Epoxidized Diene Rubber Crosslinking Without Scorching
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Solution Overview
Problem
Conventional rubber compositions for tires, relying on vulcanization systems, face challenges such as premature vulcanization ('scorching') and high viscosities during preparation, making them difficult to work with industrially, and require complex formulations with sulfur, accelerators, and retarders.
Innovation Solution
A rubber composition featuring a diene elastomer with epoxy functions, a reinforcing filler, and a crosslinking system comprising an organopolyphosphorus compound, which simplifies preparation and enhances extensometry properties compared to traditional systems based on dicarboxylic acid crosslinking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional vulcanization system (sulfur + accelerators) is used for crosslinking, then crosslinking efficiency is achieved, but premature vulcanization (scorching) occurs during preparation and viscosity becomes too high
Solution Approach 1:
The patent extracts the harmful sulfur-based vulcanization system and replaces it with an organopolyphosphorus compound crosslinking system. This removal eliminates the toasting phenomenon and premature vulcanization while maintaining crosslinking efficiency, directly resolving the contradiction between crosslinking reliability and manufacturing ease.
Solution Approach 2:
The patent changes the chemical parameters of the crosslinking system by using organopolyphosphorus compounds with specific structural formulas (I) and (II) instead of sulfur-based systems. This parameter change modifies the reaction characteristics to prevent premature crosslinking during preparation while ensuring effective crosslinking in the final product.
2Reliability
If a vulcanization system with multiple components (sulfur, accelerators, activators, retarders) is used, then crosslinking control is improved, but composition complexity increases
Solution Approach 1:
The patent extracts and removes the complex multi-component vulcanization system (sulfur, accelerators, activators, retarders) and replaces it with a simplified organopolyphosphorus compound system. This extraction maintains crosslinking control through the specific molecular structure of the phosphorus compound while dramatically reducing composition complexity.
Solution Approach 2:
The organopolyphosphorus compound serves multiple functions simultaneously: it acts as the crosslinking agent, provides structural control through its molecular architecture (formulas I and II), and eliminates the need for separate accelerators and retarders. This multi-functionality resolves the contradiction by consolidating multiple roles into a single component.
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 composition achieves improved extensometry properties at both low and high temperatures, simplifying the manufacturing process and enhancing tire performance without the need for complex vulcanization systems, leading to better endurance and lifespan.
Implementation Method 1
a crosslinking system for said polymer comprising at least one organopolyphosphorus compound of general formula (I)
Data Source
AI summary
The invention relates to a rubber composition containing - an elastomeric 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 the general formula (I), wherein - A represents a covalent bond or a hydrocarbon group comprising at least 1 carbon atom which is optionally substituted, A optionally comprising one or more heteroatoms, and - R represents, independently of each other, a hydrocarbon group comprising at least 1 carbon atom or one hydrogen atom.