Search

CN-121989592-A - Tyre with interlayer reinforcing layer of tyre side

CN121989592ACN 121989592 ACN121989592 ACN 121989592ACN-121989592-A

Abstract

The invention relates to the technical field of tire manufacturing, and discloses a tire provided with a reinforcing layer between sidewall layers, wherein the tire comprises a tread and a sidewall, the sidewall comprises an outer coating layer and a sidewall matrix rubber, an interlayer reinforcing layer which adopts an ethylene-styrene-butadiene thermoplastic elastomer ESB layer film is arranged between the outer side coating of the tire side and the tire side matrix rubber. On the premise of not changing the formula of the side body, the interlayer bonding and bending durability of the side under the condition of 70 ℃ are effectively improved through the ESB layer film, and the side wall is suitable for co-extrusion/co-calendaring/heat bonding and conventional vulcanization processes, and has good mass production feasibility and robustness.

Inventors

  • WANG DANLING
  • NI BAO
  • LU XIAOQI
  • ZHANG JIANJUN
  • HUANG DAYE

Assignees

  • 中策橡胶集团股份有限公司
  • 杭州海潮橡胶有限公司

Dates

Publication Date
20260508
Application Date
20260312

Claims (9)

  1. 1. Tyre provided with an interlayer reinforcing layer of a sidewall, comprising a tread and a sidewall, the sidewall of which comprises an outer cladding and a sidewall matrix rubber, characterized in that, an interlayer reinforcing layer of an ethylene-styrene-butadiene thermoplastic elastomer ESB layer film is arranged between the outer cladding of the sidewall and the sidewall matrix rubber, and the ESB layer film satisfies: a) The thickness is 0.05-0.30mm; b) Is composed of hydrogenated styrene-ethylene/butadiene block copolymer, the hydrogenation rate is more than or equal to 80 percent, the content of styrene hard segment is 20 to 35 weight percent, and the Tg of hard phase is more than or equal to 95 ℃.
  2. 2. Tyre provided with a reinforcing layer between sidewalls according to claim 1, characterized in that the ESB is grafted with maleic anhydride, preferably in an amount of 0.1-1.0% by weight.
  3. 3. Tyre provided with a reinforcing layer between sidewalls according to claim 1, characterized in that said ESB layer film contains a lamellar barrier filler in an amount of 0.05-0.50 parts by weight, calculated as 100 parts by weight of ESB, preferably said lamellar barrier filler having a lamellar aspect ratio of not less than 100.
  4. 4. A tyre provided with a reinforcing layer between sidewalls according to claim 3, characterized in that said platy barrier filler is selected from exfoliated graphene, layered silicate or a composite thereof.
  5. 5. A tyre provided with a reinforcing layer between sidewalls according to claim 3, characterized in that said sheet-like barrier filler has an in-plane orientation degree f greater than or equal to 0.70 during the formation of the ESB layer.
  6. 6. Tyre provided with a reinforcing layer between sidewalls according to claim 1, characterized in that said outer coating layer has a thickness of 0.8-2.0mm and said sidewall base stock has a thickness of 2-4mm.
  7. 7. Tyre provided with a reinforcing layer between sidewalls according to any one of claims 1 to 6, characterized in that the process for preparing the sidewalls comprises the steps of placing the ESB ply film between the outer side cover of the sidewall and the base rubber of the sidewall, forming a laminate of sandwich structure by coextrusion, co-calendering or thermal lamination, and vulcanizing the laminate.
  8. 8. The tire provided with a sidewall reinforcing layer according to claim 7, wherein said ESB film surface is corona or plasma activated to promote wetting and adhesion.
  9. 9. Tyre provided with a reinforcing layer between sidewalls according to claim 7, characterized in that said ESB layer film has added thereto a sheet-like barrier filler, exerting a traction ratio on the laminate of 1.1-1.6.

