Sulfide Coupling Agent for Rubber Carbon Black
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Solution Overview
Problem
Current coupling agents for rubber/carbon black in tires fail to achieve satisfactory reduction in rolling resistance while maintaining adequate wet grip, which is essential for improving fuel economy and driving safety.
Innovation Solution
A sulfide compound with condensed aromatic heterocyclic rings is used as a coupling agent, forming π-electron interactions with carbon black surfaces, in addition to acid-base interactions, to enhance dispersibility and bonding, thereby reducing rolling resistance while preserving wet grip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional coupling agents (amino group-containing compounds) are used to improve carbon black dispersibility and bonding, then wet grip is maintained, but rolling resistance reduction is insufficient
Solution Approach 1:
The patent changes the chemical structure parameters of the coupling agent by introducing condensed aromatic heterocyclic rings with π-electrons, transforming the interaction mechanism from simple acid-base interaction to dual π-electron and acid-base interaction, thereby achieving superior rolling resistance reduction while maintaining wet grip
Solution Approach 2:
The coupling agent combines multiple functional groups (amino groups for acid-base interaction and condensed aromatic heterocyclic rings for π-electron interaction) into a single molecular structure, creating a composite coupling mechanism that simultaneously achieves both wet grip maintenance and rolling resistance reduction
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 use of this sulfide compound in rubber compositions results in tires with improved fuel economy and reduced rolling resistance while maintaining excellent wet grip performance.
Implementation Method 1
the sulfide compound represented by the chemical formula (I) has condensed aromatic heterocyclic rings in its molecule, and it therefore forms bonding through the π-electron interaction with benzene rings on the carbon black surface
Implementation Method 2
the acid-base interaction between carbonyl and carboxyl groups present on the carbon black surface and the amino groups has been expected to produce a bonding effect
Data Source
AI summary
The present invention relates to a coupling agent for rubber/carbon black, containing a sulfide compound represented by the following chemical formula (I): [Chem. 1] (in the formula, each A represents O, S, NH or NR; each R represents a linear or branched alkyl or alkenyl group having 1 to 6 carbon atoms, or a cyclic alkyl or alkenyl group having 3 to 6 carbon atoms, and when A is NR, the plurality of R's on a condensed aromatic heterocyclic ring may be the same as or different from each other; n represents an integer from 1 to 6; and x represents an integer from 1 to 4).