Rubber Composition for Tires with Silica and Silane Coupling Agent
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Solution Overview
Problem
Current rubber compositions for tires, particularly those using cyclopentene ring-opening polymers, are insufficient in abrasion resistance and low heat buildup properties, especially at low slip ratios, which are critical for vehicle safety and performance.
Innovation Solution
A rubber composition combining end modified group-containing cycloolefin ring-opening polymers with glass transition temperatures between -120°C and -90°C and end modified group-containing solution polymerized conjugated diene polymers with aromatic vinyl monomer units content between 30 wt% and 50 wt%, along with silica and a silane coupling agent containing a monosulfide or thiol group, to enhance abrasion resistance and low heat buildup properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If cyclopentene ring-opening polymer is used as alternative material to butadiene rubber, then production volume reduction of butadiene is addressed, but abrasion resistance and low heat buildup property are insufficient
Solution Approach 1:
The patent combines cyclopentene ring-opening polymer with specific inorganic particles (silica, alumina, or magnesium oxide) having surface hydroxyl groups, creating a composite rubber material that maintains the desired alternative to butadiene while achieving improved abrasion resistance and low heat buildup properties through the synergistic interaction between the polymer and inorganic particles
Solution Approach 2:
The patent specifies precise parameter ranges for the inorganic particles (surface hydroxyl group content of 0.5-5.0 mmol/g, particle size distribution, and specific surface area) to optimize the balance between abrasion resistance and heat buildup properties, transforming the insufficient performance into excellent performance by controlling these critical parameters
2Strength
If end modified group-containing cyclopentene ring-opening polymer is used to improve affinity with inorganic particle, then affinity is enhanced, but abrasion resistance in low slip ratio region remains insufficient
Solution Approach 1:
The patent precisely controls the surface hydroxyl group content of inorganic particles within 0.5-5.0 mmol/g and specifies the end modified group content on the polymer chain, optimizing these parameters to achieve both sufficient affinity and excellent abrasion resistance in low slip ratio conditions
Solution Approach 2:
The patent introduces end modified groups at specific locations (chain ends) of the cyclopentene ring-opening polymer rather than throughout the entire chain, creating localized affinity zones that bond with inorganic particles while preserving the bulk mechanical properties and abrasion resistance of the polymer matrix
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 excellent abrasion resistance and low heat buildup properties, particularly at low slip ratios, improving tire performance and safety by balancing mechanical properties and thermal management.
Implementation Method 1
a silane coupling agent including a monosulfide group and/or a thiol group
Implementation Method 2
cross-linking a rubber composition which is obtained by using an end modified group-containing cycloolefin ring-opening polymer
Implementation Method 3
having a glass transition temperature of -120 to -90°C and 45 to 85 wt% of an end modified group-containing solution polymerized conjugated diene polymer having a glass transition temperature of -60 to -10°C
Data Source
AI summary
Provided is a rubber composition for a tire containing a rubber component including 15 to 55 wt% of an end modified group-containing cycloolefin ring-opening polymer having a glass transition temperature of -120 to -90°C and 45 to 85 wt% of an end modified group-containing solution polymerized conjugated diene polymer having a glass transition temperature of -60 to -10°C and having an aromatic vinyl monomer unit content ratio of more than 30 wt% and 50 wt% or less, a silica, and a silane coupling agent including a monosulfide group and/or a thiol group, wherein the content of the silica with respect to 100 parts by weight of the rubber component is 30 to 200 parts by weight, and the content of the silane coupling agent including a monosulfide group and/or a thiol group with respect to 100 parts by weight of the silica is 0.3 to 20 parts by weight.