Description

Tyre with interlayer reinforcing layer of tyre side Technical Field The invention relates to the technical field of tire manufacturing, in particular to a tire provided with a tire side interlayer reinforcing layer. Background The sidewall is subjected to continuous bending and shearing cycles during running of the vehicle and is in a comprehensive environment of hot oxygen, ultraviolet, damp heat, ozone and road debris impact. To improve the ability of the sidewall to withstand sustained bending and shear cycles, a high carbon black rubber appearance layer is typically employed, or a tie-gum (e.g., EPDM/NR, NR/BR) transition layer is employed, or a coating of that resin film plus primer/specialty tie layer is employed. However, the rubber appearance layer with high carbon black content has significantly reduced storage modulus E' at high temperature (70-90 ℃) to cause concentrated interlayer shearing and easy induction of interface fatigue over time, the interlayer peeling force of the traditional rubber-gum is significantly reduced at 70 ℃, the rubber appearance layer peels along the interface after heat circulation, the resin coating scheme depends on specific adhesive copolymer or primer coating, and the process window is narrow and the robustness is insufficient. Therefore, there is a need for a structure that maintains a high storage modulus, interlayer bond strength at 70 ℃ without changing the sidewall body formulation. Disclosure of Invention The invention aims at the defects of the prior art and provides a tire provided with a reinforcing layer between side wall layers. In order to achieve the above purpose, the present invention adopts the following technical scheme: a tire provided with an interlayer reinforcing layer of a sidewall, the tire comprising a tread and a sidewall, the sidewall comprising an outer cladding and a sidewall base rubber, the outer cladding of the sidewall and the sidewall base rubber being provided with an interlayer reinforcing layer therebetween using an ethylene-styrene-butadiene thermoplastic Elastomer (ESB) layer film, the ESB layer film satisfying: a) The thickness is 0.05-0.30mm; b) Is composed of hydrogenated styrene-ethylene/butadiene block copolymer, the hydrogenation rate is more than or equal to 80 percent, the content of styrene hard segment is 20 to 35 weight percent, and the Tg of hard phase is more than or equal to 95 ℃. Preferably, the ESB is grafted with maleic anhydride, more preferably, the maleic anhydride grafting amount is 0.1 to 1.0wt%. Preferably, the ESB layer film contains a flaky separation filler, wherein the adding amount of the flaky separation filler is 0.05-0.50 parts by weight based on 100 parts by weight of ESB, and more preferably, the flaky separation filler has a flaky length-diameter ratio of more than or equal to 100. Further, the platy barrier filler is selected from exfoliated graphene, layered silicate or a composite thereof. The ESB layer containing the sheet-shaped barrier filler has an in-plane orientation degree f of more than or equal to 0.70 in the sidewall forming process. Preferably, the thickness of the outer coating layer is 0.8-2.0mm, and the thickness of the sidewall base rubber is 2-4mm. Preferably, the preparation method of the side wall comprises the following steps of placing the ESB layer film between a side wall outer coating layer and a side wall base rubber, forming a laminated body with a sandwich structure through coextrusion, co-calendaring or thermal bonding, and vulcanizing the laminated body. Preferably, the ESB layer film surface is corona or plasma activated to promote wetting and adhesion. Preferably, the ESB layer film is added with a sheet-shaped barrier filler, and a traction ratio of 1.1-1.6 is applied to the laminated body. By adopting the scheme, on the premise of not changing the formula of the sidewall main body, interlayer bonding and bending durability of the sidewall under the condition of 70 ℃ are effectively improved through the ESB layer film, and the method is suitable for co-extrusion/co-calendaring/thermal bonding and conventional vulcanization processes, and has good mass production feasibility and robustness. Detailed Description The technical solutions in the embodiments are clearly and completely described below in connection with the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. Examples A tire has a three-layer laminate structure, and comprises an outer coating layer, an ESB layer film and a sidewall base rubber from outside to inside. The ESB layer has a film thickness of 0.15mm, is prepared by adopting H-SEBS, and has a maleic anhydride grafting amount of 0.5wt%