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CN-117561169-B - Tire with a tire body

CN117561169BCN 117561169 BCN117561169 BCN 117561169BCN-117561169-B

Abstract

A tire is provided, which comprises reinforcing layers (6 a, 6 b) composed of a reinforcing material and a vulcanized rubber covering the reinforcing material, wherein the vulcanized rubber is composed of a rubber composition containing N-cyclohexyl-2-benzothiazolyl sulfenamide, the reinforcing material comprises a steel cord surface coated with a ternary plating layer of copper, zinc and iron, the reinforcing layers (6 a, 6 b) are arranged on the inner side in the radial direction of the tread surface of the tire, and the ratio (a/b) of the modulus (a) when the elongation of the vulcanized rubber covering the reinforcing material in the tire width direction central part (6C) of the reinforcing layers (6 a, 6 b) is 50% to the modulus (b) when the elongation of the vulcanized rubber covering the reinforcing material in the tire width direction end part (6E) of the reinforcing layers (6 a, 6 b) is 50% is 0.94 to 1.06. The tire has a high modulus and excellent productivity.

Inventors

  • Tangbata has a high reputation
  • ONOUE Shingo
  • Saito Haojie

Assignees

  • 株式会社普利司通

Dates

Publication Date
20260505
Application Date
20220322
Priority Date
20210622

Claims (8)

  1. 1. A tire comprising a reinforcing layer comprising a reinforcing material and a vulcanized rubber covering the reinforcing material, wherein The vulcanized rubber is a vulcanized rubber of a rubber composition containing N-cyclohexyl-2-benzothiazolyl sulfenamide, the content of the N-cyclohexyl-2-benzothiazolyl sulfenamide is 0.4 parts by mass or more and 3 parts by mass or less relative to 100 parts by mass of the rubber component, The reinforcing material comprises a metal in which the surface of the steel cord is covered with a ternary plating of copper, zinc and iron, The reinforcing layer is disposed radially inward of the tread surface, and The ratio of the modulus a when the elongation of the vulcanized rubber of the reinforcing material is 50% in the tire width direction central portion of the reinforcing layer to the modulus b when the elongation of the vulcanized rubber of the reinforcing material is 50% in the tire width direction end portion of the reinforcing layer, that is, a/b is 0.94 or more and 1.06 or less, the modulus when the elongation is 50% is measured by subjecting a sample to a tensile test according to JIS K6251:2017 at room temperature, that is, 25 ℃, the tire width direction central portion of the reinforcing layer means a 1/5 portion located at the center in the tire width direction when the reinforcing layer is equally divided into 5 portions in the tire width direction in a plane parallel to the tire equatorial plane, and the tire width direction end portions of the reinforcing layer means a pair of 1/5 portions located at the two outermost sides in the tire width direction when the reinforcing layer is equally divided into 5 portions in the tire width direction in the plane parallel to the tire equatorial plane.
  2. 2. The tire of claim 1, wherein the amount of iron in the overlay is greater than 1 mass% and less than 10 mass% of the total mass of the copper, the zinc, and the iron.
  3. 3. The tire of claim 1 or 2, wherein the amount of phosphorus in the overlay is greater than 0mg/m 2 and less than or equal to 4mg/m 2 .
  4. 4. The tire of claim 1 or 2, wherein the steel cord is drawn through a diamond die.
  5. 5. The tire according to claim 1 or 2, wherein the rubber composition comprises a rubber component comprising 50 mass% or more of a polyisoprene-based rubber.
  6. 6. The tire according to claim 1 or 2, wherein the rubber composition has a cobalt-containing compound content of 0.01 mass% or less.
  7. 7. The tire of claim 1 or 2, wherein the rubber composition comprises an alkylphenol resin.
  8. 8. Tyre according to claim 1 or 2, wherein the content of cobalt atoms is 1% by mass or less.

