Pneumatic Tire Rubber Composition with Dual Crosslinking for Crack Resistance
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Solution Overview
Problem
Existing pneumatic tires have insufficient tire crack resistance, which is a concern for both low fuel consumption and durability.
Innovation Solution
A pneumatic tire comprising a rubber composition with a polymer containing polar functional groups, a metal compound with a divalent metal ion, a filler, and sulfur, where the polymer is predominantly acrylonitrile-butadiene rubber or hydrogenated acrylonitrile-butadiene rubber, and the metal compound is a sulfate or hydrate, forming covalent and ionic crosslinking bonds to enhance crack resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional rubber compositions are used to achieve low fuel consumption, then fuel efficiency improves, but tire crack resistance deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters by introducing a polymer with polar functional groups (nitrile or pyridyl) and using specific metal compounds (divalent metal ions like Cu2+, Zn2+, Mg2+) in controlled amounts (7-25 parts by mass per 100 parts rubber component). This parameter change enables the formation of ionic crosslinking bonds that improve crack resistance while maintaining the low fuel consumption characteristics.
Solution Approach 2:
The invention creates a composite rubber composition by combining the polymer with polar functional groups, metal compounds, fillers, and sulfur. The interaction between these components forms both covalent crosslinking bonds (from sulfur vulcanization) and ionic crosslinking bonds (from metal-polar group interactions), creating a composite network structure that simultaneously achieves low fuel consumption and high crack resistance.
2Strength
If adhesive rubber layers are used to improve bond strength, then bonding performance improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The rubber composition itself is designed to perform multiple functions: it provides the base rubber matrix, enables low fuel consumption through specific polymer selection, achieves high crack resistance via ionic and covalent crosslinking, and provides adequate bond strength without requiring separate adhesive layers. This multi-functionality eliminates the need for additional adhesive rubber layers, simplifying the tire structure.
3Ease of manufacture
If sulfur crosslinking is used for cost-effectiveness, then manufacturing cost decreases, but crosslinking speed may be limited
Solution Approach 1:
The invention employs sulfur vulcanization in combination with metal compound-mediated ionic crosslinking. The sulfur provides continuous covalent crosslinking throughout the rubber matrix, while the metal compounds facilitate additional crosslinking pathways. This continuous dual crosslinking mechanism maintains cost-effectiveness while enhancing the overall crosslinking rate and network formation efficiency.
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 tire achieves excellent crack resistance while maintaining low fuel consumption and abrasion resistance, with rapid and cost-effective crosslinking using sulfur, improving durability without the need for an adhesive rubber layer.
Implementation Method 1
forming covalent and ionic crosslinking bonds to enhance crack resistance
Implementation Method 2
forming covalent and ionic crosslinking bonds to enhance crack resistance
Data Source
AI summary
Disclosed are a pneumatic tire having excellent crack resistance and a rubber composition capable of obtaining the tire, containing a rubber component containing a polymer having at least one polar functional group selected from the group consisting of a nitrile group and a pyridyl group; a metal compound containing a divalent metal ion in an amount of 7 to 25 parts by mass relative to 100 parts by mass of the rubber component; a filler; and sulfur.