Sulfur-Linkable Rubber Coating Mixture for Tire Reinforcement
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Solution Overview
Problem
Current rubber mixtures for tire reinforcement struggle to balance fatigue resistance with low rolling resistance, while maintaining strong adhesion to textile reinforcements under dynamic and thermal loads.
Innovation Solution
A sulfur-crosslinkable rubber mixture comprising 25-55 phr polyisoprene, 45-75 phr diene elastomer, 30-90 phr silica, a silane coupling agent, and an adhesive system, optimized with specific components like cis-1,4-polyisoprene, styrene-butadiene copolymers, and silica with low CTAB surface area, to enhance fatigue resistance and reduce rolling resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If silica is used instead of carbon black as a filler to reduce rolling resistance, then rolling resistance decreases, but adhesion to textile reinforcement deteriorates
Solution Approach 1:
The patent introduces a silane coupling agent as an intermediary substance between silica and the rubber matrix. This coupling agent contains both silane groups that bond with silica surface hydroxyl groups and organic functional groups that interact with the rubber polymer chains, thereby maintaining adhesion performance while using silica filler
Solution Approach 2:
The patent creates a composite material system combining silica, silane coupling agent, and rubber components. The silane coupling agent forms a bridge between the inorganic silica filler and the organic rubber matrix, creating an effective composite structure that maintains both low rolling resistance and strong adhesion
2Reliability
If polybutadiene content is increased to improve adhesion, then adhesion improves, but fatigue resistance deteriorates
Solution Approach 1:
The patent optimizes the compositional parameters by limiting polybutadiene to a maximum of 40 parts by weight and specifying polyisoprene content between 10-40 parts by weight. This parameter optimization balances the adhesive properties provided by polybutadiene with the fatigue resistance provided by polyisoprene and silica
3Reliability
If sulfur crosslinking is used to improve adhesion durability, then adhesion durability improves, but rolling resistance increases
Solution Approach 1:
The patent optimizes the sulfur content parameter, specifying it should be between 0.1-5 parts by weight. This controlled sulfur dosage provides sufficient crosslinking for adhesion durability while minimizing the hysteresis loss that would increase rolling resistance
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 rubber mixture achieves significant improvement in fatigue resistance and maintains low rolling resistance, ensuring durable adhesion to textile reinforcements, thereby extending the service life of tires with improved durability and reduced fuel consumption.
Implementation Method 1
at least one silane coupling agent
Implementation Method 2
an adhesive system for rubber-textile adhesion
Implementation Method 3
sulfur-crosslinkable rubber mixture
Data Source
AI summary
The invention relates to a sulfur-crosslinkable rubber compound for textile reinforcement, comprising at least one polyisoprene, at least one further diene elastomer consisting of at least one conjugated diene and optionally one or more vinylaromatic compounds with a vinylaromatic compound content of 0 to 50 wt.%, at least one silica, at least one silane coupling agent, and an adhesion system. The invention further relates to a vehicle tire comprising at least one such sulfur-crosslinked rubber compound. For improved fatigue resistance combined with low rolling resistance when used in the tire, the rubber compound contains: - 25 to 55 phr at least one polyisoprene, - 45 to 75 phr at least one further diene elastomer consisting of at least one conjugated diene and optionally one or more vinylaromatic compounds with a vinylaromatic compound content of 0 to 50 wt.%.-%, - 30 to 90 phr of at least one silica, - at least one silane coupling agent and - an adhesion system for rubber-textile adhesion.