Styrene-Butadiene Rubber Composition for Tire Wear and Processability
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Solution Overview
Problem
Current rubber compositions for pneumatic tires face challenges in achieving both high wear resistance and processability, as existing formulations often compromise on rubber strength and wet skid characteristics when trying to enhance these properties.
Innovation Solution
A rubber composition incorporating a diene rubber with a styrene-butadiene copolymer and a reinforcing filler, where the styrene-butadiene copolymer has specific characteristics such as a bonded styrene content of 5-50 wt.%, a decomposed component V1 content of at least 20 mol%, a decomposed component S2V1 content of at least 4 mol%, and a vinyl content of 20-50% in the butadiene moiety, improving both wear resistance and processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a polybutadiene or silica having high reactivity is blended to enhance wear resistance and rubber hardness, then wear resistance is improved, but rubber strength decreases and workability is diminished
Solution Approach 1:
The invention changes the chemical structure parameters of the styrene-butadiene copolymer by controlling the vinyl content (20-50%) and the specific sequence distribution of styrene units (using 13C NMR to measure triad sequences). This parameter optimization allows the rubber to achieve high wear resistance while maintaining good workability and rubber strength, resolving the contradiction between enhanced durability and manufacturing ease.
2Reliability
If a styrene-butadiene copolymer with specific array of styrene units and silica is blended to satisfy wet skid resistance and rolling resistance, then these properties are improved, but wear resistance and processability are not sufficiently enhanced
Solution Approach 1:
The invention applies local quality by specifically controlling the microstructure at different levels: the overall vinyl content (20-50%), the triad sequence distribution (mm, sm, ss ratios), and the bonded styrene content (5-50 wt%). This multi-level structural control ensures that specific regions of the polymer chain have properties optimized for wear resistance while maintaining overall processability and wet skid resistance.
Solution Approach 2:
The invention creates a composite material system by blending the specifically structured styrene-butadiene copolymer with silica reinforcing filler. The copolymer's controlled microstructure (vinyl content 20-50%, specific triad sequences) synergizes with silica to achieve simultaneous improvement in wear resistance, processability, wet skid resistance, and rolling resistance, overcoming the limitations of previous single-component or less-optimized formulations.
3Strength
If the bonded styrene content is increased to enhance wear resistance, then wear resistance improves, but processability deteriorates
Solution Approach 1:
The invention optimizes the bonded styrene content parameter within the specific range of 5-50 wt%, rather than using high levels that would improve wear resistance but harm processability. This balanced parameter selection, combined with controlled vinyl content (20-50%) and specific triad sequence distribution, achieves sufficient wear resistance while maintaining excellent processability for tire manufacturing.
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 composition enhances wear resistance and processability to beyond known levels, enabling the production of high-quality tires with improved productivity and balanced viscoelastic characteristics.
Implementation Method 1
among components obtained by ozone decomposition, a content of a decomposed component V1 containing one 1,2-bonded butadiene-derived unit out of a total of 100 mol % of decomposed components containing styrene-derived units and/or 1,2-bonded butadiene-derived units is not less than 20 mol %
Data Source
AI summary
Provided is a rubber composition which contains a diene rubber and a reinforcing filler. The diene rubber contains a styrene-butadiene copolymer component including at least one type of styrene-butadiene copolymer and satisfying: (1) the bonded styrene content is from 5 to 50 wt. %; (2) among components obtained by ozone decomposition, the content of a decomposed component V1 containing one 1,2-bonded butadiene-derived unit out of the total of 100 mol % of decomposed components containing styrene-derived units and/or 1,2-bonded butadiene-derived units is not less than 20 mol %; (3) among components obtained by ozone decomposition, the content of a decomposed component S2V1 containing two styrene-derived units and one 1,2-bonded butadiene-derived unit out of the total of 100 mol % of decomposed components containing styrene-derived units and/or 1,2-bonded butadiene-derived units is not less than 4 mol %; and (4) the vinyl content of a butadiene moiety is not less than 20% and less than 50%.