KR102044884B1 - Sheet, method for manufacturing the same, and tire comprising the same - Google Patents

Abstract

The present invention relates to a seat, a manufacture thereof, and a tire comprising the same, wherein the seat includes tire cords, a topping rubber topping the tire cord, and a conductive fiber located on the surface of the topping rubber. ).
The sheet has a low electrical conductivity and can impart excellent conductivity to a tire to which a rubber composition having low rolling resistance properties is applied.

Description

SEAT, METHOD FOR MANUFACTURING THE SAME, AND TIRE COMPRISING THE SAME

The present invention relates to a sheet, a method for manufacturing the same, and a tire including the same, and more particularly, a sheet capable of imparting excellent conductivity to a tire to which a rubber composition having low current resistance and a low rolling resistance property is applied, and a method for manufacturing the same and the same. It's about tires.

In the past, the carbon-based rubber composition did not have a big problem for static electricity, but the application of a high silica loading (silica silica) rubber composition is increasing with increasing performance of vehicle traction and fuel economy reduction. Rubber compositions having a high silica content have a problem in discharging static electricity to the road surface.

As a method for discharging static electricity to the road surface in a tire having a low rolling resistance (LRR), it is usually possible to consider the development of an electrically conductive LRR sidewall rubber composition or an electrically conductive LRR carcass rubber composition. However, it is very difficult to develop an LRR rubber composition having a tire resistance value of 100 MΩ or less at 1000 V, which is required by an automobile manufacturer.

In addition, in the trade-off relationship, the LRR performance and the electrical conductivity require a lot of time and cost to develop a rubber composition that simultaneously satisfies the LRR performance and the electrical conductivity. In particular, since the influence of the rotational resistance of the existing sidewall rubber composition is large, when a rubber composition having low rotational resistance characteristics is used while the sidewall is abandoned, a method of imparting electrical conductivity to the carcass rubber composition is used. Is the usual way. However, in order to impart electrical conductivity to the carcass rubber composition, carbon black having improved structure, which is a direction in which the strength of the rubber or the modulus of the rubber is increased, must be used. This method has a problem in that the rubber composition is disadvantageous to heat generation during rolling, and is difficult in workability, and has a disadvantage in that workability is gradually deteriorated when carbon having a more developed structure is used in order to obtain desired conduction. Comparing the rolling resistance at the same time is technically difficult.

An object of the present invention is to provide a sheet having low electrical conductivity and capable of imparting excellent conductivity to a tire to which a rubber composition of low rolling resistance is applied.

Another object of the present invention is to provide a method for producing the sheet.

Another object of the present invention is to provide a tire comprising the seat.

According to one embodiment of the invention, the tire cord (tire cords), topping rubber topping (tipping) the tire cord, and a conductive fiber (fiber) located on the surface of the topping rubber, the conductive fiber is synthetic Copper or silver-plated fibers and cotton fibers are mixed on the surface of any one fiber selected from the group consisting of fibers, regenerated cellulose fibers and natural fibers.

The synthetic fibers may be any one selected from the group consisting of polyester fibers, polyamide fibers, polyacrylonitrile fibers and polyurethane fibers.

The regenerated cellulose fiber may be any one selected from the group consisting of regenerated cellulose fibers prepared using rayon and N-methylmorpholine N-oxide (NMMO).

The natural fiber may be any one selected from the group consisting of cotton fibers and hemp fibers.

The blend ratio of the copper or silver plated fiber and the cotton fiber on the surface may be a weight ratio of 10:90 to 90:10.

The conductive fiber may have a diameter of 10 to 100 ('S) based on a spun yarn.

The sheet may include 1 to 60 conductive fibers.

The conductive fibers may be located on both sides of the sheet or on one side facing the tire tread.

An acute angle of the angle formed by the tire cord and the conductive fiber may be 0 to 90 degrees.

The conductive fiber may be in the form of a straight or wavy shape extending from the surface of the topping rubber.

The topping rubber is 100 parts by weight of raw rubber, including 20 to 50 parts by weight of natural rubber and 50 to 80 parts by weight of emulsion-polymerized styrene butadiene rubber, and STSA (Stactical Thickness Surface Area) value is 29 to 39 m ² / g, Carbon having an Oil Absorption Number of Compressed Sample (COAN) value of 69 to 79 cc / 100 g, an Oil Absorption Number of Sample (OAN) value of 85 to 95 cc / 100 g, and an iodine adsorption amount value of 31 to 41 mg / g It may include 20 to 60 parts by weight of black.

