Diene Elastomer with Anthracenyl Groups for Simplified Crosslinking
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Solution Overview
Problem
The complexity of multi-component vulcanization systems in rubber compositions for tires complicates the manufacturing process, and there is a need for a simpler method to achieve medium deformation stiffness and reinforcement properties comparable to sulfur-vulcanized rubber compositions.
Innovation Solution
A diene elastomer with pendant anthracenyl units is used, which can be crosslinked using a single reagent, such as bismaleimide, to create a rubber composition with medium deformation stiffness and reinforcement properties comparable to conventional sulfur-vulcanized rubber compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a multi-component sulfur-based vulcanization system is used, then medium-strain stiffness and reinforcement properties are achieved, but the manufacturing process becomes complex
Solution Approach 1:
The invention extracts the essential crosslinking function from the complex multi-component sulfur vulcanization system and implements it through a single peroxide crosslinking agent. The peroxide directly decomposes to form radicals that crosslink the polymer chains, eliminating the need for multiple accelerators, activators, and retarders while maintaining the desired medium-strain stiffness properties
Solution Approach 2:
The invention changes the chemical mechanism parameter from sulfur-based crosslinking to peroxide-based crosslinking. This parameter change transforms the crosslinking reaction from a multi-step process requiring multiple components to a simpler single-step decomposition and crosslinking process, reducing manufacturing complexity while achieving comparable reinforcement properties
2Productivity
If a multi-component vulcanization system is used, then crosslinking efficiency is achieved, but the number of components and preparation stages increases
Solution Approach 1:
The invention extracts only the essential crosslinking function from the complex vulcanization system and implements it through peroxide decomposition. The peroxide directly generates radicals that initiate crosslinking without requiring accelerators or activators, reducing the number of components from multiple to one while maintaining crosslinking efficiency
Solution Approach 2:
The invention merges the functions of multiple vulcanization components (crosslinking agent, accelerator, activator) into a single peroxide crosslinking agent. The peroxide simultaneously provides the crosslinking function and the activation energy through its decomposition, eliminating the need for separate accelerator and activator components
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
This approach simplifies the crosslinking process while maintaining comparable medium deformation stiffness and reinforcement properties to traditional vulcanized rubber compositions, using a single crosslinking agent instead of a multi-component system.
Implementation Method 1
crosslink diene elastomers in a rubber compound to impart the desired elasticity, stiffness, and reinforcement properties
Implementation Method 2
vulcanize—that is, crosslink under the action of sulfur—diene elastomers in a rubber compound intended for use in a tire
Data Source
AI summary
The invention relates to a diene elastomer bearing optionally-substituted anthracenyl pendant groups outside its chain ends. The use of such an elastomer allows for a single cross-linking agent to be used in replacement of the multi-component cross-linking systems conventionally used in rubber compositions.