Sulfur-Curable Tire Rubber Compound Balancing Wear and Rolling Loss
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Solution Overview
Problem
Existing rubber mixtures for tires face challenges in balancing abrasion behavior, reinforcing effect, and rolling resistance, with silica-based compounds often compromising on one property to improve another, particularly when natural rubber is the main polymer component.
Innovation Solution
A sulfur-crosslinkable rubber mixture comprising styrene butadiene rubber, butadiene rubber, and finely divided silica, combined with specific silanes that optimize abrasion and reinforcing effects without significantly impacting rolling resistance, suitable for various tire components and technical rubber items.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If silica is used to replace carbon black in rubber mixtures, then rolling resistance behavior is improved, but abrasion behavior deteriorates
Solution Approach 1:
The patent modifies the silane coupling agent parameters by using specific organosilanes with controlled molecular structures (bis(triethoxysilylpropyl) disulfide or tetrasulfide) and precise dosages (2-10 phr) to optimize the silica-rubber interface, thereby improving abrasion resistance while preserving the low rolling resistance benefit of silica
Solution Approach 2:
The patent creates a composite system combining silica filler, specific organosilane coupling agents, and rubber polymer matrix, where the silane forms a bridging layer that enhances the interfacial bonding between hydrophobic rubber and hydrophilic silica, simultaneously improving mechanical properties and energy loss characteristics
2Strength
If high specific surface area silica is used, then reinforcing effect is improved, but dispersibility in rubber mixture deteriorates
Solution Approach 1:
The patent introduces organosilane coupling agents as intermediary substances that chemically bond to both the silica surface and the rubber polymer chains, facilitating the dispersion of high surface area silica particles throughout the rubber matrix while maintaining strong reinforcing effects
3Loss of energy
If monomeric silanes are used, then rolling resistance behavior is improved, but processability and wet grip behavior deteriorate
Solution Approach 1:
The patent optimizes the molecular structure parameters of the silane coupling agent by selecting specific chain lengths and sulfur content in polysulfidic organosilanes, creating a balance between flexibility (for processability) and performance (for rolling resistance and wet grip)
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 enhances abrasion resistance and reinforcing properties while maintaining good handling characteristics and rolling resistance, making it suitable for diverse tire applications and technical rubber products.
Implementation Method 1
organosilanes are used to make the silicic acid hydrophobic and thus create the connection between the filler and the polymer
Implementation Method 2
sulfur cross-links the polymer chains of the butadiene rubber and/or the styrene butadiene rubber with one another in a vulcanization step
Data Source
AI summary
The invention relates to a sulfur-curable rubber compound, a vulcanizate, and a vehicle tire. The sulfur-curable rubber compound contains at least the following components: - at least one styrene-butadiene rubber or at least one butadiene rubber, and - at least one silica, and - at least one silane B with the general formula I) or II) I) (R1)oSi-(R2-)mAC(R32)-X II) (R1)oSi-(R4-)kC(R3X)-A, where A is an aromatic group; and where X is selected from halide, tosylate, mesylate, and trifluoromethanesulfonate groups.