Pneumatic Tire Tread Bonding Sulfur Migration
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Solution Overview
Problem
Pneumatic tires often exhibit poor bonding surfaces between the tread and adjacent wing or sidewall due to sulfur migration during vulcanization, leading to reduced initial grip performance and peel-off issues.
Innovation Solution
Adjusting the net sulfur content from crosslinking agents in the rubber compositions for the tread and wing/sidewall within specific ranges and maintaining a specific relationship between them to enhance adhesion strength and bonding surface quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If sulfur content in rubber compositions is increased to improve crosslinking and adhesion, then adhesion strength between tread and wing/sidewall improves, but sulfur migration during vulcanization increases causing delayed initial crosslinking and poor bonding surface quality
Solution Approach 1:
The patent applies parameter changes by precisely controlling the sulfur content in the rubber compositions of the tread and wing/sidewall within specific ranges, and by adjusting the ratio between their sulfur contents. This optimization prevents excessive sulfur migration while ensuring adequate crosslinking, thereby resolving the contradiction between adhesion strength and bonding surface quality.
2Reliability
If individual rubber compositions are optimized for each component in laboratory tests, then component performance (abrasion resistance) is improved, but the finished tire exhibits poor bonding surfaces and thin film phenomena
Solution Approach 1:
The patent applies local quality by differentiating the sulfur content requirements for different components (tread vs. wing/sidewall). Instead of using a uniform composition approach, it specifically optimizes the sulfur content in each component's rubber composition and establishes a quantitative relationship between them, ensuring both component performance and bonding quality.
Solution Approach 2:
The patent changes the compositional parameters of the rubber compositions by specifying precise sulfur content ranges for different components and establishing a ratio relationship. This systematic parameter optimization resolves the contradiction between individual component performance and overall bonding quality.
3Manufacturing precision
If sulfur migration is prevented by reducing sulfur content, then bonding surface quality improves, but adhesion strength and crosslinking performance deteriorate
Solution Approach 1:
The patent resolves this contradiction through parameter optimization by finding the precise balance point where sulfur content is sufficient for strong adhesion but controlled enough to prevent excessive migration. The specified sulfur content ranges and their ratio relationship achieve this optimal balance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution results in a pneumatic tire with an excellent finished bonding surface, maintaining required performance such as abrasion resistance and resistance to degradation over time, while preventing the thin film phenomenon and peel-off failures.
Implementation Method 1
sulfur migrates between tire components during vulcanization, and the migration of sulfur causes a delay in initial crosslinking
Data Source
Figure 1(a)~1(d)
Figure 2(a)~2(d)
Figure 3(a)~3(b)
AI summary
The present invention provides a pneumatic tire having an excellent finished bonding surface between the tread and its adjacent wing or sidewall while maintaining required performance of a tire such as abrasion resistance and resistance to degradation over time. The present invention relates to a pneumatic tire including a tread and a wing or sidewall adj acent to the tread, wherein the tread is formed from a rubber composition for a tread which has a specific net sulfur content derived from crosslinking agents; the wing or sidewall is formed from a rubber composition for a wing or sidewall which has a specific net sulfur content derived from crosslinking agents; and a specific relationship is satisfied between the net sulfur content derived from crosslinking agents in the rubber composition for a tread and the net sulfur content derived from crosslinking agents in the rubber composition for a wing or sidewall.