The topping rubber is 100 parts by weight of raw rubber including 10 to 40 parts by weight of synthetic styrene butadiene rubber and 60 to 90 parts by weight of natural rubber, and STSA value of 29 to 39 m ² / g, COAN value of 69 to 79 cc / 100g, OAN value of 85 to 95 cc / 100g, 10 to 40 parts by weight of the first carbon black having an iodine adsorption value of 31 to 41 mg / g and STSA value of 70 to 80 m ² / g, COAN The value may include 20 to 50 parts by weight of the second carbon black having a value of 83 to 93 cc / 100 g, an OAN value of 96 to 108 cc / 100 g, and an iodine adsorption amount value of 76 to 88 mg / g.

The sheet may be a carcass.

According to another embodiment of the present invention, the step of producing a copper or silver plated fiber on the surface of any one of the fibers selected from the group consisting of synthetic fibers, regenerated cellulose fibers and natural fibers, copper or silver plated on the surface Texturing the fibers, blending copper or silver plated fibers with the cotton fibers to produce conductive fibers, and topping the tire cords. ) Topping with rubber, and then attaching the conductive fiber to the surface of the topping rubber upon rolling or cutting.

According to another embodiment of the present invention, a tire including the seat is provided.

The tire may have a resistance value of 0.1 MΩ to 100 MΩ at a voltage of 1000 V.

The sheet of the present invention can impart excellent conductivity to a tire to which a rubber composition having low current flowability and low rolling resistance properties is applied.

1 is a plan view showing a case in which the sheet according to an embodiment of the present invention is carcass.
FIG. 2 is a cross-sectional view taken along line AA ′ of FIG. 1.
3 is a cross-sectional view schematically showing a cross section of a tire according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

The seat according to an embodiment of the present invention includes tire cords, topping rubber topping the tire cord, and conductive fibers located on the surface of the topping rubber.

For example, the seat may be used as long as it includes a tire cord topping with the topping rubber while being used in a tire, for example, carcass, but the present invention is not limited thereto.

1 is a plan view showing a case where the sheet is carcass, and FIG. 2 is a cross-sectional view taken along the line AA ′ of FIG. 1. Hereinafter, the sheet will be described with reference to FIGS. 1 and 2.

1 and 2, the seat 100 includes a tire cord 10 and a topping rubber 20 for topping the tire cord 10. The topping rubber 20 surrounds the tire cord 10 and penetrates between the tire cords 10 so that the seat 100 is formed.

In general, the tire cord 10 may be used as long as it is a carcass cord used for a tire, and a steel cord or a textile code may be used.

On the other hand, the sheet 100 includes a conductive fiber 30 disposed on the surface of the topping rubber 20. The sheet 100 may have conductivity through the conductive fiber 30, and may improve electrostatic performance of a tire including the same.

The conductive fiber 30 is a mixture of a metal plated fiber and a cotton fiber on the surface of one of the fibers selected from the group consisting of synthetic fibers, regenerated cellulose fibers and natural fibers.

The synthetic fiber may be any one selected from the group consisting of polyester fibers, polyamide fibers, polyacrylonitrile fibers, and polyurethane fibers. The regenerated cellulose fibers may be regenerated cellulose fibers, such as lyocell fibers, prepared using rayon and N-methylmorpholine N-oxide (NMMO). The natural fiber may be any one selected from the group consisting of cotton fibers and hemp fibers.

The metal plated on the surface of any one of the fibers selected from the group consisting of synthetic fibers, regenerated cellulose fibers and natural fibers may be copper, silver, gold, platinum, etc. having excellent electrical conductivity, and may be plated with copper or silver having excellent electrical conductivity. It may have been.

Since the conductive fiber 30 is mixed with the metal-plated fiber and the cotton fiber on the surface, there is an advantage in that the adhesion to the rolled material due to a plurality of the wool. In addition, when only a metal plated fiber is applied to the surface, it is possible to obtain excellent electrical conductivity, but there may be a problem that the price increases.

The blend ratio of the metal-plated fiber and the cotton fiber on the surface may be a 10:90 to 90:10 weight ratio, specifically 40:60 to 80:20 weight ratio. If the blend ratio of the cotton fiber exceeds 10:90 weight ratio, the electrical conductivity may be too low. If the blend ratio of the cotton fiber is less than 90:10 weight ratio, the metal-plated fiber base is acrylic, so the high elongation The property may be deteriorated, adhesion to the rolled material may be disadvantageous, and in terms of cost. .