Description

Tire with a tire body Technical Field The present disclosure relates to tires. Background In a tire, a reinforcing layer obtained by covering a reinforcing material such as a metal cord with rubber is generally disposed as a belt on the inner side in the tire radial direction of the tread surface of the tire and the outer side in the tire radial direction of the crown portion of the carcass to improve the durability of the tire (see japanese patent application laid-open No. 2017-31240). In manufacturing a tire, a reinforcing material-rubber composite is generally prepared in advance by covering a reinforcing material with rubber, and in a green tire forming process, the reinforcing material-rubber composite is laminated with other rubber members to be bonded to the green tire, and then a vulcanization process is performed to obtain a part (reinforcing layer) of the tire. Furthermore, international publication No. 2020/156967 describes steel cords with brass coating rich in iron particles, which allow to use ternary alloy coatings even with cobalt-free compounds. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2017-31240 Patent document 2 International publication No. 2020/156967 Disclosure of Invention (Problem to be solved by the invention) However, the tire vulcanization process of patent document 1 requires vulcanization to be performed at a temperature as high as possible for a short time to improve the productivity of the tire. When a green tire including a reinforcing material-rubber compound as a belt (reinforcing layer) obtained using a cover rubber conventionally used for a belt is molded and vulcanized at a high temperature, a portion of the belt (reinforcing layer) where vulcanization progresses rapidly (particularly a central portion in the tire width direction of the belt) greatly advances in vulcanization, passes through an appropriate vulcanized state, and becomes oversvulcanized. Thus, when over-vulcanization, the modulus of the portion where vulcanization progresses rapidly decreases, which results in a change in modulus over the entire belt. When the variation in modulus of the belt is large, the tire performance deteriorates. Therefore, there is a limit in improving productivity of tires by increasing the vulcanization temperature. Further, patent document 2 does not mention productivity of a tire. Therefore, it may be helpful to provide a tire having a high modulus and excellent productivity. (Solution for solving the problem) <1> A tire comprising a reinforcing layer comprising a reinforcing material and a vulcanized rubber covering the reinforcing material, wherein The vulcanized rubber is a vulcanized rubber of a rubber composition comprising N-cyclohexyl-2-benzothiazolyl sulfenamide, The reinforcing material comprises a metal in which the surface of the steel cord is covered with a ternary plating of copper, zinc and iron, The reinforcing layer is disposed radially inward of the tread surface, and The ratio (a/b) of the modulus (a) when the elongation of the vulcanized rubber covering the reinforcing material at the tire width direction central portion of the reinforcing layer is 50% to the modulus (b) when the elongation of the vulcanized rubber covering the reinforcing material at the tire width direction end portion of the reinforcing layer is 50% is 0.94 or more and 1.06 or less. The tire of the present disclosure has excellent productivity because the modulus of the vulcanized rubber covering the reinforcing material is uniform in the reinforcing layer, and vulcanization can be performed at high temperature for a short time. <2> The tire according to aspect <1>, wherein the amount of iron in the overlay is 1 mass% or more and less than 10 mass% of the total mass of copper, zinc and iron. <3> The tire of aspect <1> or <2>, wherein the amount of phosphorus in the overlay is greater than 0mg/m 2 and less than or equal to 4mg/m 2. <4> The tire according to any one of aspects <1> to <3>, wherein the steel cord is drawn by a diamond die. <5> The tire according to any one of aspects <1> to <4>, wherein the rubber composition comprises a rubber component comprising 50 mass% or more of the polyisoprene-based rubber. <6> The tire according to any one of aspects <1> to <5>, wherein the rubber composition has a cobalt-containing compound content of 0.01 mass% or less. <7> The tire according to any one of aspects <1> to <6>, wherein the rubber composition comprises an alkylphenol resin. <8> The tire according to any one of aspects <1> to <7>, wherein the content of cobalt atoms is 1 mass% or less. ADVANTAGEOUS EFFECTS OF INVENTION According to the present disclosure, a tire having a high modulus and excellent productivity can be provided. Drawings Fig. 1 is a cross-sectional view of an embodiment of a tire of the present disclosure. Detailed Description The present disclosure is described in detail below based on embodiments. In the followin