Rubber Modifier Compound for Filler Affinity and Wet Grip Balance
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Solution Overview
Problem
Existing rubber materials for tires, such as SBR and BR, face challenges in achieving high affinity with fillers, which affects their performance in terms of wet road surface resistance and hysteresis loss.
Innovation Solution
A novel compound represented by Chemical Formula 1, which is used to modify rubber polymers, particularly those derived from conjugated diene-based monomers, is synthesized through a reaction of specific alkylene and alkyl groups under basic conditions, enhancing the affinity with fillers by providing multiple coupling sites and strong bonds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rubber materials (SBR, BR) are used, then processing and tire manufacturing are straightforward, but affinity with fillers is insufficient leading to poor wet road surface resistance
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of rubber polymers through controlled reaction with diisocyanate compounds. Specifically, the vinyl structure content is adjusted to 20-40% and hydroxyl group content to 0.5-5 mmol/kg, transforming the polymer properties to enhance filler affinity while maintaining processability
Solution Approach 2:
The patent creates composite material characteristics by introducing hydroxyl groups into the rubber polymer chain, forming a hybrid structure that combines the elasticity of rubber with the bonding capability of hydroxyl-functionalized polymers. This composite structure enables strong interaction with metal oxide fillers like silica
2Reliability
If vinyl structure content is increased to improve filler affinity, then wet road surface resistance improves, but hysteresis loss increases reducing fuel efficiency
Solution Approach 1:
The patent precisely controls the vinyl structure content within 20-40% and hydroxyl group content within 0.5-5 mmol/kg through controlled reaction conditions. This parameter optimization achieves the dual benefit of improved filler affinity for wet road resistance while limiting hysteresis loss to maintain fuel efficiency
Solution Approach 2:
The patent applies local quality by introducing hydroxyl groups at specific locations along the polymer chain rather than uniformly throughout. This localized modification at chain ends and specific segments provides filler bonding sites without extensively increasing crosslinking that would raise hysteresis loss
3Reliability
If chain end modification is performed to improve filler bonding, then affinity with filler increases, but modification process complexity increases
Solution Approach 1:
The patent uses diisocyanate compounds as intermediary reagents that first react with hydroxyl groups on the polymer chain to form carbamate linkages. This intermediary reaction step creates a bridge between the rubber polymer and subsequent filler bonding, simplifying the overall modification process while achieving strong filler adhesion
Solution Approach 2:
The patent performs preliminary action by pre-introducing hydroxyl groups into the polymer chain during the modification step before filler addition. This preliminary functionalization ensures that bonding sites are already prepared and distributed uniformly, eliminating the need for complex in-situ modification during mixing with fillers
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 modified rubber polymers exhibit a high modification rate and improved affinity with fillers, resulting in enhanced tire performance with balanced running resistance and wet road surface resistance.
Implementation Method 1
a novel compound capable of highly modifying rubber... a compound represented by Chemical Formula 1... reacting a compound represented by Chemical Formula 2 with a compound represented by Chemical Formula 3
Implementation Method 2
increasing an affinity between rubber and filler... providing multiple coupling sites and strong bonds
Data Source
AI summary
The present invention provides a novel compound, which is a modifier material useful for modifying rubber, especially a polymer including a repeating unit derived from a conjugated diene-based monomer, and a method for producing the same.