The diameter of the conductive fiber 30 may be 10 to 100 times ('S) based on a spun yarn in consideration of ease of manufacture, durability of the tire, and conductive performance. Here, the number is the surface number. The face number is referred to as number 1 when the cotton thread is 840 yards (768 m) long when the weight of the cotton thread is 1 pound (453 g). When the fineness of the conductive fiber 30 is less than 10 times ('S) on the basis of the spun yarn is too thick to act as a foreign matter inside the tire, may be disadvantageous to the tire durability, when the number of times more than 100 times (' S) on the basis of the spun yarn Since the strength is too weak, workability may be deteriorated when the conductive fiber 30 is attached to the surface of the topping rubber 20.

Considering the electrostatic performance, the conductive fiber 30, the more, the better, but since the conductive fiber 30 is expensive, the unit cost increases, there is room for the foreign matter inside the tire. Therefore, the conductive fiber 30 is to replace the air bleed yarn (Air Bleed Yarn) for removing the air between the ply (ply) in the existing tire, the minimum electrical conductivity (less than 100 MΩ resistance in the tire) ), It can be considered that the intended purpose is completed. Therefore, in consideration of the electric conductivity and the cost-effective part of the tire, it may be arranged at intervals of 20 to 700 mm, specifically 50 to 400 mm, and economically inefficient when the distance of the conductive fibers 30 is less than 20 mm. If the tire acts as a foreign material, the durability of the tire may be reduced, and if it exceeds 700 mm, it may not be possible to secure a desired level of conductivity.

The sheet 100 may include 1 to 60 conductive fibers 30. If the conductive fiber 30 is less than one, at least one conductive fiber 30 per tire produced cannot enter and thus cannot secure electrical conductivity. If the conductive fiber 30 is more than 60, it is economically inefficient and excessively large. There may be a problem of tire durability.

The conductive fiber 30 may be located on both surfaces of the topping rubber 20 as well as one surface of the topping rubber 20. When the conductive fiber 30 is located only on one surface of the topping rubber 20, the conductive fiber 30 may be located on one surface of the seat 100 facing the tire tread.

The conductive fiber 30 may be disposed at any angle or direction with respect to the tire cord 10, but when the seat 100 is mounted to the tire, the conductive fiber 30 may be oblique or perpendicular to the circumferential direction of the tire. (Radial direction) is arranged. Therefore, the acute angle of the angle formed by the tire cord 10 and the conductive fiber 30 may be 0 to 90 degrees. In addition, the conductive fiber 30 may be in the form of a straight or wavy shape extending from the surface of the topping rubber 20.

As the seat 100 effectively discharges static electricity aggregated on the tire to the road surface, the tire including the seat 100 may have a resistance value of 0.1 MΩ to 100 MΩ at a voltage of 1000 V. In order for the tire to have a resistance value of less than 0.1 MΩ at a voltage of 1000 V, there are many other trade off items, for example, by applying an energizing compound or excessively using conductive fibers. LRR), and if it exceeds 100 MΩ it may not discharge static electricity of the tire.

The seat 100 may effectively transfer the static electricity transmitted from the vehicle to the tire tread portion and transmit the static electricity to the ground. Through this, by imparting electrical conductivity in a portion other than the composition of the rubber composition, it is possible to increase the degree of freedom for the development of the low rolling resistance (LRR) of the carcass topping rubber composition and sidewall rubber composition. That is, since the demand for electrical conductivity is reduced in the sidewall rubber composition and the carcass topping rubber composition, it is possible to apply a rubber composition for improving the rolling resistance, and consequently by applying the conductive fiber 30, It can solve the problem of static electricity and improve the fuel economy of tire with low rolling resistance.

Accordingly, the topping rubber 20 is generally applicable to any of the topping rubber for textile cords used in tires, the topping rubber 20 is 20 to 50 parts by weight of natural rubber, emulsion polymerization styrene butadiene rubber 50 With respect to 100 parts by weight of the raw rubber including from 80 parts by weight, the particle size is large, the LRR characteristics consisting of 20 to 60 parts by weight of carbon black does not develop much structure may have an excellent composition. When the topping rubber 20 is formed as described above, styrene butadiene rubber is advantageous in that the adhesive is included, and internal heat is reduced by using carbon black having no structure, which is advantageous for rotational resistance and carbon. It is preferable at the point which heat | fever is reduced with less weight part of black. Even when the tire includes the topping rubber 20 having the composition described above, the tire may have a resistance value of 0.1 MΩ to 100 MΩ at a voltage of 1000 V as the sheet 100 is included. The carbon black, which has a large particle size and does not develop much in structure, has a STSA (Statistical Thickness Surface Area) value of 29 to 39 m ² / g, a COAN (Oil Absorption Number of Compressed Sample) value of 69 to 79 cc / 100 g, and The carbon black may have an oil absorption number of sample (OAN) of 85 to 95 cc / 100 g and an iodine adsorption amount of 31 to 41 mg / g.

