the fiber substrate; and A rubber compound solution is applied to the adhesive layer and then heat-treated to form a rubber compound layer on the adhesive layer. The rubber compound solution is prepared by adding one component contained in the rubber compound solution at 50°C to 110°C and 30 rpm to 50 rpm, while sequentially mixing other components for 30 to 120 seconds with stirring. The rubber compound solution comprises an elastic polymer, sulfur, a vulcanization accelerator, and a vulcanization retarder. The elastic polymer includes one or more rubbers selected from natural rubber, styrene-butadiene rubber, butadiene rubber, chloroprene rubber, isobutylene rubber, isoprene rubber, nitrile rubber, and butyl rubber; and The rubber compound solution further includes one or more additives selected from rubber solvents, carbon black, processing oils, activators, anti-aging agents, and petroleum resins.

8. The preparation method according to claim 7, wherein, The rubber compound solution comprises 60 to 70 PHR (parts per hundred parts of rubber) of natural rubber, 30 to 40 PHR of styrene-butadiene rubber, 1 to 5 PHR of sulfur, 1 to 5 PHR of vulcanization accelerator and 0.1 to 0.5 PHR of vulcanization retarder.

9. The preparation method according to claim 7, wherein, The rubber compound solution is prepared by the following steps: Step (a): Mix natural rubber of 60 to 70 PHR at a temperature of 60°C to 70°C with stirring at 30 to 40 rpm for 100 to 120 seconds. Step (b): Add 30 to 40 PHR of styrene-butadiene rubber to the composition containing the mixture from step (a), and then mix them at a temperature of 100°C to 110°C with stirring at 30 to 40 rpm for 30 to 60 seconds. Step (c) involves adding 1 to 5 PHR of sulfur and 0.5 to 2.5 PHR of a first vulcanization accelerator to the composition comprising the mixture from step (b), and then mixing them at a temperature of 50°C to 60°C with stirring at 30 to 40 rpm for 30 to 60 seconds. In step (d), 0.5 to 2.5 PHR of a second vulcanization accelerator and 0.1 to 0.5 PHR of a vulcanization retarder are added to the composition containing the mixture in step (c), and then they are mixed for 30 to 60 seconds at a temperature of 70°C to 80°C with stirring at 40 to 45 rpm.

10. The preparation method according to claim 7, wherein, The rubber composite layer is formed with 2 m to 200 The thickness is m.

11. A tire comprising the rubber reinforcing material according to claim 1.

12. The tire according to claim 11, wherein, The rubber reinforcement material is applied to at least one of the crown layer, belt layer, and carcass.

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