Siloxane-Modified Diene Rubber for Low-Heat, Non-Stick Processing
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Solution Overview
Problem
There is a need for a rubber composition that can prevent adhesion to rolls while providing a cross-linked rubber with low heat buildup, high wet grip, and high operation stability, which are not adequately met by conventional rubbers.
Innovation Solution
A modified conjugated diene rubber is developed, where a modifying structure derived from a siloxane compound is introduced to at least one end of a polymer chain containing conjugated diene monomer units and a vinyl compound with a functional group interactive with silica, excluding the use of a functionalizing lithium initiator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional rubbers are used in tire applications, then basic rubber properties are maintained, but adhesion to rolls occurs and heat buildup is high
Solution Approach 1:
The patent modifies the chemical structure of conjugated diene rubber by introducing a specific vinyl compound unit (formula 1) with functional groups that interact with silica, and incorporates siloxane compounds (formula 2) to alter surface properties. These parameter changes in molecular structure and composition prevent adhesion to rolls while reducing heat buildup through improved silica compatibility and energy dissipation mechanisms.
Solution Approach 2:
The invention creates a composite rubber system by combining modified conjugated diene rubber with silica filler and siloxane compounds. This composite structure leverages the synergistic effects of rubber elasticity, silica reinforcement, and siloxane surface modification to simultaneously prevent adhesion and reduce heat buildup, achieving properties superior to conventional homogeneous rubbers.
2Loss of energy
If silica is used as filler to reduce heat buildup, then rolling resistance decreases, but compatibility between rubber and silica must be improved
Solution Approach 1:
The patent changes the chemical parameters of the rubber matrix by incorporating vinyl compounds with functional groups (formula 1) that have affinity for silica surfaces, and adding siloxane compounds (formula 2) that bridge rubber and silica phases. These modifications improve interfacial compatibility, ensuring effective stress transfer and preventing filler aggregation while maintaining the low heat buildup benefits of silica reinforcement.
3Reliability
If wet grip is enhanced through rubber modification, then safety improves, but adhesion to rolls may increase
Solution Approach 1:
The patent applies local quality modification by introducing specific functional groups at strategic locations in the rubber molecule (vinyl compound units at chain ends and siloxane attachments) that provide polar interactions for wet grip enhancement, while the bulk rubber matrix maintains non-polar characteristics that prevent adhesion to rolls. This localized functional differentiation allows simultaneous achievement of high wet grip and low adhesion.
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 conjugated diene rubber effectively prevents adhesion to rolls, achieves excellent low heat buildup, enhances wet grip, and ensures high operation stability, thereby meeting the performance demands for advanced tire applications.
Implementation Method 1
a modifying structure derived from a siloxane compound is introduced to at least one end of a polymer chain
Implementation Method 2
a vinyl compound having a functional group interactive with silica
Implementation Method 3
monomer unit of a vinyl compound having a functional group interactive with silica
Data Source
AI summary
The present invention provides a modified conjugated diene rubber having a modifying structure derived from a siloxane compound at at least one terminal of a polymer chain containing conjugated diene monomer unit and a monomer unit of a vinyl compound having a functional group interactive with silica.