Nevertheless, the topping rubber 20 may be an electrically conductive topping rubber composition to further improve the electrical conductivity of the sheet 100. The electrically conductive topping rubber composition comprises a first carbon having a relatively large particle size and a less developed structure with respect to 100 parts by weight of raw rubber including 10 to 40 parts by weight of synthetic styrene butadiene rubber and 60 to 90 parts by weight of natural rubber. It may have a composition consisting of 10 to 40 parts by weight of black, 20 to 50 parts by weight of the second carbon black having a relatively small particle size and relatively well developed structure. The first carbon black having a relatively large particle size and relatively less structure has an STSA value of 29 to 39 m ² / g, a COAN value of 69 to 79 cc / 100 g, and an OAN value of 85 to 95 cc / It may be 100g, carbon black having an iodine adsorption value of 31 to 41 mg / g. The second carbon black having a relatively small particle size and relatively well developed structure has a STSA value of 70 to 80 m ² / g, a COAN value of 83 to 93 cc / 100 g, and an OAN value of 96 to 108 cc / It may be 100g, carbon black having an iodine adsorption amount value of 76 to 88 mg / g.

In addition, the sidewall rubber can be applied to a rubber composition of low electrical conductivity, low rotational resistance characteristics. The sidewall rubber has a composition consisting of 20 to 70 parts by weight of carbon black having a large particle size and not much structure, based on 100 parts by weight of raw rubber including 30 to 70 parts by weight of natural rubber and 30 to 70 parts by weight of synthetic butadiene rubber. Can have When the sidewall rubber is formed as described above, heat generation is reduced, which is preferable in terms of excellent fuel economy. The tire may have a resistance value of 0.1 MΩ to 100 MΩ at a voltage of 1000 V even when the sheet 100 includes the sidewall rubber having the composition described above. The carbon black, which has a large particle size and does not develop much in structure, has a STSA (Statistical Thickness Surface Area) value of 29 to 39 m ² / g, a COAN (Oil Absorption Number of Compressed Sample) value of 69 to 79 cc / 100 g, and The carbon black may have an oil absorption number of sample (OAN) of 85 to 95 cc / 100 g and an iodine adsorption amount of 31 to 41 mg / g.

On the other hand, the sidewall rubber may be an electrically conductive topping rubber composition to further improve the electrical conductivity of the tire. The electrically conductive sidewall rubber composition is based on 100 parts by weight of the raw rubber including 70 parts by weight of natural rubber and 30 parts by weight of synthetic butadiene rubber, 30 parts by weight of the first carbon black having a relatively large particle size and relatively less developed structure, It may have a composition consisting of 20 parts by weight of the third carbon black having a relatively small particle size and relatively well developed structure. The first carbon black having a relatively large particle size and a relatively less developed structure has a STSA (Statistical Thickness Surface Area) value of 29 to 39 m ² / g and a COAN (Oil Absorption Number of Compressed Sample) value of 69 to The carbon black may be 79 cc / 100g, an OA (Oil Absorption Number of Sample) value of 85 to 95 cc / 100g, and an iodine adsorption amount value of 31 to 41 mg / g. The third carbon black having a relatively small particle size and relatively well developed structure has a STSA (Statistical Thickness Surface Area) value of 118 to 129 m ² / g, and a COAN value of 91 To 101 cc / 100g, an OAN (Oil Absorption Number of Sample) value of 108 to 118 cc / 100g, and an iodine adsorption amount value of 150 to 165 mg / g.

Method for producing a sheet 100 according to another embodiment of the present invention comprises the steps of preparing a metal plated fiber on the surface of any fiber selected from the group consisting of synthetic fibers, regenerated cellulose fibers and natural fibers, the Texturing the metal-plated fiber on the surface, mixing the metal-plated fiber on the texturized surface with cotton fiber to produce the conductive fiber 30, and the tire cord 10 After topping with the topping rubber 20, the step of attaching the conductive fiber 30 to the surface of the topping rubber 20 when rolling or cutting.

First, a metal plated fiber is produced on the surface.

The metal-plated fiber on the surface is prepared by immersing any fiber selected from the group consisting of the synthetic fiber, regenerated cellulose fiber and natural fiber in an electrolyte solution containing a metal salt, followed by electroplating or electroless plating, or physical Metal may be plated on the surface of the fiber by vapor deposition or chemical vapor deposition.

Since any of the fibers selected from the group consisting of the synthetic fibers, regenerated cellulose fibers and natural fibers, and the metal are as described above, repeated descriptions thereof will be omitted.

However, as an example, the copper plated fiber may be electroplated after immersing any fiber selected from the group consisting of the synthetic fiber, regenerated cellulose fiber and natural fiber in an electrolyte solution containing a metal salt such as copper sulfate. The metal may be plated on the surface by electroless plating or by physical vapor deposition or chemical vapor deposition.

