Tire Rubber Composition Balancing Aging Resistance and Strength
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Solution Overview
Problem
Existing rubber compositions used in tires face challenges with poor aging resistance due to high unsaturation in diene elastomers, which also compromises mechanical strength when combined with highly saturated rubbers.
Innovation Solution
A rubber composition is developed that includes a rubber matrix comprising 5-95 parts by weight of branched polyethylene, 5-90 parts by weight of highly unsaturated diene elastomer, and 0-30 parts by weight of low unsaturated diene elastomer, along with a vulcanization system and filler as compounding components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If highly unsaturated diene elastomers are used to improve mechanical strength, then tensile strength and elasticity are enhanced, but aging resistance deteriorates due to high carbon-carbon double bond content
Solution Approach 1:
The patent creates a composite rubber material combining highly unsaturated diene elastomer (for mechanical strength) with highly saturated rubber such as ethylene-propylene rubber or halogenated butyl rubber (for aging resistance). This composite approach allows both requirements to be satisfied simultaneously by leveraging the complementary properties of different rubber types.
Solution Approach 2:
The patent changes the saturation parameter of the rubber composition by introducing highly saturated rubber components with saturation degrees exceeding 90%, thereby reducing the overall unsaturation level of the composite material while maintaining mechanical performance through optimized formulation ratios.
2Reliability
If highly saturated rubber is combined with highly unsaturated diene rubber to improve aging resistance, then oxidation resistance is enhanced, but mechanical strength deteriorates due to lower strength of saturated rubber components
Solution Approach 1:
The patent formulates a composite rubber composition where highly saturated rubber (providing aging resistance) is combined with highly unsaturated diene rubber (providing mechanical strength). The synergistic effect of this composite allows the final material to achieve both improved aging resistance and maintained mechanical strength, overcoming the limitations of individual components.
Solution Approach 2:
The patent optimizes the saturation degree parameter of the rubber composition by carefully controlling the ratio and selection of rubber components, achieving a balanced formulation where the highly saturated rubber content is sufficient to provide aging resistance but not so high as to compromise mechanical strength.
3Ease of manufacture
If conventional rubber compositions are used to reduce manufacturing cost, then production expense is lowered, but aging resistance and mechanical properties deteriorate
Solution Approach 1:
The patent develops a cost-effective composite rubber formulation that combines conventional rubber types with highly saturated rubber components. This composite approach achieves improved aging resistance and mechanical properties without excessive cost increase, as the formulation uses commercially available rubber types in optimized proportions.
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 proposed rubber composition achieves improved aging resistance and mechanical properties, enhancing compression set resistance, reducing rolling resistance, and contributing to energy-saving and environmentally friendly tire performance.
Implementation Method 1
a rubber matrix comprising 5-95 parts by weight of a branched polyethylene, 5-90 parts by weight of a highly unsaturated diene elastomer
Implementation Method 2
The compounding component includes a vulcanization system
Implementation Method 3
The compounding component includes a filler
Implementation Method 4
the branching degree of the branched polyethylene...is not lower than 50 branches/1,000 carbons...improved aging resistance
Data Source
AI summary
Disclosed is a rubber composition and a tire using the same. The rubber composition comprises a rubber matrix and a compounding component. In parts by weight, every 100 parts by weight of said rubber matrix comprises 5-95 parts by weight of a branched polyethylene, 5-90 parts by weight of a highly unsaturated diene elastomer and 0-30 parts by weight of a low unsaturated diene elastomer; and said compounding component comprises a vulcanization system and a filler. The rubber composition has good aging resistance and mechanical properties, and can be applied for products such as tires, rubber hoses, rubber tapes and so on, in which the traditional, easily aging diene rubber was commonly used.