Vibration Isolation Rubber Composition for Reversion-Resistant Durability
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Solution Overview
Problem
Existing vibration isolation rubber compositions face challenges in maintaining durability while improving resistance to vulcanization reversion, as techniques to enhance resistance often lead to decreased durability due to roughening and densification of the crosslinked structure.
Innovation Solution
A vibration isolation rubber composition is developed by controlling the specific contents of a bismaleimide compound, a sulfenamide-based vulcanization accelerator, and a sulfur-based vulcanizing agent within specific ranges, along with controlling the mass ratio of the sulfenamide-based vulcanization accelerator to the sulfur-based vulcanizing agent within a specific range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If techniques to enhance resistance to vulcanization reversion are used (such as adding vulcanization reversion inhibitors), then resistance to vulcanization reversion is improved, but durability decreases due to roughening and densification of the crosslinked structure
Solution Approach 1:
The patent applies parameter changes by precisely controlling the content ratios of bismaleimide compound (0.6-5.5 parts by mass per 100 parts diene-based rubber), sulfenamide-based vulcanization accelerator (0.45-3.5 parts by mass), and sulfur-based vulcanizing agent (0.25-5.5 parts by mass), with the mass ratio of accelerator to vulcanizing agent maintained within 0.15-5.0. This optimized parameter combination achieves both high resistance to vulcanization reversion and high durability without the adverse effects of conventional inhibitor addition
2Reliability
If the crosslinked structure is roughened and densified to improve vulcanization reversion resistance, then resistance to vulcanization reversion is improved, but the durability of the rubber composition decreases
Solution Approach 1:
The patent employs composite material principles by combining multiple vulcanization systems (bismaleimide compound, sulfenamide-based accelerator, and sulfur-based vulcanizing agent) in specific proportions. This composite approach creates a balanced crosslinked structure that simultaneously provides resistance to vulcanization reversion and maintains durability, avoiding the extreme roughening and densification caused by single-system approaches
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 effectively suppresses the decrease in durability while enhancing resistance to vulcanization reversion, resulting in a vibration isolation rubber composition that maintains excellent performance in both aspects.
Implementation Method 1
a vibration isolation rubber composition, containing the following components (A) to (E) and being characterized in that, relative to 100 parts by mass of the component (A), a content of the component (B) is 0.6 to 5.5 parts by mass, a content of the component (C) is 0.45 to 3.5 parts by mass, a content of the component (D) is 0.25 to 5.5 parts by mass
Implementation Method 2
it is possible to provide a vibration isolation rubber composition that can suppress a decrease in durability while improving resistance to vulcanization reversion by controlling the respective contents of a bismaleimide compound, a sulfenamide-based vulcanization accelerator, and a sulfur-based vulcanizing agent
Data Source
AI summary
Provided are a vibration isolation rubber composition and a vibration isolation rubber member, which can suppress a decrease in durability while improving resistance to vulcanization reversion. The vibration isolation rubber composition contains components (A) to (E), and is characterized in that relative to 100 parts by mass of component (A), the content of component (B) is 0.6-5.5 parts by mass, the content of component (C) is 0.45-3.5 parts by mass, the content of component (D) is 0.25-5.5 parts by mass, and the mass ratio [(C)/(D)] of component (C) relative to component (D) is 0.15-5.0. (A) A diene-based rubber. (B) A bismaleimide compound. (C) A sulfenamide-based vulcanization accelerator. (D) A sulfur-based vulcanizing agent. (E) An inorganic filler.