Next, the metal-plated fiber is textured on the surface.

The reason for the texturing of the metal-plated fiber on the manufactured surface is to proceed with spinning after producing a sliver through carding and combing for spinning with the cotton fiber. The filament filaments have a strong straightness, so that even after spinning to a certain length, spinning is impossible, so that the blend is smoothly applied by giving a crimp through texturing.

As the texturing method, all generally known false-twist methods, stuffer-box methods, or air-jet texturing methods can be used. Among these, the above flammable method can be used representatively, and in the case of thermoplastic fibers, the stamping method can be appropriately used.

Natural fibers coated with metal on the textured surface may be cut to a length of 1 to 5 cm to prepare staple fibers and then blended with the cotton fibers. When using a filament type filament rather than the short fiber as the metal plated fiber, the conductive fiber 30 is disadvantageous to mechanical adhesion when attaching the conductive fiber 30 to the surface of the topping rubber 20, The conductive fiber 30 may be separated during the process.

Next, the conductive fiber 30 is manufactured by blending the fiber coated with metal on the textured surface with the cotton fiber.

The method of blending the metal-plated fiber and the cotton fiber on the surface of the tire cord 10 may be manufactured without difficulty since it is well known in the art for blending various types of fibers during the production of the tire cord 10.

Finally, after topping the tire cord 10 with the topping rubber 20, the conductive fiber 30 is attached to the surface of the topping rubber 20 during rolling or cutting.

Specifically, the conductive fiber 30 may be attached to the surface of the sheet 100 at any part of the process between immediately after the sheet 100 passes through the calendar and between the winding process of the rolled product. At this time, the attachment method is to supply the conductive fiber 30 to the surface of the rolled sheet 100 in progress and at the same time by pressing with attachment using a roller or the like, or by mounting a fiber guide (yarn guide) to the conductive fiber ( After fixing the attachment position of 30), a method such as attaching in accordance with the movement of the rolled sheet 100 may be applied. As the attachment facility, a conventional air bleed yarn attachment facility may be utilized.

A tire according to another embodiment of the present invention includes the seat 100. 3 is a cross-sectional view schematically showing a cross section of the tire.

Referring to FIG. 3, the tire 200 includes a tread portion 210, a side wall portion 220, a belt portion 230, a carcass portion 240, and an inner liner portion 250. The tire 200 is not limited to the above structure, and all tire structures known in the art may be applied.

The tread part 210 is a portion in direct contact with the ground and transmits a driving force and a braking force of the vehicle to the road surface, and may include a cap tread 211 and an under tread 212. The side wall 220 serves as an intermediate position to protect the carcass portion 240 from external impact and to transfer the movement of the steering wheel to the tread portion 210 via a bead (not shown). The belt unit 230 includes a configuration such as a belt for adjusting the performance of road surface traction and handling, a reinforcing cap ply and a belt cushion for preventing separation between the steel belt layers. can do. The carcass portion 240 serves as a skeleton forming a skeleton of the tire and supports the load added from the outside by maintaining the air pressure with the inner liner 250. The inner liner 250 functions to maintain the air pressure inside the tire.

In this case, the sheet 100 may be applied to the carcass unit 240. When the tire 200 includes the seat 100 in the carcass 240, the static electricity generated in the vehicle is transferred to the sidewall 220 through a wheel of the vehicle, and then the belt. Passing through the portion 230, the carcass portion 240 and the tread portion 210 is discharged to the ground.

Meanwhile, the tire 200 may be a general passenger tire, but the present invention is not limited thereto, and the tire 200 may include a passenger car tire, a light truck tire, an SUV tire, and an off-the-road. ) Tires, bias truck tires or bias bus tires. In addition, the tire 200 may be a radial tire or a bias tire.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

(Examples 1 to 7 and Comparative Examples 1 to 3)

As shown in Tables 1 and 2 below, tire 225 / 45R17 standards were selected, and general cotton fibers were used in Comparative Examples 1 to 3, and Carcass was used in Examples 1 to 7 using copper plated conductive fibers. Prepared. In Comparative Examples 1 to 3 and Examples 1 to 7, 8 fibers were used for one tire.

