Modified Diene Polymer Silica Dispersion
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Solution Overview
Problem
The poor dispersibility of silica in rubber compositions for tires hinders the simultaneous achievement of reduced rolling resistance and improved stability on wet road surfaces, as existing methods do not effectively utilize silica's full potential.
Innovation Solution
A modified diene-based polymer is developed by graft-modifying a diene-based polymer with a polyether containing a mercapto group via diurethane bonding, enhancing silica dispersibility and interaction within the rubber composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silica is compounded into a rubber composition for tires, then rolling resistance reduction and wet road stability are improved, but silica dispersibility deteriorates
Solution Approach 1:
The patent introduces a silane-modified polybutadiene as an intermediary substance that facilitates interaction between silica and the rubber matrix. The silane groups on the polybutadiene form chemical bonds with silica surfaces, acting as a bridge that improves silica dispersibility while maintaining the functional benefits of silica for rolling resistance and wet road stability
Solution Approach 2:
The patent creates a composite material system consisting of silane-modified polybutadiene, silica, and other rubber components. This composite approach allows the synergistic combination of materials where the modified polymer provides both structural matrix functions and silica coupling functions, resolving the dispersibility issue while preserving performance benefits
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 polymer significantly improves silica dispersibility, allowing for effective reduction of rolling resistance and enhanced stability on wet road surfaces in automobile pneumatic tires.
Implementation Method 1
a diene based polymer which has been graft-modified with a polyether having a mercapto group attached via diurethane bonding
Implementation Method 2
the dispersibility of silica compounded in the rubber composition can be improved
Data Source
AI summary
Provided is a modified diene based polymer in which a diene based polymer is graft modified with a polyether having a mercapto group attached via diurethane bonding. Formation of diurethane bonding is performed by allowing sequential reactions of two species of hydroxyl group-containing compounds with an diisocyanate compound. By adding the modified diene based polymer to a silica-containing rubber composition for automobile pneumatic tires, the dispersibility of silica compounded in the rubber composition can be improved, and a property inherent in silica which simultaneously allows a reduction of rolling resistance and a stability on wet road surfaces can be sufficiently effected.