Tire Sidewall Ozone Protection via Segmented Rubber Sheet
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Solution Overview
Problem
Conventional rubber compositions for tire sidewalls face challenges in maintaining ozone resistance, heat resistance, and weatherability while avoiding discoloration caused by amine-based anti-aging agents, which are deposited on the surface over time.
Innovation Solution
A rubber composition is introduced, comprising 100 parts of base rubber, 20 to 60 parts of carbon black, and 2 to 5 parts of an amine-based anti-aging agent, along with 1 to 3 parts of a quinoline-based anti-aging agent, specifically designed to be used in the form of a sheet between the tire sidewall and carcass, minimizing the use of amine-based anti-aging agents on the sidewall to prevent discoloration while enhancing ozone and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an amine-based anti-aging agent is added to rubber composition for sidewall protection, then ozone resistance and weatherability are improved, but discoloration of the rubber surface occurs over time
Solution Approach 1:
A protective layer comprising a rubber composition with amine-based anti-aging agent is introduced as an intermediary between the sidewall rubber and the external environment. This protective layer contains the anti-aging agent that migrates to protect the sidewall from ozone and weathering, while the sidewall rubber itself contains little or no anti-aging agent, preventing discoloration. The protective layer acts as a mediator that provides the necessary protection without causing aesthetic degradation.
Solution Approach 2:
The tire sidewall structure is segmented into two distinct rubber compositions: the sidewall rubber itself and a separate protective layer. The protective layer is specifically formulated with amine-based anti-aging agents to provide ozone and weather resistance, while the sidewall rubber contains minimal or no anti-aging agent to maintain appearance. This segmentation allows each layer to perform its specific function without compromise.
2Object-affected harmful factors
If a great amount of wax is mixed instead of anti-aging agent, then appearance deterioration is prevented, but ozone resistance and heat resistance deteriorate
Solution Approach 1:
The protective layer serves as an intermediary that provides the necessary anti-aging protection through amine-based agents, while the sidewall rubber maintains its appearance by containing little or no anti-aging agent. The protective layer is specifically designed to provide ozone and heat resistance without compromising the aesthetic appearance of the sidewall.
3Object-affected harmful factors
If amine-based anti-aging agent or wax is not mixed in sidewall rubber, then appearance is maintained, but essential physical properties such as weatherability and heat resistance are seriously deteriorated
Solution Approach 1:
The protective layer comprising rubber composition with amine-based anti-aging agent acts as an intermediary that provides essential weatherability, ozone resistance, and heat resistance. The sidewall rubber itself maintains its appearance by containing little or no anti-aging agent, while the protective layer compensates for the lack of protective additives in the sidewall rubber.
Solution Approach 2:
The tire sidewall is segmented into sidewall rubber for appearance and a protective layer for performance. The protective layer is specifically formulated with anti-aging agents and other additives to provide weatherability, ozone resistance, and heat resistance, while the sidewall rubber focuses on maintaining aesthetic appearance.
Data Source
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AI summary
Disclosed is a rubber composition for protecting a sidewall of a tire from ozone and a tire manufactured using the same. More specifically, disclosed is a tire including a rubber sheet for preventing aging between a sidewall and a carcass, wherein the rubber sheet for preventing aging includes a rubber composition including 100 parts by weight of a base rubber, 20 to 60 parts by weight of carbon black, and 2 to 5 parts by weight of an amine-based anti-aging agent. The tire produced from the rubber composition according to the present invention has an effect of exhibiting significantly improved ozone resistance without changing a degree of blackness in terms of appearance.