division Comparative Example 1 Example 1 Example 2 Example 3 Example 4 standard 225 / 45R17 225 / 45R17 225 / 45R17 225 / 45R17 225 / 45R17 Application area Carcass surface Carcass surface Carcass surface Carcass surface Carcass surface Applied fiber Cotton Material 30's Spun Yarn 20's fiber mixed with copper electroplated polyacrylonitrile fiber and cotton fiber in a 2: 8 weight ratio 20's fiber mixed with copper electroplated polyacrylonitrile fiber and cotton fiber in a 4: 6 weight ratio 20's fiber with copper electroplated polyacrylonitrile fiber and cotton fiber blended at 6: 4 weight ratio 30's fiber mixed with copper electroplated polyacrylonitrile fiber and cotton fiber in a 6: 4 weight ratio Carcass topping rubber composition ¹⁾ General rubber composition (non-conductive) General rubber composition (non-conductive) General rubber composition (non-conductive) General rubber composition (non-conductive) General rubber composition (non-conductive) Sidewall rubber composition ²⁾ General Rubber Composition (Current) General Rubber Composition (Current) General Rubber Composition (Current) General Rubber Composition (Current) General Rubber Composition (Current)

1) Carcass topping rubber composition: with respect to 100 parts by weight of raw rubber including 30 parts by weight of synthetic styrene-butadiene rubber and 70 parts by weight of natural rubber, with 70 parts by weight of carbon black having a characteristic of large particle size and no structure development A non-conductive generic rubber composition. The carbon black, which has a large particle size and no structure, has an STSA value of 34 m ² / g, a COAN value of 74 cc / 100g, an OAN value of 90 cc / 100g, and an iodine adsorption value of 36 mg / g Phosphorus carbon black.

2) sidewall rubber composition: 30 parts by weight of the first carbon black having a relatively large particle size and relatively less structure, based on 100 parts by weight of raw rubber including 70 parts by weight of natural rubber and 30 parts by weight of synthetic butadiene rubber, A rubber composition having electrical conductivity consisting of 20 parts by weight of the third carbon black having a relatively small particle size and relatively well developed structure. The first carbon black having a relatively large particle size and a relatively less developed structure has an STSA value of 34 m ² / g, a COAN value of 74 cc / 100g, an OAN value of 90 cc / 100g, and an iodine adsorption amount Carbon black with a value of 36 mg / g. The third carbon black having a relatively small particle size and relatively well developed structure has an STSA value of 123 m ² / g, a COAN value of 96 cc / 100 g, an OAN value of 113 cc / 100 g, and iodine adsorption Carbon black with a dose value of 160 mg / g.

division Comparative Example 2 Comparative Example 3 Example 5 Example 6 Example 7 standard 225 / 45R17 225 / 45R17 225 / 45R17 225 / 45R17 225 / 45R17 Application area Carcass surface Carcass surface Carcass surface Carcass surface Carcass surface Applied fiber Cotton material 30's
cotton yarn Cotton material 30's
cotton yarn 20's fiber mixed with copper electroplated polyacrylonitrile fiber and cotton fiber in a 4: 6 weight ratio 20's fiber with copper electroplated polyacrylonitrile fiber and cotton fiber blended at 6: 4 weight ratio 30's fiber mixed with copper electroplated polyacrylonitrile fiber and cotton fiber in a 6: 4 weight ratio Carcass topping rubber composition ¹⁾ LRR rubber composition
(Non-energized) Energized rubber composition LRR rubber composition
(Non-energized) LRR rubber composition
(Non-energized) LRR rubber composition
(Non-energized) Sidewall rubber composition ²⁾ LRR rubber composition
(Non-energized) Energized rubber composition LRR rubber composition
(Non-energized) LRR rubber composition
(Non-energized) LRR rubber composition
(Non-energized)

1) Carcass topping rubber composition (LRR rubber composition): With respect to 100 parts by weight of raw material rubber including 70 parts by weight of emulsion-polymerized styrene butadiene rubber and 30 parts by weight of natural rubber, the particle size is large and the structure does not develop much. LRR rubber composition having 30 parts by weight of carbon black. The carbon black, which has a large particle size and does not develop much in structure, has an STSA value of 34 m ² / g, a COAN value of 74 cc / 100g, an OAN value of 90 cc / 100g, and an iodine adsorption value of 36 mg / g carbon black.

Carcass Topping Rubber Composition (Current Rubber Composition): A first particle having a relatively large particle size and a relatively less developed structure, based on 100 parts by weight of raw rubber including 30 parts by weight of synthetic styrene butadiene rubber and 70 parts by weight of natural rubber. An electrically conductive topping rubber composition comprising 30 parts by weight of carbon black and 40 parts by weight of the second carbon black having a relatively small structure and a well-developed structure. The first carbon black having a relatively large particle size and a relatively less developed structure has an STSA value of 34 m ² / g, a COAN value of 74 cc / 100g, an OAN value of 90 cc / 100g, and an iodine adsorption amount Carbon black with a value of 36 mg / g. The second carbon black having a relatively small particle size and relatively well developed structure has an STSA value of 75 m ² / g, a COAN value of 88 cc / 100g, an OAN value of 102 cc / 100g, and an iodine adsorption amount Carbon black with a value of 82 mg / g.

