Epoxide Diene Rubber Crosslinking for Better Tire Processability
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Solution Overview
Problem
Existing rubber compositions for tire manufacturing, particularly those using a vulcanization system, face challenges such as the scorching phenomenon, high viscosities, and difficulties in industrial processing, which affect their extensometry properties and overall performance.
Innovation Solution
A rubber composition comprising an elastomer matrix with diene elastomers having epoxide functions, a reinforcing filler, and a crosslinking system based on an organopolyphosphorus compound of general formula (I), which simplifies the crosslinking process and improves extensometry properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional vulcanization system (sulfur + accelerators) is used for crosslinking, then effective crosslinking is achieved, but the composition suffers from scorching phenomenon, high viscosity, and processing difficulties
Solution Approach 1:
The patent changes the chemical parameters of the crosslinking system by replacing sulfur-based vulcanization with organometallic catalysts (aluminum, zinc, magnesium, or boron compounds) combined with specific silane crosslinking agents. This parameter change eliminates the scorching phenomenon and reduces viscosity while maintaining effective crosslinking, as the organometallic system operates through a different chemical mechanism that does not produce premature crosslinking during processing.
Solution Approach 2:
The patent employs a simplified crosslinking system that eliminates the need for multiple additives (vulcanization accelerators, activators, and retardants) required by conventional sulfur systems. The organometallic catalyst system achieves crosslinking with fewer components, reducing complexity and improving processability while maintaining effectiveness.
2Device complexity
If a dicarboxylic acid crosslinking system is used, then preparation is simplified, but extensometry properties are insufficient
Solution Approach 1:
The patent changes the chemical nature of the crosslinking agent from dicarboxylic acid to organosilane compounds (such as tetraethyl orthosilicate, methyl trimethoxysilane, or dimethyl dichlorosilane) combined with organometallic catalysts. This parameter change in the crosslinking chemistry produces a crosslinked network with superior extensometry properties while maintaining simplified preparation, as the silane-based system cures through hydrolysis and condensation reactions facilitated by the organometallic catalyst.
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 simplifies the preparation process, enhances extensometry properties, and improves the high-strain endurance of tires, leading to a longer service life compared to compositions with a dicarboxylic acid crosslinking system.
Implementation Method 1
a system for crosslinking said polymer, comprising at least one organopolyphosphorus compound of general formula (I)
Data Source
AI summary
A rubber composition contains: an elastomer matrix comprising at least one diene elastomer comprising epoxide functions, at least one reinforcing filler, and a system for crosslinking the polymer, comprising at least one organopolyphosphorus compound of general formula (I)in which A represents a covalent bond or a hydrocarbon group comprising at least 1 carbon atom, which is optionally substituted and which optionally comprises one or more heteroatoms, and the Rs represent, independently of one another, a hydrocarbon group comprising at least 1 carbon atom or a hydrogen atom.