2) Sidewall rubber composition (LRR rubber composition): 50 parts by weight of carbon black filler having a large particle size and not much structure, based on 100 parts by weight of raw rubber including 50 parts by weight of natural rubber and 50 parts by weight of synthetic butadiene rubber. LRR rubber composition consisting of parts. The carbon black, which has a large particle size and does not develop much in structure, has an STSA value of 34 m ² / g, a COAN value of 74 cc / 100g, an OAN value of 90 cc / 100g, and an iodine adsorption value of 36 mg / g carbon black.

Sidewall rubber composition (energized rubber composition): First carbon black 30 having a relatively large particle size and a relatively low structure with respect to 100 parts by weight of raw rubber including 70 parts by weight of natural rubber and 30 parts by weight of synthetic butadiene rubber. A rubber composition having excellent electrical conductivity consisting of 20 parts by weight of the third carbon black having a relatively small part by weight and a relatively small particle size and a relatively good structure.

The first carbon black having a relatively large particle size and a relatively less developed structure has an STSA value of 34 m ² / g, a COAN value of 74 cc / 100g, an OAN value of 90 cc / 100g, and an iodine adsorption amount Carbon black with a value of 36 mg / g. The third carbon black having a relatively small particle size and relatively well developed structure has an STSA value of 123 m ² / g, a COAN value of 96 cc / 100 g, an OAN value of 113 cc / 100 g, and iodine adsorption Carbon black with a dose value of 160 mg / g.

Experimental Example 1

The energization performance and durability performance of the tire manufactured in the said Example and the comparative example were measured, and the result is shown in following Table 3 and Table 4.

division Comparative Example 1 Example 1 Example 2 Example 3 Example 4 Electrical resistance
(Tyre phase measurement) 29.9 GΩ 10 MΩ 1 MΩ 0.5 MΩ 2.0 MΩ High Speed Durability 100 min 100 min 100 min 100 min 100 min General durability 60 hr 60 hr 60 hr 60 hr 60 hr Long-term durability 400 hr 400 hr 400 hr 400 hr 400 hr RRc (Index) 100 100 100 95 95

division Comparative Example 2 Comparative Example 3 Example 5 Example 6 Example 7 Electrical resistance
(Tyre phase measurement) 29.9 GΩ 50 MΩ 10 M Ω 7.0 MΩ 15.1 MΩ High Speed Durability 100 min 100 min 100 min 100 min 100 min General durability 60 hr 60 hr 60 hr 60 hr 60 hr Long-term durability 400 hr 400 hr 400 hr 400 hr 400 hr RRc (Index) 95 105 95 95 95

In Tables 3 and 4, the electrical resistance was measured by applying a voltage of 1000 V to the ground and the rim of the tire, and the high speed durability, general durability, and long term durability were compared to the load index. It measured at the conditions of 140% and 80 km / h. The rotational resistance (RRc) was measured by the ISO 20580 method, and Comparative Example 1 was indexed to 100, indicating a low value.

Referring to Table 3 and Table 4, it can be confirmed that the electrical resistance is lowered in the case of Examples 1 to 4 compared to Comparative Example 1 has improved the conduction performance. In addition, in the case of Examples 1 to 4, it was confirmed that there was no change in the durability performance and the rotational resistance (RR) even though the current carrying performance was improved.

In addition, referring to Comparative Examples 2 to 3, it can be seen that the current carrying performance is very reduced when the LRR rubber composition is applied to the carcass topping rubber composition and sidewall rubber composition. On the other hand, Examples 5 to 7 can be confirmed that even when the LRR rubber composition is used in the carcass topping rubber composition and the sidewall rubber composition by applying the conductive fibers, the electrical resistance is lowered to improve the current carrying performance. In addition, in the case of Examples 5 to 7 it was confirmed that there is no change in durability performance and rotational resistance (RR) even though the current carrying performance was improved.

The present invention has been described above by way of example, and those skilled in the art will appreciate that various modifications may be made without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed herein are not intended to limit the present invention but to describe the present invention, and the spirit and scope of the present invention are not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all the technologies within the equivalent scope should be interpreted as being included in the scope of the present invention.

100: sheet
10: tire cord
20: topping rubber
30: conductive fiber
200: tire
210: tread section
211: cap tread 212: under tread
220: sidewall
230: belt part
240: carcass
250: inner liner

Claims (16)

Tire cords,
Topping rubber to topping the tire cord, and
Conductive fibers located on the surface of the topping rubber (fiber),
The conductive fiber is a mixture of copper or silver plated fibers and cotton fibers on the surface of any one fiber selected from the group consisting of synthetic fibers, regenerated cellulose fibers and natural fibers,
The topping rubber is 100 parts by weight of raw rubber including 20 to 50 parts by weight of natural rubber and 50 to 80 parts by weight of emulsion polymerization styrene butadiene rubber, and STSA (Statistical Thickness Surface Area) value is 29 to 39 m ² / g, Carbon having an Oil Absorption Number of Compressed Sample (COAN) value of 69 to 79 cc / 100 g, an Oil Absorption Number of Sample (OAN) value of 85 to 95 cc / 100 g, and an iodine adsorption amount value of 31 to 41 mg / g 20 to 60 parts by weight of black, or
The topping rubber is 100 parts by weight of raw rubber including 10 to 40 parts by weight of synthetic styrene butadiene rubber and 60 to 90 parts by weight of natural rubber, and STSA value of 29 to 39 m ² / g, COAN value of 69 to 79 cc / 100g, OAN value of 85 to 95 cc / 100g, 10 to 40 parts by weight of the first carbon black having an iodine adsorption value of 31 to 41 mg / g and STSA value of 70 to 80 m ² / g, COAN A sheet containing from 20 to 50 parts by weight of a second carbon black having a value of 83 to 93 cc / 100 g, an OAN value of 96 to 108 cc / 100 g, and an iodine adsorption amount value of 76 to 88 mg / g. The method of claim 1,
The synthetic fiber is any one selected from the group consisting of polyester fiber, polyamide fiber, polyacrylonitrile fiber and polyurethane fiber. The method of claim 1,
The regenerated cellulose fiber is any one selected from the group consisting of regenerated cellulose fibers prepared using rayon and N-methylmorpholine N-oxide (NMMO). The method of claim 1,
The natural fiber is any one selected from the group consisting of cotton (cotton) fibers and hemp fibers. The method of claim 1,
The sheet of copper or silver plated fiber and the cotton fiber in the blend ratio of 10:90 to 90:10 by weight. The method of claim 1,
The diameter of the conductive fiber is 10 to 100 sheets ('S) based on the spun yarn (spun yarn). The method of claim 1,
Wherein said sheet comprises from 1 to 60 of said conductive fibers. The method of claim 1,
Wherein the conductive fiber is located on both sides of the sheet or on one side facing the tire tread. The method of claim 1,
The acute angle of the angle between the tire cord and the conductive fiber is 0 to 90 ° sheet. The method of claim 1,
Wherein the conductive fiber is in the form of a straight or wavy shape extending from the surface of the topping rubber. delete delete The method of claim 1,
The sheet is a carcass. Preparing a fiber coated with copper or silver on the surface of any one fiber selected from the group consisting of synthetic fiber, regenerated cellulose fiber and natural fiber,
Texturing the copper or silver plated fibers on the surface;
Mixing conductive fibers coated with copper or silver on the textured surface with cotton fibers to produce conductive fibers, and
Topping the tire cords with topping rubber, and then attaching the conductive fibers to the surface of the topping rubber when rolling or cutting,
The topping rubber is 100 parts by weight of raw rubber including 20 to 50 parts by weight of natural rubber and 50 to 80 parts by weight of emulsion polymerization styrene butadiene rubber, and STSA (Statistical Thickness Surface Area) value is 29 to 39 m ² / g, Carbon having an Oil Absorption Number of Compressed Sample (COAN) value of 69 to 79 cc / 100 g, an Oil Absorption Number of Sample (OAN) value of 85 to 95 cc / 100 g, and an iodine adsorption amount value of 31 to 41 mg / g 20 to 60 parts by weight of black, or
The topping rubber is 100 parts by weight of raw rubber including 10 to 40 parts by weight of synthetic styrene butadiene rubber and 60 to 90 parts by weight of natural rubber, and STSA value of 29 to 39 m ² / g, COAN value of 69 to 79 cc / 100g, OAN value of 85 to 95 cc / 100g, 10 to 40 parts by weight of the first carbon black having an iodine adsorption value of 31 to 41 mg / g and STSA value of 70 to 80 m ² / g, COAN A method of producing a sheet comprising 20 to 50 parts by weight of second carbon black having a value of 83 to 93 cc / 100 g, an OAN value of 96 to 108 cc / 100 g, and an iodine adsorption amount value of 76 to 88 mg / g. A tire comprising the seat according to claim 1. The method of claim 15,
The tire has a resistance value of 0.1 MΩ to 100 MΩ at a voltage of 1000 V.

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